Imaging lens and imaging device

Patent metadata

Field	Value
Publication number	US-2022019059-A1
Application number	US-201917309718-A
Country	US
Kind code	A1
Filing date	Nov 25, 2019
Priority date	Dec 26, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

To achieve high performance. A first lens having a positive refractive power with a convex surface facing an object side, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power or a negative refractive power with a concave surface facing the object side, a fifth lens having a positive refractive power or a negative refractive power, a sixth lens having a positive refractive power with a concave surface facing an image side, and a seventh lens having a negative refractive power in the vicinity of an optical axis, a surface on the image side of which is formed into an aspherical shape having an inflection point are provided in order from the object side to the image side.

First claim

1 . An imaging lens comprising:
a first lens having a positive refractive power with a convex surface facing an object side; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power or a negative refractive power with a concave surface facing the object side; a fifth lens having a positive refractive power or a negative refractive power; a sixth lens having a positive refractive power with a concave surface facing an image side; and a seventh lens having a negative refractive power in a vicinity of an optical axis, a surface on the image side of which is formed into an aspherical shape having an inflection point, in order from the object side to the image side.

2 . The imaging lens according to claim 1 that satisfies following conditional expression (1):
1.0< f 1/ f< 225.0  (1)

where f is a focal length of an entire system, and f1 is a focal length of the first lens.

3 . The imaging lens according to claim 1 that satisfies following conditional expression (2):
0.7< f 2/ f< 4.0  (2)

where f is a focal length of an entire system, and f2 is a focal length of the second lens.

4 . The imaging lens according to claim 1 that satisfies following conditional expression (3):
4.0<| f 45|/ f   (3)

where f is a focal length of an entire system, and f45 is a composite focal length of the fourth and fifth lenses.

5 . The imaging lens according to claim 1 that satisfies following conditional expression (4):
2.8< f 6/ f< 215.0  (4)

where f is a focal length of an entire system, and f6 is a focal length of the sixth lens.

6 . The imaging lens according to claim 1 that satisfies following conditional expression (5):
−46.0< f 6/ f 7<−0.3  (5)

where f6 is a focal length of the sixth lens, and f7 is a focal length of the seventh lens.

7 . The imaging lens according to claim 1 that satisfies following conditional expression (6):
5.4<| R 7/ f|< 220.0  (6)

where f is a focal length of an entire system, and R7 is a curvature radius of a surface on the object side of the fourth lens.

8 . The imaging lens according to claim 1 that satisfies following conditional expression (7):
5.8<|( R 11+ R 12)/( R 11− R 12)|<320.0  (7)

where R11 is a curvature radius of a surface on the object side of the sixth lens, and R12 is a curvature radius of a surface on the image side of the sixth lens.

9 . The imaging lens according to claim 1 that satisfies following conditional expression (8):
18.0<ν d ( L 3)<ν d ( L 5)<ν d ( L 6)<30.0  (8)

where νd(L 3 ) is an Abbe number on a d-line of the third lens, νd(L 5 ) is an Abbe number on a d-line of the fifth lens, and νd(L 6 ) is an Abbe number on a d-line of the sixth lens.

10 . The imaging lens according to claim 1 , wherein
an aperture diaphragm is arranged on the object side of the first lens or between the first lens and the second lens.

11 . The imaging lens according to claim 1 , wherein
the sixth lens has an inflection point on a surface on the image side.

12 . An imaging device comprising:
an imaging lens and an imaging element that converts an optical image formed by the imaging lens into an electric signal, wherein the imaging lens is provided with: a first lens having a positive refractive power with a convex surface facing an object side; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power or a negative refractive power with a concave surface facing the object side; a fifth lens having a positive refractive power or a negative refractive power; a sixth lens having a positive refractive power with a concave surface facing an image side; and a seventh lens having a negative refractive power in a vicinity of an optical axis, a surface on the image side of which is formed into an aspherical shape having an inflection point, in order from the object side to the image side.

Assignees

• Sony Group Corp

Inventors

• Kamebuchi Kenta
• Taniyama Minoru
• Nihei Yasuhide

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B15/1461

  the first group being positive · CPC title

• G02B27/0012

  Optical design, e.g. procedures, algorithms, optimisation routines · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title