Optical lens

Abstract

The invention relates to an optical lens which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the optical axis in the direction from the object side to the image side, a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with negative focal power and an eighth lens with negative focal power are included. The effective focal length F12 of the combination of the first lens and the second lens and the effective focal length F of the optical lens meet the following relation: F12 / F is more than or equal to 3.95 and less than or equal to 9.6. The optical lens at least has one of the characteristics of large field of view, miniaturization, large target surface, high resolution, low distortion and the like.

Description

Technical Field

[0001] The present invention relates to the field of imaging lens technology, and in particular to an optical lens having one of the characteristics of large field of view, miniaturization, large target surface, high resolution, and low distortion. Background Art

[0002] Video lenses are widely used in video conferencing, security monitoring, sports photography and other fields.

[0003] At the same time, with the development of information technology, video conferencing has become widely used in remote communication management of enterprises. In video conferencing, the imaging optical system used for video is a very important component, and the performance of the imaging optical system has a significant impact on the use effect of video conferencing.

[0004] The optical lenses on the market today still have the following shortcomings:

[0005] 1. The existing optical lenses are generally too small to meet the requirements of mainstream large-scale targets;

[0006] 2. It is difficult for existing optical lenses to maintain low distortion while ensuring high resolution;

[0007] 3. In order for existing optical lenses to achieve a large target area, low distortion and high resolution, it is generally necessary to increase the number of lenses to balance system performance. At this time, the lens may have problems such as being too long and too large in size.

[0008] Therefore, designing an optical lens with one of the characteristics of large field of view, low distortion, low cost, miniaturization, large target area, and high resolution has become a market development trend. Summary of the invention

[0009] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an optical lens having at least one of the characteristics of large field of view FOV>61°, optical distortion ≤|-2.6%|, low cost, miniaturization, large target surface, high resolution, etc.

[0010] To achieve the above-mentioned object, the present invention provides an optical lens, comprising, along the direction from the object side to the image side of the optical axis, a first lens having positive focal power, a second lens having negative focal power, a third lens having positive focal power, a fourth lens having positive focal power, a fifth lens having negative focal power, a sixth lens having positive focal power, a seventh lens having negative focal power and an eighth lens having negative focal power,

[0011] The effective focal length F12 of the combination of the first lens and the second lens and the effective focal length F of the optical lens satisfy the following relationship: 3.95≤F12 / F≤9.6.

[0012] According to a technical solution of the present invention, the first lens is a convex-convex lens, the second lens is a concave-convex lens, the third lens is a convex-concave lens, and the fourth lens is a convex-convex lens.

[0013] According to a technical solution of the present invention, the fifth lens is a convex-concave lens, the sixth lens is a convex-convex lens, the image side surface of the seventh lens is a concave surface, and the eighth lens is a concave-concave lens.

[0014] According to a technical solution of the present invention, the first lens and the second lens form a doublet lens.

[0015] According to a technical solution of the present invention, the first lens, the second lens, the third lens, the aperture, and the fourth lens form an internal focusing structure.

[0016] According to a technical solution of the present invention, the effective focal length F12 of the combination of the first lens and the second lens, the Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens satisfy the following relationship: 1≤F12 / (Vd1-Vd2)≤4.85.

[0017] According to a technical solution of the present invention, the effective focal length F1 of the first lens and the effective focal length F2 of the second lens satisfy the following relationship: -2≤F2 / F1≤-1.1.

[0018] According to a technical solution of the present invention, the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens satisfy the following relationship with the effective focal length F of the optical lens: 0.6≤(F / R31)+(F / R32)≤1.2.

[0019] According to a technical solution of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy the following relationship: 0.9≤F4 / F≤1.46.

[0020] According to a technical solution of the present invention, the curvature radius R51 of the object side surface and the curvature radius R52 of the image side surface of the fifth lens satisfy the following relationship with the effective focal length F5 of the fifth lens: -2.94≤F5 / (R51+R52)≤-1.68.

[0021] According to a technical solution of the present invention, the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy the following relationship: 0.8≤F6 / F≤1.15.

[0022] According to a technical solution of the present invention, the effective focal length F7 of the seventh lens and the effective focal length F6 of the sixth lens satisfy the following relationship: -2.5≤F7 / F6≤-1.8.

[0023] According to a technical solution of the present invention, a radius of curvature R72 of the image-side surface of the seventh lens and an effective focal length F7 of the seventh lens satisfy the following relationship: 0.4≤|R72 / F7|≤1.4.

