JP2022129938A - light emitting device - Google Patents

Abstract

To provide a light emitting device which easily emits clear light, is light-weight, and has excellent handleability.SOLUTION: A light emitting device 1 includes: a housing 75; a light source disposed within the housing 75; and a glass cloth sheet 65 having a cloth woven by using glass fibers and a translucent resin part which covers at least a first surface of the cloth. The glass cloth sheet 65 includes an emission surface 65a from which light from the light source is emitted. The resin part may cover only the first surface of the cloth or may have a portion which covers a second surface of the cloth in addition to a portion which covers the first surface.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to light emitting devices that emit light.

The Building Standards Act stipulates that when installing a light-emitting device larger than a predetermined size on the wall or ceiling of a basement or windowless room, the cover, including the light emitting surface, must be made of noncombustible materials. It is stipulated as Against this background, conventionally, when a cover or the like including an emission surface for emitting light is made of a noncombustible material, tempered glass is used as the noncombustible material, as described in Patent Document 1.

JP 2020-167094 A

Tempered glass is excellent in translucency, so it is easy to emit clear light. However, in the case of a large-sized light-emitting device, if the light-transmitting member closest to the light-emitting side including the light-emitting surface is made of tempered glass, the weight will be 10 kg or more, and transportation and installation will be difficult. In addition, tempered glass may break due to contact with other members or parts, and requires careful handling.

Accordingly, an object of the present disclosure is to provide a light-emitting device that easily emits clear light, is lightweight, and is easy to handle.

In order to solve the above problems, the light-emitting device according to the present disclosure includes a housing, a light source arranged in the housing, a fabric woven with glass fibers, and a translucent material covering at least a first surface of the fabric. and a light-transmitting sheet including an emission surface through which light from the light source is emitted.

Advantageous Effects of Invention According to the present disclosure, it is possible to realize a light-emitting device that easily emits clear light, is lightweight, and is easy to handle.

1 is a perspective view showing a state in which a light emitting device according to an embodiment of the present disclosure is installed; FIG. It is a perspective view when the light emitting device is seen from below. It is a perspective view when a light-emitting device is seen from the upper side. FIG. 2 is an exploded perspective view of the main part of the light emitting device; (a) is a plan view of a light source module fixed to a main body as viewed from below, and (b) is a schematic diagram illustrating the structure of a composite light source. 4 is a cross-sectional view of the optical component mounting portion taken along a plane passing through the center in the X direction and including the Y direction and the Z direction; FIG. It is a perspective view of the light-emitting device of a modification. FIG. 8 is a cross-sectional view taken along the line AA of FIG. 7;

Embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that the characteristic portions thereof will be appropriately combined to construct a new embodiment. Further, in the following embodiments, the same reference numerals are given to the same configurations in the drawings, and redundant explanations are omitted. In addition, a plurality of drawings include schematic diagrams, and the dimensional ratios of length, width, height, etc. of each member do not necessarily match between different drawings. In addition, among the constituent elements described below, constituent elements that are not described in independent claims indicating the highest concept are optional constituent elements and are not essential constituent elements. Also, in this specification, when the word "abbreviated" is used, it is used with the same meaning as the word "roughly speaking", and the requirement of "abbreviated ~" means that if a person roughly looks like ~ It is filled. For example, the nearly circular requirement is met if a person appears roughly circular.

Further, the light-emitting device of the present disclosure may be installed on the side wall of a building as described in the modified example, but in the embodiment, the light-emitting device 1 has a substantially rectangular parallelepiped shape and is installed on the building. A case of installation on the ceiling will be described. In the description and drawings of the embodiments, the Z direction is the height direction of the light emitting device 1 . The X direction is the direction in which the pair of first outer frames 70a in the frame 70 having rectangular outer edges when viewed from the height direction extends, and the Y direction is the direction in which another pair of the first outer frames 70a in the frame 70 extends. 2 is the extending direction of the outer frame 70b. The X, Y and Z directions are orthogonal to each other. Further, in the embodiments, the light emission side in the height direction is referred to as the lower side in the height direction, and the side opposite to the light emission side in the height direction is referred to as the upper side in the height direction. Further, in the following description, a translucent sheet having a woven fabric woven with glass fibers and a translucent resin portion covering at least the first surface of the woven fabric is referred to as a glass cloth sheet.

