JP2020191256A - Luminaire - Google Patents

Abstract

To provide a luminaire that can efficiently distribute light of a light source in an intended direction, and can restrain occurrence of luminance unevenness.SOLUTION: An luminaire according to an embodiment comprises: a light guide plate that is a plate-like member including a first principal surface from which light is mainly emitted, a second principal surface on the side opposite to the first principal surface, a first end surface intersecting with the first principal surface and the second principal surface, and a second end surface on the side opposite to the first end surface, and comprises a concave part formed in the second principal surface; and a light source housed in the concave part. The concave part of the light guide plate is formed separately from the first end surface and close to the second end surface. The light guide plate comprises a reflecting surface extending in a direction intersecting with a light guide direction from the first principal surface in at least a place closer to the side of the second end surface than the light source, and reflecting light of the light source in the direction of the first end surface.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a luminaire, and more particularly to a luminaire with a light guide plate.

Conventionally, a lighting fixture including a light source such as an LED (Light Emitting Diode) and a light guide plate that guides the light of the light source in a direction along a light emitting surface is widely known. For example, Patent Document 1 discloses a luminaire provided with a light guide plate including a recess for accommodating a light source. The light guide plate of Patent Document 1 is formed with a conical recess or a V-shaped groove having an isosceles triangular cross section at a position corresponding to the recess of the light guide plate, and the conical recess radiates light from a light source. The V-shaped groove reflects the light of the light source to the left and right of the groove.

Japanese Unexamined Patent Publication No. 2006-351375

By the way, in a lighting fixture provided with a light guide plate, it is an important issue to be able to irradiate uniform light with no uneven brightness. Further, it may be required to efficiently distribute the light of the light source in a specific direction of the light guide plate.

An object of the present disclosure is to provide a luminaire capable of efficiently distributing the light of a light source in a specific direction for a purpose and suppressing the occurrence of uneven brightness.

The luminaire according to one aspect of the present disclosure intersects a first main surface from which light is mainly emitted, a second main surface opposite to the first main surface, and the first main surface and the second main surface. A plate-shaped member including a first end surface and a second end surface opposite to the first end surface, a light guide plate having a recess formed on the second main surface, and a light source housed in the recess. Be prepared. The recess is formed closer to the second end surface away from the first end surface, and the light guide plate intersects the light guide direction from the first main surface at least on the second end surface side of the light source. It has a reflecting surface that extends in the direction of the light source and reflects the light of the light source in the direction of the first end surface.

According to one aspect of the present disclosure, it is possible to provide a lighting fixture capable of efficiently distributing the light of a light source in a specific direction for a purpose and suppressing the occurrence of uneven brightness.

It is a top view of the lighting fixture which is an example of an embodiment. FIG. 5 is a sectional view taken along line AA in FIG. It is a top view of the luminaire which is another example of embodiment. It is sectional drawing of the light guide plate which is an example of Embodiment. It is sectional drawing of the light guide plate which is another example of Embodiment. It is sectional drawing of the light guide plate which is another example of Embodiment.

Hereinafter, an example of the embodiment of the luminaire of the present disclosure will be described in detail with reference to the drawings. It is assumed from the beginning that the components of the plurality of embodiments described below are selectively combined. In the present specification, the description of "abbreviation" is intended to include a state of being completely orthogonal and a state of being substantially orthogonal, to explain by taking orthogonality as an example.

FIG. 1 is a plan view of the lighting fixture 10 which is an example of the embodiment, and is a view seen from the side of the first main surface 21 which is the light emitting surface of the light guide plate 20 (diffusion cover 13 and the reflective member 28). Not shown). FIG. 2 is a sectional view taken along line AA in FIG.

As illustrated in FIGS. 1 and 2, the luminaire 10 includes a light guide plate 20 having a recess 25 and a light source 11 housed in the recess 25. The light guide plate 20 has a first main surface 21 that mainly emits light, a second main surface 22 that is opposite to the first main surface 21, and a first end surface 23 that intersects the first main surface 21 and the second main surface 22. , And a plate-shaped member including the second end surface 24 opposite to the first end surface 23, which guides the light of the light source 11 in the direction along the first main surface 21.

