Optical scanning apparatus and image forming apparatus...

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

Reexamination Certificate

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Details

C359S212100, C359S216100, C347S232000, C347S259000

Reexamination Certificate

active

11136516

ABSTRACT:
An optical scanning apparatus in which streaks in an image or unevenness in density of an image caused by influences of dusts, scratches and toner etc on the surface of a reflecting member are unlikely to occur and excellent images can be always obtained and an image forming apparatus equipped with such an optical scanning apparatus are to be achieved. The apparatus comprises a first optical system for guiding a light beam emitted from light source unit to deflecting unit, the deflecting unit for reflecting and deflecting the light beam from the first optical system, a second optical system for guiding the light beam reflected and deflected by the deflecting unit onto a surface to be scanned through reflecting unit including n (n is an integer equal to or larger than 1) reflecting members. The apparatus satisfies the following conditions for the F-number Fnomain(mm) with respect to a main scanning cross section of an exit side of the second optical system and the smallest beam area Smin (mm2) among beam areas on reflecting surfaces of the n reflecting members on which a light beam is reflected during traveling on the optical axis of the second optical system: 70<Fnomain, and (0.004/Smin)×n<0.03.

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