A zoom lens

Abstract

The application discloses a zoom lens, which comprises a compensation lens group and a zoom lens group arranged in sequence along an optical axis from an object plane to an image plane; the compensation lens group and the zoom lens group are arranged in a moving mode along the optical axis; the compensation lens group has negative focal power, and the zoom lens group has positive focal power; the compensation lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power arranged in sequence along the optical axis from the object plane to the image plane; and the zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, a ninth lens with negative focal power and a tenth lens with positive focal power arranged in sequence along the optical axis from the object plane to the image plane. The technical scheme of the application can realize a wide-angle zoom lens with small size, large aperture, large target surface, high image quality and other excellent characteristics.

Description

TECHNICAL FIELD

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

[0002] In recent years, the demand for lenses in the monitoring market is becoming more and more diversified. The zoom lens is concerned because of its variable focal length, long shooting distance, large shooting angle and other characteristics.

[0003] At present, in order to achieve the purpose of large aperture and high image quality, the conventional zoom lens will greatly increase the proportion and quantity of glass lenses, which will be difficult to apply in some application scenarios with strict requirements on the volume and weight of the lens. SUMMARY

[0004] The present application provides a zoom lens to realize a wide-angle zoom lens with small volume, large aperture, large target surface, high image quality and other excellent characteristics.

[0005] The zoom lens provided by the present application comprises a compensation lens group and a zoom lens group arranged in order along the optical axis from the object plane to the image plane; the compensation lens group and the zoom lens group are arranged in the direction of the optical axis;

[0006] The compensation lens group has negative refractive power, and the zoom lens group has positive refractive power;

[0007] The compensation lens group comprises a first lens, a second lens and a third lens arranged in order along the optical axis from the object plane to the image plane; the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in order along the optical axis from the object plane to the image plane;

[0008] The first lens is a negative refractive power lens, the second lens is a negative refractive power lens, the third lens is a positive refractive power lens, the fourth lens is a positive refractive power lens, the fifth lens is a positive refractive power lens, the sixth lens is a positive refractive power lens, the seventh lens is a negative refractive power lens, the eighth lens is a positive refractive power lens, the ninth lens is a negative refractive power lens, and the tenth lens is a positive refractive power lens.

[0009] Optionally, the first lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses;

[0010] The second lens, the third lens, the fifth lens, the eighth lens, the ninth lens and the tenth lens are all plastic aspherical lenses.

[0011] Optionally, the surface of the lens adjacent to the object plane side is the object side surface, and the surface of the lens adjacent to the image plane side is the image side surface;

[0012] The object side surface of the first lens is convex towards the object plane, and the image side surface of the first lens is concave towards the image plane;

[0013] The object-side surface of the second lens is concave towards the object plane, and the image-side surface of the second lens is concave towards the image plane;

[0014] The object-side surface of the third lens is convex towards the object plane, and the image-side surface of the third lens is convex towards the image plane;

[0015] The object-side surface of the fourth lens is convex towards the object plane, and the image-side surface of the fourth lens is convex towards the image plane;

[0016] The object-side surface of the fifth lens is concave towards the object plane, and the image-side surface of the fifth lens is convex towards the image plane;

[0017] The object-side surface of the sixth lens is convex towards the object plane, and the image-side surface of the sixth lens is convex towards the image plane;

[0018] The object-side surface of the seventh lens is concave towards the object plane, and the image-side surface of the seventh lens is concave towards the image plane;

[0019] The object-side surface of the eighth lens is convex towards the object plane, and the image-side surface of the eighth lens is convex towards the image plane;

[0020] The object-side surface of the ninth lens is concave towards the object plane, and the image-side surface of the ninth lens is concave towards the image plane;

[0021] The object-side surface of the tenth lens is convex towards the object plane, and the image-side surface of the tenth lens is concave towards the image plane.

[0022] Optionally, the focal power of the compensation lens group is Z1, the focal power of the variable magnification lens group is Z2, the focal power of the first lens is Φ1, the focal power of the second lens is Φ2, the combined focal power of the first lens and the second lens is Φ12, the focal power of the eighth lens is Φ8, the focal power of the ninth lens is Φ9, and the focal power of the tenth lens is Φ10, wherein:

[0023] 0.63≤Φ1 / Z1≤0.85;

[0024] 0.5≤Φ2 / Z1≤0.6;

[0025] 1.5≤Φ12 / Z1≤1.7;

[0026] 1≤Φ8 / Z2≤1.1;

[0027] -2≤Φ9 / Z2≤-1.4;

[0028] 1.45≤Φ10 / Z2≤1.85.

[0029] Optionally, the sixth lens and the seventh lens are cemented;

[0030] the Abbe number of the sixth lens is v6, the Abbe number of the seventh lens is v7, the refractive index of the sixth lens is Nd6, the refractive index of the seventh lens is Nd7, the combined focal length of the sixth lens and the seventh lens is F67, the focal length of the zoom lens group is F, and wherein:

[0031] 45≤|v6-v7|≤63;

[0032] 1.43≤Nd6≤1.54;

[0033] 1.63≤Nd7≤1.85;

[0034] -3.4≤F67 / F≤-2.4.

[0035] Optionally, the refractive index of the first lens is Nd1, and wherein:

[0036] 1.5≤Nd1≤1.75.

[0037] Optionally, the zoom lens further comprises a stop, the stop being located in the optical path between the fourth lens and the fifth lens;

[0038] the refractive index of the fifth lens is Nd5, and wherein:

[0039] 1.43≤Nd5≤1.72.

[0040] Optionally, the displacement of the zoom lens group from the wide angle end to the telephoto end is D1, the focal length of the zoom lens at the wide angle end is F w , and the total length of the zoom lens at the wide angle end is TTL_W, wherein:

[0041] 0.18≤D1 / TTL_W≤0.21;

[0042] 0.12≤F w / TTL_W≤0.13.

[0043] Optionally, the back focal length of the zoom lens at the telephoto end is BFL, and the total length of the zoom lens at the wide angle end is TTL_W, wherein:

[0044] BFL / TTL_W≥0.35.

[0045] Optionally, the image surface diameter of the zoom lens is ID1, and the total length of the zoom lens at the wide angle end is TTL_W, wherein:

[0046] ID1 / TTL_W≥0.12.

[0047] Optionally, the tenth lens is an aspherical lens, the half aperture of the tenth lens is DM1, the half-aperture sag of the object side of the tenth lens is SA D , and the 0.5 times half-aperture sag of the object side of the tenth lens is SA0.5D wherein:

[0048] 1.7≤SA D -SA 0.5D / DM1≤2.2.

