Optical lens
By designing a six-lens optical lens and using a combination of lenses with specific optical power and surface shape, the problem of insufficient large aperture and large image plane in mobile phone lenses at a full field of view of 63° was solved, achieving high-quality imaging effects and rich scene capture capabilities.
Patent Information
- Application Number
- CN202411983672.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2044-12-31
AI Technical Summary
The mobile phone lenses on the market lack a main camera lens with a full field of view of 63°, which makes it difficult to meet consumers' demand for large aperture and large image size, especially in terms of insufficient image quality when shooting at night.
A six-lens optical lens was designed, employing a combination of lenses with specific optical power and surface shape, including lenses with positive and negative optical power. Through reasonable allocation of optical power and setting of surface shape, large aperture and telephoto characteristics are achieved.
It achieves high-quality imaging with a large aperture, enhances imaging performance in low-light conditions, and possesses rich scene capture capabilities, providing more vivid image representation. At the same time, it controls optical distortion and chromatic aberration, improving resolution.
Smart Images
Figure CN119717208B_ABST
Abstract
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 continuous upgrading of smart phones, consumers have increasingly high requirements for the shooting function of the phone. The 35mm focal length (i.e. the full field of view angle is 63°) is considered to be the classic focal length of human photography, which is easier to highlight the main body compared with the 24mm focal length; compared with the 50mm focal length, it has a larger shooting angle and a wider range of application scenarios. The lens with the 35mm focal length can provide rich scene capturing ability for photographers due to its relatively large angle of view, and is particularly suitable for shooting full-body portraits; when shooting portraits, the main body of the person can be naturally integrated into the surrounding environment, and a more lively and story-telling picture can be presented.
[0003] However, few mobile phones on the market are equipped with a main camera lens with a full field of view angle of 63°. Part of the reason is that it is more difficult to make the aperture larger and the image height larger for a lens with this focal length compared with a lens with a 24mm focal length, which cannot meet the use requirements of consumers. SUMMARY
[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.
[0005] The technical scheme adopted by the present application is:
[0006] An optical lens, which comprises six lenses in sequence along the optical axis from the object side to the imaging surface, comprising:
[0007] a first lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;
[0008] a second lens with positive refractive power, the object side surface of which is a convex surface near the optical axis, and the image side surface of which is a concave surface near the optical axis;
[0009] a third lens with positive refractive power, both the object side surface and the image side surface of which are convex surfaces;
[0010] a fourth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface;
[0011] a fifth lens with negative refractive power, the object side surface of which is a convex surface near the optical axis, and the image side surface of which is a concave surface near the optical axis;
[0012] a sixth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface near the optical axis;
[0013] wherein the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -25 < f5 / f < -3.
[0014] Further preferably, the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.15 < TTL / f < 1.25; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.9 < TTL / IH < 0.95; the effective focal length f, the maximum field of view angle FOV and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1 < (IH / 2) / (f x tan(FOV / 2)) < 1.02.
[0015] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 2 < f1 / f < 2.4; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.4 < f6 / f < -1.
[0016] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 30 < f2 / f < 56; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.25 < R3 / f < 0.4; the curvature radius R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.25 < R4 / f < 0.4.
[0017] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 1; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < R5 / f < 0.8; the curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: -2 < R6 / f < -0.8.
[0018] Further preferably, the combined focal length f23 of the second lens and the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f23 / f < 1.1; the combined focal length f23 of the second lens and the third lens and the focal length f4 of the fourth lens satisfy: -0.2 < f23 / f4 < -0.05.
[0019] Further preferably, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: 0.3 < f4 / f5 < 1.5; the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -8.1 < (R8-R9) / (R8+R9) < -2.8; the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -0.8 < R8 / R9 < -0.4.
[0020] It is further preferred that the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 1.8; the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.7 < R10 / f < 1.3.
[0021] It is further preferred that 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: -0.9 < R5 / R6 < -0.3; 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: 1.1 < R9 / R10 < 1.9.
[0022] It is further preferred that 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: -0.5 < (R5+R6) / (R5-R6) < 0; 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: 3.3 < (R9+R10) / (R9-R10) < 16.7.
