Scanning optical system

Details Scanning optical system Scanning optical system

2005-08-30

2005-08-30

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S219200

Reexamination Certificate

active

06937376

ABSTRACT:
There is provided a scanning optical system which includes a light source, a line-like image forming optical system, a polygonal mirror, and an imaging optical system. The line-like image forming optical system forms a line-like image extending in the main scanning direction in the vicinity of a reflective surface of the polygonal mirror, and if the number of reflective surfaces of the polygonal mirror is less than or equal to six and if |m|>1.85, the following condition (1) is satisfied:in-line-formulae description="In-line Formulae" end="lead"?r<5 cos(w/2f)/[2|m|{1− cos(w/2f)}]  (1)in-line-formulae description="In-line Formulae" end="tail"?where r represents a radius of an inscribed circle of the polygonal mirror, m represents a lateral magnification of the imaging optical system in the auxiliary scanning direction, f represents a focal length of the imaging optical system in the main scanning direction, and w represents half of a scanning width.

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