FIG. 1 is a perspective view showing a state in which a light-emitting device 1 according to an embodiment of the present disclosure is installed. It is a perspective view which shows the installed light-emitting device 1. FIG. The light-emitting device 1 is installed, for example, on the ceiling of a space where it is desired to produce a feeling of openness or relaxation, such as a basement or an underground mall of a commercial facility, where natural lighting cannot be obtained. More specifically, the light-emitting device 1 can be used, for example, in passages 2, basements, and commercial facilities of the convention center 5, as well as entrances of banks and public offices, hospital waiting rooms, creative offices, aquariums, museums, and corporate entrances. Installed.

As will be described in detail later, the light emitting device 1 can create and present any image (scene) with light from the light source module 35 (see FIG. 5). For example, the light-emitting device 1 displays the image of white clouds floating in the blue sky shown in FIG. The light from the light source module 35 can be used to produce the young leaves of white birch or the like shining in the light of spring. In the example shown in FIG. 1, the light-emitting device 1 imitates a skylight, and people feel as if they are looking at a natural sky such as blue sky, white clouds, cloudy sky, sunset sky, hazy moon, etc. through an indoor window. Light that mimics the sky is produced in a pseudo manner, and images that mimic the movement of the natural sky are produced with light. The light emitting device 1 is installed on construction materials such as a ceiling and a wall, and is embedded in the ceiling 3 when a skylight is simulated as in the present embodiment.

FIG. 2 is a perspective view of the light emitting device 1 viewed from below. As shown in FIG. 2, the light emitting device 1 has a substantially rectangular parallelepiped shape, and has a frame body 70 that is substantially rectangular (substantially square or substantially rectangular) in plan view. The frame 70 has a flange 71 forming the lower end of the housing 75 in the Z direction. The collar portion 71 contacts the installation surface of the ceiling 3 (see FIG. 1). The housing 75 is fixed to the ceiling 3 by fastening a fixing member such as a screw (not shown) to the ceiling 3 after passing through the outer edge side end of the flange 71 . When a person views the light emitting device 1 from below in the Z direction, the inner edge side portion 84 (see FIG. 1) of the lower surface of the flange portion 71 can be visually recognized over the entire circumference. In this way, the gap between the opening provided in the ceiling 3 and the light emitting device 1 is made invisible to a person, thereby making the light emitting device 1 excellent in appearance and stylish.

The frame 70 defines an opening 72 through which the light emitted by the light source module 35 passes. The light emitted from the light source module 35 reaches the irradiation area after passing through the glass cloth sheet 65 including the emission surface 65a. The frame 70 has a substantially rectangular shape in plan view when viewed from below in the Z direction. The structure of the glass cloth sheet 65 will be described later in detail. The shape of the frame in plan view when viewed from below in the Z direction is not limited to a substantially rectangular shape, and may be substantially circular, substantially polygonal, or substantially semicircular.

FIG. 3 is a perspective view of the light emitting device 1 viewed from above. As shown in FIG. 3, the housing 75 has through holes 77 arranged in two rows in the X direction on a top surface 76 on the upper side in the Z direction. through-hole 83 of . The through-hole 77 has a rectangular opening in plan view when viewed from above in the Z direction. The area of the two through-holes 77 in plan view when viewed from the upper side in the Z direction occupies most of the area of the light emitting device 1 in plan view when viewed from the upper side in the Z direction. The light-emitting device 1 includes one or more electric parts 15 , and the electric parts 15 can be visually recognized from the outside through the through holes 77 . A plurality of through-holes 77 and 83 are provided to efficiently dissipate heat generated by one or more electrical parts 15 and light source modules 35 to the outside.

FIG. 4 is an exploded perspective view of the main parts of the light emitting device 1. FIG. As shown in FIG. 4 , the light emitting device 1 includes a cover portion 10 , a body portion 30 , an optical component mounting portion 50 and a frame 70 . These four parts are fixed together and integrated together, for example, in the following manner. Specifically, the cover part 10 has a structure in which the side walls 78 are provided only on both sides in the X direction and no side walls are provided on both sides in the Y direction. The cover portion may have side walls on both sides in the Y direction in addition to the sides in the X direction. The cover portion may be covered with side walls along the entire circumference. The cover portion 10 has locking portions 11 projecting downward in the Z direction from the top surface 76 at both ends in the Y direction. The engaging portion 11 has a claw portion 11a bent inward in the Y direction at its lower end portion.

