Zoom lens

Abstract

The application discloses a zoom lens, which comprises front fixed lens group, zoom lens group, rear fixed lens group and focusing lens group arranged in sequence along the optical axis from the object side to the image side, the front fixed lens group comprises a first lens, a second lens and a third lens; the zoom lens group comprises a fourth lens, a fifth lens and a sixth lens; the rear fixed lens group comprises a seventh lens, an eighth lens, a ninth lens and a tenth lens; the focusing lens group comprises an eleventh lens, a twelfth lens and a thirteenth lens. The zoom lens provided by the application only adopts 13 lenses, reduces the length of the lens, and reduces the cost and weight. Meanwhile, by reasonably matching the lens groups and the optical power of each lens in the lens groups, the aberration balance of each focal length is effectively realized, the image is clear under different focal length states, and thus higher image quality is realized within a short overall length limit.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the technical field of optical devices, in particular to a zoom lens. BACKGROUND

[0002] The zoom all-in-one machine is applied more and more widely in various aspects such as face recognition, fire prevention and control, traffic control, smart campus and smart hospital.

[0003] The all-in-one machine of full glass is the mainstream in the market at present, but such products usually have problems of high cost and large weight. SUMMARY

[0004] The application provides a zoom lens to realize higher image quality within a shorter total length limit and reduce cost and weight.

[0005] The embodiment of the application provides a zoom lens, which comprises, in sequence along an optical axis from an object side to an image side, a front fixed lens group, a variable magnification lens group, a rear fixed lens group and a focusing lens group; the front fixed lens group and the rear fixed lens group are fixedly arranged, and the variable magnification lens group and the focusing lens group are arranged to be movable along the optical axis direction.

[0006] The front fixed lens group comprises, in sequence along the optical axis from the object side to the image side, a first lens, a second lens and a third lens.

[0007] The variable magnification lens group comprises, in sequence along the optical axis from the object side to the image side, a fourth lens, a fifth lens and a sixth lens.

[0008] The rear fixed lens group comprises, in sequence along the optical axis from the object side to the image side, a seventh lens, an eighth lens, a ninth lens and a tenth lens.

[0009] The focusing lens group comprises, in sequence along the optical axis from the object side to the image side, an eleventh lens, a twelfth lens and a thirteenth lens.

[0010] The first lens has negative refractive power, the second lens has positive refractive power, and the third lens has positive refractive power; the fourth lens has negative refractive power, the fifth lens has negative refractive power, and the sixth lens has positive refractive power; the seventh lens has positive refractive power, the ninth lens has positive refractive power, and the tenth lens has negative refractive power; and the eleventh lens has positive refractive power.

[0011] The focal power of the zoom lens at the wide-angle end is W_F, the focal power of the zoom lens at the telephoto end is T_F; the focal power of the front fixed lens group is G1_F, the focal power of the variable magnification lens group is G2_F, the focal power of the rear fixed lens group is G3_F, and the focal power of the focusing lens group is G4_F; the focal power of the first lens is L1_F, the focal power of the second lens is L2_F, the focal power of the third lens is L3_F, the focal power of the fourth lens is L4_F, the focal power of the fifth lens is L5_F, the focal power of the sixth lens is L6_F, the focal power of the seventh lens is L7_F, the focal power of the eighth lens is L8_F, the focal power of the ninth lens is L9_F, the focal power of the tenth lens is L10_F, the focal power of the eleventh lens is L11_F, the focal power of the twelfth lens is L12_F, and the focal power of the thirteenth lens is L13_F; wherein:

[0012] 0.35≤L3_F / G1_F≤0.45, -0.65≤L1_F / L2_F≤-0.5;

[0013] 0.29≤G1_F / W_F≤0.36, 0.7≤L4_F / G2_F≤0.9, 0.52≤L5_F / G2_F≤0.62, -1.7≤L5_F / L6_F≤-1.1, -1.15≤G2_F / W_F≤-0.9;

[0014] 0.7≤L7_F / G3_F≤1.1, 0≤L8_F / G3_F≤0.2, 0.6≤L9_F / G3_F≤0.9, -0.5≤L9_F / L10_F≤-0.4, 0.45≤G3_F / W_F≤0.75;

[0015] 0.8≤L11_F / G4_F≤1.5, -0.4≤L12_F / G4_F≤0.05;

[0016] -0.6≤L13_F / G4_F≤0.6, 0.4≤G4_F / W_F≤0.65, W_F / T_F≥0.35.

[0017] Optionally, the first lens and the second lens form a first cemented lens group;

[0018] The ninth lens and the tenth lens form a second cemented lens group.

[0019] Optionally, the focal power of the first cemented lens group is U1_F, and the focal power of the front fixed lens group is G1_F;

[0020] 0.58≤U1_F / G1_F≤0.65.

[0021] Optionally, a curvature of the object side surface of the third lens is L3_c1, a curvature of the image side surface of the third lens is L3_c2, and a shape factor of the third lens is X3, X3=(L3_c1-L3_c2) / (L3_c1+L3_c2);

[0022] wherein 0.4≤X3≤0.7.

[0023] Optionally, a curvature of the object side surface of the sixth lens is L6_c1, a curvature of the image side surface of the sixth lens is L6_c2, and a shape factor of the sixth lens is X6, X6=(L6_c1-L6_c2) / (L6_c1+L6_c2);

[0024] wherein 0.8≤X6≤1.6.

[0025] Optionally, a curvature of the object side surface of the ninth lens is L9_c1, a curvature of the image side surface of the ninth lens is L9_c2, and a shape factor of the ninth lens is X9, X9=(L9_c1-L9_c2) / (L9_c1+L9_c2);

[0026] wherein 0.4≤X9≤0.7.

[0027] Optionally, a curvature of the object side surface of the eleventh lens is L11_c1, a curvature of the image side surface of the eleventh lens is L11_c2, and a shape factor of the eleventh lens is X11, X11=(L11_c1-L11_c2) / (L11_c1+L11_c2); a curvature of the object side surface of the twelfth lens is L12_c1, a curvature of the image side surface of the twelfth lens is L12_c2, and a shape factor of the twelfth lens is X12, X12=(L12_c1-L12_c2) / (L12_c1+L12_c2);

[0028] wherein 0.2≤X11≤3, -0.2≤X12≤0.2.

[0029] Optionally, a distance that the variable magnification lens group moves along the optical axis direction from the wide-angle end to the telephoto end is G2_L, and an overall length of the zoom lens is TTL;

[0030] wherein 0.19≤G2_L / TTL≤0.24.

[0031] Optionally, the first lens, the second lens, the third lens, the fourth lens, the seventh lens, the ninth lens, the tenth lens, and the eleventh lens are glass spherical lenses.

[0032] The fifth lens, the sixth lens, the eighth lens, the twelfth lens and the thirteenth lens are plastic aspheric lenses.

[0033] Optionally, the zoom lens further comprises a diaphragm.

[0034] The diaphragm is located in the optical path between the variable magnification lens group and the rear fixed lens group.

[0035] The zoom lens provided by the embodiment of the present application comprises a front fixed lens group, a variable magnification lens group, a rear fixed lens group and a focusing lens group arranged in sequence along the optical axis from the object side to the image side, and specifically adopts 13 lenses, so that the number of lenses is small, thereby helping to reduce the length of the lens. Through reasonable matching of the lens groups and the optical power of the lenses in the lens groups, the aberration balance of the focal lengths can be effectively realized, the image clarity under different focal lengths is ensured, thereby realizing high image quality within a short overall length limit, and reducing the cost and weight. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A structure schematic view of the zoom lens provided by the embodiment one of the present application at the wide-angle end;

[0037] Figure 2 A structure schematic view of the zoom lens provided by the embodiment one of the present application at the long-focus end;

[0038] Figure 3 A spherical aberration graph of the zoom lens provided by the embodiment one of the present application at the wide-angle end;

[0039] Figure 4 A field curvature graph of the zoom lens provided by the embodiment one of the present application at the wide-angle end;

[0040] Figure 5 A distortion graph of the zoom lens provided by the embodiment one of the present application at the wide-angle end;

[0041] Figure 6 A spherical aberration graph of the zoom lens provided by the embodiment one of the present application at the sub-wide-angle end;

[0042] Figure 7 A field curvature graph of the zoom lens provided by the embodiment one of the present application at the sub-wide-angle end;

[0043] Figure 8 A distortion graph of the zoom lens provided by the embodiment one of the present application at the sub-wide-angle end;

[0044] Figure 9 A spherical aberration graph of the zoom lens provided by the embodiment one of the present application at the sub-long-focus end;

[0045] Figure 10 A field curvature graph of the zoom lens provided by the embodiment one of the present application at the sub-long-focus end;

[0046] Figure 11 The distortion chart of the zoom lens provided for the first embodiment of the present application at the long focus end;

[0047] Figure 12 The spherical aberration chart of the zoom lens provided for the first embodiment of the present application at the long focus end;

[0048] Figure 13 The field curvature chart of the zoom lens provided for the first embodiment of the present application at the long focus end;

[0049] Figure 14 The distortion chart of the zoom lens provided for the first embodiment of the present application at the long focus end;

[0050] Figure 15 The structural schematic view of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0051] Figure 16 The structural schematic view of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0052] Figure 17 The spherical aberration chart of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0053] Figure 18 The field curvature chart of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0054] Figure 19 The distortion chart of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0055] Figure 20 The spherical aberration chart of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0056] Figure 21 The field curvature chart of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0057] Figure 22 The distortion chart of the zoom lens provided for the second embodiment of the present application at the wide angle end;

[0058] Figure 23 The spherical aberration chart of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0059] Figure 24 The field curvature chart of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0060] Figure 25 The distortion chart of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0061] Figure 26The spherical aberration graph of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0062] Figure 27 The field curvature graph of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0063] Figure 28 The distortion graph of the zoom lens provided for the second embodiment of the present application at the long focus end;

[0064] Figure 29 The structural schematic diagram of the zoom lens provided for the third embodiment of the present application at the wide angle end;

[0065] Figure 30 The structural schematic diagram of the zoom lens provided for the third embodiment of the present application at the long focus end;

[0066] Figure 31 The spherical aberration graph of the zoom lens provided for the third embodiment of the present application at the wide angle end;

[0067] Figure 32 The field curvature graph of the zoom lens provided for the third embodiment of the present application at the wide angle end;

[0068] Figure 33 The distortion graph of the zoom lens provided for the third embodiment of the present application at the wide angle end;

[0069] Figure 34 The spherical aberration graph of the zoom lens provided for the third embodiment of the present application at the sub wide angle end;

