JP2006276268A - Led display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that sufficient cleaning of the surface of a LED can not be performed because an eaves-like member interferes since the eaves-like member is formed on the front surface by projecting long in the conventional LED display unit. <P>SOLUTION: In the LED display unit, a printed circuit board 2 on which LEDs 3 are arranged like a matrix is attached to a casing 1, a hole 51 into which a middle part of the LEDs is inserted at a contact state is formed on the front surface side of the printed circuit board and a light shielding member in which louvers 53 are formed along columns of the LEDs is arranged, a transparent board 6 is attached to a peripheral wall of the light shielding member at a watertight state at a state that the LEDs projecting on the side of the light shielding member are covered. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an LED display unit of a display device that is installed outdoors and displays information by turning on a light emitting diode (hereinafter referred to as LED) as a light source, in particular, exhaust gas of a car such as a tunnel or dust scattered during traveling. The present invention relates to an LED display unit that is suitable for being installed in a place that is easily soiled due to the like.

  As a conventional display unit of a display device using LEDs for displaying road information and the like, there is an invention disclosed in Japanese Patent Laid-Open No. 8-320657. The present invention solders an LED to a printed wiring board, inserts the LED into an insertion hole of a heat dissipation member, fills and fixes silicon resin in a gap between the insertion hole and the LED, and attaches the heat dissipation member to the printed wiring board. Further, a light shielding member is screwed and fixed on the heat radiating member in a state where the LED is inserted.

And it is comprised so that the rainwater etc. from the front surface (surface side of LED) may not penetrate | invade into the printed wiring board side by making the space between the said insertion hole of a heat radiating member and LED into a watertight state. Since the display unit configured in this manner is attached to the casing in a watertight manner between the heat radiating member, rainwater or the like does not enter the casing.
JP-A-8-320657

  In the display device configured as described above, even if it is installed outdoors, it does not cause a failure due to intrusion of rainwater or the like, and it is installed on the road and has some cleaning effect on the LED by rainwater. The degradation of visibility due to is relatively small. However, when installed in a tunnel, in particular, dirt due to exhaust gas or the like tends to adhere to the LED surface, and it is necessary to perform more cleaning than outdoors in order to ensure visibility.

  However, the conventional display unit has a problem that since the bowl-shaped member protrudes long on the front surface, the bowl-shaped member obstructs and the surface of the LED cannot be sufficiently cleaned. .

  The present invention is intended to solve the above-described problems, and its object is to attach a transparent plate in a watertight state to a light shielding member in each display unit so that the surface of the LED is not contaminated. It is an object to provide an LED display unit that can be easily cleaned because only the front surface of the plate becomes dirty.

  The LED display device according to the present invention achieves the above-described object, and the means of claim 1 is such that a printed circuit board on which LEDs are arranged in a matrix is attached to a housing, and the printed circuit board is provided with the printed circuit board on the front side. A unit in which a light-shielding member in which a hole to be inserted in a state where the middle portion of the LED is in contact is formed and a louver is formed along the LED row is disposed, covers the LED protruding toward the light-shielding member. In this state, a transparent plate is attached in a watertight state on the outer peripheral wall of the light shielding member.

  According to a second aspect of the present invention, there is provided a printed circuit board in which LEDs are arranged in a matrix with respect to a housing, and an intermediate member in which an insertion hole for inserting and fixing the body of each LED is formed on the front surface of the printed circuit board. A light-shielding member disposed on the front surface of the intermediate member and having a hole in which the intermediate portion of the LED is inserted in a contact state and having a louver formed along the LED row; and the LED exposed from the intermediate member And a transparent plate attached in a watertight manner to the outer peripheral wall of the light shielding member in a state of covering the light shielding member.

  According to a third aspect of the present invention, there is formed a printed circuit board in which LEDs are arranged in a matrix with respect to the housing, and a hole that is disposed on the front surface of the printed circuit board and into which an intermediate portion of the LED is inserted in contact It is characterized by comprising a light shielding member in which louvers are formed along the LED rows, and a transparent plate attached in a watertight manner to an extension wall extending from the housing to the outer periphery of the light shielding member.

