Lighting fixture

Abstract

To provide a lighting apparatus capable of suppressing deterioration of sky reproducibility even when used for a long time.SOLUTION: A lighting apparatus includes a blue LED module having a white LED, a blue LED, and a green LED, a light guide plate that diffuses the light of the blue LED module and emits surface light, and a control device that controls the blue LED module to reproduce the color of the sky, and the control unit is configured to individually correct the outputs to the white, blue, and green LEDs on the basis of deterioration information and a usage time of the light guide plate.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present disclosure relates to a lighting fixture including an LED (Light Emitting Diode).

Background Art

[0002] Conventionally, lighting fixtures capable of reproducing the appearance of the sky have been proposed. For example, in the lighting fixture described in Patent Document 1, a light emitting module having a plurality of color LEDs is used to control the emission of blue light, yellow light, orange light, red light, and white light, thereby reproducing the appearance of the sky.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the lighting fixture described in Patent Document 1, the emission of blue light, yellow light, orange light, red light, and white light is controlled to project natural skies such as a clear sky, a cloudy sky, and a sunset sky onto a light diffusing plate. Here, when the lighting fixture is used for a long time, the light diffusing plate deteriorates due to temperature load or the like, and the reproducibility of the sky in the lighting fixture decreases.

[0005] The present disclosure solves the above-described problems, and an object thereof is to provide a lighting fixture capable of suppressing a decrease in the reproducibility of the sky even when used for a long time.

Means for Solving the Problems

[0006] The lighting fixture according to the present disclosure includes a blue LED module having a white LED, a blue LED, and a green LED, a light guide plate that diffuses the light of the blue LED module to emit surface light, and a control unit that controls the blue LED module to reproduce the color of the sky. The control unit, based on the deterioration information and usage time of the light guide plate, Set a first correction rate for correcting the output to the white LED, a second correction rate for correcting the output to the blue LED, and a third correction rate for correcting the output to the green LED, correct the output to the white LED using the first correction rate, correct the output to the blue LED using the second correction rate, and correct the output to the green LED using the third correction rate is such.

Effects of the Invention

[0007] According to the lighting fixture of the present disclosure, by individually correcting the outputs to the white LED, the blue LED, and the green LED based on the deterioration information and usage time of the light guide plate, it is possible to suppress a decrease in the reproducibility of the sky even when used for a long time.

Brief Description of the Drawings

[0008]

Figure 1

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Figure 17

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the lighting fixture will be described with reference to the drawings. The lighting fixture of the present disclosure is not limited to the following embodiments and can be variously modified. Also, the lighting fixture of the present disclosure includes all combinations of configurations that can be combined among the configurations shown in the following embodiments. In each figure, those with the same reference numerals are the same or corresponding thereto, which is common throughout the specification. Also, throughout the specification, the vertical direction from the floor surface to the ceiling will be referred to as the "upward direction", and the ceiling side will be referred to as the "upper side". Similarly, the vertical direction from the ceiling to the floor surface will be referred to as the "downward direction", and the floor surface side will be referred to as the "lower side". Note that in each drawing, the relative dimensional relationships or shapes of the respective constituent members may be different from the actual ones.

[0010] Embodiment 1. FIG. 1 is a perspective view showing the appearance of the lighting fixture 1 according to Embodiment 1. The lighting fixture 1 is a ceiling-embedded type lighting fixture, and includes a fixture body 50 embedded in the ceiling and a light source unit 10 attached to the fixture body 50. The light source unit 10 includes a diffusion cover 13 that emits white light and a light guide plate 17 that emits blue light. The lighting fixture 1 can provide lighting having a visual effect with a sense of depth as if looking through a window frame at the sky by the blue light from the light guide plate 17 and the white light from the diffusion cover 13.

[0011] FIG. 2 is an exploded perspective view showing the configuration of the lighting fixture 1 according to Embodiment 1. The lighting fixture 1 is installed by being embedded in an embedding hole H provided in the ceiling C. As shown in FIG. 2, the fixture body 50 of the lighting fixture 1 is formed in a rectangular box shape and has an open bottom side. The fixture body 50 has a main surface 51 and four side surfaces 52. Each of the side surfaces 52 is provided so as to vertically extend downward from each of the four sides of the main surface 51.

[0012] Among the four side surfaces 52 of the fixture body 50, V-spring mounting brackets 53 are attached to the inner surfaces of two opposing side surfaces 52. The V-spring mounting brackets 53 hook and hold a V-spring 12 (described later) provided on the light source unit 10. Further, bolt holes 51-1 are provided at the four corners of the main surface 51. Also, a suspension bolt B is suspended from the embedding hole H in the ceiling C. The fixture body 50 is fixed to the ceiling C by inserting the suspension bolt B into the bolt hole 51-1 and then tightening the suspension bolt B with a nut 61.

[0013] Further, a wire hole 51-2 is formed in the main surface 51 and a terminal block 54 is provided. The terminal block 54 has a power supply terminal block and a signal line terminal block. In FIG. 2, the power supply terminal block and the signal line terminal block are not shown. A wire and a signal line are drawn out from the wire hole 51-2. The wire drawn out from the wire hole 51-2 is electrically connected to the power supply terminal block of the terminal block 54. Also, the signal line drawn out from the wire hole 51-2 is electrically connected to the signal line terminal block of the terminal block 54.

[0014] The light source unit 10 is disposed inside the opening of the fixture main body 50. The light source unit 10 includes an upper cover 27, a flange portion 11, a V spring 12, a diffusion cover 13, and a light guide plate 17. The upper cover 27 is formed in a frustum of a square pyramid with an open lower end. Each of the four side surfaces of the upper cover 27 is formed in a trapezoidal shape, and the length of the upper side is shorter than the length of the lower side. The flange portion 11 is formed in a rectangular frame shape in plan view. As shown in FIG. 2, the flange portion 11 is disposed so as to protrude outward in the horizontal direction from the lower end of the upper cover 27.

[0015] The V spring 12 is a wire spring formed by bending a metal wire into a V shape, and is attached to the upper surface of the flange portion 11. A total of four V springs 12 are provided in accordance with the positions of the V spring mounting brackets 53 of the fixture main body 50. When the V spring 12 engages with the V spring mounting bracket 53, the light source unit 10 is suspended and held by the fixture main body 50. When the lighting fixture 1 is attached to the embedding hole H in the ceiling C, the flange portion 11 covers the edge of the embedding hole H. Therefore, when the lighting fixture 1 is attached to the embedding hole H in the ceiling C, the embedding hole H is not visible to the user.

