# US 9,753,251 B2 · Optical image capturing system

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- Number: US 9,753,251 B2
- Document ID: US9753251B2
- Status: Granted
- Kind: B2
- Application number: 14/818,008
- Filed: 2015-08-04
- Published: 2016-08-04
- Granted: 2017-09-05
- Earliest claimed: 2015-01-29
- Assignees: Ability Opto-Electronics Technology Co., Ltd.
- Applicants: Ability Opto-Electronics Technology Co., Ltd.
- Inventors: Yao-Wei Liu; Yeong-Ming Chang
- Web page: https://patentgrep.com/patent/US9753251B2

## CPC

- G02B 13/0035: {having three lenses}
- G02B 13/00: Optical objectives specially designed for the purposes specified below (with variable magnification {in general} G02B15/00)
- G02B 13/002: {having at least one aspherical surface}
- G02B 13/004: {having four lenses}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A three-piece optical lens for capturing image and a three-piece optical module for capturing image, along the optical axis in order from an object side to an image side, include a first lens with positive refractive power; a second lens with refractive power; and a third lens with refractive power; and at least one of the image-side surface and object-side surface of each of the three lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

## Claims

### Claim 1

An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power;
a second lens having refractive power;
a third lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the three lenses with refractive power; at least one of the second lens and the third lens has positive refractive power; the third lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side, and both the object-side surface and the image-side surface of the third lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2≦f/HEP≦6.0; 1.0≦HOS/f≦2.0; and 0<Σ|InRS|/InTL≦3;
where f1, f2 and f3 are focal lengths of the first lens to the third lens, respectively; f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HOS is a distance on the optical axis from an object-side surface of the first lens to the image plane; InTL is a distance between the object-side surface of the first lens and the image-side surface of the third lens; and Σ|InRS| is of an sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point to the point at the maximum effective semi diameter, i.e. Σ|InRS|=InRSO+InRSI while InRSO is of a sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface and InRSI is of a sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface;
wherein the second lens has negative refractive power;
wherein the optical image capturing system further comprises an image sensor on the image plane, wherein the optical image capturing system further satisfies:
0 <HOS/HOI≦1.63;
where HOI is a half of a diagonal line of an effective sensing area of the image sensor.

### Claim 2 (depends on 1)

The optical image capturing system of claim 1, wherein the optical image capturing system further satisfies:
|TDT|<60%;
where TDT is a TV distortion.

### Claim 3 (depends on 1)

The optical image capturing system of claim 1, wherein the optical image capturing system further satisfies:
|ODT|≦50%;
where ODT is an optical distortion.

### Claim 4 (depends on 1)

The optical image capturing system of claim 1, wherein the optical image capturing system further satisfies:
0 mm<HOS≦4.5 mm

### Claim 5 (depends on 1)

The optical image capturing system of claim 1, wherein the optical image capturing system further satisfies:
0 degree<HAF≦70 degrees;
where HAF is a half of a view angle of the optical image capturing system.

### Claim 6 (depends on 1)

The optical image capturing system of claim 1, wherein the optical image capturing system further satisfies:
0.45≦InTL/HOS≦0.9.

### Claim 7 (depends on 1)

The optical image capturing system of claim 1, further comprising an aperture, wherein the optical image capturing system further satisfies:
0.5≦InS/HOS≦1.1;
where InS is a distance in parallel with the optical axis between the aperture and the image plane.

### Claim 8

An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power;
a second lens having refractive power;
a third lens having refractive power; and
an image plane;
wherein the optical image capturing system consists of the three lenses with refractive power; at least two of the lenses from the first lens to the third lens each has at least an inflection point on at least a surface thereof; at least one of the second lens and the third lens has positive refractive power; the third lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side, and both the object-side surface and the image-side surface of the third lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1. 2≦f/HEP≦6.0; 1.0≦HOS/f≦2.0; and 0<Σ|InRS|/InTL≦3;
where f1, f2 and f3 are focal lengths of the first lens to the third lens, respectively; f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HOS is a distance on the optical axis between an object-side surface, which face the object side, of the first lens and the image plane; InTL is a distance between the object-side surface of the first lens and the image-side surface of the third lens; and Σ|InRS| is of an sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point to the point at the maximum effective semi diameter, i.e. Σ|InRS|=InRSO+InRSI while InRSO is of a sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface and InRSI is of a sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface;
wherein the second lens has negative refractive power.

### Claim 9 (depends on 8)

The optical image capturing system of claim 8, wherein the third lens has positive refractive power; and the object-side surface and the image-side surface of the third lens each has at least an inflection point.

### Claim 10 (depends on 8)

The optical image capturing system of claim 8, wherein the optical image capturing system further satisfies:
0.5≦ΣPPR≦10; 2≦(TP1+IN12)/TP2≦10; and 1.8≦(TP3+IN23)/TP2≦10;
where PPR is a ratio of the focal length f of the optical image capturing system to a focal length fp of each of lenses with positive refractive power; ΣPPR is a sum of the PPRs; TP1 is a central thickness of the first lens on the optical axis; TP2 is a central thickness of the second lens on the optical axis; TP3 is a central thickness of the third lens on the optical axis; IN12 is a distance on the optical axis between the first lens and the second lens; and IN23 is a distance between the second lens and the third lens.

