Deformable lens

Abstract

The utility model discloses a deformable lens, which 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 from an object side to an image side, and the focal lengths of all the lens groups meet the following conditional expressions: 1.1 lt; f (1-16) Y / f (1-16) Xlt; 1.6); 1.6 lt; f (3) X / f (1-3) Xlt; 2, 4; -8lt; f (4-6) X / f (1-16) Xlt; -5.3,-5.3; -12 lt; f (10-11) Y / f (9-16) Ylt; -8; -3.5 lt; f (12-16) X / f (1-16) Xlt; and-2.3. Through the combination of the cylindrical lens group and the spherical lens group, the focal power is reasonably distributed, so that the lens is compact and small; the spherical lens group corrects the light, and the cylindrical lens group compresses the horizontal light, so that the lens obtains the performances of high resolution, low respiration, low distortion and the like.

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 has been an increasing amount of video sharing such as Vlogs, and an increasing number of people are using tools such as mobile phones and cameras to shoot short films and micro movies.

[0003] However, currently, the conventional shooting ratio of devices such as mobile phones, tablets, and cameras on the market is 16:9, while the ratio of a wide-screen video 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 needed for taking 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 deformable lenses 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, comprising 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 the optical path from the object side to the image side;

[0008] The first spherical lens group includes a first lens, a second lens, and a third lens, which are sequentially arranged 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;

[0009] The first cylindrical lens group includes a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged 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;

[0010] The second spherical lens group includes a seventh lens, an eighth lens, and a ninth lens, which are sequentially arranged 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;

[0011] The second cylindrical lens group includes a tenth lens and an eleventh lens arranged in sequence from the object side to the image side along the optical path. The tenth lens is a cylindrical lens with positive optical power, and the eleventh lens is a cylindrical lens with negative optical power;

[0012] 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 from the object side to the image side along the optical path. 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. The sixteenth lens is an aspherical lens with negative optical power;

[0013] The focal length distribution of the first lens to the sixteenth lens satisfies the following relationship:

[0014] 1.1 < f(1~16)Y / f(1~16)X < 1.6;

[0015] 1.6 < f(3)X / f(1~3)X < 2.4;

[0016] -8 < f(4~6)X / f(1~16)X < -5.3;

[0017] -12 < f(10~11)Y / f(9~16)Y < -8;

[0018] -3.5 < f(12~16)X / f(1~16)X < -2.3;

[0019] Among them, 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 combined optical focal length of the mth lens to the nth lens along the Y direction, and f(m~n)X is the combined optical focal length of the mth lens to the nth lens along the X direction. Both m and n are positive integers, and 1 ≤ m < n ≤ 16.

[0020] Further, the third lens moves back and forth to achieve internal focusing.

[0021] Further, the twelfth lens and the thirteenth lens are mutually cemented to form a doublet spherical lens; the fourteenth lens and the fifteenth lens are mutually cemented to form a doublet spherical lens. The doublet spherical lens is used to correct the optical chromatic aberration of the large magnification anamorphic lens in the horizontal and vertical directions.

[0022] Further, the fifth lens and the sixth lens are mutually cemented to form a doublet cylindrical lens; the tenth lens and the eleventh lens are mutually cemented to form a doublet cylindrical lens.

[0023] Further, the combined optical focal length of the anamorphic lens in the Y direction is in the range of 30 to 50 mm.

[0024] Furthermore, the zoom ratio range of the anamorphic lens is 1.25X to 1.4X, and the magnification for different object distances remains constant.

[0025] Furthermore, the overall optical length of the anamorphic lens does not exceed 150 mm.

[0026] Furthermore, the aperture of the anamorphic lens does not exceed 2.

[0027] 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.

[0028] 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. After the spherical lens group comprehensively corrects the light rays, and then using the optical characteristics of the cylindrical lens group, the light rays entering horizontally are "compressed", while the light rays entering vertically remain unchanged, thereby increasing the horizontal field of view angle of the lens shooting 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 half-frame and large magnification of the lens are achieved. In addition, the integrated and compact design 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

[0029] 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.

