A widescreen anamorphic lens

Abstract

The present invention discloses a wide-screen anamorphic lens, belonging to the field of optical lenses, which includes a first cylindrical lens group, a first spherical lens group, a second spherical lens group, a second cylindrical lens group, a third cylindrical lens group, and a third spherical lens group arranged in sequence along the optical path from the object side to the image side; the focal lengths of all lens groups satisfy: 1.2 < f(G1-G6)X / f(G1-G6)Y < 1.8; -0.9 < f(G5)X / f(G1)Y < -0.3; 2.2 < f(G5)X / f(G4)Y < 3.2; -5 < f(G1)Y / f(G4)Y < -3; 0 < f(G2) / f(G6) < 0.5; -1.5 < f(G2) / f(G3) < -1; -0.2 < f(G3) / f(G6) < -0.1. By adopting an integrated design, while achieving a small lens volume, optical performances such as high resolution, low breathing, low distortion, and fixed anamorphic ratio are obtained.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more specifically to a widescreen anamorphic lens. Background Technology

[0002] With the rapid development of internet technology, taking photos and videos has become an indispensable part of ordinary consumers' lives. In recent years, driven by technologies such as 5G, video sharing such as vlogs has increased significantly, and more and more people are using mobile phones, cameras, and other tools to shoot short videos and micro-films.

[0003] However, the standard shooting ratio for mobile phones, tablets, cameras, and other devices on the market is 16:9, while the ratio for cinematic widescreen videos is 2.4:1. Furthermore, good short films or videos require lenses of different focal lengths working together, especially medium to long telephoto anamorphic lenses for close-ups of people.

[0004] Existing anamorphic lenses suffer from technical problems such as high price, large size and weight, large breathing effect and inconsistent magnification, and there are currently almost no autofocus full-frame widescreen anamorphic lenses on the market. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical problems of high price, large size and weight, large breathing effect and inconsistent magnification of existing anamorphic lenses, thereby providing a widescreen anamorphic lens.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A widescreen anamorphic lens includes a first cylindrical lens group, a first spherical lens group, a second spherical lens group, a second cylindrical lens group, a third cylindrical lens group, and a third spherical lens group arranged sequentially along the optical path from the object side to the image side.

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

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

[0010] 1.2 <f(G1-G6)X / f(G1-G6)Y<1.8;

[0011] -0.9 <f(G5)X / f(G1)Y<-0.3;

[0012] 2.2 <f(G5)X / f(G4)Y<3.2;

[0013] -5 <f(G1)Y / f(G4)Y<-3;

[0014] 0 <f(G2) / f(G6)<0.5;

[0015] -1.5 <f(G2) / f(G3)<-1;

[0016] -0.2 <f(G3) / f(G6)<-0.1;

[0017] Wherein, the curvature direction of the first cylindrical lens group and the second cylindrical lens group is the Y direction, and the X direction is the direction perpendicular to Y; f(G1-G6)X is the combined optical focal length of the first cylindrical lens group to the third spherical lens group along the X direction, f(G1-G6)Y is the combined optical focal length of the first cylindrical lens group to the third spherical lens group along the Y direction, f(G5)X is the combined optical focal length of the third cylindrical lens group along the X direction, f(G1)Y is the combined optical focal length of the first cylindrical lens group along the Y direction, f(G4)Y is the combined optical focal length of the second cylindrical lens group along the Y direction, f(G2) is the combined optical focal length of the first spherical lens group, f(G3) is the combined optical focal length of the second spherical lens group, and f(G6) is the combined optical focal length of the third spherical lens group; the focal length in the X direction and the focal length in the Y direction of the spherical lens group are the same.

[0018] Furthermore, the first cylindrical lens group includes a first lens and a second lens arranged sequentially from the object side to the image side along the optical path; the first lens is a cylindrical lens with negative optical power, and the second lens is a cylindrical lens with positive optical power.

[0019] The first spherical lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from the object side to the image side along the optical path; the third lens is a spherical lens with positive optical power, the fourth lens is a spherical lens with positive optical power, the fifth lens is a spherical lens with negative optical power, the sixth lens is a spherical lens with negative optical power, the seventh lens is a spherical lens with positive optical power, the eighth lens is a spherical lens with negative optical power, and the ninth lens is a spherical lens with positive optical power.

