JP2019169423A - Light source device, and lighting device provided with the light source device - Google Patents

Abstract

To provide a light source device capable of increasing the amount of light irradiating the upper part and the side part of a lighting fixture without enlargement of a lens.SOLUTION: A light source device includes: a light emission substrate emitting light; and a lens provided in the emitting direction of the light emitted from the light emission substrate. The lens includes: a light incident concave part which faces the light emission substrate and into which the light from the light emission substrate is incident; an emission surface part located vertically below the light incident concave part and emitting the light incident from the light incident concave part to the emitting direction of the light emitted from the light emission substrate; and a whole reflection part fitted to the outer edge part of the emission surface part and entirely reflecting the light incident from the light incident concave part to the fitting side of the light emission substrate. The whole reflection part includes a plurality of projecting parts arraying in parallel in a vertical direction between the light emission substrate and the emission surface part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light source device using an LED (Light Emitting Diode) as a light source and an illumination device including the light source device.

  Conventionally, many lighting fixtures using LEDs (Light Emitting Diodes) as light sources have been proposed. And with the proposal of the lighting fixture using LED, various requests | requirements are made also to the light distribution of a lighting fixture. As one of the requirements, in addition to the direct illumination that illuminates the lower part of the luminaire, an indirect illumination function that illuminates the upper and side of the luminaire is added to maintain the illuminance necessary for the work, There is provision of lighting equipment that satisfies the sense of brightness. When such light distribution is realized, power consumption can be reduced as compared with the case where the entire room is illuminated brightly. In order to realize this light distribution, for example, an illuminating device including a light source and a lens is disclosed, and the lens adds light to the light emitted from the light source in addition to a refraction unit that emits light in the light emitting direction of the light source. An illuminating device having a reflecting portion that reflects light toward the light source has been proposed (see Patent Document 1). The lighting device of Patent Document 1 can illuminate not only the lower side of the lighting device but also the upper side and the side of the lighting device.

JP 2012-243641 A

  However, the illuminating device disclosed in Patent Document 1 reflects light toward the light source by a single reflecting surface. Therefore, in order to increase the amount of light that is incident on the reflecting surface and then reflects to the light source side, that is, the amount of light that illuminates the upper and side of the lighting fixture, it is necessary to increase the diameter of the reflecting surface. Therefore, in order to increase the amount of light that illuminates the upper and side of the lighting fixture, the lighting device needs to increase the size of the lens in order to increase the diameter of the reflecting surface.

  The present invention is to solve the above-described problems. In controlling light from a light source using a lens, the light that illuminates the upper and side of a lighting fixture without increasing the size of the lens. It is an object of the present invention to provide a light source device capable of increasing the amount, and an illumination device including the light source device.

  A light source device according to the present invention includes a light emitting substrate that emits light, and a lens that is provided in a direction in which the light emitted from the light emitting substrate is emitted. The lens faces the light emitting substrate, and light from the light emitting substrate is received. An incident light incident recess, an exit surface portion that is positioned below the incident light recess in the vertical direction and that emits light incident from the incident light recess in the exit direction of light emitted from the light emitting substrate, and an outer edge of the exit surface portion And a total reflection part that totally reflects the light incident from the light incident recess to the light emitting substrate installation side, and the total reflection part is vertically arranged between the light emitting substrate and the emission surface part. It has a plurality of protrusions arranged in parallel in the direction.

  The light source device according to the present invention includes a total reflection portion that reflects light incident from the light incident recess to the installation side of the light emitting substrate, and the total reflection portion includes a plurality of protrusions. And the light source device can totally reflect light according to the angle of the light radiate | emitted from a light emission board | substrate by the some protrusion part paralleled in the up-down direction. As a result, the light source device can increase the amount of light that illuminates the upper and side of the luminaire without increasing the size of the lens.

It is a disassembled perspective view of the light source device which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional schematic diagram of the light source device which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional schematic diagram which shows the path | route of the light in the light source device of FIG. It is a longitudinal cross-sectional schematic diagram of the light source device which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional schematic diagram which shows the path | route of the light in the light source device of FIG. It is a disassembled perspective view of the light source device which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional schematic diagram of the light source device which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional schematic diagram which shows the path | route of the light in the light source device of FIG. It is a perspective view which shows the illuminating device which concerns on Embodiment 4 of this invention.

  Hereinafter, a light source device according to an embodiment of the present invention will be described with reference to the drawings. In the following drawings including FIG. 1, the relative dimensional relationship and shape of each component may be different from actual ones. In the following drawings, the same reference numerals denote the same or corresponding parts, and this is common throughout the entire specification. In addition, in order to facilitate understanding, terms representing directions or positions (for example, “up”, “down”, “right”, “left”, “front”, “back”, etc.) are used as appropriate. However, these notations are merely described as such for convenience of explanation, and do not limit the arrangement and orientation of the apparatus or components. In each drawing described below, the z-axis indicates the vertical direction, the x-axis indicates the left-right direction, that is, the horizontal direction, and the y-axis indicates the front-back direction, that is, the depth direction. The x-axis, y-axis, and z-axis are orthogonal to each other, the x-axis and the y-axis are horizontal directions, and the z-axis is a vertical direction. Further, the direction in which the arrows on the x-axis, y-axis, and z-axis are directed is the positive direction, and the direction opposite to the direction in which each arrow is directed is the negative direction.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of a light source device 1 according to Embodiment 1 of the present invention. First, the overall configuration of the light source device 1 will be described with reference to FIG.

[Light source device 1]
The light source device 1 emits light by controlling light distribution. The light source device 1 includes a light emitting substrate 10 and a lens 20. The light source device 1 also includes a housing 15 that houses the light emitting substrate 10 and to which the lens 20 is attached.

(Light emitting substrate 10)
The light emitting substrate 10 includes a light emitting unit 11 and a substrate 12. The light emitting portion 11 of the light emitting substrate 10 is a portion that emits light, and is configured by, for example, an LED (Light Emitting Diode). For example, the light emitting unit 11 is provided with a phosphor that converts blue light into yellow light on an LED chip that emits blue light of about 440 nm to 480 nm, and emits white light as synthesized light. The light emitting unit 11 is mounted on the substrate 12. This substrate 12 is, for example, a plate-like aluminum substrate. A circuit pattern for supplying power is formed on the substrate 12, and elements such as a diode (not shown) in addition to the light emitting unit 11 are mounted as necessary. The substrate 12 is connected to a power source (not shown) via a wire 13 and a connector 14.

(Case 15)
The housing 15 accommodates the light emitting substrate 10, the wire 13, and the connector 14. The light emitting unit 11 and the lens 20 are positioned by the housing 15, and the optical axis L <b> 1 of the light emitting unit 11 constituting the light emitting substrate 10 and the central axis P of the lens 20 coincide with each other or substantially coincide with each other. The optical axis L1 is the axis of light emitted in the direction perpendicular to the light emitting substrate 10.

(Lens 20)
The lens 20 is a member that covers the light emitting unit 11 and changes the direction of light emitted from the light emitting unit 11. The lens 20 is provided in the emission direction of the light emitted from the light emitting substrate 10 with respect to the light emitting substrate 10. The lens 20 is a rotating body with the optical axis L1 passing through the center of the light emitting substrate 10 in the vertical direction of the light emitting substrate 10 as the center. The lens 20 is made of a transparent material such as acrylic resin, polycarbonate resin, or glass. For example, a light diffusing process may be performed on all or at least a part of the surface of the lens 20 by forming an uneven shape such as embossing. By subjecting the lens 20 to the light diffusion treatment, the irradiation image can be relaxed and the uneven color of the irradiation surface can be improved.

