# US 2010/0165484 A1 · Imaging module with high resolution and compact size

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- Number: US 2010/0165484 A1
- Document ID: US20100165484A1
- Status: Published application
- Kind: A1
- Application number: 12/417,619
- Filed: 2009-04-02
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Inventors: CHUN-YI YIN; CHUN-HSIANG HUANG
- Web page: https://patentgrep.com/patent/US20100165484A1

## CPC

- G02B 13/004: {having four lenses}
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B 13/22: Telecentric objectives or lens systems
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens includes an imaging lens system and an image sensor. The imaging lens system includes a first lens, a second lens, a third lens, and a fourth lens. The imaging module satisfies the formulae (1) D/T≧1.1, (2) −3.5<R2/F1<−1.5, (3) −2.5<R3/F2<−0.5, and (4) 1.5<|R7/F4|<3.5, wherein D is the diagonal length of the sensing area of the image sensor, T is the length from the object surface of the first lens to the sensing surface of the image sensor, R2 is the radius of curvature of the image side surface of the first lens, R3 is the radius of curvature of the object side surface of the second lens, R7 is the radius of curvature of the object side surface of the fourth lens, F1, F2, F4 are the corresponding focal length of the first lens, the second lens, and the third lens.

## Claims

### Claim 1

An imaging module comprising,
an imaging lens system comprising, in the order from the object side to the image side thereof, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power, and a fourth lens of negative refraction power; and
an image sensor placed aligned with the imaging lens system and placed at the image side of the imaging lens system,
wherein the imaging module satisfying the formulas:
D/T≧1.1,
−3.5<R2/F1<1.5,
−2.5<R3/F2<−0.5, and
1.5<|R7/F4|<3.5,
wherein D is the diagonal length of the sensing area of the image sensor, T is the length from the object surface of the first lens to the sensing surface of the image sensor, R2 is the radius of curvature of the image side surface of the first lens, F1 is the focal length of the first lens, R3 is the radius of curvature of the object side surface of the second lens, F2 is the focal length of the second lens, R7 is the radius of curvature of the object side surface of the fourth lens, F4 is the focal length of the fourth lens.

### Claim 2 (depends on 1)

The imaging lens as claimed in claim 1, wherein the first, second, third and fourth lenses are made of plastic.

### Claim 3 (depends on 1)

The imaging module as claimed in claim 1, wherein the imaging module further comprises an aperture stop disposed between the first lens and the second lens.

### Claim 4 (depends on 1)

The imaging module as claimed in claim 1, wherein the imaging module further satisfies the formulae:
n2>1.58,
wherein the n2 is the refractive index of the second lens.

### Claim 5 (depends on 1)

The imaging module as claimed in claim 1, wherein the imaging module further satisfies the formulas:
Vd1>55; and
Vd2<35,
wherein Vd1 is the Abbe number of the first lens and Vd2 is the Abbe number of the second lens.

### Claim 6 (depends on 4)

The imaging module as claimed in claim 4, wherein the imaging module further satisfies the formulas:
Vd1>55; and
Vd2<35,
wherein Vd1 is the Abbe number of the first lens and Vd2 is the Abbe number of the second lens.

### Claim 7 (depends on 1)

The imaging module as claimed in claim 1, wherein the first, second, third and fourth lenses are aspherical lenses.

### Claim 8 (depends on 1)

The imaging module as claimed in claim 1, wherein the third lens is crescent-shaped and convex to the image side.

### Claim 9 (depends on 1)

The imaging module as claimed in claim 1, wherein a cover glass is positioned between the image lens system and the image sensor for protecting the sensing area of the image sensor.