[0020] The second spherical lens group includes a tenth lens, which is a negative optical power spherical lens;

[0021] The second cylindrical lens group includes an eleventh lens; the eleventh lens is a cylindrical lens with positive optical power;

[0022] The third cylindrical lens group includes a twelfth lens and a thirteenth lens arranged sequentially from the object side to the image side along the optical path; the twelfth lens is a cylindrical lens with negative optical power, and the thirteenth lens is a cylindrical lens with positive optical power.

[0023] The third spherical lens group includes a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens arranged sequentially from the object side to the image side along the optical path; the fourteenth lens is a spherical lens with positive optical power, the fifteenth lens is a spherical lens with negative optical power, the sixteenth lens is a spherical lens with positive optical power, the seventeenth lens is a spherical lens, and the eighteenth lens is a spherical lens with negative optical power.

[0024] Furthermore, the tenth lens constitutes an inner focusing group.

[0025] Further, the fourth lens and the fifth lens are cemented together to form a cemented doublet spherical lens; and / or, the seventh lens and the eighth lens are cemented together to form a cemented doublet spherical lens; and / or, the twelfth lens and the thirteenth lens are cemented together to form a cemented doublet spherical lens; and / or, the fourteenth lens and the fifteenth lens are cemented together to form a cemented doublet spherical lens; and / or, the seventeenth lens is a spherical lens with negative optical power, and the seventeenth lens and the sixteenth lens are cemented together to form a cemented doublet spherical lens, or the seventeenth lens is a spherical lens with positive optical power, and the seventeenth lens and the eighteenth lens are cemented together to form a cemented doublet spherical lens.

[0026] Furthermore, the widescreen anamorphic lens has a combined optical focal length of 85mm-135mm in the X direction.

[0027] Furthermore, the zoom ratio of the widescreen anamorphic lens is 1.1X-1.5X, and the magnification remains constant at different object distances.

[0028] Furthermore, the total optical length of the widescreen anamorphic lens does not exceed 145mm.

[0029] Furthermore, the aperture value of the widescreen anamorphic lens does not exceed 2.0.

[0030] Furthermore, the widescreen anamorphic lens has a combined optical focal length of 98mm in the X direction; the zoom ratio of the widescreen anamorphic lens is 1.33X, and the magnification remains constant at different object distances; the aperture value of the widescreen anamorphic lens is 1.8.

[0031] Furthermore, the lenses in the first cylindrical lens group, the first spherical lens group, the second spherical lens group, the second cylindrical lens group, the third cylindrical lens group, and the third spherical lens group are all optical glass lenses.

[0032] The technical solution of this invention has the following advantages: By combining two Y-direction cylindrical lens groups, one X-direction cylindrical lens group, and multiple spherical lens groups, the optical power and the position of the cylindrical lens groups are rationally allocated, making the optical structure of the widescreen anamorphic lens more compact and cost-effective. The spherical lens group comprehensively corrects the light, and the optical characteristics of the cylindrical lens group "compress" horizontally entering light while keeping vertically entering light unchanged, thereby increasing the field of view for horizontal shooting and ensuring performance in the X direction. The Y-direction cylindrical and spherical lens groups then stabilize the performance in the other direction. In this way, the field of view for horizontal shooting is increased, i.e., the actual width of the captured image is increased, while maintaining the same widening ratio at different working distances. Furthermore, the compact design integrating the cylindrical and spherical lenses achieves a small lens size while obtaining optical performance such as large aperture, high resolution, low breath, low distortion, fixed distortion ratio, and elliptical out-of-focus spots. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is an optical structure diagram of a widescreen anamorphic lens in the Y direction when the object-image distance is infinitely far in the first embodiment of the present invention.

[0035] Figure 2 This is an optical structure diagram of a widescreen anamorphic lens in the X direction when the object-image distance is infinitely far in the first embodiment of the present invention.

[0036] Figure 3.1 This is a spherical aberration diagram of a widescreen anamorphic lens when the object-image distance is infinitely far in the first embodiment of the present invention.

