# US 9,753,253 B2 · Optical lens system

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- Number: US 9,753,253 B2
- Document ID: US9753253B2
- Status: Granted
- Kind: B2
- Application number: 14/560,440
- Filed: 2014-12-04
- Published: 2016-06-09
- Granted: 2017-09-05
- Earliest claimed: 2014-12-04
- Assignees: Young Optics Inc.
- Applicants: Chen-Cheng Liao
- Inventors: Chen-Cheng Liao
- Web page: https://patentgrep.com/patent/US9753253B2

## CPC

- G02B 13/004: {having four lenses}
- G02B 9/58: arranged - + + -
- G02B 9/60: having five components only
- G02B 13/0045: {having five or more lenses}
- G02B 13/06: Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical lens system includes a first lens element of negative refractive power having a meniscus shape, a second lens element of positive refractive power having a convex image-side surface and disposed adjacent to the first lens element, a third lens element of positive refractive power having at least one aspheric surface and disposed adjacent to the second lens element, and a fourth lens element of negative refractive power having at least one aspheric surface and disposed adjacent to the third lens element.

## Claims

### Claim 1

An optical lens system, comprising:
a first lens element of negative refractive power having a meniscus shape;
a second lens element of positive refractive power having a convex image-side surface and a concave object-side surface and disposed adjacent to the first lens element, wherein the second lens is a spherical lens;
a third lens element of positive refractive power having at least one aspheric surface and disposed adjacent to the second lens element; and
a fourth lens element of negative refractive power having at least one aspheric surface and disposed adjacent to the third lens element,
wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.

### Claim 2 (depends on 1)

The optical lens system as claimed in claim 1, wherein the condition:
0.2<|f1/f2|<0.7 is satisfied, where f1 denotes a focal length of the first lens element and f2 denotes a focal length of the second lens element.

### Claim 3 (depends on 1)

The optical lens system as claimed in claim 1, wherein the condition:
0.8<|f3/EFL|<2.0 is satisfied, where f3 denotes a focal length of the third lens element L3 and EFL denotes an effective focal length of the optical lens system.

### Claim 4 (depends on 1)

The optical lens system as claimed in claim 1, wherein the first lens element has a convex object-side surface and a concave image-side surface.

### Claim 5 (depends on 1)

The optical lens system as claimed in claim 1, wherein the third lens element has a convex image-side surface.

### Claim 6 (depends on 1)

The optical lens system as claimed in claim 1, wherein the fourth lens element has a concave image-side surface.

### Claim 7 (depends on 1)

The optical lens system as claimed in claim 1, wherein the fourth lens element has a convex image-side surface.

### Claim 8 (depends on 1)

The optical lens system as claimed in claim 1, further comprising:
a lens element of negative refractive power disposed between the first and second lens elements.

### Claim 9 (depends on 1)

The optical lens system as claimed in claim 1, further comprising an aperture stop disposed between the second lens element and the third lens element.

### Claim 10

An optical lens system comprising in order from an object side to an image side:
a first lens element having negative refractive power, wherein the first lens element has a convex object-side surface and a concave image-side surface;
a second lens element having refractive power, wherein the second lens element has a convex object-side surface and a convex image-side surface, and an interval between the first lens element and the second lens element is smaller than or equal to 2.306 mm;
a third lens element having refractive power and a convex image-side surface; and
a fourth lens element having refractive power, wherein in at least one of the third lens element and the fourth lens element is an aspheric lens element, wherein the condition:
0.2<|f1/f2|<0.7 is satisfied, where f1 denotes a focal length of the first lens element and f2 denotes a focal length of the second lens element.

### Claim 11 (depends on 10)

The optical lens system as claimed in claim 10, wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.

### Claim 12 (depends on 10)

The optical lens system as claimed in claim 10, wherein the condition:
0.8<|f3/EFL|<2.0 is satisfied, where f3 denotes a focal length of the third lens element L3 and EFL denotes an effective focal length of the optical lens system.

### Claim 13 (depends on 10)

The optical lens system as claimed in claim 10, wherein the condition:
0.7<|f2/f3|<1.9 is satisfied, where f2 denotes a focal length of the second lens element and f3 denotes a focal length of the third lens element.

### Claim 14 (depends on 10)

The optical lens system as claimed in claim 10, further comprising an aperture stop disposed between the second lens element and the third lens element.

### Claim 15 (depends on 10)

The optical lens system as claimed in claim 10, further comprising:
a lens element of negative refractive power disposed between the first and second lens elements.

### Claim 16

An optical lens system comprising in order from an object side to an image side:
a first lens element having negative refractive power, wherein the first lens element has a convex object-side surface and a concave image-side surface;
a second lens element having refractive power, wherein the second lens element has a convex object-side surface and a convex image-side surface, and an interval between the first lens element and the second lens element is smaller than or equal to 2.306 mm;
a third lens element having refractive power and a convex image-side surface;
a fourth lens element having refractive power, wherein in at least one of the third lens element and the fourth lens element is an aspheric lens element; and
a lens element of negative refractive power disposed between the first and second lens elements,
wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.

### Claim 17

An optical lens system, comprising:
a first lens element of negative refractive power having a meniscus shape;
a second lens element of positive refractive power having a convex image-side surface and disposed adjacent to the first lens element, wherein the second lens is a spherical lens;
a third lens element of positive refractive power having at least one aspheric surface and disposed adjacent to the second lens element;
a fourth lens element of negative refractive power having at least one aspheric surface and disposed adjacent to the third lens element; and
a lens element of negative refractive power disposed between the first and second lens elements,
wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.