Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a concave surface; the third lens has positive focal power, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens near the optical axis is a convex surface; the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface near the optical axis, and the image side surface of the sixth lens is a concave surface; and the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of ultra-wide angle, high pixel, large aperture, high illumination, high imaging quality and the like.

Description

Technical Field

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

[0002] As security monitoring upgrades towards full-scene coverage and high-definition monitoring, higher demands are placed on the field of view of surveillance lenses, whether it's panoramic monitoring of urban roads, perimeter protection without blind spots in parks, or real-time observation of large indoor spaces (such as shopping malls and stadiums). To meet the demand for a wide field of view, wide-angle lenses in the monitoring field, by introducing barrel distortion to compress light at the edges of the field of view, can effectively reduce blind spots and the number of devices deployed. However, current ultra-wide-angle surveillance lenses still have significant shortcomings: common products have small apertures, which can easily lead to insufficient light intake, high image noise, and blurred details in low-light environments such as at night and underground parking garages, affecting monitoring accuracy; at the same time, due to the need to adapt to an ultra-wide field of view, the difficulty of lens aberration correction increases significantly, which can easily lead to image edge distortion, and in order to accommodate multiple optical lenses, the lens head size is generally large, making it difficult to adapt to miniaturized monitoring equipment or narrow installation scenarios.

[0003] Therefore, it is necessary to provide optical lenses with advantages such as wide angle, high resolution, and high illumination to meet the needs of consumers. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] This invention provides an optical lens comprising seven lenses with optical power, arranged sequentially along the optical axis from the object side to the imaging plane:

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

[0007] A second lens with negative optical power has a concave object side.

[0008] The third lens with positive optical power has a convex image-side surface;

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

[0010] The fifth lens with positive optical power has a concave object side and a convex image side near the optical axis.

[0011] The sixth lens with negative optical power has an object-side surface that is concave near the optical axis and an image-side surface that is concave.

[0012] The seventh lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0013] Among them, 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: 2.1 < IH / f < 2.3; the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 85° < FOV / Fno < 90°.

[0014] Further preferably, the overall optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 13mm < TTL / Fno < 14mm.

[0015] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4 < f1 / f < -1.2; the curvature radius 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: 210 < R1 / SAG11 < 390.

[0016] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < f3 / f < 2.6.

[0017] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.2 < f4 / f < 3.6.

[0018] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.7 < f6 / f < -0.8.

[0019] Further preferably, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.1 < f7 / f < 2.5.

[0020] Further preferably, the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.2 < f4567 / f < 2.5.

[0021] Further preferably, the clear aperture radius CSD11 of the object side surface of the first lens and the clear aperture radius CSD71 of the object side surface of the seventh lens satisfy: 1.3 < CSD11 / CSD71 < 1.4.

[0022] Further preferably, the clear aperture radius CSD72 of the image side surface of the seventh lens and the sagittal height SAG72 of the clear aperture radius of the image side surface of the seventh lens satisfy: -4.1 < CSD72 / SAG72 < -2.4.

[0023] Compared with existing technologies, the optical lens provided by this invention uses seven 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, giving the lens one or more advantages such as ultra-wide angle, high pixel count, large aperture, high illumination, and high imaging quality. Attached Figure Description

[0024] 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:

[0025] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0026] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 4 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 5 This is a relative illumination curve of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 6 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0031] Figure 7 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 8 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 9 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 10 This is a relative illumination curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 13 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 14 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 15 This is a relative illumination curve of the optical lens in Embodiment 3 of the present invention.

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The optical lens provided in this embodiment of the invention has seven lenses with optical power. The optical lens includes, in sequence along the optical axis from the object side to the imaging plane: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0049] In some embodiments, the first lens may have negative optical power, with a convex object-side surface and a concave image-side surface. The second lens may have negative optical power, with a concave object-side surface and either a concave or convex image-side surface. The third lens may have positive optical power, with either a concave or convex object-side surface and a convex image-side surface. The fourth lens may have positive optical power, with both a convex object-side surface and a convex image-side surface. The fifth lens may have positive optical power, with a concave object-side surface and a convex image-side surface near the optical axis. The sixth lens may have negative optical power, with both a concave object-side surface near the optical axis and a concave image-side surface. The seventh lens may have positive optical power, with both a convex object-side surface and a convex image-side surface.

