JP7304520B2 - lighting equipment - Google Patents

Description

The present disclosure relates to lighting devices.

2. Description of the Related Art Conventionally, there is one described in Patent Document 1 as a lighting. This illumination device includes a base, a light source module, a first cylindrical member, a second cylindrical member, a lens holder, and a lens. The base constitutes the upper side of the housing and has a plurality of fins on the side opposite to the light emitting side. Further, the light source module is fixed to the end face (principal face) of the base on the light emitting side, and emits light to the side opposite to the fin side in the optical axis direction. A 1st cylindrical member is fixed to a base so that relative movement is impossible. Further, the second cylindrical member is attached to the first cylindrical member so as to be relatively movable in the optical axis direction, and when rotated with respect to the first cylindrical member, the height position with respect to the first cylindrical member varies. The lens holder constitutes the lower side of the housing of the illumination device, and is fixed to the outside in the radial direction of the second cylindrical member so as not to move relative to it. Also, the lens is fixed inside the lens holder so as not to be relatively movable. The lens is positioned closer to the light exit side than the light source module in the optical axis direction. In this illumination device, by rotating the lens holder with respect to the base, the height position of the lens holder with respect to the base can be changed, and the optical axis direction position of the lens with respect to the light source module can be appropriately adjusted. Therefore, it is possible to adjust the tilt angle performance of the emitted light, increase the degree of freedom of light distribution control, and easily realize a desired light distribution.

Japanese Patent No. 6159460

In the lighting device described above, when trying to improve the narrow-angle characteristics (characteristics in which the lens narrows the light distribution area at a position away from the light source), the dropout of the emitted light (the phenomenon in which the central part of the illuminated area becomes dark) occurs. It tends to occur at a position in the optical axis direction of the medium angle region of the lens. On the other hand, if an attempt is made to suppress the occurrence of the drop in the middle of the lens, the narrow-angle characteristics tend to deteriorate. Furthermore, it is preferable that the light from the light source can be emitted to the irradiation area without loss.

Accordingly, it is an object of the present disclosure to provide a lighting device that facilitates achieving both excellent narrow-angle characteristics and suppressing the midpoint drop, and that easily emits light from a light source to an irradiation area without loss.

In order to solve the above problems, the lighting device according to the present disclosure includes a housing, a light source fixed in the housing and emitting light, a moving lens whose distance in the optical axis direction between the light source and the light source can be changed, and a moving lens. A narrow lens that suppresses a drop in the central portion of the irradiation surface of the irradiation light emitted from the lens, in which the illuminance is lower than that of the peripheral portion, and also suppresses a decrease in narrow-angle characteristics that reduces the area of the irradiation surface of the irradiation light. and corner drop improving means.

Further, a lighting device according to an embodiment of the present disclosure includes a housing, a light source fixed in the housing and emitting light, and a light source fixed in the housing and positioned on the light emission side in the optical axis direction of the light source. a fixed lens having a light emitting surface; and a moving lens having a light projecting surface arranged on the light emitting side in the optical axis direction of the fixed lens and having a variable distance from the light source in the optical axis direction. , the light incident surface of the fixed lens is substantially flat, while the light exit surface is convex, and the first projected area of the orthogonal projection of the fixed lens to a vertical plane perpendicular to the optical axis direction is It is greater than or equal to the second orthographic projection area. The optical axis direction is the direction of the optical axis of the fixed lens, and substantially coincides with the direction of the optical axis of the movable lens.

According to the lighting device according to the present disclosure, it is easy to achieve both excellent narrow-angle characteristics and suppression of midpoint drop, and it is easy to emit light from the light source to the irradiation area without loss.

1 is a perspective view of a lighting device according to a first embodiment of the present disclosure; FIG. It is a perspective view of the member for optical axis adjustment of the said illuminating device. It is an exploded perspective view of the principal part of the above-mentioned illuminating device. It is sectional drawing in the cross section containing an optical axis direction of the principal part of the said illuminating device. It is a perspective view when the fixed lens assembly attached to the housing|casing of the said illuminating device is seen from the lower side. It is a perspective view of the fixed lens of the said illuminating device. It is a perspective view of the lens attachment member of the said illuminating device. FIG. 4 is a perspective view showing the lens mounting member with a fixed lens mounted on the upper side; Fig. 2 is a perspective view of a fixed lens assembly of the lighting device; It is a perspective view when the fixed lens assembly from which the lens mounting member is removed is viewed from below. FIG. 11 is a perspective view of the fixed lens assembly with the fixed lens further removed from the state shown in FIG. 10 as viewed from below; It is a perspective view when the fixed lens assembly with the light source module removed is viewed from above. It is a perspective view when the board|substrate holder holding the light source module is seen from the upper side. FIG. 4 is a perspective view of an optical block composed of a lens holder and a moving lens held by it; It is a perspective view of the lens holder of the said illuminating device. 4 is a perspective view of a moving lens of the illumination device; FIG. It is a perspective view of the rotation member of the said illuminating device. FIG. 4 is a perspective view of a moving lens assembly configured by integrally integrating an optical block and a rotating member; It is a perspective view of the 1st member of the housing|casing of the said illuminating device. FIG. 2 is a perspective view of the lighting device when viewed from an angle different from that of FIG. 1; 4 is a schematic cross-sectional view for explaining dimensions of a light source, a fixed lens, and a moving lens; FIG. (a) is a schematic diagram showing light distribution at a narrow angle in the lighting device, and (b) is a lighting device of a reference example that differs from the lighting device only in that there is no fixed lens at a narrow angle. It is a schematic diagram showing light distribution at the time of a medium angle and at the time of a wide angle. Further, (c) is a schematic diagram showing light distribution at the time of narrow angle, medium angle, and wide angle in the lighting device. FIG. 10 is a perspective view of a lighting device according to a second embodiment of the present disclosure; FIG. 10 is an exploded perspective view of the main parts of the lighting device of the second embodiment; It is a perspective view when the housing|casing of the illuminating device of 2nd Embodiment is seen from a light-projection side. FIG. 11 is a perspective view of a fixed lens assembly of the illumination device of the second embodiment; 27 is a perspective view showing a state in which the fixed lens and the lens mounting member are removed from the fixed lens assembly shown in FIG. 26; FIG. FIG. 11 is a perspective view of a moving lens assembly of the illumination device of the second embodiment; It is a perspective view of a C-shaped snap ring of the lighting device of the second embodiment. It is a figure explaining the attachment structure of the rotation member with respect to the housing|casing in 2nd Embodiment. It is a perspective view when the fixed lens of the illuminating device of 2nd Embodiment is seen from the light-projection side of an optical axis direction. FIG. 10 is a schematic cross-sectional view showing a light source module and a fixed lens in a lighting device that can be produced; FIG. 11 is a perspective view of a lighting device according to a third embodiment of the present disclosure; It is a perspective view when the illuminating device of 3rd Embodiment is seen from another direction. FIG. 11 is an exploded perspective view of the main parts of the lighting device of the third embodiment; FIG. 11 is a perspective view of a moving lens assembly included in the illumination device of the third embodiment and assembled with a C-shaped retaining ring; FIG. 11 is a perspective view of a movable lens of the illumination device of the third embodiment when viewed from the light incident side; FIG. 11 is a perspective view of a movable lens of the illumination device of the third embodiment when viewed from the light exit side; FIG. 11 is a cross-sectional view of the moving lens of the illumination device of the third embodiment, taken along a plane passing through the optical axis; It is a perspective view when the housing|casing of the illuminating device of 3rd Embodiment is seen from an optical axis direction lower side. It is a perspective view of the lens holder of the lighting device of the third embodiment. FIG. 11 is a diagram for explaining a preferred dimensional relationship to be established with respect to a housing, a moving lens, and a lens holder in relation to the illumination device of the third embodiment; FIG. 11 is a perspective view of a lighting device according to a fourth embodiment of the present disclosure; FIG. 12 is an exploded perspective view of the main part of the main body in the lighting device of the fourth embodiment; FIG. 11 is a perspective view of a moving lens assembly included in the illumination device of the fourth embodiment and assembled with a C-shaped retaining ring; It is a perspective view when the moving lens of the illuminating device of 4th Embodiment is seen from an optical axis direction upper side. FIG. 12 is a perspective view of the lighting device of the fourth embodiment, when the state in which the inner member to which the light source module is fixed is being fixed to the outer cylinder member is viewed from below the outer cylinder member in the Z direction. It is a perspective view of the lens holder of the illuminating device of 4th Embodiment. FIG. 20 is a perspective view for explaining the relative position of the light source module with respect to the moving lens in relation to the illumination device of the fourth embodiment, and is a perspective view when the moving lens and the light source module are seen from diagonally below the moving lens. FIG. 14 is a perspective view for explaining the relative position of the light source module with respect to the moving lens in relation to the illumination device of the fourth embodiment, and is a plan view when the moving lens and the light source module are seen from above in the Z direction.

Embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that the characteristic portions thereof will be appropriately combined to construct a new embodiment. Further, in the following embodiments, the same reference numerals are given to the same configurations in the drawings, and redundant explanations are omitted. In addition, the dimensional ratios of length, width, height, etc. of each member do not necessarily match between different drawings. Further, in the drawings and the following description, the R direction is the radial direction of the bodies 41 and 141 of the fixed lenses 40 and 148 described below, and the θ direction is the circumference of the bodies 41 and 141 of the fixed lenses 40 and 148. is the direction. The Z direction is the direction of the optical axes of fixed lenses 40 and 148 described below, coincides with the height direction of housings 10 and 130, and is the extending direction of the central axes of movable lenses 60 and 163, that is, , and the directions of the optical axes of the moving lenses 60 and 163 as well. The R direction, θ direction, and Z direction are orthogonal to each other.

Further, in the following description, the upper side refers to the side opposite to the light emission side in the optical axis direction, and the lower side refers to the light emission side in the optical axis direction. In addition, the inclined groove described below has a structure having a pair of inner wall surfaces that are inclined with respect to the Z direction and face each other, and at least a part of the fitting portion positioned between the pair of inner wall surfaces is a pair of grooves. It is defined as a structure that allows the fitting portion to move along the extending direction of the pair of inner wall surfaces by being guided by the inner wall surfaces of the pair of inner wall surfaces. Therefore, although the inclined groove may have a structure with a bottom portion, it has a structure of a through-hole having an elongated elongated hole shape inclined with respect to the optical axis direction, like the inclined groove 81 described below, and rotates. You may penetrate the side wall of a member or an optical block in a thickness direction. In addition, among the constituent elements described below, constituent elements that are not described in independent claims indicating the highest concept are optional constituent elements and are not essential constituent elements. Also, in this specification, when the word "abbreviated" is used, it is used with the same meaning as the word "roughly speaking", and the requirement of "abbreviated ~" means that if a person roughly looks like ~ It is filled. For example, the nearly circular requirement is met if a person appears roughly circular.

(First embodiment)
FIG. 1 is a perspective view of a lighting device 1 according to the first embodiment of the present disclosure. As shown in FIG. 1, the illumination device 1 is a recessed universal downlight, which is embedded in the ceiling of a building such as a hall, and can change the optical axis direction of downwardly emitted light. More specifically, as shown in FIG. 1, lighting device 1 includes housing 10 . The housing 10 has a bottomed tubular portion 11 . The housing 10 functions as a mounting base for mounting the light source 22 (see FIGS. 4 and 11) inside the bottomed cylindrical portion 11 and is stationary with respect to the light source 22 . The housing 10 has a plurality of fins 12 protruding upward, and the entire housing also functions as a heat sink that dissipates heat generated by the light source 22. In particular, the fins 12 dissipate heat from the light source 22 to the outside. do. Therefore, it is preferable that the housing 10 is made of a material with high thermal conductivity such as a metal material. The housing 10 is configured by integrally molding the bottomed tubular portion 11 and the fins 12 with, for example, aluminum die-casting. In addition, the structure which joins a bottomed cylindrical part and a fin may be sufficient as a housing|casing. In this case, for example, the bottomed tubular portion and the fins may be connected by plastically deforming the protrusions provided on the bottomed tubular portion after being inserted into the holes provided in the fins. Note that the housing may not have fins.

The illumination device 1 further includes a spring mounting member 15 , an optical axis adjusting member 17 and a frame 20 . Each of the spring mounting member 15, the optical axis adjusting member 17, and the frame 20 is preferably made of a metal material such as aluminum or a resin material such as polybutylene terephthalate. The housing 10, the spring mounting member 15, the optical axis adjusting member 17, and the frame 20 are integrated as follows. Specifically, as shown in FIG. 1, the spring mounting member 15 includes an annular flat plate portion 15a and three spring mounting portions 15b. It protrudes downward from the annular flat plate portion 15a in a state where the The frame 20 is a cylindrical member and includes an annular disk-shaped upper end surface (not shown). As shown in FIG. 2, that is, a perspective view of the optical axis adjusting member 17, the optical axis adjusting member 17 includes an annular flat plate portion 17a, an upper housing fixing portion 17b, and a lower housing fixing portion 17c. The upper housing fixing portion 17b protrudes upward from the annular flat plate portion 17a, while the lower housing fixing portion 17c protrudes downward from the annular flat plate portion 17a.

Again referring to FIG. 1, the annular flat plate portion 15a of the spring mounting member 15 and the upper end face of the frame 20 sandwich the annular flat plate portion 17a of the optical axis adjusting member 17, and the annular flat plate portion 15a is mounted on the frame. It is fixed with a screw 23 to the upper end face of the body 20 . By this fixation, the spring mounting member 15, the optical axis adjusting member 17, and the frame 20 are integrated. As shown in FIG. 2, the upper housing fixing portion 17b has an elongated hole 17d, and the lower housing fixing portion 17c has a cylindrical hole 17e. Referring to FIG. 1, the optical axis adjusting member 17 is screwed to the housing 10 with a screw 16 using a long hole 17d and screwed into the housing 10 with a screw (not shown) using a cylindrical hole 17e (see FIG. 2). 10 is screwed.