[0024] According to a technical solution of the present invention, the maximum sag height SSAG_R82_max of the image side surface, the sag height SSAG_R82 of the optical effective diameter position of the image side surface and the sag height SSAG_R81 of the optical effective diameter position of the object side surface of the eighth lens satisfy the following relationship: -0.4≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.17.

[0025] According to a technical solution of the present invention, a curvature radius R81 of the object-side surface and a curvature radius R82 of the image-side surface of the eighth lens satisfy the following relationship: 0.88≤|R81 / R82|≤2.9.

[0026] According to a technical solution of the present invention, the effective focal length F78 of the combination of the seventh lens and the eighth lens and the effective focal length F of the optical lens satisfy the following relationship: -2.2≤F / F78≤-1.8.

[0027] According to a technical solution of the present invention, the effective focal length F7 of the seventh lens, half H of the diagonal length of the imaging chip of the optical lens and the effective focal length F of the optical lens satisfy the following relationship: -18≤F7*H / F≤-14.7.

[0028] According to a technical solution of the present invention, the combined effective focal length Fa of the first lens to the fourth lens, the combined effective focal length Fb of the fifth lens to the eighth lens and the effective focal length F of the optical lens satisfy the following relationship: 1.79≤(Fa-Fb) / F≤2.31.

[0029] According to a technical solution of the present invention, the total optical length TTL of the optical lens, the effective focal length F and half the diagonal length H of the imaging chip of the optical lens satisfy the following relationship: 13≤TTL*H / F≤13.62.

[0030] According to a technical solution of the present invention, the optical lens satisfies at least one of the following conditions:

[0031] 3.95≤F12 / F≤8.7,

[0032] 1.1≤F12 / (Vd1-Vd2)≤4.25,

[0033] -1.9≤F2 / F1≤-1.2,

[0034] 0.68≤(F / R31)+(F / R32)≤0.95,

[0035] 1≤F4 / F≤1.42,

[0036] -2.8≤F5 / (R51+R52)≤-2.0,

[0037] 0.85≤F6 / F≤1.05,

[0038] -2.4≤F7 / F6≤-1.9,

[0039] 0.5≤|R72 / F7|≤1.3,

[0040] -0.3≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.17,

[0041] 1≤|R81 / R82|≤2.7,

[0042] -2.15≤F / F78≤-1.85,

[0043] -17.6≤F7*H / F≤-15.2,

[0044] 1.85≤(Fa-Fb) / F≤2.26,

[0045] 13≤TTL*H / F≤13.6,

[0046] Wherein, F12 is the effective focal length of the combination of the first lens and the second lens, F is the effective focal length of the optical lens, Vd1 is the Abbe number of the first lens, Vd2 is the Abbe number of the second lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, R31 is the radius of curvature of the object side of the third lens, R32 is the radius of curvature of the image side of the third lens, F4 is the effective focal length of the fourth lens, R51 is the radius of curvature of the object side of the fifth lens, R52 is the radius of curvature of the image side of the fifth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, and R72 is the effective focal length of the seventh lens. The radius of curvature of the image side surface of the lens, SSAG_R82_max is the maximum sag of the image side surface of the eighth lens, SSAG_R82 is the sag of the optical effective diameter position of the image side surface of the eighth lens, SSAG_R81 is the sag of the optical effective diameter position of the object side surface of the eighth lens, R81 is the radius of curvature of the object side surface of the eighth lens, R82 is the radius of curvature of the image side surface of the eighth lens, F78 is the effective focal length of the seventh lens and the eighth lens combined, H is half of the diagonal length of the imaging chip of the optical lens, Fa is the combined effective focal length of the first lens to the fourth lens, Fb is the combined effective focal length of the fifth lens to the eighth lens, and TTL is the total optical length of the optical lens.

[0047] According to the solution of the present invention, by setting the optical lens to include eight lenses, and setting the optical powers of the first lens to the eighth lens to be positive power, negative power, positive power, positive power, negative power, positive power, negative power, negative power, respectively, the optical lens has at least one of the characteristics of large field of view FOV>61°, low distortion (optical distortion ≤|-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels). BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 Schematic diagram of the structure of the optical lens of the first embodiment of the present invention;

[0050] Figure 2Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 1 of the present invention;

[0051] Figure 3 Schematic diagram of the structure of the optical lens of the second embodiment of the present invention;

[0052] Figure 4 Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 2 of the present invention;

[0053] Figure 5 Schematic diagram of the structure of the optical lens of Embodiment 3 of the present invention;

[0054] Figure 6 Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 3 of the present invention;

[0055] Figure 7 Schematic diagram of the structure of an optical lens according to Embodiment 4 of the present invention;

[0056] Figure 8 Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 4 of the present invention. DETAILED DESCRIPTION

[0057] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to 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.

