Zoom lens for projection and projection-type display apparatus
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United States of America Patent
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May 19, 2015
Grant Date -
Sep 4, 2014
app pub date -
Apr 21, 2014
filing date -
Oct 20, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom lens for projection substantially consists of a first lens-group having negative refractive-power, and which is arranged on a most magnification-side, and which is fixed during magnification change, a second lens-group having negative refractive-power, and which is arranged on a reduction-side of the first lens-group, and which is fixed during magnification change, a last lens-group having positive refractive-power, and which is arranged on a most reduction-side, and which is fixed during magnification change, and three lens-groups arranged between the last lens-group and the second lens-group, and which move during magnification change. The zoom lens is configured to be telecentric on a reduction-side, and focusing is performed by moving only the second lens-group. The lens-groups that move during magnification change are substantially a third lens-group having positive refractive-power, a fourth lens-group having positive refractive-power and a fifth lens-group having positive refractive-power, which are arranged in this order form a magnification-side.
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Family
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Cited Art Landscape
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