A zoom lens

Abstract

The embodiment of the present invention discloses a zoom lens. The zoom lens includes a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, and a fourth lens group with positive focal power, which are arranged in sequence from the object side to the image side along the optical axis. The second lens group and the third lens group move back and forth along the optical axis during zooming; wherein the first lens group includes a first lens and a second lens, the second lens group includes a third lens, a fourth lens, and a fifth lens, the third lens group includes a sixth lens, a seventh lens, and an eighth lens, and the fourth lens group includes a ninth lens and a tenth lens; and further includes an aperture, which is located between the sixth lens and the seventh lens. The solution of the embodiment of the present invention can realize a high-performance zoom lens with a diagonal field of view of about 10° to 50° under a 1 / 2-inch CMOS target surface, and can meet imaging requirements when used in an environment of ‑40°C to 80°C.

Description

Technical Field

[0001] The embodiments of the present invention relate to lens technology, and in particular to a zoom lens. Background Art

[0002] With the continuous development of society and the continuous advancement of science and technology, optical imaging lenses have also developed rapidly in recent years. Optical imaging lenses are widely used in video conferencing, security monitoring, vehicle-mounted monitoring, drone aerial photography, smart transportation and other fields.

[0003] Since the field of view of a fixed-focus lens is fixed, a product can only be used in specific scenes, resulting in the failure of fixed-focus lenses to meet the use requirements in many scenes. Zoom lenses can change the shooting range by changing the focal length without changing the shooting distance, so they are becoming more and more widely used.

[0004] However, the zoom lenses currently on the market for security monitoring, drone aerial photography and other fields still have many shortcomings, such as a large number of lenses, low imaging resolution, small imaging surface, large size, etc., so they need to be improved. Summary of the invention

[0005] The embodiment of the present invention provides a zoom lens, which is a four-element zoom lens to realize a high-resolution optical lens with an ultra-large target surface and high magnification. The zoom lens uses 10 lenses, can realize a high-performance zoom lens with a diagonal field angle from about 10° to 50° under a 1 / 2-inch CMOS target surface, and can meet imaging requirements when used in an environment of -40°C to 80°C.

[0006] An embodiment of the present invention provides a zoom lens, comprising a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, and a fourth lens group with positive optical power, which are arranged in sequence from the object side to the image side along an optical axis, wherein the second lens group and the third lens group reciprocate along the optical axis during zooming;

[0007] The first lens group includes a first lens and a second lens, the second lens group includes a third lens, a fourth lens and a fifth lens, the third lens group includes a sixth lens, a seventh lens and an eighth lens, and the fourth lens group includes a ninth lens and a tenth lens;

[0008] Also included is an aperture stop, which is located between the sixth lens and the seventh lens.

[0009] The zoom lens provided by the embodiment of the present invention comprises a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power and a fourth lens group with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis, and the second lens group and the third lens group move back and forth along the optical axis during zooming; wherein the first lens group comprises a first lens and a second lens, the second lens group comprises a third lens, a fourth lens and a fifth lens, the third lens group comprises a sixth lens, a seventh lens and an eighth lens, and the fourth lens group comprises a ninth lens and a tenth lens; and further comprises an aperture stop located between the sixth lens and the seventh lens. The zoom lens is switched between the wide-angle end and the telephoto end by reciprocating the second lens group and the third lens group along the optical axis during zooming, wherein the total effective focal length of the zoom lens is continuously zoomed within the range of 10mm to 45mm; by reasonably designing the structure of each lens and the relationship between the optical power matching, the zoom lens achieves a high-performance zoom lens with a diagonal field angle ranging from about 10° to 50° under a 1 / 2-inch CMOS target surface, and meets imaging requirements when used in an environment of -40℃ to 80℃. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure of a wide-angle end of a zoom lens provided by an embodiment of the present invention;

[0011] Figure 2 for Figure 1 Schematic diagram of the structure of the telephoto end of a medium zoom lens;

[0012] Figure 3 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment;

[0013] Figure 4 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment;

[0014] Figure 5 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment;

[0015] Figure 6 is a light fan diagram of a zoom lens at the telephoto end in this embodiment;

[0016] Figure 7 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment;

[0017] Figure 8 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment;

