LED Light Box

Abstract

To provide an LED light box that smoothly illuminates a picture panel with light from a plurality of built-in LEDs, thereby clearly projecting the design of the picture panel. [Solution] An LED light box (10) comprising at least a substrate (2) on which a plurality of LEDs (1) are regularly arranged, a roughly rectangular parallelepiped case (3) for housing the substrate (2), the case (3) having an opening at the top and a bottom surface at the bottom that is slightly larger than the size of the surface of the substrate (2), and a picture panel (4) on which a picture is printed on a transparent resin plate placed as a light-emitting surface in the opening (3P) of the case (3), wherein the ratio (d1:d2) of the distance d1 between adjacent LEDs (1, 1) on the substrate (2) to the distance d2 between the substrate (2) and the picture panel (4) is configured so that the ratio is 1:0.3 to 0.6.

Description

[Technical Field]

[0001] The present invention relates to an LED light box that illuminates a picture panel evenly with the light of multiple built-in LEDs, clearly displaying the design of the picture panel. [Background technology]

[0002] Conventionally, LED light boxes have been used as portable signs with high advertising power, using energy-saving LEDs as solid-state light-emitting elements and no burnout, and have been used in the form of key chains, stickers, straps, etc. (Patent Document 1).

[0003] Also available on the market are miniaturized signboard keychains that use a substrate made up of multiple LEDs to illuminate an advertising panel from the inside, and LED lightbox keychains that illuminate picture panels printed with patterns, pictures, and other designs.

[0004] However, the light box of Patent Document 1 uses a single LED as a solid-state light-emitting element as a light source from one point on the side, which results in uneven and biased light irradiation. Also, in commercially available LED light boxes, the illumination of the picture panel from the multiple built-in LEDs is not uniform, and the shadow of the LED lamp diameter is visible from the outside of the panel, resulting in an unattractive appearance. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3136272 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above points, and aims to provide an LED light box that can smoothly illuminate the entire picture panel so that the light from multiple built-in LEDs is diffused evenly, thereby projecting the design of the picture panel brightly and making it stand out vividly. [Means for solving the problem]

[0007] In order to solve such problems, the present invention provides: A substrate on which multiple LEDs are regularly arranged, a substantially rectangular parallelepiped case for housing the substrate, the case having an opening at the top and a bottom surface at the bottom that is slightly larger than the surface of the substrate; a picture panel having a picture printed on a transparent resin plate placed on the opening of the case as a light-emitting surface, When the illumination angle of the light from the LED is 66°, The ratio of the distance between adjacent LEDs on the substrate to the distance between the substrate and the picture panel is 1:0.3 to 0.6. the law of nature , Used as a keychain, sticker, or strap The present invention provides an LED light box.

[0008] In the present invention, the picture panel preferably has a printed ink layer of the picture on the underside of a transparent acrylic plate as the transparent resin plate.

[0009] In the present invention, it is also preferable that a white ink layer be further provided below the printed ink layer of the design.

[0010] In the present invention, it is also preferable that an adhesive layer be further provided below the printed ink layer or the white ink layer. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide an LED light box that can smoothly illuminate the entire picture panel so that the light from the built-in multiple LEDs is diffused evenly, thereby projecting the design of the picture panel brightly and making it stand out vividly. [Brief explanation of the drawings]

[0013] [Figure 1] Fig. 1(a) is a plan view of an LED light box according to one embodiment of the present invention, omitting the picture panel. Fig. 1(b) is a schematic explanatory diagram showing a cross section of the LED light box of Fig. 1(a) viewed from the right side along the center line with the picture panel attached, together with an image of the shadow of light reflected on the picture panel. [Figure 2] FIG. 2 is a schematic explanatory perspective view showing the structure of a picture panel to be placed in isolation in the LED light box of FIG. 1 in a state where light from one LED is irradiated. [Figure 3] The right side of FIG. 3 is a cross-sectional view showing another LED light box, and the left side of FIG. 3 is a schematic explanatory diagram showing an image of the shadow of light reflected on the picture panel. [Figure 4] Fig. 4(a) is a plan view of another LED light box without the picture panel, and Fig. 4(b) is a schematic explanatory diagram showing a cross section of the LED light box of Fig. 4(a) with the picture panel attached, viewed from the right side at the center line, together with an image of the shadow of light reflected on the picture panel. [Figure 5] FIG. 5 is a photograph showing a state in which an LED light box according to one embodiment of the present invention is turned on and a picture is projected, in comparison with a conventional product. DETAILED DESCRIPTION OF THE INVENTION

[0014] A preferred embodiment of the present invention will be described in detail below with reference to the drawings. One embodiment of the present invention is an LED light box 10, as shown in Figures 1(a) and (b), which comprises a substrate 2 on which multiple LEDs 1, 1...1 are arranged in a regular pattern, a roughly rectangular case 3 for housing the substrate 2, which has an opening 3P at the top and a bottom surface at the bottom that is slightly larger than the surface of the substrate 2, and a picture panel 4 (a filter with a picture) on which a designed picture is printed with ink or the like on a transparent resin plate placed in the opening 3P of the case 3 as a light-emitting surface.

