Camera lens

TECHNICAL FIELD

The present disclosure relates to a camera lens, and in particular to a camera lens which is suitable for use in a portable modular camera, a WEB camera or the like using a camera element such as a high-pixel CCD or CMOS, has good optical properties, has a full angle of view (hereinafter, referred to as 2ω) being a narrow angle lower than 20°, and includes five lenses.

BACKGROUND

In recent years, various types of camera devices equipped with a camera element such as a CCD and CMOS and others have been widely used. Along with the development of miniaturization and high performance of camera elements, camera lenses with good optical properties and a narrow angle are needed.

The technology related to the camera lens composed of five lenses with a narrow angle and good optical properties is being developed gradually.

A camera lens constituted of five lenses has been proposed, which includes from an object side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; and a fifth lens having a negative refractive power, but 2ω=51.75°, and the narrow angle is not sufficient.

Another camera lens constituted of five lenses has been proposed, which includes from an object side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; and a fifth lens having a negative refractive power, but 2ω≥37.00°, and the narrow angle is not sufficient.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a structural diagram of a camera lens LA according to an embodiment of the present disclosure.

FIG. 2 is a structural diagram of the above-described camera lens LA according to Embodiment 1.

FIG. 3 is a diagram of a spherical aberration of the camera lens LA of Embodiment 1.

FIG. 4 is a diagram of a magnification chromatic aberration of the camera lens LA of Embodiment 1.

FIG. 5 is a diagram of field curvature and distortion of the camera lens LA of Embodiment 1.

FIG. 6 is a structural diagram of the above-described camera lens LA according to Embodiment 2.

FIG. 7 is a diagram of a spherical aberration of the camera lens LA of Embodiment 2.

FIG. 8 is a diagram of a magnification chromatic aberration of the camera lens LA of Embodiment 2.

FIG. 9 is a diagram of field curvature and distortion of the camera lens LA of Embodiment 2.

FIG. 10 is a structural diagram of the above-described camera lens LA according to Embodiment 3.

FIG. 11 is a diagram of a spherical aberration of the camera lens LA of Embodiment 3.

FIG. 12 is a diagram of a magnification chromatic aberration of the camera lens LA of Embodiment 3.

FIG. 13 is a diagram of field curvature and distortion of the camera lens LA of Embodiment 3.

FIG. 14 is a structural diagram of the above-described camera lens LA according to Embodiment 4.

FIG. 15 is a diagram of a spherical aberration of the camera lens LA of Embodiment 4.

FIG. 16 is a diagram of a magnification chromatic aberration of the camera lens LA of Embodiment 4.

FIG. 17 is a diagram of field curvature and distortion of the camera lens LA of Embodiment 4.

FIG. 18 is a structural diagram of the above-described camera lens LA according to Embodiment 5.

FIG. 19 is a diagram of a spherical aberration of the camera lens LA of Embodiment 5.

FIG. 20 is a diagram of a magnification chromatic aberration of the camera lens LA of Embodiment 5.

FIG. 21 is a diagram of field curvature and distortion of the camera lens LA of Embodiment 5.

DESCRIPTION OF EMBODIMENTS

An embodiment of a camera lens according to the present disclosure will be described with reference to the drawings. A diagram showing a structure of the camera lens according to the embodiment of the present disclosure is as shown in FIG. 1. The camera lens LA has a five-lens system which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5, which are arranged from an object side towards an image side. Glass plates GF1 and GP2 are provided between the fifth lens L5 and an imaging plane. The glass plates GF1 and GF2 can be glass plates each using a cover glass or having an IR cut-off filter and other functions. In addition, there may be no glass plates GF1 and GF2 provided between the fifth lens L5 and the imaging plane.

The first lens L1 is a lens having a positive refractive power, the second lens L2 is a lens having a negative refractive power, the third lens L3 is a lens having a positive refractive power, the fourth lens L4 is a lens having a positive refractive power, and the fifth Lens L5 is a lens having a positive refractive power. With respect to the lens surfaces of these five lenses, it is preferable to make them be aspheric surfaces in order to satisfactorily correct various aberrations.

The camera lens LA satisfies the following relational expressions (1) to (2):

7.00≤(f1+f3+f4+f5)/f≤12.00 (1);
−0.45≤f2/f≤−0.30 (2), and

in which:

f denotes an overall focal length of the lens system,
f1 denotes a focal length of the first lens;
f2 denotes a focal length of the second lens;
f3 denotes a focal length of the third lens;
f4 denotes a focal length of the fourth lens; and
f5 denotes a focal length of the fifth lens.

