Optical lens

Abstract

The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with a positive optical power, whose object side is convex and whose image side is concave; a second lens with a negative optical power, whose object side is convex and whose image side is concave; a third lens with a positive optical power, whose object side is convex and whose image side is concave near the optical axis; a fourth lens with a positive optical power, whose object side is convex near the optical axis and whose image side is convex; a fifth lens with a negative optical power, whose object side is concave and whose image side is concave; a sixth lens with a positive optical power, whose object side is concave and whose image side is convex; a seventh lens with a negative optical power, whose object side is concave and whose image side is concave near the optical axis; the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -6 < f6 / f7 < -3.5. The optical lens provided by the present invention has one or more advantages such as long focal length performance, large target surface, large aperture, and high pixel.

Description

Technical Field

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

[0002] With the continuous upgrading of smartphones, consumers have higher and higher requirements for the shooting functions of mobile phones. The 35mm focal length (i.e., a full field of view of 63°) is considered a classic focal length for humanistic photography. Compared with the 24mm focal length, it is easier to highlight the subject; compared with the 50mm focal length, it has a larger shooting angle and is applicable to a wider range of scenarios. The 35mm focal length lens, with its relatively large viewing angle, can provide photographers with a rich ability to capture scenes, especially suitable for shooting full-body portraits; when shooting portraits, the subject can be naturally integrated into the surrounding environment, showing a more vivid and story-rich picture.

[0003] However, few smartphones on the market are equipped with 35mm focal length main cameras, partly because it is more difficult to increase the aperture and image height of lenses with this focal length compared to 24mm focal length lenses. Therefore, how to ensure that the system has large aperture, large target surface and other characteristics while meeting the requirements of telephoto performance while ensuring high imaging quality is an urgent problem to be solved. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having one or more advantages such as telephoto performance, large target surface, large aperture, and high pixel.

[0005] The technical solution adopted by the present invention is:

[0006] An optical lens, composed of seven lenses, including the following lenses in order from the object side to the imaging surface along the optical axis:

[0007] The first lens has positive refractive power, its object side surface is convex, and its image side surface is concave;

[0008] The second lens has a negative optical power, its object side surface is convex, and its image side surface is concave;

[0009] The third lens has positive refractive power, its object side surface is convex, and its image side surface is concave near the optical axis;

[0010] The fourth lens has positive refractive power, its object side surface is convex at the near optical axis, and its image side surface is convex;

[0011] a fifth lens having negative optical power, whose object-side surface is concave and whose image-side surface is concave;

[0012] a sixth lens having positive refractive power, whose object side surface is concave and whose image side surface is convex;

[0013] The seventh lens with a negative optical power, having a concave object side and a concave image side near the optical axis;

[0014] Wherein, the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -6 < f6 / f7 < -3.5.

[0015] Further preferably, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f2345 of the second lens, the third lens, the fourth lens and the fifth lens satisfy: 0.15 < f34 / f2345 < 0.3.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.5; the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: 0.4 < R1 / R2 < 0.6.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1.5 < f2 / f < -1.2; 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: 1.8 < R3 / R4 < 2.5.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 1.2; the curvature radius R6 of the image side of the third lens and the effective focal length f of the optical lens satisfy: 3 < R6 / f < 20.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8 < f4 / f < 1.2.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.5 < f5 / f < -0.9; 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: -20 < R9 / R10 < -1.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.5 < f6 / f < 3.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.3.

[0023] Further preferably, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0.9 <f3 / f4<1.1。

[0024] Further preferably, 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: <f×(43.27 / IH)<35。

[0025] Further preferably, the center thickness CT6 of the sixth lens and the center thickness CT7 of the seventh lens satisfy: 0.5 <CT6 / CT7<0.9。

[0026] Compared with the prior art, the optical lens provided by the present invention has a large aperture through a specific surface shape setting and a reasonable distribution of optical focal length, so that the lens can achieve high-definition imaging even in a dim environment; it can also achieve the large target surface characteristics of the lens, and can be matched with a 1-inch ultra-large bottom COMS chip, which is conducive to improving the lens resolution and image detail restoration; it can better achieve the humanistic imaging effect of a focal length of nearly 35mm, and can shoot a more realistic picture sense. In addition, the optical lens of the present invention has a telephoto characteristic, which can achieve the shooting experience of "pulling close" distant scenes, which is conducive to better achieving the shooting effect of a small depth of field, blurring the background, and highlighting the subject; at the same time, it can also reasonably correct the overall aberration of the optical lens, so that the optical lens has high pixels and improves the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0029] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0030] Figure 3 4 is a F-Tan(θ) distortion curve of the optical lens in Example 1 of the present invention.

