JP6975940B2 - Lighting equipment - Google Patents

Description

The present disclosure relates to a lighting device.

Conventionally, as a lighting device, there is one described in Patent Document 1. This lighting device includes a light source arranged in a housing and a lens that distributes the light emitted by the light source. The lens is made of glass, clear acrylic resin, or polycarbonate.

Japanese Patent No. 6094623

Since the lens is arranged in the lighting device, its outer diameter needs to be designed to be smaller than the inner diameter of the inner peripheral surface of the light emitting side of the housing of the lighting device. Therefore, a lens fixing member for fixing the lens to the inner peripheral surface is required. In addition, since the lens tends to fall downward, it is necessary to install a fall prevention member on the light emitting side of the lens to prevent the lens from falling. Therefore, the number of parts of the lighting device increases, and the manufacturing cost of the lighting device tends to increase. Further, since the outer diameter of the lens is smaller than the inner diameter of the inner peripheral surface on the light emitting side of the housing, a gap is likely to occur between the lens and the inner peripheral surface, and dust and insects are light sources through the gap. Easy to invade the side. As a result, when the lighting device is lit, shadows due to the dust and insects are likely to be generated on the irradiated surface, and the shadows deteriorate the lighting performance.

Therefore, an object of the present disclosure is to provide a lighting device that can easily reduce the number of parts and suppress the intrusion of foreign matter into the light source side.

In order to solve the above problems, the lighting device according to the present disclosure includes a housing including an inner peripheral surface having a locking portion, a light source arranged in the housing and having a substrate and a light emitting element mounted on the substrate. It comprises an incoming light portion through which light from a light source enters and an optical member having a light projecting portion that projects light, and the light projecting portion projects outward in the radial direction and is locked to a locking portion. The annular support portion is included on the outer peripheral side, and the outer diameter of the annular support portion is larger than the inner diameter of the inner peripheral surface of the housing and smaller than the outer diameter of the outer peripheral surface of the housing. In the lighting device of the present disclosure, the annular support portion is included in the light projection portion. However, a part or all of the annular support portion does not have to be able to project light onto the irradiation area. Further, it is not necessary to cast light on a part or all of the annular support portion.

According to the lighting device according to the present disclosure, it is easy to reduce the number of parts, and it is possible to suppress the intrusion of foreign matter into the light source side.

It is a perspective view of the main part of the lighting apparatus which concerns on one Embodiment of this disclosure. It is an exploded perspective view of the main part of the said lighting apparatus. It is sectional drawing in the cut surface including the central axis of the said main part. It is a perspective view when the base of the said lighting apparatus is seen from the lower side. It is a perspective view when the holder which held the light source of the said lighting apparatus is seen from the upper side. It is a perspective view when the holder which held the said light source is seen from the lower side. It is a perspective view when the assembly composed of an inner cylinder member, a lens fall prevention member, and a lens is seen from the upper side. It is a perspective view when the said assembly is seen from the lower side. It is a partial schematic cross-sectional view of the said lighting apparatus for demonstrating the dimensional comparison relationship between the outer diameter φa of the tip of the annular support portion and the inner diameter φd of the annular groove in a lens in a single state.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. When a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the characteristic portions thereof. Further, in the following description and drawings, the R direction indicates the radial direction of the annular support portion 52 of the lens 50 described below, the θ direction indicates the circumferential direction of the annular support portion 52, and the Z direction indicates the illumination device. 1 indicates the height direction and coincides with the thickness direction of the substrate 21 shown below. The R, θ, and Z directions are orthogonal to each other. Further, in the following description, the central axis indicates a straight line including the central axis of the lens 60 (the central axis of the annular support portion 52 and its extension line). Further, in the following description, a case where the Z direction coincides with the optical axis direction of the light emitted from the light source 20 of the lighting device 1 will be described. However, the Z direction does not have to coincide with the optical axis direction emitted from the light source of the illuminating device. Further, in the following description, when words related to the vertical direction or the horizontal direction, for example, the lower side, the upper side, the horizontal direction, etc. are used, those words indicate that the light emitted from the lighting device 1 is on the lower side in the vertical direction. It is expressed in a state where it is irradiated and the optical axes of the emitted light coincide with each other in the vertical direction. In other words, in this embodiment, the case where the lighting device 1 is arranged so that the Z direction coincides with the vertical direction will be described as an example. Further, in the present specification, the lower side refers to the light emitting side in the Z direction, and the upper side means the side opposite to the light emitting side in the Z direction. Further, in the present specification, the silicone resin includes a material in which all the components are silicone resin, and also a silicone resin composition containing a material other than the silicone tree in which the main component having the largest weight% is silicone resin. It shall be included.

