Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2008-02-28
2009-06-30
Collins, Darryl J (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
07554745
ABSTRACT:
Zoom lens, using lens eccentricity to compensate for image blur, has four groups of lens pieces; 1st, 3rdand 4th, each with positive refractive power, and 2ndwith negative refractive power, arranged in series on “closer to a subject first” basis. Moving from wide to telephoto causes 1stand 2ndgroups to separate from each other, 2ndand 3rdgroups to come closer to each other, and 3rdand 4thgroups to come closer to each other. The leading subset of the 4thgroup is closest to the subject, includes lens elements of positive and negative refractive power cemented together, and serves as an anti-tremor shift lens. The zoom lens satisfies the follows:in-line-formulae description="In-line Formulae" end="lead"?1.45<f41/fw<1.8in-line-formulae description="In-line Formulae" end="tail"?where f41 is a focal length of the leading subset in the 4th lens group, and fw is a focal length of the lens optics as a whole in the wide-angle mode.
REFERENCES:
patent: 2003/0053210 (2003-03-01), Shinohara
patent: 09230235 (1997-09-01), None
patent: 2002-098895 (2002-04-01), None
patent: 2006-085155 (2006-03-01), None
Collins Darryl J
Jacobson & Holman PLLC
Tamron Co., Ltd.
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