Optical lens

Abstract

The application provides an optical lens which is composed of five lenses and sequentially includes, along an optical axis from an object side to an imaging surface, a first lens with positive refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with positive refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive refractive power; a fourth lens with positive refractive power, the object side of which is a concave surface and the image side of which is a convex surface; and a fifth lens with positive refractive power, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis; wherein the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy 14° / mm<FOV / IH<17° / mm. The optical lens provided by the application has an ultrathin small head size and a small total length, guarantees the miniaturization of the head size of the lens and the balance of the large field of view, can reasonably correct the overall aberration of the optical lens, and improves the imaging quality of the optical lens.

Description

Technical Field

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

[0002] With the rapid development of mobile communication and imaging technologies, portable mobile devices such as learning machines, mobile phones, tablets, and smartwatches have placed higher demands on the miniaturization and high-pixel performance of cameras. However, most high-pixel wide-angle lenses currently on the market are relatively large in overall length. How to reduce the weight of the lens while meeting the requirements of high-pixel imaging, and thus enable the optical system to meet the requirements of miniaturization, is an urgent problem to be solved. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens that has one or more advantages such as short overall length, high pixel count, and excellent image quality.

[0004] The technical solution adopted in this invention is as follows:

[0005] An optical lens, consisting of five lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0006] The first lens with positive optical power has a convex object side and a concave image side.

[0007] A second lens with positive optical power has a convex object-side surface and a concave image-side surface;

[0008] A third lens with positive optical power;

[0009] The fourth lens with positive optical power has a concave object side and a convex image side.

[0010] The fifth lens with positive optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis.

[0011] Wherein, 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。

[0012] Further preferably, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 0.8 <R7 / R8<1.1。

[0013] Further preferably, 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。

[0014] 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。

[0015] 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。

[0016] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 60 <f4 / f<180。

[0017] 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。

[0018] Further preferably, the effective focal length f of the optical lens, 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: 40° < (f × FOV) / IH < 48°.

[0019] 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。

[0020] Further preferably, the object-side half-aperture height SAG41 of the fourth lens, the image-side half-aperture height SAG42 of the fourth lens, and the center thickness CT4 of the fourth lens satisfy: -0.5 < (SAG42 - SAG41) / CT4 < -0.35.

[0021] Compared to existing technologies, the optical lens provided by this invention, through specific surface shape settings and reasonable power distribution, achieves an ultra-thin head size and a small overall length; it also enables a large field of view, ensuring a balance between miniaturized head size and a large field of view. Furthermore, the optical lens of this invention can effectively correct overall aberrations, resulting in high pixel count and improved image quality. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

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

[0025] Figure 3This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 4 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 5 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 6 This is a relative illumination curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 7 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0030] Figure 8 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 9 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 11 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 12 This is a relative illumination curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 13 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 14 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 15 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 16 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 17 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 18 This is a relative illumination curve of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 19This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0042] Figure 20 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0043] Figure 21 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 4 of the present invention.

[0044] Figure 22 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0045] Figure 23 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0046] Figure 24 This is a relative illumination curve of the optical lens in Embodiment 4 of the present invention.

[0047] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0048] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this 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.

[0049] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0051] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 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.

[0052] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0053] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] The optical lens provided in this embodiment of the invention consists of five lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

[0056] In some embodiments, the first lens may have positive optical power, with a convex object-side surface and a concave image-side surface. The second lens may have positive optical power, with a convex object-side surface and a concave image-side surface. The third lens may have positive optical power, with either a concave or convex object-side surface and either a concave or convex image-side surface. The fourth lens may have positive optical power, with a concave object-side surface and a convex image-side surface. The fifth lens may have positive optical power, with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis.

[0057] In some embodiments, the optical lens may also include an aperture stop, which may be located between the object side and the first lens. It is understood that the aperture stop is used to limit the amount of light entering the lens to change the brightness of the image.

[0058] 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 and prevent interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0059] 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, so as to enable the optical lens to have good optical performance and capture the details of the photographed object well.

[0060] 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, which is conducive to controlling the shape of the fourth lens, optimizing the aberration balance of the lens group, and improving the imaging quality.

[0061] 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 is conducive to the miniaturization of the optical lens while ensuring sufficient space for the installation and focusing of optical elements.

[0062] 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 and is conducive to the miniaturization of the optical lens.

[0063] 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 significantly converges light rays to shorten the total system length and compensates for the aberrations generated by the front group.

[0064] 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 aberrations and the distortion of the edge field of view brought by the front lens group, making the lens have less distortion and providing a high-definition imaging effect.

