CN112648555A

CN112648555A - Lighting apparatus

Info

Publication number: CN112648555A
Application number: CN202011016491.0A
Authority: CN
Inventors: 幅多洋次郎; 山田尚之
Original assignee: Koizumi Lighting Technology Corp
Current assignee: Koizumi Lighting Technology Corp
Priority date: 2019-10-11
Filing date: 2020-09-24
Publication date: 2021-04-13
Also published as: JP7345346B2; JP2021064480A

Abstract

The invention provides a lighting apparatus which can effectively irradiate light in a wide irradiation range by suppressing light loss. A lighting fixture (100) is provided with a housing (110) and a light source unit (120). The light source unit (120) is disposed inside the housing (110). The housing (110) has a light transmission section (110t) through which light emitted from the light source section (120) passes. The light source unit (120) is disposed so as to face the light-transmitting unit (110t) obliquely.

Description

Lighting apparatus

Technical Field

The present invention relates to a lighting fixture.

Background

The lighting device is not only used for irradiating light toward a person, but also used as so-called indirect lighting in which light is irradiated to a wall or the like as an irradiation target. A lighting device that irradiates a wall surface as an irradiation target is also referred to as a wall washer. In a wall-washer type lighting device, light emitted from a light source may be diffused to a wall surface by a reflecting member. In some lighting devices, light emitted from a light source is reflected at different angles by a reflecting member, and thus is irradiated to a wide range on a wall surface.

Disclosure of Invention

However, some lighting devices can irradiate light over a wide range, but in order to irradiate desired light on a wall surface, it is necessary to design a complicated reflection surface shape of the reflection plate in consideration of the positions of the LED and the reflection plate, and thus manufacturing is difficult. In such an illumination device, when light from the light source is reflected by the reflector, light loss occurs, and the light cannot be efficiently irradiated in a specific irradiation range.

The present invention has been made in view of the above problems, and an object thereof is to provide a lighting apparatus capable of efficiently irradiating light to a wide irradiation range while suppressing light loss.

The lighting apparatus of the present invention includes a housing and a light source unit disposed inside the housing. The housing has a light-transmitting portion that transmits light emitted from the light source portion. The light source unit is disposed so as to face the light transmission unit obliquely.

In one embodiment, the housing has a shielding portion that shields light emitted from the light source portion. The light transmission part has a light transmission surface which transmits the light emitted by the light source part. The light source unit is disposed at a position overlapping the shielding unit of the housing when viewed in a normal direction of the light transmission surface.

In one embodiment, the light source unit is disposed adjacent to a projection region generated by projecting the light transmission unit along the normal direction.

In one embodiment, the light source unit is disposed adjacent to a part of a projection region generated by projecting the light transmission unit along the normal direction.

In one embodiment, the light-transmitting portion has a rectangular shape defined by 4 outer edges, the light source portion includes a first light source, a second light source, and a third light source, and the first light source, the second light source, and the third light source are arranged along a projection portion resulting from projecting 3 outer edges of the 4 outer edges of the light-transmitting portion along the normal direction.

In one embodiment, the lighting fixture further includes a reflecting member disposed inside the housing.

In one embodiment, the reflecting member is disposed in a projection region formed by projecting the light transmitting portion along the normal direction.

In one embodiment, the light source unit includes a light source substrate on which a light emitting element is provided, and a cover member that covers the light source substrate. The light source substrate extends along a long side direction, and the cover member includes a groove portion in which a plurality of grooves extending along the long side direction are provided.

In one embodiment, the groove of the cover member is provided at a position facing a projection area generated by projecting the light transmission surface along the normal direction.

According to the lighting apparatus of the present invention, light can be efficiently irradiated over a wide irradiation range while suppressing light loss.

Drawings

Fig. 1(a) is a schematic perspective view of a lighting fixture of the present embodiment, and fig. 1(b) is a schematic perspective view of a usage mode of the lighting fixture of fig. 1 (a).

Fig. 2 is a schematic exploded perspective view of the lighting fixture of the present embodiment.

Fig. 3(a) is a schematic front view of the lighting fixture of the present embodiment, fig. 3(b) is a sectional view taken along line IIIB-IIIB in fig. 3(a), and fig. 3(c) is a sectional view taken along line IIIC-IIIC in fig. 3 (a).

Fig. 4(a) is a schematic diagram of light emitted from the first light source and the second light source of the lighting fixture of the present embodiment, fig. 4(b) is a schematic diagram of light emitted from the same light source as the first light source and the second light source for comparison in the case where the light source is placed directly on the light-transmitting portion, and fig. 4(c) is a schematic diagram of light emitted from the third light source of the lighting fixture of the present embodiment.

Fig. 5 is a schematic exploded perspective view of the lighting fixture of the present embodiment.

Fig. 6(a) is a schematic perspective view of a light source unit in the lighting fixture of the present embodiment, and fig. 6(b) is a schematic rear view of a cover member of the light source unit of fig. 6 (a).

Fig. 7 is a schematic sectional view taken along line VII-VII of fig. 6 (a).

Fig. 8(a) is a schematic diagram of light emitted from the light emitting element in the light source unit of the lighting apparatus of the present embodiment, and fig. 8(b) is a schematic diagram of light emitted from the light source unit of the lighting apparatus of the present embodiment.

Fig. 9 is a schematic exploded perspective view of the lighting fixture of the present embodiment.

Fig. 10(a) is a schematic cross-sectional view of the lighting fixture of the present embodiment along the X direction, and fig. 10(b) is a schematic cross-sectional view of the lighting fixture of the present embodiment along the Z direction.

