The ASTM defines a membrane switch as a momentary switch device in which at least one contact is on, or made of, a flexible substrate.
A membrane switch usually consist of 2 - 4 layers of PET:
Use in any electrical appliances in which the rebouncing feeling is not important. Classic applications includes microwave oven panel, air conditioner control panel, TV remote control etc. Tactile feedback of keys can be provided by embossing the top PET layer or embedding metal snap domes.
Patent No. 7,589,293 Issued on Sept. 15, Assigned to Darfon Electronics for Membrane Switch Circuit, Keyswitch (Taiwanese Inventors)
Sep 22, 2009; ALEXANDRIA, Va., Sept. 22 -- Liang-Ta Yeh of Taipei County, Taiwan, and Chih-Chung Yen of Taoyuan County, Taiwan, have developed...