Full-frame large-magnification deformable lens

Abstract

The invention discloses a full-frame large-magnification deformation lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an aspherical lens which are sequentially arranged from an object plane to an image plane along an optical axis, and the focal length distribution of each lens of the full-frame large-magnification deformation lens meets the following conditions: 48mlt; f (1-17) Ylt; the thickness is 52mm; 29.2 mmlt, 29.2 mmlt; f (1-17) Xlt; 33.2 mm in diameter; 1.55 lt, 1.55 lt; f (1-17) Y / f (1-17) Xlt; 1.65, 1.65; 0.16 lt, 0.16 lt; f (2-3) Y / f (1-9) Ylt; 0.48, 0.48; -4.22 lt,-4.22 lt; f (1-3) Y / f (4-9) Ylt; -1.41,-1.41; 1.62 lt, 1.62 lt; f (1-9) X / f (10-17) Xlt; 4.85); 2.32 lt, 2.32 lt; f (1-9) Y / f (10-17) Ylt; and 6.96. A first lens group formed by a plurality of spherical lenses, a second lens group formed by a plurality of cylindrical lenses, a third lens group formed by a plurality of spherical lenses and a fourth lens group formed by a plurality of cylindrical lenses are sequentially arranged from an object plane to an image plane along an optical axis; according to the camera lens, the light rays are comprehensively corrected, the horizontally-entering light rays are compressed, and the vertically-entering light rays are maintained, so that the width of a shot picture is increased, a picture with the proportion of 2.4: 1 is obtained, the full frame and high magnification of the camera lens are realized, and the camera lens is compact in structure and low in cost.

Description

Technical Field

[0001] The invention relates to an optical lens, and in particular to a full-frame large-magnification anamorphic lens. Background Art

[0002] With the development of self-media, more and more plogs and vlogs are shared, taking photos and shooting videos have become part of the daily life of ordinary consumers, and more and more people are using mobile phones, cameras and other tools to shoot photos, short videos and micro-movies.

[0003] The existing conventional shooting equipment such as mobile phones, tablet computers, cameras, etc. have a shooting ratio of 16:9, which cannot produce a movie-like picture ratio (2.4:1), resulting in poor picture shooting effects. The anamorphic lens that can produce a movie-like picture ratio (2.4:1) is expensive, bulky and heavy, making it difficult to carry around, limiting the use of ordinary consumers. Summary of the invention

[0004] The purpose of the present invention is to provide a full-frame large-magnification anamorphic lens to solve the problem that the lenses of conventional shooting devices such as existing mobile phones, tablet computers, cameras, etc. have a shooting screen ratio of 16:9 and cannot capture a movie-like screen ratio (2.4:1), resulting in poor picture shooting effects.

[0005] The present invention is achieved through the following technical solutions:

[0006] A full-frame large-magnification anamorphic lens, comprising a first lens group, a second lens group, a third lens group, a fourth lens group and an aspherical lens arranged in sequence from an object plane to an image plane along an optical axis; the first lens group comprises a first lens, a second lens and a third lens arranged in sequence from the object plane to the image plane along the optical axis, and the first lens, the second lens and the third lens are spherical lenses; the second lens group comprises a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object plane to the image plane along the optical axis, and the fourth lens, the fifth lens and the sixth lens are cylindrical lenses; the third lens group comprises a first lens, a second lens and a third ... A seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens are sequentially arranged along the optical axis from the object plane to the image plane, and the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens are spherical lenses; the fourth lens group includes a fifteenth lens and a sixteenth lens sequentially arranged along the optical axis from the object plane to the image plane, and the fifteenth lens and the sixteenth lens are cylindrical lenses; the aspherical lens is defined as a seventeenth lens;

[0007] The focal length distribution of each lens of this full-frame large-magnification anamorphic lens meets the following conditions:

[0008] 48mm <f(1~17)Y<52mm;

[0009] 29.2mm <f(1~17)X<33.2mm;

[0010] 1.55 <f(1~17)Y / f(1~17)X<1.65;

[0011] 0.16 <f(2~3)Y / f(1~9)Y<0.48;

[0012] -4.22 <f(1~3)Y / f(4~9)Y<-1.41;

