Optical lens
By designing an optical lens with six lenses and using a combination of lenses with specific optical power and surface shape, the problem of mobile phone lenses being unable to achieve large aperture and large image area has been solved, thus improving image quality and night shooting effects.
Patent Information
- Application Number
- CN202411983667.8
- 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 the case of poor image quality in portrait photography and night shooting.
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, the lens achieves the characteristics of large aperture and long focal length.
It achieves high-quality imaging with a large aperture, enhances low-light shooting capabilities, and reduces optical distortion and chromatic aberration through reasonable optical design, thereby improving resolution and image quality.
Smart Images
Figure CN119667908B_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 higher and higher requirements for the shooting function of the phone. The 35mm focal length (i.e. the full field angle of 63°) is considered to be the classic focal length of human photography, which is easier to highlight the main body than the 24mm focal length; compared with the 50mm focal length, it has a larger shooting angle and is suitable for a wider range of scenes. The lens with a 35mm focal length can provide a rich scene capturing capability 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 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 than for 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, comprising six lenses, arranged in order from the object side to the image plane along the optical axis, 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, and the image side surface of which is a concave surface;
[0009] a third 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;
[0010] a fourth 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;
[0011] a fifth lens with positive refractive power, the object side surface of which is a convex surface near the optical axis;
[0012] a sixth lens with negative refractive power, the image side surface of which is a concave surface near the optical axis;
[0013] wherein the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -8.4<(R7+R8) / (R7-R8)<-3.6.
[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 angle of the optical lens satisfy: 0.9 < TTL / IH < 0.95; the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle FOV of the optical lens satisfy: 1 < (IH / 2) / (f x tan(FOV / 2)) < 1.03.
[0015] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.35 < IH / EPD < 2.45; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.25 < IH / f < 1.35.
[0016] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 2.5 < f1 / f < 3.3; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5 < f6 / f < -0.7.
[0017] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 3.2 < f2 / f < 5.6; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -0.1 < (R3-R4) / (R3+R4) < 0.
[0018] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.7 < f3 / f < 40; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.1 < f4 / f < 42.
[0019] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < f5 / f < 4; the sagittal height Sag9 of the half entrance pupil diameter of the object side surface of the fifth lens and the half entrance pupil diameter d9 satisfy: 0 < Sag9 / d9 < 0.15.
[0020] Further preferably, the combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.4 < f23 / f45 < 5.1; the effective focal length f of the optical lens and the center distance CT34 of the third lens and the fourth lens on the optical axis satisfy: 35 < f / CT34 < 97.
[0021] It is further preferred that the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -3.3 < f5 / f6 < -1.3; and the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 0.3 < R10 / R11 < 1.5.
[0022] It is further preferred that the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: 1.3 < f4 / f5 < 10.4; the curvature radius R8 of the image side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 0.95 < R8 / f < 8.7; the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < R9 / f < 1.5; the image side surface of the fifth lens is concave at the near optical axis, and the object side surface of the sixth lens is convex at the near optical axis; or, the image side surface of the fifth lens is convex, and the object side surface of the sixth lens is concave.
[0023] Compared with the prior art, the optical lens provided by the application adopts six lenses with specific focal lengths, and through specific surface shape settings and reasonable focal length 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 ability for photographers and display 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 night environment. 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 an axial chromatic aberration curve of the optical lens according to the embodiment of the present application.
[0029] Figure 5 Fig. 5 is a relative illumination curve of the optical lens according to the embodiment of the present application.
[0030] Figure 6 Fig. 6 is a structural schematic diagram of an optical lens according to another embodiment of the present application.
[0031] Figure 7Field curvature curve of the optical lens in Embodiment 2 of the present application.
[0032] Figure 8 F-Tan(Theta) distortion curve of the optical lens in Embodiment 2 of the present application.
[0033] Figure 9 Vignette curve of the optical lens in Embodiment 2 of the present application.
[0034] Figure 10 Relative illumination curve of the optical lens in Embodiment 2 of the present application.
