Lighting fixtures

Abstract

To provide a lighting device which is excellent in a function of a light guide plate and has a streamlined structure.SOLUTION: A lighting device 1 of the invention has a body 10, a light diffusion cover 30, a light source 50, a light guide plate 80, and attachment tools 90. Light emitting elements 52 forming the light source 50 are mounted in an array form on a surface of a substrate 51, and a frame 70 includes LED modules 73 each of which emits light to a side surface of the light guide plate 80. The light guide plate 80 extends in a substantially horizontal direction and has design parts 82 each of which extracts light emitted from the LED modules 73 and passing through the light guide plate 80 to the outside of the light guide plate 80. The light diffusion cover 30 has a milky-white color and is disposed at the light emitting surface side of the light guide plate 80.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lighting fixture equipped with a light guide plate. [Background technology]

[0002] 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 including a light distribution control member, a light guide, and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-123561 A Summary of the Invention [Problem to be solved by the invention]

[0004] The lighting fixture of Patent Document 1 is aimed at making the main body of the fixture thinner, 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, and the lighting fixture includes a light guide that guides the 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 configuration of the lighting device complicated and causes the light guide plate to function insufficiently.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a lighting device having an excellent light guide plate function and a streamlined structure. [Means for solving the problem]

[0006] In order to achieve the above object, the lighting fixture of the present invention comprises: A body having a central opening; 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.

[0007] Furthermore, the light guide plate of the present invention has a design portion that extends in a substantially horizontal direction and extracts light that is emitted from the LED module and passes through the light guide plate to the outside of the light guide plate. Effect of the Invention

[0008] According to the present invention, by using a light guide plate having a design portion in a lighting fixture having a light emitting element such as an LED, it is possible to obtain a lighting fixture that has excellent light diffusion properties and visual effects, as well as being thin and simply configured. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an exploded perspective view of a lighting fixture according to an embodiment. [Diagram 2] 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. [Diagram 3] FIG. 3 is a cross-sectional view of a main part near a light guide plate of the lighting device according to the embodiment. [Figure 4A] FIG. 4A is an external perspective view of the lighting fixture of the embodiment as viewed from the floor surface side. [Figure 4B] FIG. 4B is a plan view of the lighting fixture as viewed from the floor side. [Figure 4C] 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. [Diagram 5] FIG. 5 is a plan view showing an arrangement of fixtures on the main body of the lighting fixture according to the embodiment. [Figure 6] FIG. 6(A) is a plan view showing a modification of the housing of the lighting device of the embodiment, and FIG. 6(B) is a side view of the same. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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 symbols 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 a ceiling light that is attached to a wiring fixture such as a ceiling rosette placed on a ceiling surface, and a pendant that is suspended from a ceiling surface.

[0011] In a typical home, a wiring device 3 called a hook-on ceiling rosette, hook-on ceiling body, hook-on ceiling, hook-on rosette, etc. for mounting a ceiling light, etc. is attached to the ceiling surface. A lighting device 1 is attached to the wiring device 3 installed on the ceiling surface 2 in the home via an adapter 100.

[0012] Moreover, in a typical home, AC power is supplied from a commercial power source. By attaching an adapter 100 for a lighting fixture 1 to a wiring fixture 3 installed on a 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 a power line in the home.

[0013] 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, numerical values, etc. of the components described in the embodiment are merely examples, and the scope of the present invention should not be limited by these.

[0014] (Embodiment) A lighting device 1 according to an embodiment will now be described.

[0015] Fig. 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 a cold-rolled steel plate, with a circular opening 13 formed in the center.

[0016] An adapter 100 for attaching the lighting fixture 1 to a wiring fixture 3 arranged on a ceiling surface 2 is attached to the opening 13 of the main body 10. In order to removably fix the adapter 100, an annular mounting member 35 for fixing the adapter 100 is provided in the opening 13 of the main body 10. Also, the main body 10 is provided with three mounting fixtures 90 for engaging with the housing 60, each of which is concentrically arranged at regular intervals near the wall portion 15 of the flat plate portion 11. 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, for example, to four.

