JP6319680B2 - Light distribution lens for lighting equipment and lighting equipment - Google Patents

Description

  The present invention relates to a light distribution lens for a lighting fixture that is used in the lighting fixture and controls light distribution of light emitted from a light source, and a lighting fixture that uses the light distribution lens for the lighting fixture.

  As a conventional example, a light flux controlling member (light distribution lens) described in Patent Document 1 is illustrated. This light flux controlling member has a substantially circular planar shape when viewed from the optical axis direction, and a recess is formed on the incident surface side so as to be in close contact with the light emitting surface of the light emitting element.

  Further, the light flux controlling member has a light control emitting surface formed on the outer surface side thereof. The light control emission surface has a first emission surface located in a predetermined range with the optical axis as a center, and a second emission surface formed continuously around the first emission surface. Of these, the first emission surface has a smooth curved surface shape that is convex downward, and has a concave shape that is a part of a sphere. In addition, the second emission surface is formed in a substantially hollow disk shape that is formed continuously with the first emission surface and has a smooth convex curved surface, and its planar shape surrounds the first emission surface. Has been.

  According to the conventional light flux controlling member, the light flux emitted from the light emitting element can be efficiently and smoothly spread over a wide range.

JP 2006-92983 A

  By the way, for example, when the above-described light flux control member (light distribution lens) is used for a ceiling-embedded lighting fixture, in order to obtain a desired light distribution, the light control exit surface of the light flux control member is placed indoors from the ceiling. It needs to protrude. Therefore, when viewed from the indoor side, a part of the light flux controlling member protrudes from the ceiling, resulting in a problem that the appearance is not good.

  The present invention has been made in view of the above problems, and an object of the present invention is to distribute light emitted from a light source at a wide angle while suppressing deterioration in appearance.

The light distribution lens for a lighting apparatus of the present invention includes an incident surface on which light emitted from a solid light emitting element is incident, and a mortar-shaped exit surface having a smaller diameter than the incident surface and recessed toward the incident surface. A side surface connecting the periphery of the incident surface and the periphery of the exit surface is formed into a three-dimensional shape that is a reflective surface that reflects light incident from the incident surface, and the side surface is light of the solid state light emitting device. A plurality of inclined surfaces that reduce the diameter at a predetermined rate as they move away from the incident surface along the axis, and the ratio at which the plurality of inclined surfaces reduce the diameter corresponds to the distance from the incident surface. is formed to be different from each other, said plurality of inclined surfaces, the more closer to the incident surface, are formed so that the ratio becomes smaller, characterized in Rukoto.

  In the light distribution lens for a luminaire, the plurality of inclined surfaces include a first inclined surface closer to the incident surface and a second inclined surface far from the incident surface, and the first inclined surface; It is preferable that the boundary with the second inclined surface is formed so as to be closer to the incident surface than an intermediate position from the incident surface to the emission surface.

  A lighting fixture according to the present invention includes any one of the lighting fixture light distribution lenses, a light source including a solid light-emitting element, and a fixture main body that holds the lighting fixture light distribution lens and the light source. .

In this lighting fixture, it is preferable that a holding member that holds the light distribution lens for the lighting fixture at a boundary between the plurality of inclined surfaces is provided.
The lighting fixture of the present invention includes a lighting fixture light distribution lens, a light source composed of a solid-state light emitting element, the lighting fixture light distribution lens, and a fixture main body that holds the light source, and the lighting fixture light distribution lens includes: An incident surface on which light emitted from the solid-state light emitting element is incident, and a mortar-shaped exit surface having a smaller diameter than the incident surface and recessed toward the incident surface, and a peripheral edge of the incident surface. A side surface connecting the periphery of the emission surface is formed in a three-dimensional shape having a reflection surface that reflects light incident from the incident surface, and the side surface is separated from the incident surface along the optical axis of the solid state light emitting device. A plurality of inclined surfaces that reduce the diameter at a predetermined rate as the time elapses, and the ratios at which the plurality of inclined surfaces reduce the diameter are different from each other according to the distance from the incident surface, Light distribution for the luminaire at the boundary of the inclined surface Characterized in that it comprises a holding member for holding the lens.

