Optical lens

Abstract

The application provides an optical lens, which has seven lenses with optical power, and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, whose image side is concave; a second lens with positive optical power, whose image side is convex; a third lens with positive optical power, whose object side is convex, and whose image side is convex; a fourth lens with negative optical power, whose object side is concave, and whose image side is concave; a fifth lens with positive optical power, whose object side is convex, and whose image side is convex; a sixth lens with negative optical power, whose object side is concave, and whose image side is convex; and a seventh lens with negative optical power, whose image side is concave. The optical lens provided by the application has one or more advantages of super wide angle, large aperture, large image surface, miniaturization, high imaging quality and the like, by virtue of 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 gradual improvement of intelligent driving, in-vehicle cameras, as the "eyes of autonomous driving," are core sensor devices. The development of in-vehicle cameras has gradually expanded from early applications such as driving recording, reversing images, and parking surround view to behavior recognition and ADAS assisted driving in intelligent cockpits.

[0003] As an extension of the Driver Monitoring System (DMS), the In-Cabin Personnel Monitoring System (OMS) can not only monitor the driver's condition and alert them to dangerous behaviors such as driver fatigue, smoking, and phone use, but also monitor the behavior of other passengers, including whether children are left in the vehicle or any items left behind. However, existing OMS lenses suffer from a narrow field of view, insufficient light transmission, and low image quality, making them inadequate for monitoring the condition of both the driver and passengers. 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] The technical solution adopted in this invention is as follows: An optical lens has seven lenses with optical power, arranged sequentially along the optical axis from the object side to the imaging plane: The first lens with negative optical power has a concave image-side surface. A second lens with positive optical power has a convex image-side surface. A third lens with positive optical power has a convex object-side surface and a convex image-side surface. The fourth lens with negative optical power has a concave object side and a concave image side. The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface. The sixth lens with negative optical power has a concave object side and a convex image side. The seventh lens has negative optical power and its image-side surface is concave. Wherein, 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<2.7。

[0006] Further preferably, the total optical length (TTL) of the optical lens and the aperture value (Fno) of the optical lens satisfy: 7mm <TTL / Fno<11mm。

[0007] Further preferably, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 68° < FOV / Fno < 78°.

[0008] 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 < -0.9; the image-side curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.7 < R2 / f < 1.

[0009] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 2.1 < f2 / f < 5.9; the image-side curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -1.7 < R4 / f < -1.4.

[0010] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.65 < f3 / f < 1.8; the object-side curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 2.1 < R5 / f < 3.4.

[0011] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -2.8 < f4 / f < -1.8; the image-side curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R8 / f < 1.9.

[0012] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.2 < f5 / f < 1.9; the effective focal length f of the optical lens and the object-side curvature radius R9 of the fifth lens satisfy: 4.4 < R9 / f < 5.6.

[0013] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -4.9 < f6 / f < -3.2; the effective focal length f of the optical lens and the image-side curvature radius R12 of the sixth lens satisfy: -2.3 < R12 / f < -1.2.

[0014] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -16 < f7 / f < -6.4; the effective focal length f of the optical lens and the image-side curvature radius R14 of the seventh lens satisfy: 5.6 < R14 / f < 9.7.

[0015] 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, large aperture, large image plane, miniaturization, and high imaging quality. Attached Figure Description

[0016] 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: Figure 1 This is a schematic diagram of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 3 This is an F-Theta distortion curve of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 4 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0020] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0021] Figure 6 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 7 This is the F-Theta distortion curve of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 8 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0024] Figure 9 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0025] Figure 10 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 11 This is the F-Theta distortion curve of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 12 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0028] Figure 13 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0029] Figure 14 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0030] Figure 15 This is the F-Theta distortion curve of the optical lens in Embodiment 4 of the present invention.

[0031] Figure 16 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0032] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0033] Figure 18 This is a field curvature curve diagram of the optical lens in Embodiment 5 of the present invention.

[0034] Figure 19 This is the F-Theta distortion curve of the optical lens in Embodiment 5 of the present invention.

[0035] Figure 20 This is an axial aberration curve of the optical lens in Embodiment 5 of the present invention.

[0036] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The optical lens provided in this embodiment of the invention has seven lenses with optical power, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0045] In some embodiments, the first lens may have negative optical power, its object-side surface may be concave or convex, and its image-side surface may be concave. The second lens may have positive optical power, its object-side surface may be concave or convex, and its image-side surface may be convex. The third lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be convex. The fourth lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be concave. The fifth lens may have positive optical power, its object-side surface may be convex, and its image-side surface may be convex. The sixth lens may have negative optical power, its object-side surface may be concave, and its image-side surface may be convex. The seventh lens may have negative optical power, its object-side surface may be concave or convex, and its image-side surface may be concave.

