Lighting fixtures

Abstract

To provide a lighting fixture that can improve the reproducibility of the sky seen through a window.SOLUTION: A lighting fixture includes a blue light module having a plurality of light sources with different emission colors, a light guide plate that diffuses the light of the blue light module and emits surface light, a white light module having a plurality of light emitting units arranged around the light guide plate, a diffusion cover that emits light from the white light module, and a control device that controls the white light module. The control device controls lighting of the plurality of light emitting units according to time.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present disclosure relates to a lighting fixture comprising multiple light sources. [Background technology]

[0002] Conventionally, lighting fixtures capable of reproducing the appearance of the sky have been proposed. For example, the lighting fixture described in Patent Document 1 uses a light-emitting module having LEDs of multiple colors, and controls the emission of blue light, yellow light, orange light, red light, and white light to reproduce the appearance of the sky. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-102166 A Summary of the Invention [Problem to be solved by the invention]

[0004] The lighting device described in Patent Document 1 is configured to project a natural sky such as a blue sky, a cloudy sky, an evening sky, etc., on a light diffusion plate by controlling the emission of blue light, yellow light, orange light, red light, and white light. Here, when light from the sky enters a building through a window, it illuminates the window frame around the window. Therefore, when looking at an actual window, not only the sky projected on the window is seen, but also the sunlight shining from the sky is seen around the window. However, although the lighting device described in Patent Document 1 can project the sky on a diffusion plate, it cannot fully reproduce the appearance of the actual sky seen through the window.

[0005] The present disclosure is devised to solve the above-mentioned problems, and aims to provide a lighting fixture that can improve the reproduction of the sky as seen through a window. [Means for solving the problem]

[0006] The lighting device according to the present disclosure includes a blue light module having a plurality of light sources with different light emission colors, a light guide plate that diffuses and emits the light of the blue light module, a white light module having a plurality of light emitting units arranged around the light guide plate, a diffusion cover that emits the light of the white light module, and The lighting status of multiple light-emitting parts of Depending on the time and a control device for controlling the The plurality of light-emitting units include a third light-emitting unit and a fourth light-emitting unit arranged to sandwich a light guide plate, and the third light-emitting unit and the fourth light-emitting unit have at least a warm-color second light source, and the control device turns off or dims the second light source in either the third light-emitting unit or the fourth light-emitting unit when the time is sunrise, morning, evening, or sunset, and lights up the second light source in the other of the third light-emitting unit or the fourth light-emitting unit brighter than the second light source in the other of the third light-emitting unit and the fourth light-emitting unit. It is something. Effect of the Invention

[0007] According to the lighting device of the present disclosure, by controlling a number of light-emitting elements arranged around the light guide plate according to the time of day, it is possible to reproduce the sunlight around the window, thereby improving the reproduction of the sky as seen through the window. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the appearance of a lighting fixture according to a first embodiment. [Diagram 2] 1 is an exploded perspective view showing a configuration of a lighting fixture according to a first embodiment. [Diagram 3] 1 is an exploded perspective view showing a configuration of a light source unit of a lighting fixture according to Embodiment 1. FIG. [Figure 4] 1 is an exploded perspective view showing a configuration of a light source unit of a lighting fixture according to Embodiment 1. FIG. [Diagram 5] 1 is a cross-sectional view showing a configuration of a lighting device according to a first embodiment. [Figure 6] 1 is a diagram showing a schematic configuration of a blue light module according to a first embodiment. [Figure 7] 1 is a control block diagram of a lighting fixture according to a first embodiment. [Figure 8] 4 is a graph showing the amount of light from the blue light module according to the first embodiment. [Figure 9] 4 is a graph illustrating dimming control of the blue light module according to the first embodiment. [Figure 10] 1 is a diagram showing an example of installation of a lighting fixture according to a first embodiment. [Figure 11]4 is a diagram showing lighting modes for different time periods of the white light module according to the first embodiment. FIG. [Figure 12] 11 is a diagram illustrating dimming control of a first light-emitting unit and a second light-emitting unit of the white light module according to the second embodiment. FIG. [Figure 13] 13 is a diagram illustrating dimming control of a third light-emitting unit of the white light module according to the second embodiment. FIG. [Figure 14] 13 is a diagram showing dimming control of a fourth light-emitting unit of the white light module according to the second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the lighting fixture will be described with reference to the drawings. In each drawing, the same reference numerals are used to denote the same or equivalent parts, and this is common throughout the specification. In addition, throughout the specification, the vertical direction from the floor to the ceiling will be referred to as the "upper direction" and the ceiling side will be referred to as the "upper side". Similarly, the vertical direction from the ceiling to the floor will be referred to as the "lower direction" and the floor side will be referred to as the "lower side". In each drawing, the relative dimensional relationship or shape of each component may differ from the actual one.

[0010] Embodiment 1 1 is a perspective view showing the appearance of a lighting fixture 1 according to embodiment 1. The lighting fixture 1 is a ceiling-embedded lighting fixture, and includes a fixture body 50 that is embedded in a ceiling, and a light source unit 10 that is attached to the fixture body 50. The light source unit 10 includes a diffusion cover 13 and a light guide plate 17 that irradiate light.

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

[0012] Of the four side surfaces 52 of the fixture body 50, a V-spring mounting bracket 53 is attached to the inner surfaces of two opposing side surfaces 52. The V-spring mounting bracket 53 hooks and holds a V-spring 12 (described later) provided on the light source unit 10. In addition, bolt holes 51-1 are provided at the four corners of the main surface 51. In addition, a hanging bolt B is hung from an embedding hole H in the ceiling C. The fixture body 50 is fixed to the ceiling C by inserting the hanging bolt B into the bolt hole 51-1 and then tightening the hanging bolt B with a nut 61.

