Zoom lens

TECHNICAL FIELD

The present invention relates to a zoom lens having a contraction structure, and in particular relates to a zoom lens suitable for camera components for smartphones, digital cameras, etc., which adopt camera elements such as CCDs and CMOS for high pixels. The zoom lens becomes bright and has good optical properties as well as a zoom ratio above 1.80, when the F number (hereinafter referred to as FNO) at a wide-angle end is below 2.0. The zoom lens becomes compact as the TTL (total optical length of the zoom lens) in a contracted state is less than 8.00 mm. The zoom lens consists of six lenses divided into four groups.

BACKGROUND

In recent years, there has been a demand for a zoom lens in following configurations that the zoom lens has a FNO≤2.0 at a wide-angle end, a zoom ratio ≥1.80, having good optical properties, and TTL would decrease when the lens barrel gets contracted into the camera during non-imaging state, and the zoom lens becomes compact when contracted.

A technical development of a zoom lens consisting of six lenses is being advanced. In a related art, as a six-piece structured zoom lens, a lens consisting of six lenses in three groups is proposed.

The camera lens disclosed in the embodiment of the related art has a zoom ratio above 4.74, but when the FNO at the wide-angle end is above 2.552, the brightness is insufficient, and the TTL during imaging is also long and the miniaturization is not sufficient.

SUMMARY

One objective of the present invention to provide such a zoom lens that the zoom lens becomes compact when contracted as TTL≤8.00 mm, and the zoom lens becomes bright when FNO≤2.0 at a wide-angle end during imaging, and the zoom lens has good optical properties and a zoom ratio ≥1.80, and consists of six lenses in four groups.

In order to achieve the above objective, the inventor of the present invention carefully studied a ratio of a focal length of a third lens to a focal length of a second lens, and a ratio of a focal length of a fourth lens to the focal length of the second lens, and found that it was possible to obtain a zoom lens that could improve the subject matter of the related art, and the present invention is thus acquired.

According to one embodiment of the present invention, a zoom lens is provided. The zoom lens consists of, from an object side to an image side in sequence: a first lens having negative refractive power, a second lens group having positive refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power. Among the first lens, the second lens group, the fifth lens, and the sixth lens, a distance between adjacent lenses or between lens and adjacent lens group in a direction of an optic axis varies during zooming. The second lens group consists of a second lens having positive refractive power, a third lens having negative refractive power, and a fourth lens having negative refractive power. The zoom lens satisfies the following conditions: f_Tele/f_Wide≥1.80; −1.75≤f3/f2≤−1.35; and −1.75≤f4/f2≤−1.35; wherein, f_Wide denotes a total optical length of the zoom lens at a wide-angle (Wide) end, f_Tele denotes a total optical length of the zoom lens at a telephoto (Tele) end, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens.

As an improvement, the zoom lens further satisfies a following condition: −1.30≤f1/fG2≤−1.00; wherein, f1 denotes a focal length of the first lens, and fG2 denotes a combined focal length of the second lens group.

As an improvement, the zoom lens further satisfies a following condition: 0.30≤f5/fG2≤0.40; wherein, f5 denotes a focal length of the fifth lens, and fG2 denotes the combined focal length of the second lens group.

As an improvement, the zoom lens further satisfies a following condition: −1.50≤f6/fG2≤−1.00; wherein, f6 denotes a focal length of the sixth lens, and fG2 denotes the combined focal length of the second lens group.

As an improvement, the zoom lens further satisfies a following condition: 4.00≤LB_Tele/LB_Wide≤5.00, wherein, LB_Wide denotes an on-axis distance from an image side surface of the sixth lens to an image surface, at the wide-angle end; and LB_Tele denotes the on-axis distance from the image side surface of the sixth lens to the image surface, at the telephoto end.

As an improvement, the zoom lens further satisfies a following condition: 76.00≤v1≤82.00, wherein, v1 denotes an Abbe number of the first lens.

As an improvement, the first lens is a glass lens.

Beneficial effects of the present invention are as follows.

According to the present invention, the present invention is particularly an invention relating to a zoom lens as follows. The zoom lens is suitable for camera components for smartphones, digital cameras, etc., which adopt camera elements such as CCDs and CMOS for high pixels. The zoom lens becomes compact when the TTL in a contracted state is less than 8.00 mm, while during imaging, the zoom lens becomes bright when the FNO at a wide-angle end is below 2.0. The zoom lens has good optical properties as well as a zoom ratio above 1.80, and consists of six lenses in four groups.

BRIEF DESCRIPTION OF DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly describe the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For a person of ordinary skill in the art, other drawings may be obtained from these drawings without creative work.

FIG. 1 is a schematic diagram of a general structure of a zoom lens LA according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a wide-angle end according to Embodiment 1 of the present invention.

FIG. 3 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a telephoto end according to Embodiment 1 of the present invention.

FIG. 4 is a schematic diagram of a general structure of a zoom lens LA according to Embodiment 2 of the present invention.

FIG. 5 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a wide-angle end according to Embodiment 2 of the present invention.

FIG. 6 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a telephoto end according to Embodiment 2 of the present invention.

FIG. 7 is a schematic diagram of a general structure of a zoom lens LA according to Embodiment 3 of the present invention.

FIG. 8 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a wide-angle end according to Embodiment 3 of the present invention.

FIG. 9 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a telephoto end according to Embodiment 3 of the present invention.

FIG. 10 is a schematic diagram of a general structure of a zoom lens LA according to Embodiment 4 of the present invention.

FIG. 11 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a wide-angle end according to Embodiment 4 of the present invention.

FIG. 12 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a telephoto end according to Embodiment 4 of the present invention.

