JP2002093206A - LED signal light - Google Patents

Abstract

(57) [Summary] (with correction) [Problem] In an LED signal lighting device employing an LED lamp as a light source, the power consumption of which is increased due to an increase in power consumption, the heat generated due to the miniaturization of a substrate is dispersed in heat conduction. Heat can be dissipated in the absence of heat. SOLUTION: A substrate 3 holding an LED lamp is formed as a self-standing structure by a metal plate having a sufficient thickness to conduct heat generated at the time of lighting, and the substrate 3 in a state where the LED lamp 2 is mounted is insulated. The substrate 3 and the insulating heat conductive sheet 5 are placed on the heat radiation fins 4 via the conductive heat conductive sheet 5,
L, which is configured so as to be pressed and held to the radiation fins by a resin pressure plate 6 which also functions as a reflecting mirror.
ED signal light 1 was used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal light used in a transportation system such as a railway signal and a road traffic signal, and more particularly to a signal light adopting an LED lamp as a light source. is there.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a configuration of an LED signal lamp 90 employing a conventional LED lamp as a light source. For example, a required number of LED signal lamps 90 are provided on a substrate 92 on which a power supply pattern is formed by a printed wiring board. Equipped with LED lamp 91,
This substrate 92 was housed in a lamp body composed of a lens 93 and a housing 94.

At this time, in the conventional LED lamp 91, the power consumption (for example, 0.1 W) per lamp is small, and accordingly, the light amount is small.
In order to secure the light quantity required for the signal lamp 90, a large number (for example, 200) of LED lamps 91 are required, whereby the substrate 92 has substantially the same area as the lens 93. .

[0004]

However, in recent years, it has become possible to increase the power (for example, 0.5 W) per LED lamp 91 and to use the LED lamp 91 per lamp. Number reduction (eg 2
0) is possible, and an effect such as cost reduction by reducing the number of assembly steps can be expected.

In this case, if the above-described LED lamp 91 having a large power is used, the area of the substrate 92 can be naturally reduced. On the other hand, heat is concentrated on a small area. In the conventional configuration, the heat cannot be dissipated, and the LED lamp 91 having a large power cannot be used. Therefore, there is a problem that the cost cannot be reduced by reducing the number of steps.

[0006] In addition, how to use one LED lamp 9
Although 1 is a small electric power, the total number of heats to be used is enormous since the number of used electric power is enormous, so that the temperature rise in the lamp 90 is high. In order to solve this problem, there is a type in which a heat radiating fin 95 is attached to the back surface of the housing 94. In this case, the heat generated in the LED lamp 91 is directly radiated due to the interposition of a resin substrate 92 or the like. Therefore, such effects cannot be expected, and for example, there is a concern that the life of the LED lamp 91 is shortened.

[0007]

The present invention provides a plurality of LEs as specific means for solving the above-mentioned conventional problems.
In an LED signal lighting device employing a D lamp as a light source, a substrate holding the LED lamp is formed as a self-standing structure with a metal plate having a thickness sufficient to conduct heat generated at least when the LED lamp is turned on, The substrate with the LED lamp mounted thereon is placed on a radiating fin via an insulating heat conductive sheet, and the substrate and the insulating heat conductive sheet are made of resin having a configuration also serving as a reflector. An object of the present invention is to solve the problem by providing an LED signal light characterized in that a pressure plate is attached to the radiation fin by being pressed and held by a pressure plate.

[0008]

Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 and FIG.
An LED signal lamp according to the present invention is indicated by a symbol. This LED signal lamp 1 employs a plurality of LED lamps 2 as a light source, which is the same as the conventional example.

Here, the LED signal lamp 1 of the present invention employs the LED lamp 2 having higher power consumption than that of the conventional example, whereby the number of the LED lamps 2 used is, for example, 100. The number is greatly reduced to 20 units, and accordingly, the productivity can be improved by reducing the number of assembling steps.

In this case, as described in the conventional example, L
With the decrease in the number of ED lamps 2 used, the size of the substrate 3 has been reduced. Naturally, the heat generated when the LED lamps 2 are turned on is concentrated on a small area, which necessitates cooling of the LED lamps 2. However, according to the present invention, it is possible to perform necessary and sufficient cooling on the LED lamp 2 by employing the configuration described below.

FIG. 2 shows the structure of the main part of the present invention in a simplified manner such as by reducing the number of LED lamps 2 in order to avoid complicating the drawing. The substrate 3 for supplying power to the LED and holding the LED at a predetermined position is formed of a metal plate having a thickness sufficient to conduct heat generated when the LED lamp 2 is turned on.

At this time, the substrate 3 is not formed by bonding a copper foil on a resin plate as in the case of the conventional substrate, but is formed by pressing or etching the metal plate itself. The substrate is cut out into a desired shape to form a substrate 3. The terminals of the LED lamps 2 are fixed to the substrate 3 by appropriate means such as caulking, riveting, spot welding, etc., to supply and hold power. is there.

In order to fulfill the above functions, it is desirable that the substrate 3 is self-supporting while maintaining a predetermined shape. However, the function of the substrate 3 is to transmit a positive potential and a negative potential to the LED lamp 2. Therefore, at least two sheets must be formed. Therefore, the portion on the positive potential side and the portion on the negative potential side are connected in a bridge at an appropriate position to form a single piece, and when the LED lamp 2 is mounted, the bridge-like portion is cut off. Is also good.