[0035] Figure 11 Structure diagram of the optical lens in Embodiment 3 of the present application.
[0036] Figure 12 Field curvature curve of the optical lens in Embodiment 3 of the present application.
[0037] Figure 13 F-Tan(Theta) distortion curve of the optical lens in Embodiment 3 of the present application.
[0038] Figure 14 Vignette curve of the optical lens in Embodiment 3 of the present application.
[0039] Figure 15 Relative illumination curve of the optical lens in 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 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.
[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, and a concave image side surface. The third lens can have positive refractive power, a convex object side surface at the paraxial region, and a concave image side surface at the paraxial region. The fourth lens can have positive refractive power, a convex object side surface, and a concave image side surface. The fifth lens can have positive refractive power, a convex object side surface at the paraxial region, and a concave image side surface at the paraxial region or a convex image side surface. The sixth lens can have negative refractive power, a convex object side surface at the paraxial region or a concave object side surface, and a concave image side surface at the paraxial region.
[0050] In some embodiments, the image side surface of the fifth lens is concave at the paraxial region, and the object side surface of the sixth lens is convex at the paraxial region; or, the image side surface of the fifth lens is convex, and the object side surface of the sixth lens is concave.
[0051] 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 to change the brightness of the image.
[0052] In some embodiments, the optical lens can further include a filter, which can be disposed between the sixth lens and the image plane. The filter is used to filter out interference light to prevent the interference light from reaching the image plane of the optical lens and affecting normal imaging.
[0053] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -8.4 < (R7+R8) / (R7-R8) < -3.6. By reasonably limiting the curvature radii of the object side surface and the image side surface of the fourth lens, the chromatic aberration is corrected, the sensitivity to decentration of the optical lens is reduced, the aberration is balanced, and the imaging quality is improved. More specifically, -8.38 < (R7+R8) / (R7-R8) < -3.65.
[0054] In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.15 < TTL / f < 1.25; the optical total 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*tan(FOV / 2)) < 1.03. Satisfying the above ranges, while good imaging quality is taken into account, the total length of the optical lens is shortened, the optical lens is miniaturized, the demand for miniaturization and large image surface in the mobile phone application scenario is met, the optical distortion of the optical lens is well controlled, 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.
[0055] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.35 < IH / EPD < 2.45; 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: 1.25 < IH / f < 1.35. Satisfying the above ranges, the width of the light beam entering the optical lens at different field angles is reasonable, the brightness of the optical lens at the image surface is prompted, the dark corner is avoided, the image height of the optical lens can be increased at the same time, the rear-end chip can obtain more picture information, and the information processing pressure of the rear-end chip is reduced; the relationship between the image height and the focal length can be balanced, and the structural stability of the optical lens is improved. More specifically, 2.39 < IH / EPD < 2.43, and 1.28 < IH / f < 1.32.
[0056] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 2.5 < f1 / f < 3.3; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5 < f6 / f < -0.7. Satisfying the above ranges, the first lens has a suitable positive refractive power, the sixth lens has a suitable negative refractive power, the light ray trend can be reasonably controlled in the front and rear parts of the optical lens respectively, the difficulty of aberration correction of the middle lens can be reduced, and the imaging quality is improved. More specifically, 2.52 < f1 / f < 3.3, and -1.41 < f6 / f < -0.71.
[0057] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 3.2 < f2 / f < 5.6; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: -0.1 < (R3-R4) / (R3+R4) < 0. By satisfying the above ranges, the convergence of light rays is better achieved by reasonably limiting the focal length and the surface shape of the second lens, and the total length of the optical lens is reduced. More specifically, 3.24 < f2 / f < 5.54, and -0.06 < (R3-R4) / (R3+R4) < 0.
[0058] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.7 < f3 / f < 40; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.1 < f4 / f < 42. By satisfying the above ranges, the aberration is further corrected by reasonably limiting the focal length ratio of the third lens and the fourth lens, and the imaging quality is improved. More specifically, 2.74 < f3 / f < 39.19, and 3.19 < f4 / f < 41.16.
