JP2007279324A - Signboard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signboard capable of emitting light sufficiently on all the surface of a translucent plate (display part) to which a display function is given. <P>SOLUTION: A signboard 1 includes a synthetic resin foam sheet 2 having a plurality of through holes 12 arranged two-dimensionally at prescribed spacings, LED elements 20 disposed on an inner side of respective through holes 12, and a translucent acrylic plate as the display part disposed in front of the synthetic resin foam sheet 2. The display part of the signboard 1 is free from irregularities and is beautiful though the LED elements 20 are arranged with spacing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a signboard using LEDs.

  The thing of the following patent document 1 is known as a light-guide plate which can be used for the conventional signboard. This light guide plate is formed by sticking a foamed synthetic resin sheet on one surface of a transparent synthetic resin plate.

JP 2006-39494 A

  In such a light guide plate, in order to obtain a sufficient amount of light emission over the entire surface, many LEDs are required, and the installation configuration, power supply configuration, and the like become complicated. Further, in the case of a light guide plate having a large size, there is a possibility that the central portion becomes dark.

  Accordingly, an object of the present invention is to provide a signboard that can emit light sufficiently on the entire surface of a translucent plate (display unit) to which a display function is given.

  In order to achieve the above object, the invention according to claim 1 is a foamed synthetic resin sheet having a plurality of through holes in two dimensions at predetermined intervals, an LED disposed inside each through hole, and foaming. And a translucent plate disposed in front of the synthetic resin sheet.

  In addition to the above object, the invention described in claim 2 has a predetermined interval of 10 mm or more and 30 mm or less in order to achieve the object of efficiently obtaining sufficient light emission even with a small number of LEDs.

  In addition to the above-mentioned object, the invention described in claim 3 has a back plate fixed to the rear surface of the foamed synthetic resin sheet and a through-hole in order to achieve the purpose of more efficiently and uniformly emitting light. It is formed so as to be continuous with the plate, and at least the back plate portion of the through hole is formed in a tapered shape extending forward.

  The invention described in claim 4 is characterized in that, in addition to the above object, the LED protrudes from the through hole in order to achieve the object of emitting light more efficiently and uniformly.

  In addition to the above-mentioned object, the invention according to claim 5 has an LED mounted on the substrate and a foamed synthetic resin sheet on the front side of the substrate in order to achieve the object of low cost and efficient configuration. Is characterized by being fixed.

  According to the first aspect of the present invention, the foamed synthetic resin sheet having a plurality of through holes in two dimensions at predetermined intervals, the LED disposed inside each through hole, and the front of the foamed synthetic resin sheet And a translucent plate to be disposed. Therefore, the light emitted from the LED can be diffused by the foamed synthetic resin sheet, and even if the LEDs are arranged at an interval, it is possible to obtain a clean display portion without unevenness.

  According to the second aspect of the present invention, the predetermined interval is 10 mm or more and 30 mm or less, and in addition to the above effect, in the LED exhibiting general luminance, the display unit can emit light uniformly. Even if it is a wide display part, there is an effect that the number of LEDs can be reduced.

  According to the invention described in claim 3, the back plate is fixed to the rear surface of the foamed synthetic resin sheet, and the through hole is formed so as to continue to the back plate, and at least the back plate of the through hole is formed. Since the part is formed in a tapered shape that spreads forward, the light emission of the LED can be guided obliquely forward, and the light forward obliquely causes the display part to emit light, and is reflected by the display part to produce foam synthesis. Since it reaches the resin sheet, there is an effect that it contributes to uniform light emission of the display unit.

  According to the invention described in claim 4, since the LED protrudes from the through hole, in addition to the above effect, part of the light emission of the LED can reach the foamed synthetic resin sheet directly. There is an effect that it is possible to provide beautiful light emission of the display portion by positively utilizing reflection by the resin sheet.

  According to the invention described in claim 5, the LED is mounted on the substrate, and the foamed synthetic resin sheet is fixed to the front side of the substrate. There is an effect that the configuration of the signboard for doing so can be made compact at low cost.

  Hereinafter, a signboard according to an embodiment of the present invention will be described with reference to the drawings as appropriate. FIG. 1A is an explanatory front view of the inside of the signboard 1, FIG. 1B is a sectional view of the LED element section of FIG. 1A, and the signboard 1 is placed inside a machine frame (not shown). The foamed synthetic resin sheet 2 and the LED substrate 4 are provided.

  The foamed synthetic resin sheet 2 is obtained by foaming PET (polyethylene terephthalate) with a cell rate of 80%, and is a rectangular member having an average cell diameter of about 10 μm. On the rear surface of the foamed synthetic resin sheet 2, a metal back plate 10 having the same dimensions as the sheet except for the thickness is fixed with the sides aligned. The through-holes 12 are opened in a plurality of circles in two dimensions at predetermined intervals from the foamed synthetic resin sheet 2 to the back plate 10, and more specifically, on the vertical and horizontal sides of the foamed synthetic resin sheet 2. They are arranged on the line along with a predetermined interval, in other words, arranged at lattice points with a predetermined interval. Here, the predetermined interval is 30 mm (millimeters). The portion of the through hole 12 in the back plate 10 is formed in a tapered shape that spreads forward.

