JP2016162497A - Lens for illumination, light emitting device, and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens for illumination which controls the intensity of flare light without significantly changing the central luminous intensity or the beam angle.SOLUTION: A lens for illumination includes: a condenser lens 9; and an adjustment lens 10. The condenser lens 9 has an outer peripheral surface 12b. In the outer peripheral surface 12b, a diameter becomes larger toward a surface 11a. A hollow part 13 is formed in the condenser lens 9. The hollow part 13 is surround by the outer peripheral surface 12b. The hollow part 13 opens on the surface 11a. The adjustment lens 10 has an adjustment part 15 having a circular column. The adjustment part 15 may move in the hollow part 13 along a central axis of the outer peripheral surface 12b.SELECTED DRAWING: Figure 5

Description

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

  Patent Literature 1 describes a lighting fixture. The lighting fixture described in Patent Document 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 moving cylinder in the optical axis direction.

JP 2007-299679 A

  In the luminaire described in Patent Document 1, when the movable cylinder is moved in the optical axis direction, the central luminous intensity changes greatly. Further, when the moving cylinder is moved in the optical axis direction, the beam angle changes greatly. In the luminaire described in Patent Document 1, flare light could not be changed without greatly changing the central luminous intensity or the beam angle. The flare light is light (diffused light) that spreads outside the set irradiation range.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide an illumination lens capable of controlling the intensity of flare light without greatly changing the central luminous intensity or the beam angle. Another object of the present invention is to provide a light emitting device and a luminaire provided with such an illumination lens.

  The illumination lens according to the present invention has an outer peripheral surface whose diameter increases as it approaches the first surface, a hollow portion surrounded by the outer peripheral surface is formed, and the hollow portion opens at the first surface. A lens and a second lens having a columnar adjustment portion, the adjustment portion being movable 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 the inner surface of the first lens that forms the second surface and the hollow portion of the adjustment unit facing the opposite side of the first surface, A holder portion for holding an illumination lens.

  The lighting fixture which concerns on this invention is provided with the said light-emitting device and the main-body part which has a heat radiating part for radiating the heat which the light-emitting device is attached and generate | occur | produces from a light-emitting device.

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

It is a perspective view which shows the lighting fixture in Embodiment 1 of this invention. It is a side view which shows a lamp. It is a side view which shows a lamp. It is the figure which decomposed | disassembled the holder part. It is a figure which shows the cross section of a light-emitting device. It is a light distribution diagram of the light irradiated from the light-emitting device. It is a figure which shows the cross section of the light-emitting device in Embodiment 2 of this invention. It is a figure which shows the cross section of the light-emitting device in Embodiment 3 of this invention. It is sectional drawing which shows the other example of the light-emitting device in Embodiment 3 of this invention. It is a figure which shows the cross section of the light-emitting device in Embodiment 4 of this invention. It is sectional drawing which shows the other example of the light-emitting device in Embodiment 4 of this invention. It is a figure which shows the cross section of the light-emitting device in Embodiment 5 of this invention. It is a light distribution diagram of the light irradiated from the light-emitting device.

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

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

  The luminaire 1 includes a lamp 2 and a power supply case 3, for example. 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 accommodated 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 a main body 5 and a light emitting device 6, for example. The light emitting device 6 is attached to the main body 5. An attachment surface (not shown) for attaching 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 5 includes a heat radiating part 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 radiating part. 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 unit 8 in addition to the light source unit 4. 2 and 3 are side views showing the lamp 2. FIG. 4 is an exploded view of the holder portion 8. FIG. 5 is a view showing 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 unit 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. A wavelength conversion member is a member which seals a light emitting element. The wavelength conversion member has a certain translucency. For example, an LED element that emits blue light is used as the light emitting element. The light emitting element is mounted on the wiring pattern of the 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 the 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 as a whole has a shape obtained when a single plate disposed at a position away from the optical axis L is rotated around the optical axis L. The condensing lens 9 includes, for example, a disc-shaped flange portion 11 and a truncated cone-shaped condensing portion 12. The central axis of the collar part 11 and the central axis of the condensing part 12 correspond to the optical axis L, respectively. The light collecting unit 12 is disposed at a position close to the light source unit 4. The collar unit 11 is disposed at a position farther from the light source unit 4 than the light collecting unit 12.

