Scanning optical system

Details Scanning optical system Scanning optical system

2006-04-04

2006-04-04

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S207110

Reexamination Certificate

active

07023595

ABSTRACT:
In a scanning optical system, a plurality of laser beams pass through an imaging optical system and converge on surfaces to be scanned, respectively. The imaging optical system includes a scanning lens and a plurality of long lenses for the respective beams. The scanning lens has an anamorphic aspherical surface, and each long lens has at least one two-dimensional polynomial aspherical surface. A following relationship is optionally satisfied:in-line-formulae description="In-line Formulae" end="lead"?β<0.15−0.2θ/N,in-line-formulae description="In-line Formulae" end="tail"?where, β denotes an absolute value of the incident angle (rad.) of the outermost one of the plurality of laser beams incident on the reflection surface in the auxiliary scanning direction, θ denotes a half field angle (rad.) representing the maximum inclination angle of the laser beam with respect to the reference axis of the scanning lens group in the main scanning direction, and N denotes the number of surfaces of the long lenses employing the two-dimensional polynomial aspherical surface.

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