JPS58114474A - Display device - Google Patents

Abstract

PURPOSE:To obtain a display device having low resistance and low heating quantity by energizing an LED through 3-terminal SCR and a resistor, switching the firing conduction angle of the SCR, thereby simplifying the regulation of the power source voltage, and containing circuit component parts in a mouth piece with interchangeability being provided. CONSTITUTION:LEDs 14-16 are inserted in series through a series circuit of a resistor 12 and a unidirectional 3-terminal SCR13 with an AC power source 11. A series circuit of a conducting angle control circuit 18, a resistor 19 and a capacitor 20 is connected in parallel with the SCR13. Resistors 22, 23 are switched by a switch 21 of the circuit 18 to connect in series with a resistor 24 and a capacitor 25, the connecting point of the resistor 24 and the capacitor 25 is connected to the gate of the SCR13 with a series circuit of a diode 26 and a constant-voltage conductive element 27, and a resistor 28 is connected between the gate and the cathode. A body is contained in a mouth piece 29 which is interchangeable with a bulb, the lever 30 of the switch 21 is sidewisely projected, and the LEDs are sealed in a transparent unit 32 and are integrated with the mouth piece. According to this configuration, even if the power source voltages are different, a display device which can be used by a simple lever operation can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a display device in which a light emitting diode is used as a light emitting source and the light emitting diode is housed in a light-transmitting body.
It is used for company) boards, vending machines, etc.

[Technical background of the invention and its problems]

For example, display devices such as control panels and vending machines use low-cost light bulbs or light-emitting diodes as light sources, but devices that use light bulbs have the drawbacks of high power consumption and short lifespans. However, light bulbs using light emitting diodes can compensate for the drawbacks of light bulbs mentioned above.

Conventional display devices of this type have a configuration in which, for example, a pin terminal is provided on the display device and the pin terminal is inserted into a jack terminal, so it is not compatible with light bulbs and cannot be used in place of light bulbs. Ta. In addition, conventional display devices using light emitting diodes are 1, for example, as shown in FIG.
: A series circuit of a plurality of light emitting diodes 4.4... is connected to the AC power supply I through a diode 2 and a resistor 3 in series, and the diodes 2.4... are connected in series. Resistor 3 and light emitting diode 4.4
... was stored in case 5. However, with such a device, the power supply voltage applied to the circuit cannot be adjusted, so as the power supply voltage increases, the capacitance of the resistor 3 must be increased. There was a drawback that it was difficult to store it.

[Purpose of the invention]

This invention was made to eliminate these drawbacks, and it is compatible with light bulbs in devices that use light emitting diodes as light sources, and even when the power supply voltage is high, it is possible to reduce the resistance of the resistors used. It is an object of the present invention to provide a display device whose size and heat generation can be kept small.

Another object of the present invention is to provide a display device that can be used by simple adjustment operations even when the power supply voltages are different.

[Summary of the invention]

In this invention, a light emitting diode is connected in series (via a resistor and a three-terminal thyristor) to a power source.

The thyristor is controlled to fire at a predetermined conduction angle by a conduction angle control circuit (2). It is constructed by integrating the body and the cap.

In addition, this invention has a conduction angle control circuit in which the ignition conduction angle can be selected from several types using a changeover switch, and the main body of the changeover switch is housed in the base, and the operating part is freely movable to the side of the base. Two things stand out.

[Embodiments of the invention]

2 and 3 show an embodiment of the present invention, in which AC power source 1 = resistor Z2 and unidirectional three-terminal thyristor 1
3 in series (=for example, 4 light emitting diodes 14,
15, 16, and 17 series circuits are connected. A conduction angle control circuit 18 (= series circuit of a resistor 19 and a capacitor 20) is connected in parallel to the thyristor 13.The conduction angle control circuit z8 is a two-contact changeover switch 21
It has a parallel circuit of a series circuit of one contact 211 of the switch 2I and a resistor 22, a series circuit of the other contact 212 of the changeover switch 2I and a resistor 23, and a series circuit of a resistor 24 and a capacitor 25.

The connection point between the resistor 24 and the capacitor f25 of the series circuit is connected to the dart of the thyristor are connected.

and the resistor 12. f Iristor X3% conduction angle control circuit Z8, resistor 19. Condenser f-20 and switching switch 7j
The main body of the Z is housed in a cap 29 to make it compatible with a light bulb, and the operating lever 30 of the changeover switch 21 is inserted through a long hole 3I drilled on the side of the cap 29 along the same direction. It protrudes outward and is movable. The light-emitting diodes II, Is, and 16° I2 are molded in a light-transmitting body 32 made of a light-transmitting resin, and the light-transmitting body 3
2 is integrated with the cap 29.