[0013] Further, the main surface 51 is formed with electric wire holes 51-2 and is provided with a terminal block 54. The terminal block 54 has a power terminal block and a signal line terminal block. In FIG. 2, the power terminal block and the signal line terminal block are not shown. Electric wires and signal wires are drawn out from the electric wire hole 51-2. The electric wires drawn out from the electric wire hole 51-2 are electrically connected to the power terminal block of the terminal block 54. Furthermore, the signal wires drawn out from the electric wire hole 51-2 are 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 body 50. The light source unit 10 includes an upper cover 27, a flange portion 11, a V-shaped spring 12, a diffusion cover 13, and a light guide plate 17. The upper cover 27 is formed into a quadrangular pyramid with an open lower end. Each of the four side surfaces of the upper cover 27 is formed into a trapezoidal shape, with the upper side being shorter than the lower side. The flange portion 11 is formed into a rectangular frame shape in a plan view. As shown in FIG. 2, the flange portion 11 is disposed so as to protrude horizontally outward 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 body 50. The V springs 12 engage with the V spring mounting brackets 53, thereby suspending and holding the light source unit 10 on the fixture 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 invisible to the user.

[0016] Figures 3 and 4 are exploded perspective views showing the configuration of light source unit 10 of lighting fixture 1 according to embodiment 1. Light source unit 10 is composed of components shown in Figure 3 and components shown in Figure 4. Figure 3 shows the components provided in a lower portion of light source unit 10, and Figure 4 shows the components provided in an upper portion of light source unit 10.

[0017] Among the components of the light source unit 10, the components shown in Fig. 3 will be described first. As shown in Fig. 3, the light source unit 10 includes a flange portion 11, a V-shaped spring 12, a packing 21, a diffusion cover 13, a packing 22, a white light module 14, and a holder 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 holding portion 15 is formed in a rectangular frame shape in a plan view. The holding portion 15 is configured by combining four members. As shown in FIG. 5 described later, each of the four members has an L-shaped cross section. Also, as shown in FIG. 3, a mounting flange 15-1 is provided at the lower end of each of the four members of the holding portion 15. The mounting flange 15-1 is attached to the flange portion 11 by a screw.

[0020] The white light module 14 includes a first light-emitting unit 140-1, a second light-emitting unit 140-2, a third light-emitting unit 140-3, and a fourth light-emitting unit 140-4. The first light-emitting unit 140-1, the second light-emitting unit 140-2, the third light-emitting unit 140-3, and the fourth light-emitting unit 140-4 are arranged to form the four sides of a rectangle. The first light-emitting unit 140-1 is arranged opposite the second light-emitting unit 140-2, and the third light-emitting unit 140-3 is arranged opposite the fourth light-emitting unit 140-4. The angle between the first light-emitting unit 140-1 and the third light-emitting unit 140-3 and the angle between the first light-emitting unit 140-1 and the fourth light-emitting unit 140-4 are 90°. The angle between second light-emitting unit 140-2 and third light-emitting unit 140-3, and the angle between second light-emitting unit 140-2 and fourth light-emitting unit 140-4 are 90°. In the following description, first light-emitting unit 140-1, second light-emitting unit 140-2, third light-emitting unit 140-3, and fourth light-emitting unit 140-4 may be collectively referred to as "light-emitting unit 140."

[0021] The first light-emitting unit 140-1, the second light-emitting unit 140-2, the third light-emitting unit 140-3, and the fourth light-emitting unit 140-4 each include a plurality of first light sources 141, a plurality of second light sources 142, and a substrate 143 on which the plurality of first light sources 141 and the plurality of second light sources 142 are mounted. The numbers of the first light sources 141 and the second light sources 142 in the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4 may be the same or may differ depending on the size of the substrate 143 of the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4. The first light source 141 and the second light source 142 are white LEDs having different color temperatures. The white light module 14 can emit white light from any of the four directions in which the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4 are arranged.

[0022] The first light source 141 is, for example, a cool white LED having a color temperature of 4000 to 5000 (K). The second light source 142 is, for example, a warm white LED having a color temperature of 2600 to 3000 (K). By changing the dimming rate of the first light source 141 and the second light source 142 of the white light module 14, it is possible to emit white light of various color temperatures and various amounts of light. Furthermore, the first light source 141 and the second light source 142 are alternately arranged on the board 143 in pairs. Note that the arrangement of the first light source 141 and the second light source 142 on the board 143 is not limited to this, and the first light source 141 and the second light source 142 may be alternately arranged one by one, or three or more may be alternately arranged.

[0023] Note that first light source 141 and second light source 142 may be light emitting elements or light emitting devices other than LEDs. Also, first light emitting unit 140-1 to fourth light emitting unit 140-4 of white light module 14 may include only one type of light source, or may include three or more types of light sources. First light emitting unit 140-1 to fourth light emitting unit 140-4 of white light module 14 are respectively disposed on the inner side surfaces of holding unit 15 and are held by holding unit 15. The dimming control of white light module 14 will be described in detail later.

[0024] The packing 22 is formed in a thin rectangular frame shape in a plan view. The packing 22 is disposed between the upper end face of the diffusion cover 13 and the lower face, which is the emission face of the light guide plate 17 shown in FIG. 4. The packing 22 blocks light emitted from the blue light module 18 described later from the emission face of the light guide plate 17 and into the upper end face of the diffusion cover 13. The packing 22 also blocks white light emitted from the white light module 14 from the upper end face of the diffusion cover 13 and into the emission face of the light guide plate 17. The packing 22 also functions as a cushioning material when the lighting device 1 is shaken by an earthquake or the like.