  The condensing lens 9 is formed with a hollow portion 13 that penetrates the flange portion 11 and the condensing portion 12. The hollow portion 13 is a cylindrical space having the optical axis L as a central axis. The hollow portion 13 opens at the surface 11 a of the flange portion 11. The hollow part 13 opens at the surface 12 a of the light collecting part 12. The surface 11a and the surface 12a face in opposite directions. In the example shown in the present embodiment, the surface 11a and the surface 12a are flat.

  The outer peripheral surface 12 b of the light collecting unit 12 has the smallest diameter near the light source unit 4. The outer peripheral surface 12b increases in diameter as it approaches 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 that slightly swells outward in a cross section including the central axis of the light collecting portion 12. In the present invention, such a shape is also included in the truncated cone shape. The hollow portion 13 penetrating the light collecting portion 12 is surrounded by the outer peripheral surface 12b.

  The diameter of the collar portion 11 is larger than the diameter of the light collecting portion 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 as a whole has a shape obtained when a single plate in contact with the optical axis L is rotated around the optical axis L. The adjustment lens 10 includes, for example, a disc-shaped flange portion 14 and a columnar adjustment portion 15. The central axis of the collar part 14 and the central axis of the adjustment part 15 are respectively coincident with the optical axis L. An adjustment unit 15 is disposed at a position close to the light source unit 4. The collar part 14 is arranged at a position farther from the light source part 4 than the adjustment part 15.

  The diameter of the adjustment part 15 is smaller than the diameter of the hollow part 13. A part of the adjustment unit 15 is disposed in the hollow portion 13. A cylindrical space is formed between the portion disposed in the hollow portion 13 of the adjustment portion 15 and the condenser lens 9. The part of the adjusting unit 15 that is not arranged in the hollow part 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 adjustment part 15 is disposed so as to be inserted into the hollow part 13 from the surface 11 a side of the flange part 11.

  For example, the adjustment unit 15 penetrates the flange portion 11 and is disposed at a portion where the tip portion is formed in the light collecting portion 12 of the hollow portion 13. That is, the surface 15 a of the adjusting unit 15 reaches a portion formed in the light collecting unit 12 of the hollow portion 13. The front 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 portion 11.

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

  The holder unit 8 holds the light source unit 4 and the lens 7. In the example shown in the present embodiment, the lens 7 includes a condenser lens 9 and an adjustment lens 10. Therefore, the holder portion 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 supported by the first holder 16.

  The first holder 16 has a cylindrical shape that opens to 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. An annular groove 18 is formed 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 portion 11 is disposed in the groove 18. In a cross section including the optical axis L, a slight gap is formed between the condenser lens 9 and the light source unit 4. In addition, 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 inner diameter of the small diameter portion 21 is the same as the inner 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 disposed outside the first holder 16 so as to surround the first holder 16. The large diameter portion 20 includes a plurality of convex portions 22 projecting from the inner peripheral surface. The convex portion 22 is disposed in the groove 19 formed in the first holder 16.

  An annular groove 23 is formed 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 collar portion 14 disposed in the groove 23. The adjustment part 15 protrudes from the surface facing the surface 11a of the collar part 14 to the light source part 4 side.

  When the second holder 17 is rotated with respect to the first holder 16, the convex portion 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.

  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 is contracted until a step formed inside the second holder 17 comes into contact with the end surface of the first holder 16. In the arrangement shown in FIG. 5A, the flange portion 14 is closest to the flange portion 11. The adjustment part 15 penetrates the flange part 11, and the tip part is arranged at the part formed in the light collecting part 12 of the hollow part 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 collar part 14 moves away from the collar part 11, and the adjustment part 15 moves along the optical axis L along the hollow part 13. The surface 15 a of the adjustment unit 15 moves away from the light source unit 4.

  FIGS. 5B and 3 show a state in which the holder portion 8 is most extended. In the arrangement shown in FIG. 5B, the collar part 14 is farthest from the collar part 11. As for the adjustment part 15, only the front-end | tip part is arrange | positioned at the hollow part 13. FIG. The surface 15 a of the adjustment unit 15 is disposed at a position farthest from the light source unit 4.

