A zoom lens
By using fewer glass and plastic lenses in the zoom lens, combined with the design of focus groups, fixed groups and zoom groups, the cost and weight problems caused by the large number of lenses in the prior art are solved, and high The performance of day and night confocal zoom lens meets the needs of low-cost and efficient imaging.
Patent Information
- Application Number
- CN202010489488.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-06-02
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-06-02
AI Technical Summary
Existing zoom lenses require more glass spherical lenses and aspherical lenses when achieving high-performance imaging, resulting in increased production difficulty, expensive and heavier weight, and it is impossible to obtain better optical effects under low-cost conditions.
Using fewer glass spherical lenses and aspherical lenses, the diagonal field angle under the 1/1.8-inch CMOS target surface is achieved through the coordination of the focus group, fixed group and variable group, combined with the setting of the aperture. The day and night confocal zoom lens of about 140 degrees to 54 degrees uses a mixture of glass and plastic lenses, and adjusts the zoom function of the group with the aspherical or spherical surface shape to reduce cost and weight.
It realizes a high-performance zoom lens under low-cost conditions, reduces the number and weight of lenses, reduces the difficulty and cost of production, and ensures the confocal effect of visible light and infrared, providing better optical imaging quality.
Smart Images
Figure CN111562662B_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present invention relate to the technical field of optical lenses, and in particular to a zoom lens. Background Art
[0002] Zoom all-in-one cameras are widely used in security fields such as smart transportation and face recognition. There are many types of zoom all-in-one cameras on the market, but if you want to achieve a good imaging effect, you need a combination of more glass spherical lenses or more glass aspherical lenses, which makes the production of zoom all-in-one cameras more difficult, expensive, and heavy. If you want to reduce the cost and minimize the number of glass spherical lenses and glass aspherical lenses, you will not be able to get a good optical effect. Summary of the invention
[0003] The present invention provides a zoom lens, which uses fewer glass spherical lenses and glass aspherical lenses to achieve a high-performance zoom lens with a diagonal field angle ranging from about 140 degrees to 54 degrees and day and night confocality under a 1 / 1.8-inch CMOS target surface.
[0004] An embodiment of the present invention provides a zoom lens, comprising a focus group, a fixed group and a zoom group arranged in sequence from the object side to the image side; the zoom lens further comprises an aperture, and the aperture is arranged in the fixed group; during the zooming process, the fixed group is fixed in position, and the zoom group and the focus group move along the optical axis;
[0005] The focal length of the zoom lens at the wide-angle end is W_F, and the focal lengths of the focusing group, the fixed group, and the variable magnification group are G1_F, G2_F, and G3_F, respectively; and the focal length of each group relative to the zoom lens at the wide-angle end satisfies:
[0006] -0.6 <G1_F / W_F<-0.4;
[0007] 0 <G2_F / W_F<0.1;
[0008] 0.32 <G3_F / W_F<0.42;
[0009] The focusing group includes a first lens, a second lens and a third lens, the fixed group includes a fourth lens, and the zoom group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the adjacent surfaces of the sixth lens and the seventh lens are glued to form a glued lens group; the optical powers of the first lens to the fifth lens are L1_F, L2_F, L3_F, L4_F, L5_F respectively, the optical power of the glued lens group is U_F, and the optical power of each lens relative to the group to which it belongs satisfies the following relationship:
[0010] 0.7 <L1_F / G1_F<0.9;
[0011] 0.35 <L2_F / G1_F<0.7;
[0012] -0.42 <L3_F / G1_F<-0.2;
[0013] L4_F=G2_F;
[0014] 0.8 <L5_F / G3_F<1;
[0015] 0.1 <U_F / G3_F<0.42。
[0016] Optionally, the optical focal powers of the first lens to the tenth lens are negative, negative, positive, positive, positive, negative, positive, positive, positive or negative, positive or negative, respectively.
[0017] Optionally, the focal power L8_F of the eighth lens, the focal power L9_F of the ninth lens and the focal power L10_F of the tenth lens satisfy:
[0018] 0 <L8_F / G3_F<0.5;
[0019] -1 <L9_F / G3_F<-0.4;
[0020] 0 <L10_F / G3_F<0.5。
[0021] Optionally, the focal power relationship between the sixth lens and the seventh lens satisfies: <L6_F / L7_F<-0.7;
[0022] The Abbe number of the first lens is L1_vd, the Abbe number of the fifth lens is L5_vd, the Abbe number of the seventh lens is L7_vd, and the Abbe numbers of the first lens, the fifth lens and the seventh lens satisfy: L1_vd>40, L5_vd>70, L7_vd>60.
[0023] Optionally, a refractive index of the third lens is L3_nd, and the refractive index of the third lens satisfies: L3_nd>1.6.
[0024] Optionally, the refractive index of the first lens is L1_nd, and the refractive index of the first lens satisfies: L1_nd>1.65;
[0025] The maximum aperture of the first lens is S1_DIA, the distance from the front surface vertex of the first lens to the image plane of the zoom lens at the wide-angle end is TTL_W, and the zoom lens satisfies: S1_DIA / TTL_W<0.45.
[0026] Optionally, at the wide-angle end, the distance from the vertex of the rear surface of the ninth lens to the image plane of the zoom lens is BFL_W, and the distance from the vertex of the front surface of the first lens to the image plane is TTL_W, and the zoom lens satisfies: BFL_W / TTL_W>0.1.
[0027] Optionally, the distance moved along the optical axis by the focusing group from the wide-angle end to the telephoto end is G1_L, the distance moved along the optical axis by the zoom group from the wide-angle end to the telephoto end is G3_L, the distance from the front surface vertex of the first lens to the image plane of the zoom lens at the wide-angle end is TTL_W, and the focusing group and the zoom group satisfy: 0.1 <G1_L / TTL_W<0.22,0.05<G3_L / TTL_W<0.15;
[0028] The focal length of the zoom lens at the telephoto end is T_F, and the zoom lens satisfies: 0.43 <T_F / W_F<0.52。
[0029] Optionally, the aperture is arranged between the fourth lens and the third lens or the fifth lens;
[0030] The diameter of the aperture is STO_DIA, the distance from the aperture to the image plane is STO_IMA, the distance from the front surface vertex of the first lens to the image plane at the wide-angle end of the zoom lens is TTL_W, and the zoom lens satisfies: STO_DIA / TTL_W>0.17, 0.5 <STO_IMA / TTL_W<0.6。
[0031] Optionally, the refractive index of the second lens is L2_nd, the refractive index of the third lens is L3_nd, the refractive index of the fourth lens is L4_nd, the refractive index of the eighth lens is L8_nd, and the refractive index of the ninth lens is L9_nd, then each lens satisfies: L2_nd<1.72, L3_nd<1.72, L4_nd<1.72, L8_nd<1.72, L9_nd<1.72.
