Optical lens

Abstract

The present invention provides an optical lens, which has seven lenses, and along the optical axis from the object side to the imaging surface, they are: a first lens with optical power; a second lens with optical power; a third lens with positive optical power, whose object side surface is convex; a fourth lens with negative optical power, whose image side surface is concave; a fifth lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a sixth lens with positive optical power, whose object side surface and image side surface are both convex; a seventh lens with negative optical power; the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.6<IH / f<0.8. The optical lens has the advantages of long focus and miniaturization, low cost and high resolution, and can be used in weak light and harsh environments.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and particularly to an optical lens. Background Art

[0002] With the rapid development of advanced driver assistance systems (ADAS), optical lenses have a wider range of applications and developments. These include dash cams, automatic parking, forward collision warning (FCW), lane departure warning (LDW), pedestrian detection warning (PCW), etc.

[0003] In long-distance imaging, a longer focal length of the lens is required. However, a longer focal length will result in a longer overall length of the lens, which is not conducive to the miniaturization of the lens. At the same time, such lenses require a larger aperture to ensure good imaging quality at night or in environments with relatively weak light conditions. Therefore, it is necessary to develop an optical lens that combines long focal length with miniaturization, low cost with high resolution, and can be used in low light and harsh environments. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide an optical lens, which has the advantages of combining long focal length with miniaturization, low cost with high resolution, and can be used in low light and harsh environments.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] An optical lens, comprising a total of seven lenses, which are arranged along the optical axis from the object side to the imaging surface in sequence as follows:

[0007] A first lens with a focal power;

[0008] A second lens with a focal power;

[0009] A third lens with a positive focal power, the object side surface of which is convex;

[0010] A fourth lens with a negative focal power, the image side surface of which is concave;

[0011] A fifth lens with a negative focal power, the object side surface of which is convex and the image side surface of which is concave;

[0012] A sixth lens with a positive focal power, both the object side surface and the image side surface of which are convex;

[0013] A seventh lens with a negative focal power;

[0014] For the optical lens, the effective focal length f and the true image height IH corresponding to the maximum field of view angle satisfy: 0.6 < IH / f < 0.8.

[0015] Preferably, for the optical lens, the overall optical length TTL and the effective focal length f satisfy: 1.6 < TTL / f < 2.0.

[0016] Preferably, the back focal length BFL and the effective focal length f of the optical lens satisfy: 0.15 ≤ BFL / f.

[0017] Preferably, the effective focal length f, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.95 < (IH / 2) / (f × tan(FOV / 2)) < 1.15.

[0018] Preferably, the curvature radius R5 of the object side surface of the third lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.9 < R5 / R8 < 3.5.

[0019] Preferably, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R of the image side surface 10 satisfy: 1.0 < R9 / R 10 < 25.0.

[0020] Preferably, the curvature radius R of the image side surface of the fifth lens 10 and the curvature radius R of the object side surface of the sixth lens 11 satisfy: 0.4 < R 10 / R 11 < 3.5.

[0021] Preferably, the curvature radius R of the object side surface of the sixth lens 11 and the curvature radius R of the image side surface 12 satisfy: -5.0 < R 11 / R 12 < 0.

[0022] Preferably, the incident angle CRA of the chief ray of the maximum field of view of the optical lens on the image plane satisfies: 8° < CRA < 28°.

[0023] Preferably, the overall length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively satisfy: 0.4 < ∑CT / TTL < 0.7.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: By reasonably matching the lens shapes and the combination of optical powers between the lenses, the optical lens of the present application achieves the effects of having a long focal length while being miniaturized, having a low cost while having a high resolution, and being able to be used in low light and harsh environments.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0027] Figure 1 It is a schematic structural diagram of the optical lens according to Embodiment 1 of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the optical lens according to Embodiment 2 of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the optical lens according to Embodiment 3 of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the optical lens according to Embodiment 4 of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the optical lens according to Embodiment 5 of the present invention;

[0032] Figure 6 It is a schematic structural diagram of the optical lens according to Embodiment 6 of the present invention;

[0033] Figure 7 It is a schematic structural diagram of the optical lens according to Embodiment 7 of the present invention;

[0034] Figure 8 It is a schematic structural diagram of the optical lens according to Embodiment 8 of the present invention;

[0035] Figure 9 It is a schematic structural diagram of the optical lens according to Embodiment 9 of the present invention;

[0036] Figure 10 It is a schematic structural diagram of the optical lens according to Embodiment 10 of the present invention;

[0037] Figure 11 It is a schematic structural diagram of the optical lens according to Embodiment 11 of the present invention;

[0038] Figure 12 It is a schematic structural diagram of the optical lens according to Embodiment 12 of the present invention.

