High-pixel camera lens

Abstract

The invention discloses a high-pixel pick-up lens which comprises a first lens element with negative refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with negative refractive power, a fifth lens element with negative refractive power, a fifth lens element with negative refractive power, a sixth lens element with negative refractive power, a fifth lens element with negative refractive power, and a sixth lens element with negative refractive power, the second lens element with positive refractive power has an object-side surface being convex in the vicinity of the optical axis and an image-side surface being concave in the vicinity of the optical axis. The third lens element with positive refractive power has an object-side surface being convex in the vicinity of the optical axis and an image-side surface being convex in the vicinity of the optical axis. The fourth lens has negative refractive power, and at least one surface of the fourth lens is a concave surface in an area near the optical axis; the fifth lens has positive refractive power, and at least one surface of the fifth lens is a convex surface in an area near the optical axis; the sixth lens element with negative refractive power has an object-side surface being convex in the vicinity of the optical axis and an image-side surface being concave in the vicinity of the optical axis. The seventh lens element with positive refractive power has an object-side surface being convex in the vicinity of the optical axis and having an inflection point outside the optical axis, and an image-side surface being concave in the vicinity of the optical axis. According to the high-pixel camera lens, high pixel, wide angle, small distortion, small CRA and large target surface of the lens can be realized at the same time.

Description

Technical Field

[0001] This invention relates to the field of optical lenses, and more particularly to a high-pixel camera lens. Background Technology

[0002] In recent years, with the rapid development of technology, the camera function of electronic devices has become one of the core selling points that users pay attention to. Users have increasingly stringent requirements for the performance of camera lenses, pursuing the wide field of view brought by wide-angle shooting, expecting the lens to have high pixel characteristics to ensure clear and sharp image details, and also requiring effective control of optical distortion to ensure the realism of the image and avoid problems such as stretching and distortion.

[0003] In lens design, to achieve wide-angle shooting, the angle of light entering the lens needs to be increased. However, this design often leads to two major problems: First, the angle of incidence of the principal ray (CRA) increases. When the lens's CRA is much larger than the image sensor's CRA, light is easily refracted to adjacent pixels, causing color difference between pixels. This problem is more pronounced around the edges of the image, seriously affecting the uniformity of the image color. Second, optical distortion is aggravated. If the distortion of a wide-angle lens is not effectively controlled, it will distort the shape of the imaged object, reducing the practical value of the image.

[0004] Furthermore, the size of the target surface plays a crucial role in image quality. A larger target surface can capture more light, which not only widens the field of view but also enhances image detail, thereby improving image quality. However, in practical design, achieving the technical goals of high resolution, wide angle, low distortion, small CRA, and large target surface simultaneously presents many challenges. Existing optical camera lenses cannot fully meet these performance requirements and cannot provide users with an ideal shooting experience. Summary of the Invention

[0005] To address the shortcomings of the prior art, this invention provides a high-resolution camera lens composed of seven lenses. By rationally designing the refractive power, surface shape, and parameters of the seven lenses, the lens simultaneously achieves high resolution, wide angle, low distortion, small CRA, and a large target surface.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solution:

[0007] A high-resolution camera lens, comprising, along the optical axis from the object side to the imaging plane, the following components in sequence:

[0008] A first lens, having negative refractive power, wherein its object-side surface is concave in the region near the optical axis and has an extreme point outside the optical axis, and its image-side surface is concave in the region near the optical axis;

[0009] A second lens, the second lens having a positive refractive power, its object side being convex in the region near the optical axis and its image side being concave in the region near the optical axis;

[0010] A third lens, the third lens having a positive refractive power, its object side being convex in the region near the optical axis and its image side being convex in the region near the optical axis;

[0011] A fourth lens, the fourth lens having a negative refractive power, at least one of its surfaces being concave in the region near the optical axis;

[0012] A fifth lens, the fifth lens having a positive refractive power, at least one of its surfaces being convex in the region near the optical axis;

[0013] A sixth lens, the sixth lens having a negative refractive power, its object side being convex in the region near the optical axis and its image side being concave in the region near the optical axis;

[0014] A seventh lens, the seventh lens having a positive refractive power, its object side being convex in the region near the optical axis and having an anastigmatic point outside the optical axis, and its image side being concave in the region near the optical axis;

[0015] Wherein, the focal length f1 of the first lens and the effective focal length f of the high - pixel camera lens satisfy: - 0.8 < f / f1 < - 0.5; the focal length f7 of the seventh lens and the effective focal length f of the high - pixel camera lens satisfy: 0.2 < f / f7 < 1.25.

