Zoom lens
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United States of America Patent
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Apr 15, 2014
Grant Date -
Sep 26, 2013
app pub date -
May 15, 2013
filing date -
Nov 18, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens includes a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power arranged in this order from an object side and an aperture stop which is moved integrally with the second lens group, and performs zooming by changing a distance between the first and second lens groups and a distance between the second and third lens groups, wherein the second lens group is composed of a second group first lens having a positive power with a convex surface facing the object side, a cemented lens having a positive power as a whole, and a second group fourth lens having a negative power and at least one aspheric surface with a concave surface facing the image side arranged in this order from the object side.
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