Image reading apparatus capable of detecting paper size

Details Image reading apparatus capable of detecting paper size Image reading apparatus capable of detecting paper size

1990-04-27

1994-07-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358451, 358452, 358453, 358488, 358494, 355 75, H04N 140, H04N 1387

Patent

active

053272617

ABSTRACT:
An image reading apparatus includes an original placing platen formed of a rectangular transparent member on which an original is placed; a photoelectrical conversion device for reading an image of the original-placed on the transparent member; an original pressing plate having an original pressing surface for pressing the overall surface of the original placing platen, the original pressing surface having a first area formed at a portion opposing a first side of the transparent member and a second area formed at a portion opposing a second side crossing at a right angle to the first side of the transparent member. The first and second areas are determined as a predetermined color by the photoelectrical conversion device. The apparatus further includes a size detecting device for reading by the photoelectrical conversion device the original sandwiched between the first and second areas of the original pressing surface and the transparent member so as to detect the size of the original based on the result of reading.

REFERENCES:
patent: 3695760 (1972-10-01), Orr
patent: 4630127 (1986-12-01), Fuwa
patent: 4698511 (1987-10-01), Sueda et al.
patent: 4802229 (1989-01-01), Yamada
patent: 4899227 (1990-02-01), Yamada

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