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US 2019/0377163 A1Published application
Imaging lens
AssigneeKantatsu Co., Ltd.
InventorsYoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Tomohiro YONEZAWA
Life of this patent
Estimating the term…
Abstract
An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens having negative refractive power, arranged in this order from an object side to an image plane side. The seventh lens is formed in a meniscus shape near an optical axis thereof. The fourth lens has a specific focal length.
Claims20
An imaging lens comprising:
- a first lens having positive refractive power;
- a second lens;
- a third lens;
- a fourth lens;
- a fifth lens;
- a sixth lens;
- and
- a seventh lens having negative refractive power, arranged in this order from an object side to an image plane side,
- wherein said seventh lens is formed in a meniscus shape near an optical axis thereof, and
- said fourth lens has a focal length f4 so that the following conditional expression is satisfied:
- 2<f4/f<15,
- where f is a focal length of a whole lens system.
9 more elements
An imaging lens comprising:
- a first lens;
- a second lens;
- a third lens;
- a fourth lens;
- a fifth lens;
- a sixth lens;
- and
- a seventh lens having negative refractive power, arranged in this order from an object side to an image plane side,
- wherein said seventh lens is formed in a meniscus shape near an optical axis thereof, and
- said first lens has an Abbe's number vd1 and said fourth lens has a focal length f4 so that the following conditional expressions are satisfied:
- 40<vd1<75,
- 2<f4/f<15,
- where f is a focal length of a whole lens system.
10 more elements
Dependencies are inferred from the claim text.