Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-03-13
2009-12-08
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
07630143
ABSTRACT:
A zoom lens comprises first, second, third and fourth lens groups in order from an object side, so as to change magnification by changing a spacing between the lens groups. The first lens group has a positive refractive power as a whole and comprises, in order from the object side, a negative meniscus lens, a reflecting member that bends an optical path nearly 90 degrees and a positive lens of a resin material having at least one aspheric surface. The second lens group has a negative refractive power as a whole and comprises a negative lens of a resin material on an most object side of the second lens group. A conditional expression given below is satisfied provided that P1is a focal length of the positive lens of the resin material in the first lens group, and P2is a focal length of the negative lens of the resin material in the second lens group.in-line-formulae description="In-line Formulae" end="lead"?1.0<|P1/P2|<3.0 (1).in-line-formulae description="In-line Formulae" end="tail"?
REFERENCES:
patent: 5513034 (1996-04-01), Sillitto et al.
patent: 7037005 (2006-05-01), Kreger et al.
patent: 2006/0082899 (2006-04-01), Kogo
patent: 2009/0027779 (2009-01-01), Sato
patent: 2000-131610 (2000-05-01), None
patent: 2006-113387 (2006-04-01), None
Birch & Stewart Kolasch & Birch, LLP
Fujinon Corporation
Spector David N
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