Wide Angle Lens

FIELD OF THE PRESENT INVENTION

The present invention relates to a camera lens, in particular to a mobile phone camera assembly, a WEB camera lens, and so on, which are suitable for use with camera components such as a high-pixel CCD or CMOS. Meanwhile, the wide angle lens is consist of six lenses, which has excellent optical characteristics, TTL (optical total length)/IH (image height) custom-character 1.50, is ultra-thin and a F number (hereinafter referred as FNO) is less than 2.00.

DESCRIPTION OF RELATED ART

In recent years, various types of camera apparatuses using camera components such as CCD and CMOS have been widely used. With the development of miniaturization and high performance of these camera components, the society has demands on cameras lens with excellent optical characteristics, ultra-thin, and with bright FNO.

The development of technology related to a camera lens composed of six lenses which has excellent optical characteristics, ultra-thin, and bright FNO is progressing step by step. The proposed solution is that the wide angle lens is consist of six lenses, from an object side to an image side in sequence: a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a positive refractive power, a fourth lens with a negative refractive power, a fifth lens with a positive refractive power, and a sixth lens with a negative refractive power.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a structure of a wide angle lens in accordance with Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of a longitudinal aberration of the wide angle lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the wide angle lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the wide angle lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a wide angle lens in accordance with Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of a longitudinal aberration of the wide angle lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the wide angle lens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion of the wide angle lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a wide angle lens in accordance with Embodiment 3 of the present invention;

FIG. 10 is a schematic diagram of a longitudinal aberration of the wide angle lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the wide angle lens shown in FIG. 9;

FIG. 12 is a schematic diagram of a field curvature and a distortion of the wide angle lens shown in FIG. 9;

FIG. 13 is a schematic diagram of a structure of a wide angle lens in accordance with Embodiment 4 of the present invention;

FIG. 14 shows a schematic diagram of a longitudinal aberration of the wide angle lens shown in FIG. 13;

FIG. 15 shows a schematic diagram of a lateral color of the wide angle lens shown in FIG. 13; and

FIG. 16 shows a schematic diagram of a field curvature and a distortion of the wide angle lens shown in FIG. 13.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

In order to make the objects, technical solutions, and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail below, combined with the drawings. However, it will be apparent to the one skilled in the art that, in the various embodiments of the present invention, a number of technical details are presented in order to provide the reader with a better understanding of the invention. However, the technical solutions claimed in the present invention can be implemented without these technical details and can be implemented based on various changes and modifications to the following embodiments.

Embodiment 1

As referring to accompany figures, the present invention provides a wide angle lens 10. FIG. 1 shows the wide angle lens 10 according to embodiment 1 of the present invention, and the wide angle lens 10 comprises six lenses. Specifically, from an object side to an image side, the wide angle lens 10 comprises in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. Optical elements like optical filter GF can be arranged between the sixth lens L6 and an image surface Si.

The first lens L1 is made of plastic material, the second lens L2 is made of plastic material, the third lens L3 is made of plastic material, the fourth lens L4 is made of plastic material, the fifth lens L5 is made of plastic material, and the sixth lens L6 is made of plastic material.

The first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the five lens L5 has a positive refractive power, and the sixth lens L6 has a negative refractive power.

Here, a focal length of the wide angle lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The wide angle lens 10 satisfies the following condition: 0.80 custom-character f1/f1.50, which specifies a ratio of the focal length f1 of the first lens L1 to the focal length f of the wide angle lens 10. The miniaturization of the wide angle lens is achieved by controlling a positive refractive power of the first lens L1 within a reasonable range.

A focal length of the second lens L2 is defined as f2, and a focal length of the third lens L3 is defined as f3. The wide angle lens 10 satisfies the following condition: 0.05 custom-character f2/f30.20, which specifies a ratio of the focal length f2 of the second lens L2 to the focal length f3 of the third lens L3. The refractive power is reasonably distributed so that the wide angle lens has a good imaging quality and lower sensitivity.

