# US 9,753,257 B2 · Imaging lens and imaging apparatus equipped with the imaging lens

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- Number: US 9,753,257 B2
- Document ID: US9753257B2
- Status: Granted
- Kind: B2
- Application number: 14/940,145
- Filed: 2015-11-13
- Published: 2016-05-19
- Granted: 2017-09-05
- Earliest claimed: 2014-11-17
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Takuya Tanaka
- Web page: https://patentgrep.com/patent/US9753257B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 9/64: having more than six components
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens consisting essentially of, in order from the object side, a first lens having a negative refractive power with the object side surface having a concave shape, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having a negative refractive power with the image side surface having a concave shape with at least one inflection point, in which an aperture stop is provided between the first lens and the fifth lens, and the imaging lens satisfies predetermined conditional expressions. One of the second lens and the third lens has a positive refractive power and the other has a negative refractive power, and one of the fifth lens and the sixth lens has a positive refractive power and the other has a negative refractive power.

## Claims

### Claim 1

An imaging lens consisting of seven lenses, composed of, in order from the object side, a first lens having a negative refractive power with the object side surface having a concave shape, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having a negative refractive power with the image side surface having a concave shape with at least one inflection point located radially inward of the intersection between the image side surface and the principal ray of the maximum angle of view, wherein:
an aperture stop is provided between the first lens and the fifth lens;
one of the second lens and the third lens has a positive refractive power and the other of the second lens and the third lens has a negative refractive power;
one of the fifth lens and the sixth lens has a positive refractive power and the other of the fifth lens and the sixth lens has a negative refractive power;
and the following conditional expressions are satisfied:
30<νP1−νN1<50 (1)
30<νP2−νN2<50 (2)
where
νP1 is the Abbe number of either one of the second lens and the third lens having a positive refractive power with respect to the d-line;
νN1 is the Abbe number of either one of the second lens and the third lens having a negative refractive power with respect to the d-line;
νP2 is the Abbe number of either one of the fifth lens and the sixth lens having a positive refractive power with respect to the d-line; and
νN2 is the Abbe number of either one of the fifth lens and the sixth lens having a negative refractive power with respect to the d-line.

### Claim 2 (depends on 1)

The imaging lens of claim 1, wherein the aperture stop is located between the third lens and the fourth lens, or between the fourth lens and the fifth lens.

### Claim 3 (depends on 1)

The imaging lens of claim 1, wherein the fifth lens has a negative refractive power and the sixth lens has a positive refractive power.

### Claim 4 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
0<f/f67<2 (3)
where:
f is the focal length of the entire system; and
f67 is the combined focal length of the sixth lens and the seventh lens.

### Claim 5 (depends on 1)

The imaging lens of claim 1, wherein the sixth lens has a biconvex shape.

### Claim 6 (depends on 1)

The imaging lens of claim 1, wherein the seventh lens has a biconcave shape.

### Claim 7 (depends on 1)

The imaging lens of claim 1, wherein the second lens has a positive refractive power and the third lens has a negative refractive power.

### Claim 8 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
0<f/f12<2 (4)
where:
f is the focal length of the entire system; and
f12 is the combined focal length of the first lens and the second lens.

### Claim 9 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
0.1<D2/(f·tan ω)<0.3 (5)
where:
D2 is the distance between the first lens and the second lens on the optical axis;
f is the focal length of the entire system; and
ω is the maximum half angle of view when an object at infinity is in focus.

### Claim 10 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
−2<f/f1<0 (6)
where:
f is the focal length of the entire system; and
f1 is the focal length of the first lens.

### Claim 11 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
−3<f/f7<0 (7)
where:
f is the focal length of the entire system; and
f7 is the focal length of the seventh lens.

### Claim 12 (depends on 1)

The imaging lens of claim 1, wherein the fourth lens has a positive refractive power.

### Claim 13 (depends on 1)

The imaging lens of claim 1, wherein the object side surface of the first lens has at least one inflection point located radially inward of the intersection between the object side surface and the principal ray of the maximum angle of view.

### Claim 14 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
30<νP1−νN1<40 (1-1).

### Claim 15 (depends on 1)

The imaging lens of claim 1, wherein the following conditional expression is further satisfied:
30<νP2−νN2<40 (2-1).

### Claim 16 (depends on 4)

The imaging lens of claim 4, wherein the following conditional expression is further satisfied:
0<f/f67<1 (3-1)
where:
f is the focal length of the entire system; and
f67 is the combined focal length of the sixth lens and the seventh lens.

### Claim 17 (depends on 8)

The imaging lens of claim 8, wherein the following conditional expression is further satisfied:
0<f/f12<1 (4-1)
where:
f is the focal length of the entire system; and
f12 is the combined focal length of the first lens and the second lens.

### Claim 18 (depends on 10)

The imaging lens of claim 10, wherein the following conditional expression is further satisfied:
−1<f/f1<0 (6-1)
where:
f is the focal length of the entire system; and
f1 is the focal length of the first lens.

### Claim 19 (depends on 11)

The imaging lens of claim 11, wherein the following conditional expression is further satisfied:
−2.5<f/f7<−1 (7-1)
where:
f is the focal length of the entire system; and
f7 is the focal length of the seventh lens.

### Claim 20 (depends on 1)

An imaging apparatus equipped with the imaging lens of claim 1.