Luminaire

Abstract

To provide a luminaire capable of increasing an amount of light emitted from a portion where light from a first light source part is emitted.SOLUTION: A luminaire for emitting light at least from a first principal surface of a light guide plate 41, comprises: a first light source part 31 arranged on a second principal side on the opposite side of the first principal surface of the light guide plate 41; and a second light source part 33 arranged oppositely to an end face of the light guide plate 41, wherein light from the first light source part 31 is made incident from the second principal surface side and then is emitted from the first principal surface, and light from the second light source part 33 which is made incident from an end face side is propagated in the light guide plate 41 and then is emitted from the first principal surface side.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an illumination device including a first light source unit and a second light source unit. [Background technology]

[0002] The lighting device comprises a main body, a power supply, a housing, a light guide plate (80), a frame (70), a light diffusion cover (30), a main light source (50), and an auxiliary light source (73), the main light source being arranged opposite the light diffusion cover, and the auxiliary light source being arranged on the frame outside the main light source and opposite the end face of the light guide plate (see Figure 3). Light from the main light source is emitted from the diffusion cover, and light from the secondary light source is emitted from a light guide plate disposed outside the light diffusion cover, so that the two light sources can provide separate illumination. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-108659 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-described lighting device has a problem in that it is not possible to increase the amount of light (brightness) emitted from the portion (light diffusion cover) facing the main light source. An object of the present invention is to provide an illumination device that can increase the amount of light emitted from a portion that emits light from a first light source section. [Means for solving the problem]

[0005] An illumination device according to the present invention is an illumination device that emits light from at least a first main surface of a light guide plate, and includes a first light source unit arranged on a second main surface side of the light guide plate opposite the first main surface, and a second light source unit arranged opposite an end surface of the light guide plate, wherein light from the first light source unit enters from the second main surface side and exits from the first main surface, and light from the second light source unit that enters from the end surface side propagates within the light guide plate and exits from the first main surface side. [Effects of the Invention]

[0006] According to the above configuration, it is possible to increase the amount of light emitted from the light emitting portion of the first light source unit. [Brief explanation of the drawings]

[0007] [Figure 1] 1A and 1B are perspective views of an illumination device according to an embodiment, in which FIG. 1A is a view from below, and FIG. 1B is a view from above. [Figure 2] 1A and 1B are perspective views of the lighting device in an exploded state, where FIG. 1A is a view from below, and FIG. 1B is a view from above. [Figure 3] FIG. 2 is a cross-sectional view of a main part of the lighting device. [Figure 4] (a) is an oblique view from above of the power supply unit and inner cover disassembled and removed from the base, (b) is an oblique view of the power supply cover from above, and (c) is an oblique view of the power supply cover from below. [Figure 5] 10 is a perspective view showing a state in which the base of the device body and the light guide plate are separated, and the light source unit and the like are disassembled from the base, and a state in which the light output unit and the like are disassembled from the light guide plate, as viewed from below. FIG. [Figure 6] 10 is a perspective view seen from above of the device body with the base and light guide plate separated, with the light source unit and other components disassembled from the base, and the light output unit and other components disassembled from the light guide plate. FIG. [Figure 7] 1A and 1B are perspective views of the base, where FIG. 1A is a view from below and FIG. 1B is a view from above. [Figure 8](a) is a perspective view from below of the light guide plate with the outer cover, light-emitting ring, and lower reflector removed, (b) is an enlarged cross-sectional view of the light guide plate, (c) is an enlarged cross-sectional view of the outer cover, (d) is an enlarged cross-sectional view of the light-emitting ring, and (e) is an enlarged cross-sectional view of the lower reflector. [Figure 9] (a) is a diagram for explaining the installation of the light guide plate, base, upper reflector, and lower reflector, (b) is a perspective view of the upper reflector from below, (c) is a perspective view of a part of the upper reflector from above, and (d) is an enlarged cross-sectional view of the upper reflector. [Figure 10] 1(a) is a schematic diagram showing the state of light emitted from a first light source module, and FIG. 1(b) is a schematic diagram showing the state of light emitted from a second light source module. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Summary> A first lighting device according to an embodiment is an illumination device that emits light from at least a first main surface of a light guide plate, the illumination device including: a first light source unit arranged on a second main surface side of the light guide plate opposite the first main surface; and a second light source unit arranged opposite an end surface of the light guide plate, wherein light from the first light source unit enters from the second main surface side and exits from the first main surface, and light from the second light source unit that enters from the end surface side propagates through the light guide plate and exits from the first main surface side. This allows light from the second light source unit as well as light from the first light source unit to exit from the first main surface side of the light guide plate, thereby increasing the amount of light emitted from the first main surface.

[0009] A second lighting device according to an embodiment is the first lighting device, and further includes an optical processing section on the second main surface side of the light guide plate that directs light from the first light source section toward the second main surface side of the light guide plate. This increases the light extraction efficiency of the first light source section. This makes it difficult to identify the light source position of the first light source section, reducing the graininess of the light source when viewed from the illumination side. By adjusting the optical processing section, the light distribution emitted from the first main surface can be easily adjusted.

[0010] A third lighting device according to the embodiment is the same as the first or second lighting device, except that the optical processing unit is a reflecting unit, the first light source unit emits light toward the second light source unit, and the reflecting unit reflects light emitted from the first light source unit that does not directly travel toward the second principal surface toward the second principal surface. This makes it difficult to identify the light source position of the first light source unit, reducing the graininess of the light source when viewed from the illumination side. Furthermore, by adjusting the angle of the reflecting surface, the orientation of the light emitted from the first principal surface can be easily adjusted.

