Zoom lens

Abstract

The zoom lens comprises a compensation lens group and a zoom lens group which are sequentially arranged from an object plane to an image plane along an optical axis, the compensation lens group and the zoom lens group are movably arranged 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 with negative focal power, a second lens with negative focal power and a third lens with positive focal power which are sequentially arranged from the object plane to the image plane along the optical axis; 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 which are sequentially arranged from the object plane to the image plane along the optical axis. According to the technical scheme, the wide-angle zoom lens with excellent characteristics of small size, large aperture, large target surface, high image quality and the like can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a zoom lens. Background Art

[0002] In recent years, the surveillance market has increasingly diversified its demands for lenses. Zoom lenses have attracted much attention due to their variable focal length, long shooting distance, and large shooting angle.

[0003] At present, in order to achieve large aperture and high image quality, conventional zoom lenses will greatly increase the proportion and number of glass lenses used. In some application scenarios that have strict requirements on the size and weight of the lens, the above lenses will be difficult to use. Summary of the invention

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

[0005] The zoom lens provided by the present invention comprises a compensation lens group and a magnification lens group which are arranged in sequence from the object plane to the image plane along the optical axis; the compensation lens group and the magnification lens group are arranged to move along the optical axis direction;

[0006] The compensating lens group has negative optical power, and the zoom lens group has positive optical power;

[0007] The compensation lens group includes a first lens, a second lens and a third lens arranged in sequence from the object plane to the image plane along the optical axis; the zoom lens group includes 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 from the object plane to the image plane along the optical axis;

[0008] The first lens is a negative power lens, the second lens is a negative power lens, the third lens is a positive power lens, the fourth lens is a positive power lens, the fifth lens is a positive power lens, the sixth lens is a positive power lens, the seventh lens is a negative power lens, the eighth lens is a positive power lens, the ninth lens is a negative power lens, and the tenth lens is a positive 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 is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface;

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

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

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

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

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

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

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

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

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

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

[0022] Optionally, 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:

[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, and the focal length of the zoom lens group is F, 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, where:

[0036] 1.5≤Nd1≤1.75.

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

[0038] The refractive index of the fifth lens is Nd5, where:

[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, and the focal length of the zoom lens at the wide-angle end is F w , the total length of the zoom lens at the wide-angle end is TTL_W, where:

[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, where:

[0044] BFL / TTL_W≥0.35.

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

[0046] ID1 / TTL_W ≥ 0.12.

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

[0048] 1.7≤SA D -SA 0.5D / DM1≤2.2.

[0049] The technical solution of the embodiment of the present invention provides a two-component zoom lens, including a compensation lens group and a variable magnification lens group arranged in sequence from the object plane to the image plane along the optical axis, and specifically adopts 10 lenses, which is a small number of lenses, thereby helping to reduce the length of the lens. By reasonably matching the compensation lens group, the variable magnification lens group and the focal length of each lens therein, the aberration can be well corrected to ensure the clarity of the image under different focal lengths. At the same time, the zoom lens has the advantages of small size, ultra-wide angle, large aperture and large target surface, meeting the needs of security monitoring.

[0050] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0053] Figure 2 Schematic diagram of the structure of the zoom lens at the telephoto end provided by the first embodiment of the present invention

[0054] Figure 3 Schematic diagram of axial aberration of a zoom lens at a wide-angle end provided by Embodiment 1 of the present invention;

[0055] Figure 4 is a schematic diagram of axial aberration of a zoom lens at a telephoto end provided by Embodiment 1 of the present invention;

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

[0057] Figure 6 is a light fan diagram of a zoom lens at the telephoto end provided by the first embodiment of the present invention;

[0058] Figure 7is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by Embodiment 1 of the present invention;

[0059] Figure 8 is a field curvature distortion diagram of a zoom lens at a telephoto end provided by the first embodiment of the present invention;

[0060] Fig. 9 is a schematic structural diagram of a zoom lens at a wide-angle end provided by Embodiment 2 of the present invention;

[0061] Fig.10 is a schematic structural diagram of a zoom lens at a telephoto end provided by Embodiment 2 of the present invention;

[0062] Fig.11 is a schematic diagram of axial aberration of a zoom lens at a wide-angle end provided by Embodiment 2 of the present invention;