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

  In the arrangement shown in FIG. 5A, the path of 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 light radiated from the surface 14a of the collar 14 travels without entering the adjustment unit 15 from the surface 15a and being reflected by the outer peripheral surface 15b of the adjustment unit 15. The surface 14 a is a surface facing in the same direction as the surface 11 a of the flange portion 11. The optical path B is a path through which light radiated from the surface 14a of the collar 14 travels after entering the adjustment unit 15 from the surface 15a and reflected by the outer peripheral surface 15b of the adjustment unit 15. The optical path C is a path through which light radiated from the surface 11a of the collar portion 11 travels after entering the light collecting portion 12 from the inner peripheral surface 9a and being reflected by the outer peripheral surface 12b of the light collecting portion 12.

  The light traveling along the optical path A travels linearly from the surface 15a of the adjustment unit 15 to the surface 14a of the flange 14. The adjusting lens 10 is formed so that the optical path A starting from the light emission center in the cross section including the optical axis L does not intersect the optical axis L. Of the light traveling on the optical path A starting from the light emission center, the light traveling on the optical path A other than the optical axis L is slightly away from the optical axis L. The adjustment lens 10 is formed so 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 on the optical path B travels to the opposite side of the optical axis L and gradually moves away from the optical axis L. The condenser lens 9 is formed so that the optical path C is almost parallel to the optical axis L.

  In the arrangement shown in FIG. 5B, the path of light emitted from the light source unit 4 is divided into an optical path D 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 emitted from the condensing lens 9 travels after entering the condensing unit 12 from the inner peripheral surface 9a and being reflected by the surface 11a of the flange portion 11. The light traveling in the optical path D is totally reflected by the surface 11a. Light traveling in the optical path D strikes the first holder 16. For example, the light traveling along the optical path D can be absorbed by applying a black treatment to the inner peripheral surface of the first holder 16.

  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. The light traveling along the optical path C greatly contributes to the central luminous intensity. The central luminous intensity is the luminous intensity on the optical axis L. The light traveling along the optical path C greatly contributes to the 1/2 beam angle. The 1/2 beam angle is a beam angle at a location where the luminous intensity is a value of 1/2 with respect to 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. For this reason, there is almost no change in the central luminous intensity and the 1/2 beam angle in each arrangement.

  The light traveling along the optical path A and the light traveling along the optical path B greatly contribute to the flare light. Flare light is light (diffused light) that spreads outside the set irradiation range. The flare light corresponds to a portion that spreads at the base of the mountain-shaped waveform in the light distribution diagram shown in FIG. In the arrangement shown in FIG. 5B, the adjustment unit 15 moves away from the light source unit 4, so that the light traveling on the optical path B is greatly reduced from the arrangement shown in FIG. Most of the light traveling on the optical path B in the arrangement shown in FIG. 5A travels on the optical path D in the arrangement shown in FIG. For this reason, flare light greatly increases / decreases in the arrangement shown in FIG. 5A and the arrangement shown in FIG. 5B (see range E in FIG. 6). That is, in the arrangement shown in FIG. 5A, a lot 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 adopting the lens 7 having the above configuration, the intensity of flare light can be controlled 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 light spreading can be controlled.

  In the light emitting device 6 having the above configuration, the amount of the adjusting unit 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, the tip (surface 15 a) of the adjustment unit 15 is always disposed in the hollow portion 13, so that light from the light source unit 4 is directly emitted from the gap between the adjustment unit 15 and the condenser lens 9. An example of preventing this has been described. However, the intensity of the flare light can be controlled without greatly changing the beam angle even if the tip end portion (surface 15a) of the adjustment 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. As long as the same function as the function disclosed in this embodiment can be realized, each surface may not be flat.

Embodiment 2. FIG.
FIG. 7 is a view 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 in the present embodiment is different from the light emitting device 6 disclosed in the first embodiment in that the light incident portions of the condenser lens 9 are multistage. 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, the hollow portion 13 has a columnar portion and a truncated cone portion. A portion of the hollow portion 13 close to the light source unit 4 has a cylindrical shape. This part of the hollow part 13 has the same diameter. A portion of the hollow portion 13 away from the light source unit 4 has a truncated cone shape. The diameter of this portion of the hollow portion 13 decreases as it approaches the surface 11a of the flange portion 11 from the portion having a cylindrical shape.

