JP5729859B2 - Luminous flux control member, light emitting device, and illumination device - Google Patents

Description

  The present invention relates to a light flux controlling member, a light emitting device, and an illuminating device, and more particularly, to a light emitting device that illuminates a plate surface, ceiling, wall surface, floor surface, signboard, etc., an illuminating device, and a light flux controlling member used for them.

  Conventionally, light emitting devices for spot illumination that illuminate a specific region by irradiating light in a specific direction have been used in applications such as auxiliary illumination, ceiling illumination, and showcase illumination. In recent years, light emitting diodes (LEDs) have been used as light sources of light emitting devices for spot illumination.

  Light emitting diodes are small, power efficient and emit bright colors, are semiconductor elements, so there is no fear of running out of spheres, etc., excellent initial drive characteristics, strong resistance to repeated vibration and on / off lighting, etc. Has characteristics.

  Further, as a light emitting device for spot illumination, a device that controls light distribution characteristics of light emitted from a light emitting diode using an illumination lens symmetrical to the optical axis of the light emitting diode is known (for example, Patent Document 1). In Patent Document 1, a lens having a total reflection surface is arranged on the emission side of the light emitting diode, and light emitted from the light emitting diode at a large angle with respect to the optical axis is incident on the lens. Thereafter, the light is totally reflected on the total reflection surface, and the light distribution is narrowed and emitted. That is, in Patent Document 1, when the surface to be irradiated is irradiated with the light emitted from the light emitting device and the entire surface to be irradiated is intended to be illuminated uniformly, a distance from the light emitting device can be irradiated with a sufficient amount of light. It is necessary to narrow the light distribution.

JP 2005-268166 A

  However, in the conventional light emitting device for spot illumination, since the light distribution of the emitted light is narrowed so that the emitted light reaches far from the light source, the vicinity of the light source on the irradiated surface or the optical axis of the light source In a region irradiated with light emitted from the light emitting device at a large angle, there is a problem that a dark portion is generated without obtaining a sufficient amount of light.

  The object of the present invention is to emit light with a good balance between light traveling toward the irradiated surface relatively far from the light source and light traveling to a position where light emitted at a large angle with respect to the optical axis of the light source can be irradiated, The present invention is to provide a light emitting device, an illuminating device, and a light beam control member used for them that can uniformly irradiate the entire irradiated surface.

  The light flux controlling member of the present invention is disposed facing the light emitting element, and the light emitting element facing surface portion in which a concave portion for allowing light from the light emitting element to enter the light flux controlling member is formed, and the light emitting element facing surface portion The light emitting element is formed on the opposite side of the light emitting element, and the light emitting element facing surface part, the total reflection surface extending from the outer peripheral end of the light emitting element facing surface part toward the outer peripheral end of the output surface, the recess is A first incident surface formed so as to intersect the central axis, and a second incident surface extending from an outer peripheral end of the first incident surface toward the light emitting element, and the total reflection surface is The light incident on the second incident surface is formed so as to gradually increase in diameter from the light emitting element facing surface portion side toward the light emitting surface side so as to be totally reflected toward the light emitting surface. The light diffusibility is more at the outer peripheral end than the vicinity of the central axis. In addition, the location where the first cross section including the central axis intersects with the second cross section which includes the central axis and intersects the second cross section perpendicular to the first cross section is higher in light diffusibility. A configuration in which a rough surface portion is formed is adopted.

  The light-emitting device of the present invention is a light-emitting device comprising a light-emitting element and a light beam control member that receives light emitted from the light-emitting element and controls a traveling direction of the incident light. The light flux controlling member and the light emitting element are disposed so that a central axis of the light flux controlling member coincides with an optical axis of the light emitting element, and the light flux controlling member is disposed to face the light emitting element, and the light emission A light emitting element facing surface portion in which a recess for allowing light from the element to enter the light flux controlling member, an emission surface formed on a side opposite to the light emitting element with respect to the light emitting element facing surface portion, and A total reflection surface extending from an outer peripheral end portion of the light emitting element facing surface portion toward an outer peripheral end portion of the emission surface, and the concave portion has a first incident surface formed to intersect the central axis, and the first The light emission from the outer peripheral edge of one incident surface A second incident surface extending toward the child side, and the total reflection surface is such that the light incident on the second incident surface is totally reflected toward the emission surface, and the light emitting element facing surface side The exit surface is formed so as to gradually increase in diameter toward the exit surface side, and the exit surface has higher light diffusibility at the outer peripheral end than the vicinity of the center axis, and any first including the center axis. A configuration is adopted in which a rough surface portion is formed so that light diffusivity is higher at a location that intersects the cross section than at a location that intersects the second cross section that includes the central axis and is orthogonal to the first cross section.

  The light emitting device of the present invention is a light emitting device comprising: a light emitting element; and a light beam control member that receives light emitted from the light emitting element and controls a traveling direction of the incident light. The light flux controlling member and the light emitting element are arranged so that the central axis of the light flux controlling member coincides with the optical axis of the light emitting element, and the light flux controlling member is arranged to face the light emitting element, A light emitting element facing surface portion in which a concave portion for allowing light from the light emitting element to enter the light flux controlling member, and an emitting surface formed on the opposite side of the light emitting element with respect to the light emitting element facing surface portion; A total reflection surface extending from an outer peripheral end portion of the light emitting element facing surface portion toward an outer peripheral end portion of the emission surface, and the concave portion is formed so as to intersect the central axis, From the outer peripheral edge of the first incident surface A second incident surface extending toward the light emitting element side, and the total reflection surface is configured to face the light emitting element so as to totally reflect the light incident on the second incident surface toward the emission surface. A portion that is formed so as to gradually increase in diameter from the side toward the emission surface side and intersects with an arbitrary first cross section including the central axis includes the central axis and is orthogonal to the first cross section. A configuration is adopted in which the rough surface portion is formed so that the light diffusibility is higher than the location where the two cross sections intersect.

  An illuminating device of the present invention includes the light emitting device according to any one of the above and an irradiated surface irradiated by the light emitting device, wherein the first cross section of the light emitting device is with respect to the irradiated surface. The structure which arrange | positions the said light-emitting device so as to be orthogonal is taken.

  In addition, an illumination device according to the present invention includes the light-emitting device according to any one of the above and an irradiated surface irradiated by the light-emitting device, and the first cross section of the light-emitting device is on the irradiated surface. A configuration is adopted in which the light emitting device is arranged so as to be parallel to each other.

