JP7462463B2 - lighting equipment - Google Patents

Description

This disclosure relates to a lighting fixture that is attached to a mounting portion such as a ceiling.

Conventionally, in lighting fixtures, the housing is embedded in the installation surface such as the ceiling, and light from a light source disposed within the housing is emitted directly downward from an opening in the housing. The light source disposed within the housing is disposed on a light-emitting substrate. The lighting fixture has a diffusion panel disposed in front of the light-emitting substrate at an angle to the light-emitting substrate. Light from the light source enters the diffusion panel, is diffused, and is emitted from the lighting fixture (see, for example, Patent Document 1).

JP 2017-62932 A

However, in the lighting fixture disclosed in Patent Document 1, a plate-shaped resin panel is disposed at an angle to the light-emitting substrate, and the distance from the light source differs between one end of the diffusion panel and the other end. The diffusion panel diffuses light that enters from the light source, but because the distance from the light source to each part of the diffusion panel is not uniform, there is an issue of uneven light emission.

This disclosure has been made to solve the problems described above, and aims to provide a lighting fixture that suppresses uneven light emission from the diffusion panel.

The lighting device according to the present disclosure includes a light-emitting substrate on which a light-emitting element that emits light in a first direction is disposed, a plate-shaped diffusion panel that is located in the first direction of the light-emitting substrate and diffuses the light from the light-emitting element, and a structural member that supports the light-emitting substrate and the diffusion panel, the diffusion panel including an entrance surface that is one surface of the diffusion panel and faces the light-emitting substrate, and an exit surface that is the other surface of the diffusion panel, the entrance surface being disposed at an angle with respect to the first direction, and the structural member including a first substrate mounting portion to which the light-emitting substrate is fixed, and a first substrate mounting portion that is disposed on the first substrate mounting portion. a main body reflecting portion extending in the first direction from an end of the light emitting element and facing the incident surface, the main body reflecting portion reflects the light from the light emitting element , a portion of the main body reflecting portion protruding toward the incident surface side to form a first reflecting portion and a second reflecting portion, the first reflecting portion and the second reflecting portion being formed by curved surfaces, the first reflecting portion being located closer to the light emitting substrate in the first direction than the second reflecting portion and being a concave curved surface when viewed from the incident surface side, and the second reflecting portion being formed continuously from the first reflecting portion and being a curved surface having an arc-shaped cross-sectional shape and convex toward the incident surface side .

The lighting device disclosed herein reduces unevenness in light emission when it receives light from a light source on a light-emitting substrate and emits light.

1 is a perspective view of a lighting fixture 1 according to a first embodiment. FIG. 2 is a perspective view showing a mounting portion 900 formed by a T-bar 901 installed on a ceiling to which the lighting fixture 1 shown in FIG. 1 is attached. FIG. 2 is an exploded perspective view of the lighting device 1 shown in FIG. 1 . FIG. 2 is a bottom view of the lighting device 1 shown in FIG. 1 . FIG. 5 is an explanatory diagram of a cross-sectional structure of the AA portion of FIG. 4. 2 is a perspective view of a first light source assembly 200A that constitutes a light source section 200 of the lighting device 1 according to the first embodiment. FIG. 2 is an explanatory diagram of a cross-sectional structure of a first light source assembly 200A that constitutes a light source section 200 of the lighting device 1 in accordance with embodiment 1. FIG. 2 is an exploded perspective view of a first light source assembly 200A that constitutes a light source section 200 of the lighting device 1 according to the first embodiment. FIG. 2 is an explanatory diagram of a cross-sectional structure of a disassembled first light source assembly 200A that constitutes a light source unit 200 of the lighting device 1 in accordance with the first embodiment. FIG. 2 is a perspective view of the periphery of a corner of a light source unit 200 of the lighting device 1 according to the first embodiment. FIG. 6 is an enlarged view of the periphery of the first light-emitting substrate 220 and the diffusion panel 300 of FIG. 5 . 1 is an enlarged view of the periphery of a first light-emitting substrate 220 and a diffusion panel 300 of a lighting fixture 1001 which is a comparative example of the lighting fixture 1 according to the first embodiment. FIG. 11 is a perspective view of the stopper 270 shown in FIG. 10 as viewed from above. FIG. 11 is a bottom perspective view of the stopper 270 shown in FIG. 10. FIG. 10 is a perspective view showing a process of attaching the light guide panel 410 to the light source unit 200 in the lighting device 1 according to the first embodiment. FIG. 10 is a perspective view showing a process of attaching the light guide panel 410 to the light source unit 200 in the lighting device 1 according to the first embodiment. FIG. 10 is a perspective view showing a process of attaching the light guide panel 410 to the light source unit 200 in the lighting device 1 according to the first embodiment. FIG. 10 is a perspective view showing a process of attaching the light guide panel 410 to the light source unit 200 in the lighting device 1 according to the first embodiment. FIG. 10 is a perspective view showing a process of attaching the light guide panel 410 to the light source unit 200 in the lighting device 1 according to the first embodiment. FIG. 1 is a perspective view of a lighting device 1 according to a first embodiment, seen from above. 6 is a perspective view showing a state in which a cover portion 600 is removed from the lighting device 1 according to the first embodiment. FIG. FIG. 22 is a perspective view of the power supply frame 510 of FIG. 21 . 22 is a perspective view of the terminal base unit 700 shown in FIG. 21 as viewed from above. FIG. 22 is a perspective view of the terminal base unit 700 shown in FIG. 21 as viewed from below. FIG. 22 is an exploded perspective view of the terminal base unit 700 shown in FIG. 21 as viewed from above. 22 is an exploded perspective view of the terminal base unit 700 shown in FIG. 21 as viewed from below. FIG. 1 is a perspective view of a lighting fixture 1001 which is a modified example of the lighting fixture 1 according to the first embodiment. FIG. 28 is an exploded perspective view of the lighting device 1001 of FIG. 27. FIG. 28 is an exploded perspective view of the lighting device 1001 of FIG. 27. FIG. 28 is an exploded perspective view of the lighting device 1001 of FIG. 27. FIG. 28 is an explanatory diagram of a cross-sectional structure of the lighting fixture 1001 of FIG. 27.

The following describes an embodiment of the lighting fixture according to the present disclosure with reference to the drawings. The present disclosure is not limited to the following embodiment, and various modifications can be made without departing from the spirit of the present disclosure. The present disclosure includes all combinations of the configurations shown in the following embodiments that can be combined. In addition, in each drawing, the same reference numerals are attached to the same or equivalent parts, and this is common throughout the entire specification. In addition, throughout the entire specification, the direction from the floor to the ceiling is referred to as the "upward direction," and the ceiling side is referred to as the "upper side." Similarly, the vertical direction from the ceiling to the floor is referred to as the "downward direction," and the floor side is referred to as the "lower side." In addition, in each component, the opening side provided in the center of the lighting fixture 1 is referred to as the "inner side," and the outside side of the frame of the lighting fixture 1 is referred to as the "outer side." In each drawing, mutually orthogonal X, Y, and Z directions are defined, and the lighting fixture is basically described in a state in which the Z direction is set in the vertical direction, but is not necessarily limited to the vertical direction only, and may be arranged with the Z direction tilted from the vertical direction, for example. In addition, the relative dimensions or shapes of each component in each drawing may differ from the actual ones.

Embodiment 1.
FIG. 1 is a perspective view of a lighting fixture 1 according to the first embodiment. FIG. 2 is a perspective view showing a mounting portion 900 constituted by a T-bar 901 installed on a ceiling to which the lighting fixture 1 shown in FIG. 1 is attached. FIG. 3 is an exploded perspective view of the lighting fixture 1 shown in FIG. 1. The present disclosure relates to a lighting fixture that is attached to a ceiling. First, the configuration of the lighting fixture 1 will be described with reference to FIGS. 1 to 3. The lighting fixture 1 includes a frame portion 100 that is attached to the mounting portion 900. A light source portion 200 is attached to the frame portion 100, and a diffusion panel portion 300 is held between the frame portion 100 and the light source portion 200. The lighting fixture 1 also includes a light guide portion 400 that is placed on the light source portion 200, a power supply portion 500 that controls the lighting of the light source portion 200, a cover portion 600 that is attached to cover the light source portion 200 and the power supply portion 500, and a terminal block unit 700 into which an external power line or the like is inserted.

Figure 4 is a bottom view of the lighting fixture 1 shown in Figure 1. Figure 5 is an explanatory diagram of the cross-sectional structure of part A-A in Figure 4. The frame part 100 is formed in a rectangular frame shape and has four frame side parts 110 forming a square shape. Each of the frame side parts 110 is formed by aluminum extrusion processing and has an L-shaped cross section. The frame part 100 is attached to the mounting part 900, and has a mounting bracket 120 on the frame side part 110 that constitutes the side of the frame part 100. The mounting bracket 120 is formed by bending a metal plate into a crank shape in the cross section shown in Figure 5. The mounting bracket 120 has a claw part 121 that extends in the Z2 direction at a position protruding laterally from the frame side part 110. In addition, the end of the mounting bracket 120 in the Z1 direction is a fixing part 123, which is fixed to the frame side part 110 by using a screw 902. The fixing portion 123 and the claw portion 121 are connected by a connecting portion 122 extending in the Y direction. The connecting portion 122 abuts against the upper end of the T-bar 901 of the mounting portion 900. The lighting device 1 is fixed to the mounting portion 900 by the connecting portion 122 being hooked onto the T-bar 901.

