Zoom lens comprising two groups of lenses

Details Zoom lens comprising two groups of lenses Zoom lens comprising two groups of lenses

1985-09-18

1988-09-13

Corbin, John K.

G02B 15177

Patent

active

047705094

ABSTRACT:
A zoom lens comprises, in the order from the object side, a first diverging group of lenses and a second convergent group of lenses. The first and second groups of lenses are movable along the optical axis to effect zooming. The first group comprises, in the order from the object side, a negative meniscus lens having its convex surface faced to the object side, a negative lens and a positive lens having its surface of larger curvature faced to the object side. The second group of lenses comprises, in the order from the object side, a positive lens, a positive lens formed by a single lens or a combination of cemented positive and negative lenses and functioning as an achromatic lens, a negative lens having its surface of larger curvature faced to the image side and a positive lens. The zoom lens satisfies certain conditions.

REFERENCES:
patent: 4074931 (1978-02-01), Okudaira
patent: 4153338 (1979-05-01), Fujii
patent: 4155629 (1979-05-01), Nakamura
patent: 4190323 (1980-02-01), Ogawa et al.
patent: 4266860 (1981-05-01), Kayashi
patent: 4367927 (1983-01-01), Fujii
patent: 4380375 (1983-04-01), Mogami
patent: 4406523 (1983-09-01), Sato et al.
patent: 4523813 (1985-06-01), Ogata
patent: 4647160 (1987-03-01), Ikemori

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