Optical lens

Abstract

This invention provides an optical lens comprising seven lenses, arranged sequentially along the optical axis from the object side to the image plane: a first lens with negative optical power, its image-side surface being concave; a second lens with positive optical power, its image-side surface being convex; a third lens with negative optical power, its object-side surface being concave and its image-side surface being convex; a fourth lens with negative optical power; a fifth lens with positive optical power, its object-side surface being convex; a sixth lens with negative optical power, its object-side surface being convex near the optical axis and its image-side surface being concave; and a seventh lens with positive optical power, its object-side surface being convex and its image-side surface being convex. The optical lens provided by this invention, through a specific combination of surface shapes and a reasonable distribution of optical power, achieves excellent infrared confocal performance while also possessing one or more advantages such as a large field of view, a large aperture, and miniaturization.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] With the rapid development of technology, wide-angle lenses, due to their advantages of large field of view and wide shooting area, are widely used in smart homes, security, automotive, and other fields. Due to differences in application environments, consumers have varying performance requirements for lenses, but overall, these requirements are becoming increasingly stringent. In some complex environments, lenses are required not only to remain in focus under large temperature differences but also to meet shooting needs in both day and night conditions. Therefore, current wide-angle lenses are continuously evolving towards higher image quality, smaller size, and infrared confocal lenses, making the development of new infrared confocal lens architectures a promising area for exploration. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens that has the advantages of infrared confocal focusing and excellent imaging quality.

[0004] The technical solution adopted in this invention is as follows:

[0005] An optical lens comprises seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0006] The first lens with negative optical power has a concave image-side surface.

[0007] A second lens with positive optical power has a convex image-side surface.

[0008] A third lens with negative optical power has a concave object side and a convex image side.

[0009] A fourth lens with negative optical power;

[0010] The fifth lens with positive optical power has a convex object-side surface;

[0011] The sixth lens with negative optical power has a convex object-side surface near the optical axis and a concave image-side surface.

[0012] The seventh lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0013] The combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens, and the combined focal length f567 of the fifth lens, the sixth lens, and the seventh lens satisfy the following condition: -1.8 <f1234 / f567<-0.6。

[0014] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5 < TTL / f < 7.5; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.7 < TTL / IH < 3.8.

[0015] Further preferably, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 90°; the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.2 < IH / EPD < 4.8.

[0016] Further preferably, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.7 < IH / f < 2.3; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.7 < BFL / f < 2.1.

[0017] Further preferably, the clear aperture diameter d1 of the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.19 < d1 / (IH / 2) / tan(FOV / 2) < 0.37.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.3 < f1 / f < -0.9; the image side curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.8 < R2 / f < 1; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.7 < f2 / f < 2.7; the image side curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -1.9 < R4 / f < -1.1.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -150 < f3 / f < -9; the object side curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.6 < R5 / f < -0.8; the image side curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -1.95 < R6 / f < -0.95.

[0020] More preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.9 < f6 / f < -1.4; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 13.5 < R11 / f < 40; the image-side curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.9 < R12 / f < 1.8.

[0021] More preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 2.1; the object-side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: 1 < R13 / f < 2.4; the image-side curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -5.2 < R14 / f < -1.4.

[0022] More preferably, the object-side curvature radius R11 of the sixth lens and the image-side curvature radius R12 of the sixth lens satisfy: 0.7 < (R11 - R12) / (R11 + R12) < 1; the object-side curvature radius R13 of the seventh lens and the image-side curvature radius R14 of the seventh lens satisfy: |(R13 + R14) / (R13 - R14)| < 0.7.

[0023] The optical lens provided by the present invention adopts seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberration, and enhance the imaging quality of the optical lens, enabling the lens to have one or more advantages such as a large field of view, a large aperture, and miniaturization while achieving a good infrared confocal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0025] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 2 is a MTF curve graph of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0028] Figure 4 is a MTF curve graph of the optical lens in Embodiment 2 of the present invention.

[0029] Figure 5This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0030] Figure 6 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0031] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0032] Figure 8 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0033] Figure 9 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0034] Figure 10 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0035] Figure 11 This is a schematic diagram of the optical lens in Embodiment 6 of the present invention.

[0036] Figure 12 This is the MTF curve of the optical lens in Embodiment 6 of the present invention.

[0037] Figure 13 This is a schematic diagram of the optical lens in Embodiment 7 of the present invention.