[0070] Figure 35 The field curvature graph of the zoom lens provided for the third embodiment of the present application at the sub wide angle end;

[0071] Figure 36 The distortion graph of the zoom lens provided for the third embodiment of the present application at the sub wide angle end;

[0072] Figure 37 The spherical aberration graph of the zoom lens provided for the third embodiment of the present application at the sub long focus end;

[0073] Figure 38 The field curvature graph of the zoom lens provided for the third embodiment of the present application at the sub long focus end;

[0074] Figure 39 The distortion graph of the zoom lens provided for the third embodiment of the present application at the sub long focus end;

[0075] Figure 40 The spherical aberration graph of the zoom lens provided for the third embodiment of the present application at the long focus end;

[0076] Figure 41 The field curvature graph of the zoom lens provided for the third embodiment of the present application at the long focus end;

[0077] Figure 42 The distortion diagram of the zoom lens provided for the third embodiment of the present application at the long focus end;

[0078] Figure 43 The structure diagram of the zoom lens provided for the fourth embodiment of the present application at the wide angle end;

[0079] Figure 44 The structure diagram of the zoom lens provided for the fourth embodiment of the present application at the long focus end;

[0080] Figure 45 The spherical aberration diagram of the zoom lens provided for the fourth embodiment of the present application at the wide angle end;

[0081] Figure 46 The field curvature diagram of the zoom lens provided for the fourth embodiment of the present application at the wide angle end;

[0082] Figure 47 The distortion diagram of the zoom lens provided for the fourth embodiment of the present application at the wide angle end;

[0083] Figure 48 The spherical aberration diagram of the zoom lens provided for the fourth embodiment of the present application at the sub wide angle end;

[0084] Figure 49 The field curvature diagram of the zoom lens provided for the fourth embodiment of the present application at the sub wide angle end;

[0085] Figure 50 The distortion diagram of the zoom lens provided for the fourth embodiment of the present application at the sub wide angle end;

[0086] Figure 51 The spherical aberration diagram of the zoom lens provided for the fourth embodiment of the present application at the sub long focus end;

[0087] Figure 52 The field curvature diagram of the zoom lens provided for the fourth embodiment of the present application at the sub long focus end;

[0088] Figure 53 The distortion diagram of the zoom lens provided for the fourth embodiment of the present application at the sub long focus end;

[0089] Figure 54 The spherical aberration diagram of the zoom lens provided for the fourth embodiment of the present application at the long focus end;

[0090] Figure 55 The field curvature diagram of the zoom lens provided for the fourth embodiment of the present application at the long focus end;

[0091] Figure 56 The distortion diagram of the zoom lens provided for the fourth embodiment of the present application at the long focus end. DETAILED DESCRIPTION

[0092] The application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the application and are not limiting of the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for the purpose of description.

[0093] Embodiment one

[0094] Figure 1 The structural schematic diagram of the zoom lens provided by the embodiment one of the application at the wide-angle end is shown in Figure 2 The structural schematic diagram of the zoom lens provided by the embodiment one of the application at the long-focus end is shown in Figure 1 and Figure 2 As shown in the drawings, the zoom lens provided by the embodiment of the application comprises, in order along the optical axis from the object side to the image side, a front fixed lens group 11, a variable magnification lens group 12, a rear fixed lens group 13 and a focusing lens group 14. The front fixed lens group 11 and the rear fixed lens group 13 are fixedly arranged, and the variable magnification lens group 12 and the focusing lens group 14 are movably arranged along the optical axis.

[0095] The front fixed lens group 11 comprises, in order along the optical axis from the object side to the image side, a first lens 111, a second lens 112 and a third lens 113. The variable magnification lens group 12 comprises, in order along the optical axis from the object side to the image side, a fourth lens 121, a fifth lens 122 and a sixth lens 123. The rear fixed lens group 13 comprises, in order along the optical axis from the object side to the image side, a seventh lens 131, an eighth lens 132, a ninth lens 133 and a tenth lens 134. The focusing lens group 14 comprises, in order along the optical axis from the object side to the image side, an eleventh lens 141, a twelfth lens 142 and a thirteenth lens 143.

[0096] The first lens 111 has a negative refractive power, the second lens 112 has a positive refractive power, and the third lens 113 has a positive refractive power. The fourth lens 121 has a negative refractive power, the fifth lens 122 has a negative refractive power, and the sixth lens 123 has a positive refractive power. The seventh lens 131 has a positive refractive power, the ninth lens 133 has a positive refractive power, and the tenth lens 134 has a negative refractive power. The eleventh lens 141 has a positive refractive power.

[0097] The focal power of the zoom lens at the wide-angle end is W_F, the focal power of the zoom lens at the telephoto end is T_F; the focal power of the front fixed lens group 11 is G1_F, the focal power of the variable power lens group 12 is G2_F, the focal power of the rear fixed lens group 13 is G3_F, and the focal power of the focusing lens group 14 is G4_F; the focal power of the first lens 111 is L1_F, the focal power of the second lens 112 is L2_F, the focal power of the third lens 113 is L3_F, the focal power of the fourth lens 121 is L4_F, the focal power of the fifth lens 122 is L5_F, the focal power of the sixth lens 123 is L6_F, the focal power of the seventh lens 131 is L7_F, the focal power of the eighth lens 132 is L8_F, the focal power of the ninth lens 133 is L9_F, the focal power of the tenth lens 134 is L10_F, the focal power of the eleventh lens 141 is L11_F, the focal power of the twelfth lens 142 is L12_F, and the focal power of the thirteenth lens 143 is L13_F; wherein:

[0098] 0.35≤L3_F / G1_F≤0.45, -0.65≤L1_F / L2_F≤-0.5;

[0099] 0.29≤G1_F / W_F≤0.36, 0.7≤L4_F / G2_F≤0.9, 0.52≤L5_F / G2_F≤0.62, -1.7≤L5_F / L6_F≤-1.1, -1.15≤G2_F / W_F≤-0.9;

[0100] 0.7≤L7_F / G3_F≤1.1, 0≤L8_F / G3_F≤0.2, 0.6≤L9_F / G3_F≤0.9, -0.5≤L9_F / L10_F≤-0.4, 0.45≤G3_F / W_F≤0.75;

[0101] 0.8≤L11_F / G4_F≤1.5, -0.4≤L12_F / G4_F≤0.05;

[0102] -0.6≤L13_F / G4_F≤0.6, 0.4≤G4_F / W_F≤0.65, W_F / T_F≥0.35.

[0103] In the zoom lens provided in the embodiment, the front fixed lens group 11, the variable power lens group 12, the rear fixed lens group 13, and the focusing lens group 14 can be arranged in one lens barrel (1) of the zoom lens. Figure 1 and Figure 2The front fixed lens group 11 and the rear fixed lens group 13 are fixed in the lens barrel, and the front fixed lens group 11 and the rear fixed lens group 13 are not moved relative to the image plane. The zoom lens group 12 and the focusing lens group 14 can be moved along the optical axis in the lens barrel, and the movement of the focusing lens group 14 can realize the focusing function, and the movement of the zoom lens group 12 can realize the zooming function, and the combined movement of the zoom lens group 12 and the focusing lens group 14 can realize the continuous change of the focal length of the zoom lens from wide angle to long focus.

[0104] It can be understood that, in the process of zooming of the zoom lens by moving the zoom lens group 12 and the focusing lens group 14, the shortest focal length is the wide angle end, and the longest focal length is the long focus end, and the zoom lens has different focal lengths and optical powers at the wide angle end and the long focus end, and also has different lengths or shapes.

[0105] Further, the optical power is equal to the difference between the converging degree of the image side light beam and the converging degree of the object side light beam, and its value is the reciprocal of the focal length, which represents the ability of the optical system to bend light. The greater the absolute value of the optical power, the stronger the bending ability of the light, and the smaller the absolute value of the optical power, the weaker the bending ability of the light. When the optical power is positive, the refraction of the light is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power can be used to represent a certain refractive surface of a lens (i.e. a surface of a lens), a certain lens, or a system (i.e. a lens group) formed by multiple lenses.

[0106] In the embodiment, by arranging the front fixed lens group 11 to include the first lens 111, the second lens 112 and the third lens 113 arranged in sequence along the optical axis from the object side to the image side, the zoom lens group 12 to include the fourth lens 121, the fifth lens 122 and the sixth lens 123 arranged in sequence along the optical axis from the object side to the image side, the rear fixed lens group 13 to include the seventh lens 131, the eighth lens 132, the ninth lens 133 and the tenth lens 134 arranged in sequence along the optical axis from the object side to the image side, the focusing lens group 14 to include the eleventh lens 141, the twelfth lens 142 and the thirteenth lens 143 arranged in sequence along the optical axis from the object side to the image side, and reasonably distributing the optical powers of the front fixed lens group 11, the zoom lens group 12, the rear fixed lens group 13, the focusing lens group 14 and each lens, the optical powers of each lens group and each lens are matched with each other to compensate for the aberration caused by the zooming movement of the zoom lens group 12 and the focusing lens group 14 and the zoom lens group 12, so that the aberration balance of each focal length range can be effectively realized, and the image clarity under different focal lengths can be ensured.

[0107] Meanwhile, the zoom lens provided by the embodiment of the present application only uses 13 lenses, and the number of lenses is small, thereby helping to reduce the length of the lens, realizing high image quality within a short overall length limit, and reducing the cost and weight.

[0108] It should be noted that the optical power and the refractive index of the present application are determined for the wavelength of 587.56 nm. The lenses can be indirectly supported by the Mylar sheet or the spacer ring.

[0109] In summary, the zoom lens provided by the embodiment of the present application includes the front fixed lens group 11, the variable magnification lens group 12, the rear fixed lens group 13 and the focusing lens group 14 arranged in sequence along the optical axis from the object side to the image side, and specifically uses 13 lenses, and the number of lenses is small, thereby helping to reduce the length of the lens. By reasonably matching the optical power of each lens group and each lens therein, the aberration balance of each focal length can be effectively realized, the image clarity under different focal lengths is ensured, thereby realizing high image quality within a short overall length limit, and reducing the cost and weight.

[0110] As a feasible implementation manner, as shown in Figure 1 and Figure 2 , the first lens 111 and the second lens 112 form the first cemented lens group 21, and the ninth lens 133 and the tenth lens 134 form the second cemented lens group 22.

