Telecentric f-.theta. lens system

Details Telecentric f-.theta. lens system Telecentric f-.theta. lens system

1989-09-19

1990-05-15

Arnold, Bruce Y.

350465, G02B 1322

Patent

active

049252798

ABSTRACT:
The present invention is directed to a telecentric f-.theta. lens system which includes first and second lens groups. The first lens group includes: first lens set having an entrance pupil and a positive power first lens in the form of meniscus, a negative power second lens, and positive power third and fourth lenses in the form of meniscus. The second lens group includes a fifth lens having a positive power. The telecentric f-.theta. lens system therefore has a flat image surface.

REFERENCES:
patent: 1945977 (1934-02-01), Oswald

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