Laser beam optical scanning device

Details Laser beam optical scanning device Laser beam optical scanning device

1993-11-04

1996-06-25

Dzierzynski, Paul M.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359212, 347261, G02B 2608

Patent

active

055305792

ABSTRACT:
A laser beam optical scanning device which has a laser diode, a collimator lens, a cylindrical lens, a polygonal scanner and an f .theta. lens. The polygonal scanner is made of resin, and when the polygonal scanner is driven to rotate, the reflective facets of the polygonal scanner are distorted to be concave or convex because of a centrifugal force. If the reflective facets are distorted to be concave with rotation of the polygonal scanner, the image surface shifts along the optical axis toward the polygonal scanner. Therefore, in this case, the elements of the optical scanning device are positioned such that the image surface is located behind a light receiving surface while the polygonal scanner is stationary and is located nearer to the light receiving surface while the polygonal scanner is rotating.

REFERENCES:
patent: 5054866 (1991-10-01), Tomita et al.
patent: 5083138 (1992-01-01), Nowak et al.

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