[0111] The first lens 111 and the second lens 112 form the first cemented lens group 21, and the ninth lens 133 and the tenth lens 134 form the second cemented lens group 22, which can effectively reduce the air gap between the first lens 111 and the second lens 112 and between the ninth lens 133 and the tenth lens 134, thereby further reducing the total length of the lens. In addition, the first cemented lens group 21 and the second cemented lens group 22 can maximize the reduction or elimination of chromatic aberration, so that various aberrations of the zoom lens can be fully corrected, the resolution can be improved, the optical performance such as distortion can be optimized, the light loss caused by the reflection between the lenses can be reduced, the illumination can be improved, thereby improving the image quality and the clarity of the lens imaging. In addition, the use of the first cemented lens group 21 and the second cemented lens group 22 can also reduce the assembly components between the lenses, simplify the assembly process during the manufacture of the lens, reduce the cost, and reduce the tolerance sensitivity problems such as tilt and eccentricity of the lens unit caused in the assembly process.

[0112] As a feasible implementation manner, the optical power of the first cemented lens group 21 is U1_F, and the optical power of the front fixed lens group 11 is G1_F, wherein 0.58≤U1_F / G1_F≤0.65.

[0113] Wherein, by setting the power relationship of the first cemented lens group 21 and the front fixed lens group 11 reasonably, the aberration caused by the zooming movement of the zoom lens group 12 and the focusing lens group 14 and the zoom lens group 12 can be compensated, the aberration balance of each focal length is effectively realized, and the image clarity under different focal length states is ensured.

[0114] As a feasible implementation, the curvature of the object side surface of the third lens 113 is L3_c1, the curvature of the image side surface of the third lens 113 is L3_c2, and the shape factor of the third lens 113 is X3, X3=(L3_c1-L3_c2) / (L3_c1+L3_c2), wherein 0.4≤X3≤0.7.

[0115] Wherein, by setting the shape factor X3 of the third lens 113 reasonably, the spherical aberration and coma of the front fixed lens group 11 can be effectively corrected, thereby improving the image quality and enhancing the clarity of lens imaging.

[0116] As a feasible implementation, the curvature of the object side surface of the sixth lens 123 is L6_c1, the curvature of the image side surface of the sixth lens 123 is L6_c2, and the shape factor of the sixth lens 123 is X6, X6=(L6_c1-L6_c2) / (L6_c1+L6_c2), wherein 0.8≤X6≤1.6.

[0117] Wherein, by setting the shape factor X6 of the sixth lens 123 reasonably, the chromatic aberration of the zoom lens group 12 can be effectively corrected, thereby improving the image quality and enhancing the clarity of lens imaging.

[0118] As a feasible implementation, the curvature of the object side surface of the ninth lens 133 is L9_c1, the curvature of the image side surface of the ninth lens 133 is L9_c2, and the shape factor of the ninth lens 133 is X9, X9=(L9_c1-L9_c2) / (L9_c1+L9_c2), wherein 0.4≤X9≤0.7.

[0119] Wherein, by setting the shape factor X9 of the ninth lens 133 reasonably, the chromatic aberration of the rear fixed lens group 13 can be effectively corrected, thereby improving the image quality and enhancing the clarity of lens imaging.

[0120] As a feasible implementation, a curvature of an object side surface of the eleventh lens 141 is L11_c1, a curvature of an image side surface of the eleventh lens 141 is L11_c2, a shape factor of the eleventh lens 141 is X11, X11=(L11_c1-L11_c2) / (L11_c1+L11_c2); a curvature of an object side surface of the twelfth lens 142 is L12_c1, a curvature of an image side surface of the twelfth lens 142 is L12_c2, a shape factor of the twelfth lens 142 is X12, X12=(L12_c1-L12_c2) / (L12_c1+L12_c2); wherein, 0.2≤X11≤3, -0.2≤X12≤0.2.

[0121] By reasonably setting the shape factor X11 of the eleventh lens 141 and the shape factor X12 of the twelfth lens 142, the residual field curvature and astigmatism of the zoom lens can be effectively corrected, the tolerance sensitivity is reduced, the image quality is improved, the clarity of lens imaging is improved, and the production possibility is improved.

[0122] As a feasible implementation, a distance that the power zoom lens group 12 moves along the optical axis direction from the wide-angle end to the long-focus end is G2_L, and an optical total length of the zoom lens is TTL, wherein, 0.19≤G2_L / TTL≤0.24.

[0123] The distance from the optical axis center of the object side surface of the first lens 111 to the image surface is the optical total length TTL of the zoom lens, and in the embodiment, by reasonably setting the moving range of the power zoom lens group 12, the total length of the lens can be effectively controlled, so that the product installation space limit is not exceeded, which is beneficial to the later assembly.

[0124] As a feasible implementation, the first lens 111, the second lens 112, the third lens 113, the fourth lens 121, the seventh lens 131, the ninth lens 133, the tenth lens 134 and the eleventh lens 141 are glass spherical lenses, and the fifth lens 122, the sixth lens 123, the eighth lens 132, the twelfth lens 142 and the thirteenth lens 143 are plastic aspherical lenses.

[0125] By setting the fifth lens 122, the sixth lens 123, the eighth lens 132, the twelfth lens 142 and the thirteenth lens 143 as aspherical lenses, high-order aberrations can be effectively corrected.

[0126] At the same time, since the cost of the lens made of plastic material is much lower than that of the lens made of glass material, the use of plastic aspherical lenses in the above lens can also reduce the cost of the zoom lens,

[0127] Further, the light turning ability of the glass lens is strong, and by setting the first lens 111, the second lens 112, the third lens 113, the fourth lens 121, the seventh lens 131, the ninth lens 133, the tenth lens 134 and the eleventh lens 141 as glass spherical lenses, the number of lenses can be reduced, thereby reducing the size of the lens.

[0128] Meanwhile, the glass and the plastic can compensate each other, balance the high and low temperatures, and make the zoom lens have the characteristics of stable high and low temperature performance, thereby improving the environmental adaptability of the zoom lens.

[0129] The material of the plastic aspherical lens can be various plastics known by those skilled in the art, and the material of the glass spherical lens can be various types of glass known by those skilled in the art, and the embodiments of the present application do not make superfluous repetition and are not limited.

[0130] As a feasible implementation manner, as shown in Figure 1 and Figure 2 The zoom lens further comprises a diaphragm 15 located in the light path between the variable lens group 12 and the rear fixed lens group 13.

[0131] The diaphragm 15 can be located in the light path between the variable lens group 12 and the rear fixed lens group 13, but the specific setting position of the diaphragm 15 is not limited in the embodiments of the present application.

[0132] As a feasible implementation manner, as shown in Figure 1 and Figure 2 The object side of the first lens 111 is a convex surface, the image side of the first lens 111 is a concave surface; the object side of the second lens 112 is a convex surface, the image side of the second lens 112 is a convex surface; the object side of the sixth lens 123 is a convex surface, the image side of the sixth lens 123 is a convex surface; the object side of the ninth lens 133 is a convex surface, the image side of the ninth lens 133 is a concave surface; the object side of the tenth lens 134 is a convex surface, the image side of the tenth lens 134 is a concave surface; the object side of the fourth lens 121 is a concave surface, the image side of the fourth lens 121 is a concave surface; or, the object side of the fourth lens 121 is a convex surface, the image side of the fourth lens 121 is a concave surface.

[0133] The surface adjacent to the object side of the lens is the object side, and the surface adjacent to the image side of the lens is the image side.

[0134] In the embodiments, by reasonably setting the surface types of the lenses, the light power requirement in the above embodiments can be met, and the compact structure and high integration of the entire zoom lens can be ensured.

[0135] As a feasible implementation, as shown in Figure 1 and Figure 2 The zoom lens further comprises a flat glass 16 arranged on the image side of the thirteenth lens 143.

[0136] The flat glass 16 with a certain thickness is arranged between the thirteenth lens 143 and the image plane, which not only plays a protective role, but also filters out unwanted stray light, thereby improving the imaging quality of the zoom lens, for example, filtering out infrared light in the daytime through the flat glass 16 to improve the imaging quality of the zoom lens.

[0137] In summary, the zoom lens provided by the embodiment of the present application uses eight glass lenses and five plastic lenses, and through reasonable matching of the focal power ratio, selection of appropriate materials, the zoom lens can better correct aberration, realize higher image quality and larger aperture within a shorter overall length limit, and realize a high-performance zoom lens with an angle of view from about 25 degrees to 8 degrees on a 1 / 1.8 inch CMOS target surface.

[0138] For example, Table 1 details the specific optical and physical parameters of each lens in the zoom lens provided by the first embodiment of the present application in a feasible implementation, and the zoom lens in Table 1 corresponds to the zoom lens shown in Figure 1 and Figure 2 .

[0139] Table 1: Design values of optical and physical parameters of the zoom lens

[0140] Surface No. Surface Type R T nd vd Half Radius k 1 Spherical 23.1957 0.95 1.8466 23.7896 9.9816 2 Spherical 17.7832 3.6403 1.4969 81.6089 9.5636 3 Spherical -859.453 0.07 9.4046 4 Spherical 31.6346 1.9701 1.4969 81.6089 9.0064 5 Spherical 142.5616 0.7936 8.762 6 Spherical INF Zoom Interval 8.567 7 Spherical -34.4145 0.65 1.6968 55.5191 5.4756 8 Spherical 12.3456 1.0913 4.8741 9 Aspherical 14.7904 1.2 1.5355 55.6191 4.8601 -11.8510 10 Aspherical 6.0081 0.4897 4.8886 -3.4228 11 Aspherical 16.7164 1.7184 1.6613 20.3796 4.9034 0.7256 12 Aspherical 1367.117 11.6657 4.9837 -2.4543 13 Spherical INF Zoom Interval 7.3035 14 Spherical INF 1.0427 5.2927 15 Spherical 15.3902 3.4752 1.4378 94.5689 5.6661 16 Spherical -20.839 0.07 5.6652 17 Aspherical 20.5732 1.35 1.5355 55.6191 5.5876 -7.2862 18 Aspherical 23.3808 0.07 5.7325 -11.7317 19 Spherical 9.1709 2.1064 1.569 71.319 5.4878 20 Spherical 26.7115 0.9 1.74 28.2795 5.2337 21 Spherical 7.7341 2.1276 4.6516 22 Spherical INF Zoom Interval 4.7116 23 Spherical 7.5737 2.7115 1.6188 60.4991 4.8848 24 Spherical 15.7788 0.0835 4.5355 25 Aspherical 10.6108 1.4406 1.5879 28.4195 4.4512 -7.7974 26 Aspherical 7.4167 2.7176 3.9313 1.5090 27 Aspherical 6.7635 2.5853 1.5355 55.6191 4.1808 -3.2971 28 Aspherical 8.7124 5.1804 4.3128 0.4354 29 Spherical INF Zoom Interval 4.4042 30 Spherical INF 0.8 1.5167 64.199 4.4064 31 Spherical INF 0.1 4.4164 Image Surface Spherical INF 0 4.4269

[0141] Wherein, the surface number is numbered according to the surface order of each lens, for example, surface number 1 represents the object side surface of the first lens 111, surface number 2 represents the image side surface of the first lens 112, and so on; R is the radius of curvature, representing the bending degree of the lens surface, a positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side; INF represents that the radius of curvature is infinite; T is the thickness, representing the center axis distance from the current surface to the next surface; the units of the radius of curvature and the thickness are millimeters (mm); nd is the refractive index, representing the deflection ability of the material between the current surface and the next surface to the light; a space represents that the current position is air, and the refractive index is 1; vd is the Abbe number, representing the dispersion characteristics of the material between the current surface and the next surface to the light; a space represents that the current position is air; the k coefficient represents the numerical value of the best fitting conical coefficient of the aspheric surface.

