Optical lens

Abstract

The application provides an optical lens, which comprises nine lenses in sequence along an optical axis from an object side to an imaging surface, and the nine lenses comprise: a first lens with negative optical power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a third lens with positive optical power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens with negative optical power, the object side surface of the fourth lens is a concave surface; a fifth lens with positive optical power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; a sixth lens with negative optical power, the image side surface of the sixth lens is a concave surface; a seventh lens with positive optical power; an eighth lens with negative optical power; and a ninth lens with positive optical power. The optical lens provided by the application has one or more advantages of short focal length, miniaturization, large field of view, large aperture, large target surface, low distortion, low sensitivity and the like through specific surface shape matching and reasonable optical power distribution.

Description

Technical Field

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

[0002] With the rapid development of fields such as drones, security, automobiles, meteorology, medical, VR, and AR, increasingly higher demands are being placed on the field of view of the lenses they are equipped with. Wide-angle lenses, by introducing barrel distortion, compress light at the edges of the field of view as much as possible, thus achieving ultra-wide-angle lenses. Currently, ultra-wide-angle lenses still have many problems. For example, common ultra-wide-angle lenses have relatively small apertures, resulting in insufficient light intake and unclear images in low-light environments. In addition, there are problems such as difficulty in aberration correction, large distortion, and defocusing under high and low temperature conditions. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0004] This invention provides an optical lens comprising nine lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0005] The first lens with negative optical power has a convex object side and a concave image side.

[0006] A second lens with negative optical power has a convex object side and a concave image side.

[0007] A third lens with positive optical power has a convex object-side surface and a concave image-side surface.

[0008] The fourth lens has negative optical power and its object side is concave.

[0009] The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0010] The sixth lens has negative optical power and its image-side surface is concave.

[0011] The seventh lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0012] The eighth lens, which has negative optical power, has an image-side surface that is concave near the optical axis.

[0013] The ninth lens with positive optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis.

[0014] Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.4 <TTL / f<6.6。

[0015] Further preferably, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 <IH / f<3.1。

[0016] Further preferably, the total optical length (TTL) of the optical lens and the aperture value (Fno) of the optical lens satisfy: 6.4mm. <TTL / Fno<8.2mm。

[0017] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.8 <f1 / f<-2.8。

[0018] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -23 <f2 / f<-8。

[0019] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.8 <f6 / f<-1.5。

[0020] Further preferably, the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: 4.9 <f9 / f<7.4。

[0021] Further preferably, the half-aperture R5 of the object-side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.6 <R5 / f<1.3。

[0022] Further preferably, the object-side aperture CSD11 of the first lens and the image-side aperture CSD92 of the ninth lens satisfy: 3.1 <CSD11 / CSD92<3.6。

[0023] Further preferably, the object-side light-transmitting half-aperture height SAG91 of the ninth lens, the image-side light-transmitting half-aperture height SAG92 of the ninth lens, and the center thickness CT9 of the ninth lens satisfy: -3.5<(SAG91+SAG92) / CT9<-1.6.

[0024] Compared with existing technologies, the optical lens provided by this invention uses nine lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens. This allows the lens to have one or more advantages such as short focal length, miniaturization, large field of view, large aperture, large target surface, low distortion, and low sensitivity. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0027] Figure 2 This is an F-Theta distortion curve of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0031] Figure 6 This is the F-Theta distortion curve of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 7 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 8 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 9 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0035] Figure 10 This is the F-Theta distortion curve of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 11 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 12 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0038] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0039] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] The optical lens provided by the embodiment of the present invention has a total of nine lenses. The optical lens sequentially includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens along the optical axis from the object side to the imaging surface.

[0047] In some embodiments, the first lens may have a negative optical power. Its object side is convex, and its image side is concave. The second lens may have a negative optical power. Its object side is convex, and its image side is concave. The third lens may have a positive optical power. Its object side is convex, and its image side is concave. The fourth lens may have a negative optical power. Its object side is concave, and its image side may be concave or convex. The fifth lens may have a positive optical power. Its object side is convex, and its image side is convex. The sixth lens may have a negative optical power. Its object side may be concave or convex, and its image side is concave. The seventh lens may have a positive optical power. Its object side is convex, and its image side is convex. The eighth lens may have a negative optical power. Its object side may be concave or convex, and its image side is concave near the optical axis. The ninth lens may have a positive optical power. Its object side is convex near the optical axis, and its image side is concave near the optical axis.

