Optical lens

Abstract

The invention provides an optical lens, which comprises five lenses from an object side to an imaging surface along an optical axis: a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power, the second lens has positive focal power; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; and the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface near the optical axis. According to the optical lens provided by the invention, through specific surface shape setting and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of short total length, low distortion, high pixel, no space ring and the like.

Description

Technical Field

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

[0002] With the rapid development of mobile communications and imaging technology, portable mobile devices such as learning machines, mobile phones, tablets, and phone watches have put forward higher requirements for the miniaturization and high pixel performance of cameras. At the same time, traditional camera designs usually include a spacer structure, which limits the thin and light design space of the product and also increases the complexity and cost investment in the production and assembly process. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide an optical lens having the advantages of short total length and no spacer ring.

[0004] The technical solution adopted by the present invention is: An optical lens, comprising five lenses, which include: The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave; a second lens having positive optical power; The third lens has positive power, its object side surface is concave and its image side surface is convex; a fourth lens having positive refractive power, whose object-side surface is concave and whose image-side surface is convex; A fifth lens element with negative optical power, whose object side surface is concave and whose image side surface is concave near the optical axis; Among them, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: ET12<0.15mm; ET23<0.15mm; ET34<0.15mm; ET45<0.15mm.

[0005] Further preferably, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: 0.1 mm <ET12<0.15mm;0.05mm<ET23<0.1mm;0.04mm<ET34<0.06mm;0.05mm<ET45<0.1mm。

[0006] More preferably, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5 < CT2 / CT3 < 0.65.

[0007] More preferably, the effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 1 < TTL / f < 1.5; 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: 0.4 < TTL / IH < 0.8; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.1.

[0008] More preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 20 < f2 / f < 35; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -3 < R3 / R4 < 6.

[0009] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 < f5 / f < -0.4; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -0.3 < (R9 + R10) / (R9 - R10) < -0.2.

[0010] More preferably, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis respectively satisfy: 0.55 < ∑CT / TTL < 0.65.

[0011] More preferably, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM52 of the image side surface of the fifth lens satisfy: 0.3 < DM11 / DM52 < 0.35.

[0012] More preferably, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: 25 < f2 / f3 < 35; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0 < f3 / f4 < 0.5.

[0013] More preferably, the distance d23 between the second lens and the third lens on the optical axis and the distance d34 between the third lens and the fourth lens on the optical axis and the overall optical length TTL of the optical lens satisfy: 0 < (d23 + d34) / TTL < 0.1.

[0014] Compared with the prior art, the optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens through a specific surface shape setting and reasonable optical focal length distribution, so that the lens has one or more advantages such as short total length, low distortion, high pixels, and no spacer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0016] Figure 2 Graph showing the astigmatism of the optical lens in Example 1 of the present invention.

[0017] Figure 3 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 1 of the present invention.

[0018] Figure 4 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0019] Figure 5 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0020] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0021] Figure 7 Graph showing the astigmatism of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 2 of the present invention.

[0023] Fig. 9 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0024] Fig.10 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0025] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0026] Fig.12 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0027] Fig.13 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 3 of the present invention.

[0028] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0029] Fig.15 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0030] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0031] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the 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.

[0032] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0033] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0034] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0035] 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 exclude 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 listed 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.

[0036] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0038] The optical lens provided by the embodiment of the present invention comprises five lenses in total, which are a first lens, a second lens, a third lens, a fourth lens and a fifth lens in order from the object side to the imaging surface along the optical axis.

[0039] In some embodiments, the first lens may have positive optical power, its object side surface is convex, and its image side surface is concave. The second lens may have positive optical power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The third lens may have positive optical power, its object side surface is concave, and its image side surface is convex. The fourth lens may have positive optical power, its object side surface is concave, and its image side surface is convex. The fifth lens may have negative optical power, its object side surface is concave, and its image side surface is concave at the near optical axis.

[0040] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the object side and the first lens. It is understood that the aperture is used to limit the amount of incoming light to change the brightness of the image.

[0041] In some embodiments, the optical lens may further include a filter, which is disposed between the fifth lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0042] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: ET12 < 0.15 mm; ET23 < 0.15 mm; ET34 < 0.15 mm; ET45 < 0.15 mm. Meeting the above conditions, the edge gaps of the lenses are all less than 0.15 mm, enabling a spacerless structure, making the camera module more compact, and conforming to the development trend of increasingly miniaturized mobile devices.

