Optical lens

Abstract

This invention provides an optical lens comprising nine lenses, arranged sequentially along the optical axis from the object side to the image plane: a first lens with negative optical power, its object side being convex and its image side being concave; a second lens with negative optical power, its object side being convex and its image side being concave; a third lens with positive optical power, its object side being convex and its image side being concave; a fourth lens with positive optical power, its image side being convex; a fifth lens with positive optical power, its object side being convex and its image side being convex; a sixth lens with negative optical power, its image side being concave; a seventh lens with positive optical power; an eighth lens with positive optical power; and a ninth lens with negative optical power. The optical lens provided by this invention, through specific surface shape combinations and a reasonable distribution of optical power, enables the lens to possess one or more advantages such as short focal length, miniaturization, large field of view, large aperture, large image surface, low distortion, and low sensitivity.

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 positive optical power and its image-side surface is convex.

[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 positive optical power, has a convex image-side surface;

[0013] The ninth lens, which has negative optical power, has an image-side surface that is concave near the optical axis.

[0014] Wherein, the effective focal length f of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.8 <IH / (f×θ)<1.1。

[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: 3.1 <IH / f<3.2。

[0016] Further preferably, the effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 1.2mm <f / Fno<1.4mm。

[0017] Further preferably, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 1.6 <TTL / IH<1.9。

[0018] Further preferably, the total optical length TTL of the optical lens and the sum of the center thicknesses along the optical axis of the first lens to the ninth lens, ∑CT, satisfy: 1.6 <TTL / ∑CT<1.8。

[0019] Further preferably, the half-aperture R18 of the image-side surface of the ninth lens and the focal length f9 of the ninth lens satisfy: -1.5 <R18 / f9<-0.15。

[0020] Further preferably, the half-aperture CSD11 of the object-side surface of the first lens and the half-aperture CSD81 of the object-side surface of the eighth lens satisfy: 3.1 <CSD11 / CSD81<4.1。

[0021] Further preferably, the focal length f1 of the first lens, the object-side radius of curvature R1 of the first lens, and the image-side radius of curvature R2 of the first lens satisfy: -0.5 <f1 / (R1+R2)<-0.2。

[0022] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.6 <f1 / f<-2.4。

[0023] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -39 <f2 / f<-14。

[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 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, along the optical axis from the object side to the imaging surface: 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.

[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 positive optical power, its object side may be concave or convex, and its image side is 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 positive optical power, its object side may be concave or convex, and its image side is convex. The ninth 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.

[0048] In some embodiments, the optical lens may further include an aperture, and 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 the correction of aperture aberration.

[0049] In some embodiments, the optical lens may further include a filter, and the filter is disposed 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 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: 0.8 < IH / (f×θ) < 1.1. Satisfying the above conditional formula is beneficial to realizing the characteristics of a large field angle and a large image surface 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, enable the optical lens to meet the high-pixel characteristics, and can also control the edge distortion of the optical lens to improve the imaging quality of the optical lens.

[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: 3.1 < IH / f < 3.2. 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 capture a wider object-side space, and at the same time enabling the optical lens to match a chip with a large image surface to improve the imaging quality of the optical lens.

[0052] In some embodiments, the effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 1.2 mm < f / Fno < 1.4 mm. Meeting the above conditional formula is conducive to the optical lens obtaining the characteristic of a large aperture, enabling the optical lens to have sufficient light input, which is thus conducive to making the captured image clearer; at the same time, the short focal length combined with the large aperture enables the optical lens to have a large wide-angle field of view to capture more scene information, and at the same time solves the problem of low-light shooting through the large aperture, and strengthens the sense of hierarchy of the picture with flexible depth-of-field control.

[0053] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.6 < TTL / IH < 1.9. Meeting the above conditional formula and reasonably configuring the overall optical length and image height of the optical lens can effectively shorten the overall optical length of the optical lens while ensuring that the optical lens has high pixels, enabling the optical lens to meet the requirements of miniaturization while having high imaging quality.

[0054] In some embodiments, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the ninth lens along the optical axis satisfy: 1.6 < TTL / ∑CT < 1.8. Meeting the above conditional formula and reasonably configuring the overall optical length of the optical lens and the sum of the thicknesses of each lens helps to achieve the characteristic of high pixels and improve the imaging quality of the optical lens; at the same time, it can effectively shorten the overall optical length of the optical lens to meet the design requirements of miniaturization and light weight.

