JP6912914B2 - lighting equipment - Google Patents

Description

The present invention relates to a luminaire.

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

The reflector has a reflective surface for the wall surface. The wall-facing reflective surface reflects the light from the light source toward the wall surface. The reflection surface for the wall surface is divided into three upper and lower parts according to the function, and in this order from the bottom, the first reflection surface (hereinafter, referred to as "lower end reflection surface"), the second reflection surface, and the third reflection surface. Has. 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 of the wall surface (including the inside corner) can be improved.

Japanese Unexamined Patent Publication No. 2016-51528

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 increases. In addition, the lower end reflecting surface is curved so that the lower end edge of the lower end reflecting surface approaches the optical axis. Furthermore, the lower end reflecting surface is a curved surface that is concavely curved so as to be separated from the optical axis in a cross-sectional view.

Therefore, for example, when the luminaire is installed near the wall surface, the light reflected by the lower end reflecting surface tends to concentrate on the area of the wall surface close to the ceiling. That is, the brightest part where the light is concentrated is generated in the 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 improve the light distribution to the upper region of the wall surface and to prevent the spread of light to the lower region of the wall surface from becoming too small. Is to provide.

The luminaire disclosed in the present application includes a light source, a reflection unit, an internal reflection unit, and an optical element . The reflecting portion has an inner surface that reflects light. The internal reflecting portion is installed inside the reflecting portion so as to be biased to one side with respect to the optical axis of the light source , and reflects light. The optical element is arranged between the light source and the internal reflection portion, and refracts the light from the light source to the other side opposite to the one side. The internal reflection portion is curved in a convex shape toward the internal space of the reflection portion. The internal reflecting portion has a plurality of reflecting surfaces. The plurality of reflecting surfaces are arranged around the optical axis of the light source.

In the luminaire disclosed in the present application, it is preferable that the reflecting portion includes a first exit opening for emitting light. The first exit opening preferably has an opening and an opening edge. The internal reflection portion is preferably adjacent to the opening edge of the first exit opening.

In the luminaire disclosed in the present application, it is preferable that the inner surface of the reflecting portion has 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 luminaire disclosed in the present application, it is preferable that the reflecting portion includes a first reflecting portion that reflects light. The first reflecting portion preferably includes a first emitting opening for emitting light. The first exit opening preferably has an opening. The position of the center of the opening of the first exit opening is preferably different from the position of the optical axis of the light source in the opening.

In the luminaire disclosed in the present application, it is preferable that the reflecting portion includes a second reflecting portion that reflects light. The second reflecting portion preferably includes a second incident opening for incident light and a second exit opening for emitting light. The second exit opening is preferably inclined with respect to the second incident opening.

A lighting fixture disclosed in the present application, the optical element is preferably provided in correspondence with the second exit opening.

According to the present invention, it is possible to improve the light distribution to the upper region of the wall surface and suppress the spread of light to the lower region of the wall surface from becoming too small.

It is a side view which shows the lighting equipment which concerns on embodiment of this invention. It is a side sectional view which shows the lighting equipment which concerns on embodiment. It is a perspective view which shows the luminaire when looking up at the luminaire which concerns on embodiment. It is an exploded perspective view which shows the lighting equipment which concerns on embodiment. It is a side sectional view which shows the room where the lighting equipment which concerns on embodiment is installed. (A) is a perspective view which shows the internal reflection part which concerns on embodiment. (B) is a plan 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 showing the lighting equipment according to the embodiment. It is a bottom view which shows the lighting equipment 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 enlarged cross-sectional view taken along the line XB-XB of FIG. 10A showing the optical element according to the embodiment. (A) is a perspective view which shows the optical element which concerns on 1st modification of embodiment. (B) is an enlarged cross-sectional view taken along the line XIB-XIB of FIG. 11A showing 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. (B) is an enlarged cross-sectional view taken along the line XIIB-XIIB of FIG. 12A showing the optical element according to the second modification. (A) is a perspective view which shows the optical element which concerns on the 3rd modification of embodiment. (B) is an enlarged cross-sectional view taken along the line XIIIB-XIIIB of FIG. 13A showing the optical element according to the third modification. (A) is a perspective view which shows the optical element which concerns on 4th modification of embodiment. (B) is an enlarged cross-sectional view taken along the line XIVB-XIVB of FIG. 14A showing the optical element according to the fourth modification. (A) is a perspective view which shows the optical element which concerns on 5th modification of embodiment. (B) is an enlarged cross-sectional view showing an optical element according to a fifth modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and the description is not repeated. Further, in the embodiment, the X-axis and the Y-axis of the three-dimensional Cartesian 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 direction opposite to the direction of gravity and indicates the upward direction, and the negative direction of the Z-axis is the direction of gravity and indicates the downward direction.

The lighting fixture 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 10 (b). FIG. 1 is a side view showing the lighting fixture 1. As shown in FIG. 1, the luminaire 1 emits light. In the present embodiment, the luminaire 1 is a wall washer downlight. The luminaire 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 mounting members 11 (four mounting members 11 in this 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 the heat generated by the light source 5 by the plurality of fins. Therefore, the heat sink 3 suppresses an abnormal temperature rise of the light source 5. The heat dissipation is heat dissipation.

The reflector 4 reflects light. Specifically, the reflector 4 includes a holding portion 6 and a reflecting portion 7. The holding portion 6 holds the base end portion of the heat sink 3. The reflecting unit 7 reflects the light emitted by the light source 5 and emits it toward the outside of the luminaire 1. The frame body 9 has a substantially cylindrical shape and supports the reflector 4. Each of the mounting members 11 is mounted on the frame body 9. Each of the mounting members 11 is, for example, a leaf spring.

The frame body 9 is inserted into the mounting hole OP formed in the ceiling C. Then, each of the mounting members 11 comes into contact with the wall surface around the mounting 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 luminaire 1 is attached to the ceiling C.

Note that FIG. 1 shows the mounting member 11 before it comes into contact with the wall surface around the mounting hole OP in order to facilitate understanding of the shape of the mounting member 11.

