Zoom lens

Abstract

The invention discloses a zoom lens. The zoom lens comprises a focusing lens group with negative focal power, a diaphragm, a zoom lens group with positive focal power and a fixed lens group with positive focal power which are sequentially arranged from an object space to an image space along an optical axis; the diaphragm is located on the side, close to the focusing lens set, of the zoom lens set, and switching of the zoom lens between the wide-angle end and the long-focus end is achieved by changing the positions of the focusing lens set and the zoom lens set on the optical axis. The zoom lens satisfies the following conditions: F1 / FW is greater than or equal to-1.590 and less than or equal to-1.500; f2 / FW is greater than or equal to 1.720 and less than or equal to 1.820; f1 is the focal length of the focusing lens group, F2 is the focal length of the zoom lens group, and FW is the focal length of the wide-angle end. According to the zoom lens provided by the invention, ten lenses are used for forming a three-component structure, full-wave-band confocal under a 1 / 2.7 ''target surface and a wave band of 436-870 nm is realized, and the zoom lens is smaller in size, higher in image quality and suitable for use requirements in more environments.

Description

TECHNICAL FIELD

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

[0002] In the field of security and protection, zoom lenses have been widely used due to their long shooting distance and large shooting angle. With the development of technology, cameras are gradually becoming smaller and more sophisticated, which puts forward higher requirements for mainstream zoom lenses.

[0003] Under the current market environment, small- zoom lenses matched with 1 / 2.7" mainstream chips are widely used and play an important role in the field of security and protection. However, the small- zoom lenses on the market are relatively large in size and only have a resolution of 4MP. Therefore, it is necessary to develop a small- zoom lens with a small size and a resolution of 4K. SUMMARY

[0004] The embodiment of the present application provides a zoom lens. The zoom lens uses 10 lenses to form a three-group structure, realizes full- waveband confocal in the waveband of 436nm-870nm under the 1 / 2.7" target surface, and has a smaller size and higher image quality, which is suitable for use in more environments.

[0005] According to an aspect of the present application, a zoom lens is provided, which comprises, in order from the object side to the image side along the optical axis, a negative focal power focusing lens group, a diaphragm, a positive focal power zoom lens group and a positive focal power fixed lens group;

[0006] The focusing lens group comprises a first lens with negative focal power, a second lens with negative focal power or positive focal power, a third lens with negative focal power and a fourth lens with positive focal power;

[0007] The zoom lens group comprises a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an eighth lens with positive focal power or negative focal power and a ninth lens with positive focal power or negative focal power;

[0008] The fixed lens group comprises a tenth lens with positive focal power;

[0009] The diaphragm is located on the side of the zoom lens group close to the focusing lens group, and the switching of the zoom lens between the wide- angle end and the long- focus end is realized by changing the positions of the focusing lens group and the zoom lens group on the optical axis;

[0010] The zoom lens satisfies the following relationship:

[0011] -1.590≤F1 / FW≤-1.500;

[0012] 1.720≤F2 / FW≤1.820;

[0013] F1 / F2<FW, wherein F1 represents a focal length of the focusing lens group, F2 represents a focal length of the zoom lens group, and FW represents a focal length of the zoom lens at a wide-angle end.

[0014] The zoom lens provided by the embodiment of the present application comprises, in order along the optical axis from the object side to the image side, a focusing lens group with negative refractive power, a diaphragm, a zoom lens group with positive refractive power, and a fixed lens group with positive refractive power; the focusing lens group comprises a first lens with negative refractive power, a second lens with negative refractive power or positive refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power; the zoom lens group comprises a fifth lens with positive refractive power, a sixth lens with positive refractive power, a seventh lens with negative refractive power, an eighth lens with positive refractive power or negative refractive power, and a ninth lens with positive refractive power or negative refractive power; the fixed lens group comprises a tenth lens with positive refractive power; the diaphragm is located on the side of the zoom lens group close to the focusing lens group; the switching of the zoom lens at the wide-angle end and the long-focus end is realized by changing the positions of the focusing lens group and the zoom lens group on the optical axis. The technical solution of the embodiment of the present application uses the three-group zoom lens composed of the above-mentioned combination, which can realize the technical advantages of fast focusing speed, stable focal point in the zooming process, excellent near-object distance performance, and the like; meanwhile, the mechanism of one group of focusing, two groups of zooming, and three groups of fixing is used, the entire zooming process is completed inside the lens, the lens barrel length is unchanged, good sealing and gravity balance are realized, and more use scenarios can be adapted; in addition, the lens with the above-mentioned refractive power can reduce the overall length of the zoom lens, realize the purpose of minimizing the size of the lens, realize high resolution in the entire zooming range and at different focusing distances, make the light pass through the lens more smoothly through the reasonable matching of the refractive power, correct the influence of high-order aberration of the lens on the imaging quality to a great extent, realize the full-waveband confocal in the 436nm~870nm waveband under the 1 / 2.7" target surface, and the lens has smaller size and higher image quality, which is suitable for use in more environments.

[0015] It should be understood that the description in this section is not intended to identify key or critical features of embodiments of the present application or to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0018] Figure 2 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application; Figure 1 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0019] Figure 3 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0020] Figure 4 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0021] Figure 5 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0022] Figure 6 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0023] Figure 7 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0024] Figure 8 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0025] Figure 9 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0026] Figure 10 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0027] Figure 11 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0028] Figure 12 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0029] Figure 13 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0030] Figure 14 A structural schematic diagram of a zoom lens at a wide-angle end provided by an embodiment of the present application;

[0031] Figure 15A light fan diagram of a zoom lens provided by the embodiment of the present application at a long focal end 17.83 degree field of view;

[0032] Figure 16 A light fan diagram of a zoom lens provided by the embodiment of the present application at a long focal end 22.19 degree field of view;

[0033] Figure 17 A light fan diagram of a zoom lens provided by the embodiment of the present application at a long focal end 25.51 degree field of view;

[0034] Figure 18 A curve diagram of the vertical axis chromatic aberration of a zoom lens provided by the embodiment of the present application at a long focal end;

[0035] Figure 19 A structure schematic diagram of another zoom lens provided by the embodiment of the present application at a wide angle end;

[0036] Figure 20 A structure schematic diagram of a middle zoom lens provided by the embodiment of the present application at a long focal end; Figure 19

[0037] Figure 21 A curve diagram of the axial aberration of a zoom lens provided by the embodiment of the present application at a wide angle end;

