JP7016016B2 - Lighting equipment - Google Patents

Description

The present disclosure relates to lighting equipment.

Conventionally, as a lighting device, there is one described in Patent Document 1. The illuminator comprises a housing, a light source, and a lens. The light source is arranged in the housing, and the lens is arranged on the light projecting side with respect to the light source in the housing. The lens receives the light from the light source, executes the light distribution of the incident light, and projects the light for which the light distribution is performed from the light projecting unit to the light projecting region.

Japanese Unexamined Patent Publication No. 2017-67831

A part of the light entering from the light entering portion of the lens travels in the lens, reaches the outer peripheral surface portion provided on the light emitting side and the outer peripheral side of the lens, and is emitted from the outer peripheral surface portion thereof. Here, the light emitted from the outer peripheral surface portion tends to be stray light that does not go out of the lighting device and remains in the lighting device, is easily attenuated in the lighting device, and reduces the light extraction efficiency of the lighting device. .. Further, the light emitted from the outer peripheral surface portion tends to cause color unevenness in the peripheral portion of the irradiation region.

Therefore, an object of the present disclosure is to provide a lighting device that can easily increase the light extraction efficiency and suppress the color unevenness of the irradiation light.

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 substrate arranged in the housing, and a light source having a light emitting element mounted on the substrate. An optical member having a light input section through which light from a light source enters and a light projecting section for projecting light is provided, and the optical member projects outward in the radial direction and is locked to a locking portion. The annular support portion is provided on the light source side in the thickness direction of the substrate, and the outer surface of the annular support portion is provided with irregularities.

According to the lighting device according to the present disclosure, it is easy to increase the light extraction efficiency and to suppress the color unevenness of the irradiation light.

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 including the main central axis of the said lighting apparatus. 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 is seen from the upper side. It is a perspective view when the holder which held the 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 perspective view when the lens is seen from the upper side. It is a top view when the lens is seen from the lower side. It is a partial schematic cross-sectional view for demonstrating the dimensional comparison relationship between the outer diameter φa of an annular support portion and the inner diameter φd of an annular groove in a lens in a single state. (A) is a schematic view when a part of the outer peripheral surface of the annular support portion is viewed from the outside in the radial direction, and (b) is a schematic diagram corresponding to (a) in the lens of the modified example. (C) is a schematic diagram corresponding to (a) in the lens of another modified example. It is a top view corresponding to FIG. 10 in the lens of another modification. It is a top view corresponding to FIG. 10 in the lens of the further modified example. (A) is a schematic cross-sectional view of a part of the annular support portion in another example lens, and (b) is a schematic cross-sectional view corresponding to (a) in another example lens.

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, in the drawings, the same components are designated by the same reference numerals, and duplicate description will be omitted. 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, and the θ direction indicates the circumferential direction of the annular support portion 52. Further, the Z direction indicates the height direction of the lighting device 1, and coincides with the thickness direction of the substrate 21 described 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 50 (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 the optical axis of the emitted light is aligned in the vertical direction after being irradiated. 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 composition includes a material in which all the components are silicone resin, and also a composition in which the main component having the largest weight% is silicone resin and contains a material other than silicone resin. 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 as a housing and a frame body (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 protruding portion provided in the bottomed cylindrical portion into the hole provided in the fin and then plastically deforming the protruding portion. Further, 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 (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 the lower side (projection side) of the outer peripheral surface portion 51 in the Z direction. ). 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.

The lens fall prevention member 40 is attached to the lower side of the lens 50. The lens fall prevention member 40 is a cylindrical 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 64 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. In the state where the assembly of the lighting device 1 is completed, the substantially circular edge 64 of the lens 50 comes into contact with the substrate 21, the light emitting portion 22 is housed in the cylindrical hole 53, and the opening 55 is the substrate 21 of the light source 20. It is blocked by the bottom surface. As a result, the cylindrical hole 53 is arranged so as to surround the light source 20, and the light emitted from the light emitting unit 22 is incident on the lens 50 without leaking. With this configuration, the light extraction efficiency is increased.

