JPH0537734Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a signal light used for traffic lights, alarms, signs, indicators, etc.

[Conventional technology]

Conventionally, filament light bulbs have been used exclusively as light sources for lighting devices such as railway signals, alarms, and signs.

For example, the format of signal light bulbs is F type, G type.
It is divided into two types, I-type, I-type, etc., and is used depending on the purpose of use. Filament light bulbs are classified as point light sources, and are usually combined with a stepped lens.In order to focus the lens, a special convex collar is placed on the bulb base, and the angle and mutual distance between the convex and filament are adjusted. It is strictly regulated. By placing a reflector after the light bulb, the light power can be amplified by 27 times, but when exposed to direct sunlight, the light color appears and creates an illusion, so depending on the purpose, a reflector may be used. It may not be possible to place the

[Problem that the invention attempts to solve]

By the way, when a filament light bulb is used as a light source for a signal lamp, there are problems as described below. The first problem is that the life of the filament ends in a relatively short period of time due to breakage of the filament, and its replacement and maintenance are troublesome.

For example, type G signal bulbs are used in multi-light traffic lights, and their lifespan is set at 5,000 hours, but they are usually used at 80 to 90% of the rated voltage to extend their lifespan. However, the usage period should not exceed two years, and more importantly, the bulbs of stop signal lights should be used for seven months, and when replacing stop lights, new ones should be used, followed by proceeding lights and caution lights. being done.

The second point is that power consumption is large. The G-type light bulb used in the multi-light traffic light mentioned above has a rating of 30V.
It is 40W. Power is supplied to the signal light from the signal power supply device. Signal power supplies are, in principle, uninterruptible power supplies, and as they are important equipment for train operation, their use for other purposes is strictly restricted. Therefore, reducing power consumption as much as possible is a more important issue than simple power saving. Another problem is that because it is a point light source, the efficiency of using the luminous flux is low. Therefore,
LED (light emitting diode) users are starting to pay attention to this technology. If LED is used as a signal light source,
A considerable part of the disadvantages mentioned above due to the use of light bulbs can be eliminated. However, the current LED is 1
Since the amount of light per individual is small, it is necessary to use multiple LEDs to obtain the required amount of light when using it as a signal light source.
must be incorporated.

Signal lights have been known in the past, in which LEDs are arranged vertically and horizontally on a board and incorporated into a lamp device.

However, the structure of commercially available LEDs is that the LED chip is molded with transparent resin, so the molding resin protrudes around the light-emitting element and is exposed to the substrate.
Even if LEDs are arranged densely, the number is limited,
In order to obtain the amount of light required for signal lights using current LEDs, the board must be made larger.

In addition, when mixing colors, for example, to emit amber (orange), it is necessary to use a red LED and a green LED.
The LEDs are distributed and arranged on the substrate, but if the arrangement is not dense, there is a problem that the desired color mixture cannot be obtained.

Furthermore, although LEDs generate only a small amount of heat, the overall amount of heat generated is large, and when each LED chip is individually molded in resin, there is a problem of poor heat dissipation.

An object of the present invention is to provide a signal light using LEDs in which LEDs are arranged densely on a substrate to increase the amount of light emitted within a certain area.

[Means to solve the problem]

In order to achieve the above purpose, the signal light according to the present invention includes an LED mounting board 2 and a block body 1.
The signal light has a transparent resin tank 9 and a transparent resin tank 9 in the lamp unit, and the LED mounting board 2 has many printed wirings.
This is the light emitting surface of a signal light in which LED chips C are connected and arranged on a board surface, and the block body 1 holds an LED mounting board 2 and is installed in the signal light device, and is fitted with a heat dissipation fin 4. It has a seat 5 and an inclined rising part 6, the heat radiation fin 4 is for dissipating the heat generated by the light emission of the LED chip C, and the fitting seat 5 is for fitting and holding the LED mounting board 2. The slanted rising portion 6 is a portion that is tilted upward from the outer peripheral edge of the fitting seat 5 that holds the LED mounting board 2, and the transparent resin tank 9 is a part that is tilted upward from the outer peripheral edge of the fitting seat 5 that holds the LED mounting board 2.
This is a transparent surface protective layer made by embedding chips C and filling them into the inclined rising portion 6 and hardening them.
The light emitting surface of the mounting board 2 is arranged to face the lens 14 of the lamp device 13.

[Effect]

Each LED chip arranged on the substrate is molded all at once with a transparent resin layer, and without being obstructed by the resin mold, the LED chips are arranged densely on the substrate with close spacing between them, increasing the amount of light emitted. The color increases and the light is emitted evenly even when mixed colors. Also, each
The heat generated in the LED chip is radiated to the block body through the board.

〔Example〕

An embodiment in which the signal light of the present invention is applied to a departure signal light device will be described below with reference to the drawings.

A departure signal is a signal installed on the departure line of a stop, and is used to indicate to trains departing from the stop whether or not the road ahead of the signal is open. However, the lighting equipment to which the present invention is applied is not limited to departure signals. The same applies to any type of traffic light.

