Tact switches belong to the category of electronic switches, which are now used in mobile phones, digital cameras and other related electronics industries.
Tact switches belong to the category of electronic switches, which are now used in mobile phones, digital cameras and other related electronics industries. The inside is made on and off by tiny metal shrapnel. The tact switches in mobile phones are generally relatively small. The tact switches used in mobile phones have a crisp feel when pressed. What does the tact switch used in mobile phones look like?
The size of the mobile phone tact switch is small, and it is a patch tact switch, which can be reflow soldered. For braid packaging, in order to increase the placement density of components on the printed circuit board, it can be installed in high-density compact cell phone devices.
Operating force: 100g 130g 160g.
The silicone buttons used on the mobile phone require hand feel, lifespan, and strength. These three points are complementary to each other. If you increase one of them, the center of gravity will be weakened compared to the other two.
The shrapnel has higher requirements, and the hand feels crisp.
Frequent pressing will cause the metal shrapnel to lose its elasticity and fail due to fatigue. Therefore, the buttons of most electrical appliances are directly replaced by conductive rubber or metal shrapnel for pot switches, such as computer keyboards and remote controls.
It is required to be halogen-free and obtain RoHS environmental protection certification. Halogen-free flame-retardant conductive, flame-retardant UL94-V0 level. With the progress of society, human beings have higher and higher requirements for environmental protection, and the halogen-free requirements of products are also highly valued. Many domestic and foreign companies (DELL, APPLE, NOKIA, PANASONIC, HP, etc.) have or are requesting their suppliers to provide halogen-free products, and the use of halogen-free products continues to grow.
High quality materials and long service life.
Touch the material of the switch housing. The main switch brands on the market generally use PC materials. The characteristics of impact resistance, high temperature resistance, and resistance to discoloration are very important for controlling electrical switches. The front panel of the touch switch and the base on the back are made of PC material. Manufacturers of this parameter will make different specifications according to the requirements of different customers. The larger the parameter, the greater the strength and the strong feel. Of course, it will also affect the life of the button. The life of the tact switch industry is generally more than 100,000 times, and the part that affects the life is Only under special circumstances will it be considered.
The contact points of conductive parts during switching.
There are currently three main types of contacts, silver-nickel alloy, silver-cadmium alloy and pure silver. Silver-nickel alloy is currently an ideal contact material, with good conductivity and hardness, and it is not easy to oxidize and rust. Silver-cadmium alloy contacts are also good in other aspects, but cadmium is a heavy metal, on the one hand, it is harmful to the human body, and on the other hand, the fusion with silver is not ideal. It will form small cadmium metal particles on the surface of the contact, which is conductive. The arc may be pulled out at the time. Pure silver is actually not suitable for contacts. The conductivity is indeed good, but the texture of pure silver is relatively soft and easy to oxidize. The texture is soft. If the switch has more contacts, it will be deformed; if oxidation is rusted, the conductivity will be much worse, and rust dots are also easy to heat up, and it is easy to burn the contacts.
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