Projection apparatus and projection lens with three lens groups
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United States of America Patent
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Mar 13, 2018
Issued Date -
N/A
app pub date -
Apr 21, 2016
filing date -
Apr 24, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A projection lens and a projection apparatus are provided. The projection lens has a screen side and an image side. The projection lens includes a first lens group, a second lens group, and a third lens group. The first lens group disposed between the screen side and the image side includes a first, a second, and a third lenses arranged sequentially from the screen side to the image side. The second lens group disposed between the first lens group and the image side includes a fourth, a fifth, a sixth, a seventh, an eighth, a ninth, and a tenth lenses arranged sequentially from the screen side to the image side. The third lens group disposed between the second lens group and the image side includes an eleventh and a twelfth lenses, and a distance between the twelfth lens and the light valve is a constant.
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Cited Art Landscape
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