  FIG. 2 is a schematic longitudinal sectional view of the light source device 1 according to Embodiment 1 of the present invention. The lens 20 is opposed to the light emitting substrate 10, and has a light incident recess 21 in which light emitted from the light emitting unit 11 of the light emitting substrate 10 enters the lens 20. Further, the lens 20 transmits the light emitted from the light emitting unit 11 and incident from the light incident recess 21 in the light emitting direction (z-axis positive direction) of the light emitting unit 11 of the light emitting substrate 10, so that the lens 20 It has the output surface part 22 which radiate | emits outside. The exit surface portion 22 is located below the light incident recess 21 in the vertical direction. The lens 20 includes a total reflection unit 2 that totally reflects light emitted from the light emitting unit 11 and incident from the light incident recess 21 toward the installation side of the light emitting substrate 10 (z-axis negative direction). Further, the lens 20 includes a small angle reflecting surface portion 31 that totally reflects the light emitted from the light emitting portion 11 of the light emitting substrate 10 in the light emitting direction (z-axis positive direction) of the light emitting portion 11. The lens 20 has a positioning part 32 provided for positioning with the light emitting part 11. Total reflection is a phenomenon in which when light enters a medium with a low refractive index from a medium with a high refractive index, if the incident angle is larger than a certain angle (critical angle), the light is totally reflected at the boundary surface. Say.

(Light incident recess 21)
The light entrance recess 21 is a portion that is recessed toward the inside of the lens 20 at the center of the ceiling wall 20 a on the upper side of the lens 20. The light incident recess 21 is formed of a curved surface. More specifically, the light incident concave portion 21 is disposed at a position facing the light emitting portion 11 of the light emitting substrate 10 and is formed so as to constitute a part of a spherical surface centering on the center Q of the light emitting surface of the light emitting substrate 10. ing. Note that the ceiling wall 20 a is formed in a circular shape in a plan view in the vertical direction with respect to the light emitting substrate 10.

(Exit surface 22)
The emission surface portion 22 is a portion that is provided below the light incident recess 21 in the vertical direction and is formed in a plane that is substantially perpendicular to the optical axis L1 of the light emitting portion 11. Further, the emission surface portion 22 is formed in a circular shape in a plan view in the direction perpendicular to the light emitting substrate 10.

(Total reflection part 2)
The total reflection portion 2 is provided on the outer edge portion 22 a of the emission surface portion 22. Further, the total reflection portion 2 is provided between the ceiling wall 20 a and the emission surface portion 22. The total reflection portion 2 includes a plurality of protrusions 3 arranged in parallel in the vertical direction between the light emitting substrate 10 and the emission surface portion 22. The plurality of protrusions 3 protrude to the side of the lens 20. Since the lens 20 is a rotating body, the protruding portion 3 protrudes in the circumferential direction and is formed in an annular shape. In addition, the plurality of protrusions 3 have a curved shape that is convex in the emission direction of light emitted from the light emitting substrate 10. The some protrusion part 3 has the 1st protrusion part 3a and the 2nd protrusion part 3b. In other words, the total reflection part 2 has the side wall part 27 and the 1st protrusion part 3a and the 2nd protrusion part 3b which protrude from the side wall part 27 to the side. The first protrusion 3a and the second protrusion 3b are each formed in an annular shape. The 1st protrusion part 3a and the 2nd protrusion part 3b are arranged in the up-down direction, and the 2nd protrusion part 3b is formed above the 1st protrusion part 3a.

  The side wall portion 27 is a side wall of the lens 20 that connects a first connection surface portion 25 described later and a second reflection surface portion 28 described later, and forms a surface substantially parallel to the optical axis L1.

  The first projecting portion 3a has a first reflecting surface portion 23 that totally reflects the light emitted from the light emitting portion 11 and incident from the light incident recess 21 toward the installation side of the light emitting substrate 10 (z-axis negative direction). The first reflecting surface portion 23 forms part of the bottom wall of the lens 20 continuously with the emitting surface portion 22. The first protrusion 3 a has a first emission surface 24 that transmits the light totally reflected by the first reflection surface 23 and emits the light to the outside of the lens 20. The first emission surface portion 24 is located at the outer edge lower end portion 23 a of the first reflection surface portion 23 and forms a part of the side wall of the lens 20. Further, the first projecting portion 3 a has a first connecting surface portion 25 that faces the second reflecting surface portion 28. The first connection surface portion 25 is formed between the upper end portion 24 a of the first emission surface portion 24 and the side wall portion 27.

  The first reflecting surface portion 23 has a shape obtained by rotating a free curve convex in the light emitting direction (z-axis positive direction) from the light emitting portion 11 once around the optical axis L1 as a rotation axis. The first reflecting surface portion 23 has a tangential slope at the first reflecting surface portion 23 so that the light that has reached the first reflecting surface portion 23 is totally reflected and changes its direction toward the installation side of the light emitting substrate 10 (z-axis negative direction). Is defined to form a curved surface. The first emission surface portion 24 forms a surface substantially parallel to the optical axis L1. The first connection surface portion 25 is formed in the same shape as the first reflection surface portion 23 in the longitudinal sectional view.

  The 2nd protrusion part 3b has the 2nd reflective surface part 28 which totally reflects the light radiate | emitted from the light emission part 11, and entered from the light-incidence recessed part 21 to the installation side (z-axis negative direction) of the light emission board | substrate 10. FIG. The second reflection surface portion 28 is formed between the side wall portion 27 and a second emission surface portion 29 described later, and faces the first connection surface portion 25. The second protrusion 3 b has a second emission surface 29 that transmits the light totally reflected by the second reflection surface 28 and emits the light to the outside of the lens 20. The second emission surface portion 29 is located at the outer edge lower end portion 28 a of the second reflection surface portion 28 and forms a part of the side wall of the lens 20. Furthermore, the 2nd protrusion part 3b has the upper surface part 30 formed between the upper end part 29a of the 2nd output surface part 29, and the ceiling wall 20a.

  The second reflecting surface portion 28 has a shape obtained by rotating the free curve convex in the light emission direction (z-axis positive direction) by the light emitting portion 11 once with the optical axis L1 as the rotation axis. The second reflecting surface portion 28 has a curved surface with a tangential slope in the second reflecting surface portion 28 determined so that the light that has reached the second reflecting surface portion 28 is totally reflected and changes its direction toward the installation side of the light emitting substrate 10. Is formed. Here, the inclination of the tangent line on the longitudinal section of the second reflecting surface portion 28 and the first connecting surface portion 25 is examined on the xz coordinate in the figure. On the longitudinal section of the second reflecting surface portion 28, a tangent at an arbitrary point B1 on the second reflecting surface portion 28 is defined as a tangent Z = αX + b1. In FIG. 2, the dotted line passing through the point B1 is the tangent Z = αX + b1. Further, on the longitudinal section of the first connection surface portion 25, the tangent at the point C1 on the first connection surface portion 25 is defined as tangent Z = βX + b2. In FIG. 2, the dotted line passing through the point C1 is the tangent Z = βX + b2. The point C1 is a position on the longitudinal section of the first connection surface portion 25 where the horizontal distance between the point C1 and the optical axis L1 is equal to the horizontal distance between the point B1 and the optical axis L1. This is a point. As described above, when the direction of the x-axis and z-axis arrows is the positive direction, the slope α of the tangent Z = αX + b1 at an arbitrary point B1 on the second reflecting surface portion 28 has a negative value. On the other hand, the slope β of the tangent Z = βX + b2 at the point C1 on the first connection surface portion 25 is a positive value. Therefore, the magnitude relationship between the tangential slope α and the tangential slope β on the curved surfaces of the second reflecting surface portion 28 and the first connecting surface portion 25 is β> α at any point on the curved surface. That is, as shown in FIG. 2, the thickness of the side concave portion 26 formed by the first connection surface portion 25, the second reflection surface portion 28, and the side wall portion 27 increases as the distance from the optical axis L1 increases. In other words, the distance between the first connection surface portion 25 and the second reflection surface portion 28 increases as the distance from the optical axis L1 increases. That is, the total reflection portion 2 is formed such that the distance between the plurality of protrusions 3 increases with increasing distance from the optical axis L1 with respect to the vertical optical axis L1 of the light emitting substrate 10. Further, the side recess 26 is located on the side where the light emitting substrate 10 is installed (z) from the line segment L2 connecting the center Q of the light emitting substrate 10 and the outermost point A1 located at the outer edge lower end portion 23a of the first reflecting surface portion 23. It is located in the negative axis direction. That is, the side wall portion 27 located between the plurality of protruding portions 3 is from a line segment L2 connecting the center Q of the light emitting substrate 10 and the outermost point A1 located at the outer edge lower end portion 23a of the first reflecting surface portion 23. Is also located on the light emitting substrate 10 installation side (z-axis negative direction). The first projecting portion 3 a is located closer to the emission surface portion 22 than the side wall portion 27.