[0063] Fig.12 is a schematic diagram of axial aberration of a zoom lens at the telephoto end provided by Embodiment 2 of the present invention;

[0064] Fig.13 is a light fan diagram of a zoom lens at the wide-angle end provided by the second embodiment of the present invention;

[0065] Fig.14 is a light fan diagram of a zoom lens at the telephoto end provided by the second embodiment of the present invention;

[0066] Fig.15 is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by Embodiment 2 of the present invention;

[0067] Fig.16 is a field curvature distortion diagram of a zoom lens at a telephoto end provided by Embodiment 2 of the present invention;

[0068] Fig.17 is a schematic structural diagram of a zoom lens at a wide-angle end provided by Embodiment 3 of the present invention;

[0069] Fig.18 is a schematic structural diagram of a zoom lens at a telephoto end provided by Embodiment 3 of the present invention;

[0070] Fig.19 Schematic diagram of axial aberration of a zoom lens at a wide-angle end provided by Embodiment 3 of the present invention;

[0071] Fig. 20 is a schematic diagram of axial aberration of a zoom lens at a telephoto end provided by Embodiment 3 of the present invention;

[0072] Fig.21 is a light fan diagram of a zoom lens at the wide-angle end provided by the third embodiment of the present invention;

[0073] Fig. 22 is a light fan diagram of a zoom lens at the telephoto end provided by the third embodiment of the present invention;

[0074] Fig.23 is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by Embodiment 3 of the present invention;

[0075] Fig.24 This is a field curvature distortion diagram of a zoom lens at the telephoto end provided by Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0076] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0077] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0078] First of all, it should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" and similar words mean that the elements or objects appearing before the word include 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 actual proportions, and the purpose is only to illustrate the content of the present invention.

[0079] Embodiment 1

[0080] Figure 1 is a schematic structural diagram of a zoom lens at a wide-angle end provided by Embodiment 1 of the present invention, Figure 2 is a schematic diagram of the structure of the zoom lens at the telephoto end provided by the first embodiment of the present invention, such as Figure 1 and Figure 2As shown, the zoom lens provided by the present invention comprises a compensation lens group G1 and a magnification lens group G2 which are sequentially arranged along the optical axis from the object plane to the image plane; the compensation lens group G1 and the magnification lens group G2 are arranged to move along the optical axis; the compensation lens group G1 has a negative optical power, and the magnification lens group G2 has a positive optical power; the compensation lens group G1 comprises a first lens L1, a second lens L2 and a third lens L3 which are sequentially arranged along the optical axis from the object plane to the image plane; the magnification lens group G2 comprises a fourth lens L4 and a fifth lens L5 which are sequentially arranged along the optical axis from the object plane to the image plane , sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9 and tenth lens L10; 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 in this embodiment, the compensation lens group G1 and the variable magnification lens group G2 can be arranged in one lens barrel ( Figure 1 The compensating lens group G1 and the variator lens group G2 can move back and forth along the optical axis in the lens barrel. Through the joint movement of the compensating lens group G1 and the variator lens group G2, the focal length of the zoom lens can be continuously changed from wide angle to telephoto, ensuring that the zoom lens has high image quality at each focal position while ensuring the miniaturization of the zoom lens.

[0082] It can be understood that in the process of zooming of the zoom lens by moving the compensation lens group G1 and the variable magnification lens group G2, when the focal length is the shortest, the zoom lens is located at the wide-angle end, and when the focal length is the longest, the zoom lens is located at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical focal powers, and also has different lengths or shapes.

[0083] Furthermore, the focal length is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, and it characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal length, the stronger the ability to bend light, and the smaller the absolute value of the focal length, the weaker the ability to bend light. When the focal length is a positive number, the refraction of light is convergent; when the focal length is a negative number, the refraction of light is divergent. The focal length can be used to characterize a certain refractive surface of a lens (i.e., a surface of a lens), can be used to characterize a certain lens, and can also be used to characterize a system formed by multiple lenses (i.e., a lens group).

[0084] In this embodiment, by setting the compensation lens group G1 to have a negative optical focal length and the zoom lens group G2 to have a positive optical focal length, the optical focal lengths of the compensation lens group G1 and the zoom lens group G2 cooperate with each other, which can improve the aberrations caused by the zoom movement of the compensation lens group G1 and the zoom lens group G2 and ensure the clarity of the image under different focal length states.