Next, the internal structure of the luminaire 1 will be described with reference to FIGS. 2 to 4. FIG. 2 is a side sectional view showing the luminaire 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.

As shown in FIGS. 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 unit 5b and passes through the center of the light emitting unit 5b. In this embodiment, the optical axis LA is along the vertical direction. The substrate 5a is attached to a substantially central portion of the base end surface of the heat sink 3. The light emitting portion 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. The light emitting element is an LED (Light Emitting Diode) in the present embodiment. The light emitting unit 5b is a COB (Chip on Board) type. The COB type is a type in which a light emitting portion 5b is formed by sealing a plurality of LEDs with a phosphor. The light emitting unit 5b may be of the SMD (Surface Mount Device) type. In the SMD type, an LED and a phosphor are integrated into one unit to form an LED chip, and a plurality of LED chips are placed on a mounting surface of the substrate 5a and electrically connected to a conductive pattern of the substrate 5a to form a light emitting unit. It is a type that forms 5b.

The reflective portion 7 is hollow and has an inner surface 28. The inner surface 28 reflects the light emitted by the light source 5 and emits the light toward the outside of the luminaire 1.

The reflection portion 7 has a first exit opening 27 and a second incident opening 31. The first incident opening 41 will be described later. The second incident opening 31 faces the light source 5 and incidents the light emitted by 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. Further, the second incident opening 31 is substantially orthogonal to the optical axis LA.

The first exit opening 27 emits the light emitted from the light source 5 and incident from the second incident opening 31 to the outside of the luminaire 1. Specifically, the first exit opening 27 has an opening 27a and an opening edge 27b. The opening edge 27b has a substantially circular shape. The first exit opening 27 and the second incident opening 31 are substantially parallel to each other. Further, the first exit opening 27 is substantially orthogonal to the optical axis LA.

The reflecting portion 7 preferably includes a first reflecting portion 15 and a second reflecting portion 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 first reflecting portion 15 is hollow and has an inner surface 29 that reflects light. The inner surface 29 constitutes the inner surface 28 of the reflecting portion 7. Further, the first reflecting portion 15 has a substantially oblique conical shape. The obliquely cut conical shape is a shape obtained by cutting the conical shape with an inclined surface that is inclined with respect to the conical axis. Further, the first reflecting portion 15 includes a first exit opening 27 and a first incident opening 41. The first exit opening 27 of the first reflection portion 15 functions as the first exit opening 27 of the reflection portion 7.

The first incident opening 41 incidents 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 incident opening 41 is inclined with respect to the first exit opening 27. Further, 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 FD of the luminaire 1. That is, the first incident opening 41 is inclined in the pitch direction with respect to the first exit opening 27. However, the first incident opening 41 is not inclined in the roll direction with respect to the first exit opening 27.

The forward FD of the luminaire 1 indicates a direction from the side of the luminaire 1 toward the side of the wall Wa. The forward FD points in the negative direction of the X-axis. The pitch direction with respect to the first incident opening 41 indicates the 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 a 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 a rotation 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. Also, front and back and left and right are defined with respect to the forward FD.

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

As shown in FIGS. 2 to 4, the second reflecting unit 17 reflects light. Specifically, the second reflecting portion 17 is hollow and has an inner surface 33 that 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 mirror-reflects the light in order to efficiently reflect the light. Therefore, the inner surface 28 is subjected to, for example, a reflection process such as silver coating or a reflection process such as glossy metal plating. Further, the material of the second reflecting portion 17 may have a color having a high light reflectance such as silver. The inner surface 28 may be white. Therefore, the inner surface 28 may be subjected to a reflection process such as white coating. Further, the color of the material of the second reflecting portion 17 may be white.

The second reflecting portion 17 includes a second incident opening 31 and a second exit 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 exit opening 43 emits light. Specifically, the second exit 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 incident opening 31. Further, the second exit opening 43 is inclined with respect to the optical axis LA.

Specifically, as shown in FIG. 2, the second exit opening 43 is inclined upward toward the front FD of the luminaire 1. That is, the second exit opening 43 is inclined in the pitch direction with respect to the second incident opening 31. However, the second exit opening 43 is not inclined in the roll direction with respect to the second incident opening 31.

The pitch direction with respect to the second exit opening 43 indicates the rotation direction around the left and right axes of the second exit opening 43. In FIG. 2, the left-right axis of the second exit opening 43 is parallel to the Y-axis. Further, the roll direction with respect to the second exit opening 43 indicates the rotation direction around the front-rear axis of the second exit 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 exit opening 43 indicates the rotation direction around the vertical axis of the second exit 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. Also, front and back and left and right are defined with respect to the forward FD.

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

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

The asymmetric reflection portion 17b is formed in the second reflection portion 17 because the second exit opening 43 is inclined with respect to the second incident opening 31. Then, the luminaire 1 is attached to the ceiling C so that the longest vertical surface 34a of the inner surface 34 of the asymmetric reflection portion 17b is farther from the wall Wa than the optical axis LA. Then, the asymmetric reflection portion 17b extends toward the first exit opening 27 from the symmetry reflection portion 17a. Therefore, of the inner surface 34 of the asymmetric reflection portion 17b, a region having a relatively large area faces the wall Wa side. As a result, according to the present embodiment, light can be effectively emitted toward the wall Wa.

As shown in FIGS. 2 to 4, the first reflecting portion 15 and the second reflecting portion 17 are coupled. Specifically, the first reflecting portion 15 and the second reflecting portion 17 are coupled so that the first incident opening 41 and the second exit opening 43 face each other.

Further, the luminaire 1 further includes an internal reflection unit 21. The internal reflection unit 21 reflects light.

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

The light emitted from the second exit opening 43 is incident from the first incident opening 41. As a result, a 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 emitted from the first exit opening 27. Further, a part of the light incident from the first incident opening 41 is reflected by the internal reflecting portion 21 and emitted from the first exit opening 27.

