Keyboard multiple switch assembly

Details Keyboard multiple switch assembly Keyboard multiple switch assembly

1979-04-02

1981-06-23

Wright, Jr., Ernest T.

Typewriting machines

Key-board or key lever-actuating mechanism

Including means generating a signal for type selecting or...

400479, 4004791, 4004912, 400368, 200 5R, 200DIG1, 340365C, B41J 508

Patent

active

042747520

ABSTRACT:
An electronic switch keyboard for typewriters or office machines includes a multiple switch at selected key positions to provide two signal inputs to a utilization device. A first capacitor switch is actuated to provide a first signal upon initial key depression and a second contact switch, common to all selected key positions, is actuated to provide a second signal upon further key depression at the selected key positions. A ground plane forms a portion of the contact switch and further serves to reduce parasitic capacitance and to shield the capacitive switches from stray electrical noise occasioned by the contact switch or other electrical inputs. A dielectric material is used to accurately separate the ground plane from the capacitive switch and further serves as a force spreading device for the contact switch. When the keyboard is used in conjunction with a typewriter, the first signal may be used to effect character selection and printing and the second signal to effect repeated printing of the same character. Consistent with prior mechanical typewriter keyboards, three increasing levels of force are required to be overcome as the key is depressed: a pretravel force, a first switch actuation force, and a second switch actuation force.

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