Zoom lens

TECHNICAL FIELD

The present disclosure relates to a zoom lens which has a telescoping structure, particularly, to a zoom lens which is suitable for a smart phone or a camera using imaging elements such as Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor) for high pixels, and the like, and which becomes bright and has excellent optical performance when an F number (“Fno” hereinafter) is less than 2 at the wide angle end, which become miniature when a zoom ratio is more than 1.8 and a total track length (TTL) is less than 9.00 mm when contracted, and which includes five groups of lenses having six lenses.

BACKGROUND

In recent years, a zoom lens has been sought which has an Fno of less than 2 at the wide angle end, has a zoom ratio of more than 2.0 and excellent optical performance, and which becomes miniature when a barrel is contracted into the camera to reduce the TTL at the time of non-shooting.

A development for a zoom lens having six lenses is being advanced. As the zoom lens which includes six lenses, a lens which consists of three groups having six lenses is proposed in the US Patent Publication No. US2020/0241265A1 (Patent Document 1 hereinafter).

In the camera optical lens disclosed in Embodiments of Patent Document 1, a zoom ratio is more than 4.74. However, when the Fno is more than 2.552, the camera optical lens has insufficient brightness, and TTL is long when shooting and miniaturization thereof is insufficient.

SUMMARY

An objective of the present disclosure is to provide a zoom lens which has TTL of less than 9.00 mm and becomes miniature when contracted, which becomes bright when an Fno at the wide angle end is of less than 2.0 at the time of photographing, which has excellent optical performance and a zoom ratio of more than 1.8, and which includes five groups of lenses having six lenses.

In order to achieve the above objective, the inventor conceived in the present disclosure a zoom lens capable of solving the problem in the existing technology, by studying a ratio of an on-axis distance from an image-side surface of the six lens to an image surface at the telephoto end to an on-axis distance from an image-side surface of the six lens to an image surface at the wide angle end, an abbe of the first lens, an abbe of the second lens, an abbe of the six lens.

To solve the above technical problem, embodiments of the present disclosure provide a zoom lens. The zoom lens includes, from an object side to an image side in sequence: a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens group having a negative refractive power; distances between adjacent two of the first lens, the second lens, the third lens, the fourth lens and the fifth lens group are variable in the direction of an optical axis; the fifth lens group includes a fifth lens having a positive refractive power and a sixth lens having a negative refractive power; and the zoom lens satisfies conditions of: f_Tele/f_Wide>1.8 (1); 4.78≤LB_Tele/LB_Wide≤6.20 (2); and 76.00≤ν1≤82.00 (3); 58.00≤ν2≤78.00 (4); 76.00≤ν6≤82.00 (5); where f_Wide denotes a focal length of the zoom lens at the wide angle end; f_Tele denotes a focal length of the zoom lens at the telephoto end; LB_Wide denotes an on-axis distance from an image-side surface of the sixth lens to an image surface at the wide angel end; LB_Tele denotes an on-axis distance from an image-side surface of the sixth lens to an image surface at the telephoto end; ν1 denotes an abbe number of the first lens; ν2 denotes an abbe number of the second lens; and ν6 denotes an abbe number of the sixth lens.

As an improvement, the zoom lens further satisfies a condition of: 10.00≤D12_Wide/D12_Tele≤20.00 (6); where D12_Wide denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens at the wide angle end; and D12_Tele denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens at the telephoto end.

As an improvement, the zoom lens further satisfies a condition of: 0.68≤d5_Wide/d5_Tele≤1.20 (7); where d5_Wide denotes an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens at the wide angle end, and d5_Tele denotes an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens at the telephoto end.

As an improvement, the zoom lens further satisfies a condition of: 0.55≤d7_Wide/d7_Tele≤0.75 (8); where d7_Wide denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of the fourth lens at the wide angle end, and d7_Tele denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of the fourth lens at the telephoto end.

As an improvement, the zoom lens further satisfies a condition of: 15.00≤d9_Wide/d9_Tele≤22.50 (9); where d9_Wide denotes an on-axis distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens at the wide angle end, and d9_Tele denotes an on-axis distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens at the telephoto end.

The present disclosure is advantageous in follows.

According to the present disclosure, the zoom lens is provided, which is suitable for a camera module of a smart phone or a WEB camera using imaging elements such as Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor) for high pixels, and the like, and which has TTL of less than 9.00 mm and becomes miniature when contracted, which has Fno of less than 2.0, a zoom ratio of more than 1.8 and excellent optical performance and becomes bright, and which includes five groups of lenses having six lenses.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings for describing the embodiments or the prior art are introduced briefly in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

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

FIG. 3 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 1 of the present disclosure.

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

FIG. 6 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 2 of the present disclosure.

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

FIG. 9 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 3 of the present disclosure.

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

FIG. 12 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 4 of the present disclosure.

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

FIG. 15 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 5 of the present disclosure.

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 a zoom lens in the present disclosure will be described. The zoom lens is a lens system which includes five groups of lenses having six lenses. The lens system includes, from an object side to an image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens group G5, where the fifth lens group includes a fifth lens L5 and a sixth lens L6. A glass plate GF is disposed between the sixth lens L6 and an image surface Si. The glass plate GF may include glass cover plates, various filters, and the like. In the present disclosure, the glass plate GF may be disposed at different positions or may be omitted.

