Deformable lens

Abstract

The utility model discloses a deformable lens, which comprises a first spherical lens group, a second spherical lens group, a first cylindrical lens group, a third spherical lens group, a second cylindrical lens group, a fourth spherical lens group and a twentieth lens which are sequentially arranged from an object space to an image space, the focal lengths of all the lens groups meet the following conditions: 1.4 lt; f (G1-G7) Y / f (G1-G7) Xlt; 1.6); 1lt; 1lt; f (G2) X / f (G1-G4) Xlt; -0.7,-0.7; -2lt;-2lt; f (G3) X / f (G1-G4) Xlt; -1.3,-1.3; 361t; 361t; f (G5) Y / f (G5-G7) Ylt; 24); 0.8 lt; f (G1-G4) X / f (G5-G7) Xlt; 1.2; 1.1 lt; 1.1 lt; f (G1-G4) Y / f (G5-G7) Ylt; and 1.7. The integrated design is adopted, so that the lens is small in size, and meanwhile, the optical performance of high resolution, low respiration, low distortion, 1.5 X high magnification and the like is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, and particularly relates to a deformable lens. Background Art

[0002] With the rapid development of Internet technology, taking pictures and videos has become an essential part of the lives of ordinary consumers. In recent years, with the promotion of technologies such as 5G, there have been more and more video sharing such as Vlogs, and there are more and more people using tools such as mobile phones and cameras to shoot short films and micro movies.

[0003] However, at present, the conventional shooting ratio of devices such as mobile phones, tablet computers, and cameras on the market is 16:9, while the ratio of wide-screen videos with a cinematic feel is 2.4:1. At the same time, good micro movie or video shooting requires the cooperation of different focal length lenses. In particular, a medium and long focal length deformable lens is required for close-ups of people.

[0004] Existing deformable lenses have technical problems such as high price, large volume and weight, large breathing effect, and non-constant magnification. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the technical problems of high price, large volume and weight, large breathing effect, and non-constant magnification existing in the deformable lens in the prior art, so as to provide a deformable lens.

[0006] To solve the above technical problems, the technical solution of the utility model is as follows:

[0007] A deformable lens includes a first spherical lens group, a second spherical lens group, a first cylindrical lens group, a third spherical lens group, a second cylindrical lens group, a fourth spherical lens group, and a twentieth lens, which are sequentially arranged along the optical path from the object side to the image side;

[0008] The first spherical lens group has a negative optical power, the second spherical lens group has a negative optical power, the first cylindrical lens group has a negative optical power, the third spherical lens group has a positive optical power, the second cylindrical lens group has a negative optical power, and the fourth spherical lens group has a positive optical power;

[0009] The combined optical focal length of all lens groups satisfies the following conditional formula:

[0010] 1.4 < f(G1~G7)Y / f(G1~G7)X < 1.6;

[0011] -1 < f(G2)X / f(G1~G4)X < -0.7;

[0012] -2 < f(G3)X / f(G1~G4)X < -1.3;

[0013] -36 < f(G5)Y / f(G5~G7)Y < -24;

[0014] 0.8 < f(G1~G4)X / f(G5~G7)X < 1.2;

[0015] 1.1 < f(G1~G4)Y / f(G5~G7)Y < 1.7;

[0016] Wherein, the curvature direction of the first cylindrical lens group is the X direction, and the Y direction is the direction perpendicular to the X direction; f(G1~G7)Y is the comprehensive optical focal length of the first spherical lens group to the aspherical lens group in the Y direction, f(G1~G7)X is the comprehensive optical focal length of the first spherical lens group to the aspherical lens group in the X direction, f(G2)X is the comprehensive optical focal length of the second spherical lens group in the X direction, f(G3)X is the comprehensive optical focal length of the first cylindrical lens group in the X direction, f(G1~G4)X is the comprehensive optical focal length of the first spherical lens group to the third spherical lens group in the X direction, f(G5)Y is the comprehensive optical focal length of the second cylindrical lens group in the Y direction, f(G5~G7)Y is the comprehensive optical focal length of the second cylindrical lens group to the aspherical lens group in the Y direction, f(G5~G7)X is the comprehensive optical focal length of the second cylindrical lens group to the aspherical lens group in the X direction, and f(G1~G4)Y is the comprehensive optical focal length of the first spherical lens group to the third spherical lens group in the Y direction.