FIG. 13 is a schematic diagram of a general structure of a zoom lens LA according to Embodiment 5 of the present invention.

FIG. 14 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a wide-angle end according to Embodiment 5 of the present invention.

FIG. 15 is a schematic diagram of a longitudinal aberration, an astigmatism field curvature and a distortion of the zoom lens LA at a telephoto end according to Embodiment 5 of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objectives, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiments of the zoom lens in the present invention are described below. The zoom lens LA has lens system of a lens structure having six pieces in four groups. The lens structure of six pieces in four groups, comprises from an object side to an image side in sequence, a first lens L1, a second lens group G2, a fifth lens L5, and a sixth lens L6. The second lens group G2 consists of a second lens L2, a third lens L3, and a fourth lens L4. A glass plate GF is provided between the sixth lens L6 and an image surface. The glass plate GF can be a glass cover plate or any optical filter. In the present invention, the glass plate GF can be provided at different positions, or can be omitted.

The first lens L1 has negative refractive power, the second lens group G2 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power. The second lens group G2 consists of the second lens L2, the third lens L3, and the fourth lens L4, the second lens L2 has positive refractive lens, the third lens L3 has negative refractive power, and the fourth lens L4 has negative refractive power. In order to correct various aberrations, it is desirable to design all surfaces of these six lenses as aspherical surfaces.

The zoom lens LA satisfies the following condition (1):

f_Tele/f_Wide≥1.80 (1)

The condition (1) specifies a zoom ratio of the zoom lens LA. When the condition (1) is satisfied, correction of each aberration is easily realized, and the zoom ratio becomes sufficient, which is an improvement.

The zoom lens LA satisfies the following condition (2):

−1.75≤f3/f2≤−1.35 (2).

The condition (2) specifies a ratio of a focal length f3 of the third lens L3 to a focal length f2 of the second lens L2. If it is within the range of condition (2), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The zoom lens LA satisfies the following condition (3):

−1.75≤f4/f2≤−1.35 (3)

The condition (3) specifies a ratio of a focal length f4 of the fourth lens L4 to a focal length f2 of the second lens L2. If it is within the range of condition (3), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The zoom lens LA satisfies the following condition (4).

−1.30≤f1/fG2≤−1.00 (4)

The condition (4) specifies a ratio of a focal length f1 of the first lens L1 to a combined focal length fG2 of the second lens group G2. If it is within the range of condition (4), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The zoom lens LA satisfies the following condition (5).

0.30≤f5/fG2≤0.40 (5)

The condition (5) specifies a ratio of a focal length f5 of the fifth lens L5 to a combined focal length fG2 of the second lens group G2. If it is within the range of condition (5), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The zoom lens LA satisfies the following condition (6).

−1.50≤f6/fG2≤−1.00 (6)

The condition (6) specifies a ratio of the focal length f6 of the sixth lens L6 to the combined focal length fG2 of the second lens group G2. If it is within the range of condition (6), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The zoom lens LA satisfies the following condition (7).

4.00≤LB_Tele/LB_Wide≤5.00 (7)

The condition (7) specifies a ratio of an on-axis distance LB_Tele from the image side surface S12 of the sixth lens L6 to the image surface at the telephoto end to an on-axis distance LB_Wide from the image side surface S12 of the sixth lens L6 to the image surface at the wide-angle end. If it is within the range of condition (7), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The zoom lens LA satisfies the following condition (8).

76.00≤v1≤82.00 (8)

The condition (8) specifies an Abbe number of the first lens L1. If it is within the range of the condition (8), miniaturization in the contracted state and correction of each aberration at the wide-angle end with FNO≤2.0 and zoom ratio ≥1.80 are easily achieved, which is an improvement.

The six lenses in four groups that form the zoom lens LA satisfy the above structure as well as the conditions, respectively, so that it is possible to obtain such a zoom lens as follows: the zoom lens becomes compact as TTL≤8.00 mm in the contracted state; while during imaging, the zoom lens becomes bright as FNO≤2.0 at a wide-angle end; and the zoom lens has good optical properties as well as a zoom ratio ≥1.80, and consists of six lenses in four groups.

EMBODIMENTS

The zoom lens LA the present invention will be described with reference to the embodiments below. The reference signs described in the embodiments are listed below. In addition, the distance, radius and center thickness are all in a unit of mm.

f denotes a focal length of the zoom lens LA.

f1 denotes a focal length of the first lens L1.

fG2 denotes a combined focal length of the second lens group G2.

f2 denotes a focal length of the second lens L2.

f3 denotes a focal length of the third lens L3.

f4 denotes a focal length of the fourth lens L4.

f5 denotes a focal length of the fifth lens L5.

f6 denotes a focal length of the sixth lens L6.

FNO denotes an aperture value (a ratio of an effective focal length of the zoom lens to a diameter of a pupil of entry), or F number.

2ω denotes a full field of view.

STOP denotes an aperture.

R denotes a curvature radius of an optical surface, or a central curvature radius for a lens.

R1 denotes a curvature radius of an object side surface S1 of the first lens L1.

R2 denotes a curvature radius of an image side surface S2 of the first lens L1.

R3 denotes a curvature radius of an object side surface S3 of the second lens L2.

R4 denotes a curvature radius of an image side surface S4 of the second lens L2.

R5 denotes a curvature radius of an object side surface S5 of the third lens L3.

R6 denotes a curvature radius of an image side surface S6 of the third lens L3.

R7 denotes a curvature radius of an object side surface S7 of the fourth lens L4.

R8 denotes a curvature radius of an image side surface S8 of the fourth lens L4.

