Design light-emitting device

Abstract

To provide a design light-emitting device that achieves both drainage and designability.SOLUTION: A design light-emitting device 1 comprises: an optical design member 2 in which a light-emitting surface 2a is formed in a shape of expressing a character, a symbol, a graphic form or a pattern, or in an inverted shape thereof, and which transmits or diffuses light; a light source 5 for irradiating the optical design member 2 with light from a rear side of the light-emitting surface 2a; a housing 3 including an opening along the shape of the optical design member 2 and supporting the optical design member 2 and the light source 5; a drainage hole 30 which is formed in a side wall 3b of the housing 3 to drain a fluid having intruded to an internal space 100 defined by the housing 3 and the optical design member 2, to the outside; and a light leakage preventive tool 10 with shading walls 11, 12 that are erected on an inner peripheral surface of the housing 3 in between the light source 5 and the drainage hole 30, and that block the light from the light source 5 so that it does not reach the drainage hole 30. In the light leakage preventive tool 10, there is formed a water passage R by which the internal space 100 and the drainage hole 30 communicate.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a decorative light-emitting device that can be used for illuminated signs and illuminated advertisements, for example, for displaying store names, product names, service names, logos, and the like. [Background technology]

[0002] Conventionally, there have been provided decorative light-emitting devices used as illuminated signs or illuminated advertisements that brightly display store names or logos. Such decorative light-emitting devices diffuse light from a light source using a front panel to emit diffused light, thereby brightly displaying store names, logos, etc. Because these decorative light-emitting devices are highly visible and beautiful, they are used in a variety of places, such as displaying brand names at the front or entrance of brand stores.

[0003] Such decorative light-emitting devices have traditionally been used in the form of neon signs, but in recent years, LED signs using LEDs as light sources have been proposed, and various designs are being sought.

[0004] Here, as one type of decorative light-emitting device, a decorative light-emitting device (box-shaped letter sign) has been proposed, which is configured in a box shape with an internal space and includes a display unit made of a transparent or translucent resin material, side panels covering the outer edges of the display unit, and a bottom panel closing the back side of the display unit.

[0005] However, conventional design light emitting devices are designed so that water flowing in from the outside accumulates in the internal space, which can submerge electronic components such as the light source and control board, potentially causing malfunction.On the other hand, simply providing drainage holes at the bottom ends of the side panels causes light leakage from the drainage holes, which impairs the original performance (design) of the design light emitting device. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-072053 Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above-mentioned problems, an object of the present invention is to provide a light-emitting device with a design that can achieve both drainage properties and design. [Means for solving the problem]

[0008] This invention is characterized by comprising an optical design element whose light-emitting surface is formed in a shape representing a letter, symbol, figure, or pattern, or the inverse shape of these, and which transmits or diffuses light; a light source that irradiates light onto the optical design element from the back side of the light-emitting surface; a housing that has an opening that follows the shape of the optical design element and supports the optical design element and the light source; a drain hole formed in the side wall of the housing for discharging liquid that has entered the internal space defined by the housing and the optical design element to the outside; and a light leakage prevention device that is erected on the inner surface of the housing between the light source and the drain hole and has a light-shielding wall that blocks light from the light source from reaching the drain hole, and the light leakage prevention device has a water passage formed in it that connects the internal space and the drain hole. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a light emitting device with a design that is capable of achieving both drainage properties and design. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a front view showing the configuration of a decorative light emitting device of the present invention. [Figure 2] FIG. 2 is a bottom view showing the configuration of the decorative light emitting device. [Figure 3] FIG. 2 is a partially enlarged cross-sectional view showing the configuration of the decorative light-emitting device. [Figure 4] FIG. 10 is a bottom view showing the relationship between the light leakage prevention tool and the drainage holes. [Figure 5]FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 10 is an explanatory diagram showing a method for attaching the light leakage prevention device. [Figure 9] FIG. 10 is a front view of a modified example of a decorative light emitting device. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will now be described with reference to the drawings.

[0012] Fig. 1 is a front view showing the configuration of the designable light emitting device 1 of the present invention. Fig. 2 is a bottom view showing the configuration of the designable light emitting device 1. Fig. 3 is a partially enlarged cross-sectional view showing the configuration of the designable light emitting device 1. Note that in the following figures, wiring connected to the light source and fixing members for fixing each component are omitted.

