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What are the classifications of membrane switches?

From:admin Date: 2019-01-14
What are the classifications of membrane switches?
(1) Military membrane switch
The biggest difference between the two is that the environment used is different, and the use of military membrane switches is quite harsh. In terms of ambient temperature alone, the working conditions need not only meet -54 to 70 degrees, but it also requires a temperature shock of -55 to 100 degrees and three cycles. Moreover, in foreign military standards, the high temperature test specifies a working temperature of 125 degrees and a high temperature storage temperature of 150 degrees. It is obvious that commercial membrane switches are not suitable for working in such a harsh military environment.
(2) Commercial membrane switch
It was released on July 1, 1991. In 1992, the People's Republic of China Machinery Industry Standard JB5045--91 "Thin Membrane Keyboard Technical Conditions" was used to evaluate the high, low temperature, constant damp heat and temperature changes of the membrane switch: high temperature: (55) +/-2) degrees (72h) low temperature: (-40+/-3) degrees (16h)
Constant damp heat: (40 +/- 2) degrees {relative humidity 96% +/- (2~3)%, over 96h} Temperature change: -40~50 degrees (after 5 cycles of test, under normal atmospheric conditions Recovery 2h Any membrane switch that can pass this assessment condition and has the general function of membrane switch is usually called commercial membrane switch. It is the most common and most membrane switch characteristic of membrane switch. The panel of commercial membrane switch The layer is usually a PC or PET film as a substrate, the circuit substrate is a conductive silver paste, or a conductive silver carbon paste mixed slurry; the conductive printing material is a PET film, which is isolated for application environment and reducing manufacturing cost. The layers are usually made of inexpensive PVC film.
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