Wide-angle lens
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Aug 4, 2014
filing date -
Aug 9, 2013
priority date (Note) -
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Abstract
A wide-angle lens may include a first lens having negative power; a second lens being a plastic lens having negative power, wherein at least one of an object side lens face and an image side lens face is an aspherical surface; a third lens being a plastic lens having negative power, wherein at least one of an object side lens face and an image side lens face is an aspherical surface; a fourth lens having positive power; a fifth lens being a plastic lens; a sixth lens being a plastic lens, wherein the fifth lens and the sixth lens constitute a cemented lens having positive power; and a diaphragm disposed between the fourth lens and the cemented lens. The effective focal length “f” and the focal length “f3” may satisfy the relationship: |f/f3|<0.2.
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