An on-axis thickness of the first lens L1 is defined as d1, and an on-axis thickness of the fifth lens L5 is defined as d9. The wide angle lens 10 satisfies 1.15 custom-character d1/d91.40, which specifies a ratio of the on-axis thickness of the first lens L1 to the on-axis thickness of the the fifth lens L5. When the value is out of the range, as the wide angle lens develops toward ultra-thin and wide-angle, it is difficult to correct an aberration.

A minimum interval distance between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 along a direction parallel to the optical axis is defined as T56min. In the present embodiment, T56min is 0.463 mm, which is located at a height of 1.7 mm from the optical axis. An on-axis thickness of the sixth lens L6 is d11, and the wide angle lens 10 satisfies the following condition: T56min/d11 custom-character 0.50, when the value is within the range, it is beneficial for correcting the aberration of the system and improving image quality.

A total optical length from an object side surface of the first lens of the wide angle lens to the image surface of the wide angle lens along an optical axis is defined as TTL. When the focal length of the first lens, the whole focal length of the wide angle lens, the on-axis thickness of the first lens, the on-axis thickness of the fifth lens, the minimum interval distance between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 along a direction parallel to the optical axis, and the on-axis thickness of the sixth lens of the present invention satisfy the above conditions, the wide angle lens 10 can have a high performance and satisfy the design requirement on wide angle and low TTL. Specifically, a focal length of the wide angle lens 10 is 4.261 mm, a total optical length from an object side surface of the first lens of the wide angle lens to an image surface of the wide angle lens along an optical axis TTL is 4.908 mm, a back focal length LB is 0.900 mm, an vision field angle is 77.55°, and an FNO is 1.801.

In the embodiment, the object side surface of the first lens L1 is convex in a paraxial region, an image side surface of the first lens L1 is concave in the paraxial region, and the first lens L1 has a positive refractive power, and the focal length f1 of the first lens is 3.789 mm.

An on-axis curvature radius of the object side surface of the first lens L1 is defined as R1, an on-axis curvature radius of the image side surface of the first lens L1 is defined as R2. The wide angle lens 10 satisfies the following condition: −5.00 custom-character (R1+R2)/(R1−R2)−1.00, which specifies a shape of the first lens L1. The first lens can effectively correct a spherical aberration of the system by reasonably controlling the shape of the first lens, and when the value is within the range, it is beneficial for achieving a wide angle and miniaturization under the condition of FNO lighting. Preferably, the following condition shall be satisfied, −2.50 custom-character (R1+R2)/(R1−R2)−1.20.

An object side surface of the second lens L2 is convex in the paraxial region, an image side surface of the second lens L2 is concave in the paraxial region, and the second lens L2 has a negative refractive power, and the focal length f2of the second lens L2 is −10.757 mm.

The wide angle lens 10 satisfies the condition: −1.00 custom-character f1/f2−0.20, which specifies a ratio of the focal length f1 of the first lens L1 to the focal length f2 of the second lens L2. The refractive power is reasonably distributed so that the system has a good imaging quality and lower sensitivity. Preferably, the following condition shall be satisfied, −0.60 custom-character f1/f2−0.20.

An object side surface of the third lens L3 is convex in the paraxial region, an image side surface of the third lens L3 is concave in the paraxial region, and the third lens L3 has a positive refractive power, and the focal length f3 of the third lens is 52.737 mm.

An object side surface of fourth lens L4 is convex in the paraxial region, an image side surface of the fourth lens L4 is concave in the paraxial region, and the fourth lens L4 has a negative refractive power, and the focal length f4 of the fourth lens is −24.717 mm.

The wide angle lens satisfies the condition: −20.00 custom-character f4/f−2.00, and specifies a ratio of the focal length f4 of the fourth lens L4 to the focal length f of the wide angle lens 10. A miniaturization of the wide angle lens is achieved by controlling the negative refractive power of the fourth lens L4 being within a reasonable range. Preferably, the following condition shall be satisfied, −12.00 custom-character f4/f−2.00.

An object side surface of fifth lens L5 is convex in the paraxial region, an image side surface of the fifth lens L5 is convex in the paraxial region, and the fifth lens L5 has a positive refractive power, and the focal length f5 of the fifth lens is 3.148 mm.