[0049] The technical scheme of the embodiment of the present application provides a two-group-element zoom lens, which comprises a compensation lens group and a zoom lens group arranged in sequence along an optical axis from an object plane to an image plane, and specifically adopts 10 lenses, so that the number of lenses is small, thereby helping to reduce the length of the lens. By reasonably matching the compensation lens group, the zoom lens group and the optical power of each lens therein, the aberration can be corrected well, the image clarity under different focal lengths is ensured, and meanwhile, the zoom lens has the advantages of small size, super wide angle, large aperture and large target surface, thereby meeting the needs of security monitoring.

[0050] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0052] Figure 1 is a structural schematic diagram of the zoom lens provided by the first embodiment of the present application at the wide-angle end;

[0053] Figure 2 is a structural schematic diagram of the zoom lens provided by the first embodiment of the present application at the long-focus end

[0054] Figure 3 is an axial aberration schematic diagram of the zoom lens provided by the first embodiment of the present application at the wide-angle end;

[0055] Figure 4 is an axial aberration schematic diagram of the zoom lens provided by the first embodiment of the present application at the long-focus end;

[0056] Figure 5 is a ray fan diagram of the zoom lens provided by the first embodiment of the present application at the wide-angle end;

[0057] Figure 6 is a ray fan diagram of the zoom lens provided by the first embodiment of the present application at the long-focus end;

[0058] Figure 7is a field curvature distortion chart of a zoom lens at a wide-angle end provided by embodiment one of the present application;

[0059] Figure 8 is a field curvature distortion chart of a zoom lens at a long-focus end provided by embodiment one of the present application;

[0060] Figure 9 is a structural schematic diagram of a zoom lens at a wide-angle end provided by embodiment two of the present application;

[0061] Figure 10 is a structural schematic diagram of a zoom lens at a long-focus end provided by embodiment two of the present application;

[0062] Figure 11 is an axial aberration schematic diagram of a zoom lens at a wide-angle end provided by embodiment two of the present application;

[0063] Figure 12 is an axial aberration schematic diagram of a zoom lens at a long-focus end provided by embodiment two of the present application;

[0064] Figure 13 is a light ray light fan diagram of a zoom lens at a wide-angle end provided by embodiment two of the present application;

[0065] Figure 14 is a light ray light fan diagram of a zoom lens at a long-focus end provided by embodiment two of the present application;

[0066] Figure 15 is a field curvature distortion chart of a zoom lens at a wide-angle end provided by embodiment two of the present application;

[0067] Figure 16 is a field curvature distortion chart of a zoom lens at a long-focus end provided by embodiment two of the present application;

[0068] Figure 17 is a structural schematic diagram of a zoom lens at a wide-angle end provided by embodiment three of the present application;

[0069] Figure 18 is a structural schematic diagram of a zoom lens at a long-focus end provided by embodiment three of the present application;

[0070] Figure 19 is an axial aberration schematic diagram of a zoom lens at a wide-angle end provided by embodiment three of the present application;

[0071] Figure 20 is an axial aberration schematic diagram of a zoom lens at a long-focus end provided by embodiment three of the present application;

[0072] Figure 21 is a light ray light fan diagram of a zoom lens at a wide-angle end provided by embodiment three of the present application;

[0073] Figure 22 is a ray fan diagram of a zoom lens at the wide-angle end according to the third embodiment of the present application;

[0074] Figure 23 is a field curvature distortion diagram of a zoom lens at the wide-angle end according to the third embodiment of the present application;

[0075] Figure 24 is a field curvature distortion diagram of a zoom lens at the wide-angle end according to the third embodiment of the present application. DETAILED DESCRIPTION

[0076] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the scope of the present application.

[0077] Various modifications and changes can be made to the present application in matters of form and details without departing from the spirit and scope of the present application, which will be apparent to one of ordinary skill in the art. The present application is intended to cover all such modifications and changes as fall within the scope of the corresponding claims (technical solutions claimed to be protected) and their equivalents. It should be noted that the embodiments provided by the present application can be combined with each other without contradiction, if possible.

[0078] First of all, it should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by those having ordinary skills in the art to which the present application belongs. The terms "first", "second", and similar words used in the present application do not represent any order, number, or importance, but are only used to distinguish different components. "Include" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. In addition, the shapes and sizes of the components in the drawings do not reflect the true proportions, but only serve to illustrate the content of the present application.

[0079] Embodiment One

[0080] Figure 1 is a structural schematic diagram of a zoom lens at the wide-angle end according to the first embodiment of the present application, Figure 2 is a structural schematic diagram of a zoom lens at the wide-angle end according to the first embodiment of the present application, as Figure 1 and Figure 2As shown, the zoom lens provided by the present application comprises a compensation lens group G1 and a zoom lens group G2 arranged in sequence along the optical axis from the object plane to the image plane; the compensation lens group G1 and the zoom lens group G2 are arranged in the direction of the optical axis; the compensation lens group G1 has negative optical power, and the zoom lens group G2 has positive optical power; the compensation lens group G1 comprises a first lens L1, a second lens L2 and a third lens L3 arranged in sequence along the optical axis from the object plane to the image plane; the zoom lens group G2 comprises a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a tenth lens L10 arranged in sequence along the optical axis from the object plane to the image plane; the first lens L1 is a negative power lens, the second lens L2 is a negative power lens, the third lens L3 is a positive power lens, the fourth lens L4 is a positive power lens, the fifth lens L5 is a positive power lens, the sixth lens L6 is a positive power lens, the seventh lens L7 is a negative power lens, the eighth lens L8 is a positive power lens, the ninth lens L9 is a negative power lens, and the tenth lens L10 is a positive power lens.

[0081] In the zoom lens provided by the present embodiment, the compensation lens group G1 and the zoom lens group G2 can be arranged in one lens barrel (not shown in the figure). Figure 1 The compensation lens group G1 and the zoom lens group G2 can reciprocally move along the optical axis in the lens barrel. Through the common movement of the compensation lens group G1 and the zoom lens group G2, the focal length of the zoom lens can realize continuous change from wide angle to long focus, thereby ensuring that the zoom lens has high image quality at each focal point position and small size.

[0082] It can be understood that, in the process of zooming of the zoom lens by moving the compensation lens group G1 and the zoom lens group G2, the shortest focal length is the wide angle end, and the longest focal length is the long focus end. At the wide angle end and the long focus end, the zoom lens has different focal lengths and optical powers, and also has different lengths or forms.

[0083] 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, which represents the ability of the optical system to deflect light. The greater the absolute value of the optical power, the stronger the ability to bend light, and the smaller the absolute value of the optical power, the weaker the ability to bend light. When the optical power is positive, the refraction of light is convergent; when the optical power is negative, the refraction of light is divergent. The optical power can be used to represent a certain refractive surface of a lens (i.e. a surface of the lens), a certain lens, or a system (i.e. a lens group) formed by multiple lenses.

[0084] In the embodiment, by setting the compensation lens group G1 having negative focal power and the variable magnification lens group G2 having positive focal power, the focal power of the compensation lens group G1 and the variable magnification lens group G2 are matched with each other, so that the aberration caused by the zoom movement of the compensation lens group G1 and the variable magnification lens group G2 can be improved, and the image clarity in different focal length states can be ensured.