[0013] As shown in Figures 1 to 3, the decorative light-emitting device 1 of the present invention is a light-emitting device used for illuminated signs and illuminated advertisements, for example, for displaying store names (brand names), product names, service names, or logos, and mainly comprises an optical design component 2, a housing 3, a substrate 4, and a light source 5.

[0014] When viewed from the front, the optical design component 2 is formed in a shape that represents a letter, symbol, figure, or pattern that indicates the content of the illuminated sign or illuminated advertisement, or the reverse shape of these. The decorative light-emitting device of the present invention can be applied to various characters, etc., but in the decorative light-emitting device 1 of this embodiment, the optical design component 2 is formed in the shape of the Roman letter "V," which is a type of serif font.

[0015] The optical design component 2 is a milky white (semi-transparent white) plate-shaped component made of, for example, acrylic resin. Note that the optical design component 2 is not limited to acrylic resin, and can be made of any suitable material that diffuses and transmits light, such as glass or resin materials other than acrylic.

[0016] Furthermore, the optical design component 2 can be transparent, but is preferably translucent. The optical design component 2 transmits or diffuses some or all of the light from the light source 5 arranged on the back side to the front side. Therefore, the front (surface) of the optical design component 2 functions as a light-emitting surface (light-emitting surface) 2a that is visible by emitting light due to the light transmitted from the back side to the front side. Furthermore, the optical design component 2 can also be said to function as an optical design part that is formed in a shape representing letters, figures, or patterns, or the inverse shape of these, and transmits or diffuses light.

[0017] In this embodiment, the optical design component 2 is formed as a single layer structure using acrylic resin of the same color, but it can also be a multiple layer structure with a transparent translucent plate (translucent panel) on the front side and a translucent diffusion plate (diffusion panel) on the back side.

[0018] The corners of the edge on the front side of the optical design component 2 may be chamfered in an arc shape (R-chamfered). In this embodiment, an R-chamfered portion 2b is formed at the corner of the edge on the front side (see Figure 3). The corners of the edge on the front side may also be tapered chamfered by chamfering them in a straight line.

[0019] A convex portion 2c that protrudes toward the rear side is formed on the rear side of the optical design component 2. The side wall of the convex portion 2c is formed a certain distance (offset distance) inward from the outer contour of the optical design component 2. The offset distance is the same as the thickness of the housing 3 (side wall 3b) or is longer than the thickness of the housing 3 (side wall 3b). In addition, the thickness of the convex portion 2c can be 1 / 4 or more of the overall thickness of the optical design component 2, and it is preferable that it be 1 / 3 or more.

[0020] The housing 3 has approximately the same shape as the optical design component 2 (protrusion 2c) when viewed from the front, and is a component attached to the back side of the optical design component 2. The housing 3 mainly has a rear wall 3a and a side wall 3b.

[0021] The rear wall 3a is a plate-like member having approximately the same shape (approximately the same contour and size) as the optical design component 2 (protrusion 2c). The side wall 3b is a plate-like member that stands vertically from the edge of the rear wall 3a toward the front side. The dimensions of the side wall 3b in the front-to-rear direction are constant. Therefore, the housing 3 has an opening on the front side that is approximately the same shape as the optical design component 2 (following the shape of the optical design component 2), and is formed with a U-shaped cross section, with the rear wall 3a and side wall 3b covering all but the front side.

[0022] The housing 3 is made of a metal material such as stainless steel (SUS). The inner surfaces of the housing 3 (rear wall 3a and side wall 3b) are painted or printed in glossy white. This white paint functions as a reflective surface that reflects light. Note that a white film may be provided instead of the white paint.

[0023] As shown in Figure 3, the inner surface of the side wall 3b that forms the opening of the housing 3 has a shape that corresponds to the contour shape of the convex portion 2c of the optical design component 2 (a shape that is offset a certain distance from the outer contour of the optical design component 2), and is configured so that the convex portion 2c of the optical design component 2 can be fitted snugly into the opening of the housing 3. Therefore, by fitting the convex portion 2c of the optical design component 2 into the opening of the housing 3, the optical design component 2 covers the opening of the housing 3, and an internal space 100 defined by the housing 3 and the optical design component 2 is formed.