As will be described in detail later, the recess 25 of the light guide plate 20 is formed on the second main surface 22 near the second end surface 24 away from the first end surface 23. Further, the light guide plate 20 extends from the first main surface 21 in a direction intersecting the light guide direction at least on the second end surface 24 side of the light source 11, and reflects the light of the light source 11 in the direction of the first end surface 23. It has a reflecting surface 29 to make it. In the present specification, the light guide direction of the light guide plate 20 is a direction along the first main surface 21 which is a light emitting surface, and particularly means a direction in which the first end surface 23 and the second end surface 24 are aligned.

The luminaire 10 generally has a housing 12 and a diffusion cover 13 attached to the housing 12. In the example shown in FIG. 1, the light guide plate 20 having an annular shape in a plan view is fixed to the housing 12 having a circular shape in a plan view. A through hole 27 is formed at the center of the light guide plate 20 in the radial direction to avoid interference with a connector, a lighting device, and the like, which will be described later. The light guide plate 20 is arranged with its center X (center of the through hole 27) located at the center of the bottom surface portion 12A of the housing 12 and the second main surface 22 facing the bottom surface portion 12A side.

The lighting fixture 10 has a structure in which a light guide plate 20 and the like are housed in a space surrounded by a housing 12 and a diffusion cover 13. The housing 12 has a bottomed cylindrical shape and is mounted on the ceiling with the opening facing vertically downward. The diffusion cover 13 has a function of hiding the light guide plate 20 and the like and further diffusing the light emitted from the first main surface 21 of the light guide plate 20. A milky white translucent member is generally used for the diffusion cover 13. The shape, size, and the like of the housing 12 and the diffusion cover 13 are not particularly limited, and for example, the dome-shaped diffusion cover 13 may be attached to the disk-shaped housing 12.

The luminaire 10 is a ceiling light and is attached to a hook ceiling which is a wiring fixture installed on the ceiling. A recess or opening (not shown) into which the hook sealing is inserted is generally formed in the central portion of the bottom surface portion 12A of the housing 12. Further, a connector, a lighting device, a remote control receiving unit, and the like may be provided in the central portion of the bottom surface portion 12A. The lighting device includes, for example, a power supply circuit that generates electric power to be supplied to the light source 11, and a control circuit that controls the electric power to be supplied to the light source 11 based on an operation signal of a remote controller or the like.

The light source 11 is installed on the bottom surface portion 12A so that light is emitted in the direction of the opening of the housing 12 to which the diffusion cover 13 is attached and the optical axis direction is parallel to the axial direction of the housing 12. The light source 11 may be a fluorescent lamp, but is preferably an LED. The LED is, for example, an SMD (Surface Mount Device) type LED, and is mounted on a circuit board. The optical axis direction of the light source 11 is defined as the normal direction of the circuit board.

The number of light sources 11 may be one, but preferably a plurality of light sources 11 are provided. In the example shown in FIG. 1, a plurality of light sources 11 are arranged in a row at equal intervals on the same circumference centered on the center X of the annular light guide plate 20. Further, although the two light sources 11 are arranged in the radial direction of the light guide plate 20 with the center X of the light guide plate 20 interposed therebetween, each light source 11 may be arranged so as not to be arranged in the radial direction of the light guide plate 20.

The light source 11 is arranged, for example, closer to the side surface portion 12B away from the center of the bottom surface portion 12A of the housing 12 (center X of the light guide plate 20). That is, the plurality of light sources 11 are arranged on the outer peripheral side of the light guide plate 20. From the viewpoint of heat dissipation and the like, the plurality of light sources 11 are arranged at predetermined intervals from each other, but when the plurality of light sources 11 are arranged on one circumference, the outer peripheral side of the light guide plate 20 is more than the inner peripheral side. More light sources 11 can be installed and the amount of light of the luminaire 10 can be increased by arranging them in.

The number and arrangement of the light sources 11 are not particularly limited. For example, a plurality of light sources 11 may be arranged on concentric circles, and a plurality of rows of light sources 11 may be provided along the circumferential direction of the light guide plate 20. Further, the optical axis direction of the light source 11 does not have to be parallel to the axial direction of the housing 12, and for example, the light source 11 may be arranged so that the optical axis direction faces the inside of the housing 12.

In the example shown in FIG. 1, the recess 25 for accommodating the light source 11 is formed along the circumferential direction of the light guide plate 20. The recess 25 is formed in an annular shape along the circumferential direction of the light guide plate 20 in the vicinity of the second end surface 24. Further, on the second end surface 24 side of the light guide plate 20 with respect to the light source 11, a reflection surface 29 extending in a direction substantially orthogonal to the radial direction of the light guide plate 20 is formed. The reflecting surface 29 is formed in an annular shape along the circumferential direction of the light guide plate 20, similarly to the recess 25. Further, the reflecting surface 29 is formed substantially parallel to the recess 25.

