Postobjective optical deflector

Details Postobjective optical deflector Postobjective optical deflector

Filed on

1992-06-25

Date issued

1993-04-20

Examiner

Arnold, Bruce Y.

Patent Class

Optical: systems and elements

SubClass

Deflection using a moving element

SubSubClass

Using a periodically moving element

Other Related Categories

359216, G02B 2608

Type

Patent

Status

active

Patent number

052047695

Description

ABSTRACT:
A postobjective optical deflector comprising: a polygonal optical deflector (polygonal rotating mirror) having a plurality of convex reflecting surfaces each being curved surface other than a spherical surface or a portion of a cylindrical surface; and a pseudocylindrical lens disposed between the polygonal optical deflector and an objective surface, having a cylindrical surface having its power in the feed direction or a rotationally symmetric surface rotationally symmetric with respect to an axis of rotational symmetry parallel to the scanning direction, and a curved surface represented by a polynomical of even degree and having its power in the scanning direction. The combined performance of the correcting effects of the polygonal optical deflector and the pseudocylindrical lens corrects the curvature of image surfaces and f.theta. characteristics at a high accuracy.

REFERENCES:
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patent: 4571035 (1986-02-01), Sakuma
patent: 4578689 (1986-03-01), Spencer et al.
patent: 4627685 (1986-12-01), Sakuma
patent: 4633272 (1986-12-01), Hardy
patent: 4651169 (1987-03-01), Muka
patent: 4866459 (1989-09-01), Tokita et al.
patent: 4875748 (1989-10-01), Matsumoto et al.
patent: 4962981 (1990-10-01), Murakami et al.
patent: 5062679 (1991-11-01), Itabashi

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