JP7599210B2 - Lighting fixtures - Google Patents

Description

The present invention relates to a lighting device equipped with a light guide plate.

Taking advantage of the power saving and long life of LEDs, several lighting fixtures using LEDs have been proposed. For example, Patent Document 1 discloses a lighting fixture equipped with a light distribution control member, a light guide, etc.

JP 2020-123561 A

The lighting fixture of Patent Document 1 is designed to have a thinner fixture body, and includes a light source module having one or more solid-state light-emitting elements and a substrate on which the solid-state light-emitting elements are mounted on the mounting surface. The lighting fixture includes a light guide that guides light emitted from the light-emitting surface of the solid-state light-emitting element and irradiates the lighting space, and a main body that supports the light source module and the light guide. However, in the lighting device aspect of Patent Document 1, the vertical LED light-emitting element that illuminates the lighting space (living room) and the vertical LED for the light guide are mounted on the same substrate, which makes the lighting device configuration complicated and causes the light guide plate to function insufficiently.

Therefore, the present invention aims to provide a lighting device that has an excellent light guide plate function and a streamlined configuration.

In order to achieve the above object, the lighting fixture of the present invention comprises:
A body having an opening at its center;
an adapter that is installed in the opening and is mechanically and electrically connected to the wiring device;
a housing removably connected to a fitting disposed on an edge of the body;
a light source disposed within the housing and having a plurality of light emitting elements mounted on a substrate;
a flat light guide plate having an opening having substantially the same shape as the light source;
A light diffusing cover that covers the light exit surface side of the light source;
a frame disposed between the light guide plate and the light diffusion cover and disposed in the opening of the light guide plate;
A lighting fixture comprising:
The light emitting devices are surface mounted in a row on the substrate,
the frame includes an LED module that emits light toward a side surface of the light guide plate,
The light diffusing cover is disposed on the front side of the frame.

The light guide plate of the present invention extends in a substantially horizontal direction and has a design portion that extracts the light emitted from the LED module and passing through the light guide plate to the outside of the light guide plate.

According to the present invention, by using a light guide plate with a design part in a lighting fixture having light emitting elements such as LEDs, it is possible to obtain a lighting fixture that has excellent light diffusion and visual effects, as well as a thin and simple configuration.

FIG. 1 is an exploded perspective view of a lighting fixture according to an embodiment. FIG. 2A is a schematic side view of the lighting fixture according to the embodiment, and FIG. 2B is a schematic cross-sectional view of the lighting fixture. FIG. 3 is a cross-sectional view of a main part near a light guide plate of the lighting device according to the embodiment. FIG. 4A is an external perspective view of the lighting fixture of the embodiment as viewed from the floor surface side. FIG. 4B is a plan view of the lighting fixture as viewed from the floor side. FIG. 4C is a plan view showing the light guide plate, the housing, and the main body as viewed from the ceiling surface side of the same lighting fixture. FIG. 5 is a plan view showing an arrangement of fixtures on the main body of the lighting fixture according to the embodiment. FIG. 6A is a plan view showing a modification of the housing of the lighting device of the embodiment, and FIG. 6B is a side view of the same.

An embodiment of the present invention will be described. Note that the present invention is not limited to the following embodiment. In addition, the same parts are given the same reference numerals in each of the following drawings. The lighting fixture and light diffusion cover of the present invention can be applied to various lighting fixtures, such as ceiling lights that are attached to wiring fixtures such as ceiling rosettes placed on the ceiling surface, and pendants that are suspended from the ceiling surface.

In a typical home, a wiring device 3 called a ceiling rosette, ceiling body, ceiling, or rosette is attached to the ceiling surface for mounting a ceiling light or the like. A lighting device 1 is attached to the wiring device 3 installed on the ceiling surface 2 inside the home via an adapter 100.

In addition, in a typical home, AC power is supplied from a commercial power source. By attaching an adapter 100 for the lighting fixture 1 to a wiring fixture 3 installed on the ceiling surface 2, the wiring fixture 3 and the adapter 100 are mechanically and electrically connected, and AC power is supplied from the adapter 100 to the lighting fixture 1 through the wiring fixture 3 from the power line in the home.

Here, a lighting fixture according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below shows one specific example of the present invention, and therefore the arrangement, functions, and numerical values of the components described in the embodiment are merely examples, and should not be construed as limiting the scope of the present invention.

