Digitizer and position encoders and calibration system for same

Details Digitizer and position encoders and calibration system for same Digitizer and position encoders and calibration system for same

1984-02-06

1986-03-11

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

33 1M, G08C 2100

Patent

active

045755817

ABSTRACT:
Digitizer incorporates two novel position encoders. One position encoder comprises means for periodic spatial calibration against an accurate pattern of reference marks, thereby improving accuracy to the limit of resolution. Optionally, it also includes temperature and humidity compensation. Superior accuracy is achieved without tight tolerance requirements for mechanical components. The same technique can be used for error detection in digital motion control.
The other position encoder, used primarily for menu data entry, is based on a discrete resistor array, combined with pulse position modulation of array columns. Its main advantage is simplicity and low cost.
The digitizer is ergonomically designed, so that the operator can digitize coordinates with the left hand while inputing from the menu with the right hand.

REFERENCES:
patent: 4317005 (1982-02-01), de Brugne

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