Optical lens

Abstract

An optical lens of the present invention comprises, in order: a first lens having negative optical power, a second lens having negative optical power, a third lens having positive or negative optical power, a fourth lens having positive optical power, a fifth lens having positive or negative optical power, a sixth lens having positive optical power, a seventh lens having positive optical power, an eighth lens having negative optical power, and a ninth lens having positive optical power, wherein the first lens is a convex-concave lens; the second lens is a convex-concave lens or a lens with a concave image-side surface; the third lens is a lens with a concave image-side surface; the fourth lens and the seventh lens are both biconvex lenses; the fifth lens is a convex-concave lens; the sixth lens is a lens with a convex image-side surface; the eighth lens is a lens with a concave object-side surface; and the ninth lens is a convex-concave lens or a lens with a convex object-side surface.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an optical lens with small size, large field of view and high resolution. Background Art

[0002] Due to their wide viewing angle, wide-angle lenses can capture more content when capturing large, visually impactful scenes. Therefore, they can meet specific imaging requirements in scenarios with specific imaging ranges. They are suitable for sports cameras, drones, in-vehicle imaging, video conferencing equipment, and even in complex environments such as severe vibration, high pressure, and high and low temperatures. In this context, the market is demanding increasingly high image quality from wide-angle lenses in order to achieve clearer images and a wider viewing angle. These lenses not only require excellent thermal stability to cope with these changing operating environments, but also require a compact size and weight, and the ability to be paired with higher-pixel chips to ensure clear and vivid images in a variety of scenarios.

[0003] However, the wide-angle lenses currently available on the market are difficult to meet diverse usage needs. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide an optical lens with small size, large field of view, high resolution and clear imaging in the temperature range of -40℃ to 80℃.

[0005] To achieve the above object, the present invention provides an optical lens, comprising, in order: a first lens having negative optical power, a second lens having negative optical power, a third lens having positive or negative optical power, a fourth lens having positive optical power, a fifth lens having positive or negative optical power, a sixth lens having positive optical power, a seventh lens having positive optical power, an eighth lens having negative optical power, and a ninth lens having positive optical power.

[0006] The first lens is a convex-concave lens;

[0007] The second lens is a meniscus lens or a lens with a concave image side surface;

[0008] The third lens is a lens with a concave image side surface;

[0009] The fourth lens and the seventh lens are both biconvex lenses;

[0010] The fifth lens is a meniscus lens;

[0011] The sixth lens is a lens with a convex image side surface;

[0012] The eighth lens is a lens with a concave object side surface;

[0013] The ninth lens is a meniscus lens or a lens with a convex object-side surface.

[0014] According to one aspect of the present invention, the seventh lens is cemented to the eighth lens.

[0015] According to one aspect of the present invention, the optical system further includes a stop located between the fourth lens and the fifth lens or between the fifth lens and the sixth lens.

[0016] According to one aspect of the present invention, the entire focal length FB of the rear aperture lens group of the optical lens and the total effective focal length F of the optical lens satisfy the following relationship: 1.6≤FB / F≤2.5.

[0017] According to one aspect of the present invention, the total optical length TTL of the optical lens and the distance Ts between the image side surface of the preceding lens of the stop and the stop on the optical axis satisfy the following relationship: 0≤Ts / TTL≤0.2.

[0018] According to one aspect of the present invention, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy the following relationship: -3.2≤F1 / F≤-1.5.

[0019] According to one aspect of the present invention, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy the following relationship: -17.7≤F2 / F≤-3.4.

[0020] According to one aspect of the present invention, the central curvature radius R21 of the object-side surface of the second lens, the central curvature radius R22 of the image-side surface of the second lens, and the total effective focal length F of the optical lens satisfy the following relationship: -0.1≤F / (R21+R22)≤0.6.

[0021] According to one aspect of the present invention, the central curvature radius R31 of the object-side surface of the third lens, the central curvature radius R32 of the image-side surface of the third lens, and the total effective focal length F of the optical lens satisfy the following relationship: 0≤F / (R31+R32)≤1.8.

[0022] According to one aspect 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: 1.2≤F4 / F≤4.6.

[0023] According to one aspect of the present invention, the central curvature radius R51 of the object-side surface of the fifth lens, the central curvature radius R52 of the image-side surface of the fifth lens, and the total effective focal length F of the optical lens satisfy the following relationship: -0.3≤F / (R51+R52)≤0.

[0024] According to one aspect 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: 2.0≤F6 / F≤4.3.

[0025] According to one aspect of the present invention, the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy the following relationship: 1.4≤F7 / F≤2.0.

[0026] According to one aspect of the present invention, the distance T67 between the sixth lens and the seventh lens on the optical axis and the effective focal length F of the optical lens satisfy the following relationship: 0≤T67 / F≤0.5.

[0027] According to one aspect of the present invention, the distance T89 between the eighth lens and the ninth lens on the optical axis and the total optical length TTL of the optical lens meet the following relationship: 0≤T89 / TTL≤0.6.

[0028] According to one aspect of the present invention, the effective focal length F8 of the eighth lens and the total effective focal length F of the optical lens satisfy the following relationship: -1.8≤F8 / F≤-1.0.

