Full-frame large-aperture lens

Abstract

The utility model discloses a full-frame large-aperture lens, and belongs to the technical field of optical lenses, and the full-frame large-aperture lens comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are sequentially arranged from the object side to the image side along an optical axis. The focal lengths of all the lens groups meet the following conditional expressions:-3.2 < f (G1) / f (G2-G4) <-1.7; -3.4 < f (G3) / f (G2-G4) <-1.9; -3.3 < f (G1) / f <-1.8; f (G4) / f (G2-G4) is greater than 1.3 and less than 2.5. According to the full-frame large-aperture lens, various aberrations of various wave bands are corrected, the central field of view and the edge field of view have enough resolution, the full-frame large-aperture lens has the advantages of being simple in structure, small in size and large in aperture, and the high resolution of imaging of the object distance from infinity to close distance can be achieved.

Description

Technical Field

[0001] This application relates to the field of optical lens technology, specifically to a full-frame large-aperture lens. Background Technology

[0002] In recent years, although the multi-functionality of mobile phones has replaced point-and-shoot cameras for everyday photography, for photography enthusiasts with higher demands, mirrorless cameras offer a more perfect photographic experience. Mirrorless cameras have advantages such as small size, light weight, portability, larger image sensor and aperture, and can deliver better background blur effects.

[0003] Existing full-frame large-aperture lenses suffer from various aberrations and low resolution in imaging certain wavelengths. Utility Model Content

[0004] Therefore, the technical problem to be solved by this application is to overcome the defects of existing full-frame large aperture lenses in imaging some bands, such as various aberrations, low resolution, and high cost, so as to provide a full-frame large aperture lens.

[0005] To solve the above-mentioned technical problems, the technical solution of this application is as follows:

[0006] A full-frame, large-aperture lens includes a first lens group, a second lens group, a third lens group, and a fourth lens group arranged sequentially along the optical axis from the object side to the image side; the focal lengths of all lens groups satisfy the following condition:

[0007] -3.2<f(G1) / f(G2-G4)<-1.7;

[0008] -3.4<f(G3) / f(G2-G4)<-1.9;

[0009] -3.3 < f(G1) / f < -1.8;

[0010] 1.3<f(G4) / f(G2-G4)<2.5;

[0011] Where f(G1) represents the focal length of the first lens group, f(G2-G4) represents the combined focal length of the second to fourth lens groups, f(G3) represents the focal length of the third lens group, f(G4) represents the focal length of the fourth lens group, and f represents the combined focal length of all lens groups.

[0012] Furthermore, an aperture stop is provided between the first lens group and the second lens group, and the third lens group can move along the direction of the optical axis to achieve focusing.

[0013] Furthermore, the first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side;

[0014] The first lens is a meniscus negative power lens with its convex surface facing the object side;

[0015] The second lens is a meniscus positive power lens with its convex surface facing the object side;

[0016] The third lens is a meniscus negative power lens with its convex surface facing the object side;

[0017] The fourth lens is a meniscus negative power lens with its convex surface facing the image side;

[0018] The fifth lens is a biconvex positive power lens;

[0019] The sixth lens is a biconcave negative power lens;

[0020] The seventh lens is a biconvex positive power lens;

[0021] The second lens and the third lens have their adjacent surfaces glued together; the sixth lens and the seventh lens have their adjacent surfaces glued together.

[0022] Furthermore, the second lens group includes an eighth lens; the eighth lens is a biconvex positive power lens.

[0023] Furthermore, the third lens group includes a ninth lens; the ninth lens is a meniscus negative power lens with its convex surface facing the object side.

[0024] Furthermore, the fourth lens group includes a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged sequentially along the optical axis from the object side to the image side;

[0025] The tenth lens is a meniscus negative power lens with its convex surface facing the object side;

[0026] The eleventh lens is a biconvex positive power lens;

[0027] The twelfth lens is a biconvex positive power lens;

[0028] The thirteenth lens is a biconcave positive power lens;

[0029] The fourteenth lens is a meniscus positive power lens;

[0030] The fifteenth lens is a biconvex positive power lens;

[0031] The sixteenth lens is a biconcave positive power lens.

[0032] The adjacent surfaces of the tenth lens and the eleventh lens are glued together; the adjacent surfaces of the twelfth lens and the thirteenth lens are glued together; the adjacent surfaces of the fifteenth lens and the sixteenth lens are glued together.

[0033] Furthermore, the fifth lens, the ninth lens, and the fourteenth lens are all aspherical lenses, while the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are all spherical lenses.

[0034] Furthermore, the aperture of the full-frame large aperture lens is f / 1-1.6, and the field of view 2ω of the full-frame large aperture lens is 55°-75°.

[0035] Furthermore, the focal length of the full-frame large-aperture lens is 20mm-40mm.

[0036] Furthermore, the total optical length of the full-frame large-aperture lens does not exceed 110mm.