[0017] Further, the first spherical lens group includes a first lens, a second lens, and a third lens that are sequentially arranged from the object side to the image side along the optical path and are all spherical lenses; the first lens is a spherical lens with a negative optical power, the second lens is a spherical lens with a positive optical power, and the third lens is a spherical lens with a negative optical power;

[0018] The second spherical lens group includes a fourth lens and a fifth lens that are sequentially arranged from the object side to the image side along the optical path; both the fourth lens and the fifth lens are spherical lenses with a negative optical power;

[0019] The first cylindrical lens group includes a sixth lens (6), a seventh lens, and an eighth lens that are sequentially arranged from the object side to the image side along the optical path. The sixth lens and the seventh lens are both cylindrical lenses with a negative optical power, and the eighth lens is a cylindrical lens with a positive optical power;

[0020] The third spherical lens group includes a ninth lens, a tenth lens, and an eleventh lens that are sequentially arranged from the object side to the image side along the optical path; the ninth lens and the tenth lens are both spherical lenses with a positive optical power, and the eleventh lens is a spherical lens with a negative optical power;

[0021] The second cylindrical lens group includes a twelfth lens, a thirteenth lens, and a fourteenth lens arranged in sequence along the optical path from the object side to the image side. The twelfth lens is a cylindrical lens with a positive optical power, the thirteenth lens is a cylindrical lens with a negative optical power, and the fourteenth lens is a cylindrical lens with a negative optical power;

[0022] The fourth spherical lens group includes a fifteenth lens, a sixteenth lens, a seventeenth lens, an eighteenth lens, and a nineteenth lens arranged in sequence along the optical path from the object side to the image side; the fifteenth lens, the eighteenth lens, and the nineteenth lens are all spherical lenses with positive optical powers, and the sixteenth lens and the seventeenth lens are both spherical lenses with negative optical powers;

[0023] The aspherical lens group includes a twentieth lens, and the twentieth lens is an aspherical lens.

[0024] Further, the fourth lens and the fifth lens form an internal focusing group.

[0025] Further, the tenth lens and the eleventh lens are cemented to form a doublet spherical lens, the fifteenth lens and the sixteenth lens are cemented to form a doublet spherical lens, and the seventeenth lens and the eighteenth lens are cemented to form a doublet spherical lens; the doublet spherical lenses are used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.

[0026] Further, the focal length of the anamorphic lens in the Y direction is 35 mm.

[0027] Further, the magnification ratio of the anamorphic lens is 1.5X, and the magnification at different object distances remains constant.

[0028] Further, the overall optical length of the anamorphic lens does not exceed 180 mm.

[0029] Further, the aperture of the anamorphic lens does not exceed 2.

[0030] Further, the lenses in the first spherical lens group, the second spherical lens group, the first cylindrical lens group, the third spherical lens group, the second cylindrical lens group, and the fourth spherical lens group are all optical glass lenses; the lens in the aspherical lens group is an aspherical glass lens.

[0031] The technical solution of the present utility model has the following advantages: By combining the X-direction cylindrical lens group and the spherical lens group, the optical power is reasonably distributed, making the optical structure of the anamorphic lens more compact and smaller, with lower cost. And through the comprehensive correction of light by the spherical lens group, and then using the optical characteristics of the cylindrical lens group, the light entering horizontally is "compressed", while the light entering vertically remains unchanged, thereby increasing the horizontal field of view of the lens and ensuring the performance in the X direction. Then, the Y-direction cylindrical lens group and the spherical lens group are used to stabilize the performance in the other direction. In this way, the full-frame and large magnification of the lens are achieved. In addition, the compact design of the integration of the cylindrical lens and the spherical lens makes the lens small in volume, light in weight, and greatly reduces the cost. The aspherical lens can effectively correct the spherical aberration and astigmatism of the lens, improving the resolution of the lens while reducing the volume and weight of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is the optical structure diagram of the anamorphic lens in the X direction when the object-image distance is infinite in the embodiment of the present utility model;

[0034] Figure 2 It is the optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is infinite in the embodiment of the present utility model;

[0035] Figure 3 It is the optical field curvature and distortion diagram of the anamorphic lens when the object-image distance is infinite in the embodiment of the present utility model;

[0036] Figure 4 It is the optical structure diagram of the anamorphic lens in the X direction when the object-image distance is 0.65m in the embodiment of the present utility model;

[0037] Figure 5 It is the optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is 0.65m in the embodiment of the present utility model;

[0038] Figure 6 It is the optical field curvature and distortion diagram of the anamorphic lens when the object-image distance is 0.65m in the embodiment of the present utility model.