FIG. 1 is a perspective view of a main part of the lighting device 1 according to the embodiment of the present disclosure. With reference to FIG. 1, the lighting device 1 is an embedded downlight, which is embedded in the ceiling of a building such as a hall and illuminates the lower part. As shown in FIG. 1, the lighting device 1 includes a base 10 and a frame (not shown). The base 10 is an outer member of the lighting device 1 and has a bottomed cylindrical portion 11. The base 10 functions as a mounting base for mounting the light source 20 (see FIG. 5) in the bottomed cylindrical portion 11. The base 10 has a plurality of fins 12 projecting upward. The entire base 10 also functions as a heat sink that dissipates heat generated by the light source 20, and in particular, the fins 12 dissipate heat from the light source 20 to the outside air. Therefore, it is preferable that the base 10 is made of a material having high thermal conductivity such as a metal material. The base 10 is formed by integrally molding the bottomed cylindrical portion 11 and the fins 12 with, for example, aluminum die casting. The base may be configured to join the bottomed cylindrical portion and the fins. In this case, for example, the bottomed cylindrical portion and the fin may be connected by inserting the protrusion provided in the bottomed cylindrical portion into the hole provided in the fin and then plastically deforming the protrusion. The base does not have to have fins.

The base 10 is provided with a plurality of screw holes 13. These screw holes 13 are provided to fix the base to the frame body. The frame has a cylindrical outer peripheral surface and is preferably formed of a metal material such as aluminum or a resin material such as polybutylene terephthalate. Although not described in detail, two mounting springs (not shown) are mounted on the outer peripheral surface of the cylinder of the frame. The two mounting springs are arranged on the outside of the frame so as to face each other in the radial direction (corresponding to the R direction) with the central axis interposed therebetween, and are fixed to the outer peripheral surface of the cylinder of the frame with bolts or the like. Each mounting spring extends approximately horizontally in its pre-fixed state to the ceiling embedding hole. The mounting spring is composed of, for example, an elongated metal plate and has a leaf spring structure. The mounting spring is distorted so that the mounting spring extends in the vertical direction, and the mounting spring is brought into contact with the periphery of the embedding hole. The lighting device 1 is fixed to the inner surface of the embedded hole in the ceiling by the horizontal force received by the mounting spring from the inner surface of the embedded hole. In addition, three or more mounting springs may be provided. Further, the structure of the mounting portion may be any structure as long as the lighting device can be fixed to the ceiling.

Next, the schematic configuration of the main part of the lighting device 1 and its assembly structure will be described with reference to FIGS. 2 to 8. FIG. 2 is an exploded perspective view of the main part of the lighting device 1, and FIG. 3 is a cross-sectional view of a cut surface including the central axis of the main part. As shown in FIG. 2, the lighting device 1 includes a base 10, an inner cylinder member 30, a lens fall prevention member 40, and a lens 50 as an example of an optical member. As shown in FIGS. 2 and 3, the lens 50 includes a substantially truncated cone-shaped outer peripheral surface portion 51 and an annular support portion 52, and the annular support portion 52 is located on the lower side (light projection side) of the outer peripheral surface portion 51. It will be provided. The annular support portion 52 has an annular flange structure and projects outward in the R direction on the lower side of the lens 50. The lens 50 is attached to the inner peripheral surface side of the base 10. The material and physical properties of the lens 50 and the mounting structure of the lens 50 with respect to the base 10 will be described in detail later.