As illustrated in FIG. 3, the luminaire 10 may have a rectangular shape in a plan view. In the example shown in FIG. 3, the light guide plate 20 having a rectangular shape in a plan view is fixed to the housing 12 having a rectangular shape in a plan view. A connector, a lighting device, and the like are provided at the central portion of the housing 12 in the longitudinal direction. For this reason, two light guide plates 20 are arranged on both sides of the housing 12 so as to avoid the central portion in the longitudinal direction. The two light guide plates 20 have the same shape and size as each other, and are arranged symmetrically with respect to the center in the longitudinal direction of the housing 12. Further, each light guide plate 20 is arranged so that its longitudinal direction is along the lateral direction of the housing 12 and its lateral direction is along the longitudinal direction of the housing 12.

In the example shown in FIG. 3, a plurality of light sources 11 are arranged at equal intervals along the lateral direction of the housing 12. Rows formed by arranging a plurality of light sources 11 in a straight line are provided near both ends in the longitudinal direction of the housing 12. Each row of the light source 11 is housed in a recess 25 of each light guide plate 20. Further, although the two light sources 11 are arranged in the longitudinal direction of the housing 12, the light sources 11 may be arranged so as not to be arranged in the longitudinal direction of the housing 12.

In the example shown in FIG. 3, the recess 25 accommodating the light source 11 is formed linearly over the entire length of the light guide plate 20 in the longitudinal direction. Further, the second end surface 24 side of the light guide plate 20 extends in a direction substantially orthogonal to the short direction (the direction in which the two light guide plates 20 are lined up), which is the light guide direction of the light guide plate 20. The reflective surface 29 is formed. The reflecting surface 29 is formed linearly over the entire length of the light guide plate 20 in the longitudinal direction, substantially parallel to the recess 25. The cross-sectional shape of the form illustrated in FIG. 3 along the light guide direction is the same as the cross-sectional shape of the form illustrated in FIG. 1 along the light guide direction (see FIG. 2).

The plan-view shape of the luminaire 10 (housing 12 and light guide plate 20) is not limited to the perfect circular shape illustrated in FIG. 1 and the rectangular shape illustrated in FIG. 3, for example, an elliptical shape, a polygonal shape other than a quadrangle, and the like. It may be.

Hereinafter, the configuration of the light guide plate 20 will be described in detail with reference to FIGS. 4 to 6. 4 to 6 are cross-sectional views of the light guide plate 20 along the light guide direction.

As illustrated in FIG. 4, the second main surface 22 of the light guide plate 20 is formed with a recess 25 for accommodating the light source 11 and a plurality of prisms 26. As described above, the second main surface 22 is the main surface opposite to the first main surface 21, and the first main surface 21 is the light emitting surface of the light guide plate 20 to which the light of the light source 11 mainly emits. .. For example, out of the light of the light source 11, more than 50% of the light or more than 80% of the light is emitted from the first main surface 21. The light guide plate 20 is made of a highly transparent resin such as polycarbonate or acrylic resin.

A reflective sheet 14 is interposed between the second main surface 22 of the light guide plate 20 and the bottom surface 12A of the housing 12, and the light leaked from the second main surface 22 is returned to the light guide plate 20 by the reflective sheet 14. Is done. The reflective sheet 14 is a sheet having a higher reflectance to the light of the light source 11 than the housing 12. Examples of the reflective sheet 14 include a metal sheet containing aluminum as a main component, a resin sheet on which a metal vapor deposition film such as silver or aluminum is formed, and the like.

The recess 25 is a recess larger than the prism 26 and is formed in a size capable of accommodating the light source 11. The recess 25 is formed in a substantially triangular cross-sectional view by, for example, a pair of slopes 25A intersecting each other. In the present embodiment, the groove-shaped recess 25 is formed along the direction in which the plurality of light sources 11 are lined up. The apex of the triangle of the recess 25 is preferably located at a position overlapping the light source 11 in the thickness direction of the light guide plate 20. In this case, the amount of light traveling straight in the optical axis direction of the light source 11 can be reduced, and the light utilization efficiency is improved.

