Optical lens

Abstract

The present invention provides an optical lens having seven lenses, which include, in order from the object side to the imaging surface along the optical axis: a first lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens having negative optical power, whose image side surface is concave; a third lens having positive optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens having positive optical power, whose object side surface is convex; a fifth lens having positive optical power, whose image side surface is convex; a sixth lens having negative optical power, whose object side surface is concave and whose image side surface is convex; and a seventh lens having positive optical power, whose object side surface is concave and whose image side surface is convex. The optical lens provided by the present invention has one or more advantages such as small aperture, short total length, large aperture, and high imaging quality through specific surface shape matching and reasonable optical power distribution.

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] In the field of modern sports image capture, high-performance portable optical systems are a core requirement. Currently available action camera lenses often feature large apertures and ultra-wide angles to accommodate high-speed action scenes and extreme environments. However, these traditional optical structures generally suffer from reduced image quality in low-light environments and insufficient dynamic range. Furthermore, complex optical compensation mechanisms are often employed to improve image stabilization, resulting in increased lens module size and weight. This not only limits the device's suitability for extreme sports scenarios but also significantly increases production and maintenance costs. Summary of the Invention

[0003] In view of the above problems, the object of the present invention is to provide an optical lens having one or more advantages such as small aperture, short total length, large aperture, and high 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 element having negative optical power and a concave image-side surface;

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

[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 is concave and whose image-side surface is convex;

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

[0012] The total optical length TTL of the optical lens satisfies: 6mm <TTL<6.9mm;

[0013] The semi-aperture DM11 of the object side of the first lens satisfies: 2.5mm <DM11<3mm;

[0014] The image side light semi-aperture DM72 of the seventh lens satisfies: 0.8mm <DM72<1.5mm。

[0015] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.4 < TTL / f < 9.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3 < f2 / f < -1.5; 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: 0.5 < (R3 + R4) / (R3 - R4) < 1.2.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.5 < f4 / f < 3; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -1.5 < (R7 + R8) / (R7 - R8) < -0.8.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 1; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0.8 < (R9 + R10) / (R9 - R10) < 1.3.

[0019] Further preferably, the maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 1.7 < Fno < 1.9; 75° < FOV / Fno < 100°.

[0020] Further preferably, the air gap d23 between the second lens and the third lens on the optical axis, the air gap d34 between the third lens and the fourth lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0 < (d23 + d34) / TTL < 0.06.

[0021] Further preferably, the air gap d45 between the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0 < d45 / TTL < 0.03.

[0022] Further preferably, the incident angle CRA of the chief ray at the maximum image height of the optical lens on the imaging surface satisfies the following conditional formula: 15° < CRA < 25°.

[0023] Further preferably, the true image height IH corresponding to the maximum field of view of the optical lens and the total optical length TTL of the optical lens satisfy: 2.5 mm < IH < 3.5 mm; 3.5 < IH / f < 4.2.

[0024] Compared with the existing technology, the optical lens provided by the present invention uses seven lenses with specific optical focal lengths. Through the combination of specific surface shapes and 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 small aperture, short total length, large aperture, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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:

[0026] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0027] Figure 2 Graph showing the field curvature of the optical lens in Example 1 of the present invention.

[0028] Figure 3 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0029] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0030] Figure 5 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0031] Figure 6 This is a graph of the field curvature of the optical lens in Example 2 of the present invention.

[0032] Figure 7 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0033] Figure 8 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0034] Figure 9 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0035] Figure 10 This is a graph of the field curvature of the optical lens in Example 3 of the present invention.

[0036] Figure 11 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0037] Figure 12 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0038] Figure 13 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0039] Figure 14 This is a graph of the field curvature of the optical lens in Example 4 of the present invention.

[0040] Figure 15 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0041] Figure 16 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 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 may be concave or convex, and its image-side surface is concave. The third lens may have positive optical power, its object-side surface is convex, and its image-side surface is concave. The fourth lens may have positive optical power, its object-side surface is convex, and its image-side surface may be concave or convex. The fifth lens may have positive optical power, its object-side surface may be 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 convex. The seventh lens may have positive optical power, its object-side surface is concave, and its image-side surface is convex.

