Optical lens

Abstract

The present invention provides an optical lens, which includes, along the optical axis from the object side to the imaging surface, the following sequence: a first lens having positive optical power, whose object side surface is convex and whose image side surface is concave; a second lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a third lens having negative optical power; a fourth lens having negative optical power; a fifth lens having negative optical power, whose image side surface is concave near the optical axis; a sixth lens having positive optical power, whose object side surface is convex near the optical axis and whose image side surface is convex; and a seventh lens having negative optical power, whose object side surface is concave and whose image side surface is concave near the optical axis. The optical lens provided by the present invention, through a specific surface shape setting and reasonable optical power distribution, can reasonably correct the overall aberration of the optical lens, so that the optical lens has one or more advantages such as large image height, large aperture, miniaturization, and high imaging quality.

Description

Technical Field

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

[0002] With the development of science and technology, portable electronic products with a camera function are increasingly favored by users, and users' requirements for portable electronic products are getting higher and higher. The total length of the optical lens in existing portable electronic products is relatively large, and the image height is relatively small, which limits the users' requirements for the thin and light of portable electronic products and clear imaging with a large bottom and high pixels, becoming a problem in the field of optical lens design.

[0003] Therefore, how to meet the characteristics of being thin and light, having a large image height, and at the same time taking into account clear imaging is one of the urgent problems to be solved in the field of optical lenses. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide an optical lens, which has one or more advantages such as a large image height, a large aperture, miniaturization, and high imaging quality.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An optical lens, comprising a total of seven lenses, which are sequentially arranged from the object side to the imaging surface along the optical axis:

[0007] A first lens with a positive optical power, the object side thereof is convex, and the image side thereof is concave;

[0008] A second lens with a negative optical power, the object side thereof is convex, and the image side thereof is concave;

[0009] A third lens with a negative optical power;

[0010] A fourth lens with a negative optical power;

[0011] A fifth lens with a negative optical power, the image side thereof is concave near the optical axis;

[0012] A sixth lens with a positive optical power, the object side thereof is convex near the optical axis, and the image side thereof is convex;

[0013] A seventh lens with a negative optical power, the object side thereof is concave, and the image side thereof is concave near the optical axis;

[0014] Wherein, the total optical length TTL of the optical lens satisfies: 6.5 mm < TTL < 6.9 mm; the total optical length TTL of the optical lens, 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: 12.8 mm < TTL×(IH / f) < 13.5 mm.

[0015] Further preferably, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens meet the following requirements: 4.1 mm <TTL / Fno<4.5mm。

[0016] Further preferably, the sag SAGX71 corresponding to the maximum clear semi-aperture at the object side end of the seventh lens, the sag SAGX62 corresponding to the maximum clear semi-aperture at the image side end of the sixth lens, and the distance AT67 between the sixth lens and the seventh lens on the optical axis satisfy: -0.8<(SAGX71-SAGX62) / AT67<-0.3.

[0017] 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: 1.2<(TTL×tan(FOV / 2)) / (IH / 2)<1.3.

[0018] Further preferably, the semi-aperture CSD11 of the object side end of the first lens, the semi-aperture CSD61 of the object side end of the sixth lens and the semi-aperture CSD72 of the image side end of the seventh lens satisfy the following conditions: 0.22 <CSD11 / (CSD61+CSD72)<0.23。

[0019] Further preferably, 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 center thickness CT4 of the fourth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 0.35 mm < (CT2 + CT3 + CT4 + CT5) / 4 < 0.55 mm.

[0020] Further preferably, the focal length f6 of the sixth lens, the focal length f7 of the seventh lens, and the focal length f5 of the fifth lens satisfy the following relationship: 0.02<(f6+f7) / f5<0.07.

[0021] Further preferably, the center thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 1.8 <CT6 / ET6<3.5。

[0022] Further preferably, a sum ∑CT of the center thicknesses of the first lens to the seventh lens on the optical axis and a sum ∑AT of the spacing distances between any two adjacent lenses from the first lens to the seventh lens on the optical axis satisfy the following relationship: 2<∑CT / ∑AT<3.

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -30 < f4 / f < -9; the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.1 < f5 / f < -1.3.