[0085] Further, such as Figure 1 and Figure 2 As shown, the compensation lens group G1 includes a first lens L1 with negative power, a second lens L2 with negative power, and a third lens L3 with positive power, which are arranged in sequence from the object plane to the image plane along the optical axis; the zoom lens group G2 includes a fourth lens L4 with positive power, a fifth lens L5 with positive power, a sixth lens L6 with positive power, a seventh lens L7 with negative power, an eighth lens L8 with positive power, a ninth lens L9 with negative power, and a tenth lens L10 with positive power, which are arranged in sequence from the object plane to the image plane along the optical axis. The zoom lens provided by the embodiment of the present invention uses only 10 lenses, and the number of lenses is small, which helps to reduce the length of the lens, so that the total optical length of the lens can be less than 36mm. At the same time, by reasonably matching the optical focal length of the 10 lenses, aberrations can be better corrected, and a large-aperture ultra-wide-angle zoom lens can be realized. The field of view at the wide-angle end is greater than 139°, which is suitable for 1 / 1.8" large-target photosensitive chips to achieve ultra-large-range imaging, thereby meeting a wide range of security monitoring needs.

[0086] In summary, the embodiment of the present invention provides a two-component zoom lens, including a compensation lens group G1 and a variable magnification lens group G2 arranged in sequence from the object plane to the image plane along the optical axis, and specifically uses 10 lenses, which is a small number of lenses, thereby helping to reduce the length of the lens. By reasonably matching the compensation lens group G1, the variable magnification lens group G2 and the focal length of each lens therein, aberrations can be well corrected to ensure the clarity of images under different focal lengths. At the same time, the zoom lens has the advantages of small size, ultra-wide angle, large aperture and large target surface, meeting the needs of security monitoring.

[0087] Based on the above embodiments, Figure 1 Optionally, the first lens L1, the fourth lens L4, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses; 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 all plastic aspherical lenses.

[0088] The zoom lens provided in this embodiment uses only four glass lenses, which can greatly reduce the weight and cost of the zoom lens. In addition, by reasonably matching plastic lenses and glass lenses and utilizing the mutual compensation effect of different materials, the resolution of the zoom lens under high and low temperature conditions is balanced, so that the zoom lens has the characteristics of stable high and low temperature performance, and improves the environmental adaptability of the zoom lens. In addition, it is also beneficial to reduce the total length of the lens.

[0089] The material of the plastic aspherical lens can be various plastics known to those skilled in the art, and the material of the glass spherical lens can be various types of glass known to those skilled in the art, which will not be elaborated or limited in the embodiments of the present invention.

[0090] like Figure 1 As shown, optionally, the surface of the lens adjacent to the object plane is the object surface, and the surface of the lens adjacent to the image plane is the image surface; the object surface of the first lens L1 is convex toward the object plane, and the image surface of the first lens L1 is concave toward the image plane; the object surface of the second lens L2 is concave toward the object plane, and the image surface of the second lens L2 is concave toward the image plane; the object surface of the third lens L3 is convex toward the object plane, and the image surface of the third lens L3 is convex toward the image plane; the object surface of the fourth lens L4 is convex toward the object plane, and the image surface of the fourth lens L4 is convex toward the image plane; the object 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, and 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, and 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, and 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, and 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, and the image side surface of the tenth lens L10 is concave toward the image plane.

[0091] For example, Figure 1 As shown, this embodiment ensures that the optical power and focal length of each lens meet the requirements of the optical power and focal length in the above embodiment by reasonably setting the surface shape of each lens, and at the same time, it can also ensure that the entire zoom lens has a compact structure and a high degree of integration.

[0092] Reference Figure 1Optionally, the focal power of the compensation lens group G1 is Z1, the focal power of the variator lens group G2 is Z2, the focal power of the first lens L1 is Φ1, the focal power of the second lens L2 is Φ2, the combined focal power of the first lens L1 and the second lens L2 is Φ12, the focal power of the eighth lens L8 is Φ8, the focal power of the ninth lens L9 is Φ9, and the focal 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, 1.5≤Φ12 / Z1≤1.7, the light of the off-axis field of view can be incident on the third lens L3 at a smaller angle, which is conducive to better correction of aberrations and ensuring the clarity of images under different focal lengths.