The mounting brackets 120 are arranged on one of two sets of opposing side surfaces of the four frame side parts 110. The mounting brackets 120 provided on one frame side part 110 are arranged horizontally offset from the mounting brackets 120 arranged on the opposing frame side part 110. In the first embodiment, as shown in FIG. 3, the mounting brackets 120 attached to the two opposing frame side parts 110 are arranged offset in the X direction so as to be staggered. By arranging the mounting brackets 120 in this manner, it is possible to prevent the mounting brackets 120 from interfering with each other even if multiple lighting fixtures 1 are arranged adjacent to each other. In the first embodiment, four mounting brackets 120 are attached to the lighting fixture 1, but the number is not limited to this. For example, the horizontal width dimension of the mounting brackets 120 may be changed to arrange two mounting brackets 120 on one frame side part 110 and one mounting bracket 120 on the other opposing frame side part 110. In this case, one mounting bracket 120 of one frame side portion 110 is positioned between two mounting brackets 120 of the other frame side portion 110, and it is preferable to set the width dimension of the mounting bracket 120 to be large.

The frame side section 110 has a first mounting section 111 on which the light source section 200 is placed, and a second mounting section 112 on which the diffusion panel section 300 is placed. The first mounting section 111 is formed to be thick so that the light source section 200 can be fixed with a fixing part such as a screw 902. In other words, the first mounting section 111 is formed with a large width in a direction perpendicular to the Z direction (Y direction or X direction) so that the screw can be fastened. In addition, the inner surface N of the first mounting section 111 is formed so as to be in surface contact with the outer surface M of the light source section 200, and the displacement of the light source section 200 falling inward or the displacement in the horizontal direction XY due to the weight of the light guide section 400 can be suppressed.

A second mounting portion 112 is provided at the lower end of the frame side portion 110. The second mounting portion 112 is formed with a mounting recess 112a that accommodates the first gasket 320 of the diffusion panel portion 300. The diffusion panel portion 300 is mounted on the second mounting portion 112 via the first gasket 320.

When the light source unit 200 is attached to the frame unit 100, heat from the light source unit 200 is transferred from the first mounting unit 111 and dissipated to the outside. Also, as shown in FIG. 5, a frame control unit 112b is formed at a portion of the frame unit 100 on the lower Z2 side of the light source unit 200. This frame control unit 112b is configured so that the members are doubled, and the reflective surface 112c, which is the surface located on the inside, reflects light inward in the Y direction and suppresses light that goes behind the light source, that is, to the outside of the lighting device 1. The reflective surface 112c is located between one end of the diffusion panel 310 and the first light-emitting substrate 220 in the Z direction. Also, it is preferable that the reflective surface 112c is arranged on the first light-emitting substrate 220 side so as not to leak light to the outside of the lighting device 1. Also, as shown in FIG. 3, the frame unit 100 is configured by butting the end faces of the four frame side parts 110 together and arranging them in a square shape. The frame side parts 110 butt their end faces, which form an angle of 45° with respect to the longitudinal direction when viewed from the Z1 side, to form corners of the frame part 100. Because the frame side parts 110 are configured with a double member at the lower end, when the frame side parts 110 are arranged in a square shape, it is possible to further prevent light from leaking outward from the gap where the ends of the frame side parts 110 butt against each other.

Figure 6 is a perspective view of the first light source assembly 200A constituting the light source unit 200 of the lighting fixture 1 according to embodiment 1. Figure 7 is an explanatory diagram of the cross-sectional structure of the first light source assembly 200A constituting the light source unit 200 of the lighting fixture 1 according to embodiment 1. Figure 8 is an exploded perspective view of the first light source assembly 200A constituting the light source unit 200 of the lighting fixture 1 according to embodiment 1. Figure 9 is an explanatory diagram of the cross-sectional structure of the first light source assembly 200A constituting the light source unit 200 of the lighting fixture 1 according to embodiment 1 in an exploded state. Figure 10 is a perspective view of the periphery of a corner of the light source unit 200 of the lighting fixture 1 according to embodiment 1. The first light source assembly 200A constituting the light source unit 200 has a first light source main body part 210A, a first light emitting board 220, a second light emitting board 230, a clip 250, and a lower reflecting part 260. As shown in FIG. 3, the light source unit 200 includes a second light source unit 200B to which the second light-emitting substrate 230 of the first light source unit 200A is not attached. The light source unit 200 is formed by combining the first light source unit 200A and the second light source unit 200B.

As shown in FIG. 10, the light source unit 200 has a first light source body 210A to which the second light emitting substrate 230 is attached, and a second light source body 210B to which the second light emitting substrate 230 is not attached. The first light source body 210A and the second light source body 210B are combined with their ends butted together so that their longitudinal directions are perpendicular to each other, and are connected by an L-shaped metal fitting 210a. The first light source body 210A and the second light source body 210B are combined in pairs in a rectangular shape to form the light source unit 200. The light source unit 200 is formed in a square shape by arranging the first light source body 210A and the second light source body 210B so that they face each other. As shown in FIG. 3, the second light emitting substrate 230 is attached to the upper part of the two opposing first light source body parts 210A. The first light source body 210A and the second light source body 210B may be collectively referred to as the light source body 210.

As shown in Figures 3 and 5, the light source body 210 supports the first light emitting substrate 220, the second light emitting substrate 230, and the light guide section 400. The light source body 210 is formed by combining four members in a square shape to form a rectangular opening 209 from which the light guide panel 410 is exposed on the inside. Each of the four light source body sections 210 that constitute the main structure of the light source section 200 is formed from an extruded aluminum material.

The first light source body 210A holds the first light emitting board 220, the second light emitting board 230, and the light guide 400. The first light source body 210A has a light guide plate mounting section 211, a first groove section 212, a first board mounting section 213, a fixing section 215, a component mounting section 216, a body reflecting section 217, and a second board mounting section 218. The second light source body 210B is not equipped with the second light emitting board 230, and does not have the second board mounting section 218 of the first light source body 210A. The first light emitting board 220 and the second light emitting board 230 may be simply referred to as light emitting boards.

7 and 9, the light source body 210 has a light guide plate mounting portion 211, a first groove portion 212, a first substrate mounting portion 213, and a fixing portion 215. In the cross-sectional structure, the light guide plate mounting portion 211 is a plate-like portion extending horizontally and located in the inner portion of the light source portion 200. The light guide plate mounting portion 211 has a pressing side recess 211a formed on the surface on the upper direction Z1 side of the inner end portion of the light source portion 200 in which the second packing 330 is housed. The second packing 330 abuts against the upper end of the diffusion panel portion 300 and also serves as a cushioning material between the light guide panel 410 and the light source body 210 and the diffusion panel portion 300.

A step portion 211b is formed adjacent to the outer side of the surface 211c on the upward Z1 side of the light guide plate mounting portion 211. The step portion 211b is recessed so that the lower reflector 260 can be accommodated therein. The light guide plate mounting portion 211 is formed so that the surface 211c on the upward Z1 side and the upper surface of the lower reflector 260 accommodated in the step portion 211b are flat. In other words, the depth dimension of the step portion 211b is formed to be approximately the same as the thickness dimension of the lower reflector 260.

The first groove 212 is formed on the outside of the light guide plate mounting portion 211 and is recessed in the Z2 direction from the surface 211c and the step portion 211b. The second light emitting substrate 230 is combined with the second substrate mounting portion 218 of the light source body portion 210 using a clip 250. One end edge 230a along the longitudinal direction of the second light emitting substrate 230 is inserted into the first groove 212. In other words, the first groove 212 holds the position of the inserted first light emitting substrate 220 in the Z direction and the XY direction. The first groove 212 is recessed downward from the light guide plate mounting portion 211 in the Z2 direction. The first groove 212 is formed so that the Z1 side is wider than the Z2 side. The first groove 212 into which the first light emitting substrate 220 is inserted may be simply called a groove.

The second board mounting portion 218 constitutes the outer wall of the first groove portion 212 and protrudes along the Z1 direction. The second light emitting board 230 abuts against the abutment surface 218a of the second board mounting portion 218, which is the surface on the first groove portion 212 side. A second claw portion 218b is formed at the Z1 side end of the second board mounting portion 218, and the Z1 side end of the second light emitting board 230 is hooked onto it. A main body opening 218aa is formed on the abutment surface 218a on the first groove portion 212 side of the second board mounting portion 218, into which the inner protrusion 251 of the clip 250 fits. The second light emitting board 230 has an opening 235 formed to correspond to the main body opening 218aa.

