WIDE-ANGLE LENS

Japan Patent

APP PUB NO JP-2015034922-A
SERIAL NO

2013166339

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Abstract

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PROBLEM TO BE SOLVED: To provide a wide-angle lens which allows a first lens comprising a meniscus lens to have a shape that is easily manufactured even when a view angle of 130° or more is to be secured and offers reduced aberrations.SOLUTION: A first lens 110 of a wide-angle lens 100 has a concave surface on the image side and negative power. A second lens 120 is a negative plastic aspherical lens having a concave surface on the image side. A third lens 130 is a negative plastic aspherical lens having a concave surface on the object side. A fourth lens 140 has a convex surface on the image side and positive power. A fifth lens 150 and a sixth lens 160 are both aspherical plastic lenses and constitute a cemented lens 170 having positive power. An effective focal length f and a focal length fof the third lens 130 satisfy a relationship expressed as |f/f|<0.2.

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Patent Owner(s)

Patent OwnerAddress
NIDEC SANKYO CORPNot Provided

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Inventor(s)

Inventor Name Address
KOMIYAMA TADASHI 1555-1 KASAMA-CHO TOTSUKA-KU YOKOHAMA KANAGAWA-KEN JAPAN

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