As shown in FIG. 3, the inner cylinder member 30 is arranged between the outer peripheral surface portion 51 of the lens 50 and the inner peripheral surface 15 of the base 10. A locking claw 31 is provided on the upper tip portion of the inner cylinder member 30, and an engaging recess 16 for locking the locking claw 31 is provided on the inner peripheral surface 15 of the base 10. By locking the locking claw 31 to the engaging recess 16, the inner cylinder member 30 is attached to the base 10.

Further, the lens fall prevention member 40 is attached to the lower side of the lens 50. The lens fall prevention member 40 is a tubular member and has a locking claw 41 protruding outward in the R direction on the outer peripheral side. The locking claw 41 is locked to the engaging recess 17 provided on the lower side of the inner peripheral surface of the base 10, and as a result, the lens fall prevention member 40 is on the inner peripheral side and the lower side of the base 10. Attached to.

Next, the light source 20 of the lighting device 1, its mounting structure, and the assembly structure of the lighting device 1 will be described. FIG. 4 is a perspective view of the base 10 when viewed from below. Further, FIG. 5 is a perspective view of the holder 35 holding the light source 20 when viewed from above, and FIG. 6 is a perspective view of the holder 35 holding the light source 20 when viewed from below.

As shown in FIG. 4, the main surface 18 of the base 10 is provided with a concave-convex structure 19 and a screw hole 5 corresponding to the upper shape of the holder 35 holding the light source 20. Further, as shown in FIG. 6, the light source 20 has a substrate 21 and a light emitting unit 22. The substrate 21 has a substantially square shape in a plan view, and the light emitting portion 22 has a disk-like shape. The light emitting unit 22 is arranged substantially in the center of the lower surface (mounting surface) of the substrate 21. The light source 20 has, for example, a COB (Chip On Board) structure, and the light emitting unit 22 includes a plurality of LEDs (light emitting diodes) mounted on the substrate 21 and a sealing member for sealing 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, a pair of electrode terminals and a predetermined pattern of metal wiring are formed on the substrate 21. The pair of electrode terminals are provided to receive DC power for causing the LED to emit light from the outside. Further, the metal wiring of a predetermined pattern is provided to electrically connect the LEDs to each other.

The LED is an example of a light emitting element. The LED is composed of, for example, a bare chip that emits visible light of a single color, and is composed of a blue LED chip that emits blue light when energized. The plurality of LEDs are arranged in a matrix on the substrate 21, for example. Only one LED may be mounted on the board. The sealing member is made of, for example, a translucent resin and contains a fluorescent substance. The phosphor serves to wavelength-convert the light from the LED. The sealing member is composed of, for example, a phosphor-containing resin in which fluorescent particles are dispersed in a silicone resin. When the light source 20 is a blue LED chip that emits white light and the LED emits blue light, the phosphor particles are composed of, for example, a YAG-based yellow phosphor. As the sealing member, for example, all the LEDs may be collectively sealed, a plurality of LEDs may be sealed in a line for each row, or each LED may be individually sealed one by one. ..

As shown in FIG. 6, the holder 35 has a substrate receiving portion 36 that overlaps with the substrate 21 when viewed from the Z direction, and the substrate receiving portion 36 is located below the substrate 21. The lower surface of the substrate 21 is supported by the upper surface of the substrate receiving portion 36. As shown in FIG. 5, the holder 35 includes a recess having an opening 37 having a shape corresponding to the shape of the upper surface of the substrate 21. The light source 20 is housed in the recess until the lower surface of the substrate 21 comes into contact with the substrate receiving portion 36, and then the substrate detachment prevention member 38 is placed on the substrate so that a part thereof overlaps the substrate 21 when viewed from the Z direction. Place it above 21. After that, the plurality of bolts 8 are tightened from the lower side of the holder 35 into the holder 35, the substrate detachment prevention member 38, and the screw holes 5 of the base 10. By tightening the bolt 8, the holder 35 holding the light source 20 is attached to the main surface 18 of the base 10.

