Projection lens and projection device thereof
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Jul 26, 2016
filing date -
Aug 4, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A projection lens is applied to image projection of a projection device including an imaging unit. The projection lens includes a first lens group with a negative diopter and a second lens group with a positive diopter. The first lens group has a first lens having a first negative diopter. The second lens group is adjacent to the imaging unit and includes second, third, fourth, and fifth lenses. The second lens has a second negative diopter. The third and fourth lenses are between the first and second lenses. The fifth lens is between the imaging unit and the second lens and is an aspherical lens. A refractive index of the first lens is less than or equal to 1.64. An ABBE number of the first lens represents Vd1, an ABBE number of the second lens represents Vd2, 0.4≦Vd2/Vd1≦1.2, and Vd1<50.
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