JP3130867U - Button keyboard backlight structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce energy consumption and make luminance uniform with a backlight of a button keyboard.
A plurality of light emitting diodes are installed as needed between a plurality of bullets installed on the front side of a circuit board. The light transmissive keyboard covers the front side with the circuit board bullets, and a plurality of buttons corresponding to the circuit board bullets are installed on the keyboard. On the light reflecting piece installed between the circuit board and the light emitting diode, a plurality of accommodation installation holes are formed so as to correspond to the light emitting diode. Further, a light transmissive light guide plate is installed between the keyboard and the light reflecting piece, and a plurality of button holes and housing installation holes corresponding to the buttons and light emitting diodes of the keyboard are provided therein. The button hole faces one side or the opposite side edge of the keyboard, and the processing section is provided in an annular shape.
[Selection] Figure 5

Description

  The present invention relates to a backlight structure of a button keyboard. In particular, the present invention relates to a backlight structure of a button keyboard having a small light source dose, low energy consumption, and uniform luminance.

  There are many types of application of various button keyboards in the structure of modern 3C products. Regardless of what kind of structure the keyboard is, an appropriate backlight structure is used as an illumination light source when there is insufficient light.

  As shown in FIGS. 1 and 2, a known button keyboard has a backlight structure in which a plurality of separable bullets 11 are installed on the front side of the circuit board 1, and between the bullets 11 as needed. A plurality of light emitting diodes 3 are installed. The light transmissive keyboard 20 covers one side of the circuit board 1 including the bullets 11, and a plurality of buttons 201 are installed on the keyboard 20, respectively corresponding to the bullets 11 of the circuit board 1. To do. In addition, a plurality of recesses 202 are provided between the buttons 201 and correspond to the respective light emitting diodes 3. The light reflecting piece 40 is installed between the circuit board 1 and the keyboard 20, and a plurality of receiving installation holes 401 are installed on the light reflecting piece 40, respectively corresponding to the positions of the respective light emitting diodes 3. When the keyboard 20 and the circuit board 1 sandwich the light reflecting piece 40, the plurality of light emitting diodes 3 are installed in the accommodation installation hole 401 of the light reflecting piece 40 and the recess 202 of the keyboard 20.

  When the button 201 is pressed, the bullets 11 corresponding to each other on the circuit board 1 are touched via the light reflecting piece 40, and the light emitted from the light emitting diode 3 is transmitted to the peripheral light reflecting piece 40. Is reflected upward through the keyboard 20 and passes through the keyboard 20. Thus, the backlight structure of the keyboard 20 is formed.

  However, in the above structure, the light reflecting piece 40 performs only simple light reflection and does not have the light uniforming and diffusing effect. Therefore, the entire backlight effect is partly positioned (part where the light emitting diode 3 is installed). High brightness appears only in, and the brightness of other parts is inferior. This kind of uneven brightness situation is a major drawback in application.

  Further, in the structure shown in FIGS. 3 and 4, a light-transmissive keyboard 2 is installed on the front side of the circuit board 10 that can directly transmit light, and a plurality of bullets are provided on one side of the circuit board 10 facing the keyboard 2. 111 corresponds to each button 21 of the keyboard 2. A plurality of light emitting diodes 3 are installed on the opposite surface of the circuit board 10, and the light guide plate 50 is brought into close contact with one surface of the plurality of light emitting diodes 3 provided in the keyboard 2. An accommodation installation hole 501 is installed and corresponds to the position of each light emitting diode 3. In addition, a plurality of printing sections 502 are installed, corresponding to the bullets 111 of the circuit board 10, and finally, the light guide plate 50 is covered with the light reflecting piece 400. As a result, the plurality of light emitting diodes 3 are accommodated in the accommodation holes 501 of the light guide plate 50.

  When the button 21 is pressed, the bullets 111 corresponding to each other on the circuit board 10 are directly touched, and a part of the light beam emitted from the light emitting diode 3 is directly directed upward, the circuit board 10 and the keyboard. 2, the other light rays are directed downward, reflected by the light reflecting piece 400, further passed through the light guide plate 50 and uniformly diffused, and finally upwards, the circuit board 10, the keyboard 2. To form a complete backlight structure.

In this structure, a part of the light rays diffuses uniformly through the light guide plate 50, so that the entire backlight exhibits a relatively uniform state. However, even in the above-described structure, the light from the light emitting diode 3 does not pass through the keyboard 2 without passing through the circuit board 10 and does not become a backlight. The dose of diode 3 and its energy consumption cannot be reduced, and improvements are required in applications.

  The known button keyboard backlight structure has drawbacks as described above. The inventor has studied the defect and developed the invention.

In order to solve the above problems, the present invention provides the following backlight structure for a button keyboard.
It mainly provides the backlight structure of button keyboard, the whole backlight has uniform brightness, can effectively improve the backlight quality,
It also provides a button keyboard backlight structure, can effectively reduce the energy consumption of the backlight light source, lower the running cost,
That is, it includes a circuit board, a light transmissive keyboard, a light transmissive light guide plate,
The circuit board is provided with a plurality of bullets on the front side, and a plurality of light emitting diodes are installed between the bullets as necessary,
The light-transmissive keyboard covers the front side of the circuit board with the bullets, and has a plurality of buttons on the keyboard, each corresponding to each bullet on the circuit board,
The light reflecting piece is installed between the circuit board and the light emitting diode, and a plurality of housing installation holes are provided on the light reflecting piece to correspond to the light emitting diodes, whereby the light reflecting piece is arranged on the circuit board. Adhering to the top, each accommodation installation hole can accommodate each light emitting diode,
The light-transmitting light guide plate is installed between the keyboard and the light reflecting piece, and a plurality of button holes and a housing installation hole are installed therein, corresponding to the buttons of the keyboard and the light emitting diodes, respectively. The button hole provides a backlight structure for a button keyboard in which a processing section is annularly arranged facing one side or the opposite peripheral edge of the keyboard.