[0142] Table 2 shows the values of the zoom intervals in Table 1.

[0143] Table 2: Design values of the zoom intervals of the zoom lens

[0144] Zoom Interval Wide End Sub-Wide Sub-Tele Tele End 6 0.000 6.925 9.495 11.209 13 0.000 -6.925 -9.495 -11.209 22 -0.007 -0.930 -0.696 -0.117 29 0.007 0.930 0.696 0.117

[0145] Its aspherical surface shape equation Z satisfies:

[0146]

[0147] Where r represents the perpendicular distance from the optical axis, Z is the distance sag from the vertex of the aspherical surface at position r along the optical axis; c is the curvature of the fitted sphere, c = 1 / R, where R represents the paraxial radius of curvature of the mirror; k is the conic coefficient; and a2, a3, a4, a5, a6, and a7 are higher-order aspherical coefficients.

[0148] For example, Table 3 details the aspherical coefficients of each lens in this embodiment one by way of a feasible implementation.

[0149] Where -2.117258E-03 indicates that the coefficient a2 of surface number 9 is -2.117258 * 10 -3 And so on.

[0150] Table 3 Design values ​​of aspherical coefficients for various lenses in zoom lenses.

[0151] Surface No. [a2] [a3] [a4] [a5] [a6] [a7] 9 -2.117258E-03 6.108595E-05 -9.171316E-07 6.236809E-09 0.000000E+00 0.000000E+00 10 -1.433625E-03 6.337656E-05 -1.751979E-06 2.379237E-08 0.000000E+00 0.000000E+00 11 -7.793131E-05 1.745421E-05 -9.331649E-07 1.599893E-08 0.000000E+00 0.000000E+00 12 -1.504612E-04 1.280731E-05 -3.502311E-07 3.421397E-09 0.000000E+00 0.000000E+00 17 -6.531906E-04 -9.968600E-06 8.803598E-08 -1.911448E-09 0.000000E+00 0.000000E+00 18 -7.208618E-04 -7.761497E-06 9.596274E-08 -1.144739E-09 0.000000E+00 0.000000E+00 25 5.739350E-05 7.989978E-05 -2.335091E-06 3.258166E-08 0.000000E+00 0.000000E+00 26 -2.233473E-03 1.867528E-04 -5.437677E-06 9.762738E-08 0.000000E+00 0.000000E+00 27 -1.576452E-03 -9.367654E-06 1.560689E-06 -3.514509E-08 0.000000E+00 0.000000E+00 28 -2.388381E-03 -1.163804E-05 1.628262E-06 -4.534375E-08 0.000000E+00 0.000000E+00

[0152] The zoom lens provided in this embodiment achieves the following technical specifications:

[0153] Table 4 Technical Specifications of Zoom Lenses

[0154] Wide End Field of View 24.43 Tele End Field of View 8.42 Wide End Focal Length 10.90 Tele End Focal Length 29.10 Wide End F-Number FNo. 1.65 Tele End F-Number FNo. 1.65 Half Image Height 4.40

[0155] Furthermore, Figure 3 This is a spherical aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention, as shown below. Figure 3 As shown, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is within 0.1mm. The curves at different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Therefore, it can be seen that the zoom lens provided in this embodiment of the invention can correct aberrations well at the wide-angle end.

[0156] Figure 4 The field curvature diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention is shown below. Figure 4 As shown, the horizontal axis represents the field curvature in mm; the vertical axis represents the normalized image height (unitless); where TAN represents meridion and SAG represents arc loss. Figure 4 It can be seen that the zoom lens provided in this embodiment has effectively controlled field curvature, that is, during imaging, the difference between the image quality in the center and the image quality in the periphery is small.

[0157] Figure 5 The distortion graph of the zoom lens provided by the first embodiment of the present application at the wide-angle end is shown in the following figure: Figure 5 As shown in the figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; and the curve represents the distortion graph of the zoom lens provided by the first embodiment of the present application at the wide-angle end. Figure 5 As can be seen, the distortion of the zoom lens provided by the first embodiment of the present application at the wide-angle end is well corrected, with small imaging distortion, meeting the requirement of low distortion.

[0158] Figure 6 The spherical aberration graph of the zoom lens provided by the first embodiment of the present application at the sub-wide-angle end is shown in the following figure: Figure 6 As shown in the figure, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is all within 0.1mm, and the curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small, so it can be known that the zoom lens provided by the first embodiment of the present application can well correct the aberration at the sub-wide-angle end.

[0159] Figure 7 The field curvature graph of the zoom lens provided by the first embodiment of the present application at the sub-wide-angle end is shown in the following figure: Figure 7 As shown in the figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; and the curve represents the field curvature graph of the zoom lens provided by the first embodiment of the present application at the sub-wide-angle end. Figure 7 As can be seen, the field curvature of the zoom lens provided by the first embodiment of the present application is effectively controlled, that is, the difference between the image quality at the center and the image quality at the periphery is small when imaging.

[0160] Figure 8 The distortion graph of the zoom lens provided by the first embodiment of the present application at the sub-wide-angle end is shown in the following figure: Figure 8 As shown in the figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; and the curve represents the distortion graph of the zoom lens provided by the first embodiment of the present application at the sub-wide-angle end. Figure 8 As can be seen, the distortion of the zoom lens provided by the first embodiment of the present application at the sub-wide-angle end is well corrected, with small imaging distortion, meeting the requirement of low distortion.

[0161] Figure 9 The spherical aberration graph of the zoom lens provided by the first embodiment of the present application at the sub-telephoto end is shown in the following figure: Figure 9 As shown in the figure, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is all within 0.1mm, and the curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small, so it can be known that the zoom lens provided by the first embodiment of the present application can well correct the aberration at the sub-telephoto end.

[0162] Figure 10 The field curvature graph of the zoom lens provided by the first embodiment of the present application at the sub-telephoto end is shown in the following figure: Figure 10As shown in the figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. From the figure, it can be seen that the field curvature of the zoom lens is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 10 As can be seen, the zoom lens provided in the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0163] Figure 11 The distortion graph of the zoom lens provided in the embodiment one at the long focal end is as shown in the figure. Figure 11 As shown in the figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; from the figure, it can be seen that the distortion of the zoom lens is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 11 As can be seen, the zoom lens provided in the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0164] Figure 12 The distortion graph of the zoom lens provided in the embodiment one at the long focal end is as shown in the figure. Figure 12 As shown in the figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; from the figure, it can be seen that the distortion of the zoom lens is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0165] Figure 13 The field curvature graph of the zoom lens provided in the embodiment one at the long focal end is as shown in the figure. Figure 13 As shown in the figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. From the figure, it can be seen that the field curvature of the zoom lens is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 13 As can be seen, the zoom lens provided in the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0166] Figure 14 The distortion graph of the zoom lens provided in the embodiment one at the long focal end is as shown in the figure. Figure 14 As shown in the figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; from the figure, it can be seen that the distortion of the zoom lens is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 14 As can be seen, the zoom lens provided in the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0167] Embodiment two

[0168] Figure 15 The structural schematic diagram of the zoom lens provided in the embodiment two at the wide-angle end is as shown in the figure. Figure 16 The structural schematic diagram of the zoom lens provided in the embodiment two at the long focal end is as shown in the figure.Figure 15 and Figure 16 As shown in FIG. 2, the zoom lens provided by the second embodiment of the present application comprises, in order along the optical axis from the object plane to the image plane, a front fixed lens group 11, a variable magnification lens group 12, a rear fixed lens group 13 and a focusing lens group 14. The front fixed lens group 11 comprises, in order along the optical axis from the object side to the image side, a first lens 111, a second lens 112 and a third lens 113; the variable magnification lens group 12 comprises, in order along the optical axis from the object side to the image side, a fourth lens 121, a fifth lens 122 and a sixth lens 123; the rear fixed lens group 13 comprises, in order along the optical axis from the object side to the image side, a seventh lens 131, an eighth lens 132, a ninth lens 133 and a tenth lens 134; and the focusing lens group 14 comprises, in order along the optical axis from the object side to the image side, an eleventh lens 141, a twelfth lens 142 and a thirteenth lens 143. The first lens 111 and the second lens 112 form a first cemented lens group 21, the ninth lens 133 and the tenth lens 134 form a second cemented lens group 22, a diaphragm 15 is located in the optical path between the variable magnification lens group 12 and the rear fixed lens group 13, and a flat glass 16 is arranged on the image side of the thirteenth lens 143.

[0169] For example, Table 5 details the specific optical physical parameters of each lens in the zoom lens provided by the second embodiment of the present application in one possible implementation, and the zoom lens in Table 5 corresponds to the zoom lens shown in FIG. 2. Figure 15 and Figure 16 The zoom lens shown in FIG. 2.

[0170] In the table, the surface number is numbered according to the surface order of each lens, for example, surface number 1 represents the object side surface of the first lens 111, surface number 2 represents the image side surface of the first lens 112, and so on; R is the radius of curvature, representing the bending degree of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, and INF represents that the radius of curvature is infinite; T is the thickness, representing the center axis distance from the current surface to the next surface, and the units of the radius of curvature and the thickness are millimeters (mm); nd is the refractive index, representing the light deflection ability of the material between the current surface and the next surface, and a blank represents that the current position is air, and the refractive index is 1; vd is the Abbe number, representing the chromatic dispersion characteristics of the material between the current surface and the next surface, and a blank represents that the current position is air; and the k coefficient represents the numerical value of the best fitting conic coefficient of the aspheric surface.

