Optical scanning apparatus having tilted scanning lens system

Details Optical scanning apparatus having tilted scanning lens system Optical scanning apparatus having tilted scanning lens system

Filed on

1993-04-08

Date issued

1996-09-17

Examiner

Nelms, David C.

Patent Class

Optical: systems and elements

SubClass

Deflection using a moving element

SubSubClass

Using a periodically moving element

Other Related Categories

359217, 250236, G02B 2608

Type

Patent

Status

active

Patent number

055574467

Description

ABSTRACT:
In an optical scanning apparatus, there are arranged a light source, a first optical system for converting a light beam emitted from the light source to a convergent light beam, a deflector for deflecting the convergent light beam from the first optical system, and a second optical system for image-forming the convergent light beam deflected by the deflector as a spot on a surface to be scanned. The symmetrical axis of the second optical system with respect to a main-scanning direction is disposed so as to have an inclination relative to a normal to the scanned surface in a main-scan cross section. As a result, aberrations of the optical scanning apparatus, especially degradation of f.theta. characteristics due to backward and forward movement of a mirror surface caused by the rotation of the polygon mirror, which occur in an optical scanning system wherein a convergent, light beam is caused to enter the polygon mirror, are reduced.

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patent: 4863227 (1989-09-01), Takanashi
patent: 5064260 (1991-11-01), Shiraishi
patent: 5095383 (1992-03-01), Omura et al.
patent: 5111219 (1992-05-01), Makino
patent: 5162938 (1992-11-01), Iima et al.
patent: 5179465 (1993-01-01), Kondo
patent: 5189546 (1993-02-01), Iizuka

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