Image reading device used in a facsimile machine

Details Image reading device used in a facsimile machine Image reading device used in a facsimile machine

1995-05-15

1998-04-28

Vu, Kim

Facsimile and static presentation processing

Facsimile

Synchronization

358486, 358474, 358496, 358494, H04N 136, H04N 104

Patent

active

057452547

ABSTRACT:
In an image reading device, an image scanner reads data by scanning a document at a fixed speed in a main scanning direction, and a stepping motor feeds the document in an auxiliary scanning direction. In a through-up drive of the stepping motor, the rotational speed of the motor is increased in stepwise manner up to a rated high speed. Before the rotational speed of the motor reaches the rated high speed, the number of lines that the document is fed does not agree to the number of lines scanned by the image scanner. To effectively use the scanned data and to obtain good image, a number of blocks of line data equal to a number of lines fed by the stepping motor when the motor feeds the document at a speed slower than the rated speed is produced by using all of blocks of line data produced from the image scanner during feeding of the document at the slow speed.

REFERENCES:
patent: 4291339 (1981-09-01), Osawa et al.
patent: 5444555 (1995-08-01), Ono
patent: 5517331 (1996-05-01), Murai et al.
patent: 5530562 (1996-06-01), Eisenbarth et al.

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