JP2011222380A - Luminous flux control member, light emitting device, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminous flux control member, capable of lighting a surface to be irradiated at high quality, and capable of reducing the weight of a lighting device, by using a light emitting element as a light source.SOLUTION: The luminous flux control member 11 includes an incident surface 17, a total reflection surface part 16b, a first emission surface part 15a, a second emission surface part 15b, and a concave part 16a. The total reflection surface part 16b causes the light constituting a luminous flux to be totally reflected so that a solid angle of the luminous flux from a light emitting element 10 incident from the incident surface 17 is narrowed. The concave part 16a causes the light near an optical axis L1 to be totally reflected in a direction away from the optical axis L1. The first emission surface part 15a mainly causes the light totally reflected by the total reflection surface part 16b to be emitted toward a direction away from the optical axis L1. The second emission surface part 15b causes at least part of the light to be deflected and emitted toward a direction allowing the lighting of the surface to be irradiated, wherein the part of the light is the light supposed to be incapable of lighting the surface to be irradiated if it is assumed that all of a light control emission surface 15 is constituted of the first emission surface part 15a.

Description

The present invention relates to a light-emitting device that emits light from a light-emitting element (for example, an LED) through a light flux control member, an illumination device that illuminates a member to be illuminated (for example, an advertising panel) from the back side with the light-emitting device, and The present invention relates to a light flux controlling member constituting the light emitting device and the lighting device.

An illumination device that illuminates a light-transmitted member such as an advertising panel from the back side has been known to use a fluorescent lamp as a light source. However, in recent years, it consumes less power and has a longer life than a fluorescent lamp. A light-emitting element (for example, LED) has been developed as a light source.

FIG. 19 shows an illumination device 101 using such a light emitting element 100 as a light source. In the illuminating device 101 shown in FIG. 19, a pair of light guide plates 104 is arranged inside a pair of housings 103 arranged so that the illuminated members 102 face each other, and the light emitting elements 100 arranged on the side surfaces of the respective light guide plates 104. Is incident on the inside of the light guide plate 104, and the light guide plate 104
The light that has entered the inside of the light source is emitted in a planar shape from the light emission surface of the light guide plate 104 facing the member to be illuminated 102, and the light to be illuminated 102 is illuminated from the back side with the light emitted from the light guide plate 104. (See Patent Document 1).

JP 2002-40261 A

However, the illumination device 101 as shown in FIG. 19 can reduce power consumption and extend the life of the light source as compared with the case where a fluorescent lamp is used as a light source. In order to uniformly illuminate the entire surface of the member 102, the light guide plate 104 having almost the same area as that of the member to be illuminated 102 has to be used, resulting in a problem that the overall weight becomes too heavy.

Therefore, the present invention can illuminate the irradiated surface with high quality, and includes a lightweight illuminating device that uses a light emitting element as a light source, a light emitting device that constitutes the illuminating device, and a light flux control member that constitutes the light emitting device. For the purpose of provision.

As shown in FIGS. 1 to 4 and FIGS. 11 to 14, the invention according to claim 1 is disposed together with a light emitting element (for example, LED) 10 on the end side of the illuminated member 3, and emits light from the light emitting element 10. The present invention relates to light flux controlling members 11 and 51 that illuminate the illuminated surface 3a of the illuminated member 3 with the light emitted from the light controlled emitting surfaces 15 and 53 and the light emitted from the light controlled emitting surfaces 15 and 53. The light flux controlling members 11 and 51 according to the present invention have the optical axis L of the light emitting element 10 substantially parallel to the irradiated surface 3a.
1 and the light emitting element 10 are arranged so as to face the light emitting element 10 on a one-to-one basis. Further, the light flux controlling members 11 and 51 according to the present invention are incident surfaces 17 and 55 on which light from the light emitting element 10 is incident, and a total reflection surface portion 1 that is an outer surface of the light flux controlling members 11 and 51.
6b, 54 and first light exit surfaces 15a, 53 constituting part of the light control exit surfaces 15, 53
a and second light emitting surface portions 15b, 45, 48, which constitute part of the light control light emitting surfaces 15, 53,
53b and concave surface portions 16a, 53c formed at positions facing the incident surfaces 17, 55,
have. The total reflection surface portions 16b and 54 totally reflect the light constituting the light beam so as to narrow the solid angle of the light beam from the light emitting element 10 incident from the incident surfaces 17 and 55. The concave surface portions 16a and 53c totally reflect or refract light in the vicinity of the optical axis L1 in a direction away from the optical axis L1. The first exit surface portions 15a and 53a are configured to emit the light totally reflected by the total reflection surface portions 16b and 54 in a direction away from the optical axis L1. Further, the second emission surface portions 15b, 45, 48, 53b are
When it is assumed that all of the light control emission surfaces 15 and 53 are configured by the first emission surface portions 15a and 53a, at least part of the light that cannot illuminate the irradiated surface 3a The irradiated surface 3a is deflected and emitted in a direction in which it can be illuminated.

As shown in FIGS. 1 to 4, FIGS. 11 to 14, and FIG.
Light-emitting device 2 comprising light flux controlling members 11 and 51 according to the invention of claim 1
It is about.

As shown in FIGS. 1 to 4, 11 to 14, and 16, the invention of claim 3 is a light emitting device 2 according to the invention of claim 2, and an object to be illuminated with light emitted from the light emitting device 2. The illumination device 1 is provided with the illumination member 3.

According to the present invention, since the irradiated surface of the irradiated member can be efficiently illuminated with the light emitted from the light flux controlling member disposed on the end side of the irradiated member, the area approximately the same as the irradiated surface. Compared with an illuminating device using the above light guide plate, the illumination quality of the irradiated surface can be significantly reduced and the weight of the illuminating device can be significantly reduced.

