Optical lens

Abstract

The invention provides an optical lens, which is composed of five lenses, and sequentially comprises 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 from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power; 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; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface near the optical axis, and the image side surface of the fifth lens is a concave surface near the optical axis; wherein the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet the following conditions: 14 degrees / mmlt; fOV / IHlt; and 17 degrees / mm. The optical lens provided by the invention is ultrathin, small in head size and small in total length; the head size miniaturization of the lens and the balance of a large field angle are ensured; the overall aberration of the optical lens can be reasonably corrected, and the imaging quality of the optical lens is improved.

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 technologies, portable mobile devices such as learning machines, cell phones, tablets, and smartwatches are placing higher demands on camera miniaturization and high-pixel performance. However, most high-pixel wide-angle lenses currently on the market are relatively long. How to achieve high-pixel imaging while reducing lens weight and miniaturizing the optical system remains a pressing challenge. Summary of the Invention

[0003] In view of the above problems, the object of the present invention is to provide an optical lens having one or more advantages such as short total length, high pixel count, and excellent imaging quality.

[0004] The technical solution adopted in the present invention is: An optical lens, consisting of five lenses, including the following elements along the optical axis from the object side to the imaging surface: 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 refractive power, whose object-side surface is convex and whose image-side surface is concave; a third lens having positive optical power; a fourth lens element having positive refractive power, whose object-side surface is concave and whose image-side surface is convex; a fifth lens element having positive refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis; The maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 14° / mm <FOV / IH<17° / mm。

[0005] Further preferably, the object side curvature radius R7 of the fourth lens and the image side curvature radius R8 of the fourth lens satisfy: 0.8 <R7 / R8<1.1。

[0006] Further preferably, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens meet the following relationship: 0.28 <BFL / TTL<0.4。

[0007] Further preferably, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.1 <TTL / f<1.4。

[0008] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.8 <f2 / f<1.2。

[0009] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 60 <f4 / f<180。

[0010] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 200 <f5 / f<360。

[0011] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 40°<(f×FOV) / IH<48°.

[0012] Further preferably, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 0.2 <f1 / f5<0.55。

[0013] Further preferably, the object-side clear light semi-aperture sag SAG41 of the fourth lens, the image-side clear light semi-aperture sag SAG42 of the fourth lens, and the center thickness CT4 of the fourth lens satisfy: -0.5<(SAG42-SAG41) / CT4<-0.35.

[0014] Compared to existing technologies, the optical lens provided by the present invention, through a specific surface shape and rational optical power distribution, achieves an ultra-thin, small head size and a short overall length. It also achieves a wide field of view, ensuring a balanced balance between a small head size and a wide field of view. Furthermore, the optical lens of the present invention can rationally correct for overall aberrations, resulting in a high pixel count and improved imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0017] Figure 3 2 is a graph showing the F-Tan(θ) distortion curve of the optical lens in Example 1 of the present invention.

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

[0019] Figure 5 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

[0020] Figure 6 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.

[0021] Figure 7 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0022] Figure 8 Graph showing the field curvature of the optical lens in Example 2 of the present invention.

[0023] Figure 9 2 is a graph showing the F-Tan(θ) distortion curve of the optical lens in Example 2 of the present invention.

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

[0025] Figure 11 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0026] Figure 12 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.

[0027] Figure 13 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0028] Figure 14 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0029] Figure 15 2 is a graph showing the F-Tan(θ) distortion curve of the optical lens in Example 3 of the present invention.

[0030] Figure 16 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0031] Figure 17 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0032] Figure 18 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.

[0033] Figure 19 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0034] Figure 20 4 is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0035] Figure 214 is a graph showing the F-Tan(θ) distortion curve of the optical lens in Example 4 of the present invention.

[0036] Figure 22 Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0037] Figure 23 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0038] Figure 24 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.