[0013] 1.62 <f(1~9)X / f(10~17)X<4.85;

[0014] 2.32 <f(1~9)Y / f(10~17)Y<6.96;

[0015] The curvature direction of the fourth lens is defined as the X direction, the direction perpendicular to the X direction is defined as the Y direction, f(m~n)X is the comprehensive optical focal length of the m-th lens to the n-th lens along 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, 1≤m <n≤17。

[0016] Further, the optical focal powers of the first lens and the second lens are negative, and the optical focal power of the third lens is positive; the optical focal powers of the fourth lens and the fifth lens are negative, and the optical focal power of the sixth lens is positive; the optical focal powers of the seventh lens, the eighth lens, the tenth lens, the thirteenth lens and the fourteenth lens are positive, and the optical focal powers of the ninth lens, the eleventh lens and the twelfth lens are negative; the optical focal power of the fifteenth lens is positive, and the optical focal power of the sixteenth lens is negative.

[0017] Further, the object side of the first lens is convex, the image side is concave, and its optical power is negative; the object side of the second lens is convex, the image side is concave, and its optical power is negative; the object side of the third lens is convex, the image side is convex, and its optical power is positive;

[0018] In the X direction, the object side of the fourth lens is concave, the image side is concave, and its optical power is negative; the object side of the fifth lens is concave, the image side is concave, and its optical power is negative; the object side of the sixth lens is convex, the image side is convex, and its optical power is positive;

[0019] The object side of the seventh lens is convex, the image side is concave, and the optical power is positive; the object side of the eighth lens is a plane, the image side is convex, and the optical power is positive; the object side of the ninth lens is a concave, the image side is a concave, and the optical power is negative; the object side of the tenth lens is a convex, the image side is a concave, and the optical power is positive; the object side of the eleventh lens is a convex, the image side is a concave, and the optical power is negative; the object side of the twelfth lens is a concave, the image side is a concave, and the optical power is negative; the object side of the thirteenth lens is a convex, the image side is a convex, and the optical power is positive; the object side of the fourteenth lens is a convex, the image side is a plane, and the optical power is positive;

[0020] In the Y direction, the object side of the fifteenth lens is convex, the image side is convex, and its optical power is positive. The object side of the sixteenth lens is concave, the image side is concave, and its optical power is negative.

[0021] Further, the eighth lens and the ninth lens are glued together to form a double-cemented spherical lens one; the tenth lens and the eleventh lens are glued together to form a double-cemented spherical lens two; the twelfth lens and the thirteenth lens are glued together to form a double-cemented spherical lens three.

[0022] Further, the fifth lens and the sixth lens are glued together to form a double-cemented cylindrical lens one, and the fifteenth lens and the sixteenth lens are glued together to form a double-cemented cylindrical lens two.

[0023] Furthermore, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.75 < Nd1 < 1.95, 30 < Vd1 < 35; the refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.8 < Nd2 < 2.1, 12 < Vd2 < 19; the refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.75 < Nd3 < 1.95, 18 < Vd3 < 25; the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.65 < Nd4 < 1.85, 47 < Vd4 < 53; the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.65 < Nd5 < 1.85, 21 < Vd5 < 33; the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.8 < Nd6 < 2.0, 26 < Vd6 < 37; the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: 1.75 < Nd7 < 2.15, 26 < Vd7 < 38; the refractive index Nd8 and Abbe number Vd8 of the material of the eighth lens satisfy: 1.65 < Nd8 < 1.9, 36 < Vd8 < 43; the refractive index Nd9 and Abbe number Vd9 of the material of the ninth lens satisfy: 1.55 < Nd9 < 1.75, 32 < Vd9 < 46; the refractive index Nd10 and Abbe number Vd10 of the material of the tenth lens satisfy: 1.7 < Nd10 < 1.9, 43 < Vd10 < 49; the refractive index Nd11 and Abbe number Vd11 of the material of the eleventh lens satisfy: 1.75 < Nd11 < 1.95, 20 < Vd11 < 26; the refractive index Nd12 and Abbe number Vd12 of the material of the twelfth lens satisfy: 1.598 < Nd12 < 1.798, 21 < Vd12 < 27; the refractive index Nd13 and Abbe number Vd13 of the material of the thirteenth lens satisfy: 1.718 < Nd13 < 1.918, 30 < Vd13 < 36; the refractive index Nd14 and Abbe number Vd14 of the material of the fourteenth lens satisfy: 1.645 < Nd14 < 1.845, 40 < Vd14 < 49; the refractive index Nd15 and Abbe number Vd15 of the material of the fifteenth lens satisfy: 1.650 < Nd15 < 1.880, 20 < Vd15 < 32; the refractive index Nd16 and Abbe number Vd16 of the material of the sixteenth lens satisfy: 1.73 < Nd16 < 1.95, 30 < Vd16 < 46; the refractive index Nd17 and Abbe number Vd17 of the material of the seventeenth lens satisfy: 1.6 < Nd17 < 1.9, 40 < Vd17 < 60.