[0038] Figure 14 This is the MTF curve of the optical lens in Embodiment 7 of the present invention.

[0039] Figure 15 This is a schematic diagram of the optical lens in Embodiment 8 of the present invention.

[0040] Figure 16 This is the MTF curve of the optical lens in Embodiment 8 of the present invention.

[0041] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 9 of the present invention.

[0042] Figure 18 This is the MTF curve of the optical lens in Embodiment 9 of the present invention.

[0043] Figure 19 This is a schematic diagram of the optical lens in Embodiment 10 of the present invention.

[0044] Figure 20 This is the MTF curve of the optical lens in Embodiment 10 of the present invention.

[0045] Figure 21 This is a schematic diagram of the optical lens structure in Embodiment 11 of the present invention.

[0046] Figure 22 This is the MTF curve of the optical lens in Embodiment 11 of the present invention.

[0047] Figure 23 This is a schematic diagram of the optical lens structure in Embodiment 12 of the present invention.

[0048] Figure 24 This is the MTF curve of the optical lens in Embodiment 12 of the present invention.

[0049] Figure 25 This is a schematic diagram of the optical lens structure in Embodiment 13 of the present invention.

[0050] Figure 26 This is the MTF curve of the optical lens in Embodiment 13 of the present invention.

[0051] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0052] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this 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.

[0053] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0054] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0055] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0056] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0057] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] The optical lens provided in this embodiment of the invention is an infrared confocal lens with a total of seven lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0060] In some embodiments, the first lens may have negative optical power, its object-side surface may be concave or convex, and its image-side surface may be concave. The second lens may have positive optical power, its object-side surface may be concave or convex, and its image-side surface may be convex. The third lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be convex. The fourth lens may have negative optical power, its object-side surface may be concave or convex, and its image-side surface may be concave or convex. The fifth lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be concave or convex. The sixth lens may have negative optical power, its object-side surface may be convex near the optical axis, and its image-side surface may be concave. The seventh lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be convex.

[0061] In some embodiments, the optical lens may further include an aperture, which may be located between the fourth lens and the fifth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image. Additionally, when the aperture is located between the fourth lens and the fifth lens, the aperture can reasonably distribute the functions of the first lens to the seventh lens. For example, the first lens, the second lens, the third lens, and the fourth lens can be used to receive light to a large extent, and the fifth lens to the seventh lens can be used to correct aberrations, which is beneficial to balancing the structure of the entire optical system. Furthermore, when the aperture is located between the fourth lens and the fifth lens, it is convenient to correct the aperture aberration.

[0062] In some embodiments, the optical lens may further include a filter and a protective glass, which may be sequentially arranged along the optical axis between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the anti-shock and scratch-resistant capabilities of the optical lens, while having little impact on the imaging quality of the optical lens.

[0063] In some embodiments, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens, and the seventh lens satisfy: -1.8 < f1234 / f567 < -0.6. Meeting the above range, by reasonably setting the focal lengths of the lens groups before and after the aperture, it is beneficial to balance various aberrations generated by the lens group before the aperture and improve the overall imaging quality. More specifically, -1.64 < f1234 / f567 < -0.69.

[0064] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5 < TTL / f < 7.5. Meeting the above range can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens. More specifically, 6.11 < TTL / f < 7.03.

[0065] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.7 < TTL / IH < 3.8. Meeting the above range ensures that, with the same overall length of the lens, it has a larger image surface, can match a larger-sized imaging chip to achieve high-definition imaging, and can better achieve the balance between the small overall length and the large image surface of the lens. More specifically, 2.96 < TTL / IH < 3.5.

[0066] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 90°. Meeting the above range defines that the optical lens has a suitable field of view and aperture value, can collect light at large angles and obtain good imaging quality. More specifically, 72° < FOV / Fno < 87.79°.

[0067] In some embodiments, the true image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.2 < IH / EPD < 4.8. Meeting the above range can increase the width of the light beam entering the optical lens, improve the brightness at the image plane of the optical lens and avoid vignetting. More specifically, 3.54 < IH / EPD < 4.37.

[0068] In some embodiments, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 1.7 < IH / f < 2.3. Meeting the above range, controlling the image height and focal length of the optical lens within a reasonable range helps the optical lens to have the characteristic of a large image plane and improve the imaging quality. More specifically, 1.88 < IH / f < 2.2.