[0032] Optionally, when the image height of the zoom lens is 4.4 mm, the object field angle FOV_W of the zoom lens at the wide-angle end and the object field angle FOV_T of the zoom lens at the telephoto end satisfy: 130 <FOV_W<145,50<FOV_T<60;
[0033] The zoom lens has a focal length of 0.2 at the wide angle end. <W_F<0.25。
[0034] The zoom lens provided by the embodiment of the present invention is configured with a focusing group, a fixed group, and a zooming group. The optical powers of the focusing group, the fixed group, and the zooming group satisfy -0.6 < G1_F / W_F < -0.4, 0 < G2_F / W_F < 0.1, and 0.32 < G3_F / W_F < 0.42 with respect to the optical power of the zoom lens at the wide-angle end. At the same time, the focusing group is configured with three lenses, the fixed group is configured with one lens, and the zooming group is configured with six lenses. The optical powers between each lens and its corresponding group satisfy 0.7 < L1_F / G1_F < 0.9, 0.35 < L2_F / G1_F < 0.7, -0.42 < L3_F / G1_F < -0.2, L4_F = G2_F, 0.8 < L5_F / G3_F < 1, and 0.1 < U_F / G3_F < 0.42. While the zooming group moves on the optical axis to achieve zooming, the focusing group can move on the optical axis to compensate for aberrations and achieve clear imaging. At the same time, some lenses can be made of plastic material and combined with aspherical or spherical surface shapes to adjust the zoom function or compensation function of the group, which helps to achieve the light weight of the lenses in the zoom lens and reduce costs. The embodiment of the present invention can realize a zoom lens composed of 4 glass lenses and 6 plastic lenses. By reasonably matching the optical power ratios of these 10 lenses and selecting appropriate materials, the manufacturing cost of the zoom lens can be appropriately reduced. While achieving light weight, it can better correct visible light aberrations, ensure the confocal of visible light and infrared, and achieve a high-performance zoom lens with a diagonal field of view ranging from about 140 degrees to 54 degrees and day-night confocal under a 1 / 1.8-inch CMOS target surface. Description of the Drawings
[0035] Figure 1 is a schematic structural diagram of a zoom lens provided by an embodiment of the present invention;
[0036] Figure 2 is Figure 1 the spherical aberration curve graph of the wide-angle end of the zoom lens shown;
[0037] Figure 3 is Figure 1 the spherical aberration curve graph of the telephoto end of the zoom lens shown;
[0038] Figure 4 is Figure 1 the field curvature and distortion curve graph of the wide-angle end of the zoom lens shown;
[0039] Figure 5 is Figure 1 the field curvature and distortion curve graph of the telephoto end of the zoom lens shown;
[0040] Figure 6 is Figure 1A vertical chromatic aberration curve diagram of the zoom lens at the wide-angle end;
[0041] Figure 7 yes Figure 1 A vertical axis chromatic aberration curve diagram of the zoom lens at the telephoto end;
[0042] Figure 8 yes Figure 1 A graph of the color focus shift curve at the wide-angle end of the zoom lens shown;
[0043] Fig. 9 yes Figure 1 A graph of the color focus shift curve at the telephoto end of the zoom lens shown;
[0044] Fig.10 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention;
[0045] Fig.11 yes Fig.10 Spherical aberration curve of the zoom lens at the wide angle end shown;
[0046] Fig.12 yes Fig.10 The spherical aberration curve of the zoom lens at the telephoto end shown;
[0047] Fig.13 yes Fig.10 Field curvature and distortion curves at the wide-angle end of the zoom lens shown;
[0048] Fig.14 yes Fig.10 Field curvature and distortion curves at the telephoto end of the zoom lens shown;
[0049] Fig.15 yes Fig.10 A vertical chromatic aberration curve diagram of the zoom lens at the wide-angle end;
[0050] Fig.16 yes Fig.10 A vertical axis chromatic aberration curve diagram of the zoom lens at the telephoto end;
[0051] Fig.17 yes Fig.10 A graph of the color focus shift curve at the wide-angle end of the zoom lens shown;
[0052] Fig.18 yes Fig.10 A graph of the color focus shift curve at the telephoto end of the zoom lens shown;
[0053] Fig.19 is a structural schematic diagram of another zoom lens provided by an embodiment of the present invention;
[0054] Fig. 20 yes Fig.19 The spherical aberration curve of the zoom lens at the wide angle end is shown;
[0055] Fig.21 yes Fig.19 The spherical aberration curve of the zoom lens at the telephoto end shown;
[0056] Fig. 22 yes Fig.19 Field curvature and distortion curves at the wide-angle end of the zoom lens shown;
[0057] Fig.23 yes Fig.19 Field curvature and distortion curves at the telephoto end of the zoom lens shown;
[0058] Fig.24 yes Fig.19 A vertical chromatic aberration curve diagram of the zoom lens at the wide-angle end;
[0059] Fig.25 yes Fig.19 A vertical axis chromatic aberration curve diagram of the zoom lens at the telephoto end;
[0060] Fig.26 yes Fig.19 A graph of the color focus shift curve at the wide-angle end of the zoom lens shown;
[0061] Fig. 27 yes Fig.19 A graph of the chromatic focal shift curve at the telephoto end of the zoom lens shown. DETAILED DESCRIPTION
[0062] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0063] Figure 1 is a schematic structural diagram of a zoom lens provided by an embodiment of the present invention, with reference to Figure 1 , the zoom lens comprises a focus group 100, a fixed group 200 and a zoom group 300 which are arranged in sequence from the object side to the image side; the zoom lens further comprises an aperture 400 which is arranged in the fixed group 200; during the zooming process, the fixed group 200 is fixed in position, and the zoom group 300 and the focus group 100 move along the optical axis; wherein the focal power of the zoom lens at the wide-angle end is W_F, and the focal powers of the focus group 100, the fixed group 200 and the zoom group 300 are G1_F, G2_F and G3_F respectively; the focal power of each group relative to the zoom lens at the wide-angle end satisfies: -0.6 <G1_F / W_F<-0.4,0<G2_F / W_F<0.1,0.32<G3_F / W_F<0.42;
