Optical lens

Abstract

The present invention provides an optical lens having a total of five lenses, which include, in order from the object side to the imaging surface along the optical axis: a first lens having positive focal power, whose object side surface is convex and whose image side surface is concave; a second lens having positive focal power; a third lens having positive focal power, whose object side surface is concave and whose image side surface is convex; a fourth lens having positive focal power, whose object side surface is concave and whose image side surface is convex; and a fifth lens having negative focal power, whose object side surface is concave and whose image side surface is concave near the optical axis. The optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens through a specific surface shape setting and reasonable optical power distribution, so that the lens has one or more advantages such as short total length, low distortion, high pixel density, and no spacer.

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, mobile phones, tablets, and smartwatches are placing higher demands on camera miniaturization and high-pixel performance. Furthermore, traditional camera designs often include spacer structures, which limits the product's slimming and lightness, while also increasing the complexity and cost of production and assembly. Summary of the Invention

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

[0004] The technical solution adopted in the present invention is:

[0005] An optical lens, comprising five lenses, including the following elements in order from the object side to the imaging surface along the optical axis:

[0006] The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave;

[0007] a second lens having positive optical power;

[0008] a third lens element having positive optical power, whose object-side surface is concave and whose image-side surface is convex;

[0009] a fourth lens element having positive refractive power, whose object-side surface is concave and whose image-side surface is convex;

[0010] The fifth lens element has a negative optical power, the object side surface of which is concave, and the image side surface of which is concave near the optical axis;

[0011] Among them, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: ET12<0.15mm; ET23<0.15mm; ET34<0.15mm; ET45<0.15mm.

[0012] Further preferably, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: 0.1mm < ET12 < 0.15mm; 0.05mm < ET23 < 0.1mm; 0.04mm < ET34 < 0.06mm; 0.05mm < ET45 < 0.1mm.

[0013] Further preferably, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5 < CT2 / CT3 < 0.65.

[0014] Further preferably, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1 < TTL / f < 1.5; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.4 < TTL / IH < 0.8; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.1.

[0015] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 20 < f2 / f < 35; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -3 < R3 / R4 < 6.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 < f5 / f < -0.4; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -0.3 < (R9 + R10) / (R9 - R10) < -0.2.

[0017] Further preferably, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis respectively satisfy: 0.55 < ∑CT / TTL < 0.65.

[0018] Further preferably, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM5 of the image side surface of the fifth lens satisfy: 0.3 < DM11 / DM52 < 0.35.

[0019] Further preferably, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: 25 < f2 / f3 < 35; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0 < f3 / f4 < 0.5.

[0020] Further preferably, the distance d23 between the second lens and the third lens on the optical axis, the distance d34 between the third lens and the fourth lens on the optical axis, and the total optical length TTL of the optical lens satisfy: 0<(d23+d34) / TTL<0.1.

[0021] Compared with the existing technology, the optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens through a specific surface shape setting and reasonable optical focal length distribution, so that the lens has one or more advantages such as short total length, low distortion, high pixels, and no spacer. BRIEF DESCRIPTION OF THE DRAWINGS

[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 with reference to the following drawings, in which:

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

[0024] Figure 2 4 is an astigmatism curve diagram of the optical lens in Example 1 of the present invention.

[0025] Figure 3 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 1 of the present invention.

[0026] Figure 4 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention.

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

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

[0029] Figure 7 Graph showing the astigmatism of the optical lens in Example 2 of the present invention.

[0030] Figure 8 FIG. 4 is a graph showing the F-Tan (Theta) distortion curve of the optical lens in Example 2 of the present invention.

[0031] Figure 9 2 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention.

[0032] Figure 10 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

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

[0034] Figure 12 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0035] Figure 13 Graph showing the F-Tan (Theta) distortion of the optical lens in Example 3 of the present invention.

[0036] Figure 14 4 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention.

[0037] Figure 15 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0038] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The optical lens provided in the embodiment of the present invention comprises five lenses, which are arranged 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.

[0047] 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 concave or convex, and its image-side surface being concave or convex. The third lens may have positive optical power, with its object-side surface being concave and its image-side surface being 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 negative optical power, with its object-side surface being concave and its image-side surface being concave near the optical axis.

[0048] 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.

[0049] In some embodiments, the optical lens may further include a filter 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.