The second board mounting portion 218 of the light source body 210 has an abutment surface 218a that is arranged so that the back surface of the second light emitting board 230 abuts against it, and a part mounting portion 216 that protrudes from the back side of the abutment surface 218a and is connected to the fixing portion 215. The part mounting portion 216 is formed between the fixing portion 215 and the second board mounting portion 218. The first reflecting portion 217a of the main body reflecting portion 217 is formed below the part mounting portion 216, forming the Z2 side surface of the light source body 210. The main body reflecting portion 217 is a portion that continues from the surface facing the Z2 side formed by the bottom of the first groove portion 212, and the first reflecting portion 217a and the second reflecting portion 217b, which are parts of the main body reflecting portion 217, are located at a position that protrudes downward from the light guide plate mounting portion 211. The part mounting portion 216 and the main body reflecting portion 217 are formed hollow. The L-shaped metal fitting 210a is inserted into this hollow portion, and the L-shaped metal fitting 210a is fixed to the first light source body part 210A and the second light source body part 210B from the upward direction Z1 side by a fixing member such as a screw.

The first board mounting portion 213 is a portion to which the first light emitting board 220 is attached. The first board mounting portion 213 protrudes in the Z2 direction from between the fixing portion 215 and the component mounting portion 216 and the main body reflecting portion 217. A second groove portion 213a is formed at the upper end of the first board mounting portion 213, and a claw portion 213b is formed at the lower end. The first light emitting board 220 is arranged facing the inside of the light source unit 200. After the Z1 side edge of the first light emitting board 220 is inserted into the second groove portion 213a, the Z2 side end of the first light emitting board 220 is rotated so that the Z2 side end is hooked on the claw portion 213b and abuts against the first board mounting portion 213. The first light emitting board 220 and the first board mounting portion 213 are fixed at the Z2 side end by the clip 250. The first board mounting portion 213 has a main body opening 213aa into which the inner convex portion 251 provided on the inside of the clip 250 fits. The first light-emitting substrate 220 has an opening 225 formed at a position corresponding to the main body opening 213aa. Note that the second groove portion 213a into which a light-emitting substrate such as the first light-emitting substrate 220 is inserted may be referred to simply as a groove.

The fixing portion 215 is provided on the upper portion of the light source body 210 and is located closer to the frame 100 than the first substrate attachment portion 213. The fixing portion 215 is formed in an L-shape and is placed on the upper surface of the first mounting portion 111 of the frame 100 and fixed to the frame 100 with a fastener such as a screw 902.

As shown in FIG. 5, the first light-emitting substrate 220 is fixed to the first substrate attachment portion 213. One end of the diffusion panel 310 is supported by the second mounting portion 112 at the lower end of the frame side portion 110, and the other end is supported in contact with the light guide panel 410 via a second gasket 330 attached to the light source body portion 210. Note that the structure including the frame side portion 110 and the light source body portion 210 that support the first light-emitting substrate 220 and the diffusion panel 310 may be collectively referred to as a structural member.

The light emitting element 222 installed on the first light emitting substrate 220 emits light centered on the optical axis L1, and the light is incident on the incident surface 312 of the diffusion panel 310. The direction in which the light is emitted from the light emitting element 222 may be referred to as the first direction. The first direction is a direction along the Y direction in FIG. 5 and is parallel to the optical axis L1. The direction perpendicular to the first direction may be referred to as the second direction. The diffusion panel 310 diffuses the light from the light emitting element 222 of the first light emitting substrate 220 and emits it from the emission surface 313. As shown in FIG. 3, FIG. 6 and FIG. 8, the first light emitting substrate 220 includes a first substrate 221 formed long in the X direction or Y direction, a plurality of light emitting elements 222 mounted linearly along the longitudinal direction of the first substrate 221, and connectors 223 provided at both ends in the longitudinal direction. The first substrate 221 has an opening 225 into which the inner convex portion 251 of the clip 250 fits. In addition, in the first embodiment, the multiple light-emitting elements 222 all emit light of the same color, for example, white light.

The first light-emitting board 220 is attached to three of the first board mounting parts 213 of the four light source main body parts 210. By not attaching the first light-emitting board 220 to one of the four first board mounting parts 213, it is possible to create a shadow effect. This is because, when the light guide panel 410 of the lighting fixture 1 is assumed to simulate a blue sky and the diffusion panel 310 to simulate the surrounding wall surface or window frame, it is possible to create an effect that simulates areas illuminated with light from the blue sky and areas that are in shade.

Figure 11 is an enlarged view of the first light-emitting substrate 220 and the periphery of the diffusion panel section 300 in Figure 5. The main body reflector 217 shown in Figure 11 controls the light from the first light-emitting substrate 220 so that it can uniformly irradiate the incident surface 312 of the diffusion panel 310. The main body reflector 217 is formed over the area from the second groove section 213a to the end of the light guide plate mounting section 211. As shown in Figure 11, the main body reflector 217 has a first reflector 217a, a second reflector 217b, and a third reflector 217c in that order from the second groove section 213a side toward the light guide plate mounting section 211.

In the first embodiment, the light from the light emitting element 222 of the first light emitting substrate 220 is strong in the range of an irradiation angle of 45 degrees from the optical axis L, and becomes weaker when the irradiation angle is greater than 45 degrees. Therefore, when only direct light is considered, the area A at the bottom end of the diffusion panel 310 shown by the wavy line in FIG. 11 receives a small amount of light and is likely to become dark. The angle area where this light is stronger than a certain value is referred to as the main irradiation angle. Note that the main irradiation angle shown in FIG. 11 is an example, and the main irradiation angle may be large or small depending on the specifications of the light emitting element 222. Note that the light emitted from the light emitting element 222 of the first light emitting substrate 220 may be referred to as the first light.

In addition, as the distance from the light-emitting element 222 increases, the light attenuates and the light that reaches the diffusion panel 310 becomes weaker. Therefore, the area indicated by region B at the upper end of the diffusion panel 310, which is shown by a wavy line in Figure 11, tends to become dark.

The first reflecting portion 217a is disposed on the first light-emitting substrate 220 side. The first reflecting portion 217a is closest to the first light-emitting substrate 220 in the first direction, which is the emission direction of light from the light-emitting element 222. The first reflecting portion 217a is located on the Z2 side of the component mounting portion 216, and has a curved surface that is concave when viewed from the incident surface 312 side with an arc-shaped cross section that is convex on the Z1 side. The first reflecting portion 217a is disposed facing the first light-emitting substrate 220 side. In other words, the curved surface of the first reflecting portion 217a is inclined so as to approach the optical axis L1 as it moves away from the first light-emitting substrate 220.

The second reflecting portion 217b is a curved surface with an arc-shaped cross section that is convex on the Z2 side, which is located on the light guide plate mounting portion 211 side relative to the first reflecting portion 217a. The second reflecting portion 217b and the light guide plate mounting portion 211 are connected by a slope 219. The third reflecting portion 217c is the surface on the Z2 side of the light guide plate mounting portion 211. The third reflecting portion 217c is a flat surface.

As shown in FIG. 11, the first reflecting portion 217a has a concave shape recessed in an arc when viewed from the side of the light emitting element 222, which is the light source. Light reaching the first reflecting portion 217a from the light emitting element 222 is reflected toward an area in a wider angle direction than the main irradiation angle of the light emitting element 222. The light reflected by the first reflecting portion 217a is shown by a dashed line in FIG. 11, and heads toward area A shown by a wavy line. As a result, the light reaching area A shown by the wavy line around the bottom end of the diffusion panel 310 becomes larger, making it brighter.

The third reflecting portion 217c is provided on the Z1 side of the first reflecting portion 217a and the second reflecting portion 217b, and reflects light from the light emitting element 222 to region B, which is the upper end of the diffusion panel 310. The second reflecting portion 217b is located between the first reflecting portion 217a and the third reflecting portion 217c, and is a portion that is convex on the Z2 side. The second reflecting portion 217b is formed in a convex arc shape on the side of the light emitting element 222, which is the light source, thereby suppressing bright lines on the diffusion panel that are caused by reflection of light from the light source.

12 is an enlarged view of the first light-emitting substrate 220 and the periphery of the diffusion panel 300 of the lighting fixture 1001, which is a comparative example of the lighting fixture 1 according to the first embodiment. If the cross-sectional shape of the reflective surface 1217 is formed in a flat shape, as in the lighting fixture 1001 of the comparative example, the area where the light from the light source is reflected is limited, and the amount of light that reaches each part of the diffusion panel 310 varies. For example, as shown in FIG. 12, the area B located at the upper end of the diffusion panel 310 is bright because it receives the reflected light of the third reflection part 1217c, and the area D that receives the reflected light of the flat first reflection part 1217a formed at the bottom of the first groove part 212 is also bright. However, the area C where the light reflected by the first reflection part 1217a and the third reflection part 1217c does not reach is darker than the areas B and D. In addition, the area E that is closest to the light-emitting element 222 within the range of the main irradiation angle of the light-emitting element 222 has the highest brightness. Furthermore, the area on the Z2 side of the first mounting portion 1213 to which the first light-emitting substrate 220 is attached is the darkest because almost no light from the light-emitting element 222 reaches it. Thus, in the lighting device 1001 according to the comparative example, the light reaching each area from the top to the bottom of the diffusion panel 310 is different, and the brightness difference is large in each part, causing bright lines. On the other hand, in the lighting device 1 according to embodiment 1, the first reflecting portion 217a and the second reflecting portion 217b are curved in an arc shape, and the light from the light source is diffused, so the amount of light reaching each part of the diffusion panel 310 is uniform, and the occurrence of bright lines is suppressed.

