Zoom lens

Abstract

The invention discloses a zoom lens. The zoom lens comprises a compensation lens group, a diaphragm and a zoom lens group, the compensation lens group and the zoom lens group can move along the optical axis. The focal power of the compensation lens group is negative, and the compensation lens group comprises a first lens, a second lens and a third lens; the focal power of the zoom lens group is positive, and the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens; the first lens, the second lens, the seventh lens, the ninth lens and the eleventh lens are all negative focal power lenses, and the third lens, the fourth lens, the fifth lens, the sixth lens, the eighth lens and the tenth lens are all positive focal power lenses. By adopting the technical scheme, the number of the lenses, the lens group and the focal power of the lenses are reasonably set in the two-component zoom lens, so that the size of an imaging target surface can be effectively enlarged, and the design of the zoom lens with large aperture performance is realized.

Description

Technical Field

[0001] The present invention relates to the field of optical device technology, and in particular to a zoom lens. Background Technology

[0002] In recent years, with the increasingly diversified demands for lens performance in the security monitoring market, zoom lenses with variable focal length capabilities have attracted widespread attention due to their support for long-distance shooting and ultra-wide field of view. To achieve high image quality and large aperture, traditional zoom lenses often use a large number of high-refractive-index, low-dispersion glass elements and significantly increase the number of elements. However, this design results in bulky and heavy lenses, making it difficult to meet the needs of applications that are highly sensitive to size and weight. At the same time, the mainstream image sensors on the current market have gradually transitioned to the 1 / 1.8″ specification, while most large-aperture zoom lenses are still based on the smaller 1 / 2.7″ chip design, limiting the overall system performance. Summary of the Invention

[0003] This invention provides a zoom lens that achieves a high-quality, large-aperture zoom lens design that can be used with a 1 / 1.8” chip.

[0004] This invention provides a zoom lens, including a compensation lens group, an aperture stop, and a zoom lens group arranged sequentially along the optical axis from the object plane to the image plane, wherein both the compensation lens group and the zoom lens group are movable along the optical axis; The optical power of the compensation lens group is negative, and the compensation lens group includes a first lens, a second lens, and a third lens; The optical power of the zoom lens group is positive, and the zoom lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens. The first lens, the second lens, the seventh lens, the ninth lens, and the eleventh lens are all negative power lenses, while the third lens, the fourth lens, the fifth lens, the sixth lens, the eighth lens, and the tenth lens are all positive power lenses.

[0005] Optionally, the focal length of the first lens is f1, the focal length of the second lens is f2, the combined focal length of the first lens and the second lens is f12, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, the focal length of the compensation lens group is Z1, and the focal length of the zoom lens group is Z2. Wherein, 1.16≤f1 / Z1≤1.32; 1.5≤f2 / Z1≤1.82; 0.58≤f12 / Z1≤0.62; 1.05≤f8 / Z2≤1.15;-1.25≤f9 / Z2≤-1.08;0.8≤f10 / Z2≤1.15;

[0006] Optionally, the first lens includes a first object-side surface near the object surface and a first image-side surface near the image surface, wherein the first object-side surface is convex and the first image-side surface is concave. The second lens includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface and the second image-side surface are concave. The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is convex. The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is convex, and the fourth image-side surface is convex. The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is concave, and the fifth image-side surface is convex. The sixth lens includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth object-side surface is convex, and the sixth image-side surface is convex. The seventh lens includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane. The seventh object-side surface is concave, and the seventh image-side surface is concave. The eighth lens includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane. The eighth object-side surface is convex, and the eighth image-side surface is convex. The ninth lens includes a ninth object-side surface near the object plane and a ninth image-side surface near the image plane. The ninth object-side surface is concave, and the ninth image-side surface is either concave or convex. The tenth lens includes a tenth object-side surface near the object plane and a tenth image-side surface near the image plane. The tenth object-side surface is convex, and the tenth image-side surface is convex. The eleventh lens includes an eleventh object-side surface near the object plane and an eleventh image-side surface near the image plane. The eleventh object-side surface is convex, and the eleventh image-side surface is concave.

[0007] Optionally, the displacement of the zoom lens group from the wide-angle end to the telephoto end is D1, and the total length of the zoom lens at the wide-angle end is TTL_W; Where 0.11≤D1 / TTL_W≤0.115.

[0008] 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, 0.18≤BFL / TTL_W≤0.21.

[0009] 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; Where: ID1 / TTL_W≤0.18.

[0010] Optionally, the sixth lens and the seventh lens are cemented together.

[0011] Optionally, the combined focal length of the sixth lens and the seventh lens is f67, and the focal length of the zoom lens group is Z2; wherein, -4≤F67 / Z2≤-1.6; The refractive index of the sixth lens is ND6 and the Abbe number is VD6; the refractive index of the seventh lens is ND7 and the Abbe number is VD7; 1.52≤Nd6≤1.58; where 1.75≤Nd7≤1.87; 17≤|v6-v7|≤60.

[0012] Optionally, the refractive index of the first lens is ND1, the refractive index of the fourth lens is ND4, and the refractive index of the fifth lens is ND5; Among them, 1.55≤Nd1≤1.75; 1.45≤Nd4≤1.72; 1.52≤Nd5≤1.75.

[0013] Optionally, 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, the tenth lens, and the eleventh lens are all plastic aspherical lenses.

