JP2018170096A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of suppressing the spread of light to a lower region of a wall surface from becoming too small while improving the light distribution to the upper region of the wall surface. A lighting fixture 1 includes a light source 5, a reflecting unit 7, and an internal reflecting unit 21. The reflecting portion 7 has an inner surface 28 that reflects light. The internal reflection unit 21 is installed inside the reflection unit 7 and reflects light. The internal reflection portion 21 curves convexly toward the internal space of the reflection portion 7. The reflection unit 7 includes a first emission opening 27 that emits light. The first exit opening 27 has an opening 27a and an opening edge 27b. The internal reflection portion 21 is adjacent to the opening edge 27b of the first exit opening 27. [Selection diagram] Fig. 2

Description

  The present invention relates to a lighting fixture.

  The lighting fixture described in Patent Document 1 is a wall washer downlight, and is installed on a ceiling. The luminaire includes a planar light source and a reflector having a halved cylindrical shape. The planar light source is fixed to the lighting fixture so that the optical axis passing through the center of the planar light source matches the central axis of the lighting fixture.

  The reflector has a reflecting surface for the wall surface. The reflecting surface for the wall surface reflects light from the light source toward the wall surface. The wall-facing reflecting surfaces are divided into three parts according to function, and in order from the bottom, the first reflecting surface (hereinafter referred to as “lower end reflecting surface”), the second reflecting surface, and the third reflecting surface. Have In particular, the lower end reflecting surface reflects light in a direction parallel to the ceiling surface. Therefore, the light distribution to the upper part (including the corners) of the wall surface can be improved.

Japanese Patent Laid-Open No. 2006-51528

  However, in the luminaire described in Patent Document 1, the lower end reflecting surface is reduced in diameter as the distance from the light source is increased. In addition, the lower end reflection surface is curved so that the lower end edge of the lower end reflection surface approaches the optical axis. In addition, the lower-end reflective surface is a curved surface that is curved in a concave shape so as to be away from the optical axis in a sectional view.

  Therefore, for example, when the lighting fixture is installed in the vicinity of the wall surface, the light reflected by the lower-end reflecting surface tends to concentrate on a region of the wall surface close to the ceiling. That is, the brightest part where the light is concentrated occurs in an area of the wall surface close to the ceiling.

  Therefore, the illuminance of light in the lower region of the upper region and the lower region of the wall surface is particularly insufficient. That is, the spread of light to the lower region of the wall surface becomes too small, and the light distribution to the lower region of the wall surface cannot be improved.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting apparatus capable of suppressing the spread of light to the lower region of the wall surface from becoming too small while improving the light distribution to the upper region of the wall surface. Is to provide.

  The lighting fixture disclosed in the present application includes a light source, a reflection portion, and an internal reflection portion. The reflecting portion has an inner surface that reflects light. The internal reflection part is installed inside the reflection part and reflects light. The internal reflection portion is curved in a convex shape toward the internal space of the reflection portion.

  In the lighting fixture disclosed in the present application, it is preferable that the reflection portion includes a first emission opening that emits light. It is preferable that the first emission opening has an opening and an opening edge. The internal reflection part is preferably adjacent to the opening edge of the first emission opening.

  In the lighting fixture disclosed in the present application, it is preferable that the inner surface of the reflecting portion includes a first region and a second region facing the internal reflecting portion. The light reflectance of the second region is preferably larger than the light reflectance of the first region.

  In the lighting fixture disclosed in the present application, it is preferable that the reflection portion includes a first reflection portion that reflects light. The first reflection part preferably includes a first emission opening that emits light. The first exit opening preferably has an opening. The position of the center of the opening of the first emission opening is preferably different from the position of the optical axis of the light source in the opening.

  In the lighting fixture disclosed in the present application, it is preferable that the reflection portion includes a second reflection portion that reflects light. It is preferable that the second reflecting portion includes a second incident opening that allows light to enter and a second emitting opening that emits light. The second exit opening is preferably inclined with respect to the second entrance opening.

  It is preferable that the lighting fixture disclosed in the present application further includes an optical element. The optical element is preferably installed corresponding to the second exit opening and refracts light.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the spreading of the light to the lower area | region of a wall surface becomes too small, improving the light distribution to the upper area | region of a wall surface.

It is a side view which shows the lighting fixture which concerns on embodiment of this invention. It is side surface sectional drawing which shows the lighting fixture which concerns on embodiment. It is a perspective view which shows a lighting fixture when looking up at the lighting fixture which concerns on embodiment. It is a disassembled perspective view which shows the lighting fixture which concerns on embodiment. It is side surface sectional drawing which shows the room where the lighting fixture which concerns on embodiment is installed. (A) is a perspective view which shows the internal reflection part which concerns on embodiment. (B) is a top view which shows the internal reflection part which concerns on embodiment. (C) is a front view which shows the internal reflection part which concerns on embodiment. (A) is a side view which shows the 1st reflection part which concerns on embodiment. (B) is a bottom view which shows the lighting fixture which concerns on embodiment. It is a bottom view which shows the lighting fixture which concerns on embodiment. (A) is a side view which shows the 1st reflection part which concerns on embodiment. (B) is a side view which shows the 1st reflection part which concerns on the modification of embodiment. (A) is a perspective view which shows the optical element which concerns on embodiment. (B) is an expanded sectional view which followed the XB-XB line | wire of Fig.10 (a) which shows the optical element which concerns on embodiment. (A) is a perspective view which shows the optical element which concerns on the 1st modification of embodiment. FIG. 11B is an enlarged cross-sectional view taken along line XIB-XIB in FIG. 11A illustrating the optical element according to the first modification. (A) is a perspective view which shows the optical element which concerns on the 2nd modification of embodiment. FIG. 12B is an enlarged cross-sectional view taken along line XIIB-XIIB in FIG. 12A showing an optical element according to a second modification. (A) is a perspective view which shows the optical element which concerns on the 3rd modification of embodiment. (B) is an expanded sectional view which followed the XIIIB-XIIIB line | wire of Fig.13 (a) which shows the optical element which concerns on a 3rd modification. (A) is a perspective view which shows the optical element which concerns on the 4th modification of embodiment. FIG. 14B is an enlarged sectional view taken along line XIVB-XIVB in FIG. 14A showing an optical element according to a fourth modification. (A) is a perspective view which shows the optical element which concerns on the 5th modification of embodiment. (B) is an expanded sectional view which shows the optical element which concerns on a 5th modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof is not repeated. In the embodiment, the X axis and the Y axis of the three-dimensional orthogonal coordinate system are parallel to the horizontal line, and the Z axis is parallel to the vertical line. The positive direction of the Z axis is the opposite direction to the gravity direction and indicates the upward direction, and the negative direction of the Z axis is the gravity direction and indicates the downward direction.

  With reference to FIGS. 1-10 (b), the lighting fixture 1 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a side view showing the luminaire 1. As shown in FIG. 1, the luminaire 1 emits light. In this embodiment, the lighting fixture 1 is a wall washer downlight. The lighting fixture 1 is attached to the ceiling C, for example. Specifically, the luminaire 1 includes a heat sink 3, a light source 5, a reflector 4, a frame body 9, and a plurality of attachment members 11 (four attachment members 11 in the present embodiment).

  The light source 5 emits light. The light source 5 is attached to a substantially central portion of the base end surface of the heat sink 3. The heat sink 3 includes a plurality of fins 13. The heat sink 3 dissipates heat generated by the light source 5 by a plurality of fins. Therefore, the heat sink 3 suppresses an abnormal temperature rise of the light source 5. Note that heat dissipation is heat dissipation.

  The reflector 4 reflects light. Specifically, the reflector 4 includes a holding unit 6 and a reflecting unit 7. The holding part 6 holds the base end part of the heat sink 3. The reflection unit 7 reflects the light emitted from the light source 5 and emits the light toward the outside of the lighting fixture 1. The frame body 9 has a substantially cylindrical shape and supports the reflector 4. Each of the attachment members 11 is attached to the frame body 9. Each of the attachment members 11 is a leaf spring, for example.

  The frame body 9 is inserted into an attachment hole OP formed in the ceiling C. And each of the attachment member 11 contact | abuts to the wall surface around the attachment hole OP. Therefore, the frame body 9 is attached to the ceiling C by the elasticity of the plurality of attachment members 11. As a result, the lighting fixture 1 is attached to the ceiling C.

  In FIG. 1, the attachment member 11 before contacting the wall surface around the attachment hole OP is shown in order to facilitate understanding of the shape of the attachment member 11.

  Next, the internal structure of the lighting fixture 1 will be described with reference to FIGS. FIG. 2 is a side sectional view showing the lighting apparatus 1. FIG. 3 is a perspective view showing the luminaire 1 when looking up at the luminaire 1. FIG. 4 is an exploded perspective view showing the luminaire 1.

