Zoom lens and imaging apparatus
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United States of America Patent
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Apr 21, 2015
Grant Date -
Oct 16, 2014
app pub date -
Jun 25, 2014
filing date -
Dec 27, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens substantially consists of a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group in this order from the object side, wherein the distance between the first lens group and the second lens group increases and the distance between the second lens group and the third lens group decreases, and the distance between the third lens group and the fourth lens group decreases while changing magnification. The fourth lens group substantially consists of a positive fourth-a lens group composed of a biconvex-shape lens, a negative meniscus-shape lens, and a biconvex-shape lens and a negative fourth-b lens group composed of a positive meniscus-shape lens and a biconcave-shape lens in this order from the object side, and only the fourth-b lens group is moved toward the image side while focusing.
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