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

[0040] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0042] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[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 preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] The optical lens provided in an embodiment of the present invention is composed of five lenses, which are, in order from the object side to the imaging surface along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

[0048] In some embodiments, the first lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The second lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The third lens may have positive optical power, with its object-side surface being concave or convex, and its image-side surface being concave or convex. The fourth lens may have positive optical power, with its object-side surface being concave and its image-side surface being convex. The fifth lens may have positive optical power, with its object-side surface being convex near the optical axis and its image-side surface being concave near the optical axis.

[0049] In some embodiments, the optical lens may further include an aperture, which may be located between the object side and the first lens. It is understood that the aperture is used to limit the amount of light entering 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 interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0051] In some embodiments, the maximum field of view FOV of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 14° / mm < FOV / IH < 17° / mm. Meeting the above conditions can ensure that the optical lens has a large field of view characteristic on the premise of meeting the image height requirement, thereby enabling the optical lens to have good optical performance and capturing the details of the photographed object well.

[0052] In some embodiments, 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: 0.8 < R7 / R8 < 1.1. Meeting the above conditions can reasonably control the radii of curvature of the object side surface and the image side surface of the fourth lens, thereby facilitating the control of the shape of the fourth lens, optimizing the aberration balance of the lens group, and improving the imaging quality.

[0053] In some embodiments, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.28 < BFL / TTL < 0.4. Meeting the above conditions can reasonably configure the ratio of the back focal length of the optical lens to the total optical length of the optical lens, which is conducive to achieving a short back focal length of the optical lens and facilitating the miniaturization of the optical lens while ensuring sufficient space for the installation and focusing of optical components.

[0054] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.1 < TTL / f < 1.4. Meeting the above conditions can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens.

[0055] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.8 < f2 / f < 1.2. Meeting the above conditions, the second lens converges light rays significantly to shorten the total system length and compensate for the aberration generated by the front group.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 60 < f4 / f < 180. Meeting the above conditions, the fourth lens can converge the incident light rays at the front end, which is conducive to correcting the aberration and distortion of the edge field of view brought by the front-end lens group, making the lens have less distortion and providing a high-definition imaging effect.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 200 < f5 / f < 360. Meeting the above conditions, the fifth lens cooperates with the fourth lens to correct the image plane curvature, ensure that the edge and the center are clear simultaneously, and balance various aberrations generated by the front group of lenses, thus improving the imaging quality of the optical lens.

[0058] In some embodiments, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 40° < (f × FOV) / IH < 48°. By satisfying the above conditional formula, by reasonably restricting the relationship between the focal length, field angle, and image height of the optical lens, it is beneficial to achieve the balance between the large field angle of the optical lens and large target surface imaging, and better meet the usage requirements of the electronic device camera.

[0059] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 0.2 < f1 / f5 < 0.55. By satisfying the above conditions, by reasonably setting the focal length relationship between 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, which is beneficial to achieving large image surface imaging of the lens, while increasing the light input and improving the relative illumination of the system.

[0060] In some embodiments, the object-side clear aperture sag SAG41 of the fourth lens, the image-side clear aperture sag SAG42 of the fourth lens, and the central thickness CT4 of the fourth lens satisfy: -0.5 < (SAG42 - SAG41) / CT4 < -0.35. By controlling the relationship between the sag height difference between the image side and the object side of the fourth lens and the central thickness of the fourth lens, the shape of the fourth lens can be constrained, which is beneficial to the design and processing of the structure of the fourth lens, beneficial to correcting the aberration of each field respectively, and beneficial to improving the imaging quality of the optical lens.

[0061] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < IH / f < 2.2. By satisfying the above conditions, a larger field angle and imaging range can be achieved, and while ensuring the depth of field of the optical lens, the large image surface characteristics can be realized, thereby improving the imaging quality of the optical system.

[0062] In some embodiments, the back focal length BFL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.5 < TTL / IH < 0.65. By satisfying the above conditions, the miniaturization of the lens can be better achieved, and while ensuring the same total length of the lens, it has a larger image surface and can match a larger-sized imaging chip to achieve high-definition imaging.

