Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1975-01-10
1977-07-05
Smith, Jr., David
Electrical transmission or interconnection systems
Switching systems
Condition responsive
200DIG1, 340365C, 361288, H01H 3500
Patent
active
040342344
ABSTRACT:
A switching module for a solid-state keyboard or the like comprising an actuating key manually movable between a first and a second position and a variable capacitor. The capacitor has a rigid stationary electrode and another electrode movable toward and away from the stationary electrode between a first position in which the electrodes are separated by an air gap and a second position in which the air gap is substantially eliminated for effecting a change in capacitance of the variable capacitor. The movable electrode has a rigid dielectric member secured thereto on its side toward the stationary electrode, this dielectric member having a dielectric constant substantially greater than air. The switching module further comprises a cam coupling the actuating key and the movable electrode for effecting movement of the movable electrode and the dielectric member between their first and second positions in response to movement of the actuating key between its first and second positions.
REFERENCES:
patent: 2452799 (1948-11-01), Speaker et al.
patent: 3653038 (1972-03-01), Webb et al.
patent: 3659163 (1972-04-01), Borison et al.
patent: 3671822 (1972-06-01), Leno
patent: 3760243 (1973-09-01), Perouky
Boulanger Henry J.
Ehlers Brian C.
Haug John A.
Levine Harold
McAndrews James P.
Smith Jr. David
Texas Instruments Incorporated
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