It is a figure which shows the illuminating device which concerns on embodiment of this invention. FIG. 1A is a schematic cross-sectional view of the illumination device including the reference optical axis of the light emitting device. FIG. 1B is an external perspective view showing the illumination device as viewed obliquely from above. It is sectional drawing containing the reference | standard optical axis of the light-emitting device which concerns on embodiment of this invention. It is a figure which shows the light beam control member which concerns on 1st Embodiment of this invention. FIG. 3A is an external perspective view of the light flux controlling member as viewed obliquely from above, and FIG. 3B is an external perspective view of the light flux control member as viewed obliquely from below. It is a figure which shows the light beam control member which concerns on 1st Embodiment of this invention. 4A is a plan view of the light flux controlling member, FIG. 4B is a sectional view of the light flux controlling member cut along the line A1-A1 of FIG. 4A, and FIG. 4C is the light flux. FIG. 4D is a side view of the light flux controlling member, FIG. 4E is a rear view of the light flux controlling member, and FIG. 4F is along the line A2-A2 in FIG. It is sectional drawing of the light beam control member shown cut off. It is a figure for demonstrating the function of each part (however, 2nd output surface part is excluded) of the light beam control member which concerns on 1st Embodiment of this invention. The holder used in order to hold | maintain the light beam control member which concerns on 1st Embodiment of this invention is shown. 6A is a plan view of the holder, FIG. 6B is a sectional view of the holder cut along the line A3-A3 in FIG. 6A, and FIG. 6C is a rear view of the holder. is there. FIG. 7A is a perspective view showing the relationship between the light flux controlling member according to the first embodiment and the coordinate axis, and FIG. 7B is a perspective view showing the relationship between the light flux controlling member according to the comparative example and the coordinate axis. is there. FIG. 8A is a diagram schematically showing the optical path of the light emitted from the light emitting element in association with the light flux controlling member and the measurement surface of the first embodiment, and FIG. 8B is the light emitted from the light emitting element. FIG. 5 is a diagram schematically showing the optical path in association with a light flux controlling member and a measurement surface of a comparative example. FIG. 9A is a diagram showing the illuminance on the measurement surface illuminated with the light emitted from the light flux controlling member according to the first embodiment separately in the X-axis direction and the Y-axis direction, and FIG. It is a figure which shows the illumination intensity on the measurement surface illuminated with the light radiate | emitted from the light beam control member which concerns on a comparative example separately in a X-axis direction and a Y-axis direction. FIG. 10A is a diagram schematically showing the illuminance distribution on the measurement surface illuminated with the light emitted from the light flux controlling member according to the first embodiment when viewed from the direction along the Z axis. b) is a diagram schematically showing an illuminance distribution on a measurement surface illuminated with light emitted from a light flux controlling member according to a comparative example when viewed from a direction along the Z-axis. It is an external appearance perspective view which shows the light beam control member which concerns on 2nd Embodiment of this invention seeing from diagonally upward. It is an external appearance perspective view which shows the light beam control member which concerns on 3rd Embodiment of this invention seeing from diagonally upward. It is an external appearance perspective view which shows the light beam control member which concerns on 4th Embodiment of this invention seeing from diagonally upward. FIG. 14A is a plan view of the light flux controlling member according to the fourth embodiment, and FIG. 14B is a sectional view showing the light flux controlling member of FIG. 14A cut along the line A4-A4. 14 (c) is a rear view of the light flux controlling member according to the fourth embodiment, and FIG. 14 (d) is an enlarged view of a portion B in FIG. 14 (b). It is a figure which shows the holder used in order to hold | maintain the light beam control member which concerns on 4th Embodiment. 15A is a plan view of the holder, FIG. 15B is a sectional view of the holder cut along the line A5-A5 in FIG. 15A, and FIG. 15C is a rear view of the holder. is there. It is sectional drawing of the light-emitting device using the light beam control member which concerns on 4th Embodiment, and the holder holding this. It is an external appearance perspective view of the light beam control member as a comparative example of the light beam control member which concerns on 4th Embodiment. It is a figure for demonstrating the function of each part (however, 2nd output surface part is excluded) of the light beam control member which concerns on 4th Embodiment of this invention. It is sectional drawing of the conventional illuminating device.

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

(Light emitting device and lighting device)
1 and 2 show a lighting device 1 according to the present embodiment and a light emitting device 2 constituting the lighting device 1. Among these, FIG. 1A is a schematic cross-sectional view of the illumination device 1 including the reference optical axis L0 of the light-emitting device 2. Moreover, FIG.1 (b) is an external appearance perspective view which shows the illuminating device 1 seeing from diagonally upward. FIG. 2 is a cross-sectional view including the reference optical axis L0 of the light emitting device 2. Here, the reference optical axis L0 refers to the traveling direction of light at the center of the three-dimensional emitted light beam from the light emitting device 2.

