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Capacitive touch key system

A key system and capacitive touch technology, which is applied in the electronic field, can solve the problems of capacitive touch performance, limited service life of mechanical keys, and unsightly mechanical keys, etc., to improve anti-interference ability, not easy to deform, and large support strength Effect

Active Publication Date: 2015-08-05
JIANGSU HUITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The abrupt appearance of traditional mechanical keys is obviously not beautiful and not easy to clean. At the same time, the service life of mechanical keys is limited and the use experience is poor; the capacitive touch key systems that are more commonly used now use plastic as the panel material, and strict control is required. Metal composition, otherwise it will greatly affect the performance of capacitive touch

Method used

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  • Capacitive touch key system
  • Capacitive touch key system
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Examples

Experimental program
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Effect test

Embodiment Construction

[0043] The invention utilizes metal as the panel of the touch key, and realizes the touch key of the metal panel.

[0044] Moreover, the present invention uses the change of the capacitance between the vertical electrodes as a detection signal to determine the displacement of the key. Among them, according to the principle of electromagnetism, when a very thin polar plate and another polar plate are placed vertically with a certain gap, if a voltage is applied between the two polar plates, an electric field will be formed between the two polar plates, which is called a fringe electric field. This phenomenon is called fringe electric field effect, and such capacitance between vertical electrode plates is called fringe electric field effect capacitance. According to the mirror image principle and complex variable function theory, the mathematical relationship between the capacitance between the two plates and the gap between the plates can be established:

[0045] ...

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Abstract

A capacitive touch button system comprises a button panel (100), a vertical electrode (8) and a sensing element (72). The button panel (100) comprises a touch button (92) made of metal. Between the vertical electrode (8) and the touch button (92), a gap exists and an included angle is formed. The sensing element (72) is used for detecting the change of the capacitance between the touch button (92) and the vertical electrode (8). The metal touch button (92) and the metal sheet vertical electrode (8) form a capacitor that has the fringe field effect. The change of capacitance that occurs because of the change of the distance between the electrode plates of the capacitor is more sensitive than that of a parallel plate capacitor and can be sensed by the sensing element (72) more easily, and is therefore used as the input of button action signals, and compared with a parallel plate capacitive touch button, more sensitive sensing can be achieved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a touch button system. Background technique [0002] The capacitive button panels that are commonly used now are generally plastic and do not contain metal components, otherwise it is easy to cause misplaced triggers. Under the cover of the plastic panel, the touch can be detected directly above the sensing plate of the detection board, but if If the panel is made of metal or contains metal components, the buttons can be triggered by touching any position on the panel, which makes it impossible to distinguish the positions of each button and to determine which button a certain trigger belongs to. [0003] Now some occasions or products need to use metal material as the appearance panel of the product. If you want to improve the quality of the product, the appearance design and the control experience are very important, and the control experience is most directly related to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/975
CPCH03K17/9622G06F3/044H03K2217/960705H03K17/98H03K2217/960755G06F3/0443
Inventor 龙涛刘正东龙江姚理觉陶冬冬
Owner JIANGSU HUITONG GRP