The main body portion 30 is engaged with the cover portion 10 by engaging the claw portions 11 a of the locking portion 11 with the lower surface 31 of the substantially rectangular parallelepiped main body portion 30 from both sides in the Y direction. The optical component mounting portion 50 has a substantially rectangular parallelepiped concave portion 55 that is substantially rectangular in plan view when viewed in the Z direction. In addition, the optical component mounting portion 50 has four inner surfaces 51 that are substantially rectangular in plan view when viewed in the Z direction. The optical component mounting portion 50 has a plurality of protrusions 53 protruding inward at the same height in the Z direction of each inner surface 51 . The plurality of protrusions 53 are provided at predetermined intervals in the circumferential direction of the inner surface 51 and include protrusions 53 protruding from each inner surface 51 . The body portion 30 locked to the cover portion 10 is accommodated in the recess 55 until the lower surface 31 of the body portion 30 comes into contact with the plurality of projections 53 protruding from the four inner surfaces 51 .

For example, the optical component mounting portion 50 is fixed to the main body portion 30 by tightening screws (not shown) from the outside of each side surface of the optical component mounting portion 50 to the optical component mounting portion 50 and the main body portion 30 in that order. The cover part 10 is located outside in the X direction when the cover part 10, the main body part 30, and the optical component mounting part 50 are integrated. The cover section 10 is fixed to the optical component mounting section 50 by tightening screws (not shown) in the order of the side wall 78 of the cover section 10 and the optical component mounting section 50 from the outside in the X direction.

The frame body 70 has an upright portion 73 that is substantially rectangular in plan view when viewed in the Z direction, and a plurality of biasing member mounting portions 74 provided on both sides in the X direction. The upright portion 73 has a substantially rectangular shape in plan view when viewed in the Z direction, and has four plate-like portions 88 . Each plate-like portion 88 extends upward in the Z direction from the inner edge portion of the collar portion 71 . Two or more biasing member mounting portions 74 arranged on each side in the X direction are arranged at intervals in the Y direction. The plate-like biasing member mounting portion 74 is arranged outside the standing portion 73 while being spaced from the standing portion 73 and spreads substantially parallel to the standing portion 73 .

The optical component mounting portion 50 has a lower end portion having a frame-like shape in plan view when viewed from below in the Z direction. A lower end portion of the optical component mounting portion 50 contacts the outside of the standing portion 73 on the upper surface of the flange portion 71 . A portion of the lower end portion of the optical component mounting portion 50 is inserted between the standing portion 73 and the biasing member mounting portion 74 . A plurality of V-shaped elastic members 79 are attached to the urging member attaching portion 74 , the interval of which increases upward in the Z direction.

As shown in FIG. 2, on the side wall of the cover 10, an L-shaped fitting 19 having a through hole in the bottom plate extending substantially parallel to the XY plane orthogonal to the Z direction is attached. The V-shaped elastic member 79 is temporarily compressed so that the opening width is narrowed, and the upper end of the elastic member 79 is passed through the through hole of the metal fitting 19 . The elastic member 79 is locked to the fitting 19 by a restoring force that causes the elastic member 79 to return to the shape before compression. Thereby, the frame body 70 can be integrated with the cover part 10, and the cover part 10, the main body part 30, the optical component mounting part 50, and the frame body 70 are integrally integrated.

The housing 75 is composed of members forming the outer surface of the integrated body of the cover section 10 , the main body section 30 , the optical component mounting section 50 , and the frame body 70 . Each member is made of, for example, a metallic material or a non-metallic material having high thermal conductivity. Non-metallic materials with high thermal conductivity include resins with high thermal conductivity and the like. By using a material with high thermal conductivity for each member, the heat generated by the light source module can be efficiently radiated to the outside through the housing 75 .

Note that the method of integrating the four parts is not limited to the method described above. The integration of the four parts may be done using any fixing means. For example, any two portions may be integrated by providing a groove opening downward or upward in one of the portions and press-fitting another portion into the groove. Alternatively, any two portions may be integrated by locking a projection protruding from a side wall provided in another portion into a hole provided in the side wall of one of the portions. Alternatively, any two parts may be joined together using welding or adhesives. Alternatively, the four parts may be integrated only by screwing. Further, although the housing 75 has a substantially rectangular shape in plan view when viewed from below in the Z direction, the housing may have any shape in plan view. A shape, or a shape such as a substantially semicircular shape may be used.