[0025] The diffusion cover 13 is made of, for example, white resin, and is formed in a rectangular frame shape in a plan view. The diffusion cover 13 has a quadrangular pyramid shape with the upper and lower sides open. 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 made of a trapezoidal diffusion plate, and the length of the upper side is shorter than the length of the lower side. In addition, since each of the four side surfaces of the diffusion cover 13 is inclined, the position of the upper side is arranged to be more inward than the position of the lower side in a plan view. As a result, the internal space of the diffusion cover 13 is tapered and enlarged downward. The diffusion cover 13 may be formed by combining four trapezoidal diffusion plates, or may be formed by integral molding. Here, in each of the four side surfaces of the diffusion cover 13, the inner surface facing the internal 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 disposed inside the white light module 14. That is, the four light emitting units 140 of the white light module 14 are disposed on the rear side of the four side surfaces of the diffusion cover 13. Of the four side surfaces of the diffusion cover 13, the side surface disposed in front of the first light emitting unit 140-1 of the white light module 14 is defined as the light emitting surface 130-1, and the side surface disposed in front of the second light emitting unit 140-2 is defined as the light emitting surface 130-2. Of the four side surfaces of the diffusion cover 13, the side surface disposed in front of the third light emitting unit 140-3 of the white light module 14 is defined as the light emitting surface 130-3, and the side surface disposed in front of the fourth light emitting unit 140-4 is defined as the light emitting surface 130-4. In the following description, the light emitting surface 130-1, the light emitting surface 130-2, the light emitting surface 130-3, and the light emitting surface 130-4 may be collectively referred to as the "light emitting surface 130". The white light emitted from the light-emitting unit 140 of the white light module 14 enters from the back surface of the light-emitting surface 130 of the diffusion cover 13, passes through the light-emitting surface 130, and is emitted from the front surface of the light-emitting surface 130. Since each of the side surfaces of the diffusion cover 13 is inclined, the white light emitted from the front surface of the light-emitting surface 130 irradiates in an obliquely downward direction.

[0027] The diffusion cover 13 is placed on the flange portion 11 via a packing 21. The packing 21 is formed in a rectangular thin frame shape in a plan view. The packing 21 prevents the flange portion 11 and the diffusion cover 13 from directly colliding with each other when the flange portion 11 and the diffusion cover 13 vibrate. In addition, the elasticity of the packing 21 reduces the force applied from the flange portion 11 to the diffusion cover 13, and damage to 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 as a window frame can be given. In particular, when the packing 21 has a white-based color tone, the impression as a window frame can be strengthened. The packing 21 also 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.

[0028] Next, the components of the light source unit 10, those 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 light module 18, an upper guide plate 19, an insulating section 23, a holding section 24, a fixing member 25, a light guide plate cover 26, and an upper cover 27. The light source unit 10 further includes a power supply unit 30 disposed on the upper surface of the upper cover 27.

[0029] The lower guide plate 16 is placed on the holder 15 shown in FIG. 3. The lower guide plate 16 is composed of two rod-shaped members, and is disposed below the light guide plate 17 along the ends of the light guide plate 17 extending in the longitudinal direction. Protrusions 16-3 are provided on both ends of the two rod-shaped members constituting the lower guide plate 16. The protrusions 16-3 extend vertically upward. The protrusions 16-3 come into contact with an end face 17-2 extending in the lateral direction of the light guide plate 17, and restrict the movement of the light guide plate 17 in the longitudinal direction.

[0030] The upper guide plate 19 is placed on the light guide plate 17. The upper guide plate 19 is made up of two rod-shaped members, and is disposed along the ends of the light guide plate 17 extending in the longitudinal direction.

[0031] The light guide plate 17 is formed into a rectangular plate shape in a plan view. The light guide plate 17 diffuses the light emitted from the blue light module 18 and emits light from the lower surface, which is the emission surface. The light guide plate 17 is made of acrylic resin and contains, for example, silica as a scattering body, which is a particle that scatters light. The longitudinal ends of the light guide plate 17 are sandwiched from above and below between the lower guide plate 16 and the upper guide plate 19.

[0032] The upper surface of light guide plate 17 is smooth to allow for total reflection. The upper surface of light guide plate 17 is preferably mirror-finished. If the upper surface of light guide plate 17 is scratched during the assembly of lighting device 1, total reflection will be less likely to occur at the scratched area. As a result, a portion of the lower surface corresponding to the scratched area of ​​the upper surface will appear to shine whitishly. Therefore, in order to prevent the upper surface of light guide plate 17 from being scratched, the upper surface of light guide plate 17 may be covered with a reflective sheet (not shown).

[0033] Blue light module 18 is disposed so as to be parallel to end face 17-1 extending in the longitudinal direction of light guide plate 17. Blue light module 18 includes two substrates 180 and a plurality of light sources disposed on each substrate 180. A plurality of through holes 18-1 are provided in the upper portion of substrate 180. The configuration and dimming control of blue light module 18 will be described in detail later.

[0034] The blue light module 18 is attached to the holding part 24 by a fixing member 25. A cylindrical protrusion 25-1 is provided on the surface of the fixing member 25 facing the blue light module 18. The protrusions 25-1 are inserted into the through holes 18-1 of the substrate 180 of the blue light module 18. With the protrusions 25-1 inserted into the through holes 18-1, the fixing member 25 is screwed to the holding part 24.