  The second emission surface portion 29 forms a surface substantially parallel to the optical axis L1. The upper surface portion 30 constitutes a surface that connects the second emission surface portion 29 and the small-angle reflection surface portion 31, and has a mortar shape whose diameter increases in the direction of light emission by the light emitting portion 11 (z-axis positive direction). Shape.

  The small angle reflection surface portion 31 is provided on the outer edge portion 20a1 of the ceiling wall 20a. The small-angle reflecting surface portion 31 has a shape in which a free curve convex on the installation side (z-axis negative direction) of the light emitting substrate 10 is rotated once with the optical axis L1 as a rotation axis. The small angle reflection surface portion 31 faces the first reflection surface portion 23 in a direction parallel to the optical axis L1. Further, the small-angle reflecting surface portion 31 faces the light incident concave portion 21 in a direction perpendicular to the optical axis L1. The small angle reflecting surface portion 31 totally reflects the light emitted from the light emitting portion 11 and reaches the small angle reflecting surface portion 31, and changes the direction to the emitting direction (z-axis positive direction) of the light emitted by the light emitting portion 11. In addition, the slope of the tangent line in the small angle reflecting surface portion 31 is determined to form a curved surface.

  The positioning portion 32 is formed in a concave shape, and is in a fitting relationship with the convex shape portion 15 a provided in the housing 15. The positioning unit 32 positions the lens 20 with respect to the light emitting unit 11. In addition, the shape of the 1st reflective surface part 23 mentioned above, the 1st connection surface part 25, the 2nd reflective surface part 28, and the small angle reflective surface part 31 is not specifically limited, For example, a paraboloid shape, an elliptical surface shape, a spherical surface It may be a shape or the like.

  FIG. 3 is a schematic longitudinal sectional view showing a light path in the light source device 1 of FIG. Next, in the light source device 1 according to Embodiment 1, the path of light emitted from the center Q of the light emitting substrate 10 will be described. Note that a path of light emitted with different angles from the reference line will be described using a line perpendicular to the optical axis L1 (x-axis direction) as a reference line, that is, a line with an angle of 0 degrees. For example, the direction of the optical axis L1 (z-axis direction) is an angle of 90 degrees from the reference line.

  First, the path of the small-angle light a1 having the smallest angle from the reference line will be described. As shown in FIG. 3, the small angle light a <b> 1 emitted from the center Q of the light emitting substrate 10 is light distribution controlled by the small angle reflection surface portion 31. More specifically, the small angle light a <b> 1 emitted from the center Q of the light emitting substrate 10 enters the lens 20 from the light incident recess 21. At this time, since the light incident recess 21 is a spherical surface centered on the center Q of the light emitting substrate 10, the small-angle light a <b> 1 reaches the small-angle reflection surface portion 31 without being refracted, and the small-angle reflection surface portion 31 After being totally reflected, it passes through the side recess 26. When the small-angle light a <b> 1 passes through the side recess 26, a part of the light is Fresnel reflected, but most of the light reaches the first reflecting surface portion 23 while being refracted. The small-angle light a1 that has reached the first reflecting surface portion 23 is transmitted through the first reflecting surface portion 23 while being refracted, and is emitted in the emission direction (z-axis positive direction) of the light emitted by the light emitting portion 11.

  Next, a description will be given of the path of the medium angle light b1 in the first half of the angle from the reference line. As shown in FIG. 3, the light distribution of the medium angle light b <b> 1 is controlled by the second reflecting surface portion 28. More specifically, the medium angle light b <b> 1 emitted from the center Q of the light emitting substrate 10 enters the lens 20 from the light incident recess 21. At this time, since the light incident recess 21 is a spherical surface centered on the center Q of the light emitting substrate 10, the medium angle light b1 reaches the second reflecting surface portion 28 without being refracted. The medium-angle light b <b> 1 that has reached the second reflecting surface portion 28 is totally reflected by the second reflecting surface portion 28 and then reaches the second emitting surface portion 29. The medium-angle light b <b> 1 that has reached the second emission surface portion 29 is transmitted through the second emission surface portion 29 while being refracted, and is emitted to the outside from the side of the lens 20.

  Next, the path of the medium angle light c1 whose angle from the reference line is medium and the latter half will be described. As shown in FIG. 3, the medium angle light c <b> 1 is subjected to light distribution control by the first reflecting surface portion 23. More specifically, the medium angle light c <b> 1 emitted from the center Q of the light emitting substrate 10 enters the lens 20 from the light incident recess 21. At this time, since the light incident concave portion 21 is a spherical surface centered on the center Q of the light emitting substrate 10, the medium angle light c1 reaches the first reflecting surface portion 23 without being refracted. The medium-angle light c <b> 1 that has reached the first reflection surface portion 23 is totally reflected by the first reflection surface portion 23 and then reaches the first emission surface portion 24. The medium-angle light c <b> 1 that has reached the first emission surface portion 24 is transmitted through the first emission surface portion 24 while being refracted, and is emitted to the outside from the side of the lens 20.

  A path of the large-angle light d1 having the largest angle from the reference line will be described. As shown in FIG. 3, the light distribution of the large angle light d <b> 1 is controlled by the emission surface portion 22. More specifically, the large-angle light d 1 emitted from the center Q of the light emitting substrate 10 enters the lens 20 from the light incident recess 21. At this time, since the light incident recess 21 is a spherical surface centered on the center Q of the light emitting substrate 10, the large-angle light d1 reaches the emission surface 22 without being refracted. The large-angle light d1 that has reached the emission surface portion 22 is transmitted through the emission surface portion 22 while being refracted, and is emitted in the emission direction (z-axis positive direction) of the light emitted by the light emitting portion 11.

  Finally, effects of the light source device 1 according to Embodiment 1 will be described. The light source device 1 includes a total reflection portion 2 that reflects light incident from the light incident recess 21 toward the installation side of the light emitting substrate 10, and the total reflection portion 2 includes a plurality of protrusions 3. And the light source device 1 can totally reflect light according to the angle of the light radiate | emitted from the light emission board | substrate 10 with the some protrusion part 3 paralleled in the up-down direction. As a result, the light source device 1 can increase the amount of light that illuminates the upper and side of the lighting fixture without increasing the size of the lens.

  In the light source device 1, the plurality of protrusions 3 have a curved shape that is convex in the emission direction of light emitted from the light emitting substrate 10. Therefore, the light emitted from the light emitting substrate 10 can be converged on the installation side of the light emitting substrate 10 and totally reflected.

  The total reflection portion 2 is formed such that the distance between the plurality of protrusions 3 increases with increasing distance from the optical axis L1 with respect to the vertical optical axis L1 of the light emitting substrate 10. The light source device 1 totally reflects light toward the installation side (z-axis negative direction) of the light emitting substrate 10 using the two reflection surfaces of the first reflection surface portion 23 and the second reflection surface portion 28. . Therefore, the light source device 1 emits light emitted toward the light emitting unit 11 side (z-axis negative direction) without increasing the diameter of the lens 20 as compared with a light source device having a lens having only one reflecting surface. Can be increased.

  Further, the side concave portion 26 located between the plurality of protrusions 3 is a line connecting the outermost point A1 located at the outer edge lower end portion 23a of the first reflecting surface portion 23 and the center Q of the light emitting surface of the light emitting portion 11. It arrange | positions rather than the part L2 at the installation side (z-axis negative direction side) of the light emission board | substrate 10. FIG. Therefore, the light source device 1 does not block the light reaching the first reflecting surface portion 23 by the side surface recess 26. As a result, the light source device 1 can reduce the size of the optical system without impairing the performance of the lens 20.

