公开(公告)号：US3762793A

公开(公告)日：1973-10-02

申请号：US3762793D

申请日：1972-05-24

Applicant: AGA AB

Inventor： ULLSTIG S

IPC: G02B26/10 ,  G02B27/00 ,  G02B17/00

CPC classification number: G02B26/108 ,  G02B27/0025

Abstract: An optical compensation device precompensates optical aberrations which are not rotational-symmetrical but symmetrical in relation to two or more perpendicular, possibly equiangularly turned planes through the optical axis. Such aberrations develop in optical systems in which an optical image is being scanned in two dimensions by means of two or more prisms which during the scanning operation rotate around axes perpendicular to each other and to the optical axis. At least two cylinder lenses the axes of which coincide with the optical axis, which lenses are spaced a short distance relative to the focal length of the lenses and which are positioned symmetrically relative to the plane of symmetry of the aberrative images or one or more pairs of perpendicularly crossed lenses, both lenses in one pair having the same refractive power, the axes of which lenses coincide with the optical axis and are mutually spaced a short distance relative to the focal length of the lenses, effect the precompensation operation. One or more rotational-symmetrical lenses generate arbitrary refractive power and corrects rotational-symmetrical aberrations of the image.