WO2017150456A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

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Publication number
WO2017150456A1
WO2017150456A1 PCT/JP2017/007516 JP2017007516W WO2017150456A1 WO 2017150456 A1 WO2017150456 A1 WO 2017150456A1 JP 2017007516 W JP2017007516 W JP 2017007516W WO 2017150456 A1 WO2017150456 A1 WO 2017150456A1
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WO
WIPO (PCT)
Prior art keywords
light
incident
axis direction
emission
axis
Prior art date
Application number
PCT/JP2017/007516
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English (en)
Japanese (ja)
Inventor
旭洋 山田
允裕 山隅
律也 大嶋
振一郎 奥村
Original Assignee
三菱電機株式会社
三菱電機照明株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社, 三菱電機照明株式会社 filed Critical 三菱電機株式会社
Priority to CN201780013578.2A priority Critical patent/CN108779906B/zh
Priority to DE112017001098.5T priority patent/DE112017001098B4/de
Priority to JP2018503298A priority patent/JP6695418B2/ja
Publication of WO2017150456A1 publication Critical patent/WO2017150456A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/08—Refractors for light sources producing an asymmetric light distribution
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses

Definitions

  • the present invention relates to a lighting device using a light emitting diode and an optical element.
  • the illumination device described in Patent Document 1 includes a light source in which a plurality of LEDs are arranged in a line, and a translucent light distribution control member that extends in the LED arrangement direction.
  • the light distribution control member includes a light emitting surface 22, a reflecting surface 24, a reflecting surface 25, an incident surface 26, and an incident surface 27.
  • Light that is emitted from the light source and passes through the incident surface 26 and does not pass through the reflecting surfaces 24 and 25 is emitted from the light emitting surface 22 obliquely rearward and downward.
  • the light emitted from the light source and passing through the incident surface 26 and the reflecting surface 24 is emitted from the light emitting surface 22 in a substantially downward direction.
  • the light emitted from the light source and passing through the incident surface 27 and the reflecting surface 25 is emitted from the light emitting surface 22 in an obliquely rearward downward direction.
  • part of the light emitted from the light source may be reflected by the incident surface 26.
  • a phenomenon in which a part of the light is reflected is called Fresnel reflection.
  • the light reflected by the incident surface 26 is irradiated through the incident surface 27 and the reflecting surface 25. This Fresnel reflected light reduces the uniformity of illumination.
  • the illumination device includes: a light source that emits light; and an optical element that makes the light incident thereon and irradiates the incident light with a deviation from a direction of an object to be irradiated with respect to an optical axis of the light source.
  • the element includes a first incident surface on which the light is incident, a reflecting surface that reflects the light, and an emitting surface that emits light reflected by the reflecting surface, and has reached the first incident surface from the light source.
  • the light includes first light that is transmitted through the first incident surface and second light that is reflected by the first incident surface, and the second light is on the optical path of the second light.
  • a diffusing portion for diffusing light is provided.
  • FIG. 1 is a configuration diagram schematically showing a main configuration of a lighting device 1 according to Embodiment 1.
  • FIG. 4 is an explanatory diagram illustrating an example of an arrangement of the illumination device 11 according to Embodiment 1.
  • FIG. It is a simulation figure for demonstrating the effect of the illuminating device 1 of Embodiment 1.
  • FIG. 6 is a simulation diagram of a ray tracing result of the first embodiment.
  • FIG. FIG. 6 is a configuration diagram schematically showing a main configuration of an illumination device 12 according to a first modification of the first embodiment.
  • FIG. 6 shows a simulation diagram for explaining the effect of the first modification of the first embodiment.
  • FIG. 6 shows a simulation diagram for explaining the effect of the first modification of the first embodiment. It is a block diagram which shows roughly the main structures of the illuminating device 13 of the modification 2 of Embodiment 1.
  • FIG. FIG. 10 is a simulation diagram for explaining an effect of the second modification of the first embodiment.
  • FIG. 10 is a simulation diagram for explaining an effect of the second modification of the first embodiment. It is a block diagram which shows roughly the main structures of Embodiment 2 illuminating device 14.
  • FIG. FIG. 10 is a simulation diagram for explaining the effect of the second embodiment. It is a block diagram which shows roughly the main structures of the illuminating device 15 of the modification 3 of Embodiment 2.
  • FIG. FIG. 10 is a simulation diagram for explaining the effect of the second embodiment.
  • FIG. 10 is a simulation diagram for explaining the effect of the third embodiment. It is a block diagram which shows roughly the main structures of the illuminating device 17 of the modification 4 of Embodiment 3.
  • FIG. 10 is a simulation diagram for explaining the effect of the third embodiment. It is a block diagram which shows roughly the main structures of the illuminating device 18 of the modification 5 of Embodiment 3.
  • FIG. 10 is a ray tracing diagram showing an effect of Modification 5 of Embodiment 3. It is a perspective view which shows an example of the illuminating device 18 of the modification 5 of Embodiment 3.
  • FIG. 6 is a simulation diagram of a ray tracing result of the first embodiment.
  • FIG. 6 is a simulation diagram of a ray tracing result of the first embodiment.
  • FIG. 6 is a simulation diagram of a ray tracing result of the first embodiment.
  • FIG. 10 is a perspective view of an optical element 33a according to Modification 3 of Embodiment 2 viewed from the ⁇ Y axis direction.
  • a region where light reflected by the reflection surface of the optical element passes through the emission surface is defined as a diffusion surface.
  • an embossing process is performed on the exit surface. This makes it easy to reduce local illumination unevenness or illuminance unevenness of the emitted light.
  • illumination unevenness refers to unevenness that is confirmed when the illumination applied to an object (for example, a wall surface) is visually confirmed.
  • the illuminance unevenness indicates unevenness of the illuminance distribution on the irradiated object.
  • the light reflected by the reflecting surface 25 of Patent Document 1 is irradiated from the center of the wall surface toward the floor surface. Therefore, when it is attempted to improve the uniformity of illumination from the upper part of the wall surface to the floor surface, the light reflected by the reflecting surface 25 and the light incident from the incident surface 26 are superimposed on the wall surface. When these two lights are superimposed on the wall surface, illumination unevenness recognized visually on the wall surface is generated due to the influence of the light emitted from the reflecting surface 25. Further, depending on the design of the reflecting surface 25, uneven illuminance occurs, and it has been difficult to realize high-quality uniform illumination over the entire wall surface in a wide range.
  • Patent Document 1 light is irradiated asymmetrically with respect to the optical axis F of the LED 13 (light source).
  • the optical path length varies depending on the light beam of the irradiation light.
  • an irradiation width will change with the distance from an illuminating device to an illumination position.
  • FIG. 1 is a configuration diagram schematically showing a main configuration of a lighting apparatus 1 according to Embodiment 1 of the present invention.
  • Fig.1 (a) is the block diagram which looked at the illuminating device 1 from the + X-axis direction.
  • FIG.1 (b) is the block diagram which looked at the illuminating device 1 from the + Z-axis direction.
  • FIG. 1C is a configuration diagram of the illumination device 1 viewed from the ⁇ Y axis direction.
  • FIG. 1D is a partially enlarged view of the illumination device 1 viewed from the + X axis direction.
  • the illumination device 1 includes a light source 2 and an optical element 3.
  • the light source 2 emits light.
  • the optical element 3 controls the light distribution of the light emitted from the light source 2.
  • the Y-axis direction is the vertical direction of the lighting device 1.
  • the + Y axis direction is the upward direction of the lighting device 1.
  • the ⁇ Y-axis direction is the downward direction of the lighting device 1 when the lighting device 1 is installed on the ceiling.
  • the ⁇ Y axis direction is a direction in which the illumination device 1 emits illumination light.
  • the ⁇ Y-axis direction is the direction of the exit surface of the optical element of the illumination device 1.
  • the + Y-axis direction is the direction of the incident surface of the optical element of the illumination device 1. That is, the + Y axis direction is a direction in which the light source 2 of the illumination device 1 is arranged.
  • the Z-axis direction is the front-rear direction toward the irradiated object 20.
  • the + Z-axis direction is the back side (rear) direction when viewed from the irradiated object 20 side where the illumination device 1 irradiates light. That is, the + Z-axis direction is a direction from the irradiated object 20 toward the illumination device 1.
  • the ⁇ Z-axis direction is the front (front) direction when viewed from the irradiated object 20 side where the illumination device 1 irradiates light. That is, the ⁇ Z-axis direction is a direction from the illumination device 1 toward the irradiated object 20.
  • the X-axis direction is the left-right direction of the lighting device 1 toward the irradiation object 20.
  • the + X-axis direction is the right direction when viewed from the irradiated object 20 side where the illumination device 1 emits light.
  • the ⁇ X axis direction is the left direction when viewed from the irradiated object 20 side where the illumination device 1 irradiates light. That is, the + X-axis direction is the right direction when the illumination device 1 is viewed from the irradiation object 20.
  • the ⁇ X-axis direction is the left direction when the illumination device 1 is viewed from the irradiation object 20.
  • the irradiated object is described as the wall surface 20 as an example.
  • the light source 2 is, for example, a light emitting diode.
  • the light source 2 may be a monochromatic light source, for example.
  • the single color is, for example, red, green, or blue.
  • the light source 2 may be, for example, a light source that generates white using a yellow phosphor for a blue light emitting diode.
  • the light emitting diode of (phi) 14 mm is used as an example.
  • a light emitting diode having a diameter of 3 mm or a light emitting diode having a diameter of 14 mm or more may be used. “ ⁇ ” indicates a diameter.
  • the optical axis C is a straight line that passes through the center of the light emitting surface of the light source 2 and is perpendicular to the light emitting surface.
  • the wall surface 20 is located on the ⁇ Z axis direction side with respect to the lighting device 1. Therefore, the illuminating device 1 irradiates light with a deviation from the optical axis C of the light source 2 in the direction of the irradiated object (wall surface 20).
  • the optical element 3 irradiates the incident light asymmetrically with respect to the optical axis C of the light source 2. As described later, the optical element 3 emits light asymmetrically in the direction of the optical axis C and the exit surface 7 perpendicular intersection as the optical axis C of the center line CL 1.
  • the irradiated object (wall surface 20) is positioned in the direction in which the irradiation light travels asymmetrically. That is, the illuminating device 1 irradiates asymmetrical irradiation light in the direction of the irradiated object (wall surface 20).
  • the optical axis C of the light source 2 is parallel to the Y axis.
  • the optical axis C of the light source 2 is preferably inclined toward the wall surface 20 side. That is, the optical axis C is preferably inclined toward the ⁇ Z axis direction. That is, the optical axis C of the light source 2 is preferably inclined toward the wall surface 20 when the wall surface 20 is parallel to the XY plane.
  • the tilt angle (angle a 1 ) of the optical axis C is 20 degrees [°].
  • the coordinates based on the optical axis C of the light source 2 are set as the XYZ coordinates described above.
  • the coordinates with respect to the irradiated object (wall surface 20) with respect to the tilted illumination device 1 are set as X 1 Y 1 Z 1 coordinates.
  • the X 1 Y 1 Z 1 coordinates are coordinates obtained by rotating the XYZ coordinates about the X axis counterclockwise by an angle a 1 when viewed from the + X axis direction.
  • the optical element 3 includes a second incident surface 4b, a first reflecting surface 6, and a second emitting surface 7b.
  • the optical element 3 can include the first incident surface 4a, the emission surface 7, the second reflection surface 8, or the first emission surface 7a.
  • the emission surface 7 includes a first emission surface 7a and a second emission surface 7b.
  • the reflection surface of the optical element 3 described below is described as a total reflection surface.
  • a reflective film may be formed on the reflective surface.
  • the first incident surface 4a is located on the ⁇ Z axis side with respect to the optical axis C. In other words, the first incident surface 4 a is located on the wall surface 20 side with respect to the optical axis C.
  • the first incident surface 4a is a flat surface.
  • the 1st entrance plane 4a is not restricted to a plane.
  • the first incident surface 4a is inclined in the ⁇ Y-axis direction on the optical axis C side (+ Z axis side) with respect to the ZX plane. That is, the first incident surface 4a is inclined with respect to a plane (ZX plane) perpendicular to the optical axis C.
  • the ⁇ Z-axis end of the first incident surface 4a is located on the + Y-axis side of the + Z-axis end of the first incident surface 4a.