[0024] Furthermore, the second lens and the third lens form an internal focusing group.

[0025] Furthermore, a filter is provided at the front end of the full-frame large-magnification anamorphic lens, and the filter aperture ranges from 57 mm to 67 mm.

[0026] Furthermore, the focal length of the full-frame large-magnification anamorphic lens in the Y direction is 45mm to 55mm, and / or the magnification ratio of the full-frame large-magnification anamorphic lens is 1.4X to 1.8X; and / or the aperture STO of the full-frame large-magnification anamorphic lens is located between the ninth lens and the tenth lens.

[0027] Furthermore, each lens in the first lens group, the second lens group, the third lens group and the fourth lens group is made of optical glass lenses, and the aspheric lens is made of high-precision glass aspheric surface.

[0028] The advantage of the technical solution is that a first lens group consisting of a plurality of spherical lenses, a second lens group consisting of a plurality of cylindrical lenses, a third lens group consisting of a plurality of spherical lenses and a fourth lens group consisting of a plurality of cylindrical lenses are sequentially arranged along the optical axis from the object plane to the image plane, and the optical focal length is reasonably distributed, the first lens group, the third lens group and the fourth lens group are used to perform comprehensive correction on the light, and the second lens group is used to "compress" the horizontally entering light and maintain the vertically entering light, so that the width of the picture obtained by shooting becomes larger, a picture with a ratio of 2.4:1 is obtained, the full frame and large magnification of the lens are realized, and the optical structure of the anamorphic lens is made compact and small, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0031] Figure 1 This is an optical structure diagram of a full-frame large-magnification anamorphic lens disclosed in an embodiment with the object-image distance at infinity in the X direction;

[0032] Figure 2 This is an optical structure diagram of a full-frame large-magnification anamorphic lens disclosed in an embodiment with the object-image distance at infinity in the Y direction;

[0033] Figure 3 is an optical MTF diagram of a full-frame large-magnification anamorphic lens at infinite object-image distance disclosed in the embodiment;

[0034] Figure 4 It is an optical field curvature and distortion diagram of a full-frame large-magnification anamorphic lens at infinite object-image distance disclosed in the embodiment;

[0035] Figure 5 This is an optical structure diagram of a full-frame large-magnification anamorphic lens disclosed in an embodiment with an object-image distance of 0.7m in the X direction;

[0036] Figure 6 This is an optical structure diagram of a full-frame large-magnification anamorphic lens disclosed in an embodiment with an object-image distance of 0.7m in the Y direction;

[0037] Figure 7 This is an optical MTF diagram of a full-frame large-magnification anamorphic lens at an object-image distance of 0.7m disclosed in the embodiment;

