A full-frame large aperture lens

Abstract

The utility model discloses a full frame large aperture lens, including first lens group, second lens group, third lens group, fourth lens group that set gradually from object side to image side along optical axis, the focal length of all lens group satisfies following conditional formula: 0.8 The full frame large aperture lens corrects various aberrations of various wave bands, has sufficient resolution of central and edge field of view, has the advantages of simple structure, small size and large aperture, and can realize high resolution of imaging from infinite distance to close distance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens, in particular to a full-frame large aperture lens. BACKGROUND

[0002] In recent years, although the multi-function of mobile phones has replaced the daily shooting of card cameras, in the view of photography enthusiasts who have higher shooting requirements, micro-single cameras can experience more perfect photography fun. Micro-single cameras have 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 lens has the problems of various aberrations and low resolution in imaging of some wave bands. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art, and to provide a full-frame large aperture lens.

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defects in the prior art, and to provide a full-frame large aperture lens.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows:

[0007] A full-frame large aperture 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 lengths of all lens groups satisfy the following conditional expressions:

[0008] 0.8 < f(G1) / f(G2-G4) < 2.4;

[0009] -2.2 < f(G3) / f(G2-G4) < -0.7;

[0010] 1.2 < f(G1) / f < 3.6;

[0011] 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 lens groups.

[0012] 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.

[0013] Further, the first lens group comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

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

[0015] The second lens is a meniscus type negative lens with the convex surface facing the object side.

[0016] The third lens is a meniscus type positive lens with the convex surface facing the object side.

[0017] The fourth lens is a meniscus type negative lens with the convex surface facing the object side.

[0018] The fifth lens is a double-concave type negative lens.

[0019] The sixth lens is a double-convex type positive lens.

[0020] The seventh lens is a double-convex type positive lens.

[0021] The adjacent surface of the third lens and the fourth lens is cemented together.

[0022] Further, the second lens group comprises, in order from the object side to the image side along the optical axis, an eighth lens, a ninth lens, and a tenth lens.

[0023] The eighth lens is a double-concave type negative lens.

[0024] The ninth lens is a double-convex type positive lens.

[0025] The tenth lens is a double-convex type positive lens.

[0026] The adjacent surface of the eighth lens and the ninth lens is cemented together.

[0027] Further, the third lens group comprises an eleventh lens; the eleventh lens is a meniscus type negative lens with the convex surface facing the object side.

[0028] Further, the fourth lens group comprises, in order from the object side to the image side along the optical axis, a twelfth lens, a thirteenth lens, and a fourteenth lens; the twelfth lens is a double-convex type positive lens; the thirteenth lens is a double-convex type positive lens; the fourteenth lens is a double-concave type negative lens; the adjacent surface of the thirteenth lens and the fourteenth lens is cemented together.

[0029] Further, 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.

[0030] Further, the aperture of the full-frame large aperture lens is 1-1.6, and the field of view angle 2ω of the full-frame large aperture lens is 55°-75°.

[0031] Further, the focal length of the full-frame large aperture lens is 20mm-40mm.

[0032] Further, the total optical length of the full-frame large aperture lens is not more than 125mm.

[0033] The full-frame large aperture lens has the advantages that the various aberrations of various wave bands are corrected, the central and edge fields have sufficient resolution, the structure is simple, the volume is small, the aperture is large, and high resolution imaging can be realized from infinity to close distance. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the specific embodiment of the present application or the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0035] Figure 1 It is a cross-sectional structure schematic view of the full-frame large aperture lens in the embodiment of the present application.

[0036] Figure 2 It is a field curvature graph of the full-frame large aperture lens in the embodiment of the present application.

[0037] Figure 3 It is a distortion graph of the full-frame large aperture lens in the embodiment of the present application.

[0038] 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. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] 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:

[0043] 0.8<f(G1) / f(G2-G4)<2.4;

[0044] -2.2<f(G3) / f(G2-G4)<-0.7;

[0045] 1.2 < f(G1) / f < 3.6;

[0046] 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.

[0047] In the embodiment, the first lens group G1 is sequentially provided with the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 along the optical axis from the object side to the image side.

