Introduction of FPC membrane key switch

Membrane keys are the basic structure of "key + membrane", so the feel and characteristics of the keys depend on the design of the membrane keys. Considering the reliability of the separation and rebound of the switch contacts, the thickness of the film is generally selected at 0.-0.2mm as the best, too thin, the rebound is weak, and the contact separation is not sensitive. If the thickness is too thick, the response will be slow to increase the operation force. If the key body is larger, for example, when the diagonal length of a square key or the diameter of a circular key is larger than that of a circular key, use a film with a thickness of 0.15 or 0.2 mm. The film is slightly thicker and has a strong rebound. After the key body is pressed for many times, the film has a small tendency to relax, so as to ensure the normal operation of the contact. When the isolation layer is thinner, the thickness of the circuit substrate film should be thicker, and the too thin film is prone to self-passage of the contacts. Flat keys can use a slightly thicker film material, and the film used for circuit contact bubbling should generally use a 0.mm thick film, only when the diameter of the bubbling ball is large and the chord height of the ball top is small. In this case, a thicker film should be used. The membrane key is an essential structure in electronic key products. It is a built-in conductive film in metal spring sheet key products and conductive adhesive key products. The function of membrane keys is to play the role of switch conduction in key products. Conductive foils on circuit boards. The structure of the membrane button is very simple. After directly removing the contact cover and keycap, the membrane circuit and circuit board under the button can be seen.

Why do so many people make membrane key switches, is it a wide range of applications or high profits?

The scope of application is relatively wide, and there are many such manufacturers. I know Kangde Electronics in Dongguan, and we have cooperated with them, which is not bad.