[0050] In some embodiments, the optical lens may also include an aperture stop, which may be located between the third and fourth lenses. It is understood that the aperture stop is used to limit the amount of light entering the lens to change the brightness of the image. When the aperture stop is located between the third and fourth lenses, it facilitates the correction of aperture aberrations.

[0051] In some embodiments, the optical lens may further include a filter disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0052] 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: 2.1 < IH / f < 2.3. By 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, increasing the width of the light beam entering the optical lens, enhancing the brightness at the image plane of the optical lens to avoid vignetting; at the same time, endowing the optical lens with large image plane characteristics, matching with a large image plane chip to improve the resolution and ensuring the imaging quality of the optical lens.

[0053] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 85° < FOV / Fno < 90°. By satisfying the above conditional formula, it can ensure that the optical lens meets a certain large field angle, reduce the influence of off-axis aberration on the system, and at the same time ensure the improvement of the brightness of the imaging surface, thereby improving the imaging quality.

[0054] In some embodiments, the overall optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 13mm < TTL / Fno < 14mm. By satisfying the above conditional formula, by controlling the relationship between the overall length and the aperture value of the optical lens, it is ensured that the optical lens can meet the requirements of large aperture and miniaturized 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.

[0055] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4 < f1 / f < -1.2. By satisfying the above conditional formula, setting the first lens of the optical lens as a lens with negative optical power can capture the light rays entering the optical lens at large angles, 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 miniaturized design of the optical lens.

[0056] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the sagittal height SAG11 of the object side surface clear aperture radius of the first lens satisfy: 210 < R1 / SAG11 < 390. By satisfying the above conditional formula, the ratio relationship between the curvature radius of the object side surface of the first lens and the sagittal height at the maximum effective aperture can be controlled, providing negative refractive power for the optical lens, thereby capturing the light rays entering the optical lens at large angles and expanding the field angle range of the optical lens.

[0057] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < f3 / f < 2.6. By satisfying the above conditional formula, by setting the third lens with a positive optical power and defining the ratio of the focal length of the third lens to the effective focal length of the optical lens, it is beneficial to adjust the light path from the first lens and the second lens, so that the optical lens has certain characteristics of a large field angle, low sensitivity, and miniaturization.

[0058] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2.2 < f4 / f < 3.6. By satisfying the above conditional formula, the optical power provided by the fourth lens for the optical lens can better constrain the light beam, so it can be used to correct the chromatic aberration of the optical lens. At the same time, as the middle lens of the optical lens, the fourth lens can perform intermediate correction on the aberrations generated by the decentration of each lens on the object side and reduce the correction pressure of the subsequent lens group, suppressing the astigmatism generated by the decentration of each lens on the object side.

[0059] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.7 < f6 / f < -0.8. By satisfying the above conditional formula, reasonably controlling the focal length value of the sixth lens makes the light of the large field angle slowly rise, changing the parallel light trend of the light beam into a divergent trend, which is beneficial to controlling the back focus of the lens, beneficial to achieving a large target surface and reducing the main ray incident angle.

[0060] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.1 < f7 / f < 2.5. By satisfying the above conditional formula, the positive optical power provided by the seventh lens for the optical lens can better constrain the rear-end light, so it can effectively correct the chromatic aberration. At the same time, as the lens at the rear-end position in the optical lens, the seventh lens can better correct the aberrations generated by the decentration of each lens on the object side, that is, it can reduce the decentration sensitivity of the optical lens, suppress the astigmatism generated by the decentration of each lens on the object side, thereby realizing the correction of the aberrations of the optical lens and improving the imaging resolution.

[0061] In some embodiments, the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the optical lens satisfy: 2.2 < f4567 / f < 2.5. By satisfying the above conditional formula, the combined rear-group lens of the fourth lens to the seventh lens has a positive optical power, which is beneficial to correcting the chromatic aberration and field curvature of the optical lens, slowing down the light deflection angle, reducing the sensitivity, reducing the lens forming difficulty, and being able to achieve the balance of the overall spherical aberration and obtain good imaging quality for the on-axis field of view.

