Optical: systems and elements – Lens – With variable magnification
Patent
1996-02-27
1997-11-11
Nelms, David C.
Optical: systems and elements
Lens
With variable magnification
359717, G02B 1514, G02B 1318
Patent
active
056870272
ABSTRACT:
To attain a compact wide-angle 2-unit zoom lens having a variable magnification range of 2.6 to 2.9 or thereabout which is well corrected for high optical performance throughout the entire variable magnification range with the total length shortened, the zoom lens comprises, in order from the object side, a first lens unit of positive refractive power and a second lens unit of negative refractive power, the separation between both the first and second lens units being varied to vary magnification, wherein an aspheric surface layer is formed on a lens surface of the object side among the lenses made of glass in the second lens unit by coating that lens surface with transparent resin and then setting the transparent resin.
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Canon Kabushiki Kaisha
Cornely John P.
Nelms David C.
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