[0037] Figure 3.2 This is a field curvature diagram of a widescreen anamorphic lens when the object-image distance is infinitely far in the first embodiment of the present invention.

[0038] Figure 3.3 This is a distortion diagram of a widescreen anamorphic lens when the object-image distance is infinitely far in the first embodiment of the present invention.

[0039] Figure 4 This is an optical structure diagram of a widescreen anamorphic lens in the Y direction when the object-image distance is infinitely far in the second embodiment of the present invention.

[0040] Figure 5 This is an optical structure diagram of a widescreen anamorphic lens in the X direction when the object-image distance is infinitely far in the second embodiment of the present invention.

[0041] Figure 6.1 This is a spherical aberration diagram of a widescreen anamorphic lens when the object-image distance is infinitely far in the second embodiment of the present invention.

[0042] Figure 6.2 This is a spherical aberration diagram of a widescreen anamorphic lens when the object-image distance is infinitely far in the second embodiment of the present invention.

[0043] Figure 6.3 This is a field curvature diagram of a widescreen anamorphic lens when the object-image distance is infinitely far in a second embodiment of the present invention.

[0044] Explanation of reference numerals in the attached diagram: G1, First cylindrical lens group; G2, First spherical lens group; G3, Second spherical lens group; G4, Second cylindrical lens group; G5, Third cylindrical lens group; G6, Third spherical lens group; 1, First lens; 2, Second lens; 3, Third lens; 4, Fourth lens; 5, Fifth lens; 6, Sixth lens; 7, Seventh lens; 8, Eighth lens; 9, Ninth lens; 10, Tenth lens; 11, Eleventh lens; 12, Twelfth lens; 13, Thirteenth lens; 14, Fourteenth lens; 15, Fifteenth lens; 16, Sixteenth lens; 17, Seventeenth lens; 18, Eighteenth lens. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] like Figures 1-2The widescreen anamorphic lens shown includes a first cylindrical lens group G1, a first spherical lens group G2, a second spherical lens group G3, a second cylindrical lens group G4, a third cylindrical lens group G5, and a third spherical lens group G6 arranged sequentially from the object side to the image side along the optical path.

[0048] Among them, the first cylindrical lens group G1 has negative optical power, the first spherical lens group G2 has positive optical power, the second spherical lens group G3 has negative optical power, the second cylindrical lens group G4 has positive optical power, the third cylindrical lens group G5 has positive optical power, and the third spherical lens group G6 has positive optical power.

[0049] The combined optical focal length of all lens groups satisfies the following condition:

[0050] 1.2 <f(G1-G6)X / f(G1-G6)Y<1.8;

[0051] -0.9 <f(G5)X / f(G1)Y<-0.3;

[0052] 2.2 <f(G5)X / f(G4)Y<3.2;

[0053] -5 <f(G1)Y / f(G4)Y<-3;

[0054] 0 <f(G2) / f(G6)<0.5;

[0055] -1.5 <f(G2) / f(G3)<-1;

[0056] -0.2 <f(G3) / f(G6)<-0.1;

[0057] Wherein, the curvature direction of the first cylindrical lens group G1 and the second cylindrical lens group G4 is the Y direction, and the X direction is the direction perpendicular to Y; f(G1-G6)X is the combined optical focal length of the first cylindrical lens group G1 to the third spherical lens group G6 along the X direction, f(G1-G6)Y is the combined optical focal length of the first cylindrical lens group G1 to the third spherical lens group G6 along the Y direction, f(G5)X is the combined optical focal length of the third cylindrical lens group G5 along the X direction, f(G1)Y is the combined optical focal length of the first cylindrical lens group G1 along the Y direction, f(G4)Y is the combined optical focal length of the second cylindrical lens group G4 along the Y direction, f(G2) is the combined optical focal length of the first spherical lens group G2, f(G3) is the combined optical focal length of the second spherical lens group G3, and f(G6) is the combined optical focal length of the third spherical lens group G6; the focal length of the spherical lens group is the same in all directions, including the X and Y directions.