[0039] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0040] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the drawings, for the sake of convenience of illustration, the thickness, size and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0043] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0044] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features, rather than modifying the individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the ordinary understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as terms defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0047] The optical lens according to an embodiment of the present invention sequentially includes, from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0048] In some embodiments, the third lens may have a positive focal power, which is beneficial for converging light while reducing the light deflection angle, enabling the light to transition smoothly. The object side surface of the third lens is convex, which is beneficial for converging light while increasing the relative illumination of the optical lens, enhancing the brightness of the optical lens at the image plane and avoiding the generation of vignetting.

[0049] In some embodiments, the fourth lens may have a negative focal power, which is beneficial for increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. The image side surface of the fourth lens is concave, which can converge the marginal field light rays, avoid excessive divergence of light rays and the generation of various high-order aberrations, and improve the imaging quality of the optical lens.

[0050] In some embodiments, the fifth lens may have a negative focal power, which is beneficial for increasing the imaging area of the optical lens, avoiding excessive light deflection caused by the over-concentration of the negative focal power of the fourth lens, reducing the difficulty of aberration correction of the optical lens, and improving the imaging quality of the optical lens. The object side surface of the fifth lens is convex and the image side surface is concave, which can transmit more light rays to the rear end of the optical lens while reducing the generation of various aberrations, increasing both the imaging area of the optical lens and the imaging quality of the optical lens.

[0051] In some embodiments, the sixth lens may have a positive focal power, which is beneficial for converging light while reducing the light deflection angle, enabling the light to transition smoothly. Both the object side surface and the image side surface of the sixth lens are convex, which is beneficial for converging light while increasing the relative illumination of the optical lens, enhancing the brightness of the optical lens at the image plane and avoiding the generation of vignetting.

[0052] In some embodiments, the seventh lens may have a negative focal power, which is beneficial for increasing the imaging area of the optical lens and improving the imaging quality of the optical lens.

[0053] In some embodiments, the third lens and the fourth lens or the fifth lens and the sixth lens may be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing technology difficulty of the optical lens and improving the assembly yield of the optical lens.

[0054] In some embodiments, a diaphragm for restricting the light beam may be provided between the first lens and the second lens or between the second lens and the third lens, which can reduce the generation of ghost images of the optical lens, and is beneficial for converging the light rays entering the optical system and reducing the aperture of the rear end of the optical lens.

[0055] In some embodiments, the aperture value FNO of the optical lens satisfies: FNO ≤ 1.6. Meeting the above range is beneficial to achieving the large aperture characteristic, and can also ensure the clarity of the image in low light environments or at night.

[0056] In some embodiments, the maximum field of view FOV of the optical lens satisfies: FOV < 40°. Meeting the above range is beneficial to achieving the telephoto characteristic, so as to be able to obtain scene information at a farther distance and meet the requirements of the optical lens for detecting distant scenes.

[0057] In some embodiments, the incident angle CRA of the principal ray of the maximum field of view of the optical lens on the image plane satisfies: 8° < CRA < 28°. Meeting the above range can make the allowable error value between the CRA of the optical lens and the CRA of the chip photosensitive element larger, and improve the adaptability of the optical lens to the image sensor.

[0058] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f satisfy: 1.6 < TTL / f < 2.0. Meeting the above range can effectively limit the length of the lens and is beneficial to realizing the miniaturization of the optical lens.

[0059] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 0.6 < IH / f < 0.8. Meeting the above range can enable the optical lens to not only take into account the large image plane characteristic but also have good imaging quality.

[0060] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f satisfy: 0.15 ≤ BFL / f. Meeting the above range is beneficial to achieving a balance between obtaining good imaging quality and having an optical back focal length that is easy to assemble, ensuring the imaging quality of the optical lens while reducing the assembly process difficulty of the camera module.

[0061] In some embodiments, the entrance pupil diameter EPD of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 1.0 < IH / EPD < 1.3. Meeting the above range can increase the width of the light beam incident on the optical lens, so that the brightness of the optical lens at the image plane is improved and vignetting is avoided.