[0171] Table 5: Design values of the optical physical parameters of the zoom lens

[0172] Surface No. Surface Type R T nd vd Half Radius k 1 Spherical 20.025 0.95 1.855 23.7896 10.74 2 Spherical 15.8397 4.2578 1.4984 81.6089 10.1708 3 Spherical 176.7819 0.07 9.9507 4 Spherical 28.2033 2.1913 1.4984 81.6089 9.4238 5 Spherical 102.1479 0.6698 9.0664 6 Spherical INF Zoom Interval 8.9253 7 Spherical -55.6675 0.8 1.6998 55.5191 5.6774 8 Spherical 11.1531 1.8251 4.896 9 Aspherical 38.0658 1.2 1.5378 55.6191 4.8394 0.3916 10 Aspherical 7.7369 0.278 4.9296 -5.6519 11 Aspherical 20.28 1.6943 1.6689 20.3796 4.9501 5.9107 12 Aspherical -108.267 11.6603 4.934 0.0000 13 Spherical INF Zoom Interval 7.1226 14 Spherical INF 0.7231 5.2219 15 Spherical 16.6555 3.4749 1.4389 94.5689 5.5279 16 Spherical -17.3537 0.07 5.5556 17 Aspherical 24.2288 1.3775 1.5378 55.6191 5.4594 -17.2225 18 Aspherical 36.4722 0.07 5.5628 -26.8811 19 Spherical 7.8135 2.445 1.5709 71.319 5.2915 20 Spherical 19.6478 0.9 1.7461 28.2795 4.9221 21 Spherical 6.7594 2.3533 4.2923 22 Spherical INF Zoom Interval 4.3491 23 Spherical 8.7139 2.9369 1.4984 81.6089 4.439 24 Spherical -88.701 0.463 4.3326 25 Aspherical -6.7991 1.2365 1.6461 23.4996 4.3241 -12.8643 26 Aspherical -7.4458 0.6566 4.2258 -12.1401 27 Aspherical 8.3809 1.875 1.5378 55.6191 4.0017 -4.6214 28 Aspherical 5.7068 5.7216 4.1891 -6.7032 29 Spherical INF Zoom Interval 4.3819 30 Spherical INF 0.8 1.5187 64.199 4.387 31 Spherical INF 0.1 4.4047 Image Surface Spherical INF 0 4.4081

[0173] Wherein, the surface serial number is numbered according to the surface sequence of each lens, for example, the surface serial number 1 represents the object side surface of the first lens 111, the surface serial number 2 represents the image side surface of the first lens 112, and so on; R is the radius of curvature, representing the bending degree of the lens surface, the positive value represents that the surface is bent to the image side, and the negative value represents that the surface is bent to the object side, and INF represents that the radius of curvature is infinite; T is the thickness, representing the center axial distance from the current surface to the next surface, the unit of the radius of curvature and the thickness is millimeter (mm); nd is the refractive index, representing the deflection ability of the material between the current surface and the next surface to the light, and the space represents that the current position is air, and the refractive index is 1; vd is the Abbe number, representing the dispersion characteristics of the material between the current surface and the next surface to the light, and the space represents that the current position is air; the k coefficient represents the numerical size of the best fitting conic coefficient of the aspheric surface.

[0174] Table 6 shows the numerical values of the zoom intervals in Table 5.

[0175] Table 6 shows the numerical values of the zoom intervals in Table 5.

[0176] Zoom Interval Wide End Sub-Wide Sub-Tele Tele End 6 0.000 6.925 9.372 10.884 13 0.000 -6.925 -9.372 -10.884 22 -0.008 -0.740 -0.240 0.560 29 0.008 0.740 0.240 -0.560

[0177] The aspheric surface shape equation Z satisfies:

[0178]

[0179] Wherein, r represents the vertical distance from the optical axis, Z is the distance vector height of the aspheric surface along the optical axis direction at the position r from the vertex of the aspheric surface; c is the curvature of the fitting sphere, c=1 / R, R represents the paraxial radius of curvature of the mirror; k is the conic coefficient; a2, a3, a4, a5, a6 and a7 are high-order aspheric coefficients.

[0180] For example, Table 7 details the aspheric coefficients of each lens in the second embodiment in a feasible implementation manner.

[0181] Wherein, -2.442328E-03 represents that the coefficient a2 of the surface serial number 9 is -2.442328*10 -3 , and so on.

[0182] Table 7 shows the design values of the aspheric coefficients of each lens in the zoom lens.

[0183] Surface No. [a2] [a3] [a4] [a5] [a6] [a7] 9 -2.442328E-03 8.398438E-05 -2.035673E-06 2.957225E-08 -1.099315E-10 -1.694869E-12 10 -1.102070E-03 4.299076E-05 -1.253956E-06 1.081500E-08 8.803192E-10 -2.062029E-11 11 1.012113E-04 -5.797537E-06 -1.898847E-07 1.290549E-08 1.175664E-10 -8.024445E-12 12 -4.816964E-05 1.020108E-05 -3.713939E-07 1.745574E-08 -4.846232E-10 5.534502E-12 17 -5.013038E-04 -1.258246E-05 -3.985256E-08 3.158977E-09 -2.241394E-11 5.705709E-13 18 -5.612130E-04 -1.143879E-05 -2.193541E-09 6.732952E-09 -1.227314E-10 1.056548E-12 25 1.320349E-03 -4.369045E-05 7.527333E-07 6.339832E-09 9.077898E-10 -1.616544E-11 26 8.422607E-04 -3.148306E-05 -3.116458E-07 3.659785E-08 5.059804E-10 7.855434E-12 27 -4.987288E-03 7.126780E-05 -1.953190E-06 -5.683964E-08 9.965566E-09 -2.173183E-10 28 -3.221632E-03 7.808641E-05 -3.021078E-06 2.064340E-07 -7.847727E-09 1.235830E-10

[0184] The zoom lens provided by the embodiment achieves the following technical indexes:

[0185] Table 8 shows the technical indexes of the zoom lens.

[0186] Wide End Field of View 24.90 Tele End Field of View 8.47 Wide End Focal Length 10.89 Tele End Focal Length 29.09 Wide End F-Number FNo. 1.65 Tele End F-Number FNo. 1.65 Half Image Height 4.40

[0187] Further, Figure 31 The spherical aberration diagram of the zoom lens provided by the second embodiment of the present application at the wide-angle end is shown in the figure, Figure 31 As shown in the figure, the spherical aberrations of the zoom lens at different wavelengths (656.3 nm, 587.6 nm and 486.1 nm) are all within 0.1 mm, and the curves of different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, so it can be known that the zoom lens provided by the embodiment of the present application can better correct aberration at the wide-angle end.

[0188] Figure 32 The field curvature diagram of the zoom lens provided by the second embodiment of the present application at the wide-angle end is shown in the figure, Figure 32 As shown in the figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. As can be seen from the figure, Figure 32 It can be seen that the zoom lens provided by the embodiment is effectively controlled in the field curvature, that is, the image quality of the center and the periphery is small when imaging.

[0189] Figure 33 The distortion diagram of the zoom lens provided by the second embodiment of the present application at the wide-angle end is shown in the figure, Figure 33 As shown in the figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; as can be seen from the figure, ​ It can be seen that the distortion of the zoom lens provided by the embodiment at the wide-angle end is better corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0190] ​ The spherical aberration diagram of the zoom lens provided by the second embodiment of the present application at the wide-angle end is shown in the figure, ​ As shown in the figure, the spherical aberrations of the zoom lens at different wavelengths (656.3 nm, 587.6 nm and 486.1 nm) are all within 0.1 mm, and the curves of different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, so it can be known that the zoom lens provided by the embodiment of the present application can better correct aberration at the wide-angle end.

[0191] ​ The field curvature diagram of the zoom lens provided by the second embodiment of the present application at the wide-angle end is shown in the figure, ​ As shown in the figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. As can be seen from the figure, ​ It can be seen that the zoom lens provided by the embodiment is effectively controlled in the field curvature, that is, the image quality of the center and the periphery is small when imaging.

[0192] ​ The distortion diagram of the zoom lens provided by the second embodiment of the present application at the wide-angle end is shown in the figure,​ As shown, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents the normalized image height, which has no unit; from ​ As can be seen, the zoom lens provided in this embodiment has achieved good correction of distortion at the sub-wide-angle end, with small imaging distortion, meeting the requirements for low distortion.

[0193] ​ This is a spherical aberration diagram of the zoom lens at the second telephoto end provided in Embodiment 2 of the present invention, as shown below. ​ As shown, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is within 0.1mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Therefore, it can be seen that the zoom lens provided by the embodiment of the present invention can correct aberrations well at the second telephoto end.

[0194] ​ This is a field curvature diagram of the zoom lens at the sub-telephoto end provided in Embodiment 2 of the present invention, as shown below. ​ As shown, the horizontal axis represents the field curvature in mm; the vertical axis represents the normalized image height (unitless); where TAN represents meridion and SAG represents arc loss. ​ It can be seen that the zoom lens provided in this embodiment has effectively controlled field curvature, that is, during imaging, the difference between the image quality in the center and the image quality in the periphery is small.

[0195] ​ This is a distortion image of the zoom lens at the sub-telephoto end provided in Embodiment 2 of the present invention, as shown below. ​ As shown, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents the normalized image height, which has no unit; from ​ As can be seen, the zoom lens provided in this embodiment has achieved good correction of distortion at the second telephoto end, with small imaging distortion, meeting the requirements for low distortion.

[0196] ​ This is a spherical aberration diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, as shown below. ​ As shown, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is within 0.1mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Therefore, it can be seen that the zoom lens provided by the embodiment of the present invention can correct aberrations well at the telephoto end.

[0197] ​ This is a field curvature diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, as shown below. ​ As shown, the horizontal axis represents the field curvature in mm; the vertical axis represents the normalized image height (unitless); where TAN represents meridion and SAG represents arc loss.​ It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, i.e. the difference between the central image quality and the peripheral image quality is small when imaging.

[0198] ​ The distortion map of the zoom lens provided by the second embodiment of the present application at the long-focus end is shown in FIG. 6, where the horizontal coordinate represents the size of the distortion in % and the vertical coordinate represents the normalized image height without unit. ​ It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, i.e. the difference between the central image quality and the peripheral image quality is small when imaging. ​ It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, i.e. the difference between the central image quality and the peripheral image quality is small when imaging.