  2 to 4, the light source 5 has an optical axis LA, and includes a substrate 5a and a light emitting unit 5b. The optical axis LA is orthogonal to the light emitting part 5b and passes through the center of the light emitting part 5b. In the present embodiment, the optical axis LA is along the vertical direction. The substrate 5 a is attached to the substantially central portion of the base end surface of the heat sink 3. The light emitting unit 5b is mounted on the mounting surface of the substrate 5a.

  The light emitting unit 5b emits light. The light emitting unit 5b includes a plurality of light emitting elements. In the present embodiment, the light emitting element is an LED (Light Emitting Diode). The light emitting unit 5b is a COB (Chip on Board) type. The COB type is a type in which the light emitting unit 5b is formed by sealing a plurality of LEDs with a phosphor. The light emitting unit 5b may be an SMD (Surface Mount Device) type. In the SMD type, an LED chip is formed by uniting an LED and a phosphor, and a plurality of LED chips are placed on the mounting surface of the substrate 5a and electrically connected to the conductive pattern of the substrate 5a. It is the type which forms 5b.

  The reflecting portion 7 is hollow and has an inner surface 28. The inner surface 28 reflects the light emitted from the light source 5 and emits the light toward the outside of the lighting fixture 1.

  The reflector 7 has a first exit opening 27 and a second entrance opening 31. The first incident opening 41 will be described later. The second incident opening 31 faces the light source 5 and receives light emitted from the light source 5. Specifically, the second incident opening 31 has an opening 31a and an opening edge 31b. The opening edge 31b has a substantially circular shape. The second incident opening 31 is substantially orthogonal to the optical axis LA.

  The first emission opening 27 emits the light emitted from the light source 5 and incident from the second incident opening 31 to the outside of the lighting fixture 1. Specifically, the 1st output opening part 27 has the opening 27a and the opening edge 27b. The opening edge 27b has a substantially circular shape. The first exit opening 27 and the second entrance opening 31 are substantially parallel to each other. The first exit opening 27 is substantially orthogonal to the optical axis LA.

  The reflection unit 7 preferably includes a first reflection unit 15 and a second reflection unit 17. The second reflecting unit 17 is located between the light source 5 and the first reflecting unit 15. The first reflecting unit 15 reflects light. Specifically, the 1st reflection part 15 is hollow and has the inner surface 29 which reflects light. The inner surface 29 constitutes the inner surface 28 of the reflecting portion 7. Moreover, the 1st reflection part 15 has a substantially oblique cone shape. The obliquely cut cone shape is a shape obtained by cutting the cone shape with an inclined surface inclined with respect to the cone axis. Further, the first reflecting portion 15 includes a first emission opening portion 27 and a first incident opening portion 41. The first exit opening 27 of the first reflector 15 functions as the first exit opening 27 of the reflector 7.

  The first incident opening 41 receives light. The first incident opening 41 has an opening 41a and an opening edge 41b. The opening edge 41b has a substantially circular shape. The first entrance opening 41 is inclined with respect to the first exit opening 27. The first incident opening 41 is inclined with respect to the optical axis LA.

  Specifically, as shown in FIG. 2, the first incident opening 41 is inclined upward toward the front direction FD of the lighting fixture 1. That is, the first incident opening 41 is inclined in the pitch direction with respect to the first outgoing opening 27. However, the first entrance opening 41 is not inclined in the roll direction with respect to the first exit opening 27.

  The front direction FD of the lighting fixture 1 indicates a direction from the lighting fixture 1 side toward the wall Wa. The forward direction FD faces the negative direction of the X axis. The pitch direction with respect to the first incident opening 41 indicates a rotation direction around the left-right axis of the first incident opening 41. In FIG. 2, the left-right axis of the first incident opening 41 is parallel to the Y-axis. Further, the roll direction with respect to the first incident opening 41 indicates the rotation direction around the front-rear axis of the first incident opening 41. In FIG. 2, the front-rear axis of the first incident opening 41 is inclined with respect to the X axis and is parallel to the first incident opening 41. The yaw direction with respect to the first incident opening 41 indicates the rotational direction around the vertical axis of the first incident opening 41. In FIG. 2, the vertical axis of the first incident opening 41 is inclined with respect to the Z axis and is orthogonal to the first incident opening 41. Further, front and rear and left and right are defined with respect to the forward direction FD.

  The luminaire 1 is attached to the ceiling C so that the longest inclined surface 29 a of the inner surface 29 of the first reflecting portion 15 is closer to the wall Wa than the shortest inclined surface 29 b of the inner surface 29. In addition, in this embodiment, wall Wa is an example of the irradiation target object of the lighting fixture 1. FIG. The wall surface Ws of the wall Wa is an example of an illumination area of the lighting fixture 1.

  As shown in FIGS. 2-4, the 2nd reflection part 17 reflects light. Specifically, the 2nd reflection part 17 is hollow and has the inner surface 33 which reflects light. The inner surface 33 constitutes the inner surface 28 of the reflecting portion 7.

  The inner surface 28 of the second reflecting portion 17 preferably reflects the light specularly in order to reflect light efficiently. Accordingly, the inner surface 28 is subjected to a reflection process such as silver paint or a reflection process such as glossy metal plating. Moreover, the material of the 2nd reflection part 17 may have a color with high light reflectivity like silver. The inner surface 28 may be white. Therefore, the inner surface 28 may be subjected to a reflection process such as white coating. Moreover, the color of the material of the second reflection unit 17 may be white.

  The second reflecting portion 17 includes a second incident opening 31 and a second outgoing opening 43. The second incident opening 31 of the second reflecting portion 17 functions as the second incident opening 31 of the reflecting portion 7. The second emission opening 43 emits light. Specifically, the second emission opening 43 has an opening 43a and an opening edge 43b. The opening edge 43b has a substantially circular shape. The second exit opening 43 is inclined with respect to the second entrance opening 31. The second exit opening 43 is inclined with respect to the optical axis LA.

  Specifically, as illustrated in FIG. 2, the second emission opening 43 is inclined upward toward the front direction FD of the lighting fixture 1. That is, the second exit opening 43 is inclined in the pitch direction with respect to the second entrance opening 31. However, the second exit opening 43 is not inclined in the roll direction with respect to the second entrance opening 31.

  The pitch direction with respect to the second exit opening 43 indicates the rotation direction around the left and right axis of the second exit opening 43. In FIG. 2, the left and right axis of the second emission opening 43 is parallel to the Y axis. Further, the roll direction with respect to the second emission opening 43 indicates the rotation direction around the front-rear axis of the second emission opening 43. In FIG. 2, the front / rear axis of the second exit opening 43 is inclined with respect to the X axis and is parallel to the second exit opening 43. The yaw direction with respect to the second emission opening 43 indicates the rotation direction around the vertical axis of the second emission opening 43. In FIG. 2, the vertical axis of the second exit opening 43 is inclined with respect to the Z axis and is orthogonal to the second exit opening 43. Further, front and rear and left and right are defined with respect to the forward direction FD.

  The second reflecting part 17 includes a symmetric reflecting part 17 a, an asymmetric reflecting part 17 b, and a holding part 6. The holding part 6 of the second reflecting part 17 functions as the holding part 6 of the reflector 4. The symmetrical reflecting portion 17 a has a second incident opening 31. The symmetric reflector 17a is symmetric with respect to the optical axis LA and has a hollow, substantially truncated cone shape. The symmetric reflector 17a reflects light.

  The asymmetric reflection portion 17 b has a second emission opening 43. The asymmetric reflector 17b is asymmetric with respect to the optical axis LA and has a hollow, substantially obliquely cut cylindrical shape. The obliquely cut cylindrical shape is a shape obtained by cutting the cylindrical shape with an inclined surface inclined with respect to the cylindrical axis. The asymmetric reflector 17b reflects light.

  The asymmetric reflector 17 b is formed in the second reflector 17 because the second exit opening 43 is inclined with respect to the second entrance opening 31. And the lighting fixture 1 is attached to the ceiling C so that the longest vertical surface 34a of the inner surfaces 34 of the asymmetrical reflection part 17b is farther from the wall Wa than the optical axis LA. And the asymmetrical reflection part 17b is extended toward the 1st output opening part 27 rather than the symmetrical reflection part 17a. Therefore, a region having a relatively large area in the inner surface 34 of the asymmetrical reflecting portion 17b faces the wall Wa side. As a result, according to this embodiment, light can be effectively emitted toward the wall Wa.

  As shown in FIGS. 2-4, the 1st reflection part 15 and the 2nd reflection part 17 are couple | bonded. Specifically, the first reflecting portion 15 and the second reflecting portion 17 are coupled so that the first incident opening 41 and the second emitting opening 43 face each other.

  The lighting fixture 1 further includes an internal reflection portion 21. The internal reflection unit 21 reflects light.