[0029] According to one aspect of the present invention, the effective focal length F9 of the ninth lens and the total effective focal length F of the optical lens satisfy the following relationship: 2.5≤F9 / F≤7.0.

[0030] According to one aspect of the present invention, the back focal length BFL of the optical lens and the total effective focal length F of the optical lens satisfy the following relationship: 1.0≤BFL / F≤1.5.

[0031] According to one aspect of the present invention, the total effective focal length F of the optical lens and the total optical length TTL of the optical lens satisfy the following relationship: 7.6≤TTL / F≤8.8.

[0032] According to one aspect of the present invention, the total optical length TTL of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following relationship: 2.7≤TTL / H≤3.2.

[0033] According to one aspect of the present invention, the maximum clear aperture D of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the total effective focal length F of the optical lens satisfy the following relationship: 0.4≤D / H / F≤0.7.

[0034] According to one aspect of the present invention, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1.7≤F / ENPD≤1.9.

[0035] According to one aspect of the present invention, a central thickness dn of the nth lens having the largest central thickness among the first to ninth lenses and a central thickness dm of the mth lens having the smallest central thickness among the first to ninth lenses satisfy the following relationship: 4.2≤dn / dm≤6.7.

[0036] The optical lens according to the present invention is configured with nine lenses. By rationally allocating the positive and negative optical powers of each lens, optimizing the concave and convex shapes of each lens, and setting reasonable parameters, a compact optical lens with a large field of view (FOV = 160°), high resolution (35 million pixels), and clear imaging within a temperature range of -40°C to 80°C is achieved. The imaging target surface of the optical lens can reach 1 / 1.8", and the chief ray incidence angle (CRA) is less than 18°. It is compatible with a variety of large-target-surface sensors, has broad application prospects, and has high market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the structure of the optical lens of Example 1 of the present invention;

[0038] Figure 2 Schematic diagram of the structure of the optical lens of Example 2 of the present invention;

[0039] Figure 3 Schematic diagram of the structure of the optical lens of Example 3 of the present invention;

[0040] Figure 4 Schematic diagram of the structure of the optical lens of Example 4 of the present invention;

[0041] Figure 5 Schematic diagram of the structure of the optical lens of Example 5 of the present invention. DETAILED DESCRIPTION

[0042] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0043] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0044] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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 image side is called the image-side surface of the lens.

[0045] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0046] Figure 1 FIG. 1 is a schematic diagram showing the structure of an optical lens according to an embodiment of the present invention. Figure 1 As shown, the optical lens of the present invention includes, in order from the object side to the image side of the optical axis and from the object side to the image side of the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9 and a protective flat glass CG.

[0047] Along the optical axis from the object side to the image side, the first lens L1 has negative refractive power, which causes it to diverge the light passing through it, maintaining an upward trend. Combined with its convex-concave shape, this reduces the angle of incidence of light on the object-side surface of the first lens L1, allowing light to pass smoothly through the first lens L1 and reach the rear optical system, thereby achieving a wide field of view.

[0048] The second lens element L2 is a meniscus lens with negative optical power or a lens with a concave image-side surface. When the second lens element L2 is a meniscus, it can collect light entering through the first lens element L1, which helps the light transition smoothly to the second lens element L2 and reduces sensitivity. When the object-side surface of the second lens element L2 is concave, it cooperates with the concave image-side surface of the first lens to reduce the front diameter of the lens and the size, which is conducive to miniaturization and cost reduction.

[0049] The image-side surface of the third lens L3 is concave and has positive or negative power. This facilitates the smooth entry of light into the rear optical system, helps compensate for the spherical aberration introduced by the first two lens groups, and can further correct the aberration caused by the front lens group. At the same time, it allows as much wide-angle light as possible to enter the system, further helping to improve illumination.

[0050] The fourth lens L4 is a biconvex lens with positive refractive power, which helps to converge light, thereby increasing the aperture of the lens and shortening the overall length of the lens, making the optical system more compact.

[0051] The fifth lens element L5 is a meniscus lens with positive or negative refractive power. This ensures a smoother light path between the fourth lens element L4 and the fifth lens element L5. It also allows the light emitted by the fourth lens element L4 to be better received by the fifth lens element L5, reducing light loss in each field of view and improving the relative illumination of each field of view.

[0052] The image-side surface of the sixth lens element L6 is convex and has positive refractive power. Combined with the aspherical surface, it is conducive to better correction of aberrations in the central field of view and is more conducive to achieving the requirement of a larger FNO.

[0053] The seventh lens element L7 is a biconvex lens with positive refractive power. This lens has a converging effect on light, further reducing aberrations while also effectively and smoothly converging the light at the end, ensuring a smooth transition to the rear and the imaging surface.

[0054] The object-side surface of the eighth lens element L8 is concave and has negative optical power. This allows light rays passing through the seventh and eighth lenses L7 and L8 to transition smoothly to the imaging surface, which helps correct astigmatism and field curvature, thereby improving the resolving power of the optical system.

[0055] The ninth lens element L9 is a concave-convex lens or a lens with a convex object-side surface having positive optical power, which can effectively compress light, thereby tightening the light beam and reducing the main ray angle to match the chip CRA curve requirements.