[0038] Figure 22 A light fan diagram of another zoom lens provided by the embodiment of the present application at a wide angle end 0 degree field of view;

[0039] Figure 23 A light fan diagram of another zoom lens provided by the embodiment of the present application at a wide angle end 16.49 degree field of view;

[0040] Figure 24 A light fan diagram of another zoom lens provided by the embodiment of the present application at a wide angle end 27.49 degree field of view;

[0041] Figure 25 A light fan diagram of another zoom lens provided by the embodiment of the present application at a wide angle end 38.48 degree field of view;

[0042] Figure 26 A light fan diagram of another zoom lens provided by the embodiment of the present application at a wide angle end 49.35 degree field of view;

[0043] Figure 27 A light fan diagram of another zoom lens provided by the embodiment of the present application at a wide angle end 54.62 degree field of view;

[0044] Figure 28 A curve diagram of the vertical axis chromatic aberration of a zoom lens provided by the embodiment of the present application at a wide angle end;

[0045] Figure 29 ​An axial aberration curve of a zoom lens at the telephoto end is provided for an embodiment of the present invention;

[0046] Figure 30 Another optical fan pattern of a zoom lens at a 0-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0047] Figure 31 A fan-shaped optical pattern of another zoom lens with a 7.66-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0048] Figure 32 A fan-shaped optical pattern of another zoom lens at a 12.76-degree field of view at the telephoto end, provided for an embodiment of the present invention;

[0049] Figure 33 A fan-shaped optical pattern of another zoom lens at a 17.84-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0050] Figure 34 Another zoom lens provided in this embodiment of the invention has a field of view of 22.90 degrees at the telephoto end;

[0051] Figure 35 A fan-shaped optical pattern of a zoom lens at a 25.43-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0052] Figure 36 A transverse chromatic aberration curve of a zoom lens at the telephoto end is provided as an embodiment of the present invention;

[0053] Figure 37 This is a schematic diagram of the structure of another zoom lens at the wide-angle end provided in an embodiment of the present invention;

[0054] Figure 38 for Figure 37 A schematic diagram of the structure of a medium zoom lens at the telephoto end;

[0055] Figure 39 An axial aberration curve of a zoom lens at the wide-angle end is provided for an embodiment of the present invention;

[0056] Figure 40 This invention provides another example of a zoom lens with a 0-degree field of view at the wide-angle end;

[0057] Figure 41 A fan-shaped optical pattern of a zoom lens at a 16.84-degree field of view at the wide-angle end, provided as an embodiment of the present invention;

[0058] Figure 42 A fan-shaped optical pattern of a zoom lens at a 27.43-degree field of view at the wide-angle end, provided as an embodiment of the present invention;

[0059] Figure 43A light fan plot of another zoom lens provided by an embodiment of the present application at the wide angle end of 48.02 degrees field of view;

[0060] Figure 44 A light fan plot of another zoom lens provided by an embodiment of the present application at the wide angle end of 48.02 degrees field of view;

[0061] Figure 45 A light fan plot of another zoom lens provided by an embodiment of the present application at the wide angle end of 54.61 degrees field of view;

[0062] Figure 46 A plot of the sagittal chromatic aberration at the wide angle end of a zoom lens provided by an embodiment of the present application;

[0063] Figure 47 A plot of the axial chromatic aberration at the long focal end of a zoom lens provided by an embodiment of the present application;

[0064] Figure 48 A light fan plot of another zoom lens provided by an embodiment of the present application at the long focal end of 0 degrees field of view;

[0065] Figure 49 A light fan plot of another zoom lens provided by an embodiment of the present application at the long focal end of 7.66 degrees field of view;

[0066] Figure 50 A light fan plot of another zoom lens provided by an embodiment of the present application at the long focal end of 12.75 degrees field of view;

[0067] Figure 51 A light fan plot of another zoom lens provided by an embodiment of the present application at the long focal end of 17.81 degrees field of view;

[0068] Figure 52 A light fan plot of another zoom lens provided by an embodiment of the present application at the long focal end of 22.88 degrees field of view;

[0069] Figure 53 A light fan plot of another zoom lens provided by an embodiment of the present application at the long focal end of 25.43 degrees field of view;

[0070] Figure 54 A plot of the sagittal chromatic aberration at the long focal end of a zoom lens provided by an embodiment of the present application. DETAILED DESCRIPTION

[0071] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0072] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0073] Figure 1 A schematic structural view of a zoom lens at a wide-angle end is provided for an embodiment of the present application. Referring to Figure 1 The zoom lens provided by the embodiment of the present application includes, in order along the optical axis from the object side to the image side, a focusing lens group 10 with negative focal power, a diaphragm 20, a zoom lens group 30 with positive focal power, and a fixed lens group 40 with positive focal power; the focusing lens group 10 includes a first lens 101 with negative focal power, a second lens 102 with negative focal power or positive focal power, a third lens 103 with negative focal power, and a fourth lens 104 with positive focal power; the zoom lens group 30 includes a fifth lens 301 with positive focal power, a sixth lens 302 with positive focal power, a seventh lens 303 with negative focal power, an eighth lens 304 with positive focal power or negative focal power, and a ninth lens 305 with positive focal power or negative focal power; the fixed lens group 40 includes a tenth lens 401 with positive focal power; the diaphragm 20 is located on the side of the zoom lens group 30 close to the focusing lens group 10, and the switching of the zoom lens at the wide-angle end and the long-focus end is realized by changing the positions of the focusing lens group 10 and the zoom lens group 30 on the optical axis.

[0074] The zoom lens satisfies the following relationship:

[0075] -1.590≤F1 / FW≤-1.500;

[0076] 1.720≤F2 / FW≤1.820;

[0077] Where F1 represents the focal length of the focusing lens group 10, F2 represents the focal length of the zoom lens group 30, and FW represents the focal length of the zoom lens at the wide-angle end.

[0078] It is understandable that optical power, the reciprocal of focal length, characterizes the ability of an optical system to deflect light. The larger the absolute value of optical power, the stronger the ability to bend light; the smaller the absolute value, the weaker the ability to bend light. When optical power is positive, the refraction of light is converging; when optical power is negative, the refraction of light is diverging. In practical implementation, refer to... Figure 1 The zoom lens also includes a flat glass plate 50, which is located on the side closest to the image plane. The flat glass plate 50 protects the photosensitive chip in the imaging sensor, which converts the light signals collected by the zoom lens into electrical signals, thereby ensuring the imaging effect of the zoom lens. The focusing lens group 10, aperture 20, zoom lens group 30, fixed lens group 40, and flat glass plate 50 can be housed in a single lens barrel. Figure 1 Within the lens assembly (not shown), the position of the fixed lens group 40 is fixed. The focal length of the lens is changed by moving the focusing lens group 10, the aperture stop 20, and the zoom lens group 30. During the zooming process, when the focal length is shortest, the zoom lens is located at the wide-angle end, and when the focal length is longest, the zoom lens is located at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical powers, as well as different lengths or shapes. It should be noted that... Figure 1 The structural diagrams in the following embodiments are for illustrative purposes only, and shapes such as aspherical surfaces are not represented in accordance with actual conditions.

