Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-09-13
2005-09-13
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S682000, C359S685000
Reexamination Certificate
active
06943960
ABSTRACT:
A three-group zoom lens includes first, second, and third lens groups, of negative, positive, and positive or negative refractive power, respectively. The second lens group includes a stop and the third lens group moves for focusing. When zooming from the wide-angle end to the telephoto end, the first and second lens groups become closer together. The zoom lens preferably satisfies specified conditions that ensure compactness, ease of manufacture, and favorable correction of aberrations. The zoom lens includes aspheric lens elements with lens surfaces defined by an aspheric lens equation that: (a) includes at least one non-zero coefficient of an even power of Y, and at least one non-zero coefficient of an odd power of Y, where Y is the distance of a point on the aspheric lens surface from the optical axis, and/or (b) includes at least one non-zero coefficient of Yi, where i is even and 16 or greater.
REFERENCES:
patent: 6351337 (2002-02-01), Tanaka
patent: 6661584 (2003-12-01), Nishimura
patent: 2005/0057816 (2005-03-01), Sato
patent: 2005/0057817 (2005-03-01), Ori
patent: 2005/0057818 (2005-03-01), Sato
patent: 2005/0057821 (2005-03-01), Sato
patent: 2000-284177 (2000-10-01), None
Ori Tetsuya
Yamagami Ryoko
Arnold Bruce Y.
Arnold International
Fujinon Corporation
Henry Jon W.
Spector David N.
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