[0035] The holding part 24 is formed of a metal sheet having an L-shaped cross section. The holding part 24 not only holds the substrate 180 of the blue light module 18, but also functions as a heat sink that releases heat from the blue light module 18 to the outside. The holding part 24 is attached to the upper surface of the holding part 15 shown in Fig. 3. The blue light module 18 is attached to the holding part 24 via an insulating part 23. If the substrate 180 of the blue light module 18 is not a double-sided substrate, the insulating part 23 may be omitted.

[0036] 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 to protect the light guide plate 17. The upper cover 27 covers the components of the light source unit 10 shown in Figs. 3 and 4 to protect the components. The power supply unit 30 is placed on the upper surface of the upper cover 27. The power supply unit 30 houses a switch 31, an input filter 32, a PFC circuit 33, a first drive unit 71 to a ninth drive unit 79, a control device 4, and the like, which will be described later (Fig. 7). When the light source unit 10 is attached to the fixture body 50, each part in the power supply unit 30 is electrically connected to the power terminal block and the signal terminal block of the terminal block 54 of the fixture body 50.

[0037] Fig. 5 is a cross-sectional view showing a configuration of lighting device 1 according to embodiment 1. Fig. 5 shows a cross section of lighting device 1 taken at a longitudinal center portion along a plane parallel to one lateral side in the lateral direction.

[0038] 5, the light source unit 10 is disposed within an opening at the lower end of the fixture body 50. A V-spring 12 is provided on the upper surface of a flange portion 11 of the light source unit 10. The V-spring 12 is held in a state in which it is hooked onto a V-spring mounting bracket 53 provided on the fixture body 50. This causes the light source unit 10 and the fixture body 50 to engage with each other, and the light source unit 10 is held by the fixture body 50.

[0039] The white light module 14 is held by a holder 15 and disposed on the back surface of the diffusion cover 13. The light emitting section 140 of the white light module 14 is disposed in a rectangular shape around the light guide plate 17. The blue light module 18 is held by a holder 24 fixed to the upper surface of the holder 15 and disposed so as to face an end surface 17-1 of the light guide plate 17 via a gap. The diffusion cover 13 and the light guide plate 17 are disposed so as to intersect with 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.

[0040] The white light emitted from the white light module 14 is incident on the back surface of the diffusion cover 13 and is emitted from the front surface of each light-emitting surface 130 of the diffusion cover 13. Since the light-emitting surface 130 of the diffusion cover 13 is inclined, the white light emitted from the front surface of the light-emitting surface 130 illuminates an obliquely downward direction. In addition, the light emitted from the blue light module 18 is incident on the end surface 17-1 of the light guide plate 17 and travels inside the light guide plate 17 while being totally reflected by the upper and lower surfaces of the light guide plate 17. A part of the light traveling inside the light guide plate 17 hits a scatterer in the light guide plate 17 and is diffused, and is surface-emitted from the lower surface of the light guide plate 17.

[0041] Next, the configuration of blue light module 18 in this embodiment will be described. Fig. 6 is a diagram showing a schematic configuration of blue light module 18 according to embodiment 1. Fig. 6 shows a schematic configuration of one board 180 in blue light module 18, but the configuration of the other board 180 is similar to that shown in Fig. 6. As shown in Fig. 6, a plurality of third light sources 181, a plurality of fourth light sources 182, and a plurality of fifth light sources 183, each having a different color temperature, are arranged on board 180 of blue light module 18.

[0042] The third light source 181 is, for example, a white LED having a color temperature of 5000 (K) and a forward voltage of 6 V. The fourth light source 182 is, for example, a blue LED having a dominant wavelength of 440 to 480 nm and a forward voltage of 3 V. The fifth light source 183 is, for example, a green LED having a dominant wavelength of 510 to 570 nm and a forward voltage of 3 V. The third light source 181 has a higher forward voltage than the fourth light source 182 and the fifth light source 183, and emits light brighter than the fourth light source 182 and the fifth light source 183 when the same current flows. That is, the output balance of each light source in the blue light module 18 is third light source 181>fourth light source 182>fifth light source 183.

[0043] In this embodiment, by mixing the light emitted from the third light source 181, the fourth light source 182, and the fifth light source 183, which have different light emission colors, it is possible to obtain illumination of an intended light color from the light guide plate 17. In this embodiment, light of the color of the sky, particularly the color of a blue sky, is emitted from the light guide plate 17. In the following description, the first light source 141 to the fifth light source 183 may be collectively referred to as the "light source".

[0044] The arrangement of the third light source 181, the fourth light source 182, and the fifth light source 183 on the substrate 180 is not limited to the example of FIG. 6. For example, the third light source 181, the fourth light source 182, and the fifth light source 183 may be arranged in a region below 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 light from the light guide plate 17 and the light from the diffusion cover 13 can be emitted close to each other. The third light source 181, the fourth light source 182, and the fifth light source 183 may be arranged with their positions shifted in the vertical direction. The arrangement of the third light source 181, the fourth light source 182, and the fifth light source 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 third light source 181, the fourth light source 182, and the fifth light source 183 to the total number of LEDs in the blue light module 18 is 2:2:1.

[0045] A plurality of through holes 18-1 are provided in the upper part of the substrate 180 of the blue light module 18. The through hole 18-1 (not shown) provided in the central part of the substrate 180 is circular, and the other through holes 18-1 are oval extending in the longitudinal direction. The substrate 180 of the blue light module 18 thermally expands and contracts due to heat emitted from the third light source 181, the fourth light source 182, and the fifth light source 183. Therefore, when the blue light module 18 is fixed to the holder 24, the substrate 180 of the blue light module 18 may be warped or distorted due to the thermal expansion and contraction.

