Optical lens and imaging device including the same

Abstract

The present invention provides an optical lens and an imaging device comprising the optical lens, wherein the optical lens comprises, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens; the optical lens provided by the present invention has an image-side telecentric optical path structure, can match a post-spectral spectroscopic system, and has the advantages of a wide spectrum band, a large field of view and small chromatic aberration.

Description

Technical Field

[0001] The present invention relates to the technical field of optical design, and in particular to an optical lens and an imaging device comprising the optical lens. Background Art

[0002] Polarization spectral imaging technology is a new type of optical detection technology. Compared with traditional optical detection technology, the amount of information obtained is greatly increased, and it has gradually been widely used in various fields. With the development of UAV technology, airborne polarization spectral remote sensing payloads using UAVs as remote sensing platforms have developed rapidly, among which polarization spectral intensity modulation technology is an advanced technology in polarization spectral imaging technology. Polarization spectral information of the target to be measured can be obtained simultaneously using the polarization intensity modulation module (PSIM), which can realize static, snapshot, and full-Stokes spectrum measurement of the target light. In order to improve the working efficiency of airborne equipment and the detection range of wide bands, the main development direction of airborne polarization imaging spectrometers is large field of view and wide spectral detection. The main function of the telephoto lens in the imaging spectrometer is to image the target, so the telescope system determines the imaging quality of the imaging spectrometer, and the design of the telephoto lens is crucial.

[0003] In order to ensure that the airborne polarization imaging spectrometer can obtain polarization information of the target, the PSIM module is used to modulate the polarization intensity of the incident light. The PSIM module requires the incident angle of the incident light to be less than 5°. At the same time, in order to complete the splicing with the subsequent spectral splitting system of the imaging spectrometer, the telescope system is required to have an image-side telecentric optical path structure. Therefore, designing the telephoto lens of the airborne polarization spectroscopic imager has certain technical difficulties. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide an optical lens and an imaging device including the optical lens, which can ensure that the requirements of a large field of view and wide band coverage are met under the premise of using a polarization intensity modulation module.

[0005] To achieve the above object, the present invention adopts the following specific technical solutions:

[0006] The present invention provides an optical lens, which comprises, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens;

[0007] The first lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0008] The second lens has negative power, its object side surface is convex, and its image side surface is concave;

[0009] The third lens has negative optical power, and its object side surface is concave, and its image side surface is concave;

[0010] The fourth lens has positive refractive power, its object side surface is concave, and its image side surface is convex;

[0011] The fifth lens has negative optical power, its object side surface is concave, and its image side surface is convex;

[0012] The sixth lens has positive refractive power, its object side surface is concave, and its image side surface is convex;

[0013] The seventh lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0014] The eighth lens has positive power, its object side surface is convex, and its image side surface is concave;

[0015] The ninth lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0016] The tenth lens has positive power, its object side surface is convex, and its image side surface is convex;

[0017] The eleventh lens has negative power, its object side surface is concave, and its image side surface is convex;

[0018] The twelfth lens has positive refractive power, its object side surface is convex, and its image side surface is convex;

[0019] The thirteenth lens has positive power, its object side surface is convex, and its image side surface is convex;

[0020] The fourteenth lens has negative power, and its object-side surface is concave and its image-side surface is concave.

[0021] The fourth lens and the fifth lens form a first cemented lens; the seventh lens and the eighth lens form a second cemented lens; the ninth lens and the tenth lens form a third cemented lens;

[0022] Among them, the third lens, the fourth lens, the eleventh lens and the fourteenth lens are glass aspherical lenses, and the remaining lenses are glass spherical lenses.

[0023] Preferably, it also includes an aperture; the aperture is located between the tenth lens and the eleventh lens; and is used to limit the incident light of the system.

[0024] Preferably, a PSIM module is also included, and the PSIM module is placed between the third lens and the fourth lens; and is used to detect polarization information in the light.