The internal reflection unit 21 is installed inside the reflection unit 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 unit 21 is installed inside the first reflection unit 15 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 first reflection portion 15. Further, the internal reflection portion 21 is installed inside the first reflection portion 15 on the side of the shortest inclined surface 29b among the side of the longest inclined surface 29a and the side of the shortest inclined surface 29b.

Further, the internal reflection portion 21 is adjacent to the opening edge 27b of the first exit opening 27. Therefore, according to the present embodiment, the 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 exit opening 27. Further, the internal reflection portion 21 projects into the opening 27a of the first exit opening 27.

Further, the luminaire 1 may further include a decorative plate 23. The decorative plate 23 is attached to the bottom of the internal reflection portion 21. The decorative plate 23 and the internal reflection portion 21 may be formed by integral molding.

Further, it is preferable that the luminaire 1 further includes an optical element 25. The optical element 25 is made of, for example, synthetic resin or glass. 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 the present embodiment, light can be emitted more effectively toward the wall Wa.

The optical element 25 is installed corresponding to the first incident opening 41 and the second exit 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 exit opening 43. For example, the optical element 25 is sandwiched between the first reflecting unit 15 and the second reflecting unit 17. Therefore, the light emitted from the second exit opening 43 is refracted by the optical element 25 and is incident from the first incident opening 41.

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

Next, with reference 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 of the room R is the illuminating object of the luminaire 1 and the general luminaire. Further, the wall surface Ws of the wall Wa is the illumination area of the luminaire 1 and the general luminaire.

In a general luminaire, since the lower end reflecting surface of the reflector is curved in a concave shape, the spread of light in the vertical downward direction is relatively small. Therefore, when the luminaire is installed in the vicinity of the wall surface Ws, the light reflected by the lower end reflecting surface of the reflector tends to concentrate in the region of the wall surface Ws close to the ceiling C. As a result, the brightest portion G2 in which the light is concentrated is generated in the region of the wall surface Ws close to the ceiling C.

On the other hand, in the luminaire 1, since the internal reflection portion 21 is curved in a convex shape, the spread of light in the vertical downward direction is larger than that of a general luminaire. Therefore, even when the luminaire 1 is installed in the vicinity of the wall surface Ws, it is possible to prevent the light reflected by the internal reflecting portion 21 from concentrating in the region of the wall surface Ws close to the ceiling C. As a result, the brightest portion G1 in which the light is concentrated is generated below the region of the wall surface Ws close to the ceiling C. That is, the brightest portion G1 of the luminaire 1 is generated below the brightest portion G2 of the general luminaire.

Therefore, it is possible to suppress insufficient illuminance of light in the lower region Wd of the upper region Wu and the lower region Wd of the wall surface Ws. That is, it is possible to prevent 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, the light distribution to the lower region Wd of the wall surface Ws can be improved as compared with a general lighting fixture.

In addition, in the luminaire 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 too far from the entrance corner K between the wall surface Ws and the ceiling C. Can be suppressed. That is, it is possible to prevent the brightest portion G1 in which the light is concentrated from being generated at a position too far from the corner K. Therefore, according to the present embodiment, the light distribution to the inner corner K and the upper region Wu of the wall surface Ws can be improved. The upper region Wu of the wall surface Ws includes a part of the inside corner K.

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

Next, the internal reflection unit 21 will be described with reference to FIGS. 5 and 6. 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. 6 (a) to 6 (c), the internal reflection unit 21 has a plurality of reflection surfaces RS. Then, the plurality of reflecting surfaces RS are arranged around the optical axis LA. Therefore, not only can the light spread in the vertical 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 the illumination range can 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 unit 21 has three reflection surfaces RS. When the three reflecting surfaces RS will be described separately, the three reflecting surfaces RS will be referred to as a first reflecting surface 21a, a second reflecting surface 21b, and a third reflecting surface 21c, respectively. The number of reflecting surfaces RS may be one, or may be a plurality of reflecting surfaces other than three. Further, the plurality of reflecting surfaces RS may be separated from each other.

Each of the reflecting surfaces RS preferably mirror-reflects the light in order to efficiently reflect the light. Therefore, each of the reflective surfaces RS is subjected to, for example, a reflection process such as silver coating or a reflection process such as glossy metal plating. Further, the material of the internal reflecting portion 21 may have a color having a high light reflectance such as silver. Each of the reflecting surfaces RS may be white. Therefore, each of the reflective surfaces RS may be subjected to a reflective process such as white coating. Further, the color of the material of the internal reflection portion 21 may be white.

Each of the reflecting surfaces RS is formed by a part of a spherical surface and faces diagonally upward. Therefore, each of the reflecting surfaces RS is curved in a convex shape toward the internal space of the reflecting portion 7 (specifically, the first reflecting 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 a plan view.

The reflecting 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 reflective surface RS may be part of an aspherical surface. For example, the reflective surface RS may form part of a parabola, part of an ellipse, or part of a hyperbola in cross-sectional view.

Next, the relationship between the first reflecting unit 15 and the optical axis LA will be described with reference to FIGS. 5, 7 (a), and 7 (b). 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. 7 (a) and 7 (b), the opening 27a of the first exit opening 27 has a radius d2. The position of the central CT of the opening 27a of the first exit opening 27 is different from the position of the optical axis LA at the opening 27a. Specifically, the central CT of the opening 27a and the optical axis LA at the opening 27a are separated by a distance d1.

Therefore, as compared with the case where the optical axis LA passes through the central CT of the opening 27a, among the light incident from the first incident opening 41, the first exit opening 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 central CT of the opening 27a, when the incident angle of the optical BM2 becomes equal to or greater than the angle value θ, the optical BM2 incidents on the first reflecting portion 15. Therefore, the light BM2 is not emitted directly toward the wall Wa. On the other hand, when the position of the center CT of the opening 27a and the position of the optical axis LA at the opening 27a are different, 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. It is emitted directly toward the wall Wa without doing so. As a result, light can be emitted more effectively toward the wall Wa. The angle value θ indicates an angle value in the traveling direction of light 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. 5 and 8. FIG. 8 is a bottom view showing the lighting fixture 1. In FIG. 8, for the sake of simplification of the drawing, the decorative plate 23 is omitted, and the internal reflection portion 21 is shown by a chain double-dashed line.

