Optical scanning apparatus, optical writing apparatus, and...

Details Optical scanning apparatus, optical writing apparatus, and... Optical scanning apparatus, optical writing apparatus, and...

2011-01-25

2011-01-25

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S204100

Reexamination Certificate

active

07876486

ABSTRACT:
F-theta lenses, included in scanning lens systems, are arranged on a main scanning plane facing an optical deflector and substantially linearly symmetrically on the main scanning plane with reference to a rotational center of the optical deflector. Each f-theta lens has a no-power portion in the main scanning direction. Synchronization-detecting light passes through the no-power portion of the f-theta lens, thus enabling reduction in color shift due to temperature variation in an image forming apparatus without increasing the cost and complexity in controlling color shift.

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