FIG. 9 is a perspective view of the lens 50 when viewed from above, and FIG. 10 is a plan view of the lens 50 when viewed from below. As shown in FIG. 9, the cylindrical hole 53 includes a cylindrical inner peripheral surface 54 and a bottom surface 56 extending substantially parallel to the Rθ plane (horizontal plane). With reference to FIG. 9, the inner peripheral surface 54 of the cylinder and the bottom surface 56 constitute the light entering portion 71 of the lens 50, and with reference to FIG. 10, the lens 50 is on the side opposite to the substrate 21 side in the Z direction. It has a light projecting unit 57.

The lens 50 is made of a transparent silicone resin (silicone rubber) having translucency. 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 composed. 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, since the lens 50 is made of a silicone resin, the heat resistant temperature is, for example, a high temperature of about 200 ° C. Therefore, even if a high-output LED such that the temperature of the light emitting unit 22 is about 140 ° C. to 160 ° C. is adopted, even if the lens 50 is arranged close to the light emitting unit 22, the lens 50 is from the light emitting unit 22. It is unlikely to cause thermal deterioration due to heat, or it does not cause thermal deterioration. Therefore, as described above, the lens 50 can be arranged close to the light emitting unit 22, and the light extraction efficiency can be increased. Further, the lens 50 is made of a silicone resin (silicone rubber) and has elasticity. Therefore, even if the edge 64 (see FIG. 9) of the opening 55 in the lens 50 is pushed into the surface on the lens 50 side of the substrate 21 and brought into contact with the surface on the lens 50 side in the substrate 21, the lens 50 and the substrate 21 are damaged. Can be suppressed.

As shown in FIG. 9, a plurality of ridge-shaped (kamaboko-shaped) protruding portions 59 are provided on the inner peripheral surface 54 of the cylinder. The plurality of protrusions 59 are arranged so as to be adjacent to each other in the θ direction, and each protrusion 59 extends from one end to the other end in the Z direction. An LED has a property that light having a short wavelength is easily emitted in a direction along the optical axis, whereas light having a long wavelength is easily emitted in a direction away from the optical axis. Color unevenness may occur. In this embodiment, the light emitted from the LED can be mixed and diffused by a plurality of ridge-shaped (kamaboko-shaped) protruding portions 59, and color unevenness can be suppressed. The side surface of the concave portion on the incident side of the lens may have a diffused portion other than the ridge-shaped protruding portion extending in the Z direction. For example, the side surface of the concave portion on the incident side of the lens may have a plurality of dimples (holes) formed at substantially uniform densities as diffusers, and may be formed at substantially equal densities as diffusers. It may have a plurality of protrusions composed of a part of a substantially sphere. Alternatively, the side surface of the concave portion on the incident side of the lens may not have any diffuser portion.

As shown in FIGS. 3 and 10, 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 light projecting portion 57 including the lower side surface of the lens 50 has a stepped exit surface 58. By providing the light emitting surface 58 in a stepped shape, the thickness can be made thinner than that of a normal lens. Therefore, the weight of the lighting device 1 can be reduced and the manufacturing cost of the lens 50 can be reduced. The light projecting portion may have an emission surface other than the stepped emission surface that can be thinned. For example, the light emitting surface has a tapered surface shape that expands toward the light emitting side in the Z direction. In particular, it may have an exit surface such as an inner peripheral surface of a cone. Alternatively, the emission surface of the light projecting portion may be formed in a disk shape or the like, and the lens may have a thick wall structure.

