Capacitive touch key

Abstract

The invention provides a capacitive touch key. The capacitive touch key comprises a key unit, a touch module and an elastic element, the touch module is provided with a first transparent conductive layer; the key unit comprises a light guide body and a metal frame body, a body of the metal frame body wraps the side face of the light guide body, the top face of the light guide body is exposed, an extending part extends from the periphery of the bottom end of the body, the projection part of the extending part is overlapped with the first transparent conducting layer, and in addition, a second transparent conducting layer electrically connected with the extending part can also be arranged. The elastic element is connected between the key unit and the touch module, when a user carries out touch operation, the key unit is pressed towards the touch module, and the capacitance value between the extending part or the second transparent conducting layer and the first transparent conducting layer is changed. Therefore, the equivalent distance between the finger and the induction electrode can be greatly reduced, and the induction quantity of the touch signal is improved.

Description

technical field [0001] The invention belongs to the field of touch technology, and in particular relates to a capacitive touch key which can increase the amount of touch signals. Background technique [0002] Touch technology has developed rapidly in recent years and is widely used in many consumer electronic devices, such as notebook computers, tablet computers and smart phones, and has gradually expanded to medical instruments, automation equipment, household appliances and automotive devices etc. The mainstream of the touch interface is the touch screen (Touch panel) and the touch pad (Touch pad), which can replace the traditional mechanical buttons, allowing the electronic device to add a larger operating space. However, while pursuing technology, despite the many advantages of these touch interfaces, some electronic devices, such as satellite navigation devices, car audio-visual equipment, aircraft cockpit display panels, electronic game consoles, etc., still need to d...

AI Technical Summary

Problems solved by technology

[0003] Typical capacitive touch button design usually uses plastic material as the button body to cover the sensing element, but too thick plastic buttons are prone to poor induction and affect the touch effect

Please refer to figure 1 , which shows a capacitive touch button 10 that can dynamically display different contents. The button body 11 is made of transparent plastic material, which belongs to a non-conductive medium. Since the medium has a certain thickness and the elastic element 13 below it, it will As a result, the capacitance that can sense fingers is extremely small, and the touch chip (Touch IC) 12 must enhance the sensitivity of sensing touch signals, otherwise it will be difficult to achieve the touch effect

[0004] Therefore, above-mentioned prior art still has room for improvement and development

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