Variable power optical system and imaging device

Details Variable power optical system and imaging device Variable power optical system and imaging device

2009-02-27

2011-11-22

Greece, James (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000, C359S691000

Reexamination Certificate

active

08064143

ABSTRACT:
A variable power optical system is provided and includes: in order from the object side, a first lens group having a negative refractive power and including a negative lens group and a positive lens group; a stop; and a second lens group having a positive refractive power and including a sub-lens group on the most object side, the sub-lens group including a first lens having a positive refractive power having at least one aspherical surface, a second lens having a positive refractive power, and a third lens having a positive refractive power. The second lens group is moved to the object side along an optical axis thereof to perform a variable power operation from a wide angle end to a telephoto end of the variable power optical system, and the first lens group is moved to make a correction of an image plane position in accordance with the variable power operation.

REFERENCES:
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patent: 8-5914 (1996-01-01), None
patent: 2005-134887 (2005-05-01), None
patent: 2006-119574 (2006-05-01), None
patent: 2007-232996 (2007-09-01), None
European Office Action corresponding to Application No. 09 002 748.3-1234 dated Apr. 14, 2011.
European Office Action corresponding to Application No. 09 002 748.3-1234 dated Jul. 8, 2010.
European Office Action corresponding to Application No. 09002748.3-2217 dated Apr. 14, 2009.
European Office Action corresponding to Application No. 09002748.3-2217 dated Jun. 3, 2009.

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