Telegraphy – Systems – Position coordinate determination for writing
Patent
1984-06-11
1985-10-01
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
178 19, 336110, 336135, G08C 2100, H01F 2106
Patent
active
045448035
ABSTRACT:
A positional transducer includes a nonconductive plate having four ferrite tube inductors mounted at preselected locations in the plate. Two interconnected permanent magnets are mounted on either side of the plate with opposite poles facing the plate for magnetic interaction. Manual movement of the permanent magnets varies the impedance of the inductors to indicate the relative position of the magnets to the inductors.
REFERENCES:
patent: 4161726 (1979-07-01), Burson
patent: 4320392 (1982-03-01), Giovinazzo
patent: 4375631 (1983-03-01), Goldberg
patent: 4434412 (1984-02-01), Ruumpol
IBM Technical Disclosure Bulletin, vol. 23, No. 8-Jan., 1981, Keyboard Scanned Capacitive Joy Stick Cursor Control, J. E. Fox, p. 3831.
Ceramic Magnetics, Inc.
Schreyer Stafford D.
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