JP7535977B2 - Lighting fixtures - Google Patents

Description

Patent Law Article 30, Paragraph 2 Applicable May 6, 2021 "Synca2" Catalog (Cover, Pages S14-S15, 18, 47-48, Inside Back Cover (Imprint), Back Cover)

The present invention relates to a lighting fixture that emits light both downward and upward.

In recent years, lighting fixtures equipped with light guide plates have been developed. For example, Patent Document 1 discloses a technology in which a lighting fixture equipped with a light source unit and a light guide unit that guides light from the light source unit and outputs the light toward a first surface side facing downward and a second surface side facing upward, in which an attachment unit that attaches the fixture body to an attachment surface such as a ceiling reflects the light that is output toward the second surface side, diffusing indirect lighting not only directly above the light output surface but also to the surrounding area.

JP 2015-50002 A

However, with the above technology, the light emitted upward is guided by the light guide section and then reflected by the light reflecting section, so it is weaker than the light emitted downward, and the spread of the light may be insufficient. Also, because the light emitted upward and downward has the same light color, there are limitations to the way this lighting fixture can be used to create a light space.

The present invention was made in consideration of these problems, and aims to provide a lighting fixture that can more appropriately control the light intensity than conventional lighting fixtures and can flexibly create a light space.

In order to solve the above problems, the lighting fixture of the present invention is a lighting fixture that is used by being hung from a ceiling, and includes a main body including a frame-shaped portion, a plate-shaped light guide portion arranged so as to be exposed from within the frame of the frame-shaped portion, and a cover portion attached to the upper side of the frame-shaped portion and having a light-transmitting portion, a first light source portion arranged on the frame-shaped portion to emit light toward the side of the light guide portion, and a second light source portion that emits light through the light-transmitting portion toward the ceiling side, and the optical axis of the second light source portion is arranged so as to be inclined with respect to the normal to the light-emitting surface formed by the light-transmitting portion.

The above-mentioned configuration allows the lighting device of the present invention to be made thin by using a light guide section, and by providing a first light source section and a second light source section, the light sources can be controlled separately. Light can be distributed up and down, and the spread of light in the upward direction is ensured, making it possible to provide a lighting device that allows for flexible production of an optical space.

FIG. 1A is a bottom perspective view of a lighting fixture according to one embodiment of the present invention; FIG. 1B is a diagram showing an example of how the lighting fixture can be used by hanging it; and FIG. 1C is a diagram showing another example of how the lighting fixture can be used by connecting the lighting fixtures together and hanging them. FIG. 2A is a plan view of the lighting fixture, FIG. 2B is a schematic diagram showing the lighting fixture as viewed from the front, and FIG. (a) is a schematic diagram showing a cross section of the lighting fixture when viewed from the front with the lighting fixture separated into an upper housing and a lower housing; (b) is a schematic diagram showing a cross section of the lighting fixture when viewed from the front with the upper housing and the lower housing combined; (c) is an enlarged schematic diagram for explaining the function of part P in FIG. 3(b). FIG. 2 is a schematic diagram for explaining electrical connections within the lighting fixture. (a) A schematic diagram for explaining a corner portion of a frame-shaped portion of a lighting fixture; (b) A schematic cross-sectional diagram for explaining a corner portion of a frame-shaped portion of a lighting fixture; (c) A diagram showing a schematic diagram of the state in which the frame-shaped portion of the lighting fixture is separated into multiple frame element portions; (d) A diagram showing a schematic diagram of the appearance of a reinforcing member incorporated into the frame-shaped portion. 1A is a top perspective view showing the appearance of a connecting member, FIG. 1B is a schematic diagram showing the connecting member turned upside down, and FIG. 1C is a schematic diagram for explaining a mode of use of the connecting member. FIG. 2 is a chromaticity diagram of a light source.

1. First embodiment
<1.1. Overview>
Hereinafter, a lighting fixture 1 according to an embodiment of the present invention will be described with reference to the drawings.