[0011] In a fourth lighting device according to the first to third embodiments, the light guide plate has an area through which light emitted from the first light source passes, and the first light source is disposed at a position that does not overlap the area when viewed from a direction perpendicular to the first main surface. This makes it even more difficult to identify the light source position of the first light source, and further reduces the graininess of the light source when viewed from the illumination side.

[0012] A fifth lighting device according to the first to fourth embodiments includes a diffusion processing unit on the first main surface side of the region, which diffuses light that has passed through the region. This makes it even more difficult to identify the light source position of the first light source unit, and further reduces the graininess of the light source when viewed from the illumination side. This diffuses light emitted from the first main surface side of the light guide plate.

[0013] A sixth illumination device according to the first to fifth embodiments is configured such that, in the light guide plate, the region and the end face on which the second light source unit is disposed are spaced apart, and second reflectors are provided on the first principal surface side and the second principal surface side between the region and the end face to reflect light emitted from the second light source unit and emitted from between the region and the end face of the light guide plate toward the light guide plate. This makes it possible to suppress loss of light emitted from the light guide plate between the region and the end face, and to increase luminous efficiency (light extraction efficiency).

[0014] In a seventh lighting device according to the first to sixth lighting devices, the light guide plate has an inclined surface on an end surface opposite to an end surface facing the second light source, the inclined surface inclining toward the second light source from the second main surface toward the first main surface, whereby light propagated within the light guide plate can be directed upward (toward the ceiling) via the inclined surface, thereby reducing glare when the end surface of the light guide plate is viewed from the side opposite the second light source.

[0015] First Embodiment 1. Overall As shown in FIGS. 1 and 2, the lighting device X is a so-called hanging type lighting device (pendant light) that is attached to a mounting surface such as a ceiling via a hanger A. The lighting device X includes a hanger A, a device body B that is removably hung from the hanger A, and a cover C that covers the upper side of the device body B (referred to as a top cover). The device body B has a light source section, a circuit section, etc., and mainly irradiates the side opposite to the mounting surface. Here, the main emission direction of light from the device body B is the vertical direction, with the emission side being the bottom and the anti-emission side being the top. The main emission direction is a direction perpendicular to the main surface of the light guide plate. The vertical direction is the central axis direction along which the central axis of the lighting device X extends, and the direction perpendicular to the central axis is the radial direction. Each part will be explained below.

[0016] 2. Lifting equipment As shown in Figures 1 to 3, the hanging device A comprises a cord 10, a connector 11 provided at the lower end of the cord 10 for detachably connecting to a connector 513 of the device main body B, a hook ceiling 12 provided at the upper end of the cord 10 for detachably connecting to a wiring device (not shown) on the mounting surface, a lower housing 13 provided on the lower side of the cord 10, covering the connector 11 etc. and removably attached to the device main body B, a bush 14 that fits into an upper opening 131 of the lower housing 13 (see Figure 3) and restrains the cord 10, and an upper housing 15 provided on the upper side of the cord 10, covering the hook ceiling 12 etc. and restraining the cord 10. The lower housing 13 has a conical shape, and as shown in Figure 2, the engagement portion 132 extending from the lower end engages with the engagement groove portion 534 of the power supply cover 53 of the device main body B, thereby connecting the hanger A and the device main body B.

[0017] 3. Device body The device main body B includes at least a base 2, a light source unit 3, and a light output unit 4. Here, the device main body B further includes a power supply unit 5 and a bottom cover 6. 7, the base 2 has at least a cover wall 23 having a recessed portion 21 recessed downward, and a peripheral wall 24 extending downward from the periphery of the cover wall 23. That is, the base 2 has an overall covered tubular shape (e.g., a cylindrical shape) with a small vertical dimension. Here, the base 2 has a flange portion 25 extending radially outward from the lower end of the peripheral wall 24. As shown in Figure 3, the device main body B has a power supply unit 5 at the bottom portion 211 of the recessed portion 21 of the base 2, a second light source module 33 on the outer peripheral surface of the cylindrical portion 213 of the recessed portion 21, a first light source module 31 on the inner peripheral surface of the peripheral wall 24, and a light guide plate 41 arranged below the peripheral wall 24 of the base 2 and having a central opening 410 (see Figure 8) that fits into the recessed portion 21 of the base 2. The first light source module 31 is disposed above the light guide plate 41, and light from the first light source module 31 is mainly reflected by the inner surface of the lid portion 22 of the lid wall 23 of the base 2 and emitted after passing through a region (referred to as a passing region) 411 of the light guide plate 41. In this case, the upper surface of the passing region 411 serves as the entrance surface for the first light source module 31, and the lower surface serves as the exit surface. The second light source module 33 is disposed on (the periphery of) the end face that forms the opening 410 of the light guide plate 41. Light from the second light source module 33 mainly enters the end face of the light guide plate 41 (incident face 412 of the light guide plate 41 (see FIG. 10(b))) and propagates inside the light guide plate 41, and is emitted to the outside of the light guide plate 41 from a lower exit face 418 and an upper exit face 417 of the light guide plate 41, as shown in FIG. 3 . For convenience, the incident face of the end face will be referred to as the "end incident face," the lower exit face will be referred to as the "lower exit face," and the upper exit face will be referred to as the "upper exit face." The exit faces 417 and 418 are also exit faces for part of the light from the first light source module 31 that propagates inside the light guide plate 41. The device body B includes a light emitting ring 43 below the lower emission surface 418 of the light guide plate 41, an upper reflector 47 above the light guide plate 41 near the opening 410, and a lower reflector 45 below the light guide plate 41. The device body B includes an inner cover 61 that is disposed inside the light-emitting ring 42 and covers the recessed portion 21 of the base 2 from below, and an outer cover 63 that is disposed outside the light-emitting ring 42 and covers the light guide plate 41 from below. A top cover C is provided above the light guide plate 41 of the device body, and covers the base 2 in a state where the lower housing 13 of the hanger A is fitted therein. The top cover C corresponds to the lower cover 6 and can also be called an upper cover. This will be explained in detail below.

