Full-frame large-aperture deformable lens

Abstract

The utility model discloses a full-frame large-aperture 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 an aspherical lens group which are sequentially arranged from an object space to an image space along an optical path, the comprehensive optical focal lengths of all the lens groups meet the following conditional expressions: 1.2 < fY / fX < 1.8; f (G2) Y / fY is greater than-3.2 and less than-2.1; f (G3) X / fX is greater than-3 and less than-2; f (G5) Y / fY is greater than-1.8 and less than-1.2. Through the combined use 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 optical lens technical field, concretely relates to a full frame big aperture anamorphic lens. BACKGROUND

[0002] With the rapid development of internet technology, photographing and video become an essential part of ordinary consumers' life. In recent years, with the promotion of 5G technology, Vlog and other video sharing are more and more, and the crowd of using mobile phones, cameras and other tools to shoot short films and micro films is more and more.

[0003] However, the conventional shooting ratio of mobile phones, tablet computers, cameras and other devices on the market is 16:9, while the ratio of wide-screen video with a sense of film is 2.4:1. At the same time, good micro film or video shooting needs different focal length lenses to cooperate with each other, especially for close-up of characters, full frame big aperture anamorphic lens is needed.

[0004] The existing full frame big aperture anamorphic lens has the technical problems of high price, large volume and weight, large breathing effect and non-constant magnification. UTILITY MODEL CONTENT

[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 of the existing anamorphic lens, so as to provide a full frame big aperture anamorphic lens.

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

[0007] A full frame big aperture anamorphic lens, comprising 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 an aspherical lens group arranged in sequence along the optical path from the object side to the image side.

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

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

[0010] 1.2

[0011] -3.2

[0012] -3

[0013] -1.8 < f(G5)Y / fY < -1.2;

[0014] wherein, the curvature direction of the first cylindrical lens group is X direction, Y direction is perpendicular to X direction; fY represents the comprehensive optical focal length of all lens groups along Y direction, fX represents the comprehensive optical focal length of all lens groups along X direction, f(G2)Y represents the comprehensive optical focal length of the second spherical lens group along Y direction, f(G3)X represents the comprehensive optical focal length of the first cylindrical lens group along X direction, f(G5)Y represents the comprehensive optical focal length of the second cylindrical lens group along Y direction.

[0015] Further, the first spherical lens group comprises a first lens and a second lens arranged in sequence from the object side to the image side along the optical path; the first lens is a positive spherical lens, and the second lens is a negative spherical lens.

[0016] The second spherical lens group comprises a third lens and a fourth lens arranged in sequence from the object side to the image side along the optical path; the third lens is a negative spherical lens, and the fourth lens is a positive spherical lens.

[0017] The first cylindrical lens group comprises a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side along the optical path; the fifth lens and the sixth lens are both negative cylindrical lenses, and the seventh lens is a positive cylindrical lens.

[0018] The third spherical lens group comprises an eighth lens, a ninth lens, a tenth lens and an eleventh lens arranged in sequence from the object side to the image side along the optical path; the eighth lens and the ninth lens are both positive spherical lenses, and the tenth lens and the eleventh lens are negative spherical lenses.

[0019] The second cylindrical lens group comprises a twelfth lens and a thirteenth lens arranged in sequence from the object side to the image side along the optical path; the twelfth lens is a positive cylindrical lens, and the thirteenth lens is a negative cylindrical lens.

[0020] The fourth spherical lens group comprises a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens and an eighteenth lens arranged in sequence from the object side to the image side along the optical path; the fourteenth lens, the seventeenth lens and the eighteenth lens are all positive spherical lenses, and the fifteenth lens and the sixteenth lens are both negative spherical lenses.

[0021] The aspherical lens group comprises a nineteenth lens, and the nineteenth lens is an aspherical lens.

[0022] Further, the second spherical lens group constitutes an inner focusing group.