As shown in FIG. 1, the illuminating device 1 includes a planar illuminated member 3 (for example, a light transmissive member).
A pair of advertising panels) are arranged so as to face each other, the lower ends of the illuminated members 3 and 3 are supported by the bottom plate 4, and the gap between the left end and the right end of the illuminated members 3 and 3 are respectively set on the side plate. 5,5
A casing 8 having a space 7 inside by closing the upper ends of the illuminated members 3 and 3 with a top plate 6.
Is configured. And this illuminating device 1 is the upper surface of the baseplate 4 which comprises the housing | casing 8 (casing 8
The light emitting device 2 is attached to the inside of the housing 8, so that the light emitting device 2 is accommodated inside the housing 8, and the pair of illuminated members 3, 3 are on the back side (inside space side) and from the lower end side. The illuminated surfaces (inner surfaces) 3a and 3a of the illuminated members 3 and 3 are illuminated by the light emitting device 2. Also,
In the illuminating device 1 shown in FIG. 1, the pair of illuminated members 3, 3 is composed of the bottom plate 4 and the top plate so that the distance between the pair of illuminated members 3, 3 is slightly larger on the upper end side than on the lower end side. 6 is fixed. The pair of illuminated members 3 and 3 are arranged so that the distance on the upper end side is slightly larger than the distance on the lower end side or in parallel depending on the emitted light characteristics of the light emitting device 2. Alternatively, the upper end side interval may be slightly smaller than the lower end side interval. That is, the pair of illuminated members 3, 3 is in such a posture that the illuminated surfaces 3 a, 3 a are illuminated by the light emitting device 2, and in the cross section including the optical axis L 1 of the light emitting element 10, with the optical axis L 1 as an axis. What is necessary is just to arrange | position in the substantially symmetrical position. The light emitting device 2 is attached to the bottom plate 4 so that the reference optical axis L0 is positioned substantially parallel to the irradiated surface 3a.

As shown in FIG. 2, the light emitting device 2 emits light from the light emitting element 10 (for example, an LED sealed by an LED and a sealing member) via a light flux control member 11.
The light emitting element 10 and the light flux controlling member 11 are in one-to-one correspondence. The light emitting element 10 includes a substrate 12
Is fixed to the bottom plate 4 of the housing 8 (see FIG. 1). Further, the light flux controlling member 11 is fixed to the substrate 12 via the holder 13. In the present embodiment, the light emitting element 1
A case where the optical axis L1 of 0 (the traveling direction of light at the center of the three-dimensional outgoing light beam from the light emitting element 4) and the reference optical axis L1 will be described as an example. Therefore, in the following description:
The reference optical axis L0 will be described in other words as the optical axis L1.

(First embodiment of light flux controlling member)
3 to 4 show the first embodiment of the light flux controlling member 11. Note that FIG.
) Is an external perspective view of the light flux controlling member 11 as viewed obliquely from above, and FIG. 3B is an external perspective view of the light flux control member 11 as viewed obliquely from below. 4A is a plan view of the light flux controlling member 11, and FIG. 4B is a light flux controlling member 1 cut along the line A1-A1 in FIG. 4A.
4 (c) is a front view of the light flux controlling member 11, FIG. 4 (d) is a side view of the light flux controlling member 11, and FIG. FIG. 4 (f) is a rear view.
FIG. 6 is a cross-sectional view of the light flux controlling member 11 cut along the line A2-A2 in FIG.

The light flux controlling member 11 is formed of a transparent resin material such as PMMA (polymethyl methacrylate), PC (polycarbonate), EP (epoxy resin), or transparent glass. The light flux controlling member 11 is formed such that the planar shape is a circular shape, a light control emitting surface 15 is formed on the upper surface side of the ring-shaped flange 14, and the total reflection surface 16 and the lower surface side of the flange 14 are formed. An incident surface 17 is formed. The light flux controlling member 11 is disposed on the substrate 12 so that the central axis 18 thereof coincides with the optical axis L1 of the light emitting element 10 (see FIG. 2). Therefore, the center axis 18 of the light flux controlling member 11 is appropriately rewritten as the optical axis L1 for description.

The incident surface 17 of the light flux controlling member 11 has a recess 2 formed on the back surface 20 side of the light flux controlling member 11.
The cross-sectional shape is an isosceles trapezoidal shape, and is formed to be rotationally symmetric about the central axis 18. The incident surface 17 of the light flux controlling member 11 includes a first incident surface 17a that is the bottom surface of the recess 21 and a second incident surface 17b that is a tapered cylindrical surface extending from the first incident surface 17a to the opening edge of the recess 21. have. Here, the second incident surface 17 b is the first incident surface 1.
The inner diameter gradually increases from the first incident surface 17a side to the back surface 20 (opening edge) side so that the inner diameter dimension on the opening edge side is larger than the inner diameter dimension of the end edge on the 7a side, It is formed in consideration of refraction when light from the light emitting element 10 is incident and a draft gradient for releasing from the mold.

The total reflection surface 16 of the light flux controlling member 11 has a substantially total cone-shaped first total reflection surface 16a formed so as to be rotationally symmetric with respect to the central axis 18 and having the top portion down, and the first total reflection surface. And a substantially total tapered second total reflection surface 16b which is located radially outward from the surface 16a and is opposed to the first total reflection surface 16a.

The first total reflection surface 16a mainly reflects light incident from the first incident surface 17a toward the second total reflection surface 16b. The first total reflection surface 16a is an aspherical concave surface portion that expands from the position near the first incident surface 17a along the central axis 18 toward the flange 14, and has a substantially inverted conical space 22 inside. Is formed. The first total reflection surface 16a converts the light beam emitted from the light emitting point 23 of the light emitting element 10 and enters the light beam control member 11 from the first incident surface 17a into a parallel light beam, and is on the second total reflection surface 16b side. Is totally reflected (see FIG. 5). Thereby, the light beam density in the vicinity of the optical axis L1 in the light beam emitted from the light emitting element 10 is reduced. In FIG. 5, the light emitting point 23
Is an intermediate position from the optical axis L 1 (light emission center 24) of the light emitting element 10 to the outer edge of the light emitting surface 25.

The second total reflection surface 16b includes the light totally reflected by the first total reflection surface 16a and the second incident surface 17b.
Then, the light that directly enters and reaches the inside of the light flux controlling member 11 is totally reflected toward the light control emitting surface 15 side. The second total reflection surface 16b increases in diameter from the back surface 20 side toward the flange 14 side along the central axis 18, so that the light guide portion 26 is formed between the first total reflection surface 16a and the second total reflection surface 16b. The first total reflection surface 16a is located farther outward in the radial direction, and the central axis 1
8 is a rotationally symmetric surface about 8 and is the outer peripheral surface of the light flux controlling member 11.