[0039] Description of the reference numerals: G1, the first spherical lens group; G2, the second spherical lens group; G3, the first cylindrical lens group; G4, the third spherical lens group; G5, the second cylindrical lens group; G6, the fourth spherical lens group; G7, the aspherical lens group; 1, the first lens; 2, the second lens; 3, the third lens; 4, the fourth lens; 5, the fifth lens; 6, the sixth lens; 7, the seventh lens; 8, the eighth lens; 9, the ninth lens; 10, the tenth lens; 11, the eleventh lens; 12, the twelfth lens; 13, the thirteenth lens; 14, the fourteenth lens; 15, the fifteenth lens; 16, the sixteenth lens; 17, the seventeenth lens; 18, the eighteenth lens; 19, the nineteenth lens; 20, the twentieth lens. Detailed implementation manners

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] As Figure 1-6 shown, a deformable lens includes a first spherical lens group G1, a second spherical lens group G2, a first cylindrical lens group G3, a third spherical lens group G4, a second cylindrical lens group G5, a fourth spherical lens group G6, and an aspherical lens group G7, which are sequentially arranged along the optical path from the object side to the image side. Among them, the first spherical lens group G1 has a negative optical power, the second spherical lens group G2 has a negative optical power, the first cylindrical lens group G3 has a negative optical power, the third spherical lens group G4 has a positive optical power, the second cylindrical lens group G5 has a negative optical power, and the fourth spherical lens group G6 has a positive optical power; the lens of the aspherical lens group G7 is an aspherical glass lens.

[0043] The combined optical focal lengths of all lens groups satisfy the following conditional formula:

[0044] 1.4 < f(G1~G7)Y / f(G1~G7)X < 1.6;

[0045] -1 < f(G2)X / f(G1~G4)X < -0.7;

[0046] -2 < f(G3)X / f(G1~G4)X < -1.3;

[0047] -36 < f(G5)Y / f(G5~G7)Y < -24;

[0048] 0.8 < f(G1~G4)X / f(G5~G7)X < 1.2;

[0049] 1.1 < f(G1~G4)Y / f(G5~G7)Y < 1.7;

[0050] Wherein, the curvature direction of the first cylindrical lens group G3 is the X direction, and the Y direction is the direction perpendicular to X; f(G1~G7)Y is the comprehensive optical focal length of the first spherical lens group G1 to the aspherical lens group G7 in the Y direction, f(G1~G7)X is the comprehensive optical focal length of the first spherical lens group G1 to the aspherical lens group G7 in the X direction, f(G2)X is the comprehensive optical focal length of the second spherical lens group G2 in the X direction, f(G3)X is the comprehensive optical focal length of the first cylindrical lens group G3 in the X direction, f(G1~G4)X is the comprehensive optical focal length of the first spherical lens group G1 to the third spherical lens group G4 in the X direction, f(G5)Y is the comprehensive optical focal length of the second cylindrical lens group G5 in the Y direction, f(G5~G7)Y is the comprehensive optical focal length of the second cylindrical lens group G5 to the aspherical lens group G7 in the Y direction, f(G5~G7)X is the comprehensive optical focal length of the second cylindrical lens group G5 to the aspherical lens group G7 in the X direction, and f(G1~G4)Y is the comprehensive optical focal length of the first spherical lens group G1 to the third spherical lens group G4 in the Y direction.

[0051] This anamorphic lens combines and uses a cylindrical lens group and a spherical lens group in the X direction to reasonably distribute the optical power, making the optical structure of the anamorphic lens more compact and smaller, with lower cost. The spherical lens group comprehensively corrects the light, and then, using the optical characteristics of the cylindrical lens group, the light entering horizontally is "compressed", while the light entering vertically remains unchanged, thereby increasing the horizontal field of view of the lens and ensuring the performance in the X direction. The performance in the other direction is stabilized by the cylindrical lens group and the spherical lens group in the Y direction. In this way, the full-frame and large magnification of the lens are achieved. In addition, the compact design of the integration of the cylindrical lens and the spherical lens makes the lens small in volume, light in weight, and greatly reduces the cost. The aspherical lens can effectively correct the spherical aberration and astigmatism of the lens, improving the resolution of the lens while reducing the volume and weight of the lens.