  As described above, the button keyboard backlight structure of the present invention can achieve the functions and effects of low cost, low energy consumption, and uniform brightness, and industrial utility, novelty and progress alligator. Prepare.

  As shown in FIG. 5 which is a structural exploded view of the present invention, FIG. 6 and 7 which are combination instruction diagrams and plane combination sectional views, the present invention mainly includes a circuit board 1, a keyboard 2, a light emitting diode 3, and a light reflecting piece 4. And the light guide plate 5 and the like.

  The circuit board 1 is provided with a plurality of separable bullets 11 on the front side, and the plurality of light emitting diodes 3 are installed at appropriate positions between the bullets 11. A plurality of buttons 21 are installed on the light transmissive keyboard 2 and correspond to the bullets 11 of the circuit board 1, respectively. A plurality of accommodation installation holes 41 are installed on the light reflecting piece 4 and correspond to the respective light emitting diodes 3. As a result, the light reflecting piece 4 is brought into close contact with the circuit board 1, and the light emitting diodes 3 are accommodated by the accommodation mounting holes 41.

The light guide plate 5 is made of a light transmissive material and is installed between the keyboard 2 and the light reflecting piece 4. In order to consider the influence of the thickness after the light reflecting piece 4 and the light guide plate 5 are stacked on the button 21 of the keyboard 2 on the operation of the bullet 11 of the circuit board 1, A plurality of button holes 51 are provided and correspond to the buttons 21 of the keyboard 2 respectively. Thus, it penetrates through the button 21 of the keyboard 2 and comes into contact with the light reflecting piece 4 through the bullet piece 11 of the circuit board 1. In addition, a processing section 52 is provided in a ring shape on one side or the opposite side of the button hole 51 facing the keyboard 2, and the light guide plate 5 is provided with a plurality of accommodation setting holes 53 between the button holes 51. It corresponds to each of the light emitting diodes 3.

  In use, when the button 21 is pressed, the bullets 11 corresponding to each other on the circuit board 1 are touched via the light reflecting piece 4 through the button hole 51 of the light guide plate 5. Thus, the light emitted from the light emitting diode 3 passes through the inner peripheral edge of the accommodation installation hole 53 in the horizontal direction, enters the light guide plate 5, and is reflected vertically by the processing section 52. The reflected light source is directed downward and reflected upward through the light reflecting piece 4 to form a backlight effect.

In the above structure, the processing section 52 can be formed by various methods such as laser engraving, mold texture, roller, pin prick, countersunk, blind via, and etching in addition to printing directly with ink. Moreover, the width of the processing section 52 is desirably 30 mm or less, the inner peripheral edge of the button hole 51 has a smooth surface, and the error in the perpendicularity is desirably within 1 degree.

In the above-described structure of the present invention, since the light guide plate 5 and the light reflecting piece 4 are installed directly on the bottom side of the keyboard 2, a uniform backlight can be emitted with very low energy consumption. Therefore, various 3C products such as PDA, PDA phone, indoor phone, mobile phone terminal, GPS PDA, PURE GPS, printer, copy machine, fax machine, notebook PC, PC, translator, game machine, cash dispenser, ticket vending machine, remote control, etc. Or, it can be widely applied to various 4C products such as cooler panels, automobile audio operation panels, refrigerators and other operation panels.

It is a backlight structure exploded view of a well-known button keyboard. It is a plane combination sectional view of Drawing 1. It is a backlight structure exploded view of another kind of well-known button keyboard. It is a plane combination sectional view of FIG. It is a structural exploded view of the present invention. It is a combination instruction diagram of the present invention. It is a plane combination sectional view of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 ... Circuit board, 11 ... Bullet, 2,20 ... Keyboard, 21, 201 ... Button, 202 ... Recessed part, 3 ... Light emitting diode, 4, 40, 400 ... Light reflecting piece, 41, 401, 501, 53 ... accommodating hole, 5, 50 ... light guide plate, 51 ... button hole, 52, 502 ... processing zone, 111 ... bullet.

Claims (5)

Mainly includes at least a circuit board, a light transmissive keyboard, a light transmissive light guide plate,
The circuit board is provided with a plurality of bullets on the front side, and a plurality of light emitting diodes are installed between the bullets as necessary,
The light-transmitting keyboard covers the front side of the circuit board with the bullets, and a plurality of buttons are installed on the keyboard, each corresponding to each bullet on the circuit board,
The light transmissive light guide plate is installed between the keyboard and the circuit board, and a plurality of button holes and a housing installation hole are installed therein, corresponding to the buttons of the keyboard and the light emitting diodes, respectively. A backlight structure for a button keyboard, characterized in that a processing section is provided in a ring shape on one side edge facing the keyboard of the hole.   The light reflection piece is installed between the circuit board and the light guide plate, and a plurality of accommodation installation holes are installed on the light reflection piece, and the light emitting diodes can be installed correspondingly. The backlight structure of the button keyboard according to 1.   2. The button keyboard backlight structure according to claim 1, wherein the width of the processing section is 30 mm or less.   2. The processing area is selected from ink printing, laser engraving, mold texture, roller, pin prick, countersunk, blind via, etching, and the like, and is molded around the periphery of the button hole. Button keyboard backlight structure. The button keyboard backlight structure according to claim 1, wherein the inner peripheral edge of the button hole has a smooth surface, and an error in verticality is preferably within 1 degree.

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