[0038] Figure 8 It is an optical field curvature and distortion diagram of a full-frame large-magnification anamorphic lens with an object-image distance of 0.7m disclosed in the embodiment. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example: Figure 1-2As shown, the full-frame large-magnification anamorphic lens includes a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4 and an aspherical lens 5 which are sequentially arranged along the optical axis from the object plane to the image plane. The first lens group 1 includes a first lens 101, a second lens 102 and a third lens 103 which are sequentially arranged along the optical axis from the object plane to the image plane. The first lens 101, the second lens 102 and the third lens 103 are spherical lenses. The second lens group 2 includes a fourth lens 201, a fifth lens 202 and a sixth lens 203 which are sequentially arranged along the optical axis from the object plane to the image plane. The fourth lens 201, the fifth lens 202 and the sixth lens 203 are cylindrical lenses. The third lens group 3 includes a first lens 101, a second lens 102 and a third lens 103 which are sequentially arranged along the optical axis from the object plane to the image plane. The first lens 101, the second lens 102 and the third lens 103 are spherical lenses. The seventh lens 301, the eighth lens 302, the ninth lens 303, the tenth lens 304, the eleventh lens 305, the twelfth lens 306, the thirteenth lens 307 and the fourteenth lens 308 are arranged in sequence from the object plane to the image plane, the seventh lens 301, the eighth lens 302, the ninth lens 303, the tenth lens 304, the eleventh lens 305, the twelfth lens 306, the thirteenth lens 307 and the fourteenth lens 308 are spherical lenses, the fourth lens group 4 includes a fifteenth lens 401 and a sixteenth lens 402 which are arranged in sequence from the object plane to the image plane along the optical axis, the fifteenth lens 401 and the sixteenth lens 402 are cylindrical lenses, and the aspherical lens 5 is defined as the seventeenth lens.

[0041] The focal length distribution of each lens of this full-frame large-magnification anamorphic lens meets the following conditions:

[0042] 48mm <f(1~17)Y<52mm;

[0043] 29.2mm <f(1~17)X<33.2mm;

[0044] 1.55 <f(1~17)Y / f(1~17)X<1.65;

[0045] 0.16 <f(2~3)Y / f(1~9)Y<0.48;

[0046] -4.22 <f(1~3)Y / f(4~9)Y<-1.41;

[0047] 1.62 <f(1~9)X / f(10~17)X<4.85;

[0048] 2.32 <f(1~9)Y / f(10~17)Y<6.96;

[0049] The curvature direction of the fourth lens 201 is defined as the X direction, the direction perpendicular to the X direction is defined as the Y direction, f(m-n)X is the comprehensive optical focal length of the m-th lens to the n-th lens along 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, 1≤m <n≤17。

[0050] Among them, the first lens group 1 composed of several spherical lenses, the third lens group 3 composed of several spherical lenses and the fourth lens group 4 composed of several cylindrical lenses are used to comprehensively correct the light, and the second lens group 2 composed of several cylindrical lenses is used to "compress" the horizontally entering light and maintain the vertically entering light, thereby increasing the field of view of the lens for horizontal shooting, so that the shooting screen ratio of the full-frame large-magnification anamorphic lens reaches 2.4:1, realizing the full frame and large magnification of the lens. Since the aspherical lens 5 can effectively correct the spherical aberration and astigmatism of the lens, it can improve the resolution of the lens, reduce the size and weight of the lens, and make the full-frame large-magnification anamorphic lens miniaturized and easy to carry.

[0051] In summary, the present embodiment provides a full-frame large-magnification anamorphic lens to solve the problem that the lenses of conventional shooting devices such as existing mobile phones, tablet computers, and cameras have a shooting picture ratio of 16:9 and cannot shoot a movie-like picture ratio (2.4:1), resulting in poor shooting effects of the picture. The embodiment mainly arranges a first lens group 1 composed of a plurality of spherical lenses, a second lens group 2 composed of a plurality of cylindrical lenses, a third lens group 3 composed of a plurality of spherical lenses, and a fourth lens group 4 composed of a plurality of cylindrical lenses in sequence along the optical axis from the object plane to the image plane, and reasonably distributes the optical power of each lens, uses the first lens group 1, the third lens group 3, and the fourth lens group 4 to perform comprehensive correction on the light, and uses the second lens group 2 to "compress" the horizontally entering light and maintain the vertically entering light, so that the width of the picture obtained by shooting becomes larger, and a picture with a ratio of 2.4:1 is obtained, so that the full frame and large magnification of the lens are realized, and the optical structure of the anamorphic lens is compact and small, and the cost is low.

[0052] In another embodiment, the full-frame large-magnification anamorphic lens is not limited to 17 lenses, and the number of lenses of the anamorphic lens can be further changed as long as the focal length distribution of each lens of the anamorphic lens satisfies the above mathematical relationship.