[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, which is 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 satisfies: 6mm < TTL < 6.9mm; the clear aperture radius DM11 of the object side surface of the first lens satisfies: 2.5mm < DM11 < 3mm; the clear aperture radius DM72 of the image side surface of the seventh lens satisfies: 0.8mm < DM72 < 1.5mm. Meeting the above ranges enables the optical lens to have a short total length, effectively limits the length and volume of the optical lens, and realizes miniaturization of the optical lens; at the same time, limiting the apertures of the first lens and the last lens is conducive to better realizing miniaturization and portability of the device.

[0055] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.4 < TTL / f < 9. Meeting the above range ensures a balance between the optical performance and the volume compactness of the lens.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3 < f2 / f < -1.5; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.5 < (R3 + R4) / (R3 - R4) < 1.2. Meeting the above ranges allows for reasonable setting of the focal length and surface shape of the second lens, which is conducive to sharing a part of the negative optical power, reducing the pressure of the negative optical power of the first lens, and at the same time is conducive to converging the marginal field light, avoiding excessive light deflection angles so that the light can transition smoothly, and helps to correct the aberration generated by the light passing through the first lens, improving the imaging quality of the optical lens.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.5 < f4 / f < 3; the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -1.5 < (R7 + R8) / (R7 - R8) < -0.8. Meeting the above ranges can make the fourth lens have appropriate positive optical power and surface shape, avoid affecting the optical performance due to overly extreme shapes, be conducive to slowing down the light turning trend and reducing the light height, making the light trend transition smoothly, and at the same time be conducive to reducing the correction difficulty of spherical aberration and field curvature, improving the imaging quality of the optical lens.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 1; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.8 < (R9 + R10) / (R9 - R10) < 1.3. Meeting the above ranges enables the fifth lens to optimize the control of the lens over obliquely incident light, which is beneficial to correcting the field curvature and distortion of the imaging optical lens, effectively correcting aberration, and improving the imaging quality.

[0059] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 1.7 < Fno < 1.9; 75° < FOV / Fno < 100°. Meeting the above ranges realizes the large aperture characteristic and improves the imaging quality in low light environments.

[0060] In some embodiments, the air gap d23 between the second lens and the third lens on the optical axis, the air gap d34 between the third lens and the fourth lens on the optical axis, and the total optical length TTL of the optical lens satisfy: 0 < (d + d34) / TTL < 0.06. Meeting the above ranges ensures that the gaps between the second, third, and fourth lenses are not too large, thus avoiding excessive increase in the lens length.

[0061] In some embodiments, the air gap d45 between the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0 < d45 / TTL < 0.03. Meeting the above ranges can reduce the energy level of ghost images reflected between lenses on the basis of meeting the miniaturization of the optical lens, achieving miniaturization and weak ghost images.

[0062] In some embodiments, the incident angle CRA of the chief ray at the maximum image height of the optical lens on the imaging surface satisfies the following conditional formula: 15° < CRA < 25°. When CRA meets the above range, there can be a relatively large allowable error range between the CRA of the optical lens and the CRA of the chip photosensitive element, enhancing the adaptability of the optical lens to the image sensor.

[0063] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the total optical length TTL of the optical lens satisfy: 2.5 mm < IH < 3.5 mm; 3.5 < IH / f < 4.2. Meeting the above ranges allows the optical lens to cover a wider field of view and balance the relationship between wide angle and image quality.

[0064] 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: 2 < R1 / R2 < 3. Meeting the above range can reasonably set the surface shape of the first lens, enhance the light collection ability of the first lens, and thus achieve an ultra-large field of view angle.

[0065] 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: -5 < R3 / R4 < 50. By satisfying the above range and restricting R3 / R4 within a reasonable range, it is beneficial for light rays with a large field angle to enter the optical lens, thereby reducing the front aperture diameter and achieving miniaturization.

[0066] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.7 < R5 / R6 < 0.9. By satisfying the above range and reasonably setting the surface shape of the third lens, it is beneficial for the smooth transition of light rays, facilitating the correction of field curvature and improving the imaging quality of the optical lens.

