Optical lens

Abstract

This invention relates to an optical lens, comprising, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power. The effective focal length F12 of the combination of the first and second lenses satisfies the following relationship with the effective focal length F of the optical lens: 3.95 ≤ F12 / F ≤ 9.6. The optical lens of this invention possesses at least one of the following characteristics: large field of view, miniaturization, large target surface, high resolution, and low distortion.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and in particular to an optical lens that has one of the following characteristics: large field of view, miniaturization, large target surface, high resolution, and low distortion. Background Technology

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

[0003] Meanwhile, with the development of information technology, video conferencing has become widely used in remote communication management within enterprises. In video conferencing, the imaging optical system used for the camera is a crucial component, and its performance significantly impacts the effectiveness of the video conferencing.

[0004] Optical lenses currently on the market still have the following shortcomings:

[0005] 1. Existing optical lenses generally have a small image size, which cannot meet the requirements of mainstream large target surfaces;

[0006] 2. Existing optical lens formats cannot maintain low distortion while ensuring high resolution;

[0007] 3. To achieve a large target area, low distortion, and high resolution, existing optical lenses generally need to increase the number of lenses to balance system performance. In this case, the lens may have problems such as excessive overall length and large size.

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

[0009] To address the problems existing in the prior art, the present invention aims to provide an optical lens that has at least one of the following characteristics: large field of view (FOV) > 61°, optical distortion ≤ |-2.6%|, low cost, miniaturization, large target surface, and high resolution.

[0010] To achieve the aforementioned objective, this invention provides an optical lens comprising, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power.

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

[0012] According to one 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 one 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 concave, and the eighth lens is a concave-concave lens.

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

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

[0016] According to one technical solution of the present invention, the effective focal length F12 of the first lens and the second lens combination, 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 one 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 one technical solution of the present invention, the radius of curvature R31 of the object side and the radius of curvature R32 of the image side of the third lens and the effective focal length F of the optical lens satisfy the following relationship: 0.6≤(F / R31)+(F / R32)≤1.2.

[0019] According to one 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 one technical solution of the present invention, the radius of curvature R51 of the object side and the radius of curvature R52 of the image side of the fifth lens and the effective focal length F5 of the fifth lens satisfy the following relationship: -2.94≤F5 / (R51+R52)≤-1.68.

[0021] According to one 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 one 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 one technical solution of the present invention, the radius of curvature R72 of the image side surface of the seventh lens and the effective focal length F7 of the seventh lens satisfy the following relationship: 0.4≤|R72 / F7|≤1.4.

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

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

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

[0027] According to one technical solution of the present invention, the effective focal length F7 of the seventh lens, 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.

[0028] According to one 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 one technical solution of the present invention, the total optical length TTL, the effective focal length F of the optical lens 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 one 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 and second lenses, 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 surface of the third lens, R32 is the radius of curvature of the image-side surface of the third lens, F4 is the effective focal length of the fourth lens, R51 is the radius of curvature of the object-side surface of the fifth lens, R52 is the radius of curvature of the image-side surface 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 effective optical diameter position of the image-side surface of the eighth lens, SSAG_R81 is the sag of the effective optical 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 combined effective focal length of the seventh and eighth lenses, H is half the diagonal length of the imaging chip of the optical lens, Fa is the combined effective focal length of the first to fourth lenses, Fb is the combined effective focal length of the fifth to eighth lenses, and TTL is the total optical length of the optical lens.

[0047] According to the present invention, by setting the optical lens to include eight lenses, and setting the optical power of the first lens to the eighth lens to be positive optical power, negative optical power, positive optical power, positive optical power, negative optical power, positive optical power, negative optical power, and negative optical power respectively, the optical lens has 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 (image plane diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels). Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention;

[0050] Figure 2This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 1 of the present invention;

[0051] Figure 3 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention;

[0052] Figure 4 This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 2 of the present invention;

[0053] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 3 of the present invention;

[0054] Figure 6 This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 3 of the present invention;

[0055] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention;

[0056] Figure 8 This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 4 of the present invention. Detailed Implementation

[0057] 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 exemplary 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.

