JP2013004233A - Luminous flux control member, light-emitting device, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminous flux control member used for a light-emitting device, which can efficiently illuminate the whole area of an irradiated surface arranged parallel to the center axis of the light-emitting device.SOLUTION: The luminous flux control member 120 includes an incident surface 131 for making light emitted from a light-emitting element 110 incident, a total reflection surface 132 for totally reflecting a part of light incident from the incident surface 131, and an emitting surface 133 for emitting a part of the light incident from the incident surface 131 and the light reflected with the total reflection surface 132. When viewing the luminous flux control member 120 on a plane, the maximum outer diameter φof the total reflection surface in a first direction D1 is larger than the maximum outer diameter φof the total reflection surface in a second direction D2 orthogonal to the first direction D1.

Description

  The present invention relates to a light flux controlling member that controls the traveling direction of light emitted from a light emitting element. The present invention also relates to a light emitting device having the light flux controlling member and an illumination device having the light emitting device.

  An internally-illuminated signboard is a signboard in which a light source is arranged inside the signboard to shine the signboard itself. Internally illuminated signboards are excellent in notification effect and are used in various places.

  In recent years, light emitting diodes (LEDs) have come to be used as light sources for internally illuminated signboards. Light emitting diodes have excellent characteristics such as small size, high power efficiency, bright color emission, no fear of ball breakage, excellent initial drive characteristics, strong vibration, strong on-off repetition, etc. Have.

  Since the emission direction of the light emitted from the light emitting diode is not controlled, when the light emitting diode is used as it is, the light diffuses and the irradiated surface cannot be efficiently illuminated. Therefore, in order to control the emission direction from the light emitting diode, a light source combining a light emitting diode and a total reflection lens has been proposed (for example, see Patent Document 1).

  Patent Document 1 discloses a light emitting device (display lamp) in which a total reflection lens is disposed on a light emitting element (light emitting diode). FIG. 1 is a cross-sectional view showing a configuration of a light emitting device 10 described in Patent Document 1. As shown in FIG. As shown in FIG. 1, the light emitting device 10 includes a light emitting element 11, a total reflection lens 12, and an exterior cover 15. The shape of the light emitting device 10 is rotationally symmetric (circular symmetric) with respect to the central axis CA.

  The total reflection lens 12 has a total reflection surface 13 and a flange 14. The exterior cover 15 is an opaque cylindrical member that holds the flange 14 of the total reflection lens 12. The exterior cover 15 functions as a support for the total reflection lens 12 and a light shielding cylinder. The total reflection surface 13 of the total reflection lens 12 reflects the light emitted from the light emitting element 11 toward the front of the total reflection lens 12. Thereby, the light emitted from the light emitting element 11 becomes light parallel to the central axis CA. As a result, the light emitting device 10 can efficiently illuminate a far irradiated surface.

JP 2005-268166 A

  The arrangement method of the light source in the internally illuminated signboard can be roughly divided into a direct method and an edge light method. FIG. 2A is a perspective view illustrating an example of a direct-lighting type internally-lit signboard, and FIG. 2B is a perspective view illustrating an example of a hollow-edge light-type internally-lit signboard. As shown in FIG. 2A, in the direct method, the light source 22 is disposed on the back side of the irradiated surface (display surface) 20. On the other hand, as shown in FIG. 2B, in the edge light system, the light source 22 is arranged on the outer periphery of the signboard. The hollow-edge-light internally illuminated signboard is superior to the direct-lighted internally illuminated signboard in that the structure can be simplified.

  When the light-emitting device 10 described in Patent Document 1 is employed as a light source of a hollow edge light system, an irradiated surface far from the light-emitting device 10 can be efficiently illuminated. However, the light emitting device 10 described in Patent Document 1 cannot sufficiently illuminate the irradiated surface located near the light emitting device 10 and away from the central axis CA. That is, the amount of light for illuminating the irradiated surface located near the light emitting device 10 and away from the central axis CA is insufficient. For this reason, when the light-emitting device 10 described in Patent Document 1 is used as a light source of a hollow edge light type internally-illuminated signboard, unevenness in illuminance may occur on the irradiated surface 20.

