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 convex; a fourth lens having positive optical power, whose object side surface is convex at the near optical axis; a fifth lens having positive optical power, whose object side surface is convex and whose image side surface is concave at the near optical axis; a sixth lens having positive optical power, whose object side surface is convex at the near optical axis and whose image side surface is convex; and a seventh lens having negative optical power, whose object side surface is concave. The optical lens provided by the present invention can reasonably correct the overall aberration of the optical lens through a specific surface shape setting and reasonable optical power distribution, so that the optical lens has one or more advantages such as large aperture, miniaturization, and high imaging quality.

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 rapid development of electronic devices (laptops, tablets, mobile phones, etc.), imaging devices are rapidly becoming ubiquitous in modern video conferencing. As these devices become increasingly miniaturized, the demand for smaller optical lenses within them is intensifying. However, traditional optical lenses used for video conferencing are often bulky and cannot meet these miniaturization requirements. Furthermore, traditional optical lenses suffer from poor image quality, especially in dimly lit environments, failing to meet the high-definition imaging requirements of video conferencing. Striking a balance between miniaturization and high image quality in video conferencing imaging lenses is a pressing challenge. 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 large aperture, miniaturization, and high imaging quality.

[0004] The technical solution adopted in the present invention is:

[0005] An optical lens, comprising seven lenses, including the following elements in order from the object side to the imaging surface along the optical axis:

[0006] The first lens has a negative optical power, its object-side surface is convex and its image-side surface is concave;

[0007] a second lens element having negative optical power and a concave image-side surface;

[0008] a third lens element having positive optical power, whose object-side surface is convex and whose image-side surface is convex;

[0009] a fourth lens element having positive optical power and a convex object-side surface near the optical axis;

[0010] The fifth lens element has positive refractive power, its object-side surface is convex, and its image-side surface is concave near the optical axis;

[0011] a sixth lens element having positive refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is convex;

[0012] a seventh lens element having negative optical power and a concave object-side surface;

[0013] The total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 5.5mm <TTL / Fno<6.5mm。

[0014] Further preferably, the total optical length TTL 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: 4<(TTL×tan(FOV / 2)) / (IH / 2)<4.5.

[0015] 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 satisfy: 4.9 <IH / EPD<5.4。

[0016] Further preferably, the maximum field of view FOV of the optical lens and the chief ray incidence angle CRA at the maximum image height of the optical lens satisfy: 3.1 <FOV / CRA<3.5。

[0017] Further preferably, the total optical length TTL of the optical lens and the sum ΣCT of the center thicknesses of the first lens to the seventh lens on the optical axis respectively satisfy: 1.9 <TTL / ∑CT<2.1。

[0018] Further preferably, the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1 <f47 / f<1.2。

[0019] Further preferably, the combined focal length f13 of the first lens, the second lens and the third lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -3.5 <f13 / f47<-2.4。

[0020] Further preferably, the focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -0.7 <f1 / (R1+R2)<-0.1。

[0021] Further preferably, the object side curvature radius R1 of the first lens and the sag height SAGX11 corresponding to the maximum clear semi-aperture of the object side end of the first lens satisfy: <R1 / SAGX11<21。

[0022] Further preferably, the semi-aperture CSD11 of the first lens on the object side and the semi-aperture CSD71 of the seventh lens on the object side satisfy the following conditions: 1.2 <CSD11 / CSD71<1.6。

[0023] Compared with the existing technology, the optical lens provided by the present invention has a small size through a specific surface shape setting and reasonable optical focal length distribution; it can also achieve a large image height of the lens and can be used with a large target surface chip, which is beneficial to improving the lens resolution and image detail restoration; the lens has a large aperture, which can achieve high-definition imaging even in dim environments; it can also reasonably correct the overall aberration of the optical lens, so that the optical lens has high pixels and improves the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0026] Figure 2 4 is an astigmatism curve diagram of the optical lens in Example 1 of the present invention.

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

[0028] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0029] Figure 5 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 6 Graph showing the astigmatism of the optical lens in Example 2 of the present invention.

[0031] Figure 7 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0032] Figure 8 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0033] Figure 9 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0034] Figure 10 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0035] Figure 11 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0036] Figure 12 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0037] Figure 13 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0038] Figure 14 4 is an astigmatism curve diagram of the optical lens in Example 4 of the present invention.

[0039] Figure 15 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0040] Figure 16 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0041] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The optical lens provided in an embodiment of the present invention comprises seven lenses, which are arranged 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.

[0050] 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 convex. The fourth lens may have positive optical power, its object-side surface is convex at the near optical axis, and its image-side surface may be concave or convex. The fifth lens may have positive optical power, its object-side surface is convex, and its image-side surface is concave at the near optical axis. The sixth lens may have positive optical power, its object-side surface is convex at the near optical axis, and its image-side surface is convex. The seventh lens may have negative optical power, its object-side surface is concave, and its image-side surface may be concave or convex.

