Optical lens
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United States of America Patent
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Nov 28, 2017
Grant Date -
Jun 1, 2017
app pub date -
Jun 1, 2016
filing date -
Nov 27, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An optical lens including a first lens group located between a magnified side and a minified side and a second lens group between the first lens group and the minified side is provided. The first lens group has a negative power and includes a first lens. The first lens is a plastic aspheric and meniscus lens. Besides, the first lens has a negative power and a convex surface facing the magnified side. The second lens group has a positive power and includes a second lens, a third lens having a negative power, and a fourth lens. Every two of the second, third, and fourth lenses have an air interval between these lenses. The Abbe number of each of at least three of the lenses is greater than 20. A material of at least one of the lenses is glass. At least one of the lenses is a spherical lens.
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