[0030] 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;

[0031] 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;

[0032] 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;

[0033] Figure 4 This is the optical structure diagram of the anamorphic lens in the X direction when the object-image distance is 0.5 m in the embodiment of the present utility model;

[0034] Figure 5 This is the optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is 0.5 m in the embodiment of the present utility model;

[0035] Figure 6 This is the optical field curvature and distortion diagram of the anamorphic lens when the object-image distance is 0.5 m in the embodiment of the present utility model.

[0036] Description of reference numerals: 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 implementation manners

[0037] Next, the technical solutions of the present utility model will be described clearly and completely 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 without making creative efforts based on the embodiments of the present utility model belong to the scope of protection of the present utility model.

[0038] 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. It 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 thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] As Figure 1-6 shown, an anamorphic lens 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 that are sequentially arranged along the optical path from the object side to the image side.

[0040] Among them, the first spherical lens group 100 includes a first lens 1, a second lens 2, and a third lens 3 arranged in sequence from the object side to the image side along the optical path. 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.

[0041] The first cylindrical lens group 200 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged in sequence from the object side to the image side along the optical path. Both the fourth lens 4 and the fifth lens 5 are cylindrical lenses with negative optical power, and the sixth lens 6 is a cylindrical lens with positive optical power.

[0042] The second spherical lens group 300 includes a seventh lens 7, an eighth lens 8, and a ninth lens 9 arranged in sequence from the object side to the image side along the optical path. Both the seventh lens 7 and the ninth lens 9 are spherical lenses with positive optical power, and the eighth lens 8 is a spherical lens with negative optical power.

[0043] The second cylindrical lens group 400 includes a tenth lens 10 and an eleventh lens 11 arranged in sequence from the object side to the image side along the optical path. The tenth lens 10 is a cylindrical lens with positive optical power, and the eleventh lens 11 is a cylindrical lens with negative optical power.

[0044] 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 arranged in sequence from the object side to the image side along the optical path. Both the twelfth lens 12 and the fourteenth lens 14 are spherical lenses with negative optical power, both the thirteenth lens 13 and the fifteenth lens 15 are spherical lenses with positive optical power, and the sixteenth lens 16 is an aspherical lens with negative optical power.

[0045] The focal length distribution of the first lens 1 to the sixteenth lens 16 satisfies the following relationships:

[0046] 1.1 < f(1~16)Y / f(1~16)X < 1.6;

[0047] 1.6 < f(3)X / f(1~3)X < 2.4;

[0048] -8 < f(4~6)X / f(1~16)X < -5.3;

[0049] -12 < f(10~11)Y / f(9~16)Y < -8;

[0050] -3.5 < f(12~16)X / f(1~16)X < -2.3;

[0051] Among them, the curvature direction of the fourth lens 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, and f(m~n)X is the combined optical focal length of the mth lens to the nth lens in the X direction. Both m and n are positive integers, and 1 ≤ m < n ≤ 16.

[0052] This anamorphic lens combines a cylindrical lens group and a spherical lens group in the X direction, rationally distributes the optical power, makes the optical structure of the anamorphic lens more compact and small, and has a lower cost. After the spherical lens group comprehensively corrects the light, and then utilizes the optical characteristics of the cylindrical lens group to "compress" the light entering horizontally, while the light entering vertically remains unchanged, thereby increasing the horizontal field of view angle of the lens shooting and ensuring the performance in the X direction. Then, the cylindrical lens group and the spherical lens group in the Y direction are used to stabilize the performance in the other direction. In this way, the semi-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 size, light in weight, and greatly reduces the cost. The aspherical lens can effectively correct the spherical aberration and astigmatism of the lens, improve the resolution of the lens while reducing the volume and weight of the lens.

[0053] In this embodiment, the combined optical focal length of the anamorphic lens in the Y direction is in the range of 30 - 50 mm. The zoom ratio of the anamorphic lens is in the range of 1.25X - 1.4X, and the magnification at different object distances remains constant. The overall optical length of the anamorphic lens does not exceed 150 mm. The aperture of the anamorphic lens does not exceed 2.

[0054] In this embodiment, the third lens 3 moves back and forth to achieve internal focusing. When adjusting, the overall length of the lens remains unchanged. By moving the third lens 3 back and forth, the object-image distance is focused from 0.65 m to infinity, while overcoming the technical difficulties of large breathing effect and non-constant magnification of the anamorphic lens.

