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

2007-03-30

2008-10-28

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S208100, C347S259000

Reexamination Certificate

active

07443557

ABSTRACT:
An image forming apparatus provided with an optical beam scanning apparatus according to the invention includes a semiconductor laser device, a pre-deflection optical system, a polygon mirror, and a post-deflection optical system, wherein at least one imaging lens for imaging the luminous flux is provided in the post-deflection optical system includes; at least one projection on a vertical surface to a sub-scanning direction axis is provided in the imaging lens; and at least one positioning member having an engaging groove into which the projection is interfitted and which is engaged in a concave-convex shape is provided in the housing unit of the optical beam scanning apparatus. In accordance with an image forming apparatus according to the invention, in a scanning optical system using an imaging lens or an imaging mirror, influences against optical characteristics following an environmental fluctuation or a change with time can be reduced.

REFERENCES:
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Beiser, Laser Scanning Notebook, LSN-8-11/91, The Polygon Scanner, 1992.

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