Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Reexamination Certificate
2008-04-29
2008-04-29
Pham, Hai (Department: 2861)
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
Reexamination Certificate
active
11200901
ABSTRACT:
An apparatus for forming an image is disclosed which includes a scanner motor rotatably driving a polygon mirror; a laser light emitter emitting laser light; a generator detecting the laser light reflected off from the polygon mirror, thereby generating a first periodic signal; a generator detecting rotation of the scanner motor, thereby generating a second periodic signal; and a controller performing speed control of the scanner motor, based on at least one of the first and the second periodic signal. The controller makes a first determination as to whether a pre-selected one of the first and the second periodic signal is abnormal. Upon the pre-selected signal being abnormal, the controller makes a second determination as to whether a remaining one of the first and the second periodic signal is normal, and based on a result of the second determination, the controller identifies at least one failed element of the apparatus.
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patent: 5576536 (1996-11-01), Hiramatsu et al.
patent: 6064419 (2000-05-01), Uchiyama
patent: 2005/0024480 (2005-02-01), Yamazaki
patent: 10-35007 (1998-02-01), None
patent: 2003025628 (2003-01-01), None
Brother Kogyo Kabushiki Kaisha
Darby & Darby P.C.
Pham Hai
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