Optical beam scanning apparatus and image forming apparatus

Details Optical beam scanning apparatus and image forming apparatus Optical beam scanning apparatus and image forming apparatus

2008-05-01

2011-12-20

Doak, Jennifer L. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C250S559290

Reexamination Certificate

active

08081363

ABSTRACT:
An optical beam scanning apparatus and an image forming apparatus having the optical beam scanning apparatus are provided. The optical beam scanning apparatus includes a light source; a pre-deflection optical system; an optical beam deflecting device; a sensor; and a post-deflection optical system. An exit surface of the imaging lens includes a lens-shaped portion for imaging the light flux on a scanned surface of the scanned object, and a totally reflecting surface-shaped portion having a totally reflecting surface for totally reflecting a portion of the light flux from the deflecting surface of the optical beam deflecting device at least two times, and the incident surface of the imaging lens includes a transmission surface-shaped portion having a transmission surface for transmitting the light flux totally reflected by the totally reflecting surface, and the light flux transmitted through the transmission surface is directed to the sensor.

REFERENCES:
patent: 6831764 (2004-12-01), Shimomura et al.
patent: 2006/0187513 (2006-08-01), Ohsugi
patent: H06-003610 (1994-01-01), None
patent: 06-003610 (1994-06-01), None
patent: H09-101471 (1997-04-01), None
patent: H09-203872 (1997-08-01), None
patent: H09-243941 (1997-09-01), None

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