Optical lens

Abstract

The present invention provides an optical lens having seven lenses, which include, in order from the object side to the image side 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 positive optical power, whose object side surface is concave and whose image side surface is convex; a third lens having positive optical power, whose object side surface is convex and whose image side surface is convex; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens having negative optical power, whose image side surface is concave; and a seventh lens having positive optical power, whose object side surface is convex near the optical axis and whose image side surface is concave near the optical axis. 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 having positive refractive power, whose object-side surface is concave and whose image-side surface is convex;

[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 negative optical power;

[0010] a fifth lens having positive refractive power;

[0011] a sixth lens element having negative optical power and a concave image-side surface;

[0012] The seventh lens element has positive refractive power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis;

[0013] The combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy the following conditions: <f12 / f37<6.5。

[0014] Further preferably, 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 meet the following conditions: 1.1 <TTL / IH<1.3。

[0015] 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: 3.5<(TTL×tan(FOV / 2)) / (IH / 2)<3.8.

[0016] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 <f3 / f<0.9。

[0017] Further preferably, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 5.4 <f12 / f<8.2。

[0018] Further preferably, the radius of curvature R1 of the object side of the first lens and the sag SAGX11 corresponding to the maximum clear semi-aperture of the object side end of the first lens satisfy: 2.3 <R1 / SAGX11<3。

[0019] Further preferably, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the distance CT12 between the first lens and the second lens on the optical axis, and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 1.4<(CT1+CT2+CT3) / (CT12+CT23)<1.7.

[0020] Further preferably, a curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: 4.8<(R1+R2) / (R1-R2)<6.2.

[0021] Further preferably, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 5.5<(R3+R4) / (R3-R4)<6.2.

[0022] 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: -5.7 <f1 / (R1+R2)<-4。

[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 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0028] Figure 4 Graph showing 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] Figure 17 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0042] Figure 18 4 is an astigmatism curve diagram of the optical lens in Example 5 of the present invention.

[0043] Figure 19 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0044] Figure 20 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0045] Figure 21 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0046] Figure 22 4 is an astigmatism curve diagram of the optical lens in Example 6 of the present invention.

[0047] Figure 23 Graph showing the axial aberration of the optical lens in Example 6 of the present invention.

[0048] Figure 24 Graph showing vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0049] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In some embodiments, the first lens may have a negative optical power, with its object side being convex and its image side being concave. The second lens may have a positive optical power, with its object side being concave and its image side being convex. The third lens may have a positive optical power, with its object side being convex and its image side being convex. The fourth lens may have a negative optical power, and its object side may be concave or convex, and its image side may be concave or convex. The fifth lens may have a positive optical power, and its object side may be concave or convex, and its image side may be concave or convex. The sixth lens may have a negative optical power, and its object side may be concave or convex, and its image side is concave. The seventh lens may have a positive optical power, with its object side being convex near the optical axis and its image side being concave near the optical axis.

[0059] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the second lens and the third lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image formation.

[0060] In some embodiments, the optical lens may further include a filter, and the filter may be disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0061] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 4 < f12 / f37 < 6.5. Satisfying the above conditional formula is beneficial to ensuring that a large-angle light beam passes through the first lens and the second lens and enters the aperture, beneficial to reducing the aberration of the marginal field of view, improving the imaging quality, enabling the optical lens to have a certain large field of view angle, and improving the image plane brightness of the optical lens; at the same time, it is beneficial to control the height of the outgoing light beam of the optical lens to reduce the aberration of the optical lens and the outer diameter of each lens, meeting the requirements of miniaturization design.

[0062] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.1 < TTL / IH < 1.3. Satisfying the above conditional formula and reasonably configuring the overall optical length of the optical lens and the true image height corresponding to the maximum field of view angle can effectively shorten the overall optical length of the optical lens while ensuring that the optical lens has a high pixel count, enabling the optical lens to meet miniaturization requirements while having a high imaging quality.

[0063] 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: 3.5 < (TTL × tan(FOV / 2)) / (IH / 2) < 3.8. Meeting the above conditional formula can effectively balance the requirements of the image height and the total optical length of the optical lens, effectively limit the length of the optical lens, and is conducive 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.

