Document reading apparatus with area recognizing sensor and obst

Details Document reading apparatus with area recognizing sensor and obst Document reading apparatus with area recognizing sensor and obst

1990-09-26

1993-03-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, 382 61, 340707, 340555, 358453, G01V 904, G06K 920

Patent

active

051947293

ABSTRACT:
A document reading apparatus comprising a document table, a reading section disposed above the document table for reading a document placed on the document table. The reading section includes a sensor for detecting variations of brightness within a selected reading area of the document which is designated by light beams prior to a reading operation. This apparatus further comprises a display device for displaying the image of the selected reading area.

REFERENCES:
patent: 4406530 (1983-09-01), Hasegawa et al.
patent: 4430526 (1984-02-01), Brown et al.
patent: 4471386 (1984-09-01), Tuhro
patent: 4498002 (1985-02-01), Tekirdaglis
patent: 4720750 (1988-01-01), Watanabe
patent: 4734789 (1988-03-01), Smith et al.
patent: 4907095 (1990-03-01), Komura et al.
patent: 4908716 (1990-03-01), Sakano
patent: 4965678 (1990-10-01), Yamada
patent: 5019917 (1991-05-01), Hata et al.

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