A type of miniature lens with a large target surface and large aperture

Abstract

This invention discloses a large-aperture microlens, comprising, from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power. The large-aperture microlens also includes an aperture stop located between the second and third lenses, or between the third and fourth lenses. By rationally setting the ratio of key parameters, while ensuring a large aperture of at least F1.05 and a large aperture of 6.5mm IH, the total optical length is kept within 30mm, achieving the effect of a microlens.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology, specifically relating to a large-aperture micro-lens with a large target area. Background Technology

[0002] With the widespread development of the security industry both domestically and internationally, conventional apertures and target surfaces can no longer meet the requirements for collecting relevant characteristic data of target objects. Only by having a higher data collection volume and a more accurate data collection mode can information support be provided for subsequent intelligent processing methods such as analysis and automated control.

[0003] As security lenses continue to evolve, they have progressed from standard definition to high definition, from small light throughput to large apertures, and from small target surfaces to large target surfaces. This has resulted in a continuous increase in the number of lenses and their overall size. For example, the total optical length of existing security lenses is typically around 60mm, and they still suffer from limitations in supporting different types or degrees of small target surfaces and small apertures. Therefore, this paper proposes a miniature lens with a large target surface and large aperture. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by proposing a large-aperture microlens that achieves the effect of a microlens while ensuring a large aperture of at least F1.05 and a large aperture of IH 6.5mm.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The present invention proposes a large-aperture microlens, comprising, from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power. The large-aperture microlens also includes an aperture stop, which is located between the second and third lenses, or between the third and fourth lenses.

[0007] Large-aperture microlenses also meet the following conditions:

[0008] 0.73 <SL / TTL<0.85,0.165<Bfl / TTL<0.205,IH / TTL≥0.22;

[0009] Where SL is the distance from the aperture stop to the image plane, Bfl is the optical back focal length, IH is the target surface size, and TTL is the total optical length, all in mm.

[0010] Preferably, the large-aperture miniature lens also meets the following conditions:

[0011] 0.02<|f1 / f2|<0.06, 2.509<|f4 / f5|<3, 1.401<|f6 / f7|<1.8, 6.9≤f≤7.7;

[0012] Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f is the focal length of the large-aperture miniature lens, in mm.

[0013] Preferably, the large-aperture miniature lens also meets the following conditions:

[0014] f1=-13.8732±5%, f2=350.6143±5%, f3=34.3781±5%,

[0015] f4=-23.3214±5%, f5=7.954±20%, f6=-19.8921±5%,

[0016] f7=11.5423±20%, f8=-18.56±5%, f9=14.329±5%;

[0017] Where f1~f9 are the focal lengths of the first lens to the ninth lens, respectively, in mm; "-" indicates the negative direction.

[0018] Preferably, the large-aperture miniature lens also meets the following conditions:

[0019] R 11 = 8.4139±5%, R 12 =3.645±5%, R 21 =-3.912±5%, R 22 =-4.3905±5%,

[0020] R 31 =8.9262±5%, R 32 =14.184±5%, R 41 =12.846±5%, R 42 =-7.514±5%,

[0021] R 51 =-7.514±5%, R 52 =-19.725±5%, R 61 =-42.9562±5%, R 62 =16.832±5%,

[0022] R 71 =10.932±5%, R 72 =-21.725±5%, R 81 =-4.0956±5%, R 82 =-4.882±5%,

[0023] R 91 =5.22±5%, R 92 =10.965±5%;

[0024] Among them, R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 The radii of curvature R of the object-side mirror surfaces of the first to ninth lenses are, respectively. 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The values ​​are the radii of curvature of the image-side mirrors of the first to ninth lenses, in mm; "-" indicates the negative direction.

[0025] Preferably, the large-aperture miniature lens also meets the following conditions:

[0026] R 11 =30.758±5%, R 12 =6.257±5%, R 21 =-4.681±5%, R 22 =-8.957±5%,

[0027] R 31 =35.048±5%, R 32 =-16.61±5%, R 41 =11.676±5%, R 42 =73.23±5%,

[0028] R 51 =30.083±5%, R 52 =-11.442±5%, R 61 =-11.442±5%, R 62 =5.101±5%,

[0029] R 71=5.101±5%, R 72 =-204.061±5%, R 81 =-6.81±5%, R 82 =-6.945±5%,

[0030] R 91 =11.011±5%, R 92 =22.301±5%;

[0031] Among them, R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 The radii of curvature R of the object-side mirror surfaces of the first to ninth lenses are, respectively. 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The values ​​are the radii of curvature of the image-side mirrors of the first to ninth lenses, in mm; "-" indicates the negative direction.

