A touch switch is a common form of switch in electronic devices, which operates by triggering the switch with the user's touch to control the opening or closing of the circuit. This article will delve into the working principle of touch switches and explore relevant knowledge points.
1、 Construction and constituent components
A light touch switch usually consists of a shell, trigger button, spring, contact, wiring terminal, etc. The function of the casing is to protect the internal components of the switch and provide fixed installation support. The trigger button is a part of the user's touch operation that triggers the action of the switch by applying pressure to the button. The spring provides the force to reset the button, allowing it to return to its original position after being released. The contacts are two opposite electrodes inside the switch, used to open and close the circuit. Terminal blocks are used to connect switches to other circuits.
2、 Working principle of mechanical transmission
The light touch switch adopts a mechanical transmission method to achieve the switching action of the circuit. When the user lightly touches the trigger button, the pressure exerted by the button is transmitted to the spring, causing compression deformation of the spring and shortening the distance between the button and the contact point. When the spring deforms to a certain extent, the distance between the button and the contacts will be short enough to make the contacts come into contact with each other, thus closing the circuit. On the contrary, when the user releases the button, the spring will return to its original state, the distance between the button and the contact will increase, the contacts will separate from each other, and the circuit will be disconnected.
3、 The function of contacts and circuits
The contact of a light touch switch plays a very important role in determining whether the button can conduct current when it touches the contact. Contacts are usually made of metal and have good conductivity. When the contacts come into contact with each other, the circuit closes and current can flow between the contacts, achieving corresponding functions. When the contacts separate, the circuit opens and current cannot flow through the contacts.
4、 Selection of contact material
The selection of contact materials for light touch switches is crucial. The conductivity and durability of contacts determine the performance and lifespan of switches. Usually, contact materials need to meet requirements such as good conductivity, wear resistance, low contact resistance, and corrosion resistance. Common contact materials include silver alloy, gold, copper, etc. Silver alloy contacts have good conductivity and wear resistance, and are often widely used in light touch switches.
5、 Application Fields and Advantages
Light touch switches are widely used in fields such as electronic devices, home appliances, and communication equipment. It has the advantages of small size, easy operation, fast response speed, and silence, making it an indispensable part of modern electronic devices. Users only need to lightly touch to achieve switch operation, which is both convenient and saves physical space.
In summary, the light touch switch achieves the light touch trigger switch action of the button through the working principle of mechanical transmission. The contact or separation of contacts determines the switching state of a circuit, and the selection of contact materials is crucial for the performance and lifespan of the switch. The application of touch switches is extensive and has obvious advantages, not only improving the convenience of operation, but also bringing a better user experience to electronic devices.