JP7664762B2 - Lighting fixtures - Google Patents

Description

This disclosure relates to a lighting fixture having multiple light sources.

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 is configured to reproduce the appearance of the sky by controlling the emission of blue light, yellow light, orange light, red light, and white light.

JP 2019-102166 A

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

The present disclosure aims to solve the problems described above and provide a lighting fixture that can improve the reproduction of the sky seen through a window.

The lighting device according to the present disclosure comprises a blue light module having multiple light sources differing in light emission color, a light guide plate that diffuses the light of the blue light module to emit surface light, a white light module having multiple 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 lighting state of the multiple light-emitting units of the white light module according to the time , wherein the multiple light-emitting units have a third light-emitting unit and a fourth light-emitting unit arranged to sandwich the 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 when the time is sunrise, morning, evening or sunset, the control device 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 other of the third light-emitting unit or the fourth light-emitting unit .

The lighting fixture according to the present disclosure can reproduce the sunlight around a window by controlling multiple light-emitting elements arranged around a light guide plate according to the time of day, improving the reproduction of the sky seen through the window.

1 is a perspective view showing the appearance of a lighting fixture according to a first embodiment; 1 is an exploded perspective view showing a configuration of a lighting fixture according to a first embodiment. FIG. 1 is an exploded perspective view showing a configuration of a light source unit of a lighting fixture according to a first embodiment. FIG. 1 is an exploded perspective view showing a configuration of a light source unit of a lighting fixture according to a first embodiment. FIG. 1 is a schematic cross-sectional view showing a configuration of a lighting device according to a first embodiment. 1 is a diagram showing a schematic configuration of a blue light module according to a first embodiment; FIG. 2 is a control block diagram of the lighting fixture according to the first embodiment. 4 is a graph showing the amount of light emitted by the blue light module according to the first embodiment. 4 is a graph illustrating dimming control of the blue light module according to the first embodiment. 1 is a diagram showing an example of installation of a lighting fixture according to a first embodiment; 5 is a diagram showing lighting modes for different time periods of the white light module according to the first embodiment; FIG. 13A and 13B are diagrams illustrating dimming control of a first light-emitting unit and a second light-emitting unit of a white light module according to a second embodiment. 13A and 13B are diagrams illustrating dimming control of a third light-emitting unit of a white light module according to a second embodiment. 13A and 13B are diagrams illustrating dimming control of a fourth light-emitting unit of the white light module according to the second embodiment.

Below, 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 the same 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 "downward direction", and the floor side will be referred to as the "lower side". Note that in each drawing, the relative dimensional relationships or shapes of each component may differ from the actual ones.

Embodiment 1.
Fig. 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 that irradiates light, and a light guide plate 17.

Figure 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 Figure 2, the 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.

A V-spring mounting bracket 53 is attached to the inner surfaces of two opposing side surfaces 52 of the four side surfaces 52 of the fixture body 50. 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. A hanging bolt B is hung from an embedded 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.

In addition, the main surface 51 has 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. The power terminal block and the signal line terminal block are not shown in FIG. 2. Electric wires and signal lines are drawn out from the wire holes 51-2. The wires drawn out from the wire holes 51-2 are electrically connected to the power terminal block of the terminal block 54. In addition, the signal lines drawn out from the wire holes 51-2 are electrically connected to the signal line terminal block of the terminal block 54.

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-spring 12, a diffusion cover 13, and a light guide plate 17. The upper cover 27 is formed into a truncated 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. The flange portion 11 is disposed so as to protrude horizontally outward from the lower end of the upper cover 27, as shown in FIG. 2.

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 to match 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, so that the light source unit 10 is suspended and held by 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.

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

First, the components of the light source unit 10 shown in FIG. 3 will be described. 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 holding portion 15.

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.

The holding portion 15 is formed into a rectangular frame shape in a plan view. The holding portion 15 is constructed by combining four members. Each of the four members has an L-shaped cross section, as shown in FIG. 5 described below. 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.

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°. Additionally, the angle between the second light-emitting unit 140-2 and the third light-emitting unit 140-3, and the angle between the second light-emitting unit 140-2 and the fourth light-emitting unit 140-4 are 90°. In the following description, 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 may be collectively referred to as the "light-emitting unit 140."

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 number of first light sources 141 and 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 with 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.

