Optical lens

Abstract

The application provides an optical lens which is composed of five lenses and sequentially comprises, along an optical axis from an object side to an imaging surface: a first lens with positive focal 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 focal 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 focal power, the object side of which is a concave surface and the image side of which is a convex surface; a fourth lens with positive focal 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 focal 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 effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy 1.1 < TTL / f < 1.3. The optical lens provided by the application has the advantages of super-thin small head size, small total length, guarantee of the miniaturization of the head size of the lens and balance of the large field of view, reasonable correction of the overall aberration of the optical lens and improvement of the imaging quality of the optical lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] With the rapid development of mobile communication and imaging technology, learning machines, mobile phones, tablet computers, telephone watches and other portable mobile devices have higher requirements for the miniaturization and high-pixel performance of cameras. However, most of the high-pixel wide-angle lenses on the market have a large total length. How to reduce the weight of the lens while meeting the high-pixel imaging requirement, so that the optical system meets the miniaturization requirement is a problem to be solved at present. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as short total length, high pixel, excellent imaging quality, etc.

[0004] The technical scheme adopted by the present application is:

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

[0006] The first lens has positive focal power, the object side surface is convex, and the image side surface is concave;

[0007] The second lens has positive focal power, the object side surface is convex, and the image side surface is concave;

[0008] The third lens has positive focal power, the object side surface is concave, and the image side surface is convex;

[0009] The fourth lens has positive focal power, the object side surface is concave, and the image side surface is convex;

[0010] The fifth lens has positive focal power, the object side surface is convex near the optical axis, and the image side surface is concave near the optical axis;

[0011] 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 < 1.3.

[0012] 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 FOV of the optical lens satisfy: 40° < (f x FOV) / IH < 48°.

[0013] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 0.55 < TTL / IH < 0.65.

[0014] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 35° < FOV / Fno < 40°.

[0015] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 35° < FOV / Fno < 40°.

[0016] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 35° < FOV / Fno < 40°.

[0017] It is further preferred that an effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: 30 < f1 / f < 45.

[0018] It is further preferred that an effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: 550 < f3 / f < 800.

[0019] It is further preferred that an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 320 < f5 / f < 600.

[0020] It is further preferred that an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 320 < f5 / f < 600.

[0021] Compared with the prior art, the optical lens provided by the present application has an ultra-thin small head size and a small total length, can realize a large field of view of the lens, and ensures the balance between the small head size and the large field of view. In addition, the optical lens of the present application can also reasonably correct the overall aberration of the optical lens, so that the optical lens has high pixels and improves the imaging quality of the optical lens. BRIEF DESCRIPTION OF DRAWINGS

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

[0023] Figure 1 FIG. 1 is a structure diagram of an optical lens according to an embodiment of the present application.

[0024] Figure 2 FIG. 3 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.

[0025] Figure 3 FIG. 5 is an F-Tan(θ) distortion curve diagram of the optical lens according to the embodiment of the present application.

[0026] Figure 4 The vertical axis chromatic aberration curve of the optical lens in the embodiment 1 of the present application.

[0027] Figure 5 The axial aberration curve of the optical lens in the embodiment 1 of the present application.

[0028] Figure 6 The relative illumination curve of the optical lens in the embodiment 1 of the present application.

[0029] Figure 7 The structure schematic diagram of the optical lens in the embodiment 2 of the present application.

[0030] Figure 8 The field curvature curve of the optical lens in the embodiment 2 of the present application.

[0031] Figure 9 The F-Tan(θ) distortion curve of the optical lens in the embodiment 2 of the present application.

[0032] Figure 10 The vertical axis chromatic aberration curve of the optical lens in the embodiment 2 of the present application.

[0033] Figure 11 The axial aberration curve of the optical lens in the embodiment 2 of the present application.

[0034] Figure 12 The relative illumination curve of the optical lens in the embodiment 2 of the present application.

[0035] Figure 13 The structure schematic diagram of the optical lens in the embodiment 3 of the present application.

[0036] Figure 14 The field curvature curve of the optical lens in the embodiment 3 of the present application.

[0037] Figure 15 The F-Tan(θ) distortion curve of the optical lens in the embodiment 3 of the present application.

[0038] Figure 16 The vertical axis chromatic aberration curve of the optical lens in the embodiment 3 of the present application.

[0039] Figure 17 The axial aberration curve of the optical lens in the embodiment 3 of the present application.

[0040] Figure 18 The relative illumination curve of the optical lens in the embodiment 3 of the present application.

[0041] Figure 19 The structure schematic diagram of the optical lens in the embodiment 4 of the present application.

[0042] Figure 20A field curvature curve of the optical lens in Embodiment 4 of the present application.

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

[0044] Figure 22 A sagittal chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0045] Figure 23 An axial chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0046] Figure 24 A relative illumination curve of the optical lens in Embodiment 4 of the present application.

