Wide-angle lens structure

Abstract

The utility model relates to the technical field of vehicle-mounted lenses, in particular to a wide-angle lens structure, which comprises an optical imaging lens group and a system diaphragm, and is characterized in that the optical imaging lens group is provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter which are sequentially arranged from an object space to an image space along an optical axis; the system diaphragm is positioned between the third lens and the fourth lens; the first lens has negative focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, and the sixth lens has positive focal power. The total lens length TTL of the wide-angle lens structure is less than or equal to 17mm. According to the utility model, the structure is novel, the small-sized optical lens with high pixel, large target surface and small volume is realized, and a glass-plastic mixed structure is adopted, so that the optical lens has better resolution; the utility model has the advantages of large target surface, high pixel and small volume.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted lenses, in particular to a wide-angle lens structure. Background Art

[0002] With the development of society, the application scope and scenarios of automobiles are gradually expanding, and the corresponding requirements for vehicle-mounted lenses are also getting higher and higher, mainly reflected in higher image quality, larger field of view, larger target surface and smaller volume. Currently available ultra-wide-angle lenses often have low image quality, small target surface and large volume. Therefore, in response to this phenomenon, it is necessary to develop an optical lens with high pixels, large target surface and small volume. Summary of the invention

[0003] The utility model aims at the problems in the prior art and provides a wide-angle lens structure with a novel structure, which realizes a small optical lens with high pixels, large target surface and small volume, and adopts a glass-plastic hybrid structure to have better resolution. The lens of the embodiment of the present application has an aperture number of 1.9 and a total length that satisfies TTL≤17mm at a low cost, and has the advantages of large target surface, high pixels and small volume.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model provides a wide-angle lens structure, which includes an optical imaging lens group and a system aperture, wherein the optical imaging lens group is sequentially arranged along the optical axis from the object side to the image side with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter; the system aperture is located between the third lens and the fourth lens;

[0006] The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the sixth lens has positive optical power;

[0007] The total lens length TTL of the wide-angle lens structure is ≤17 mm.

[0008] Preferably, the first lens is a convex-concave glass spherical lens, the second lens is a convex-concave or bi-concave plastic aspherical lens, the third lens is a bi-convex glass spherical lens, the fourth lens is a convex-concave plastic aspherical lens, the fifth lens is a concave-convex or bi-concave plastic aspherical lens, and the sixth lens is a convex-concave or bi-convex plastic aspherical lens.

[0009] Preferably, the fourth lens and the fifth lens are cemented lenses.

[0010] Preferably, the optical power of the first to sixth lenses meets the following conditions:

[0011]

[0012] in, are the optical powers of the first to sixth lenses respectively, is the optical power of the entire optical system.

[0013] Preferably, the refractive indexes of the first to sixth lenses satisfy the following conditions:

[0014] 1.80≤n1≤2.00;

[0015] 1.44≤n2≤1.64;

[0016] 1.82≤n3≤2.06;

[0017] 1.54≤n4≤1.74;

[0018] 1.44≤n5≤1.64;

[0019] 1.44≤n6≤1.64;

[0020] Among them, n1, n2, n3, n4, n5, and n6 represent the refractive indices of the first lens to the sixth lens in sequence.

[0021] Preferably, the Abbe constants of the first to sixth lenses satisfy the following conditions:

[0022] 25.2≤v1≤50.7;

[0023] 45.1≤v2≤65.1;

[0024] 16.5≤v3≤21.9;

[0025] 21.2≤v4≤22.5;

[0026] 45.9≤v5≤65.9;

[0027] 45.9≤v6≤65.9;

[0028] Among them, v1, v2, v3, v4, v5, and v6 represent the dispersion coefficients of the first lens to the sixth lens respectively.

[0029] Preferably, the image plane diameter IC of the wide-angle lens structure and the lens focal length f of the wide-angle lens structure satisfy the following condition: 0.23≤f / IC≤0.44.

[0030] Preferably, the back focus BFL of the wide-angle lens structure and the total length TTL of the wide-angle lens structure satisfy the following condition: BFL / TTL≥0.14.

[0031] Preferably, the aperture number F of the wide-angle lens structure satisfies the following conditions:

[0032] 1.90≤F≤2.20.