Detailed Description

Hereinafter, embodiments of the lighting fixture according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. In the present specification, for the sake of easy understanding, X, Y, and Z axes orthogonal to each other are described. In general, the X and Y axes are parallel to the horizontal direction, and the Z axis is parallel to the vertical direction. In the present specification, for the sake of easy understanding, x, y, and z axes orthogonal to each other are described. In general, the x-axis is parallel to the longitudinal direction of the light source unit, and the y-axis and the z-axis are perpendicular to the longitudinal direction of the light source unit.

Referring to fig. 1, a lighting fixture 100 of the present embodiment will be described. Fig. 1(a) is a schematic perspective view of a lighting fixture 100 of the present embodiment. The lighting fixture 100 includes a housing 110 and a light source unit 120. The housing 110 has an inner space. The light source unit 120 emits light. The light source unit 120 is disposed inside the housing 110.

The housing 110 includes a shielding portion 110s and a light transmitting portion 110 t. The shielding portion 110s shields light, and the light transmitting portion 110t transmits light. The light transmitting portion 110t is surrounded by the shielding portion 110 s. The light emitted from the light source 120 is partially blocked by the blocking portion 110s, and the other part is selectively emitted from the housing 110 through the light transmitting portion 110 t.

The housing 110 has a substantially rectangular parallelepiped shape. The housing 110 has a front face 110a, a back face 110b, a top face 110c, a bottom face 110d, a right side face 110e, and a left side face 110 f. The light-transmitting portion 110t is provided in a part of the front surface 110a of the housing 110. For example, the transparent portion 110t is disposed vertically upward on the front surface 110a of the housing 110.

The light transmitting portion 110t has a light transmitting surface extending on the XZ plane. The normal direction of the light transmission surface is parallel to the Y direction.

In one example, the light transmitting portion 110t has a substantially rectangular shape. The outer edge of the light-transmitting portion 110t has an upper portion, a lower portion, and 2 side portions. The upper and lower portions of the light-transmitting portion 110t are parallel to the X direction, and the 2 side portions are parallel to the Z direction.

The light-transmitting portion 110t may be formed of a light-transmitting material. For example, the light-transmitting material contains a transparent resin or glass. Alternatively, the light-transmitting portion 110t may be an opening.

As described above, the light source unit 120 emits light. The light emitted from light source unit 120 passes through light transmitting portion 110t from the inside of case 110 and is emitted to the outside of case 110.

The light source unit 120 emits light along the optical axis. The light emitted from the light source unit 120 exits from the light source unit 120 within the range of the emission angle. In general, the optical axis of the light source unit 120 is located at the center of the exit angle. Therefore, when the distance from the light source unit 120 is constant, the light intensity on the optical axis of the light source unit 120 is larger than the light intensity around the optical axis. For example, the light source unit 120 includes a plurality of light emitting elements. The light emitting element includes a light emitting diode.

In the lighting fixture 100 of the present embodiment, the light source unit 120 is disposed so as to face the light-transmitting portion 110t obliquely. Thus, the lighting fixture 100 can efficiently irradiate light to an irradiation target facing the lighting fixture 100 over a wide irradiation range while suppressing light loss.

When the light transmitting surface of the light transmitting portion 110t is viewed from the normal direction (Y direction) of the light transmitting surface, the light source portion 120 is disposed at a position overlapping the shielding portion 110s as viewed in the Y axis direction. Therefore, the light source unit 120 is not visible when viewed from the outside of the housing 110 in the normal direction of the light transmission surface. Accordingly, the light source unit 120 is invisible when viewed from the normal direction of the light transmission surface, and glare (dazzling) of the irradiation light from the light source unit 120 can be suppressed.

The light source unit 120 is preferably disposed adjacent to a projection region generated by projecting the light transmitting portion 110t along a normal direction (y direction) of the light transmitting surface of the light transmitting portion 110 t. Thus, light from the light source unit 120 is emitted from the housing 110 with less loss.

The light source unit 120 includes a first light source 120A, a second light source 120B, and a third light source 120C. Each of the first light source 120A, the second light source 120B, and the third light source 120C is disposed adjacent to a projection region generated by projecting the light-transmitting portion 110 t.

For example, the first light source 120A extends in the Z direction and is located on the + X direction side with respect to the light transmitting portion 110 t. The second light source 120B extends in the Z direction and is located on the-X direction side with respect to the light transmitting portion 110 t. The third light source 120C extends in the X direction and is located on the-Z direction side with respect to the light transmitting portion 110 t.

The first light source 120A, the second light source 120B, and the third light source 120C each obliquely face the light-transmitting portion 110 t. Therefore, the light emitted from the first light source 120A and passing through the light transmitting portion 110t is irradiated to the-X direction side region of the light transmitting portion 110 t. The light emitted from the second light source 120B and having passed through the light transmitting portion 110t is irradiated to the region on the + X direction side of the light transmitting portion 110 t. Then, the light emitted from the third light source 120C and having passed through the light transmitting portion 110t is irradiated to the + Z direction side region of the light transmitting portion 110 t.

As described above, the light transmitting portion 110t may be an opening. However, the light-transmitting portion 110t of the opening is preferably covered with a light-transmitting material. In this case, the light transmitting material may be disposed inside the housing 110 or may be disposed outside the housing 110. The light-transmitting material may be a diffusing member that diffuses light. This enables the lighting fixture 100 to effectively expand the irradiation range of the light emitted from the light source unit 120.

The lighting fixture 100 preferably further includes a reflecting member 130. The reflective member 130 reflects the light. The reflecting member 130 is disposed inside the case 110.

