A zoom lens

Abstract

The invention discloses a zoom lens, which comprises: a first fixed lens group with positive focal length, a first variable magnification lens group with negative focal length, an aperture, a second variable magnification lens group with positive focal length, a focusing lens group with positive focal length, and a second fixed lens group with negative focal length, which are arranged in sequence along an optical axis from an object side to an image side; the first variable magnification lens group, the second variable magnification lens group and the focusing lens group are all movably arranged between the first fixed lens group and the second fixed lens group; between the first variable magnification lens group and the second variable magnification lens group, a first variable magnification lens group and a focusing lens group are arranged in sequence along an optical axis When the magnification lens group moves in coordination along the direction of the optical axis, the zoom lens achieves magnification; when the focus lens group moves along the direction of the optical axis, the zoom lens achieves zooming; wherein, the focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 of the zoom lens at the wide-angle end satisfy: 0.664≤|FW / DIS1|≤1.927; the focal length FT of the zoom lens at the telephoto end and the optical distortion DIS2 of the zoom lens at the telephoto end satisfy: 440.556≤|FT / DIS2|≤8569.115.

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] A zoom lens is a lens that can change its focal length within a certain range, thereby obtaining different widths of field angles, different sizes of images, and different ranges of scenery. The zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so that the zoom lens can achieve good shooting effects in different usage scenarios, thus making the zoom lens have a wide range of application prospects.

[0003] With the development of science and technology, all types of lenses are gradually moving towards miniaturization and refinement, which also puts forward more stringent requirements for zoom lenses. Therefore, how to make zoom lenses have the characteristics of large magnification, large aperture, and small distortion has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a zoom lens to solve the defects of the prior art, so that the zoom lens has the characteristics of large magnification, large aperture, small distortion, etc., thereby meeting the demand for high-quality imaging.

[0005] The present invention provides a zoom lens, which comprises: a first fixed lens group with positive focal power, a first variable-power lens group with negative focal power, an aperture stop, a second variable-power lens group with positive focal power, a focusing lens group with positive focal power, and a second fixed lens group with negative focal power, which are arranged in sequence along an optical axis from an object side to an image side;

[0006] The first variator lens group, the second variator lens group and the focus lens group are all movably arranged between the first fixed lens group and the second fixed lens group; when the first variator lens group and the second variator lens group move in coordination along the direction of the optical axis, the zoom lens can be variably magnified; when the focus lens group moves along the direction of the optical axis, the zoom lens can be zoomed;

[0007] The focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 of the zoom lens at the wide-angle end satisfy:

[0008] 0.664≤|FW / DIS1|≤1.927;

[0009] The focal length FT of the zoom lens at the telephoto end and the optical distortion DIS2 of the zoom lens at the telephoto end satisfy:

[0010] 440.556≤|FT / DIS2|≤8569.115.

[0011] Optional, 29.948≤FT / FW≤49.373.

[0012] Optionally, the focal length G1 of the first fixed lens group, the focal length G2 of the first variable-power lens group, the focal length G3 of the second variable-power lens group, the focal length G4 of the focusing lens group, and the focal length G5 of the second fixed lens group satisfy:

[0013] 7.952≤G1 / FW≤14.532;

[0014] -1.407≤G2 / FW≤-2.512;

[0015] 4.019≤G3 / FW≤7.625;

[0016] 2.498≤G4 / FW≤4.877;

[0017] -8.951≤G5 / FW≤-51.307.

[0018] Optionally, the maximum movable distance D2 of the first variator lens group, the maximum movable distance D3 of the second variator lens group, and the maximum movable distance D4 of the focus lens group satisfy:

[0019] 4.806≤|D2 / D4|≤6.510;

[0020] 0.799≤|D3 / D4|≤3.897.

[0021] Optionally, the total optical system length TTL of the zoom lens, the moving distance D2 of the first variator lens group, and the moving distance D3 of the second variator lens group satisfy:

[0022] 2.871≤|TTL / D2|≤3.253;

[0023] 3.711≤|TTL / D3|≤11.410.

[0024] Optionally, the first fixed lens group includes a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side.

[0025] Optionally, the first lens and the second lens form a cemented lens.

[0026] Optionally, the focal length f1 of the cemented lens formed by the first lens and the second lens satisfies:

[0027] 369.802≤|f1 / FW|≤664.378.

[0028] Optionally, the focal length f1 of the cemented lens formed by the first lens and the second lens satisfies:

[0029] 11.930≤|f1 / FT|≤12.674.

[0030] Optionally, the focal length f1 of the cemented lens formed by the first lens and the second lens satisfies:

[0031] 62.583≤|f1 / (FT / FW)|≤113.731.

[0032] Optionally, the object side surface of the first lens is a convex surface;

[0033] The object side surface of the second lens is convex, and the image side surface is concave;

[0034] The object side surface of the third lens is convex, and the image side surface is concave;

[0035] The object side surface of the fourth lens is convex, and the image side surface is concave;

[0036] The object side surface of the fifth lens is convex, and the image side surface is concave.

[0037] Optionally, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.

[0038] Optionally, the first variable power lens group includes a sixth lens with negative optical power, a seventh lens with negative optical power, and an eighth lens with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side.

[0039] Optionally, the seventh lens is a glass aspherical lens; and the sixth lens and the eighth lens are both glass spherical lenses.

[0040] Optionally, the object side surface of the sixth lens is convex, and the image side surface is concave;

[0041] The object side surface of the seventh lens is concave, and the image side surface is concave;

[0042] The object-side surface of the eighth lens is convex, and the image-side surface is convex.

[0043] Optionally, the refractive index Nd7 and the Abbe number Vd7 of the seventh lens satisfy:

[0044] 1.45≤Nd7≤1.55;

[0045] 40.00≤Vd7≤95.00.

[0046] Optionally, the second zoom lens group includes a ninth lens with positive optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side.

[0047] Optionally, the tenth lens and the eleventh lens form a cemented lens.

[0048] Optionally, the twelfth lens is a glass aspherical lens; the ninth lens, the tenth lens and the eleventh lens are all glass spherical lenses.

[0049] Optionally, the object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface;

[0050] The object side surface of the tenth lens is a convex surface;

[0051] The object side surface of the eleventh lens is a concave surface, and the image side surface is a concave surface;

[0052] The object side surface of the twelfth lens is convex, and the image side surface is concave.

[0053] Optionally, the refractive index Nd12 and the Abbe number Vd12 of the twelfth lens satisfy:

[0054] 1.45≤Nd12≤1.55;

[0055] 40.00≤Vd12≤95.00.

[0056] Optionally, the focusing lens group includes a thirteenth lens with positive optical power and a fourteenth lens with negative optical power, which are arranged in sequence along the optical axis from the object side to the image side.

[0057] Optionally, the thirteenth lens is a glass aspherical lens; and the fourteenth lens is a glass spherical lens.

[0058] Optionally, the object side surface of the thirteenth lens is a convex surface, and the image side surface is a convex surface;

[0059] The object side surface of the fourteenth lens is concave, and the image side surface is convex.