In this embodiment, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a positive refractive power, and the fifth lens group G5 has a negative refractive power. The fifth lens group G5 includes the fifth lens L5 and the sixth lens L6, where the fifth lens L5 has a positive refractive power, and the sixth lens L6 has a negative refractive power. For better correction to various distortions, all the surfaces of the six lenses are set as aspheric.

The zoom lens LA satisfies a condition of:

f_Tele/f_Wide>1.8 (1)

Condition (1) specifies a zoom ratio of the zoom lens LA. Within the condition (1), correction to various distortions is facilitated, and meanwhile the zoom ratio is sufficient.

The zoom lens LA satisfies a condition of:

4.78≤LB_Tele/LB_Wide≤6.20 (2)

Condition (2) specifies a ratio of an on-axis distance LB_Tele from an image-side surface S12 of the six lens L6 to an image surface at the telephoto end to an on-axis distance LB_Wide from an image-side surface S12 of the six lens L6 to an image surface at the wide angle end. Within the condition (2), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom LA satisfies a condition of:

76.00≤ν1≤82.00 (3)

Condition (3) specifies an abbe number ν1 of the first lens L1. Within the condition (3), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom lens LA satisfies a condition of:

58.00≤ν2≤78.00 (4)

Condition (4) specifies an abbe number ν2 of the second lens L2. Within the condition (4), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom lens LA satisfies a condition of:

76.00≤ν6≤82.00 (5)

Condition (5) specifies an abbe number ν6 of the sixth lens L6. Within the condition (5), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom LA satisfies a condition of:

10.00≤D12_Wide/D12_Tele≤20.00 (6)

Condition (6) specifies a ratio of an on-axis distance D12 Wide from an image-side surface S2 of the first lens L1 to an object-side surface S3 of the second lens L2 at the wide angle end to an on-axis distance D12 Tele from an image-side surface S2 of the first lens L1 to an object-side surface S3 of the second lens L2 at the telephoto end. Within the condition (6), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom lens LA satisfies a condition of:

0.68≤d5_Wide/d5_Tele≤1.20 (7)

Condition (7) specifies a ratio of an on-axis d5_Wide distance from an image-side surface S4 of the second lens L2 to an object-side surface S5 of the third lens L3 at the wide angle end to an on-axis distance d5 Tele from an image-side surface S4 of the second lens L2 to an object-side surface S5 of the third lens L3 at the telephoto end. Within the condition (7), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom lens LA satisfies a condition of:

0.55≤d7_Wide/d7_Tele≤0.75 (8)

Condition (8) specifies a ratio of an on-axis distance d7_Wide from an image-side surface S6 of the third lens L3 to an object-side surface S7 of the fourth lens L4 at the wide angle end to an on-axis distance d7 Tele from an image-side surface S6 of the third lens L3 to an object-side surface S7 of the fourth lens L4 at the telephoto end. abbe number of the first lens L1. Within the condition (8), miniaturiztaion when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

The zoom lens LA satisfies a condition of:

15.00≤d9_Wide/d9_Tele≤22.50 (9)

Condition (9) specifies a ratio of an on-axis distance d9_Wide from an image-side surface S8 of the fourth lens L4 to an object-side surface S9 of the fifth lens L5 at the wide angle end to an on-axis distance d9 Tele from an image-side surface S8 of the fourth lens L4 to an object-side surface S9 of the fifth lens L5 at the telephoto. Within the condition (9), miniaturization when contracted is facilitated, and meanwhile correction to various distortions is facilitated when Fno is less than 2.0 and the zoom ratio is more than 1.8 at the wide angle end.

With the five groups of lenses having six lenses included in the zoo lens LA satisfying the above structure and conditions respectively, the zoom lens LA which is obtained has TTL of less than 9.00 mm and becomes miniature when contracted, which has Fno of less than 2.0, a zoom ratio of more than 1.8 and an excellent optical performance and becomes bright, and which includes five groups of lenses having six lenses.

EMBODIMENTS

The zoom lens LA will be further described with reference to the following examples. Symbols used in various examples are shown as follows. It should be noted that the distance, central curvature radius, and on-axis thickness are all in units of mm.

f: focal length of the zoom 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;

f5: focal length of the fifth lens L5;

f6: focal length of the sixth lens L6;

fG5: combined focal length of the fifth lens group G5;

FNO: ratio of an effective focal length and an entrance pupil diameter of the zoom lens;

2ω: full viewing angle;

STOP: aperture;

R: curvature radius of an optical surface (central curvature radius in the condition of the lens);

R1: central curvature radius of the object-side surface S1 of the first lens L1;

R2: central curvature radius of the image-side surface S2 of the first lens L1;

R3: central curvature radius of the object-side surface S3 of the second lens L2;

R4: central curvature radius of the image-side surface S4 of the second lens L2;

R5: central curvature radius of the object-side surface S5 of the third lens L3;

R6: central curvature radius of the image-side surface S6 of the third lens L3;

R7: central curvature radius of the object-side surface S7 of the fourth lens L4;

R8: central curvature radius of the image-side surface S8 of the fourth lens L4;

R9: central curvature radius of the object-side surface S9 of the fifth lens L5;

R10: central curvature radius of the image-side surface S10 of the fifth lens L5;

R11: central curvature radius of the object-side surface S11 of the sixth lens L6;

R12: central curvature radius of the image-side surface S12 of the sixth lens L6;