[0048] In some embodiments, the optical lens may further include an aperture. The aperture may be located between the fourth lens and the fifth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image. When the aperture is located between the fourth lens and the fifth lens, it is convenient for correcting the aperture aberration.

[0049] In some embodiments, the optical lens may further include a filter. The filter is provided between the ninth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0050] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.4 < TTL / f < 6.6. Satisfying the above conditional formula can reasonably configure the ratio of the total optical length to the effective focal length of the optical lens, which is beneficial to realizing the miniaturization design of the optical lens. At the same time, it is also beneficial for the optical lens to have a reasonable field angle range while realizing a certain focal length characteristic, so as to meet the wide-angle design of the optical lens and enable the optical lens to obtain sufficient object-side space information.

[0051] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < IH / f < 3.1. Satisfying the above conditional formula, controlling the ratio of the effective focal length to the image height of the optical lens, shortening the effective focal length can expand the field angle, enabling the optical lens to photograph a wider object-side space, and at the same time can ensure matching a chip with a large image surface, that is, enabling the optical lens to have the characteristics of a large field angle and a large image surface at the same time.

[0052] In some embodiments, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 6.4 mm < TTL / Fno < 8.2 mm. By satisfying the above conditional formula, by controlling the relationship between the total length and the aperture value of the optical lens, it is ensured that the optical lens can meet the requirements of large aperture and miniaturization design, enabling the optical lens to obtain sufficient light transmission in a dim environment and meeting the needs of high-quality and high-definition shooting.

[0053] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.8 < f1 / f < -2.8. By satisfying the above conditional formula, setting the first lens of the optical lens as a lens with a negative optical power can capture the light rays entering the optical lens at a large angle, expand the field angle range of the optical lens, and at the same time is beneficial to reducing the sensitivity of the optical lens and realizing the miniaturization design of the optical lens.

[0054] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -23 < f / p < -8. By satisfying the above conditional formula, reasonably controlling the focal length value of the second lens makes the light divergence increase slowly, which is beneficial to realizing a large aperture and a large target surface. At the same time, it is beneficial to the gentle trend of the light rays, reducing the generation of aberration, and is beneficial to realizing high image quality and ensuring tolerance performance.

[0055] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.8 < f6 / f < -1.5. By satisfying the above conditional formula, reasonably controlling the focal length value of the sixth lens makes the light rays in the large field of view rise slowly, changing the parallel light trend of the light beam into a divergent trend, which is beneficial to controlling the back focal length of the lens and is beneficial to realizing a large target surface and reducing the incident angle of the chief ray.

[0056] In some embodiments, the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: 4.9 < f9 / f < 7.4. By satisfying the above conditional formula, reasonably controlling the focal length value of the ninth lens, the light beam changes from a divergent trend to a focused trend, reducing the optical path and the aperture of the subsequent lenses, which is beneficial to realizing miniaturization and real-time athermalization functions.

[0057] In some embodiments, the half-aperture R5 of the light passing through the object side of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < R5 / f < 1.3. By satisfying the above conditional formula, such a setting makes the shape of the object side of the third lens convex, causing the light rays passing through the second lens to contract into the subsequent lenses, which can reduce the size of the subsequent lenses, contribute to the miniaturization of the optical lens, and the third lens can effectively reduce the generation of spherical aberration and astigmatism to improve the imaging quality of the optical lens.

[0058] In some embodiments, the clear aperture semi-diameter CSD11 of the object side surface of the first lens and the clear aperture semi-diameter CSD92 of the image side surface of the ninth lens satisfy: 3.1 < CSD11 / CSD92 < 3.6. Meeting the above conditional formula enables the optical lens to have a larger aperture, better achieve large-angle light collection, realize the ultra-wide-angle imaging of the optical lens, and at the same time increase the imaging area of the optical lens to achieve large target surface imaging of the optical lens.