The relational expression (1) specifies a ratio of a sum of the focal length f1 of the first lens L1, the focal length f3 of the third lens L3, the focal length f4 of the fourth lens L4 and the focal length f5 of the fifth lens L5 to the overall focal length f of the lens system. Within the range of the relational expression (1), it is more advantageous to achieve narrow angles with good optical characteristics.

The relational expression (2) specifies a ratio of the focal length f2 of the second lens L2 to the overall focal length f of the lens system. Within the range of the relational expression (2), it is more advantageous to achieve narrow angles with good optical characteristics.

In the camera lens according to the present embodiment, the first lens L1 is a lens having a positive refractive power, the second lens L2 is a lens having a negative refractive power, and the following relational expression (3) is satisfied:

−2.00≤f1/f2≤−1.45 (3),

where

f1 denotes a focal length of the first lens L1; and
f2 denotes a focal length of the second lens L2.

The relational expression (3) specifies a ratio of the focal length f1 of the first lens L1 to the focal length f2 of the second lens L2. Within the range of the relational expression (3), it is more advantageous to achieve narrow angles with good optical characteristics.

In the camera lens according to the present embodiment, the first lens L1 is a lens having a positive refractive power, and the following relational expression (4) is satisfied:

−0.20≤R1/R2≤−0.08 (4),

where

R1 is a curvature radius of an object side surface of the first lens L1; and
R2 is a curvature radius of an image side surface of the first lens L2.

The relational expression (4) specifies a ratio of the curvature radius R1 of the object side surface of the first lens L1 to the curvature radius R2 of the image side surface of the first lens L1. Within the range of the relational expression (4), it is more advantageous to achieve narrow angles with good optical characteristics.

In the camera lens according to the present embodiment, the second lens L2 is a lens having a negative refractive power, and the following relational expression (5) is satisfied:

0.10≤R3/R4≤0.25 (5),

where

R3 is a curvature radius of an object side surface of the second lens L2; and
R4 is a curvature radius of an image side surface of the second lens L2.

The relational expression (5) specifies a ratio of the curvature radius R3 of the object side surface of the second lens L2 to the curvature radius R4 of the image side surface of the second lens L2. Within the range of the relational expression (5), it is more advantageous to achieve narrow angles with good optical characteristics.

In the camera lens according to the present embodiment, the third lens L3 is a lens having a negative refractive power, and the following relational expression (6) is satisfied:

−0.35≤R5/R6≤−0.05 (6),

where

R5 is a curvature radius of an object side surface of the third lens L3; and
R6 is a curvature radius of an image side surface of the third lens L3.

The relational expression (6) specifies a ratio of the curvature radius R5 of the object side surface of the third lens L3 to the curvature radius R6 of the image side surface of the third lens L3. Within the range of the relational expression (6), it is more advantageous to achieve narrow angles with good optical characteristics.

Each of the five lenses constituting the camera lens LA satisfies the structure and relational expression described above, and it is possible to obtain a camera lens which has a narrow angle and good optical properties.

EMBODIMENTS

f: the overall focal length of the camera lens LA;

f1: the focal length of the first lens L1;

f2: the focal length of the second lens L2;

f3: the focal length of the third lens L3;

f4: the focal length of the fourth lens L4;

f5: the focal length of the fifth lens L5;

Fno: F-number;

2ω: full angle of view;

STOP: open aperture;

R: the curvature radius of the optical surface, which is the center curvature radius of the lens;

R1: the curvature radius of the object side surface of the first lens L1;

R2: the curvature radius of the image side surface of the first lens L1;

R3: the curvature radius of the object side surface of the second lens L2;

R4: the curvature radius of the image side surface of the second lens L2;

R5: the curvature radius of the object side surface of the third lens L3;

R6: the curvature radius of the image side surface of the third lens L3;

R7: the curvature radius of the object side surface of the fourth lens L4;

R8: the curvature radius of the image side surface of the fourth lens L4;

R9: the curvature radius of the object side surface of the fifth lens L5;

R10: the curvature radius of the image side surface of the fifth lens L5;

R11: the curvature radius of the object side surface of the glass plate GF1;

R12: the curvature radius of the image side surface of the glass plate GF1;

R13: the curvature radius of the object side surface of the glass plate GF2;