  According to a fourth aspect of the present invention, in the first aspect, the intermediate member is formed of a material having a high thermal conductivity, and the fifth aspect includes the intermediate member according to the second aspect. The light-shielding member is formed of a material having high thermal conductivity, and the means of claim 6 is characterized in that in any one of the above-described claims 1 to 3, heat is generated in a gap between the printed circuit board and the LED. It is characterized by being filled with a highly conductive resin.

  As described above, in the LED display unit of the present invention, a printed board on which LEDs are arranged in a matrix is attached to a housing, and a hole through which the intermediate portion of the LED is inserted in a contact state is formed on the front side of the printed board. In a unit in which a light-shielding member formed and having a louver formed along a row of LEDs is disposed, a transparent plate is attached in a watertight state on the outer peripheral surface of the light-shielding member in a state of covering the LED exposed from the light-shielding member Therefore, the surface of each unit becomes flat and cleaning can be performed very easily.

  Further, an intermediate member in which an insertion hole in which the body of each LED is inserted and fixed is interposed on the front surface of the printed circuit board, so that a gap between the hole of the intermediate member and the LED does not occur. Even if water enters from the gap with the light shielding means, the water does not enter the printed circuit board side, and electrical inconvenience does not occur.

  Further, the light shielding member is disposed in the extension piece extended from the outer periphery of the housing, and the transparent plate is attached to the extension piece in a watertight state, so that water can be prevented from entering the interior, and the electrical Inconvenience can be prevented.

  In addition, since the intermediate member is formed of a material having high thermal conductivity, heat generated in the LED is radiated through the intermediate member, so that it is possible to prevent a decrease in light emission efficiency of the LED due to an increase in heat. By forming the member with a material having a high thermal conductivity, the heat dissipation of heat can be further improved and the light emission efficiency of the LED can be prevented from being lowered, and a resin having a high thermal conductivity is provided in the gap between the printed circuit board and the LED. By filling, the heat generated in the LED can be dissipated, and there is an effect that water does not enter the circuit portion and an electrical problem does not occur.

  The present invention is an LED display unit in which a transparent plate is attached in a watertight state on the outer peripheral surface of a light shielding member in a state where an LED exposed from the light shielding member is covered.

Hereinafter, a first embodiment of the LED display unit of the present invention will be described with reference to FIGS.
In FIG. 1, A is a metal case fixed to the inner wall of the tunnel, B is an LED display unit of the present invention (hereinafter simply referred to as a unit) fitted in a mounting hole A1 formed in the case A in a watertight state and screwed. In the figure, 15 units B are attached in the vertical row and 3 units B are attached in the horizontal row.

  Next, the details of the LED display unit B of the present invention will be described with reference to FIGS. Thus, two O-rings 13 are fitted into the overlapping portion 12 with the case A, and the space between the case A and the overlapping portion 12 is kept in a watertight state when screwed. Further, a boss 12 a for fixing a printed circuit board 2 to be described later to the housing 1 is integrally formed on the inner surface from the overlapping portion 12. Further, a stepped portion 14a is formed on the inner surface of the outer peripheral portion 14 that protrudes from the case A to the front surface.

  Reference numeral 2 denotes a printed circuit board in which 16 × 16 or 32 × 32 single-color or multi-color LEDs 3 are soldered and fixed in a matrix, and is supported by the step portion 14a of the outer peripheral portion 14 of the housing 1. It is stored and fixed to the boss 12a with screws.

  Reference numeral 4 denotes an intermediate member made of a material having high thermal conductivity such as aluminum, and insertion holes 41 corresponding to the number of the LEDs 3 are formed in a matrix. In addition, the inner diameter of the insertion hole 41 is formed larger than the outer diameter of the LED 3, and has a rectangular shape as a whole. Further, nuts 42 are embedded in several places where the insertion hole 41 is not formed.

  Reference numeral 5 denotes a light-shielding member made of a material having high thermal conductivity such as aluminum, and holes 51 into which the LEDs 3 are inserted are formed in a matrix like the intermediate member. Since the inner diameter of the hole 51 is substantially the same as the outer diameter of the LED 3, the LED 3 comes into contact with the hole 51 when the LED 3 is inserted into the hole 51. Note that the light shielding member 5 is painted with a low reflectance such as black, for example, so that the contrast of display is not reduced by reflecting external light.