[0199] Embodiment Three

[0200] ​ The structural schematic diagram of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in FIG. 8. ​ The structural schematic diagram of the zoom lens provided by the third embodiment of the present application at the long-focus end is shown in FIG. 9. ​ And ​ The zoom lens provided by the third embodiment of the present application includes, in order along the optical axis from the object plane to the image plane, a front fixed lens group 11, a variable magnification lens group 12, a rear fixed lens group 13 and a focusing lens group 14. The front fixed lens group 11 includes, in order along the optical axis from the object side to the image side, a first lens 111, a second lens 112 and a third lens 113, the variable magnification lens group 12 includes, in order along the optical axis from the object side to the image side, a fourth lens 121, a fifth lens 122 and a sixth lens 123, the rear fixed lens group 13 includes, in order along the optical axis from the object side to the image side, a seventh lens 131, an eighth lens 132, a ninth lens 133 and a tenth lens 134, and the focusing lens group 14 includes, in order along the optical axis from the object side to the image side, an eleventh lens 141, a twelfth lens 142 and a thirteenth lens 143. The first lens 111 and the second lens 112 form a first cemented lens group 21, the ninth lens 133 and the tenth lens 134 form a second cemented lens group 22, a diaphragm 15 is located in the optical path between the variable magnification lens group 12 and the rear fixed lens group 13, and a flat glass 16 is arranged on the image side of the thirteenth lens 143.

[0201] For example, Table 9 details the specific optical physical parameters of each lens in the zoom lens provided by the third embodiment of the present application in a feasible implementation manner, and the zoom lens in Table 9 corresponds to the zoom lens shown in FIG. 9. ​ And ​ The zoom lens shown in FIG. 9.

[0202] Wherein, the surface serial number is numbered according to the surface sequence of each lens, for example, the surface serial number 1 represents the object side surface of the first lens 111, the surface serial number 2 represents the image side surface of the first lens 112, and so on; R is the radius of curvature, representing the bending degree of the lens surface, the positive value represents that the surface is bent to the image side, and the negative value represents that the surface is bent to the object side, and INF represents that the radius of curvature is infinite; T is the thickness, representing the center axial distance of the current surface to the next surface, the unit of the radius of curvature and the thickness is millimeter (mm); nd is the refractive index, representing the deflection ability of the material between the current surface and the next surface to the light, and the space represents that the current position is air, and the refractive index is 1; vd is the Abbe number, representing the dispersion characteristics of the material between the current surface and the next surface to the light, and the space represents that the current position is air; the k coefficient represents the numerical value of the best fitting conic coefficient of the aspheric surface.

[0203] Table 9: Design values of optical physical parameters of the zoom lens

[0204] ​ ​ R T ​ ​ ​ k 1 ​ 19.0741 0.95 1.8126 25.4795 10.7311 2 ​ 14.7616 4.6075 1.4984 81.6089 10.1038 3 ​ 182.8013 0.07 9.867 4 ​ 24.9436 2.1272 1.4984 81.6089 9.249 5 ​ 63.956 0.5762 8.8684 6 ​ ​ ​ 8.8909 7 ​ 1226.5 0.8 1.6998 55.4391 5.7583 8 ​ 9.2065 1.9531 4.8095 9 ​ 16.8007 1.2 1.5378 55.6191 4.7043 -30.7842 10 ​ 5.7272 0.4004 4.746 -3.9650 11 ​ 14.9718 1.6846 1.6689 20.3796 4.7645 -5.6553 12 ​ 174.8032 11.0563 4.7515 0.0000 13 ​ ​ ​ 7.0155 14 ​ ​ 0.7798 5.113 15 ​ 16.1809 3.3272 1.4389 94.5689 5.412 16 ​ -14.6659 0.07 5.4293 17 ​ 24.1572 1.3502 1.5378 55.6191 5.3003 -22.0662 18 ​ 30.0356 0.07 5.4211 -30.6639 19 ​ 7.5487 2.3149 1.5709 71.319 5.1461 20 ​ 19.648 0.9 1.7357 32.2194 4.8121 21 ​ 6.3744 2.6611 4.1909 22 ​ ​ ​ 4.3609 23 ​ 10.6391 2.972 1.4389 94.5689 4.4671 24 ​ -25.252 0.191 4.4844 25 ​ -8.0258 1.2793 1.6898 18.1196 4.4729 -19.3450 26 ​ -9.5714 0.5084 4.4291 -20.3920 27 ​ 5.3893 1.8985 1.5378 55.6191 4.3393 -1.4631 28 ​ 4.5503 6.1523 4.2563 -3.5262 29 ​ ​ ​ 4.3756 30 ​ ​ 0.8 1.5187 64.199 4.3847 31 ​ ​ 0.1 4.3994 ​ ​ ​ 0 4.4111

[0205] Table 10 represents the numerical values of the zoom intervals in Table 9.

[0206] Table 10: Design values of the zoom intervals of the zoom lens

[0207] ​ ​ ​ ​ ​ 6 0.000 6.503 8.846 10.324 13 0.000 -6.503 -8.846 -10.324 22 -0.007 -0.790 -0.350 0.425 29 0.007 0.790 0.350 -0.425

[0208] The aspheric surface shape equation Z satisfies:

[0209]

[0210] Wherein, r represents the vertical distance from the optical axis, Z is the distance vector height of the aspheric surface from the aspheric surface vertex when the aspheric surface is in the position r along the optical axis direction; c is the curvature of the fitting sphere, c = 1 / R, R represents the paraxial radius of curvature of the mirror; k is the conic coefficient; a2, a3, a4, a5, a6 and a7 are high-order aspheric coefficients.

[0211] For example, Table 11 details the aspheric coefficients of each lens in this embodiment in a possible implementation manner.

[0212] Table 11: Design values of the aspheric coefficients of each lens in the zoom lens

[0213] ​ [a2] [a3] [a4] [a5] [a6] [a7] 9 -2.423179E-03 5.474272E-05 -2.275152E-07 -1.304940E-08 -1.823352E-11 5.742055E-12 10 -1.270382E-03 2.788531E-05 -1.964911E-07 -1.160872E-08 4.513854E-10 2.766997E-12 11 2.370014E-04 -8.322064E-06 -6.767280E-08 9.491525E-09 -2.566350E-10 9.760008E-12 12 -2.865361E-04 1.218309E-05 1.717426E-08 -8.305920E-09 -4.519778E-11 5.763739E-12 17 -6.594906E-04 -1.330444E-05 -1.088926E-07 4.113856E-09 1.076226E-10 -2.769834E-12 18 -6.663022E-04 -1.415091E-05 1.186900E-07 2.280984E-09 3.843841E-11 -1.613436E-12 25 1.503526E-03 -6.024225E-05 9.764229E-07 -3.598264E-09 4.442928E-10 -2.750185E-12 26 1.242339E-03 -5.194266E-05 1.001731E-06 -1.409029E-08 -7.140930E-10 6.684622E-11 27 -3.912822E-03 7.375570E-05 -1.204474E-06 -1.310215E-08 -2.515505E-09 2.036890E-10 28 -2.128253E-03 3.828408E-05 -1.380118E-06 1.101898E-07 -8.211664E-09 2.644644E-10

[0214] Wherein, -2.423179E-03 represents that the coefficient a2 of the surface serial number 9 is -2.423179*10 -3 , and so on.

[0215] The zoom lens provided by the embodiment achieves the following technical indexes:

[0216] Technical index of zoom lens

[0217] ​ 24.35 ​ 8.45 ​ 10.89 ​ 29.26 ​ 1.65 ​ 1.66 ​ 4.40

[0218] Further, ​ The spherical aberration diagram of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in the following figure: ​ As shown in the following figure, the spherical aberrations of the zoom lens at different wavelengths (656.3 nm, 587.6 nm and 486.1 nm) are all within 0.1 mm, and the curves of different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, so it can be known that the zoom lens provided by the present application can correct the aberration at the wide-angle end well.

[0219] ​ The field curvature diagram of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in the following figure: ​ As shown in the following figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. From the following figure: ​ It can be seen that the field curvature of the zoom lens provided by the present application is effectively controlled, that is, the difference between the central image quality and the peripheral image quality is small when imaging.

[0220] ​ The distortion diagram of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in the following figure: ​ As shown in the following figure, the horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; from the following figure: Figure 33 It can be seen that the distortion of the zoom lens provided by the present application at the wide-angle end is well corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0221] Figure 34 The spherical aberration diagram of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in the following figure: Figure 34 As shown in the following figure, the spherical aberrations of the zoom lens at different wavelengths (656.3 nm, 587.6 nm and 486.1 nm) are all within 0.1 mm, and the curves of different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is small, so it can be known that the zoom lens provided by the present application can correct the aberration at the wide-angle end well.

[0222] Figure 35 The field curvature diagram of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in the following figure: Figure 35 As shown in the following figure, the horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. From the following figure: Figure 35It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0223] Figure 36 The distortion graph of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in FIG. 6, wherein the horizontal coordinate represents the size of the distortion, in %; the vertical coordinate represents the normalized image height, without unit; and the distortion graph is shown in FIG. 6. Figure 36 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 36 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0224] Figure 37 The distortion graph of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in FIG. 6, wherein the horizontal coordinate represents the size of the distortion, in %; the vertical coordinate represents the normalized image height, without unit; and the distortion graph is shown in FIG. 6. Figure 37 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0225] Figure 38 The distortion graph of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in FIG. 6, wherein the horizontal coordinate represents the size of the distortion, in %; the vertical coordinate represents the normalized image height, without unit; and the distortion graph is shown in FIG. 6. Figure 38 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 38 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0226] Figure 39 The distortion graph of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in FIG. 6, wherein the horizontal coordinate represents the size of the distortion, in %; the vertical coordinate represents the normalized image height, without unit; and the distortion graph is shown in FIG. 6. Figure 39 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. Figure 39 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0227] Figure 40 The distortion graph of the zoom lens provided by the third embodiment of the present application at the wide-angle end is shown in FIG. 6, wherein the horizontal coordinate represents the size of the distortion, in %; the vertical coordinate represents the normalized image height, without unit; and the distortion graph is shown in FIG. 6. Figure 40 It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging. It can be seen that the zoom lens provided by the embodiment effectively controls the field curvature, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0228] Figure 41 The field curvature graph of the zoom lens provided by the third embodiment of the present application at the long focal end is shown in FIG. 8, where the horizontal coordinate represents the size of the field curvature in mm, the vertical coordinate represents the normalized image height without unit, TAN represents the tangential direction, and SAG represents the sagittal direction. Figure 41 As shown in FIG. 8, it can be seen that the field curvature of the zoom lens provided by the third embodiment of the present application is effectively controlled, i.e., the difference between the central image quality and the peripheral image quality is small when imaging. Figure 41

[0229] Figure 42 The distortion graph of the zoom lens provided by the third embodiment of the present application at the long focal end is shown in FIG. 9, where the horizontal coordinate represents the size of the distortion in %, the vertical coordinate represents the normalized image height without unit, and Figure 42 As shown in FIG. 9, it can be seen that the distortion of the zoom lens provided by the third embodiment of the present application at the long focal end is well corrected, the imaging distortion is small, and the low distortion requirement is met. Figure 42