[0047] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0048] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0050] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0051] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0052] It should also be understood that the words "comprise," "comprising," "include," "including," and / or "has," "having," when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when terms such as "at least one of," "one or more of," or "one or more" are used in this specification, these terms are intended to mean that the list of features, elements, and / or components followed by these terms is intended to be inclusive of one, more than one, or all of the listed features, elements, and / or components, and any combination thereof. Furthermore, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application." Also, the use of the term "example" is intended to mean an example or illustration.

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

[0054] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0055] The optical lens provided by the embodiments of the present application is composed of five lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

[0056] In some embodiments, the first lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The second lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface. The third lens can have a positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The fourth lens can have a positive focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The fifth lens can have a positive focal power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface at the near optical axis.

[0057] In some embodiments, the optical lens can further include a diaphragm, which can be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging.

[0058] In some embodiments, the optical lens can further include a filter, which can be arranged between the fifth lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0059] In some embodiments, the effective focal length f of the optical lens and the total track length TTL of the optical lens satisfy: 1.1 < TTL / f < 1.3. Satisfying the above condition, the length of the lens can be effectively limited, which is conducive to the miniaturization of the optical lens.

[0060] In some embodiments, 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 x FOV) / IH < 48°. Satisfying the above condition, by reasonably limiting the relationship among the focal length, the field of view, and the image height of the optical lens, the balance between the large field of view and the large target surface imaging of the optical lens is achieved, and the use requirements of the electronic device camera are better met.

[0061] In some embodiments, the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.55 < TTL / IH < 0.65. Satisfying the above condition, the miniaturization of the lens can be better achieved, and at the same total length, the lens has a larger image surface, which can match a larger imaging chip to achieve high-definition imaging.

[0062] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 35° < FOV / Fno < 40°. Satisfying the above condition is conducive to improving the light intake of the lens, so that the lens can also achieve high-definition imaging in a dim environment.

[0063] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.5 < IH / EPD < 5.5. Satisfying the above range makes the optical lens meet the large image surface while also meeting the sufficient image surface brightness of the edge field of view, preventing the occurrence of dark corner phenomenon, thereby improving the imaging quality.

[0064] In some embodiments, the back focal length BFL of the optical lens and the total track length TTL of the optical lens satisfy: 0.35 < BFL / TTL < 0.4. Satisfying the above condition is conducive to the short back focus of the optical lens by reasonably configuring the ratio of the back focal length of the optical lens to the total track length of the optical lens, which is conducive to the miniaturization of the optical lens while ensuring sufficient space for optical element installation and focusing.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 30 < f1 / f < 45. Satisfying the above condition, the first lens converges light and preliminarily corrects spherical aberration and coma, balancing light convergence and aberration control.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 550 < f3 / f < 800. Satisfying the above condition, the third lens can fine-tune the chief ray angle, control the uniformity of the image plane illumination, and balance high-order aberrations (such as distortion and lateral chromatic aberration).

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 320 < f5 / f < 600. Satisfying the above condition, the fifth lens cooperates with the fourth lens to correct the image plane 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, thereby improving the imaging quality of the optical lens.

[0068] In some embodiments, the object side curvature radius R1 of the first lens and the image side curvature radius R2 of the first lens satisfy: 1 < R1 / R2 < 1.2. Satisfying the above condition, the surface shape of the first lens can be reasonably set, and the light collecting ability of the first lens can be enhanced, thereby realizing a large field of view angle.

[0069] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < IH / f < 2.2. Satisfying the above condition, a larger field of view angle and imaging range can be realized, the large image plane characteristic can be realized while ensuring the depth of field of the optical lens, and thus the imaging quality of the optical system is improved.

[0070] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1 < f2 / f < 1.2. Satisfying the above condition, the second lens greatly converges light to shorten the total length of the system and compensate for the aberrations generated by the front group.

[0071] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 6.5 < f4 / f < 9.5. Satisfying the above condition, the fourth lens can converge the incident light at the front end, which is conducive to correcting the aberrations and the distortion of the edge field brought by the front lens group, so that the lens has smaller distortion and can provide high-definition imaging effect.

[0072] In some embodiments, the maximum field of view angle FOV of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 14° / mm < FOV / IH < 17° / mm. Satisfying the above condition, the optical lens has the large field of view characteristic under the premise of meeting the image height requirement, so that the optical lens has good optical performance and can well capture the details of the object.

[0073] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.4 < BFL / f < 0.5. Satisfying the above range, a balance between good imaging quality and easy assembly of the optical back focal length is achieved, the imaging quality of the optical lens is ensured, interference between the lens and other elements is avoided, and the assembly process difficulty of the camera module is reduced.