[0043] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: 0.1 mm < ET12 < 0.15 mm; 0.05 mm < ET23 < 0.1 mm; 0.04 mm < ET34 < 0.06 mm; 0.05 mm < ET45 < 0.1 mm. Meeting the above conditions, while making the camera module more compact, it also facilitates the production and assembly of the lenses.

[0044] In some embodiments, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5 < CT2 / CT3 < 0.65. Meeting the above conditions, by reasonably configuring the central thickness CT2 of the second lens and the central thickness CT3 of the third lens, a reasonable layout of the second lens and the third lens of the imaging lens can be achieved, thereby realizing the compression of the lateral size of the lens and ensuring the ultra-thin characteristics and miniaturization of the imaging lens.

[0045] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1 < TTL / f < 1.5. Meeting the above conditions, the length of the lens can be effectively limited, which is beneficial to the miniaturization of the optical lens.

[0046] In some embodiments, the total 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: 0.4 < TTL / IH < 0.8. Meeting the above conditions, the miniaturization of the lens can be better achieved. At the same time, when ensuring the same total length of the lens, it has a larger image plane and can match a larger-sized imaging chip to achieve high-definition imaging.

[0047] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 20 < f2 / f < 35. Meeting the above conditions, by reasonably setting the focal length of the second lens, it is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0048] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -3 < R3 / R4 < 6. Meeting the above conditions, by reasonably setting the surface shape of the second lens, it is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0049] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 < f5 / f < -0.4. Meeting the above conditions, by setting the fifth lens to have a large negative optical power, the incident light can be diverged to a large extent, causing the peripheral light and the central light to turn upwards, reaching a higher imaging position, better realizing the large target surface imaging of the lens, and improving the imaging quality.

[0050] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.3 < (R9 + R10) / (R9 - R10) < -0.2. Meeting the above conditions, the surface shape of the fifth lens can be controlled, reducing the incident angle of light on the fifth lens, and at the same time facilitating the processing of the lens.

[0051] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first to fifth lenses along the optical axis respectively satisfy: 0.55 < ∑CT / TTL < 0.65. Meeting the above conditions, the total length of the optical lens can be effectively compressed, and at the same time it is beneficial to the structural design and production process of the optical lens.

[0052] In some embodiments, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM52 of the image side surface of the fifth lens satisfy: 0.3 < DM11 / DM52 < 0.35. Meeting the above conditions, by reasonably setting the ratio of the apertures of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance of miniaturization and high pixels.

[0053] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.1. Meeting the above conditions, by reasonably setting the focal length ratio of the first lens and the second lens, the incident light can be quickly converged after passing through the first lens, thereby shortening the system length and being beneficial to reducing the lens size; while the second lens can smoothly transition the incident light, facilitating the correction of astigmatism and field curvature.

[0054] In some embodiments, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: 25 < f2 / f3 < 35; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0 < f3 / f4 < 0.5. By satisfying the above conditions and reasonably setting the focal length ratios of the second, third, and fourth lenses, the system length can be shortened, and the aberration and distortion of the edge field of view can be reduced, so that the lens has less distortion and can provide a high-definition imaging effect.

[0055] In some embodiments, the spacing distance d23 between the second lens and the third lens on the optical axis, the spacing distance d34 between the third lens and the fourth lens on the optical axis, and the total optical length TTL of the optical lens satisfy: 0 < (d23 + d34) / TTL < 0.1. By satisfying the above conditions, it is ensured that the spacing between the second, third, and fourth lenses is not too large, thereby controlling the lens length. On the basis of meeting the miniaturization of the optical lens, the energy level of the ghost image reflected between the lenses is reduced, realizing miniaturization and weak ghost images.

[0056] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2 < IH / f < 2.1. By satisfying the above conditions, a larger field of view angle and imaging range can be achieved on the premise of a short focal length. While ensuring clear imaging, the large image plane characteristic can be realized, thereby improving the imaging quality of the optical system.

[0057] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < f3 / f < 1.2; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.5 < f4 / f < 4. By satisfying the above conditions, the third lens and the fourth lens further converge the incident light rays at the front end, which is beneficial to correcting the aberration and distortion of the edge field of view brought by the front lens group, so that the lens has less distortion and can provide a high-definition imaging effect.