  According to the present invention, by emitting light in a balanced manner, the light traveling toward the irradiated surface relatively far from the light source and the light traveling to a position where the light emitted at a large angle with respect to the optical axis of the light source can be irradiated, The entire irradiated surface can be irradiated uniformly.

Sectional drawing of the light-emitting device which concerns on Embodiment 1 of this invention The bottom view of the light beam control member in Embodiment 1 of this invention The top view of the light beam control member in Embodiment 1 of this invention Side view of light flux controlling member in Embodiment 1 of the present invention The front view of the light beam control member in Embodiment 1 of this invention The front view of the illuminating device which concerns on Embodiment 1 of this invention. Side surface sectional drawing of the illuminating device which concerns on Embodiment 1 of this invention. XX sectional view of FIG. 3B The top view which expanded a part of illuminating device which concerns on Embodiment 1 of this invention. Image diagram showing illuminance distribution on the illuminated surface by a conventional light emitting device The image figure which shows the illumination intensity distribution in the to-be-irradiated surface of the illuminating device which concerns on Embodiment 1 of this invention. The figure which shows the illumination intensity distribution on the boundary line shown in FIG. 5, and the illumination intensity distribution in the same position as the boundary line of FIG. 5 shown in FIG. The bottom view of the light beam control member in Embodiment 2 of this invention The top view of the light beam control member in Embodiment 2 of this invention Side view of light flux controlling member in Embodiment 2 of the present invention Front view of light flux controlling member in Embodiment 2 of the present invention The bottom view of the light beam control member in Embodiment 3 of this invention The top view of the light beam control member in Embodiment 3 of this invention Side view of light flux controlling member in Embodiment 3 of the present invention Front view of light flux controlling member in Embodiment 3 of the present invention The front view of the light beam control member which formed the notch in the bottom face in the 1st modification common in Embodiment 1- Embodiment 3. The bottom view of the light beam control member which formed the notch in the bottom face in the 1st modification common in Embodiment 1-Embodiment 3. The top view which expanded a part of illuminating device in the 2nd modification common in Embodiment 1- Embodiment 3. An image diagram showing an illuminance distribution in a lighting device having a wide pitch of a light beam control member in a light emitting device using a conventional light beam control member in which a rough surface portion is not formed. The image figure which shows the illumination intensity distribution in the illuminating device with a wide pitch of the light beam control member in the 2nd modification common to Embodiment 1-Embodiment 3.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
(Configuration of light emitting device)
Below, the structure of the light-emitting device 100 is demonstrated in detail using FIG.

  FIG. 1 is a cross-sectional view of a light emitting device 100 according to the present embodiment.

  The light emitting device 100 mainly includes a light flux controlling member 101 and a light emitting element 102.

  The light flux controlling member 101 is accommodated in a cylindrical holder 103 that is fixed to a substrate (not shown). The light flux controlling member 101 receives light emitted from the light emitting element 102 and controls the light distribution direction of the incident light, thereby controlling the traveling direction of the light.

  The light emitting element 102 is a light emitting diode, for example, and is a light source of the light emitting device 100. The light emitting element 102 is attached to a substrate (not shown) so that the optical axis coincides with the central axis P1 of the light flux controlling member 101.

(Configuration of luminous flux control member)
Hereinafter, the configuration of the light flux controlling member 101 will be described in detail with reference to FIGS. 1 and 2A to 2D.

  FIG. 2A is a bottom view of light flux controlling member 101 in the present embodiment. FIG. 2B is a plan view of light flux controlling member 101 in the present embodiment. FIG. 2C is a side view of light flux controlling member 101 in the present embodiment. FIG. 2D is a front view of light flux controlling member 101 in the present embodiment.

  The light flux controlling member 101 is mainly composed of an incident surface 110, a total reflection surface 112, an exit surface 113, a flange portion 114, and a bottom surface 115.

  That is, the light flux controlling member 101 includes a concave portion 111 formed on the light emitting element facing surface portion facing the light emitting element 102, an emission surface 113 formed on the opposite side of the light emitting element facing surface portion, and an outer peripheral end portion of the light emitting element facing surface portion. The total reflection surface 112 and the flange portion 114, which are side surfaces extending from the light emitting surface 113 toward the outer peripheral end portion, and the bottom surface 115 as a part of the light emitting element facing surface portion. In the present embodiment, the light emitting element facing surface portion is composed of a recess 111 and a bottom surface 115.

  The incident surface 110 is formed on the inner surface of the recess 111 formed by recessing the light emitting element facing surface portion facing the light emitting element 102, and is formed to be rotationally symmetric about the central axis P1. The incident surface 110 includes an inner top surface 110a as a first incident surface formed on the inner surface of the concave portion 111 so as to intersect the central axis P1, and a concave portion on the light emitting element 102 side from the outer peripheral end of the inner top surface 110a. And a tapered inner wall surface 110b serving as a second incident surface extending to the opening edge of 111. Here, the inner wall surface 110b has an inner diameter that gradually increases from the inner top surface 110a side toward the opening edge side of the recess 111.

  Total reflection surface 112 is an outer surface extending from the outer peripheral portion of bottom surface 115 to the lower surface of flange portion 114, and is a rotationally symmetric surface formed so as to surround central axis P1. The total reflection surface 112 is formed so as to gradually increase in diameter from the outer edge of the bottom surface 115 toward the flange portion 114, and the outer diameter gradually increases from the bottom surface 115 toward the flange portion 114. It has an arcuate curve convex toward the side away from the central axis P1. The total reflection surface 112 totally reflects the light incident from the inner wall surface 110 b toward the emission surface 113.

  The emission surface 113 is formed on the side opposite to the light emitting element 102 with respect to the light emitting element facing surface portion, and the shape projected on the plane is a circular shape having the center on the central axis P1. The exit surface 113 has an apex 116 at a predetermined position on the central axis P1, and smoothly inclines from the apex 116 toward the outer peripheral portion 117 of the exit surface 113 so as to gradually reduce the height from the bottom surface 115. In addition, the emission surface 113 is formed to be curved upward (in a direction away from the bottom surface 115) into a convex shape. Further, the emission surface 113 is formed such that a part of the outer peripheral end portion is rougher than the vicinity of the central axis P1. In addition, the exit surface 113 has a portion intersecting with an arbitrary cross section including the central axis P1 (hereinafter referred to as “first cross section” in the present embodiment) orthogonal to the first cross section and the central axis P1. Is formed so as to be rougher than a portion intersecting with a cross section including (in the present embodiment, hereinafter referred to as “second cross section”). Specifically, on the emission surface 113, emission surface rough surface portions 113a and 113b that are roughened so as to be rougher than other portions of the emission surface 113 are formed along the outer peripheral portion 117 connected to the flange portion 114. Is done. Therefore, the light exiting surface 113 has higher light diffusibility at a location where it intersects the first cross section than at a location where it intersects the second cross section. Thus, the light emitting device 100 having anisotropic diffusivity is formed.