Figure 1(a) is a bottom perspective view of a lighting fixture 1 according to one embodiment of the present invention, Figure 1(b) is a diagram showing an example of a usage mode of the lighting fixture 1 in which it is hung from a ceiling, which is an example of an attachment target, and Figure 1(c) is a diagram showing another example of a usage mode of the lighting fixture 1 in which the lighting fixtures 1 are connected together and hung.

Figure 2(a) is a plan view of the lighting fixture 1, Figure 2(b) is a schematic diagram showing the lighting fixture 1 as viewed from the front, and Figure 2(c) is a bottom view of the lighting fixture 1.

In the following explanation, the direction toward the floor when viewed from the ceiling side is referred to as "down" and the direction toward the ceiling when viewed from the floor side is referred to as "up."

The lighting fixture 1 is a lighting fixture that has the function of illuminating downward and upward. As an example, the lighting fixture 1 is a generally plate-shaped lighting fixture with a longitudinal length of 1200 mm, a lateral length of 300 mm, and a height of about 20 mm, as shown in FIG. 1(a). As an example of a usage mode, the lighting fixture 1 is used by hanging it from the ceiling using the hanging fixtures 6a and 6b fixed to the ceiling, as shown in FIG. 1(b). In addition, the lighting fixture 1 can be used by connecting it to the ceiling using the hanging fixtures 6a, 6b, and 6c fixed to the ceiling using a connecting member 610, as shown in FIG. 1(c). As an example of connecting lighting fixtures 1 to each other, one will be described as lighting fixture 1 and the other as lighting fixture 1a for convenience of explanation, but lighting fixture 1a is a lighting fixture with the same configuration as lighting fixture 1.

By connecting multiple lighting fixtures 1 together, it becomes possible to illuminate a wide area in the longitudinal direction.

The slings 6a, 6b, and 6c each have a bifurcated wire portion 7a, wire portion 7b, and wire portion 7c. In FIG. 1(c), the bifurcated portions of the wire portion 7c are labeled as wire portion 7ca and wire portion 7cb, respectively.

Hook-shaped hooks are attached to the tips of wire portion 7a, wire portion 7b, and wire portion 7c. These hook-shaped hooks are hooked onto the hanging parts provided at the four corners of each of lighting fixture 1 and lighting fixture 1a, so that lighting fixture 1 and lighting fixture 1a are suspended from the ceiling.

In the above description, two lighting fixtures 1 are connected together, but three or more lighting fixtures 1 may be connected together and hung from the ceiling in the same manner as in the case of two lighting fixtures. Also, the hanging fixtures 6a to 6c are used to hang the lighting fixtures 1 and 1a by hooking them, but this is not limiting and it is sufficient to attach them to the mounting object, and they may be fixed to the mounting object using screws, etc.

The configuration of lighting fixture 1 is described below.

1.2. Configuration
FIG. 3(a) is a schematic diagram showing a cross section of the lighting fixture as viewed from the front, and FIG. 3(b) is an enlarged schematic diagram for explaining the function of part P in FIG. 3(a).

Figure 4 is a schematic diagram for explaining the electrical connections within the lighting fixture 1.

As shown in FIG. 3(a), the lighting device 1 includes a lower housing 4 that is a flat box shape with a bottom and no lid, and an upper housing 2 that serves as a lid that covers the upper side of the lower housing 4.

<Lower housing 4>
As shown in FIG. 3C , the lower housing 4 includes a frame portion 40 , a light guiding portion 41 , and a first light source portion 48 .

The frame-shaped portion 40 is a frame-shaped member with an L-shaped cross section as shown in FIG. 3(c), which is made up of side plate portions 403 standing up from each of the four outer peripheries of a rectangular annular bottom plate portion 402 having an opening 401. As shown in FIG. 2(c), the frame-shaped portion 40 is made up of a combination of four bar-shaped frame element portions 40a, 40b, 40c, and 40d. The longitudinal ends of the bottom plate portion of each of the frame element portions 40a to 40d are cut at an angle of 45 degrees, and the frame-shaped portion 40 is formed into a frame shape by abutting the respective ends.