[0059] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < f5 / f < 4; the half-field radius sag9 of the object side of the fifth lens and the half-field radius d9 satisfy: 0 < sag9 / d9 < 0.15. By satisfying the above ranges, the edge field of view light ray trend is controlled to increase the image height by reasonably limiting the focal length ratio of the fifth lens and the shape of the object side of the fifth lens, while reducing the off-axis aberration of the optical lens. More specifically, 0.98 < f5 / f < 3.99, and 0.03 < sag9 / d9 < 0.13.
[0060] In some embodiments, the combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.4 < f23 / f45 < 5.1; the effective focal length f of the optical lens and the center distance CT34 of the third lens and the fourth lens on the optical axis satisfy: 35 < f / CT34 < 97. By satisfying the above ranges, the focal length ratio of the second lens, the third lens, the fourth lens and the fifth lens, and the center distance of the third lens and the fourth lens are reasonably limited, which helps to reasonably distribute the focal power of each lens, and the optical lens is improved to realize long-focus characteristics and improve the detail information of the central field of view. More specifically, 0.41 < f23 / f45 < 5.01, and 35.17 < f / CT34 < 96.52.
[0061] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -3.3 < f5 / f6 < -1.3; the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 0.3 < R10 / R11 < 1.5. By reasonably limiting the focal length ratio of the fifth lens and the sixth lens, and the shape of the image side surface of the fifth lens and the object side surface of the sixth lens, the light path is reasonably controlled, the aberration is optimized, and the imaging quality is improved, when the above ranges are satisfied. More specifically, -3.28 < f5 / f6 < -1.36, 0.36 < R10 / R11 < 1.44.
[0062] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: 1.3 < f4 / f5 < 10.4; the curvature radius R8 of the image side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 0.95 < R8 / f < 8.7; the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < R9 / f < 1.5. By reasonably limiting the focal length ratio of the fourth lens and the fifth lens, and the shape of the image side surface of the fourth lens and the object side surface of the fifth lens, the light is converged, more light is transmitted to the rear end of the optical lens, and the relative luminance of the optical lens is improved, when the above ranges are satisfied. More specifically, 1.32 < f4 / f5 < 10.34, 0.98 < R8 / f < 8.61, 0.92 < R9 / f < 1.41.
[0063] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis and the total track length TTL of the optical lens satisfy: 0.6 < ∑CT / TTL < 0.7, and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis and the effective focal length f of the optical lens satisfy: 0.7 < ∑CT / f < 0.85. When the above ranges are satisfied, high-pixel characteristics can be achieved, the imaging quality of the optical lens is improved, and the processability of each lens is facilitated, thereby reducing production costs. More specifically, 0.61 < ∑CT / TTL < 0.7, 0.73 < ∑CT / f < 0.82.
[0064] In some embodiments, the object side surface half aperture radius d1 of the first lens, the real image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 0.6 < d1 / (IH / 2) / tan(FOV / 2) < 0.7. 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 angle, and the maximum field of view angle, the small head requirement of the optical lens is met, and the structural rationality of the optical lens is improved, when the above range is satisfied. More specifically, 0.63 < d1 / (IH / 2) / tan(FOV / 2) < 0.66.
[0065] In some embodiments, the third lens has an image-side curvature radius R6 and an effective focal length f of the optical lens satisfying 0.7 < R6 / f < 1.5; the third lens has a material-side curvature radius R5 and the image-side curvature radius R6 satisfying 0.5 < R5 / R6 < 1.1. By reasonably limiting the image-side curvature radius of the third lens and the effective focal length of the optical lens, and the shape of the material-side and the image-side of the third lens, the light rays can be further converged, the difficulty of aberration correction of the rear optical lens is reduced, and the imaging quality of the optical lens is improved. More specifically, 0.72 < R6 / f < 1.5, and 0.5 < R5 / R6 < 1.02.