[0056] In the embodiment of the present invention, preferably, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are all made of glass, which can effectively suppress the deviation of the back focus of the optical lens due to temperature changes, thereby improving system stability; and can avoid lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the lens.

[0057] In the embodiment of the present invention, preferably, the seventh lens L7 and the eighth lens L8 are cemented together to minimize or eliminate chromatic aberration, improve image quality, and reduce reflection loss of light energy, thereby achieving high resolution and enhancing the clarity of lens imaging.

[0058] In an embodiment of the present invention, preferably, the aperture STO for limiting the light beam is located between the fourth lens L4 and the fifth lens L5 or between the fifth lens L5 and the sixth lens L6, which is conducive to achieving a small FNO, increasing the amount of light entering, compressing the front and rear light rays, shortening the total length of the optical system, and reducing the aperture of the front and rear lenses.

[0059] Among them, the lens located between the object side surface and the aperture STO along the optical axis direction constitutes a front lens group, and the lens located between the aperture STO and the image side surface constitutes a rear lens group.

[0060] In an embodiment of the present invention, preferably, the entire focal length FB of the lens group behind the aperture of the optical lens and the total effective focal length F of the optical lens satisfy the following relationship: 1.6≤FB / F≤2.5, which is beneficial for controlling the height of the incident light ray exiting the optical system, reducing the aberration of the optical system and the outer diameter of the lens; and at the same time, it can correct the field curvature generated by the lens group located in front of the aperture STO, reducing the influence of the field curvature on the resolution.

[0061] In an embodiment of the present invention, preferably, the total optical length TTL of the optical lens and the distance Ts between the image side surface of the lens preceding the aperture and the aperture on the optical axis satisfy the following relationship: 0≤Ts / TTL≤0.2, which can make the distance between the lens preceding the aperture STO and the aperture STO smaller, so that the light near the aperture STO transitions smoothly, which is conducive to improving imaging quality.

[0062] In an embodiment of the present invention, preferably, the effective focal length F1 of the first lens L1 and the total effective focal length F of the optical lens satisfy the following relationship: -3.2≤F1 / F≤-1.5. By reasonably setting the focal length of the first lens L1, light with a large field angle is facilitated to enter the optical system.

[0063] In the embodiments of the present invention, preferably, the effective focal length F2 of the second lens element L2 and the total effective focal length F of the optical lens satisfy the following relationship: -17.7 ≤ F2 / F ≤ -3.4. Reasonable setting of the focal length of the second lens element L2, such that the second lens element L2 is a negative lens or has a larger focal length, can change aberrations without causing light convergence, thereby facilitating an increase in aperture, achieving a greater amount of light entering, and increasing the brightness of the imaging surface.

[0064] In the embodiment of the present invention, preferably, the central radius of curvature R21 of the object-side surface of the second lens element L2, the central radius of curvature R22 of the image-side surface of the second lens element L2, and the total effective focal length F of the optical lens element satisfy the following relationship: -0.1≤F / (R21+R22)≤0.6. This can effectively control the surface curvature of the second lens element L2, assist incident light in entering the optical lens element, and effectively correct aberrations, thereby improving imaging quality.

[0065] In the embodiment of the present invention, preferably, the central curvature radius R31 of the object-side surface of the third lens L3, the central curvature radius R32 of the image-side surface of the third lens L3, and the total effective focal length F of the optical lens satisfy the following relationship: 0≤F / (R31+R32)≤1.8. This allows the lens to effectively receive the front light beam, compensate for the spherical aberration introduced by the first two lenses, and further correct the aberrations generated by the front lens group.

[0066] In the embodiment of the present invention, preferably, the effective focal length F4 of the fourth lens element L4 and the effective focal length F of the optical lens element satisfy the following relationship: 1.2≤F4 / F≤4.6, which is conducive to controlling the light distribution between the first lens element L1 to the fourth lens element L4 and reducing the aberration caused by the large-angle light entering through the first lens element L1.

[0067] In the embodiment of the present invention, preferably, the central curvature radius R51 of the object-side surface of the fifth lens element L5, the central curvature radius R52 of the image-side surface of the fifth lens element L5, and the total effective focal length F of the optical lens element satisfy the following relationship: -0.3≤F / (R51+R52)≤0. By adjusting the focal length and curvature radius of the fifth lens element L5, the aberrations caused by the preceding four lenses can be better corrected, and high-order spherical aberration and coma can be improved, which is conducive to achieving high resolution and making the overall resolution uniform.

[0068] In the embodiment of the present invention, preferably, the effective focal length F6 of the sixth lens L6 and the effective focal length F of the optical lens satisfy the following relationship: 2.0≤F6 / F≤4.3. By properly setting the lens focal length, it is beneficial to improve the thermal compensation of the lens, so that the optical lens has good resolution at both high and low temperatures.

[0069] In the embodiment of the present invention, preferably, the effective focal length F7 of the seventh lens L7 and the effective focal length F of the optical lens satisfy the following relationship: 1.4≤F7 / F≤2.0, which is conducive to converging light and ensuring the light throughput of the entire optical lens.

[0070] In the embodiment of the present invention, preferably, the distance T67 between the sixth lens element L6 and the seventh lens element L7 on the optical axis and the effective focal length F of the optical lens satisfy the following relationship: 0≤T67 / F≤0.5. This facilitates a smooth transition of light to the seventh lens element L7 and maximizes light collection.

