Image capturing optical lens assembly, image capturing device and electronic device

Patent metadata

Field	Value
Publication number	US-2017192200-A1
Application number	US-201615045344-A
Country	US
Kind code	A1
Filing date	Feb 17, 2016
Priority date	Dec 31, 2015
Publication date	Jul 6, 2017
Grant date	—

Abstract

An image capturing optical lens assembly includes, in order from an object side to an image side, a front lens group, an aperture stop and a rear lens group. The front lens group includes at least two lens elements, wherein one lens element closest to an imaged object of the at least two lens elements has negative refractive power and an image-side surface being concave. The rear lens group includes at least four lens elements, wherein one lens element closest to an image surface of the at least four lens elements has an image-side surface being concave. The image capturing optical lens assembly has a total of eight lens elements.

First claim

What is claimed is:

1 . An image capturing optical lens assembly comprising, in order from an object side to an image side:
a front lens group comprising at least two lens elements, wherein one lens element closest to an imaged object of the at least two lens elements has negative refractive power and an image-side surface being concave; an aperture stop; and a rear lens group comprising at least four lens elements, wherein one lens element closest to an image surface of the at least four lens elements has an image-side surface being concave; wherein the image capturing optical lens assembly has a total of eight lens elements, an axial distance between an object-side surface of the lens element closest to the imaged object and the image-side surface of the lens element closest to the image surface is Td, a sum of axial distances between every two of the lens elements of the image capturing optical lens assembly that are adjacent to each other is ΣAT, an effective radius of the image-side surface of the lens element closest to the image surface is Yi, a maximal image height of the image capturing optical lens assembly is ImgH, a curvature radius of the object-side surface of the lens element closest to the imaged object is R1, a curvature radius of an image-side surface of the lens element closest to the imaged object is R2, a curvature radius of the image-side surface of the lens element closest to the image surface is Ri, a focal length of the image capturing optical lens assembly is f, and the following conditions are satisfied:
5.0< Td/ΣAT;
| Yi/ImgH|< 2.0;
1.5<| R 1|/ R 2, and
0< Ri/f< 10.

2 . The image capturing optical lens assembly of claim 1 , wherein the focal length of the image capturing optical lens assembly is f, a focal length of the lens element closest to the image surface is fi, and the following condition is satisfied:
| f/fi|< 0.30.

3 . The image capturing optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the lens element closest to the imaged object and the image-side surface of the lens element closest to the image surface is Td, the sum of axial distances between every two of the lens elements of the image capturing optical lens assembly that are adjacent to each other is ΣAT, and the following condition is satisfied:
5.25< Td/ΣAT< 10.

4 . The image capturing optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the lens element closest to the imaged object and the image-side surface of the lens element closest to the image surface is Td, an axial distance between the image-side surface of the lens element closest to the image surface and the image surface is BL, and the following condition is satisfied:
3.0< Td/BL< 10.

5 . The image capturing optical lens assembly of claim 1 , wherein a maximal field of view of the image capturing optical lens assembly is FOV, an f-number of the image capturing optical lens assembly is Fno, and the following conditions are satisfied:
80 degrees<FOV; and Fno<2.40.

6 . The image capturing optical lens assembly of claim 1 , wherein the front lens group has a total of three lens elements, and the rear lens group has a total of five lens elements.

7 . The image capturing optical lens assembly of claim 6 , wherein,
the lens elements of the front lens group comprises, in order from the object side to the image side, a first lens element with negative refractive power, a second lens element with negative refractive power and a third lens element with positive refractive power; and the lens elements of the rear lens group comprises, in order from the object side to the image side, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power and an eighth lens element.

8 . The image capturing optical lens assembly of claim 1 , wherein a number of the lens elements having negative refractive power of the rear lens group is one.

9 . The image capturing optical lens assembly of claim 1 , wherein,
at least one lens element of the front lens group has an Abbe number smaller than 25; and at least one lens element of the rear lens group has an Abbe number smaller than 25.

10 . The image capturing optical lens assembly of claim 1 , wherein,
at least one lens element of the front lens group has a refractive index greater than 1.90; and at least one lens element of the rear lens group has a refractive index greater than 1.90.

11 . The image capturing optical lens assembly of claim 1 , wherein the focal length of the image capturing optical lens assembly is f, a focal length of a lens element closest to the aperture stop of the front lens group is fs1, a focal length of a lens element closest to the aperture stop of the rear lens group is fs2, and the following condition is satisfied:
0.80<( f/fs 1)+( f/fs 2)<2.0.

12 . The image capturing optical lens assembly of claim 1 , wherein an axial distance between two lens elements of the image capturing optical lens assembly which are closest to the imaged object is T12, the sum of axial distances between every two of the lens elements of the image capturing optical lens assembly that are adjacent to each other is ΣAT, and the following condition is satisfied:
0.50< T 12/Σ AT< 0.85.

13 . An image capturing device, comprising:
the image capturing optical lens assembly of claim 1 ; and an image sensor, wherein the image sensor is disposed on the image surface of the image capturing optical lens assembly.

14 . An electronic device, comprising:
the image capturing device of claim 13 .

15 . An image capturing optical lens assembly comprising, in order from an object side to an image side:
a front lens group comprising at least two lens elements, wherein one lens element closest to an imaged object of the at least two lens elements has negative refractive power and an image-side surface being concave; an aperture stop; and a rear lens group comprising at least four lens elements, wherein one lens element closest to an image surface of the at least four lens elements has an object-side surface being convex and an image-side surface being concave; wherein the image capturing optical lens assembly has a total of eight lens elements, an axial distance between an object-side surface of the lens element closest to the imaged object and the image-side surface of the lens element closest to the image surface is Td, a sum of axial distances between every two of the lens elements of the image capturing optical lens assembly that are adjacent to each other is ΣAT, an effective radius of the image-side surface of the lens element closest to the image surface is Yi, a maximal image height of the image capturing optical lens assembly is ImgH, a curvature radius of the object-side surface of the lens element closest to the imaged object is R1, a curvature radius of an image-side surface of the lens element closest to the imaged object is R2, and the following conditions are satisfied:
5.0< Td/ΣAT,
| Yi/ImgH|< 2.0; and
1.5<| R 1|/ R 2.

16 . The image capturing optical lens assembly of claim 15 , wherein a focal length of the lens element closest to the image surface is fi, and |fi| is a largest focal length in absolute value of the lens elements of the image capturing optical lens assembly.

17 . The image capturing optical lens assembly of claim 15 , wherein the axial dis

Assignees

• Largan Precision Co Ltd

Inventors

• Hsieh Tung-Yi
• Huang Hsuan-Chin
• Chen Wei-Yu

Classifications

• G02B27/0081

  with means for altering, e.g. enlarging, the entrance or exit pupil · CPC title

• G02B9/64 Primary

  having more than six components · CPC title

• G02B27/0025

  for optical correction, e.g. distorsion, aberration · CPC title

• G02B13/0045

  having five or more lenses · CPC title

• G02B13/04

  Reversed telephoto objectives · CPC title