Detection electrode of a touch switch

Abstract

The invention provides a detection electrode of a touch switch, capable of suppressing detection sensitivity error of the touch switch. The detection electrode of the touch switch is arranged between a panel and a base plate (40) and the base plate is arranged at one side of the back of the panel and the back and the panel are interspaced at a distance. In addition, the detection electrode is connected with a detection loop and the detection electrode is used as one electrode of a capacitor and electric signal value corresponding with the capacitance of the capacitor is input into the detection loop and detected by the detection loop and the output value of the detection loop is changed when the capacitance changes. The detection electrode of the touch switch comprises a fixed electrode (42) fixed on the base plate and connected with the detection loop; at least one pair of spring electrodes (30) arranged between the fixed electrode and the panel. In the detection electrode of the touch switch, because the orientation of the spring electrode (30a) is opposite to the orientation of the spring electrode (30b), the detection sensitivity error of the touch switch is suppressed.

Description

technical field [0001] The invention relates to a detection electrode, which is used to form a touch switch such as a proximity switch or a non-contact switch. In particular, the present invention relates to a detection electrode of a capacitive touch switch, which is used to detect whether an operator has touched the surface of the panel on the back of the panel. Background technique [0002] Among electric appliances or gas appliances (hereinafter referred to as appliances), some appliances have panels exposed to the outside. If a proximity switch or a non-contact switch is provided on the back of the panel, it can be detected whether the operator has touched the surface of the panel. According to the above structure, since the operator can operate the appliance by touching the surface of the panel, the operability is ideal. Hereinafter, a switch for detecting whether or not a panel surface is touched is referred to as a touch switch. [0003] Figure 9 It is a schemati...

AI Technical Summary

Problems solved by technology

[0010] Conductive foam is made of a mixture of conductor (metal or carbon) and soft rubber or resin, because the ratio of rubber or resin additives or the degree of foaming will vary depending on the manufacturing conditions or manufacturing environment (temperature, humidity, etc.) Therefore, the resistance value and other characteristics of the conductive foam are prone to deviation, so it is difficult to maintain the detection sensitivity of the touch switch at a certain level.

In addition, since the characteristics of the conductive foam are likely to change due to changes in the use environment, it is difficult to maintain a constant detection sensitivity of the touch switch.

Also, since the characteristics of the conductive foam tend to change over time, it is difficult to maintain a constant detection sensitivity of the touch switch over a long period of time.

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