[0053] In the embodiment of the present invention, the object side of the first lens 101 is convex, the image side is concave, and its optical power is negative; the object side of the second lens 102 is convex, the image side is concave, and its optical power is negative; the object side of the third lens 103 is convex, the image side is convex, and its optical power is positive;

[0054] In the X direction, the object side of the fourth lens 201 is concave, the image side is concave, and its optical power is negative. The object side of the fifth lens 202 is concave, the image side is concave, and its optical power is negative. The object side of the sixth lens 203 is convex, the image side is convex, and its optical power is positive. The object side of the seventh lens 301 is convex, the image side is concave, and its optical power is positive. The object side of the eighth lens 302 is a plane, the image side is convex, and its optical power is positive. The object side of the ninth lens 303 is concave. The object side of the tenth lens 304 is a convex surface, the image side is a concave surface, and the optical power is positive. The object side of the eleventh lens 305 is a convex surface, the image side is a concave surface, and the optical power is negative. The object side of the twelfth lens 306 is a concave surface, the image side is a concave surface, and the optical power is negative. The object side of the thirteenth lens 307 is a convex surface, the image side is a convex surface, and the optical power is positive. The object side of the fourteenth lens 308 is a convex surface, the image side is a plane, and the optical power is positive.

[0055] In the Y direction, the object side of the fifteenth lens 401 is convex, the image side is convex, and its optical power is positive, and the object side of the sixteenth lens 402 is concave, the image side is concave, and its optical power is negative. The above parameters are used for each lens in the full-frame large-magnification anamorphic lens, which conforms to the mathematical relationship of the focal length distribution of each lens.

[0056] In the embodiment of the present invention, the eighth lens 302 and the ninth lens 303 are glued together to form a double-cemented spherical lens 1 (not marked in the figure); the tenth lens 304 and the eleventh lens 305 are glued together to form a double-cemented spherical lens 2 (not marked in the figure); the twelfth lens 306 and the thirteenth lens 307 are glued together to form a double-cemented spherical lens 3 (not marked in the figure). Since the double-cemented spherical lens can correct the optical chromatic aberration of the large-magnification anamorphic lens in the horizontal and vertical directions, the full-frame large-magnification anamorphic lens has good optical performance.

[0057] In the embodiment of the present invention, the fifth lens 202 and the sixth lens 203 are glued together to form a double-cemented cylindrical lens 1 (not marked in the figure), and the fifteenth lens 401 and the sixteenth lens 402 are glued together to form a double-cemented cylindrical lens 2 (not marked in the figure). Since the double-cemented cylindrical lens can correct the optical chromatic aberration of the large-magnification anamorphic lens in the horizontal and vertical directions, the full-frame large-magnification anamorphic lens has good optical performance.

[0058] It should be pointed out that the bonding method of the above-mentioned glued structure is adhesion. As an alternative embodiment, based on the concept of the present invention, in order to distinguish it from the present application, the above-mentioned bonding method is changed, such as bonding, integrated molding and other bonding methods, and the shape of the lens after bonding is adaptively changed, which 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 disassembled 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 within the range of the mathematical relationship expression, should also be included in the protection scope of the present application. On the basis of this embodiment, changes and replacements in 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 belong to the protection scope of the present application.