As shown in FIG. 8, the inner surface 29 of the reflecting portion 7 has a first region 30a and a second region 30b. In FIG. 8, dot hatching is provided in the first region 30a 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 30a faces the opening 27a of the first exit opening 27 and does not face the internal reflection portion 21. On the other hand, the second region 30b faces the internal reflection portion 21. The light reflectance of the second region 30b is larger than the light reflectance of the first region 30a. Therefore, glare (that is, glare) can be suppressed by the first region 30a having a relatively small light reflectance, and light can be expanded 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 amount of emitted light to the amount of incident light.

The first region 30a reflects light slightly, for example. On the other hand, the second region 30b reflects, for example, the light incident from the first incident opening 41 and directly incident on the second region 30b. Then, the second region 30b spreads and emits light from the first exit 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 mirror-reflects the light in order to efficiently reflect the light.

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

Next, the first reflection unit 15 and the first reflection unit 15A as a modification of the first reflection unit 15 will be described with reference to FIGS. 5, 9 (a), and 9 (b). FIG. 9A is a side view showing the first reflecting portion 15. As shown in FIG. 9A, in the side view, the first reflecting portion 15 has an 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 angle with respect to the optical axis LA. The angle θa formed by the inclined surface 29b is substantially the same. Then, for example, the first reflecting portion 15 is formed by cutting the hollow truncated cone 45 with the plane PL1. The plane PL1 is inclined with respect to the lower base of the truncated cone 45.

FIG. 9B is a side view showing the first reflecting portion 15A according to the modified example. As shown in FIG. 9B, in the first reflecting portion 15A, in the side view, the angle θb formed by the longest inclined surface 29a of the first reflecting portion 15A with respect to the optical axis LA is the third with respect to the optical axis LA. 1 It is larger than the angle θc formed by the shortest inclined surface 29b of the reflecting portion 15A. Then, for example, the first reflecting portion 15A is formed by cutting the hollow truncated cone 45 between the flat surface PL2 and the flat surface PL3. The plane PL2 and the plane PL3 are inclined with respect to the lower base of the truncated cone 45 and are non-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, since the angle θb of the first reflecting portion 15A 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, the amount of light incident on the longest inclined surface 29a is reduced, so that the light emitted from the first exit opening 27 of the first reflecting portion 15A and directed toward the wall Wa (FIG. 5) is the first reflecting portion. It is more than the light emitted from the first exit opening 27 of 15 and directed toward the wall Wa. As a result, according to the modified example, 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 cross-sectional view taken along the line XB-XB of FIG. 10A showing the optical element 25. In FIG. 10B, diagonal lines showing a cross section of the optical element 25 are omitted for simplification of the drawings. Further, in FIG. 10B, for convenience of explanation, only the light LT0 incident on the optical element 25 along the normal VL of the optical element 25 is shown. The normal 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 refracting portion 51. The refracting portion 51 faces the light source 5 (FIG. 2). The refracting portion 51 refracts the light incident on the refracting portion 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 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 unit 53. The refracting portion 51 and the transmitting portion 53 are integrally molded to form an optical element 25. It should be noted that the integral molding of the refracting portion 51 and the transmitting portion 53 of the present embodiment is an example.

The refracting unit 51 refracts light. That is, the refracting portion 51 bends the light so that the light is biased in the predetermined direction D. In the present specification, the refracting portion 51 bends the light so that the light is biased in a predetermined direction D with respect to the normal VL. That is, the refracting portion 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 the present specification, bending light means changing the traveling direction of light. The predetermined direction D intersects the normal VL. In the present specification, the predetermined direction D is orthogonal to the normal VL.

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

The refracting 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 refracting 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 refracting element 51a is refracted toward the object to be illuminated. The magnitude of the angle θ0 can be determined, for example, by changing the width W of the refracting element 51a and / or the height H of the refracting element 51a. In the present specification, the width of the refracting element 51a indicates the length of the refracting element 51a along the direction orthogonal to the thickness direction TA. Further, the height of the refracting element 51a indicates the length of the refracting element 51a along the thickness direction TA.

The transmitting unit 53 transmits light. The transmitting portion 53 and the refracting portion 51 are adjacent to each other. The surface 52a of the transmission portion 53 is, for example, a flat surface. In addition, for example, the surface 52a of the transmission portion 53 may be textured.

The light LT0 emitted by the light source 5 is incident on the inclined surface 51b of the refracting element 51a. The refracting element 51a refracts the light LT0 incident on the refracting element 51a so that the light LT0 incident on the inclined surface 51b faces the wall Wa side. The light LT0 refracted by the refracting element 51a is incident on the transmitting portion 53. The transmitting portion 53 transmits the light LT0 incident on the transmitting portion 53 and emits the light LT0.

As described above with reference to FIGS. 2, 5, 10 (a), and 10 (b), the refracting portion 51 is inclined by an angle θ0 with respect to the thickness direction TA of the optical element 25. Includes refraction element 51a. The refracting element 51a is formed so that the light LT0 incident on the refracting element 51a is refracted toward the side of the wall Wa. Therefore, the light can be emitted more effectively toward the wall Wa.

Next, the luminaire 1 according to the first modification to the fifth modification of the present invention will be described with reference to FIGS. 2, 5 and 11 (a) to 15 (b). In addition, in FIG. 11 (b), FIG. 12 (b), FIG. 13 (b), FIG. 14 (b), and FIG. 15 (b), diagonal lines showing cross sections are omitted for simplification of the drawings. Of the light incident on the optical element, only the light incident along the normal VL of the optical element is shown in the figure. The normal VL is orthogonal to the optical element. Further, as shown in FIG. 5, a case where the luminaire 1 is attached to the ceiling C and the object to be illuminated by the luminaire 1 is the wall Wa of the room R to which the luminaire 1 is attached will be described as an example. ..