[0064] The focusing group 100 includes a first lens 1, a second lens 2 and a third lens 3, the fixed group 200 includes a fourth lens 4, and the zoom group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10; the adjacent surfaces of the sixth lens 6 and the seventh lens 7 are glued to form a glued lens group 310; the optical powers of the first lens 1 to the fifth lens 5 are L1_F, L2_F, L3_F, L4_F, L5_F respectively, and the optical power of the glued lens group 310 is U_F, and the optical power of each lens relative to the group to which it belongs satisfies the following relationship: 0.7 <L1_F / G1_F<0.9,0.35<L2_F / G1_F<0.7,-0.42<L3_F / G1_F<-0.2,L4_F=G2_F,0.8<L5_F / G3_F<1,0.1<U_F / G3_F<0.42。
[0065] Among them, it can be understood that the optical power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, which characterizes the ability of the optical system to deflect light rays. The greater the absolute value of the optical power, the stronger the bending ability of the light rays; the smaller the absolute value of the optical power, the weaker the bending ability of the light rays. When the optical power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light rays is divergent. The optical power can be used to characterize a certain refracting surface of a lens (i.e., a surface of the lens), can be used to characterize a certain lens or lens group, and can also be used to characterize a system composed of multiple lenses together (i.e., a group or lens group). In this embodiment, the focusing group 100, the fixed group 200, and the zoom group 300 can be arranged in a lens barrel. The fixed group 200 is fixed in position in the lens barrel, while the focusing group 100 and the zoom group 300 can reciprocate along the optical axis in the lens barrel. Among them, the zoom group 300 adjusts the focal length of the lens by moving to realize the change of the focal length of the zoom lens, and the focusing group 100 is used to compensate for the aberration and the like caused during the movement of the zoom group 300. It can be understood that during the process of the zoom lens realizing zooming by moving the corresponding group, when the focal length is the shortest, the zoom lens is at the wide-angle end, and when the focal length is the longest, the zoom lens is at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical powers, and also has different lengths or shapes. By setting the optical powers of the focusing group 100, the fixed group 200, and the zoom group 300 to satisfy: -0.6 < G1_F / W_F < -0.4, 0 < G2_F / W_F < 0.1, 0.32 < G3_F / W_F < 0.42, the optical powers of the focusing group 100, the fixed group 200, and the zoom group 300 can cooperate with each other, and the focusing group 100 can compensate for the aberration caused during the zooming movement of the zoom group 300, that is, when the zoom group 300 and the focusing group 100 are moved synchronously, the zoom function can be realized while ensuring the clarity of the image in different focal length states.
[0066] In addition, the focusing group 100 is provided with three lenses, the fixed group 200 is provided with one lens, and the zoom group 300 is provided with six lenses. The lenses can be indirectly supported by Mylar sheets or spacer rings. By setting the optical power of each lens and its corresponding group to satisfy: 0.7 < L1_F / G1_F < 0.9, 0.35 < L2_F / G1_F < 0.7, -0.42 < L3_F / G1_F < -0.2, L4_F = G2_F, 0.8 < L5_F / G3_F < 1, 0.1 < U_F / G3_F < 0.42, on the one hand, it is used to define the role of each lens in its corresponding group, ensure the mutual cooperation of the lenses, and achieve zooming and clear imaging; on the other hand, it is also used to ensure that on the basis of the limited optical power of some lenses, plastic materials can be used for preparation, and the aspherical or spherical surface shape can be used to adjust the zoom function or compensation function of the group, which helps to achieve the light weight of the lenses in the zoom lens and reduce the cost.
[0067] The zoom lens provided by the embodiment of the present invention is configured by including a focusing group, a fixed group, and a zoom group, and setting the optical power of the focusing group, the fixed group, and the zoom group to satisfy -0.6 < G1_F / W_F < -0.4, 0 < G2_F / W_F < 0.1, 0.32 < G3_F / W_F < 0.42 with the optical power of the zoom lens at the wide-angle end; at the same time, the focusing group is provided with three lenses, the fixed group is provided with one lens, the zoom group is provided with six lenses, and the optical power between each lens and its corresponding group satisfies 0.7 < L1_F / G1_F < 0.9, 0.35 < L2_F / G1_F < 0.7, -0.42 < L3_F / G1_F < -0.2, L4_F = G2_F, 0.8 < L5_F / G3_F < 1, 0.1 < U_F / G3_F < 0.42. While the zoom group moves on the optical axis to achieve zooming, the focusing group can move on the optical axis to compensate for aberration and achieve clear imaging. At the same time, some lenses can be made of plastic materials, and the aspherical or spherical surface shape can be used to adjust the zoom function or compensation function of the group, which helps to achieve the light weight of the lenses in the zoom lens and reduce the cost. The embodiment of the present invention can realize a zoom lens composed of 4 glass lenses and 6 plastic lenses. By reasonably matching the optical power ratio of these 10 lenses and selecting appropriate materials, the manufacturing cost of the zoom lens can be appropriately reduced. While achieving light weight, it can better correct visible light aberration, ensure the confocal of visible light and infrared, and achieve a high-performance zoom lens with a diagonal field of view ranging from about 140 degrees to 54 degrees and day-night confocal under a 1 / 1.8-inch CMOS target surface.
[0068] On the basis of the above embodiment, the refractive index of the second lens 2 is L2_nd, the refractive index of the third lens 3 is L3_nd, the refractive index of the fourth lens 4 is L4_nd, the refractive index of the eighth lens 8 is L8_nd, and the refractive index of the ninth lens 9 is L9_nd. Optionally, each lens may be arranged to satisfy the following conditions: L2_nd<1.72, L3_nd<1.72, L4_nd<1.72, L8_nd<1.72, and L9_nd<1.72.