[0058] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -2.4 < f1 / f5 < -2. By satisfying the above conditions and reasonably setting the focal length ratio of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, which can better meet the balance between miniaturization and high pixels.

[0059] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the aperture value Fno of the optical lens satisfy: 2.2 mm < IH / Fno < 2.9 mm. By satisfying the above conditions, the lens can better achieve the balance between large target surface imaging and large aperture performance, the pixel distribution can be sparser (i.e., the pixel point size is larger), the noise can be reduced in a darker environment, the dynamic range will be wider, and more details can be retained in the dark part, thereby improving the picture quality.

[0060] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.2 < IH / EPD < 4.9. Meeting the above range enables the optical lens to satisfy the image plane height while also ensuring sufficient image plane brightness in the edge field of view, preventing vignetting, and thus improving the imaging quality.

[0061] In some embodiments, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.96 < (2f × tan(FOV / 2)) / IH < 1. Meeting the above conditions can make the lens have a small distortion value and provide a high-definition imaging effect.

[0062] In some embodiments, the combined focal length f13 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy: 0.55 < f13 / f < 0.65. Meeting the above conditions can effectively control the combined focal length of the first lens to the third lens, making the refractive power intensity at the object side end of the optical imaging system sufficient, facilitating the effective convergence of large-angle light, being beneficial to achieving wide-angleization of the optical imaging system, and improving the imaging quality of the optical imaging system.

[0063] In some embodiments, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -0.65 < f45 / f < -0.5. Meeting the above conditions, by reasonably controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the optical lens, it is beneficial to control the angle of the incident light beam exiting the optical lens, thereby reducing the aberration generated by the optical lens.

[0064] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, the edge spacing distance ET45 between the fourth lens and the fifth lens, and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis satisfy: 0.1 < (ET12 + ET23 + ET34 + ET45) / ∑CT < 0.2. Meeting the above conditions can make the optical lens more compact.

[0065] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, the edge spacing distance ET45 between the fourth lens and the fifth lens, and the sum ∑ET of the edge thicknesses of the first lens to the fifth lens satisfy: 0.18 < (ET12 + ET23 + ET34 + ET45) / ∑ET < 0.22. By satisfying the above conditions, the edge spacing of the lens can be further defined, making the optical lens more compact.

[0066] In some embodiments, the optical lens satisfies the conditional formula: 2.5mm < f < 3mm, 3.2mm < TTL < 3.7mm, 88° < FOV < 93°, where f represents the effective focal length of the optical lens, TTL represents the total optical length of the optical lens, and FOV represents the maximum field of view angle of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least a smaller total optical length, features of short focal length and wide angle. The depth of field of a short focal length lens is relatively deep, and both the front and back of the subject can remain relatively clear, achieving characteristics such as high-definition imaging.

[0067] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. Additionally, when the lens material is glass, due to the low dispersion characteristic of glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance between the miniaturization of the lens and high image quality.

[0068] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens of the present invention can all adopt aspherical lenses.

[0069] In each embodiment of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations: ; where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the conic coefficient, and B, C, D, E, F, G, H are the conic coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order respectively.

[0070] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0071] Example 1 See also Figure 1 , shown is a schematic diagram of the structure of the optical lens 100 provided in Example 1 of the present invention, and the optical lens 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 and a filter G1.

[0072] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave; The second lens L2 has positive refractive power, an object-side surface S3 thereof is convex at the near optical axis, and an image-side surface S4 thereof is concave at the near optical axis; The third lens L3 has positive refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex; The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex; The fifth lens L5 has negative refractive power, its object side surface S9 is concave, and its image side surface S10 is concave at the near optical axis; The object side surface S11 and the image side surface S12 of the filter G1 are both planes; The imaging surface S13 is a plane.

[0073] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all plastic aspherical lenses.

[0074] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0075] Table 1-1 The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0076] Table 1-2 In this embodiment, the astigmatism curve, F-Tan (Theta) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0077] Figure 2 The astigmatism curve of Example 1 is shown, which represents 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 half field angle (unit: °). 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 100 can correct the astigmatism well.

[0078] Figure 3 The F-Tan (Theta) distortion curve of Example 1 is shown, which represents the F-Tan (Theta) distortion at different image heights on the imaging surface, the horizontal axis represents the F-Tan (Theta) distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tan (Theta) distortion of the optical lens 100 is controlled within ±1%, indicating that the distortion of the optical lens 100 is well corrected.

