公开(公告)号：US3588245A

公开(公告)日：1971-06-28

申请号：US3588245D

申请日：1968-10-01

Applicant: BELL TELEPHONE LABOR INC

Inventor： HERRIOTT DONALD R ,  RAWSON ERIC G

IPC: G02B5/28 ,  G02B27/00 ,  G03B15/00 ,  H01L21/00 ,  G03B27/76

CPC classification number: G02B5/286 ,  G03B15/00 ,  H01L21/00

Abstract: A PLURALITY OF LENSES ARE ARRANGED ALONG AN OPTIC AXIS THROUGH WHICH LIGHT OF A SUBSTANTIALLY SINGLE FREQUENCY IS DIRECTED. A SPHERICAL INTERFERENCE FILTER IS LOCATED SYMMETRICALLY ON THE OPTICAL AXIS AND IS CAPABLE OF BEING MOVED AXIALLY OR TILTED IN ORDER TO GIVE NONUNIFOM LIGHT TRANSMISSION TO COMPENSATE FOR A LIGHT INTENSITY GRADIENT CREATED BY THE PLURALITY OF LENSES. OTHER FILTER CONFIGURATIONS ARE ALSO DESCRIBED.