[0069] Among them, the refractive index of the lens is set to be lower than 1.72, which is actually to limit the lens material to plastic material. Specifically, the first lens 1, the sixth lens 6 and the seventh lens 7 can be set to be glass spherical lenses; the fifth lens 5 can be a glass aspherical lens; the second lens 2, the third lens 3, the fourth lens 4, the eighth lens 8, the ninth lens 9 and the tenth lens 10 are all plastic aspherical lenses. At this time, some lenses in the zoom lens, including the second lens 2, the third lens 3, the fourth lens 4, the eighth lens 8, the ninth lens 9 and the tenth lens 10, are plastic lenses with a refractive index lower than 1.72, which can reduce the weight of the zoom lens, reduce the difficulty of lens production, and reduce costs. In addition, the plastic lens uses an aspherical lens, which can better correct the aberration formed during imaging. Furthermore, the shape of each lens can be designed according to actual conditions and needs. Optionally, the first lens 1 can be set to be a concave-convex or plano-concave or biconcave glass spherical lens, the second lens 2 can be set to be a biconcave plastic aspherical lens, the third lens 3 can be set to be a concave-convex or concave-plano or biconcave plastic aspherical lens, the fourth lens 4 can be a concave-convex plastic aspherical lens, the fifth lens 5 can be a biconvex glass aspherical lens, and the seventh lens 7 can be a biconvex glass spherical lens. Among them, the eighth lens 8 can be set to be a plastic aspherical positive lens, the ninth lens 9 can be set to be a plastic aspherical negative lens, and the tenth lens 10 can be set to be a plastic aspherical positive lens. Optionally, the optical focal length L8_F of the eighth lens 8, the optical focal length L9_F of the ninth lens 9, and the optical focal length L10_F of the tenth lens 10 can be set to satisfy 0 <L8_F / G3_F<0.5,-1<L9_F / G3_F<-0.4,0<L10_F / G3_F<0.5。
[0070] Specifically, to ensure that the zoom lens has a sufficient zoom ratio and can achieve focus for clear imaging. Let the distance that the focusing group moves along the optical axis from the wide-angle end to the telephoto end be G1_L, the distance that the zooming group moves along the optical axis from the wide-angle end to the telephoto end be G3_L, the distance from the vertex of the front surface of the first lens 1 to the image plane at the wide-angle end of the zoom lens be TTL_W, and the optical power of the zoom lens at the telephoto end be T_F. It can be set that the focusing group 100 and the zooming group 20 satisfy: 0.1 < G1_L / TTL_W < 0.22, 0.05 < G3_L / TTL_W < 0.15; the zoom lens satisfies: 0.43 < T_F / W_F < 0.52.
[0071] In addition, to better correct the chromatic focal shift of infrared light with a wavelength of 850 nm relative to visible light, optionally, on the basis of the above embodiments, the optical power relationship between the sixth lens 6 and the seventh lens 7 can be set to satisfy: -1 < L6_F / L7_F < -0.7; let the Abbe number of the first lens 1 be L1_vd, the Abbe number of the fifth lens 5 be L5_vd, and the Abbe number of the seventh lens be L7_vd. The Abbe numbers of the first lens 1, the fifth lens 5, and the seventh lens 7 satisfy: L1_vd > 40, L5_vd > 70, L7_vd > 60.
[0072] Among them, by respectively limiting the lower limit values of the Abbe numbers of the first lens 1, the fifth lens 5, and the seventh lens 7, the dispersion ability of these lenses can be restricted, ensuring that the dispersion of light with different wavelengths passing through these lenses is low, so as to effectively correct the chromatic focal shift of infrared light with a relatively long wavelength of 850 nm relative to visible light. At the same time, restricting the optical power ratio relationship between the sixth lens 6 and the seventh lens 7 to be between -1 and -0.7 actually restricts the optical power distribution inside the cemented lens group 310, which can ensure the chromatic aberration correction ability of the cemented lens group 310. On the basis of limiting the Abbe number of the seventh lens 7 to be greater than 60, the chromatic focal shift of infrared light relative to visible light can also be reduced.
[0073] On the basis of the above embodiments, to improve the optical effect of the zoom lens and improve the assembly quality of the zoom lens, it is necessary to reasonably configure the focusing group 100. Optionally, the refractive index of the third lens 3 can be set to L3_nd, and the refractive index of the third lens satisfies: L3_nd > 1.6.
[0074] Among them, optical eccentricity refers to the deviation of the optical center of each element in the system relative to the ideal optical axis. The eccentricity of the optical system has a direct impact on the image quality of the optical system. For high-quality zoom lenses, eccentricity requires strict requirements. At the same time, the refractive index of the lens reflects the refracting ability of the lens to light. It can be understood by those skilled in the art that appropriately increasing the refractive index of the third lens 3 in the focusing group 100 can reduce the degree of light deflection here to a certain extent, thereby effectively reducing the sensitivity of the assembly eccentricity in the focusing group, which is conducive to improving the manufacturing yield of the zoom lens.
[0075] At the same time, in order to prevent the zoom lens from having an excessively large lens aperture, for the first lens 1 in the focus group 100, the refractive index of the first lens 1 is set to L1_nd, the maximum aperture of the first lens is set to S1_DIA, and the distance from the front surface vertex of the first lens 1 to the image plane at the wide-angle end of the zoom lens is set to TTL_W. The refractive index of the first lens 1 can be set to satisfy: L1_nd>1.65; the zoom lens satisfies: S1_DIA / TTL_W<0.45.
[0076] In addition, it should be noted that the zoom lens forms an image on the imaging sensor arranged on the focal plane along the optical axis, and a flat filter is also required to be arranged in the middle position for filtering to ensure the imaging effect. In order to ensure that the zoom lens has enough space to install the imaging sensor and the flat filter, the distance from the rear surface vertex of the last lens to the image plane at the wide-angle end of the zoom lens is set to BFL_W, and the distance from the front surface vertex of the first lens to the image plane is set to TTL_W. The zoom lens can be set to satisfy: BFL_W / TTL_W>0.1. At this time, the rear surface of the zoom lens can have enough distance and space to install other optical imaging elements, which helps to improve the convenience of assembly and facilitate the preparation of the zoom lens.
[0077] On the basis of the above embodiment, optionally, in order to ensure that the light transmission of the zoom lens is large enough and the lens size of the zoom group is not too large, the aperture can be set between the fourth lens 4 and the third lens 3 or the fifth lens 5. In addition, let the diameter of the aperture be STO_DIA, the distance from the aperture to the image plane be STO_IMA, and the distance from the front surface vertex of the first lens to the image plane at the wide-angle end of the zoom lens be TTL_W, and the zoom lens can be set to meet: STO_DIA / TTL_W>0.17, 0.5 <STO_IMA / TTL_W<0.6。
[0078] Further optionally, in order to enable the zoom lens to have a large field of view angle, it can be set that when the image height of the zoom lens is 4.4 mm, the object-side field of view angle FOV_W at the wide-angle end and the object-side field of view angle FOV_T at the telephoto end of the zoom lens satisfy: 130 < FOV_W < 145, 50 < FOV_T < 60. At the same time, it can be set that the optical power of the zoom lens at the wide-angle end satisfies 0.2 < W_F < 0.25.
[0079] The embodiments of the present invention adopt a hybrid glass and plastic optical structure. The plastic lens is easy to process, and both the glass lens and the plastic aspherical lens can perform better aberration correction, which reduces the lens manufacturing difficulty and cost, improves the resolution at the same time, and realizes the confocal of visible light and infrared light. The above zoom lens will be described below with three specific embodiments.