R9 denotes a curvature radius of an object side surface S9 of the fifth lens L5.

R10 denotes a curvature radius of the image side surface S10 of the fifth lens L5.

R11 denotes a curvature radius of the object side surface S11 of the sixth lens L6.

R12 denotes a curvature radius of an image side surface S12 of the sixth lens L6.

R13 denotes a curvature radius of an object side surface S13 of the glass plate GF.

R14 denotes a curvature radius of an image side surface S14 of the glass plate GF.

d denotes an on-axis thickness or an on-axis distance between lenses.

d1 denotes an on-axis thickness of the first lens L1.

D12 denotes an on-axis distance from the image side surface S2 of the first lens L1 to the object side surface S3 of the second lens L2.

d2 denotes an on-axis distance from the image side surface S2 of the first lens L1 to the aperture STOP.

d3 denotes an on-axis distance from the aperture STOP to the object side surface S3 of the second lens L2.

d4 denotes an on-axis thickness of the first lens L2.

d5 denotes an on-axis distance from the image side surface S4 of the second lens L2 to the object side surface S5 of the third lens L3.

d6 denotes an on-axis thickness of the third lens L3.

d7 denotes an on-axis distance from the image side surface S6 of the third lens L3 to the object side surface S7 of the fourth lens L4.

d8 denotes an on-axis thickness of the fourth lens L4.

d9 denotes an on-axis distance from the image side surface S8 of the fourth lens L4 to the object side surface S9 of the fifth lens L5.

d10 denotes an on-axis thickness of the fifth lens L5.

d11 denotes an on-axis distance from the image side surface S10 of the fifth lens L5 to the object side surface S11 of the sixth lens L6.

d12 denotes an on-axis thickness of the sixth lens L6.

d13 denotes an on-axis distance from the image side surface S12 of the sixth lens L6 to the object side surface S13 of the glass plate GF.

d14 denotes an on-axis thickness of the glass plate GF.

d15 denotes an on-axis distance from the image side surface S14 of the glass plate GF to an image plane.

nd denotes a refractive index of d line.

nd1 denotes a refractive index of d line of the first lens L1.

nd2 denotes a refractive index of d line of the second lens L2.

nd3 denotes a refractive index of d line of the third lens L3.

nd4 denotes a refractive index of d line of the fourth lens L4.

nd5 denotes a refractive index of d line of the fifth lens L5.

nd6 denotes a refractive index of d line of the sixth lens L6.

ndg denotes a refractive index of d line of the glass plate GF.

v denotes an abbe number.

v1 denotes an abbe number of the first lens L1.

v2 denotes an abbe number of the second lens L2.

v3 denotes an abbe number of the third lens L3.

v4 denotes an abbe number of the fourth lens L4.

v5 denotes an abbe number of the fifth lens L5.

v6 denotes an abbe number of the sixth lens L6.

vg denotes an abbe number of the glass plate GF.

TTL denotes a total optical length (on-axis distance from the object side surface S1 of the first lens L1 to the image surface) of the camera lens. and

LB denotes an on-axis distance from the image side surface S12 of the sixth lens L6 to the image surface.

IH denotes an image height.

Embodiment 1

FIG. 1 is a schematic diagram of a zoom lens LA according to Embodiment 1 of the present invention. The curvature radiuses R of the image side surfaces and object side surfaces of the first lens L1 to the sixth lens L6 of the camera lens LA according to the Embodiment 1, the on-axis thicknesses of the lenses, or on-axis distances d between the lenses, refractive indexes nd, abbe numbers vd are shown in Table 1. Values of A-D during imaging and in the contracted state are shown in Table 2; conic coefficients k and aspheric coefficients are shown in Table 3; and FNO, 2ω, f, TTL, LB, f1, fG2, f2, f3, f4,

TABLE 1

R
d
nd
νd
Effective radius (mm)