  • Inclination angle relative to a plane perpendicular to the optical axis C (ZX plane) is an angle a 2.
  • the first incident surface 4a is a surface obtained by rotating a plane perpendicular to the optical axis C (ZX plane) around the X axis as viewed from the + X axis direction.
  • Rotation angle is an angle a 2.
  • the end of the first incident surface 4a far from the optical axis C is located closer to the light source 2 in the direction of the optical axis C (Y-axis direction) than the end near the optical axis C.
  • the end far from the optical axis C is the end on the ⁇ Z-axis direction side.
  • the end near the optical axis C is the end on the + Z-axis direction side.
  • the light L 1 incident on the first incident surface 4 a from the light source 2 is refracted in the ⁇ Z-axis direction and reaches the second reflecting surface 8. Or, the light L 2 from the light source 2 is incident on the first incident surface 4a reaches directly to the first light exit surface 7a.
  • Light L 2 having reached directly to the first light exit surface 7a is refracted in the -Z-axis direction. Then, the light L 2 emitted from the first emission surface 7 a is applied to the region on the + Y axis direction side of the wall surface 20.
  • the second reflecting surface 8 is disposed on the ⁇ Z axis side of the first incident surface 4a.
  • the second reflecting surface 8 is connected to the first incident surface 4a. That is, the end on the + Z-axis side of the second reflecting surface 8 is connected to the end on the ⁇ Z-axis side of the first incident surface 4a.
  • the side on the + Z-axis side of the second reflecting surface 8 is inclined in the + Y-axis direction with respect to the ZX plane. That is, the end on the ⁇ Z-axis side of the second reflecting surface 8 is positioned on the ⁇ Y-axis side with respect to the end on the + Z-axis side of the second reflecting surface 8.
  • the inclination angle of the second reflecting surface 8 when the second reflecting surface 8 is approximated to a plane is an angle a 4 with respect to the optical axis C. That is, the second reflecting surface 8 is inclined in the direction of the optical axis C so as to widen the optical path.
  • the end portion of the second reflecting surface 8 near the optical axis C is located closer to the light source 2 in the direction of the optical axis C (Y-axis direction) than the end portion far from the optical axis C.
  • the end far from the optical axis C is the end on the ⁇ Z-axis direction side.
  • the end near the optical axis C is the end on the + Z-axis direction side.
  • the light L 3 reflected by the second reflecting surface 8 is irradiated to the region on the + Y axis direction side of the wall surface 20.
  • the second reflecting surface 8 is, for example, a curved surface.
  • the second reflecting surface 8 is a curved surface with the X axis as the center of curvature. That is, the second reflecting surface 8 has a curvature in the Y-axis direction. And the 2nd reflective surface 8 does not have a curvature in the X-axis direction, for example.
  • the second reflecting surface 8 is, for example, a cylindrical surface.
  • the second reflecting surface 8 may be a concave surface or a convex surface as viewed from the light incident side. However, when the second reflecting surface 8 is concave, the light beam reaches the ⁇ Y axis direction side of the wall surface 20. Further, when the second reflecting surface 8 is a concave surface, the light is collected on the wall surface 20. And illumination unevenness may occur.
  • the diffused light reaches the + Y axis direction side of the wall surface 20 as a convex surface.
  • the second reflecting surface 8 may be a flat surface.
  • the 2nd reflective surface 8 is shown with the convex surface.
  • the reflecting surface will be described as a convex surface or a concave surface.
  • the description will be made as a convex surface or a concave surface for light reaching the reflecting surface.
  • the second reflecting surface 8 has a concave shape in shape.
  • the light beam reaches the second reflecting surface 8 from the inside of the optical element 3.
  • the 2nd reflective surface 8 shown in FIG. 5 is demonstrated as a convex surface.
  • the light L 1 that has reached the second reflecting surface 8 from the first incident surface 4 a is reflected by the second reflecting surface 8.
  • the light L 3 reflected by the second reflecting surface 8 is emitted from the first reflecting surface 7a.
  • the light L 3 reflected by the second reflecting surface 8, by the second reflecting surface 8 is a convex surface when traveling toward the first light exit surface 7a
  • the light spreads in the Y-axis direction. By spreading the light, it becomes easy to suppress local illuminance unevenness when reaching the wall surface 20.
  • the second reflecting surface 8 is formed so as to have a convex shape on the optical axis C side rather than a concave shape or a linear shape on the YZ plane.
  • Rays L 3 reflected by the second reflecting surface 8 reaches the first light exit surface 7a.
  • Reflection of light L 1 at the second reflecting surface 8 is, for example, a total reflection.
  • the light L 2 from the light source 2 is incident on the first incident surface 4a reaches directly to the first light exit surface 7a.
  • Second entrance surface 4b The second incident surface 4b of the optical element 3 is located on the + Z-axis side of the first incident surface 4a.
  • the second incident surface 4b is located on the + Z axis side of the optical axis C. That is, the second incident surface 4 b is located on the opposite side of the wall surface 20 with respect to the optical axis C.
  • the second incident surface 4b is connected to the first incident surface 4a. That is, the end on the ⁇ Z-axis side of the second incident surface 4b is connected to the end on the + Z-axis side of the first incident surface 4a.
  • the connecting portion between the first incident surface 4a and the second incident surface 4b is located on the optical axis C on the YZ plane.
  • the second incident surface 4b is, for example, a flat surface.
  • the second incident surface 4b is tilted in the ⁇ Y-axis direction on the + Z-axis side with respect to the ZX plane. That is, the second incident surface 4b is inclined with respect to a plane (ZX plane) perpendicular to the optical axis C.
  • the ⁇ Z-axis end of the second incident surface 4b is located on the + Y-axis side of the + Z-axis end of the second incident surface 4b.
  • the inclination angle (angle a 3 ) of the second incident surface 4 b is larger than the inclination angle (angle a 2 ) of the first incident surface 4 a. .
  • the second incident surface 4b is a surface obtained by rotating a plane (ZX plane) perpendicular to the optical axis C around the X axis in a clockwise direction when viewed from the + X axis direction.
  • Rotation angle is the angle a 3.
  • the end near the optical axis C of the second incident surface 4b is located closer to the light source 2 in the direction of the optical axis C (Y-axis direction) than the end far from the optical axis C.
  • the end close to the optical axis C is the end on the ⁇ Z-axis direction side.
  • the end far from the optical axis C is the end on the + Z-axis direction side.
  • the boundary line between the first incident surface 4a and the second incident surface 4b has a linear shape.
  • the boundary line between the first incident surface 4a and the second incident surface 4b is parallel to the X axis.
  • Light L 4 incident from the second incident surface 4b reaches the first light exit surface 7a. Further, the light L 5 incident from the second incident surface 4b reaches the second exit surface 7b. That is, part of the light (light L 4 ) incident from the second incident surface 4b reaches the first emission surface 7a. Further, a part of the light (light L 5 ) incident from the second incident surface 4b reaches the second emission surface 7b.
  • the light L 4 incident from the second incident surface 4 b is refracted and emitted from the first emitting surface 7 a in the ⁇ Y axis direction.
  • the light L 5 incident from the second incident surface 4b is emitted from the second emission surface 7b in the -Y axis direction.
  • the light is refracted and scattered. Refractive scattering is that light is refracted and scattered.
  • the first incident surface 4a and the second incident surface 4b of the optical element 3 are shown as flat surfaces, but may be curved surfaces. Further, the first incident surface 4a and the second incident surface 4b may be a flat surface or a curved surface. That is, the first incident surface 4a and the second incident surface 4b may be the same surface.
  • the tilt angle tilt angle with respect to the ZX plane of the first incident surface 4a (angle a 2) is for the ZX plane of the second incident surface 4b (angle a 3 Is preferably smaller than. That is, the first incident surface 4a may be parallel to the ZX plane, for example.
  • the light L 4 emitted from the first emission surface 7 a is applied to the region on the + Y axis direction side of the wall surface 20. Further, the light L 5 emitted from the first emission surface 7 b is applied to the region on the ⁇ Y axis direction side of the wall surface 20.
  • Light (for example, light L 4 ) incident from the end of the incident surface 4 b on the ⁇ Z axis direction side reaches the region on the + Y axis direction side of the wall surface 20.
  • the light (for example, light L 5 ) incident from the end on the + Z-axis direction side of the incident surface 4 b reaches the ⁇ Y-axis direction side region of the wall surface 20.
  • the third incident surface 5 of the optical element 3 is located on the + Z-axis side of the second incident surface 4b.
  • the third incident surface 5 is disposed between the second incident surface 4 b and the first reflecting surface 6.
  • the third incident surface 5 is connected to the second incident surface 4b.
  • the + Z-axis end of the second incident surface 4b is connected to the ⁇ Y-axis end of the third incident surface 5.
  • the end of the third incident surface 5 far from the light source 2 in the direction of the optical axis C is disposed at the position of the end far from the optical axis C of the second incident surface 4b.
  • the third incident surface 5 is a flat surface.
  • the third incident surface 5 is not limited to a flat surface.
  • the third incident surface 5 has a + Y-axis side inclined to the + Z-axis side with respect to the XY plane. That is, the end on the + Y-axis side of the third entrance surface 5 is located on the + Z-axis side with respect to the end on the ⁇ Y-axis side.
  • the third incident surface 5 is a surface obtained by rotating a surface parallel to the XY plane around the X axis in a clockwise direction when viewed from the + X axis direction. Rotation angle is an angle a 5.
  • the light L 7 emitted from the light source 2 reaches the third incident surface 5 directly.
  • the light L 6 that is Fresnel-reflected by the second incident surface 4 b among the light emitted from the light source 2 also reaches the third incident surface 5.
  • the light L 6 emitted from the light source 2 and reflected by the second incident surface 4 b reaches the third incident surface 5.
  • the reflection at the second incident surface 4b is, for example, Fresnel reflection.
  • Lights L 6 and L 7 incident from the third incident surface 5 reach the first reflecting surface 6.
  • the light L 6 reflected by the first reflecting surface 6 is applied to the wall surface 20 as illumination light.
  • the light L 7 reflected by the first reflecting surface 6 is also applied to the wall surface 20 as illumination light.
  • the illumination light is light that illuminates the irradiated object.
  • Illumination light is light that is irradiated onto an object to be irradiated.
  • the first reflecting surface 6 of the optical element 3 is disposed on the + Z-axis direction side of the third incident surface 5.
  • the end on the ⁇ Z-axis direction side of the first reflecting surface 6 is connected to the end on the + Y-axis direction side of the third incident surface 5.
  • the end portion of the third incident surface 5 close to the light source 2 in the direction of the optical axis C is arranged at the position of the end portion close to the optical axis C of the first reflecting surface 6.
  • the first reflecting surface 6 of the optical element 3 is a surface whose side in the ⁇ Y axis direction is inclined in the + Z axis direction with respect to the XY plane. That is, the end of the first reflecting surface 6 on the + Y axis direction side is located closer to the optical axis C than the end of the first reflecting surface 6 on the ⁇ Y axis direction side. Alternatively, the end of the first reflecting surface 6 on the ⁇ Z-axis direction side is located on the + Y-axis direction side of the end of the first reflecting surface 6 on the + Z-axis direction side. That is, the first reflecting surface 6 is inclined so as to widen the optical path in the direction of the optical axis C.
  • the first reflecting surface 6 is a surface obtained by rotating a surface parallel to the XY plane around the X axis counterclockwise when viewed from the + X axis direction. Rotation angle is the angle a 6.
  • the first reflecting surface 6 is inclined with respect to a plane (ZX plane) perpendicular to the optical axis C.
  • the end portion of the first reflecting surface 6 near the optical axis C is located closer to the light source 2 in the direction of the optical axis C than the end portion far from the optical axis C.
  • the first reflecting surface 6 may be a flat surface. However, the curved surface of the first reflecting surface 6 can more efficiently irradiate the wall surface 20 with light. However, in order to reduce illuminance unevenness, the first reflecting surface 6 is preferably a flat surface.
  • the first reflecting surface 6 has a curvature in the Y-axis direction. And the 1st reflective surface 6 does not have a curvature in a X-axis direction. That is, the first reflecting surface 6 is a cylindrical surface. Further, the first reflecting surface 6 can have a curvature in the X-axis direction. That is, the first reflecting surface 6 is a spherical surface or a toroidal surface.