[0014] The zoom lens provided by this invention includes a compensation lens group and a zoom lens group. The compensation lens group has negative optical power and includes a first lens with negative optical power, a second lens with negative optical power, and a third lens with positive optical power. The zoom lens group has positive optical power and includes a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, a tenth lens with positive optical power, and an eleventh lens with negative optical power. By employing a specific combination of eleven lenses with optical power, a compact structure, small size, and the ability to effectively expand the imaging target area while strictly controlling the total optical length within 51mm are achieved, along with large aperture performance.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of axial aberration at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention; Figure 5 This is a ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention; Figure 6 This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention; Figure 7 This is a field curvature distortion diagram of a zoom lens at the wide-angle end provided in Embodiment 1 of the present invention; Figure 8 This is a field curvature distortion diagram of a zoom lens at the telephoto end provided in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention; Figure 12 This is a schematic diagram of axial aberration at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention; Figure 13 This is a ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention; Figure 14 This is a ray fan pattern of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention; Figure 15 This is a field curvature distortion diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention; Figure 16 This is a field curvature distortion diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention; Figure 17 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention; Figure 18 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention; Figure 19 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention; Figure 20 This is a schematic diagram of axial aberration at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention; Figure 21 This is a ray fan diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention; Figure 22 This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention; Figure 23 This is a field curvature distortion diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention; Figure 24 This is a field curvature distortion diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] Example 1 Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, as shown below. Figure 1 and Figure 2As shown, the zoom lens provided in Embodiment 1 of the present invention includes a compensation lens group S1, an aperture stop STO, and a zoom lens group S2 arranged sequentially along the optical axis from the object plane to the image plane; both the compensation lens group S1 and the zoom lens group S2 can be moved along the optical axis; the optical power of the compensation lens group S1 is negative, and the compensation lens group S2 includes a first lens 101, a second lens 102, and a third lens 103; the optical power of the zoom lens group S2 is positive, and the zoom lens group includes a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, and an eleventh lens 111; the first lens 101, the second lens 102, the seventh lens 107, the ninth lens 109, and the eleventh lens 111 are all negative optical power lenses, and the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the eighth lens 108, and the tenth lens 110 are all positive optical power lenses.

[0020] Specifically, in this embodiment of the invention, the zoom lens includes a compensation lens group S1, an aperture stop STO, and a zoom lens group S2, which can be housed within a single lens barrel. Figure 1 and Figure 2 (Not shown in the image). The compensation lens group S1 and the zoom lens group S2 can reciprocate along the optical axis in the lens barrel. Through the movement of the compensation lens group S1 and the zoom lens group S2, 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 point.

[0021] It is understandable that during the zoom process achieved by moving the compensation lens group S1 and the zoom lens group S2, the zoom lens is at its shortest focal length, i.e., at the wide-angle end, and at its longest focal length, i.e., at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths, as well as different lengths or shapes.

[0022] Furthermore, optical power is equal to the difference between the convergence of the light beam at the image plane and the convergence of the light beam at the object plane; it characterizes the zoom lens's ability to deflect light. The larger the absolute value of the optical power, the stronger its ability to bend light; the smaller the absolute value, the weaker its ability to bend light. When the optical power is positive, the refraction of light is converging; when the optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a zoom lens (i.e., a lens group) formed by multiple lenses. In this embodiment of the invention, the zoom lens includes a negative optical power compensation lens group S1 and a positive optical power zoom lens group S2. The positive optical power zoom lens group S2 is mainly responsible for changing the equivalent focal length of the optical system and is the "power source" for zooming. The negative optical power compensation lens group S1, through precise linkage movement, cancels the image plane drift caused by the movement of the zoom lens group S2 in real time, and the compensation curve for image plane drift is smoother, with less image plane jump across the entire focal length. Thus, frequent large-scale focusing is not required during zooming, resulting in smoother continuous zooming and ensuring image plane stability across the entire focal length. Furthermore, the converging characteristics of the positive optical power zoom lens group S2 and the diverging characteristics of the negative optical power compensation lens group S1 work together to shorten the overall optical length of the zoom lens, resulting in a smaller volume at the same zoom ratio. At the same time, the optical power of the compensation lens group S1 is opposite to that of the zoom lens group S2, thus ensuring higher zoom sensitivity of the zoom lens. A smaller amount of movement can achieve a larger focal length change, making it easier to achieve high-magnification continuous zoom.

[0023] Furthermore, the compensation lens group S1 includes three lenses with optical power: a first lens 101, a second lens 102, and a third lens 103. The first lens 101 and the second lens 102 both have negative optical power, while the third lens 103 has positive optical power. This negative-negative-positive optical power arrangement of the three lenses in the compensation lens group S1 ensures, on the one hand, the negative optical power setting of the compensation lens group S1. On the other hand, the first lens 101 and the second lens 102, as the first lenses in the zoom lens to adjust the incident light, have a larger aperture before the light enters the aperture stop. This allows off-axis light to enter the third lens 103 at a smaller angle, increasing the aperture of the zoom lens and enabling clear imaging even in dim or dark conditions. Furthermore, both the first lens 101 and the second lens 102 have negative optical power. The two lenses can share the optical power, preventing all the negative optical power from being concentrated on a single lens. This ensures a smoother curvature for both lenses, simplifying their manufacturing process and allowing for more relaxed tolerances. The third lens 103 is a positive optical power lens. This configuration allows for timely correction of significant aberrations produced by the first lens 101 and the second lens 102, particularly noticeable in correcting edge aberrations in zoom lenses, thereby improving the imaging resolution of the optical system. In summary, the overall negative optical power compensation lens group S1, consisting of a first lens 101 with negative optical power, a second lens 102 with negative optical power, and a third lens 103 with positive optical power, can effectively compensate for image plane displacement during zooming. At the same time, it can achieve good correction of aberrations such as chromatic aberration, spherical aberration, and field curvature through reasonable distribution of positive and negative optical power. This reduces the optical power burden of individual lenses, improves the tolerance of processing and assembly, and is conducive to realizing a zoom optical system with high zoom ratio, miniaturization, and high imaging quality.