[0079] The technical solution of this invention, using the aforementioned three-group zoom lens, achieves advantages such as fast focusing speed, stable focus during zooming, and excellent close-range performance. Simultaneously, the use of a mechanism with one group for focusing, two groups for zooming, and three groups for fixing allows the entire zooming process to be completed inside the lens, maintaining a constant lens barrel length, achieving good sealing and center-of-gravity balance, and adapting to a wider range of usage scenarios. Furthermore, using the aforementioned lens with the aforementioned optical power combination reduces the overall length of the zoom lens, minimizing its size. It also achieves high resolution across the entire zoom range and at different focusing distances. Combined with the internal zoom structure, the cemented lens elements in the zoom group, and the aperture that moves with the zoom group, it ensures high and low temperature imaging quality. Through the reasonable combination of optical power, light passes through the lens more smoothly, largely correcting the impact of advanced aberrations on image quality. This achieves full-band confocal focusing at a 1 / 2.7″ aperture within the 436nm~870nm wavelength range, while maintaining a smaller lens size and higher image quality, suitable for a wider range of usage environments.

[0080] On the basis of the above embodiment, in the focusing lens group 10, the first lens 101 is a convex-concave lens, the second lens 102 is a concave-convex lens, the third lens 103 is a concave-concave lens, and the fourth lens 104 is a convex-concave lens, in the direction of the optical axis from the object side to the image side; in the zoom lens group 30, the fifth lens 301 is a convex-convex lens, the sixth lens 302 is a convex-convex lens, the seventh lens 303 is a concave-concave lens, the central position of the eighth lens 304 is a concave-convex lens, and the central position of the ninth lens 305 is a convex-concave lens; and in the fixed lens group 40, the tenth lens 401 is a concave-convex lens or a convex-concave lens.

[0081] By setting the shape of each lens, the adaptation of the refractive power of each lens can be achieved.

[0082] Optionally, the zoom lens includes at least four glass lenses, and at least one plastic aspheric lens is included in the focusing lens group 10 and the zoom lens group 30, and the fixed lens group 40 includes one plastic aspheric lens.

[0083] Optionally, the first lens 101 is a glass spherical lens, the second lens 102, the third lens 103, and the fourth lens 104 are plastic aspheric lenses; the fifth lens 301 is a glass aspheric lens, the sixth lens 302 and the seventh lens 303 are glass spherical lenses, the eighth lens 304 and the ninth lens 305 are plastic aspheric lenses, and the sixth lens 302 and the seventh lens 303 form a cemented lens group.

[0084] The two materials of glass and plastic can compensate for each other, and the use of glass lenses and plastic lenses in the zoom lens can better balance the resolution of the zoom lens at high and low temperatures, and the use of reasonable glass lenses also has a good correction effect on the aberration of the lens; the use of the above materials can ensure that the lens has good resolution in the range of-40℃ to 80℃. In addition, the use of glass lenses can correct the chromatic aberration of the lens to a large extent, and the use of the above glass lenses can meet the good resolution in the full waveband of 430nm to 850nm, thereby expanding the use range of the zoom lens.

[0085] After the light passes through the diaphragm 20, the cemented lens group can compensate for the chromatic aberration of the light passing through the glass aspheric lens, and the pipeline-like processing mode greatly improves the efficiency and effect of aberration correction; in addition, the double cemented lens is closely attached to the rear of the glass aspheric lens, which can play a stabilizing and compensating role. The double cemented lens itself is a whole, has good stability, and can help to reduce the sensitivity of the entire optical system to the assembly tolerance of the aspheric lens, thereby reducing the manufacturing cost.

[0086] The tenth lens 401 uses a plastic aspherical lens to control high-order aberration of light at the tail end of the lens, further improving image quality. In addition, the use of an aspherical lens at the tail end of the lens can more finely control the exit angle of light in the lens, improve the matching degree of the lens and the signal receiving device, and prevent the occurrence of dark corners, color drift, noise points, etc. at the edge of the image plane due to excessively large or small light incidence angles. From the cost aspect, the use of a plastic aspherical lens can reduce costs, reduce the weight of the lens, simplify the structure, reduce potential failure points of the lens, and improve reliability during use.

[0087] Optionally, the focusing lens group 10 and the zoom lens group 30 satisfy the following relationship during switching of the zoom lens from the wide-angle end to the telephoto end:

[0088] 0.030≤S1 / TTL≤0.220;

[0089] 0.030≤S1 / S2≤0.270;

[0090] wherein S1 represents the distance between the closest position to the image plane and the farthest position to the image plane of the focusing lens group 10 during movement, S2 represents the distance between the closest position to the image plane and the farthest position to the image plane of the zoom lens group 30 during movement, and TTL represents the total optical length of the zoom lens at the wide-angle end.

[0091] By controlling the movement distance of the focusing lens group 10 and the zoom lens group 30, the movement stroke of the focusing lens group 10 is controlled, ensuring that the zoom lens can quickly respond during focusing. It has strong close-range focusing ability; at the same time, using the above structure, it can accurately position and compensate aberration, and ensure performance at different object distances.

[0092] Optionally, the first lens 101, the fifth lens 301, the sixth lens 302, and the seventh lens 303 satisfy the following requirements:

[0093] 1.430≤nd1≤1.600; 68.000≤vd1≤94.600;

[0094] 1.430≤nd5≤1.560; 70.200≤vd5≤95.200;

[0095] 1.430≤nd6≤1.560; 71.700≤vd6≤95.200;

[0096] 1.670≤nd7≤1.770; 26.500≤vd7≤32.200;

[0097] Wherein, nd1, nd5, nd6 and nd7 represent the refractive index of the first lens 101, the fifth lens 301, the sixth lens 302 and the seventh lens 303 respectively; and vd1, vd5, vd6 and vd7 represent the Abbe number of the first lens 101, the fifth lens 301, the sixth lens 302 and the seventh lens 303 respectively.

