Scanning optical system

Details Scanning optical system Scanning optical system

Filed on

1984-10-30

Date issued

1987-06-23

Examiner

Corbin, John K.

Other Related Categories

350 65, G02B 2610

Type

Patent

Status

active

Patent number

046748253

Description

ABSTRACT:
The scanning optical system of this invention has a light source, a first focussing optical system linearly focussing a light beam coming from the light source, a deflector having its deflecting-reflection surface in the vicinity of the focussing image, and a second focussing optical system for focussing the light beam deflected by the deflector on a medium to be scanned. The second focussing optical system has a spherical single lens having negative refractive power, a spherical single lens having positive refractive power and a single lens having a toric surface. By this arrangement, a focussing spot having a small diameter in the main scanning direction and having a well compensated curvature of field and distortion can be formed on the medium to be scanned.

REFERENCES:
patent: 4390235 (1983-06-01), Minoura
patent: 4401362 (1983-08-01), Maeda
patent: 4447112 (1984-05-01), Matsuoka et al.

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