[0018] (1) Base The following description will be mainly made with reference to FIG. The base 2 is a so-called sheet metal base made of a metal plate. The base 2 has a circular cover wall 23 and a cylindrical peripheral wall 24 . The cover wall 23 has a central recessed portion 21 and a cover portion 22 on the outer circumferential side of the recessed portion 21 .

[0019] The recess 21 mainly forms a space for accommodating the power supply circuit unit 51. The bottom portion 211 of the recess 21 has a plurality of protruding portions 211a that protrude upward to support the power supply circuit unit 51, through holes 211b into which the protrusions 616 (see FIG. 4(a)) of the inner cover 61 fit, and through holes 211c for wiring to supply power to the first light source module 31 and the second light source module 33. Here, the bottom portion 211 is provided with a through hole 211d into which a case 65 (see FIG. 3) for the infrared receiving element 515 fits.

[0020] The lid portion 22 has an annular (for example, circular) ring portion 221 located on the outer periphery side of the recessed portion 21, and a bulging portion 223 bulging upward from the outer periphery of the ring portion 221. The annular portion 221 has screw holes 221a and through holes 221b, 221c, etc. spaced apart in the circumferential direction. The screw holes 221a are for screws 921 (see FIGS. 4 and 9) that fasten the base 2, upper reflector 47, lower reflector 45, and light guide plate 41 from below. The through holes 221b are for screws 912 (see FIGS. 4 and 9) that fasten the power supply cover 53, base 2, and upper reflector 47 from above. The through holes 221c are for positioning the upper reflector 47 to fit into the protrusions 476 of the upper reflector 47 (see FIG. 9). The bulging portion 223 is curved in an upwardly convex arc shape in a cross section (shown in FIG. 3 ) cut along a plane passing through the center of the base 2 and extending in the vertical direction. The curvature is configured to direct light emitted from the first light source module 31 toward (the upper surface of) the passage area 411 of the light guide plate 41. In other words, the inner surface of the bulging portion 223 is a reflecting portion that directs the light of the first light source module 31 toward the incident surface of the passage area 411 of the light guide plate 41, and corresponds to an example of an optical processing portion. The upper surface of the passage area 411 of the light guide plate 41 is the incident surface for the first light source module 31 and is part of the emission surface 417 for the second light source module 33.

[0021] This will be explained using Figure 3. The peripheral wall 24 extends in the vertical direction, and the first light source module 31 is provided on the inner peripheral surface thereof. Therefore, the vertical dimension of the peripheral wall 24 only needs to be equal to or larger than the vertical dimension of the first light source module 31. The flange 25 abuts against a region on the upper surface of the light guide plate 41 that is not the passage region 411. In this case, this is a region on the opposite side of the first light source module 31 from the passage region 411. By having the flange 25 protrude outward in the radial direction, it is possible to prevent light from emitting (leaking) upward from the upper surface portion of the light guide plate 41 that faces the flange 25.

[0022] (2) Light source unit The following description will be mainly made with reference to FIGS. 5 and 6. The light source unit 3 has a first light source module (first light source section) 31 and a second light source module (second light source section) 33. The first light source module 31 has LEDs 311 as a light source and a first substrate 313 on which the plurality of LEDs 311 are mounted. The first substrate 313 is flexible, which allows it to be attached to the cylindrical peripheral wall 24 of the base 2. The first light source module 31 is provided on the peripheral wall 24 and disposed on the upper surface side of the light guide plate 41. The second light source module 33 has LEDs 331 as light sources and a second substrate 333 on which the plurality of LEDs 331 are mounted. The second substrate 333 is flexible, which allows it to be attached to the tube portion 213 of the cylindrical recess 21 of the base 2. The second light source module 33 is provided with the LEDs 331 facing the inner peripheral end face of the light guide plate 41 (see FIG. 10(b)).

[0023] (3) Light emission unit The light output unit 4 includes at least a light guide plate 41. It may also include a light emitting ring 43 for diffusing light that is from the first light source module 31 and / or the second light source module 33 and enters through the lower output surface 418. It may also include reflectors 45, 47 (an example of a second reflecting section) that reflect light that is output from the second light source module 33, propagates through the light guide plate 41, and is output from the light guide plate 41 toward the light guide plate 41. Here, the light output unit 4 includes all of these. The reflector below the light guide plate 41 is referred to as a lower reflector 45, and the reflector above the light guide plate 41 is referred to as an upper reflector 47.