[0058] This widescreen anamorphic lens utilizes a combination of two Y-direction cylindrical lens groups, one X-direction cylindrical lens group, and multiple spherical lens groups. By rationally allocating the optical power and the positions of the cylindrical lens groups, the optical structure of the widescreen anamorphic lens becomes more compact and cost-effective. The spherical lens group comprehensively corrects the light, while the optical characteristics of the cylindrical lens group "compress" horizontally entering light, while keeping vertically entering light unchanged. This increases the field of view for horizontal shooting, ensuring performance in the X direction. The Y-direction cylindrical and spherical lens groups then stabilize performance in the other direction. This increases the field of view for horizontal shooting, resulting in a wider actual image width, while maintaining the same widening ratio at different working distances. Furthermore, the compact design integrating the cylindrical and spherical lenses allows the lens to achieve a large aperture, high resolution, low focus, low distortion, a fixed distortion ratio, and elliptical out-of-focus spots while maintaining a small size.

[0059] In some embodiments of this example, the first cylindrical lens group G1 includes a first lens 1 and a second lens 2 arranged sequentially from the object side to the image side along the optical path; the first lens 1 is a cylindrical lens with negative optical power, and the second lens 2 is a cylindrical lens with positive optical power.

[0060] The first spherical lens group G2 includes a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9 arranged sequentially from the object side to the image side along the optical path; the third lens 3 is a spherical lens with positive optical power, the fourth lens 4 is a spherical lens with positive optical power, the fifth lens 5 is a spherical lens with negative optical power, the sixth lens 6 is a spherical lens with negative optical power, the seventh lens 7 is a spherical lens with positive optical power, the eighth lens 8 is a spherical lens with negative optical power, and the ninth lens 9 is a spherical lens with positive optical power.

[0061] The second spherical lens group G3 includes the tenth lens 10, which is a spherical lens with negative optical power.

[0062] The second cylindrical lens group G4 includes an eleventh lens 11, which is a cylindrical lens with positive optical power.

[0063] The third cylindrical lens group G5 includes a twelfth lens 12 and a thirteenth lens 13 arranged sequentially from the object side to the image side along the optical path; the twelfth lens 12 is a cylindrical lens with negative optical power, and the thirteenth lens 13 is a cylindrical lens with positive optical power.

[0064] The third spherical lens group G6 includes fourteenth lens 14, fifteenth lens 15, sixteenth lens 16, seventeenth lens 17, and eighteenth lens 18 arranged sequentially from the object side to the image side along the optical path; fourteenth lens 14 is a spherical lens with positive optical power, fifteenth lens 15 is a spherical lens with negative optical power, sixteenth lens 16 is a spherical lens with positive optical power, seventeenth lens 17 is a spherical lens, and eighteenth lens 18 is a spherical lens with negative optical power.

[0065] In this embodiment, the lenses in the first cylindrical lens group G1, the first spherical lens group G2, the second spherical lens group G3, the second cylindrical lens group G4, the third cylindrical lens group G5, and the third spherical lens group G6 are all optical glass lenses.

[0066] In some embodiments of this example, the widescreen anamorphic lens includes a total of 18 lenses, from the first lens 1 to the eighteenth lens 18. In other embodiments of this example, the number of lenses in the widescreen anamorphic lens is not limited to 18 lenses; the number of lenses in the widescreen anamorphic lens can be further varied, as long as the combined optical focal length of the various lens groups in the widescreen anamorphic lens satisfies the above-mentioned mathematical relationship.

[0067] In this embodiment, the total optical length of the widescreen anamorphic lens does not exceed 145mm; the overall optical focal length of the widescreen anamorphic lens in the X direction is 85mm-135mm; and the zoom ratio of the widescreen anamorphic lens is 1.1.

[0068] The zoom ratio is 1.33X, and the magnification remains constant across different object distances; the aperture value of the anamorphic lens does not exceed 2.0. In one specific embodiment of this example, the total optical length of the anamorphic lens is 145mm, the combined optical focal length of the anamorphic lens in the X direction is 98mm, the zoom ratio of the anamorphic lens is 1.33X, and the magnification remains constant across different object distances; the aperture value of the anamorphic lens is 1.8.

[0069] In this embodiment, the second spherical lens group G3 constitutes the internal focusing group. During adjustment, the overall length of the lens remains constant, and the floating second spherical lens group G3 moves along the optical axis while the positions of the other lens groups relative to the image side remain unchanged. This achieves focusing from the object-image distance from 0.7m to infinity, while overcoming the technical difficulties of large breathing effect and inconsistent magnification in 98mm wide-screen anamorphic lenses.