  Specifically, the light emitted from the light source 5 enters from the second incident opening 31. As a result, part of the light incident from the second incident opening 31 is reflected by the inner surface 33 of the second reflecting part 17 and is emitted from the second emitting opening 43. Further, a part of the light incident from the second incident opening 31 is emitted from the second emission opening 43 without being reflected by the inner surface 33 of the second reflecting part 17.

  The light emitted from the second exit opening 43 enters from the first entrance opening 41. As a result, part of the light incident from the first incident opening 41 is reflected by the inner surface 29 of the first reflecting portion 15 and is emitted from the first emission opening 27. Further, part of the light incident from the first incident opening 41 is reflected by the internal reflecting portion 21 and is emitted from the first emitting opening 27.

  The internal reflection part 21 is installed inside the reflection part 7 so as to be biased toward the side away from the wall Wa with respect to the optical axis LA. The internal reflection portion 21 is curved in a convex shape toward the internal space of the reflection portion 7. Specifically, the internal reflection portion 21 is installed inside the first reflection portion 15 so as to be biased toward the side away from the wall Wa with respect to the optical axis LA. The internal reflection part 21 is curved in a convex shape toward the internal space of the first reflection part 15. In addition, the internal reflection portion 21 is installed inside the first reflection portion 15 on the shortest inclined surface 29b side among the longest inclined surface 29a side and the shortest inclined surface 29b side.

  The internal reflection portion 21 is adjacent to the opening edge 27 b of the first emission opening portion 27. Therefore, according to the present embodiment, light can be reflected more effectively toward the wall Wa as compared with the case where the internal reflection portion 21 is installed away from the first emission opening 27. In addition, the internal reflection portion 21 protrudes from the opening 27 a of the first emission opening portion 27.

  Furthermore, the lighting fixture 1 may further include a decorative board 23. The decorative plate 23 is attached to the bottom of the internal reflection portion 21. In addition, the decorative board 23 and the internal reflection part 21 may be formed by integral molding.

  Furthermore, it is preferable that the luminaire 1 further includes an optical element 25. The optical element 25 is made of synthetic resin or glass, for example. The optical element 25 has a substantially disk shape, and refracts and emits light incident on the optical element 25. Specifically, the optical element 25 refracts the light incident on the optical element 25 toward the wall Wa and emits it. Therefore, according to this embodiment, light can be more effectively emitted toward the wall Wa.

  The optical element 25 is installed corresponding to the first incident opening 41 and the second emitting opening 43. Specifically, the optical element 25 is installed between the first reflecting portion 15 and the second reflecting portion 17 so as to face the first incident opening 41 and the second emitting opening 43. For example, the optical element 25 is sandwiched between the first reflecting portion 15 and the second reflecting portion 17. Therefore, the light emitted from the second exit opening 43 is refracted by the optical element 25 and enters from the first entrance opening 41.

  In FIG. 2, the frame body 9 and the attachment member 11 are omitted and the oblique lines indicating the cross section of the heat sink 3 are omitted for simplification of the drawing. In FIG. 3, the heat sink 3, the frame body 9, and the attachment member 11 are omitted for simplification of the drawing. Further, in FIG. 4, the frame body 9 and the attachment member 11 are omitted for simplification of the drawing.

  Next, referring to FIG. 5, the light distribution of the luminaire 1 is compared with the wall washer type luminaire described in Patent Document 1 (hereinafter referred to as “general luminaire”). explain. FIG. 5 is a side sectional view showing the room R in which the lighting fixture 1 is installed. As shown in FIG. 5, the wall Wa in the room R is a lighting object of the lighting fixture 1 and a general lighting fixture. The wall surface Ws of the wall Wa is an illumination area of the lighting fixture 1 and a general lighting fixture.

  In a general lighting fixture, since the lower end reflection surface of the reflector is curved in a concave shape, the spread of light in the vertically downward direction is relatively small. Therefore, when the lighting fixture is installed in the vicinity of the wall surface Ws, the light reflected by the reflecting surface at the lower end of the reflector is likely to be concentrated on a region near the ceiling C in the wall surface Ws. As a result, light is concentrated and the brightest portion G2 is generated in a region near the ceiling C in the wall surface Ws.

  On the other hand, in the lighting fixture 1, since the internal reflection portion 21 is curved in a convex shape, the spread of light in the vertically downward direction is larger than that of a general lighting fixture. Therefore, even when the lighting fixture 1 is installed in the vicinity of the wall surface Ws, it is possible to suppress the light reflected by the internal reflection portion 21 from being concentrated on a region near the ceiling C in the wall surface Ws. As a result, light is concentrated and the brightest portion G1 is generated below the wall Ws in the vicinity of the ceiling C. That is, the brightest part G1 by the lighting fixture 1 is generated below the brightest portion G2 by a general lighting fixture.

  Therefore, it is possible to suppress a shortage of light illuminance in the lower region Wd among the upper region Wu and the lower region Wd of the wall surface Ws. That is, it is possible to suppress the spread of light to the lower region Wd of the wall surface Ws from becoming too small. As a result, according to the present embodiment, light distribution to the lower region Wd of the wall surface Ws can be improved compared to a general lighting fixture.

  In addition, in the lighting fixture 1, since the internal reflection portion 21 is curved in a convex shape, the light reflected by the internal reflection portion 21 is concentrated at a position that is too far from the corner K between the wall surface Ws and the ceiling C. This can be suppressed. That is, it is possible to suppress the brightest portion G1 from being concentrated at a position that is too far from the corner K. Therefore, according to this embodiment, the light distribution to the upper corner Wu of the entering corner K and the wall surface Ws can be improved. The upper region Wu of the wall surface Ws includes a part of the entering corner K.

  As described above with reference to FIG. 5, according to the present embodiment, the light distribution to the lower region Wd of the wall surface Ws becomes too small while the light distribution to the upper region Wu of the wall surface Ws is improved. This can be suppressed.

  Next, the internal reflection unit 21 will be described with reference to FIGS. FIG. 6A is a perspective view showing the internal reflection portion 21. FIG. 6B is a plan view showing the internal reflection portion 21. FIG. 6C is a front view showing the internal reflection portion 21. As shown in FIGS. 6A to 6C, the internal reflection portion 21 has a plurality of reflection surfaces RS. The plurality of reflecting surfaces RS are arranged around the optical axis LA. Accordingly, not only can the light spread in the vertically downward direction be increased by the reflecting surface RS, but also the light spread in the horizontal direction can be increased by the reflecting surface RS. As a result, on the wall surface Ws (FIG. 5), not only can the illumination range be expanded along the vertical direction, but also the illumination range can be expanded along the horizontal direction.

  In the present embodiment, the internal reflection portion 21 has three reflection surfaces RS. When distinguishing and describing the three reflecting surfaces RS, the three reflecting surfaces RS are referred to as a first reflecting surface 21a, a second reflecting surface 21b, and a third reflecting surface 21c, respectively. Note that the number of the reflective surfaces RS may be one or plural other than three. Further, the plurality of reflecting surfaces RS may be separated from each other.

  Each of the reflection surfaces RS preferably reflects light in a specular manner in order to reflect light efficiently. Therefore, each reflective surface RS is subjected to a reflective process such as silver paint or a reflective process such as glossy metal plating. Moreover, the material of the internal reflection part 21 may have a color with high light reflectance like silver. Each of the reflection surfaces RS may be white. Therefore, each reflective surface RS may be subjected to a reflective process such as white paint. Moreover, the color of the material of the internal reflection part 21 may be white.

  Each of the reflection surfaces RS is formed by a part of a spherical surface and faces obliquely upward. Therefore, each of the reflective surfaces RS is curved in a convex shape toward the internal space of the reflective portion 7 (specifically, the first reflective portion 15). Of the three reflecting surfaces RS, the first reflecting surface 21a and the third reflecting surface 21c face each other. The second reflecting surface 21b is located between the first reflecting surface 21a and the third reflecting surface 21c. The first reflecting surface 21a to the third reflecting surface 21c form a substantially V shape in plan view.

  The reflective surface RS is not limited to a part of the spherical surface, and may be a curved surface other than a part of the spherical surface. For example, the reflecting surface RS may be a part of an aspheric surface. For example, the reflective surface RS may form a part of a parabola, a part of an ellipse, or a part of a hyperbola in a cross-sectional view.

  Next, with reference to FIG. 5, FIG. 7 (a), and FIG. 7 (b), the relationship between the 1st reflection part 15 and the optical axis LA is demonstrated. FIG. 7A is a side view showing the first reflecting portion 15. FIG. 7B is a bottom view showing the luminaire 1. As shown in FIGS. 7A and 7B, the opening 27a of the first emission opening 27 has a radius d2. The position of the center CT of the opening 27a of the first emission opening 27 is different from the position of the optical axis LA in the opening 27a. Specifically, the center CT of the opening 27a and the optical axis LA at the opening 27a are separated by a distance d1.