  FIG. 3A is a perspective view of a hollow edge light type internally illuminated signboard 30 using the light emitting device 10 described in Patent Document 1. FIG. FIG. 3B is a front view of the internally illuminated signboard 30 as viewed from the display surface 32 side. As shown in FIGS. 3A and 3B, when the light-emitting device 10 described in Patent Document 1 is used as a light source for an edge-lighted internally illuminated signboard, a dark region 34 is generated. This region 34 corresponds to a position located in the vicinity of the light emitting device 10 and away from the central axis CA (position away from the central axis CA ′ projected on the irradiated surface).

  The present invention has been made in view of the above points, and is a light flux controlling member used in a light emitting device, and efficiently covers the entire irradiated surface arranged substantially parallel to the central axis (optical axis) of the light emitting device. An object of the present invention is to provide a light flux controlling member that can be well illuminated. Another object of the present invention is to provide a light emitting device having the light flux controlling member and a lighting device having the light emitting device.

The light flux controlling member of the present invention is a light flux controlling member for controlling the traveling direction of the light emitted from the light emitting element, the incident surface for receiving the light emitted from the light emitting element, and the light incident from the incident surface. A total reflection surface that totally reflects a part of the incident surface, and a part of light incident from the incident surface and an exit surface that emits light reflected by the total reflection surface, the incident surface including the light emitting element and The opposite surface is formed so as to intersect with the central axis of the light flux controlling member, and the exit surface is formed at a position opposite to the incident surface so as to intersect with the central axis of the light flux controlling member. The reflecting surface surrounds the central axis of the light flux controlling member and is formed so that the diameter gradually increases from the incident surface side toward the emitting surface side, and when the light flux controlling member is viewed in plan view, the maximum outer diameter of the total reflection surface in the first direction φ But greater than the maximum outer diameter phi ₂ of the total reflection surface in a second direction perpendicular to said first direction, a configuration.

  The light emitting device of the present invention includes the light flux controlling member and the light emitting element, and the light flux controlling member is disposed so that a central axis of the light flux controlling member coincides with an optical axis of the light emitting element. Take.

  The illumination device of the present invention includes the light emitting device and a planar irradiated surface that is irradiated with light from the light emitting device, and the light emitting device includes the second direction and the irradiated surface. Are arranged so as to be parallel to each other.

  The light emitting device having the light flux controlling member according to the present invention can compensate for a shortage of light quantity on the irradiated surface located near the light emitting device and at a position away from the central axis in addition to the irradiated surface far from the light emitting device. it can. Moreover, the illuminating device of this invention can illuminate a to-be-irradiated surface more uniformly compared with the conventional illuminating device.

It is sectional drawing which shows the structure of the light-emitting device described in patent document 1. FIG. 2A and 2B are perspective views showing examples of internally illuminated signboards. FIG. 3A is a perspective view of a hollow edge light type internally illuminated signboard in which the light emitting device described in Patent Document 1 is arranged. FIG. 3B is a front view of the internally illuminated sign shown in FIG. 3A. 1 is a perspective view of a light emitting device according to Embodiment 1. FIG. 5A is a front view of the light-emitting device of Embodiment 1. FIG. 5B is a side view of the light-emitting device of Embodiment 1. FIG. 6A is a plan view of the light-emitting device of Embodiment 1. FIG. 6B is a bottom view of the light-emitting device of Embodiment 1. FIG. 7A is a cross-sectional view taken along line AA shown in FIG. 5B. 7B is a cross-sectional view taken along line BB shown in FIG. 5A. 2 is a plan perspective view of the light-emitting device of Embodiment 1. FIG. 9A and 9B are diagrams showing light passage paths in the light-emitting device of the first embodiment. 1 is a perspective view of a lighting device according to Embodiment 1. FIG. FIG. 3 is a partially enlarged bottom view of the lighting device according to the first embodiment. It is a schematic diagram which shows the positional relationship of a light-emitting device and a to-be-irradiated surface. FIG. 13A is a cross-sectional view illustrating an example of a double-sided internal illumination device. FIG. 13B is a cross-sectional view illustrating an example of a single-sided internal illumination device. FIG. 13C is a cross-sectional view illustrating an example of an external illumination type illumination device. FIG. 6 is a perspective view of a light emitting device according to a second embodiment. FIG. 15A is a front view of the light-emitting device of Embodiment 2. FIG. FIG. 15B is a rear view of the light-emitting device of Embodiment 2. FIG. 15C is a side view of the light-emitting device of Embodiment 2. FIG. 16A is a plan view of the light-emitting device of Embodiment 2. FIG. FIG. 16B is a bottom view of the light-emitting device of Embodiment 2. FIG. 17A is a cross-sectional view taken along the line CC shown in FIG. 15C. FIG. 17B is a cross-sectional view taken along the line DD shown in FIGS. 15A and 15B. FIG. 6 is a perspective view of a lighting device according to a second embodiment.

