The working principle of side press light touch switch is introduced in detail.
Release time：2018-12-24 Clicks： Click
What is the working principle of the side-press light switch that we often use and what problems should we pay attention to when operating. We will give you detailed details below.
Now in electronics and other industries, the choice of switches will generally choose the side touch switch, so here I want to tell you the specific principle of side touch switch, are you sure not to look at it?
The side touch switch has been continuously improved in the development and function requirements, but its basic structure and principle have not changed. The structure of touch key switch is generally composed of key cap, reset spring, bridge type moving contact, static contact, column type connecting rod and shell. Buttons are not split and closed by external force (i.e. static) when contacted. They are divided into start button, stop button and compound button. Start the button, press the button cover when the contact closes, after loosening the contact automatically open and reset. On the contrary, when the button stops, the contacts are separated when the cover is pressed, and the contacts are automatically closed and reset after loosening. When the button cover is pressed, the bridge-type movable contact moves downward. The normally closed contact is first disconnected and then closed. After loosening the button cover, the normally open contacts are first disconnected and reset, and then the normally open contacts are closed and reset. This is just the most common button switch. In fact, there is an electromagnet adsorption device inside. When you press the button, the electromagnet inside generates magnetism that represents electricity, and then connects or disconnects the circuit through the adsorption device. Thus the remote control function of the line is realized.
In order to reduce the contact resistance, the pins are basically silver plated. SO2 gas in air will oxidize, which directly affects the solderability and contact resistance of the switch. Therefore, the silver-plated thickness of the pin is the first step to achieve high-quality side-press light-touch switch. And silver plating process control in place. The key factor affecting the reliability of conduction is the structure of contact points. Because the function of touch switch is the contact conduction between contact point and shrapnel, the larger the contact surface, the better the contact surface. The contact surface is determined by the structure, and the contact is determined by the combination of the stroke of the touch switch and the shrapnel. The shorter the stroke, the lighter the acoustic life. In the case of fixed shrapnel, the life of light touch switch mainly depends on stroke or sound. In addition, the key factor determining the life of shrapnel is stamping technology.
A good side-press switch is also very important for the life of the whole product. For example, computer keyboard, remote control, etc. If the side-impact switch is not good, the elasticity, fatigue and failure of metal shrapnel will be lost after frequent triggering. Therefore, attention should be paid to the selection of side-impact switch. The quality of the side pressure touch switch directly affects the quality of the factors, mainly depends on the side press touch switch feel, protection, weldability, life, conductive reliability, production process and other factors.