In general, the reflective member 130 is white. For example, the reflecting member 130 is formed by applying a white paint on a metal plate.

The reflecting member 130 is, for example, a flat plate. Alternatively, the reflecting member 130 may be a plate member bent in the-Y direction along the Z direction.

The reflection member 130 is disposed to correspond to the light-transmitting portion 110 t. After the arrangement, when the transparent portion 110t is viewed from the front, at least a part of the reflecting member 130 overlaps the transparent portion 110 t. In this case, the reflecting member 130 is located in a projection region where the light transmitting portion 110t is projected along a normal direction of the light transmitting surface.

The reflecting member 130 is preferably disposed so that the entire reflecting member overlaps the light transmitting portion 110 t. Even if the light emitted from the light source unit 120 is returned to the inside of the housing 110 by reflection or the like before passing through the translucent portion 110t, the light can be emitted to the outside of the housing 110 after passing through the translucent portion 110t after being reflected by the reflecting member 130. Therefore, the light emitted from the light source unit 120 can be more effectively used by the reflecting member 130.

One or more of the first light source 120A, the second light source 120B, the third light source 120C, and the reflective member 130 are fixed inside the housing 110. For example, one or more of the first light source 120A, the second light source 120B, the third light source 120C, and the reflecting member 130 may be supported by the same member and fixed inside the housing 110.

The lighting fixture 100 of the present embodiment is preferably used for illuminating a wall or the like. Fig. 1(b) is a schematic perspective view of a usage mode of the lighting fixture 100 of the present embodiment. Here, the lighting fixture 100 irradiates the wall W.

The lighting fixture 100 irradiates light in the + Y direction as a whole. The lighting fixture 100 is disposed on the-Y direction side of the wall W. As is clear from fig. 1(a) and 1(b), the lighting fixture 100 can be applied to a wall W over a wider range than the light-transmitting portion 110 t.

Wherein a portion of the lighting fixture 100 is embedded in the ground. The light transmitting portion 110t of the housing 110 is disposed above the floor surface. The lighting fixture 100 may be disposed so as to be entirely exposed, instead of being partially embedded. For example, the lighting fixture 100 may be placed in the air by the support member.

The lighting fixture 100 may also be used as a wall washer for illuminating a wall surface. Alternatively, the lighting fixture 100 may be used as a floor washer for illuminating the floor.

Next, the lighting fixture 100 of the present embodiment will be described with reference to fig. 1 and 2. Fig. 2 is a schematic exploded perspective view of the lighting fixture 100 of the present embodiment. In addition, in order to avoid the drawing from being excessively complicated, a part of the right side surface 110e is omitted.

As shown in fig. 2, the housing 110 has a lid 112 and a receptacle 114. Housing 110 is formed by attaching cover 112 to receptacle 114.

The cover 112 has a plate shape provided with a light-transmitting portion 110t as an opening. The cover 112 constitutes the front face 110a of the housing 110. Also, the container 114 constitutes the rear surface 110b, the top surface 110c, the bottom surface 110d, the right side surface 110e, and the left side surface 110f of the case 110.

The container 114 is in the form of a box with an opening at one side. The shape of the outer edge of the open face of the receptacle 114 matches the shape of the outer edge of the lid 112. The container 114 houses therein a first light source 120A, a second light source 120B, and a third light source 120C. The container 114 may house the reflecting member 130. The outer peripheral surface of the container 114 serves as a shielding portion 110 s. On the other hand, the cover 112 is provided with a shielding portion 110s and a light transmitting portion 110 t.

By attaching the cover 112 to the container 114, the housing 110 can be formed that houses the first light source 120A, the second light source 120B, the third light source 120C, and the reflecting member 130.

The lighting fixture 100 preferably further includes a support member 140. The support member 140 is housed in the case 110. The supporting member 140 supports at least one of the first light source 120A, the second light source 120B, the third light source 120C, and the reflecting member 130. For example, the support member 140 supports the first light source 120A, the second light source 120B, the third light source 120C, and the reflection member 130 and fixes them inside the housing 110. The first light source 120A, the second light source 120B, the third light source 120C, and the reflection member 130 are mounted on the + Y direction side of the support member 140.

In fig. 2, the support member 140 is mounted on the top surface 110c of the housing 110. However, the support member 140 may be mounted on the rear surface 110b of the housing 110.

Next, the lighting fixture 100 of the present embodiment will be described with reference to fig. 1 to 3. Fig. 3(a) is a schematic front view of the lighting fixture 100 of the present embodiment, fig. 3(b) is a sectional view taken along line IIIB-IIIB in fig. 3(a), and fig. 3(c) is a sectional view taken along line IIIC-IIIC in fig. 3 (a). In fig. 3(a), the first light source 120A, the second light source 120B, the third light source 120C, and the reflecting member 130 housed in the casing 110 are shown by broken lines.

The light transmitting portion 110t has a light transmitting surface extending on the XZ plane. The normal direction of the light transmission surface is parallel to the Y direction. The first light source 120A, the second light source 120B, and the third light source 120C each obliquely face the light-transmitting portion 110 t.

The first light source 120A emits light along the optical axis La. The light emitted by the first light source 120A exits the first light source 120A over a range of exit angles. The optical axis La of the first light source 120A is located at the center of the exit angle. For example, the first light source 120A includes a plurality of light emitting elements. The light emitting element includes a light emitting diode.

The second light source 120B emits light along the optical axis Lb. The third light source 120C emits light along the optical axis Lc. The second light source 120B and the third light source 120C have the same structure as the first light source 120A.

