Lens for projection, and image display device
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United States of America Patent
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Jan 9, 2018
Issued Date -
N/A
app pub date -
Oct 8, 2014
filing date -
Nov 15, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A lens for projection which is used in an image display device which includes an image display element and projects and displays an image displayed on an image display surface of the image display element as a projection image on a projected surface in an enlarged manner, the lens for projection including in order from an enlargement side to a reduction side, a first lens group which is constituted of at least eight lenses and has a positive refractive power; an aperture; and a second lens group which is constituted of less than or equal to four lenses and has a positive refractive power, wherein the first lens group includes one or more aspherical lenses, and the one or at least one aspherical lens included in the first lens group has a largest thickness at a most peripheral portion of the lens.
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