In the embodiment of the present invention having such a configuration, the base 29 is used as a housing portion for each circuit component, so that it is compatible with a light bulb and can be easily replaced with a light bulb. In addition, each of the light emitting diodes z4 to I7 is molded with a translucent resin, so it is strong against vibrations, and even if the light emitting brightness of each light emitting diode is different, the light from each light emitting diode is scattered by the resin. The luminance of the light emitted from the transparent body 32 is averaged, and a good 1 display can be achieved.

Further, since the thyristor I3 is fired at a predetermined conduction angle by the conduction angle control circuit z8, the power supply voltage applied to the circuit can be set to be lower than the power supply voltage of the AC power supply 11 according to the firing conduction angle. As the resistor 12, one contact 211, which is small and generates heat, is turned on and used,
If you turn on the other contact 212 of the changeover switch 2 when the AC power supply is 1z, the voltage will be 100V, 2
It can be used with either 00V power source (2) by simple adjustment by simply switching the operating lever 30.

In this case, when the other contact 212 of the changeover switch 21 is turned ON and a 200V power supply is used, the firing conduction angle for the thyristor 13 of the conduction angle control circuit 18 is set by 100
If the voltage is set to be approximately the same as -C2 as the power supply voltage applied to the circuit when a V power supply is used, there is no need to increase the capacitance of the resistor 12 even if 200V power supply is ≦2.

FIG. 4 shows another embodiment of the invention.

This is a series circuit of light emitting diodes 14 to 17 and light emitting diodes 11' and I5' through an AC power supply 11, a resistor X2 and a bidirectional three-terminal thyristor z3 connected in series.
, I 6' , 1 F' are connected to an anti-parallel circuit of the series circuit. In addition, the conduction angle control circuit I8 is configured by omitting the changeover switch 2Z and the diode 26, and by connecting the resistor 34 in series with the resistor 24, and other parts are the same as in the previous embodiment.

In this case, the switch can be changed for different power supply voltages! Although it cannot be used more than the other,
In other respects, the same effects as in the embodiment described above can be obtained.

In the above embodiments, a molded transparent resin was used as the transparent body, but the present invention is not limited to this, and a container-shaped body may be used.

〔Effect of the invention〕

As described above, according to the present invention, the device C2 uses a light emitting diode as a light source, and since the circuit components are housed in the base, it is compatible with a light bulb.

In addition, since the light emitting diode is energized via a resistor and a three-terminal iris resistor, and the thyristor is controlled to fire at a predetermined conduction angle, it is possible to lower the power supply voltage and apply it to circuit C2. Therefore, it is possible to provide a display device that can suppress the resistance and the amount of heat generated, and can be used even with a power source with a high power supply voltage.

Furthermore, according to the present invention, the firing conduction angle of the thyristor is changed by a changeover switch so that the circuit conditions are almost the same even if the power supply voltage is different, so even if the power supply voltage is different, the adjustment operation is easy. It is possible to provide a display device that can be used by

[Brief Description of the Drawings] Fig. 1 is a circuit diagram showing a conventional example, Fig. 2 is a circuit diagram showing an embodiment of the present invention, Fig. 3 is an external view of the embodiment, and Fig. 4 is a circuit diagram of the invention. FIG. 3 is a circuit diagram showing another embodiment of the present invention. II... AC power supply, 12... Resistor, Z3. Z, 9'
... 3-terminal thyristor, 14-z7... Light emitting diode, 1B... Continuity angle control circuit, 2Z... Changeover switch, 29... Base, jo... Operation lever, 32...
・Translucent body. Applicant's representative Patent attorney Takehiko Suzue 1, Display of the case Patent Application No. 1983-215384 2, Name display device of the invention 3, Person making the amendment Relationship with the case Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4. Engrave the agent statement (change the contents)

Claims (1)

[Scope of Claims] (1) A light emitting diode connected to a power source through a three-terminal thyristor and a resistor in series, and a conduction angle control circuit connected to the power source and igniting the thyristor at a predetermined conduction angle;
A display device comprising: a base housing the conduction angle control circuit and the thyristor; and a transparent body integrated with the base housing the light emitting diode. (2; The display device according to claim 1, characterized in that the transparent body is made of resin, and a light emitting diode is molded and housed in the resin. (3) A three-terminal thyristor and a resistor are provided as a power source. A light emitting diode connected in series, a conduction angle control circuit connected to the power source and igniting the thyristor at various selected conduction angles, a base housing the conduction angle control circuit and the thyristor, and the base. a transparent body that is integrated with the light emitting diode and houses the light emitting diode, and a main body that is housed in the base;
°= Temple ÷ The operation part is movably protruded to the side of the cap,
A display device comprising a changeover switch for selecting an ignition conduction angle of the conduction angle control circuit.