[0024] (3-1) Light guide plate The explanation will be mainly made with reference to FIG. The light guide plate 41 is made of, for example, an acrylic resin, and has a shape that matches the overall shape of the base 2, as shown in FIG. The light guide plate 41 has a passage area 411 (see Figure 3) between the upper reflector 47 and the peripheral wall 24 of the base 2, which allows light from the first light source module 31 to pass through and includes an upper surface (the incident surface for the first light source module 31) and a lower surface (the exit surface for the first light source module 31). Light guide plate 41 has a diffusion structure in which light incident from the end face (end incident surface 412) on the opening 410 side is emitted from lower exit surface 418 and upper exit surface 417. Specifically, upper exit surface 417 has a diffusion structure consisting of a plurality of dots (concave or convex portions). The dots are arranged at equal intervals and the same depth or height. Note that dots may or may not be provided in passage area 411, or may be at different intervals and different depths or heights. When light from the first light source module 31 is made to enter through the upper surface (incident surface for the first light source module 31) of the passage area 411 of the light guide plate 41 and is made to exit through the lower surface (exit surface for the first light source module 31) of the passage area 411, not providing dots in the passage area 411 makes it easier to irradiate the light downward, which can contribute to improving the light extraction efficiency of the first light source module 31. The light guide plate 41 is composed of a main body 413 having an opening 410 in the center. The main body 413 has through holes 413a around the periphery of the opening 410. As shown in FIG. 9 , the through holes 413a are for screws 921, which are inserted through the through holes 455 of the lower reflector 45, the through holes 413a of the light guide plate 41, and the through holes 477 of the upper reflector 47, and are screwed into the screw holes 221a of the base 2. As shown in FIG. 8(b), the outer peripheral end of the main body 413 forms an inclined surface 416b that slopes upward as it approaches the edge in the radial direction. Note that the upper end of the inclined surface 416b forms a surface 416c that slopes upward. In other words, the outer peripheral end surface of the main body 413 is inclined surface 416b on the lower side of the end surface that is perpendicular to the main surface of the main body 413. In this way, the outer peripheral end surface of the main body 413 has the orthogonal surface 416c and the inclined surface 416b. Therefore, light propagated within the light guide plate 41 can be emitted upward (toward the ceiling) via the inclined surface 416b. Note that the end surface here is the surface between the outer peripheral edge of the lower surface and the outer peripheral edge of the upper surface. The orthogonal surface 416c may be omitted. The light guide plate 41 has a downwardly recessed circular opening 410 and a concentric groove 415 on the upper surface of the main body 413 .

[0025] (3-2) Illuminating ring The explanation will be mainly made with reference to FIG. The light-emitting ring 43 is disposed below the passage area 411 of the light guide plate 41. Here, the light-emitting ring 43 is disposed in a state of contact (by design) with or facing the lower emission surface 418 (which is the emission surface for the first light source module 31 and / or the second light source module 33) of the light guide plate 41. The light-emitting ring 43 is made of a translucent resin such as polycarbonate (PC) and is mixed with diffusing particles such as silicone microparticles and PS particles. This diffuses the light passing through the light-emitting ring 43. Also, when viewed from below, it is possible to make it difficult to see the state of the upper side of the light guide plate 41 (it is possible to suppress the graininess of the LEDs 311). The light-emitting ring 43 is an example of a light diffusion processing section. The light emitting ring 43 has an annular shape and is provided so that its center position coincides with the center position of the opening 410 of the light guide plate 41 .

[0026] As shown in Figure 8(d), the light-emitting ring 43 has an annular portion 431 that contacts or is close to the light-guiding plate 41, an inner peripheral portion 432 provided on the inner peripheral side of the annular portion 431, and an outer peripheral portion 433 provided on the outer peripheral side of the annular portion 431. The inner circumferential portion 432 extends downward. The inner circumferential surface of the inner circumferential portion 432 near the center of the light-emitting ring 43 forms a stepped portion 434 with an upper surface 434a close to the center and a lower surface 434b far from the center. The surface forming the stepped portion 434 is parallel to the vertical direction (a direction perpendicular to the main surface of the light guide plate 41). The outer circumferential surface of the inner circumferential portion 432 farther from the center of the light-emitting ring 43 forms an inclined surface that approaches the center as it moves downward. This prevents light passing through the annular portion 431 from being blocked. A notch 435 is provided at the lower end of the inner circumferential portion 432 near the center. The notch 435 serves as a decorative groove. In other words, since the inner circumferential portion 432 is fitted with the inner cover 61, it has the function of preventing unevenness from becoming noticeable if it occurs at the fitting portion due to variations in the molded product.

[0027] The outer peripheral portion 433 extends downward. The outer peripheral surface of the outer peripheral portion 433 far from the center of the light-emitting ring 43 forms a stepped portion 436, with an upper surface 436a close to the center and a lower surface 436b far from the center. The surface forming the stepped portion 436 is parallel to the vertical direction (a direction perpendicular to the main surface of the light guide plate 41). The inner peripheral surface of the outer peripheral portion 433 near the center of the light-emitting ring 43 forms an inclined surface that slopes away from the center as it extends downward. This prevents light passing through the annular portion 431 from being blocked. A notch 437 is provided at the lower end of the outer peripheral portion 433 far from the center. The notch 437 serves as a decorative groove. In other words, since the outer peripheral portion 433 is fitted with the outer cover 63, it has the function of preventing unevenness from becoming noticeable if it occurs at the fitting portion due to variations in the molded product.