[0060] Optionally, the refractive index Nd13 and the Abbe number Vd13 of the thirteenth lens satisfy:

[0061] 1.45≤Nd13≤1.55;

[0062] 40.00≤Vd13≤95.00.

[0063] Optionally, the second fixed lens group includes a fifteenth lens with negative optical power.

[0064] Optionally, the fifteenth lens is a glass aspherical lens.

[0065] Optionally, the image side surface of the fifteenth lens is concave, and the object side surface is convex.

[0066] Optionally, the refractive index Nd15 and the Abbe number Vd15 of the fifteenth lens satisfy:

[0067] 1.45≤Nd15≤1.75;

[0068] 20.00≤Vd15≤55.00.

[0069] The technical solution of the present invention sets the optical focal length of the first fixed lens group to be positive, the optical focal length of the first variable magnification lens group to be negative, the optical focal length of the second variable magnification lens group to be positive, the optical focal length of the focus lens group to be positive, and the optical focal length of the second fixed lens group to be negative, thereby ensuring that light can enter through the first fixed lens group and can smoothly pass through the subsequent structure and reach the imaging surface, and at the same time the zoom lens can have a longer focal length and a larger aperture; by making the focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 satisfy 0.664≤|FW / DIS1|≤1.927, and the focal length FT of the zoom lens at the telephoto end and the optical distortion DIS2 satisfy 440.556≤|FT / DIS2|≤8569.115, the zoom lens can meet a larger magnification while having smaller distortion, thereby making the zoom lens have higher imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 is a schematic structural diagram of a zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0071] Figure 2 is a schematic structural diagram of a zoom lens provided by an embodiment of the present invention at a mid-focus end;

[0072] Figure 3 is a schematic structural diagram of a zoom lens at a telephoto end provided by an embodiment of the present invention;

[0073] Figure 4 is a field curvature distortion diagram of a zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0074] Figures 5 to 7 is a light fan diagram of a zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0075] Figure 8 is a vertical axis chromatic aberration diagram of a zoom lens at a wide angle end provided by an embodiment of the present invention;

[0076] Fig. 9is an axial aberration diagram of a zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0077] Fig.10 is a field curvature distortion diagram of a zoom lens at a mid-focus end provided by an embodiment of the present invention;

[0078] Figures 11 to 13 is a light fan diagram of a zoom lens at a mid-focus end provided by an embodiment of the present invention;

[0079] Fig.14 is a vertical axis chromatic aberration diagram of a zoom lens at a mid-focus end provided by an embodiment of the present invention;

[0080] Fig.15 is an axial aberration diagram of a zoom lens at a mid-focus end provided by an embodiment of the present invention;

[0081] Fig.16 is a field curvature distortion diagram of a zoom lens at a telephoto end provided by an embodiment of the present invention;

[0082] Figures 17 to 19 is a light fan diagram of a zoom lens at a telephoto end provided by an embodiment of the present invention;

[0083] Fig. 20 is a vertical axis chromatic aberration diagram of a zoom lens at a telephoto end provided by an embodiment of the present invention;

[0084] Fig.21 is an axial aberration diagram of a zoom lens at a telephoto end provided by an embodiment of the present invention;

[0085] Fig. 22 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at a wide-angle end;

[0086] Fig.23 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at a mid-focus end;

[0087] Fig.24 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at a telephoto end;

[0088] Fig.25 is a field curvature distortion diagram of another zoom lens provided by an embodiment of the present invention at a wide-angle end;

[0089] Figure 26 to Figure 28 is a light fan diagram of another zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0090] Fig.29 is a vertical axis chromatic aberration diagram of another zoom lens provided by an embodiment of the present invention at a wide angle end;

[0091] Fig.30 is an axial aberration diagram of another zoom lens at the wide-angle end provided by an embodiment of the present invention;

[0092] Fig.31 is a field curvature distortion diagram of another zoom lens provided by an embodiment of the present invention at a mid-focus end;

[0093] Figure 32 to Figure 34 is a light fan diagram of another zoom lens provided by an embodiment of the present invention when it is at a mid-focus end;

[0094] Fig.35 is a vertical axis chromatic aberration diagram of another zoom lens provided by an embodiment of the present invention at the mid-focus end;

[0095] Fig.36 is an axial aberration diagram of another zoom lens provided by an embodiment of the present invention at the mid-focus end;

[0096] Fig.37 is a field curvature distortion diagram of another zoom lens provided by an embodiment of the present invention at the telephoto end;

[0097] Figures 38 to 40 is a light fan diagram of another zoom lens provided by an embodiment of the present invention when it is at the telephoto end;

[0098] Fig.41 is a vertical axis chromatic aberration diagram of another zoom lens at the telephoto end provided by an embodiment of the present invention;

[0099] Fig.42 is an axial aberration diagram of another zoom lens at the telephoto end provided by an embodiment of the present invention;

[0100] Fig.43 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at a wide-angle end;

[0101] Fig.44 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at a mid-focus end;

[0102] Fig.45 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at a telephoto end;

[0103] Fig.46 is a field curvature distortion diagram of another zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0104] Figure 47 to Figure 49 This is a light fan diagram of another zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0105] Fig.50 is a vertical axis chromatic aberration diagram of another zoom lens at a wide angle end provided by an embodiment of the present invention;

[0106] Fig.51 is an axial aberration diagram of another zoom lens at the wide-angle end provided by an embodiment of the present invention;

[0107] Fig.52 is a field curvature distortion diagram of another zoom lens at the mid-focus end provided by an embodiment of the present invention;

[0108] Figure 53 to Figure 55 This is a light fan diagram of another zoom lens at the mid-focus end provided by an embodiment of the present invention;

[0109] Fig.56 is a vertical axis chromatic aberration diagram of another zoom lens at the mid-focus end provided by an embodiment of the present invention;

[0110] Fig.57 is an axial aberration diagram of another zoom lens at the mid-focus end provided by an embodiment of the present invention;

[0111] Fig.58 is a field curvature distortion diagram of another zoom lens at the telephoto end provided by an embodiment of the present invention;

[0112] Figure 59 to Figure 61 is a light fan diagram of another zoom lens at the telephoto end provided by an embodiment of the present invention;

[0113] Fig.62 is a vertical axis chromatic aberration diagram of another zoom lens at the telephoto end provided by an embodiment of the present invention;

[0114] Fig.63 This is an axial aberration diagram of another zoom lens at the telephoto end provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0115] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be fully described below in conjunction with the drawings in the embodiments of the present invention through specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Various modifications and changes can be made in the present invention without departing from the spirit or scope of the present invention, which is obvious to those skilled in the art. Therefore, the present invention is intended to cover modifications and changes of the present invention that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents.

[0116] Moreover, the words "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, the descriptions of the same, equal, etc. involved in the embodiments of the present disclosure do not mean that the two objects are completely equal in size and shape, and are allowed to be roughly the same or roughly equal within a certain error range.

[0117] It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other if there is no contradiction.