(First modification)
The luminaire 1 according to the first modification of the present invention will be described with reference to FIGS. 2, 5, 11 (a), and 11 (b). The luminaire 1 according to the first modification is different from the luminaire 1 shown in FIG. 2 in that it includes an optical element 60 instead of the optical element 25. Hereinafter, the luminaire 1 according to the first modification will be mainly described as being different from the luminaire 1 shown in FIG.

FIG. 11A is a perspective view showing the optical element 60 of the luminaire 1 according to the first modification. FIG. 11B is an enlarged cross-sectional view taken along the line XIB-XIB of FIG. 11A showing the optical element 60.

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

The diffusion unit 62 faces the refraction unit 61. The refracting portion 61 is closer to the light source 5 (FIG. 2) than the diffusing portion 62. The diffusing unit 62 diffuses the light. As used herein, diffusion of light is a concept that includes spreading or scattering light. Light scattering indicates that light is scattered by diffuse reflection or the like. Specifically, the light refracted by the refracting portion 61 is incident on the diffusing portion 62. Then, the diffusing unit 62 diffuses the light incident on the diffusing unit 62 so as to diffuse and emit the light incident on the diffusing unit 62. Therefore, the light emitted by the light source 5 is refracted by the refracting portion 61 toward the wall Wa side, diffused by the diffusing portion 62, and then directly emitted from, for example, the luminaire 1. As a result, it is possible to suppress the occurrence of illuminance unevenness on the wall surface Ws as compared with the case where the refracted light is directly emitted from the luminaire 1.

Specifically, in the example of FIG. 11B, the diffuser 62 scatters light. In the first modification, the diffusion portion 62 is formed by providing minute irregularities on the light emitting surface of the diffusion portion 62. That is, the diffusion portion 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 convexly curved so as to be separated from the refracting portion 61 to diffuse light. In the example of FIG. 11B, the diffusing element 62a scatters light. The diffusion element 62a is substantially circular in cross-sectional view. In the first modification, the diffusion element 62a is substantially spherically missing. However, the shape of the diffusing element 62a may be any shape as long as the diffusing element 62a diffuses the light incident on the diffusing element 62a. Further, in the first modification, the plurality of diffusion elements 62a are arranged in a grid pattern. However, the plurality of diffusion elements 62a may be arranged in a staggered pattern, or may be arranged arbitrarily. In the first modification, the diffuser 62 functions as a diffusion lens.

The light LT1 emitted by the light source 5 is incident on the inclined surface 61b of the refracting element 61a. The refracting element 61a refracts the light LT1 incident on the refracting element 61a so that the light LT1 incident on the inclined surface 61b faces the wall Wa side. The light LT1 refracted by the refracting element 61a is incident on the transmitting portion 63. The transmitting portion 63 transmits the light LT1 incident on the transmitting portion 63. The light LT1 transmitted by the transmitting portion 63 is incident on the diffusion element 62a. The diffusing element 62a diffuses the light LT1 incident on the diffusing element 62a. The diffusing element 62a emits the light LT1 diffused by the diffusing element 62a as the light LD1.

As described above with reference to FIGS. 11A and 11B, according to the first modification, the diffusion portion 62 is a diffusion element 62a that is convexly curved so as to be separated from the refraction portion 61. including. Therefore, the diffusing unit 62 can diffuse the light LT1 incident on the diffusing unit 62. As a result, the illuminance of the wall surface Ws of the wall Wa becomes substantially uniform, and it is possible to suppress the occurrence of illuminance unevenness on the wall surface Ws. For example, when the lighting fixture 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, and the wall surface. It is possible to suppress the occurrence of uneven illuminance 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 the optical element 70 is provided instead of the optical element 25. Hereinafter, the luminaire 1 according to the second modification will be mainly described in that it differs from the luminaire 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. 12 (b) is a schematic cross-sectional view of the optical element 70 along the line XIIB-XIIB of FIG. 12 (a).

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

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

Further, the refracting portion 71 includes a plurality of refracting elements 71a. The refracting element 71a refracts light. The refracting element 71a has a substantially triangular shape (specifically, a substantially right-angled triangular shape) in a cross-sectional view. The refracting element 71a has a substantially triangular columnar shape and extends along one direction (in the second modification, the Y-axis direction). The plurality of refracting elements 71a are substantially parallel. Hereinafter, in the second modification, the refraction element 71a located in the first refraction region A71 will be referred to as the first refraction element 71a1, and the refraction element 71a located in the second refraction region A72 will be referred to as the second refraction element 71a2.

The shape of the first refracting element 71a1 is different from the shape of the second refracting element 71a2. Specifically, the inclined surface 71b1 of the first refracting 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 refracting 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 and the inclination angle θ3 of the inclined surface 71b2 are different, the shape of the first refracting element 71a1 and the shape of the second refracting element 71a2 are different. Show different.

The first refracting element 71a1 refracts the light LT2 incident on the first refracting element 71a1 by an angle θ4 with respect to the thickness direction TA of the optical element 70. On the other hand, the second refracting element 71a2 refracts the light LT3 incident on the second refracting 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. Therefore, the first refracting element 71a1 refracts the light LT2 incident on the first refracting element 71a1 toward the upper region Wu side of the wall Wa which is the object to be illuminated. On the other hand, the second refracting element 71a2 refracts the light LT3 incident on the second refracting element 71a2 toward the lower region Wd side of the wall Wa.

Each of the light LT2 refracted by the first refracting element 71a1 and the light LT3 refracted by the second refracting element 71a2 are incident on the transmitting portion 73. The transmitting portion 73 transmits the light LT2 and the light LT3 incident on the transmitting portion 73. The light LT2 and the light LT3 transmitted by the transmitting portion 73 are incident on the diffusion element 72a. The diffusing element 72a diffuses the light LT2 and the light LT3 incident on the diffusing element 72a. The diffusing element 72a emits the light LT2 diffused by the diffusing element 72a as the optical LD2, and emits the light LT3 diffused by the diffusing element 72a as the optical LD3. The light LD2 and the light LD3 emitted by the diffusion element 72a are directly emitted from, for example, the luminaire 1. Then, the light LD2 irradiates the upper region Wu of the wall Wa as an object to be illuminated. On the other hand, the light LD3 irradiates the lower region Wd of the wall Wa as an object to be illuminated.