[0028] (3-3) Lower reflector The explanation will be mainly made with reference to FIG. The lower reflector 45 is disposed below the lower exit surface 418 of the light guide plate 41 (this is the exit surface for light propagating within the light guide plate 41 of the first light source module 31 and the exit surface for the second light source module 33). Here, the lower reflector 45 is disposed in the region between the light passage region 411 and the end incident surface 412 of the light guide plate 41, and is disposed in a state of contact with (by design) or facing the lower surface of the light guide plate 41. The lower reflector 45 is made of, for example, a light-transmitting resin such as polycarbonate (PC) having high reflectivity, which makes it possible to reduce the amount of light incident on the lower reflector 45. The lower reflector 45 reflects, toward the upper exit surface 417 of the light guide plate 41, light that enters from the end incident surface 412 of the light guide plate 41 and propagates inside (mainly light from the second light source module 33) and that exits from the lower exit surface 418 of the light guide plate 41 before reaching the passage region 411. This prevents light from being emitted from the lower exit surface 418 of the light guide plate 41 in the vicinity of the end incident surface 412 of the light guide plate 41, and makes it easier for light from the second light source module 33 to propagate toward the outer peripheral end of the light guide plate 41, thereby improving the light extraction efficiency. The lower reflector 45 has an annular shape and is provided so that its center position coincides with the center position of the opening 410 of the light guide plate 41 . The light-transmitting area 411 of the light guide plate 41 is spaced apart from the inner peripheral end (inner peripheral end face) facing the opening 410, and the lower reflector 45 is disposed between the light-transmitting area 411 and the inner peripheral end face of the light guide plate 41. In other words, it is disposed inside the light-emitting ring 43.

[0029] 8(e), the lower reflector 45 has an annular portion 451 that is in contact with or close to the light guide plate 41, an inner peripheral portion 452 provided on the inner peripheral side of the annular portion 451, and an outer peripheral portion 453 provided on the outer peripheral side of the annular portion 451. The annular portion 451 has a circular ring shape. The inner periphery 452 extends downward. The lower end portion (extending tip portion) of the inner periphery 452 forms a bent portion 454 that extends toward the center of the lower reflector 45 (FIG. 8(e)). The outer periphery 453 extends downward. Here, it extends in a direction perpendicular to the main surface of the light guide plate 41. Note that, as shown in FIG. 10(b), the lower reflector 45 fits into the opening 438 of the light emitting ring 43 with the outer periphery 453 facing the upper surface 434a of the stepped portion 434 of the light emitting ring 43. The lower reflector 45 has through holes 455 in the annular portion 451 for screws 921 to fix the lower reflector 45 .

[0030] (3-4) Upper reflector 3 and 10, the upper reflector 47 is disposed above the upper exit surface 417 of the light guide plate 41 (this is the exit surface for light propagating within the light guide plate 41 of the first light source module 31 and the exit surface for the second light source module 33). Here, the upper reflector 47 is disposed in the region between the light passage region 411 and the end incident surface 412 of the light guide plate 41, and is disposed in a state of contact with (by design) or facing the upper surface of the light guide plate 41. The upper reflector 47 is made of, for example, a light-transmitting resin such as polycarbonate (PC) with high reflectivity, which can reduce the amount of light incident on the upper reflector 47. The upper reflector 47 reflects, toward the lower exit surface 418 of the light guide plate 41, light that enters from the end incident surface 412 of the light guide plate 41 and propagates inside (mainly light from the second light source module 33) and exits from the upper exit surface 417 of the light guide plate 41 before reaching the passage region 411. This prevents light from being emitted from the upper exit surface 417 of the light guide plate 41 in the vicinity of the end incident surface 412 of the light guide plate 41, and makes it easier for light from the second light source module 33 to propagate toward the outer peripheral end of the light guide plate 41, thereby improving the light extraction efficiency. The upper reflector 47 has an annular shape and is provided so that its center coincides with the center of the opening 410 of the light guide plate 41 . The light guide plate 41 has a passage area 411 spaced apart from the inner circumferential edge (inner circumferential end face) facing the opening 410, and the upper reflector 47 is disposed between the light guide plate 41 having the passage area 411 and the inner circumferential end face.

[0031] The explanation will be mainly made with reference to FIG. 9(b) to 9(d), the upper reflector 47 has an annular portion 471 that is in contact with or close to the light guide plate 41, an inner peripheral portion 472 provided on the inner peripheral side of the annular portion 471, and an outer peripheral portion 473 provided on the outer peripheral side of the annular portion 471. The annular portion 471 has a circular ring shape. Inner peripheral portion 472 extends upward. Outer peripheral portion 473 also extends upward. Outer peripheral portion 473 forms inclined surface 474 that slopes outward in the radial direction as it moves upward. In this case, it is curved in an arc shape. This allows light emitted from light guide plate 41 to be reflected back toward light guide plate 41. The upper reflector 47 has a plurality of screw holes 475 for screws 912 for fixing the power supply cover 53 and the upper reflector 47 to the base 2, positioning protrusions 476 for positioning the upper reflector 47 relative to the base 2, and through holes 477 for screws 921 for fastening the lower reflector 45, the light guide plate 41, the upper reflector 47 and the base 2 together, spaced apart in the circumferential direction. The screw hole 475 and the through hole 477 are provided in a boss formed continuously with the annular portion 471 and at least one of the inner peripheral portion 472 and the outer peripheral portion 473 . The protrusion 476 extends upward and fits into the through-hole 221 c of the base 2 .

[0032] (4) Power supply unit The explanation will be mainly based on FIG. 4(a). The power supply unit 5 receives power from a wiring fixture on the mounting surface via a cord 10 and supplies the generated driving power to the light source unit 3 . The power supply unit 5 includes at least a power supply circuit section 51 and a power supply cover 53 that covers the power supply circuit section 51 .