[0080] In Embodiment 1, as Figure 1 shown, the zoom lens includes a focusing group 100, a fixed group 200, and a zoom group 300 arranged in sequence from the object side to the image side; the zoom lens further includes a diaphragm 400, and the diaphragm 400 is arranged in the fixed group 200; during the zooming process, the position of the fixed group 200 is fixed, and the zoom group 300 and the focusing group 100 move along the optical axis; wherein, the optical power of the zoom lens at the wide-angle end is W_F, and the optical powers of the focusing group 100, the fixed group 200, and the zoom group 300 are G1_F, G2_F, and G3_F respectively; the optical powers of each group relative to the optical power of the zoom lens at the wide-angle end satisfy: -0.6 < G1_F / W_F < -0.4, 0 < G2_F / W_F < 0.1, 0.32 < G3_F / W_F < 0.42.
[0081] The focusing group 100 includes a first lens 1, a second lens 2, and a third lens 3, the fixed group 200 includes a fourth lens 4, and the zoom group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10; the adjacent surfaces of the sixth lens 6 and the seventh lens 7 are glued to form a glued lens group 310; the optical powers of the first lens 1 to the tenth lens 10 are L1_F, L2_F, L3_F, L4_F, L5_F, L6_F, L7_F, L8_F, L9_F, and L10_F respectively, and the optical power of the glued lens group 310 is U_F. The optical powers of each lens relative to the optical power of its所属 group satisfy the following relational expressions: 0.7 < L1_F / G1_F < 0.9, 0.35 < L2_F / G1_F < 0.7, -0.42 < L3_F / G1_F < -0.2, L4_F = G2_F, 0.8 < L5_F / G3_F < 1, 0.1 < U_F / G3_F < 0.42, 0 < L8_F / G3_F < 0.5, -1 < L9_F / G3_F < -0.4, 0 < L10_F / G3_F < 0.5.
[0082] In this embodiment 1, the design values of the first lens 1 to the tenth lens 10 are shown in the following Table 1.
[0083] Table 1 shows a design value of the zoom lens
[0084]
[0085]
[0086] The surface numbers in Table 1 are numbered according to the order of the surfaces of each lens, where "1" represents the front surface of the first lens, "2" represents the back surface of the first lens, and so on; the surface number 9, the surface shape STO represents the aperture stop. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "INF" represents that the radius of curvature is infinite, representing that the surface is a plane; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the space represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and the space represents that the current position is air; the K value represents the numerical value of the best fitting cone coefficient of the aspheric surface.
[0087] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following representation method:
[0088]
[0089] Among them, z is the axial vector height of the aspheric surface in the Z direction; r is the distance from the point on the aspheric surface to the optical axis; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitted cone coefficient; AF is the coefficient of the 4th, 6th, 8th, 10th, 12th, and 14th order terms of the aspheric polynomial.
[0090] The aspheric surface parameters in this embodiment 1 are shown in Table 2:
[0091] Table 2 shows a design value of the aspheric coefficient in the zoom lens
[0092]
[0093]
[0094] In this embodiment 1, the zoom interval parameters of the zoom lens at the wide-angle end and the telephoto end are shown in Table 3: Table 3 is a design value of the zoom interval at the wide-angle end and the telephoto end of the zoom lens
[0095] Wide angle Telephoto end Zoom interval 1(mm) 10.569 1.466 Zoom interval 2(mm) 6.260 0.949 Zoom interval 3(mm) 5.222 10.534
[0096] In this embodiment 1, the corresponding parameters of the zoom lens are shown in Table 4:
[0097] Table 4 shows the design values of the corresponding parameters in the zoom lens.
[0098]
[0099]
[0100] As can be seen from Table 4, in the zoom lens provided by this Embodiment 1, the focal power of the focusing group 100 is negative, the focal power of the fixed group 200 is positive, the focal power of the zoom group 300 is positive, the focal power of the cemented lens group 310 is positive, and the first lens 1 is a glass spherical negative lens, the second lens 2 is a plastic aspherical negative lens, the third lens 3 is a plastic aspherical positive lens, the fourth lens 4 is a plastic aspherical positive lens, the fifth lens 5 is a glass aspherical positive lens, the sixth lens 6 is a glass spherical negative lens, the seventh lens 7 is a glass spherical positive lens, the eighth lens 8 is a plastic aspherical positive lens, the ninth lens 9 is a plastic aspherical negative lens, and the tenth lens 10 is a plastic aspherical positive lens.
[0101] Figure 2 yes Figure 1 The spherical aberration curve of the zoom lens at the wide angle end is shown in the figure. Figure 3 yes Figure 1 The spherical aberration curve of the zoom lens at the telephoto end is shown in the figure. Figure 4 yes Figure 1 The field curvature and distortion curves of the zoom lens at the wide angle end are shown in the figure. Figure 5 yes Figure 1 The field curvature and distortion curves of the zoom lens at the telephoto end are shown in the figure. Figure 6 yes Figure 1 The vertical axis chromatic aberration curve of the zoom lens at the wide angle end is shown in the figure. Figure 7 yes Figure 1 The vertical axis chromatic aberration curve of the zoom lens at the telephoto end is shown in FIG. Figure 8 yes Figure 1 The color focus shift curve of the wide-angle end of the zoom lens shown in the figure, Fig. 9 yes Figure 1 The chromatic focal shift curve of the telephoto end of the zoom lens shown in FIG. Figure 2 and Figure 3 As shown in FIG. 1 , the zoom lens provided in Example 1 has good correction of spherical aberration and axial chromatic aberration at the wide-angle end and the telephoto end respectively; Figure 4 and Figure 5 As shown, the field curvature and astigmatism of the zoom lens provided in Example 1 are well corrected at the wide-angle end and the telephoto end respectively; Figure 6 and Figure 7As shown, the vertical axis chromatic aberration of the zoom lens provided in Example 1 is well corrected at the wide-angle end and the telephoto end; Figure 8 and Fig. 9 It can be seen that the zoom lens provided in this embodiment 1 has a good correction of the focal shift of the light with a wavelength of 850nm relative to the visible light at the wide-angle end and the telephoto end. In summary, the zoom lens provided in this embodiment 1 has achieved the correction of various aberrations and ensured the imaging quality at the wide-angle end and the telephoto end, that is, the zoom lens provided in this embodiment 1 has a good imaging effect during the zooming process.
