# US 11,841,483 B2 · Optical lens including five lenses of −−+−+, −−+++ or −−+−+, or six lenses of −−−+−+ or −−++−+ refractive powers

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- Number: US 11,841,483 B2
- Document ID: US11841483B2
- Status: Granted
- Kind: B2
- Application number: 16/685,208
- Filed: 2019-11-15
- Published: 2020-06-18
- Granted: 2023-12-12
- Earliest claimed: 2018-12-14
- Assignees: Rays Optics Inc.
- Applicants: Rays Optics Inc.
- Inventors: Ching-Lung Lai; Hung-You Cheng; Hsin-Te Chen; Sheng-Tang Lai
- Web page: https://patentgrep.com/patent/US11841483B2

## CPC

- G02B 9/34: having four components only
- G02B 13/0045: {having five or more lenses}
- G02B 9/60: having five components only
- G02B 9/62: having six components only
- G02B 13/006: {at least one element being a compound optical element, e.g. cemented elements}
- G02B 13/04: Reversed telephoto objectives
- 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 includes a first lens group, a second lens group and an aperture stop. The first lens group includes three lenses with refractive powers. The second lens group has a positive refractive power and includes two lenses with refractive power. The aperture stop is disposed between the first lens group and the second lens group. The optical lens satisfies the conditions of 2 mm<DL<6 mm, LT<15 mm and 0.2<DL/LT<0.38, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens.

## Claims

### Claim 1

An optical lens, comprising:
a first lens group comprising three lenses with refractive powers, two of the three lenses of the first lens group being made from glass, and the three lenses comprising a spherical lens and an aspheric lens;
a second lens group having a positive refractive power and comprising two lenses with refractive powers, and the two lenses comprising an aspheric lens; and
an aperture stop disposed between the first lens group and the second lens group, wherein a total number of lenses in the optical lens is less than 9, and the optical lens satisfies the conditions:
0.2<DL/LT<0.38; and
0.05<EFL/LT<0.1, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, EFL is an effective focal length of the optical lens, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens,
wherein the optical lens comprises, in order from a magnified side to a minified side of the optical lens, a meniscus lens, an aspheric lens, an aspheric lens, an aspheric lens and an aspheric lens.

### Claim 2 (depends on 1)

The optical lens as claimed in claim 1, wherein an F-number of the optical lens is larger than or equal to 1.8.

### Claim 3 (depends on 1)

The optical lens as claimed in claim 1, wherein a full field of view of the optical lens is greater than 190 degrees and smaller than 230 degrees.

### Claim 4 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens comprises three lenses with an Abbe number of greater than 50.

### Claim 5 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens comprises a cemented lens having a lens with an Abbe number of greater than 50.

### Claim 6 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens comprises a cemented lens having an aspheric joint surface.

### Claim 7 (depends on 1)

The optical lens as claimed in claim 1, wherein a total track length of the optical lens measured between a lens surface furthest from an image plane and the image plane is smaller than 18 mm.

### Claim 8 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens comprises a doublet lens or a triplet lens.

### Claim 9 (depends on 1)

The optical lens as claimed in claim 1, wherein a lens furthest from an image plane of the optical lens is made from glass.

### Claim 10

An optical lens, comprising:
a first lens group comprising three lenses with refractive powers, two of the three lenses of the first lens group being made from glass, and the three lenses comprising a spherical lens and an aspheric lens;
a second lens group having a positive refractive power and comprising two lenses with refractive powers, and the two lenses comprising an aspheric lens; and
an aperture stop disposed between the first lens group and the second lens group, wherein a total number of lenses in the optical lens is less than 9, and the optical lens satisfies the conditions:
0.2<DL/LT<0.38; and
0.05<EFL/LT<0.1, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, EFL is an effective focal length of the optical lens, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens,
wherein the optical lens comprises, in order from a magnified side to a minified side, a meniscus lens, an aspheric lens, an aspheric lens, a bi-convex lens and an aspheric lens.

### Claim 11 (depends on 10)

The optical lens as claimed in claim 10, wherein wherein an F-number of the optical lens is larger than or equal to 1.8.

### Claim 12

An optical lens, comprising:
a first lens group comprising three lenses with refractive powers, two of the three lenses of the first lens group being made from glass, and the three lenses comprising a spherical lens and an aspheric lens;
a second lens group having a positive refractive power and comprising two lenses with refractive powers, and the two lenses comprising an aspheric lens; and
an aperture stop disposed between the first lens group and the second lens group, wherein a total number of lenses in the optical lens is less than 9, and the optical lens satisfies the conditions:
0.2<DL/LT<0.38; and
0.05<EFL/LT<0.1, where DL is a diameter of a lens surface of the second lens group furthest from the first lens group, EFL is an effective focal length of the optical lens, and LT is a length measured on the optical axis between two outermost lens surfaces of the optical lens,
wherein the optical lens has six lenses with refractive powers of negative, negative, negative, positive, negative and positive.

### Claim 13 (depends on 12)

The optical lens as claimed in claim 12, wherein an F-number of the optical lens is larger than or equal to 1.8.

### Claim 14 (depends on 12)

The optical lens as claimed in claim 12, wherein a full field of view of the optical lens is greater than 190 degrees and smaller than 230 degrees.

### Claim 15 (depends on 12)

The optical lens as claimed in claim 12, wherein the optical lens comprises three lenses with an Abbe number of greater than 50.

### Claim 16 (depends on 12)

The optical lens as claimed in claim 12, wherein the optical lens comprises a cemented lens having a lens with an Abbe number of greater than 50.

### Claim 17 (depends on 12)

The optical lens as claimed in claim 12, wherein the optical lens comprises a cemented lens having an aspheric joint surface.

### Claim 18 (depends on 12)

The optical lens as claimed in claim 12, wherein a total track length of the optical lens measured between a lens surface furthest from an image plane and the image plane is smaller than 18 mm.

### Claim 19 (depends on 12)

The optical lens as claimed in claim 12, wherein the optical lens comprises a doublet lens or a triplet lens.

### Claim 20 (depends on 12)

The optical lens as claimed in claim 12, wherein a lens furthest from an image plane of the optical lens is made from glass.