Image reading apparatus

Details Image reading apparatus Image reading apparatus

2003-03-20

2008-08-05

Williams, Kimberly A (Department: 2625)

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

C358S463000, C358S474000

Reexamination Certificate

active

07408682

ABSTRACT:
In an image reading apparatus according to the invention, the switching frequency of a switching power supply is set to a value equal to integral multiples of a reading frequency corresponding to each line, thereby correcting, for example, uneven image density due to ripples in a power supply voltage. Further, the switching of the switching power supply is synchronized with a horizontal synchronizing signal output from a scanner, thereby causing the positions of the ripples to correspond between lines for correcting, for example, uneven image density.

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