[0065] 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 surface curvature, ensure that the edge and the center are clear at the same time, and balance various aberrations generated by the front group of lenses, improving the imaging quality of the optical lens.

[0066] 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, and by reasonably restricting the relationship between the focal length, field angle, and image height of the optical lens, it is conducive to achieving the balance between a large field angle and large target surface imaging of the optical lens, and better meeting the usage requirements of the electronic device camera.

[0067] 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, and 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, which is conducive to achieving large image surface imaging of the lens, while increasing the light input and improving the relative illuminance of the system.

[0068] 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 restricted, which is conducive to the design and processing of the structure of the fourth lens, conducive to correcting the aberration of each field respectively, and conducive to improving the imaging quality of the optical lens.

[0069] 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 characteristics of a large image surface can be realized, thereby improving the imaging quality of the optical system.

[0070] 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. At the same time, when 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.

[0071] 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.

[0072] 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).

[0073] 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.

[0074] 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 meet the requirements of a large image plane while ensuring sufficient image plane brightness in the marginal field of view, preventing the occurrence of vignetting, and thus improving the imaging quality.

[0075] 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 obtaining 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.

[0076] 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.

[0077] 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 meet 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.

[0078] 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 more stable; at the same time, it can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0079] 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. Meeting the above range and reasonably defining the shapes of the object side surface and the image side surface of the fifth lens can control the fifth lens 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.

[0080] 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. Meeting the above range can reasonably allocate the ratio of the combined focal length of the first and second lens combination to the combined focal length of the second and third lens combination, increase the relative illumination of the lens, and improve the imaging quality of the lens.

[0081] 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. Meeting the above conditions enables a reasonable configuration of the ratio of the thickness of the second lens on the optical axis to the thickness of the third lens on the optical axis. The second lens and the third lens can regulate each other to maintain the characteristic of miniaturization of the optical system.

[0082] 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. Meeting the above conditions can effectively compress the total length of the optical lens.

[0083] 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 meet the above relational expression, it is beneficial to the processing and shaping of the lens, beneficial to reducing the assembly difficulty, and can effectively correct the field curvature of the system.

[0084] 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. Meeting the above conditions by 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 is beneficial to correcting the coma of the off-axis field of view and is beneficial to improving the imaging quality of the off-axis field of view of the optical lens.

[0085] 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 meeting the above relational expression, it is beneficial to select appropriate lens materials, thereby effectively correcting chromatic aberration, further improving the imaging clarity of the optical system, and enhancing the imaging quality of the optical system.

[0086] 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 overall 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 overall length, achieving 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, 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.

[0087] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. Additionally, when the lens material is glass, due to the low dispersion characteristic of the glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance between miniaturization of the lens and high image quality.

[0088] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving 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 achieving miniaturization of the lens.

[0089] In each embodiment of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0090] ;

[0091] Where 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 vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, H, I, and J are the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth, and twentieth order surface coefficients, respectively.

[0092] The present invention will be further described below with reference to several 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 tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0093] Example 1

[0094] Please see Figure 1 The diagram shown is a structural schematic of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens includes, along the optical axis from the object side to the imaging plane, the following components in sequence: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and filter G1.

[0095] Among them, the first lens L1 has positive optical power, its object side S1 is convex, and its image side S2 is concave.

[0096] The second lens L2 has positive optical power, its object side S3 is convex, and its image side S4 is concave.

[0097] The third lens L3 has positive optical power, its object side S5 is concave, and its image side S6 is convex.

[0098] The fourth lens L4 has positive optical power, its object side S7 is concave, and its image side S8 is convex.

[0099] The fifth lens L5 has positive optical power, its object side S9 is convex near the optical axis, and its image side S10 is concave near the optical axis.

[0100] The object-side surface S11 and the image-side surface S12 of the filter G1 are both planar.

[0101] The imaging plane S13 is a plane.

[0102] 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.

[0103] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0104] Table 1-1

[0105]

[0106] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0107] Table 1-2

[0108]

[0109] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, transverse chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown.

[0110] Figure 2 The field curvature curve of Example 1 is shown, which represents 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 of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.2 mm to 0.1 mm, indicating that the optical lens 100 can effectively correct the field curvature.

[0111] Figure 3 The F-Tan(θ) distortion curves of Example 1 are shown, representing the F-Tan(θ) distortion at different field of view angles on the imaging plane. The horizontal axis represents the F-Tan(θ) distortion value (unit: %), and the vertical axis represents the field of view angle (unit: °). As can be seen from the figure, 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.