[0069] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.7 < BFL / f < 2.1. Meeting the above range defines that the optical lens has a suitable back focus, facilitates the reasonable arrangement of the positions of each lens, and at the same time reduces the processing and assembly difficulty. More specifically, 1.85 < BFL / f < 1.93.

[0070] In some embodiments, the clear aperture d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.19 < d1 / (IH / 2) / tan(FOV / 2) < 0.37. Meeting the above range can have a small front aperture while meeting the requirements of the optical lens having a large field of view and a large image plane.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.3 < f1 / f < -0.9; the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.8 < R2 / f < 1. Meeting the above range, by setting the first lens to have a negative refractive power and the image side surface to be concave, it is beneficial for the first lens to receive light at a larger angle and collect as much light as possible to enter the rear optical system, achieving a large field of view while increasing the light flux. More specifically, -1.22 < f1 / f < -0.97; 0.83 < R2 / f < 0.96.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.7 < f2 / f < 2.7; the image-side curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -1.9 < R4 / f < -1.1. Meeting the above ranges defines that the second lens has an appropriate positive optical power and a convex image side, which has the effect of converging light rays, reducing the height of peripheral light rays, and is beneficial to reducing the aperture of the rear lens. More specifically, 1.81 < f2 / f < 2.51; -1.74 < R4 / f < -1.15.

[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -150 < f3 / f < -9; the object-side curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -1.6 < R5 / f < -0.8; the image-side curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -1.95 < R6 / f < -0.95; the object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy: -14 < (R5 + R6) / (R5 - R6) < -5. Meeting the above ranges enables the third lens to have a negative optical power and a suitable surface shape, which has the effect of diverging light rays, can disperse the central light rays and marginal light rays of each field of view, and can correct the aberration generated by the front lens. More specifically, -143.73 < f3 / f < -0.83; -1.46 < R5 / f < -0.83; -1.82 < R6 / f < -1.02.

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.9 < f6 / f < -1.4; the object-side curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 13.5 < R11 / f < 40; the image-side curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.9 < R12 / f < 1.8; the object-side curvature radius R11 of the sixth lens and the image-side curvature radius R12 of the sixth lens satisfy: 0.7 < (R11 - R12) / (R11 + R12) < 1. Meeting the above ranges sets the sixth lens to have a negative refractive power, which is beneficial to increasing the degree of light divergence, increasing the area of light entering the imaging surface, achieving large-format imaging of the lens, and improving the imaging quality of the optical lens. More specifically, -2.65 < f6 / f < -1.54; 14.6 < R11 / f < 37.35; 0.93 < R12 / f < 1.63; 0.86 < (R11 - R12) / (R11 + R12) < 0.94.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 2.1; the radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 1 < R13 / f < 2.4; the radius of curvature R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: -5.2 < R14 / f < -1.4; the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: |(R13 + R14) / (R13 - R14)| < 0.7. Meeting the above ranges and setting the seventh lens to have positive refractive power and a suitable surface shape is conducive to light convergence, enabling the light trend to smoothly transition to the rear, reducing the height of the light incident on the rear, avoiding light energy loss caused by too large an angle between the main light ray of the large field of view and the imaging surface when the light reaches the imaging surface, facilitating the improvement of the illuminance of the edge field of view, and being conducive to achieving a short overall optical length. More specifically, 1.47 < f7 / f < 1.91; 1.08 < R13 / f < 2.22; -4.82 < R14 / f < -1.49; -0.6 < (R13 + R14) / (R13 - R14) < 0.2.

[0076] In some embodiments, the overall 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: 0.48 < ∑CT / TTL < 0.6. Meeting the above range can effectively compress the overall length of the optical lens and is conducive to the structural design and production process of the optical lens.

[0077] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the effective focal length f of the optical lens satisfy: 3.24 < ΣCT / f < 4.05. Meeting the above range can effectively correct the field curvature and distortion of the optical lens and improve the imaging quality of the optical lens.

[0078] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -18 < f4 / f < -2.3. Meeting the above range limits the fourth lens to have an appropriate negative optical power, diverging the light, making the light in the edge field of view show an upward trend, being conducive to the image point on the imaging surface moving away from the optical axis, being conducive to achieving the effect of matching with a large chip, obtaining a larger picture, effectively eliminating aberration, and improving the resolution ability of the optical lens. More specifically, -13.13 < f4 / f < -2.55.

