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...

2011-01-11

2011-01-11

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000, C359S689000, C359S690000, C359S713000, C359S714000, C359S715000, C359S716000, C359S740000, C359S785000

Reexamination Certificate

active

07869136

ABSTRACT:
In a zoom lens, in which the distance between the first lens group and the second lens group changes during zooming, wherein a refractive optical element A that has a positive refracting power if its object side surface and its image side surface are interfaces with air is provided between an object side base optical element B and an image side base optical element C to constitute therewith a three-piece cemented optical element D in the first lens group, there is at least one optical element having a positive refracting power disposed closer to the object side than the three-piece cemented optical element D, and the zoom lens satisfies a certain condition.

REFERENCES:
patent: 7505214 (2009-03-01), Hamano et al.
patent: 7643228 (2010-01-01), Ishibashi
patent: 2006-349947 (2006-12-01), None
patent: 2007-163964 (2007-06-01), None
patent: 2007-298555 (2007-11-01), None

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