Telecentric projection lens system

Details Telecentric projection lens system Telecentric projection lens system

1998-02-24

1999-05-18

Nelms, David

Optical: systems and elements

Lens

Telecentric system

359690, 359649, 359651, G02B13/22;15/14;3/00

Patent

active

059055960

ABSTRACT:
A telecentric projection lens system comprises, in order from the magnifying side to the reducing side, a positive power first lens group including, in order from the magnifying side, at least first and second concave meniscus lens elements and one cemented lens element, a negative power second lens group comprising a concave lens element and a convex meniscus lens element, and a positive power third lens group, and satisfies the following conditions:

REFERENCES:
patent: 4189211 (1980-02-01), Taylor
patent: 4249805 (1981-02-01), Hilbert et al.
patent: 5625495 (1997-04-01), Moskovich

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