Lighting fixtures

Abstract

To provide a lighting fixture that achieves a desired light emission color while also possessing a good design. [Solution] The lighting fixture comprises a blue light-emitting unit that emits blue light when powered, a normal light-emitting unit that emits white light when powered, a light guide plate positioned on the side of the blue light-emitting unit and causing Rayleigh scattering of the light emitted from the blue light-emitting unit, and a guide unit that guides the white light emitted from the normal light-emitting unit to the back of the light guide plate and causes the white light to enter from the back side of the light guide plate.

Description

Technical Field

[0001] The present disclosure relates to a lighting fixture to be attached to an attachment portion such as a ceiling.

Background Art

[0002] Conventionally, in lighting fixtures, there is known a type in which the fixture body is embedded and installed on an installation surface such as a ceiling surface, and light from a light source provided in the fixture body is irradiated downward directly from the opening of the fixture body. Patent Document 1 discloses a lighting fixture having a light guide plate including a scatterer for scattering light and a blue LED module for emitting light from the surface of the light guide plate. In the lighting fixture, blue light incident from the side surface of the light guide plate is scattered by the scatterer in the light guide plate, and the light scattered from the front surface of the light guide plate is emitted. In Patent Document 1, a white LED, a blue LED, and a green LED are used as the blue LED module, and the emission of each is controlled to make the front surface of the light guide plate the color of the sky and the back of the light guide plate the color of the blue sky, thereby realizing blue sky lighting.

[0003] As described in Patent Document 1, a lighting fixture has been proposed that simulates the color of a blue sky by emitting light from the side of a light guide plate and scattering the light onto a scatterer. However, some users desire a lighting fixture that not only provides a state in which the light guide plate simulates a blue sky, but also provides a certain level of illumination in a living room as a base light. Patent Document 2 discloses a lighting fixture having a light guide plate containing a scatterer made of particles with a diameter smaller than the wavelength of light, and a light-emitting part that irradiates light from the side of the light guide plate. In this lighting fixture, light incident from the side of the light guide plate is scattered by the scatterer inside the light guide plate, and the scattered light is emitted from the front of the light guide plate. This phenomenon in which light is scattered by fine particles smaller than its own wavelength is called Rayleigh scattering, and when the light guide plate emits blue light, a sense of depth is perceived, and a blue sky is simulated. The light guide plate has the characteristic of easily scattering short wavelength light such as blue or purple. For example, if the light emitted from the light-emitting part is white light, the blue light contained in the white light is easily scattered, while the red light and longer wavelength light such as green light contained in the white light are not easily scattered. In Patent Document 2, a normal illumination part is provided on the back of the light guide plate, and by inducing normal light from the thickness direction of the light guide plate, the light passes through with almost no scattering by the scatterer. As a result, it functions as normal lighting that provides a constant illuminance to the room. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-026799 [Patent Document 2] Japanese Patent Publication No. 2020-194703 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the lighting fixture disclosed in Patent Document 1, if white light used for base lights etc. is to be incident from the side of the light guide plate, the light will appear bluish at positions close to the light source because shorter wavelengths of white light are easily scattered, and reddish at positions far from the light source because longer wavelengths of white light are easily scattered, which may prevent the desired emission color from being obtained. Furthermore, in the lighting fixture disclosed in Patent Document 2, since the light guide plate is transparent, the illumination part is normally visible from the irradiation side, resulting in poor design.

[0006] This disclosure was made to solve the above-mentioned problems and provides a lighting fixture that has good design while obtaining a desired light emission color. [Means for solving the problem]

[0007] The lighting fixture according to this disclosure comprises: a blue light-emitting unit that emits blue light when powered; a normal light-emitting unit that emits white light when powered; a light guide plate positioned on the side of the blue light-emitting unit and causing Rayleigh scattering of the light emitted from the blue light-emitting unit; and a guide unit that guides the white light emitted from the normal light-emitting unit to the back of the light guide plate and causes the white light to enter from the back side of the light guide plate. [Effects of the Invention]

[0008] According to this disclosure, a guide unit is provided that guides white light emitted from the normal light-emitting unit to the back of the light guide plate, and then causes the white light to enter from the back side of the light guide plate. Therefore, even if the light guide plate is transparent, the normal light-emitting unit is difficult to see from the illuminating side. Thus, it is possible to realize a lighting fixture with a good design while obtaining the desired light emission color. [Brief explanation of the drawing]