[0094] Among them, by reasonably allocating the optical focal lengths 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 stable during propagation, avoiding excessive deflection of the light on a certain surface and introducing greater aberrations, which is conducive to ensuring 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 setting the sixth lens L6 and the seventh lens L7 to be glued together, the air gap between the sixth lens L6 and the seventh lens L7 can be effectively reduced, thereby further reducing the total length of the lens. In addition, the glued setting between the lenses can reduce the generation of chromatic aberration by complementing the chromatic aberration of the positive and negative optical focal surfaces of the glued lenses, and at the same time use the residual chromatic aberration to balance the chromatic aberration caused by other components of the zoom lens, so that various aberrations of the zoom lens can be fully corrected, and the imaging performance can be improved. Under the premise of compact structure, the resolution can be improved, the distortion and other optical properties can be optimized, and the light loss caused by reflection between the lenses can be reduced, and the illumination can be increased, thereby improving the image quality and the clarity of the lens imaging. In addition, the glued setting between the lenses can also reduce the assembly components between the lenses, simplify the assembly procedures in the lens manufacturing process, reduce costs, and reduce the tolerance sensitivity problems such as tilt / eccentricity of the lens unit caused by the assembly process.

[0097] Reference Figure 1, further optionally, 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 variator 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 optical power of the single lens can be made as small as possible, which is beneficial to reducing high-order phase aberration.

[0100] Optionally, the Abbe number of the sixth lens L6 is relatively large, and the Abbe number of the seventh lens L7 is relatively small. In this case, the sixth lens L6 can be made of a low refractive index material to reduce the cost. Since the Abbe number of the seventh lens L7 is relatively small and the cost is relatively low, a high refractive index material can be selected to reduce the lens tolerance sensitivity.

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

[0102] Reference Figure 1 Optionally, the refractive index of the first lens L1 is Nd1, where: 1.5≤Nd1≤1.75.

[0103] The first lens L1 is made of a low refractive index material to avoid large-angle deflection of incident light, which would result in an excessively large aperture of subsequent lenses. At the same time, low refractive index materials are beneficial for reducing costs.

[0104] like Figure 1 As shown, optionally, the zoom lens further includes an aperture 110, and the aperture 110 is located in the optical path between the fourth lens L4 and the fifth lens L5. By properly setting the position of the aperture 110, the coma generated by the system can be greatly reduced.

[0105] Reference Figure 1 , further optionally, the refractive index of the fifth lens L5 is Nd5, where: 1.43≤Nd5≤1.72.

[0106] By constraining the refractive index of the fifth lens L5 as described above, the aberration caused by the light passing through the aperture 110 can be reduced, thereby improving the image quality.

[0107] like Figure 1As shown, optionally, the zoom lens further includes a filter 120, and the filter 120 is disposed on the image side of the tenth lens L10. Specifically, by disposing the filter 120 between the tenth lens L10 and the image plane (IMA), the filter 120 can filter out unwanted stray light, thereby improving the image quality of the zoom lens.

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

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

[0110] When the above characteristics are met, it is possible to ensure that the zoom lens can achieve focal length change within a shorter total length, thereby 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 achieving miniaturization, which can provide sufficient space for the rear end structure design of the zoom lens, facilitate the assembly of the zoom lens, improve production yield and reduce 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 be kept small while taking into account a larger imaging screen, thereby achieving the purpose of having a small size while being adaptable to a large target chip.

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

[0116] By controlling the sagittal height at different apertures of the tenth lens L10, the positive focal length of the aspheric lens from the center of the aperture to the edge of the aperture can be gradually weakened, so that the focus of the edge field of view gradually moves farther away, thereby obtaining a larger focal length, which is beneficial to correcting the field curvature of the zoom lens and improving image quality.

[0117] In summary, the zoom lens provided by the present invention adopts 4 glass lenses and 6 plastic lenses, and realizes a zoom lens with small volume, low cost, large aperture, large target surface, ultra-wide angle and high image quality by reasonably allocating the optical focal length of each lens and reasonably setting the surface shape of each lens. The field of view of the wide-angle end of the lens exceeds 139°, the total optical length is less than 36mm, and it can be used for 1 / 1.8" large target surface photosensitive chip, and has excellent resolution in high and low temperature environments.