[0032] Preferably, the first lens is a plastic aspherical lens or a plastic spherical lens; the second lens is a plastic aspherical lens; the third lens is a plastic aspherical lens or a plastic spherical lens; the fourth lens is a convex-concave glass spherical lens; the fifth lens is a biconvex glass spherical lens; the sixth lens is a plastic aspherical lens or a plastic spherical lens; the seventh lens is a plastic aspherical lens or a plastic spherical lens; the eighth lens is a plastic aspherical lens; and the ninth lens is a plastic aspherical lens, and the surface shape of the aspherical lens satisfies the following expression:

[0033] ;

[0034] In the formula, Z is the sagitta, c is the curvature, y is the radial coordinate, k is the conic coefficient, and A i These are the coefficients of higher-order terms.

[0035] Preferably, the large-aperture miniature lens also meets the following conditions:

[0036] TTL≤30, FOV≥114°, Fno≤1.05, IH≥6.5;

[0037] Where TTL is the total optical length in mm, FOV is the field of view of a large-aperture microlens, Fno is the F-number, and IH is the target size in mm.

[0038] Preferably, the large-aperture miniature lens also meets the following conditions:

[0039] 12.5°≤φ≤16°;

[0040] Where φ is the incident angle of the principal ray at the image plane of a large-aperture microlens.

[0041] Preferably, the large-aperture miniature lens also meets the following conditions:

[0042] SD1≤Φ13.5, SD19≤Φ12.7;

[0043] Wherein, SD1 is the aperture of the first lens and SD19 is the aperture of the ninth lens, in mm.

[0044] Preferably, the operating wavelength of the large-aperture microlens is 435nm~656nm, and the main wavelength is 546nm.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] 1) By rationally allocating positive and negative optical power and the ratio of key parameters, the overall optical length of the lens is greatly reduced, such as to less than or equal to 30mm. This provides more design space and can greatly compress the lens size when combined with the optical engine structure. This greatly advances the miniaturization, portability and weight reduction of this type of product, and can achieve an aperture of at least F1.05 and a lens surface of at least IH6.5mm, resulting in a large lens surface and large aperture effect.

[0047] 2) It is convenient to adjust the overall light trend by reasonably configuring the plastic glass material, control the diameter of the head and tail, and help to control the machinability of the lens while keeping the large target surface unchanged. It also ensures that the overall lens volume is reduced in sync with the trend of overall shortening, and ensures the coordination between the optical engine and the lens. Furthermore, by reasonably configuring the curvature radius of the image side of the sixth lens, the incident angle of the principal ray is kept within a reasonable range.

[0048] 3) Both the front and rear groups adopt a positive and negative combination, which adjusts the light path and allows the use of plastic materials to achieve structural compactness, reduce tolerance sensitivity, and reduce costs. This ensures that the rear light group has a small aperture in the case of a large target surface, and the plastic aspherical surface bears the main optical power to reduce costs, facilitates assembly at both ends, reduces manufacturing difficulty, and improves yield. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the large-target-area, large-aperture micro-lens of the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of embodiment 2 of the large target surface and large aperture micro lens of the present invention.

[0051] Explanation of reference numerals in the attached diagram: L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, eighth lens; L9, ninth lens; STO, aperture stop. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. 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.

[0053] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may be an intervening component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application.

[0054] A large-aperture microlens includes, from the object side to the image side, a first lens L1 with negative optical power, a second lens L2 with positive optical power, a third lens L3 with positive optical power, a fourth lens L4 with negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, and a ninth lens L9 with positive optical power. The large-aperture microlens also includes an aperture stop STO, which is located between the second lens L2 and the third lens L3, or between the third lens L3 and the fourth lens L4.

[0055] Large-aperture microlenses also meet the following conditions:

[0056] 0.73 <SL / TTL<0.85,0.165<Bfl / TTL<0.205,IH / TTL≥0.22;

[0057] Where SL is the distance from the aperture stop STO to the image plane, Bfl is the optical back focal length, IH is the target surface size, and TTL is the total optical length, all in mm.