The first light source 120A is disposed on the + X direction side and the-Y direction side of the light transmitting portion 110 t. The first light source 120A is disposed toward the light-transmitting portion 110 t. Therefore, the first light source 120A is disposed to be offset to the-X direction side with respect to the + Y direction. The optical axis La of the first light source 120A passes through the center of the light-transmitting portion 110t in the X direction.

The second light source 120B is disposed on the-X direction side and the-Y direction side of the light transmitting portion 110 t. The second light source 120B is disposed toward the light-transmitting portion 110 t. Therefore, the second light source 120B is disposed offset to the + X direction side with respect to the + Y direction. The optical axis Lb of the second light source 120B passes through the center of the light transmitting portion 110t in the X direction.

The third light source 120C is disposed on the-Z direction side and the-Y direction side of the light transmitting portion 110 t. The third light source 120C is disposed toward the light-transmitting portion 110 t. Therefore, the third light source 120C is disposed to be offset to the + Z direction side with respect to the + Y direction. The optical axis Lc of the third light source 120C passes through the center of the light-transmitting portion 110t in the Z direction.

As described above, the optical axes La, Lb, Lc of the first light source 120A, the second light source 120B, and the third light source 120C pass through the light-transmitting portion 110t obliquely. Further, the optical axes La, Lb, Lc of the first light source 120A, the second light source 120B, and the third light source 120C pass through the centers of the light transmitting portion 110t in the X direction and the Z direction. Thus, even if the emission angles of the first light source 120A, the second light source 120B, and the third light source 120C are relatively large, the irradiation target can be irradiated with most of the emission light of the first light source 120A, the second light source 120B, and the third light source 120C.

As shown in fig. 3(a), the first light source 120A is disposed on the + X direction side with respect to the projection region generated by projecting the transmissive portion 110 t. The optical axis La of the first light source 120A passes through the center of the light-transmitting portion 110t in the X direction. Therefore, the light emitted from the first light source 120A passes through the transparent portion 110t and is emitted to the outside of the housing 110.

The angle formed by the optical axis La of the first light source 120A and the light transmission surface of the light transmission portion 110t is preferably 45 ° or less. The angle may be 10 ° to 45 ° or less, or 15 ° to 40 ° or less. However, the angle formed by the optical axis La of the first light source 120A and the light transmission surface of the light transmission portion 110t may exceed 45 °.

Similarly, the second light source 120B is disposed on the-X direction side with respect to the projection region generated by projecting the light transmitting section 110 t. The optical axis Lb of the second light source 120B passes through the center of the light transmitting portion 110t in the X direction. Therefore, the light emitted from the second light source 120B passes through the transparent portion 110t and is emitted to the outside of the housing 110.

An angle formed by the optical axis Lb of the second light source 120B and the light transmission surface of the light transmission portion 110t is preferably 45 ° or less. The angle may be 10 ° to 45 ° or less, or 15 ° to 40 ° or less. However, the angle formed by the optical axis Lb of the second light source 120B and the light transmission surface of the light transmission portion 110t may exceed 45 °.

The third light source 120C is disposed on the-Z direction side with respect to the projection region generated by projecting the light transmitting section 110 t. The optical axis Lc of the third light source 120C passes through the center of the light-transmitting portion 110t in the Z direction. Therefore, the light emitted from the third light source 120C passes through the transparent portion 110t and is emitted to the outside of the housing 110.

An angle formed by the optical axis Lc of the third light source 120C and the light transmission surface of the light transmission portion 110t is preferably 45 ° or less. The angle may be 10 ° to 45 ° or less, or 15 ° to 40 ° or less. However, the angle formed by the optical axis Lc of the third light source 120C and the light transmission surface of the light transmission portion 110t may exceed 45 °.

Next, irradiation light of the lighting fixture 100 of the present embodiment will be described with reference to fig. 4. Fig. 4(a) is a schematic diagram of light emitted from the first light source 120A and the second light source 120B of the lighting fixture 100 of the present embodiment. Here, the lighting fixture 100 is disposed to face a wall W as an irradiation target.

As shown in fig. 4(a), the light emitted from the first light source 120A passes through the light transmitting portion 110t and is emitted to the outside of the housing 110. The light emitted at a specific range of emission angles with respect to the optical axis La of the first light source 120A is irradiated onto the wall W in an irradiation range La. In illumination apparatus 100 of the present embodiment, first light source 120A faces light-transmitting portion 110t obliquely. Therefore, the loss due to the light reflection can be suppressed, and the wall W can be efficiently irradiated with the wide irradiation range LA.

Similarly, the light emitted from the second light source 120B passes through the transparent portion 110t and is emitted to the outside of the housing 110. The light emitted at an exit angle in a specific range with respect to the optical axis Lb of the second light source 120B is irradiated onto the wall W in an irradiation range Lb. In the lighting apparatus 100 of the present embodiment, the second light source 120B faces the light transmitting portion 110t obliquely, and therefore, can efficiently irradiate the wall W with a wide irradiation range LB while suppressing loss due to light reflection.

However, the lighting fixture 100 of the present embodiment may emit the reflected light to the outside. For example, a part of the light emitted from the first light source 120A or the second light source 120B is reflected by the shielding portion 110s on the front surface 110A of the housing 110. However, by placing the reflective member 130 between the first light source 120A and the second light source 120B, the light reflected by the shielding portion 110s of the housing 110 can be emitted to the outside of the housing 110 as well. In the lighting fixture 100, the reflecting member 130 can emit light from the first light source 120A and the second light source 120B to a region between the irradiation ranges LA and LB.