### Claim 11 (depends on 8)

The optical image capturing system of claim 8, wherein the optical image capturing system further satisfies:
|TDT|<60% and |ODT|≦50%;
where TDT is a TV distortion and ODT is an optical distortion.

### Claim 12 (depends on 8)

The optical image capturing system of claim 8, wherein the optical image capturing system further satisfies:
0 mm<Σ|InRS|≦10 mm

### Claim 13 (depends on 8)

The optical image capturing system of claim 8, wherein the optical image capturing system further satisfies:
0 mm<|InRS21|+|InRS22|+|InRS32|≦8 mm;
where InRS21 is a displacement on the optical axis from a point on the object-side surface of the second lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the second lens; InRS22 is a displacement on the optical axis from a point on the image-side surface of the second lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the image-side surface of the second lens; InRS31 is a displacement on the optical axis from a point on the object-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the third lens; InRS32 is a displacement on the optical axis from a point on the image-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the image-side surface of the third lens.

### Claim 14 (depends on 13)

The optical image capturing system of claim 13, wherein the optical image capturing system further satisfies:
0<(|InRS21|+|InRS22|+|InRS31|+|InRS32|)/InTL≦2.

### Claim 15 (depends on 8)

The optical image capturing system of claim 8, wherein the optical image capturing system further satisfies:
0<(|InRS21|+|InRS22|+|InRS31|+|InRS32|)/HOS≦2.

### Claim 16 (depends on 8)

The optical image capturing system of claim 8, wherein the first lens and the second lens each has at least an inflection point on at least a surface thereof; and the optical image capturing system further satisfies:
where f1 is a focal length of the first length and ΣPP is a sum of focal lengths of the lenses having positive refractive power.

### Claim 17

An optical image capturing system, in order along an optical axis from an object side to an image side, comprising:
a first lens having positive refractive power, wherein the first lens has an object-side surface, which faces the object side, and an image-side surface, which faces the image side, thereof; and an area of the image-side surface of the first lens, where is closed to the optical axis, is convex;
a second lens having negative refractive power;
a third lens having refractive power, wherein the third lens has at least an inflection point on at least one of an object-side surface, which faces the object side, and an image-side surface, which faces the image side, thereof; and
an image plane;
wherein the optical image capturing system consists of the three lenses having refractive power; at least two of the lenses from the first lens to the second lens each has an at least an inflection point on at least a surface thereof; both the object-side surface and the image-side surface of the first lens are aspheric surfaces; and both the object-side surface and the image-side surface of the third lens are aspheric surfaces;
wherein the optical image capturing system satisfies:
1.2≦f/HEP≦3.0; 0.4≦|tan(HAF)|≦1.0; 1.0≦HOS/f≦2.0; |TDT|<60%; |ODT|≦50%; and 0<|InRS|/InTL≦3;
where f1, f2 and f3 are focal lengths of the first lens to the third lens, respectively; f is a focal length of the optical image capturing system; HEP is an entrance pupil diameter of the optical image capturing system; HAF is a half of a view angle of the optical image capturing system; HOS is a distance on the optical axis between an object-side surface, which face the object side, of the first lens and the image plane; TDT is a TV distortion; ODT is an optical distortion; InTL is a distance between the object-side surface of the first lens and the image-side surface of the third lens; and Σ|InRS| is of an sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point to the point at the maximum effective semi diameter, i.e. Σ|InRS|=InRSO+InRSI while InRSO is of a sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point on the object-side surface to the point at the maximum effective semi diameter of the object-side surface and InRSI is of a sum of absolute values of the displacements on the optical axis of each lens with refractive power from the central point on the image-side surface to the point at the maximum effective semi diameter of the image-side surface.

### Claim 18 (depends on 17)

The optical image capturing system of claim 17, further comprising an image sensor on the image plane, wherein the optical image capturing system further satisfies:
0<HOS/HOI≦1.63;
where HOI is a half of a diagonal line of an effective sensing area of the image sensor.

### Claim 19 (depends on 17)

The optical image capturing system of claim 17, wherein the optical image capturing system further satisfies:
0 mm<HOS≦4.5 mm

### Claim 20 (depends on 17)

The optical image capturing system of claim 17, wherein the optical image capturing system further satisfies:
0 mm<|InRS21|+|InRS22|+|InRS31 |+|InRS32|<8 mm;
where InRS21 is a displacement in parallel with the optical axis from a point on the object-side surface of the second lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the second lens; InRS22 is a displacement on the optical axis from a point on the image-side surface of the second lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the image-side surface of the second lens; InRS31 is a displacement on the optical axis from a point on the object-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the object-side surface of the third lens; InRS32 is a displacement on the optical axis from a point on the image-side surface of the third lens, through which the optical axis passes, to a point at the maximum effective semi diameter of the image-side surface of the third lens.

### Claim 21 (depends on 20)

The optical image capturing system of claim 20, wherein the optical image capturing system further satisfies:
0<(|InRS21|+|InRS22|+|InRS31|+|InRS32|)/InTL≦2.

### Claim 22 (depends on 20)

The optical image capturing system of claim 20, further comprising an aperture and an image sensor on the image plane, wherein the image sensor image sensor has at least five million pixels; and the optical image capturing system further satisfies:
0.5≦InS/HOS≦1.1;
where InS is a distance on the optical axis between the aperture and the image plane.