[0079] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.3 < f5 / f < 2.5; the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < R9 / f < 2.7. Meeting the above ranges and setting the fifth lens to have a positive refractive power and a suitable surface shape is conducive to converging light while correcting the field curvature and distortion of the optical lens, and improving the imaging quality of the optical lens. More specifically, 1.45 < f5 / f < 2.33; 0.97 < R9 / f < 2.48.

[0080] In some embodiments, the optical lens satisfies the following conditional expressions: 4 mm < f < 4.1 mm; 1.9 mm < EPD < 2.3 mm; 23 mm < TTL < 30 mm; 1.7 < Fno < 2.1; 13° < CRA < 21°; 7 mm < BFL < 8 mm; 140° < FOV < 170°; 7 mm < IH < 9 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field angle of the optical lens, and IH represents the true image height corresponding to the maximum field angle of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as a large field angle, a large image plane, and a large aperture. More specifically, 4.01 mm < f < 4.04 mm; 1.95 mm < EPD < 2.25 mm; 24.65 mm < TTL < 28.3 mm; 1.79 < Fno < 2.06; 14.08° < CRA < 20.7°; 7.46 mm < BFL < 7.73 mm; 145° < FOV < 161°; 7.58 mm < IH < 8.82 mm.

[0081] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens of the present invention adopts a lens structure with a hybrid combination of seven glass and plastic lenses, which can improve the thermal stability performance. Specifically, the first lens and the fourth lens are made of glass lenses; the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce volume, and provide an optical lens product with higher cost performance.

[0082] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, in the optical lens provided by this invention, the second, third, fifth, sixth, and seventh lenses can be aspherical lenses, while the first and fourth lenses can be spherical lenses.

[0083] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0084]

[0085] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0086] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0087] Example 1

[0088] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0089] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0090] The second lens L2 has positive optical power, its object side S3 is concave, and its image side S4 is convex.

[0091] The third lens L3 has negative optical power, its object side S5 is concave, and its image side S6 is convex.

[0092] The fourth lens L4 has negative optical power, its object side S7 is convex, and its image side S8 is concave.

[0093] The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side S10 is convex.

[0094] The sixth lens L6 has negative optical power, its object side S11 is convex near the optical axis, and its image side S12 is concave.

[0095] The seventh lens L7 has positive optical power, its object side S13 is convex, and its image side S14 is convex.

[0096] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0097] The object side S17 and image side S18 of the protective glass G2 are both flat.

[0098] The imaging plane S19 is a plane.

[0099] The second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses; the first lens L1 and the fourth lens L4 are glass spherical lenses.

[0100] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0101] Table 1-1

[0102]

[0103]

[0104] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0105] Table 1-2

[0106] Face number K B C D E F S3 2.69E+01 -2.49E-03 -8.29E-05 9.58E-06 -8.88E-07 3.83E-08 S4 -7.22E-01 4.98E-04 -2.42E-04 2.68E-05 -1.57E-06 3.49E-08 S5 -3.22E+00 9.82E-04 -4.57E-04 3.81E-05 -1.86E-06 1.67E-08 S6 -4.57E+00 1.35E-03 -4.77E-04 3.17E-05 -1.24E-06 1.94E-08 S9 1.32E+00 3.58E-03 -7.93E-04 7.84E-05 -4.71E-06 9.02E-08 S10 -8.35E+00 -3.94E-03 3.21E-04 -3.50E-05 2.49E-06 -1.05E-07 S11 -1.44E+01 -4.13E-03 1.04E-04 2.23E-07 -7.05E-07 5.05E-08 S12 -5.16E+00 8.66E-04 -1.04E-04 -2.83E-06 6.78E-07 -2.14E-08 S13 -5.97E+00 1.35E-03 -6.21E-05 -7.28E-06 7.24E-07 -1.71E-08 S14 -4.76E-01 -2.06E-04 -1.77E-05 3.84E-06 -2.94E-07 9.93E-09

[0107] In this embodiment, the MTF curve of the optical lens 100 is as follows: Figure 2 As shown. Figure 2 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.45 throughout the entire field of view. Within the range of 0–160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0108] Example 2

[0109] Please see Figure 3 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S1 of the first lens L1 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0111] Table 2-1

[0112]

[0113] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0114] Table 2-2

[0115]

[0116]

[0117] In this embodiment, the MTF curve of the optical lens 200 is as follows: Figure 4 As shown. From Figure 4 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0118] Example 3