[0055] In some embodiments, the image-side clear aperture radius R18 of the ninth lens and the focal length f9 of the ninth lens satisfy: -1.5 < R18 / f9 < -0.15. Meeting the above conditional formula and reasonably controlling the curvature radius of the image side of the ninth lens and the effective focal length of the ninth lens can effectively suppress the exit angle of the light passing through the ninth lens, reduce the angle of the chief ray, so as to better match the chip, improve the tolerance and manufacturability of the optical lens, and improve the resolution of the optical lens. [[ID=

[10] ]

[0056] In some embodiments, the object-side clear aperture radius CSD11 of the first lens and the object-side clear aperture radius CSD81 of the eighth lens satisfy: 3.1 < CSD11 / CSD81 < 4.1. Meeting the above conditional formula enables the optical lens to have a larger aperture, which can better achieve the collection of large-angle light, realize the ultra-wide-angle imaging of the optical lens, and at the same time can increase the imaging area of the optical lens to realize the large target surface imaging of the optical lens.

[0057] In some embodiments, the focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -0.5 < f1 / (R1 + R2) < -0.2. Satisfying the above conditional formula can constrain the surface profiles of the object side and image side of the first lens, which is beneficial to reducing the bending degree of light rays at the image side surface of the first lens, reducing the astigmatism amount of the optical lens, so as to balance the astigmatism problem brought by the large field angle of the optical lens, ensuring that the astigmatism of the optical lens is not too large while having a large field of view, and further ensuring that the optical lens has excellent imaging quality.

[0058] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.6 < f1 / f < -2.4. Satisfying the above conditional formula and 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, expanding the field angle range of the optical lens; at the same time, it is also beneficial to reducing the sensitivity of the optical lens and realizing the miniaturized design of the optical lens.

[0059] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -39 < f2 / f < -14. Satisfying the above conditional formula and reasonably controlling the focal length value of the second lens can cause the light beam entering the optical lens to diverge, slowly increasing the large field of view light rays, which is beneficial to realizing a large aperture and a large target surface, and at the same time is beneficial to the gentle trend of light rays, reducing the generation of aberrations, being beneficial to realizing high image quality and ensuring tolerance performance.

[0060] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.9 < f4 / f < 3.3. Satisfying the above conditional formula and reasonably configuring the effective focal length of the fourth lens is beneficial to correcting the spherical aberration of the optical lens and improving the resolving power of the optical lens.

[0061] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.7 < f5 / f < 2. Satisfying the above conditional formula is thus beneficial to controlling the angle of light rays 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 aberrations generated by the refraction of light rays by the previous lenses and ensuring the imaging quality.

[0062] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -3.1 < f6 / f < -1.8. Satisfying the above conditional formula and reasonably controlling the focal length value of the sixth lens can slowly lift the large field of view light rays and change them into a divergent trend, which is beneficial to controlling the back focal length of the lens, being beneficial to realizing a large target surface and reducing the incident angle of the chief ray.

[0063] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 4.5 < R1 / f < 7.5. Satisfying the above conditional formula is beneficial to expanding the field angle of the optical lens and maintaining the astigmatism of the first lens within a reasonable range, so that the optical lens has good imaging quality.

[0064] In some embodiments, the central thickness CT2 of the second lens, the central thickness CT3 of the third lens, and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 1 < (CT2 + CT3) / CT23 < 1.4. Satisfying the above conditional formula is beneficial to shortening the total length of the optical lens by reasonably controlling the ratio of the sum of the thicknesses of the second lens and the third lens on the optical axis to the distance between the second lens and the third lens on the optical axis, making the structure of the optical lens more compact.

[0065] In some embodiments, the optical lens satisfies the following conditional formula: 2 mm < f < 2.5 mm; 180° ≤ FOV ≤ 210°; 1.2 mm < EPD < 1.4 mm; 10 mm < TTL < 14.5 mm; 1.6 < Fno < 1.8; 6.5 mm < IH < 7.6 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. Satisfying the above conditional formula, the optical lens has at least one or more advantages such as short focal length, large field angle, large entrance pupil diameter, short total length, large aperture, 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. Adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce volume, improve thermal stability performance, and provide an optical lens product with higher cost performance.

[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 plane 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 positive optical power, its object side S7 is convex, and its image side S8 is convex.

[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 positive optical power, its object side S15 is concave, and its image side S16 is convex.