[0046] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the second lens and the third lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the imaging. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the imaging. When the aperture is located between the second lens and the third lens, it is convenient for the correction of aperture aberration.

[0047] In some embodiments, the optical lens may further include a filter, and the filter may be 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.

[0048] In some embodiments, the fifth lens and the sixth lens may be glued together to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0049] 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 < 2.7. 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 space, increasing the width of the light beam incident on the optical lens, improving the brightness at the image plane of the optical lens and avoiding the generation of vignetting; at the same time, enabling the optical lens to have large-image-plane characteristics, matching a large-image-plane chip to improve the resolution, and ensuring the imaging quality of the optical lens.

[0050] In some embodiments, the overall optical length TTL of the optical lens and the f-number Fno of the optical lens satisfy: 7mm < TTL / Fno < 11mm. By satisfying the above conditional formula, by controlling the relationship between the overall length and the f-number 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.

[0051] In some embodiments, the maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 68° < FOV / Fno < 78°. 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.

[0052] 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 < -0.9. By satisfying the above conditional formula and setting the first lens of the optical lens as a lens with a negative optical power, the light rays entering the optical lens at a large angle can be captured, the field angle range of the optical lens can be expanded, and at the same time, it is also beneficial to reduce the sensitivity of the optical lens and achieve the miniaturized design of the optical lens.

[0053] In some embodiments, the image-side curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: 0.7 < R2 / f < 1. By satisfying the above conditional formula, the curvature radius of the image side of the first lens can be controlled, providing a negative refractive power for the optical lens, thereby capturing the light rays entering the optical lens at a large angle and expanding the field angle range 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: 2.1 < f2 / f < 5.9. By satisfying the above conditional formula, the second lens has the function of converging light rays. When paired with the negative optical power of the first lens, the light rays passing through the first lens can be further converged, reducing the height of peripheral light rays, which is beneficial to reducing the aperture of the rear lens and at the same time is beneficial to balancing aberrations and improving resolution.

[0055] In some embodiments, the image-side curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -1.7 < R4 / f < -1.4. By satisfying the above conditional formula, the image side of the second lens is designed as a convex surface, which can reasonably limit the width of the light beam emitted from the second lens, reduce the sensitivity of the optical lens, and improve the assembly stability at the same time.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.65 < f3 / f < 1.8. By satisfying the above conditional formula, by setting a 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 ray trend from the first lens and the second lens, and at the same time is beneficial to correcting marginal aberrations and improving imaging resolution.

[0057] In some embodiments, the object-side curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 2.1 < R5 / f < 3.4. By satisfying the above conditional formula, the object side of the third lens is concave, offsetting the spherical aberration brought by the first two lenses and at the same time reducing the incident angle of off-axis light rays, significantly improving astigmatism and coma, and greatly enhancing the clarity of the image edge.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -2.8 < f4 / f < -1.8. Satisfying the above conditional formula, as the intermediate lens of the imaging lens group, the negative refractive power provided by the fourth lens for the optical lens can better constrain the light beam, so that it can be used to correct the chromatic aberration of the optical lens. At the same time, it can perform intermediate correction on the aberration generated by the decentration difference of each lens on the object side and reduce the correction pressure of the subsequent lens group.

[0059] In some embodiments, the image-side curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R8 / f < 1.9. Satisfying the above conditional formula, by reasonably controlling the surface shape of the image side of the fourth lens, it helps to collect the light rays emitted by the front-end lens and make the collected light rays smoothly enter the subsequent lenses, and is beneficial to improving the resolution of the optical lens.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.2 < f5 / f < 1.9. Satisfying the above conditional formula, restricting the focal length value of the fifth lens 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, enhancing the resolution, and at the same time 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 effective focal length f of the optical lens and the object-side curvature radius R9 of the fifth lens satisfy: 4.4 < R9 / f < 5.6. Satisfying the above conditional formula, restricting the surface shape of the object side of the fifth lens helps to smooth the light trend of the front-end lens, correct the aberration generated by the front-end lens, and improve the imaging quality.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -4.9 < f6 / f < -3.2. Satisfying the above conditional formula, reasonably controlling the focal length value of the sixth lens makes the large-field light rays slowly rise, 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, beneficial to achieving a large target surface and reducing the main ray incident angle.

[0063] In some embodiments, the effective focal length f of the optical lens and the image-side curvature radius R12 of the sixth lens satisfy: -2.3 < R12 / f < -1.2. Satisfying the above conditional formula, by controlling the ratio of the effective focal length of the optical lens and the curvature radius of the image side of the sixth lens within a certain range, the astigmatism of the sixth lens can be within a reasonable range, and the astigmatism generated by the front lens can be effectively balanced, so that the optical lens has good imaging quality.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -16 < f7 / f < -6.4. Meeting the above conditional formula is conducive to expanding the width of the light beam, such that the light beam at a larger angle expands in width after passing through the first lens to the seventh lens, enabling the wide light beam to fully enter the imaging surface of the optical lens, resulting in the optical lens having a wider field of view range and being conducive to achieving high-pixel imaging.

