Large-target-surface large-aperture miniature lens

Abstract

The invention discloses a miniature lens with a large target surface and a large aperture. Comprising a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power which are sequentially arranged from an object side to an image side, the large-target-surface large-aperture miniature lens comprises a second lens with positive focal power, a third lens with negative focal power, an eighth lens with negative focal power and a ninth lens with positive focal power, and further comprises an aperture diaphragm which is located between the second lens and the third lens or located between the third lens and the fourth lens. And by reasonably setting the proportional relation of key parameters, the total optical length is within 30mm under the condition of ensuring a large aperture of at least F1.05 and a large target surface of IH6.5 mm, and the effect of a miniature lens is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a micro lens with a large target surface and a large aperture. Background Art

[0002] With the popularization and development of the security field at home and abroad, conventional apertures and target surfaces can no longer meet the requirements for information collection of relevant characteristic data of target objects. Only with higher data collection volume and more accurate data collection mode can information support be provided for subsequent analysis, automatic control and other intelligent processing methods.

[0003] With the continuous development of security lenses, lenses have changed from standard definition to high definition, from small light flux to large aperture, and from small target surface with small data points to large target surface, resulting in an increasing number of lenses and increasing size. For example, the total optical length of existing security lenses is usually around 60mm, and there are still different types or degrees of defects such as small target surface and small aperture. In view of this, a large target surface and large aperture micro lens is proposed. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems and to propose a large-target-area, large-aperture micro-lens, which, while ensuring a large aperture of at least F1.05 and a large target surface of IH6.5mm, keeps the total optical length within 30mm and achieves the effect of a micro-lens.

[0005] To achieve the above object, the technical solution adopted by the present invention is: The present invention provides a large-target-surface-large-aperture microlens, comprising 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, which are sequentially arranged from the object side to the image side. The large-target-surface-large-aperture microlens further comprises an aperture stop, which is located between the second lens and the third lens, or between the third lens and the fourth lens. The large-image-area, large-aperture micro lens also meets the following conditions: 0.73 <SL / TTL<0.85,0.165<Bfl / TTL<0.205,IH / TTL≥0.22; Wherein, SL is the distance from the aperture stop to the image plane, Bfl is the optical back focus, IH is the target surface size, and TTL is the total optical length, all in mm.

[0006] Preferably, the large-area, large-aperture micro lens also meets the following conditions: 0.02<|f1 / f2|<0.06, 2.509<|f4 / f5|<3, 1.401<|f6 / f7|<1.8, 6.9≤f≤7.7; Among them, 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-target-area, large-aperture micro lens, in mm.

[0007] Preferably, the large-area, large-aperture micro 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%; Among them, f1~f9 are the focal lengths of the first lens to the ninth lens respectively, in mm; “-” indicates the direction is the negative direction.

[0008] Preferably, the large-area, large-aperture micro 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 are the curvature radii of the object side mirror surfaces of the first to ninth lenses, R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image-side mirror surfaces of the first to ninth lenses, in millimeters. “-” indicates that the direction is the negative direction.

[0009] Preferably, the large-area, large-aperture micro 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 , R51 , R 61 , R 71 , R 81 , R 91 are the curvature radii of the object side mirror surfaces of the first to ninth lenses, R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image-side mirror surfaces of the first to ninth lenses, in millimeters. “-” indicates that the direction is the negative direction.

[0010] Preferably, the first lens is a plastic aspheric lens or a plastic spherical lens; the second lens is a plastic aspheric lens; the third lens is a plastic aspheric lens or a plastic spherical lens; the fourth lens is a convex-concave glass spherical lens; the fifth lens is a double-convex glass spherical lens; the sixth lens is a plastic aspheric lens or a plastic spherical lens; the seventh lens is a plastic aspheric lens or a plastic spherical lens; the eighth lens is a plastic aspheric lens; the ninth lens is a plastic aspheric lens, and the surface shape of the aspheric lens satisfies the following expression: ; In the formula, Z is the sagittal height, c is the curvature, y is the radial coordinate, k is the cone coefficient, and A is i are the coefficients of the higher-order terms.

[0011] Preferably, the large-area, large-aperture micro lens also meets the following conditions: TTL≤30, FOV≥114°, Fno≤1.05, IH≥6.5; Among them, TTL is the total optical length, unit is mm, FOV is the field of view of the large-target-area large-aperture micro lens, Fno is the F number, and IH is the target surface size, unit is mm.

[0012] Preferably, the large-area, large-aperture micro lens also meets the following conditions: 12.5°≤φ≤16°; Among them, φ is the incident angle of the main light at the image plane of the large-aperture micro lens with a large target surface.