[0033] Beneficial effects of the utility model:

[0034] The utility model has a novel structure and realizes a small optical lens with high pixels, large target surface and small volume. It adopts a glass-plastic hybrid structure to have better resolution. The lens of the embodiment of the present application has an aperture number of 1.9 at a low cost, a total length that satisfies TTL≤17mm, and has the advantages of large target surface, high pixels, and small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of a wide-angle lens structure in the first embodiment;

[0036] Figure 2 is a light aberration diagram of a wide-angle lens structure in the first embodiment;

[0037] Figure 3 is an optical path difference diagram of a wide-angle lens structure in the first embodiment;

[0038] Figure 4 is an MTF diagram of a wide-angle lens structure in the first embodiment;

[0039] Figure 5 is a schematic structural diagram of a wide-angle lens structure in the second embodiment;

[0040] Figure 6 A light aberration diagram of a wide-angle lens structure in the second embodiment;

[0041] Figure 7 This is an optical path difference diagram of a wide-angle lens structure in the second embodiment;

[0042] Figure 8 This is an MTF diagram of a wide-angle lens structure in the second embodiment;

[0043] Fig. 9 is a schematic structural diagram of a wide-angle lens structure in the third embodiment;

[0044] Fig.10 This is a light aberration diagram of a wide-angle lens structure in the third embodiment;

[0045] Fig.11 This is an optical path difference diagram of a wide-angle lens structure in the third embodiment;

[0046] Fig.12This is an MTF diagram of a wide-angle lens structure in the third embodiment.

[0047] exist Figures 1 to 12 Reference numerals in the drawings include:

[0048] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Filter; 8. System aperture. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model. It is understood that the drawings are only provided for reference and explanation, and are not used to limit the utility model.

[0050] All technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art of the present invention. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0051] Furthermore, the terms “first”, “second”, and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0052] like Figures 1 to 12 As shown, an embodiment of the present application provides a wide-angle lens structure, which includes an optical imaging lens group and a system aperture 8, wherein the optical imaging lens group is arranged in sequence from the object side to the image side along the optical axis with 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 filter 7; the system aperture 8 is located between the third lens and the fourth lens; the first lens 1 has a negative optical focal length, the second lens 2 has a negative optical focal length, the third lens 3 has a positive optical focal length, the fourth lens 4 has a negative optical focal length, the fifth lens 5 has a positive optical focal length, and the sixth lens 6 has a positive optical focal length; the total lens length TTL of the wide-angle lens structure is ≤17 mm; the aperture number F of the wide-angle lens structure satisfies the following conditions: 1.90≤F≤2.20.

[0053] In the embodiment of the present application, the first lens 1 is a convex-concave glass spherical lens, the second lens 2 is a convex-concave or bi-concave plastic aspherical lens, the third lens 3 is a bi-convex glass spherical lens, the fourth lens 4 is a convex-concave plastic aspherical lens, the fifth lens 5 is a concave-convex or bi-concave plastic aspherical lens, and the sixth lens 6 is a convex-concave or bi-convex plastic aspherical lens.

[0054] In the embodiment of the present application, the fourth lens 4 and the fifth lens 5 are cemented lenses.

[0055] In the embodiment of the present application, the optical power of the first lens 1 to the sixth lens 6 satisfies the following conditions:

[0056] in, are the optical powers of the first lens 1 to the sixth lens 6, is the optical power of the entire optical system.

[0057] In the embodiment of the present application, the refractive indices of the first lens 1 to the sixth lens 6 satisfy the following conditions: 1.80≤n1≤2.00; 1.44≤n2≤1.64; 1.82≤n3≤2.06; 1.54≤n4≤1.74; 1.44≤n5≤1.64; 1.44≤n6≤1.64; wherein n1, n2, n3, n4, n5, and n6 represent the refractive indices of the first lens 1 to the sixth lens 6 in order, respectively.

[0058] In the embodiment of the present application, the Abbe constants of the first lens 1 to the sixth lens 6 satisfy the following conditions: 25.2≤v1≤50.7; 45.1≤v2≤65.1; 16.5≤v3≤21.9; 21.2≤v4≤22.5; 45.9≤v5≤65.9; 45.9≤v6≤65.9; wherein v1, v2, v3, v4, v5, and v6 represent the dispersion coefficients of the first lens 1 to the sixth lens 6, respectively, in order.

[0059] In the embodiment of the present application, the image plane diameter IC of the wide-angle lens structure and the lens focal length f of the wide-angle lens structure satisfy the following condition: 0.23≤f / IC≤0.44.

[0060] In the embodiment of the present application, the back focus BFL of the wide-angle lens structure and the total length TTL of the wide-angle lens structure satisfy the following condition: BFL / TTL≥0.14.