[0065] In some embodiments, the effective focal length f of the optical lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 5.6 < R14 / f < 9.7. Meeting the above conditional formula can keep the optical power of the seventh lens within a reasonable range, effectively reducing the deflection angle of the marginal field light entering the photosensitive chip, increasing the matching degree between the optical lens and the photosensitive chip, while improving the astigmatism of the off-axis field and enhancing the overall image quality.

[0066] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.5 < TTL / f < 6.7. Meeting the above conditional formula can rationally configure the ratio of the overall optical length to the effective focal length of the optical lens, facilitating the miniaturized design of the optical lens. At the same time, it is also conducive to the optical lens having a reasonable field angle range while achieving certain focal length characteristics, thereby meeting the wide-angle design of the optical lens and enabling the optical lens to obtain sufficient object-side space information.

[0067] 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: 1.1 < CSD11 / CSD71 < 1.7. Meeting the above conditional formula enables the optical lens to have a larger aperture, better achieving the collection of large-angle light, realizing the ultra-wide-angle imaging of the optical lens, and at the same time being able to increase the imaging area of the optical lens, realizing the large target surface imaging of the optical lens.

[0068] 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: 0.8 < CSD32 / CSD41 < 1. Meeting the above conditional formula, by reasonably distributing the maximum effective apertures of the third lens and the fourth lens, is conducive to reducing the step difference between the third lens and the fourth lens, enabling the light to enter the fourth lens more smoothly from the third lens.

[0069] In some embodiments, the clear aperture semi-diameter CSD71 of the object side surface of the seventh lens and the sagittal height SAG71 of the clear aperture semi-diameter of the object side surface of the seventh lens satisfy: 9 < CSD71 / SAG71 < 28. Meeting the above conditional formula is conducive to controlling the surface shape of the marginal field of the seventh lens, improving the correction ability of various aberrations of the marginal field light, and thus enhancing the imaging quality of the marginal field of the optical lens.

[0070] In some embodiments, the clear aperture semi-diameter CSD11 of the object side surface of the first lens and the spacing CT12 between the first lens and the second lens on the optical axis satisfy: 1.3 < CSD11 / CT12 < 2.6. By satisfying the above conditional formula, by controlling the clear aperture of the object side surface of the first lens and reducing the air gap between the first lens and the second lens, it is beneficial to reduce the total length of the optical lens, make the arrangement of the optical lens more compact, and reduce the risk of ghost image generation; furthermore, it is also beneficial to reduce the difficulty of the structural arrangement of the optical lens and improve the assembly forming yield of the optical lens.

[0071] In some embodiments, the optical lens satisfies the following conditional formula: 2.5mm < f < 3.7mm; 15mm < TTL < 23mm; 135° < FOV < 160°; 1.1mm < EPD < 1.8mm; 2 < Fno < 2.1; 15° < CRA < 32°; 6.5mm < IH < 9.5mm. In the above conditional formula, f represents the effective focal length of the optical lens, TTL represents the total optical 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, CRA represents the main ray incident angle at the maximum image height of the optical lens, and IH represents the true 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 of short focal length, miniaturization, ultra-large field angle, large entrance pupil diameter, large aperture, large image plane, low distortion, low sensitivity, and high pixel characteristics.

[0072] 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 third lens in the optical lens provided by the present invention adopt glass lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens adopt plastic lenses. The optical lens of the present invention adopts a hybrid glass-plastic structure to improve the thermal stability.

[0073] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the first lens and the third lens of the present invention adopt spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can all adopt aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0074] 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: ; 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.

[0075] 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. Example 1

[0076] Please see Figure 1 The diagram shown is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens includes, in sequence along the optical axis from the object side to the imaging plane: a first lens L1, a second lens L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0077] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has positive optical power, its object side S3 is concave, and its image side S4 is convex. The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is convex. The fourth lens L4 has negative optical power, its object side S7 is concave, and its image side S8 is concave. The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side is convex. The sixth lens L6 has negative optical power, its object side is concave, and its image side S11 is convex. The fifth lens L5 and the sixth lens L6 form a cemented lens group with optical power, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10. The seventh lens L7 has negative optical power, its object side S12 is concave near the optical axis, and its image side S13 is concave near the optical axis. The object-side surface S14 and the image-side surface S15 of filter G1 are both planar. The imaging plane S16 is a plane.

[0078] The first lens L1 and the third lens L3 are glass spherical lenses, while 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.

[0079] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0080] Table 1-1 The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0081] Table 1-2 Figure 2 The field curvature curve of the optical lens 100 in this embodiment 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 ±0.04 mm, indicating that the optical lens 100 can correct the field curvature well.