The first light source 141 is, for example, a cool white LED with a color temperature of 4000 to 5000 (K). The second light source 142 is, for example, a warm white LED with 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 in pairs on the board 143. 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 by one.

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

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 below from entering the upper end face of the diffusion cover 13 from the emission face of the light guide plate 17. The packing 22 also blocks white light emitted from the white light module 14 from entering the emission face of the light guide plate 17 from the upper end face of the diffusion cover 13. Furthermore, the packing 22 also functions as a cushioning material when the lighting device 1 is shaken by an earthquake or the like.

The diffusion cover 13 is made of, for example, white resin, and is formed into 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.

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 the light-emitting surface 130-1, and the side surface disposed in front of the second light-emitting unit 140-2 is the light-emitting surface 130-2. Also, 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 the light-emitting surface 130-3, and the side surface disposed in front of the fourth light-emitting unit 140-4 is 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. Because each side of the diffusion cover 13 is inclined, the white light emitted from the front surface of the light-emitting surface 130 is irradiated diagonally downward.

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 a plan view. The packing 21 prevents the flange portion 11 or the diffusion cover 13 from directly colliding with each other when the flange portion 11 or the diffusion cover 13 vibrates. 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, it is possible to give the impression of a window frame. In particular, when the packing 21 is a white-based color tone, the impression of a window frame can be strengthened. The packing 21 also functions as a light-shielding part that prevents white light from leaking from the gap between the diffusion cover 13 and the flange portion 11.

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.

The lower guide plate 16 is placed on the holding portion 15 shown in FIG. 3. The lower guide plate 16 is composed of two rod-shaped members, and is arranged 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 that make up the lower guide plate 16. Protrusions 16-3 extend vertically upward. Protrusions 16-3 come into contact with end face 17-2 extending in the short direction of the light guide plate 17, and restrict movement of the light guide plate 17 in the longitudinal direction.

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 arranged along the end of the light guide plate 17 extending in the longitudinal direction.

The light guide plate 17 is formed into a rectangular plate 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 scatterer, 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.

The upper surface of the light guide plate 17 is smooth to allow for total reflection. It is preferable that the upper surface of the light guide plate 17 has a mirror finish. If the upper surface of the light guide plate 17 is scratched during the assembly of the lighting fixture 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 on the upper surface will appear to shine whitishly. Therefore, in order to prevent the upper surface of the light guide plate 17 from being scratched, the upper surface of the light guide plate 17 may be covered with a reflective sheet (not shown).

The blue light module 18 is arranged so as to be parallel to the end face 17-1 extending in the longitudinal direction of the light guide plate 17. The blue light module 18 comprises two substrates 180 and a number of light sources arranged on each of the substrates 180. A number of through holes 18-1 are provided in the upper part of the substrates 180. The configuration and dimming control of the blue light module 18 will be described in detail later.

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 in 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.

The holding portion 24 is formed from a metal sheet having an L-shaped cross section. The holding portion 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 portion 24 is attached to the upper surface of the holding portion 15 shown in FIG. 3. The blue light module 18 is attached to the holding portion 24 via an insulating portion 23. Note that if the substrate 180 of the blue light module 18 is not a double-sided substrate, the insulating portion 23 may be omitted.

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 Figures 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 (Figure 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.

Figure 5 is a schematic cross-sectional view showing the configuration of lighting fixture 1 according to embodiment 1. Figure 5 shows a schematic cross-section of lighting fixture 1 cut at the center in the longitudinal direction along a plane parallel to one side in the lateral direction.

As shown in FIG. 5, the light source unit 10 is placed in the opening at the bottom end of the fixture 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 hooked state on a V-spring mounting bracket 53 provided on the fixture body 50. This engages the light source unit 10 and the fixture body 50, and the light source unit 10 is held in the fixture body 50.

The white light module 14 is held by the holding section 15 and is 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 holding section 24 fixed to the upper surface of the holding section 15 and disposed so as to face the 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 diagonally downward from the light guide plate 17.

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. Because 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 a diagonally 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 through the light guide plate 17 while being totally reflected by the upper and lower surfaces of the light guide plate 17. A portion of the light traveling through the light guide plate 17 hits a scatterer in the light guide plate 17 and is diffused, and is emitted from the lower surface of the light guide plate 17.

