JP6675828B2 - Lighting lens, light emitting device and lighting equipment - Google Patents

Description

  The present invention relates to a lighting lens, a light emitting device, and a lighting fixture.

  Patent Literature 1 describes a lighting fixture. The lighting fixture described in Patent Literature 1 includes a moving cylinder that moves in the optical axis direction by rotating. A convex lens is provided on the moving cylinder. The beam angle can be changed by moving the movable cylinder in the optical axis direction.

JP 2007-299679 A

  In the lighting apparatus described in Patent Literature 1, when the movable cylinder is moved in the optical axis direction, the central luminous intensity changes greatly. Further, when the movable cylinder is moved in the optical axis direction, the beam angle changes greatly. In the lighting apparatus described in Patent Literature 1, the flare light cannot be changed without greatly changing the central luminous intensity or the beam angle. Note that flare light is light (diffused light) that spreads outside the set irradiation range.

  The present invention has been made to solve the above problems. An object of the present invention is to provide an illumination lens that can control the intensity of flare light without largely changing the center luminous intensity or the beam angle. Another object of the present invention is to provide a light-emitting device and a lighting fixture including such a lighting lens.

The illumination lens according to the present invention has an outer peripheral surface whose diameter increases as approaching the first surface, wherein a hollow portion is formed around the outer peripheral surface, and the hollow portion is opened on the first surface. The lens includes a lens and a second lens having a cylindrical adjustment portion that is not hollow, and the adjustment portion is movable in the hollow portion along the central axis of the outer peripheral surface.

  The light-emitting device according to the present invention includes the illumination lens, a light source unit that irradiates light to an inner peripheral surface of the first lens forming the second surface and the hollow portion of the adjustment unit facing the opposite side of the first surface, A holder for holding the illumination lens.

  A lighting device according to the present invention includes the above light emitting device, and a main body to which the light emitting device is attached and which has a heat radiating portion for radiating heat generated from the light emitting device.

  According to the present invention, the intensity of flare light can be controlled without greatly changing the center luminous intensity or the beam angle.

FIG. 1 is a perspective view showing a lighting fixture according to Embodiment 1 of the present invention. It is a side view which shows a lamp. It is a side view which shows a lamp. It is the figure which disassembled the holder part. FIG. 3 is a diagram illustrating a cross section of a light emitting device. FIG. 4 is a light distribution diagram of light emitted from a light emitting device. FIG. 7 is a diagram showing a cross section of a light emitting device according to Embodiment 2 of the present invention. FIG. 10 is a diagram illustrating a cross section of a light emitting device according to Embodiment 3 of the present invention. FIG. 13 is a cross-sectional view illustrating another example of the light emitting device according to Embodiment 3 of the present invention. FIG. 14 is a diagram showing a cross section of a light emitting device according to Embodiment 4 of the present invention. FIG. 14 is a cross-sectional view illustrating another example of the light emitting device according to Embodiment 4 of the present invention. FIG. 15 is a diagram showing a cross section of a light emitting device according to Embodiment 5 of the present invention. FIG. 4 is a light distribution diagram of light emitted from a light emitting device.

  The present invention will be described with reference to the accompanying drawings. Duplicate descriptions will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a lighting fixture according to Embodiment 1 of the present invention. FIG. 1 shows a lighting device 1 for a spotlight as an example. The use of the lighting fixture 1 is not limited to a spotlight. The lighting fixture 1 is installed on a ceiling, for example. The lighting fixture 1 may be installed in a place other than the ceiling. For example, the lighting fixture 1 may be installed on a floor or a wall.

  The lighting fixture 1 includes, for example, a lamp 2 and a power supply case 3. The lamp 2 includes a light source unit 4 (not shown in FIG. 1). A power supply device for lighting the light source unit 4 is housed in the power supply case 3. FIG. 1 shows an example in which the lamp 2 is supported by the power supply case 3 via a shaft extending downward from the power supply case 3.

  The lamp 2 includes, for example, a main body 5 and a light emitting device 6. The light emitting device 6 is attached to the main body 5. A mounting surface (not shown) for mounting the light emitting device 6 is formed on the main body 5. The main body 5 is formed of a material having high thermal conductivity such as aluminum die casting. The main body unit 5 includes a heat radiating unit that radiates heat generated from the light emitting device 6. For example, the main body 5 is provided with a plurality of fins as a heat radiator. The fin is provided on a surface formed on the opposite side of the mounting surface.

  The light emitting device 6 includes a lens 7 and a holder 8 in addition to the light source 4. FIG. 2 and FIG. 3 are side views showing the lamp 2. FIG. 4 is an exploded view of the holder unit 8. FIG. 5 is a diagram illustrating a cross section of the light emitting device 6.

