A full-frame large aperture wide-angle lens

Abstract

The utility model discloses a full frame large aperture wide-angle lens, including first lens group, second lens group, third lens group, fourth lens group that set gradually from object side to image side along the optical axis, the focal length of all lens groups satisfies the following conditional formula: 0.3 < f (G1) / f (G2-G4) <1.3, -1.9 < f (G3) / f (G2-G4) < -0.4, 0.9 < f (G1) / f < 3.4, wherein, f (G1) represents the focal length of first lens group, f (G2-G4) represents the combination focal length from second lens group to fourth lens group, f (G3) represents the focal length of third lens group, f represents the combination focal length of all lens groups. This full frame large aperture wide-angle lens corrects various aberrations of each wave band, makes the center and edge field of view have enough resolution, has the advantages of simple structure, small volume, large aperture, and can realize high resolution of object distance from infinity to close distance imaging.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical lens technical field, concretely relates to a full frame large aperture wide-angle lens. BACKGROUND

[0002] In recent years, although the multifunction of mobile phone has replaced the daily shooting of card camera, in the view of photography lovers who have higher shooting requirements, micro single camera can experience perfect photography fun. Micro single camera has the advantages of small size, light weight, convenient carrying, larger image surface and aperture, and can experience better background blur effect.

[0003] The existing full frame large aperture wide-angle lens has the problems of various aberrations and low resolution in imaging of some wave bands. UTILITY MODEL CONTENT

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

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] A full frame large aperture wide-angle lens comprises a first lens group, a second lens group, a third lens group and a fourth lens group arranged in sequence along an optical axis from an object side to an image side; the focal length of all the lens groups satisfies the following conditional expression:

[0007] 0.3<f(G1) / f(G2-G4)<1.3;

[0008] -1.9<f(G3) / f(G2-G4)<-0.4;

[0009] 0.9<f(G1) / f<3.4;

[0010] Wherein f(G1) represents the focal length of the first lens group, f(G2-G4) represents the combined focal length of the second lens group to the fourth lens group, f(G3) represents the focal length of the third lens group, and f represents the combined focal length of all the lens groups.

[0011] Further, a diaphragm is arranged 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 realize focusing.

[0012] Further, the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical axis from the object side to the image side.

[0013] The first lens is a meniscus type negative lens with a convex surface facing the object side;

[0014] The second lens is a meniscus type negative lens with a convex surface facing the object side;

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

[0016] The fourth lens is a biconcave type negative lens;

[0017] The fifth lens is a meniscus type negative lens with a convex surface facing the image side;

[0018] The sixth lens is a biconvex type positive lens;

[0019] The seventh lens is a biconvex type positive lens;

[0020] The third lens and the fourth lens are adjacent to each other and are glued together.

[0021] Further, the second lens group comprises an eighth lens, a ninth lens and a tenth lens arranged in sequence from the object side to the image side along the optical axis;

[0022] The eighth lens is a biconcave type negative lens;

[0023] The ninth lens is a biconvex type positive lens;

[0024] The tenth lens is a biconvex type positive lens;

[0025] The eighth lens and the ninth lens are adjacent to each other and are glued together.

[0026] Further, the third lens group comprises an eleventh lens; the eleventh lens is a meniscus type negative lens with a convex surface facing the object side.

[0027] Further, the fourth lens group comprises a twelfth lens, a thirteenth lens and a fourteenth lens; the twelfth lens is a biconvex type positive lens; the thirteenth lens is a biconvex type positive lens; and the fourteenth lens is a biconcave type negative lens.

[0028] Further, the second lens and the thirteenth lens are aspherical lenses, the second lens, the tenth lens and the eleventh lens are aspherical lenses, and the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the twelfth lens, the thirteenth lens and the fourteenth lens are spherical lenses.

[0029] Further, the aperture of the full-frame large aperture wide-angle lens is 1-1.6, and the focal length of the full-frame large aperture wide-angle lens is 18mm-40mm.

[0030] Further, the field angle 2ω of the full-frame large aperture wide-angle lens is 60°-95°.

[0031] Further, the total optical length of the full-frame large aperture wide-angle lens is not more than 125mm.

[0032] The full-frame large aperture wide-angle lens has the advantages of simple structure, small size, large aperture, and can realize high resolution of imaging from infinity to close distance. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0034] Figure 1 It is a sectional structure schematic view of the full-frame large aperture wide-angle lens in the embodiment of the utility model.

[0035] Figure 2 It is a spherical aberration diagram of the full-frame large aperture wide-angle lens in the embodiment of the utility model.

[0036] Figure 3 It is a field curvature distortion diagram of the full-frame large aperture wide-angle lens in the embodiment of the utility model.

[0037] Explanation of reference signs: 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. EMBODIMENT

[0038] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] As shown in the drawings Figure 1 A full-frame large-aperture wide-angle lens, comprising a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 arranged in order from the object side to the image side along the optical axis; the focal length of all lens groups satisfies the following conditional expression:

[0041] 0.3<f(G1) / f(G2-G4)<1.3;

[0042] -1.9<f(G3) / f(G2-G4)<-0.4;

[0043] 0.9<f(G1) / f<3.4;

[0044] Wherein, 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.

[0045] 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 in order from the object side to the image side along the optical axis. The first lens 1 is a meniscus negative power lens with the convex surface facing the object side; the second lens 2 is a meniscus negative power lens with the convex surface facing the object side; the third lens 3 is a double-convex positive power lens; the fourth lens 4 is a double-concave negative power lens; the fifth lens 5 is a meniscus negative power lens with the convex surface facing the image side; the sixth lens 6 is a double-convex positive power lens; and the seventh lens 7 is a double-convex positive power lens.