Next, the configurations of the main body portion 30 and the optical component mounting portion 50 will be described in detail. As shown in FIG. 4 , the body portion 30 includes one or more electrical components 15 and a light source module 35 . The electrical equipment section 15 has a power supply device and a signal conversion section. The power supply converts AC power supplied from a commercial power source into DC power, transforms the DC power, and supplies the DC power to the light source module 35 . Also, the signal converter includes a substrate and a plurality of electronic components mounted on the substrate. The substrate is a printed wiring board. As the substrate, for example, a resin substrate based on resin, a metal base substrate based on metal, a ceramic substrate made of ceramic, or the like can be used.

The one or more signal converters include a controller. The control device is preferably configured by a computer such as a microcomputer, and includes a control section and a storage section. The control unit, that is, the processor includes, for example, a CPU (Central Processing Unit). The storage unit is composed of a hard disk drive (HDD), semiconductor memory, etc. The semiconductor memory is composed of non-volatile memory such as ROM (Read Only Memory) and volatile memory such as RAM (Random Access Memory). be done. The storage unit may be composed of only one storage medium, or may be composed of a plurality of different storage media. The CPU reads and executes a program or the like pre-stored in the storage unit. In addition, the nonvolatile memory stores in advance a control program, a predetermined threshold value, and the like. Also, the volatile memory temporarily stores read programs and processing data. One or more signal converters receive video signals sent from the outside and control the current supplied to each composite light source that constitutes the light source module 35 . The light emitting device 1 displays and produces a desired image with light emitted from the light source module 35 controlled by one or more signal conversion units.

The light source module 35 is composed of an LED (Light Emitting Diode) vision for signage. LED vision (electronic bulletin board) is an electronic signboard called digital signage (video display device). Compared to a liquid crystal screen that illuminates the liquid crystal with a backlight, the LED vision uses the light emitted by the LED element as it is, so it can emit bright light with high luminance. The light source module 35 has a plate-like shape. The light source module 35 is fixed to the lower side of the body frame 33 of the body section 30 by means of fixing means such as an adhesive or screws, and spreads substantially parallel to the XY plane. The light source module 35 emits light downward in the Z direction.

FIG. 5A is a plan view of the light source module 35 fixed to the main body 30 as viewed from below in the Z direction. As shown in FIG. 5( a ), the light source module 35 has a substrate 36 and multiple compound light sources 37 mounted on the substrate 36 . A plurality of compound light sources 37 constitute a light source 39 . A plurality of compound light sources 37 are mounted in a matrix at regular intervals (pitch) on the mounting surface (lower surface) of the substrate 36 . The normal to the mounting surface is substantially parallel to the Z direction. As the pitch, for example, 3.9 mm, 8.33 mm, or 10 mm can be adopted. The board 36 is a printed wiring board. As the substrate 36, for example, a resin substrate based on resin, a metal base substrate based on metal, a ceramic substrate made of ceramic, or the like can be used. The substrate 36 has a planar shape corresponding to the planar shape defined by the housing 75 when viewed in the Z direction, and has a substantially rectangular planar shape in this embodiment.

As shown in FIG. 5(b), each compound light source 37 is composed of an SMD (Surface Mount Device) type element. A green LED element 37b for emitting light and a blue LED element 37c for emitting blue light are arranged. The one or more power supply devices have a plurality of switching elements for performing on/off control of the LED elements 37a, 37b, and 37c of each compound light source 37, and each switching element is composed of a transistor or the like. The one or more signal converters, upon receiving a video signal from the outside, read control information corresponding to video information included in the video signal from the storage unit. The brightness of the light emitted from each of the LED elements 37a, 37b, and 37c is controlled by on/off controlling each of the plurality of switching elements based on the read control information. The light emitting device 1 emits light representing a desired image, such as a blue sky, a white cloud, a cloudy sky, or a sunset sky, under the control of one or more signal conversion units. The light source may include a COB (Chip On Board) type light emitting element in addition to the SMD type LED element. Also, the case where the light source includes three light emitting elements that emit light of three colors of red, green and blue has been described. However, the light source may include four light emitting elements that emit four colors of red, green, blue, and white, or may include two light emitting elements that emit two colors of blue and white. Also, the light source may simply emit illumination light without emitting light representing an image. The light source may include a semiconductor laser element, or may include a solid-state light-emitting element such as an organic EL (Electro Luminescence) element or an inorganic EL element. Alternatively, the light source may include incandescent and fluorescent lights.