[0016] Further, the overall optical length TTL of the high - pixel camera lens, the maximum field - of - view angle FOV of the high - pixel camera lens, and the true image height IH corresponding to the maximum field - of - view angle FOV satisfy: - 0.2 < (IH * cosFOV) / TTL < - 0.01.

[0017] Further, the true image height IH corresponding to the maximum field - of - view angle of the high - pixel camera lens and the effective focal length f of the high - pixel camera lens satisfy: 1.3 < IH / f < 1.5; the overall optical length TTL, the maximum field - of - view angle FOV, and the true image height IH corresponding to the maximum field - of - view angle of the high - pixel camera lens satisfy: 4.3 < 180° * TTL / (IH * FOV) < 4.9; the effective focal length f, the maximum field - of - view angle FOV, and the true image height IH corresponding to the maximum field - of - view angle FOV of the high - pixel camera lens satisfy: 74° < f * FOV / IH < 77°.

[0018] Further, the total optical length TTL and the back focal length BFL of the high - pixel camera lens satisfy: 4.5 < TTL / BFL < 6.0; the maximum field of view FOV of the high - pixel camera lens and the chief ray angle of incidence CRA at the maximum image height of the high - pixel camera lens satisfy: 8.60 < FOV / (CRA / 2) < 9.05.

[0019] Further, the central thickness ct1 of the first lens, the central thickness ct2 of the second lens, the central thickness ct6 of the sixth lens, and the central thickness ct7 of the seventh lens satisfy: 0.4 < (ct6 + ct7) / (ct1 + ct2) < 0.8.

[0020] Further, the object - side sagittal height sagf71 and the image - side sagittal height sagf72 of the seventh lens satisfy: 0.35 < sagf71 / sagf72 < 1; the image - side curvature radius R12 of the first lens, the object - side curvature radius R71 of the seventh lens, and the image - side curvature radius R72 of the seventh lens satisfy: 0.2 < R12 / (R71*R72) < 1.3.

[0021] Further, the refractive index Nd7 of the material of the seventh lens satisfies: 1.50 < Nd7 < 1.65; the Abbe number Vd7 of the material of the seventh lens satisfies: 30 < Vd7 < 60.

[0022] Further, the f - number Fno of the high - pixel camera lens, the back focal length BFL of the high - pixel camera lens, and the image - side diameter sd7 of the seventh lens satisfy: 0.6 < Fno*BFL / sd7 < 0.9; the f - number Fno of the high - pixel camera lens and the entrance pupil diameter EPD satisfy: 0.8 < EPD / Fno < 1.0.

[0023] Further, among the first lens to the seventh lens, at least five lenses are plastic aspherical lenses.

[0024] Further, the high - pixel camera lens further includes an aperture and a filter. The aperture is disposed between the second lens and the third lens, and the filter is disposed between the seventh lens and the imaging surface.

[0025] The present invention has the following beneficial effects: The high - definition camera lens of the present invention combines seven lenses with specific refractive powers and surface types, and with reasonable parameter design, effectively solves the problem that it is difficult to simultaneously achieve high pixels, wide - angle, small distortion, small CRA, and large target surface in the prior art. This lens can be widely applied to electronic devices such as smart phones, tablet computers, laptop computers, video conferencing devices, etc., providing users with a high - quality shooting experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the high-definition camera lens in Embodiment 1 of the present invention.

[0027] Figure 2 This is the field curvature curve of the high-definition camera lens in Embodiment 1 of the present invention.

[0028] Figure 3 This is the distortion curve of the high-definition camera lens in Embodiment 1 of the present invention.

[0029] Figure 4 This is the MTF curve of the high-definition camera lens in Embodiment 1 of the present invention.

[0030] Figure 5 This is a schematic diagram of the structure of the high-definition camera lens in Embodiment 2 of the present invention.

[0031] Figure 6 This is the field curvature curve of the high-definition camera lens in Embodiment 2 of the present invention.

[0032] Figure 7 This is the distortion curve of the high-definition camera lens in Embodiment 2 of the present invention.

[0033] Figure 8 This is the MTF curve of the high-definition camera lens in Embodiment 2 of the present invention.

[0034] Figure 9 This is a schematic diagram of the structure of the high-definition camera lens in Embodiment 3 of the present invention.

