Optical lens

Abstract

The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with a positive optical power, whose object side is a convex surface; a second lens with a negative optical power, whose object side is a convex surface and whose image side is a concave surface; a third lens with a positive optical power; a fourth lens with a negative optical power, whose object side is a concave surface and whose image side is a convex surface; a fifth lens with a positive optical power, whose image side is a convex surface; wherein, the effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 0.95 < TTL / f < 1.05; 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: 0.62 < IH / f < 0.7. The optical lens provided by the present invention has a telephoto characteristic and a compact large-aperture structure through specific surface shape settings and reasonable optical power distribution, effectively shortening the overall length of the optical lens and improving the imaging quality of the optical lens.

Description

Technical Field

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

[0002] Currently, with the popularization of portable electronic devices and the popularity of social, video, and live streaming software, people's love for photography is increasing. Camera lenses have become a standard configuration of electronic devices, and even the primary consideration index when consumers purchase electronic devices. In order to improve the imaging quality of distant objects, most flagship mobile phones of mobile phone manufacturers are equipped with a telephoto optical lens, which can clearly magnify the scene when shooting a distant view, and can effectively blur the background to highlight the main body, thereby improving the quality of mobile phone shooting. However, although the common five-element optical lens already has good optical performance, the aperture of the lens is relatively small, generally above 2.4, which cannot meet the design requirements of long focal length and large aperture at the same time, affecting the shooting experience of users. Summary of the Invention

[0003] In view of the above problems, the object of the present invention is to provide an optical lens, which has one or more advantages such as long focal length, large aperture, small total length, and excellent imaging quality.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An optical lens is composed of five lenses, and sequentially includes from the object side to the imaging surface along the optical axis:

[0006] A first lens with positive optical power, the object side surface of which is convex;

[0007] A second lens with negative optical power, the object side surface of which is convex and the image side surface of which is concave;

[0008] A third lens with positive optical power;

[0009] A fourth lens with negative optical power, the object side surface of which is concave and the image side surface of which is convex;

[0010] A fifth lens with positive optical power, the image side surface of which is convex;

[0011] Wherein, the effective focal length f of the optical lens and the optical total length TTL of the optical lens satisfy: 0.95 < TTL / f < 1.05; 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: 0.62 < IH / f < 0.7.

[0012] More preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5 < f1 / f < 0.6; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -1.1 < (R1 - R2) / (R1 + R2) < -0.9.

[0013] More preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -0.9 < f2 / f < -0.5; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.3 < (R3 - R4) / (R3 + R4) < 0.4.

[0014] More preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 3.5 < f3 / f < 4.

[0015] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -4 < f4 / f < -2; the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -0.18 < (R7 - R8) / (R7 + R8) < -0.05.

[0016] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 3.5 < f5 / f < 5; the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -8 < R10 / f < -0.5.

[0017] More preferably, the combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: 0.1 < f12 / f345 < 0.3.

[0018] More preferably, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -0.25 < f2 / f3 < -0.1.

[0019] More preferably, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.9 < f4 / f5 < -0.5.

[0020] More preferably, the central thickness CT1 of the first lens and the central thickness CT5 of the fifth lens satisfy: 2.5 < CT1 / CT5 < 3.5; 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: 1.1 < DM11 / DM52 < 1.4.

[0021] 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 satisfy: 1.45 <TTL / IH<1.55。

[0022] Compared with the prior art, the optical lens provided by the present invention has a telephoto characteristic through a specific surface shape setting and a reasonable distribution of optical power, which can better present larger local details, make the picture more concentrated and compact, and thus meet the local shooting needs; it also has a compact large aperture structure, which effectively shortens the overall length of the optical lens, and allows more light flux to enter the optical lens, so that the system can also image clearly in a dim environment. In addition, the optical lens of the present invention can also reasonably correct the overall aberration of the optical lens and improve the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0025] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0026] Figure 3 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 1 of the present invention.