[0066] In some embodiments, the fourth lens has a material-side curvature radius R7 and an effective focal length f of the optical lens satisfying 0.75 < R7 / f < 6.6; the fourth lens has the material-side curvature radius R7 and an image-side curvature radius R8 satisfying 0.5 < R7 / R8 < 0.8. By reasonably limiting the material-side curvature radius of the fourth lens and the effective focal length of the optical lens, and the shape of the material-side and the image-side of the fourth lens, the distortion and the astigmatism of the optical lens are balanced, so that the optical lens has good imaging quality. More specifically, 0.77 < R7 / f < 6.59, and 0.56 < R7 / R8 < 0.8.
[0067] In some embodiments, the first lens has an image-side curvature radius R2 and the second lens has a material-side curvature radius R3 satisfying 15 < (R2+R3) / (R2-R3) < 21; the first lens has the image-side curvature radius R2 and the second lens has the material-side curvature radius R3 satisfying 1 < R2 / R3 < 1.2. By reasonably limiting the shape of the image-side of the first lens and the material-side of the second lens, the astigmatism and the field curvature are optimized, and the difficulty of high-order aberration correction of the subsequent lens is reduced. More specifically, 15.66 < (R2+R3) / (R2-R3) < 20.96, and 1.09 < R2 / R3 < 1.15.
[0068] In some embodiments, the optical lens satisfies the condition formula: 13mm < f < 13.5mm, 65° < FOV < 66°, 7.1mm < EPD < 7.3mm, 15.7mm < TTL < 16mm, 1.8 < Fno < 1.9, 17mm < IH < 17.5mm, 37° < CRA < 41.5°, 1.9mm < BFL < 2.2mm; 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, 13.26mm < f < 13.37mm, 65.5° < FOV < 65.7°, 7.16mm < EPD < 7.23mm, 15.76mm < TTL < 15.99mm, 1.84 < Fno < 1.86, 17.28mm < IH < 17.37mm, 37.09° < CRA < 41.12°, 1.93mm < BFL < 2.2mm.
[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, and 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, in sequence from the object side to the imaging surface along the optical axis, a diaphragm 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 surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface.
[0078] The second lens L2 has positive focal power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface.
[0079] The third lens L3 has positive focal power, the object side surface S5 thereof is a convex surface at the near optical axis, and the image side surface S6 thereof is a concave surface at the near optical axis.
[0080] The fourth lens L4 has positive focal power, the object side surface S7 thereof is a convex surface, and the image side surface S8 thereof is a concave surface.
[0081] The fifth lens L5 has positive focal power, the object side surface S9 thereof is a convex surface at the near optical axis, and the image side surface S10 thereof is a concave surface at the near optical axis.
[0082] The sixth lens L6 has negative focal power, the object side surface S11 thereof is a convex surface at the near optical axis, and the image side surface S12 thereof is a concave surface at the near optical axis.
[0083] The object side surface S13 and the image side surface S14 of the filter G1 are both flat surfaces.
[0084] The imaging surface S15 is a flat surface.