[0048] The first lens 1 is a meniscus type negative lens with the convex surface facing the object side; the second lens 2 is a meniscus type negative lens with the convex surface facing the object side; the third lens 3 is a meniscus type positive lens with the convex surface facing the object side; the fourth lens 4 is a meniscus type negative lens with the convex surface facing the object side; the fifth lens 5 is a double-concave type negative lens; the sixth lens 6 is a double-convex type positive lens; and the seventh lens 7 is a double-convex type positive lens.

[0049] The second lens group G2 includes the eighth lens 8, the ninth lens 9 and the tenth lens 10 sequentially provided along the optical axis from the object side to the image side. The eighth lens 8 is a double-concave type negative lens; the ninth lens 9 is a double-convex type positive lens; and the tenth lens 10 is a double-convex type positive lens.

[0050] The third lens group G3 includes the eleventh lens 11, which is a meniscus type negative lens with the convex surface facing the object side.

[0051] The fourth lens group G4 includes the twelfth lens 12, the thirteenth lens 13 and the fourteenth lens 14 sequentially provided along the optical axis from the object side to the image side. The twelfth lens 12 is a double-convex type positive lens; the thirteenth lens 13 is a double-convex type positive lens; and the fourteenth lens 14 is a double-concave type negative lens.

[0052] 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 G3 only has the single-piece eleventh lens 11 as the focusing function, and the focusing is more convenient and simple.

[0053] In the embodiment, the second lens 2, the tenth lens 10 and the eleventh lens 11 are all 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 all spherical lenses. Such a lens can effectively correct aberrations such as spherical aberration and field curvature, and can reduce the overall weight of the lens.

[0054] In some embodiments, the adjacent surfaces of the third lens 3 and the fourth lens 4 are glued together, the adjacent surfaces of the eighth lens 8 and the ninth lens 9 are glued together, and the adjacent surfaces of the thirteenth lens 13 and the fourteenth lens 14 are glued together. Gluing the lens groups together can effectively correct chromatic aberration, making the color of the captured image more realistic.

[0055] In this embodiment, the aperture of the full-frame large-aperture lens is f / 1-1.6, and the focal length is 20mm-40mm; preferably, the focal length is 35mm. 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 125mm.

[0056] The relevant parameters of each lens are shown in Table 1 below:

[0057]

[0058]

[0059] Table 1

[0060] like Figure 1 As 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 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.

[0062] 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%.

[0063] 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.

[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 hyper-compact lens characterized in that, The lens comprises, 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); the focal lengths of all the lens groups satisfy the following conditional expressions: 0.8 < f(G1) / f(G2-G4) < 2.4; -2.2 < f(G3) / f(G2-G4) < -0.7; 1.2 < f(G1) / f < 3.6; 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. 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.

2. The full-frame hyper-compact lens according to claim 1, characterized in that, The first lens group (G1) comprises, 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).

3. The full-frame hyper-compact lens according to claim 1, wherein, 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 meniscus positive lens with the convex surface facing the object side. The fourth lens (4) is a meniscus negative lens with the convex surface facing the object side. The fifth lens (5) is a double-concave negative lens. The sixth lens (6) is a double-convex positive lens. The seventh lens (7) is a double-convex positive lens. The adjacent surface of the third lens (3) and the fourth lens (4) is glued together. 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).

4. The full-frame hyper-compact lens according to claim 3, characterized in that, The eighth lens (8) is a double-concave negative lens. The ninth lens (9) is a double-convex positive lens. The tenth lens (10) is a double-convex positive lens. The adjacent surface of the eighth lens (8) and the ninth lens (9) is glued together. The third lens group (G3) comprises an eleventh lens (11), which is a meniscus negative lens with the convex surface facing the object side.

5. The full-frame hyper-compact lens according to claim 4, characterized in that, 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; the fourteenth lens (14) is a double-concave negative lens; and the adjacent surface of the thirteenth lens (13) and the fourteenth lens (14) is glued together.

6. The full-frame hyper-compact lens according to claim 5, wherein, ​ 7. The full-frame hyper-compact lens according to claim 6, 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.

8. The full-frame hyper-compact lens of claim 1, wherein, The aperture of the full-frame large aperture lens is 1-1.6, and the field of view angle 2ω of the full-frame large aperture lens is 55-75°.

9. The full-frame hyper-compact lens of claim 1, wherein, The focal length of the full-frame large aperture lens is 20-40mm.

10. The full-frame hyper-compact lens of claim 1, wherein, The total optical length of the full-frame large aperture lens is not more than 125mm.

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