  The light source unit 4 includes, for example, a substrate and a light emitting unit. The light emitting section is provided on one surface of the substrate. The light emitting unit includes, for example, a plurality of light emitting elements and a wavelength conversion member. The wavelength conversion member is a member that seals the light emitting element. The wavelength conversion member has a certain translucency. As the light emitting element, for example, an LED element that emits blue light is used. The light emitting element is mounted on a wiring pattern of a substrate by COB (Chip On Board) technology.

  In the light emitting device 6, light distribution control is performed by the lens 7. That is, the lens 7 is a member that controls light emitted from the light source unit 4 to a desired light distribution. The symbol L in FIG. 5 indicates the optical axis of the lens 7. The optical axis L coincides with a normal passing through the light emission center of the light source unit 4. The lens 7 includes, for example, a condenser lens 9 and an adjustment lens 10.

  The condensing lens 9 has a shape obtained when one plate disposed at a position away from the optical axis L is rotated about the optical axis L as a whole. The condenser lens 9 includes, for example, a disk-shaped flange 11 and a truncated cone-shaped condenser 12. The central axis of the flange 11 and the central axis of the light converging section 12 respectively match the optical axis L. The light collector 12 is arranged at a position close to the light source 4. The flange 11 is arranged at a position farther from the light source 4 than the light collector 12.

  A hollow portion 13 penetrating through the collar portion 11 and the light focusing portion 12 is formed in the focusing lens 9. The hollow portion 13 is a cylindrical space centered on the optical axis L. The hollow portion 13 opens at the surface 11 a of the flange portion 11. The hollow portion 13 opens at the surface 12 a of the light collecting portion 12. Surface 11a and surface 12a face in opposite directions. In the example shown in the present embodiment, the surface 11a and the surface 12a are respectively flat.

  The outer peripheral surface 12b of the light collecting section 12 has the smallest diameter at a portion close to the light source section 4. The outer peripheral surface 12b increases in diameter as approaching the flange 11 (the surface 11a of the flange 11). The central axis of the outer peripheral surface 12b coincides with the optical axis L. The outer peripheral surface 12b is a curve slightly bulging outward in a cross section including the central axis of the light collector 12. In the present invention, such a shape is also included in the truncated cone shape. The periphery of the hollow portion 13 penetrating the light collector 12 is surrounded by the outer peripheral surface 12b.

  The diameter of the flange 11 is larger than the diameter of the light collector 12. In the example shown in the present embodiment, the optical axis L is orthogonal to the surface 11 a of the flange 11.

  The adjustment lens 10 has a shape obtained when one plate in contact with the optical axis L is rotated about the optical axis L as a whole. The adjustment lens 10 includes, for example, a disc-shaped flange 14 and a columnar adjustment unit 15. The central axis of the flange 14 and the central axis of the adjustment unit 15 respectively match the optical axis L. The adjustment unit 15 is arranged at a position close to the light source unit 4. The flange 14 is arranged at a position farther from the light source 4 than the adjuster 15.

  The diameter of the adjusting part 15 is smaller than the diameter of the hollow part 13. The adjustment unit 15 is partially disposed in the hollow portion 13. A cylindrical space is formed between the converging lens 9 and the portion of the adjusting unit 15 disposed in the hollow portion 13. The portion of the adjustment unit 15 that is not arranged in the hollow portion 13 is arranged at a position farther from the light source unit 4 than the condenser lens 9 so as to protrude from the surface 11a. That is, the adjusting portion 15 is arranged so as to be inserted into the hollow portion 13 from the front surface 11 a side of the flange portion 11.

  The adjustment unit 15 is disposed, for example, at a portion that penetrates the flange 11 and has a tip portion formed on the light collecting unit 12 of the hollow portion 13. That is, the surface 15 a of the adjustment unit 15 reaches a portion formed in the light collection unit 12 of the hollow portion 13. The surface 15 a is a surface facing the light source unit 4. The surface 15 a faces the opposite side of the surface 11 a of the flange 11.

  The diameter of the flange 14 is, for example, the same as the diameter of the flange 11. The flange 14 is disposed at a position farther from the light source 4 than the condenser lens 9.

  The holder section 8 holds the light source section 4 and the lens 7. In the example shown in the present embodiment, the lens 7 includes the condenser lens 9 and the adjustment lens 10. Therefore, the holder section 8 includes a first holder 16 and a second holder 17. The first holder 16 holds the condenser lens 9. The second holder 17 holds the adjustment lens 10. The second holder 17 is fitted into the first holder 16 and is supported by the first holder 16.