[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 -5.91E-01 -1.29E-04 2.14E-04 -2.00E-05 2.01E-07 S2 -1.61E+01 -5.19E-03 1.21E-03 -7.08E-05 -2.88E-05 S3 -9.69E+00 -9.28E-03 1.66E-03 -1.74E-04 8.60E-06 S4 -6.94E+00 -2.80E-03 1.45E-03 -4.33E-04 9.26E-05 S5 5.17E+00 -2.19E-03 1.12E-03 -5.02E-04 9.67E-05 S6 -7.29E+01 -3.97E-03 1.29E-03 -3.79E-04 5.81E-05 S7 -9.43E+01 -7.38E-03 1.09E-03 -8.51E-05 6.50E-06 S8 -6.39E+01 -4.18E-03 5.42E-04 -9.89E-06 1.03E-06 S9 4.64E+00 -2.66E-03 1.49E-04 -1.65E-05 1.48E-06 S10 -9.90E+01 -9.55E-04 -3.36E-05 6.77E-06 -4.42E-07 S11 2.42E+01 -5.17E-03 1.14E-04 -4.13E-07 -1.84E-08 S12 -2.74E-01 -4.11E-03 1.28E-04 -3.57E-06 6.93E-08 Face number F G H I J S1 2.81E-07 -4.46E-08 3.44E-09 -1.31E-10 1.59E-12 S2 8.47E-06 -1.08E-06 7.48E-08 -2.82E-09 4.58E-11 S3 1.39E-06 -3.45E-07 3.42E-08 -1.78E-09 3.97E-11 S4 -9.24E-06 -1.63E-07 1.37E-07 -1.25E-08 3.83E-10 S5 -9.26E-06 -1.41E-07 1.22E-07 -1.03E-08 2.80E-10 S6 -4.68E-06 1.19E-08 3.36E-08 -2.62E-09 6.09E-11 S7 3.11E-07 -1.76E-07 2.03E-08 -1.08E-09 2.24E-11 S8 -2.11E-07 6.96E-09 5.36E-10 -4.06E-11 6.92E-13 S9 -7.84E-08 1.42E-09 3.34E-11 -1.32E-12 5.13E-15 S10 1.04E-08 7.97E-11 -6.04E-12 -1.12E-13 4.59E-15 S11 4.86E-10 4.89E-12 -1.94E-12 -3.28E-14 2.06E-15 S12 -7.68E-10 1.32E-12 4.77E-14 8.98E-17 -5.41E-18
[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 -0.3mm-0.2mm, 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 -2μm-3μm, 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 45% 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 fifth lens image side surface is a convex surface, the sixth lens object side surface is a concave surface, and the optical parameters such as the curvature radius 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 -6.21E-01 -2.96E-04 2.33E-04 -2.35E-05 4.60E-07 S2 -1.67E+01 -5.53E-03 1.18E-03 -6.28E-05 -2.94E-05 S3 -1.10E+01 -9.12E-03 1.64E-03 -1.71E-04 8.36E-06 S4 -7.10E+00 -3.33E-03 1.64E-03 -4.60E-04 9.39E-05 S5 5.48E+00 -2.58E-03 1.09E-03 -4.99E-04 9.85E-05 S6 -9.22E+01 -3.26E-03 1.25E-03 -3.79E-04 5.89E-05 S7 -9.90E+01 -6.59E-03 1.04E-03 -8.99E-05 6.88E-06 S8 -7.00E+01 -3.82E-03 4.19E-04 -9.68E-07 8.81E-07 S9 4.91E+00 -3.13E-03 1.59E-04 -1.32E-05 1.35E-06 S10 -1.17E+01 -5.06E-04 -7.62E-05 7.27E-06 -3.42E-07 S11 -1.79E+01 -6.02E-03 1.61E-04 -2.73E-06 5.01E-08 S12 -1.42E-01 -3.52E-03 1.22E-04 -3.68E-06 7.74E-08 Face number F G H I J S1 2.80E-07 -4.57E-08 3.43E-09 -1.26E-10 1.51E-12 S2 8.44E-06 -1.07E-06 7.51E-08 -2.85E-09 4.60E-11 S3 1.37E-06 -3.44E-07 3.44E-08 -1.78E-09 3.86E-11 S4 -9.10E-06 -1.83E-07 1.35E-07 -1.21E-08 3.65E-10 S5 -9.27E-06 -1.54E-07 1.22E-07 -1.03E-08 2.88E-10 S6 -4.65E-06 3.96E-09 3.29E-08 -2.57E-09 6.43E-11 S7 3.19E-07 -1.76E-07 2.03E-08 -1.07E-09 2.24E-11 S8 -2.24E-07 8.75E-09 5.84E-10 -5.50E-11 1.21E-12 S9 -7.75E-08 1.56E-09 3.13E-11 -1.61E-12 1.22E-14 S10 1.14E-08 7.38E-12 -7.76E-12 -1.19E-14 2.77E-15 S11 2.21E-09 -7.96E-11 -9.01E-13 2.00E-13 -5.72E-15 S12 -9.06E-10 2.19E-12 6.52E-14 -5.71E-16 8.09E-19
[0107] In this embodiment, the field curvature curve, F-Tan(Theta) distortion curve, vertical axis chromatic aberration curve and 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-0.4mm~0.2mm, 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 9It can be seen from
[0111] From Figure 10 It can be seen from
[0112] Embodiment 3
[0113] Please refer to Figure 11 , which is a structural schematic view of the optical lens 300 provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference between the embodiment 3 and the 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 the 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 the embodiment 3 are shown in Table 3-2.