[0033] Power supply circuit unit 51 has electronic components (not shown) that make up the circuit and power supply board 511 on which these components are mounted, and power supply board 511 has connector 513 that connects to connector 11 (see FIG. 3) of suspender A. Power supply circuit unit 51 also has infrared receiving element 515 on the underside of power supply board 511 that receives infrared information from a remote control or the like. The power supply circuit unit 51 is disposed in the recessed portion 21 of the base 2. Because the base 2 is made of a metal plate, it is fixed to the bottom portion 211 of the recessed portion 21 with screws 913 or the like via an insulating sheet 55. The screws 913 are inserted through the through holes 511a of the power supply board 511 and the through holes 55a of the insulating sheet 55, and further through the through holes 211e of the protruding portion 211a of the base 2, and are screwed into the screw holes 615 in the boss portion of the inner cover 61. In other words, the screws 913 fasten the power supply board 511, the base 2, and the inner cover 61 together.

[0034] 4(b) and (c), the power supply cover 53 has a lid portion 531 and a peripheral wall portion 532, and a recessed portion 533 of the lid portion 531 is used to provide an engagement groove portion 534 with which the engagement portion 132 of the lower housing 13 engages. The recessed portion 533 is recessed in a circular shape (excluding the protruding region) when viewed from above, and has protruding regions 533a that protrude radially inward at intervals in the circumferential direction, and the engagement groove portion 534 is formed by openings in the peripheral wall of the protruding regions 533a. To attach the lower housing 13, the engaging portion 132 of the lower housing 13 is placed between the protruding areas 533a of the recessed portions 533, and then the lower housing 13 is rotated around the central axis of the power supply cover 53, whereby the engaging portion 132 engages with the engaging groove portion 534. In this engaged state, the lower housing 13 is fixed with screws (not shown). In addition, the recessed portion 533 is formed with a through hole 533b for the connector 513. The power supply cover 53 has a flange 535 that projects radially outward from the lower end of the peripheral wall 532, and is fixed to the base 2 with screws 912 so that the flange 535 abuts against the annular portion 221 of the base 2. The through-hole 535a of the flange 535 is for the screw 912, the through-hole 535b is for the screw 921, and the through-hole 535c is for the projection 476 of the upper reflector 47 for positioning.

[0035] (5) Lower cover As shown in FIGS. 2 and 3, the lower cover 6 includes an inner cover 61 disposed inside the light emitting ring 43 and an outer cover 63 disposed outside the light emitting ring 43. As shown in Figure 4(a), the inner cover 61 has a plate-shaped portion 612 having a through hole 611 in the center, an inner flange portion 613 extending upward from the inner peripheral edge of the plate-shaped portion 612, and an outer flange portion 614 extending upward from the outer peripheral edge of the plate-shaped portion 612. The plate-like portion 612 has screw holes 615 for screws 913 for fixing the inner cover 61 to the base 2, and a plurality of protrusions 616 for positioning the inner cover 61 relative to the base 2, spaced apart in the circumferential direction. The protrusion 616 extends upward and fits into the through-hole 211 b of the recess 21 of the base 2 . As shown in FIG. 10(a), the outer flange 614 fits into the gap (groove) between the outer periphery 453 of the lower reflector 45 in the attached state and the inner periphery 432 (lower surface 434b) of the light emitting ring 43.

[0036] 8(a) and 8(c), the outer cover 63 has an annular shape that matches the outer peripheral shape of the light emitting ring 43. The outer cover 63 has an annular main body 631, a groove 632 formed on the upper surface of the main body 631, and a step 633 formed on the inner circumferential surface. The lower surface of the main body 631 forms an inclined surface 634 that slopes upward as it moves radially toward the outer periphery, thereby making it possible to make the outer periphery thinner and improving the design. The stepped portion 633 has a stepped shape with an upper surface 635 close to the center of the outer cover 63 and a lower surface 636 far from the center. The stepped portion 633 is fitted from below into the stepped portion 436 on the outer periphery of the light-emitting ring 43, and is thereby attached to the light guide plate 41.

[0037] 4. Top cover The explanation will be mainly based on FIG. The top cover C has a flat portion 72 having a through-hole 71 for the lower housing 13 at the center, and a peripheral wall portion 73 extending downward from the outer periphery of the flat portion 72. The flat portion 72 has an annular shape. The peripheral wall portion 73 is curved in an upwardly convex arc in a cross section including the vertical direction. As shown in FIG. 3, the lower end of the peripheral wall portion 73 coincides with the outer peripheral edge of the outer cover 63 in the vertical direction. This improves the design. In addition, the exposed surfaces of the light guide plate 41 coincide at the top and bottom, improving the design of the light when turned on. The top cover C has, on the underside of the flat portion 72, a circumferential rib 74 concentric with the center of the through-hole 71 and a radial rib 75 extending radially from the circumferential rib 74. This reinforces the top cover C. The circumferential rib 74 abuts against the power supply cover 53, as shown in FIG. 3.

