# US 10,598,907 B2 · Optical lens

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- Number: US 10,598,907 B2
- Document ID: US10598907B2
- Status: Granted
- Kind: B2
- Application number: 15/628,181
- Filed: 2017-06-20
- Published: 2018-05-03
- Granted: 2020-03-24
- Earliest claimed: 2016-10-28
- Assignees: Rays Optics Inc.
- Applicants: Rays Optics Inc.
- Inventors: Bing-Ju Chiang; Yuan-Hung Su; Kuo-Chuan Wang
- Web page: https://patentgrep.com/patent/US10598907B2

## CPC

- G02B 9/62: having six components only
- G02B 13/06: Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces}
- G02B 3/02: with non-spherical faces (G02B3/10 takes precedence)
- G02B 13/0045: {having five or more lenses}
- G02B 9/64: having more than six components
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical lens includes a first lens group having negative refractive power, a second lens group having positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A total number of lenses of the two lens groups is less than 9. The first lens group has at least three lenses with refractive power and at least one aspheric lens. The second lens group has at least three lenses with refractive power and at least one aspheric lens. The first lens group includes a lens having positive refractive power and an Abbe number of smaller than 20.

## Claims

### Claim 1

An optical lens, comprising:
a first lens group with negative refractive power comprising at least three lenses with refractive powers, the at least three lenses with refractive powers including at least one aspheric lens, and the first lens group having a lens with positive refractive power and an Abbe number of smaller than 20;
a second lens group with positive refractive power comprising at least three lenses with refractive powers, the at least three lenses with refractive powers including at least one aspheric lens, and a total number of lenses in the first lens group and the second lens group being less than 9, wherein each of the first lens group and the second lens group comprises a lens having a refractive index variation as a function of temperature (dn/dt) of smaller than −80 ×10−6 K−1; and
an aperture stop disposed between the two lens groups.

### Claim 2 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens satisfies the condition of nd> 1.66, where nd denotes a refractive index of the lens with positive refractive power in the first lens group.

### Claim 3 (depends on 2)

The optical lens as claimed in claim 2, wherein a distance between any two lenses in the optical lens remains fixed on picking-up images at various object distances.

### Claim 4 (depends on 1)

The optical lens as claimed in claim 1, wherein the second lens group comprises a cemented lens.

### Claim 5 (depends on 1)

The optical lens as claimed in claim 1, wherein the lens having positive refractive power is nearest the aperture stop than any other lens in the first lens group.

### Claim 6 (depends on 1)

The optical lens as claimed in claim 1, wherein the at least one aspheric lens in the first lens group is located further away from the aperture stop than the lens having positive refractive power in the first lens group.

### Claim 7 (depends on 1)

The optical lens as claimed in claim 1, wherein the at least one aspheric lens in the second lens group is located further away from the aperture stop than any other singlet lens in the second lens group.

### Claim 8 (depends on 1)

The optical lens as claimed in claim 1, wherein the second lens group comprises two aspheric lenses.

### Claim 9 (depends on 1)

The optical lens as claimed in claim 1, wherein a maximum image circle diameter at a visible light image plane of the optical lens is 4-6 mm.

### Claim 10 (depends on 1)

The optical lens as claimed in claim 1, wherein a distance between any two lenses in the optical lens remains fixed on picking-up images at various object distances.

### Claim 11 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens satisfies the condition:
R<5.7; and
R*TTL<140
where R denotes a radius of curvature of an image-side surface of a lens in the first lens group nearest the object side, and TTL denotes a total track length.

### Claim 12 (depends on 11)

The optical lens as claimed in claim 11, wherein the second lens group comprises a cemented lens.

### Claim 13 (depends on 11)

The optical lens as claimed in claim 11, wherein the lens having positive refractive power is nearest the aperture stop than any other lens in the first lens group.

### Claim 14 (depends on 11)

The optical lens as claimed in claim 11, wherein the at least one aspheric lens in the first lens group is located further away from the aperture stop than the lens having positive refractive power in the first lens group.

### Claim 15 (depends on 11)

The optical lens as claimed in claim 11, wherein the at least one aspheric lens in the second lens group is located further away from the aperture stop than any other singlet lens in the second lens group.

### Claim 16 (depends on 11)

The optical lens as claimed in claim 11, wherein the second lens group comprises two aspheric lenses.

### Claim 17 (depends on 11)

The optical lens as claimed in claim 11, wherein a maximum image circle diameter at a visible light image plane of the optical lens is 4-6 mm.

### Claim 18 (depends on 11)

The optical lens as claimed in claim 11, wherein a distance between any two lenses in the optical lens remains fixed on picking-up images at various object distances.