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 positive optical power, whose object side is convex and whose image side is concave; a second lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave; a third lens with positive optical power; 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 near the optical axis and whose image side is concave near the optical axis; wherein, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.08 < f1 / f2 < 0; the maximum optical aperture SD1 of the first lens satisfies: 0.95 mm < SD1 < 1.1 mm. The optical lens provided by the present invention has an ultra-thin and small head size and a small overall length; it ensures the balance of the miniaturization of the head size of the lens and a large field of view. It can reasonably correct the overall aberration of the optical lens and improve 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] With the rapid development of the electronics industry, the mobile phone and tablet产业链 is also being rapidly updated. The product requirements are getting higher and higher, with beautiful appearance and comprehensive integrated functions, making the manufacturing industry face increasingly severe challenges. The field of view angle of an ordinary camera is about 78°, and the distortion is relatively large. When a high-pixel chip is installed, the target surface is larger, resulting in a larger effective focal length and overall optical length of the optical lens, which is not conducive to the overall miniaturization of the lens. Summary of the Invention

[0003] 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 an ultra-thin and small head size, a small overall length, a high pixel, 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 a positive optical power, whose object side is convex and whose image side is concave;

[0007] A second lens with a negative optical power, whose object side is convex near the optical axis and whose image side is concave;

[0008] A third lens with a positive optical power;

[0009] A fourth lens with a positive optical power, whose object side is concave and whose image side is convex;

[0010] A fifth lens with a negative optical power, whose object side is concave near the optical axis and whose image side is concave near the optical axis;

[0011] Wherein, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.08 < f1 / f2 < 0; the maximum optical aperture SD1 of the first lens satisfies: 0.95 mm < SD1 < 1.1 mm.

[0012] Further preferably, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 75 < f3 / f4 < 90.

[0013] More preferably, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -4.5 < f1 / f5 < -3; the clear aperture semi-diameter DM11 of the object side surface of the first lens and the clear aperture semi-diameter DM52 of the image side surface of the fifth lens satisfy: 0.2 < DM11 / DM52 < 0.28.

[0014] More preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.4; 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: 0.35 < R1 / R2 < 0.5.

[0015] More preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -42 < f2 / f < -30; 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: 1 < R3 / R4 < 1.2.

[0016] More preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 25 < f3 / f < 45.

[0017] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.3 < f4 / f < 0.5; 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: 1.25 < (R7 + R8) / (R7 - R8) < 1.5.

[0018] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.45 < f5 / f < -0.3; the sagittal height SAG51 of the clear aperture of the object side surface of the fifth lens and the sagittal height SAG52 of the clear aperture of the image side surface of the fifth lens satisfy: 0.85 < SAG51 / SAG52 < 1.65.

[0019] More preferably, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.2 < TTL / f < 1.3; 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: 0.55 < TTL / IH < 0.58.

[0020] More preferably, the combined focal length f12 of the first lens and the second lens and the focal length f5 of the fifth lens satisfy: -4 < f12 / f5 < -3.

[0021] Compared with the prior art, the optical lens provided by the present invention has an ultra-thin small head size and a small total length through a specific surface shape setting and a reasonable optical power distribution, and can also achieve a large field of view of the lens, ensuring the miniaturization of the head size of the lens and the balance of the large field of view. In addition, the optical lens of the present invention can also reasonably correct the overall aberration of the optical lens, so that the optical lens has high pixels and improves the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0024] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0025] Figure 3 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 1 of the present invention.

[0026] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0027] Figure 5 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0028] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0029] Figure 7 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0030] Figure 8 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 2 of the present invention.

[0031] Fig. 9 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0032] Fig.10 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0033] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0034] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0035] Fig.134 is a F-Tanθ distortion curve diagram of the optical lens in Example 3 of the present invention.

[0036] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0037] Fig.15 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0038] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0039] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0040] Fig.18 4 is a F-Tanθ distortion curve of the optical lens in Example 4 of the present invention.

[0041] Fig.19 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0042] Fig. 20 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0043] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 negative optical power, its object side surface is convex at the near optical axis, and its image side surface is concave. The third 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 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 at the near optical axis, and its image side surface is concave at the near optical axis.

[0053] In some embodiments, the optical lens may further include a diaphragm, which may be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image.

[0054] 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 interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0055] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.08 < f1 / f2 < 0. Meeting the above range, by reasonably setting the focal length relationship of the first two lenses, the light entering the first and second lenses can be well converged into the optical system, realizing a large field of view while reducing the head size of the lens and achieving a small aperture of the lens.

[0056] In some embodiments, the maximum optical aperture SD1 of the first lens satisfies: 0.95 mm < SD1 < 1.1 mm. Meeting the above conditions, the effective aperture of the first lens can be controlled within 1.1 mm, which is beneficial to realizing the characteristic of a small head of the lens, facilitating the improvement of the screen-to-body ratio of the electronic device carried, and meeting the market needs.