[0071] In the embodiment of the present invention, preferably, the distance T89 between the eighth lens element L8 and the ninth lens element L9 on the optical axis and the total optical length TTL of the optical lens element satisfy the following relationship: 0≤T89 / TTL≤0.6, which helps light rays pass smoothly through the last lens element to reach the imaging surface.

[0072] In the embodiment of the present invention, preferably, the effective focal length F8 of the eighth lens element L8 and the total effective focal length F of the optical lens satisfy the following relationship: -1.8≤F8 / F≤-1.0, which is conducive to smooth light transition, correcting chromatic aberration, enhancing the resolving power of the optical lens, and improving imaging quality.

[0073] In the embodiment of the present invention, preferably, the effective focal length F9 of the ninth lens element L9 and the total effective focal length F of the optical lens element satisfy the following relationship: 2.5≤F9 / F≤7.0, which has the effect of controlling the angle of emergence of the main light, and is conducive to achieving high illumination and a large target surface.

[0074] In an embodiment of the present invention, preferably, the back focal length BFL of the optical lens and the total effective focal length F of the optical lens satisfy the following relationship: 1.0≤BFL / F≤1.5, which is conducive to making the lens have a longer back focal length while achieving miniaturization, and is conducive to the assembly of the optical lens and avoiding interference.

[0075] The back focal length BFL is the distance from the vertex of the last optical surface to the rear focus, that is, the back focal length BFL is the distance from the image side surface of the ninth lens L9 to the center of the image plane.

[0076] In an embodiment of the present invention, preferably, the total effective focal length F of the optical lens and the total optical length TTL of the optical lens satisfy the following relationship: 7.6≤TTL / F≤8.8, which can effectively limit the length of the optical lens and achieve miniaturization.

[0077] In an embodiment of the present invention, preferably, the total optical length TTL of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following relationship: 2.7≤TTL / H≤3.2, so that the optical lens can have a larger image surface.

[0078] In an embodiment of the present invention, preferably, the maximum clear aperture D of the object-side surface of the first lens L1 corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the total effective focal length F of the optical lens satisfy the following relationship: 0.4≤D / H / F≤0.7. Under the condition of a fixed focal length, the optical lens has the characteristics of a large target surface and a small aperture.

[0079] In an embodiment of the present invention, preferably, the total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1.7≤F / ENPD≤1.9, which is conducive to increasing the amount of light entering and realizing an optical lens with a small FNO.

[0080] In the embodiments of the present invention, preferably, a center thickness dn of the nth lens having the largest center thickness among the first to ninth lenses L1 to L9 and a center thickness dm of the mth lens having the smallest center thickness among the first to ninth lenses L1 to L9 satisfy the following relationship: 4.2≤dn / dm≤6.7. Reasonable control of the thickness of each lens helps stabilize the function of each lens, minimizes light variations at high and low temperatures, and improves temperature performance.

[0081] The following describes four specific embodiments of the optical lens according to the present invention, based on the aforementioned configuration. The optical lens according to the present invention comprises nine lenses. The seventh lens L7 and the eighth lens L8, after being cemented together, have three surfaces. Together with the aperture stop STO, the protective glass CG, and the image plane IMA, this adds up to 22 surfaces. For ease of description, the 17 lens surfaces, the aperture stop STO, and the protective glass CG are numbered S1, S2, through S20. Furthermore, the aspheric surface satisfies the following formula:

[0082]

[0083] Where z is the axial distance from the surface to the vertex at a height h 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 ...are the aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, etc. respectively.

[0084] The data of the four examples are shown in Table 1 below:

[0085]

[0086]

[0087] Table 1

[0088] Example 1:

[0089] Figure 1 Schematic diagram of the structure of the optical lens of Example 1 of the present invention.

[0090] In Example 1, along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens with negative optical power, the second lens L2 is a convex-concave lens with negative optical power, the third lens L3 is a convex-concave lens with negative optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-convex 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-convex lens with positive optical power, the eighth lens L8 is a convex-convex lens with negative optical power, and the ninth lens L9 is a convex-convex lens with positive optical power.

[0091] The second lens L2, the fifth lens L5, the sixth lens L6, and the ninth lens L9 are aspherical lenses.

[0092] The aperture stop STO is disposed between the fifth lens L5 and the sixth lens L6.

[0093] Table 2 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius R value, thickness, refractive index of the material, and Abbe number:

[0094]

[0095]

[0096] Table 2

[0097] Table 3 lists the aspheric coefficients of the aspheric lenses in this embodiment, K is the quadratic constant of the surface, A4, A6, A8, A 10 、A 12 They are the aspheric coefficients of the fourth, sixth, eighth, tenth and twelfth orders respectively.