[0016] FIGS. 3 and 4 are exploded perspective views showing the configuration of the light source unit 10 of the lighting fixture 1 according to the first embodiment. The light source unit 10 is composed of the components shown in FIG. 3 and the components shown in FIG. 4. FIG. 3 shows the components provided in the lower part of the light source unit 10, and FIG. 4 shows the components provided in the upper part of the light source unit 10.

[0017] Among the components of the light source unit 10, first, the components shown in FIG. 3 will be described. As shown in FIG. 3, the light source unit 10 includes a flange portion 11, a V spring 12, a packing 21, a diffusion cover 13, a packing 22, a white LED module 14, and a module holding portion 15.

[0018] As described above, the flange portion 11 is formed in a rectangular frame shape. The flange portion 11 is made of, for example, metal. A total of four V-springs 12 are provided on the upper surface of the flange portion 11.

[0019] The module holding portion 15 is formed in a rectangular frame shape in plan view. The module holding portion 15 is composed of four members combined. Each of the four members has an L-shaped cross section as shown in FIG. 5 described later. Also, as shown in FIG. 3, mounting flanges 15-1 are provided at the lower ends of each of the four members of the module holding portion 15. The mounting flanges 15-1 are attached to the flange portion 11 by screws.

[0020] The white LED module 14 has three substrates 140 and two types of white LEDs 141 and 142 with different color temperatures provided inside each of the three substrates 140. The three substrates 140 of the white LED module 14 are arranged in a U-shape in plan view so as to form three sides of a rectangle. The angle formed between adjacent substrates 140 is 90°. The white LED module 14 emits white light from three directions that form a U-shape.

[0021] The white LED 141 is, for example, a daylight LED with a color temperature of 4000 - 5000 (K), and the white LED 142 is, for example, a bulb-color LED with a color temperature of 2600 - 3000 (K). The white LED module 14 can emit white light with various color temperatures and various light amounts by changing the dimming rates of the white LEDs 141 and 142. Also, the white LED 141 and the white LED 142 may be dimmed according to the time. For example, the white LED 141 and the white LED 142 are dimmed so that the light amount is 100% during the day, 50% at dawn and dusk, and 20% at night. Furthermore, the white LED 141 and the white LED 142 are dimmed so that, for example, the color temperature is 4500K of daylight white during the day, the color temperature is 3000 - 3500K of bulb color at dusk, and the color temperature is 4000 - 3800K at night.

[0022] Note that, as the light source of the white LED module 14, a light-emitting element or a light-emitting device other than an LED may be used. Further, the white LED module 14 may include only one type of white LED, or may include three or more types of white LEDs. The white LED module 14 is disposed inside the module holding portion 15 and is held by the module holding portion 15.

[0023] The packing 22 is formed in a rectangular thin frame shape in plan view. The packing 22 is disposed between the upper end surface of the diffusion cover 13 and the lower surface which is the light-emitting surface of the light guide plate 17 shown in FIG. 4. The packing 22 shields light so that the light emitted from the blue LED module 18 described later does not enter from the light-emitting surface of the light guide plate 17 to the upper end surface of the diffusion cover 13. Further, the packing 22 shields light so that the white light emitted from the white LED module 14 does not enter from the upper end surface of the diffusion cover 13 to the light-emitting surface of the light guide plate 17. Furthermore, the packing 22 also functions as a cushioning material when the lighting fixture 1 shakes due to an earthquake or the like.

[0024] The diffusion cover 13 is made of, for example, a white resin and is formed in a rectangular frame shape in plan view. The diffusion cover 13 has a frustum of a square pyramid shape with openings on the upper and lower sides. That is, each of the four side surfaces of the diffusion cover 13 is inclined at a preset angle with respect to the vertical direction. Each of the four side surfaces of the diffusion cover 13 is composed of a trapezoidal diffusion plate, and the length of the upper side is shorter than the length of the lower side. Further, since each of the four side surfaces of the diffusion cover 13 is inclined, in plan view, it is arranged so that the position of the upper side is inside the position of the lower side. Thereby, the internal space of the diffusion cover 13 becomes larger in a tapered shape downward. The diffusion cover 13 may be formed by combining four trapezoidal diffusion plates, or may be formed by integral molding.

[0025] Of the four sides of the diffusion cover 13, three sides are light-emitting surfaces 13-1, and the other one side is a non-light-emitting surface 13-2. The three light-emitting surfaces 13-1 are arranged in a U shape. Here, on each of the four sides of the diffusion cover 13, the inner surface facing the inner space of the diffusion cover 13 is called the front surface, and the outer surface is called the back surface.

[0026] The diffusion cover 13 is arranged inside the white LED module 14. That is, the white LED module 14 is arranged on the back side of each of the light-emitting surfaces 13-1 of the diffusion cover 13. The white light emitted from the white LED module 14 enters from the back of the light-emitting surface 13-1 of the diffusion cover 13, passes through the light-emitting surface 13-1, and is emitted from the front of the light-emitting surface 13-1. Since each of the light-emitting surfaces 13-1 is inclined, the white light emitted from the front of the three light-emitting surfaces 13-1 irradiates in the obliquely downward direction.

[0027] A light-shielding sheet (not shown) is attached to the back of the non-light-emitting surface 13-2 of the diffusion cover 13 so that light does not leak from the non-light-emitting surface 13-2.

[0028] In this way, the diffusion cover 13 has a configuration combining three light-emitting surfaces 13-1 that emit white light and one non-light-emitting surface 13-2 that does not emit light. Thereby, the light emitted from the diffusion cover 13 becomes light from three directions, and it is possible to produce a visual effect with a sense of depth as if light is shining in from the outside through the sunlit window frame or the window frame in the shade when illuminated by sunlight.

[0029] The diffusion cover 13 is placed on the flange portion 11 via the packing 21. The packing 21 is formed in a rectangular thin frame shape in plan view. The packing 21 prevents the flange portion 11 and the diffusion cover 13 from directly hitting each other when they vibrate. Also, due to the elasticity of the packing 21, the force applied from the flange portion 11 to the diffusion cover 13 is alleviated, and breakage of the diffusion cover 13 can be suppressed. Furthermore, by providing the packing 21 between the flange portion 11 and the diffusion cover 13, an impression of a window frame can be given. In particular, when the packing 21 has a white-based color tone, the impression of a window frame can be enhanced. Also, the packing 21 functions as a light-shielding portion that prevents white light from leaking from the gap between the diffusion cover 13 and the flange portion 11.