In the example shown in FIG. 4, the pair of slopes 25A are bent in the middle, and the inclination angle of the light guide plate 20 with respect to the thickness direction is larger on the second main surface 22 side than on the first main surface 21 side. In the manufacturing process of the luminaire 10, for example, after attaching the light source 11 to the bottom surface 12A of the housing 12, the light guide plate 20 is arranged so that the light source 11 fits in the recess 25. Therefore, by increasing the inclination angle of the slope 25A on the second main surface 22 side and widening the inlet of the recess 25, the light source plate 20 comes into contact with the light source 11 at the time of assembly even if the arrangement of the light source 11 is slightly different. It is possible to prevent the light source 11 from being damaged.

The prism 26 is a fine unevenness that diffusely reflects the light of the light source 11, and is formed over a wide range of the second main surface 22. The light emitted from the light source 11 is totally reflected by the first main surface 21, the reflecting surface 29, etc., and propagates in the light guide direction along the first main surface 21, but a part of the light is reflected by the prism 26. As a result, the light is incident on the first main surface 21 at an incident angle larger than the critical angle of total reflection, and is emitted from the first main surface 21. The prism 26 is formed so that substantially the entire area of the first main surface 21 emits light. The shape, arrangement, and the like of the prism 26 are not particularly limited, and conventionally known configurations can be applied.

As described above, the light guide plate 20 includes end faces (first end face 23 and second end face 24) that intersect the main surface. In the embodiment illustrated in FIG. 1, the first end surface 23 is formed on the inner peripheral edge of the light guide plate 20 (the peripheral edge of the through hole 27), and the second end surface 24 is formed on the outer peripheral edge of the light guide plate 20. In the embodiment illustrated in FIG. 3, the first end surface 23 is formed at one end in the lateral direction of the light guide plate 20, and the second end surface 24 is formed at the other end in the lateral direction. Further, each end face is formed along the direction in which the plurality of light sources 11 are lined up.

The first end surface 23 and the second end surface 24 may be orthogonal to each main surface, but are preferably inclined with respect to each main surface. In particular, it is preferable that the second end surface 24 is inclined so as to face the second main surface 22 side. That is, at the end of the light guide plate 20 on the second end surface 24 side, the first main surface 21 projects outside the light guide plate 20 from the second main surface 22, and the angle formed by the second end surface 24 and the first main surface 21. Is an acute angle, and the angle formed by the second end surface 24 and the second main surface 22 is an obtuse angle. In this case, the light incident on the second end surface 24 is easily reflected toward the first main surface 21, the light absorbed by the housing 12 and the like is reduced, and the light utilization efficiency is improved.

On the other hand, the first end surface 23 is preferably inclined so as to face the first main surface 21 side. That is, at the end of the light guide plate 20 on the first end surface 23 side, the second main surface 22 projects outside the light guide plate 20 from the first main surface 21, and the angle formed by the first end surface 23 and the first main surface 21. Is an obtuse angle, and the angle formed by the first end surface 23 and the second main surface 22 is an acute angle. In this case, since it is easy to emit light toward the center of the luminaire 10, it is possible to suppress a decrease in the brightness near the center of the luminaire 10 in which the light guide plate 20 does not exist. The first end surface 23 and the second end surface 24 may be substantially parallel to each other.

As described above, the light guide plate 20 extends from the first main surface 21 in a direction intersecting the light guide direction at least on the second end surface 24 side of the light source 11, and directs the light of the light source 11 toward the first end surface 23. It has a reflecting surface 29 that reflects light. In the embodiment illustrated in FIG. 4, the first main surface 21 has a step 30 forming the high region 21A and the low region 21B, and the reflecting surface connects the high region 21A and the low region 21B of the first main surface 21. 29 is formed. In this case, the thickness of the light guide plate 20 is thinner in the portion corresponding to the lower region 21B than in the portion corresponding to the higher region 21A. The area of the high region 21A is larger than the area of the low region 21B.

In the luminaire 10, since the light source 11 is arranged closer to the second end surface 24, when the light emitted from the light source 11 propagates equally in the direction of each end surface, the entire first main surface 21 is uniformly emitted without uneven brightness. However, this problem can be solved by providing the reflecting surface 29. By reflecting the light of the light source 11 to the first end surface 23 side, that is, the high region 21A side having a large area by the reflecting surface 29, the amount of light guided to the high region 21A side is increased, and the high region 21A and the low region 21B have the same brightness. It is possible to make it emit light with.

