Scanner apparatus and image forming apparatus including a...

Details Scanner apparatus and image forming apparatus including a... Scanner apparatus and image forming apparatus including a...

2005-12-21

2008-03-11

Allen, Stephone B. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

Reexamination Certificate

active

07342699

ABSTRACT:
A cylindrical lens is positioned between and a polygon mirror and a second slit plate through which light beams from two light beam emitting units pass, and the cylindrical lens has a thin portion where the thickness between the entrance plane and the emission plane is reduced by forming the cylindrical lens in a shape created by cutting off a surface top part of the entrance plane having a convex cross section. The light beams passed through the second slit plate pass through light converging portions provided on both sides of the thin portion of the cylindrical lens in a sub-scanning direction, and are converged on a focal point on a deflecting plane of the polygon mirror.

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