A deformable lens

Abstract

The present invention provides a deformable lens, comprising a deformable group composed of cylindrical lenses and an imaging group composed of spherical lenses, which are arranged in sequence from the object side to the image side. The deformable group comprises a first lens, a second lens, and a third lens, which are arranged in sequence from the object side to the image side. The second lens and the third lens are bonded together. The first lens is a negative optical power biconcave cylindrical lens, the second lens is a negative optical power cylindrical lens, and the third lens is a positive optical power cylindrical lens. The optical properties of the cylindrical lenses constituting the deformable group are used to "compress" the incoming horizontal light, while the light entering the vertical field of view remains unchanged. The light is then comprehensively corrected by the subsequent imaging group, and the horizontal field of view angle is increased by 33%, thereby achieving 1.33X deformable shooting. In addition, the lens of this solution is smaller in size, lighter in weight, and relatively lower in cost, and can better meet the use needs of most ordinary users.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a deformable lens. Background Art

[0002] With the rapid development of Internet technology, taking photos and videos have become an indispensable part of the lives of ordinary consumers. In recent years, with the promotion of technologies such as 5G, more and more videos such as Vlog are shared, and more and more people are using mobile phones, cameras and other tools to shoot short videos and micro-movies.

[0003] However, the conventional shooting ratio of mobile phones, tablets, cameras and other devices on the market is 16:9, while the ratio of wide-screen videos with a cinematic feel is 2.4:1. Therefore, users need to crop the captured images through manual editing or digital cropping. However, cropping will sacrifice the pixels of the image.

[0004] Some professional anamorphic movie lens brands such as Germany's Hawk, Britain's Cooke, Germany's ARRI, the United States' Panavision, France's Angenieux and Hong Kong's SLR are usually aimed at professional-level customers. The price is generally tens of thousands of dollars or even more expensive, and the anamorphic lens itself weighs several kilograms.

[0005] Expensive and heavy professional anamorphic lenses are not suitable for ordinary users. Therefore, how to make large aperture anamorphic lenses smaller and lighter is a technical problem that needs to be solved. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the professional anamorphic lens in the prior art that it is heavy in weight and high in price and is not suitable for use by ordinary users, thereby providing a anamorphic lens.

[0007] A deformable lens comprises a deformable group composed of cylindrical lenses and an imaging group composed of spherical lenses, which are arranged in sequence from the object side to the image side. The deformable group comprises a first lens, a second lens, and a third lens, which are arranged in sequence from the object side to the image side. The second lens is a negative power cylindrical lens, and the third lens is a positive power cylindrical lens.

[0008] The first lens is a biconcave cylindrical lens with negative optical power.

[0009] The second lens and the third lens are cemented together.

[0010] The imaging group sequentially arranges a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens along the direction of the optical path pointing to the image side, the fourth lens is a positive focal length meniscus spherical lens, the fifth and eighth lenses are positive focal lengths, the sixth lens and the seventh lens are negative focal length spherical lenses, the ninth lens is a positive focal length biconvex spherical lens, and the tenth lens is a positive focal length meniscus spherical lens.

[0011] The fifth lens and the sixth lens are bonded together, the fifth lens is a positive power lens, and the sixth lens is a negative power lens.

[0012] The fifth lens and the sixth lens are independent of each other. The fifth lens is a positive-power meniscus lens, the sixth lens is a negative-power meniscus lens, and the concave surfaces of the fifth lens and the sixth lens are both arranged toward the image side.

[0013] The focal power distribution of the lenses constituting the deformation group and the lenses constituting the imaging group satisfies the following relationship:

[0014] 500<Abs(f1-3 / f4-10);

[0015] 45<f4-10<55;

[0016] 1.60<f4-6 / f4-10<2.10;

[0017] 0.60<f7-10 / f4-10<0.80;

[0018] The focal power distribution of the lenses constituting the deformation group and the lenses constituting the imaging group also satisfies the following relationship:

[0019] 1.10<abs(f1 / f2-10)<1.40;

[0020] -0.80<f1 / f2-3<-0.70;

[0021] 0.50<f4 / f4-6<0.80;

[0022] 1.0<f9-10 / f 7-10<1.60;

[0023] 5.0<abs(f7-8 / f7-10)<9.0;

[0024] Wherein, f represents the focal length of the lens in the X direction, and the number after f represents the number of the ten lenses constituting the anamorphic lens, that is, f1 is the focal length of the first lens in the X direction, f1-10 is the combined focal length of the ten lenses in the X direction, and the rest are similar.

[0025] The length of the anamorphic lens is less than 105 mm, and the maximum outer diameter of the anamorphic lens is less than 70 mm.

[0026] The focal length of the anamorphic lens in the Y direction is 50 mm, and the aperture is 1.8.

[0027] The mass of the anamorphic lens is less than 600g.