FIG. 7 is a perspective view of an assembly composed of an inner cylinder member 30, a lens fall prevention member 40, and a lens 50 when viewed from above, and FIG. 8 is a perspective view of the assembly when viewed from below. It is a perspective view. As shown in FIG. 7, the lens 50 has a bottomed cylindrical hole 53 on the upper side, and the cylindrical hole 53 has an opening 55 having a substantially circular edge on the upper side. The diameter of the opening 55 is larger than the diameter of the disk-shaped light emitting portion 22 (see FIG. 6). When the inner cylinder member 30, the lens fall prevention member 40, and the lens 50 are attached to the inner peripheral side of the base 10, the assembly of the lighting device 1 is completed. When the assembly of the lighting device 1 is completed, the light emitting unit 22 is housed in the cylindrical hole 53, and the opening 55 is closed by the lower surface of the substrate 21 of the light source 20. As a result, the light emitted from the light emitting unit 22 is incident on the lens 50 without leaking.

The inner peripheral surface and the bottom surface of the cylindrical hole 53 of the lens 50 form an incoming light portion through which light from the light source 20 enters. Specifically, as shown in FIG. 8, the lens 50 is a Fresnel lens having a sawtooth cross section. The lens 50 has a structure divided into a plurality of concentric regions, and the thickness is smaller than that of a normal lens. The lower surface of the lens 50 constitutes a light projecting unit that projects light emitted from the light source 20 and passed through the lens 50. The annular edge portion located on the outer peripheral side of the floodlight portion constitutes the annular support portion 52 (see FIG. 2). Again, with reference to FIG. 3, the base 10 constitutes a housing. Further, the lens 50 is locked and fixed to the base 10. Specifically, as shown in FIG. 3, the base 10 has an annular groove 7 as an example of a locking portion, and the annular groove 7 opens only inside the R direction inward in the R direction.

FIG. 9 is a partial schematic cross-sectional view for explaining a dimensional comparison relationship between the outer diameter φa of the annular support portion 52 and the inner diameter φd of the annular groove 7 in the lens 50 in a single state. As shown in FIG. 9, when the lens 50 exists alone, the outer diameter φa of the annular support portion 52 of the lens 50 is the inner diameter φb of the inner peripheral surface portion where the annular groove 7 is not provided in the base 10. It is larger than the outer diameter φc of the outer peripheral surface of the base 10. Further, the inner diameter φd of the bottom portion 9 of the annular groove 7 is smaller than the outer diameter φa of the annular support portion 52 in the lens 50 in a single state.

The lens 50 is made of a transparent silicone resin (silicone rubber) having translucency. The lens 50 preferably has a light transmittance of 85% or more, preferably 90% or more at a wavelength of 550 nm and a wall thickness of 1 mm, but is not limited to this. Further, when the shore (A) hardness is the hardness specified by JIS K6253 (2012) and JIS K7215 (1986), the lens 50 is a rubber elastic body having a shore (A) hardness of 50 to 90. It is configured. As a result, the lens 50 has elasticity and can be distorted unlike a hard lens made of acrylic or a hard lens made of polycarbonate.

The lens 50 is inserted from the lower side to the upper side of the base 10 in a state of being compressed so that the outer diameter of the annular support portion 52 becomes small, and is press-fitted into the inner peripheral surface of the base 10. The press-fitting is performed until the annular support portion 52 is fitted into the annular groove 7. Since the lens 50 has elasticity, the lens 50 is not damaged by this press fitting. Further, as described above, the inner diameter of the bottom portion 9 of the annular groove 7 is shorter than the outer diameter of the annular support portion 52 in the single lens 50. As a result, with the annular support portion 52 fitted in the annular groove 7, the tip portion of the annular support portion 52 on the outer side in the R direction is pressed inward by the bottom portion 9 of the annular groove 7 and compressed. This compression prevents a gap from being created between the annular support portion 52 and the bottom portion 9 of the annular groove 7, and the space defined by the outer peripheral surface portion 51 of the lens 50 and the inner peripheral surface of the base 10 is open to the outside. Is sealed.

