Image reading apparatus

Details Image reading apparatus Image reading apparatus

2005-12-06

2005-12-06

Lee, Cheukfan (Department: 2622)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C358S406000, C358S412000, C358S474000, C358S483000, C358S486000, C358S497000, C358S409000, C358S504000, C358S505000, C358S442000, C358S404000, C318S685000, C318S696000

Reexamination Certificate

active

06972876

ABSTRACT:
The invention provides an image reading apparatus that produces a precise image of an original document to prevent the read image from having distortion or irregular density, by driving a DC motor, which drives an image reading unit in a scanning direction, at a constant speed suitable for a document to be read. In addition, the image reading apparatus prevents position errors or misalignment at the start of the image reading, or at a restart of the image reading after the image reading is paused. A speed control circuit provides feedback to a DC motor to synchronize a time interval detected by a pulse interval detecting circuit with a time interval set by an interval setting register, so that the DC motor is operated at a constant speed. A counter counts the number of signals output from an encoder. After the speed of the DC motor is stabilized, a timing of signals output from a CCD drive unit to the image reading unit is synchronized with a timing of the signals generated by the encoder. As a count in the counter reaches a predetermined number, an actual image reading is started. Thus, the position errors or misalignment are prevented in the produced image.

REFERENCES:
patent: 5177626 (1993-01-01), Nosaki et al.
patent: 6115149 (2000-09-01), Lai et al.
patent: 6335807 (2002-01-01), Neale et al.
patent: 6459507 (2002-10-01), Wang et al.
patent: 7-79405 (1995-08-01), None
patent: 2001127965 (2001-05-01), None

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