  The light distribution lens for a lighting fixture and the lighting fixture of the present invention distribute the light emitted from the solid state light emitting element in a wide angle because the light incident on the incident surface is reflected directly or from the side surface and is emitted from the emission surface. be able to. Moreover, since the curved surface forming the exit surface is recessed toward the entrance surface, it does not protrude downward from the ceiling material even when used in an embedded lighting fixture. Further, the light distribution of the light reflected by the inclined surface closer to the incident surface is made at a narrower angle than the light distribution of the light reflected by the inclined surface far from the incident surface, so that the diameter of the side surface is reduced. Compared with the case where the ratio is constant, it is possible to reduce unevenness in light intensity due to light distribution while suppressing a decrease in illuminance on the irradiated surface. As a result, the light distribution lens for a lighting fixture and the lighting fixture of the present invention have an effect that it is possible to distribute light emitted from the solid state light emitting element in a wide angle while suppressing deterioration in appearance.

It is sectional drawing which shows embodiment of the light distribution lens for lighting fixtures which concerns on this invention. It is explanatory drawing explaining the light distribution characteristic same as the above. It is sectional drawing which shows the comparative example same as the above. It is explanatory drawing explaining the light distribution characteristic of a comparative example same as the above. It is a disassembled perspective view which shows embodiment of the lighting fixture which concerns on this invention. It is a perspective view which shows the installation state same as the above. It is sectional drawing which shows other embodiment of the light distribution lens for lighting fixtures which concerns on this invention. It is sectional drawing which shows other embodiment of the light distribution lens for lighting fixtures which concerns on this invention. It is sectional drawing which shows another embodiment of the light distribution lens for lighting fixtures which concerns on this invention.

  Hereinafter, embodiments of a light distribution lens for a lighting fixture and a lighting fixture according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 5 and 6, the lighting fixture 1 of the present embodiment is embedded in an embedded hole 100 </ b> A provided in the ceiling material 100 and is emergency when power supply from the power system stops (power failure). It is an emergency lighting fixture that supplies power from the power source 4 and lights the light source. However, the lighting fixture to which the technical idea of the present invention is applicable is not limited to the emergency lighting fixture of the present embodiment, and can be applied to an embedded lighting fixture other than the emergency lighting fixture. Further, in the following description, the respective directions of up, down, left, and right in FIG. 5 are defined.

  The luminaire 1 includes a case 10, a base 2, a cover 3, an emergency power supply 4, a light source unit 5, a power supply device 6, a pair of mounting springs 7, a terminal block 8, and the like.

  The case 10 is formed in a bottomed cylindrical shape whose lower surface is opened by aluminum die casting. On the side wall on the open end (hereinafter referred to as opening 11) side of the case 10, rectangular holes 12 in which the hooking claws 231 of the hooking portions 23 of the base 2 are hooked are in positions corresponding to the hooking claws 231. (Only one hole 12 is shown in FIG. 6).

  In the base 2, a flat cylindrical main body portion 21 and a disk-shaped flange portion 22 projecting outward from the lower end of the main body portion 21 are integrally formed by aluminum die casting.

  A recess 211 for housing the light source unit 5 is provided on the bottom surface of the main body 21, and a connector (not shown) electrically connected to the LED module 52 of the light source unit 5 is further provided on the bottom surface of the recess 211. A hole (not shown) is provided for passing through. Furthermore, a hole 212 that penetrates in the thickness direction (vertical direction) is provided on the bottom surface of the main body 21.

  In addition, spring holding portions 213 that open in a T-shape when viewed from above are provided on the side surfaces of the main body portion 21 at point-symmetric positions with the central axis of the main body portion 21 as the center of symmetry. Furthermore, a hooking portion 23 having a hooking claw 231 at the tip is provided on the upper surface of the main body 21 at a point-symmetrical position with the central axis of the main body 21 as the center of symmetry.

  The main body 21 is inserted into the opening 11 of the case 10 and the pair of hooking claws 231 are respectively hooked in the holes 12 of the case 10, whereby the base 2 is attached to the case 10. In the present embodiment, the instrument body 9 is configured by the case 10 and the base 2.

  The cover 3 is made of a synthetic resin molded body having a disk-shaped main body portion 31 and a pair of hook portions 32 protruding upward (from the base 2 side) from the upper surface of the main body portion 31.

