Zoom lens

Details Zoom lens Zoom lens

1992-02-12

1993-11-23

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

052649652

ABSTRACT:
A zoom lens comprises at least four lens groups, including a negative first lens group, positive second lens group, negative third lens group and a positive fourth lens group. When the power is varied from wide angle to telescopic, the lens groups are moved such that the distances between the first and second lens groups and between the third and fourth lens groups are reduced. The distance between the second and third lens groups is increased, and an aperture disposed near the second lens group is moved together with the second lens group.

REFERENCES:
patent: 3848967 (1974-11-01), Grey
patent: 4345821 (1982-08-01), Tachihara
patent: 4345822 (1982-08-01), Tachihara
patent: 4591235 (1986-05-01), Tokumaru et al.
patent: 4653873 (1987-03-01), Kawamura
patent: 4759617 (1988-07-01), Tokumaru et al.
patent: 4812022 (1989-03-01), Sato
patent: 4846562 (1989-07-01), Tokumaru et al.
patent: 4952039 (1990-08-01), Ito

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