[0085] Further, as shown in Figure 1 and Figure 2 , the compensation lens group G1 includes, arranged in sequence along the optical axis from the object plane to the image plane, a first lens L1 having negative focal power, a second lens L2 having negative focal power, and a third lens L3 having positive focal power; and the variable magnification lens group G2 includes, arranged in sequence along the optical axis from the object plane to the image plane, a fourth lens L4 having positive focal power, a fifth lens L5 having positive focal power, a sixth lens L6 having positive focal power, a seventh lens L7 having negative focal power, an eighth lens L8 having positive focal power, a ninth lens L9 having negative focal power, and a tenth lens L10 having positive focal power. The zoom lens provided by the embodiment only uses 10 lenses, and the number of lenses is small, so that the lens length can be reduced, and the total optical length of the lens can be less than 36 mm. Meanwhile, by reasonably matching the focal power of the 10 lenses, the aberration can be well corrected, and a super wide-angle zoom lens with a large aperture is realized, the field of view angle of the wide-angle end is greater than 139°, the 1 / 1.8〞 large target photosensitive chip is suitable, super large range imaging is realized, and the demand of large range security monitoring is met.

[0086] In summary, the embodiment of the present application provides a two-group variable zoom lens, which includes, arranged in sequence along the optical axis from the object plane to the image plane, a compensation lens group G1 and a variable magnification lens group G2, and specifically uses 10 lenses, and the number of lenses is small, so that the lens length can be reduced. By reasonably matching the focal power of the compensation lens group G1, the variable magnification lens group G2 and each lens therein, the aberration can be well corrected, the image clarity in different focal length states can be ensured, and meanwhile, the variable zoom lens has the advantages of small size, super wide angle, large aperture and large target, and meets the demand of security monitoring.

[0087] On the basis of the above-mentioned embodiment, referring to Figure 1 , optionally, the first lens L1, the fourth lens L4, the sixth lens L6 and the seventh lens L7 are glass spherical lenses; and the second lens L2, the third lens L3, the fifth lens L5, the eighth lens L8, the ninth lens L9 and the tenth lens L10 are plastic aspherical lenses.

[0088] The zoom lens provided by the embodiment can greatly reduce the weight and cost of the zoom lens, and through reasonable collocation of the plastic lens and the glass lens, the resolving power of the zoom lens under high and low temperature conditions is balanced by using the mutual compensation of different materials, so that the zoom lens has the characteristics of stable high and low temperature performance, and the environmental adaptability of the zoom lens is improved. In addition, it is also beneficial to reduce the total length of the lens.

[0089] The material of the plastic aspheric 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 embodiment of the present application does not elaborate or limit it.

[0090] As shown in Figure 1 the object side surface of the first lens L1 is convex toward the object plane, the image side surface of the first lens L1 is concave toward the image plane; the object side surface of the second lens L2 is concave toward the object plane, the image side surface of the second lens L2 is concave toward the image plane; the object side surface of the third lens L3 is convex toward the object plane, the image side surface of the third lens L3 is convex toward the image plane; the object side surface of the fourth lens L4 is convex toward the object plane, the image side surface of the fourth lens L4 is convex toward the image plane; the object side surface of the fifth lens L5 is concave toward the object plane, the image side surface of the fifth lens L5 is convex toward the image plane; the object side surface of the sixth lens L6 is convex toward the object plane, the image side surface of the sixth lens L6 is convex toward the image plane; the object side surface of the seventh lens L7 is concave toward the object plane, the image side surface of the seventh lens L7 is concave toward the image plane; the object side surface of the eighth lens L8 is convex toward the object plane, the image side surface of the eighth lens L8 is convex toward the image plane; the object side surface of the ninth lens L9 is concave toward the object plane, the image side surface of the ninth lens L9 is concave toward the image plane; the object side surface of the tenth lens L10 is convex toward the object plane, the image side surface of the tenth lens L10 is concave toward the image plane.

[0091] As shown in Figure 1 the embodiment can ensure that the optical power and focal length of each lens meet the requirements of the optical power and focal length in the above embodiment, and also ensure that the entire zoom lens structure is compact and the integration of the zoom lens is high.

[0092] Referring to Figure 1Optionally, the optical power of the compensation lens group G1 is Z1, the optical power of the zoom lens group G2 is Z2, the optical power of the first lens L1 is Φ1, the optical power of the second lens L2 is Φ2, the combined optical power of the first lens L1 and the second lens L2 is Φ12, the optical power of the eighth lens L8 is Φ8, the optical power of the ninth lens L9 is Φ9, and the optical power of the tenth lens L10 is Φ10, wherein: 0.63≤Φ1 / Z1≤0.85; 0.5≤Φ2 / Z1≤0.6; 1.5≤Φ12 / Z1≤1.7; 1≤Φ8 / Z2≤1.1; -2≤Φ9 / Z2≤-1.4; 1.45≤Φ10 / Z2≤1.85.

[0093] Among them, the first lens L1 and the second lens L2 cover the negative optical power of the compensation lens group G1. By setting the optical power Φ1 of the first lens L1, the optical power Φ2 of the second lens L2, and the combined optical power Φ12 of the first lens L1 and the second lens L2 to satisfy 0.63≤Φ1 / Z1≤0.85, 0.5≤Φ2 / Z1≤0.6, and 1.5≤Φ12 / Z1≤1.7, the light rays in the off-axis field of view can be incident on the third lens L3 at a smaller angle, which is beneficial to better correct aberrations and ensure the clarity of the image under different focal length conditions.

[0094] By rationally allocating the optical power of the eighth lens L8, the ninth lens L9, and the tenth lens L10 in the zoom lens group G2, the light can be made to travel smoothly during propagation, avoiding excessive refraction of the light on a certain surface and preventing the introduction of greater aberrations, which helps to ensure the clarity of the image under different focal lengths.

[0095] like Figure 1 As shown, optionally, the sixth lens L6 and the seventh lens L7 are cemented together.

[0096] By cementing the sixth lens (L6) and the seventh lens (L7), the air gap between them can be effectively reduced, thereby further reducing the overall length of the lens. Furthermore, the cementing arrangement between lenses reduces chromatic aberration by utilizing the complementary chromatic aberration of the positive and negative optical power surfaces of the cemented lenses. Simultaneously, the remaining chromatic aberration is used to balance chromatic aberration caused by other components of the zoom lens, allowing various aberrations of the zoom lens to be fully corrected, improving imaging performance. Under the premise of a compact structure, resolution can be improved, optical performance such as distortion can be optimized, and light loss caused by reflections between lenses can be reduced, increasing illumination and thus improving image quality and the sharpness of the lens image. In addition, the cementing arrangement between lenses also reduces the number of assembly components between lenses, simplifying the assembly process in lens manufacturing, reducing costs, and reducing tolerance sensitivity issues such as tilting / eccentricity of lens units during assembly.