[0067] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively and the total optical length TTL of the optical lens satisfy: 0.55 < ∑CT / TTL < 0.65. By satisfying the above range, the total length of the optical lens can be effectively compressed, and at the same time, it is beneficial for the structural design and production process of the optical lens.

[0068] In some embodiments, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM72 of the image side surface of the seventh lens satisfy: 2 < DM11 / DM72 < 2.8. By satisfying the above range and reasonably setting the ratio of the apertures of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance of miniaturization and high pixels.

[0069] In some embodiments, 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 satisfy: 6.5 < IH / EPD < 7.5. By satisfying the above range and reasonably controlling the relationship between the image height and the entrance pupil diameter, it helps to increase the width of the light beam entering the optical lens, improve the relative illuminance of the edge field, and improve the imaging quality.

[0070] In some embodiments, the seven lenses in the optical lens can all adopt plastic lenses or adopt a structure with a combination of glass and plastic materials. Preferably, the optical lens of the present invention adopts a structure of seven lenses with a combination of glass and plastic, which can enable the optical lens to better match a large target surface chip to achieve high-definition imaging, and at the same time can also achieve a reasonable balance of miniaturization, large image surface, and large wide angle of the optical lens. Specifically, the first lens, the fourth lens, and the seventh lens can adopt glass lenses, and the second lens, the third lens, the fifth lens, and the sixth lens are all plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce volume, and provide an optical lens product with higher cost performance.

[0071] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh lenses may be spherical or aspherical lenses. Compared to spherical lenses, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number and size of lenses and achieving better miniaturization. More specifically, in the optical lens provided by the present invention, the first and fourth lenses may be spherical lenses, while the second, third, fifth, sixth, and seventh lenses may be aspherical lenses.

[0072] In various embodiments of the present invention, when the lens is an aspheric lens, the shapes of the aspheric surfaces of the optical lens satisfy the following equations:

[0073] ;

[0074] Where z is the distance between the surface and the vertex in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients, respectively.

[0075] 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.

[0076] Example 1

[0077] 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.

[0078] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0079] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is concave;

[0080] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0081] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex, and its image-side surface S8 is concave;

[0082] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex, and its image-side surface S10 is convex;

[0083] The sixth lens L6 has negative refractive power, its object-side surface S11 is concave, and its image-side surface S12 is convex;

[0084] The seventh lens L7 has positive refractive power, its object-side surface S13 is concave, and its image-side surface S14 is convex;

[0085] The object side surface S15 and the image side surface S16 of the filter G1 are both flat surfaces;

[0086] The imaging surface S17 is a plane.

[0087] The first lens L1 and the fourth lens L4 are glass spherical lenses; the seventh lens L7 is a glass aspherical lens; the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all plastic aspherical lenses.

[0088] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0089] Table 1-1

[0090]

[0091] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0092] Table 1-2

[0093]

[0094] In this embodiment, the field curvature curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 、 Figure 3 、 Figure 4 shown.

[0095] Figure 2 The field curvature curves for Example 1 are shown, representing the degree of curvature of light of different wavelengths 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 figure, the field curvature of the meridional and sagittal image planes is controlled within a range of -0.1mm to 0.2mm, demonstrating that the optical lens is capable of effectively correcting field curvature.

[0096] Figure 3The following figure shows the axial aberration curve 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 figure, the offset of the axial aberration is controlled within -0.05mm to 0.03mm, indicating that the optical lens 100 is able to effectively correct the axial aberration.

[0097] Figure 4 A graph of vertical chromatic aberration for the optical lens 100 in this embodiment shows the chromatic aberration of each wavelength relative to the central wavelength (0.555 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 ±2 μm, indicating that the optical lens 100 is capable of effectively correcting chromatic aberration.