[0023] Further, the sixth lens and the seventh lens are cemented to form a double cemented cylindrical lens; the ninth lens and the tenth lens are cemented to form a double cemented spherical lens; the twelfth lens and the thirteenth lens are cemented to form a double cemented cylindrical lens; the fourteenth lens and the fifteenth lens are cemented to form a double cemented spherical lens; and the sixteenth lens and the seventeenth lens are cemented to form a double cemented spherical lens.

[0024] Further, the total optical focal length of the full-frame large aperture anamorphic lens in the Y direction is 60mm.

[0025] Further, the zoom ratio of the full-frame large aperture anamorphic lens is 1.5X, and the different object distance ratios are kept constant.

[0026] Further, the total optical length of the full-frame large aperture anamorphic lens is not more than 185mm.

[0027] Further, the aperture of the full-frame large aperture anamorphic lens is not more than 2.1.

[0028] 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; and the lenses in the aspherical lens group are aspherical glass lenses.

[0029] The technical scheme of the utility model has the following advantages: the X-direction cylindrical lens group and the spherical lens group are combined for use, the optical power is reasonably distributed, the optical structure of the anamorphic lens is more compact and smaller, the cost is lower, the light is comprehensively corrected by the spherical lens group, the optical characteristics of the cylindrical lens group are utilized to "compress" the horizontally entering light, the vertically entering light remains unchanged, the field angle of horizontal shooting of the lens is increased, the performance in the X direction is ensured, the performance in the other direction is stabilized by the Y-direction cylindrical lens group and the spherical lens group, the full-frame and large magnification of the lens are realized, in addition, the compact design of the integrated cylindrical lens and spherical lens makes the lens small in size, light in weight and low in cost, the aspherical lens can effectively correct the spherical aberration and astigmatism of the lens, the resolution of the lens is improved while the size and weight of the lens are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0031] Figure 1 Figure 2 is an optical structure diagram of the full-frame large-aperture anamorphic lens in the X direction when the object-image distance is at infinite in an embodiment of the present application;

[0032] Figure 2 Figure 3 is an optical structure diagram of the full-frame large-aperture anamorphic lens in the Y direction when the object-image distance is at infinite in an embodiment of the present application;

[0033] Figure 3 Figure 4 is an optical field curvature and distortion diagram of the full-frame large-aperture anamorphic lens when the object-image distance is at infinite in an embodiment of the present application;

[0034] Figure 4 Figure 5 is an optical structure diagram of the full-frame large-aperture anamorphic lens in the X direction when the object-image distance is at 0.6 m in an embodiment of the present application;

[0035] Figure 5 Figure 6 is an optical structure diagram of the full-frame large-aperture anamorphic lens in the Y direction when the object-image distance is at 0.6 m in an embodiment of the present application;

[0036] Figure 6 Figure 7 is an optical field curvature and distortion diagram of the full-frame large-aperture anamorphic lens when the object-image distance is at 0.6 m in an embodiment of the present application.

[0037] Explanation of reference signs: G1, first spherical lens group; G2, second spherical lens group; G3, first cylindrical lens group; G4, third spherical lens group; G5, second cylindrical lens group; G6, fourth spherical lens group;

[0038] G7, aspherical 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; 19, nineteenth lens. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] In the description of the utility model, it is necessary to explain, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] As Figure 1 A full-frame large aperture anamorphic lens shown in figure 6, including, along the optical path from object side to image side sequentially arranged first spherical lens group G1, second spherical lens group G2, first cylindrical lens group G3, third spherical lens group G4, second cylindrical lens group G5, fourth spherical lens group G6 and aspherical lens group G7. Wherein, the first spherical lens group G1 has negative focal power, the second spherical lens group G2 has negative focal power, the first cylindrical lens group G3 has negative focal power, the third spherical lens group G4 has positive focal power, the second cylindrical lens group G5 has negative focal power, the fourth spherical lens group G6 has positive focal power. Wherein, the lens 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, the fourth spherical lens group G6 is optical glass lens, the lens of aspherical lens group G7 is aspherical glass lens.