  FIG. 7A shows a state in which the holder portion 8 is most contracted. FIG. 7A shows 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 most extended. FIG. 7B shows an arrangement in which the surface 15 a of the adjustment unit 15 is farthest from the light source unit 4. The 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 intensity of flare light can be increased by providing an angle to the inner peripheral surface 9a of the condenser lens 9.

  In the arrangement shown in FIG. 7A, the path of 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, the light traveling on the optical path C hits the inner peripheral surface 9 a at the cylindrical portion of the hollow portion 13. The light traveling along the optical path C does not hit the inner peripheral surface 9a at the portion of the hollow portion 13 having the 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 the optical path D in addition to the optical path A, the optical path B, and the optical path C. The light traveling along the optical path D strikes the inner peripheral surface 9a at a portion of the hollow portion 13 having a truncated cone shape, for example. Most of the light traveling along the optical path D is totally reflected by the surface 11a. Part of the light traveling in the optical path D is emitted from the surface 11a. This light emitted from the surface 11 a strikes the second holder 17. For example, the light traveling along the optical path D can be absorbed by applying a black treatment to the inner peripheral surface of the second holder 17.

Embodiment 3 FIG.
FIG. 8 is a view showing a cross section of 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 in the present embodiment is different from the light emitting device 6 disclosed in the first embodiment in that the condenser lens 9 is made Fresnel. Other configurations of the light-emitting device 6 are the same as those disclosed in the first or second embodiment.

  In the example shown in FIG. 8, the condenser lens 9 has an internal Fresnel portion 24. FIG. 8A shows a state in which the holder portion 8 is most contracted. FIG. 8A shows 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 most extended. FIG. 8B shows an arrangement in which the surface 15 a of the adjustment unit 15 is farthest from the light source unit 4. The 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, flare light can be reduced while reducing the attenuation of the light flux.

  In the arrangement shown in FIG. 8A, the path of 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 adjustment portion 15 penetrates the small diameter portion of the hollow portion 13. The surface 15 a of the adjustment portion 15 is disposed on the large diameter portion of the hollow portion 13. For this reason, the light traveling along the optical path C strikes the inner peripheral surface 9 a at the large diameter portion of the hollow portion 13. The light traveling along the optical path C does not strike the inner peripheral surface 9a at the small diameter portion of the hollow portion 13.

  In the arrangement shown in FIG. 8B, the path of light emitted from the light source unit 4 is divided into an optical path D and an optical path F in addition to the optical path A, the optical path B, and the optical path C. The light traveling on the optical path D hits the inner peripheral surface 9a at the small diameter portion of the hollow portion 13, for example. The optical path F is a path through which the light emitted from the surface 11a of the collar portion 11 travels after entering the light collecting portion 12 from the inner peripheral surface 9a and being reflected by the Fresnel surface 9a1. The light traveling on the optical path F strikes the inner peripheral surface 9a at the small diameter portion of the hollow portion 13, for example. A part of the light applied to the first holder 16 in the configuration disclosed in the first embodiment 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 condensing lens 9 may have a refractive internal Fresnel portion 24 as shown in FIG. FIG. 9A shows a state in which the holder portion 8 is most contracted. FIG. 9B shows a state in which the holder portion 8 is most extended. Even if the configuration shown in FIG. 9 is adopted, the same effect as that obtained when the configuration shown in FIG. 8 is adopted can be obtained.

  In the arrangement shown in FIG. 9A, the path of 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, the light traveling on the optical path C strikes the inner peripheral surface 9 a at the large diameter portion of the hollow portion 13. The light traveling along the optical path C does not strike the inner peripheral surface 9a at 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 the optical path D and the optical path G in addition to the optical path A, the optical path B, and the optical path C. The light traveling on the optical path D hits the inner peripheral surface 9a at the small diameter portion of the hollow portion 13, for example. The optical path G is a path along which light that enters the light collecting unit 12 from the Fresnel surface 9a1 and radiates from the surface 11a of the collar unit 11 travels. A part of the light applied to the first holder 16 in the configuration disclosed in the first embodiment can be emitted from the surface 11a. Thereby, optical efficiency can be improved.

  Note that the internal Fresnel portion 24 shown in FIGS. 8 and 9 may be formed in multiple stages.

Embodiment 4 FIG.
FIG. 10 is a view 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 in 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 the first to third embodiments.