The lighting device 1 further comprises three mounting springs 28 . The three mounting springs 28 are arranged at approximately equal intervals in the θ direction, and each mounting spring 28 is fixed to the spring mounting portion 15b. The mounting spring 28 is made of, for example, a metal plate having a bent portion, and has a plate spring structure. By distorting the mounting spring 28, the mounting spring 28 is displaced so that the root side portion 28a of the mounting spring 28 extends along the periphery of the embedding hole in the height direction of the embedding hole, and at least part of the root side portion 28a is displaced. presses the inner peripheral surface of the embedding hole radially outward. Then, the stationary portion 28b located on the tip side of the root side portion 28a extends radially outward from the embedding hole and rests in the ceiling space along the ceiling space. In this manner, the mounting spring 28 is fixed around the embedding hole. As described above, the spring attachment portion 15b is fixed to the frame 20. As shown in FIG. Therefore, the frame 20 is fixed around the embedding hole. Since the mounting spring 28 is attached to the frame 20, it rests against the frame 20 and also rests in the embedded hole in the ceiling. Two or four or more mounting springs may be provided. Moreover, the structure for mounting the lighting device on the ceiling may be any structure as long as it is capable of fixing the lighting device to the ceiling, and does not need to include a mounting spring.

As shown in FIG. 1, when the extending direction of the central axis of the frame body 20 substantially coincides with the Z direction, the housing 10 is fixed to the right end of the long hole 17d on the paper surface with the screws 16. As shown in FIG. With the frame 20 fixed to the embedding hole using the mounting spring 28, the user applies a force greater than the static friction force generated due to the tightening force of the screw 16 to the upper housing fixing portion 17b to the housing 10. Suppose you gave Then, the housing 10 is moved to the left side in FIG. 1 so that the screw 16 moves to the left in FIG. It rotates with respect to member 17 . In other words, the optical axis adjusting member 17 is fixed to the frame 20 so as not to move relative to it, so that the housing 10 is tilted with respect to the frame 20 .

Therefore, after the lighting device 1 is fixed in the embedding hole, the user can adjust the housing 10 so that the housing 10 is inclined at a desired angle with respect to the frame 20, and the light source 22 fixed to the housing 10 (Figs. 11) (substantially coincides with the optical axis of the fixed lens 40 to be described later) can be tilted at a desired angle with respect to the vertical direction. Therefore, the degree of freedom of the irradiation area can be significantly increased. Although the case where the lighting device 1 is a universal downlight whose optical axis direction can be adjusted in the vertical direction has been described, the lighting device may have a configuration in which the optical axis direction in the vertical direction cannot be adjusted.

FIG. 3 is an exploded perspective view of the main parts of the lighting device 1, and FIG. 4 is a cross-sectional view of the main parts along a cutting plane including the Z direction. As shown in FIG. 3, the illumination device 1 includes a housing 10, a light source module 25, a substrate holder 30, a fixed lens 40, a holder fixing member 42, a lens mounting member 45 (see FIG. 7), a moving lens 60, and an annular lens. A holder 70 and an annular rotating member 80 are provided. The substrate holder 30 holds the substrate 21 of the light source module 25, and the holder fixing member 42 is used to fix the substrate holder 30 to the upper end surface (main surface) inside the housing. Also, the lens mounting member 45 is used to mount the fixed lens 40 arranged on the lower side of the substrate 21 to the substrate holder 30 , and the lens holder 70 holds the movable lens 60 . The rotating member 80 has a substantially cylindrical shape and functions to move the lens holder 70 with respect to the housing 10 in the optical axis direction.

As shown in FIG. 4 , the fixed lens 40 is arranged below the light source module 25 and the moving lens 60 is arranged below the fixed lens 40 . More precisely, the light exit surface 88 of the fixed lens 40 (the end surface on the light exit side in the Z direction) is arranged on the light exit side in the Z direction (lower in the Z direction) than the light source module 25, A light projecting surface (an end face on the light emitting side in the Z direction) 87 is arranged on the light emitting side in the Z direction (lower in the Z direction) than the fixed lens 40 . Further, the lens holder 70 is arranged on the outer diameter side of the movable lens 60 so as to surround the movable lens 60 , and the rotary member 80 is arranged on the outer diameter side of the lens holder 70 so as to surround the lens holder 70 .

As shown in FIG. 4, the light incident surface 86 of the fixed lens 40 is substantially flat and extends in a direction substantially orthogonal to the Z direction. On the other hand, the light exit surface 88 of the fixed lens 40 is convex downward in the Z direction. The main body 41 of the fixed lens 40 and the moving lens 60 are each made of translucent material. More specifically, in this embodiment, the main body 41 of the fixed lens 40 is made of transparent silicone resin, and the moving lens 60 is made of transparent resin such as acrylic or polycarbonate, or a glass material. The main body of the fixed lens and the moving lens may each be made of a transparent resin material such as acrylic, polycarbonate, or silicone, or a glass material.

As shown in FIG. 4 , rotating member 80 has an inner peripheral surface 85 arranged to surround moving lens 60 . The entire inner peripheral surface 85 constitutes a low reflectance inner surface portion. Specifically, the rotating member 80 is made of colored, preferably black, resin, or the inner peripheral surface 85 of the rotating member 80 is painted colored, particularly preferably black. . Therefore, the light reflectance of the inner peripheral surface 85 is 15% or less. The light reflectance of the inner peripheral surface 85 is preferably 10% or less, more preferably 5% or less, and most preferably 0%.

With this configuration, light is less likely to be reflected by the inner peripheral surface 85 and can be absorbed by the inner peripheral surface 85 . Therefore, glare when a person looks up at the lighting device 1 can be reduced. The case where the entire inner peripheral surface 85 constitutes the low reflectance inner surface portion and the light reflectance of the entire inner peripheral surface 85 is 15% or less has been described. may not be 15% or less in all. Specifically, the inner peripheral surface surrounding the movable lens has a low reflectance inner surface portion having a light reflectance of 15% or less, which is located on the light emission side of the position where the movable lens has moved most toward the light source in the Z direction. should contain Alternatively, the light reflectance may be greater than 15% on the entire inner peripheral surface.

FIG. 5 is a perspective view of the fixed lens assembly 90 attached to the housing 10 as viewed from below. The light source module (see FIG. 3) 25, substrate holder 30, fixed lens 40, holder fixing member 42, and lens mounting member 45 are integrated and integrated. Fixed lens assembly 90 includes its integrated structure. Below, first, the structure of the fixed lens assembly 90 will be described, and the fixing structure of the fixed lens assembly 90 to the housing 10 will also be described.

6 is a perspective view of the fixed lens 40, and FIG. 7 is a perspective view of the lens mounting member 45. FIG. 8 is a perspective view of the lens mounting member 45 with the fixed lens 40 mounted thereon, and FIG. 9 is a perspective view of the fixed lens assembly 90. As shown in FIG. As shown in FIG. 6, the fixed lens 40 has a main body 41 and a pair of holding portions 53,54. The fixed lens 40 is formed by two-color molding, for example, and the main body 41 and the pair of holding portions 53 and 54 are formed of different materials. The transmittance of the main body 41 is higher than the transmittance of the pair of holding portions 53 and 54 . As described above, in this embodiment, the main body 41 of the fixed lens 40 is made of transparent silicone resin, but the holding portions 53 and 54 of the fixed lens 40 are made of transparent or non-transparent silicone resin. and preferred. The holding portions 53 and 54 of the fixed lens 40 may be made of transparent resin material such as acrylic, polycarbonate, or silicone, non-transparent resin material, or glass material. Also, the main body 41 and the pair of holding portions 53 and 54 may be made of the same transparent material and may have the same transmittance.

The main body 41 has a substantially circular shape in plan view when viewed in the optical axis direction. The main body 41 has the above-described substantially planar light entrance surface 86 and the above-described light exit surface 88 (see FIG. 4) that is convex downward in the Z direction, and further has a conical outer peripheral surface 63 . The light incident surface 86 is configured by a substantially circular plane, and the extending direction of the central axis of the conical outer peripheral surface 63 substantially coincides with the Z direction. On the other hand, the pair of holding portions 53 and 54 are arranged opposite to each other in the R direction so as to sandwich the central axis of the main body 41 , and each holding portion 53 and 54 extends outward in the R direction from the conical outer peripheral surface 63 . Each retaining portion 53 , 54 protrudes radially from the first edge 41 a of the main body 41 , more specifically from the first edge 41 a of the conical outer peripheral surface 63 . One holding portion 53 has a first radially extending portion 55 radially protruding from the first edge portion 41 a of the main body 41 and a first L-shaped portion 56 . The first L-shaped portion 56 includes a first orthogonally extending portion 56a extending in an orthogonal direction orthogonal to the first radially extending portion 55 from the distal end portion of the first radially extending portion 55, and a first radially extending portion 56a. A second radially extending portion 56b extending substantially parallel to the first radially extending portion 55 is included from the end of the orthogonally extending portion 56a on the side opposite to the first radially extending portion 55 side. A first through hole 56c is provided in the second radially extending portion 56b.

Similarly, the other holding portion 54 extends radially from the second edge portion 41b facing the first edge portion 41a of the main body 41 in the R direction, more specifically, from the second edge portion 41b of the conical outer peripheral surface 63. protrude. The other holding portion 54 has a third radially extending portion 57 radially protruding from the second edge portion 41 b and a second L-shaped portion 58 . The second L-shaped portion 58 includes a second orthogonally extending portion 58a extending from the tip of the third radially extending portion 57 in a direction orthogonal to the third radially extending portion 57, and a second orthogonally extending portion 58a. A fourth radially extending portion 58 b that extends substantially parallel to the third radially extending portion 57 from the distal end of the extending portion 58 a on the opposite side of the third radially extending portion 57 is included. A second through hole 58c is provided in the fourth radially extending portion 58b. The first radially extending portion 55 and the third radially extending portion 57 are positioned on the same first straight line passing through the center of the main body 41 in plan view when viewed in the Z direction. A second straight line connecting the center of the first through-hole 56c and the center of the second through-hole 58c in plan view when viewed in the Z direction passes through the center of the main body 41 and is inclined to the first straight line. .

As shown in FIG. 7, the lens mounting member 45 has a plane-symmetrical structure and includes a ring portion 50, two lens support portions 51, and two holder locking portions 52. As shown in FIG. The lens support portion 51 has a concave portion 59 that protrudes radially outward from the ring portion 50 and is open on both sides in the R direction and on the upper side in the Z direction. In addition, the lens support portion 51 has a flat portion 51a located on the same plane as the bottom surface 59a of the concave portion 59. As shown in FIG. Further, the holder locking portion 52 protrudes outward in the R direction from the end face of the lens support portion 51 on the outer side in the R direction. The length a of the concave portion 59 in the orthogonal direction perpendicular to both the R direction and the Z direction is equal to the first radially extending portion 55 of the holding portion 53 (see FIG. 6) (the third radially extending portion 57) is larger than the width b.

Each holder locking portion 52 includes a first flat plate portion 46 extending in a direction perpendicular to the Z direction, and a second flat plate portion 47 extending upward in the Z direction from the outer end of the first flat plate portion 46 in the R direction. have. The first flat plate portion 46 is provided with a through-hole 66 passing therethrough in the Z direction. A pair of columnar portions 64 a and 64 b protrude upward in the Z direction from both sides of the through hole 66 in the first flat plate portion 46 in the orthogonal direction. On the other hand, the second flat plate portion 47 has a recess 48 that communicates with the through hole 66 and opens downward in the Z direction. The bottom surface of the concave portion 48 is a locking end surface 65 facing downward in the Z direction.

As shown in FIG. 8, the first and third radially extending portions 55, 57 pass through the recess 59. As shown in FIG. Further, portions of the holding portions 53 and 54 on the main body 41 side are placed on the flat portion 51a. As described above, in the holding portions 53 and 54, the portions connected to the outer ends in the R direction of the first and third radially extending portions 55 and 57 are L-shaped. As a result, when viewed from the Z direction in the state shown in FIG.

FIG. 10 is a perspective view of the fixed lens assembly 90 with the lens mounting member 45 removed, as viewed from below. As shown in FIGS. 9 and 10, the substrate holder 30 has a pair of cylindrical protrusions 31a and 31b that protrude downward and are inserted into the first and second through holes 56c and 58c. Further, as shown in FIG. 9, the substrate holder 30 has a locking portion 34 extending downward. After the fixed lens 40 is placed on the lens mounting member 45 and is in the state shown in FIG. As shown in FIG. 9, the locking portion 34 of the substrate holder 30 is accommodated in the through hole 66 while being positioned by the pair of columnar portions 64a and 64b (see FIG. 7). is locked to the locking end surface 65 . Thereby, the substrate holder 30, the fixed lens 40, and the lens mounting member 45 are integrally integrated. As shown in FIG. 5, the ring portion 50 of the lens mounting member 45 is located outside the main body 41 of the fixed lens 40 in the R direction when the integrated structure is formed.

Next, the holding of the light source module 25 in the fixed lens assembly 90 and the fixing of the fixed lens assembly 90 to the housing 10 will be described. FIG. 11 is a perspective view of the fixed lens assembly 90 with the fixed lens 40 further removed from the state shown in FIG. 10, viewed from below. 12 is a top perspective view of the fixed lens assembly 90 from which the light source module 25 (see FIG. 11) has been removed, and FIG. 13 is a top view of the substrate holder 30 holding the light source module 25. 1 is a perspective view of a state in which it is folded.

As shown in FIG. 10, when the lens mounting member 45 is removed from the fixed lens assembly 90, the fixed lens 40 is exposed to the outside. The body 41 of the fixed lens 40 has a light exit surface 88 which is a convex surface as described above. As shown in FIGS. 4 and 10, the light exit surface 88 has an annular tapered surface portion 88a that tapers downward in the Z direction at the peripheral portion in the radial direction, and a substantially circular tapered surface portion 88a at the central portion in the radial direction. flat portion 88b. Furthermore, as shown in FIG. 11, when the lens mounting member 45 and the fixed lens 40 are removed from the fixed lens assembly 90, the light source 22 is exposed to the outside. Referring to FIG. 11, light source module 25 has substrate 21 and light source 22 . The substrate 21 has a flat plate shape that is substantially rectangular in plan view. The light source 22 has a disk-like shape and is arranged substantially in the center of the lower surface (mounting surface) of the substrate 21 . The light source module 25 has, for example, a COB (Chip On Board) structure, and the light source 22 includes a plurality of LEDs (light emitting diodes) mounted on the substrate 21 and a sealing member that seals the plurality of LEDs. .

The substrate 21 is composed of, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like. Although not described in detail, the substrate 21 is formed with a pair of electrode terminals and a predetermined pattern of metal wiring. A pair of electrode terminals is provided for externally receiving DC power for causing the LED to emit light. Moreover, the metal wiring of a predetermined pattern is provided for electrically connecting the LEDs.