As shown in FIG. 5, the second light-emitting substrate 230 irradiates light toward the end surface 410a of the light guide panel 410 placed on the upper surface of the first mounting portion 111 of the light source body 210. As shown in FIG. 3 and FIG. 8, the second light-emitting substrate 230 includes a second substrate 231 formed long in the X direction, a plurality of light-emitting elements 232 mounted along the longitudinal direction of the second substrate 231, and a second connector 233 provided at both longitudinal ends. The second substrate 231 has an opening 235 into which the inner convex portion 251 of the clip 250 fits. The opening 235 is formed in an elongated hole shape along the longitudinal direction of the second substrate 231, and is configured so that even if the second substrate 231 expands or contracts due to the influence of heat, the clip 250 does not restrain the second substrate 231 due to the displacement. By being configured in this way, the second light-emitting substrate 230 can be prevented from being deformed by heat caused by the light emitted by the light-emitting element 232.

In the first embodiment, the second light-emitting board 230 is provided with a plurality of light-emitting elements 232 that emit different colors, for example, a plurality of blue, white, and green light-emitting elements are provided. The second connector 233 is provided to correspond to each of the plurality of colors, and is composed of, for example, a two-wire connector 233a and a single-wire connector 233b, so that it can correspond to the light-emitting elements 232 that correspond to each of the three colors. In addition, the second light-emitting board 230 has a portion between the two-wire connector 233a and the single-wire connector 233b where the panel stopper 270 (see FIG. 10) abuts. Since the portion where the panel stopper 271c abuts is provided between the two-wire connector 233a and the single-wire connector 233b, the panel stopper 271c is prevented from blocking the light from the light-emitting element 232.

As shown in FIG. 5, the light-emitting elements 232 are provided in the center of the second substrate 231 in the vertical direction, i.e., in the Z direction. The positions of the light-emitting elements 232 are opposite the end surface 410a, which is the light-entering surface of the light-guiding panel 410, when the second light-emitting substrate 230 is inserted into the first groove portion 212.

As shown in FIG. 8, the second board attachment portion 218 of the light source body 210 has an abutment surface 218a against which the second light-emitting board 230 is arranged to abut, and a second claw portion 218b on which the end of the second light-emitting board 230 is hooked. A body opening 218aa is formed in the abutment surface 218a into which the inner protrusion 251 of the clip 250 fits.

The second light-emitting substrate 230 has a portion between the end light-emitting element 232 and the second connector 233 where a panel stopper 271c of the stopper 270 described later comes into contact (see FIG. 10). By providing the portion where the panel stopper 271c comes into contact adjacent to the end light-emitting element 232, the panel stopper 271c can be prevented from blocking the light from the light-emitting element 232. In addition, a conductor pattern (not shown) is formed in the upper and lower areas of the light-emitting element 232 on the second substrate 231. A plurality of conductor patterns are formed for each of a plurality of colors, and are formed separately above and below. In addition, an electrical component 234 such as a capacitor is mounted on this conductor pattern. The electrical component 234 such as a capacitor is provided at a position offset in the Z direction from the light-emitting element 232.

The light guide panel 410 Rayleigh scatters the light from the second light emitting substrate 230, and emits light that mimics a blue sky, for example, light with a color temperature of 25,000 lx or more on the blackbody locus. When the Rayleigh scattering of the light guide panel 410 is large, the color temperature of the light emitted by the second light emitting substrate 230 can be low, and when the Rayleigh scattering is small, the color temperature can be increased to emit light from the light guide panel 410 with a color temperature of 25,000 K or more, similar to that of a blue sky. The light emitted from the light emitting element 232 of the second light emitting substrate 230 may be referred to as the second light.

As shown in Figs. 8 and 9, the clip 250 fixes the first light-emitting board 220 to the first board mounting portion 213 of the light source body 210, and the second light-emitting board 230 to the board mounting portion 241 of the second body 240. The clip 250 is a U-shaped locking member, and is made of an elastically deformable resin or the like. Here, the light-emitting board is placed on the board mounting portion, and the clip 250 is inserted from the end side, thereby sandwiching and fixing the light-emitting board and the board mounting portion. Here, the light-emitting board is the first light-emitting board 220 or the second light-emitting board 230, and the board mounting portion is the first board mounting portion 213 or the second board mounting portion 218 of the light source body 210.

The clip 250 has an inner convex portion 251 formed on the inside of the U-shape. The inner convex portion 251 fits into the openings provided in the light-emitting substrate and the substrate mounting portion, respectively, and can prevent the clip 250 itself from coming off. Here, the openings are the opening 225 of the first light-emitting substrate 220, the opening 235 of the second light-emitting substrate 230, the opening 213d of the first substrate mounting portion 213 of the light source main body portion 210, and the opening 241a of the substrate mounting portion 241 of the second main body portion 240. The openings 213d and 241a on the substrate mounting portion side are round holes and are approximately the same size as the inner convex portion 251 of the clip 250, and the openings 225 and 235 on the light-emitting substrate side are elongated holes with their major axes facing the longitudinal direction of the light-emitting substrate. Because the openings 225 and 235 are elongated holes with their major axes oriented in the longitudinal direction of the light-emitting substrates, the first light-emitting substrate 220 and the second light-emitting substrate 230 are clamped by the clip 250 so that they can expand and contract due to heat.

If the first light-emitting board 220 and the second light-emitting board 230 are fixed so that they cannot expand or contract due to heat, deformation such as warping may occur. If the board warps, there is a problem that the board comes into contact with other parts, or the position of the light-emitting element serving as the light source is shifted, causing other problems. However, according to the lighting fixture 1 according to embodiment 1, the first light-emitting board 220 contacts and is pressed against the surface of the first board mounting portion 213 of the light source body 210 by the clip 250, and the second light-emitting board 230 contacts and is pressed against the board mounting portion 241 of the second body 240. In other words, the light-emitting board contacts and is pressed against the light source body. This makes it easier for heat to move from the light-emitting board to the light source body 210 and the second body 240. This improves the heat dissipation of the light-emitting board, and suppresses deformation of the light-emitting board due to heat. In addition, since the light-emitting board is attached to the light source body by being sandwiched in the surface direction between the groove and the clip 250, it has a structure that can absorb dimensional changes in the longitudinal direction due to expansion due to heat. This prevents the light-emitting substrate from deforming due to heat, and reduces damage and misalignment.

The lower reflecting portion 260 shown in Figs. 5 to 9 reflects light from the light emitting element 232 of the second light emitting substrate 230 and allows the light to enter the light guide panel 410. For this reason, the lower reflecting portion 260 is formed by bending a sheet having reflective properties into a Z-shape. The lower reflecting portion 260 suppresses loss of light from the light emitting element 232 and allows the light to enter the light guide panel 410 efficiently. The lower reflecting portion 260 also insulates the second light emitting substrate 230 from the light source body 210, and is interposed between the inside of the first groove portion 212 and the copper foil portion (not shown) of the second light emitting substrate 230.

The second light-emitting substrate 230 is held in a state in which the Z2-side edge 230a is held in the first groove 212 and movement toward the Z1 side is suppressed by the second claw 218b. The second light-emitting substrate 230 is suppressed from moving toward the Z1 side and is fixed integrally with the light source body 210, improving the heat dissipation efficiency of the second light-emitting substrate 230. As shown in FIG. 5, the light source unit 200 can be assembled integrally by inserting the second light-emitting substrate 230 into the first groove 212 of the light source body 210, and the second light-emitting substrate 230 can be held in the planar direction.

5, the light source unit 200 has the first light-emitting substrate 220 and the second light-emitting substrate 230 installed at different positions in the Y direction, and the end of the second light-emitting substrate 230, including the edge 230a, is partially accommodated in the first groove 212, thereby reducing the dimension of the light source unit 200 in the Z direction. In other words, the end of the first light-emitting substrate 220, including the edge 220a on the Z1 side, is positioned so as to overlap the end of the second light-emitting substrate 230, including the edge 230a on the Z2 side, in the Y direction. Note that the first groove 212 is inserted with the end of the second light-emitting substrate 230, including the edge 230a on the Z2 side, and protrudes in the Z2 direction, i.e., toward the side where the diffusion panel 310 and the light-emitting element 222 of the first light-emitting substrate 220 are arranged, but is formed so that the light of the light-emitting element 222 of the first light-emitting substrate 220 reaches the diffusion panel 310 without being blocked. The ends including the edges 220a and 230b on the Z1 side of the first light-emitting substrate 220 and the second light-emitting substrate 230 may be referred to as the upper ends. The ends including the edges 220b and 230a on the Z2 side of the first light-emitting substrate 220 and the second light-emitting substrate 230 may be referred to as the lower ends. Furthermore, the diffusion panel 310 may be referred to as the first light guide plate, and the light guide panel 410 may be referred to as the second light guide plate.

In addition, the first groove portion 212 is formed wider on the Z1 side than on the Z2 side in a cross section perpendicular to the longitudinal direction of the first light-emitting substrate 220 and the second light-emitting substrate 230 shown in FIG. 5, and prevents the first groove portion 212 from contacting the electrical components 234 on the second light-emitting substrate 230 when the second light-emitting substrate 230 is inserted. This structure of the first groove portion 212 allows the electrical components 234 to be arranged on the Z2 side of the light guide plate mounting portion 211, and the arrangement of the second light-emitting substrate 230 can be restricted to the Z2 side. By restricting the arrangement of the second light-emitting substrate 230 in the Z2 direction, the height dimension of the lighting device 1 can be restricted. This also prevents the lighting device 1 from becoming larger. At this time, the upper end of the first light-emitting substrate 220 is positioned so as to overlap with the lower end of the second light-emitting substrate 230 in the vertical direction. In other words, the upper end of the first light-emitting substrate 220 overlaps with the lower end of the second light-emitting substrate 230 when viewed in the Y direction, which contributes to reducing the Z-direction dimension of the lighting device 1.