[0023] Compared with the prior art, the optical lens provided by the application adopts six lenses with specific optical powers, and through specific surface shape settings and reasonable optical power distribution, the lens can have the characteristics of long focal length, large image surface and large aperture. Long focal length helps to provide rich scene capturing capability for photographers and exhibit more vivid pictures, large image surface helps to improve the resolving power of the lens, and large aperture enables the lens to have excellent imaging quality in dark environments at night. BRIEF DESCRIPTION OF DRAWINGS
[0024] 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:
[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.
[0026] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.
[0027] Figure 3 FIG. 3 is an F-Tan(Theta) distortion curve of the optical lens according to the embodiment of the present application.
[0028] Figure 4 FIG. 4 is a curve of the lateral chromatic aberration of the optical lens according to the embodiment of the present application.
[0029] Figure 5 FIG. 5 is a relative luminance curve of the optical lens according to the embodiment of the present application.
[0030] Figure 6The structure diagram of the optical lens in the embodiment 2 of the present application.
[0031] Figure 7 The field curvature curve diagram of the optical lens in the embodiment 2 of the present application.
[0032] Figure 8 The F-Tan(Theta) distortion curve of the optical lens in the embodiment 2 of the present application.
[0033] Figure 9 The field curvature curve diagram of the optical lens in the embodiment 2 of the present application.
[0034] Figure 10 The relative illumination curve diagram of the optical lens in the embodiment 2 of the present application.
[0035] Figure 11 The structure diagram of the optical lens in the embodiment 3 of the present application.
[0036] Figure 12 The field curvature curve diagram of the optical lens in the embodiment 3 of the present application.
[0037] Figure 13 The F-Tan(Theta) distortion curve of the optical lens in the embodiment 3 of the present application.
[0038] Figure 14 The field curvature curve diagram of the optical lens in the embodiment 3 of the present application.
[0039] Figure 15 The relative illumination curve diagram of the optical lens in the embodiment 3 of the present application.
[0040] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION
[0041] 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 understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the description, 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.
[0042] It should be noted that, in the present specification, the expressions first, second, third and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, 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.
[0043] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease 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.
[0044] In this document, the paraxial region refers to a region near the optical axis. If the 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 the 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 imaging surface is referred to as the image side surface of the lens.
[0045] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, mean 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 describing the embodiments of the present application, the use of "may" means that one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.
[0046] 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 should also be understood that the terms 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.
[0047] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.
[0048] The optical lens provided by the embodiments of the present application comprises six lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface, i.e., the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens.
[0049] In some embodiments, the first lens can have positive refractive power, a convex object side surface, and a concave image side surface. The second lens can have positive refractive power, a convex object side surface at the near optical axis, and a concave image side surface at the near optical axis. The third lens can have positive refractive power, both the object side surface and the image side surface being convex. The fourth lens can have negative refractive power, a concave object side surface, and a convex image side surface. The fifth lens can have negative refractive power, a convex object side surface at the near optical axis, and a concave image side surface at the near optical axis. The sixth lens can have negative refractive power, a concave object side surface, and a concave image side surface at the near optical axis.
[0050] 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 can be used to limit the amount of light entering, so as to change the brightness of the imaging.
[0051] In some embodiments, the optical lens can further include a filter, which can be disposed between the sixth lens and the imaging surface. The filter is used to filter out interference light, so as to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.
[0052] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -25 < f5 / f < -3. This range helps to make the optical lens have a large image surface by reasonably limiting the proportion of the focal length of the fifth lens. More specifically, -24.1 < f5 / f < -3.33.
[0053] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.15 < TTL / f < 1.25; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.9 < TTL / IH < 0.95; the effective focal length f, the maximum field of view angle FOV, and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1 < (IH / 2) / (f x tan(FOV / 2)) < 1.02. Satisfying the above ranges, while taking into account good imaging quality, it is beneficial to shorten the total length of the optical lens, realize the miniaturization of the optical lens, meet the demand for miniaturization and large image surface in the mobile phone application scenario; the optical distortion of the optical lens is well controlled, so that the imaging of each field of view is clearer, and the resolving power of the optical lens is improved. More specifically, 1.17 < TTL / f < 1.21, and 0.9 < TTL / IH < 0.93.