  Moreover, in the LED light source used for a general lighting fixture, light distribution is continuing from the front of a board | substrate to the back of a board | substrate, and the area | region where light is not irradiated does not exist among them. For this reason, light may also be irradiated to a region where the emission angle that people feel as unpleasant glare is shallow. In the light source device 1 of the first embodiment, the total reflection portion 2 is such that the plurality of protrusions 3 are separated from each other with respect to the optical axis L1 in the vertical direction of the light emitting substrate 10 as the distance from the optical axis L1 increases. Is formed. At this time, the inclination α of the tangent Z = αX + b1 of the point B1 on the second reflecting surface portion 28 on the longitudinal section of the second reflecting surface portion 28 and the first connecting surface portion 25 on the xz coordinate is on the first connecting surface portion 25. The tangent Z of the point C1 is smaller than the inclination β of βX + b2. Therefore, even in the medium angle light b1 having a shallow emission angle compared to the medium angle light c1, the direction can be effectively changed to the installation side (z-axis negative direction) of the light emitting substrate 10, and the effect of reducing glare is achieved. is there. Further, the small-angle light a1 having a shallower emission angle than the medium-angle light b1 is partially reflected by the small-angle reflecting surface portion 31, thereby emitting the light emitted by the light-emitting portion 11 (z-axis positive). Direction), which has the effect of reducing glare.

Embodiment 2. FIG.
FIG. 4 is a schematic longitudinal sectional view of the light source device 100 according to Embodiment 2 of the present invention. Hereinafter, the configuration of the light source device 100 according to Embodiment 2 will be described with reference to FIG. The light source device 100 according to the second embodiment is different from the light source device 1 according to the first embodiment in that there are three protrusions 3 in the total reflection portion 102 of the lens 120. The light source device 100 according to the second embodiment will be described with a focus on the differences from the light source device 1 while omitting the description of the same parts as those of the light source device 1 according to the first embodiment with the same reference numerals. In addition, you may perform a light-diffusion process by forming uneven | corrugated shape, such as embossing, on all or at least one part of the surface of the lens 120, for example. By subjecting the lens 120 to a light diffusion treatment, the irradiation image can be relaxed and the uneven color of the irradiation surface can be improved.

(Total reflection part 102)
In the light source device 100 according to Embodiment 2, the total reflection unit 102 includes a third protrusion 3 c in addition to the components of the total reflection unit 2 of the light source device 1. That is, the total reflection part 102 has the side wall part 27, the 1st protrusion part 3a which protrudes from the side wall part 27 to the side, the 2nd protrusion part 3b, and the 3rd protrusion part 3c. The 1st protrusion part 3a, the 2nd protrusion part 3b, and the 3rd protrusion part 3c are each formed in cyclic | annular form. The first protrusion 3a, the second protrusion 3b, and the third protrusion 3c are arranged in the vertical direction, and the second protrusion 3b is formed above the first protrusion 3a. The third protrusion 3c is formed above the second protrusion 3b.

  The side wall part 27 is formed between the first side wall part 27a formed between the first projecting part 3a and the second projecting part 3b, and between the second projecting part 3b and the third projecting part 3c. A second side wall portion 27b. The first side wall portion 27a is a side wall of the lens 120 that connects the first connection surface portion 25 and the second reflection surface portion 28, and forms a surface substantially parallel to the optical axis L1. The second side wall portion 27b is a side wall of the lens 120 that connects a second connection surface portion 40 described later and the third reflection surface portion 43, and forms a surface substantially parallel to the optical axis L1.

  The first projecting portion 3a has a first reflecting surface portion 23 that totally reflects the light emitted from the light emitting portion 11 and incident from the light incident recess 21 toward the installation side of the light emitting substrate 10 (z-axis negative direction). The first reflecting surface portion 23 forms part of the bottom wall of the lens 20 continuously with the emitting surface portion 22. The first protrusion 3 a has a first emission surface 24 that transmits the light totally reflected by the first reflection surface 23 and emits the light to the outside of the lens 20. The first emission surface portion 24 is located at the outer edge lower end portion 23 a of the first reflection surface portion 23 and forms a part of the side wall of the lens 20. Further, the first projecting portion 3 a has a first connecting surface portion 25 that faces the second reflecting surface portion 28. The first connection surface portion 25 is formed between the upper end portion 24 a of the first emission surface portion 24 and the side wall portion 27.

  The 2nd protrusion part 3b has the 2nd reflective surface part 28 which totally reflects the light radiate | emitted from the light emission part 11, and entered from the light-incidence recessed part 21 to the installation side (z-axis negative direction) of the light emission board | substrate 10. FIG. The second reflection surface portion 28 is formed between the first side wall portion 27 a and the second emission surface portion 29 and faces the first connection surface portion 25. The second protrusion 3 b has a second emission surface 29 that transmits the light totally reflected by the second reflection surface 28 and emits the light to the outside of the lens 20. The second emission surface portion 29 is located at the outer edge lower end portion 28 a of the second reflection surface portion 28 and forms a part of the side wall of the lens 20. Furthermore, the 2nd protrusion part 3b has the 2nd connection surface part 40 facing the 3rd reflective surface part 43 mentioned later. The third reflecting surface portion 43 is formed between the upper end portion 29a of the second emitting surface portion 29 and the second side wall portion 27b.

  The second reflecting surface portion 28 has a shape obtained by rotating the free curve convex in the light emission direction (z-axis positive direction) by the light emitting portion 11 once with the optical axis L1 as the rotation axis. The second reflecting surface portion 28 has a curved surface with a tangential slope in the second reflecting surface portion 28 determined so that the light that has reached the second reflecting surface portion 28 is totally reflected and changes its direction toward the installation side of the light emitting substrate 10. Is formed. The thickness of the side recess 26 formed by the first connecting surface portion 25, the second reflecting surface portion 28, and the first side wall portion 27a increases as the distance from the optical axis L1 increases. That is, the distance between the first connection surface portion 25 and the second reflection surface portion 28 increases as the distance from the optical axis L1 increases. That is, the total reflection portion 2 is formed such that the distance between the plurality of protrusions 3 increases with increasing distance from the optical axis L1 with respect to the vertical optical axis L1 of the light emitting substrate 10. The second emission surface portion 29 forms a surface substantially parallel to the optical axis L1. The second connection surface portion 40 is formed in the same shape as the second reflection surface portion 28 in a longitudinal sectional view.

  The third protrusion 3c has a third reflecting surface portion 43 that totally reflects the light emitted from the light emitting portion 11 and incident from the light incident recess 21 toward the installation side of the light emitting substrate 10 (z-axis negative direction). The third reflection surface portion 43 is formed between the second side wall portion 27 b and a third emission surface portion 44 described later, and faces the second connection surface portion 40. Further, the third protrusion 3 c has a third emission surface portion 44 that transmits the light totally reflected by the third reflection surface portion 43 and emits the light to the outside of the lens 20. The third emission surface portion 44 is located at the outer edge lower end portion 43 a of the third reflection surface portion 43 and forms a part of the side wall of the lens 20. Further, the third projecting portion 3 c has an upper surface portion 130 formed between the upper end portion 44 a of the third emission surface portion 44 and the ceiling wall 20 a.