[0062] In some embodiments, the clear aperture semi-diameter CSD11 of the object side surface of the first lens and the clear aperture semi-diameter CSD71 of the object side surface of the seventh lens satisfy: 1.3 < CSD11 / CSD71 < 1.4. 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-format imaging of the optical lens.

[0063] In some embodiments, the clear aperture semi-diameter CSD72 of the image side surface of the seventh lens and the sagittal height SAG72 of the clear aperture semi-diameter of the image side surface of the seventh lens satisfy: -4.1 < CSD72 / SAG72 < -2.4. Meeting the above conditional formula is beneficial to controlling the surface shape of the edge field of view of the seventh lens and improving the correction ability of various aberrations of the light rays in the edge field of view, thereby improving the imaging quality of the edge field of view of the optical lens.

[0064] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -32 < f2 / f < -2. Meeting the above conditional formula and setting the second lens to have a negative optical power can further control the incident angle of light rays, expand the field angle range of the optical lens, increase the back focal length of the optical lens at the same time, avoid interference between the lens and the photosensitive chip, and is also beneficial to aberration correction, and can further improve the imaging quality of the optical lens.

[0065] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -4.5 < R3 / f < -1.5. Meeting the above conditional formula and reasonably setting the object side surface of the second lens to be concave is beneficial to converging light rays while reducing the deflection angle of light rays, shortening the distance for light rays to reach the next lens, and is beneficial to reducing the total length of the lens.

[0066] In some embodiments, the clear aperture semi-diameter CSD32 of the image side surface of the third lens and the clear aperture semi-diameter CSD41 of the object side surface of the fourth lens satisfy: 1.2 < CSD32 / CSD41 < 1.6. Meeting the above conditional formula and reasonably distributing the maximum effective apertures of the third lens and the fourth lens is beneficial to reducing the step difference between the third lens and the fourth lens, enabling light rays to enter the fourth lens more smoothly.

[0067] In some embodiments, the sagittal height SAG11 of the clear aperture semi-diameter of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0.18 < SAG11 / CT1 < 0.3. Meeting the above conditional formula and controlling the ratio of the sagittal height of the object side surface of the first lens to the central thickness of the first lens on the optical axis can make the surface shape of the object side surface tend to be curved, and at the same time, a larger sagittal height is beneficial for the first lens to collect light rays in a large field of view, realize high angular resolution at the center of the optical lens, and further improve the imaging quality of the central region.

[0068] In some embodiments, the radius of curvature R12 of the image side surface of the sixth lens and the sagittal height SAG62 of the clear aperture semi-diameter of the image side surface of the sixth lens satisfy: 2.5 < R12 / SAG62 < 21. By satisfying the above conditional formula and controlling the ratio of the radius of curvature and the sagittal height of the image side surface of the sixth lens within a reasonable range, the shape of the image side surface of the sixth lens can be better controlled, which is beneficial to minimizing chromatic aberration and spherical aberration to the greatest extent, improving the imaging quality of the optical lens, and is also beneficial to the molding and processing of the sixth lens.

[0069] In some embodiments, the spacing CT12 between the first lens and the second lens on the optical axis, the central thickness CT2 of the second lens, the spacing CT34 between the third lens and the fourth lens on the optical axis, and the central thickness CT3 of the third lens satisfy: 0.8 < (CT12 + CT2) / (CT34 + CT3) < 1.4. By satisfying the above conditional formula, it is beneficial to correct the aberration of the optical lens, improve the imaging resolution of the optical lens, and at the same time is beneficial to ensuring the compactness of the overall structure of the optical lens and meeting the design requirements of miniaturization.

[0070] In some embodiments, the optical lens satisfies the following conditional formula: 3.9 mm < f < 4.2 mm; 165° < FOV < 175°; 2 mm < EPD < 2.2 mm; 1.9 ≤ Fno ≤ 1.95; 8.8 mm < IH < 9.1 mm; 13.5° < CRA < 15.5°. In the above conditional formula, 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, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, and CRA represents the principal ray incident angle at the maximum image height of the optical lens. By satisfying the above conditional formula, the optical lens has at least one or more advantages such as short focal length, ultra-large field angle, large entrance pupil diameter, large aperture, large image plane, small CRA, low distortion, low sensitivity, and high pixel characteristics.