[0118] For example, Table 1 describes in detail the specific optical and physical parameters of each lens in the zoom lens provided in Example 1 of the present invention in a feasible implementation manner. The zoom lens in Table 1 corresponds to Figure 1 and Figure 2 Zoom lens shown.

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

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

[0121] Among them, the surface numbers are numbered according to the surface order of each lens, for example, the surface number "S1" represents the object side of the first lens, the surface number "S2" represents the image side of the first lens, and so on; "STO" represents the aperture of the lens; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the object side, and the center is close to the image plane, and a negative value represents that the surface is bent toward the image side, and the center is close to the object plane, wherein "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the material (nd) represents the refractive index, that is, the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air, and the refractive index is 1; the material (vd) represents the Abbe number, that is, the dispersion characteristics of the material between the current surface and the next surface to light, and a blank 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 variable spacing at the wide-angle and telephoto ends of zoom lenses

[0124] Wide angle Telephoto end Variable spacing 1 7.544 0.911 Variable Spacing 2 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] Among them, the surface shape of the aspheric lens satisfies the formula:

[0127]

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

[0129] Exemplarily, Table 3 describes in detail the aspheric coefficients of each lens in the first embodiment in a feasible implementation manner.

[0130] Table 3 Design values ​​of aspheric coefficients of each lens in zoom lens

[0131] Surface number 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] Among them, 6.825821E-07 means that the coefficient A of the surface number S3 is 6.825821*10 -7 , and so on.

[0133] The zoom lens provided in this embodiment achieves the following technical indicators:

[0134] Table 4 Technical specifications of zoom lenses

[0135]

[0136] Further, Figure 3 is a schematic diagram of axial aberration of a zoom lens at a wide-angle end provided by Embodiment 1 of the present invention, Figure 4 Schematic diagram of axial aberration of a zoom lens at the telephoto end provided by the first embodiment of the present invention. Figure 3 and Figure 4 As shown, the vertical direction represents the normalized aperture size, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength is 546nm, and the horizontal coordinate value represents the offset of the light relative to the image plane, in millimeters; Figure 3 and Figure 4 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, indicating that the axial aberration of the zoom lens is very small, and thus it can be seen that the zoom lens can correct the aberration well.

[0137] Figure 5 is a light fan diagram of a zoom lens at the wide-angle end provided by the first embodiment of the present invention, Figure 6 : is a light fan diagram of a zoom lens at the telephoto end provided by the first embodiment of the present invention, such as Figure 5 and Figure 6As shown in the figure, the horizontal axis of the light fan diagram represents the normalized pupil diameter, and the vertical axis represents the distance that the corresponding light deviates from the principal light on the image plane. It should be noted that the principal light is the light that passes through the center of the entrance pupil. In an ideal state, each curve completely coincides with the horizontal axis, and all light rays in the field of view converge at the same point on the image plane. Figure 5 and Figure 6 As shown, the curves of the light fan diagrams of light rays of different wavelengths in all fields of view are well aligned with the horizontal axis, and the concentration of the curves of each color is relatively high, indicating that the aberrations of each field of view of the zoom lens are well corrected, which can ensure clear imaging of the zoom lens in a wider spectral range.

[0138] Figure 7 is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by Embodiment 1 of the present invention, Figure 8 : is a field curvature distortion diagram of a zoom lens at the telephoto end provided by the first embodiment of the present invention, such as Figure 7 and Figure 8 As shown, in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, in mm; the vertical coordinate represents the normalized image height, without unit; T represents meridian, S represents arc loss; Figure 7 and Figure 8 It can be seen from the left coordinate system that the zoom lens provided by this embodiment effectively controls the field curvature of different wavelengths, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small. In the right coordinate system, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, without units; Figure 8 It can be seen from the coordinate system on the right side of that the distortion of the zoom lens provided in this embodiment at the telephoto end is effectively controlled.