An object side surface of sixth lens L6 is concave in the paraxial region, an image side surface of the sixth lens L6 is concave in the paraxial region, and the sixth lens L6 has a negative refractive power, and the focal length f6 of the sixth lens is −2.343 mm.

A vertical distance between an arrest point of the image side surface of the sixth lens L6 and the optical axis is 0.975 mm. The total optical length TTL of the wide angle lens 10 is 4.908 mm. The wide angle lens satisfies the condition: 0.10 custom-character Yc62/TTL0.55, which specifies a ratio of a arrest point position to the total optical length TTL. When the value is out of the range, it is difficult to correct an aberration and a distortion of the wide angle lens 10.

An FNO of the wide angle lens 10 is less than or equal to 2.00. The FNO is an F number of the wide angle lens 10, and when this condition is satisfied, the wide angle lens 10 can have a good brightness and a better night shooting effect, and satisfy the requirement on large aperture.

With such design, the total optical length TTL of the whole wide angle lens 10 can be made as short as possible, thus the miniaturization characteristics can be maintained and satisfy the demands on large aperture.

Preferably, the wide angle lens 10 satisfies the condition: T56min/d11 custom-character 1.00, and when the value is within the range, it is beneficial for correcting the aberration of the system and improving imaging quality.

In the following, examples will be used to describe the wide angle lens 10 of the present invention. The symbols recorded in each example are as follows. The unit of the focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position and arrest point position is mm, and the unit of a whole picture angle is °.

f: focal length of the wide angle lens;

f1: focal length of the first lens L1;

f2: focal length of the second lens L2;

f3: focal length of the third lens L3;

f4: focal length of the fourth lens L4;

FNO: F number;

2ω: whole picture angel;

S1: Aperture;

R: curvature radius of an optical surface, the central curvature radius in case of lens;

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

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

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

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

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

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

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

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

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

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

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of an object side surface of the optical filter GF;

R14: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of the lens and the distance on-axis between the lenses;

d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

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

d3: on-axis thickness of the second lens L2;

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

d5: on-axis thickness of the third lens L3;

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

d7: on-axis thickness of the fourth lens L4;

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

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the optical filter GF;

d13: on-axis thickness of the optical filter GF;

d14: on-axis distance from the image side surface Si to the image surface of the optical filter GF to the image surface;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

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

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

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

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

nd6: refractive index of the d line of the sixth lens L6;

ndg: refractive index of the d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

vg: abbe number of the optical filter GF;

TTL: total optical length from the object side surface of the first lens of the wide angle lens to an image surface Si of the wide angle lens along an optical axis, the unit of TTL is mm;

LB: on-axis distance from the image side of the sixth lens L6 to the axis of the image surface Si (including a thickness of the optical filter GF);

IH: Image height;

y=(x²/R)/[1+{1−(k+1)(x²R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12 x¹²+A14x¹⁴A16x¹⁶+A18¹⁸+A20x²⁰ (1).

Wherein, K is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric surface coefficient s. x is a vertical distance of the point on the aspheric curve and the optical axis, and y is a depth of the aspheric surface (the vertical distance between the point on the aspheric surface from the optical axis x and the tangent on the apex on the aspherical optical axis).

For convenience, the aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present invention is not limited to the aspherical polynomials form shown in the formula (1).

Preferably, inflexion points and/or arrest points can also be arranged on the object side surface and/or image side surface of the lens, so that the demand for high quality imaging can be satisfied, the description below can be referred for specific implementable scheme.

The design information of the wide angle lens 10 in Embodiment 1 of the present invention is shown in the tables 1 and 2.

TABLE 1

R
d
nd
νd

S1
∞
d0=
−0.520

R1
1.594
d1=
0.736
nd1
1.5439
ν1
55.95

R2
5.827
d2=
0.101

R3
8.447
d3=
0.219
nd2
1.6713
ν2
19.24

R4
3.872
d4=
0.310

R5
10.357
d5=
0.401
nd3
1.5439
ν3
55.95

R6
15.959
d6=
0.182

R7
48.142
d7=
0.288
nd4
1.6713
ν4
19.24

R8
12.395
d8=
0.305

R9
25.644
d9=
0.570
nd5
1.5439
ν5
55.95

R10
−1.826
d10=
0.527

R11
−3.034
d11=
0.368
nd6
1.5352
ν6
56.12

R12
2.240
d12=
0.300

R13
∞
d13=
0.110
ndg
1.5168
νg
64.17

R14
∞
d14=
0.490

Table 2 shows the aspherical surface data of the wide angle lens 10 in the Embodiment 1 of the present invention.