[0017] The housing 60 has a generally quadrangular pyramid shape, with a top 62 having a circular cross section and a bottom 63 having a generally square 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 couple 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 light source 50 having a generally rectangular parallelepiped shape are disposed in this 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 this 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 disposed on the ceiling surface 2 .

[0018] In this embodiment, a housing 60 having a substantially truncated quadrangular pyramid shape is used, but the shape of the housing 60 is not limited to the substantially truncated quadrangular pyramid shape of the embodiment, and may be an inverted truncated quadrangular pyramid shape in which the apex and bottom of the truncated quadrangular pyramid are interchanged, or may be any other suitable shape such as a cylindrical shape, a truncated cone shape, a cubic shape, a rectangular parallelepiped shape, etc. Note that components such as wiring, screws, connectors, etc. are omitted in the drawings (the same applies below).

[0019] 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 a main illumination unit, emitting light from its surface and illuminating the front (floor) side.

[0020] The light emitting element 52 is a surface-mounted LED package, and a plurality of light emitting elements 52 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. The light emitting elements 52 may be arranged alternately with daylight white and light bulb white light emitting elements 52 arranged at 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 light bulb white light emitting elements 52. The light emitting elements 52 may be light emitting elements 52 having a light emitting color other than daylight white and light bulb white. The number and arrangement of the light emitting elements 52 may be appropriately set according to the desired output, for example, in a row or in a ring shape. Organic EL elements may be used instead of LEDs.

[0021] The light-emitting element 52 can function as a nightlight 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 nightlight 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 desirable for the light-emitting element 52 to be an incandescent light color.

[0022] 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 and a power supply terminal (not shown) for receiving a supply of DC power from the power supply device 20 are arranged.

[0023] The substrate 51 is made of a flat plate of glass epoxy resin (FR-4) which is an insulating material, 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 acting as a reflective layer is applied to the upper part of the wiring pattern, i.e., on the surface of the substrate 51. When the substrate 51 is made of an insulating material, ceramic materials, synthetic resin materials, etc. can be used as the material of 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 surface of a base plate such as aluminum having good thermal conductivity and excellent heat dissipation properties can be used.

[0024] The light diffusion cover 30 is disposed so as to completely cover the light irradiation surface of the light source 50, and diffuses the linearly emitted light of the light emitting element 52 to irradiate the front (floor) side. The light diffusion cover 30 uses a milky white material, but the surface of the light diffusion cover 30 may be provided with a lens portion (not shown) facing 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 be processed into a frosted glass or slit pattern to impart anti-glare properties and light diffusion properties.

[0025] The light diffusion cover 30 is formed from a transparent resin having light diffusion properties, and for example, polycarbonate (PC), acrylic such as PMMA (polymethyl methacrylate), PS (polystyrene), or the like is used.

[0026] A cover member (not shown), also called a "globe", may be provided to cover the surface of the light diffusion cover 30. The cover member may have any shape as long as it covers the surface of the light diffusion cover 30, but is made of a light-transmitting 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 thereto, and may be made of a 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.

[0027] 2(A) is a schematic side view showing a state in which a lighting fixture 1 of an embodiment is attached to a 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 a top 62 having a circular cross section and a 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 detachably disposed on the top 62 of the housing 60.

[0028] 2(A), an adapter 80 is attached to the upper surface of the main body 10, and a pair of inverted L-shaped hook blades 101 provided on the upper surface of the adapter 80 protrude from the upper 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, the frame 70, and the light diffusion cover 30 are arranged in this order on the bottom 63 side of the housing 60. The 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).

[0029] 2(B) is a schematic cross-sectional view of FIG. 2(A). The adapter 100 has a pair of claws 102 on its side. The claws 102 engage with an annular mounting member 35 disposed around the opening 13 of the main body 10, and are held by the mounting member 35. The main body 10 is attached to the wiring device 3 by being held by the adapter 100.