[0071] In some embodiments, the seven lenses in the optical lens can all be made of plastic lenses or adopt a structure with a combination of glass and plastic materials. Preferably, the optical lens of the present invention adopts a lens structure with a combination of seven glass and plastic materials, which can improve the thermal stability performance. Specifically, the first lens and the third lens can be made of glass lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, and reduce the volume, providing an optical lens product with higher cost performance.

[0072] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh 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 third lenses in the optical lens provided by this invention can be spherical lenses; the second, fourth, fifth, sixth, and seventh lenses can all be aspherical lenses.

[0073] 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:

[0074]

[0075] 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, and H are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.

[0076] 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.

[0077] Example 1

[0078] 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 S17, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0079] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0080] The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex.

[0081] The third lens L3 has positive optical power, its object side S5 is concave, and its image side S6 is convex.

[0082] The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side S8 is convex.

[0083] The fifth lens L5 has positive optical power, its object side S9 is concave, and its image side S10 is convex near the optical axis.

[0084] The sixth lens L6 has negative optical power, its object side S11 is concave near the optical axis, and its image side S12 is concave.

[0085] The seventh lens L7 has positive optical power, its object side surface S13 is convex, and its image side surface S14 is convex.

[0086] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0087] The imaging plane S17 is a plane.

[0088] The first lens L1 and the third lens L3 are glass spherical lenses; the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspherical lenses.

[0089] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0090] Table 1-1

[0091]

[0092] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0093] Table 1-2

[0094] Face number K B C D E F G H S3 1.81E+01 -2.80E-03 -2.28E-05 -3.04E-08 -2.02E-08 -1.58E-09 5.08E-12 1.96E-11 S4 1.12E+01 -8.92E-04 7.37E-05 -1.45E-08 -1.25E-09 -7.81E-11 1.09E-12 1.07E-12 S7 3.74E+01 7.54E-04 8.46E-05 2.31E-05 -1.49E-06 3.81E-12 7.90E-11 1.54E-11 S8 5.18E+00 1.17E-03 3.52E-04 6.71E-06 1.64E-07 -8.68E-11 -3.76E-12 8.17E-12 S9 2.09E+01 -4.48E-04 -2.30E-05 -1.76E-06 -1.89E-06 1.45E-09 -6.07E-11 -5.06E-11 S10 -1.66E+02 7.79E-03 -7.12E-05 -2.12E-05 8.28E-08 -5.42E-10 -4.73E-11 -3.88E-12 S11 1.83E+01 6.76E-03 -3.99E-05 -1.28E-05 -1.16E-08 3.99E-10 4.59E-11 4.67E-12 S12 -8.09E+00 1.04E-03 -1.03E-04 -2.93E-06 5.09E-08 2.11E-10 1.04E-11 3.83E-13 S13 -9.28E+00 7.33E-04 8.74E-06 -5.55E-06 1.39E-07 -6.58E-11 -2.02E-12 4.84E-14 S14 -3.34E+00 -2.38E-03 6.75E-05 -3.05E-06 1.55E-07 -4.99E-12 -1.04E-13 -8.66E-15

[0095] In this embodiment, the field curvature curve, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown.

[0096] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of 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 can effectively correct the field curvature.

[0097] Figure 3The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within -0.01 mm to 0.04 mm, indicating that the optical lens can correct axial aberration well.

[0098] Figure 4 The diagram shows the transverse chromatic aberration curves for Example 1, representing 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 diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2 μm to 4 μm, indicating that the optical lens can effectively correct chromatic aberration.

[0099] Figure 5 The relative illumination curve of Example 1 is shown, which represents the relative illumination value at different field-of-view angles on the imaging plane. The horizontal axis represents the half field of view (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is greater than 50%, indicating that the optical lens has good relative illumination.

