Optical imaging module, image capturing apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-2019250380-A1
Application number	US-201916394168-A
Country	US
Kind code	A1
Filing date	Apr 25, 2019
Priority date	Oct 14, 2016
Publication date	Aug 15, 2019
Grant date	—

Abstract

An optical imaging module includes 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. The first lens element has negative refractive power. The second lens element has an image-side surface being concave. The third lens element has an image-side surface being convex. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power has an object-side surface being concave and an image-side surface being convex. The sixth lens element has an image-side surface being concave, wherein an object-side surface and the image-side surface of the sixth lens element are both aspheric, and the image-side surface of the sixth lens element includes at least one inflection point.

First claim

What is claimed is:

1 . An optical imaging module 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; wherein each of the six lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side; wherein the first lens element has negative refractive power, the image-side surface of the first lens element is concave in a paraxial region thereof, the second lens element has positive refractive power, the object-side surface of the second 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, and the image-side surface of the sixth lens element is concave in a paraxial region thereof and comprises at least one inflection point; wherein a maximum value among refractive indices of the six lens elements is Nmax, an axial distance between the second lens element and the third lens element is T23, an axial distance between the fifth lens element and the sixth lens element is T56, and the following conditions are satisfied:
1.66≤ N max<1.72; and

0.11≤ T 56/ T 23≤1.12.

2 . The optical imaging module of claim 1 , wherein the image-side surface of the second lens element is concave in a paraxial region thereof.

3 . The optical imaging module of claim 1 , wherein the image-side surface of the fourth lens element is convex in a paraxial region thereof, a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, and the following condition is satisfied:
f 4/ f 1<−0.20.

4 . The optical imaging module of claim 1 , further comprising:
an aperture stop disposed between the second lens element and the third lens element; wherein a vertical distance between a critical point in an off-axis region on the image-side surface of the sixth lens element and an optical axis is Yc62, a focal length of the optical imaging module is f, and the following condition is satisfied:
0.50< Yc 62/ f< 1.0.

5 . The optical imaging module of claim 1 , wherein the axial distance between the second lens element and the third lens element is T23, the axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:
0.11≤ T 56/ T 23<0.80.

6 . The optical imaging module of claim 1 , wherein a half of a maximum field of view of the optical imaging module is HFOV, an f-number of the optical imaging module is Fno, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the optical imaging module is ImgH, and the following conditions are satisfied:
1.20<tan(HFOV)<6.0; 1.40<Fno<2.80; and 1.50< TL /Img H <2.50.

7 . An optical imaging module 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; wherein each of the six lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side; wherein the first lens element has negative refractive power, the second lens element has positive refractive power, the object-side surface of the second 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, and the image-side surface of the sixth lens element is concave in a paraxial region thereof and comprises at least one inflection point; wherein an axial distance between the second lens element and the third lens element is larger than an axial distance between the fifth lens element and the sixth lens element, a maximum value among refractive indices of the six lens elements is Nmax, an f-number of the optical imaging module is Fno, and the following conditions are satisfied:
1.66≤ N max<1.72; and

1.40<Fno≤2.39.

8 . The optical imaging module of claim 7 , wherein the fourth lens element has positive refractive power, and the fifth lens element has negative refractive power.

9 . The optical imaging module of claim 7 , wherein the object-side surface of the first lens element is concave in a paraxial region thereof.

10 . The optical imaging module of claim 7 , wherein the image-side surface of the first lens element is concave in a paraxial region thereof, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the optical imaging module is f, and the following condition is satisfied:
2.0< TL/f< 3.0.

11 . The optical imaging module of claim 7 , wherein the object-side surface of the fourth lens element is convex in a paraxial region thereof, an axial distance between the first lens element and the second lens element is T12, the axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, the axial distance between the fifth lens element and the sixth lens element is T56, and the following condition is satisfied:
( T 12+ T 56)/( T 23+ T 34+ T 45)<3.0.

12 . The optical imaging module of claim 7 , wherein at least one of the object-side surface and the image-side surface of the first lens element comprises at least one inflection point, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the optical imaging module is ImgH, and the following condition is satisfied:
TL /Img H <3.50.

13 . The optical imaging module of claim 7 , wherein the f-number of the optical imaging module is Fno, and the following condition is satisfied:
1.40<Fno≤2.27.

14 . The optical imaging module of claim 7 , wherein a distortion percentage on a maximum image height of the optical imaging module is DST1.0, a maximum field of view of the optical imaging module is FOV, and the following condition is satisfied:
|DST1.0/FOV|<0.25(%/degrees).

15 . An image capturing apparatus, comprising:
the optical imaging module of claim 7 ; a driving unit for driving the optical imaging module; and an image sensor, wherein the image sensor is disposed on an image surface of the optical imaging module.

16 . An electronic device, comprising:
the image capturing apparatus of claim 15 ; and an imaging lens apparatus, wherein a maximum field of view of the imaging lens apparatus is smaller than a maximum field of view of the optical imaging module.

17 . An optical imaging module 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; wherein each of the six lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side; wherein the first lens element has negative refractive power, the second lens element has positive refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the object-side surface of the fourth lens e

Assignees

• Largan Precision Co Ltd

Inventors

• Lin Cheng-Chen
• Chen Chun-Yen
• Tseng Yu-Tai
• Yeh Kuan-Ting
• Huang Hsin-Hsuan

Classifications

• H04N23/55

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

• G02B27/0025

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

• G02B13/04

  Reversed telephoto objectives · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title