[0118] An embodiment of the present invention provides a zoom lens, such as Figures 1 to 3 As shown, the zoom lens comprises a first fixed lens group 10 with positive focal power, a first variable magnification lens group 20 with negative focal power, an aperture 60, a second variable magnification lens group 30 with positive focal power, a focus lens group 40 with positive focal power, and a second fixed lens group 50 with negative focal power, which are arranged in sequence from the object side to the image side along the optical axis; the first variable magnification lens group 20, the second variable magnification lens group 30 and the focus lens group 40 are all movably arranged between the first fixed lens group 10 and the second fixed lens group 50; 0 and the second zoom lens group 30 move in coordination along the direction of the optical axis, the zoom lens is zoomed; when the focusing lens group 40 moves along the direction of the optical axis, the zooming of the zoom lens is realized; wherein, the focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 of the zoom lens at the wide-angle end satisfy: 0.664≤|FW / DIS1|≤1.927; the focal length FT of the zoom lens at the telephoto end and the optical distortion DIS2 of the zoom lens at the telephoto end satisfy: 440.556≤|FT / DIS2|≤8569.115.

[0119] In the zoom lens provided in this embodiment, the first fixed lens group 10, the first variable magnification lens group 20, the second variable magnification lens group 30, the focus lens group 40 and the second fixed lens group 50 can be arranged in a lens barrel ( Figures 1 to 3The first fixed lens group 10 and the second fixed lens group 50 are fixed in the lens barrel. At this time, the first fixed lens group 10 and the second fixed lens group 50 remain stationary relative to the image plane. The first variable magnification lens group 20, the second variable magnification lens group 30 and the focus lens group 40 can move back and forth along the optical axis in the lens barrel. When the first variable magnification lens group 20 and the second variable magnification lens group 30 move, they can play a role of magnification, and when the focus lens group 40 moves, it can play a role of focusing. Through the joint movement of the first variable magnification lens group 20, the second variable magnification lens group 30 and the focus lens group 40, the focal length of the zoom lens can be continuously changed from wide angle to telephoto.

[0120] It can be understood that in the process of achieving zooming by moving the first magnification lens group 20, the second magnification lens group 30 and the focusing lens group 40, the zoom lens is located at the wide-angle end when the focal length is short, and is located at the telephoto end when the focal length is longest. 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.

[0121] In this embodiment, when the zoom lens is at the wide-angle end, the focal length of the zoom lens is the shortest, and its focal length FW and its optical distortion DIS1 at this time satisfy 0.664≤|FW / DIS1|≤1.927, that is, the ratio between the focal length FW of the zoom lens and its optical distortion DIS1 at this time is a smaller value, so that the zoom lens can have smaller optical distortion; when the zoom lens is at the telephoto end, the focal length of the zoom lens is the longest, and its focal length FT and its optical distortion DIS2 at this time satisfy 440.556≤|FT / DIS2|≤8569.115, that is, the ratio between the focal length FT of the zoom lens and its optical distortion DIS2 at this time is a larger value, which can also ensure that the zoom lens has smaller optical distortion; in this way, the zoom lens can have smaller optical distortion at both the wide-angle end and the telephoto end, ensuring that the zoom lens can have higher imaging quality at both the wide-angle end and the telephoto end.

[0122] It should be noted that the focal power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam. Its value is the reciprocal of the focal length, and it characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power, the stronger the ability to bend light, and the smaller the absolute value of the focal power, the weaker the ability to bend light. When the focal power is a positive number, the refraction of light is convergent; when the focal power is a negative number, the refraction of light is divergent. The focal power can be used to characterize a certain refractive surface of a lens (i.e., a surface of a lens), can be used to characterize a certain lens, and can also be used to characterize a system formed by multiple lenses (i.e., a lens group).

[0123] In this embodiment, by making the first fixed lens group 10 have a positive optical focal length, the first variable magnification lens group 20 have a negative optical focal length, the second variable magnification lens group 30 have a positive optical focal length, the focusing lens group 40 has a positive optical focal length, and the second fixed lens group 50 has a negative optical focal length, the optical focal lengths of the lens groups are coordinated with each other to ensure that the zoom lens can have a larger aperture and a longer focal length. At the same time, after the light enters through the first fixed lens group 10, it can smoothly pass through the lens groups, which is beneficial to reducing the aberration and chromatic aberration of the zoom lens and ensuring that the zoom lens has a higher imaging quality.

[0124] In addition, an aperture 60 is provided between the first zoom lens group 20 and the second zoom lens group 30. The aperture 60 can adjust the propagation direction of the light beam, which is beneficial to improving the imaging quality. By providing the aperture 60 between the two zoom lens groups, the high-order aberration of the zoom lens can be controlled at the front end, ensuring that the rear end of the zoom lens has a higher image height, expanding the imaging target surface while improving the imaging quality, so that the zoom lens can be applied to different application scenarios.

[0125] In summary, the zoom lens provided in this embodiment can have a longer focal length, a larger aperture, and a larger magnification, and at the same time can have smaller optical distortion at both the wide-angle end and the telephoto end, meeting the high-quality imaging requirements, so that the zoom lens can be suitable for more application scenarios.

[0126] Optionally, 29.948≤FT / FW≤49.373. In this way, the maximum magnification of the zoom lens is close to 50 times, meeting the demand for a larger magnification; at the same time, by setting the ratio of the focal length FT of the zoom lens at the telephoto end to the focal length FW of the wide-angle end, while ensuring that the zoom lens has a larger magnification and imaging target surface, the optical distortion can be controlled within a reasonable small range, and the required imaging details can be better magnified without affecting the imaging effect, meeting the high-quality imaging requirements at various magnifications.

[0127] Optionally, the focal length G1 of the first fixed lens group 10, the focal length G2 of the first variator lens group 20, the focal length G3 of the second variator lens group 30, the focal length G4 of the focusing lens group 40, and the focal length G5 of the second fixed lens group 50 satisfy: 7.952≤G1 / FW≤14.532; -1.407≤G2 / FW≤-2.512; 4.019≤G3 / FW≤7.625; 2.498≤G4 / FW≤4.877; -8.951≤G5 / FW≤-51.307.

[0128] In this way, by reasonably allocating the focal length of each lens group, the light can pass through each lens group more smoothly, which can correct the high-order aberrations of the lens to a great extent and improve the imaging quality.

[0129] Optionally, the maximum movable distance D2 of the first zoom lens group 20, the maximum movable distance D3 of the second zoom lens group 30, and the maximum movable distance D4 of the focus lens group 40 satisfy: 4.806≤|D2 / D4|≤6.510; 0.799≤|D3 / D4|≤3.897. With such a configuration, while ensuring the stability of the focal length change when the zoom lens is zooming, it can focus quickly; at the same time, the volume of the focus lens group 40 can be greatly reduced, which is conducive to reducing the volume of the zoom lens.

[0130] Optionally, the total optical system length TTL of the zoom lens, the moving distance D2 of the first variator lens group 20, and the moving distance D3 of the second variator lens group 30 satisfy: 2.871≤|TTL / D2|≤3.253; 3.711≤|TTL / D3|≤11.410.