  Therefore, compared with the case where the optical axis LA passes through the center CT of the opening 27a, the first exit opening portion of the light incident from the first entrance opening portion 41 is not incident on the inner surface 29 of the first reflecting portion 15. The light emitted from 27 can be increased. As a result, according to the present embodiment, light can be emitted more effectively toward the wall Wa (FIG. 5).

  For example, when the optical axis LA passes through the center CT of the opening 27a, the light BM2 enters the first reflecting unit 15 when the incident angle of the light BM2 becomes equal to or larger than the angle value θ. Therefore, the light BM2 is not directly emitted toward the wall Wa. On the other hand, when the position of the center CT of the opening 27a is different from the position of the optical axis LA at the opening 27a, the light BM1 is incident on the first reflecting portion 15 even if the incident angle of the light BM1 is equal to or larger than the angle value θ. The light is emitted directly toward the wall Wa without being performed. As a result, light can be emitted more effectively toward the wall Wa. The angle value θ represents an angle value in the light traveling direction with respect to the optical axis LA.

  Next, the inner surface 29 of the first reflecting portion 15 will be described with reference to FIGS. FIG. 8 is a bottom view showing the luminaire 1. In FIG. 8, the decorative plate 23 is omitted and the internal reflection portion 21 is indicated by a two-dot chain line for simplification of the drawing.

  As shown in FIG. 8, the inner surface 29 of the reflection part 7 has the 1st area | region 30a and the 2nd area | region 30b. In FIG. 8, dot hatching is added to the first region 30 a for easy understanding. Specifically, the inner surface 29 of the first reflecting portion 15 has a first region 30a and a second region 30b.

  The first region 30 a faces the opening 27 a of the first emission opening 27 and does not face the internal reflection portion 21. On the other hand, the second region 30 b faces the internal reflection part 21. And the light reflectance of the 2nd field 30b is larger than the light reflectance of the 1st field 30a. Therefore, while suppressing glare (that is, glare) by the first region 30a having a relatively low light reflectance, light can be spread and emitted by the second region 30b having a relatively large light reflectance. As a result, according to the present embodiment, light can be emitted more effectively toward the wall Wa (FIG. 5) while suppressing glare. The light reflectance indicates the ratio of the emitted light amount with respect to the incident light amount.

  For example, the first region 30a slightly reflects light. On the other hand, the second region 30b reflects, for example, light that is incident from the first incident opening 41 and is directly incident on the second region 30b. The second region 30b spreads and emits light from the first emission opening 27.

  The first region 30a preferably has a color or material that easily absorbs light. On the other hand, the second region 30b preferably has a color or material that easily reflects light. In particular, the second region 30b preferably mirrors light in order to reflect light efficiently.

  For example, the first reflective portion 15 is formed of a black material, and the first region 30a is black, while the second region 30b has a reflective process such as silver paint or a glossy metal plating. Reflective processing is applied to achieve specular reflection. Further, for example, the first reflecting portion 15 is made of a material having a high light reflectance such as silver, and the first region 30a is black-coated while realizing the specular reflection in the second region 30b. . The second region 30b may be white. Accordingly, the second region 30b may be subjected to a reflective process such as white coating. Further, the color of the material of the second region 30b may be white.

  Next, with reference to FIG. 5, FIG. 9 (a), and FIG.9 (b), the 1st reflection part 15 and the 1st reflection part 15A as a modification of the 1st reflection part 15 are demonstrated. FIG. 9A is a side view showing the first reflecting portion 15. As shown in FIG. 9A, in the first reflecting portion 15, in a side view, the angle θa formed by the longest inclined surface 29a of the first reflecting portion 15 with respect to the optical axis LA and the shortest with respect to the optical axis LA. The angle θa formed by the inclined surface 29b is substantially the same. For example, the 1st reflection part 15 is formed by cut | disconnecting the hollow frustum 45 by plane PL1. The plane PL1 is inclined with respect to the lower bottom of the truncated cone 45.

  FIG. 9B is a side view showing the first reflecting portion 15A according to the modification. As shown in FIG. 9B, in the first reflecting portion 15A, the angle θb formed by the longest inclined surface 29a of the first reflecting portion 15A with respect to the optical axis LA in the side view is the second with respect to the optical axis LA. It is larger than the angle θc formed by the shortest inclined surface 29b of one reflecting portion 15A. For example, the first reflecting portion 15A is formed by cutting the hollow truncated cone 45 along the plane PL2 and the plane PL3. The plane PL2 and the plane PL3 are inclined with respect to the lower base of the truncated cone 45 and are not parallel to each other.

  As shown in FIGS. 9A and 9B, the height Ha of the first reflecting portion 15 and the height Ha of the first reflecting portion 15A are the same. However, in the first reflecting portion 15A, since the angle θb is larger than the angle θc, the longest inclined surface 29a of the first reflecting portion 15A is longer than the longest inclined surface 29a of the first reflecting portion 15. Therefore, in the modified example, since the light incident on the longest inclined surface 29a is reduced, the light emitted from the first emission opening 27 of the first reflection unit 15A and directed to the wall Wa (FIG. 5) is the first reflection unit. More than the light emitted from the 15 first emission openings 27 and directed to the wall Wa. As a result, according to the modification, light can be emitted more effectively toward the wall Wa.

  Next, the optical element 25 will be described with reference to FIGS. 2, 5, 10 (a), and 10 (b). FIG. 10A is a perspective view showing the optical element 25. FIG. 10B is an enlarged sectional view taken along line XB-XB in FIG. In FIG. 10B, for the sake of simplification of the drawing, oblique lines indicating a cross section of the optical element 25 are omitted. FIG. 10B shows only light LT0 incident along the normal VL of the optical element 25 out of light incident on the optical element 25 for convenience of explanation. The normal line VL is orthogonal to the optical element 25.

  As shown in FIG. 10A, the optical element 25 transmits light. The optical element 25 includes a refraction part 51. The refraction part 51 faces the light source 5 (FIG. 2). The refracting unit 51 refracts the light incident on the refracting unit 51 toward the wall Wa (FIG. 5) and emits the light.

  As shown in FIG. 10B, the thickness direction TA of the optical element 25 is along the normal line VL of the optical element 25. That is, the thickness direction TA is substantially parallel to the normal line of the optical element 25. The optical element 25 further includes a transmission part 53. The refraction part 51 and the transmission part 53 are integrally formed to form the optical element 25. In addition, integrally forming the refracting portion 51 and the transmitting portion 53 of this embodiment is an example.

  The refraction part 51 refracts light. That is, the refracting unit 51 bends the light so that the light is biased in the predetermined direction D. In this specification, the refracting unit 51 bends light so that the light is biased in a predetermined direction D with respect to the normal line VL. That is, the refracting unit 51 bends the light so that the light is biased in the predetermined direction D with respect to the thickness direction TA of the optical element 25. In this specification, bending light indicates changing the traveling direction of light. The predetermined direction D intersects the normal line VL. In this specification, the predetermined direction D is orthogonal to the normal line VL.

  The refraction part 51 includes a plurality of refraction elements 51a. Each of the plurality of refractive elements 51a refracts light. The refractive element 51a has an inclined surface 51b. The refracting element 51a has a substantially triangular shape (specifically, a substantially right triangle shape) in a cross-sectional view. The refraction element 51a has a substantially triangular prism shape and extends along one direction (in this embodiment, the Y-axis direction). The plurality of refractive elements 51a are substantially parallel.

  The refractive element 51a is inclined by an angle θ0 with respect to the thickness direction TA of the optical element 25. Specifically, the inclined surface 51b of the refractive element 51a is inclined by an angle θ0 with respect to the thickness direction TA of the optical element 25. The angle θ0 indicates the angle of the inclined surface 51b with respect to the thickness direction TA of the optical element 25. The angle θ0 is an acute angle. The inclined surface 51b is formed so that the light LT0 incident on the refraction element 51a is refracted toward the illumination object. The magnitude of the angle θ0 can be determined, for example, by changing the width W of the refractive element 51a and / or the height H of the refractive element 51a. In the present specification, the width of the refractive element 51a indicates the length of the refractive element 51a along the direction orthogonal to the thickness direction TA. The height of the refractive element 51a indicates the length of the refractive element 51a along the thickness direction TA.

  The transmission part 53 transmits light. The transmission part 53 and the refraction part 51 are adjacent to each other. The surface 52a of the transmission part 53 is a flat surface, for example. For example, the surface 52 a of the transmission part 53 may be subjected to a textured process.

  The light LT0 emitted from the light source 5 enters the inclined surface 51b of the refractive element 51a. The refraction element 51a refracts the light LT0 incident on the refraction element 51a so that the light LT0 incident on the inclined surface 51b is directed toward the wall Wa. The light LT0 refracted by the refraction element 51a enters the transmission part 53. The transmission part 53 transmits the light LT0 incident on the transmission part 53 and emits it.