[0058] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0059] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0060] 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 is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0061] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0062] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0063] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following examples only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the protection scope of the present application.

[0064] like Figures 1 to 8 As shown, an embodiment of the present invention provides an optical lens, which includes, in order from the object side to the image side of the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a protective flat glass CG, wherein the first lens L1 and the second lens L2 are spherical lenses, and the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses.

[0065] The first lens L1 is a convex-convex lens with positive power, and the second lens L2 is a concave-convex lens with negative power. The first lens L1 and the second lens L2 are glued together, which is beneficial to correcting chromatic aberration, improving color reproduction, and improving the resolution quality of the lens; at the same time, it is beneficial to reduce tolerance sensitivity and improve the lens assembly yield.

[0066] The third lens L3 is a convex-concave lens with positive refractive power, which is beneficial for correcting astigmatism.

[0067] The fourth lens L4 is a convex-convex lens with positive optical power, which can compensate for the aberrations produced by the front lens group (lenses before the aperture, i.e., the first lens L1 to the third lens L3) and reduce the aberration correction pressure of the rear lens group (lenses after the aperture, i.e., the fourth lens L4 to the eighth lens L8).

[0068] The fifth lens L5 is a convex-concave lens with negative optical power, which is beneficial for correcting distortion; at the same time, it effectively and smoothly raises the light, which is beneficial for correcting marginal aberrations in the rear group.

[0069] The sixth lens L6 is a convex-convex lens with positive refractive power, which is beneficial for correcting field curvature.

[0070] The image side surface of the seventh lens L7 is concave and has negative optical power, which is beneficial for correcting marginal aberrations.

[0071] The eighth lens L8 is a concave-concave lens with negative optical power, which is beneficial for correcting distortion and residual aberration; at the same time, the surface of the eighth lens L8 is aspherical, which is beneficial for effectively matching the chip size and large CRA, and helps to achieve a large target surface.

[0072] The first lens L1, the second lens L2, the third lens L3, the aperture STO, and the fourth lens L4 form an internal focusing structure, that is, the first lens L1, the second lens L2, the third lens L3, the aperture STO, and the fourth lens L4 are used as a focusing group, and the focusing group is moved to achieve the focus of the scene at an object distance of 1m to Inf.

[0073] In some embodiments of the present invention, the combined effective focal length F12 of the first lens L1 and the second lens L2 satisfies the following relationship with the effective focal length F of the optical lens: 3.95≤F12 / F≤9.6, preferably, 3.95≤F12 / F≤8.7. By reasonably controlling the ratio of the combined effective focal length of the first lens and the second lens to the total effective focal length of the optical lens, the incident light with a large field of view angle can be effectively controlled to enter the optical system, which can effectively expand the field of view angle. At the same time, the trend of the light can also be effectively controlled, so that the light with a large field of view angle smoothly transitions to the rear, which is beneficial to reduce the generation of various aberrations and correct the spherical aberration of the system, and helps to achieve high resolution.

[0074] In some embodiments of the present invention, the effective focal length F12 of the combination of the first lens L1 and the second lens L2, the Abbe number Vd1 of the first lens L1 and the Abbe number Vd2 of the second lens L2 satisfy the following relationship: 1≤F12 / (Vd1-Vd2)≤4.85, preferably, 1.1≤F12 / (Vd1-Vd2)≤4.25. Reasonable allocation of the ratio of the difference in the Abbe numbers of the first lens L1 and the second lens L2 to the effective focal length of the combination of the first lens L1 and the second lens L2 is conducive to correcting system chromatic aberration, improving color restoration, and improving the performance quality of the lens.

[0075] In some embodiments of the present invention, the effective focal length F1 of the first lens L1 and the effective focal length F2 of the second lens L2 satisfy the following relationship: -2≤F2 / F1≤-1.1, preferably, -1.9≤F2 / F1≤-1.2. Reasonable control of the ratio of the positive and negative effective focal lengths of the first lens L1 and the second lens L2 is conducive to the smooth transition of light, the correction of chromatic aberration, and the effective reduction of tolerance sensitivity, which is conducive to the improvement of lens assembly yield.

[0076] In some embodiments of the present invention, the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens L3 and the effective focal length F of the optical lens satisfy the following relationship: 0.6≤(F / R31)+(F / R32)≤1.2, preferably, 0.68≤(F / R31)+(F / R32)≤0.95. Reasonable configuration of the ratio of the curvature radius of the object side surface and the image side surface of the third lens L3 to the total effective focal length of the optical lens is conducive to correcting astigmatism and improving the resolution of the optical system.