[0055] In this embodiment, the twelfth lens 12 and the thirteenth lens 13 are glued together to form a doublet spherical lens. The fourteenth lens 14 and the fifteenth lens 15 are glued together to form a doublet spherical lens. The fifth lens 5 and the sixth lens 6 are glued together to form a doublet cylindrical lens. The tenth lens 10 and the eleventh lens 11 are glued together to form a doublet cylindrical lens. The doublet spherical lens is used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.

[0056] It should be noted that the combination method of the above-mentioned multiple groups of double-glued spherical lenses is adhesion. As an alternative implementation method, based on the concept of the present invention, in order to distinguish it from the present invention, after changing the above combination method, such as fitting, 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 the present invention. 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 relation 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 the present invention, without departing from the main idea of the present invention, all belong to the protection scope of the present invention.

[0057] 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.

[0058] See Figure 3 As shown, it is 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 ±0.2, ensuring the same clarity of the large field of view image; the distortion is less than 5%, ensuring a small amount of deformation in the imaged image.

[0059] Refer to Figure 4 and Figure 5 , adjust the third lens 3 in the anamorphic lens, and the overall length of the anamorphic lens remains unchanged, realizing that the ultra-close object image distance of the anamorphic lens is 0.5 m. See Figure 6 As shown, it is 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 of the large field of view image; the distortion is less than 10%, ensuring a small amount of deformation in the imaged image.

[0060] The following Table 1 lists the actual parameters of each lens in this embodiment that meet the above mathematical relationship:

[0061]

[0062] Table 1

[0063] The aspherical coefficients of the sixteenth lens 16 are as follows in Table 2:

[0064]

[0065] Table 2

[0066] The variable-focus lens provided by the present utility model adopts an integrated design, achieving excellent ultra-cost-effective optical performance such as small lens volume, high resolution, low breathing, low distortion, half-frame, and high magnification of 1.25X to 1.4X. It can be designed to be compatible with the mounts of various camera brands on the market according to actual usage requirements, so as to achieve personalized customization and general compatibility.

[0067] Obviously, the above embodiments are merely 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 enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present utility model.

Claims

1. A variable-focus lens, characterized in that: It 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; 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; 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. Both the fourth lens (4) and the fifth lens (5) are 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) 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. Both the seventh lens (7) and the ninth lens (9) are spherical lenses with positive optical power, and the eighth lens (8) is a spherical lens with negative optical power; The second cylindrical lens group (400) includes 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) is a cylindrical lens with positive optical power, and the eleventh lens (11) is a cylindrical lens with negative optical power; 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) arranged in sequence along the optical path from the object side to the image side. Both the twelfth lens (12) and the fourteenth lens (14) are spherical lenses with negative optical power, both the thirteenth lens (13) and the fifteenth lens (15) are 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; Wherein, the curvature direction of the fourth lens (4) 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 along the Y direction, f(m~n)X is the combined optical focal length of 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 back and forth to achieve internal focusing.

3. The variable-focus lens according to claim 1, characterized in that, The twelfth lens (12) and the thirteenth lens (13) are cemented together to form a cemented spherical lens; the fourteenth lens (14) and the fifteenth lens (15) are cemented together to form a cemented spherical lens.

4. The variable-focus lens according to claim 1, wherein, The fifth lens (5) and the sixth lens (6) are cemented together to form a cemented cylindrical lens; the tenth lens (10) and the eleventh lens (11) are cemented together to form a cemented cylindrical lens.

5. The anamorphic lens according to claim 1, wherein The overall optical focal length of the anamorphic lens in the Y direction is in the range of 30 to 50 mm.

6. The anamorphic lens according to claim 1, wherein The zoom ratio range of the anamorphic lens is 1.25X to 1.4X, and the magnification at different object distances remains constant.

7. The anamorphic lens according to claim 1, characterized in that, The overall optical length of the anamorphic lens does not exceed 150 mm.

8. The variable-focus 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), second lens (2), third lens (3), fourth lens (4), fifth lens (5), sixth lens (6), seventh lens (7), eighth lens (8), ninth lens (9), tenth lens (10), eleventh lens (11), twelfth lens (12), thirteenth lens (13), fourteenth lens (14) and fifteenth lens (15) are all optical glass lenses, and the sixteenth lens is an aspherical glass lens.

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