[0131] In this embodiment, by setting a range of values ​​of the ratio of the total optical system length TTL of the zoom lens to the moving distance D2 of the first magnification lens group 20, and setting a range of values ​​of the ratio of the total optical system length TTL of the zoom lens to the moving distance D3 of the second magnification lens group 30, the zoom lens can have a smaller total optical system length while satisfying the moving distances of the first magnification lens group 20 and the second magnification lens group 30, thereby further reducing the size of the zoom lens, and further enabling the zoom lens to meet the requirements of high-quality imaging and a larger magnification range, while being suitable for more application scenarios.

[0132] It is understandable that, in the embodiments of the present invention, each lens group may be composed of at least one lens with optical power, that is, the number of lenses with optical power in each lens group may be 1 or any integer greater than 1. Under the premise of being able to achieve the core invention of the embodiments of the present invention, the embodiments of the present invention do not specifically limit the number of lenses with optical power in each lens group. The following is an exemplary description of the specific structure of each lens group in the zoom lens provided by the embodiments of the present invention based on a typical example.

[0133] Optionally, the first fixed lens group 10 includes a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power, and a fifth lens L5 with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side.

[0134] Optionally, the object side surface of the first lens L1 is convex, that is, the first lens L1 can be a convex-concave lens or a convex-convex lens; the object side surface of the second lens L2 is convex, and the image side surface is concave, that is, the second lens L2 is a convex-concave lens; the object side surface of the third lens L3 is convex, and the image side surface is concave, that is, the third lens L3 is a convex-concave lens; the object side surface of the fourth lens L4 is convex, and the image side surface is concave, that is, the fourth lens L4 is a convex-concave lens; the object side surface of the fifth lens L5 is convex, and the image side surface is concave, that is, the fifth lens L5 is a convex-concave lens. Such an arrangement can make the light from the object side enter the first fixed lens group 10 and can smoothly pass through each lens of the first fixed lens group 10, thereby effectively reducing optical distortion and improving imaging quality.

[0135] Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all glass spherical lenses.

[0136] Among them, the light-reflecting ability of the lens made of glass material is relatively strong. By setting the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 as glass spherical lenses, it is helpful to reduce the number of lenses, thereby reducing the volume of the zoom lens. At the same time, the glass lens has a high resistance to high and low temperatures. By setting the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 as glass spherical lenses, it is beneficial to the application of the zoom lens in high or low temperature environments. It can be understood that the material of the glass spherical lens is various types of glass known to those skilled in the art, and the embodiments of the present invention do not elaborate on this or limit it.

[0137] In this embodiment, the first fixed lens group 10 can be composed of five lenses with optical focal lengths. By reasonably allocating the optical focal lengths of the five lenses, the optical focal length of the first fixed lens group 10 can be made positive, thereby ensuring that the zoom lens has a larger aperture and a larger field of view. In addition, by reasonably allocating the optical focal lengths of the lenses in the first fixed lens group 10, it can be ensured that after light enters from the first lens L1, it can pass smoothly through the subsequent lenses, thereby meeting high-quality imaging requirements.

[0138] Optionally, the first lens L1 and the second lens L2 form a cemented lens.

[0139] Among them, by forming a cemented lens with the first lens L1 and the second lens L2, the air gap between the first lens L1 and the second lens L2 can be effectively reduced, which is conducive to further reducing the optical system assembly of the zoom lens; in addition, the cemented lens formed by the first lens L1 and the second lens L2 can minimize or eliminate chromatic aberration, so that various aberrations of the zoom lens can be fully corrected, and under the premise of compact structure, the resolution can be improved, the optical performance such as distortion can be optimized, and the light loss caused by reflection between lenses can be reduced, and the illumination can be increased, thereby improving the image quality and the clarity of the lens imaging. In addition, after the first lens L1 and the second lens L2 are formed into a cemented lens, the assembly components between the lenses can be reduced, the assembly procedures in the lens manufacturing process can be simplified, the cost can be reduced, and the tolerance sensitivity problems such as tilt / eccentricity of the lens unit caused by the assembly process can be reduced.

[0140] Optionally, the focal length f1 of the cemented lens formed by the first lens L1 and the second lens L2 satisfies: 369.802≤|f1 / FW|≤664.378.

[0141] Optionally, the focal length f1 of the cemented lens formed by the first lens L1 and the second lens L2 satisfies: 11.930≤|f1 / FT|≤12.674.

[0142] In this way, by setting the focal length range of the cemented lens composed of the first lens L1 and the second lens L2, the light from the object side can be smoothly collected into the optical system of the zoom lens, so that high-order aberrations can be corrected to a great extent.

[0143] Optionally, the focal length f1 of the cemented lens composed of the first lens L1 and the second lens L2 may also satisfy: 62.583≤|f1 / (FT / FW)|≤113.731. In this way, the zoom lens can achieve a high magnification greater than 40 times while satisfying the characteristic of a small size of the zoom lens.

[0144] Optionally, the first variable power lens group 20 includes a sixth lens L6 with negative optical power, a seventh lens L7 with negative optical power, and an eighth lens L8 with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0145] Optionally, the object-side surface of the sixth lens L6 is convex, and the image-side surface is concave, that is, the sixth lens L6 is a convex-concave lens; the object-side surface of the seventh lens L7 is concave, and the image-side surface is concave, that is, the seventh lens L7 is a concave-concave lens; the object-side surface of the eighth lens L8 is convex, and the image-side surface is convex, that is, the eighth lens L8 is a convex-convex lens.

[0146] Optionally, the seventh lens L7 is a glass aspherical lens; the sixth lens L6 and the eighth lens L8 are both glass spherical lenses.

[0147] In this way, by using a spherical lens in combination with an aspherical lens, with the aspherical lens located between the two spherical lenses, high-order aberrations can be corrected well, which is beneficial to improving imaging quality; at the same time, both the aspherical lens and the spherical lens are glass lenses, which is beneficial to the application of zoom lenses in high and low temperature environments.

[0148] In an optional embodiment, the refractive index Nd7 and the Abbe number Vd7 of the seventh lens L7 satisfy: 1.45≤Nd7≤1.55; 40.00≤Vd7≤95.00.

[0149] In this embodiment, the first zoom lens group 20 is composed of three lenses with optical focal lengths. By reasonably allocating the optical focal lengths of the three lenses, the optical focal length of the first zoom lens group 20 is made negative, ensuring that light can smoothly pass through each lens of the first zoom lens group 20, thereby meeting high-quality imaging requirements.

[0150] Optionally, the second zoom lens group 30 includes a ninth lens L9 with positive optical power, a tenth lens L10 with positive optical power, an eleventh lens L11 with negative optical power, and a twelfth lens L12 with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side.

[0151] Optionally, the object-side surface of the ninth lens L9 is convex, and the image-side surface is convex, that is, the ninth lens L9 is a convex-convex lens; the object-side surface of the tenth lens L10 is convex, that is, the tenth lens L10 can be a convex-convex lens or a convex-concave lens; the object-side surface of the eleventh lens L11 is concave, and the image-side surface is concave, that is, the eleventh lens L11 is a concave-concave lens; the object-side surface of the twelfth lens L12 is convex, and the image-side surface is concave, that is, the twelfth lens L12 is a convex-concave lens.