Referring to FIG. 4 again, the optical component mounting portion 50 has a reflecting member 56, a diffusion plate 60, and a glass cloth sheet 65 (see FIG. 2). The reflecting member 56 is a bottomless cylindrical case. The reflecting member 56 accommodates the light source modules 35 and has an opening through which the light emitted by each compound light source 37 passes. The reflecting member 56 has side walls 58 surrounding the light source module 35 . The side wall portion 58 includes four plate portions having a shape corresponding to the shape of the substrate 36 and surrounding the light source module 35 . The four plate portions extend downward in the Z direction from the substrate 36 side. The side wall portion 58 has, on its inner surface, a reflecting surface 57 that reflects an image of the light emitted by the plurality of compound light sources 37 .

The reflecting surface 57 of the reflecting member 56 reflects the light emitted from the light source module 35 toward the diffuser plate 60 . The reflecting member 56 is made of a metal material such as aluminum, and the reflecting surface 57 is subjected to mirror finishing or light diffusion treatment. Mirror finishing includes polishing and lapping. Further, the light diffusion treatment is matting treatment such as alumite treatment. Note that the reflecting surface 57 may not be subjected to the mirror surface treatment or the light diffusion treatment, and the reflection surface 57 may be a plain material before being subjected to the mirror surface treatment or the light diffusion treatment. The light reflectance of the reflecting surface 57 is, for example, 95% or more. The light reflectance of the reflecting surface 57 may be less than 95%, for example, 94%.

FIG. 6 is a cross-sectional view of the optical component mounting portion 50 taken along a plane passing through the center in the X direction and including the Y direction and the Z direction. As shown in FIG. 6, the optical component mounting portion 50 includes a spacer 63 , a frame member 67 having screw holes, and a pressing screw 68 in addition to a reflecting member 56 , a diffuser plate 60 and a glass cloth sheet 65 . have. Each of the spacer 63 and the frame-shaped member 67 is composed of a frame-shaped plate member having a rectangular cross section. The frame member 67 is arranged below the spacer 63 . The frame member 67 is fixed, for example, to a portion that is stationary with respect to the reflecting member 56 via a connecting member (not shown) so that it cannot move relative to the reflecting member 56 .

The frame member 67 has two plate portions 67a extending in the X direction and two plate portions 67a extending in the Y direction, each having one or more screw holes. The outer edge of the diffusion plate 60 is sandwiched between the annular lower surface of the reflecting member 56 and the annular upper surface of the spacer 63 , and the outer edge of the glass cloth sheet 65 is sandwiched between the annular lower surface of the spacer 63 and the annular lower surface of the frame member 67 . It is sandwiched with the annular upper surface. The upper surface of the outer edge of the glass cloth sheet 65 is fixed to the lower surface of the spacer 63 with double-sided tape (adhesive tape). A plurality of pressing screws 68 are screwed into the screw holes of the frame member 67 from below the frame member 67 to press the lower surface of the spacer 63 upward. In this manner, the diffusion plate 60 is fixed to the reflection member 56 by sandwiching the diffusion plate 60 between the reflection member 56 and the spacer 63 without a gap. The diffuser plate 60 is substantially parallel to the XY plane while being fixed to the reflecting member 56 . Note that the spacer 63 may be supported by a guide portion (not shown), and may be relatively movable in the Z direction while being positioned on the XY plane.

The diffuser plate 60 is a plate member having translucency and light diffusing properties. The diffusion plate 60 is arranged to face the light source module 35 in the Z direction and covers the opening of the reflection member 56 . The diffuser plate 60 is arranged inside the reflecting member 56 in a posture substantially parallel to the light source module 35 . The diffuser plate 60 transmits and diffuses the light incident from the light incident surface (upper surface) on the upper side in the Z direction, and emits the light from the light exit surface (lower surface). The diffuser plate 60 has a shape corresponding to the opening of the reflecting member 56, and has a substantially rectangular shape in a plan view when viewed in the Z direction. The shape of the light diffusing plate in plan view may be any shape, not limited to rectangular, but may be circular, polygonal, semicircular, or the like.