The reflecting surface 29 is, for example, a plane substantially orthogonal to the light guide direction of the light guide plate 20. The reflective surface 29 illustrated in FIG. 4 is a plane along a direction substantially orthogonal to the first main surface 21, a thickness direction of the light guide plate 20, and an optical axis direction of the light source 11. Similar to the first main surface 21, the reflecting surface 29 totally reflects the light of the light source 11. Therefore, the first main surface 21 and the reflecting surface 29 are preferably smooth surfaces without unevenness. Both the high region 21A and the low region 21B of the first main surface 21 formed by the step 30 are planes substantially parallel to the second main surface 22.

The reflecting surface 29 is preferably formed in the vicinity of the light source 11 between the light source 11 and the second end surface 24. That is, the distance between the reflecting surface 29 and the light source 11 is shorter than the distance between the reflecting surface 29 and the second end surface 24. In the example shown in FIG. 4, the reflecting surface 29 is formed only on the second end surface 24 side of the light source 11. Further, the reflecting surface 29 is formed along the recess 25 in a range that overlaps with the recess 25 in the thickness direction of the light guide plate 20 and does not overlap with the light source 11 housed in the recess 25.

The height of the reflecting surface 29 (the length along the thickness direction of the light guide plate 20) is the area (A1) of the first main surface 21 located on the first end surface 23 side of the light source 11 and the height of the light source 11. It may be determined based on the ratio of the area (A2) of the first main surface 21 located on the two end surface 24 side. For example, the larger A1 / A2, the higher the reflecting surface 29, and the larger the amount of light distributed to the first end surface 23 side. According to the light guide plate 20, it is possible to easily adjust the distribution ratio of light in the direction of each end surface by a simple means of changing the height of the reflecting surface 29.

In the embodiment illustrated in FIG. 4, the height of the reflecting surface 29 depends on the height of the step 30. The height of the reflecting surface 29 (step 30) is not particularly limited, but as an example, it is 20% to 80%, or 30% to 70%, or 40% to 60% of the thickness of the thickest portion of the light guide plate 20. is there. The reflecting surface 29 may be formed at a height exceeding the position corresponding to the apex (innermost portion) of the recess 25 from the high region 21A of the first main surface 21. The thickness of the portion corresponding to the lower region 21B is, for example, 40% to 60% of the thickness of the portion corresponding to the higher region 21A.

It is preferable that the first main surface 21 is provided with a reflective member 28 that covers a region overlapping the light source 11 in the thickness direction of the light guide plate 20. The reflecting member 28 can reflect light having a large incident angle along the optical axis direction, and can suppress the brightness of the region overlapping the light source 11. The reflective member 28 may be attached to the first main surface 21 using an adhesive. A member having a high reflectance to the light of the light source 11 can be applied to the reflective member 28. For example, like the reflective sheet 14, a metal sheet containing aluminum or the like as a main component and a metal vapor deposition film such as silver or aluminum are formed. A resin sheet is used. The reflecting member 28 may transmit a part of the light of the light source 11.

The reflective member 28 is preferably provided over at least a part of the reflective surface 29. In the example shown in FIG. 4, the reflective member 28 covers the entire area of the reflective surface 29. The reflective member 28 is provided from the high region 21A of the first main surface 21 to the boundary between the reflective member 28 and the low region 21B. By covering the reflecting surface 29 with the reflecting member 28, the light leaking from the reflecting surface 29 can be returned to the inside of the light guide plate 20. The reflective member 28 may be provided in a part of the lower region 21B.

As illustrated in FIG. 5, the reflecting surface 29 is not limited to a flat surface, and may be a curved surface curved toward the outside of the light guide plate 20. The reflecting surface 29 may be entirely curved, and may be partially flat and the rest curved. In the example shown in FIG. 5, the region on the lower region 21B side of the reflecting surface 29 is a plane substantially orthogonal to the light guide direction, and the region on the higher region 21A side is a curved surface curved so as to be convex outward. .. According to the reflecting surface 29 including the curved surface, the amount of light reflected in the direction of the first end surface 23 can be increased as compared with the reflecting surface 29 composed of only a flat surface.