[0230] Embodiment Four

[0231] Figure 43 The structural schematic diagram of the zoom lens provided by the fourth embodiment of the present application at the wide-angle end is shown in FIG. 10, where the horizontal coordinate represents the size of the field curvature in mm, the vertical coordinate represents the normalized image height without unit, TAN represents the tangential direction, and SAG represents the sagittal direction. Figure 44 The structural schematic diagram of the zoom lens provided by the fourth embodiment of the present application at the long focal end is shown in FIG. 11, where the horizontal coordinate represents the size of the field curvature in mm, the vertical coordinate represents the normalized image height without unit, TAN represents the tangential direction, and SAG represents the sagittal direction. Figure 43 As shown in FIG. 11, it can be seen that the field curvature of the zoom lens provided by the fourth embodiment of the present application is effectively controlled, i.e., the difference between the central image quality and the peripheral image quality is small when imaging. Figure 44 The zoom lens provided by the fourth embodiment of the present application includes, in order along the optical axis from the object plane to the image plane, a front fixed lens group 11, a variable magnification lens group 12, a rear fixed lens group 13, and a focusing lens group 14. The front fixed lens group 11 includes, in order along the optical axis from the object side to the image side, a first lens 111, a second lens 112, and a third lens 113; the variable magnification lens group 12 includes, in order along the optical axis from the object side to the image side, a fourth lens 121, a fifth lens 122, and a sixth lens 123; the rear fixed lens group 13 includes, in order along the optical axis from the object side to the image side, a seventh lens 131, an eighth lens 132, a ninth lens 133, and a tenth lens 134; and the focusing lens group 14 includes, in order along the optical axis from the object side to the image side, an eleventh lens 141, a twelfth lens 142, and a thirteenth lens 143. The first lens 111 and the second lens 112 form a first cemented lens group 21, the ninth lens 133 and the tenth lens 134 form a second cemented lens group 22, a diaphragm 15 is located in the optical path between the variable magnification lens group 12 and the rear fixed lens group 13, and a flat glass 16 is arranged on the image side of the thirteenth lens 143.

[0232] For example, Table 13 details the specific optical physical parameters of each lens in the zoom lens provided by the fourth embodiment of the present application in a feasible implementation manner, and the zoom lens in Table 13 corresponds to Figure 43 and​​Figure 44 The zoom lens shown.

[0233] Wherein, the surface serial number is numbered according to the surface sequence of each lens, for example, the surface serial number 1 represents the object side surface of the first lens 111, the surface serial number 2 represents the image side surface of the first lens 112, and so on; R represents the radius of curvature, which represents the bending degree of the lens surface, the positive value represents that the surface bends to the image side, and the negative value represents that the surface bends to the object side; INF represents that the radius of curvature is infinite; T represents the thickness, which represents the center axis distance from the current surface to the next surface; the units of the radius of curvature and the thickness are millimeters (mm); nd represents the refractive index, which represents the deflection ability of the material between the current surface and the next surface to the light; the space represents that the current position is air, and the refractive index is 1; vd represents the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface to the light; the space represents that the current position is air; the k coefficient represents the numerical value of the best fitting conic coefficient of the aspheric surface.

[0234] Table 13 Design values of optical physical parameters of the zoom lens

[0235] Surface No. Surface Type R T nd vd Half Aperture k 1 Spherical 19.1194 0.95 1.8126 25.4795 10.7034 2 Spherical 14.8218 4.6001 1.4984 81.6089 10.0927 3 Spherical 202.4285 0.07 9.8566 4 Spherical 25.5096 2.099 1.4984 81.6089 9.2418 5 Spherical 66.5144 0.5885 8.8667 6 Spherical INF Zoom Interval 8.869 7 Spherical -2219.92 0.8 1.6998 55.4391 5.7261 8 Spherical 9.7155 1.9639 4.8135 9 Aspherical 20.8472 1.2 1.5378 55.6191 4.717 -30.4458 10 Aspherical 6.094 0.3977 4.7571 -3.1599 11 Aspherical 17.0483 1.6744 1.6689 20.3796 4.7776 -6.1156 12 Aspherical 412.4969 11.1432 4.7933 0.0000 13 Spherical INF Zoom Interval 7.003 14 Spherical INF 0.5165 5.1636 15 Spherical 14.09 3.5719 1.4389 94.5689 5.4686 16 Spherical -22.5093 0.07 5.4635 17 Aspherical 26.0094 1.35 1.5378 55.6191 5.3468 15.7963 18 Aspherical 48.929 0.07 5.2672 -35.3179 19 Spherical 7.8936 2.7982 1.5709 71.319 5.1143 20 Spherical 33.6212 0.9 1.7357 32.2194 4.698 21 Spherical 7.0133 2.6228 4.1633 22 Spherical INF Zoom Interval 4.3514 23 Spherical 10.7952 2.9717 1.4389 94.5689 4.4009 24 Spherical -22.4116 0.1598 4.4216 25 Aspherical -8.2624 1.2637 1.6898 18.1196 4.4091 -22.0253 26 Aspherical -9.4659 0.4224 4.3786 -22.2285 27 Aspherical 4.9537 1.657 1.5378 55.6191 4.2717 -1.6138 28 Aspherical 3.9886 6.0392 4.1782 -3.1078 29 Spherical INF Zoom Interval 4.3633 30 Spherical INF 0.8 1.5187 64.199 4.356 31 Spherical INF 0.1 4.3848 Image Surface Spherical INF 0 4.4093

[0236] Table 14 represents the numerical values of the zoom intervals in Table 13.

[0237] Table 14 Design values of the zoom intervals of the zoom lens

[0238] Zoom Interval Wide End Sub-Wide Sub-Tele Tele End 6 0.000 6.408 8.712 10.160 13 0.000 -6.408 -8.712 -10.160 22 -0.005 -0.905 -0.520 0.200 29 0.005 0.905 0.520 -0.200

[0239] The aspheric surface shape equation Z satisfies:

[0240]

[0241] Wherein, r represents the vertical distance from the optical axis, Z is the distance from the vertex of the aspheric surface when the aspheric surface is at the position r along the optical axis direction, and the distance vector height from the aspheric surface; c is the curvature of the fitting sphere, c = 1 / R, R represents the paraxial radius of curvature of the mirror; k is the conic coefficient; a2, a3, a4, a5, a6 and a7 are high-order aspheric coefficients.

[0242] For example, Table 15 details the aspheric coefficients of each lens in this embodiment four in a possible implementation manner.

[0243] Table 15 Design values of the aspheric coefficients of each lens in the zoom lens

[0244] Surface No. [a2] [a3] [a4] [a5] [a6] [a7] 9 -2.660872E-03 5.832195E-05 3.840376E-07 -5.120331E-08 9.875518E-10 -4.314298E-12 10 -1.682804E-03 4.793736E-05 -3.300108E-07 -3.395334E-08 1.037444E-09 5.683072E-12 11 3.604148E-04 -7.452147E-06 -9.148295E-08 1.973838E-10 -1.030450E-10 1.332444E-11 12 -2.285171E-04 1.267728E-05 2.259248E-07 -3.116076E-08 7.474272E-10 -6.160495E-12 17 -3.222001E-04 -5.073948E-06 -8.040605E-08 4.828540E-09 -1.828887E-10 1.806782E-12 18 -2.676900E-05 -6.703919E-06 1.650614E-07 -2.074071E-09 -9.224869E-11 2.578770E-12 25 1.360846E-03 -5.721489E-05 1.232703E-06 -9.069554E-08 5.539027E-09 -8.847510E-11 26 1.211201E-03 -6.207962E-05 3.530308E-07 2.169386E-08 -3.048552E-10 5.650148E-11 27 -3.958327E-03 5.691586E-05 -2.752601E-06 1.155014E-08 6.969675E-09 -7.852618E-11 28 -2.083679E-03 1.026886E-05 -1.618236E-06 2.139715E-07 -8.703217E-09 1.918672E-10

[0245] Wherein, -2.660872E-03 represents that the coefficient a2 of the surface serial number 9 is -2.660872*10 -3 , and so on.

[0246] The zoom lens provided by the embodiment achieves the following technical indexes:

[0247] Table 16 Technical indexes of the zoom lens

[0248] Wide End Field of View 24.39 Tele End Field of View 8.46 Wide End Focal Length 10.89 Tele End Focal Length 29.10 Wide End F-Number FNo. 1.65 Tele End F-Number FNo. 1.65 Half Image Height 4.40

[0249] Further, Figure 45 The spherical aberration graph of the zoom lens provided by the fourth embodiment of the present application at the wide-angle end is shown in Figure 45 It can be seen that the spherical aberration of the zoom lens provided by the embodiment is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0250] Figure 46 The field curvature graph of the zoom lens provided by the fourth embodiment of the present application at the wide-angle end is shown in Figure 46 The horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. It can be seen from Figure 46 that the field curvature of the zoom lens provided by the embodiment is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0251] Figure 47 The distortion graph of the zoom lens provided by the fourth embodiment of the present application at the wide-angle end is shown in Figure 47 The horizontal coordinate represents the size of the distortion, with the unit of %; the vertical coordinate represents the normalized image height, without unit; it can be seen from Figure 47 that the distortion of the zoom lens provided by the embodiment at the wide-angle end is effectively corrected, and the imaging distortion is small, meeting the requirement of low distortion.

[0252] Figure 48 The spherical aberration graph of the zoom lens provided by the fourth embodiment of the present application at the wide-angle end is shown in Figure 48 It can be seen that the spherical aberration of the zoom lens provided by the embodiment is effectively controlled, that is, the difference between the image quality of the center and the image quality of the periphery is small when imaging.

[0253] Figure 49 The field curvature graph of the zoom lens provided by the fourth embodiment of the present application at the wide-angle end is shown in Figure 49 The horizontal coordinate represents the size of the field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without unit; wherein TAN represents meridian, and SAG represents sagittal. It can be seen fromFigure 49 It can be seen that the zoom lens provided in this embodiment has effectively controlled field curvature, that is, during imaging, the difference between the image quality in the center and the image quality in the periphery is small.

[0254] Figure 50 The distortion diagram of the zoom lens at the sub-wide-angle end provided in Embodiment 4 of the present invention is shown below. Figure 50 As shown, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents the normalized image height, which has no unit; from Figure 50 As can be seen, the zoom lens provided in this embodiment has achieved good correction of distortion at the sub-wide-angle end, with small imaging distortion, meeting the requirements for low distortion.