S1
R1
7.67105
d1
0.719
nd1
1.5264
ν1
76.860
4.535

S2
R2
4.27375
D12
d2
A

3.923

Stop

∞

d3
−1.261

2.667

S3
R3
3.31060
d4
2.201
nd2
1.5438
ν2
56.029
2.670

S4
R4
−10.44730
d5
0.353

2.504

S5
R5
4.55214
d6
0.411
nd3
1.6153
ν3
25.936
2.154

S6
R6
2.35630
d7
0.583

1.890

S7
R7
−8.09266
d8
0.386
nd4
1.6700
ν4
19.392
1.878

S8
R8
11.80297
d9
B

1.845

S9
R9
7.55688
d10
0.783
nd5
1.6153
ν5
25.936
1.935

S10
R10
−7.66352
d11
C

1.906

S11
R11
10.46885
d12
0.400
nd6
1.5346
ν6
55.695
2.633

S12
R12
5.67503
d13
0.173

2.909

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
2.974

S14
R14
∞
d15
D

3.010

Reference wavelength = 587.6 nm

TABLE 2

Imaging

Wide
Tele
Contracted

A
9.953
1.478
1.461

B
0.225
0.633
0.200

C
4.122
1.591
0.360

D
1.040
6.661
0.890

TABLE 3

Cone coefficient
Aspheric surface coefficient

k
A4
A6
A8
A10

S1
0.0000E+00
−5.7385E−03
3.6299E−04
−2.0970E−05
1.3349E−06

S2
0.0000E+00
−8.2258E−03
6.3034E−04
−9.4459E−05
1.2558E−05

S3
−3.0952E−01
7.4776E−04
5.9198E−04
−4.1787E−04
1.7321E−04

S4
0.0000E+00
1.2256E−02
−2.4500E−03
5.9863E−04
−1.3437E−04

S5
0.0000E+00
−3.8659E−02
3.8995E−03
1.7269E−03
−9.8686E−04

S6
−7.6118E+00
−3.3312E−03
−1.7005E−02
1.4689E−02
−6.6600E−03

S7
−5.0000E+01
7.0086E−03
3.1047E−03
−2.8514E−03
1.8458E−03

S8
0.0000E+00
3.9299E−02
−1.6687E−02
9.4272E−03
−3.0949E−03

S9
0.0000E+00
2.8733E−02
−2.7964E−02
1.9781E−02
−8.2089E−03

S10
0.0000E+00
2.9511E−02
−3.5157E−02
3.2777E−02
−1.7888E−02

S11
−1.0888E+01
−1.7153E−02
2.6433E−03
−3.2400E−04
4.3365E−05

S12
−3.0710E+01
−5.1779E−03
−1.6955E−03
7.6430E−04
−1.4174E−04

Cone coefficient
Aspheric surface coefficient

k
A12
A14
A16

S1
0.0000E+00
−8.1503E−08
3.1114E−09
−4.9180E−11

S2
0.0000E+00
−1.1269E−06
5.4030E−08
−1.0782E−09

S3
−3.0952E−01
−3.7552E−05
4.1525E−06
−1.9096E−07

S4
0.0000E+00
1.6965E−05
−1.2495E−06
4.1593E−08

S5
0.0000E+00
2.3274E−04
−2.6947E−05
1.3007E−06

S6
−7.6118E+00
2.0674E−03
−3.7602E−04
3.0038E−05

S7
−5.0000E+01
−5.7675E−04
8.1320E−05
−4.3265E−06

S8
0.0000E+00
5.0214E−04
−3.6684E−05
6.1773E−07

S9
0.0000E+00
2.0668E−03
−2.9319E−04
1.9034E−05

S10
0.0000E+00
5.7863E−03
−1.0236E−03
7.7626E−05

S11
−1.0888E+01
−1.2835E−05
1.8482E−06
−9.0136E−08

S12
−3.0710E+01
9.1737E−06
1.6138E−07
−2.8105E−08

Herein, K is a conic coefficient, A4, A6, A8, A10, A12, A14, and A16 are aspheric surface coefficients.

y=(x²/R)/[1+{1−(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²±A14x¹⁴+A16x¹⁶ (9)

Herein, x is a vertical distance between a point on an aspherical curve and the optic axis, and y is an aspherical depth (a vertical distance between a point on an aspherical surface, having a distance of x from the optic axis, and a surface tangent to a vertex of the aspherical surface on the optic axis).

For convenience, an aspheric surface of each lens surface adopts the aspheric surfaces shown in the condition (9). However, the present invention is not limited to the aspherical polynomials form shown in the condition (8).

TABLE 4

Wide
Tele

Fno
1.96
2.84

2ω (°)
46.29
24.00

f (mm)
7.110
14.536

Wide
Tele
Contracted

TTL (mm)
20.298
15.323
7.870

LB (mm)
1.423
7.044
1.273

f1 (mm)
−19.776

f2 (mm)
15.970

f2 (mm)
4.899

f3 (mm)
−8.549

f4 (mm)
−7.110

f5 (mm)
6.308

f6 (mm)
−23.877

IH (mm)
3.074

Zoom ratio
2.044

The following Table 21 shows corresponding values of the parameters defined in the conditions (1) to (8) of Embodiments 1-5.

As shown in the Table 21, the embodiment 1 satisfies the conditions (1) to (8).

FIG. 2 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 1 at the wide-angle end. FIG. 3 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 1 at the telephoto end. It should be noted that, curvature S in the figures is a field curvature for a sagittal image plane, and T is a field curvature for a meridional image plane, which are the same for Embodiments 2-5. It can be known that the zoom lens LA of the embodiment 1 becomes compact as TTL=7.870 when contracted, while the zoom lens becomes bright when FNO=1.96 at the wide-angle end, and the zoom ratio=2.044 and the zoom lens has good optical properties, as shown in FIG. 2 and FIG. 3.

Embodiment 2

FIG. 4 is a schematic diagram of a zoom lens LA according to Embodiment 2 of the present invention. The curvature radiuses R of the image side surfaces and object side surfaces of the first lens L1 to the sixth lens L6 of the camera lens LA according to the Embodiment 2, the on-axis thicknesses of the lenses or on-axis distances d between the lenses, refractive indexes nd, abbe numbers vd are shown in Table 5. Values of A-D during imaging and in the contracted state are shown in Table 6; conic coefficients k and aspheric coefficients are shown in Table 7; and FNO, 2ω, f, TTL, LB, f1, fG2, f2, f3, f4, f5, f6, IH and zoom ratios are shown in Table 8.

TABLE 5

R
d
nd
νd
Effective radius (mm)

