Reflective scanning optical system

Details Reflective scanning optical system Reflective scanning optical system

2006-02-14

2006-02-14

Cherry, Euncha P. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

06999216

ABSTRACT:
There is provided a reflective scanning optical system, which includes a light source unit for emitting a beam, a polygon mirror, and a single fθ optical element. Magnification mzof the fθ optical element in an auxiliary scanning direction is set to satisfy: −4<mz<−2 . . . (1). The light source unit is set so that a central axis of the beam incident upon the polygon mirror from the light source unit will be in a plane orthogonal to the rotation axis of the polygon mirror and out of an effective scan range of the beam dynamically deflected by the polygon mirror in regard to a main scanning direction. Each reflecting surface of the polygon mirror and the scan target surface are optically conjugate with each other in regard to the auxiliary scanning direction. The beam incident upon the first surface of the fθ optical element and the beam emerging from the first surface are separated from each other in the auxiliary scanning direction.

REFERENCES:
patent: 5805324 (1998-09-01), Endou
patent: 5963355 (1999-10-01), Iizuka
patent: 2003/0123118 (2003-07-01), Iizuka
patent: 9-68664 (1997-03-01), None
patent: 11-242178 (1999-09-01), None
patent: 2004-13109 (2004-01-01), None
patent: 2004-13110 (2004-01-01), None
patent: 2004-13111 (2004-01-01), None
English Language Abstract of JP 2004-13109.
English Language Abstract of JP 2004-13110.
English Language Abstract of JP 2004-13111.

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