The LED is composed of, for example, a bare chip that emits monochromatic visible light, and is composed of a blue LED chip that emits blue light when energized. A plurality of LEDs are arranged in a matrix on the substrate 21, for example. Note that only one LED may be mounted on the substrate. The sealing member is made of, for example, translucent resin and contains a phosphor. The phosphor serves to wavelength convert the light from the LED. The sealing member is made of, for example, phosphor-containing resin in which phosphor particles are dispersed in silicone resin. If the light source module 25 emits white light and the LED is a blue LED chip that emits blue light, the phosphor particles are made of, for example, a YAG-based yellow phosphor.

The sealing member may seal all the LEDs collectively, may seal a plurality of LEDs in a line for each row, or may seal each LED individually. . Also, the light source may include a light-emitting element other than the LED, and may be composed of a solid-state light-emitting element such as a semiconductor laser element, an organic EL (Electro Luminescence) element, or an inorganic EL element. Alternatively, the light source may be composed of an incandescent lamp, a fluorescent lamp, or the like.

As shown in FIG. 11, two holder fixing members 42 are arranged below the substrate holder 30 with a gap in the longitudinal direction of the substrate holder 30 . The holder fixing member 42 has a mounting hole 43 which overlaps with the mounting hole 39 (see FIG. 12) of the substrate holder 30 when viewed in the Z direction, and which is located on the main surface 18 of the housing 10 (see FIG. 12). 5) is also overlapped with a threaded hole (not shown). As shown in FIG. 12, the substrate holder 30 has a substantially rectangular through hole 37 in plan view. When the holder fixing member 42 is placed at a predetermined position with respect to the substrate holder 30, the substrate receiving portion 42a forming part of the holder fixing member 42 overlaps the through hole 37 when viewed from the Z direction. The substrate holder 30 and the holder fixing member 42 define the substrate accommodation chamber 27 .

As shown in FIG. 13, the light source module 25 is housed in the board housing chamber 27 (see FIG. 11) with the light source 22 directed downward. With the light source module 25 accommodated in the substrate accommodation chamber 27, a portion of the lower surface of the substrate 21 contacts the substrate receiving portion 42a (see FIG. 12). Furthermore, the substrate holder 30 accommodating the substrate 21 in the substrate accommodation chamber 27 is integrally integrated with the fixed lens 40 and the lens mounting member 45 as described above. After that, bolts (not shown) are inserted into the mounting hole 43 of the holder fixing member 42 (see FIG. 11), the mounting hole 39 of the substrate holder 30 (see FIG. 12), and the main surface 18 of the housing 10 (see FIG. 5) from below. ) in a screw hole (not shown). This tightening fixes the fixed lens assembly 90 (see FIG. 9) to the main surface 18 of the housing 10 .

Referring to FIG. 4 again, with the fixed lens assembly 90 fixed to the main surface 18, the tip surface 29 of the disk-shaped resin mold portion of the light source 22 faces the plane of the fixed lens 40 with a slight gap therebetween. facing the light incident surface 86 in the Z direction. In this way, the light emitted from the light source 22 that does not enter the fixed lens 40 is reduced, and the fixture efficiency, that is, the ratio of the light emitted from the light source 22 to the outside of the lighting device 1 is reduced. making it bigger. Note that the Z-direction position of the disk-shaped resin molded portion of the light source 22 on the tip face 29 is aligned with the Z-direction position of the flat light incident surface 86 of the fixed lens 40, and the tip face 29 of the light source 22 is mounted. may contact the light entrance surface 86 of the fixed lens 40, resulting in even higher instrument efficiency.

Further, as described above, the fixed lens 40 is made of silicone resin, and is made of a material containing silicone, which has excellent heat resistance. In this way, since the tip surface 29 of the light source 22 is positioned near the light incident surface 86 of the fixed lens 40, even if the fixed lens 40 becomes hot due to the heat from the light source 22, the fixed lens 40 is heated. Suppresses or prevents deterioration.

Furthermore, the fixed lens 40 has a Shore A hardness (JISK6253:2012) of 50 to 90 and has great elasticity. More specifically, the fixed lens 40 is made of, for example, a rubber elastic body made of a silicone material. By arranging the tip surface 29 of the light source 22 in the vicinity of the light incident surface 86 of the fixed lens 40 in this way, the fixed lens 40 becomes hot due to the heat from the LED and thermally expands, causing the light source 22 to The elasticity of the fixed lens 40 absorbs the increase in volume due to the thermal expansion of the fixed lens 40 even if the fixed lens 40 comes into contact with the resin mold portion of the . Excessive stress is prevented from acting on the resin mold portion and fixed lens 40 that are in contact with each other, thereby suppressing or preventing damage to the resin mold portion and fixed lens 40 . Therefore, the illuminating device 1 has two functions and effects that are in a mutually trade-off relationship (reciprocal relationship), that is, the function and effect that stray light is small and the efficiency of the device is excellent, and damage to the resin mold portion and the fixed lens 40 is prevented. At the same time, it is possible to achieve the action and effect of being able to suppress it, and it is possible to realize a remarkable action and effect.

When the tip surface 29 of the light source 22 is in contact with the light incident surface 86 of the fixed lens 40 and the distance in the Z direction between the light source 22 and the light incident surface 86 is 0 mm, the efficiency of the device can be maximized, which is preferable. However, if the distance in the Z direction between the light source 22 and the light incident surface 86 is 1.5 mm or less, the efficiency of the fixture can be increased as in the present embodiment. The directional distance may be set to 1.3 mm or less, 1.0 mm or less, 0.7 mm or less, or 0.5 mm or less. When the distance in the Z direction between the light source 22 and the light incident surface 86 is 0 mm, the distance in the Z direction between the light source 22 and the light incident surface 86 is set to 1 mm. A case where the distance is 0 mm is also included.

Furthermore, in this embodiment, the transmittance of the main body 41 of the fixed lens 40 is higher than the transmittance of the moving lens 60 . Also, the refractive index of the fixed lens 40 is smaller than the refractive index of the moving lens 60 . Here, when the fixed lens 40 has the main body 41 and the pair of holding portions 53 and 54 as in this embodiment, the refractive index of the fixed lens 40 is smaller than that of the moving lens 60 . The requirement is met if the refractive index of body 41 of fixed lens 40 is less than that of moving lens 60 . More precisely, in the present disclosure, the requirement that the refractive index of the fixed lens is smaller than the refractive index of the moving lens is the refractive index is satisfied if the planar view of the moving lens when viewed in the Z direction is smaller than the refractive index of the substantially circular portion. When the fixed lens 40 has the shape described in this embodiment, the refractive index of the main body 41 of the fixed lens 40 is smaller than the refractive index of the moving lens 60, and the holding portion of the fixed lens 40 The refractive index of 53, 54 may also be less than the refractive index of moving lens 60, or while the refractive index of body 41 of fixed lens 40 is less than that of moving lens 60, The refractive index of the holding portions 53 and 54 of the fixed lens 40 may be greater than or equal to that of the moving lens 60 . Also, the fixed lens may have a shape different from that of this embodiment, and may not have a holding portion. may consist of only If the fixed lens 40 is entirely made of transparent silicone resin and the moving lens 60 is made of a transparent resin such as acrylic or polycarbonate or a glass material, the refractive index of the fixed lens 40 is smaller than that of the moving lens 60. configuration can be easily realized. According to this configuration, the traveling direction of the light incident on the fixed lens 40 is less likely to change. Therefore, it is possible to suppress the light incident on the fixed lens 40 from going around to the holding portions 53 and 54 (see FIG. 6) and becoming stray light within the illumination device 1, and the efficiency of the fixture can be increased, resulting in bright illumination light. can be realized.

Further, in this embodiment, the arithmetic mean roughness of the light entrance surface 86 is smaller than the arithmetic mean roughness of the light exit surface 88 . LEDs have the property that the color of light around the optical axis tends to differ from the color of light around the periphery. For example, in the case of a white LED, the color of light around the optical axis is close to the desired white , the light on the peripheral side tends to be yellowish. Therefore, when the light source is an LED, color unevenness is likely to occur in the illumination light unless any countermeasures are taken.

In contrast, in the present embodiment, the arithmetic mean roughness of the light entrance surface 86 is smaller than the arithmetic mean roughness of the light exit surface 88, so that the light incident on the light entrance surface 86 can be easily controlled. Not only is it easy to efficiently guide the light to the exit surface 88 side, but it is also easy to mix the light emitted from the light exit surface 88 so that the light can be mixed. Therefore, it is possible to suppress color unevenness in each irradiation area of the irradiation light, and realize beautiful illumination light.

Next, a structure that allows the moving lens 60 (see FIG. 3) to move in the Z direction will be described. 14 is a perspective view of the optical block 95 composed of the lens holder 70 and the movable lens 60 held therein, FIG. 15 is a perspective view of the lens holder 70, and FIG. It is a perspective view. As shown in FIG. 14, the lens holder 70 is an annular member and is arranged to surround the moving lens 60 . The lens holder 70 is preferably made of a metal material such as aluminum or a resin material such as polybutylene terephthalate.

As shown in FIG. 15, the lens holder 70 has three engaging portions 71 arranged at intervals in the circumferential direction, and each engaging portion 71 extends in the Z direction. The engaging portion 71 includes a concave surface 71a convex inward in the R direction, the concave surface 71a faces outward in the R direction and extends in the Z direction. The role of the locking portion 71 will be described later. Further, the lens holder 70 has three lens fitting portions 73, and the three lens fitting portions 73 are arranged at approximately equal intervals in the θ direction and arranged on the inner peripheral side. The lens fitting portion 73 is composed of a protruding portion that protrudes inward in the R direction. As shown in FIG. 16, the moving lens 60 has a shape that widens toward the lower side in the Z direction. The moving lens 60 has three holder fitting portions 61 arranged at approximately equal intervals in the θ direction at the lower end portion on the outer peripheral side. The holder fitting portion 61 has a shape corresponding to the shape of the lens fitting portion 73 (see FIG. 15), and is configured by a recess recessed inward in the R direction. By press-fitting the lens fitting portion 73 into the holder fitting portion 61, the movable lens 60 is fixed to the lens holder 70, and as a result, an optical block 95 shown in FIG. 14 is constructed.

Next, an integrated structure that allows relative movement of the optical block 95 with respect to the rotating member 80 will be described. As shown in FIG. 15, the lens holder 70 has two fitting claws 78 on the outer peripheral side. The fitting claw 78 is an example of a fitting portion. The two fitting claws 78 are arranged to face each other in the R direction, and each fitting claw 78 has a plate shape with a pair of inclined surfaces 78a and 78b. Each inclined surface 78a, 78b extends in a direction inclined with respect to the Z direction.

17 is a perspective view of the rotating member 80. FIG. As shown in FIG. 17, the rotating member 80 is a substantially cylindrical member and has two inclined grooves 81 spaced apart in the θ direction. The slanted groove 81 has a shape consisting of a part of a spiral groove. The inclined groove 81 is inclined with respect to the Z direction and extends from the lower side in the Z direction of the rotating member 80 to the upper side in the Z direction toward one side in the θ direction. The inclined groove 81 has a structure of an elongated long hole-shaped through-hole that penetrates the rotating member 80 in the thickness direction, and includes a pair of inner wall surfaces (inclined surfaces) 81a and 81b that face each other in the Z direction.

As shown in FIG. 18, the optical block 95 and the rotating member 80 are integrated by fitting the fitting claws 78 protruding outward in the R direction of the optical block 95 into the inclined grooves 81 of the rotating member 80 . , a moving lens assembly 75 is constructed. The fitting claw 78 is movable in the inclined groove 81 in the extending direction of the inclined groove 81 . When the optical block 95 rotates relative to the rotary member 80 in the direction indicated by θ1 in FIG. 18 from the state shown in FIG. 18, the movable lens 60 moves upward in the Z direction with respect to the rotary member 80 . By adjusting the position of the fitting claw 78 in the inclined groove 81 in this way, the Z-direction position of the moving lens 60 with respect to the rotating member 80 can be adjusted.

Next, a mounting structure of the movable lens assembly 75 to the housing 10 will be described. As shown in FIG. 3, the housing 10 has a two-part structure and includes a first member 10a and a second member 10b. 19 is a perspective view of the first member 10a of the housing 10. FIG. As shown in FIG. 19, the housing 10 has a plurality of columnar portions (ribs) 97 extending downward in the Z direction from the main surface 18 side. The columnar portion 97 is provided on a stationary portion that is stationary with respect to the light source 22 . A tip surface of the columnar portion 97 is a convex surface 97a that is convex inward in the R direction. In this embodiment, the first member 10a shown in FIG. 19 has two columnar portions 97, and the second member 10b (see FIG. 3) has one columnar portion (not shown).

The convex surfaces 97a of the three columnar portions 97 are engaged with the concave surfaces 71a (see FIG. 18) of the three engaging portions 71 of the lens holder 70 included in the movable lens assembly 75. As shown in FIG. Furthermore, as shown in FIG. 20, that is, a perspective view of the illumination device 1 when viewed from a different angle from that of FIG. is attached rotatably relative to the housing 10 in a state where the Z-direction position relative to the housing 10 is almost unchanged. This attachment integrates the moving lens assembly 75 with the housing 10 .

More specifically, attachment of the rotating member 80 to the housing 10 is performed as follows. As shown in FIG. 4, the rotating member 80 has a first annular flange portion 35 and a second annular flange portion 36 located below it in the Z direction. An annular groove 38 is provided between the . Further, the housing 10 has an annular projecting portion 13 projecting downward in the Z direction and inward in the R direction. The first member 10a and the second member 10b are integrated so that the annular projection 13 is received within the annular groove 38 when the housing 10 and moving lens assembly 75 are integrated. When viewed from the Z direction, the first annular flange portion 35 has a portion that overlaps the annular projecting portion 13, and the annular end face 14 located on the lower side in the Z direction in the housing 10 overlaps the second annular flange portion 36. have a part. As shown in FIG. 4, in a state in which the lower surface of the first annular flange portion 35 is in contact with the upper surface of the annular projecting portion 13, the annular end surface 14 is attached to the upper surface of the second annular flange portion 36 with a slight gap therebetween. Oppose in the Z direction. The downward movement of the rotating member 80 relative to the housing 10 is restricted by the annular protrusion 13 , and the upward movement of the rotating member 80 relative to the housing 10 is restricted by the annular end surface 14 of the housing 10 . As a result, the rotary member 80 can rotate relative to the housing 10 in a state where the Z-direction position does not substantially change with respect to the housing 10 . Since the slight gap is present, the rotating member 80 can be smoothly rotated with respect to the housing 10 . The Z-direction position of the rotating member 80 with respect to the housing 10 varies by the Z-direction length of the slight gap. Therefore, to repeat, the Z-direction position of the rotating member 80 relative to the housing 10 does not substantially change.