[0046] Therefore, in this embodiment, an elliptical through hole 18-1 is provided in the substrate 180, and the protrusion 25-1 of the fixing member 25 can be inserted into the through hole 18-1 with some play. This allows the protrusion 25-1 to move in the longitudinal direction within the elliptical through hole 18-1 even when the substrate 180 of the blue light module 18 thermally expands and contracts, and warping or distortion of the substrate 180 can be suppressed.

[0047] 7 is a control block diagram of lighting fixture 1 according to embodiment 1. Lighting fixture 1 includes switch 31 connected to a commercial power source, input filter 32, PFC (Power Factor Correction) circuit 33, and control device 4. Lighting fixture 1 also includes a first drive unit 71, a second drive unit 72, a third drive unit 73, a fourth drive unit 74, a fifth drive unit 75, a sixth drive unit 76, a seventh drive unit 77, an eighth drive unit 78, and a ninth drive unit 79, which are connected to PFC circuit 33 and control device 4.

[0048] The switch 31 turns the power supply to the lighting fixture 1 on and off. The input filter 32 is connected to the anode and the cathode of the commercial power supply via the switch 31. The PFC circuit 33 is connected to the anode and the anode of the input filter 32. The first drive unit 71 to the ninth drive unit 79 are connected to the anode and the anode of the PFC circuit 33.

[0049] The control device 4 controls the lighting of the lighting fixture 1, and is configured with a circuit device such as an FPGA (Field-Programmable Gate Array) that realizes the function, or a calculation device such as a microcomputer or CPU, memory, and software executed thereon. The control device 4 transmits dimming signals (PWM signals, UART signals, etc.) to the first drive unit 71 to the ninth drive unit 79, and controls the output currents of the first drive unit 71 to the ninth drive unit 79 to control the dimming rate of each light source.

[0050] The first drive unit 71 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the first light source 141 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2. The second drive unit 72 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the second light source 142 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2.

[0051] The third drive unit 73 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the first light source 141 of the third light-emitting unit 140-3. The fourth drive unit 74 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the second light source 142 of the third light-emitting unit 140-3.

[0052] The fifth drive unit 75 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the first light source 141 of the fourth light-emitting unit 140-4. The sixth drive unit 76 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the second light source 142 of the fourth light-emitting unit 140-4.

[0053] The seventh drive unit 77 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the third light source 181. The eighth drive unit 78 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the fourth light source 182. The ninth drive unit 79 converts the current supplied from the power supply through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal transmitted from the control device 4, and supplies the converted current to the fifth light source 183.

[0054] Control device 4 has a timer (not shown) and controls first driving unit 71 to ninth driving unit 79 according to the time, thereby controlling the light emission of white light module 14 and blue light module 18. First, the control of blue light module 18 by control device 4 will be described.

[0055] FIG. 8 is a graph showing the amount of light of the blue light module 18 according to the first embodiment. The horizontal axis of FIG. 8 shows the time, and the vertical axis shows the amount of light of the blue light module 18. The amount of light of the blue light module 18 according to the present embodiment is changed according to the time. In detail, as shown in FIG. 8, for example, the amount of light from 8:00 to 16:00 (daytime) is set to 100%, the amount of light from 6:00 to 8:00 (sunrise and morning) and from 16:00 to 18:00 (evening and sunset) is set to 50%, and the amount of light from 18:00 to 6:00 (night) 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. The amount of light at each time may be changed according to the season. For example, in the case of summer, the daytime period during which the amount of light of the blue light module 18 is set to 100% may be longer than in the case of winter. In addition to the amount of light, the chromaticity of the blue light module 18 may be changed according to the season.

[0056] Fig. 9 is a graph for explaining dimming control of blue light module 18 according to embodiment 1. The horizontal axis of Fig. 9 indicates time, and the vertical axis indicates the duty ratio of the dimming signal. Moreover, the solid line in Fig. 9 indicates the duty ratio of the dimming signal input to seventh driving unit 77 and eighth driving unit 78, and the dashed line indicates the duty ratio of the dimming signal input to ninth driving unit 79. As shown in Fig. 9, control device 4 sets the duty ratio of the dimming signals input to seventh driving unit 77 to ninth driving unit 79 during the daytime (8:00 to 16:00) to 1.

[0057] Then, in the evening (for example, 4 p.m.), the control device 4 reduces the duty ratio of the dimming signal to the seventh driving unit 77 and the eighth driving unit 78 to 0.2 at a preset first reduction rate. The control device 4 also reduces the duty ratio of the dimming signal to the ninth driving unit 79 to 0.2 at a second reduction rate that is greater than the first reduction rate. As a result, first the amount of green light emitted from the fifth light source 183 decreases to 20%, and then the amount of white light and blue light emitted from the third light source 181 and the fourth light source 182 decrease to 20%.

[0058] At dawn, the opposite control to that in the evening is performed. Specifically, first, the control device 4 increases the duty ratio of the dimming signal to the seventh driving unit 77 and the eighth driving unit 78 to 1 at a preset first increase rate. Then, after a predetermined time has passed (for example, at 6:00), the control device 4 increases the duty ratio of the dimming signal to the ninth driving unit 79 to 1 at a second increase rate that is greater than the first increase rate.

[0059] By carrying out such control, the amount of green light is first reduced in the evening, followed by the amount of white light and blue light, thereby changing the light from the light guide plate 17 to a deep purplish blue, just like natural light.

