Large-aperture telephoto lens

Abstract

The utility model discloses a large-aperture telephoto lens, which belongs to the technical field of optical lenses and comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are sequentially arranged from an object side to an image side along an optical axis. The focal lengths of all the lens groups meet the following conditional expressions: 1 < f (G1) / f (G2-G4) < 2.9; f (G3) / f (G2-G4) is more than 0.4 and less than 1.1; 1.1 < f (G1) / f < 3.4. According to the large-aperture telephoto lens, various aberrations of various wavebands are corrected, the central field of view and the edge field of view have enough resolution, the large-aperture telephoto 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 utility model relates to the field of optical lens technology, specifically to a large aperture telephoto 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 large-aperture telephoto 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 utility model is to overcome the defects of existing large aperture telephoto lenses in imaging some bands, such as various aberrations, low resolution, and high cost, so as to provide a large aperture telephoto lens.

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

[0006] A large-aperture telephoto 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] 1 < f(G1) / f(G2-G4) < 2.9;

[0008] 0.4<f(G3) / f(G2-G4)<1.1;

[0009] 1.1 < f(G1) / f < 3.4;

[0010] 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, and f represents the combined focal length of all lens groups.

[0011] 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.

[0012] Furthermore, the first lens group includes a first lens, a second lens, a third lens, and a fourth lens (4) arranged sequentially along the optical axis from the object side to the image side;

[0013] The first lens is a meniscus positive power lens with its convex surface facing the object side;

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

[0015] The third lens is a biconvex positive power lens;

[0016] The fourth lens is a biconcave negative power lens.

[0017] Furthermore, the adjacent surfaces of the third lens and the fourth lens are glued together.

[0018] Furthermore, the second lens group includes a fifth lens and a sixth lens arranged sequentially along the optical axis from the object side to the image side;

[0019] The fifth lens is a biconvex positive power lens;

[0020] The sixth lens is a meniscus negative power lens with its convex surface facing the object side.

[0021] Furthermore, the third lens group includes a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially along the optical axis from the object side to the image side;

[0022] The seventh lens is a meniscus positive power lens with its convex surface facing the object side;

[0023] The eighth lens is a biconcave negative power lens;

[0024] The ninth lens is a biconcave negative power lens;

[0025] The tenth lens is a biconvex positive power lens;

[0026] The eleventh lens is a meniscus positive power lens with its convex surface facing the image side.

[0027] The twelfth lens is a meniscus negative power lens with its convex surface facing the image side;

[0028] The thirteenth lens is a meniscus or plano-convex positive power lens with its convex surface facing the image side.

[0029] Furthermore, the adjacent surfaces of the ninth lens and the tenth lens are glued together; and / or, the adjacent surfaces of the eleventh lens and the twelfth lens are glued together.

[0030] Furthermore, the fourth lens group includes a fourteenth lens, a fifteenth lens, and a sixteenth lens arranged sequentially along the optical axis from the object side to the image side;

[0031] The fourteenth lens is a biconvex positive power lens;

[0032] The fifteenth lens is a biconcave negative power lens;

[0033] The sixteenth lens is a meniscus negative power lens with its convex surface facing the image side;

[0034] The adjacent surfaces of the fourteenth lens and the fifteenth lens are glued together.

[0035] Furthermore, the eleventh lens is an aspherical lens, while the remaining lenses are all spherical lenses.

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

[0037] The present invention has the following advantages: the large aperture telephoto lens corrects various aberrations in each band, 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 specific embodiments of this utility model or the technical solutions in 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 utility model. 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 the large aperture telephoto lens in this embodiment of the present invention;

[0040] Figure 2 This is a field curvature diagram of the large aperture telephoto lens in this embodiment of the present invention;

[0041] Figure 3 This is a distortion diagram of the large aperture telephoto lens in the embodiment of this utility model.

[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 solution of this utility model 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 utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. 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] like Figure 1 The large-aperture telephoto lens shown 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:

[0046] 1 < f(G1) / f(G2-G4) < 2.9;

[0047] 0.4<f(G3) / f(G2-G4)<1.1;

[0048] 1.1 < f(G1) / f < 3.4;

[0049] 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, and f represents the combined focal length of all lens groups.

[0050] In this embodiment, the first lens group G1 includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 arranged sequentially along the optical axis from the object side to the image side. Specifically, the first lens 1 is a meniscus positive 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 biconvex positive power lens; and the fourth lens 4 is a biconcave negative power lens.

[0051] The second lens group G2 includes a fifth lens 5 and a sixth lens 6 arranged sequentially along the optical axis from the object side to the image side. The fifth lens 5 is a biconvex positive power lens; the sixth lens 6 is a meniscus negative power lens with its convex surface facing the object side.

[0052] The third lens group includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, and a thirteenth lens 13 arranged sequentially along the optical axis from the object side to the image side. Among them, the seventh lens 7 is a meniscus positive power lens with its convex surface facing the object side; the eighth lens 8 is a biconcave negative power lens; the ninth lens 9 is a biconcave negative power lens; the tenth lens 10 is a biconvex positive power lens; the eleventh lens 11 is a meniscus positive power lens with its convex surface facing the image side; the twelfth lens 12 is a meniscus negative power lens with its convex surface facing the image side; and the thirteenth lens 13 is a meniscus or plano-convex positive power lens with its convex surface facing the image side.

