Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-09-29
2009-12-08
Collins, Darryl J (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S680000
Reexamination Certificate
active
07630146
ABSTRACT:
A zoom lens includes, in order from the object side thereof, a first lens unit G1having a negative refracting power and a second lens unit G2having a positive refracting power. During zooming from the wide angle end to the telephoto end, the distance between the first lens unit G1and the second lens unit G2decreases. Letting the term “lens component” refer to a lens member whose surfaces that are in contact with air on the optical axis include only two surfaces, one being an object side surface and the other being an image side surface, the first lens unit G1is comprised of a negative lens component in the form of a cemented lens having a negative refracting power that has, in order from the object side, a negative lens having a concave surface directed toward the image side and a positive lens having a convex surface directed toward the object side, and the second lens unit G2includes a lens component in the form of a cemented lens having at least one negative lens and a positive lens.
REFERENCES:
patent: 2002/0027710 (2002-03-01), Yonetani et al.
patent: 2007/0121215 (2007-05-01), Sekita
patent: 2007-155836 (2007-06-01), None
Collins Darryl J
Kenyon & Kenyon LLP
Olympus Imaging Corp.
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