# US 7,466,497 B2 · Optical imaging system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,466,497 B2
- Document ID: US7466497B2
- Status: Granted
- Kind: B2
- Application number: 11/473,154
- Filed: 2006-06-21
- Published: 2007-01-11
- Granted: 2008-12-16
- Earliest claimed: 2005-07-07
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Seong-Ha Park; Ki-Tae Kim
- Web page: https://patentgrep.com/patent/US7466497B2

## CPC

- G02B 13/004: {having four lenses}
- G02B 9/34: having four components only
- G02B 9/36: arranged + -- +
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical imaging system is provided comprising a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive or negative power; and a fourth lens group having a positive or negative power.

## Claims

### Claim 1

An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power closest to a subject;
a second lens group closest to the first lens group and having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power,
wherein each of the first to fourth lens groups comprises an aspheric lens having at least one aspheric surface thereof; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.

### Claim 2 (depends on 1)

An optical imaging system according to claim 1, wherein the first lens group comprises at least one lens of a positive refractive power.

### Claim 3 (depends on 1)

An optical imaging system according to claim 1, wherein the second lens group comprises at least one lens of a negative refractive power.

### Claim 4 (depends on 1)

An optical imaging system according to claim 1, wherein the third lens group comprises at least one lens of a positive or negative refractive power.

### Claim 5 (depends on 1)

An optical imaging system according to claim 1, wherein a fourth lens group comprises at least one lens of a positive or negative refractive power.

### Claim 6 (depends on 1)

An optical imaging system according to claim 1, wherein the optical imaging system satisfies
0.3
<
f
1
f
<
3.1
,
wherein f denotes synthetic focus distance of the optical imaging system and f1 denotes focus distance of the first lens group.

### Claim 7 (depends on 1)

An optical imaging system according to claim 1, wherein the optical imaging system satisfies
0.3
<

f
2

f
<
8.99
,
wherein f denotes a synthetic focus distance of the optical imaging system and f2 denotes a focus distance of the second lens group.

### Claim 8 (depends on 1)

An optical imaging system according to claim 1, wherein the optical imaging system satisfies
0.19
<
f
3
f
<
∞
,
wherein f denotes a synthetic focus distance of the optical imaging system and f3 denotes a focus distance of the third lens group.

### Claim 9 (depends on 1)

An optical imaging system according to claim 1, wherein the optical imaging system satisfies
0.15
<

f
4

f
<
∞
,
wherein f denotes a synthetic focus distance of the optical imaging system and f4 denotes a focus distance of the second lens group.

### Claim 10

An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power, wherein the optical imaging system satisfies
0.45
<
f
TTL
<
1.01
,
wherein f denotes a synthetic focus distance of die optical imaging system and TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.

### Claim 11 (depends on 10)

An optical imaging system according to claim 10, further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.

### Claim 12

An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power, wherein the first and second lens groups satisfy an optical axis direction size according to
0
<
d
1
TTL
<
0.26
,
wherein d1 denotes a separated distance between the first lens group and the second lens group on the optical axis and TTL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.

### Claim 13 (depends on 12)

An optical imaging system according to claim 12, further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.

### Claim 14

An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power;
a second lens group having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power, wherein the third and fourth lens groups satisfy an optical axis direction size according to
0
<
d
3
TTL
<
0.40
,
wherein d3 denotes a separated distance between the third lens group and the fourth lens group on the optical axis and TIL denotes a distance from an iris surface to an imaging surface;
wherein a lens located in the first lens group and having at least one aspheric surface; and
one of a thin film filter or an optical filter for restricting the transmission of a portion of light between the second and third lens groups or between the third and fourth lens groups.

### Claim 15 (depends on 14)

An optical imaging system according to claim 14, further comprising a parallel flat glass disposed between the image sensor and the fourth lens group.

### Claim 16

An optical imaging system comprising an image sensor for photoelectric conversion, the optical imaging system further comprising:
a first lens group having a positive refractive power closest to a subject;
a second lens group closest to the first lens group and having a negative refractive power;
a third lens group having one of a positive or negative power; and
a fourth lens group having one of a positive or negative power,
wherein each of the first to fourth lens groups comprises an aspheric lens having at least one aspheric surface thereof, and
wherein the Abbe's numbers of the first and second lens groups G1 and G2 satisfy
28.2<υ1−υ2<42.8,
wherein υ1 and υ2 denote Abbe's numbers representing the distribution characteristics of the first and second lens groups respectively.