[0102] It should be noted that if Figure 2 and Figure 3 As shown, the wavelength range of the spherical aberration curve provided by the embodiment of the present invention is 0.436-0.850 μm; Figure 4 and Figure 5 As shown, in the field curvature and distortion curves provided by the embodiment of the present invention, the maximum fields of view are 68.585° and 27.155° respectively; Figure 6 and Figure 7 As shown, in the vertical axis chromatic aberration curves provided by the embodiments of the present invention, 0.5876 μm is used as the reference wavelength.
[0103] In Example 2, Fig.10 is a schematic diagram of the structure of another zoom lens provided by an embodiment of the present invention, referring to Fig.10 , the zoom lens comprises a focus group 100, a fixed group 200 and a zoom group 300 which are arranged in sequence from the object side to the image side; the zoom lens further comprises an aperture 400 which is arranged in the fixed group 200; during the zooming process, the fixed group 200 is fixed in position, and the zoom group 300 and the focus group 100 move along the optical axis; wherein the focal power of the zoom lens at the wide-angle end is W_F, and the focal powers of the focus group 100, the fixed group 200 and the zoom group 300 are G1_F, G2_F and G3_F respectively; the focal power of each group relative to the zoom lens at the wide-angle end satisfies: -0.6 <G1_F / W_F<-0.4,0<G2_F / W_F<0.1,0.32<G3_F / W_F<0.42。
[0104] The focusing group 100 includes a first lens 1, a second lens 2 and a third lens 3, the fixed group 200 includes a fourth lens 4, and the zoom group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10; the adjacent surfaces of the sixth lens 6 and the seventh lens 7 are glued to form a glued lens group 310; the optical powers of the first lens 1 to the tenth lens 10 are L1_F, L2_F, L3_F, L4_F, L5_F, L6_F, L7_F, L8_F, L9_F, L10_F respectively, and the optical power of the glued lens group 310 is U_F, and the optical power of each lens relative to the group to which it belongs satisfies the following relationship: 0.7 <L1_F / G1_F<0.9,0.35<L2_F / G1_F<0.7,-0.42<L3_F / G1_F<-0.2,L4_F=G2_F,0.8<L5_F / G3_F<1,0.1<U_F / G3_F<0.42,0<L8_F / G3_F<0.5,-1<L9_F / G3_F<-0.4,0<L10_F / G3_F<0.5。
[0105] In this embodiment 2, the design values of the first lens 1 to the tenth lens 10 are shown in Table 5 below.
[0106] Table 5 shows a design value of the zoom lens
[0107]
[0108]
[0109] The surface numbers in Table 5 are numbered according to the order of the surfaces of each lens, where "1" represents the front surface of the first lens, "2" represents the back surface of the first lens, and so on; the surface number 9, the surface shape STO represents the aperture stop. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "INF" represents that the radius of curvature is infinite, representing that the surface is a plane; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the blank represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and the blank represents that the current position is air; the K value represents the numerical value of the best fitting cone coefficient of the aspheric surface.
[0110] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following representation method:
[0111]
[0112] Among them, z is the axial vector height of the aspheric surface in the Z direction; r is the distance from the point on the aspheric surface to the optical axis; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitted cone coefficient; AF is the coefficient of the 4th, 6th, 8th, 10th, 12th, and 14th order terms of the aspheric polynomial.
[0113] The aspheric surface parameters in this embodiment 1 are shown in Table 6:
[0114] Table 6 shows a design value of the aspheric coefficient in the zoom lens
[0115] Serial number A B C D E F 3 -2.802049E-4 5.184597E-6 -8.885305E-8 -8.070910E-10 3.365508E-11 -7.734538E-14 4 -2.133802E-4 -1.080857E-5 6.343753E-8 5.037119E-10 5.255119E-12 -6.914650E-14 5 1.941587E-4 -1.345394E-5 2.177297E-7 1.791887E-9 -4.429789E-11 -2.324502E-13 6 -6.812040E-7 2.080425E-7 -9.409592E-9 2.864117E-9 -3.174779E-11 -8.394460E-13 7 -1.627982E-4 -1.987652E-6 -1.211407E-8 -1.416324E-9 -3.719455E-11 1.353072E-12 8 -2.282837E-4 -1.376063E-7 -3.548033E-8 -2.996612E-9 7.047401E-11 -2.981820E-13 10 -1.473636E-4 3.012053E-6 -1.603152E-7 3.362654E-9 -2.724019E-11 -5.093384E-13 11 3.647079E-4 -1.537080E-6 -1.025173E-9 -4.934591E-10 -4.816624E-12 -1.079268E-13 15 -2.585139E-4 1.154245E-5 -1.539438E-6 3.490092E-9 5.818201E-10 -3.829054E-12 16 9.451098E-4 -1.118549E-4 2.055103E-6 3.534566E-8 -1.497079E-9 5.985980E-12 17 -7.896687E-4 -6.625037E-5 2.063507E-7 2.049117E-7 -4.251044E-9 -5.396773E-11 18 -2.821526E-4 -5.763968E-5 3.823271E-6 -5.235753E-8 -7.819410E-10 -1.646547E-11 19 -2.275189E-3 -5.110574E-5 2.862076E-6 -8.853282E-8 -5.343468E-9 2.970325E-10 20 -1.490021E-3 -3.196860E-5 2.784049E-6 -1.434357E-7 1.940429E-9 7.806196E-11
[0116] In this embodiment 2, the zoom interval parameters of the zoom lens at the wide-angle end and the telephoto end are shown in Table 7:
[0117] Table 7 shows a design value of the zoom interval at the wide-angle end and the telephoto end of the zoom lens.
[0118] Wide angle Telephoto end Zoom interval 1(mm) 9.889 1.165 Zoom interval 2(mm) 5.642 0.249 Zoom interval 3(mm) 5.124 10.517
[0119] In this embodiment 2, the corresponding parameters of the zoom lens are shown in Table 8: Table 8 is the design values of the corresponding parameters of the zoom lens
[0120]
[0121]
[0122] It can be seen from Table 8 that in the zoom lens provided by this Embodiment 2, the focal power of the focusing group 100 is negative, the focal power of the fixed group 200 is positive, the focal power of the zoom group 300 is positive, the focal power of the cemented lens group 310 is positive, and the first lens 1 is a glass spherical negative lens, the second lens 2 is a plastic aspherical negative lens, the third lens 3 is a plastic aspherical positive lens, the fourth lens 4 is a plastic aspherical positive lens, the fifth lens 5 is a glass aspherical positive lens, the sixth lens 6 is a glass spherical negative lens, the seventh lens 7 is a glass spherical positive lens, the eighth lens 8 is a plastic aspherical positive lens, the ninth lens 9 is a plastic aspherical negative lens, and the tenth lens 10 is a plastic aspherical positive lens.