As shown in FIG. 3(c), the light guide section 41 is composed of a glare cut panel 42, a diffusion sheet 43, a light guide plate 44, and a reflection sheet 45 stacked from the bottom.

The glare-cutting panel 42 functions as an anti-glare panel, and is made of acrylic, for example, with a corrugated underside as shown in FIG. 3(c). This ensures that when light is emitted through the glare-cutting panel 42, it is possible to reduce glare in the line of sight from below while still ensuring the spread of light, creating a calm atmosphere while still ensuring the brightness necessary for work.

The diffusion sheet 43 has the function of diffusing the incoming light. By appropriately adjusting the degree of diffusion of light by the diffusion sheet 43, it is possible to reduce the color unevenness of the light emitted from the light guide section 41. The thinner and more diffusive the diffusion sheet 43, the more desirable it is. This is because the thinner the sheet is, the thinner the lighting device 1 itself can be. On the other hand, if the degree of diffusion of the diffusion sheet 43 is too low, the light does not reach the center of the lighting device 1, and only the sides close to the light source 411 become bright, and if it is too high, the extraction efficiency decreases, so the diffusion property that emits light uniformly from both sides to the center is necessary. As a result of consideration, the thickness of the diffusion sheet 43 is set to 1.2 mm. Note that the glare cut panel 42 has an uneven surface shape to perform the anti-glare function, and a certain thickness is required, so the diffusion sheet 43 is the component that can be made thin.

The light guide plate 44 is, for example, made of acrylic and is a plate-like member that guides the light introduced from the light source unit 48 and outputs the light in a planar form.

The reflective sheet 45 is a sheet that reflects light, and reflects the light guided by the light guide plate 44 downward to prevent it from leaking upward.

As shown in FIG. 4, the first light source unit 48 includes an LED (Light Emitting Diode) board 410a, an LED board 410b, an LED board 410c, and an LED board 410d.

The LED board 410a is an LED board equipped with multiple light sources 411.

As the light source 411, a single-color light source may be used, but a two-color or three-color light source may be used so that the light and color can be adjusted. For example, if a daylight LED (color temperature 6500K) and a warm white LED (color temperature 2700K) are used as the two-color light source, the color temperature between the two light sources can be reproduced by mixing the two light sources. If a blue-white LED, a yellow-white LED, and a red LED (details will be described later) are used as the three-color light source, each color can be reproduced as a mixture of the three colors, and it is possible to produce colors that follow the black body locus and subtle colors that have a certain color difference from the black body locus. By changing such colors according to the daily schedule, lighting with a high color temperature that promotes human activity during the day and lighting with a low color temperature that relaxes people at night, and adjusting to the daily rhythm of humans, it contributes to promoting human health. In addition, the color of the blue sky and the color of the sunset can be projected onto the ceiling and walls, allowing you to enjoy a lighting environment as if you were outdoors while indoors.

The LED board 410a is equipped with a blue-white LED 411B, a yellow-white LED 411Y, and a red LED 411R as examples of light sources 411.

LED board 410b, LED board 410c, and LED board 410d have the same configuration as LED board 410a.

The LED boards 410a and 410b are arranged in a straight line and attached to the inner surface of the side plate portion 403 of the frame element portion 40b so as to face the side of the light guide plate 44, as shown in FIG. 3(c). Similarly, the LED boards 410c and 410d are arranged in a straight line and attached to the inner surface of the side plate portion 403 of the frame element portion 40d so as to face the light guide plate 44.