[0070] In the first embodiment of this example, the focal length allocation of the first lens 1 to the eighteenth lens 18 satisfies the following relationship:

[0071] f(1-18)X / f(1-18)Y=1.33;

[0072] f(12 - 13)X / f(1 - 2)Y = -0.71;

[0073] f(12 - 13)X / f(11)Y = 2.81;

[0074] f(1 - 2)Y / f(11)Y = -3.95;

[0075] f(3 - 9) / f(14 - 18) = 0.25;

[0076] f(3 - 9) / f(10) = -1.33;

[0077] f(10) / f(14 - 18) = -0.18.

[0078] Wherein, the curvature directions of the first lens 1, the second lens 2, and the eleventh lens 11 are in the Y direction, the X direction is perpendicular to the Y direction, and the curvature directions of the twelfth lens 12 and the thirteenth lens 13 are in the X direction. f(m - n)Y is the combined optical focal length of the m-th lens to the n-th lens in the Y direction, f(m - n)X is the combined optical focal length of the m-th lens to the n-th lens in the X direction, f(m - n) is the combined optical focal length of the m-th lens to the n-th lens, both m and n are positive integers, and 1 ≤ m < n ≤ 18. The X-direction focal length and the Y-direction focal length of the spherical lens are the same.

[0079] As Figure 1 and Figure 2 shown, in the first implementation manner of this embodiment, the fourth lens 4 and the fifth lens 5 are cemented to form a cemented doublet spherical lens; the seventh lens 7 and the eighth lens 8 are cemented to form a cemented doublet spherical lens; the twelfth lens 12 and the thirteenth lens 13 are cemented to form a cemented doublet spherical lens; the fourteenth lens 14 and the fifteenth lens 15 are cemented to form a cemented doublet spherical lens. The seventeenth lens 17 is a spherical lens with a negative optical power, and the sixteenth lens 16 and the seventeenth lens 17 are cemented to form a cemented doublet spherical lens. The cemented doublet spherical lens is used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.

[0080] It should be noted that the above-mentioned multiple sets of cemented doublet lenses are joined by adhesive bonding. As an alternative implementation, based on the concept of this invention, and to distinguish it from this application, modifications to the joining method, such as bonding or integral molding, and adaptive changes to the shape of the joined lenses, should also be included within the scope of protection of this application. For a single lens or two consecutive lenses with the same optical power, a single lens can be split into two or more lenses, or two consecutive lenses with the same optical power can be merged into one lens. Such simple transformations to the optical structure of this patent, such as the optical power allocation of the transformed lens or lens group within the range of the mathematical expression of this patent, are all within the scope of protection of this application, provided they do not depart from the spirit and intent of this application.

[0081] See Figure 3.1 , Figure 3.2 , Figure 3.3 The figure shows the spherical aberration diagram, field curvature diagram, and distortion diagram of the widescreen anamorphic lens in the first embodiment. As can be seen from the curves in the figure, the spherical aberration is basically less than ±0.5, ensuring the sharpness of the image center; the field curvature is basically less than ±0.5, ensuring that the image with a large field of view has the same sharpness; and the distortion is less than 10%, ensuring that the image has a small deformation.

[0082] Table 1 below lists the actual parameters of each lens in the widescreen anamorphic lens in the first implementation that conforms to the above mathematical relationships:

[0083] Table 1:

[0084]

[0085] like Figure 4 and Figure 5 As shown, in the two embodiments of this example, the focal length allocation of the first lens 1 to the eighteenth lens 18 satisfies the following conditions:

[0086] f(1-18)X / f(1-18)Y=1.33;

[0087] f(12-13)X / f(1-2)Y=-0.53;

[0088] f(12-13)X / f(11)Y=2.4;

[0089] f(1-2)Y / f(11)Y=-4.51

[0090] f(3-9) / f(14-18)=0.13;

[0091] f(3-9) / f(10)=-1.19;

[0092] f(10) / f(14 - 18) = -0.11.