R13: central curvature radius of an object-side surface S13 of the glass plate GF;

R14: central curvature radius of an image-side surface S14 of the glass plate GF;

d: on-axis thickness of a lens or an on-axis distance between lenses;

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

D12: 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: on-axis distance from the image-side surface S2 of the first lens L1 to the aperture STOP;

d3: on-axis distance from the aperture STOP to the object-side surface S3 of the second lens L2;

d4: on-axis thickness of the second lens L2;

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

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

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

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

d13: 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: on-axis thickness of the glass plate GF;

d15: on-axis distance from the image-side surface S14 of the glass plate GF to the object-side surface S15 of 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 glass plate GF;

νd: abbe number;

ν1: abbe number of the first lens L1;

ν2: abbe number of the second lens L2;

ν3: abbe number of the third lens L3;

ν4: abbe number of the fourth lens L4;

ν5: abbe number of the fifth lens L5;

ν6: abbe number of the sixth lens L6;

νg: abbe number of the glass plate GF;

TTL: Total optical length (on-axis distance from the object side surface S1 of the first lens L1 to the image surface of the zoom lens) in mm;

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

Embodiment 1

FIG. 1 is a schematic diagram of a structure of the zoom LA according to Embodiment 1 of the present disclosure. Table 1 shows the central curvature radiuses R of the object-side surfaces and the image-side surfaces of the zoom lens LA of the first lens L1 to the six lens L6, the on-axis thicknesses d of the lenses, the on-axis distances d between the lenses, the refractive indexes nd and the abbe numbers νd. Table 2 shows the values of A, B, C, D and E when contracted or photographing. Table 3 shows the conic coefficient k and the aspheric surface coefficients. Table 4 shows values of Fno, 2ω, f, TTL, LB, f1, f2, f3, f4, fG5, f5, f6, IH and zoom ratio.

The design data of the zoom LA in Embodiment 1 of the present disclosure are shown in Table 1.

TABLE 1

effective

R
d
nd
vd
radius (mm)

S1
R1
9.61540
d1
0.848
nd1
1.4959
ν1
81.655
4.789

S2
R2
4.78994
D12
d2
A

4.201

Stop

∞

d3
−0.875

3.058

S3
R3
5.43455
d4
1.945
nd2
1.5806
ν2
60.079
3.085

S4
R4
−10.30283
d5
B

3.068

S5
R5
4.22326
d6
0.418
nd3
1.6700
ν3
19.392
2.804

S6
R6
2.37762
d7
C

2.792

S7
R7
−72.30089
d8
0.643
nd4
1.5438
ν4
56.029
2.792

S8
R8
−6.42171
d9
D

2.768

S9
R9
−422.21458
d10
0.687
nd5
1.6700
ν5
19.392
3.482

S10
R10
−16.16554
d11
0.050

3.599

S11
R11
6.61558
d12
0.507
nd6
1.4959
ν6
81.655
3.617

S12
R12
2.97312
d13
0.380

3.798

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
3.868

S14
R14
∞
d15
E

3.890

Reference wavelength = 587.6 nm

TABLE 2

Photographing

Wide
Tele
Contracted

A
6.374
1.150
1.075

B
1.292
1.087
0.200

C
1.511
2.391
0.654

D
4.498
0.200
0.200

E
1.114
9.960
0.890

TABLE 3

Conic

coefficient
Aspheric surface coefficients

k
A4
A6
A8
A10

S1
0.0000E+00
−3.7161E−03
2.1150E−04
−8.6464E−06
3.2195E−07

S2
0.0000E+00
−5.0043E−03
2.7486E−04
−2.2796E−05
1.9983E−06

S3
−4.1073E−01
4.8828E−04
−2.6565E−05
1.2402E−05
−2.4815E−06

S4
0.0000E+00
2.6570E−03
−5.5477E−05
7.0596E−06
−5.7191E−06

S5
0.0000E+00
−4.3942E−02
1.0026E−02
−2.0167E−03
2.9806E−04

S6
−4.1210E+00
−2.6213E−02
7.1515E−03
−1.6809E−03
2.8826E−04

S7
0.0000E+00
−3.2293E−03
8.8623E−04
−3.9750E−04
1.3776E−04

S8
2.1814E−01
1.7419E−03
3.3061E−04
5.2942E−05
−1.0663E−05

S9
0.0000E+00
9.8434E−03
−4.1050E−03
1.0649E−03
−1.7264E−04

S10
0.0000E+00
1.4996E−02
−7.5983E−03
2.0379E−03
−2.9367E−04

S11
−5.0000E+01
−1.8444E−02
5.4669E−04
6.5146E−04
−1.1815E−04

S12
−1.0143E+01
−1.4135E−02
2.5607E−03
−2.9863E−04
1.8766E−05

Conic

coefficient
Aspheric surface coefficients

k
A12
A14
A16

S1
0.0000E+00
−9.9365E−09
2.2247E−10
−2.7730E−12

S2
0.0000E+00
−1.4272E−07
6.0406E−09
−1.1574E−10

S3
−4.1073E−01
1.6043E−07
6.0347E−09
−9.7092E−10

S4
0.0000E+00
1.0816E−06
−8.7358E−08
2.3508E−09

S5
0.0000E+00
−2.9519E−05
1.6781E−06
−4.0053E−08

S6
−4.1210E+00
−3.2808E−05
2.1394E−06
−5.9001E−08

S7
0.0000E+00
−1.8645E−05
1.0372E−06
−1.9847E−08

S8
2.1814E−01
7.9451E−06
−1.2973E−06
5.9210E−08

S9
0.0000E+00
1.6328E−05
−8.4011E−07
1.8139E−08

S10
0.0000E+00
2.3324E−05
−9.9462E−07
1.8163E−08

S11
−5.0000E+01
8.3999E−06
−2.6527E−07
3.0971E−09

S12
−1.0143E+01
−6.0983E−07
9.6600E−09
−5.9281E−11

Herein, k denotes a conic coefficient, A4, A6, A8, A10, A12, A14, A16 denote aspheric surface coefficients.