(Stopper 270)
10 , the stopper 270 is partially inserted into and fixed in the first groove portion 212, and restricts movement of the second light-emitting substrate 230 in the horizontal direction XY relative to the light source body portion 210. In addition, the stopper 270 prevents the light guide panel 410 from contacting the light-emitting element 232 on the second light-emitting substrate 230.

13 is a perspective view of the stopper 270 shown in FIG. 10 viewed from above. FIG. 14 is a perspective view of the stopper 270 shown in FIG. 10 viewed from below. The stopper 270 has a stopper body 271 and a stopper leg 272 extending from the stopper body 271 in the Z2 direction. As shown in FIG. 10, FIG. 13, and FIG. 14, the stopper body 271 has a connector accommodating portion 271b in which the second connector 233 is accommodated. The connector accommodating portion 271b is formed so as to be recessed toward the side away from the second light-emitting substrate 230 when viewed from the second light-emitting substrate 230 side. The stopper body 271 has a board pressing portion 271a protruding from the side portion 271f. The board pressing portion 271a protrudes from the side portion 271f toward the center of the second light-emitting substrate 230 in the longitudinal direction, and is arranged side by side with the connector accommodating portion 271b in the X direction. The panel stopper 271c is positioned so as to be inserted between the light-emitting element 232 of the second light-emitting substrate 230 and the end surface 410a of the light-guiding panel 410. Therefore, movement of the second light-emitting substrate 230 in the planar direction is restricted, and the light-emitting element 232 and the end surface 410a of the light-guiding panel 410 do not come into contact with each other.

The substrate pressing portion 271a has a panel stopper 271c that abuts against the light guide panel 410 on the surface opposite to the surface that abuts against the second light emitting substrate 230 so that the end surface 410a of the light guide panel 410 does not contact the light emitting element 232. The substrate pressing portion 271a is thicker than the light emitting element 232. Therefore, the substrate pressing portion 271a prevents the light guiding panel 410 from being displaced toward the second light emitting substrate 230, and prevents the end surface 410a of the light guiding panel 410 from abutting against the light emitting element 232.

As shown in FIG. 13, the upper surface of the stopper 270 includes a pressing portion 271d. The pressing portion 271d has a horizontal receiving portion 271da against which the stopper pressing portion 280 shown in FIG. 5 abuts in the horizontal direction, and a vertical receiving portion 271db against which it abuts in the downward direction Z2. The horizontal receiving portion 271da and the vertical receiving portion 271db are formed to have a stepped shape (a shape that intersects at right angles). The height up to the vertical receiving portion 271db is approximately equal to the thickness of the light guide panel 410.

The stopper leg 272 fixes the stopper 270 to the light source body 210 and is inserted into the first groove 212 of the second light source body 210B. The stopper leg 272 protrudes downward in the Z2 direction from the stopper body 271. The stopper leg 272 also extends in the Y direction, i.e., extends perpendicular to the second light-emitting substrate 230, and is inserted into the first groove 212 of the second light source body 210B over the entire area in the Y direction.

Four stoppers 270 are arranged corresponding to the four corners of the light guide panel 410 placed on the light guide plate placement portion 211 of the light source body portion 210. The light guide panel 410 is surrounded by the side portion 271f and the panel stopper portion 271c of the stopper body portion 271, and the movement in the horizontal direction XY is suppressed. In other words, the corner portion formed by the side portion 271f and the panel stopper portion 271c of the stopper body portion 271 is located corresponding to the corner portion of the light guide panel 410, and regulates the relative positional relationship in the XY direction between the light source body portion 210 and the light guide panel 410. In other words, the panel stopper portion 271c is arranged along the end surface 410a facing the second light emitting substrate 230 of the light guide panel 410, and the side portion 271f of the stopper body portion 271 is arranged along the end surface 410b adjacent to the end surface 410a, so that the displacement of the light guide panel 410 in the XY direction is regulated. In addition, end surface 410a may be referred to as the first end surface, and end surface 410b may be referred to as the second end surface. Each of the four stoppers 270 is disposed so that the board pressing portion 271a and the connector housing portion 271b face the second light-emitting board 230.

As shown in FIG. 10, the stopper leg 272 is a structure for fixing the stopper 270 to the light source body 210, and is inserted and fitted into the first groove 212 of the second light source body 210B. When the two light source bodies 210 are arranged with their ends butted together so as to be perpendicular to each other, the stopper 270 is arranged so that the board pressing portion 271a is placed between the second light-emitting board 230 attached to one of the first light source body parts 210A and the light guide panel 410, and the stopper leg 272 is fitted into the first groove 212 of the other second light source body part 210B to straddle them.

(Stopper holding portion 280)
15, 16, 17, 18, and 19 are perspective views showing a process of attaching the light guide panel 410 to the light source unit 200 in the lighting device 1 according to the first embodiment. As shown in FIGS. 18 and 19, the stopper pressing unit 280 has a pressing leg 281 attached to the component mounting portion 216 of the second light source body 210B, and a pressing body 282 that presses the light guide panel 410 from above while covering the stopper 270. The pressing leg 281 is disposed along the upper surface of the second light source body 210B and is fixed by a fixing means such as a screw 902. In the X direction, a connecting portion 284 extending upward is formed at an end of the pressing leg 281 located on the inside of the light source unit 200. A pressing body 282 extending in the inside direction of the light source unit 200 in the X direction is formed at an end of the Z1 side of the connecting portion 284. That is, the stopper pressing portion 280 is bent into a crank shape when viewed from the Y direction, and is configured to press the stopper 270 and the light guide panel 410 from above. In other words, the stopper 270 and the light guide panel 410 are positioned and fixed by being sandwiched between the light guide plate mounting portion 211 and the pressing body portion 282 of the stopper pressing portion 280.

The pressing body 282 is flat and is longer than the width in the X direction of the vertical receiving portion 271db of the stopper 270. In addition, the pressing body 282 has a pressing side portion 283 protruding from the side of the pressing body 282 toward the upward direction Z1. This increases the rigidity of the pressing body 282 in the bending direction relative to the XY plane. In addition, as shown in FIG. 5, a panel cushioning material 280a is arranged between the pressing body 282 and the light guide panel 410 to prevent the light guide panel 410 from being damaged when the pressing body 282 abuts against the light guide panel 410. In addition, when the reflective sheet 420 is pressed, the unevenness of the surface becomes flat and the light is totally reflected. Then, although the reflective sheet 420 reflects light in the horizontal direction XY, the amount of light reflected in the downward direction Z2 is reduced, and the light irradiated from the light guide panel 410 is reduced. According to the first embodiment, the stopper pressing portion 280 partially presses the light guide portion 400 near the corner of the light guide panel 410, and the height of the stopper 270 and the height of the light guide portion 400 are appropriately set so that the reflective sheet 420 is not excessively pressed. As a result, the amount of light irradiated from the light guide panel 410 is not reduced, and the illumination capacity of the lighting device 1 is improved.

(Diffusion Panel Section 300)
5, the diffusion panel section 300 diffuses and transmits light from a first light emitting substrate 220 attached to the lower part of the light source main body section 210. The diffusion panel section 300 has a diffusion panel 310 having transparency, a first packing 320 provided on an end face of a lower end of the diffusion panel 310, and a second packing 330 provided on an end face 310a of an upper end of the diffusion panel 310. The second packing 330 is sandwiched between the light guide panel 410 and the light guide plate mounting section 211 between the pressing side recess 211a of the light source main body section 210 and the light guide panel 410.

The diffusion panel 310 is arranged so as to slope inwardly of the lighting fixture 1 as it approaches the Z1 side. As shown in FIG. 3, the diffusion panel 310 has a shape in which four sloped surfaces are arranged in a square shape. In other words, the diffusion panel 310 has a shape composed of the side surfaces of a truncated quadrangular pyramid with no apex.

The diffusion panel 310 is placed on the second mounting portion 112 of the frame portion 100 together with the first packing 320. The end surface 310a on the Z1 side of the diffusion panel 310 is covered by the light guide panel 410 via the second packing 330 by attaching the light source unit 200 to the frame portion 100. In other words, the diffusion panel 310 is sandwiched vertically between the frame portion 100 and the light guide panel 410. At least a part of the end surface 310a of the upper end of the diffusion panel 310 faces the irradiation surface 411 of the light guide panel 410. The diffusion panel 310 irradiates the horizontal light irradiated from the light emitting element 222 of the first light emitting substrate 220 in a diagonally downward direction.

