Facsimile and static presentation processing – Static presentation processing – Flying dot
Reexamination Certificate
2005-06-14
2005-06-14
Poon, King Y. (Department: 2624)
Facsimile and static presentation processing
Static presentation processing
Flying dot
C359S196100, C359S206100
Reexamination Certificate
active
06906824
ABSTRACT:
A tandem type printer is provided with a plurality of scanning optical systems, a plurality of fθ lenses and photoconductive drums, which correspond to the scanning optical systems, respectively. Each scanning optical system includes a laser source and a deflector that deflects the laser beam emitted by the laser source to scan, in a main scanning direction, within a predetermined angular range. The deflected laser beam is converged by the fθ lens on the corresponding photoconductive drum and form an image. Images formed on the plurality of photoconductive drums are developed and transferred on a sheet in an overlaid fashion. Each fθ lens includes a glass lens that is burdened with substantially all the power, in the main scanning direction, of the fθ lens, and a plastic lens that is burdened with compensation for aberrations of the fθ lens. Further, a diffraction lens structure is formed to compensate for a lateral chromatic aberration of the fθ lens in the main scanning direction. Each fθ lens satisfies conditions:in-line-formulae description="In-line Formulae" end="lead"?0.0<fa/fd<0.20: andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.75<fa/fg<1.20,in-line-formulae description="In-line Formulae" end="tail"?where, fa, fd and fg represent focal lengths of the fθ lens, diffraction lens structure, and glass lens, in the main scanning direction, respectively.
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Kamikubo Junji
Koreeda Daisuke
Greenblum & Bernstein P.L.C.
PENTAX Corporation
Poon King Y.
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