TABLE 2

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10
A12
A14
A16

R1
−1.4230E−03
3.8410E−03
−1.0465E−02
1.5938E−02
2.0409E−02
−7.3628E−02
6.8456E−02
−2.1240E−02

R2
−4.4367E−01
−1.0986E−01
1.3785E−01
−1.1615E−01
6.4739E−02
−2.7724E−02
7.4845E−03
−1.6282E−03

R3
−5.7909E−01
−2.1365E−01
3.4388E−01
−1.4238E−01
−4.6060E−01
1.3201E+00
−1.8001E+00
1.4122E+00

R4
1.1124E−01
−1.4067E−01
2.5965E−01
−1.0587E−01
−5.9925E−02
7.9733E−02
−1.3742E−02
8.3297E−03

R5
9.4576E−01
−9.6787E−02
−3.2332E−01
1.9186E+00
−6.3961E+00
1.2989E+01
−1.6744E+01
1.3322E+01

R6
5.9903E+00
−1.7748E−01
−2.8905E−04
4.5813E−01
−1.4589E+00
2.1868E+00
−2.0206E+00
1.2070E+00

R7
−2.4742E+02
−3.1796E−01
1.7328E−01
4.9938E−02
−2.2366E−01
2.3113E−01
−3.2521E−01
3.5184E−01

R8
2.5261E+00
−2.7682E−01
7.9375E−02
1.5396E−01
−2.4582E−01
1.6481E−01
−6.7596E−02
2.1476E−02

R9
4.8104E+00
−5.0446E−02
−1.1556E−01
3.4127E−02
9.8794E−02
−1.2638E−01
7.1652E−02
−2.4513E−02

R10
−2.9832E+00
4.4122E−02
−1.1838E−01
6.5669E−02
−1.7137E−02
9.8329E−03
−5.9724E−03
1.7125E−03

R11
−3.0068E+00
−1.7462E−01
7.7134E−02
−9.1244E−03
−8.8196E−04
2.0451E−04
3.0225E−05
−1.0756E−05

R12
−1.6217E+01
−1.1920E−01
6.5648E−02
−2.5435E−02
6.5230E−03
−1.0913E−03
1.1214E−04
−6.4193E−06

FIG. 2 and FIG. 3 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the wide angle lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the wide angle lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

Table 9 described below shows the various values of the Embodiments 1, 2, 3 and the values corresponding to the parameters which are specified in the conditions.

As shown in Table 9, Embodiment 1 satisfies the above conditions.

In this embodiment, an entrance pupil diameter ENPD of the wide angle lens is 2.366 mm. An image height of 1.0H is 3.465 mm. An FOV 2ω is 77.55°. Thus, the wide angle lens has a wide-angle and is ultra-thin. It's on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1, the meaning of its symbols is the same as that of Embodiment 1, in the following, only the differences are listed.

Table 3 and table 4 show the design data of a wide angle lens 20 in Embodiment 2 of the present invention.

TABLE 3

R
d
nd
νd

S1
∞
d0=
−0.400

R1
1.797
d1=
0.614
nd1
1.5439
ν1
55.95

R2
11.225
d2=
0.129

R3
4.325
d3=
0.220
nd2
1.6713
ν2
19.24

R4
2.572
d4=
0.332

R5
9.095
d5=
0.334
nd3
1.5439
ν3
55.95

R6
11.263
d6=
0.114

R7
−21.816
d7=
0.321
nd4
1.6713
ν4
19.24

R8
−331.005
d8=
0.317

R9
−26.683
d9=
0.440
nd5
1.5439
ν5
55.95

R10
−1.600
d10=
0.552

R11
−4.226
d11=
0.270
nd6
1.5352
ν6
56.12

R12
2.282
d12=
0.644

R13
∞
d13=
0.110
ndg
1.5168
νg
64.17

R14
∞
d14=
0.500

Table 4 shows the aspherical surface data of each lens of the wide angle lens 20 in Embodiment 2 of the present invention.

