Imaging lens assembly, image capturing apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-2018024322-A1
Application number	US-201615280138-A
Country	US
Kind code	A1
Filing date	Sep 29, 2016
Priority date	Jul 19, 2016
Publication date	Jan 25, 2018
Grant date	—

Abstract

An imaging lens assembly 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 third lens element has positive refractive power. The fifth lens element has both an object-side surface and an image-side surface being aspheric. The sixth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof, wherein an object-side surface and the image-side surface of the sixth lens element are aspheric.

First claim

What is claimed is:

1 . An imaging lens assembly comprising, in order from an object side to an image side:
a first lens element; a second lens element; a third lens element having positive refractive power; a fourth lens element; a fifth lens element having an object-side surface and an image-side surface being both aspheric; and a sixth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof, wherein the object-side surface and an image-side surface of the sixth lens element are aspheric; wherein the imaging lens assembly has a total of six lens elements, there is an air gap between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other; wherein an incident angle of a chief ray at a maximum image height on an image surface of the imaging lens assembly is CRA1.0Y, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, and the following conditions are satisfied:
38.0 degrees≦CRA1.0 Y,

| f 6|<| f 3|<| f 1|;
| f 6|<| f 3|<| f 2|;
| f 6|<| f 3|<| f 4|;
| f 6|<| f 3|<| f 5|; and
0.70< T 56/ T 45.

2 . The imaging lens assembly of claim 1 , wherein the first lens element has positive refractive power, and the second lens element has negative refractive power.

3 . The imaging lens assembly of claim 1 , wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, an Abbe number of the sixth lens element is V6, at least three of V1, V2, V3, V4, V5 and V6 are greater than 50, an f-number of the imaging lens assembly is Fno, and the following condition is satisfied:
1.0< Fno< 4.0.

4 . The imaging lens assembly of claim 1 , wherein a maximum value among maximum effective radii of object-side surfaces and image-side surfaces of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is SDmax, a minimum value among maximum effective radii of object-side surfaces and image-side surfaces of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is SDmin, and the following condition is satisfied:
2.75< SD max/ SD min<6.0.

5 . The imaging lens assembly of claim 1 , wherein the incident angle of the chief ray at the maximum image height on the image surface of the imaging lens assembly is CRA1.0Y, and the following condition is satisfied:
40.0 degrees<CRA1.0 Y< 62.5 degrees.

6 . The imaging lens assembly of claim 1 , wherein a half of a maximal field of view of the imaging lens assembly is HFOV, the incident angle of the chief ray at the maximum image height on the image surface of the imaging lens assembly is CRA1.0Y, and the following condition is satisfied:
0<HFOV/CRA1.0 Y< 1.0.

7 . The imaging lens assembly of claim 1 , wherein the sixth lens element has the image-side surface being concave in a paraxial region thereof, and the image-side surface of the sixth lens element comprises at least one convex shape in an off-axial region thereof.

8 . The imaging lens assembly of claim 1 , wherein an axial distance between an object-side surface of the first lens element and the image surface is TL, the incident angle of the chief ray at the maximum image height on the image surface of the imaging lens assembly is CRA1.0Y, the maximum image height of the imaging lens assembly is ImgH, and the following condition is satisfied:
0< TL /(tan(CRA1.0 Y )×Img H )<2.0.

9 . The imaging lens assembly of claim 1 , wherein an entrance pupil diameter of the imaging lens assembly is EPD, an axial distance between the image-side surface of the sixth lens element and the image surface is BL, and the following condition is satisfied:
1.25<EPD/ BL< 5.0.

10 . The imaging lens assembly of claim 1 , further comprises:
an aperture stop, wherein an axial distance between the aperture stop and the image-side surface of the sixth lens element is SD, the maximum image height of the imaging lens assembly is ImgH, and the following condition is satisfied:
0.80< SD /Img H <1.50.

11 . The imaging lens assembly of claim 1 , wherein a displacement in parallel with an optical axis from an axial vertex on the image-side surface of the sixth lens element to a maximum effective radius position on the image-side surface of the sixth lens element is SAG62, a central thickness of the sixth lens element is CT6, and the following condition is satisfied:
−3.0< SAG 62/ CT 6<−0.75.

12 . The imaging lens assembly of claim 1 , wherein the 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:
1.25< T 56/ T 45<125.

13 . The imaging lens assembly of claim 1 , wherein the axial distance between the fifth lens element and the sixth lens element is T56, a displacement in parallel with an optical axis from an axial vertex on the image-side surface of the fifth lens element to a maximum effective radius position on the image-side surface of the fifth lens element is SAG52, a displacement in parallel with the optical axis from an axial vertex on the object-side surface of the sixth lens element to a maximum effective radius position on the object-side surface of the sixth lens element is SAG61, and the following condition is satisfied:
3.0< T 56/( T 56− SAG 52+ SAG 61)<100.

14 . The imaging lens assembly of claim 1 , wherein a maximum effective radius of the image-side surface of the sixth lens element is SD62, an entrance pupil diameter of the imaging lens assembly is EPD, and the following condition is satisfied:
1.65≦ SD 62/EPD<5.0.

15 . The imaging lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the sixth lens element is R11, a curvature radius of the image-side surface of the sixth lens element is R12, and the following condition is satisfied:
( R 11+ R 12)/( R 11− R 12)<−0.50.

16 . An image capturing apparatus, comprising:
the imaging lens assembly of claim 1 ; and an image sensor, wherein the image sensor is disposed on the image surface of the imaging lens assembly.

17 . An electronic device, comprising:
the image capturing apparatus of claim 16 .

18 . An imaging lens assembly comprising, 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 the imaging lens assembly has a total of six lens elements, there is an air gap between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to

Assignees

• Largan Precision Co Ltd

Inventors

• Chen Kuan-Ming
• Chen Wei-Yu

Classifications

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/55

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

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B27/0025

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

• H04N5/2254

  Electricity · mapped topic