  • the first reflecting surface 6 is a concave surface when viewed from the direction in which the light beam enters.
  • the curved surface shape of the first reflecting surface 6 is a concave shape on the optical axis C side.
  • the first reflection surface 6 is, for example, a total reflection surface. However, a reflective film may be formed on the first reflective surface 6.
  • the light reflected by the first reflecting surface 6 reaches the second emitting surface 7b. Most of the light reflected by the first reflecting surface 6 is refracted and scattered in the ⁇ Y-axis direction from the second emitting surface 7b.
  • the side surfaces 9 are formed on the + X axis direction side and the ⁇ X axis direction side of the optical element 3.
  • the end of the side surface 9 on the + Y-axis direction side is connected to the end of the first incident surface 4a, the second incident surface 4b, and the third incident surface 5 on the X-axis direction side.
  • the end of the side surface 9 on the ⁇ Z-axis direction side is connected to the end of the second reflecting surface 8 on the X-axis direction side.
  • the end portion of the side surface 9 on the + Z-axis direction side is connected to the end portion of the first reflecting surface 6 on the X-axis direction side.
  • the side surface 9 of the optical element 3 has, for example, a cylindrical side surface shape around the optical axis C.
  • the side surface 9 has, for example, a cylindrical side surface shape centered on the optical axis C.
  • the distance between the end of the side surface 9 in the + Y-axis direction and the optical axis C is narrower than the distance between the end of the side surface 9 in the ⁇ Y-axis direction and the optical axis C. That is, the end portion of the side surface 9 on the + Y axis direction side is located closer to the optical axis C side than the end portion of the side surface 9 on the ⁇ Y axis direction side.
  • the side surface 9 has, for example, a truncated cone shape with the optical axis C as the center.
  • the side surface 9 has a curved surface on the optical axis C side from the + Y axis toward the ⁇ Y axis. That is, the side surface 9 has a curved surface shape in the Y-axis direction.
  • the curved shape of the side surface 9 is a convex shape in the direction of the optical axis C. That is, the curved surface shape of the side surface 9 is a convex surface when viewed from the direction in which the light beam enters.
  • the side surface 9 has a curvature in the Z-axis direction, for example.
  • the side surface 9 may not have a curvature in the Y-axis direction, for example. That is, the side surface 9 is a cylindrical surface.
  • the side surface 9 may have a curvature in the Z-axis direction and the Y-axis direction. That is, the side surface 9 is a toroidal surface.
  • the light emitted from the light source 2 enters the optical element 3 from the first incident surface 4 a, the second incident surface 4 b, or the third incident surface 5. A part of the light incident on the optical element 3 travels toward the side surface 9. A part of the light incident on the optical element 3 reaches the side surface 9.
  • the light that has reached the side surface 9 is reflected by the side surface 9.
  • the reflection at the side surface 9 is, for example, total reflection.
  • the light reflected by the side surface 9 becomes light that spreads in the ⁇ Y-axis direction due to the curved surface of the side surface 9.
  • the light reflected by the side surface 9 has spread, it reaches
  • the shape obtained by cutting the side surface 9 with a plane perpendicular to the optical axis C is an arc shape. For this reason, when viewed on the ZX plane, the light reflected by the side surface 9 once collects, but then spreads and proceeds.
  • the side surface 9 has a curvature in the Y-axis direction. For this reason, part of the light reflected by the side surface 9 and traveling in the ⁇ Y-axis direction is condensed once and then spreads and travels.
  • the light reflected by the side surface 9 is scattered by a surface including a plurality of planes.
  • the side surface 9 is not limited to a cylindrical side surface shape. Therefore, the optical element 3 can include a reflection surface that reflects the light that has reached the side surface 9 in the direction of the wall surface 20.
  • the light reflected by the side surface 9 reaches the first emission surface 7a.
  • the light that reaches the first emission surface 7a is refracted in the ⁇ Y-axis direction on the first emission surface 7a.
  • the light that has reached the first emission surface 7a is emitted from the first emission surface 7a.
  • the light that reaches the first emission surface 7a is emitted from the first emission surface 7a toward the -Y-axis direction.
  • the light reflected by the side surface 9 reaches the second emission surface 7b.
  • the light that has reached the second emission surface 7b is refracted in the ⁇ Y-axis direction on the second emission surface 7b.
  • the light that has reached the second emission surface 7b is emitted from the second emission surface 7b toward the -Y-axis direction.
  • the light that reaches the second emission surface 7b is scattered on the second emission surface 7b.
  • the side surface 9 may have any shape as long as the light reaching the wall surface 20 does not cause local illuminance unevenness.
  • the side surface 9 may be a diffusion surface.
  • the side surface 9 may have a surface shape including a plurality of planes.
  • the side surface 9 may be a curved surface having a convex shape on the side opposite to the optical axis C.
  • the first emission surface 7a is also a diffusion surface.
  • the “surface shape including a plurality of planes” is, for example, a stripe shape (strip shape) as shown in FIG. That is, the side surface 9 has, for example, a shape in which strip-shaped surfaces that are long in the Y-axis direction are arranged in the Z-axis direction.
  • the side surface 9 may be a border-shaped surface shape.
  • the “border shape” is a shape in which strip-shaped surfaces long in the Z-axis direction are arranged in the Y-axis direction.
  • the side surface 9 may have a surface shape having a plurality of quadrangles as components. That is, the side surface 9 can take many shapes as long as it has an effect of scattering light.
  • the plurality of planes can be a plurality of curved surfaces.
  • the exit surface 7 is a surface on the ⁇ Y axis direction side of the optical element 3.
  • the emission surface 7 includes two regions.
  • the emission surface 7 includes a first emission surface 7a and a second emission surface 7b.
  • the boundary between the first emission surface 7a and the second emission surface 7b is, for example, a linear shape parallel to the X axis.
  • the first emission surface 7a is, for example, an optical polishing surface.
  • the light that reaches the first emission surface 7a is refracted in the ⁇ Y-axis direction by the first emission surface 7a.
  • the light refracted by the first emission surface 7a is emitted from the first emission surface 7a in the ⁇ Y axis direction.
  • the second emission surface 7b is, for example, a diffusion surface.
  • the diffusion surface of the second exit surface 7b has, for example, scattering characteristics with a Gauss angle of 2 °.
  • the first emission surface 7a may be a diffusion surface. This reduces the light utilization efficiency. However, the illumination distribution and the illumination unevenness are further reduced. And the uniformity of illumination improves. For this reason, in consideration of light utilization efficiency, it is preferable that only the second emission surface 7b is a diffusion surface.
  • a device such as a fine prism structure on the diffusion surface may be used.
  • FIG. 2 is an explanatory diagram showing an example of a state in which the lighting device 1 according to the first embodiment is installed.
  • FIG. 2 shows a case where the lighting device 1 illuminates the wall surface 20.
  • the wall surface 20 is disposed at a position offset from the optical axis C of the light source 2.
  • the wall surface 20 is arranged so as to be offset toward the ⁇ Z axis direction side with respect to the optical axis C of the light source 2.
  • Such an illuminating device 1 is also called a wall washer downlight.
  • Such an illuminating device 1 irradiates light toward the optical axis C of the light source 2 in the direction of the irradiated object (20).
  • the lighting device 11 includes a light source 2, an optical element 3, and the like. However, the detailed structure of the illumination device 11 is omitted in FIGS.
  • the lighting device 11 is installed to be inclined at an angle a 1 with respect to the wall surface 20. That is, the optical axis C of the illuminating device 11 is inclined toward the wall surface 20 by an angle a 1 from a state parallel to the wall surface 20.
  • the lighting device 11 shown in FIG. 2 is, for example, the lighting device 1 shown in FIG. Moreover, the illuminating device 11 shown in FIG. 2 is the illuminating device 12, the illuminating device 14, the illuminating device 15, the illuminating device 16, the illuminating device 17, or the illuminating device 18 mentioned later, for example.
  • FIG. 2B shows the positional relationship between the lighting device 11 and the wall surface 20.
  • the width H of the wall surface is 4800 mm.
  • the height V of the wall surface is 2700 mm in length.
  • the distance D between the lighting device 11 and the wall surface 20 is 900 mm.
  • FIG. 3 is a simulation diagram for explaining the effect of the lighting apparatus 1 according to the first embodiment.
  • the arrangement of the lighting device 1 is the arrangement shown in FIG.
  • FIG. 3A shows the illuminance distribution on the wall surface 20 of the light emitted from the lighting device 1.
  • FIG. 3B shows the illuminance distribution on the wall surface 20 when the second exit surface 7b is an optical polishing surface. That is, in FIG. 3B, the second emission surface 7b is not a diffusion surface.
  • FIG. 3A and FIG. 3B are illuminance distributions by light emitted from the first emission surface 7a and the second emission surface 7b.
  • the second emission surface 7b in FIG. 3A is a diffusion surface.
  • the second exit surface 7b in FIG. 3B is an optical polishing surface.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts and displayed by contour lines.
  • the illuminance increases as going to the center of the contour line. In other words, the center of the contour line is brighter than the periphery.
  • FIGS. 3A and 3B when the region 30a and the region 30b are compared, some uneven illuminance is confirmed, but it can be confirmed that the region 30a has higher uniformity of illuminance distribution.
  • the diffusion surface of the second emission surface 7b is assumed to be equivalent to a Gauss angle of 2 °.
  • the optical polishing surface is also called an optical surface.
  • An optical polishing surface is a surface that can be controlled in the design of light.
  • the optically polished surface is not a diffusion surface or a blackened surface. Note that Fresnel reflection occurs on the optically polished surface when the non-reflective coating is not applied.
  • a lens used for a lighting device is formed of a resin such as PMMA. And the non-reflective coating is not given.
  • FIG. 4 is a simulation diagram for explaining the effect of the lighting apparatus 1 according to the first embodiment.
  • FIG. 4A shows the illuminance distribution on the wall surface 20 of the light emitted from the first emission surface 7a.
  • FIG. 4B shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 7b as a diffusion surface.
  • FIG. 4C shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 7b which is an optical polishing surface. That is, in FIG. 4C, the second emission surface 7b is not a diffusion surface.
  • FIG. 4A shows an illuminance distribution by light emitted from the first emission surface 7a.
  • FIG. 4B shows an illuminance distribution by light emitted from the second emission surface 7b (diffusion surface).
  • FIG. 4C shows an illuminance distribution by light emitted from the second emission surface 7b (optical polishing surface).
  • the horizontal axis indicates the X-axis direction
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines and displayed.
  • the illuminance increases as going to the center of the contour line.
  • the light incident on the first incident surface 4a and the second incident surface 4b mainly reaches the first emission surface 7a.
  • the light that reaches the first emission surface 7a is refracted and emitted in the ⁇ Y-axis direction.
  • the light emitted from the first emission surface 7 a is applied to the upper side of the wall surface 20.
  • the upper side of the wall surface 20 is the + Y axis direction side of the wall surface 20.
  • the light emitted from the first emission surface 7a has a substantially uniform illuminance distribution.
  • the light emitted from the second emission surface 7 b is applied to the lower side of the wall surface 20.
  • the lower side of the wall surface 20 is the floor surface side ( ⁇ Y 1 axial direction side) of the wall surface 20.
  • the light emitted from the second emission surface 7b has a substantially uniform illuminance distribution except in the region 40b.
  • the light that has reached the region 40b on the wall surface 20 is Fresnel-reflected by the second incident surface 4b, is incident from the third incident surface 5, is reflected by the first reflecting surface 6, and the second The light emitted from the emission surface 7b is included.
  • the light that reaches the region 40b is diffused when it is emitted from the second emission surface 7b.
  • the second exit surface 7b is a diffusing surface, the density of the contour lines is low. That is, the interval between the contour lines is wide.
  • the contour lines at the position 40c are dense when the second emission surface 7b is an optical polishing surface. That is, the interval between the contour lines is narrow. As a result, a portion where the illuminance suddenly decreases occurs. For this reason, when the light emitted from the second emission surface 7 b and the light emitted from the first emission surface 7 a are superimposed on the wall surface 20, illuminance unevenness easily occurs. And it is visually recognized as illumination unevenness.