[0098] The glass material is used for the first lens 101 in the focusing lens group 10, which can protect the zoom lens to some extent, prolong the service life of the zoom lens, and also can play a certain achromatic effect to avoid excessive chromatic aberration at the rear end of the zoom lens which is difficult to correct; the glass material with large Abbe number is used for the fifth lens 301 in the zoom lens group 30, which can correct the chromatic aberration of the light before entering the diaphragm as much as possible, and avoid greater impact on the rear end; at the same time, the fifth lens 301 is a glass lens, which can ensure the high and low temperature state of the zoom lens group 30 to some extent.

[0099] The sixth lens 302 and the seventh lens 303 in the zoom lens group 30 are glued to form a glued lens group, and the materials of the two lenses are glass, which can cooperate with the fifth lens 301 to control the high and low temperature state of the zoom group. In addition, the glass lens gluing can well eliminate the chromatic aberration of the light just passing through the diaphragm, and the combination of other plastic aspherical lenses can realize high-resolution 4K image quality, which maintains the stability of the optical system in different environments on the basis of fast focusing. In addition, the combination of plastic lenses and glass lenses can reduce the weight of the lens, optimize the cost and production efficiency of the lens.

[0100] Optionally, the maximum lens diameter ΦG1 in the focusing lens group 10 and the total optical length TTL of the zoom lens at the wide-angle end have the following relationship:

[0101] 0.360<ΦG1 / TTL<0.400.

[0102] By controlling the ratio of the front aperture and the total length, the miniaturization and lightness of the optical system can be realized, and the contradiction between the aperture and the field of view angle is balanced, and the design cost of the zoom lens is reduced.

[0103] Optionally, the sixth lens 302 and the seventh lens 303 form a glued lens group, and the glued lens group and the zoom lens group 30 satisfy the following relationship:

[0104] -3.340<EFL67 / F2<-1.510;

[0105] Wherein, EFL67 represents the total focal length of the glued lens group, and F2 represents the focal length of the zoom lens group 30.

[0106] By controlling the ratio of the total focal length of the lens group combined by the sixth lens 302 and the seventh lens 303 in the zoom lens group 30 and the focal length of the zoom lens group 30, the situation of insufficient or excessive correction of chromatic aberration is avoided, and the purpose of balancing aberration is achieved; in addition, when the ratio is within a reasonable range, the zoom lens can exactly match the required chromatic aberration correction amount at all focal lengths, and the purpose of good control of chromatic aberration at the wide-angle end, the middle focal length end and the long focal length end is achieved.

[0107] Optionally, the focal length of the zoom lens at the wide-angle end satisfies the following relationship:

[0108] 0.560≤sinCRA×FW≤0.780;

[0109] Wherein, FW represents the focal length of the zoom lens at the wide-angle end, and CRA represents the chief ray angle of the zoom lens at the wide-angle end.

[0110] By controlling the relationship between the sine value of the chief ray angle and the focal length, the best matching between the zoom lens and the image sensor is ensured, so that a high-quality image from the center to the edge is obtained.

[0111] Optionally, the focal length of the zoom lens at the wide-angle end and the long focal length end satisfies the following relationship:

[0112] FT / FW≥2.15;

[0113] Wherein, FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the long focal length end.

[0114] By controlling the focal length ratio of the zoom lens at the wide-angle end and the long focal length end, the zoom range and the focal length range of the zoom lens can be controlled to meet the use requirements under more conditions.

[0115] In the embodiment of the application, the aspherical lens of the zoom lens satisfies the following formula:

[0116] ;

[0117] Wherein, Z is the axial distance of the curved surface at a position with a height of r perpendicular to the optical axis to the vertex of the surface; c represents the curvature at the vertex of the aspherical surface; k is the fitting conical coefficient; 、 、 、 、 、 is the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order and fourteenth-order high-order aspherical surface coefficient of the corresponding aspherical surface, is combined into the high-order term of the corresponding aspherical surface.

[0118] Exemplarily, Figure 2 isFigure 1 The structure diagram of the zoom lens at the long focal end, and Table 1 is the specific parameters of the zoom lens in Figure 1 and Figure 2 The specific parameters of the zoom lens:

[0119] Table 1 The specific parameters of the zoom lens

[0120]

[0121] Table 2 is the specific lens parameter design values of the zoom lens in Figure 1 and Figure 2

[0122] Table 2 The lens parameter design values of the zoom lens

[0123]

[0124] In Table 2, the surface number is numbered according to the surface order of each lens, surface number 13 represents the bonding surface of the double bonding lens, 21 and 22 represent the two surfaces of the protective glass, and “STO” represents the diaphragm of the zoom lens; IMA represents the image surface; the radius of curvature represents the bending degree of the corresponding lens surface, the positive value represents that the surface is bent to the image side, and the negative value represents that the surface is bent to the object side, wherein “INF” represents that the surface is a plane, and the radius of curvature is infinite; the thickness represents the center axis distance from the current surface to the next surface, and the units of the radius of curvature and the thickness are millimeters; the material (nd) is the refractive index, which represents the deflection ability of the material between the current surface and the next surface to the light; and the space represents that the current position is empty, and the refractive index is 1; the material (vd) is the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0125] Table 3 is the zoom interval value in Table 2:

[0126] Table 3 The zoom interval of the wide-angle end and the long focal end of the zoom lens

[0127]

[0128] Table 4 is the aspheric surface type parameters in the zoom lens in Figure 1 and Figure 2

[0129] Table 4 The aspheric surface parameters of the zoom lens

[0130]

[0131] Continuation of Table 4

[0132]

[0133] ​​wherein 5.35191797096613E-04 represents the coefficient of surface No. 3 with a coefficient of 5.35191797096613E-04 -4 .

