Compact zoom lens

Details Compact zoom lens Compact zoom lens

1990-12-19

1991-10-22

Sugarman, Scott J.

Optical: systems and elements

Prism

With reflecting surface

359690, G02B 15177

Patent

active

050590065

ABSTRACT:
A compact zoom lens has a first lens group having a negative focal length f.sub.1 ; a second lens group having a positive focal length f.sub.2 ; and a third lens gorup having a negative focal length f.sub.3. The first, second and third lens groups are sequentially arranged from an object side of the zoom lens to an image side thereof. The first to third lens groups are moved on the object side while the mutual distances between the first, second and third lens groups are changed to perform a zooming operation from a wide angle side to a telescopic side. The third lens group is constructed by positive, negative and positive lenses sequentially arranged from the object side to the image side such that the negative and positive lenses respectively constituting the second and third lenses are joined to each other. The focal lengths f.sub.1, f.sub.2, f.sub.3 and a focal length f.sub.w of an entire lens system at a wide angle end of the zoom lens satisfy the following conditions.

REFERENCES:
patent: 4168110 (1979-09-01), Itoh
patent: 4299453 (1981-11-01), Momiyama et al.
patent: 4909613 (1990-03-01), Kikuchi

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