# US 10,310,229 B2 · Photographing optical lens assembly, image capturing unit and electronic device

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- Number: US 10,310,229 B2
- Document ID: US10310229B2
- Status: Granted
- Kind: B2
- Application number: 15/703,702
- Filed: 2017-09-13
- Published: 2018-10-04
- Granted: 2019-06-04
- Earliest claimed: 2017-03-28
- Assignees: Largan Precision Co., Ltd.
- Applicants: LARGAN Precision Co., Ltd.
- Inventors: Hsin-Hsuan Huang
- Web page: https://patentgrep.com/patent/US10310229B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/62: having six components only
- G02B 13/005: {having spherical lenses only}
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A photographing optical lens assembly includes six lens elements which are, 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 second lens element has positive refractive power. The third lens element has negative refractive power. The sixth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point.

## Claims

### Claim 1

A photographing optical lens assembly 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 having positive refractive power;
a third lens element having negative refractive power;
a fourth lens element having an object-side surface being convex in a paraxial region thereof;
a fifth lens element; and
a sixth lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point;
wherein a focal length of the photographing optical lens assembly is f, a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a curvature radius of an image-side surface of the fourth lens element is R8, a curvature radius of an image-side surface of the fifth lens element is R10, an Abbe number of the third lens elements is V3, an Abbe number of the fourth lens elements is V4, an Abbe number of the fifth lens element is V5, and the following conditions are satisfied:
0≤(f/R8)+(f/R10)<1.0;
|f/f4|+|f/f5|<0.80;
|f/f1|+|f/f4|<0.50; and
15.0<V3+V4+V5<96.0.

### Claim 2 (depends on 1)

The photographing optical lens assembly of claim 1, further comprising an aperture stop disposed between an imaged object and an object-side surface of the third lens element, wherein the focal length of the photographing optical lens assembly is f, the focal length of the first lens element is f1, an axial distance between the aperture stop and the image-side surface of the sixth lens element is SD, an axial distance between an object-side surface of the first lens element and the image-side surface of the sixth lens element is TD, and the following conditions are satisfied:
0.73<SD/TD<1.10; and
−0.30<f/f1<0.50.

### Claim 3 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a curvature radius of an image-side surface of the first lens element is R2, a curvature radius of an image-side surface of the second lens element is R4, and the following condition is satisfied:
−1.40<(R2+R4)/(R2−R4)<−0.65.

### Claim 4 (depends on 1)

The photographing optical lens assembly of claim 1, wherein a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, and the following condition is satisfied:
0.80<(R5+R6)/(R5−R6)<3.40.

### Claim 5 (depends on 1)

The photographing optical lens assembly of claim 1, wherein each of at least three of the six lens elements of the photographing optical lens assembly has an Abbe number less than 25.0.

### Claim 6 (depends on 1)

The photographing optical lens assembly of claim 1, wherein the focal length of the photographing optical lens assembly is f, the curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:
−0.10<f/R8<1.0.

### Claim 7 (depends on 1)

The photographing optical lens assembly of claim 1, wherein the focal length of the photographing optical lens assembly is f, the curvature radius of the image-side surface of the fifth lens element is R10, and the following condition is satisfied:
−0.20<f/R10<0.80.

### Claim 8 (depends on 1)

The photographing optical lens assembly of claim 1, wherein 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, a sum of central thicknesses of the six lens elements of the photographing optical lens assembly is ΣCT, and the following condition is satisfied:
0.29(T34+T45)/ΣCT<1.0.

### Claim 9 (depends on 1)

The photographing optical lens assembly of claim 1, wherein the focal length of the photographing optical lens assembly is f, an axial distance between an object-side surface of the first lens element and an image surface is TL, and the following condition is satisfied:
0.80<TL/f<1.30.

### Claim 10

A photographing optical lens assembly 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 having positive refractive power;
a third lens element;
a fourth lens element;
a fifth lens element; and
a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point;
wherein a focal length of the photographing optical lens assembly is f, 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 curvature radius of an image-side surface of the fourth lens element is R8, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of an image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the sixth lens element is R11, 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, a refractive index of the fourth lens element is N4, and the following conditions are satisfied:
−0.40<(f/R8)+(f/R10)<5.0;
20.0<V3+V4+V5<65.0;
−3.0<R11/R9<0.75;
V4/N4<12.5; and
−0.20<(f/f2)−(f/f1)+(f/f3)<3.50.

### Claim 11 (depends on 10)

The photographing optical lens assembly of claim 10, wherein the third lens element has negative refractive power, the second lens element has an object-side surface being convex in a paraxial region thereof, and the third lens element has an image-side surface being concave in a paraxial region thereof.

### Claim 12 (depends on 10)

The photographing optical lens assembly of claim 10, wherein the focal length of the photographing optical lens assembly is f, the curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied:
0≤f/R8.

### Claim 13 (depends on 10)

The photographing optical lens assembly of claim 10, wherein the focal length of the photographing optical lens assembly is f, the curvature radius of the image-side surface of the fourth lens element is R8, the curvature radius of the image-side surface of the fifth lens element is R10, and the following condition is satisfied:
−0.25<(f/R8)+(f/R10)<2.0.

### Claim 14 (depends on 10)

The photographing optical lens assembly of claim 10, wherein the focal length of the photographing optical lens assembly is f, the focal length of the first lens element is f1, a focal length of the sixth lens element is f6, and the following conditions are satisfied:
−0.30<f/f1<0.35; and
−0.80<f/f6<0.20.