(Embodiment)
The lighting fixture 1 according to the embodiment will be described below.

Figure 1 is an exploded perspective view of a lighting fixture 1 according to an embodiment of the present invention. As shown in the figure, the lighting fixture 1 according to the embodiment is composed of a main body 10, a power supply unit 20, a housing 60, a light guide plate 80, a frame 70, a light diffusion cover 30, and a light source 50. The main body 10 is a member also called a "chassis" and is formed into a circular shape from a flat plate of a metal material such as cold-rolled steel, with a circular opening 13 formed in the center.

An adapter 100 is attached to the opening 13 of the main body 10 for attaching the lighting fixture 1 to the wiring fixture 3 arranged on the ceiling surface 2. To detachably fix the adapter 100, a circular mounting member 35 for fixing the adapter 100 is provided in the opening 13 of the main body 10. In addition, the main body 10 is provided with three mounting fixtures 90 for engaging with the housing 60, each spaced apart concentrically, near the wall portion 15 of the flat plate portion 11. Note that the number of mounting fixtures 90 is not limited to three, and can be changed as appropriate depending on the configuration of the main body 10 and the housing 60, such as providing four mounting fixtures.

The housing 60 has an approximately quadrangular pyramid shape, with the top 62 being circular in cross section and the bottom 63 being approximately square in cross section. On the inside of the edge of the top 62, three inner protrusions 61 are provided at regular intervals corresponding to the attachment 90 for fitting into the attachment 90 of the main body 10 to detachably connect the housing 60 and the main body 10. The power supply unit 20 is disposed between the top 62 of the housing 60 and the light source 50. The power supply unit 20 and the approximately rectangular parallelepiped light source 50 are installed in order from the top 62 side of the housing 60. On the bottom 63 side of the housing 60, the light guide plate 80, the frame 70, and the light diffusion cover 30 are disposed in that order. The housing 60 is fixed to the main body 10 by the engagement between the attachment 90 provided near the wall 15 of the main body 10 and the inner protrusions 61 provided on the edge of the housing 60. As a result, the light source 50, the light guide plate 80, the frame 70, and the light diffusion cover 30, which are integrally fixed to the housing 60, are positioned on the ceiling surface 2.

In this embodiment, a housing 60 having an approximately truncated pyramid shape is used, but the shape of the housing 60 is not limited to the approximately truncated pyramid shape of the embodiment, and may be an inverted truncated pyramid shape in which the top and bottom of the truncated pyramid are swapped, or may be any other suitable shape, such as a cylindrical shape, a truncated cone shape, a cubic shape, or a rectangular parallelepiped shape. Note that components such as wiring, screws, and connectors are omitted from the drawings (the same applies below).

The light source 50 has a plurality of light-emitting elements 52, such as LEDs, mounted on a substantially rectangular substrate 51. The substrate 51 is not limited to a single flat plate, and may be a plurality of substrates connected together to form a substantially rectangular shape overall. The substrate 51 is also not limited to a substantially rectangular shape, and may be a circular substrate on which a plurality of light-emitting elements are mounted in a row or ring shape. The light source 50 serves as the main illumination unit, emitting light from its surface and illuminating the front (floor) side.

The light-emitting elements 52 are surface-mounted LED packages, and a plurality of them are mounted on the substrate 51 at a predetermined interval. In the embodiment, the light-emitting elements 52 are arranged in a matrix at a certain interval. Alternatively, the light-emitting elements 52 may be arranged with daylight white and incandescent white light emitting elements alternately arranged with a predetermined interval between adjacent light-emitting elements 52 in each row. The color can be adjusted by adjusting the current flowing through the daylight white and incandescent white light emitting elements 52. Alternatively, the light-emitting elements 52 may be light-emitting elements 52 having a light emission color other than daylight white and incandescent white. The number and arrangement of the light-emitting elements 52 can be appropriately set according to the desired output, for example, in a row or in a ring shape. Alternatively, organic EL elements may be used instead of LEDs.

The light-emitting element 52 can be made to function as a night light by dimming the entire light-emitting element 52 mounted on the substrate 51, but by using one or more of the light-emitting elements 52 as a night light and adjusting the brightness, an environment in which a person can sleep peacefully at night can be created in an ordinary home. In this case, it is preferable that the light-emitting element 52 be an incandescent light color.