[0077] In some embodiments of the present invention, the effective focal length F4 of the fourth lens L4 and the effective focal length F of the optical lens satisfy the following relationship: 0.9≤F4 / F≤1.46, preferably, 1≤F4 / F≤1.42. Reasonable control of the ratio of the fourth lens L4 to the total effective focal length of the optical system is conducive to correcting the spherical aberration of the system and improving the resolution of the lens.

[0078] In some embodiments of the present invention, the curvature radius R51 of the object side surface and the curvature radius R52 of the image side surface of the fifth lens L5 and the effective focal length F5 of the fifth lens L5 satisfy the following relationship: -2.94≤F5 / (R51+R52)≤-1.68, preferably, -2.8≤F5 / (R51+R52)≤-2.0. Reasonable control of the ratio of the effective focal length of the fifth lens L5 to the sum of the curvature radii of the object side surface and the image side surface of the fifth lens L5 is conducive to better reducing the optical distortion of the lens, achieving low distortion, and controlling the absolute value of the optical distortion within 2.6%.

[0079] In some embodiments of the present invention, the effective focal length F6 of the sixth lens L6 and the effective focal length F of the optical lens satisfy the following relationship: 0.8≤F6 / F≤1.15, preferably, 0.85≤F6 / F≤1.05. Controlling the ratio range of the effective focal length of the sixth lens L6 and the total effective focal length of the optical system is beneficial to correcting the field curvature of the optical system and improving the resolution performance of the lens.

[0080] In some embodiments of the present invention, the effective focal length F7 of the seventh lens L7 and the effective focal length F6 of the sixth lens L6 satisfy the following relationship: -2.5≤F7 / F6≤-1.8, preferably, -2.4≤F7 / F6≤-1.9. Reasonable control of the ratio of the effective focal lengths of the sixth lens L6 and the seventh lens L7 is conducive to correcting the high and low temperature back focus offset of the system, and helps to achieve the optical system without out-of-focus in high and low temperature environments of -20°C to +60°C.

[0081] In some embodiments of the present invention, the curvature radius R72 of the image side surface of the seventh lens L7 and the effective focal length F7 of the seventh lens L7 satisfy the following relationship: 0.4≤|R72 / F7|≤1.4, preferably, 0.5≤|R72 / F7|≤1.3. Controlling the ratio of the curvature radius of the image side surface of the seventh lens L7 to the effective focal length of the seventh lens L7 is beneficial to correcting edge aberrations; at the same time, the edge light is slowly lifted, which is beneficial to achieving a large target surface.

[0082] In some embodiments of the present invention, the maximum sag height SSAG_R82_max of the image side surface, the sag height SSAG_R82 of the optical effective diameter position of the image side surface, and the sag height SSAG_R81 of the optical effective diameter position of the object side surface of the eighth lens L8 satisfy the following relationship: -0.4≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.17, preferably, -0.3≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.17. Reasonable control of the sag heights of the object side surface and the image side surface of the eighth lens L8 is conducive to correcting optical distortion, achieving low distortion, and controlling the absolute value of optical distortion within 2.6%.

[0083] In some embodiments of the present invention, the curvature radius R81 of the object side surface and the curvature radius R82 of the image side surface of the eighth lens L8 satisfy the following relationship: 0.88≤|R81 / R82|≤2.9, preferably, 1≤|R81 / R82|≤2.7. Reasonable control of the ratio of the curvature radius of the object side surface and the image side surface of the eighth lens L8 is conducive to better correction of distortion, achieving low distortion, and controlling the absolute value of optical distortion within 2.6%.

[0084] In some embodiments of the present invention, the combined effective focal length F78 of the seventh lens L7 and the eighth lens L8 satisfies the following relationship with the effective focal length F of the optical lens: -2.2≤F / F78≤-1.8, preferably, -2.15≤F / F78≤-1.85. The ratio of the combined focal length of the seventh lens L7 and the eighth lens L8 to the effective focal length of the system is controlled to smoothly transmit light and improve the relative illumination of the system.

[0085] In some embodiments of the present invention, the effective focal length F7 of the seventh lens L7, half the diagonal length H of the imaging chip of the optical lens, and the effective focal length F of the optical lens satisfy the following relationship: -18≤F7*H / F≤-14.7, preferably, -17.6≤F7*H / F≤-15.2. Reasonable control of the effective focal length of the seventh lens L7 to lift the light is conducive to effectively matching the chip size and large CRA, and helping to achieve a large target surface.

