| 摘要 |
A membrane circuit board switch used in a keyboard for generating key-pressing signals. The membrane circuit board switch has an upper membrane circuit layer, a lower membrane circuit layer, and a plurality of switch units. Each switch unit has a predetermined space between the upper and lower membrane circuit layers. The membrane circuit board switch particularly has a pressure regulating reservoir communicating with the predetermined spaces. When atmospheric pressure changes, the pressure regulating reservoir will adjust the pressure inside the predetermined spaces to make the predetermined distance keeping substantially constant.
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