[0028] The technical solution of the present invention has the following advantages:

[0029] 1. The anamorphic lens provided by the present invention comprises an anamorphic group composed of cylindrical lenses and an imaging group composed of spherical lenses, which are arranged in sequence from the object side to the image side. The anamorphic group comprises a first lens, a second lens, and a third lens, which are arranged in sequence from the object side to the image side. The second lens and the third lens are bonded together. The first lens is a negative-power biconcave cylindrical lens, the second lens is a positive-power cylindrical lens, and the third lens is a positive-power cylindrical lens.

[0030] By using the optical properties of the cylindrical lenses that make up the anamorphic group, the light entering horizontally is "compressed", while the light entering vertically remains unchanged. The light is then comprehensively corrected by the subsequent imaging group, thereby increasing the field of view of the lens for horizontal shooting and making the actual shooting width wider. No post-editing is required, and 2.4:1 widescreen videos or photos can be obtained without sacrificing pixels. At the same time, because the anamorphic group is composed of cylindrical lenses, the anamorphic lens of this solution will have optical characteristics such as elliptical out-of-focus spots and sci-fi line flares in addition to the anamorphic function.

[0031] 2. The anamorphic lens provided by the present invention has a focal length distribution of the lenses constituting the anamorphic group and the lenses constituting the imaging group that satisfies the following relationship: 500<Abs(f1-3 / f4-10); 45<f4-10<55; 1.60<f4-6 / f4-10<2.10; 0.60<f7-10 / f4-10<0.80; 1.10<abs(f1 / f2-10)<1.40; -0.80<f1 / f2-3 <-0.70;0.50<f4 / f4-6<0.80;3.10<f10 / f7-10<4.5;1.10<abs(f2-10 / f1-10)<1.60;wherein, f represents the focal length of the lens in the X direction, and the number after f represents the number of the ten lenses constituting the anamorphic lens, that is, f1 is the focal length of the first lens in the X direction, f1-10 is the combined focal length of the first lens to the tenth lens in the X direction, and the rest are similar.

[0032] The horizontal shooting angle of the 50mmF1.8 half-frame lens is increased by 33% while the vertical angle remains unchanged, resulting in a 50mm anamorphic lens with a small size and large aperture. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is an optical structure diagram in the X direction of the first embodiment of the present invention;

[0035] Figure 2 This is a Y-direction optical structure diagram of the first embodiment of the present invention;

[0036] Figure 3 This is an optical structure diagram in the X direction of the second embodiment of the present invention;

[0037] Figure 4 This is the optical structure diagram in the Y direction of the second embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 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. Deformation group; 12. Imaging group. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Example 1

[0045] like Figure 1 , Figure 2 As shown, this embodiment provides a 50mm focal length half-frame large aperture anamorphic lens, which is composed of ten lenses arranged along the optical path from the object side to the image side, namely a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10.

[0046] Among them, the first lens 1, the second lens 2, and the third lens 3 are cylindrical lenses, the second lens 2 and the third lens 3 are bonded together, and the three cylindrical lenses constitute a deformation group 11. The fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, and the tenth lens 10 are spherical lenses, the fifth lens 5 and the sixth lens 6 are bonded together, the seventh lens 7 and the eighth lens 8 are bonded together, and the seven lenses constitute an imaging group 12.

[0047] Among them, the first lens 1 is a negative power biconcave cylindrical lens, the second lens 2 is a negative cylindrical lens, the third lens 3 is a positive power cylindrical lens, the fourth lens 4 is a positive power meniscus spherical lens, and the concave surface of the fourth lens 4 is arranged toward the image side.

[0048] Among them, the fifth lens 5 and 8 are positive power spherical lenses, the sixth lens 6 and the seventh lens 7 are negative power spherical lenses, the ninth lens 9 is a positive power biconvex spherical lens, and the tenth lens 10 is a positive power meniscus spherical lens, and the convex surface of the tenth lens is convex toward the object side.

[0049] The lenses bonded together are considered as a whole. In this embodiment, the second lens 2 and the third lens 3 are bonded together. The fifth lens 5 and the sixth lens 6 are bonded together, and the seventh lens 7 and the eighth lens 8 are bonded together. Therefore, the anamorphic lens of this embodiment is composed of 10 lenses and 7 groups.

[0050] There is no specific restriction on the combination method between the second lens 2 and the third lens 3, the fifth lens 5 and the sixth lens 6, and the seventh lens 7 and the eighth lens 8. In this embodiment, the combination method is bonding. As an alternative implementation method, based on the concept of the present invention, in order to distinguish from the present application, the above combination methods are changed, such as bonding, integrated molding, etc., and the shape of the combined lenses is adaptively changed, which should also be included in the protection scope of the present application.