As shown in FIGS. 2 and 10, the lens 50 has a plurality of filter locking portions 62 projecting from the light projection side surface 83 to the light projection side in the Z direction. The filter locking portion 62 is used when a disk-shaped filter (not shown) is attached to the light emitting side of the lens 50. As shown in FIG. 10, a plurality of filter locking portions 62 are provided at substantially equal intervals in the θ direction, and each filter locking portion 62 has a substantially L-shaped cross section (see FIG. 2). It has a height extension and a radial extension. The height extension portion extends in the Z direction, and the radial extension portion extends inward in the R direction from the lower end portion of the thickness direction extension portion. The projection side surface 83, the inner portion in the R direction of the extending portion in the height direction, and the upper portion in the Z direction of the extending portion in the radial direction define a concave portion. The filter is mounted on the lower side of the lens 50 by accommodating a part of the edge portion of the disk-shaped filter in each recess included in the plurality of filter locking portions 62. The lighting device 1 does not have to have a filter attached to the lens 50, and may be used without using a filter. The filter may be attached to the lens 50 when needed. Alternatively, the lens may not have a filter locking portion and may have a structure to which a filter cannot be attached.

The annular edge portion located on the outer peripheral side of the lens 50 on the Z-direction floodlight side constitutes the annular support portion 52. Again, referring to FIG. 3, the lens 50 is locked and fixed to the base 10. Next, the mounting structure of the lens 50 with respect to the base 10 will be described. 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 in the R direction inward in the R direction.

FIG. 11 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. 11, when the lens 50 exists in a single state, 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.

As described above, since the lens 50 is made of a silicone rubber elastic body having a shore (A) hardness of 50 to 90 and has elasticity, it is different from a hard lens made of acrylic or a hard lens made of polycarbonate. It can be compressed and distorted. 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 all or a part of the annular support portion 52 on the outer peripheral side 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 smaller than the outer diameter of the annular support portion 52 in the single lens 50. With this configuration, with the entire or part of the outer peripheral side of the annular support portion 52 being fitted into the annular groove 7, the tip portion of the annular support portion 52 on the outer side in the R direction is inside the bottom portion 9 of the annular groove 7 in the R direction. Is pressed against 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. Therefore, it is possible to prevent dust and insects from invading the inside of the lighting device 1, and it is difficult for shadows due to dust and insects to be generated on the irradiation surface when the lighting device 1 is lit. As a result, it is possible to suppress the deterioration of the lighting performance due to the shadow, and the cleanliness can be improved. The annular support portion does not have to be press-fitted into the annular groove, and may be arranged at a distance from the bottom of the annular groove. Further, the mounting portion of the annular support portion may not be an annular groove, but may be a plurality of non-annular grooves located on the same plane and arranged at intervals in the circumferential direction. In short, the mounting portion may have any structure as long as the annular support portion can be locked and fixed.

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 (see FIG. 3) 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.

Since the outer diameter φa of the annular support portion 52 of the lens 50 in the single state is larger than the inner diameter φb of the inner peripheral surface of the base 10, the lens 50 can be reliably fixed to the inner peripheral side of the base 10 by itself. .. Therefore, a lens fixing member for fixing the lens 50 to the base 10 is not required. Further, the lens fall prevention member 40 that prevents the lens 50 from falling can be omitted. Therefore, 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.

Again, referring to FIGS. 9 and 10, the outer peripheral surface 80 of the annular support portion 52 is provided with irregularities. More specifically, the outer peripheral surface 80 is provided with a plurality of ridge-shaped protrusions 81, and each ridge-shaped protrusion 81 extends in the Z direction from the upper end to the lower end in the Z direction of the outer peripheral surface 80. Further, the plurality of ridge-shaped protrusions 81 are provided so as to be adjacent to the entire area of the outer peripheral surface 80 where the outer diameter is the largest in the θ direction. By providing a plurality of ridge-shaped protrusions 81 on the outer peripheral surface 80, unevenness is generated on the outer peripheral surface 80 as a result.