[0079] Figure 4 The axial aberration curve of the present embodiment 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -0.04mm~0.02mm, indicating that the optical lens 100 can better correct the axial aberration.

[0080] Figure 5 The vertical chromatic aberration curve of Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, indicating that the optical lens 100 can extremely well correct the chromatic aberration of each field of view.

[0081] Example 2 See also Figure 6 , shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main differences of this embodiment are: the image side surface S4 of the second lens L2 is convex at the near optical axis; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0082] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0083] Table 2-1 The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0084] Table 2-2 In this embodiment, the astigmatism curve, F-Tan (Theta) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0085] from Figure 7 It can be seen 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.

[0086] from Figure 8 It can be seen that the F-Tan (Theta) distortion of the optical lens 200 is controlled within ±1%, indicating that the distortion of the optical lens 200 is well corrected.

[0087] from Fig. 9 It can be seen that the offset of the axial aberration is controlled within -0.03mm~0.02mm, which means that the optical lens 200 can correct the axial aberration well.

[0088] from Fig.10 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 200 can extremely well correct the chromatic aberration of each field of view.

[0089] Example 3 See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main differences of this embodiment are: the object side surface S3 of the second lens L2 is a concave surface; the image side surface S4 of the second lens L2 is a convex surface at the near optical axis; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0090] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0091] Table 3-1 The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0092] Table 3-2 In this embodiment, the astigmatism curve, F-Tan (Theta) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0093] from Fig.12 It can be seen 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.

[0094] from Fig.13 It can be seen that the F-Tan (Theta) distortion of the optical lens 300 is controlled within ±1.5%, indicating that the distortion of the optical lens 300 is well corrected.

[0095] from Fig.14 It can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0096] from Fig.15 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 300 can extremely well correct the chromatic aberration of each field of view.

[0097] Please refer to Table 4, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray incident angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0098] Table 4 In summary, the optical lens provided by the present invention has at least the following advantages: (1) Through specific surface shape settings and reasonable optical focal length distribution, the length of the optical lens can be effectively limited, making the lens have a short total length. At the same time, the edge gap of the lens is less than 0.15mm, which can achieve a spacer-free structure, making the camera module more compact, which is in line with the development of increasingly miniaturized mobile devices.

[0099] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens. The overall lens aberration is small, and it has the characteristics of small distortion and high pixel, thereby improving the imaging quality of the optical lens.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0101] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, comprising five 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 is convex and whose image side is concave; A second lens with positive optical power; A third lens with positive optical power, whose object side is concave and whose image side is convex; A fourth lens with positive optical power, whose object side is concave and whose image side is convex; A fifth lens with negative optical power, whose object side is concave and whose image side is concave near the optical axis; Wherein, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: ET12 < 0.15mm; ET23 < 0.15mm; ET34 < 0.15mm; ET45 < 0.15mm.

2. The optical lens according to claim 1, characterized in that: The edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: 0.1mm < ET12 < 0.15mm; 0.05mm < ET23 < 0.1mm; 0.04mm < ET34 < 0.06mm; 0.05mm < ET45 < 0.1mm.

3. The optical lens according to claim 1, characterized in that: The central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5 < CT2 / CT3 < 0.

65.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 1 < TTL / f < 1.5; 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: 0.4 < TTL / IH < 0.

8.

5. The optical lens according to claim 1, characterized in that: The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 20 < f2 / f < 35; The curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: -3 < R3 / R4 < 6.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 < f5 / f < -0.4; The curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -0.3 < (R9 + R10) / (R9 - R10) < -0.

2.

7. The optical lens according to claim 1, characterized in that: The overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens respectively along the optical axis satisfy: 0.55 < ∑CT / TTL < 0.

65.

8. The optical lens according to claim 1, characterized in that: The clear aperture semi-diameter DM11 of the object side of the first lens and the clear aperture semi-diameter DM52 of the image side of the fifth lens satisfy: 0.3 < DM11 / DM52 < 0.

35.

9. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.1; the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: 25 < f2 / f3 < 35; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0 < f3 / f4 < 0.

5.

10. The optical lens according to claim 1, characterized in that: The distance d23 between the second lens and the third lens on the optical axis, the distance d34 between the third lens and the fourth lens on the optical axis, and the overall optical length TTL of the optical lens satisfy: 0 < (d23 + d34) / TTL < 0.1.

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