[0030] Next, among the components of the light source unit 10, the components shown in FIG. 4 will be described. As shown in FIG. 4, the light source unit 10 further includes a lower guide plate 16, a light guide plate 17, a blue LED module 18, an upper guide plate 19, an insulating portion 23, a module holding portion 24, a fixing member 25, a light guide plate cover 26, and an upper cover 27. Also, the light source unit 10 further includes a control unit 30 that is disposed on the upper surface of the upper cover 27 and controls the light source unit 10. The control unit 30 includes a power supply device 31 and a dimming unit 32.

[0031] The lower guide plate 16 is placed on the module holding portion 15 shown in FIG. 3. The lower guide plate 16 is composed of two rod-shaped members and is disposed along the longitudinal end of the light guide plate 17 below the light guide plate 17. Protrusions 16-3 are provided at both ends of the two rod-shaped members that constitute the lower guide plate 16. The protrusions 16-3 extend vertically upward. The protrusions 16-3 contact the end surface 17-2 that extends in the short direction of the light guide plate 17 and restrict the movement of the light guide plate 17 in the longitudinal direction.

[0032] The upper guide plate 19 is placed on the light guide plate 17. The upper guide plate 19 is composed of two rod-shaped members and is disposed along the longitudinal end of the light guide plate 17.

[0033] The light guide plate 17 is formed in a rectangular plate shape in plan view. The light guide plate 17 diffuses the light emitted from the blue LED module 18 and emits blue light from the lower surface which is the emission surface. The light guide plate 17 is formed of an acrylic resin and contains, for example, silica as a scatterer which is a particle that scatters light. The longitudinal end portions of the light guide plate 17 are sandwiched from above and below by the lower guide plate 16 and the upper guide plate 19.

[0034] The upper surface of the light guide plate 17 is smooth for total reflection. It is desirable that the upper surface of the light guide plate 17 is mirror-finished. During the assembly work of the lighting fixture 1, if the upper surface of the light guide plate 17 is scratched, total reflection becomes difficult to occur at the scratched portion. Therefore, a part of the lower surface corresponding to the scratched portion on the upper surface looks whitish and shiny. Therefore, in order to prevent scratches on the upper surface of the light guide plate 17, the upper surface of the light guide plate 17 may be covered with a reflection sheet (not shown).

[0035] The blue LED module 18 is arranged to be parallel to the end face 17-1 extending in the longitudinal direction of the light guide plate 17. The blue LED module 18 includes two substrates 180 and a plurality of LEDs respectively arranged on the substrates 180. A plurality of through holes 18-1 are provided in the upper part of the substrate 180. The configuration and dimming control of the blue LED module 18 will be described in detail later.

[0036] The blue LED module 18 is attached to the module holding portion 24 by a fixing member 25. A cylindrical protrusion 25-1 is provided on the surface of the fixing member 25 on the side of the blue LED module 18. The protrusions 25-1 are respectively inserted into the through holes 18-1 of the substrate 180 of the blue LED module 18. With the protrusions 25-1 inserted into the through holes 18-1, the fixing member 25 is screwed to the module holding portion 24.

[0037] The module holding part 24 is formed of sheet metal with an L-shaped cross section. The module holding part 24 not only holds the substrate 180 of the blue LED module 18, but also functions as a heat sink that releases the heat from the blue LED module 18 to the outside. The module holding part 24 is attached to the upper surface of the module holding part 15 shown in FIG. 3. Further, the blue LED module 18 is attached to the module holding part 24 via the insulating part 23. When the substrate 180 of the blue LED module 18 is not a double-sided substrate, the insulating part 23 may be omitted.

[0038] The light guide plate cover 26 is placed on the upper guide plate 19. The light guide plate cover 26 covers the light guide plate 17 from above and protects the light guide plate 17. The upper cover 27 covers the components of the light source unit 10 shown in FIGS. 3 and 4 and protects the components. The control unit 30 is placed on the upper surface of the upper cover 27. The control unit 30 is composed of a power supply device 31 and a dimming unit 32.

[0039] The power supply device 31 supplies power to the blue LED module 18 and the white LED module 14. The dimming unit 32 dims each LED included in the blue LED module 18 and the white LED module 14. The power supply device 31 and the dimming unit 32 are electrically connected by wiring such as jumper wiring. Further, the power supply device 31 and the dimming unit 32 are electrically connected to the power terminal block and the signal terminal block of the terminal block 54 of the fixture body 50 in a state where the light source unit 10 is attached to the fixture body 50.

[0040] FIG. 5 is a schematic cross-sectional view showing the configuration of the lighting fixture 1 according to the first embodiment. FIG. 5 schematically shows a cross section of the lighting fixture 1 cut by a plane parallel to one side surface in the short direction at the central portion in the longitudinal direction.

[0041] As shown in Fig. 5, the light source unit 10 is disposed within the opening at the lower end of the instrument body 50. A V-spring 12 is provided on the upper surface of the flange portion 11 of the light source unit 10. The V-spring 12 is held in a state of being hooked to a V-spring mounting fitting 53 provided on the instrument body 50. Thereby, the light source unit 10 and the instrument body 50 are engaged, and the light source unit 10 is held by the instrument body 50.

[0042] The white LED module 14 is held by the module holding portion 15 and disposed on the back surface of the diffusion cover 13. Also, the blue LED module 18 is held by a module holding portion 24 fixed to the upper surface of the module holding portion 15, and is disposed so as to face the end surface 17-1 of the light guide plate 17 through the gap 33. The diffusion cover 13 and the light guide plate 17 are disposed in directions intersecting each other. Specifically, the light guide plate 17 is disposed parallel to the ceiling C, and the diffusion cover 13 is disposed so as to extend obliquely downward from the light guide plate 17.