  • the illuminance unevenness shown here indicates local illuminance unevenness that occurs in a narrow region. It should be noted that the illumination unevenness shown here is unlikely to appear as the illuminance distribution, and the difference as the illuminance distribution is shown small.
  • the Gauss angle of the diffusion surface of the second exit surface 7b is increased, the effect of reducing illuminance unevenness can be further obtained. That is, if the degree of light scattering on the second exit surface 7b is increased, an effect of reducing unevenness in illuminance can be further obtained.
  • the Gauss angle is set to 2 °.
  • the second exit surface 7b is preferably a region through which light reflected by the second entrance surface 4b and reflected by the first reflection surface 6 passes.
  • the second exit surface 7b is preferably a region on the ⁇ Z-axis direction side of the ⁇ Y-axis direction side end of the third entrance surface 5 relative to the Z-axis direction position.
  • the illumination unevenness can be reduced and the illuminance can be reduced. Unevenness can be reduced. This is because, as shown in FIG. 5, some of the light rays reflected by the second incident surface 4b and reflected by the first reflecting surface 6 are on the ⁇ Y axis direction side of the third incident surface 5. This is because there is also a light beam that reaches the output surface 7 on the + Z-axis side of the end portion.
  • FIG. 5 is a simulation diagram of the ray tracing result of the first embodiment.
  • the light 400 reflected by the Fresnel at the second incident surface 4b is incident on the third incident surface 5, reflected by the first reflecting surface 6, and emitted from the second emitting surface 7b.
  • the second emission surface 7b is simulated as an optical polishing surface.
  • the light 401 incident from the third incident surface 5 is totally reflected by the first reflecting surface 6 and is emitted from the second emitting surface 7b.
  • the reflection on the first reflecting surface 6 will be described as total reflection as an example.
  • Light 400 shown in FIG. 5 corresponds to the light L 6 shown in FIG. 1 (d). Further, the light 401, corresponding to the light L 7 shown in FIG. 1 (d).
  • the light 400 reflected by Fresnel at the second incident surface 4b is more on the ⁇ Z-axis direction side on the second emission surface 7b than the light 401 directly incident on the third incident surface 5 from the light source 2. It is emitted from the area. That is, the emission position of the light 400 is located on the ⁇ Z axis direction side of the emission position of the light 401 on the second emission surface 7 b.
  • the light 400 is light that is Fresnel reflected by the second incident surface 4b.
  • the light 401 is light that is directly incident on the third incident surface 5 from the light source 2.
  • ⁇ Modification 1> In first and second modifications, and changes the inclination angle of a 6 with respect to the optical axis C of the first reflecting surface 6.
  • the inclination angle a 6 In the optical element 31 of the first modification, the inclination angle a 6 is larger than that of the optical element 3.
  • the inclination angle a 6 In the optical element 32 of the second modification, the inclination angle a 6 is smaller than that of the optical element 3.
  • FIG. 6 is a configuration diagram schematically showing a main configuration of the illumination device 12 according to the first modification of the first embodiment. Except for the first reflecting surface 61, the configuration is the same as that of the lighting device 1 of the first embodiment, and thus the description thereof is omitted.
  • the end portion on the ⁇ Y-axis direction side of the first reflecting surface 61 is moved in the + Z-axis direction as compared with the first reflecting surface 6 of the first embodiment. This makes it possible to move the light emitted from the second emission surface 7b in the ⁇ Y-axis direction of the wall surface 20 as compared with the first embodiment. In other words, longer towards the length B 2 shown in FIGS. 6 (a) than the length B 1 shown in FIG. 1 (a).
  • the lengths B 1 and B 2 are the lengths in the Z-axis direction from the optical axis C to the end of the first reflecting surfaces 6 and 61 on the ⁇ Y-axis direction side.
  • FIG. 7 is a simulation diagram for explaining the effect of the first modification of the first embodiment.
  • the arrangement of the illumination device 12 is the arrangement shown in FIG.
  • FIG. 7A shows the illuminance distribution on the wall surface 20 of the light emitted from the lighting device 12.
  • FIG. 7B shows the illuminance distribution on the wall surface 20 when the second exit surface 7b is an optical polishing surface. That is, in FIG. 7B, the second emission surface 7b is not a diffusion surface.
  • FIG. 7A and FIG. 7B are illuminance distributions by light emitted from the first emission surface 7a and the second emission surface 7b.
  • the second emission surface 7b in FIG. 7A is a diffusion surface.
  • the second emission surface 7b in FIG. 7B is an optical polishing surface.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • the illuminance distribution is generally uniform. That is, the uneven illuminance in the region 30a shown in FIG. 3A is reduced.
  • FIG. 7B illuminance unevenness is confirmed at the location shown in the region 60b. Thereby, even when the position where the light emitted from the second emission surface 7b arrives on the wall surface 20 is moved in the ⁇ Y-axis direction as compared with the first embodiment, the effect of improving the illuminance unevenness is increased. Is confirmed.
  • FIG. 8 is a simulation diagram for explaining the effect of the first modification of the first embodiment.
  • FIG. 8A shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 7b.
  • FIG. 8B shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 7b when the second emission surface 7b is an optical polishing surface. That is, in FIG. 8B, the second emission surface 7b is not a diffusion surface.
  • FIG. 8A and FIG. 8B are illuminance distributions by light emitted from the second emission surface 7b.
  • the second emission surface 7b in FIG. 8A is a diffusion surface.
  • the second emission surface 7b in FIG. 8B is an optical polishing surface.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • Fig. 8 (a) confirms that there is a position of maximum illuminance in the Y-axis direction slightly less than 900 mm in the Y-direction position. Comparing FIG. 8A and FIG. 8B, the density of the contour lines is higher at the position 70b than at the position 70a. For this reason, it is considered that the position 70b is more affected by uneven illuminance and uneven illumination than the position 70a.
  • the height of 900 mm is 1/3 of the height V of the wall surface 20.
  • the illuminance unevenness near the middle between 900 mm and 1350 mm in the Y-axis direction is large. It is confirmed that the density of the contour lines at the position 70b2 particularly affects the illuminance unevenness. As shown in FIG. 8B, the position 70b2 is near the middle between 900 mm and 1350 mm in the Y-axis direction. 7B, the region 60b is near the middle between 900 mm and 1350 mm in the Y-axis direction. The region 60b is a place where uneven illuminance is confirmed.
  • the uneven illuminance due to the light emitted from the second emission surface 7b shown in FIG. 8B is considered to be the cause of the uneven illuminance shown in FIG. 7B.
  • the second emission surface 7b shown in FIG. 8B is an optical polishing surface.
  • the effect of using the second emission surface 7b as the diffusion surface can be confirmed.
  • the rate at which the light beam emitted from the light source 2 reaches the vicinity of 900 mm of the wall surface 20 after being reflected by the first reflecting surface 61 is increased. Then, the brightness of the wall surface 20 near 900 mm is increased.
  • the curved surface shape of the first reflecting surface 61 and the position of the end portion of the first reflecting surface 61 on the ⁇ Y axis direction side on the Z axis direction side are optimized.
  • the first reflecting surface 6 be a flat surface.
  • the first reflecting surface 6 includes a curved surface.
  • a diffused light beam emitted from one point on the light emitting surface of the light source 2 becomes parallel light when emitted from the emitting surface 7.
  • One point on the light emitting surface is, for example, the center of the light emitting surface or the end of the light emitting surface.
  • the exit surface 7 is an optical polishing surface. Thereby, the spread of the light emitted from the emission surface 7 can be reduced. And it becomes possible to make light reach a wall surface efficiently.
  • FIG. 9 is a configuration diagram schematically illustrating a main configuration of the illumination device 13 according to the second modification of the first embodiment. Except for the first reflection surface 62 and the second emission surface 71b, the configuration is the same as that of the illumination device 1 of the first embodiment, and thus the description thereof is omitted.
  • the end portion on the ⁇ Y-axis direction side of the first reflecting surface 62 is moved in the ⁇ Z-axis direction as compared with the first embodiment.
  • the length B 3 shown in FIG. 9 is shorter than the length B 1 shown in FIG. This makes it possible to move the light emitted from the second emission surface 7b in the + Y-axis direction of the wall surface 20 as compared with the first embodiment.
  • the second exit surface 71b is a diffusion surface corresponding to a Gauss angle of 4 °.
  • the Gauss angle is 2 °, uneven illumination remains, so the Gauss angle is set to 4 °.
  • the design of the first reflecting surface 62 necessitates changing the degree of roughness of the diffusing surface.
  • FIG. 10 is a simulation diagram for explaining the effect of the second modification of the first embodiment.
  • the illumination device 13 is arranged as shown in FIG.
  • FIG. 10A shows the illuminance distribution on the wall surface 20 of the light emitted from the lighting device 13.
  • FIG. 10B shows the illuminance distribution on the wall surface 20 when the second emission surface 71b is an optical polishing surface. That is, in FIG. 10B, the second emission surface 71b is not a diffusion surface.
  • FIG. 10C shows an illuminance distribution on the wall surface 20 when the second exit surface 71b is an optical polishing surface and the third entrance surface 5 is a diffusion surface.
  • the third incident surface 5 is a diffusing surface corresponding to a Gauss angle of 4 °.
  • FIG. 10A, FIG. 10B, FIG. 10C, and FIG. 10D are illuminance distributions by light emitted from the first emission surface 7a and the second emission surface 71b.
  • the second emission surface 7b in FIG. 10A is a diffusion surface.
  • the second emission surface 7b in FIG. 10B is an optical polishing surface.
  • the second exit surface 7b is an optical polishing surface
  • the third entrance surface 5 is a diffusion surface.
  • the first reflecting surface 62 has a surface shape formed by three planes. That is, the first reflecting surface 62 has a surface shape including a plurality of planes.
  • the second exit surface 7b and the third entrance surface 5 are optically polished surfaces.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines and displayed.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • FIG. 10 (a) it can be confirmed that the illuminance distribution is generally uniform. From FIG. 10B, large illuminance unevenness is confirmed at the location shown in the region 90b. This confirms that the influence on the illuminance unevenness of the second emission surface 71b is large. That is, when the second emission surface 71b is changed from the diffusion surface (FIG. 10A) to the optical polishing surface (FIG. 10B), uneven illuminance occurs in the region 90b.
  • the illuminance is obtained by changing the Gauss angle from 2 degrees to 4 degrees. The effect of improving unevenness is confirmed.
  • the light emitted from the second emission surface 71b has a high illuminance in the vicinity of 900 mm of the wall surface 20 (which is 1/3 the height V of the wall surface 20). This is because the space between the lighting device 13 and the wall surface 20 becomes narrower as the + Y-axis direction side of the wall surface 20 is irradiated.
  • the light reaching the wall surface 20 reaches the + Y-axis direction as compared with the first embodiment. For this reason, it is thought that the influence of the 2nd output surface 7b became large.
  • the illuminance is inversely proportional to the square of the distance. For this reason, illumination intensity falls, so that irradiation distance is long. Also, the shorter the irradiation distance, the higher the illuminance.
  • the illuminance distribution is generally uniform. From this, it can be confirmed that by using the third incident surface 5 as a diffusing surface, the same effect as that obtained when the second emitting surface 71b is used as a diffusing surface can be obtained. That is, the illuminating device 13 uses a surface (third incident surface 5) farther from the wall surface 20 than the illuminating device 1 as a diffusing surface. Therefore, the effect of reducing the illuminance unevenness on the wall surface 20 can be obtained by using the third incident surface 5 as a diffusing surface.
  • the illuminating device 13 makes the inclination angle (angle a 6 ) of the first reflecting surface 62 with respect to the optical axis C smaller than that of the illuminating device 1. Therefore, the illumination device 13 illuminates a region closer to the wall surface 20 than the illumination device 1.
  • the light use efficiency of the lighting device 13 is generally the same light use efficiency as that of the lighting device 1.
  • the light beam (light L 6 ) reflected by the second incident surface 4 b is incident on the third incident surface 5. Therefore, it is considered that if the third incident surface 5 is a diffusing surface, the illuminance unevenness generated on the wall surface 20 is reduced. For this reason, the 3rd entrance surface 5 is made into a diffusion surface instead of the 2nd outgoing surface 7b.
  • the same effect as that obtained when the second emission surface 7b is a diffusion surface can be obtained.
