High-power zoom projection objective

Details High-power zoom projection objective High-power zoom projection objective

1977-03-31

1979-05-08

Sacher, Paul A.

G02B 1514

Patent

active

041533372

ABSTRACT:
The zoom objective includes, proceeding in order in direction from the farther to the closer conjugate of the zoom objective, a first lens group, a second lens group, and a main objective. The first lens group is convergent and consists of a cemented doublet. The second lens group is divergent and consists of a cemented doublet. The second lens group is axially shiftable. The first and second lens groups together constitute a zoom-projection-objective variator having a negative refractive power. The main objective of the zoom objective is convergent and comprises a plurality of lens elements, the two of which closest to the second lens group together form a component lens system having a positive refractive power.

REFERENCES:
patent: 4063800 (1977-12-01), Iizuka

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