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

  FIG. 11 is a cross-sectional view showing another example of 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 angle with respect to the optical axis L of the optical paths A and B can be made small.

  If it is the structure shown in this Embodiment, the range of flare light can be adjusted.

  In addition, with respect to the lens 7 shown in the first to fourth embodiments, each surface may be provided with a diffusion shape for measures against illuminance unevenness or color unevenness. As the diffusion shape, for example, embossing may be performed. Each surface may be faceted or polyhedral. 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, examples in which the intensity of flare light is controlled without significantly changing the central luminous intensity and the beam angle by providing the condenser lens 9 and the adjustment lens 10 have been described. In the present embodiment, an illumination lens capable of performing light distribution control while maintaining a state of good light efficiency will be described.

  FIG. 12 is a view showing a cross section of 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. In the following, a configuration different from the configuration disclosed in the first to fourth embodiments will be described. Matters not described in the present embodiment are the same as the configurations disclosed in any of the first to fourth embodiments.

  In the luminaire described in Patent Document 1, a convex lens is provided on the movable cylinder. The beam angle can be changed by moving the moving cylinder in the optical axis direction. However, in the lighting apparatus described in Patent Document 1, it is difficult to control light spreading in a wide angle when a small convex lens is used. For this reason, there has been a problem that the loss of light is large. In order to suppress the loss of light, a large convex lens must be used. Therefore, this embodiment proposes an illumination lens that does not require an increase in size and that can perform light distribution control while maintaining a good light efficiency state.

  The light emitting device 6 includes a light source unit 4, a lens 25, and a holder unit 8, for example. 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. A symbol L in FIG. 12 indicates the optical axis of the lens 25. The optical axis L coincides with the normal passing through the light emission center of the light source unit 4.

  The lens 25 as a whole has a shape obtained when a single plate in contact with the optical axis L is rotated around the optical axis L. The lens 25 includes, for example, a disk-shaped flange portion 26 and a truncated cone-shaped light distribution portion 27. The central axis of the collar part 26 and the central axis of the light distribution part 27 coincide with the optical axis L, respectively. A light distribution unit 27 is disposed at a position close to the light source unit 4. The collar part 26 is arranged at a position farther from the light source part 4 than the light distribution part 27.

  A recess 28 is formed in the light distribution unit 27. The recess 28 is a cylindrical or frustoconical space with the optical axis L as the central axis. The recess 28 opens at the surface 27 a of the light distribution unit 27. The surface 27a is a surface facing the light source unit 4 side. FIG. 12 illustrates 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 recess 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 27 c forms a recess 28. The inner surface 27c may be flat.

  The outer peripheral surface 27 d of the light distribution unit 27 has the smallest diameter near the light source unit 4. The outer peripheral surface 27d increases in diameter 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. The surface 26a and the surface 27a face in opposite directions. In the example shown in this embodiment, each of the surface 26a and the surface 27a is flat. The central axis of the outer peripheral surface 27d coincides with the optical axis L. The outer peripheral surface 27 d is a curve that slightly bulges 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 recess 28 formed in the light distribution unit 27 is surrounded by the outer peripheral surface 27d.

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

  The holder unit 8 holds the light source unit 4 and the lens 25. The holder unit 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 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 condenser lens 9 is not held. That is, the groove 18 is not formed in the first holder 16. Other configurations of the first holder 16 are the same as the configurations disclosed in the first embodiment.

  The second holder 17 in the present embodiment is different from the configuration disclosed in the first embodiment in that the lens 25 is held. The lens 25 is fixed to the second holder 17 in a state where the edge of the flange portion 26 is disposed in the groove 23. Other configurations of the second holder 17 are the same as the configurations disclosed in the first embodiment.

  When the second holder 17 is rotated with respect to the first holder 16, the convex portion 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.

  FIG. 12A shows a state in which the holder portion 8 is most contracted. In the arrangement shown in FIG. 12A, the lens 25 is closest to the light source unit 4. FIG. 12B shows a state in which the holder portion 8 is most extended. In the arrangement shown in FIG. 12B, the lens 25 is arranged at the 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 characteristic of the lens 25 will be described.
The light source unit 4 emits light toward the recess 28. The light emitted from the light source unit 4 travels through the recess 28 and hits the inner surface 27 c and the inner peripheral surface 27 b that form the recess 28.