[0059] In the embodiments of the present invention, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.75 < Nd1 < 1.95, 30 < Vd1 < 35; the refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.8 < Nd2 < 2.1, 12 < Vd2 < 19; the refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.75 < Nd3 < 1.95, 18 < Vd3 < 25; the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.65 < Nd4 < 1.85, 47 < Vd4 < 53; the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.65 < Nd5 < 1.85, 21 < Vd5 < 33; the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.8 < Nd6 < 2.0, 26 < Vd6 < 37; the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: 1.75 < Nd7 < 2.15, 26 < Vd7 < 38; the refractive index Nd8 and Abbe number Vd8 of the material of the eighth lens satisfy: 1.65 < Nd8 < 1.9, 36 < Vd8 < 43; the refractive index Nd9 and Abbe number Vd9 of the material of the ninth lens satisfy: 1.55 < Nd9 < 1.75, 32 < Vd9 < 46; the refractive index Nd10 and Abbe number Vd10 of the material of the tenth lens satisfy: 1.7 < Nd10 < 1.9, 43 < Vd10 < 49; the refractive index Nd11 and Abbe number Vd11 of the material of the eleventh lens satisfy: 1.75 < Nd11 < 1.95, 20 < Vd11 < 26; the refractive index Nd12 and Abbe number Vd12 of the material of the twelfth lens satisfy: 1.598 < Nd12 < 1.798, 21 < Vd12 < 27; the refractive index Nd13 and Abbe number Vd13 of the material of the thirteenth lens satisfy: 1.718 < Nd13 < 1.918, 30 < Vd13 < 36; the refractive index Nd14 and Abbe number Vd14 of the material of the fourteenth lens satisfy: 1.645 < Nd14 < 1.845, 40 < Vd14 < 49; the refractive index Nd15 and Abbe number Vd15 of the material of the fifteenth lens satisfy: 1.650 < Nd15 < 1.880, 20 < Vd15 < 32; the refractive index Nd16 and Abbe number Vd16 of the material of the sixteenth lens satisfy: 1.73 < Nd16 < 1.95, 30 < Vd16 < 46; the refractive index Nd17 and Abbe number Vd17 of the material of the seventeenth lens satisfy: 1.6 < Nd17 < 1.9, 40 < Vd17 < 60. The refractive indices and Abbe numbers of the lenses in the full-frame large magnification anamorphic lens adopt the above values, which conform to the mathematical relationship of the focal length distribution of each lens.

[0060] The actual parameters of each lens in this embodiment are shown in Table 1 and Table 2. Table 1 is part of the parameters of the first lens 101 to the seventeenth lens, and Table 2 is other parameters of the seventeenth lens.

[0061]

[0062]

[0063]

[0064] Table 1

[0065]

[0066] Table 2

[0067] like Figure 1 and Figure 5 ,as well as Figure 2 and Figure 6 As shown, in the embodiment of the present invention, the second lens 102 and the third lens 103 form an inner focus group. Since the second lens 102 and the third lens 103 form an inner focus group, the overall length of the lens can be kept constant when the lens adjusts the focal length. At the same time, the use of the floating inner focus group can achieve focusing from 0.7m to infinity at the object-image distance, and at the same time, overcome the technical difficulties of the large breathing effect and the non-constant magnification of the 50mm anamorphic lens.

[0068] Figure 3 is the MTF curve of the anamorphic lens. It can be seen from the curve in the figure that the MTF of each field of view is greater than 0.2. The anamorphic lens of this embodiment has good resolution and can achieve high-definition image quality; see Figure 4 As shown, the distortion is less than 5%, ensuring that the imaging image has a smaller deformation.

[0069] Reference Figure 5 and Figure 6 , by adjusting the internal focus group in the anamorphic lens, the overall length of the lens remains unchanged, achieving an ultra-close object-image distance of 0.7m for a full-frame medium and large magnification anamorphic lens. Figure 7 The figure shows the MTF curve of the anamorphic lens. It can be seen from the curve in the figure that the minimum MTF of each field of view is about 0.1; see Figure 8 As shown, the distortion is less than 8%, ensuring that the imaging image has a small deformation, which is in line with the COOK widening imaging style.

[0070] In the embodiment of the present invention, a filter (marked in the figure) is provided at the front end of the full-frame large-magnification anamorphic lens, and the filter diameter ranges from 57mm to 67mm. Preferably, the filter diameter is 62mm. Since a filter is provided at the front end of the full-frame large-magnification anamorphic lens, the full-frame large-magnification anamorphic lens can filter out stray light and improve imaging quality.

[0071] In the embodiment of the present invention, the focal length of the full-frame large-magnification anamorphic lens in the Y direction is 45mm-55mm, and the zoom ratio is 1.4X-1.8X. More specifically, the focal length of the full-frame large-magnification anamorphic lens in the Y direction is 50mm, the zoom ratio is 1.6X, and the weight is less than 453g.

[0072] In the embodiment of the present invention, the aperture STO of the full-frame large-magnification anamorphic lens is located between the ninth lens 303 and the tenth lens 304 .