As described above with reference to fig. 4(a), in the lighting fixture 100 of the present embodiment, each of the first light source 120A and the second light source 120B obliquely faces the light-transmitting portion 110 t. Therefore, the light emitted from the first light source 120A and the second light source 120B is irradiated to the wall W over a wide irradiation range LA and LB.

Here, for comparison, light emitted from the lighting fixture 800 will be described. Fig. 4(b) is a schematic diagram of light emitted from the lighting fixture 800 including the housing 810 and the light source 820. The housing 810 has a shielding portion 810s and a light-transmitting portion 810t, similar to the housing 110. The light source 820 has similar optical characteristics to the first and second

light sources

120A and 120B. However, the light source 820 is disposed to face the light-transmitting portion 810 t. Wherein the distance between the lighting fixture 800 and the wall W is equal to the distance between the lighting fixture 100 and the wall W.

As shown in fig. 4(b), the light source 820 is placed to face the light-transmitting portion 810 t. In this case, the light emitted from the light source 820 travels toward the light transmitting portion 810 t. Then, the light from the light source 820 is emitted to the outside of the housing 810 through the light transmitting portion 810 t. The light emitted at an emission angle in a specific range with respect to the optical axis Lx of the light source 820 is irradiated to the irradiation range Lx on the wall W.

In the lighting fixture 800, the light source 820 is directed toward the light-transmitting portion 810t, and loss due to light reflection is suppressed. Since the light source 820 faces the light-transmitting portion 810t, the light emitted at an emission angle in a specific range with respect to the optical axis Lx of the light source 820 is incident on the irradiation range Lx on the wall W.

As is clear from a comparison between fig. 4(a) and 4(b), in the lighting fixture 800, the light source 820 faces the light-transmitting portion 810t, and the irradiation range LX of the lighting fixture 800 is relatively small. In contrast, in the lighting fixture 100 of the present embodiment, the first light source 120A and the second light source 120B face the transparent portion 110t obliquely. Therefore, the wall W can be irradiated with the wide irradiation ranges LA and LB, while suppressing the loss due to the light reflection.

Fig. 4(C) is a schematic diagram of light emitted from the third light source 120C of the lighting fixture 100 of the present embodiment. As shown in fig. 4(C), the light from the third light source 120C passes through the light transmitting portion 110t and is emitted to the outside of the housing 110. The light emitted at an exit angle in a specific range with respect to the optical axis Lc of the third light source 120C is irradiated onto the wall W in an irradiation range Lc. In the lighting fixture 100 of the present embodiment, the third light source 120C faces the light transmitting portion 110t obliquely, and therefore, can efficiently irradiate the wall W with a wide irradiation range LC while suppressing loss due to light reflection.

In the above description with reference to fig. 3 and 4, the optical axes La, Lb, and Lc of the first light source 120A, the second light source 120B, and the third light source 120C pass through the centers of the transparent portion 110t in the X direction and the Z direction, but the present embodiment is not limited thereto. The optical axes La, Lb, and Lc of the first light source 120A, the second light source 120B, and the third light source 120C may not pass through the centers of the light transmitting portion 110t in the X direction and the Z direction. However, the optical axes La, Lb, Lc of the first light source 120A, the second light source 120B, and the third light source 120C preferably pass through the light-transmitting portion 110t at a position closer to the center in the X direction and the Z direction of the light-transmitting portion 110 t.

For example, when the optical axis La of the first light source 120A is shifted toward the-X direction side with respect to the center of the light transmitting portion 110t in the X direction and passes through the light transmitting portion 110t, a part of the light from the first light source 120A is reflected by the shielding portion 110s of the housing 110, and is not sufficiently emitted to the outside of the housing 110. Therefore, the optical axis La of the first light source 120A is preferably not excessively deviated to the-X direction side with respect to the center of the light transmitting portion 110t in the X direction.

Alternatively, when the optical axis La of the first light source 120A is shifted toward the + X direction side in the X direction of the light transmitting portion 110t and passes through the light transmitting portion 110t, the area of the irradiation range La is reduced. Therefore, the optical axis La of the first light source 120A is preferably not excessively shifted toward the + X direction side with respect to the center of the light transmitting portion 110t in the X direction.

In the above description with reference to fig. 2, the case 110 is composed of the container 114 and the cover 112, but the present embodiment is not limited thereto. The housing 110 may be formed of 3 or more members.

Next, the lighting fixture 100 of the present embodiment will be described with reference to fig. 1 and 5. Fig. 5 is a schematic exploded perspective view of the lighting fixture 100 of the present embodiment.

As shown in fig. 5, the housing 110 includes a cover 112a, a body portion 114a, and a frame 114 b. The container 114 is formed by combining the body portion 114a and the frame 114 b. Normally, the main body 114a is fitted after the frame 114b is combined with the cover 112 a. However, the cover 112a may be assembled after the body 114a is fitted to the frame 114 b. Thereby, the case 110 can be formed.

The cover 112a is formed of the front surface 110a, a part of the right side surface 110e, and a part of the left side surface 110f of the housing 110. The front surface 110a, a part of the right side surface 110e, and a part of the left side surface 110f are connected. The light transmitting portion 110t is provided on the front surface 110a of the housing 110.

The body portion 114a constitutes the top surface 110c of the housing 110. The reflecting member 130 is attached to the top surface 110 c. Here, the first light source 120A, the second light source 120B, and the third light source 120C are mounted on the + Y direction side of the reflective member 130, and the reflective member 130 supports the first light source 120A, the second light source 120B, and the third light source 120C. The reflecting member 130 functions as a supporting member.

