Image pickup lens
AssigneeKantatsu Co., Ltd.
InventorsYukio Sekine, Tomohiro Yonezawa
Life of this patent
Estimating the term…
Abstract
An imaging lens for a solid-state imaging sensor includes, in order from an object side to an image side of the imaging lens, a first through sixth lens. The first lens has positive refractive power. The second lens has positive refractive power. The third lens has negative refractive power. The fourth lens has positive or negative refractive power and aspheric surfaces facing the object side and the image side. The fifth lens has positive refractive power. The sixth lens has negative refractive power and aspheric surfaces facing the object side and the image side.
Claims20
An imaging lens for a solid-state imaging sensor, comprising, in order from an object side to an image side of the imaging lens:
- a first lens having positive refractive power;
- a second lens having positive refractive power;
- a third lens having negative refractive power;
- a fourth lens having positive or negative refractive power and aspheric surfaces facing the object side and the image side;
- a fifth lens having positive refractive power;
- and
- a sixth lens having negative refractive power and aspheric surfaces facing the object side and the image side;
- wherein conditional expressions (1), and (9) to (12) below are satisfied:
- 0.84<|r1/f| (1)
- 20<νd4<30 (9)
- 50<νd5<80 (10)
- 50<νd6<80 (11)
- 0.80<ih/f<1.1 (12)
- where
- f:
- overall focal length of the imaging lens,
- r1:
- curvature radius of an object-side surface of the first lens,
- νd4:
- Abbe number of the fourth lens at d-ray,
- νd5:
- Abbe number of the fifth lens at d-ray,
- νd6:
- Abbe number of the sixth lens at d-ray, and
- ih:
- maximum image height.
An imaging lens for a solid-state imaging sensor, comprising, in order from an object side to an image side of the imaging lens:
- a first lens having positive or negative refractive power;
- a second lens having positive refractive power and convex surfaces facing the object side and the image side;
- a third lens that is a meniscus lens having a concave surface facing the image side;
- a fourth lens that is a meniscus lens having aspheric surfaces facing the object side and the image side;
- a fifth lens;
- and
- a sixth lens having negative refractive power and aspheric surfaces facing the object side and the image side,
- wherein conditional expressions (6), (11), and (12a) below are satisfied:
- 50<νd1<80 (6)
- 50<νd6<80 (11)
- 0.85<ih/f<1.1 (12a)
- where
- νd1:
- Abbe number of the first lens at d-ray,
- νd6:
- Abbe number of the sixth lens at d-ray,
- ih:
- maximum image height, and
- f:
- overall focal length of the imaging lens.
An imaging lens for a solid-state imaging sensor, comprising, in order from an object side to an image side of the imaging lens:
- a first lens having positive refractive power;
- a second lens having positive refractive power and convex surfaces facing the object side and the image side;
- a third lens;
- a fourth lens having aspheric surfaces facing the object side and the image side;
- a fifth lens;
- and
- a sixth lens that is a meniscus lens having negative refractive power and aspheric surfaces facing the object side and the image side,
- wherein a conditional expression (12a) below is satisfied:
- 0.85<ih/f<1.1 (12a)
- where
- ih:
- maximum image height, and
- f:
- overall focal length of the imaging lens.
Dependencies are inferred from the claim text.