Optical scanning apparatus

Details Optical scanning apparatus Optical scanning apparatus

1994-04-06

1996-10-29

Dzierzynski, Paul M.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359196, 359205, 347256, G02B 2608

Patent

active

055702244

ABSTRACT:
An optical scanning apparatus includes: a light source for emitting a laser light ray; a cylinder lens for converting the laser light ray into a first convergent light ray that converges only in a sub-scanning direction and remains unchanged in a main scanning direction; a deflection unit for deflecting the first convergent light ray from the cylinder lens; a focusing unit for converting the deflected light ray into a second convergent light ray that converges in the main scanning direction, and for focusing the second convergent light ray on a scanned surface as a light spot; an aperture unit, arranged between the light source and the deflection unit, for blocking an outer peripheral portion of the laser light ray and for restricting a width of the laser light ray in the sub-scanning direction to a first width of an aperture of the aperture unit; and an adjusting unit for adjusting the first width of the aperture of the aperture unit so as to eliminate a deviation of the diameter of the light spot on the scanned surface from a design value.

REFERENCES:
patent: 1652271 (1921-05-01), Cooke
patent: 3537777 (1970-11-01), Flynn
patent: 4636071 (1987-01-01), Lowe et al.
patent: 4941719 (1990-07-01), Hisada et al.

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