[0054] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 2 < f1 / f < 2.4; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.4 < f6 / f < -1. The ranges satisfy the above conditions, so that the first lens has a proper positive refractive power, the sixth lens has a proper negative refractive power, the light path can be reasonably controlled in the front and rear parts of the optical lens respectively, the difficulty of aberration correction of the middle lenses can be reduced, and the imaging quality can be improved. More specifically, 2.02 < f1 / f < 2.33, and -1.33 < f6 / f < -1.04.
[0055] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 30 < f2 / f < 56; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.25 < R3 / f < 0.4; the curvature radius R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.25 < R4 / f < 0.4. The ranges satisfy the above conditions, so that the ratio of the focal length of the second lens and the shape of the object side surface and the image side surface of the second lens are reasonably limited, which helps to control the light entering the optical lens through the front end lens to have a reasonable deflection degree, and helps to correct the field curvature. More specifically, 30.44 < f2 / f < 55.13, 0.29 < R3 / f < 0.38, and 0.28 < R4 / f < 0.35.
[0056] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 1; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < R5 / f < 0.8; the curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: -2 < R6 / f < -0.8. The ranges satisfy the above conditions, so that the ratio of the focal length of the third lens and the shape of the object side surface and the image side surface of the third lens are reasonably limited, which helps to further correct the aberration. More specifically, 0.76 < f3 / f < 1, 0.66 < R5 / f < 0.74, and -1.97 < R6 / f < -0.88.
[0057] In some embodiments, the combined focal length f23 of the second lens and the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f23 / f < 1.1; the combined focal length f23 of the second lens and the third lens and the focal length f4 of the fourth lens satisfy: -0.2 < f23 / f4 < -0.05. The ranges satisfy the above conditions, so that the refractive power distribution of the second lens, the third lens and the fourth lens is reasonable, which helps the optical lens to achieve long focal characteristics. More specifically, 0.78 < f23 / f < 1.01, and -0.18 < f23 / f4 < -0.07.
[0058] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: 0.3 < f4 / f5 < 1.5; the curvature radius R8 of the image side of the fourth lens and the curvature radius R9 of the object side of the fifth lens satisfy: -8.1 < (R8-R9) / (R8+R9) < -2.8; the curvature radius R8 of the image side of the fourth lens and the curvature radius R9 of the object side of the fifth lens satisfy: -0.8 < R8 / R9 < -0.4. By reasonably limiting the focal length ratio of the fourth lens and the fifth lens, and the shape of the image side of the fourth lens and the object side of the fifth lens, the edge field of view beam trend is increased, while the off-axis aberration of the optical lens is reduced. More specifically, 0.32 < f4 / f5 < 1.41.
[0059] In some embodiments, the curvature radius R9 of the object side of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 1.8; the curvature radius R10 of the image side of the fifth lens and the effective focal length f of the optical lens satisfy: 0.7 < R10 / f < 1.3. By reasonably limiting the shape of the object side and the image side of the fifth lens, the edge field of view angle light can be converged, and the relative luminance of the optical lens is improved. More specifically, 1.04 < R9 / f < 1.72, 0.75 < R10 / f < 1.27.
[0060] In some embodiments, the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -0.9 < R5 / R6 < -0.3; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 1.1 < R9 / R10 < 1.9. By reasonably limiting the shape of the object side and the image side of the third lens, and the shape of the object side and the image side of the fifth lens, the aberration is optimized, and the imaging quality is improved. More specifically, -0.83 < R5 / R6 < -0.36, 1.12 < R9 / R10 < 1.84.
[0061] In some embodiments, the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -0.5 < (R5+R6) / (R5-R6) < 0; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side satisfy: 3.3 < (R9+R10) / (R9-R10) < 16.7. By reasonably limiting the shape of the object side and the image side of the third lens, and the shape of the object side and the image side of the fifth lens, the chromatic aberration is corrected, the eccentricity sensitivity is reduced, the aberration is balanced, the imaging quality is improved, and the processing difficulty is reduced. More specifically, -0.47 < (R5+R6) / (R5-R6) < -0.09, 3.39 < (R9+R10) / (R9-R10) < 16.67.