[0062] In some embodiments, the effective focal length f, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.95 < (IH / 2) / (f × tan(FOV / 2)) < 1.15. Meeting the above range is beneficial to controlling the ideal image height to be close to the actual image height, achieving small distortion, reducing the image quality adjustment at the module or product end, and reducing the host image quality processing burden.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: |f1 / f| < 25.0. Meeting the above range can make the first lens have an appropriate optical power, reduce the working aperture of the first lens, and reduce the volume of the optical lens.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: |f2 / f| < 15.0. Meeting the above range can make the second lens have an appropriate optical power, correct various aberrations of the optical lens, and improve the imaging quality of the optical lens.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0 < f3 / f < 2.0. Meeting the above range can make the third lens have an appropriate positive optical power, which is beneficial to the smooth transition of light rays, correct various aberrations of the optical lens at the same time, and improve the imaging quality of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -100.0 < f4 / f < 0. Meeting the above range can make the fourth lens have an appropriate negative optical power, which is beneficial to increasing the imaging area of the optical lens, correct various aberrations of the optical lens at the same time, and improve the imaging quality of the optical lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -22.0 < f5 / f < 0. Meeting the above range can make the fifth lens have an appropriate negative optical power, which is beneficial to the smooth transition of light rays, correct various aberrations of the optical lens at the same time, and improve the imaging quality of the optical lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0 < f6 / f < 1.0. Meeting the above range can make the sixth lens have an appropriate positive optical power, which is beneficial to the smooth transition of light rays, correct the spherical aberration and coma of the optical lens at the same time, and improve the imaging quality of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -1.5 < f7 / f < 0. Meeting the above range can make the seventh lens have an appropriate negative optical power, which is beneficial to increasing the imaging area of the optical lens, correct the spherical aberration, coma and astigmatism of the optical lens at the same time, and improve the imaging quality of the optical lens.

[0070] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.9 < R5 / R8 < 3.5. Satisfying the above range can make the object side surface of the third lens and the image side surface of the fourth lens have a similar surface shape, balance the field curvature of the third lens and the fourth lens, and improve the imaging quality of the optical lens.

[0071] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R 10 Satisfy: 1.0 < R9 / R 10 < 25.0. Satisfying the above range can make the object side surface of the fifth lens and the image side surface have a similar surface shape, reduce the field curvature generated by the fifth lens itself, and improve the imaging quality of the optical lens.

[0072] In some embodiments, the radius of curvature R 10 of the image side surface of the fifth lens and the radius of curvature R 11 of the object side surface of the sixth lens satisfy: 0.4 < R 10 / R 11 < 3.5. Satisfying the above range can make the image side surface of the fifth lens and the object side surface of the sixth lens have a similar surface shape, balance the field curvature of the fifth lens and the sixth lens, and improve the imaging quality of the optical lens.

[0073] In some embodiments, the radius of curvature R 11 of the object side surface of the sixth lens and the radius of curvature R 12 of the image side surface satisfy: -5.0 < R 11 / R 12 < 0. Satisfying the above range can make the object side surface and the image side surface of the sixth lens approximate a symmetric structure, balance the coma generated by the sixth lens itself, and improve the imaging quality of the optical lens.

[0074] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the clear aperture D1 of the object side surface of the first lens satisfy: 0.9 < D1 / IH < 1.3. Satisfying the above range is beneficial to balance between the large image plane at the imaging end and the small aperture at the object side end, ensure the imaging quality of the optical lens, and reduce the front aperture.

[0075] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.4 < ∑CT / TTL < 0.7. Satisfying the above range can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens.

[0076] To enable the system to have better optical performance, multiple aspherical lenses are used in the lens, and the surface shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0077] ;

[0078] Among them, z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients respectively.

[0079] The present invention will be further described below with multiple embodiments. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are partially different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0080] Embodiment 1

[0081] Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens provided in Embodiment 1 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0082] The first lens L1 has a negative optical power, and its object side S1 and image side S2 are both concave surfaces;

[0083] Diaphragm ST;

[0084] The second lens L2 has a positive optical power, and its object side S3 and image side S4 are both convex surfaces;

[0085] The third lens L3 has a positive optical power, and its object side S5 and image side S6 are both convex surfaces;

[0086] The fourth lens L4 has a negative optical power, and its object side S7 and image side S8 are both concave surfaces;

[0087] The fifth lens L5 has a negative optical power, its object side S9 is convex, and its image side S10 is concave;

[0088] The sixth lens L6 has a positive optical power, and its object side S11 and image side S12 are both convex surfaces;

[0089] The seventh lens L7 has a negative optical power, its object side S13 is concave, and its image side S14 is convex;

[0090] The third lens L3 and the fourth lens L4 can be glued together to form a glued lens;

[0091] Both the object side S15 and the image side S16 of the filter G1 are flat surfaces.

