Zoom lens system, interchangeable lens apparatus and camera...

Details Zoom lens system, interchangeable lens apparatus and camera... Zoom lens system, interchangeable lens apparatus and camera...

2009-04-01

2010-10-05

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C348S240300, C359S676000

Reexamination Certificate

active

07808719

ABSTRACT:
A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; and at least three subsequent lens units, wherein the at least three subsequent lens units, in order from an object side to an image side, include: a lens unit A having positive optical power; a lens unit B having positive optical power and arranged on the image side relative to the lens unit A; and a lens unit C having negative optical power and arranged on the image side relative to the lens unit A, the lens unit C being located on the most image side, at the time of zooming, all lens units move in a direction along the optical axis so that intervals between the lens units vary, and at the time of focusing, the lens unit B moves in a direction along the optical axis.

REFERENCES:
patent: 7177092 (2007-02-01), Satori et al.
patent: 7253962 (2007-08-01), Sano
patent: 7656589 (2010-02-01), Bito et al.
patent: 2010/0033838 (2010-02-01), Saori
patent: 05-224123 (1993-09-01), None
patent: 06-123836 (1994-05-01), None
patent: 06-130330 (1994-05-01), None
patent: 06-337375 (1994-12-01), None
patent: 11-202201 (1999-07-01), None

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