R14: the curvature radius of the image side surface of the glass plate GF2;

d: the center thickness of the lens or the distance between the lenses;

d1: the center thickness of the first lens L1;

d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

d3: the center thickness of the second lens L2;

d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

d5: the center thickness of the third lens L3;

d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

d7: the center thickness of the fourth lens L4;

d8: the axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

d9: the center thickness of the fifth lens L5;

d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the glass plate GF1;

d11: the center thickness of the glass plate GF1;

d12: the axial distance from the image side surface of the glass plate GF1 to the object side surface of the glass plate GF12;

d13: the center thickness of the glass plate GF12;

d14: the axial distance from the image side surface of the glass plate GF2 to the imaging plane;

nd: the refractive index of line d;

nd1: the refractive index of lined of the first lens L1;

nd2: the refractive index of line d of the second lens L2;

nd3: the refractive index of line d of the third lens L3;

nd4: the refractive index of line d of the fourth lens L4;

nd5: the refractive index of line d of the fifth lens L5;

nd6: the refractive index of line d of the glass plate GF1;

nd7: the refractive index of line d of the glass plate GF2;

ν: the Abbe number;

ν1: the Abbe number of the first lens L1;

ν2: the Abbe number of the second lens L2;

ν3: the Abbe number of the third lens L3;

ν4: the Abbe number of the fourth lens L4;

ν5: the Abbe number of the fifth lens L5;

ν6: the Abbe number of the glass plate GF1;

ν7: the Abbe number of the glass plate GF2;

TTL: optical length (the axial distance from the object side surface of the first lens L1 to the imaging plane);

LB: the axial distance from the image side surface of the fifth lens L5 to the imaging plane (including thicknesses of the glass plates GF1 and GF2); and

IH: image height.

y=(x²/R)/[1+{1−(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴ (7)

R is the axial curvature radius, k is the conic coefficient, and A4, A6, A8, A10, A12 and A14 are aspheric coefficients.

For the sake of convenience, the aspheric surface represented by the relational expression (7) is used as an aspheric surface of each of the lenses. However, the present disclosure is not limited to the aspheric surface represented by the relational expression (7).

Embodiment 1

FIG. 2 is a structural diagram of the camera lens LA of Embodiment 1. Each of the first lens L1 to the fifth lens L5 constituting the camera lens LA of Embodiment 1 has a curvature radius R of the object side and image side, a center thickness of the lens or a distance d between the lenses, a refractive index nd and an Abbe number νd as shown in Table 1, a conic coefficient k and an aspheric coefficient as shown in Table 2, and 2ω, Fno, f, f1, f2, f3, f4, f5, TTL and IH as shown in Table 3.

TABLE 1

Effective

Radius

R (mm)
d (mm)
nd
νd
(mm)