TABLE 4

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10

R1
−3.1877E−02
−7.3140E−04
−4.9685E−03
9.8774E−04
2.7979E−02

R2
4.2741E+01
−8.7465E−02
1.4201E−01
−1.2843E−01
7.0731E−02

R3
1.9060E+00
−2.2498E−01
3.1605E−01
−1.3175E−01
−4.7093E−01

R4
−7.6850E+00
−1.4886E−01
2.3591E−01
−1.8177E−01
−2.3979E−02

R5
−4.4294E+02
−3.8186E−02
−3.9200E−01
1.8949E+00
−6.3509E+00

R6
−4.1681E+00
−2.4248E−01
−4.2826E−02
4.7623E−01
−1.4525E+00

R7
0.0000E+00
−3.6181E−01
1.7592E−01
7.8506E−02
−2.2522E−01

R8
0.0000E+00
−2.6205E−01
8.4665E−02
1.5365E−01
−2.3930E−01

R9
0.0000E+00
−6.2058E−02
−1.2164E−01
4.6509E−02
8.3262E−02

R10
−2.5917E+00
4.9769E−02
−1.1364E−01
6.6803E−02
−1.6716E−02

R11
−2.9679E+00
−1.7326E−01
7.6701E−02
−9.2220E−03
−9.1651E−04

R12
−1.6526E+01
−1.3070E−01
6.5647E−02
−2.5367E−02
6.5266E−03

Aspherical surface coefficients

A12
A14
A16
A18
A20

R1
−6.9724E−02
6.8304E−02
−2.2715E−02
−3.0904E−03
2.3802E−03

R2
−2.2637E−02
8.0485E−03
−2.5460E−03
−2.3042E−04
−2.4184E−04

R3
1.3169E+00
−1.7963E+00
1.4119E+00
−5.9870E−01
1.0537E−01

R4
1.2655E−01
−2.2845E−02
−4.8155E−02
−4.0644E−02
6.2890E−02

R5
1.3004E+01
−1.6737E+01
1.3265E+01
−5.9816E+00
1.1876E+00

R6
2.1820E+00
−2.0255E+00
1.2180E+00
−4.2394E−01
5.6877E−02

R7
2.3228E−01
−3.2146E−01
3.6423E−01
−1.6174E−01
1.4562E−02

R8
1.6769E−01
−6.9874E−02
1.7488E−02
−6.0595E−03
4.1167E−03

R9
−1.3097E−01
7.2671E−02
−2.3739E−02
5.1062E−03
−7.8602E−04

R10
9.8183E−03
−6.0975E−03
1.6547E−03
−2.2549E−04
1.4151E−05

R11
2.0882E−04
3.2024E−05
−1.0776E−05
1.0251E−06
−3.6305E−08

R12
−1.0953E−03
1.1132E−04
−6.4040E−06
1.8185E−07
5.0717E−09

FIG. 6 and FIG. 7 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the wide angle lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the wide angle lens 20 according to Embodiment 2, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

As shown in Table 9, Embodiment 2 satisfies the above conditions.

In this embodiment, the focal length f1 of the first lens L1 is 3.833 mm. The focal length f2 of the second lens L2 is −9.868 mm. The focal length f3 of the third lens L3 is 82.107 mm. The focal length f4 of the fourth lens L4 is −34.485 mm. The focal length f5 of the fifth lens L5 is 3.100 mm. The focal length f6 of the sixth lens L6 is −2.720 mm, and the vertical distance Yc62 between the arrest point of the image side surface of the sixth lens L6 and the optical axis is 0.875 mm.

In this embodiment, the object side surface of the fourth lens L4 is a concave surface, the image side surface of the fourth lens L4 is a convex surface, and the object side surface of the fifth lens L5 is a concave surface. The T56min located at the optical axis is 0.552 mm.