[0024] The zoom lens group S2 comprises eight lenses with optical power: the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, the eighth lens 108, the ninth lens 109, the tenth lens 110, and the eleventh lens 111. Lenses 104, 105, 106, 108, and 110 are designed with positive optical power, while lenses 107, 109, and 111 are designed with negative optical power. The combination of five positive optical power lenses and three negative optical power lenses in the zoom lens group S2 ensures the positive optical power setting of the zoom lens group S2. Furthermore, the positive optical power design of the fourth lens 104 combined with the third lens 103 is beneficial for achieving the large aperture performance of the zoom lens. Furthermore, the arrangement of multiple positive power lenses in the zoom lens group S2 distributes the total positive power across multiple positive power lenses. This results in smaller individual lens powers and gentler curvatures, ensuring more relaxed tolerances in lens manufacturing and assembly, thereby guaranteeing high production yield and controllable costs. Moreover, the power configuration of the sixth lens 106 to the eleventh lens 111 in the zoom lens group S2 is positive-negative-positive-negative-positive-negative. This multi-level positive and negative power configuration significantly reduces axial and transverse chromatic aberration, which is beneficial for achieving high-resolution, large-aperture, and high zoom ratio optical systems. In summary, the S2 zoom lens group adopts positive optical power as a whole and is composed of multiple positive optical power lenses and multiple negative optical power lenses. While realizing the zoom function of the system, it can effectively correct various aberrations such as chromatic aberration, spherical aberration, field curvature, and distortion through the reasonable distribution and alternating arrangement of positive and negative optical power. It also reduces the optical sensitivity of individual lenses, improves the tolerance of processing and assembly, and is conducive to realizing a zoom optical system with high zoom ratio, large relative aperture, miniaturization, and high imaging quality.

[0025] Further reference Figure 1 and Figure 2 As shown, the zoom lens also includes an aperture stop STO and a filter 112; the aperture stop STO is disposed in the optical path between the compensation lens group S1 and the zoom lens group S2; the filter 112 is disposed in the optical path between the zoom lens group S2 and the image plane.

[0026] Specifically, by setting the aperture stop STO, the propagation direction of the light beam can be adjusted, which is beneficial to improving image quality. Furthermore, in this zoom lens, the aperture stop STO can be located in the optical path between the compensation lens group S1 and the zoom lens group S2, that is, in the optical path between the third lens 103 and the fourth lens 104. The purpose is to control the higher aberrations of the lens at the front end of the lens, ensuring good image quality while improving image height and expanding the target area at the rear end of the lens. Further, the filter 112 is located in the optical path between the zoom lens group S2 and the image plane, that is, in the optical path between the eleventh lens 111 and the image plane. The filter 112 can filter out interference light, improving the imaging effect of the zoom lens. Further, the zoom lens provided in this embodiment of the invention may also include a protective glass and an imaging sensor. The protective glass can be located on the image side of the filter, and the imaging sensor can be located on the image side of the protective glass. The protective glass protects the optical system, and the imaging sensor acquires images, enabling the optical system to perform its normal imaging function.

[0027] In summary, the zoom lens provided by the embodiments of the present invention, by reasonably setting the optical power of the compensation lens group and the zoom lens group, and further limiting the number of lenses included in the compensation lens group and the optical power matching method of the lenses, and the number of lenses included in the zoom lens group and the optical power matching method of the lenses, effectively expands the imaging target area while achieving a compact structure, small size, and strictly controlling the total optical length within 51mm, and simultaneously achieves large aperture performance. Furthermore, it can effectively correct various aberrations such as chromatic aberration, spherical aberration, field curvature, and distortion, reduce the optical sensitivity of individual lenses, and improve the tolerance of processing and assembly tolerances, which is conducive to realizing a zoom optical system with high zoom ratio, large relative aperture, miniaturization, and high imaging quality.

[0028] Based on the above embodiments, the focal length of the first lens 101 is f1, the focal length of the second lens 102 is f2, the combined focal length of the first lens 101 and the second lens 102 is f12, the focal length of the eighth lens 108 is f8, the focal length of the ninth lens 109 is f9, the focal length of the tenth lens 110 is f10, the focal length of the compensation lens group is Z1, and the focal length of the zoom lens group is Z2; wherein, 1.16≤f1 / Z1≤1.32; 1.5≤f2 / Z1≤1.82; 0.58≤f12 / Z1≤0.62; 1.05≤f8 / Z2≤1.15; -1.25≤f9 / Z2≤-1.08; 0.8≤f10 / Z2≤1.15. The first lens 101 and the second lens 102 encompass the negative optical power of the compensating lens group S1 in the zoom lens, allowing off-axis light rays to enter the third lens 103 at a smaller angle. Furthermore, by rationally distributing the optical power of each lens in the zoom lens group S2, it is ensured that light propagates smoothly without excessive refraction on any surface, thus preventing the introduction of greater aberrations and guaranteeing good image quality of the zoom lens.