[0024] Compared with the prior art, the optical lens provided by the present invention has a small volume through specific surface shape settings and reasonable optical power distribution; it can also achieve a large image height of the lens, can be paired with a large target surface chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image; it enables the lens to have a large aperture, and high-definition imaging can be achieved even in a dim environment; it can also reasonably correct the overall aberration of the optical lens, making the optical lens have high pixels and improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0026] Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 2 It is an astigmatism curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 It is a f~tan(θ) distortion curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 It is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 [[ID=燕]]It is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 6 It is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 7 It is an astigmatism curve diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 8 It is a f~tan(θ) distortion curve diagram of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 9 It is an axial aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 10 It is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0037] Figure 12 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0038] Figure 13 2 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 3 of the present invention.

[0039] Figure 14 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0040] Figure 15 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0041] Figure 16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0042] Figure 17 4 is an astigmatism curve diagram of the optical lens in Example 4 of the present invention.

[0043] Figure 18 4 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 4 of the present invention.

[0044] Figure 19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0045] Figure 20 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0046] Figure 21 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0047] Figure 22 4 is an astigmatism curve diagram of the optical lens in Example 5 of the present invention.

[0048] Figure 23 4 is a graph showing the f-tan(θ) distortion curve of the optical lens in Example 5 of the present invention.

[0049] Figure 24 4 is an axial aberration curve diagram of the optical lens in Example 5 of the present invention.

[0050] Figure 25 Graph showing vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0051] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in conjunction with the embodiments.

[0059] The optical lens provided by the embodiment of the present invention has a total of seven lenses, which are, in order from the object side to the imaging surface along the optical axis, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0060] In some embodiments, the first lens may have a positive optical power, its object side is a convex surface, and its image side is a concave surface. The second lens may have a negative optical power, its object side is a convex surface, and its image side is a concave surface. The third lens may have a negative optical power, its object side may be a concave surface or a convex surface, and its image side may be a concave surface or a convex surface. The fourth lens may have a negative optical power, its object side may be a concave surface or a convex surface, and its image side may be a concave surface or a convex surface. The fifth lens may have a negative optical power, its object side may be a concave surface or a convex surface, and its image side is a concave surface near the optical axis. The sixth lens may have a positive optical power, its object side is a convex surface near the optical axis, and its image side is a convex surface. The seventh lens may have a negative optical power, its object side is a concave surface, and its image side is a concave surface near the optical axis.

[0061] In some embodiments, the optical lens may further include an aperture stop, and the aperture stop may be located between the object side and the first lens. It can be understood that the aperture stop is used to limit the amount of incident light to change the brightness of the image.

[0062] 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.

[0063] In some embodiments, the total optical length TTL of the optical lens satisfies: 6.5mm < TTL < 6.9mm; the total optical length TTL of the optical lens, 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: 12.8mm < TTL × (IH / f) < 13.5mm. Satisfying the above conditional expressions ensures that the optical lens has a smaller total length and a larger image height, and controlling the relationship between the image height and the focal length ensures that the optical lens achieves a balance between small volume and high pixels, making the optical lens have the characteristics of a large bottom high pixel and being thin and light at the same time.

[0064] In some embodiments, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 4.1mm < TTL / Fno < 4.5mm. Satisfying the above conditional expressions, by controlling the relationship between the total length of the optical lens and the aperture value, it is ensured that the optical lens can meet the requirements of large aperture and thin and light 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.

[0065] In some embodiments, the sagittal height SAGX71 corresponding to the maximum clear aperture semi-diameter at the object side end of the seventh lens, the sagittal height SAGX62 corresponding to the maximum clear aperture semi-diameter at the image side end of the sixth lens, and the distance AT67 between the sixth lens and the seventh lens on the optical axis satisfy: -0.8 < (SAGX71 - SAGX62) / AT67 < -0.3. Satisfying the above conditional formula can reasonably configure the sagittal heights of the image side surface of the sixth lens and the object side surface of the seventh lens and the air gap, which is beneficial to the effective deflection of light rays between the sixth lens and the seventh lens, thereby being beneficial to reducing the chief ray angle on the imaging surface of the optical lens, and further effectively correcting the aberration of the peripheral field of view and improving the imaging quality.

[0066] 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: 1.2 < (TTL × tan(FOV / 2)) / (IH / 2) < 1.3. Satisfying 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 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 imaging reduction degree of the lens can be improved.