[0092] Both the object side S17 and the image side S18 of the protective glass G2 are flat surfaces.

[0093] The imaging surface S19 is a flat surface.

[0094] The relevant parameters of each lens in the optical lens of Embodiment 1 are shown in Table 1-1.

[0095] Table 1-1

[0096]

[0097] The surface type parameters of the aspherical lens in the optical lens of Embodiment 1 are shown in Table 1-2.

[0098] Table 1-2

[0099]

[0100] Embodiment 2

[0101] Please refer to Figure 2 , which shows the structural schematic diagram of the optical lens provided in Embodiment 2 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0102] The first lens L1 has a negative optical power, and both its object side S1 and image side S2 are concave surfaces.

[0103] Diaphragm ST

[0104] The second lens L2 has a positive optical power, its object side S3 is a concave surface, and its image side S4 is a convex surface.

[0105] The third lens L3 has a positive optical power, its object side S5 is a convex surface, and its image side S6 is a concave surface.

[0106] The fourth lens L4 has a negative optical power, its object side S7 is a convex surface, and its image side S8 is a concave surface.

[0107] The fifth lens L5 has a negative optical power, its object side S9 is a convex surface, and its image side S10 is a concave surface.

[0108] The sixth lens L6 has a positive optical power, and both its object side S11 and image side S12 are convex surfaces.

[0109] The seventh lens L7 has a negative optical power, its object side S13 is convex, and its image side S14 is concave;

[0110] The third lens L3 and the fourth lens L4 can be cemented to form a cemented lens.

[0111] The relevant parameters of each lens in the optical lens of Embodiment 2 are shown in Table 2-1.

[0112] Table 2-1

[0113]

[0114] The surface type parameters of the aspherical lens in the optical lens of Embodiment 2 are shown in Table 2-2.

[0115] Table 2-2

[0116]

[0117] Embodiment 3

[0118] Please refer to Figure 3 , which shows a schematic structural diagram of the optical lens provided in Embodiment 3 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0119] The first lens L1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave;

[0120] Diaphragm ST;

[0121] The second lens L2 has a positive optical power, its object side S3 is convex, and its image side S4 is concave;

[0122] The third lens L3 has a positive optical power, its object side S5 and image side S6 are both convex;

[0123] The fourth lens L4 has a negative optical power, its object side S7 and image side S8 are both concave;

[0124] The fifth lens L5 has a negative optical power, its object side S9 is convex, and its image side S10 is concave;

[0125] The sixth lens L6 has a positive optical power, its object side S11 and image side S12 are both convex;

[0126] The seventh lens L7 has a negative optical power, its object side S13 is concave, and its image side S14 is convex;

[0127] The third lens L3 and the fourth lens L4 can be cemented together to form a cemented lens.

[0128] The relevant parameters of each lens in the optical lens of Embodiment 3 are shown in Table 3-1.

[0129] Table 3-1

[0130]

[0131] The aspherical lens surface parameters of the optical lens of Embodiment 3 are shown in Table 3-2.

[0132] Table 3-2

[0133]

[0134] Embodiment 4

[0135] Please refer to Figure 4 , which shows a schematic structural diagram of the optical lens provided in Embodiment 4 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0136] The first lens L1 has a negative optical power. Its object side surface S1 is concave, and its image side surface S2 is convex;

[0137] Diaphragm ST;

[0138] The second lens L2 has a positive optical power. Its object side surface S3 and image side surface S4 are both convex;

[0139] The third lens L3 has a positive optical power. Its object side surface S5 and image side surface S6 are both convex;

[0140] The fourth lens L4 has a negative optical power. Its object side surface S7 and image side surface S8 are both concave;

[0141] The fifth lens L5 has a negative optical power. Its object side surface S9 is convex, and its image side surface S10 is concave;

[0142] The sixth lens L6 has a positive optical power. Its object side surface S11 and image side surface S12 are both convex;

[0143] The seventh lens L7 has a negative optical power. Its object side surface S13 is concave, and its image side surface S14 is convex;

[0144] The third lens L3 and the fourth lens L4 can be cemented together to form a cemented lens.

