Polar co-ordinate digitizer

Details Polar co-ordinate digitizer Polar co-ordinate digitizer

1990-04-11

1991-04-02

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

33 1M, G08C 2100

Patent

active

050048708

ABSTRACT:
An improved polar co-ordinate digitizer where a cord is extensible from a base unit and moves a cord guide to provide an angle measurement and is also wrapped on a drum whose movement reflects a length measurement. The winding drum is mounted on a common center or shaft with the angle arm on which the cord guide is located. Both rotate separate disks which have their peripheries a bar-code pattern. These are above the drum and cord guide so as to allow unrestricted angular movement of the cord. Light-emitting diode and photo detector means sense the bar-patterns to provide length and angle parameters.

REFERENCES:
patent: 4500749 (1985-02-01), Khnoshnevis
patent: 4813146 (1989-03-01), Jaluzot

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