[0058] The ratio of the target surface size to the total optical length is greater than 0.22, ensuring a reduction in the total optical length while maintaining a large target surface. This lens significantly reduces the total optical length to 30mm or less through a reasonable allocation of positive and negative optical power and key parameter ratios, providing greater design flexibility. This allows for substantial compression of the lens size when combined with the optical-mechanical structure, resulting in significant advancements in miniaturization, portability, and weight reduction for this type of product. Furthermore, it achieves an aperture of at least F1.05 and a target surface size of at least IH 6.5mm, resulting in a large target surface and large aperture effect.

[0059] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0060] 0.02<|f1 / f2|<0.06, 2.509<|f4 / f5|<3, 1.401<|f6 / f7|<1.8, 6.9≤f≤7.7;

[0061] Where f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, f6 is the focal length of the sixth lens L6, f7 is the focal length of the seventh lens L7, and f is the focal length of the large-aperture miniature lens, in mm.

[0062] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0063] f1=-13.8732±5%, f2=350.6143±5%, f3=34.3781±5%,

[0064] f4=-23.3214±5%, f5=7.954±20%, f6=-19.8921±5%,

[0065] f7=11.5423±20%, f8=-18.56±5%, f9=14.329±5%;

[0066] Where f1~f9 are the focal lengths of the first lens L1 to the ninth lens L9, respectively, in mm; "-" indicates the negative direction.

[0067] By rationally allocating optical power, the overall optical length of the lens is greatly reduced, which greatly compresses the lens size and achieves a large target surface and large aperture effect. This can effectively reduce the height of light while ensuring high resolution.

[0068] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0069] R 11 =8.4139±5%, R 12=3.645±5%, R 21 =-3.912±5%, R 22 =-4.3905±5%,

[0070] R 31 =8.9262±5%, R 32 =14.184±5%, R 41 =12.846±5%, R 42 =-7.514±5%,

[0071] R 51 =-7.514±5%, R 52 =-19.725±5%, R 61 =-42.9562±5%, R 62 =16.832±5%,

[0072] R 71 =10.932±5%, R 72 =-21.725±5%, R 81 =-4.0956±5%, R 82 =-4.882±5%,

[0073] R 91 =5.22±5%, R 92 =10.965±5%;

[0074] Among them, R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 The radii of curvature R of the object-side mirror surfaces of lenses L1 through L9 are, respectively. 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The radii of curvature of the image-side mirrors of lenses L1 through L9 are in mm, respectively; "-" indicates the negative direction.

[0075] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0076] nd1 nd2 nd3 nd4 nd5 nd6 nd7 nd8 nd9 1.54±5% 1.54±5% 1.66±5% 1.85±5% 1.67±5% 1.67±5% 1.51±5% 1.67±5% 1.54±5% vd1 vd2 vd3 vd4 vd5 vd6 vd7 vd8 vd9 55.7±5% 56±5% 20.4±5% 23.8±5% 54.35±5% 24.6±5% 58.2±5% 21±5% 56±5%

[0077] Wherein, nd1~nd9 are the refractive indices of the first lens L1 to the ninth lens L9, respectively, and vd1~vd9 are the Abbe numbers of the first lens L1 to the ninth lens L9, respectively. This allows for the adjustment of the overall light path by reasonably configuring the refractive index and Abbe number, thereby improving image quality.

[0078] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0079] R 11 =30.758±5%, R 12 =6.257±5%, R 21 =-4.681±5%, R 22 =-8.957±5%,

[0080] R 31 =35.048±5%, R 32 =-16.61±5%, R 41 =11.676±5%, R 42 =73.23±5%,

[0081] R 51 =30.083±5%, R 52 =-11.442±5%, R 61 =-11.442±5%, R 62 =5.101±5%,

[0082] R 71 =5.101±5%, R 72 =-204.061±5%, R 81 =-6.81±5%, R 82 =-6.945±5%,

[0083] R 91 =11.011±5%, R 92 =22.301±5%;

[0084] Among them, R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 The radii of curvature R of the object-side mirror surfaces of lenses L1 through L9 are, respectively. 12 R 22 R 32 R 42 R 52 R 62R 72 R 82 R 92 The radii of curvature of the image-side mirrors of lenses L1 through L9 are in mm, respectively; "-" indicates the negative direction.