[0043] The white light emitted from the white LED module 14 is incident from the back surface of the diffusion cover 13 and emitted from the front surface of the light emitting surface 13-1 of the diffusion cover 13. Since the light emitting surface 13-1 is inclined, the white light emitted from the front surface of the light emitting surface 13-1 illuminates the obliquely downward direction. Also, the light emitted from the blue LED module 18 is incident on the end surface 17-1 of the light guide plate 17 and travels within the light guide plate 17 while undergoing total reflection at the upper and lower surfaces of the light guide plate 17. A part of the light traveling within the light guide plate 17 hits the scatterer within the light guide plate 17 and is diffused, and surface-emitted from the lower surface of the light guide plate 17.

[0044] Next, the configuration and dimming control of the blue LED module 18 in the present embodiment will be described. FIG. 6 is a diagram showing a schematic configuration of the blue LED module 18 according to Embodiment 1. In FIG. 6, a schematic configuration of one substrate 180 in the blue LED module 18 is shown, but the configuration of the other substrate 180 is the same as that in FIG. 6. As shown in FIG. 6, a plurality of white LEDs 181, a blue LED 182, and a green LED 183 are arranged on the substrate 180 of the blue LED module 18. Specifically, on the substrate 180, two white LEDs 181, two blue LEDs 182, and one green LED 183 are grouped together, and a plurality of groups are arranged in a row.

[0045] Note that the number and arrangement of the white LED 181, the blue LED 182, and the green LED 183 arranged on the substrate 180 of the blue LED module 18 are not limited to the example in FIG. 6. For example, the white LED 181, the blue LED 182, and the green LED 183 may be arranged in the lower region of the substrate 180. In this case, the light guide plate 17 and the diffusion cover 13 can be arranged close to each other, and the blue light from the light guide plate 17 and the white light from the diffusion cover 13 can be emitted in close proximity. Also, the vertical positions of the white LED 181, the blue LED 182, and the green LED 183 may be shifted. Further, the arrangement order of the white LED 181, the blue LED 182, and the green LED 183 may be appropriately determined in consideration of color variation and the design of the substrate. However, in order to reproduce the color of the sky, it is desirable that the ratio of the number of the white LED 181, the blue LED 182, and the green LED 183 to the total number of LEDs in the blue LED module 18 be 2:2:1.

[0046] On the upper part of the substrate 180 of the blue LED module 18, a plurality of through holes 18-1 are provided. The through hole 18-1 (not shown) provided in the central portion of the substrate 180 is circular, and the other through holes 18-1 are elliptical extending in the longitudinal direction. The substrate 180 of the blue LED module 18 thermally expands and contracts due to the heat emitted from the white LED 181, blue LED 182, and green LED 183. Therefore, when the blue LED module 18 is fixed to the module holding portion 24, there is a possibility that the substrate 180 of the blue LED module 18 may be warped or distorted due to thermal expansion and contraction.

[0047] Therefore, in the present embodiment, the substrate 180 is provided with elliptical through holes 18-1, and the protruding portions 25-1 of the fixing member 25 are configured to be inserted into the through holes 18-1 with play. Thereby, even when the substrate 180 of the blue LED module 18 thermally expands and contracts, the protruding portions 25-1 can move in the longitudinal direction within the elliptical through holes 18-1, and warping or distortion of the substrate 180 can be suppressed.

[0048] The white LED 181 is, for example, an LED having a color temperature of 5000 (K) and a forward voltage of 6V. The blue LED 182 is, for example, an LED having a dominant wavelength of 440 to 480 nm and a forward voltage of 3V. The green LED 183 is, for example, an LED having a dominant wavelength of 510 to 570 nm and a forward voltage of 3V. The white LED 181 has a higher forward voltage than the blue LED 182 and the green LED 183, and when the same current flows, it emits light brighter than the blue LED 182 and the green LED 183. That is, in the blue LED module 18, the output balance of each LED is white LED 181 > blue LED 182 > green LED 183.

[0049] The blue LED module 18 of the present embodiment controls the light emission of the white LED 181, blue LED 182, and green LED 183 to reproduce the color of the sky, particularly the color of the blue sky. Thus, by using three colors of white, blue, and green, the color rendering property can be improved as compared with the case of using three colors of red, blue, and green.

[0050] FIG. 7 is a control block diagram of the lighting fixture 1 according to Embodiment 1. As shown in FIG. 7, the power supply device 31 includes a first lighting circuit 31a, a second lighting circuit 31b, and a third lighting circuit 31c that output currents to the white LED 181, the blue LED 182, and the green LED 183 of the blue LED module 18, respectively. By providing a lighting circuit for each LED individually, two-dimensional control can be performed on the emission color of the blue LED module 18, so that various blue skies can be reproduced. The power supply device 31 further includes a fourth lighting circuit 31d and a fifth lighting circuit 31e that output currents to the white LED 141 and the white LED 142 of the white LED module 14, respectively.

[0051] The power supply device 31 further includes a power control circuit 310. The power control circuit 310 is composed of hardware such as a dedicated single circuit or a composite circuit, a microcomputer or a processor that executes a program stored in a memory, or a combination thereof. The power control circuit 310 individually controls the outputs of the first lighting circuit 31a to the fifth lighting circuit 31e based on a command from the dimming unit 32. The power supply device 31 further includes a circuit (not shown) such as a rectifying circuit for converting a commercial power supply into a DC power supply.

[0052] The first lighting circuit 31a to the fifth lighting circuit 31e receive power supply from a circuit such as a rectifying circuit included in the power supply device 31. The first lighting circuit 31a to the fifth lighting circuit 31e also include switching elements (not shown) for lighting each LED. The first lighting circuit 31a to the fifth lighting circuit 31e individually light each LED according to an instruction from the power control circuit 310.

[0053] The dimming unit 32 outputs a dimming signal for controlling the first lighting circuit 31a to the fifth lighting circuit 31e to the power control circuit 310 of the power supply device 31. That is, the dimming unit 32 controls the emission of the white LED 181, the blue LED 182, and the green LED 183 of the blue LED module 18, and the white LED 141 and 142 of the white LED module 14.

[0054] The dimming unit 32 has, for example, a timer (not shown) and controls the outputs of the first to fifth lighting circuits 31a to 31e through the power control circuit 310 according to the time. The dimming unit 32 is composed of hardware such as a dedicated single circuit or a composite circuit, a microcomputer or a processor that executes a program stored in a memory, or a combination thereof. Further, the dimming unit 32 is provided with a port into which an external interface is inserted and data input / output is performed.

