Compact wide-angle zoom lens

Details Compact wide-angle zoom lens Compact wide-angle zoom lens

1997-07-08

1999-05-04

Gray, David M.

Photography

Having variable focal length of camera objective

359689, G02B 1514, G03B 1700

Patent

active

058995854

ABSTRACT:
A zoom lens having, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power and a third lens unit of negative refractive power, the first lens unit and the second lens unit being axially moved to effect zooming, wherein the first lens unit comprises, in order from the object side to the image side, a positive first lens, a negative second lens of meniscus form having a strong concave surface facing the image side, a negative third lens of bi-concave form and a positive fourth lens of meniscus form having a convex surface facing the object side, and the third lens unit comprises, in order from the object side to the image side, a negative first lens of bi-concave form and a positive second lens, and wherein the zoom lens satisfies the following conditions:

REFERENCES:
patent: 4871243 (1989-10-01), Ogawa et al.
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5241421 (1993-08-01), Endo et al.
patent: 5528427 (1996-06-01), Tanaka et al.
patent: 5537259 (1996-07-01), Ogawa
patent: 5568321 (1996-10-01), Ogawa et al.
patent: 5576890 (1996-11-01), Tanaka et al.

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