Again referring to FIG. 17, the rotating member 80 has an annular gripping portion 80a on the Z-direction lower side for a person to grip and rotate. As shown in FIG. 4, the grip portion 80a is positioned below the housing 10 in the Z direction and exposed to the outside. Therefore, a person can insert a finger into the gap to rotate the grip portion 80a of the rotating member 80, and can freely rotate the rotating member 80 in both directions in the θ direction with respect to the housing 10. .

In the above configuration, it is assumed that a person rotates the rotating member 80 with respect to the housing 10 using the grip portion 80a. Then, since the optical block 95 cannot rotate with respect to the housing 10 due to the locking of the locking portion 71 to the columnar portion 97, the optical block 95 does not rotate together with the rotation of the rotating member 80. Member 80 rotates relative to optical block 95 . Accordingly, this relative rotation causes the fitting claw 78 to move within the inclined groove 81, and as a result, the optical block 95 moves relative to the rotating member 80 in the Z direction. Therefore, as described above, even if the rotating member 80 rotates, the Z-direction position of the rotating member 80 hardly changes, so that the Z-direction position of the optical block 95 can be freely changed, and the moving lens included therein can be changed. The Z-direction position of 60 can also be freely changed.

FIG. 21 is a schematic cross-sectional view for explaining the dimensions of the light source 22, fixed lens 40, and moving lens 60. As shown in FIG. As shown in FIGS. 16 and 21, the moving lens 60 has an annular Fresnel 69 on the upper side in the Z direction and on the outer peripheral side in the .theta. direction. Further, as shown in FIG. 21A, the first projected area S2 of the orthogonal projection of the fixed lens 40 onto the vertical plane P perpendicular to the Z direction is the second projected area S1 of the orthogonal projection of the light source 22 onto the vertical plane P. That's it. Further, the third projected area S21 of the orthogonal projection of the light incident surface 86 of the fixed lens 40 with respect to the vertical plane P is smaller than the fourth projected area S22 of the orthogonal projection of the light exit surface 88 with respect to the vertical plane P, and the second projected area S1 is smaller than the third projected area S21. In this embodiment, the first projected area S2 matches the fourth projected area S22, but the first projected area S2 may be larger than the fourth projected area S22. Further, the fifth projected area S31 of the orthogonal projection of the light incident surface 83 on the side of the light source 22 in the Z direction of the moving lens 60 with respect to the vertical plane P is larger than the sixth projected area S32 of the orthogonal projection of the light projection surface 87 with respect to the vertical plane P. is also smaller, and the fourth projected area S22 is smaller than the fifth projected area S31.

Also, in this embodiment, the height h1 of the Fresnel 69 is larger than the thickness (height) h2 of the fixed lens 40 . Furthermore, as shown in FIG. 21(b), at the wide-angle position of the moving lens 60 where the moving lens 60 has moved most toward the light source 22 side in the Z direction, the fixed lens 40 is entirely positioned on the inner periphery of the ring-shaped Fresnel 69. It is adapted to be accommodated in a recess 77 defined by the surface 69a and an end surface 76 of the moving lens 60 on the side of the light source 22 in the Z direction.

In this embodiment, even if the Z-direction position of the movable lens 60 changes, the Z-direction dimension of the lighting device 1 does not change, so the lighting device 1 can be made compact and stylish. Here, the case where the inclined groove 81 has a through-hole structure having an elongated long hole shape has been described, but the inclined groove may have a structure having a bottom portion. In addition, in the illumination device 1 , the optical block is provided with the fitting claw 78 , and the rotary member 80 is provided with the inclined groove 81 in which the fitting claw 78 is fitted. enabled movement. However, the moving lens may be moved relative to the fixed lens in the Z direction by providing the rotating member with the fitting claw and providing the optical block with an inclined groove into which the fitting claw is fitted. Alternatively, a cylindrical pin may be fitted into the inclined groove instead of the fitting claw.

Alternatively, unlike the lighting device 1 of the first embodiment, the illumination device of the present disclosure may not have the inclined grooves 81 and may move the moving lens in the Z direction without using the inclined grooves 81 . For example, the illumination device of the present disclosure employs a configuration disclosed in many publications such as Patent Document 1, that is, a configuration in which the Z-direction dimension of the illumination device changes when the Z-direction position of the moving lens changes. good too. Further, in this case, the housing includes a first housing and a second housing, and a screw structure is used to move the second housing in the Z direction relative to the first housing. Alternatively, the movable lens fixed to the second housing may be moved in the Z direction relative to the fixed lens fixed to the first housing.

As described above, the lighting device 1 includes the housing 10, the light source 22 that is fixed in the housing 10 and emits light, and the lighting device 1 that is fixed in the housing 10 and is on the light emission side in the Z direction (optical axis direction) from the light source 22. and a light projection surface 87 arranged on the light emission side in the Z direction of the fixed lens 40, and the distance from the light source 22 in the Z direction can be varied. A moving lens 60 is provided. Further, while the light incident surface 86 of the fixed lens 40 is substantially flat, the light exit surface 88 is convex. Also, the first projected area S2 of the orthogonal projection of the fixed lens 40 onto the vertical plane P perpendicular to the Z direction is greater than or equal to the second projected area S1 of the orthogonal projection of the light source 22 onto the vertical plane P.

FIG. 22(a) is a schematic diagram showing the light distribution at a narrow angle in the lighting device 1, and FIG. FIG. 4 is a schematic diagram showing light distribution at narrow angle, medium angle, and wide angle in the lighting device. FIG. 22(c) is a schematic diagram showing the light distribution in the illumination device 1 at narrow angle, medium angle, and wide angle.

As shown in FIG. 22(b), in an illumination device without a fixed lens, at a medium angle, the luminous intensity in the central portion of the irradiation area is lower than that in the peripheral portion, which is likely to cause a middle dropout. On the other hand, since the illumination device 1 of the present disclosure has the fixed lens 40 fixed inside the housing 10, more of the emitted light emitted from the light source 22 can be received by the fixed lens 40, and the fixed lens The light received by 40 can be controlled to be distributed in a direction with a small tilt angle with respect to the Z direction, and can be controlled to go downward. Therefore, excellent narrow angle control can be performed. Furthermore, since the light received by the fixed lens 40 can be controlled to be distributed in a direction with a small inclination angle with respect to the Z direction, the efficiency of the equipment can be easily increased, and not only can the light be used efficiently, but also the light emitted from the light source 22 can be controlled. , the movable lens 60 facilitates more precise light distribution control, and as shown in FIG. Therefore, it is easy to achieve both good narrow-angle characteristics and suppression of the dropout in the middle, and the light from the light source 22 can be easily emitted to the irradiation area without loss. Therefore, the illumination device 1 includes a housing 10, a light source 22 fixed in the housing 10 and emitting light, and a movable lens system in which the distance between the light source 22 in the Z direction (optical axis direction) can be changed. 60 and a narrow-angle characteristic that suppresses a middle drop in which the illuminance of the irradiation light emitted from the moving lens 60 at the center is lower than the illuminance at the periphery, and reduces the area of the irradiation surface of the irradiation light. A narrow-angle mid-drop improving means capable of suppressing a drop is also provided. The fixed lens 40 is included in the narrow-angle dropout improving means.

Furthermore, according to the illumination device 1, the first projected area S2 is equal to or larger than the second projected area S1, and the light incident surface 86 of the fixed lens 40 is substantially flat. Therefore, it is easy not only to make the light from the light source 22 enter the fixed lens 40 efficiently, but also to easily convert the light passing through the fixed lens 40 into parallel light parallel to the Z direction, thereby easily suppressing the spread of the emitted light. Further, since the light exit surface 88 of the fixed lens 40 is convex, the light reaching the light exit surface 88 can be easily condensed, and the light projected from the light exit surface 88 can be efficiently directed to the moving lens 60. Easy to enter. Therefore, instrument efficiency can be further increased.

Further, the third projected area S21 of the orthogonal projection of the light incident surface 86 with respect to the vertical plane P may be smaller than the fourth projected area S22 of the orthogonal projection of the light exit surface 88 with respect to the vertical plane P. Also, the second projected area S1 may be smaller than the third projected area S21.

According to this configuration, since the second projected area S1 is smaller than the third projected area S21, the light from the light source 22 can enter the fixed lens 40 more efficiently. In addition, since the third projected area S21 is smaller than the fourth projected area S22, it becomes easier to control the light from the light source 22 downward in the Z direction, and the light from the fixed lens 40 is directed to the moving lens 60 more efficiently. Easier to enter. Therefore, instrument efficiency can be further increased. In addition, this configuration may not be adopted, and the third projected area may be equal to or larger than the fourth projected area. Also, the second projected area may be greater than or equal to the third projected area.

Further, the fifth projected area S31 of the orthogonal projection of the light incident surface 83 on the side of the light source 22 in the Z direction of the moving lens 60 with respect to the vertical plane P is larger than the sixth projected area S32 of the orthogonal projection of the light projection surface 87 with respect to the vertical plane P. may be smaller. Also, the fourth projected area S22 may be smaller than the fifth projected area S31.

According to this configuration, the fourth projected area S22 is smaller than the fifth projected area S31, so that the light emitted from the fixed lens 40 can enter the moving lens 60 efficiently. Further, since the fifth projected area S31 is smaller than the sixth projected area S32, it becomes easier to control the irradiation light from the illumination device 1 downward in the Z direction. Therefore, excellent narrow-angle light distribution at the narrow-angle position can be realized. In addition, this configuration may not be adopted, and the fourth projected area may be equal to or larger than the fifth projected area. Also, the fifth projected area may be greater than or equal to the sixth projected area.

Also, the distance in the Z direction between the light source 22 and the light incident surface 86 may be 1.5 mm or less.

According to this configuration, as described above, the light that is emitted from the light source 22 and does not enter the fixed lens 40 can be reduced, and the instrument efficiency can be further increased. This configuration may not be adopted, and the distance in the Z direction between the light source and the light incident surface of the fixed lens may be greater than 1.5 mm.

Also, the arithmetic average roughness of the light entrance surface 86 may be smaller than the arithmetic average roughness of the light exit surface 88 .

According to this configuration, the arithmetic mean roughness of the light entrance surface 86 is smaller than the arithmetic mean roughness of the light exit surface 88, so that the light incident on the light entrance surface 86 can be easily controlled. It is easy to efficiently guide light to the side. Furthermore, since the light emitted from the light emitting surface 88 can be easily mixed and mixed, as a result, the light on the optical axis side and the light on the peripheral side emitted from the LED can be easily mixed and mixed. can be done. Therefore, it is possible to suppress color unevenness in each irradiation area of the irradiation light, and to emit clean and beautiful illumination light. This configuration may not be adopted, and the arithmetic mean roughness of the light entrance surface of the fixed lens may be equal to or greater than the arithmetic mean roughness of the light exit surface of the fixed lens.

Also, the fixed lens 40 may have a Shore (A) hardness of 50-90.

As described above, if the light source contacts the light incident surface of the fixed lens, the light from the light source can be most efficiently incident on the fixed lens, resulting in excellent instrument efficiency. However, in such a case, the fixed lens tends to expand due to heat from the light source, and the expansion of the fixed lens may damage the fixed lens and the light source.

On the other hand, according to this configuration, the Shore (A) hardness of the fixed lens 40 is 50 to 90, and the fixed lens 40 has excellent elasticity. Therefore, when the light source 22 is brought into contact with the light incident surface 86 of the fixed lens 40 to achieve excellent instrument efficiency, even if the fixed lens 40 thermally expands, the fixed lens 40 is elastically deformed. Thus, damage to the fixed lens 40 and the light source 22 can be suppressed or prevented. Therefore, two functions and effects having a mutually trade-off relationship (mutually contradictory relationship), that is, a function and effect of being excellent in instrument efficiency and a function and effect of being able to suppress damage to the light source 22 and the fixed lens 40 can be achieved at the same time. can achieve remarkable effects.

In the first embodiment, the fixed lens 40 is made of a rubber elastic body made of a transparent silicone material, so that the Shore (A) hardness of the fixed lens 40 satisfies the requirement of 50 to 90. explained. However, the requirement that the Shore (A) hardness is 50 to 90 may be satisfied by configuring the fixed lens with a rubber elastic body made of a material other than a silicone material. may be filled with a clear elastomer of . Alternatively, this configuration may not be employed and the Shore (A) hardness of the fixed lens may be less than 50 and greater than 90.

Fixed lens 40 may also be made of a silicone material that includes silicone.

The closer the light source is to the light incident surface of the fixed lens, the higher the device efficiency and the brighter the illuminating light can be, while the fixed lens is more susceptible to thermal deterioration due to heat from the light source.

In contrast, according to this configuration, the fixed lens 40 is made of a silicone material that is excellent in heat resistance. Therefore, it is possible to simultaneously achieve two functions and effects that are in a mutually trade-off relationship (mutually contradictory relationship), that is, a function and effect that the instrument efficiency is excellent and a function and effect that thermal deterioration of the fixed lens 40 can be suppressed or prevented. can achieve remarkable effects. This configuration may not be adopted, and as described above, the fixed lens may be made of a transparent resin material such as acrylic or polycarbonate, or a glass material, or may be made of a transparent elastomer or the like. may

The lighting device 1 may also include a substrate 21 for fixing the light source 22 and a substrate holder 30 for fixing the substrate 21 to the housing 10 . In addition, the fixed lens 40 has a main body 41 that is substantially circular in plan view when viewed in the Z direction, and a radially extending lens 41 that faces the main body 41 in the radial direction from the edge of the main body 41 so as to face the main body 41 in the radial direction. A pair of holding portions 53 and 54 projecting in opposite directions may be provided. Then, as in this embodiment, the holding portions 53 and 54 may be indirectly fixed to the substrate holder 30 via another member 45, or the holding portion may be directly fixed to the substrate holder. .