y=(x²/R)/[1+{1−(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶ (10)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (10). However, the present disclosure is not limited to the aspherical polynomials forms shown the formula (10).

TABLE 4

Wide
Tele

Fno
1.94
3.11

2ω (°)
46.96
24.13

f (mm)
9.252
18.503

Wide
Tele
Contracted

TTL (mm)
19.600
19.600
7.831

LB (mm)
1.704
10.550
1.480

f1 (mm)
−20.436

f2 (mm)
6.419

f3 (mm)
−8.931

f4 (mm)
12.915

fG5 (mm)
−22.052

f5 (mm)
25.069

f6 (mm)
−11.415

IH (mm)
4.000

Zoom ratio
2.000

In the subsequent Table 21, various parameters of Embodiments 1, 2, 3, 4 and 5 and values corresponding to the parameters specified in the above conditions (1) to (9) are shown.

As shown in Table 21, Embodiment 1 satisfies the conditions (1) to (9).

FIG. 2 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the wide angle end according to Embodiment 1 of the present disclosure. FIG. 3 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 1 of the present disclosure. It should be noted that a field curvature S is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction which are also employed in embodiments 2, 3, 4, and 5. It can be known that the zoom lens becomes miniature with TTL equal to 7.831 and becomes bright with Fno equal to 1.94, and has a zoom ratio equal to 2.000 at the wide angle end and has excellent optical performance as shown in FIG. 2 and FIG. 3 in Embodiment 1 of the present disclosure.

Embodiment 2

FIG. 4 is a schematic diagram of a structure of the zoom LA according to Embodiment 2 of the present disclosure. Table 5 shows the central curvature radiuses R of the object-side surfaces and the image-side surfaces of the zoom lens LA of the first lens L1 to the six lens L6, the on-axis thicknesses d of the lenses, the on-axis distances d between the lenses, the refractive indexes nd and the abbe numbers νd. Table 6 shows the values of A, B, C, D and E when contracted or photographing. Table 7 shows the conic coefficient k and the aspheric surface coefficients. Table 8 shows values of Fno, 2ω, f, TTL, LB, f1, f2, f3, f4, fG5, f5, f6, IH and zoom ratio.

TABLE 5

effective

R
d
nd
vd
radius (mm)