### Claim 15 (depends on 10)

The photographing optical lens assembly of claim 10, wherein the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the object-side surface of the sixth lens element is R11, the focal length of the photographing optical lens assembly is f, a vertical distance between a critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, and the following conditions are satisfied:
−0.40<R11/R9<0.35; and
0.10<Yc62/f<1.0.

### Claim 16 (depends on 10)

The photographing optical lens assembly of claim 10, wherein the focal length of the photographing optical lens assembly is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following condition is satisfied:
|f/f4|+|f/f5|<0.50.

### Claim 17 (depends on 10)

The photographing optical lens assembly of claim 10, wherein an axial distance between an object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing optical lens assembly is ImgH, an f-number of the photographing optical lens assembly is Fno, half of a maximum field of view of the photographing optical lens assembly is HFOV, and the following conditions are satisfied:
TL/ImgH<2.0;
0.75<tan(HFOV)<1.40; and
1.20<Fno<2.20.

### Claim 18

A photographing optical lens assembly 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 having positive refractive power;
a third lens element having negative refractive power;
a fourth lens element;
a fifth lens element; and
a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point;
wherein a focal length of the photographing optical lens assembly is f, 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 curvature radius of an image-side surface of the fourth lens element is R8, a curvature radius of an object-side surface of the fifth lens element is R9, a curvature radius of an image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the sixth lens elements is R11, 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, and the following conditions are satisfied:
0≤|f/R8|+|f/R10|<0.50;
−0.20<(f/f2)−(f/f1)+(f/f3)<3.50;
15.0<V3+V4−V5<96.0;
−0.40<R11/R9<0.35;
−0.15<(f/R8)+(f/R10)<1.0; and
|f/f1|+|f/f4|<0.50.

### Claim 19 (depends on 18)

The photographing optical lens assembly of claim 18, wherein the first lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, and the object-side surface of the sixth lens element is convex in a paraxial region thereof.

### Claim 20 (depends on 18)

The photographing optical lens assembly of claim 18, wherein the Abbe number of the fourth lens element is V4, a refractive index of the fourth lens element is N4, and the following condition is satisfied:
V4/N4<12.5.

### Claim 21 (depends on 18)

The photographing optical lens assembly of claim 18, wherein 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, a sum of central thicknesses of the six lens elements of the photographing optical lens assembly is ΣCT, and the following condition is satisfied:
0.29≤(T34+T45)/ΣCT<1.0.

### Claim 22 (depends on 18)

The photographing optical lens assembly of claim 18, wherein an f-number of the photographing optical lens assembly is Fno, the focal length of the photographing optical lens assembly is f, the curvature radius of the image-side surface of the fourth lens element is R8, and the following conditions are satisfied:
1.20<Fno<2.20; and
0≤f/R8<1.0.

### Claim 23 (depends on 18)

The photographing optical lens assembly of claim 18, wherein each of at least three of the six lens elements of the photographing optical lens assembly has an Abbe number less than 25.0.

### Claim 24 (depends on 18)

The photographing optical lens assembly of claim 18, wherein a curvature radius of an image-side surface of the first lens element is R2, a curvature radius of an image-side surface of the second lens element is R4, and the following condition is satisfied:
−1.20<(R2+R4)/(R2−R4)<−0.75.

### Claim 25 (depends on 18)

The photographing optical lens assembly of claim 18, wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, and the following condition is satisfied:
2.60<T12/T23<7.50.

### Claim 26 (depends on 18)

The photographing optical lens assembly of claim 18, wherein the image-side surface of the fourth lens element has at least one convex shape in an off-axial region thereof, and the image-side surface of the fifth lens element has at least one convex shape in an off-axial region thereof.

### Claim 27 (depends on 18)

An image capturing unit, comprising:
the photographing optical lens assembly of claim 18;
a driving device; and
an image sensor disposed on an image surface of the photographing optical lens assembly.

### Claim 28 (depends on 27)

An electronic device, comprising:
the image capturing unit of claim 27.

### Claim 29

A photographing optical lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side:
a first lens element having positive refractive power;
a second lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof;
a third lens element;
a fourth lens element;
a fifth lens element; and
a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point;
wherein a focal length of the photographing optical lens assembly is f, a focal length of the first lens element is f1, a curvature radius of an image-side surface of the first lens element if R2, a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of an image-side surface of the fourth lens element is R8, a curvature radius of an image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
0≤f/R8;
0≤f/R10,
0<(R5+R6)/(R5−R6);
31 1.40<(R2+R4)/(R2−R4)<−0.65; and
−0.30<f/f1<0.35.

### Claim 30 (depends on 29)

The photographing optical lens assembly of claim 29, wherein the third lens element has negative refractive power, the sixth lens element has an object-side surface being convex in a paraxial region thereof.

### Claim 31 (depends on 29)

The photographing optical lens assembly of claim 29, wherein 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, and the following condition is satisfied:
15.0<V3+V4+V5<96.0.

### Claim 32 (depends on 29)

The photographing optical lens assembly of claim 29, wherein an axial distance between an object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing optical lens assembly is ImgH, an f-number of the photographing optical lens assembly is Fno, half of a maximum field of view of the photographing optical lens assembly is HFOV, and the following conditions are satisfied:
TL/ImgH<2.0;
0.75<tan(HFOV)<1.40; and
1.20<Fno<2.20.