The substrate 51 is a flat plate having a substantially rectangular shape. On the surface of the substrate 51, a plurality of light-emitting elements 52 are mounted, and a power terminal (not shown) that receives DC power from the power supply unit 20 is arranged.

The substrate 51 is made of a flat plate of insulating glass epoxy resin (FR-4), and has a wiring pattern formed of silver foil on the surface side on which the light emitting element 52 is mounted. The wiring pattern is not limited to this, and may be formed on the back side or inside of the substrate 51. A white resist layer that acts as a reflective layer is applied to the top of the wiring pattern, i.e., the surface of the substrate 51. When the substrate 51 is made of insulating material, ceramic materials, synthetic resin materials, etc. can be used as the material for the substrate 51 in addition to glass epoxy resin (FR-4). When the substrate 51 is made of metal, a base substrate in which an insulating layer is laminated on one side of a base plate with good thermal conductivity and excellent heat dissipation properties, such as aluminum, can be used.

The light diffusion cover 30 is arranged to completely cover the light irradiation surface of the light source 50, and diffuses the linear emitted light of the light emitting element 52 to illuminate the front (floor) side. The light diffusion cover 30 is made of a milky white material, but the surface of the light diffusion cover 30 may be provided with a lens portion (not shown) that faces the light emitting element 52 mounted on the substrate 51 to impart anti-glare properties and light diffusion effects. The surface of the light diffusion cover 30 may also be processed into a frosted glass or slit pattern to impart anti-glare properties and light diffusion properties.

The light diffusion cover 30 is made of a transparent resin with light diffusion properties, such as polycarbonate (PC), acrylic such as PMMA (polymethyl methacrylate), or PS (polystyrene).

A cover member (not shown), also known as a "globe," may be provided to cover the surface of the light diffusion cover 30. The cover member may have any shape that covers the surface of the light diffusion cover 30, but is made of a translucent material and may be a milky white material to provide light diffusion and anti-glare properties. The cover member may be made of an acrylic resin such as PMMA (polymethyl methacrylate), but is not limited to this, and may be made of synthetic resin such as polycarbonate or polystyrene. The surface of the cover member may be processed into a frosted glass or slit pattern to provide light diffusion and anti-glare properties.

Figure 2 (A) is a schematic side view showing the lighting fixture 1 of the embodiment attached to the ceiling surface 2. Here, the ceiling surface 2 and the wiring fixture 3 are omitted. The housing 60 has a generally quadrangular truncated pyramid shape, with the top 62 having a circular cross section and the bottom 63 having a generally square cross section. The area near the bottom 63 is composed of four rectangular vertical faces that rise perpendicularly from each side of the square cross section, and the area near the bottom 63 has an overall rectangular parallelepiped shape. The main body 10 is removably arranged on the top 62 of the housing 60.

2A, an adapter 80 is attached to the top surface of the main body 10, and a pair of inverted L-shaped hook blades 101 provided on the top surface of the adapter 80 protrude from the top surface of the main body 80. The hook blades 101 engage with a pair of hook blade engagement holes 104 of the wiring device 3 arranged on the ceiling surface 2 to detachably fix the lighting device 1 to the wiring device 3. The light guide plate 80, frame 70, and light diffusion cover 30 are arranged in this order on the bottom 63 side of the housing 60. A plurality of LED modules 73 that emit irradiation light toward the side surface of the flat light guide plate 80 are arranged in a row along the side surface of the frame 70. Note that components such as wiring, screws, and connectors are omitted in the drawings (the same applies below).

Figure 2 (B) is a schematic cross-sectional view of Figure 2 (A). The adapter 100 has a pair of claws 102 on the side. The claws 102 engage with an annular mounting member 35 arranged around the opening 13 of the main body 10 and are held by the mounting member 35, and the main body 10 is attached to the wiring device 3 by being held by the adapter 100.

Inside the housing 60, a box-shaped power supply unit 20, a light source 50, a light guide plate 80, a substantially rectangular frame 70 consisting of a frame material 71 with an L-shaped cross section that supports the light guide plate 80, and a light diffusion cover 30 are arranged in that order. The light guide plate 80 has an opening 81 that is substantially the same shape as the light source 50. The light diffusion cover 30 is also arranged on the light exit surface side of the light guide section 80.

