Optical: systems and elements – Lens – Single component with multiple elements
Reexamination Certificate
2007-10-30
2007-10-30
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Lens
Single component with multiple elements
C359S784000
Reexamination Certificate
active
11626440
ABSTRACT:
Provided is a zoom lens which is telecentric on a reduction side, including a plurality of lens units, in which the zoom lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?νdp>75in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?fw/fp<0.6in-line-formulae description="In-line Formulae" end="tail"?where ha indicates a height of a paraxial marginal ray passing through the zoom lens, and hb indicates a height of a paraxial chief ray passing through the zoom lens, where, among a plurality of positive lenses in the zoom lens, a positive lens whose hb/ha is the smallest is defined as a smallest positive lens in at least a part of a zoom range from a wide-angle end to a telephoto end, and where νdp indicates an Abbe constant of a material of the smallest positive lens, fp indicates a focal length of a lens unit including the smallest positive lens, and fw indicates a focal length of an entire system at the wide-angle end.
REFERENCES:
patent: 6816320 (2004-11-01), Wada
patent: 7016118 (2006-03-01), Wada
Canon Kabushiki Kaisha
Cowan Liebowitz & Latman P.C.
Thompson Timothy
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