Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1987-02-13
1989-10-31
Yusko, Donald J.
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
310340, 310345, 400479, G06F 302, H03M 1100
Patent
active
048780570
ABSTRACT:
A housing is constructed to define individual areas for depression to identify individual indicia such as numbers or the letters of the alphabet. A hard, electrically insulating material is attached to the housing to transmit strains produced in the housing by the depression of the individual areas on the housing. A plurality of thin sheets of an electrically insulating material are provided, each being attached to the insulating material at positions corresponding to the individual areas in the housing. A plurality of thin sheets of an electrically conductive material are also provided, each attached to an associated one of the thin sheets of insulating material. A plurality of ceramic crystals are also included, each attached to an individual one of the electrically conductive sheets. The electrically conductive sheets may be attached to the housing, which is preferably made from an electrically conductive material. This causes one surface of each ceramic crystal to be common to the adjacent area. Each crystal becomes stressed when the keyboard is depressed in the adjacent area on the keyboard. When the crystal becomes stressed, it causes an electrical signal to be generated on the ungrounded surface of the crystal.
REFERENCES:
patent: 3503031 (1970-03-01), Nyhus et al.
patent: 4194083 (1980-03-01), Abe et al.
patent: 4234813 (1980-11-01), Iguuhi et al.
patent: 4737767 (1988-04-01), Kompanek et al.
Kompanek Harry W.
Ming Rickey H.
KDC Corporation
Queen Tyrone
Roston Ellsworth R.
Schwartz Charles H.
Yusko Donald J.
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