  On the bottom surface of the main body 31, circular holes 311 are provided at portions corresponding to the concave portions 211 of the base 2, and long holes 312 are provided on both sides of the holes 311. In addition, rectangular hooking grooves 313 are provided on the side surfaces of the main body 31 at point-symmetric positions with the central axis of the main body 31 as the center of symmetry.

  Further, a hooking claw (not shown) extending in a direction away from each other (outward) is provided at the tip of each hooking portion 32.

  As shown in FIG. 5, the emergency power source 4 has a main body 41 formed in a cylindrical shape that is long in the vertical direction, and a plurality of storage batteries (not shown) are arranged in the vertical direction inside the main body 41. It is stored. In addition, a connection portion 42 for electrically connecting the power supply device 6 is provided at the upper end of the main body portion 41, and a connection portion is connected to a connected portion (not shown) attached to the bottom surface of the case 10. By connecting 42, the emergency power supply 4 and the power supply device 6 are electrically connected.

  The emergency power source 4 is configured such that the storage battery is charged by the power supply device 6 while the power is normally supplied from the power system, and when the power system fails, the charge charged in the storage battery is discharged to supply power to the light source unit 5. Configured.

  As shown in FIG. 5, the light source unit 5 includes a light distribution lens 51, an LED module 52, a heat radiating member 53, and a holding member 54. The LED module 52 is configured by mounting a solid light emitting element (light emitting diode 521) on the lower surface of a rectangular mounting substrate, and is disposed above the light distribution lens 51. The heat dissipating member 53 is for dissipating heat generated by the light emitting diode 521, and is attached in close contact with the upper surface of the LED module 52. The light distribution lens 51, the LED module 52, and the heat dissipation member 53 are integrally assembled by the holding member 54.

  The integrally assembled light source unit 5 is housed in the recess 211 of the base 2 so that the light emitting diode 521 side is the opening side. That is, light from the light emitting diode 521 is irradiated to the outside through the recess 211. At this time, the connector electrically connected to the LED module 52 is exposed upward through a hole (not shown) formed in the bottom surface of the recess 211.

  The light source unit 5 is lit by DC power supplied from the emergency power supply 4 at the time of a power failure of the power system, and is not lit in a state where power is normally supplied from the power system. That is, the light source unit 5 is an emergency light source that is turned on only when a power failure occurs in the power system.

  As shown in FIG. 5, the power supply device 6 includes a substrate 61 formed in a rectangular plate shape that is long in the vertical direction, and a plurality of electronic components 62 are mounted on one surface (right surface) of the substrate 61. These electronic components 62 are discharged from the storage battery of the emergency power supply 4 and the charging circuit that converts the AC power supplied from the power system into the DC power of a predetermined voltage value and charges the storage battery of the emergency power supply 4. A power supply circuit that supplies DC power to the light source unit 5 to light the light source unit 5 is configured.

  The power supply device 6 is provided with a connector (not shown) to which the connector electrically connected to the light source unit 5 is connected. When the lighting fixture 1 is assembled, the light source is connected via the connector. The unit 5 and the power supply device 6 are electrically connected.

  The attachment spring 7 is formed into a long and rectangular plate shape by bending a sheet metal, for example, and is attached to the spring holding portion 213 of the base 2. And the lighting fixture 1 is attached to a ceiling by pinching | interposing the ceiling material 100 between the attachment spring 7 and the collar part 22 of the base 2 (refer FIG. 6).

  The terminal block 8 has a conventionally known quick-connection terminal structure, and is connected to a power line (not shown) previously wired on the back of the ceiling and is electrically connected to the power supply device 6 (not shown). ) Is connected. Then, by connecting the power line and the electric wire to the terminal block 8, AC power is supplied from the power system to the power supply device 6.

  By the way, when the base 2 of the lighting fixture 1 attached to the ceiling material 100 is exposed, the emergency power source 4 housed in the case 10 can be seen from the bottom through the hole 212 of the base 2, which is not desirable in design. . Therefore, in this embodiment, the cover 3 is attached to the base 2 so as to cover the lower surface of the base 2 in order to improve the design. The cover 3 is attached to the base 2 by inserting a pair of hooking portions 32 into the holes 212 of the base 2 and hooking the hooking portions 32 to hooked portions (not shown) provided in the back of the holes 212. .