[0031] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0032] Figure 5 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0033] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0034] Figure 74 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0035] Figure 8 4 is a F-Tan(θ) distortion curve of the optical lens in Example 2 of the present invention.

[0036] Fig. 9 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0037] Fig.10 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0038] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0039] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0040] Fig.13 4 is a F-Tan(θ) distortion curve of the optical lens in Example 3 of the present invention.

[0041] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0042] Fig.15 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0043] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0044] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0045] Fig.18 4 is a F-Tan(θ) distortion curve of the optical lens in Example 4 of the present invention.

[0046] Fig.19 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0047] Fig. 20 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0048] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0049] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0051] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0052] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0053] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0054] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0055] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the accompanying drawings and in combination with the embodiments.

[0056] The optical lens provided by the embodiment of the present invention is composed of seven lenses, which are, in order from the object side to the imaging surface along the optical axis, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0057] In some embodiments, the first lens may have a positive optical power, its object side is convex, and its image side is concave. The second lens may have a negative optical power, its object side is convex, and its image side is concave. The third lens may have a positive optical power, its object side is convex, and its image side is concave near the optical axis. The fourth lens may have a positive optical power, its object side is convex near the optical axis, and its image side is convex. The fifth lens may have a negative optical power, its object side is concave, and its image side is concave. The sixth lens may have a positive optical power, its object side is concave, and its image side is convex. The seventh lens may have a negative optical power, its object side is concave, and its image side is concave near the optical axis.

[0058] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image.

[0059] In some embodiments, the optical lens may further include a filter, and the filter may be disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0060] In some embodiments, the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -6 < f6 / f7 < -3.5. Meeting the above conditions, by reasonably setting the focal length relationship of the last two lenses, the light can be diverged to a certain extent and the aberration can be effectively corrected, which is beneficial to realizing the large target surface imaging of the lens. At the same time, the system has a longer focal length, meeting the performance characteristics of long focal length and large target surface.

[0061] In some embodiments, the combined focal length f34 of the third lens and the fourth lens and the combined focal length f2345 of the second lens, the third lens, the fourth lens, and the fifth lens satisfy: 0.15 < f34 / f2345 < 0.3. Meeting the above conditions is beneficial to realizing the deflection of light and better realizing the long focal length performance of the system.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.5. By satisfying the above conditions and setting the first lens to have a relatively large positive refractive power, the incident light can be converged to a large extent, and more light can enter the system, which is beneficial to improving the light input of the lens, achieving the large aperture performance of the lens, and enabling the lens to achieve high-definition imaging even in a relatively dark environment.

[0063] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.4 < R1 / R2 < 0.6. By satisfying the above conditions and reasonably setting the meniscus shape of the first lens, as much light as possible can enter the system, enabling the lens to have a relatively wide shooting range.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1.5 < f2 / f < -1.2. The radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 1.8 < R3 / R4 < 2.5. By satisfying the above conditions, the degree of light convergence can be slowed down, which is beneficial to avoiding excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of aberration correction.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 1.2; the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 3 < R6 / f < 20; the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.01 < R5 / R6 < 0.2. By satisfying the above conditions, it is beneficial to further converge the light, enabling the diverging light to smoothly enter the rear optical system and better achieving high-quality imaging of the lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8 < f4 / f < 1.2; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -10 < R7 / R8 < -2. By satisfying the above conditions, it is beneficial to converge the light while reducing the light deflection angle, enabling the light trend to transition smoothly and improving the overall imaging quality.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.5 < f5 / f < -0.9; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -20 < R9 / R10 < -1. By satisfying the above conditions, it is beneficial to slow down the deflection degree of the incident light, avoid excessive aberration caused by overly strong refractive changes, and at the same time is beneficial to balancing various aberrations generated by the front lens group and improving the overall imaging quality.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.5 < f6 / f < 3; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: 2 < R11 / R12 < 10. Meeting the above conditions can effectively improve the aberration of the edge field of view and enhance the overall imaging quality of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.3. Meeting the above conditions is beneficial to increasing the divergence degree of light, increasing the area of light entering the imaging surface, realizing large target surface imaging of the lens, and enhancing the imaging quality of the optical lens.

[0070] In some embodiments, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: -1.2 < R13 / R14 < -0.5. Meeting the above conditions, by reasonably setting the surface shape of the seventh lens, the incident angle of light entering the imaging surface can be increased, enabling the lens to match an imaging chip with a larger CRA and realizing high-definition imaging.

[0071] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0.9 < f3 / f4 < 1.1. Meeting the above conditions is conducive to enabling the diverging light to smoothly enter the rear optical system, reducing the correction difficulty of field curvature and distortion, and improving the overall resolution.