  • the case where the second emission surface 7b is a diffusion surface and the case where the third incident surface 5 is a diffusion surface are compared, there is little difference in light utilization efficiency.
  • the optical path from the third incident surface 5 to the wall surface 20 is longer than the optical path from the second emission surface 7 b to the wall surface 20. For this reason, the use efficiency of light decreases when the third incident surface 5 is a diffusion surface.
  • the utilization efficiency of light reaching the wall surface is lower by about 2% than the lighting device 1. However, this decrease of about 2% is considered to have little difference.
  • FIG. 11 is a simulation diagram for explaining the effect of the second modification of the first embodiment.
  • FIG. 11A shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 71b.
  • FIG. 11B shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 71b when the second emission surface 71b is an optical polishing surface. That is, in FIG. 11B, the second emission surface 71b is not a diffusion surface.
  • FIG. 11A, FIG. 11B, and FIG. 11C are illuminance distributions by light emitted from the second emission surface 71b.
  • the second emission surface 7b in FIG. 11A is a diffusion surface.
  • the second emission surface 7b in FIG. 11B is an optical polishing surface.
  • the first reflecting surface 62 has a surface shape formed by three planes.
  • the second exit surface 7b and the third entrance surface 5 are optically polished surfaces.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • Line 100a, line 100b and line 100c indicate the maximum illuminance position in the Y-axis direction of the illuminance distribution.
  • FIG. 11 (a) is compared with FIG. 11 (b). From line 100a and line 100b, the position between 900 mm and 1350 mm in the Y direction is the maximum illuminance in both FIGS. 11 (a) and 11 (b).
  • the position of strong illuminance is located between 900 mm and 1350 mm. And it is thought that the intensity
  • the wall surface 20 can be illuminated with high efficiency and uniformity.
  • the first reflecting surface 62 is preferably a curved surface close to a flat surface.
  • the first reflecting surface 62 may be a flat surface.
  • the first embodiment is a curved surface that is relatively close to a flat surface.
  • the first reflecting surface 62 has a surface shape formed by three planes.
  • the length of the first reflecting surface 62 in the Y-axis direction is divided into three to form a concave shape with three planes.
  • the degree of light collection reaching the wall surface 20 is reduced. And the same effect as the case where the 2nd output surface 71b or the 3rd entrance surface 5 is made into a diffusion surface is acquired.
  • the first reflecting surface 62 is formed in a surface shape including a plurality of planes, the first reflecting surface 62 has a shape similar to the curved surface shape.
  • the light use efficiency of the first reflecting surface 62 having a planar shape including a plurality of planes is approximately the same as the light use efficiency when the second exit surface 71b or the third entrance surface 5 is a diffusing surface. It becomes.
  • the first reflecting surface 62 has a surface shape including a plurality of planes.
  • the surface shape including the plurality of planes is formed by arranging three strip-shaped planes in the Y-axis direction. This strip shape has a rectangular shape that is long in the X-axis direction.
  • the third entrance surface 5, the first exit surface 7a, and the second exit surface 71b are optically polished surfaces.
  • FIG. 10 (d) it can be confirmed that the illuminance unevenness is reduced as in FIGS. 10 (a) and 10 (c). Further, in FIG. 11C, the effect of Fresnel reflection remains a little as compared to FIG. The influence of Fresnel reflection appears between 1350 mm and 1800 mm in the Y-axis direction.
  • the 1st reflective surface 62 was formed in three planes.
  • the first reflecting surface 62 may be formed by a plurality of planes other than three.
  • the number of planes forming a surface shape including a plurality of planes is small.
  • the 1st reflective surface 62 is the surface shape formed by the at least 2 or more surface so that the light which is reflected by the 2nd incident surface 4b and reaches
  • the light beam of the diffused light emitted from one point on the light emitting surface of the light source becomes parallel light when emitted from the emitting surface 7.
  • diffused light of about 1 to 2 degrees is preferable to parallel light.
  • the second emission surface 7b is a diffusion surface.
  • the light that affects the illuminance unevenness and the illumination unevenness is light that passes through the third incident surface 5. Therefore, the same effect can be obtained by using the third incident surface 5 as a diffusing surface and the second emitting surface 7b as an optical polishing surface.
  • the light affecting the illuminance unevenness and the illumination unevenness is light reflected by the first reflecting surface 6. Therefore, by making the first reflecting surface 6 into a surface shape including a plurality of planes, the same effect can be obtained even if the second emission surface 7b is an optical polishing surface.
  • the first reflecting surface 6 is formed, for example, by arranging a plurality of strip-shaped planes that are long in the X-axis direction in the Y-axis direction.
  • the third incident surface 5 is made a diffusing surface by graining or the like.
  • the second emission surface 7b is an optical polishing surface. As a result, it is possible to suppress scattering of light incident from the second incident surface 4b and emitted from the second emission surface 7b. For this reason, the fall of the utilization efficiency of light can be suppressed. Moreover, the effect which reduces the illumination intensity nonuniformity of the light irradiated to the wall surface 20, and illumination nonuniformity is acquired.
  • the second incident surface 4b may be a diffusing surface to further reduce illuminance unevenness and illumination unevenness. That is, in the case of the configuration, the second incident surface 4b may be a diffusing surface in order to reduce the light reflected by Fresnel at the second incident surface 4b. By making the second incident surface 4b a diffusing surface, it is possible to reduce light that is Fresnel reflected by the second incident surface 4b.
  • the first exit surface 7a is a diffusing surface, the effect of reducing illuminance unevenness and illumination unevenness can be obtained. However, considering the light utilization efficiency, it is preferable that the first exit surface 7a be an optically polished surface.
  • the second exit surface 7b or the third entrance surface 5 as a diffusing surface in consideration of illuminance unevenness and illumination unevenness.
  • the 1st reflective surface 6 into the surface shape containing a several plane.
  • the surface shape of the first reflecting surface 6 is formed, for example, by arranging a plurality of strip-shaped surfaces long in the X-axis direction in the Y-axis direction. In particular, it is effective for uneven illumination due to the influence of light reflected by the second incident surface 4b, reflected by the first reflecting surface 6, and emitted from the second emitting surface 7b.
  • an optical element 3 having a circular emission surface 7 is shown.
  • the emission surface 7 may be rectangular.
  • the exit surface 7 may be polygonal. That is, it is possible to change the shape of the side surface 9 and direct the light reaching the side surface 9 toward the wall surface 20.
  • the some light source 2 may be arranged in the illuminating device 1, and the optical element 3 may be the shape extended in the arrangement direction.
  • the first incident surface 4a, the second incident surface 4b, the third incident surface 5, the first reflecting surface 6 and the second reflecting surface 8 are obtained by extending the cross-sectional shape of the YZ plane in the X-axis direction. It is described as a shape.
  • Each of the surfaces 4a, 4b, 5, 6, and 8 is formed by moving the cross-sectional shape of the YZ plane in the X-axis direction. That is, each surface 4a, 4b, 5, 6, 8 does not have a curvature in the X-axis direction.
  • the surfaces 4a, 4b, 5, 6, and 8 are not limited to this.
  • the first incident surface 4a and the second incident surface 4b may form a recess in the X-axis direction.
  • the "convex portion”, on the center line CL 1 indicates that to form a convex portion protruding in the Y-axis direction. That is, the convex portion, when viewed from the Z-axis direction, the portion on the center line CL 1 is shaped protruding.
  • FIG. 23 is a diagram showing a result of ray tracing of the illumination device 1.
  • FIG. 24 is a diagram illustrating a result of ray tracing of the illumination device 12.
  • FIG. 25 is a diagram illustrating a result of ray tracing of the illumination device 13. 23, 24, and 25, for convenience, the second emission surface 7b is an optical polishing surface.
  • FIG. 23 will be described.
  • the light ray 230a includes two types of light rays.
  • the first light beam enters from the first incident surface 4a and is directly emitted from the first emission surface 7a.
  • the second light ray enters from the first incident surface 4a, is reflected by the second reflecting surface 8, and is emitted from the first emitting surface 7a.
  • the light beam 230a is emitted as a light beam spread in the ⁇ Z-axis direction.
  • the light beam 230b is incident from the second incident surface 4b and is emitted from the first emission surface 7a or the second emission surface 7b.
  • the light beam 230b is emitted to the + Z-axis direction side from the light beam 230a.
  • the light ray 230c enters the third incident surface 5, is reflected by the first reflecting surface 6, and is emitted from the second emitting surface 7b.
  • the light beam reflected by the end of the first reflecting surface 6 on the + Z-axis direction side is emitted in parallel with the Y-axis.
  • the light ray 230c is emitted toward the + Z-axis direction side of the light ray 230b.
  • the light beam 230c is irradiated so as to overlap the light beam 230b.
  • FIG. 24 will be described.
  • the light beam 240a is the same as the light beam 230a.
  • the light beam 240b is the same as the light beam 230b. Therefore, these descriptions are omitted.
  • the light ray 240c enters the third incident surface 5, is reflected by the first reflecting surface 61, and is emitted from the second emitting surface 7b.
  • the light beam reflected at the end of the first reflecting surface 61 on the + Z-axis direction side travels in the + Z-axis direction. That is, the light ray 240c is emitted to the + Z-axis direction side from the light ray 230c.
  • FIG. 25 will be described.
  • the light ray 250a is the same as the light ray 230a.
  • the light ray 250b is the same as the light ray 230b. Therefore, these descriptions are omitted.
  • the light ray 250c enters the third incident surface 5, is reflected by the first reflecting surface 62, and is emitted from the second emitting surface 7b.
  • the light beam reflected by the end on the + Z-axis direction side of the first reflecting surface 62 travels in the ⁇ Z-axis direction. That is, the light ray 250c is emitted to the ⁇ Z axis direction side from the light ray 230c.
  • FIG. FIG. 12 is a configuration diagram schematically showing a main configuration of the illumination device 14 according to the second embodiment.
  • the illumination device 14 includes a light source 2 and an optical element 33.
  • the light source 2 emits light.
  • the light source 2 is the same as the light source 2 of the first embodiment.
  • the optical element 33 controls the light distribution of the light emitted from the light source 2.
  • the first incident surface 4a, the second incident surface 4b, the third incident surface 5, the first reflecting surface 6, the second reflecting surface 8, and the side surface 9 of the optical element 33 are shown in the first embodiment. Since the same structure as the structure of each structure and each modification can be taken, those description is abbreviate
  • the light source 2 is, for example, a light emitting diode.
  • the light source 2 may be a monochromatic light emitting diode that emits only red, green, or blue light.
  • the light source 2 may be a light source that generates white light by using a yellow phosphor for a blue light emitting diode.
  • a ⁇ 14 mm light emitting diode is used.
  • the light emitting diode may have a size of 3 mm or a size of 14 mm or more.
  • the optical element 33 will be described.
  • the optical element 33 is different from the first embodiment in the configuration of the emission surface 72a.
  • the optical element 33 is different in that a side surface 70c is formed.
  • the wall surface 20 is located on the ⁇ Z axis direction side with respect to the illumination device 14. Therefore, the illuminating device 14 irradiates light with a deviation from the optical axis C of the light source 2 in the direction of the irradiated object (wall surface 20).
  • the optical element 33 irradiates the incident light asymmetrically with respect to the optical axis C of the light source 2.
  • the optical element 33 emits light asymmetrically in the direction of the optical axis C and the exit plane 72 perpendicular intersection as the optical axis C of the center line CL 1. That is, the irradiated object (wall surface 20) is positioned in the asymmetric direction of the irradiation light. That is, the illuminating device 14 irradiates asymmetrical irradiation light in the direction of the irradiated object (wall surface 20).
  • the light incident on the first incident surface 4a or the second incident surface 4b is refracted. Then, the light incident from the first incident surface 4a or the second incident surface 4b travels to the first emission surface 72a.
  • the first emission surface 72a has, for example, a free-form surface shape.
  • This free-form surface shape a concave shape about a center line CL 1, the curvature becomes smaller in the ⁇ X-axis direction.
  • Centerline CL 1 passes through the optical axis C, it is a straight line parallel to the Z axis. That is, the center line CL 1 passes through the intersection of the optical axis C and the exit surface 72 is a straight line on the exit surface 72 extending in the direction of the wall surface 20 (object to be irradiated).
