Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses, and sequentially comprises a first lens with negative focal power, a second lens with negative 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, the object side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, 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 concave surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens is improved, so that the lens has one or more advantages of large field angle, large aperture, large image height, high pixel, small distortion, high imaging quality and the like.

Description

Technical Field

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

[0002] With the prevalence of remote work and online education, video conferencing has become an integral part of daily life and work. The quality of video conferencing depends heavily on the optical lens used, placing higher demands on these lenses. For example, to provide clear video quality, video conferencing lenses typically require high resolutions, such as 1080p or 4K. Furthermore, to effectively capture conference room participants, a wider field of view is often required. Traditional video conferencing lenses have limitations, such as low resolution, a narrow field of view, and poor imaging in low-light or dim environments. Therefore, there is an urgent need for an optical lens that can meet the demands of video conferencing. Summary of the Invention

[0003] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0004] The present invention provides an optical lens, comprising seven lenses, which include the following lenses in order from the object side to the imaging surface along the optical axis:

[0005] The first lens has a negative optical power, its object-side surface is convex and its image-side surface is concave;

[0006] a second lens having negative optical power and a concave object-side surface;

[0007] a third lens element having positive optical power, whose object-side surface is convex and whose image-side surface is convex;

[0008] a fourth lens element having positive optical power and a convex object-side surface;

[0009] a fifth lens element having positive refractive power and a convex image-side surface;

[0010] a sixth lens element having negative optical power, whose object-side surface and image-side surface are concave;

[0011] a seventh lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave;

[0012] The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy the following conditions: 1.3 <TTL / IH<1.6。

[0013] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 50°<(f×FOV) / IH<60°.

[0014] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.7 <f1 / f<-1.6。

[0015] Further preferably, a curvature radius R13 of the object side surface of the seventh lens and a curvature radius R14 of the image side surface of the seventh lens satisfy: -22<(R13+R14) / (R13-R14)<76.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: <f7 / f<35。

[0017] Further preferably, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 4 <R1 / R2<5。

[0018] Further preferably, the distance CT56 between the fifth lens and the sixth lens on the optical axis and the center thickness CT5 of the fifth lens satisfy: 0.08 <CT56 / CT5<0.1。

[0019] Further preferably, the object-side light clearance half-aperture sag height SAG71 of the seventh lens element, the image-side light clearance half-aperture sag height SAG72 of the seventh lens element, and the center thickness CT7 of the seventh lens element satisfy the following relationship: -0.5<(SAG72-SAG71) / CT7<-0.15.

[0020] Further preferably, the object-side light semi-aperture DM11 of the first lens and the image-side light semi-aperture DM72 of the seventh lens satisfy the following relationship: 1.2 <DM11 / DM72<1.4。

[0021] Further preferably, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens meet the following conditions: 6.5 <IH / EPD<8.5。

[0022] Compared with the existing technology, the optical lens provided by the present invention uses seven lenses with specific optical powers. Through the combination of specific surface shapes and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as a large field of view angle, a large aperture, a large image height, a high pixel, small distortion, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0025] Figure 2 Graph showing the field curvature of the optical lens in Example 1 of the present invention.

[0026] Figure 3 Graph showing the F-Theta distortion of the optical lens in Example 1 of the present invention.

[0027] Figure 4 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0028] Figure 5 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0029] Figure 6 This is the MTF curve of the optical lens in Example 1 of the present invention.

[0030] Figure 7 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0031] Figure 8 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0032] Figure 9 Graph showing the F-Theta distortion of the optical lens in Example 2 of the present invention.

[0033] Figure 10 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0034] Figure 11 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0035] Figure 12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0036] Figure 13 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0037] Figure 14 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0038] Figure 15 Graph showing the F-Theta distortion of the optical lens in Example 3 of the present invention.

[0039] Figure 164 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0040] Figure 17 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0041] Figure 18 This is the MTF curve of the optical lens in Example 3 of the present invention.

[0042] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0043] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of embodiments of the present application and are not intended to limit the scope of the present 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.