The diffusion plate 60 is produced by subjecting a transparent plate made of transparent resin material such as acrylic, silicone, or PET (polyethylene terephthalate), or glass to diffusion processing, for example. The diffuser plate 60 has a high transmittance by being made of a transparent material. Diffusion processing is performed on at least one of the light incident surface and the light exit surface of the diffuser plate 60 . As the diffusion processing, for example, prism processing for forming prisms composed of minute dot-like concave portions or convex portions, texture processing, printing, or the like may be employed. The haze value of the diffusion plate 60 subjected to diffusion processing is, for example, about several tens of percent. By increasing the haze value, it is possible to effectively prevent the composite light source 37 from appearing grainy. If the haze value is too high, it becomes difficult to see the outline of the image, so the haze value is set to, for example, a predetermined percentage or less, for example, 90% or less.

The glass cloth sheet 65 is a translucent sheet having a fabric (glass cloth) woven with translucent glass fibers and a translucent resin portion covering at least the first surface of the fabric. The resin portion may be made of any translucent resin. The glass cloth sheet 65 is flame retardant or nonflammable. In addition, the resin portion may include a portion that covers the second surface of the fabric.

The glass cloth sheet 65 may be a nonflammable sheet made by laminating glass cloth with vinyl chloride resin. The glass cloth sheet 65 preferably has a visible light transmittance of 80% or more, and more preferably has high transparency with a total light transmittance of 90% or more. As the glass cloth sheet 65, it is conventionally used for partitions in special buildings subject to interior restrictions, partitions in factories that require noncombustible materials, or fireproof hanging walls. A glass cloth sheet can be used.

Referring to FIG. 6, glass cloth sheet 65 preferably extends so as to be substantially parallel to the XY plane. The glass cloth sheet 65 is preferably spaced apart from the diffusion plate 60 in the Z direction. It is preferable to have Moreover, the shortest distance t is preferably 10 cm or less, more preferably 10 mm or less. The shortest distance t in the Z direction between the diffuser plate 60 and the glass cloth sheet 65 may be set to, for example, about 4 mm. As shown in FIG. 6, in this embodiment, the reflecting surface 57 is inclined with respect to the XZ plane or the YZ plane so as to be displaced toward the center of the light emitting device 1 as it goes upward in the Z direction. However, the reflective surface may extend substantially parallel to the YZ plane or the XZ plane.

The glass cloth sheet tends to bend and sag under its own weight, making precise positioning difficult. Therefore, it has been conventionally considered unsuitable to use a glass cloth sheet as a translucent member including a light-emitting surface for emitting light to the outside in a light-emitting device (illumination device). That is, conventionally, in the lighting industry, there is no concept of using a glass cloth sheet as a translucent member closest to the light emitting side of a light emitting device (illumination device). ), there is only a product used as a translucent member closest to the light exit side.

However, the present inventor confirmed through tests that when a glass cloth sheet is used as the translucent member closest to the light output side, clear and beautiful light can be emitted even if the glass cloth sheet is slightly bent. did. Therefore, by using the glass cloth sheet as the light-transmitting member closest to the light emitting side, clear and beautiful light can be emitted from the light-emitting device 1. Compared to when used as a Further, if the glass cloth sheet is used as the translucent member closest to the light emitting side, even if the light emitting device 1 is damaged by an earthquake or the like, glass fragments will not scatter. Therefore, the light-emitting device 1 can be remarkably safer than when the tempered glass is used as the translucent member closest to the light output side.

As described above, the light emitting device 1 includes the housing 75, the light source 39 arranged in the housing 75, the fabric woven with glass fiber, and the translucent resin portion covering at least the first surface of the fabric. A glass cloth sheet (translucent sheet) 65 is provided. The glass cloth sheet 65 includes an emission surface 65a through which light from the light source 39 is emitted. The resin portion may cover only the first surface of the fabric, or may have a portion covering the second surface of the fabric in addition to the portion covering the first surface.

According to the light-emitting device 1 of the present disclosure, it is possible to realize a light-emitting device that easily emits clear light, is lightweight, has excellent handleability, and is excellent in safety.

The light emitting device 1 may also include a diffusion plate 60 arranged on the light emitting side of the light source 39 . Also, the glass cloth sheet 65 may be arranged on the light exit side of the diffuser plate 60 .

According to this configuration, it is possible to effectively prevent the composite light source 37 from appearing grainy, and it is easy to produce a beautiful image.