R1
6.0971
d1
4.192
nd1
1.5439
ν1
55.95
3.488

R2
−33.8729
d2
1.726

2.770

R3
−3.4779
d3
0.608
nd2
1.6606
ν2
20.40
2.154

R4
−18.6600
d4
0.142

2.062

STOP
∞

0.911

2.020

R5
19.5727
d5
0.505
nd3
1.6606
ν3
20.40
2.044

R6
−150.5595
d6
0.191

2.050

R7
−11.6730
d7
0.354
nd4
1.6150
ν4
25.92
2.049

R8
−8.5682
d8
0.050

2.026

R9
5.4842
d9
2.413
nd5
1.5439
ν5
55.95
2.076

R10
5.7120
d10
0.500

2.031

R11
∞
d11
6.000
nd6
1.7725
ν6
49.60
2.052

R12
∞
d12
1.514

2.384

R13
∞
d13
0.210
nd7
1.5168
ν7
64.17
2.534

R14
∞
d14
1.050

2.548

TABLE 2

Conic

coefficient
Aspheric coefficient

k
A4
A6
A8
A10
A12
A14

R1
0.0000E+00
7.2816E−07
4.3222E−06
−4.5084E−07
0.0000E+00
0.0000E+00
0.0000E+00

R2
0.0000E+00
1.6177E−03
−1.4425E−04
3.6718E−06
0.0000E+00
0.0000E+00
0.0000E+00

R3
−1.3727E+01
6.8812E−03
−5.2761E−03
1.3593E−03
−1.7636E−04
9.3101E−06
0.0000E+00

R4
0.0000E+00
4.4010E−02
−2.1327E−02
5.8907E−03
−9.9275E−04
9.2575E−05
−3.7060E−06

R5
0.0000E+00
1.7661E−02
−2.9537E−03
−3.9329E−03
1.6534E−03
−2.4322E−04
1.2047E−05

R6
0.0000E+00
−3.0496E−02
3.8217E−02
−2.2730E−02
6.5018E−03
−8.8667E−04
4.6794E−05

R7
0.0000E+00
−6.4195E−02
7.2619E−02
−3.3743E−02
8.3180E−03
−1.0623E−03
5.4614E−05

R8
−2.1380E+00
−2.1982E−02
3.1169E−02
−1.3072E−02
2.6964E−03
−2.9564E−04
1.3248E−05

R9
3.9513E+00
−1.1452E−02
2.2362E−03
−1.4785E−03
3.9142E−04
−5.8130E−05
3.2430E−06

R10
5.0606E+00
−8.6214E−03
−9.9414E−04
6.4323E−04
−2.8055E−04
5.4493E−05
−4.8542E−06

TABLE 3

2ω (°)
18.00

Fno
2.50

f (mm)
16.444

f1 (mm)
9.865

f2 (mm)
−6.576

f3 (mm)
26.254

f4 (mm)
50.200

f5 (mm)
53.429

TTL (mm)
20.367

LB (mm)
9.274

IH (mm)
2.619

Table 16 below shows the numerical values defined in Embodiments 1 to 5 and the numerical values corresponding to the parameters specified by the relational expressions (1) to (6).

As shown in Table 16, Embodiment 1 satisfies the relational expressions (1) to (6).

The spherical aberration of the camera lens LA of Embodiment 1 is as shown in FIG. 3, the magnification chromatic aberration of magnification thereof is as shown in FIG. 4, and the field curvature and the distortion are as shown in FIG. 5. Furthermore, the field curvature S in FIG. 5 is the field curvature for the sagittal imaging plane, and T is the field curvature for the meridianal imaging plane, and the same applies to Embodiments 2 to 5. As shown in Table 3, the camera lens LA of Embodiment 1 has a narrow angle. As can be seen from FIGS. 3 to 5, the camera lens LA of Embodiment 1 has good optical properties.

Embodiment 2

FIG. 6 is a structural diagram of the camera lens LA of Embodiment 2. Each of the first lens L1 to the fifth lens L5 constituting the camera lens LA of Embodiment 2 has a curvature radius R of the object side and image side, a center thickness of the lens or a distance d between the lenses, a refractive index nd and an Abbe number vd as shown in Table 4, a conic coefficient k and an aspheric coefficient as shown in Table 5, and 2ω, Fno, f, f1, f2, f3, f4, f5, TTL and IH as shown in Table 6.

TABLE 4

Effective

Radius

R (mm)
d (mm)
nd
νd
(mm)