[0015] The LED light box 10 according to this embodiment is characterized in that the ratio of the distance d1 between adjacent LEDs 1, 1 on the substrate 2 to the distance d2 between the substrate 2 and the picture panel 4 is in the range of 1:0.3 to 0.6.

[0016] With the LED light box 10 having such a configuration, the light from the multiple LEDs 1, 1...1 on the substrate 2 built into the case 3 is smoothly and uniformly diffused across the entire picture panel 4, making the design printed on the picture panel 4 appear bright and vivid.

[0017] In this embodiment, as shown in Fig. 1(a), the LEDs 1 are regularly arranged so that the distance d1 between adjacent LEDs 1, 1 (the interval between adjacent LEDs) is substantially the same in both the vertical and horizontal directions when viewed from above. That is, the eight LEDs 1 are arranged on the substrate 2 with two LEDs horizontally and four LEDs vertically at equal intervals d1. Note that the number and arrangement of the LEDs 1 are not limited to this, and any configuration is acceptable as long as the picture panel 4 can be configured to emit light evenly across the entire surface.

[0018] The board 2, which has a plurality of LEDs 1, has its surface fixed to the bottom surface of the case 3 with screws or the like. The board 2, the bottom surface of the case 3, and the picture panel 4 are installed so that their surfaces are parallel to each other. At this time, a predetermined distance d2 is maintained between the board 2 and the picture panel 4.

[0019] As shown in Figure 1(b), when the ratio of d1 to d2 is 1:0.3 to 0.6, and preferably 1:0.4 to 0.5, the overlap of the light shadows 1C on the picture panel 4, which are created by the irradiation angle a of the light from each LED 1, is optimally optimized. This allows the light from all LEDs 1 to be smoothly and evenly diffused across the entire picture panel 4, making the design of the picture panel 4 appear bright and vivid.

[0020] In this embodiment, for example, when the thickness of the case 3 (depth of the built-in portion) is 15 mm, it is particularly preferable that d1 is 15 mm and d2 is 7 mm. These values ​​vary depending on the performance of the LED 1 used, but the LED 1 used may have, for example, a color temperature of daylight white, a Kelvin value of 12,000 K, and an irradiation angle a of 66°.

[0021] 3 shows an LED light box 20 as a comparative example, which does not fall within the range of the ratio of d1 to d2 specified by the present invention. In this LED light box 20, the ratio of the distance d1 between adjacent LEDs 21, 21 on the substrate 22 to the distance d2 between the substrate 22 and the picture panel 24 is d1=1, but exceeds d2=0.6.

[0022] In this case, as shown in Figure 3, the overlapping portion of the light shadow 21C on the picture panel 24, which is created by the irradiation angle of the LED 21, is too large, and although unevenness is reduced, the distance d2 increases because the substrate 22 is located in the battery space (not shown) inside the case 23. As a result, the thickness of the case 23 increases, which is disadvantageous in terms of the product design of the LED light box 20. Specifically, an example of an LED light box 20 is one in which d1 is 15 mm, d2 is 10.5 mm, the distance between the substrate 23 and the bottom of the case 23 is 4.2 mm, and the thickness of the case 23 is 18.5 mm.

[0023] 4(a) and 4(b) show another comparative example of an LED light box 30 that does not fall within the range of the ratio of d1 to d2 defined by the present invention. In this LED light box 30, the ratio of the distance d1 between adjacent LEDs 31, 31 on the substrate 32 to the distance d2 between the substrate 32 and the picture panel 34 is d1=1, but d2=0.3, which is smaller than d1=1.

[0024] In this case, as shown in Figure 4(b), the substrate 32 equipped with the multiple LEDs 31 is positioned close to the picture panel 34, and a light shadow 31C is formed on the picture panel 34 just before the irradiation angle a of the LEDs 31 widens. As a result, the diameter of the LED 31 lamp is visible from the outside of the surface through the picture panel 34, which deteriorates the appearance. Specifically, an example is an LED light box 30 in which d1 is 15 mm, d2 is 3 mm, and the thickness of the case 33 is 15 mm.

[0025] As shown in Fig. 2, the picture panel 4 used in the LED light box 10 of this embodiment uses a transparent acrylic plate (simple transparent acrylic plate) as the transparent resin plate 4B, and has a printed ink layer L1 of a picture on its underside, i.e., the side irradiated with light from the LED 1. Note that Fig. 2 shows the configuration of the picture panel 4, and in reality, the transparent resin plate 4B and printed ink layer L1 are integrated with a white ink layer L2 and an adhesive layer L3, which will be described later, but the individual layers are shown separated to make the configuration easier to understand.

