3806673 is referenced by 36 patents and cites 8 patents.

A keyboard system particularly useful when a low profile is desirable as in miniature hand held calculators comprises an electrically insulative circuit board on which a plurality of sets of electrically conductive pads are arranged on one surface thereof. Aligned with each set is an actuating element and actuating button. The actuating element is supported on its peripheral edge on at least one pad of a set and upon actuation comes into bridging electrical contact with one or more pole pads of the set which are arranged near the peripheral edge of the actuating element. Certain of the pads are in electrical connection with electrical circuitry arranged on the reverse side of the board. In an alternative embodiment an electrical jumper is provided so that two circuits may cross one another while being maintained electrically separated from one another. For indefinite actuation of an on-off or a constant switch a sliding button switch is employed. The position of the sliding button controls the direction of force exerted by a coil spring and hence actuation of the switch. In another embodiment a double throw switch is shown.

Pushbutton keyboard switch assembly with improved disc spring contact and printed circuit structure
Application Number
Publication Number
Application Date
November 20, 1972
Publication Date
April 23, 1974
Boulanger Henry J
McAndres James P
Connors Jr Edward J
Haug John A
Texas Instruments Incorporated
H01h 13/52
H01H 15/16
G06C 07/02
G06C 07/00
H01H 13/70
H01H 15/00
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