[0073] In the embodiment of the present invention, each lens in the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 can be made of, but not limited to, optical glass lenses, and the aspheric lens 5 can be made of, but not limited to, high-precision glass aspheric surfaces. Since each lens in the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 is made of optical glass lenses, and the aspheric lens 5 is made of high-precision glass aspheric surfaces, it has the advantages of wide adaptability to temperature, simple structure, low processing difficulty, easy storage and low production cost.

[0074] It should be pointed out that this full-frame large-magnification anamorphic lens adopts an integrated design, which realizes the miniaturization of the lens while obtaining excellent cost-effective optical performance such as high resolution, low breathing, low distortion, full frame, and 1.6X high magnification. It can be designed to match the mount of various brands of cameras on the market according to actual usage needs to achieve personalized customization and universal compatibility.

[0075] It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information. In addition, the terms "center of a circle", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0076] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention shall be regarded as the protection of the present invention.

Claims

1. Full-frame large magnification anamorphic lens, characterized by: It includes a first lens group, a second lens group, a third lens group, a fourth lens group and an aspherical lens which are arranged in sequence from the object plane to the image plane along the optical axis; The first lens group includes a first lens, a second lens and a third lens arranged in sequence from the object plane to the image plane along the optical axis, and the first lens, the second lens and the third lens are spherical lenses; The second lens group includes a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object plane to the image plane along the optical axis, and the fourth lens, the fifth lens and the sixth lens are cylindrical lenses; The third lens group includes a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in sequence along the optical axis from the object plane to the image plane, and the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens and the fourteenth lens are spherical lenses; The fourth lens group includes a fifteenth lens and a sixteenth lens arranged in sequence from the object plane to the image plane along the optical axis, and the fifteenth lens and the sixteenth lens are cylindrical lenses; The aspherical lens is defined as a seventeenth lens; The focal length distribution of each lens of this full-frame large-magnification anamorphic lens meets the following conditions: 48mm <f(1~17)Y<52mm; 29.2mm <f(1~17)X<33.2mm; 1.55 <f(1~17)Y / f(1~17)X<1.65; 0.16 <f(2~3)Y / f(1~9)Y<0.48 -4.22 <f(1~3)Y / f(4~9)Y<-1.41 1.62 <f(1~9)X / f(10~17)X<4.85 2.32 <f(1~9)Y / f(10~17)Y<6.96; The curvature direction of the fourth lens is defined as the X direction, the direction perpendicular to the X direction is defined as the Y direction, f(m~n)X is the comprehensive optical focal length of the m-th lens to the n-th lens along 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, 1≤m <n≤17。 2. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: The optical power of the first lens and the second lens is negative, and the optical power of the third lens is positive; The fourth lens and the fifth lens have negative refractive powers, and the sixth lens has positive refractive power; The optical power of the seventh lens, the eighth lens, the tenth lens, the thirteenth lens and the fourteenth lens is positive, and the optical power of the ninth lens, the eleventh lens and the twelfth lens is negative; The refractive power of the fifteenth lens is positive, and the refractive power of the sixteenth lens is negative.

3. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: The object side of the first lens is convex, the image side is concave, and its optical power is negative; the object side of the second lens is convex, the image side is concave, and its optical power is negative; the object side of the third lens is convex, the image side is convex, and its optical power is positive; In the X direction, the object side of the fourth lens is concave, the image side is concave, and its optical power is negative; the object side of the fifth lens is concave, the image side is concave, and its optical power is negative; the object side of the sixth lens is convex, the image side is convex, and its optical power is positive; The object side of the seventh lens is convex, the image side is concave, and the optical power is positive; the object side of the eighth lens is a plane, the image side is convex, and the optical power is positive; the object side of the ninth lens is a concave, the image side is a concave, and the optical power is negative; the object side of the tenth lens is a convex, the image side is a concave, and the optical power is positive; the object side of the eleventh lens is a convex, the image side is a concave, and the optical power is negative; the object side of the twelfth lens is a concave, the image side is a concave, and the optical power is negative; the object side of the thirteenth lens is a convex, the image side is a convex, and the optical power is positive; the object side of the fourteenth lens is a convex, the image side is a plane, and the optical power is positive; In the Y direction, the object side of the fifteenth lens is convex, the image side is convex, and its optical power is positive. The object side of the sixteenth lens is concave, the image side is concave, and its optical power is negative.