[0134] Table 5 is a performance index realized by the embodiment

[0135] Table 5 is a performance index of the zoom lens

[0136]

[0137] Figure 3 Fig. 4 is an axial aberration curve diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end, wherein the vertical direction represents the normalized pupil aperture, 0 represents the optical axis, and the top of the vertical axis represents the maximum pupil radius; the main wavelength is 546.074 nm, and the horizontal direction represents the relative main wavelength offset, in millimeters (mm). As shown in Fig. 4, the axial aberration of the normalized pupil aperture of different wavelengths is controlled within a reasonable range, which indicates that the axial aberration of the zoom lens at the wide-angle end is well controlled. In addition, under the full pupil, there is no obvious chromatic aberration between visible light and infrared light, which meets the basic requirement of clear night imaging and realizes the effect of clear image in the full waveband. Figure 3

[0138] The light fan diagram is one of the commonly used evaluation methods for optical designers. Figure 4 Fig. 5 is a light fan diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end 0-degree field of view, Figure 5 Fig. 6 is a light fan diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end 16.75-degree field of view, Figure 6 Fig. 7 is a light fan diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end 27.36-degree field of view, Figure 7 Fig. 8 is a light fan diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end 38.91-degree field of view, Figure 8 Fig. 9 is a light fan diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end 48.12-degree field of view, Figure 9 Fig. 10 is a light fan diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end 54.89-degree field of view, as shown in Fig. 10, the abscissa is the normalized beam aperture, and the ordinate is the vertical axis aberration. Ideally, each curve should be completely coincident with the abscissa, at which time all the light rays in the field of view are focused on the same point on the ideal image plane; the ordinate in the diagram can also represent the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also represent the size of the vertical chromatic aberration. As shown in Fig. 10, the axial aberration of the normalized pupil aperture of different wavelengths is controlled within a reasonable range, which indicates that the axial aberration of the zoom lens at the wide-angle end is well controlled. In addition, under the full pupil, there is no obvious chromatic aberration between visible light and infrared light, which meets the basic requirement of clear night imaging and realizes the effect of clear image in the full waveband. Figures 4-9 Figures 4-9 ​​It can be seen that the zoom lens is close to the horizontal coordinate at each wavelength under each field of view, which indicates that the sagittal aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously dispersed, which indicates that the zoom lens has good correction of chromatic aberration, ensuring the imaging requirement of clear image in the full waveband.

[0139] Figure 10 The sagittal chromatic aberration curve of a zoom lens at the wide-angle end provided by the embodiment of the present application is shown in the figure, the vertical direction represents the field of view of the zoom lens, 0 represents the optical axis, and the top of the sagittal direction represents the maximum pupil radius; the main wavelength is 546.074nm, and the horizontal direction represents the offset of each wavelength relative to the main wavelength, with the unit of microns (μm). It can be seen from the figure that the sagittal chromatic aberration of different wavelengths is controlled within a reasonable range, which indicates that the sagittal chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the wide-spectrum application requirement of the full waveband. Figure 10 It can be seen that the sagittal chromatic aberration of different wavelengths is controlled within a reasonable range, which indicates that the sagittal chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the wide-spectrum application requirement of the full waveband.

[0140] Figure 11 The axial aberration curve of a zoom lens at the long-focus end provided by the embodiment of the present application is shown in the figure, the vertical direction represents the normalized pupil aperture, 0 represents the optical axis, and the top of the sagittal direction represents the maximum pupil radius; the main wavelength is 546.074nm, and the horizontal direction represents the offset relative to the main wavelength, with the unit of millimeters (mm). It can be seen from the figure that the axial aberration of different wavelengths 0~1.0 normalized pupil aperture is controlled within a reasonable range, which indicates that the axial aberration of the zoom lens at the long-focus end is well controlled. In addition, under the full pupil, visible light and infrared light do not have obvious chromatic aberration, which meets the basic requirement of clear night imaging and realizes the effect of clear image in the full waveband. Figure 11 It can be seen from the figure that the axial aberration of different wavelengths 0~1.0 normalized pupil aperture is controlled within a reasonable range, which indicates that the axial aberration of the zoom lens at the long-focus end is well controlled. In addition, under the full pupil, visible light and infrared light do not have obvious chromatic aberration, which meets the basic requirement of clear night imaging and realizes the effect of clear image in the full waveband.

[0141] Figure 12 The light fan diagram of a zoom lens at the long-focus end 0-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 13 The light fan diagram of a zoom lens at the long-focus end 7.64-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 14 The light fan diagram of a zoom lens at the long-focus end 12.49-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 15 The light fan diagram of a zoom lens at the long-focus end 17.83-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 16 The light fan diagram of a zoom lens at the long-focus end 22.19-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 17 The light fan diagram of a zoom lens at the long-focus end 25.51-degree field of view provided by the embodiment of the present application is shown in the figure, Figures 12-17As shown in the figure, the abscissa is the normalized beam aperture, and the ordinate is the sagittal aberration. Ideally, each curve should be completely coincident with the abscissa, at which time all light rays in the field of view are focused on the same point on the image plane; the ordinate in the figure can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also represent the size of the sagittal chromatic aberration. From the figure, it can be seen that the curves of different wavelengths are close to the abscissa, which means that the sagittal aberration of different wavelengths is well corrected. Figures 12-17 It can be seen that the zoom lens is close to the abscissa at each field of view and each wavelength, which means that the sagittal aberration of different wavelengths is well corrected. In addition, the curves of different colors are not obviously dispersed, which means that the zoom lens also has good correction of chromatic aberration, ensuring the clear imaging requirement of the zoom lens in the full waveband.

[0142] Figure 18 A sagittal chromatic aberration curve diagram of a zoom lens at a long focal end provided by an embodiment of the present application is shown in the figure, the vertical direction represents the field of view of the zoom lens, 0 represents the optical axis, and the vertical direction top represents the maximum field of view; the main wavelength uses 546.074 nm, the horizontal direction represents the offset of the imaging position of each wavelength relative to the imaging position of the main wavelength in the current field of view, and the unit is microns (μm). From the figure, it can be seen that the sagittal chromatic aberration of different wavelengths is controlled within a reasonable range, which means that the sagittal chromatic aberration of the zoom lens at the long focal end is well controlled, and the wide spectrum application requirement of clear imaging in the full waveband can be met. Figure 18 It can be seen that the sagittal chromatic aberration of different wavelengths is controlled within a reasonable range, which means that the sagittal chromatic aberration of the zoom lens at the long focal end is well controlled, and the wide spectrum application requirement of clear imaging in the full waveband can be met.