[0058] 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 this application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 formalized sense, unless expressly so specified herein.

[0063] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0064] like Figures 1 to 8 As shown, an embodiment of the present invention provides an optical lens, which, along the optical axis from the object side to the image side, sequentially includes: a first lens L1, a second lens L2, a third lens L3, an aperture stop 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 optical power, and the second lens L2 is a concave-convex lens with negative optical power. The first lens L1 and the second lens L2 are cemented together, which helps to correct chromatic aberration, improve color reproduction, and enhance the resolution quality of the lens. At the same time, it helps to reduce tolerance sensitivity and improve the lens assembly yield.

[0066] The third lens, L3, is a convex-concave lens with positive optical 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 generated by the front group lenses (the lenses in front of the aperture stop, i.e., the first lens L1 to the third lens L3) and reduce the aberration correction pressure of the rear group lenses (the lenses behind the aperture stop, 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 gently raises the light, which is beneficial for the subsequent group to correct edge aberrations.

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

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

[0071] The eighth lens L8 is a concave-convex lens with negative optical power, which is beneficial for correcting distortion and residual aberrations; 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 realize 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, by using the first lens L1, the second lens L2, the third lens L3, the aperture STO, and the fourth lens L4 as a focusing group, focusing on objects at a distance of 1m to 1f can be achieved by moving the focusing group.

[0073] 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 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 rays with a large field of view can be effectively controlled to enter the optical system, effectively expanding the field of view. At the same time, the trajectory of the light rays can be effectively controlled, allowing the light rays with a large field of view to transition smoothly to the rear, which is beneficial to reducing the generation of various aberrations and correcting 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. Reasonably allocating the ratio of the Abbe number difference between 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 beneficial for correcting system chromatic aberration, improving color reproduction, and enhancing 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. Reasonably controlling the ratio of the effective focal lengths of the positive and negative lenses of the first lens L1 and the second lens L2 helps to achieve a smooth transition of light, facilitates the correction of chromatic aberration, effectively reduces tolerance sensitivity, and improves the lens assembly yield.

[0076] In some embodiments of the present invention, the radius of curvature R31 of the object-side surface and the radius of curvature 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. A reasonable configuration of the ratio of the radius of curvature 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 beneficial for correcting astigmatism and improving the resolving power 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. Reasonably controlling the ratio of the fourth lens L4 to the total effective focal length of the optical system is beneficial for correcting spherical aberration of the system and improving the resolving power of the lens.

[0078] In some embodiments of the present invention, the radius of curvature R51 of the object-side surface and 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. Reasonably controlling the ratio of the effective focal length of the fifth lens L5 to the sum of the radii of curvature of the object-side and image-side surfaces of the fifth lens L5 is beneficial for better reducing optical distortion of the lens, achieving low distortion, and keeping the absolute value of 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 range of the ratio between the effective focal length of the sixth lens L6 and the total effective focal length of the optical system is beneficial for correcting the field curvature of the optical system and for improving the resolving 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. Reasonably controlling the ratio of the effective focal lengths of the sixth lens L6 and the seventh lens L7 is beneficial for correcting the back focus shift of the system at high and low temperatures, and helps to ensure that the optical system remains in focus even in high and low temperature environments ranging from -20℃ to +60℃.

[0081] In some embodiments of the present invention, the radius of curvature 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 radius of curvature of the image-side surface of the seventh lens L7 to the effective focal length of the seventh lens L7 is beneficial for correcting edge aberrations; at the same time, it allows the edge rays to rise slowly, which is beneficial for achieving a large target surface.

[0082] In some embodiments of the present invention, the maximum sagitta of the image-side surface of the eighth lens L8, the sagitta of the effective optical diameter position of the image-side surface, SSAG_R82, and the sagitta of the effective optical diameter position of the object-side surface, SSAG_R81, 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. Reasonably controlling the sagitta of the object-side and image-side surfaces of the eighth lens L8 is beneficial for correcting optical distortion, achieving low distortion, and keeping the absolute value of optical distortion within 2.6%.