[0072] In some embodiments, the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens satisfy: 0.5 < CT6 / CT7 < 0.9. Meeting the above conditions can reduce the sensitivity of the system performance, while ensuring the lens processing performance and assembly stability, and improving the assembly yield.

[0073] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.2. Meeting the above conditions can effectively limit the length of the lens, which is beneficial to realizing the miniaturization of the optical lens.

[0074] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.8 < TTL / IH < 0.9. Meeting the above conditions can ensure that, under the condition of the same overall length of the lens, it has a larger image surface, can match a larger-sized imaging chip to realize high-definition imaging, and better achieve the balance between the small overall length and the large image surface of the lens.

[0075] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -1 < f1 / f2 < -0.8. Meeting the above conditions, by reasonably setting the focal length relationship of the first two lenses, it helps more light enter the rear optical system, increasing the field of view angle of the lens while improving the overall imaging quality.

[0076] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -2.3 < f1 / f7 < -1.8. Meeting the above conditions, by reasonably setting the focal length relationship of the first and last lenses in the lens, while ensuring that as much light as possible enters the system, it increases the area of light entering the imaging surface, which is beneficial to achieving the balance of a large image surface and a large aperture of the lens.

[0077] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the F-number Fno of the optical lens satisfy: 9mm < IH / Fno < 10mm. Meeting the above conditions is beneficial to increasing the light transmission of the system while achieving large target surface imaging of the lens, enabling the lens to be paired with a 1-inch ultra-large bottom CMOS chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image.

[0078] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 32 < f × (43.27 / IH) < 35. Meeting the above conditions can make the equivalent focal length of the lens have an imaging with a humanistic focal length of nearly 35mm, and the imaging perspective is close to the human eye perspective, which can better highlight the shooting subject, is beneficial to enhancing the natural realism of the imaging picture, and brings a better imaging experience to the user.

[0079] In some embodiments, the combined focal length f34 of the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < f34 / f < 0.6. Meeting the above conditions can make the third and fourth lenses bear more positive refractive power, enabling the diverging light to smoothly enter the rear optical system, reducing the correction difficulty of field curvature and distortion, and improving the overall resolution.

[0080] In some embodiments, the optical lens satisfies the conditional formula: 14.5 mm < TTL < 16 mm, 13 mm < f < 14 mm, 16.5 mm < IH < 18 mm, Fno < 1.9, 60° < FOV < 70°; where TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, Fno represents the aperture value of the optical lens, and FOV represents the maximum field of view angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention can achieve an imaging effect in the near 35 mm humanities focal length range, and the imaging perspective is close to the human eye perspective. It not only has a large target surface, enabling the lens to be paired with a super-large bottom CMOS chip (such as 1 inch), which is beneficial to improving the lens resolution and the detail restoration degree of the image, and achieving imaging with higher pixels; it has a telephoto characteristic, capable of achieving the shooting experience of "zooming in" on distant scenes, which is beneficial to better achieving the shooting effect of a small depth of field, blurring the background and highlighting the subject; it has a large aperture performance, and can achieve high-definition imaging even in a dim environment.

[0081] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. Additionally, when the lens material is glass, due to the low dispersion characteristic of the glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance between the miniaturization of the lens and high image quality.

[0082] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh 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, the sixth lens, and the seventh lens of the present invention can all adopt aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better achieving the miniaturization of the lens.

[0083] In each embodiment of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0084] ;

[0085] Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, B, C, D, E, F, G, H, I, and 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.

[0086] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0087] Example 1

[0088] See also Figure 1 , which is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: an aperture 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, a seventh lens L7 and a filter G1.

[0089] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0090] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0091] The third lens L3 has positive refractive power, its object side surface S5 is convex, and its image side surface S6 is concave near the optical axis;

[0092] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex at the near optical axis, and its image-side surface S8 is convex;

[0093] The fifth lens L5 has negative refractive power, its object-side surface S9 is concave, and its image-side surface S10 is concave;

[0094] The sixth lens L6 has positive refractive power, its object-side surface S11 is concave, and its image-side surface S12 is convex;

[0095] The seventh lens L7 has negative refractive power, its object-side surface S13 is concave, and its image-side surface S14 is concave at the near optical axis;

[0096] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0097] The imaging surface S17 is a plane.

[0098] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspherical lenses.

[0099] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0100] Table 1-1

[0101]

[0102] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0103] Table 1-2

[0104]

[0105] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which indicates the degree of curvature of light in the meridian image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the field angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can correct the field curvature well.