[0086] In some embodiments of the present invention, the combined effective focal length Fa of the first lens L1 to the fourth lens L4, the combined effective focal length Fb of the fifth lens L5 to the eighth lens L8 and the effective focal length F of the optical lens satisfy the following relationship: 1.79≤(Fa-Fb) / F≤2.31, preferably, 1.85≤(Fa-Fb) / F≤2.26. Reasonable control of the combined effective focal length of the first lens L1 to the fourth lens L4 and the combined effective focal length of the fifth lens L5 to the eighth lens L8 is conducive to balancing various aberrations of the system and improving the resolution of the lens; at the same time, when the lens is focused, the lens can achieve clear focus on the scene at an object distance of 1m to Inf, so that the lens resolution meets the requirements of high resolution, and the resolution can reach up to 50 million pixels.

[0087] In some embodiments of the present invention, the total optical length TTL of the optical lens, the effective focal length F and half the diagonal length H of the imaging chip of the optical lens satisfy the following relationship: 13≤TTL*H / F≤13.62, preferably, 13≤TTL*H / F≤13.6. Reasonable setting of the focal length, half image height and total system length can meet the requirements of compatible monitoring angles corresponding to different chips. When the half image height and a certain system focal length value are determined, the total optical length of the system can be reasonably controlled to make the total optical length of the system smaller, which is conducive to realizing a small lens volume.

[0088] Four groups of specific implementations are given below according to the above-mentioned configuration of the present invention to specifically illustrate the optical lens according to the present invention. The optical lens according to the present invention has a total of eight lenses, and each cemented surface of the cemented lens is recorded as a surface, plus the aperture STO, the protective glass CG and the image surface IMA, a total of 19 surfaces. Among them, the aperture STO is set between the third lens L3 and the fourth lens L4. For the convenience of description, each lens surface, the aperture STO and the protective glass CG are numbered S1, S2 to S18. And the aspheric surface satisfies the following formula:

[0089]

[0090] In the above formula, z is the axial distance from the surface to the vertex at a height y perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the cone coefficient; A4, A6, A8, A 10 , A 12 , A 14 , A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0091] Four sets of example data are shown in Table 1 below:

[0092]

[0093]

[0094] Table 1

[0095] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0096] Embodiment 1

[0097] Figure 1 Schematic diagram of the structure of the optical lens of the first embodiment of the present invention;

[0098] Figure 2 FIG. 1 is a schematic diagram of the F-Tan (theta) distortion of the optical lens of Example 1 of the present invention.

[0099] In Embodiment 1, the first lens L1 is a convex-convex lens with positive power, the second lens L2 is a concave-convex lens with negative power, the third lens L3 is a convex-concave lens with positive power, the fourth lens L4 is a convex-convex lens with positive power, the fifth lens L5 is a convex-concave lens with negative power, the sixth lens L6 is a convex-convex lens with positive power, the seventh lens L7 is a concave-concave lens with negative power, and the eighth lens L8 is a concave-concave lens with negative power.

[0100] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses; and the stop STO is disposed between the third lens L3 and the fourth lens L4.

[0101] Table 2 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0102]

[0103]

[0104] Table 2

[0105] Table 3 lists the aspheric coefficients of the aspheric lenses of the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , Fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0106] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S4 -56.13 -4.88E-04 -3.39E-05 1.13E-06 -7.75E-09 0.00E+00 0.00E+00 0.00E+00 S5 90.00 -1.54E-03 -6.36E-06 1.60E-06 -3.36E-08 0.00E+00 0.00E+00 0.00E+00 S7 6.76 -7.28E-04 -5.69E-05 1.60E-06 5.55E-08 -8.78E-09 0.00E+00 0.00E+00 S8 -27.08 -1.91E-03 1.51E-05 -1.26E-06 7.93E-08 -5.92E-09 0.00E+00 0.00E+00 S9 1.03 -2.02E-03 -3.29E-06 2.54E-06 -1.48E-07 2.16E-09 0.00E+00 0.00E+00 S10 0.47 -3.00E-03 4.56E-05 -1.94E-06 6.37E-09 -9.59E-10 0.00E+00 0.00E+00 S11 70.88 -1.41E-03 3.70E-05 -1.87E-06 1.06E-07 -1.06E-09 0.00E+00 0.00E+00 S12 -0.18 -4.46E-04 2.00E-05 -9.41E-08 3.27E-08 3.10E-10 0.00E+00 0.00E+00 S13 73.21 2.81E-04 -7.75E-05 3.54E-06 -4.49E-08 -1.08E-09 0.00E+00 0.00E+00 S14 19.30 4.94E-04 -1.04E-04 4.48E-06 -1.07E-07 9.72E-10 0.00E+00 0.00E+00 S15 0.54 -2.71E-03 1.08E-04 -3.36E-06 7.25E-08 -4.94E-10 0.00E+00 0.00E+00 S16 -17.32 -9.99E-04 2.20E-05 -3.48E-07 1.16E-09 1.81E-11 0.00E+00 0.00E+00

