What Are The Precautions For Key Switches, Do You Know?

The key switch mainly refers to the light touch key switch, also known as the light touch switch. The key switch is an electronic switch, which belongs to the category of electronic components. It first appeared in Japan [called: sensitive switch]. When used, the switch function is closed and turned on by applying pressure to the switch operating direction to meet the conditions of the operating force. When the pressure is on, the switch is disconnected, and its internal structure is realized by the change of the force of the metal shrapnel. The key switch is composed of an insert, a base, a shrapnel, a button, and a cover plate, and a layer of polyimide film is added to the shrapnel for the waterproof tact switch.

The key switch has the advantages of small contact resistance load, accurate operating force error, and diversified specifications. It has been widely used in electronic equipment and white goods, such as audio and video products, digital products, remote controls, communication products, and household appliances. , Security products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pen buttons and so on. Because of the environmental conditions of the key switch (elastic force with pressure less than 2 times/environmental temperature and humidity conditions and electrical performance), large equipment and high-load buttons are directly replaced by conductive rubber or dome switch hardware shrapnel, such as medical equipment, TV. machine remote control, etc.

Regarding the pin position of the five-pin key switch: two pins are a group, when the switch body is properly pressurized, the four pins are conducting, and the fifth pin is grounding.

The key switch is the fourth-generation switch product developed with the development of electronic technology. The earliest volume is 12mm*12mm, 8mm*8mm, and now it is 6mm*6mm. There are three types of product structure: vertical type, horizontal type and horizontal type with ground end. Now there are two types of combination type (3M, 4M, SM, 6M, SM) and potentiometer key switch combination, which meet the requirements of various domestic electronic products. There are three installation sizes: 6.5mm*4.5mm, 5.5mm*4mm and 6mm*4mm. There are 4.5mm*4.5mm small key switches and chip key switches abroad, and the chip key switches are suitable for surface assembly.

Now there is the fifth generation switch-membrane switch, the function is the same as the key switch, mainly used in electronic instruments and CNC machine tools, but the resistance is large and the hand feel is poor. In order to overcome the phenomenon of poor hand feel, there are also contact reeds installed in the membrane switch instead of using the silver layer as the contact point.

Key switches are divided into two categories: key switches that use metal reeds as switch contacts, with small contact resistance, good hand feel, and a crisp "tick" sound. A switch that uses conductive rubber as a contact path is habitually called a conductive rubber switch. The switch feels good, but the contact resistance is large, generally 100-300n. The structure of the key switch is to move down by the key, so that the contact reed or the conductive rubber block contacts the solder tab to form a path.

The working principle of the button switch is that the external force transmitted by the button forms a force for manufacturing transmission inside the switch. The moving contact and the static contact can be connected or disconnected by pressing the button. And his specific use is to better control the switching of the circuit, so as to ensure the safety of the user's electricity consumption. In fact, in terms of structure, the button switch is very simple, so the scope of application is also very wide. It can be used as a switch for a starting device or a switch for a power supply.

At the same time, the button switch can be divided into single button, double button or triple button according to the different use environments and different functions. The purpose is to realize diversified control through one installation, and such installation can reduce the connection of the circuit, and also It is convenient for users to use. Therefore, when using it, it is necessary to ensure the accuracy of the wiring, and at the same time, check the equipment controlled by the switch to ensure that the direct connection with the switch is stable, and at the same time, the function of the switch can be realized. In this way, the use of button switches is meaningful.

line accuracy. It can be seen from the common characteristics of the switch that the button is turned on when it is pressed, and turned off when it is bounced. If there is a wiring error, different usage modes will appear, especially for some with obvious signs on them. The switch will directly affect everyone's judgment and use.

Therefore, when using it, it is necessary to ensure the accuracy of the wiring, and at the same time, check the equipment controlled by the switch to ensure that the direct connection with the switch is stable, and at the same time, the function of the switch can be realized. In this way, the use of button switches is meaningful.

use:

The main uses of key switches are color TV sets, black and white TV sets, audio equipment, video recorders, video cameras, computers, game consoles, fax machines, walkie-talkies, batons, machine tool control devices, copiers, printers, electronic instruments, meters and other household appliances.