# US 11,029,487 B2 · Optical lens

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- Number: US 11,029,487 B2
- Document ID: US11029487B2
- Status: Granted
- Kind: B2
- Application number: 16/029,308
- Filed: 2018-07-06
- Published: 2019-10-03
- Granted: 2021-06-08
- Earliest claimed: 2018-03-30
- Assignees: Rays Optics Inc.
- Applicants: Rays Optics Inc.
- Inventors: Sheng-Tang Lai; Hung-You Cheng; Kuo-Chuan Wang; Yuan-Hung Su
- Web page: https://patentgrep.com/patent/US11029487B2

## CPC

- G02B 9/08: arranged about a stop
- G02B 9/12: having three components only
- G02B 13/0035: {having three lenses}
- G02B 13/14: for use with infrared or ultraviolet radiation ({G02B13/008, } G02B13/16 take precedence)
- 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 with a positive refractive power, a second lens group with a positive refractive power and an aperture stop. The first lens group and the second lens group are arranged in order from a first side to a second side, and the aperture stop is disposed between the first lens group and the second lens group. A total number of lenses with refractive powers in the optical lens is less than four, and the optical lens includes at least two lenses having an index of refraction of greater than 1.7.

## Claims

### Claim 1

An optical lens, comprising:
a first lens group with a positive refractive power and a second lens group with a positive refractive power arranged in order from a first side to a second side; and
an aperture stop disposed between the first lens group and the second lens group, a total number of lenses with refractive powers in the optical lens being less than four, at least two lenses of the optical lens having an Abbe number of smaller than 50, and the optical lens comprising at least two lenses having an index of refraction of greater than 1.7.

### Claim 2 (depends on 1)

The optical lens as claimed in claim 1, wherein the first lens group comprises a first lens and a second lens with refractive powers, the second lens group comprises a third lens with a refractive power, and the optical lens satisfies one of the following conditions:
(1) the first lens is a meniscus lens, the second lens is a bi-convex lens, and the third lens is a bi-convex lens;
(2) the first lens is an aspheric lens, the second lens is a spherical lens, and the third lens is an aspheric lens.

### Claim 3 (depends on 1)

The optical lens as claimed in claim 1, wherein the optical lens satisfies one of the following conditions:
(1) the optical lens has an aspheric lens between the first side and the aperture stop;
(2) the optical lens has only one aspheric lens between the aperture stop and the second side;
(3) all lenses of the optical lens are made from glass.

### Claim 4 (depends on 1)

The optical lens as claimed in claim 1, wherein an F-number of the optical lens is smaller than or equal to 2.2.

### Claim 5 (depends on 1)

The optical lens as claimed in claim 1, wherein a total lens length of the optical lens is smaller than 20 mm.

### Claim 6 (depends on 1)

The optical lens as claimed in claim 1, wherein a total track length of the optical lens is in the range of 20 to 40 mm.

### Claim 7

An optical lens, comprising:
a first lens group with a positive refractive power and a second lens group with a positive refractive power 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 first lens group comprises a first lens and a second lens with refractive powers, the second lens group comprises a third lens with a refractive power, and the optical lens satisfies the conditions:
2.5 mm<EFL <3.0 mm and −2.0<L1f/EFL <−1.4, where EFL is an effective focal length of the optical lens, and L1f is an effective focal length of the first lens.

### Claim 8 (depends on 7)

The optical lens as claimed in claim 7, wherein at least two lenses of the optical lens have an Abbe number of smaller than 50.

### Claim 9 (depends on 7)

The optical lens as claimed in claim 7, wherein the optical lens satisfies one of the following conditions:
(1) the optical lens has an aspheric lens between the magnified side and the aperture stop;
(2) the optical lens has only one aspheric lens between the aperture stop and the minified side;
(3) all lenses of the optical lens are made from glass.

### Claim 10 (depends on 7)

The optical lens as claimed in claim 7, wherein an F-number of the optical lens is smaller than or equal to 2.2.

### Claim 11 (depends on 7)

The optical lens as claimed in claim 7, wherein a total lens length of the optical lens is smaller than 20 mm.

### Claim 12 (depends on 7)

The optical lens as claimed in claim 7, wherein a total track length of the optical lens is in the range of 20 to 40 mm.

### Claim 13 (depends on 7)

The optical lens as claimed in claim 7, wherein the optical lens satisfies one of the following conditions:
(1) the first lens is a meniscus lens, the second lens is a bi-convex lens, and the third lens is a bi-convex lens;
(2) the first lens is an aspheric lens, the second lens is a spherical lens, and the third lens is an aspheric lens.

### Claim 14

An optical lens, comprising:
a first lens group with a positive refractive power and a second lens group with a positive refractive power 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, and the optical lens comprising at least two lenses having an index of refraction of greater than 1.7, wherein the first lens group comprises a first lens with a negative refractive power and a second lens with a positive refractive power, the second lens group comprises a third lens with a positive refractive power, and the optical lens satisfies the condition:
0.2<L3D/LT<0.45, where L3D is a diameter of a minified-side surface of the third lens, and LT is a total lens length that is a distance along an optical axis between a magnified-side surface of the first lens and the minified-side surface of the third lens, and wherein the optical lens satisfies one of the following conditions:
(1) the first lens is a meniscus lens, the second lens is a bi-convex lens, and the third lens is a bi-convex lens;
(2) the first lens is an aspheric lens, the second lens is a spherical lens, and the third lens is an aspheric lens.

### Claim 15 (depends on 14)

The optical lens as claimed in claim 14, wherein at least two lenses of the optical lens have an Abbe number of smaller than 50.

### Claim 16 (depends on 14)

The optical lens as claimed in claim 14, wherein the optical lens satisfies one of the following conditions:
(1) the optical lens has an aspheric lens between the magnified side and the aperture stop;
(2) the optical lens has only one aspheric lens between the aperture stop and the minified side;
(3) all lenses of the optical lens are made from glass.

### Claim 17 (depends on 14)

The optical lens as claimed in claim 14, wherein an F-number of the optical lens is smaller than or equal to 2.2.

### Claim 18 (depends on 14)

The optical lens as claimed in claim 14, wherein the total lens length LT of the optical lens is smaller than 20 mm.

### Claim 19 (depends on 14)

The optical lens as claimed in claim 14, wherein a total track length of the optical lens is in the range of 20 to 40 mm.

### Claim 20 (depends on 14)

The optical lens as claimed in claim 14,
wherein the optical lens satisfies the conditions:
2.5 mm<EFL <3.0 mm and −2.0<L1f/EFL <−1.4, where EFL is an effective focal length of the optical lens, and L1f is an effective focal length of the first lens.