[0013] Preferably, the large-area, large-aperture micro lens also meets the following conditions: SD1≤Φ13.5, SD19≤Φ12.7; Wherein, SD1 is the aperture of the first lens, and SD19 is the aperture of the ninth lens, both in mm.

[0014] Preferably, the operating wavelength band of the large-target-area large-aperture micro-lens is 435nm~656nm, and the main wavelength is 546nm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1) The lens can significantly reduce the total optical length of the lens by reasonably allocating positive and negative focal lengths and the ratio of key parameters, such as less than or equal to 30mm, which can provide a larger design space. When combined with the optical-mechanical structure, the lens size can be greatly compressed, making great progress in the miniaturization, portability and lightweight of such products. It can also achieve an aperture number of at least F1.05 and a target surface of at least IH6.5mm, achieving a large target surface and large aperture effect; 2) It is convenient to adjust the overall light trend by reasonably configuring the plastic glass material, control the aperture of the head and tail, and help to control the processability of the lens without changing the large target surface, ensure that the total volume of the lens is reduced synchronously under the trend of overall shortening, ensure the coordination of light and machine, and make the incident angle of the main light within a reasonable range by reasonably configuring the curvature radius of the image side mirror of the sixth lens; 3) Both the front and rear groups adopt a positive and negative combination to adjust the light trend, and can use plastic materials to achieve compact structure, reduce tolerance sensitivity, and reduce costs, so as to ensure that the rear optical group has a small aperture in the case of a large target surface. The plastic aspheric surface is responsible for the main optical focal length to reduce costs, facilitate assembly at both ends, reduce manufacturing difficulty and improve yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a large-target-area, large-aperture micro-lens embodiment 1 of the present invention; Figure 2 This is a schematic structural diagram of Example 2 of a large-target-area, large-aperture micro-lens according to the present invention.

[0017] Description of reference numerals: 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 DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of this application. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0020] A large-target-surface-large-aperture microlens, comprising 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, which are sequentially arranged from the object side to the image side. The large-target-surface-large-aperture microlens further comprises an aperture stop STO, and the aperture stop STO 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-image-area, large-aperture micro lens also meets the following conditions: 0.73 <SL / TTL<0.85,0.165<Bfl / TTL<0.205,IH / TTL≥0.22; Wherein, SL is the distance from the aperture stop STO to the image plane, Bfl is the optical back focus, IH is the target surface size, and TTL is the total optical length, all in mm.

[0021] Among them, the ratio of the target surface size to the total optical length is greater than 0.22, ensuring that the total optical length is reduced under the premise of the same large target surface. The lens can greatly reduce the total optical length of the lens by reasonably allocating positive and negative focal lengths and the proportional relationship of key parameters, such as less than or equal to 30mm, which can provide a larger design space. When combined with the optical-mechanical structure, the lens size can be greatly compressed, making great progress in the miniaturization, portability and lightweight of such products, and can achieve an aperture number of at least F1.05 and a target surface of at least IH6.5mm, obtaining a large target surface and a large aperture effect.

[0022] In one embodiment, the large-area, large-aperture micro-lens also satisfies the following conditions: 0.02<|f1 / f2|<0.06, 2.509<|f4 / f5|<3, 1.401<|f6 / f7|<1.8, 6.9≤f≤7.7; Among them, 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-target-area large-aperture micro lens, and the unit is mm.

[0023] In one embodiment, the large-area, large-aperture micro-lens also satisfies 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%; Wherein, f1~f9 are the focal lengths of the first lens L1 to the ninth lens L9 respectively, in mm; “-” indicates that the direction is the negative direction.

[0024] Among them, the overall optical length of the lens is greatly reduced by reasonably distributing the optical focal length, which greatly compresses the lens size and obtains a large target surface and large aperture effect, which can effectively reduce the light height while ensuring high resolution.

[0025] In one embodiment, the large-area, large-aperture micro-lens also satisfies 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 , R41 , R 51 , R 61 , R 71 , R 81 , R 91 are the curvature radii of the object side mirror surfaces of the first lens L1 to the ninth lens L9, R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image-side mirror surfaces of the first lens L1 to the ninth lens L9, in order, with the unit being mm; “-” indicates that the direction is the negative direction.

[0026] In one embodiment, the large-area, large-aperture micro-lens also satisfies the following conditions: 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% Among them, nd1~nd9 are the refractive indices of the first lens L1 to the ninth lens L9, and vd1~vd9 are the Abbe numbers of the first lens L1 to the ninth lens L9, so as to adjust the overall light trend by reasonably configuring the refractive index and the Abbe number to improve the imaging quality.

[0027] In one embodiment, the large-area, large-aperture micro-lens also satisfies 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 are the curvature radii of the object side mirror surfaces of the first lens L1 to the ninth lens L9, R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image-side mirror surfaces of the first lens L1 to the ninth lens L9, in order, with the unit being mm; “-” indicates that the direction is the negative direction.

