Zoom lens and image pickup device including the same
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United States of America Patent
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Oct 6, 2015
Grant Date -
Oct 23, 2014
app pub date -
Mar 18, 2014
filing date -
Apr 18, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A zoom lens includes, in order from an object side to an image side, first to fourth lens units having positive, negative, positive and positive refractive powers, respectively. The intervals between adjacent lens units vary during zooming. The first lens is disposed nearer to an object at the telephoto end than at the wide angle end. Each of the first lens unit to the fourth lens unit includes at least one negative lens. The lens total length Lt, the focal length ft, the mean value N2an of the refractive indices of materials of negative lenses of the second lens unit, the mean value NAan of the refractive indices of materials of the negative lenses included in the entire system, and the mean value NAap of the refractive indices of materials of the positive lenses included in the entire system are appropriately configured.
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