[0038] 5. Light emission (1) First light source module This will be explained using FIG. Of the light emitted from the LED 311 of the first light source module 31, light that does not directly head toward the upper surface of the light guide plate 41 (the incident surface for the first light source module 31) is reflected toward the light guide plate 41 by the lower surface (reflective surface) 223a of the bulging portion 223 of the base 2 and the outer periphery 473 of the upper reflector 47, passes through the passing area 411 (the upper surface (the incident surface for the first light source module 31) and the lower surface (the exit surface (also the lower exit surface) for light propagating within the conductive plate 41 of the first light source module 31))), and is emitted downward from the light-emitting ring 43. In this way, the bulging portion 223 and the outer peripheral portion 473 of the upper reflector 47 are optical processing portions that direct the light of the LEDs 311 toward the light guide plate 41 side. The passing area 411 is bounded on the side closer to the opening 410 of the light guide plate 41 by an imaginary line L1 that passes through the lower end of the outer periphery 473 of the upper reflector 47 and is perpendicular to the light guide plate 41, and on the side farther from the opening 410 of the light guide plate 41 by an imaginary line L2 that passes through the outer periphery 433 of the light-emitting ring 43 and is perpendicular to the light guide plate 41, and is shown by cross-hatching in the figure. The first light source module 31 is disposed on the opposite side of the passing area 411 from the second light source module 33. This allows the upper reflector 47 to be used as an optical processing part. The lower end of the bulging portion 223 and the upper end of the outer periphery 473 of the upper reflector 47 are flush with each other. The curvature of the outer periphery 473 is set in relation to the curvature of the bulging portion 223.

[0039] The LEDs 311 of the first light source module 31 are provided so as not to be located between an inner virtual line L1 and an outer virtual line L2 that define the boundary of the passing region 411. Specifically, the LEDs 311 are provided on the outer side in the radial direction of the lighting device X with respect to the virtual line L2. In other words, when the lighting device X, particularly the area around the light-emitting ring 43, is viewed from the irradiation surface side (the lower side in this example), the LEDs 311 are provided so as not to overlap with the passing region 411. This makes it difficult to see the position of the LEDs 311 that are light sources (making it difficult to identify the light source position) when viewed from the irradiation surface side, and reduces the appearance of grainy light sources. Furthermore, since the light emitting ring 43 having a diffusion function is disposed on the irradiation surface side of the passing area 411, the graininess can be further suppressed. The first light source module 31 is arranged on the outer periphery of the passing area 411. This allows the overall length of the first substrate 313 to be longer than when it is arranged on the inner periphery of the passing area 411, which increases the number of LEDs that can be mounted in one row and increases the amount of light compared to when it is arranged on the inner periphery.

[0040] (2) Second light source module This will be explained using FIG. 10(b). The second light source module 33 is provided with the LEDs 331 facing the end incident surface 412 of the light guide plate 41. This allows most of the light emitted from the LEDs 331 to enter the light guide plate 41 from the end incident surface 412, thereby increasing the light extraction efficiency of the second light source module 33. Reflectors (45, 47) are arranged on at least one of the main surfaces of the light guide plate 41 near the LEDs 331. Here, reflectors (45, 47) are arranged on both main surfaces of the light guide plate 41 (the upper surface (upper emission surface 417 for the second light source module 33) and the lower surface (lower emission surface 418 for the second light source module 33)). The lower reflector 45 and the upper reflector 47 are disposed over substantially the entire area between the light passing area 411 and the end face. The annular portion 471 of the upper reflector 47 and the annular portion 451 of the lower reflector 45 are disposed in contact with or in close proximity to the light guide plate 41. As a result, as shown by the arrows in FIG. 10( b), light emitted from the end incident surface 412 of the light guide plate 41 is reflected by the lower reflector 45 and the upper reflector 47 and enters the light guide plate 41. This prevents light from being emitted from the lower exit surface 418 and the upper exit surface 417 of the light guide plate 41 near the end incident surface 412 of the light guide plate 41, and facilitates propagation of light from the second light source module 33 toward the outer peripheral end of the light guide plate 41, thereby improving the light extraction efficiency.

[0041] (3) Lighting The power supply circuit section 51 is configured to be capable of at least two types of lighting: a first lighting mode in which only the first light source module 31 is turned on, and a second lighting mode in which both the first light source module 31 and the second light source module 33 are turned on. In the first lighting state, the light from the first light source module 31 passes through the passage area 411 of the light guide plate 41 and is emitted downward from the light emitting ring 43. In the second lighting mode, in addition to the light from the first light source module 31, a portion of the light from the second light source module 33 is emitted from the light emitting ring 43. As a result, the light from the first light source module 31 and a portion of the light from the second light source module are combined and emitted from the light emitting ring 43, thereby increasing the amount of light. The power supply circuit unit 51 may be configured to be capable of a third lighting mode in which only the second light source module 33 is turned on. Also, the power supply circuit unit 51 may be configured to be capable of dimming the first light source module 31 and the second light source module 33.

[0042] Although the embodiment has been described above, the present invention is not limited to this embodiment, and the following modifications may be made, for example: Furthermore, the embodiment and the modifications may be combined, or the modifications may be combined with each other. Furthermore, examples not described in the embodiments and modifications, and design changes within the scope of the present invention are also included in the present invention.

[0043] <Modification> 1. Lighting equipment (1) In the embodiment, a hanging type lighting device has been described, but it can also be applied to a ceiling type with a hook blade or a long base type. In the case of the base type, the base can be provided along a long light guide plate, and the first light source unit can be provided on the first main surface side and the second light source unit can be provided on one or both ends of the light guide plate in the short direction. (2) The hanging type lighting device X has a circular shape when viewed from a direction perpendicular to the main surface of the light guide plate, but it may have a polygonal shape with three or more sides, or an elliptical or oblong shape.