  The first holder 16 has a cylindrical shape that opens on one side as a whole. The central axis of the first holder 16 coincides with the optical axis L. The light source unit 4 is provided at the center of the bottom surface of the first holder 16. A groove 18 is formed annularly on the inner peripheral surface near the opening of the first holder 16. The condenser lens 9 is fixed to the first holder 16 in a state where the edge of the flange 11 is arranged in the groove 18. In the section including the optical axis L, a slight gap is formed between the condenser lens 9 and the light source unit 4. A plurality of grooves 19 are formed obliquely on the outer peripheral surface of the first holder 16.

  The second holder 17 has a cylindrical shape as a whole. The central axis of the second holder 17 coincides with the optical axis L. A step is formed inside the second holder 17. That is, the second holder 17 includes a large-diameter portion 20 having a large inner diameter and a small-diameter portion 21 having a small inner diameter. The inner diameter of the large diameter portion 20 is slightly larger than the outer diameter of the first holder 16. The inside diameter of the small diameter portion 21 is the same as the inside diameter of the first holder 16. The outer diameter of the large diameter portion 20 and the outer diameter of the small diameter portion 21 are the same.

  The large diameter portion 20 is arranged outside the first holder 16 so as to surround the periphery of the first holder 16. The large diameter part 20 includes a plurality of convex parts 22 protruding from the inner peripheral surface. The protrusion 22 is disposed in the groove 19 formed in the first holder 16.

  A groove 23 is formed annularly on the inner peripheral surface of the small diameter portion 21. The adjustment lens 10 is fixed to the second holder 17 with the edge of the flange 14 arranged in the groove 23. The adjustment part 15 protrudes toward the light source part 4 from the surface facing the surface 11 a of the flange part 14.

  When the second holder 17 is rotated with respect to the first holder 16, the protrusion 22 is guided by the groove 19, and the second holder 17 moves along the optical axis L with respect to the first holder 16. Thereby, the holder part 8 expands and contracts.

  FIGS. 5A and 2 show a state in which the holder portion 8 is most contracted. When the second holder 17 is rotated in one direction with respect to the first holder 16, the holder portion 8 contracts until the step formed inside the second holder 17 contacts the end surface of the first holder 16. In the arrangement shown in FIG. 5A, the flange 14 is closest to the flange 11. The adjusting portion 15 penetrates the flange portion 11, and a tip portion is disposed at a portion formed on the light collecting portion 12 of the hollow portion 13. The surface 15 a of the adjustment unit 15 is closest to the light source unit 4.

  When the second holder 17 is rotated in the other direction with respect to the first holder 16, the holder portion 8 extends. The flange 14 moves away from the flange 11, and the adjusting unit 15 moves in the hollow 13 along the optical axis L. The surface 15 a of the adjustment unit 15 moves away from the light source unit 4.

  FIG. 5B and FIG. 3 show a state in which the holder portion 8 is extended most. In the arrangement shown in FIG. 5B, the flange 14 is farthest from the flange 11. The adjusting section 15 has only the distal end portion disposed in the hollow portion 13. The surface 15 a of the adjustment unit 15 is arranged at a position farthest from the light source unit 4.

Next, the light distribution characteristics of the lens 7 will be described.
The light source unit 4 emits light toward the hollow part 13. The light emitted from the light source unit 4 travels through the hollow part 13 and hits the surface 15 a of the adjustment unit 15 and the inner peripheral surface 9 a of the condenser lens 9. The inner peripheral surface 9a is a surface that forms the hollow portion 13.

  In the arrangement shown in FIG. 5A, the path of the light emitted from the light source unit 4 is divided into an optical path A, an optical path B, and an optical path C. The optical path A is a path through which the light that enters the adjustment unit 15 from the surface 15a and is radiated from the surface 14a of the flange 14 without being reflected by the outer peripheral surface 15b of the adjustment unit 15. The surface 14a faces in the same direction as the surface 11a of the flange portion 11. The optical path B is a path through which the light that enters the adjustment unit 15 from the surface 15a, is reflected by the outer peripheral surface 15b of the adjustment unit 15, and then radiates from the surface 14a of the flange unit 14 travels. The optical path C is a path through which the light that enters the light condensing portion 12 from the inner peripheral surface 9a, is reflected by the outer peripheral surface 12b of the light converging portion 12, and then radiates from the surface 11a of the flange portion 11 travels.

  The light traveling along the optical path A travels linearly from the surface 15a of the adjusting portion 15 to the surface 14a of the flange portion 14. The adjustment lens 10 is formed such that the optical path A starting from the emission center does not intersect the optical axis L in a cross section including the optical axis L. Of the light traveling along the optical path A starting from the emission center, the light traveling along the optical path A other than the optical axis L is slightly apart from the optical axis L. The adjustment lens 10 is formed such that the optical path B intersects the optical axis L in a cross section including the optical axis L. That is, the light traveling along the optical path B gradually approaches the optical axis L after being reflected by the outer peripheral surface 15b. Thereafter, the light traveling along the optical path B proceeds to the opposite side of the optical axis L and gradually moves away from the optical axis L. The condenser lens 9 is formed such that the optical path C is nearly parallel to the optical axis L.