[0009] [Figure 1] This is an assembled perspective view showing a lighting fixture according to Embodiment 1. [Figure 2] This is an exploded perspective view of the lighting fixture according to Embodiment 1, as seen from above. [Figure 3] This is an exploded perspective view of the lighting fixture according to Embodiment 1, viewed from below. [Figure 4] This is a diagram showing the module holding portion of the lighting fixture according to Embodiment 1. [Figure 5] This is an exploded view showing the module holding part of the lighting fixture according to Embodiment 1. [Figure 6] This is a side view showing a lighting fixture according to Embodiment 1. [Figure 7] This is an enlarged view of a portion of the side view showing a lighting fixture according to Embodiment 1. [Figure 8] This is a schematic diagram showing a lighting fixture according to Embodiment 1. [Figure 9] This is a side view showing a lighting fixture according to Embodiment 2. [Figure 10] This is an enlarged view of a portion of the side view showing a lighting fixture according to Embodiment 2. [Figure 11] This is a schematic diagram showing a lighting fixture according to Embodiment 2. [Figure 12] This is a side view showing a lighting fixture according to Embodiment 3. [Figure 13] This is an enlarged view of a portion of the side view showing a lighting fixture according to Embodiment 3. [Figure 14] This is a schematic diagram showing a lighting fixture according to Embodiment 3. [Figure 15] This is a schematic diagram showing a lighting fixture according to Embodiment 4. [Modes for carrying out the invention]

[0010] The embodiments of the lighting fixtures relating to this disclosure will be described below with reference to the drawings. This disclosure is not limited to the embodiments described below, and can be modified in various ways without departing from the spirit of this disclosure. Furthermore, this disclosure includes all possible combinations of the configurations shown in the embodiments described below. Also, in each drawing, parts denoted by the same reference numerals are the same or equivalent parts, and this is common throughout the entire specification.

[0011] Embodiment 1. FIG. 1 is an assembled perspective view showing a lighting fixture 1 according to Embodiment 1. The lighting fixture 1 is to be attached to an attachment portion such as a ceiling, for example, and irradiates light toward the floor surface side. The lighting fixture 1 is installed by being embedded in an embedding hole provided in the ceiling, for example. As shown in FIG. 1, the lighting fixture 1 includes a fixture main body 10 attached to the attachment portion and a light source unit 20 detachably attached to the fixture main body 10. The light source unit 20 includes a diffusion cover 90 that emits white light and a light guide plate 50 that emits blue light (see FIG. 2). The lighting fixture 1 can provide lighting having a visual effect with a sense of depth as if looking through a window frame by the blue light from the light guide plate 50 and the white light from the diffusion cover 90.

[0012] (Fixture main body 10) FIG. 2 is an exploded perspective view of the lighting fixture 1 according to Embodiment 1 as viewed from above, and FIG. 3 is an exploded perspective view of the lighting fixture 1 according to Embodiment 1 as viewed from below. As shown in FIGS. 2 and 3, the fixture main body 10 is formed in a rectangular box shape with an open lower side. The fixture main body 10 has a main surface 11 and four side surfaces 12. Each of the side surfaces 12 is provided so as to extend vertically downward from each of the four sides of the main surface 11. Among the four side surfaces 12 of the fixture main body 10, V-spring attachment fittings 14 are attached to the inner surfaces of two opposing side surfaces 12. The V-spring attachment fittings 14 hook and hold a V-spring 103, which will be described later, provided on the light source unit 20. Further, bolt holes (not shown) are provided at the four corners of the main surface 11. Further, a suspension bolt (not shown) is suspended from the embedding hole in the ceiling. The fixture main body 10 is fixed to the ceiling by inserting the suspension bolt into the bolt hole and then tightening the suspension bolt with a nut (not shown). Further, a wire hole 13 through which an electric wire and a signal wire are drawn out is formed in the main surface 11.

[0013] (Light source unit 20) The light source unit 20 includes a power supply 21, a normal use light emitting part 30, an induction part 40, a light guide plate 50, a blue light emitting part 60, a white light emitting part 70, a module holding part 80, a diffusion cover 90, and a frame part 100.

[0014] (Power supply 21) The power supply 21 switches the lighting state of the blue light emitting part 60 and the lighting state of the normal use light emitting part 30, and includes a power supply device 22 and a dimming unit 23. The power supply device 22 supplies power to the blue light emitting part 60, the white light emitting part 70, and the normal use light emitting part 30. The dimming unit 23 dims each LED included in the blue light emitting part 60, the white light emitting part 70, and the normal use light emitting part 30.

[0015] (Normal use light emitting part 30) The normal use light emitting part 30 is arranged on the back surface of the light guide plate 50 so as to face the light guide plate 50, and emits light to the back surface of the light guide plate 50. The normal use light emitting part 30 is supplied with power from the power supply device 22 and irradiates white light downward. The normal use light emitting part 30 includes a plate 31, a normal use substrate 32, and a normal use light source ३३. The plate 31 is a rectangular plate arranged above the module holding part 80. The normal use substrate 32 is arranged below the plate 31, and the normal use light source 33 is mounted below. The normal use light source 33 is a plurality of LEDs mounted below the normal use substrate 32. Although it is assumed that white LEDs 72a are used for the normal use light source 33 to function as a base light, other color LEDs may be used for effects.

