Deformable lens
By combining the cylindrical lens group and the spherical lens group, the problems of large volume weight, large breathing effect and inconstant magnification of the deformed lens are solved, and a compact, low-cost and high-resolution lens design is achieved.
Patent Information
- Application Number
- CN202411280555.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-15
AI Technical Summary
Existing deformation lenses have technical problems such as expensive, large volume and weight, large breathing effect and inconstant magnification.
The integrated design of the deformed lens is adopted, and the optical power is reasonably allocated by combining the X-direction cylindrical lens group and the spherical lens group, and the spherical lens group is used to correct the light. The cylindrical lens group compresses the horizontal light, and combines the double-glued lens group to correct the optical chromatic aberration to achieve the compactness and high resolution of the lens.
It achieves the lens with small size, light weight, low cost, and excellent performance of high resolution, low respiration effect and low distortion, which is suitable for the coordinated shooting of lenses with different focal lengths.
Smart Images
Figure CN120491273A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of optical lenses, and in particular to a deformable lens. Background Art
[0002] With the rapid development of internet technology, taking photos and videos has become an essential part of everyday life for ordinary consumers. In recent years, driven by technologies like 5G, the sharing of videos like vlogs has become increasingly popular, and more and more people are using mobile phones, cameras, and other tools to shoot short videos and micro-films.
[0003] However, the typical shooting ratio on 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, shooting a good micro-film or video requires lenses of different focal lengths to work together, especially close-ups of characters, which require medium- to long-focus anamorphic lenses.
[0004] Existing anamorphic lenses have technical problems such as high price, large size and weight, large breathing effect and inconsistent magnification. Summary of the Invention
[0005] Therefore, the technical problem to be solved by the present application is to overcome the technical problems of the anamorphic lens in the prior art, such as high price, large volume and weight, large breathing effect and inconsistent magnification, thereby providing an anamorphic lens.
[0006] To solve the above technical problems, the technical solutions of this application are as follows: An anamorphic lens comprises a first spherical lens group, a first cylindrical lens group, a second spherical lens group, a second cylindrical lens group, and a third spherical lens group, which are sequentially arranged along an optical path from the object side to the image side. The first spherical lens group includes a first lens, a second lens, and a third lens arranged in sequence along the optical path from the object side to the image side, the first lens is a spherical lens with positive optical power, the second lens is a spherical lens with negative optical power, and the third lens is a spherical lens with negative optical power; The first cylindrical lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence along the optical path from the object side to the image side, the fourth lens and the fifth lens are both cylindrical lenses with negative optical power, and the sixth lens is a cylindrical lens with positive optical power; The second spherical lens group includes a seventh lens, an eighth lens, and a ninth lens arranged in sequence along the optical path from the object side to the image side, the seventh lens and the ninth lens are both spherical lenses with positive optical power, and the eighth lens is a spherical lens with negative optical power; The second cylindrical lens group includes a tenth lens and an eleventh lens arranged in sequence along the optical path from the object side to the image side, the tenth lens is a cylindrical lens with positive optical power, and the eleventh lens is a cylindrical lens with negative optical power; The third spherical lens group includes a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged in sequence along the optical path from the object side to the image side, the twelfth lens and the fourteenth lens are both spherical lenses with negative optical power, the thirteenth lens and the fifteenth lens are both spherical lenses with positive optical power, and the sixteenth lens is an aspherical lens with negative optical power; The focal length distribution of the first lens to the sixteenth lens satisfies the following relationship: 1.1 <f(1~16)Y / f(1~16)X<1.6; 1.6 <f(3)X / f(1~3)X<2.4; -8 <f(4~6)X / f(1~16)X<-5.3; -12 <f(10~11)Y / f(9~16)Y<-8; -3.5 <f(12~16)X / f(1~16)X<-2.3; The curvature direction of the fourth lens is the X direction, and the Y direction is the direction perpendicular to the X direction; f(m~n)Y is the comprehensive optical focal length of the m-th lens to the n-th lens along the Y direction, and f(m~n)X is the comprehensive optical focal length of the m-th lens to the n-th lens along the X direction, m and n are both positive integers, 1≤m <n≤16。
[0007] Furthermore, the third lens moves back and forth to achieve inner focusing.
[0008] Furthermore, the twelfth lens and the thirteenth lens are cemented together to form a double cemented spherical lens; the fourteenth lens and the fifteenth lens are cemented together to form a double cemented spherical lens. The double cemented spherical lens is used to correct the optical chromatic aberration of the large magnification anamorphic lens in the horizontal and vertical directions.
