Pre-load apparatus and method for travelling wave digitizer

Details Pre-load apparatus and method for travelling wave digitizer Pre-load apparatus and method for travelling wave digitizer

1980-08-25

1982-02-02

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

043140963

ABSTRACT:
A digitizer propagates coarse and fine wavelength electric fields across a platen to perform phase delay measurements, the results of which correspond to a displacement of a cursor along a measurement axis. The time interval between propagating the longer wavelength coarse electric field at a high velocity and subsequently establishing and propagating a shorter wavelength fine electric field at a low velocity is minimized by pre-loading at high speed a propagation circuit with the pattern to be propagated as the shorter wavelength fine electric field.

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