[0063] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 65 < f1 / f < 150. By satisfying the above conditions, the first lens converges light and initially corrects spherical aberration and coma, balancing light convergence and aberration control.

[0064] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 250 < f3 / f < 450. Meeting the above conditions, the third lens can finely adjust the chief ray angle, control the uniformity of the image plane illuminance, and balance the high-order aberrations (such as distortion and lateral chromatic aberration).

[0065] In some embodiments, the maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 35° < FOV / Fno < 40°. Meeting the above conditions is beneficial to improving the light input of the lens, enabling the lens to achieve high-definition imaging even in a dim environment.

[0066] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.5 < IH / EPD < 5.2. Meeting the above range enables the optical lens to satisfy a large image plane while also ensuring sufficient image plane brightness in the marginal field of view, preventing the occurrence of vignetting, and thus improving the imaging quality.

[0067] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.3 < BFL / f < 0.5. Meeting the above range is beneficial to achieving a balance between good imaging quality and an optical back focal length that is easy to assemble. While ensuring the imaging quality of the optical lens, it avoids interference between the lens and other components, reducing the assembly process difficulty of the camera module.

[0068] In some embodiments, 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 < R1 / R2 < 1.2. Meeting the above conditions can reasonably set the surface shape of the first lens, enhance the light collection ability of the first lens, and thus achieve a larger field angle.

[0069] In some embodiments, 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 < 0.4. By making the optical system satisfy the above relational expression, it is beneficial to reasonably configure the ratio of the curvature radius of the object side surface of the second lens to the curvature radius of the image side surface of the second lens, control the shape of the second lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, and reduce the risk of ghosting, improving the resolution ability of the optical system.

[0070] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -290 < (R5 + R6) / (R5 - R6) < -75. Meeting the above range can make the light trend smoother; at the same time, it can correct coma and field curvature, improve the flatness of the image, and enhance the imaging quality of the optical lens.

[0071] 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: 9 < (R9 + R10) / (R9 - R10) < 17. By satisfying the above range and reasonably defining the shapes of the object side surface and the image side surface of the fifth lens, the fifth lens can be controlled to have an appropriate surface shape, which helps to control the light trend of the marginal field of view and improve the imaging quality of the marginal field of view.

[0072] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f23 of the second lens and the third lens satisfy: 0.9 < f12 / f23 < 1.2. By satisfying the above range, the ratio of the combined focal length of the first and second lenses to the combined focal length of the second and third lenses can be reasonably allocated, increasing the relative illumination of the lens and improving the imaging quality of the lens.

[0073] In some embodiments, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 1.3 < CT2 / CT3 < 1.7. By satisfying the above conditions, the ratio of the thickness of the second lens on the optical axis to the thickness of the third lens on the optical axis is reasonably configured, and the second lens and the third lens can be mutually adjusted to maintain the characteristic of miniaturization of the optical system.

[0074] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis respectively and the total optical length TTL of the optical lens satisfy: 0.4 < ∑CT / TTL < 0.5. By satisfying the above conditions, the total length of the optical lens can be effectively compressed.

[0075] In some embodiments, the central thickness CT2 of the second lens and the edge thickness ET2 of the second lens satisfy: 1.4 < CT2 / ET2 < 1.7. By making the optical system satisfy the above relational expression, it is beneficial to the processing and forming of the lens, beneficial to reducing the assembly difficulty, and can effectively correct the field curvature of the system.

[0076] In some embodiments, the sagittal height SAG51 of the object side surface clear aperture of the fifth lens, the sagittal height SAG52 of the image side surface clear aperture of the fifth lens and the central thickness CT5 of the fifth lens satisfy: -0.6 < (SAG52 - SAG51) / CT5 < -0.15. By satisfying the above conditions and controlling the relationship between the height difference of the sagittal heights of the image side surface and the object side surface of the fifth lens and the central thickness of the fifth lens, it is beneficial to correct the coma of the off-axis field of view and improve the imaging quality of the off-axis field of view of the optical lens.