[0009] Furthermore, the fifth lens and the sixth lens are glued together to form a doublet cylindrical lens; and the tenth lens and the eleventh lens are glued together to form a doublet cylindrical lens.
[0010] Furthermore, the comprehensive optical focal length of the anamorphic lens in the Y direction is within the range of 30 to 50 mm.
[0011] Furthermore, the zoom ratio range of the anamorphic lens is 1.25X to 1.4X, and the magnification ratio remains constant at different object distances.
[0012] Furthermore, the total optical length of the anamorphic lens does not exceed 150 mm.
[0013] Furthermore, the aperture of the anamorphic lens does not exceed 2.
[0014] Furthermore, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens and the fifteenth lens are all optical glass lenses, and the sixteenth lens is an aspherical glass lens.
[0015] The technical solution of the present application 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, and the cost lower, and the light is comprehensively corrected by the spherical lens group, and then the optical characteristics of the cylindrical lens group are used to "compress" the light entering horizontally, while the light entering vertically remains unchanged, thereby increasing the field of view of the lens for horizontal shooting and ensuring the performance in the X direction. The Y-direction cylindrical lens group and the spherical lens group are then used to stabilize the performance in the other direction. In this way, the half-frame and large magnification of the lens are achieved. In addition, the compact design of the integrated cylindrical lens and spherical lens makes the lens small in size and light in weight, greatly reducing 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 size and weight of the lens. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0017] Figure 1 This is an optical structure diagram of the anamorphic lens in the X direction when the object-image distance is infinite in an embodiment of the present invention; Figure 2 This is an optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is infinite in an embodiment of the present invention; Figure 3 Graphs showing the optical field curvature and distortion of the anamorphic lens when the object-image distance is infinite in an embodiment of the present invention; Figure 4 : This is an optical structure diagram of the anamorphic lens in the X direction when the object-image distance is 0.5m in an embodiment of the present invention; Figure 5 : This is an optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is 0.5m in an embodiment of the present invention; Figure 6 Graphs showing the optical field curvature and distortion of the anamorphic lens when the object-image distance is 0.5 m in an embodiment of the present invention.
[0018] Explanation of the accompanying drawings: 100, first spherical lens group; 200, first cylindrical lens group; 300, second spherical lens group; 400, second cylindrical lens group; 500, 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. DETAILED DESCRIPTION
[0019] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.
[0020] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0021] like Figure 1-6 The anamorphic lens shown includes a first spherical lens group 100, a first cylindrical lens group 200, a second spherical lens group 300, a second cylindrical lens group 400 and a third spherical lens group 500 arranged in sequence along the optical path from the object side to the image side.
[0022] The first spherical lens group 100 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 positive optical power, the second lens 2 is a spherical lens with negative optical power, and the third lens 3 is a spherical lens with negative optical power.
[0023] The first cylindrical lens group 200 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged in sequence along the optical path from the object side to the image side. The fourth lens 4 and the fifth lens 5 are both cylindrical lenses with negative optical power, and the sixth lens 6 is a cylindrical lens with positive optical power.
[0024] The second spherical lens group 300 includes a seventh lens 7, an eighth lens 8, and a ninth lens 9 arranged in sequence along the optical path from the object side to the image side. The seventh lens 7 and the ninth lens 9 are both spherical lenses with positive optical power, and the eighth lens 8 is a spherical lens with negative optical power.
[0025] The second cylindrical lens group 400 includes a tenth lens 10 and an eleventh lens 11 sequentially arranged along the optical path from the object side to the image side. The tenth lens 10 is a cylindrical lens with positive refractive power, and the eleventh lens 11 is a cylindrical lens with negative refractive power.
[0026] The third spherical lens group 500 includes a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, and a sixteenth lens 16, which are arranged in sequence along the optical path from the object side to the image side. The twelfth lens 12 and the fourteenth lens 14 are both spherical lenses with negative optical power, the thirteenth lens 13 and the fifteenth lens 15 are both spherical lenses with positive optical power, and the sixteenth lens 16 is an aspherical lens with negative optical power.