[0028] In one embodiment, the large-area, large-aperture micro-lens also satisfies the following conditions: 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% Among them, nd1~nd9 are the refractive indices of the first lens L1 to the ninth lens L9, and vd1~vd9 are the Abbe numbers of the first lens L1 to the ninth lens L9, so as to adjust the overall light trend by reasonably configuring the refractive index and the Abbe number to improve the imaging quality.

[0029] In one embodiment, the first lens L1 is a plastic aspheric lens or a plastic spherical lens; the second lens L2 is a plastic aspheric lens; the third lens L3 is a plastic aspheric lens or a plastic spherical lens; the fourth lens L4 is a convex-concave glass spherical lens; the fifth lens L5 is a double-convex glass spherical lens; the sixth lens L6 is a plastic aspheric lens or a plastic spherical lens; the seventh lens L7 is a plastic aspheric lens or a plastic spherical lens; the eighth lens L8 is a plastic aspheric lens; the ninth lens L9 is a plastic aspheric lens, and the surface shape of the aspheric lens satisfies the following expression: ; In the formula, Z is the sagittal height, c is the curvature, y is the radial coordinate, k is the cone coefficient, and A is i are the coefficients of the higher-order terms.

[0030] In one embodiment, the large-area, large-aperture micro-lens also satisfies the following conditions: TTL≤30, FOV≥114°, Fno≤1.05, IH≥6.5; Among them, TTL is the total optical length, unit is mm, FOV is the field of view of the large-target-area large-aperture micro lens, Fno is the F number, and IH is the target surface size, unit is mm.

[0031] In one embodiment, the large-area, large-aperture micro-lens also satisfies the following conditions: 12.5°≤φ≤16°; Where φ is the incident angle of the main ray at the image plane of the large-aperture micro lens with a large target surface. Under the premise of reducing the total length, the incident angle of the main ray does not increase significantly, avoiding lens color cast.

[0032] In one embodiment, the large-area, large-aperture micro-lens also satisfies the following conditions: SD1≤Φ13.5, SD19≤Φ12.7; Among them, SD1 is the diameter of the first lens L1, and SD19 is the diameter of the ninth lens L9, in mm. This is conducive to ensuring a small size while meeting the universality of the lens head diameter and the interface size of the lens tail end.

[0033] In one embodiment, the operating wavelength band of the large-target-area large-aperture micro-lens is 435nm-656nm, and the main wavelength is 546nm.

[0034] For ease of understanding, the invention is described in detail below through specific embodiments.

[0035] Embodiment 1: like Figure 1 As shown, a large-target-area large-aperture micro lens is composed 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, which are arranged in sequence from the object side to the image side, and an aperture stop STO is also arranged between the second lens L2 and the third lens L3, wherein: The first lens L1 is a plastic aspherical lens with negative optical power; The second lens L2 is a plastic aspherical lens with positive refractive power; The third lens L3 is a plastic aspherical lens with positive refractive power; The fourth lens L4 is a convex-concave glass spherical lens with negative optical power; The fifth lens L5 is a biconvex glass spherical lens with positive power; The sixth lens L6 is a plastic aspherical lens with negative optical power; The seventh lens L7 is a plastic aspherical lens with positive refractive power; The eighth lens L8 is a plastic aspherical lens with negative refractive power; The ninth lens L9 is a plastic aspherical lens with positive refractive power; And meet the following conditions: <![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]]> Wherein, f1~f9 are the focal lengths of the first lens L1 to the ninth lens L9, in units of mm; R 11 , R 21 , R 31 , R 41 , R 51 , R 61 , R 71 , R 81 , R 91 R is the curvature radius of the object side mirror surface of the first lens L1 to the ninth lens L9, in mm; 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image side mirror surfaces of the first lens L1 to the ninth lens L9, in units of mm; “-” indicates that the direction is the negative direction. In the figure, IR indicates the filter, and IMA indicates the image surface.

[0036] In this embodiment, the aspheric surface 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: In the formula, Z is the sagittal height, c is the curvature, y is the radial coordinate, k is the cone coefficient, and A is i are the coefficients of the higher-order terms.

[0037] In this embodiment, the aspheric 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: 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 Among them, L1S1, L2S1, L3S1, L6S1, L7S1, L8S1, and L9S1 are respectively the object-side mirror surfaces of the first lens L1 to the ninth lens L9, and L1S2, L2S2, L3S2, L6S2, L7S2, L8S2, and L9S2 are respectively the image-side mirror surfaces of the first lens L1 to the ninth lens L9.

[0038] In this embodiment, the large-area, large-aperture micro lens also meets the following conditions: 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 Among them, 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.

