What is a push-button switch? What are its characteristics and functions?-JINBEILI ELECTRICAL

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What is a push-button switch? What are its characteristics and functions?

Oct 13,2022

Push-button switches mainly refer to tactile push-button switches, also known as touch switches. Push-button switches are a type of electronic switch and belong to electronic components. It Initially appeared in Japan and was called a sensitive switch. When in use, the switch function is off, and the switch is turned on in the operating direction to meet the operating force. When the pressure is released, the switch is turned off. Its internal structure is made and turned off by the stress change of the metal leaf. The button consists of an insert, base, elastic sheet, button, and cover plate. A layer of polyimide film is added to the elastic sheet of the waterproof touch switch.

Push-button switches have advantages such as precise operating force error, low contact resistance, and diverse specifications. They are widely used in electronic equipment and white appliances, such as household appliances, communication products, remote controls, digital products, audio-visual products, security products, toys, computer products, medical devices, fitness equipment, money detectors, laser pen buttons, etc. Due to the environmental conditions of push-button switches, large equipment and high-load buttons directly use conductive rubber or metal leaves of pot switches instead, such as TV remote controls 、 Medical devices, etc.

Early The size of the push-button switch is 12mm*12mm and 8mm*8mm Now it is 6mm*6mm . Push-button switches are the 4th generation product developed with the development of electronic technology ， Products include vertical, horizontal, and horizontal types with grounding terminals 。 There are now two combinations (3M 、4M、 SM 、6M、 SM) and potentiometer push-button switch combinations to meet the requirements of various household electronic products. Installation dimensions are 6.5 millimeter *4.5 millimeter, 5.5 millimeter * 4 millimeter and 6 millimeter * 4 millimeter ， Foreign countries have 4.5mm*4.5mm small push-button switches and chip push-button switches. Chip push-button switches are suitable for surface mounting. Now there is a 5th generation product—membrane switch, mainly used in electronic instruments and CNC machine tools. The function is the same as the push-button switch, but the resistance is large, and the feel is poor. In order to overcome the poor feel, some membrane switches use contact reeds instead of the silver layer as the contact point.

Push-button switches are divided into two categories: push-button switches using metal reeds as switch contacts, which have a good feel and low contact resistance, with a "click" sound. Switches using conductive rubber as the contact path are usually called conductive rubber switches. The switch feel is good, but the contact resistance is larger, generally in 100 one 300n between, the structure of the button is that the button moves downward, causing the contact reed or conductive rubber block to contact the pad to form a path.

The operating force of the push-button switch is related to the state of the reed. Initially, the force is proportional to the compression distance of the reed. When the reed is compressed to 5%-70% , the operating force suddenly decreases, accompanied by a "click" sound. Push-button switches generally have two structures, and the operating force curve varies greatly with the geometric shape of the rubber block.

The main uses of push-button switches include color televisions, black and white televisions, audio equipment, video recorders, cameras, computers, fax machines, walkie-talkies, batons, machine tool control devices, copying, printers, electronic instruments, meters, and other household appliances.

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