Figure 3 is a cross-sectional view of the main part near the light guide plate 80 of the lighting fixture 1 of the embodiment. The light diffusion cover 30 receives light emitted from a plurality of light emitting elements 52 mounted on a substrate 51 of a light source 50 installed in a housing 60 toward the front (floor surface), and diffuses the light in the room, emitting light with uniform brightness, etc. The arrows in Figure 3 indicate the direction of light emission.

The frame 70 has a generally square shape overall, with a frame material 71 having an L-shaped cross section surrounding all four sides and an opening 74. On the bottom (bottom part of the L-shape) 72 of the frame material 71, a number of LED modules 73 are arranged in a row along the frame material 71 assembled in a generally square shape. Irradiation light is emitted from the LED modules 73 in a generally horizontal outward direction. The row-shaped LED modules 73 are arranged in a single row, but may be arranged in multiple rows, and LED modules 73 with different light colors may be arranged as appropriate.

The light guide plate 80 has an internal rectangular opening 81 placed on a bottom 72 that protrudes outward in a substantially horizontal direction in the L-shaped frame material 71 of the frame 70. Inside the housing 60, the light source 50, light guide plate 80, frame 70, and light diffusion cover 30 are arranged in this order from the ceiling surface 2 side.

The light guide plate 80 is disposed approximately parallel to the ceiling surface 2. The LED module 73 emits irradiation light from the side of the conductive plate 80 toward the side of the light guide plate 80. The irradiation light incident on the light guide plate 80 passes through the inside of the light guide plate 80 and reaches the design part 82, and the light passing through the light guide plate 80 from the design part 82 is extracted to the outside of the light guide plate 80, so that the irradiation light is emitted toward the outside of the design part 82. As a result, the design part 82 shines brightly, and the pattern of the design part 82 drawn on the light guide plate 80 is expressed. A part of the irradiation light passing through the light guide plate 80 passes through the conductive plate 80 as it is, and is emitted from the end of the light guide plate 80 toward the outside. The design portion 82 is, for example, a recess formed on the surface of the light guide plate 80, and is a portion that changes the course of the irradiated light passing through the inside of the light guide plate 80 by using the recess, and directs it to be emitted to the outside of the light guide plate 80. Specifically, the design portion 82 is decorated with letters, figures, symbols, pictures, patterns that combine these, etc., to change the course of the irradiated light.

The light guide plate 80 provided with the design part 82 has a design effect by emitting light from the design part 82, and has an effect of giving the consumer a sense of satisfaction and fulfillment such as relaxation and comfort through the visual effect. In the light source 50, by receiving a control signal from the power supply device 20 and controlling the light emitting element 52, it is possible to turn on/off the light emitted from the light diffusion cover 30, as well as to dim (change the brightness) and adjust the color (change the color tone). Similarly, in the LED module 73 that emits light toward the side surface of the light guide plate 80, it is possible to turn on/off, dim, and adjust the color of the light irradiated from the design part 82 of the light guide plate 80 by controlling the power supply device 20.
In the embodiment, the light guide plate 80 extends in a substantially horizontal direction (a direction substantially parallel to the floor surface), but may be given a certain angle (horizontal angle α) with respect to the horizontal direction. In the embodiment, the horizontal angle α of the light guide plate 80 is substantially 0°, but the horizontal angle α of the light guide plate 80 may be set within a range of 0° to ±60° so as to be inclined at an angle of 15°, 30°, or 45° toward the floor surface side (α=−15°, −30°, −45°) or at an angle of 15°, 30°, or 45° toward the ceiling surface side (α=15°, 30°, 45°) with respect to the horizontal plane (plane parallel to the floor surface).

Furthermore, in order to enhance the presentation of the lighting device 1, flickering lighting may be adopted as the lighting method of the light guide plate. Flickering lighting is a method of changing the brightness of the light guide plate 80 provided with the design part 82 between 0 and 90% regularly or irregularly and continuously over time, thereby dimming and controlling the brightness of the design part 82 of the light guide plate 80. By using such flickering lighting, a mode can be formed that enhances the presentation effect of the room as a relaxing space. Furthermore, the presentation effect of the relaxing space can be enhanced by dimming the flickering lighting mode in a so-called 1/f fluctuation mode (a fluctuation in which the spectral density is inversely proportional to the frequency f, where f>0). The standard dimming range of the brightness of the light guide plate 80 is between 0 and 90%, but the dimming range can be set appropriately by the consumer, such as 0% to 80%, 5% to 75%, etc.
The cycle of flickering lighting is set to once every 8 seconds as a standard, but it may be set within the range of 1 to 60 seconds, such as once every 5 seconds or once every 15 seconds. This setting can be changed by the consumer, so that the setting can be adjusted to meet the consumer's needs.