  As described above, as described with reference to FIGS. 2, 5, 10 (a), and 10 (b), the refracting portion 51 is inclined by the angle θ 0 with respect to the thickness direction TA of the optical element 25. A refractive element 51a is included. The refraction element 51a is formed such that the light LT0 incident on the refraction element 51a is refracted toward the wall Wa side. Accordingly, light can be emitted more effectively toward the wall Wa.

  Next, with reference to FIG. 2, FIG. 5, and FIG. 11 (a)-FIG.15 (b), the lighting fixture 1 which concerns on the 1st modification-5th modification of this invention is demonstrated. In FIG. 11B, FIG. 12B, FIG. 13B, FIG. 14B, and FIG. 15B, for the sake of simplification of the drawings, the hatching indicating the cross section is omitted and the description is omitted. For the sake of convenience, only light incident along the normal VL of the optical element is illustrated in the light incident on the optical element. The normal line VL is orthogonal to the optical element. Further, as illustrated in FIG. 5, the case where the lighting fixture 1 is attached to the ceiling C and the illumination target of the lighting fixture 1 is the wall Wa of the room R to which the lighting fixture 1 is attached will be described as an example. .

(First modification)
With reference to FIG.2, FIG.5, FIG.11 (a) and FIG.11 (b), the lighting fixture 1 which concerns on the 1st modification of this invention is demonstrated. The lighting fixture 1 according to the first modification is different from the lighting fixture 1 shown in FIG. 2 in that an optical element 60 is provided instead of the optical element 25. Hereinafter, the lighting fixture 1 which concerns on a 1st modification mainly demonstrates a different point from the lighting fixture 1 shown in FIG.

  Fig.11 (a) is a perspective view which shows the optical element 60 of the lighting fixture 1 which concerns on a 1st modification. FIG. 11B is an enlarged cross-sectional view of the optical element 60 taken along line XIB-XIB in FIG.

  As shown in FIGS. 11A and 11B, the optical element 60 includes a refraction part 61, a diffusion part 62, and a transmission part 63. The configuration of the refraction unit 61 and the configuration of the transmission unit 63 are the same as the configuration of the refraction unit 51 and the configuration of the transmission unit 53 described with reference to FIGS. 10A and 10B, respectively. Therefore, description of the configuration of the refraction unit 61 and the configuration of the transmission unit 63 is omitted.

  The diffusion unit 62 faces the refraction unit 61. The refraction part 61 is closer to the light source 5 (FIG. 2) than the diffusion part 62. The diffusion unit 62 diffuses light. In this specification, the diffusion of light is a concept including spreading light or scattering light. Light scattering indicates that light is scattered by, for example, irregular reflection. Specifically, the light refracted by the refraction part 61 is incident on the diffusion part 62. The diffusing unit 62 diffuses the light incident on the diffusing unit 62 so that the light incident on the diffusing unit 62 is diffused and emitted. Therefore, the light emitted from the light source 5 is refracted by the refracting portion 61 so as to be directed toward the wall Wa and diffused to the diffusing portion 62, and then directly emitted from the luminaire 1, for example. As a result, it is possible to suppress the occurrence of illuminance unevenness on the wall surface Ws as compared with the case where refracted light is directly emitted from the lighting fixture 1.

  Specifically, in the example of FIG. 11B, the diffusing unit 62 scatters light. In the first modification, the diffusing portion 62 is formed by providing minute irregularities on the light exit surface of the diffusing portion 62. That is, the diffusion part 62 has an uneven shape. Specifically, the diffusion unit 62 includes a plurality of diffusion elements 62a. In the first modification, each of the plurality of diffusing elements 62a is curved in a convex shape so as to be away from the refracting portion 61, and diffuses light. In the example of FIG. 11B, the diffusing element 62a scatters light. The diffusing element 62a has a substantially missing circle shape in a cross-sectional view. In the first modification, the diffusing element 62a has a substantially spherical shape. However, as long as the diffusion element 62a diffuses the light incident on the diffusion element 62a, the shape of the diffusion element 62a may be any shape. In the first modification, the plurality of diffusion elements 62a are arranged in a lattice pattern. However, the plurality of diffusion elements 62a may be arranged in a staggered manner or arbitrarily. In the first modification, the diffusing unit 62 functions as a diffusion lens.

  The light LT1 emitted from the light source 5 enters the inclined surface 61b of the refractive element 61a. The refraction element 61a refracts the light LT1 incident on the refraction element 61a so that the light LT1 incident on the inclined surface 61b is directed toward the wall Wa. The light LT1 refracted by the refraction element 61a is incident on the transmission part 63. The transmission part 63 transmits the light LT1 incident on the transmission part 63. The light LT1 transmitted by the transmission part 63 is incident on the diffusion element 62a. The diffusion element 62a diffuses the light LT1 incident on the diffusion element 62a. The diffusion element 62a emits the light LT1 diffused by the diffusion element 62a as the light LD1.

  As described above with reference to FIGS. 11A and 11B, according to the first modification, the diffusing portion 62 is a diffusing element 62 a that curves in a convex shape so as to be away from the refracting portion 61. including. Accordingly, the diffusion unit 62 can diffuse the light LT1 incident on the diffusion unit 62. As a result, the illuminance of the wall surface Ws of the wall Wa becomes substantially uniform, and the occurrence of illuminance unevenness on the wall surface Ws can be suppressed. For example, when the lighting device 1 irradiates a portion (entrance corner) where the wall Wa and the ceiling C intersect, the illuminance of the upper region Wu of the wall Wa and the illuminance of the lower region Wd of the wall Wa become substantially uniform, It is possible to suppress the occurrence of illuminance unevenness in Ws.

(Second modification)
A second modification of the present invention will be described with reference to FIGS. 2, 5, 12 (a), and 12 (b). The second modification is different from the luminaire 1 shown in FIG. 2 in that an optical element 70 is provided instead of the optical element 25. Hereinafter, the lighting fixture 1 which concerns on a 2nd modification mainly demonstrates a different point from the lighting fixture 1 shown in FIG.

  FIG. 12A is a plan view showing the refracting portion 71 of the optical element 70 according to the second modification. FIG. 12B is a schematic cross-sectional view of the optical element 70 taken along line XIIB-XIIB in FIG.

  As shown in FIGS. 12A and 12B, the optical element 70 includes a refraction part 71, a diffusion part 72, and a transmission part 73. The diffusing unit 72 faces the refracting unit 71. The refracting unit 71 is closer to the light source 5 (FIG. 2) than the diffusing unit 72. The transmission part 73 is located between the diffusion part 72 and the refraction part 71. The configuration of the transmission unit 73 is the same as the configuration of the transmission unit 53 described with reference to FIGS. 10 (a) and 10 (b). Further, the configuration of the diffusing unit 72 is the same as the configuration of the diffusing unit 62 described with reference to FIGS. 11A and 11B. Therefore, description of the configuration of the transmission unit 73 and the configuration of the diffusion unit 72 is omitted.

  The refracting unit 71 refracts light. The refraction part 71 has a plurality of refraction areas A7. In the second modification, the refracting portion 71 has two refracting regions A7. Hereinafter, in the second modification, one of the two refraction areas A7 is referred to as a first refraction area A71, and the other of the two refraction areas A7 is referred to as a second refraction area A72. The first refraction area A71 and the second refraction area A72 are adjacent to each other. The luminaire 1 is arranged so that the first refracting region A71 is closer to the illumination object of the luminaire 1 than the second refracting region A72. That is, in the second modification, the first refraction area A71 is closer to the wall Wa than the second refraction area A72.

  The refraction part 71 includes a plurality of refraction elements 71a. The refraction element 71a refracts light. The refracting element 71a has a substantially triangular shape (specifically, a substantially right triangle shape) in a cross-sectional view. The refracting element 71a has a substantially triangular prism shape, and extends along one direction (in the second modification, the Y-axis direction). The plurality of refractive elements 71a are substantially parallel. Hereinafter, in the second modification, the refraction element 71a positioned in the first refraction area A71 is referred to as a first refraction element 71a1, and the refraction element 71a located in the second refraction area A72 is referred to as a second refraction element 71a2.

  The shape of the first refractive element 71a1 is different from the shape of the second refractive element 71a2. Specifically, the inclined surface 71b1 of the first refractive element 71a1 is inclined by an angle θ2 with respect to the thickness direction TA of the optical element 70. On the other hand, the inclined surface 71b2 of the second refractive element 71a2 is inclined by an angle θ3 with respect to the thickness direction TA of the optical element 70. The angle θ2 is different from the angle θ3. In the second modification, the angle θ2 is smaller than the angle θ3. That is, the inclination of the inclined surface 71b1 with respect to the thickness direction TA is smaller than the inclination of the inclined surface 71b2 with respect to the thickness direction TA. When the angle θ2 and the angle θ3 are different, that is, when the inclination angle θ2 of the inclined surface 71b1 is different from the inclination angle θ3 of the inclined surface 71b2, the shape of the first refractive element 71a1 and the shape of the second refractive element 71a2 are different. Indicates different.