A disk shape centering on the central axis 18 is formed on the upper part of the first total reflection surface 16a and the second total reflection surface 16b (the upper part in FIGS. 4B and 4C and opposite to the back surface 20). Are formed so as to protrude outward in the radial direction of the second total reflection surface 16b. The flange 14 is engaged with the flange receiving recess 27 of the holder 13, and the center axis 18 of the light flux controlling member 11 and the holder 13 are engaged.
The center axis 28 is aligned, and is fixed to the holder 13 by adhesion or the like, or is held in a detachable state (see FIG. 2). The upper surface side of the flange 14 is a light control emission surface 15.

The light control emission surface 15 is located on the opposite side of the back surface 20, and the shape in plan view is a rotationally symmetric hollow disk shape with the central axis 18 as the center, and the first emission surface portion 15a and the first emission surface portion 15a having different light emission characteristics. 2 emission surface part 15b.

The first emission surface portion 15a is a plane that is substantially the same width as the inner diameter dimension of the flange 14 and extends from one radial outer end of the flange 14 to the other radial outer end along the center line 30, and its normal direction Is parallel to the central axis 18 and is symmetrical with respect to the center lines 30 and 31 (see FIG. 4A). The first exit surface portion 15a includes the first entrance surface 17a and the second entrance surface 1.
The solid angle of the light beam emitted from the light emitting element 10 that has entered the light beam control member 11 from 7b is set to the second angle.
After being narrowed by the total reflection surface 16b, the light is emitted in a direction slightly away from the optical axis L1 (see FIGS. 1 and 5).

The second emission surface portion 15b is an inclined surface (surface) of the pair of protrusions 32 and 32 positioned so as to sandwich the first emission surface portion 15a from both sides, and the shape of the projection 32 viewed from the front side is an isosceles triangle. The ridge line of the top portion 33 of the protrusion 32 is positioned along the center line 31, and the ridge line of the top portion 33 of the protrusion 32 is orthogonal to the direction in which the first emission surface portion 15a extends (the direction along the center line 30). It is like that. And the 2nd output surface part 15b which is a pair of inclined surface which forms the protrusion 32
, 15b are inclined in the opposite direction from the top 33 and along the direction in which the first light exit surface 15a extends (the direction in which the center line 30 extends). Such a second emission surface portion 15b has an inclination direction (center) of the inclined surface (second emission surface portion 15b) of the protrusion 32 rather than the amount of light in the direction in which the ridge line of the top portion 33 of the protrusion 32 extends (the direction along the center line 31). The light is deflected and emitted so that the amount of light in the direction along the line 30 increases.

(holder)
FIG. 6 shows a holder 13 used to hold the light flux controlling member 11 in a state of being positioned with respect to the light emitting element 10 (see FIG. 2). 6A is a plan view of the holder 13, and FIG. 6B is a holder 13 cut along the line A3-A3 in FIG. 6A.
FIG. 6C is a rear view of the holder 13.

As shown in FIG. 6, the holder 13 includes a cylindrical portion 34 that holds the light flux controlling member 11, and a plate-like light source holding portion 36 that is formed on the back surface 35 side of the cylindrical portion 34. Yes.

The cylindrical portion 34 is formed so that a substantially frustoconical space 37 that accommodates the light flux controlling member 11 penetrates along the central axis 28, and a flange accommodating recess for engaging the flange 14 of the light flux controlling member 11. A location 27 is formed at the upper end.

The inner wall 40 forming the space 37 of the cylindrical portion 34 is between the outer peripheral surface (second total reflection surface 16 b) of the light beam control member 11 when the light beam control member 11 is accommodated in the space 37 of the holder 13. It is formed in a tapered shape in which the inner diameter gradually decreases from the upper end to the lower end so as to generate a gap (see FIG. 2).

The flange receiving recess 27 is a ring-shaped recess formed along the upper edge of the space 37, the inner peripheral wall 27 a in close contact with the outer peripheral surface of the flange 14 of the light flux controlling member 11, and the light flux controlling member 1.
It consists of a bottom wall 27b that supports the lower surface of one flange 14. Then, by engaging the flange 14 of the light beam control member 11 in the flange receiving recess 27, the center axis 28 of the holder 13 and the center axis 18 of the light beam control member 11 are coaxially aligned. Is performed (see FIG. 2).

The light source holding part 36 is a plate-like member protruding to the back surface 35 side of the cylindrical part 34, and the light emitting element 1
A through hole 42 is formed to accommodate the 0 prismatic case 41 with a minute gap. The light source holding portion 36 is formed on the substrate 1 in a state where the case 41 of the light emitting element 10 is accommodated in the through hole 42.
2, the holder 13 can be held in a state where the holder 13 is positioned with respect to the light emitting element 10 (a state in which the optical axis L <b> 1 and the central axis 28 are matched). Therefore, the holder 13 engages the flange 14 of the light flux controlling member 11 with the flange receiving recess 27, engages the case 41 of the light emitting element 10 with the through hole 42 of the light source holding part 36, and mounts the light source holding part 36 on the substrate. 12 on the center axis 18 of the light flux controlling member 11 and the center axis 2 of the holder 13.
The light flux controlling member 11 can be positioned and held with respect to the light emitting element 10 in a state where 8 is coaxially aligned with the optical axis L1 of the light emitting element 10 (see FIG. 2). In this embodiment, the light emitting surface 25 of the light emitting element 10 and the light flux controlling member are formed so that a slight gap is generated between the outer surface of the light emitting element 10 and the first incident surface 17a of the light flux controlling member 11. The light flux controlling member 11 and the light emitting element 10 are positioned by the holder 13 so that the back surface 20 of the light source 11 is located on the same plane (so that the height position on the substrate 12 is the same). (See FIG. 2).

