Digital image forming apparatus having a function of compensatin

Details Digital image forming apparatus having a function of compensatin Digital image forming apparatus having a function of compensatin

1993-03-24

1996-04-30

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358296, 358406, 382319, H04N 100, H04N 104, G06K 900

Patent

active

055130186

ABSTRACT:
In a digital color copying machine that includes a control unit for automatically controlling the proper light amount of an exposure lamp, data denoting a light amount of the lamp used in the preceding copying is stored in a CPU, and a white reference plate is scanned with light from the lamp to obtain updated data which is stored in a RAM and a maximum value is calculated by an ALU. The maximum value thus calculated and a reference value are compared with each other by a comparator. Only when the maximum value is out of a range of the reference value, the light amount of the illumination lamp is changed by controlling a lamp driver. Thus, an optimum light amount of the lamp can be set in a short period of time and preparation time for copying can be reduced.

REFERENCES:
patent: 4383275 (1983-05-01), Sasaki et al.
patent: 4573787 (1986-03-01), Sanbayashi et al.
patent: 4679073 (1987-07-01), Hayashi
patent: 4760464 (1988-07-01), Sakano
patent: 4952972 (1990-08-01), Someya
patent: 5014332 (1991-05-01), Nakajima et al.
patent: 5107344 (1992-04-01), Nosaki et al.
patent: 5153745 (1992-10-01), Brandkamp et al.
patent: 5282053 (1994-01-01), Robideau
patent: 5307182 (1994-04-01), Maltz
Patent Abstracts of Japan, vol. 16, No. 542 (E-1290) 12 Nov. 1992 & JP-A-42 07 257 (Fuji Xerox Co. Ltd) 29 Jul. 1992 *abstract*.
Patent Abstracts of Japan, vol. 13, No. 18 (E-704)17 Jan. 1989 & JP-A-63 224 (Canon Inc) 19 Sep. 1988 *abstract*.

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