[0024] In addition, a fixing portion 6 for attaching the optical design component 2 to the housing 3 is provided at an appropriate position on the back side of the optical design component 2. This fixing portion 6 is fixed to the optical design component 2 on the front side, and is formed in a plate shape along the inner peripheral surface of the side wall 3b of the housing 3. The fixing portion 6 can be formed integrally with the optical design component 2, or can be configured as a separate component (separate body) from the optical design component 2.

[0025] A fastening through-hole is formed in the side wall 3b of the housing 3 at a position corresponding to the fixing portion 6, and the fixing portion 6 is fixed to the side wall 3b of the housing 3 by an appropriate fastening member. However, the fastening through-hole formed in the side wall 3b is blocked by the head of the fastening member, a washer, or the like.

[0026] When the fixing part 6 is constructed separately from the optical design component 2, the material of the fixing part 6 can be formed from resin such as polycarbonate, PVC (polyvinyl chloride), PET (polyethylene terephthalate), plastic, or acrylic. Furthermore, in order to mechanically and stably fix the optical design component 2 to the housing 3, a material with the same or higher elasticity than the material of the optical design component 2 is preferable. Furthermore, it is preferable that the fixing part 6 is made of a translucent or transparent material with a light transmittance equal to or greater than that of the optical design component 2 so that the fixing part 6 is not visible from the light-emitting surface 2a.

[0027] The substrate 4 is fixed to the rear wall 3a of the housing 3 by a predetermined fixing member (such as a fastening member). A plurality of light sources 5 are provided on the front surface (surface) of the substrate 4. Each of the plurality of light sources 5 is arranged so that its optical axis extends in the forward direction. The light sources 5 may be linear light sources or multiple point light sources. The light sources 5 are, for example, LEDs, but are not limited to this. Any suitable light source can be used, such as a neon tube, a flexible substrate having a light-emitting portion, or a light guide plate that guides light from the light-emitting portion. The light sources 5 are electrically connected to a power source by an electric wire (not shown) and emit light upon receiving power from the power source. The surface of the substrate 4 is painted or printed in glossy white. Note that a white film may be provided on the surface of the substrate 4 instead of the white paint.

[0028] When the light source 5 emits light, most of the light emitted from the light source 5 travels toward the front side and enters the optical design component 2 from the back side. Furthermore, light that does not travel directly toward the front side is reflected by the surface of the substrate 4 or the inner surface of the housing 3 (side wall 3b) and travels toward the front side, before entering the optical design component 2 from the back side. Therefore, the light source 5 is configured to irradiate the optical design component 2 with light from the back side of the light-emitting surface 2a. Furthermore, the light from the light source 5 enters the optical design component 2 as a spread surface light, is further diffused within the optical design component 2, and is irradiated to the outside from the optical design component 2 as a substantially uniform surface light. Therefore, the light-emitting surface 2a emits light with a substantially uniform brightness, and a luxurious design light-emitting device 1 can be provided.

[0029] In a design light-emitting device 1 configured as described above, liquid such as rainwater may flow into the internal space 100 from the outside through gaps between the optical design components 2. Liquid remaining in the internal space 100 may submerge the light source 5 and electronic components on the board 4, causing them to malfunction. On the other hand, simply providing drainage holes at the bottom end (side wall 3b) of the internal space 100 causes light leakage from the drainage holes, which impairs the design.

[0030] The inventors have conducted extensive research to achieve both drainage and design, and have succeeded in creating a designable light-emitting device 1 that achieves both drainage and design. The following describes the configuration of the designable light-emitting device 1 with regard to drainage and prevention of light leakage, which are the main aspects of the present invention.

[0031] Fig. 4 is a bottom view showing the relationship between the light leakage prevention device 10 and the drainage holes 30. Fig. 5 is a bottom view showing the configuration of the light leakage prevention device 10. Fig. 6 is a side view showing the configuration of the light leakage prevention device 10.

[0032] As shown in Figures 2 and 4, the side wall 3b of the housing 3 is provided with a drain hole 30 for draining liquid that has entered the internal space 100 defined by the housing 3 and the optical design component 2 to the outside. The drain hole 30 is provided at the bottom of the area of ​​the internal space 100 where liquid accumulates (liquid accumulation area). In this embodiment, the internal space 100 has the shape of the letter "V" when viewed from the front, so the entire space forms a single liquid accumulation area. For this reason, in this embodiment, one drain hole 30 is provided at the bottom of the shape of the letter "V" (liquid accumulation area).

