Keyboard switch

Details Keyboard switch Keyboard switch

1977-03-14

1978-09-26

Envall, Jr., R. N.

Electricity: magnetically operated switches, magnets, and electr

Permanent magnet-actuated switches

H01H 5128

Patent

active

041174305

ABSTRACT:
A keyboard switch is actuated by the depression of a magnetized plunger into the region of a magnetic sensing device positioned at the lower extreme of plunger travel. The plunger is integrally formed of a plastic, magnetizable material and has a central, longitudinal opening that receives and registers with the sensor. The change in magnetic field intensity associated with plunger travel is detected by the sensor and translated into a signal representative of switch actuation.

REFERENCES:
patent: 3622926 (1971-11-01), Risk

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