[0027] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0028] Figure 5 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 7 Graph showing the field curvature of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 8 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 2 of the present invention.

[0032] Fig. 9 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0033] Fig.10 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0034] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0035] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0036] Fig.13 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 3 of the present invention.

[0037] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0038] Fig.15 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0039] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The optical lens provided by the embodiment of the present invention is composed of five lenses, 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.

[0048] In some embodiments, the first lens may have positive power, its object side surface is convex, and its image side surface may be concave or convex. The second lens may have negative power, its object side surface is convex, and its image side surface is concave. The third lens may have positive power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The fourth lens may have negative power, its object side surface is concave, and its image side surface is convex. The fifth lens may have positive power, its object side surface may be concave or convex, and its image side surface is convex.

[0049] 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.

[0050] In some embodiments, the optical lens may further include a filter, which may be 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.

[0051] In some embodiments, the effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 0.95 < TTL / f < 1.05. Satisfying the above range can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens. At the same time, it also has a relatively large focal length to meet the requirements of macro shooting.

[0052] 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: 0.62 < IH / f < 0.7. Satisfying the above range is beneficial to achieving the balance of long focal length and large image plane imaging of the lens.

[0053] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5 < f1 / f < 0.6; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -1.1 < (R1 - R2) / (R1 + R2) < -0.9. Satisfying the above range, by reasonably setting the focal length and surface type of the first lens, the light entering the first lens can be well converged into the optical system, increasing the light flux, better realizing the large aperture performance of the lens, and at the same time being beneficial to reducing the difficulty of aberration correction and ensuring the imaging quality of the optical lens.

[0054] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -0.9 < f2 / f < -0.5; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.3 < (R3 - R4) / (R3 + R4) < 0.4. Satisfying the above range, by reasonably setting the focal length and surface type of the second lens, it is beneficial to avoid excessive light deflection caused by the over-concentration of the optical power of the first lens, reduce the difficulty of aberration correction, and at the same time be beneficial to realizing the large image plane imaging of the lens.

[0055] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 3.5 < f3 / f < 4. Satisfying the above range, by reasonably setting the focal length of the third lens, the light can be effectively converged, the light path direction can be controlled, and the difficulty of aberration correction can be reduced.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -4 < f4 / f < -2; the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -0.18 < (R7 - R8) / (R7 + R8) < -0.05. Satisfying the above range, by reasonably setting the focal length and surface type of the fourth lens, it is beneficial to balance various aberrations of the optical lens and improve the overall imaging quality.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 3.5 < f5 / f < 5; the effective focal length f of the optical lens and the image-side curvature radius R10 of the fifth lens satisfy: -8 < R10 / f < -0.5. Meeting the above ranges is beneficial for adjusting the light focusing position, enhancing the light converging ability of the system, and better achieving the miniaturization of the lens and a large image plane.

[0058] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0.1 < f12 / f345 < 0.3. Meeting the above range, by reasonably setting the refractive power relationship between the front and rear lens groups in the lens, the incident light can be converged to a certain extent, which is beneficial for achieving the long focal length performance and large aperture characteristics of the lens.

[0059] In some embodiments, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -0.25 < f2 / f3 < -0.1. Meeting the above range is beneficial for the smooth transition of light, and at the same time correcting various aberrations of the optical lens and improving the imaging quality of the optical lens.

[0060] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.9 < f4 / f5 < -0.5. Meeting the above range can allow as much light as possible to enter the imaging plane, increasing the area of light entering the imaging plane and better achieving large image plane imaging of the lens.

[0061] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT5 of the fifth lens satisfy: 2.5 < CT1 / CT5 < 3.5. Meeting the above range can avoid the excessive small thickness of the first lens and the fifth lens increasing the assembly difficulty and maintain the good processability of the lens.