[0033] The shape of the drainage holes 30 is not particularly limited as long as it is a shape that allows liquid to be discharged to the outside. In this embodiment, the drainage holes 30 are circular through-holes, so that liquid can be efficiently discharged to the outside from various directions.

[0034] The size of the drainage holes 30 is not particularly limited as long as it is large enough to allow liquid to be smoothly discharged to the outside. For example, from the viewpoint of liquid discharge (drainage), the minimum diameter or width of the drainage holes 30 can be 2 mm or more, preferably 4 mm or more, and more preferably 6 mm or more. On the other hand, since larger drainage holes 30 increase the risk of light leakage, from the viewpoint of preventing light leakage, the maximum diameter or width of the drainage holes 30 can be 10 mm or less, preferably 8 mm or less, and more preferably 6 mm or less.

[0035] The decorative light emitting device 1 is provided with a light leakage prevention device 10 which is erected on the inner surface of the housing 3 between the light source 5 and the drain hole 30 and has light blocking walls 11, 12 which block light from the light source 5 from reaching the drain hole 30.

[0036] As shown in FIGS. 4 to 6 , the light leakage prevention device 10 includes light-shielding walls 11 and 12 and a connecting plate 13. The light-shielding walls 11 and 12 include a pair of first walls 11 facing each other in a first direction and a pair of second walls 12 facing each other in a second direction intersecting the first direction. Because the walls are provided in two different directions, the light emitted from the light source 5 does not directly enter the area surrounded by the pair of first walls 11 and the pair of second walls 12. The light leakage prevention device 10 is disposed such that the water drainage hole 30 is located in the area surrounded by the pair of first walls 11 and the pair of second walls 12. Therefore, the pair of first walls 11 and the pair of second walls 12 function as walls (light-shielding walls) that block the light from the light source 5 from reaching the water drainage hole 30.

[0037] Furthermore, the lower ends of the pair of first walls 11 and the pair of second walls 12 abut against the side walls 3b of the housing 3. In other words, there is no gap between the light leakage prevention device 10 (the pair of first walls 11 and the pair of second walls 12) and the inner circumferential surface of the housing 3. For example, the lower ends of the pair of first walls 11 and the pair of second walls 12 are attached to the side walls 3b of the housing 3 with an adhesive, double-sided tape, or the like.

[0038] The connecting plate 13 is formed in a generally plate-like shape that is larger than the drainage holes 30, and is formed so as to cover the upper parts of the pair of first walls 11 and the pair of second walls 12 (the entire pair of first walls 11 and the pair of second walls 12 when viewed from above). The lower surface of the connecting plate 13 is formed continuous with the upper ends of the pair of first walls 11 and the pair of second walls 12, and supports the pair of first walls 11 and the pair of second walls 12 so that each of the pair of first walls 11 and the pair of second walls 12 is arranged in a predetermined manner. In addition, since the connecting plate 13 covers the drainage holes 30 from above, it also functions as a light-shielding wall.

[0039] Furthermore, the pair of second walls 12 are arranged within the width of the pair of first walls 11. That is, the pair of second walls 12 are arranged so as to fit within the range of the pair of first walls 11 in the left-right direction. This allows the pair of first walls 11 and the pair of second walls 12 to be arranged efficiently, and the light leakage prevention device 10 can be made smaller.

[0040] Furthermore, the pair of first walls 11 are arranged to cover the gap between the pair of second walls 12. Therefore, light incident on the light leakage prevention device 10 hits either the pair of first walls 11 or the pair of second walls 12, and therefore light emitted from the light source 5 does not directly enter between the pair of second walls 12.

[0041] Furthermore, each of the pair of first walls 11 and the pair of second walls 12 is configured to curve outward in the opposing direction. That is, each of the pair of first walls 11 is configured to curve outward in a first direction (front-rear direction). Furthermore, each of the pair of second walls 12 is configured to curve outward in a second direction (left-right direction). This allows the pair of first walls 11 and the pair of second walls 12 to be arranged more efficiently and the light leakage prevention device 10 to be made smaller than when flat light-shielding walls 11, 12 are provided.

[0042] 5, the light leakage prevention device 10 is provided with a water passage R that connects the internal space 100 and the water drainage hole 30. As a result, liquid that has flowed into the internal space 100 flows downward, passes through the water passage R in the light leakage prevention device 10, reaches the water drainage hole 30, and is discharged (drained) from the water drainage hole 30 to the outside.