Also, the glass cloth sheet 65 may be arranged with a gap from the diffuser plate 60 .

The inventors of the present application found that when the glass cloth sheet 65 comes into contact with the diffusion plate 60, the glass cloth sheet 65 may be reflected in the image. On the other hand, it has been confirmed that when the glass cloth sheet 65 is arranged on the diffuser plate 60 with an interval, the glass cloth sheet 65 cannot be visually recognized by a person.

According to this configuration, since the glass cloth sheet 65 is spaced from the diffusion plate 60, it is possible to substantially prevent the glass cloth sheet 65 from being reflected in the image. Therefore, clear and beautiful images can be produced.

Also, the shortest distance between the glass cloth sheet 65 and the diffusion plate 60 may be 1 mm or more and 10 cm or less.

According to this configuration, since the shortest distance between the glass cloth sheet 65 and the diffusion plate 60 is 1 mm or more, it is possible to substantially prevent the glass cloth sheet 65 from contacting the diffusion plate 60 even if the glass cloth sheet 65 is bent. Therefore, it is possible to substantially prevent the glass cloth sheet 65 from being reflected in the image, thereby producing a clear and beautiful image. Moreover, since the shortest distance between the glass cloth sheet 65 and the diffusion plate 60 is 10 cm or less, it is easy to realize a compact light emitting device 1 .

Further, the light source 39 includes a plurality of composite LED elements including a red LED element 37a that emits red light, a green LED element 37b that emits green light, and a blue LED element 37c that emits blue light. A light source 37 may be included. Also, the plurality of compound light sources 37 may be mounted in a matrix on the mounting surface of the substrate 36 extending substantially perpendicular to the Z direction. In addition, the light emitting device 1 may also include a reflecting surface 57 arranged between the light source 39 and the diffuser plate 60 and arranged over the entire circumference or substantially the entire circumference of the inner side surface of the housing 75 in the Z direction. good.

According to this configuration, the light emitting device 1 has a plurality of composite light sources 37 arranged in a matrix, and each composite light source 37 includes a red LED element 37a, a green LED element 37b, and a blue LED element 37c. Therefore, any desired image can be generated, and a variety of presentations can be performed. In addition, since the light emitting device 1 has the reflecting surface 57 disposed between the light source 39 and the diffuser plate 60 and disposed over the entire circumference or substantially the entire circumference of the inner side surface of the housing 75, the light can be reflected in four directions. Surface 57 can be illuminated. Therefore, it is possible to generate a spatial image in which a person can easily perceive a sense of depth.

It should be noted that the present disclosure is not limited to the above embodiments and modifications thereof, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents.

For example, in the light-emitting device of the present disclosure, the minimum distance between the glass cloth sheet and the diffusion plate may be greater than 0 and less than 0.1 mm, or greater than 10 cm. Further, in the light-emitting device of the present disclosure, at least part of the glass cloth sheet may contact the diffusion plate.

Further, in the above embodiment, the case where the light emitting device 1 is installed on the ceiling has been described. However, the light emitting device may be installed on the side wall. Specifically, FIG. 7 is a perspective view of a light emitting device 101 of a modified example, and FIG. 8 is a cross-sectional view taken along line AA of FIG. In FIG. 2, the α direction is the depth direction. The α direction coincides with the normal direction of the wall surface of the side wall when the light emitting device 101 is installed on the side wall. Also, the β direction is the width direction. Also, the γ direction is the height direction. The γ direction coincides with the vertical direction when the light emitting device 101 is used as the side wall. The α direction, β direction, and γ direction are orthogonal to each other.

As shown in FIGS. 7 and 8, the light emitting device 101 includes a light source 139, a light reflecting plate 156, and a translucent diffusion plate 160 provided to face the reflecting plate 156. FIG. Also, the distance between the diffusion plate 160 and the reflection plate 156 gradually narrows from the bottom to the top. In addition, the light source 139 is provided below and arranged in a posture of radiating light toward the diffuser plate 160 and the reflector plate 156 . The light source 139 is mounted on the mounting surface (upper surface) of a flat substrate 136 that is substantially parallel to the αβ plane. The light source 139 includes, for example, white light sources 139a and blue light sources 139b alternately arranged in a line at intervals in the β direction. The white light source 139a and the blue light source 139b are mounted on the upper surface of the elongated substrate 136. As shown in FIG.