[0025] Preferably, -0.09<Ф1 / Ф<-0.07;

[0026] -0.35<Ф2 / Ф<-0.3;

[0027] -0.35<Ф3 / Ф<-0.25;

[0028] 0.1<Ф4 / Ф<0.3;

[0029] -0.1<Ф5 / Ф<0;

[0030] 0.1<Ф6 / Ф<0.25;

[0031] -1.1<Ф7 / Ф<-0.9;

[0032] 0.7<Ф8 / Ф<0.9;

[0033] -0.8<Ф9 / Ф<-0.7;

[0034] 1.1<Ф 10 / Ф<1.3;

[0035] -0.2<Ф 11 / Ф<-0.1;

[0036] 0.3<Ф 12 / Ф<0.45;

[0037] 0.3<Ф 13 / Ф<0.45;

[0038] -0.5<Ф 14 / Ф<-0.4;

[0039] in:

[0040] Φ1 is the focal length of the first lens;

[0041] Ф2 is the focal length of the second lens;

[0042] Ф3 is the focal power of the third lens;

[0043] Φ4 is the focal power of the fourth lens;

[0044] Φ5 is the optical power of the fifth lens;

[0045] Φ6 is the focal power of the sixth lens;

[0046] Φ7 is the focal length of the seventh lens;

[0047] Ф8 is the focal length of the eighth lens;

[0048] Ф9 is the focal power of the ninth lens;

[0049] Ф 10 is the focal power of the tenth lens;

[0050] Ф 11 is the focal power of the eleventh lens;

[0051] Ф 12 is the focal power of the twelfth lens;

[0052] Ф 13 is the optical power of the thirteenth lens;

[0053] Ф 14 is the focal power of the fourteenth lens;

[0054] Ф is the optical focal length of the optical lens.

[0055] Preferably, the material of the first lens is D-ZLAF61, the aperture range is: 77mm-78mm, and the thickness range is: 19mm-20mm;

[0056] The material of the second lens is H-ZPK7, the aperture range is: 51mm-52mm, the thickness range is: 2mm-3mm;

[0057] The material of the third lens is H-LAF10LA, the aperture range is: 43mm-44mm, and the thickness range is: 2mm-3mm;

[0058] The material of the fourth lens is H-TF5, the aperture range is: 45mm-46mm, the thickness range is: 6mm-7mm;

[0059] The material of the fifth lens is H-ZLAF68N, the aperture range is: 47mm-48mm, and the thickness range is: 4mm-5mm;

[0060] The material of the sixth lens is D-ZK2L, the aperture range is: 41mm-42mm, and the thickness range is: 9mm-10mm;

[0061] The material of the seventh lens is H-ZF11, the aperture range is: 15mm-16mm, the thickness range is: 2mm-3mm;

[0062] The material of the eighth lens is H-ZF7LAGT, the aperture range is: 13mm-14mm, the thickness range is: 1mm-2mm;

[0063] The material of the ninth lens is H-ZLAF55D, the aperture range is: 13mm-14mm, the thickness range is: 0mm-1mm;

[0064] The material of the tenth lens is H-ZPK7, the aperture range is: 12mm-13mm, and the thickness range is: 2mm-3mm;

[0065] The material of the eleventh lens is H-BAF7, the aperture range is: 15mm-16mm, the thickness range is: 3mm-4mm;

[0066] The material of the twelfth lens is H-ZPK7, the aperture range is: 37mm-38mm, and the thickness range is: 9mm-10mm;

[0067] The material of the thirteenth lens is H-FK95N, the aperture range is: 33mm-34mm, and the thickness range is: 9mm-10mm;

[0068] The material of the fourteenth lens is D-LAK5, the aperture range is: 30mm-31mm, and the thickness range is: 3mm-4mm.

[0069] Preferably, the angle θ between the light emitted by the third lens and the optical axis is less than 5°.