[0123] Fig.11 yes Fig.10 The spherical aberration curve of the zoom lens at the wide angle end is shown in the figure. Fig.12 yes Fig.10 The spherical aberration curve of the zoom lens at the telephoto end is shown in the figure. Fig.13 yes Fig.10 The field curvature and distortion curves of the zoom lens at the wide angle end are shown in the figure. Fig.14 yes Fig.10 The field curvature and distortion curves of the zoom lens at the telephoto end are shown in the figure. Fig.15 yes Fig.10The vertical axis chromatic aberration curve of the zoom lens at the wide angle end is shown in the figure. Fig.16 yes Fig.10 The vertical axis chromatic aberration curve of the zoom lens at the telephoto end is shown in FIG. Fig.17 yes Fig.10 The color focus shift curve of the wide-angle end of the zoom lens shown in the figure, Fig.18 yes Fig.10 The chromatic focal shift curve of the telephoto end of the zoom lens shown in FIG. Fig.11 and Fig.12 As shown in FIG. 1 , the zoom lens provided in Example 2 has good correction of spherical aberration and axial chromatic aberration at the wide-angle end and the telephoto end respectively; Fig.13 and Fig.14 As shown, the field curvature and astigmatism of the zoom lens provided in Example 2 are well corrected at the wide-angle end and the telephoto end respectively; Fig.15 and Fig.16 As shown, the vertical axis chromatic aberration of the zoom lens provided in Example 2 is well corrected at the wide-angle end and the telephoto end; Fig.17 and Fig.18 It can be seen that the zoom lens provided in this embodiment 2 has a good correction of the focal shift of the light with a wavelength of 850nm relative to the visible light at the wide-angle end and the telephoto end. In summary, the zoom lens provided in this embodiment 2 has achieved the correction of various aberrations and ensured the imaging quality at the wide-angle end and the telephoto end, that is, the zoom lens provided in this embodiment 2 has a good imaging effect during the zooming process.
[0124] In Example 3, Fig.19 is a structural schematic diagram of another zoom lens provided by an embodiment of the present invention, referring to Fig.19 , the zoom lens comprises a focus group 100, a fixed group 200 and a zoom group 300 which are arranged in sequence from the object side to the image side; the zoom lens further comprises an aperture 400 which is arranged in the fixed group 200; during the zooming process, the fixed group 200 is fixed in position, and the zoom group 300 and the focus group 100 move along the optical axis; wherein the focal power of the zoom lens at the wide-angle end is W_F, and the focal powers of the focus group 100, the fixed group 200 and the zoom group 300 are G1_F, G2_F and G3_F respectively; the focal power of each group relative to the zoom lens at the wide-angle end satisfies: -0.6 <G1_F / W_F<-0.4,0<G2_F / W_F<0.1,0.32<G3_F / W_F<0.42。
[0125] The focusing group 100 includes a first lens 1, a second lens 2 and a third lens 3, the fixed group 200 includes a fourth lens 4, and the zoom group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10; the adjacent surfaces of the sixth lens 6 and the seventh lens 7 are glued to form a glued lens group 310; the optical powers of the first lens 1 to the tenth lens 10 are L1_F, L2_F, L3_F, L4_F, L5_F, L6_F, L7_F, L8_F, L9_F, L10_F respectively, and the optical power of the glued lens group 310 is U_F, and the optical power of each lens relative to the group to which it belongs satisfies the following relationship: 0.7 <L1_F / G1_F<0.9,0.35<L2_F / G1_F<0.7,-0.42<L3_F / G1_F<-0.2,L4_F=G2_F,0.8<L5_F / G3_F<1,0.1<U_F / G3_F<0.42,0<L8_F / G3_F<0.5,-1<L9_F / G3_F<-0.4,0<L10_F / G3_F<0.5。
[0126] In this embodiment 3, the design values of the first lens 1 to the tenth lens 10 are shown in Table 9 below.
[0127] Table 9 shows a design value of the zoom lens
[0128]
[0129] The surface numbers in Table 9 are numbered according to the order of the surfaces of each lens, where "1" represents the front surface of the first lens, "2" represents the back surface of the first lens, and so on; the surface number 9, the surface shape STO represents the aperture stop. The radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "INF" represents that the radius of curvature is infinite, representing that the surface is a plane; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the blank represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and the blank represents that the current position is air; the K value represents the numerical value of the best fitting cone coefficient of the aspheric surface.
[0130] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following representation method:
[0131]
[0132] Among them, z is the axial vector height of the aspheric surface in the Z direction; r is the distance from the point on the aspheric surface to the optical axis; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitted cone coefficient; AF is the coefficient of the 4th, 6th, 8th, 10th, 12th, and 14th order terms of the aspheric polynomial.
[0133] The aspheric surface parameters in this embodiment 1 are shown in Table 10:
[0134] Table 10 shows a design value of the aspheric coefficient in the zoom lens
[0135]
[0136] In this embodiment 3, the zoom interval parameters of the zoom lens at the wide-angle end and the telephoto end are shown in Table 11:
[0137] Table 11 shows a design value of the zoom interval at the wide-angle end and the telephoto end of the zoom lens
[0138]
[0139]
[0140] In this embodiment 3, the corresponding parameters in the zoom lens are shown in Table 12: Table 12 is the design values of the corresponding parameters in the zoom lens
[0141]
[0142]
[0143] It can be seen from Table 12 that in the zoom lens provided in this Embodiment 3, the focal power of the focusing group 100 is negative, the focal power of the fixed group 200 is positive, the focal power of the zoom group 300 is positive, the focal power of the cemented lens group 310 is positive, and the first lens 1 is a glass spherical negative lens, the second lens 2 is a plastic aspherical negative lens, the third lens 3 is a plastic aspherical positive lens, the fourth lens 4 is a plastic aspherical positive lens, the fifth lens 5 is a glass aspherical positive lens, the sixth lens 6 is a glass spherical negative lens, the seventh lens 7 is a glass spherical positive lens, the eighth lens 8 is a plastic aspherical positive lens, the ninth lens 9 is a plastic aspherical negative lens, and the tenth lens 10 is a plastic aspherical positive lens.