[0029] Based on the above embodiments, the first lens 101 includes a first object-side surface near the object plane and a first image-side surface near the image plane, the first object-side surface being convex and the first image-side surface being concave; the second lens 02 includes a second object-side surface near the object plane and a second image-side surface near the image plane, the second object-side surface being concave and the second image-side surface being concave; the third lens 03 includes a third object-side surface near the object plane and a third image-side surface near the image plane, the third object-side surface being convex and the third image-side surface being convex; the fourth lens 04 includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane, the fourth object-side surface being convex and the fourth image-side surface being convex; the fifth lens 105 includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane, the fifth object-side surface being concave and the fifth image-side surface being convex; the sixth lens 106 includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth image side and the sixth object side are both convex. The seventh lens 107 includes a seventh object side near the object plane and a seventh image side near the image plane. The seventh object side and the seventh image side are both concave. The eighth lens 108 includes an eighth object side near the object plane and an eighth image side near the image plane. The eighth object side and the eighth image side are both convex. The ninth lens 109 includes a ninth object side near the object plane and a ninth image side near the image plane. The ninth object side and the ninth image side are both concave or convex. The tenth lens 110 includes a tenth object side near the object plane and a tenth image side near the image plane. The tenth object side and the tenth image side are both convex. The eleventh lens 111 includes an eleventh object side near the object plane and an eleventh image side near the image plane. The eleventh object side and the eleventh image side are both convex.

[0030] Specifically, the object-side surface of a lens can be understood as the surface of the lens closest to the object plane, and the image-side surface of a lens can be understood as the surface of the lens closest to the image plane.

[0031] The first object-side surface is convex, and the first image-side surface is concave. That is, the object-side surface of the first lens 101 is convex towards the object surface near the optical axis, and the image-side surface is concave towards the image surface near the optical axis. In other words, the first lens 101 is a lens with a convex-concave structure.

[0032] The second object-side surface is concave, and the second image-side surface is concave. That is, the object-side surface of the second lens 102 is concave towards the object surface at the position near the optical axis, and the image-side surface is concave towards the image surface at the position near the optical axis. In other words, the second lens 102 is a lens with a double concave structure.

[0033] The third object-side surface is convex, and the third image-side surface is convex. That is, the object-side surface of the third lens 103 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the third lens 103 is a lens with a biconvex structure.

[0034] The fourth object-side surface is convex, and the fourth image-side surface is also convex. That is, the object-side surface of the fourth lens 104 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the fourth lens 104 is a lens with a biconvex structure.

[0035] The fifth object-side surface is concave, and the fifth image-side surface is convex. That is, the object-side surface of the fifth lens 105 is concave towards the object surface at the position near the optical axis, and the image-side surface is convex towards the image surface at the position near the optical axis. In other words, the fifth lens 105 is a lens with a concave-convex structure.

[0036] The sixth object-side surface is convex, and the sixth image-side surface is also convex. That is, the object-side surface of the sixth lens 106 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the sixth lens 106 is a lens with a biconvex structure.

[0037] The seventh object-side surface is concave, and the seventh image-side surface is also concave. That is, the object-side surface of the seventh lens 107 is concave towards the object surface near the optical axis, and the image-side surface is concave towards the image surface near the optical axis. In other words, the seventh lens 107 is a lens with a double concave structure.

[0038] The eighth image side is convex, meaning that the object side of the eighth lens 108 convexes towards the object plane near the optical axis, and the image side convexes towards the image plane near the optical axis. In other words, the eighth lens 108 is a biconvex lens.

[0039] The ninth object-side surface is concave, and the ninth image-side surface is either concave or convex. That is, the object-side surface of the ninth lens 109 is concave towards the object surface at the position near the optical axis, and the image-side surface is concave or convex towards the image surface at the position near the optical axis. In other words, the ninth lens 109 is a lens with a double concave structure or a concave-convex structure.

[0040] The tenth object-side surface is convex, and the tenth image-side surface is also convex. That is, the object-side surface of the tenth lens 110 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the tenth lens 110 is a lens with a biconvex structure.

[0041] The eleventh object-side surface is convex, and the eleventh image-side surface is concave. That is, the object-side surface of the eleventh lens 111 is convex towards the object surface near the optical axis, and the image-side surface is concave towards the image surface near the optical axis. In other words, the eleventh lens 111 is a lens with a convex-concave structure.

[0042] By designing the surface shape of each lens and combining the optical power of each lens, the imaging effect of the zoom lens and the overall size of the optical lens can be further adjusted.

[0043] Based on the above embodiment, the displacement of the zoom lens group S2 from the wide-angle end to the telephoto end is D1, and the total length of the zoom lens at the wide-angle end is TTL_W; where 0.11≤D1 / TTL_W≤0.115. By limiting the ratio of the movement distance of the zoom lens group S2 from the wide-angle end to the telephoto end to the total length at the wide-angle end, the physical size of the entire optical system can be minimized while ensuring that the zoom lens has a sufficient zoom range. This is one of the core technical means to achieve miniaturization design of zoom lenses.

[0044] Based on the above embodiments, 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 0.18≤BFL / TTL_W≤0.21. While achieving miniaturization, the large back focal ratio provides ample space for the rear structure design of the zoom lens, which is beneficial for zoom lens assembly, improves production yield, and reduces costs.

[0045] Based on the above embodiments, 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; where ID1 / TTL_W≤0.18. By satisfying these characteristics, the zoom lens can be made small while still capturing a larger image, achieving the goal of a small size while adapting to a large-area chip.

[0046] Based on the above embodiment, the sixth lens 106 and the seventh lens 107 are cemented together.

[0047] Specifically, the cemented joint of the sixth lens 106 and the seventh lens 107 can be understood as the surface of the sixth lens 106 near the image plane being bonded to the surface of the seventh lens 107 near the object plane; that is, the image-side surface of the sixth lens 106 and the object-side surface of the seventh lens 107 are bonded together. By cementing the sixth lens 106 and the seventh lens 107, the air gap between them can be reduced, which helps to reduce the overall optical length of the lens. It also reduces tolerance sensitivity issues such as tilting / eccentricity during lens assembly, simplifies the assembly process in lens manufacturing, and improves equipment efficiency. Simultaneously, the cemented joint of the sixth lens 106 and the seventh lens 107 can also reduce light loss caused by reflections between the lenses, improve illumination, and significantly suppress ghosting and flare, especially in high-contrast environments such as backlighting, resulting in cleaner, higher-contrast images. Furthermore, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in zoom lenses can improve image quality and reduce light energy reflection loss, thereby improving image quality and enhancing the sharpness of the lens image. Furthermore, the cementing arrangement between the sixth lens 106 and the seventh lens 107 can be achieved through a spacer or by adhesive bonding; this embodiment of the invention does not limit the specific bonding method.