[0064] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 0.9. Meeting the above conditional formula, by setting the third lens with a positive optical power and defining the ratio of the focal length of the third lens to the effective focal length of the optical lens, it is beneficial to adjust the light path from the first lens and the second lens, so that the optical lens has the characteristics of a certain large field angle, low sensitivity and miniaturization.

[0065] In some embodiments, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 5.4 < f12 / f < 8.2. Meeting the above conditional formula, the combined focal length of the first lens and the second lens is controlled within a reasonable range, which is beneficial to ensure that the optical lens meets a certain field angle and has a long focal length characteristic; at the same time, it can also prevent the incident light beam from being greatly deflected, reduce the aberration generated by the first lens and the second lens, and improve the imaging resolution of the optical lens, so as to obtain high-quality imaging.

[0066] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the sagitta SAGX11 corresponding to the maximum clear aperture at the object side end of the first lens satisfy: 2.3 < R1 / SAGX11 < 3. Meeting the above conditional formula can control the ratio relationship between the curvature radius of the object side surface of the first lens and the sagitta at the maximum effective aperture, provide a negative refractive power for the optical lens, so as to capture the light rays entering the optical lens at a large angle and expand the field angle range of the optical lens.

[0067] In some embodiments, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the spacing CT12 of the first lens and the second lens on the optical axis, and the spacing CT23 of the second lens and the third lens on the optical axis satisfy: 1.4 < (CT1 + CT2 + CT3) / (CT12 + CT23) < 1.7. Meeting the above conditional formula can effectively control the deflection of the marginal large field angle light rays, improve the relative illumination of the optical lens, and can also effectively control the reasonable distribution of the first three lenses in space, ensure that the optical lens has better assembly performance, and improve the production yield.

[0068] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 4.8 < (R1 + R2) / (R1 - R2) < 6.2. By satisfying the above conditional formula, by reasonably defining the shapes of the object side surface and the image side surface of the first lens, the distortion generated by the first lens can be reduced, the difficulty of distortion correction of the subsequent lenses can be reduced, and it is helpful to improve the imaging quality.

[0069] 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: 5.5 < (R3 + R4) / (R3 - R4) < 6.2. By satisfying the above conditional formula, the object side surface and the image side surface of the second lens can be made close to a concentric circle structure, the ability of the second lens to converge light can be reduced, and the function of smoothly transitioning light can be achieved.

[0070] In some embodiments, the focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, and the radius of curvature R2 of the image side surface of the first lens satisfy: -5.7 < f1 / (R1 + R2) < -4. 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 restricted, which is beneficial to reducing the bending degree of light at the image side surface of the first lens, reducing the astigmatism of the optical lens, so as to balance the astigmatism problem brought by the large field angle of the optical lens, so that while the optical lens has a large field of view, the astigmatism is not too large, and thus ensure that the optical lens has excellent imaging quality.

[0071] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 50° ≤ FOV / Fno ≤ 58°. By satisfying the above conditional formula, it can ensure that the optical lens meets a certain large field angle, reduce the influence of off-axis aberration on the system, and at the same time ensure the improvement of the brightness of the imaging surface, and thus improve the imaging quality.

[0072] 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: 1.9 < IH / f < 2.2. By satisfying the above conditional formula, the imaging quality and miniaturization requirements of the optical lens are ensured.

[0073] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -6 < f4 / f < -1. By satisfying the above conditional formula, as the intermediate lens of the imaging lens group, the negative refractive power provided by the fourth lens for the optical lens can better constrain the light beam, so it can be used to correct the chromatic aberration of the optical lens, and at the same time can perform intermediate correction on the aberration generated by the decentration difference of each lens on the object side, and reduce the correction pressure of the subsequent lens group.

[0074] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2.5 < f6 / f < -1.5. By satisfying the above conditional formula, the sixth lens is set as a negative lens, thereby providing a negative refractive power for the optical lens, which is beneficial to correcting the aberration of the optical lens and improving the imaging quality of the optical lens.