  In the arrangement shown in FIG. 5B, the path of the light emitted from the light source unit 4 is divided into an optical path A in addition to the optical path A, the optical path B, and the optical path C. The optical path D is a path through which the light radiated from the condenser lens 9 travels after entering the condenser section 12 from the inner peripheral surface 9a and being reflected by the surface 11a of the flange section 11. Light traveling along the optical path D is totally reflected by the surface 11a. Light traveling along the optical path D impinges on the first holder 16. For example, by performing black processing on the inner peripheral surface of the first holder 16, light traveling along the optical path D can be absorbed.

  FIG. 6 is a light distribution diagram of light emitted from the light emitting device 6. The solid line shown in FIG. 6 corresponds to the arrangement shown in FIG. The broken line shown in FIG. 6 corresponds to the arrangement shown in FIG. Light traveling along the optical path C greatly contributes to the central luminous intensity. The center luminous intensity is the luminous intensity on the optical axis L. Light traveling along the optical path C greatly contributes to the half beam angle. The ビ ー ム beam angle is a beam angle at a position where the luminous intensity becomes a value of に 対 し て of the central luminous intensity. The light traveling along the optical path C hardly changes between the arrangement shown in FIG. 5A and the arrangement shown in FIG. Therefore, in each arrangement, the center luminous intensity and the half beam angle hardly change.

  The light traveling along the optical path A and the light traveling along the optical path B greatly contribute to the flare light. The flare light is light (diffused light) that spreads outside the set irradiation range. The flare light corresponds to a portion that spreads to the bottom of the chevron waveform in the light distribution diagram shown in FIG. In the arrangement shown in FIG. 5B, since the adjusting unit 15 moves away from the light source unit 4, the light traveling along the optical path B is greatly reduced from the arrangement shown in FIG. Most of the light traveling along the optical path B in the arrangement shown in FIG. 5A travels along the optical path D in the arrangement shown in FIG. Therefore, in the arrangement shown in FIG. 5A and the arrangement shown in FIG. 5B, the flare light greatly increases and decreases (see a range E in FIG. 6). That is, in the arrangement shown in FIG. 5A, a large amount of flare light exists. By changing the arrangement shown in FIG. 5A to the arrangement shown in FIG. 5B, flare light can be reduced.

  By employing the lens 7 having the above configuration, it is possible to control the intensity of flare light without greatly changing the central luminous intensity and the beam angle. That is, by adjusting the amount of the adjusting portion 15 disposed in the hollow portion 13, the degree of spread of light can be controlled.

  In the light emitting device 6 having the above-described configuration, the amount of the adjusting portion 15 disposed in the hollow portion 13 can be adjusted by rotating the second holder 17 with respect to the first holder 16. A desired light distribution state can be obtained by a simple operation.

  In the present embodiment, light from light source unit 4 is directly radiated from the gap between adjustment unit 15 and condenser lens 9 because the distal end (surface 15 a) of adjustment unit 15 is always disposed in hollow portion 13. An example has been described in which the situation is prevented. However, the intensity of the flare light can be controlled without greatly changing the beam angle even if the tip portion (the surface 15a) of the adjusting portion 15 is not disposed in the hollow portion 13.

  In the present embodiment, an example in which the surfaces 11a, 12a, 14a, and 15a are flat has been described. Each surface may not be flat as long as the same function as the function disclosed in the present embodiment can be realized.

Embodiment 2 FIG.
FIG. 7 is a diagram showing a cross section of the light emitting device 6 according to Embodiment 2 of the present invention. The configuration other than the light emitting device 6 is the same as the configuration disclosed in the first embodiment. The light emitting device 6 according to the present embodiment is different from the light emitting device 6 disclosed in the first embodiment in that the light incident portion of the condenser lens 9 has multiple stages. Other configurations of the light emitting device 6 are the same as the configurations disclosed in the first embodiment.

  In the example shown in the present embodiment, hollow portion 13 has a cylindrical portion and a truncated cone portion. The portion of the hollow portion 13 near the light source portion 4 has a cylindrical shape. This part of the hollow part 13 has the same diameter. The portion of the hollow portion 13 apart from the light source portion 4 has a truncated cone shape. The diameter of this portion of the hollow portion 13 becomes smaller as it approaches the surface 11a of the flange portion 11 from a columnar portion.

  FIG. 7A shows a state where the holder portion 8 is most contracted. FIG. 7A illustrates an arrangement in which the surface 15 a of the adjustment unit 15 is closest to the light source unit 4. FIG. 7B shows a state in which the holder portion 8 is extended most. FIG. 7B shows an arrangement in which the surface 15 a of the adjustment unit 15 is farthest from the light source unit 4. Light emitted from the light source unit 4 enters the condenser lens 9 from the inner peripheral surface 9a. As shown in FIG. 7, the angle of the inner peripheral surface 9a of the condenser lens 9 can increase the intensity of the flare light.

