Acoustic writing combination, comprising a stylus with an associ

Details Acoustic writing combination, comprising a stylus with an associ Acoustic writing combination, comprising a stylus with an associ

1979-04-06

1981-01-20

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

042464390

ABSTRACT:
An acoustic writing combination, includes a stylus with an associated writing tablet. The stylus is provided with two ultrasonic sound sources which upon contact of the stylus with the writing tablet emit pulse-shaped sound signals which are picked up by at least two microphones which are located at the edge of the writing tablet. The two sound sources are situated at different distances from the stylus tip and are operated to alternately produce ultrasonic signals. Point-shaped or circular sound sources may be employed. The circular sound sources may then comprise piezo-electric ceramic rings.

REFERENCES:
patent: 3134099 (1964-05-01), Woo
patent: 3156766 (1964-11-01), Stamps
patent: 3731273 (1973-05-01), Hunt
patent: 3777305 (1973-12-01), Stoutmeyer
patent: 3838212 (1974-09-01), Whetstone et al.

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