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

(Embodiment 1)
[Configuration of light emitting device]
4-7 is a figure which shows the structure of the light-emitting device of Embodiment 1 of this invention. FIG. 4 is a perspective view of the light-emitting device of the first embodiment. 5A is a front view of the light-emitting device of Embodiment 1, and FIG. 5B is a side view of the light-emitting device of Embodiment 1. FIG. 6A is a plan view of the light-emitting device of Embodiment 1, and FIG. 6B is a bottom view of the light-emitting device of Embodiment 1. FIG. FIG. 7A is a cross-sectional view including the support member 140 taken along the line AA shown in FIG. 5B, and FIG. 7B is a cross-sectional view taken along the line BB shown in FIG. 5A.

  As shown in FIGS. 4 to 7, the light emitting device 100 of the first embodiment includes a light emitting element 110 and a light flux controlling member 120. The light flux controlling member 120 includes a light flux controlling member main body 130 and a support member 140. The light flux controlling member main body 130 and the support member 140 are formed of the same material by integral molding. The material of the light flux controlling member main body 130 and the support member 140 is not particularly limited as long as it can transmit light having a desired wavelength. For example, the material of the light flux controlling member main body 130 and the support member 140 is a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), and epoxy resin (EP), or glass.

  The light emitting element 110 is a light source of the light emitting device 100. The light emitting element 110 is a light emitting diode (LED) such as a white light emitting diode. The light emitting element 110 is disposed in a recess 134 formed in the bottom of the light flux controlling member main body 130 (see FIGS. 7A and 7B).

  The light flux control member 120 (light flux control member main body 130) controls the traveling direction of the light emitted from the light emitting element 110. The light flux controlling member 120 (light flux controlling member main body 130) is arranged so that the central axis CA thereof coincides with the optical axis of the light emitting element 110 (see FIGS. 7A and 7B).

  As shown in FIGS. 7A and 7B, the light flux controlling member 120 (light flux controlling member main body 130) has an incident surface 131 on which light emitted from the light emitting element 110 is incident and a part of the light incident from the incident surface 131. It has a total reflection surface 132 that totally reflects, and an exit surface 133 that emits a part of the light incident from the incident surface 131 and the light reflected by the total reflection surface 132.

  The incident surface 131 is an inner surface of a recess 134 formed at the bottom of the light flux controlling member main body 130. The incident surface 131 is formed at a position facing the light emitting element 110 so as to intersect the central axis CA of the light flux controlling member 120 (light flux controlling member main body 130). The incident surface 131 is a rotationally symmetric surface with the central axis CA as the center. The incident surface 131 has an inner top surface 131 a that forms the top surface of the recess 134, and a tapered inner surface 131 b that forms the side surface of the recess 134. The inner surface 131b has an inner diameter that gradually increases from the inner top surface 131a toward the opening edge so that the inner diameter of the opening edge is larger than the inner diameter of the edge of the inner top surface 131a. .

  Total reflection surface 132 is a surface extending from the outer edge of the bottom of light flux controlling member main body 130 to the outer edge of emission surface 133. A flange may be provided between the outer edge of the total reflection surface 132 and the outer edge of the emission surface 133. The total reflection surface 132 is basically a rotationally symmetric surface formed so as to surround the central axis CA of the light flux controlling member 120. However, as will be described later, the total reflection surface 132 does not exist between the light flux controlling member main body 130 and the support member 140 (indicated by a broken line in FIG. 7A). The diameter of the total reflection surface 132 is gradually increased from the incident surface 131 side (bottom side) toward the output surface 133 side. The generatrix that constitutes the total reflection surface 132 is an arcuate curve convex outward (side away from the central axis CA) (see FIGS. 7A and 7B).