  Next, the light distribution lens 51 which is the gist of the present invention will be described in more detail.

  As shown in FIG. 1, the light distribution lens 51 of the present embodiment includes an incident surface 510 on which light emitted from the light emitting diode 521 of the LED module 52 is incident, an output surface 511 from which the light is emitted, and an incident surface 510. It is formed in a three-dimensional shape having a side surface 512 that connects the periphery and the periphery of the emission surface 511. The light distribution lens 51 is made of a light-transmitting material such as quartz glass or acrylic resin or polycarbonate resin.

  The incident surface 510 is a circular flat surface. On the other hand, the emission surface 511 has a circular flat surface 5110 disposed in the center portion, and a mortar-shaped curved surface 5111 disposed outside the flat surface 5110 and recessed toward the incident surface 510. This curved surface 5111 has a contour of a rotating body in which a parabola whose origin is the periphery connected to the side surface 512 is rotated around the optical axis L passing through the light emission center of the light emitting diode 521. This parabola is expressed by the following formula.

y = ax ²
y: coordinates in the direction parallel to the optical axis L x: coordinates in the direction perpendicular to the optical axis L a: coefficient The coefficient a in the above formula is preferably in the range of 0 <a <0.1, and in particular, a = More preferably, it is in the vicinity of 0.02. If set in this way, the exit surface 511 (curved surface 5111) effectively refracts both the light directly incident from the incident surface 510 and the light totally reflected by the side surface 512, Light can be distributed over a wide angle. If the coefficient a is too small, the exit surface 511 (curved surface 5111) becomes nearly flat, and a wide-angle light distribution cannot be obtained. On the other hand, if the coefficient a is too large, the incident angle of each incident light becomes large, and the light is totally reflected into the light distribution lens 51 without being refracted and transmitted through the exit surface 511, resulting in a large amount of lost light flux.

  In this light distribution lens 51, in order to increase the illuminance immediately below the light emitting diode 521 while distributing the light emitted from the light emitting diode 521 at a wide angle, the diameter φ1 of the flat surface 5110 of the emission surface 511 and the emission surface 511 Is preferably in the range of 0 <φ1 / φ2 ≦ 0.33. In particular, it is more preferable that φ1 / φ2 = 0.15. It should be noted that the ratio with the outer diameter φ2 of the emission surface 511 is set with reference to the light emission property (particularly, the output and light distribution curve) of the light emitting diode 521 itself mounted on the LED module 51.

  The ratio between the height H1 of the light distribution lens 51 (the distance between the incident surface 510 and the surface including the outer edge of the exit surface 511) and the diameter φ3 of the incident surface 510 is 0.5 ≦ H1 / φ3 <1. .5 is preferred <, and more preferably around H1 / φ3 = 1. With this setting, the balance between the light emitted from the light emitting diode 521 that goes directly to the emission surface 511 and the light that is totally reflected by the side surface 512 and collected on the emission surface 511 is balanced. Can be optimized. Further, if the diameter φ2 of the incident surface 510 is too large (H1 / φ3 is too small) with respect to the height H1 of the light distribution lens 51, the light incident from the incident surface 510 does not go to the side surface 512. On the other hand, if the diameter φ3 of the incident surface 510 is too small (H1 / φ3 is too large) with respect to the height H1 of the light distribution lens 51, the light directed directly from the incident surface 510 toward the emission surface 511 is reduced. The ratio between the height H1 of the light distribution lens 51 and the diameter φ3 of the incident surface 510 also refers to the light emission characteristics (particularly, the output and light distribution curve) of the light emitting diode 521 mounted on the LED module 51. Is set.

  As shown in FIG. 1, according to the light distribution lens 51 of the present embodiment, of the light incident from the incident surface 510, the light totally reflected by the side surface 512 (total reflected light group XA: thin solid line in FIG. 1) (See arrow) is refracted and transmitted through the exit surface 511 and is distributed at a wide angle with respect to the optical axis L. The light radiated from the incident surface 510 at a relatively wide angle is totally reflected by the region of the side surface 512 near the incident surface 510 and is condensed near the optical axis L. This light has a large incident angle with respect to a plane parallel to the incident surface 510 and is easily totally reflected. However, in the exit surface 511 (curved surface 5111) of the light distribution lens 51, the region close to the optical axis L has a large inclination with respect to the plane parallel to the incident surface 510, so the incident angle of this light is small. As a result, this light is efficiently refracted and transmitted without being totally reflected by the exit surface 511 and is distributed at a wide angle with respect to the optical axis L.