[0059] In some embodiments, the sagittal height SAG91 of the clear aperture semi-diameter of the object side surface of the ninth lens, the sagittal height SAG92 of the clear aperture semi-diameter of the image side surface of the ninth lens, and the central thickness CT9 of the ninth lens satisfy: -3.5 < (SAG91 + SAG92) / CT9 < -1.6. Meeting the above conditional formula is beneficial to controlling the refractive power and thickness of each part of the ninth lens in the direction perpendicular to the optical axis, avoiding the ninth lens being too thick or too thin, reducing the incident angle of light on the object side surface of the ninth lens, and reducing the tolerance sensitivity of the optical lens; at the same time, the ninth lens has multiple anti-curved points, which is beneficial to correcting the distortion and field curvature generated by the object side lens of the ninth lens, and evenly distributing the refractive power of multiple lenses near the imaging surface of the optical lens.

[0060] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.8 < f5 / f < 1.1. Meeting the above conditional formula is beneficial to controlling the angle of light incident on the imaging surface of the optical lens, improving the photosensitive performance of the photosensitive element, and enhancing the resolution; at the same time, it is also beneficial to correcting the aberration generated by the refraction of light by the front lens and ensuring the imaging quality.

[0061] In some embodiments, the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -1.1 < R10 / f < -0.7. Meeting the above conditional formula makes the image side surface of the fifth lens convex, which is beneficial to converging light, does not generate aberration, and is also helpful for the miniaturization of the optical lens.

[0062] In some embodiments, the effective focal length f of the optical lens, the radian value θ of the maximum field angle of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.6 < IH / (f×θ) < 1.2. Meeting the above conditional formula can control the edge distortion of the optical lens, is beneficial to realizing the larger field angle and large image surface characteristics of the optical lens, and at the same time can effectively increase the proportion of the edge field of the optical lens in the entire image surface, making the optical lens meet the high pixel characteristics and improving the imaging quality of the optical lens.

[0063] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -16 < (R7 + R8) / (R7 - R8) < -0.7. By satisfying the above conditional formula, the surface shapes of the object side surface and the image side surface of the fourth lens are controlled, effectively correcting the spherical aberration of the optical lens, while reducing the influence of astigmatism on the imaging of the optical lens. In addition, the effective aperture in the optical path can be increased, enabling the optical lens to have a large field angle and be ultrathin.

[0064] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the sagittal height SAG11 of the clear aperture radius of the object side surface of the first lens satisfy: 3.8 < R1 / SAG11 < 5.2. By satisfying the above conditional formula, by controlling the ratio relationship between the radius of curvature of the object side surface of the first lens and the sagittal height of the object side surface, a negative refractive power is provided for the optical lens, thereby capturing the light rays that enter the optical lens at large angles and expanding the field angle range of the optical lens.

[0065] In some embodiments, the optical lens satisfies the following conditional formula: 2 mm < f < 2.8 mm; 150° ≤ FOV < 210°; 1 mm < EPD < 1.5 mm; 12 mm < TTL < 13.2 mm; 1.5 < Fno < 1.9; 5.9 mm < IH < 6.2 mm; where f represents the effective focal length of the optical lens, FOV represents the maximum field angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the image height corresponding to the maximum field angle of the optical lens. By satisfying the above conditional formula, the optical lens has at least one or more advantages such as a short focal length, a large field angle, a large entrance pupil diameter, a short total length, a large aperture, a large target surface, low distortion, and low sensitivity.

[0066] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The first lens and the fourth lens in the optical lens provided by the present invention can adopt glass materials, and the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens can adopt plastic materials. By adopting a glass-plastic hybrid structure, the cost can be effectively reduced, the aberration can be corrected, the volume can be reduced, the thermal stability performance can be improved, and an optical lens product with higher cost performance can be provided.

[0067] In some embodiments, the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first and fourth lenses of this invention are spherical lenses; the second, third, fifth, sixth, seventh, eighth, and ninth lenses are aspherical lenses.

[0068] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0069] ;

[0070] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, H, I, and J are the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth, and twentieth order surface coefficients, respectively.

[0071] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0072] Example 1

[0073] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S21, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a filter G1.

[0074] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0075] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0076] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0077] The fourth lens L4 has negative optical power, its object side S7 is concave, and its image side S8 is concave.

[0078] The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side S10 is convex.

[0079] The sixth lens L6 has negative optical power, its object side S11 is convex near the optical axis, and its image side S12 is concave.

