Zoom lens and imaging apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 5, 2015
Grant Date -
Aug 28, 2014
app pub date -
May 5, 2014
filing date -
Nov 4, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom lens includes first, second, third, and fourth lens groups respectively having positive, negative, negative, and positive powers. The first lens group includes an 11 lens group having a negative power, which is fixed during focusing operations, a lens group having a positive power, which moves during focusing operations, and a lens group having a positive power, which is fixed during focusing operations. The 11 lens group includes two negative meniscus lenses having concave surfaces toward an image side, and a cemented lens constituted by a biconcave lens toward an object side and a biconvex lens toward the image side. A distance D4 between the second meniscus lens and the cemented lens and the focal distance f1 of the first lens group satisfy the relationship: 0.60
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