Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Naoaki Ide0
Date of Patent
August 5, 2008
0Patent Application Number
103917920
Date Filed
March 20, 2003
0Patent Primary Examiner
Patent 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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