[0255] Figure 51 This is a spherical aberration diagram of the zoom lens at the second telephoto end provided in Embodiment 4 of the present invention, as shown below. Figure 51 As shown, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is within 0.1mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Therefore, it can be seen that the zoom lens provided by the embodiment of the present invention can correct aberrations well at the second telephoto end.

[0256] Figure 52 This is a field curvature diagram of the zoom lens at the sub-telephoto end provided in Embodiment 4 of the present invention, as shown below. Figure 52 As shown, the horizontal axis represents the field curvature in mm; the vertical axis represents the normalized image height (unitless); where TAN represents meridion and SAG represents arc loss. Figure 52 It can be seen that the zoom lens provided in this embodiment has effectively controlled field curvature, that is, during imaging, the difference between the image quality in the center and the image quality in the periphery is small.

[0257] Figure 53 This is a distortion diagram of the zoom lens at the sub-telephoto end provided in Embodiment 4 of the present invention, as shown below. Figure 53 As shown, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents the normalized image height, which has no unit; from Figure 53 As can be seen, the zoom lens provided in this embodiment has achieved good correction of distortion at the second telephoto end, with small imaging distortion, meeting the requirements for low distortion.

[0258] Figure 54 This is a spherical aberration diagram of the zoom lens at the telephoto end provided in Embodiment 4 of the present invention, as shown below. Figure 54 As shown, the spherical aberration of the zoom lens at different wavelengths (656.3nm, 587.6nm and 486.1nm) is within 0.1mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Therefore, it can be seen that the zoom lens provided by the embodiment of the present invention can correct aberrations well at the telephoto end.

[0259] Figure 55 The field curvature graph of the zoom lens provided by the fourth embodiment of the present application at the long focal end is shown in Fig. 9, in which the horizontal coordinate represents the size of the field curvature in mm, the vertical coordinate represents the normalized image height without unit, TAN represents the tangential, and SAG represents the sagittal. Figure 55 It can be seen from Fig. 9 that the zoom lens provided by the fourth embodiment of the present application is effectively controlled in the field curvature, that is, the difference between the central image quality and the peripheral image quality is small when imaging. Figure 55

[0260] The distortion graph of the zoom lens provided by the fourth embodiment of the present application at the long focal end is shown in Fig. 10, in which the horizontal coordinate represents the size of the distortion in %, the vertical coordinate represents the normalized image height without unit, and Figure 56 It can be seen from Fig. 10 that the zoom lens provided by the fourth embodiment of the present application is effectively corrected in the distortion at the long focal end, the imaging distortion is small, and the low distortion requirement is met. Figure 56 Figure 56 In order to more clearly illustrate the above embodiments, Table 17 details the specific optical physical parameters of each lens in the zoom lenses provided by the first to fourth embodiments of the present application and other possible optical physical parameters.

[0261] Table 17 Design values of optical physical parameters of the zoom lens

[0262] Table 17 Design values of optical physical parameters of the zoom lens

[0263] Example One Example Two Example Three Example Four Lower Limit Upper Limit U1_F / G1_F 0.604 0.601 0.627 0.633 0.58 0.65 L3_F / G1_F 0.419 0.430 0.403 0.397 0.35 0.45 L1_F / L2_F -0.603 -0.541 -0.601 -0.610 -0.65 -0.5 X3 0.637 0.567 0.439 0.446 0.4 0.7 G1_F / W_F 0.320 0.328 0.336 0.336 0.29 0.36 L4_F / G2_F 0.846 0.810 0.761 0.721 0.7 0.9 L5_F / G2_F 0.553 0.584 0.601 0.604 0.52 0.62 L5_F / L6_F -1.289 -1.402 -1.452 -1.610 -1.7 -1.1 G2_F / W_F -0.993 -1.018 -1.079 -1.093 -1.15 -0.9 X6 0.976 1.461 0.842 0.921 0.8 1.6 L7_F / G3_F 1.020 0.838 0.904 0.777 0.7 1.1 L8_F / G3_F 0.078 0.130 0.077 0.156 0 0.2 L9_F / G3_F 0.829 0.777 0.784 0.698 0.6 0.9 L9_F / L10_F -0.439 -0.459 -0.449 -0.442 -0.5 -0.4 G3_F / W_F 0.513 0.650 0.665 0.689 0.45 0.75 X9 0.489 0.431 0.445 0.620 0.4 0.7 L11_F / G4_F 0.864 1.418 1.167 1.228 0.8 1.5 L12_F / G4_F -0.359 -0.047 -0.188 -0.127 -0.4 0.05 X11 0.351 1.218 2.456 2.859 0.2 3 X12 -0.177 0.045 0.088 0.068 -0.2 0.2 L13_F / G4_F 0.468 -0.518 -0.078 -0.220 -0.6 0.6 G4_F / W_F 0.603 0.478 0.533 0.520 0.4 0.65 W_F / T_F 0.375 0.374 0.372 0.374 0.35 G2_L / TTL 0.220 0.214 0.203 0.200 0.19 0.24

[0264] It should be noted that the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments, mutual combinations and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.​

Claims

1. A zoom lens characterized by comprising, in order from the object side to the image side along the optical axis, a front fixed lens group, a variable magnification lens group, a rear fixed lens group, and a focusing lens group; the front fixed lens group and the rear fixed lens group being fixedly disposed, the variable magnification lens group and the focusing lens group being movably disposed in the direction of the optical axis; the front fixed lens group comprising, in order from the object side to the image side along the optical axis, a first lens, a second lens, and a third lens; the variable magnification lens group comprising, in order from the object side to the image side along the optical axis, a fourth lens, a fifth lens, and a sixth lens; the rear fixed lens group comprising, in order from the object side to the image side along the optical axis, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the focusing lens group comprising, in order from the object side to the image side along the optical axis, an eleventh lens, a twelfth lens, and a thirteenth lens; the first lens having a negative refractive power, the second lens having a positive refractive power, the third lens having a positive refractive power; the fourth lens having a negative refractive power, the fifth lens having a negative refractive power, the sixth lens having a positive refractive power; the seventh lens having a positive refractive power, the ninth lens having a positive refractive power, the tenth lens having a negative refractive power; the eleventh lens having a positive refractive power; a focal length of the zoom lens at the wide-angle end being W_F, a focal length of the zoom lens at the telephoto end being T_F; a focal length of the front fixed lens group being G1_F, a focal length of the variable magnification lens group being G2_F, a focal length of the rear fixed lens group being G3_F, a focal length of the focusing lens group being G4_F; a focal length of the first lens being L1_F, a focal length of the second lens being L2_F, a focal length of the third lens being L3_F, a focal length of the fourth lens being L4_F, a focal length of the fifth lens being L5_F, a focal length of the sixth lens being L6_F, a focal length of the seventh lens being L7_F, a focal length of the eighth lens being L8_F, a focal length of the ninth lens being L9_F, a focal length of the tenth lens being L10_F, a focal length of the eleventh lens being L11_F, a focal length of the twelfth lens being L12_F, a focal length of the thirteenth lens being L13_F; wherein: 0.35 ≤ L3_F / G1_F ≤ 0.45, -0.65 ≤ L1_F / L2_F ≤ -0.5; 0.29 ≤ G1_F / W_F ≤ 0.36, 0.7 ≤ L4_F / G2_F ≤ 0.9, 0.52 ≤ L5_F / G2_F ≤ 0.62, -1.7 ≤ L5_F / L6_F ≤ -1.1, -1.15 ≤ G2_F / W_F ≤ -0.9; 0.7 ≤ L7_F / G3_F ≤ 1.1, 0 ≤ L8_F / G3_F ≤ 0.2, 0.6 ≤ L9_F / G3_F ≤ 0.9, -0.5 ≤ L9_F / L10_F ≤ -0.4, 0.45 ≤ G3_F / W_F ≤ 0.75; 0.8 ≤ L11_F / G4_F ≤ 1.5, -0.4 ≤ L12_F / G4_F ≤ 0.

05. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ -0.6 = L13_F / G4_F = 0.6, 0.4 = G4_F / W_F = 0.65, W_F / T_F = 0.

35.

2. The zoom lens according to claim 1, wherein the first lens and the second lens constitute a first cemented lens group; the ninth lens and the tenth lens constitute a second cemented lens group.

3. The zoom lens according to claim 2, wherein a focal power of the first cemented lens group is U1_F, and a focal power of the front fixed lens group is G1_F; wherein 0.58 = U1_F / G1_F = 0.

65.

4. The zoom lens according to claim 1, wherein a curvature of an object side surface of the third lens is L3_c1, a curvature of an image side surface of the third lens is L3_c2, and a shape factor of the third lens is X3, X3 = (L3_c1 - L3_c2) / (L3_c1 + L3_c2); wherein 0.4 = X3 = 0.

7.

5. The zoom lens according to claim 1, wherein a curvature of an object side surface of the sixth lens is L6_c1, a curvature of an image side surface of the sixth lens is L6_c2, and a shape factor of the sixth lens is X6, X6 = (L6_c1 - L6_c2) / (L6_c1 + L6_c2); wherein 0.8 = X6 = 1.

6.

6. The zoom lens according to claim 1, wherein a curvature of an object side surface of the ninth lens is L9_c1, a curvature of an image side surface of the ninth lens is L9_c2, and a shape factor of the ninth lens is X9, X9 = (L9_c1 - L9_c2) / (L9_c1 + L9_c2); wherein 0.4 = X9 = 0.

7.

7. The zoom lens according to claim 1, wherein a curvature of an object side surface of the eleventh lens is L11_c1, a curvature of an image side surface of the eleventh lens is L11_c2, and a shape factor of the eleventh lens is X11, X11 = (L11_c1 - L11_c2) / (L11_c1 + L11_c2); a curvature of an object side surface of the twelfth lens is L12_c1, a curvature of an image side surface of the twelfth lens is L12_c2, and a shape factor of the twelfth lens is X12, X12 = (L12_c1 - L12_c2) / (L12_c1 + L12_c2); wherein 0.2 = X11 = 3, -0.2 = X12 = 0.

2.

8. The zoom lens according to claim 1, wherein a distance that the power variable lens group moves along the optical axis direction from the wide angle end to the telephoto end is G2_L, and an overall length of the zoom lens is TTL; wherein 0.19 = G2_L / TTL = 0.

24.

9. The zoom lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the seventh lens, the ninth lens, the tenth lens, and the eleventh lens are glass spherical lenses; The fifth lens, the sixth lens, the eighth lens, the twelfth lens and the thirteenth lens are plastic aspherical lenses.

10. The zoom lens according to claim 1, wherein, The zoom lens further includes a diaphragm. The diaphragm is located in an optical path between the variable power lens group and the rear fixed lens group.

Images