[0145] The relevant parameters of each lens in the optical lens of Embodiment 4 are shown in Table 4-1.

[0146] Table 4-1

[0147]

[0148] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0149] Table 4-2

[0150]

[0151] Example 5

[0152] Please refer to Figure 5 , which shows the structural schematic diagram of the optical lens provided in Embodiment 5 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0153] The first lens L1 has a negative optical power. Its object side surface S1 is concave, and its image side surface S2 is convex.

[0154] The second lens L2 has a negative optical power. Its object side surface S3 is concave, and its image side surface S4 is convex.

[0155] Diaphragm ST

[0156] The third lens L3 has a positive optical power. Its object side surface S5 and image side surface S6 are both convex.

[0157] The fourth lens L4 has a negative optical power. Its object side surface S7 is convex, and its image side surface S8 is concave.

[0158] The fifth lens L5 has a negative optical power. Its object side surface S9 is convex, and its image side surface S10 is concave.

[0159] The sixth lens L6 has a positive optical power. Its object side surface S11 and image side surface S12 are both convex.

[0160] The seventh lens L7 has a negative optical power. Its object side surface S13 is convex, and its image side surface S14 is concave.

[0161] The fifth lens L5 and the sixth lens L6 can be glued together to form a glued lens.

[0162] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0163] Table 5-1

[0164]

[0165] The surface parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0166] Table 5-2

[0167]

[0168] Embodiment 6

[0169] Please refer to Figure 6 , which shows a schematic structural diagram of the optical lens provided in Embodiment 6 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0170] The first lens L1 has a negative optical power. Its object side surface S1 is concave, and its image side surface S2 is convex.

[0171] The second lens L2 has a negative optical power. Its object side surface S3 is concave, and its image side surface S4 is convex.

[0172] Diaphragm ST

[0173] The third lens L3 has a positive optical power. Its object side surface S5 and image side surface S6 are both convex.

[0174] The fourth lens L4 has a negative optical power. Its object side surface S7 is convex, and its image side surface S8 is concave.

[0175] The fifth lens L5 has a negative optical power. Its object side surface S9 is convex, and its image side surface S10 is concave.

[0176] The sixth lens L6 has a positive optical power. Its object side surface S11 and image side surface S12 are both convex.

[0177] The seventh lens L7 has a negative optical power. Its object side surface S13 is convex, and its image side surface S14 is concave.

[0178] The fifth lens L5 and the sixth lens L6 can be glued together to form a glued lens.

[0179] The relevant parameters of each lens in the optical lens of Embodiment 6 are shown in Table 6-1.

[0180] Table 6-1

[0181]

[0182] The surface parameters of the aspherical lens of the optical lens in Embodiment 6 are shown in Table 6-2.

[0183] Table 6-2

[0184]

[0185] Example 7

[0186] Please refer to Figure 7 , which shows a schematic structural diagram of the optical lens provided in Embodiment 7 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0187] The first lens L1 has a negative optical power, and its object side S1 and image side S2 are concave surfaces;

[0188] The second lens L2 has a negative optical power, its object side S3 is a concave surface, and its image side S4 is a convex surface;

[0189] Diaphragm ST;

[0190] The third lens L3 has a positive optical power, and its object side S5 and image side S6 are both convex surfaces;

[0191] The fourth lens L4 has a negative optical power, its object side S7 is a convex surface, and its image side S8 is a concave surface;

[0192] The fifth lens L5 has a negative optical power, its object side S9 is a convex surface, and its image side S10 is a concave surface;

[0193] The sixth lens L6 has a positive optical power, and its object side S11 and image side S12 are both convex surfaces;

[0194] The seventh lens L7 has a negative optical power, its object side S13 is a convex surface, and its image side S14 is a concave surface;

[0195] The fifth lens L5 and the sixth lens L6 can be glued together to form a cemented lens.

[0196] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0197] Table 7-1

[0198]

[0199] The aspheric surface parameters of the aspheric lenses in the optical lens of Example 7 are shown in Table 7-2.