  In the arrangement shown in FIG. 7A, the path of the light emitted from the light source unit 4 is divided into an optical path A, an optical path B, and an optical path C. For example, light traveling along the optical path C impinges on the inner peripheral surface 9a at the cylindrical portion of the hollow portion 13. The light that travels along the optical path C does not hit the inner peripheral surface 9a at the portion of the hollow portion 13 having a truncated cone shape.

  In the arrangement shown in FIG. 7B, the path of the light emitted from the light source unit 4 is divided into an optical path A in addition to the optical path A, the optical path B, and the optical path C. The light traveling along the optical path D impinges on the inner peripheral surface 9a, for example, at a portion of the hollow portion 13 having a truncated cone shape. Most of the light traveling along the optical path D is totally reflected by the surface 11a. Part of the light traveling along the optical path D is emitted from the surface 11a. This light emitted from the surface 11 a impinges on the second holder 17. For example, by performing black processing on the inner peripheral surface of the second holder 17, light traveling along the optical path D can be absorbed.

Embodiment 3 FIG.
FIG. 8 is a diagram showing a cross section of the light emitting device 6 according to Embodiment 3 of the present invention. The configuration other than the light emitting device 6 is the same as the configuration disclosed in the first embodiment. The light emitting device 6 according to the present embodiment is different from the light emitting device 6 disclosed in the first embodiment in that the condenser lens 9 is formed into a Fresnel. The other configuration of the light emitting device 6 is the same as the configuration disclosed in Embodiment 1 or 2.

  In the example shown in FIG. 8, the condenser lens 9 has an internal Fresnel part 24. FIG. 8A shows a state where the holder portion 8 is most contracted. FIG. 8A illustrates an arrangement in which the surface 15 a of the adjustment unit 15 is closest to the light source unit 4. FIG. 8B shows a state in which the holder portion 8 is extended most. FIG. 8B shows an arrangement in which the surface 15 a of the adjustment unit 15 is farthest from the light source unit 4. Light emitted from the light source unit 4 enters the condenser lens 9 from the inner peripheral surface 9a. As shown in FIG. 8, by providing the internal Fresnel portion 24 in the condenser lens 9, it is possible to reduce flare light while reducing light beam attenuation.

  In the arrangement shown in FIG. 8A, the path of the light emitted from the light source unit 4 is divided into an optical path A, an optical path B, and an optical path C. For example, in the arrangement shown in FIG. 8A, the adjusting portion 15 penetrates a small diameter portion of the hollow portion 13. The surface 15 a of the adjusting section 15 is arranged at a large diameter portion of the hollow section 13. For this reason, the light traveling along the optical path C hits the inner peripheral surface 9 a at the large diameter portion of the hollow portion 13. Light traveling along the optical path C does not hit the inner peripheral surface 9a in the small diameter portion of the hollow portion 13.

  In the arrangement shown in FIG. 8B, the path of the light emitted from the light source unit 4 is divided into an optical path D, an optical path F, in addition to the optical paths A, B, and C. Light that travels along the optical path D impinges on the inner peripheral surface 9a at, for example, a small diameter portion of the hollow portion 13. The optical path F is a path through which the light that enters the light-collecting portion 12 from the inner peripheral surface 9a and is reflected by the Fresnel surface 9a1 and then radiated from the surface 11a of the flange portion 11 travels. Light traveling along the optical path F impinges on the inner peripheral surface 9a at, for example, a small diameter portion of the hollow portion 13. In the configuration disclosed in the first embodiment, part of the light applied to the first holder 16 can be emitted from the surface 11a. Thereby, optical efficiency can be improved.

  FIG. 9 is a sectional view showing another example of the light emitting device 6 according to Embodiment 3 of the present invention. FIG. 8 shows an example in which the condenser lens 9 has a reflective internal Fresnel portion 24. The condenser lens 9 may have a refractive internal Fresnel part 24 as shown in FIG. FIG. 9A shows a state where the holder unit 8 is most contracted. FIG. 9B shows a state in which the holder portion 8 is extended most. Even when the configuration shown in FIG. 9 is adopted, the same effect as in the case where the configuration shown in FIG. 8 is adopted can be obtained.

  In the arrangement shown in FIG. 9A, the path of the light emitted from the light source unit 4 is divided into an optical path A, an optical path B, and an optical path C. For example, light traveling along the optical path C hits the inner peripheral surface 9a at the large diameter portion of the hollow portion 13. Light traveling along the optical path C does not hit the inner peripheral surface 9a in the small diameter portion of the hollow portion 13.