As described above with reference to FIGS. 12 (a) and 12 (b), according to the second modification, the first refraction element located in the first refraction region A71 of the plurality of refraction regions 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, as compared with the case where the shapes of the plurality of refracting elements 71a are all the same shape, the illumination region of the light emitted from the optical element 70 is expanded. As a result, the lighting area of the luminaire 1 is expanded.

Further, according to the second modification, the light emitted by the luminaire 1 is diffused. Therefore, the illuminance in the illumination region of the luminaire 1 can be uniformly irradiated. As a result, it is possible to suppress the occurrence of uneven illuminance in the illumination region of the luminaire 1.

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

(Third modification example)
A third modification of the present embodiment will be described with reference to FIGS. 2, 5, 13 (a), and 13 (b). The luminaire 1 according to the third modification is different from the luminaire 1 shown in FIG. 2 in that it includes an optical element 80 instead of the optical element 25. Hereinafter, the luminaire 1 according to the third modification will be mainly described as being different from the luminaire 1 shown in FIG.

FIG. 13A is a plan view showing the refracting portion 81 of the optical element 80 according to the third modification. 13 (b) is a schematic cross-sectional view of the optical element 80 along the line XIIIB-XIIIB of FIG. 13 (a). 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 unit 81, a diffusion unit 82, and a transmission unit 83. The diffusion unit 82 faces the refraction unit 81. The refracting portion 81 is closer to the light source 5 (FIG. 2) than the diffusing portion 82. The transmission portion 83 is located between the diffusion portion 82 and the refraction portion 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). Further, the configuration of the diffusion unit 82 is the same as the configuration of the diffusion unit 62 described with reference to FIGS. 11 (a) and 11 (b). Therefore, the description of the configuration of the transmission unit 83 and the configuration of the diffusion unit 82 will be omitted.

The refracting unit 81 refracts light. The refraction unit 81 has a plurality of refraction regions A8. In the third modification, the refraction portion 81 has two refraction regions A8. Hereinafter, in the third modification, one of the two refraction regions A8 will be referred to as a third refraction region A83, and the other of the two refraction regions A8 will be referred to as a fourth refraction region A84. The third refraction region A83 and the fourth refraction region A84 are adjacent to each other. The luminaire 1 is arranged so that the third refraction region A83 is closer to the first illuminating object of the luminaire 1 than the fourth refraction region A84. That is, in the third modification, the third refraction region A83 is closer to the wall Wa than the fourth refraction region A84.

Further, the refracting portion 81 includes a plurality of refracting elements 81a. Each of the plurality of refracting elements 81a refracts light. Each of the plurality of refracting elements 81a 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 a cross-sectional view. The refracting element 81a has a substantially triangular columnar shape and extends along one direction (in the third modification, the Y-axis direction). The plurality of refracting elements 81a are substantially parallel. Hereinafter, in the third modification, the refraction element 81a located in the third refraction region A83 will be referred to as a third refraction element 81a3, and the refraction element 81a located in the fourth refraction region A84 will be referred to as a fourth refraction element 81a4. The third refracting element 81a3 has an inclined surface 81b3, and the fourth refracting element 81a4 has an inclined surface 81b4.

The shape of the third refracting element 81a3 is different from the shape of the fourth refracting element 81a4. Specifically, the inclined surface 81b3 of the third refracting 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 refracting element 81a4 is inclined by an 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 inclined direction of the inclined surface 81b3 and the inclined direction of the inclined surface 81b4 are different, it indicates that the shape of the third refracting element 81a3 and the shape of the fourth refracting element 81a4 are different.

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

The light LT4 refracted by the third refracting element 81a3 and the light LT5 refracted by the fourth refracting element 81a4 are incident on the transmitting portion 83. The transmitting portion 83 transmits the light LT4 and the light LT5 incident on the transmitting portion 83. The light LT4 and the light LT5 transmitted by the transmitting portion 83 are incident on the diffusion element 82a. The diffusing element 82a diffuses the light LT4 and the light LT5 incident on the diffusing element 82a. The diffusing element 82a emits the light LT4 diffused by the diffusing element 82a as the optical LD4, and emits the light LT5 diffused by the diffusing element 82a as the optical LD5. The light LD4 and the light LD5 emitted by the diffusion element 82a are emitted directly from, for example, the luminaire 1. Then, the light LD2 irradiates the wall Wa as the first illumination object. On the other hand, the light LD3 irradiates the floor F as the second illumination object.

As described above with reference to FIGS. 13 (a) and 13 (b), according to the third modification, the third refraction element located in the third refraction region A83 of the plurality of refraction regions 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. Therefore, as compared with the case where the shapes of the plurality of refracting elements 81a are all the same shape, the illumination region of the light emitted from the optical element 80 is expanded. As a result, the lighting area of the luminaire 1 is expanded. For example, the luminaire 1 can irradiate the wall Wa and the floor F.

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

Further, according to the third modification, the light emitted by the luminaire 1 is diffused. Therefore, the illuminance in the illumination region of the luminaire 1 can be irradiated substantially uniformly. As a result, it is possible to suppress the occurrence of uneven illuminance in the illumination region 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 luminaire 1 according to the fourth modification is different from the luminaire 1 shown in FIG. 2 in that it includes an optical element 90 instead of the optical element 25. Hereinafter, the luminaire 1 according to the fourth modification will be mainly described as being different from the luminaire 1 shown in FIG.

FIG. 14A is a plan view showing the diffusion portion 92 of the optical element 90 according to the fourth modification. 14 (b) is a schematic cross-sectional view of the optical element 90 along the XIVB-XIVB line of FIG. 14 (a).