  The exit surface 133 is a conical surface having a vertex on the central axis CA of the light flux controlling member 120. The exit surface 133 is located on the opposite side of the entrance surface 131 in the light flux controlling member main body 130. Further, the emission surface 133 is formed so as to intersect with the central axis CA of the light flux controlling member 120.

  The support member 140 supports the light flux controlling member main body 130. As a result, the light flux controlling member main body 130 is disposed at an appropriate position on the substrate. A plurality of support members 140 are formed on the outer peripheral portion of the light flux controlling member main body 130. For example, the pair of support members 140 are formed on the outer peripheral portion of the light flux controlling member main body 130 so as to face each other. The outer peripheral portion of the light flux controlling member main body 130 includes a portion where the support member 140 is formed and a portion where the support member 140 is not formed.

  In light flux controlling member 120 of the first embodiment, a pair of support members 140 that are plane-symmetric with respect to a specific surface passing through central axis CA are arranged. The support member 140 supports the upper side portion of the light flux controlling member main body 130. There is no total reflection surface 132 between the support member 140 and the light flux controlling member main body 130 (indicated by a broken line in FIG. 7A).

When viewed in plan, light flux controlling member 120 of Embodiment 1 has a maximum outer diameter φ ₁ of the total reflection surface in the first direction larger than a maximum outer diameter φ ₂ of the total reflection surface in the second direction. (Φ ₁ > φ ₂ ). Here, the “first direction” and the “second direction” are both directions perpendicular to the central axis CA of the light flux controlling member 120 and perpendicular to each other. The support member 140 does not exist on the extension line of the maximum outer diameter φ1 in the _first direction. On the other hand, the support member 140 exists on the extension line of the maximum outer diameter φ2 in the _second direction. In other words, the pair of support members 140 face each other in the second direction.

FIG. 8 is a plan perspective view of the light emitting device 100 according to the first embodiment. For convenience of explanation, the total reflection surface 132 is hatched. As shown in FIG. 8, the light emitting device 100 of the first embodiment, in a plan view, the total reflective surface maximum outer diameter phi ₁ of the first direction D1 is, the total reflection surface in the second direction D2 greater than the maximum outer diameter phi ₂ of. This is because the total reflection surface 132 does not exist at the connection portion between the light flux controlling member main body 130 and the support member 140 (see FIG. 7A).

  FIG. 9 is a diagram illustrating light passage paths in the light-emitting device 100 according to the first embodiment. 9A corresponds to the cross-sectional view of FIG. 7A, and FIG. 9B corresponds to the cross-sectional view of FIG. 7B. The light emitted from the light emitting element 110 enters the light flux controlling member main body 130 from the incident surface (the inner top surface 131a or the inner side surface 131b). Among these, the light incident from the inner top surface 131 a directly reaches the emission surface 133 without being reflected by the total reflection surface 132. The light that directly reaches the emission surface 133 is emitted from the emission surface 133 toward the irradiated surface described later. On the other hand, light incident from the inner surface 131 b (light emitted from the light emitting element 110 at a large angle with respect to the central axis CA of the light flux controlling member 120) is reflected by the total reflection surface 132 and is centered on the light flux controlling member 120. The traveling direction is controlled so that the angle with respect to the axis CA is small. The light reflected by the total reflection surface 132 is also emitted from the emission surface 133 toward the irradiated surface described later (see FIG. 9B).

  As described above, the total reflection surface 132 does not exist between the light flux controlling member main body 130 and the support member 140. Therefore, part of the light incident from the inner side surface 131 b reaches the support member 140 without being reflected by the total reflection surface 132. This light passes through the support member 140 and is emitted in an oblique direction with respect to the central axis CA of the light flux controlling member 120 from the outer surface 141 of the support member (see FIG. 9A).

  As described above, in the light emitting device 100 of Embodiment 1, most of the light is emitted from the emission surface 133 of the light flux controlling member 120 in a direction substantially parallel to the central axis CA of the light flux controlling member 120 (FIG. 9A). , B). On the other hand, a part of the light passes through the support member 140 and is emitted from the outer surface 141 of the support member in an oblique direction with respect to the central axis CA of the light flux controlling member 120 (see FIG. 9A). The light emitted from the outer surface 141 of the support member 140 can illuminate the irradiated surface located near the light emitting device 100 and away from the central axis CA of the light flux controlling member 120.