[0067] In some embodiments, the clear aperture semi-diameter CSD11 at the object side end of the first lens, the clear aperture semi-diameter CSD61 at the object side end of the sixth lens, and the clear aperture semi-diameter CSD72 at the image side end of the seventh lens satisfy: 0.22 < CSD11 / (CSD61 + CSD72) < 0.23. Satisfying the above conditional formula, by restricting the ratio of the clear aperture semi-diameter at the object side end of the first lens to the sum of the clear aperture semi-diameters at the object side end of the sixth lens and the image side end of the seventh lens, reasonably controlling the sizes of the front and rear ends of the optical lens perpendicular to the optical axis, it can ensure that the entire optical lens has a small size and ensure that the optical lens meets the miniaturization requirements.

[0068] In some embodiments, 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 central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.35mm < (CT2 + CT3 + CT4 + CT5) / 4 < 0.55mm. Satisfying the above conditional formula, by setting the central thicknesses of the second lens, the third lens, the fourth lens, and the fifth lens within a reasonable range, it not only ensures that each lens meets the processing performance but also ensures the ultra-thin characteristics of each lens, and further enables the optical lens to meet the ultra-thin design requirements.

[0069] In some embodiments, the focal length f6 of the sixth lens, the focal length f7 of the seventh lens, and the focal length f5 of the fifth lens satisfy: 0.02 < (f6 + f7) / f5 < 0.07. Satisfying the above conditional formula makes the deflection of light rays in each field of view on the surfaces of the fifth lens, the sixth lens, and the seventh lens smoother, effectively reducing total internal reflection of light rays and ghost images on the lens surface, and better complementarily eliminating positive and negative spherical aberrations, chromatic aberration of magnification, etc. at different fields of view, thereby improving imaging quality.

[0070] In some embodiments, the central thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 1.8 < CT6 / ET6 < 3.5. Satisfying the above conditional formula can reasonably control the ratio of the central thickness to the edge thickness of the sixth lens, thereby controlling the overall thickness of the sixth lens and avoiding a situation where the ratio difference between the central thickness and the edge thickness is too large, which is not conducive to processing and assembly.

[0071] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis respectively and the sum ∑AT of the spacing distances between any two adjacent lenses of the first lens to the seventh lens on the optical axis satisfy: 2 < ∑CT / ∑AT < 3. Satisfying the above conditional formula can effectively reduce the size of the optical lens, avoid the optical lens from being too large in volume, and at the same time reduce the assembly difficulty of the lenses, enabling the optical lens to achieve a high space utilization rate.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -30 < f4 / f < -9; the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.1 < f5 / f < -1.3. Satisfying the above conditional formula, by setting the fourth lens and the fifth lens with negative optical powers, it can be ensured that when large-angle light rays are incident on the optical lens, they can spread smoothly, improving the brightness of the image plane in the large-angle field of view, and at the same time being beneficial to correcting the aberration generated by the refraction of light rays through the front lenses and improving the resolution of the optical lens.

[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.4 < f6 / f < 0.6. Satisfying the above conditional formula, the sixth lens provides positive optical power for the optical lens. As the penultimate lens of the optical lens, it can converge the light beam emitted by the front lenses, smoothly transmit the light beam to the seventh lens, and avoid a large field curvature in the edge field of view.

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.7 < f7 / f < -0.5. Satisfying the above conditional formula is beneficial for the seventh lens to cooperate with the foregoing lenses to shorten the back focal length and achieve miniaturized design of the optical system.

[0075] 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: 0.6 < f1 / (R1 + R2) < 0.8. 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 to reducing the bending degree of light at the image side surface of the first lens and decreasing the angle of light incident on the lens, so as to balance the high-order aberrations of the optical lens, and further ensure that the optical lens has excellent imaging quality.

[0076] 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: 0.4 < CSD11 / CSD71 < 0.45. 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.

[0077] 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: 2.9 < IH / EPD < 3.2. By satisfying the above conditional formula, an optical lens with a large image plane can have a larger entrance pupil diameter and a higher light transmission amount, and further improve the imaging effect when the optical lens works in a dark environment.

[0078] In some embodiments, the overall 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: 1.6 < TTL / ∑CT < 1.8. By satisfying the above conditional formula, reasonably configuring the overall 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 overall optical length of the optical lens and meet the requirements of miniaturization and lightweight design.