[0119] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S7 of the fourth lens L4 is concave; the image side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0120] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0121] Table 3-1

[0122]

[0123] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0124] Table 3-2

[0125]

[0126]

[0127] In this embodiment, the MTF curve of the optical lens 300 is as follows: Figure 6 As shown. From Figure 6 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0128] Example 4

[0129] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side surface S1 of the first lens L1 is concave; the object side surface S7 of the fourth lens L4 is concave; the image side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0130] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0131] Table 4-1

[0132]

[0133]

[0134] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0135] Table 4-2

[0136] Face number K B C D E F S3 4.12E+01 -4.56E-03 -2.47E-04 9.95E-06 2.15E-07 -5.89E-08 S4 -2.41E-01 5.01E-05 -1.15E-04 6.35E-06 -3.82E-07 7.63E-09 S5 -5.91E+00 5.89E-03 -4.16E-04 1.58E-05 -9.02E-07 2.06E-08 S6 -8.21E+00 2.93E-03 -4.39E-04 1.19E-05 -4.36E-08 -6.97E-09 S9 -3.73E-01 -1.76E-04 -1.79E-04 2.10E-05 -1.14E-06 1.89E-08 S10 1.76E+00 -4.15E-03 4.41E-04 -3.21E-05 1.65E-06 -5.11E-08 S11 -4.39E+01 -8.67E-03 3.13E-04 -1.07E-05 -2.07E-07 2.14E-08 S12 -3.21E+00 -3.70E-03 2.15E-04 -1.40E-06 -5.39E-07 1.48E-08 S13 -5.01E+00 4.12E-04 4.38E-05 4.87E-06 -3.37E-07 9.04E-09 S14 -3.56E-01 -4.90E-04 3.33E-05 6.40E-06 -3.31E-07 2.38E-08

[0137] In this embodiment, the MTF curve of the optical lens 400 is as follows: Figure 8 As shown. From Figure 8 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0138] Example 5

[0139] Please see Figure 9The diagram shows a schematic of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S1 of the first lens L1 is concave; the object-side surface S3 of the second lens L2 is convex; the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S10 of the fifth lens L5 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0140] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0141] Table 5-1

[0142]

[0143]

[0144] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0145] Table 5-2

[0146] Face number K B C D E F S3 1.58E+01 -5.17E-03 -3.62E-04 4.46E-07 1.14E-06 -9.68E-08 S4 -5.67E-01 2.77E-04 -3.03E-04 2.05E-05 -9.29E-07 1.20E-08 S5 -1.05E+01 6.95E-03 -3.02E-04 9.59E-06 -1.02E-07 -2.36E-08 S6 -4.26E+00 2.62E-03 -3.05E-04 8.09E-06 -3.24E-07 7.08E-09 S9 -4.67E-01 -1.82E-03 6.99E-05 1.44E-05 -1.60E-06 1.10E-07 S10 -3.21E+01 -7.48E-03 6.53E-04 -5.09E-05 5.61E-06 -2.93E-07 S11 -4.50E+01 -1.44E-02 4.45E-04 -1.10E-05 2.04E-06 -3.01E-07 S12 -7.83E+00 -4.34E-03 2.28E-04 9.74E-06 -2.11E-06 7.15E-08 S13 -1.48E+00 -1.68E-03 9.28E-05 1.15E-05 -7.72E-07 1.99E-08 S14 -7.01E-01 -5.52E-04 5.79E-05 1.37E-05 -1.05E-06 6.95E-08

[0147] In this embodiment, the MTF curve of the optical lens 500 is as follows: Figure 10 As shown. From Figure 10 As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0148] Example 6

[0149] Please see Figure 11 The figure shows a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object-side surface S3 of the second lens L2 is a convex surface; the object-side surface S7 of the fourth lens L4 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0150] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0151] Table 6-1

[0152]

[0153]