S1
R1
7.85611
d1
0.755
nd1
1.4959
ν1
81.655
4.400

S2
R2
4.27586
D12
d2
A

3.928

Stop

∞

d3
−1.181

2.653

S3
R3
3.34061
d4
2.249
nd2
1.5438
ν2
56.029
2.665

S4
R4
−9.29516
d5
0.348

2.505

S5
R5
5.01403
d6
0.369
nd3
1.6153
ν3
25.936
2.167

S6
R6
2.47207
d7
0.575

1.920

S7
R7
−7.39526
d8
0.372
nd4
1.6700
ν4
19.392
1.916

S8
R8
13.50619
d9
B

1.883

S9
R9
7.95199
d10
0.790
nd5
1.6153
ν5
25.936
1.976

S10
R10
−7.40039
d11
C

1.957

S11
R11
6.04949
d12
0.400
nd6
1.5346
ν6
55.695
2.633

S12
R12
3.88313
d13
0.367

2.825

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
2.891

S14
R14
∞
d15
D

2.933

Reference wavelength = 587.6 nm

TABLE 6

Imaging

Wide
Tele
Contracted

A
10.027
1.382
1.381

B
0.228
0.737
0.200

C
3.932
1.873
0.200

D
1.040
5.909
0.890

TABLE 7

Cone coefficient
Aspheric surface coefficient

k
A4
A6
A8
A10

S1
0.0000E+00
−5.7385E−03
3.6299E−04
−2.0970E−05
1.3349E−06

S2
0.0000E+00
−8.2258E−03
6.3034E−04
−9.4459E−05
1.2558E−05

S3
−3.4604E−01
7.4776E−04
5.9198E−04
−4.1787E−04
1.7321E−04

S4
0.0000E+00
1.2256E−02
−2.4500E−03
5.9863E−04
−1.3437E−04

S5
0.0000E+00
−3.8659E−02
3.8995E−03
1.7269E−03
−9.8686E−04

S6
−7.3622E+00
−4.0242E−03
−1.6553E−02
1.4133E−02
−6.3262E−03

S7
−4.9931E+01
7.0086E−03
3.1047E−03
−2.8514E−03
1.8458E−03

S8
0.0000E+00
2.2997E−02
5.1423E−03
−8.1196E−03
5.3772E−03

S9
0.0000E+00
5.6199E−03
6.3134E−03
−7.5190E−03
4.4893E−03

S10
0.0000E+00
1.5263E−02
−1.0533E−02
9.9879E−03
−5.5760E−03

S11
−1.0309E+01
−1.7153E−02
2.6433E−03
−3.2400E−04
4.3365E−05

S12
−1.3533E+01
−5.1779E−03
−1.6955E−03
7.6430E−04
−1.4174E−04

Cone coefficient
Aspheric surface coefficient

k
A12
A14
A16

S1
0.0000E+00
−8.1503E−08
3.1114E−09
−4.9180E−11

S2
0.0000E+00
−1.1269E−06
5.4030E−08
−1.0782E−09

S3
−3.4604E−01
−3.7552E−05
4.1525E−06
−1.9096E−07

S4
0.0000E+00
1.6965E−05
−1.2495E−06
4.1593E−08

S5
0.0000E+00
2.3274E−04
−2.6947E−05
1.3007E−06

S6
−7.3622E+00
1.9197E−03
−3.4188E−04
2.6649E−05

S7
−4.9931E+01
−5.7675E−04
8.1320E−05
−4.3265E−06

S8
0.0000E+00
−1.9020E−03
3.3746E−04
−2.4089E−05

S9
0.0000E+00
−1.3925E−03
2.1756E−04
−1.2913E−05

S10
0.0000E+00
1.8776E−03
−3.4725E−04
2.7684E−05

S11
−1.0309E+01
−1.2835E−05
1.8482E−06
−9.0136E−08

S12
−1.3533E+01
9.1737E−06
1.6138E−07
−2.8105E−08

TABLE 8

Wide
Tele

Fno
1.96
2.78

2ω (°)
46.91
24.64

f (mm)
7.110
14.220

Wide
Tele
Contracted

TTL (mm)
20.481
15.154
7.925

LB (mm)
1.617
6.486
1.467

f1 (mm)
−20.341

fG2 (mm)
16.293

f2 (mm)
4.821

f3 (mm)
−8.389

f4 (mm)
−7.081

f5 (mm)
6.354

f6 (mm)
−21.678

IH (mm)
3.074

Zoom ratio
2.000

As shown in the table 21, the embodiment 2 satisfies the conditions (1)˜(8).

FIG. 5 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 2 at the wide-angle end. FIG. 6 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 2 at the telephoto end. It can be known that the zoom lens LA of the embodiment 2 becomes compact when TTL=7.925 in the contracted state, while the zoom lens becomes bright when FNO=1.96 at the wide-angle end, and the zoom ratio=2.000 and the zoom lens has good optical properties, as shown in FIG. 5 and FIG. 6.

Embodiment 3

FIG. 7 is a schematic diagram of a zoom lens LA according to Embodiment 3 of the present invention. The curvature radiuses R of the image side surfaces and object side surfaces of the first lens L1 to the sixth lens L6 of the camera lens LA according to the Embodiment 3, the on-axis thicknesses of the lenses or on-axis distances d between the lenses, refractive indexes nd, abbe numbers vd are shown in Table 9. Values of A-D during imaging and in the contracted state are shown in Table 10; conic coefficients k and aspheric coefficients are shown in Table 11; and FNO, 2ω, f, TTL, LB, f1, fG2, f2, f3, f4, f5, f6, IH and zoom ratios are shown in Table 12.

TABLE 9

R
d
nd
νd
Effective radius (mm)