As an example, the light emitted from the light source 411 passes through the light guide plate 44, is reflected by the reflecting sheet 45, and is diffused by the diffusing sheet 43, as shown as light path L1 in FIG. 3(c), and is emitted from the lower surface of the glare-cutting panel 42.

The thickness of the light guide plate 44 is preferably thin in that it is lighter, but is determined so that as much light emitted from the light source 411 passes through the light guide plate 44 as possible to ensure as much brightness as possible. It is also desirable to determine the thickness taking into consideration the distance between the light source 411 and the side of the light guide plate 44. Here, the thickness of the light guide plate 44 is set to 4 mm. The distance between the light source 411 and the side of the light guide plate 44 is set to 1.5 mm, but it may be between 0.1 mm and 3.0 mm.

The thickness of the light guide plate 44 is preferably thin in that it is lighter, so a prototype with a thickness of 3 mm was also produced, but the light emitted from the light source 411 often did not pass through the light guide plate 44, resulting in insufficient brightness, so a thickness of 4 mm was used. The thickness of the light guide plate 44 is determined by the size of the LED. If the LED size is 2.8 mm x 3.5 mm and the thickness is 2.8 mm, the thickness of the light guide plate 44 should preferably be 3.5 mm to 4.5 mm. If the LED size is 3.0 mm x 1.4 mm and the LED is to be used in a horizontally long arrangement, the thickness of the light guide plate should preferably be thinner, at 2.0 mm to 3.0 mm.

<Upper housing 2>
The upper housing 2 includes an upper cover portion 21 , a light emitting portion 23 a , a light emitting portion 23 b , a power supply portion 25 , a hanging portion 27 , a feed wiring 28 , a power cable 29 , and a pressing member 31 .

The top cover 21 includes a top panel 211, a power supply cover 213, a plastic panel 215a, a plastic panel 215b, a plastic panel 215c, and a plastic panel 215d.

The top plate 211 is a flat member with multiple openings.

The resin panels 215a, 215b, 215c, and 215d are thin milky white panels made of translucent resin and function as translucent parts. As shown in FIG. 2(a), they are arranged to cover the four openings located on the left and right of the central opening of the upper plate 211. These four openings are openings for passing light emitted by the light emitting unit 23a and the light emitting unit 23b, respectively. The reinforcing part 30a is arranged between the openings in which the resin panels 215a and 215b of the upper plate 211 are arranged. If the openings in which the resin panels 215a and 215b are arranged were to be connected, the opening would be too long in the longitudinal direction and would lack strength, so the opening is divided into multiple small openings to reinforce it. The reinforcing part 30b is similar to the reinforcing part 30a.

The power supply cover 213 is a member having a substantially U-shaped cross section, and as shown in Figures 2(a) and 2(b), is arranged to cover the central opening of the top plate 211 and has the function of covering the power supply unit 25.

As shown in Figures 3(a) to 3(c), the light-emitting unit 23a is attached to the underside of the opening in the upper plate 211 into which the resin panel 215a is fitted, and emits light upward.

As shown in FIG. 3(c), the light-emitting unit 23a includes a light source box 231, a light source stand 232, and a second light source unit 233.

The light source box 231 is a box-shaped member without a lid, and stores the light source stand 232 and the second light source unit 233. The light source box 231 also has the function of pressing down on the light guide unit 41 from above, more firmly fixing the position of the light guide unit 41.

The light source stand 232 includes a base portion 232a on which the second light source unit 233 is placed, and a support portion 232b that supports the base portion 232a.

The base portion 232a is inclined outward in a plan view of the lighting fixture 1 with respect to the light emission surface of the resin panel 215a, which serves as the light emission surface for the light emitted by the second light source portion 233, so that the angle between the normal to that surface and the optical axis of the second light source portion 233 is 10 degrees or more and 30 degrees or less.

The second light source unit 233 includes an LED board 233a and an LED board 233b. As shown in FIG. 4, the LED board 233a and the LED board 233b are LED boards each including a plurality of light sources 234.