[0085] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0086] nd1 nd2 nd3 nd4 nd5 nd6 nd7 nd8 nd9 1.54±5% 1.71±5% 1.86±5% 1.88±5% 1.65±5% 1.73±5% 1.57±5% 1.67±5% 1.62±5% vd1 vd2 vd3 vd4 vd5 vd6 vd7 vd8 vd9 75±5% 35±5% 40±5% 40.2±5% 54.35±5% 27.6±5% 68±5% 53±5% 43±5%

[0087] Wherein, nd1~nd9 are the refractive indices of the first lens L1 to the ninth lens L9, respectively, and vd1~vd9 are the Abbe numbers of the first lens L1 to the ninth lens L9, respectively. This allows for the adjustment of the overall light path by reasonably configuring the refractive index and Abbe number, thereby improving image quality.

[0088] In one embodiment, the first lens L1 is a plastic aspherical lens or a plastic spherical lens; the second lens L2 is a plastic aspherical lens; the third lens L3 is a plastic aspherical lens or a plastic spherical lens; the fourth lens L4 is a convex-concave glass spherical lens; the fifth lens L5 is a biconvex glass spherical lens; the sixth lens L6 is a plastic aspherical lens or a plastic spherical lens; the seventh lens L7 is a plastic aspherical lens or a plastic spherical lens; the eighth lens L8 is a plastic aspherical lens; and the ninth lens L9 is a plastic aspherical lens, and the surface shape of the aspherical lens satisfies the following expression:

[0089] ;

[0090] In the formula, Z is the sagitta, c is the curvature, y is the radial coordinate, k is the conic coefficient, and A i These are the coefficients of higher-order terms.

[0091] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0092] TTL≤30, FOV≥114°, Fno≤1.05, IH≥6.5;

[0093] Where TTL is the total optical length in mm, FOV is the field of view of a large-aperture microlens, Fno is the F-number, and IH is the target size in mm.

[0094] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0095] 12.5°≤φ≤16°;

[0096] Where φ is the angle of incidence of the principal ray at the image plane of a large-aperture microlens. While reducing the overall length, the angle of incidence of the principal ray does not increase significantly, thus avoiding chromatic aberration in the lens.

[0097] In one embodiment, the large-aperture microlens also satisfies the following conditions:

[0098] SD1≤Φ13.5, SD19≤Φ12.7;

[0099] Wherein, SD1 is the aperture of the first lens L1, and SD19 is the aperture of the ninth lens L9, in mm. This design helps to maintain a compact size while ensuring the compatibility of the lens head and rear interface dimensions.

[0100] In one embodiment, the large-aperture microlens operates in the wavelength range of 435nm to 656nm, with a main wavelength of 546nm.

[0101] For ease of understanding, the following detailed explanation is provided through specific embodiments.

[0102] Example 1:

[0103] like Figure 1 As shown, a large-aperture miniature lens with a large target area consists of nine lenses, including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 arranged sequentially from the object side to the image side. An aperture stop STO is also provided between the second lens L2 and the third lens L3.

[0104] The first lens L1 is a plastic aspherical lens with negative optical power;

[0105] The second lens L2 is a plastic aspherical lens with positive optical power;

[0106] The third lens L3 is a plastic aspherical lens with positive optical power;

[0107] The fourth lens, L4, is a convex-concave glass spherical lens with negative optical power;

[0108] The fifth lens, L5, is a biconvex glass spherical lens with positive optical power;

[0109] The sixth lens, L6, is a plastic aspherical lens with negative optical power;

[0110] The seventh lens, L7, is a plastic aspherical lens with positive optical power;

[0111] The eighth lens, L8, is a plastic aspherical lens with negative optical power;

[0112] The ninth lens, L9, is a plastic aspherical lens with positive optical power;

[0113] And satisfy the following conditions:

[0114] <![CDATA[f1=-13.8732]]> <![CDATA[R 11 = 8.4139]]> <![CDATA[R 12 =3.645]]> <![CDATA[f2=350.6143]]> <![CDATA[R 21 =-3.912]]> <![CDATA[R 22 =-4.3905]]> <![CDATA[f3=34.3781]]> <![CDATA[R 31 =8.9262]]> <![CDATA[R 32 =14.184]]> <![CDATA[f4=-23.3214]]> <![CDATA[R 41 =12.846]]> <![CDATA[R 42 =-7.514]]> <![CDATA[f5=8.805]]> <![CDATA[R 51 =-7.514]]> <![CDATA[R 52 =-19.725]]> <![CDATA[f6=-19.8921]]> <![CDATA[R 61 =-42.9562]]> <![CDATA[R 62 =16.832]]> <![CDATA[f7=13.2614]]> <![CDATA[R 71 =10.932]]> <![CDATA[R 72 =-21.725]]> <![CDATA[f8=-18.56]]> <![CDATA[R 81 =-4.0956]]> <![CDATA[R 82 =-4.882]]> <![CDATA[f9=14.329]]> <![CDATA[R 91 =5.22]]> <![CDATA[R 92 =10.965]]>

[0115] Where f1~f9 are the focal lengths of the first lens L1 to the ninth lens L9, respectively, in mm; R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 The radii of curvature of the object-side mirror surfaces of lenses L1 through L9, in mm, are as follows: R 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The figures show the radii of curvature of the image-side mirrors of lenses L1 through L9, in mm; "-" indicates a negative direction. In the figure, IR represents the filter and IMA represents the image plane.

[0116] In this embodiment, the aspherical equations of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 all satisfy the following expression:

[0117]

[0118] In the formula, Z is the sagitta, c is the curvature, y is the radial coordinate, k is the conic coefficient, and A i These are the coefficients of higher-order terms.

[0119] In this embodiment, the aspherical coefficients of the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are as follows:

[0120] k <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[A8]]> L1S1 -2.912123 -2.86E-03 1.31E-04 -4.52E-06 1.17E-07 -2.05E-09 2.15E-11 -9.93E-14 L1S2 -0.541693 -3.89E-03 1.68E-04 -6.28E-06 7.97E-08 4.87E-09 -2.66E-10 3.06E-12 L2S1 -3.197656 -1.37E-03 1.95E-05 3.22E-06 -2.92E-07 1.28E-08 -3.04E-10 3.13E-12 L2S2 -3.2156 -9.28E-04 4.96E-05 -3.79E-07 -3.99E-08 2.64E-09 -8.42E-11 9.97E-13 L3S1 -0.2790 -1.69E-03 9.16E-05 -4.89E-06 1.23E-07 -2.67E-09 3.51E-11 -2.96E-13 L3S2 -49.4981 -1.10E-03 6.71E-05 -3.00E-06 1.08E-07 -2.68E-09 3.86E-11 -2.25E-13 L6S1 57.6702 7.18E-04 -3.59E-05 2.86E-06 -2.52E-07 1.21E-08 -2.90E-10 2.79E-12 L6S2 0.7652 7.13E-04 1.34E-04 -2.08E-05 1.58E-06 -7.68E-07 2.11E-09 -2.39E-11 L7S1 -1.5231 -8.47E-04 2.43E-04 -3.18E-05 2.55E-06 -1.32E-07 3.72E-09 -4.19E-11 L7S2 15.2319 -9.93E-04 6.35E-05 1.13E-06 -1.66E-06 8.87E-08 -2.21E-09 2.20E-11 L8S1 -5.4231 -7.54E-04 3.27E-04 -2.81E-05 1.55E-06 -5.39E-08 1.432E-09 -9.67E-12 L8S2 -10.211 -2.19E-03 5.58E-04 -5.24E-05 3.14E-06 -1.02E-07 1.58E-09 -8.76E-12 L9S1 -6.85310 -1.33E-03 1.968E-04 -1.33E-05 7.49E-07 -5.41E-08 4.17E-10 -3.04E-12 L9S2 -7.265 -1.72E-03 1.27E-03 -1.01E-05 5.12E-07 -3.56E-08 2.62E-10 -1.86E-12

[0121] Among them, L1S1, L2S1, L3S1, L6S1, L7S1, L8S1, and L9S1 are the object-side mirrors of the first lens L1 to the ninth lens L9, respectively, and L1S2, L2S2, L3S2, L6S2, L7S2, L8S2, and L9S2 are the image-side mirrors of the first lens L1 to the ninth lens L9, respectively.