According to this configuration, since the fixed lens 40 has the pair of holding portions 53 and 54 radially projecting from the edge portions 41a and 41b of the main body 41, the holding portions 53 and 54 are used to hold the fixed lens 40 to the substrate holder. can be easily fixed to Further, since the fixed lens 40 can be reliably fixed to the substrate holder 30 to which the light source 22 is fixed using the holding portions 53 and 54, it is possible to prevent the optical axis of the fixed lens 40 from being displaced with respect to the light source 22. Desired irradiation light can be emitted easily. Note that this configuration may not be adopted. For example, the fixed lens is not indirectly fixed to the housing 10 via the substrate holder 30 by fixing the fixed lens 40 to the substrate holder 30 as in this configuration, but the fixed lens is fixed by fixing means, For example, it may be fixed directly to the housing using an adhesive, a fastening member, or the like.

In addition, the fixed lens 40 includes a body 41 that is substantially circular in plan view when viewed in the Z direction, and a pair of holding portions 53 that project radially from the edge of the body 41 so as to face the body 41 in the radial direction. , 54. The transmittance of the main body 41 may be higher than the transmittance of the holding portions 53 and 54 .

According to this configuration, the light passing through the fixed lens 40 can be easily controlled downward in the Z direction, and the light from the main body 41 to the holding portions 53 and 54 can be suppressed. Therefore, it is possible to suppress stray light that is emitted from the light source 22, stays in the illumination device 1 and attenuates, and increases the efficiency of the device. This configuration may not be adopted, and the transmittance of the main body of the fixed lens may be equal to or less than the transmittance of the holding portion of the main body. Further, as described above, the fixed lens may not have a holding portion, and may be configured only with a substantially circular portion when viewed from the Z direction. Furthermore, in the above embodiment, the transmittance of the main body 41 of the fixed lens 40 is higher than the transmittance of the moving lens 60. good. Further, when all the fixed lenses are made of the same material, the transmittance of the fixed lenses is preferably higher than the transmittance of the moving lenses, but the transmittance of the fixed lenses may be less than or equal to the transmittance of the moving lenses.

Also, the refractive index of the fixed lens 40 may be smaller than the refractive index of the moving lens 60 .

Also in this configuration, the light passing through the fixed lens 40 can be easily controlled downward in the Z direction, and the light from the main body 41 to the holding portions 53 and 54 can be suppressed. Therefore, it is possible to suppress stray light that is emitted from the light source 22, stays in the illumination device 1 and attenuates, and increases the efficiency of the device. Note that this configuration may not be adopted, and the refractive index of the fixed lens 40 may be equal to or higher than the refractive index of the moving lens 60 .

Moreover, the illumination device 1 may have an inner peripheral surface 85 arranged to surround the moving lens 60 . In addition, the inner peripheral surface 85 may include a low reflectance inner surface portion that is positioned closer to the light emitting side than the position where the movable lens 60 moves most toward the light source 22 in the Z direction and has a light reflectance of 15% or less. .

According to this configuration, light is less likely to be reflected by the low-reflectance inner surface portion, and light can be absorbed by the low-reflectance inner surface portion. Therefore, glare when a person looks up at the lighting device 1 can be reduced. In addition, as described above, this configuration may not be adopted, and the lighting device may not have such a low reflectance inner surface portion.

Also, the moving lens 60 may have an annular Fresnel 69 protruding toward the light source 22 in the Z direction. Further, it may be possible to arrange that all of the fixed lenses 40 are accommodated in the concave portion 77 defined by the inner peripheral surface 69a of the annular Fresnel 69 and the end surface 76 of the movable lens 60 on the side of the light source 22 in the Z direction.

According to this configuration, it is possible to increase the equipment efficiency during wide-angle control in which the moving lens 60 is present at the wide-angle position, and to irradiate particularly bright illumination light in the wide-angle control. In addition, since the movement range of the moving lens 60 in the Z direction can be increased, the degree of freedom of light distribution in the illumination device 1 can be increased, and excellent light distribution control can be realized.

Furthermore, although not described in detail in the above embodiment, by adopting the following configuration, it is possible to obtain a special action and effect.

Specifically, the moving lens 60 may have one or more Fresnels 69 on the upper side in the Z direction and on the outer peripheral side in the R direction. It may have one or more Fresnels 69 .

According to this configuration, it is easy for the Fresnel 69 to receive the light emitted from the light source 22 to the outside in the R direction. Therefore, instrument efficiency can be increased. Although this configuration is preferably employed, it may not be employed, and the moving lens may not have a Fresnel on the upper side in the Z direction and on the outer peripheral side.

Further, as shown in FIG. 4, the lens effective diameter of the fixed lens 40 on the light emitting side in the Z direction (reference number 26 indicates one point located on the lens effective diameter of the fixed lens 40) The outer diameter, more specifically, is larger than the diameter of the circumscribed circle of the Z-direction lower annular edge of the light source 22, and is the lens effective diameter of the moving lens 60 on the Z-direction light exit side (reference number 31 is the moving lens 60 (one point located on the effective diameter of the lens). Here, the effective diameter of the lens is defined as the maximum diameter of the region through which the light rays pass on the surface of the lens through which the light rays pass. Alternatively, the effective diameter of the lens may be defined as the diameter of a bundle of parallel rays that pass through the lens from an object point at infinity on the optical axis of the lens.

According to this configuration, the fixed lens 40 can efficiently receive the light emitted from the light source 22, and furthermore, the light condensing power of the fixed lens 40 is arranged at a narrow angle of the ambient light emitted from the fixed lens 40. It becomes easy to adjust the condensing power so that it can be incident on the light incident surface 83 of the movable lens 60 . Further, when the effective lens diameter of the fixed lens 40 is smaller than the inner diameter of the annular Fresnel 69 located on the innermost side as in this embodiment, the ambient light is arranged at a narrow angle position. It is preferable because the light can be easily incident on the outer edge portion 83a of the light incident surface 83 of the movable lens 60. It should be noted that although these configurations are preferably employed, they do not have to be employed.

Also, the effective lens diameter of the fixed lens 40 on the light exit side in the Z direction may be 2.5 times or more the diameter of the circumscribed circle.

This configuration allows for narrow angle performance without increasing from typical device sizes, e.g., less than 14° at 1/2 beam angle without increasing from typical device sizes It becomes possible to realize excellent narrow-angle performance. In the case of a device such as a universal downlight whose optical axis direction can be adjusted by swinging, it is difficult to extend the device because of the fixed diameter of the hole in the ceiling and the swinging angle of the device. Therefore, the effect of this configuration becomes more remarkable. In addition, although it is preferable to employ this configuration, it does not have to be employed.

In addition, the fixed lens 40 directs the ambient light of the light cone emitted therefrom to the outer edge of the light incident surface 83 in the Z direction of the moving lens 60 located at the narrow angle position farthest from the light source 22 . It may have a degree of convergence that allows it to be incident on 83a. In other words, the fixed lens 40 directs ambient light, which is positioned in the surroundings of the emitted light emitted therefrom, to the outer edge portion 83a of the light incident surface 83 of the movable lens 60 positioned closest to the light emission side in the optical axis direction. It may have a concentration that allows it to be incident on the .

According to this configuration, the light emitted from the fixed lens 40 can be efficiently incident on the moving lens 60, and the instrument efficiency can be further increased. In addition, although it is preferable to employ this configuration, it does not have to be employed.

As described above, in the first embodiment, the case where the technical idea of the present disclosure is applied to an embedded downlight has been described as an example. However, the lighting device may be suspended on rails or may be suspended on the ceiling. Also, the illumination device of the present disclosure may be a spotlight. Furthermore, when the lighting device of the present disclosure is a downlight or spotlight, there are a wide variety of structures for downlights and spotlights. may be based on any structure.

(Second embodiment)
In the second embodiment, an example of applying the technical idea of the present disclosure to a spotlight will be described. Any one or more of all the configurations described in the first embodiment can be applied to the spotlight that constitutes the illumination device 101 of the second embodiment.

FIG. 23 is a perspective view of lighting device 101 according to the second embodiment of the present disclosure. The illumination device 101 is a spotlight, and includes a power source section 105 that also serves as a mounting section, a support section 110 and a main body section 115 . The power supply unit 105 is attached to a wiring duct (not shown). The power supply unit 105 has an accommodating portion 106 and a power supply circuit (not shown) accommodated in the accommodating portion 106 . AC power from an external power supply such as a commercial power supply is supplied to the power supply circuit through a wiring duct. The power supply circuit converts the AC power into DC power by, for example, rectifying or smoothing the supplied AC power, and supplies the converted DC power to the light source described later. Further, although not described in detail, the support portion 110 is attached to, for example, one side end portion in the longitudinal direction of the elongated accommodation portion 106 and extends in a direction substantially orthogonal to the longitudinal direction. The body portion 115 incorporates a light source 143 (see FIG. 27). The body portion 115 is attached to the support portion 110 so that the optical axis direction of the light emitted from the light source 143 can be changed.

24 is an exploded perspective view of the main portion 120 of the body portion 115. FIG. As shown in FIG. 24, main section 120 includes housing 130, fixed lens assembly 140, moving lens assembly 160, and hood 195. As shown in FIG. The housing 130 includes an outer cylinder 130a and an inner member 130b, and the inner member 130b is inserted into the outer cylinder 130a from one axial side of the outer cylinder 130a. The inner member 130b is fixed by screwing with screws 191 to the inner flange portion 190 (see FIG. 25) of the outer cylinder 130a. Also, the fixed lens assembly 140 is screwed into the housing 130 and the moving lens assembly 160 is rotatably attached to the housing 130 . Although not described in detail, the hood 195 is a cylindrical member and is locked to the movable lens assembly 160 using a spring member (not shown), for example. The hood 195 plays a role such as limiting the irradiation area of the emitted light.

FIG. 25 is a perspective view of the housing 130 viewed from the light exit side. As shown in FIG. 25, the housing 130 has a tubular portion 131 with an opening on the light output side, and includes a substrate contact portion 133 on its main surface 132 (end surface on the light output side). A fixed lens assembly 140 (see FIG. 24) is fixed to the main surface 132 . FIG. 26 is a perspective view of fixed lens assembly 140 . As shown in FIG. 26, the fixed lens assembly 140 has the same structure as the fixed lens assembly 90 of the first embodiment, and includes a light source module, a substrate holder 145, a fixed lens 148, and a lens mounting member 150. The fixed lens 148 is included in the narrow-angle dropout improvement means. 27, that is, a perspective view showing a state in which the fixed lens 148 and the lens mounting member 150 are removed from the fixed lens assembly 140, the light source module 125 has a substrate 142 and a light source 143. As shown in FIG. The substrate 142 has a substantially rectangular shape in plan view. Also, the light source 143 has a disk-like shape and is arranged substantially in the center of the mounting surface of the substrate 142 .

The fixed lens assembly 140 has a structure similar to that of the first embodiment, and is fixed to the main surface 132 of the cylindrical portion 131 (see FIG. 25) using two holder fixing members 146 and two screws shown in FIG. . As in the first embodiment, the holder fixing member 146 presses a portion of the periphery of the light emitting side surface of the substrate 142 to the side opposite to the light emitting side. When the fixed lens assembly 140 is fixed to the main surface 132, the surface of the substrate 142 opposite to the light emitting side comes into contact with the substrate abutting portion 133 (see FIG. 25), thereby heat generated by the light source 143. of heat can be efficiently carried out.

28 is a perspective view of the moving lens assembly 160. FIG. The moving lens assembly 160 also has the same structure as the moving lens assembly 75 of the first embodiment, and includes an optical block 161 and a rotating member 165. The optical block 161 includes a lens holder 162 and a moving lens 163.

The illumination device 101 has a C-shaped retaining ring 194 whose perspective view is shown in FIG. The C-shaped retaining ring 194 is made of a material that is easily elastically deformable, and is easily elastically deformable in the R direction. The C-shaped retaining ring 194 has a plurality of projecting portions 192 positioned at intervals in the θ direction and projecting outward in the R direction. On the other hand, the rotary member 165 has an annular groove (not shown) extending in the θ direction on the inner peripheral side, and as shown in FIG. have. The plurality of through holes 193 are positioned at intervals in the θ direction. The C-shaped retaining ring 194 is fitted into the annular groove and fixed, and the projecting portion 192 is inserted through the through hole 193 . A portion 192a of the protruding portion 192 protruding outward in the R direction from the rotating member 165 is a circumferentially extending groove (not shown) provided in the inner peripheral surface of the tubular portion 131 and extending in the θ direction. for example, in an annular groove). In this manner, the rotary member 165 is attached rotatably relative to the tubular portion 131 while the Z-direction position relative to the tubular portion 131 hardly changes. Using this mounting method eliminates the need for the tubular portion 131 to have a split structure. Therefore, the ease of handling and the ease of assembly of the lighting device 101 can be significantly improved. Note that the rotating member 165 may be fixed to the inner peripheral side of the tubular portion 131 with the same structure as in the first embodiment.

As shown in FIG. 28, in the illumination device 101 (see FIG. 23) of the second embodiment, the rotary member 165 has a grip portion 164 on the lower side in the Z direction, similarly to the illumination device 1 of the first embodiment. As shown in FIG. 23 , the grip portion 164 is positioned closer to the light exit side in the Z direction than the cylindrical portion 131 and is exposed to the outside. The illumination device 101 of the second embodiment also has a structure similar to that of the illumination device 1 of the first embodiment. , the moving lens 163 moves relative to the fixed lens 148 in the Z direction.

Also in the second embodiment, the illumination device 101 includes a housing 130, a light source 143 that is fixed in the housing 130, and a distance in the Z direction (optical axis direction) between the light source 143 and the light source 143 is variable. A moving lens 163 and a narrow angle that suppresses the illuminance of the central portion of the irradiation surface of the irradiation light emitted from the moving lens 163 to be lower than the illuminance of the peripheral portion, and reduces the area of the irradiation surface of the irradiation light. and a narrow angle middle drop improving means capable of suppressing deterioration of characteristics. The fixed lens 148 is included in the narrow-angle dropout improving means. The illumination device 101 also includes a light source 143 that is fixed to the housing 130 and emits light, and a light emitting device that is fixed in the housing 130 and positioned on the light emission side in the Z direction (optical axis direction) from the light source 143 . A fixed lens 148 having a surface is provided. The illumination device 101 also includes a movable lens 163 that has a light projection surface that is arranged on the light emission side in the Z direction relative to the fixed lens 148 and whose distance from the light source 143 in the Z direction is variable. Moreover, while the light incident surface of the fixed lens 148 is substantially flat, the light exit surface is convex. Also, the first projected area of the orthogonal projection of the fixed lens 148 on the vertical plane perpendicular to the Z direction is greater than or equal to the second projected area of the orthogonal projection of the light source 143 on the vertical plane. Therefore, it is easy to achieve both excellent narrow-angle characteristics and suppression of the drop-in angle, and the light from the light source 143 can be emitted to the irradiation area without loss.

