Zoom lens system and image pickup apparatus using the same

Details Zoom lens system and image pickup apparatus using the same Zoom lens system and image pickup apparatus using the same

Filed on

2006-11-07

Date issued

2008-12-30

Examiner

Collins, Darryl J (Department: 2873)

Patent Class

Optical: systems and elements

SubClass

Lens

SubSubClass

With variable magnification

Other Related Categories

C359S689000

Type

Reexamination Certificate

Status

active

Patent number

07471459

Description

ABSTRACT:
A three-unit zoom lens system comprising, in order from an object side, a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive or negative refractive power, wherein during magnification change from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit narrows, the second lens unit and the third lens unit move toward the only object side, and a space between the second lens unit and the third lens unit changes during a focusing operation.

REFERENCES:
patent: 6191896 (2001-02-01), Itoh
patent: 6233099 (2001-05-01), Itoh
patent: 6351337 (2002-02-01), Tanaka
patent: 6611386 (2003-08-01), Tanaka
patent: 2001/0022694 (2001-09-01), Tanaka
patent: 2004/0156121 (2004-08-01), Ori et al.
patent: 2006/0221463 (2006-10-01), Enomoto

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