  The first refractive element 71a1 refracts the light LT2 incident on the first refractive element 71a1 by an angle θ4 with respect to the thickness direction TA of the optical element 70. On the other hand, the second refraction element 71a2 refracts the light LT3 incident on the second refraction element 71a2 by an angle θ5 with respect to the thickness direction TA of the optical element 70. The angle θ4 is larger than the angle θ5. Accordingly, the first refraction element 71a1 refracts the light LT2 incident on the first refraction element 71a1 toward the upper region Wu of the wall Wa that is the illumination object. On the other hand, the second refraction element 71a2 refracts the light LT3 incident on the second refraction element 71a2 toward the lower region Wd of the wall Wa.

  Each of the light LT2 refracted by the first refraction element 71a1 and the light LT3 refracted by the second refraction element 71a2 enters the transmission part 73. The transmission unit 73 transmits the light LT2 and the light LT3 incident on the transmission unit 73. The light LT2 and the light LT3 transmitted by the transmission part 73 are incident on the diffusion element 72a. The diffusion element 72a diffuses the light LT2 and the light LT3 incident on the diffusion element 72a. The diffusing element 72a emits the light LT2 diffused by the diffusing element 72a as the light LD2, and emits the light LT3 diffused by the diffusing element 72a as the light LD3. The light LD2 and the light LD3 emitted by the diffusing element 72a are directly emitted from the lighting fixture 1, for example. And light LD2 is irradiated to the upper area | region Wu of wall Wa as an illumination target object. On the other hand, the light LD3 is applied to the lower region Wd of the wall Wa as the illumination object.

  As described above with reference to FIGS. 12A and 12B, according to the second modification, the first refractive element located in the first refractive area A71 of the plurality of refractive areas A7. The shape of 71a1 is different from the shape of the second refraction element 71a2 located in the second refraction region A72 of the plurality of refraction regions A7. Therefore, the illumination area of the light emitted from the optical element 70 is expanded as compared with the case where the shapes of the plurality of refractive elements 71a are all the same. As a result, the illumination area of the luminaire 1 is expanded.

  Moreover, according to the 2nd modification, the light which the lighting fixture 1 emits is diffusing. Therefore, the illumination intensity of the illumination area of the lighting fixture 1 can be uniformly irradiated. As a result, it is possible to suppress the occurrence of illuminance unevenness in the illumination area of the luminaire 1.

  Further, according to the second modification, the plurality of refractive elements 71a include different refractive elements (first refractive element 71a1 and second refractive element 71a2), thereby increasing the degree of freedom in light distribution design. Therefore, it becomes easy to control the light distribution so that the illumination area is expanded.

(Third Modification)
A third modification of the present embodiment will be described with reference to FIGS. 2, 5, 13 (a), and 13 (b). The lighting fixture 1 according to the third modification is different from the lighting fixture 1 shown in FIG. 2 in that an optical element 80 is provided instead of the optical element 25. Hereinafter, the lighting fixture 1 which concerns on a 3rd modification mainly demonstrates a different point from the lighting fixture 1 shown in FIG.

  FIG. 13A is a plan view showing a refracting portion 81 of an optical element 80 according to a third modification. FIG. 13B is a schematic cross-sectional view of the optical element 80 taken along line XIIIB-XIIIB in FIG. Note that the wall Wa may be described as a first illumination object and the floor F may be described as a second illumination object.

  The optical element 80 includes a refraction part 81, a diffusion part 82, and a transmission part 83. The diffusing unit 82 faces the refracting unit 81. The refraction part 81 is closer to the light source 5 (FIG. 2) than the diffusion part 82. The transmission part 83 is located between the diffusion part 82 and the refraction part 81. The configuration of the transmission unit 83 is the same as the configuration of the transmission unit 53 described with reference to FIGS. 10 (a) and 10 (b). The configuration of the diffusing unit 82 is the same as the configuration of the diffusing unit 62 described with reference to FIGS. 11 (a) and 11 (b). For this reason, the description about the structure of the permeation | transmission part 83 and the structure of the spreading | diffusion part 82 is abbreviate | omitted.

  The refraction part 81 refracts light. The refraction part 81 has a plurality of refraction areas A8. In the third modification, the refraction part 81 has two refraction areas A8. Hereinafter, in the third modification, one of the two refraction areas A8 is referred to as a third refraction area A83, and the other of the two refraction areas A8 is referred to as a fourth refraction area A84. The third refraction area A83 and the fourth refraction area A84 are adjacent to each other. The luminaire 1 is arranged so that the third refractive region A83 is closer to the first illumination object of the luminaire 1 than the fourth refractive region A84. That is, in the third modification, the third refraction area A83 is closer to the wall Wa than the fourth refraction area A84.

  The refraction part 81 includes a plurality of refraction elements 81a. Each of the plurality of refractive elements 81a refracts light. Each of the plurality of refractive elements 81 a is inclined with respect to the thickness direction TA of the optical element 80. The refracting element 81a has a substantially triangular shape (specifically, a substantially right-angled triangular shape) in cross-sectional view. The refraction element 81a has a substantially triangular prism shape, and extends along one direction (in the third modification, the Y-axis direction). The plurality of refractive elements 81a are substantially parallel. Hereinafter, in the third modification, the refraction element 81a located in the third refraction area A83 is referred to as a third refraction element 81a3, and the refraction element 81a located in the fourth refraction area A84 is referred to as a fourth refraction element 81a4. The third refraction element 81a3 has an inclined surface 81b3, and the fourth refraction element 81a4 has an inclined surface 81b4.

  The shape of the third refraction element 81a3 is different from the shape of the fourth refraction element 81a4. Specifically, the inclined surface 81b3 of the third refractive element 81a3 is inclined by an angle θ6 with respect to the thickness direction TA of the optical element 80. On the other hand, the inclined surface 81b4 of the fourth refractive element 81a4 is inclined by the angle θ7 with respect to the thickness direction TA of the optical element 80. The angle θ6 is smaller than the angle θ7. The angle θ6 is an acute angle, and the angle θ7 is an obtuse angle. That is, the inclination direction of the inclined surface 81b3 is different from the inclination direction of the inclined surface 81b4. When the inclination direction of the inclined surface 81b3 and the inclination direction of the inclined surface 81b4 are different, it indicates that the shape of the third refractive element 81a3 and the shape of the fourth refractive element 81a4 are different.

  The third refraction element 81a3 refracts the light LT4 incident on the third refraction element 81a3 toward the first illumination object by an angle θ8 with respect to the thickness direction TA of the optical element 80. On the other hand, the fourth refraction element 81a4 refracts the light LT5 incident on the fourth refraction element 81a4 to the second illumination object side by an angle θ9 with respect to the thickness direction TA of the optical element 80. Here, the angle θ8 indicates an angle at which the light LT4 is inclined in the clockwise direction with respect to the thickness direction TA. The angle θ9 indicates an angle at which the light LT5 is inclined counterclockwise with respect to the thickness direction TA. Accordingly, the third refraction element 81a3 refracts the light LT4 so that the light LT4 incident on the third refraction element 81a3 is directed toward the wall Wa serving as the first illumination object. On the other hand, the fourth refraction element 81a4 refracts the light LT5 so that the light LT5 incident on the fourth refraction element 81a4 is directed toward the floor F as the second illumination object.

  The light LT4 refracted by the third refraction element 81a3 and the light LT5 refracted by the fourth refraction element 81a4 enter the transmission part 83. The transmission unit 83 transmits the light LT4 and the light LT5 incident on the transmission unit 83. The light LT4 and the light LT5 transmitted by the transmission part 83 are incident on the diffusing element 82a. The diffusion element 82a diffuses the light LT4 and the light LT5 incident on the diffusion element 82a. The diffusing element 82a emits the light LT4 diffused by the diffusing element 82a as the light LD4, and emits the light LT5 diffused by the diffusing element 82a as the light LD5. The light LD4 and light LD5 emitted by the diffusing element 82a are directly emitted from the lighting fixture 1, for example. And light LD2 is irradiated to wall Wa as a 1st illumination object. On the other hand, the light LD3 is applied to the floor F as the second illumination object.

  As described above with reference to FIGS. 13A and 13B, according to the third modification, the third refraction element located in the third refraction area A83 among the plurality of refraction areas A8. The shape of 81a13 is different from the shape of the fourth refraction element 81a4 located in the fourth refraction region A84 of the plurality of refraction regions A8. Accordingly, the illumination area of the light emitted from the optical element 80 is expanded as compared with the case where the shapes of the plurality of refractive elements 81a are all the same. As a result, the illumination area of the luminaire 1 is expanded. For example, the lighting fixture 1 can irradiate the wall Wa and the floor F.

  According to the third modification, the plurality of refractive elements 81a include different refractive elements (the third refractive element 81a13 and the fourth refractive element 81a4), thereby increasing the degree of freedom in light distribution design. Therefore, it becomes easy to control the light distribution so that the illumination area is expanded.