[0055] The dimming signal is, for example, a PWM (Pulse Width Modulation) signal indicating a command value of the output current to each LED, and the light amount of each LED is changed according to the command value. The power control circuit 310 of the power supply device 31 controls the outputs of the first to fifth lighting circuits 31a to 31e based on the PWM signal, and performs dimming control of the blue LED module 18 and the white LED module 14 by changing the current flowing through each LED. Note that, as the dimming signal, a PWM signal for changing the light amount of each LED according to the duty ratio may be used.

[0056] FIG. 8 is a graph showing the light amount of the blue LED module 18 according to Embodiment 1. The horizontal axis of FIG. 8 indicates time, and the vertical axis indicates the light amount of the blue LED module 18. The blue LED module 18 of the present embodiment has its light amount changed according to the time, similarly to the white LED module 14. Specifically, as shown in FIG. 8, the light amount during the daytime (for example, from 8:00 to 16:00) is set to 100%, the light amount at dawn (for example, from 6:00 to 8:00) and dusk (for example, from 16:00 to 18:00) is set to 50%, and the light amount at night (for example, from 18:00 to 6:00) is set to 20%. Note that the times shown in FIG. 8 are merely examples and are not limited to the example of FIG. 8, and may be set as appropriate. Also, the light amount at each time may be changed according to the season. For example, when the season is summer, the daytime hours during which the light amount of the blue LED module 18 is 100% may be made longer than in the case of winter. Further, according to the season, not only the light amount but also the chromaticity of the blue LED module 18 may be changed.

[0057] When the usage time of the lighting fixture 1 becomes long, the light guide plate 17 deteriorates due to temperature load during lighting or the like, and the amount of light and chromaticity of the light emitted from the light guide plate 17 change. Therefore, the dimming unit 32 that instructs the power control circuit 310 which instructs the first lighting circuit 31a to the third lighting circuit 31c of the present embodiment corrects the output from the first lighting circuit 31a to the third lighting circuit 31c to each LED according to the usage time based on the information regarding the deterioration of the light guide plate 17. The deterioration information of the light guide plate 17 includes the secular deterioration data of the amount of light of the light guide plate 17 and the secular deterioration data of chromaticity. The deterioration information of the light guide plate 17 is assumed to be obtained in advance by experiments or the like.

[0058] FIG. 9 is a graph showing the secular deterioration data of the amount of light of the light guide plate 17. The horizontal axis of FIG. 9 indicates the cumulative usage time [h], and the vertical axis indicates the amount of light [%] of the light emitted from the light guide plate 17. As shown in FIG. 9, the amount of light of the light emitted from the light guide plate 17 decreases as the usage time becomes longer.

[0059] FIGS. 10 and 11 are graphs showing the secular deterioration data of the chromaticity of the light guide plate 17. The horizontal axis of FIG. 10 indicates the cumulative usage time [h], and the vertical axis indicates the change value Δx of the x value in the CIE chromaticity diagram of the light emitted from the light guide plate 17. The horizontal axis of FIG. 11 indicates the cumulative usage time [h], and the vertical axis indicates the change value Δy of the y value in the CIE chromaticity diagram of the light emitted from the light guide plate 17. As shown in FIGS. 10 and 11, Δx and Δy are positive values, and it can be seen that the x value and y value of the light guide plate 17 increase due to secular deterioration. Also, it can be seen that the x value and y value of the light guide plate 17 change greatly up to 40,000 hours and hardly change after 40,000 hours.

[0060] FIG. 12 is a flowchart showing the operation of the lighting fixture 1 according to Embodiment 1. The flowchart in FIG. 12 is executed by the control unit 30 of the lighting fixture 1. First, the deterioration information of the light guide plate 17 is written into and stored in the dimming unit 32 (S1). The deterioration information of the light guide plate 17 is written into the dimming unit 32 via an external interface such as a memory card or a USB. The writing of the deterioration information of the light guide plate 17 is performed at the time of assembling the dimming unit 32 or the lighting fixture 1. Alternatively, the deterioration information of the light guide plate 17 may be written at the manufacturing factory or at the customer's site after the completion of the lighting fixture 1. However, when the characteristics of the light guide plates 17 incorporated in the lighting fixture 1 vary greatly individually, it is necessary to prepare and write the individual deterioration information of the light guide plates 17. Therefore, in such a case, the writing of the deterioration information is performed at the stage when the combination of the dimming unit 32 and the light guide plate 17 is determined at the time of assembling the lighting fixture 1 or at the time of product completion. Thereby, the efficiency of manufacturing management can be improved.

[0061] Then, it is determined whether or not to turn on the lighting fixture 1 (S2). Here, it is determined to turn on the lighting fixture 1 when a remote controller (not shown) is operated or when the lighting time according to a schedule stored in a control controller (not shown) arrives. Note that the schedule mentioned here may be held by the dimming unit 32. Wait until it is determined to turn on the lighting fixture 1 (S2: NO). When it is determined to turn on the lighting fixture 1 (S2: YES), the usage time of the lighting fixture 1 is measured in the dimming unit 32 (S3). This usage time is the cumulative usage time since the lighting fixture 1 was first turned on.

[0062] Then, in the dimming unit 32, correction factors for the white LED 181, the blue LED 182, and the green LED 183 are respectively obtained based on the stored degradation information and the current usage time (S4). The dimming unit 32 obtains a first correction factor that is the correction factor of the white LED 181, a second correction factor that is the correction factor of the blue LED 182, and a third correction factor that is the correction factor of the green LED 183. The first to third correction factors correct the dimming rate of the dimming signals of the white LED 181, the blue LED 182, and the green LED 183. For example, when the dimming rate of the dimming signal is 50% and the correction factor is 100%, the dimming rate of the corrected dimming signal is 50%. Also, for example, when the dimming rate of the dimming signal is 50% and the correction factor is 150%, the dimming rate of the corrected dimming signal is 75%.

[0063] The dimming unit 32 obtains the first to third correction factors so that the light quantity and chromaticity of the light emitted from the light guide plate 17 are substantially the same as the initial values regardless of the usage time. The initial values are the light quantity Q0 and chromaticity of the light guide plate 17 when the usage time is 0 hours. The initial value of the chromaticity is the x value (x0) and y value (y0) in the CIE chromaticity diagram. Specifically, first, chromaticity correction factors for the white LED 181, the blue LED 182, and the green LED 183 are obtained so that the chromaticity of the light guide plate 17 at the current usage time is the same as the initial chromaticity.