[0200] Table 7-2

[0201]

[0202] Example 8

[0203] Please refer to Figure 8 , which shows a schematic structural diagram of an optical lens provided in Embodiment 8 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0204] The first lens L1 has a negative optical power. Its object side surface S1 is convex, and its image side surface S2 is concave;

[0205] The second lens L2 has a negative optical power. Its object side surface S3 is concave, and its image side surface S4 is convex;

[0206] The diaphragm ST;

[0207] The third lens L3 has a positive optical power. Its object side surface S5 and image side surface S6 are both convex;

[0208] The fourth lens L4 has a negative optical power. Its object side surface S7 is convex, and its image side surface S8 is concave;

[0209] The fifth lens L5 has a negative optical power. Its object side surface S9 is convex, and its image side surface S10 is concave;

[0210] The sixth lens L6 has a positive optical power. Its object side surface S11 and image side surface S12 are both convex;

[0211] The seventh lens L7 has a negative optical power. Its object side surface S13 is convex, and its image side surface S14 is concave;

[0212] The fifth lens L5 and the sixth lens L6 can be glued together to form a cemented lens.

[0213] The relevant parameters of each lens in the optical lens of Embodiment 8 are shown in Table 8-1.

[0214] Table 8-1

[0215]

[0216] The aspheric lens surface type parameters of the optical lens of Embodiment 8 are shown in Table 8-2.

[0217] Table 8-2

[0218]

[0219] Embodiment 9

[0220] Please refer to Figure 9, which shows a schematic structural diagram of the optical lens provided in Embodiment 9 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0221] The first lens L1 has a positive optical power, and its object side surface S1 and image side surface S2 are both convex surfaces;

[0222] The second lens L2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0223] Diaphragm ST;

[0224] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave;

[0225] The fourth lens L4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave;

[0226] The fifth lens L5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave;

[0227] The sixth lens L6 has a positive optical power, and its object side surface S11 and image side surface S12 are both convex surfaces;

[0228] The seventh lens L7 has a negative optical power, its object side surface S13 is convex, and its image side surface S14 is concave;

[0229] The third lens L3 and the fourth lens L4 can be glued together to form a glued lens.

[0230] The relevant parameters of each lens in the optical lens of Embodiment 9 are shown in Table 9-1.

[0231] Table 9-1

[0232]

[0233] The aspheric lens surface type parameters of the optical lens of Embodiment 9 are shown in Table 9-2.

[0234] Table 9-2

[0235]

[0236] Embodiment 10

[0237] Please refer to Figure 10, which shows a schematic structural diagram of the optical lens provided in Embodiment 10 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0238] The first lens L1 has a positive optical power, and its object side surface S1 and image side surface S2 are both convex surfaces;

[0239] The second lens L2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0240] Diaphragm ST;

[0241] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave;

[0242] The fourth lens L4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave;

[0243] The fifth lens L5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave;

[0244] The sixth lens L6 has a positive optical power, and its object side surface S11 and image side surface S12 are both convex surfaces;

[0245] The seventh lens L7 has a negative optical power, its object side surface S13 is convex, and its image side surface S14 is concave;

[0246] The third lens L3 and the fourth lens L4 can be glued together to form a glued lens.

[0247] The relevant parameters of each lens in the optical lens of Embodiment 10 are shown in Table 10-1.

[0248] Table 10-1

[0249]

[0250] The aspherical lens surface type parameters of the optical lens of Embodiment 10 are shown in Table 10-2.

[0251] Table 10-2

[0252]

[0253] Embodiment 11

[0254] Please refer to Figure 11, which is a schematic structural diagram of the optical lens provided in Embodiment 11 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0255] The first lens L1 has a positive optical power, and its object side surface S1 and image side surface S2 are both convex surfaces;

[0256] The second lens L2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave;

[0257] Stop ST;

[0258] The third lens L3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave;

[0259] The fourth lens L4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave;

[0260] The fifth lens L5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave;

[0261] The sixth lens L6 has a positive optical power, and its object side surface S11 and image side surface S12 are both convex surfaces;

[0262] The seventh lens L7 has a negative optical power, its object side surface S13 is convex, and its image side surface S14 is concave;

[0263] The third lens L3 and the fourth lens L4 can be glued together to form a glued lens.

[0264] The relevant parameters of each lens in the optical lens of Embodiment 11 are shown in Table 11-1.