[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 < 36°; 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: 2.35 < IH / EPD < 2.45. Satisfying the above range makes the aperture match the field of view, which is beneficial to expand the field of view of the optical lens and increase the aperture of the optical lens, so as to obtain more picture information, meet the demand of large-range detection, and the large-aperture feature can enable the optical lens to shoot in a darker environment, while helping to blur the background and make the subject more prominent; and the width of the light beam entering the optical lens at different field angles can be reasonable, so that the brightness of the optical lens at the image plane is prompted, dark corners are avoided, and the image height of the optical lens is also increased, which is beneficial to the rear-end chip to obtain more picture information and reduce the information processing pressure of the rear-end chip. More specifically, 35.45° < FOV / Fno < 35.47°, 2.39 < IH / EPD < 2.42.
[0063] In some embodiments, the sum ∑CT of the center thicknesses of the first lens to the sixth lens along the optical axis and the total length TTL of the optical lens satisfy: 0.6 < ∑CT / TTL < 0.75, and the sum ∑CT of the center thicknesses of the first lens to the sixth lens along the optical axis and the effective focal length f of the optical lens satisfy: 0.75 < ∑CT / f < 0.9. Satisfying the above range can realize high-pixel characteristics, improve the imaging quality of the optical lens, and is beneficial to meet the processability of each lens and reduce production costs. More specifically, 0.65 < ∑CT / TTL < 0.71, 0.78 < ∑CT / f < 0.85.
[0064] In some embodiments, the object side half aperture radius d1 of the first lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 0.6 < d1 / (IH / 2) / tan(FOV / 2) < 0.7. Satisfying the above range helps to meet the small head requirement of the optical lens by reasonably controlling the relationship between the front end aperture of the optical lens, the real image height corresponding to the maximum field of view, and the maximum field of view, and improves the structural rationality of the optical lens. More specifically, 0.63 < d1 / (IH / 2) / tan(FOV / 2) < 0.66.
[0065] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -13 < f4 / f < -5. Satisfying the above range makes the fourth lens have a proper negative focal length, which helps to reasonably balance the positive focal length of the front end lens, avoids excessive light deflection caused by too concentrated focal length, and reduces the difficulty of chromatic aberration correction of the optical lens. More specifically, -12.41 < f4 / f < -4.68.
[0066] 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; the curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.3 < R2 / R3 < 1.7. Satisfying the above range, by reasonably limiting the focal length ratio of the first lens and the second lens, and the shape of the image side surface of the first lens and the object side surface of the second lens, it helps to correct various aberrations of the optical lens, improve the imaging quality of the optical lens, and improve the picture clarity. More specifically, 0.03 < f1 / f2 < 0.08, 1.37 < R2 / R3 < 1.61.
[0067] In some embodiments, the half-field radius of the object side surface of the fifth lens Sag9 and the half-field radius d9 satisfy: -0.3 < Sag9 / d9 < -0.05, and the half-field radius of the image side surface of the fifth lens Sag10 / d10 satisfy: -0.2 < Sag10 / d10 < -0.1. Satisfying the above range, by reasonably controlling the half-field radius and the corresponding sag of the object side surface of the fifth lens, and the half-field radius and the corresponding sag of the image side surface of the fifth lens, the imaging quality of the edge field can be effectively improved, and the imaging quality of the optical lens is improved. More specifically, -0.27 < Sag9 / d9 < -0.05, -0.2 < Sag10 / d10 < -0.14.
[0068] In some embodiments, the optical lens satisfies the condition formula: 13.2mm < f < 13.4mm, 65° < FOV < 66°, 7.1mm < EPD < 7.3mm, 15.8mm < TTL < 16mm, 1.8 < Fno < 1.9, 17mm < IH < 17.5mm, 35° < CRA < 38°, 1.7mm < BFL < 2mm; wherein f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents an optical total length of the optical lens, Fno represents an aperture value of the optical lens, IH represents an image height corresponding to the maximum field of view angle of the optical lens, CRA represents a chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents a back focal length of the optical lens. Satisfying the above condition indicates that the optical lens provided by the embodiments of the present application at least has the characteristics of small volume, large image surface, and large aperture. More specifically, 13.25mm < f < 13.36mm, 65.5° < FOV < 65.7°, 7.16mm < EPD < 7.23mm, 15.81mm < TTL < 15.99mm, 1.84 < Fno < 1.86, 17.28mm < IH < 17.32mm, 35.91° < CRA < 37.21°, 1.79mm < BFL < 1.98mm.
[0069] 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 first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in the optical lens provided by the present application all adopt plastic lenses.
[0070] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth 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, the fifth lens, and the sixth lens in the present application all can 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 the miniaturization of the lens.