[0044] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0045] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0046] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0047] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0048] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] The optical lens provided in an embodiment of the present invention comprises seven lenses in total. The optical lens comprises, in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0051] In some embodiments, the first lens may have negative optical power, its object-side surface is convex, and its image-side surface is concave. The second lens may have negative optical power, its object-side surface is concave, and its image-side surface may be either concave or convex. The third lens may have positive optical power, its object-side surface is convex, and its image-side surface is convex. The fourth lens may have positive optical power, its object-side surface is convex, and its image-side surface may be either concave or convex. The fifth lens may have positive optical power, its object-side surface may be either concave or convex, and its image-side surface is convex. The sixth lens may have negative optical power, its object-side surface is concave, and its image-side surface is concave. The seventh lens may have positive optical power, its object-side surface is convex, and its image-side surface is concave.

[0052] In some embodiments, the optical lens may further include an aperture, which may be located between the fourth and fifth lenses. It will be appreciated that the aperture is used to limit the amount of light entering, thereby varying the brightness of the image. When the aperture is located between the fourth and fifth lenses, it facilitates correction of aperture aberrations.

[0053] 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.

[0054] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 1.3 < TTL / IH < 1.6. Meeting the above conditions can balance the relationship between the image height and the total length. While achieving high-pixel imaging, it can also achieve a short total length, enabling direct vertical imaging without the need to deflect light rays using a prism for imaging.

[0055] In some embodiments, the effective focal length f of the optical lens, the maximum field angle of view FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 50° < (f × FOV) / IH < 60°. Meeting the above conditional formula, by reasonably restricting the relationship between the focal length, field angle of view, and image height of the optical lens, it is conducive to achieving the balance of a large field angle of view and large target surface imaging of the optical lens, better meeting the usage requirements of video conferencing cameras.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.7 < f1 / f < -1.6. Meeting the above conditions, the first lens has an appropriate negative focal length, which is conducive to expanding the field angle of view of the optical lens.

[0057] In some embodiments, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.2 < f / EPD < 2.8. Meeting the above conditions, by controlling the ratio of the total effective focal length to the entrance pupil diameter, the lens has the advantage of a large aperture, thereby increasing the light flux of the lens and enhancing the imaging effect of the lens in a dark environment.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 11 < f7 / f < 35. Meeting the above conditions, the seventh lens meets the above conditions, which helps to reasonably collect light, ensure the light passing amount, improve the relative illumination, and enhance the brightness of the optical lens at the image plane.

[0059] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 4 < R1 / R2 < 5. Meeting the above conditions, the surface shape of the first lens can be reasonably set, enhancing the light collection ability of the first lens, thereby achieving an ultra-large field angle of view.

[0060] In some embodiments, the distance CT56 between the fifth lens and the sixth lens on the optical axis and the central thickness CT5 of the fifth lens satisfy: 0.08 < CT56 / CT5 < 0.1. Meeting the above range is conducive to the structural design and production process of the optical lens while ensuring the imaging quality of the lens.

[0061] In some embodiments, the sagittal height SAG71 of the object-side clear aperture radius, the sagittal height SAG72 of the image-side clear aperture radius of the seventh lens, and the central thickness CT7 of the seventh lens satisfy: -0.5 < (SAG72 - SAG71) / CT7 < -0.15. Meeting the above conditions, by controlling the relationship between the height difference of the sagittal heights of the image side and the object side of the seventh lens and the central thickness of the seventh lens, it is conducive to correcting the coma of the off-axis field and improving the imaging quality of the off-axis field of the optical lens.

[0062] In some embodiments, the clear aperture radius DM11 of the object side of the first lens and the clear aperture radius DM72 of the image side of the seventh lens satisfy: 1.2 < DM11 / DM72 < 1.4. Meeting the above conditions can effectively reduce the aperture size of the lens while ensuring that light enters the system within a large range, which is conducive to achieving the balance of the field of view and aperture of the lens.

[0063] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 6.5 < IH / EPD < 8.5. Meeting the above range enables the optical lens to satisfy a large image plane while also ensuring sufficient image plane brightness in the edge field of view, preventing the occurrence of vignetting, and thus improving the imaging quality.

[0064] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4 < TTL / f < 4.6. Meeting the above conditions can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens.

[0065] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.7 < IH / f < 3.1. Meeting the above conditions can achieve a larger field of view angle and imaging range, and can achieve the characteristics of a large image plane while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system. <00001​​​In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.2 < f3 / f < 2.3. Meeting the above conditions, the third lens converges the incident light at the front end, which is beneficial to correcting the aberration and distortion of the edge field of view brought by the front lens group, making the lens have less distortion and capable of providing a high-definition imaging effect.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.4 < f4 / f < 2.3. Meeting the above conditions, by reasonably setting the focal length of the fourth lens, it is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, improving the imaging quality of the optical lens, and ensuring the stability of the optical system.