Further, as shown in FIG. 10, unevenness is also provided on the light projecting side surface 83 in the Z direction of the annular support portion 52. More specifically, a plurality of dimples (holes in the shape of a golf ball having a shape of a part of a substantially sphere) 84 are provided on the projection side surface 83 in the Z direction of the annular support portion 52 at substantially equal densities. .. The dimple 84 is provided on the light projecting side surface 83 in a region outside the R direction with respect to the filter locking portion 62. By providing a plurality of dimples 84 on the light projecting side surface 83 of the annular support portion 52, unevenness is generated on the light projecting side surface 83 as a result. As shown in FIG. 11, the dimple 84 is located in the annular groove 7 in a state where all or a part of the annular support portion 52 on the outer peripheral side is housed in the annular groove 7. Further, in a state where all or a part of the annular support portion 52 on the outer peripheral side is housed in the annular groove 7, each ridge-shaped protruding portion 81 comes into contact with the bottom portion 9 of the annular groove 7.

As described above, the lighting device 1 is arranged in the base (housing) 10 including the inner peripheral surface 15 having the annular groove (locking portion) 7, and the base 10, and is mounted on the substrate 21 and the substrate 21. A light source 20 having an LED (light emitting element) is provided. Further, the lighting device 1 includes a lens (optical member) 50 having a light input unit 71 into which light from the light source 20 enters and a light projecting unit 57 in which light is projected. Further, the lens 50 has an annular support portion 52 that protrudes outward in the radial direction (R direction) and is locked to the annular groove 7 on the light emitting side in the thickness direction (Z direction) of the substrate 21. The outer surface of the annular support portion 52 is provided with irregularities.

Therefore, it travels in the lens 50, reaches the outer peripheral surface 80 provided on the light emitting side and the outer peripheral side of the lens 50, and reflects a part of the light emitted from the outer peripheral surface 80 toward the irradiation region side due to the unevenness. It can irradiate the outside of the lighting device 1. Therefore, the stray light that remains in the lighting device 1 can be suppressed, and the light extraction efficiency of the lighting device 1 can be improved. Further, the light emitted from the outer peripheral surface 80 can be mixed and diffused by the unevenness. Therefore, it is possible to suppress color unevenness in the peripheral region of the irradiation light and irradiate beautiful light.

Further, the outer peripheral surface 80 of the annular support portion 52 may be provided with irregularities.

According to the above configuration, the light emitted from the outer peripheral surface 80 of the annular support portion 52 and easily causing color unevenness can be mixed and diffused by the unevenness provided on the outer peripheral surface 80 which is the irradiation surface. Therefore, it is possible to effectively suppress color unevenness in the peripheral region of the irradiation light.

Further, a plurality of ridge-shaped protrusions 81 extending in the Z direction and adjacent to each other in the θ direction may be provided on the outer peripheral surface 80.

According to the above configuration, since the outer peripheral surface 80 is provided with a plurality of ridge-shaped protrusions 81 adjacent to each other in the θ direction, the light emitted from the outer peripheral surface 80 of the annular support portion 52 is directed in the θ direction. Can be mixed effectively. Therefore, it is possible to effectively suppress color unevenness in the peripheral region of the irradiation light. Further, since the ridge-shaped protrusion 81 extending in the Z direction is provided on the outer peripheral surface 80, it is easy to release the lens 50 from the mold used for its molding. Therefore, the lens 50 can be easily formed by molding such as injection molding. Then, the unevenness can be easily formed on the outer peripheral surface 80 only by providing the mold with a gutter-shaped groove corresponding to the ridge-shaped protrusion 81.

Further, a plurality of dimples 84 having a shape of a part of a substantially sphere may be provided on the projection side surface 83 in the Z direction of the annular support portion 52 at substantially equal densities.