  Here, the first cross section is a cross section obtained by cutting the light flux controlling member 101 along a one-dot chain line D1 in FIG. 2B. The second cross section is a cross section obtained by cutting the light flux controlling member 101 along a one-dot chain line D2 in FIG. 2B.

  A pair of emission surface rough surface portions 113 a and 113 b are formed in a band shape at the outer peripheral end portion of the emission surface 113. The exit surface rough surface portions 113a and 113b are formed on the exit surface 113 that intersects the first cross section. Further, the exit surface rough surface portions 113a and 113b are formed along the outer peripheral portion 117 in a range in which the intersection line between the first cross section and the exit surface 113 is rotated by a predetermined angle θ1 with the central axis P1 as the rotation axis ( (See FIG. 2B).

  The flange portion 114 is formed so as to protrude radially outward from the outer peripheral portion 117 of the emission surface 113 and has a substantially annular shape.

  The bottom surface 115 is a ring-shaped plane formed around the opening edge of the recess 111.

(Configuration of lighting device)
Below, the structure of the illuminating device 300 is demonstrated in detail using FIG. 3A-FIG. 3C and FIG.

  FIG. 3A is a front view of lighting apparatus 300 according to the present embodiment. FIG. 3B is a side sectional view of lighting apparatus 300 according to the present embodiment. 3C is a cross-sectional view taken along line XX of FIG. 3B. FIG. 4 is an enlarged plan view of a part of the lighting device 300. In addition, description of the holder 103 is abbreviate | omitted in FIG. 3A-FIG. 3C and FIG.

  The illumination device 300 is mainly composed of light emitting devices 100-1 to 100-12, a substrate 400, and an irradiated portion 301. Note that each of the light emitting devices 100-1 to 100-12 has the same configuration as the light emitting device 100 described in FIG.

  The light emitting devices 100-1 to 100-12 are respectively mounted on the substrate 400 so as to be arranged at a predetermined interval in a direction parallel to the X axis that is the longitudinal direction of the illumination device 300. Further, the light emitting devices 100-1 to 100-12 are arranged so that the first cross section and the irradiated surface 301a on the light incident side of the irradiated portion 301 and the opposed irradiated surface 301b are orthogonal to each other (FIG. 4). reference).

  The substrate 400 is disposed on the bottom surface of the lighting device 300.

  The irradiated portion 301 has a rectangular shape and includes an irradiated surface 301a and an opposed irradiated surface 301b that face each other. The irradiated surface 301 a and the opposed irradiated surface 301 b are the inner surfaces of the irradiated portion 301 of the illumination device 300.

  The irradiated surface 301a has a flat plate shape parallel to the XZ plane, and is a diffusion plate in the present embodiment. For example, the irradiated portion 301 has advertising characters or pictures drawn on the outer surface, and is illuminated from the inside by the light emitting devices 100-1 to 100-12. In addition, the irradiated surface 301a is such that light emitted from the light emitting devices 100-1 to 100-12 having a small angle with respect to the optical axis is emitted from the light emitting devices 100-1 to 100-12 having a large angle with respect to the optical axis. The incident angle is increased.

  The opposed irradiated surface 301b is a plane that faces the irradiated surface 301a and is parallel to the irradiated surface 301a and the XZ plane. Further, in the opposed irradiated surface 301b, the light emitted from the light emitting devices 100-1 to 100-12 having a small angle with respect to the optical axis is larger than the light emitted from the light emitting devices 100-1 to 100-12 having a large angle with respect to the optical axis. Are arranged so that the incident angle becomes large.

  In the lighting device 300 having the above-described configuration, the mounting surface of the light emitting element 102 of the substrate 400 is disposed on the XY plane, and the twelve light emitting devices 100-1 to 100-12 are arranged on the X axis at a 50 mm pitch (in FIG. 3A). (Distance H = 50 mm). Between the sixth light emitting device 100-6 and the seventh light emitting device 100-7, the origin O where the X axis, the Y axis, and the Z axis intersect perpendicularly is located on the substrate 400. One side of the irradiated surface 301a and the opposite irradiated surface 301b is arranged on the XY plane, and is arranged in parallel at a position of ± 40 mm (distance E = 80 mm in FIG. 3B) in the Y-axis direction from the XZ plane. The size of the irradiated portion 301 having the irradiated surface 301a and the opposed irradiated surface 301b is 650 mm (distance A in FIG. 3A) in the X-axis direction and 520 mm (distance C in FIG. 3A) in the Z-axis direction. The effective light emitting area (distance B × distance D = 570 mm × 440 mm in FIG. 3A) is a range of 285 mm left and right and 220 mm up and down from the center of the irradiated portion 301 in FIG. 3A.

  Moreover, in the illuminating device 300, the exit surface rough surface portions 113a and 113b diffuse light that causes a specific bright portion in the irradiated portion 301. In addition, the exit surface rough surface portions 113a and 113b are formed in a region where light quantity is likely to be insufficient in the vicinity of the light emitting element 102 in the irradiated portion of the illumination device including the light beam control member that does not form the exit surface rough surface portions 113a and 113b. In order to diffuse and distribute the light, it is formed on a part of the emission surface 113 from which light that causes a specific bright portion is emitted. That is, the exit surface rough surface portions 113a and 113b having a function of distributing light may be formed in the vicinity of the outer peripheral portion 117 so as not to affect the light emitted from the vicinity of the central axis P1 of the output surface 113. It may be formed so as to extend over the flange 114 on the radially outer side from the portion 117. Further, a slight gap may be formed between the outer peripheral portion 117 and the exit surface rough surface portions 113a and 113b. Here, the bright part specific to the irradiated portion 301 means that the emitted light from the light beam control member 101 that is emitted in a small angle range with respect to the central axis P1 (emitted light with a narrow orientation angle) is emitted to the irradiated portion 301. This is a boundary portion between the reaching area and the insufficient light quantity area in the vicinity of the light emitting devices 100-1 to 100-12.