[0152] Optionally, the tenth lens L10 and the eleventh lens L11 form a cemented lens.

[0153] Among them, by forming a cemented lens with the tenth lens L10 and the eleventh lens L11, the air space between the tenth lens L10 and the eleventh lens L11 can be effectively reduced, which is conducive to further reducing the optical system assembly of the zoom lens; in addition, the cemented lens formed by the tenth lens L10 and the eleventh lens L11 can minimize or eliminate chromatic aberration, so that various aberrations of the zoom lens can be fully corrected, and under the premise of compact structure, the resolution can be improved, the optical performance such as distortion can be optimized, and the light loss caused by reflection between lenses can be reduced, and the illumination can be increased, thereby improving the image quality and the clarity of the lens imaging. In addition, after the tenth lens L10 and the eleventh lens L11 form a cemented lens, the assembly parts between the lenses can be reduced, the assembly procedure in the lens manufacturing process can be simplified, the cost can be reduced, and the tolerance sensitivity problems such as tilt / eccentricity of the lens unit caused by the assembly process can be reduced.

[0154] Optionally, the twelfth lens L12 is a glass aspherical lens; the ninth lens L9, the tenth lens L10 and the eleventh lens L11 are all glass spherical lenses.

[0155] In this way, by using a spherical lens in combination with an aspherical lens, high-order aberrations can be well corrected, which is beneficial to improving imaging quality; at the same time, both the aspherical lens and the spherical lens are glass lenses, which is beneficial to the application of zoom lenses in high and low temperature environments.

[0156] Optionally, the refractive index Nd12 and the Abbe number Vd12 of the twelfth lens L12 satisfy: 1.45≤Nd12≤1.55; 40.00≤Vd12≤95.00.

[0157] In this embodiment, the second zoom lens group 30 is composed of four lenses with optical focal lengths. By reasonably allocating the optical focal lengths of the four lenses, the optical focal length of the second zoom lens group 30 is positive, ensuring that light can smoothly pass through each lens of the second zoom lens group 30, thereby meeting high-quality imaging requirements.

[0158] Optionally, the focusing lens group 40 includes a thirteenth lens L13 with positive optical power and a fourteenth lens L14 with negative optical power, which are arranged in sequence from the object side to the image side along the optical axis.

[0159] Optionally, the object side surface of the thirteenth lens L13 is convex, and the image side surface is convex, that is, the thirteenth lens L13 is a meniscus lens; the object side surface of the fourteenth lens L14 is concave, and the image side surface is convex, that is, the fourteenth lens L14 is a meniscus lens.

[0160] Optionally, the thirteenth lens L13 is a glass aspherical lens; the fourteenth lens L14 is a glass spherical lens. In this way, by using a spherical lens in combination with an aspherical lens, high-order aberrations can be well corrected, thereby improving the imaging quality; at the same time, both the aspherical lens and the spherical lens are glass lenses, which is conducive to the application of zoom lenses in high and low temperature environments.

[0161] Optionally, the refractive index Nd13 and the Abbe number Vd13 of the thirteenth lens satisfy: 1.45≤Nd13≤1.55; 40.00≤Vd13≤95.00.

[0162] In this embodiment, the focusing lens group 40 is composed of two lenses with optical focal lengths. By reasonably allocating the optical focal lengths of the two lenses, the optical focal length of the focusing lens group 40 is made positive, ensuring that light can smoothly pass through each lens of the focusing lens group 40, thereby meeting high-quality imaging requirements.

[0163] Optionally, the second fixed lens group 50 includes a fifteenth lens L15 with negative optical power.

[0164] Optionally, the image side surface of the fifteenth lens L15 is concave, and the object side surface is convex, that is, the fifteenth lens L15 is a meniscus lens. Such a configuration can better shrink the light, so that a clear image can be formed when the light reaches the imaging surface.

[0165] Optionally, the fifteenth lens L15 is a glass aspherical lens. Thus, by providing the fifteenth lens L15, high-order aberrations, such as geometric aberrations, can be corrected, thereby facilitating improving the imaging quality of the zoom lens.

[0166] Optionally, the refractive index Nd15 and the Abbe number Vd15 of the fifteenth lens satisfy: 1.45≤Nd15≤1.75; 20.00≤Vd15≤55.00.

[0167] In this embodiment, the second fixed lens group 50 is composed of a lens with optical power, that is, it is composed of a fifteenth lens L15 with negative optical power. The fifteenth lens L15 is combined with each lens in other lens groups to ensure smooth transmission of light and meet the requirements of high imaging quality.

[0168] In summary, the zoom lens provided in the embodiment of the present invention can be composed of fifteen lenses with optical power, among which five lenses are glass aspherical lenses and ten lenses are glass spherical lenses. By combining the glass spherical lens with the glass aspherical lens and reasonably allocating the optical power of each lens, the zoom lens provided in the embodiment of the present invention can have the characteristics of large aperture, large magnification, long focal length, small distortion and small size, meet the high-quality imaging requirements, and thus can be suitable for more application scenarios.

[0169] In an exemplary embodiment, Table 1 describes in detail the parameters of each lens group in the zoom lens provided by the embodiment of the present invention in a feasible implementation manner. The zoom lens in Table 1 corresponds to Figures 1 to 3 Zoom lens shown.

[0170] Table 1 A parameter design of each lens group in the zoom lens

[0171]

[0172] Table 2 describes in detail, in a feasible manner, specific optical and physical parameters of each lens in the zoom lens provided by the embodiment of the present invention. Table 2 corresponds to the zoom lens represented by Table 1.

[0173] Table 2 Design value of an optical physical parameter of each lens in the zoom lens

[0174]

[0175] like Figures 1 to 3The zoom lens provided in this embodiment is composed of fifteen lenses with optical power and other structures without optical power, that is, the zoom lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an aperture 60, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15 and a flat glass L16, which are arranged in sequence along the optical axis from the object side to the image side. L2, the third lens L3, the fourth lens L4 and the fifth lens L5 constitute a first fixed lens group 10, the sixth lens L6, the seventh lens L7 and the eighth lens L8 constitute a first variator lens group 20, the ninth lens L9, the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 constitute a second variator lens group 30; the thirteenth lens L13 and the fourteenth lens L14 constitute a focusing lens group 40, and the fifteenth lens L15 constitutes a second fixed lens group 50; the first lens L1 and the second lens L2 constitute a cemented lens, and the tenth lens L10 and the eleventh lens L11 constitute a cemented lens.

[0176] Among them, the surface numbers are numbered according to the order of the surfaces of each lens. For example, surface number 1 represents the object side surface of the first lens L1, surface number 2 represents the bonding surface of the first lens L1 and the second lens L2, and so on; the radius of curvature represents the curvature of the lens surface, in mm, a positive value represents that the surface is bent toward the image side, a negative value represents that the surface is bent toward the object side, and "INF" means that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, in mm; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, a 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; the semi-aperture is the effective radius of the lens surface, in mm.