[0122] In this embodiment, the large-area, large-aperture microlens also meets the following conditions:

[0123] nd1 nd2 nd3 nd4 nd5 nd6 nd7 nd8 nd9 1.54 1.54 1.66 1.85 1.67 1.67 1.51 1.67 1.54 vd1 vd2 vd3 vd4 vd5 vd6 vd7 vd8 vd9 55.7 56 20.4 23.8 54.35 24.6 58.2 21 56

[0124] Wherein, nd1~nd9 are the refractive indices of the first lens L1 to the ninth lens L9, respectively, and vd1~vd9 are the Abbe numbers of the first lens L1 to the ninth lens L9, respectively.

[0125] Based on the above data, the large-aperture miniature lens of this embodiment meets the following requirements: TTL=29.8mm; SL / TTL=0.786; Bfl / TTL=0.168; φ=14.8°; SD1=Φ13.4mm; SD19=Φ12.7mm; FOV=114.2°; |f1 / f2|=0.04; |f4 / f5|=2.65; |f6 / f7|=1.5; f=7.2mm; IH / TTL=0.23; IH=6.52mm; Fno=1.05; operating wavelength range is 435nm~656nm, with a dominant wavelength of 546nm. It can achieve the requirements of a large target area, large aperture, and miniaturization.

[0126] Example 2:

[0127] like Figure 2 As shown, a large-aperture miniature lens consists of nine lenses, including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9 arranged sequentially from the object side to the image side. An aperture stop STO is also provided between the third lens L3 and the fourth lens L4.

[0128] The first lens L1 is a plastic spherical lens with negative optical power;

[0129] The second lens L2 is a plastic aspherical lens with positive optical power;

[0130] The third lens L3 is a plastic spherical lens with positive optical power;

[0131] The fourth lens, L4, is a convex-concave glass spherical lens with negative optical power;

[0132] The fifth lens, L5, is a biconvex glass spherical lens with positive optical power;

[0133] The sixth lens, L6, is a plastic spherical lens with negative optical power;

[0134] The seventh lens, L7, is a plastic spherical lens with positive optical power;

[0135] The eighth lens, L8, is a plastic aspherical lens with negative optical power;

[0136] The ninth lens, L9, is a plastic aspherical lens with positive optical power;

[0137] And satisfy the following conditions:

[0138] <![CDATA[f1=-13.8732]]> <![CDATA[R 11= 30.758]]> <![CDATA[R 12 =6.257]]> <![CDATA[f2=350.6143]]> <![CDATA[R 21 =-4.681]]> <![CDATA[R 22 =-8.957]]> <![CDATA[f3=34.3781]]> <![CDATA[R 31 =35.048]]> <![CDATA[R 32 =-16.61]]> <![CDATA[f4=-23.3214]]> <![CDATA[R 41 =11.676]]> <![CDATA[R 42 =73.23 <!-- 7 -->]]> <![CDATA[f5=7.954]]> <![CDATA[R 51 =30.083]]> <![CDATA[R 52 =-11.442]]> <![CDATA[f6=-19.8921]]> <![CDATA[R 61 =-11.442]]> <![CDATA[R 62 =5.101]]> <![CDATA[f7=11.5423]]> <![CDATA[R 71 =5.101]]> <![CDATA[R 72 =-204.061]]> <![CDATA[f8=-18.56]]> <![CDATA[R 81 =-6.81]]> <![CDATA[R 82 =-6.945]]> <![CDATA[f9=14.329]]> <![CDATA[R 91 =11.011]]> <![CDATA[R 92 =22.301]]>

[0139] Where f1~f9 are the focal lengths of the first lens L1 to the ninth lens L9, respectively, in mm; R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 The radii of curvature of the object-side mirror surfaces of lenses L1 through L9, in mm, are as follows: R 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The figures show the radii of curvature of the image-side mirrors of lenses L1 through L9, in mm; "-" indicates a negative direction. In the figure, IR represents the filter and IMA represents the image plane.

[0140] In this embodiment, the aspherical equations of the second lens L2, the eighth lens L8, and the ninth lens L9 all satisfy the following expression:

[0141]

[0142] In the formula, Z is the sagitta, c is the curvature, y is the radial coordinate, k is the conic coefficient, and A i These are the coefficients of higher-order terms.