[0016] (Induction part 40) The guide unit 40 guides the white light emitted from the normal light-emitting unit 30 to the back of the light guide plate 50, and causes the white light to enter the light guide plate 50 from the back side. In this embodiment 1, the guide unit 40 is a diffuser plate 41 that diffuses the light emitted from the normal light-emitting unit 30. The guide unit 40 is provided between the normal light-emitting unit 30 and the light guide plate 50. The guide unit 40 diffuses the light from the normal light-emitting unit 30 to ensure the desired light distribution. The guide unit 40 is milky white and not transparent. Therefore, even if the light guide plate 50 is transparent, the normal light-emitting unit 30 cannot be seen from the object being illuminated. A portion of the light from the blue light-emitting unit 60 that enters from the side surface 12 of the light guide plate 50 undergoes total internal reflection in the guide unit 40, thereby improving the efficiency of the irradiated light. In other words, the guide unit 40 also functions as a reflector. Furthermore, the induction unit 40 may be made a half-mirror to reflect light from the light guide plate 50 and transmit light from the normal light-emitting unit 30. In addition, the induction unit 40 may be made a dielectric mirror to reflect blue wavelength light and transmit light of other wavelengths. Furthermore, a dimming film whose transmittance can be varied depending on the voltage may be attached to the induction unit 40. In this case, when the normal light-emitting unit 30 is lit, the voltage is increased to increase transmittance, and when only the blue light-emitting unit 60 is lit without the normal light-emitting unit 30, the voltage is decreased to decrease transmittance and reflect light from the light guide plate 50.

[0017] (Light guide plate 50) The light guide plate 50 has a rectangular plate shape when viewed from above. The light guide plate 50 is made of a translucent acrylic resin or glass, and contains fine particles with a diameter smaller than the wavelength of light as a diffuser. The diffuser is, for example, silica. Light incident on the light guide plate 50 manufactured in this way is scattered by Rayleigh scattering. Rayleigh scattering is a phenomenon in which light is scattered by fine particles with a diameter smaller than its own wavelength. The light guide plate 50 has a blue light-emitting section 60 arranged on its side surface 12, and the light emitted from the blue light-emitting section 60 is scattered by Rayleigh scattering. When light is incident on the light guide plate 50 from the plate-shaped side surface 12, the horizontal length is longer than the thickness length, so the light is more likely to hit the scatterer and be scattered by Rayleigh. Conversely, when light is incident on the light guide plate 50 from the plate-shaped side surface 12, the thickness length is shorter than the horizontal length, so the light is less likely to hit the scatterer and is less likely to be scattered by Rayleigh.

[0018] (Blue light-emitting part 60) The blue light-emitting section 60 is positioned parallel to the end face extending in the longitudinal direction of the light guide plate 50. The blue light-emitting section 60 comprises two blue substrates 61 and a plurality of blue light sources 62, each positioned on a blue substrate 61. A plurality of through holes (not shown) are formed in the upper part of the blue substrate 61. The configuration and dimming control of the blue light-emitting section 60 will be described in detail later. The blue light sources 62, which are the plurality of light-emitting elements of the blue light-emitting section 60, are equipped with elements that emit light of different colors; for example, multiple white, blue, and green light-emitting elements are each equipped. That is, the blue light-emitting section 60 is composed of a white LED 63, a blue LED 64, and a green LED 65.

[0019] The blue light-emitting section 60 is attached to the module holder 80 by a fixing member (not shown). The side of the fixing member facing the blue light-emitting section 60 is provided with cylindrical protrusions (not shown). The protrusions are inserted into through holes in the blue substrate 61 of the blue light-emitting section 60. With the protrusions inserted into the through holes, the fixing member is screwed to the module holder 80.

[0020] (White light-emitting part 70) The white light-emitting unit 70 has three white substrates 71 and two types of white light sources 72 with different color temperatures, each provided inside the three white substrates 71. The three white substrates 71 of the white light-emitting unit 70 are arranged in a U-shape in plan view, forming three sides of a rectangle. The angle between adjacent white substrates 71 is 90°. The white light-emitting unit 70 emits white light from the three directions that make up the U-shape.