Moreover, the lighting device 101 can apply any configuration that can be applied to the lighting device 1, and can exhibit all the effects that the lighting device 1 can exhibit. For example, the third projected area of the orthogonal projection of the light entrance surface of fixed lens 148 to the vertical plane may be smaller than the fourth projected area of the orthogonal projection of the light exit surface of fixed lens 148 to the vertical plane. Also, the second projected area may be smaller than the third projected area.

According to this configuration, the light from the light source 143 can enter the fixed lens 148 more efficiently. In addition, it becomes easier to control the light from the light source 143 downward in the Z direction, and it becomes easier to make the light from the fixed lens 148 more efficiently enter the moving lens 163 . Therefore, instrument efficiency can be further increased.

The fifth projection area of the orthogonal projection of the light incident surface on the light source 143 side in the Z direction of the moving lens 163 with respect to the vertical plane is the positive projection surface on the light emitting side of the moving lens 163 in the Z direction with respect to the vertical plane. It may be smaller than the sixth projected area of the projection. Also, the fourth projected area may be smaller than the fifth projected area.

According to this configuration, light emitted from the fixed lens 148 can be efficiently incident on the moving lens 163 . In addition, it becomes easier to control the irradiation light from the illumination device 101 downward in the Z direction, and excellent narrow-angle light distribution at a narrow-angle position can be realized.

Also, the distance in the Z direction between the light source 143 and the light incident surface of the fixed lens 148 may be 1.5 mm or less.

According to this configuration, the light emitted from the light source 143 and not entering the fixed lens 148 can be reduced, and the efficiency of the device can be further increased.

Also, the arithmetic mean roughness of the light incident surface of fixed lens 148 may be smaller than the arithmetic mean roughness of the light exit surface of fixed lens 148 .

According to this configuration, it is easy to control the light incident on the light incident surface and to efficiently guide the light to the light emitting surface side. In addition, since the light emitted from the light emitting surface can be easily mixed and can be mixed, as a result, the light on the optical axis side and the light on the peripheral side emitted from the LED can be easily mixed and can be mixed. . Therefore, it is possible to suppress color unevenness in each irradiation area of the irradiation light, and to emit clean and beautiful illumination light. Note that spotlights are subject to highly narrow-angle control, so color unevenness tends to stand out. Therefore, if this configuration is adopted, remarkable effects can be obtained.

Also, the fixed lens 148 may have a Shore (A) hardness of 50-90.

According to this configuration, the fixed lens 148 has excellent elasticity. Therefore, at the temperature of any fixed lens 148 during use, even if the light source 143 is brought into contact with the light incident surface of the fixed lens 148 to achieve good instrument efficiency, the fixed lens 148 will elastically deform. Accordingly, damage to the fixed lens 148 and the light source 143 can be suppressed or prevented. Therefore, two functions and effects having a mutually trade-off relationship (mutually contradictory relationship), that is, a function and effect of being excellent in instrument efficiency and a function and effect of being able to suppress damage to the light source 143 and the fixed lens 148 can be achieved simultaneously. can achieve remarkable effects.

Fixed lens 148 may also be constructed of a silicone material that includes silicone.

According to this configuration, the fixed lens 148 is made of a silicone material with excellent heat resistance. Therefore, it is possible to achieve two functions and effects in a mutually trade-off relationship (mutually contradictory relationship), that is, a function and effect of being excellent in instrument efficiency and a function and effect of being able to suppress or prevent thermal deterioration of the fixed lens 148 at the same time. can achieve remarkable effects.

The illumination device 101 may also include a substrate 142 for fixing the light source 143 and a substrate holder 145 for fixing the substrate 142 to the cylindrical portion 131 . Further, as shown in FIG. 31, that is, a perspective view of the fixed lens 148 when viewed from the light emitting side in the Z direction, the fixed lens 148 has a main body 141, which is substantially circular in plan view when viewed in the Z direction. and a pair of holding portions 153 and 154 protruding radially from the edge of the main body 141 so as to face the main body 141 in the radial direction. Then, as in this embodiment, the holding portions 153 and 154 are indirectly fixed to the substrate holder 145 via another member 150 (see FIG. 26), or the holding portion is directly attached to the substrate holder. May be fixed.

According to this configuration, the fixed lens 148 has a pair of holding portions 153 and 154 projecting radially from the edge portion of the main body 141 . can be fixed to Further, since the fixed lens 148 can be reliably fixed to the substrate holder 145 to which the light source 143 is fixed using the holding portions 153 and 154, the optical axis of the fixed lens 148 can be prevented from being displaced with respect to the light source 143. Desired irradiation light can be reliably emitted.

In addition, the fixed lens 148 includes a main body 141 that is substantially circular in plan view when viewed in the Z direction, and a pair of holding portions 153 that project radially from the edge of the main body 141 so as to face the main body 141 in the radial direction. , 154. Also, the transmittance of the main body 141 may be higher than the transmittance of the holding portions 153 and 154 . Also, the refractive index of the fixed lens 148 may be smaller than the refractive index of the moving lens 163 .

With these configurations, the light passing through the fixed lens 148 can be easily controlled downward in the Z direction, and the light from the main body 141 to the holding portions 153 and 164 can be suppressed. Therefore, it is possible to suppress the stray light that is emitted from the light source 143 and stays in the lighting device 101 and attenuates, thereby increasing the efficiency of the device.

Also, the illumination device 101 may have an inner peripheral surface arranged to surround the moving lens 163 . The inner peripheral surface may include a low-reflectance inner surface portion located on the light emission side of the position where the moving lens 163 is most moved to the light source 143 side in the Z direction and having a light reflectance of 15% or less. .

According to this configuration, light is less likely to be reflected by the low-reflectance inner surface portion, and light can be absorbed by the low-reflectance inner surface portion. Therefore, glare when a person looks up at the lighting device 101 can be reduced.

Also, the moving lens 163 may have an annular Fresnel 169 (FIG. 28) projecting toward the light source 143 in the Z direction. In addition, all of the fixed lenses 148 may be accommodated in the concave portion 177 defined by the inner peripheral surface 169a of the annular Fresnel 169 and the end surface 176 of the moving lens 163 on the side of the light source 143 in the Z direction.

According to this configuration, it is possible to increase the equipment efficiency when performing wide-angle control in which the moving lens 163 exists at the wide-angle position, and to irradiate particularly bright illumination light in wide-angle control. In addition, since the moving range of the moving lens 163 in the Z direction can be increased, the degree of freedom of light distribution in the lighting device 101 can be increased, and the lighting device 101 can be realized with excellent light distribution control.

As described above, in the first embodiment, an example of applying the technical idea of the present disclosure to a downlight is described, and in the second embodiment, an example of applying the technical idea of the present disclosure to a spotlight is described. explained. However, the technical idea of the present disclosure may be applied to any lighting device other than downlights and spotlights, such as ceiling lights, line lights, floor lights, or pendant lights.

In short, the illumination device includes a housing, a light source fixed in the housing and emitting light, and a fixed lens fixed in the housing and having a light emitting surface located on the light emitting side in the optical axis direction relative to the light source. and a moving lens having a light projection surface arranged on the light exit side in the optical axis direction of the fixed lens and having a variable distance from the light source in the optical axis direction, wherein the light entrance surface of the fixed lens is approximately flat, the light exit surface is convex, and the first projected area of the orthogonal projection of the fixed lens onto a vertical plane perpendicular to the optical axis direction is greater than or equal to the second projected area of the orthogonal projection of the light source onto the vertical plane. Any type of illumination device may be used as long as it has a configuration of

In addition, in comparison with each of the illumination devices of all the embodiments and the illumination devices of the modified examples described so far, the light incident surface 234 of the fixed lens 248 is not substantially flat, and the light incident surface 234 of the fixed lens 248 is flat. Alternatively, as shown in the schematic cross-sectional view of FIG. 32, the illumination device 201 may be made different only in that it has an annular Fresnel 278 protruding toward the substrate 221 in the Z direction on the outer peripheral side in the radial direction.

Further, in this case, the tip (Z-direction upper end) 278a of the Fresnel 278 is closer to the substrate 221 in the Z-direction than the position moved 1 mm in the Z-direction toward the light-emitting side of the tip of the light source 222 on the light-emitting side. is preferably located in Also, the Z-direction position of the tip 278a of the Fresnel 278 coincides with the Z-direction position of the tip (Z-direction lower end) 222a on the light emission side of the light source 222, or the Z-direction position of the tip 222a on the light emission side of the light source 222. It is more preferable to position the fresnel 278 closer to the substrate 221 , in which case the tip 278 a of the fresnel 278 may come into contact with the substrate 221 .

By forming such an illumination device, the light from the light source 222 can be efficiently incident on the fixed lens 248. In particular, the tip 222a of the light source 222 on the light exit side is radially surrounded by the annular Fresnel 278. In this case, the light from the light source 222 can enter the fixed lens 248 more efficiently. Therefore, it is possible to realize a lighting device with excellent fixture efficiency.

(Third embodiment)
In the illuminating device (downlight) 1 of the first embodiment, the case where the narrow-angle drop-off improving means includes the fixed lens 40 has been described, and the case where the illuminating device 1 has the fixed lens 40 and the moving lens 60 has been described. Then, the case where the illumination device 1 has a double lens structure (dual lens structure) has been described. However, the illumination device may not have a fixed lens. In the third embodiment, a case where the lighting device 301 is a downlight having only a moving lens 360 without a fixed lens will be described.

FIG. 33 is a perspective view of the illumination device 301 of the third embodiment, and FIG. 34 is a perspective view of the illumination device 301 viewed from another direction. As shown in FIG. 33, the illumination device 301 is a recessed universal downlight having an optical axis adjusting member 317 like the illumination device 1 of the first embodiment, and the Z direction (optical axis direction) is the vertical direction. can be changed to a desired angle with respect to Further, as shown in FIG. 34 , in lighting device 301 , similar to lighting device 1 , housing 310 has a two-part structure and includes first member 310 a , second member 310 b and bolt 398 . The housing 310 is configured by integrally fixing the first member 310a and the second member 310b with bolts 398. As shown in FIG. The structure for fixing the lighting device 301 around the hole in which it is embedded is the same as that of the first embodiment, and the description thereof is omitted.

FIG. 35 is an exploded perspective view of the main parts of the illumination device 301. FIG. As shown in FIG. 35, the illumination device 301 includes a first member 310a, a second member 310b, a light source module 325, a rotating member 380, a substrate holder 330, a lens holder 370, and a moving lens 360. Also, the light source module 325 includes a substrate 321 and a light source 322 , and the light source 322 is fixed to the mounting surface of the substrate 321 on the light emitting side. These members or parts have structures similar to those of the corresponding members or parts in the lighting device 1 of the first embodiment. Further, these members or parts are made of the same material as the corresponding members or parts in the lighting device 1, for example.

As in the first embodiment, the light source module 325 is fixed to the main surface 311 of the housing 310 by bolts (not shown) while being held by the substrate holder 330 . Also, with the same structure as in the first embodiment, the moving lens 360 is fixed to the lens holder 370, and the fitting claw 378 as an example of the fitting portion of the lens holder 370 is fitted to the inclined groove (helical groove) of the rotating member 380. groove) 381 so as to be movable. In this manner, a moving lens assembly 375, the perspective view of which is shown in FIG. 36, is constructed.

Thereafter, in the same structure as in the second embodiment, the movable lens assembly 375 is mounted using an elastically deformable C-shaped retaining ring 394 having a protruding portion 394a (see FIG. 36) as an example of a guide locking portion. , the projecting portion 394a is moved in the θ direction into a circumferentially extending groove 385 (see FIG. 35) provided in the inner peripheral surface of the housing 310 integrally fixed with the first and second members 310a and 310b. When possible to fit together, lighting device 301 is constructed. Note that the moving lens assembly 375 may be fixed to the housing 310 using the structure described in the first embodiment without using the C-shaped retaining ring 394 .

Next, the narrow angle midpoint improvement means of the illumination device 301 of the third embodiment will be described. 37 is a perspective view of the moving lens 360 when viewed from the light incident side, and FIG. 38 is a perspective view of the moving lens 360 when viewed from the light emitting side. FIG. 39 is a cross-sectional view of the moving lens 360 taken along a plane passing through its optical axis. As shown in FIG. 37, the moving lens 360 has an annular Fresnel 369 on the upper side in the Z direction and the outer side in the R direction. In the example shown in FIG. 37, the moving lens 360 has only one annular Fresnel 369 on the upper side in the Z direction. may have

Further, as shown in FIG. 39, the moving lens 360 includes a dome-shaped portion 351, a flange portion 352, and an annular Fresnel 353 at the end on the light exit side. The dome-shaped portion 351 is located in the central portion in the R direction and has a dome shape convex downward in the Z direction. Further, the flange portion 352 is positioned at the outer end in the R direction and protrudes outward in the R direction. The Fresnel 353 is positioned between the dome-shaped portion 351 and the flange portion 352 in the R direction and protrudes downward in the Z direction.

Further, as shown in FIG. 39, the Fresnel 369 has a reflecting surface 334, which is an outer peripheral surface, on the outer side in the R direction. The reflecting surface 334 is an annular tapered surface centered on the optical axis X of the movable lens 360, and gradually expands in diameter from the upper end to the lower end. The reflecting surface 334 reflects the light that spreads radially outward toward the light exit surface 333 to improve the light utilization efficiency. The reflecting surface 334 is a so-called total reflecting surface, and totally reflects light incident at an angle equal to or larger than the critical angle. The upper end of the reflecting surface 334 is positioned at the upper end of the moving lens 360 and the lower end of the reflecting surface 334 is connected to the flange portion 352 .

Reflective surface 334 is included in narrow-angle drop-off improvement means. Specifically, the reflective surface 334 includes an inner convex region 334a convex to the optical axis X side and an outer convex region 334b convex to the side opposite to the optical axis X. As shown in FIG. Especially when the distance between the light source 322 and the moving lens 360 is reduced to increase the light distribution angle, the inner convex region 334a reflects the light spreading outward in the R direction to the direction directly below the illumination device 301, and the outer convex region 334b reflects When the light source 322 and the moving lens 360 are separated from each other and the light distribution angle is set small, the arriving light is efficiently reflected directly below the illumination device 301 . Therefore, when the reflecting surface 334 is formed with the inner convex region 334a and the outer convex region 34b, the light reflected by the reflecting surface 334 can be efficiently irradiated directly below the lighting device 301, and the central portion of the irradiation region becomes dark. It is possible to suppress the occurrence of falling.