[0048] Based on the above embodiment, the combined focal length of the sixth lens 106 and the seventh lens 107 is f67, and the focal length of the zoom lens group S2 is Z2, where -4≤F67 / Z2≤-1.6; the refractive index of the sixth lens 106 is ND6, and the Abbe number is VD6; the refractive index of the seventh lens 107 is ND7, and the Abbe number is VD7; where 1.52≤Nd6≤1.58; 1.75≤Nd7≤1.87; 17≤|v6-v7|≤60. Specific Abbe number difference and refractive index range constraints are applied to the cemented lens composed of the sixth lens 106 and the seventh lens 107, and the ratio between their combined focal length and the focal length of the zoom lens group S2 is limited. This aims to utilize the complementary chromatic aberration effect of positive and negative optical powers to effectively suppress chromatic aberration generated within the optical system and balance the residual chromatic aberration introduced by other lens groups, ultimately improving the overall image sharpness and color reproduction capability of the zoom lens.

[0049] Based on the above embodiments, the refractive index of the first lens 101 is ND1, the refractive index of the fourth lens 104 is ND4, and the refractive index of the fifth lens 105 is ND5; wherein, 1.55≤Nd1≤1.75; 1.45≤Nd4≤1.72; 1.52≤Nd5≤1.75.

[0050] Specifically, setting the refractive index of the first lens 101 in the range of 1.55-1.75 can effectively reduce the surface curvature of the first lens 101 while ensuring its negative optical power, thereby reducing the sensitivity to aberrations such as spherical aberration and coma and improving imaging stability. At the same time, it takes into account the availability of optical glass materials, processing performance and mass production cost, which is conducive to achieving miniaturization, high imaging quality and high yield of zoom lenses.

[0051] By placing the aperture stop STO between the third lens 103 and the fourth lens 104, and limiting the refractive index of the fourth lens 104, the generation of coma and other off-axis aberrations can be effectively suppressed. The combined effect of a reasonable aperture stop STO position and material selection reduces aberrations caused by changes in the incident angle when light passes through the aperture stop STO, thereby improving the imaging quality of the edge field of view.

[0052] Setting the refractive index of the fifth lens 105 in the range of 1.52-1.75 can effectively reduce the curvature of the lens surface, reduce the sensitivity to aberrations such as spherical aberration and coma, and achieve good chromatic aberration correction in conjunction with adjacent lenses, while ensuring its positive optical power.

[0053] Based on the above embodiments, the first lens 101, the fourth lens 104, the sixth lens 106 and the seventh lens 107 are all glass spherical lenses; the second lens 102, the third lens 103, the fifth lens 105, the eighth lens 108, the ninth lens 109, the tenth lens 110 and the eleventh lens 111 are all plastic aspherical lenses.

[0054] Specifically, spherical lenses are characterized by a constant curvature from the center to the periphery, ensuring a simple lens setup. Furthermore, due to the low coefficient of thermal expansion and good stability of glass lenses, the first lens 101, fourth lens 104, sixth lens 106, and seventh lens 107 can all be glass spherical lenses. The thermal properties of glass spherical lenses are more stable, ensuring good resolving power over a wide temperature range when handling higher optical powers. In addition, compared to plastic aspherical lenses, glass offers a wider range of material choices, with more freedom in selecting refractive index and Abbe number. This allows for better control over higher aberrations and chromatic aberrations, meeting the needs of use under complex conditions.

[0055] Aspherical lenses are characterized by a continuous change in curvature from the center to the periphery, unlike spherical lenses which have a constant curvature from the center to the periphery. Aspherical lenses possess superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. Furthermore, due to the relatively low price of plastic, using plastic aspherical lenses helps reduce production costs and improve efficiency. Therefore, the second lens 102, third lens 103, fifth lens 105, eighth lens 108, ninth lens 109, tenth lens 110, and eleventh lens 111 are all plastic aspherical lenses. This eliminates spherical aberration, corrects coma, astigmatism, corrects off-axis aberration, corrects distortion, improves edge image quality, and maintains consistent high definition from the center to the edges of the image, while also reducing costs.

[0056] In summary, by combining different lens materials—using lower-cost, lighter plastic for some lenses and glass for critical areas—this approach not only significantly reduces the overall manufacturing cost and weight of the lens, but also helps maintain the lens's imaging stability in high and low temperature environments by utilizing the differences in the thermal expansion coefficients of different materials, thus mitigating resolution fluctuations caused by temperature changes.

[0057] Furthermore, in this embodiment of the invention, the aspherical lens of the zoom optical system satisfies the following formula: Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis at a height r along the optical axis; c represents the curvature at the vertex of the aspherical surface; a2, a3, a4, a5, a6, a7, and a8 are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order higher-order aspherical coefficients corresponding to the aspherical surface. These can be combined to form higher-order terms for the corresponding aspherical surfaces.

[0058] As one implementation method, the parameters of each lens in the zoom lens will be explained below.

