Optical photographing system, image capturing apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-2024255736-A1
Application number	US-202418630059-A
Country	US
Kind code	A1
Filing date	Apr 9, 2024
Priority date	Oct 5, 2016
Publication date	Aug 1, 2024
Grant date	—

Abstract

An optical photographing system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has an image-side surface being convex in a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element has an object-side surface being concave in a paraxial region thereof. The fifth lens element with positive refractive power has two surfaces being both aspheric. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the surfaces of the sixth lens element are both aspheric, and the image-side surface of the sixth lens element includes at least one convex shape in an off-axial region thereof.

First claim

What is claimed is:

1 . An optical photographing system comprising six lens elements, the six lens elements being, in order from an object side to an image side:
a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element; each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side; wherein the first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the image-side surface of the first lens element is convex in a paraxial region thereof; the object-side surface of the second lens element is convex in a paraxial region thereof; the third lens element has positive refractive power; the fifth lens element has positive refractive power, the object-side surface of the fifth lens element is concave in a paraxial region thereof, the image-side surface of the fifth lens element is convex in a paraxial region thereof; the object-side surface of the sixth lens element is convex in a paraxial region thereof, the image-side surface of the sixth lens element is concave in a paraxial region thereof, the image-side surface of the sixth lens element comprises at least one convex shape in an off-axis region thereof; wherein a central thickness of the fourth lens element is greater than an axial distance between the fifth lens element and the sixth lens element; wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and the following condition is satisfied:

(

CT
⁢
1

+

CT
⁢
2

+

CT
⁢
4

)

/

(

CT
⁢
3

+

CT
⁢
5

)

<

0.8
.

2 . The optical photographing system of claim 1 , wherein the fourth lens element has negative refractive power; the sixth lens element has negative refractive power; the central thickness of the first lens element is CT1, the central thickness of the second lens element is CT2, the central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, the central thickness of the fifth lens element is CT5, and the following condition is satisfied:

(

CT
⁢
1

+

CT
⁢
2

+

CT
⁢
4

)

/

(

CT
⁢
3

+

CT
⁢
5

)

≤

0.77
.

3 . The optical photographing system of claim 1 , wherein a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following condition is satisfied:

0.17
≤

❘
"\[LeftBracketingBar]"

f
⁢
3
/
f
⁢
2

❘
"\[RightBracketingBar]"

<

0.5
.

4 . The optical photographing system of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and the following condition is satisfied:

0.13
≤

❘
"\[LeftBracketingBar]"

R
⁢
2
/
R
⁢
1

❘
"\[RightBracketingBar]"

<

3.
.

5 . The optical photographing system of claim 1 , wherein a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the optical photographing system is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:

0.7
<

❘
"\[LeftBracketingBar]"

f
⁢
5
/
f
⁢
6

❘
"\[RightBracketingBar]"

<
1.

;
and

⁢

0.45
<

f
/
TL

<

0.7
.

6 . The optical pho

Assignees

• Largan Precision Co Ltd

Inventors

• Hsueh Chun-Che
• Tseng Yu-Tai
• Huang Hsin-Hsuan

Classifications

• G02B27/0025

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

• G02B13/04

  Reversed telephoto objectives · CPC title

• G02B9/62

  having six components only · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title