[0107] Table 3

[0108] Combination Figure 1 , Figure 2 As shown in Tables 1 to 3 above, in Example 1, the effective focal length F of the optical lens is 13.93, the field of view FOV is 61.74°, and the optical distortion is -2.53%.

[0109] The first embodiment of the present invention is an optical lens having at least one of the following characteristics: large field of view FOV>61°, low distortion (optical distortion ≤|-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0110] Embodiment 2

[0111] Figure 3 Schematic diagram of the structure of the optical lens of the second embodiment of the present invention;

[0112] Figure 4 Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 2 of the present invention.

[0113] In the second embodiment, the first lens L1 is a convex-convex lens with positive power, the second lens L2 is a concave-convex lens with negative power, the third lens L3 is a convex-concave lens with positive power, the fourth lens L4 is a convex-convex lens with positive power, the fifth lens L5 is a convex-concave lens with negative power, the sixth lens L6 is a convex-convex lens with positive power, the seventh lens L7 is a concave-concave lens with negative power, and the eighth lens L8 is a concave-concave lens with negative power.

[0114] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses; and the stop STO is disposed between the third lens L3 and the fourth lens L4.

[0115] Table 4 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0116] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 56.316 2.293 1.50 80.84 S2 Spherical -16.039 0.600 1.57 44.26 S3 Spherical -148.041 0.142 S4 Aspheric 33.463 2.479 1.54 55.71 S5 Aspheric 35.044 1.129 S6(STO) Spherical Infinity 0.900 S7 Aspheric 13.058 1.977 1.50 80.99 S8 Aspheric -15.041 0.855 S9 Aspheric 8.882 1.290 1.64 23.53 S10 Aspheric 6.308 1.533 S11 Aspheric 30.170 2.134 1.54 53.29 S12 Aspheric -9.821 0.100 S13 Aspheric -76.216 1.356 1.60 29.58 S14 Aspheric 20.904 2.877 S15 Aspheric -13.042 1.902 1.54 51.28 S16 Aspheric 11.142 0.808 S17 Spherical Infinity 0.300 1.52 64.20 S18 Spherical Infinity 0.200 IMA Spherical Infinity 0.000

[0117] Table 4

[0118] Table 5 lists the aspheric coefficients of the aspheric lenses of the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , Fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0119] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S4 -90.00 -6.01E-04 -1.40E-05 7.55E-07 -7.14E-09 0.00E+00 0.00E+00 0.00E+00 S5 52.05 -1.29E-03 4.10E-06 1.23E-06 -3.05E-08 0.00E+00 0.00E+00 0.00E+00 S7 -0.98 -2.34E-04 -1.44E-05 1.15E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 1.02 -4.58E-05 -2.51E-05 1.08E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S9 0.90 -1.57E-03 2.13E-05 -1.54E-06 5.94E-08 -2.15E-09 0.00E+00 0.00E+00 S10 0.64 -2.59E-03 4.16E-05 -3.61E-06 7.56E-08 -2.64E-09 0.00E+00 0.00E+00 S11 -22.58 -1.49E-03 -1.23E-06 -7.11E-07 1.78E-08 3.22E-09 0.00E+00 0.00E+00 S12 0.71 -8.77E-04 2.30E-05 -3.14E-07 4.10E-09 1.78E-09 0.00E+00 0.00E+00 S13 90.00 2.09E-04 -4.71E-05 2.66E-06 -3.69E-08 -8.81E-10 0.00E+00 0.00E+00 S14 10.68 4.98E-04 -8.33E-05 2.97E-06 -5.34E-08 1.62E-10 0.00E+00 0.00E+00 S15 3.43 -2.12E-03 9.12E-05 -3.26E-06 7.46E-08 -5.46E-10 0.00E+00 0.00E+00 S16 -20.52 -8.54E-04 2.24E-05 -4.97E-07 4.72E-09 -1.13E-11 0.00E+00 0.00E+00

[0120] Table 5

[0121] Combination Figure 3 , Figure 4 As shown in Table 1, Table 4 and Table 5 above, combined Figure 1 and Figure 2 As shown in Tables 1 to 3 above, in Example 2, the effective focal length F of the optical lens is 13.86, the field of view FOV is 61.11°, and the optical distortion is -0.75%.