[0077] In some embodiments, the Abbe number Vd2 of the second lens and the Abbe number Vd3 of the third lens satisfy: 30 < Vd2 - Vd3 < 40. When the above relational expression is satisfied, it is beneficial to select appropriate lens materials, so that chromatic aberration can be effectively corrected, and further the imaging clarity of the optical system can be improved and the imaging quality of the optical system can be enhanced.

[0078] In some embodiments, the optical lens satisfies the conditional formula: 2.6 mm < f < 3 mm, 85° < FOV < 95°, 3 mm < TTL < 3.8 mm, 5 mm < IH < 6.5 mm, 2.2 < Fno < 2.6; where f represents the effective focal length of the optical lens, FOV represents the maximum field angle of view of the optical lens, TTL represents the total optical length of the optical lens, IH represents the true image height corresponding to the maximum field angle of view 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 at least: has a short total length, realizing miniaturization of the lens; has a short focal length feature, and 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; has a large field angle of view, providing a wider shooting field of view for application scenarios such as the front view lens of an electronic device and capturing more image information; has a large imaging surface, and can be matched with a larger size chip to achieve high-definition imaging; has a large aperture, and can achieve high-definition imaging even in a complex light environment.

[0079] 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 by 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 enables the structure of the lens to be relatively compact, and can better achieve the balance between miniaturization of the lens and high image quality.

[0080] 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.

[0081] In each embodiment of the present invention, when the lens adopts an aspherical lens, the surface shapes of the aspherical surfaces of the optical lens satisfy the following equation: ; 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, J are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, eighteenth-order, and twentieth-order curved surfaces respectively.

[0082] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0083] Example 1 See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention, which includes, along the optical axis from the object side to the imaging surface, an aperture ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

[0084] 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, its object-side surface S3 is convex, and its image-side surface S4 is concave; 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 positive refractive power, its object-side surface S9 is convex at the near optical axis, and its image-side surface S10 is concave at the near optical axis; The object-side surface S11 and the image-side surface S12 of the filter G1 are both flat surfaces; 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 The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0088] Table 1-2 In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, vertical axis chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 shown.

[0089] Figure 2 The field curvature curve for Example 1 shows the degree of curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: degrees). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within a range of -0.2mm to 0.1mm, indicating that the optical lens 100 can effectively correct field curvature.

[0090] Figure 3 The F-Tan(θ) distortion curve for Example 1 is shown, representing the F-Tan(θ) distortion at different field angles on the imaging plane. The horizontal axis represents the F-Tan(θ) distortion value (unit: %), and the vertical axis represents the field angle (unit: °). As can be seen from the graph, the F-Tan(θ) distortion of the optical lens 100 is controlled within 0-2.5%, indicating that the distortion of the optical lens 100 is well corrected.

[0091] Figure 4 The vertical chromatic aberration curve for Example 1 shows the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different viewing angles on the imaging surface. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the viewing angle (unit: degrees). As can be seen from the figure, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±2 μm, indicating that the optical lens 100 can excellently correct chromatic aberration in all viewing fields.

[0092] 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 plane, with the horizontal axis representing the axial aberration value (unit: mm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.05mm, indicating that the optical lens 100 is able to correct the axial aberration well.

[0093] Figure 6 The relative illumination curve of Example 1 is shown, which represents the relative illumination values ​​at different field angles on the imaging plane. The horizontal axis represents the field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 100 has good relative illumination.

[0094] Example 2 See also Figure 7 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S5 of the third lens L3 is convex; the image-side surface S6 of the third lens L3 is concave; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0095] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0096] Table 2-1 The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0097] Table 2-2 In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, vertical axis chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 200 are shown as follows: Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 shown.

