Zoom lens system

Details Zoom lens system Zoom lens system

1991-10-28

1992-10-13

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359680, 359691, 359692, G02B 1500

Patent

active

051556294

ABSTRACT:
A zoom lens system comprising, in order from the object side, a first lens group that includes at least three lens elements and that has a negative overall power and a second lens group that includes at least four lens elements, with the negative lens element of the greatest powre being cemented to the adjacent positive lens element, and that has a positive overall power. The zoom lens system is capable of changing its focal length by adjusting the distance between the first and second lens groups. The zoom lens system satisfies the specific conditions.

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4147410 (1979-04-01), Shimomura et al.
patent: 4364641 (1982-12-01), Mogami
patent: 4380375 (1983-04-01), Mogami
patent: 4523813 (1985-06-01), Ogata
patent: 4540249 (1985-09-01), Mogami
patent: 4647160 (1987-03-01), Ikemori
patent: 4726665 (1988-02-01), Itoh
European Search Report 9107969.9-dated Jul. 19, 1991.

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