[0070] 7. The optical lens according to claim 6 is characterized in that the focal length of the light lens is 20 mm, the F number is 4, the spectral range is 400 nm to 1700 nm, and the field angle is 72°.

[0071] Preferably, the aspheric surface shapes of the third lens, the fourth lens, the eleventh lens and the fourteenth lens are:

[0072]

[0073] in,

[0074] Z is the axial sagittal height of the aspheric surface in the Z direction;

[0075] r is the distance from the point on the aspherical surface to the optical axis;

[0076] c is the curvature of the fitted sphere, which is the inverse of the radius of curvature;

[0077] k is the fitting cone coefficient;

[0078] A, B, and C are the 4th, 6th, and 8th order coefficients of the aspheric polynomial, respectively.

[0079] The present invention also provides an imaging device, comprising the optical lens according to any one of claims 1 to 8 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0080] Compared with the prior art, the present invention has the following advantages:

[0081] 1. The present invention has a field of view angle of 72°, a working spectrum range of 400nm-1700nm, an image-side telecentric optical path structure, and can match the rear spectral splitting system. The focal length of the telephoto lens is 20mm, the F number is 4, the lens has a large field of view and a wide spectrum, and the imaging quality is excellent.

[0082] 2. The present invention adopts a reverse telephoto structure with a negative lens in front and a positive lens in the back to meet the use requirements of the PSIM module. At the same time, a transmission structure is adopted to reduce the polarization effect of the optical system on the incident light. The lens has good polarization detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 is a schematic diagram of the structure of an optical lens provided according to an embodiment of the present invention.

[0084] Figure 2 is a point diagram of an optical lens provided according to an embodiment of the present invention.

[0085] Figure 3 Schematic diagram of an optical transfer function of an optical lens provided according to an embodiment of the present invention.

[0086] Figure 4 Schematic diagram of an axial chromatic aberration curve of an optical lens provided according to an embodiment of the present invention.

[0087] The reference numerals include: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13 and a fourteenth lens 14. DETAILED DESCRIPTION

[0088] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0089] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0090] Figure 1 A schematic structural diagram of an optical lens provided according to an embodiment of the present invention is shown.

[0091] like Figure 1As shown, the optical lens provided by the embodiment of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13 and a fourteenth lens 14 arranged in sequence along the optical axis from the object plane to the image plane; a total of 14 lenses.

[0092] Among them, the third lens 3, the fourth lens 4, the eleventh lens 11 and the fourteenth lens 14 are glass aspherical lenses.

[0093] The optical system provided by the present invention also includes an aperture; the aperture is located in the light path between the tenth lens 10 and the eleventh lens; the aperture can limit the incident light of the system, and the imaging quality can be improved by reasonably adjusting the position of the aperture.

[0094] The optical system provided by the present invention may further include a PSIM module. By placing the PSIM module in the optical path between the third lens 3 and the fourth lens 4, polarization information can be detected and acquired.

[0095] The fourth lens 4 and the fifth lens 5 form a cemented lens; the seventh lens 7 and the eighth lens 8 form a cemented lens; the ninth lens 9 and the tenth lens 10 form a cemented lens; the cemented lens can effectively reduce or even eliminate the system chromatic aberration, and at the same time, the cemented lens can eliminate the air gap between the two lenses, making the optical system more compact.

[0096] The optical system provided by the present invention has a spectral range of 400nm-1700nm and a field of view of 72°, which is beneficial to improving the working efficiency of the airborne polarization remote sensing payload.

[0097] The optical system provided by the present invention is an image-side telecentric optical path structure. The chief rays of the incident light of each field of view of the telephoto lens are vertically incident on the image plane, which can be well spliced ​​with the subsequent spectral splitting system, and fully meets the technical requirements of the telephoto lens as an imaging spectrometer.