[0093] Among them, the curvature directions of the first lens 1, the second lens 2, and the eleventh lens 11 are in the Y direction, the X direction is perpendicular to the Y direction, and the curvature directions of the twelfth lens 12 and the thirteenth lens 13 are in the X direction. f(m - n)Y is the combined optical focal length of the m-th lens to the n-th lens in the Y direction, f(m - n)X is the combined optical focal length of the m-th lens to the n-th lens in the X direction, f(m - n) is the combined optical focal length of the m-th lens to the n-th lens, m and n are both positive integers, and 1 ≤ m < n ≤ 18. The focal lengths of the spherical lens in the X direction and the Y direction are the same.

[0094] As Figure 4 and Figure 5 shown, in two implementation manners of this embodiment, the fourth lens 4 and the fifth lens 5 are cemented to form a doublet spherical lens; the seventh lens 7 and the eighth lens 8 are cemented to form a doublet spherical lens; the twelfth lens 12 and the thirteenth lens 13 are cemented to form a doublet spherical lens; the fourteenth lens 14 and the fifteenth lens 15 are cemented to form a doublet spherical lens. The seventeenth lens 17 is a spherical lens with a positive optical power, and the seventeenth lens 17 and the eighteenth lens 18 are cemented to form a doublet spherical lens; the doublet spherical lens is used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.

[0095] See Figure 6.1 , Figure 6.2 , Figure 6.3 shown, for the spherical aberration diagram, field curvature diagram, and distortion diagram of the wide-screen anamorphic lens in the second implementation manner. It can be seen from the curves in the figure that the spherical aberration is basically less than ±0.5, ensuring the clarity of the image center; the field curvature is basically less than ±0.5, ensuring the same clarity for the large field-of-view image; the distortion is less than 10%, ensuring a small amount of deformation in the imaged picture.

[0096] Table 2 below lists the actual parameters of each lens of the wide-screen anamorphic lens in the second implementation manner that conform to the above mathematical relationship:

[0097] Table 2:

[0098]

[0099]

[0100]

[0099] The wide-screen anamorphic lens provided by the present invention adopts an integrated design, achieving excellent ultra-cost-effective optical performances such as a small lens volume, high resolution, low breathing, low distortion, full-frame, and 1.33X high magnification. It can be designed to be compatible with the mounts of various brands of cameras according to actual usage requirements to achieve personalized customization and general compatibility.

[0100] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A widescreen anamorphic lens, characterized in that, It includes a first cylindrical lens group (G1), a first spherical lens group (G2), a second spherical lens group (G3), a second cylindrical lens group (G4), a third cylindrical lens group (G5), and a third spherical lens group (G6) arranged sequentially from the object side to the image side along the optical path; The first cylindrical lens group (G1) has negative optical power, the first spherical lens group (G2) has positive optical power, the second spherical lens group (G3) has negative optical power, the second cylindrical lens group (G4) has positive optical power, the third cylindrical lens group (G5) has positive optical power, and the third spherical lens group (G6) has positive optical power. The combined optical focal length of all lens groups satisfies the following condition: 1.2 <f(G1-G6)X / f(G1-G6)Y<1.8; -0.9 <f(G5)X / f(G1)Y<-0.3; 2.2 <f(G5)X / f(G4)Y<3.2; -5 <f(G1)Y / f(G4)Y<-3; 0 <f(G2) / f(G6)<0.5; -1.5 <f(G2) / f(G3)<-1; -0.2 <f(G3) / f(G6)<-0.1; Wherein, the curvature direction of the first cylindrical lens group (G1) and the second cylindrical lens group (G4) is the Y direction, and the X direction is the direction perpendicular to Y; f(G1-G6)X is the combined optical focal length of the first cylindrical lens group (G1) to the third spherical lens group (G6) along the X direction, f(G1-G6)Y is the combined optical focal length of the first cylindrical lens group (G1) to the third spherical lens group (G6) along the Y direction, and f(G5)X is the third cylindrical lens group (G4)... The combined optical focal length of group (G5) along the X direction, f(G1)Y is the combined optical focal length of the first cylindrical lens group (G1) along the Y direction, f(G4)Y is the combined optical focal length of the second cylindrical lens group (G4) along the Y direction, f(G2) is the combined optical focal length of the first spherical lens group (G2), f(G3) is the combined optical focal length of the second spherical lens group (G3), and f(G6) is the combined optical focal length of the third spherical lens group (G6).

