Large aperture zoom lens

Details Large aperture zoom lens Large aperture zoom lens

1978-07-17

1980-12-23

Sacher, Paul A.

G02B 1518

Patent

active

042406986

ABSTRACT:
The present invention relates to a large aperture zoom lens consisting of a positive focusing lens group, a negative variator, a negative compensator, an afocal lens group and an image forming lens in sequence from the object. The focusing lens group consists of a negative meniscus lens whose convex surface is directed toward the object, a bi-convex lens and a positive meniscus lens whose convex surface is directed toward the object, the variator of a negative meniscus lens whose convex surface is directed toward the object, the bi-concave lens and a positive lens cemented with each other, the compensator representing a negative lens of a bi-concave lens and a lens cemented with each other, the negative meniscus lens in the focusing lens group is distant from the bi-convex lens so as to form are air lens with weak divergence and the compensator is moved forwards and backwards at the same time with the movement of the variator for zooming.

REFERENCES:
patent: 3512872 (1970-05-01), Lynch et al.
patent: 3918798 (1975-11-01), Takano
patent: 3997244 (1976-12-01), Takano
patent: 4066340 (1978-01-01), Besenmatter et al.

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