R1
5.8736
d1
4.598
nd1
1.5439
ν1
55.95
3.558

R2
−57.1741
d2
1.330

2.642

R3
−3.4985
d3
0.488
nd2
1.6606
ν2
20.40
2.189

R4
−19.0674
d4
0.373

2.107

STOP
∞

0.173

2.036

R5
15.4276
d5
0.669
nd3
1.6606
ν3
20.40
2.066

R6
−45.3972
d6
0.515

2.029

R7
−4.3454
d7
0.487
nd4
1.6150
ν4
25.92
2.000

R8
−4.2288
d8
0.050

2.016

R9
5.7136
d9
2.231
nd5
1.5439
ν5
55.95
2.050

R10
5.9139
d10
0.500

2.013

R11
∞
d11
6.000
nd6
1.7725
ν6
49.60
2.034

R12
∞
d12
1.833

2.362

R13
∞
d13
0.210
nd7
1.5168
ν7
64.17
2.540

R14
∞
d14
1.050

2.553

TABLE 5

Conic

coefficient
Aspheric coefficient

k
A4
A6
A8
A10
A12
A14

R1
0.0000E+00
−4.8363E−05
7.3906E−06
−1.0729E−07
0.0000E+00
0.0000E+00
0.0000E+00

R2
0.0000E+00
−3.9287E−04
1.7018E−04
−1.3108E−05
0.0000E+00
0.0000E+00
0.0000E+00

R3
−1.1254E+01
3.7449E−03
−6.2480E−03
2.2916E−03
−3.6772E−04
2.1826E−05
0.0000E+00

R4
0.0000E+00
4.5501E−02
−2.4999E−02
6.9076E−03
−9.0705E−04
3.8104E−05
1.0180E−06

R5
0.0000E+00
2.1143E−02
−1.2668E−02
1.8083E−03
3.0569E−04
−9.2082E−05
6.0773E−06

R6
0.0000E+00
−2.7968E−04
−2.8025E−03
−1.1845E−04
3.7203E−04
−7.1450E−05
4.5193E−06

R7
0.0000E+00
−1.1893E−03
6.4305E−03
−4.4240E−03
1.6371E−03
−3.2134E−04
2.4943E−05

R8
−1.6304E+00
1.1861E−02
−5.5245E−03
1.7742E−03
−1.9042E−04
−2.3993E−05
4.6819E−06

R9
5.2707E+00
1.4485E−03
−1.2074E−02
6.2051E−03
−1.7497E−03
2.5991E−04
−1.7064E−05

R10
6.1276E+00
−8.7444E−03
−9.2532E−04
7.9874E−04
−3.9218E−04
8.5660E−05
−8.5218E−06

TABLE 6

2ω (°)
18.00

Fno
2.50

f (mm)
16.439

f1 (mm)
10.051

f2 (mm)
−6.569

f3 (mm)
17.509

f4 (mm)
98.896

f5 (mm)
62.996

TTL (mm)
20.508

LB (mm)
9.593

IH (mm)
2.619

As shown in Table 16, Embodiment 2 satisfies the relational expressions (1) to (6).

The spherical aberration of the camera lens LA of Embodiment 2 is as shown in FIG. 7, the magnification chromatic aberration of magnification thereof is as shown in FIG. 8, and the field curvature and the distortion are as shown in FIG. 9. As shown in Table 6, the camera lens LA of Embodiment 2 has a narrow angle. As can be seen from FIGS. 7 to 9, the camera lens LA of Embodiment 2 has good optical properties.

Embodiment 3

FIG. 10 is a structural diagram of the camera lens LA of Embodiment 3. Each of the first lens L1 to the fifth lens L5 constituting the camera lens LA of Embodiment 1 has a curvature radius R of the object side and image side, a center thickness of the lens or a distance d between the lenses, a refractive index nd and an Abbe number vd as shown in Table 7, a conic coefficient k and an aspheric coefficient as shown in Table 8, and 2ω, Fno, f, f1, f2, f3, f4, f5, TTL and IH as shown in Table 9.

TABLE 7

Effective

Radius

R (mm)
d (mm)
nd
νd
(mm)