[0074] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: 0.05 < f1 / f5 < 0.2. Satisfying the above condition, by reasonably setting the focal length relationship of the first and last lenses in the lens, the area of the light entering the imaging surface is increased while ensuring as much light as possible to enter the system, which is conducive to realizing large image surface imaging of the lens, and increasing the light amount, and improving the relative luminance of the system.

[0075] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.1 < f12 / f45 < 0.25. Satisfying the above range, the light power ratio of the front and rear lens groups can be reasonably distributed, the relative luminance of the lens is increased, and the imaging quality of the lens is improved.

[0076] In some embodiments, the distance CT12 of the first lens and the second lens on the optical axis, the distance CT23 of the second lens and the third lens on the optical axis, the distance CT34 of the third lens and the fourth lens on the optical axis, and the center thickness CT3 of the third lens satisfy: 2.3 < (CT12+CT23+CT34) / CT3 < 2.8. Satisfying the above condition, the gap between the first lens, the second lens, the third lens and the fourth lens and the size of the center thickness of the third lens are reasonably arranged, which is conducive to realizing the miniaturization feature of the system.

[0077] In some embodiments, the center thickness CT2 of the second lens and the edge thickness CT2 of the second lens satisfy: 1.2 < CT2 / ET2 < 1.6. By making the optical system satisfy the above relationship, the lens processing and molding are facilitated, the assembly difficulty is reduced, and the field curvature of the system can be effectively corrected.

[0078] In some embodiments, the object side light half aperture radius DM11 of the first lens and the image side light half aperture radius DM52 of the fifth lens satisfy: 0.25 < DM11 / DM52 < 0.35. Satisfying the above condition, while ensuring that the light enters the system in a large range, the aperture size of the lens is effectively reduced, which is conducive to realizing the balance of the field of view and the aperture of the lens.

[0079] In some embodiments, the optical lens satisfies the condition formula: 2.6mm < f < 3mm, 85° < FOV < 95°, 3mm < TTL < 3.8mm, 5.5mm < IH < 6.5mm, 2.2 < Fno < 2.6; wherein f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, TTL represents an optical total length of the optical lens, IH represents a real image height corresponding to the maximum field of view angle of the optical lens, and Fno represents an aperture value of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiments of the present application at least: has a short total length, realizes miniaturization of the lens; has a short-focus feature, the depth of field of the short-focus lens is relatively deep, and the subject can remain relatively clear in front and back; has a relatively large field of view angle, provides a wider shooting field of view for the front-view lens and other application scenarios of the electronic device, and takes more image information; has a relatively large imaging surface, and can match a larger size chip to realize high-definition imaging; and has a large aperture, and can realize high-definition imaging even in a complex light environment.

[0080] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass. The optical lens provided by the present application can adopt a full-plastic lens structure, which not only has excellent imaging performance, but also has a relatively compact structure, and can better realize the balance between miniaturization and high image quality of the lens.

[0081] In some embodiments, the first lens, the second lens, the third lens, the fourth lens and the fifth lens can adopt a spherical lens or an aspherical lens. 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 application can all adopt an aspherical lens, 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.

[0082] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0083] ;

[0084] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, 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 quadratic surface coefficient, and B, C, D, E, F, G and H are respectively the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order and sixteenth-order surface coefficients.

[0085] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0086] Embodiment 1

[0087] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, which includes, along the optical axis from the object side to the imaging surface, a diaphragm 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.

[0088] The first lens L1 has positive focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0089] The second lens L2 has positive focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.

[0090] The third lens L3 has positive focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface.

[0091] The fourth lens L4 has positive focal power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface.

[0092] The fifth lens L5 has positive focal power, the object side surface S9 is a convex surface near the optical axis, and the image side surface S10 is a concave surface near the optical axis.

[0093] The object side surface S11 and the image side surface S12 of the filter G1 are both flat surfaces.

[0094] The imaging surface S13 is a flat surface.

[0095] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 all adopt plastic aspheric lenses.

[0096] The related parameters of each lens in the optical lens 100 in the embodiment 1 are shown in Table 1-1.

[0097] Table 1-1

[0098]

[0099] The surface type parameters of the aspheric lenses of the optical lens 100 in the embodiment 1 are shown in Table 1-2.

[0100] Table 1-2

[0101]

[0102] In this embodiment, the field curvature curve, the F-Tan(0) distortion curve, the lateral chromatic aberration curve, the axial aberration curve, and the relative illumination curve of the optical lens 100 are shown in FIGS. 1-2A, 1-2B, 1-2C, 1-2D, and 1-2E, respectively. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6

[0103] Figure 2 The field curvature curve of Example 1 is shown, which represents the curvature of light rays on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.2 mm~0.1 mm, which shows that the optical lens 100 can well correct the field curvature.

