Zoom lens system
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United States of America Patent
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Oct 31, 2017
Issued Date -
N/A
app pub date -
Apr 5, 2016
filing date -
Apr 10, 2015
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A zoom lens system including, in order from an object side to an image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves during zooming, and a third lens unit having a positive refractive power that moves during zooming. In the zoom lens system, a distance between lens units that are adjacent to each other changes during zooming, the first lens unit includes a first a-lens unit that does not move for focusing, and a first b-lens unit that moves from the image side towards the object side during focusing from an infinite object to a near object, and the first a-lens unit comprises two positive lenses and two negative lenses.
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Cited Art Landscape
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