[0098] from Figure 8 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can correct the field curvature well.

[0099] from Figure 9 It can be seen from the figure that the F-Tan(θ) distortion of the optical lens 200 is controlled within 0~2.5%, indicating that the distortion of the optical lens 200 is well corrected.

[0100] from Figure 10 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 200 can perfectly correct the chromatic aberration of each field of view.

[0101] from Figure 11 It can be seen from the figure that the offset of the axial aberration is controlled within -0.03mm~0.05mm, which shows that the optical lens 200 can correct the axial aberration well.

[0102] from Figure 12 It can be seen from the figure that the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 200 has good relative illumination.

[0103] Example 3 See also Figure 13, shown is a schematic structural diagram of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0104] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0105] Table 3-1 The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0106] Table 3-2 In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, vertical axis chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 300 are shown as follows: Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 shown.

[0107] from Figure 14 It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.2mm~0.1mm, indicating that the optical lens 300 can correct the field curvature well.

[0108] from Figure 15 It can be seen from the figure that the F-Tan(θ) distortion of the optical lens 300 is controlled within 0~2.5%, indicating that the distortion of the optical lens 300 is well corrected.

[0109] from Figure 16 As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 300 can perfectly correct the chromatic aberration of each field of view.

[0110] from Figure 17 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.05 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0111] from Figure 18 It can be seen from the figure that the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 300 has good relative illumination.

[0112] Example 4 See also Figure 19, shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment is that 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 400 in Example 4 are shown in Table 4-1.

[0114] Table 4-1 The surface parameters of the aspheric lens of the optical lens in Example 4 are shown in Table 4-2.

[0115] Table 4-2 In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, vertical axis chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 400 are shown as follows: Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 shown.

[0116] from Figure 20 It can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.2mm~0.1mm, indicating that the optical lens 400 can correct the field curvature well.

[0117] from Figure 21 It can be seen from the figure that the F-Tan(θ) distortion of the optical lens 400 is controlled within 0~2.5%, indicating that the distortion of the optical lens 400 is well corrected.

[0118] from Figure 22 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 excellently correct the chromatic aberration of each field of view.

[0119] from Figure 23 It can be seen that the offset of the axial aberration is controlled within ±0.05 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0120] from Figure 24 It can be seen from the figure that the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 400 has good relative illumination.

[0121] Please refer to Table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, chief ray incidence angle CRA at the maximum image height, maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0122] Table 5 In summary of the above embodiments, 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 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.

[0123] (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 small distortion, thereby improving the imaging quality of the optical lens.

[0124] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0125] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, consisting of five lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: 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 refractive power, whose object-side surface is convex and whose image-side surface is concave; a third lens having positive optical power; a fourth lens element having positive refractive power, whose object-side surface is concave and whose image-side surface is convex; a fifth lens element having positive refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis; The maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 14° / mm <FOV / IH<17° / mm。 2. The optical lens according to claim 1, wherein: The object side curvature radius R7 of the fourth lens and the image side curvature radius R8 of the fourth lens satisfy: 0.8 <R7 / R8<1.1。 3. The optical lens according to claim 1, wherein: The back focal length BFL of the optical lens and the total optical length TTL of the optical lens meet the following conditions: 0.28 <BFL / TTL<0.4。 4. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.1 <TTL / f<1.4。 5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0.8 <f2 / f<1.2。 6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 60 <f4 / f<180。 7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 200 <f5 / f<360。 8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy the following conditions: 40°<(f×FOV) / IH<48°.

9. The optical lens according to claim 1, wherein: The focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 0.2 <f1 / f5<0.55。 10. The optical lens according to claim 1, wherein: The object side light semi-aperture sag SAG41 of the fourth lens, the image side light semi-aperture sag SAG42 of the fourth lens and the center thickness CT4 of the fourth lens satisfy: -0.5<(SAG42-SAG41) / CT4<-0.35.

Images