[0062] In some embodiments, the object-side clear aperture radius DM11 of the first lens and the image-side clear aperture radius DM52 of the fifth lens satisfy: 1.1 < DM11 / DM52 < 1.4. Meeting the above range, by setting the first lens to have a larger optical aperture, as much light as possible can enter the system, increasing the light flux and being beneficial for achieving the large aperture performance of the lens.

[0063] 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: 1.45 < TTL / IH < 1.55. Meeting the above range is beneficial for achieving large image plane imaging while shortening the overall optical length, realizing the balance between the miniaturization of the optical lens and large image plane imaging, and improving the market competitiveness.

[0064] 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: IH / EPD < 2.2. Meeting the above range is beneficial to achieving the large aperture performance of the lens. When the lens forms an image in a relatively dark environment, it can reduce the noise influence caused by too weak light, enabling the lens to meet the imaging requirements under different light fluxes.

[0065] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.3 < BFL / f < 0.4; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.3 < BFL / TTL < 0.4. Meeting the above range can make the lens have a relatively large back focus, which is beneficial to the assembly of the module, reduces interference, and improves the production yield.

[0066] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 2.5 < CT1 / CT2 < 3.5. The central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 0.9 < CT4 / CT5 < 1.25. Meeting the above range, by reasonably distributing the central thickness of each lens, while meeting the requirements of assembly stability, it can reduce the assembly deformation and assembly difficulty of the lens, and at the same time make the structure of the lens more compact, which is conducive to realizing the miniaturization of the lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 0.9 < f12 / f < 1.1. The effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: 4 < f345 / f < 7. Meeting the above range is beneficial to improving the field curvature of the optical lens, reducing the difficulty of optimizing the aberration of the optical lens, and thus improving the imaging quality of the optical lens.

[0068] In some embodiments, the total optical length TTL of the optical lens and the maximum optical aperture SD1 of the first lens satisfy: 0.45 < SD1 / TTL < 0.55. Meeting the above range is beneficial to reducing the aperture of the lens and better realizing the small volume of the lens.

[0069] In some embodiments, the optical lens satisfies the conditional formula: 10 mm < f < 11.5 mm, 30° < FOV < 40°, 10 mm < TTL < 11.5 mm, 6.5 mm < IH < 8 mm, Fno < 2.2, where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, TTL represents the overall optical length of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, and Fno represents the aperture value of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of long focal length, large aperture, and small overall length.

[0070] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected due to the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance between miniaturization and high image quality of the lens.

[0071] 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 realizing 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, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0072] 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 equation:

[0073] ;

[0074] 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, I, and J are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, sixteenth order, eighteenth order, and twentieth order, respectively.

[0075] 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.

[0076] Example 1

[0077] 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.

[0078] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave at the near optical axis;

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

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

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

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

[0083] The object side surface S11 and the image side surface S12 of the filter G1 are both planes;

[0084] The imaging surface S13 is a plane.

[0085] 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.

[0086] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0087] Table 1-1

[0088]

[0089] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0090] Table 1-2

[0091]

[0092] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and relative illumination curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0093] Figure 2 The field curvature curve of Example 1 is shown, which indicates the degree of curvature of light on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.08 mm, indicating that the optical lens 100 can correct the field curvature well.

[0094] Figure 3 The F-Tanθ distortion curve of Example 1 is shown, which represents the F-Tanθ distortion at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion value (unit: %), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens 100 is controlled within ±0.4%, indicating that the distortion of the optical lens 100 is well corrected.

[0095] Figure 4 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.

[0096] Figure 5 The relative illumination curve of Example 1 is shown, which represents the relative illumination values ​​at different field angles on the imaging plane, with the horizontal axis representing the field angle (unit: °) and the vertical axis representing the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens at the maximum field of view at the edge is still greater than 48%, indicating that the optical lens 100 has a high relative illumination in the entire field of view.

[0097] Example 2

[0098] 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 S2 of the first lens L1 is a convex surface; the object side surface S5 of the third lens L3 is a concave surface at the near optical axis; the image side surface S6 of the third lens L3 is a convex surface at the near optical axis; the object side surface S9 of the fifth lens L5 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0099] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0100] Table 2-1

[0101]

[0102] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0103] Table 2-2

[0104]

[0105] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and relative illumination curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 and Fig.10 shown.