R1
5.9599
d1
4.553
nd1
1.5439
ν1
55.95
3.478

R2
−48.6640
d2
1.535

2.654

R3
−3.5330
d3
0.276
nd2
1.6606
ν2
20.40
2.100

R4
−18.8333
d4
0.137

2.055

STOP
∞

0.135

2.017

R5
18.5184
d5
1.198
nd3
1.6606
ν3
20.40
2.057

R6
−55.0356
d6
0.493

2.003

R7
−4.5524
d7
1.076
nd4
1.6150
ν4
25.92
1.984

R8
−4.2366
d8
0.081

2.056

R9
5.7382
d9
2.068
nd5
1.5439
ν5
55.95
2.129

R10
5.8046
d10
0.500

2.115

R11
∞
d11
6.000
nd6
1.7725
ν6
49.60
2.133

R12
∞
d12
1.841

2.406

R13
∞
d13
0.210
nd7
1.5168
ν7
64.17
2.555

R14
∞
d14
1.050

2.566

TABLE 8

Conic

coefficient
Aspheric coefficient

k
A4
A6
A8
A10
A12
A14

R1
0.0000E+00
−2.3007E−05
7.0614E−06
−4.7619E−07
0.0000E+00
0.0000E+00
0.0000E+00

R2
0.0000E+00
−6.4283E−05
5.6494E−05
−8.2921E−06
0.0000E+00
0.0000E+00
0.0000E+00

R3
−1.0862E+01
7.1680E−03
−8.9927E−03
3.1817E−03
−5.0425E−04
2.8910E−05
0.0000E+00

R4
0.0000E+00
4.4715E−02
−2.1906E−02
4.3028E−03
−8.1889E−05
−6.1647E−05
3.8884E−06

R5
0.0000E+00
1.2997E−02
−2.6397E−03
−3.1795E−03
1.4390E−03
−1.8965E−04
6.2731E−06

R6
0.0000E+00
−5.0769E−03
7.5690E−03
−7.3717E−03
2.7639E−03
−4.6618E−04
3.1374E−05

R7
0.0000E+00
2.8080E−03
6.9540E−03
−8.1730E−03
3.7420E−03
−8.0178E−04
6.6348E−05

R8
−1.7135E+00
1.6467E−02
−1.1647E−02
5.1830E−03
−1.1326E−03
9.9078E−05
−1.3234E−06

R9
5.1028E+00
4.7754E−03
−1.5056E−02
8.0189E−03
−2.3495E−03
3.4630E−04
−2.1030E−05

R10
5.3531E+00
−1.1425E−02
−5.7153E−04
6.7000E−04
−3.2326E−04
6.4624E−05
−5.6272E−06

TABLE 9

2ω (°)
18.00

Fno
2.50

f (mm)
16.533

f1 (mm)
10.057

f2 (mm)
−6.631

f3 (mm)
21.114

f4 (mm)
43.223

f5 (mm)
77.039

TTL (mm)
21.152

LB (mm)
9.601

IH (mm)
2.619

As shown in Table 16, Embodiment 3 satisfies the relational expressions (1) to (6).

The spherical aberration of the camera lens LA of Embodiment 3 is as shown in FIG. 11, the magnification chromatic aberration of magnification thereof is as shown in FIG. 12, and the field curvature and the distortion are as shown in FIG. 13. As shown in Table 9, the camera lens LA of Embodiment 3 has a narrow angle. As can be seen from FIGS. 11 to 13, the camera lens LA of Embodiment 3 has good optical properties.

Embodiment 4

FIG. 14 is a structural diagram of the camera lens LA of Embodiment 4. Each of the first lens L1 to the fifth lens L5 constituting the camera lens LA of Embodiment 4 has a curvature radius R of the object side and image side, a center thickness of the lens or a distance d between the lenses, a refractive index nd and an Abbe number vd as shown in Table 10, a conic coefficient k and an aspheric coefficient as shown in Table 11, and 2ω, Fno, f, f1, f2, f3, f4, f5, TTL and IH as shown in Table 12.

TABLE 10

Effective

Radius

R (mm)
d (mm)
nd
νd
(mm)