  On the other hand, the light totally reflected in the region near the exit surface 511 on the side surface 512 has a small incident angle with respect to a plane parallel to the incident surface 510. The vicinity of the periphery of the exit surface 511 has a small inclination angle with respect to a plane parallel to the entrance surface 510, so that this light is also efficiently refracted and transmitted by the exit surface 511. As shown in FIG. 1, in the cross-sectional view showing the optical path, hatching showing the cross-section is omitted. The same applies to some cross-sectional views described later.

  Further, the light (direct ray group XB: see the broken line arrow in FIG. 1) that goes directly from the incident surface 510 to the output surface 511 is refracted and transmitted through the flat surface 5110 of the output surface 511 and directly below the light emitting diode 521. Contributes to improving illuminance.

  The light distribution lens 51 configured in this manner has a so-called bad wing light distribution characteristic. In particular, the total reflected light group XA is distributed at a wide angle, and the direct light group XB is distributed at a relatively narrow angle.

  By the way, the side surface 512 has a plurality of (two in this embodiment) inclined surfaces 5110 and 5111 that are reduced in diameter at a predetermined rate as they move away from the incident surface 510 along the optical axis L of the light emitting diode 521. In the following description, the inclined surface 5110 closer to the incident surface 510 is called a first inclined surface, and the inclined surface 5111 farther from the incident surface 510 is called a second inclined surface. Further, the ratio of the diameter reduction is expressed by an angle (hereinafter referred to as an inclination angle) θ formed by the perpendicular and the side surface 511 in a plane including a normal line of the incident surface 510 (for example, a normal line of the incident surface 510). To.

  In the light distribution lens 51 of the present embodiment, the ratio of the first inclined surface 5121 to reduce the diameter (first inclination angle θ1) is larger than the ratio of the second inclined surface 5122 to reduce the diameter (second inclination angle θ2) ( (Θ1 <θ2). For example, the first inclination angle θ1 is preferably set to 6 ° or less, and the second inclination angle θ2 is preferably set to 12 ° or less. In particular, it is preferable that the first inclination angle θ1 is set in the vicinity of 2 ° and the second inclination angle θ2 is set in the vicinity of 4 °. With this setting, light incident from the incident surface 510 is efficiently totally reflected by the side surface 512, so that the light emitted from the output surface 511 is distributed at a wide angle.

  Here, as shown in FIG. 3, the ratio of the diameter reduction is constant from the entrance surface 510 ′ to the exit surface 511 ′, that is, the light distribution lens 51 ′ (hereinafter referred to as the inclination angle θ of the side surface 512 ′ is constant). The light distribution characteristic of the light distribution lens 51 of this embodiment is compared with the light distribution characteristic of the comparative example. The inclination angle θ3 of the side surface 512 ′ of the comparative example (light distribution lens 51 ′) is set to an intermediate value (θ1 <θ3 <θ2) between the first inclination angle θ1 and the second inclination angle θ2. To do.

  The curve in FIG. 4 shows the light distribution characteristic of the comparative example. In FIG. 4, the horizontal axis indicates the angle formed by the optical axis L and the optical path, and the vertical axis indicates the luminous intensity (unit: candela: cd) of light emitted from the emission surface 511 ′. As is apparent from FIG. 4, there are approximately three peaks in the light distribution characteristics of the conventional example. The peak closest to 0 ° (the peak in the vicinity of 3 ° to 5 °) is a peak due to the direct ray group XC. The peak farthest from 0 ° (peak near 58 °) is a peak due to the total reflected light group XA. Furthermore, the intermediate peak (peak near 38 °) is a peak due to the direct light group XB.