[0082] The ninth lens L9 has negative 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]

[0090] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0091] Table 1-2

[0092] S3 -8.93E-01 1.96E-03 -1.12E-02 1.49E-03 4.43E-06 S4 -9.10E-01 -2.44E-02 -2.35E-02 9.52E-03 -1.19E-03 S5 0.00E+00 1.28E-03 2.66E-03 -3.66E-04 -2.03E-04 S6 0.00E+00 2.77E-02 6.95E-03 -2.53E-04 -2.91E-03 S9 2.19E+00 3.99E-03 8.92E-03 1.80E-02 -4.74E-02 S10 7.56E+00 -3.05E-04 6.46E-02 -4.90E-02 -8.42E-02 S11 0.00E+00 -1.05E-01 1.85E-01 -2.12E-01 1.32E-02 S12 -5.64E-01 -1.04E-01 1.20E-01 -1.00E-01 2.70E-02 S13 0.00E+00 -3.83E-02 3.87E-02 -2.39E-02 6.97E-03 S14 1.01E+01 -1.74E-01 4.06E-02 1.73E-02 -1.35E-02 S15 0.00E+00 -9.39E-02 1.04E-02 0.00E+00 0.00E+00 S16 0.00E+00 5.05E-02 -3.46E-02 6.67E-03 0.00E+00 S17 0.00E+00 -1.26E-01 2.05E-02 -2.81E-02 4.06E-03 S18 0.00E+00 -1.05E-01 5.37E-03 -7.31E-04 1.83E-03 Face number F G H I J S3 -8.70E-06 -1.60E-06 1.47E-07 1.87E-08 -1.62E-09 S4 1.82E-04 -6.28E-05 1.08E-05 0.00E+00 0.00E+00 S5 -6.44E-05 1.47E-05 7.26E-07 0.00E+00 0.00E+00 S6 3.11E-04 2.24E-04 -4.11E-05 0.00E+00 0.00E+00 S9 6.15E-02 -3.76E-02 9.47E-03 0.00E+00 0.00E+00 S10 2.05E-01 -1.55E-01 4.21E-02 0.00E+00 0.00E+00 S11 1.90E-01 -1.68E-01 4.54E-02 0.00E+00 0.00E+00 S12 2.36E-02 -2.08E-02 4.67E-03 0.00E+00 0.00E+00 S13 -1.16E-03 1.09E-03 -3.77E-04 0.00E+00 0.00E+00 S14 6.51E-03 -3.77E-03 1.02E-03 0.00E+00 0.00E+00 S15 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S17 1.09E-02 -5.87E-03 2.96E-04 3.74E-04 -6.13E-05 S18 -7.39E-04 8.95E-06 4.89E-05 -1.03E-05 6.76E-07

[0093] 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.

[0094] 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 -20% to 0, indicating that the optical lens 100 can correct distortion well.

[0095] 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 ±0.05 mm, indicating that the optical lens 100 can correct the field curvature well.

[0096] 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 -3 μm to 4 μm, indicating that the optical lens 100 can effectively correct transverse chromatic aberration.

[0097] Example 2

[0098] 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 object side surface S11 of the sixth lens L6 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0099] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0100] Table 2-1

[0101]

[0102]

[0103] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0104] Table 2-2

[0105]

[0106]

[0107] 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.

[0108] from Figure 6 As can be seen, the distortion value is controlled within ±10%, indicating that the optical lens 200 can correct distortion well.

[0109] 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.

[0110] from Figure 8 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2μm to 4μm, indicating that the optical lens 200 can effectively correct transverse chromatic aberration.

[0111] Example 3

[0112] 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 object-side surface S7 of the fourth lens L4 is concave; the object-side surface S15 of the eighth lens L8 is convex; the object-side surface S17 of the ninth lens L9 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0113] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0114] Table 3-1

[0115]

[0116]

[0117] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0118] Table 3-2

[0119] S3 -9.60E-01 2.46E-02 -1.58E-02 1.22E-03 1.88E-05 S4 -9.21E-01 3.02E-02 -4.18E-02 1.15E-02 -2.05E-03 S5 0.00E+00 6.67E-03 1.84E-03 8.36E-06 1.34E-05 S6 0.00E+00 2.52E-02 3.55E-03 5.24E-04 -1.45E-03 S9 1.12E+00 -5.12E-04 -1.82E-03 2.19E-02 -4.99E-02 S10 3.05E+01 -7.43E-02 1.21E-01 -5.04E-02 -1.15E-01 S11 0.00E+00 -2.03E-01 2.30E-01 -1.58E-01 -5.49E-02 S12 -2.42E+00 -1.15E-01 1.47E-01 -1.07E-01 2.27E-02 S13 0.00E+00 -6.38E-03 2.74E-02 -2.22E-02 1.16E-02 S14 1.59E+01 -1.45E-01 7.85E-02 -2.00E-02 -5.45E-03 S15 0.00E+00 -1.72E-01 -4.93E-03 0.00E+00 0.00E+00 S16 0.00E+00 4.91E-02 -6.23E-02 1.28E-02 0.00E+00 S17 0.00E+00 1.02E-02 1.15E-02 -2.79E-02 3.00E-03 S18 0.00E+00 -6.54E-02 1.16E-02 -5.43E-03 2.78E-03 Face number F G H I J S3 -5.77E-06 -1.26E-06 1.68E-07 1.82E-08 -2.36E-09 S4 2.63E-04 -4.36E-05 3.74E-06 0.00E+00 0.00E+00 S5 -3.43E-05 4.97E-06 -5.43E-07 0.00E+00 0.00E+00 S6 2.35E-04 3.81E-05 -2.75E-06 0.00E+00 0.00E+00 S9 5.75E-02 -3.23E-02 7.34E-03 0.00E+00 0.00E+00 S10 2.03E-01 -1.29E-01 3.02E-02 0.00E+00 0.00E+00 S11 1.81E-01 -1.23E-01 2.88E-02 0.00E+00 0.00E+00 S12 2.35E-02 -1.81E-02 3.73E-03 0.00E+00 0.00E+00 S13 -1.86E-03 -3.02E-04 1.07E-04 0.00E+00 0.00E+00 S14 9.95E-03 -5.17E-03 1.21E-03 0.00E+00 0.00E+00 S15 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S17 9.75E-03 -5.47E-03 4.96E-04 3.35E-04 -7.21E-05 S18 -7.05E-04 -1.63E-05 4.89E-05 -9.75E-06 6.30E-07