[0021] The white light source 72 is, for example, a daylight-colored LED with a color temperature of 4000K to 5000K, and the white light source 72 is, for example, an incandescent-colored LED with a color temperature of 2600K to 3000K. The white light-emitting unit 70 can emit white light of various color temperatures and luminous intensities by changing the dimming rate of the white light source 72. The white light source 72 may also be dimmed according to the time of day. For example, the white light source 72 may be dimmed to have a luminous intensity of 100% during the day, 50% at dawn and dusk, and 20% at night. Furthermore, the white light source 72 may be dimmed to have a color temperature of 4500K (daylight white) during the day, a color temperature of 3000K to 3500K (incandescent) in the evening, and a color temperature of 4000K to 3800K at night.

[0022] Furthermore, a light-emitting element or light-emitting device other than an LED may be used as the light source for the white light-emitting section 70. Also, the white light-emitting section 70 may be equipped with only one type of white LED 72a, or it may be equipped with three or more types of white LED 72a. The white light-emitting section 70 is positioned inside the module holder 80 and is held by the module holder 80.

[0023] The white light-emitting section 70 is held by the module holder 80 and positioned on the back of the diffuser cover 90. The blue light-emitting section 60 is also held by the module holder 80 and positioned to face the end face of the light guide plate 50 through a gap. The diffuser cover 90 and the light guide plate 50 are positioned in directions that intersect each other. Specifically, the light guide plate 50 is positioned parallel to the ceiling, and the diffuser cover 90 is positioned to extend diagonally downward from the light guide plate 50.

[0024] (Module holding section 80) Figure 4 is a diagram showing the module holding portion 80 of the lighting fixture 1 according to Embodiment 1, and Figure 5 is an exploded view showing the module holding portion 80 of the lighting fixture 1 according to Embodiment 1. As shown in Figures 2 and 3, the module holding portion 80 has a first module holding portion 210A and a second module holding portion 210B. The first module holding portion 210A holds the white substrate 71, the blue substrate 61 and the light guide plate 50. As shown in Figures 4 and 5, the first module holding portion 210A has a light guide plate mounting portion 211, a first groove portion 212, a first substrate mounting portion 213, a fixing portion 215, a component mounting portion 216, a main body reflective portion 217 and a second substrate mounting portion 218. The second module holding portion 210B does not have the blue substrate 61 attached and does not have the second substrate mounting portion 218 of the first module holding portion 210A. The white substrate 71 and the blue substrate 61 may sometimes be simply referred to as light-emitting substrates.

[0025] In the cross-sectional structure, the light guide plate mounting portion 211 is a horizontally extending plate-shaped portion located in the inner part of the light source unit 20. The light guide plate mounting portion 211 has a pressing recess 211a formed on the upper side of the inner end of the light source unit 20.

[0026] A stepped portion 211b is formed adjacent to the outer surface of the upper side of the light guide plate mounting portion 211. The stepped portion 211b is recessed to accommodate the lower reflecting portion 260. The light guide plate mounting portion 211 is formed so that the upper side surface 211c and the upper surface of the lower reflecting portion 260 housed in the stepped portion 211b are flat. That is, the depth dimension of the stepped portion 211b is formed to be approximately the same as the thickness dimension of the lower reflecting portion 260.

[0027] The first groove 212 is formed on the outside of the light guide plate mounting portion 211 and is a recessed portion that extends downward from the stepped portion 211b. The blue substrate 61 is assembled using the second substrate mounting portion 218 of the module holding portion 80 and the clip 250. One edge of the blue substrate 61 along its longitudinal direction is inserted into the first groove 212. That is, the first groove 212 holds the horizontal and vertical position of the inserted white substrate 71. The first groove 212 is also recessed downward from the light guide plate mounting portion 211. The groove 212 is wider at the top than at the bottom. The first groove 212 into which the white substrate 71 is inserted is sometimes simply referred to as the groove.

[0028] The second substrate mounting portion 218 constitutes the outer wall of the first groove portion 212 and protrudes upward. The blue substrate 61 abuts against the contact surface 218a of the second substrate mounting portion 218, which is the surface facing the first groove portion 212. A second claw portion 218b is formed at the upper end of the second substrate mounting portion 218, and the upper end of the blue substrate 61 catches on it. A body opening is formed on the contact surface 218a of the second substrate mounting portion 218 on the first groove portion 212 side, into which the inner projection 251 of the clip 250 fits. The blue substrate 61 has an opening formed to correspond to the body opening.