  Moreover, according to the 3rd modification, the light which the lighting fixture 1 emits has spread | diffused. Therefore, the illumination intensity of the illumination area of the lighting fixture 1 can be irradiated substantially uniformly. As a result, it is possible to suppress the occurrence of illuminance unevenness in the illumination area of the luminaire 1.

(Fourth modification)
A fourth modification of the present embodiment will be described with reference to FIGS. 2, 5, 14 (a), and 14 (b). The lighting fixture 1 according to the fourth modification is different from the lighting fixture 1 shown in FIG. 2 in that an optical element 90 is provided instead of the optical element 25. Hereinafter, the lighting fixture 1 which concerns on a 4th modification mainly demonstrates a different point from the lighting fixture 1 shown in FIG.

  FIG. 14A is a plan view showing a diffusing portion 92 of an optical element 90 according to a fourth modification. FIG. 14B is a schematic cross-sectional view of the optical element 90 taken along the line XIVB-XIVB in FIG.

  As shown in FIGS. 14A and 14B, the optical element 90 includes a refracting portion 91, a diffusing portion 92, and a transmitting portion 93. The diffusing unit 92 faces the refracting unit 91. The diffusion unit 92 diffuses light. In the example of FIG. 14B, the diffusion unit 92 scatters light. The refracting portion 91 is closer to the light source 5 (FIG. 2) than the diffusing portion 92. The transmission part 93 is located between the diffusion part 92 and the refraction part 91. The transmission part 93 transmits light. The configuration of the refraction unit 91 and the configuration of the transmission unit 93 are the same as the configuration of the refraction unit 91 and the configuration of the transmission unit 93 described with reference to FIGS. 10A and 10B, respectively. For this reason, the description about the structure of the refractive part 91 and the structure of the permeation | transmission part 93 is abbreviate | omitted.

  The diffusion unit 92 has a plurality of diffusion regions A9. In the fourth modified example, the diffusion unit 92 has two diffusion regions A9. Hereinafter, in the fourth modification, one of the two diffusion regions A9 is referred to as a first diffusion region A91, and the other of the two diffusion regions A9 is referred to as a second diffusion region A92. The first diffusion region A91 and the second diffusion region A92 are adjacent to each other. The lighting fixture 1 is arrange | positioned so that 1st spreading | diffusion area | region A91 may be near the illumination object side of the lighting fixture 1 rather than 2nd spreading | diffusion area | region A92. That is, in the fourth modified example, the first diffusion region A91 is closer to the wall Wa than the second diffusion region A92.

  Further, the diffusion unit 92 includes a plurality of diffusion elements 92a. Each of the plurality of diffusing elements 92a diffuses light. In the example of FIG. 14B, the diffusing element 92a scatters light.

  Each of the plurality of diffusing elements 92 a is curved in a convex shape so as to be away from the refracting portion 91. The diffusing element 92a is substantially in a circular shape in cross-sectional view. The diffusing element 92a is substantially spherical.

  Hereinafter, in the fourth modification, the diffusion element 92a located in the first diffusion region A91 is referred to as a first diffusion element 92a1, and the diffusion element 92a located in the second diffusion region A92 is referred to as a second diffusion element 92a2. The shape of the first diffusion element 92a1 is different from the shape of the second diffusion element 92a2. Specifically, the curvature of the first diffusion element 92a1 is larger than the curvature of the second diffusion element 92a2. Different curvatures indicate different shapes. In addition, the size of the first diffusion element 92a1 is smaller than the size of the second diffusion element 92a2. That is, the number of first diffusion elements 92a1 per unit area of the first diffusion region A91 is larger than the number of second diffusion elements 92a2 per unit area of the second diffusion region A92. The plurality of first diffusion elements 92a1 are arranged in a lattice pattern in the first diffusion region A91, for example, and the plurality of second diffusion elements 92a2 are arranged in a lattice pattern in the second diffusion region A92, for example. The plurality of first diffusion elements 92a1 may be arranged in a staggered manner or arbitrarily.

  The refractive element 91a refracts each of the light LT6 and the light LT7 incident on the refractive element 91a by an angle θ10 with respect to the thickness direction TA of the optical element 90. The light LT6 and the light LT7 refracted by the refraction element 91a enter the transmission part 93. The transmission part 93 transmits the light LT6 and the light LT7 incident on the transmission part 93. The light LT6 transmitted by the transmission part 93 is incident on the first diffusion element 92a1. On the other hand, the light LT7 transmitted by the transmission part 93 is incident on the second diffusion element 92a2.

  The first diffusion element 92a1 diffuses the light LT6 incident on the first diffusion element 92a1. Then, the first diffusion element 92a1 emits the light LT6 diffused by the first diffusion element 92a1 as the light LD6. On the other hand, the second diffusing element 92a2 diffuses the light LT7 incident on the second diffusing element 92a2. Then, the light LT7 diffused by the second diffusion element 92a2 is emitted as the light LD7. The light LD6 emitted from the first diffusing element 92a1 and the light LD7 emitted from the second diffusing element 92a2 are directly emitted from the lighting fixture 1, for example. The light LD6 is diffused in a wider range than the light LD7. Then, the light LD6 and the light LD7 are applied to the wall Wa as the illumination object.

  As described above with reference to FIGS. 14A and 14B, according to the fourth modification, the first diffusion element located in the first diffusion region A91 among the plurality of diffusion regions A9. The shape of 92a1 is different from the shape of the second diffusion element 92a2 located in the second diffusion region A92 of the plurality of diffusion regions A9. Therefore, the width of the illumination area of the light LD6 emitted from the first diffusion element 92a1 is different from the width of the illumination area of the light LD7 emitted from the second diffusion element 92a2. As a result, the illuminance of the illumination area by the light LD6 and the illuminance of the illumination area by the light LD7 are made more uniform than when the light LD6 and the light LD7 are diffused to the same extent. Can be prevented from occurring. Specifically, it is as follows.

  The distance until the light LD6 emitted from the first diffusing element 92a1 reaches the wall Wa as the illumination object of the luminaire 1 is such that the light LD7 emitted from the second diffusing element 92a2 serves as the illumination object of the luminaire 1. It is shorter than the distance to reach the wall Wa. That is, when each of the light LD6 and the light LD7 is diffused to the same extent and illuminates the wall Wa, the illumination area of the light LD6 is higher than the illumination area of the light LD7, and the light is higher than the illumination area of the light LD7. The illumination area of LD6 is brighter. Therefore, by diffusing the light LD6 in a wider range than the light LD7, the illuminance of the illumination area by the light LD6 and the illuminance of the illumination area by the light LD7 become substantially uniform. As a result, it is possible to suppress the occurrence of illuminance unevenness in the illumination area of the lighting fixture 1 as compared to the case where the shapes of the plurality of diffusing elements 92a are all the same.

(5th modification)
With reference to FIG. 2, FIG. 5, FIG. 15 (a), and FIG. 15 (b), a fifth modification of the present embodiment will be described. The lighting fixture 1 which concerns on a 5th modification differs from the lighting fixture 1 shown in FIG. 2 by the point provided with the optical element 100 instead of the optical element 25. FIG. Hereinafter, the lighting fixture 1 which concerns on a 5th modification mainly demonstrates a different point from the lighting fixture 1 shown in FIG.

  FIG. 15A is a side view showing the optical element 100 according to the fifth modification. FIG. 15B is an enlarged cross-sectional view of the optical element 100 according to the fifth modification.

  As shown in FIGS. 15A and 15B, the optical element 100 includes a refraction part 101, a diffusion part 102, and a transmission part 103. The diffusion unit 102 faces the refraction unit 101. The diffusion unit 102 diffuses light. In the fifth modification, the diffusion unit 102 spreads light. The refraction part 101 is closer to the light source 5 (FIG. 2) than the diffusion part 102. The transmission part 103 is located between the diffusion part 102 and the refraction part 101. The transmission unit 103 transmits light. The configuration of the refraction unit 101 and the configuration of the transmission unit 103 are the same as the configuration of the refraction unit 101 and the configuration of the transmission unit 103 described with reference to FIG. 10A and FIG. For this reason, the description about the structure of the refractive part 101 and the structure of the transmission part 103 is abbreviate | omitted.

  The diffusion unit 102 includes a diffusion element 102a. The diffusing element 102a diffuses light. In the fifth modification, the diffusing element 102a spreads light. The diffusing element 102a curves in a concave shape toward the refracting portion 101. Specifically, the thickness of the diffusing element 102a gradually increases from the side of the diffusing element 102a closer to the illumination object toward the side farther from the illumination object. The diffusing element 102a is a concave lens and extends along one direction (in the fifth modification, the Y-axis direction).