[0097] Reference Figure 1, further alternatively, the Abbe number of the sixth lens L6 is v6, the Abbe number of the seventh lens L7 is v7, the refractive index of the sixth lens L6 is Nd6, the refractive index of the seventh lens L7 is Nd7, the combined focal length of the sixth lens L6 and the seventh lens L7 is F67, and the focal length of the zoom lens group G2 is F, wherein:

[0098] 45≤|v6-v7|≤63; 1.43≤Nd6≤1.54; 1.63≤Nd7≤1.85; -3.4≤F67 / F≤-2.4.

[0099] By setting the Abbe number of the sixth lens L6 and the Abbe number of the seventh lens L7 to have a large difference, the single lens power can be as small as possible, which is beneficial to reduce the high-order aberration.

[0100] Alternatively, the Abbe number of the sixth lens L6 is large, and the Abbe number of the seventh lens L7 is small. At this time, the sixth lens L6 can be selected from a low refractive index material to reduce the cost. Since the Abbe number of the seventh lens L7 is small, the cost is low, and a high refractive index material can be selected to reduce the tolerance sensitivity of the lens.

[0101] By setting the ratio of the combined focal length F67 of the sixth lens L6 and the seventh lens L7 to the focal length F of the zoom lens group G2 to satisfy the above range, the powers of different lenses in the cemented lens can be reasonably distributed, avoiding a situation that a certain lens bears too large power, thereby avoiding a situation that the tolerance sensitivity is poor and the yield is low.

[0102] Referring to Figure 1 , alternatively, the refractive index of the first lens L1 is Nd1, wherein: 1.5≤Nd1≤1.75.

[0103] The first lens L1 is selected from a low refractive index material, which can avoid large angle deflection of incident light, resulting in a large aperture of subsequent lenses. At the same time, the low refractive index material is beneficial to reduce the cost.

[0104] As shown in Figure 1 , alternatively, the zoom lens further comprises a diaphragm 110, which is located in the optical path between the fourth lens L4 and the fifth lens L5. By reasonably setting the position of the diaphragm 110, the coma generated by the system can be greatly reduced.

[0105] Referring to Figure 1 , further alternatively, the refractive index of the fifth lens L5 is Nd5, wherein: 1.43≤Nd5≤1.72.

[0106] By the above constraints on the refractive index of the fifth lens L5, the aberration of the light passing through the diaphragm 110 can be reduced, and the image quality can be improved.

[0107] As shown in Figure 1As shown, the zoom lens further comprises an optical filter 120 arranged on the image side of the tenth lens L10. Specifically, by arranging the optical filter 120 between the tenth lens L10 and the image plane (IMA), the optical filter 120 can filter out unwanted stray light, thereby improving the image quality of the zoom lens.

[0108] Optionally, the displacement amount of the zoom lens group G2 from the wide-angle end to the telephoto end is D1, the focal length of the zoom lens at the wide-angle end is F w , and the total length of the zoom lens at the wide-angle end is TTL_W, wherein:

[0109] 0.18≤D1 / TTL_W≤0.21; 0.12≤F w / TTL_W≤0.13.

[0110] When the above characteristics are met, the zoom lens can achieve focal length conversion in a shorter total length, achieving the purpose of miniaturization of the zoom lens.

[0111] Optionally, the back focal length of the zoom lens at the telephoto end is BFL, and the total length of the zoom lens at the wide-angle end is TTL_W, wherein: BFL / TTL_W≥0.35.

[0112] When the above characteristics are met, the zoom lens can have a large back focal ratio on the basis of miniaturization, providing sufficient space for the rear end structure design of the zoom lens, which is conducive to the assembly of the zoom lens, improves production yield, and reduces costs.

[0113] Optionally, the image plane diameter of the zoom lens is ID1, and the total length of the zoom lens at the wide-angle end is TTL_W, wherein: ID1 / TTL_W≥0.12.

[0114] When the above characteristics are met, the zoom lens can have a small volume while taking into account a larger imaging screen, achieving the purpose of small volume while adapting to large target chip.

[0115] Optionally, the tenth lens L10 is an aspherical lens, the half aperture of the tenth lens L10 is DM1, the half aperture sag of the object side of the tenth lens L10 is SA D , and the 0.5 times half aperture sag of the object side of the tenth lens L10 is SA 0.5D , wherein: 1.7≤SA D -SA 0.5D / DM1≤2.2.

[0116] By controlling the sag of the tenth lens L10 at different apertures, the positive focal power of the aspherical lens from the aperture center to the aperture edge can be gradually weakened, so that the focal point of the edge field gradually moves away, a larger focal length is obtained, which is conducive to correcting the field curvature of the zoom lens and improving the image quality.

[0117] In summary, the zoom lens provided by the present application adopts 4 glass lenses and 6 plastic lenses, and through reasonable distribution of the focal power of each lens and reasonable setting of the surface shape of each lens, a zoom lens with small size, low cost, large aperture, large target surface, super wide angle and high image quality is realized, the field of view angle of the wide angle end of the lens is more than 139°, the total optical length is less than 36 mm, and the zoom lens can be applied to 1 / 1.8" large target surface photosensitive chips, and has excellent resolving power in high and low temperature environments.

[0118] For example, Table 1 details the specific optical physical parameters of each lens in the zoom lens provided by the first embodiment of the present application in a feasible implementation manner, and the zoom lens in Table 1 corresponds to the zoom lens shown in Figure 2 and Surface Number .

[0119] Table 1: Design values of optical physical parameters of the zoom lens

[0120] Surface Type Radius of Curvature Thickness Material (nd) Material (vd) Sphere S1 Sphere 62.546 0.650 1.720 34.668 S2 Asphere 5.249 4.859 S3 Asphere -16.719 0.879 1.507 60.000 S4 Asphere 11.262 0.081 S5 Asphere 15.862 1.780 1.644 20.000 S6 Variable Separation 1 -41.919 Sphere S7 Sphere 7.360 2.000 1.579 50.055 S8 STO -89.672 -0.108 PL Infinity Asphere 0.703 S10 Asphere -39.001 1.257 1.451 40.000 S11 Sphere -33.536 0.408 S12 Sphere 6.682 3.757 1.448 70.000 S13 Sphere -6.246 0.485 1.820 24.851 S14 Asphere 11.327 0.054 S15 Asphere 7.369 1.295 1.570 40.000 S16 Asphere -33.184 0.283 S17 Asphere -5.731 0.797 1.630 20.346 S18 Asphere 23.323 0.180 S19 Asphere 4.413 3.157 1.654 20.000 S20 Variable Separation 2 40.158 Asphere S21 Infinity Asphere 0.600 1.517 64.198 S22 Infinity Wide-Angle End 0.100

[0121] In the table, the surface number is numbered according to the surface order of each lens, for example, the surface number "S1" represents the object side surface of the first lens, the surface number "S2" represents the image side surface of the first lens, and the like; "STO" represents the diaphragm of the lens; the radius of curvature represents the bending degree of the lens surface, a positive value represents that the surface is bent towards the object side, the center of the circle is close to the image, and a negative value represents that the surface is bent towards the image side, the center of the circle is close to the object; wherein "PL" represents that the surface is a plane, and the radius of curvature is infinite; the thickness represents the center axis distance from the current surface to the next surface; the material (nd) represents the refractive index, that is, the material between the current surface and the next surface has the deflection ability to the light, and the space represents that the current position is air, and the refractive index is 1; the material (vd) represents the Abbe number, that is, the material between the current surface and the next surface has the dispersion characteristic to the light, and the space represents that the current position is air.