[0051] Among them, the fourth lens 4 in the imaging group in this embodiment is an independent lens. As a replaceable implementation, the fourth lens 4 can be split into two or more lenses, or replaced by two or more lenses glued together. After the fourth lens 4 is replaced, the optical power distribution in this embodiment must be satisfied, that is, "0.50<f4 / f4-6<0.80". Therefore, on the basis of this embodiment, the changes and replacements made to the number and combination of lenses in order to distinguish from the present application, without departing from the main idea of ​​the present application, all belong to the protection scope of the present application.

[0052] Among them, in this embodiment, the fifth lens 5 and the sixth lens 6 located in the imaging group are bonded together. As an alternative implementation, the fifth lens 5 and the sixth lens 6 can be split into two or more independent lenses. The fifth lens 5 and the sixth lens 6 bonded together can also be replaced with an independent single lens. In order to distinguish it from the technical solution of this embodiment, after the fifth lens 5 and the sixth lens 6 in this embodiment are replaced, regardless of whether the type and shape of the lens are changed, the optical focal length of a single lens or a combined lens satisfies 0.50<f4 / f4-6<0.80, that is, it falls within the protection scope of this application.

[0053] Among them, in this embodiment, the seventh lens 7 and the eighth lens 8 located in the imaging group are bonded together. As an alternative implementation, the seventh lens 7 and the eighth lens 8 can be split into two or more independent lenses. The seventh lens 7 and the eighth lens 8 bonded together can also be replaced with an independent single lens. In order to distinguish from the technical solution of this embodiment, after the seventh lens 7 and the eighth lens 8 in this embodiment are replaced, regardless of whether the type, shape and number of the lenses are changed, the optical focal length of a single lens or a combined lens satisfies 5.0<abs(f7-8 / f 7-10)<9.0, that is, it falls within the protection scope of this application.

[0054] In this embodiment, the ninth lens 9 and the tenth lens 10 of the imaging group are two independent lenses. In this embodiment, the focal power distribution of the ninth lens 9 and the tenth lens 10 satisfies 1.0<f9-10 / f 7-10<1.60. Therefore, on the basis of satisfying the above focal power distribution, the ninth lens 9 and the tenth lens 10 are replaced by a plurality of lenses bonded together, or an independent single lens. No matter what changes are made to the shape, number, and combination of the lenses, they should be regarded as falling within the protection scope of this application.

[0055] There is no specific restriction on the specific values ​​of the actual parameters of each lens. In this embodiment, the focal length of each lens satisfies the following mathematical relationship:

[0056] 500<Abs(f1-3 / f4-10);

[0057] 45<f4-10<55;

[0058] 1.60<f4-6 / f4-10<2.10;

[0059] 0.60<f7-10 / f4-10<0.80.

[0060] The focal length of each lens also satisfies the following mathematical relationship:

[0061] 1.10<abs(f1 / f 2-10)<1.40;

[0062] -0.80<f1 / f 2-3<-0.70;

[0063] 0.50<f4 / f4-6<0.80;

[0064] 1.0<f9-10 / f 7-10<1.60;

[0065] 5.0<abs(f7-8 / f 7-10)<9.0;

[0066] Wherein, f represents the focal length of the lens in the X direction, and the number after f represents the number of the ten lenses constituting the anamorphic lens, that is, f1 is the focal length of the first lens in the X direction, f1-10 is the combined focal length of the first lens to the tenth lens in the X direction, and the rest are similar.

[0067] The actual parameters of each lens of this embodiment that conform to the above mathematical relationship are listed below:

[0068]

[0069] The first lens 1 is a high-Abbe low-dispersion lens.

[0070] Before the anamorphic lens of this embodiment is used, the field of view angle of the lens with a focal length of 50 mm and an aperture of 1.8 is: V (vertical) 18.25°, H (horizontal) 27.04°.

[0071] After adopting the anamorphic lens of this embodiment, the field of view angle of the lens with a focal length of 50 mm and an aperture of 1.8 is: V (vertical) 18.25°, H (horizontal) 36.21°.

[0072] The comparison test shows that the vertical field of view angle remains unchanged, and the horizontal field of view angle deformation ratio is: 36.21 / 27.04=1.339.

[0073] The actual width ratio is in the range of 2.35-2.40, so the distortion ratio is 1.33, which means that the horizontal field of view angle is increased by 33%, thus achieving 1.33X distortion shooting.

[0074] When the anamorphic lens of this embodiment is manufactured, the length of the anamorphic lens itself is less than 105 mm, the maximum outer diameter is less than 70 mm, and the weight is less than 600 g, which is much smaller than the photographic and video interchangeable lenses of the same specifications, and also much smaller than the professional film anamorphic lenses of the same specifications on the market.

[0075] There is no specific restriction on the material used to make each lens. In this embodiment, each lens is made of optical glass.