[0060] Next, the control of the white light module 14 by the control device 4 will be described. FIG. 10 is a diagram showing an example of installation of the lighting fixture 1 according to the first embodiment. FIG. 10 is a plan view of the lighting fixture 1 installed on the ceiling C, seen from below. For the purpose of explanation, the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4 of the white light module 14 are shown by dashed lines. As shown in FIG. 10, the lighting fixture 1 is installed so that the first light-emitting unit 140-1 of the white light module 14 is located to the north, the second light-emitting unit 140-2 is located to the south, the third light-emitting unit 140-3 is located to the east, and the fourth light-emitting unit 140-4 is located to the west. The control of the white light module 14 when the lighting fixture 1 is installed as shown in FIG. 10 will be described below.

[0061] FIG. 11 is a diagram showing the lighting modes of the white light module 14 according to the first embodiment for each time period. In this embodiment, the control device 4 performs the same control on the first light-emitting unit 140-1 and the second light-emitting unit 140-2. That is, the lighting modes of the first light source 141 in the first light-emitting unit 140-1 and the second light-emitting unit 140-2 are the same, and the lighting modes of the second light source 142 in the first light-emitting unit 140-1 and the second light-emitting unit 140-2 are the same. As shown in FIG. 11, the control device 4 turns on the second light source 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the third light-emitting unit 140-3 during the sunrise time period (for example, from 6:00 to 7:00), and turns off the other light sources. Furthermore, the control device 4 sets the light intensity of the second light source 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the third light-emitting unit 140-3 during the sunrise period to a preset light intensity (for example, 60%). This causes warm white light to be emitted from three directions, the light-emitting surface 130-1 located in the north of the diffusion cover 13, the light-emitting surface 130-2 located in the south, and the light-emitting surface 130-3 located in the east. As a result, it is possible to reproduce the light of sunrise irradiated from the east.

[0062] The control device 4 turns on the second light sources 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the third light-emitting unit 140-3 during the morning time period (for example, from 7:00 to 8:00), and turns off the other light sources. The control device 4 also sets the light amount of the second light sources 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the third light-emitting unit 140-3 during the morning time period to a light amount (for example, 100%) greater than that during the sunrise time period. As a result, warm white light that is brighter than that during the sunrise time period is irradiated from three directions, the light-emitting surface 130-1 located in the north of the diffusion cover 13, the light-emitting surface 130-2 located in the south, and the light-emitting surface 130-3 located in the east. As a result, the morning sunlight irradiated from the east can be reproduced.

[0063] The control device 4 turns on the first light sources 141 of the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4 during the daytime (for example, from 8:00 to 16:00) and turns off the second light sources 142 of the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4. The control device 4 also sets the light intensity of the first light sources 141 of the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4 during the daytime to a preset light intensity (for example, 100%). This causes bright white light with a cool color to be emitted from each light-emitting surface 130 located to the north, south, east and west. As a result, it is possible to reproduce the light of the daytime sun shining down from directly above.

[0064] The control device 4 turns on the second light sources 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the fourth light-emitting unit 140-4 during the evening hours (for example, from 4:00 p.m. to 5:00 p.m.), and turns off the other light sources. The control device 4 also sets the light amounts of the second light sources 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the fourth light-emitting unit 140-4 during the evening hours to a preset light amount (for example, 100%). As a result, warm white light is irradiated from three directions, the light-emitting surface 130-1 located in the north of the diffusion cover 13, the light-emitting surface 130-2 located in the south, and the light-emitting surface 130-4 located in the west. As a result, it is possible to reproduce the light of the evening sun irradiated from the west.

[0065] During the sunset time period (for example, from 17:00 to 18:00), the control device 4 turns on the second light sources 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the fourth light-emitting unit 140-4, and turns off the other light sources. In addition, the control device 4 sets the light intensity of the second light sources 142 of the first light-emitting unit 140-1, the second light-emitting unit 140-2, and the fourth light-emitting unit 140-4 during the sunset time period to a light intensity (for example, 60%) smaller than that during the evening time period. As a result, warm white light that is darker than that during the evening time period is irradiated from three directions, the light-emitting surface 130-1 located in the north of the diffusion cover 13, the light-emitting surface 130-2 located in the south, and the light-emitting surface 130-4 located in the west. As a result, the light of the sunset irradiated from the west can be reproduced.

[0066] During the nighttime hours (e.g., from 6 pm to 6 am), the control device 4 turns on only the second light sources 142 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2 to ensure a minimum level of brightness for illumination. Furthermore, the control device 4 sets the light intensity of the second light sources 142 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2 during the nighttime hours to a lower light intensity (e.g., 10%) than during the sunset hours.

[0067] The above-mentioned time periods, light amounts, and lighting modes are merely examples and may be changed as appropriate. For example, the light sources that are "off" in FIG. 11 may be dimmed so that the light amount is smaller than that of light sources that are "on" rather than "off". The light amount in each time period may be changed according to the season. For example, if it is summer, the times of sunset, morning, evening, and sunrise may be changed, and the daytime hours may be longer than in winter. Also, not only the light amount but also the chromaticity of the white light module 14 may be changed according to the season.

[0068] As described above, in the lighting device 1 of the present embodiment, blue light reproducing 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 the diffusion cover 13 surrounding the light guide plate 17. This makes it possible to produce a visual effect with a sense of depth, as if one were looking at a blue sky through a window frame in the sun or shade lit by sunlight. In addition, blue light whose chromaticity changes in the same way as natural light can be emitted from the blue light module 18, and the reproducibility of the color of the sky can be improved. Furthermore, by changing the direction, light quantity, and color temperature of the white light emitted from the diffusion cover 13 according to the time of day, the naturally changing light of the sun can be reproduced, and the reproducibility of the sky seen through a window can be improved.