The focal length of the wide angle lens 10 is 4.275 mm. The total optical length TTL is 4.896 mm. The back focal LB is 1.254 mm, the FNO is 1.840. The entrance pupil diameter ENPD of the wide angle lens is 2.323 mm. The image height of 1.0H is 3.465 mm. The FOV 2ω is 77.00°. Thus, the wide angle lens has a wide-angle and is ultra-thin and its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1, the meaning of its symbols is the same as that of Embodiment 1, in the following, only the differences are listed.

Table 5 and table 6 show the design data of a wide angle lens 30 in Embodiment 3 of the present invention.

TABLE 5

R
d
nd
νd

S1
∞
d0=
−0.395

R1
1.754
d1=
0.626
nd1
1.5439
ν1
55.95

R2
15.887
d2=
0.115

R3
4.682
d3=
0.220
nd2
1.6713
ν2
19.24

R4
2.495
d4=
0.294

R5
8.068
d5=
0.328
nd3
1.5439
ν3
55.95

R6
38.142
d6=
0.134

R7
−5.799
d7=
0.341
nd4
1.6713
ν4
19.24

R8
−17.114
d8=
0.310

R9
−20.082
d9=
0.482
nd5
1.5439
ν5
55.95

R10
−1.562
d10=
0.542

R11
−4.016
d11=
0.274
nd6
1.5352
ν6
56.12

R12
2.309
d12=
0.629

R13
∞
d13=
0.110
ndg
1.5168
νg
64.17

R14
∞
d14=
0.500

Table 6 shows the aspherical surface data of each lens of the wide angle lens 30 in Embodiment 3 of the present invention.

TABLE 6

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10

R1
−6.3924E−02
−1.0006E−03
−8.0091E−03
−1.6555E−04
2.6617E−02

R2
1.2625E+02
−8.1229E−02
1.3595E−01
−1.3262E−01
7.0119E−02

R3
8.0662E+00
−2.0485E−01
3.1663E−01
−1.3591E−01
−4.7228E−01

R4
−6.4584E+00
−1.3570E−01
2.4367E−01
−1.8579E−01
−2.6354E−02

R5
−3.6298E+02
−3.5332E−02
−3.9206E−01
1.8921E+00
−6.3538E+00

R6
1.1500E+03
−2.3168E−01
−4.3272E−02
4.7730E−01
−1.4484E+00

R7
0.0000E+00
−3.6175E−01
1.8230E−01
8.5349E−02
−2.2549E−01

R8
0.0000E+00
−2.5994E−01
8.4539E−02
1.5316E−01
−2.3952E−01

R9
0.0000E+00
−6.2747E−02
−1.2197E−01
4.6606E−02
8.3528E−02

R10
−2.5766E+00
4.9570E−02
−1.1368E−01
6.6785E−02
−1.6731E−02

R11
−2.8303E+00
−1.7336E−01
7.6700E−02
−9.2205E−03
−9.1625E−04

R12
−1.8066E+01
−1.3093E−01
6.5668E−02
−2.5361E−02
6.5273E−03

Aspherical surface coefficients

A12
A14
A16
A18
A20

R1
−7.0500E−02
6.7960E−02
−2.2801E−02
−3.1375E−03
2.2158E−03

R2
−2.2860E−02
7.5340E−03
−3.1107E−03
−4.2862E−04
2.3368E−04

R3
1.3192E+00
−1.7930E+00
1.4143E+00
−5.9848E−01
1.0303E−01

R4
1.2874E−01
−1.9902E−02
−4.6184E−02
−4.1452E−02
6.1956E−02

R5
1.3001E+01
−1.6738E+01
1.3264E+01
−5.9812E+00
1.1898E+00

R6
2.1827E+00
−2.0295E+00
1.2129E+00
−4.2533E−01
6.2931E−02

R7
2.2579E−01
−3.2209E−01
3.7169E−01
−1.5442E−01
8.8532E−03

R8
1.6786E−01
−6.9444E−02
1.7899E−02
−5.8542E−03
4.3639E−03

R9
−1.3077E−01
7.2807E−02
−2.3641E−02
5.1743E−03
−7.1325E−04

R10
9.8112E−03
−6.0995E−03
1.6548E−03
−2.2450E−04
1.4890E−05

R11
2.0876E−04
3.1998E−05
−1.0785E−05
1.0231E−06
−3.6595E−08

R12
−1.0953E−03
1.1131E−04
−6.4101E−06
1.7995E−07
4.6474E−09

FIG. 10 and FIG. 11 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the wide angle lens 30 according to Embodiment 3. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the wide angle lens 30 according to Embodiment 3, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