[0120] 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 12As shown.

[0121] from Figure 10 As can be seen, the distortion value is controlled within ±10%, indicating that the optical lens 300 can correct distortion well.

[0122] from Figure 11 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens 300 can effectively correct the field curvature.

[0123] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2μm to 5μm, indicating that the optical lens 300 can effectively correct transverse chromatic aberration.

[0124] 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.

[0125] Table 4

[0126] f(mm) 2.071 2.428 2.070 EPD (mm) 1.255 1.364 1.254 TTL(mm) 11.386 14.092 10.681 Fno 1.650 1.780 1.650 IH(mm) 6.599 7.597 6.599 CRA(°) 41.133 37.1004 41.0446 FOV (°) 210.000 190.000 180.000 IH / (f×θ) 0.869 0.944 1.015 IH / f 3.186 3.130 3.189 f / Fno(mm) 1.255 1.364 1.254 TTL / IH 1.726 1.855 1.618 TTL / ∑CT 1.781 1.640 1.766 R18 / f9 -0.248 -0.182 -1.473 CSD11 / CSD81 4.028 3.176 3.285 f1 / (R1+R2) -0.368 -0.271 -0.400 f1 / f -2.550 -2.404 -2.403 f2 / f -38.157 -19.246 -14.312 f4 / f 2.000 2.206 3.275 f5 / f 1.901 1.753 1.801 f6 / f -2.243 -1.825 -3.015 R1 / f 5.457 7.331 4.648 (CT2+CT3) / CT23 1.057 1.371 1.155

[0127] 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.

[0128] 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.

[0129] 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 lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a convex object side and a concave image side. A second lens with negative optical power has a convex object side and a concave image side. A third lens with positive optical power has a convex object-side surface and a concave image-side surface. The fourth lens has positive optical power and its image-side surface is convex. The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface. The sixth lens has negative optical power and its image-side surface is concave. The seventh lens with positive optical power has a convex object-side surface and a convex image-side surface. The eighth lens, which has positive optical power, has a convex image-side surface; The ninth lens, which has negative optical power, has an image-side surface that is concave near the optical axis. Wherein, the effective focal length f of the optical lens, the radian value θ of the maximum field of view of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.8 <IH / (f×θ)<1.1; The half-aperture CSD11 of the object-side surface of the first lens and the half-aperture CSD81 of the object-side surface of the eighth lens satisfy: 3.1 <CSD11 / CSD81<4.1; The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -39 <f2 / f<-14。 2. The optical lens according to claim 1, characterized in that, 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: 3.1 <IH / f<3.2。 3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 1.2mm <f / Fno<1.4mm。 4. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 1.6 <TTL / IH<1.9。 5. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the sum of the center thicknesses along the optical axis of the first lens to the ninth lens, ∑CT, satisfy: 1.6 <TTL / ∑CT<1.8。 6. The optical lens according to claim 1, characterized in that, The radius of curvature R18 of the image-side surface of the ninth lens and the focal length f9 of the ninth lens satisfy: -1.5 <R18 / f9<-0.15。 7. The optical lens according to claim 1, characterized in that, The focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.9 <f4 / f<3.3。 8. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R2 of the image side of the first lens satisfy: -0.5 <f1 / (R1+R2)<-0.2。 9. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.6 <f1 / f<-2.4。 10. The optical lens according to claim 1, characterized in that, The focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.7 <f5 / f<2。

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