Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Reexamination Certificate
2005-07-05
2005-07-05
Nguyen, Lamson (Department: 2853)
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
Reexamination Certificate
active
06914620
ABSTRACT:
It is an object of the present invention to provide a multi-beam scanning optical system, which can reduce relative deviation of a writing position of each light-emitting portion due to focus deviation of a synchronization detection optical device, and an image forming apparatus using the same. In the multi-beam scanning optical system having the synchronization detection optical device including a light source device, an incident optical device, a deflection device, a scanning optical device and a slit, each element is set such that relative deviation of a writing position of each light beam due to deviation of a focus position within a main scanning cross section is reduced by a first light beam limiting element provided between the deflection device and the slit and a conditional expression is satisfied.
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Ishibe Yoshihiro
Ishihara Keiichiro
Yoshida Hiroki
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Mouttet Blaise
Nguyen Lamson
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