Choose the thickness of the membrane keypads raw material

Membrane keypads are the basic structure of "keypad + membrane", so the touch and characteristics of the keypads are largely determined by the design of the membrane keypads. The separation of the switch contacts and the reliability of the rebound force, the thickness of the film raw material is generally selected at 0.125-0.2mm for the best, the raw material is too thin and the rebound is weak, and the contact separation is not sensitive. The raw material is too thick and the response is slow to increase the operation strength. If the keypad area is large, for example, when the length of the square keypad or the diameter of the circular keypad is greater than 12mm, a film with a thickness of 0.15 or 0.2 mm should be used. The film is thicker, the rebound is strong, and the tendency of the film to relax after the key is pressed for many times is reduced, so as to ensure the normal operation of the contact point. When the isolation layer is too thin, the thickness of the circuit substrate film should be thicker, and the too thin membrane is prone to contact conduction. Flat membrane switch keypads can use a thicker membrane material, and the membrane used for embossing of circuit contacts should generally be 0.125mm thick membrane, only when the embossed ball diameter is large and the chord height of the ball top is small. lower, a thicker film will be used. Membrane keypad is an essential structure in electronic keyboard products. It is a built-in conductive film in metal dome key products and conductive adhesive keypad products. The function of membrane keypads is to play the conductive role of membrane switches in keypad products. Conductive foils on circuit boards. The structure of the membrane button is very simple, you can see the membrane circuit and circuit board under the button by directly removing the contact button into the panel.
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