[0057] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 75 < f3 / f4 < 90. Meeting the above range is beneficial to the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0058] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -4.5 < f1 / f5 < -3; the half-aperture DM11 of the object side surface of the first lens and the half-aperture DM52 of the image side surface of the fifth lens satisfy: 0.2 < DM11 / DM52 < 0.28. Meeting the above range, by reasonably setting the focal length relationship of the first and last lenses in the lens, while ensuring that as much light as possible enters the system, the area of light entering the imaging surface is increased, and the balance between the large field of view and the large image surface of the lens is better achieved.

[0059] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.4; 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: 0.35 < R1 / R2 < 0.5. Meeting the above range, by setting the first lens to have a large positive refractive power, the light entering the first lens can be well converged into the optical system, realizing a large field of view while facilitating the reduction of the difficulty of aberration correction and ensuring the imaging quality of the optical lens.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -42 < f2 / f < -30; 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: 1 < R3 / R4 < 1.2. Meeting the above ranges, by reasonably setting the focal length and surface shape 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 and reduce the difficulty of correcting aberration.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 25 < f3 / f < 45. Meeting the above range, by reasonably setting the focal length of the third lens, the light can be effectively converged, the difficulty of correcting the distortion of the edge field of view can be reduced, ensuring that the lens has a small distortion while achieving a large field of view angle, and improving the overall imaging quality.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.3 < f4 / f < 0.5; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.25 < (R7 + R8) / (R7 - R8) < 1.5. Meeting the above ranges, by setting the fourth lens to have a large positive refractive power, the aberration of the edge field of view can be effectively improved, and the overall imaging quality of the optical lens can be enhanced.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.45 < f5 / f < -0.3; the sagittal height SAG51 of the object side surface of the fifth lens at the clear aperture and the sagittal height SAG52 of the image side surface of the fifth lens at the clear aperture satisfy: 0.85 < SAG51 / SAG52 < 1.65. Meeting the above ranges, excessive light deflection can be avoided, and at the same time, the light focusing position can be adjusted, enhancing the light converging ability of the system and better realizing the miniaturization of the lens.

[0064] In some embodiments, the effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 1.2 < TTL / f < 1.3. Meeting the above range, the length of the lens can be effectively limited, which is beneficial to the miniaturization of the optical lens. 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: 0.55 < TTL / IH < 0.58. Meeting the above ranges, by reasonably restricting the ratio of the overall optical length of the optical lens to the image height, it is possible to achieve large target surface imaging while shortening the overall optical length, achieving the balance between the miniaturization of the optical lens and large target surface imaging, and improving the market competitiveness.

[0065] In some embodiments, the combined focal length f12 of the first lens and the second lens and the focal length f5 of the fifth lens satisfy: -4 < f12 / f5 < -3. Meeting the above range is beneficial to correcting various aberrations of the system and achieving a large field of view of the lens.

[0066] In some embodiments, the true image height corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 5.3 < IH / EPD < 5.6. Meeting the above range is beneficial to achieving the balance of a small head size and a large image plane of the lens.

[0067] 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 < 0.45; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.25 < BFL / TTL < 0.36. Meeting the above range can make the lens have a larger back focus, which is beneficial to the assembly of the module and avoids mechanical interference between the lens and the module.

[0068] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1 < CT1 / CT2 < 2.5. The distance CT12 between the first lens and the second lens on the optical axis and the central thickness CT2 of the second lens satisfy: 0.45 < CT12 / CT2 < 1. Meeting the above range, by reasonably distributing the central thickness and interval of the first and second lenses, while meeting the requirements of assembly stability, the assembly deformation and assembly difficulty of the lens can be reduced, and at the same time, the structure of the lens is more compact, which is beneficial to realizing the miniaturization of the lens.

[0069] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 2.5 < f12 / f34 < 4. Meeting the above range, by reasonably setting the power distribution of each lens, the incident light can be diverged to a certain extent, which is beneficial to achieving a large field of view and large target surface imaging of the lens.

[0070] In some embodiments, the optical lens satisfies the conditional formula: 2.5 mm < f < 2.6 mm, 90° < FOV < 100°, 3 mm < TTL < 3.3 mm, 5 mm < IH < 6 mm, 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 total optical length of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle 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 a large wide angle and a short total length.

[0071] In some embodiments, the lens material in the optical lens provided by the present invention may be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt a full plastic lens structure, which not only makes the lens have excellent imaging performance, but also makes the structure of the lens more compact, and can better achieve a balance between miniaturization of the lens and high image quality.

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

[0073] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0074] ;

[0075] Among them, z is the distance between the surface and the vertex of the surface 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, B, C, D, E, F, G, H, I, and J are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, eighteenth-order, and twentieth-order surface coefficients respectively.

[0076] 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.

[0077] Example 1

[0078] 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.