The following table 9, in accordance with the above conditions, lists the values in this embodiment corresponding to each condition. Apparently, the wide angle lens of this embodiment satisfies the above conditions.

In this embodiment, the focal length f1 of the first lens L1 is 3.559 mm. The focal length f2 of the second lens L2 is −8.216 mm. The focal length f3 of the third lens L3 is 18.679 mm. The focal length f4 of the fourth lens L4 is −13.104 mm. The focal length f5 of the fifth lens L5 is 3.076 mm. The focal length f6 of the sixth lens L6 is −2.690 mm, and the vertical distance between the arrest point of the image side surface of the sixth lens L6 and the optical axis is 0.855 mm.

In this embodiment, the focal length of the wide angle lens 10 is 4.295 mm. The total optical length TTL is 4.904 mm. The back focal length LB is 1.239 mm. The FNO is 1.840. The entrance pupil diameter ENPD of the wide angle lens is 2.334 mm. The image height of 1.0H is 3.465 mm, The FOV 2ω is 76.68°. Thus, the wide angle lens has a wide-angle and is ultra-thin. It's on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 4

Embodiment 4 is basically the same as Embodiment 1, the meaning of its symbols are the same as that of Embodiment 1, in the following, only the differences are listed.

Table 7 and table 8 show the design data of a wide angle lens 40 lens in Embodiment 4 of the present invention.

TABLE 7

R
d
nd
νd

S1
∞
d0=
0.000

R1
1.674
d1=
0.621
nd1
1.5439
ν1
55.95

R2
4.025
d2=
0.114

R3
3.303
d3=
0.220
nd2
1.6713
ν2
19.24

R4
2.631
d4=
0.262

R5
14.921
d5=
0.339
nd3
1.5439
ν3
55.95

R6
15.997
d6=
0.058

R7
−88.717
d7=
0.245
nd4
1.6713
ν4
19.24

R8
41.819
d8=
0.333

R9
−4128.897
d9=
0.531
nd5
1.5439
ν5
55.95

R10
−1.511
d10=
0.524

R11
−4.117
d11=
0.294
nd6
1.5352
ν6
56.12

R12
2.214
d12=
0.678

R13
∞
d13=
0.110
ndg
1.5168
νg
64.17

R14
∞
d14=
0.500

Table 8 shows the aspherical surface data of each lens of the wide angle lens 40 in Embodiment 4 of the present invention.

