Optical scanning unit

Details Optical scanning unit Optical scanning unit

2004-11-10

2008-10-28

Cherry, Euncha P (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

07443559

ABSTRACT:
An optical scanning unit including: a light source which produces and emits a beam; a beam deflector which deflects and scans the beam in a main scanning direction of an exposed object; and an f-θ lens which corrects the beam deflected by the beam deflector at different magnifications for the main scanning direction than for a subscanning direction so that a corrected beam is focused onto the exposed object. When H is an entire length in the main scanning direction of the beam focused onto the exposed object and L is an axial distance between a reflection face of the beam deflector and the exposed object, the relationship of H and L satisfies an expression0.25≤H2·L≤1.75.

REFERENCES:
patent: 5808773 (1998-09-01), Ono
patent: 6069724 (2000-05-01), Hayashi et al.
patent: 63-80218 (1988-04-01), None
patent: 02-171715 (1990-07-01), None
patent: 10-003051 (1998-01-01), None
patent: 2001-142019 (2001-05-01), None

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