Zoom lens system for use with a compact camera having a wide cov

Details Zoom lens system for use with a compact camera having a wide cov Zoom lens system for use with a compact camera having a wide cov

1992-04-14

1992-11-10

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

051629470

ABSTRACT:
A zoom lens system for use with a compact camera is disclosed which has a wide coverage of angles and which comprises, in order from the object side, a first lens group having a positive focal length and a second lens group having a negative focal length and which performs zooming by changing the distance between the first and second lens group. The first lens group comprises, in order form the object side, a subgroup 1a having a negative focal length and a subgroup 1b having a positive focal length. The subgroup 1a is composed of at least two lens elements including a negative first lens element on the object side and a meniscus lens element on the image side which has a concave surface directed toward the object with a large curvature and a convex surface directed toward the image with a large curvature. The subgroup 1a further satisfies the following condition:

REFERENCES:
patent: 4586793 (1986-05-01), Tanaka et al.
patent: 4836660 (1989-06-01), Ito

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