  The third reflecting surface portion 43 has a shape in which a free curve convex in the light emitting direction (z-axis positive direction) of the light emitting portion 11 is rotated once about the optical axis L1 as a rotation axis. The third reflection surface portion 43 has a curved surface with a tangential slope in the third reflection surface portion 43 determined so that the light reaching the third reflection surface portion 43 is totally reflected and changes the direction to the installation side of the light emitting substrate 10. Is formed. Here, the inclination of the tangent on the longitudinal section of the third reflecting surface portion 43 and the second connecting surface portion 40 is examined on the xz coordinate in the figure. On the longitudinal section of the third reflecting surface portion 43, a tangent at an arbitrary point B2 on the third reflecting surface 43 is defined as tangent Z = γX + b1. In FIG. 4, the dotted line passing through the point B2 is a tangent Z = γX + b1. Further, on the longitudinal section of the second connection surface portion 40, the tangent at the point C2 on the second connection surface portion 40 is defined as tangent Z = ηX + b2. In FIG. 4, the dotted line passing through the point C2 is the tangent Z = ηX + b2. In addition, the point C2 is a position where the horizontal distance between the point C2 and the optical axis L1 is equal to the horizontal distance between the point B2 and the optical axis L1 on the longitudinal section of the second connection surface portion 40. This is a point. As described above, when the direction of the x-axis and z-axis arrows is the positive direction, the slope γ of the tangent Z = γX + b1 at an arbitrary point B2 on the third reflecting surface portion 43 becomes a negative value. Further, the slope η of the tangent Z = ηX + b2 at the point C2 on the second connection surface portion 40 is also a negative value. As shown in FIG. 4, the tangent slope γ at the point B2 is larger in the negative direction than the tangential slope η at the point C2. Therefore, the magnitude relationship between the tangential slope γ and the tangential slope η on the curved surfaces of the third reflecting surface portion 43 and the second connecting surface portion 40 is η> γ at any point on the curved surface. That is, as shown in FIG. 4, the thickness of the second side surface concave portion 41 formed by the second connection surface portion 40, the third reflection surface portion 43, and the second side wall portion 27b increases as the distance from the optical axis L1 increases. . In other words, the distance between the second connection surface portion 40 and the third reflection surface portion 43 increases as the distance from the optical axis L1 increases. That is, the total reflection portion 2 is formed such that the distance between the plurality of protrusions 3 increases with increasing distance from the optical axis L1 with respect to the vertical optical axis L1 of the light emitting substrate 10. Furthermore, the second side recess 41 is located on the side where the light emitting substrate 10 is installed, rather than the line segment L3 connecting the center Q of the light emitting substrate 10 and the outermost point A2 located at the outer edge lower end portion 28a of the second reflecting surface portion 28. Located in the negative z-axis direction. That is, the second side wall portion 27b located between the plurality of protrusions 3 is a line segment connecting the center Q of the light emitting substrate 10 and the outermost point A2 located at the outer edge lower end portion 28a of the second reflecting surface portion 28. It is located on the installation side (z-axis negative direction) of the light emitting substrate 10 with respect to L3. In addition, the 2nd protrusion part 3b is located in the output surface part 22 side rather than the 2nd side wall part 27b.

  The third emission surface portion 44 forms a surface substantially parallel to the optical axis L1. The upper surface portion 130 constitutes a surface connecting the third emission surface portion 44 and the ceiling wall 20a, and forms a plane substantially perpendicular to the optical axis L1. In addition, the shape of the 3rd reflective surface part 43 mentioned above is not specifically limited, For example, a paraboloid shape, an ellipsoid shape, a spherical shape etc. may be sufficient.

  FIG. 5 is a schematic longitudinal sectional view showing a light path in the light source device 100 of FIG. Next, in the light source device 100 according to Embodiment 2, the path of light emitted from the center Q of the light emitting substrate 10 will be described. Note that a path of light emitted at different angles from the reference line will be described with a line perpendicular to the optical axis L1 (x-axis direction) as a reference line, that is, a line with an angle of 0 degrees. For example, the direction of the optical axis L1 (z-axis direction) is an angle of 90 degrees from the reference line.

  In the light source device 100 according to the second embodiment, the path of the small-angle light a2 is different from that of the light source device 1 according to the first embodiment. As shown in FIG. 5, the light distribution of the small angle light a <b> 2 is controlled by the third reflecting surface portion 43. More specifically, the small angle light a <b> 2 emitted from the center Q of the light emitting substrate 10 enters the lens 20 from the light incident recess 21. At this time, since the light incident recess 21 is a spherical surface centered on the center Q of the light emitting substrate 10, the small angle light a2 reaches the third reflecting surface portion 43 without being refracted. The small-angle light a <b> 2 that has reached the third reflecting surface portion 43 is totally reflected by the third reflecting surface portion 43 and then reaches the third emitting surface portion 44. The small-angle light a <b> 2 that has reached the third emission surface portion 44 is transmitted through the third emission surface portion 44 while being refracted, and is emitted to the outside from the side of the lens 20.

  Finally, effects of the light source device 100 according to Embodiment 2 will be described. The light source device 100 according to Embodiment 2 totally reflects the light incident from the light incident concave portion 21 toward the installation side of the light emitting substrate 10 and the light totally reflected by the third reflecting surface portion 43. And a third emission surface portion 44 that is transmitted and emitted to the outside of the lens 20. In the light source device 100, light emitted from the light emitting unit 11 at a small angle is subjected to light distribution control using the third reflecting surface portion 43. For this reason, the light source device 100 can increase the light emitted toward the installation side (z-axis negative direction) of the light emitting unit 11 while reducing the glare.

Embodiment 3 FIG.
FIG. 6 is an exploded perspective view of light source device 200 according to Embodiment 3 of the present invention. Hereinafter, the configuration of the light source device 200 according to Embodiment 3 will be described with reference to FIG. In the light source device 200 according to the third embodiment, portions common to the light source device 1 according to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the light source device 1 are mainly described. As illustrated in FIG. 6, the light source device 200 includes a light emitting substrate 210, a housing 215, and a lens 220.

(Light emitting substrate 210)
The light emitting substrate 210 includes a light emitting unit 211 and a substrate 212. The light emitting part 211 of the light emitting substrate 210 is a part that emits light, and is configured by, for example, an LED (Light Emitting Diode). The light emitting unit 211 includes, for example, a phosphor that converts blue light into yellow light on an LED chip that emits blue light of about 440 nm to 480 nm, and emits white light as synthesized light. The light emitting unit 211 is mounted on the substrate 212. The substrate 212 is, for example, a plate-like aluminum substrate. A circuit pattern for supplying power is formed on the substrate 212, and elements such as a diode (not shown) are mounted as necessary in addition to the light emitting unit 211. The substrate 212 is connected to a power source (not shown) via a wire 213 and a connector 214.

(Case 215)
The housing 215 houses the light emitting substrate 210, the wire 213, and the connector 214. The housing 215 positions the light emitting unit 211 and the lens 220.

(Lens 220)
The lens 220 is a member that covers the light emitting unit 211 and converts the direction of light emitted from the light emitting unit 211. The lens 220 is made of a transparent material such as acrylic resin, polycarbonate resin, or glass. In addition, the lens 220 may be subjected to a diffusion process on at least a part of the surface of the lens 220. The lens 220 is not a rotating body like the lens 220 in the light source device 1 according to Embodiment 1, but has a long shape extending in the y-axis direction as shown in FIG. Further, the lens 220 is different from the lens 20 in the shapes of the light incident recess 221, the first emission surface portion 224, and the second emission surface portion 229. In addition, you may perform a light-diffusion process by forming uneven | corrugated shape, such as embossing, on all or at least one part of the surface of the lens 220, for example. By subjecting the lens 220 to a light diffusion treatment, the irradiation image can be relaxed and the uneven color of the irradiation surface can be improved.

  FIG. 7 is a schematic longitudinal sectional view of a light source device 200 according to Embodiment 3 of the present invention. An optical axis L1 of the light emitting unit 11 illustrated in FIG. 7 is an axis of light emitted in a direction perpendicular to the light emitting substrate 210. As shown in FIG. 7, the lens 220 has a left-right symmetric shape with the optical axis L <b> 1 as the axis of symmetry in a longitudinal section in the lateral direction (x-axis direction). That is, the lens 220 is long and has a cross-sectional shape that is symmetric with respect to the optical axis L1 of the light emitting substrate 210 in a cross section in a short direction perpendicular to the longitudinal direction. The lens 220 is opposed to the light emitting substrate 210 and has a light incident recess 221 in which light emitted from the light emitting portion 211 of the light emitting substrate 210 enters the lens 220. In addition, the lens 220 transmits the light emitted from the light emitting unit 211 and incident from the light incident recess 221 in the light emitting direction (z-axis positive direction) of the light emitting unit 211 of the light emitting substrate 210, so that the lens 220 An emission surface portion 222 that emits light to the outside is provided. The exit surface portion 222 is located below the light incident recess 221 in the vertical direction. The lens 220 includes a total reflection unit 202 that totally reflects light emitted from the light emitting unit 211 and incident from the light incident recess 221 toward the installation side of the light emitting substrate 10 (z-axis negative direction). Further, the lens 220 includes a small-angle reflecting surface portion 231 that totally reflects light emitted from the light emitting portion 211 and incident from the light incident recess 221 in the light emitting direction (z-axis positive direction) of the light emitting portion 211. In addition, the lens 220 includes a positioning unit 232 provided for positioning with the light emitting unit 211.