S1
R1
11.54916
d1
0.980
nd1
1.4959
ν1
81.655
4.604

S2
R2
4.52385
D12
d2
A

3.947

Stop

∞

d3
−1.131

3.190

S3
R3
4.79882
d4
2.206
nd2
1.5806
ν2
60.079
3.202

S4
R4
−12.36368
d5
B

3.127

S5
R5
8.18784
d6
0.400
nd3
1.6700
ν3
19.392
2.689

S6
R6
3.84986
d7
C

2.500

S7
R7
8.58565
d8
0.770
nd4
1.5438
ν4
56.029
2.990

S8
R8
−65.64031
d9
D

3.025

S9
R9
−16.92466
d10
0.557
nd5
1.6700
ν5
19.392
3.481

S10
R10
−8.47675
d11
0.309

3.476

S11
R11
85.55021
d12
0.500
nd6
1.4959
ν6
81.655
3.705

S12
R12
4.55212
d13
0.340

3.741

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
3.845

S14
R14
∞
d15
E

3.871

Reference wavelength = 587.6 nm

TABLE 6

Photographing

Wide
Tele
Contracted

A
5.904
1.533
1.333

B
1.301
1.884
0.200

C
2.951
3.988
0.620

D
3.315
0.221
0.200

E
0.989
6.835
0.890

TABLE 7

Conic

coefficient
Aspheric surface coefficients

k
A4
A6
A8
A10

S1
0.0000E+00
−4.3273E−03
3.0195E−04
−1.3551E−05
3.9245E−07

S2
0.0000E+00
−6.2743E−03
3.7607E−04
−2.5241E−05
1.4655E−06

S3
−5.5335E−01
2.6661E−04
−2.7405E−05
1.8364E−05
−4.2766E−06

S4
0.0000E+00
1.3787E−03
1.5428E−04
−6.0202E−05
1.0644E−05

S5
0.0000E+00
−2.6907E−02
6.5909E−03
−1.3197E−03
2.1250E−04

S6
−3.8955E+00
−2.5433E−02
7.8649E−03
−1.9084E−03
3.7605E−04

S7
0.0000E+00
−3.6049E−03
−1.8631E−04
−7.8918E−05
2.1912E−05

S8
4.6350E+01
−2.9343E−04
−4.3523E−04
3.9347E−05
−1.0555E−05

S9
0.0000E+00
4.3758E−03
−1.5179E−03
1.7440E−04
3.8823E−06

S10
0.0000E+00
1.1313E−02
−3.6859E−03
4.3334E−04
8.7735E−06

S11
−4.3256E+0 1
−1.0058E−02
7.6167E−04
−4.6670E−04
1.6076E−04

S12
−1.5106E+01
−6.3607E−03
2.8458E−04
−1.8017E−05
1.1228E−05

Conic

coefficient
Aspheric surface coefficients

k
A12
A14
A16

S1
0.0000E+00
−4.3114E−09
−9.6807E−11
2.4063E−12

S2
0.0000E+00
−9.2753E−08
4.2407E−09
−1.0222E−10

S3
−5.5335E−01
5.2175E−07
−3.1865E−08
7.6092E−10

S4
0.0000E+00
−1.0830E−06
5.9866E−08
−1.4064E−09

S5
0.0000E+00
−2.3490E−05
1.5289E−06
−4.3300E−08

S6
−3.8955E+00
−5.0004E−05
3.8761E−06
−1.2844E−07

S7
0.0000E+00
−3.5289E−06
3.3353E−07
−1.0855E−08

S8
4.6350E+01
1.8938E−06
−1.5287E−07
6.3304E−09

S9
0.0000E+00
−1.9526E−06
1.1519E−07
−1.7113E−09

S10
0.0000E+00
−5.5236E−06
3.8284E−07
−7.6534E−09

S11
−4.3256E+01
−2.2796E−05
1.4432E−06
−3.3666E−08

S12
−1.5106E+01
−2.0799E−06
1.4161E−07
−3.2697E−09

TABLE 8

Wide
Tele

Fno
1.96
3.10

2ω (°)
47.21
24.65

f (mm)
9.261
18.525

Wide
Tele
Contracted

TTL (mm)
19.600
19.600
8.383

LB (mm)
1.539
7.385
1.440

f1 (mm)
−15.723

f2 (mm)
6.249

f3 (mm)
−11.261

f4 (mm)
14.013

fG5 (mm)
−16.384

f5 (mm)
24.692

f6 (mm)
−9.715

IH (mm)
4.000

Zoom ratio
2.000

As shown in Table 21, Embodiment 2 satisfies the conditions (1) to (9).

FIG. 5 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the wide angle end according to Embodiment 2 of the present disclosure. FIG. 6 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 2 of the present disclosure. It can be known that the zoom lens becomes miniature with TTL equal to 8.383 and becomes bright with Fno equal to 1.96 and has a zoom ratio equal to 2.000 at the wide angle end and has excellent optical performance as shown in FIG. 5 and FIG. 6 in Embodiment 2 of the present disclosure.

Embodiment 3

FIG. 7 is a schematic diagram of a structure of the zoom LA according to Embodiment 3 of the present disclosure. Table 9 shows the central curvature radiuses R of the object-side surfaces and the image-side surfaces of the zoom lens LA of the first lens L1 to the six lens L6, the on-axis thicknesses d of the lenses, the on-axis distances d between the lenses, the refractive indexes nd and the abbe numbers νd. Table 10 shows the values of A, B, C, D and E when contracted or photographing. Table 11 shows the conic coefficient k and the aspheric surface coefficients. Table 12 shows values of Fno, 2ω, f, TTL, LB, f1, f2, f3, f4, fG5, f5, f6, IH and zoom ratio.

TABLE 9

effective

R
d
nd
vd
radius (mm)