[0143] In this embodiment, the aspherical coefficients of the second lens L2, the eighth lens L8, and the ninth lens L9 are as follows:

[0144] k <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[A8]]> L2S1 -3.6124 2.22-03 -5.750E-05 1.025E-06 1.17E-07 / / / L2S2 21.247 1.60E-03 -3.646E-05 5.634E-07 7.97E-08 / / / L8S1 -30.197656 3.940E-03 -4.089E-05 -9.12E-07 1.565E-08 / / / L8S2 -3.2156 3.343E-03 80.632E-05 -30.6E-06 9.28E-08 / / / L9S1 0.2790 2. 74E-04 -1.6797E-06 -2.79E-08 -43.9E-09 -5.9E-011 / / L9S2 9.4981 -1. 62E-03 63.517E-05 -2.17E-06 4.44E-008 -35.1E-010 / /

[0145] Among them, L2S1, L8S1, and L9S1 are the object-side mirrors of the second lens L2, the eighth lens L8, and the ninth lens L9, respectively, and L2S2, L8S2, and L9S2 are the image-side mirrors of the second lens L2, the eighth lens L8, and the ninth lens L9, respectively.

[0146] In this embodiment, the large-area, large-aperture microlens also meets the following conditions:

[0147] nd1 nd2 nd3 nd4 nd5 nd6 nd7 nd8 nd9 1.54 1.71 1.86 1.88 1.65 1.73 1.57 1.67 1.62 vd1 vd2 vd3 vd4 vd5 vd6 vd7 vd8 vd9 75 35 40 40.2 54.35 27.6 68 53 43

[0148] Wherein, nd1~nd9 are the refractive indices of the first lens L1 to the ninth lens L9, respectively, and vd1~vd9 are the Abbe numbers of the first lens L1 to the ninth lens L9, respectively.

[0149] Based on the above data, the large-aperture miniature lens of this embodiment meets the following requirements: TTL=29.83mm; SL / TTL=0.79; Bfl / TTL=0.1746; φ=14.3°; SD1=Φ13.5mm; SD19=Φ12.7mm; FOV=119.6°; |f1 / f2|=0.04; |f4 / f5|=2.93; |f6 / f7|=1.72; f=6.98mm; IH / TTL=0.242; IH=6.53mm; Fno=1.04; operating wavelength is 435nm~656nm, and the main wavelength is 546nm. It can achieve the requirements of large target area, large aperture, and miniaturization.

[0150] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0151] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A large-aperture, large-target miniature lens, characterized in that: The large-aperture microlens includes, from the object side to the image side, a first lens (L1) with negative optical power, a second lens (L2) with positive optical power, a third lens (L3) with positive optical power, a fourth lens (L4) with negative optical power, a fifth lens (L5) with positive optical power, a sixth lens (L6) with negative optical power, a seventh lens (L7) with positive optical power, an eighth lens (L8) with negative optical power, and a ninth lens (L9) with positive optical power. The large-aperture microlens also includes an aperture stop (STO), which is located between the second lens (L2) and the third lens (L3), or between the third lens (L3) and the fourth lens (L4). The large-aperture, large-target-area miniature lens also meets the following conditions: 0.73 <SL / TTL<0.85,0.165<Bfl / TTL<0.205,IH / TTL≥0.22,0.02<|f1 / f2|<0.06; Wherein, SL is the distance from the aperture stop (STO) to the image plane, Bfl is the optical back focal length, IH is the target surface size, TTL is the total optical length, f1 is the focal length of the first lens (L1), and f2 is the focal length of the second lens (L2), all in mm.

2. The large-aperture microlens as described in claim 1, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: 2.509<|f4 / f5|<3, 1.401<|f6 / f7|<1.8, 6.9≤f≤7.7; Wherein, f4 is the focal length of the fourth lens (L4), f5 is the focal length of the fifth lens (L5), f6 is the focal length of the sixth lens (L6), f7 is the focal length of the seventh lens (L7), and f is the focal length of the large-aperture microlens, in mm.