  The refraction element 101a refracts the light LT8 incident on the refraction element 101a by an angle θ11 with respect to the thickness direction TA of the optical element 100. The light LT8 refracted by the refraction element 101a is incident on the transmission unit 103. The transmission unit 103 transmits the light LT8 incident on the transmission unit 103. The light LT8 transmitted by the transmission unit 103 enters the diffusing element 102a. The diffusion element 102a diffuses the light LT8 incident on the diffusion element 102a. The diffusing element 102a emits the light LT8 diffused by the diffusing element 102a as the light LD8. The light LD8 emitted by the diffusing element 102a is directly emitted from the lighting fixture 1, for example. And light LD8 is irradiated to the wall Wa as an illumination target object.

  As described above with reference to FIGS. 15A and 15B, according to the fifth modification, the diffusing portion 102 includes the diffusing element 102 a that curves concavely toward the refracting portion 101. . Therefore, the light emitted from the optical element 100 is diffused. Specifically, light spreads. As a result, it is possible to suppress the occurrence of illuminance unevenness in the illumination area of the luminaire 1.

  The embodiments (including modifications) of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be implemented in various modes without departing from the gist thereof (for example, (1) to (11) shown below). In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined. In order to facilitate understanding, the drawings schematically show each component as a main component, and the thickness, length, number, interval, etc. of each component shown in the drawings are actual for convenience of drawing. May be different. In addition, the material, shape, dimensions, and the like of each component shown in the above embodiment are merely examples, and are not particularly limited, and various changes can be made without departing from the effects of the present invention. is there.

  (1) In the present embodiment described with reference to FIG. 2, the light source 5 is installed substantially parallel to the ceiling C. However, the light source 5 may be installed inclined with respect to the ceiling C. In this case, it is preferable to incline the light source 5 with respect to the ceiling C so that the light source 5 faces the wall Wa. As a result, light can be emitted more effectively toward the wall Wa.

  (2) In the present embodiment described with reference to FIG. 2, the first reflecting portion 15 may be provided without providing the second reflecting portion 17. The second reflection unit 17 may be provided without providing the first reflection unit 15, and the internal reflection unit 21 may be installed inside the second reflection unit 17. Any one of the first reflecting portion 15 and the second reflecting portion 17 may be provided without providing the optical element 25. Any one of the symmetric reflection part 17a and the asymmetrical reflection part 17b may be provided.

  (3) As described with reference to FIG. 2, in the present embodiment, the light source 5 is located outside the second reflecting portion 17. However, the light source 5 may be located inside the second reflecting portion 17.

  (4) As described with reference to FIGS. 11A and 11B, in the present embodiment, the diffusing unit 62 has a diffusing element 62a that curves in a convex shape so as to be away from the refracting unit 61. did. However, as long as the diffusing unit 62 diffuses light incident on the diffusing unit 62, the diffusing unit 62 does not include the diffusing element 62a and may be a flat surface. For example, the diffusing portion 62 may be formed by molding a resin mixed with a light diffusing material into a substantially disc shape, or may have a milky white color.

  (5) As described with reference to FIGS. 14A and 14B, in the fourth modification, the diffusing section 92 includes the first diffusing element 92a1 and the second diffusing element 92a2 having different shapes. It is. However, as long as the light emitted from the first diffusion region A91 is diffused over a wider range than the light emitted from the second diffusion region A92, the diffusion portion 92 does not include the plurality of diffusion elements 92a and may be a flat surface. . That is, the property of the first diffusion element 92a1 only needs to be different from the property of the second diffusion element 92a2. The property of the first diffusing element 92a1 indicates an optical property indicating the degree of light diffusion by the first diffusing element 92a1. The property of the second diffusing element 92a2 indicates an optical property indicating the degree of light diffusion by the second diffusing element 92a2.

  For example, the diffusion part 92 is formed of a resin mixed with a light diffusion material that diffuses light. At this time, the density of the light diffusing material contained in the first diffusion region A91 is larger than the density of the light diffusing material contained in the second diffusion region A92. For example, the diffusion unit 92 has a color like milky white. Therefore, the light that has passed through the first diffusion region A91 is diffused over a wider range than the light that has passed through the second diffusion region A92. By appropriately setting the ratio, it is possible to suppress the occurrence of illuminance unevenness in the illumination area of the luminaire 1.

  (6) As described with reference to FIGS. 10A and 10B, in this embodiment, the refracting portion 51 includes a plurality of refracting elements 51a, but the refracting portion 51 is incident on the refracting portion 51. As long as the refracted light is refracted, the refracting portion 51 may include a single refracting element 51a. In the first modification, the diffusion unit 62 includes a plurality of diffusion elements 62a. However, as long as the diffusion unit 62 diffuses light incident on the diffusion unit 62, the diffusion unit 62 includes a single diffusion element 62a. But you can. When the refracting element 61a and / or the diffusing element 62a are singular, the refracting element 61a and / or the diffusing element 62a can be formed with a simple structure. When there are a plurality of refractive elements 61a and / or diffusing elements 62a, the thickness of the optical element 25 can be reduced.

  (7) As described with reference to FIGS. 15A and 15B, in the fifth modification, the diffusing unit 102 of the optical element 100 includes a single diffusing element 102a. As long as the light diffuses light, the diffusing portion 102 of the optical element 100 may include a plurality of diffusing elements 102 a each curved in a concave shape toward the refracting portion 101. In this case, the diffusion unit 102 functions as a concave Fresnel lens having a substantially serrated cross section. Therefore, the thickness of the optical element 100 can be made thinner than when the diffusing element 102a is single.

  (8) As described with reference to FIGS. 12A and 12B, in the second modification, the refracting portion 71 has two refracting regions A7, but the refracting portion 71 is the refracting portion. As long as the light incident on 71 is refracted, the refracting portion 71 may include three or more refracting regions A7. In the third modification, the refracting portion 81 has two refracting regions A8. However, as long as the refracting portion 81 refracts the light incident on the refracting portion 81, the refracting portion 81 includes three or more pluralities. You may have refractive area A8. Furthermore, in the fourth modified example, the diffusion unit 92 has two diffusion regions A9. However, as long as the diffusion unit 92 diffuses the light incident on the diffusion unit 92, the diffusion unit 92 includes three or more It may have a diffusion region A9.

  (9) As described with reference to FIG. 2, in the present embodiment, the optical element 25 is inclined with respect to the optical axis LA. However, the optical element 25 may be orthogonal to the optical axis LA.

  (10) As described with reference to FIGS. 11A and 11B, in the first modification, the diffusion unit 62 includes the diffusion element 62a. However, as long as the light incident on at least a part of the diffusion portion 62 diffuses, the diffusion portion 62 may have a region where the diffusion element 62a is not located. The optical element 60 may have a plurality of refraction areas A7 and a plurality of diffusion areas A9. The optical element 60 may have a plurality of refraction areas A8 and a plurality of diffusion areas A9.

  (11) As described with reference to FIGS. 11A and 11B, in the first modification, each of the plurality of diffusing elements 62 a of the diffusing portion 62 protrudes away from the refracting portion 61. Curved. However, as long as the diffusing portion 62 has a concavo-convex shape, the diffusing portion 62 does not include a plurality of diffusing elements 62a, and may be subjected to a roughening process for diffusing light. Further, the diffusing unit 62 may be subjected to a graining process for diffusing light.

  The present invention relates to a lighting fixture and has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 5 Light source 7 Reflection part 15, 15A 1st reflection part 17 2nd reflection part 21 Internal reflection part 25, 60, 70, 80, 90, 100 Optical element 27 1st output opening part 27a Opening 27b Opening edge 28 Inner surface 28 Inner surface 30a 1st area | region 30b 2nd area | region 31 2nd incident opening part 43 2nd output opening part

Claims (6)

A light source;
A reflective portion having an inner surface that reflects light;
An internal reflection part that is installed inside the reflection part and reflects light;
The said internal reflection part is a lighting fixture curved in convex shape toward the internal space of the said reflection part. The reflection portion includes a first emission opening that emits light,
The first exit opening has an opening and an opening edge,
The lighting apparatus according to claim 1, wherein the internal reflection portion is adjacent to the opening edge of the first emission opening. The inner surface of the reflective portion has a first region and a second region facing the internal reflective portion,
The light fixture according to claim 1 or 2, wherein the light reflectance of the second region is larger than the light reflectance of the first region. The reflection part includes a first reflection part that reflects light,
The first reflecting portion includes a first emission opening that emits light;
The first exit opening has an opening;
The lighting fixture according to claim 1, wherein a position of a center of the opening of the first emission opening is different from a position of an optical axis of the light source in the opening. The reflection part includes a second reflection part that reflects light,
The second reflecting portion is
A second incident opening for incident light;
A second exit opening for emitting light,
The lighting apparatus according to any one of claims 1 to 4, wherein the second exit opening is inclined with respect to the second entrance opening.   The lighting fixture according to claim 5, further comprising an optical element that is installed corresponding to the second emission opening and refracts light.

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