S1
R1
10.58008
d1
1.042
nd1
1.4959
ν1
81.655
4.784

S2
R2
4.52948
D12
d2
A

4.108

Stop

∞

d3
−1.107

3.177

S3
R3
5.07855
d4
2.168
nd2
1.5806
ν2
60.079
3.187

S4
R4
−8.45974
d5
B

3.062

S5
R5
16.45587
d6
0.400
nd3
1.6700
ν3
19.392
2.363

S6
R6
3.65515
d7
C

2.441

S7
R7
25.36114
d8
0.613
nd4
1.5438
ν4
56.029
2.330

S8
R8
−9.03460
d9
D

2.337

S9
R9
133.73082
d10
0.738
nd5
1.6700
ν5
19.392
3.429

S10
R10
−21.13099
d11
0.050

3.332

S11
R11
6.66943
d12
0.563
nd6
1.4959
ν6
81.655
3.331

S12
R12
3.24530
d13
0.410

3.791

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
3.823

S14
R14
∞
d15
E

3.848

Reference wavelength = 587.6 nm

TABLE 10

Photographing

Wide
Tele
Contracted

A
6.273
1.440
1.310

B
1.444
1.413
0.200

C
1.018
1.425
0.643

D
4.656
0.207
0.200

E
1.122
10.028
0.890

TABLE 11

Conic

coefficient
Aspheric surface coefficients

k
A4
A6
A8
A10

S1
0.0000E+00
−4.4095E−03
2.0708E−04
−3.9038E−06
−1.9264E−07

S2
0.0000E+00
−6.3328E−03
2.7470E−04
−1.7528E−05
1.1901E−06

S3
−3.6269E−01
4.9698E−04
9.1645E−06
5.8361E−06
−1.8648E−06

S4
0.0000E+00
5.7932E−03
−4.6315E−04
4.4802E−05
−4.1143E−06

S5
0.0000E+00
−1.0829E−02
3.3479E−03
−8.3487E−04
1.3433E−04

S6
−4.0285E+00
−1.4720E−02
4.4418E−03
−1.0849E−03
1.7666E−04

S7
0.0000E+00
−6.8090E−03
4.4941E−04
1.9025E−04
−5.2820E−07

S8
4.1694E+00
5.6632E−04
2.3946E−04
2.1157E−04
−1.1785E−05

S9
0.0000E+00
3.6015E−03
−2.2196E−03
8.3091E−04
−1.6445E−04

S10
0.0000E+00
−7.2986E−03
2.0443E−03
1.4646E−04
−9.7643E−05

S11
−7.2588E+00
−4.4240E−02
1.2333E−02
−1.9295E−03
1.8668E−04

S12
−7.5252E+00
−1.5700E−02
3.2886E−03
−4.7529E−04
4.0819E−05

Conic

coefficient
Aspheric surface coefficients

k
A12
A14
A16

S1
0.0000E+00
2.0604E−08
−7.4463E−10
9.9131E−12

S2
0.0000E+00
−8.9260E−08
4.3084E−09
−1.0036E−10

S3
−3.6269E−01
3.0197E−07
−2.3163E−08
7.0698E−10

S4
0.0000E+00
3.2966E−07
−1.9572E−08
6.0139E−10

S5
0.0000E+00
−1.3718E−05
8.2984E−07
−2.2114E−08

S6
−4.0285E+00
−1.9160E−05
1.2721E−06
−3.6712E−08

S7
0.0000E+00
−7.6718E−06
9.7243E−07
−4.1555E−08

S8
4.1694E+00
−1.0882E−06
−3.6653E−08
7.6618E−09

S9
0.0000E+00
1.7312E−05
−9.4394E−07
2.0940E−08

S10
0.0000E+00
1.2379E−05
−6.9673E−07
1.5505E−08

S11
−7.2588E+00
−1.2020E−05
4.7200E−07
−8.0207E−09

S12
−7.5252E+00
−2.0251E−06
5.3252E−08
−5.6470E−10

TABLE 12

Wide
Tele

Fno
1.94
3.06

2ω (°)
47.74
24.12

f (mm)
9.237
18.455

Wide
Tele
Contracted

TTL (mm)
19.600
19.600
8.331

LB (mm)
1.742
10.648
1.510

f1 (mm)
−16.937

f2 (mm)
5.808

f3 (mm)
−7.102

f4 (mm)
12.327

fG5 (mm)
−28.472

f5 (mm)
27.286

f6 (mm)
−13.481

IH (mm)
4.000

Zoom ratio
1.998

As shown in Table 21, Embodiment 3 satisfies the conditions (1) to (9).

FIG. 8 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the wide angle end according to Embodiment 3 of the present disclosure. FIG. 9 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 3 of the present disclosure. It can be known that the zoom lens becomes miniature with TTL equal to 8.331 and becomes bright with Fno equal to 1.94 and has a zoom ratio equal to 1.998 at the wide angle end and has excellent optical performance as shown in FIG. 8 and FIG. 9 in Embodiment 3 of the present disclosure.

Embodiment 4

FIG. 10 is a schematic diagram of a structure of the zoom LA according to Embodiment 4 of the present disclosure. Table 13 shows the central curvature radiuses R of the object-side surfaces and the image-side surfaces of the zoom lens LA of the first lens L1 to the six lens L6, the on-axis thicknesses d of the lenses, the on-axis distances d between the lenses, the refractive indexes nd and the abbe numbers νd. Table 14 shows the values of A, B, C, D and E when contracted or photographing. Table 15 shows the conic coefficient k and the aspheric surface coefficients. Table 16 shows values of Fno, 2ω, f, TTL, LB, f1, f2, f3, f4, fG5, f5, f6, IH and zoom ratio.

TABLE 13

effective

R
d
nd
vd
radius (mm)