[0059] Table 1. Optical design values ​​for the zoom lens in Example 1 Table 2 Design values ​​of optical physical parameters for a zoom lens Table 3. Zoom intervals at the wide-angle and telephoto ends of a zoom optical system. The surface numbers in Table 2 above are numbered according to the surface order of each lens. For example, surface number "S1" represents the object-side surface of the first lens, surface number "S2" represents the image-side surface of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object surface with the center closer to the image surface, and a negative value means that the surface bends towards the image surface with the center closer to the object surface. "Infinity" means that the surface is flat and the radius of curvature is infinite. The thickness represents the central axial distance between the current surface and 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. A blank space means 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. A blank space means that the current position is air. The variable spacing in Table 3 represents the different spacing values ​​of the lens at the wide-angle end and the telephoto end.

[0060] Table 4 below shows the aspheric coefficient values ​​used in the current embodiment; Table 5 shows some specific parameters implemented in this embodiment.

[0061] Table 4 Design values ​​of aspherical conic coefficient in a zoom lens "-3.258854E-04" means -3.258854 × 10 -4 All other coefficients are represented in this way.

[0062] Table 5 Specific parameters for this embodiment Furthermore, Figure 3 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of axial aberration at the telephoto end of the zoom lens provided in Embodiment 1 of the present invention. As shown in the figure, the vertical direction represents the normalized aperture size, 0 represents the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546nm, and the horizontal coordinate values ​​represent the offset of the light rays relative to the image plane, in millimeters. Figure 3 and Figure 4 As can be seen, the spherical aberration of the zoom lens at different wavelengths (435nm, 486nm, 546nm, 588nm and 656nm) is within 0.05mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is very small. Therefore, it can be concluded that the zoom lens can correct aberrations well.

[0063] Figure 5 This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 6 This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention. The horizontal axis of the ray fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the principal ray on the image plane. It should be noted that the principal ray is the ray that passes through the center of the entrance pupil; ideally, each curve completely coincides with the horizontal axis, at which point all rays in the field of view converge at the same point on the image plane. Figure 5 and Figure 6 As shown, the light fan plots of all fields of view at different wavelengths (435nm, 486nm, 546nm, 588nm and 656nm) are all close to the horizontal axis, and the curves of each color have a high degree of concentration. This indicates that the aberrations of each field of view of the zoom lens are well corrected, which can ensure that the zoom lens can form clear images in a wide spectral range.

[0064] Figure 7 This is a field curvature distortion diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 8 This is a field curvature distortion diagram of the zoom lens at the telephoto end provided in Embodiment 1 of the present invention, as shown below. Figure 7 and Figure 8 As shown, the figure has two coordinate systems. In the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinate represents the normalized image height, which has no unit. T represents the meridion, and S represents the sagitta. Figure 7 , Figure 8 As can be seen from the left coordinate system, the zoom lens provided in Example 1 effectively controls the field curvature at different wavelengths, ensuring minimal difference in image quality between the center and periphery during imaging. In the right coordinate system, the horizontal axis represents the magnitude of distortion (%), and the vertical axis represents the normalized image height (unitless). Figure 8 As can be seen from the coordinate system on the right, the distortion of the zoom lens provided in Embodiment 1 of this application has been effectively controlled at the telephoto end.

[0065] In summary, the zoom lens provided in Embodiment 1 of the present invention can achieve miniaturization, low cost and large aperture design, and has the characteristics of large target surface and excellent high and low temperature performance. At the same time, the field of view at the wide-angle end exceeds 140°, which can achieve ultra-wide range imaging.

[0066] Example 2 Figure 9 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention. Figure 10 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, as shown below. Figure 9 and Figure 10 As shown, the zoom lens provided in Embodiment 2 of the present invention includes a compensation lens group S1, an aperture stop STO, and a zoom lens group S2 arranged sequentially along the optical axis from the object plane to the image plane; both the compensation lens group S1 and the zoom lens group S2 can be moved along the optical axis; the optical power of the compensation lens group S1 is negative, and the compensation lens group S2 includes a first lens 101, a second lens 102, and a third lens 103; the optical power of the zoom lens group S2 is positive, and the zoom lens group includes a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, and an eleventh lens 111; the first lens 101, the second lens 102, the seventh lens 107, the ninth lens 109, and the eleventh lens 111 are all negative optical power lenses, and the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the eighth lens 108, and the tenth lens 110 are all positive optical power lenses.

[0067] The lens setup is the same as in Embodiment 1, and will not be repeated here.

[0068] As another feasible implementation method, the specific parameters of the zoom lens are explained below.

[0069] Table 6. Optical design values ​​for the zoom lens in Example 2 Table 7 Design values ​​of optical physical parameters for a zoom lens Table 8. Zoom intervals at the wide-angle and telephoto ends of a zoom optical system. The surface numbers in Table 7 above are assigned according to the surface order of each lens. For example, surface number "S1" represents the object-side surface of the first lens, surface number "S2" represents the image-side surface of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the curvature of the lens surface. A positive value means that the surface bends towards the object surface with the center closer to the image surface, and a negative value means that the surface bends towards the image surface with the center closer to the object surface. "Infinity" means that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance between the current surface and 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. A blank space indicates that the current position is air and the refractive index is 1. The material (vd) represents the Abbe number, that is, the dispersion characteristic of the material between the current surface and the next surface to light. A blank space indicates that the current position is air. The variable spacing in Table 8 represents the different spacing values ​​of the lens at the wide-angle end and the telephoto end.

[0070] Table 9 below shows the aspheric coefficient values ​​used in the current embodiment; Table 10 shows some specific parameters implemented in this embodiment.

[0071] Table 9 Design values ​​of aspherical conic coefficient in a zoom lens "-4.142917E-04" means -4.142917 × 10 -4 All other coefficients are represented in this way.