The back surface facing portion 111b is connected to an end of the top surface 110c in the-Y direction and faces the reflecting member 130. A left facing portion 111f is coupled to an end of the top surface 110c in the + X direction.

The frame 114b constitutes the rear surface 110b, the bottom surface 110d, a part of the right side surface 110e, and a part of the left side surface 110f of the case 110. The back face 110b of the frame 114b is joined to the bottom face 110d, a portion of the right side face 110e, and a portion of the left side face 110 f.

The rear surface 110b, a part of the right side surface 110e, and a part of the left side surface 110f of the frame 114b are configured to be fitted into the top surface 110c of the body portion 114 a. By fitting the main body portion 114a into the frame 114b, the rear surface 110b of the frame 114b faces the rear surface facing portion 111b of the main body portion 114a, and a part of the left side surface 110f of the frame 114b faces the left side facing portion 111f of the main body portion 114 a.

As described above, the lighting fixture 100 may be manufactured by combining the main body portion 114a, the frame 114b, and the cover 112 a.

When the exit angle of the light emitted from the light source unit 120 disposed inside the housing 110 is too large, part of the emitted light cannot pass through the light transmitting portion 110t and be reflected by the shielding portion 110s into the housing 110, and cannot be emitted from the inside of the housing 110 to the outside. Therefore, the range of the emission angle of the light emitted from the light source unit 120 is preferably relatively narrow. On the other hand, from the viewpoint of cost and the like, a light emitting element having a relatively narrow emission angle may not be used in the light source unit 120. In such a case, it is preferable to control light emitted from the light emitting element having a relatively wide emission angle.

Next, the light source unit 120 in the lighting fixture 100 of the present embodiment will be described with reference to fig. 6 to 8. Fig. 6(a) is a schematic exploded perspective view of a light source unit 120 preferably used in the lighting fixture 100 of the present embodiment.

As shown in fig. 6(a), the light source unit 120 includes a light source substrate 122 and a cover member 124. The light source substrate 122 extends in the longitudinal direction (x direction).

The light source substrate 122 includes a substrate 122a and a light emitting element 122 b. The substrate 122a defines outer edges of the light source substrate 122 in the x-direction and the y-direction. The light emitting element 122b is disposed on the main surface of the substrate 122 a. The plurality of light emitting elements 122b are arranged on the main surface of the substrate 122a at predetermined intervals along the x direction.

The lid member 124 is a hollow-shaped container. The cover member 124 is transparent or light transmissive.

The opening portion of the cover member 124 corresponds to the outer edge of the substrate 122 a. The cover member 124 covers the substrate 122a together with the light emitting elements 122 b.

Fig. 6(b) is a schematic bottom view of the cover member 124. On the opening bottom surface of the cover member 124, a flat portion 124a and a groove portion 124b are provided. The flat portion 124a has a flat surface. The flat portion 124a is provided at approximately a half portion on the-y direction side in the opening bottom surface of the cover member 124. Several grooves are provided in the groove portion 124 b. The groove portion 124b is provided at substantially a half portion of the + y direction side in the opening bottom surface of the cover member 124. The groove portion 124b extends in the x direction like the substrate 122 a. The groove portion 124b greatly deflects incident light and emits the light. The groove portion 124b functions as a diffraction grating.

Fig. 7 is a schematic sectional view taken along line VII-VII of fig. 6 (a). The light emitting element 122b is disposed at the y-direction center of the substrate 122 a.

The cover member 124 is in the shape of a box with one side open. The cover member 124 has an outer peripheral surface 124p and an inner peripheral surface 124 q. As shown in fig. 7, the inner peripheral surface 124q includes a side surface 124q1, a main surface 124q2, and a side surface 124q 3. The main surface 124q2 is an open bottom surface of the cover member 124. Side 124q1 is located on the-y direction side of main surface 124q2, and side 124q3 is located on the + y direction side of main surface 124q 2.

In the main surface 124q2 of the cover member 124, a flat portion 124a is provided on the-y direction side. The flat portion 124a is flat.

In the main surface 124q2 of the cover member 124, a groove portion 124b is provided on the + y direction side. In the groove portion 124b, several rows of grooves 124v are alternately arranged along the y direction. The groove 124v extends along the x-direction. Among them, in the groove portions 124b of the cover member 124, 9 rows of grooves 124v are alternately arranged along the x direction.

Groove 124v includes lateral side d1 and medial side d 2. In the groove portion 124b, a plurality of outer side surfaces d1 and a plurality of inner side surfaces d2 are alternately arranged along the y direction, thereby forming a plurality of grooves 124 v.

The lower and upper portions in the z direction of the outer side surface d1 and the inner side surface d2 define a virtual first reference plane ds1 and a virtual second reference plane ds2, respectively. First reference plane ds1 is located on the-z direction side with respect to second reference plane ds 2.

As shown in fig. 7, the groove 124v is recessed outward from the center face of the cover member 124. In this case, the angle of the outer side surface d1 with respect to the second reference plane ds2 is larger than the angle of the inner side surface d2 with respect to the second reference plane ds 2.

The depth (length in the z direction) H of the groove 124v is smaller than the width (length in the y direction) W of the groove 124 v. For example, the width W is 1.1 to 5.0 times the depth H.

The light emitted from the light emitting element 122b and reaching the outer side surface d1 is reflected by the outer side surface d1, passes through the inner side surface d2, and travels in the + z direction and the-y direction. The light emitted from the light emitting element 122b and reaching the inner surface d2 is reflected by the inner surface d2 toward the outer surface d1, then reflected by the outer surface d1, and then travels in the + z direction and the-y direction through the inner surface d 2. In this way, the groove portion 124b located on the + y direction side with respect to the y direction center of the cover member 124 deflects the incident light toward the-y direction.