4. The full-frame large magnification anamorphic lens according to any one of claims 1 to 3, characterized in that: The eighth lens and the ninth lens are glued together to form a double-cemented spherical lens one; the tenth lens and the eleventh lens are glued together to form a double-cemented spherical lens two; the twelfth lens and the thirteenth lens are glued together to form a double-cemented spherical lens three.

5. The full-frame large magnification anamorphic lens according to any one of claims 1 to 3, characterized in that: The fifth lens and the sixth lens are glued together to form a double glued cylindrical lens 1, and the fifteenth lens and the sixteenth lens are glued together to form a double glued cylindrical lens 2.

6. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: The material refractive index Nd1 and the material Abbe constant Vd1 of the first lens satisfy: 1.75 <Nd1<1.95,30<Vd1<35; The material refractive index Nd2 and the material Abbe constant Vd2 of the second lens satisfy: 1.8 <Nd2<2.1,12<Vd2<19; The material refractive index Nd3 and the material Abbe constant Vd3 of the third lens satisfy: 1.75 <Nd3<1.95,18<Vd3<25; The material refractive index Nd4 and the material Abbe constant Vd4 of the fourth lens satisfy: 1.65 <Nd4<1.85,47<Vd4<53; The material refractive index Nd5 and the material Abbe constant Vd5 of the fifth lens satisfy: 1.65 <Nd5<1.85,21<Vd5<33; The material refractive index Nd6 and the material Abbe constant Vd6 of the sixth lens satisfy: 1.8 <Nd6<2.0,26<Vd6<37; The material refractive index Nd7 and the material Abbe constant Vd7 of the seventh lens satisfy: 1.75 <Nd7<2.15,26<Vd7<38; The material refractive index Nd8 and the material Abbe constant Vd8 of the eighth lens satisfy: 1.65 <Nd8<1.9,36<Vd8<43; The material refractive index Nd9 and the material Abbe constant Vd9 of the ninth lens satisfy: 1.55 <Nd9<1.75,32<Vd9<46; The material refractive index Nd10 and the material Abbe constant Vd10 of the tenth lens satisfy: 1.7 <Nd10<1.9,43<Vd10<49; The material refractive index Nd11 and the material Abbe constant Vd11 of the eleventh lens satisfy: 1.75 <Nd11<1.95,20<Vd11<26; The material refractive index Nd12 and the material Abbe constant Vd12 of the twelfth lens satisfy: 1.598 <Nd12<1.798,21<Vd12<27; The material refractive index Nd13 and the material Abbe constant Vd13 of the thirteenth lens satisfy: 1.718 <Nd13<1.918,30<Vd13<36; The material refractive index Nd14 and the material Abbe constant Vd14 of the fourteenth lens satisfy: 1.645 <Nd14<1.845,40<Vd14<49; The material refractive index Nd15 and the material Abbe constant Vd15 of the fifteenth lens satisfy: 1.650 <Nd15<1.880,20<Vd15<32; The material refractive index Nd16 and the material Abbe constant Vd16 of the sixteenth lens satisfy: 1.73 <Nd16<1.95,30<Vd16<46; The material refractive index Nd17 and the material Abbe constant Vd17 of the seventeenth lens satisfy: 1.6 <Nd17<1.9,40<Vd17<60。 7. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: The second lens and the third lens form an inner focusing group.

8. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: A filter is arranged at the front end of the full-frame large-magnification anamorphic lens, and the filter aperture ranges from 57 mm to 67 mm.

9. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: The focal length of the full-frame large-magnification anamorphic lens in the Y direction is 45mm to 55mm, and / or the magnification ratio of the full-frame large-magnification anamorphic lens is 1.4X to 1.8X; and / or the aperture STO of the full-frame large-magnification anamorphic lens is located between the ninth lens and the tenth lens.

10. The full-frame large magnification anamorphic lens according to claim 1, characterized in that: Each lens in the first lens group, the second lens group, the third lens group and the fourth lens group is made of optical glass lenses, and the aspherical lens is made of high-precision glass aspherical surface.

Images