[0154] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0155] Table 6-2

[0156] Face number K B C D E F S3 -4.50E+01 -2.64E-03 -1.49E-04 1.12E-05 -1.07E-06 3.06E-08 S4 -2.45E-01 -2.99E-04 -2.52E-04 2.78E-05 -1.62E-06 3.35E-08 S5 -3.18E+00 1.07E-03 -4.19E-04 3.78E-05 -1.93E-06 3.07E-08 S6 -4.47E+00 1.75E-03 -4.46E-04 2.66E-05 -9.41E-07 1.43E-08 S9 1.18E+00 4.17E-03 -7.36E-04 6.99E-05 -3.86E-06 5.16E-08 S10 -1.82E+01 -3.11E-03 2.81E-04 -2.38E-05 1.08E-06 -3.67E-08 S11 -4.50E+01 -4.27E-03 1.91E-04 -4.59E-07 -2.08E-06 1.68E-07 S12 -5.18E+00 1.86E-03 -1.39E-04 -6.33E-06 1.06E-06 -3.33E-08 S13 -3.02E+00 1.26E-03 -6.74E-05 -8.93E-07 7.59E-07 -2.59E-08 S14 -2.04E+00 5.95E-04 2.49E-05 8.25E-06 -2.66E-07 2.99E-08

[0157] In this embodiment, the MTF curve of the optical lens 600 is as follows: Figure 12 As shown. From Figure 12 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0158] Example 7

[0159] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S1 of the first lens L1 is concave; the object-side surface S3 of the second lens L2 is convex; the object-side surface S7 of the fourth lens L4 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0160] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0161] Table 7-1

[0162]

[0163] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0164] Table 7-2

[0165]

[0166]

[0167] In this embodiment, the MTF curve of the optical lens 700 is as follows: Figure 14 As shown. From Figure 14 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0168] Example 8

[0169] Please see Figure 15 The figure shows a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S1 of the first lens L1 is concave; the object-side surface S3 of the second lens L2 is convex; the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0170] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0171] Table 8-1

[0172]

[0173] The surface profile parameters of the aspherical lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0174] Table 8-2

[0175] Face number K B C D E F S3 -2.51E+01 -3.75E-03 -3.13E-04 -5.86E-07 8.02E-07 -7.78E-08 S4 4.11E-01 -9.98E-05 -1.29E-04 5.15E-06 -2.26E-07 3.44E-10 S5 -5.29E+00 6.63E-03 -4.23E-04 1.85E-05 -8.28E-07 9.85E-09 S6 -7.65E+00 3.60E-03 -4.93E-04 1.13E-05 1.74E-07 -1.41E-08 S9 -3.44E-01 8.23E-05 -1.90E-04 2.30E-05 -1.27E-06 2.31E-08 S10 6.31E-02 -3.81E-03 3.82E-04 -2.98E-05 1.68E-06 -6.53E-08 S11 -4.50E+01 -8.79E-03 2.96E-04 -1.17E-05 -9.59E-08 9.12E-09 S12 -3.66E+00 -3.67E-03 1.93E-04 -1.41E-07 -5.86E-07 1.59E-08 S13 -4.33E+00 3.19E-04 4.55E-05 4.93E-06 -3.33E-07 8.86E-09 S14 -9.16E-01 -4.64E-04 3.91E-05 6.49E-06 -3.09E-07 2.34E-08

[0176] In this embodiment, the MTF curve of the optical lens 800 is as follows: Figure 16 As shown. From Figure 16 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0177] Example 9

[0178] Please see Figure 17 The figure shows a schematic diagram of the structure of the optical lens 900 provided in Embodiment 9 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object side surface S3 of the second lens L2 is a convex surface; the object side surface S7 of the fourth lens L4 is a concave surface; the image side surface S8 of the fourth lens L4 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0179] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9-1.

[0180] Table 9-1

[0181]

[0182]

[0183] The surface profile parameters of the aspherical lens of the optical lens 900 in Example 9 are shown in Table 9-2.

[0184] Table 9-2

[0185] Face number K B C D E F S3 -4.50E+01 -4.49E-03 -2.38E-04 -5.60E-06 1.40E-06 -7.87E-08 S4 -2.27E-01 4.64E-05 -1.37E-04 7.29E-06 -3.60E-07 8.95E-09 S5 -6.53E+00 6.51E-03 -2.86E-04 1.56E-05 -9.43E-07 3.26E-08 S6 -7.58E+00 3.01E-03 -3.43E-04 1.56E-05 -6.44E-07 2.41E-08 S9 -5.65E-02 7.38E-04 -1.85E-04 2.19E-05 -1.23E-06 3.51E-08 S10 -2.56E+00 -3.23E-03 3.45E-04 -2.49E-05 1.22E-06 -3.32E-08 S11 -4.51E+01 -6.82E-03 3.06E-04 -2.25E-05 8.09E-07 -2.49E-08 S12 -1.61E+00 -3.94E-03 8.93E-05 1.20E-07 -1.64E-07 2.87E-09 S13 -2.34E+00 -1.14E-03 -7.19E-06 6.17E-06 -1.79E-07 2.79E-09 S14 -2.27E+00 -6.96E-04 2.64E-05 3.69E-06 -2.05E-07 1.38E-08