  In the arrangement shown in FIG. 9B, the path of the light emitted from the light source unit 4 is divided into an optical path A, an optical path B, and an optical path C, as well as an optical path D and an optical path G. Light that travels along the optical path D impinges on the inner peripheral surface 9a at, for example, a small diameter portion of the hollow portion 13. The optical path G is a path through which the light radiated from the front surface 11a of the flange portion 11 enters the light condensing portion 12 from the Fresnel surface 9a1. In the configuration disclosed in the first embodiment, part of the light applied to the first holder 16 can be emitted from the surface 11a. Thereby, optical efficiency can be improved.

  The internal Fresnel portions 24 shown in FIGS. 8 and 9 may be formed in multiple stages.

Embodiment 4 FIG.
FIG. 10 is a diagram showing a cross section of the light emitting device 6 according to Embodiment 4 of the present invention. The configuration other than the light emitting device 6 is the same as the configuration disclosed in the first embodiment. The light emitting device 6 according to the present embodiment is different from the light emitting device 6 disclosed in the first embodiment in that the light incident portion of the adjustment lens 10 is not flat. Other configurations of the light emitting device 6 are the same as the configurations disclosed in any of Embodiments 1 to 3.

  In the example shown in the present embodiment, the surface 15a of the adjustment unit 15 is concave. Thereby, the angles of the optical paths A and B with respect to the optical axis L can be increased.

  FIG. 11 is a sectional view showing another example of the light emitting device 6 according to Embodiment 4 of the present invention. FIG. 11 shows an example in which the surface 15a of the adjustment unit 15 has a convex shape. Thereby, the angles of the optical paths A and B with respect to the optical axis L can be reduced.

  With the configuration shown in the present embodiment, the range of flare light can be adjusted.

  In addition, as for the lens 7 shown in the first to fourth embodiments, a diffused shape may be applied to each surface to prevent illuminance unevenness or color unevenness. As the diffusion shape, for example, texturing may be performed. Each surface may have a facet shape or a polyhedral shape. A diffusion sheet may be provided as a measure against illuminance unevenness or color unevenness. Further, in consideration of formability, a portion described as a vertical surface may be tapered.

Embodiment 5 FIG.
In the first to fourth embodiments, an example has been described in which the converging lens 9 and the adjusting lens 10 are provided to control the intensity of flare light without greatly changing the central luminous intensity and the beam angle. In the present embodiment, an illumination lens that can perform light distribution control while maintaining a state of good light efficiency will be described.

  FIG. 12 is a diagram showing a cross section of the light emitting device 6 according to Embodiment 5 of the present invention. The configuration other than the light emitting device 6 is the same as the configuration disclosed in the first embodiment. Hereinafter, a configuration different from the configurations disclosed in Embodiments 1 to 4 will be described. Items not described in the present embodiment are the same as those disclosed in any of Embodiments 1 to 4.

  In the luminaire described in Patent Literature 1, a convex lens is provided in a moving cylinder. The beam angle can be changed by moving the movable cylinder in the optical axis direction. However, with the lighting apparatus described in Patent Document 1, it is difficult to control light that spreads over a wide angle when a small convex lens is used. Therefore, there is a problem that light loss is large. In order to suppress light loss, a large convex lens must be used. Therefore, in the present embodiment, there is proposed an illumination lens that does not need to be upsized and that can perform light distribution control while maintaining a state of good light efficiency.

  The light emitting device 6 includes, for example, the light source unit 4, the lens 25, and the holder unit 8. The configuration of the light source unit 4 is the same as the configuration disclosed in the first embodiment.

  In the light emitting device 6, light distribution control is performed by the lens 25. That is, the lens 25 is a member that controls light emitted from the light source unit 4 to a desired light distribution. The symbol L in FIG. 12 indicates the optical axis of the lens 25. The optical axis L coincides with a normal passing through the light emission center of the light source unit 4.

  The lens 25 as a whole has a shape obtained when one plate in contact with the optical axis L is rotated about the optical axis L. The lens 25 includes, for example, a disc-shaped flange 26 and a truncated cone-shaped light distribution unit 27. The central axis of the flange 26 and the central axis of the light distribution unit 27 respectively match the optical axis L. The light distribution unit 27 is arranged at a position close to the light source unit 4. The flange 26 is arranged at a position farther from the light source 4 than the light distribution unit 27.