[0143] Figure 19 A structure schematic diagram of another zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, Figure 20 A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, Figure 19 A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, Figure 19 A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, Figure 20 A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure,

[0144] A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure,

[0145] A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure,

[0146] A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, Figure 19 A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, Figure 20 A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure,

[0147] A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure,

[0148] A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure, A structure schematic diagram of a zoom lens provided by an embodiment of the present application at a wide-angle end is shown in the figure,

[0149] In the table, the surface sequence number in table 7 is numbered according to the surface sequence of each lens, the surface sequence number 13 represents the bonding surface of the double bonding lens, 21 and 22 represent the two surfaces of the protective glass, "STO" represents the diaphragm of the zoom lens; "IMA" represents the image surface; the radius of curvature represents the bending degree of the corresponding lens surface, the positive value represents that the surface is bent to the image side, and the negative value represents that the surface is bent to the object side, wherein "INF" represents that the surface is a plane, and the radius of curvature is infinite; the thickness represents the center axial distance from the current surface to the next surface, and the units of the radius of curvature and the thickness are millimeters; the material (nd) is the refractive index, which represents the deflection ability of the material between the current surface and the next surface to the light; and the space represents that the current position is air, and the refractive index is 1; the material (vd) is the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0150] Table 8 is the zoom interval value in table 7:

[0151] Table 8 zoom interval of the zoom lens at the wide-angle end and the telephoto end

[0152]

[0153] Table 9 is Figure 19 and Figure 20 Aspheric surface type parameters in the zoom lens:

[0154] Table 9 aspheric surface parameters of the zoom lens

[0155]

[0156] Table 9 continued

[0157]

[0158] In the table, -9.67246490620104E-04 represents the coefficient of the surface sequence number 3 The coefficient is -9.67246490620104*10 -4 .

[0159] Table 10 is the performance index realized by the embodiment

[0160] Table 10 performance index of the zoom lens

[0161]

[0162] Figure 21 The axial aberration curve diagram of a zoom lens provided by the embodiment of the application at the wide-angle end, the vertical direction represents the normalization of the pupil aperture, 0 represents on the optical axis, and the top of the vertical axis direction represents the maximum pupil radius; the main wavelength uses 546.074 nm, and the horizontal direction represents the offset of the relative main wavelength, and the unit is millimeter (mm). From the diagram, it can be seen that the zoom lens provided by the embodiment of the application has good axial aberration performance at the wide-angle end.Figure 21 It can be seen that the axial aberrations of different wavelengths 0~1.0 normalized pupil aperture are controlled in a reasonable range, which shows that the axial aberrations of the zoom lens at the wide-angle end are well controlled. In addition, under the full pupil, there is no obvious chromatic aberration between visible light and infrared light, which meets the basic requirement of clear imaging at night and realizes the effect of clear imaging in the full waveband.

[0163] Figure 22 A light fan diagram of another zoom lens provided by the embodiment of the present application at the wide-angle end of 0-degree field of view is shown in the figure, Figure 23 A light fan diagram of another zoom lens provided by the embodiment of the present application at the wide-angle end of 16.49-degree field of view is shown in the figure, Figure 24 A light fan diagram of another zoom lens provided by the embodiment of the present application at the wide-angle end of 27.49-degree field of view is shown in the figure, Figure 25 A light fan diagram of another zoom lens provided by the embodiment of the present application at the wide-angle end of 38.48-degree field of view is shown in the figure, Figure 26 A light fan diagram of another zoom lens provided by the embodiment of the present application at the wide-angle end of 49.35-degree field of view is shown in the figure, Figure 27 A light fan diagram of another zoom lens provided by the embodiment of the present application at the wide-angle end of 54.62-degree field of view is shown in the figure, Figures 22-27 As shown in the figure, the abscissa is the normalized beam aperture, and the ordinate is the sagittal aberration. Ideally, each curve should be completely coincident with the abscissa, at which time all the light rays under the field of view are focused on the same point on the image plane; the ordinate in the figure can also be represented as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also represent the size of the sagittal chromatic aberration. As shown in the figure, Figures 22-27 It can be seen that the sagittal chromatic aberrations of different wavelengths are well close to the abscissa, which shows that the sagittal chromatic aberrations of different wavelengths are well corrected. In addition, the curves of different colors are not obviously dispersed, which shows that the zoom lens has good correction on the chromatic aberration and guarantees the clear imaging requirement of the zoom lens in the full waveband.

[0164] Figure 28 A sagittal chromatic aberration curve diagram of a zoom lens provided by the embodiment of the present application at the wide-angle end is shown in the figure, the vertical direction represents the field of view of the zoom lens, 0 represents on the optical axis, and the top of the vertical direction represents the maximum pupil radius; the main wavelength uses 546.074 nm, and the horizontal direction represents the offset of each wavelength relative to the main wavelength, in units of microns (μm). As shown in the figure, Figure 28 It can be seen that the sagittal chromatic aberrations of different wavelengths are controlled in a reasonable range, which shows that the sagittal chromatic aberrations of the zoom lens at the wide-angle end are well controlled and can meet the wide spectrum application requirement in the full waveband.

[0165] Figure 29The axial aberration curve diagram of a zoom lens provided by the embodiment of the present application at the long-focus end, the vertical direction represents the normalization of the pupil aperture, 0 represents on the optical axis, and the top of the vertical axis represents the maximum pupil radius; the main wavelength uses 546.074 nm, and the horizontal direction represents the offset of the relative main wavelength, in millimeters (mm). From Figure 29 It can be seen that the axial aberration of different wavelengths 0~1.0 normalized pupil aperture is controlled within a reasonable range, which indicates that the axial aberration of the zoom lens at the long-focus end is well controlled. In addition, under the full pupil, there is no obvious chromatic aberration between visible light and infrared light, which meets the basic requirement of clear night imaging and realizes the effect of clear image in the full waveband.

[0166] Figure 30 The light fan diagram of another zoom lens provided by the embodiment of the present application at the long-focus end 0-degree field of view, Figure 31 The light fan diagram of another zoom lens provided by the embodiment of the present application at the long-focus end 7.66-degree field of view, Figure 32 The light fan diagram of another zoom lens provided by the embodiment of the present application at the long-focus end 12.76-degree field of view, Figure 33 The light fan diagram of another zoom lens provided by the embodiment of the present application at the long-focus end 17.84-degree field of view, Figure 34 The light fan diagram of another zoom lens provided by the embodiment of the present application at the long-focus end 22.90-degree field of view, Figure 35 The light fan diagram of another zoom lens provided by the embodiment of the present application at the long-focus end 25.43-degree field of view, as Figures 30-35 shown, the horizontal coordinate is the normalized beam aperture, and the vertical coordinate is the sagittal aberration. Ideally, each curve should be completely coincident with the horizontal coordinate axis, at which time all the light rays under the field of view are focused on the same point on the image plane; the vertical coordinate in the figure can also represent the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also represent the size of the sagittal chromatic aberration. From Figures 30-36 it can be known that the zoom lens is well close to the horizontal coordinate under each field of view and each wavelength, which indicates that the sagittal aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously dispersed, which indicates that the zoom lens also has good correction for chromatic aberration, and guarantees the imaging requirement of clear image in the full waveband.