Light source 234 may be a single-color light source, or may be a two- or three-color light source so that the light and color can be adjusted. Here, light source 234 is the same light source as light source 411.

As described above, the optical axis of the light source 234 is tilted toward the outside of the lighting fixture 1 in a planar view at an angle of 10 degrees to 30 degrees with respect to the normal to the light output surface, so that the area directly above the lighting fixture 1 is also illuminated, as shown as the emission range L11 in FIG. 3(c) as an example, and the outside of the lighting fixture 1 can be illuminated more strongly and over a wider area.

Light-emitting unit 23b has a similar configuration to light-emitting unit 23a and is arranged symmetrically with respect to power supply unit 25.

The power supply unit 25 is a power supply unit that supplies power to the light sources 234 of the light-emitting units 23a and 23b. A feed wiring 28 and a power cable 29 are connected to the power supply unit 25. The power supply unit 25 is composed of two or more power supply devices. Each power supply device controls the operation of the first light source unit 48 and the second light source unit 233 separately. Note that it is sufficient for the power supply unit 25 to be able to control the operation of the first light source unit 48 and the second light source unit 233 separately, and it may be composed of a single power supply device.

The power supply unit 25 can also be fitted with a wireless module, which is a small device for wireless control. The wireless module wirelessly receives control signals for dimming, color adjustment, etc., and outputs them to the power supply unit 25, and the power supply unit 25 controls the first light source unit 48 and the second light source unit 233, such as dimming and color adjustment, in response to the control signals. There may be one wireless module, or multiple wireless modules may be used depending on the content of the control to be performed.

The power cable 29 is a cable for supplying power from an external source to the power supply unit 25 of the lighting fixture 1.

The feed wiring 28 is a wiring that branches off from the power cable 29 to supply the power supplied to the power supply unit 25 to other lighting fixtures.

The hanging parts 27 are configured to hook onto the hooks at the ends of the bifurcated wire parts of the wire parts 7a to 7c of the slings 6a to 6c, and are arranged at the four corners of the lighting fixture 1 as shown in Figure 2(a).

As shown in FIG. 3(a), the pressing member 31 is a plate-shaped member made of a metal material and is bent into an L-shaped cross section. The pressing member 31 has the function of pressing down the light guide section 41 from above, sandwiching it between the pressing member 31 and the bottom plate section 402 of the frame section 40, and fixing the position of the light guide section 41.

<1.3. Details and Assembly of the Frame Part 40 of the Lower Housing 4>
5(c), one of the corners of the frame-shaped portion 40 is aligned with an inclined end 405a of the frame element portion 40a and an inclined end 405b of the frame element portion 40b so that a corner 406a of the end 405a contacts a corner 406b of the end 405b, and then welded and fixed. The same applies to the other corners of the frame-shaped portion 40.

In the following, the portion of the bottom plate 402 provided on the frame element 40a is referred to as the bottom plate 402a, and the portion of the side plate 403 provided on the frame element 40a is referred to as the side plate 403a. As in the case of the bottom plate 402a and the side plate 403a, the portions of the bottom plate 402 provided on the frame element 40b, the frame element 40c, and the frame element 40d are referred to as the bottom plate 402b, the bottom plate 402c, and the bottom plate 402d, respectively, and the portions of the side plate 403 provided on the frame element 40b, the frame element 40c, and the frame element 40d are referred to as the side plate 403b, the side plate 403c, and the side plate 403d.

For the above-mentioned welding fixation, a rectangular column-shaped reinforcing member 433 bent at a right angle as shown in FIG. 5(d) is provided at each of the four corners of the frame-shaped portion 40. The reinforcing member 433 has four screw holes 436 on the top surface and two screw holes 435 on the side surface.