Next, the configuration of the blue light module 18 in this embodiment will be described. FIG. 6 is a diagram showing a schematic configuration of the blue light module 18 according to the first embodiment. FIG. 6 shows a schematic configuration of one board 180 in the 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 the board 180 of the blue light module 18.

The third light source 181 is, for example, a white LED with a color temperature of 5000 (K) and a forward voltage of 6 V. The fourth light source 182 is, for example, a blue LED with 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 with 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. In other words, 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.

In this embodiment, 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, is mixed together to obtain illumination of the intended light color from the light guide plate 17. In this embodiment, light that has 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".

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 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 light from the light guide plate 17 and the light from the diffusion cover 13 can be emitted in close proximity to each other. The third light source 181, the fourth light source 182, and the fifth light source 183 may be arranged with their vertical positions shifted. 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.

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 shapes 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 holding portion 24, the substrate 180 of the blue light module 18 may warp or distort due to thermal expansion and contraction.

In this embodiment, therefore, 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 longitudinally within the elliptical through hole 18-1 even when the substrate 180 of the blue light module 18 thermally expands and contracts, thereby suppressing warping or distortion of the substrate 180.

Figure 7 is a control block diagram of the lighting fixture 1 according to the first embodiment. The lighting fixture 1 includes a switch 31 connected to a commercial power source, an input filter 32, a PFC (Power Factor Correction) circuit 33, and a control device 4. The 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 the PFC circuit 33 and the control device 4.

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 cathode of the commercial power supply via the switch 31. The PFC circuit 33 is connected to the anode and anode of the input filter 32. The first drive unit 71 to the ninth drive unit 79 are connected to the anode and anode of the PFC circuit 33.

The control device 4 controls the lighting of the lighting fixture 1, and is composed of a circuit device such as an FPGA (Field-Programmable Gate Array) that realizes this function, or a calculation device such as a microcomputer or CPU, memory, and software executed on it. 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 dimming rate of each light source by controlling the output current of the first drive unit 71 to the ninth drive unit 79.

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

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

The fifth drive unit 75 converts the current supplied from the power source through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal sent from the control device 4, and supplies it 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 source through the input filter 32 and the PFC circuit 33 in accordance with the dimming signal sent from the control device 4, and supplies it to the second light source 142 of the fourth light-emitting unit 140-4.

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

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

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 also be changed according to the season. For example, in the case of summer, the daytime hours 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 also be changed according to the season.

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

Then, in the evening (for example, 4 p.m.), the control device 4 reduces the duty ratio of the dimming signal to the seventh drive unit 77 and the eighth drive 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 drive 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%.

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 drive unit 77 and the eighth drive unit 78 to 1 at a preset first increase rate. Then, after a predetermined time has passed (for example, 6:00), the control device 4 increases the duty ratio of the dimming signal to the ninth drive unit 79 to 1 at a second increase rate that is greater than the first increase rate.

By performing this type of control, the amount of green light decreases first in the evening, followed by a decrease in the amount of white light and blue light, changing the light from the light guide plate 17 to a deep purplish blue, just like natural light.

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 the 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, viewed 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. Below, the control of the white light module 14 when the lighting fixture 1 is installed as shown in FIG. 10 will be described.

Figure 11 is a diagram showing the lighting modes for each time period of the white light module 14 according to the first embodiment. 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 Figure 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 to the north of the diffusion cover 13, the light-emitting surface 130-2 located to the south, and the light-emitting surface 130-3 located to the east. As a result, it is possible to reproduce the light of sunrise irradiated from the east.

During the morning hours (e.g., from 7:00 to 8:00), 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 third light-emitting unit 140-3, and turns off the other light sources. The control device 4 also 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 third light-emitting unit 140-3 during the morning hours to a light intensity greater than that during the sunrise hours (e.g., 100%). As a result, a warm white light that is brighter than that during the sunrise hours is irradiated from three directions, the light-emitting surface 130-1 located to the north of the diffusion cover 13, the light-emitting surface 130-2 located to the south, and the light-emitting surface 130-3 located to the east. As a result, the morning sunlight irradiated from the east can be reproduced.

During the daytime hours (e.g., from 8:00 to 16:00), 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 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 hours to a preset light intensity (e.g., 100%). This causes bright, cool white light 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 daytime sunlight shining down from directly above.