[0098] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> S3 0.00 8.14E-03 -7.88E-04 6.45E-05 -3.11E-06 6.94E-08 S4 4.00 8.79E-03 -1.02E-03 1.28E-04 -1.04E-05 3.58E-07 S9 -0.08 3.04E-03 -2.12E-05 2.84E-05 -3.12E-06 1.46E-07 S10 0.00 1.69E-03 6.73E-05 1.08E-05 -2.34E-06 1.43E-07 S12 0.19 -9.49E-04 8.40E-05 2.15E-06 -1.69E-06 2.59E-08 S13 -1.63 1.14E-03 1.85E-05 -1.52E-05 4.12E-06 -4.19E-07 S17 0.00 -9.69E-04 -1.59E-04 2.69E-05 -3.63E-06 1.52E-07 S18 -1.11 8.32E-04 -1.01E-04 1.45E-05 -1.62E-06 5.78E-08

[0099] Table 3

[0100] according to Figure 1 As shown in Tables 1-3, this embodiment can provide an optical lens with a small size, a large field of view (FOV=160°), a high resolution (35 million pixels), and clear imaging within a temperature range of -40°C to 80°C.

[0101] Example 2:

[0102] Figure 2 Schematic diagram of the structure of the optical lens of Example 2 of the present invention.

[0103] In Example 2, along the direction from the object side to the image side of the optical axis, the first lens L1 is a meniscus lens with negative optical power, the second lens L2 is a meniscus lens with negative optical power, the third lens L3 is a meniscus lens with negative optical power, the fourth lens L4 is a meniscus lens with positive optical power, the fifth lens L5 is a meniscus lens with negative optical power, the sixth lens L6 is a meniscus lens with positive optical power, the seventh lens L7 is a meniscus lens with positive optical power, the eighth lens L8 is a meniscus lens with negative optical power, and the ninth lens L9 is a meniscus lens with positive optical power.

[0104] The second lens L2, the fifth lens L5, the sixth lens L6, and the ninth lens L9 are aspherical lenses.

[0105] The aperture stop STO is disposed between the fifth lens L5 and the sixth lens L6.

[0106] Table 4 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius R value, thickness, refractive index of the material, and Abbe number:

[0107] Surface number Surface type R-value thickness Refractive index Abbe number S1 spherical surface 16.421 0.6 1.83 42.7 S2 spherical surface 4.419 1.86 S3 Aspheric -162.756 0.6 1.69 53.2 S4 Aspheric 8.815 2.59 S5 spherical surface -4.544 0.79 1.50 81.6 S6 spherical surface 7.561 0.11 S7 spherical surface 6.328 1.76 1.90 31.3 S8 spherical surface -11.642 0.26 S9 Aspheric -6.211 0.89 1.82 24.1 S10 Aspheric -11.574 0.61 S11(STO) spherical surface Infinity -0.51 S12 Aspheric 4.847 2.75 1.50 81.6 S13 Aspheric -8.34 0.08 S14 spherical surface 6.827 2.76 1.50 81.6 S15 spherical surface -3.192 1.49 1.81 25.5 S16 spherical surface -29.097 0.73 S17 Aspheric 17.813 1.94 1.81 40.7 S18 Aspheric -168.641 2.1 S19 spherical surface Infinity 0.5 1.52 64.2 S20 spherical surface Infinity 0.86 Image spherical surface Infinity 0

[0108] Table 4

[0109] Table 5 lists the aspheric coefficients of the aspheric lenses in this embodiment, K is the quadratic constant of the surface, A4, A6, A8, A 10 、A 12 They are the aspheric coefficients of the fourth, sixth, eighth, tenth and twelfth orders respectively.

[0110] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> S3 0.00 7.63E-03 -7.25E-04 6.24E-05 -3.32E-06 7.61E-08 S4 3.15 8.70E-03 -8.50E-04 1.23E-04 -1.05E-05 3.84E-07 S9 0.75 1.96E-03 -7.06E-05 2.61E-05 -3.27E-06 1.14E-07 S10 0.00 1.89E-03 5.69E-05 1.37E-05 -2.27E-06 4.55E-08 S12 0.21 -8.12E-04 7.77E-05 8.54E-07 -1.39E-06 3.77E-08 S13 1.03 5.90E-04 4.90E-05 -1.43E-05 3.80E-06 -3.23E-07 S17 0.00 -1.18E-03 -1.78E-04 2.74E-05 -3.14E-06 1.17E-07 S18 1454.69 6.20E-04 -1.34E-04 1.59E-05 -1.55E-06 5.18E-08

[0111] Table 5

[0112] according to Figure 2 As shown in Tables 1, 4, and 5, this embodiment can provide an optical lens with a small size, a large field of view (FOV=160°), a high resolution (35 million pixels), and clear imaging within a temperature range of -40°C to 80°C.

[0113] Example 3:

[0114] Figure 3 Schematic diagram of the structure of the optical lens of Example 3 of the present invention.

[0115] In Example 3, along the direction from the object side to the image side of the optical axis, the first lens L1 is a meniscus lens with negative optical power, the second lens L2 is a meniscus lens with negative optical power, the third lens L3 is a meniscus lens with negative optical power, the fourth lens L4 is a meniscus lens with positive optical power, the fifth lens L5 is a meniscus lens with negative optical power, the sixth lens L6 is a meniscus lens with positive optical power, the seventh lens L7 is a meniscus lens with positive optical power, the eighth lens L8 is a meniscus lens with negative optical power, and the ninth lens L9 is a meniscus lens with positive optical power.