S1
R1
14.98234
d1
1.013
nd1
1.4959
ν1
81.655
4.634

S2
R2
5.26985
D12
d2
A

4.122

Stop

∞

d3
−1.047

3.153

S3
R3
5.04601
d4
2.161
nd2
1.5806
ν2
60.079
3.162

S4
R4
−9.92541
d5
B

3.081

S5
R5
5.74344
d6
0.400
nd3
1.6700
ν3
19.392
2.653

S6
R6
2.98243
d7
C

2.555

S7
R7
−32.32706
d8
0.589
nd4
1.5438
ν4
56.029
2.734

S8
R8
−7.62534
d9
D

2.712

S9
R9
17.33172
d10
0.759
nd5
1.6700
ν5
19.392
3.439

S10
R10
34.53207
d11
0.205

3.552

S11
R11
5.78882
d12
0.625
nd6
1.4959
ν6
81.655
3.559

S12
R12
3.30504
d13
0.390

3.810

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
3.838

S14
R14
∞
d15
E

3.860

Reference wavelength = 587.6 nm

TABLE 14

Photographing

Wide
Tele
Contracted

A
6.050
1.297
1.247

B
1.240
1.194
0.200

C
1.581
2.678
0.660

D
4.383
0.200
0.200

E
1.042
8.927
0.890

TABLE 15

Conic

coefficient
Aspheric surface coefficients

k
A4
A6
A8
A10

S1
0.0000E+00
−3.7536E−03
2.2036E−04
−1.0070E−05
4.2179E−07

S2
0.0000E+00
−5.1108E−03
2.7540E−04
−1.8794E−05
1.1984E−06

S3
−5.1704E−01
3.5277E−04
3.0334E−05
−9.5870E−06
2.3186E−06

S4
0.0000E+00
2.5600E−03
4.2044E−05
−4.4946E−05
8.1661E−06

S5
0.0000E+00
−3.3766E−02
8.2127E−03
−1.7569E−03
2.7773E−04

S6
−4.8937E+00
−2.2706E−02
7.0416E−03
−1.7633E−03
3.2056E−04

S7
0.0000E+00
4.7585E−04
6.9018E−04
−7.4376E−06
7.4010E−06

S8
−1.1589E+01
1.1854E−04
9.4606E−04
−7.7468E−06
1.1519E−06

S9
0.0000E+00
3.4171E−03
−1.3641E−03
4.1669E−04
−8.5975E−05

S10
0.0000E+00
−5.7698E−03
1.7512E−03
−1.8602E−04
−5.6310E−06

S11
−4.0247E+00
−4.3700E−02
1.0875E−02
−1.7947E−03
2.0457E−04

S12
−7.4985E+00
−1.8283E−02
4.0547E−03
−6.2900E−04
6.4181E−05

Conic

coefficient
Aspheric surface coefficients

k
A12
A14
A16

S1
0.0000E+00
−1.3804E−08
2.8803E−10
−2.7601E−12

S2
0.0000E+00
−6.1311E−08
1.9359E−09
−2.8147E−11

S3
−5.1704E−01
−3.3809E−07
2.5780E−08
−8.4890E−10

S4
0.0000E+00
−8.5217E−07
4.8947E−08
−1.2589E−09

S5
0.0000E+00
−2.8852E−05
1.7428E−06
−4.5614E−08

S6
−4.8937E+00
−3.7570E−05
2.5214E−06
−7.1912E−08

S7
0.0000E+00
−8.7561E−07
−1.0308E−07
1.0630E−08

S8
−1.1589E+01
1.9139E−06
−4.8498E−07
2.7389E−08

S9
0.0000E+00
9.3294E−06
−5.2187E−07
1.1906E−08

S10
0.0000E+00
2.2998E−06
−1.7674E−07
4.8751E−09

S11
−4.0247E+00
−1.5144E−05
6.1970E−07
−1.0232E−08

S12
−7.4985E+00
−4.0456E−06
1.3823E−07
−1.9138E−09

TABLE 16

Wide
Tele

Fno
1.96
3.10

2ω (°)
46.99
24.12

f (mm)
9.253
18.526

Wide
Tele
Contracted

TTL (mm)
19.600
19.600
8.501

LB (mm)
1.642
9.527
1.490

f1 (mm)
−16.979

f2 (mm)
6.084

f3 (mm)
−9.831

f4 (mm)
18.198

fG5 (mm)
−27.090

f5 (mm)
51.027

f6 (mm)
−16.945

IH (mm)
4.000

Zoom ratio
2.002

As shown in Table 21, Embodiment 4 satisfies the conditions (1) to (9).

FIG. 11 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the wide angle end according to Embodiment 4 of the present disclosure. FIG. 12 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 4 of the present disclosure. It can be known that the zoom lens becomes miniature with TTL equal to 8.501 and becomes bright with Fno equal to 1.96 and has a zoom ratio equal to 2.002 at the wide angle end and has excellent optical performance as shown in FIG. 11 and FIG. 12 in Embodiment 4 of the present disclosure.

Embodiment 5

FIG. 13 is a schematic diagram of a structure of the zoom LA according to Embodiment 5 of the present disclosure. Table 17 shows the central curvature radiuses R of the object-side surfaces and the image-side surfaces of the zoom lens LA of the first lens L1 to the six lens L6, the on-axis thicknesses d of the lenses, the on-axis distances d between the lenses, the refractive indexes nd and the abbe numbers νd. Table 18 shows the values of A, B, C, D and E when contracted or photographing. Table 19 shows the conic coefficient k and the aspheric surface coefficients. Table 20 shows values of Fno, 2ω, f, TTL, LB, f1, f2, f3, f4, fG5, f5, f6, IH and zoom ratio.

TABLE 17

effective

R
d
nd
vd
radius (mm)