During the evening hours (e.g., 4:00 p.m. to 5:00 p.m.), 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. The control device 4 also 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 evening hours to a preset light intensity (e.g., 100%). As a result, warm white light is emitted from three directions, the light-emitting surface 130-1 located to the north of the diffusion cover 13, the light-emitting surface 130-2 located to the south, and the light-emitting surface 130-4 located to the west. As a result, it is possible to reproduce the light of the evening sun shining from the west.

During the sunset time period (for example, from 5:00 p.m. to 6:00 p.m.), 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. The control device 4 also 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 lower light intensity (for example, 60%) than during the evening time period. As a result, warm white light that is darker than during the evening time period is irradiated from three directions, the light-emitting surface 130-1 located to the north of the diffusion cover 13, the light-emitting surface 130-2 located to the south, and the light-emitting surface 130-4 located to the west. As a result, the light of the setting sun irradiated from the west can be reproduced.

During the nighttime hours (e.g., from 6:00 p.m. to 6:00 a.m.), 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. In addition, 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.

The above-mentioned time periods, light intensity, and lighting modes are merely examples and may be changed as appropriate. For example, the light source that is "off" in FIG. 11 may be dimmed so that the light intensity is less than that of a light source that is "on" rather than "off". The light intensity for each time period may also be changed depending on 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 intensity but also the chromaticity of the white light module 14 may be changed depending on the season.

As described above, in the lighting device 1 of this 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 the diffusion cover 13 surrounding the light guide plate 17. This creates 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, improving the reproduction of the color of the sky. Furthermore, by changing the direction, light quantity, and color temperature of the white light emitted from the diffusion cover 13 depending on the time of day, it is possible to reproduce the naturally changing light of the sun, improving the reproduction of the sky as seen through a window.

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 amount of each light source of the white light module 14 is continuously changed.

Figure 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 Figure 12 indicates the dimming rate, and the horizontal axis indicates the time period. The solid line in Figure 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.

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, which is after noon and before evening, and then 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.

The control device 4 also 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 until morning. When it becomes morning, the control device 4 turns on the first light source 141, and then continuously and 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. The control device 4 then decreases the dimming rate of the first light source 141, and turns off the first light source 141 in the evening.

Figure 13 is a diagram showing the 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 Figure 13 indicates the dimming rate, and the horizontal axis indicates the time period. The solid line in Figure 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.

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 with reference to FIG. 13. When sunrise arrives, 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, which is before noon.

When it is 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.

Figure 14 is a diagram showing the 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 Figure 14 indicates the dimming rate, and the horizontal axis indicates the time period. The solid line in Figure 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.

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. The control device 4 turns on the first light source 141 of the fourth light-emitting unit 140-4 at time t1, which is later than morning and before noon. The control device 4 then continuously and gradually increases the dimming rate of the first light source 141 until the dimming rate of the first light source 141 is 100% at noon. The control device 4 then decreases the dimming rate of the first light source 141 and turns off the first light source 141 in the evening.

The control device 4 also turns on the second light source 142 of the fourth light-emitting unit 140-4 at time t2, which is after noon and before evening. The control device 4 then 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. The control device 4 then decreases the dimming rate of the second light source 142, and turns off the second light source 142 at sunset.

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, further improving the reproduction of the sky as seen through a window.

The lighting device 1 of the present disclosure is not limited to the above-described embodiment, and can be modified in various ways. Furthermore, the lighting device 1 of the present disclosure includes all possible combinations of the configurations shown in the following embodiments. For example, in the above-described embodiment, the blue light module 18 is configured to have three types of light sources with different emission colors, but this is not limited, and it is sufficient that the lighting device 1 has multiple light sources with different emission colors. Furthermore, the light emitted 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.

In addition, in the above embodiment, the lighting fixture 1 is assumed to be attached to the ceiling C, but the lighting fixture 1 may be installed on a wall inside 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 noon. 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.

In addition, in the above-described 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 sections 140 only need to be arranged around the light guide plate 17, and the shape and number of the light-emitting sections 140 are not limited to the examples of the above-described embodiment.

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 Gasket, 22 Gasket, 23 Insulation 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 Suspension bolt, C Ceiling, H Recessed hole.

Claims (5)

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. 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. 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. 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, turning on the second light sources of the first light-emitting unit and the second light-emitting unit, and turning off or dimming the first light sources of the first light-emitting unit and the second light-emitting unit ;
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 . 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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