Zoom lens, camera, and portable information terminal device
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United States of America Patent
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May 3, 2016
Grant Date -
Aug 27, 2015
app pub date -
Feb 9, 2015
filing date -
Feb 25, 2014
priority date (Note) -
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Abstract
A zoom lens includes, in order from an object side to an image side, first, second, third, and fourth lens groups with positive, negative, negative, and positive refractive powers, respectively. When varying magnification from a short focal length end to a long focal length end, the second lens group is moved to the image side, the third lens group is moved, and the first and fourth lens groups are fixed. The fourth lens group is constituted of a lens group on the object side and a lens group on the image side with a largest distance in the fourth lens group between them. Each of a refractive index, Abbe number, a partial dispersion ratio, and the like of each of at least one positive lens of the lens group on the object side and two positive lenses of the first lens group is regulated to be in a predetermined range.
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