[0100] Example 2

[0101] Please see Figure 6 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 S4 of the second lens L2 is concave and the object side S5 of the third lens L3 is convex. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0103] Table 2-1

[0104]

[0105]

[0106] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0107] Table 2-2

[0108] Face number K B C D E F G H S3 -4.13E-01 -1.27E-03 -1.23E-05 1.54E-09 -3.60E-08 -2.64E-09 -7.12E-13 2.62E-11 S4 -5.85E+00 8.56E-04 3.46E-05 -5.12E-08 -4.15E-09 -3.19E-10 -8.58E-12 2.24E-12 S7 -4.36E+00 9.96E-04 4.40E-05 -4.02E-07 -3.37E-07 -3.57E-10 -4.91E-10 -9.90E-11 S8 3.04E+00 -6.04E-04 1.38E-04 -1.38E-06 -4.06E-07 1.31E-09 -3.12E-11 -5.07E-11 S9 8.81E+00 -1.35E-03 -4.60E-05 -1.67E-06 -5.88E-07 -5.20E-09 4.39E-10 1.80E-10 S10 -2.69E+01 2.57E-03 2.93E-06 -4.98E-08 -1.64E-08 -3.84E-10 -1.02E-10 -1.16E-11 S11 2.78E+00 9.98E-04 1.02E-04 -2.04E-09 -5.61E-08 -7.16E-10 -3.04E-11 -2.53E-12 S12 -4.99E+00 -1.22E-03 -3.13E-05 3.11E-08 -1.44E-08 2.02E-11 -9.54E-13 1.89E-13 S13 -3.88E+00 -1.35E-03 2.44E-05 2.72E-08 -1.95E-08 1.07E-10 4.10E-12 -1.17E-13 S14 -4.95E+00 -2.37E-03 8.34E-05 -3.63E-07 1.48E-08 -1.44E-11 -7.12E-13 -2.21E-14

[0109] In this embodiment, the field curvature curve, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown.

[0110] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0111] from Figure 8 As can be seen, the axial aberration offset is controlled within -0.03mm to 0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0112] from Figure 9 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 can correct chromatic aberration well.

[0113] from Figure 10 As can be seen, the relative illumination value of the optical lens is greater than 50%, indicating that the optical lens has good relative illumination.

[0114] Example 3

[0115] Please see Figure 11 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 S5 of the third lens L3 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0116] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0117] Table 3-1

[0118]

[0119]

[0120] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0121] Table 3-2

[0122] Face number K B C D E F G H S3 1.62E+00 -4.34E-04 4.01E-05 1.34E-08 5.17E-10 1.61E-10 -7.46E-12 -2.85E-12 S4 -5.36E-01 -8.82E-05 1.21E-05 -2.41E-14 -2.71E-15 -2.04E-16 -1.35E-17 -7.73E-19 S7 2.00E+02 5.97E-05 3.61E-06 2.96E-14 1.77E-15 -1.21E-14 -3.34E-17 -4.62E-19 S8 -1.50E+00 8.36E-05 2.40E-06 -2.55E-09 -2.74E-10 -4.01E-11 1.39E-12 -1.79E-12 S9 -6.39E+01 -5.11E-05 -5.69E-06 -4.92E-13 -2.67E-15 -2.04E-16 -1.79E-17 -1.26E-18 S10 -1.36E+00 -1.81E-04 -8.98E-06 1.30E-09 1.03E-10 7.93E-12 5.25E-13 2.74E-14 S11 7.35E-01 -4.96E-05 -3.75E-06 -2.64E-14 -2.41E-15 -1.99E-16 -1.47E-17 -1.07E-18 S12 2.04E-01 -2.01E-05 -4.10E-06 3.72E-10 1.82E-11 6.74E-13 9.09E-15 -1.52E-15 S13 -1.59E+00 -7.06E-05 -3.28E-06 -8.77E-15 -5.01E-16 -2.57E-17 -9.41E-19 -7.43E-20 S14 1.28E+00 -2.53E-04 3.69E-06 -2.73E-10 1.05E-11 -3.35E-13 -1.11E-14 -3.82E-16

[0123] In this embodiment, the field curvature curve, axial aberration curve, transverse chromatic aberration curve, and relative illumination curve of the optical lens 300 are respectively as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown.