[0030] Arranged in the housing 60 are a box-shaped power supply device 20, a light source 50, a light guide plate 80, a substantially rectangular frame 70 made of a frame material 71 with an L-shaped cross section that supports the light guide plate 80, and a light diffusion cover 30, 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 arranged on the light exit surface side of the light guide section 80.

[0031] Fig. 3 is a cross-sectional view of a 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 the light source 50 installed in the housing 60 toward the front surface (floor surface), and diffuses the light in the room to emit surface light with uniform brightness, etc. The arrows in Fig. 3 indicate the light emission direction.

[0032] 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 having an opening 74. On a bottom (bottom part of the L shape) 72 of the frame material 71, a plurality 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.

[0033] The light guide plate 80 has an internal rectangular opening 81 placed on a bottom portion 72 that protrudes substantially horizontally outwardly of an L-shaped frame material 71 of the frame 70. Inside the housing 60, the light source 50, the light guide plate 80, the frame 70, and the light diffusion cover 30 are arranged in this order from the ceiling surface 2 side.

[0034] 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 path of the irradiated light passing through the inside of the light guide plate 80 by using the formed recess and guides 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 combining these, etc. for changing the path of the irradiated light.

[0035] The light guide plate 80 provided with the design part 82 exhibits a design effect by emitting light from the design part 82, and the visual effect has the effect of giving the consumer a sense of satisfaction and fulfillment, such as relaxation and comfort. 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 adjust the dimming (changing the brightness) and the color (changing 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, adjust the dimming, and adjust the color of the light emitted 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 provided with 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 (α=−15°, −30°, −45°) or inclined at an angle of 15°, 30°, or 45° toward the ceiling surface (α=15°, 30°, 45°) with respect to the horizontal plane (plane parallel to the floor surface).

[0036] 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 performing such flickering lighting, a mode can be formed that enhances the presentation effect of the room as a relaxing space. Furthermore, 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 presentation effect of the room as a relaxing space can be enhanced. 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 it can be set to meet the consumer's needs.

[0037] 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 dimming and color adjustment 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 effect of relaxation and comfort for the consumer can be improved.

[0038] 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, 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.

[0039] In addition, around the power supply unit 20 arranged between the main body 10 and the light source 50 in the housing 60, in addition to an audio device including a speaker, a sterilizing and deodorizing machine 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.

[0040] 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 the LED module 73 with the light source 50 turned off to turn on only the design portion 82 of the light guide plate 80, (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, allowing each consumer to set their preferred lighting. 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.

[0041] 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 used, for example, as lighting in a relaxing situation when the light diffusion cover 30 is not emitting light, that is, when the light source 50 is not turned on and only the LED modules 73 of the light guide plate 80 are turned on, the number of LED modules turned on can be reduced to adjust the brightness or adjust the color to a light bulb color, and the light guide plate 80 can also be used as a night light.

[0042] Fig. 4B is a plan view showing the lighting fixture 1 of the embodiment as viewed from the floor surface side. Fig. 4B shows a state in which a rectangular light guide plate 80 of a similar shape is arranged to surround the rectangular light diffusion cover 30. Fig. 4C is a plan view showing the configuration relationship of the light guide plate 80, the housing 60, the main body 10 having the opening 13, and the adapter 100 fitted into the opening 13 as viewed from the ceiling surface 2 side of the lighting fixture 1 of the embodiment.

[0043] 5 is a plan view showing the arrangement of mounting fixture 90 on main body 10 of lighting fixture 1 of the embodiment. Main body 10 has central opening 13, annular convex portion 14 formed around the central opening and protruding toward ceiling surface 2, flat plate portion 11, and wall portion 15 rising almost vertically from flat plate portion 11 to the front surface (floor surface) outside flat plate portion 11. When mounting housing 60 to main body 10 and lifting housing 60 along wall portion 15, wall portion 15 can be used as an auxiliary member for positioning main body 10.

