Image reading system

Details Image reading system Image reading system

1996-12-03

1998-12-01

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358474, 358468, 358401, H04N 104, H04N 132

Patent

active

058446958

ABSTRACT:
A scanner unit moves in the scanning direction to read an original image, and thereafter, returns to the home position. In this case, the accumulation time of a line CCD is selected to set the resolution, and a control processing unit controls the product of the LED current in the optical system and the accumulation time to always become constant, thereby stabilizing heat accumulation of the LED. During movement in the return direction, the LED current is set to be lower than that upon reading, and the average current in the two directions is controlled to become constant irrespective of the accumulation time.

REFERENCES:
patent: 4791493 (1988-12-01), Ogura et al.
patent: 4809061 (1989-02-01), Suzuki
patent: 5450215 (1995-09-01), Iwama
patent: 5495361 (1996-02-01), Cresens
patent: 5500746 (1996-03-01), Aida
patent: 5514864 (1996-05-01), Mu-Tung et al.
patent: 5568273 (1996-10-01), Sato et al.
patent: 5625470 (1997-04-01), Ueta et al.

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