[0071] 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:
[0072]
[0073] Wherein, z is the distance from the vertex of the aspheric surface to the position of the aspheric surface along the optical axis direction at the height of h, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, B, C, D, E, F, G, H, I, J are the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, sixteenth order, eighteenth order and twentieth order surface coefficients respectively.
[0074] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature and 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 modes, and are included in the protection scope of the application.
[0075] Embodiment 1
[0076] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, along the optical axis from the object side to the imaging surface, a stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.
[0077] The first lens L1 has positive focal power, the object side S1 thereof is a convex surface, and the image side S2 thereof is a concave surface;
[0078] The second lens L2 has positive focal power, the object side S3 thereof is a convex surface at the near optical axis, and the image side S4 thereof is a concave surface at the near optical axis;
[0079] The third lens L3 has positive focal power, the object side S5 and the image side S6 thereof are convex surfaces;
[0080] The fourth lens L4 has negative focal power, the object side S7 thereof is a concave surface, and the image side S8 thereof is a convex surface;
[0081] The fifth lens L5 has negative focal power, the object side S9 thereof is a convex surface at the near optical axis, and the image side S10 thereof is a concave surface at the near optical axis;
[0082] The sixth lens L6 has negative focal power, the object side S11 thereof is a concave surface, and the image side S12 thereof is a concave surface at the near optical axis;
[0083] The object side S13 and the image side S14 of the filter G1 are both planes;
[0084] The imaging surface S15 is a plane.
[0085] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspheric lenses.
[0086] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.
[0087] Table 1-1
[0088]
[0089]
[0090] The surface parameters of the aspheric lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.
[0091] Table 1-2
[0092] Face number K B C D E S1 -8.04E-01 6.51E-04 9.39E-05 -1.29E-05 2.94E-07 S2 -3.78E-01 -8.06E-03 1.27E-03 -8.91E-05 -2.79E-05 S3 -3.42E+00 -1.27E-02 1.34E-03 -1.77E-04 1.05E-05 S4 -4.18E+00 -7.54E-03 1.06E-03 -4.20E-04 9.33E-05 S5 1.43E+00 -4.02E-03 1.16E-03 -4.80E-04 9.64E-05 S6 9.21E+00 -3.01E-03 8.30E-04 -2.76E-04 5.42E-05 S7 -6.90E+00 -4.47E-03 3.91E-04 -5.89E-05 6.25E-06 S8 1.01E-01 -7.76E-04 2.29E-04 -2.14E-05 2.07E-06 S9 -9.90E+01 -3.42E-03 3.29E-05 -4.59E-06 6.67E-07 S10 -1.80E+01 -1.06E-03 -1.01E-04 1.06E-05 -6.17E-07 S11 4.81E+00 -3.84E-03 1.78E-04 -6.08E-06 6.06E-08 S12 -9.90E+01 -3.39E-03 1.12E-04 -3.57E-06 7.75E-08 Face number F G H I J S1 2.72E-07 -4.58E-08 3.40E-09 -1.22E-10 1.68E-12 S2 8.49E-06 -1.10E-06 7.60E-08 -2.73E-09 4.13E-11 S3 1.34E-06 -3.60E-07 3.45E-08 -1.54E-09 2.72E-11 S4 -9.49E-06 -1.78E-07 1.39E-07 -1.22E-08 3.57E-10 S5 -9.41E-06 -1.37E-07 1.23E-07 -1.07E-08 3.13E-10 S6 -5.13E-06 2.86E-08 3.59E-08 -2.75E-09 6.57E-11 S7 2.32E-07 -1.90E-07 2.18E-08 -9.26E-10 9.37E-12 S8 -1.38E-07 2.11E-09 3.74E-10 -2.36E-11 4.57E-13 S9 -6.97E-08 2.70E-09 4.43E-12 -4.21E-12 1.40E-13 S10 1.37E-08 1.60E-10 -9.46E-12 -1.76E-13 7.48E-15 S11 4.32E-09 -4.15E-11 -4.52E-12 -5.97E-14 4.68E-15 S12 -4.26E-10 -4.09E-12 -8.96E-14 2.61E-16 2.67E-17
[0093] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial chromatic aberration curve and the axial aberration curve of the optical lens 100 are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5
[0094] Figure 2 The field curvature curve of Embodiment 1 is shown, which represents the curvature of the meridional image surface and the sagittal image surface of light rays of different wavelengths, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.2mm-0.1mm, which shows that the optical lens can well correct the field curvature.
