News Center

What are the classifications of membrane switches?

Release time:

2023-06-06 08:48

(1) Military membrane switch
The biggest difference between the two is the usage environment, which is quite harsh for military thin film switches. In terms of environmental temperature alone, its working conditions not only need to meet the requirements of -54~70 degrees, but also need to withstand temperature shocks of -55~100 degrees and 3 cycles. Moreover, in foreign military standards, the operating temperature for high-temperature testing is set at 125 degrees Celsius, and the high-temperature storage temperature is 150 degrees Celsius. It is obvious that commercial thin film switches are not suitable for working in such harsh military environments.
(2) Commercial membrane switch
In the Mechanical Industry Standard of the China JB5045-91 "Technical Conditions for Membrane Keyboard technology" issued on July 1, 1991 and implemented in 1992, the assessment criteria for membrane switch high, low temperature, constant damp heat and temperature change are: high temperature: (55+/-2) degrees (72h) low temperature: (-40+/-3) degrees (16h)
Constant damp heat: (40+/-2) degrees {relative humidity is 96%+/- (2-3)%, lasting for 96 hours} temperature change: -40~50 degrees After 5 cycles of testing, recover for 2 hours under normal atmospheric conditions. Any thin film switch that can pass this assessment condition and has the general function of a thin film switch can usually be called a commercial thin film switch, which is the most common and characteristic product of thin film switches. The panel layer of commercial thin film switches is usually PC or PET thin film as the substrate, and the circuit substrate is conductive silver paste or conductive silver carbon paste mixed paste; the carrier of conductive printing material Using PET film. Due to the considerations of application environment and reducing manufacturing costs, the isolation layer is usually made of cheap PVC film.

Recommended News