[0186] In this embodiment, the MTF curve of the optical lens 900 is as follows: Figure 18 As shown. From Figure 18 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0187] Example 10

[0188] Please see Figure 19 The diagram shows a schematic of the structure of the optical lens 1000 provided in Embodiment 10 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S3 of the second lens L2 is convex; the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S10 of the fifth lens L5 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0189] The relevant parameters of each lens in the optical lens 1000 in Example 10 are shown in Table 10-1.

[0190] Table 10-1

[0191]

[0192]

[0193] The surface profile parameters of the aspherical lens of the optical lens 1000 in Example 10 are shown in Table 10-2.

[0194] Table 10-2

[0195] Face number K B C D E F S3 2.14E+01 -5.70E-03 -3.63E-04 -7.80E-06 2.62E-06 -1.74E-07 S4 -4.84E-01 8.40E-04 -2.73E-04 1.78E-05 -9.71E-07 2.19E-08 S5 -7.56E+00 7.26E-03 -2.11E-04 8.70E-06 -8.23E-07 3.40E-08 S6 -7.71E+00 1.75E-03 -2.16E-04 1.76E-05 -1.33E-06 4.90E-08 S9 -3.39E-01 -1.27E-03 -6.92E-05 2.20E-05 -1.58E-06 5.53E-08 S10 -2.90E+01 -7.08E-03 6.98E-04 -4.22E-05 2.41E-06 -1.27E-07 S11 -4.51E+01 -9.33E-03 3.90E-04 -2.07E-05 2.07E-07 -7.23E-08 S12 -9.54E-01 -3.91E-03 6.72E-05 -3.01E-06 1.56E-07 -7.67E-09 S13 -1.66E+00 -2.01E-03 3.07E-05 1.04E-05 -4.34E-07 8.94E-09 S14 -1.67E+00 -7.23E-04 4.34E-05 8.21E-06 -5.50E-07 3.69E-08

[0196] In this embodiment, the MTF curve of the optical lens 1000 is as follows: Figure 20 As shown. From Figure 20 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0197] Example 11

[0198] Please see Figure 21 The diagram shows a schematic of the structure of the optical lens 1100 provided in Embodiment 11 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S1 of the first lens L1 is concave; the object-side surface S3 of the second lens L2 is convex; the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; the image-side surface S10 of the fifth lens L5 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0199] The relevant parameters of each lens in the optical lens 1100 in Example 11 are shown in Table 11-1.

[0200] Table 11-1

[0201]

[0202] The surface profile parameters of the aspherical lens of the optical lens 1100 in Example 11 are shown in Table 11-2.

[0203] Table 11-2

[0204] Face number K B C D E F S3 4.70E+01 -4.95E-03 -3.32E-04 -9.53E-06 2.28E-06 -1.97E-07 S4 -5.53E-01 2.71E-04 -2.12E-04 1.61E-05 -1.20E-06 3.16E-08 S5 -7.88E+00 5.76E-03 -1.51E-04 1.28E-05 -1.60E-06 6.14E-08 S6 -7.52E+00 9.85E-04 -1.82E-04 1.32E-05 -1.30E-06 5.38E-08 S9 -3.08E-01 -1.68E-03 -5.37E-06 1.49E-05 -1.27E-06 6.02E-08 S10 -4.50E+01 -8.74E-03 8.12E-04 -4.79E-05 2.53E-06 -1.09E-07 S11 -4.50E+01 -1.08E-02 3.96E-04 -7.26E-06 -1.46E-06 8.46E-09 S12 -1.74E+00 -4.19E-03 1.41E-04 2.70E-07 -4.92E-07 1.27E-08 S13 -2.22E+00 -1.76E-03 1.09E-04 9.13E-06 -6.24E-07 1.50E-08 S14 -2.56E+00 -6.95E-04 4.41E-05 1.05E-05 -6.94E-07 4.74E-08

[0205] In this embodiment, the MTF curve of the optical lens 1100 is as follows: Figure 22 As shown. From Figure 22 As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0206] Example 12

[0207] Please see Figure 23 The figure shown is a schematic diagram of the structure of the optical lens 1200 provided in Embodiment 12 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S3 of the second lens L2 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0208] The relevant parameters of each lens in the optical lens 1200 in Example 12 are shown in Table 12-1.