[0139] Embodiment 2

[0140] Fig. 9 is a schematic structural diagram of a zoom lens at a wide-angle end provided by Embodiment 2 of the present invention, Fig.10 is a schematic diagram of the structure of a zoom lens at the telephoto end provided by the second embodiment of the present invention, such as Fig. 9 and Fig.10As shown, the zoom lens provided by the present invention comprises a compensation lens group G1 and a magnification lens group G2 which are sequentially arranged along the optical axis from the object plane to the image plane; the compensation lens group G1 and the magnification lens group G2 are arranged to move along the optical axis; the compensation lens group G1 has a negative optical power, and the magnification lens group G2 has a positive optical power; the compensation lens group G1 comprises a first lens L1, a second lens L2 and a third lens L3 which are sequentially arranged along the optical axis from the object plane to the image plane; the magnification lens group G2 comprises a fourth lens L4 and a fifth lens L5 which are sequentially arranged along the optical axis from the object plane to the image plane , the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the tenth lens L10; 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. The sixth lens L6 and the seventh lens L7 are cemented together, and a stop 110 is provided in the optical path between the fourth lens L4 and the fifth lens L5.

[0141] For example, Table 5 describes in detail the specific optical and physical parameters of each lens in the zoom lens provided in Example 2 of the present invention in a feasible implementation manner. The zoom lens in Table 5 corresponds to Fig. 9 and Fig.10 Zoom lens shown.

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

[0143]

[0144]

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

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

[0147] Table 6 Design values ​​of variable spacing at the wide-angle and telephoto ends of zoom lenses

[0148] Wide angle Telephoto end Variable spacing 1 7.221 0.590 Variable Spacing 2 5.240 11.879

[0149] Exemplarily, Table 7 describes in detail the aspheric coefficients of each lens in the second embodiment in a feasible implementation manner.

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

[0151] Surface number 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] Among them, -6.112989E-04 means that the coefficient A of the surface number S3 is -6.112989*10 -4 , and so on.

[0153] The zoom lens provided in this embodiment achieves the following technical indicators:

[0154] Table 8 Technical specifications of zoom lenses

[0155]

[0156] Further, Fig.11 is a schematic diagram of axial aberration of a zoom lens at a wide-angle end provided by Embodiment 2 of the present invention, Fig.12 Schematic diagram of axial aberration of a zoom lens at the telephoto end provided by the second embodiment of the present invention. Fig.11 and Fig.12 As shown, the vertical direction represents the normalized aperture size, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength is 546nm, and the horizontal coordinate value represents the offset of the light relative to the image plane, in millimeters; Fig.11 and Fig.12 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, indicating that the axial aberration of the zoom lens is very small, and thus it can be seen that the zoom lens can correct the aberration well.

[0157] Fig.13 is a light fan diagram of a zoom lens at the wide-angle end provided by the second embodiment of the present invention, Fig.14 is a light fan diagram of a zoom lens at the telephoto end provided by the second embodiment of the present invention, such as Fig.13 and Fig.14As shown in the figure, the horizontal axis of the light fan diagram represents the normalized pupil diameter, and the vertical axis represents the distance that the corresponding light deviates from the principal light on the image plane. It should be noted that the principal light is the light that passes through the center of the entrance pupil. In an ideal state, each curve completely coincides with the horizontal axis, and all light rays in the field of view converge at the same point on the image plane. Fig.13 and Fig.14 As shown, the curves of the light fan diagrams of light rays of different wavelengths in all fields of view are well aligned with the horizontal axis, and the concentration of the curves of each color is relatively high, indicating that the aberrations of each field of view of the zoom lens are well corrected, which can ensure clear imaging of the zoom lens in a wider spectral range.

[0158] Fig.15 is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by Embodiment 2 of the present invention, Fig.16 is a field curvature distortion diagram of a zoom lens at the telephoto end provided by the second embodiment of the present invention, such as Fig.15 and Fig.16 As shown, in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, in mm; the vertical coordinate represents the normalized image height, without unit; T represents meridian, S represents arc loss; Fig.15 and Fig.16 It can be seen from the left coordinate system that the zoom lens provided by this embodiment effectively controls the field curvature of different wavelengths, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small. In the right coordinate system, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, without units; Fig.16 It can be seen from the coordinate system on the right side of that the distortion of the zoom lens provided in this embodiment at the telephoto end is effectively controlled.

