Light sensitive detection system

Details Light sensitive detection system Light sensitive detection system

1974-12-20

1976-05-11

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250232, 250555, G01J 132

Patent

active

039566285

ABSTRACT:
A photoelectric detection system for a printer that is particularly useful for accurately detecting the position of type bearing or printing elements of known width and spacing as they pass a predetermined location. An output signal is generated that substantially corresponds to the light and dark periods created as the elements pass between a light source and detector. This output signal is integrated and compared with a reference signal that represents the ratio of the width of the elements to the spacing therebetween and the error is used to modify the light source and thereby adjust the output signal to accurately correspond with the dimensional criteria of the elements.

REFERENCES:
patent: 3293980 (1966-12-01), De Benedetti
patent: 3403259 (1968-09-01), Lund
patent: 3473084 (1969-10-01), Dodge
patent: 3631250 (1971-12-01), Van Buskirk
patent: 3725665 (1973-04-01), Talmo
patent: 3755687 (1973-08-01), Garnett

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