(Light incident concave portion 221)
The light incident recess 221 is a portion that is recessed toward the inside of the lens 220 at the center of the ceiling wall 200 a on the upper side of the lens 220. The light incident recess 221 is disposed at a position facing the light emitting surface of the light emitting unit 211 and refracts the light emitted from the light emitting unit 211. The light incident recess 221 has an inclined surface portion 2210 that inclines in a tapered shape so that the width of the light incident recess 221 decreases as it goes downward in the vertical direction with respect to the light emitting substrate 210, and a bottom surface portion 2211 that is the end of the inclined surface portion 2210. It is composed of

(Outgoing surface portion 222)
The exit surface portion 222 is a portion that is provided at a position below the light incident recess 221 in the vertical direction and is formed in a plane that is substantially perpendicular to the optical axis L1 of the light emitting portion 211.

(Total reflection part 202)
The total reflection portion 202 is provided on the outer edge portion 222 a of the emission surface portion 222. Further, the total reflection portion 202 is provided between the ceiling wall 200 a and the emission surface portion 222. The total reflection portion 202 has a plurality of protrusions 3 arranged in parallel in the vertical direction between the light emitting substrate 210 and the emission surface portion 222. The plurality of protrusions 3 protrude to the side of the lens 220 (x-axis direction). In addition, since the lens 220 is elongate, the protrusion part 3 is formed in the column shape long in the longitudinal direction (y-axis direction). In addition, the plurality of protrusions 3 have a curved shape that is convex in the emission direction of light emitted from the light emitting substrate 210. The some protrusion part 3 has the 1st protrusion part 3a and the 2nd protrusion part 3b. In other words, the total reflection portion 202 includes the side wall portion 227 and the first protrusion portion 3a and the second protrusion portion 3b that protrude from the side wall portion 227 to the side. The 1st protrusion part 3a and the 2nd protrusion part 3b are arranged in the up-down direction, and the 2nd protrusion part 3b is formed above the 1st protrusion part 3a.

  The side wall portion 227 is a side wall of the lens 220 that connects a first connection surface portion 225 described later and a second reflection surface portion 228 described later, and forms a surface substantially parallel to the optical axis L1.

  The first protrusion 3 a includes a first reflection surface portion 223 that totally reflects light emitted from the light emitting portion 211 and incident from the light incident recess 21 toward the installation side of the light emitting substrate 210 (z-axis negative direction). The first reflecting surface portion 223 forms a part of the bottom wall of the lens 220 continuously with the emitting surface portion 222. The first protrusion 3 a has a first emission surface portion 224 that transmits the light totally reflected by the first reflection surface portion 223 and emits the light to the outside of the lens 220. The first emission surface portion 224 forms a part of the side wall of the lens 220 at the outer edge lower end portion 223 a of the first reflection surface portion 223. Further, the first protrusion 3 a has a first connection surface portion 225 that faces the second reflection surface portion 228. The first connection surface portion 225 is formed between the upper end portion 224 a of the first emission surface portion 224 and the side wall portion 227.

  The first reflecting surface portion 223 has a shape in which a free curve convex in the light emitting direction (z-axis positive direction) from the light emitting unit 211 is continued in the longitudinal direction (y-axis direction). The first reflecting surface portion 223 has a tangential slope at the first reflecting surface portion 223 so that the light reaching the first reflecting surface portion 223 is totally reflected and changes its direction to the installation side of the light emitting substrate 210 (z-axis negative direction). Is defined to form a curved surface.

  The first emission surface portion 224 is a side wall that transmits the light that is refracted by the light incident recess 221 and then totally reflected by the first reflection surface portion 223 and emits the light. The first emission surface portion 224 forms a surface perpendicular to the short side direction (x-axis direction) with the longitudinal axis (y-axis) as the center, and the light emission direction (z The wall surface moves away from the optical axis L1 (z-axis) as it goes in the positive axial direction. That is, the distance between the lower end portion of the first emission surface portion 224 and the optical axis L1 passing through the center Q of the light emission substrate 210 in the vertical direction of the light emission substrate 210 is the vertical distance between the upper end portion of the first emission surface portion 224 and the light emission substrate 210. It is larger than the distance from the optical axis L1 passing through the center Q of the light emitting substrate 210 in the direction. That is, in the lens 220, the first emission surface portions 224 are arranged so as to face each other at both ends in the short side direction, and the distance between the lower end portions of the first emission surface portion 224 is larger than the distance between the upper end portions.

  The second protrusion 3b has a second reflection surface portion 228 that totally reflects the light emitted from the light emitting portion 211 and incident from the light incident recess 21 toward the installation side of the light emitting substrate 210 (z-axis negative direction). The second reflection surface portion 228 is formed between the side wall portion 227 and a second emission surface portion 229 described later, and faces the first connection surface portion 225. In addition, the second protrusion 3 b has a second emission surface portion 229 that transmits the light totally reflected by the second reflection surface portion 228 and emits the light to the outside of the lens 220. The second emission surface portion 229 forms a part of the side wall of the lens 220 at the outer edge lower end portion 228 a of the second reflection surface portion 228. Furthermore, the 2nd protrusion part 3b has the upper surface part 230 formed between the upper end part 229a of the 2nd output surface part 229, and the ceiling wall 200a.

  The second reflecting surface portion 228 has a shape in which a free curve convex in the light emitting direction (z-axis positive direction) from the light emitting unit 211 is continued in the longitudinal direction (y-axis direction). The second reflection surface portion 228 has a curved surface with a tangential slope in the second reflection surface portion 228 determined so that the light reaching the second reflection surface portion 228 is totally reflected and changes the direction to the installation side of the light emitting substrate 210. Is formed. The thickness of the side concave portion 226 formed by the first connection surface portion 225, the second reflection surface portion 228, and the side wall portion 227 increases as the distance from the optical axis L1 increases. That is, the distance between the first connection surface portion 225 and the second reflection surface portion 228 increases as the distance from the optical axis L1 increases. That is, the total reflection portion 202 is formed such that the distance between the plurality of protrusions 3 increases with increasing distance from the optical axis L1 with respect to the vertical optical axis L1 of the light emitting substrate 210.

  The second emission surface portion 229 is a side wall that transmits the light that is refracted by the light incident recess 221 and then totally reflected by the second reflection surface portion 228 and emits the light. The second emission surface portion 229 forms a surface perpendicular to the short direction (x-axis direction) with the longitudinal axis (y-axis) as the center, and the light emission direction (z The wall surface moves away from the optical axis L1 (z-axis) as it goes in the positive axial direction. That is, the distance between the lower end portion of the second emission surface portion 229 and the optical axis L1 passing through the center Q of the light emission substrate 210 in the vertical direction of the light emission substrate 210 is the vertical distance between the upper end portion of the second emission surface portion 229 and the light emission substrate 210. It is larger than the distance from the optical axis L1 passing through the center Q of the light emitting substrate 210 in the direction. That is, in the lens 220, the second emission surface portions 229 are arranged so as to face each other in the short direction, and the distance between the lower end portions of the second emission surface portion 229 is larger than the distance between the upper end portions. The upper surface portion 230 constitutes a surface connecting the second emission surface portion 229 and the small angle reflection surface portion 231.

  The small angle reflecting surface portion 231 is provided on the outer edge portion 200a1 of the ceiling wall 200a. The small-angle reflecting surface portion 231 has a shape in which a free curve convex on the installation side (z-axis negative direction) of the light emitting substrate 210 is continued in the longitudinal direction (y-axis direction). The small angle reflection surface portion 231 faces the first reflection surface portion 223 in the direction parallel to the optical axis L1. Further, the small angle reflection surface portion 231 faces the light incident recess 221 in a direction perpendicular to the optical axis L1. The small angle reflecting surface portion 231 totally reflects the light emitted from the light emitting portion 211 and reaches the small angle reflecting surface portion 231, and changes the direction to the light emitting direction (z-axis positive direction) emitted by the light emitting portion 211. As described above, the slope of the tangent line in the small angle reflecting surface portion 231 is determined to form a curved surface.