As shown in FIGS. 14 (a) and 14 (b), the optical element 90 includes a refraction unit 91, a diffusion unit 92, and a transmission unit 93. The diffusion unit 92 faces the refraction unit 91. The diffuser 92 diffuses the light. In the example of FIG. 14B, the diffuser 92 scatters light. The refracting portion 91 is closer to the light source 5 (FIG. 2) than the diffusing portion 92. The transmission portion 93 is located between the diffusion portion 92 and the refraction portion 91. The transmitting unit 93 transmits light. The configuration of the refracting portion 91 and the configuration of the transmitting portion 93 are the same as the configuration of the refracting portion 91 and the configuration of the transmitting portion 93 described with reference to FIGS. 10 (a) and 10 (b), respectively. Therefore, the description of the configuration of the refracting portion 91 and the configuration of the transmitting portion 93 will be omitted.

The diffusion unit 92 has a plurality of diffusion regions A9. In the fourth modification, the diffusion unit 92 has two diffusion regions A9. Hereinafter, in the fourth modification, one of the two diffusion regions A9 will be referred to as the first diffusion region A91, and the other of the two diffusion regions A9 will be referred to as the second diffusion region A92. The first diffusion region A91 and the second diffusion region A92 are adjacent to each other. The luminaire 1 is arranged so that the first diffusion region A91 is closer to the illumination object of the luminaire 1 than the second diffusion region A92. That is, in the fourth modification, 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 diffusion elements 92a is convexly curved so as to be separated from the refracting portion 91. The diffusion element 92a is substantially circular in cross-sectional view. The diffusion element 92a is substantially spherical.

Hereinafter, in the fourth modification, the diffusion element 92a located in the first diffusion region A91 will be referred to as the first diffusion element 92a1, and the diffusion element 92a located in the second diffusion region A92 will be referred to as the 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. Further, the size of the first diffusion element 92a1 is smaller than the size of the second diffusion element 92a2. That is, the number of the first diffusion elements 92a1 per unit area of the first diffusion region A91 is larger than the number of the second diffusion elements 92a2 per unit area of the second diffusion region A92. The plurality of first diffusion elements 92a1 are arranged in a grid pattern in, for example, the first diffusion region A91, and the plurality of second diffusion elements 92a2 are arranged in a grid pattern in, for example, the second diffusion region A92. The plurality of first diffusion elements 92a1 may be arranged in a staggered manner, or may be arbitrarily arranged.

The refracting element 91a refracts each of the light LT6 and the light LT7 incident on the refracting 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 refracting element 91a are incident on the transmitting portion 93. The transmitting portion 93 transmits the light LT6 and the light LT7 incident on the transmitting portion 93. The light LT6 transmitted by the transmitting portion 93 is incident on the first diffusion element 92a1. On the other hand, the light LT7 transmitted by the transmitting portion 93 is incident on the second diffusion element 92a2.

The first diffusing element 92a1 diffuses the light LT6 incident on the first diffusing 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 by the first diffusion element 92a1 and the light LD7 emitted by the second diffusion element 92a2 are emitted directly from, for example, the luminaire 1. The optical LD6 is more widely diffused than the optical LD7. Then, the light LD6 and the light LD7 irradiate the wall Wa as an object to be illuminated.

As described above with reference to FIGS. 14 (a) and 14 (b), according to the fourth modification, the first diffusion element located in the first diffusion region A91 of 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 size of the illumination area of the light LD6 emitted by the first diffusion element 92a1 is different from the area of the illumination area of the light LD7 emitted by the second diffusion element 92a2. As a result, the illuminance in the illumination region by the optical LD6 and the illuminance in the illumination region by the optical LD7 become more uniform than in the case where the optical LD6 and the optical LD7 are diffused to the same extent, and the illuminance unevenness in the illumination region of the luminaire 1. Can be suppressed from occurring. Specifically, it is as follows.

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

(Fifth modification)
A fifth modification of the present embodiment will be described with reference to FIGS. 2, 5, 15 (a), and 15 (b). The luminaire 1 according to the fifth modification is different from the luminaire 1 shown in FIG. 2 in that it includes an optical element 100 instead of the optical element 25. Hereinafter, the luminaire 1 according to the fifth modification will be mainly described as being different from the luminaire 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. 15 (a) and 15 (b), the optical element 100 includes a refraction unit 101, a diffusion unit 102, and a transmission unit 103. The diffusion unit 102 faces the refraction unit 101. The diffuser 102 diffuses the light. In the fifth modification, the diffuser 102 spreads the light. The refracting portion 101 is closer to the light source 5 (FIG. 2) than the diffusing portion 102. The transmission unit 103 is located between the diffusion unit 102 and the refraction unit 101. The transmitting 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 FIGS. 10 (a) and 10 (b), respectively. Therefore, the description of the configuration of the refracting portion 101 and the configuration of the transmitting portion 103 will be omitted.

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

The refracting element 101a refracts the light LT8 incident on the refracting element 101a by an angle θ11 with respect to the thickness direction TA of the optical element 100. The light LT8 refracted by the refracting element 101a is incident on the transmitting portion 103. The transmission unit 103 transmits the light LT8 incident on the transmission unit 103. The light LT8 transmitted by the transmitting portion 103 is incident on the diffusion element 102a. The diffusing element 102a diffuses the light LT8 incident on the diffusing 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 diffusion element 102a is emitted directly from, for example, the luminaire 1. Then, the light LD8 irradiates the wall Wa as an object to be illuminated.