[0052] In some embodiments of this embodiment, the first spherical lens group G1 includes a first lens 1, a second lens 2, and a third lens 3 arranged in sequence along the optical path from the object side to the image side; the first lens 1 is a spherical lens with negative optical power, the second lens 2 is a spherical lens with positive optical power, and the third lens 3 is a spherical lens with negative optical power.

[0053] The second spherical lens group G2 includes a fourth lens 4 and a fifth lens 5 arranged in sequence along the optical path from the object side to the image side, and the fourth lens 4 and the fifth lens 5 are spherical lenses with negative optical power.

[0054] The first cylindrical lens group G3 includes a sixth lens 6, a seventh lens 7, and an eighth lens 8 arranged in sequence along the optical path from the object side to the image side. Both the sixth lens 6 and the seventh lens 7 are spherical lenses with negative optical power, and the eighth lens 8 is a spherical lens with positive optical power.

[0055] The third spherical lens group G4 includes a ninth lens 9, a tenth lens 10, and an eleventh lens 11 arranged in sequence along the optical path from the object side to the image side. Both the ninth lens 9 and the tenth lens 10 are spherical lenses with positive optical power, and the eleventh lens 11 is a spherical lens with negative optical power.

[0056] The second cylindrical lens group G5 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 arranged in sequence along the optical path from the object side to the image side. The twelfth lens 12 is a cylindrical lens with positive optical power, the thirteenth lens 13 is a cylindrical lens with negative optical power, and the fourteenth lens 14 is a cylindrical lens with negative optical power.

[0057] The fourth spherical lens group G6 includes a fifteenth lens 15, a sixteenth lens 16, a seventeenth lens 17, an eighteenth lens 18, and a nineteenth lens 19 arranged in sequence along the optical path from the object side to the image side. The fifteenth lens 15, the eighteenth lens 18, and the nineteenth lens 19 are all spherical lenses with positive optical power, and the sixteenth lens 16 and the seventeenth lens 17 are both spherical lenses with negative optical power.

[0058] The focal length distribution of the first lens 1 to the twentieth lens 20 satisfies the following relationship: 1.4 < f(1~20)Y / f(1~20)X < 1.6;

[0059] -1 < f(4-5)X / f(1~11)X < -0.7;

[0060] -2 < f(6~8)X / f(1~11)X < -1.3;

[0061] -36 < f(12~14)Y / f(12~20)Y < -24;

[0062] 0.8 < f(1~11)X / f(12~20)X < 1.2;

[0063] 1.1 < f(1~11)Y / f(12~20)Y < 1.7;

[0064] Among them, the curvature direction of the sixth lens 6 is the X direction, and the Y direction is perpendicular to the X direction; f(m~n)Y is the combined optical focal length of the mth lens to the nth lens in the Y direction, f(m~n)X is the combined optical focal length of the mth lens to the nth lens in the X direction, m and n are both positive integers, and 1 ≤ m < n ≤ 20.

[0065] In some embodiments of this embodiment, the number of lenses in the anamorphic lens is not limited to 20 lenses, and the number of lenses in the anamorphic lens can be further changed, as long as the combined optical focal lengths of various lens groups in the anamorphic lens satisfy the above mathematical relationship.

[0066] In this embodiment, the combined optical focal length of the anamorphic lens in the Y direction is 35 mm. The zoom ratio of the anamorphic lens is 1.5X, and the magnification at different object distances remains constant. The overall optical length of the anamorphic lens does not exceed 180 mm. The aperture of the anamorphic lens does not exceed 2.

[0067] In this embodiment, the fourth lens 4 and the fifth lens 5 form an internal focusing group. When adjusting, the overall length of the lens remains unchanged, and a floating internal focusing group is used to achieve focusing from 0.65 m to infinity of the object image distance, while overcoming the technical difficulties of large breathing effect and non-constant magnification of the 35 mm anamorphic lens.

[0068] In this embodiment, the tenth lens 10 and the eleventh lens 11 are doublet spherical lenses, the fifteenth lens 15 and the sixteenth lens 16 are doublet spherical lenses, and the seventeenth lens 17 and the eighteenth lens 18 are doublet spherical lenses. The doublet spherical lenses are used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.