S1
R1
7.46267
d1
0.664
nd1
1.4959
ν1
81.655
4.380

S2
R2
4.26720

d2
A

3.945

Stop

∞
D12
d3
−1.198

2.656

S3
R3
3.42597
d4
2.105
nd2
1.5438
ν2
56.029
2.659

S4
R4
−10.42114
d5
0.575

2.505

S5
R5
6.09062
d6
0.350
nd3
1.6153
ν3
25.936
2.123

S6
R6
2.43733
d7
0.554

1.927

S7
R7
−5.83850
d8
0.383

1.917

S8
R8
−1.8486E+04
d9
B
nd4
1.6700
ν4
19.392
1.862

S9
R9
10.01671
d10
0.848
nd5
1.6153
ν5
25.936
1.920

S10
R10
−5.79361
d11
C

1.907

S11
R11
7.72372
d12
0.495
nd6
1.5346
ν6
55.695
2.593

S12
R12
4.55751
d13
0.228

2.825

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
2.877

S14
R14
∞
d15
D

2.924

Reference wavelength = 587.6 nm

TABLE 10

Imaging

Wide
Tele
Contracted

A
10.778
1.398
1.398

B
0.200
0.655
0.200

C
4.269
1.836
0.200

D
1.040
6.323
0.890

TABLE 11

Cone coefficient
Aspheric surface coefficient

k
A4
A6
A8
A10

S1
0.0000E+00
−5.7385E−03
3.6299E−04
−2.0970E−05
1.3349E−06

S2
0.0000E+00
−8.2258E−03
6.3034E−04
−9.4459E−05
1.2558E−05

S3
−2.9795E−01
7.4776E−04
5.9198E−04
−4.1787E−04
1.7321E−04

S4
0.0000E+00
1.2256E−02
−2.4500E−03
5.9863E−04
−1.3437E−04

S5
0.0000E+00
−3.8659E−02
3.8995E−03
1.7269E−03
−9.8686E−04

S6
−1.6152E+01
3.3119E−02
−5.2214E−02
3.1740E−02
−1.1387E−02

S7
−2.8609E+01
7.0086E−03
3.1047E−03
−2.8514E−03
1.8458E−03

S8
0.0000E+00
7.5818E−02
−6.9821E−02
5.9611E−02
−3.0265E−02

S9
0.0000E+00
5.3072E−02
−6.7867E−02
5.2936E−02
−2.3826E−02

S10
0.0000E+00
4.7580E−02
−7.0519E−02
6.4055E−02
−3.3541E−02

S11
−1.6562E+01
−1.7153E−02
2.6433E−03
−3.2400E−04
4.3365E−05

S12
−1.9405E+01
−5.1779E−03
−1.6955E−03
7.6430E−04
−1.4174E−04

Cone coefficient
Aspheric surface coefficient

k
A12
A14
A16

S1
0.0000E+00
−8.1503E−08
3.1114E−09
−4.9180E−11

S2
0.0000E+00
−1.1269E−06
5.4030E−08
−1.0782E−09

S3
−2.9795E−01
−3.7552E−05
4.1525E−06
−1.9096E−07

S4
0.0000E+00
1.6965E−05
−1.2495E−06
4.1593E−08

S5
0.0000E+00
2.3274E−04
−2.6947E−05
1.3007E−06

S6
−1.6152E+01
2.7453E−03
−4.0346E−04
2.6885E−05

S7
−2.8609E+01
−5.7675E−04
8.1320E−05
−4.3265E−06

S8
0.0000E+00
8.8179E−03
−1.3829E−03
9.0597E−05

S9
0.0000E+00
6.2820E−03
−8.9843E−04
5.4650E−05

S10
0.0000E+00
1.0269E−02
−1.7013E−03
1.1907E−04

S11
−1.6562E+01
−1.2835E−05
1.8482E−06
−9.0136E−08

S12
−1.9405E+01
9.1737E−06
1.6138E−07
−2.8105E−08

TABLE 12

Wide
Tele

Fno
1.97
2.77

2ω (°)
45.18
24.53

f (mm)
7.110
14.220

Wide
Tele
Contracted

TTL (mm)
21.500
15.425
7.902

LB (mm)
1.478
6.761
1.328

f1 (mm)
−21.582

fG2 (mm)
19.983

f2 (mm)
5.009

f3 (mm)
−6.854

f4 (mm)
−8.716

f5 (mm)
6.090

f6 (mm)
−21.995

IH (mm)
3.074

Zoom ratio
2.000

As shown in the table 21, the embodiment 3 satisfies the conditions (1)˜(8).

FIG. 8 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 3 at the wide-angle end. FIG. 9 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 3 at the telephoto end. It can be known that the zoom lens LA of the embodiment 3 becomes compact when TTL=7.902 in the contracted state, while the zoom lens becomes bright when FNO=1.97 at the wide-angle end, and the zoom ratio=2.000 and the zoom lens has good optical properties, as shown in FIG. 8 and FIG. 9.

Embodiment 4

FIG. 10 is a schematic diagram of a zoom lens LA according to Embodiment 4 of the present invention. The curvature radiuses R of the image side surfaces and object side surfaces of the first lens L1 to the sixth lens L6 of the camera lens LA according to the Embodiment 4, the on-axis thicknesses of the lenses or on-axis distances d between the lenses, refractive indexes nd, abbe numbers vd are shown in Table 13. Values of A-D during imaging and in the contracted state are shown in Table 14; conic coefficients k and aspheric coefficients are shown in Table 15; and FNO, 2ω, f, TTL, LB, f1, fG2, f2, f3, f4, f5, f6, IH and zoom ratios are shown in Table 16.

