Projection lens unit for pico-projector
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United States of America Patent
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Apr 8, 2014
Grant Date -
Jul 5, 2012
app pub date -
May 18, 2011
filing date -
Dec 30, 2010
priority date (Note) -
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Abstract
A projection lens unit for a pica-projector includes a plurality of plastic lenses and a single glass lens to minimize a change in focal length due to the heat generated inside the pico-projector. The lens array includes:
- a 1st lens with negative (−) refractive power, a 2nd lens with positive (+) refractive power, a 3rd fens with negative (−) refractive power, a 4th lens with negative (−) refractive power, and a 5th lens with positive (+) refractive power, wherein the 1st to 5th lenses are arranged in order from a screen upon which an image is projected, the 1st to 4th lenses are plastic lenses and the 5th lens is a glass lens.
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