  In general, in spot illumination in which the light distribution of the light emitted from the light emitting element 102 is narrowed to increase the light intensity in a small angle range with respect to the optical axis, the irradiation area is narrowed when the irradiated portion 301 is irradiated. As a result, light rays are collected in a narrow range with a small angle range from the optical axis, so that the illuminance of the irradiated surface 301a and the counter-irradiated surface 301b at a position away from the light emitting element 102 can be increased, but the light emitting element 102 The light rays for irradiating the vicinity of are insufficient. As a result, the illuminance in the vicinity of the light emitting element 102 in the irradiated portion 301 decreases, and the run-up distance becomes longer.

  However, in the present embodiment, a part of the exit surface 113 (outgoing surface rough surface portions 113a and 113b) of the light flux controlling member 101 is roughened, so that the light emitted from the light flux controlling member 101 is roughened. It diffuses by passing through the surface portions 113a and 113b. Accordingly, the diffused light emitted from the exit surface rough surface portions 113a and 113b also reaches the vicinity of the light emitting element 102 on the irradiated surface 301a and the opposed irradiated surface 301b, so that the dark portion in the vicinity of the light emitting element 102 is relaxed. And the run-up distance can be shortened. Further, by shortening the running distance, it is possible to narrow the frame portions (regions other than the effective light emitting region in the irradiated portion 301) on the irradiated surface 301a and the opposed irradiated surface 301b. Further, in order to minimize the decrease in illuminance of the irradiated surface 301a and the counter-irradiated surface 301b at a position away from the light emitting element 102, the central portion (near the central axis P1) of the emission surface 113 is not roughened. . For this reason, it is possible to make the brightness uniform on the outer surface (the light emitting surface of the lighting device 300) in a wide range of the irradiated portion 301 from the vicinity of the light emitting element 102 to a position away from it.

  In addition, although the illuminating device 300 shown to FIG. 3A-FIG. 3C and FIG. 4 was set as the illumination for internal illumination which irradiates the to-be-irradiated part 301 from an inside, this invention is not limited to this, It emits light directly to the to-be-irradiated surface 301a. It is good also as illumination for external lighting which irradiates the light from the apparatus 100. FIG. In the case of external illumination, only one irradiated surface 301a is arranged as an irradiated portion, and a surface on which characters or pictures are drawn on the irradiated surface 301a is set as the light emitting devices 100-1 to 100-. Illuminate by 12. In this case, the exit surface rough surface portion 113a may be formed only on the irradiated surface 301a side. Such external illumination can make the brightness of the irradiated surface 301a uniform by the light emitting device 100 according to this embodiment.

(Illuminance distribution of the irradiated part in the lighting device)
Illuminance distribution in the lighting device 300 will be described with reference to FIGS. 5 and 6.

  FIG. 5 is an image diagram showing the brightness distribution on the irradiated surface (the light emitting surface located outside the irradiated portion) by the conventional light emitting device as an illuminance distribution. In addition, FIG. 6 shows the illuminance on the light emitting surface located outside the irradiated portion 301 on the irradiated surface 301a side of the illumination device 300 using the light emitting device 100 on which the exit surface rough surface portions 113a and 113b of the present embodiment are formed. It is an image figure which shows distribution. As described above, the light emitting device 100 in the illumination device 300 according to the present embodiment is arranged so that the first cross section intersecting with the exit surface rough surface portions 113a and 113b is orthogonal to the irradiated portion 301.

  5 and 6, the dark region generation region S2 in the vicinity of the light emitting device 100 in FIG. 6 is smaller than the dark region generation region S1 in the vicinity of the conventional light emitting device in FIG. 5 (S1> S2). Therefore, in the illumination device 300 of the present embodiment, the illuminance in the vicinity of the light emitting device 100 is improved as compared with the illumination device using the conventional light emitting device. 7 is a diagram showing the illuminance distribution on the boundary line # 401 shown in FIG. 5 and the illuminance distribution at the same position # 501 as the boundary line # 401 of FIG. 5 shown in FIG. In FIG. 7, the illuminance distribution on the boundary line # 401 of the dark area S1 in the conventional illumination device shown in FIG. 5 is indicated by a broken line, and the conventional illumination device of the illumination device 300 of the present embodiment shown in FIG. The illuminance distribution at the same position # 501 is indicated by a solid line. As is apparent from FIG. 7, in the illumination device according to the present embodiment, the light reaching the specific bright part in the conventional illumination device is dispersed to other parts, and the illuminance is made uniform.

(Effect of this embodiment)
As described above, in the present embodiment, the diffused light is emitted anisotropically while appropriately maintaining the emission characteristic of the narrow orientation angle in the light emitting device for spot illumination. Further, in the present embodiment, an exit surface rough surface portion for emitting diffused light that irradiates the vicinity of the light source of the irradiated surface is formed on a part of the exit surface of the light flux controlling member that emits light with a narrow light distribution. Provided to emit light with a good balance between the light traveling toward the irradiated surface relatively far from the light source and the light traveling toward the irradiated surface near the light source. Thus, according to the present embodiment, the illuminance in the vicinity of the light source on the irradiated surface can be increased, so that unevenness in illuminance can be suppressed, the entire irradiated surface can be irradiated more uniformly, and the running distance Can be shortened.

  Further, according to the present embodiment, when the illumination device is an internal illumination that irradiates the irradiated surface from the inside, the frame portion on the irradiated surface can be narrowed, so that the picture or The degree of freedom of the space for writing characters and the like can be increased.

  Further, in the present embodiment, when the illumination device is an external illumination that irradiates the irradiated surface from the outside, the illuminance unevenness is suppressed, and a region where the picture, characters, etc. on the irradiated surface can be sufficiently visually recognized The distance from the light source in the Z direction in FIG. 3 is shortened. Thereby, according to this Embodiment, an illuminating device can be reduced in size and the arrangement space of an illuminating device can be made small.

  In this embodiment, a part of the exit surface of the light flux controlling member is roughened to form a rough surface part. However, the present invention is not limited to this, and a roughened sheet is attached to a part of the exit surface. A rough surface portion may be formed by attaching. Moreover, you may provide a gradation in the rough surface degree of a rough surface part. Examples of the roughening method include a method in which a die is subjected to etching processing, electric discharge processing, blasting or the like, and transferred to the surface of the light flux controlling member by molding.

