Optical lens

Abstract

The present invention provides an optical lens, which includes, from the object side to the imaging surface along the optical axis: a first lens with positive optical power, whose object side surface is convex, and whose image side surface is concave at the near optical axis; a second lens with positive optical power, whose object side surface is convex, and whose image side surface is concave; a third lens with positive optical power, whose object side surface is convex; a fourth lens with negative optical power, whose object side surface is concave; a fifth lens with positive optical power, whose object side surface is convex at the near optical axis, and whose image side surface is concave at the near optical axis; a sixth lens with positive optical power, whose object side surface is convex at the near optical axis; a seventh lens with negative optical power, whose object side surface is concave, and whose image side surface is concave at the near optical axis. The optical lens provided by the present invention has one or more advantages such as telephoto 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 near the optical axis;

[0008] The second lens has positive refractive power, its object side surface is convex, and its image side surface is concave;

[0009] a third lens having positive refractive power and a convex object-side surface;

[0010] a fourth lens element having negative optical power and a concave object side surface;

[0011] A fifth lens having positive refractive power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis;

[0012] a sixth lens element having positive refractive power, whose object side surface is convex near the optical axis;

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

[0014] Wherein, 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.

[0015] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 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: 0.3 < R1 / R2 < 0.6.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 40 < f2 / f < 80; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.01 < f1 / f2 < 0.05.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.1 < f3 / f < 1.8.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -1 < f4 / f < -0.6; the curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: -0.7 < R7 / f < -0.3.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2 < f5 / f < 4; 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: 0.6 < R9 / R10 < 0.9.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1 < f6 / f < 1.6; the curvature radius R11 of the object side of the sixth lens and the effective focal length f of the optical lens satisfy: 0.7 < R11 / f < 2.5.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -1 < f7 / f < -0.5.

[0022] Further preferably, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: 1.5 < f5 / f6 < 3; the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -2 < f6 / f7 < -1.2.

[0023] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.25; the total 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: 0.85 < TTL / IH < 1.

[0024] Compared with the prior art, the optical lens provided by the present invention has a large aperture through specific surface shape settings and reasonable optical power distribution, enabling high-definition imaging even in a dim environment; it can also achieve the large target surface characteristic of the lens, and can be paired with a 1-inch ultra-large bottom COMS chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image. In addition, the optical lens of the present invention has a telephoto characteristic, which can achieve the shooting experience of bringing distant scenes closer, is beneficial to better achieving the shooting effect of small depth of field, blurring the background and highlighting the main body; at the same time, it can also reasonably correct the overall aberration of the optical lens, enabling the optical lens to have high pixels and improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0026] Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 2 It is an astigmatism curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 It is an f~tan(θ) distortion curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 It is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 It is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 6 It is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 7 It is an astigmatism curve diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 8 It is an f~tan(θ) distortion curve diagram of the optical lens in Embodiment 2 of the present invention.

[0034] Fig. 9 It is an axial aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0035] Fig.10 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0036] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0037] Fig.12 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0038] Fig.13 4 is a distortion curve diagram of f~tan(θ) of the optical lens in Example 3 of the present invention.

[0039] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0040] Fig.15 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0041] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] The optical lens provided by the embodiment of the present invention is composed of seven lenses, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the imaging surface along the optical axis.

[0050] In some embodiments, the first lens may have a positive focal power, with its object side being convex and its image side being concave near the optical axis. The second lens may have a positive focal power, with its object side being convex and its image side being concave. The third lens may have a positive focal power, with its object side being convex and its image side being either concave or convex. The fourth lens may have a negative focal power, with its object side being concave and its image side being either concave or convex. The fifth lens may have a positive focal power, with its object side being convex near the optical axis and its image side being concave near the optical axis. The sixth lens may have a positive focal power, with its object side being convex near the optical axis and its image side being either concave or convex. The seventh lens may have a negative focal power, with its object side being concave and its image side being concave near the optical axis.

[0051] 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 formation.

[0052] 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 the normal imaging.

[0053] 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. The above condition is the calculation formula of the equivalent focal length. Meeting the above condition can enable the lens to have an imaging with a humanistic focal length of nearly 35mm, and the imaging angle of view is close to the human eye view angle, which can better highlight the shooting theme, is beneficial to improving the natural realism of the imaging picture, and brings a better imaging experience to the user.

[0054] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 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: 0.3 < R1 / R2 < 0.6. Meeting the above conditions, by reasonably setting the focal length and surface type of the first lens, 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, realizing the large aperture performance of the lens, and enabling the lens to have a high-definition imaging even in a relatively dark environment.