According to the above configuration, a plurality of dimples 84 are provided on the projection side surface 83 in the Z direction of the annular support portion 52. Therefore, the stray light that has reached the projection side surface 83 can be reflected inward in the R direction by the dimple 84, and the stray light can be easily taken out to the outside of the lighting device 1. Therefore, the light extraction efficiency can be effectively increased. Further, since the dimple 84 having a shape of a part of a substantially spherical surface is provided on the light projecting side surface 83 in the Z direction of the annular support portion 52, it is easy to release the lens 50 from the mold used for its molding. Then, the unevenness can be easily formed on the light projecting side surface 83 only by providing the mold with a protruding portion formed of a part of a substantially spherical surface corresponding to the dimple 84.

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 has a large elasticity. Therefore, even if the outer surface of the annular support portion 52 is provided with irregularities, the lens 50 can be smoothly released from the mold without being damaged.

Further, the lens 50 may be made of a silicone resin composition.

According to the above configuration, it is easy to form a lens 50 which is a rubber elastic body having a shore (A) hardness of 50 to 90 and has high translucency. Further, the silicone resin composition tends to become a liquid having a low viscosity and a high fluidity when placed in a mold in molding. Therefore, it is easy to fill the mold with the material without gaps, and the transferability of the unevenness of the annular support portion 52 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 case where the outer peripheral surface 80 of the annular support portion 52 of the lens 50 and the light projecting side surface 83 are provided with irregularities has been described. However, the unevenness may be provided only on the outer peripheral surface of the annular support portion of the lens, or may be provided only on the light projection side surface of the annular support portion of the lens. Alternatively, the unevenness may be provided only on the upper side surface (the surface on the substrate side in the Z direction) of the annular support portion of the lens, and the upper side surface, the outer peripheral surface of the annular support portion, and the light projecting side surface of the annular support portion. It may be provided in at least one of them.

Further, as shown in FIG. 12A, that is, a schematic view of a part of the outer peripheral surface 80 of the annular support portion 52 when viewed from the outside in the R direction, a ridge-shaped shape extending in the Z direction on the outer peripheral surface 80. The case where the protruding portion (kamaboko-shaped protruding portion) 81 of the above is provided has been described. However, instead of the ridge-shaped protrusions (kamaboko-shaped protrusions), a plurality of gutter-shaped grooves adjacent to each other in the circumferential direction and extending in the Z direction are provided on the outer peripheral surface of the annular support portion to provide an annular shape. The outer peripheral surface of the support portion may be provided with irregularities. Alternatively, by alternately forming ridge-shaped protrusions extending in the Z direction and gutter-shaped grooves extending in the Z direction on the outer peripheral surface of the annular support portion in the θ direction, the annular support portion can be formed. The outer peripheral surface may be provided with irregularities.

Alternatively, as shown in FIG. 12 (b), that is, the schematic diagram corresponding to FIG. 12 (a) in the lens 150 of the modified example, a plurality of states in which they are in close contact with each other on the outer peripheral surface 180 of the annular support portion 152 of the lens 150. Dimples 184 may be provided. Then, by forming the plurality of dimples 184 in close contact with each other, unevenness may be formed on the outer peripheral surface 180 of the annular support portion 152. Alternatively, instead of providing a plurality of dimples in a state of being in close contact with each other on the outer peripheral surface of the annular support portion, a protruding portion consisting of a part of a plurality of spheres in a state of being in close contact with each other is provided on the outer peripheral surface of the annular support portion. Unevenness may be provided. Alternatively, the outer peripheral surface of the annular support portion may be provided with irregularities on the outer peripheral surface of the annular support portion by providing a plurality of dimples and a protruding portion composed of a part of a plurality of spheres in a state of being in close contact with each other. .. Alternatively, as shown in FIG. 12 (c), that is, the schematic diagram corresponding to FIG. 12 (a) in the lens 250 of another modification, the plurality of dimples 284 are discretely arranged on the outer peripheral surface 280 of the annular support portion 252. May be placed in. Alternatively, instead of the dimples, protrusions composed of a part of a plurality of spheres may be discretely arranged on the outer peripheral surface of the annular support portion. Alternatively, both the plurality of dimples and the protrusions formed by a part of the plurality of spheres may be discretely arranged on the outer peripheral surface of the annular support portion.

