PROJECTION LENS ASSEMBLY AND PROJECTION APPARATUS USING THE SAME
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United States of America Patent
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Aug 27, 2015
app pub date -
Feb 12, 2015
filing date -
Feb 21, 2014
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Abstract
A projection lens assembly including a first lens group and a second lens group is provided. The first lens group has a negative dioptre and is disposed adjacent to an object side. The first lens group includes a first lens having the negative dioptre. The first lens has a first surface and a second surface opposite to each other. The first surface faces the object side. A curvature radius of the first surface is greater than or equal to 500 mm. The second lens group having a positive dioptre and is disposed adjacent to an image side. The second lens group has a third surface facing the object side. An effective focal length of the projection lens assembly is f, a distance between the second surface and the third surface is d, and a lens amount of the projection lens assembly is n, wherein d/f≧1.6 and 7≧n≧4.
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