As shown in FIG. 8, the light emitting device 101 includes a resin or metal housing 175 that is open only on the front side in the α direction, a resin or metal window frame 177 attached to the front side of the housing 175 in the α direction, a resin Alternatively, a metal frame member 178 , a resin or metal spacer 180 and a glass cloth sheet 165 are provided. The glass cloth sheet 165 is, for example, fixed to the back surface of the window frame 177 with double-sided tape over the entire circumference.

The frame-shaped member 178 has an opening having substantially the same opening area as the opening of the window frame 177, and is arranged so that substantially the entire opening overlaps with the opening of the window frame 177 when viewed from the α direction. The glass cloth sheet 165 is held between the rear surface of the window frame 177 and the front surface of the frame member 178 . The spacer 180 is a rectangular parallelepiped member arranged on the upper side inside the housing 175 . The front surface of the spacer 180 contacts the rear surface of the frame member 178, and the rear surface of the spacer 180 presses the upper end portion of the diffusion plate 160 rearward in the α direction.

According to this configuration, diffuser plate 160 emits light with higher luminance as it approaches light source 139 , and emits light with lower luminance as it moves away from light source 139 . That is, light with a gradient in brightness is emitted from the diffusion plate 160 . Therefore, when a person looks at the light-emitting device 101, the light from the glass cloth sheet 165 can sense a gradient of brightness like the actual sky. In addition, by arranging the light source 139, the reflector 156, and the diffusion plate 160 as described above, light is repeatedly diffused and reflected, and light with a sense of perspective (depth) can be emitted from the diffusion plate 160. can. Therefore, according to the light emitting device 1, a pseudo sky (a sky with white clouds floating in a blue sky) can be reproduced with a simple configuration using the white light source 139a and the blue light source 139b. Further, according to this configuration, since the glass cloth sheet 165 is employed as the optical member located closest to the light emitting side, clear and beautiful light can be emitted from the light emitting device 101, and the light emitting device 101 can be significantly improved. It is lightweight, easy to handle, and highly safe.

Note that the light-emitting device of the present disclosure may be a lighting device (lighting fixture) that cannot produce images, and may not have one or both of the reflecting member (reflecting plate) and the diffuser plate. Even in a lighting device that does not have one or both of a reflecting member (reflecting plate) and a diffusing plate, if a glass cloth sheet is used as the optical member positioned closest to the light emitting side, clear and beautiful light can be emitted. It is possible to realize a lighting device that is lightweight, compact, easy to handle, and highly safe.

REFERENCE SIGNS LIST 1,101 light emitting device 2 passageway 3 ceiling 10 cover portion 15 electrical component portion 30 main body portion 35 light source module 36 substrate 37 composite light source 37a red LED element 37b green LED element 37c blue LED element 39,139 light source, 50 optical component mounting portion, 56 reflecting member, 57 reflecting surface, 60,160 diffusion plate, 65,165 glass cloth sheet, 65a emission surface of glass cloth sheet, 70 frame, 71 flange, 75 housing Body 76 Top surface 139a White light source 139b 156 Reflector 175 Housing 177 Window frame 178 Frame member 180 Spacer t Shortest distance between diffusion plate and glass cloth sheet.

Claims (6)

a housing;
a light source disposed within the housing;
a translucent sheet having a woven fabric woven with glass fibers and a translucent resin portion covering at least a first surface of the woven fabric, and including an emission surface from which light from the light source is emitted;
A light emitting device. The light emitting device according to claim 1, wherein the resin portion also covers the second surface of the fabric. A diffusion plate arranged on the light emission side of the light source,
3. The light-emitting device according to claim 1, wherein the sheet is arranged closer to the light exit side than the diffusion plate. 4. The light emitting device according to claim 3, wherein said sheet is spaced apart from said diffusion plate. 5. The light emitting device according to claim 4, wherein the shortest distance between said sheet and said diffusion plate is 1 mm or more and 10 cm or less. wherein the light source comprises a plurality of composite light sources including a red light emitting portion, a green light emitting portion, and a blue light emitting portion;
The plurality of compound light sources are mounted in a matrix on a mounting surface of a substrate extending substantially perpendicularly to the height direction,
6. The reflecting surface according to any one of claims 3 to 5, which is arranged between the light source and the diffusion plate in the height direction, and which is arranged along the entire circumference or substantially the entire circumference of the inner side surface of the housing. 1. The light-emitting device according to claim 1.

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