  A concave portion 28 is formed in the light distribution section 27. The concave portion 28 is a cylindrical or truncated conical space having the optical axis L as a central axis. The recess 28 opens at the surface 27 a of the light distribution unit 27. The front surface 27a is a surface facing the light source unit 4 side. FIG. 12 shows an example in which the diameter increases as the inner peripheral surface 27 b of the light distribution unit 27 approaches the light source unit 4. The inner peripheral surface 27b forms a concave portion 28. The diameter of the inner peripheral surface 27b may be the same throughout. FIG. 12 shows an example in which the inner surface 27c of the light distribution unit 27 has a convex shape. The inner surface 27c is a surface facing the light source unit 4 side. The inner surface 27c forms a recess 28. The inner surface 27c may be flat.

  The outer peripheral surface 27d of the light distribution unit 27 has the smallest diameter at a portion close to the light source unit 4. The diameter of the outer peripheral surface 27d increases as it approaches the flange 26 (the surface 26a of the flange 26). The front surface 26 a is a surface facing the opposite side of the light source unit 4. Surface 26a and surface 27a face in opposite directions. In the example shown in the present embodiment, the surface 26a and the surface 27a are respectively flat. The central axis of the outer peripheral surface 27d coincides with the optical axis L. The outer peripheral surface 27d is a curve slightly expanding outward in a cross section including the central axis of the light distribution unit 27. In the present invention, such a shape is also included in the truncated cone shape. The periphery of the concave portion 28 formed in the light distribution portion 27 is surrounded by an outer peripheral surface 27d.

  The diameter of the flange 26 is larger than the diameter of the light distribution unit 27. In the example shown in the present embodiment, the optical axis L is orthogonal to the surface 26a of the flange 26.

  The holder unit 8 holds the light source unit 4 and the lens 25. The holder section 8 includes a first holder 16 and a second holder 17. The first holder 16 holds the light source unit 4. The second holder 17 holds the lens 25. The second holder 17 is fitted into the first holder 16 and is supported by the first holder 16.

  The configuration of the first holder 16 in the present embodiment is different from the configuration disclosed in the first embodiment in that the first holder 16 does not hold the condenser lens 9. That is, the groove 18 is not formed in the first holder 16. The other configuration of the first holder 16 is the same as the configuration disclosed in the first embodiment.

  The second holder 17 in the present embodiment is different from the configuration disclosed in the first embodiment in holding the lens 25. The lens 25 is fixed to the second holder 17 with the edge of the flange 26 arranged in the groove 23. The other configuration of the second holder 17 is the same as the configuration disclosed in the first embodiment.

  When the second holder 17 is rotated with respect to the first holder 16, the protrusion 22 is guided by the groove 19, and the second holder 17 moves along the optical axis L with respect to the first holder 16. Thereby, the holder part 8 expands and contracts.

  (A) of FIG. 12 shows a state where the holder unit 8 is most contracted. In the arrangement shown in FIG. 12A, the lens 25 comes closest to the light source unit 4. (B) of FIG. 12 shows a state where the holder portion 8 is extended most. In the arrangement shown in FIG. 12B, the lens 25 is arranged at a position farthest from the light source unit 4. The distance between the lens 25 and the light source unit 4 can be adjusted by expanding and contracting the holder unit 8.

Next, the light distribution characteristics of the lens 25 will be described.
The light source unit 4 emits light toward the concave portion 28. The light emitted from the light source unit 4 travels through the concave portion 28 and strikes the inner surface 27c and the inner peripheral surface 27b where the concave portion 28 is formed.

  In the arrangement shown in FIG. 12A, the path of the light emitted from the light source unit 4 is divided into an optical path H and an optical path J. The optical path H is a path through which the light emitted from the surface 26a of the flange 26 travels without entering the light distribution section 27 from the inner surface 27c and being reflected by the outer peripheral surface 27d. The optical path J is a path through which light that enters the light distribution unit 27 from the inner peripheral surface 27b, is reflected by the outer peripheral surface 27d, and then radiates from the surface 26a of the flange 26 proceeds. The light distribution unit 27 is formed such that the optical path H does not cross the optical axis L in a cross section including the optical axis L. That is, light traveling along the optical path H other than the optical axis L gradually moves away from the optical axis L. The light distribution unit 27 is formed so that the optical path J intersects the optical axis L in a cross section including the optical axis L. That is, light traveling along the optical path J gradually approaches the optical axis L after being emitted from the surface 26a. Thereafter, the light traveling along the optical path J proceeds to the opposite side of the optical axis L and gradually moves away from the optical axis L.

  In the arrangement shown in FIG. 12B, the path of the light emitted from the light source unit 4 is divided into an optical path H in addition to the optical path H and the optical path J. The optical path K is a path through which light that strikes the first holder 16 without entering the light distribution unit 27. Since the lens 25 is separated from the light source unit 4, light traveling along the optical path K is generated. Further, as the lens 25 moves away from the light source unit 4, the angle formed by the optical path H and the optical axis L in the cross section including the optical axis L becomes smaller. Similarly, the angle between the optical path J and the optical axis L becomes smaller. In the arrangement shown in FIG. 12B, the optical path H and the optical path J are almost parallel to the optical axis L.