[0035] Figure 10 This is the field curvature curve of the high-definition camera lens in Embodiment 3 of the present invention.

[0036] Figure 11 This is the distortion curve of the high-definition camera lens in Embodiment 3 of the present invention.

[0037] Figure 12 This is the MTF curve of the high-definition camera lens in Embodiment 3 of the present invention.

[0038] Figure 13 This is a schematic diagram of the structure of the high-definition camera lens in Embodiment 4 of the present invention.

[0039] Figure 14 This is the field curvature curve of the high-definition camera lens in Embodiment 4 of the present invention.

[0040] Figure 15 This is the distortion curve of the high-definition camera lens in Embodiment 4 of the present invention.

[0041] Figure 16 This is the MTF curve of the high-definition camera lens in Embodiment 4 of the present invention. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, "multiple" means two or more, unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] A high-resolution camera lens, comprising, along the optical axis from the object side to the imaging plane, the following components in sequence:

[0047] A first lens, having negative refractive power, wherein its object-side surface is concave in the region near the optical axis and has an extreme point outside the optical axis, and its image-side surface is concave in the region near the optical axis;

[0048] The second lens has positive refractive power, its object side is convex in the region near the optical axis, and its image side is concave in the region near the optical axis.

[0049] The third lens has positive refractive power, and its object side is convex in the region near the optical axis, and its image side is convex in the region near the optical axis.

[0050] The fourth lens, which has a negative refractive power and at least one surface is concave in the region near the optical axis;

[0051] The fifth lens, which has a positive refractive power and at least one surface is convex in the region near the optical axis;

[0052] The sixth lens, which has a negative refractive power, its object side surface is convex in the region near the optical axis, and its image side surface is concave in the region near the optical axis;

[0053] The seventh lens, which has a positive refractive power, its object side surface is convex in the region near the optical axis and has an anastigmatic point outside the optical axis, and its image side surface is concave in the region near the optical axis;

[0054] Wherein, the focal length f1 of the first lens and the effective focal length f of the high-pixel camera lens satisfy: -0.8 < f / f1 < -0.5; the focal length f7 of the seventh lens and the effective focal length f of the high-pixel camera lens satisfy: 0.2 < f / f7 < 1.25.

[0055] The first lens can effectively diverge the incident light, laying a foundation for the light convergence and aberration correction of the subsequent lens group. The setting of its off-axis extreme point helps to optimize the propagation path of the large-field light and reduce the off-axis field aberration; the second lens can preliminarily converge the light diverged by the first lens. Its convex object side surface is beneficial for receiving large-angle incident light, and its concave image side surface can adjust the light propagation direction to optimize the beam shape; the double-convex surface structure of the third lens has a strong convergence ability, can compress the beam aperture, thereby improving the light utilization rate, and at the same time helps to correct the aberrations generated by the first lens and the second lens; the fourth lens can appropriately diverge the over-converged light, balance the lens focal power. The setting of its concave surface can specifically correct the spherical aberration and chromatic aberration in the system and improve the imaging quality; the fifth lens can continue to converge the light, ensuring that the light is accurately directed to the subsequent lens. Its convex structure helps to improve the light convergence efficiency and at the same time assist in correcting the remaining aberrations; the sixth lens can further fine-tune the light propagation direction and optimize the distribution of the beam on the imaging surface. Its concave image side surface is beneficial for controlling the incident angle of the edge field light and reducing distortion; the seventh lens can accurately focus the light on the imaging surface. The design of its off-axis anastigmatic point can effectively control the chief ray angle of incidence (CRA), avoid crosstalk of light on the surface of the image sensor, and its concave image side surface helps to improve the illuminance uniformity at the edge of the imaging surface.

[0056] Through the cooperation among the focal length f1 of the first lens, the focal length f7 of the seventh lens, and the effective focal length f of the high-pixel camera lens, the lens has sufficient refractive power, making it easier to suppress the incident angle of the chief ray. Meanwhile, the higher-order aberrations generated by the lens are corrected, enabling the lens to obtain high imaging performance. Additionally, the first lens has a negative optical power, which can effectively diverge the incident light to achieve a wide-angle effect and avoid excessive accumulation of aberrations due to excessive optical power. The seventh lens has a positive optical power, which converges the light and can avoid the loss of light energy caused by too large an incident angle of the chief ray when the light in the large field of view reaches the imaging surface, facilitating the improvement of the illuminance of the edge field of view and taking into account the technical requirements of a large target surface and a small CRA.