S1
R1
14.54031
d1
0.932
nd1
1.5264
ν1
76.860
4.584

S2
R2
5.48677
D12
d2
A

4.128

Stop

∞

d3
−1.020

3.134

S3
R3
5.00546
d4
2.099
nd2
1.5264
ν2
76.860
3.144

S4
R4
−11.41165
d5
B

3.107

S5
R5
4.72445
d6
0.400
nd3
1.6700
ν3
19.392
2.680

S6
R6
2.80958
d7
C

2.648

S7
R7
−28.21289
d8
0.639
nd4
1.5438
ν4
56.029
2.747

S8
R8
−6.01316
d9
D

2.724

S9
R9
−35.22355
d10
0.847
nd5
1.6700
ν5
19.392
3.413

S10
R10
−11.12353
d11
0.050

3.516

S11
R11
6.55954
d12
0.725
nd6
1.5264
ν6
76.860
3.517

S12
R12
2.95172
d13
0.430

3.811

S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
3.843

S14
R14
∞
d15
E

3.865

Reference wavelength = 587.6 nm

TABLE 18

Photographing

Wide
Tele
Contracted

A
6.028
1.271
1.221

B
2.355
2.272
0.200

C
1.155
1.876
0.680

D
3.713
0.200
0.200

E
1.037
8.668
0.890

TABLE 19

Conic

coefficient
Aspheric surface coefficients

k
A4
A6
A8
A10

S1
0.0000E+00
−3.4372E−03
1.9939E−04
−8.9861E−06
3.3833E−07

S2
0.0000E+00
−4.5696E−03
2.3843E−04
−1.4091E−05
6.7722E−07

S3
−6.1134E−01
1.2020E−04
4.7405E−05
−1.4912E−05
3.4106E−06

S4
0.0000E+00
1.5507E−03
−1.2703E−05
−2.3469E−06
2.9676E−07

S5
0.0000E+00
−2.9557E−02
4.9607E−03
−7.3211E−04
7.3824E−05

S6
−4.0488E+00
−1.8215E−02
3.6392E−03
−5.8151E−04
5.8514E−05

S7
0.0000E+00
−3.2762E−03
6.4781E−04
−1.1358E−04
7.8336E−05

S8
−8.8647E+00
−4.1463E−03
9.4507E−04
2.3621E−05
−3.4675E−06

S9
0.0000E+00
9.1110E−03
−2.6888E−03
6.0171E−04
−8.8958E−05

S10
0.0000E+00
8.4438E−03
−3.4629E−03
9.4445E−04
−1.3749E−04

S11
−5.7915E+00
−3.2471E−02
4.9171E−03
−3.0991E−04
9.4133E−07

S12
−6.7555E+00
−1.7289E−02
3.2197E−03
−4.1572E−04
3.5257E−05

Conic

coefficient
Aspheric surface coefficients

k
A12
A14
A16

S1
0.0000E+00
−9.3236E−09
1.6970E−10
−1.5497E−12

S2
0.0000E+00
−2.7519E−08
8.1238E−10
−1.2348E−11

S3
−6.1134E−01
−4.4619E−07
3.0616E−08
−8.9323E−10

S4
0.0000E+00
−6.9638E−08
8.0230E−09
−3.6431E−10

S5
0.0000E+00
−5.1003E−06
2.6712E−07
−8.2591E−09

S6
−4.0488E+00
−3.4616E−06
1.3256E−07
−2.9525E−09

S7
0.0000E+00
−1.2556E−05
7.3534E−07
−1.3887E−08

S8
−8.8647E+00
6.8276E−06
−1.2375E−06
5.8817E−08

S9
0.0000E+00
7.5377E−06
−3.4555E−07
6.7229E−09

S10
0.0000E+00
1.0482E−05
−4.1404E−07
6.8885E−09

S11
−5.7915E+00
4.1863E−07
3.3193E−09
−4.5789E−10

S12
−6.7555E+00
−1.9038E−06
5.7222E−08
−6.9007E−10

TABLE 20

Wide
Tele

Fno
1.96
3.13

2ω (°)
46.73
23.91

f (mm)
9.254
18.635

Wide
Tele
Contracted

TTL (mm)
19.600
19.600
8.503

LB (mm)
1.677
9.308
1.530

f1 (mm)
−17.356

f2 (mm)
6.914

f3 (mm)
−11.292

f4 (mm)
13.911

fG5 (mm)
−21.439

f5 (mm)
23.926

f6 (mm)
−10.954

IH (mm)
4.000

Zoom ratio
2.014

As shown in Table 21, Embodiment 5 satisfies the conditions (1) to (9).

FIG. 14 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the wide angle end according to Embodiment 5 of the present disclosure. FIG. 15 is a schematic diagram showing longitudinal spherical aberrations, astigmatic field curves and distortions of the zoom lens LA at the telephoto end according to Embodiment 5 of the present disclosure. It can be known that the zoom lens becomes miniature with TTL equal to 8.503 and becomes bright with Fno equal to 1.96 and has a zoom ratio equal to 2.014 at the wide angle end and has excellent optical performance as shown in FIG. 14 and FIG. 15 in Embodiment 5 of the present disclosure.

Table 21 shows various parameters of Embodiments 1, 2, 3, 4 and 5 and values corresponding to the parameters specified in the above conditions (1) to (9).

TABLE 21

Embodiment 1
Embodiment 2
Embodiment 3
Embodiment 4
Embodiment 5
Memo

f_Tele/
2.000
2.000
1.998
2.002
2.014
Condition

f_Wide

(1)

LB_Tele/
6.191
4.799
6.111
5.802
5.551
Condition

LB_Wide

(2)

ν1
81.655
81.655
81.655
81.655
76.860
Condition

(3)

ν2
60.079
60.079
60.079
60.079
76.860
Condition

(4)

ν6
81.655
81.655
81.655
81.655
76.860
Condition

(5)

D12_Wide/
19.992
11.876
15.480
19.990
19.991
Condition

D12_Te1e

(6)

d5_Wide/
1.189
0.691
1.021
1.038
1.036
Condition

d5_Tele

(7)

d7_Wide/
0.632
0.740
0.715
0.591
0.616
Condition

d7_Tele

(8)

d9_Wide/
22.490
15.011
22.490
21.914
18.565
Condition

d9_Tele

(9)

It will be understood by those of ordinary skill in the art that the embodiments described above are specific embodiments realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure.

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

CPC

Field of Search

CPC

International Classifications

Abstract

Description

Claims

Priority Claims (1)

Foreign Referenced Citations (1)