[0069] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.1 < f5 / f < 2. The fifth lens meeting the above conditions can further focus the light, adjust the angle of the chief ray, optimize the imaging quality, and correct the remaining aberrations (such as distortion, chromatic aberration, etc.), reducing the distortion of the wide-angle lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.5 < f6 / f < -1.1. Meeting the above conditions, the sixth lens has an appropriate negative focal length, which is beneficial to further increasing the imaging area of the optical lens, while balancing various aberrations generated by the front lens group and improving the imaging quality of the optical lens.

[0071] In some embodiments, the maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 60° < FOV / Fno < 70°. Meeting the above conditions is beneficial to increasing the light input of the lens, enabling the lens to achieve high-definition imaging even in a dim environment.

[0072] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < BFL / f < 0.75. Meeting the above range is beneficial to achieving a balance between obtaining good imaging quality and an optical back focal length that is easy to assemble, ensuring the imaging quality of the optical lens while avoiding interference between the lens and other components and reducing the assembly process difficulty of the camera module.

[0073] In some embodiments, the object-side curvature radius R11 of the sixth lens and the image-side curvature radius R12 of the sixth lens satisfy: -0.72 < R11 / R12 < -0.62. Meeting the above conditions, by reasonably setting the curvature radius of the sixth lens, the aberration of the optical lens can be corrected, reducing the tolerance sensitivity of the optical lens.

[0074] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.8 < R13 / R14 < 1.1. Satisfying the above range and reasonably defining the surface shape of the seventh lens helps light rays to be accurately focused on the imaging plane, improving the clarity of imaging and the uniformity of brightness.

[0075] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -3.2 < (R3 + R4) / (R3 - R4) < -0.9. Satisfying the above range can make the light ray trend smoother; at the same time, it can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0076] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -0.25 < (R11 + R12) / (R11 - R12) < -0.15. Satisfying the above range, reasonably controlling the radius of curvature of the object side surface and the image side surface of the sixth lens near the optical axis is beneficial to controlling the shape of the sixth lens, correcting the aberration generated by itself, and improving the imaging quality.

[0077] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: -22 < (R13 + R14) / (R13 - R14) < 76. Satisfying the above range, reasonably defining the shapes of the object side surface and the image side surface of the seventh lens can control the seventh lens to have an appropriate surface shape, which helps to control the light ray trend of the edge field of view and improve the imaging quality of the edge field of view.

[0078] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -0.15 < f1 / f7 < -0.04. Satisfying the above conditions, by reasonably setting the focal length relationship between the first and last lenses in the lens, while ensuring that as much light as possible enters the system, the area of light entering the imaging surface is increased, which is beneficial to achieving large image surface imaging of the lens, and at the same time increasing the light input and improving the relative illumination of the system.

[0079] In some embodiments, the central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 0.9 < CT4 / CT5 < 1.4. Satisfying the above conditions enables a reasonable configuration of the ratio of the thickness of the fourth lens on the optical axis to the thickness of the fifth lens on the optical axis. The fourth lens and the fifth lens can regulate each other to maintain the characteristics of miniaturization of the optical system.

[0080] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the total optical length TTL of the optical lens satisfy: 0.45 < ∑CT / TTL < 0.55. Satisfying the above conditions can effectively compress the total length of the optical lens.

[0081] In some embodiments, the distance CT23 between the second lens and the third lens on the optical axis and the distance ET23 between the edges of the second lens and the third lens satisfy: 0.2 < CT23 / ET23 < 1. By making the optical system satisfy the above relationship, while ensuring the lens assembly processability, the distance between the second lens and the third lens can be fully compressed, making the lens have the characteristics of miniaturization.

[0082] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 4 mm < IH / Fno < 4.7 mm. Satisfying the above conditions can achieve the balance between the aperture of the optical lens and the large image plane while maintaining a large image plane for the optical lens.

[0083] In some embodiments, the refractive index Nd3 of the third lens and the refractive index Nd2 of the second lens satisfy: 0.2 < Nd3 - Nd2 < 0.35. Satisfying the above conditions can reasonably match the refractive indices of the second lens and the third lens, making the optical lens satisfy the balance of wide field of view and small chromatic aberration, which is beneficial to correcting the chromatic aberration of the optical lens.

