Optical beam scanning device, image forming apparatus

Details Optical beam scanning device, image forming apparatus Optical beam scanning device, image forming apparatus

2011-08-16

2011-08-16

Pyo, Kevin (Department: 2878)

Optics: image projectors

Reflector

Plural

C359S204100, C359S216100, C399S179000, C347S243000, C250S236000

Reexamination Certificate

active

07997739

ABSTRACT:
An optical beam scanning device includes a polygon mirror80in which tilt angles with respect to a rotation axis of the polygon mirror80of respective plural reflecting surfaces are set to angles corresponding to photoconductive members associated with the respective reflecting surfaces, a post-deflection optical system A1that guides light beams reflected and deflected by the respective plural reflecting surfaces in the polygon mirror80to the photoconductive surfaces of the photoconductive members corresponding to the respective reflecting surfaces, and a pre-deflection optical system7athat shapes the light from the light source to be a light beam of a predetermined sectional shape and guides the light beam to the polygon mirror80, the pre-deflection optical system7aguiding the light from the light source to the polygon mirror80through an optical path that passes, in the main scanning direction, on an optical axis of the post-deflection optical system A1and passes, in the sub-scanning direction, a position further apart from the optical axis of the post-deflection optical system A1than all light beams after reflection and deflection guided by the post-deflection optical system A1.

REFERENCES:
patent: 7766491 (2010-08-01), Shiraishi
patent: 2009/0073531 (2009-03-01), Imai
patent: 2009/0295900 (2009-12-01), Ichii
patent: 11-218991 (1999-08-01), None
patent: 2000-002846 (2000-01-01), None

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