Zoom lens and image pickup apparatus

Details Zoom lens and image pickup apparatus Zoom lens and image pickup apparatus

2007-03-20

2007-03-20

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

11245665

ABSTRACT:
A zoom lens includes: a first lens group with a positive refractive power; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a positive refractive power, which are arranged in this order from an object side of the zoom lens. The first lens group and the third lens group are positioned statically. The second lens group is moved for zooming the zoom lens. The fourth lens group is moved for correcting a focus movement caused by the zooming and is further moved for focusing the zoom lens. The second lens group is provided with: a negative lens in a meniscus shape; a negative lens; a positive lens; and a negative lens, which are arranged in this order from an objective side of the zoom lens.

REFERENCES:
patent: 5966245 (1999-10-01), Nagaoka
patent: 6344932 (2002-02-01), Horiuchi
patent: 6606194 (2003-08-01), Hamano et al.
patent: 7113346 (2006-09-01), Souma et al.
patent: 2005/0099700 (2005-05-01), Ohtake

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