[0084] In some embodiments, the sagittal height SAG61 of the object-side clear aperture radius, the sagittal height SAG62 of the image-side clear aperture radius of the sixth lens, and the central thickness CT6 of the sixth lens satisfy: -1.5 < (SAG61 - SAG62) / CT6 < -1.3. Satisfying the above conditions, by controlling the relationship between the height difference of the sagittal heights of the image side and the object side of the sixth lens and the central thickness of the sixth lens, the shape of the sixth lens can be restricted, which is beneficial to the design and processing of the structure of the sixth lens, beneficial to correcting the aberrations of each field of view respectively, and beneficial to improving the imaging quality of the optical lens.

[0085] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field angle of the optical lens satisfy: 1.03 < (IH / 2) / (f×θ) < 1.06. Satisfying the above range can make the lens have a small distortion value and can provide a high-definition imaging effect.

[0086] In some embodiments, the optical lens satisfies the conditional formula: 15 mm < TTL < 17 mm, 3.5 mm < f < 4 mm, 160° < FOV < 170°, 10.9 mm < IH < 12 mm, 2.4 < Fno < 2.7, 30° < CRA < 35°, where TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field angle of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, Fno represents the aperture value of the optical lens, and CRA represents the chief ray angle of incidence at the maximum image height of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least one or more advantages such as a large image plane, a large field angle, miniaturization, etc.

[0087] In some embodiments, all seven lenses in the optical lens can 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, reduce the volume, and provide an optical lens product with higher cost performance.

[0088] In some embodiment modes, 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, in the optical lens provided by the present invention, the first lens and the third lens adopt spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt aspherical lenses.

[0089] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0090]

[0091] where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the conic coefficient, and B, C, D, E, F, G, H are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order respectively.

[0092] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0093] Example 1

[0094] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0095] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0096] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex near the optical axis;

[0097] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex;

[0098] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex, and its image-side surface S8 is convex;

[0099] The fifth lens L5 has positive refractive power, its object-side surface S9 is concave, and its image-side surface S10 is convex;

[0100] The sixth lens L6 has negative refractive power, its object-side surface S11 is concave, and its image-side surface S12 is concave;

[0101] The seventh lens L7 has positive refractive power, its object-side surface S13 is convex, and its image-side surface S14 is concave;

[0102] The object side surface S15 and the image side surface S16 of the filter G1 are both flat surfaces;

[0103] The imaging surface S17 is a plane.

[0104] 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 plastic aspherical lenses.

[0105] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0106] Table 1-1

[0107]

[0108]

[0109] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0110] Table 1-2

[0111] Face number K B C D E F G H S3 -2.25E+00 5.55E-03 -2.89E-04 -2.55E-05 3.30E-06 -1.01E-07 0.00E+00 0.00E+00 S4 -2.59E+01 6.35E-03 4.27E-04 -8.56E-05 5.09E-06 -5.19E-08 0.00E+00 0.00E+00 S7 1.09E+00 -8.69E-05 -3.45E-04 -5.30E-05 -1.50E-05 -3.96E-07 0.00E+00 0.00E+00 S8 2.47E+00 -1.73E-03 -6.42E-05 -3.40E-05 8.20E-06 -1.00E-07 0.00E+00 0.00E+00 S9 2.48E+01 -4.96E-03 -2.07E-04 -7.49E-06 -9.80E-05 4.93E-11 0.00E+00 0.00E+00 S10 -1.12E+01 -2.79E-02 -2.33E-04 1.96E-04 -1.68E-04 4.95E-11 0.00E+00 0.00E+00 S11 -2.03E+01 -2.93E-02 -3.90E-03 6.54E-04 -2.32E-04 4.93E-11 7.74E-13 1.21E-14 S12 -8.17E+01 -1.75E-03 -2.79E-04 1.60E-04 -1.11E-05 5.37E-11 0.00E+00 0.00E+00 S13 -1.26E+01 -2.48E-03 4.73E-04 -4.02E-05 1.77E-06 -3.23E-08 -6.08E-11 5.96E-13 S14 -1.07E+01 -4.45E-03 4.97E-04 -3.99E-05 2.60E-06 -1.41E-07 4.92E-09 -7.90E-11

[0112] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 shown.

