Facsimile and static presentation processing – Facsimile – Picture signal generator
Reexamination Certificate
2007-05-29
2007-05-29
Moe, Aung S. (Department: 2625)
Facsimile and static presentation processing
Facsimile
Picture signal generator
C358S482000, C358S483000, C382S167000, C382S154000, C359S689000, C250S201800
Reexamination Certificate
active
10331541
ABSTRACT:
Disclosed is an image reading apparatus which includes an illumination system, a reading unit, and an imaging optical system for imaging imagewise information provided on a surface of an original as illuminated by the illumination system, upon a surface of the reading unit. The imaging optical system includes, in an order from the original surface side, a first lens group of negative refractive power, a second lens group of positive refractive power, and a third lens group of negative refractive power. The image reading apparatus has a focal point position adjusting function and a focal length changing function based on movement of at least one of the lens groups of the imaging optical system. In the imaging optical system, a condition 0.01<R×K/F<1.00 is satisfied where R is resolution per single line in a main scan direction of said image reading apparatus, K is picture element size of the reading unit, and F is F number of the imaging optical system at a largest imaging magnification.
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Moe Aung S.
Worku Negussie
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