[0118] Table 3-2
[0119]
[0120]
[0121] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the sagittal color difference curve and the relative illumination curve of the optical lens 300 are shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 respectively.
[0122] It can be seen from Figure 12 that the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.5mm~0.2mm, which indicates that the optical lens can correct the field curvature well.
[0123] It can be seen from Figure 13 that the distortion of the optical lens is controlled within 0~2%, which indicates that the optical lens can correct the distortion well.
[0124] It can be seen from Figure 14 that the sagittal color difference of the longest wavelength and the shortest wavelength is controlled within-2um~3um, which indicates that the optical lens can correct the color difference well.
[0125] FromFigure 15 It can be seen that 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 track 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 embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope 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 within the scope of protection of the present application. Therefore, the scope of protection 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, sequentially comprise: a first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a third lens with positive refractive power, the object side surface of which is convex at the near optical axis, and the image side surface of which is concave at the near optical axis; a fourth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex at the near optical axis; a sixth lens with negative refractive power, the image side surface of which is concave at the near optical axis; wherein the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -8.4<(R7+R8) / (R7-R8)<-3.6; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.7<f3 / f<40; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 3.1<f4 / f<42.
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 angle of the optical lens satisfy: 0.9<TTL / IH<0.95; the effective focal length f, the maximum field angle FOV of the optical lens, and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 1<(IH / 2) / (f*tan(FOV / 2))<1.
03.
3. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.35<IH / EPD<2.45; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.25<IH / f<1.
35.
4. 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: 2.5<f1 / f<3.3; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5<f6 / f<-0.
7.
5. 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: 3.2<f2 / f<5.6; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -0.1<(R3-R4) / (R3+R4)<0.
6. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle FOV of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.6<d1 / (IH / 2) / tan(FOV / 2)<0.
7.
7. The optical lens of claim 1, wherein, The focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9<f5 / f<4; the sagittal height Sag9 and the half diameter d9 of the object side surface of the fifth lens satisfy: 0<Sag9 / d9<0.
15.
8. The optical lens of claim 1, wherein, A combination focal length f23 of the second lens and the third lens and a combination focal length f45 of the fourth lens and the fifth lens satisfy: 0.4 < f23 / f45 < 5.1; an effective focal length f of the optical lens and a center distance CT34 of the third lens and the fourth lens on the optical axis satisfy: 35 < f / CT34 < 97.
9. The optical lens of claim 1, wherein, A focal length f5 of the fifth lens and a focal length f6 of the sixth lens satisfy: -3.3 < f5 / f6 < -1.3; a curvature radius R10 of the image side surface of the fifth lens and a curvature radius R11 of the object side surface of the sixth lens satisfy: 0.3 < R10 / R11 < 1.
5.
10. The optical lens of claim 1, wherein, A focal length f4 of the fourth lens and a focal length f5 of the fifth lens satisfy: 1.3 < f4 / f5 < 10.4; a curvature radius R8 of the image side surface of the fourth lens and an effective focal length f of the optical lens satisfy: 0.95 < R8 / f < 8.7; a curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.9 < R9 / f < 1.5; The image side surface of the fifth lens is concave at the near optical axis, and the object side surface of the sixth lens is convex at the near optical axis; or, the image side surface of the fifth lens is convex, and the object side surface of the sixth lens is concave.
Citation Information
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