  The light shielding member 5 is formed in a quadrangular shape, and includes an outer peripheral wall 52 that surrounds the periphery, and a louver 53 that is integrally formed with the outer peripheral wall 52 along the row of the LEDs 3, and the outer peripheral wall 52 is The louver 53 has a height higher than that of the louver 53, and a tapered surface 52a is formed at the tip. A cylindrical portion 54 having the same diameter as the hole 51 is integrally formed on the back side. Further, a cylindrical portion 55 through which a screw is inserted is formed at a portion that coincides with the nut 42 when the light shielding member 5 is overlaid on the intermediate member 4.

  Reference numeral 6 denotes a transparent plate made of glass or transparent resin (for example, acrylic resin), and the periphery is formed on a tapered surface 61 that coincides with the tapered surface 52 a of the light shielding member 5. In addition, when the transparent plate 6 is a synthetic resin, it is desirable to perform an abrasion-resistant coating for making it difficult to damage the surface.

  Next, a method for assembling each of the above-described members will be described. As shown in FIG. 3, a printed circuit board 2 on which an LED 3 and a circuit for blinking the LED 3 are mounted is inserted into the housing 2 to form a stepped portion. Screwed and fixed to the boss 12a from the printed board side at the position abutted at 14a. Next, the insertion hole 41 of the intermediate member 4 is inserted into the LED 3 from the front side of the printed circuit board 2.

  In this state, the waterproof resin 7 such as a silicone resin having thermal conductivity and water resistance is emphasized in the gap between the insertion hole 41 of the intermediate member 4 and the LED 3 and the gap between the LED 3 and the printed circuit board 2, and water during cleaning is used. Even if it flows from the front side of the intermediate member 4, it does not enter the printed circuit board 2, so that inconveniences such as electrical shorts do not occur.

  Next, when the LED 3 is inserted through the hole 51 of the light shielding member 5 from the front surface of the intermediate member 4, the cylindrical portion 54 enters the waterproof resin 7 filled in the gap between the intermediate member 4 and the LED 3. Accordingly, there is a gap between the outer periphery of the intermediate member 4 and the outer periphery of the light shielding member 5, and water does not enter the waterproof resin 7 from the gap.

  After the light shielding member 5 is temporarily fixed to the intermediate member 4 in this way, the transparent plate 6 is bonded by the adhesive 62 that also serves as a waterproof while matching the tapered surface 61 of the transparent plate 6 with the tapered surface 53a of the light shielding member 5. In addition to fixing, the screw 8 is inserted through the hole 63 formed in the transparent plate 6 and screwed into the nut 42 of the intermediate member 4 through the cylindrical portion 55 of the light shielding member 5 to tighten the transparent plate 6 and the light shielding member 5. It is completed by fixing to the intermediate member 4. The transparent plate 6 may be fixed directly by packing or the like by providing a notch groove on the inner side of the distal end portion of the outer peripheral wall 52 without being screwed to the intermediate member 4.

  In the LED display unit B of the first embodiment configured as described above, the front surface of each unit is covered with the transparent plate 6, so that the oil and fat from the exhaust gas and the like do not adhere to the surface of the LED 3, When cleaning dirt, it can be done by cleaning the front surface of the flat transparent plate 6, so that the display device can be cleaned in a short time without the trouble of cleaning individual LEDs as in the prior art. .

  Further, the unit B and the case A are in a watertight state, and water does not enter from the intermediate member 4 to the printed circuit board 2 side, so that no electrical inconvenience occurs, and there is no intermediate problem. Since water does not enter the light shielding member 5 side through the gap between the member and the light shielding member 5, the visibility of information by the LED 3 is not deteriorated.

Next, a second embodiment will be described with reference to FIGS. Note that the same reference numerals as those in the first embodiment denote the same members, and a description thereof will be omitted.
In this embodiment, the outer peripheral portion 14 of the housing 1 is extended toward the front surface to form an extension wall 15, and the light shielding member 5 is composed only of the louvers 53 and has a length from the back surface of the transparent plate 6. The length reaches the printed circuit board 2. The light shielding member 5 is not formed with the cylindrical portion 54 and does not have the intermediate member 4.