[0064] When the usage time is 0 hours, the chromaticity correction factors of the white LED 181, the blue LED 182, and the green LED 183 are each 100%. Also, when the usage time is N hours, first, from the degradation information of the light guide plate 17, Δx n and Δy n are extracted at the time when the usage time is N hours. Then, chromaticity correction factors for the white LED 181, the blue LED 182, and the green LED 183 are obtained so that the x value (x n ) and y value (y n ) of the light mixed with the three colors of the white LED 181, the blue LED 182, and the green LED 183 become the values of the following formulas (1) and (2). x n =x0 + Δx n ···(1) y n=y0 + Δy n ···(2)

[0065] The chromaticity of the light emitted from the light guide plate 17 changes according to the ratio of the light of the white LED 181, the blue LED 182, and the green LED 183. For example, when maintaining the dimming rate of the white LED 181 and increasing the dimming rates of the blue LED 182 and the green LED 183, the x value and y value of the light mixed with the three colors decrease. Therefore, in order to cancel out the increased x value (Δx) and y value (Δy) due to the deterioration of the light guide plate 17, it is necessary to increase the dimming rates of the blue LED 182 and the green LED 183. Therefore, the chromaticity correction rates of the blue LED 182 and the green LED 183 are set to values greater than 100%.

[0066] Actually, a plurality of chromaticity correction rates are randomly set for the white LED 181, the blue LED 182, and the green LED 183, and the chromaticity when the dimming signal is corrected with each chromaticity correction rate is obtained. Then, the chromaticity correction rate close to the x n and y n obtained by formulas (1) and (2) is adopted as the chromaticity correction rate of each LED.

[0067] And the first to third correction rates are obtained by adjusting the chromaticity correction rates of the white LED 181, the blue LED 182, and the green LED 183 so that the light quantity Q n of the light guide plate 17 at the current usage time becomes the same as the initial light quantity Q0. First, the dimming unit 32 obtains the light quantity decrease value ΔQ n at the usage time N from the deterioration information of the light guide plate 17. Then, the coefficient α is obtained from the following formula (3). α = (Q0 + ΔQ n ) / Q n ···(3)

[0068] Q nis the light quantity of the light mixed with the three colors of the white LED 181, the blue LED 182, and the green LED 183 after applying the chromaticity correction rate. When the usage time is 0 hours, the coefficient α is 1. Then, by multiplying the coefficient α by the chromaticity correction rates of the white LED 181, the blue LED 182, and the green LED 183 respectively, the first to third correction rates are obtained. Here, in order to adjust the light quantity while maintaining the ratio of the light of each LED, the same coefficient α is multiplied by each chromaticity correction rate. For example, by correcting so that the chromaticity of the light guide plate 17 at the current usage time becomes the same as the initial chromaticity, the total light quantity Qn after correction decreases to the light quantity Q0 of the initial value by the decrease value ΔQ n may be larger than the light quantity obtained by adding. In this case, the coefficient α is less than 1, and the chromaticity correction rates of each LED are corrected downward.

[0069] Then, in the dimming unit 32, the dimming signals of the white LED 181, the blue LED 182, and the green LED 183 are corrected by the obtained first to third correction rates (S5). Specifically, the dimming unit 32 corrects the dimming signal of the white LED 181 by the first correction rate, corrects the dimming signal of the blue LED 182 by the second correction rate, and corrects the dimming signal of the green LED 183 by the third correction rate. As a result, the output from the first lighting circuit 31a to the white LED 181 is corrected by the first correction rate, the output from the second lighting circuit 31b to the blue LED 182 is corrected by the second correction rate, and the output from the third lighting circuit 31c to the green LED 183 is corrected by the third correction rate.

[0070] Note that the outputs of the first lighting circuit 31a to the third lighting circuit 31c have an initial dimming rate of less than 100% in view of the correction by the correction rate. For example, when the maximum value of the first to third correction rates is 150%, the initial maximum dimming rate (for example, the dimming rate during the day) is set to 65% so that the dimming rate becomes 100% when the maximum correction rate is applied.

[0071] Then, currents based on the corrected dimming signals are supplied from the first lighting circuits 31a to 31c to the white LED 181, blue LED 182, and green LED 183, and the white LED 181, blue LED 182, and green LED 183 light up (S6). Also, currents of the fourth lighting circuit 31d and fifth lighting circuit 31e, which are output as a result of the dimming unit 32 instructing through the power control circuit 310, are supplied to the white LEDs 141 and 142 of the white LED module 14 of the white color, and the white LEDs 141 and 142 light up.

[0072] Thereafter, it is determined whether or not to turn off the lighting fixture 1 (S7). Here, when a remote controller (not shown) is operated, or when it reaches the turn-off time according to a schedule stored in a controller (not shown), it is determined to turn off the light. And when not turning off the light (S7: NO), the process returns to step S3, and the subsequent processes are repeated. On the other hand, when turning off the light (S7: YES), the supply of current to each LED is stopped, and each LED turns off (S8). Thereafter, the process returns to step S2, and it waits until it is lit again.

[0073] As described above, in the lighting fixture 1 of the present embodiment, blue light that reproduces the color of the sky is emitted from the light guide plate 17 arranged parallel to the ceiling C, and white light is emitted from three directions surrounding the light guide plate 17. Thereby, it is possible to produce a visual effect with a sense of depth as if looking at the blue sky through a sunny or shaded window frame illuminated by sunlight. Further, by adjusting the output of each LED of the blue LED module 18 based on the deterioration information and usage time of the light guide plate 17, it is possible to suppress a decrease in the reproducibility of the sky due to aging deterioration.

[0074] Furthermore, in the present embodiment, correction rates of the white LED 181, blue LED 182, and green LED 183 of the blue LED module 18 are individually set according to the deterioration information and usage time of the light guide plate 17, and the outputs are individually corrected. Thereby, compared with the case where the output to each LED is uniformly corrected according to the deterioration information, it is possible to maintain the balance of the color tone of the light emitted from the light guide plate 17 equivalent to the initial value.

