# US 10,191,251 B2 · Optical lens

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- Number: US 10,191,251 B2
- Document ID: US10191251B2
- Status: Granted
- Kind: B2
- Application number: 15/235,583
- Filed: 2016-08-12
- Published: 2018-02-15
- Granted: 2019-01-29
- Earliest claimed: 2016-08-12
- Assignees: Rays Optics Inc.
- Applicants: Rays Optics Inc.
- Inventors: Sheng-Tang Lai
- Web page: https://patentgrep.com/patent/US10191251B2

## CPC

- G02B 13/0055: {employing a special optical element}
- G02B 5/005: {Diaphragms (for cameras G03B9/02)}
- G02B 9/60: having five components only
- G02B 13/0045: {having five or more lenses}
- G02B 27/0037: {with diffracting elements (G02B27/0056 takes precedence; holographic optical elements G02B5/32; zone systems G02B5/1876)}
- G02B 27/4211: {correcting chromatic aberrations (G02B27/0056, G02B27/4222, G02B27/4227 take precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(Φd*V)/Φr|<2, where Φd denotes refractive power of the diffractive optical surface, Φr denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.

## Claims

### Claim 1

An optical lens, comprising:
a first lens group with negative refractive power and a second lens group with positive refractive power, a number of lenses with refractive power of the first lens group being smaller than three, and a number of lenses with refractive power of the second lens group being smaller than five; and
an aperture stop disposed between the first lens group and the second lens group, wherein the second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition:
0<|(Φd*V)/Φr|<2
where Φd denotes refractive power of the diffractive optical surface, Φr denotes refractive power of the lens with the diffractive optical surface, and V denotes an Abbe number of the lens with the diffractive optical surface.

### Claim 2 (depends on 1)

The optical lens as claimed in claim 1, wherein the lens with a diffractive optical surface satisfies the condition:
20<V<60.

### Claim 3 (depends on 1)

The optical lens as claimed in claim 1, wherein the first lens group comprises an aspheric lens with positive refractive power and an aspheric lens with negative refractive power.

### Claim 4 (depends on 1)

The optical lens as claimed in claim 1, wherein the lens with a diffractive optical surface is an aspheric lens.

### Claim 5 (depends on 1)

The optical lens as claimed in claim 1, wherein a lens of the second lens group nearest the aperture stop is a spherical lens.

### Claim 6 (depends on 5)

The optical lens as claimed in claim 5, wherein the spherical lens satisfies the condition:
V>70,
where V denotes an Abbe number of the spherical lens.

### Claim 7 (depends on 1)

The optical lens as claimed in claim 1, wherein a focus shift of the optical lens is smaller than 8 μm, where the focus shift is defined as a shift in a focal plane of 850 nm infrared light relative to a standard focal plane, and the standard focal plane is a focal plane of 555 nm or 587 nm green light passing through the optical lens.

### Claim 8

An optical lens, comprising:
a first lens group with negative refractive power and comprising two lenses with refractive power,
a second lens group with positive refractive power and comprising three lenses with refractive power, one of the three lenses having a diffractive optical surface, and the first lens group and the second lens group being arranged in order from a magnified side to a minified side; and
an aperture stop disposed between the first lens group and the second lens group, wherein the optical lens satisfies the condition:
|(0.5*IMA)/(EFL*TAN(X))−1|<0.3
where EFL denotes an effective focal length for visible light, IMA denotes a maximum image circle of an image plane formed at an effective focal length for visible light, and X denotes half of a maximum field of view.

### Claim 9 (depends on 8)

The optical lens as claimed in claim 8, wherein the lens having a diffractive optical surface satisfies the condition:
20<V<60,
where V denotes an Abbe number of the lens.

### Claim 10 (depends on 8)

The optical lens as claimed in claim 8, wherein the second lens group comprises an aspheric lens with positive refractive power and an aspheric lens with negative refractive power.

### Claim 11 (depends on 8)

The optical lens as claimed in claim 8, wherein the lens having a diffractive optical surface is an aspheric lens.

### Claim 12 (depends on 8)

The optical lens as claimed in claim 8, wherein a lens of the second lens group nearest the aperture stop is a spherical lens.

### Claim 13 (depends on 12)

The optical lens as claimed in claim 12, wherein the spherical lens satisfies the condition:
V>70,
where V denotes an Abbe number of the spherical lens.

### Claim 14 (depends on 8)

The optical lens as claimed in claim 8, wherein a focus shift of the optical lens is smaller than 8 μm, where the focus shift is defined as a shift in a focal plane of 850 nm infrared light relative to a standard focal plane, and the standard focal plane is a focal plane of 555 nm or 587 nm green light passing through the optical lens.

### Claim 15

An optical lens, comprising:
a first lens group with negative refractive power, a number of lenses with refractive power of the first lens group being smaller than three;
a second lens group with positive refractive power, a number of lenses with refractive power of the second lens group being smaller than five, and the second lens group having a lens with a diffractive optical surface; and
an aperture stop disposed between the first lens group and the second lens group, wherein the optical lens satisfies the condition:
TTL/IMA<3.3
where TTL denotes a total track length of the optical lens, and IMA denotes a maximum image circle of an image plane formed at an effective focal length for visible light.

### Claim 16 (depends on 15)

The optical lens as claimed in claim 15, wherein the lens with a diffractive optical surface satisfies the condition:
20<V<60,
where V denotes an Abbe number of the lens.

### Claim 17 (depends on 15)

The optical lens as claimed in claim 15, wherein the first lens group comprises an aspheric lens with positive refractive power and an aspheric lens with negative refractive power, and the second lens group comprises an aspheric lens with positive refractive power and an aspheric lens with negative refractive power.

### Claim 18 (depends on 15)

The optical lens as claimed in claim 15, wherein the lens with a diffractive optical surface is an aspheric lens.

### Claim 19 (depends on 15)

The optical lens as claimed in claim 15, wherein a lens of the second lens group nearest the aperture stop is a spherical lens, and the spherical lens satisfies the condition:
V>70,
where V denotes an Abbe number of the spherical lens.

### Claim 20 (depends on 15)

The optical lens as claimed in claim 15, wherein a focus shift of the optical lens is smaller than 8 μm, where the focus shift is defined as a shift in a focal plane of 850 nm infrared light relative to a standard focal plane, and the standard focal plane is a focal plane of 555 nm or 587 nm green light passing through the optical lens.