TABLE 8

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10

R1
2.1487E−01
−8.6894E−06
1.3297E−03
−5.0926E−03
3.2695E−02

R2
−7.5946E+00
−8.6826E−02
1.4909E−01
−1.5079E−01
5.2798E−02

R3
2.2267E+00
−2.3029E−01
2.6215E−01
−1.7028E−01
−4.6799E−01

R4
−5.0250E+00
−1.3509E−01
2.0541E−01
−1.9384E−01
−2.4808E−02

R5
−1.6830E+03
−3.7046E−02
−3.7938E−01
1.9012E+00
−6.3585E+00

R6
1.1267E+02
−2.2785E−01
−5.0450E−02
4.7891E−01
−1.4506E+00

R7
−6.6974E+02
−3.6131E−01
1.7609E−01
7.9447E−02
−2.2517E−01

R8
0.0000E+00
−2.6178E−01
8.5136E−02
1.5468E−01
−2.3900E−01

R9
0.0000E+00
−3.7251E−02
−1.2084E−01
4.8609E−02
8.5149E−02

R10
−2.3693E+00
5.2713E−02
−1.0994E−01
6.6950E−02
−1.6789E−02

R11
−1.9065E+00
−1.7386E−01
7.6933E−02
−9.1658E−03
−9.1060E−04

R12
−1.6827E+01
−1.2657E−01
6.5661E−02
−2.5349E−02
6.5348E−03

Aspherical surface coefficients

A12
A14
A16
A18
A20

R1
−6.2117E−02
6.9335E−02
−2.9092E−02
−9.5101E−03
1.1145E−02

R2
−1.4331E−02
3.9517E−02
−6.4888E−03
−1.6275E−02
1.6320E−02

R3
1.3446E+00
−1.7920E+00
1.4047E+00
−6.0342E−01
1.0960E−01

R4
1.1364E−01
−2.8118E−02
−4.6578E−02
−4.1172E−02
6.5389E−02

R5
1.2987E+01
−1.6763E+01
1.3243E+01
−5.9868E+00
1.2316E+00

R6
2.1795E+00
−2.0288E+00
1.2163E+00
−4.2299E−01
5.4892E−02

R7
2.3276E−01
−3.2151E−01
3.5860E−01
−1.6668E−01
1.1939E−02

R8
1.6719E−01
−7.0619E−02
1.7084E−02
−6.1669E−03
4.3827E−03

R9
−1.3019E−01
7.3144E−02
−2.3304E−02
5.4186E−03
−6.1910E−04

R10
9.8031E−03
−6.0935E−03
1.6591E−03
−2.2242E−04
1.5544E−05

R11
2.0921E−04
3.1966E−05
−1.0803E−05
1.0173E−06
−3.8362E−08

R12
−1.0941E−03
1.1136E−04
−6.4255E−06
1.7369E−07
3.0508E−09

FIG. 14 and FIG. 15 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the wide angle lens 40 according to Embodiment 4. FIG. 16 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the wide angle lens 40 according to Embodiment 4, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

The following table 9, in accordance with the above conditions, lists the values in this embodiment corresponding to each condition. Apparently, the camera optical lens of this embodiment satisfies the above conditions.

In this embodiment, the focal length f1 of the first lens L1 is 4.803 mm. The focal length f2 of the second lens L2 is −22.014 mm. The focal length f3 of the third lens L3 is 365.803 mm. The focal length f4 of the fourth lens L4 is −41.917 mm. The focal length f5 of the fifth lens is 2.769 mm. The focal length f6 of the sixth lens L6 is −2.639 mm, and the vertical distance Yc62 between the arrest point of the image side of the sixth lens L6 and the optical axis is 0.905 mm.

In this embodiment, the object side surface of the fourth lens L4 is a concave surface and the image side surface of the fourth lens L4 is a concave surface. The object side surface of the fifth lens L5 is a concave surface, the T56min located at a height of 1.6 mm from the optical axis is 0.504 mm.

In this embodiment, the whole focal length of the wide angle lens 10 is 4.104 mm. The total optical length TTL is 4.829 mm. The back focal length LB is 1.288 mm. The FNO is 1.885. The entrance pupil diameter ENPD of the wide angle lens is 2.177 mm. The image height of 1.0H is 3.465 mm. The FOV 2ω is 79.44°. Thus, the wide angle lens has a wide-angle and is ultra-thin and its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Table 9 shows the various values of the Embodiments 1, 2, 3 and 4 the values corresponding to the parameters which are specified in the conditions.

TABLE 9

Embodi-
Embodi-
Embodi-
Embodi-

Conditions
ment 1
ment 2
ment 3
ment 4

f1/f
0.89
0.90
0.83
1.17

f2/f3
−0.20
−0.12
−0.44
−0.06

d1/d9
1.29
1.40
1.30
1.17

T56 min/d11
1.26
2.04
1.98
1.71

It is to be understood, however, that even though numerous characteristics and advantages of the present exemplary embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the invention is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms where the appended claims are expressed.

Wide Angle Lens

Information

Publication Number

Date Filed

Date Published

Inventors

Original Assignees

CPC

International Classifications

Abstract

Description

Claims

Priority Claims (1)