[0113] Figure 2 A field curvature graph of the optical lens 100 in this embodiment is shown, showing 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 angle (unit: degrees). As can be seen from the graph, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, indicating that the optical lens 100 can effectively correct for field curvature.

[0114] Figure 3 The following figure shows the F-Theta distortion curve of the optical lens 100 in this embodiment, which represents the distortion at different field angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the distortion value is controlled within 0-7%, indicating that the optical lens 100 is able to correct distortion well.

[0115] Figure 4 The following is a graph showing the axial aberration of the optical lens 100 in this embodiment, which shows 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 graph, the offset of the axial aberration is controlled within ±0.02mm, indicating that the optical lens 100 is able to effectively correct the axial aberration.

[0116] Figure 5A graph showing the vertical chromatic aberration of the optical lens 100 in this embodiment shows the chromatic aberration of each wavelength relative to the central wavelength (0.546 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±1 μm, indicating that the optical lens 100 is capable of effectively correcting chromatic aberration.

[0117] Figure 6 A graph showing the MTF (Modulation Transfer Function) of the optical lens 100 in this embodiment shows the degree of lens imaging modulation at different spatial frequencies across various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF value of this embodiment is consistently above 0.58 across the entire field of view. Within the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, demonstrating excellent imaging quality and detail resolution at both low and high frequencies.

[0118] Example 2

[0119] See also Figure 7 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, this embodiment has the following main differences: the image-side surface S4 of the second lens element L2 is concave; the image-side surface S8 of the fourth lens element L4 is concave at the near optical axis; the object-side surface S9 of the fifth lens element L5 is convex at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0120] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0121] Table 2-1

[0122]

[0123]

[0124] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0125] Table 2-2

[0126] Face number K B C D E F G H S3 -4.77E-01 1.74E-03 4.16E-04 -7.53E-05 6.20E-06 -2.61E-07 1.81E-09 1.96E-10 S4 -2.00E+02 2.75E-03 4.92E-04 -6.27E-05 -1.68E-06 9.44E-07 -9.94E-08 3.91E-09 S7 1.09E+00 -2.99E-03 1.92E-04 -1.34E-04 6.73E-06 -1.56E-06 -1.62E-07 -1.08E-08 S8 2.00E+02 -9.88E-04 2.41E-03 -4.64E-03 4.28E-03 -2.25E-03 5.98E-04 -6.34E-05 S9 1.31E+02 -1.31E-02 -4.50E-03 1.42E-03 -6.39E-03 6.39E-03 -3.18E-03 5.71E-04 S10 -7.05E+00 -4.28E-02 7.07E-04 7.05E-04 -4.81E-04 -1.48E-04 9.59E-05 -2.00E-05 S11 3.77E+00 -4.19E-03 -5.73E-03 2.69E-03 -6.95E-04 1.18E-04 -1.22E-05 1.10E-06 S12 -7.94E+01 3.97E-03 1.35E-05 -2.56E-04 9.75E-05 -1.63E-05 1.11E-06 -1.22E-08 S13 -8.76E+00 -3.70E-03 4.93E-04 -4.13E-05 2.24E-06 -8.62E-08 2.45E-09 -4.17E-11 S14 -5.30E+00 -6.32E-03 7.51E-04 -7.03E-05 4.73E-06 -2.17E-07 5.86E-09 -7.10E-11

[0127] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, vertical chromatic aberration curve, and MTF curve of the optical lens 200 are shown in FIG. Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 shown.

[0128] from Figure 8 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.03 mm, indicating that the optical lens 200 can correct the field curvature well.

[0129] from Figure 9 It can be seen from the figure that the distortion value is controlled within 0-6%, indicating that the optical lens 200 can correct the distortion well.

[0130] from Figure 10 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0131] from Figure 11 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0132] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.5 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, achieving good imaging quality and detail resolution in both low-frequency and high-frequency conditions.