[0083] In some embodiments of the present invention, the radius of curvature R81 of the object-side surface and the radius of curvature 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. Reasonably controlling the ratio of the radii of curvature of the object-side surface and the image-side surface of the eighth lens L8 is beneficial for better distortion correction, achieving low distortion, and keeping 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. Controlling 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 allows for smoother light transmission and improves 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. Reasonably controlling the effective focal length of the seventh lens L7 to elevate the light source is beneficial for effectively matching the chip size and large CRA, thus contributing to the realization of 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. Reasonably controlling 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 helps to balance various aberrations in the system and improve the lens's resolving power. Simultaneously, when the lens is focusing, it can achieve clear focusing on objects at object distances of 1m to 1nm, enabling the lens resolution to meet high-resolution requirements, with a maximum resolution of up to 50 million pixels.

[0087] In some embodiments of the present invention, the total optical length (TTL), 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. By reasonably setting the focal length, half-image height, and total system length, the requirements for compatible monitoring angles corresponding to different chips can be met. Given a fixed half-image height and a certain system focal length, by reasonably controlling the total optical length of the system, the total optical length of the system can be kept small, which is beneficial for achieving a small lens size.

[0088] The optical lens according to the present invention is described below with four specific embodiments based on the above-described configuration. The optical lens according to the present invention has eight lenses, with each cemented surface of the cemented lens designated as one surface, plus the aperture stop STO, protective glass CG, and image plane IMA, totaling 19 surfaces. The aperture stop STO is located between the third lens L3 and the fourth lens L4. For ease of description, each lens surface, aperture stop STO, and protective glass CG is numbered S1, S2 to S18. The aspherical surface satisfies the following formula:

[0089]

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

[0091] The data for the four sets of examples are shown in Table 1 below:

[0092]

[0093]

[0094] Table 1

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

[0096] Example 1

[0097] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention;

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

[0099] In Embodiment 1, the first lens L1 is a convex-convex lens with positive optical power, the second lens L2 is a concave-convex lens with negative optical power, the third lens L3 is a convex-concave lens with positive optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-concave lens with negative optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a concave-concave lens with negative optical power, and the eighth lens L8 is a concave-concave lens with negative optical 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; the aperture stop STO is located 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, radius of curvature R, thickness d, refractive index Nd of the material and Abbe number Vd.

[0102]

[0103]

[0104] Table 2

[0105] Table 3 lists the aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A1. 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .

[0106] Face 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 Embodiment 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] This embodiment is an optical lens that has 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 (image plane diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0110] Example 2

[0111] Figure 3 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention;

[0112] Figure 4 This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 2 of the present invention.

[0113] In Embodiment 2, the first lens L1 is a convex-convex lens with positive optical power, the second lens L2 is a concave-convex lens with negative optical power, the third lens L3 is a convex-concave lens with positive optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-concave lens with negative optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a concave-concave lens with negative optical power, and the eighth lens L8 is a concave-concave lens with negative optical 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; the aperture stop STO is located 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, radius of curvature R, thickness d, refractive index Nd of the material and Abbe number Vd.

[0116] Surface serial number Surface type radius of curvature 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 aspherical 33.463 2.479 1.54 55.71 S5 aspherical 35.044 1.129 S6(STO) spherical Infinity 0.900 S7 aspherical 13.058 1.977 1.50 80.99 S8 aspherical -15.041 0.855 S9 aspherical 8.882 1.290 1.64 23.53 S10 aspherical 6.308 1.533 S11 aspherical 30.170 2.134 1.54 53.29 S12 aspherical -9.821 0.100 S13 aspherical -76.216 1.356 1.60 29.58 S14 aspherical 20.904 2.877 S15 aspherical -13.042 1.902 1.54 51.28 S16 aspherical 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 aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A1. 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .

