Position-determining system

Details Position-determining system Position-determining system

1979-10-15

1982-02-23

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

178 18, G08C 2100

Patent

active

043170056

ABSTRACT:
A graphic position-determining system incorporating two Sell-type transducers that generate acoustic shockwaves and receive their reflections from a surface whose position is to be determined and from fixed calibration reflectors positioned at known distances from the transducers. The design of the transducer includes plastic microspheres between a metalized membrane and a back-electrode to improve the sensitivity, the back-electrode having non-parallel surfaces to reduce unwanted vibrations and permit rapid damping. Apparatus is illustrated for determining the position of a movable cursor and for the verification or transmission of handwriting.

REFERENCES:
patent: 3613066 (1971-10-01), Cooreman
patent: 3653031 (1972-03-01), Hlady et al.
patent: 4012588 (1977-03-01), Davis et al.
patent: 4018989 (1977-04-01), Snyder et al.
patent: 4081603 (1978-03-01), Davis et al.

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