(Embodiment 2)
(Configuration of luminous flux control member)
Hereinafter, the configuration of light flux controlling member 600 in the present embodiment will be described in detail with reference to FIG. FIG. 8A is a bottom view of light flux controlling member 600 in the present embodiment. FIG. 8B is a plan view of light flux controlling member 600 in the present embodiment. FIG. 8C is a side view of light flux controlling member 600 in the present embodiment. FIG. 8D is a front view of light flux controlling member 600 in the present embodiment.

  8A to 8D, parts having the same configuration as in FIGS. 2A to 2D are denoted by the same reference numerals, and detailed description thereof is omitted. The light emitting device according to the present embodiment has the same configuration as that of FIG. 1 except that the light beam control member 600 is used in place of the light beam control member 101, and thus the description thereof is omitted.

  The light flux controlling member 600 is mainly composed of an incident surface 110, a flange 114, a bottom surface 115, an exit surface 601, and a total reflection surface 602.

  The emission surface 601 is a circular shape whose shape projected on a plane has a center on the central axis P1. In addition, the emission surface 601 has a vertex 116 at a predetermined position of the central axis P1, and smoothly inclines from the vertex 116 toward the outer peripheral portion 117 of the emission surface 601 so as to gradually reduce the height from the bottom surface 115. In addition, the emission surface 601 is formed to be curved upward (in a direction away from the bottom surface 115) into a convex shape.

  Total reflection surface 602 is an outer surface extending from the outer peripheral portion of bottom surface 115 to the lower surface of flange portion 114, and is a rotationally symmetric surface formed so as to surround central axis P1. The total reflection surface 602 is formed so as to gradually increase in diameter from the outer edge of the bottom surface 115 toward the flange portion 114, and the outer diameter gradually increases from the bottom surface 115 toward the flange portion 114. It has an arcuate curve convex toward the side away from the central axis P1. The total reflection surface 602 totally reflects the light incident from the inner wall surface 110 b toward the emission surface 601. Further, total reflection surface 602 includes a central axis P1 at a location where it intersects an arbitrary cross section including central axis P1 (hereinafter referred to as “first cross section” in the present embodiment), and first It is formed so as to have higher light diffusibility than a portion that intersects a cross section orthogonal to the cross section (hereinafter referred to as “second cross section” in the present embodiment). That is, the total reflection surface 602 is roughened so that the portion that intersects the first cross section is rougher than the portion that intersects the second cross section. Specifically, the total reflection surface 602 is rough so as to be rougher than the other portions from the connection portion with the bottom surface 115 to the connection portion with the flange portion 114 at a location where the first cross section intersects. Surfaceized total reflection surface rough surface portions 602a and 602b are formed. Therefore, in the total reflection surface 602, the light diffusibility is higher at the location where the first cross section intersects with the location where the second cross section intersects.

  Here, the first cross section is a cross section obtained by cutting the light flux controlling member 600 along a one-dot chain line D1 in FIG. 8B. The second cross section is a cross section obtained by cutting the light flux controlling member 600 along a one-dot chain line D2 in FIG. 8B.

  The total reflection surface rough surface portions 602 a and 602 b are formed as a pair on the total reflection surface 602. The total reflection surface rough surface portions 602a and 602b are, from the bottom surface 115 side toward the flange portion 114 side, a cross section parallel to the bottom surface 115 and the length of the arc-shaped intersection line between the total reflection surface rough surface portions 602a and 602b. Is formed so as to gradually increase (see FIG. 8A).

  The flange portion 114 is formed to protrude radially outward from the outer peripheral portion 117 of the emission surface 601 and has a substantially annular shape.

(Configuration of lighting device)
In the illuminating device according to the present embodiment, light flux controlling member 600 is used similarly to light flux controlling member 101 of light emitting device 100 of lighting device 300 shown in FIGS. 3A to 3C. Further, in the lighting device according to the present embodiment, as in FIGS. 3A to 3C, each of the pair of rough surface portions 602a and 602b is arranged to be on the irradiated surface 301a side and the opposite irradiated surface 301b side. The Note that the illumination device according to the present embodiment has the same configuration as that of FIGS. 3A to 3C except that the light beam control member 600 is used instead of the light beam control member 101, and thus detailed description thereof is omitted and the following description is omitted. In description, it demonstrates using the reference number of FIG. 3A-FIG. 3C.

  In lighting device 300 according to the present embodiment, total reflection surface rough surface portions 602a and 602b diffuse light that causes specific bright portions in irradiated portion 301. In addition, the total reflection surface rough surface portions 602a and 602b are regions that are likely to have insufficient light quantity in the vicinity of the light emitting element 102 in the irradiated portion of the illumination device including the light flux control member that does not form the total reflection surface rough surface portions 602a and 602b. In order to diffuse and distribute the light, it is formed on a part of the total reflection surface 602 where the light that causes it is reflected. In addition, the light flux controlling member 600 is disposed so that the first cross section and the irradiated surface 301a and the opposite irradiated surface 301b on the light incident side of the irradiated portion 301 are orthogonal to each other. Here, the bright part specific to the irradiated part 301 is the light emitted from the light flux controlling member 600 that is emitted in a small angle range with respect to the central axis P1 (the emitted light having a narrow orientation angle). This is a boundary portion between the reaching area and the insufficient light quantity area in the vicinity of the light emitting device.

  Incidentally, in the light flux controlling member 600 in the present embodiment, all of the light emitted from the light emitting element 102 is controlled so as to narrow the light distribution after entering light having a large angle with respect to the optical axis into the lens. It is essential to provide the reflective surface 602. For this reason, in the total reflection surface 602, when the region where the total reflection surface rough surface portions 602a and 602b are provided is larger than necessary, the light irradiated on the irradiated surface far from the light source is reduced, and the entire irradiated surface is Cannot be illuminated uniformly. Therefore, in the total reflection surface 602, by appropriately controlling the size of the region where the total reflection surface rough surface portions 602a and 602b are provided, the irradiated surface or the opposite irradiated surface is uniformly irradiated.

(Effect of this embodiment)
Thus, in this embodiment, a total reflection surface rough surface portion for emitting diffused light that irradiates the vicinity of the light source is provided on a part of the total reflection surface of the light flux controlling member that emits light with a narrow light distribution. Provided to emit light with a good balance between the light traveling toward the irradiated surface relatively far from the light source and the light traveling toward the irradiated surface near the light source. Thereby, according to this Embodiment, the illumination intensity of the light source vicinity can be made high, an illumination intensity nonuniformity can be suppressed, the whole to-be-irradiated surface can be irradiated more uniformly, and a run-up distance can be shortened.