[0029] The second substrate mounting portion 218 of the module holding portion 80 has a contact surface 218a that is positioned so as to contact the back surface of the blue substrate 61, and a component mounting portion 216 that protrudes from the back side of the contact surface 218a and is connected to the fixing portion 215. The component mounting portion 216 is formed between the fixing portion 215 and the second substrate mounting portion 218. Below the component mounting portion 216, the first reflective portion of the main body reflective portion 217 is formed, forming the lower surface of the module holding portion 80. The main body reflective portion 217 is a portion that is continuous with the downward-facing surface formed by the bottom of the first groove portion 212, and the first reflective portion and the second reflective portion, which are part of it, are positioned to protrude below the light guide plate mounting portion 211. The space between the component mounting portion 216 and the main body reflective portion 217 is hollow. An L-shaped bracket is inserted into this hollow section, and the L-shaped bracket is fixed to the first module holding section 210A and the second module holding section 210B from above by fixing members such as screws.

[0030] The first substrate mounting portion 213 is the portion to which the white substrate 71 is attached. The first substrate mounting portion 213 protrudes downward from between the fixing portion 215, the component mounting portion 216, and the main body reflective portion 217. A second groove portion 213a is formed at the upper end of the first substrate mounting portion 213, and a claw portion 213b is formed at the lower end. The white substrate 71 is positioned facing inward into the light source unit 20. After the upper edge of the white substrate 71 is inserted into the second groove portion 213a, the lower end of the white substrate 71 is rotated so that it catches on the claw portion 213b and comes into contact with the first substrate mounting portion 213. The lower ends of the white substrate 71 and the first substrate mounting portion 213 are fixed together by a clip 250. The first substrate mounting portion 213 has a main body opening into which an inner projection 251 provided on the inside of the clip 250 fits. The white substrate 71 has an opening formed at a position corresponding to the opening in the main body. The second groove 213a into which a light-emitting substrate such as the white substrate 71 is inserted is sometimes simply referred to as a groove.

[0031] The fixing portion 215 is provided on the upper part of the module holding portion 80 and is located closer to the frame portion 100 than the first substrate mounting portion 213. The fixing portion 215 is formed in an L shape and is placed on the upper surface of the frame portion 100 and fixed to the frame portion 100 with fasteners such as screws.

[0032] The white substrate 71 is fixed to the first substrate mounting portion 213. The diffuser cover 90 is supported at one end by the lower end of the frame side portion 102, and at the other end by contacting the light guide plate 50 via the module holding portion 80. The structure including the frame side portion 102 and the module holding portion 80 that support the white substrate 71 and the diffuser cover 90 may be collectively referred to as a structural member.

[0033] As described above, the module holder 80 is formed from sheet metal with an L-shaped cross-section. The module holder 80 not only holds the blue substrate 61 of the blue light-emitting unit 60, but also functions as a heat sink that releases heat from the blue light-emitting unit 60 to the outside. The module holder 80 is attached to the upper surface of the diffusion cover 90. The blue light-emitting unit 60 is attached to the module holder 80 via an insulating part. Note that if the blue substrate 61 of the blue light-emitting unit 60 is not a double-sided substrate, the insulating part may be omitted.

[0034] (Diffusion cover 90) The diffusion cover 90 is made of, for example, white resin and is formed in a rectangular frame shape when viewed from above. The diffusion cover 90 has a truncated square pyramidal shape with openings on the top and bottom. That is, each of the four sides 12 of the diffusion cover 90 is inclined at a predetermined angle with respect to the vertical. Each of the four sides 12 of the diffusion cover 90 is made of a trapezoidal diffusion plate 41, with the length of the top side being shorter than the length of the bottom side. Also, because each of the four sides 12 of the diffusion cover 90 is inclined, when viewed from above, the position of the top side is positioned inward from the position of the bottom side. As a result, the internal space of the diffusion cover 90 tapers downward. The diffusion cover 90 may be formed by combining four trapezoidal diffusion plates 41 or by integral molding.

[0035] Of the four sides 12 of the diffuser cover 90, three are light-emitting surfaces 91, and the other one is a non-light-emitting surface 92. The three light-emitting surfaces 91 are arranged in a U-shape. Here, on each of the four sides 12 of the diffuser cover 90, the inner surface facing the internal space of the diffuser cover 90 is called the front surface, and the outer surface is called the back surface.

[0036] The diffusion cover 90 is positioned inside the white light-emitting section 70. That is, the white light-emitting section 70 is positioned on the back side of each of the light-emitting surfaces 91 of the diffusion cover 90. The white light emitted from the white light-emitting section 70 enters the diffusion cover 90 from the back of the light-emitting surface 91, passes through the light-emitting surface 91, and is emitted from the front of the light-emitting surface 91. Because each of the light-emitting surfaces 91 is inclined, the white light emitted from the front of the three light-emitting surfaces 91 illuminates in a diagonally downward direction.

[0037] A light-shielding sheet (not shown) is attached to the back of the non-emitting surface 92 of the diffusion cover 90, so that light does not leak from the non-emitting surface 92.

