Variable power optical system and imaging device

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

2011-03-15

2011-03-15

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S685000

Reexamination Certificate

active

07907351

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 includes a sub-lens group having a positive refractive power as a whole and arranged 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 negative 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 to perform a variable power operation from the wide angle end to the telephoto end with moving the first lens group to make a correction of an image plane position.

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Extended European Search Report mailed Jun. 3, 2009 for corresponding European application No. 09002749-1.

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