[0177] Table 3 shows different zoom intervals of the zoom lens at the wide-angle end, the medium focal end and the long focal end in a feasible embodiment. Table 3 corresponds to the zoom lens shown in Table 1.

[0178] Table 3 A zoom interval design value of zoom lens

[0179]

[0180] The aspherical surface shape equation z of the aspherical lens in the zoom lens of this embodiment can be expressed in any feasible way. For example, z can satisfy the following formula:

[0181]

[0182] Wherein, r represents the vertical distance from the optical axis, z is the distance vector height from the vertex of the aspheric surface at position r along the direction perpendicular 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; A, B, C, D, E, F and G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th and 16th order terms of the aspheric polynomial respectively.

[0183] Exemplarily, Table 4 describes in detail the aspheric coefficients of each lens in a zoom lens of this embodiment in a feasible implementation manner.

[0184] Table 4 Design value of an aspheric coefficient of each lens in the zoom lens

[0185]

[0186] Among them, -5.050393E-04 means that the coefficient A of face number 13 is -5.050393×10 -4 , and so on.

[0187] Based on the above parameter design, the technical indicators of the zoom lens provided in this embodiment are shown in Table 5.

[0188] Table 5 Technical specifications of a zoom lens

[0189]

[0190] In this embodiment, Figure 4 for Figure 1 The field curvature distortion diagram of the zoom lens at the wide-angle end is shown in the figure. Figure 4 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Figure 4 It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Figure 4 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0191] Figures 5 to 7 for Figure 1 The light fan diagram of the zoom lens at the wide-angle end is shown in the figure. Figures 5 to 7As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figures 5 to 7 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0192] Figure 8 for Figure 1 The vertical axis chromatic aberration diagram of the zoom lens at the wide-angle end is shown in the figure. Figure 8 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Figure 8 It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0193] Fig. 9 for Figure 1 The axial aberration diagram of the zoom lens at the wide-angle end is shown in the figure. Fig. 9 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig. 9 It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled.

[0194] Fig.10 for Figure 2 The field curvature distortion diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.10 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.10It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.10 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0195] Figures 11 to 13 for Figure 2 The light fan diagram of the zoom lens at the mid-focus end is shown in the figure. Figures 11 to 13 As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figures 11 to 13 It can be seen that each wavelength (specifically 436 nm, 486 nm, 546 nm, 588 nm, and 656 nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0196] Fig.14 for Figure 2 The vertical axis chromatic aberration diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.14 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.14 It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0197] Fig.15 for Figure 2 The axial aberration diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.15 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.15It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the mid-focus end is well controlled.

[0198] Fig.16 for Figure 3 The field curvature distortion diagram of the zoom lens at the telephoto end is shown in the figure. Fig.16 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.16 It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.16 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0199] Figures 17 to 19 for Figure 3 The light fan diagram of the zoom lens at the telephoto end is shown in the figure. Figures 17 to 19 As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figures 17 to 19 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0200] Fig. 20 for Figure 3 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown in the figure. Fig. 20 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig. 20It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0201] Fig.21 for Figure 3 The axial aberration diagram of the zoom lens at the telephoto end is shown in the figure. Fig.21 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.21 It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the telephoto end is well controlled.

[0202] In another exemplary embodiment, Table 6 describes in detail the parameters of each lens group in the zoom lens provided by the embodiment of the present invention in another feasible implementation manner. The zoom lens in Table 6 corresponds to Figure 22 to Figure 24 Zoom lens shown.

[0203] Table 6 Another parameter design of each lens group in the zoom lens

[0204]

[0205] Table 7 describes in detail the specific optical and physical parameters of each lens in the zoom lens provided by the embodiment of the present invention in another feasible manner. Table 7 corresponds to the zoom lens represented by Table 6.

[0206] Table 7 Design values ​​of another optical physical parameter of each lens in the zoom lens

[0207]

[0208] like Figure 22 to Figure 24The zoom lens provided in this embodiment is composed of fifteen lenses with optical power and other structures without optical power, that is, the zoom lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an aperture 60, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15 and a flat glass L16, which are arranged in sequence along the optical axis from the object side to the image side. L2, the third lens L3, the fourth lens L4 and the fifth lens L5 constitute a first fixed lens group 10, the sixth lens L6, the seventh lens L7 and the eighth lens L8 constitute a first variator lens group 20, the ninth lens L9, the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 constitute a second variator lens group 30; the thirteenth lens L13 and the fourteenth lens L14 constitute a focusing lens group 40, and the fifteenth lens L15 constitutes a second fixed lens group 50; the first lens L1 and the second lens L2 constitute a cemented lens, and the tenth lens L10 and the eleventh lens L11 constitute a cemented lens.

[0209] Among them, the surface numbers are numbered according to the order of the surfaces of each lens. For example, surface number 1 represents the object side surface of the first lens L1, surface number 2 represents the bonding surface of the first lens L1 and the second lens L2, and so on; the radius of curvature represents the curvature of the lens surface, in mm, a positive value represents that the surface is bent toward the image side, a negative value represents that the surface is bent toward the object side, and "INF" means that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, in mm; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, a 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; the semi-aperture is the effective radius of the lens surface, in mm.

[0210] Table 8 shows different zoom intervals of the zoom lens at the wide-angle end, the medium focal end and the telephoto end in another feasible embodiment. Table 8 corresponds to the zoom lens shown in Table 6.

[0211] Table 8 Another zoom interval design value of zoom lens

[0212]

[0213] The aspherical surface shape equation z of the aspherical lens in the zoom lens of this embodiment can be expressed in any feasible way. For example, z can satisfy the following formula:

[0214]

[0215] Wherein, r represents the vertical distance from the optical axis, z is the distance vector height from the vertex of the aspheric surface at position r along the direction perpendicular 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; A, B, C, D, E, F and G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th and 16th order terms of the aspheric polynomial respectively.

[0216] Exemplarily, Table 9 describes in detail the aspheric coefficients of each lens in a zoom lens of this embodiment in another feasible implementation manner.

[0217] Table 9 Design values ​​of another aspheric coefficient of each lens in the zoom lens

[0218]

[0219] Among them, -5.051577E-04 means that the coefficient A of face number 13 is -5.051577×10 -4 , and so on.

[0220] Based on the above parameter design, the technical indicators of the zoom lens provided in this embodiment are shown in Table 10.

[0221] Table 10 Technical specifications of another zoom lens

[0222]

[0223] In this embodiment, Fig.25 for Fig. 22 The field curvature distortion diagram of the zoom lens at the wide-angle end is shown in the figure. Fig.25 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.25 It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.25 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0224] Figure 26 to Figure 28 for Fig. 22 The light fan diagram of the zoom lens at the wide-angle end is shown in the figure. Figure 26 to Figure 28As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figure 26 to Figure 28 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0225] Fig.29 for Fig. 22 The vertical axis chromatic aberration diagram of the zoom lens at the wide-angle end is shown in the figure. Fig.29 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.29 It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0226] Fig.30 for Fig. 22 The axial aberration diagram of the zoom lens at the wide-angle end is shown in the figure. Fig.30 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.30 It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled.

