Tact switch principle

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Guide: Tactile switch, literally understood as a switch that can change its switch state with a light touch, but does the tact switch really only touch gently? Xiaobian first secretly revealed it to everyone, the tact switch is not the case. Sub, what is the tact switch? What is the principle of the tact switch ?

First, the principle of the touch switch - - Introduction

Tact switch, the English name is Touch switch, also known as button switch, is a kind of switch component in the circuit. The tact switch is closed and turned on under the required external force, and is in an on state. When there is no external force, it is in an off state. It has the advantages of diversified specifications, high precision, small contact resistance, etc., and is widely used in household appliances and digital products. , electronic products such as communication products, computer products, audio and video products.

Second, the touch switch principle - - classification

According to the different principles, the tact switch can be divided into two types. One is to use the metal shrapnel to complete the switch-on and off-state switching. The tactile switch has a good feel. When the button is pressed to a certain extent, the ticking sound appears. The other is to use the conductive rubber to complete the switching of the switch on and off state, the switch feels good, but the contact resistance is large, about 10,000 times the previous one.

Third, the touch switch principle - - structure

The structure of the tact switch is as shown in the following figure. It can be divided into five parts: cover plate, button, spring piece, base, and pin. Among them, the button refers to the external force application; the spring piece is the key component of the tact switch, the switch The continuity is caused by the change of the force of the shrapnel; the pin refers to the connection between the tact switch and the circuit, generally five pins, two or two, and one pin for grounding, when the switch When properly stressed, the four pins are turned on to make the circuit turn on, and when the switch is not pressed by the correct external force, the four pins are not connected, so that the circuit is in the off state.

Fourth, the principle of the touch switch

When we press the button of the tact switch, the shrapnel is deformed by the elastic force to contact the soldering piece, so that the two sets of pins of the switch are turned on, so that the circuit is in a conducting state; and when we withdraw the external force The shrapnel deformation returns to the original state, and the soldering piece is separated, and the two sets of pins of the switch are no longer turned on, thereby causing the circuit to be in an off state.

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