[0037] The technical solution of this application has the following advantages: the full-frame large aperture lens corrects various aberrations in various bands, so that the center and edge fields of view have sufficient resolution. It has the advantages of simple structure, small size and large aperture, and can achieve high resolution imaging from infinity to close distance. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the cross-sectional structure of a full-frame large-aperture lens in an embodiment of this application;

[0040] Figure 2 This is a field curvature diagram of a full-frame large-aperture lens in an embodiment of this application;

[0041] Figure 3 This is a distortion diagram of a full-frame large-aperture lens in an embodiment of this application.

[0042] Explanation of reference numerals in the attached diagram: G1, first lens group; G2, second lens group; G3, third lens group; G4, fourth lens group; 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, sixth lens; 7, seventh lens; 8, eighth lens; 9, ninth lens; 10, tenth lens; 11, eleventh lens; 12, twelfth lens; 13, thirteenth lens; 14, fourteenth lens; 15, fifteenth lens; 16, sixteenth lens. Detailed Implementation

[0043] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] like Figure 1 The illustrated full-frame large-aperture lens includes a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 arranged sequentially along the optical axis from the object side to the image side; the focal lengths of all lens groups satisfy the following condition:

[0047] -3.2<f(G1) / f(G2-G4)<-1.7;

[0048] -3.4<f(G3) / f(G2-G4)<-1.9;

[0049] -3.3 < f(G1) / f < -1.8;

[0050] 1.3<f(G4) / f(G2-G4)<2.5;

[0051] Where f(G1) represents the focal length of the first lens group G1, f(G2-G4) represents the combined focal length of the second lens group G2 to the fourth lens group G4, f(G3) represents the focal length of the third lens group G3, f(G4) represents the focal length of the fourth lens group G4, and f represents the combined focal length of all lens groups.

[0052] In this embodiment, the first lens group G1 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged sequentially along the optical axis from the object side to the image side. Specifically, the first lens 1 is a meniscus negative power lens with its convex surface facing the object side; the second lens 2 is a meniscus positive power lens with its convex surface facing the object side; the third lens 3 is a meniscus negative power lens with its convex surface facing the object side; the fourth lens 4 is a meniscus negative power lens with its convex surface facing the image side; the fifth lens 5 is a biconvex positive power lens; the sixth lens 6 is a biconcave negative power lens; and the seventh lens 7 is a biconvex positive power lens.

[0053] The second lens group G2 includes an eighth lens 8, which is a biconvex positive power lens. The third lens group G3 includes a ninth lens 9, which is a meniscus negative power lens with its convex surface facing the object side.

[0054] The fourth lens group G4 includes a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, and a sixteenth lens 16 arranged sequentially along the optical axis from the object side to the image side. Among them, the tenth lens 10 is a meniscus negative power lens with its convex surface facing the object side, the eleventh lens 11 is a biconvex positive power lens, the twelfth lens 12 is a biconvex positive power lens, the thirteenth lens 13 is a biconcave positive power lens, the fourteenth lens 14 is a meniscus positive power lens, the fifteenth lens 15 is a biconvex positive power lens, and the sixteenth lens 16 is a biconcave positive power lens.

[0055] In this embodiment, an aperture stop is provided between the first lens group G1 and the second lens group G2, and the third lens group G3 can move along the direction of the optical axis to achieve focusing. The third lens group G3 only has a single ninth lens 9 for focusing, making focusing more convenient and simple.

[0056] In this embodiment, the fifth lens 5, the ninth lens 9, and the fourteenth lens 14 are all aspherical lenses, while the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the sixth lens 6, the seventh lens 7, the eighth lens 8, the tenth lens 10, the eleventh lens 11, the twelfth lens 12, and the thirteenth lens 13 are all spherical lenses. This type of lens can effectively correct aberrations such as spherical aberration and field curvature, and can reduce the overall weight of the lens.

[0057] In some embodiments, adjacent surfaces of the second lens 2 and the third lens 3 are cemented together. Adjacent surfaces of the sixth lens 6 and the seventh lens 7 are cemented together. Adjacent surfaces of the tenth lens 10 and the eleventh lens 11 are cemented together. Adjacent surfaces of the twelfth lens 12 and the thirteenth lens 13 are cemented together. Adjacent surfaces of the fifteenth lens 15 and the sixteenth lens 16 are cemented together. This cemented lens combination effectively corrects chromatic aberration, resulting in more realistic colors in the captured image.

[0058] In this embodiment, the aperture of the full-frame large-aperture lens is f / 1-1.6, and the focal length is 20mm-40mm. The field of view 2ω of the full-frame large-aperture lens is 55°-75°. The total optical length of the full-frame large-aperture lens does not exceed 110mm.

[0059] The relevant parameters of each lens are shown in Table 1 below:

[0060]

[0061]

[0062] Table 1

[0063] like Figure 1 As shown in the embodiment of this application, the ninth lens 9 can move along the optical axis between the eighth lens 8 and the tenth lens 10 for focusing. Since the ninth lens 9 focuses internally, the overall length of the lens can remain unchanged when the lens adjusts its focal length.