[0050] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: ET12 < 0.15 mm; ET23 < 0.15 mm; ET34 < 0.15 mm; ET45 < 0.15 mm. Meeting the above conditions, the edge gaps of the lenses are all less than 0.15 mm, which can achieve a structure without spacer rings, making the camera module more compact and conforming to the development of current increasingly miniaturized mobile devices.

[0051] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: 0.1 mm < ET12 < 0.15 mm; 0.05 mm < ET23 < 0.1 mm; 0.04 mm < ET34 < 0.06 mm; 0.05 mm < ET45 < 0.1 mm. Meeting the above conditions, on the premise of making the camera module more compact, it is also convenient for the production and assembly of the lenses.

[0052] In some embodiments, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5 < CT2 / CT3 < 0.65. Meeting the above conditions, by reasonably configuring the central thickness CT2 of the second lens and the central thickness CT3 of the third lens, a reasonable layout of the second lens and the third lens of the imaging lens can be achieved, thereby realizing the compression of the lateral dimension of the lens and ensuring the ultra-thin characteristics and miniaturization of the imaging lens.

[0053] In some embodiments, the effective focal length f of the optical lens and the overall optical length TTL of the optical lens satisfy: 1 < TTL / f < 1.5. Meeting the above conditions, the length of the lens can be effectively restricted, which is beneficial to the miniaturization of the optical lens.

[0054] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.4 < TTL / IH < 0.8. Meeting the above conditions, the miniaturization of the lens can be better achieved. At the same time, when ensuring the same overall length of the lens, it has a larger image plane and can match a larger-sized imaging chip to achieve high-definition imaging.

[0055] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 20 < f2 / f < 35. Meeting the above conditions, by reasonably setting the focal length of the second lens, it is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0056] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -3 < R3 / R4 < 6. Meeting the above conditions, by reasonably setting the surface shape of the second lens, it is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 < f5 / f < -0.4. Meeting the above conditions, by setting the fifth lens to have a large negative optical power, the incident light can be diverged to a large extent, causing the peripheral light and the central light to turn upwards, reaching a higher imaging position, better achieving large target surface imaging of the lens, and improving the imaging quality.

[0058] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.3 < (R9 + R10) / (R9 - R10) < -0.2. Meeting the above conditions, the surface shape of the fifth lens can be controlled, reducing the incident angle of light on the fifth lens, and at the same time facilitating the processing of the lens.

[0059] In some embodiments, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis satisfy: 0.55 < ∑CT / TTL < 0.65. Meeting the above conditions, the overall length of the optical lens can be effectively compressed, while being beneficial to the structural design and production process of the optical lens.

[0060] In some embodiments, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM52 of the image side surface of the fifth lens satisfy: 0.3 < DM11 / DM52 < 0.35. Meeting the above conditions, by reasonably setting the ratio of the apertures of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, better meeting the balance of miniaturization and high pixels.

[0061] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0 < f1 / f2 < 0.1. Meeting the above conditions, by reasonably setting the focal length ratio of the first lens and the second lens, the incident light can be quickly converged after passing through the first lens, thereby shortening the system length, being beneficial to reducing the lens size; and the second lens can smoothly transition the incident light, facilitating the correction of astigmatism and field curvature.

[0062] In some embodiments, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: 25 < f2 / f3 < 35; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0 < f3 / f4 < 0.5. By satisfying the above conditions and reasonably setting the focal length ratios of the second, third, and fourth lenses, the system length can be shortened, and the aberration and distortion of the marginal field of view can be reduced, so that the lens has less distortion and can provide a high-definition imaging effect.

[0063] In some embodiments, the spacing distance d23 between the second lens and the third lens on the optical axis, the spacing distance d34 between the third lens and the fourth lens on the optical axis, and the total optical length TTL of the optical lens satisfy: 0 < (d23 + d34) / TTL < 0.1. By satisfying the above conditions, it is ensured that the spacing between the second, third, and fourth lenses is not too large, thereby controlling the lens length. On the basis of meeting the miniaturization of the optical lens, the energy level of the ghost image reflected between the lenses is reduced, achieving miniaturization and weak ghost images.

[0064] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2 < IH / f < 2.1. By satisfying the above conditions, a larger field angle and imaging range can be achieved on the premise of a short focal length, and the large image plane characteristic can be realized while ensuring clear imaging, thereby improving the imaging quality of the optical system.

[0065] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < f3 / f < 1.2; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.5 < f4 / f < 4. By satisfying the above conditions, the third and fourth lenses further converge the incident light rays at the front end, which is beneficial to correcting the aberration and distortion of the marginal field of view brought by the front lens group, so that the lens has less distortion and can provide a high-definition imaging effect.