Further, as shown in FIG. 10, a case where a plurality of dimples 84 are closely arranged on the projection side surface 83 in the Z direction of the annular support portion 52 has been described. However, a plurality of protrusions composed of a part of a substantially sphere may be closely arranged on the Z-direction floodlight side surface of the annular support portion, and a plurality of dimples may be abbreviated on the Z-direction floodlight side surface of the annular support portion. A plurality of protrusions formed of a part of the sphere may be closely arranged.

Alternatively, as shown in FIG. 13, that is, the plan view corresponding to FIG. 10 in the lens 350 of another modification, a plurality of dimples 384 are arranged at substantially equal densities on the projection side surface 383 in the Z direction in the annular support portion 352. It may be formed discretely. Then, by the discrete formation of the plurality of dimples 384, unevenness may be formed on the projection side surface 383 in the Z direction in the annular support portion 352. Alternatively, unevenness may be formed on the light projecting side surface by discretely forming projecting portions composed of a part of a plurality of spheres on the light projecting side surface in the Z direction of the annular support portion at substantially equal densities. Alternatively, by forming a plurality of dimples and protrusions composed of a part of a plurality of spheres discretely on the light projecting side surface in the Z direction of the annular support portion at substantially equal densities, the light projecting side surface is uneven. It may be formed.

Alternatively, as shown in FIG. 14, that is, the plan view corresponding to FIG. 10 in the lens 450 of the further modified example, a plurality of ridge-shaped protrusions extending in the R direction on the projection side surface 483 in the Z direction of the annular support portion 452. By forming the portions 484 so as to be adjacent to each other in the θ direction, unevenness may be formed on the light projecting side surface 483. Alternatively, unevenness may be formed on the light projecting side surface by forming a plurality of gutter-shaped grooves extending in the R direction on the light projecting side surface in the Z direction of the annular support portion so as to be adjacent to each other in the θ direction. Alternatively, a plurality of ridge-shaped protrusions extending in the R direction and a plurality of gutter-shaped grooves extending in the R direction are alternately provided adjacent to each other in the θ direction on the projection side surface in the Z direction of the annular support portion. Therefore, unevenness may be formed on the side surface of the floodlight. Alternatively, a plurality of rectangular parallelepiped-shaped protrusions extending in the R direction may be provided adjacent to each other in the θ direction on the projection side surface in the Z direction of the annular support portion, and a plurality of rectangular parallelepiped shapes extending in the R direction may be provided on the projection side surface. Grooves may be provided so as to be adjacent to each other in the θ direction. Then, by forming these rectangular parallelepiped-shaped protrusions or rectangular parallelepiped-shaped grooves, unevenness may be formed on the projected side surface of the annular support portion. Alternatively, the protruding portion provided on the outer surface of the annular support portion may not be a protruding portion formed of a part of a sphere or a ridge-shaped protruding portion, and may be a protruding portion having any other shape. For example, the protrusion provided on the outer surface of the annular support portion may be a quadrangular pyramid-shaped protrusion, a truncated cone-shaped protrusion, a rectangular parallelepiped or cube-shaped protrusion, or the like. Alternatively, the recess provided on the outer surface of the annular support portion does not have to be a dimple, and may be a recess of any other shape. For example, the recess provided on the outer surface of the annular support portion may be a quadrangular pyramid-shaped recess, a truncated cone-shaped recess, a rectangular parallelepiped or cubic recess, or the like. Further, the outer surface of the annular support portion may be provided with both a protruding portion and a concave portion to provide unevenness on the outer surface, and the outer surface of the annular support portion may be provided with only one of the protruding portion and the concave portion. The outer surface may be provided with irregularities. In short, any structure may be used as long as at least one of the protrusion and the recess provided on the outer surface of the annular support portion has a structure capable of forming irregularities on the outer surface of the annular support portion.