  The LED substrate 4 is electrically connected to a power supply unit (not shown) on the rear side of the signboard 1 and can turn on a plurality of LED elements (light emitting diodes) 20 mounted thereon. The LED substrate 4 has the same dimensions as the foamed synthetic resin sheet 2 and the back plate 10 except for the thickness, and the LED elements 20 are arranged so as to correspond to the through holes 12. The LED substrate 4 is fixed on the rear side of the back plate 10 with the back plate 10 and the side aligned. At this time, each LED element 20 is located inside the corresponding through hole 12. The size of the through hole 12 is larger than that of the LED element 20. Each LED element 20 protrudes forward from the front surface of the through hole 12.

  And in the signboard 1, most of the front of the machine frame (not shown) is a translucent milky acrylic plate that is almost the same size as the LED substrate 4 except for the thickness, and the foamed synthetic resin sheet 2 and the like are accommodated in parallel therewith. The acrylic plate portion is a display unit capable of emitting light.

  In the signboard 1 described above, a foamed synthetic resin sheet 2 having a plurality of through holes 12 two-dimensionally at predetermined intervals, an LED element 20 disposed inside each through hole 12, and the front of the foamed synthetic resin sheet 2 And a translucent acrylic plate serving as a display unit disposed on the surface, the light emitted from the LED element 20 can be diffused by the foamed synthetic resin sheet 2, even if the LED elements 20 are disposed at intervals. A beautiful display portion without unevenness can be obtained.

  In addition, since the LED elements 20 are arranged at grid points and the vertical and horizontal intervals of the grid are set to 30 mm, the LED elements 20 exhibiting general luminance can emit light uniformly on the display unit. Even in a wide display portion, the number of LED elements 20 can be reduced, and the arrangement of the LED elements 20 can be made necessary and sufficient.

  In addition, in an LED exhibiting general brightness, if the interval is 30 mm or less, a uniform display unit that does not cause unevenness can be obtained, and if it exceeds 30 mm, this is not the case. On the other hand, if the distance is less than 10 mm, the number of LEDs is too large, which is disadvantageous in terms of cost and power consumption.

  Furthermore, the back plate 10 is fixed to the rear surface of the foamed synthetic resin sheet 2, and the through hole 12 is formed so as to continue to the back plate 10, and the portion of the back plate 10 in the through hole 12 is Since it is formed in a tapered shape that spreads forward, the light emission of the LED element 20 can be guided obliquely forward, and the light forward obliquely causes the display part to emit light and is also reflected by the display part to be foamed synthetic resin sheet 2 is reached, contributing to uniform light emission of the display unit.

  Furthermore, since the LED element 20 protrudes from the through-hole 12, part of the light emitted from the LED element 20 can directly reach the foamed synthetic resin sheet 2, and the reflection by the foamed synthetic resin sheet 2 can be positively performed. By utilizing this, it is possible to provide beautiful light emission of the display portion.

  In addition, since the LED element 20 is mounted on the LED substrate 4 and the foamed synthetic resin sheet 2 is fixed to the front side of the LED substrate 4, the structure of the signboard for uniform light emission is compact. Can be configured.

  In addition, other embodiment of this invention which mainly changes the said embodiment and illustrates is illustrated. The material of the foamed synthetic resin sheet, the bubble ratio, and the average diameter of the bubbles are appropriately changed in a state where a high total reflectance (approximately 95% or more) can be secured. In addition, the dimensions of the foamed synthetic resin sheet, the substrate, the back plate, etc. are changed as appropriate, such as making them different from each other or making the thickness match. Alternatively, the material and dimensions of the back plate and the display unit are appropriately changed. These shapes are changed as appropriate.

  The LED elements and the through holes are arranged at positions corresponding to the vertices of the hexagon or positions corresponding to the vertices of the parallelogram. The LED elements are installed independently, not on the substrate. The LED element has its head aligned with the front part of the through hole or installed behind the through hole. A through-hole is made into the taper shape which spreads forward including the part of a foaming synthetic resin sheet.

It is (a) internal front explanatory drawing of the signboard which concerns on embodiment of this invention, (b) LED element part cross-sectional explanatory drawing of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Signboard 2 Foamed synthetic resin sheet 4 LED board 10 Back plate 12 Through-hole 20 LED element

Claims (5)

A foamed synthetic resin sheet having a plurality of through-holes in two dimensions at predetermined intervals; and
LEDs arranged inside each through hole;
A signboard comprising a translucent plate disposed in front of a foamed synthetic resin sheet. The signboard according to claim 1, wherein the predetermined interval is 10 mm or more and 30 mm or less. While the back plate is fixed to the rear surface of the foamed synthetic resin sheet,
The through hole is formed to be continuous with the back plate,
The signboard according to claim 1 or 2, wherein at least a back plate portion of the through hole is formed in a tapered shape extending forward. The signboard according to any one of claims 1 to 3, wherein the LED protrudes from the through hole. LED is mounted on the board,
The signboard according to any one of claims 1 to 4, wherein a foamed synthetic resin sheet is fixed to the front side of the substrate.

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