Image forming apparatus which changes clock frequencies in...

Details Image forming apparatus which changes clock frequencies in... Image forming apparatus which changes clock frequencies in...

2005-01-04

2005-01-04

Pham, Hai (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S252000

Reexamination Certificate

active

06839078

ABSTRACT:
There is described a duplex image-forming apparatus having a function of forming images onto both sides of a transfer material. The apparatus includes an image-forming section to respectively form an obverse-side image and a reverse-side image on a photoreceptor element by scanning a light beam, modulated with image signals based on pixel-clock signals and reflected from a polygon mirror rotating at an operating velocity based on polygon-clock signals; a transferring section to transfer said obverse-side image and said reverse-side image onto both surfaces of said recording sheet; a fixing section to fix the images onto both surfaces of said recording sheet; and a clock-frequency changing section to change a pixel-clock frequency, and a polygon-clock frequency, corresponding to a degree of shrinkage of said recording sheet caused by a fixing operation performed in said fixing section, at a transition time of an image-forming operation from one side to another side.

REFERENCES:
patent: 6219516 (2001-04-01), Furst et al.
patent: 6628424 (2003-09-01), Sakurai
patent: 6667756 (2003-12-01), Conrow et al.

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