[0112] Figure 4 The transverse chromatic aberration curve of Example 1 is shown, representing the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different field angles on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2 μm, indicating that the optical lens 100 can excellently correct the chromatic aberration of each field of view.

[0113] Figure 5The axial aberration curves of Example 1 are shown, representing the aberrations of each wavelength along the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.05 mm, indicating that the optical lens 100 can effectively correct axial aberrations.

[0114] Figure 6 The relative illumination curves for Example 1 are shown, representing 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.

[0115] Example 2

[0116] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S5 of the third lens L3 is a convex surface; the image side S6 of the third lens L3 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0117] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0118] Table 2-1

[0119]

[0120] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0121] Table 2-2

[0122]

[0123] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, transverse chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 200 are respectively as follows: Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown.

[0124] from Figure 8 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0125] from Figure 9As can be seen, the F-Tan(θ) distortion of optical lens 200 is controlled within 0~2.5%, indicating that the distortion of optical lens 200 has been well corrected.

[0126] from Figure 10 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 200 can correct the chromatic aberration of each field of view very well.

[0127] from Figure 11 As can be seen, the axial aberration offset is controlled within -0.03mm to 0.05mm, indicating that the optical lens 200 can correct axial aberration well.

[0128] from Figure 12 As can be seen, the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 200 has good relative illumination.

[0129] Example 3

[0130] Please see Figure 13 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0131] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0132] Table 3-1

[0133]

[0134] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0135] Table 3-2

[0136]

[0137] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, transverse chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 300 are respectively as follows: Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 As shown.

[0138] from Figure 14 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.2mm to 0.1mm, indicating that the optical lens 300 can effectively correct the field curvature.

[0139] from Figure 15 As can be seen, the F-Tan(θ) distortion of optical lens 300 is controlled within 0~2.5%, indicating that the distortion of optical lens 300 has been well corrected.

[0140] from Figure 16 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 300 can correct the chromatic aberration of each field of view very well.

[0141] from Figure 17 As can be seen, the axial aberration offset is controlled within ±0.05mm, indicating that the optical lens 300 can correct axial aberration well.

[0142] from Figure 18 As can be seen, the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 300 has good relative illumination.

[0143] Example 4

[0144] Please see Figure 19 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0145] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0146] Table 4-1

[0147]

[0148] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0149] Table 4-2

[0150]

[0151] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, transverse chromatic aberration curve, axial aberration curve, and relative illumination curve of the optical lens 400 are respectively as follows: Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 As shown.

[0152] from Figure 20 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.2mm to 0.1mm, indicating that the optical lens 400 can effectively correct the field curvature.

[0153] from Figure 21 As can be seen, the F-Tan(θ) distortion of optical lens 400 is controlled within 0~2.5%, indicating that the distortion of optical lens 400 has been well corrected.

[0154] from Figure 22 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 400 can correct the chromatic aberration of each field of view very well.

[0155] from Figure 23 As can be seen, the axial aberration offset is controlled within ±0.05mm, indicating that the optical lens 400 can effectively correct axial aberration.

[0156] from Figure 24 As can be seen, the relative illumination value of the optical lens is greater than 20%, indicating that the optical lens 400 has good relative illumination.

[0157] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0158] Table 5

[0159]

[0160] In summary, the optical lens provided by the present invention has at least the following advantages:

[0161] (1) By setting specific surface shapes and reasonable optical power distribution, the lens can effectively limit the length of the lens, so that the lens has an ultra-thin head size and a small total length; it 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.

[0162] (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 pixel count and small distortion, thereby improving the imaging quality of the optical lens.

[0163] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0164] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens, comprising five lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with positive optical power has a convex object side and a concave image side. A second lens with positive optical power has a convex object-side surface and a concave image-side surface; A third lens with positive optical power; The fourth lens with positive optical power has a concave object side and a convex image side. The fifth lens with positive optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis. Wherein, 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。 2. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R7 and the image-side radius of curvature R8 of the fourth lens satisfy: 0.8 <R7 / R8<1.1。 3. The optical lens according to claim 1, characterized in that, The back focal length (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following condition: 0.

28. <BFL / TTL<0.4。 4. The optical lens according to claim 1, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, The effective focal length f of the optical lens, 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 the following condition: 40° < (f × FOV) / IH < 48°.

9. 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: 0.2 <f1 / f5<0.55。 10. The optical lens according to claim 1, characterized in that, The object-side half-aperture height SAG41 of the fourth lens, the image-side half-aperture height SAG42 of the fourth lens, and the center thickness CT4 of the fourth lens satisfy the following condition: -0.5 < (SAG42 - SAG41) / CT4 < -0.35.

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