Feed-back circuit for controlling the distance between verticall

Details Feed-back circuit for controlling the distance between verticall Feed-back circuit for controlling the distance between verticall

1974-09-27

1976-04-27

Richardson, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG28, H04N 536

Patent

active

039536718

ABSTRACT:
Errors in the raster of a flying spot scanner are measured by placing a semi-reflecting surface in the path of the light to the object being scanned to form a secondary raster image in a position where such measurements can be made without interfering with the primary scanning operation. Preferably a feed-back circuit is used to control the cathode ray tube in dependence upon the measurement.

REFERENCES:
patent: 2753395 (1956-07-01), Lawrence
patent: 2892960 (1959-06-01), Nuttal
patent: 2929956 (1960-03-01), Jacobs et al.
patent: 3358184 (1967-12-01), Vitt

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