[0265] Table 11-1

[0266]

[0267] The aspheric lens surface type parameters of the optical lens in Embodiment 11 are shown in Table 11-2.

[0268] Table 11-2

[0269]

[0270] Embodiment 12

[0271] Please refer to Figure 12, which is a schematic structural diagram of the optical lens provided in Embodiment 12 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0272] The first lens L1 has a positive optical power, and its object side S1 and image side S2 are both convex surfaces;

[0273] The second lens L2 has a negative optical power, its object side S3 is a convex surface, and its image side S4 is a concave surface;

[0274] Diaphragm ST;

[0275] The third lens L3 has a positive optical power, its object side S5 is a convex surface, and its image side S6 is a concave surface;

[0276] The fourth lens L4 has a negative optical power, its object side S7 is a convex surface, and its image side S8 is a concave surface;

[0277] The fifth lens L5 has a negative optical power, its object side S9 is a convex surface, and its image side S10 is a concave surface;

[0278] The sixth lens L6 has a positive optical power, and its object side S11 and image side S12 are both convex surfaces;

[0279] The seventh lens L7 has a negative optical power, its object side S13 is a convex surface, and its image side S14 is a concave surface;

[0280] The third lens L3 and the fourth lens L4 can be glued together to form a glued lens.

[0281] The relevant parameters of each lens in the optical lens of Embodiment 12 are shown in Table 12-1.

[0282] Table 12-1

[0283]

[0284] The aspheric lens surface type parameters of the optical lens of Embodiment 12 are shown in Table 12-2.

[0285] Table 12-2

[0286]

[0287] Please refer to Table 13-1, Table 13-2, and Table 13-3 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value FNO, the true image height IH, the maximum field of view FOV of the optical lens, and the values corresponding to each conditional formula in each embodiment.

[0288] Table 13-1

[0289]

[0290] Table 13-2

[0291]

[0292] Table 13-3

[0293]

[0294] In summary, through the reasonable combination of the lens shapes and the combination of optical powers between the lenses in the optical lens according to the embodiments of the present invention, the effects of having a long focal length while taking into account miniaturization, having a low cost while taking into account high resolution, and being able to be used in low light and harsh environments are achieved.

[0295] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0296] The above-described embodiments only represent several implementation manners of the present invention. The descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An optical lens, consisting of seven lenses in total, characterized in that, In order from the object side to the imaging surface along the optical axis are as follows: A first lens with a focal power; A second lens with a focal power; A third lens with a positive focal power, the object side surface of which is convex; A fourth lens with a negative focal power, the image side surface of which is concave; A fifth lens with a negative focal power, the object side surface of which is convex and the image side surface of which is concave; A sixth lens with a positive focal power, both the object side surface and the image side surface of which are convex; A seventh lens with a negative focal power; The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle satisfy: 0.6 < IH / f < 0.8; The back focal length BFL of the optical lens and the effective focal length f satisfy: 0.15 ≤ BFL / f ≤ 0.46; The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0 < f6 / f < 1.

0.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the effective focal length f satisfy: 1.6 < TTL / f < 2.

0.

3. The optical lens according to claim 1, wherein The effective focal length f, the maximum field of view angle FOV, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.95 < (IH / 2) / (f × tan(FOV / 2)) < 1.

15.

4. The optical lens according to claim 1, wherein The curvature radius R5 of the object side surface of the third lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.9 < R5 / R8 < 3.

5.

5. The optical lens according to claim 1, characterized in that, The curvature radius R9 of the object side of the fifth lens and the curvature radius R of the image side 10 Satisfy: 1.0 < R9 / R 10 < 25.

0.

6. The optical lens according to claim 1, wherein The curvature radius R of the image side surface of the fifth lens 10 and the curvature radius R of the object side surface of the sixth lens 11 satisfy: 0.4 < R 10 / R 11 < 3.

5.

7. The optical lens according to claim 1, characterized in that, The curvature radius R of the object side of the sixth lens 11 and the curvature radius R of the image side 12 satisfy: -5.0 < R 11 / R 12 < 0.

8. The optical lens according to claim 1, characterized in that The incident angle CRA of the chief ray of the maximum field of view angle of the optical lens on the image surface satisfies: 8° < CRA < 28°.

9. The optical lens according to claim 1, wherein The total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively satisfy: 0.4 < ∑CT / TTL < 0.7.

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