The reflective surface 334 includes a plurality of each of the inner convex regions 334a and the outer convex regions 334b, which may be wavy, but preferably includes one of each. The inner convex region 334a is preferably formed closer to the light exit surface 333 than the outer convex region 334b, that is, closer to the lower end of the moving lens 360. As shown in FIG. In this embodiment, the reflective surface 334 includes one inner convex region 334 a and one outer convex region 334 b , and the continuous inner convex region 334 a and outer convex region 334 b are formed over the entire reflective surface 334 .

The inner convex region 334a and the outer convex region 334b are preferably curved surfaces that do not have bent portions, and are annularly formed with the optical axis X as the center. In this embodiment, the inner convex region 334 a gently curves toward the inside of the moving lens 360 , and the outer convex region 334 b gently curves toward the outside of the moving lens 360 . The inner convex region 334a and the outer convex region 334b may be curved surfaces having a constant curvature or curved surfaces having a varying curvature. In this embodiment, the radius of curvature of the outer convex region 334b is larger than the radius of curvature of the inner convex region 334a.

In this embodiment, the width (length in the optical axis direction) of the outer convex region 334b is wider than the width of the inner convex region 334a, and the area of the outer convex region 334b is larger than the area of the inner convex region 334a. The area ratio between the inner convex region 334a and the outer convex region 334b is preferably changed according to the curvature of each region, and the area of the outer convex region may be smaller than the area of the inner convex region.

The moving lens 360 defines the area of the inner convex region 334a as S1, the radius of curvature of the inner convex region 334a as R1, the area of the outer convex region 334b as S2, the radius of curvature of the outer convex region 334b as R2, and the maximum radius of the reflecting surface 334. When the diameter is φ, it is preferable to satisfy at least one of the following relationships (1) and (2), and it is particularly preferable to satisfy both of the relationships (1) and (2). When the conditions (1) and (2) are satisfied, it is possible to more effectively suppress the occurrence of the dropout. When the area S1 of the inner convex region 334a is small, it is preferable to set the curvature radius R1 of the inner convex region 334a small to set the curvature large.
(1) R2≧1.5×φ
(2) 5×φ×(S1/S2) ² ≦R1≦25×φ×(S1/S2) ²

Next, a dimensional relationship that is preferable to be employed in the lighting device 301 will be described. 40 is a perspective view of the housing 310 viewed from below in the Z direction, and FIG. 41 is a perspective view of the lens holder 370. FIG. The illumination device 301 has the same anti-corotation structure as the structure described in detail in the first embodiment. Specifically, as shown in FIG. 40, the housing 310 has one or more columnar portions 350 provided on the inner wall surface 391 of the light source housing chamber 390 that houses the light source 322 and extending in the Z direction. , has a plurality of columnar portions 350 as in the present embodiment.

Also, as shown in FIG. 41, the lens holder 370 has an annular portion 371 and one or more legs 372, preferably a plurality of legs 372 as in the present embodiment. The leg portion 372 is an example of a circumferential movement restricting portion and extends upward in the Z direction from the annular portion 371 . The plurality of columnar portions 350 and the plurality of leg portions 372 are arranged at intervals in the θ direction. The leg portion 372 has a locking surface 377 that opens outward in the R direction and in the vertical direction in the Z direction on the outer surface on the outer side in the R direction. The locking surface 377 is an example of a locking portion. By locking the columnar portion 350 to the locking surface 377 of the leg portion 372 so as to be relatively movable in the Z direction, the lens holder 370 is prevented from rotating along with the housing 310 in the circumferential direction. It limits the circumferential movement range of the lens holder 370 with respect to 310 .

42A and 42B are diagrams for explaining the size relationship that is preferably established with respect to the dimensions of the housing 310, the moving lens 360, and the lens holder 370. FIG. As shown in FIG. 42, the Z-direction height H1 of the Fresnel 369 having the highest Z-direction height among the one or more annular Fresnels 369 is the highest among the one or more leg portions 372 in the Z-direction. is lower than the height H2 of the tall leg 372 in the Z direction.

According to this configuration, the moving range of the moving lens 360 in the Z direction can be increased.

Also, the height H2 of the leg portion 372 having the highest height in the Z direction among the one or more legs 372 is the height of the columnar portion 350 having the highest height in the Z direction among the columnar portions 350 having one or more. Higher than H3 is preferred.

According to this configuration, a larger area in the height direction of the leg portion 372 can be supported by the columnar portion 350 and can be supported. Therefore, rattling of the moving lens 260 can be suppressed.

Moreover, it is preferable that the housing 310 has a plurality of columnar portions 350 and the lens holder 370 has a plurality of leg portions 372 .

According to this configuration, it is possible to prevent the optical axis X of the movable lens 360 from being displaced with respect to the light source 322 when the movable lens 360 is moved. Therefore, it becomes easier to emit irradiation light in a desired direction.

In addition, the illumination device 301 is arranged such that the inner wall surface 391 defining the light source housing chamber 390 for housing the light source 322 in the housing 310 has substantially the same height position in the Z direction, and the θ A rotating member 380 may be provided that is relatively rotatable in a direction. Also, the rotating member 380 may have an inclined groove 381 . The lens holder 370 has fitting claws 378 that fit into the inclined grooves 381, and the movable lens 360 can continuously move in the Z direction inside the housing 310 while rotating about the optical axis X. It's okay.

According to this configuration, the light distribution can be changed continuously, and the desired illumination light can be easily set.

In addition, the housing 310 may have a guide portion on the inner wall surface 391 (see FIG. 40) that guides the rotation member 380 so as to be movable in the θ direction. A groove 385 may be used. 36, the projecting portion 394a of the C-shaped snap ring 394 may be engaged with the circumferentially extending groove 385 so as to be relatively movable in the .theta. direction. Moreover, the housing 310 may have a structure that can be divided into a plurality of members, and may include, for example, a first member 310a and a second member 310b.

According to this configuration, it is possible to reliably prevent the rotating member 380 from falling, and to improve the assembling and disassembling performance of the rotating member 380 . Furthermore, heat can be easily dissipated from the gaps between the first and second members 310a and 310b that are integrated with the bolts 398 to form the annular housing 310, and as a result, the heat dissipation of the lighting device 301 can be improved. can be done.

Moreover, the surface reflectance of the housing 310 may be 15% or less.

According to this configuration, it is possible to suppress the light that becomes uncontrollable due to reflection on the inner peripheral surface of the housing 310, and it is possible to suppress the disturbance of the light distribution of the irradiation light.

Moreover, the surface reflectance of the housing 310 may be 70% or more.

According to this configuration, it is possible to prevent heat from accumulating in the housing 310 and to prevent heat deterioration of the housing 310 .

Further, referring to FIG. 42, light source 322 may have a disk-like shape. Among the one or more annular Fresnels 369 , the innermost inner diameter L1 of the fresnel 369 located on the innermost side in the R direction of the moving lens 360 at the end opposite to the light emission side in the Z direction is equal to the outer diameter L2 of the light source 322 . may be greater than

According to this configuration, among the light emitted from the light source 322, the amount of light incident on the innermost side in the R direction relative to the innermost Fresnel 369 can be increased. can be reduced and instrument efficiency can be increased.

(Fourth embodiment)
In the fourth embodiment, a description will be given of a case where the illumination device is a spotlight and suppresses the middle drop while maintaining good narrow-angle control using only a moving lens without using a fixed lens. FIG. 43 is a perspective view of a lighting device 401 according to the fourth embodiment of the present disclosure. This illumination device 401 is a spotlight, and includes a power supply section 405 that also serves as a mounting section, a support section 408 and a main body section 415 . The power supply unit 405 is attached to a wiring duct (not shown). The power supply section 405 has a housing section 406 and a power supply circuit (not shown) housed in the housing section 406 . AC power from an external power supply such as a commercial power supply is supplied to the power supply circuit through a wiring duct. The power supply circuit converts the AC power into DC power by, for example, rectifying or smoothing the supplied AC power, and supplies the converted DC power to the light source described later. Further, the support portion 408 is attached, for example, to one end portion in the longitudinal direction of the elongated accommodation portion 406 and extends in a direction substantially orthogonal to the longitudinal direction. The body portion 415 incorporates a light source 422 (see FIG. 44). The body portion 415 is attached to the support portion 408 so that the optical axis direction of the light emitted from the light source 422 can be changed.

44 is an exploded perspective view of the main portion 420 of the body portion 415. FIG. As shown in FIG. 44, main portion 420 includes housing 410, moving lens 460, lens holder 470, rotating member 480, C-shaped retaining ring 494, and hood 495. As shown in FIG. A housing 410 has an outer cylindrical member 411 and an inner member 412 . The inner member 412 is arranged on the outer cylinder member 411 from the opposite side of the outer cylinder member 411 to the light emission side in the Z direction. The end surface of the inner member 412 on the light emitting side in the Z direction is an inner annular flange that is provided on the light emitting side in the Z direction of the outer cylinder member 411 and protrudes radially inward from the inner peripheral surface of the outer cylinder member 411 . It is fixed to the upper end face in the Z direction of the portion 411a. For this fixing, bolts 435 and screw holes 411b provided in the inner annular flange portion 411a are used.

As shown in FIG. 44, the light source module 425 is fixed to the central portion of the end face of the inner member 412 on the light emitting side in the Z direction. A moving lens 460, a lens holder 470, and a rotating member 480 are assembled to form a moving lens assembly 475, as shown in FIG. 45, in the same manner as in the third embodiment. Further, the rotary member 480 has a plurality of protrusion insertion holes 498 spaced apart in the θ direction. The protrusion 494 a of the C-shaped retaining ring 494 is inserted through the protrusion insertion hole 498 , and the C-shaped retaining ring 494 is assembled to the moving lens assembly 475 by the insertion thereof. The distal end side of the protruding portion 494a protrudes outward in the R direction from the outer peripheral surface of the rotating member 480. As shown in FIG. By accommodating the distal end side of the projecting portion 494a in a circumferentially extending groove 485 (see FIG. 44) provided in the inner peripheral surface of the outer cylindrical member 411 and extending in the θ direction, the housing 410 and the moving lens can be moved. Assembly 475 and C-shaped retaining ring 494 are integrated and integrated. The hood 495 is a cylindrical member and is locked to the movable lens assembly 460 using a spring member (not shown), for example. The hood 495 plays a role such as limiting the irradiation area of the emitted light.

46 is a perspective view of the moving lens 460 as seen from above in the Z direction, and FIG. 47 shows a state in which the inner member 412 to which the light source module 425 is fixed is being fixed to the outer cylindrical member 411. 4 is a perspective view of the cylindrical member 411 as seen from below in the Z direction. FIG. 48 is a perspective view of the lens holder 470. FIG. As shown in FIG. 46, the moving lens 460 has an annular Fresnel 469 protruding upward in the Z direction, like the moving lens 360 of the third embodiment. Also, although not shown, similarly to the moving lens 360, the reflecting surface 434 of the moving lens 460 includes an inner convex area convex on the optical axis X side and an outer convex area convex on the opposite side to the optical axis X. Reflective surface 434 is included in narrow-angle drop-off improvement means.

Further, as shown in FIG. 47, the housing 410 has one or more columnar portions 450 provided on the inner wall surface 491 of the light source housing chamber 490 housing the light source 422 and extending in the Z direction. It has a plurality of columnar portions 450 as in this embodiment. Also, as shown in FIG. 48, the lens holder 470 has an annular portion 471 and one or more legs 472, preferably a plurality of legs 472 as in the present embodiment.

The leg portion 472 is an example of a circumferential movement restricting portion and extends upward in the Z direction from the annular portion 471 . The plurality of columnar portions 450 and the plurality of leg portions 472 are arranged at intervals in the θ direction. The leg portion 472 has a locking surface 477 that opens outward in the R direction and in the vertical direction in the Z direction on the outer surface on the outer side in the R direction. By locking the columnar portion 450 to the locking surface 477 of the leg portion 472 so as to be relatively movable in the Z direction, the lens holder 470 is prevented from rotating along with the housing 410 in the circumferential direction.

As described above, in the lighting device 401 as well, similarly to the lighting device 301 of the third embodiment, the moving lens 460 is annularly formed around the optical axis and includes the reflecting surface 434 included in the narrow-angle drop improving means. In addition, the reflecting surface 434 includes an inner convex region that is convex toward the optical axis and an outer convex region that is convex toward the side opposite to the optical axis.

Therefore, it is easy to achieve both good narrow-angle characteristics and suppression of the dropout in the middle, and it is easy to emit the light from the light source 422 to the irradiation area without loss.

Moreover, it is preferable that the illumination device 401 also satisfies the following multiple configurations, like the illumination device 301 of the third embodiment.

Specifically, the moving lens 460 may have one or more annular Fresnels 469 protruding in the Z direction opposite to the light exit side. In addition, the illumination device 401 holds the moving lens 460, is arranged outside the moving lens 460 in the R direction, and contacts the housing 410 to limit the movement range of the moving lens 460 in the circumferential direction. A lens holder 470 including the above leg portion (circumferential movement restricting portion) 472 may be provided. In addition, the height of the Fresnel 469 having the highest height in the Z direction among the one or more annular Fresnels 469 is the Z direction of the leg 472 having the highest height in the Z direction among the one or more legs 472 . may be lower than the height of

According to this configuration, the moving range of the moving lens 460 in the Z direction can be increased. Among the one or more annular Fresnels 469, the Fresnel 469 having the highest height in the Z direction has the lowest height in the Z direction among the one or more legs 472. may be lower than the height of

Further, the housing 410 may have one or more columnar portions 450 extending substantially in the Z direction on an inner wall surface 491 that defines a light source housing chamber 490 that houses the light source 422 . In addition, the lens holder 470 has an annular portion 471, and a locking surface 477 ( A leg portion 472 having a locking portion) may also be used. The height of the leg portion 472 having the highest height in the Z direction among the one or more legs 472 is higher than the height of the columnar portion 450 having the highest height in the Z direction among the columnar portions 450 having one or more. It can be expensive.

