Facsimile and static presentation processing – Static presentation processing – Plural marking means
Reexamination Certificate
2007-06-26
2007-06-26
Garcia, Gabriel (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Plural marking means
C347S235000
Reexamination Certificate
active
10410422
ABSTRACT:
An image forming apparatus having: a plurality of scanners, each of the scanners having a rotary polygonal mirror; a position detecting section for generating an image start reference signal in a main scanning direction; a PLL control section for controlling a rotation number of the mirror on a basis of a reference frequency signal of the mirror and a pulse signal generated per one rotation of the mirror; and a phase control section for detecting phase difference of each mirror on the basis of the image start reference signal in the main scanning direction in the plurality of the scanners, controlling a phase of the reference frequency signal of each mirror, and correcting image deviation in a sub-scanning direction of an image formed by the plurality of the scanners. A control angle in which one rotation angle of the mirror is divided by a number of the pulse signal generated per one rotation of the mirror is equal to an integral multiple of a division angle in which one rotation angle of the mirror is divided by a number of mirror faces of the mirror.
REFERENCES:
patent: 6236415 (2001-05-01), Nozaki et al.
patent: 7-160084 (1995-06-01), None
Motoi Toshihiro
Nakazawa Toshihiko
Frishauf, Holtz, Goodman & Chick, PC
Garcia Gabriel
Konica Corporation
Pham Thierry L.
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