[0098] Example 2

[0099] See also Figure 5 , 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 S8 of the fourth lens L4 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0100] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0101] Table 2-1

[0102]

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

[0104] Table 2-2

[0105]

[0106] In this embodiment, the field curvature curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 200 are shown as follows: Figure 6 、 Figure 7 、 Figure 8 As shown. Figure 6 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.1mm~0.2mm, indicating that the optical lens 200 can correct the field curvature well. Figure 7 It can be seen from the graph that the offset of the axial aberration is controlled within the range of -0.05mm to 0, indicating that the optical lens 200 can correct the axial aberration well. Figure 8It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~2μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0107] Example 3

[0108] See also Figure 9 , shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S9 of the fifth lens L5 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0109] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0110] Table 3-1

[0111]

[0112] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0113] Table 3-2

[0114]

[0115] In this embodiment, the field curvature curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 、 Figure 11 、 Figure 12 As shown. Figure 10 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.1mm~0.2mm, indicating that the optical lens 300 can well correct the field curvature. Figure 11 It can be seen from the graph that the offset of the axial aberration is controlled within the range of -0.05mm~0.02mm, indicating that the optical lens 300 can correct the axial aberration well. Figure 12 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~4μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0116] Example 4

[0117] See also Figure 13 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S3 of the second lens L2 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0118] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0119] Table 4-1

[0120]

[0121] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0122] Table 4-2

[0123]

[0124] In this embodiment, the field curvature curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 14 、 Figure 15 、 Figure 16 As shown. 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 ±0.15mm, indicating that the optical lens 400 can well correct the field curvature. Figure 15 It can be seen from the graph that the offset of the axial aberration is controlled within the range of -0.04mm~0.02mm, indicating that the optical lens 400 can correct the axial aberration well. Figure 16 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~2μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0125] Please refer to Table 5, 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, incident angle CRA of the chief ray on the imaging surface at the maximum image height, maximum field of view FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0126] Table 5

[0127]

[0128] In summary, the optical lens provided by the present invention utilizes a seven-piece glass-plastic hybrid structure. Through specific surface configurations and rational optical power distribution, the optical lens achieves a relatively compact structure, effectively shortening its overall length while maintaining a small aperture, thus facilitating miniaturization. Its large aperture enables high-definition imaging even in relatively dark environments. Furthermore, it can effectively correct for overall aberrations in the optical lens, improving its imaging quality.

[0129] 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.

[0130] 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: It successively includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose image side is concave; A third lens with positive optical power, whose object side is convex and whose image side is concave; A fourth lens with positive optical power, whose object side is convex; A fifth lens with positive optical power, whose image side is convex; A sixth lens with negative optical power, whose object side is concave and whose image side is convex; A seventh lens with positive optical power, whose object side is concave and whose image side is convex; Among them, the total optical length TTL of the optical lens satisfies: 6mm < TTL < 6.9mm; The clear aperture semi-diameter DM11 of the object side of the first lens satisfies: 2.5mm < DM11 < 3mm; The clear aperture semi-diameter DM72 of the image side of the seventh lens satisfies: 0.8mm < DM72 < 1.5mm.

2. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.4 < TTL / f < 9.

3. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3 < f2 / f < -1.5; The curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.5 < (R3 + R4) / (R3 - R4) < 1.

2.

4. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.5 < f4 / f < 3; The curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -1.5 < (R7 + R8) / (R7 - R8) < -0.

8.

5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 1; The curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 0.8 < (R9 + R10) / (R9 - R10) < 1.

3.

6. The optical lens according to claim 1, wherein: The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 1.7 < Fno < 1.9; 75° < FOV / Fno < 100°.

7. The optical lens according to claim 1, wherein: The air gap d23 between the second lens and the third lens on the optical axis, the air gap d34 between the third lens and the fourth lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0 < (d23 + d34) / TTL < 0.

06.

8. The optical lens according to claim 1, wherein: The air gap d45 between the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0 < d45 / TTL < 0.

03.

9. The optical lens according to claim 1, wherein: The incident angle CRA of the chief ray at the maximum image height of the optical lens on the imaging surface satisfies the following conditional formula: 15° < CRA < 25°.

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 total optical length TTL of the optical lens satisfy: 2.5mm < IH < 3.5mm; 3.5 < IH / f < 4.2.

Images