[Configuration of lighting device]
Next, a lighting device including the light emitting device 100 of Embodiment 1 will be described. Here, an internal illumination type illumination device (for example, an internal illumination type signboard) will be described as a representative example of the illumination device of the present invention.

  FIG. 10 is a perspective view of the lighting apparatus 200 according to the first embodiment. FIG. 11 is a partially enlarged bottom view of the lighting apparatus 200 according to the first embodiment. In FIG. 11, the substrate 210 is omitted.

  As illustrated in FIGS. 10 and 11, the lighting device 200 includes a substrate 210, a plurality of light emitting devices 100, two irradiated surfaces 220 a and 220 b, and a top plate surface 230.

  The substrate 210 is a rectangular flat plate that forms the bottom surface of the lighting device 200. In the following description, the major axis direction of the substrate is referred to as “X axis”, and the minor axis direction is referred to as “Y axis”. Further, a direction perpendicular to the XY plane is defined as a “Z axis” (see FIG. 10).

  The plurality of light emitting devices 100 are fixed on the substrate 210 so as to be arranged in a line at regular intervals in the X-axis direction. The plurality of light emitting devices 100 are respectively arranged so that the support member 140 faces the X-axis direction (so as not to face the irradiated surfaces 220a and 220b). That is, the plurality of light emitting devices 100 are arranged such that the second direction D2 (see FIG. 8) and the X axis are parallel to each other.

  The irradiated surfaces 220a and 220b are rectangular flat plates that constitute the side surfaces of the lighting device 200. The irradiated surfaces 220a and 220b are arranged to face each other so as to be parallel to the XZ plane. For example, advertising characters and illustrations are drawn on the irradiated surfaces 220a and 220b.

  The top plate surface 230 is a rectangular flat plate that forms the top surface of the lighting device 200. The top plate surface 230 improves the brightness and illuminance distribution in the lighting device 200 by reflecting light emitted from the light emitting device 100.

  The illuminating device 200 is used by illuminating the irradiated surfaces 220a and 220b with light emitted from the light emitting device 100 disposed therein.

  As described above, in the illumination device 200 according to Embodiment 1, the plurality of light emitting devices 100 are arranged such that the second direction D2 and the X axis are parallel to each other. The light that has passed through the support member 140 can illuminate the irradiated surface located in the vicinity of the light emitting device 100 and away from the central axis CA of the light flux controlling member 120 in the second direction D2. Therefore, by arranging the light emitting device 100 so that the second direction D2 and the X axis are parallel, the light that has passed through the support member 140 is irradiated to the space between the light emitting devices 100, and thus the irradiated surface 220a. , B can suppress illuminance unevenness. That is, the region 34 between the light emitting devices 100 shown in FIG. 3B can also be illuminated. In addition, when the light emitting device 100 is arranged so that the second direction D2 and the Y axis are parallel, the light passing through the support member 140 is not irradiated to the space between the light emitting devices 100, and thus the irradiated surfaces 220a and 220b. It is not possible to suppress unevenness in illuminance.

  The position where the support member 140 is formed (angle θ shown in FIG. 11) is set according to the distance P between the centers of the light emitting devices 100 and the distance between the light emitting device 100 and the irradiated surfaces 220a and 220b.

  As shown in FIG. 12, it is assumed that a plurality of light emitting devices 100 are arranged between the irradiated surfaces 220a and 220b. Here, the center of the light emitting device 100 is O. Further, a position of the irradiated surface 220a that is closest to the light emitting element 100 is A, and a position that is separated from A by a distance V in the horizontal direction is B. The line segment OA is perpendicular to the irradiated surface 220a.

When the illuminance per unit area at position A is 1, the illuminance per unit area at position B is calculated. The illuminance at position B can be calculated using the inverse square law of illuminance and the incident angle cosine law of illuminance. The distance between AB when the illuminance of the position B of 0.8 and _{V 1,} the angle of the line segment OB for the segment OA and theta _1. Similarly, the distance between AB when the illuminance at position B is 0.5 is V _2, and the angle of line segment OB with respect to line segment OA is θ ₂ . V ₂ > V ₁ and θ ₂ > θ ₁ .

