Zoom lens

Details Zoom lens Zoom lens

2007-04-03

2007-04-03

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S685000, C359S686000

Reexamination Certificate

active

10963563

ABSTRACT:
There is provided a zoom lens capable of achieving stable optical quality even at the time of manufacture. The zoom lens includes a first lens group having positive refraction, a second lens group having negative refraction, a third lens group having positive refraction, and a fourth lens group having positive refraction, each being arrayed in this order from an object side, wherein: when a magnification changes from a wide-angle end condition having the shortest focal length to a telescopic end condition having the longest focal length, the first lens group and the third lens group are fixed in predetermined positions relative to the optical axis direction; the second lens group moves to the image side; and the fourth lens group moves to compensate fluctuation of the position of the image plane which is generated following moving of the second lens group.

REFERENCES:
patent: 5886828 (1999-03-01), Kim
patent: 62-206516 (1987-09-01), None
patent: 04-043311 (1992-02-01), None
patent: 04-361214 (1992-12-01), None
patent: 05-107473 (1993-04-01), None
patent: 06-308388 (1994-11-01), None
patent: 07-270684 (1995-10-01), None
patent: 09-281392 (1997-10-01), None
patent: 2003-228001 (2003-08-01), None
Partial EPO Search Report; Dec. 31, 2005; Application No. EP 04292569.

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