When such a holder 13 is formed of a transparent resin material such as PMMA (polymethyl methacrylate), PC (polycarbonate), EP (epoxy resin), or transparent glass, similarly to the light flux controlling member 11, It is also possible to emit light from the light emitting element 10 as illumination light.

(Emission light characteristics of light flux controlling member)
7 to 10 are diagrams for explaining the emitted light characteristics of the light flux controlling member 11 according to the present embodiment in comparison with the emitted light characteristics of the light flux controlling member 43 according to the comparative example. Of these, FIG.
These are perspective views which show the relationship between the light beam control member 11 which concerns on this embodiment, and a coordinate axis, FIG.7 (b).
These are perspective views which show the relationship between the light beam control member 43 which concerns on a comparative example, and a coordinate axis. Further, FIG.
) Indicates the optical path of the light emitted from the light emitting element 10 and the light flux controlling member 11 and the measurement surface 44 of the present embodiment.
FIG. 8B is a diagram schematically showing the optical path of the light emitted from the light emitting element 10 in association with the light beam control member 43 and the measurement surface 44 of the comparative example. . FIG. 9A shows the measurement surface 4 illuminated with light emitted from the light flux controlling member 11 according to this embodiment.
FIG. 9B shows the illuminance on the measurement surface 44 illuminated with the light emitted from the light beam control member 43 according to the comparative example. It is a figure divided and shown to an axial direction and a Y-axis direction. FIG. 10A shows the light flux controlling member 1 according to the present embodiment.
FIG. 10B is a diagram schematically showing an illuminance distribution on the measurement surface 44 illuminated with the light emitted from 1, viewed from the direction along the Z axis, and FIG. 10B is a diagram from the light flux controlling member 43 according to the comparative example. It is a figure which shows typically the illumination intensity distribution on the measurement surface 44 illuminated with the emitted light seeing from the direction along a Z-axis. 8 to 10 schematically show the results of a simulation experiment regarding the emitted light characteristics of the light flux controlling members 11 and 43. FIG. 9A and 9B, the horizontal axis indicates the distance (mm) from the optical axis (0 position), and the vertical axis indicates the illuminance on the measurement surface 44 (
lx).

As shown in FIG. 7A, the light flux controlling member 11 according to the present embodiment has a second emission surface portion 15b.
Are arranged so that the ridgeline of the top portion 33 is located along the X-axis direction. In addition, FIG.
As shown in FIG. 4, in the light flux controlling member 43 according to the comparative example, all of the light control emitting surface 15 corresponds to the first emitting surface portion 15a of the light flux controlling member 11 according to the present embodiment.

As shown in FIGS. 8A and 8B, the light beam control member 11 according to the present embodiment and the light beam control member 43 according to the comparative example are configured such that light emitted from the light emission center P1 of the light emitting element 10 is the first incident surface. 17a
From the position P2, the position P3 where the light entering the light flux controlling member 11 from the position P2 reaches the first total reflection surface 16a, and the light reflected at the position P3 of the first total reflection surface 16a 2 The position P4 reaching the total reflection surface 16b is the same (see Tables 1 and 2). In addition, Table 1 shows the numerical value of the simulation experiment result regarding the emitted light characteristic of the light flux controlling member 11 according to the present embodiment. Table 2 shows numerical simulation experiment results regarding the emitted light characteristics of the light flux controlling member 43 according to the comparative example.

However, the light flux controlling member 11 according to the present embodiment shown in FIG. 8A has the second total reflection surface 16b.
The light reflected at the position P4 reaches the position P5 of the second exit surface portion 15b of the light control exit surface 15 (see Table 1). On the other hand, the light flux controlling member 43 according to the comparative example shown in FIG.
The light reflected at the position P4 of the second total reflection surface 16b is reflected by the light control emission surface 15 (first emission surface portion 15a).
) Position P5 ′, and a position P5 ′ different from position P5 in FIG. 8A is the arrival position (see Table 2).

Further, in the light flux controlling member 11 according to this embodiment shown in FIG. 8A, the light emitted from the position P5 of the second emission surface portion 15b reaches the position P6 of the measurement surface 44 (see Table 1). . On the other hand, the light flux controlling member 43 according to the comparative example shown in FIG.
The light emitted from the light reaches the position P6 ′ of the measurement surface 44, and the position P6 in FIG.
A position P6 ′ different from that is reached (see Table 2).

The dimension (−27.06 mm) of the position P6 on the measurement surface in the Y-axis direction in Table 1 and the Y in Table 2
As apparent from the comparison with the dimension (3.9278 mm) of the position P6 ′ on the measurement surface in the axial direction, the light flux controlling member 11 according to this embodiment is more Y than the light flux controlling member 43 according to the comparative example.
Light is emitted with a large bias in the axial direction.

As shown in FIG. 9A, the illuminance distribution along the Y-axis direction on the measurement surface 44 illuminated with the light emitted from the light flux controlling member 11 according to this embodiment is centered on the optical axis L1. The curve C1 is a line-symmetric curve C1 and is represented by a curve C1 in which peak positions occur at positions + ya and −ya in the Y-axis direction from the optical axis L1 (see FIG. 10A). Further, as shown in FIG. 9A, the amount of light emitted from the light flux controlling member 11 according to the present embodiment is more along the Y-axis direction than the amount of light emitted along the X-axis direction. The amount of emitted light is greater. This is because the second emission surface portions 15b and 15b are inclined in the opposite direction (along the + Y axis direction and the −Y axis direction) with the top portion 33 as a boundary. Further, as shown in FIG. 9A, the illuminance distribution along the X-axis direction on the measurement surface 44 illuminated with the light emitted from the light flux controlling member 11 according to the present embodiment is centered on the optical axis L1. The curve C2 is symmetric with respect to the line C2 and the curve C2 has a peak position on the optical axis L1.