[0079] In some embodiments, the optical lens satisfies the conditional formula: 5mm < f < 5.5mm, 1.5 < Fno < 1.65, 10mm < IH < 10.6mm; where f represents the effective focal length of the optical lens, IH represents the true image height corresponding to the maximum field angle of the optical lens, and Fno represents the aperture value of the optical 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 large aperture, large image height, and large-bottom high pixel characteristics.

[0080] 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.

[0081] 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.

[0082] 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:

[0083] ;

[0084] 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.

[0085] 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.

[0086] Example 1

[0087] 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, an aperture ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0088] The first lens L1 has positive refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0089] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0090] The third lens L3 has negative refractive power, its object-side surface S5 is convex at the near optical axis, and its image-side surface S6 is concave at the near optical axis;

[0091] The fourth lens L4 has negative refractive power, its object-side surface S7 is convex at the near optical axis, and its image-side surface S8 is concave at the near optical axis;

[0092] The fifth lens L5 has negative refractive power, its object-side surface S9 is convex at the near optical axis, and its image-side surface S10 is concave at the near optical axis;

[0093] 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;

[0094] The seventh lens L7 has negative refractive power, its object-side surface S13 is concave, and its image-side surface S14 is concave near the optical axis.

[0095] The object-side surface S15 and the image-side surface S16 of the filter G1 are both flat surfaces;

[0096] The imaging surface S17 is a plane.

[0097] 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.

[0098] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0099] Table 1-1

[0100]

[0101] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0102] Table 1-2

[0103]

[0104] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0105] 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 -0.05mm to 0.1mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0106] Figure 3 The f-tan(θ) distortion curve for Example 1 is shown, showing the f-tan(θ) distortion at different image heights on the imaging plane. The horizontal axis represents the f-tan(θ) distortion value (unit: %), and the vertical axis represents the field of view angle (unit: °). As can be seen from the graph, the f-tan(θ) distortion of the optical lens 100 is controlled within 0-2%, indicating that the distortion of the optical lens 100 is well corrected.

[0107] Figure 4 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 -0.05mm~0.03mm, indicating that the optical lens 100 is able to correct the axial aberration well.

[0108] Figure 5 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 the longest and shortest wavelengths is controlled within ±2 μm, demonstrating that the optical lens 100 is capable of excellently correcting chromatic aberration across all viewing fields.

[0109] Example 2

[0110] See also Figure 6 , 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 S5 of the third lens L3 is a concave surface; the image-side surface S6 of the third lens L3 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0111] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0112] Table 2-1

[0113]

[0114] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0115] Table 2-2

[0116]

[0117] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 200 are shown as follows: Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 shown.

[0118] from Figure 7 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within -0.1mm~0.15mm, indicating that the optical lens 200 can correct the astigmatism well.

[0119] from Figure 8 It can be seen from the figure that the f~tan(θ) distortion of the optical lens 100 is controlled within 0~2%, indicating that the distortion of the optical lens 200 is well corrected.

[0120] from Figure 9 It can be seen from the figure that the offset of the axial aberration is controlled within -0.05mm~0.03mm, which shows that the optical lens 200 can correct the axial aberration well.

[0121] from Figure 10 As can be seen from the figure, the vertical axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 200 can excellently correct the chromatic aberration of each field of view.

[0122] Example 3

[0123] See also Figure 11 , shown is a schematic structural diagram of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main differences between this embodiment and Example 1 are: the object-side surface S5 of the third lens L3 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0124] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are shown as follows: Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 shown.

[0131] from Figure 12 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.

[0132] from Figure 13 It can be seen from the figure that the f~tan(θ) distortion of the optical lens 300 is controlled within 0~2%, indicating that the distortion of the optical lens 300 is well corrected.

[0133] from Figure 14 It can be seen that the offset of the axial aberration is controlled within -0.06mm~0.04mm, indicating that the optical lens 300 can correct the axial aberration well.

[0134] from Figure 15 It can be seen that the vertical axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2μm~4μm, indicating that the optical lens 300 can excellently correct the chromatic aberration of each field of view.

[0135] Example 4

[0136] See also Figure 16 , 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 S5 of the third lens L3 is a concave surface; the object-side surface S7 of the fourth lens L4 is a concave surface; 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.

[0137] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0138] Table 4-1

[0139]

[0140] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0141] Table 4-2

[0142]

[0143] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 400 are shown as follows: Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 shown.

[0144] from Figure 17 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within -0.15mm~0.1mm, indicating that the optical lens 400 can correct the astigmatism well.