  Further, according to the present embodiment, when the illumination device is an internal illumination that irradiates the irradiated surface from the inside, the frame portion on the irradiated surface can be narrowed, so that the picture or The degree of freedom of the space for writing characters and the like can be increased.

  Further, in the present embodiment, when the illumination device is an external illumination that irradiates the irradiated surface from the outside, the illuminance unevenness is suppressed, and a region where the picture, characters, etc. on the irradiated surface can be sufficiently visually recognized The distance from the light source in the Z direction in FIG. 3 is shortened. Thereby, according to this Embodiment, an illuminating device can be reduced in size and the arrangement space of an illuminating device can be made small.

  Further, according to the present embodiment, since the rough surface portion is formed on a part of the total reflection surface, the light emitted from the total reflection surface that does not form the rough surface portion is used to illuminate the irradiated surface or the opposite irradiated surface. It is possible to irradiate a portion away from the center with an appropriate amount of light.

  In addition, according to the present embodiment, the light flux controlling member does not diffuse the light that directly enters the incident surface and reaches the output surface, and thus suppresses the decrease in the light that irradiates the irradiated surface far from the light source. Can do.

(Modification of this embodiment)
In this embodiment, a part of the total reflection surface of the light flux controlling member is roughened to form a rough surface part. However, the present invention is not limited to this, and the roughened sheet is a part of the total reflection surface. The rough surface portion may be formed by pasting to the surface. Moreover, you may provide a gradation in the rough surface degree of a rough surface part. Examples of the roughening method include a method in which a die is subjected to etching processing, electric discharge processing, blasting or the like, and transferred to the surface of the light flux controlling member by molding.

(Embodiment 3)
(Configuration of luminous flux control member)
Hereinafter, the configuration of light flux controlling member 700 in the present embodiment will be described in detail with reference to FIG. FIG. 9A is a bottom view of light flux controlling member 700 in the present embodiment. FIG. 9B is a plan view of light flux controlling member 700 in the present embodiment. FIG. 9C is a side view of light flux controlling member 700 in the present embodiment. FIG. 9D is a front view of light flux controlling member 700 in the present embodiment.

  9A to 9D, parts having the same configuration as in FIGS. 2A to 2D are denoted by the same reference numerals, and description thereof is omitted. The light-emitting device according to the present embodiment has the same configuration as that of FIG. 1 except that a light beam control member 700 is used instead of the light beam control member 101, and thus the description thereof is omitted.

  The light flux controlling member 700 mainly includes an incident surface 110, a flange 114, a bottom surface 115, an exit surface 701, and a total reflection surface 702.

  The emission surface 701 is a circular shape whose shape projected on a plane has a center on the central axis P1. Further, the emission surface 701 has a vertex 116 at a predetermined position of the central axis P1, and smoothly inclines from the vertex 116 toward the outer peripheral portion 117 of the emission surface 701 so as to gradually reduce the height from the bottom surface 115. In addition, the emission surface 701 is formed so as to be curved in a convex shape upward (in a direction away from the bottom surface 115).

  Total reflection surface 702 is an outer surface extending from the outer peripheral portion of bottom surface 115 to the lower surface of flange 114, and is a rotationally symmetric surface formed so as to surround central axis P1. The total reflection surface 702 is formed so as to gradually increase in diameter from the outer edge of the bottom surface 115 toward the emission surface 701, and the outer diameter gradually increases from the bottom surface 115 toward the flange portion 114. It has an arcuate curve convex toward the side away from the central axis P1. The total reflection surface 702 totally reflects the light incident from the inner wall surface 110 b toward the emission surface 701. Further, total reflection surface 702 includes a central axis P1 at a location where it intersects with an arbitrary cross section including the central axis P1 (hereinafter referred to as “first cross section” in the present embodiment), and the first It is formed so as to have higher light diffusibility than a portion that intersects a cross section orthogonal to the cross section (hereinafter referred to as “second cross section” in the present embodiment). The total reflection surface 702 is formed so that the light diffusibility is higher on the emission surface 701 side than on the bottom surface 115 side. In other words, the total reflection surface 702 is roughened so that the exit surface 701 side where the first cross section intersects is rougher than the bottom surface 115 side where the second cross section intersects with the first cross section. Has been. Specifically, the total reflection surface 702 is roughened so as to be rougher than the other portions in a portion crossing the first cross section from the connection portion with the flange portion 114 to the middle of the bottom surface 115. Thus, the total reflection surface rough surface portions 702a and 702b are formed. Therefore, the total reflection surface 702 has higher light diffusibility on the exit surface 701 side where the first cross section intersects than on the bottom surface 115 side where the second cross section intersects with the first cross section.

  Here, the first cross section is a cross section obtained by cutting light flux controlling member 700 along one-dot chain line D1 in FIG. 9B. The second cross section is a cross section obtained by cutting the light flux controlling member 700 along a one-dot chain line D2 in FIG. 9B.

  The total reflection surface rough surface portions 702a and 702b are formed as a pair on the total reflection surface 702. Further, the total reflection surface rough surface portions 702a and 702b are within a range in which the intersection line between the first cross section and the total reflection surface 702 is rotated by a predetermined angle θ3 with the central axis P1 as the rotation axis. It is formed along the boundary between the flange portion 114 and the flange portion 114. For example, the total reflection rough surface portions 702a and 702b are provided in an upper half region between the bottom surface 115 and the flange portion 114 within a predetermined angle θ3 and on the flange portion 114 side.

  The flange portion 114 is formed to protrude radially outward from the outer peripheral portion 117 of the emission surface 701 and has a substantially annular shape.

(Configuration of lighting device)
In the illuminating device according to the present embodiment, light flux controlling member 700 is used similarly to light flux controlling member 101 of light emitting device 100 of lighting device 300 shown in FIG. Further, in the lighting device according to this embodiment, as in FIG. 3, the light emitting device is arranged so that each of the pair of rough surface portions 702a and 702b is on the irradiated surface 301a side and the opposite irradiated surface 301b side. . Since the configuration is the same as that of FIG. 3 except that the light flux control member 700 is used instead of the light flux control member 101, detailed description thereof will be omitted, and in the following description, description will be made using the reference numerals of FIG. To do.

