Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

1996-01-17

1997-08-12

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359207, 359216, G02B 2608

Patent

active

056571461

ABSTRACT:
An optical scanning apparatus for scanning a light beam as a spot image on an image-forming plane apart from a light source, or reversely, for optically reading the graphic image of an object, in which stable high-resolution scanning is embodied. The apparatus includes a light source for providing a collimated beam, a cylindrical lens for linear focusing of the beam in a subscanning direction, a deflector for deflecting the beam in the main scanning direction, plastic toroidal lenses for image-forming the deflected beam and for focusing it to form a spot image, so that the three toroidal lenses have a small F.sub.No and compensate for the tilted mirror surface of the deflector, and allows stable scanning with high resolution that produces high-quality images in optical apparatus such as laser printers and facsimile machines.

REFERENCES:
patent: 3750189 (1973-07-01), Fleischer
patent: 3946150 (1976-03-01), Grafton
patent: 4379612 (1983-04-01), Matsuoka et al.
patent: 4756584 (1988-07-01), Takanashi
patent: 5136412 (1992-08-01), Makino
patent: 5245462 (1993-09-01), Kanai et al.

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