[0061] The embodiment of the present application realizes a small optical lens with high pixels, large target area and small volume, and adopts a glass-plastic hybrid structure to have better resolution; the lens of the embodiment of the present application has an aperture number of up to 1.9 at a low cost, and a total length that satisfies TTL≤17mm, and has the advantages of large target area, high pixels, and small volume.

[0062] This application uses parameters corresponding to three examples for demonstration, as shown in Table 1 below:

[0063]

[0064] Table 1

[0065] The aspheric formula is as follows:

[0066]

[0067] Among them, z represents the axial vector height of the aspheric surface in the Z direction; r represents the distance from the point on the aspheric surface to the optical axis; c represents the curvature of the fitted sphere, which is the inverse of the radius of curvature; k represents the fitted cone coefficient; A, B, C, D, E, F, and G represent the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order coefficients of the aspheric polynomial, respectively.

[0068] Embodiment 1

[0069] In the first embodiment of the present application, the optical physical parameters of the first lens to the sixth lens are shown in Table 2 and Table 3 below:

[0070]

[0071] Table 2

[0072] Surface number k A B C D E F S3 -9.80E+00 -1.44E-03 9.95E-06 1.92E-05 -1.16E-06 S4 -8.32E-01 7.88E-03 -4.13E-04 -1.22E-04 4.75E-05 S8 -1.17E+02 -8.78E-02 4.79E-02 -7.28E-02 1.33E-01 -1.28E-01 4.65E-02 S9 -1.47E+00 -8.44E-02 8.59E-02 -9.90E-03 -4.33E-02 5.66E-02 -1.74E-02 S10 -4.48E-01 2.04E-04 -5.42E-03 4.51E-03 -1.10E-03 -1.65E-03 S11 6.20E+00 1.51E-02 6.92E-03 -1.05E-03 -1.23E-03 3.39E-04 S12 7.40E+01 2.69E-02 -1.14E-03 7.53E-03 -1.51E-03 -2.78E-04

[0073] Table 3

[0074] Specifically, the surface numbers in Tables 2 and 3 are numbered according to the surface order of each lens, wherein "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, "S4" represents the object side surface of the second lens, "S5" represents the image side surface of the second lens, and so on; "S13" represents the object side surface of the flat filter, and "S14" represents the image side surface of the flat filter; the radius of curvature represents the degree of curvature of the lens surface, a negative value represents that the surface is bent toward the image side, and a positive value represents that the surface is bent toward the object side, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, and the refractive index represents the ability of the material between the current surface and the next surface to deflect light; the dispersion coefficient represents the dispersion characteristics of the material between the current surface and the next surface to light.

[0075] Embodiment 2:

[0076] In the second embodiment of the present application, the optical physical parameters of the first lens to the sixth lens are shown in Table 4 and Table 5 below:

[0077]

[0078] Surface number k A B C D E F S3 3.65E+00 -4.18E-03 3.26E-05 1.02E-05 -4.98E-07 S4 -7.41E-01 7.97E-03 -1.10E-03 9.22E-04 -3.56E-04 8.00E-05 S8 -1.33E+03 -8.27E-02 5.88E-02 -7.97E-02 1.22E-01 -1.34E-01 6.14E-02 S9 -1.11E+00 -1.64E-01 -2.23E-02 9.86E-02 2.84E-02 -7.52E-02 5.27E-02 S10 -8.42E-02 1.94E-03 -6.91E-03 1.51E-03 4.22E-03 -8.04E-03 S11 -9.50E+00 -1.02E-02 -6.01E-03 3.84E-03 -6.44E-03 7.59E-04 S12 -4.62E+04 -2.06E-02 1.00E-02 -4.61E-03 -1.12E-03 4.77E-04

[0079] Table 5

[0080] Specifically, the surface numbers in Tables 4 and 5 are numbered according to the order of the surfaces of each lens, wherein "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, "S4" represents the object side surface of the second lens, "S5" represents the image side surface of the second lens, and so on; "S13" represents the object side surface of the flat filter, and "S14" represents the image side surface of the flat filter; the radius of curvature represents the degree of curvature of the lens surface, a negative value represents that the surface is bent toward the image side, and a positive value represents that the surface is bent toward the object side, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, and the refractive index represents the ability of the material between the current surface and the next surface to deflect light; the dispersion coefficient represents the dispersion characteristics of the material between the current surface and the next surface to light.