Inside the side plate 403a of the frame element 40a, an inner wall 441a is provided, standing on the bottom plate 402a, so that the distance between the side plate 403a and the inner wall 441a is approximately the same as the width of the reinforcing member 433. Similarly to the inner wall 441a, inner walls 441b, 441c, and 441b are provided on the inner side of the side plate 403b of the frame element 40b, the inner side of the side plate 403c of the frame element 40c, and the inner side of the side plate 403d of the frame element 40d, respectively.

Then, prior to welding the frame element parts 40a and 40b, as shown in Figs. 5(a) and 5(b), the reinforcing member 433 is sandwiched between the side plate part 403a of the frame element part 40a and the inner wall part 441a arranged on the inside thereof, and between the side plate part 403b of the frame element part 40b and the inner wall part 441b arranged on the inside thereof. Next, the frame element parts 40a and 40b are temporarily fixed by screwing them to the frame element parts 40a and 40b using the screws 434a and 434b.

In this temporary fixing state, the worker fine-tunes the alignment of the inclined end 405a of frame element part 40a and the inclined end 405b of frame element part 40b so that corners 406a and 406b come into contact. The worker then welds and fixes frame element part 40a and frame element part 40b together. This allows frame element part 40a and frame element part 40b to be fixed without misalignment.

The welding between frame element portion 40b and frame element portion 40c, the welding between frame element portion 40c and frame element portion 40d, and the welding between frame element portion 40d and frame element portion 40a are similar to the welding between frame element portion 40a and frame element portion 40b.

The screw holes 436 are used to fasten the top cover 21 to the reinforcing member 433 using the screws 452, i.e., to fasten the upper housing 2 and the lower housing 4, as shown in FIG. 5(b).

<1.4. Connection of multiple lighting fixtures 1>
Figure 6(a) is an upper oblique view showing the appearance of a connecting member 610 for connecting multiple lighting fixtures 1 together, Figure 6(b) is a diagram for explaining the configuration of the connecting member 610 as viewed from below, and Figure 6(c) is a schematic diagram for explaining how the connecting member 610 is used.

In the following, as an example of connecting lighting fixtures 1 to each other, for convenience of explanation, one will be described as lighting fixture 1 and the other as lighting fixture 1a having the same configuration as lighting fixture 1.

As shown in FIG. 6(a), the connecting member 610 includes a wiring cover portion 611, a main body portion 612, a suspender support portion 613, and a suspender support portion 614.

The wiring cover section 611 is a U-shaped cross-section member that is made by bending and cutting a plate-like member such as a metal, and when the lighting fixture 1 and the lighting fixture 1a are connected using the connecting member 610, the wiring that electrically connects the lighting fixture 1 and the lighting fixture 1a passes through the inside of the wiring cover section 611, thereby covering and protecting the wiring so that it cannot be seen from the outside.

The main body 612 is formed by bending a plate-like member such as a metal and processing it by cutting. The main body 612 has a groove 621 along the longitudinal direction at the center of the short side. As shown in FIG. 6(c), when the lighting fixture 1 and the lighting fixture 1a are connected using the connecting member 610, the groove 621 is located between the side wall of the lighting fixture 1 and the side wall of the lighting fixture 1a and has the function of keeping the distance constant. In the connected state, the bottom surface of the groove 621 is located above the bottom surfaces of the lighting fixture 1 and the lighting fixture 1a and is difficult to see from below, so the design is not impaired. In addition, the hanging tool support part 613 and the hanging tool support part 614 are arranged at both ends of the main body 612 in the longitudinal direction, respectively.

The sling support parts 613 and 614 are configured to hook onto the hooks provided at the ends of the bifurcated wire parts (wire parts 7ca and 7cb, for example) of the wire parts 7a to 7c of the slings 6a to 6c, and when hooked, the tip of the hook fits within the groove part 621.

3. Modifications
Although the embodiment of the lighting device according to the present invention has been described above, the description of the above embodiment is in all respects illustrative and should not be considered as restrictive. The scope of the present invention is indicated by the claims, not by the above embodiment. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the claims. The exemplified lighting device can be modified as follows, and the present invention is of course not limited to the lighting device as shown in the above embodiment.

