公开(公告)号：US3558896A

公开(公告)日：1971-01-26

申请号：US3558896D

申请日：1968-08-29

Applicant: BELL TELEPHONE LABOR INC

Inventor： DALY JAMES C

IPC: G02B26/02 ,  H04B10/12 ,  H01J39/07 ,  G01J1/36 ,  H01J39/10

CPC classification number: G02B26/02

Abstract: In the optical guiding apparatus disclosed, the optical beam is guided and focused by solid lenses which are automatically positioned with respect to a reference axis established by the sensors. Fixed relative positioning of the sensors permits the movement of the lenses in a small number of discrete steps, each step being substantially equal to a threshold position error of a control loop. In a first embodiment, each sensor controls a plurality of beampositioning lenses collectively to provide the downstream beam position correction. two-position control and three-position control are employed. In second and third embodiments, each sensor effects compensating movements of upstream and downstream lenses to modify the beam position only locally.