  The positioning portion 232 is formed in a concave shape and is in a fitting relationship with the convex portion 215a provided in the housing 215. The positioning unit 232 positions the lens 220 with respect to the light emitting unit 211.

  FIG. 8 is a schematic longitudinal sectional view showing a light path in the light source device 200 of FIG. Next, in the light source device 200 according to Embodiment 3, the path of light emitted from the center Q of the light emitting substrate 210 will be described. Note that a path of light emitted with different angles from the reference line will be described using a line perpendicular to the optical axis L1 (x-axis direction) as a reference line, that is, a line with an angle of 0 degrees. For example, the direction of the optical axis L1 (z-axis direction) is an angle of 90 degrees from the reference line.

  First, the path of the small-angle light a3 having the smallest angle from the reference line will be described. As shown in FIG. 8, the light distribution of the small angle light a <b> 3 emitted from the center Q of the light emitting substrate 210 is controlled by the small angle reflection surface portion 231. More specifically, the small-angle light a <b> 3 emitted from the center Q of the light emitting substrate 210 enters the lens 220 from the inclined surface portion 2210 that is the side surface of the light incident recess 221. At this time, since the inclined surface portion 2210 is inclined in a tapered shape so that the width of the light incident recess 221 is narrowed downward in the vertical direction with respect to the light emitting substrate 210, the small-angle light a3 is refracted by being refracted. To do. Thereafter, the small-angle light a3 refracted by the light incident concave portion 221 reaches the small-angle reflective surface portion 231 and is totally reflected by the small-angle reflective surface portion 231 and then passes through the side concave portion 226. When the small-angle light a <b> 3 passes through the side recess 226, a part of the light is Fresnel-reflected, but most of the light reaches the first reflection surface portion 223 while being refracted. The small-angle light a3 that has reached the first reflecting surface portion 223 is transmitted through the first reflecting surface portion 223 while being refracted, and is emitted in the emission direction (z-axis positive direction) of the light emitted by the light emitting portion 211.

  Next, a description will be given of the path of the medium-angle light b3 having an intermediate angle from the reference line. As shown in FIG. 8, the light distribution of the medium angle light b <b> 3 is controlled by the second reflecting surface portion 228. More specifically, the medium angle light b <b> 3 emitted from the center Q of the light emitting substrate 210 enters the lens 220 from the light incident recess 221. At this time, the inclined surface portion 2210 is inclined in a tapered shape so that the width of the light incident recess 221 becomes narrower as it goes downward in the vertical direction with respect to the light emitting substrate 210, so that the medium angle light b3 is refracted by being refracted. To do. Thereafter, the medium-angle light b <b> 3 refracted by the light incident recess 221 reaches the second reflecting surface portion 228. The medium-angle light b <b> 3 that has reached the second reflecting surface portion 228 reaches the second emitting surface portion 229 after being totally reflected by the second reflecting surface portion 228. The medium-angle light b3 that has reached the second emission surface portion 229 is transmitted through the second emission surface portion 229 while being refracted, and is emitted to the outside from the side of the lens 220.

  Next, a description will be given of the path of the medium-angle light c3 whose angle from the reference line is medium and the latter half. As shown in FIG. 8, the light distribution of the medium angle light c <b> 3 is controlled by the first reflecting surface portion 223. More specifically, the medium angle light c <b> 3 emitted from the center Q of the light emitting substrate 210 enters the lens 220 from the light incident recess 221. At this time, the inclined surface portion 2210 is inclined in a tapered shape so that the width of the light incident recess 221 becomes narrower as it goes downward in the vertical direction with respect to the light emitting substrate 210, so that the medium angle light c3 is refracted by being refracted. To do. Thereafter, the medium-angle light c <b> 3 refracted by the light incident recess 221 reaches the first reflecting surface portion 223. The medium-angle light c <b> 3 that has reached the first reflection surface portion 223 reaches the first emission surface portion 224 after being totally reflected by the first reflection surface portion 223. The medium-angle light c <b> 3 that has reached the first emission surface portion 224 is transmitted through the first emission surface portion 224 while being refracted, and is emitted to the outside from the side of the lens 220.

  A path of the large-angle light d3 having the largest angle from the reference line will be described. As shown in FIG. 8, the large-angle light d <b> 3 is subjected to light distribution control at the emission surface portion 222. More specifically, the large-angle light d <b> 3 emitted from the center Q of the light emitting substrate 210 enters the lens 20 from the light incident recess 221. At this time, since the inclined surface portion 2210 is inclined in a tapered shape so that the width of the light incident recess 221 is narrowed downward in the vertical direction with respect to the light emitting substrate 210, the large angle light d3 is refracted to emit light. The light is refracted in the light emission direction (z-axis positive direction) by the unit 211. Thereafter, the large-angle light d <b> 3 refracted by the light incident recess 221 reaches the emission surface portion 222. The large-angle light d3 that has reached the emission surface portion 222 passes through the emission surface portion 222 while being refracted, and is emitted in the emission direction (z-axis positive direction) of the light emitted by the light emitting portion 211.

  Finally, the operation of the light source device 200 according to Embodiment 3 will be described. In the light source device 200, the inclined surface portion 2210 that is the side surface of the light incident recess 221 is inclined in a tapered shape so that the width of the side surface of the light incident recess 221 becomes narrower as it goes downward in the vertical direction with respect to the light emitting substrate 210. Therefore, the light source device 200 can easily adjust the amount of light traveling toward the total reflection unit 202 by changing the inclination of the inclined surface portion 2210. That is, the light source device 200 can adjust the ratio of light emitted toward the installation side of the light emitting substrate 210 (z-axis negative direction).

  Further, in the light source device 200 according to Embodiment 3, the first emission surface portion 224 and the second emission surface portion 229 have a plane perpendicular to the short direction (x-axis direction) and an axis in the longitudinal direction (y-axis direction). A tilted surface is formed as the center. And as for the 1st output surface part 224 and the 2nd output surface part 229, a wall surface moves away from the optical axis L1 (z-axis) as it goes to the emission direction (z-axis positive direction) of the light by the light emission part 211. That is, the distance between the lower end portion of the first emission surface portion 224 and the optical axis L1 passing through the center Q of the light emission substrate 210 in the vertical direction of the light emission substrate 210 is the vertical distance between the upper end portion of the first emission surface portion 224 and the light emission substrate 210. It is larger than the distance from the optical axis L1 passing through the center Q of the light emitting substrate 210 in the direction. Further, the distance between the lower end portion of the second emission surface portion 229 and the optical axis L1 passing through the center Q of the light emission substrate 210 in the vertical direction of the light emission substrate 210 is the vertical distance between the upper end portion of the second emission surface portion 229 and the light emission substrate 210. It is larger than the distance from the optical axis L1 passing through the center Q of the light emitting substrate 210 in the direction. The light totally reflected by the first reflecting surface portion 223 and the second reflecting surface portion 228 is refracted and emitted by the first emitting surface portion 224 and the second emitting surface portion 229 toward the light emitting substrate 210 installation side (z-axis negative direction). . However, the light emission direction can be easily adjusted by changing the inclination angles around the longitudinal axes of the first emission surface portion 224 and the second emission surface portion 229.

Embodiment 4 FIG.
FIG. 9 is a perspective view showing an illumination device 300 according to Embodiment 4 of the present invention. Next, the illumination device 300 according to Embodiment 4 will be described with reference to FIG. In addition, about the illuminating device 300 which concerns on Embodiment 4, the part which is common in the light source device 1 which concerns on Embodiment 1 attaches | subjects the same code | symbol, and abbreviate | omits description. Illumination device 300 according to Embodiment 4 uses light source device 1 according to Embodiment 1 for downlighting.