[0119] Face 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 And as shown in Tables 1, 4 and 5 above, combined with Figure 1 and Figure 2 As shown in Tables 1 to 3 above, in Embodiment 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] This second embodiment is an optical lens that has 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 (image plane diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0123] Example 3

[0124] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 3 of the present invention;

[0125] Figure 6 This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 3 of the present invention.

[0126] In Embodiment 3, the first lens L1 is a convex-convex lens with positive optical power, the second lens L2 is a concave-convex lens with negative optical power, the third lens L3 is a convex-concave lens with positive optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-concave lens with negative optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a convex-concave lens with negative optical power, and the eighth lens L8 is a concave-concave lens with negative optical 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; the aperture stop STO is located 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, radius of curvature R, thickness d, refractive index Nd of the material and Abbe number Vd.

[0129] Surface serial number Surface type radius of curvature 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 aspherical 27.641 1.297 1.64 23.53 S5 aspherical 38.938 1.201 S6(STO) spherical Infinity 0.901 S7 aspherical 49.668 1.752 1.54 55.71 S8 aspherical -12.161 0.868 S9 aspherical 9.286 1.149 1.64 23.53 S10 aspherical 6.145 1.044 S11 aspherical 36.390 2.673 1.54 55.71 S12 aspherical -8.020 0.100 S13 aspherical 80.920 1.800 1.64 23.53 S14 aspherical 15.340 2.827 S15 aspherical -21.357 1.932 1.54 55.71 S16 aspherical 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 aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A1. 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .

[0132]

[0133]

[0134] Table 7

[0135] Combination Figure 5 , Figure 6 As shown in Tables 1, 6 and 7 above, in Embodiment 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] This embodiment three is an optical lens that has 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 (image plane diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0137] Example 4

[0138] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention;

[0139] Figure 8 This is a schematic diagram of the F-Tan (theta) distortion of the optical lens in Embodiment 4 of the present invention.

[0140] In Embodiment 4, the first lens L1 is a convex-convex lens with positive optical power, the second lens L2 is a concave-convex lens with negative optical power, the third lens L3 is a convex-concave lens with positive optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-concave lens with negative optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a concave-concave lens with negative optical power, and the eighth lens L8 is a concave-concave lens with negative optical 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; the aperture stop STO is located 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, radius of curvature R, thickness d, refractive index Nd of the material and Abbe number Vd.

[0143]

[0144]

[0145] Table 8

[0146] Table 9 lists the aspherical coefficients of each aspherical lens in the optical lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspherical coefficient A4, the sixth-order aspherical coefficient A6, the eighth-order aspherical coefficient A8, and the tenth-order aspherical coefficient A10. 10 12th order aspherical coefficient A 12 Fourteenth-order aspherical coefficient A 14 and the sixteenth-order aspherical coefficient A 16 .

[0147] Face 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 Embodiment 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] This embodiment four is an optical lens that has 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 (image plane diagonal size can reach 16.4mm), and high resolution (resolution can reach up to 50 million pixels).

[0151] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, comprising, in sequence along the optical axis from the object side to the image side: The system comprises eight lenses with optical power: a first lens (L1) with positive optical power, a second lens (L2) with negative optical power, a third lens (L3) with positive optical power, a fourth lens (L4) with positive optical power, a fifth lens (L5) with negative optical power, a sixth lens (L6) with positive optical power, a seventh lens (L7) with negative optical power, and an eighth lens (L8) with negative optical power. The feature is that... The effective focal length F12 of the combination 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; 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 of the seventh lens (L7) is concave, and the eighth lens (L8) is a concave-concave lens.

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

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

4. The optical lens according to any one of claims 1-3, characterized in that, 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.

5. The optical lens according to any one of claims 1-3, 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.

6. The optical lens according to any one of claims 1-3, characterized in that, The radius of curvature R31 of the object side and the radius of curvature R32 of the image side 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.

