Document scanner

Details Document scanner Document scanner

1980-05-30

1982-02-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 358289, 358293, G01N 2130

Patent

active

043141595

ABSTRACT:
A scanner for scanning a document positioned against a backing surface to determine the position of the document includes photoelectric transducers which provide electrical scan signals in dependence upon the light reflected from the document and from the backing surface at a plurality of moving scan positions as the scan positions move across both the document and the backing surface. A recognizable background image is defined on the document backing surface such that the photoelectric transducers provide a recognizable pattern of scan signals as the document backing surface is scanned, thereby indicating the position of the document. The recognizable background pattern may include a plurality of stripes on the document backing surface with the stripes extending substantially parallel to the direction of movement of the scan positions. Alternatively, the recognizable background pattern may include a plurality of stripes which extend substantially perpendicular to the direction of movement of the scan positions. Alternate ones of the stripes may be black with intermediate ones of the stripes being white. A circuit means may be provided for detecting the recognizable pattern of the scan signals.

REFERENCES:
patent: 2220736 (1940-11-01), Stockbarger et al.
patent: 2530516 (1950-11-01), Finch
patent: 2994072 (1961-07-01), Woody
patent: 3439176 (1969-04-01), Astley et al.
patent: 3500055 (1970-03-01), Russell et al.
patent: 3684890 (1972-08-01), Hayne et al.
patent: 3793508 (1974-02-01), Maggi
patent: 4060907 (1977-12-01), Van Hook
patent: 4163157 (1979-07-01), Guignard et al.
patent: 4171744 (1979-10-01), Hubbard

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