[0098] The focal power of the first lens is Ф1, the focal power of the second lens is Ф2, the focal power of the third lens is Ф3, the focal power of the fourth lens is Ф4, the focal power of the fifth lens is Ф5, the focal power of the sixth lens is Ф6, the focal power of the seventh lens is Ф7, the focal power of the eighth lens is Ф8, the focal power of the ninth lens is Ф9, and the focal power of the tenth lens is Ф 10 , the focal length of the eleventh lens is Ф 11 , the focal length of the twelfth lens is Ф 12 , the focal length of the thirteenth lens is Ф 13 , the focal power of the fourteenth lens is Ф 14 .

[0099] The focal length of an optical lens is Φ.

[0100] in:

[0101] -0.09<Ф1 / Ф<-0.07;

[0102] -0.35<Ф2 / Ф<-0.3;

[0103] -0.35<Ф3 / Ф<-0.25;

[0104] 0.1<Ф4 / Ф<0.3;

[0105] -0.1<Ф5 / Ф<0;

[0106] 0.1<Ф6 / Ф<0.25;

[0107] -1.1<Ф7 / Ф<-0.9;

[0108] 0.7<Ф8 / Ф<0.9;

[0109] -0.8<Ф9 / Ф<-0.7;

[0110] 1.1<Ф 10 / Ф<1.3;

[0111] -0.2<Ф 11 / Ф<-0.1;

[0112] 0.3<Ф 12 / Ф<0.45;

[0113] 0.3<Ф 13 / Ф<0.45;

[0114] -0.5<Ф 14 / Ф<-0.4.

[0115] By rationally allocating the optical power of each lens, the system spherical aberration and field curvature can be effectively reduced while ensuring the image quality of each field of view.

[0116] In the embodiment provided by the present invention, the side of any lens adjacent to the object plane is the object-side surface, and the side of any lens adjacent to the image plane is the image-side surface.

[0117] The object-side surface of the first lens 1 is convex toward the object plane, and the image-side surface of the first lens 1 is concave toward the image plane;

[0118] The object-side surface of the second lens 2 is convex toward the object plane, and the image-side surface of the second lens 2 is concave toward the image plane;

[0119] The object-side surface of the third lens 3 is concave toward the object plane, and the image-side surface of the third lens 3 is concave toward the image plane;

[0120] The object-side surface of the fourth lens 4 is concave toward the object plane, and the image-side surface of the fourth lens 4 is convex toward the image plane;

[0121] The object-side surface of the fifth lens 5 is concave toward the object plane, and the image-side surface of the fifth lens 5 is convex toward the image plane;

[0122] The object-side surface of the sixth lens 6 is concave toward the object plane, and the image-side surface of the sixth lens 6 is convex toward the image plane;

[0123] The object-side surface of the seventh lens element 7 is convex toward the object plane, and the image-side surface of the seventh lens element 7 is concave toward the image plane;

[0124] The object-side surface of the eighth lens 8 is convex toward the object plane, and the image-side surface of the eighth lens 8 is concave toward the image plane;

[0125] The object-side surface of the ninth lens element 9 is convex toward the object plane, and the image-side surface of the ninth lens element 9 is concave toward the image plane;

[0126] The object-side surface of the tenth lens 10 is convex toward the object plane, and the image-side surface of the tenth lens 10 is convex toward the image plane;

[0127] The object-side surface of the eleventh lens 11 is concave toward the object plane, and the image-side surface of the eleventh lens 11 is convex toward the image plane;

[0128] The object-side surface of the twelfth lens 12 is convex toward the object plane, and the image-side surface of the twelfth lens 12 is convex toward the image plane;

[0129] The object-side surface of the thirteenth lens 13 is convex toward the object plane, and the image-side surface of the thirteenth lens 13 is convex toward the image plane;

[0130] The object-side surface of the fourteenth lens 14 is concave toward the object plane, and the image-side surface of the fourteenth lens 14 is concave toward the image plane.

