KR19980075424A - Optical dial key button structure using optical fiber - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a key button structure that uses an optical fiber to function as an optical dial.

I. The technical problem to be solved by the invention

It provides a key button structure with an optical dial function that enables power-on and NPO functions to be operated on a single-sided PCB in a telephone terminal, and an optical dial function can be used to reduce the cost of a product by operating an optical dial function using an optical fiber.

All. Summary of Solution of the Invention

The optical fiber is installed at the lower end of the key button installed in the telephone terminal, and one light emitting diode and the optical fiber sealed on the printed circuit board are sealed with the optical connection shrink tube to lift the handset of the telephone terminal or press the call key. The light emitted from the light emitting diode is emitted to each key button through the optical fiber to implement the optical dial function.

la. Important uses of the invention

Applies to telephone terminals.

Description

Optical dial key button structure using optical fiber

The present invention relates to a key button structure having an optical dial function of a telephone terminal, and more particularly, to a key button structure having an optical dial function using an optical fiber.

In general, the optical dial function of a telephone terminal (key phone, general telephone, facsimile, etc.) is a function to allow a key button to emit light at the same time to give a high-quality image to facilitate dialing at night.

1 is a structural diagram of a key button having an optical dial function of a conventional telephone terminal.

The phone terminal is composed of an upper case 12 and a lower case, and a plurality of numeric key buttons and function buttons 10 are arranged in the upper surface of the upper case 12 in a visible manner. Sheet 18 is installed below the key button 10, and the key button and the keypad 16 are connected to perform an operation. A printed circuit board 14 is provided below the keypad 16, and a plurality of contact portions 16b and a plurality of light emitting diodes 20 are connected to the bottom surface of the keypad 16 and the top surface of the printed circuit board 14, respectively. Therefore, when the user uses a telephone, picks up a handset, or operates a call button, the light emitting diode 20 operates to emit light so that the user can easily identify the key button at night. At this time, the light of the bladder diode 20 reaches the key button 10 through the sheet 18 is emitted to the outside to become a lighted key button.

As described above, the key button structure having the function of the conventional optical dial has a problem in that the cost of the product is increased because the light emitting diode is used for each key button.

In addition, it is difficult to insert the NPO (NO Power Operation) function from the single-sided PCB (Print Circuit Board) due to the difficulty of the first and second separation due to the light emitting diode, so that the NPO function can be inserted only when the PCB is double-sided. there was.

Accordingly, an object of the present invention is to provide a key button structure having an optical dial function for operating an optical dial function using an optical fiber.

Another object of the present invention is to provide a key button structure having an optical dial function capable of operating a power-on and NPO function on a single-sided PCB.

It is still another object of the present invention to provide a key button structure having an optical dial function capable of reducing the cost of a product by operating an optical dial function using an optical fiber.

The present invention for achieving the above object, the optical fiber is installed on the lower end of the key button is installed in the telephone terminal, and one light-emitting diode and the optical fiber installed on the printed circuit board by sealing the optical connection shrink tube of the handset of the telephone terminal When the user presses or presses a call key, the light emitted from the one light emitting diode is diverted to each key button through the optical fiber to implement an optical dial function.

1 is a structural diagram of a key button having an optical dial function of a conventional telephone terminal

2 is a key button structure diagram having an optical dial function according to an embodiment of the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a key button structure diagram having an optical dial function according to an embodiment of the present invention.

The upper case 12 is installed so that the user is visually aligned with the key button 10, the optical fiber 22 is installed on the bottom surface of the key button 10. The light emitting diode 25 and the optical fiber 22, which are installed on the printed board and emit light under the control of the CPU, are sealed using the optical connection shrink tube 24. The optical connection contraction tube 24 prevents light emitted from the light emitting diodes 25 from being emitted to the outside so as to have directivity of the light. The keypad 16 is provided at the lower end of the key button on which the optical fiber 22 is installed, and the printed circuit board 14 is connected to the lower end of the keypad 16. A plurality of connection parts 14a are provided between the printed circuit board 14 and the keypad 16. The optical fiber 22 is provided on the bottom surface of every key button. Therefore, when you pick up the handset of the telephone terminal or press the call button, the light emitting diodes 26 are emitted, and the light emitted from the light emitting diodes 26 is emitted to all the key buttons through the optical fiber 22, so that the user can press the numeric key button or the function key button at night. Can be recognized. The telephone terminal is operated by the rectified power source after the voltage drop of the AC power source, and the light emitting diode 26 is also operated by the rectified power source. At this time, when the power plug is disconnected or the power for driving the phone is turned off due to a power failure, the LED is switched to be supplied to the light emitting diodes 26 by the power supplied from the telephone line. Light is emitted.

As described above, the present invention connects one light emitting diode to an optical fiber so that the optical dial function can be operated when the handset is lifted or a call key is pressed. Therefore, the light emitting diode is not used for each key button, thereby reducing the cost of the product. In addition, there is an advantage to perform the optical dial function by switching to the power of the telephone line when the power supply is cut off NPO.

Claims (2)

In a key button structure having an optical dial function, The optical fiber is installed at the lower end of the key button installed in the telephone terminal, and one light emitting diode and the optical fiber sealed on the printed circuit board are sealed with the optical connection shrink tube to lift the handset of the telephone terminal or press the call key. A key button structure having an optical dial function in a telephone terminal, characterized in that to emit light emitted from the light emitting diode to each key button through the optical fiber to implement an optical dial function. The method of claim 1, The optical connection shrink tube is a key button structure having an optical dial function in the telephone terminal, characterized in that the light emitted from the light emitting diode is not emitted to the outside to have the directivity of the light.