JPH0686188U - Light emitting device - Google Patents

Abstract

(57) [Summary] [Object] To provide a light emitting device capable of emitting arbitrary light. [Configuration] A red light emitting diode element DR which emits red light and whose light emission luminance changes according to the amount of current flowing, a blue light emitting diode element DB which emits blue light and whose light emission luminance changes according to the amount of current flowing, and a green light emitting diode In addition, the green light emitting diode element DG whose light emission luminance changes according to the amount of current to be energized is surrounded by a light transmissive housing formed of a transparent resin or the like. By independently adjusting each of the variable voltage sources V1, V2, V3, the emission brightness of each of the light emitting diode elements DR, DB, DG is adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light emitting device used for color display of various manufacturing facilities such as assembly inspection and electric appliances.

[0002]

[Prior art]

 Conventionally, as a light emitting device used for optical display of various manufacturing equipment such as assembly inspection and electric appliances, a red light emitting diode element that emits red light and a green light emitting diode element that emits green light are combined to produce red or A light emitting device that emits light of either green or orange is known. In recent years, blue light emitting diode devices have also been developed.

[0003]

[Problems to be solved by the device]

 However, since the conventional light emitting device can emit light of at most three kinds of colors, there is a limit to output various information by the light emitting device.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a light emitting device capable of emitting arbitrary light.

[0005]

[Means for Solving the Problems]

 The present invention made to solve the above problems is a red light-emitting element which emits red light and whose emission brightness changes depending on the amount of current applied, and a blue light-emitting element which emits blue light and whose emission brightness changes depending on the amount of current applied. What is claimed is: 1. A light-emitting device comprising a light-emitting element and a green light-emitting element that emits green light and whose emission luminance changes depending on the amount of current that is passed through it, in a single light-transmissive casing, wherein the red light-emitting element is used. The first current variable control circuit is connected to the terminal drawn from the second current variable control circuit, the second current variable control circuit is connected to the terminal drawn from the blue light emitting element, and the first current variable control circuit is connected to the terminal drawn from the green light emitting element. It is characterized in that the variable current control circuit 3 is connected.

[0006]

[Action]

 In the present invention, the color of light emitted from each light emitting element is mixed, and each variable current control circuit independently controls the amount of current flowing through each light emitting element to adjust the light emission brightness of each light emitting element. Therefore, it can emit any color.

[0007]

【Example】

 The present invention will be described below with reference to the drawings showing an embodiment thereof.

FIG. 1 is a circuit diagram showing an embodiment of a light emitting device and a driving circuit thereof according to the present invention.

In FIG. 1, reference numeral 1 denotes a light-emitting device, which emits red light and whose emission brightness changes depending on the amount of current that flows, and red light emitting diode element DR that emits blue light and changes its emission brightness depending on the amount of current that flows. The blue light emitting diode element DB and the green light emitting diode element DG which emits green light and whose light emission luminance changes according to the amount of current passed are surrounded by a light transmissive casing formed of a transparent resin or the like. .

In the light emitting device 1, the red light emitting diode element DR, the blue light emitting diode element DB, and the green light emitting diode element DG are radially arranged at an angle of 120 ° with each other, and The anode terminal of the red light-emitting diode element DR, the anode terminal of the blue light-emitting diode element DB, and the anode terminal of the green light-emitting diode element DG are electrically connected at the center point, and common from the connection point. A terminal COM is drawn out of the light transmissive housing. Further, the cathode terminal R of the red light emitting diode element DR, the cathode terminal B of the blue light emitting diode element DB, and the cathode terminal G of the green light emitting diode element DG are external to the light transmissive housing. Has been pulled out.

When driving the light emitting device 1 having the above configuration, a resistor r1 and a variable voltage source V1 are connected in series between the cathode terminal R drawn from the red light emitting diode element DR and the common terminal COM. A first current variable control circuit formed by connecting is connected, and a resistor r2 and a variable voltage source V2 are connected in series between the cathode terminal G drawn from the green light emitting diode element DG and the common terminal COM. And a resistor r3 and a variable voltage source V3 connected in series between the cathode terminal B drawn from the blue light emitting diode element DB and the common terminal COM. The third variable current control circuit is connected.

Since each of the light emitting diode elements DR, DG, DB becomes brighter as the voltage of the voltage sources V1, V2, V3 becomes higher, the light emitting diode elements DR, DG, DB of the voltage sources V1, V2, V3 become brighter. The light emission brightness of each light emitting diode DR, DG, DB is adjusted by arbitrarily adjusting the voltage. The red light, the green light, and the blue light emitted from each of the light emitting diodes DR, DG, and DB are mixed with each other to form one color, which is output through the light transmissive casing, but the three primary colors of light. Since all colors can be created by adjusting the degree of each of red light, green light, and blue light, the voltage of the voltage sources V1, V2, and V3 can be arbitrarily adjusted to adjust the light emitting diodes DR, The light emitting device can emit all colors by adjusting the currents flowing through DG and DB, respectively.

Further, instead of each of the light emitting diode elements DR, DG, and DB, a red light emitting element in which a white bulb is provided with a red filter, a green light emitting element in which a white bulb is provided with a green filter, and a white bulb is provided with a blue filter. Alternatively, a blue light emitting element may be used. Further, as each light emitting element of the light emitting device, the light emitting diode element and a color light emitting element in which a white bulb is provided with a color filter may be mixed.

[0014]

[Effect of device]

 According to the present invention configured as described above, light of an arbitrary color can be freely created and emitted, so that it is possible to output a plurality of information by color display, and the light emitting device can be used to output light such as light emitting diodes. It is possible to substitute the light emitting elements of all colors.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 light emitting device DR red light emitting diode element DG green light emitting diode element DB blue light emitting diode element COM common terminals V1 to V3 variable voltage source r1 to r3 resistance

Claims (1)

[Scope of utility model registration request] 1. A red light emitting element which emits red light and whose emission brightness changes according to the amount of current applied, a blue light emitting element which emits blue light and whose emission brightness changes according to the amount of current applied, and a light emitting element which emits green light What is claimed is: 1. A light-emitting device comprising a green light-emitting element, whose light-emission luminance changes according to the amount of energized current, surrounded by a single light-transmissive housing, wherein a first current variable terminal is connected to a terminal drawn from the red light-emitting element. A control circuit is connected, a second current variable control circuit is connected to the terminal drawn from the blue light emitting element, and a third current variable control circuit is connected to the terminal drawn from the green light emitting element. A light-emitting device characterized by the above.