[0116] The second lens L2, the fifth lens L5, the sixth lens L6, and the ninth lens L9 are aspherical lenses.

[0117] The aperture stop STO is disposed between the fifth lens L5 and the sixth lens L6.

[0118] Table 6 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius R value, thickness, refractive index of the material, and Abbe number:

[0119]

[0120]

[0121] Table 6

[0122] Table 7 lists the aspheric coefficients of the aspheric lenses in this embodiment, K is the quadratic constant of the surface, A4, A6, A8, A 10 、A 12 They are the aspheric coefficients of the fourth, sixth, eighth, tenth and twelfth orders respectively.

[0123] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> S3 0.00 1.02E-02 -5.89E-04 6.05E-05 -3.53E-06 1.12E-07 S4 12.84 1.10E-02 -7.22E-04 1.18E-04 -9.59E-06 3.92E-07 S9 0.30 2.27E-03 -4.68E-05 2.30E-05 -3.18E-06 1.52E-07 S10 0.00 1.96E-03 1.42E-05 1.73E-05 -3.21E-06 1.63E-07 S12 1.33 7.28E-04 9.00E-05 -9.10E-06 1.70E-06 -3.20E-07 S13 -257.82 7.34E-04 3.08E-06 -1.94E-05 5.84E-06 -6.92E-07 S17 0.00 -1.92E-03 -1.99E-04 1.66E-05 -2.79E-06 1.20E-07 S18 125.41 6.62E-04 -2.46E-04 1.53E-05 -1.20E-06 4.26E-08

[0124] Table 7

[0125] according to Figure 3 As shown in Tables 1, 6, and 7, this embodiment can provide an optical lens with a small size, a large field of view (FOV=160°), a high resolution (35 million pixels), and clear imaging within a temperature range of -40°C to 80°C.

[0126] Example 4:

[0127] Figure 4 Schematic diagram of the structure of the optical lens of Example 4 of the present invention.

[0128] In Example 4, along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens with negative optical power, the second lens L2 is a convex-concave lens with negative optical power, the third lens L3 is a convex-concave lens with negative optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-convex 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-convex lens with positive optical power, the eighth lens L8 is a convex-convex lens with negative optical power, and the ninth lens L9 is a convex-convex lens with positive optical power.

[0129] The second lens L2, the fifth lens L5, the sixth lens L6, and the ninth lens L9 are aspherical lenses.

[0130] The aperture stop STO is disposed between the fifth lens L5 and the sixth lens L6.

[0131] Table 8 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius R value, thickness, refractive index of the material, and Abbe number:

[0132] Surface number Surface type R-value thickness Refractive index Abbe number S1 spherical surface 23.545 0.6 1.83 42.7 S2 spherical surface 3.825 1.44 S3 Aspheric 24.683 0.9 1.69 53.2 S4 Aspheric 7.803 2.37 S5 spherical surface -5.987 0.8 1.50 81.6 S6 spherical surface 7.702 0.08 S7 spherical surface 6.023 2.41 1.90 31.3 S8 spherical surface -7.899 0.31 S9 Aspheric -4.234 1.29 1.82 24.1 S10 Aspheric -11.176 0.61 S11(STO) spherical surface Infinity -0.51 S12 Aspheric 4.863 1.73 1.50 81.6 S13 Aspheric -9.239 0.89 S14 spherical surface 7.721 3.24 1.50 81.6 S15 spherical surface -3.133 0.6 1.81 25.5 S16 spherical surface -39.75 1.15 S17 Aspheric -540.339 1.65 1.81 40.7 S18 Aspheric -7.853 2.1 S19 spherical surface Infinity 0.5 1.52 64.2 S20 spherical surface Infinity 0.84 Image spherical surface Infinity 0

[0133] Table 8

[0134] Table 9 lists the aspheric coefficients of the aspheric lenses in this embodiment, K is the quadratic constant of the surface, A4, A6, A8, A 10 、A 12 They are the aspheric coefficients of the fourth, sixth, eighth, tenth and twelfth orders respectively.

[0135] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> S3 0.00 8.64E-03 -7.02E-04 7.07E-05 -4.20E-06 1.29E-07 S4 5.09 8.77E-03 -9.15E-04 1.17E-04 -1.06E-05 4.52E-07 S9 -0.10 3.27E-03 -3.58E-05 2.96E-05 -2.65E-06 8.67E-08 S10 0.00 1.76E-03 9.37E-05 1.25E-05 -1.50E-06 7.07E-08 S12 0.07 -1.22E-03 1.22E-04 2.97E-06 -2.08E-06 6.96E-08 S13 -1.63 1.09E-03 8.89E-07 -2.29E-05 4.96E-06 -4.05E-07 S17 0.00 -1.87E-03 -2.00E-04 2.26E-05 -3.68E-06 1.88E-07 S18 -1.83 -1.30E-04 -1.64E-04 1.37E-05 -1.49E-06 6.02E-08

[0136] Table 9

[0137] according to Figure 4 As shown in Tables 1, 8, and 9, this embodiment can provide an optical lens with a small size, a large field of view (FOV=160°), a high resolution (35 million pixels), and clear imaging within a temperature range of -40°C to 80°C.

[0138] Example 5:

[0139] Figure 5 Schematic diagram of the structure of the optical lens of Example 5 of the present invention.