  • concave shape is provided in order to expand in a direction perpendicular to the center line CL 1 of the illumination light emitted. For this reason, a plurality of concave shapes may be formed.
  • the concave shape may be formed at a position away from the optical axis C. That is, the center line CL 1 may not intersect the optical axis C.
  • the concave shape is formed as a center line CL of the straight line parallel to the center line CL 1.
  • the shape of the first light exit surface 72a located on the center line CL 1 is concave. Then, the curvature of the shape of the first emission surface 72a decreases as it goes in the ⁇ X axis direction.
  • the light emitted from the first emission surface 72a is spread and irradiated on the wall surface 20 in the ⁇ X-axis direction. That is, when the light is emitted from the first emission surface 72a, the light divergence angle is increased.
  • the divergence angle of the light in the X-axis direction is increased. That is, the divergence angle of the light in the width direction of the wall surface 20 is increased. Then, it becomes possible to irradiate light over a wide range on the wall surface 20.
  • the second emission surface 7b is formed by a plane parallel to the ZX plane, for example.
  • a side surface 70c is formed.
  • the side surface 70c is formed on the outer periphery of the first emission surface 72a and the second emission surface 7b.
  • the optical element 33 has, for example, a shape obtained by adding thickness to the emission surface 7 of the optical element 1.
  • the thickness is equal to the height of the side surface 70c (dimension in the Y-axis direction).
  • the side surface 70c is an absorption surface or a diffusion surface.
  • the side surface 70c may be an optical polishing surface (optical surface). Note that, depending on the divergence angle characteristics of the light source 2, the illuminance unevenness on the wall surface 20 may be affected. Therefore, the side surface 70 c is preferably subjected to, for example, a black coating process. Further, the side surface 70c is preferably a diffusion surface.
  • FIG. 13 is a simulation diagram for explaining the effect of the second embodiment.
  • FIG. 13 shows an illuminance distribution by light emitted from the first emission surface 72a and the second emission surface 7b.
  • the first emission surface 72a has a concave shape.
  • the second emission surface 7b is a planar diffusion surface.
  • FIG. 13 shows the illuminance distribution on the wall surface 20 of the light emitted from the illumination device 14.
  • the side surface 70c is used as an absorption surface.
  • the side surface 70c is preferably a diffusion surface.
  • the arrangement of the illumination device 14 is the arrangement shown in FIG. In FIG. 13, the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • FIG. 13 confirms that the illuminance distribution of the illumination device 14 is uniform. Further, as compared with FIG. 3A of the first embodiment, it can be confirmed that the illuminance distribution is expanded in the ⁇ X-axis directions due to the effect of the first emission surface 72a. It was confirmed that the configuration of the second embodiment can realize a uniform illuminance distribution over a wide range with high light utilization efficiency.
  • FIG. 14 is a configuration diagram schematically showing a main configuration of the illumination device 15 according to the third modification of the second embodiment.
  • the illuminating device 15 shown in FIG. 14 differs from the illuminating device 14 of this Embodiment 2 in the structure of the 2nd output surface 7b.
  • the 2nd output surface 73b is a free-form surface shape similarly to the 1st output surface 72a.
  • the curvature becomes smaller in the ⁇ X-axis direction about the center line CL 1. That is, the second emission surface 7b of the optical element 33 has a planar shape.
  • the second emission surface 73b of the optical element 34 has a free-form surface shape.
  • the illumination device 15 is different from the illumination device 14.
  • the second emission surface 73b is, for example, a diffusion surface corresponding to a Gauss angle of 2 ° in Modification 3.
  • the side surface 71c is formed on the outer periphery of the first emission surface 72a and the second emission surface 73b.
  • the side surface 71c is an absorption surface or a diffusion surface.
  • the side surface 71c may be an optical polishing surface.
  • FIG. 15 is a simulation diagram for explaining the effect of the third modification.
  • the arrangement of the illumination device 15 is the arrangement shown in FIG.
  • FIG. 15A shows the illuminance distribution on the wall surface 20 of the light emitted from the illumination device 15.
  • FIG. 15B shows the illuminance distribution on the wall surface 20 of the light emitted from the second emission surface 73 b of the illumination device 15.
  • FIG. 15C shows the illuminance distribution on the wall surface 20 of the light emitted from the first emission surface 72a of the illumination device 15.
  • FIG. 15A shows the illuminance distribution by the light emitted from the first emission surface 72a and the second emission surface 73b.
  • FIG. 15B shows an illuminance distribution by the light emitted from the second emission surface 73b.
  • FIG. 15C shows an illuminance distribution by light emitted from the first emission surface 72a. That is, when the illuminance distribution of FIG. 15B and the illuminance distribution of FIG. 15C are superimposed, the illuminance distribution of FIG. 15A is obtained.
  • the simulation is performed with the side surface 71c as an absorption surface.
  • the side surface 71c is preferably a diffusion surface.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is displayed by dividing it into 10 contour lines.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • FIG. 15 (a) confirms that illuminance unevenness occurs in the region 140a. It is considered that the light irradiating the ⁇ Y axis direction side of the wall surface 20 has an influence. For this reason, the illuminance distribution (FIG. 15B) of the light emitted from the second emission surface 73b is confirmed.
  • FIG. 15B shows the illuminance distribution of the light emitted from the second emission surface 73b. And in the area
  • the second exit surface 73b is preferably a flat surface. This is the configuration of the optical element 33 of the illumination device 14 shown in FIG.
  • the second emission surface 73b is preferably a flat surface.
  • the second emission surface 73b need not be a flat surface.
  • the second exit surface 73b may be a free-form surface.
  • the free-form surface shape the curvature becomes smaller in the ⁇ X-axis direction about the center line CL 1.
  • the curvature of the recesses on the center line CL 1 of the second emission surface 73b is small.
  • the curvature of the X-axis direction may become small as the 2nd output surface 73b goes to + Z-axis direction.
  • the end on the ⁇ Z-axis direction side of the second exit surface 73b is connected to the end on the + Z-axis direction side of the first exit surface 72a. That is, the end on the ⁇ Z-axis direction side of the second emission surface 73b is a curved surface.
  • the curvature of the recessed part on the 2nd output surface 73b becomes small as it goes to + Z-axis direction.
  • the end on the + Z-axis direction side of the second emission surface 73b is a flat surface.
  • X-axis direction of curvature located on the center line CL 1 is continuously
  • the shape can be smaller. Thereby, the spread of the light irradiated to the lower side of the wall surface 20 can be suppressed. And it becomes possible to reduce the separation (area 140b) of the portion with high illuminance due to the influence of the irradiation distance.
  • FIG. 15C shows that the illuminance distribution on the wall surface 20 emitted from the first emission surface 72a is substantially uniform. Also from this result, it is confirmed that the shape of the second emission surface 73b causes uneven illuminance. And it can confirm that it is preferable that the 2nd output surface 7b shown in FIG. 12 is a plane.
  • the second embodiment is characterized in that the illuminance distribution of the first embodiment is increased in the X-axis direction.
  • Embodiment 2 the example from which the shape of the 2nd output surface 72b differs is shown.
  • both the first emission surface and the second emission surface may have a shape that widens the illuminance distribution in the X-axis direction.
  • the X-axis direction of the curvature of the direction of the second emission surface on the center line CL 1 than the first emission surface is small. That is, it is preferable that the second emission surface has a shape close to a plane.
  • the irradiated object is the wall surface 20.
  • the illuminating device 15 is arrange
  • the wall surface 20 is disposed on the ⁇ Z axis direction side of the lighting device 15. Therefore, the optical path length to the wall surface 20 of the light emitted from the second emission surface 73b is longer than the optical path length to the wall surface 20 of the light emitted from the first emission surface 72a.
  • the optical path length of the light emitted from the second emission surface 73b to the wall surface 20 is the wall surface 20 of the light emitted from the first emission surface 72a. It becomes shorter than the optical path length until. For this reason, it is desirable that the first emission surface 72a is flat and the second emission surface 73b is concave. In other words, the difference in optical path length to the irradiated object, changes the concave of the X-axis direction curvature around the center line CL 1 of the exit surface 7.
  • the second emission surface 7b is a flat surface, thereby suppressing the separation of the portion with high illuminance (illuminance unevenness).
  • the illumination device 15 by forming a convex portion on the third incident surface 5, it is possible to reduce the spread of light due to the concave shape of the second emission surface 73 b.
  • the first emission surface 72a and the second emission surface 73b can be made the same surface.
  • the 1st output surface 72a and the 2nd output surface 73b can be made into the same concave shape. That is, by forming a convex portion on the third incident surface 5, the divergence angle of the light emitted from the second emission surface 73b can be made smaller than the divergence angle of the light emitted from the first emission surface 72a. . And it becomes possible to reduce the breadth of the light irradiated to the wall surface 20. That is, the spread of light irradiated on the wall surface 20 is narrowed. Then, separation of the illuminance distribution on the wall surface 20 is suppressed. That is, an effect of suppressing separation (illuminance unevenness) of a portion with high illuminance can be obtained.
  • the first incident surface 4a and the second incident surface 4b are described as planes.
  • the thickness of the optical elements 33 and 34 in the Y-axis direction is large, the light emitted from the first emission surface 72a and the second emission surfaces 7b and 73b decreases. For this reason, it is preferable to improve the light utilization efficiency by forming convex portions on the first incident surface 4a and the second incident surface 4b.
  • the “convex portion” described in the third incident surface 5, the first incident surface 4 a, and the second incident surface 4 b refers to the light on the line (center line) corresponding to the center line CL 1 . It shows that the convex part which protrudes in the incident side is formed.
  • Line corresponding to the center line CL 1 (center line) the third incident surface 5, which is a line on the surface of the first incident surface 4a or the second incident surface 4b.
  • the convex portion protrudes in the + Y axis direction.
  • the convex portion projects in the ⁇ Z axis direction.
  • the line (center line) corresponding to the center line CL 1 passes through the intersection of the optical axis C and the exit surfaces 72 and 73 and extends in the direction of the wall surface 20 (irradiation object) (center line CL 1 ). (Center line).
  • the “line corresponding to the center line CL 1 ” is, for example, a straight line connecting the intersections on each surface of the light rays reaching the center line CL 1 on each surface. Then, the light beam is emitted from the center of the light emitting surface of the light source 2. Further, the optical path length of the light beam from the light emitting surface of the light source 2 to the center line CL 1 is the shortest among the light beams that reach the center line CL 1 .
  • the optical element is symmetric with respect to a plane including the optical axis C and parallel to the YZ plane.
  • a line connecting an intersection on each side of the ray and each surface shown in FIG. 23, 24, 25 is "corresponding line to the center line CL 1".
  • the corresponding line is a straight line.
  • the corresponding line is a curve.
  • the “plane including the optical axis C and parallel to the YZ plane” is a plane including the optical axis C and a reference straight line described later.
  • a center line (referred to as a reference straight line) is a straight line that passes through the intersection P between the optical axis C and the exit surface 7 and is perpendicular to the optical axis C.
  • the illumination light is irradiated asymmetrically in the direction of the center line (reference straight line).
  • the center line CL 1 of the exit surface 72 and 73 is also considered a line corresponding to the center line (reference line) (center line).
  • the straight line corresponding to the reference straight line may include a straight line that matches the reference straight line.
  • the straight line that is parallel to the reference straight line may include a straight line that matches the reference straight line.
  • the center line CL 1 of the exit surface 72 and 73 centered concave shape changes the divergence angle in the vertical direction (X axis direction) in the reference straight line on the ZX plane.
  • the ZX plane is a plane perpendicular to the optical axis C.
  • the direction perpendicular to the reference line on the ZX plane is the direction in which the divergence angle is changed. That is, the direction perpendicular to the reference line on the ZX plane, coincides with the direction perpendicular to the center line CL 1 on the exit surface 72 and 73.
  • the concave shapes on the other surfaces corresponding to the concave shapes on the emission surfaces 72 and 73 are changed in the same direction as the concave shape on the emission surfaces 72 and 73 on the emission surfaces 72 and 73. That is, the direction perpendicular to the reference line on the ZX plane is consistent with optically direction perpendicular to the center line CL 2 of the other surface.
  • the “perpendicular direction” is a direction in which the divergence angle is changed. The same applies to a convex shape that changes the divergence angle.
  • FIG. 26 is a perspective view of the optical element 33a as viewed from the ⁇ Y-axis direction.