The diffusion panel 310 is formed, for example, from a white resin plate material. The white resin material may be a milky material, or a transparent material with white screen printing on the back side. In addition, for the portion of the diffusion panel 310 where shade is to be produced, a light-shielding print is performed on the back side of the white material, i.e., on the surface facing the first light-emitting substrate 220. At this time, black printing may be performed on top of the white printing, or gray, white, and black may be printed on the back of the white in that order. In this way, by partially providing the diffusion panel 310 with a light-shielding print on the back of the white, the lighting device 1 can produce shade by making the diffusion panel 310, which has a portion of the light-shielding print, white when it is not lit and black when it is lit.

In addition, the diffusion panel 310 is subjected to a light-shielding treatment on the surface facing the light guide panel 410. This is because, when light from the first light-emitting substrate 220 is incident on the diffusion panel 310, some light is guided inside the plate material and exits from the end surface 310a. The light from the end surface 310a of the diffusion panel 310 is incident on the light guide panel 410, and causes a part of the light guide panel 410, which is intended to emit blue light, to emit white light. Therefore, it is preferable to perform a light-shielding treatment on the upper Z1 side end of the diffusion panel 310. For example, the light-shielding treatment is performed by first performing a white screen printing on the end to become a reflective portion (not shown), and then performing a black screen printing on the shading portion (not shown). The reflective portion reflects the light incident on the diffusion panel 310 into the diffusion panel 310 when it diffuses and reaches the end surface 310a. By performing this treatment, the light guided inside the diffusion panel 310 is reflected by the reflective portion of the end surface 310a. Any light that is not reflected by the reflecting section is blocked by the light blocking section.

If there were no white reflecting portion at the end of the diffusion panel 310, the light that reaches the end surface 310a of the diffusion panel 310 would be reflected by the light-shielding portion, and the end surface 310a of the diffusion panel 310 would appear black. This could cause the light-emitting portion of the light guide panel 410 and the light-emitting portion of the diffusion panel 310 to appear separated by a black line. Also, if the end of the diffusion panel 310 is covered with an aluminum plate or packing material to block light, a dark portion equivalent to the material thickness of the member covering the end would be visible, and the light-emitting portion of the light guide panel 410 and the light-emitting portion of the diffusion panel 310 could appear separated by a black line.

Therefore, in the lighting device 1 according to the first embodiment, the end face on the Z1 side of the diffusion panel 310 is screen-printed in two colors to block reflections, thereby solving the above-mentioned problems, and the light-emitting portion of the light guide panel 410 and the light-emitting portion of the diffusion panel 310 can be made to look integrated. Also, as shown in FIG. 5, even when the second packing 330 is sandwiched between the end face 310a of the diffusion panel 310 and the light guide panel 410, it is sufficient to only interpose the second packing 330 on a part of the end face 310a on the first light-emitting substrate 220 side, rather than covering the entire end face 310a of the diffusion panel 310. As shown in FIG. 5, a gap is formed between the irradiation surface 411 located on the Z2 side of the light guide panel 410 and the end face 310a of the diffusion panel 310, but the gap is prevented from being noticeable by the light irradiated from the light guide panel 410. Also, the light-shielding portion formed on the end face 310a of the diffusion panel 310 can prevent the light from the light guide panel 410 from entering the diffusion panel 310.

As shown in FIG. 4, the light guide unit 400 is provided so as to be exposed from an opening of the light source unit 200 formed in a square shape. Also, as shown in FIG. 3 and FIG. 5, the light guide unit 400 has a light guide panel 410 and a reflective sheet 420.

As shown in FIG. 5, the light guide panel 410 receives light from the second light emitting substrate 230 at its end surface 410a and diffuses and irradiates the light. The light guide panel 410 diffuses and irradiates multiple lights from the second light emitting substrate 230. The lighting device 1 according to the first embodiment irradiates light that is mixed in the light guide panel 410 to mimic a blue sky, for example, light with a color temperature of 25,000 lx or higher on the blackbody locus.

The reflection sheet 420 is placed on the placement surface 412, which is the surface opposite to the irradiation surface 411 of the light guide panel 410. The reflection sheet 420 and the placement surface 412 of the light guide panel 410 are preferably fixed by attaching their outer peripheries. In this case, it is preferable that the attachment location of the reflection sheet 420 and the placement surface 412 of the light guide panel 410 is a portion facing the light guide plate placement unit 211, which is not visible due to being blocked by the light source unit 200 when the light guide panel 410 is viewed from the Z2 side.

The reflecting sheet 420 reflects the light coming from the second light emitting substrate 230 toward the upward direction Z1. The light incident on the light guide panel 410 from the second light emitting substrate 230 is reflected by the reflecting sheet 420 to prevent leakage to the Z1 side, propagates through the light guide panel 410, and is irradiated from the irradiation surface 411. The reflecting sheet 420 is formed of, for example, a resin, and the surface on the light guide panel 410 side has a fine uneven shape. A gap is provided between the concave part of the uneven shape and the mounting surface 412 of the light guide panel 410, and an air layer is formed between the mounting surface 412. The reflecting sheet 420 diffuses light due to this uneven shape. The reflecting sheet 420 is placed on the mounting surface 412, which is the upper surface of the light guide panel 410, and has unevenness on the surface on the light guide panel 410 side, so that the light incident on the light guide panel 410 can be propagated and irradiated with a simple structure, and the cost of the lighting device 1 can be reduced.

The upper reflector 290 is disposed above the end surface 410a of the light guide panel 410. The upper reflector 430 is similar to the lower reflector 260 and is disposed so as to cover the upper portion of the gap between the light guide panel 410 and the second light emitting substrate 230. The upper reflector 430 is formed by bending a sheet having reflective properties into an L-shape. The upper reflector 430 also has the effect of protecting the surface of the second substrate 231 on the upward Z1 side. As shown in FIG. 18 and FIG. 19, the portion of the upper reflector 290 located along the second substrate 231 has a convex portion 291 formed by protruding a part of the edge on the upward Z1 side in the Z1 direction. The convex portion 291 of the upper reflector 290 is fixed to the second substrate mounting portion 218 together with the second substrate 231 by a clip 250.

As shown in FIG. 18, before the second light-emitting substrate 230 and the upper reflector 290 are fixed, the second light-emitting substrate 230 is attached to the second substrate attachment portion 218 by the clip 250. At this time, the clips 250 are not attached at all points, but are attached to the center and both ends of the second light-emitting substrate 230. After the light guide panel 410 is placed on the light source unit 200, the upper reflector 290 is arranged along the second substrate attachment portion 218 so as to close the gap between the end surface 410a of the light guide panel 410 and the second light-emitting substrate 230, and is fixed by the clip 250. At this time, the convex portion 291 of the upper reflector 290 is arranged so as to avoid the previously attached clip 250, and the convex portion 291 of the upper reflector 290, the second light-emitting substrate 230, and the second substrate attachment portion 218 are sandwiched by the clip 250 to be integrated.

Next, the process of assembling the light guide unit 400 to the light source unit 200 will be described using Figures 15, 16, 17, 18, and 19. Assembling the light source unit 200 and the light guide unit 400 is easy, as shown in Figures 15 to 19. The light guide unit 400 can be assembled to the light source unit 200 from the Z1 side, and there is no need to work from the Z2 side, so there is no need to turn it over to work, and the assembly work is easy.

In the first step shown in FIG. 15, the first light source body 210A and the second light source body 210B are arranged in a square shape, and the second light emitting board 230 is attached to the second board mounting part 218 of the first light source body 210A using the clip 250. In this state, the stopper leg 272 of the stopper 270 is inserted into the first groove part 212 of the second light source body 210B, and the stopper 270 is arranged. At this time, the stopper 270 is arranged so that the board pressing part 271a presses between the two-wire connector 233a and the single-wire connector 233b, and the two-wire connector 233a is accommodated in the connector accommodating part 271b. The second light emitting board 230 is in a state of being pressed toward the second board mounting part 218 by the stopper 270. The second light emitting board 230 is fixed to the second board mounting part 218 at least at the end in the longitudinal direction, i.e., the X-direction.

In the second step shown in FIG. 16, the light guide panel 410 is accommodated in an area surrounded by the side portions 271f and panel stopper portions 271c of the stopper body portions 271 of the stoppers 270 arranged at the four corners of the light source body portion 210 of the light source unit 200. Note that the reflective sheet 420 is placed and fixed on the light guide panel 410 in advance.

In the third step shown in FIG. 17, the stopper retainer 280 is fixed to the light source body 210. The stopper retainer 280 is fixed to the component attachment portion 216 of the second light source body 210B. A panel cushioning material 280a is disposed between the light guide panel 410 and the reflective sheet 420 and the retainer body 282 of the stopper retainer 280.

In the fourth step shown in FIG. 18, the upper reflector 290 is placed so as to cover the space between the light guide panel 410 and the second light emitting substrate 230. The convex portion 291 of the upper reflector 290 is fixed to the second light emitting substrate 230 and the second substrate attachment portion 218 by the clip 250.

Figure 19 shows the state in which the light source unit 200 and the light guide unit 400 are assembled. The state in which the frame unit 100, the light source unit 200, and the light guide unit 400 are combined, which is the state before the power supply unit 500 is assembled, may be referred to as a light source assembly. Through the above process, the light guide unit 400 is attached to the light source unit 200. The light guide panel 410 can be fixed with the stopper 270 and the stopper pressing unit 280, and can be easily fixed with a smaller member than when the light guide panel 410 is covered from above with a plate material or the like, thereby reducing weight. In addition, by using the second light source body unit 210B without the second board mounting unit 218, the stopper pressing unit 280 can cover and press the stopper 270 with a simple structure. In addition, because the upper reflector 290 is separate from the reflector sheet 420, even if the reflector sheet 420 moves together with the light guide panel 410 and the gap between the second light emitting substrate 230 becomes large, the gap can be closed.