[0069] It should be noted that the above combination method of multiple groups of doublet spherical lenses is bonding. As an alternative embodiment, based on the concept of the present invention, in order to distinguish it from this application, after changing the above combination method, such as bonding, integral molding and other combination methods, and then making an adaptive change to the shape of the combined lens, it should also be included in the protection scope of this application. For a single lens or two consecutive lenses with the same sign of optical power, the single lens can be split into two or more lenses, or two consecutive lenses with the same sign can be combined into one lens. Such simple transformations of the optical structure of this patent, such as the optical power distribution of the transformed lens or lens group within the range of the mathematical relationship expression of this patent. On the basis of this embodiment, changes and replacements made to the number of lenses and the combination method in order to distinguish it from this application, without departing from the main idea of this application, all belong to the protection scope of this application.

[0070] In this embodiment, the lenses in the first spherical lens group G1, the second spherical lens group G2, the first cylindrical lens group G3, the third spherical lens group G4, the second cylindrical lens group G5, and the fourth spherical lens group G6 are all optical glass lenses, and the lenses in the aspherical lens group G7 are aspherical glass lenses.

[0071] See Figure 3 As shown, they are the field curvature diagram and distortion diagram of the anamorphic lens. It can be seen from the curves in the figure that the field curvature is basically less than ±0.6, ensuring the same clarity for the large field of view; the distortion is less than 5%, ensuring a small amount of deformation in the imaging picture.

[0072] Refer to Figure 4 and Figure 5 , by adjusting the internal focusing group in the anamorphic lens, the overall length of the anamorphic lens remains unchanged, and the super-close object image distance of the large magnification anamorphic lens in the full-frame is achieved to be 0.65 m. See Figure 6 As shown, they are the field curvature diagram and distortion diagram of the anamorphic lens at a short object distance. It can be seen from the curves in the figure that each field curvature is basically less than ±0.5, ensuring the same clarity for the large field of view; the distortion is less than 8%, ensuring a small amount of deformation in the imaging picture.

[0073] The following Table 1 lists the actual parameters of each lens in this embodiment that meet the above mathematical relationship:

[0074]

[0075] Table 1

[0076] The aspherical coefficients of the 20th lens 20 are as follows in the table:

[0077]

[0078] Table 2

[0079] The anamorphic lens provided by the present utility model adopts an integrated design, achieving excellent super cost-effective optical performances such as a small lens volume, high resolution, low breathing, low distortion, full-frame, and 1.5X high magnification. It can be designed to be compatible with the bayonets of various brands of cameras on the market according to actual usage requirements to achieve personalized customization and general compatibility.

[0080] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present inventive concept.

Claims

1. A variable-focus lens, characterized in that, It includes a first spherical lens group (G1), a second spherical lens group (G2), a first cylindrical lens group (G3), a third spherical lens group (G4), a second cylindrical lens group (G5), a fourth spherical lens group (G6) and an aspherical lens group (G7) arranged in sequence along the optical path from the object side to the image side; The first spherical lens group (G1) has a negative optical power, the second spherical lens group (G2) has a negative optical power, the first cylindrical lens group (G3) has a negative optical power, the third spherical lens group (G4) has a positive optical power, the second cylindrical lens group (G5) has a negative optical power, and the fourth spherical lens group (G6) has a positive optical power; the combined optical focal length of all lens groups satisfies the following conditional formula: 1.4 < f(G1~G7)Y / f(G1~G7)X < 1.6; -1 < f(G2)X / f(G1~G4)X < -0.7; -2 < f(G3)X / f(G1~G4)X < -1.3; -36 < f(G5)Y / f(G5~G7)Y < -24; 0.8 < f(G1~G4)X / f(G5~G7)X < 1.2; 1.1 < f(G1~G4)Y / f(G5~G7)Y < 1.7; Wherein, the curvature direction of the first cylindrical lens group (G3) is the X direction, and the Y direction is the direction perpendicular to X; f(G1~G7)Y is the combined optical focal length of the first spherical lens group (G1) to the aspherical lens group (G7) along the Y direction, f(G1~G7)X is the combined optical focal length of the first spherical lens group (G1) to the aspherical lens group (G7) along the X direction, f(G2)X is the combined optical focal length of the second spherical lens group (G2) along the X direction, f(G3)X is the combined optical focal length of the first cylindrical lens group (G3) along the X direction, f(G1~G4)X is the combined optical focal length of the first spherical lens group (G1) to the third spherical lens group (G4) along the X direction, f(G5)Y is the combined optical focal length of the second cylindrical lens group (G5) along the Y direction, f(G5~G7)Y is the combined optical focal length of the second cylindrical lens group (G5) to the aspherical lens group (G7) along the Y direction, f(G5~G7)X is the combined optical focal length of the second cylindrical lens group (G5) to the aspherical lens group (G7) along the X direction, and f(G1~G4)Y is the combined optical focal length of the first spherical lens group (G1) to the third spherical lens group (G4) along the Y direction.