[0072] Table 10 Specific parameters for this embodiment Furthermore, Figure 11 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 2 of the present invention. Figure 12 This is a schematic diagram of axial aberration at the telephoto end of the zoom lens provided in Embodiment 2 of the present invention. As shown in the figure, the vertical direction represents the normalized aperture size, 0 represents the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546nm, and the horizontal coordinate values ​​represent the offset of the light rays relative to the image plane, in millimeters. Figure 11 and Figure 12 As can be seen, the spherical aberration of the zoom lens at different wavelengths (435nm, 486nm, 546nm, 588nm and 656nm) is within 0.05mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is very small. Therefore, it can be concluded that the zoom lens can correct aberrations well.

[0073] Figure 13 This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention. Figure 14This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention. The horizontal axis of the ray fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the principal ray on the image plane. It should be noted that the principal ray is the ray that passes through the center of the entrance pupil; ideally, each curve completely coincides with the horizontal axis, at which point all rays in the field of view converge at the same point on the image plane. Figure 13 and Figure 14 As shown, the light fan plots of all fields of view at different wavelengths (435nm, 486nm, 546nm, 588nm and 656nm) are all close to the horizontal axis, and the curves of each color have a high degree of concentration. This indicates that the aberrations of each field of view of the zoom lens are well corrected, which can ensure that the zoom lens can form clear images in a wide spectral range.

[0074] Figure 15 This is a field curvature distortion diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of the present invention. Figure 16 This is a field curvature distortion diagram of the zoom lens at the telephoto end provided in Embodiment 2 of the present invention, as shown below. Figure 15 and Figure 16 As shown, the figure has two coordinate systems. In the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinate represents the normalized image height, which has no unit. T represents the meridion, and S represents the sagitta. Figure 15 , Figure 16 As can be seen from the left coordinate system, the zoom lens provided in Example 2 effectively controls the field curvature at different wavelengths, ensuring minimal difference in image quality between the center and periphery during imaging. In the right coordinate system, the horizontal axis represents the magnitude of distortion (%), and the vertical axis represents the normalized image height (unitless). Figure 16 As can be seen from the coordinate system on the right, the distortion of the zoom lens provided in Embodiment 2 of this application is effectively controlled at the telephoto end.

[0075] In summary, the zoom lens provided in Embodiment 2 of the present invention can achieve miniaturization, low cost and large aperture design, and has the characteristics of large target surface and excellent high and low temperature performance. At the same time, the field of view at the wide-angle end exceeds 140°, which can achieve ultra-wide range imaging.

[0076] Example 3 Figure 17 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention. Figure 18 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, as shown below. Figure 17 and Figure 18As shown, the zoom lens provided in Embodiment 3 of the present invention includes a compensation lens group S1, an aperture stop STO, and a zoom lens group S2 arranged sequentially along the optical axis from the object plane to the image plane; both the compensation lens group S1 and the zoom lens group S2 can be moved along the optical axis; the optical power of the compensation lens group S1 is negative, and the compensation lens group S2 includes a first lens 101, a second lens 102, and a third lens 103; the optical power of the zoom lens group S2 is positive, and the zoom lens group includes a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, and an eleventh lens 111; the first lens 101, the second lens 102, the seventh lens 107, the ninth lens 109, and the eleventh lens 111 are all negative optical power lenses, and the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the eighth lens 108, and the tenth lens 110 are all positive optical power lenses.

[0077] The lens setup is the same as in Embodiment 1, and will not be repeated here.

[0078] As another feasible implementation method, the specific parameters of the zoom lens are explained below.

[0079] Table 11. Optical design values ​​for the zoom lens in Example 3 Table 12 Design values ​​of optical physical parameters for a zoom lens Table 13 Zoom intervals at the wide-angle and telephoto ends of a zoom optical system The surface numbers in Table 12 above are numbered according to the surface order of each lens. For example, surface number "S1" represents the object-side surface of the first lens, surface number "S2" represents the image-side surface of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the lens surface. A positive value means that the surface bends towards the object surface with the center closer to the image surface, and a negative value means that the surface bends towards the image surface with the center closer to the object surface. "Infinity" means that the surface is flat and the radius of curvature is infinite. The thickness represents the central axial distance between the current surface and 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. A blank space means 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. A blank space means that the current position is air. The variable spacing in Table 13 represents the different spacing values ​​of the lens at the wide-angle end and the telephoto end.

[0080] Table 14 below shows the aspheric coefficient values ​​used in the current embodiment; Table 15 shows some specific parameters implemented in this embodiment.

[0081] Table 14 Design values ​​of aspherical conic coefficient in a zoom lens "-3.787361E-04" means -3.787361 × 10 -4 All other coefficients are represented in this way.

[0082] Table 15 Specific parameters for this embodiment Furthermore, Figure 19 This is a schematic diagram of axial aberration at the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention. Figure 20 This is a schematic diagram of axial aberration at the telephoto end of the zoom lens provided in Embodiment 3 of the present invention. As shown in the figure, the vertical direction represents the normalized aperture size, 0 indicates that it is on the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546nm, and the horizontal coordinate values ​​represent the offset of the light rays relative to the image plane, in millimeters. Figure 19 and Figure 20 As can be seen, the spherical aberration of the zoom lens at different wavelengths (435nm, 486nm, 546nm, 588nm and 656nm) is within 0.05mm. The curves of different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is very small. Therefore, it can be concluded that the zoom lens can correct aberrations well.

[0083] Figure 21 This is the ray fan pattern of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention. Figure 22 This is a ray fan diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention. The horizontal axis of the ray fan diagram represents the normalized pupil aperture, and the vertical axis represents the distance of the corresponding ray from the principal ray on the image plane. It should be noted that the principal ray is the ray that passes through the center of the entrance pupil; ideally, each curve completely coincides with the horizontal axis, at which point all rays in the field of view converge at the same point on the image plane. Figure 21 and Figure 22 As shown, the light fan plots of all fields of view at different wavelengths (435nm, 486nm, 546nm, 588nm and 656nm) are all close to the horizontal axis, and the curves of each color have a high degree of concentration. This indicates that the aberrations of each field of view of the zoom lens are well corrected, which can ensure that the zoom lens can form clear images in a wide spectral range.