(1) As the blue-white LED, yellow-white LED, and red LED given as examples of the three-color LED, the colors shown in the CIE 1931 chromaticity coordinate diagram shown in FIG. 7 can be suitably used. The dotted line is the blackbody locus. The red LED emits light with a chromaticity in the range surrounded by the chromaticity boundary line E, including (0.66 , 0.23), (0.423 , 0.355), and (0.5, 0.5), in the chromaticity coordinates of FIG. 12, and is (0.60 , 0.38) as an example. The yellow-white LED Yw emits light with a chromaticity in the range surrounded by the chromaticity boundary line E, including (0.5, 0.5) , (0.423, 0.355), (0.342, 0.312), (0.352 , 0.44), (0.37 , 0.63), and is (0.44 , 0.47) as an example. A bluish-white LED, Bw, emits light with a chromaticity in the range enclosed by (0.336 , 0.24), (0.352 , 0.44), (0.15 , 0.2), and (0.2 , 0.1), an example being (0.23 , 0.26).

(2) As the three-color LED, the three primary colors of blue, green, and red may be used. Note that a primary color is a color that is close to the chromaticity boundary line on the chromaticity coordinates. In this case, the range of colors that can be reproduced is wider than the combination of blue-white, yellow-white, and red. However, the total luminous flux efficiency (lm/W) relative to power consumption is higher for the combination of blue-white, yellow-white, and red.

(3) In the above embodiment, an LED is used as the light source, but this is not limiting and other light sources may be used. For example, an organic EL or organic LED (Organic Electroluminescence or Organic Light Emitting Diode), a field emission display, etc. may be used.

(4) The above-described embodiments and variations may be partially combined.

4. Extraction of inventions
The configuration of a lighting fixture according to one embodiment of the present invention, as well as modifications and effects thereof, will be described below.

(1) A lighting fixture according to one embodiment of the present invention is a lighting fixture that is used by being hung from a ceiling, and includes a main body including a frame-shaped portion, a plate-shaped light guide portion arranged so as to be exposed from within the frame of the frame-shaped portion, and a cover portion attached to the upper side of the frame-shaped portion and having a light-transmitting portion, a first light source portion arranged on the frame-shaped portion to emit light toward a side surface of the light guide portion, and a second light source portion that emits light through the light-transmitting portion toward the ceiling side, and the optical axis of the second light source portion is arranged so as to be inclined with respect to the normal to the light-emitting surface formed by the light-transmitting portion.

This configuration allows for a lighting fixture that can be made thinner by using a light guide section, and that can control the light sources separately by providing a first light source section and a second light source section, can distribute light both upward and downward, and ensures the spread of light in the upward direction, allowing for flexible production of an optical space.

(2) The angle between the normal and the optical axis may be greater than or equal to 10 degrees and less than or equal to 30 degrees.

This configuration ensures brightness in the upward direction and spread of light.

(3) The moving part may also include a light guide plate above the glare-cutting panel.

This configuration ensures the light spreads while reducing glare in the direction of the line of sight from below, creating a calm atmosphere while still providing the brightness necessary for work.

(4) The thickness of the light guide plate may be 4 mm or more.

With this configuration, brightness can be ensured by allowing a large amount of light emitted from the first light source unit to pass through the light guide unit.

(5) The light guide section may include a diffusion sheet between the glare cut panel and the light guide plate.

This configuration allows the degree of light diffusion to be appropriately adjusted to reduce color unevenness in the light emitted from the light guide.

(6) The light guide may include a reflective sheet on the light guide plate.

This configuration prevents the light guided by the light guide section from leaking upwards and reflects it downwards, ensuring more downward light.

(7) The second light source unit may be housed in a light source box, and the light source box may press down on the reflective sheet from above.