[0133] Example 3

[0134] See also Figure 13 , shown is a schematic structural diagram of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0135] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0136] Table 3-1

[0137]

[0138] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0139] Table 3-2

[0140] Face number K B C D E F G H S3 -2.86E+00 2.62E-03 -2.48E-04 4.94E-06 2.21E-07 -8.64E-09 0.00E+00 0.00E+00 S4 -2.00E+02 6.75E-03 5.62E-05 -2.35E-05 1.20E-06 -1.77E-08 0.00E+00 0.00E+00 S7 2.37E+00 -6.23E-04 -6.07E-04 -3.52E-05 -3.82E-05 -3.96E-07 0.00E+00 0.00E+00 S8 2.00E+02 -3.12E-03 -2.94E-04 -1.50E-04 4.32E-05 -1.00E-07 0.00E+00 0.00E+00 S9 5.30E+01 -5.86E-03 -5.58E-04 -1.94E-04 -3.61E-05 4.93E-11 0.00E+00 0.00E+00 S10 -9.30E+00 -2.37E-02 -3.10E-03 8.75E-04 -2.37E-04 4.95E-11 0.00E+00 0.00E+00 S11 -7.89E+00 -2.44E-02 -6.13E-03 1.35E-03 -2.93E-04 4.93E-11 7.74E-13 1.21E-14 S12 -7.10E+01 -6.52E-03 1.07E-03 -2.83E-05 -6.20E-07 5.37E-11 0.00E+00 0.00E+00 S13 -1.89E+01 -1.60E-03 3.38E-04 -3.07E-05 1.26E-06 -2.58E-09 -1.57E-09 3.03E-11 S14 -1.53E+00 -7.95E-03 7.78E-04 -5.96E-05 3.33E-06 -1.36E-07 3.57E-09 -4.77E-11

[0141] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, vertical axis chromatic aberration curve, and MTF curve of the optical lens 300 are shown as follows: Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 shown.

[0142] from Figure 14 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.02 mm, indicating that the optical lens 300 can correct the field curvature well.

[0143] from Figure 15 It can be seen from the figure that the distortion value is controlled within 0-5%, indicating that the optical lens 300 can correct the distortion well.

[0144] from Figure 16 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.01 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0145] from Figure 17 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0146] from Figure 18 As can be seen, the MTF value of this embodiment is above 0.6 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, achieving good imaging quality and detail resolution in both low-frequency and high-frequency conditions.

[0147] Please refer to Table 4, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, chief ray incidence angle CRA at the maximum image height, maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0148] Table 4

[0149]

[0150]

[0151] In summary of the above embodiments, the optical lens provided by the present invention adopts a seven-piece glass-plastic hybrid structure. Through a specific surface shape setting and a reasonable optical focal length distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as a large field of view angle, a large aperture, a large image height, a high pixel, small distortion, and high imaging quality.

[0152] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0153] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: The first lens has a negative optical power, its object-side surface is convex and its image-side surface is concave; a second lens having negative optical power and a concave object-side surface; a third lens element having positive optical power, whose object-side surface is convex and whose image-side surface is convex; a fourth lens element having positive optical power and a convex object-side surface; a fifth lens element having positive refractive power and a convex image-side surface; a sixth lens element having negative optical power, whose object-side surface and image-side surface are concave; a seventh lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is concave; The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy the following conditions: 1.3 <TTL / IH<1.6。 2. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 50°<(f×FOV) / IH<60°.

3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.7 <f1 / f<-1.6。 4. The optical lens according to claim 1, wherein: A curvature radius R13 of the object side surface of the seventh lens and a curvature radius R14 of the image side surface of the seventh lens satisfy: -22<(R13+R14) / (R13-R14)<76.

5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 11 <f7 / f<35。 6. The optical lens according to claim 1, wherein: The object side curvature radius R1 of the first lens and the image side curvature radius R2 of the first lens satisfy: <R1 / R2<5。 7. The optical lens according to claim 1, wherein: The distance CT56 between the fifth lens and the sixth lens on the optical axis and the center thickness CT5 of the fifth lens satisfy: 0.08 <CT56 / CT5<0.1。 8. The optical lens according to claim 1, wherein: The object side light semi-aperture sag height SAG71 of the seventh lens, the image side light semi-aperture sag height SAG72 of the seventh lens and the center thickness CT7 of the seventh lens satisfy: -0.5<(SAG72-SAG71) / CT7<-0.

15.

9. The optical lens according to claim 1, wherein: The object side light semi-aperture DM11 of the first lens and the image side light semi-aperture DM72 of the seventh lens meet the following conditions: 1.2 <DM11 / DM72<1.4。 10. The optical lens according to claim 1, wherein: The true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens meet the following requirements: <IH / EPD<8.5。

Images