[0051] In some embodiments, the optical lens may further include an aperture, which may be located between the third lens and the fourth lens. It is understood that the aperture is used to limit the amount of light entering to change the brightness of the image.

[0052] In some embodiments, the optical lens may further include a filter, which 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.

[0053] In some embodiments, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 5.5mm < TTL / Fno < 6.5mm. By satisfying the above conditional formula and controlling the relationship between the total length and the aperture value of the optical lens, it is ensured that the optical lens can meet the requirements of large aperture and miniaturized design, enabling the optical lens to obtain sufficient light transmission in a dim environment and meeting the needs of high-quality and high-definition shooting.

[0054] In some embodiments, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 4 < (TTL × tan(FOV / 2)) / (IH / 2) < 4.5. By satisfying the above conditional formula, the requirements of the image height and the total optical length of the optical lens can be effectively balanced, the length of the optical lens can be effectively limited, which is beneficial to the miniaturization of the optical lens; at the same time, by controlling the maximum field angle of the optical lens and the true image height corresponding to the maximum field angle, the optical distortion of the optical lens can be controlled and the overall resolution can be improved.

[0055] 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: 4.9 < IH / EPD < 5.4. By satisfying the above conditional formula, an optical lens with a large image plane can have a relatively large entrance pupil diameter and a high light transmission, thereby increasing the imaging effect when the optical lens works in a dark environment and reducing the aberration of the edge field of view.

[0056] In some embodiments, the maximum field angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3.1 < FOV / CRA < 3.5. By satisfying the above conditional formula, by limiting the ratio of the field angle to the chief ray angle of incidence, the optical lens has a relatively large field angle to meet the requirements of large field angles of electronic devices such as mobile phones and laptop computers. At the same time, by reducing the angle of the chief ray incident on the imaging surface, the photosensitive performance of the photosensitive element can be improved, which is beneficial to improving the imaging quality of the optical lens.

[0057] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis respectively satisfy: 1.9 < TTL / ∑CT < 2.1. By satisfying the above conditional formula, reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of each lens helps to achieve high pixel characteristics and improve the imaging quality of the optical lens; at the same time, it can effectively shorten the total optical length of the optical lens and meet the requirements of miniaturized and lightweight design.

[0058] In some embodiments, the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the optical lens satisfy: 1 < f47 / f < 1.2. By satisfying the above conditional formula, by reasonably controlling the ratio of the combined focal length of the fourth lens, the fifth lens, the sixth lens, and the seventh lens to the effective focal length of the optical lens, it is beneficial to control the angle of light rays exiting the optical lens, reduce the aberration generated by the optical lens, and be able to reduce the outer diameters of the fourth lens to the seventh lens, meeting the miniaturization design requirements; it can also correct the influence of the field curvature generated by the front lenses on the resolution, effectively ensuring the imaging quality of the optical lens.

[0059] In some embodiments, the combined focal length f13 of the first lens, the second lens, and the third lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: -3.5 < f13 / f47 < -2.4. By satisfying the above conditional formula, the lens group composed of the first lens, the second lens, and the third lens as a whole has a negative optical power, which is beneficial for a large-angle light beam to enter the optical lens, meeting the large field angle requirement of the optical lens and enhancing the brightness of the image plane of the optical lens; while the lens group composed of the fourth lens, the fifth lens, the sixth lens, and the seventh lens as a whole has a positive optical power, which can control the height of the light rays exiting the optical lens, reduce the aberration of the optical lens and the outer diameters of the lenses of the optical lens, meeting the miniaturization design requirements.

[0060] In some embodiments, the focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -0.7 < f1 / (R1 + R2) < -0.1. By satisfying the above conditional formula, the surface shapes of the object side surface and the image side surface of the first lens can be constrained, which is beneficial for reducing the bending degree of the light rays at the image side surface of the first lens, reducing the astigmatism amount of the optical lens, to balance the astigmatism problem brought by the large field angle of the optical lens, so that the astigmatism is not too large while the optical lens has a large field of view, thereby ensuring that the optical lens has excellent imaging quality.

[0061] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the sagittal height SAGX11 corresponding to the maximum clear aperture at the object side end of the first lens satisfy: 4 < R1 / SAGX11 < 21. By satisfying the above conditional formula, the ratio relationship between the curvature radius of the object side surface of the first lens and the sagittal height at the maximum effective aperture can be controlled, providing 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.

