Image pickup optical system and image pickup apparatus

Details Image pickup optical system and image pickup apparatus Image pickup optical system and image pickup apparatus

2007-03-19

2008-08-26

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S774000

Reexamination Certificate

active

07417801

ABSTRACT:
An image pickup optical system according to the present invention includes: a first lens group having a positive power; a second lens group having a negative power; a third lens group having a positive power; and a fourth lens group having a positive power which consists of a front group with a negative power and a rear group with a positive power. The first lens group moves to the object side and a distance between each neighboring lens groups changes, for varying power of the image pickup optical system. One group of the front group and the rear group in the fourth lens group consists of one lens which moves substantially perpendicular to an optical axis for a shake compensation. The image pickup optical system fulfills the predetermined conditional formula according to a focal length of the first lens group.

REFERENCES:
patent: 6989942 (2006-01-01), Nurishi
patent: 7173769 (2007-02-01), Park
patent: 7-92431 (1995-04-01), None
patent: 2001-100099 (2001-04-01), None
patent: 2002-98895 (2002-04-01), None

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