[Lighting device 300]
The illumination device 300 includes the light source device 1, a power source 50 that supplies predetermined power to the light source device 1, and a heat sink 51 that radiates heat generated by the light source device 1. The lighting device 300 includes a cable 52 that connects the light source device 1 and the power supply 50. The lighting device 300 is attached to a ceiling, for example.

  Since the illumination device 300 includes the light source device 1 according to Embodiment 1, the light emission direction (z-axis positive direction) of the light emitting unit 11, that is, the floor side, and the installation side of the light emitting unit 11, that is, the ceiling side And light can be emitted to both. Moreover, since the illuminating device 300 includes the light source device 1 according to Embodiment 1, it is possible to suppress both light from being emitted to an area where glare is felt and to achieve both indirect illumination and direct illumination. .

  The illumination device 300 according to the fourth embodiment uses the light source device 1 according to the first embodiment, but the light source device 100 according to the second embodiment and the light source device 200 according to the third embodiment are used. May be. In addition, the lighting device 300 may be attached to other than the ceiling, for example, attached to a wall using a fixing bracket. Furthermore, the lighting device 300 may be installed on a table, or may be used in other places or applications.

  In addition, embodiment of this invention is not limited to the said Embodiment 1-4, A various change can be added. For example, in Embodiments 1 to 4, LEDs are used as the light emitting unit 11 and the light emitting unit 211. However, the present invention is not limited to this, and an LD (Laser Diode) or the like may be used, and the area of one light emitting surface is large. It may be a light emitting element. The arrangement of the light source, the outer shape of the lens 20 and the lens 220, and the shape of the light source device 1 may be elliptical or polygonal, and are not limited. Moreover, although the aluminum substrate is used for the board | substrate 12, the board | substrate 212, etc., other metal substrates, such as iron, may be used, and a cheaper glass epoxy resin or paper phenol material may be used. Further, a heat conductive material such as a heat conductive grease or a heat conductive sheet or an adhesive may be interposed between the light source device 1 and the heat sink 51. Whether or not to use these adhesives is appropriately determined based on the heat-resistant temperature, lifetime, strength, and the like of the LEDs and circuit elements used.

  DESCRIPTION OF SYMBOLS 1 Light source device, 2 Total reflection part, 3 protrusion part, 3a 1st protrusion part, 3b 2nd protrusion part, 3c 3rd protrusion part, 10 light emission board | substrate, 11 light emission part, 12 board | substrate, 13 wire, 14 connector, 15 housings Body, 15a convex shape part, 20 lens, 20a ceiling wall, 20a1 outer edge part, 21 light incident concave part, 22 emission surface part, 22a outer edge part, 23 first reflection surface part, 23a outer edge lower end part, 24 first emission surface part, 24a upper end Part, 25 1st connection surface part, 26 Side surface recessed part, 27 Side wall part, 27a 1st side wall part, 27b 2nd side wall part, 28 2nd reflective surface part, 28a Outer edge lower end part, 29 2nd output surface part, 29a Upper end part, 30 Upper surface portion, 31 Small angle reflection surface portion, 32 Positioning portion, 40 Second connection surface portion, 41 Second side surface recess portion, 43 Third reflection surface portion, 43a Outer edge lower end portion, 44 Third emission surface portion, 44 Upper end portion, 50 power source, 51 heat sink, 52 cable, 100 light source device, 102 total reflection portion, 120 lens, 130 upper surface portion, 200 light source device, 200a ceiling wall, 200a1 outer edge portion, 202 total reflection portion, 210 light emitting substrate, 211 Light emitting part, 212 substrate, 213 wire, 214 connector, 215 housing, 215a convex shape part, 220 lens, 221 light incident concave part, 222 outgoing surface part, 222a outer edge part, 223 first reflecting surface part, 223a outer edge lower end part, 224 first One exit surface portion, 224a upper end portion, 225 first connection surface portion, 226 side surface recess, 227 side wall portion, 228 second reflection surface portion, 228a outer edge lower end portion, 229 second exit surface portion, 229a upper end portion, 230 upper surface portion, 231 small angle Reflective surface portion, 232 positioning portion, 300 lighting device, 2 10 inclined surface, 2211 the bottom portion.

Claims (12)

A light emitting substrate that emits light;
A lens provided in an emission direction of light emitted from the light emitting substrate;
With
The lens is
A light incident recess facing the light emitting substrate and receiving light from the light emitting substrate;
An emission surface portion that is located below the light incident recess and emits light incident from the light entrance recess in the direction of emission of light emitted from the light emitting substrate;
A total reflection portion that is provided at an outer edge portion of the emission surface portion and totally reflects the light incident from the light incident recess to the installation side of the light emitting substrate;
The total reflection part is a light source device having a plurality of protrusions arranged in the vertical direction between the light emitting substrate and the emission surface part.   The light source device according to claim 1, wherein the plurality of projecting portions have a curved shape that is convex in an emission direction of light emitted from the light emitting substrate. The total reflection part is
3. The light source device according to claim 1, wherein the plurality of protrusions are formed such that a distance from each other increases with increasing distance from the optical axis with respect to an optical axis in a vertical direction of the light emitting substrate. In the total reflection part,
The side wall located between the plurality of protrusions is
The position of the said light emitting board | substrate is located in the installation side of the said light emitting board | substrate from the line segment which connected the center of the said light emitting board | substrate, and the outer edge lower end part of the said protrusion part located in the said output surface part side rather than the said side wall part. The light source device according to any one of the above. The plurality of protrusions are
A first protrusion, and a second protrusion formed above the first protrusion,
The first protrusion is
A first reflecting surface portion that totally reflects the light incident from the light incident recess to the installation side of the light emitting substrate;
A first emission surface portion that is located at an outer edge portion of the first reflection surface portion, transmits the light totally reflected by the first reflection surface portion, and emits the light to the outside of the lens;
Have
The second protrusion is
A second reflecting surface portion that totally reflects the light incident from the light incident recess to the installation side of the light emitting substrate;
5. A second emission surface portion that is located at an outer edge portion of the second reflection surface portion and transmits the light totally reflected by the second reflection surface portion and emits the light to the outside of the lens. The light source device according to item. The plurality of protrusions are
A third protrusion formed above the second protrusion;
The third protrusion is
A third reflecting surface portion that totally reflects the light incident from the light incident recess to the installation side of the light emitting substrate;
The light source device according to claim 5, further comprising: a third emission surface portion that is located at an outer edge portion of the third reflection surface portion and transmits the light totally reflected by the third reflection surface portion and emits the light to the outside of the lens. The first protrusion is
The distance between the lower end portion of the first emission surface portion and the optical axis passing through the center of the light emission substrate in the vertical direction of the light emission substrate is the distance between the upper end portion of the first emission surface portion and the vertical direction of the light emission substrate. Greater than the distance to the optical axis through the center of the substrate,
The second protrusion is
The distance between the lower end portion of the second emission surface portion and the optical axis passing through the center of the light emission substrate in the vertical direction of the light emission substrate is the distance between the upper end portion of the second emission surface portion and the vertical direction of the light emission substrate. The light source device according to claim 5, wherein the light source device is larger than a distance from an optical axis passing through a center of the substrate.   The light source device according to claim 1, wherein the lens is a rotating body centering on an optical axis passing through a center of the light emitting substrate in a direction perpendicular to the light emitting substrate.   8. The lens according to claim 1, wherein the lens is long and has a cross-sectional shape that is symmetrical with respect to an optical axis in a vertical direction of the light emitting substrate in a cross section in a short direction perpendicular to the longitudinal direction. The light source device according to 1. The light incident recess is
The light source device according to claim 9, further comprising: an inclined surface portion that is inclined in a tapered shape so that a width of a side surface of the light incident recess is narrowed toward a lower side in a vertical direction with respect to the light emitting substrate.   The light source device according to claim 1, wherein at least a part of a surface of the lens is subjected to diffusion treatment. The light source device according to any one of claims 1 to 11,
A power source for supplying power to the light source device;
A heat sink for dissipating heat generated by the light source device;
A lighting device comprising:

Images