TREA

ZOOM LENS

Follow

Information

  • Patent Application
  • 20220283414
  • Publication Number
    20220283414
  • Date Filed
    April 12, 2021
    3 years ago
  • Date Published
    September 08, 2022
    2 years ago
  • Inventors
  • Original Assignees
    • Changzhou Raytech Optronics Co., Ltd.
Information
Abstract
The present disclosure relates to optical lens, and provides a zoom lens including, 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 the optical axis; the fifth lens group including a fifth lens having a positive refractive power and a sixth lens having a negative refractive power; wherein the zoom lens satisfies conditions of: f_Tele/f_Wide>1.8; −1.85≤f3/f2≤−1.20; and 2.00≤f4/f2≤3.00.
Description
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 a focal length of the third lens to a focal length of the second lens, a ratio of a focal length of the fourth lens to a focal length of the second 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); −1.85≤f3/f2≤−1.20 (2); and 2.00≤f4/f2≤3.00 (3); 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; f2 denotes a focal length of the second lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens.


As an improvement, the zoom lens further satisfies a condition of: −3.20≤f1/f2≤−2.50 (4); where f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.


As an improvement, the zoom lens further satisfies a condition of: −5.00≤fG5/f2≤−2.50 (5); −3.10≤f5/f6≤−2.00 (6); where f2 denotes a focal length of the second lens; fG5 denotes a combined focal length of the fifth lens group; f5 denotes a focal length of the fifth lens; f6 denotes a focal length of the sixth lens.


As an improvement, the zoom lens further satisfies a condition of: 4.78≤LB_Tele/LB_Wide≤6.20 (7); where 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.


As an improvement, the zoom lens further satisfies a condition of: 76.00≤v1≤82.00 (8); 58.00≤v2≤78.00 (9); 76.00≤v6≤82.00 (10); where v1 denotes an abbe number of the first lens L1; v2 denotes an abbe number of the second lens L2; v6 denotes an abbe number of the sixth lens L6.


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. 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.



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



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.



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



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.



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



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.



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



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.





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:





−1.85≤f3/f2≤−1.20  (2)


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. 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:





2.00≤f4/f2≤3.00  (3)


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. 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:





−3.20≤f1/f2≤−2.50  (4)


Condition (4) specifies a ratio of a focal length f1 of the first lens L1 to a focal length f2 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:





−5.00≤fG5/f2≤−2.50  (5)


Condition (5) specifies a ratio of a combined focal length fG5 of the first lens L1 to a focal length f2 of the second lens L2. 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:





−3.10≤f5/f6≤−2.00  (6)


Condition (6) specifies a ratio of a focal length f5 of the fifth lens L5 to a focal length f6 of the six lens L6. 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:





4.78≤LB_Tele/LB_Wide≤6.20  (7)


Condition (7) specifies a ratio of an on-axis distance from an image-side surface of the sixth lens to an image surface at the telephoto end to an on-axis distance from an image-side surface of the sixth lens to an image surface at the wide angel 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:





76.00≤v1≤82.00  (8)


Condition (8) specifies an abbe number of the first lens L1. Within the condition (8), 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≤v2≤78.00  (9)


Condition (9) specifies an abbe number of the first lens L1. 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.


The zoom lens LA satisfies a condition of:





76.00≤v6≤82.00  (10)


Condition (10) specifies an abbe number of the first lens L1. Within the condition (10), 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 is obtained 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 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;


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 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 vd. 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
νd
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  (11)


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 (11). However, the present disclosure is not limited to the aspherical polynomials forms shown the formula (11).













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 (10) are shown.


As shown in Table 21, Embodiment 1 satisfies the conditions (1) to (10).



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 vd. 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
νd
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+01 
−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 (10).



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 vd. 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
νd
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
2.563


S6
R6
3.65515
d7
C




2.441


S7
R7
25.36114
d8
0.613
nd4
1.5438
ν4
56.029
2.530


S8
R8
−9.03460
d9
D




2.557


S9
R9
133.73082
d10
0.738
nd5
1.6700
ν5
19.392
3.429


S10
R10
−21.13099
d11
0.050




3.532


S11
R11
6.66943
d12
0.563
nd6
1.4959
ν6
81.655
3.551


S12
R12
3.24530
d13
0.410




3.791


S13
R13
∞
d14
0.210
ndg
1.5168
νg
64.167
3.825


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 (10).



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 vd. 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
νd
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 (10).



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 vd. 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
νd
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 (10).



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 (10).
















TABLE 21







Embodiment 1
Embodiment 2
Embodiment 3
Embodiment 4
Embodiment 5
Memo






















f_Tele/f_Wide
2.000
2.000
1.998
2.002
2.014
Condition (1)


f3/f2
−1.391
−1.802
−1.223
−1.616
−1.633
Condition (2)


f4/f2
2.012
2.242
2.123
2.991
2.012
Condition (3)


f1/f2
−3.183
−2.516
−2.916
1.727
−2.510
Condition (4)


fG5/f2
−3.435
−2.622
−4.903
−4.452
−3.101
Condition (5)


f5/f6
−2.196
−2.542
−2.024
−3.011
−2.184
Condition (6)


LB_Tele/LB_Wide
6.191
4.799
6.111
5.802
5.551
Condition (7)


ν1
81.655
81.655
81.655
81.655
76.860
Condition (8)


ν2
60.079
60.079
60.079
60.079
76.860
Condition (9)


ν6
81.655
81.655
81.655
81.655
76.860
Condition (10)









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.

Claims
  • 1. A zoom lens comprising, 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; wherein 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 comprises a fifth lens having a positive refractive power and a sixth lens having a negative refractive power;the zoom lens satisfies conditions of: f_Tele/f_Wide>1.8;  (1)−1.85≤f3/f2≤−1.20; and  (2)2.00≤f4/f2≤3.00;   (3)wheref_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;f2 denotes a focal length of the second lens;f3 denotes a focal length of the third lens; andf4 denotes a focal length of the fourth lens.
  • 2. The zoom lens according to claim 1, wherein the zoom lens further satisfies a condition of: −3.20≤f1/f2≤−2.50;  (4)wheref1 denotes a focal length of the first lens; andf2 denotes a focal length of the second lens.
  • 3. The zoom lens according to claim 1, wherein the zoom lens further satisfies a condition of: −5.00≤fG5/f2≤−2.50; and   (5)−3.10≤f5/f6≤−2.00;  (6)wheref2 denotes a focal length of the second lens;fG5 denotes a combined focal length of the fifth lens group;f5 denotes a focal length of the fifth lens; andf6 denotes a focal length of the sixth lens.
  • 4. The zoom lens according to claim 1, wherein the zoom lens further satisfies a condition of: 4.78≤LB_Tele/LB_Wide≤6.20;  (7)whereLB_Wide denotes an on-axis distance from an image-side surface of the sixth lens to an image surface at the wide angel end; andLB_Tele denotes an on-axis distance from an image-side surface of the sixth lens to an image surface at the telephoto end.
  • 5. The zoom lens according to claim 1, wherein the zoom lens further satisfies a condition of: 76.00≤v1≤82.00;  (8)58.00≤v2≤78.00; and  (9)76.00≤v6≤82.00;  (10)wherev1 denotes an abbe number of the first lens L1;v2 denotes an abbe number of the second lens L2; andv6 denotes an abbe number of the sixth lens L6.
Priority Claims (1)
Number Date Country Kind
2021035846 Mar 2021 JP national