[0039] According to the above data, the large-target-area and large-aperture microlens 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; the working band is 435nm~656nm, and the main wavelength is 546nm. It can meet the requirements of large target area, large aperture and miniaturization.

[0040] Embodiment 2: like Figure 2 As shown, a large-target-area large-aperture micro lens is composed 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, which are arranged in sequence from the object side to the image side. An aperture stop STO is also arranged between the third lens L3 and the fourth lens L4, wherein: The first lens L1 is a plastic spherical lens with negative optical power; The second lens L2 is a plastic aspherical lens with positive refractive power; The third lens L3 is a plastic spherical lens with positive refractive power; The fourth lens L4 is a convex-concave glass spherical lens with negative optical power; The fifth lens L5 is a biconvex glass spherical lens with positive power; The sixth lens L6 is a plastic spherical lens with negative optical power; The seventh lens L7 is a plastic spherical lens with positive refractive power; The eighth lens L8 is a plastic aspherical lens with negative refractive power; The ninth lens L9 is a plastic aspherical lens with positive refractive power; And meet the following conditions: <![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]]> <![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 <!-- 7 -->]]> <![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]]> Wherein, f1~f9 are the focal lengths of the first lens L1 to the ninth lens L9, in units of mm; R 11 , R 21 , R 31 , R 41 , R 51 , R 61 , R71 , R 81 , R 91 R is the curvature radius of the object side mirror surface of the first lens L1 to the ninth lens L9, in mm; 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image side mirror surfaces of the first lens L1 to the ninth lens L9, in units of mm; “-” indicates that the direction is the negative direction. In the figure, IR indicates the filter, and IMA indicates the image surface.

[0041] In this embodiment, the aspheric surface equations of the second lens L2, the eighth lens L8, and the ninth lens L9 all satisfy the following expression: In the formula, Z is the sagittal height, c is the curvature, y is the radial coordinate, k is the cone coefficient, and A is i are the coefficients of the higher-order terms.

[0042] In this embodiment, the aspheric coefficients of the second lens L2, the eighth lens L8, and the ninth lens L9 are as follows: 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 / / Among them, L2S1, L8S1, and L9S1 are respectively the object-side mirror surfaces of the second lens L2, the eighth lens L8, and the ninth lens L9; L2S2, L8S2, and L9S2 are respectively the image-side mirror surfaces of the second lens L2, the eighth lens L8, and the ninth lens L9.

[0043] In this embodiment, the large-area, large-aperture micro lens also meets the following conditions: 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 Among them, 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.

[0044] According to the above data, the large-target-area and large-aperture micro 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; the working band is 435nm~656nm, and the main wavelength is 546nm. It can meet the requirements of large target area, large aperture and miniaturization.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0046] The above-described embodiments only express the more specific and detailed embodiments described in this application, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this application, which all belong to the protection scope of this application. Therefore, the protection scope of the patent application shall be based on the attached claims.

Claims

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

2. The large-aperture micro lens of claim 1, characterized in that: The large-image-surface-large-aperture micro lens also meets the following conditions: 0.02<|f1 / f2|<0.06, 2.509<|f4 / f5|<3, 1.401<|f6 / f7|<1.8, 6.9≤f≤7.7; Among them, 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-target-area large-aperture micro lens, and the unit is mm.

3. The large-aperture micro lens of claim 1, characterized in that: The large-image-surface-large-aperture micro 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%; Wherein, f1~f9 are the focal lengths of the first lens (L1) to the ninth lens (L9) respectively, in mm; "-" indicates that the direction is the negative direction.

4. The large-aperture micro lens of claim 3, characterized in that: The large-image-surface-large-aperture micro 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 are the curvature radii of the object side mirror surfaces of the first lens (L1) to the ninth lens (L9), R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image-side mirror surfaces of the first lens (L1) to the ninth lens (L9), in millimeters. "-" indicates that the direction is the negative direction.

5. The large-aperture micro lens of claim 3, characterized in that: The large-image-surface-large-aperture micro 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 are the curvature radii of the object side mirror surfaces of the first lens (L1) to the ninth lens (L9), R 12 , R 22 , R 32 , R 42 , R 52 , R 62 , R 72 , R 82 , R 92 They are the curvature radii of the image-side mirror surfaces of the first lens (L1) to the ninth lens (L9), in millimeters. "-" indicates that the direction is the negative direction.

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

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

8. The large-aperture micro lens of claim 1, characterized in that: The large-image-surface-large-aperture micro 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 micro lens.

9. The large-aperture micro lens of claim 1, characterized in that: The large-image-surface-large-aperture micro 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), both in mm.

10. The large-aperture micro lens of claim 1, characterized in that: The working wavelength band of the large-target-area large-aperture micro-lens is 435nm~656nm, and the main wavelength is 546nm.

Images