The reflective surface 29 illustrated in FIG. 5 is a region located on the first end surface 23 side of the light source 11 from the second end surface 24 side of the light source 11 beyond the region overlapping the light source 11 in the thickness direction of the light guide plate 20. Is formed over. Also in this case, the first main surface 21 has a step 30 forming the high region 21A and the low region 21B, and the reflecting surface 29 is formed so as to connect the high region 21A and the low region 21B. The reflective member 28 covers at least a region of the reflective surface 29 that overlaps the light source 11, and preferably covers a wide area of the reflective surface 29. The reflecting member 28 may be provided over the entire area of the reflecting surface 29.

As illustrated in FIG. 6, a slit-shaped groove 31 cut from the first main surface 21 is formed on the second end surface 24 side of the light guide plate 20 with respect to the light source 11 instead of the step 30. May be good. In this case, the side surface of the groove 31 becomes the reflecting surface 29. Further, the thickness of the light guide plate 20 is constant except for the portion where the groove 31 is formed. The groove 31 is formed, for example, along the thickness direction of the light guide plate 20, and a reflecting surface 29 substantially orthogonal to the light guide direction is formed.

The groove 31 and the reflecting surface 29 are formed along the recess 25 in a range that overlaps with the recess 25 in the thickness direction of the light guide plate 20 and does not overlap with the light source 11 housed in the recess 25. The width of the groove 31 is not particularly limited and may be 5 mm or less, or 1 mm or less. According to the embodiment illustrated in FIG. 6, the light transmitted without being reflected by the reflecting surface 29 can be propagated to the second end surface 24 side and effectively utilized. As illustrated in FIGS. 5 and 6, the slope 25A forming the recess 25 may be inclined at a constant angle with respect to the thickness direction of the light guide plate 20.

As described above, according to the luminaire 10 having the above configuration, the light of the light source 11 can be efficiently distributed in the direction of the first end surface 23 by the reflecting surface 29. As described above, since the light source 11 is arranged closer to the second end face 24, when the light of the light source 11 propagates equally in the direction of each end face, the brightness of the second end face 24 side becomes higher than that of the first end face 23 side. However, in the lighting fixture 10, it is possible to suppress such brightness unevenness by the function of the reflecting surface 29 and uniformly surface-emit the entire first main surface 21. That is, according to the luminaire 10, in the conventional structure, a part of the light distributed in the direction of the second end surface 24 can be distributed in the direction of the first end surface 23, and the light guide ratio in each direction is easy. It is possible to optimize for.

10 Lighting equipment, 11 Light source, 12 Housing, 12A Bottom part, 12B Side part, 13 Diffusion cover, 14 Reflective sheet, 20 Light guide plate, 21 1st main surface, 21A High area, 21B Low area, 22 2nd main surface , 23 1st end face, 24 2nd end face, 25 recess, 25A slope, 26 prism, 27 through hole, 28 reflective member, 29 reflective surface, 30 step, 31 groove, center of X light guide plate

Claims (8)

The first main surface from which light is mainly emitted, the second main surface opposite to the first main surface, the first end surface intersecting the first main surface and the second main surface, and the opposite to the first end surface. A plate-shaped member including a second end surface on the side, and a light guide plate having a recess formed on the second main surface.
The light source housed in the recess and
With
The recess is formed closer to the second end face away from the first end face.
The light guide plate extends from the first main surface in a direction intersecting the light guide direction at least on the second end surface side of the light source, and reflects the light of the light source in the direction of the first end surface. A luminaire with a face. The luminaire according to claim 1, wherein at least one of the first main surface and the reflective surface is provided with a reflective member in a region overlapping the light source in the thickness direction of the light guide plate. The lighting fixture according to claim 2, wherein the reflective member is provided on at least a part of the reflective surface. On the first main surface, there is a step forming a high region and a low region.
The luminaire according to any one of claims 1 to 3, wherein the reflecting surface is formed so as to connect the high region and the low region of the first main surface. The lighting fixture according to any one of claims 1 to 4, wherein the reflecting surface is a curved surface that curves toward the outside of the light guide plate. The lighting fixture according to any one of claims 1 to 4, wherein the reflecting surface is a plane substantially orthogonal to the light guide direction of the light guide plate. The lighting fixture according to any one of claims 1 to 6, wherein the second end surface is inclined so as to face the second main surface side. The recess is formed by a pair of slopes that intersect each other.
The illumination according to any one of claims 1 to 7, wherein the pair of slopes has a larger inclination angle with respect to the thickness direction of the light guide plate on the second main surface side than on the first main surface side. Equipment.

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