[0167] Figure 36 The sagittal chromatic aberration curve diagram of a zoom lens provided by the embodiment of the present application at the long-focus end, the vertical direction represents the field of view of the zoom lens, 0 represents on the optical axis, and the top of the vertical direction represents the maximum field of view; the main wavelength uses 546.074 nm, and the horizontal direction represents the offset of the imaging position of each wavelength relative to the imaging position of the main wavelength under the current field of view, in microns (μm). From Figure 36It can be seen that the axial chromatic aberration of different wavelengths is controlled in a reasonable range, which shows that the axial chromatic aberration of the zoom lens at the long-focus end is well controlled, and the wide-spectrum application requirement of clear imaging in the full waveband can be met.

[0168] Figure 37 A structure schematic diagram of a zoom lens at a wide-angle end provided by another embodiment of the present application is shown in FIG. 6. Figure 38 A structure schematic diagram of a zoom lens at a wide-angle end provided by another embodiment of the present application is shown in FIG. 6. Figure 37 A structure schematic diagram of a zoom lens at a wide-angle end provided by another embodiment of the present application is shown in FIG. 6. Figure 37 A structure schematic diagram of a zoom lens at a wide-angle end provided by another embodiment of the present application is shown in FIG. 6. Figure 38 A structure schematic diagram of a zoom lens at a wide-angle end provided by another embodiment of the present application is shown in FIG. 6.

[0169] Table 11: Specific parameters of the zoom lens

[0170]

[0171] Table 12: Specific lens parameter design values of the zoom lens in Figure 37 Figure 38

[0172] Table 12: Specific lens parameter design values of the zoom lens

[0173]

[0174] In Table 12, the surface serial number is numbered according to the surface order of each lens, the surface serial number 13 represents the cemented surface of the double cemented lens, 21 and 22 represent the two surfaces of the protection glass, “STO” represents the diaphragm of the zoom lens, and “IMA” represents the image surface. The curvature radius represents the bending degree of the corresponding lens surface, the positive value represents that the surface is bent to the image side, and the negative value represents that the surface is bent to the object side, wherein “INF” represents that the surface is a plane, and the curvature radius is infinite. The thickness represents the center axis distance from the current surface to the next surface, and the units of the curvature radius and the thickness are millimeters. The material (nd) is the refractive index, which represents the deflection ability of the material between the current surface and the next surface to the light. The space represents that the current position is empty, and the refractive index is 1. The material (vd) is the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface to the light.

[0175] Table 13: Zoom interval values in Table 12:

[0176] Table 13: Zoom interval values in Table 12:

[0177]

[0178] Table 14: Aspheric surface type parameters in the zoom lens in Figure 37 Figure 38

[0179] Table 14: Aspheric surface type parameters in the zoom lens in​​​​

[0180]

[0181] Table 14 (Continued)

[0182]

[0183] wherein 1.69169649933620E-03 represents the coefficient of surface No. 3 The coefficient of surface No. 3 is 1.69169649933620E-03 -3 .

[0184] Table 15 is the performance index realized by the embodiment

[0185] Table 15 Performance index of the zoom lens

[0186]

[0187] Figure 39 The axial aberration curve diagram of a zoom lens provided by the embodiment of the application at the wide-angle end, wherein the vertical direction represents the normalized pupil aperture, 0 represents on the optical axis, and the top of the vertical axis direction represents the maximum pupil radius; the main wavelength uses 546.074 nm, and the horizontal direction represents the offset of the relative main wavelength, with the unit of millimeter (mm). From the diagram, it can be seen that the axial aberration of different wavelengths 0~1.0 normalized pupil aperture is controlled within a reasonable range, which indicates that the axial aberration of the zoom lens at the wide-angle end is well controlled. In addition, under the full pupil, there is no obvious chromatic aberration between visible light and infrared light, which meets the basic requirement of clear night imaging and realizes the effect of clear image in the full waveband. Figure 39

[0188] The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 0-degree field of view, Figure 40 The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 16.84-degree field of view, Figure 41 The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 27.43-degree field of view, Figure 42 The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 38.90-degree field of view, Figure 43 The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 48.02-degree field of view, Figure 44 The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 54.61-degree field of view, as shown in Figure 45 The light fan diagram of another zoom lens provided by the embodiment of the application at the wide-angle end 54.61-degree field of view, as shown in Figures 40-45As shown in the figure, the horizontal coordinate is the normalized beam aperture, and the vertical coordinate is the sagittal aberration. Ideally, each curve should be completely coincident with the horizontal coordinate axis, at which time all light rays in the field of view are focused on the same point on the image plane; the vertical coordinate in the figure can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the sagittal chromatic aberration. Figures 40-45 It can be seen that the zoom lens is close to the horizontal coordinate at each field of view and each wavelength, indicating that the sagittal aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously dispersed, indicating that the zoom lens also has good correction of chromatic aberration, ensuring the imaging requirement of clear image formation in the full waveband.

[0189] Figure 46 The sagittal chromatic aberration curve diagram of a zoom lens at the wide-angle end provided by the embodiment of the present application is shown in the figure, the vertical direction represents the field of view of the zoom lens, 0 represents on the optical axis, and the top of the vertical direction represents the maximum pupil radius; the main wavelength uses 546.074nm, the horizontal direction represents the offset of each wavelength relative to the main wavelength, and the unit is microns (μm). From the figure, Figure 46 It can be seen that the sagittal chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the sagittal chromatic aberration of the zoom lens at the wide-angle end is well controlled, which can meet the wide spectrum application requirement of full waveband.

[0190] Figure 47 The axial aberration curve diagram of a zoom lens at the long-focus end provided by the embodiment of the present application is shown in the figure, the vertical direction represents the normalized pupil aperture, 0 represents on the optical axis, and the top of the vertical direction represents the maximum pupil radius; the main wavelength uses 546.074nm, the horizontal direction represents the offset relative to the main wavelength, and the unit is millimeters (mm). From the figure, Figure 47 It can be seen that the axial aberration of different wavelengths 0~1.0 normalized pupil aperture is controlled within a reasonable range, indicating that the axial aberration of the zoom lens at the long-focus end is well controlled. In addition, under the full pupil, there is no obvious chromatic aberration between visible light and infrared light, which meets the basic requirement of clear night imaging and realizes the effect of clear image formation in the full waveband.