[0082] Figure 3 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 -5% to 0, indicating that the optical lens 100 can correct distortion well.

[0083] Figure 4 The diagram shows the axial aberration curve of the optical lens 100 in this embodiment, 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 100 can correct axial aberration well. Example 2

[0084] 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 S1 of the first lens L1 is concave, the object side surface S3 of the second lens L2 is convex, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0085] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0086] Table 2-1 The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0087] Table 2-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and axial aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0088] from Figure 6 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.07mm to 0, indicating that the optical lens 200 can correct the field curvature well.

[0089] from Figure 7 As can be seen, the distortion value is controlled within -12% to 0, indicating that the optical lens 200 can correct distortion well.

[0090] from Figure 8 As can be seen, the axial aberration offset is controlled within -0.03mm to 0.04mm, indicating that the optical lens 200 can effectively correct axial aberration. Example 3

[0091] 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 S3 of the second lens L2 is a convex surface; the object-side surface S12 of the seventh lens L7 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0092] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0093] Table 3-1 The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0094] Table 3-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and axial aberration curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0095] from Figure 10 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.18mm to 0.01mm, indicating that the optical lens 300 can correct the field curvature well.

[0096] from Figure 11 As can be seen, the distortion value is controlled within -4% to 0, indicating that the optical lens 300 can correct distortion well.

[0097] from Figure 12 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.03mm, indicating that the optical lens 300 can correct axial aberration well. Example 4

[0098] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S3 of the second lens L2 is a convex surface; 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 400 in Example 4 are shown in Table 4-1.

[0100] Table 4-1 The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0101] Table 4-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and axial aberration curve of the optical lens 400 are respectively as follows: Figure 14 , Figure 15 , Figure 16 As shown.

[0102] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.12mm to 0, indicating that the optical lens 400 can correct the field curvature well.

[0103] from Figure 15 As can be seen, the distortion value is controlled within -10% to 0, indicating that the optical lens 400 can correct distortion well.

[0104] from Figure 16 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.03mm, indicating that the optical lens 400 can correct axial aberration well. Example 5

[0105] Please see Figure 17 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object-side surface S3 of the second lens L2 is a convex surface; the object-side surface S12 of the seventh lens L7 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0106] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0107] Table 5-1 The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0108] Table 5-2 In this embodiment, the field curvature curve, F-Theta distortion curve, and axial aberration curve of the optical lens 500 are respectively as follows: Figure 18 , Figure 19 , Figure 20 As shown.

[0109] from Figure 18 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.12mm to 0, indicating that the optical lens 500 can correct the field curvature well.

[0110] from Figure 19 As can be seen, the distortion value is controlled within -4% to 0, indicating that the optical lens 500 can correct distortion well.

[0111] from Figure 20 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.03mm, indicating that the optical lens 500 can correct axial aberration well.

[0112] Please refer to Table 6 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.

[0113] Table 6 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, large aperture, miniaturization, and high pixel count.

[0114] 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.

[0115] 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 a negative optical power, whose image side is concave; A second lens with a positive optical power, whose image side is convex; A third lens with a positive optical power, whose object side is convex and whose image side is convex; A fourth lens with a negative optical power, whose object side is concave and whose image side is concave; A fifth lens with a positive optical power, whose object side is convex and whose image side is convex; A sixth lens with a negative optical power, whose object side is concave and whose image side is convex; A seventh lens with a negative optical power, whose image side is concave; 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: 2.2 < IH / f < 2.

7.

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: 7mm < TTL / Fno < 11mm.

3. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 68° < FOV / Fno < 78°.

4. 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 < -0.9; the curvature radius R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy: 0.7 < R2 / f < 1.

5. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 2.1 < f2 / f < 5.9; the curvature radius R4 of the image side of the second lens and the effective focal length f of the optical lens satisfy: -1.7 < R4 / f < -1.

4.

6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.65 < f3 / f < 1.8; the curvature radius R5 of the object side of the third lens and the effective focal length f of the optical lens satisfy: 2.1 < R5 / f < 3.

4.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -2.8 < f4 / f < -1.8; the curvature radius R8 of the image side of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < R8 / f < 1.

9.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.2 < f5 / f < 1.9; the effective focal length f of the optical lens and the curvature radius R9 of the object side of the fifth lens satisfy: 4.4 < R9 / f < 5.

6.

9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -4.9 < f6 / f < -3.2; the effective focal length f of the optical lens and the curvature radius R12 of the image side of the sixth lens satisfy: -2.3 < R12 / f < -1.

2.

10. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -16 < f7 / f < -6.4; the effective focal length f of the optical lens and the curvature radius R14 of the image side of the seventh lens satisfy: 5.6 < R14 / f < 9.7.

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