[0144] Fig. 20 yes Fig.19 The spherical aberration curve of the zoom lens at the wide angle end is shown in the figure. Fig.21 yes Fig.19 The spherical aberration curve of the zoom lens at the telephoto end is shown in the figure. Fig. 22 yes Fig.19 The field curvature and distortion curves of the zoom lens at the wide angle end are shown in the figure. Fig.23 yes Fig.19The field curvature and distortion curves of the zoom lens at the telephoto end are shown in the figure. Fig.24 yes Fig.19 The vertical axis chromatic aberration curve of the zoom lens at the wide angle end is shown in the figure. Fig.25 yes Fig.19 The vertical axis chromatic aberration curve of the zoom lens at the telephoto end is shown in FIG. Fig.26 yes Fig.19 The color focus shift curve of the wide-angle end of the zoom lens shown in the figure, Fig. 27 yes Fig.19 The chromatic focal shift curve of the telephoto end of the zoom lens shown in FIG. Fig. 20 and Fig.21 As shown in FIG. 1 , the zoom lens provided in Example 3 has good correction of spherical aberration and axial chromatic aberration at the wide-angle end and the telephoto end respectively; Fig. 22 and Fig.23 As shown, the field curvature and astigmatism of the zoom lens provided in Example 3 are well corrected at the wide-angle end and the telephoto end respectively; Fig.24 and Fig.25 As shown, the vertical axis chromatic aberration of the zoom lens provided in Example 3 is well corrected at the wide-angle end and the telephoto end; Fig.26 and Fig. 27 It can be seen that the zoom lens provided in this embodiment 3 has a good correction of the focal shift of the light with a wavelength of 850nm relative to the visible light at the wide-angle end and the telephoto end. In summary, the zoom lens provided in this embodiment 3 has achieved the correction of various aberrations and ensured the imaging quality at the wide-angle end and the telephoto end, that is, the zoom lens provided in this embodiment 3 has a good imaging effect during the zooming process.
[0145] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A zoom lens, characterized in that: The zoom lens comprises a focus group, a fixed group and a zoom group which are sequentially arranged from the object side to the image side; the zoom lens further comprises an aperture, which is arranged in the fixed group; during the zoom process, the fixed group is fixed in position, and the zoom group and the focus group move along the optical axis; The focal length of the zoom lens at the wide-angle end is W_F, and the focal lengths of the focusing group, the fixed group, and the variable magnification group are G1_F, G2_F, and G3_F, respectively; and the focal length of each group relative to the zoom lens at the wide-angle end satisfies: -0.6 <G1_F / W_F<-0.4; 0 <G2_F / W_F<0.1; 0.32 <G3_F / W_F<0.42; The focusing group includes a first lens, a second lens and a third lens, the fixed group includes a fourth lens, and the zoom group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; the adjacent surfaces of the sixth lens and the seventh lens are glued to form a glued lens group; the optical powers of the first lens to the fifth lens are L1_F, L2_F, L3_F, L4_F, L5_F respectively, the optical power of the glued lens group is U_F, and the optical power of each lens relative to the group to which it belongs satisfies the following relationship: 0.7 <L1_F / G1_F<0.9; 0.35 <L2_F / G1_F<0.7; -0.42 <L3_F / G1_F<-0.2; L4_F=G2_F; 0.8 <L5_F / G3_F<1; 0.1 <U_F / G3_F<0.42; The optical power of the first lens to the tenth lens is negative, negative, positive, positive, positive, negative, positive, positive, positive or negative, positive or negative, respectively; The refractive index of the third lens is L3_nd, and the refractive index of the third lens satisfies: L3_nd>1.
6.
2. The zoom lens according to claim 1, wherein: The focal power L8_F of the eighth lens, the focal power L9_F of the ninth lens and the focal power L10_F of the tenth lens satisfy: 0 <L8_F / G3_F<0.5; -1 <L9_F / G3_F<-0.4; 0 <L10_F / G3_F<0.5。 3. The zoom lens according to claim 1, wherein: The focal power relationship between the sixth lens and the seventh lens satisfies: <L6_F / L7_F<-0.7; The Abbe number of the first lens is L1_vd, the Abbe number of the fifth lens is L5_vd, the Abbe number of the seventh lens is L7_vd, and the Abbe numbers of the first lens, the fifth lens and the seventh lens satisfy: L1_vd>40, L5_vd>70, L7_vd>60.
4. The zoom lens according to claim 1, wherein: The refractive index of the first lens is L1_nd, and the refractive index of the first lens satisfies: L1_nd>1.65; The maximum aperture of the first lens is S1_DIA, the distance from the front surface vertex of the first lens to the image plane of the zoom lens at the wide-angle end is TTL_W, and the zoom lens satisfies: S1_DIA / TTL_W<0.
45.
5. The zoom lens according to claim 1, wherein: At the wide-angle end, the distance from the vertex of the rear surface of the ninth lens to the image plane of the zoom lens is BFL_W, and the distance from the vertex of the front surface of the first lens to the image plane is TTL_W, and the zoom lens satisfies: BFL_W / TTL_W>0.
1.
6. The zoom lens according to claim 1, wherein: The distance that the focusing group moves along the optical axis from the wide-angle end to the telephoto end is G1_L, the distance that the zoom group moves along the optical axis from the wide-angle end to the telephoto end is G3_L, the distance from the front surface vertex of the first lens to the image plane of the zoom lens at the wide-angle end is TTL_W, and the focusing group and the zoom group satisfy: 0.1 <G1_L / TTL_W<0.22,0.05<G3_L / TTL_W<0.15; The focal length of the zoom lens at the telephoto end is T_F, and the zoom lens satisfies: 0.43 <T_F / W_F<0.52。 7. The zoom lens according to claim 1, wherein: The aperture is disposed between the fourth lens and the third lens or the fifth lens; The diameter of the aperture is STO_DIA, the distance from the aperture to the image plane is STO_IMA, the distance from the front surface vertex of the first lens to the image plane at the wide-angle end of the zoom lens is TTL_W, and the zoom lens satisfies: STO_DIA / TTL_W>0.17, 0.5 <STO_IMA / TTL_W<0.6。 8. The zoom lens according to claim 1, wherein: The refractive index of the second lens is L2_nd, the refractive index of the third lens is L3_nd, the refractive index of the fourth lens is L4_nd, the refractive index of the eighth lens is L8_nd, and the refractive index of the ninth lens is L9_nd, then each lens satisfies: L2_nd<1.72, L3_nd<1.72, L4_nd<1.72, L8_nd<1.72, L9_nd<1.
72.
9. The zoom lens according to claim 1, wherein: When the image height of the zoom lens is 4.4 mm, the object field angle FOV_W of the zoom lens at the wide-angle end and the object field angle FOV_T of the zoom lens at the telephoto end satisfy: 130 <FOV_W<145,50<FOV_T<60; The focal length of the zoom lens at the wide angle end satisfies 0.2 <W_F<0.25。