# US 9,519,123 B2 · Imaging lens and imaging apparatus

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

- Number: US 9,519,123 B2
- Document ID: US9519123B2
- Status: Granted
- Kind: B2
- Application number: 14/855,405
- Filed: 2015-09-16
- Published: 2016-03-24
- Granted: 2016-12-13
- Earliest claimed: 2014-09-19
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Taro Asami
- Web page: https://patentgrep.com/patent/US9519123B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/64: having more than six components
- G02B 13/04: Reversed telephoto objectives
- G02B 27/0025: {for optical correction, e.g. distorsion, aberration}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens consists of, in order from the object, a negative first lens, a positive second lens, a positive third lens, a negative fourth lens, a positive fifth lens, a positive sixth lens, and a negative seventh lens. When νd7 is the Abbe's number of the material for the seventh lens, f is the focal length of the entire system, and f5 is the focal length of the fifth lens, the following conditional formulae are satisfied: νd7<55 (2) 1.25<f5/f (10).

## Claims

### Claim 1

An imaging lens consisting of, in order from the object side, a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, a sixth lens having a positive power, and a seventh lens having a negative power, wherein
the following conditional formulae are satisfied:
νd7<55 (2)
1.25<f5/f (10)
where,
νd7 is the Abbe's number of the material of the seventh lens with respect to the d line,
f is the focal length of the entire system, and
f5 is the focal length of the fifth lens.

### Claim 2 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
40<νd3 (3)
where,
νd3 is the Abbe's number of the material for the third lens with respect to the d line.

### Claim 3 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
25<νd5 (13)
where,
νd5 is the Abbe's number of the material for the fifth lens with respect to the d line.

### Claim 4 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
0.5<f3/f<10 (14)
where,
f3 is the focal length of the third lens, and
f is the focal length of the entire system.

### Claim 5 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
0.5<f2/f<7 (15)
where,
f2 is the focal length of the second lens, and
f is the focal length of the entire system.

### Claim 6 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is satisfied:
f1/f<−0.25 (16)
where,
f1 is the focal length of the first lens, and
f is the focal length of the entire system.

### Claim 7 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is satisfied:
0.3<f123/f<15 (17)
where,
f123 is the combined focal length of the first lens, the second lens, and the third lens, and
f is the focal length of the entire system.

### Claim 8 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
0.5<f234/f<18 (18)
where,
f234 is the combined focal length of the second lens, the third lens, and the fourth lens, and
f is the focal length of the entire system.

### Claim 9 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
0.5<f12345/f<10 (19)
where,
f12345 is the combined focal length of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, and
f is the focal length of the entire system.

### Claim 10 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
−5.0<(R14+R15)/(R14−R15)<−0.01 (8)
where,
R14 is the radius of curvature of the object-side surface of the seventh lens, and
R15 is the radius of curvature of the image-side surface of the seventh lens.

### Claim 11 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
0.4<f2345/f<10 (20)
where,
f2345 is the combined focal length of the second lens, the third lens, the fourth lens, and the fifth lens, and
f is the focal length of the entire system.

### Claim 12 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
0.1<f3456/f<5.0 (21)
where,
f3456 is the combined focal length of the third lens, the fourth lens, the fifth lens, and the sixth lens, and
f is the focal length of the entire system.

### Claim 13 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
−4.0<(R8+R9)/(R8−R9)<4.0 (22)
where,
R8 is the radius of curvature of the object-side surface of the fourth lens, and
R9 is the radius of curvature of the image-side surface of the fourth lens.

### Claim 14 (depends on 1)

The imaging lens as defined in claim 1, wherein the following conditional formula is further satisfied:
−3<f/f45<3 (23)
where,
f45 is the combined focal length of the fourth lens and the fifth lens, and
f is the focal length of the entire system.

### Claim 15 (depends on 1)

An imaging apparatus equipped with the imaging lens as defined in claim 1.

### Claim 16

An imaging lens consisting of, in order from the object side, a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, a sixth lens having a positive power, and a seventh lens having a negative power, wherein
the following conditional formulae are satisfied:
νd7<55 (2)
D4/f<0.39 (4)
0.65<(R10+R11)/(R10−R11) (11-1)
where,
νd7 is the Abbe's number of the material of the seventh lens with respect to the d line,
f is the focal length of the entire system,
D4 is the air space between the second lens and the third lens,
R10 is the radius of curvature of the object-side surface of the fifth lens, and
R11 is the radius of curvature of the image-side surface of the fifth lens.

### Claim 17

An imaging lens consisting of, in order from the object side, a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, a sixth lens having a positive power, and a seventh lens having a negative power, wherein
the following conditional formulae are satisfied:
D4/f<0.39 (4)
0.5<(R10+R11)/(R10−R11) (11)
(R12+R13)/(R12−R13)<1.0 (12)
where,
f is the focal length of the entire system,
D4 is the air space between the second lens and the third lens,
R10 is the radius of curvature of the object-side surface of the fifth lens,
R11 is the radius of curvature of the image-side surface of the fifth lens,
R12 is the radius of curvature of the object-side surface of the sixth lens, and
R13 is the radius of curvature of the image-side surface of the sixth lens.