As shown in FIGS. 1 and 2, the signal light of the present invention consists of a disk-shaped block body 1 and an LED mounting board 2 incorporated into the block body 1. The block body 1 is made of an aluminum material with excellent heat dissipation properties, has a through hole 3 opened in the center, and has heat dissipation fins 4 protruding from the back surface. In FIG. 3, a fitting seat 5 for the LED mounting board 2 is provided in a stepped manner on the edge of the through hole 3 opened on the front side of the block body 1, and a fitting seat 5 for the LED mounting board 2 is provided in a stepped manner from the edge of the fitting seat 5 toward the outer periphery. An upwardly sloping slanted rising portion 6 is formed. On the other hand, the LED mounting board 2 has a large number of LED chips C,
C... are connected and arranged on the board surface.

This LED mounting board 2 is fitted and held on a fitting seat 5 provided on the block body 1, and installed with the array of LED chips C attached to the board surface facing the front.
Through the small hole 7 opened on the slope of the rising part 6
Lead wire 8 connected to the wiring of LED mounting board 2
is pulled out backward, and then a transparent epoxy resin liquid is supplied onto the substrate 2, the transparent resin is received in the rising part 6, and the LED chips C on the substrate 2 are placed in the transparent resin layer 9 formed by curing. , C... are buried.
This transparent resin layer 9 serves as a surface protective layer for the LED chip C. The resin has a refractive index between that of air and a semiconductor, and has the function of reducing total reflection on the surface and increasing external quantum efficiency. have and further
It also serves as an adhesive for fixing the LED mounting board 2 to the block body 1.

In FIG. 2, a printed circuit board 12 on which electrical components 11 such as resistors and capacitors are mounted is attached to a part of the end surface of the heat dissipation fin 4 via a spacer 10, and a lead wire 8 drawn out from the LED mounting board 2 is attached. Connect to the wiring of the electrical component 11 on the printed circuit board 12.

Figure 4 shows the signal light of the present invention set in the lamp unit. In the figure, a lamp 13 has a lens 14 on the front, and a hood 15 is integrally molded in front of the upper part thereof. Attach the brackets 16 to both sides of the block body 1, house them in the lamp unit 13, align the light emitting surface of the LED mounting board 2 with the focus position of the lens 14, and then attach the brackets 16 to both sides of the block body 1.
is fixed to the lamp 13. A terminal board 17 is attached to this bracket 16, and the printed circuit board 1
The electric components 11 of 2 and the external wires drawn into the terminal board 17 are connected to connect the LED chips C, C, . . . on the board 2 to the power circuit.

When the LED chips C are energized, each chip C emits light of a unique color, which passes through the lens 14 and becomes a parallel beam of light that is irradiated to the front. The heat generated by each LED chip C is absorbed by the block body 1 and radiated into the atmosphere through the fins 4.

In this case, each of the LED chips C is a point light source, but LEDs have excellent directivity, and by arranging a large number of them on the same substrate, they can be effectively illuminated in front as a surface light source. Luminous efficiency can be increased through the transparent resin covering the surface.

[Effect of idea]

This proposal consists of multiple devices arranged on the board as described above.
Since the LED chips are coated all at once with a transparent resin layer, each LED can be closely arranged with close spacing between each other without being hindered by the resin coating. Compared to arranging LEDs on a board,
It becomes possible to assemble a large number of LED chips on a board of the same size, and as a result, it is possible to obtain the necessary amount of light as a signal light source using a relatively small board.

Furthermore, when LEDs of different colors are combined, a clear mixed color can be emitted.

Furthermore, in this proposal, each LED chip is attached to a board and each LED chip is coated all at once with a layer of transparent synthetic resin, so the heat generated by each LED chip can be radiated to the block body through the board.

In particular, in this proposal, the block body that also serves as a heat sink
Since the fitting seat of the LED mounting board and the slanted rising part are provided on its mouth edge, the inner surface of the rising part can be effectively used as a reflection surface for the light source of the LED chip and a receiving part for the transparent resin. This has the effect that the block body can be made into a unit and can be widely applied to railway signals, traffic signals, and other various types of signal lamps.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view, Fig. 3 is an enlarged sectional view showing the mounting part of the LED mounting board, and Fig. 4 is a lamp equipment equipped with the signal light of the present invention. FIG. 1...Block body, 2...LED mounting board,
3... Through hole, 4... Heat dissipation fin, 5... Fitting seat, 6... Rising part, 9... Transparent resin layer, C...
LED chip.

Claims (1)

[Claims for Utility Model Registration] A signal light having an LED mounting board 2, a block body 1, and a transparent resin layer 9 in the lamp unit.
This is the light emitting surface of a signal light in which LED chips C are connected and arranged on a board surface, and the block body 1 holds the LED mounting board 2 and is installed in the lamp unit of the signal light, and is fitted with the heat dissipation fin 4. It has a seat 5 and an inclined rising part 6, the heat dissipation fin 4 is for dissipating the heat generated by the light emission of the LED chip C, and the fitting seat 5 is for fitting and holding the LED mounting board 2. The slanted rising portion 6 is a portion that is tilted upward from the outer periphery of the fitting seat 5 holding the LED mounting board 2, and the transparent resin layer 9 is a portion that extends upward from the outer periphery of the fitting seat 5 that holds the LED mounting board 2.
This is a transparent surface protective layer made by burying chips C and filling them into the inclined rising portion 6 and hardening them.
A signal light characterized in that the light emitting surface of the mounting board 2 is arranged to face the lens 14 of the lamp device 13.