7. The optical lens according to any one of claims 1-3, 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.

8. The optical lens according to any one of claims 1-3, characterized in that, The radius of curvature R51 of the object side and the radius of curvature R52 of the image side of the fifth lens (L5) satisfy the following relationship with the effective focal length F5 of the fifth lens (L5): -2.94≤F5 / (R51+R52)≤-1.

68.

9. The optical lens according to any one of claims 1-3, 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.

10. The optical lens according to any one of claims 1-3, characterized in that, 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.

11. The optical lens according to any one of claims 1-3, characterized in that, The radius of curvature 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.

12. The optical lens according to any one of claims 1-3, characterized in that, The maximum sagitta of the image side of the eighth lens (L8), the sagitta of the effective optical diameter position of the image side, SSAG_R82, and the sagitta of the effective optical diameter position of the object side, SSAG_R81, satisfy the following relationship: -0.4≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.

17.

13. The optical lens according to any one of claims 1-3, characterized in that, The radius of curvature R81 of the object side and the radius of curvature R82 of the image side of the eighth lens (L8) satisfy the following relationship: 0.88≤|R81 / R82|≤2.

9.

14. The optical lens according to any one of claims 1-3, characterized in that, The effective focal length F78 of the combination 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.

15. The optical lens according to any one of claims 1-3, characterized in that, 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.

16. The optical lens according to any one of claims 1-3, characterized in that, 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.

17. The optical lens according to any one of claims 1-3, characterized in that, The total optical length TTL, 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.

18. The optical lens according to claim 1, characterized in that, The optical lens must meet at least one of the following conditions: 3.95≤F12 / F≤8.7 1.1≤F12 / (Vd1-Vd2)≤4.25, -1.9≤F2 / F1≤-1.2, 0.68≤(F / R31)+(F / R32)≤0.95, 1≤F4 / F≤1.42, -2.8≤F5 / (R51+R52)≤-2.0, 0.85≤F6 / F≤1.05 -2.4≤F7 / F6≤-1.9, 0.5≤|R72 / F7|≤1.3 -0.3≤(SSAG_R82_max-SSAG_R82) / SSAG_R81≤-0.17, 1≤|R81 / R82|≤2.7, -2.15≤F / F78≤-1.85, -17.6≤F7*H / F≤-15.2, 1.85≤(Fa-Fb) / F≤2.26 13≤TTL*H / F≤13.6 Wherein, F12 is the effective focal length of the combination of the first lens (L1) and the second lens (L2), F is the effective focal length of the optical lens, Vd1 is the Abbe number of the first lens (L1), Vd2 is the Abbe number of the second lens (L1), F1 is the effective focal length of the first lens (L1), F2 is the effective focal length of the second lens (L2), R31 is the radius of curvature of the object-side surface of the third lens (L3), R32 is the radius of curvature of the image-side surface of the third lens (L3), F4 is the effective focal length of the fourth lens (L4), R51 is the radius of curvature of the object-side surface of the fifth lens (L5), R52 is the radius of curvature of the image-side surface of the fifth lens (L5), F5 is the effective focal length of the fifth lens (L5), F6 is the effective focal length of the sixth lens (L6), F7 is the effective focal length of the seventh lens (L7), and R72 is... The radius of curvature of the image side of the seventh lens (L7), SSAG_R82_max is the maximum sag of the image side of the eighth lens (L8), SSAG_R82 is the sag of the effective optical diameter of the image side of the eighth lens (L8), SSAG_R81 is the sag of the effective optical diameter of the object side of the eighth lens (L8), R81 is the radius of curvature of the object side of the eighth lens (L8), R82 is the radius of curvature of the image side of the eighth lens (L8), F78 is the combined effective focal length of the seventh lens (L7) and the eighth lens (L8), H is half the diagonal length of the imaging chip of the optical lens, Fa is the combined effective focal length of the first lens (L1) to the fourth lens (L4), Fb is the combined effective focal length of the fifth lens (L5) to the eighth lens (L8), and TTL is the total optical length of the optical lens.

Images