  In the arrangement shown in FIG. 12A, the path of 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 light radiated from the surface 26a of the collar portion 26 enters the light distribution portion 27 from the inner surface 27c and is not reflected by the outer peripheral surface 27d. The optical path J is a path through which light radiated from the surface 26a of the collar portion 26 travels after entering the light distribution portion 27 from the inner peripheral surface 27b and being reflected by the outer peripheral surface 27d. The light distribution unit 27 is formed so that the optical path H does not intersect the optical axis L in the cross section including the optical axis L. That is, the light traveling on 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, the light traveling on the optical path J gradually approaches the optical axis L after being emitted from the surface 26a. Thereafter, the light traveling on the optical path J travels 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 the optical path K in addition to the optical path H and the optical path J. The optical path K is a path along which the light hitting the first holder 16 travels 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 becomes smaller in the cross section including the optical axis L. Similarly, the angle formed by the optical path J and the optical axis L is reduced. 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 over a wide angle. For this reason, the central luminous intensity is lowered and the 1/2 beam angle is increased. In the arrangement shown in FIG. 12B, the light emitted from the light source unit 4 spreads at a narrow angle. For this reason, compared with the arrangement shown in FIG. 12A, the central luminous intensity is high and the 1/2 beam angle is small.

  By adopting the lens 25 having the above configuration, it is possible to perform light distribution control while maintaining a state where the light efficiency is good. There is no need to increase the size of the lens 25. Moreover, the light-emitting device 6 and the lighting fixture 1 provided with the lens 25 can be provided.

  For 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, each surface may be provided with a diffusion shape for preventing illuminance unevenness or color unevenness. As the diffusion shape, for example, embossing may be performed. Each surface may be faceted or polyhedral. A diffusion sheet may be provided as a measure against illuminance unevenness or color unevenness.

  The structure of the holder part 8 disclosed in each embodiment is an example. The holder portion 8 may have a shape that can be fixed in a stepwise manner as in the configuration described in Japanese Patent Application Laid-Open No. 2012-221769. Further, the first holder 16 may be formed integrally with the main body 5. A convex portion corresponding to the convex portion 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 unit 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 (lens for illumination)
8 Holder 9 Condensing lens (first lens)
9a, 27b Inner peripheral surface 10 Adjustment lens (second lens)
11, 14, 26 collar 11a surface (first surface)
12 condensing part 12a, 14a, 26a, 27a surface 12b, 15b, 27d outer peripheral surface 13 hollow part 15 adjustment part 15a surface (second surface)
16 First holder 17 Second holder 18, 19, 23 Groove 20 Large diameter part 21 Small diameter part 22 Convex part 24 Internal Fresnel part 25 Lens 27 Light distribution part 27c Inner surface 28 Concave part

Claims (10)

A first lens having an outer peripheral surface whose diameter increases as approaching the first surface, a hollow portion surrounded by the outer peripheral surface is formed, and the hollow portion opens at the first surface;
A second lens having a columnar adjustment portion, the adjustment portion being capable of moving the hollow portion along a central axis of the outer peripheral surface;
A lens for lighting.   2. The illumination lens according to claim 1, wherein the adjustment unit has a second surface that faces the opposite side of the first surface disposed in the hollow portion.   The illumination lens according to claim 2, wherein the second surface has a convex shape or a concave shape. The first surface is flat;
The illumination lens according to any one of claims 1 to 3, wherein the adjustment unit moves the hollow portion along a direction orthogonal to the first surface. At least a part of the hollow part has a cylindrical shape,
The illumination lens according to any one of claims 1 to 4, wherein a central axis of the adjustment portion is arranged on the same straight line as a central 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 portion having a cylindrical shape toward the first surface. The first lens includes a disc-shaped collar portion and a truncated cone-shaped condensing portion,
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 that irradiates light to an inner peripheral surface of the first lens that forms the second surface of the adjusting unit and the hollow unit facing the opposite side of the first surface;
A holder portion for holding the illumination lens;
A light emitting device comprising: The holder part is
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, comprising: The light-emitting device according to claim 8 or 9,
The light emitting device is attached, and a main body having a heat radiating portion for radiating heat generated from the light emitting device,
Lighting equipment with

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