# US 8,786,963 B2 · Imaging lens and imaging apparatus

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- Number: US 8,786,963 B2
- Document ID: US8786963B2
- Status: Granted
- Kind: B2
- Application number: 13/671,997
- Filed: 2012-11-08
- Published: 2013-06-27
- Granted: 2014-07-22
- Earliest claimed: 2011-11-18
- Assignees: Sony Corporation
- Applicants: Sony Corporation
- Inventors: Masaki Tamura
- Web page: https://patentgrep.com/patent/US8786963B2

## CPC

- G02B 13/0045: {having five or more lenses}
- G02B 13/001: {Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens including: in order from an object side thereof, a first lens having a positive refractive power; a second lens formed in a meniscus shape having a negative refractive power with a concave surface faced to an image side; a third lens formed in a biconvex shape having a positive refractive power near an optical axis; a fourth lens formed in a meniscus shape having a positive refractive power with a concave surface faced to the object side near the optical axis; and a fifth lens having a negative refractive power near the optical axis and a positive refractive power in a peripheral portion, the imaging lens satisfying the following conditional expression (a), 3.0≦f3/f4≦30.0 (a) where f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.

## Claims

### Claim 1

An imaging lens comprising: in order from an object side thereof,
a first lens having a positive refractive power;
a second lens formed in a meniscus shape having a negative refractive power with a concave surface faced to an image side;
a third lens formed in a biconvex shape having a positive refractive power near an optical axis;
a fourth lens formed in a meniscus shape having a positive refractive power with a concave surface faced to the object side near the optical axis; and
a fifth lens having a negative refractive power near the optical axis and a positive refractive power in a peripheral portion, the imaging lens satisfying the following conditional expression (a),
3.0≦f3/f4≦30.0 (a)
where
f3 is a focal length of the third lens, and
f4 is a focal length of the fourth lens.

### Claim 2 (depends on 1)

The imaging lens according to claim 1, further satisfying the following conditional expressions (b), (c), (d), and (e):
νd1>50 (b);
νd2<30 (c);
νd3>50 (d); and
νd4>50 (e)
where
νd1 is an Abbe number of the first lens with respect to a d-line (wavelength 587.6 nm),
νd2 is an Abbe number of the second lens with respect to a d-line (wavelength 587.6 nm),
νd3 is an Abbe number of the third lens with respect to a d-line (wavelength 587.6 nm), and
νd4 is an Abbe number of the fourth lens with respect to a d-line (wavelength 587.6 nm).

### Claim 3 (depends on 1)

The imaging lens according to claim 1, further satisfying the following conditional expression (f),
0.4<|f1/f2|<1.2 (f)
where
f1 is a focal length of the first lens, and
f2 is a focal length of the second lens.

### Claim 4 (depends on 1)

The imaging lens according to claim 1, further satisfying the following conditional expressions (g) and (h):
0.2<|f5/f|<1.3 (g); and
νd5>50 (h)
where
f5 is a focal length of the fifth lens,
f is a focal length of an entire lens system including the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, and
νd5 is an Abbe number of the fifth lens with respect to a d-line.

### Claim 5 (depends on 1)

The imaging lens according to claim 1, wherein
the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are constituted of resin-made lenses.

### Claim 6

An imaging apparatus comprising:
an imaging lens including, in order from an object side thereof,
a first lens having a positive refractive power,
a second lens formed in a meniscus shape having a negative refractive power with a concave surface faced to an image side,
a third lens formed in a biconvex shape having a positive refractive power near an optical axis,
a fourth lens formed in a meniscus shape having a positive refractive power with a concave surface faced to the object side near the optical axis, and
a fifth lens having a negative refractive power near the optical axis and a positive refractive power in a peripheral portion; and
an imaging element configured to convert an optical image formed by the imaging lens into an electric signal, the imaging apparatus satisfying the following conditional expression (a),
3.0≦f3/f4 ≦30.0 (a)
where
f3 is a focal length of the third lens, and
f4 is a focal length of the fourth lens.

### Claim 7 (depends on 6)

The imaging apparatus according to claim 6, further satisfying the following conditional expressions (b), (c), (d), and (e):
νd1>50 (b);
νd2<30 (c);
νd3>50 (d); and
νd4>50 (e)
where
νd1 is an Abbe number of the first lens with respect to a d-line (wavelength 587.6 nm),
νd2 is an Abbe number of the second lens with respect to a d-line (wavelength 587.6 nm),
νd3 is an Abbe number of the third lens with respect to a d-line (wavelength 587.6 nm), and
νd4 is an Abbe number of the fourth lens with respect to a d-line (wavelength 587.6 nm).

### Claim 8 (depends on 6)

The imaging apparatus according to claim 6, further satisfying the following conditional expression (f),
0.4<|f1/f2|<1.2 (f)
where
f1 is a focal length of the first lens, and
f2 is a focal length of the second lens.

### Claim 9 (depends on 6)

The imaging apparatus according to claim 6, further satisfying the following conditional expressions (g) and (h):
0.2<|f5/f1 <1.3 (g); and
νd5 >50 (h)
where
f5 is a focal length of the fifth lens,
f is a focal length of an entire lens system including the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, and
νd5 is an Abbe number of the fifth lens with respect to a d-line.

### Claim 10 (depends on 6)

The imaging apparatus according to claim 6, wherein
the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are constituted of resin-made lenses.