[0122] Table 2 shows the values of the variable spacing in Table 1.

[0123] Table 2: Design values of the variable spacing of the wide angle end and the long focus end of the zoom lens

[0124] Telephoto End Variable Separation 1 Variable Separation 2 7.544 0.911 Surface Number 5.241 11.877

[0125] In this embodiment, the second lens L2, the third lens L3, the fifth lens L5, the eighth lens L8, the ninth lens L9 and the tenth lens L10 are aspherical lenses.

[0126] In the table, the surface shape of the aspherical lens satisfies the formula:

[0127]

[0128] wherein, Z represents the vertex of the aspheric surface; r represents the radial coordinate in the direction perpendicular to the optical axis; c represents the curvature of the fitting sphere, and the value is the reciprocal of the curvature radius; k represents the conic constant; A, B, C, D and E represent the 4th order, 6th order, 8th order, 10th order and 12th order coefficients of the aspheric surface polynomial respectively.

[0129] For example, Table 3 details the aspheric surface coefficients of each lens in the embodiment I in a possible implementation.

[0130] Table 3: Design values of aspheric surface coefficients of each lens in the zoom lens

[0131] Figure 3 k A B C D E F G S3 0.978 6.825821E-07 -6.709791E-07 5.162760E-08 -2.715046E-09 -4.178141E-11 3.194018E-12 3.194018E-12 S4 -2.848 -4.620549E-05 -1.310883E-06 4.333238E-08 1.908314E-09 -2.359823E-10 7.680085E-12 7.680085E-12 S5 2.924 -2.230684E-05 -1.198489E-06 8.404949E-08 1.482829E-09 -6.076287E-11 0.000000E+00 0.000000E+00 S6 -23.662 1.156661E-05 7.498292E-08 -7.612503E-09 5.871346E-09 -2.078699E-10 1.892333E-12 1.892333E-12 S10 -3.431 -3.801607E-06 4.703030E-08 3.648613E-09 8.044796E-11 -1.660034E-11 3.579745E-13 3.579745E-13 S11 -2.685 -5.832129E-06 1.303393E-08 3.375679E-09 4.656808E-10 -3.223135E-11 5.270565E-13 5.270565E-13 S15 -4.068 -4.517385E-05 -6.945196E-06 5.378867E-08 2.421432E-08 7.668950E-11 6.785059E-12 6.785059E-12 S16 -38.755 -5.133628E-05 -5.710822E-06 -5.188732E-08 1.164432E-08 -1.941304E-10 6.573557E-11 6.573557E-11 S17 -23.225 -4.035225E-05 3.851881E-06 -1.270264E-07 -2.667212E-08 3.163894E-10 5.178972E-11 5.178972E-11 S18 -358.219 2.197681E-04 -1.185704E-05 4.290276E-07 3.723454E-08 -4.445926E-09 1.375438E-10 1.375438E-10 S19 -12.290 -5.557468E-05 8.240293E-06 -3.236309E-07 -2.427036E-08 4.457153E-09 -1.439772E-10 -1.439772E-10 S20 -179.814 -8.883205E-05 3.646311E-06 4.179529E-07 -6.683625E-08 3.700041E-09 -7.307844E-11 -7.307844E-11

[0132] wherein, 6.825821E-07 represents that the coefficient A of the surface S3 is 6.825821*10 -7 , and the like.

[0133] The zoom lens provided by the embodiment I reaches the following technical indexes:

[0134] Table 4: Technical indexes of the zoom lens

[0135]

[0136] Further, Figure 4 is a schematic diagram of the axial aberration of a zoom lens provided by the embodiment I at the wide-angle end, Figure 3 is a schematic diagram of the axial aberration of a zoom lens provided by the embodiment I at the long-focus end, as shown in Figure 4 and Figure 3 , the vertical direction represents the normalized aperture size, 0 represents on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the main wavelength is 546 nm, and the horizontal direction coordinate value represents the offset of the light relative to the image surface, in units of millimeters; from Figure 4 and Figure 5 It can be seen that the spherical aberration of the zoom lens under different wavelengths is within 0.05 mm, and the curves of different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is very small, so it can be known that the zoom lens can correct the aberration well.

[0137] Figure 6 is a light ray fan diagram of a zoom lens provided by the embodiment I at the wide-angle end, Figure 5 is a light ray fan diagram of a zoom lens provided by the embodiment I at the long-focus end, as shown in Figure 6 and Figure 5As shown in the ray fan diagram, the horizontal axis represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the chief ray on the image plane, it should be noted that the chief ray is the ray passing through the center of the entrance pupil; in an ideal state, each curve is completely coincident with the horizontal coordinate axis, at this time all the rays in the field of view converge on the same point on the image plane; as shown in Figure 6 and Figure 7 As shown in the ray fan diagram of all wavelengths of the field of view, the curves are well close to the horizontal coordinate, and the concentration of each color curve is high, which indicates that the aberration of each field of view of the zoom lens is well corrected, and clear imaging of the zoom lens in a wide spectral range can be ensured.

[0138] Figure 8 is a field curvature distortion diagram of a zoom lens at the wide-angle end provided by the first embodiment of the present application, Figure 7 is a field curvature distortion diagram of a zoom lens at the long-focus end provided by the first embodiment of the present application, as shown in Figure 8 and Figure 7 As shown in the left coordinate system, the horizontal coordinate represents the size of the field curvature, with units of mm; the vertical coordinate represents the normalized image height, without units; wherein T represents the meridian, and S represents the arc loss; as shown in the left coordinate system of Figure 8 and Figure 8 It can be seen that the field curvature of the zoom lens provided by the embodiment is effectively controlled, that is, the central image quality and the peripheral image quality are small during imaging. In the right coordinate system, the horizontal coordinate represents the size of the distortion, with units of %; the vertical coordinate represents the normalized image height, without units; as shown in the right coordinate system of Figure 9 It can be seen that the distortion of the zoom lens provided by the embodiment is effectively controlled at the long-focus end.