[0043] In particular, the outer surfaces (outer surfaces) 12a of the pair of second walls 12 are inclined surfaces when viewed from the left-right direction (the opposing direction of the pair of second walls 12). Therefore, the outer surfaces 12a do not directly face the direction of movement of the liquid flowing into the water passage R, and the flow of the liquid is not obstructed, thereby improving drainage performance.

[0044] Furthermore, at least the surface of the light leakage prevention device 10 is black. That is, the surfaces of the light-shielding walls 11, 12 and the connecting plate portion 13 are black. In this embodiment, the light leakage prevention device 10 is formed of a black material and is entirely black. In this manner, although light from the light source 5 may enter the water passage R, when the light hits the surfaces of the light-shielding walls 11, 12 and the connecting plate portion 13, the light is absorbed by the surfaces of the light leakage prevention device 10 and is not reflected, so the light does not penetrate further. Therefore, it is possible to prevent light from the light source 5 from reaching the water drainage hole 30.

[0045] Furthermore, the pair of second walls 12 have opposing circumferential surfaces (hereinafter referred to as "inner circumferential surfaces") that are concentric (have the same central axis) and curved at a constant curvature. Specifically, the inner circumferential surfaces of the pair of second walls 12 are like a cut-out portion of the circumferential surface of the same cylinder. The inner diameter of the inner circumferential surfaces of the pair of second walls 12 is the same as or slightly larger than the diameter or width of the water drain hole 30. Furthermore, the light leakage prevention device 10 is arranged so that the central axis of the inner circumferential surfaces of the pair of second walls 12 coincides with the center of the water drain hole 30. In other words, the pair of second walls 12 are configured to surround the periphery of the water drain hole 30. Therefore, if light from the light source 5 does not enter between the pair of second walls 12, light from the light source 5 will not enter the water drain hole 30.

[0046] As described above, the designable light emitting device 1 of the present invention is provided with a light leakage prevention device 10 that is erected on the inner peripheral surface of the housing 3 between the light source 5 and the water drainage hole 30 and has light-shielding walls 11, 12 that block light from the light source 5 from reaching the water drainage hole 30, and the light leakage prevention device 10 is provided with a water passage R that connects the internal space 100 and the water drainage hole 30. This allows liquid that has accumulated in the internal space 100 to be drained through the water drainage hole 30 and prevents light leakage from the water drainage hole 30, achieving a high level of design. In other words, the designable light emitting device 1 of the present invention is able to achieve both drainage and design. In more detail, the light leakage prevention device 10 covers the opposing inner surfaces of the drainage hole 30 with the connecting plate 13 to provide light shielding, covers the two opposing inner periphery surfaces of the drainage hole 30 with the two light-shielding walls 11 to provide light shielding, and further covers the two opposing inner periphery surfaces of the drainage hole 30 where the light-shielding walls 11 are not provided with the light-shielding walls 12 to provide light shielding, thereby preventing light from leaking outward from the water drainage hole 30 in all directions even if light from the light source 5 is diffused inside the design light-emitting device 1. In particular, the outer ends of the two opposing curved light-shielding walls 12 are positioned close to the line connecting the inner ends of the two opposing curved light-shielding walls 11, and both ends of the light-shielding walls 12 are thick, thereby realizing a structure in which light does not hit the inner surfaces of the light-shielding walls 12, as shown by the arrow Y in FIG. 5. This reliably prevents light leakage.

[0047] As shown in FIGS. 7 and 8 , it is desirable to prepare a positioning member 20 for positioning the light leakage prevention device 10 when attaching the light leakage prevention device 10 to the housing 3. The positioning member 20 has a columnar or cylindrical main body 21 and a columnar or cylindrical head 22. The minimum diameter or width of the main body 21 is larger than the maximum diameter or width of the drainage hole 30. The contour shape of the head 22 is similar to the contour shape of the drainage hole 30, and the diameter or width of the head 22 is smaller than the diameter or width of the drainage hole 30. Therefore, as shown in FIG. 8 , the head 22 can be inserted into the drainage hole 30. In this state, by installing the positioning member 20 so that the head 22 is positioned between the pair of second walls 12, the positioning member 20 can be positioned appropriately with respect to the drainage hole 30.