  FIG. 13 is a light distribution diagram of light emitted from the light emitting device 6. The solid line shown in FIG. 13 corresponds to the arrangement shown in FIG. The broken line shown in FIG. 13 corresponds to the arrangement shown in FIG. In the arrangement shown in FIG. 12A, the light emitted from the light source unit 4 spreads at a wide angle. For this reason, the center luminous intensity decreases and the half beam angle increases. In the arrangement shown in FIG. 12B, the light emitted from the light source unit 4 spreads at a narrow angle. Therefore, as compared with the arrangement shown in FIG. 12A, the central luminous intensity is higher and the half beam angle is smaller.

  By employing the lens 25 having the above configuration, it is possible to perform light distribution control while maintaining a state in which light efficiency is good. There is no need to enlarge the lens 25. Further, it is possible to provide the light emitting device 6 including the lens 25 and the lighting fixture 1.

  In the lens 25 disclosed in the present embodiment, the inner peripheral surface 27b and the outer peripheral surface 27d may be formed in multiple stages in order to prevent interference of reflected light. Further, the lens 25 may be a Fresnel lens. In consideration of formability, a portion described as a vertical surface may be tapered.

  Further, with respect to the lens 25, a diffused shape may be provided on each surface for measures against illuminance unevenness or color unevenness. As the diffusion shape, for example, texturing may be performed. Each surface may have a facet shape or a polyhedral shape. A diffusion sheet may be provided as a measure against illuminance unevenness or color unevenness.

  The configuration of the holder 8 disclosed in each embodiment is an example. The holder portion 8 may have a shape that can be fixed stepwise, as in the configuration described in JP-A-2012-221969. Further, the first holder 16 may be formed integrally with the main body 5. A protrusion corresponding to the protrusion 22 may be formed in the first holder 16, and a groove corresponding to the groove 19 may be formed in the second holder 17.

  The configuration of the light source unit 4 disclosed in each embodiment is an example. The light source unit 4 may be a package type instead of the COB type. Other types of light source units 4 may be employed.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Lamp 3 Power supply case 4 Light source part 5 Main body part 6 Light emitting device 7 Lens (lighting lens)
8 Holder 9 Condensing lens (first lens)
9a, 27b Inner peripheral surface 10 Adjusting lens (second lens)
11, 14, 26 Flange 11a Surface (first surface)
12 Condensing part 12a, 14a, 26a, 27a Surface 12b, 15b, 27d Outer peripheral surface 13 Hollow part 15 Adjusting part 15a Surface (second surface)
16 First Holder 17 Second Holder 18, 19, 23 Groove 20 Large Diameter 21 Small Diameter 22 Convex 24 Internal Fresnel 25 Lens 27 Light Distributor 27c Inner Surface 28 Concave

Claims (10)

A first lens having an outer peripheral surface whose diameter increases as approaching the first surface, wherein a hollow portion is formed around the outer peripheral surface, the hollow portion being open at the first surface;
A second lens having a cylindrical adjustment portion that is not hollow , wherein the adjustment portion can move the hollow portion along a central axis of the outer peripheral surface;
Lighting lens with.   2. The illumination lens according to claim 1, wherein the adjustment unit has a second surface facing the opposite side of the first surface disposed in the hollow portion. 3.   The illumination lens according to claim 2, wherein the second surface has a convex shape or a concave shape. The first surface is flat;
4. The illumination lens according to claim 1, wherein the adjustment unit moves the hollow portion along a direction orthogonal to the first surface. 5. At least a part of the hollow portion has a columnar shape,
The illumination lens according to any one of claims 1 to 4, wherein a center axis of the adjustment unit is arranged on the same straight line as a center axis of the cylindrical portion of the hollow portion.   The illumination lens according to claim 5, wherein the hollow portion has a diameter that decreases from a cylindrical portion toward the first surface. The first lens includes a disc-shaped flange and a truncated cone-shaped light collector,
The illumination lens according to any one of claims 1 to 6, wherein the hollow portion penetrates the flange portion and the light collecting portion. The illumination lens according to any one of claims 1 to 7,
A light source unit configured to irradiate light on an inner peripheral surface of the first lens forming the hollow surface and the second surface of the adjustment unit facing the opposite side of the first surface;
A holder unit for holding the illumination lens,
A light emitting device comprising: The holder section,
A cylindrical first holder for holding the first lens;
A cylindrical second holder that holds the second lens and is movable along a central axis of the first holder;
The light emitting device according to claim 8, further comprising: The light emitting device according to claim 8 or claim 9,
A main body unit to which the light emitting device is attached, and a heat radiating unit for radiating heat generated from the light emitting device;
Lighting equipment with.

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