[0139] Embodiment Two

[0140] Figure 10 is a structure schematic diagram of a zoom lens at the wide-angle end provided by the second embodiment of the present application, Figure 9 is a structure schematic diagram of a zoom lens at the long-focus end provided by the second embodiment of the present application, as shown in Figure 10 and Figure 9As shown, the zoom lens provided by the present application comprises a compensation lens group G1 and a variable magnification lens group G2 arranged in sequence along the optical axis from the object plane to the image plane; the compensation lens group G1 and the variable magnification lens group G2 are arranged in movement along the optical axis; the compensation lens group G1 has negative focal power, and the variable magnification lens group G2 has positive focal power; the compensation lens group G1 comprises a first lens L1, a second lens L2 and a third lens L3 arranged in sequence along the optical axis from the object plane to the image plane; the variable magnification lens group G2 comprises a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a tenth lens L10 arranged in sequence along the optical axis from the object plane to the image plane; the first lens L1 is a negative focal power lens, the second lens L2 is a negative focal power lens, the third lens L3 is a positive focal power lens, the fourth lens L4 is a positive focal power lens, the fifth lens L5 is a positive focal power lens, the sixth lens L6 is a positive focal power lens, the seventh lens L7 is a negative focal power lens, the eighth lens L8 is a positive focal power lens, the ninth lens L9 is a negative focal power lens, and the tenth lens L10 is a positive focal power lens; wherein the sixth lens L6 and the seventh lens L7 are cemented, and a diaphragm 110 is arranged in the optical path between the fourth lens L4 and the fifth lens L5.

[0141] 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 a feasible implementation manner, and the zoom lens in Table 5 corresponds to Figure 10 and Wide-Angle End the zoom lens shown in Table 5.

[0142] Table 5: Design values of optical physical parameters of the zoom lens

[0143]

[0144]

[0145] wherein the surface number is numbered according to the surface order of each lens, for example, the surface number "S1" represents the object side surface of the first lens, the surface number "S2" represents the image side surface of the first lens, and so on; "STO" represents the diaphragm of the lens; the curvature radius represents the bending degree of the lens surface, the positive value represents that the surface is bent to the object side, the center of the circle is close to the image plane, the negative value represents that the surface is bent to the image side, and the center of the circle is close to the object plane, wherein "PL" represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the center axis distance from the current surface to the next surface; the material (nd) represents the refractive index, that is, the material between the current surface and the next surface has the ability to deflect light; the space represents that the current position is air, and the refractive index is 1; the material (vd) represents the Abbe number, that is, the material between the current surface and the next surface has the dispersion characteristic of light; and the space represents that the current position is air.

[0146] Table 6 shows the variable spacing values in Table 5.

[0147] Table 6 Design values of variable spacing at wide-angle end and telephoto end of zoom lens

[0148] Telephoto End Variable Separation 1 Variable Separation 2 7.221 0.590 Surface Number 5.240 11.879

[0149] Exemplarily, Table 7 details the aspherical coefficients of each lens in the second embodiment in a possible implementation manner.

[0150] Table 7 Design values of aspherical coefficients of each lens in zoom lens

[0151] Figure 11 k A B C D E F G S3 1.917 -6.112989E-04 -3.082149E-06 -6.181825E-07 5.996985E-08 -2.799834E-09 -6.683208E-11 3.817441E-12 S4 -3.227 1.376818E-04 -4.524056E-05 -1.329713E-06 3.991419E-08 1.549366E-09 -2.449508E-10 9.988288E-12 S5 2.734 2.571963E-04 -2.460931E-05 -1.339795E-06 7.713429E-08 1.425862E-09 -3.507725E-11 0.000000E+00 S6 28.990 -3.602336E-04 9.764218E-06 2.599501E-08 -7.695870E-09 6.007066E-09 -1.983844E-10 7.780659E-13 S10 2.293 -8.499527E-04 -4.417046E-06 3.486723E-08 3.952469E-09 2.564993E-11 -2.004087E-11 1.091590E-13 S11 -6.519 -8.014004E-04 -5.138747E-06 -1.024032E-08 1.391832E-09 3.559245E-10 -3.711073E-11 5.907032E-13 S15 -4.122 -3.487798E-04 -4.706856E-05 -7.270550E-06 7.384274E-09 1.977345E-08 -1.725997E-10 1.088830E-11 S16 -63.165 7.054668E-04 -5.353060E-05 -5.946015E-06 -5.030916E-08 1.224959E-08 -2.553821E-10 4.241220E-11 S17 -24.352 1.964633E-03 -3.947708E-05 4.136469E-06 -1.165129E-07 -2.682476E-08 2.969476E-10 5.572606E-11 S18 -321.422 -1.006180E-03 2.166756E-04 -1.226947E-05 4.117566E-07 3.622075E-08 -4.522436E-09 1.337076E-10 S19 -13.325 -1.437724E-03 -5.739540E-05 7.902627E-06 -3.547760E-07 -2.587746E-08 4.424528E-09 -1.372366E-10 S20 -446.334 -4.596919E-04 -9.644526E-05 3.482695E-06 4.114657E-07 -6.617229E-08 3.774225E-09 -7.728952E-11

[0152] wherein -6.112989E-04 represents that the coefficient A of the surface sequence number S3 is -6.112989*10 -4 , and the like.

[0153] The zoom lens provided by the second embodiment achieves the following technical indexes:

[0154] Table 8 Technical indexes of zoom lens

[0155]

[0156] Further, Figure 12 is an axial aberration diagram of a zoom lens at a wide-angle end provided by the second embodiment of the present application, Figure 11 is an axial aberration diagram of a zoom lens at a telephoto end provided by the second embodiment of the present application, as Figure 12 and Figure 11 indicate that the vertical direction represents the normalized aperture size, 0 represents on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the main wavelength is 546 nm, the horizontal direction coordinate value represents the offset of the light relative to the image surface, and the unit is millimeter; from Figure 12 and Figure 13 It can be seen that the spherical aberration of the zoom lens under different wavelengths is within 0.05 mm, the curves of different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is very small, and thus it can be known that the zoom lens can correct the aberration well.

[0157] Figure 14 is a ray fan diagram of a zoom lens at a wide-angle end provided by the second embodiment of the present application, Figure 13 is a ray fan diagram of a zoom lens at a telephoto end provided by the second embodiment of the present application, as Figure 14 and Figure 13As shown in the ray fan diagram, the horizontal axis represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the chief ray on the image plane, wherein the chief ray is the ray passing through the center of the entrance pupil; in an ideal state, each curve is completely coincident with the horizontal coordinate axis, and at this time, all rays in the field of view converge on the same point on the image plane; as shown in the ray fan diagram of the field of view of 0.5°, Figure 14 and Figure 15 As shown in the ray fan diagram of the field of view of 0.5°, the curves of the rays of different wavelengths are close to the horizontal coordinate, and the curves of each color have high concentration, which indicates that the aberration of each field of view of the zoom lens is well corrected, and clear imaging of the zoom lens in a wide spectral range can be ensured.

