Photographing optical lens assembly, image capturing apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-2018059376-A1
Application number	US-201615391085-A
Country	US
Kind code	A1
Filing date	Dec 27, 2016
Priority date	Aug 23, 2016
Publication date	Mar 1, 2018
Grant date	—

Abstract

A photographing optical lens assembly includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element has an object-side surface being convex in a paraxial region thereof.

First claim

What is claimed is:

1 . A photographing optical lens assembly comprising, in order from an object side to an image side along an optical axis:
a first lens element having positive refractive power; a second lens element having negative refractive power; a third lens element having an object-side surface being convex in a paraxial region thereof; a fourth lens element; and a fifth lens element; wherein, the photographing optical lens assembly has a total of five lens elements, a central thickness of the second lens element is CT 2 , a central thickness of the fourth lens element is CT 4 , a focal length of the first lens element is f 1 , a sum of axial distances between every two of the lens elements of the photographing optical lens assembly that are adjacent to each other is ΣAT, an axial distance between an image-side surface of the fifth lens element and an image surface is BL, and the following conditions are satisfied:
0 <CT 4/ CT 2<0.58;
0< f 1/ CT 2<5.50; and
0 <ΣAT/BL< 0.68.

2 . The photographing optical lens assembly of claim 1 , wherein the fourth lens element has positive refractive power.

3 . The photographing optical lens assembly of claim 1 , wherein the third lens element has an image-side surface being concave in a paraxial region thereof.

4 . The photographing optical lens assembly of claim 1 , wherein the fifth lens element has an image-side surface being concave in a paraxial region thereof.

5 . The photographing optical lens assembly of claim 1 , wherein the focal length of the first lens element is f 1 , a focal length of the fourth lens element is f 4 , and the following condition is satisfied:
0<|f 1 /f 4 |<0.90.

6 . The photographing optical lens assembly of claim 1 , wherein a maximum optical effective radius of an object-side surface of the first lens element is Y 11 , a maximum optical effective radius of the image-side surface of the fifth lens element is Y 52 , and the following condition is satisfied:
0.55 <|Y 52/ Y 11|<1.0.

7 . The photographing optical lens assembly of claim 1 , wherein a refractive power of the first lens element is Pl, a refractive power of the second lens element is P 2 , a refractive power of the third lens element is P 3 , a refractive power of the fourth lens element is P 4 , a refractive power of the fifth lens element is P 5 , and |P 1 | and |P 2 | are two largest absolute values among |P 1 |, |P 2 |, |P 3 |, |P 4 | and |P 5 |.

8 . The photographing optical lens assembly of claim 1 , further comprising:
an aperture stop located between an imaged object and the first lens element.

9 . The photographing optical lens assembly of claim 8 , wherein a maximum optical effective radius of the image-side surface of the fifth lens element is Y 52 , an entrance pupil diameter of the photographing optical lens assembly is EPD, and the following condition is satisfied:
0.30<|(2× Y 52)/ EPD|< 1.0.

10 . The photographing optical lens assembly of claim 8 , wherein the sum of axial distances between every two of the lens elements of the photographing optical lens assembly that are adjacent to each other is ΣAT, the axial distance between the image-side surface of the fifth lens element and the image surface is BL, and the following condition is satisfied:
0<Σ AT/BL< 0.50.

11 . The photographing optical lens assembly of claim 1 , wherein at least three of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element have an Abbe number smaller than 30.0, there is an air space between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element that are adjacent to each other, and all of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are made of plastic materials.

12 . The photographing optical lens assembly of claim 1 , wherein at least one surface of at least one of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element comprises at least one inflection point, a half of a maximum field of view of the photographing optical lens assembly is HFOV, and the following condition is satisfied:
|tan(HFOV)|<0.50.

13 . The photographing optical lens assembly of claim 1 , wherein a focal length of the photographing optical lens assembly is f, a vertical distance between an inflection point closest to the optical axis on an object-side surface of the fourth lens element and the optical axis is Yc 41 , a vertical distance between an inflection point closest to the optical axis on an image-side surface of the fourth lens element and the optical axis is Yc 42 , a vertical distance between an inflection point closest to the optical axis on an object-side surface of the fifth lens element and the optical axis is Yc 51 , a vertical distance between an inflection point closest to the optical axis on the image-side surface of the fifth lens element and the optical axis is Yc 52 , and the following condition is satisfied:
0.05<(10 ×Yc 4×)/ f< 2.5 or 0.05<(10× Yc 5×)/ f< 2.5, wherein x= 1 or 2.

14 . The photographing optical lens assembly of claim 1 , further comprising:
at least one prism on the optical axis, wherein an axial distance between an object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, a sum of light path lengths on the optical axis in the at least one prism is TP, and the following condition is satisfied:
0.20< TD/TP< 2.0.

15 . A photographing optical lens assembly comprising, in order from an object side to an image side along an optical axis:
a first lens element having positive refractive power; a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof; a third lens element having an object-side surface being convex in a paraxial region thereof; a fourth lens element; and a fifth lens element; wherein the photographing optical lens assembly has a total of five lens elements, a central thickness of the second lens element is CT 2 , a central thickness of the fourth lens element is CT 4 , a focal length of the first lens element is f 1 , a focal length of the fourth lens element is f 4 , a curvature radius of the object-side surface of the second lens element is R 3 , a curvature radius of an image-side surface of the second lens element is R 4 , an axial distance between the third lens element and the fourth lens element is T 34 , an axial distance between the fourth lens element and the fifth lens element is T 45 , and the following conditions are satisfied:
0< CT 4/ CT 2<0.58;
0<| f 1/ f 4|<0.75;
−10.0<( R 3+ R 4)/( R 3− R 4)<0.20; and

0 ≦T 34/ T 45<9.50.

16 . The photographing optical lens assembly of claim 15 , wherein the third lens element has an image-side surface being concave in a paraxial region thereof.

17 . The photographing optical lens assembly of claim 15 , wherein an axial distance between the second lens element and the third lens element is T 23 , the axial distance between the third lens element and the fourth lens element is T 34 , the central thickness of the second lens element is CT 2 , and the following condition is satisfied:
0<( T 23+ T 34)/ CT 2<0.90.

18 . The photographing optical lens assembly of claim 15 , wherein an axial distance between an object-side surface of the fir

Assignees

• Largan Precision Co Ltd

Inventors

• Lin Cheng Chen
• Huang Hsin Hsuan
• Yang Shu Yun

Classifications

• G02B13/02

  Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length · CPC title

• G02B5/00

  Optical elements other than lenses (light guides G02B6/00; optical logic elements G02F3/00) · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B27/0025

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

• G02B13/0065

  having a beam-folding prism or mirror · CPC title