[0209] Table 12-1

[0210]

[0211] The surface profile parameters of the aspherical lens of the optical lens 1200 in Example 12 are shown in Table 12-2.

[0212] Table 12-2

[0213]

[0214]

[0215] In this embodiment, the MTF curve of the optical lens 1200 is as follows: Figure 24 As shown. From Figure 24 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0216] Example 13

[0217] Please see Figure 25 The diagram shows a schematic of the structure of the optical lens 1300 provided in Embodiment 13 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object-side surface S1 of the first lens L1 is concave, the object-side surface S3 of the second lens L2 is convex, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0218] The relevant parameters of each lens in the optical lens 1300 in Example 13 are shown in Table 13-1.

[0219] Table 13-1

[0220]

[0221] The surface profile parameters of the aspherical lens of the optical lens 1300 in Example 13 are shown in Table 13-2.

[0222] Table 13-2

[0223] Face number K B C D E F S3 -4.49E+01 -4.47E-03 -3.16E-04 1.37E-05 1.23E-07 -7.46E-08 S4 -6.50E-01 -6.71E-04 -1.59E-04 4.59E-06 -1.61E-07 -3.58E-10 S5 -5.85E+00 6.24E-03 -3.43E-04 1.02E-05 -5.69E-07 3.48E-08 S6 -1.04E+01 3.70E-03 -3.56E-04 7.77E-06 -4.56E-08 1.06E-08 S9 -1.58E+00 3.38E-03 -4.52E-04 4.04E-05 -2.23E-06 2.55E-08 S10 -8.13E+00 -4.22E-03 2.45E-04 -1.69E-05 4.10E-07 -9.38E-09 S11 3.75E+01 -8.80E-03 4.66E-04 -3.10E-05 3.54E-07 7.04E-08 S12 -8.41E+00 -1.30E-03 1.26E-04 -1.22E-05 3.58E-07 3.46E-09 S13 -8.93E+00 2.48E-03 -6.74E-05 2.06E-06 5.02E-08 -4.28E-10 S14 -2.00E+00 -1.54E-04 3.31E-05 5.81E-06 -7.93E-08 4.77E-09

[0224] In this embodiment, the MTF curve of the optical lens 1300 is as follows: Figure 26 As shown. From Figure 26 As can be seen, the MTF value of this embodiment is above 0.48 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0225] Please refer to Tables 13-1 and 13-2 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0226] Table 13-1

[0227]

[0228]

[0229] Table 13-2

[0230]

[0231]

[0232] In summary, the optical lens provided by the present invention employs seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens. This allows the lens to achieve good infrared confocal effect while also possessing one or more advantages such as a large field of view, a large aperture, and miniaturization.

[0233] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0234] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, successively comprise: a first lens with negative refractive power, the image side surface of which is a concave surface; a second lens with positive refractive power, the image side surface of which is a convex surface; a third lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fourth lens with negative refractive power; a fifth lens with positive refractive power, the object side surface of which is a convex surface; a sixth lens with negative refractive power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface; a seventh lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; wherein the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: -1.8 < f1234 / f567 < -0.6; the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5 < TTL / f < 7.5; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.7 < TTL / IH < 3.

8.

2. The optical lens of claim 1, wherein, the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: -1.64 < f1234 / f567 < -0.69; the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.11 < TTL / f < 7.03; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.96 < TTL / IH < 3.

5.

3. The optical lens of claim 1, wherein, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 70° < FOV / Fno < 90°; the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.2 < IH / EPD < 4.

8.

4. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.7 < IH / f < 2.3; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 1.7 < BFL / f < 2.

1.

5. The optical lens of claim 1, wherein, the object side surface aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.19 < d1 / (IH / 2) / tan(FOV / 2) < 0.

37.

6. The optical lens of claim 1, wherein, An optical lens has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from an object side to an image side.

7. The optical lens of claim 1, wherein, An optical lens has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from an object side to an image side.

8. The optical lens of claim 1, wherein, An optical lens has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from an object side to an image side.

9. The optical lens of claim 1, wherein, An optical lens has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from an object side to an image side.

10. The optical lens of claim 1, wherein, An optical lens has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from an object side to an image side. An optical lens has a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from an object side to an image side.

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