[0122] The second embodiment of the present invention is an optical lens having at least one of the following characteristics: large field of view FOV>61°, low distortion (optical distortion ≤|-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0123] Embodiment 3

[0124] Figure 5 Schematic diagram of the structure of the optical lens of Embodiment 3 of the present invention;

[0125] Figure 6 Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 3 of the present invention.

[0126] In embodiment 3, the first lens L1 is a convex-convex lens with positive power, the second lens L2 is a concave-convex lens with negative power, the third lens L3 is a convex-concave lens with positive power, the fourth lens L4 is a convex-convex lens with positive power, the fifth lens L5 is a convex-concave lens with negative power, the sixth lens L6 is a convex-convex lens with positive power, the seventh lens L7 is a convex-concave lens with negative power, and the eighth lens L8 is a concave-concave lens with negative power.

[0127] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses; and the stop STO is disposed between the third lens L3 and the fourth lens L4.

[0128] Table 6 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0129] Surface serial number Surface type Curvature radius R Thickness d Refractive index Nd Abbe number Vd S1 Spherical 28.020 2.019 1.50 81.61 S2 Spherical -32.872 0.603 1.85 23.78 S3 Spherical -102.473 0.548 S4 Aspheric 27.641 1.297 1.64 23.53 S5 Aspheric 38.938 1.201 S6(STO) Spherical Infinity 0.901 S7 Aspheric 49.668 1.752 1.54 55.71 S8 Aspheric -12.161 0.868 S9 Aspheric 9.286 1.149 1.64 23.53 S10 Aspheric 6.145 1.044 S11 Aspheric 36.390 2.673 1.54 55.71 S12 Aspheric -8.020 0.100 S13 Aspheric 80.920 1.800 1.64 23.53 S14 Aspheric 15.340 2.827 S15 Aspheric -21.357 1.932 1.54 55.71 S16 Aspheric 8.185 0.978 S17 Spherical Infinity 0.300 1.52 64.20 S18 Spherical Infinity 0.200 IMA Spherical Infinity 0.000

[0130] Table 6

[0131] Table 7 lists the aspheric coefficients of the aspheric lenses of the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , Fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0132]

[0133]

[0134] Table 7

[0135] Combination Figure 5 , Figure 6 As shown in Tables 1, 6 and 7 above, in Example 3, the effective focal length F of the optical lens is 13.89, the field of view FOV is 61.52°, and the optical distortion is -1.67%.

[0136] The third embodiment of the present invention is an optical lens having at least one of the following characteristics: large field of view FOV>61°, low distortion (optical distortion ≤|-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0137] Embodiment 4

[0138] Figure 7 Schematic diagram of the structure of an optical lens according to Embodiment 4 of the present invention;

[0139] Figure 8 Schematic diagram of F-Tan (theta) distortion of the optical lens of Example 4 of the present invention.

[0140] In embodiment 4, the first lens L1 is a convex-convex lens with positive power, the second lens L2 is a concave-convex lens with negative power, the third lens L3 is a convex-concave lens with positive power, the fourth lens L4 is a convex-convex lens with positive power, the fifth lens L5 is a convex-concave lens with negative power, the sixth lens L6 is a convex-convex lens with positive power, the seventh lens L7 is a concave-concave lens with negative power, and the eighth lens L8 is a concave-concave lens with negative power.

[0141] The third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are aspherical lenses; and the stop STO is disposed between the third lens L3 and the fourth lens L4.

[0142] Table 8 lists the relevant parameters of each lens in the optical lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0143]

[0144]