If the dark portion is generated in the irradiated surface 220a (see FIG. 3B), the following equation (1) is established between the central distance P and the distance V ₂ between the light emitting device 100.
P / 2> V ₂ (1)

On the other hand, if the total reflection surface lacking portion (boundary portion between the light flux controlling member main body 130 and the support member 140) is formed within the range of 0 <θ <θ _{1 under} the condition satisfying the above formula (1), the irradiated surface 220a The bright part will occur. Therefore, when satisfy | filling said Formula (1), it is preferable to form a total reflection surface lack part (connection part of the light beam control member main body 130 and the support member 140) in the range of (theta) ₁ <= (theta) <= 90 degree.

[effect]
The light emitting device 100 according to the first embodiment emits some light in an oblique direction from the outer surface 141 of the support member 140, not from the emission surface 133 of the light flux controlling member main body 130. Therefore, in the illuminating device 200 including the light emitting device 100, the light that has passed through the support member 140 can illuminate the space between the light emitting devices 100, and the illuminated surfaces 220a and 220b can be illuminated uniformly.

  Moreover, in the light emitting device 100 according to the first embodiment, the light flux controlling member main body 130 and the support member 140 are formed by integral molding, so that the size can be reduced. Therefore, when the light-emitting device 100 is used for an internal illumination type illumination device (for example, an internal illumination type signboard), the thickness of the internal illumination type illumination device can be reduced.

  As shown in FIG. 1, in the light emitting device 10 described in Patent Document 1, the exterior cover 15 holds a flange 14 disposed outside the total reflection surface 13. Therefore, the outer diameter of the light emitting device 10 becomes a value obtained by adding the thickness of the exterior cover 15 to the outer diameter of the total reflection surface 13 and becomes large. On the other hand, in the light emitting device 100 of the first embodiment, the light flux controlling member main body 130 and the support member 140 are formed by integral molding, and the support member 140 is attached at the expense of a part of the total reflection surface 132. Yes. Therefore, the outer diameter of the light emitting device 100 is substantially the same as the outer diameter of the light flux controlling member main body 130.

  In the above description, the example of the light flux control member in which the light in the second direction passes through the support member 140 has been described. However, the light flux control member of the present invention is not limited to this. For example, the light flux controlling member of the present invention may not have the support member 140. In this case, the light in the second direction not reflected by the total reflection surface 132 is emitted from the outer surface of the light flux controlling member main body 130 in an oblique direction without passing through the support member 140.

  In the above description, an example of an internal illumination device having two irradiated surfaces 220a and 220b has been described. However, the illumination device of the present invention is not limited to this. The illumination device of the present invention may be a double-sided internally illuminated illumination device having two irradiated surfaces 220a and 220b as shown in FIG. 13A, but as shown in FIG. It may be a single-sided internally illuminated illumination device having a single illuminated surface 220. In the latter case, the surface facing the irradiated surface 220 is preferably the reflecting surface 240. Further, the illumination device of the present invention may be an external illumination device as shown in FIG. 13C.

(Embodiment 2)
[Configuration of light emitting device]
14-17 is a figure which shows the structure of the light-emitting device of Embodiment 2 of this invention. FIG. 14 is a perspective view of the light emitting device of the second embodiment. 15A is a front view of the light emitting device of the second embodiment, FIG. 15B is a rear view of the light emitting device of the second embodiment, and FIG. 15C is a side view of the light emitting device of the second embodiment. . FIG. 16A is a plan view of the light-emitting device of Embodiment 2, and FIG. 16B is a bottom view of the light-emitting device of Embodiment 2. 17A is a cross-sectional view taken along line CC shown in FIG. 15C, and FIG. 17B is a cross-sectional view taken along line DD shown in FIGS. 15A and 15B. In addition, about the component same as the light-emitting device 100 of Embodiment 1 shown by FIGS. 4-7, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 14 to 17, the light emitting device 300 of the second embodiment includes a light emitting element 110 and a light flux controlling member 310. The light flux control member 310 includes a light flux control member main body 320 and a support member 140.