[0018] Fig. 9 A schematic diagram of the structure of another zoom lens at the wide-angle end provided by an embodiment of the present invention;

[0019] Fig.10 for Fig. 9Schematic diagram of the structure of the telephoto end of a medium zoom lens;

[0020] Fig.11 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment;

[0021] Fig.12 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment;

[0022] Fig.13 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment;

[0023] Fig.14 is a light fan diagram of a zoom lens at the telephoto end in this embodiment;

[0024] Fig.15 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment;

[0025] Fig.16 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment;

[0026] Fig.17 A schematic diagram of the structure of another zoom lens at the wide-angle end provided by an embodiment of the present invention;

[0027] Fig.18 for Fig.17 Schematic diagram of the structure of the telephoto end of a medium zoom lens;

[0028] Fig.19 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment;

[0029] Fig. 20 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment;

[0030] Fig.21 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment;

[0031] Fig. 22 is a light fan diagram of a zoom lens at the telephoto end in this embodiment;

[0032] Fig.23 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment;

[0033] Fig.24 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment;

[0034] Fig.25 A schematic diagram of the structure of another zoom lens at the wide-angle end provided by an embodiment of the present invention;

[0035] Fig.26 for Fig.25Schematic diagram of the structure of the telephoto end of a medium zoom lens;

[0036] Fig. 27 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment;

[0037] Fig.28 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment;

[0038] Fig.29 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment;

[0039] Fig.30 is a light fan diagram of a zoom lens at the telephoto end in this embodiment;

[0040] Fig.31 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment;

[0041] Fig.32 4 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second" and the like are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0044] Figure 1 A schematic diagram of the structure of a zoom lens at the wide-angle end provided by an embodiment of the present invention. Figure 1The zoom lens provided by the embodiment of the present invention comprises a first lens group 10 with positive optical power, a second lens group 20 with negative optical power, a third lens group 30 with positive optical power and a fourth lens group 40 with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis. The second lens group 20 and the third lens group 30 move back and forth along the optical axis during zooming; wherein the first lens group 10 comprises a first lens 101 and a second lens 102, the second lens group 20 comprises a third lens 201, a fourth lens 202 and a fifth lens 203, the third lens group 30 comprises a sixth lens 301, a seventh lens 302 and an eighth lens 303, the fourth lens group 40 comprises a ninth lens 401 and a tenth lens 402; and further comprises an aperture 50, which is located between the sixth lens 301 and the seventh lens 302.

[0045] It can be understood that the focal power is the reciprocal of the focal length, which characterizes the ability of the optical system to bend light. The larger the absolute value of the focal power, the stronger the ability to bend light, and the smaller the absolute value of the focal power, the weaker the ability to bend light. When the focal power is a positive number, the refraction of light is convergent; when the focal power is a negative number, the refraction of light is divergent. In this embodiment, the first lens group 10, the second lens group 20, the third lens group 30 and the fourth lens group 40 can be arranged in a lens barrel ( Figure 1 (not shown in the figure), the focal length of the lens is changed by moving the second lens group 20 and the third lens group 30. By setting the optical focal length relationship of each lens group, the total effective focal length of the zoom lens can be continuously zoomed in the range of 10mm to 45mm.

[0046] The technical solution of this embodiment is to switch the zoom lens between the wide-angle end and the telephoto end by reciprocating the second lens group and the third lens group along the optical axis during zooming, wherein the total effective focal length of the zoom lens is continuously zoomed within the range of 10mm to 45mm; by reasonably designing the structure of each lens and the relationship between the optical power matching, the zoom lens can achieve a high-performance zoom lens with a diagonal field angle of about 10° to 50° under a 1 / 2-inch CMOS target surface, and can meet imaging requirements when used in an environment of -40℃ to 80℃.

[0047] Optionally, the first lens 101 has positive focal power, the second lens 102 has negative focal power, the third lens 201 has negative focal power, the fourth lens 202 has positive focal power, the fifth lens 203 has negative focal power, the sixth lens 301 has positive focal power, the seventh lens 302 has positive focal power, the eighth lens 303 has negative focal power, the ninth lens 401 has positive focal power or negative focal power, and the tenth lens 402 has positive focal power. Good imaging effect can be achieved by comprehensively setting the focal power of each lens.