[0064] This full-frame, large-aperture lens corrects various aberrations across different wavelengths, ensuring sufficient resolution in both the center and edge fields of view. It boasts advantages such as simple structure, small size, and large aperture, and can achieve high-resolution imaging from infinity to close distances.

[0065] Depend on Figure 2 and Figure 3 It can be seen that the full-frame large-aperture lens produces a meridian (corresponding to) for the light. Figure 2 The direction of T) and the arc (corresponding to) Figure 2 The field curvature in the mid-S direction is between -0.2mm and 0.2mm; the maximum distortion of a full-frame large-aperture lens is within 2%.

[0066] It should be noted that this full-frame large-aperture lens adopts an integrated design, achieving a miniaturized lens while obtaining excellent optical performance such as high resolution, low breathing, and low distortion at a very cost-effective price. It can be designed to match the lens mounts of various brands of cameras on the market according to actual usage needs, so as to achieve personalized customization and universal compatibility.

[0067] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A full-frame large-aperture lens, characterized in that, It includes a first lens group (G1), a second lens group (G2), a third lens group (G3), and a fourth lens group (G4) arranged sequentially along the optical axis from the object side to the image side; the focal lengths of all lens groups satisfy the following condition: -3.2<f(G1) / f(G2-G4)<-1.7; -3.4<f(G3) / f(G2-G4)<-1.9; -3.3 < f(G1) / f < -1.8; 1.3<f(G4) / f(G2-G4)<2.5; Where f(G1) represents the focal length of the first lens group (G1), f(G2-G4) represents the combined focal length of the second lens group (G2) to the fourth lens group (G4), f(G3) represents the focal length of the third lens group (G3), f(G4) represents the focal length of the fourth lens group (G4), and f represents the combined focal length of all lens groups.

2. The full-frame large-aperture lens according to claim 1, characterized in that, An aperture stop is provided between the first lens group (G1) and the second lens group (G2), and the third lens group (G3) can move along the direction of the optical axis to achieve focusing.

3. The full-frame large-aperture lens according to claim 1, characterized in that, The first lens group (G1) includes a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), and a seventh lens (7) arranged sequentially along the optical axis from the object side to the image side; The first lens (1) is a meniscus negative power lens with its convex surface facing the object side; The second lens (2) is a meniscus positive power lens with its convex surface facing the object side; The third lens (3) is a meniscus negative power lens with its convex surface facing the object side; The fourth lens (4) is a meniscus negative power lens with its convex surface facing the image side; The fifth lens (5) is a biconvex positive power lens; The sixth lens (6) is a biconcave negative power lens; The seventh lens (7) is a biconvex positive power lens; The second lens (2) and the third lens (3) are glued together on their adjacent sides; the sixth lens (6) and the seventh lens (7) are glued together on their adjacent sides.

4. The full-frame large-aperture lens according to claim 3, characterized in that, The second lens group (G2) includes an eighth lens (8); the eighth lens (8) is a biconvex positive power lens.

5. The full-frame large-aperture lens according to claim 4, characterized in that, The third lens group (G3) includes a ninth lens (9); the ninth lens (9) is a meniscus negative power lens with its convex surface facing the object side.

6. The full-frame large-aperture lens according to claim 5, characterized in that, The fourth lens group (G4) includes a tenth lens (10), an eleventh lens (11), a twelfth lens (12), a thirteenth lens (13), a fourteenth lens (14), a fifteenth lens (15), and a sixteenth lens (16) arranged sequentially along the optical axis from the object side to the image side; The tenth lens (10) is a meniscus negative power lens with its convex surface facing the object side; The eleventh lens (11) is a biconvex positive power lens; The twelfth lens (12) is a biconvex positive power lens; The thirteenth lens (13) is a biconcave positive power lens; The fourteenth lens (14) is a meniscus positive power lens; The fifteenth lens (15) is a biconvex positive power lens; The sixteenth lens (16) is a biconcave positive power lens; The adjacent surfaces of the tenth lens (10) and the eleventh lens (11) are glued together; the adjacent surfaces of the twelfth lens (12) and the thirteenth lens (13) are glued together; the adjacent surfaces of the fifteenth lens (15) and the sixteenth lens (16) are glued together.

7. The full-frame large-aperture lens according to claim 6, characterized in that, The fifth lens (5), the ninth lens (9) and the fourteenth lens (14) are all aspherical lenses, while the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the sixth lens (6), the seventh lens (7), the eighth lens (8), the tenth lens (10), the eleventh lens (11), the twelfth lens (12) and the thirteenth lens (13) are all spherical lenses.

8. The full-frame large-aperture lens according to claim 1, characterized in that, The aperture of the full-frame large-aperture lens is f / 1-1.6, and the field of view 2ω of the full-frame large-aperture lens is 55°-75°.

9. The full-frame large-aperture lens according to claim 1, characterized in that, The focal length of the full-frame large-aperture lens is 20mm-40mm.

10. The full-frame large-aperture lens according to claim 1, characterized in that, The total optical length of the full-frame large-aperture lens shall not exceed 110mm.

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