  • the first emission surface 72a of the optical element 33a has a curvature also in the Z-axis direction.
  • the region 720a is inclined in a direction in which the ZX plane is rotated counterclockwise as viewed from the ⁇ X axis direction.
  • the region 720b is inclined in the direction in which the ZX plane is rotated clockwise as viewed from the ⁇ X axis direction.
  • the center line CL 1 is a line along the curved surface. That is, the center line CL 1 is a line on the emission surface 7 that passes through the intersection P between the optical axis C and the emission surface 7 and extends in the direction of the wall surface 20 (object to be irradiated). Therefore, the center line CL 1 may take or lines or curves were bent than straight.
  • the second embodiment has the same configuration as that of the first embodiment except for the configuration of the first emission surface and the second emission surface of the first embodiment.
  • the contents described in the first embodiment are applied to the contents not described in the second embodiment.
  • FIG. 16 is a configuration diagram schematically showing the main configuration of the illumination device 16 according to the third embodiment.
  • the illumination device 16 includes a light source 2 and an optical element 35.
  • the light source 2 emits light.
  • the light source 2 is the same as the light source 2 of the first embodiment.
  • the optical element 35 controls the light distribution of the light emitted from the light source 2.
  • the third incident surface 5, the first reflecting surface 6, the second reflecting surface 8, the first emitting surface 72a, the second emitting surface 7b, the side surface 9 and the side surface 70c of the optical element 35 are described in the embodiment. Since the same structure as the structure shown by 2 and the structure of the modification can be taken, those description is abbreviate
  • the optical element 35 will be described.
  • the optical element 35 differs from the second embodiment in the configuration of the first incident surface 41a and the second incident surface 41b.
  • the first incident surface 41a and the second incident surface 41b are free-form surfaces.
  • the free-form surface is a curved surface such that curvature becomes smaller in the ⁇ X-axis direction about the center line CL 2.
  • Shape of the first incidence surface 41a and the second incidence surface 41b located on the center line CL 2 is concave.
  • Centerline CL 2 is a line corresponding to the center line CL 1 of the above.
  • Center line CL 1 is a straight line on the exit surface 72 extending in the direction of the optical axis C and the exit surface 72 through the wall of the intersection of the 20 (object to be irradiated).
  • the optical element 35 of the illuminating device 16 has a symmetrical shape with respect to a plane including the optical axis C and parallel to the YZ plane. Therefore, when viewed from the Y axis direction, the center line CL 1 overlaps the CL 2. That is, the center lines CL 1 and CL 2 are straight lines passing through the optical axis C and parallel to the Z axis.
  • a shape obtained by rotating the free curved surface shape of the first emission surface 72a by 180 ° around the Z axis is centered on the X axis in accordance with the first incident surface 41a or the second incident surface 41b. This is the case when tilted. In this way, concave surfaces are formed on the first incident surface 41a and the second incident surface 41b.
  • the light incident on the first incident surface 41a and the second incident surface 41b is refracted so as to spread in the ⁇ X axis direction.
  • the light incident from the first incident surface 41a and the second incident surface 41b travels to the first emission surface 72a.
  • the first emission surface 72a has a free-form surface shape.
  • the free-form surface is formed so that the curvature becomes smaller in the ⁇ X-axis direction around the center line CL 1.
  • the light emitted from the first emission surface 72a further spreads in the ⁇ X axis directions and is irradiated onto the wall surface 20. That is, the light emitted from the first emission surface 72 a is irradiated while spreading in the width direction of the wall surface 20. Then, it becomes possible to irradiate light over a wide range on the wall surface 20.
  • the side surface 70 c is the same as the side surface 70 c of the optical element 33.
  • the side surface 70c is formed on the outer peripheral side of the first emission surface 72a and the second emission surface 7b.
  • the side surface 70c is an absorption surface or a diffusion surface.
  • the side surface 70c may be an optical polishing surface.
  • the side surface 70 c may affect the illuminance unevenness on the wall surface 20. For this reason, the side surface 70c is preferably blackened or diffused.
  • FIG. 17 is a simulation diagram for explaining the effect of the third embodiment.
  • FIG. 17A shows the illuminance distribution on the wall surface 20 of the light emitted from the lighting device 16.
  • FIG. 17B shows the illuminance distribution on the wall surface 20 of the light emitted from the first emission surface 72a.
  • the arrangement of the illumination device 16 is the arrangement shown in FIG.
  • FIG. 17A shows the illuminance distribution by the light emitted from the first emission surface 72a and the second emission surface 7b.
  • FIG. 17B is an illuminance distribution by the light emitted from the first emission surface 72a.
  • the simulation is performed with the side surface 70c as the absorption surface.
  • the side surface 70c is preferably a diffusion surface.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines and displayed.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • the illuminance distribution is uniform. Further, it can be confirmed that the spread of the illuminance distribution in the X-axis direction near 1350 mm in the Y-axis direction is larger than the illuminance distribution in FIG. 13 of the second embodiment. That is, it can be confirmed that the rectangular illuminance distribution can be a wide elliptical distribution by making the first incident surface 41a and the second incident surface 41b concave.
  • FIG. 17B it can be confirmed that the spread of the illuminance distribution in the X-axis direction near 1350 mm in the Y-axis direction is larger than the illuminance distribution in FIG. 15C.
  • FIG. 13 shows the illuminance distribution on the wall surface 20 of the light emitted from the first emission surface 72a and the second emission surface 7b of the illumination device 14 of FIG.
  • FIG.15 (c) shows the illumination intensity distribution on the wall surface 20 of the light radiate
  • the effect of forming the recesses on the first incident surface 41a and the second incident surface 41b is confirmed.
  • the effect of the second incident surface 41b having an angle with respect to the ZX plane is great.
  • the inclination of the second incident surface 41b of the optical element 35 is the same as in the above-described embodiments and modifications.
  • the second incident surface 41b is inclined with respect to the ZX plane.
  • the second incident surface 41b is inclined in the Y-axis direction with respect to the ZX plane. That is, the second incident surface 41b is a surface obtained by rotating a plane parallel to the ZX plane around the X axis in a clockwise direction when viewed from + X.
  • FIG. 18 is a configuration diagram schematically showing a main configuration of an illuminating device 17 according to the fourth modification of the third embodiment.
  • the illuminating device 17 is different in that the first incident surface 4a and the second incident surface 4b of the illuminating device 14 are used as the incident surface 4c.
  • the incident surface 4c is, for example, a plane parallel to the ZX plane.
  • FIG. 19 is a simulation diagram for explaining the effect of the fourth modification of the third embodiment.
  • FIG. 19 shows the illuminance distribution on the wall surface 20 of the light emitted from the illumination device 17. That is, FIG. 19 shows the illuminance distribution by the light emitted from the first emission surface 72a and the second emission surface 7b.
  • the arrangement of the illumination device 17 is the arrangement shown in FIG.
  • the simulation is performed with the side surface 70c as the absorption surface.
  • the side surface 70c is preferably a diffusion surface.
  • the horizontal axis indicates the position in the X-axis direction.
  • the vertical axis indicates the position in the Y-axis direction.
  • the X-axis direction is the width direction of the wall surface 20.
  • the Y-axis direction is the height direction of the wall surface 20.
  • the illuminance is divided into 10 parts by contour lines and displayed.
  • the illuminance becomes brighter as it goes to the center of the contour line.
  • FIG. 13 is an illuminance distribution by light emitted from the first emission surface 72a and the second emission surface 7b.
  • FIG. 15C shows the illuminance distribution of light incident from the first incident surface 4a or the second incident surface 4b and emitted from the first emission surface 72a.
  • the optical element 36 has the same configuration as the optical elements 33 and 34 in the first emission surface 72a. Nevertheless, in Modification 4 of Embodiment 3, the effect of widening the illuminance distribution in the X-axis direction can be confirmed.
  • This also incident surface 4c is a plan, the shape of the first light exit surface 72a, as a center line CL 1, which is free-form surface curvature becomes smaller in the ⁇ X-axis direction. Accordingly, FIG. 19 shows that the illuminance distribution can be expanded in the X-axis direction.
  • the second incident surface 41b has an angle (inclination) with respect to the ZX plane.
  • the illuminating device 16 has the recessed part in the 2nd entrance plane 41b.
  • FIG. 17 shows that the illumination device 16 can greatly widen the illuminance distribution in an elliptical shape.
  • the second incident surface 41b has an angle (inclination) in the Z-axis direction with respect to the ZX plane, it is preferable to form a recess in the second incident surface 41b. Thereby, it can be confirmed that the effect that the illuminance distribution on the wall surface 20 can be expanded in a wide range can be obtained.
  • the optical element 36 when the distance in the Y-axis direction from the incident surface 4c to the first emission surface 72a is long, if the concave shape is formed on the incident surface 4c, the light incident from the incident surface 4c is transmitted through the side surface 9. It is reflected and becomes unnecessary light. Alternatively, there is a problem that light incident from the incident surface 4c does not reach the first emission surface 72a.
  • the distance in the Y-axis direction from the second incident surface 41b to the first emission surface 72a is shortened. For this reason, even if the concave shape is provided on the second incident surface 41b, the light efficiently reaches the first emission surface 72a, which is effective in expanding the illuminance distribution over a wide range.
  • the optical path length to the output surface 72 is shorter in the second incident surface 41b than in the incident surface 4c. For this reason, even if the curvature of the concave surface is increased, more light rays reach the emission surface 72. That is, for example, when the curvature of the concave surface of the first incident surface 41a is increased, the number of rays reaching the side surface 9 increases. Therefore, the number of light rays that reach the emission surface 72 is reduced. In order to efficiently spread the illuminance distribution, it is preferable that the illuminance distribution is inclined like the second incident surface 41b.
  • FIG. 20 is a configuration diagram schematically showing the main configuration of the illumination device 18 according to the fifth modification of the third embodiment.
  • the lighting device 18 is different from the lighting device 16 of the third embodiment in the configuration of the first reflecting surface 63.
  • An end portion of the first reflecting surface 63 in the ⁇ Y axis direction is extended in the ⁇ Y axis direction as compared with the illumination device 16. That is, the length B 4 is longer on the exit surface 72 side than the optical element 35.
  • the illuminating device 16 In the illuminating device 16, light emitted from the light source 2 that has passed through the ⁇ Y-axis direction side of the end of the first reflecting surface 6 on the ⁇ Y-axis direction side travels in the + Z-axis direction. Was.
  • the illuminating device 17 can reflect this light in the direction of the wall surface 20 ( ⁇ Z-axis direction).
  • FIG. 22 is an example of a perspective view of the illuminating device 18 of Modification 5 of Embodiment 3 shown in FIG.
  • the concave shape described in the optical element 35 of the illumination device 16 is formed on the first incident surface 41a and the second incident surface 41b. That is, the first incident surface 41a has a concave shape in the X-axis direction.
  • the second incident surface 41b is formed with a concave surface having a concave shape from the end in the + X axis direction and the end in the ⁇ X axis direction toward the center direction in the X axis direction. That is, the second incident surface 41b has a concave shape in the X-axis direction.
  • FIG. 21 is a ray tracing diagram showing the effect of the fifth modification of the third embodiment.
  • the light beam 200 reflected at the end of the first reflecting surface 63 on the ⁇ Y-axis direction side is emitted with a small angle (inclination) with respect to the optical axis C. If the first reflecting surface 63 is not formed by being stretched, the light beam 200 is emitted in the + Z-axis direction with a large angle with respect to the optical axis C. That is, in the case of the optical element 35, a light beam similar to the light beam 200 travels to the + Z axis direction side from the light beam 200.
  • the reflection of the light beam 200 on the first reflecting surface 63 is, for example, total reflection.
  • the third embodiment has the same configuration as that of the first embodiment except for the configuration of the first incident surface, the second incident surface, the first emission surface, and the second emission surface.
  • the first reflecting surface 63 of the modified example 5 is different from the first reflecting surface 6 of the first embodiment.
  • the contents described in the first embodiment also apply to the contents not described in the third embodiment.
  • the third embodiment is characterized in that the illuminance distribution of the second embodiment is increased in the X-axis direction.
  • the shapes of the first incident surface and the second incident surface are different from those of the second embodiment.
  • Other configurations are the same as those of the second embodiment.