The lens 50 is attached to the inner peripheral side of the base 10 by locking the annular support portion 52 to the annular groove 7. After fixing the lens 50 to the base 10, the lens fall prevention member 40 is attached to the lower side of the lens 50 in the base 10. When viewed from the Z direction, the lens fall prevention member 40 has a portion that overlaps with the lens 50. With this configuration, even if the lens 50 falls due to some problem, the dropped lens 50 can be received by the lens fall prevention member 40. In this way, the lens 50 is prevented from falling by the double fall prevention mechanism, and safety is ensured. The lens fall prevention member 40 may be omitted. In this case, the number of parts can be omitted and the manufacturing cost can be reduced. Further, by coloring the inner peripheral surface of the lens fall prevention member 40 with gray or black, it is possible to suppress the reflection of light on the inner peripheral surface and suppress the glare when a person looks at the lighting device 1 from below. Is preferable.

As described above, the lighting device 1 has a base 10 of a housing including an inner peripheral surface having an annular groove (locking portion) 7, and an LED (light emitting element) arranged in the housing and mounted on the substrate 21 and the substrate 21. ) Is provided with a light source 20. Further, the lighting device 1 includes a lens 50 having a light input unit into which light from the light source 20 enters and a light projection unit in which light is projected. Further, the light projecting portion includes an annular support portion 52 projecting outward in the R direction and being locked to the annular groove 7 on the outer peripheral side. Further, the outer diameter of the annular support portion 52 is larger than the inner diameter of the inner peripheral surface of the base 10 and smaller than the outer diameter of the outer peripheral surface of the base 10.

According to the above configuration, since the outer diameter φa of the annular support portion 52 of the lens 50 is larger than the inner diameter φb of the inner peripheral surface of the base 10, the lens 50 can be independently fixed to the inner peripheral side of the base 10. Therefore, a lens fixing member for fixing the lens 50 to the base 10 is not required. Further, as described above, the lens fall prevention member 40 that prevents the lens 50 from falling can be omitted. Therefore, the number of parts of the lighting device can be reduced, and the manufacturing cost of the lighting device 1 can be reduced.

Further, since the outer diameter φa of the annular support portion 52 of the lens 50 is larger than the inner diameter φb of the inner peripheral surface of the base 10, there is a gap between the annular support portion 52 of the lens 50 and the inner peripheral surface of the base 10. Is less likely to occur. Therefore, it becomes difficult for dust and insects to enter the space defined by the outer peripheral surface portion 51 of the lens 50 and the inner peripheral surface of the base 10, and shadows due to dust and insects are generated on the irradiation surface when the lighting device 1 is lit. Hateful. Therefore, it is possible to suppress the deterioration of the lighting performance due to the shadow, and it is possible to improve the cleanliness.

Further, the lens 50 may be made of a rubber elastic body having a shore (A) hardness of 50 to 90.

According to the above configuration, the lens 50 is easily elastically deformed. Therefore, the lens 50 can be easily press-fitted, and the lens 50 can be easily and surely attached to the base 10.

Further, the locking portion may be an annular groove 7 provided on the inner peripheral surface of the base 10 over the entire circumference.

According to the above configuration, the annular support portion 52 can be easily, inexpensively and reliably fixed to the base 10. Further, the Z-direction position of the annular support portion 52 can be precisely positioned at the Z-direction position of the annular groove 7. Further, a maze structure (labyrinth structure) can be formed between the annular groove 7 and the annular support portion 52. Therefore, this maze structure can effectively suppress the invasion of insects into the lighting device 1.

Further, the inner diameter of the bottom portion 9 of the annular groove 7 may be shorter than the outer diameter of the annular support portion 52 in the lens 50 in a single state.

According to the above configuration, the annular support portion 52 comes into contact with the bottom portion 9 of the annular groove 7 in a state of being compressed by the tightening margin. Therefore, it is possible to prevent a gap from being formed between the tip end portion of the annular support portion 52 and the inner peripheral surface of the housing (base) 10, and it is possible to prevent insects and dust from entering the inside of the lighting device 1. Therefore, the phenomenon that shadows are formed on the irradiated surface due to the invasion of dust and insects can be substantially prevented or prevented, and the feeling of cleanliness can be improved.

The present disclosure is not limited to the above-described embodiment and its modifications, and various improvements and changes can be made within the scope of the claims of the present application and the equivalent scope thereof.