[0038] Thus, the diffuser cover 90 has a configuration that combines three light-emitting surfaces 91 that emit white light and one non-light-emitting surface 92 that does not emit light. As a result, the light emitted from the diffuser cover 90 comes from three directions, creating a visual effect that gives a sense of depth, as if light is shining through a window frame that is in the sun or in the shade.

[0039] The diffusion cover 90 is placed on the frame 100 via a packing (not shown). The packing is formed in a rectangular, narrow frame shape when viewed from above. The packing prevents the frame 100 or the diffusion cover 90 from directly colliding with each other when they vibrate. Furthermore, the elasticity of the packing mitigates the force exerted from the frame 100 on the diffusion cover 90, thereby suppressing damage to the diffusion cover 90. In addition, by providing a packing between the frame 100 and the diffusion cover 90, the appearance of a window frame can be enhanced. This impression is particularly strong when the packing is a light-colored material. The packing also functions as a light-shielding part, preventing white light from leaking through the gap between the diffusion cover 90 and the frame 100.

[0040] White light emitted from the white light-emitting section 70 is incident on the back of the diffuser cover 90 and is emitted from the front of the light-emitting surface 91 of the diffuser cover 90. Because the light-emitting surface 91 is inclined, the white light emitted from the front of the light-emitting surface 91 illuminates diagonally downwards. In addition, light emitted from the blue light-emitting section 60 is incident on the end face of the light guide plate 50 and travels through the light guide plate 50 while undergoing total internal reflection between the upper and lower surfaces of the light guide plate 50. A portion of the light traveling through the light guide plate 50 strikes the scatterer inside the light guide plate 50 and is diffused, resulting in surface emission from the lower surface of the light guide plate 50.

[0041] (Frame section 100) The frame portion 100 is formed in a rectangular frame shape in plan view and has a flange portion 101, a frame side portion 102, and V-springs 103. As shown in Figure 2, the flange portion 101 is positioned to protrude horizontally outward from the lower end of the fixture body 10. The frame side portion 102 extends upward from the flange portion 101, and the module holding portion 80 is attached to it. The V-springs 103 are wire springs formed by bending a metal wire into a V-shape and are attached to the upper surface of the frame portion 100. A total of four V-springs 103 are provided, aligned with the position of the V-spring mounting bracket 14 on the fixture body 10. The light source unit 20 is suspended and held by the fixture body 10 when the V-springs 103 engage with the V-spring mounting bracket 14. When the lighting fixture 1 is installed in a recessed hole in the ceiling, the frame portion 100 covers the edge of the recessed hole. Therefore, when the lighting fixture 1 is installed in the recessed hole in the ceiling, the recessed hole is no longer visible to the user.

[0042] Figure 6 is a side view showing the lighting fixture 1 according to Embodiment 1, and Figure 7 is an enlarged view of a part of the side view showing the lighting fixture 1 according to Embodiment 1. As described above, as shown in Figures 6 and 7, the normal light-emitting section 30 is provided above the light guide plate 50, and the blue light-emitting section 60 and the white light-emitting section 70 are provided to the side of the light guide plate 50.

[0043] (Driving pattern) Figure 8 is a schematic diagram showing a lighting fixture 1 according to Embodiment 1. Next, the operating patterns of the lighting fixture 1 of Embodiment 1 will be described. There are three types of operating patterns in Embodiment 1: a first pattern that does not use the normal light-emitting unit 30, and a second and third pattern that use the normal light-emitting unit 30.

[0044] (Pattern 1) The first pattern provides lighting that mimics a blue sky without using the normal light-emitting unit 30. Blue light is emitted from the light guide plate 50, and the light incident on the light guide plate 50 is Rayleigh scattered, providing lighting that mimics a blue sky on the underside of the light guide plate 50. Furthermore, white light is emitted from the diffuser cover 90, and the white light diffused by the diffuser cover 90 creates the effect of sunlight, allowing the user to perceive depth. The normal light is not used.

[0045] (Pattern 2) The second pattern uses a white light-emitting unit 70 and a normal light-emitting unit 30. Blue light is not used, and white light is emitted to the diffuser cover 90. Normal light is emitted to the back of the light guide plate 50. When the normal light is white, the white light from the white light-emitting unit, together with the light diffused by the diffuser cover 90, can provide the necessary illuminance for the illuminated space. Therefore, the output of the normal light can be reduced.

[0046] (Pattern 3) The third pattern uses only the normal light-emitting unit 30. Blue light and white light are not used. Normal light is emitted from the back of the light guide plate 50. In this way, by providing white light using only the normal light, it is easier for the user to distinguish between the light used for special effects and the light from the base light. As described above, this embodiment 1 can achieve both a lighting space that simulates a blue sky and a lighting space illuminated by a base light by switching between the lighting state of the blue light-emitting unit 60 and the lighting state of the normal light-emitting unit 30.