[0104] Figure 3 The F-Tan(0) distortion curve of Example 1 is shown, which represents the F-Tan(0) distortion at different field angles on the imaging surface, the horizontal axis represents the F-Tan(0) distortion value (unit: %), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the F-Tan(0) distortion of the optical lens 100 is controlled within 0~2.5%, which shows that the distortion of the optical lens 100 is well corrected.

[0105] Figure 4 The lateral chromatic aberration curve of Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different field angles on the imaging surface, the horizontal axis represents the lateral chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the lateral chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which shows that the optical lens 100 can very well correct the chromatic aberration of each field.

[0106] Figure 5 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.05 mm, which shows that the optical lens 100 can better correct the axial aberration.

[0107] Figure 6 ​The relative luminance curve of the embodiment 1 is shown, which represents the relative luminance values at different field angles on the imaging plane, the horizontal axis represents the field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is greater than 20%, which indicates that the optical lens 100 has good relative luminance.

[0108] Embodiment 2

[0109] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0110] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.

[0111] Table 2-1

[0112]

[0113] The surface type parameters of the aspherical lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.

[0114] Table 2-2

[0115]

[0116] In this embodiment, the field curvature curve, the F-Tan(θ) distortion curve, the vertical color aberration curve, the axial aberration curve and the relative luminance curve of the optical lens 200 are shown in Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 respectively.

[0117] As can be seen from Figure 8 , the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.2mm~0.1mm, which indicates that the optical lens 200 can well correct the field curvature.

[0118] As can be seen from Figure 9 , the F-Tan(θ) distortion of the optical lens 200 is controlled within 0~2.5%, which indicates that the distortion of the optical lens 200 is well corrected.

[0119] As can be seen from Figure 10 , the vertical color aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, which indicates that the optical lens 200 can very well correct the color aberration of each field of view.

[0120] As can be seen from Figure 11It can be seen from the axial aberration in Table 3-1 that the shift of the axial aberration is controlled within -0.04mm~0.05mm, which indicates that the optical lens 200 can correct the axial aberration well.

[0121] From Figure 12 It can be seen from the relative illumination value of the optical lens that the relative illumination value is greater than 20%, which indicates that the optical lens 200 has good relative illumination.

[0122] Embodiment 3

[0123] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0124] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127] The surface type parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130] In this embodiment, the field curvature curve, the F-Tan(θ) distortion curve, the axial color aberration curve, the axial aberration curve and the relative illumination curve of the optical lens 300 are shown in Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 respectively.

[0131] From Figure 14 It can be seen from the field curvature of the meridional image surface and the sagittal image surface that the field curvature is controlled within ±0.1mm, which indicates that the optical lens 300 can correct the field curvature well.

[0132] From Figure 15 It can be seen from the F-Tan(θ) distortion of the optical lens 300 that the F-Tan(θ) distortion is controlled within 0~2.5%, which indicates that the distortion of the optical lens 300 is well corrected.

[0133] From Figure 16 It can be seen from the axial color aberration of the longest wavelength and the shortest wavelength that the axial color aberration is controlled within ±2μm, which indicates that the optical lens 300 can correct the color aberration of each field of view very well.

[0134] FromFigure 17 As can be seen from

[0135] From Figure 18 As can be seen from

[0136] Embodiment 4

[0137] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens 400 provided in the embodiment 4 of the present application. Compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0138] The related parameters of each lens in the optical lens 400 in the embodiment 4 are shown in Table 4-1.

[0139] Table 4-1

[0140]

[0141] The surface type parameters of the aspherical lens of the optical lens in the embodiment 4 are shown in Table 4-2.

[0142] Table 4-2

[0143]

[0144] In the embodiment, the field curvature curve, the F-Tan(θ) distortion curve, the axial chromatic aberration curve, the axial aberration curve and the relative illumination curve of the optical lens 400 are respectively shown in Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24

[0145] As can be seen from Figure 20 As can be seen from

[0146] As can be seen from Figure 21 As can be seen from

[0147] As can be seen from Figure 22 As can be seen from

[0148] 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.

[0149] 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.

[0150] 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.

[0151] Table 5

[0152]

[0153] In summary, the optical lens provided by the present invention has at least the following advantages:

[0154] (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.

[0155] (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.

[0156] 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.

[0157] 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 has a concave object side and a convex image side. 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 effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.1 <TTL / f<1.3。 2. 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°.

3. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.55 <TTL / IH<0.65。 4. The optical lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical lens and the aperture value (Fno) of the optical lens satisfy: 35° <FOV / Fno<40°。 5. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.5 <IH / EPD<5.5。 6. 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: 0.35 <BFL / TTL<0.4。 7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 30 <f1 / f<45。 8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 550 <f3 / f<800。 9. 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: 320 <f5 / f<600。 10. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: 1 <R1 / R2<1.2。

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