[0048] The design light emitting device in this invention corresponds to the design light emitting device 1, and similarly, the light emitting surface corresponds to the light emitting surface 2a, the optical design member corresponds to the optical design member 2, the light source corresponds to the light source 5, the housing corresponds to the housing 3, the internal space corresponds to the internal space 100, the drain hole corresponds to the drain hole 30, the light shielding wall corresponds to the light shielding walls 11 and 12, the light leakage prevention device corresponds to the light leakage prevention device 10, the pair of first walls corresponds to the pair of first walls 11, and the pair of second walls corresponds to the pair of second walls 12. However, this invention is not limited to this embodiment and can be various other embodiments. Furthermore, the specific configurations etc. listed in the above embodiment are examples and can be changed as appropriate depending on the actual product.

[0049] Furthermore, while the rear wall 3a of the housing 3 of the design light-emitting device 1 is often fixed to the installation surface, this is not a limitation; the device may be flipped over and the optical design component 2 may be fixed facing the installation surface at a slight distance from the installation surface. In this case, it is advisable to form the desired letters, figures, or patterns in a shape that is reversed left to right. This allows for a design in which the periphery of the desired letters, figures, or patterns is illuminated when viewed from the front side (viewing surface side). Furthermore, when flipped over like this, a transparent plate may be used for the optical design component 2 instead of a diffusion plate. If a transparent plate is used, strong direct light can be irradiated from the optical design component 2 of the design light-emitting device 1 onto the installation surface, improving visibility.

[0050] Furthermore, in the above-described embodiment, an example was given in which a single drain hole 30 was provided at the bottom. However, if there are multiple liquid retention zones, a drain hole 30 is provided in each liquid retention zone. For example, as shown in FIG. 9, if the optical design component 2 and the housing 3 are formed in the shape of the letter "N," the left vertical bar and the remaining portions (the diagonal line portion and the right vertical bar portion) each become liquid retention zones, and drain holes 30 are provided at the bottom end of the left vertical bar portion and at the bottom end where the diagonal line portion and the right vertical bar portion connect. Accordingly, light leakage prevention devices 10 are provided around each drain hole 30. In this way, the same effect as in the above-described embodiment can be obtained.

[0051] In addition, in the above-described embodiment, the optical design component 2 has been described as having chamfered corners on the front edge, but this is not necessarily limited to this. For example, the corners of the front edge of the optical design component 2 do not have to be chamfered (the thickness of the optical design component 2 may be constant up to the front edge). Even in this case, the same effect as in the above-described embodiment can be obtained. [Industrial Applicability]

[0052] The present invention can be used in the industry of decorative light-emitting devices used for illuminated signs and illuminated advertisements for store names, product names, service names, logos, and the like. [Explanation of symbols]

[0053] 1...Designable light-emitting device 2...Light design components 2a...Light-emitting surface 3. Housing 3a…Back wall 3b…Side wall 30...Drain hole 4...Substrate 5...Light source 10...Light leakage prevention device 11…First wall 12…Second wall 13...Connection plate 100...interior space R…Waterway

Claims

1. An optical design component whose light-emitting surface is formed in a shape representing a character, symbol, figure, or pattern, or in the inverse shape of these, and transmits or diffuses light; a light source that irradiates the optical design component with light from the back side of the light-emitting surface; A housing having an opening along the shape of the optical design element and supporting the optical design element and the light source; A drain hole formed in the side wall of the housing for discharging liquid that has entered the internal space defined by the housing and the optical design member to the outside; a light leakage prevention device that is erected on the inner peripheral surface of the housing between the light source and the water drain hole and has a light blocking wall that blocks light from the light source from reaching the water drain hole, The light leakage prevention device has a water passage formed therein that connects the internal space and the drain hole. A designable light-emitting device.

2. the light-shielding wall has a pair of first walls facing each other in a first direction and a pair of second walls facing each other in a second direction intersecting the first direction, The pair of second walls are disposed within the width of the pair of first walls. The decorative light-emitting device according to claim 1.

3. The pair of first walls are arranged to cover the gap between the pair of second walls. The decorative light-emitting device according to claim 2.

4. The pair of first walls and the pair of second walls are each configured to be curved outward in opposing directions. The decorative light-emitting device according to claim 3.

5. The light leakage prevention tool has a black surface and is disposed at a distance from the optical design component. The decorative light emitting device according to claim 1 .

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