[0106] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.08mm, indicating that the optical lens 200 can correct the field curvature well.

[0107] from Figure 8 It can be seen that the F-Tanθ distortion of the optical lens 200 is controlled within ±0.6%, indicating that the distortion of the optical lens 200 is well corrected.

[0108] from Fig. 9 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 200 can extremely well correct the chromatic aberration of each field of view.

[0109] from Fig.10 It can be seen that the relative illumination value of the optical lens at the edge of the maximum field of view is still greater than 50%, indicating that the optical lens 200 has a very good relative illumination.

[0110] Example 3

[0111] 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 image side surface S2 of the first lens L1 is a convex surface; the object side surface S9 of the fifth lens L5 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0112] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0113] Table 3-1

[0114]

[0115] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0116] Table 3-2

[0117]

[0118] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and relative illumination curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 and Fig.15 shown.

[0119] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the field curvature well.

[0120] from Fig.13 It can be seen that the F-Tanθ distortion of the optical lens 300 is controlled within ±0.8%, indicating that the distortion of the optical lens 300 is well corrected.

[0121] from Fig.14 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.

[0122] from Fig.15 It can be seen that the relative illumination value of the optical lens at the edge of the maximum field of view is still greater than 45%, indicating that the optical lens 300 has a very good relative illumination.

[0123] 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.

[0124] Table 4

[0125]

[0126] In summary, the optical lens provided by the present invention has at least the following advantages:

[0127] (1) Through the specific surface shape setting and reasonable optical focal length distribution, the lens has a telephoto characteristic, which can better present larger local details and make the picture more focused and compact, thus meeting the needs of local shooting; it also has a compact large aperture structure, which effectively shortens the overall length of the optical lens and allows more light flux to enter the optical lens, so that the system can also produce clear images in dim environments.

[0128] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens, so that the optical lens has small distortion and high pixel, thereby improving the imaging quality of the optical lens.

[0129] 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.

[0130] 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, which consists of five lenses, characterized in that along the optical axis from the object side to the imaging surface, it successively includes: a first lens with positive optical power, whose object side is convex; a second lens with negative optical power, whose object side is convex and whose image side is concave; a third lens with positive optical power; a fourth lens with negative optical power, whose object side is concave and whose image side is convex; a fifth lens with positive optical power, whose image side is convex; wherein, the effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 0.95 < TTL / f < 1.05; 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: 0.62 < IH / f < 0.7; the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 3.5 < f3 / f < 4.

2. The optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.5 < f1 / f < 0.6; the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: -1.1 < (R1 - R2) / (R1 + R2) < -0.

9.

3. The optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -0.9 < f2 / f < -0.5; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.3 < (R3 - R4) / (R3 + R4) < 0.

4.

4. The optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -4 < f4 / f < -2; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -0.18 < (R7 - R8) / (R7 + R8) < -0.

05.

5. 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: 3.5 < f5 / f < 5; the effective focal length f of the optical lens and the curvature radius R10 of the image side of the fifth lens satisfy: -8 < R10 / f < -0.

5.

6. The optical lens according to claim 1, characterized in that the combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: 0.1 < f12 / f345 < 0.

3.

7. The optical lens according to claim 1, characterized in that the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -0.25 < f2 / f3 < -0.

1.

8. The optical lens according to claim 1, characterized in that the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.9 < f4 / f5 < -0.

5.

9. The optical lens according to claim 1, wherein, the central thickness CT1 of the first lens and the central thickness CT5 of the fifth lens satisfy: 2.5 < CT1 / CT5 < 3.5; 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: 1.1 < DM11 / DM52 < 1.

4.

10. The optical lens according to claim 1, wherein, 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: 1.45 < TTL / IH < 1.55.

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