[0075] Embodiment 2 Embodiment 2 will be described. In Embodiment 2, the operation of the lighting fixture 1 is different from that in Embodiment 1. The configuration of the lighting fixture 1 is the same as that in Embodiment 1. FIG. 13 is a flowchart showing the operation of the lighting fixture 1 according to Embodiment 2. The flowchart in FIG. 13 is executed by the control unit 30 of the lighting fixture 1.

[0076] First, similar to Embodiment 1, the deterioration information of the light guide plate 17 is written into and stored in the dimming unit 32 (S11). Then, based on the written deterioration information, correction rate maps for the white LED 181, the blue LED 182, and the green LED 183 are created in the dimming unit 32, respectively (S12). The correction rate map indicates the correction rate for each usage time.

[0077] FIG. 14 is a diagram showing the first correction rate map created by the dimming unit 32 according to Embodiment 2. The horizontal axis in FIG. 14 indicates the cumulative usage time [h], and the vertical axis indicates the first correction rate [%] of the white LED 181. FIG. 15 is a diagram showing the second correction rate map created by the dimming unit 32 according to Embodiment 2. The horizontal axis in FIG. 15 indicates the cumulative usage time [h], and the vertical axis indicates the second correction rate [%] of the blue LED 182. FIG. 16 is a diagram showing the third correction rate map created by the dimming unit 32 according to Embodiment 2. The horizontal axis in FIG. 16 indicates the cumulative usage time [h], and the vertical axis indicates the third correction rate [%] of the green LED 183.

[0078] The first to third correction rates for each usage time in the first to third correction rate maps are obtained in the same manner as in Embodiment 1. The created first to third correction rate maps are stored in the dimming unit 32.

[0079] Then, it is determined whether or not to turn on the lighting fixture 1 (S13). Here, when a remote controller (not shown) is operated, or when it reaches the lighting time according to a schedule stored in a control controller (not shown), it is determined to turn on. Wait until the lighting of the lighting fixture 1 is started (S13: NO). And when it is determined to turn on the lighting fixture 1 (S13: YES), in the dimming unit 32, the usage time of the lighting fixture 1 is measured (S14). This usage time is the cumulative usage time since the lighting fixture 1 was first turned on.

[0080] And in the dimming unit 32, based on the usage time and the correction rate map, the dimming signals of the white LED 181, the blue LED 182, and the green LED 183 are corrected (S15). Specifically, the dimming unit 32 refers to the first correction rate map and corrects the dimming signal of the white LED 181 with the first correction rate corresponding to the current usage time. Also, the dimming unit 32 refers to the second correction rate map and corrects the dimming signal of the blue LED 182 with the second correction rate corresponding to the current usage time. Also, the dimming unit 32 refers to the third correction rate map and corrects the dimming signal of the green LED 183 with the third correction rate corresponding to the current usage time. Thereby, the output from the first lighting circuit 31a to the white LED 181 is corrected with the first correction rate, the output from the second lighting circuit 31b to the blue LED 182 is corrected with the second correction rate, and the output from the third lighting circuit 31c to the green LED 183 is corrected with the third correction rate.

[0081] And currents based on the corrected dimming signals are supplied from the first lighting circuit 31a to the third lighting circuit 31c to the white LED 181, the blue LED 182, and the green LED 183, and the white LED 181, the blue LED 182, and the green LED 183 are turned on (S16). Also, currents of the fourth lighting circuit 31d and the fifth lighting circuit 31e, which are output as a result of the dimming unit 32 instructing through the power control circuit 310, are supplied to the white LEDs 141 and 142 of the white LED module 14 for white, and the white LEDs 141 and 142 are turned on.

[0082] Thereafter, it is determined whether or not to turn off the lighting fixture 1 (S17). Here, when a remote control (not shown) is operated, or when it reaches the turn-off time according to a schedule stored in a control controller (not shown), it is determined to turn off the light. And when not turning off the light (S17: NO), the process returns to step S14, and subsequent processes are repeated. On the other hand, when turning off the light (S17: YES), the supply of current to each LED is stopped, and each LED turns off (S18). Thereafter, the process returns to step S13 and waits until it is lit again.

[0083] As described above, also in the lighting fixture 1 of the present embodiment, the same effects as those of the first embodiment can be obtained. Further, compared with the case of obtaining the first to third correction rates for each use time as in the first embodiment, the processing of the dimming unit 32 at the time of lighting can be simplified.

[0084] Embodiment 3. Embodiment 3 will be described. In Embodiment 3, in the operation of the lighting fixture 1, it is different from Embodiment 1 and Embodiment 2. The configuration of the lighting fixture 1 is the same as that of the first embodiment. FIG. 17 is a flowchart showing the operation of the lighting fixture 1 according to the third embodiment. The flowchart of FIG. 17 is executed by the control unit 30 of the lighting fixture 1.

[0085] As shown in FIG. 17, in the present embodiment, first, the first to third correction rate maps are respectively written and stored in the dimming unit 32 (S21). The first to third correction rate maps indicate the correction rates for each use time, similar to the second embodiment. The first to third correction rate maps are created in advance by an external processing device such as a PC based on the deterioration information of the light guide plate 17 in the same method as in the second embodiment. And it is written into the dimming unit 32 via an external interface such as a memory card or a USB. Thereafter, the same processes of steps S13 to S18 as in the second embodiment are executed.

[0086] As described above, the lighting fixture 1 of the present embodiment can also achieve the same effects as those of the first embodiment. Further, compared with the case where the correction rate is obtained by the dimming unit 32 and the case where the correction rate map is created as in the first embodiment and the second embodiment, the processing load of the dimming unit 32 can be reduced.

[0087] The above is the description of the embodiment. However, the present disclosure is not limited to the above-described embodiment, and various modifications or combinations can be made without departing from the gist of the present disclosure. For example, in the above-described embodiment, the dimming unit 32 corrects the dimming signal of each LED to correct the outputs of the first lighting circuit 31a to the third lighting circuit 31c, but the present disclosure is not limited thereto. For example, the dimming unit 32 may transmit the dimming signal and the first to third correction rates to the power control circuit 310, and the power control circuit 310 may correct the outputs of the first lighting circuit 31a to the third lighting circuit 31c based on the correction rates.