Figure 20 is a perspective view of the lighting fixture 1 according to embodiment 1 as viewed from above. Figure 21 is a perspective view showing the lighting fixture 1 according to embodiment 1 with the cover unit 600 removed. The power supply unit 500 supplies power to the first light-emitting board 220 and the second light-emitting board 230 and controls the lighting of the lighting fixture 1. The power supply unit 500 includes a power supply frame 510, a lighting control circuit board 520, and a communication unit 530. The power supply frame 510 is attached to the component attachment portion 216 of the second light source body portion 210B, and is disposed so as to cover the upper part of the light-guiding portion 400. The power supply frame 510 has the lighting control circuit board 520 and the communication unit 530 mounted on the upper surface.

Figure 22 is a perspective view of the power supply frame 510 of Figure 21. The power supply frame 510 has a circuit holding portion 511 that holds the lighting control circuit board 520 and the communication unit 530. The circuit holding portion 511 has a flat surface, but is provided with a signal opening 511a so as not to block signals for communication. The signal opening 511a is opened on the surface on which the communication unit 530 is placed. The signal opening 511a is a circular hole shape, but may also be provided in a linear shape such as a slit shape.

The power supply frame 510 has frame legs 512 that protrude downward from the end of the circuit holding section 511. The frame legs 512 are fixed to the component mounting section 216 of the second light source body section 210B of the light source section 200, and position the circuit holding section 511 so that a gap is provided between the circuit holding section 511 and the upper surface of the light guiding section 400. By providing a gap between the circuit holding section 511 and the upper surface of the light guiding section 400, the signal receiving section (not shown) and antenna (not shown) of the communication unit 530 can protrude from the signal opening 511a to the Z2 side.

The lighting control circuit board 520 supplies power to each of the first light emitting board 220 and the second light emitting board 230. The communication unit 530 receives signals from the outside via wireless communication, infrared communication, etc., and transmits signals related to lighting to the lighting control circuit board 520. The power supply unit 500 is attached opposite the light guiding unit 400, so that the light guiding unit 400 side is not blocked by a metal member, and therefore the power supply unit 500 can receive signals coming from the irradiation side, i.e., the Z2 side. In addition, since there is no metal member between the power supply unit 500 and the light guiding unit 400, the weight of the lighting fixture 1 can be reduced. In addition, the power supply unit 500 directly faces the air layer between the reflective sheet 420 and the lid unit 440, improving heat dissipation.

21, the cover section 600 is generally box-shaped with an opening on the downward Z2 side, and covers the power supply section 500, the light guide section 400, and the second light-emitting substrate 230 that protrudes from the light guide section 400 in the upward Z1 direction from above. The cover section 600 has a cover opening 610 formed on the side to which the terminal block unit 700 is connected. In addition, the cover section 600 is configured to cover the second light-emitting substrate 230, the light guide section 400, and the power supply section 500 collectively, rather than covering each of them individually, thereby making it possible to simplify the configuration and reduce weight. Note that the combination of the frame section 100, the light source section 200, the light guide section 400, the power supply section 500, and the cover section 600 may be referred to as a light source unit.

20, the cover portion 600 is formed to have a smaller width than the frame portion 100 in the XY direction. In other words, the side surface 611 of the cover portion 600 is located closer to the center of the lighting fixture 1, that is, closer to the inside of the lighting fixture 1, than the surface of the frame side portion 110, which is the side surface of the frame portion 100. In the lighting fixture 1, an electric wire arrangement portion 601, which is an area where a power line or a signal line is arranged, is formed in the corner formed by the cover portion 600 and the frame portion 100. The electric wire arrangement portion 601 is a space formed by the corner of the step formed by the side surface 611 of the cover portion 600 and the frame portion 100, and is an area on the outer side in the X direction from the side surface 611 of the cover portion 600 and on the Z1 side from the upper surface of the frame portion 100. In the lighting fixture 1, the second light-emitting substrate 230 is arranged corresponding to two opposing side edges of the four side edges of the lighting fixture 1. The electric wire arrangement section 601 is formed corresponding to two opposing side edges where the second light emitting board 230 is not arranged. Therefore, the lighting device 1 can be formed so that the width dimension between the opposing side surfaces 611 of the cover section 600 is smaller than the width dimension of the frame section 100, and the electric wire arrangement section 601 can be provided widely. The terminal block unit 700 is attached to the lid section 440, arranged so as to cover the cover opening 610 of the cover section 600, and fixed so as to protrude from the side surface 611 of the cover section 600.

Figure 23 is a perspective view of the terminal block unit 700 shown in Figure 21, as seen from above. Figure 24 is a perspective view of the terminal block unit 700 shown in Figure 21, as seen from below. Figure 25 is an exploded perspective view of the terminal block unit 700 shown in Figure 21, as seen from above. Figure 26 is an exploded perspective view of the terminal block unit 700 shown in Figure 21, as seen from below. The terminal block unit 700 includes a power terminal block 710 to which a power line (not shown) for power supply is connected, a signal terminal block 720 to which a signal line (not shown) from the outside is connected, and a terminal block frame 730 to which the power terminal block 710 and the signal terminal block 720 are attached.

As shown in Figures 23 to 26, the power terminal block 710 has a generally rectangular parallelepiped shape, and has a power line insertion section 711 into which the power line is inserted on one side of the rectangular parallelepiped shape. The signal terminal block 720 also has a generally rectangular parallelepiped shape, and has a signal line insertion section 721 into which the signal line is inserted on one side of the rectangular parallelepiped shape. As shown in Figure 20, the power terminal block 710 and the signal terminal block 720 are arranged to protrude from the side surface 611 of the cover portion 600.

The terminal block frame 730 has a wiring housing 731 that houses the electric wires (also called output electric wires, not shown) that connect the power supply terminal block 710 and the signal terminal block 720 to the power supply unit 500. The wiring housing 731 is arranged to protrude from the side surface 611 of the cover unit 600. The terminal block frame 730 also has mounting portions 732 that protrude from both ends of the wiring housing 731 in the Y direction. As shown in Figures 25 and 26, the wiring housing 731 has openings 734 and 735 through which the insertion ports of the output electric wires of the power supply terminal block 710 and the signal terminal block 720 are inserted.

As shown in Figures 23 to 26, the power terminal block 710 and the signal terminal block 720 are attached to the terminal block arrangement portions 732a of the mounting portions 732 provided in pairs at both ends of the terminal block frame 730 in the Y direction. The power terminal block 710 and the signal terminal block 720 are arranged so that the power line insertion portion 711 and the signal line insertion portion 721 face in opposite directions. In other words, the power terminal block 710 and the signal terminal block 720 are arranged so that the directions in which electric wires are inserted from outside face in opposite directions.

In addition, the terminal block frame 730 of the terminal block unit 700 is opened so that the power line insertion portion 711 of the power terminal block 710 and the signal line insertion portion 721 of the signal terminal block 720 face in a direction along the side surface 611 of the cover portion 600 when attached to the cover portion 600. In other words, the side surface 611 of the cover portion 600 and the surface on which the power line insertion portion 711 and the signal line insertion portion 721 are formed are provided in a direction that intersects with each other, and are vertical in the first embodiment. As a result, the lighting fixture 1 can insert the power line and the signal line along the side surface 611 of the cover portion 600. In addition, the lighting fixture 1 can arrange the power line and the signal line in the electric wire arrangement portion 601. Therefore, even if a plurality of lighting fixtures 1 are arranged adjacent to each other, it is possible to suppress the power line from interfering with the adjacent lighting fixtures 1. In addition, it is possible to suppress the power line from being arranged to protrude upward in the Z1 direction of the lighting fixture 1, and it is possible to suppress the power line from interfering with the body. In addition, the power terminal block 710 and the signal terminal block 720 are arranged so that the wiring housing portion 731 is sandwiched between them, thereby preventing the height of the lighting fixture 1 from becoming too high. The power terminal block 710 and the signal terminal block 720 may be collectively referred to as a connector.

In the first embodiment, the ends of electric wires from which the covering has been removed and the conductors are exposed are inserted into the power line insertion portion 711 and the signal line insertion portion 721. However, the power line insertion portion 711 and the signal line insertion portion 721 may also be configured to have a connector member (not shown) inserted into them. In this case, the connector member is attached to the portion of the electric wire where the conductors are exposed in the first embodiment, and is connected to the power line insertion portion 711 and the signal line insertion portion 721.

