Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-08-08
1981-08-11
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
336 75, 336188, 340365S, G06F 302
Patent
active
042837146
ABSTRACT:
A contactless travel keyboard has first and second coils with elongated loop portions arranged at each key station so that, when an electrically conductive key element at the station is in a key-up position spaced from the coils, electrical input to the first coil results in magnetic induction of a relatively small output signal of a first polarity in the second coil and so that, when the key element moves to a key-down position relatively closer to the coils, electrical input to the first coil induces a current in the key element to magnetically induce a control signal of opposite polarity in the second coil sufficient to reverse the polarity of the output from the second coil. The keyboard includes means responsive to the reversal in polarity of the output signals from the second coils for determining which keys are in a key-down position.
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Delagi Richard G.
Padovani Francois A.
Trenkler George
Groody James J.
Haug John A.
McAndrews James P.
Sharp Melvin
Texas Instruments Incorporated
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