[0069] Embodiment 2 A second embodiment will be described. The second embodiment differs from the first embodiment in the control of the white light module 14 in the lighting device 1. The configuration of the lighting device 1 is the same as that of the first embodiment. The second embodiment differs from the first embodiment in that the light intensity of each light source of the white light module 14 is continuously changed.

[0070] FIG. 12 is a diagram showing dimming control of the first light emitter 140-1 and the second light emitter 140-2 of the white light module 14 according to the second embodiment. The vertical axis of FIG. 12 indicates the dimming rate, and the horizontal axis indicates the time period. The solid line in FIG. 12 indicates the dimming rate of the first light source 141 of the first light emitter 140-1 and the second light emitter 140-2, and the dashed line indicates the dimming rate of the second light source 142 of the first light emitter 140-1 and the second light emitter 140-2. As in the first embodiment, the first light source 141 has the same lighting mode in the first light emitter 140-1 and the second light emitter 140-2. The second light source 142 has the same lighting mode in the first light emitter 140-1 and the second light emitter 140-2.

[0071] With reference to FIG. 12, the control of the first light source 141 and the second light source 142 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2 will be described. The control device 4 turns on the second light source 142 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2 at a preset constant dimming rate (for example, 10%) during the time period from night to sunrise. Then, the control device 4 continuously and gradually increases the dimming rate of the second light source 142 at sunrise, and sets the dimming rate of the second light source 142 to 100% at morning. Thereafter, the control device 4 reduces the dimming rate of the second light source 142 and turns off the second light source 142 at time t1, which is later than morning and before noon. Then, the control device 4 turns on the second light source 142 again at time t2 after noon but before evening, and thereafter continuously and gradually increases the dimming rate, so that the dimming rate of the second light source 142 is 100% at evening. After evening, the control device 4 continuously and gradually decreases the dimming rate of the second light source 142, so that the dimming rate of the second light source 142 is a preset constant dimming rate (e.g., 10%) at sunset.

[0072] Furthermore, the control device 4 turns off the first light source 141 of the first light-emitting unit 140-1 and the second light-emitting unit 140-2 from evening to morning. Then, the control device 4 turns on the first light source 141 when it becomes morning, and then continuously gradually increases the dimming rate of the first light source 141 until the dimming rate of the first light source 141 becomes 100% at noon. After that, the control device 4 decreases the dimming rate of the first light source 141, and turns off the first light source 141 in the evening.

[0073] Fig. 13 is a diagram showing dimming control of the third light-emitting unit 140-3 of the white light module 14 according to the second embodiment. The vertical axis of Fig. 13 indicates the dimming rate, and the horizontal axis indicates the time period. The solid line in Fig. 13 indicates the dimming rate of the first light source 141 of the third light-emitting unit 140-3, and the dashed line indicates the dimming rate of the second light source 142 of the third light-emitting unit 140-3.

[0074] 13, the control of the first light source 141 and the second light source 142 of the third light-emitting unit 140-3 will be described. At sunrise, the control device 4 turns on the second light source 142 of the third light-emitting unit 140-3. After that, the control device 4 continuously and gradually increases the dimming rate of the second light source 142, and sets the dimming rate of the second light source 142 to 100% in the morning. After that, the control device 4 decreases the dimming rate of the second light source 142, and turns off the second light source 142 at time t1 before noon.

[0075] Furthermore, when it becomes morning, the control device 4 turns on the first light source 141 of the third light-emitting unit 140-3. After that, the control device 4 continuously and gradually increases the dimming rate of the first light source 141, and sets the dimming rate of the first light source 141 to 100% at noon. After that, the control device 4 decreases the dimming rate of the first light source 141, and turns off the first light source 141 at time t2, which is after noon and before evening.

[0076] Fig. 14 is a diagram showing dimming control of the fourth light-emitting unit 140-4 of the white light module 14 according to the second embodiment. The vertical axis of Fig. 14 indicates the dimming rate, and the horizontal axis indicates the time period. The solid line in Fig. 14 indicates the dimming rate of the first light source 141 of the fourth light-emitting unit 140-4, and the dashed line indicates the dimming rate of the second light source 142 of the fourth light-emitting unit 140-4.

[0077] The control of the first light source 141 and the second light source 142 of the fourth light-emitting unit 140-4 will be described with reference to Fig. 14. At time t1, which is later than morning and earlier than noon, the control device 4 turns on the first light source 141 of the fourth light-emitting unit 140-4. After that, the control device 4 continuously and gradually increases the dimming rate of the first light source 141, and sets the dimming rate of the first light source 141 to 100% at noon. After that, the control device 4 decreases the dimming rate of the first light source 141, and turns off the first light source 141 in the evening.

[0078] Furthermore, at time t2, which is after noon but before evening, the control device 4 turns on the second light source 142 of the fourth light-emitting unit 140-4. After that, the control device 4 continuously and gradually increases the dimming rate of the second light source 142, and sets the dimming rate of the second light source 142 to 100% at evening. After that, the control device 4 decreases the dimming rate of the second light source 142, and turns off the second light source 142 at sunset.

[0079] By controlling the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4 as described above, it is possible to reproduce the sunlight shining from the east at sunrise and in the morning, the sunlight shining from directly above at midday, and the sunlight shining from the west at evening and sunset. In addition, by continuously changing the dimming rate of each light source of the first light-emitting unit 140-1 to the fourth light-emitting unit 140-4, it is possible to reproduce the natural sunlight that changes over time, and the degree of reproduction of the sky seen through a window can be further improved.

