US 2017/0322391 A1Published application

Wide angle lens system and imaging device having the same

AssigneeKolen Co., Ltd.

InventorsChan Goo Kang, Jong Jin Lee, Seong Hee Bae

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Abstract

A wide angle lens system, from an object side to an image plane side, includes: a first lens having a positive refractive power; a second lens having a positive refractive power and an exit surface that is convex toward the image plane side; a third lens having a negative refractive power and an exit surface that is concave toward the image plane side; a fourth lens having a positive refractive power and an exit surface that is convex toward the image plane side; a fifth lens having a negative refractive power and an exit surface that is concave toward the image plane side; and a sixth lens having a positive refractive power. The wide angle lens system satisfies the following formulas: 75<FOV<85 2.0<Fno<2.3 where FOV is a field of view of the wide angle lens system in degrees (°) and Fno is an F-number of the wide angle lens system.

Claims20

Dependent claims

A wide angle lens system, from an object side to an image plane side, comprising:

a first lens having a positive refractive power;
a second lens having a positive refractive power and an exit surface that is convex toward the image plane side;
a third lens having a negative refractive power and an exit surface that is concave toward the image plane side;
a fourth lens having a positive refractive power and an exit surface that is convex toward the image plane side;
a fifth lens having a negative refractive power and an exit surface that is concave toward the image plane side;
and
a sixth lens having a positive refractive power, wherein the wide angle lens system satisfies Formulas 1, 2, and 3 below:
75<FOV<85 Formula 1
2.0<Fno<2.3 Formula 2
0.6<TTL/ImgH<0.8 Formula 3
where FOV refers to a field of view of the wide angle lens system in degrees (°) and Fno refers to an F-number of the wide angle lens system, and TTL refers to a distance in millimeters (mm) from a center of an entrance surface of the first lens to an image plane, and ImgH refers to a diagonal length of an effective pixel region in millimeters (mm).

8 more elements

A wide angle lens system, from an object side to an image plane side, comprising:

a first lens having a positive refractive power and an exit surface that is concave toward the image plane side;
a second lens having a positive refractive power and an exit surface that is convex toward the image plane side;
a third lens having a negative refractive power and an exit surface that is concave toward the image plane side;
a fourth lens having a positive refractive power, the fourth lens being an meniscus lens having an exit surface that is convex toward the image plane side;
a fifth lens having a negative refractive power and an exit surface that is concave toward the image plane side;
and
a sixth lens having a positive refractive power and an exit surface with at least one inflection point,
wherein the wide angle lens system satisfies Formula 1 below:
0.6<TTL/ImgH<0.8 Formula 1
where TTL refers to a distance in millimeters (mm) from a center of an entrance surface of the first lens to an image plane, and ImgH refers to a diagonal length of an effective pixel region in millimeters (mm).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/222,578Filed 28 Jul 2016
Priority: KR 10-2016-00557674 May 2016
Published: 9 Nov 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G02B 13/0045
Having at least one aspherical surface: having five or more lenses
G02B 27/0025
Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00: for optical correction, e.g. distorsion,…
G02B 9/62
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having six…
G02B
Optical elements, systems or apparatus