As described above with reference to FIGS. 15 (a) and 15 (b), according to the fifth modification, the diffusion portion 102 has a diffusion element 102a that curves concavely toward the refraction portion 101. .. Therefore, the light emitted from the optical element 100 is diffused. Specifically, the light spreads. As a result, it is possible to suppress the occurrence of uneven illuminance in the illumination region 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 aspects without departing from the gist of the present invention (for example, (1) to (11) shown below). In addition, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be removed from all the components shown in the embodiments. In addition, components across different embodiments may be combined as appropriate. In order to make the drawings easier to understand, each component is schematically shown, and the thickness, length, number, spacing, etc. of each component shown are actual for the convenience of drawing creation. May be different. Further, the material, shape, dimensions, etc. of each component shown in the above embodiment are merely examples, and are not particularly limited, and various changes can be made without substantially deviating from the effects of the present invention. be.

(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 at an angle 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 side. 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. Instead of providing the first reflecting portion 15, the second reflecting portion 17 may be provided, and the internal reflecting portion 21 may be installed inside the second reflecting portion 17. Either one of the first reflecting portion 15 and the second reflecting portion 17 may be provided without providing the optical element 25. Either one of the symmetrical reflecting portion 17a and the asymmetric reflecting portion 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. 11 (a) and 11 (b), in the present embodiment, the diffusion portion 62 has a diffusion element 62a that is convexly curved so as to be separated from the refraction portion 61. did. However, as long as the diffusing portion 62 diffuses the light incident on the diffusing portion 62, the diffusing portion 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 disk shape, or may have a milky white color.

(5) As described with reference to FIGS. 14 (a) and 14 (b), in the fourth modification, the diffusion portion 92 includes a first diffusion element 92a1 and a second diffusion element 92a2 having different shapes. is. However, as long as the light emitted from the first diffusion region A91 is diffused in 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 properties of the first diffusion element 92a1 may be different from the properties 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 diffusing portion 92 is formed of a resin mixed with a light diffusing material that diffuses light. At this time, the density of the light diffusing material contained in the first diffusion region A91 is higher than the density of the light diffusing material contained in the second diffusion region A92. Further, for example, the diffuser 92 has a milky white color. Therefore, the light that has passed through the first diffusion region A91 is diffused in 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 uneven illuminance in the illumination region of the luminaire 1.

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

(7) As described with reference to FIGS. 15 (a) and 15 (b), in the fifth modification, the diffusion unit 102 of the optical element 100 includes a single diffusion element 102a, but the diffusion unit 102. As long as the optical element 100 diffuses light, the diffusing portion 102 of the optical element 100 may include a plurality of diffusing elements 102a, each of which is concavely curved toward the refracting portion 101. In this case, the diffuser 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 diffusion element 102a is singular.

(8) As described with reference to FIGS. 12 (a) and 12 (b), in the second modification, the refraction portion 71 has two refraction regions A7, but the refraction portion 71 has a refraction portion 71. As long as the light incident on the 71 is refracted, the refracting portion 71 may have a plurality of refracting regions A7 of three or more. Further, in the third modification, the refracting portion 81 has two refracting regions A8, but as long as the refracting portion 81 refracts the light incident on the refracting portion 81, the refracting portion 81 has three or more plurality of refracting portions 81. It may have a refraction region A8. Further, in the fourth modification, the diffusing portion 92 has two diffusing regions A9, but as long as the diffusing portion 92 diffuses the light incident on the diffusing portion 92, the diffusing portion 92 has a plurality of 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 tilted 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. 11 (a) and 11 (b), in the first modification, the diffusion unit 62 includes a diffusion element 62a. However, as long as the light incident on at least a part of the diffusing portion 62 is diffused, the diffusing portion 62 may have a region in which the diffusing element 62a is not located. Further, the optical element 60 may have a plurality of refraction regions A7 and a plurality of diffusion regions A9. Further, the optical element 60 may have a plurality of refraction regions A8 and a plurality of diffusion regions A9.

(11) As described with reference to FIGS. 11 (a) and 11 (b), in the first modification, each of the plurality of diffusion elements 62a of the diffusion portion 62 is convex so as to be separated from the refraction portion 61. It was curved like a shape. However, as long as the diffusing portion 62 has an uneven shape, the diffusing portion 62 does not include a plurality of diffusing elements 62a and may be roughened to diffuse light. Further, the diffusing portion 62 may be textured to diffuse light.

The present invention relates to a luminaire and has industrial applicability.

1 Lighting equipment 5 Light source 7 Reflector 15, 15A 1st reflector 17 2nd reflector 21 Internal reflector 25, 60, 70, 80, 90, 100 Optical element 27 1st exit opening 27a Opening 27b Opening edge 28 Inner surface 30a 1st region 30b 2nd region 31 2nd incident opening 43 2nd exit opening

Claims (6)

Light source and
A reflective part with an inner surface that reflects light,
An internal reflection unit that is installed inside the reflection unit so as to be biased to one side with respect to the optical axis of the light source and reflects light.
An optical element arranged between the light source and the internal reflection portion and refracting the light from the light source to the other side opposite to the one side is provided.
The internal reflection portion is curved in a convex shape toward the internal space of the reflection portion.
The internal reflecting portion has a plurality of reflecting surfaces and has a plurality of reflecting surfaces.
A luminaire in which the plurality of reflecting surfaces are arranged around the optical axis of the light source. The reflective portion includes a first exit opening that emits light.
The first exit opening has an opening and an opening edge.
The luminaire according to claim 1, wherein the internal reflection portion is adjacent to the opening edge of the first exit opening. The inner surface of the reflective portion has a first region and a second region facing the internal reflective portion.
The luminaire 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 reflecting portion includes a first reflecting portion that reflects light, and the reflecting portion includes a first reflecting portion.
The first reflecting portion includes a first emitting opening for emitting light.
The first exit opening has an opening and
The luminaire according to claim 1, wherein the position of the center of the opening of the first exit opening is different from the position of the optical axis of the light source in the opening. The reflecting portion includes a second reflecting portion that reflects light, and the reflecting portion includes a second reflecting portion.
The second reflecting portion is
The second incident opening that injects light and
Includes a second exit opening that emits light
The luminaire according to any one of claims 1 to 4, wherein the second exit opening is inclined with respect to the second incident opening. The optical element is disposed in correspondence with said second exit aperture, lighting apparatus according to claim 5.

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