[0191] Figure 48 The light fan diagram of another zoom lens at the long-focus end 0-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 49 The light fan diagram of another zoom lens at the long-focus end 7.66-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 50 The light fan diagram of another zoom lens at the long-focus end 12.75-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 51 The light fan diagram of another zoom lens at the long-focus end 17.81-degree field of view provided by the embodiment of the present application is shown in the figure, Figure 52 The light fan diagram of another zoom lens at the long-focus end 22.88-degree field of view provided by the embodiment of the present application is shown in the figure,Figure 53 A zoom lens provided by an embodiment of the present application is shown in a long focal end 25.43 degree field of view (FOV) light fan diagram, as shown in FIG. 6. Figures 48-53 As shown in the figure, the horizontal axis is a normalized beam aperture, and the vertical axis is a sagittal aberration. Ideally, each curve should be completely coincident with the horizontal axis, at which time all light rays in the field of view are focused on the same point on the image plane; the vertical axis in the figure can also represent the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also represent the size of the sagittal chromatic aberration. As shown in FIG. 6, Figures 48-53 It can be seen that the zoom lens is close to the horizontal axis at each field of view and each wavelength, which indicates that the sagittal aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously dispersed, which indicates that the zoom lens also has good correction for chromatic aberration, ensuring the clear imaging requirement of the zoom lens in the full waveband.

[0192] Figure 54 A zoom lens provided by an embodiment of the present application is shown in a long focal end 25.43 degree field of view (FOV) light fan diagram, as shown in FIG. 6. Figure 54 It can be seen that the zoom lens is close to the horizontal axis at each field of view and each wavelength, which indicates that the sagittal aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously dispersed, which indicates that the zoom lens also has good correction for chromatic aberration, ensuring the clear imaging requirement of the zoom lens in the full waveband.

[0193] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A zoom lens, characterized in that, The zoom lens comprises, in order from the object side to the image side along the optical axis, a focusing lens group with negative focal power, a diaphragm, a zoom lens group with positive focal power, and a fixed lens group with positive focal power; The focusing lens group comprises a first lens with negative focal power, a second lens with negative focal power or positive focal power, a third lens with negative focal power, and a fourth lens with positive focal power; The zoom lens group comprises a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, an eighth lens with positive focal power or negative focal power, and a ninth lens with positive focal power or negative focal power; The fixed lens group comprises a tenth lens with positive focal power; The diaphragm is located on the side of the zoom lens group close to the focusing lens group, and the switching of the zoom lens between the wide-angle end and the telephoto end is realized by changing the positions of the focusing lens group and the zoom lens group on the optical axis; The zoom lens satisfies the following relationship: -1.590≤F1 / FW≤-1.500; 1.720≤F2 / FW≤1.820; Wherein, F1 represents the focal length of the focusing lens group, F2 represents the focal length of the zoom lens group, and FW represents the focal length of the zoom lens at the wide-angle end.

2. The zoom lens according to claim 1, characterized by In the focusing lens group, the first lens is a convex-concave lens, the second lens is a concave-convex lens, the third lens is a concave-concave lens, and the fourth lens is a convex-concave lens, in order from the object side to the image side along the optical axis; In the zoom lens group, the fifth lens is a convex-convex lens, the sixth lens is a convex-convex lens, the seventh lens is a concave-concave lens, the center position of the eighth lens is a concave-convex lens, and the center position of the ninth lens is a convex-concave lens; In the fixed lens group, the tenth lens is a concave-convex lens or a convex-concave lens.

3. The zoom lens according to claim 1, characterized by The zoom lens comprises at least four glass lenses, and at least one plastic aspheric lens exists in the focusing lens group and the zoom lens group, and the fixed lens group comprises one plastic aspheric lens.

4. The zoom lens according to claim 3, characterized by The first lens is a glass spherical lens, and the second lens, the third lens, and the fourth lens are plastic aspheric lenses; The fifth lens is a glass aspheric lens, the sixth lens and the seventh lens are glass spherical lenses, and the eighth lens and the ninth lens are plastic aspheric lenses.

5. A zoom lens according to claim 1, wherein The focusing lens group and the zoom lens group satisfy the following relationship during the switching of the zoom lens from the wide-angle end to the telephoto end: 0.030≤S1 / TTL≤0.220; 0.030≤S1 / S2≤0.270; Wherein, S1 represents the distance between the closest position to the image plane and the farthest position to the image plane of the focusing lens group during movement, S2 represents the distance between the closest position to the image plane and the farthest position to the image plane of the zoom lens group during movement, and TTL represents the total optical length of the zoom lens at the wide-angle end.

6. The zoom lens according to claim 1, characterized by The first lens, the fifth lens, the sixth lens, and the seventh lens satisfy the following requirements: 1.430≤nd1≤1.600; 68.000≤vd1≤94.600; 1.430≤nd5≤1.560; 70.200≤vd5≤95.200; 1.430≤nd6≤1.560; 71.700≤vd6≤95.200; 1.670≤nd7≤1.770; 26.500≤vd7≤32.200; wherein nd1, nd5, nd6 and nd7 represent the refractive index of the first lens, the fifth lens, the sixth lens and the seventh lens respectively; and vd1, vd5, vd6 and vd7 represent the Abbe number of the first lens, the fifth lens, the sixth lens and the seventh lens respectively.

7. The zoom lens according to claim 1, characterized by The maximum lens diameter ΦG1 in the focusing lens group and the total optical length TTL of the zoom lens at the wide-angle end satisfy the following relationship: 0.360<ΦG1 / TTL<0.

400.

8. The zoom lens according to claim 1, characterized by The sixth lens and the seventh lens form a cemented lens group, and the cemented lens group and the zoom lens group satisfy the following relationship: -3.340<EFL67 / F2<-1.510; wherein EFL67 represents the total focal length of the cemented lens group, and F2 represents the focal length of the zoom lens group.

9. The zoom lens according to claim 1, characterized by The focal length of the zoom lens at the wide-angle end satisfies the following relationship: 0.560≤sinCRA×FW≤0.780; wherein FW represents the focal length of the zoom lens at the wide-angle end, and CRA represents the chief ray angle of the zoom lens at the wide-angle end.

10. The zoom lens according to claim 1, characterized by The focal length of the zoom lens at the wide-angle end and the focal length of the zoom lens at the telephoto end satisfy the following relationship: FT / FW≥2.15; wherein FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the telephoto end.

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