[0048] Optionally, the first lens 101 is a biconvex spherical lens, the second lens 102 is a concave-convex spherical lens, the third lens 201 is a convex-concave spherical lens, the fourth lens 202 is a concave-convex spherical lens, the fifth lens 203 is a biconcave spherical lens, the sixth lens 301 is a biconvex aspheric lens, the seventh lens 302 is a biconvex spherical lens, the eighth lens 303 is a biconcave spherical lens, the ninth lens 401 is a concave-convex or convex-concave aspheric lens, and the tenth lens 402 is a convex-concave aspheric lens.

[0049] It can be understood that the above-mentioned lens shapes are only schematic, and the shape of each lens can be designed according to actual conditions during implementation.

[0050] Among them, the aspheric lens surface shape satisfies the formula:

[0051]

[0052] Among them, Z represents the sagittal height of the aspheric surface, c represents the basic curvature at the vertex, k represents the conic constant, r represents the radial coordinate in the direction perpendicular to the optical axis, and a i is the coefficient of the higher order term, a i r 2i is the high-order term of the aspheric surface.

[0053] Optionally, the first lens 101 and the second lens 102 form a cemented lens, the fourth lens 202 and the fifth lens 203 form a cemented lens, and the seventh lens 302 and the eighth lens 303 form a cemented lens, which is beneficial for correcting chromatic aberration. The optical power of the zoom lens satisfies:

[0054]

[0055]

[0056]

[0057] in, and They respectively represent the optical power of the first lens 101 and the second lens 102 after being glued together, the optical power of the fourth lens 202 and the fifth lens 203 after being glued together, and the optical power of the seventh lens 302 and the eighth lens 303 after being glued together, Indicates the optical power of a zoom lens at the wide-angle end.

[0058] Optionally, the optical power of the first lens 101 to the tenth lens 402 satisfies:

[0059]

[0060]

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069] in, and denote the optical powers of the first lens 101 to the tenth lens 402, respectively, Indicates the optical power of the zoom lens at the wide-angle end. To represent the optical power of the second lens group 20, represents the refractive power of the third lens group 30 .

[0070] Optionally, the refractive index and dispersion coefficient of the first lens 101 to the tenth lens 402 satisfy:

[0071] 1.57≤n1≤1.77;41.8≤v1≤61.8;

[0072] 1.90≤n2≤2.10;20.0≤v2≤39.1;

[0073] 1.60≤n3≤1.80;45.5≤v3≤65.5;

[0074] 1.89≤n4≤2.09;15.5≤v4≤26.5;

[0075] 1.69≤n5≤1.89;37.5≤v5≤57.5;

[0076] 1.40≤n6≤1.60;71.6≤v6≤91.6;

[0077] 1.54≤n7≤1.74;45.4≤v7≤65.5;

[0078] 1.75≤n8≤1.95;22.2≤v8≤42.2;

[0079] 1.40≤n9≤1.80;15.0≤v9≤47.4;

[0080] 1.39≤n10≤1.65;15.2≤v10≤39.5;

[0081] Among them, n1, n2, n3, n4, n5, n6, n7, n8, n9 and n10 respectively denote the refractive indices of the first lens 101 to the tenth lens 402, and v1, v2, v3, v4, v5, v6, v7, v8, v9 and v10 respectively denote the Abbe constants of the first lens 101 to the tenth lens 402.

[0082] Optionally, in order to make the zoom lens have sufficient variable magnification and be able to focus clearly, the displacement G2_L of the second lens group 20 from the wide-angle end to the telephoto end, the displacement G3_L of the third lens group 30 from the wide-angle end to the telephoto end, and the total length TTL_W of the lens at the wide-angle end satisfy:

[0083] 0.08≤G2_L / TTL_W≤0.20;

[0084] 0.26≤G3_L / TTL_W≤0.39.

[0085] Optionally, in order to make the zoom lens have a larger imaging target surface, to ensure that the zoom lens has better imaging quality and a clearer picture, the image plane diameter IC of the zoom lens and the focal length F_W of the zoom lens at the wide-angle end satisfy:

[0086] F_W / IC≤1.50.