2. The widescreen anamorphic lens according to claim 1, characterized in that, The first cylindrical lens group (G1) includes a first lens (1) and a second lens (2) arranged sequentially from the object side to the image side along the optical path; the first lens (1) is a cylindrical lens with negative optical power, and the second lens (2) is a cylindrical lens with positive optical power. The first spherical lens group (G2) includes a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8), and a ninth lens (9) arranged sequentially from the object side to the image side along the optical path; the third lens (3) is a spherical lens with positive optical power, the fourth lens (4) is a spherical lens with positive optical power, the fifth lens (5) is a spherical lens with negative optical power, the sixth lens (6) is a spherical lens with negative optical power, the seventh lens (7) is a spherical lens with positive optical power, the eighth lens (8) is a spherical lens with negative optical power, and the ninth lens (9) is a spherical lens with positive optical power. The second spherical lens group (G3) includes a tenth lens (10), which is a spherical lens with negative optical power; The second cylindrical lens group (G4) includes an eleventh lens (11); the eleventh lens (11) is a cylindrical lens with positive optical power; The third cylindrical lens group (G5) includes a twelfth lens (12) and a thirteenth lens (13) arranged sequentially from the object side to the image side along the optical path; the twelfth lens (12) is a cylindrical lens with negative optical power, and the thirteenth lens (13) is a cylindrical lens with positive optical power. The third spherical lens group (G6) includes a fourteenth lens (14), a fifteenth lens (15), a sixteenth lens (16), a seventeenth lens (17), and an eighteenth lens (18) arranged sequentially from the object side to the image side along the optical path; the fourteenth lens (14) is a spherical lens with positive optical power, the fifteenth lens (15) is a spherical lens with negative optical power, the sixteenth lens (16) is a spherical lens with positive optical power, the seventeenth lens (17) is a spherical lens, and the eighteenth lens (18) is a spherical lens with negative optical power.

3. The widescreen anamorphic lens according to claim 2, characterized in that, The tenth lens (10) constitutes the inner focusing group.

4. The widescreen anamorphic lens according to claim 2, characterized in that, The fourth lens (4) and the fifth lens (5) are cemented together to form a cemented doublet spherical lens; and / or, the seventh lens (7) and the eighth lens (8) are cemented together to form a cemented doublet spherical lens; and / or, the twelfth lens (12) and the thirteenth lens (13) are cemented together to form a cemented doublet spherical lens; and / or, the fourteenth lens (14) and the fifteenth lens (15) are cemented together to form a cemented doublet spherical lens; and / or, the seventeenth lens (17) is a spherical lens with negative optical power, and the seventeenth lens (17) and the sixteenth lens (16) are cemented together to form a cemented doublet spherical lens, or the seventeenth lens (17) is a spherical lens with positive optical power, and the seventeenth lens (17) and the eighteenth lens (18) are cemented together to form a cemented doublet spherical lens.

5. The widescreen anamorphic lens according to claim 1, characterized in that, The widescreen anamorphic lens has a combined optical focal length of 85mm-135mm in the X direction.

6. The widescreen anamorphic lens according to claim 1, characterized in that, The zoom ratio of the widescreen anamorphic lens is 1.1X-1.5X, and the magnification remains constant at different object distances.

7. The widescreen anamorphic lens according to claim 1, characterized in that, The total optical length of the widescreen anamorphic lens does not exceed 145mm.

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

0.

9. The widescreen anamorphic lens according to claim 1, characterized in that, The widescreen anamorphic lens has a combined optical focal length of 98mm in the X direction; the zoom ratio of the widescreen anamorphic lens is 1.33X, and the magnification remains constant at different object distances; the aperture value of the widescreen anamorphic lens is 1.

8.

10. The widescreen anamorphic lens according to claim 1, characterized in that, The lenses in the first cylindrical lens group (G1), the first spherical lens group (G2), the second spherical lens group (G3), the second cylindrical lens group (G4), the third cylindrical lens group (G5), and the third spherical lens group (G6) are all optical glass lenses.

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