Image forming optical system and electronic image pickup...

Details Image forming optical system and electronic image pickup... Image forming optical system and electronic image pickup...

2009-12-07

2011-12-27

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000

Reexamination Certificate

active

08085477

ABSTRACT:
It is preferable that for an image forming optical system a basic structure which includes a first lens group having a negative refracting power, which is made of one cemented lens component, a second lens group having a positive refracting power, a third lens group having a positive refracting power, which is made of one lens component, and is movable for focusing, and a fourth lens group which is made of one lens component having an aspheric surface, and at the time of zooming from a wide angle end to a telephoto end, the second lens group moves only toward the object side, and the first lens group and the third lens group move while following a trajectory of movement different from a trajectory of movement of the second lens group is adopted, and that the image forming optical system satisfies predetermined conditional expressions.

REFERENCES:
patent: 2007/0229972 (2007-10-01), Satori
patent: 2005-266129 (2005-09-01), None
patent: 2007-156385 (2007-06-01), None
Claim set (Translated) for JP 2008-317227 (Apr. 6, 2011).

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