According to this configuration, a larger area in the height direction of the columnar portion 450 can be supported by the leg portion 472 and can be supported. Therefore, rattling of the moving lens 460 can be suppressed.

Further, the housing 410 may have a plurality of columnar portions 450 and the lens holder 470 may have a plurality of leg portions 472 .

According to this configuration, it is possible to prevent the optical axis of the movable lens 460 from being displaced with respect to the light source when the movable lens 460 is moved. Therefore, it becomes easier to emit irradiation light in a desired direction.

In addition, the illuminating device 401 moves the moving lens 460 relative to the housing 410 in a state where the inner wall surface 491 defining the light source housing chamber 490 housing the light source 422 in the housing 410 has substantially the same height position in the Z direction. A rotating member 480 may be provided that is relatively rotatable in a direction. Further, the rotating member 480 may have an inclined groove (spiral groove) 481 (see FIG. 45). The lens holder 470 has fitting claws (engaging portions) 478 that fit into the inclined grooves 481, and the movable lens 460 rotates about the optical axis while continuing in the Z direction inside the housing 410. may be physically movable.

According to this configuration, the light distribution can be changed continuously, and the desired illumination light can be easily set.

Moreover, the surface reflectance of the housing 410 may be 15% or less.

According to this configuration, it is possible to suppress the light that becomes uncontrollable due to reflection on the inner peripheral surface of the housing 410, and it is possible to suppress the disturbance of the light distribution of the irradiation light.

Moreover, the surface reflectance of the housing 410 may be 70% or more.

According to this configuration, it is possible to prevent heat from accumulating in the housing 410 and to prevent heat deterioration of the housing 410 .

Also, the following configuration may be employed to increase instrument efficiency. 49 is a perspective view for explaining the relative position of the light source module 425 with respect to the moving lens 460, and is a perspective view when the moving lens 460 and the light source module 425 are viewed obliquely below the moving lens 460. FIG. 50 is a perspective view for explaining the relative position of the light source module 425 with respect to the moving lens 460, and is a plan view when the moving lens 460 and the light source module 425 are viewed from above in the Z direction. As shown in FIG. 49, the light source 422 of the light source module 425 may have a disk shape. 49 and 50, when viewed from the Z direction, all of the light source modules 425 overlap the region surrounded by the ring-shaped Fresnel 469 of the moving lens 460, and the central axis of the light source 422 is aligned with the Fresnel 469. may substantially coincide with the central axis of That is, of the one or more annular Fresnels 469 , the innermost Fresnel 469 located on the innermost side in the R direction of the moving lens 460 has an inner diameter at the end opposite to the light emission side in the Z direction, which is larger than the outer diameter of the light source 422 . It can be big.

According to this configuration, among the light emitted from the light source 422, the amount of light incident on the innermost side in the R direction relative to the innermost Fresnel 469 can be increased. can be reduced and instrument efficiency can be increased.

(Other embodiments)
In the first and second embodiments and their modifications, a case will be described in which good narrow angle control and suppression of center drop are achieved by mounting fixed lenses 40 and 148 in addition to moving lenses 60 and 163. bottom. In addition, in the third and fourth embodiments and their modifications, instead of mounting a fixed lens, the movable lenses 360 and 460 have a special shape, so that good narrow-angle control and suppression of dropouts are achieved. A case of realizing In addition, in the third and fourth embodiments, regarding the member dimensions indicated by H1 to H3 and the member dimensions indicated by L1 and L2 in FIG. 42, a preferable size relationship is defined. However, in the illumination device having the movable lenses 360 and 460 described in the third and fourth embodiments, the size relationship between the member dimensions may not be established.

Also, just to make sure, the magnitude relationship established between the member dimensions described in the third and fourth embodiments is the same as the lighting device described in the first embodiment and the lighting device described in the second embodiment. It may or may not be established with the apparatus or the lighting apparatus of the modifications of the first and second embodiments. In addition, in the illumination device having the moving lenses 360 and 460 described in the third and fourth embodiments, the surface reflectance of the housing may not be 15% or less, or the surface reflectance of the housing may be 70%. It doesn't have to be that much. Further, even if the lighting devices of the first and second embodiments and their modifications have the structure described in the third and fourth embodiments in which the surface reflectance of the housing is 15% or less, Well, you don't have to. Alternatively, even if the lighting devices of the first and second embodiments and their modifications have the configuration in which the surface reflectance of the housing is 70% or more, as described in the third and fourth embodiments. Well, you don't have to.

Further, in the illumination device having a fixed lens and a moving lens, the moving lens may be the moving lens having the inner convex region and the outer convex region described in the third and fourth embodiments. A moving lens that does not have both is also possible. Also, any configuration adopted for the downlights, which are the lighting devices 1, 301 of the first and third embodiments, can be adopted for the spotlights, which are the lighting devices 101 and 401 of the second and fourth embodiments. may Conversely, any configuration employed in the spotlights, which are the lighting devices 101 and 401 of the second and fourth embodiments, can also be applied to the downlights, which are the lighting devices 1 and 301 of the first and third embodiments. may be adopted for

In addition, in the lighting device of the present disclosure, the output of the light emitting unit (eg, light emitting element (eg, LED)) may be any output. However, by providing an inner convex region 334a and an outer convex region 334b on the reflecting surface 334 of the moving lens 360 without having a fixed lens as in the illumination devices 301 and 401, the center drop can be suppressed and the narrow angle can be controlled satisfactorily. The configuration to be executed is preferably mounted on a high-output product having a light-emitting unit (for example, LED) output of 15 W (watts) or more. In addition, as in the lighting devices 1 and 101, by providing a fixed lens and a moving lens, a configuration that performs center drop suppression and good narrow angle control has an output of 15 W (watts) of the light emitting unit (for example, LED). It is preferable to be mounted on a low-output product smaller than .

(Lighting device with beneficial effects)
In the third and fourth embodiments, the plurality of magnitude relationships described with respect to the member dimensions indicated by H1 to H3 and the member dimensions indicated by L1 and L2 in FIG. In order to prevent rattling and increase the efficiency of the equipment, it was preferable to establish it. Therefore, in comparison with the illumination devices of the third embodiment, the fourth embodiment, and their modifications, the only difference is that the moving lens is changed to a moving lens that does not have both an inner convex region and an outer convex region. Even if a different illumination device is manufactured, it is possible to increase the moving range of the moving lens, prevent the moving lens from wobbling, and increase the efficiency of the device. Therefore, in comparison with each of the illumination devices of the third embodiment, the fourth embodiment, and their modifications, the moving lens is changed to a moving lens that does not have both an inner convex region and an outer convex region. Lighting devices that are different only (for example, downlights, spotlights, etc.) can provide the beneficial effects described in the third and fourth embodiments. As a reminder, it goes without saying that such an illumination device does not have a fixed lens.

1,101,301,401 Lighting device 10,130,310,410 Housing 21,142,321 Substrate 22,143,322,422 Light source 30,145,330 Substrate holder 40,148 Fixed lens 41,141 body of fixed lens 53,54,153,154 holding part 60,163,360,460 moving lens 69,169,369,469 fresnel of moving lens 69a,169a inner peripheral surface of fresnel 76 , 176 end surface of moving lens 77, 177 concave portion of moving lens 83 light incident surface 85 inner peripheral surface 86 light incident surface 87 light projecting surface 88 light emitting surface 310a first member of housing 310b housing Second member of body 334,434 reflective surface of moving lens 334a inner convex region 334b outer convex region 350,450 column 370,470 lens holder 371,471 annular portion 372,472 leg 377 , 477 locking surface 378,478 engaging claw 380,480 rotating member 381,481 inclined groove 385 circumferentially extending groove 390,490 light source housing chamber 391,491 inner wall surface of light source housing chamber 394 , 494 C-shaped snap ring 394a, 494a projection 405 power source 406 housing 408 support 415 body H1 highest fresnel height H2 highest leg height H3 highest column height of part P vertical plane L1 inner diameter of upper end of Fresnel L2 outer diameter of disk-shaped light source S1 second projected area S2 first projected area S21 third projected area S22 fourth projected area S31 Fifth projected area S32 Sixth projected area X-axis Optical axis of moving lens.

Claims (21)

a housing;
a light source that is fixed in the housing and emits light;
a fixed lens that is fixed in the housing and has a light exit surface that is located on the light exit side of the light source in the optical axis direction;
a moving lens having a light projecting surface arranged closer to the light exit side in the optical axis direction than the fixed lens, and having a variable distance from the light source in the optical axis direction;
the light incident surface of the fixed lens is substantially flat, while the light exit surface is convex;
The illumination device, wherein a first projected area of the orthogonal projection of the fixed lens with respect to a vertical plane perpendicular to the optical axis direction is equal to or larger than a second projected area of the orthogonal projection of the light source with respect to the vertical plane. A third projected area of the orthogonal projection of the light incident surface with respect to the vertical plane is smaller than a fourth projected area of the orthogonal projection of the light exit surface with respect to the vertical plane, and the second projected area is equal to the third projected area. 2. The lighting device of claim 1 , smaller than . a fifth projected area of an orthographic projection of the light incident surface on the light source side in the optical axis direction of the movable lens with respect to the vertical plane is smaller than a sixth projected area of an orthographic projection of the light projection surface with respect to the vertical plane;
3. The illumination device of claim 2 , wherein the fourth projected area is smaller than the fifth projected area. The lighting device according to any one of claims 1 to 3 , wherein the distance in the optical axis direction between the light source and the light incident surface is 1.5 mm or less. 5. The illumination device according to any one of claims 1 to 4 , wherein the arithmetic mean roughness of the light entrance surface is smaller than the arithmetic mean roughness of the light exit surface. 6. An illumination device according to any one of the preceding claims, wherein the fixed lens has a Shore (A) hardness of 50-90 . 7. A lighting device according to any one of the preceding claims, wherein said fixed lens is composed of a silicone material comprising silicone. a substrate for fixing the light source;
a substrate holder for fixing the substrate to the housing,
The fixed lens includes a main body that is substantially circular in plan view when viewed from the optical axis direction, and a pair of holding portions projecting in the radial direction from edges of the main body so as to face each other in the radial direction of the main body. have
The lighting device according to any one of claims 1 to 7 , wherein the holding part is directly fixed to the substrate holder, or indirectly fixed to the substrate holder via another member. The fixed lens includes a main body that is substantially circular in plan view when viewed from the optical axis direction, and a pair of holding portions projecting in the radial direction from edges of the main body so as to face each other in the radial direction of the main body. have
9. The illumination device according to any one of claims 1 to 8 , wherein the transmittance of the body is higher than the transmittance of the holding part. 10. An illumination device according to any one of the preceding claims, wherein the refractive index of the fixed lens is smaller than the refractive index of the moving lens. having an inner peripheral surface arranged to surround the moving lens;
The inner peripheral surface includes a low-reflectance inner surface portion located on the light emission side of a position where the moving lens is most moved toward the light source in the optical axis direction and having a light reflectance of 15% or less. Item 10. The illumination device according to any one of Items 1 to 10 . the moving lens has an annular Fresnel projecting toward the light source in the optical axis direction;
1. An arrangement is possible in which all of said fixed lenses are housed in a recess defined by an inner peripheral surface of said annular Fresnel and an end face of said moving lens on the light source side in said optical axis direction. 11. The illumination device according to any one of 11 . a housing;
a light source that is fixed in the housing and emits light;
a moving lens whose distance in the optical axis direction from the light source is variable;
Suppressing the illuminance of the illumination light emitted from the moving lens at the central portion of the illumination surface on the illumination surface being lower than the illumination intensity at the peripheral portion, and reducing the narrow-angle characteristics that reduce the area of the illumination surface of the illumination light. and a narrow-angle drop improving means capable of suppressing
the moving lens has a reflecting surface formed annularly around the optical axis and included in the narrow-angle drop improving means;
The lighting device, wherein the reflecting surface includes an inner convex region that is convex toward the optical axis and an outer convex region that is convex toward the side opposite to the optical axis. the moving lens has one or more annular fresnels protruding on the side opposite to the light exit side in the optical axis direction;
One or more circumferential movement limiters that hold the movable lens, are arranged radially outward of the movable lens, and limit the movement range of the movable lens in the circumferential direction by coming into contact with the housing. with a lens holder containing
The fresnel having the highest height in the optical axis direction among the one or more annular fresnels has the highest height in the optical axis direction among the one or more circumferential movement restricting portions. The lighting device according to any one of claims 1 to 13 , wherein the height of the circumferential movement restricting portion in the optical axis direction is lower than that of the circumferential movement restricting portion. The housing has one or more columnar portions extending substantially in the optical axis direction on an inner wall surface defining a light source housing chamber for housing the light source,
the lens holder has an annular portion,
wherein the circumferential movement restricting portion is a leg portion that protrudes from the annular portion in a direction opposite to the light emitting side in the optical axis direction and includes a locking portion that locks the columnar portion;
Among the one or more leg portions, the height of the leg portion having the highest height in the optical axis direction is the height of the columnar portion having the highest height in the optical axis direction among the one or more columnar portions. 15. A lighting device according to claim 14 , wherein the height is higher than the height. the housing has a plurality of the columnar portions,
16. The illumination device of claim 15 , wherein said lens holder has a plurality of said legs. An inner wall surface defining a light source housing chamber for housing the light source in the housing is rotatable relative to the housing in a circumferential direction of the moving lens in a state in which a height position in the optical axis direction does not substantially change. and a rotating member having a helical groove,
The lens holder has a fitting portion that fits into an annular groove, and the moving lens can continuously move in the optical axis direction in the housing while rotating about the optical axis. 17. A lighting device according to any one of claims 14 to 16 . The housing has a guide portion on the inner wall surface that guides the rotating member movably in the circumferential direction,
a guide locking portion that locks to the guide portion so as to be relatively movable in the circumferential direction;
The lighting device according to claim 17 , wherein the housing has a structure that can be divided into a plurality of members. 19. The lighting device according to any one of claims 1 to 18 , wherein the housing has a surface reflectance of 15% or less. 19. The lighting device according to any one of claims 1 to 18 , wherein the housing has a surface reflectance of 70% or more. the moving lens has one or more annular fresnels protruding on the side opposite to the light exit side in the optical axis direction;
the light source has a disk-like shape,
Among the one or more annular Fresnels, the innermost Fresnel positioned radially inwardly of the moving lens has an inner diameter at an end opposite to the light emission side in the optical axis direction, which is larger than the outer diameter of the light source. 21. A lighting device according to any one of claims 1 to 20 , which is large.

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