[0042] The comprehensive optical focal length of all lens groups satisfies the following conditional formula:

[0043] 1.2<fY / fX<1.8;

[0044] -3.2<f(G2)Y / fY<-2.1;

[0045] -3<f(G3)X / fX<-2;

[0046] -1.8<f(G5)Y / fY<-1.2;

[0047] Wherein, the curvature direction of the first cylindrical lens group G3 is X direction, and Y direction is perpendicular to X direction;fY represents the comprehensive optical focal length of all lens groups along Y direction, fX represents the comprehensive optical focal length of all lens groups along X direction, f(G2)Y represents the comprehensive optical focal length of the second spherical lens group G2 along Y direction, f(G3)X represents the comprehensive optical focal length of the first cylindrical lens group G3 along X direction, and f(G5)Y represents the comprehensive optical focal length of the second cylindrical lens group G5 along Y direction.

[0048] The first spherical lens group G1 includes the first lens 1 and the second lens 2 arranged in sequence from the object side to the image side along the light path; the first lens 1 is a spherical lens with positive focal power, and the second lens 2 is a spherical lens with negative focal power. The second spherical lens group G2 includes the third lens 3 and the fourth lens 4 arranged in sequence from the object side to the image side along the light path; the third lens 3 is a spherical lens with negative focal power, and the fourth lens 4 is a spherical lens with positive focal power. The first cylindrical lens group G3 includes the fifth lens 5, the sixth lens 6 and the seventh lens 7 arranged in sequence from the object side to the image side along the light path; the fifth lens 5 and the sixth lens 6 are both cylindrical lenses with negative focal power, and the seventh lens 7 is a cylindrical lens with positive focal power. The third spherical lens group G4 includes the eighth lens 8, the ninth lens 9, the tenth lens 10 and the eleventh lens 11 arranged in sequence from the object side to the image side along the light path; the eighth lens 8 and the ninth lens 9 are both spherical lenses with positive focal power, and the tenth lens 10 and the eleventh lens 11 are spherical lenses with negative focal power. The second cylindrical lens group G5 includes the twelfth lens 12 and the thirteenth lens 13 arranged in sequence from the object side to the image side along the light path; the twelfth lens 12 is a cylindrical lens with positive focal power, and the thirteenth lens 13 is a cylindrical lens with negative focal power. The fourth spherical lens group G6 includes the fourteenth lens 14, the fifteenth lens 15, the sixteenth lens 16, the seventeenth lens 17 and the eighteenth lens 18 arranged in sequence from the object side to the image side along the light path; the fourteenth lens 14, the seventeenth lens 17 and the eighteenth lens 18 are all spherical lenses with positive focal power, and the fifteenth lens 15 and the sixteenth lens are both spherical lenses with negative focal power. The aspherical lens group G7 includes the nineteenth lens 19, which is an aspherical lens.

[0049] The full-frame large-aperture anamorphic lens is combined with the X-direction cylindrical lens group and the spherical lens group, the focal power is reasonably distributed, the optical structure of the anamorphic lens is more compact, the cost is lower, the light is comprehensively corrected by the spherical lens group, the optical characteristics of the cylindrical lens group are used to “compress” the horizontally entering light, the vertically entering light remains unchanged, thereby increasing the horizontal field angle of the lens, and the performance of the X direction is ensured. The Y-direction cylindrical lens group and the spherical lens group are used to stabilize the performance of the other direction. In this way, the full-frame and large magnification of the lens are realized. In addition, the compact design of the cylindrical lens and the spherical lens makes the lens small in size, light in weight and low in cost. The aspherical lens can effectively correct the spherical aberration and astigmatism of the lens, improve the resolution of the lens, and reduce the size and weight of the lens.