  In lighting device 300 according to the present embodiment, total reflection surface rough surface portions 702a and 702b diffuse light that causes specific bright portions in irradiated portion 301. In addition, the total reflection surface rough surface portions 702a and 702b are regions that are prone to insufficient light quantity in the vicinity of the light emitting element 102 in the irradiated portion of the illumination device including the light beam control member that does not form the total reflection surface rough surface portions 702a and 702b. In order to diffuse and distribute the light, it is formed on a part of the total reflection surface 702 where the light that causes it is reflected. Further, the light flux controlling member 700 is arranged so that the first cross section and the irradiated surface 301 a and the opposite irradiated surface 301 b which are the light incident side of the irradiated portion 301 are orthogonal to each other. Here, the bright part specific to the irradiated part 301 is the light emitted from the light flux controlling member 700 that is emitted in a small angle range with respect to the central axis P1 (the emitted light having a narrow light distribution angle). This is the boundary between the region that reaches the point and the region where the light amount is insufficient in the vicinity of the light emitting device.

  Incidentally, in the light flux controlling member 700 in the present embodiment, all of the light emitted from the light emitting element 102 is controlled so as to narrow the light distribution after entering light having a large angle with respect to the optical axis into the lens. It is essential to provide the reflective surface 702. For this reason, in the total reflection surface 702, when the region where the total reflection surface rough surface portions 702a and 702b are provided is larger than necessary, the light irradiated on the irradiated surface far from the light source is reduced, and the entire irradiated surface is Cannot be illuminated uniformly. Therefore, in the total reflection surface 702, by appropriately controlling the size of the region where the total reflection surface rough surface portions 702a and 702b are provided, the irradiated surface or the opposite irradiated surface is uniformly irradiated.

(Effect of this embodiment)
Thus, in this embodiment, a total reflection surface rough surface portion for emitting diffused light that irradiates the vicinity of the light source is provided on a part of the total reflection surface of the light flux controlling member that emits light with a narrow light distribution. Provided to emit light with a good balance between the light traveling toward the irradiated surface relatively far from the light source and the light traveling toward the irradiated surface near the light source. Thereby, according to this Embodiment, the illumination intensity of the light source vicinity can be made high, an illumination intensity nonuniformity can be suppressed, the whole to-be-irradiated surface can be irradiated more uniformly, and a run-up distance can be shortened.

  Further, according to the present embodiment, when the illumination device is an internal illumination that irradiates the irradiated surface from the inside, the frame portion on the irradiated surface can be narrowed, so that the picture or The degree of freedom of the space for writing characters and the like can be increased.

  Further, in the present embodiment, when the illumination device is an external illumination that irradiates the irradiated surface from the outside, the illuminance unevenness is suppressed, and a region where the picture, characters, etc. on the irradiated surface can be sufficiently visually recognized The distance from the light source in the Z direction in FIG. 3 is shortened. Thereby, according to this Embodiment, an illuminating device can be reduced in size and the arrangement space of an illuminating device can be made small.

  Further, according to the present embodiment, since the rough surface portion is formed on a part of the total reflection surface, the light emitted from the total reflection surface that does not form the rough surface portion is used to illuminate the irradiated surface or the opposite irradiated surface. It is possible to irradiate a portion away from the center with an appropriate amount of light.

  In addition, according to the present embodiment, the light flux controlling member does not diffuse the light that directly enters the incident surface and reaches the output surface, and thus suppresses the decrease in the light that irradiates the irradiated surface far from the light source. Can do.

(Modification of this embodiment)
In this embodiment, a part of the total reflection surface of the light flux controlling member is roughened to form a rough surface part. However, the present invention is not limited to this, and the roughened sheet is a part of the total reflection surface. The rough surface portion may be formed by pasting to the surface. Moreover, you may provide a gradation in the rough surface degree of a rough surface part. Examples of the roughening method include a method in which a die is subjected to etching processing, electric discharge processing, blasting or the like, and transferred to the surface of the light flux controlling member by molding.

(First modification common to the first to third embodiments)
In the first to third embodiments described above, a notch may be formed in the bottom surface 115 of the light flux controlling members 101, 600, and 700.

  FIG. 10A is a front view of light flux controlling member 800 in which notch 801 is formed in bottom surface 115. FIG. 10B is a bottom view of the light flux controlling member 800 in which a notch 801 is formed in the bottom surface 115. 10A and 10B, the light flux controlling member 800 is the same as the light flux controlling member 101 in FIG. 2, the light flux controlling member 600 in FIG. 8, or the light flux controlling member 700 in FIG. 9 except that a notch 801 is formed. It is a configuration. 10A and 10B, the description of the rough surface portion is omitted.

  As shown in FIG. 10B, a pair of notches 801 are formed on the bottom surface 115.

  10A and 10B, the light flux controlling member 800 is arranged so that the pair of notches 801 are opposed to the irradiated surface 301a and the opposed irradiated surface 301b, respectively.

(Second modification common to the first to third embodiments)
In the illumination device 300 according to the first to third embodiments, the first cross sections of the light flux controlling members 101, 600, and 700 are orthogonal to the irradiated portion 301 (outgoing surface rough surface portion 113a, total reflection). The light flux controlling members 101, 600, and 700 are arranged such that the rough surface portion 602a and the total reflection surface rough surface portion 702a face the irradiated portion 301 side. However, the present invention is not limited to this, and the light flux controlling members 100, 600, and 700 may be arranged so that the first cross section is parallel to the irradiated portion 301.

  FIG. 11 is an enlarged plan view of a part of the illumination device according to this modification. FIG. 12 is an image diagram showing an illuminance distribution in a lighting device having a wide light flux control member pitch in a light emitting device using a conventional light flux control member in which a rough surface portion is not formed. FIG. 13 is an image diagram showing an illuminance distribution in an illumination device having a wide pitch of light flux controlling members in the present modification. In addition, in the light-emitting device and illuminating device in this modification, it is the same structure as FIGS. 1-3, FIG. 8, FIG. 9, or FIG. 10 except changing the arrangement | positioning at the time of mounting to the illuminating device 300 of the light-emitting device 100. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

  For example, in a light emitting device using a conventional light flux control member in which a rough surface portion is not formed, in a lighting device having a wide light flux control member pitch, positions corresponding to light emitting devices on the irradiated surface 301a as shown in FIG. Dark portions r1 to r7 are generated in the area. On the other hand, the arrangement of the light flux controlling member 101-1 according to the present modification is suitable for suppressing dark portions that occur between the pitches of the light emitting devices. That is, in the light flux controlling member 101-1 according to this modification, the light diffused through the exit surface rough surface portion 113a or the total reflection surface rough surface portions 602a and 702a is likely to be insufficient in light quantity between the light emitting devices on the irradiated surface 301a. It is also distributed to the area. As a result, in this modification, the illuminance distribution on the entire irradiated surface 301a can be made uniform as shown in FIG.