  On the other hand, in the light distribution lens 51 of the present embodiment, the light totally reflected by the first inclined surface 5121 (first total reflected light group XD: see thick solid line arrow in FIG. 1) is totally reflected by the second inclined surface 5122. Light is distributed at a slightly narrower angle than the reflected light (second total reflected light group XA: see thin solid arrow in FIG. 1). Therefore, the light distribution characteristic of the light distribution lens 51 of the present embodiment is such that the peak farthest from 0 ° is compared with the light distribution characteristic of the comparative example (see the broken line in FIG. 2), as shown by the solid line in FIG. Thus, it moves in a direction approaching 0 °. That is, the light distribution characteristic of the light distribution lens 51 of the present embodiment is that of the valley portion (near 45 °) generated between the intermediate peak and the peak farthest from 0 °, compared to the light distribution property of the comparative example. The luminous intensity is relatively large. Therefore, according to the light distribution lens 51 of the present embodiment, it is possible to reduce unevenness in brightness (level difference) due to light distribution while suppressing a decrease in illuminance on the irradiated surface, as compared with the comparative example.

  As described above, the light distribution lens 51 of the present embodiment includes the entrance surface 510, the exit surface 511 from which light incident on the entrance surface 510 exits, and the side surface 512 that connects the periphery of the entrance surface 510 and the periphery of the exit surface 511. Are formed into a three-dimensional shape. Light incident from the solid state light emitting device (light emitting diode 521) is incident on the incident surface 510. The exit surface 511 is formed in a mortar shape having a smaller diameter (diameter φ2) than the entrance surface 510 and recessed toward the entrance surface 510. The side surface 512 is a reflecting surface that reflects light incident from the incident surface 510. Further, the side surface 512 has a plurality of inclined surfaces 5121 and 5122 that decrease in diameter at a predetermined rate as they move away from the incident surface 510 along the optical axis L of the solid state light emitting device (light emitting diode 521). Further, the side surface 512 is formed so that the ratio of diameter reduction of the plurality of inclined surfaces 5121 and 5122 is different from each other corresponding to the distance from the incident surface 510.

  With the above configuration, the light distribution lens 51 of the present embodiment distributes the light emitted from the light emitting diode 521 at a wide angle because light incident on the incident surface 510 is reflected directly or reflected by the side surface 512 and emitted from the output surface. Can be light. In addition, since the curved surface 5111 forming the exit surface 511 is recessed toward the entrance surface 510, the curved surface 5111 does not protrude downward from the ceiling material 100 even when used in the embedded lighting fixture 1. In addition, the light distribution lens 51 of the present embodiment has a light distribution reflected by the inclined surface 5121 closer to the incident surface 510 than a light distribution reflected by the inclined surface 5121 far from the incident surface 510. Use a relatively narrow angle. Therefore, the light distribution lens 51 of the present embodiment is less uneven in luminous intensity due to light distribution, while suppressing the decrease in illuminance on the irradiated surface, compared to the case where the ratio (tilt angle) for reducing the diameter of the side surface is constant (see the comparative example). Can be reduced. As a result, the light distribution lens 51 and the luminaire 1 of the present embodiment can distribute light emitted from the light source (the light emitting diode 521) at a wide angle while suppressing deterioration in appearance.

  Here, in the light distribution lens 51, it is preferable that the side surface 512 is formed by two inclined surfaces of the first inclined surface 5121 and the second inclined surface 5122. That is, there is an advantage that the smaller the number of inclined surfaces constituting the side surface 512, the easier it is to mold the light distribution lens 51. Further, the smaller the number of inclined surfaces constituting the side surface 512, the smaller the number of boundaries of the inclined surfaces. Therefore, the trouble of managing the angle R of the boundary 5123 during manufacturing is reduced, and the quality is easily maintained. There is also an advantage.

  Further, in the light distribution lens 51, the boundary 5123 between the first inclined surface 5121 and the second inclined surface 5122 on the side surface 512 is positioned closer to the incident surface 510 than the intermediate position from the incident surface 510 to the output surface 511. It is preferable to be formed. That is, as shown in FIG. 1, it is preferable that the height H3 from the exit surface 511 to the boundary 5123 is higher than the height H2 from the entrance surface 510 to the boundary 5123 (H2 <H3).

  As described above, the first inclined surface 5121 contributes to increasing the luminous intensity of the valleys of the light distribution characteristics. On the other hand, as the ratio of the first inclined surface 5121 to the side surface 512 increases, the luminous intensity of the second total reflected light beam group XA decreases. Therefore, in order to suppress a decrease in illuminance on the irradiation surface, the height H3 from the exit surface 511 to the boundary 5123 is higher than the height H2 from the entrance surface 510 to the boundary 5123 as described above. It is preferable to do.