[0050] In the embodiment, the sixth lens 6 and the seventh lens 7 are cemented to form a double-cemented cylindrical lens; the ninth lens 9 and the tenth lens 10 are cemented to form a double-cemented spherical lens; the twelfth lens 12 and the thirteenth lens 13 are cemented to form a double-cemented cylindrical lens; the fourteenth lens 14 and the fifteenth lens 15 are cemented to form a double-cemented spherical lens, and the sixteenth lens 16 and the seventeenth lens 17 are cemented to form a double-cemented spherical lens. The double-cemented spherical lens is used to correct the optical chromatic aberration of the anamorphic lens in the horizontal direction and the vertical direction.

[0051] It should be noted that the combination mode of the above-mentioned multiple double-cemented spherical lens is cementing. As an alternative embodiment, based on the concept of the utility model, in order to distinguish from the present application, the combination mode is changed, such as bonding, one-piece forming and the like, and the lens shape after combination is adaptively changed, which should also be included in the protection scope of the present application. For a single lens or two continuous lenses with the same symbol, the single lens can be divided into two or more lenses, the two continuous lenses with the same symbol can be combined into one lens, and the like, and the simple transformation of the optical structure of the patent, such as the lens or lens group focal length distribution after transformation, is within the scope of the mathematical relationship expression of the patent. On the basis of the embodiment, in order to distinguish from the present application, the lens number and combination mode are changed and replaced, which, without departing from the main idea of the present application, belongs to the protection scope of the present application.

[0052] In the embodiment, the second spherical lens group G2 constitutes an inner focusing group. When adjusting, the overall length of the lens remains unchanged, the floating inner focusing group is used to realize the focusing of the object distance from 0.6m to infinity, and the technical difficulties of large breathing effect and variable magnification are overcome.

[0053] In the embodiment, the overall optical focal length of the full-frame large-aperture anamorphic lens in the Y direction is 60mm. The zoom ratio of the full-frame large-aperture anamorphic lens is 1.5X, and the magnification remains constant at different object distances. The overall optical length of the full-frame large-aperture anamorphic lens is not more than 185mm.

[0054] Referring to Figure 3 As shown in the field curvature diagram and the distortion diagram of the full-frame large-aperture anamorphic lens, it can be seen from the curves in the diagram that the field curvature is basically less than ±0.5, which ensures that the large field of view has the same clarity; the distortion is less than 5%, which ensures that the imaging picture has a small deformation.

[0055] Referring to Figure 4 and Figure 5 The inner focusing group in the full-frame large-aperture anamorphic lens is adjusted, the overall length of the anamorphic lens remains unchanged, and the super-close object distance of the full-frame large-aperture anamorphic lens is 0.6m. Referring to Figure 6The field curvature and distortion of the anamorphic lens at the near object distance are shown in the figures, and it can be seen from the curves that the field curvature is less than ±1, which ensures that the large field of view has the same clarity, and the distortion is less than 5%, which ensures that the imaging picture has a small deformation.

[0056] The actual parameters of each lens of the embodiment are listed in Table 1 below, which meets the mathematical relationship described above:

[0057]

[0058]

[0059] Table 1

[0060] The aspheric coefficients of the nineteenth lens 19 are shown in Table 2 below:

[0061] Face 1 Face 2 K 15.0666765 1.737249941 A4 -2.81166E-06 1.52026E-06 A6 -8.0988E-08 -1.24852E-07 A8 4.41431E-11 1.24607E-10 A10 7.50535E-15 -2.48132E-13

[0062] Table 2

[0063] The full-frame large-aperture anamorphic lens provided by the utility model has the advantages of integrated design, small lens size, high resolution, low breathing, low distortion, full-frame, 1.5X high magnification, and excellent super cost-effective optical performance, and can be designed to be compatible with the bayonet of cameras of various brands on the market according to actual use requirements, so as to realize personalized customization and cooperation with the universal.