[0055] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 40 < f2 / f < 80. 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 < R3 / R4 < 1.1. Meeting the above conditions is beneficial to the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0056] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.01 < f1 / f2 < 0.05. By satisfying the above conditions, through reasonable setting of the focal length relationship of the first two lenses in the lens, while collecting as much light as possible into the system, the light transmission amount of the system is increased, and the large aperture and long focal length performance of the lens are achieved.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.1 < f3 / f < 1.8. The curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < R5 / f < 0.9. By satisfying the above conditions, it is beneficial to reduce the spherical aberration, coma and field curvature generated by the third lens itself, and improve the imaging quality of the optical lens.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -1 < f4 / f < -0.6; the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -0.7 < R7 / f < -0.3. By satisfying the above conditions, it is beneficial to slow down the deflection degree of the incident light, avoid excessive aberration caused by too strong refraction change, and at the same time, it is beneficial to balance various aberrations and distortions generated by the front lens group, and improve the overall imaging quality.

[0059] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2 < f5 / f < 4; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.6 < R9 / R10 < 0.9. By satisfying the above conditions, the spherical aberration contribution of the fifth lens can be controlled within a reasonable range, so that the lens has a high axial imaging resolution ability, which is beneficial to realizing high-definition imaging of the lens.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1 < f6 / f < 1.6; the curvature radius R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 0.7 < R11 / f < 2.5. By satisfying the above conditions, the aberration of the edge field of view can be effectively improved, and the overall imaging quality of the optical lens can be improved.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -1 < f7 / f < -0.5. By satisfying the above conditions, it is beneficial to increase the divergence degree of the light, increase the area of the light entering the imaging surface, realize large target surface imaging of the lens, and improve the imaging quality of the optical lens.

[0062] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: 1.5 < f5 / f6 < 3; the focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -2 < f6 / f7 < -1.2. Meeting the above conditions, by reasonably setting the focal length relationship of the last three lenses in the lens, the incident angle of the chief ray can be effectively increased, which is beneficial to further divergence of light, and large target surface imaging of the lens can be realized.

[0063] 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 < 1.25. Meeting the above conditions can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens.

[0064] 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: 0.85 < TTL / IH < 1. Meeting the above conditions, when the overall length of the lens is the same, it has a larger image plane, can match a larger-sized imaging chip to achieve high-definition imaging, and can better achieve the balance between the small overall length and the large image plane of the lens.

[0065] In some embodiments, the overall optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy: 7.5 < TTL / BFL < 9. The back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.1 < BFL / f < 0.2. Meeting the above conditions can make the lens have an appropriate back focus, ensure the compatibility between the lens and the fuselage, and make the structure of the lens more compact.

[0066] In some embodiments, 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: 1.2 < IH / f < 1.35. Meeting the above conditions can endow the optical lens with the characteristics of a large image plane and a long focal length, which is beneficial to better achieving the portrait shooting effect with a small depth of field, blurring the background and highlighting the subject.

[0067] In some embodiments, the curvature radius R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: -2.5 < R13 / f < -0.5; the curvature radius R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < R14 / f < 2. Meeting the above conditions is beneficial to increasing the incident angle of light entering the image plane, enabling the lens to better match an imaging chip with a large CRA (chief ray incident angle) to achieve high-definition imaging; at the same time, it is beneficial to increasing the imaging area of the lens and realizing large target surface imaging of the lens.

[0068] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -2.5 < f3 / f4 < -1.3. Meeting the above conditions is beneficial to the smooth transition of light, while correcting various aberrations of the optical lens and improving the imaging quality of the optical lens.

[0069] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -2 < f1 / f7 < -1.2. The sagittal height SAG71 of the object-side clear aperture semi-diameter of the seventh lens and the sagittal height SAG72 of the image-side clear aperture semi-diameter of the seventh lens satisfy: 1.2 < SAG71 / SAG72 < 1.5. Meeting the above conditions, by reasonably setting the focal length and surface shape relationship of the first and last lenses in the lens, while ensuring that as much light as possible enters the system, the area of light entering the imaging surface is increased, which is beneficial to achieving large image plane imaging of the lens, and at the same time increasing the light input, achieving large aperture imaging of the lens.

[0070] 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: 8.5 mm < IH / Fno < 9.5 mm. Meeting the above conditions is beneficial to increasing the light throughput of the system and achieving large target plane imaging of the lens, enabling the lens to be paired with a super-large bottom CMOS chip of 1 inch, which is beneficial to improving the lens resolution and the detail restoration degree of the image.

[0071] In some embodiments, the object-side clear aperture semi-diameter DM11 of the first lens and the object-side clear aperture semi-diameter DM31 of the third lens satisfy: 1.15 < DM11 / DM31 < 1.4; the image-side clear aperture semi-diameter DM72 of the seventh lens and the object-side clear aperture semi-diameter DM31 of the third lens satisfy: 2 < DM71 / DM31 < 2.4. Meeting the above conditions can make the lens have a smaller aperture size, facilitating it to be mounted on the terminal device in a periscope form, meeting the development trend of the thinning of electronic products.