[0027] The focal lengths of the first lens 1 to the sixteenth lens 16 are distributed to satisfy the following relationship: 1.1 <f(1~16)Y / f(1~16)X<1.6; 1.6 <f(3)X / f(1~3)X<2.4; -8 <f(4~6)X / f(1~16)X<-5.3; -12 <f(10~11)Y / f(9~16)Y<-8; -3.5 <f(12~16)X / f(1~16)X<-2.3; Wherein, the curvature direction of the fourth lens is the X direction, and the Y direction is the direction perpendicular to X; f(m~n)Y is the comprehensive optical focal length from the mth lens to the nth lens along the Y direction, and f(m~n)X is the comprehensive optical focal length from the mth lens to the nth lens along the X direction, m and n are both positive integers, 1≤m <n≤16。
[0028] This anamorphic lens combines an X-direction cylindrical lens group with a spherical lens group to rationally distribute optical power, making the anamorphic lens's optical structure more compact and cost-effective. The spherical lens group provides comprehensive correction for light, and then leverages the optical properties of the cylindrical lens group to "compress" horizontally entering light while maintaining vertical light. This increases the lens' horizontal field of view and ensures performance in the X direction. The Y-direction cylindrical and spherical lens groups stabilize performance in the other direction. This achieves half-frame and high magnification. Furthermore, the compact design of the integrated cylindrical and spherical lenses makes the lens small and lightweight, significantly reducing cost. The aspherical lens effectively corrects spherical aberration and astigmatism, improving resolution while reducing size and weight.
[0029] In this embodiment, the anamorphic lens has a comprehensive optical focal length in the Y direction of 30 to 50 mm. The zoom ratio of the anamorphic lens is within the range of 1.25X to 1.4X, and the magnification ratio remains constant at different object distances. The total optical length of the anamorphic lens does not exceed 150 mm. The aperture of the anamorphic lens does not exceed 2.
[0030] In this embodiment, the third lens 3 moves back and forth to achieve internal focusing. While the overall length of the lens remains unchanged during adjustment, the forward and backward movement of the third lens 3 allows for focusing from an object-image distance of 0.65m to infinity, while overcoming the technical difficulties of anamorphic lenses with their significant breathing effect and variable magnification.
[0031] In this embodiment, the twelfth lens 12 and the thirteenth lens 13 are cemented together to form a double cemented spherical lens. The fourteenth lens 14 and the fifteenth lens 15 are cemented together to form a double cemented spherical lens. The fifth lens 5 and the sixth lens 6 are cemented together to form a double cemented cylindrical lens. The tenth lens 10 and the eleventh lens 11 are cemented together to form a double cemented cylindrical lens. The double cemented spherical lens is used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.
[0032] It should be pointed out that the above-mentioned multiple groups of double-glued spherical lenses are combined by bonding. As an alternative embodiment, based on the concept of the present application, in order to distinguish it from the present application, after the above-mentioned combination method is changed, such as bonding, integral molding and other combination methods, and then the shape of the combined lens is adaptively changed, it should also be included in the protection scope of the present 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, and two consecutive lenses with the same sign can be combined into one lens. Such simple transformations of the optical structure of the patent, such as the distribution of the optical power of the transformed lens or lens group, are within the scope of the mathematical relationship expression of the patent. On the basis of this embodiment, changes and replacements of the number and combination of lenses in order to distinguish it from the present application, without departing from the main idea of the present application, all fall within the protection scope of the present application.
[0033] In this embodiment, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, the thirteenth lens 13, the fourteenth lens 14 and the fifteenth lens 15 are all optical glass lenses, and the sixteenth lens 16 is an aspherical glass lens.
[0034] See also Figure 3 As shown in the figure, the field curvature and distortion diagrams of the anamorphic lens are as follows. It can be seen from the curves in the figure that the field curvature is basically less than ±0.2, ensuring that the image has the same clarity in a large field of view; the distortion is less than 5%, ensuring that the imaging image has a small deformation.
[0035] Reference Figure 4 and Figure 5 , by adjusting the third lens 3 in the anamorphic lens, the overall length of the anamorphic lens remains unchanged, achieving an ultra-close object-image distance of 0.5m. Figure 6 As shown in the figure, the field curvature and distortion diagrams of the anamorphic lens at close object distances can be seen from the curves in the figure. It can be seen that the field curvature is basically less than ±0.5, ensuring that the image has the same clarity in a large field of view; the distortion is less than 10%, ensuring that the imaging image has a small deformation.