On the other hand, as shown in FIG. 9B, the illuminance distribution along the X-axis direction and the Y-axis direction on the measurement surface 44 illuminated with the light emitted from the light flux controlling member 43 according to the comparative example is They are exactly the same, and are represented by a line-symmetric curve C3 centered on the optical axis L1 and a curve C3 in which a peak position occurs on the optical axis L1. In addition, as shown in FIG.10 (b), the light beam control member 4 which concerns on a comparative example
The illuminance on the measurement surface 44 illuminated with the light emitted from 3 has a rotationally symmetric distribution around the optical axis L1. This is because the light control exit surface 15 of the light flux controlling member 43 according to the comparative example is a rotationally symmetric plane centered on the optical axis L1, and is a plane located on a virtual plane orthogonal to the optical axis L1. .

(Effect of this embodiment)
As described above, the light flux controlling member 11 according to the present embodiment is configured so that the ridge line of the top 33 of the protrusion 32 constituting the second emission surface portion 15b is substantially parallel to the illuminated surface 3a of the illuminated member 3. When arranged (so that the Y axis in FIG. 7 is substantially orthogonal to the irradiated surface 3a), the amount of light that illuminates the irradiated surface 3a is increased as compared with the light flux controlling member 43 according to the comparative example. (See FIG. 1 (a), FIG. 7 (a), (b)). That is, the light flux controlling member 1 according to the present embodiment.
Reference numeral 1 denotes at least a part of light (light in the direction along the X axis in FIG. 7A) that cannot be used as illumination light of the irradiated surface 3a by the light flux controlling member 43 according to the comparative example. 15a can be deflected and emitted toward the irradiated surface 3a (toward the + Y axis and −Y axis directions in FIG. 7A), and the light from the light emitting element 10 can be efficiently used as illumination light for the irradiated surface 3a. It can be used (see FIG. 1 (a), FIG. 7 (a), (b)). Moreover, when the light flux controlling member 11 according to the present embodiment is disposed between the pair of opposed irradiated surfaces 3a and 3a, both the irradiated surfaces 3a and 3a can be illuminated equally. (See FIG. 1 (a)). Note that “substantially parallel” and “substantially orthogonal” refer to an assembly error of the light flux controlling member 11 with respect to the irradiated surface 3a.

Therefore, when the light flux controlling member 11 according to the present embodiment is combined with the light emitting element 10 to constitute the light emitting device 2, it is possible to illuminate the illuminated member 3 without using a light guide plate as in the prior art. Therefore, compared with the conventional illuminating device using the light guide plate having the same area as the irradiated surface, the configuration of the illuminating device 1 can be simplified and the illuminating device 1 can be significantly reduced in weight. .

Further, the light emitting device 2 using the light flux controlling member 11 according to the present embodiment has the light flux controlling member 11.
Compared to the case where the irradiated surfaces 3a and 3a are illuminated only by the light emitting element 10 without using the light emitting element 10, the light emitting element 1
The illuminated surfaces 3a, 3a near the top plate 6 away from 0 can also be illuminated with sufficient light, and
Generation of a specific bright portion in the vicinity of the light emitting element 10 can be prevented.

(Second embodiment of light flux controlling member)
FIG. 11 shows a second embodiment of the light flux controlling member 11. The light flux controlling member 11 shown in FIG. 11 has a projection 46 whose upper surface is an arcuate curved surface 45 instead of the isosceles triangular projection 32 constituting the second emission surface portion 15b in the light flux controlling member 11 of the first embodiment. Is. The top of the projection 46 is formed to be at the same position as the top 33 of the isosceles triangle projection 32 in the light flux controlling member 11 of the first embodiment (the same position when the light flux controlling member 11 is viewed in plan). Yes. The arcuate curved surface 45 of the protrusion 46 in the light flux controlling member 11 according to this embodiment functions in substantially the same manner as the second emission surface portion 15b in the light flux controlling member 11 according to the first embodiment, and deflects light from the light emitting element. Can be emitted. That is, the arcuate curved surface 45 of the light flux controlling member 11 according to this embodiment is the second of the light flux controlling member 11 according to the first embodiment.
This corresponds to the emission surface portions 15b and 15b. The light flux control member 11 having such a configuration can obtain the same effects as the light flux control member 11 according to the first embodiment.

(Third embodiment of light flux controlling member)
FIG. 12 shows a third embodiment of the light flux controlling member 11. The light flux controlling member 11 shown in FIG. 12 is formed by forming a recess 47 instead of the isosceles triangular protrusion 32 constituting the second emission surface portion 15b in the light flux controlling member 11 of the first embodiment. This light flux controlling member 1
1 dent 47 is an isosceles triangle with the top as viewed from the front side, and the inclined surface 48
48 are formed at the same position as the top 33 of the isosceles triangular projection 32 in the light flux controlling member 11 of the first embodiment (the same position when the light flux controlling member 11 is viewed in plan). And a pair of inclined surface 48 of the dent 47 of the light beam control member 11 which concerns on this embodiment.
, 48 function in substantially the same manner as the second exit surface portions 15b, 15b in the light flux controlling member 11 of the first embodiment, and can deflect and emit light from the light emitting element. That is, the pair of inclined surfaces 48, 48 of the light flux controlling member 11 according to the present embodiment is the light flux controlling member 1 according to the first embodiment.
This corresponds to one second emission surface portion 15b, 15b. The light flux controlling member having such a configuration can obtain the same effects as the light flux controlling member 11 according to the first embodiment.