[0080] The lighting device 1 of the present disclosure is not limited to the above-mentioned embodiment, and can be modified in various ways. The lighting device 1 of the present disclosure includes all combinations of the possible configurations among the configurations shown in the following embodiments. For example, in the above-mentioned embodiment, the blue light module 18 is configured to have three types of light sources with different emission colors, but the present disclosure is not limited to this, and may have multiple light sources with different emission colors. The light irradiated from the diffusion cover 13 and the light guide plate 17 is not limited to white and blue, and each light source can be a light source of any emission color.

[0081] Furthermore, in the above embodiment, the lighting fixture 1 is described on the assumption that it is attached to the ceiling C, but the lighting fixture 1 may be installed on a wall in a room. In this case, the control device 4 turns on the light-emitting unit 140 arranged in the east and the second light source 142 of the light-emitting unit 140 arranged above at sunset and in the morning, and turns off or dims the light-emitting unit 140 arranged in the west. In addition, the control device 4 turns on the light-emitting unit 140 arranged in the east, the light-emitting unit 140 arranged above, and the first light source 141 of the light-emitting unit 140 arranged in the west at daytime. In addition, the control device 4 turns on the light-emitting unit 140 arranged in the west and the second light source 142 of the light-emitting unit 140 arranged above at dusk and sunset, and turns off or dims the light-emitting unit 140 arranged in the east. Note that the control device 4 may control each light-emitting unit 140 according to the time of day, regardless of the direction in which each light-emitting unit 140 is arranged.

[0082] In the above embodiment, the shape of the lighting device 1 is likened to a rectangular window, and the shapes of the light guide plate 17 and the diffusion cover 13 are rectangular, but this is not limited to the above. The shapes of the light guide plate 17 and the diffusion cover 13 may be rectangular other than rectangular, or may be non-rectangular such as circular or trapezoidal. In this case, the multiple light emitting units 140 only need to be arranged around the light guide plate 17, and the shapes and number of the light emitting units 140 are not limited to those in the above embodiment. [Explanation of symbols]

[0083] 1 lighting fixture, 4 control device, 10 light source unit, 11 flange portion, 12 V spring, 13 diffusion cover, 14 white light module, 15 holding portion, 15-1 mounting flange, 16 lower guide plate, 16-3 protrusion portion, 17 light guide plate, 17-1 end face, 17-2 end face, 18 blue light module, 18-1 through hole, 19 upper guide plate, 21 packing, 22 packing, 23 insulating portion, 24 holding portion, 25 fixing member, 25-1 protrusion portion, 26 light guide plate cover, 27 upper cover, 30 power supply unit, 31 switch, 32 input filter, 33 PFC circuit, 50 fixture body, 51 main surface, 51-1 bolt hole, 51-2 wire hole, 52 side, 53 mounting bracket, 54 terminal block, 61 nut, 71 First drive unit, 72 second drive unit, 73 third drive unit, 74 fourth drive unit, 75 fifth drive unit, 76 sixth drive unit, 77 seventh drive unit, 78 eighth drive unit, 79 ninth drive unit, 130-1, 130-2, 130-3, 130-4 light-emitting surface, 140-1 first light-emitting unit, 140-2 second light-emitting unit, 140-3 third light-emitting unit, 140-4 fourth light-emitting unit, 141 first light source, 142 second light source, 143 board, 180 board, 181 third light source, 182 fourth light source, 183 fifth light source, B hanging bolt, C ceiling, H recessed hole.

Claims

1. A blue light module having a plurality of light sources with different emission colors; a light guide plate that diffuses the light from the blue light module and emits the light from the light guide plate; a white light module having a plurality of light emitting units arranged around the light guide plate; a diffusion cover for emitting light from the white light module; a control device that controls the lighting state of the plurality of light-emitting units of the white light module according to time, The plurality of light-emitting units include a third light-emitting unit and a fourth light-emitting unit disposed so as to sandwich the light guide plate, The third light-emitting unit and the fourth light-emitting unit each have at least a second light source of a warm color system, The control device, when the time is sunrise, morning, evening or sunset, turns off or dims the second light source in either the third light-emitting unit or the fourth light-emitting unit, and lights up the second light source in the other of the third light-emitting unit or the fourth light-emitting unit brighter than the second light source in the one of the third light-emitting unit or the fourth light-emitting unit.

2. the plurality of light-emitting sections include a first light-emitting section, a second light-emitting section, the third light-emitting section, and the fourth light-emitting section, which are arranged in a rectangular shape; the first light emitting unit and the second light emitting unit are disposed opposite each other, and the third light emitting unit and the fourth light emitting unit are disposed opposite each other, The control device includes: When the third light emitting unit is turned on, the fourth light emitting unit is turned off or dimmed. The lighting device according to claim 1 , wherein when the fourth light-emitting unit is turned on, the third light-emitting unit is turned off or dimmed.

3. The control device includes: The lighting device according to claim 2 , wherein the first light-emitting unit and the second light-emitting unit are controlled in the same manner.

4. Each of the light-emitting units has a first light source of a cool color system and a second light source of a warm color system, The control device includes: When the time is a time period of sunrise, morning, evening, or sunset, the second light source of the first light-emitting unit and the second light-emitting unit is turned on, and the first light source of the first light-emitting unit and the second light-emitting unit is turned off or dimmed; 4. The lighting device according to claim 2 or 3, wherein, when the time is in the daytime hours, the first light source of the first light-emitting unit and the second light-emitting unit is turned on, and the second light source of the first light-emitting unit and the second light-emitting unit is turned off or dimmed.

5. The control device includes: The lighting fixture according to any one of claims 1 to 4, wherein the dimming ratios of the plurality of light-emitting parts are continuously changed according to the time.

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