[0084] Figure 23 This is a field curvature distortion diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of the present invention. Figure 24This is a field curvature distortion diagram of the zoom lens at the telephoto end provided in Embodiment 3 of the present invention, as shown below. Figure 23 and Figure 24 As shown, the figure has two coordinate systems. In the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinate represents the normalized image height, which has no unit. T represents the meridion, and S represents the sagitta. Figure 23 , Figure 24 As can be seen from the left coordinate system, the zoom lens provided in Example 3 effectively controls the field curvature at different wavelengths, ensuring minimal difference in image quality between the center and periphery during imaging. In the right coordinate system, the horizontal axis represents the magnitude of distortion (%), and the vertical axis represents the normalized image height (unitless). Figure 24 As can be seen from the coordinate system on the right, the distortion of the zoom lens provided in Embodiment 3 of this application has been effectively controlled at the telephoto end.

[0085] In summary, the zoom lens provided in Embodiment 3 of the present invention can achieve miniaturization, low cost and large aperture design, and has the characteristics of large target surface and excellent high and low temperature performance. At the same time, the field of view at the wide-angle end exceeds 140°, which can achieve ultra-wide range imaging.

[0086] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. 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 modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A zoom lens, characterized in that, It includes a compensation lens group, an aperture stop, and a zoom lens group arranged sequentially along the optical axis from the object plane to the image plane, wherein both the compensation lens group and the zoom lens group can be moved along the optical axis; The optical power of the compensation lens group is negative, and the compensation lens group includes a first lens, a second lens, and a third lens; The optical power of the zoom lens group is positive, and the zoom lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens. The first lens, the second lens, the seventh lens, the ninth lens, and the eleventh lens are all negative power lenses, while the third lens, the fourth lens, the fifth lens, the sixth lens, the eighth lens, and the tenth lens are all positive power lenses.

2. The zoom lens according to claim 1, characterized in that, The focal length of the first lens is f1, the focal length of the second lens is f2, the combined focal length of the first and second lenses is f12, the focal length of the eighth lens is f8, the focal length of the ninth lens is f9, the focal length of the tenth lens is f10, the focal length of the compensation lens group is Z1, and the focal length of the zoom lens group is Z2. Wherein, 1.16≤f1 / Z1≤1.32; 1.5≤f2 / Z1≤1.82; 0.58≤f12 / Z1≤0.62; 1.05≤f8 / Z2≤1.15;-1.25≤f9 / Z2≤-1.08;0.8≤f10 / Z2≤1.15; 3. The zoom lens according to claim 1, characterized in that, The first lens includes a first object-side surface near the object plane and a first image-side surface near the image plane. The first object-side surface is convex, and the first image-side surface is concave. The second lens includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface and the second image-side surface are concave. The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is convex. The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is convex, and the fourth image-side surface is convex. The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is concave, and the fifth image-side surface is convex. The sixth lens includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth object-side surface is convex, and the sixth image-side surface is convex. The seventh lens includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane. The seventh object-side surface is concave, and the seventh image-side surface is concave. The eighth lens includes an eighth object-side surface near the object plane and an eighth image-side surface near the image plane. The eighth object-side surface is convex, and the eighth image-side surface is convex. The ninth lens includes a ninth object-side surface near the object plane and a ninth image-side surface near the image plane. The ninth object-side surface is concave, and the ninth image-side surface is either concave or convex. The tenth lens includes a tenth object-side surface near the object plane and a tenth image-side surface near the image plane. The tenth object-side surface is convex, and the tenth image-side surface is convex. The eleventh lens includes an eleventh object-side surface near the object plane and an eleventh image-side surface near the image plane. The eleventh object-side surface is convex, and the eleventh image-side surface is concave.

4. The zoom lens according to claim 1, characterized in that, The displacement of the zoom lens group from the wide-angle end to the telephoto end is D1, and the total length of the zoom lens at the wide-angle end is TTL_W; Where 0.11≤D1 / TTL_W≤0.

115.

5. The zoom lens according to claim 1, characterized in that, The zoom lens has a back focal length of BFL at the telephoto end and a total length of TTL_W at the wide-angle end. Wherein, 0.18≤BFL / TTL_W≤0.

21.

6. The zoom lens according to claim 1, characterized in that, 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; Where: ID1 / TTL_W≤0.

18.

7. The zoom lens according to claim 1, characterized in that, The sixth lens and the seventh lens are cemented together.

8. The zoom lens according to claim 7, characterized in that, The combined focal length of the sixth lens and the seventh lens is f67, and the focal length of the zoom lens group is Z2, wherein -4≤F67 / Z2≤-1.6; The refractive index of the sixth lens is ND6 and the Abbe number is VD6; the refractive index of the seventh lens is ND7 and the Abbe number is VD7; wherein, 1.52≤Nd6≤1.58; 1.75≤Nd7≤1.87; 17≤|v6-v7|≤60.

9. The zoom lens according to claim 1, characterized in that, The first lens has a refractive index of ND1, the fourth lens has a refractive index of ND4, and the fifth lens has a refractive index of ND5. Among them, 1.55≤Nd1≤1.75; 1.45≤Nd4≤1.72; 1.52≤Nd5≤1.

75.

10. The zoom lens according to claim 1, characterized in that, 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, the tenth lens, and the eleventh lens are all plastic aspherical lenses.

Images