Membrane switch having a rotary motion detection function
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United States of America Patent
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Apr 16, 1996
Grant Date -
N/A
app pub date -
Sep 14, 1993
filing date -
Sep 14, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A membrane switch having a rotary motion detection function comprises a flexible sheet, in which movable electrodes are formed that correspond to multiple keys, and a printed wiring board, in which fixed electrodes are formed that correspond to the movable electrodes. The flexible sheet and printed wiring board are arranged in layers so that the movable and fixed electrodes face each other with a prescribed spacing between them. When any key on the membrane switch is pressed and thus turned on, that key's signal is detected. When multiple keys are turned on in succession within a prescribed time interval, codes are sent that correspond to the direction and speed of movement of the sequence of turned-on keys. The rotary motion keys are arranged in a circle. The codes that correspond to the direction and speed of shift of the turned-on keys are preset in a microprocessor. The rotary motion keys can be arranged on the same board with other general keys to make up a remote control device.
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