[0088] In addition, in the above-described embodiment, the deterioration information of the light guide plate 17 is written into the dimming unit 32. However, the deterioration information may be written into the power control circuit 310 in the power supply device 31. In that case, the dimming unit 32 simply sends a dimming signal, and the power control circuit 310 performs output correction according to the passage of time and the deterioration information. At this time, the power control circuit 310 is assumed to have a timer function for measuring the appliance usage time. For example, when the dimming unit 32 sends a dimming signal for the daytime scene to the power control circuit 310, the power control circuit 310 sends command values for outputting 200 mA to the first lighting circuit 31a, 100 mA to the second lighting circuit 31b, and 100 mA to the third lighting circuit 31c immediately after the start of appliance use. On the other hand, when the appliance usage time has elapsed for 12,800 hours, the power control circuit 310 sends command values for outputting 195 mA corrected to 97.3% to the first lighting circuit 31a, 118 mA corrected to 118.2% to the second lighting circuit 31b, and 119 mA corrected to 118.7% to the third lighting circuit 31c, respectively. In addition, in yet another modification, instead of the dimming unit 32 or the power control circuit 310, the deterioration information may be written into each of the first lighting circuit 31a to the third lighting circuit 31c.

[0089] Furthermore, in the above-described embodiment, the case where the dimming signal is corrected every usage time has been described. However, for example, the dimming signal may be corrected every 100 hours or every 1000 hours. Also, for the white LED module 14, the dimming signal may be corrected according to the deterioration information of the diffusion cover.

[0090] Furthermore, in the above-described embodiment, the lighting fixture 1 has been described on the premise that it is attached to the ceiling C, but the lighting fixture 1 may be installed on an interior wall of the room. However, in that case, the white LED module 14 shall be L-shaped in plan view. Also, accordingly, for the diffusion cover 13 as well, of the four side surfaces, two adjacent surfaces shall be the light-emitting surfaces 13-1, and the other two surfaces shall be the non-light-emitting surfaces 13-2. For other configurations, they shall be the same as those in the above-described embodiment. Thereby, similar to the case where the lighting fixture 1 is attached to the ceiling C, even when the lighting fixture 1 is installed on an interior wall of the room, a visual effect can be produced such that one can see a deep blue sky through a sunny or shaded window frame illuminated by sunlight. Also, the shape of the lighting fixture 1 is not limited to a rectangle, and it may be a square box shape.

[0091] Also, in the above-described embodiment, the configuration is such that each LED is provided with the first lighting circuit 31a to the fifth lighting circuit 31e, but it is not limited thereto. For example, the lighting circuits of the white LED 181 and the blue LED 182 of the blue LED module 18 may be shared. Thereby, the number of components can be further reduced, and cost reduction and miniaturization of the lighting fixture 1 can be realized.

[0092] Furthermore, the holding structure of the blue LED module 18 is not limited to the structure described in the above-described embodiment. Also, in the lighting fixture 1, the white LED module 14 may be omitted, and a configuration may be adopted in which only the blue LED module 18 is provided as a light source.

[0093] Also, in the above-described embodiment, the dimming unit 32 may perform two-stage control in which the light quantity of the green LED 183 is first decreased and then the light quantities of the white LED 181 and the blue LED 182 are decreased. Alternatively, it may be two-stage control in which the light quantities of the white LED 181 and the blue LED 182 are decreased and then the light quantity of the green LED 183 is decreased. Further, the control of the white LED 181, the blue LED 182, and the green LED 183 is not limited to that described above, and depending on the target sky color, both or either one of the x value and the y value in the CIE chromaticity diagram may be changed to the negative side or the positive side.

Explanation of Signs

[0094] 1 Lighting fixture, 10 Light source unit, 11 Flange portion, 12 V spring, 13 Diffusion cover, 13-1 Light emitting surface, 13-2 Non-light emitting surface, 14 White LED module, 15 Module holding portion, 15-1 Mounting flange, 16 Lower guide plate, 16-3 Protrusion, 17 Light guide plate, 17-1 End face, 17-2 End face, 18 Blue LED module, 18-1 Through hole, 19 Upper guide plate, 21 Packing, 22 Packing, 23 Insulating portion, 24 Module holding portion, 25 Fixing member, 25-1 Protrusion, 26 Light guide plate cover, 27 Upper cover, 30 Control portion, 31 Power supply device, 31a First lighting circuit, 31b Second lighting circuit, 31c Third lighting circuit, 31d Fourth lighting circuit, 31e Fifth lighting circuit, 32 Dimming unit, 33 Gap, 50 Fixture body, 51 Main surface, 51-1 Bolt hole, 51-2 Wire hole, 52 Side surface, 53 V spring mounting bracket, 54 Terminal block, 61 Nut, 140 Substrate, 141 White LED, 142 White LED, 180 Substrate, 181 White LED, 182 Blue LED, 183 Green LED, 310 Power supply control circuit, B Suspension bolt, C Ceiling, H Embedded hole.

Claims

1. A blue LED module having a white LED, a blue LED, and a green LED; A light guide plate that diffuses the light of the blue LED module to emit surface light; A control unit that controls the blue LED module to reproduce the color of the sky, comprising: Based on the deterioration information and usage time of the light guide plate, the control unit Sets a first correction rate for correcting the output to the white LED, A second correction rate for correcting the output to the blue LED, And a third correction rate for correcting the output to the green LED, Corrects the output to the white LED using the first correction rate, Corrects the output to the blue LED using the second correction rate, A lighting fixture that corrects the output to the green LED using the third correction rate.

2. The lighting fixture according to claim 1, wherein the deterioration information includes secular deterioration data of the light quantity of the light guide plate and secular deterioration data of the chromaticity of the light guide plate, and is stored in the control unit in advance.

3. The control unit Obtains chromaticity correction rates of the white LED, the blue LED, and the green LED respectively based on the secular deterioration data of the chromaticity and the usage time, And adjusts the chromaticity correction rates of the white LED, the blue LED, and the green LED based on the secular deterioration data of the light quantity and the usage time to obtain the first correction rate, the second correction rate, and the third correction rate. The lighting fixture according to claim 2.

4. The control unit Creates a first correction rate map including the first correction rate for each usage time, A second correction rate map including the second correction rate for each usage time, And a third correction rate map including the third correction rate for each usage time. The lighting fixture according to claim 1.

5. The control unit includes a first correction rate map created based on the deterioration information and including the first correction rate for each usage time, a second correction rate map including the second correction rate for each usage time, and a third correction rate map including the third correction rate for each usage time, which are stored in advance. The lighting fixture according to claim 1. ​

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