[0066] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -2.4 < f1 / f5 < -2. By satisfying the above conditions and reasonably setting the focal length ratio of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance between miniaturization and high pixel counts.

[0067] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 2.2 mm < IH / Fno < 2.9 mm. By satisfying the above conditions, the lens can better achieve the balance between large target surface imaging and large aperture performance, the pixel distribution can be sparser (i.e., the pixel point size is larger), the noise can be reduced in a darker environment, the dynamic range will be wider, and more details can be retained in the dark part, thereby improving the image quality.

[0068] 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: 4.2 < IH / EPD < 4.9. Meeting the above range enables the optical lens to satisfy the image plane height while also ensuring sufficient image plane brightness in the edge field of view, preventing vignetting, and thus improving the imaging quality.

[0069] 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: 0.96 < (2f × tan(FOV / 2)) / IH < 1. Meeting the above conditions can make the lens have a small distortion value and provide a high-definition imaging effect.

[0070] In some embodiments, the combined focal length f13 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy: 0.55 < f13 / f < 0.65. Meeting the above conditions can effectively control the combined focal length of the first lens to the third lens, making the refractive power intensity at the object side end of the optical imaging system sufficient, facilitating the effective convergence of large-angle light rays, being conducive to the wide-angleization of the optical imaging system, and improving the imaging quality of the optical imaging system.

[0071] In some embodiments, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -0.65 < f45 / f < -0.5. Meeting the above conditions, by reasonably controlling the ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the optical lens, it is beneficial to control the angle of the incident light rays of the light beam exiting the optical lens to reduce the aberration generated by the optical lens.

[0072] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, the edge spacing distance ET45 between the fourth lens and the fifth lens, and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis satisfy: 0.1 < (ET12 + ET23 + ET34 + ET45) / ∑CT < 0.2. Meeting the above conditions can make the optical lens more compact.

[0073] In some embodiments, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, the edge spacing distance ET45 between the fourth lens and the fifth lens, and the sum ∑ET of the edge thicknesses of the first lens to the fifth lens satisfy: 0.18 < (ET12 + ET23 + ET34 + ET45) / ∑ET < 0.22. Meeting the above conditions can further define the edge spacing of the lenses, making the optical lens more compact.

[0074] In some embodiments, the optical lens satisfies the conditional formula: 2.5 mm < f < 3 mm, 3.2 mm < TTL < 3.7 mm, 88° < FOV < 93°, where f represents the effective focal length of the optical lens, TTL represents the total optical length of the optical lens, and FOV represents the maximum field angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least a smaller total optical length, features of short focal length and wide angle. The depth of field of a short focal length lens is relatively deep, and both the front and back of the subject can remain relatively clear, achieving characteristics such as high-definition imaging.

[0075] 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 makes the structure of the lens relatively compact, and can better achieve the balance of miniaturization and high image quality of the lens.

[0076] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving the miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens of the present invention can all adopt aspherical lenses.

[0077] In each embodiment of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0078] ;

[0079] where z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, F, G, H are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order respectively.

[0080] 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.

[0081] Example 1

[0082] 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.

[0083] The first lens L1 has positive refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0084] The second lens L2 has positive refractive power, its object-side surface S3 is convex at the near optical axis, and its image-side surface S4 is concave at the near optical axis;

[0085] The third lens L3 has positive refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0086] The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0087] The fifth lens L5 has negative refractive power, its object-side surface S9 is concave, and its image-side surface S10 is concave near the optical axis;

[0088] The object-side surface S11 and the image-side surface S12 of the filter G1 are both flat surfaces;

[0089] The imaging surface S13 is a plane.

[0090] 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.

[0091] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0092] Table 1-1

[0093]

[0094] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0095] Table 1-2

[0096]

[0097] In this embodiment, the astigmatism curve, F-Tan (Theta) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0098] Figure 2 The astigmatism curve of Example 1 is shown, which shows the astigmatism of light in the meridional image plane and the sagittal image plane. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the astigmatism of the meridional image plane and the sagittal image plane is controlled within -0.1mm to 0.15mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0099] Figure 3 The following graph shows the F-Tan (Theta) distortion curve for Example 1, which represents the F-Tan (Theta) distortion at different image heights on the imaging plane. The horizontal axis represents the F-Tan (Theta) distortion value (unit: %), and the vertical axis represents the half field of view angle (unit: °). As can be seen from the graph, the F-Tan (Theta) distortion of the optical lens 100 is controlled within ±1%, indicating that the distortion of the optical lens 100 is well corrected.