[0227] Fig.31 for Fig.23 The field curvature distortion diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.31 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.31It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.31 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0228] Figure 32 to Figure 34 for Fig.23 The light fan diagram of the zoom lens at the mid-focus end is shown in the figure. Figure 32 to Figure 34 As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figure 32 to Figure 34 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0229] Fig.35 for Fig.23 The vertical axis chromatic aberration diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.35 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.35 It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0230] Fig.36 for Fig.23 The axial aberration diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.36 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.36It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the mid-focus end is well controlled.

[0231] Fig.37 for Fig.24 The field curvature distortion diagram of the zoom lens at the telephoto end is shown in the figure. Fig.37 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.37 It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.37 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0232] Figures 38 to 40 for Fig.24 The light fan diagram of the zoom lens at the telephoto end is shown in the figure. Figures 38 to 40 As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figures 38 to 40 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0233] Fig.41 for Fig.24 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown in the figure. Fig.41 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.41It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0234] Fig.42 for Fig.24 The axial aberration diagram of the zoom lens at the telephoto end is shown in the figure. Fig.42 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.42 It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the telephoto end is well controlled.

[0235] In another exemplary embodiment, Table 11 describes in detail the parameters of each lens group in the zoom lens provided by the embodiment of the present invention in another feasible implementation manner. The zoom lens in Table 11 corresponds to Figure 43 to Figure 45 Zoom lens shown.

[0236] Table 11 Another parameter design of each lens group in the zoom lens

[0237]

[0238] Table 12 describes in detail the specific optical and physical parameters of each lens in the zoom lens provided by the embodiment of the present invention in another feasible manner. Table 12 corresponds to the zoom lens represented by Table 11.

[0239] Table 12 Design values ​​of another optical physical parameter of each lens in the zoom lens

[0240]

[0241] like Figure 43 to Figure 45The zoom lens provided in this embodiment is composed of fifteen lenses with optical power and other structures without optical power, that is, the zoom lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, an aperture 60, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15 and a flat glass L16, which are arranged in sequence along the optical axis from the object side to the image side. L2, the third lens L3, the fourth lens L4 and the fifth lens L5 constitute a first fixed lens group 10, the sixth lens L6, the seventh lens L7 and the eighth lens L8 constitute a first variator lens group 20, the ninth lens L9, the tenth lens L10, the eleventh lens L11 and the twelfth lens L12 constitute a second variator lens group 30; the thirteenth lens L13 and the fourteenth lens L14 constitute a focusing lens group 40, and the fifteenth lens L15 constitutes a second fixed lens group 50; the first lens L1 and the second lens L2 constitute a cemented lens, and the tenth lens L10 and the eleventh lens L11 constitute a cemented lens.

[0242] Among them, the surface numbers are numbered according to the order of the surfaces of each lens. For example, surface number 1 represents the object side surface of the first lens L1, surface number 2 represents the bonding surface of the first lens L1 and the second lens L2, and so on; the radius of curvature represents the curvature of the lens surface, in mm, a positive value represents that the surface is bent toward the image side, a negative value represents that the surface is bent toward the object side, and "INF" means that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, in mm; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, a 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; the semi-aperture is the effective radius of the lens surface, in mm.

[0243] Table 13 shows different zoom intervals of the zoom lens at the wide-angle end, the medium focal end and the telephoto end in yet another feasible embodiment. Table 13 corresponds to the zoom lens represented by Table 11.

[0244] Table 13 Another zoom interval design value of zoom lens

[0245]

[0246] The aspherical surface shape equation z of the aspherical lens in the zoom lens of this embodiment can be expressed in any feasible way. For example, z can satisfy the following formula:

[0247]

[0248] Wherein, r represents the vertical distance from the optical axis, z is the distance vector height from the vertex of the aspheric surface at position r along the direction perpendicular 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; A, B, C, D, E, F and G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th and 16th order terms of the aspheric polynomial respectively.

[0249] Exemplarily, Table 14 describes in detail the aspheric coefficients of each lens in a zoom lens of this embodiment in another feasible implementation manner.

[0250] Table 14 Design values ​​of aspheric coefficients of each lens in zoom lens

[0251]

[0252] Among them, -5.014924E-04 means that the coefficient A of the face number 13 is -5.014924×10 -4 , and so on.

[0253] Based on the above parameter design, the technical indicators of the zoom lens provided in this embodiment are shown in Table 15.

[0254] Table 15 Technical specifications of another zoom lens

[0255]

[0256] In this embodiment, Fig.46 for Fig.43 The field curvature distortion diagram of the zoom lens at the wide-angle end is shown in the figure. Fig.46 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.46 It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.46 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0257] Figure 47 to Figure 49 for Fig.43 The light fan diagram of the zoom lens at the wide-angle end is shown in the figure. Figure 47 to Figure 49As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figure 47 to Figure 49 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0258] Fig.50 for Fig.43 The vertical axis chromatic aberration diagram of the zoom lens at the wide-angle end is shown in the figure. Fig.50 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.50 It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0259] Fig.51 for Fig.43 The axial aberration diagram of the zoom lens at the wide-angle end is shown in the figure. Fig.51 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.51 It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled.

[0260] Fig.52 for Fig.44 The field curvature distortion diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.52 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.52It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.52 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0261] Figure 53 to Figure 55 for Fig.44 The light fan diagram of the zoom lens at the mid-focus end is shown in the figure. Figure 53 to Figure 55 As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figure 53 to Figure 55 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0262] Fig.56 for Fig.44 The vertical axis chromatic aberration diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.56 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.56 It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0263] Fig.57 for Fig.44 The axial aberration diagram of the zoom lens at the mid-focus end is shown in the figure. Fig.57 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.57It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the mid-focus end is well controlled.

[0264] Fig.58 for Fig.45 The field curvature distortion diagram of the zoom lens at the telephoto end is shown in the figure. Fig.58 As shown in the figure, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, the unit is mm; the vertical coordinate represents the normalized image height, no unit; T represents the meridian, S represents the arc loss; Fig.58 It can be seen that the zoom lens provided in this embodiment is effectively controlled in terms of field curvature, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of the distortion, in units of %; the vertical coordinate represents the normalized image height, in units of %. Fig.58 It can be seen that the distortion of the zoom lens provided in this embodiment is well corrected, and the imaging distortion is small.

[0265] Figure 59 to Figure 61 for Fig.45 The light fan diagram of the zoom lens at the telephoto end is shown in the figure. Figure 59 to Figure 61 As shown in the figure, the horizontal axis is the beam aperture and the vertical axis is the vertical axis aberration. The most ideal curve is a straight line that coincides with the horizontal axis, indicating that all light rays converge at the same point on the image plane. The corresponding interval on the vertical axis of the curve is 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 vertical axis chromatic aberration. Figure 59 to Figure 61 It can be seen that each wavelength (specifically 436nm, 486nm, 546nm, 588nm, and 656nm) of the zoom lens in each field of view is close to the horizontal axis, indicating that the vertical axis aberration of each wavelength of the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the system is also well corrected, thereby ensuring that the zoom lens can achieve high-resolution imaging requirements.