  Next, the assembly method of the second embodiment will be described. As in the first embodiment, the printed circuit board 2 to which the LED 3 is soldered is supported by the step portion 14a and screwed by the boss 12. Fix it. Next, a waterproof resin 7 having high thermal conductivity and water resistance such as silicon resin is filled between the printed circuit board 2 and the LED 3, and before the resin 7 is cured, the light shielding member 5 is inserted into the hole of the light shielding member 5. By inserting the LED 3 into the 51 while being inserted, each LED 3 enters the hole 51 independently.

  In this state, the transparent plate 6 is bonded and fixed by an adhesive 62 that also serves as a waterproof while aligning the tapered surface 52a of the transparent plate 6 with the tapered surface 52a of the light shielding member 5, and screws 8 from the holes 63 formed in the transparent plate 6. Is passed through the printed board 2 through the cylindrical portion 55 of the light shielding member 5 and screwed into the nut 9 on the back surface side, and the transparent plate 6 and the light shielding member 5 are fixed to the printed board 2. The transparent plate 6 may be directly fixed to the distal end portion of the extension wall 15 as described above.

  In the LED display unit B of the first embodiment configured as described above, the LED 3 and the printed board 2 are surrounded by the extension wall 15 of the housing 1 and the transparent plate 6, so that water during cleaning enters inside. There is no electrical inconvenience due to the ingress of water. Further, since the structure is simpler than the first embodiment, it can be manufactured at a low cost.

  The LED display unit of the present invention is particularly suitable for installation in a tunnel. However, even when installed outdoors, there is no electrical inconvenience due to rainwater, and cleaning can be performed easily. . In addition, especially outdoors, titanium oxide may be applied to a transparent plate so that the surface is automatically washed with sunlight and rainwater.

It is a front view which shows the state which attached the LED display unit which concerns on this invention to the case. It is sectional drawing of a 1st Example. It is sectional drawing which decomposed | disassembled the LED display unit. It is an expanded sectional view of an assembly state. It is sectional drawing which shows a fixed part same as the above. It is an expanded sectional view of the 2nd example. It is sectional drawing which shows a fixed part same as the above.

Explanation of symbols

1 Case 2 Housing 3 LED
4 Intermediate member 5 Shading member 51 Hole 52 Outer peripheral wall 53 Louver 6 Transparent plate

Claims (6)

A printed circuit board in which LEDs are arranged in a matrix is attached to the housing, and a hole is formed on the front side of the printed circuit board so that an intermediate portion of the LED is inserted in a contact state, and a louver is formed along the row of LEDs. An LED display unit comprising a formed light-shielding member, wherein a transparent plate is attached in a watertight state on an outer peripheral wall of the light-shielding member in a state of covering the LED protruding toward the light-shielding member. . A printed circuit board in which LEDs are arranged in a matrix with respect to the housing, an intermediate member in which an insertion hole for inserting and fixing the body of each LED is formed on the front surface of the printed circuit board, and a front surface of the intermediate member A light-shielding member that is arranged and has a hole that is inserted in a state in which the intermediate portion of the LED is in contact with the light-shielding member and a louver formed along the LED row, and the light-shielding member in a state that covers the LED exposed from the intermediate member An LED display unit comprising a transparent plate attached to an outer peripheral wall of a member in a watertight state. A printed circuit board in which LEDs are arranged in a matrix with respect to the housing, and a hole that is disposed on the front surface of the printed circuit board and in which an intermediate portion of the LED is inserted in a contact state are formed, and a louver along the LED row An LED display unit comprising: a light shielding member formed with a transparent plate attached in a watertight manner to an extension wall extending from the housing to the outer periphery of the light shielding member. The LED display unit according to claim 2, wherein the intermediate member is made of a material having high thermal conductivity. The LED display unit according to claim 2, wherein the light shielding member is made of a material having high thermal conductivity. 4. The LED display unit according to claim 1, wherein a gap between the printed board and the LED is filled with a resin having high thermal conductivity.

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