[0075] In some embodiments, the clear aperture diameter CSD11 at the object side end of the first lens and the clear aperture diameter CSD71 at the object side end of the seventh lens satisfy: 0.9 < CSD11 / CSD71 < 1.2. By satisfying the above conditional formula, the optical lens can have a smaller aperture size, which is convenient for being mounted on a thin and light electronic device; at the same time, it ensures that the optical lens can collect light at a large angle, realizes imaging with a large field angle of the optical lens, increases the imaging area of the optical lens, and improves the imaging quality.

[0076] In some embodiments, the central thickness CT1 of the first lens on the optical axis and the edge thickness ET1 of the first lens satisfy: 0.85 < CT1 / ET1 < 1.1. By satisfying the above conditional formula, by controlling the central thickness and the edge thickness of the first lens within a certain range, the aberration generated by the optical lens can be effectively balanced, and at the same time, it is also beneficial to the field curvature adjustment in engineering production, which is further beneficial to improving the imaging quality of the optical lens.

[0077] In some embodiments, the optical lens satisfies the conditional formula: 11.5 mm < TTL < 12.5 mm; 4.6 mm < f < 5.1 mm; 110° < FOV < 130°; 2.2 mm < EPD < 2.5 mm; 1.9 < Fno < 2.3; 9.5 mm < IH < 11 mm; 2 mm < CSD11 < 3.8 mm; 2 mm < CSD12 < 3 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 angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, CSD11 represents the clear aperture diameter at the object side end of the first lens, and CSD12 represents the clear aperture diameter at the image side end of the first lens. By satisfying the above conditions, it shows that the optical lens provided by the embodiments of the present invention has at least one or more advantages of miniaturization, large aperture, small aperture, large field angle, high pixel, and large image height.

[0078] In some embodiments, the lens material of the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Alternatively, when the lens material is glass, the inherent low dispersion of glass can be used to effectively correct the geometric chromatic aberration of the optical system. The optical lens provided by the present invention can utilize an all-plastic lens structure, which not only provides excellent imaging performance but also makes the lens structure more compact, effectively achieving a balance between miniaturization and high image quality.

[0079] 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.

[0080] 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:

[0081] ;

[0082] 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.

[0083] 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.

[0084] Example 1

[0085] 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, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0086] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0087] The second lens L2 has positive refractive power, its object-side surface S3 is concave, and its image-side surface S4 is convex;

[0088] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex;

[0089] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave;

[0090] The fifth lens L5 has positive refractive power, its object-side surface S9 is concave, and its image-side surface S10 is convex near the optical axis;

[0091] The sixth lens L6 has negative refractive power, its object-side surface S11 is convex, and its image-side surface S12 is concave;

[0092] The seventh lens L7 has positive refractive power, its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is concave near the optical axis;

[0093] The object-side surface S15 and the image-side surface S16 of the filter G1 are both flat surfaces;

[0094] The imaging surface S17 is a plane.

[0095] 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.

[0096] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0097] Table 1-1

[0098]

[0099] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0100] Table 1-2

[0101]

[0102] 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.

[0103] 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.

[0104] 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 ±0.02mm, indicating that the optical lens 100 is capable of correcting axial aberration well.

[0105] Figure 4 A vertical chromatic aberration curve 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 a range of -1 μm to 2 μm, demonstrating that the optical lens 100 is capable of excellently correcting chromatic aberration across all viewing fields.

[0106] Example 2

[0107] 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 object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0108] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0109] Table 2-1

[0110]

[0111] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0112] Table 2-2

[0113]

[0114] 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.

[0115] 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.

[0116] from Figure 7 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0117] from Figure 8 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 perfectly correct the chromatic aberration of each field of view.

[0118] Example 3

[0119] 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 has the following main differences: the object-side surface S9 of the fifth lens L5 is convex; the image-side surface S10 of the fifth lens L5 is concave; the object-side surface S11 of the sixth lens L6 is concave; 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 300 in Example 3 are shown in Table 3-1.

[0121] Table 3-1

[0122]

[0123] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0124] Table 3-2

[0125]

[0126] 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.

