Optical beam scanning device restraining beam position error...

Details Optical beam scanning device restraining beam position error... Optical beam scanning device restraining beam position error...

2007-07-05

2009-10-27

Allen, Stephone B (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S206100

Reexamination Certificate

active

07609430

ABSTRACT:
To provide a technique that can appropriately correct an optical characteristic according to fluctuation in an environmental temperature. An optical beam scanning device that shapes a diverging ray from a light source to be a light beam having a predetermined sectional shape in a pre-deflection optical system7including plural optical elements and deflects the light beam shaped by the pre-deflection optical system7with a polygon mirror80to cause the light beam to scan in a main scanning direction, wherein the pre-deflection optical system7has optical elements79arranged between the light source and reflecting surfaces of the polygon mirror80in a light beam traveling direction and having negative power and, among the plural optical elements forming the pre-deflection optical system7, in at least one optical element in which a principal ray of the light beam from the light source is made incident on an position of incidence different from an optical path of an optical axis of the pre-deflection optical system7in a sub-scanning direction orthogonal to the main scanning direction, a diffraction grating is formed on at least one of a plane of incidence and a plane of exit of the light beam in the optical element.

REFERENCES:
patent: 6452709 (2002-09-01), Shiraishi et al.
patent: 6493126 (2002-12-01), Iizuka
patent: 2004/0141218 (2004-07-01), Suzuki et al.
patent: 2005-221870 (2005-08-01), None
patent: 2006-154701 (2006-06-01), None
patent: 2007293182 (2007-11-01), None

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