The substrate 3 on which the LED lamps 2 are mounted as described above is further mounted on the radiating fins 4 to radiate heat. The radiating fins 4 are formed of a metal member having excellent thermal conductivity such as aluminum. Therefore, if the substrate 3 and the radiation fins 4 are directly attached, a short circuit occurs.

Therefore, the insulating heat conductive sheet 5 is sandwiched between the substrate 3 and the heat radiation fins 4 to prevent the above-mentioned short circuit.
In such a configuration, the heat conduction efficiency is greatly affected by the adhesion between the insulating heat conductive sheet 5 and the substrate 3 and the radiating fins 4. Becomes In the present invention, as the insulating heat conductive sheet 5, a sheet having a base material of boron nitride and silicon rubber is employed.

Therefore, in the present invention, as a means for solving the above, a pressure plate 6 is prepared, and the pressure plate 6 is formed of an insulating resin, and a portion corresponding to the LED lamp 2 is substantially provided. A mortar-shaped opening 6a is provided, and can directly contact the substrate 3 without touching the LED lamp 2.

At the same time, a reflective film 6b is formed on the surface of the LED lamp 2 on the light emitting direction side by vacuum evaporation of aluminum or the like, and the opening 6a is
It functions as a reflecting mirror that reflects the light radiated laterally from the D lamp 2 toward the irradiation direction.

In addition, the pressure plate 6 is provided with a mounting hole 6c.
Is configured to be screwed into the device. The substrate 3 does not come into contact with the screw 7 when the pressure plate 6 is screwed to the radiation fin 4. Further, the pressure plate 6 is provided with a boss 6 d for positioning the substrate 3, the radiation fins 4, and the insulating heat conductive sheet 5.

By doing so, in the LED signal lamp 1 of the present invention, when the substrate 3 is attached to the radiating fin 4 via the insulating heat conductive sheet 5, the radiating fin 4 and the pressure plate 6 are attached. Is performed with the substrate 3 and the insulating heat conductive sheet 5 interposed therebetween.

At this time, the substrate 3 and the insulating heat conductive sheet 5 are combined with the radiation fins 4 and the pressure plate 6.
Is dependent on the tightening strength of the screw 7. Therefore, if the tightening strength of the screw 7 is controlled as a constant torque or more by a torque driver or the like, the pressure at which the insulating heat conductive sheet 5 is sandwiched between the substrate 3 and the radiation fins 4 is maintained at a value equal to or more than a certain value. That is, the intended thermal conductivity is ensured.

In FIG. 1, reference numeral 8 denotes a yellow LE.
The housing which is a part of the D signal lamp is shown, the one denoted by reference numeral 9 is a similar outer lens, and the one denoted by reference numeral 10 is an inner lens, but is not a part directly involved in the present invention. Therefore, detailed description here is omitted.

[0022]

As described above, according to the present invention, L
The substrate holding the ED lamp is formed of a metal plate having a thickness sufficient to at least conduct heat generated when the LED lamp is turned on, and has a self-standing structure. A configuration in which the substrate and the insulating heat conductive sheet are placed on the heat radiating fin via a heat conductive sheet, and the substrate and the insulating heat conductive sheet are pressed and sandwiched between the heat radiating fins with a resin pressure plate configured to also serve as a reflecting mirror. When using LED lamps with high power and increased heat generation per unit as the light source, the heat generated due to the downsizing of the board is radiated without unevenness in heat conduction Possible,
By reducing the number of LED lamps used, the number of parts and the number of assembly steps can be reduced, and this type of LED signal lamp has extremely excellent effects on productivity and cost reduction.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an LED signal lamp according to the present invention.

FIG. 2 is a perspective view showing a main part of the same embodiment in a partially exploded state.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... LED signal lamp 2 ... LED lamp 3 ... Substrate 4 ... Heat radiating fin 5 ... Insulating heat conductive sheet 6 ... Pressure plate 6a ... Opening 6b ... Reflection film 6c ... Mounting hole 6d ... … Boss 7 …… Screw

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01L 33/00 G08G 1/095 M 5H180 // B61L 5/12 F21Y 101: 02 G08G 1/095 F21Q 3 / 00Z F21Y 101: 02 F21S 1/02 G (72) Inventor Masahiro Akimoto 2-9-13 Nakameguro, Meguro-ku, Tokyo F-term within Stanley Electric Co., Ltd. 3K014 AA01 LA01 LB04 3K080 AA07 AA12 BA07 BE07 5C094 AA35 BA25 CA19 5F041 AA33 DB01 DC07 DC12 DC22 DC55 DC81 FF16 5G435 AA12 BB04 EE05 EE13 EE33 FF03 GG44 5H180 HH14

Claims (1)

[Claims] 1. An LED signal lamp employing a plurality of LED lamps as a light source, wherein a substrate holding the LED lamps is a metal plate having a thickness sufficient to conduct heat generated when the LED lamps are turned on. The substrate, which is formed as a self-supporting structure and has the LED lamp mounted thereon, is placed on a radiating fin via an insulating heat conductive sheet, and the substrate and the insulating heat conductive sheet are connected to a reflecting mirror. An LED signal light fixture comprising a resin pressure plate that also serves as a pressure plate and is attached to the radiation fins by pressure.