[0127] from Figure 10It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within -0.1mm~0.3mm, indicating that the optical lens 300 can correct the astigmatism well.

[0128] 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.

[0129] from Figure 12 As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 300 can perfectly correct the chromatic aberration of each field of view.

[0130] Example 4

[0131] 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 has the following main differences: the object-side surface S7 of the fourth lens L4 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0132] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0133] Table 4-1

[0134]

[0135] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0136] Table 4-2

[0137]

[0138] 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.

[0139] 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.

[0140] from Figure 15 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0141] from Figure 16It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 400 can excellently correct the chromatic aberration of each field of view.

[0142] Example 5

[0143] See also Figure 17 , shown is a schematic structural diagram of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S7 of the fourth lens L4 is concave; the object-side surface S9 of the fifth lens L5 is convex; the image-side surface S10 of the fifth lens L5 is concave; and the object-side surface S11 of the sixth lens L6 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0144] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0145] Table 5-1

[0146]

[0147] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0148] Table 5-2

[0149]

[0150] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 500 are respectively as follows: Figure 18 、 Figure 19 、 Figure 20 shown.

[0151] from Figure 18 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 500 can correct the astigmatism well.

[0152] from Figure 19 It can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 500 can correct the axial aberration well.

[0153] from Figure 20 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 500 can excellently correct the chromatic aberration of each field of view.

[0154] Example 6

[0155] See also Figure 21, shown is a schematic structural diagram of an optical lens 600 provided in Example 6 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S7 of the fourth lens L4 is concave; the image-side surface S8 of the fourth lens L4 is convex; the object-side surface S9 of the fifth lens L5 is convex; and the object-side surface S11 of the sixth lens L6 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0156] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0157] Table 6-1

[0158]

[0159] The surface parameters of the aspheric lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0160] Table 6-2

[0161]

[0162] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 600 are respectively as follows: Figure 22 、 Figure 23 、 Figure 24 shown.

[0163] from Figure 22 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.2 mm, indicating that the optical lens 600 can correct the astigmatism well.

[0164] from Figure 23 It can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 600 can correct the axial aberration well.

[0165] from Figure 24 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens 600 can excellently correct the chromatic aberration of each field of view.

[0166] Please refer to Table 7, 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.

[0167] Table 7

[0168]

[0169] In summary of the above embodiments, the optical lens provided by the present invention has at least the following advantages:

[0170] 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.

[0171] 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.

[0172] 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 positive refractive power, whose object-side surface is concave and whose image-side surface is convex; 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 negative optical power; a fifth lens having positive refractive power; a sixth lens element having negative optical power and a concave image-side surface; The seventh lens element has positive refractive power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis; The combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy the following conditions: <f12 / f37<6.5。 2. The optical lens according to claim 1, wherein: 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 meet the following requirements: 1.1 <TTL / IH<1.3。 3. The optical lens according to claim 1, wherein: 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 the following conditions: 3.5<(TTL×tan(FOV / 2)) / (IH / 2)<3.

8.

4. The optical lens according to claim 1, wherein: The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 <f3 / f<0.9。 5. The optical lens according to claim 1, wherein: The combined focal length f12 of the first lens and the second lens satisfies the effective focal length f of the optical lens: 5.4 <f12 / f<8.2。 6. The optical lens according to claim 1, wherein: The radius of curvature R1 of the object side of the first lens and the vector height SAGX11 corresponding to the maximum light semi-aperture of the object side end of the first lens meet the following requirements: 2.3 <R1 / SAGX11<3。 7. The optical lens according to claim 1, wherein: The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the distance CT12 between the first lens and the second lens on the optical axis, and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 1.4<(CT1+CT2+CT3) / (CT12+CT23)<1.

7.

8. The optical lens according to claim 1, wherein: A curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: 4.8<(R1+R2) / (R1-R2)<6.

2.

9. The optical lens according to claim 1, wherein: A curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 5.5<(R3+R4) / (R3-R4)<6.

2.

10. 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: -5.7 <f1 / (R1+R2)<-4。

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