[0124] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.1mm to 0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0125] from Figure 13 As can be seen, the axial aberration offset is controlled within -0.01mm to 0.05mm, indicating that the optical lens can effectively correct axial aberration.

[0126] from Figure 14 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 can correct chromatic aberration well.

[0127] from Figure 15 As can be seen, the relative illumination value of the optical lens is greater than 58%, indicating that the optical lens has good relative illumination.

[0128] 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.

[0129] Table 4

[0130] Parameters and conditional expressions Example 1 Example 2 Example 3 f(mm) 3.95 4.02 4.10 EPD (mm) 2.08 2.08 2.10 TTL(mm) 26.000 26.000 26.002 Fno 1.90 1.93 1.95 CRA(°) 13.65 13.75 15.25 IH(mm) 9.03 8.98 8.93 FOV (°) 170.00 166.00 168.00 IH / f 2.29 2.24 2.18 FOV / Fno(°) 89.47 86.01 86.15 TTL / Fno(mm) 13.68 13.47 13.33 f1 / f -1.27 -1.31 -1.24 R1 / SAG11 214.98 298.73 386.96 f3 / f 2.31 1.51 2.51 f4 / f 2.61 2.22 3.58 f6 / f -1.01 -0.88 -1.68 f7 / f 1.19 1.19 2.40 f4567 / f 2.44 2.21 2.41 CSD11 / CSD71 1.39 1.34 1.37 f2 / f -31.04 -2.08 -12.68 R3 / f -4.46 -1.82 -1.66 CSD32 / CSD41 1.57 1.30 1.37 SAG11 / CT1 0.27 0.23 0.20 R12 / SAG62 3.30 2.89 20.09 CSD72 / SAG72 -2.46 -2.98 -4.08 (CT12+CT2) / (CT34+CT3) 1.09 0.87 1.35

[0131] In summary, the optical lens provided by the present invention employs seven 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, giving the lens one or more advantages such as ultra-wide angle, high pixel count, large aperture, high illumination, and high imaging quality.

[0132] 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.

[0133] 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 seven lenses having optical power, characterized in that, It successively includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is concave; A third lens with positive optical power, whose image side is convex; A fourth lens with positive optical power, whose object side is convex and whose image side is convex; A fifth lens with positive optical power, whose object side is concave and whose image side is convex near the optical axis; A sixth lens with negative optical power, whose object side is concave near the optical axis and whose image side is concave; A seventh lens with positive optical power, whose object side is convex and whose image side is convex; Wherein, 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: 2.1 < IH / f < 2.3; the maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 85° < FOV / Fno < 90°.

2. The optical lens according to claim 1, characterized in that, The overall optical length TTL of the optical lens and the f-number Fno of the optical lens satisfy: 13mm < TTL / Fno < 14mm.

3. 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: -1.4 < f1 / f < -1.2; the curvature radius R1 of the object side of the first lens and the sagittal height SAG11 of the clear aperture radius of the object side of the first lens satisfy: 210 < R1 / SAG11 < 390.

4. The optical lens according to claim 1, characterized in that, The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < f3 / f < 2.

6.

5. 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: 2.2 < f4 / f < 3.

6.

6. The optical lens according to claim 1, characterized in that, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.7 < f6 / f < -0.

8.

7. The optical lens according to claim 1, characterized in that, The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.1 < f7 / f < 2.

5.

8. The optical lens according to claim 1, characterized in that, The combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.2 < f4567 / f < 2.

5.

9. The optical lens according to claim 1, characterized in that, The clear aperture radius CSD11 of the object side of the first lens and the clear aperture radius CSD71 of the object side of the seventh lens satisfy: 1.3 < CSD11 / CSD71 < 1.

4.

10. The optical lens according to claim 1, characterized in that, The clear aperture radius CSD72 of the image side of the seventh lens and the sagittal height SAG72 of the clear aperture radius of the image side of the seventh lens satisfy: -4.1 < CSD72 / SAG72 < -2.4.

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