[0057] In some examples, the overall optical length TTL of the high-pixel camera lens (the distance from the object side surface of the first lens to the imaging surface on the optical axis), the maximum field of view FOV of the high-pixel camera lens, and the true image height IH corresponding to the maximum field of view FOV (half of the diagonal length of the effective pixel area of the image sensor on the imaging surface) satisfy: -0.2 < (IH * cos FOV) / TTL < -0.01.

[0058] Through the cooperation among the overall optical length TTL, the maximum field of view FOV, and the true image height IH, the lens has a larger target surface size to adapt to a larger-sized image sensor, and the imaging quality is better. Meanwhile, it has a larger field of view, which can effectively limit the length of the lens to ensure a smaller overall optical length of the lens while achieving wide-angleization.

[0059] In some examples, the true image height IH corresponding to the maximum field of view of the high-pixel camera lens and the effective focal length f of the high-pixel camera lens satisfy: 1.3 < IH / f < 1.5; the overall optical length TTL of the high-pixel camera lens, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view satisfy: 4.3 < 180° * TTL / (IH * FOV) < 4.9; the effective focal length f of the high-pixel camera lens, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view FOV satisfy: 74° < f * FOV / IH < 77°.

[0060] Through the cooperation between the true image height IH and the effective focal length f, a large target surface size is ensured to enhance imaging details and the field of view. Additionally, through the cooperation among the overall optical length TTL, the maximum field of view FOV, and the true image height IH, the overall length, image height, and field of view can be balanced to optimize the practicality of the lens. Meanwhile, through the cooperation among the effective focal length f, the maximum field of view FOV, and the true image height IH, the imaging ratio can be ensured to be coordinated at different field of view angles.

[0061] In some examples, the total optical length TTL and the back focal length BFL of the high-pixel camera lens satisfy: 4.5 < TTL / BFL < 6.0; the maximum field of view FOV of the high-pixel camera lens and the chief ray angle of incidence CRA at the maximum image height of the high-pixel camera lens satisfy: 8.60 < FOV / (CRA / 2) < 9.05.

[0062] Through the cooperation between the total optical length TTL and the back focal length BFL, space is reserved for the installation and focusing of optical elements, avoiding mechanical interference, and balancing the lens total length and functional stability; in addition, through the cooperation between the maximum field of view FOV and the chief ray angle of incidence CRA, the CRA is reduced on the basis of wide-angle shooting, avoiding chromatic aberration.

[0063] In some examples, the central thickness ct1 of the first lens, the central thickness ct2 of the second lens, the central thickness ct6 of the sixth lens, and the central thickness ct7 of the seventh lens satisfy: 0.4 < (ct6 + ct7) / (ct1 + ct2) < 0.8.

[0064] Through the cooperation between the central thickness ct1 of the first lens, the central thickness ct2 of the second lens, the central thickness ct6 of the sixth lens, and the central thickness ct7 of the seventh lens, the light deflection can be made gentle, reducing the sensitivity to assembly errors and improving the assembly yield.

[0065] In some examples, the object-side sagittal height sagf71 and the image-side sagittal height sagf72 of the seventh lens satisfy: 0.35 < sagf71 / sagf72 < 1; the image-side curvature radius R12 of the first lens, the object-side curvature radius R71 of the seventh lens, and the image-side curvature radius R72 of the seventh lens satisfy: 0.2 < R12 / (R71 * R72) < 1.3.

[0066] Through the cooperation between the object-side sagittal height sagf71 and the image-side sagittal height sagf72 of the seventh lens, the optical path can be extended to achieve the coordination of small CRA and large target surface; at the same time, through the cooperation between the image-side curvature radius R12 of the first lens, the object-side curvature radius R71 of the seventh lens, and the image-side curvature radius R72 of the seventh lens, the bending degrees of the image side of the first lens, the object side and the image side of the seventh lens can be effectively controlled. In addition to reducing the aberration generated by excessive lens surface curvature, it is more effective to correct the spherical aberration of the lens, and at the same time make the surface shape of the seventh lens smooth and uniform, which is more conducive to processing.

[0067] In some examples, the refractive index Nd7 of the material of the seventh lens satisfies: 1.50 < Nd7 < 1.65; the Abbe number Vd7 of the material of the seventh lens satisfies: 30 < Vd7 < 60.

[0068] The refractive index Nd7 of the material of the seventh lens is 1.5 - 1.6, and the Abbe number Vd7 is 55 - 65. It has the advantage of a low dispersion coefficient, which can reduce the difficulty of chromatic aberration correction and improve color restoration.