  The light flux control member 310 (light flux control member main body 320) controls the traveling direction of the light emitted from the light emitting element 110. The light flux controlling member 310 (light flux controlling member main body 320) is arranged so that the central axis CA thereof matches the optical axis of the light emitting element 110.

  As shown in FIGS. 17A and 17B, the light flux control member 310 (light flux control member main body 320) has an incident surface 321 on which the light emitted from the light emitting element 110 is incident and a part of the light incident from the incident surface 321. It has a total reflection surface 322 that totally reflects, and an exit surface 323 that emits a part of the light incident from the incident surface 321 and the light reflected by the total reflection surface 322. The light flux control member 310 (light flux control member main body 320) differs from the light emitting device 100 of Embodiment 1 only in the shape of the emission surface 323. The shapes of the incident surface 321 and the total reflection surface 322 are the same as those of the incident surface 321 and the total reflection surface 322 of the light emitting device 100 of the first embodiment. Therefore, the shape of the emission surface 323 will be described with reference to FIG.

  The emission surface 323 has a circular shape projected onto a plane (see FIG. 16A). As shown in FIG. 14, the emission surface 323 includes a vertex 323a, a first emission surface 323b, a ridge line 323c, a second emission surface 323d, and a third emission surface 323e. The vertex 323a is a point that is located at a predetermined height in the direction along the central axis CA from the center point of the circle projected on the plane and protrudes upward from the outer peripheral portion. The first emission surface 323b is a curved surface that is inclined from the apex 323a toward the outer periphery and is curved upward in a convex shape. The ridge line 323c is a straight line located at a predetermined height in the direction along the central axis CA from the diameter of the circle projected on the plane. The second emission surface 323d is a flat surface or a curved surface inclined from the ridge line 323c toward the outer peripheral portion. The third emission surface 323e is a plane formed by a step between the first emission surface 323b and the second emission surface 323d between the diameter of the circle projected on the plane and the ridgeline 323c.

  The first emission surface 323b is a substantially semi-conical surface formed with an angle range of 180 ° around the central axis CA. The first projected surface 323b has a semicircular shape projected onto the plane. The first emission surface 323b may be an aspheric surface.

  The second emission surface 323d is an inclined surface formed such that the end of the ridge line 323c has the same height as the apex, and the height gradually decreases toward the direction orthogonal to the ridge line 323c. For example, the second emission surface 323d is a cylindrical surface or a toric surface formed with an angle range of 180 ° around the central axis CA. In the case where the second exit surface 323d is a toric surface, in the cross section orthogonal to the central axis CA in the vicinity of the apex 323a, the line of intersection with the second exit surface 323d has a radius of curvature rather than the first exit surface 323b. It is preferable to be formed to be large.

  A pair of third emission surfaces 323e are formed. The pair of third emission surfaces 323e have a line-symmetric shape with the central axis CA as the center. When the first emission surface 323b is a semi-conical surface, the third emission surface 323e has a triangular shape and rises along the central axis CA.

  Light is emitted from the first emission surface 323b and the second emission surface 323d in a direction substantially parallel to the central axis CA of the light flux controlling member 310. The light emitted from the second emission surface 323d is emitted in a wider range than the light emitted from the first emission surface 323b. On the other hand, light is emitted from the third emission surface 323e in a direction substantially perpendicular to the central axis CA of the light flux controlling member 310.

[Configuration of lighting device]
Next, a lighting device including the light emitting device 300 of Embodiment 2 will be described. Here, an internal illumination type illumination device (for example, an internal illumination type signboard) will be described as a representative example of the illumination device of the present invention.

  FIG. 18 is a perspective view of lighting apparatus 400 according to the second embodiment. As illustrated in FIG. 18, the lighting device 400 includes a substrate 210, a plurality of light emitting devices 300, an irradiated surface 220, a top plate surface 230, and a reflecting surface 240. In FIG. 18, the same components as those of the lighting device 200 of Embodiment 1 shown in FIG. 10 are denoted by the same reference numerals, and the description thereof is omitted.

  The plurality of light emitting devices 300 are fixed on the substrate 210 so as to be arranged in a line at regular intervals in the X-axis direction. The plurality of light emitting devices 300 are arranged such that the support member 140 faces the X-axis direction (so as not to face the irradiated surface 220). In addition, each of the plurality of light emitting devices 300 is arranged such that the third emission surface 323 e faces the irradiated surface 220.

