Scanning optical system

Details Scanning optical system Scanning optical system

1987-09-14

1989-02-07

Corbin, John K.

350432, G02B 2610, G02B 1318

Patent

active

048027219

ABSTRACT:
In a scanning optical system for deflecting a laser beam by a deflector to converge it on a scanning surface by a focusing lens, it is difficult to compensate for both an image surface curvature and a distortion aberration in the optical system. An optical system according to the present invention is designed to minimize a curvature of a meridional image surface of a focusing lens, and a sagittal image surface and distortion are compensated for by arranging an aspherical surface between the focusing lens and the scanning surface. This aspherical surface is advantageously arranged by forming a cylindrical lens, which is inserted to compensate for a tilting of the deflected surface, into an aspherical surface.

REFERENCES:
patent: 4253724 (1981-03-01), Minoura et al.
patent: 4379612 (1983-04-01), Matsuoka et al.
patent: 4523801 (1985-07-01), Baba et al.
patent: 4571035 (1986-02-01), Sakuma

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