[0047] According to this embodiment 1, a guide unit 40 is provided that guides the white light emitted from the normal light-emitting unit 30 to the back of the light guide plate 50, and causes the white light to enter from the back side of the light guide plate 50. Therefore, even if the light guide plate 50 is transparent, the normal light-emitting unit 30 is difficult to see from the irradiating side. Thus, it is possible to realize a lighting fixture 1 with a good design while obtaining the desired light emission color.

[0048] Embodiment 2. Figure 9 is a side view showing the lighting fixture 1 according to Embodiment 2, and Figure 10 is an enlarged view of a part of the side view showing the lighting fixture 1 according to Embodiment 2. Embodiment 2 differs from Embodiment 1 in that the installation position of the normal light-emitting unit 30 is different. In Embodiment 2, parts common to Embodiment 1 are given the same reference numerals and their descriptions are omitted, and the explanation will focus on the differences from Embodiment 1.

[0049] As shown in Figures 9 and 10, the normal light-emitting section 30 is located above and to the side of the light guide plate 50, i.e., diagonally upward, while the blue light-emitting section 60 and the white light-emitting section 70 are located to the side of the light guide plate 50. The guide section 40 has a diffuser plate 41 as well as a reflector plate 42 that reflects the light emitted from the normal light-emitting section 30. The reflector plate 42 has an arc shape, gradually approaching the diffuser plate 41 as it moves away from the normal light-emitting section 30, starting from a position that covers the normal light-emitting section 30. The reflector plate 42 may also be a straight plate material that is inclined with respect to the horizontal direction.

[0050] Figure 11 is a schematic diagram showing a lighting fixture 1 according to Embodiment 2. As shown in Figure 11, the light emitted from the normal light-emitting unit 30 is guided along the reflector 42 of the guide unit 40 so as to gradually approach the diffuser 41. Thus, in Embodiment 2, since the normal light-emitting unit 30 is not positioned above the light guide plate 50, the normal light-emitting unit 30 is less visible from the illuminating side, even if the light guide plate 50 is transparent. As shown in Figure 11, the irradiation direction of the normal light-emitting unit 30 may be directed upward. In this case, the light emitted upward from the normal light-emitting unit 30 is reflected by the fixture body 10, etc., and directed towards the reflector. As a result, the installation position of the normal substrate 32 is lowered, which can suppress an increase in the overall thickness of the lighting fixture 1. In Embodiment 2, the blue substrate 61 of the blue light-emitting unit 60 and the normal substrate 32 of the normal light-emitting unit 30 may be made common.

[0051] Embodiment 3. Figure 12 is a side view showing the lighting fixture 1 according to Embodiment 3, and Figure 13 is an enlarged view of a part of the side view showing the lighting fixture 1 according to Embodiment 3. Embodiment 3 differs from Embodiments 1 and 2 in the installation position of the normal light-emitting unit 30. In Embodiment 3, parts common to Embodiments 1 and 2 are denoted by the same reference numerals and their descriptions are omitted, and the explanation will focus on the differences from Embodiments 1 and 2.

[0052] As shown in Figures 12 and 13, the normal light-emitting section 30 is located above and to the side of the light guide plate 50, i.e., diagonally upward, while the blue light-emitting section 60 and the white light-emitting section 70 are located to the side of the light guide plate 50. The guide section 40 has a diffuser plate 41 as well as a lens 43 that focuses or diverges the light emitted from the normal light-emitting section 30. The lens 43 guides the light emitted from the normal light-emitting section 30 towards the diffuser plate 41.

[0053] Figure 14 is a schematic diagram showing a lighting fixture 1 according to Embodiment 3. As shown in Figure 14, the light emitted from the normal light-emitting unit 30 is guided by the lens 43 of the guide unit 40 to approach the diffuser plate 41. Thus, in this Embodiment 3, since the normal light-emitting unit 30 is not positioned above the light guide plate 50, the normal light-emitting unit 30 is less visible from the irradiating side, even if the light guide plate 50 is transparent. In this Embodiment 3 as well, as shown in Figure 14, the blue substrate 61 of the blue light-emitting unit 60 and the normal substrate 32 of the normal light-emitting unit 30 may be made common.

[0054] Embodiment 4. Figure 15 is a schematic diagram showing a lighting fixture 1 according to Embodiment 4. This Embodiment 4 differs from Embodiments 1 to 3 in the installation position of the normal light-emitting unit 30. As in this Embodiment 4, the normal light-emitting unit 30 may be installed on the fixture body 10, etc., where the power supply 21 is provided. This eliminates the need to provide the normal light-emitting unit 30 on the light source unit 20, and the existing light source unit 20 can be used as is. In other words, the versatility of the light source unit 20 can be increased.

