Soundwave position digitizer

Details Soundwave position digitizer Soundwave position digitizer

1983-12-01

1988-09-20

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

367907, 367117, 340706, G08C 2100

Patent

active

047727640

ABSTRACT:
A sound wave position digitizer has a pair of sound wave beam transducers, each spaced a predetermined distance from the edges of a data surface such that the beams intersect on the data surface at substantially orthogonal angles. The beams are folded by reflectors to achieve compactness and, to further improve the form factor, the beams are coupled to the folding reflectors by acoustic horns which intersect and have a common section.

REFERENCES:
patent: 3733580 (1973-05-01), Beekem
patent: 4317005 (1982-02-01), de Bruyne

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