[0145] Table 8

[0146] Table 9 lists the aspheric coefficients of the aspheric lenses of the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , Fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0147] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S4 -55.23 -5.09E-04 -2.32E-05 7.10E-07 -4.18E-09 -7.50E-12 0.00E+00 0.00E+00 S5 90.00 -1.36E-03 -2.48E-06 1.53E-06 -4.91E-08 6.69E-10 0.00E+00 0.00E+00 S7 20.14 -7.44E-04 -5.43E-05 5.85E-06 -7.47E-07 5.35E-08 -1.81E-09 0.00E+00 S8 -29.01 -1.78E-03 2.14E-05 -6.03E-07 -1.64E-07 1.49E-08 -6.06E-10 0.00E+00 S9 1.86 -1.37E-03 3.56E-06 8.34E-07 -7.19E-08 2.05E-09 -4.72E-11 0.00E+00 S10 0.51 -2.00E-03 4.25E-05 -2.74E-06 1.12E-07 -4.01E-09 4.91E-11 0.00E+00 S11 21.23 -1.25E-03 3.63E-05 -1.42E-06 -3.15E-08 4.34E-09 -5.60E-11 0.00E+00 S12 -0.72 -1.00E-04 -5.55E-06 -3.05E-07 3.64E-08 -3.61E-10 3.20E-11 0.00E+00 S13 33.25 6.94E-04 -9.45E-05 2.53E-06 -1.59E-08 1.77E-10 -2.71E-11 0.00E+00 S14 0.57 7.93E-04 -9.79E-05 3.45E-06 -6.57E-08 4.52E-10 1.50E-12 0.00E+00 S15 1.62 -2.68E-03 9.94E-05 -2.59E-06 5.38E-08 -4.12E-10 -4.65E-13 0.00E+00 S16 -14.78 -9.76E-04 1.74E-05 -1.19E-07 -5.87E-09 1.39E-10 -7.87E-13 0.00E+00

[0148] Table 9

[0149] Combination Figure 7 , Figure 8 As shown in Tables 1, 8 and 9 above, in Example 4, the effective focal length F of the optical lens is 13.97, the field of view FOV is 61.52°, and the optical distortion is -2.26%.

[0150] The fourth embodiment of the present invention is an optical lens having at least one of the following characteristics: large field of view FOV>61°, low distortion (optical distortion ≤|-2.6%|), low cost, miniaturization (TTL<23mm), large target surface (imaging surface diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0151] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical lens that has three lenses along the optical axis from the object side to the image side. include: A first lens (L1) with positive focal power, a second lens (L2) with negative focal power, a third lens (L3) with positive focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power, a seventh lens (L7) with negative focal power, and an eighth lens (L8) with negative focal power, characterized in that: The effective focal length F12 of the combination of the first lens (L1) and the second lens (L2) and the effective focal length F of the optical lens satisfy the following relationship: 3.95≤F12 / F≤9.

6.

2. The optical lens according to claim 1, It is characterized in that The first lens (L1) is a convex-convex lens, the second lens (L2) is a concave-convex lens, the third lens (L3) is a convex-concave lens, and the fourth lens (L4) is a convex-convex lens; The fifth lens (L5) is a convex-concave lens, the sixth lens (L6) is a convex-convex lens, the image side surface of the seventh lens (L7) is a concave surface, and the eighth lens (L8) is a concave-concave lens.

3. The optical lens according to claim 1, It is characterized in that The first lens (L1) and the second lens (L2) form a doublet lens.

4. The optical lens according to claim 1, It is characterized in that The first lens (L1), the second lens (L2), the third lens (L3), the stop (STO), and the fourth lens (L4) form a fixed focus structure or an internal focus structure.

5. The optical lens according to any one of claims 1 to 4, It is characterized in that The combined effective focal length F12 of the first lens (L1) and the second lens (L2), the Abbe number Vd1 of the first lens (L1) and the Abbe number Vd2 of the second lens (L2) satisfy the following relationship: 1≤F12 / (Vd1-Vd2)≤4.

85.

6. The optical lens according to any one of claims 1 to 4, It is characterized in that The effective focal length F1 of the first lens (L1) and the effective focal length F2 of the second lens (L2) satisfy the following relationship: -2≤F2 / F1≤-1.

1.

7. The optical lens according to any one of claims 1 to 4, It is characterized in that The curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens (L3) satisfy the following relationship with the effective focal length F of the optical lens: 0.6≤(F / R31)+(F / R32)≤1.

2.

8. The optical lens according to any one of claims 1 to 4, It is characterized in that The effective focal length F4 of the fourth lens (L4) and the effective focal length F of the optical lens satisfy the following relationship: 0.9≤F4 / F≤1.

46.

9. The optical lens according to any one of claims 1 to 4, It is characterized in that The curvature radius R51 of the object side surface and the curvature radius R52 of the image side surface of the fifth lens (L5) and the effective focal length F5 of the fifth lens (L5) satisfy the following relationship: -2.94≤F5 / (R51+R52)≤-1.

68.

10. The optical lens according to any one of claims 1 to 4, It is characterized in that The effective focal length F6 of the sixth lens (L6) and the effective focal length F of the optical lens satisfy the following relationship: 0.8≤F6 / F≤1.15.

Images