[0072] In some embodiments, the optical lens satisfies the conditional formula: 15 mm < TTL < 16 mm, 12 mm < f < 14 mm, 16 mm < IH < 17.5 mm, Fno < 1.9, 60° < FOV < 70°; where TTL represents the overall 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 bringing distant scenes closer, which is beneficial to better achieving the shooting effect of 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.

[0073] 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.

[0074] 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.

[0075] In various embodiments 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:

[0076] ;

[0077] 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, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients respectively.

[0078] 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.

[0079] Example 1

[0080] 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.

[0081] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave at the near optical axis;

[0082] The second lens L2 has positive refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0083] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex;

[0084] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0085] The fifth lens L5 has positive refractive power, an object-side surface S9 thereof is convex at the near optical axis, and an image-side surface S10 thereof is concave at the near optical axis;

[0086] The sixth lens L6 has positive refractive power, its object-side surface S11 is convex at the near optical axis, and its image-side surface S12 is convex;

[0087] 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;

[0088] The object side surface S15 and the image side surface S16 of the filter G1 are both planes;

[0089] The imaging surface S17 is a plane.

[0090] 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.

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

[0092] Table 1-1

[0093]

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

[0095] Table 1-2

[0096]

[0097] Figure 2 The astigmatism curve of the optical lens 100 in this embodiment is shown, which represents the astigmatism of light in the meridian image plane and the sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the astigmatism of the meridian image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can correct the astigmatism well.

[0098] 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 ±2%, indicating that the optical lens 100 can correct the distortion well.

[0099] Figure 4 The 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 ±0.05mm, indicating that the optical lens 100 can correct the axial aberration well.

[0100] Figure 5The 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 ±1.5 μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0101] Example 2

[0102] 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 differences of this embodiment are: the image side surface S6 of the third lens L3 is a concave surface at the near optical axis; the image side surface S8 of the fourth lens is a concave surface at the near optical axis; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0103] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0104] Table 2-1

[0105]

[0106] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0107] Table 2-2

[0108]

[0109] In this embodiment, the astigmatism curve, f-tan (θ) distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 , Fig.10 shown.

[0110] from Figure 7 It can be seen that the astigmatism 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 astigmatism well.

[0111] from Figure 8 It can be seen that the distortion value is controlled within ±2%, indicating that the optical lens 200 can correct the distortion well.

[0112] from Fig. 9 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.

[0113] from Fig.10 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.

[0114] Example 3

[0115] 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 differences of this embodiment are: the image side surface S6 of the third lens L3 is a concave surface at the near optical axis; the image side surface S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0116] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0117] Table 3-1

[0118]

[0119] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0120] Table 3-2

[0121]

[0122] In this embodiment, the astigmatism curve, f-tan (θ) distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 , Fig.15 shown.

[0123] from Fig.12 It can be seen that the astigmatism 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 astigmatism well.

[0124] from Fig.13 It can be seen that the distortion value is controlled within ±2%, indicating that the optical lens 300 can correct the distortion well.

[0125] from Fig.14 It can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0126] from Fig.15 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.

[0127] Please refer to Table 4, 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.

[0128] Table 4

[0129]

[0130] In summary, the optical lens provided by the present invention has at least the following advantages:

[0131] (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.

[0132] (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.

[0133] (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.

[0134] 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.

[0135] 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 near the optical axis; A second lens with positive 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; A fourth lens with negative optical power, whose object side is concave; A fifth lens with positive optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A sixth lens with positive optical power, whose object side is convex near the optical axis; A seventh lens with negative optical power, whose object side is concave and whose image side is concave near the optical axis; Wherein, 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.

2. 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 < 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: 0.3 < R1 / R2 < 0.

6.

3. 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: 40 < f2 / f < 80; The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.01 < f1 / f2 < 0.

05.

4. 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: 1.1 < f3 / f < 1.

8.

5. 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: -1 < f4 / f < -0.6; The curvature radius R7 of the object side of the fourth lens and the effective focal length f of the optical lens satisfy: -0.7 < R7 / f < -0.

3.

6. 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: 2 < f5 / f < 4; 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: 0.6 < R9 / R10 < 0.

9.

7. 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: 1 < f6 / f < 1.6; The curvature radius R11 of the object side of the sixth lens and the effective focal length f of the optical lens satisfy: 0.7 < R11 / f < 2.

5.

8. 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: -1 < f7 / f < -0.

5.

9. The optical lens according to claim 1, characterized in that: The focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: 1.5 < f5 / f6 < 3; The focal length f6 of the sixth lens and the focal length f7 of the seventh lens satisfy: -2 < f6 / f7 < -1.

2.

10. The optical lens according to claim 1, characterized in that: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.25; 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: 0.85 < TTL / IH < 1.

Images