This configuration allows the position of the light guide to be fixed more firmly.

(8) The corners of the frame may be reinforced with reinforcing members in the shape of rectangular columns.

(9) The corners of the frame-shaped portion are formed by butting together the ends of two rod-shaped frame element portions having diagonally cut ends, and the two frame element portions may be aligned with the reinforcing member and then welded.

This configuration allows the frame-shaped portion to be formed so that the frame element portion does not shift position.

(10) The translucent portion may be divided into a plurality of regions by reinforcing portions.

This configuration enhances the longitudinal strength of the lighting fixture.

LIST OF SYMBOLS 1, 1a Lighting fixture 2 Upper housing 4 Lower housing 6a, 6b, 6c Hanging fixture 7a, 7b, 7c, 7ca, 7cb Wire portion 21 Upper cover portion 23a, 23b Light-emitting portion 25 Power supply portion 27 Suspended portion 28 Feed wiring 29 Power cable 30a, 30b Reinforcement portion 31 Retaining member 40 Frame portion 40a, 40b, 40c, 40d Frame element portion 41 Light-guiding portion 42 Glare-cutting panel 43 Diffusion sheet 44 Light-guiding plate 45 Reflection sheet 48 First light source portion 48 Light source portion 211 Top panel 213 Power supply cover 215a, 215b, 215c, 215d Resin panel 231 Light source box 232 Light source stand 232a Base portion 232b Support part 233 Second light source part 233a, 233b, 410a, 410b, 410c, 410d LED board 234 Light source 401 Opening part 402, 402a, 402b, 402c, 402d Bottom plate part 403, 403a, 403b, 403c, 403d Side plate part 405a, 405b End 406a, 406b Corner 411 Light source 433 Reinforcement member 434a, 434b, 452 Screw 435, 436 Screw hole 441a, 441b, 441c Inner wall 610 Connection member 611 Wiring cover 612 Main body 613, 614 Hanging tool support 621 Groove

Claims (10)

A lighting fixture that can be suspended from a ceiling,
The lighting fixture is generally plate-shaped,
A main body portion including a frame-shaped portion, a plate-shaped light guide portion arranged so as to be exposed from within the frame of the frame-shaped portion, and a lid portion attached to an upper side of the frame-shaped portion and including a light transmitting portion;
a first light source unit disposed in the frame portion so as to emit light toward a side surface of the light guide unit;
a second light source unit that emits light through the light transmitting unit toward the ceiling side,
the second light source unit is disposed inwardly of the first light source unit in a planar view, and an optical axis of the second light source unit passes through a light output surface defined by the light-transmitting unit and is tilted outwardly in a planar view of the lighting device with respect to a normal to the light output surface. The lighting device according to claim 1 , wherein an angle between the normal line and the optical axis is equal to or greater than 10 degrees and equal to or less than 30 degrees. The lighting fixture according to claim 1 , wherein the light guide portion comprises a light guide plate on an upper side of a glare-cutting panel. The lighting device according to claim 3 , wherein the light guide plate has a thickness of 4 mm or more. The lighting device according to claim 3 , wherein the light guide portion includes a diffusion sheet between the glare cut panel and the light guide plate. The lighting device according to claim 3 , wherein the light guide portion includes a reflective sheet on the light guide plate. The lighting fixture according to claim 6 , wherein the second light source unit is accommodated in a light source box, and the light source box presses down on the reflective sheet from above. The lighting fixture according to claim 1 , wherein the corners of the frame portion are reinforced by reinforcing members in the form of rectangular columns bent at right angles. The corner portion of the frame-shaped portion is formed by butting together ends of two rod-shaped frame element portions, the ends of which are cut obliquely,
The lighting fixture according to claim 8 , wherein the two frame element parts are aligned with the reinforcing member and then welded together. The lighting device according to claim 1 , wherein the light-transmitting portion is separated by a reinforcing portion.