FPC thin film key switch solution FPC thin film key switch is a set of keys, indicators and instrument panel functions in one operating system. The utility model is composed of a panel, an upper circuit, an isolation layer and a lower circuit. Pressure film switch, upper circuit contact downward deformation, lower circuit board contact conduction, finger release, upper circuit contact rebound, circuit open, trigger signal. Film keys, in addition, 1.00 mm outlet distance of the Silver Paste circuit is very simple, it is easy to be bad plug conductor puncture; keys do not rebound, completely lost elasticity is what situation? There are two types of touch sensitive membrane switches: those cartridges and those blister circuits. The key elastic loss is the deformation and elastic loss of the key internal elastic fragments or bubbles. In the process of packaging, transportation and storage, the elastic membrane switch is subjected to great pressure, which easily leads to the deformation of the shrapnel and the weakening of the handle, and finally loses its elasticity completely and deforms during the Second Assembly. Similarly, if the user did not paste the first time during the installation process, the second time the paste tear, the shrapnel will also be deformed. Therefore, the FPC film key switch in the production and installation process need to do a good job with shrapnel. On the circuit of the bubble film switch (some are directly outside the board surface of the bubble) , each link also to prevent heavy pressure to prevent bubble deformation. It also prevents use at high temperatures, where the heat expands and contracts, and the button is simple and soft, after all, the spring is completely inoperative. Consistency of key forces is also important for circuit drums. The surface glue on the circuit and the air vent of the interlayer can make the consistency strength of the key better, and also can avoid the key not to rebound.