  The irradiated surface 220 is a rectangular flat plate that forms the side surface of the lighting device 400. The irradiated surface 220 is disposed so as to be parallel to the XZ plane. For example, advertising characters and illustrations are drawn on the illuminated surface 220.

  The top plate surface 230 is a rectangular flat plate that forms the top surface of the lighting device 400. The top surface 230 improves the brightness and illuminance distribution in the lighting device 400 by reflecting the light emitted from the light emitting device 300.

  The reflection surface 240 is a rectangular flat plate that forms the side surface of the lighting device 200. The reflective surface 240 is disposed so as to face the irradiated surface 220. The reflection surface 240 reflects light emitted from the light emitting device 300 (mainly light emitted from the second emission surface 323d) toward the irradiated surface 220.

  The illumination device 400 is used by illuminating the irradiated surface 220 with light emitted from the light emitting device 300 disposed therein.

[effect]
In addition to the effect of the light emitting device 100 of the first embodiment, the light emitting device 300 of the second embodiment can further improve the illuminance of the irradiated surface facing the third emission surface 323e. Therefore, the illumination device 400 including the light emitting device 300 can further improve the illuminance distribution of the irradiated surface 220.

  The light emitting device and the lighting device of the present invention can be applied to, for example, an internally illuminated signboard, an externally illuminated signboard, indirect illumination, and the like.

DESCRIPTION OF SYMBOLS 10 Light-emitting device 11 Light-emitting element 12 Total reflection lens 13 Total reflection surface 14 Flange 15 Exterior cover 20 Irradiated surface 22 Light source 30 Internally illuminated signboard 32 Display surface 100,300 Light-emitting device 110 Light-emitting element 120,310 Light flux control member 130,320 Light flux controlling member main body 131, 321 Incident surface 131a Inner top surface 131b Inner side surface 132, 322 Total reflection surface 133, 323 Outgoing surface 134 Recess 140 Support member 141 Outer surface of support member 200, 400 Illuminating device 210 Substrate 220, 220a, 220b Irradiated surface 230 Top plate surface 240 Reflecting surface 323a Vertex 323b First exit surface 323c Edge line 323d Second exit surface 323e Third exit surface CA Central axis

Claims (6)

A light flux controlling member for controlling the traveling direction of light emitted from the light emitting element,
An incident surface on which light emitted from the light emitting element is incident;
A total reflection surface that totally reflects a part of light incident from the incident surface;
A part of the light incident from the incident surface and an exit surface that emits the light reflected by the total reflection surface;
The incident surface is formed at a position facing the light emitting element so as to intersect the central axis of the light flux controlling member,
The exit surface is formed at a position opposite to the entrance surface so as to intersect the central axis of the light flux controlling member,
The total reflection surface surrounds the central axis of the light flux controlling member, and is formed so that the diameter gradually increases from the incident surface side toward the emission surface side,
When the light flux controlling member is viewed in plan, the maximum outer diameter φ ₁ of the total reflection surface in the first direction is larger than the maximum outer diameter φ ₂ of the total reflection surface in the second direction orthogonal to the first direction. Is also big,
Luminous flux control member. A pair of supporting members that support a light flux controlling member main body including the incident surface, the total reflection surface, and the exit surface;
The pair of support members are opposed to each other in the second direction,
The total reflection surface does not exist between the light flux controlling member main body and the support member,
A part of the light incident from the incident surface passes through the support member.
The light flux controlling member according to claim 1.   The light flux controlling member according to claim 2, wherein the light flux controlling member main body and the support member are formed by integral molding. The light flux controlling member according to any one of claims 1 to 3, and a light emitting element,
The light flux controlling member is a light emitting device arranged such that a central axis of the light flux controlling member coincides with an optical axis of the light emitting element. A light emitting device according to claim 4;
A planar irradiated surface irradiated with light from the light emitting device,
The light emitting device is disposed so that the second direction and the irradiated surface are parallel to each other.
Lighting device.   The lighting device according to claim 5, wherein the plurality of light emitting devices are arranged in a line on a straight line parallel to the irradiated surface.

Images