TABLE 13

R
d
nd
νd
Effective radius (mm)

S1
R1
7.81273
d1
0.742
nd1
1.4959
ν1
81.655
4.404

S2
R2
4.27534

d2
A

3.939

Stop

∞
D12
d3
−1.236

2.657

S3
R3
3.27848
d4
2.318
nd2
1.5438
ν2
56.029
2.663

S4
R4
−8.84845
d5
0.292

2.490

S5
R5
4.48611
d6
0.405
nd3
1.6153
ν3
25.936
2.129

S6
R6
2.29388
d7
0.596

1.847

S7
R7
−12.45891
d8
0.361
nd4
1.6700
ν4
19.392
1.836

S8
R8
6.64514
d9
B

1.878

S9
R9
6.79743
d10
0.803
nd5
1.6153
ν5
25.936
2.029

S10
R10
−8.18206
d11
C

1.995

S11
R11
8.46501
d12
0.400
nd6
1.5346
ν6
55.695
2.633

S12
R12
4.97780
d13
0.210

2.818

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
2.873

S14
R14
∞
d15
D

2.918

Reference wavelength = 587.6 nm

TABLE 14

Imaging

Wide
Tele
Contracted

A
10.147
1.436
1.436

B
0.273
0.828
0.200

C
3.860
1.547
0.270

D
1.040
6.193
0.890

TABLE 15

Cone coefficient
Aspheric surface coefficient

k
A4
A6
A8
A10

S1
0.0000E+00
−5.7385E−03
3.6299E−04
−2.0970E−05
1.3349E−06

S2
0.0000E+00
−8.2258E−03
6.3034E−04
−9.4459E−05
1.2558E−05

S3
−3.7362E−01
7.4776E−04
5.9198E−04
−4.1787E−04
1.7321E−04

S4
0.0000E+00
1.2256E−02
−2.4500E−03
5.9863E−04
−1.3437E−04

S5
0.0000E+00
−3.8659E−02
3.8995E−03
1.7269E−03
−9.8686E−04

S6
−5.6048E+00
−5.8591E−03
−1.4051E−02
1.3274E−02
−6.2680E−03

S7
−5.0000E+01
7.0086E−03
3.1047E−03
−2.8514E−03
1.8458E−03

S8
0.0000E+00
−3.2339E−03
2.8613E−02
−2.4274E−02
1.2332E−02

S9
0.0000E+00
−6.4725E−03
1.7074E−02
−1.3119E−02
5.7531E−03

S10
0.0000E+00
1.3225E−02
−1.0171E−02
1.1465E−02
−7.1844E−03

S11
−6.3466E+00
−1.7153E−02
2.6433E−03
−3.2400E−04
4.3365E−05

S12
−2.1190E+01
−5.1779E−03
−1.6955E−03
7.6430E−04
−1.4174E−04

Cone coefficient
Aspheric surface coefficient

k
A12
A14
A16

S1
0.0000E+00
−8.1503E−08
3.1114E−09
−4.9180E−11

S2
0.0000E+00
−1.1269E−06
5.4030E−08
−1.0782E−09

S3
−3.7362E−01
−3.7552E−05
4.1525E−06
−1.9096E−07

S4
0.0000E+00
1.6965E−05
−1.2495E−06
4.1593E−08

S5
0.0000E+00
2.3274E−04
−2.6947E−05
1.3007E−06

S6
−5.6048E+00
2.0450E−03
−3.9314E−04
3.3783E−05

S7
−5.0000E+01
−5.7675E−04
8.1320E−05
−4.3265E−06

S8
0.0000E+00
−3.6625E−03
5.7130E−04
−3.6576E−05

S9
0.0000E+00
−1.4046E−03
1.7690E−04
−8.2968E−06

S10
0.0000E+00
2.5340E−03
−4.6865E−04
3.6007E−05

S11
−6.3466E+00
−1.2835E−05
1.8482E−06
−9.0136E−08

S12
−2.1190E+01
9.1737E−06
1.6138E−07
−2.8105E−08

TABLE 16

Wide
Tele

Fno
1.96
2.78

2ω (°)
46.67
24.54

f (mm)
7.110
14.220

Wide
Tele
Contracted

TTL (mm)
20.422
15.105
7.898

LB (mm)
1.460
6.613
1.310

f1 (mm)
−20.462

fG2 (mm)
15.801

f2 (mm)
4.716

f3 (mm)
−8.207

f4 (mm)
−6.419

£5 (mm)
6.160

f6 (mm)
−23.544

IH (mm)
3.074

Zoom ratio
2.000

As shown in the table 21, the embodiment 4 satisfies the conditions (1)˜(8).

FIG. 11 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 4 at the wide-angle end. FIG. 12 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 4 at the telephoto end. It can be known that the zoom lens LA of the embodiment 4 becomes compact when TTL=7.898 in the contracted state, while the zoom lens becomes bright when FNO=1.96 at the wide-angle end, and the zoom ratio=2.000 and the zoom lens has good optical properties, as shown in FIG. 11 and FIG. 12.

Embodiment 5

FIG. 13 is a schematic diagram of a zoom lens LA according to Embodiment 5 of the present invention. The curvature radiuses R of the image side surfaces and object side surfaces of the first lens L1 to the sixth lens L6 of the camera lens LA according to the Embodiment 4, the on-axis thicknesses of the lenses or on-axis distances d between the lenses, refractive indexes nd, abbe numbers vd are shown in Table 17. Values of A-D during imaging and in the contracted state are shown in Table 18; conic coefficients k and aspheric coefficients are shown in Table 19; and FNO, 2ω, f, TTL, LB, f1, fG2, f2, f3, f4, f5, f6, IH and zoom ratios are shown in Table 20.