Also, for example, by adding to the power supply device 20 a color adjustment control function that changes the light color of the LED module 73 continuously in a regular or irregular manner, it is possible to perform flickering lighting that changes the light color of the design portion 82 of the light guide plate 80 continuously in a regular or irregular manner. Furthermore, by adding to the power supply device 20 a flickering lighting control function that controls the light and color of the light source 50 in addition to the flickering lighting control related to the dimming or color adjustment of the LED module 73 described above, it is possible to control the flickering lighting of the light source 50 in addition to the dimming or color adjustment control of the LED module 73. In either case, it is desirable to base the flickering lighting on 1/f fluctuation.
In this way, by controlling the flickering lighting of the LED module 73 or the light source 50, it is expected that the consumer will experience improved relaxation and comfort.

Furthermore, for example, by equipping the lighting fixture 1 of the embodiment with an audio device including a speaker, and combining auditory effects such as the sound of waves, the murmuring of a river, the swaying of twigs, the chirping of birds, and sound effects of specific frequencies, etc., with control of the flickering lighting of the LED module 73 or the light source 50, the effects of relaxation, comfort, etc. can be further improved.

In addition, around the power supply unit 20, which is located between the main body 10 and the light source 50 inside the housing 60, an audio device including a speaker, a sterilizing and deodorizing device using a photocatalyst, an earthquake warning device equipped with a sensor that detects earthquakes, a wireless LAN repeater for connecting mobile phones and personal computers to the Internet, etc. may be arranged.

By controlling the two types of light generating sources, the light source 50 and the LED module 73, it is possible to (1) turn on only the design portion 82 of the light guide plate 80 by turning on the LED module 73 with the light source 50 turned off, (2) turn on only the light source 50, or (3) turn on both the light source 50 and the design portion 82 simultaneously. Furthermore, by adjusting the brightness and color of each of the two types of light generating sources, the light source 50 and the LED module 73, various light combinations are possible, and lighting can be set to the preferences of each consumer.
Furthermore, by sequentially turning on/off the multiple LED modules 73 arranged in a row along the frame material 71 assembled in a substantially square shape, the light emitted from the LED modules 73 can be made to flow, which is expected to improve the presentation effect, etc. Also, the LED modules 73 arranged along each side of the frame material 71 may be individually turned on/off, dimmed, and color adjusted for each substantially rectangular side to increase the variety of lighting patterns.

Figure 4A is an external perspective view of the lighting fixture 1 of the embodiment as seen from the floor side. When the LED modules 73 are turned on in the lighting fixture 1 installed on the ceiling surface 2, the design portion 82 consisting of figures such as lines, circles, squares, and diamonds drawn on the light guide plate 80 emits bright light. The lighting fixture 1 is turned on for use as lighting in relaxing situations, for example. The light guide plate 80 can also be used as a night light by turning on only the LED modules 73 of the light guide plate 80 without turning on the light diffusion cover 30, i.e., turning on the light source 50, and reducing the number of LED modules turned on to adjust the brightness or to adjust the color to a light bulb color.

Figure 4B is a plan view showing the lighting fixture 1 of the embodiment as viewed from the floor surface side. Figure 4B shows a similar rectangular light guide plate 80 arranged to surround the rectangular light diffusion cover 30. Figure 4C is a plan view showing the structural relationship of the light guide plate 80, housing 60, main body 10 having opening 13, and adapter 100 fitted into opening 13 as viewed from the ceiling surface 2 side of the lighting fixture 1 of the embodiment.

Figure 5 is a plan view showing the arrangement of the mounting fixture 90 on the main body 10 of the lighting fixture 1 of the embodiment. The main body 10 has a central opening 13 and an annular convex portion 14 formed around the central opening 13 and protruding toward the ceiling surface 2, a flat plate portion 11, and a wall portion 15 rising almost vertically from the flat plate portion 11 to the front (floor surface) side on the outside of the flat plate portion 11. When attaching the housing 60 to the main body 10, the wall portion 15 can be used as an auxiliary member for positioning the main body 10 when lifting the housing 60 along the wall portion 15.