[0159] Embodiment 3

[0160] Fig.17 is a schematic structural diagram of a zoom lens at a wide-angle end provided by Embodiment 3 of the present invention, Fig.18 FIG. 1 is a schematic diagram of the structure of a zoom lens at the telephoto end provided by Embodiment 3 of the present invention. Fig.17 and Fig.18As shown, the zoom lens provided by the present invention comprises a compensation lens group G1 and a magnification lens group G2 which are sequentially arranged along the optical axis from the object plane to the image plane; the compensation lens group G1 and the magnification lens group G2 are arranged to move along the optical axis; the compensation lens group G1 has a negative optical power, and the magnification lens group G2 has a positive optical power; the compensation lens group G1 comprises a first lens L1, a second lens L2 and a third lens L3 which are sequentially arranged along the optical axis from the object plane to the image plane; the magnification lens group G2 comprises a fourth lens L4 and a fifth lens L5 which are sequentially arranged along the optical axis from the object plane to the image plane , the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the tenth lens L10; 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. The sixth lens L6 and the seventh lens L7 are cemented together, and a stop 110 is provided in the optical path between the fourth lens L4 and the fifth lens L5.

[0161] For example, Table 9 describes in detail the specific optical and physical parameters of each lens in the zoom lens provided in Example 3 of the present invention in a feasible implementation manner. The zoom lens in Table 9 corresponds to Fig.17 and Fig.18 Zoom lens shown.

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

[0163]

[0164]

[0165] Among them, the surface numbers are numbered according to the surface order of each lens, for example, the surface number "S1" represents the object side of the first lens, the surface number "S2" represents the image side of the first lens, and so on; "STO" represents the aperture of the lens; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the object side, and the center is close to the image plane, and a negative value represents that the surface is bent toward the image side, and the center is close to the object plane, wherein "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface; the material (nd) represents the refractive index, that is, the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air, and the refractive index is 1; the material (vd) represents the Abbe number, that is, the dispersion characteristics of the material between the current surface and the next surface to light, and a blank space represents that the current position is air.

[0166] Table 10 shows the values ​​of the variable spacing in Table 9.

[0167] Table 10 Design values ​​of variable spacing at the wide-angle and telephoto ends of zoom lenses

[0168] Wide angle Telephoto end Variable spacing 1 7.854 0.263 Variable Spacing 2 5.243 11.863

[0169] Exemplarily, Table 11 describes in detail the aspheric coefficients of each lens in the third embodiment in a feasible implementation manner.

[0170] Table 11 Design values ​​of aspheric coefficients of each lens in zoom lens

[0171] Surface number 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] Among them, -5.827606E-04 means that the coefficient A of the surface number S3 is -5.827606*10 -4 , and so on.

[0173] The zoom lens provided in this embodiment achieves the following technical indicators:

[0174] Table 12 Technical specifications of zoom lenses

[0175]

[0176] Further, Fig.19 is a schematic diagram of axial aberration of a zoom lens at the wide-angle end provided by Embodiment 3 of the present invention, Fig. 20 Schematic diagram of axial aberration of a zoom lens at the telephoto end provided by Embodiment 3 of the present invention. Fig.19 and Fig. 20 As shown, the vertical direction represents the normalized aperture size, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength is 546nm, and the horizontal coordinate value represents the offset of the light relative to the image plane, in millimeters; Fig.19 and Fig. 20 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, indicating that the axial aberration of the zoom lens is very small, and thus it can be seen that the zoom lens can correct the aberration well.

[0177] Fig.21 is a light fan diagram of a zoom lens at the wide-angle end provided by the third embodiment of the present invention, Fig. 22 is a light fan diagram of a zoom lens at the telephoto end provided by the third embodiment of the present invention, such as Fig.21 and Fig. 22As shown in the figure, the horizontal axis of the light fan diagram represents the normalized pupil diameter, and the vertical axis represents the distance that the corresponding light deviates from the principal light on the image plane. It should be noted that the principal light is the light that passes through the center of the entrance pupil. In an ideal state, each curve completely coincides with the horizontal axis, and all light rays in the field of view converge at the same point on the image plane. Fig.21 and Fig. 22 As shown, the curves of the light fan diagrams of light rays of different wavelengths in all fields of view are well aligned with the horizontal axis, and the concentration of the curves of each color is relatively high, indicating that the aberrations of each field of view of the zoom lens are well corrected, which can ensure clear imaging of the zoom lens in a wider spectral range.