Next, light emitted from the light source unit 120 will be described with reference to fig. 6 to 8. Fig. 8(a) is a schematic view of the light source substrate 122 in the lighting fixture 100 of the present embodiment.

As described above, the light source substrate 122 includes the substrate 122a and the light emitting element 122 b. The light emitting element 122b is disposed on the substrate 122 a.

The substrate 122a is in a thin plate shape. Of the 2 main surfaces of the substrate 122a, the normal line of one main surface is oriented in the + z direction, and the normal line of the other main surface is oriented in the-z direction. The light-emitting element 122b is disposed at the center in the y direction on the main surface of the substrate 122a facing the + z direction. The light emitting element 122b emits light in the + z direction.

In fig. 8(a), a broken line extending from the light-emitting element 122b in the + z direction indicates an optical axis L0 of the light-emitting element 122 b. In fig. 8(a), the dotted line extending from the light-emitting element 122b in the-y direction and the + y direction with respect to the + z direction indicates the range of the emission angle of the light-emitting element 122 b. As shown in fig. 8(a), the light emitting element 122b emits light whose angles on both sides are equally spread.

In addition, as described above, the light emitting element 122b is covered with the cover member 124. In the case where the groove portion 124b is provided in the cover member 124, the groove portion 124b deflects the light from the light emitting element 122b to a specific direction.

Next, light emitted from the light source unit 120 will be described with reference to fig. 8 (b). Fig. 8(b) is a schematic diagram of the light source unit 120. The light source section 120 includes a light source substrate 122 and a cover member 124. The cover member 124 covers the light source substrate 122. Specifically, the cover member 124 covers the substrate 122a and the light emitting element 122b together.

In the cover member 124, a flat portion 124a is provided on the-y direction side, and a groove portion 124b is provided on the + y direction side.

As shown in fig. 8(b), light traveling from the light emitting element 122b toward the-y direction with respect to the + z direction passes through the flat portion 124a and is emitted to the outside. Strictly speaking, the light is refracted when it enters the flat portion 124a and when it exits from the flat portion 124a, and such light partially travels linearly as shown by transmitted light L1 in fig. 8 (b).

On the other hand, light traveling from the light emitting element 122b toward the + y direction with respect to the + z direction is greatly deflected by the groove portion 124b and emitted to the outside. In fig. 8(b), the deflected light L2 is a part of the light that travels after being deflected. The angle formed by the optical axis L0 of the light emitting element 122b and the transmitted light L1 is larger than the angle formed by the optical axis L0 of the light emitting element 122b and the deflected light L2. Therefore, when the deflected light L2 travels, the deflected light L2 intersects with the transmitted light L1.

When the exit angle of the light emitting element 122b is large, a component of the light emitted from the light emitting element 122b traveling at an angle away from the optical axis L0 may not pass through the light transmitting portion 110t of the housing 110 but be reflected by the shielding portion 110 s. However, according to the cover member 124 provided with the recessed groove portion 124b, a component of the light emitted from the light emitting element 122b traveling at an angle away from the optical axis L0 can be deflected to pass through the light transmitting portion 110t of the housing 110, and therefore the light emitted from the light emitting element 122b can be effectively utilized. When the light source unit 120 including the cover member 124 (the cover member 124 is provided with the recessed groove portion 124B described above with reference to fig. 6(B) to 8 (B)) is used as the first light source 120A, the second light source 120B, and the third light source 120C of the lighting fixture 100, the recessed groove portion 124B is preferably disposed at a position facing the projection region generated by the projection light-transmitting portion 110 t. The groove portion 124b of the cover member 124 is disposed on the inner side and the flat portion 124a is disposed on the outer side with respect to the projection region generated by projecting the transparent portion 110 t.

The lighting fixture 100 of the present embodiment will be described below with reference to fig. 6 to 10. Fig. 9 is a schematic exploded perspective view of the lighting fixture 100 of the present embodiment. Fig. 10(a) is a schematic cross-sectional view of the lighting fixture 100 of the present embodiment along the X direction, and fig. 10(b) is a schematic cross-sectional view of the lighting fixture 100 of the present embodiment along the Z direction. The lighting fixture 100 of fig. 9 and 10 has the same configuration as the lighting fixture 100 shown in fig. 2, 3(b), and 3(c), except that the cover member 124 of the light source unit 120 is provided with the recessed portion 124b along with the flat portion 124a, and redundant description is omitted to avoid unnecessary redundancy. In addition, in fig. 9 and 10, it should be noted that a recessed portion 124b can be seen on the cover member 124 of the light source section 120, which is different from fig. 6 (a).

As shown in fig. 9 and 10(a), in the first light source 120A, the groove portion 124b of the cover member 124 is disposed on the-X direction side, and the flat portion 124a is disposed on the + X direction side. In this way, by disposing the recessed groove portion 124b of the first light source 120A inside the housing 110, the light emitted from the light emitting element 122b and traveling away from the light transmitting portion 110t can be deflected toward the light transmitting portion 110t as the deflected light La2, and therefore, the light emitted from the light emitting element 122b can be effectively utilized.

As shown in fig. 10(a), in the second light source 120B, the groove portion 124B of the cover member 124 is disposed on the + X direction side, and the flat portion 124a is disposed on the-X direction side. In this way, by disposing the recessed groove portion 124B of the second light source 120B inside the housing 110, the light emitted from the light emitting element 122B and traveling away from the transparent portion 110t can be deflected toward the transparent portion 110t as the deflected light Lb2, and therefore, the light emitted from the light emitting element 122B can be effectively utilized.