[0053] The fourth lens group G4 includes 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 fourteenth lens 14 is a biconvex positive power lens; the fifteenth lens 15 is a biconcave negative power lens; and the sixteenth lens 16 is a meniscus negative power lens with its convex surface facing the image side.

[0054] 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 optical axis to achieve focusing. The third lens group G3 has 7 lenses for focusing, which better balances the performance at various object distances.

[0055] In this embodiment, the eleventh lens 11 is an aspherical lens; the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7, eighth lens 8, ninth lens 9, tenth lens 10, twelfth lens 12, thirteenth lens 13, fourteenth lens 14, fifteenth lens 15, and sixteenth lens 16 are all spherical lenses. Aspherical lenses can effectively correct aberrations such as spherical aberration and field curvature, and can reduce the overall weight of the lens.

[0056] In this embodiment, the adjacent surfaces of the third lens 3 and the fourth lens 4 are cemented together; the adjacent surfaces of the ninth lens 9 and the tenth lens 10 are cemented together; the adjacent surfaces of the eleventh lens 11 and the twelfth lens 12 are cemented together; and the adjacent surfaces of the fourteenth lens 14 and the fifteenth lens 15 are cemented together. This cemented lens combination effectively corrects chromatic aberration, resulting in more realistic colors in the captured image.

[0057] In this embodiment, the aperture of the large-aperture telephoto lens is f / 1-1.6. The large-aperture telephoto lens is a fixed-focus lens with a focal length in the range of 60mm-80mm, and the total optical length of the large-aperture telephoto lens does not exceed 110mm.

[0058] The relevant parameters of each lens are shown in Table 1 below:

[0059]

[0060] Table 1

[0061] like Figure 1 As shown in this embodiment of the invention, the seventh lens 7 to the thirteenth lens 13 can be moved along the optical axis between the sixth lens 6 and the fourteenth lens 14 for focusing. Due to internal focusing, the overall length of the lens remains constant when adjusting the focal length.

[0062] Depend on Figure 2 and Figure 3 It can be seen that a large aperture telephoto lens produces a meridian (corresponding to) light. Figure 2 The direction of T) and the arc (corresponding to) Figure 2 The field curvature in the mid-S direction is between -0.1mm and 0.1mm; the maximum distortion of a large aperture telephoto lens is within ±5%.

[0063] This type of large-aperture telephoto 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.

[0064] It should be noted that this large-aperture telephoto 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.

[0065] 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 protection scope of this invention.

Claims

1. A large aperture telephoto lens characterized by comprising: 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: 1 < f(G1) / f(G2-G4) < 2.9; 0.4<f(G3) / f(G2-G4)<1.1; 1.1 < f(G1) / f < 3.4; 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), and f represents the combined focal length of all lens groups.

2. The large-aperture telephoto lens according to claim 1, characterized by, 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 large-aperture telephoto lens according to claim 1, characterized by, The first lens group (G1) includes a first lens (1), a second lens (2), a third lens (3), and a fourth lens (4) arranged sequentially along the optical axis from the object side to the image side; The first lens (1) is a meniscus positive 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 biconvex positive power lens; The fourth lens (4) is a biconcave negative power lens.

4. The large-aperture telephoto lens according to claim 3, characterized by, The adjacent sides of the third lens (3) and the fourth lens (4) are glued together.

5. The large-aperture telephoto lens of claim 1, wherein The second lens group (G2) includes a fifth lens (5) and a sixth lens (6) arranged sequentially from the object side to the image side along the optical axis; The fifth lens (5) is a biconvex positive power lens; The sixth lens (6) is a meniscus negative power lens with its convex surface facing the object side.

6. The large-aperture telephoto lens of claim 1, wherein The third lens group (G3) includes a seventh lens (7), an eighth lens (8), a ninth lens (9), a tenth lens (10), an eleventh lens (11), a twelfth lens (12), and a thirteenth lens (13) arranged sequentially along the optical axis from the object side to the image side; The seventh lens (7) is a meniscus positive power lens with its convex surface facing the object side; The eighth lens (8) is a biconcave negative power lens; The ninth lens (9) is a biconcave negative power lens; The tenth lens (10) is a biconvex positive power lens; The eleventh lens (11) is a meniscus positive power lens with its convex surface facing the image side; The twelfth lens (12) is a meniscus negative power lens with its convex surface facing the image side; The thirteenth lens (13) is a meniscus or plano-convex positive power lens with its convex surface facing the image side.

7. The large-aperture telephoto lens according to claim 6, characterized by, The adjacent surfaces of the ninth lens (9) and the tenth lens (10) are glued together; and / or, the adjacent surfaces of the eleventh lens (11) and the twelfth lens (12) are glued together.

8. The large-aperture telephoto lens of claim 1, wherein, The fourth lens group (G4) includes 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 fourteenth lens (14) is a biconvex positive power lens; The fifteenth lens (15) is a biconcave negative power lens; The sixteenth lens (16) is a meniscus negative power lens with its convex surface facing the image side; The fourteenth lens (14) and the fifteenth lens (15) are glued together on adjacent sides.

9. The large aperture telephoto lens according to claim 6, characterized in that, The eleventh lens (11) is an aspherical lens, while the other lenses are all spherical lenses.

10. The large-aperture telephoto lens of claim 1, wherein, The total optical length of the large-aperture telephoto lens shall not exceed 110mm.

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