For example, in the above embodiment, the locking portion provided on the inner peripheral side of the housing is the annular groove 7, and the tip end portion of the annular support portion 52 is compressed inward in the R direction by the bottom portion 9 of the annular groove 7. The case was explained. However, the locking portion provided on the inner peripheral side of the housing is an annular groove, and the tip portion of the annular support portion accommodated in the annular groove faces the bottom portion of the annular groove at an interval in the R direction. It may be configured to be used. Alternatively, the locking portion provided on the inner peripheral side of the housing may be a substantially annular non-annular groove. Alternatively, the locking portion provided on the inner peripheral side of the housing may be an annular protrusion or a substantially annular protrusion. Then, the annular support portion is elastically deformed and moved from the lower side to the upper side so as to overcome the annular protrusion or the substantially annular protrusion, and the lower surface of the annular support portion is the annular protrusion or the substantially annular protrusion. It may be configured to be placed (locked) on the upper surface of the.

Further, the case where the lens 50 is made of a silicone rubber elastic body having a shore (A) hardness of 50 to 90 and having translucency has been described. However, the lens may be made of a silicone rubber elastic body having a shore (A) hardness of 50 or less and having translucency, and a silicone rubber having a shore (A) hardness of 90 or more and having translucency. It may be composed of an elastic body. Alternatively, the lens may be made of a rubber elastic body having translucency other than the silicone rubber elastic body, and even in this case, the lens has a shore (A) hardness of 50 to 90 and is translucent. It is preferable that it is composed of a rubber elastic body other than the silicone rubber elastic body having.

Further, the case where the optical member is the lens 50 has been described. However, the optical member may be a translucent cover or the like that does not have a lens function. Further, the case where the lighting device 1 is an embedded light has been described. However, the lighting device may be suspended on rails or suspended on the ceiling. In short, the lighting device has a housing including an inner peripheral surface having a locking portion, a light source having a light emitting element arranged in the housing and mounted on the board, and light from the light source. The light source portion includes an optical member having a light source portion and a light projecting portion that emits light, and the light projecting portion has an annular support portion that projects outward in the radial direction and is locked to a locking portion on the outer peripheral side. Any type of lighting device may be used as long as the outer diameter of the annular support portion is larger than the inner diameter of the inner peripheral surface of the housing and smaller than the outer diameter of the outer peripheral surface of the housing.

1 lighting device, 7 annular groove, 9 bottom of annular groove, 10 base (part of housing), 20 light source, 21 substrate, 50 lens (optical member), 52 annular support, φa annular in single lens The outer diameter of the support, the inner diameter of the inner peripheral surface of the φb base, and the outer diameter of the outer peripheral surface of the φc base.

Claims (3)

A housing including an inner peripheral surface having a locking portion, and
A light source having a substrate and a light emitting element mounted on the substrate, which is arranged in the housing.
An optical member having a light input unit into which light from the light source enters and a light projecting unit in which the light is projected are provided.
The light projecting portion includes an annular support portion that protrudes outward in the radial direction and is locked to the locking portion on the outer peripheral side.
The outer diameter of the annular supporting portion, the larger than the inner diameter of the inner peripheral surface of the housing, and, rather smaller than the outer diameter of the casing outer peripheral surface,
The optical member, Shore (A) hardness is made of rubber elastic body 50 and 90, lighting device. A housing including an inner peripheral surface having a locking portion, and
A light source having a substrate and a light emitting element mounted on the substrate, which is arranged in the housing.
An optical member having a light input unit into which light from the light source enters and a light projecting unit in which the light is projected are provided.
The light projecting portion includes an annular support portion that protrudes outward in the radial direction and is locked to the locking portion on the outer peripheral side.
The outer diameter of the annular support portion is larger than the inner diameter of the inner peripheral surface of the housing and smaller than the outer diameter of the outer peripheral surface of the housing.
The locking portion is an annular groove provided over the entire circumference on the inner peripheral surface, lighting apparatus. The lighting device according to claim 2 , wherein the inner diameter of the bottom portion of the annular groove is shorter than the outer diameter of the annular support portion in the optical member in a single state.

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