[0178] Fig.23 is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by Embodiment 3 of the present invention, Fig.24 : is a field curvature distortion diagram of a zoom lens at the telephoto end provided by the third embodiment of the present invention, such as Fig.23 and Fig.24 As shown, in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, in mm; the vertical coordinate represents the normalized image height, without unit; T represents meridian, S represents arc loss; Fig.23 and Fig.24 It can be seen from the left coordinate system that the zoom lens provided by this embodiment effectively controls the field curvature of different wavelengths, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small. In the right coordinate system, the horizontal coordinate represents the size of the distortion, in units of %; the vertical coordinate represents the normalized image height, without units; Fig.24 It can be seen from the coordinate system on the right side of that the distortion of the zoom lens provided in this embodiment at the telephoto end is effectively controlled.

[0179] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens, characterized in that: It comprises a compensation lens group and a magnification lens group which are arranged in sequence from the object plane to the image plane along the optical axis; the compensation lens group and the magnification lens group are arranged to move along the optical axis direction; The compensation lens group has negative optical power, and the variable power lens group has positive optical power; The compensation lens group includes a first lens, a second lens and a third lens arranged in sequence from the object plane to the image plane along the optical axis; the variable power lens group includes 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 from the object plane to the image plane along the optical axis; The first lens is a negative power lens, the second lens is a negative power lens, the third lens is a positive power lens, the fourth lens is a positive power lens, the fifth lens is a positive power lens, the sixth lens is a positive power lens, the seventh lens is a negative power lens, the eighth lens is a positive power lens, the ninth lens is a negative power lens, and the tenth lens is a positive power lens.

2. The zoom lens according to claim 1, wherein: 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, wherein: The surface of the lens adjacent to the object plane is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface; The object-side surface of the first lens is convex toward the object plane, and the image-side surface of the first lens is concave toward the image plane; The object-side surface of the second lens is concave toward the object plane, and the image-side surface of the second lens is concave toward the image plane; The object-side surface of the third lens is convex toward the object plane, and the image-side surface of the third lens is convex toward the image plane; The object-side surface of the fourth lens is convex toward the object plane, and the image-side surface of the fourth lens is convex toward the image plane; The object-side surface of the fifth lens is concave toward the object plane, and the image-side surface of the fifth lens is convex toward the image plane; The object-side surface of the sixth lens is convex toward the object plane, and the image-side surface of the sixth lens is convex toward the image plane; The object-side surface of the seventh lens is concave toward the object plane, and the image-side surface of the seventh lens is concave toward the image plane; The object-side surface of the eighth lens is convex toward the object plane, and the image-side surface of the eighth lens is convex toward the image plane; The object-side surface of the ninth lens is concave toward the object plane, and the image-side surface of the ninth lens is concave toward the image plane; The object-side surface of the tenth lens is convex toward the object plane, and the image-side surface of the tenth lens is concave toward the image plane.

4. The zoom lens according to claim 1, wherein: 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.

5. The zoom lens according to claim 1, wherein: The sixth lens and the seventh lens are cemented together; 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, and the focal length of the variable power 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.

6. The zoom lens according to claim 1, wherein: The refractive index of the first lens is Nd1, where: 1.5≤Nd1≤1.

75.

7. The zoom lens according to claim 1, wherein: The zoom lens further comprises an aperture stop, wherein the aperture stop is located in the optical path between the fourth lens and the fifth lens; The refractive index of the fifth lens is Nd5, wherein: 1.43≤Nd5≤1.

72.

8. The zoom lens according to claim 1, wherein: The displacement of the zoom lens group from the wide-angle end to the telephoto end is D1, and the focal length of the zoom lens at the wide-angle end is F w , the total length of the zoom lens at the wide-angle end is TTL_W, where: 0.18≤D1 / TTL_W≤0.21; 0.12≤F w / TTL_W≤0.13。 9. The zoom lens according to claim 1, wherein: 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, where: BFL / TTL_W≥0.

35.

10. The zoom lens according to claim 1, wherein: The image diameter of the zoom lens is ID1, and the total length of the zoom lens at the wide-angle end is TTL_W, where: ID1 / TTL_W ≥ 0.

12.

11. The zoom lens according to claim 1, wherein: The tenth lens is an aspherical lens, the half-aperture of the tenth lens is DM1, and the half-aperture sag of the object side of the tenth lens is SA D The 0.5 times half-aperture height of the object side of the tenth lens is SA 0.5D ,in: 1.7≤SA D -In 0.5D / DM1≤2.2.

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