2. The zoom lens according to claim 1, wherein The first spherical lens group (G1) includes a first lens (1), a second lens (2) and a third lens (3) arranged in sequence along the optical path from the object side to the image side; the first lens (1) is a spherical lens with a negative optical power, the second lens (2) is a spherical lens with a positive optical power, and the third lens (3) is a spherical lens with a negative optical power; The second spherical lens group (G2) includes a fourth lens (4) and a fifth lens (5) arranged in sequence along the optical path from the object side to the image side; both the fourth lens (4) and the fifth lens (5) are spherical lenses with a negative optical power; The first cylindrical lens group (G3) includes a sixth lens (6), a seventh lens (7), and an eighth lens (8) arranged in sequence along the optical path from the object side to the image side. The sixth lens (6) and the seventh lens (7) are both cylindrical lenses with negative optical power, and the eighth lens (8) is a cylindrical lens with positive optical power; The third spherical lens group (G4) includes a ninth lens (9), a tenth lens (10), and an eleventh lens (11) arranged in sequence along the optical path from the object side to the image side. The ninth lens (9) and the tenth lens (10) are both spherical lenses with positive optical power, and the eleventh lens (11) is a spherical lens with negative optical power; The second cylindrical lens group (G5) includes a twelfth lens (12), a thirteenth lens (13), and a fourteenth lens (14) arranged in sequence along the optical path from the object side to the image side. The twelfth lens (12) is a cylindrical lens with positive optical power, the thirteenth lens (13) is a cylindrical lens with negative optical power, and the fourteenth lens (14) is a cylindrical lens with negative optical power; The fourth spherical lens group (G6) includes a fifteenth lens (15), a sixteenth lens (16), a seventeenth lens (17), an eighteenth lens (18), and a nineteenth lens (19) arranged in sequence along the optical path from the object side to the image side. The fifteenth lens (15), the eighteenth lens (18), and the nineteenth lens (19) are all spherical lenses with positive optical power, and the sixteenth lens (16) and the seventeenth lens (17) are both spherical lenses with negative optical power; The aspherical lens group (G7) includes a twentieth lens (20), and the twentieth lens (20) is an aspherical lens.

3. The zoom lens according to claim 2, wherein The fourth lens (4) and the fifth lens (5) form an internal focusing group.

4. The anamorphic lens according to claim 2, characterized in that, The tenth lens (10) and the eleventh lens (11) are cemented to form a doublet spherical lens; the fifteenth lens (15) and the sixteenth lens (16) are cemented to form a doublet spherical lens; the seventeenth lens (17) and the eighteenth lens (18) are cemented to form a doublet spherical lens.

5. The anamorphic lens according to claim 1, characterized in that, The overall optical focal length of the anamorphic lens in the Y direction is 35 mm.

6. The anamorphic lens according to claim 1, wherein The zoom ratio of the anamorphic lens is 1.5X, and the magnification at different object distances remains constant.

7. The anamorphic lens according to claim 1, wherein The overall optical length of the anamorphic lens does not exceed 180 mm.

8. The anamorphic lens according to claim 1, characterized in that, The aperture of the anamorphic lens does not exceed 2.

9. The anamorphic lens according to claim 1, wherein, The lenses in the first spherical lens group (G1), the second spherical lens group (G2), the first cylindrical lens group (G3), the third spherical lens group (G4), the second cylindrical lens group (G5), and the fourth spherical lens group (G6) are all optical glass lenses; the lens in the aspherical lens group (G7) is an aspherical glass lens.

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