[0069] In some examples, the aperture value Fno of the high - pixel camera lens, the back focal length BFL of the high - pixel camera lens, and the image - side diameter sd7 of the seventh lens satisfy: 0.6 < Fno * BFL / sd7 < 0.9; the aperture value Fno of the high - pixel camera lens and the entrance pupil diameter EPD satisfy: 0.8 < EPD / Fno < 1.0.

[0070] Through the cooperation among the aperture value Fno, the back focal length BFL, and the image - side diameter sd7 of the seventh lens, the noise in low - light environments can be reduced, the imaging quality can be improved, enabling the lens to meet the imaging requirements under different light fluxes. It also reserves space for the installation and focusing of optical elements, avoiding mechanical interference, and balancing the total length of the lens and functional stability; the aperture value Fno and the entrance pupil diameter EPD satisfy 0.8 < EPD / Fno < 1.0, which can ensure sufficient light input to further reduce the noise in low - light environments.

[0071] In some examples, among the first lens to the seventh lens, at least five lenses are plastic aspherical lenses.

[0072] The aspherical structure can effectively reduce the number of lenses, simplify the lens structure, while greatly correcting the system aberration, improving the imaging quality, and maintaining a good imaging effect within a larger field of view.

[0073] In some instances, the high - pixel camera lens further includes an aperture stop and a filter. The aperture stop can be disposed between the second lens and the third lens to limit the light input and optimize the aberration; the filter is disposed between the seventh lens and the imaging surface to filter out interfering light.

[0074] The high - pixel camera lens of the present invention is described in detail below through four specific embodiments. The parameters such as the radius of curvature, central thickness, refractive index, Abbe number, and aspherical coefficient of the lenses in each embodiment are different, but all fall within the protection scope of the claims of the present invention.

[0075] Embodiment 1

[0076] As Figure 1 shown, the high - pixel camera lens of this embodiment includes, in order from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G; where

[0077] The first lens L1 has negative refractive power, the object side S1 (paraxial region) is concave and has an extreme point off-axis, the image side S2 (paraxial region) is concave, and it is made of plastic aspherical material.

[0078] The second lens L2 has positive refractive power, with the object-side surface S3 (paraxial region) being convex and the image-side surface S4 (paraxial region) being concave, and is made of aspherical plastic material.

[0079] The third lens L3 has positive refractive power, with the object-side surface S5 (paraxial region) being convex and the image-side surface S6 (paraxial region) being convex. It is made of molded glass aspherical material.

[0080] The fourth lens L4 has negative refractive power, with the object-side surface S7 (paraxial region) being concave and the image-side surface S8 (paraxial region) being concave. It is made of aspherical plastic material.

[0081] The fifth lens L5 has positive refractive power. The object-side surface S9 (paraxial region) is convex, and the image-side surface S10 (paraxial region) is convex. It is made of aspherical plastic material.

[0082] The sixth lens L6 has negative refractive power. The object-side surface S11 (paraxial region) is convex, and the image-side surface S12 (paraxial region) is concave. It is made of aspherical plastic material.

[0083] The seventh lens L7 has positive refractive power. The object side S13 (paraxial region) is convex and has an inflection point off-axis, while the image side S14 (paraxial region) is concave. It is made of aspherical plastic material.

[0084] The relevant parameters of each lens, aperture, and filter of the high-pixel camera lens in this embodiment are shown in Table 1-1:

[0085] Table 1-1 (Unit: mm, except for refractive index Nd and Abbe number Vd)

[0086]

[0087]

[0088] In this embodiment, the surface shape parameters of the aspherical surfaces of each lens of the high-pixel camera lens are shown in Table 1-2 (where K is the quadratic surface coefficient, and A4-A24 are the aspherical coefficients of the corresponding orders):

[0089] Table 1-2

[0090]

[0091]

[0092]

[0093] Please see Figure 2-4 These are the field curvature curve, distortion curve, and MTF curve of the high-pixel camera lens in this embodiment, respectively.

[0094] Field curvature curve ( Figure 2 The field curvature offset of the meridional image plane (Tan) is controlled between -0.05mm and 0.02mm, and the field curvature offset of the sagittal image plane (Sag) is controlled between -0.05mm and 0.01mm. This indicates that the lens has excellent field curvature correction effect, the image surface is flat, and the difference in sharpness between the edge and center of the image can be effectively avoided.