[0145] from Figure 18 It can be seen from the figure that the f~tan(θ) distortion of the optical lens 400 is controlled within 0~2.5%, indicating that the distortion of the optical lens 400 is well corrected.

[0146] from Figure 19 It can be seen that the offset of the axial aberration is controlled within ±0.06 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0147] from Figure 20 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3μm~5μm, indicating that the optical lens 400 can excellently correct the chromatic aberration of each field of view.

[0148] Example 5

[0149] See also Figure 21 , 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 S5 of the third lens L3 is a concave surface; the object-side surface S7 of the fourth lens L4 is a concave surface; the image-side surface S8 of the fourth lens L4 is a convex surface; and the object-side surface S9 of the fifth lens L5 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0150] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0151] Table 5-1

[0152]

[0153] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0154] Table 5-2

[0155]

[0156] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 500 are shown as follows: Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 shown.

[0157] 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 ±0.1 mm, indicating that the optical lens 500 can correct the astigmatism well.

[0158] from Figure 23 It can be seen from the figure that the f~tan(θ) distortion of the optical lens 500 is controlled within -0.5%~2%, indicating that the distortion of the optical lens 500 is well corrected.

[0159] from Figure 24 It can be seen that the offset of the axial aberration is controlled within -0.05mm~0.08mm, indicating that the optical lens 500 can correct the axial aberration well.

[0160] from Figure 25 It can be seen that the vertical axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2.5μm, indicating that the optical lens 500 can excellently correct the chromatic aberration of each field of view.

[0161] Please refer to Table 6, 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 half field of view angle, maximum field of view FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0162] Table 6

[0163]

[0164] In summary of the above embodiments, the optical lens provided by the present invention has at least the following advantages:

[0165] 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.

[0166] 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.

[0167] 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 sequentially includes, from the object side to the imaging surface along the optical axis: A first lens with positive optical power, whose object side surface is convex and whose image side surface is concave; A second lens with negative optical power, whose object side surface is convex and whose image side surface is concave; A third lens with negative optical power; A fourth lens with negative optical power; A fifth lens with negative optical power, whose image side surface is concave near the optical axis; A sixth lens with positive optical power, whose object side surface is convex near the optical axis and whose image side surface is convex; A seventh lens with negative optical power, whose object side surface is concave and whose image side surface is concave near the optical axis; Wherein, the total optical length TTL of the optical lens satisfies: 6.5mm < TTL < 6.9mm; The total optical length TTL of the optical lens, 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: 12.8mm < TTL×(IH / f) < 13.5mm.

2. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 4.1mm < TTL / Fno < 4.5mm.

3. The optical lens according to claim 1, wherein: The sagitta SAGX71 corresponding to the maximum clear aperture semi-diameter at the object side end of the seventh lens, the sagitta SAGX62 corresponding to the maximum clear aperture semi-diameter at the image side end of the sixth lens and the spacing AT67 between the sixth lens and the seventh lens on the optical axis satisfy: -0.8 < (SAGX71 - SAGX62) / AT67 < -0.

3.

4. 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: 1.2 < (TTL×tan(FOV / 2)) / (IH / 2) < 1.

3.

5. The optical lens according to claim 1, wherein: The clear aperture semi-diameter CSD11 at the object side end of the first lens, the clear aperture semi-diameter CSD61 at the object side end of the sixth lens and the clear aperture semi-diameter CSD72 at the image side end of the seventh lens satisfy: 0.22 < CSD11 / (CSD61 + CSD72) < 0.

23.

6. The optical lens according to claim 1, wherein: 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 central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.35mm < (CT2 + CT3 + CT4 + CT5) / 4 < 0.55mm.

7. The optical lens according to claim 1, wherein: The focal length f6 of the sixth lens, the focal length f7 of the seventh lens and the focal length f5 of the fifth lens satisfy: 0.02 < (f6 + f7) / f5 < 0.

07.

8. The optical lens according to claim 1, wherein: The central thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 1.8 < CT6 / ET6 < 3.

5.

9. The optical lens according to claim 1, wherein: The sum ∑CT of the central thicknesses of the first lens to the seventh lens respectively on the optical axis and the sum ∑AT of the spacing distances between any two adjacent lenses of the first lens to the seventh lens on the optical axis satisfy: 2 < ∑CT / ∑AT < 3.

10. 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: -30 < f4 / f < -9; the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.1 < f5 / f < -1.3.

Images