(Fourth embodiment of light flux controlling member)
13 to 14 show a light flux controlling member 51 according to a fourth embodiment of the present invention. FIG. 13 is an external perspective view of the light flux controlling member 51 (external view seen from obliquely above). 14A is a plan view of the light flux controlling member 51, FIG. 14B is a cross-sectional view showing the light flux controlling member 51 of FIG. 14A cut along the line A4-A4, and FIG. c) is a rear view of the light flux controlling member 51, and FIG. 14 (d) is an enlarged view of a portion B of FIG. 14 (b).

The light flux controlling member 51 is formed of a transparent resin material such as PMMA (polymethyl methacrylate), PC (polycarbonate), EP (epoxy resin), or transparent glass, like the light flux controlling member 11 of the first embodiment. Yes. In this light flux controlling member 51, a light control emitting surface 53 is formed on the upper surface side of the ring-shaped flange 52, and a total reflection surface 54 and an incident surface 55 are formed on the lower surface side of the flange 52. The light flux controlling member 51 is mounted on the substrate 12 to which the light emitting element 10 is fixed so that the central axis 56 is coaxial with the optical axis L1 of the light emitting element 10 (FIG. 16). reference).

The incident surface 55 of the light beam control member 51 has a recess 5 formed on the back surface 15 side of the light beam control member 51.
8 has an isosceles trapezoidal cross-sectional shape and is formed to be rotationally symmetric about the central axis 56. The incident surface 55 of the light flux controlling member 51 includes a first incident surface 55a that is the bottom surface of the recess 58, and a second incident surface 55b that is a tapered cylindrical surface extending from the first incident surface 55a to the opening edge of the recess 58. have. The first incident surface 55a is formed with a disk-shaped flat portion 55a1 at the center including the central axis 56, and a Fresnel lens 55a2 centered on the central axis 56 is formed on the radially outer side of the flat portion 55a1. ing. The second incident surface 55b has a larger inner diameter dimension on the opening edge side than the inner diameter dimension of the edge on the first incident surface 55a side.
The inner diameter gradually increases from the first incident surface 55a side toward the opening edge side.

The back surface 57 of the light flux controlling member 51 is a virtual plane including the opening edge of the recess 58, and the central axis 56.
Is a virtual plane orthogonal to

The total reflection surface 54 of the light flux controlling member 51 is an outer surface extending from the outer peripheral edge (opening edge of the recess 58) of the back surface 57 to the lower surface of the flange 52, and is a rotationally symmetric surface (substantially approximately) formed so as to surround the central axis 56. A frustoconical outer surface). The total reflection surface 54 of the light flux controlling member 51 is the back surface 5.
The outer diameter gradually increases from 7 toward the flange 52, and the busbar is outside (the center axis 56
It is an arcuate curve convex to the side away from (see FIG. 14B). And this total reflection surface 5
No. 4 is configured to totally reflect light from the light emitting element 10 incident mainly from the second incident surface 55b toward the light control emitting surface 53 side (see FIG. 18).

The light control exit surface 53 of the light flux controlling member 51 is located on the opposite side of the back surface 57, and the shape in plan view is a disc shape centered on the central axis 56, and the first exit surface portions 53a, 53a, It has the 2nd output surface part 53b and the 3rd output surface part 53c.

As shown in FIGS. 14A to 14B, the first emission surface portion 53 a is a plane formed in a band shape along the center line 60, and its normal direction is parallel to the center axis 56. It is a formed plane. The first emission surface portion 53a has a line-symmetric shape with respect to the center line 60, and the center line 6
It is formed from one radially outer peripheral end of the flange 12 along 0 to the other radially outer end. The first exit surface portion 53a mainly transmits light that has been incident on the inside of the light beam control member 51 from the second incident surface 55b and then totally reflected by the total reflection surface 54 to narrow the solid angle of the light beam. L
The light is emitted in a direction slightly away from 1 (see FIG. 18). Further, the first emission surface portion 53a emits part of the light incident from the first incident surface 55a in a direction slightly away from the optical axis L1 (see FIG. 18).

The second emission surface portion 53b is a surface of a pair of projections 61 and 61 positioned so as to sandwich the first emission surface portion 53a from both sides, and a pair of inclined surfaces forming a projection 61 having an isosceles triangle shape when viewed from the front side. It is. And the top part 62 of the protrusion 61 which is a crossing part of a pair of 2nd output surface parts 53b and 53b is the direction where the ridgeline is located along the centerline 63, and the ridgeline extends the 1st output surface part 53a. It is orthogonal to (center line 60). The second emission surface portions 53 b and 53 b that are a pair of inclined surfaces forming the protrusion 61 are inclined in the opposite direction from the top portion 62 and along the direction in which the center line 60 extends. Such a second emission surface portion 53b has the projection 6
Light so that the amount of light in the direction orthogonal to the direction in which the ridge line of the top 62 extends (direction along the center line 60) is larger than the amount of light in the direction in which the ridge line of the top 62 extends (direction along the center line 63). Is deflected and emitted.

The third exit surface portion 53 c is located at the center of the light control exit surface 53 when the light control exit surface 53 is viewed in plan. The third emission surface portion 53c is an inner surface forming an aspherical concave portion centered on the central axis 56, and light incident from the first incidence surface 55a is transmitted from the first emission surface portion 53a around the optical axis L1. Is also greatly expanded and emitted (see FIG. 18). Therefore, the light flux controlling member 51 having the third exit surface portion 53c can efficiently illuminate the illuminated surface near the light control exit surface 53. As long as the concave surface portion functions in this way, the shape is not limited to the aspherical shape, and may be formed in a conical shape having a top on the optical axis L1.