[0044] 2. First light source module (first light source unit) (1) The first light source module 31 is provided on the side away from the second light source module 33 with respect to the passage area 411 and faces radially inward, but it may be provided on the side closer to the second light source module 33 and faces radially outward, or it may be provided on both the far side and the near side. When the first light source module 31 is provided on the side closer to the second light source module 33 and faces radially outward, it is desirable that the arc-shaped curved portion convex on the upper side of the bulging portion 223 is inclined so that the radially outer side of the lighting device X (base 2) is lowered. In addition, it is desirable that the lower end of the bulging portion 223 and the upper end of the outer periphery 473 of the upper reflector 47 are flush with each other, and the curvature of the outer periphery 473 is set in relation to the curvature of the bulging portion 223. (2) The first light source module 31 is arranged such that the main emission direction of the LED 311 (the direction perpendicular to the light-emitting layer) is aligned with the upper surface (first main surface) of the light guide plate 41, but the main emission direction may be tilted so as to move closer to or farther away from the light guide plate 41 as it moves away from the LED 311. (3) The first light source module 31 includes the LEDs 311 in a single row, but may include the LEDs 311 in multiple rows. (4) The first light source module 31 is provided on the inner peripheral surface of the peripheral wall 24, but it may also be provided on the outer peripheral surface, with the inner surface of the top cover C configured as a reflective surface. (5) The first light source module 31 may be disposed so that the LED 311 faces the upper surface (incident surface for the first light source module 31) of the passage area 411. Specifically, in the above-described embodiment, an example was given in which the inner surface 223a of the lid portion 22 (bulging portion 223) of the base 2 is curved, but the inner surface 223a of the lid portion 22 (bulging portion 223) of the base 2 is configured to be radially parallel to the upper surface of the passage area 411 (incident surface for the first light source module 31). The first substrate 313 is mounted on this inner surface 223a radially parallel to the upper surface of the passing area 411 (the incident surface for the first light source module 31), and the light-emitting surface of the LED 311 on the first substrate 313 is positioned opposite the upper surface of the passing area 411 (the incident surface for the first light source module 31). It is desirable that the vertical distance between the light-emitting surface of the LED311 and the upper surface of the passing area 411 (the incident surface for the first light source module 31) is such that when the LED311 is viewed from below, the position of the LED311 cannot be identified when the light-emitting ring is attached.

[0045] 3. Second light source module (second light source unit) The LED 331 of the second light source module 33 is arranged so that its center coincides with the center of the light guide plate 41 in the thickness direction, but it may be arranged within a range where a virtual line passing through the center of the LED 331 intersects with the end face of the light guide plate 41.

[0046] 4. Optical processing section In the embodiment, the optical processing section is a reflecting section, more specifically, the inner surface 223a of the lid section 22 (bulging section 223) of the base 2 is used as a reflecting surface, but a reflecting member separate from the base may be provided. The optical processing portion may be a lens portion such as a prism lens, in addition to the reflecting portion.

[0047] 5.Reflector (1) The upper reflector 47 and the lower reflector 45 have the inner peripheral portions 452, 472 and the outer peripheral portions 453, 473, but may be configured with only the annular portions 451, 471. A reflective sheet material may be attached to the light guide plate 41. (2) The outer peripheral portion 473 of the upper reflector 47 may be eliminated, and the annular portion 221 of the lid portion 22 of the base 2 may be in contact with the upper surface of the light guide plate 41, or may be in contact via a reflective sheet. (3) The lower reflector 45 and the upper reflector 47 are arranged between the end face of the light guide plate 41 and the passing area 411, but the distance between the end face and the passing area may be reduced to form a structure without a reflector. (4) The reflector is provided between the end face (412) on the second light source module 33 side and the passage area 411, but it may also be provided on the opposite side of the end face with respect to the passage area 411. [Explanation of symbols]

[0048] A. Lifting equipment B Device body C Top cover X lighting device 2. Bass 3 Light source unit 4 Light emission unit 5 Power Supply Unit 6 Lower cover 31 First light source module (first light source unit) 33 Second light source module (second light source unit) 41 Light guide plate

Claims

1. In an illumination device that emits light from at least a first main surface of a light guide plate, a first light source unit disposed on a second main surface side of the light guide plate opposite to the first main surface; a second light source unit disposed opposite to the end surface of the light guide plate; Equipped with light from the first light source unit is incident on the second main surface side and is emitted from the first main surface, the light from the second light source unit that is incident from the end surface side is propagated within the light guide plate and is emitted from the first main surface side; Lighting equipment.

2. an optical processing section configured to direct light from the first light source section toward the second main surface side of the light guide plate, the optical processing section being disposed on the second main surface side of the light guide plate; The lighting device according to claim 1 .

3. the optical processing portion is a reflecting portion, the first light source unit emits light toward the second light source unit, the reflecting section reflects light emitted from the first light source section that does not directly travel toward the second main surface so as to travel toward the second main surface.

3. The lighting device according to claim 2.

4. the light guide plate has a region through which the light emitted from the first light source passes, When the region is viewed from a direction perpendicular to the first main surface, the first light source unit is disposed at a position that does not overlap the region. The lighting device according to any one of claims 1 to 3.

5. a diffusion processing portion for diffusing light that has passed through the region is provided on the first main surface side of the region; 5. The lighting device according to claim 4.

6. In the light guide plate, the region is spaced apart from an end surface on which the second light source unit is disposed, a second reflecting section that reflects light emitted from the second light source section and emitted from between the region and the end face of the light guide plate toward the light guide plate, the second reflecting section being provided on the first main surface side and the second main surface side between the region and the end face; 5. The lighting device according to claim 4.

7. the light guide plate has an inclined surface on an end surface opposite to an end surface facing the second light source unit, the inclined surface inclining from the second main surface to the first main surface so as to approach the second light source unit; The lighting device according to any one of claims 1 to 3.

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