[0076] The lens of the present application can be designed to be compatible with the bayonet mounts of various brands of cameras on the market according to actual usage requirements, so as to achieve personalized customization and universal coordination.

[0077] Embodiment 2:

[0078] This embodiment provides a 50mm focal length half-frame large aperture anamorphic lens, which is different from the embodiment 1 in that: Figure 3 , Figure 4As shown, in this embodiment, the fifth lens 5 and the sixth lens 6 are two independent lenses. The fifth lens 5 is a positive power meniscus lens 5, and the concave surface of the fifth lens 5 faces the image side, and the sixth lens 6 is a negative power meniscus lens, and the concave surface of the sixth lens 6 faces the image side.

[0079] In this embodiment, compared with Embodiment 1, since the fifth lens 5 and the sixth lens 6 are independent of each other, the anamorphic lens of this embodiment is composed of 10 lenses and 8 groups.

[0080] In this embodiment, the fifth lens 5 and the sixth lens 6 are replaced on the basis of the embodiment 1. Since the optical path changes after the replacement, the type and shape of the lens need to be adjusted accordingly to meet the optical power distribution in the embodiment 1. Therefore, in order to distinguish from the technical solution of this embodiment, the changes in the type of lens, the lens combination method, and the number of lenses should all fall within the protection scope of this application.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A deformable lens, characterized in that: The invention comprises a deformation group (11) composed of cylindrical lenses and an imaging group (12) composed of spherical lenses, which are arranged in sequence from the object side to the image side. The deformation group (11) comprises a first lens (1), a second lens (2), and a third lens (3) which are arranged in sequence from the object side to the image side. The first lens (1) is a negative focal power cylindrical lens, the second lens (2) is a negative focal power cylindrical lens, and the third lens (3) is a positive focal power cylindrical lens. The first lens (1) is a negative optical power biconcave cylindrical lens; The imaging group (12) is provided with a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8), a ninth lens (9), and a tenth lens (10) in sequence along the direction of the optical path pointing to the image side, the fourth lens (4) is a positive focal length meniscus spherical lens, the seventh lens (7) is a negative focal length spherical lens, the eighth lens (8) is a positive focal length spherical lens, the ninth lens (9) is a positive focal length biconvex spherical lens, and the tenth lens (10) is a positive focal length meniscus spherical lens.

2. The anamorphic lens according to claim 1, wherein: The second lens (2) and the third lens (3) are bonded together.

3. The anamorphic lens according to claim 2, wherein: The second lens (2) and the third lens (3) are bonded together.

4. The anamorphic lens according to claim 1, wherein: The seventh lens (7) and the eighth lens (8) are bonded together.

5. The anamorphic lens according to claim 1, wherein: The fifth lens (5) and the sixth lens (6) are bonded together; the fifth lens (5) is a spherical lens with positive optical power, and the sixth lens (6) is a lens with negative optical power.

6. The anamorphic lens according to claim 1, wherein: The fifth lens (5) and the sixth lens (6) are independent of each other; the fifth lens (5) is a positive focal length meniscus lens 5, the sixth lens (6) is a negative focal length meniscus lens, and the concave surfaces of the fifth lens (5) and the sixth lens (6) are both arranged toward the image side.

7. The anamorphic lens according to any one of claims 1 to 6, characterized in that: The focal power distribution of the lenses constituting the deformation group (11) and the lenses constituting the imaging group (12) satisfies the following relationship: 500 <Abs(f1-3 / f4-10 ) ; 45<f4-10<55 ； 1.60 <f4-6 / f4-10<2.10; 0.60 <f7-10 / f 4-10<0.80 。 8. The anamorphic lens according to claim 7, wherein: The focal power distribution of the lenses constituting the deformation group (11) and the lenses constituting the imaging group (12) also satisfies the following relationship: 1.10 <abs(f1 / f2-10)<1.40; -0.80 <f1 / f2-3<-0.70; 0.50 <f4 / f4-6<0.80; 1.0 <f9-10 / f7-10<1.60; 5.0 <abs(f7-8 / f7-10)<9.0; Here, f represents the focal length of the lens in the X direction, and the number after f represents the numbers of the ten lenses constituting the anamorphic lens, that is, f1 is the focal length of the first lens (1) in the X direction, f1-10 is the combined focal length of the ten lenses in the X direction, i.e., the rest are similar.

9. The anamorphic lens according to any one of claims 1 to 6, characterized in that: The length of the anamorphic lens is less than 105 mm, and the maximum outer diameter of the anamorphic lens is less than 70 mm.

10. The anamorphic lens according to any one of claims 1 to 6, characterized in that: The anamorphic lens is a half-frame anamorphic lens, the focal length of the anamorphic lens in the Y direction is 50 mm, and the aperture is 1.

8.

11. The anamorphic lens according to any one of claims 1 to 6, characterized in that: The mass of the anamorphic lens is less than 600g.

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