[0062] In some embodiments, the clear aperture diameter CSD11 of the object side end of the first lens and the clear aperture diameter CSD71 of the object side end of the seventh lens satisfy: 1.2 < CSD11 / CSD71 < 1.6. Satisfying the above conditional formula enables the optical lens to have a smaller aperture size, facilitating its mounting on thin and light electronic devices; meanwhile, it ensures that the optical lens can collect light at large angles, achieve large field angle imaging of the optical lens, increase the imaging area of the optical lens, and improve the imaging quality.

[0063] 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: 2.4 < IH / f < 2.7. Satisfying the above conditional formula ensures the imaging quality and miniaturization requirements of the optical lens.

[0064] 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 maximum field angle FOV of the optical lens satisfy: 0.6 < (IH / 2) / (f × tan(FOV / 2)) < 0.8. Satisfying the above conditional formula can control the edge distortion of the optical lens, is beneficial to achieving the large field angle and large image plane characteristics of the optical lens, and at the same time can effectively increase the proportion of the edge field of the optical lens in the entire image plane, enabling the optical lens to meet the high pixel characteristics and improving the imaging quality of the optical lens.

[0065] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.6 < f1 / f < -1.1. Satisfying the above conditional formula and setting the first lens of the optical lens as a lens with a negative optical power can capture the light rays entering the optical lens at large angles, expand the field angle range of the optical lens; meanwhile, it is also beneficial to reducing the sensitivity of the optical lens and realizing the miniaturized design of the optical lens.

[0066] In some embodiments, the combined focal length f13 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy: -3.7 < f13 / f < -2.5. Satisfying the above conditional formula and reasonably setting the value of f13 / f can optimize the optical powers of the first lens, the second lens, and the third lens, reduce the deflection angle of the large field incident light rays, lower the sensitivity of the optical lens, and can also reduce the head size of the optical lens to meet the small head design requirements.

[0067] 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: 1.2 < (R1 + R2) / (R1 - R2) < 1.9. Satisfying the above conditional formula and reasonably defining the shapes of the object side surface and the image side surface of the first lens can reduce the distortion generated by the first lens, reduce the difficulty of distortion correction for subsequent lenses, and contribute to improving the imaging quality.

[0068] In some embodiments, the sagittal height SAGX11 corresponding to the maximum clear aperture semi-diameter at the object side end of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 0.9 < SAGX11 / CT1 < 1.9. Satisfying the above conditional formula enables the optical lens to meet the small-aperture design requirements, which is conducive to compressing the central field of view of the optical lens and making the imaging quality of the edge field of view better.

[0069] In some embodiments, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis respectively satisfy: 0.3 < (CT3 + CT4 + CT5) / ∑CT < 0.5. Satisfying the above conditional formula and controlling the ratio of the sum of the central thicknesses of the third lens, the fourth lens, and the fifth lens to the sum of the central thicknesses of the first lens to the seventh lens on the optical axis is conducive to shortening the length of the optical lens, meeting the miniaturization design requirements, and is also conducive to the processing and manufacturing of the optical lens and optimizing the configuration of each lens.

[0070] In some embodiments, the optical lens satisfies the conditional formula: 11.5 mm < TTL < 12.6 mm; 3.9 mm < f < 4.4 mm; 115° < FOV < 125°; 1.9 mm < EPD < 2.2 mm; 1.9 < Fno < 2.2; 10.5 mm < IH < 10.7 mm; 3.2 mm < CSD11 < 3.7 mm; 2.8 mm < CSD72 < 3.7 mm; where TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CSD11 represents the clear aperture semi-diameter at the object side end of the first lens, and CSD72 represents the clear aperture semi-diameter at the image side end of the seventh lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least one or more of the advantages of miniaturization, large aperture, small aperture, large field of view angle, high pixel, and large image height.

[0071] 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. On the other hand, 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 optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance of miniaturization and high image quality of the lens.

[0072] In some embodiments, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens may be spherical lenses or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number and size of lenses, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens of the present invention may all be aspherical lenses, which can effectively reduce the aberrations of the optical lens, thereby reducing the number and size of lenses, and better achieving lens miniaturization.

[0073] 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:

[0074] ;

[0075] 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.

[0076] 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.

[0077] Example 1

[0078] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0079] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0080] The second lens L2 has negative refractive power, its object-side surface S3 is convex at the near optical axis, and its image-side surface S4 is concave;

[0081] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex;

[0082] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is convex;

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

[0084] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is convex;

[0085] The seventh lens L7 has negative refractive power, its object-side surface S13 is concave, and its image-side surface S14 is convex;

[0086] The object-side surface S15 and the image-side surface S16 of the filter G1 are both flat surfaces;

[0087] The imaging surface S17 is a plane.

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

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

[0090] Table 1-1

[0091]

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

[0093] Table 1-2

[0094]

[0095] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 、 Figure 3 、 Figure 4 shown.