The light flux controlling member 51 according to the present embodiment is housed in a holder 64 as shown in FIG. 15, and when assembled to the light emitting element 10 and the substrate 12 via the holder 64, the light flux controlling member 11 of the first embodiment. Similarly, the center axis 56 is positioned so as to be coaxial with the optical axis L1 of the light emitting element 10, and is supported on the substrate 12 while being positioned (FIG. 16).
reference). The holder 64 shown in FIG. 15 has the same configuration as the holder 13 shown in FIG. 6, so that the constituent parts corresponding to the holder 13 shown in FIG. 6 are the same as the constituent parts of the holder 13 shown in FIG. The same reference numerals are given, and the description overlapping with the holder 13 shown in FIG. 6 is omitted.

As described above, the light flux controlling member 51 according to the present embodiment is the light flux controlling member 1 of the first embodiment.
1 has the same outgoing light characteristics. Therefore, the light flux controlling member 51 according to the present embodiment can obtain the same effects as the light flux controlling member 11 of the first embodiment.

Note that the light flux control member 65 shown in FIG. 17 is obtained by omitting the second emission surface portion 53b of the light flux control member 51 according to the present embodiment, and the light control emission surface 53 has the first emission surface portion 53a and the third emission surface portion. Since it is composed only of 53c, a rotationally symmetric light beam is emitted around the optical axis L1 (see FIG. 18), and when it is disposed between a pair of opposed illuminated members 3 and 3, the illuminated member The amount of light that can illuminate 3 is smaller than that of the light flux controlling member 51 of the present embodiment.

(Other variations)
The lighting device 1 of the present invention is not limited to the mode in which the light emitting device 2 is disposed on the bottom plate 4 (see FIG. 1), and the light emitting device 2 may be disposed on the top plate 6. The light emitting device 2 may be arranged. Moreover, you may make it the illuminating device 1 of this invention arrange | position the light-emitting device 2 in the plural or all of the bottom plate 4, the side plate 5, and the top plate 6. FIG. Furthermore, the illumination device 1 of the present invention may be arranged at a corner portion of the irradiated surface 3a when the irradiated surface 3a has a quadrangular shape.

Moreover, the illuminating device 1 of this invention uses the single or multiple light-emitting device 2 according to the magnitude | size of the to-be-irradiated surface 3a.

The light flux controlling members 11 and 51 used in the lighting device 1 of the present invention have a pair of protrusions 32 and 4.
However, the present invention is not limited to this, and the light control emission surfaces 15 and 53 are formed by more protrusions or depressions that function as second emission surface portions.
You may make it comprise some.

The light flux control members 11 and 51 of the present invention are along the total reflection surface portion (second total reflection surface 16b and total reflection surface 54) having a function of narrowing the solid angle of the total emitted light beam from the light emitting element 10, and along the optical axis L1. A concave surface portion (first total reflection surface 16a, third emission surface portion 53c) that deflects light that cannot reach the irradiated surface 3a to light toward the irradiated surface 3a, and the irradiated surface 3a. It is characterized by having three elements of the part (second emission surface part 15b, 53b) that deflects the light emitted in parallel to the light directed toward the irradiated surface 3a. -It is not limited to the shape of 4th Embodiment.

The light-emitting device according to the present invention can be applied to an internally-illuminated illumination device that illuminates an illuminated member such as an advertising panel from the back side, as well as an externally-illuminated illumination that illuminates the ceiling, floor surface, wall surface, etc. It can also be used as a device or a guide light.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Light emitting device, 3 ... Illuminated member, 3a ... Irradiated surface, 10 ... Light emitting element (for example, LED), 11, 51 ... Light flux controlling member, 15, 53 ... ... Light control exit surface, 15a, 53a ... 1st exit surface portion, 15b, 53b ... 2nd exit surface portion, 16a ... 1st
Total reflection surface (concave surface portion), 16b... Second total reflection surface (total reflection surface portion), 17, 55.
45... Arc-shaped curved surface (second exit surface portion) 48... Inclined surface (second exit surface portion) 53 c. Third exit surface portion (concave portion) 54 54 Total reflection surface (total reflection surface portion), L 1 ……optical axis

Claims (3)

The light emitting element is disposed on the end side of the illuminated member, emits light from the light emitting element from the light control emitting surface, and illuminates the illuminated surface of the illuminated member with the light emitted from the light control emitting surface. A light flux controlling member,
It is disposed so as to be positioned on the optical axis of the light emitting element substantially parallel to the irradiated surface, and to be opposed to the light emitting element on a one-to-one basis,
An incident surface on which light from the light emitting element is incident;
A total reflection surface portion serving as an outer surface of the light flux controlling member;
A first emission surface portion constituting a part of the light control emission surface;
A second emission surface portion constituting a part of the light control emission surface;
A concave surface portion formed at a position facing the incident surface,
The total reflection surface portion totally reflects light constituting the light flux so as to narrow a solid angle of the light flux from the light emitting element incident from the incident surface,
The concave surface portion totally reflects or refracts light in the vicinity of the optical axis in a direction away from the optical axis,
The first emission surface portion emits light that is mainly totally reflected by the total reflection surface portion in a direction away from the optical axis,
The second emission surface portion is configured to emit at least a part of light that cannot illuminate the irradiated surface when it is assumed that all of the light control emission surface is configured by the first emission surface portion. Deflected and emitted in the direction that can illuminate the illuminated surface,
A light flux controlling member characterized by the above.   A light emitting device comprising: a light emitting element; and the light flux controlling member according to claim 1. An illuminating device comprising: the light-emitting device according to claim 2; and a member to be illuminated illuminated with light emitted from the light-emitting device.

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