[0087] Optionally, in order to ensure that there is enough installation space for the imaging sensor and the filter, the back focus BFL_W of the zoom lens at the wide-angle end and the total length TTL_W of the lens at the wide-angle end satisfy:

[0088] BFL_W / TTL_W≥0.08;

[0089] In order to avoid the zoom lens having an excessively large aperture and to meet the installation space requirements of the final product, the diameter D1 of the first lens and the total length TTL_W of the lens at the wide-angle end satisfy:

[0090] D1 / TTL_W<0.18.

[0091] Optionally, in order to ensure that the zoom lens has high quality while also meeting a high zoom ratio, the focal length of the zoom lens at the wide-angle end and the focal length at the telephoto end satisfy:

[0092]

[0093] For example, Figure 2 for Figure 1 The structural diagram of the telephoto end of the medium zoom lens is shown in Table 1. Figure 1and Figure 2 Specific parameters of the corresponding zoom lens:

[0094] Table 1 Specific parameters of zoom lens

[0095]

[0096]

[0097] Table 2 Figure 1 and Figure 2 The specific design values ​​of the zoom lens parameters are as follows:

[0098] Table 2 Design values ​​of lens parameters of zoom lens

[0099]

[0100]

[0101] Wherein, surface number 1 represents the front surface of the first lens 101 (the surface close to the object side), surface number 2 represents the rear surface of the first lens 101 (the surface close to the image side), and so on, where surface number 2 is the bonding surface of the first lens 101 and the second lens 102; surface number 7 is the bonding surface of the fourth lens 202 and the fifth lens 203; surface number 13 is the bonding surface of the seventh lens 302 and the eighth lens 303; surface numbers 19 and 20 represent the front surface and the rear surface of the lens protection glass, respectively. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface bending toward the image side, a negative value represents the surface bending toward the object side, wherein "infinite" represents the surface is a plane, and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0102] Table 3 shows the zoom interval values ​​in Table 2:

[0103] Table 3 A design value of zoom interval

[0104] Wide-angle end Telephoto end Zoom interval 1 2.508 8.341 Zoom interval 2 14.783 0.499 Zoom interval 3 0.997 9.449

[0105] Table 4 Figure 1 and Figure 2 Aspherical surface parameters of medium zoom lens:

[0106] Table 4 A design value of aspheric coefficient in fixed focus lens

[0107]

[0108]

[0109] Among them, -1.526909E-04 means that the a2 coefficient of face number 9 is -1.526909×10 -4 .

[0110] Figure 3 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment, Figure 4 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment, Figure 5 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment, Figure 6 is a light fan diagram of a zoom lens at the telephoto end in this embodiment, Figure 7 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment, Figure 8 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment, Figure 3 to Figure 8 It can be seen that the zoom lens provided by the embodiment of the present invention has good imaging capability.

[0111] For example, Fig. 9 A schematic diagram of the structure of another zoom lens at the wide-angle end provided by an embodiment of the present invention, Fig.10 for Fig. 9 The structural diagram of the telephoto end of the medium zoom lens is shown in Table 5. Fig. 9 and Fig.10 Specific parameters of the corresponding zoom lens:

[0112] Table 5 Specific parameters of zoom lens

[0113]

[0114]

[0115] Table 6 Fig. 9 and Fig.10 The specific design values ​​of the zoom lens parameters are as follows:

[0116] Table 6 Design values ​​of lens parameters of zoom lens

[0117]

[0118]

[0119] Wherein, surface number 1 represents the front surface of the first lens 101 (the surface close to the object side), surface number 2 represents the rear surface of the first lens 101 (the surface close to the image side), and so on, where surface number 2 is the bonding surface of the first lens 101 and the second lens 102; surface number 7 is the bonding surface of the fourth lens 202 and the fifth lens 203; surface number 13 is the bonding surface of the seventh lens 302 and the eighth lens 303; surface numbers 19 and 20 represent the front surface and the rear surface of the lens protection glass, respectively. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface bending toward the image side, a negative value represents the surface bending toward the object side, wherein "infinite" represents the surface is a plane, and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0120] Table 7 shows the zoom interval values ​​in Table 6:

[0121] Table 7 A design value of zoom interval

[0122] Wide-angle end Telephoto end Zoom interval 1 1.496 8.358 Zoom interval 2 15.940 0.500 Zoom interval 3 0.999 9.578

[0123] Table 8 Fig. 9 and Fig.10 Aspherical surface parameters of medium zoom lens:

[0124] Table 8 A design value of aspheric coefficient in fixed focus lens

[0125] Surface number k <![CDATA[a2]]> <![CDATA[a3]]> <![CDATA[a4]]> <![CDATA[a5]]> 9 0.137 -1.930434E-04 4.188904E-06 -3.444464E-07 9.427894E-09 10 2.985 2.496578E-04 7.929726E-06 -3.947013E-07 1.245348E-08 15 -49.999 -8.503353E-03 4.302062E-05 3.744786E-05 -2.431147E-06 16 2.605 -1.248412E-02 4.510336E-04 -6.391478E-06 -6.165466E-07 17 -50.001 4.324223E-03 -1.173794E-04 1.853402E-06 -3.190149E-08 18 50.000 3.455850E-03 2.323386E-04 -1.872707E-05 5.129120E-07

[0126] Among them, -1.930434E-04 means that the a2 coefficient of face number 9 is -1.930434×10 -4 .

[0127] Fig.11 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment, Fig.12 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment, Fig.13 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment, Fig.14 is a light fan diagram of a zoom lens at the telephoto end in this embodiment, Fig.15 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment, Fig.16 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment, Figures 11 to 16 It can be seen that the zoom lens provided by the embodiment of the present invention has good imaging capability.

[0128] For example, Fig.17A schematic diagram of the structure of another zoom lens at the wide-angle end provided by an embodiment of the present invention, Fig.18 for Fig.17 The structural diagram of the telephoto end of the medium zoom lens is shown in Table 9. Fig.17 and Fig.18 Specific parameters of the corresponding zoom lens:

[0129] Table 9 Specific parameters of zoom lens

[0130]

[0131] Table 10 Fig.17 and Fig.18 The specific design values ​​of the zoom lens parameters are as follows:

[0132] Table 10 Design values ​​of lens parameters of zoom lens

[0133] Surface number Surface type Radius of curvature thickness Materials (n.d.) Material (vd) Semi-diameter 1 Spherical 21.507 3.582 1.67 51.8 7.10 2 Spherical -22.889 0.800 2.00 29.1 6.47 3 Spherical -50.049 Zoom interval 1 6.10 4 Spherical -156.616 0.800 1.70 55.5 4.49 5 Spherical 16.783 1.237 4.12 6 Spherical -13.687 1.035 1.99 16.5 4.07 7 Spherical -10.184 0.799 1.79 47.5 4.08 8 Spherical 1108.130 Zoom interval 2 4.02 9 Aspheric 9.213 1.978 1.50 81.6 3.71 10 Aspheric -13.437 -0.400 3.60 Aperture flat unlimited 0.499 3.48 12 Spherical 8.350 2.376 1.64 55.4 3.45 13 Spherical -28.183 2.729 1.85 32.2 3.10 14 Spherical 5.356 Zoom interval 3 2.44 15 Aspheric 17.172 0.800 1.50 35.2 2.48 16 Aspheric 9.308 0.208 2.73 17 Aspheric 15.317 2.557 1.49 27.3 2.94 18 Aspheric -22.447 2.000 3.08 19 flat unlimited 0.300 1.52 64.2 6.00 20 flat unlimited 6.182 6.00 21 Image plane unlimited 4.84

[0134] Wherein, surface number 1 represents the front surface of the first lens 101 (the surface close to the object side), surface number 2 represents the rear surface of the first lens 101 (the surface close to the image side), and so on, where surface number 2 is the bonding surface of the first lens 101 and the second lens 102; surface number 7 is the bonding surface of the fourth lens 202 and the fifth lens 203; surface number 13 is the bonding surface of the seventh lens 302 and the eighth lens 303; surface numbers 19 and 20 represent the front surface and the rear surface of the lens protection glass, respectively. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface bending toward the image side, a negative value represents the surface bending toward the object side, wherein "infinite" represents the surface is a plane, and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0135] Table 11 shows the zoom interval values ​​in Table 10:

[0136] Table 11 A design value of zoom interval

[0137] Wide-angle end Telephoto end Zoom interval 1 1.495 8.248 Zoom interval 2 16.025 0.499 Zoom interval 3 0.999 9.772

[0138] Table 12 Fig.17 and Fig.18 Aspherical surface parameters of medium zoom lens:

[0139] Table 12 A design value of aspheric coefficient in fixed focus lens

[0140] Surface number k <![CDATA[a2]]> <![CDATA[a3]]> <![CDATA[a4]]> <![CDATA[a5]]> 9 0.184 -2.441828E-04 8.332616E-06 -7.715869E-07 2.751844E-08 10 7.355 4.544994E-04 2.862298E-05 -1.550907E-06 8.725986E-08 15 -46.860 -8.508773E-03 1.157480E-04 3.521591E-05 -2.258188E-06 16 3.714 -1.073478E-02 3.711567E-04 -3.740246E-07 -7.530936E-07 17 -50.003 4.828976E-03 -1.924650E-04 5.530569E-06 -9.932085E-08 18 29.189 3.242376E-03 1.902449E-04 -1.598385E-05 4.941582E-07

[0141] Among them, -2.441828E-04 means that the a2 coefficient of face number 9 is -2.441828×10 -4 .

[0142] Fig.19 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment, Fig. 20 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment, Fig.21 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment, Fig. 22 is a light fan diagram of a zoom lens at the telephoto end in this embodiment, Fig.23 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment, Fig.24 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment, Figure 19 to Figure 24 It can be seen that the zoom lens provided by the embodiment of the present invention has good imaging capability.

[0143] For example, Fig.25 A schematic diagram of the structure of another zoom lens at the wide-angle end provided by an embodiment of the present invention, Fig.26 for Fig.25 The structural diagram of the telephoto end of the medium zoom lens is shown in Table 13. Fig.25 and Fig.26 Specific parameters of the corresponding zoom lens:

[0144] Table 13 Specific parameters of zoom lens

[0145]

[0146]

[0147] Table 14 is Fig.25 and Fig.26 The specific design values ​​of the zoom lens parameters are as follows:

[0148] Table 14 Design values ​​of lens parameters of zoom lens

[0149]

[0150]

[0151] Wherein, surface number 1 represents the front surface of the first lens 101 (the surface close to the object side), surface number 2 represents the rear surface of the first lens 101 (the surface close to the image side), and so on, where surface number 2 is the bonding surface of the first lens 101 and the second lens 102; surface number 7 is the bonding surface of the fourth lens 202 and the fifth lens 203; surface number 13 is the bonding surface of the seventh lens 302 and the eighth lens 303; surface numbers 19 and 20 represent the front surface and the rear surface of the lens protection glass, respectively. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents the surface bending toward the image side, a negative value represents the surface bending toward the object side, wherein "infinite" represents the surface is a plane, and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0152] Table 15 shows the zoom interval values ​​in Table 14:

[0153] Table 15 A design value of zoom interval

[0154] Wide-angle end Telephoto end Zoom interval 1 1.499 7.543 Zoom interval 2 15.534 0.499 Zoom interval 3 0.999 9.990

[0155] Table 16 Fig.25 and Fig.26 Aspherical surface parameters of medium zoom lens:

[0156] Table 16 A design value of aspheric coefficient in fixed focus lens

[0157]

[0158]

[0159] Among them, -1.656732E-04 means that the a2 coefficient of face number 9 is -1.656732×10 -4 .

[0160] Fig. 27 is a spherical aberration curve diagram of a zoom lens at the wide-angle end in this embodiment, Fig.28 is a spherical aberration curve diagram of a zoom lens at the telephoto end in this embodiment, Fig.29 is a light fan diagram of a zoom lens at the wide-angle end in this embodiment, Fig.30 is a light fan diagram of a zoom lens at the telephoto end in this embodiment, Fig.31 is a field curvature distortion diagram of a zoom lens at the wide-angle end in this embodiment, Fig.32 is a field curvature distortion diagram of a zoom lens at the telephoto end in this embodiment, Figure 27 to Figure 32 It can be seen that the zoom lens provided by the embodiment of the present invention has good imaging capability.