[0131] In the embodiments provided by the present invention:

[0132] The first lens 1 is made of D-ZLAF61, 77mm<clear aperture<78mm, 19mm<thickness<20mm;

[0133] The material of the second lens 2 is H-ZPK7, 51mm<clear aperture<52mm, 2mm<thickness<3mm;

[0134] The third lens 3 is made of H-LAF10LA, 43mm<clear aperture<44mm, 2mm<thickness<3mm;

[0135] The fourth lens 4 is made of H-TF5, 45mm<clear aperture<46mm, 6mm<thickness<7mm;

[0136] The fifth lens 5 is made of H-ZLAF68N, 47mm<clear aperture<48mm, 4mm<thickness<5mm;

[0137] The sixth lens 6 is made of D-ZK2L, 41mm<clear aperture<42mm, 9mm<thickness<10mm;

[0138] The seventh lens 7 is made of H-ZF11, 15mm<clear aperture<16mm, 2mm<thickness<3mm;

[0139] The eighth lens 8 is made of H-ZF7LAGT, 13mm<clear aperture<14mm, 1mm<thickness<2mm;

[0140] The ninth lens 9 is made of H-ZLAF55D, 13mm<clear aperture<14mm, 0mm<thickness<1mm;

[0141] The material of the tenth lens 10 is H-ZPK7, 12mm<clear aperture<13mm, 2mm<thickness<3mm;

[0142] The material of the eleventh lens 11 is H-BAF7, 15mm<clear aperture<16mm, 3mm<thickness<4mm;

[0143] The material of the twelfth lens 12 is H-ZPK7, 37mm<clear aperture<38mm, 9mm<thickness<10mm;

[0144] The material of the thirteenth lens 13 is H-FK95N, 33mm<clear aperture<34mm, 9mm<thickness<10mm;

[0145] The material of the fourteenth lens 14 is D-LAK5, 30mm<clear aperture<31mm, 3mm<thickness<4mm.

[0146] The wide-spectrum, large-field-of-view apochromatic telecentric telephoto lenses all use Chengdu Guangming glass. By rationally selecting glass materials and eliminating chromatic aberration, it is beneficial to further improve the performance of wide-band image quality.

[0147] Further, in the embodiments provided by the present invention:

[0148] The first lens 1 has a clear aperture of 77.73 mm and a thickness of 19.75 mm;

[0149] The second lens 2 has a light aperture of 51.42 mm and a thickness of 2.34 mm;

[0150] The third lens 3 has a clear aperture of 43.58 mm and a thickness of 2.77 mm;

[0151] The fourth lens 4 has a light aperture of 45.84 mm and a thickness of 6.74 mm;

[0152] The fifth lens 5 has a light aperture of 47.73 mm and a thickness of 4.78 mm;

[0153] The sixth lens 6 has a light aperture of 41.15 mm and a thickness of 9.38 mm;

[0154] The seventh lens 7 has a light aperture of 15.48 mm and a thickness of 2.87 mm;

[0155] The eighth lens 8 has a light aperture of 13.72 mm and a thickness of 1.94 mm;

[0156] The ninth lens 9 has a light aperture of 13.38 mm and a thickness of 0.60 mm;

[0157] The tenth lens 10 has a light aperture of 12.67 mm and a thickness of 2.85 mm;

[0158] The eleventh lens 11 has a clear aperture of 15.58 mm and a thickness of 3.03 mm;

[0159] The twelfth lens 12 has a light aperture of 37.93 mm and a thickness of 9.46 mm;

[0160] The thirteenth lens 13 has a light aperture of 33.80 mm and a thickness of 9.61 mm;

[0161] The fourteenth lens 14 has a light aperture of 30.36 mm and a thickness of 3.50 mm.

[0162] The optical system provided by the present invention has the advantages of excellent image quality, miniaturization and light weight.

[0163] Figure 2 The figure shows a spot diagram of an optical lens provided according to an embodiment of the present invention.

[0164] like Figure 2 As shown, it can be seen that the diffuse spot size corresponding to each field of view of the optical system provided by the present invention is less than 4.3um, indicating that the lens has good imaging quality.