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

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

[0081] The third lens L3 has positive refractive power, its object side surface S5 is convex at the near optical axis, and its image side surface S6 is convex;

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

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

[0084] The object side surface S11 and the image side surface S12 of the filter G1 are both planes;

[0085] The imaging surface S13 is a plane.

[0086] 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.

[0087] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0088] Table 1-1

[0089]

[0090] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0091] Table 1-2

[0092]

[0093] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0094] Figure 2The 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 ±0.15 mm, indicating that the optical lens 100 can well correct the field curvature.

[0095] 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 ±2.4%, indicating that the distortion of the optical lens 100 is well corrected.

[0096] Figure 4 The vertical axis 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 axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 100 can extremely well correct the chromatic aberration of each field of view.

[0097] Figure 5 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, 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, indicating that the optical lens 100 can better correct the axial aberration.

[0098] Example 2

[0099] 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 difference between this embodiment and Example 1 is that the image side surface S6 of the third lens L3 is concave at the near optical axis, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0100] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0101] Table 2-1

[0102]

[0103] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0104] Table 2-2

[0105]

[0106] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 and Fig.10 shown.

[0107] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.4 mm, indicating that the optical lens 200 can correct the field curvature well.

[0108] from Figure 8 It can be seen that the F-Tanθ distortion of the optical lens 200 is controlled within ±2.4%, indicating that the distortion of the optical lens 200 is well corrected.

[0109] 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.

[0110] from Fig.10 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0111] Example 3

[0112] 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 difference between this embodiment and Example 1 is that the object side surface S5 of the third lens L3 is a concave surface, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

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

[0114] Table 3-1

[0115]

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

[0117] Table 3-2

[0118]

[0119] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 and Fig.15 shown.

[0120] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.3 mm, indicating that the optical lens 300 can correct the field curvature well.

[0121] from Fig.13 It can be seen that the F-Tanθ distortion of the optical lens 300 is controlled within ±2.4%, indicating that the distortion of the optical lens 300 is well corrected.

[0122] from Fig.14 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 300 can extremely well correct the chromatic aberration of each field of view.

[0123] from Fig.15 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0124] Example 4

[0125] See also Fig.16 , shown is a schematic diagram of the structure of the optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the object side surface S5 of the third lens L3 is a concave surface, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0126] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0127] Table 4-1

[0128]

[0129] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0130] Table 4-2

[0131]

[0132] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19and Fig. 20 shown.

[0133] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.3mm, indicating that the optical lens 400 can correct the field curvature well.

[0134] from Fig.18 It can be seen that the F-Tanθ distortion of the optical lens 400 is controlled within ±2.4%, indicating that the distortion of the optical lens 400 is well corrected.

[0135] from Fig.19 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 400 can extremely well correct the chromatic aberration of each field of view.

[0136] from Fig. 20 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0137] Please refer to Table 5, 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.

[0138] Table 5

[0139]

[0140] In summary, the optical lens provided by the present invention has at least the following advantages:

[0141] (1) Through specific surface shape settings and reasonable optical focal length distribution, the lens can effectively limit the length of the lens, making the lens have an ultra-thin small head size and a small total length; it can also achieve a large field of view of the lens, ensuring the miniaturization of the lens head size and the balance of the large field of view.

[0142] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens, so that the optical lens has high pixels and improves the imaging quality of the optical lens.

[0143] 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.

[0144] 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, consisting of five lenses, characterized in that: From the object side to the imaging surface along the optical axis, it successively includes: A first lens with positive optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave; A third lens with positive optical power; 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 near the optical axis and whose image side is concave near the optical axis; Wherein, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.08 < f1 / f2 < 0; the maximum optical aperture SD1 of the first lens satisfies: 0.95mm < SD1 < 1.1mm; the effective focal length f of the optical lens and the optical total length TTL of the optical lens satisfy: 1.2 < TTL / f < 1.3; the optical total 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: 0.55 < TTL / IH < 0.

58.

2. The optical lens according to claim 1, characterized in that: The focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 75 < f3 / f4 < 90.

3. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -4.5 < f1 / f5 < -3; 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: 0.2 < DM11 / DM52 < 0.

28.

4. 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: 1.1 < f1 / f < 1.4; 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: 0.35 < R1 / R2 < 0.

5.

5. 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: -42 < f2 / f < -30; 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: 1 < R3 / R4 < 1.

2.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 25 < f3 / f < 45.

7. 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: 0.3 < f4 / f < 0.5; 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: 1.25 < (R7 + R8) / (R7 - R8) < 1.

5.

8. 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: -0.45 < f5 / f < -0.3; the sagitta SAG51 of the object side of the fifth lens at the clear aperture and the sagitta SAG52 of the image side of the fifth lens at the clear aperture satisfy: 0.85 < SAG51 / SAG52 < 1.

65.

9. 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 focal length f5 of the fifth lens satisfy: -4 < f12 / f5 < -3.

Images