[0161] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A zoom lens, characterized in that: The zoom lens comprises a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power and a fourth lens group with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis, wherein the second lens group and the third lens group reciprocate along the optical axis during zooming, so as to achieve continuous zooming of the total effective focal length of the zoom lens within a range of 10 mm to 45 mm; The first lens group includes a first lens and a second lens, the second lens group includes a third lens, a fourth lens and a fifth lens, the third lens group includes a sixth lens, a seventh lens and an eighth lens, and the fourth lens group includes a ninth lens and a tenth lens; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the sixth lens has positive focal power, the seventh lens has positive focal power, the eighth lens has negative focal power, the ninth lens has positive focal power or negative focal power, and the tenth lens has positive focal power; Also included is an aperture stop, which is located between the sixth lens and the seventh lens.

2. The zoom lens according to claim 1, wherein: The first lens is a biconvex spherical lens, the second lens is a concave-convex spherical lens, the third lens is a convex-concave spherical lens, the fourth lens is a concave-convex spherical lens, the fifth lens is a biconcave spherical lens, the sixth lens is a biconvex aspheric lens, the seventh lens is a biconvex spherical lens, the eighth lens is a biconcave spherical lens, the ninth lens is a concave-convex or convex-concave aspheric lens, and the tenth lens is a convex-concave aspheric lens.

3. The zoom lens according to claim 1, wherein: The first lens and the second lens form a cemented lens, the fourth lens and the fifth lens form a cemented lens, the seventh lens and the eighth lens form a cemented lens, and the optical power of the zoom lens satisfies: in, and represent respectively the optical power of the first lens and the second lens after being glued together, the optical power of the fourth lens and the fifth lens after being glued together, and the optical power of the seventh lens and the eighth lens after being glued together, Indicates the optical power of the zoom lens at the wide-angle end.

4. The zoom lens according to claim 1, wherein: The optical power of the first lens to the tenth lens satisfies: in, and represent the optical powers of the first lens to the tenth lens respectively, represents the optical power of the zoom lens at the wide-angle end, represents the optical power of the second lens group, represents the optical power of the third lens group.

5. The zoom lens according to claim 1, wherein: The refractive index and the dispersion coefficient of the first lens to the tenth lens satisfy: 1.57≤n1≤1.77;41.8≤v1≤61.8; 1.90≤n2≤2.10;20.0≤v2≤39.1; 1.60≤n3≤1.80;45.5≤v3≤65.5; 1.89≤n4≤2.09;15.5≤v4≤26.5; 1.69≤n5≤1.89;37.5≤v5≤57.5; 1.40≤n6≤1.60;71.6≤v6≤91.6; 1.54≤n7≤1.74;45.4≤v7≤65.5; 1.75≤n8≤1.95;22.2≤v8≤42.2; 1.40≤n9≤1.80;15.0≤v9≤47.4; 1.39≤n10≤1.65;15.2≤v10≤39.5; Among them, n1, n2, n3, n4, n5, n6, n7, n8, n9 and n10 respectively represent the refractive indices of the first lens to the tenth lens, and v1, v2, v3, v4, v5, v6, v7, v8, v9 and v10 respectively represent the Abbe constants of the first lens to the tenth lens.

6. The zoom lens according to claim 1, wherein: The displacement G2_L of the second lens group from the wide-angle end to the telephoto end, the displacement G3_L of the third lens group from the wide-angle end to the telephoto end, and the total lens length TTL_W at the wide-angle end satisfy: 0.08≤G2_L / TTL_W≤0.20; 0.26≤G3_L / TTL_W≤0.

39.

7. The zoom lens according to claim 1, wherein: The image diameter IC of the zoom lens and the focal length F_W of the zoom lens at the wide-angle end satisfy: F_W / IC≤1.

50.

8. The zoom lens according to claim 1, wherein: The back focus BFL_W of the zoom lens at the wide-angle end and the total length TTL_W of the lens at the wide-angle end satisfy: BFL_W / TTL_W≥0.08; The diameter D1 of the first lens and the total length TTL_W of the lens at the wide-angle end satisfy: D1 / TTL_W<0.

18.

9. The zoom lens according to claim 1, wherein: The focal length of the zoom lens at the wide angle end and the focal length at the telephoto end satisfy:

Images