[0026] The method for forming the printed ink layer L1 of the design is not particularly limited, and it can be formed by, for example, inkjet printing, offset printing, on-demand printing, sublimation printing (transfer), silk printing, or the like.

[0027] Examples of images that can be expressed using the printing ink layer include photos of fans of singers, actors, and other entertainers, idols, characters from animation works, and objects used in limited locations such as concerts and anime festivals. For example, each idol can be used as a motif, and users can select and use their favorite one.

[0028] The design may be a letter, a symbol, a figure, a logo, a mark, a design pattern, a picture, etc. The design may be a single design or a mixture of multiple designs.

[0029] Furthermore, it is preferable that the picture panel 4 further includes a white ink layer L2 below the printed ink layer L1. The white ink layer L2 whitens the background of the picture, highlighting the printed color and allowing the light from the LED 1 to spread. This allows the light from the LED 1 to shine more evenly onto the picture panel 4. The white ink layer L2 can be formed using white ink in the same manner as the printed ink layer L1.

[0030] Furthermore, the picture panel 4 preferably further comprises an adhesive layer L3 below the printed ink layer L1 or white ink layer L2 provided on the transparent resin plate 4B. The adhesive layer L3 is used to close the opening 3P above the case 3 and adhere to the periphery of the opening 3P in the case 3, and is preferably made of double-sided tape or the like. The uneven surface of this adhesive layer L3 diffuses and scatters the light from the LEDs 1, allowing the light to be illuminated even more evenly onto the picture panel 4.

[0031] As described above, the picture panel 4 is provided with the printed ink layer L1, then the white ink layer L2, and then the adhesive layer L3 on the transparent resin plate 4B, which gradually blurs the optical axis of the LED 1. This further enhances the light diffusion effect of the LED 1.

[0032] The LED light box 10 of this embodiment is used in the form of, for example, a key holder, a sticker, a strap, or the like, for ease of use by the user.

[0033] The photograph on the right of Figure 5 shows the state in which the LED light box 10 of the present invention (configuration shown in Figure 1) is turned on and a picture is projected, and the photograph on the left of Figure 5 shows the state in which the LED light box of the comparative product is turned on and a picture is projected. The comparative LED light box used here has a ratio of the distance d1 between adjacent LEDs on the board to the distance d2 between the board and the picture panel, as shown in Figure 4, such that d1 = 1 and d2 = 0.3, which is smaller.

[0034] As shown in Figure 5, the LED light box of the present invention illuminates the entire picture panel evenly and diffuses light, making the design of the picture panel appear bright and vivid. In contrast, with the LED light box of the comparison product, the diameter of the LED lamp is visible through the picture panel from the outside surface, making it look unattractive.

[0035] The LED light box of the present invention also has a two-stage power switch that allows the brightness to be adjusted between high and low, providing an excellent feature not found in conventional commercially available LED light boxes. [Industrial Applicability]

[0036] To provide an LED light box that can be used industrially as an LED light box that can project the design of a picture panel and make it stand out brightly and vividly by smoothly illuminating the entire picture panel with a plurality of built-in LEDs so as to diffuse the light evenly. [Explanation of symbols]

[0037] 10...LED light box of the present invention 1...LED 1C...Light Contrast 2... Circuit board 3. Case 3P...Case opening 4...Picture panel 4B: Transparent resin plate, L1: Picture ink layer, L2: White ink layer, L3: Adhesive layer a...LED light emission angle d1: Distance between adjacent LEDs d2: Distance between the board and the picture panel 20,30...Comparative example LED light box 21,31...LED 21C, 31C...Light Contrast 22, 32... PCB 23,33...case 24, 34...Picture panels

Claims

1. a substrate on which a plurality of LEDs are regularly arranged; a substantially rectangular parallelepiped case for housing the substrate, the case having an opening at the top and a bottom surface at the bottom that is slightly larger than the surface of the substrate; a picture panel having a picture printed on a transparent resin plate placed on the opening of the case as a light-emitting surface, The LED light box is characterized in that, when the irradiation angle of light from the LEDs is 66°, the ratio of the distance between adjacent LEDs on the substrate to the distance between the substrate and the picture panel is 1:0.3 to 0.6, and is used in the form of a key chain, a sticker, or a strap.

2. The LED light box according to claim 1 , wherein the picture panel has a printed ink layer of the picture on the underside of a transparent acrylic plate as the transparent resin plate.

3. The LED light box according to claim 2 , further comprising a white ink layer below the printed ink layer of the design.

4. The LED light box according to claim 3 , further comprising an adhesive layer below the printed ink layer or the white ink layer.

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