Further, the size of the protrusion or the recess provided on the outer surface of the annular support portion of the lens is not particularly limited, and any size may be used as long as it is provided on the outer surface of the annular support portion. However, the size of the protrusions and recesses provided on the outer surface of the annular support portion is preferably the size described below. FIG. 15A is a schematic cross-sectional view of a part of the annular support portion 552 in another example lens 550. As shown in FIG. 15A, when the dimple 584 is formed on the light projecting side surface 583, if the diameter of the opening of the dimple 584 is 0.5 mm to 2.0 mm, light diffusion can be effectively performed. , Color unevenness of ambient light can be effectively suppressed, and light can be efficiently reflected to the irradiation region side. Alternatively, a disk-shaped recess may be used instead of the dimples. Even in this case, if the diameter of the circular opening is 0.5 mm to 2.0 mm, the color unevenness of the ambient light is effectively suppressed. It can also efficiently reflect light to the irradiation area side.

Further, FIG. 15B is a schematic cross-sectional view of a part of the annular support portion 652 in another example lens 650. As shown in FIG. 15B, when a disc-shaped protrusion 684 having a circular tip surface 690 is formed on the light projecting side surface 683, the diameter of the tip surface 690 is 0.5 mm to 2.0 mm. Therefore, it is possible to effectively diffuse the light and effectively suppress the color unevenness of the ambient light. Alternatively, even when a protrusion made of a part of a sphere (for example, a hemispherical protrusion) is adopted instead of the disk-shaped protrusion 684, the circle in the plan view when viewed from the lower side in the Z direction is used. When the diameter is 0.5 mm to 2.0 mm, it is preferable that the diffusion of light can be effectively performed and the color unevenness of the ambient light can be effectively suppressed.

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

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 illuminating device has a housing including an inner peripheral surface having a locking portion, a light source having a substrate and a light emitting element mounted on the substrate, and light from the light source. An optical member having a light entering portion and a light emitting portion that emits light is provided, and an annular support portion in which the optical member projects outward in the radial direction and is locked to the locking portion is provided in the thickness direction of the substrate. An optical device having any structure may be used as long as it is provided on the light source side of the light source and the outer surface of the annular support portion is provided with irregularities.

7 annular groove, 10 bases, inner peripheral surface of 15 bases, 20 light sources, 21 substrates, 50,150,250,350,450,550,650 lenses, 52,152,252,352,452,552,652 Ring support, 57 light source, 71 light input, 80,180,280 outer peripheral surface of ring support, 81 ridge-shaped protrusion, 83,383,483,583,683, light source side of ring support, 84,384,584 Dimples, R direction Radial direction of the annular support, θ direction Circumferential direction of the annular support, Z direction Height direction of the illuminator (thickness direction of the substrate).

Claims (4)

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 projection unit in which light is projected are provided.
The optical member has an annular support portion that protrudes outward in the radial direction and is locked to the locking portion on the light emitting side in the thickness direction of the substrate.
The outer surface of the annular support portion is provided with irregularities.
The outer peripheral surface of the annular support portion is provided with irregularities, and the outer peripheral surface is provided with irregularities.
A lighting device in which a plurality of ridge-shaped protrusions extending in the thickness direction and adjacent to each other in the circumferential direction are provided on the outer peripheral surface . A plurality of protrusions composed of a part of a substantially sphere, or a plurality of holes having a shape of a part of a substantially sphere are provided on the projected side surface in the thickness direction of the annular support portion at substantially equal densities. Item 1. The lighting device according to Item 1. The lighting device according to claim 1 or 2 , wherein the optical member is made of a rubber elastic body having a shore (A) hardness of 50 to 90. The lighting device according to any one of claims 1 to 3 , wherein the optical member is made of a silicone resin composition.

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