Optical scanning system

Details Optical scanning system Optical scanning system

2005-08-23

2005-08-23

Pham, Hai (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S244000

Reexamination Certificate

active

06933961

ABSTRACT:
A multi-beam scanning optical system includes a light source, a collimating lens, a cylindrical lens, a polygon mirror, and an fθ lens system. The fθ lens system is made up of a first fθ lens whose entrance surface and exit surface have rotational symmetries, and a second fθ lens whose entrance surface has a rotational symmetry and exit surface has a rotational asymmetry. In the first fθ lens, the entrance surface is a spherical surface, and the exit surface thereof is an aspherical surface. The entrance surface of the second fθ lens is an aspherical surface, and the exit surface thereof is a toroidal surface with aspheric contour in a cross section taken along the main scanning direction. The second fθ lens is physically shaped so as to satisfy the inequity 0.9<(Le×cos θ)/Lc<1.1.

REFERENCES:
patent: 5025268 (1991-06-01), Arimoto et al.
patent: 5671079 (1997-09-01), Nagasaka et al.
patent: 5701190 (1997-12-01), Mochizuki et al.
patent: 6097421 (2000-08-01), Takeshita et al.
patent: 6104521 (2000-08-01), Iizuka

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