公开(公告)号：US3573849A

公开(公告)日：1971-04-06

申请号：US3573849D

申请日：1969-02-04

Applicant: BELL TELEPHONE LABOR INC

Inventor： HERRIOT DONALD R ,  POOLE KENNETH M ,  ZACHARIAS ALFRED

IPC: G02B26/10 ,  B43L13/00 ,  G02B13/00 ,  G11C13/04 ,  H01L21/00 ,  H01L21/027 ,  H04N3/08 ,  G01D15/14

CPC classification number: H04N3/08 ,  G02B13/0005 ,  G11C13/048 ,  H01L21/00

Abstract: Stored data representative of a pattern or image to be reproduced modulates a writing light beam that is reflected by a rotating mirror structure to scan a photosensitive medium. A coding beam scans a code plate in synchronism with the writing beam to generate a code signal used for controlling modulation of the writing beam. A scanning lens having a nonuniform focal length is used to make the linear scan velocity of the writing beam more uniform. An interferometer may be used to drive a refracting plate in the writing beam path to compensate for errors in the movement of the photosensitive medium.