# US 10,310,239 B2 · Imaging lens and optical apparatus

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

- Number: US 10,310,239 B2
- Document ID: US10310239B2
- Status: Granted
- Kind: B2
- Application number: 15/830,465
- Filed: 2017-12-04
- Published: 2018-06-07
- Granted: 2019-06-04
- Earliest claimed: 2016-12-07
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Keisuke Harada
- Web page: https://patentgrep.com/patent/US10310239B2

## CPC

- G02B 13/16: for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV}
- G02B 9/64: having more than six components
- G02B 13/0045: {having five or more lenses}
- G02B 13/22: Telecentric objectives or lens systems
- G02B 15/04: by changing a part
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The imaging lens consists of, in order from a magnified side, a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, and a seventh lens having a positive refractive power, and satisfies predetermined Conditional Expressions (1) and (2) relating to Abbe numbers of the second lens to the fifth lens.

## Claims

### Claim 1

An imaging lens consisting of, in order from a magnified side:
a first lens having a positive refractive power;
a second lens having a positive refractive power;
a third lens having a negative refractive power;
a fourth lens having a negative refractive power;
a fifth lens having a positive refractive power;
a sixth lens having a positive refractive power; and
a seventh lens having a positive refractive power,
wherein the following Conditional Expressions (1) and (2) are satisfied,
−50<νd2−νd3<−15 (1)
−80<νd4−νd5<−40 (2)
where νd2 is an Abbe number of the second lens in a d line,
νd3 is an Abbe number of the third lens in the d line,
νd4 is an Abbe number of the fourth lens in the d line,
νd5 is an Abbe number of the fifth lens in the d line, and
wherein the following Conditional Expression (3) is satisfied,
5<|f45/f23|<30 (3),
where f45 is a composite focal length of the fourth lens and the fifth lens in the d line, and
f23 is a composite focal length of the second lens and the third lens in the d line.

### Claim 2 (depends on 1)

The imaging lens according to claim 1,
wherein the following Conditional Expression (4) is satisfied,
6<|f45/f|<40 (4)
where f45 is a composite focal length of the fourth lens and the fifth lens in the d line, and
f is a focal length of the whole system in the d line.

### Claim 3 (depends on 1)

The imaging lens according to claim 1,
wherein the following Conditional Expression (5) is satisfied,
2<f1/f<15 (5)
where f1 is a focal length of the first lens in the d line, and
f is a focal length of the whole system in the d line.

### Claim 4 (depends on 1)

The imaging lens according to claim 1,
wherein the following Conditional Expression (6) is satisfied,
0.5<|(R2+R1)/(R2−R1)|<1.2 (6)
where R2 is a curvature radius of a surface of the first lens on a reduced side, and
R1 is a curvature radius of a surface of the first lens on the magnified side.

### Claim 5 (depends on 1)

The imaging lens according to claim 1,
wherein a surface of the sixth lens on the magnified side and a surface of the seventh lens on the magnified side have convex surfaces thereof directed toward the magnified side.

### Claim 6 (depends on 1)

The imaging lens according to claim 1,
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all single lenses.

### Claim 7 (depends on 1)

The imaging lens according to claim 1,
wherein the following Conditional Expression (1-1) is satisfied,
−50<νd2−νd3<−20 (1-1).

### Claim 8 (depends on 1)

The imaging lens according to claim 1,
wherein the following Conditional Expression (1-2) is satisfied,
−40<νd2−νd3<−22 (1-2).

### Claim 9 (depends on 1)

The imaging lens according to claim 1,
wherein the following Conditional Expression (2-1) is satisfied,
−70<νd4−νd5<−42 (2-1).

### Claim 10 (depends on 2)

The imaging lens according to claim 2,
wherein the following Conditional Expression (4-1) is satisfied,
7<|f45/f|<30 (4-1).

### Claim 11 (depends on 3)

The imaging lens according to claim 3,
wherein the following Conditional Expression (5-1) is satisfied,
2.5<f1/f<10 (5-1).

### Claim 12 (depends on 4)

The imaging lens according to claim 4,
wherein the following Conditional Expression (6-1) is satisfied,
0.6<|(R2+R1)/(R2−R1)|<1.2 (6-1).

### Claim 13 (depends on 1)

An optical apparatus comprising the imaging lens according to claim 1.