[0095] Figure 3 The F-Tan(Theta) distortion curve of Embodiment 1 is shown, which represents the distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the distortion of the optical lens is controlled within 0-2%, which shows that the optical lens can well correct the distortion.
[0096] Figure 4 The axial chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555μm) at different image heights on the imaging surface, the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3μm-2μm, which shows that the optical lens can well correct the chromatic aberration.
[0097] Figure 5 The relative illumination curve of the optical lens 100 in this embodiment is shown, which represents the relative illumination values of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination. It can be seen from the figure that the relative illumination value of the optical lens 100 is still greater than 50% at the edge field, which shows that the optical lens 100 has excellent relative illumination.
[0098] Embodiment 2
[0099] Please refer to Figure 6 , which is a structural schematic diagram of the optical lens 200 provided in Embodiment 2 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.
[0100] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.
[0101] Table 2-1
[0102]
[0103]
[0104] The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.
[0105] Table 2-2
[0106] Face number K B C D E S1 -9.13E-01 6.44E-04 9.80E-05 -1.29E-05 2.17E-07 S2 -1.21E+00 -8.68E-03 1.34E-03 -8.06E-05 -2.77E-05 S3 -1.33E+00 -1.18E-02 1.36E-03 -1.71E-04 1.06E-05 S4 -1.77E+00 -6.63E-03 1.16E-03 -4.19E-04 9.34E-05 S5 2.92E+00 -4.12E-03 1.15E-03 -4.66E-04 9.64E-05 S6 2.81E+01 -3.88E-03 7.57E-04 -2.75E-04 5.38E-05 S7 -1.45E+01 -4.72E-03 3.36E-04 -5.62E-05 6.06E-06 S8 3.01E+00 -1.69E-03 2.74E-04 -2.10E-05 1.97E-06 S9 -9.90E+01 -3.46E-03 5.96E-05 -1.04E-05 8.19E-07 S10 1.41E+00 -1.21E-03 -1.08E-04 1.07E-05 -6.15E-07 S11 6.46E+00 -3.40E-03 1.77E-04 -5.59E-06 6.38E-08 S12 -3.22E+01 -2.76E-03 1.04E-04 -3.75E-06 7.90E-08 Face number F G H I J S1 2.77E-07 -4.53E-08 3.37E-09 -1.26E-10 1.98E-12 S2 8.47E-06 -1.10E-06 7.62E-08 -2.71E-09 3.88E-11 S3 1.28E-06 -3.59E-07 3.48E-08 -1.59E-09 2.84E-11 S4 -9.50E-06 -1.82E-07 1.38E-07 -1.21E-08 3.58E-10 S5 -9.44E-06 -1.35E-07 1.23E-07 -1.07E-08 3.16E-10 S6 -5.05E-06 3.24E-08 3.54E-08 -2.79E-09 6.87E-11 S7 2.51E-07 -1.83E-07 2.17E-08 -1.03E-09 1.58E-11 S8 -1.48E-07 2.13E-09 4.08E-10 -2.23E-11 3.84E-13 S9 -6.19E-08 2.03E-09 -5.17E-11 -4.72E-12 3.74E-13 S10 1.38E-08 1.65E-10 -9.43E-12 -1.82E-13 7.39E-15 S11 4.07E-09 -4.62E-11 -4.40E-12 -5.60E-14 4.30E-15 S12 -4.14E-10 -5.33E-12 -6.10E-14 1.61E-15 -2.65E-19
[0107] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial chromatic aberration curve, and the relative illumination curve of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 respectively.
[0108] It can be seen from Figure 7 that the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.2mm~0.1mm, which shows that the optical lens can well correct the field curvature.
[0109] It can be seen from Figure 8 that the distortion of the optical lens is controlled within 0~2%, which shows that the optical lens can well correct the distortion.
[0110] It can be seen from Figure 9 that the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-3μm~2μm, which shows that the optical lens can better correct the chromatic aberration.
[0111] As can be seen from Figure 10 , the relative illumination value of the optical lens is still greater than 50% at the edge field of view, which indicates that the optical lens has excellent relative illumination.