[0100] Figure 4 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 a range of -0.04mm to 0.02mm, indicating that the optical lens 100 is capable of correcting axial aberration well.

[0101] Figure 5 A vertical chromatic aberration curve for Example 1 is shown. It plots the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. 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 field of view angle. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±1.5 μm, demonstrating that the optical lens 100 is capable of excellently correcting chromatic aberration across all viewing fields.

[0102] Example 2

[0103] See also Figure 6 , 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 image-side surface S4 of the second lens L2 is convex at the near optical axis; and 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 200 in Example 2 are shown in Table 2-1.

[0105] Table 2-1

[0106]

[0107] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0108] Table 2-2

[0109]

[0110] In this embodiment, the astigmatism curve, F-Tan (Theta) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 200 are shown as follows: Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 shown.

[0111] from Figure 7 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can correct the astigmatism well.

[0112] from Figure 8 It can be seen from the figure that the F-Tan (Theta) distortion of the optical lens 200 is controlled within ±1%, indicating that the distortion of the optical lens 200 is well corrected.

[0113] from Figure 9 It can be seen from the figure that the offset of the axial aberration is controlled within -0.03mm~0.02mm, which shows that the optical lens 200 can correct the axial aberration well.

[0114] from Figure 10 As can be seen from the figure, the vertical axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 200 can excellently correct the chromatic aberration of each field of view.

[0115] Example 3

[0116] See also Figure 11, shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S3 of the second lens L2 is concave; the image-side surface S4 of the second lens L2 is convex near the optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0117] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0118] Table 3-1

[0119]

[0120] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0121] Table 3-2

[0122]

[0123] In this embodiment, the astigmatism curve, F-Tan (Theta) distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are shown as follows: Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 shown.

[0124] from Figure 12 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the astigmatism well.

[0125] from Figure 13 It can be seen from the figure that the F-Tan (Theta) distortion of the optical lens 300 is controlled within ±1.5%, indicating that the distortion of the optical lens 300 is well corrected.

[0126] from Figure 14 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0127] from Figure 15 As can be seen from the figure, the vertical axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5μm, indicating that the optical lens 300 can excellently correct the chromatic aberration of each field of view.

[0128] Please refer to Table 4, 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.

[0129] Table 4

[0130]

[0131] In summary of the above embodiments, the optical lens provided by the present invention has at least the following advantages:

[0132] (1) Through specific surface shape settings and reasonable optical focal length distribution, the length of the optical lens can be effectively limited, making the lens have a short total length. At the same time, the edge gap of the lens is less than 0.15mm, which can achieve a spacer-free structure and make the camera module more compact, which is in line with the development of increasingly miniaturized mobile devices.

[0133] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens. The overall lens aberration is small, and it has the characteristics of small distortion and high pixel, thereby improving the imaging quality of the optical lens.

[0134] 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.

[0135] 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, comprising five lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a positive optical power, whose object side surface is convex and whose image side surface is concave; A second lens with a positive optical power; A third lens with a positive optical power, whose object side surface is concave and whose image side surface is convex; A fourth lens with a positive optical power, whose object side surface is concave and whose image side surface is convex; A fifth lens with a negative optical power, whose object side surface is concave and whose image side surface is concave near the optical axis; Among them, the edge spacing distance ET12 between the first lens and the second lens, the edge spacing distance ET23 between the second lens and the third lens, the edge spacing distance ET34 between the third lens and the fourth lens, and the edge spacing distance ET45 between the fourth lens and the fifth lens satisfy: 0.1mm < ET12 < 0.15mm; 0.05mm < ET23 < 0.1mm; 0.04mm < ET34 < 0.06mm; 0.05mm < ET45 < 0.1mm; 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: 5.714mm ≤ IH ≤ 5.826mm and 4.2 < IH / EPD < 4.9; The aperture value Fno of the optical lens satisfies: 2.2 ≤ Fno ≤ 2.

3.

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

65.

3. 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 < TTL / f < 1.5; The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.4 < TTL / IH < 0.

8.

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

5. 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: -0.6 < f5 / f < -0.4; The curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -0.3 < (R9 + R10) / (R9 - R10) < -0.

2.

6. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis respectively satisfy: 0.55 < ∑CT / TTL < 0.

65.

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

35.

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

5.

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

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