As shown in fig. 10(b), in the third light source 120C, the groove portion 124b of the cover member 124 is disposed on the + Z direction side, and the flat portion 124a is disposed on the-Z direction side. In this way, by disposing the recessed groove portion 124b of the third light source 120C inside the housing 110, the light emitted from the light emitting element 122b and traveling away from the light transmitting portion 110t can be deflected toward the light transmitting portion 110t as the deflected light Lc2, and therefore, the light emitted from the light emitting element 122b can be effectively utilized.

In addition, in the case where the groove portion 124b is provided on the inner side of the cover member 124 in the first light source 120A, the optical axis La0 of the light emitting element 122b in the first light source 120A is preferably a portion located on the-X direction side with respect to the center in the X direction of the light transmitting portion 110 t. The recessed groove portion 124b can deflect the light emitted from the light emitting element 122b and traveling away from the light transmitting portion 110t toward the light transmitting portion 110t, and therefore the light emitted from the light emitting element 122b can be utilized more effectively. Most of the light traveling in the direction shifted to the + y direction side with respect to the optical axis La0 of the light emitting element 122b can pass through the light transmitting portion 110t as transmitted light La 1. Therefore, the light emitted from the light emitting element 122b can be used more effectively.

Similarly, in the case where the recess portion 124B is provided on the inner side of the cover member 124 in the second light source 120B, the optical axis Lb0 of the light emitting element 122B in the second light source 120B is preferably a portion located on the + X direction side with respect to the center in the X direction of the light-transmitting portion 110 t. Most of the light traveling in the direction shifted to the + y direction side with respect to the optical axis Lb0 of the light emitting element 122b can pass through the transparent portion 110t as the transmitted light Lb 1. Therefore, the light emitted from the light emitting element 122b can be used more effectively.

In the case where the recessed portion 124b is provided on the inner side of the cover member 124 in the third light source 120C, the optical axis Lc0 of the light emitting element 122b in the third light source 120C preferably passes through a portion located on the + Z direction side with respect to the center in the Z direction of the light transmitting portion 110 t. Most of the light traveling in the direction shifted to the + y direction side with respect to the optical axis Lc0 of the light emitting element 122b can pass through the light transmitting portion 110t as transmitted light Lc 1. Therefore, the light emitted from the light emitting element 122b can be used more effectively.

In the above description with reference to fig. 1 to 10, the first light source 120A, the second light source 120B, and the third light source 120C are disposed to correspond to 2 sides and a lower portion of the outer edge of the light-transmitting portion 110t, but the present embodiment is not limited thereto. Any one of the first light source 120A, the second light source 120B, and the third light source 120C may be configured to correspond to an upper portion of outer edges of the light-transmitting portion 110 t.

In the above description with reference to fig. 1 to 10, the light source unit 120 includes 3 light sources, but the present embodiment is not limited thereto. The light source unit 120 may include 1 or 2 light sources. Alternatively, the light source unit 120 may include 4 or more light sources. In addition, in the case where the light source section 120 includes 4 light sources, the light sources may be disposed adjacent to an upper portion, a lower portion, and 2 side portions of the outer edge of the rectangular shape of the light-transmitting section 110t, respectively.

As described above, the embodiments of the present invention are explained with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and can be implemented in various ways within a range not departing from the gist thereof. Further, various inventions can be formed by appropriately combining several constituent elements of the inventions in the above embodiments. For example, several components may be deleted from all the components shown in the embodiments. For convenience of understanding, the drawings mainly schematically show the respective components, and for convenience of drawing, the number of the respective components and the like may be different from those in reality. The components shown in the above embodiments are merely examples, are not particularly limited, and various modifications can be made without substantially departing from the effects of the present invention.

Claims

1. A lighting device comprising a housing and a light source unit disposed in the housing,

the housing has a light-transmitting portion that transmits light emitted from the light source portion,

the light source unit is disposed so as to face the light transmission unit obliquely.

2. The lighting apparatus according to claim 1,

the housing has a shielding portion that shields the light emitted from the light source portion,

the light transmission part has a light transmission surface which transmits the light emitted from the light source part,

the light source unit is disposed at a position overlapping the shielding unit of the housing when viewed in a normal direction of the light transmission surface.

3. The lighting apparatus according to claim 2,

the light source unit is disposed adjacent to a projection region generated by projecting the light transmission unit along the normal direction.

4. The lighting apparatus according to claim 3,

the light source unit is disposed adjacent to a part of a projection region generated by projecting the light transmission unit along the normal direction.

5. The lighting apparatus according to claim 4,

the light-transmitting portion is a rectangular shape defined by 4 outer edges,

the light source section includes a first light source, a second light source, and a third light source,

the first light source, the second light source, and the third light source are arranged along a projection portion that is generated by projecting 3 outer edges of 4 outer edges of the light-transmitting portion along the normal direction.

6. The lighting apparatus according to any one of claims 2 to 5,

the lighting fixture further includes a reflecting member disposed inside the housing.

7. The lighting apparatus according to claim 6,

the reflecting member is disposed in a projection region formed by projecting the light transmitting portion along the normal direction.

8. The lighting apparatus according to claim 2,

the light source unit includes a light source substrate on which a light emitting element is provided, and a cover member covering the light source substrate,

the light source substrate extends along a long side direction,

the cover member includes a groove portion in which a plurality of grooves extending in the longitudinal direction are provided.

9. The lighting apparatus according to claim 8,

the groove of the cover member is disposed at a position facing a projection area generated by projecting the light transmission surface along the normal direction.