[0112] Embodiment 3
[0113] Referring to Figure 11 , a structural schematic diagram of an optical lens 300 provided in Embodiment 3 of the present application is shown, and the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.
[0114] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.
[0115] Table 3-1
[0116]
[0117] The surface type parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.
[0118] Table 3-2
[0119]
[0120]
[0121] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial chromatic aberration curve and the relative illumination curve of the optical lens 300 are shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 respectively.
[0122] As can be seen from Figure 12 , 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 can well correct the field curvature.
[0123] As can be seen from Figure 13 , the distortion of the optical lens is controlled within-0.5%-2%, which indicates that the optical lens can well correct the distortion.
[0124] As can be seen from Figure 14 , the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, which indicates that the optical lens can well correct the chromatic aberration.
[0125] As can be seen from Figure 15As can be seen, the relative illumination value of the optical lens is still greater than 50% at the edge field of view, which indicates that the optical lens has excellent relative illumination.
[0126] Referring to Table 4, the optical characteristics corresponding to the above-mentioned embodiments are shown, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.
[0127] Table 4
[0128]
[0129]
[0130] In summary, the optical lens provided by the present application can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens by specific surface shape setting and reasonable power distribution, so that the optical lens has the advantages of long focal length, miniaturization, high pixel, low distortion, etc., and meets the development of mobile devices which are increasingly miniaturized and high-performance. The lens aperture value provided by the present application can be 1.85, which can match a 1 / 0.98" chip, and can effectively meet the design requirements of large aperture and large target surface.
[0131] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0132] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation on the scope of the patent of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. An optical lens, six pieces of lenses in total, characterized in that, In order from the object side to the imaging plane along the optical axis, successively comprise: a first lens with positive refractive power, the object side of which is convex, and the image side of which is concave; a second lens with positive refractive power, the object side of which is convex at the vicinity of the optical axis, and the image side of which is concave at the vicinity of the optical axis; a third lens with positive refractive power, the object side and the image side of which are both convex; a fourth lens with negative refractive power, the object side of which is concave, and the image side of which is convex; a fifth lens with negative refractive power, the object side of which is convex at the vicinity of the optical axis, and the image side of which is concave at the vicinity of the optical axis; a sixth lens with negative refractive power, the object side of which is concave, and the image side of which is concave at the vicinity of the optical axis; wherein the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -25 < f5 / f < -3; the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 1 < (IH / 2) / (f*tan(FOV / 2)) < 1.
02.
2. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.15 < TTL / f < 1.25; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.9 < TTL / IH < 0.
95.
3. The optical lens of claim 1, wherein, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 2 < f1 / f < 2.4; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.4 < f6 / f < -1.
4. The optical lens of claim 1, wherein, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 30 < f2 / f < 56; the curvature radius R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy: 0.25 < R3 / f < 0.4; the curvature radius R4 of the image side of the second lens and the effective focal length f of the optical lens satisfy: 0.25 < R4 / f < 0.
4.
5. The optical lens of claim 1, wherein, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 1; the curvature radius R5 of the object side of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < R5 / f < 0.8; the curvature radius R6 of the image side of the third lens and the effective focal length f of the optical lens satisfy: -2 < R6 / f < -0.
8.
6. The optical lens of claim 1, wherein, the combined focal length f23 of the second lens and the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f23 / f < 1.1; the combined focal length f23 of the second lens and the third lens and the focal length f4 of the fourth lens satisfy: -0.2 < f23 / f4 < -0.
05.
7. The optical lens of claim 1, wherein, The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: 0.3 < f4 / f5 < 1.5; the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -8.1 < (R8-R9) / (R8+R9) < -2.8; the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -0.8 < R8 / R9 < -0.
4.
8. The optical lens of claim 1, wherein, The curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < R9 / f < 1.8; the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.7 < R10 / f < 1.
3.
9. The optical lens of claim 1, wherein, 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: -0.9 < R5 / R6 < -0.3; 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: 1.1 < R9 / R10 < 1.
9.
10. The optical lens of claim 1, wherein, 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: -0.5 < (R5+R6) / (R5-R6) < 0; 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: 3.3 < (R9+R10) / (R9-R10) < 16.7.
Citation Information
Patent Citations
Camera lens
CN113009673A
Optical imaging lens
CN208477185U