[0158] Figure 16 is a field curvature distortion diagram of a zoom lens at the wide-angle end provided by Embodiment Two of the present application, Figure 15 is a field curvature distortion diagram of a zoom lens at the long-focus end provided by Embodiment Two of the present application, as shown in Figure 16 and Figure 15 As shown in the left coordinate system, the horizontal coordinate represents the size of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; wherein T represents the meridian, and S represents the arc loss; as shown in the left coordinate system of Figure 16 and Figure 16 It can be seen that the field curvature of the zoom lens provided by the present embodiment is effectively controlled, that is, the central image quality and the peripheral image quality are small in difference when imaging. In the right coordinate system, the horizontal coordinate represents the size of the distortion, and the unit is %; the vertical coordinate represents the normalized image height, and there is no unit; as shown in the right coordinate system of Figure 17 It can be seen that the distortion of the zoom lens provided by the present embodiment is effectively controlled at the long-focus end.

[0159] Embodiment Three

[0160] Figure 18 is a structural schematic diagram of a zoom lens at the wide-angle end provided by Embodiment Three of the present application, Figure 17 is a structural schematic diagram of a zoom lens at the long-focus end provided by Embodiment Three of the present application, as shown in Figure 18 and Figure 17As shown, the zoom lens provided by the present application comprises a compensation lens group G1 and a variable magnification lens group G2 arranged in sequence along the optical axis from the object plane to the image plane; the compensation lens group G1 and the variable magnification lens group G2 are arranged in the direction of the optical axis; the compensation lens group G1 has negative focal power, and the variable magnification lens group G2 has positive focal power; the compensation lens group G1 comprises a first lens L1, a second lens L2 and a third lens L3 arranged in sequence along the optical axis from the object plane to the image plane; the variable magnification lens group G2 comprises a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a tenth lens L10 arranged in sequence along the optical axis from the object plane to the image plane; the first lens L1 is a negative focal power lens, the second lens L2 is a negative focal power lens, the third lens L3 is a positive focal power lens, the fourth lens L4 is a positive focal power lens, the fifth lens L5 is a positive focal power lens, the sixth lens L6 is a positive focal power lens, the seventh lens L7 is a negative focal power lens, the eighth lens L8 is a positive focal power lens, the ninth lens L9 is a negative focal power lens, and the tenth lens L10 is a positive focal power lens; wherein the sixth lens L6 and the seventh lens L7 are cemented, and a diaphragm 110 is arranged in the optical path between the fourth lens L4 and the fifth lens L5.

[0161] 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 Figure 18 and Wide-Angle End the zoom lens shown in Table 9.

[0162] Table 9: Design values of optical physical parameters of the zoom lens

[0163]

[0164]

[0165] wherein the surface number is numbered according to the surface order of each lens, for example, the surface number "S1" represents the object side surface of the first lens, the surface number "S2" represents the image side surface of the first lens, and so on; "STO" represents the diaphragm of the lens; the curvature radius represents the bending degree of the lens surface, the positive value represents that the surface is bent towards the object side, the center of the circle is close to the image plane, the negative value represents that the surface is bent towards the image side, and the center of the circle is close to the object plane, wherein "PL" represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the center axis distance from the current surface to the next surface; the material (nd) represents the refractive index, that is, 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; the material (vd) represents the Abbe number, that is, the chromatic dispersion characteristic of the material between the current surface and the next surface to the light; and the space represents that the current position is air.

[0166] Table 10 shows the numerical values of the variable intervals in Table 9.

[0167] Table 10 shows the design values of the variable intervals of the wide-angle end and the telephoto end of the zoom lens

[0168] Telephoto End Variable Separation 1 Variable Separation 2 7.854 0.263 Surface Number 5.243 11.863

[0169] For example, Table 11 shows the aspherical coefficients of each lens in the third embodiment in a possible implementation.

[0170] Table 11 shows the design values of the aspherical coefficients of each lens in the zoom lens

[0171] Figure 19 k A B C D E F G S3 2.584 -5.827606E-04 -2.875420E-06 -5.590986E-07 6.364331E-08 -2.960244E-09 -6.160485E-11 3.765517E-12 S4 -3.172 1.781189E-04 -4.112384E-05 -1.230275E-06 4.440057E-08 1.493502E-09 -2.308684E-10 8.087473E-12 S5 2.696 2.468995E-04 -2.395093E-05 -1.421276E-06 7.869758E-08 1.427164E-09 -4.169666E-11 0.000000E+00 S6 37.720 -3.739151E-04 8.007322E-06 1.761031E-08 -1.309677E-08 5.790673E-09 -1.865702E-10 1.134911E-12 S10 -3.433 -8.475149E-04 -3.477408E-06 5.519835E-08 3.204055E-09 -5.039088E-11 -2.223648E-11 1.268013E-13 S11 0.790 -8.279998E-04 -4.326117E-06 -2.981727E-08 1.382066E-10 2.895952E-10 -3.592787E-11 5.758868E-13 S15 -4.682 -4.678828E-04 -6.038521E-05 -6.895786E-06 1.696929E-08 1.916629E-08 -2.805739E-10 5.145720E-12 S16 -478.376 8.985496E-04 -5.815995E-05 -6.242810E-06 -4.099582E-08 1.319597E-08 -3.532731E-10 3.434474E-11 S17 -23.632 1.943078E-03 -3.549875E-05 4.329482E-06 -1.441594E-07 -2.632845E-08 3.699881E-10 4.934104E-11 S18 -325.492 -1.027188E-03 2.230373E-04 -1.195996E-05 4.065990E-07 3.751688E-08 -4.558770E-09 1.247905E-10 S19 -14.238 -1.389460E-03 -4.999622E-05 7.676474E-06 -3.550031E-07 -2.807200E-08 4.329089E-09 -1.338265E-10 S20 -1868.776 -5.908840E-04 -9.507697E-05 2.887312E-06 4.276965E-07 -6.595823E-08 3.732036E-09 -7.773487E-11

[0172] where -5.827606E-04 represents the coefficient A of the surface S3 as -5.827606*10 -4 and so on.

[0173] The zoom lens provided in the third embodiment achieves the following technical indexes:

[0174] Table 12 shows the technical indexes of the zoom lens

[0175]

[0176] Further, Figure 20 is a schematic diagram of the axial aberration of a zoom lens provided in the third embodiment of the present application at the wide-angle end, Figure 19 is a schematic diagram of the axial aberration of a zoom lens provided in the third embodiment of the present application at the telephoto end, as shown in Figure 20 and Figure 19 where the vertical direction represents the normalized aperture size, 0 represents the vertex on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the main wavelength is 546 nm, the horizontal direction coordinate value represents the offset of the light relative to the image surface, and the unit is millimeter; from Figure 20 and Figure 21 It can be seen that the spherical aberration of the zoom lens at different wavelengths is within 0.05 mm, and the curves at different wavelengths are relatively concentrated, which indicates that the axial aberration of the zoom lens is very small, and thus it can be known that the zoom lens can correct aberration well.