[0081] Embodiment three:

[0082] In the third embodiment of the present application, the optical physical parameters of the first lens to the sixth lens are shown in the following reference numeral 6 and Table 7:

[0083]

[0084]

[0085] Table 6

[0086] Surface number k A B C D E F S3 -1.44E+01 -6.71E-05 -5.77E-05 3.47E-06 -6.33E-08 S4 -7.00E-01 -1.79E-02 4.00E-03 2.43E-04 -3.98E-04 6.11E-05 S8 -3.53E+07 -4.51E-02 -1.36E-02 -9.18E-03 1.55E-01 -2.62E-01 1.40E-01 S9 -1.71E+00 -1.45E-01 6.09E-02 1.13E-02 1.24E-02 2.26E-01 -1.84E-01 S10 2.93E-01 -5.21E-03 9.71E-04 -1.31E-02 4.07E-03 -8.58E-03 S11 4.04E+00 -1.57E-03 -3.26E-03 -2.82E-03 -2.89E-03 1.97E-04 S12 3.15E+01 1.12E-02 2.77E-03 -1.80E-03 -1.78E-03 2.95E-04

[0087] Table 7

[0088] Specifically, the surface numbers in Tables 6 and 7 are numbered according to the surface order of each lens, wherein "S1" represents the object side surface of the first lens, "S2" represents the image side surface of the first lens, "S4" represents the object side surface of the second lens, "S5" represents the image side surface of the second lens, and so on; "S13" represents the object side surface of the flat filter, and "S14" represents the image side surface of the flat filter; the radius of curvature represents the degree of curvature of the lens surface, a negative value represents that the surface is bent toward the image side, and a positive value represents that the surface is bent toward the object side, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, and the refractive index represents the ability of the material between the current surface and the next surface to deflect light; the dispersion coefficient represents the dispersion characteristics of the material between the current surface and the next surface to light.

[0089] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. A wide-angle lens structure, characterized in that: It comprises an optical imaging lens group and a system aperture, wherein the optical imaging lens group is sequentially arranged along the optical axis from the object side to the image side with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter; the system aperture is located between the third lens and the fourth lens; The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the sixth lens has positive optical power; The total lens length of the wide-angle lens structure is TTL≤17mm; The optical power of the first to sixth lenses meets the following conditions: -0.31≤φ1 / φ≤0.03; -0.63≤φ2 / φ≤-0.30; 0.20≤φ3 / φ≤0.57; -0.38≤φ4 / φ≤-0.04; 0.07≤φ5 / φ≤0.30; 0.00≤φ6 / φ≤0.3; Among them, φ1, φ2, φ3, φ4, φ5, and φ6 are the optical powers of the first lens to the sixth lens respectively, and φ is the optical power of the entire optical system.

2. A wide-angle lens structure according to claim 1, characterized in that: The first lens is a convex-concave glass spherical lens, the second lens is a convex-concave or biconcave plastic aspherical lens, the third lens is a biconvex glass spherical lens, the fourth lens is a convex-concave plastic aspherical lens, the fifth lens is a concave-convex or biconcave plastic aspherical lens, and the sixth lens is a convex-concave or biconvex plastic aspherical lens.

3. The wide-angle lens structure according to claim 1, characterized in that: The fourth lens and the fifth lens are cemented lenses.

4. The wide-angle lens structure according to claim 1, characterized in that: The refractive indexes of the first to sixth lenses satisfy the following conditions: 1.80≤n1≤2.00； 1.44≤n2≤1.64； 1.82≤n3≤2.06； 1.54≤n4≤1.74； 1.44≤n5≤1.64； 1.44≤n6≤1.64； Among them, n1, n2, n3, n4, n5, and n6 represent the refractive indices of the first lens to the sixth lens in sequence.

5. The wide-angle lens structure according to claim 1, characterized in that: The Abbe constants of the first to sixth lenses satisfy the following conditions: 25.2≤v1≤50.7； 45.1≤v2≤65.1； 16.5≤v3≤21.9； 21.2≤v4≤22.5； 45.9≤v5≤65.9； 45.9≤v6≤65.9； Among them, v1, v2, v3, v4, v5, and v6 represent the dispersion coefficients of the first lens to the sixth lens respectively.

6. The wide-angle lens structure according to claim 1, characterized in that: The image plane diameter IC of the wide-angle lens structure and the lens focal length f of the wide-angle lens structure satisfy the following condition: 0.23≤f / IC≤0.

44.

7. The wide-angle lens structure according to claim 1, characterized in that: The back focus BFL of the wide-angle lens structure and the total length TTL of the wide-angle lens structure satisfy the following condition: BFL / TTL≥0.

14.

8. The wide-angle lens structure according to claim 1, characterized in that: The aperture number F of the wide-angle lens structure satisfies the following condition: 1.90≤F≤2.20.

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