R1
5.9634
d1
4.600
nd1
1.5439
ν1
55.95
3.492

R2
−35.2721
d2
1.487

2.664

R3
−3.0679
d3
0.557
nd2
1.6606
ν2
20.40
2.145

R4
−27.8900
d4
0.179

2.052

STOP
∞

0.351

2.015

R5
9.1298
d5
0.755
nd3
1.6606
ν3
20.40
2.065

R6
−44.2634
d6
0.549

2.012

R7
−4.3992
d7
0.399
nd4
1.6150
ν4
25.92
1.981

R8
−4.2435
d8
0.050

1.991

R9
5.6357
d9
1.929
nd5
1.5439
ν5
55.95
2.031

R10
5.8279
d10
0.500

2.005

R11
∞
d11
6.000
nd6
1.7725
ν6
49.60
2.026

R12
∞
d12
1.964

2.348

R13
∞
d13
0.210
nd7
1.5168
ν7
64.17
2.536

R14
∞
d14
1.050

2.549

TABLE 11

Conic

coefficient
Aspheric coefficient

k
A4
A6
A8
A10
A12
A14

R1
0.0000E+00
−3.9317E−05
3.1747E−06
−4.2960E−07
0.0000E+00
0.0000E+00
0.0000E+00

R2
0.0000E+00
9.2222E−04
−1.1761E−04
3.1744E−06
0.0000E+00
0.0000E+00
0.0000E+00

R3
−1.0859E+01
2.3729E−03
−3.8598E−03
1.0791E−03
−1.2446E−04
4.7457E−05
0.0000E+00

R4
0.0000E+00
4.6614E−02
−2.4695E−02
7.1474E−03
−1.3064E−03
1.5999E−04
−1.0112E−05

R5
0.0000E+00
1.3555E−02
−5.0604E−03
−1.2912E−03
6.2364E−04
−3.4468E−05
−3.2320E−06

R6
0.0000E+00
−2.7598E−03
8.2922E−03
−8.6939E−03
3.1651E−03
−5.0630E−04
3.2676E−05

R7
0.0000E+00
−9.8487E−04
1.3209E−02
−1.2364E−02
5.2167E−03
−1.0819E−03
8.7987E−05

R8
−1.9155E+00
1.6941E−02
−1.1170E−02
5.0192E−03
−1.0912E−03
7.1087E−05
3.5048E−06

R9
5.3947E+00
5.8242E−03
−1.8439E−02
1.1069E−02
−3.6454E−03
6.1469E−04
−4.2859E−05

R10
5.8437E+00
−8.8864E−03
−1.8093E−03
1.4711E−03
−6.4484E−04
1.3410E−04
−1.2036E−05

TABLE 12

2ω (°)
17.99

Fno
2.50

f (mm)
16.478

f1 (mm)
9.762

f2 (mm)
−5.266

f3 (mm)
11.523

f4 (mm)
98.677

f5 (mm)
69.275

TTL (mm)
20.580

LB (mm)
9.724

IH (mm)
2.619

As shown in Table 16, Embodiment 4 satisfies the relational expressions (1) to (6).

The spherical aberration of the camera lens LA of Embodiment 4 is as shown in FIG. 15, the magnification chromatic aberration of magnification thereof is as shown in FIG. 16, and the field curvature and the distortion are as shown in FIG. 17. As shown in Table 12, the camera lens LA of Embodiment 4 has a narrow angle. As can be seen from FIGS. 15 to 17 the camera lens LA of Embodiment 4 has good optical properties.

Embodiment 5

FIG. 18 is a structural diagram of the camera lens LA of Embodiment 5. Each of the first lens L1 to the fifth lens L5 constituting the camera lens LA of Embodiment 5 has a curvature radius R of the object side and image side, a center thickness of the lens or a distance d between the lenses, a refractive index nd and an Abbe number vd as shown in Table 13, a conic coefficient k and an aspheric coefficient as shown in Table 14, and 2ω, Fno, f, f1, f2, f3, f4, f5, TTL and IH as shown in Table 15.

TABLE 13

Effective

Radius

R (mm)
d (mm)
nd
νd
(mm)

R1
6.1007
d1
4.195
nd1
1.5439
ν1
55.95
3.400

R2
−33.8926
d2
1.398

3.410

R3
−3.6264
d3
0.449
nd2
1.6606
ν2
20.40
2.928

R4
−22.9725
d4
0.167

2.371

STOP
∞

0.328

2.169

R5
26.8288
d5
0.803
nd3
1.6606
ν3
20.40
2.170

R6
−205.5056
d6
0.080

2.140

R7
−15.0717
d7
0.573
nd4
1.6150
ν4
25.92
2.151

R8
−9.2912
d8
0.050

2.101

R9
4.8621
d9
2.177
nd5
1.5439
ν5
55.95
2.039

R10
5.3424
d10
0.500

2.034

R11
∞
d11
6.000
nd6
1.7725
ν6
49.60
2.053

R12
∞
d12
2.345

2.345

R13
∞
d13
0.210
nd7
1.5168
ν7
64.17
2.548

R14
∞
d14
1.050

2.560

TABLE 14

Conic

coefficient
Aspheric coefficient

k
A4
A6
A8
A10
A12
A14

R1
0.0000E+00
2.1257E−05
1.5340E−07
6.5263E−08
0.0000E+00
0.0000E+00
0.0000E+00

R2
0.0000E+00
2.0735E−03
−5.2894E−05
−1.6288E−06
0.0000E+00
0.0000E+00
0.0000E+00

R3
−1.6926E+01
5.9618E−03
−3.2002E−03
8.0629E−04
−1.1644E−04
6.8799E−06
0.0000E+00

R4
0.0000E+00
5.5380E−02
−2.7003E−02
7.2189E−03
−1.2148E−03
1.1496E−04
−4.4200E−06

R5
0.0000E+00
3.0028E−02
−6.6986E−03
−5.2680E−03
2.3254E−03
−3.3998E−04
1.7868E−05

R6
0.0000E+00
−9.4896E−02
9.0683E−02
−4.4054E−02
1.1527E−02
−1.5305E−03
8.2136E−05

R7
0.0000E+00
−1.3929E−01
1.3906E−01
−6.1912E−02
1.5302E−02
−2.0008E−03
1.0726E−04

R8
−1.8021E+01
−2.1278E−02
4.0450E−02
−2.1600E−02
5.7000E−03
−7.7619E−04
4.3111E−05

R9
2.3095E+00
−7.6939E−03
4.3371E−03
−6.0627E−03
2.2438E−03
−3.7462E−04
2.4178E−05

R10
3.7177E+00
−9.6949E−03
−1.2892E−03
4.6252E−04
−1.1278E−04
1.3143E−05
−8.9383E−07

TABLE 15

2ω (°)
18.00

Fno
2.50

f (mm)
16.432

f1 (mm)
9.870

f2 (mm)
−6.580

f3 (mm)
35.739

f4 (mm)
37.959

f5 (mm)
38.295

TTL (mm)
20.326

LB (mm)
10.105

IH (mm)
2.619

As shown in Table 16, Embodiment 5 satisfies the relational expressions (1) to (6).