[0046] The second lens group G2 comprises, in order from the object side to the image side along the optical axis, an eighth lens 8, a ninth lens 9, and a tenth lens 10; the eighth lens 8 is a double-concave negative lens; the ninth lens 9 is a double-convex positive lens; and the tenth lens 10 is a double-convex positive lens.

[0047] The third lens group G3 comprises an eleventh lens 11; the eleventh lens 11 is a meniscus negative lens with the convex surface facing the object side.

[0048] The fourth lens group G4 comprises, in order from the object side to the image side along the optical axis, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14; the twelfth lens 12 is a double-convex positive lens; the thirteenth lens 13 is a double-convex positive lens; and the fourteenth lens 14 is a double-concave negative lens.

[0049] In the embodiment, a diaphragm is arranged between the first lens group G1 and the second lens group G2, and the third lens group G3 is movable along the direction of the optical axis to realize focusing; the third lens group has only the single-piece eleventh lens 11 as the focusing function, and focusing is more convenient and simple.

[0050] Further, the second lens 2, the tenth lens 10, and the eleventh lens 11 are aspherical lenses, which can effectively correct aberrations such as spherical aberration and field curvature, and can reduce the overall weight of the lens.

[0051] Further, one side of the third lens 3 and the fourth lens 4 adjacent to each other is cemented together; one side of the eighth lens 8 and the ninth lens 9 adjacent to each other is cemented together; and one side of the thirteenth lens 13 and the fourteenth lens 14 adjacent to each other is cemented together. The cemented lens combination can effectively correct chromatic aberration, so that the color of the captured image is more realistic.

[0052] In the embodiment, the relevant parameters of each lens are shown in Table 1-1, Table 1-2, and Table 1-3:

[0053]

[0054]

[0055] Table 1-1

[0056]

[0057] Table 1-2

[0058]

[0059] Table 1-3

[0060] As Figure 1As shown, in this embodiment of the invention, the eleventh lens 11 can move along the optical axis between the tenth lens 10 and the twelfth lens 12 for focusing. Since focusing occurs within the twelfth lens 11, the overall length of the lens remains constant when adjusting the focal length.

[0061] This full-frame, large-aperture, wide-angle 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 near distance.

[0062] Depend on Figure 2 and Figure 3 It can be seen that a full-frame, large-aperture wide-angle lens produces light along a meridian (corresponding to...). 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 full-frame wide-angle lens with a large aperture is within 3%.

[0063] It should be noted that this large-aperture wide-angle lens adopts an integrated design, achieving high resolution, low breathing, low distortion and other excellent cost-effective optical performance while miniaturizing the lens. 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.

[0064] 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 full-frame, fast wide-angle lens characterized by, The lens includes, in order from the object side to the image side along the optical axis, a first lens group (G1), a second lens group (G2), a third lens group (G3), and a fourth lens group (G4); focal lengths of all the lens groups satisfy the following conditional expressions: 0.3 < f(G1) / f(G2-G4) < 1.3; -1.9 < f(G3) / f(G2-G4) < -0.4; 0.9 < f(G1) / f < 3.4; wherein 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 the lens groups; The first lens group (G1) includes, in order from the object side to the image side along the optical axis, 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); The first lens (1) is a meniscus negative lens with the convex surface facing the object side; The second lens (2) is a meniscus negative lens with the convex surface facing the object side; The third lens (3) is a biconvex positive lens; The fourth lens (4) is a biconcave negative lens; The fifth lens (5) is a meniscus negative lens with the convex surface facing the image side; The sixth lens (6) is a biconvex positive lens; The seventh lens (7) is a biconvex positive lens; The adjacent surface of the third lens (3) and the fourth lens (4) is glued together; The second lens group (G2) includes, in order from the object side to the image side along the optical axis, an eighth lens (8), a ninth lens (9), and a tenth lens (10); The eighth lens (8) is a biconcave negative lens; The ninth lens (9) is a biconvex positive lens; The tenth lens (10) is a biconvex positive lens; The adjacent surface of the eighth lens (8) and the ninth lens (9) is glued together; The third lens group (G3) includes an eleventh lens (11); the eleventh lens (11) is a meniscus negative lens with the convex surface facing the object side; The fourth lens group (G4) includes, in order from the object side to the image side along the optical axis, a twelfth lens (12), a thirteenth lens (13), and a fourteenth lens (14); the twelfth lens (12) is a biconvex positive lens; the thirteenth lens (13) is a biconvex positive lens; and the fourteenth lens (14) is a biconcave negative lens.

2. The full-frame hyper-wide-angle lens according to claim 1, characterized in that, A diaphragm is arranged between the first lens group (G1) and the second lens group (G2), and the third lens group (G3) is movable along the optical axis to achieve focusing.

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

4. The full-frame hyper-wide-angle lens according to claim 1, characterized in that, The aperture of the full-frame large aperture wide-angle lens is 1-1.6, and the focal length of the full-frame large aperture wide-angle lens is 18mm-40mm.

5. The full-frame hyper-wide-angle lens according to claim 1, characterized in that, The field of view angle 2ω of the full-frame large aperture wide-angle lens is 60°-95°.

6. The full-frame hyper-wide-angle lens according to claim 1, characterized in that, The total optical length of the full-frame large aperture wide-angle lens is not more than 125mm.

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