[0140] In Example 5, along the direction from the object side to the image side of the optical axis, the first lens L1 is a convex-concave lens with negative optical power, the second lens L2 is a convex-concave 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 positive optical power, the sixth lens L6 is a convex-concave lens with positive optical power, the seventh lens L7 is a convex-convex lens with positive optical power, the eighth lens L8 is a convex-concave lens with negative optical power, and the ninth lens L9 is a convex-convex lens with positive optical power.

[0141] The second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the ninth lens L9 are aspherical lenses.

[0142] The aperture stop STO is disposed between the fourth lens L4 and the fifth lens L5.

[0143] Table 10 below lists the relevant parameters of each lens of this embodiment, including surface type, curvature radius R value, thickness, refractive index of the material, and Abbe number:

[0144] Surface number Surface type R-value thickness Refractive index Abbe number S1 spherical surface 21.011 1.5 1.80 46.6 S2 spherical surface 3.859 0.31 S3 Aspheric 4.266 0.57 1.50 81.6 S4 Aspheric 2.195 3.04 S5 Aspheric 22.517 1.98 1.85 40.1 S6 Aspheric 25.349 0.27 S7 Aspheric 13.41 0.95 1.88 37.2 S8 Aspheric -49.591 0.82 S11(STO) spherical surface Infinity 0.18 S10 Aspheric -20.74 0.86 1.77 49.2 S11 Aspheric -15.353 0.31 S12 Aspheric -36.208 2.47 1.50 81.6 S13 Aspheric -4.232 0.86 S14 spherical surface 8.933 3.23 1.62 56.9 S15 spherical surface -4.15 0.55 1.76 27.5 S16 spherical surface 8.595 0.36 S17 Aspheric 10.401 2.23 1.50 81.6 S18 Aspheric -5.391 2 S19 spherical surface Infinity 0.5 1.52 64.2 S20 spherical surface Infinity 0.7 Image spherical surface Infinity 0

[0145] Table 10

[0146] Table 11 lists the aspheric coefficients of the aspheric lenses in this embodiment, K is the quadratic constant of the surface, A4, A6, A8, A 10 、A 12 They are the aspheric coefficients of the fourth, sixth, eighth, tenth and twelfth orders respectively.

[0147] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> S3 0.00 7.92E-03 -1.16E-03 1.20E-04 -6.29E-06 6.60E-08 S4 -0.53 6.30E-03 -4.18E-04 -2.30E-04 5.95E-05 -4.82E-06 S5 0.00 -1.69E-03 -1.20E-05 2.79E-05 -2.58E-06 -1.77E-08 S6 0.00 -5.22E-03 -9.86E-04 3.14E-04 -3.69E-05 1.77E-06 S7 -17.10 9.25E-03 -9.23E-04 2.24E-04 -4.50E-05 3.99E-06 S8 0.00 1.85E-02 -1.73E-04 4.13E-04 -1.56E-04 1.64E-05 S10 -128.73 1.21E-02 -1.01E-03 1.94E-04 -2.51E-05 4.82E-07 S11 -28.54 8.90E-03 -1.05E-03 2.00E-04 -4.17E-06 -2.11E-06 S12 0.00 4.92E-03 -7.48E-04 1.37E-04 -1.36E-06 -9.34E-07 S13 -0.30 8.98E-04 -9.75E-05 1.73E-05 -3.08E-06 3.08E-07 S17 2.60 2.56E-03 -2.49E-06 -1.38E-05 9.76E-07 -3.12E-08 S18 0.45 7.60E-03 -5.39E-05 7.49E-06 -9.35E-07 2.45E-08

[0148] Table 11

[0149] according to Figure 5As shown in Tables 1, 10, and 11, this embodiment can provide an optical lens with a small size, a large field of view (FOV=160°), a high resolution (35 million pixels), and clear imaging within a temperature range of -40°C to 80°C.

[0150] The present invention is equipped with nine lenses. By reasonably allocating the optical power of each lens, optimizing the shape of each lens, and reasonably setting parameters, by reasonably allocating the positive and negative optical power of each lens, optimizing the concave and convex shapes of each lens, and setting reasonable parameters, the field of view angle can reach 160°, the pixel count can reach 35 million, and the optical lens can image clearly within the temperature range of -40°C to 80°C, ensuring imaging quality. At the same time, the imaging target surface of the optical lens can reach 1 / 1.8", and the main ray incidence angle CRA is less than 18°. It can be adapted to a variety of large-target-surface sensors, has broad application prospects, and has high market competitiveness.

[0151] The above description is merely one embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An optical lens, comprising, in order from the object side to the image side along the optical axis: A first lens (L1) with negative optical power, a second lens (L2) with negative optical power, a third lens (L3) with positive or negative optical power, a fourth lens (L4) with positive optical power, a fifth lens (L5) with positive or negative optical power, a sixth lens (L6) with positive optical power, a seventh lens (L7) with positive optical power, an eighth lens (L8) with negative optical power, and a ninth lens (L9) with positive optical power, comprising nine lenses having optical power, characterized in that: The first lens (L1) is a convex-concave lens; The second lens (L2) is a meniscus lens or a lens with a concave image side surface; The third lens (L3) is a lens with a concave image side surface; The fourth lens (L4) and the seventh lens (L7) are both biconvex lenses; The fifth lens (L5) is a meniscus lens; The sixth lens (L6) is a lens with a convex image side surface; The eighth lens (L8) is a lens with a concave object-side surface; The ninth lens (L9) is a meniscus lens or a lens with a convex object-side surface.