The inner protrusion 61 on the edge of the housing 60 fits into the mounting fixture 90 arranged on the flat plate portion 11 of the main body 10, and acts to secure the housing 60 to the main body 10.

The annular mounting member 35 is arranged so as to surround the periphery of the opening 13 in the protrusion 14 of the main body 10. The mounting member 35 is a member with a U-shaped cross section that has a groove on the inner circumference side, and the pair of claws 102 of the adapter 100 fit into this groove, thereby holding the main body 10 by the adapter 100.

The material of the mounting fixture 90 may be, for example, metal or resin. Examples of such metal materials include color steel plate, galvanized steel plate, and stainless steel plate for springs, while examples of resin materials include PP (polypropylene), PBT (polybutylene terephthalate), etc.

A conventionally known adapter 100 can be used. A representative example of such an adapter 100 is one having a flat cylindrical shape as shown in Figs. 1 and 2(B), with a hook blade 101 on the upper surface for engaging with a hook blade engagement hole 104 of a wiring device 3 arranged on a ceiling surface 2. The adapter 100 has wiring (not shown) that connects to a power supply unit 20 in the lighting fixture 1. The wiring device 3 and the adapter 100 are mechanically and electrically connected by engaging the hook blade engagement hole 104 with the hook blade 101.

The lighting fixture 1 is attached to the ceiling surface 2 in the following way. First, the hook blade 101 of the adapter 100 is engaged with the hook blade engagement hole 104 of the wiring fixture 3, and the adapter 100 is fixed to the wiring fixture 3. Next, the main body 10 is lifted up, the adapter 100 is passed through the central opening 13 of the main body 10, and the pair of claws 102 of the adapter 100 are pushed up until they clear the opening 13 of the main body 10.

The pair of claws 102 of the adapter 100 are spring-biased in both outward directions, so when the main body 10 is lifted over the claws 102, the claws 102 engage with the mounting member 35 arranged in the opening 13 of the main body 10, and the main body 10 is fixed to the adapter 100. Then, by lifting the housing 60 so that it is aligned with the main body 10 and rotating it horizontally, the mounting fixture 90 of the main body 10 engages with the inner protrusion 61 provided on the edge of the housing 60, and the housing 60 is fixed to the ceiling surface 2 together with the main body 10.

To remove the lighting fixture 1 from the ceiling surface 2 and the adapter 100, the housing 60 is rotated and removed, and then the pair of levers 83 on the underside of the adapter 100 are pulled inward, causing the claws 102 to be pulled inward of the adapter 100, disengaging the claws 102 from the mounting member 35, and the main body 10 can be removed.

The power supply device 20 is connected to an external power source through the adapter 100 and the wiring device 3, and includes a rectifier circuit that rectifies the current supplied from the external power source such as AC 100V, a transformer that converts the rectified voltage to a predetermined voltage, a constant current supply circuit that supplies a constant current to the light source 50, and a control circuit that receives a transmission signal transmitted from a remote controller 110 outside the lighting fixture 1, generates a receiving sound, and performs power control, etc. The receiving sound is a beep sound, but a melody sound or a voice based on voice data may also be used. The power supply device 20 is also electrically connected to the light source 50 and the LED module 73, and controls the on/off, dimming, color adjustment, etc. of the light source 50 and the LED module 73. When an accessory device such as an audio device such as a speaker or a photocatalytic sterilization and deodorization device is connected, it is possible to handle it by adding a control circuit that controls those devices to the power supply circuit 20.

The remote controller 110 also includes a display panel 111 and operation buttons 112 for instructing the lighting fixture 1 to be turned on/off, dimmed, adjusted in color, or flickered. The display panel 111 is located on the upper surface of the remote controller 110 and displays the lighting fixture 1's on/off, dimmed, adjusted in color, or flickered in color. When the operator presses the operation button 112, the remote controller 110 transmits an infrared signal as an instruction signal to the receiving device of the lighting fixture 1, receives the infrared signal transmitted from the remote controller 110 at a signal receiving unit installed in the housing 60, and transmits the received signal to the power supply unit 20. The power supply unit 20 controls the light source 50 and the LED module 73 to be turned on/off, etc., according to the instruction signal from the remote controller 110. When an accessory device such as an audio device such as a speaker or a photocatalyst sterilization and deodorization device is connected to the lighting fixture 1, the accessory device can be controlled by operating the remote controller 110. The operation buttons 112 of the remote controller 110 that operates the lighting device 1 may be configured as multiple buttons, with each button transmitting an independent instruction signal.