TABLE 17

R
d
nd
νd
Effective radius (mm)

S1
R1
7.70579
d1
0.756
nd1
1.4959
ν1
81.655
4.247

S2
R2
4.14214
D12
d2
A

3.755

Stop

∞

d3
−1.162

2.622

S3
R3
3.34187
d4
2.301
nd2
1.5438
ν2
56.029
2.631

S4
R4
−8.40418
d5
0.239

2.493

S5
R5
4.77669
d6
0.517
nd3
1.6153
ν3
25.936
2.206

S6
R6
2.22266
d7
0.617

1.885

S7
R7
−5.49224
d8
0.350
nd4
1.6700
ν4
19.392
1.862

S8
R8
35.94148
d9
B

1.876

S9
R9
6.54571
d10
0.774
nd5
1.6153
ν5
25.936
1.957

S10
R10
−7.56969
d11
C

1.982

S11
R11
19.40691
d12
0.400
nd6
1.5346
ν6
55.695
2.600

S12
R12
7.02181
d13
0.161

2.809

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
2.882

S14
R14
∞
d15
D

2.928

Reference wavelength = 587.6 nm

TABLE 18

Imaging

Wide
Tele
Contracted

A
9.208
1.362
1.362

B
0.218
0.659
0.200

C
4.000
1.641
0.250

D
1.040
6.424
0.890

TABLE 19

Cone coefficient
Aspheric surface coefficient

k
A4
A6
A8
A10

S1
0.0000E+00
−6.3542E−03
4.0075E−04
−2.2871E−05
1.4974E−06

S2
0.0000E+00
−8.9455E−03
6.2478E−04
−8.8072E−05
1.1746E−05

S3
−3.3426E−01
1.1348E−03
6.3258E−04
−4.4703E−04
1.7448E−04

S4
0.0000E+00
1.1410E−02
−2.4589E−03
5.8475E−04
−1.3561E−04

S5
0.0000E+00
−4.3633E−02
4.5756E−03
1.6932E−03
−9.9040E−04

S6
−3.7020E+00
−3.0930E−02
1.4048E−03
5.4655E−03
−2.6803E−03

S7
−5.0000E+01
1.2295E−02
3.0404E−03
−2.8075E−03
1.7203E−03

S8
0.0000E+00
4.2716E−02
−1.1983E−02
4.6692E−03
−1.2865E−03

S9
0.0000E+00
−2.3237E−03
5.0431E−03
−3.8428E−03
1.9235E−03

S10
0.0000E+00
4.4127E−03
1.9464E−03
−1.2628E−03
5.6504E−04

S11
4.6432E+01
−1.2665E−02
2.1486E−03
−5.2449E−04
1.0829E−04

S12
−3.1439E+01
−5.6632E−03
−3.7959E−04
2.6270E−04
−6.1321E−05

Cone coefficient
Aspheric surface coefficient

k
A12
A14
A16

S1
0.0000E+00
−8.5424E−08
2.9280E−09
−4.2182E−11

S2
0.0000E+00
−1.0825E−06
5.3958E−08
−1.1519E−09

S3
−3.3426E−01
−3.7121E−05
4.1253E−06
−1.9615E−07

S4
0.0000E+00
1.7300E−05
−1.1907E−06
3.4435E−08

S5
0.0000E+00
2.3183E−04
−2.6671E−05
1.2887E−06

S6
−3.7020E+00
8.3121E−04
−1.6594E−04
1.4556E−05

S7
−5.0000E+01
−5.7979E−04
8.1237E−05
−4.3620E−06

S8
0.0000E+00
1.4095E−04
−3.8184E−06
1.7913E−07

S9
0.0000E+00
−5.5964E−04
8.6588E−05
−5.2664E−06

S10
0.0000E+00
−1.4733E−04
1.8623E−05
−5.2950E−07

S11
4.6432E+01
−1.9436E−05
1.9010E−06
−7.8844E−08

S12
−3.1439E+01
6.4413E−06
−3.7189E−07
1.0931E−08

TABLE 20

Wide
Tele

Fno
1.95
2.81

2ω (°)
47.29
24.66

f (mm)
7.110
14.220

Wide
Tele
Contracted

TTL (mm)
19.627
15.249
7.864

LB (mm)
1.411
6.795
1.261

f1 (mm)
−19.426

fG2 (mm)
16.652

f2 (mm)
4.723

f3 (mm)
−7.321

f4 (mm)
−7.086

f5 (mm)
5.827

f6 (mm)
−20.816

IH (mm)
3.074

Zoom ratio
2.000

As shown in the table 21, the embodiment 5 satisfies the condition (1)˜(8).

FIG. 14 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 5 at the wide-angle end. FIG. 15 illustrates an axial spherical aberration, an astigmatism field curvature, and a distortion of the zoom lens LA according to Embodiment 5 at the telephoto end. It can be known that the zoom lens LA of the embodiment 5 becomes compact when TTL=7.864 in the contracted state, while the zoom lens becomes bright when FNO=1.95 at the wide-angle end, and the zoom ratio=2.000 and the zoom lens has good optical properties, as shown in FIG. 14 and FIG. 15.

The Table 21 shows the corresponding values of the parameters defined in the conditions (1) to (8) of Embodiments 1-5.

TABLE 21

Embodiment 1
Embodiment 2
Embodiment 3
Embodiment 4
Embodiment 5
Notes

f_Tele/f_Wide
2.044
2.000
2.000
2.000
2.000
Condition

(1)

f3/f2
−1.745
−1.740
−1.368
−1.740
−1.550
Condition

(3)

2f4/f2
−1.451
−1.469
−1.740
−1.361
−1.500
Condition

(3)

f1/fG2
−1.238
−1.248
−1.080
−1.295
−1.167
Condition

(4)

f5/fG2
0.395
0.390
0.305
0.390
0.350
Condition

(5)

f6/fG2
−1.495
−1.330
−1.101
−1.490
−1.250
Condition

(6)

LB_Tele/LB_Wide
4.950
4.010
4.575
4.529
4.816
Condition

(7)

ν1
76.860
81.655
81.655
81.655
81.655
Condition

(8)

It can be appreciated by one having ordinary skills in the art that the description above is only embodiments of the present invention. In practice, the one having ordinary skills in the art can make various modifications to these embodiments in forms and details without departing from the scope of the present invention.

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