(Third Modification Common to Embodiments 1 to 3)
In the first to third embodiments, the opposed irradiated surface and the opposed irradiated surface are illuminated by the light emitting device. However, the present invention is not limited to this, and one illuminated surface is illuminated by the light emitting device. May be. In this case, the illuminance of the irradiated surface can be increased by providing a reflector on the opposite irradiated surface facing the illuminated surface to be illuminated.

  Moreover, in said Embodiment 1- Embodiment 3, it is not restricted to the case where an emitted light is spread | diffused only using the rough surface part demonstrated in each embodiment, Each embodiment is combined suitably, and several different A rough surface portion may be formed at the location, and the emitted light from each location may be diffused.

  Further, in the above first to third embodiments, the example in which the irradiated surface and the opposed irradiated surface that are opposed to each other are illuminated by the light emitting device is shown. The irradiated surface may be illuminated. In this case, it is not necessary to form a pair of rough surface portions, and only the position corresponding to the irradiated surface may be the rough surface portion.

  In the above first to third embodiments, one of the opposed irradiated surface and the opposed irradiated surface may be a reflecting surface and the other may be a light transmitting surface. In that case, a rough surface portion may be appropriately formed in both or one of the positions corresponding to the irradiated surface and the opposite irradiated surface, depending on the illuminance distribution on the light emitting surface side of the light transmitting surface.

  The light emitting device and the lighting device according to the present invention and the light flux controlling member used for them are particularly suitable for illuminating a plate surface, a ceiling, a wall surface, a floor surface or a signboard.

DESCRIPTION OF SYMBOLS 100 Light-emitting device 101 Light-beam control member 102 Light-emitting element 103 Holder 110 Incident surface 110a Inner top surface 110b Inner wall surface 111 Recessed part 112 Total reflection surface 113 Outgoing surface 114 Grow part 115 Bottom surface 116 Vertex 117 Outer peripheral part 113a, 113b Outer surface rough surface part

Claims (7)

Is disposed facing the light emitting element, a light emitting element facing surface having a recess formed in order to enter the light flux controlling member of the light from the light emitting element,
An emission surface formed on a side opposite to the light emitting element with respect to the light emitting element facing surface portion;
A total reflection surface extending from an outer peripheral end portion of the light emitting element facing surface portion toward an outer peripheral end portion of the emission surface;
With
The recess is
A first incident surface formed to intersect the central axis;
A second incident surface extending from an outer peripheral end of the first incident surface toward the light emitting element,
Have
The total reflection surface is
The light incident on the second incident surface is formed so as to gradually increase in diameter from the light emitting element facing surface portion side toward the light emitting surface side so as to be totally reflected toward the light emitting surface.
The exit surface is
Light diffusibility is higher at the outer peripheral end than in the vicinity of the central axis, and a portion intersecting with an arbitrary first cross section including the central axis includes the central axis and is perpendicular to the first cross section. A light flux controlling member in which a rough surface portion is formed so as to have higher light diffusibility than a portion intersecting with a cross section. A light-emitting device comprising: a light-emitting element; and a light beam control member that receives light emitted from the light-emitting element and controls a traveling direction of the incident light.
The light emitting device
The light flux controlling member and the light emitting element are arranged so that the central axis of the light flux controlling member matches the optical axis of the light emitting element,
The light flux controlling member is
A light-emitting element facing surface portion that is disposed to face the light-emitting element and has a recess for allowing light from the light-emitting element to enter the light flux controlling member;
An emission surface formed on a side opposite to the light emitting element with respect to the light emitting element facing surface portion;
A total reflection surface extending from an outer peripheral end portion of the light emitting element facing surface portion toward an outer peripheral end portion of the emission surface;
With
The recess is
A first incident surface formed to intersect the central axis;
A second incident surface extending from an outer peripheral end of the first incident surface toward the light emitting element,
Have
The total reflection surface is
The light incident on the second incident surface is formed so as to gradually increase in diameter from the light emitting element facing surface portion side toward the light emitting surface side so as to be totally reflected toward the light emitting surface.
The exit surface is
Light diffusibility is higher at the outer peripheral end than in the vicinity of the central axis, and a portion intersecting with an arbitrary first cross section including the central axis includes the central axis and is perpendicular to the first cross section. A light emitting device in which a rough surface portion is formed so as to have higher light diffusibility than a portion intersecting with a cross section. A light-emitting device comprising: a light-emitting element; and a light beam control member that receives light emitted from the light-emitting element and controls a traveling direction of the incident light.
The light emitting device
The light flux controlling member and the light emitting element are arranged so that the central axis of the light flux controlling member matches the optical axis of the light emitting element,
The light flux controlling member is
A light-emitting element facing surface portion that is disposed to face the light-emitting element and has a recess for allowing light from the light-emitting element to enter the light flux controlling member;
An emission surface formed on a side opposite to the light emitting element with respect to the light emitting element facing surface portion;
A total reflection surface extending from an outer peripheral end portion of the light emitting element facing surface portion toward an outer peripheral end portion of the emission surface;
With
The recess is
A first incident surface formed to intersect the central axis;
A second incident surface extending from an outer peripheral end of the first incident surface toward the light emitting element,
Have
The total reflection surface is
The light incident on the second incident surface is formed so as to gradually increase in diameter from the light emitting element facing surface side toward the light emitting surface side so as to be totally reflected toward the light emitting surface, and the central axis is Light emission in which a rough surface portion is formed so that light diffusivity is higher in a portion intersecting with an arbitrary first cross section including a central section and intersecting with a second cross section perpendicular to the first cross section. apparatus.   The light-emitting device according to claim 3, wherein the rough surface portion is formed at a location that intersects the first cross section of the total reflection surface.   4. The light emitting device according to claim 3, wherein the rough surface portion is formed so that light diffusibility is higher on the emission surface side than on the light emitting element facing surface portion side at a location where the first cross section of the total reflection surface intersects. . A light emitting device according to any one of claims 2 to 5,
An irradiated surface irradiated by the light emitting device;
Have
An illumination device in which the light emitting device is arranged so that the first cross section of the light emitting device is orthogonal to the irradiated surface. A light emitting device according to any one of claims 2 to 5,
An irradiated surface irradiated by the light emitting device;
Have
An illumination device in which the light emitting device is arranged so that the first cross section of the light emitting device is parallel to the irradiated surface.

Images