[0106] Figure 3 The F-Tan(θ) distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion of different field angles on the imaging plane, with the horizontal axis representing the distortion value (unit: %) and the vertical axis representing the field angle (unit: °). It can be seen from the figure that the distortion value is controlled within ±1.5%, indicating that the optical lens 100 can correct the distortion well.

[0107] Figure 4 The vertical axis 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 (0.555 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical axis 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 vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0108] Figure 5The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.04mm, indicating that the optical lens 100 can better correct the axial aberration.

[0109] Example 2

[0110] See also Figure 6 , shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0111] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0112] Table 2-1

[0113]

[0114] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0115] Table 2-2

[0116]

[0117] In this embodiment, the field curvature curve, F-Tan (θ) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0118] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can correct the field curvature well.

[0119] from Figure 8 It can be seen that the distortion value is controlled within ±1.5%, indicating that the optical lens 200 can correct the distortion well.

[0120] from Fig. 9 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0121] from Fig.10 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0122] Example 3

[0123] See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

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

[0125] Table 3-1

[0126]

[0127] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130] In this embodiment, the field curvature curve, F-Tan (θ) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0131] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the field curvature well.

[0132] from Fig.13 It can be seen that the distortion value is controlled within ±1.5%, indicating that the optical lens 300 can correct the distortion well.

[0133] from Fig.14 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0134] from Fig.15 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0135] Example 4

[0136] See also Fig.16, shown is a schematic diagram of the structure of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0137] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0138] Table 4-1

[0139]

[0140] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0141] Table 4-2

[0142]

[0143] In this embodiment, the field curvature curve, F-Tan (θ) distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19 , Fig. 20 shown.

[0144] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct the field curvature well.

[0145] from Fig.18 It can be seen that the distortion value is controlled within ±2%, indicating that the optical lens 400 can correct the distortion well.

[0146] from Fig.19 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0147] from Fig. 20 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0148] Please refer to Table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray incident angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0149] Table 5

[0150]

[0151]

[0152] In summary, the optical lens provided by the present invention has at least the following advantages:

[0153] (1) Through specific surface shape settings and reasonable optical focal length distribution, it is possible to achieve an imaging effect close to the 35mm human focal length. The imaging perspective is close to that of the human eye, which can capture a wide scene while retaining sufficient details and depth. When taking photos, it can better highlight the subject, which is conducive to enhancing the natural realism of the imaging picture and bringing a better imaging experience to users.

[0154] (2) The lens has a large aperture, which enables high-definition imaging even in dim environments; it can also realize the large target surface characteristics of the lens and can be matched with a 1-inch ultra-large bottom COMS chip, which is beneficial to improving the lens resolution and image detail restoration.

[0155] (3) The lens has a telephoto feature, which can achieve a shooting experience of "bringing distant scenes closer", which is conducive to better achieving the shooting effect of a small depth of field, blurring the background and highlighting the subject; at the same time, it can also reasonably correct the overall aberration of the optical lens, making the optical lens have high pixels and improving the imaging quality of the optical lens.

[0156] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0157] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, consisting of seven lenses, characterized in that: It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with positive optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is convex and whose image side is concave; A third lens with positive optical power, whose object side is convex and whose image side is concave near the optical axis; A fourth lens with positive optical power, whose object side is convex near the optical axis and whose image side is convex; A fifth lens with negative optical power, whose object side is concave and whose image side is concave; A sixth lens with positive optical power, whose object side is concave and whose image side is convex; A seventh lens with negative optical power, whose object side is concave and whose image side is concave near the optical axis; Wherein, the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -6 < f6 / f7 < -3.5; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0.9 < f3 / f4 < 1.

1.

2. The optical lens according to claim 1, characterized in that: The combined focal length f34 of the third lens and the fourth lens and the combined focal length f2345 of the second lens, the third lens, the fourth lens and the fifth lens satisfy: 0.15 < f34 / f2345 < 0.

3.

3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.5; the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: 0.4 < R1 / R2 < 0.

6.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1.5 < f2 / f < -1.2; 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: 1.8 < R3 / R4 < 2.

5.

5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 1.2; the curvature radius R6 of the image side of the third lens and the effective focal length f of the optical lens satisfy: 3 < R6 / f < 20.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8 < f4 / f < 1.

2.

7. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.5 < f5 / f < -0.9; 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: -20 < R9 / R10 < -1.

8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.5 < f6 / f < 3.

9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.8 < f7 / f < -0.

3.

10. The optical lens according to claim 1, characterized in that: The true 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: 32 < f×(43.27 / IH) < 35.

11. The optical lens according to claim 1, characterized in that: The central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens satisfy: 0.5 < CT6 / CT7 < 0.9.

Images