[0266] Fig.62 for Fig.45 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown in the figure. Fig.62 As shown in the vertical axis chromatic aberration curve, the vertical direction represents the normalization of the field of view, and 0 represents the optical axis; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.62It can be seen that the vertical chromatic aberration of different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) is all controlled within a good range, indicating that the vertical chromatic aberration of the zoom lens at the wide-angle end is well controlled and can meet the needs of wide spectrum applications.

[0267] Fig.63 for Fig.45 The axial aberration diagram of the zoom lens at the telephoto end is shown in the figure. Fig.63 As shown in the axial aberration curve, the vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius; the main wavelength uses 546nm, and the horizontal direction represents the offset relative to the main wavelength in millimeters (mm). Fig.63 It can be seen that the axial aberrations of normalized apertures at different wavelengths (specifically 436.0nm, 486.1nm, 546.0nm, 587.6nm, and 656.3nm) are all controlled within a reasonable range, indicating that the vertical chromatic aberration of the zoom lens at the telephoto end is well controlled.

[0268] 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 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: include: A first fixed lens group with positive power, a first variable power lens group with negative power, an aperture, a second variable power lens group with positive power, a focusing lens group with positive power, and a second fixed lens group with negative power are arranged in sequence along the optical axis from the object side to the image side; The first variable-power lens group, the second variable-power lens group and the focusing lens group are all movably arranged between the first fixed lens group and the second fixed lens group; When the first zoom lens group and the second zoom lens group move in coordination along the direction of the optical axis, the zoom lens can be zoomed; when the focus lens group moves along the direction of the optical axis, the zoom lens can be zoomed; The first fixed lens group consists of a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side; The first variable power lens group is composed of a sixth lens with negative optical power, a seventh lens with negative optical power, and an eighth lens with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side; The second variable power lens group is composed of a ninth lens with positive optical power, a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side; The focusing lens group is composed of a thirteenth lens with positive focal power and a fourteenth lens with negative focal power, which are arranged in sequence from the object side to the image side along the optical axis; The second fixed lens group is composed of a fifteenth lens with negative optical power; The focal length FW of the zoom lens at the wide-angle end and the optical distortion DIS1 of the zoom lens at the wide-angle end satisfy: 0.664≤|FW / DIS1|≤1.927; The focal length FT of the zoom lens at the telephoto end and the optical distortion DIS2 of the zoom lens at the telephoto end satisfy: 440.556≤|FT / DIS2|≤8569.115; The focal length G1 of the first fixed lens group, the focal length G2 of the first variable-power lens group, the focal length G3 of the second variable-power lens group, the focal length G4 of the focusing lens group, and the focal length G5 of the second fixed lens group satisfy: 7.952≤G1 / FW≤14.532; -1.407≤G2 / FW≤-2.512; 4.019≤G3 / FW≤7.625; 2.498≤G4 / FW≤4.877; -8.951≤G5 / FW≤-51.

307.

2. The zoom lens according to claim 1, wherein: 29.948≤FT / FW≤49.

373.

3. The zoom lens according to claim 1, wherein: The maximum movable distance D2 of the first variator lens group, the maximum movable distance D3 of the second variator lens group, and the maximum movable distance D4 of the focus lens group satisfy: 4.806≤|D2 / D4|≤6.510; 0.799≤|D3 / D4|≤3.

897.

4. The zoom lens according to claim 1, wherein: The total optical system length TTL of the zoom lens, the moving distance D2 of the first variator lens group, and the moving distance D3 of the second variator lens group satisfy: 2.871≤|TTL / D2|≤3.253; 3.711≤|TTL / D3|≤11.

410.

5. The zoom lens according to claim 1, wherein: The first lens and the second lens form a cemented lens.

6. The zoom lens according to claim 5, wherein: The focal length f1 of the cemented lens composed of the first lens and the second lens satisfies: 369.802≤|f1 / FW|≤664.

378.

7. The zoom lens according to claim 5, characterized in that: The focal length f1 of the cemented lens composed of the first lens and the second lens satisfies: 11.930≤|f1 / FT|≤12.

674.

8. The zoom lens according to claim 5, wherein: The focal length f1 of the cemented lens composed of the first lens and the second lens satisfies: 62.583≤|f1 / (FT / FW)|≤113.

731.

9. The zoom lens according to claim 1, wherein: The object side surface of the first lens is a convex surface; The object side surface of the second lens is convex, and the image side surface is concave; The object side surface of the third lens is convex, and the image side surface is concave; The object side surface of the fourth lens is convex, and the image side surface is concave; The object side surface of the fifth lens is convex, and the image side surface is concave.

10. The zoom lens according to claim 1, wherein: The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses.

11. The zoom lens according to claim 1, wherein: The seventh lens is a glass aspherical lens; the sixth lens and the eighth lens are both glass spherical lenses.

12. The zoom lens according to claim 1, wherein: The object side surface of the sixth lens is convex, and the image side surface is concave; The object side surface of the seventh lens is concave, and the image side surface is concave; The object-side surface of the eighth lens is convex, and the image-side surface is convex.

13. The zoom lens according to claim 1, wherein: The refractive index Nd7 and the Abbe number Vd7 of the seventh lens satisfy: 1.45≤Nd7≤1.55; 40.00≤Vd7≤95.

00.

14. The zoom lens according to claim 1, wherein: The tenth lens and the eleventh lens form a cemented lens.

15. The zoom lens according to claim 1, wherein: The twelfth lens is a glass aspherical lens; the ninth lens, the tenth lens and the eleventh lens are all glass spherical lenses.

16. The zoom lens according to claim 1, wherein: The object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface; The object side surface of the tenth lens is a convex surface; The object side surface of the eleventh lens is a concave surface, and the image side surface is a concave surface; The object side surface of the twelfth lens is convex, and the image side surface is concave.

17. The zoom lens according to claim 1, wherein: The refractive index Nd12 and the Abbe number Vd12 of the twelfth lens satisfy: 1.45≤Nd12≤1.55; 40.00≤Vd12≤95.

00.

18. The zoom lens according to claim 1, wherein: The thirteenth lens is a glass aspherical lens; the fourteenth lens is a glass spherical lens.

19. The zoom lens according to claim 1, wherein: The object side surface of the thirteenth lens is convex, and the image side surface is convex; The object side surface of the fourteenth lens is concave, and the image side surface is convex.

20. The zoom lens according to claim 1, wherein: The refractive index Nd13 and the Abbe number Vd13 of the thirteenth lens satisfy: 1.45≤Nd13≤1.55; 40.00≤Vd13≤95.

00.

21. The zoom lens according to claim 1, wherein: The fifteenth lens is a glass aspherical lens.

22. The zoom lens according to claim 1, wherein: The image side surface of the fifteenth lens is concave, and the object side surface is convex.

23. The zoom lens according to claim 1, wherein: The refractive index Nd15 and the Abbe number Vd15 of the fifteenth lens satisfy: 1.45≤Nd15≤1.75; 20.00≤Vd15≤55.00.

Images