[0080] The seventh lens L7 has positive optical power, its object side S13 is convex, and its image side S14 is convex.

[0081] The eighth lens L8 has negative optical power, its object side S15 is convex near the optical axis, and its image side S16 is concave near the optical axis.

[0082] The ninth lens L9 has positive optical power, its object side S17 is convex near the optical axis, and its image side S18 is concave near the optical axis.

[0083] The object-side surface S19 and the image-side surface S20 of filter G1 are both planar.

[0084] The imaging plane S21 is a plane.

[0085] The first lens L1 and the fourth lens L4 are glass spherical lenses; the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are all plastic aspherical lenses.

[0086] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0087] Table 1-1

[0088]

[0089] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0090] Table 1-2

[0091]

[0092] In this embodiment, the F-Theta distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0093] Figure 2 The F-Theta distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion at different field-of-view angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion value is controlled within -10% to 20%, indicating that the optical lens 100 can correct distortion well.

[0094] Figure 3 The field curvature curve of the optical lens 100 in this embodiment is shown, which represents the field curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.1 mm to 0.05 mm, indicating that the optical lens 100 can correct the field curvature well.

[0095] Figure 4 The diagram shows the transverse chromatic aberration curve of the optical lens 100 in this embodiment. It represents the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within 0~5 μm, indicating that the optical lens 100 can effectively correct transverse chromatic aberration.

[0096] Example 2

[0097] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S8 of the fourth lens L4 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; the object side S15 of the eighth lens L8 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0098] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0099] Table 2-1

[0100]

[0101] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0102] Table 2-2

[0103]

[0104] In this embodiment, the F-Theta distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0105] from Figure 6 As can be seen, the distortion value is controlled within -40% to 0, indicating that the optical lens 200 can correct distortion well.

[0106] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0107] from Figure 8 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 5μm, indicating that the optical lens 200 can effectively correct transverse chromatic aberration.

[0108] Example 3

[0109] Please see Figure 9 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S8 of the fourth lens L4 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; the object side S15 of the eighth lens L8 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0111] Table 3-1

[0112]

[0113] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0114] Table 3-2

[0115]

[0116] In this embodiment, the F-Theta distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0117] from Figure 10 As can be seen, the distortion value is controlled within -30% to 0, indicating that the optical lens 300 can correct distortion well.

[0118] from Figure 11 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.15mm to 0.1mm, indicating that the optical lens 300 can correct the field curvature well.

[0119] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -3μm to 5μm, indicating that the optical lens 300 can effectively correct transverse chromatic aberration.

[0120] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0121] Table 4

[0122]

[0123] In summary, the optical lens provided by the present invention uses nine lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens. This allows the lens to have one or more advantages such as short focal length, miniaturization, large field of view, large aperture, large target surface, low distortion, and low sensitivity.

[0124] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0125] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens, comprising nine pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a third lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a fourth lens with negative refractive power, the object side surface of which is a concave surface; a fifth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a sixth lens with negative refractive power, the image side surface of which is a concave surface; a seventh lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; an eighth lens with negative refractive power, the image side surface of which is a concave surface at the near optical axis; a ninth lens with positive refractive power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface at the near optical axis; wherein the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.4 < TTL / f < 6.

6.

2. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < IH / f < 3.

1.

3. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 6.4 mm < TTL / Fno < 8.2 mm.

4. The optical lens of claim 1, wherein, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.8 < f1 / f < -2.

8.

5. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -23 < f2 / f < -8.

6. The optical lens of claim 1, wherein, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.8 < f6 / f < -1.

5.

7. The optical lens of claim 1, wherein, The focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: 4.9 < f9 / f < 7.

4.

8. The optical lens of claim 1, wherein, The object side surface half light entrance radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < R5 / f < 1.

3.

9. The optical lens of claim 1, wherein, The object side surface half light entrance radius CSD11 of the first lens and the image side surface half light entrance radius CSD92 of the ninth lens satisfy: 3.1 < CSD11 / CSD92 < 3.

6.

10. The optical lens of claim 1, wherein, The object side surface half light entrance radius sag91 of the ninth lens, the image side surface half light entrance radius sag92 of the ninth lens, and the central thickness CT9 of the ninth lens satisfy: -3.5 < (SAG91+SAG92) / CT9 < -1.6.

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