[0044] An inner protrusion 61 on the edge of the housing 60 fits into a mounting fixture 90 arranged on the flat plate portion 11 of the main body 10 , and acts to fix the housing 60 to the main body 10 .

[0045] The annular mounting member 35 is disposed 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 having a U-shaped cross section with a groove on the inner periphery side, and the main body 10 is held by the adapter 100 by fitting a pair of claws 102 of the adapter 100 into this groove.

[0046] 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), and the like.

[0047] 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 Fig. 1 and Fig. 2(B) and having a hook blade 101 on the upper surface side 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 device 20 in a 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.

[0048] The lighting fixture 1 is attached to the ceiling surface 2 as follows. 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 is pushed up until it clears the opening 13 of the main body 10.

[0049] A pair of claws 102 of the adapter 100 are biased in both outward directions by a spring, so that 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 as to align it with the main body 10 and rotating it horizontally, the mounting fixture 90 of the main body 10 and the inner protrusion 61 provided on the edge of the housing 60 engage with each other, and the housing 60 is fixed to the ceiling surface 2 together with the main body 10.

[0050] In addition, to remove the lighting fixture 1 from the ceiling surface 2 and the adapter 100, the housing 60 is rotated and removed, and then a pair of levers 83 on the underside of the adapter 100 are pulled inward, whereby the claw portions 102 are pulled inward of the adapter 100, disengaging the claw portions 102 from the mounting member 35, and the main body 10 can be removed.

[0051] 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 into 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 reception sound, and performs power control, etc. The reception 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 photocatalyst 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.

[0052] 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, and flickered. The display panel 111 is disposed on the upper surface of the remote controller 110, and displays the lighting fixture 1's on / off, dimmed, adjusted in color, and flickered lighting status. When the operator presses the operation button 112, the remote controller 110 transmits an infrared signal as an instruction signal to a 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 device 20. The power supply device 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 sterilizing and deodorizing 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 for operating the lighting device 1 may be a plurality of buttons, each of which may be configured to transmit an independent instruction signal.

[0053] FIG. 6(A) is a plan view showing a modified example of the housing 60 of the lighting device 1 of the embodiment, and FIG. 6(B) is a side view showing a modified example of the housing 60 of the lighting device 1 of the embodiment. In the housing 60 of this modified example, the planar shapes of the top 62 and the bottom 63 are both square, and the top 62 is a quadrangular pyramid smaller in size than the bottom 63. Vertically long slits 64 are provided in several places on the side of the housing 60. The 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 device 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, and heating inside the housing 60 can be prevented. In addition, heat can 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 generated when an operation signal transmitted from the remote controller 110 is received.

[0054] Although the present invention has been described above with reference to the embodiment, the present invention is not limited to the above embodiment. 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.

[0055] According to the present invention, it is possible to improve the light diffusion and anti-glare properties of a lighting fixture while simplifying its configuration, and therefore the present invention can be applied to various lighting fixtures such as ceiling lights that can be attached to wiring fixtures such as a hook-in ceiling rosette placed on the ceiling surface, pendants that can be hung from the ceiling surface, as well as emergency lights, disaster prevention lights, street lights, etc. [Explanation of symbols]

[0056] 1 Lighting equipment 2 Ceiling surface 3 Wiring equipment 10 Main unit 11 Flat plate part 13 Aperture 14 Convex 15 Wall 20 Power supply 30 Light diffusion cover 35 Mounting material 50 light source 51 Substrate 52 Light emitting element 60 Housing 61 Inner convex part 62 Top 63 Bottom 64 Slit 70 frames 71 Frame material 72 Bottom 73 LED Module 74 Opening part 80 Light guide plate 81 Opening 82 Design Department 83 Lever 90 Mounting fixture 100 Adapter 101 Hook blade 102 Claw part 104 Hook blade engagement hole 110 Remote Controller 111 Display Panel 112 Operation Button

Claims

1. A body having a central opening; 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:

2. The lighting fixture according to claim 1, further comprising a power supply unit 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. 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.

4. 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.

5. 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.

6. 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.

7. 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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