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Capacitor touch key system

A key system and capacitive touch technology, 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: 2012-04-25
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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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

The invention discloses a capacitor touch key system, which comprises a key panel, a vertical electrode and a sensor component, wherein the key panel comprises a touch key made of metal; a gap and an included angle are formed between the vertical electrode and the touch key; and the sensor component is used for detecting capacitance change between the touch key and the vertical electrode. The capacitance change caused by distance change of plates in an edge electric field effect capacitor formed by the metal touch key and the sheetmetal vertical electrode is more sensitive than a general parallel plate capacitor, so the capacitance change is more easily sensed by the sensor component and inputted as a key action signal to realize more sensitive sense than the touch key of the general parallel plate capacitor. A zero pressure touch key structure is realized based on the key system formed by the edge electric field effect capacitor and user experiences are improved.

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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IPC IPC(8): H03K17/975
CPCH03K2217/960705H03K17/98H03K2217/960755G06F3/044H03K17/9622G06F3/0443
Inventor 龙涛刘正东龙江姚理觉陶冬冬
Owner JIANGSU HUITONG GRP
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