[0055] Although preferred embodiments have been described in detail above, various modifications and substitutions can be made to the above embodiments without limiting the scope of the claims and without departing from the scope of the claims.

[0056] The various aspects of this disclosure are summarized below as an appendix. (Note 1) A blue light-emitting unit that is supplied with power and emits blue light, A normal light-emitting unit that receives power and emits white light, The blue light-emitting section is positioned on the side, and a light guide plate is provided to cause Rayleigh scattering of the light emitted from the blue light-emitting section. A guide unit that guides the white light emitted from the normal light-emitting unit to the back of the light guide plate and causes the white light to enter from the back side of the light guide plate, A lighting fixture equipped with [a specific feature / feature]. (Note 2) The system further includes a power supply that switches between the illuminated state of the blue light-emitting section and the illuminated state of the normal light-emitting section. Lighting fixtures as described in Appendix 1. (Note 3) The normal light-emitting section is located on the back side of the induction section. Lighting fixtures as described in Appendix 1 or 2. (Note 4) A white light-emitting unit that is supplied with power and emits light, The light guide plate is further provided with a diffusion cover that diffuses the light emitted from the white light-emitting section. A lighting fixture as described in any one of the notes 1 to 3. (Note 5) The aforementioned induction unit is It has a diffuser plate that diffuses the light emitted from the normal light-emitting unit. A lighting fixture as described in any one of the notes 1 to 4. (Note 6) The aforementioned induction unit is It has a reflector that reflects light emitted from the normal light-emitting unit. A lighting fixture listed in any one of the following appendices 1-5. (Note 7) The aforementioned induction unit is It has a lens that focuses or diverges the light emitted from the conventional light-emitting unit. A lighting fixture listed in any one of the appendices 1 to 6. [Explanation of Symbols]

[0057] 1 Lighting fixture, 10 Fixture body, 11 Main surface, 12 Side surface, 13 Wire hole, 14 V-spring mounting bracket, 20 Light source unit, 21 Power supply, 22 Power supply device, 23 Dimming unit, 30 Standard light-emitting part, 31 Plate, 32 Standard circuit board, 33 Standard light source, 40 Guide part, 41 Diffuser plate, 42 Reflector plate, 43 Lens, 50 Light guide plate, 60 Blue light-emitting part, 61 Blue circuit board, 62 Blue light source, 63 White LED, 64 Blue LED, 65 Green LED, 70 White light-emitting part, 71 White circuit board, 72 White light source, 72a White LED, 80 Module holder, 90 Diffuser cover, 91 Light-emitting surface, 92 Non-light-emitting surface, 100 Frame part, 101 Flange part, 102 Frame side part, 103 V-spring, 210A 1st module holding part, 210B 2nd module holding part, 211 light guide plate mounting part, 211a pressing side recess, 211b stepped part, 212 1st groove part, 213 1st substrate mounting part, 213a 2nd groove part, 215 fixing part, 216 component mounting part, 217 main body reflective part, 218 2nd substrate mounting part, 218a contact surface, 218b 2nd claw part, 250 clip, 251 inner protrusion, 260 lower reflective part.

Claims

1. A blue light-emitting unit that is supplied with power and emits blue light, A normal light-emitting unit that receives power and emits white light, The blue light-emitting section is positioned on the side, and a light guide plate is provided to cause Rayleigh scattering of the light emitted from the blue light-emitting section. A guide unit that guides the white light emitted from the normal light-emitting unit to the back of the light guide plate and causes the white light to enter from the back side of the light guide plate, A lighting fixture equipped with [a specific feature / feature].

2. The system further includes a power supply that switches between the illuminated state of the blue light-emitting section and the illuminated state of the normal light-emitting section. A lighting fixture according to claim 1.

3. The normal light-emitting section is located on the back side of the induction section. A lighting fixture according to claim 1 or 2.

4. A white light-emitting unit that is supplied with power and emits light, The light guide plate is further provided with a diffusion cover that diffuses the light emitted from the white light-emitting section. A lighting fixture according to claim 1 or 2.

5. The aforementioned induction unit is It has a diffuser plate that diffuses the light emitted from the normal light-emitting unit. A lighting fixture according to claim 1 or 2.

6. The aforementioned induction unit is It has a reflector that reflects light emitted from the normal light-emitting unit. A lighting fixture according to claim 1 or 2.

7. The aforementioned induction unit is It has a lens that focuses or diverges the light emitted from the conventional light-emitting unit. A lighting fixture according to claim 1 or 2.

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