[0096] Figure 2 The astigmatism curve of Example 1 is shown, which shows the astigmatism of light in the meridional image plane and the sagittal image plane. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0097] Figure 3 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, with the horizontal axis representing the axial aberration value (unit: mm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -0.03mm~0.04mm, indicating that the optical lens 100 is capable of correcting axial aberration well.

[0098] Figure 4 A graph of vertical chromatic aberration for Example 1 is shown. It plots the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within 0 to 2 μm, demonstrating that the optical lens 100 is capable of excellently correcting chromatic aberration across all viewing fields.

[0099] Example 2

[0100] 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 concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0101] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0102] Table 2-1

[0103]

[0104] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0105] Table 2-2

[0106]

[0107] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 、 Figure 7 、 Figure 8 shown.

[0108] from Figure 6 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can correct the astigmatism well.

[0109] from Figure 7It 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.

[0110] from Figure 8 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~2μm, indicating that the optical lens 200 can perfectly correct the chromatic aberration of each field of view.

[0111] Example 3

[0112] 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 image-side surface S14 of the seventh lens L7 is concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

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

[0114] Table 3-1

[0115]

[0116] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0117] Table 3-2

[0118]

[0119] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 、 Figure 11 、 Figure 12 shown.

[0120] from Figure 10 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the astigmatism well.

[0121] from Figure 11 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 300 can correct the axial aberration well.

[0122] from Figure 12 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~2μm, indicating that the optical lens 300 can perfectly correct the chromatic aberration of each field of view.

[0123] Example 4

[0124] 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 concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0125] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0126] Table 4-1

[0127]

[0128] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0129] Table 4-2

[0130]

[0131] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 14 、 Figure 15 、 Figure 16 shown.

[0132] from Figure 14 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct the astigmatism well.

[0133] from Figure 15 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 400 can correct the axial aberration well.

[0134] from Figure 16 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~2μm, indicating that the optical lens 400 can excellently correct the chromatic aberration of each field of view.

[0135] 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, maximum field of view angle FOV, chief ray incidence angle CRA at the maximum image height, and the numerical value corresponding to each conditional expression in each embodiment.

[0136] Table 5

[0137]

[0138] In summary of the above embodiments, the optical lens provided by the present invention has at least the following advantages:

[0139] The optical lens provided by the present invention has a small size through a specific surface shape setting and reasonable optical focal length distribution; it can also achieve a large image height of the lens and can be used with a large target surface chip, which is beneficial to improving the lens resolution and image detail restoration; the lens has a large aperture, which can achieve high-definition imaging even in dim environments; it can also reasonably correct the overall aberration of the optical lens, so that the optical lens has a high pixel and improves the imaging quality of the optical lens.

[0140] 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.

[0141] 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 a negative optical power, whose object side surface is convex and whose image side surface is concave; A second lens with a negative optical power, whose image side surface is concave; A third lens with a positive optical power, whose object side surface is convex and whose image side surface is convex; [[ID=u4]]A fourth lens with a positive optical power, whose object side surface is convex near the optical axis; A fifth lens with a positive optical power, whose object side surface is convex and whose image side surface is concave near the optical axis; A sixth lens with a positive optical power, whose object side surface is convex near the optical axis and whose image side surface is convex; A seventh lens with a negative optical power, whose object side surface is concave; Wherein, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 5.5mm < TTL / Fno < 6.5mm; The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.6 < f1 / f < -1.1; 115° < FOV < u25°, FOV represents the maximum field angle of the optical lens.

2. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 4 < (TTL × tan(FOV / 2)) / (IH / 2) < 4.

5.

3. 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 satisfy: 4.9 < IH / EPD < 5.

4.

4. The optical lens according to claim 1, wherein: The maximum field angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3.1 < FOV / CRA < 3.

5.

5. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens respectively on the optical axis satisfy: 1.9 < TTL / ∑CT < 2.

1.

6. The optical lens according to claim 1, wherein: The combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1 < f47 / f < 1.

2.

7. The optical lens according to claim 1, wherein: The combined focal length f13 of the first lens, the second lens and the third lens and the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -u.5 < f13 / f47 < -2.

4.

8. The optical lens according to claim 1, wherein:

9. The optical lens according to claim 1, wherein: The focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -0.7 < f1 / (R1+R2) < -0.

1.

10. The optical lens according to claim 1, wherein: The curvature radius R1 of the object side surface of the first lens and the sagitta SAGX11 corresponding to the maximum clear aperture radius at the object side end of the first lens satisfy: 4 < R1 / SAGX11 < 21. The clear aperture radius CSD11 at the object side end of the first lens and the clear aperture radius CSD71 at the object side end of the seventh lens satisfy: 1.2 < CSD11 / CSD71 < 1.6.

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