CN202395748U - Touch key device - Google Patents

Abstract

The utility model discloses a touch key device, which comprises a panel and a circuit board arranged behind the panel, wherein the panel is made of light-transmitting materials, a light-tight layer is printed on the panel in a silk-screen manner, and a position corresponding to a key in the light-tight layer is left empty; the circuit board is provided with a light guide hole at a position corresponding to the key, and a light scattering type backlight plate is arranged behind the circuit board. The utility model provides a frivolousization, the response is sensitive stable, and it is soft even to show light, low-cost novel touch button device.

Description

touch button device

technical field

The utility model belongs to the technical field of electric control, in particular to a touch button device.

Background technique

The touch button device is widely used in electric control fields such as home furnishing and electrical appliances, and a user triggers a corresponding control signal by touching a specific area such as a number or a pattern on the device. The touch button device generally includes a panel, a circuit board (i.e. a PCB board) and a light emitting device. In an existing touch button device, the light emitting device usually uses LEDs welded on the PCB for direct lighting, because the LED is a point light source. To obtain uniform light, the sensor panel must be separated from the PCB board by a certain distance, and then the sensor panel and the copper film on the PCB board shall be connected with a conductive medium (such as conductive rubber, metal spring wire, etc.). This seriously hinders the development of thinner and lighter electronic products. At the same time, a conductive medium needs to be added, and an LED is required under each button as a light source, which not only increases the cost, but also is not conducive to energy saving and environmental protection. In addition, due to the existence of the intermediate conductive medium, there is a risk of poor contact between the intermediate conductive medium and the button sensing copper film. For example, when the surface of the copper film is oxidized, it will cause poor contact with the medium.

Utility model content

The purpose of the utility model is to provide a novel touch button device which is light and thin, sensitive and stable, soft and uniform display light, and low cost.

For this reason, the technical scheme adopted by the utility model is as follows: the touch button device includes a panel and a circuit board arranged behind the panel, and it is characterized in that: the panel is made of a light-transmitting material, and is silk-screened with an opaque layer, and The positions corresponding to the keys in the light-tight layer are left empty; the positions corresponding to the keys on the circuit board are provided with light guide holes, and an astigmatism type backlight panel is provided behind the circuit board.

The utility model uses the astigmatism backlight as a light-emitting device, and its light is relatively uniform; when in use, the light emitted by the astigmatism backlight passes through the light guide hole of the circuit board and the blank part of the panel, and is between the transparent layer and the opaque layer. Create contrast between them, so that luminous characters and patterns can be formed.

Because the utility model directly attaches the induction PCB board to the induction panel, reducing intermediate links, it is more sensitive and stable in induction; moreover, since the distance between the light source and the panel does not need to be distanced, the overall thickness is greatly reduced, which is A major breakthrough has been made in the thinning of the product; at the same time, the use of the astigmatism backlight can greatly reduce the LED lights used as the light source of the button panel, which not only saves costs, but also makes the product more energy-saving and environmentally friendly; in addition, this touch button and LED Compared with the touch button as a light source, the light is softer and more uniform.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the front view of the utility model.

Fig. 3 is a side view of the utility model.

Detailed ways

See attached picture. This embodiment includes a panel 1 , a circuit board 2 arranged behind the panel 1 , and a diffused backlight 4 arranged behind the circuit board 2 . The panel 1 is made of light-transmitting material, and its surface is screen-printed with an opaque layer 5 , and the position corresponding to the button 3 in the opaque layer 5 is left empty. A second light guide hole 6 is opened on the circuit board 2 corresponding to the button 3 ; and a key sensing area 8 is provided around the second light guide hole 6 on the front of the circuit board 2 .

In this embodiment, the astigmatism backlight 4 is used as a light-emitting device, and the light is relatively uniform; when in use, the light emitted by the astigmatism backlight 4 passes through the second light guide hole 6 of the circuit board 2 and the empty part of the panel 1, A contrast is formed between the transparent layer 7 and the opaque layer 5 of the panel 1 , so that the illuminated keys 3 can be formed on the panel 1 .

Claims (1)

1. touch button device, the circuit board after comprising panel and being arranged on panel is characterized in that: panel adopts light transmissive material to process, and silk-screen has light non-transmittable layers, and leave a blank in the position corresponding with button in light non-transmittable layers; Position corresponding with button on the circuit board offers light-conductive hole, is provided with an astigmatic type backlight behind the circuit board.

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