[0064] Obviously, the above embodiments are only examples for clearly illustrating, and are not limitations to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A full-frame hyper-compact anamorphic lens characterized in that, 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), the fourth spherical lens group (G6) and the aspherical lens group (G7) are sequentially arranged along the optical path from the object side to the image side; The first spherical lens group (G1) has negative focal power, the second spherical lens group (G2) has negative focal power, the first cylindrical lens group (G3) has negative focal power, the third spherical lens group (G4) has positive focal power, the second cylindrical lens group (G5) has negative focal power, and the fourth spherical lens group (G6) has positive focal power; The comprehensive optical focal length of all lens groups satisfies the following conditional expression: 1.2 2. The full-frame hyper-compact anamorphic lens of claim 1, wherein, The first spherical lens group (G1) comprises a first lens (1) and a second lens (2) sequentially arranged along the optical path from the object side to the image side; the first lens (1) is a positive spherical lens, and the second lens (2) is a negative spherical lens; The second spherical lens group (G2) comprises a third lens (3) and a fourth lens (4) sequentially arranged along the optical path from the object side to the image side; the third lens (3) is a negative spherical lens, and the fourth lens (4) is a positive spherical lens; The first cylindrical lens group (G3) comprises a fifth lens (5), a sixth lens (6) and a seventh lens (7) sequentially arranged along the optical path from the object side to the image side; the fifth lens (5) and the sixth lens (6) are both negative cylindrical lenses, and the seventh lens (7) is a positive cylindrical lens; The third spherical lens group (G4) comprises an eighth lens (8), a ninth lens (9), a tenth lens (10) and an eleventh lens (11) sequentially arranged along the optical path from the object side to the image side; the eighth lens (8) and the ninth lens (9) are both positive spherical lenses, and the tenth lens (10) and the eleventh lens (11) are both negative spherical lenses; The second cylindrical lens group (G5) comprises a twelfth lens (12) and a thirteenth lens (13) sequentially arranged along the optical path from the object side to the image side; the twelfth lens (12) is a positive cylindrical lens, and the thirteenth lens (13) is a negative cylindrical lens; The fourth spherical lens group (G6) comprises, in sequence from the object side to the image side along the optical path, a fourteenth lens (14), a fifteenth lens (15), a sixteenth lens (16), a seventeenth lens (17), and an eighteenth lens (18); the fourteenth lens (14), the seventeenth lens (17), and the eighteenth lens (18) are all spherical lenses with positive refractive powers, and the fifteenth lens (15) and the sixteenth lens (16) are both spherical lenses with negative refractive powers. The aspherical lens group (G7) comprises a nineteenth lens (19), which is an aspherical lens.

3. The full-frame hyper-compact anamorphic lens of claim 2, wherein, The second spherical lens group (G2) constitutes an inner focusing group.

4. The full-frame hyper-compact anamorphic lens of claim 2, wherein, The sixth lens (6) and the seventh lens (7) are cemented to form a double-cemented cylindrical lens; the ninth lens (9) and the tenth lens (10) are cemented to form a double-cemented spherical lens; the twelfth lens (12) and the thirteenth lens (13) are cemented to form a double-cemented cylindrical lens; the fourteenth lens (14) and the fifteenth lens (15) are cemented to form a double-cemented spherical lens; and the sixteenth lens (16) and the seventeenth lens (17) are cemented to form a double-cemented spherical lens.

5. The full-frame hyper-compact anamorphic lens of claim 1, wherein, The full-frame large-aperture anamorphic lens has a total optical focal length of 60 mm in the Y direction.

6. The full-frame hyper-compact anamorphic lens of claim 1, wherein, The full-frame large-aperture anamorphic lens has a zoom ratio of 1.5X, and the magnification ratio remains constant at different object distances.

7. The full-frame hyper-compact anamorphic lens of claim 1, wherein, The total optical length of the full-frame large-aperture anamorphic lens is not more than 185 mm.

8. The full-frame hyper-compact anamorphic lens of claim 1, wherein, The aperture of the full-frame large-aperture anamorphic lens is not more than 2.

1.

9. The full-frame hyper-compact anamorphic lens of 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; and the lens in the aspherical lens group (G7) is an aspherical glass lens.

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