3. The large-aperture microlens as described in claim 1, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: f1=-13.8732±5%, f2=350.6143±5%, f3=34.3781±5%, f4=-23.3214±5%, f5=7.954±20%, f6=-19.8921±5%, f7=11.5423±20%, f8=-18.56±5%, f9=14.329±5%; Where f1 to f9 are the focal lengths of the first lens (L1) to the ninth lens (L9) respectively, in mm; "-" indicates the negative direction.

4. The large-aperture, large-target-area miniature lens as described in claim 3, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: R 11 = 8.4139±5%,R 12 =3.645±5%,R 21 =-3.912±5%,R 22 =-4.3905±5%, R 31 =8.9262±5%,R 32 =14.184±5%,R 41 =12.846±5%,R 42 =-7.514±5%, R 51 =-7.514±5%,R 52 =-19.725±5%,R 61 =-42.9562±5%,R 62 =16.832±5%, R 71 =10.932±5%,R 72 =-21.725±5%,R 81 =-4.0956±5%,R 82 =-4.882±5%, R 91 =5.22±5%,R 92 =10.965±5%; Among them, R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 R represents the radius of curvature of the object-side mirror surfaces of the first lens (L1) to the ninth lens (L9), respectively. 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The curvature radii of the image-side mirrors of the first lens (L1) to the ninth lens (L9) are in mm, respectively; "-" indicates the negative direction.

5. The large-aperture, large-target-area miniature lens as described in claim 3, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: R 11 =30.758±5%,R 12 =6.257±5%,R 21 =-4.681±5%,R 22 =-8.957±5%, R 31 =35.048±5%,R 32 =-16.61±5%,R 41 =11.676±5%,R 42 =73.23±5%, R 51 =30.083±5%,R 52 =-11.442±5%,R 61 =-11.442±5%,R 62 =5.101±5%, R 71 =5.101±5%,R 72 =-204.061±5%,R 81 =-6.81±5%,R 82 =-6.945±5%, R 91 =11.011±5%,R 92 =22.301±5%; Among them, R 11 R 21 R 31 R 41 R 51 R 61 R 71 R 81 R 91 R represents the radius of curvature of the object-side mirror surfaces of the first lens (L1) to the ninth lens (L9), respectively. 12 R 22 R 32 R 42 R 52 R 62 R 72 R 82 R 92 The curvature radii of the image-side mirrors of the first lens (L1) to the ninth lens (L9) are in mm, respectively; "-" indicates the negative direction.

6. The large-aperture, large-target-area miniature lens as described in claim 1, characterized in that: The first lens (L1) is a plastic aspherical lens or a plastic spherical lens; the second lens (L2) is a plastic aspherical lens; the third lens (L3) is a plastic aspherical lens or a plastic spherical lens; the fourth lens (L4) is a convex-concave glass spherical lens; the fifth lens (L5) is a biconvex glass spherical lens; the sixth lens (L6) is a plastic aspherical lens or a plastic spherical lens; the seventh lens (L7) is a plastic aspherical lens or a plastic spherical lens; the eighth lens (L8) is a plastic aspherical lens; and the ninth lens (L9) is a plastic aspherical lens, and the surface shape of the aspherical lens satisfies the following expression: ； In the formula, Z is the sagitta, c is the curvature, y is the radial coordinate, k is the conic coefficient, and A i These are the coefficients of higher-order terms.

7. The large-aperture, large-target-area miniature lens as described in claim 1, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: TTL≤30, FOV≥114°, Fno≤1.05, IH≥6.5; Where TTL is the total optical length in mm, FOV is the field of view of the large-aperture microlens with a large target surface, Fno is the F-number, and IH is the target surface size in mm.

8. The large-aperture microlens as described in claim 1, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: 12.5°≤φ≤16°; Wherein, φ is the incident angle of the principal ray at the image plane of the large-target-area, large-aperture microlens.

9. The large-aperture microlens as described in claim 1, characterized in that: The large-aperture, large-target-area miniature lens also meets the following conditions: SD1≤Φ13.5, SD19≤Φ12.7; Wherein, SD1 is the aperture of the first lens (L1), and SD19 is the aperture of the ninth lens (L9), in mm.

10. The large-aperture microlens as described in claim 1, characterized in that: The large-aperture microlens operates in the wavelength range of 435nm to 656nm, with a main wavelength of 546nm.

Images