[0036] Table 1 below lists the actual parameters of each lens of this embodiment that conform to the above mathematical relationship:
[0037] Table 1 The aspheric coefficients of the sixteenth lens 16 are shown in Table 2:
[0038] Table 2 The anamorphic lens provided in this application adopts an integrated design to achieve a small lens size while obtaining excellent cost-effective optical performance such as high resolution, low breathing, low distortion, half-frame, and a high magnification of 1.25X~1.4X. It can be designed to be compatible with the mounts of various brands of cameras on the market according to actual usage needs to achieve personalized customization and universal compatibility.
[0039] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.
Claims
1. An anamorphic lens, characterized in that: It comprises a first spherical lens group (100), a first cylindrical lens group (200), a second spherical lens group (300), a second cylindrical lens group (400), and a third spherical lens group (500) which are sequentially arranged along an optical path from the object side to the image side; The first spherical lens group (100) comprises 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) being a spherical lens with positive optical power, the second lens (2) being a spherical lens with negative optical power, and the third lens (3) being a spherical lens with negative optical power; The first cylindrical lens group (200) comprises a fourth lens (4), a fifth lens (5), and a sixth lens (6) arranged in sequence along the optical path from the object side to the image side, the fourth lens (4) and the fifth lens (5) are both cylindrical lenses with negative optical power, and the sixth lens (6) is a cylindrical lens with positive optical power; The second spherical lens group (300) comprises a seventh lens (7), an eighth lens (8), and a ninth lens (9) arranged in sequence along the optical path from the object side to the image side, the seventh lens (7) and the ninth lens (9) being spherical lenses with positive optical power, and the eighth lens (8) being a spherical lens with negative optical power; The second cylindrical lens group (400) comprises 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 tenth lens (10) being a cylindrical lens with positive optical power, and the eleventh lens (11) being a cylindrical lens with negative optical power; The third spherical lens group (500) comprises a twelfth lens (12), a thirteenth lens (13), a fourteenth lens (14), a fifteenth lens (15), and a sixteenth lens (16) arranged in sequence along the optical path from the object side to the image side, the twelfth lens (12) and the fourteenth lens (14) are both spherical lenses with negative optical power, the thirteenth lens (13) and the fifteenth lens (15) are both spherical lenses with positive optical power, and the sixteenth lens (16) is an aspherical lens with negative optical power; The focal length distribution of the first lens (1) to the sixteenth lens (16) satisfies the following relationship: 1.1 <f(1~16)Y / f(1~16)X<1.6; 1.6 <f(3)X / f(1~3)X<2.4; -8 <f(4~6)X / f(1~16)X<-5.3; -12 <f(10~11)Y / f(9~16)Y<-8; -3.5 <f(12~16)X / f(1~16)X<-2.3; The curvature direction of the fourth lens (4) is the X direction, and the Y direction is the direction perpendicular to the X direction; f(m~n)Y is the comprehensive optical focal length from the mth lens to the nth lens along the Y direction, and f(m~n)X is the comprehensive optical focal length from the mth lens to the nth lens along the X direction, m and n are both positive integers, and 1≤m <n≤16。 2. The anamorphic lens according to claim 1, wherein: The third lens (3) moves forward and backward to achieve internal focusing.
3. The anamorphic lens according to claim 1, wherein: The twelfth lens (12) and the thirteenth lens (13) are glued together to form a double glued spherical lens; the fourteenth lens (14) and the fifteenth lens (15) are glued together to form a double glued spherical lens.
4. The anamorphic lens according to claim 1, wherein: The fifth lens (5) and the sixth lens (6) are glued together to form a double-cemented cylindrical lens; the tenth lens (10) and the eleventh lens (11) are glued together to form a double-cemented cylindrical lens.
5. The anamorphic lens according to claim 1, wherein: The comprehensive optical focal length of the anamorphic lens in the Y direction is within the range of 30 to 50 mm.
6. The anamorphic lens according to claim 1, wherein: The zoom ratio of the anamorphic lens ranges from 1.25X to 1.4X, and the magnification remains constant at different object distances.
7. The anamorphic lens according to claim 1, wherein: The total optical length of the anamorphic lens does not exceed 150 mm.
8. The anamorphic lens according to claim 1, wherein: The aperture of the anamorphic lens does not exceed 2.
9. The anamorphic lens according to claim 1, wherein: The first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), the tenth lens (10), the eleventh lens (11), the twelfth lens (12), the thirteenth lens (13), the fourteenth lens (14) and the fifteenth lens (15) are all optical glass lenses, and the sixteenth lens is an aspherical glass lens.