2. The optical lens according to claim 1, wherein: It also includes a stop (STO), which is located between the fourth lens (L4) and the fifth lens (L5) or between the fifth lens (L5) and the sixth lens (L6).

3. The optical lens according to claim 2, wherein: The entire focal length FB of the rear aperture lens group of the optical lens and the total effective focal length F of the optical lens satisfy the following relationship: 1.6≤FB / F≤2.

5.

4. The optical lens according to claim 2, wherein: The total optical length TTL of the optical lens and the distance Ts between the image side surface of the preceding lens of the stop (STO) and the stop (STO) on the optical axis satisfy the following relationship: 0≤Ts / TTL≤0.

2.

5. The optical lens according to any one of claims 1 to 2, characterized in that: The effective focal length F1 of the first lens (L1) and the total effective focal length F of the optical lens satisfy the following relationship: -3.2≤F1 / F≤-1.

5.

6. The optical lens according to any one of claims 1 to 2, characterized in that: The effective focal length F2 of the second lens (L2) and the total effective focal length F of the optical lens satisfy the following relationship: -17.7≤F2 / F≤-3.

4.

7. The optical lens according to any one of claims 1 to 2, characterized in that: The central curvature radius R21 of the object side surface of the second lens (L2), the central curvature radius R22 of the image side surface of the second lens (L2), and the total effective focal length F of the optical lens satisfy the following relationship: -0.1≤F / (R21+R22)≤0.

6.

8. The optical lens according to any one of claims 1 to 2, characterized in that: The central curvature radius R31 of the object side surface of the third lens (L3), the central curvature radius R32 of the image side surface of the third lens (L3), and the total effective focal length F of the optical lens satisfy the following relationship: 0≤F / (R31+R32)≤1.

8.

9. The optical lens according to any one of claims 1 to 2, 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: 1.2≤F4 / F≤4.

6.

10. The optical lens according to any one of claims 1 to 2, characterized in that: The central curvature radius R51 of the object side surface of the fifth lens (L5), the central curvature radius R52 of the image side surface of the fifth lens (L5), and the total effective focal length F of the optical lens satisfy the following relationship: -0.3≤F / (R51+R52)≤0.

11. The optical lens according to any one of claims 1 to 2, 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: 2.0≤F6 / F≤4.

3.

12. The optical lens according to any one of claims 1 to 2, characterized in that: The effective focal length F7 of the seventh lens (L7) and the effective focal length F of the optical lens satisfy the following relationship: 1.4≤F7 / F≤2.

0.

13. The optical lens according to any one of claims 1 to 2, characterized in that: The distance T67 between the sixth lens (L6) and the seventh lens (L7) on the optical axis and the effective focal length F of the optical lens satisfy the following relationship: 0≤T67 / F≤0.

5.

14. The optical lens according to any one of claims 1 to 2, characterized in that: The distance T89 between the eighth lens (L8) and the ninth lens (L9) on the optical axis and the total optical length TTL of the optical lens satisfy the following relationship: 0≤T89 / TTL≤0.

6.

15. The optical lens according to any one of claims 1 to 2, characterized in that: The effective focal length F8 of the eighth lens (L8) and the total effective focal length F of the optical lens satisfy the following relationship: -1.8≤F8 / F≤-1.

0.

16. The optical lens according to any one of claims 1 to 2, characterized in that: The effective focal length F9 of the ninth lens (L9) and the total effective focal length F of the optical lens satisfy the following relationship: 2.5≤F9 / F≤7.

0.

17. The optical lens according to any one of claims 1 to 2, characterized in that: The back focal length BFL of the optical lens and the total effective focal length F of the optical lens satisfy the following relationship: 1.0≤BFL / F≤1.

5.

18. The optical lens according to any one of claims 1 to 2, characterized in that: The total effective focal length F of the optical lens and the total optical length TTL of the optical lens satisfy the following relationship: 7.6≤TTL / F≤8.

8.

19. The optical lens according to any one of claims 1 to 2, characterized in that: The total optical length TTL of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy the following relationship: 2.7≤TTL / H≤3.

2.

20. The optical lens according to any one of claims 1 to 2, characterized in that: The maximum clear aperture D of the object side of the first lens (L1) corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the total effective focal length F of the optical lens satisfy the following relationship: 0.4≤D / H / F≤0.

7.

21. The optical lens according to any one of claims 1 to 2, characterized in that: The total effective focal length F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy the following relationship: 1.7≤F / ENPD≤1.

9.

22. The optical lens according to any one of claims 1 to 2, characterized in that: A central thickness dn of the nth lens having the largest central thickness among the first lens (L1) to the ninth lens (L9) and a central thickness dm of the mth lens having the smallest central thickness among the first lens (L1) to the ninth lens (L9) satisfy the following relationship: 4.2≤dn / dm≤6.7.

Images