As described above, the lighting fixture 1 of the first embodiment includes a connector arranged so that an electric wire from the outside is inserted into the power line insertion portion 711 or the signal line insertion portion 721 along the side surface 611 of the cover portion 600. With this configuration, the lighting fixture 1 can connect electric wires from the outside, such as power lines and signal lines, to the connector in a direction along the side surfaces of the frame portion 100 and the light source portion 200. The electric wire from the outside can be arranged to the side of the lighting fixture 1 along the side surface 611 of the cover portion 600 of the lighting fixture 1. The terminal block unit 700 is provided so as to protrude from the side surface 611 of the cover portion 600 attached to the light source portion 200, and the connector is inserted along the side surface 611. Therefore, the electric wire connected to the terminal block unit 700 is positioned so as to extend in a direction parallel to the side surfaces of the frame portion 100, the light source portion 200, and the cover portion 600. This prevents the wires connected from expanding toward the side away from the lighting fixture 1, making it less likely for the wires to come into contact with surrounding fixtures or ceiling materials. This prevents the wires from being damaged by being scratched or pinched.

(Modification)
Fig. 27 is a perspective view of lighting fixture 1001 which is a modified example of lighting fixture 1 according to embodiment 1. Lighting fixture 1001 according to the modified example has a light source unit 1200 as a part corresponding to lighting fixture 1, and light source unit 1200 is attached to fixture body 1100 which is installed on a ceiling (mounting portion). Note that the main difference between light source unit 1200 and lighting fixture 1 is the shape of frame portion 1210 and cover portion 1220, and a description of the common structure will be omitted.

Figures 28, 29, and 30 are exploded perspective views of the lighting fixture 1001 in Figure 27. Figure 31 is an explanatory diagram of the cross-sectional structure of the lighting fixture 1001 in Figure 27. The lighting fixture 1001 includes a fixture body 1100 that is attached to a mounting portion 900 on the ceiling, and a light source unit 1200 that is detachably attached to the fixture body 1100.

The device body 1100 includes a main body 1110 that is box-shaped with one side open, a terminal block 1120, and a receiving portion 1130. The main body 1110 has a mounting hole 1112 formed in the approximate center of the bottom surface 1111 of the main body, into which a fixing device such as a hanging bolt is inserted.

The terminal block 1120 is connected to a power supply line (not shown) and has a terminal block connector 1121. It is also disposed at a position offset from the mounting hole 1112 on the bottom surface 1111 of the main body.

The receiving portion 1130 is provided on the side of the main body portion 1110 and engages with the mounting spring 1230 provided on the light source unit 1200 to fix the light source unit 1200 to the fixture body 1100.

The frame 1210 of the light source unit 1200 has the same configuration as the frame 100 of the lighting fixture 1 according to embodiment 1, and also has a flange 1211 that covers the edge of the opening of the fixture body 1100, and a rising portion 1212 to which the mounting spring 1230 is attached.

As shown in FIG. 29, the lid portion 1220 of the light source unit 1200 has a first lid portion 1221 that covers one of the second light-emitting boards 230 and the power supply unit 500, and a second lid portion 1222 that covers the other second light-emitting board 230. In the Y direction, the second lid portion 1222 is formed shorter than the first lid portion 1221, and a storage portion 1223 is provided between the first lid portion 1221 and the second lid portion 1222. The storage portion 1223 is disposed on the second lid portion 1222 side from the center side in the Y direction.

The mounting spring 1230 fixes the light source unit 1200 to the fixture body 1100 and engages with the receiving portion 1130. The mounting spring 1230 is a V-shaped elastic wire. The light source unit 1200 also has a power supply side connector 1224 that connects to the terminal block connector 1121 to receive power via the terminal block 1120.

When the light source unit 1200 is attached to the fixture body 1100, the fixing device such as the hanging bolt and the terminal block 1120 are placed inside the housing portion 1223. The terminal block 1120 is placed closer to the center on the second cover portion 1222 side, so it can be placed in the housing portion 1223. Therefore, the lighting fixture 1001 can be made thinner in the vertical direction.

1 Lighting fixture, 100 Frame portion, 110 Frame side portion, 111 First mounting portion, 112 Second mounting portion, 112a Mounting recess, 112b Frame control portion, 112c Reflecting surface, 120 Mounting bracket, 121 Claw portion, 122 Connection portion, 123 Fixing portion, 200 Light source portion, 200A First light source assembly, 200B Second light source assembly, 210 Light source body portion, 210A First light source body portion, 210B Second light source body portion, 210a L-shaped bracket, 211 Light guide plate mounting portion, 211a Pressing side recess, 211b Step portion, 211c Surface, 212 First groove portion, 213 First board mounting portion, 213a Second groove portion, 213aa Body opening, 213b Claw portion, 213d Opening, 215 Fixing portion, 216 Component mounting portion, 217 Main body reflecting portion, 217a First reflecting portion, 217b Second reflecting portion, 217c Third reflecting portion, 218 Second board mounting portion, 218a Abutment surface, 218aa Main body opening, 218b Second claw portion, 219 Slope, 220 First light-emitting board, 220a Edge, 220b Edge, 221 First board, 222 Light-emitting element, 223 Connector, 225 Opening, 230 Second light-emitting board, 230a Edge, 231 Second board, 232 Light-emitting element, 233 Second connector, 233a Connector, 233b Connector, 234 Electrical part, 235 Opening, 240 Second main body portion, 241 Board mounting portion, 241a Opening, 250 Clip, 251 Inner convex portion, 260 Lower reflecting portion, 270 Stopper, 271 Stopper main body, 271a Board pressing portion, 271b Connector accommodating portion, 271c Panel stopper, 271d Pressing portion, 271da Horizontal receiving portion, 271db Vertical receiving portion, 271f Side portion, 272 Stopper leg portion, 280 Stopper pressing portion, 280a Panel cushioning material, 281 Pressing leg portion, 282 Pressing main body portion, 283 Pressing side portion, 284 Connection portion, 290 Upper reflecting portion, 291 Convex portion, 300 Diffusion panel portion, 310 Diffusion panel, 310a End surface, 312 Incident surface, 313 Exit surface, 320 First packing, 330 Second packing, 400 Light guide portion, 410 Light guide panel, 410a End surface, 411 Irradiation surface, 412 Placement surface, 420 Reflective sheet, 430 Upper reflecting portion, 440 Lid portion, 500 Power supply portion, 510 Power supply frame, 511 Circuit holding portion, 511a Signal opening, 512 Frame leg portion, 520 Lighting control circuit board, 530 Communication unit, 600 Cover portion, 601 Electric wire arrangement portion, 610 Cover opening, 611 Side, 700 Terminal block unit, 710 Power supply terminal block, 711 Power line insertion portion, 720 Signal terminal block, 721 Signal line insertion portion, 730 Terminal block frame, 731 Wiring housing portion, 732 Mounting portion, 732a Terminal block arrangement portion, 734 Opening, 900 Mounting portion, 901 T-bar, 902 Screw, 1001 Lighting fixture, 1100 Fixture body, 1110 Body portion, 1111 Body bottom portion, 1112 Mounting hole, 1120 Terminal block, 1121 terminal block connector, 1130 receiving portion, 1200 light source unit, 1210 frame portion, 1211 flange portion, 1212 rising portion, 1213 first mounting portion, 1217 reflective surface, 1217a first reflective portion, 1217c third reflective portion, 1220 lid portion, 1221 first lid portion, 1222 second lid portion, 1223 storage portion, 1224 power supply side connector, 1230 mounting spring, A area, B area, C area, D area, E area, L optical axis, L1 optical axis, M outer surface, N inner surface.

Claims (4)

a light emitting substrate on which a light emitting element that emits light in a first direction is disposed;
a plate-shaped diffusion panel located in the first direction of the light emitting substrate and diffusing the light from the light emitting element;
a structural member supporting the light emitting substrate and the diffusion panel;
The diffusion panel includes:
an incidence surface which is one surface of the diffusion panel and faces the light emitting substrate;
an exit surface which is the other surface of the diffusion panel;
The entrance surface is
The first direction is inclined with respect to the first direction.
The structural member is
a first substrate attachment portion to which the light emitting substrate is fixed;
a main body reflecting portion extending in the first direction from an end of the first board mounting portion and facing the incident surface;
The main body reflector is
Reflecting the light from the light emitting element ;
The main body reflector is
a portion of the light-receiving portion protruding toward the light-receiving surface side to form a first reflecting portion and a second reflecting portion;
The first reflecting portion and the second reflecting portion are
Formed by curved surfaces,
The first reflecting portion is
a curved surface that is concave when viewed from the incident surface side and is located closer to the light emitting substrate than the second reflector in the first direction,
The second reflecting portion is
A lighting device , wherein the light receiving portion is formed continuously from the first reflecting portion, has an arc-shaped cross-sectional shape, and is a curved surface that is convex toward the incident surface . The main body reflector is
a third reflecting portion that is a flat surface;
The third reflecting portion is
The lighting device according to claim 1 , wherein the first reflecting portion and the second reflecting portion are positioned closer to the first direction than the first reflecting portion and the second reflecting portion, and are positioned farther from the optical axis than the first reflecting portion and the second reflecting portion. The structural member is
The lighting device according to claim 2 , further comprising a structure supporting one end of the diffusion panel in the first direction of the third reflecting portion. The diffusion panel includes:
When a direction perpendicular to the first direction is defined as a second direction,
one end of the incident surface is located on the second direction side of the light emitting substrate, and the other end of the incident surface is located on the first direction side of the one end of the incident surface,
The structural member is
a reflecting surface facing the incident surface;
The reflective surface is
The lighting device according to any one of claims 1 to 3 , which is located between the light-emitting substrate and the other end of the incident surface in the second direction.

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