[0165] Figure 3 A schematic diagram of an optical transfer function of an optical lens provided according to an embodiment of the present invention is shown.

[0166] like Figure 3 As shown in the figure, it can be seen that in the spatial frequency within 55lp / mm, the MTF of the optical system provided by the present invention in each field of view is higher than 0.4, which meets the design requirements of the optical lens.

[0167] Figure 4 A schematic diagram of an axial chromatic aberration curve of an optical lens provided according to an embodiment of the present invention is shown.

[0168] like Figure 4 As shown in the figure, it can be seen that the axial chromatic aberration of the optical system provided by the present invention at different wavelengths of light (0.4um, 0.7um, 1.0um and 1.7um) is within 0.04mm, and approximately intersects in the 0.707 band, indicating that the system chromatic aberration is very small.

[0169] The lens data of the wide-spectrum, large-field-of-view apochromatic telecentric telephoto lens provided by the present invention are:

[0170] Table 1 shows the relevant optical parameters of each lens in the optical lens.

[0171] Table 1

[0172]

[0173] The aspheric surface type expression formula used in the embodiment of the present invention is:

[0174]

[0175] in,

[0176] Z is the axial sagittal height of the aspheric surface in the Z direction;

[0177] r is the distance from the point on the aspherical surface to the optical axis;

[0178] c is the curvature of the fitted sphere, which is the inverse of the radius of curvature;

[0179] k is the fitting cone coefficient;

[0180] A, B, and C are the 4th, 6th, and 8th order coefficients of the aspheric polynomial, respectively.

[0181] Table 2 shows the coefficients of various aspheric high-order terms in this embodiment.

[0182] Table 2

[0183] Face number 4th-order term 6th order term 8th order term 5 7.672E-007 -3.636E-010 5.760E-013 7 -1.380E-006 -9.824E-011 -3.910E-013 19 2.651E-005 5.302E-008 1.341E-009 26 1.354E-005 -2.807E-008 6.651E-011

[0184] The optical system provided by the present invention has a focal length of 20 mm, an F number of 4, an operating band of 400 nm-1700 nm, a field of view of 72°, and a total optical length of 277 mm. The lens is designed as an image-side telecentric structure and can be placed in a PSIM module to be used as a telephoto lens of a polarization spectrum imager. The aspherical technology is used in the design of the lens to correct various aberrations of the system, and the lens has excellent image quality.

[0185] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0186] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An optical lens, characterized in that: The lens comprises, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens; The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The fourth lens has positive refractive power, its object side surface is concave, and its image side surface is convex; The fifth lens has negative optical power, its object side surface is concave, and its image side surface is convex; The sixth lens has positive refractive power, its object side surface is concave, and its image side surface is convex; The seventh lens has negative optical power, its object side surface is convex, and its image side surface is concave; The eighth lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The ninth lens has negative optical power, its object side surface is convex, and its image side surface is concave; The tenth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The eleventh lens has negative optical power, its object side surface is concave, and its image side surface is convex; The twelfth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The thirteenth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fourteenth lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The fourth lens and the fifth lens form a first cemented lens; the seventh lens and the eighth lens form a second cemented lens; the ninth lens and the tenth lens form a third cemented lens; Wherein, the third lens, the fourth lens, the eleventh lens and the fourteenth lens are glass aspherical lenses, and the remaining lenses are glass spherical lenses.

2. The optical lens according to claim 1, characterized in that: It also includes an aperture; the aperture is located between the tenth lens and the eleventh lens; and is used to limit the incident light of the system.

3. The optical lens according to claim 2, characterized in that: It also includes a PSIM module, which is placed between the third lens and the fourth lens and is used to detect polarization information in the light.