  Incidentally, as shown in FIG. 7, the light distribution lens 51 is preferably provided with an outer casing 513 that protrudes outward over the entire circumference at the upper end portion of the side surface 512 including the boundary with the incident surface 510. That is, the holding member 54 can hold the light distribution lens 51 by hooking the pair of claws 540 to the outer casing 513. Here, if the outer casing 513 is provided near the exit surface 511 on the side surface 512, there is a possibility that the light distribution control of the light distribution lens 51 may be hindered. Therefore, the outer casing 513 is incident on the side surface 512 as described above. It is preferable to be provided at a portion close to the surface 510. However, the outer casing 513 is not necessarily provided on the entire circumference of the side surface 512, and may be provided on a part of the side surface 512.

  Alternatively, the holding member 54 may be configured to hold the light distribution lens 51 at a boundary 5123 between the plurality of inclined surfaces 5121 and 5122. For example, a pair of holding pieces 541 are provided on the holding member 54, and each holding piece 541 contacts the first inclined surface 5121 and the second inclined surface 5122 and holds the light distribution lens 51 at the boundary 5123 as shown in FIG. If the holding member 54 is configured in this way, it is not necessary to provide projections such as the outer casing 513, so that the manufacturing cost of the light distribution lens 51 can be reduced. However, as shown in FIG. 9, a stopper 5410 may be provided at the upper end of the holding piece 541 to come into contact with the incident surface 510.

51 Light distribution lens for lighting equipment
52 LED module
510 Incident surface
511 Output surface
512 sides
521 Light-emitting diode (solid-state light-emitting device)
5121 1st inclined surface
5122 Second inclined surface
5123 boundary

Claims (5)

A light incident surface on which light emitted from a solid state light emitting element is incident and a mortar-shaped light emitting surface having a smaller diameter than the light incident surface and recessed toward the light incident surface are used as a bottom surface, and a peripheral edge of the light incident surface and the light emitting surface. A side surface connecting the peripheral edge of the surface is formed into a three-dimensional shape having a reflective surface that reflects light incident from the incident surface, and the side surface is separated from the incident surface along the optical axis of the solid state light emitting device. And having a plurality of inclined surfaces that reduce the diameter at a predetermined ratio, and the ratio that the plurality of inclined surfaces reduce the diameter is different from each other corresponding to the distance from the incident surface ,
Wherein the plurality of inclined surfaces, the nearer to the incident surface, the light distributing lens for lighting equipment according to claim Rukoto formed such that the ratio becomes smaller.   The plurality of inclined surfaces include a first inclined surface closer to the incident surface and a second inclined surface far from the incident surface, and a boundary between the first inclined surface and the second inclined surface is The light distribution lens for a lighting fixture according to claim 1, wherein the light distribution lens is formed so as to be closer to the entrance surface than an intermediate position from the entrance surface to the exit surface. A light fixture comprising: the light distribution lens for a lighting fixture according to claim 1 or 2; a light source comprising a solid light-emitting element; and a fixture main body for holding the light distribution lens for the lighting fixture and the light source. The lighting fixture according to claim 3 , further comprising a holding member that holds the light distribution lens for the lighting fixture at a boundary between the plurality of inclined surfaces . A lighting device light distribution lens, a light source comprising a solid light-emitting element, and the lighting device light distribution lens and a device body holding the light source,
The light distribution lens for a luminaire has a bottom surface including an incident surface on which light emitted from the solid light emitting element is incident and a mortar-shaped exit surface having a smaller diameter than the incident surface and recessed toward the incident surface. And the side surface connecting the periphery of the incident surface and the periphery of the exit surface is formed into a three-dimensional shape that is a reflective surface that reflects light incident from the incident surface, and the side surface is an optical axis of the solid state light emitting device. And a plurality of inclined surfaces that decrease in diameter at a predetermined rate as they move away from the incident surface, and the ratios that the plurality of inclined surfaces decrease in diameter correspond to each other from the incident surface. Formed differently,
Wherein the plurality of luminaire you further comprising a holding member in the boundary of the inclined surface to hold the light distributing lens for the luminaire.

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