6A is a plan view showing a modified example of the housing 60 of the lighting fixture 1 of the embodiment, and FIG. 6B is a side view showing a modified example of the housing 60 of the lighting fixture 1 of the embodiment. In this modified example, the top 62 and bottom 63 of the housing 60 are both square in plan view, and the top 62 is a pyramid shape smaller than the bottom 63. Vertically long slits 64 are provided in several places on the side of the housing 60. These slits 64 are not limited to the modified example, but are also used in the housing of the embodiment, and dissipate heat generated from heat sources such as the light source 50, the LED module 73, and the power supply unit 20. Heat from these heat sources can be efficiently dissipated not only from the slits 64 but also from the housing 60, the main body 10, the light guide plate 80, and the light diffusion cover 30, preventing heating inside the housing 60. Heat can also be efficiently dissipated from the opening of the top 62 of the housing 60. Furthermore, the slits 64 have the effect of improving the volume of the received sound that occurs when receiving an operation signal transmitted from the remote controller 110.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

The present invention can improve the light diffusion and anti-glare properties of lighting fixtures while simplifying the configuration, making it applicable to a variety of lighting fixtures, including ceiling lights that can be attached to wiring fixtures such as ceiling rosettes and pendants that can be hung from the ceiling, as well as emergency lights, disaster prevention lights, street lights, and more.

REFERENCE SIGNS LIST 1 Lighting fixture 2 Ceiling surface 3 Wiring fixture 10 Main body 11 Flat plate portion 13 Opening 14 Convex portion 15 Wall portion 20 Power supply unit 30 Light diffusion cover 35 Mounting member 50 Light source 51 Board 52 Light-emitting element 60 Housing 61 Inner convex portion 62 Top portion 63 Bottom portion 64 Slit 70 Frame 71 Frame material 72 Bottom portion 73 LED module 74 Opening portion 80 Light guide plate 81 Opening 82 Design portion 83 Lever 90 Mounting fixture 100 Adapter 101 Hook blade 102 Claw portion 104 Hook blade engagement hole 110 Remote controller 111 Display panel 112 Operation button

Claims (7)

A body having an opening at its center;
an adapter that is installed in the opening and is mechanically and electrically connected to the wiring device;
a housing removably connected to a fitting disposed on an edge of the body;
a substantially rectangular light source disposed within the housing and having a plurality of light emitting elements mounted on a substrate;
a flat light guide plate having an opening having substantially the same shape as the light source;
A light diffusing cover that covers the light exit surface side of the light source;
a frame disposed between the light guide plate and the light diffusion cover and disposed in the opening of the light guide plate;
A lighting fixture comprising:
The light emitting devices are surface mounted in a row on the substrate,
the frame includes LED modules arranged in a row along a side surface of the frame and emitting light toward a side surface of the light guide plate,
The light diffusion cover is disposed on a front side of the frame,
the light guide plate extends in a substantially horizontal direction and has a design portion that extracts the light emitted from the LED module and passing through the light guide plate to the outside of the light guide plate;
A lighting fixture characterized by: The lighting fixture according to claim 1, further comprising a power supply device disposed between the housing and the main body, receiving power from the adapter, supplying power to the light source and the LED module, and controlling the on/off, dimming, and color adjustment of the light source and the LED module. 3. The lighting fixture according to claim 2 , further comprising a signal receiving unit that receives an instruction signal transmitted from a remote controller external to the lighting fixture and transmits the instruction signal to the power supply device. 2. The lighting fixture according to claim 1 , wherein the housing is held by engagement between a mounting fixture disposed on the main body and an inner protrusion provided on the housing. The lighting device according to claim 2 or 3, characterized in that the power supply device continuously changes the brightness of the LED module between 0 and 90 % regularly or irregularly over time to dim the brightness of the design portion of the light guide plate. 4. The lighting fixture according to claim 2, wherein the power supply device continuously changes the light color of the LED module regularly or irregularly to adjust the light color of the design portion of the light guide plate. 3. The lighting fixture according to claim 2 , wherein the dimming or color adjustment control of the LED module by the power supply device is based on 1/f fluctuation.

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