[0177] Figure 22 is a ray fan diagram of a zoom lens provided in the third embodiment of the present application at the wide-angle end, Figure 21 is a ray fan diagram of a zoom lens provided in the third embodiment of the present application at the telephoto end, as shown in Figure 22 and Figure 21As shown in the light fan diagram, the horizontal axis represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding light ray from the chief ray on the image plane. It should be noted that the chief ray is the light ray passing through the center of the entrance pupil. In an ideal state, each curve is completely coincident with the horizontal coordinate axis, and at this time, all light rays in the field of view converge on the same point on the image plane. As shown in the light fan diagram of the wide-angle end of the zoom lens of the embodiment one of the present application, Figure 22 and Figure 23 As shown in the light fan diagram of the wide-angle end of the zoom lens of the embodiment one of the present application,

[0178] Figure 24 is a field curvature distortion diagram of a zoom lens at the wide-angle end provided by the embodiment three of the present application, Figure 23 is a field curvature distortion diagram of a zoom lens at the long-focus end provided by the embodiment three of the present application, as shown in the light fan diagram of the long-focus end of the zoom lens of the embodiment three of the present application, Figure 24 and Figure 23 As shown in the left coordinate system, the horizontal coordinate represents the size of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, and there is no unit; wherein T represents the meridian, and S represents the arc loss; as shown in the left coordinate system of the embodiment one of the present application, Figure 24 and Figure 24 It can be seen that the field curvature of the zoom lens provided by the embodiment is effectively controlled, that is, the central image quality and the peripheral image quality are relatively small when imaging. In the right coordinate system, the horizontal coordinate represents the size of the distortion, and the unit is %; the vertical coordinate represents the normalized image height, and there is no unit; as shown in the right coordinate system of the embodiment one of the present application, ​ It can be seen that the distortion of the zoom lens provided by the embodiment is effectively controlled at the long-focus end.

[0179] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A zoom lens, characterized in that, The zoom lens comprises a compensation lens group and a zoom lens group arranged in sequence along the optical axis from the object plane to the image plane; the compensation lens group and the zoom lens group are arranged to move along the optical axis direction; The compensation lens group has negative focal power, and the zoom lens group has positive focal power; The compensation lens group comprises a first lens, a second lens and a third lens arranged in sequence along the optical axis from the object plane to the image plane; the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the optical axis from the object plane to the image plane; The first lens is a negative focal power lens, the second lens is a negative focal power lens, the third lens is a positive focal power lens, the fourth lens is a positive focal power lens, the fifth lens is a positive focal power lens, the sixth lens is a positive focal power lens, the seventh lens is a negative focal power lens, the eighth lens is a positive focal power lens, the ninth lens is a negative focal power lens, and the tenth lens is a positive focal power lens; The focal power of the compensation lens group is Z1, the focal power of the zoom lens group is Z2, the focal power of the first lens is Φ1, the focal power of the second lens is Φ2, the combined focal power of the first lens and the second lens is Φ12, the focal power of the eighth lens is Φ8, the focal power of the ninth lens is Φ9, and the focal power of the tenth lens is Φ10, wherein: 0.63≤Φ1 / Z1≤0.85; 0.5≤Φ2 / Z1≤0.6; 1.5≤Φ12 / Z1≤1.7; 1≤Φ8 / Z2≤1.1; -2≤Φ9 / Z2≤-1.4; 1.45≤Φ10 / Z2≤1.85; In the zoom lens, the number of lenses with focal power is 10.

2. The zoom lens according to claim 1, characterized by The first lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses; The second lens, the third lens, the fifth lens, the eighth lens, the ninth lens and the tenth lens are all plastic aspherical lenses.

3. The zoom lens according to claim 1, characterized by The surface of the lens adjacent to the object plane side is the object side surface, and the surface of the lens adjacent to the image plane side is the image side surface; The object side surface of the first lens is convex towards the object plane, and the image side surface of the first lens is concave towards the image plane; The object side surface of the second lens is concave towards the object plane, and the image side surface of the second lens is concave towards the image plane; The object side surface of the third lens is convex towards the object plane, and the image side surface of the third lens is convex towards the image plane; The object side surface of the fourth lens is convex towards the object plane, and the image side surface of the fourth lens is convex towards the image plane; The object side surface of the fifth lens is concave towards the object plane, and the image side surface of the fifth lens is convex towards the image plane; The object side surface of the sixth lens is convex towards the object plane, and the image side surface of the sixth lens is convex towards the image plane; The object side surface of the seventh lens is concave towards the object plane, and the image side surface of the seventh lens is concave towards the image plane; An object-side surface of the eighth lens is convex toward the object side, and an image-side surface of the eighth lens is convex toward the image side; An object-side surface of the ninth lens is concave toward the object side, and an image-side surface of the ninth lens is concave toward the image side; An object-side surface of the tenth lens is convex toward the object side, and an image-side surface of the tenth lens is concave toward the image side.

4. The zoom lens according to claim 1, characterized by The sixth lens and the seventh lens are cemented; An Abbe number of the sixth lens is v6, an Abbe number of the seventh lens is v7, a refractive index of the sixth lens is Nd6, a refractive index of the seventh lens is Nd7, a combined focal length of the sixth lens and the seventh lens is F67, and a focal length of the zoom lens group is F, wherein: 45≤|v6-v7|≤63; 1.43≤Nd6≤1.54; 1.63≤Nd7≤1.85; -3.4≤F67 / F≤-2.

4.

5. The zoom lens according to claim 1, characterized by A refractive index of the first lens is Nd1, wherein: 1.5≤Nd1≤1.

75.

6. The zoom lens according to claim 1, characterized by The zoom lens further comprises a diaphragm, the diaphragm being located in an optical path between the fourth lens and the fifth lens; A refractive index of the fifth lens is Nd5, wherein: 1.43≤Nd5≤1.

72.

7. The zoom lens according to claim 1, characterized by The displacement amount of the variable magnification lens group from the wide angle end to the telephoto end is D1, the focal length of the zoom lens at the wide angle end is , and the total length of the zoom lens at the wide angle end is wherein: ； 。 8. The zoom lens according to claim 1, characterized by The back focal length of the zoom lens at the long focal end is BFL, the total length of the zoom lens at the wide angle end is wherein: 。 9. The zoom lens according to claim 1, characterized by The image surface diameter of the zoom lens is ID1, the total length of the zoom lens at the wide-angle end is wherein: 。 10. The zoom lens according to claim 1, characterized by The tenth lens is an aspherical lens, a half aperture of the tenth lens is DM1, a half-aperture sag of an object side of the tenth lens is , and a 0.5 times half-aperture sag of the object side of the tenth lens is wherein: 。

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