4. The optical lens according to claim 3, characterized in that: -0.09<Ф1 / Ф<-0.07; -0.35<Ф2 / Ф<-0.3; -0.35<Ф3 / Ф<-0.25; 0.1<Ф4 / Ф<0.3; -0.1<Ф5 / Ф<0; 0.1<Ф6 / Ф<0.25; -1.1<Ф7 / Ф<-0.9; 0.7<Ф8 / Ф<0.9; -0.8<Ф9 / Ф<-0.7; 1.1<Ф 10 / Ф<1.3; -0.2<Ф 11 / Ф<-0.1; 0.3<Ф 12 / Ф<0.45; 0.3<Ф 13 / Ф<0.45; -0.5<Ф 14 / Ф<-0.4; in: Φ1 is the focal length of the first lens; Φ2 is the focal length of the second lens; Φ3 is the focal length of the third lens; Φ4 is the focal length of the fourth lens; Φ5 is the focal length of the fifth lens; Φ6 is the focal length of the sixth lens; Φ7 is the focal length of the seventh lens; Φ8 is the focal length of the eighth lens; Φ9 is the focal length of the ninth lens; Ф 10 is the focal power of the tenth lens; Ф 11 is the focal power of the eleventh lens; Ф 12 is the focal power of the twelfth lens; Ф 13 is the focal power of the thirteenth lens; Ф 14 is the focal power of the fourteenth lens; Φ is the optical focal length of the optical lens.

5. The optical lens according to claim 4, characterized in that: The material of the first lens is D-ZLAF61, the aperture range is: 77mm-78mm, and the thickness range is: 19mm-20mm; The material of the second lens is H-ZPK7, the aperture range is: 51mm-52mm, and the thickness range is: 2mm-3mm; The material of the third lens is H-LAF10LA, the aperture range is: 43mm-44mm, and the thickness range is: 2mm-3mm; The material of the fourth lens is H-TF5, the aperture range is: 45mm-46mm, and the thickness range is: 6mm-7mm; The material of the fifth lens is H-ZLAF68N, the aperture range is: 47mm-48mm, and the thickness range is: 4mm-5mm; The sixth lens is made of D-ZK2L, has a light aperture range of 41mm-42mm, and a thickness range of 9mm-10mm; The material of the seventh lens is H-ZF11, the aperture range is: 15mm-16mm, and the thickness range is: 2mm-3mm; The eighth lens is made of H-ZF7LAGT, with a light aperture range of 13mm-14mm and a thickness range of 1mm-2mm; The material of the ninth lens is H-ZLAF55D, the aperture range is: 13mm-14mm, and the thickness range is: 0mm-1mm; The material of the tenth lens is H-ZPK7, the aperture range is: 12mm-13mm, and the thickness range is: 2mm-3mm; The material of the eleventh lens is H-BAF7, the aperture range is: 15mm-16mm, and the thickness range is: 3mm-4mm; The material of the twelfth lens is H-ZPK7, the aperture range is: 37mm-38mm, and the thickness range is: 9mm-10mm; The material of the thirteenth lens is H-FK95N, the aperture range is: 33mm-34mm, and the thickness range is: 9mm-10mm; The material of the fourteenth lens is D-LAK5, the light aperture range is: 30mm-31mm, and the thickness range is: 3mm-4mm.

6. The optical lens according to claim 5, characterized in that: The included angle θ between the light emitted by the third lens and the optical axis is less than 5°.

7. The optical lens according to claim 6, characterized in that: The focal length of the light lens is 20 mm, the F number is 4, the spectral range is 400 nm to 1700 nm, and the viewing angle is 72°.

8. The optical lens according to claim 7, characterized in that: The aspheric surface shapes of the third lens, the fourth lens, the eleventh lens and the fourteenth lens are: in, Z is the axial sagittal height of the aspheric surface in the Z direction; r is the distance from the point on the aspherical surface to the optical axis; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitting cone coefficient; A, B, and C are the 4th, 6th, and 8th order coefficients of the aspheric polynomial, respectively.

9. An imaging device, characterized in that: The optical lens comprises the optical lens according to any one of claims 1 to 8 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images