The spherical aberration of the camera lens LA of Embodiment 1 is as shown in FIG. 19, the magnification chromatic aberration of magnification thereof is as shown in FIG. 20, and the field curvature and the distortion are as shown in FIG. 21. As shown in Table 15, the camera lens LA of Embodiment 5 has a narrow angle. As can be seen from FIGS. 19 to 21, the camera lens LA of Embodiment 5 has good optical properties.

Table 16 shows the numerical values defined in Embodiments 1 to 5 and the numerical values corresponding to the parameters specified by the relational expressions (1) to (6).

TABLE 16

Embodiment 1
Embodiment 2
Embodiment 3
Embodiment 4
Embodiment 5

(f1 + f3 + f4 + f5)/f
8.498
11.525
9.159
11.484
7.416
Exp(1)

f2/f
−0.400
−0.400
−0.401
−0.320
−0.400
Exp(2)

f1/f2
−1.500
−1.530
−1.517
−1.854
−1.500
Exp(3)

R1/R2
−0.180
−0.103
−0.122
−0.169
−0.180
Exp(4)

R3/R4
0.186
0.183
0.188
0.110
0.158
Exp(5)

R5/R6
−0.130
−0.340
−0.336
−0.206
−0.130
Exp(6)

LIST OF REFERENCE NUMBERS

LA: camera lens

STOP: open aperture

L1: the first lens

L2: the second lens

L3: the third lens

L4: the fourth lens

L5: the fifth lens

GF1: glass plate 1

GF2: glass plate 2

R: the curvature radius of the optical surface, which is the center curvature radius of the lens

R1: the curvature radius of the object side surface of the first lens L1

R2: a curvature radius of the image side surface of the first lens L1

R3: a curvature radius of the object side surface of the second lens L2

R4: a curvature radius of the image side surface of the second lens L2

R5: a curvature radius of the object side surface of the third lens L3

R6: a curvature radius of the image side surface of the third lens L3

R7: a curvature radius of the object side surface of the fourth lens L4

R8: a curvature radius of the image side surface of the fourth lens L4

R9: a curvature radius of the object side surface of the fifth lens L5

R10: a curvature radius of the image side surface of the fifth lens L5

R11: a curvature radius of the object side surface of the glass plate GF1

R12: a curvature radius of the image side surface of the glass plate GF1

R13: a curvature radius of the object side surface of the glass plate GF2

R14: a curvature radius of the image side surface of the glass plate GF2

d: the center thickness of the lens or the distance between the lenses

d1: the center thickness of the first lens L1

d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2

d3: the center thickness of the second lens L2

d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3

d5: the center thickness of the third lens L3

d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4

d7: the center thickness of the fourth lens L4

d8: the axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5

d9: the center thickness of the fifth lens L5

d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the glass plate GF1;

d11: the center thickness of the glass plate GF1;

d12: the axial distance from the image side surface of the glass plate GF1 to the object side surface of the glass plate GF12;

d13: the center thickness of the glass plate GF12;

d14: the axial distance from the image side surface of the glass plate GF2 to the imaging plane;

nd: the refractive index of line d;

nd1: the refractive index of lined of the first lens L1;

nd2: the refractive index of line d of the second lens L2;

nd3: the refractive index of line d of the third lens L3;

nd4: the refractive index of line d of the fourth lens L4;

nd5: the refractive index of line d of the fifth lens L5;

nd6: the refractive index of line d of the glass plate GF1;

nd7: the refractive index of line d of the glass plate GF2;

ν: the Abbe number;

ν1: the Abbe number of the first lens L1;

ν2: the Abbe number of the second lens L2;

ν3: the Abbe number of the third lens L3;

ν4: the Abbe number of the fourth lens L4;

ν5: the Abbe number of the fifth lens L5;

ν6: the Abbe number of the glass plate GF1;

ν7: the Abbe number of the glass plate GF2.

Camera lens

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

CPC

Field of Search

CPC

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Abstract

Description

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Foreign Referenced Citations (1)

Non-Patent Literature Citations (1)

Related Publications (1)