  • the contents described in the second embodiment are also applied to the contents not described in the third embodiment.
  • the illumination devices 14, 15, 16, 17, and 18 shown in Embodiments 2 and 3 can adjust the width of the illuminated region even when the optical path length varies depending on the light rays of the irradiation light. And the illuminating device 14, 15, 16, 17, 18 can make the width
  • supplementary notes (1) to (3) are each independently assigned a reference numeral. Therefore, for example, “Appendix 1” exists in both appendices (1) and (2).
  • the features of the device of appendix (1) can be imparted to the device of appendix (2) or appendix (3).
  • the feature of the device of appendix (2) can be imparted to the device of appendix (3).
  • the feature of the device in appendix (1), the feature of the device in appendix (2), and the feature of the device in appendix (3) can be combined with each other.
  • ⁇ Appendix 1> Comprising a light source and an optical element for entering the light emitted from the light source,
  • the optical element has a first incident surface, a second incident surface, a third incident surface, a first emitting surface, a second emitting surface, and a first reflecting surface, One end of the first incident surface and one end of the second incident surface are connected on the light source side, One end of the third entrance surface and the other end of the second entrance surface are connected on the second exit surface side, The other end of the third incident surface and the end of the first reflecting surface are connected on the light source side,
  • the light incident on the first incident surface and the second incident surface is emitted from the first emission surface,
  • the light incident on the third incident surface is reflected by the first reflecting surface and emitted from the second emitting surface,
  • An illumination device in which the second emission surface is a surface subjected to diffusion treatment.
  • ⁇ Appendix 2> Comprising a light source and an optical element for entering the light emitted from the light source,
  • the optical element has a first incident surface, a second incident surface, a third incident surface, a first emitting surface, a second emitting surface, and a first reflecting surface, One end of the first incident surface and one end of the second incident surface are connected on the light source side, One end of the third entrance surface and the other end of the second entrance surface are connected on the second exit surface side, The other end of the third incident surface and the end of the first reflecting surface are connected on the light source side,
  • the light incident on the first incident surface and the second incident surface is emitted from the first emission surface,
  • the light incident on the third incident surface is reflected by the first reflecting surface and emitted from the second emitting surface,
  • An illumination device wherein the third incident surface is a surface subjected to diffusion treatment.
  • the first emission surface and the second emission surface have a concave shape at the center and a free-form surface shape in which a curved surface is formed so that the curvature increases as the distance from the center increases.
  • the first emission surface has a concave shape at the center and a free curved surface shape in which a curved surface is formed so that the curvature increases as the distance from the center increases.
  • the first emission surface and the second emission surface have a concave shape at the center and a free-form surface shape in which a curved surface is formed so that the curvature increases as the distance from the center increases.
  • Appendix 6 The lighting device according to any one of appendices 1 to 5, wherein the second incident surface has a recess formed on the first light exit surface side.
  • the optical element has a second reflecting surface connected on the light source side with the other end of the first incident surface, Additional remarks 1 to 5 in which the second exit surface side end portion of the first reflection surface is located closer to the exit surface side of the optical element than the first exit surface side end portion of the second reflection surface.
  • Appendix 8 The lighting device according to any one of appendices 1 to 7, wherein the first incident surface and the second incident surface are formed on the same surface.
  • a light source that emits light;
  • An optical element that enters the light and irradiates the incident light asymmetrically with respect to the optical axis of the light source;
  • the optical element includes a first incident surface on which the light is incident and a reflecting surface that reflects the light,
  • the light that has reached the first incident surface from the light source includes first light that passes through the first incident surface and second light that is reflected by the first incident surface;
  • An illuminating device including a diffusion unit that diffuses the second light on an optical path of the second light.
  • Appendix 3 The illumination device according to appendix 1 or 2, wherein the optical element includes an emission surface that emits light reflected by the reflection surface.
  • ⁇ Appendix 4> The illuminating device according to attachment 3, wherein the diffusing unit is provided on the emission surface.
  • Appendix 5 The illumination device according to any one of appendices 1 to 4, wherein the third light that directly reaches the reflection surface from the light source is reflected by the reflection surface.
  • Appendix 6 The lighting device according to appendix 5, wherein the second light is transmitted through a region closer to the optical axis than the third light on the emission surface.
  • Appendix 7 The lighting device according to appendix 5 or 6, wherein the reflecting surface has a concave shape with respect to the third light reaching the reflecting surface in the direction of the optical axis.
  • a first region of the first incident surface where the second light is reflected is inclined with respect to a plane perpendicular to the optical axis;
  • the first end of the first region that is closer to the optical axis is any one of appendices 1 to 7 that is located closer to the light source in the direction of the optical axis than the second end that is far from the optical axis.
  • a second region of the reflecting surface where the second light is reflected is inclined with respect to a plane perpendicular to the optical axis; Any one of Supplementary notes 1 to 8, wherein the third end portion of the second region near the optical axis is located closer to the light source in the direction of the optical axis than the fourth end portion far from the optical axis.
  • the optical element includes a second incident surface, The lighting device according to any one of supplementary notes 1 to 4, wherein the second incident surface is disposed between the first incident surface and the reflecting surface.
  • Appendix 12 The illuminating device according to appendix 10 or 11, wherein the second light and the third light that directly reaches the reflecting surface from the light source pass through the second incident surface and reach the reflecting surface.
  • Appendix 13 The lighting device according to appendix 12, wherein the second light is transmitted through a region closer to the optical axis than the third light on the emission surface.
  • Appendix 14 The illuminating device according to appendix 12 or 13, wherein the reflecting surface is concave with respect to the third light reaching the reflecting surface in the direction of the optical axis.
  • a first region of the first incident surface where the second light is reflected is inclined with respect to a plane perpendicular to the optical axis; Any one of Supplementary Notes 10 to 14, wherein the first end portion of the first region near the optical axis is located closer to the light source in the direction of the optical axis than the second end portion far from the optical axis.
  • a second region of the reflecting surface where the second light is reflected is inclined with respect to a plane perpendicular to the optical axis; Any one of Supplementary Notes 10 to 18, wherein the third end portion of the second region near the optical axis is located closer to the light source in the direction of the optical axis than the fourth end portion far from the optical axis.
  • the second incident surface is inclined with respect to a plane perpendicular to the optical axis, and in the direction of the optical axis, a fifth end close to the light source and a sixth end far from the light source
  • the lighting device according to any one of supplementary notes 10 to 14, including:
  • a first region of the first incident surface where the second light is reflected is inclined with respect to a plane perpendicular to the optical axis;
  • Appendix 19 The lighting device according to appendix 18, wherein the sixth end is disposed at the position of the second end.
  • a second region of the reflecting surface where the second light is reflected is inclined with respect to a plane perpendicular to the optical axis; Any one of Supplementary notes 17 to 20, wherein the third end portion of the second region near the optical axis is located closer to the light source in the direction of the optical axis than the fourth end portion far from the optical axis.
  • ⁇ Appendix 24> The illumination device according to any one of supplementary notes 1 to 23, wherein the second light is included in illumination light.
  • ⁇ Appendix 26> The lighting device according to any one of supplementary notes 1 to 25, wherein the first incident surface is disposed closer to the optical axis than the reflecting surface.
  • ⁇ Appendix 27> 27 The illuminating device according to any one of appendices 1 to 26, wherein the scattering characteristic of the diffusing section is 2 to 4 degrees in terms of a Gauss angle.
  • ⁇ Appendix 28> The illuminating device according to any one of supplementary notes 1 to 27, wherein the diffusion portion is formed of a surface including a plurality of planes.
  • ⁇ Appendix 29> The illuminating device according to any one of supplementary notes 1 to 27, wherein the diffusion unit is formed of a surface including a plurality of curved surfaces.
  • ⁇ Appendix 30> 30 The illumination device according to appendix 28 or 29, wherein the diffusing unit is provided on the reflecting surface.
  • Appendix 4 The lighting device according to appendix 2 or 3, wherein the divergence angle is a divergence angle in a direction perpendicular to the reference straight line on the emission surface.
  • the optical element is a line corresponding to a straight line parallel to the reference straight line, the surface having at least one of a refracting surface and a reflecting surface on the optical path of the light as a central axis.
  • the illuminating device according to any one of appendices 2 to 4, wherein a curved surface shape that changes a divergence angle of the light is formed.
  • the optical element includes a curved surface shape that changes a divergence angle of the light on a surface on an optical path of the light,
  • the lighting device according to any one of appendices 2 to 4, wherein the curved surface shape is curved with a line on the surface corresponding to a straight line parallel to the reference straight line as a center line.
  • Appendix 7 The lighting device according to appendix 5 or 6, wherein the optical element includes a first surface that increases the divergence angle by the curved surface shape.
  • the first surface is a refracting surface in which the curved surface shape is concave.
  • the curvature of the concave shape of the region on the surface through which the light beam having the short optical path length of the light irradiated from the emission surface is transmitted is that of the concave shape of the region on the surface through which the light beam having the long optical path length is transmitted.
  • Appendix 9 The lighting device according to any one of appendixes 7 and 8, wherein the first surface is the emission surface.
  • ⁇ Appendix 10> The curvature of the convex shape of the region on the surface where the first surface is a reflective surface having a convex shape and the light beam having a short optical path length of the light irradiated from the emission surface is reflected by the first surface.
  • ⁇ Appendix 11> 11 The illumination device according to any one of appendices 7 to 10, wherein a region on the first surface through which a light beam having a long optical path passes includes a planar shape.
  • ⁇ Appendix 13> The illuminating device according to attachment 12, wherein the second surface is located closer to the light source than the first surface on the light path of the light.
  • Appendix 14 The lighting device according to appendix 5 or 6, wherein the optical element includes a second surface that reduces the divergence angle by the curved surface shape.
  • Appendix 15 The lighting device according to any one of appendices 1 to 14, wherein the second region includes a planar shape.
  • the optical element includes a first incident surface on which the light is incident and a reflecting surface that reflects the light,
  • the light that has reached the first incident surface from the light source includes first light that passes through the first incident surface and second light that is reflected by the first incident surface;
  • the lighting device according to any one of supplementary notes 1 to 15, further comprising a diffusion unit that diffuses the second light on the optical path of the second light.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un dispositif d'éclairage (1) comprenant une source de lumière (2) et un élément optique (3). La source de lumière (2) émet de la lumière. L'élément optique (3) reçoit une lumière incidente et propage la lumière incidente de manière asymétrique par rapport à un axe optique (C) de la source de lumière (2). L'élément optique (3) comprend une première surface d'incidence (4b) sur laquelle la lumière est incidente, et une surface réfléchissante (6) qui réfléchit la lumière. La lumière qui atteint la première surface d'incidence (4b) à partir de la source de lumière (2) comprend une première lumière (L5) qui est transmise à travers la première surface d'incidence (4b), et une seconde lumière (L6) réfléchie par la première surface d'incidence (4b). Sur le trajet optique de la seconde lumière (L6), l'élément optique (3) comporte une partie de diffusion servant à diffuser ladite seconde lumière.
PCT/JP2017/007516 2016-03-02 2017-02-27 Dispositif d'éclairage WO2017150456A1 (fr)

Priority Applications (3)

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CN201780013578.2A CN108779906B (zh) 2016-03-02 2017-02-27 照明装置
DE112017001098.5T DE112017001098B4 (de) 2016-03-02 2017-02-27 Beleuchtungsvorrichtung
JP2018503298A JP6695418B2 (ja) 2016-03-02 2017-02-27 照明装置

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JP2016-040089 2016-03-02
JP2016040089 2016-03-02

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WO2020194891A1 (fr) * 2019-03-28 2020-10-01 株式会社エンプラス Élément de commande de flux lumineux, dispositif électroluminescent et dispositif d'éclairage
CN113623614A (zh) * 2021-06-18 2021-11-09 浙江大华技术股份有限公司 一种补光用偏光透镜、补光控制方法及相关装置
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US11719398B1 (en) 2022-07-29 2023-08-08 Spectrum Lighting, Inc. Recessed downlight

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JPWO2017150456A1 (ja) 2018-12-06
DE112017001098B4 (de) 2021-12-09
CN108779906A (zh) 2018-11-09
JP6695418B2 (ja) 2020-05-20
CN108779906B (zh) 2021-08-27
DE112017001098T5 (de) 2019-02-28

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