[0095] Distortion curve ( Figure 3 The distortion value is controlled within 0-5%, which meets the design goal of small distortion and can ensure that the shape of the imaged object is real without obvious stretching or compression deformation.

[0096] MTF curve ( Figure 4 At a spatial frequency of 110 lp / mm, the MTF value of each field of view is greater than 0.4, indicating that the lens has high-resolution imaging capability, can meet the high pixel requirements, and the image details are clear and sharp.

[0097] The key optical characteristics of the high-resolution camera lens in this embodiment are shown in Table 1-3:

[0098] Table 1-3

[0099]

[0100]

[0101] The key parameter ratios of the high-pixel lens in this embodiment are shown in Table 1-4:

[0102] Table 1-4

[0103] Key ratio Calculation results Key ratio Calculation results f / f1 -0.75 FOV / (CRA / 2) 8.63 f / f7 0.38 (ct6+ct7) / (ct1+ct2) 0.57 (IH*cosFOV) / TTL -0.10 sagf71 / sagf72 0.60 IH / f 1.39 R12 / (R71*R72) 0.25 180°*TTL / (IH*FOV) 4.72 Nd7 1.54 f*FOV / IH 76.77° Vd7 56.00 TTL / BFL 5.14 Fno*BFL / sd7 0.82 EPD / Fno 0.82

[0104] Example 2

[0105] like Figure 5 As shown, the high-resolution camera lens of this embodiment includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G; wherein,

[0106] The first lens L1 has negative refractive power, the object side S1 (paraxial region) is concave and has an extreme point off-axis, the image side S2 (paraxial region) is concave, and it is made of plastic aspherical material.

[0107] The second lens L2 has positive refractive power, with the object-side surface S3 (paraxial region) being convex and the image-side surface S4 (paraxial region) being concave, and is made of aspherical plastic material.

[0108] The third lens L3 has positive refractive power, with the object-side surface S5 (paraxial region) being convex and the image-side surface S6 (paraxial region) being convex, and is made of aspherical plastic material;

[0109] The fourth lens L4 has negative refractive power, with the object-side surface S7 (paraxial region) being convex and the image-side surface S8 (paraxial region) being concave, and is made of aspherical plastic material.

[0110] The fifth lens L5 has positive refractive power. The object-side surface S9 (paraxial region) is convex, and the image-side surface S10 (paraxial region) is convex. It is made of aspherical plastic material.

[0111] The sixth lens L6 has negative refractive power. The object-side surface S11 (paraxial region) is convex, and the image-side surface S12 (paraxial region) is concave. It is made of aspherical plastic material.

[0112] The seventh lens L7 has positive refractive power. The object side S13 (paraxial region) is convex and has an inflection point off-axis, while the image side S14 (paraxial region) is concave. It is made of aspherical plastic material.

[0113] The relevant parameters of each lens, aperture, and filter of the high-pixel camera lens in this embodiment are shown in Table 2-1:

[0114] Table 2-1 (Unit: mm, except for refractive index Nd and Abbe number Vd)

[0115]

[0116]

[0117] In this embodiment, the surface shape parameters of the aspherical surfaces of each lens of the high-pixel camera lens are shown in Table 2-2 (where K is the quadratic surface coefficient, and A4-A24 are the aspherical coefficients of the corresponding orders):

[0118] Table 2-2

[0119]

[0120]

[0121] See Figure 6-8 These are the field curvature curve, distortion curve, and MTF curve of the high-pixel camera lens in this embodiment, respectively.

[0122] Field curvature curve ( Figure 6The field curvature offset of the meridional image plane (Tan) is controlled between -0.02mm and 0.01mm, and the field curvature offset of the sagittal image plane (Sag) is controlled between -0.05mm and 0.01mm. This indicates that the lens has excellent field curvature correction effect, the image surface is flat, and the difference in sharpness between the edge and center of the image can be effectively avoided.

[0123] Distortion curve ( Figure 7 The distortion value is controlled within 0 to 3%, which meets the design goal of small distortion and can ensure that the shape of the imaged object is real without obvious stretching or compression deformation.

[0124] MTF curve ( Figure 8 At a spatial frequency of 110 lp / mm, the MTF value of each field of view is greater than 0.3, indicating that the lens has high-resolution imaging capability, can meet the high pixel requirements, and the image details are clear and sharp.

[0125] The key optical characteristics of the high-resolution camera lens in this embodiment are shown in Table 2-3:

[0126] Table 2-3

[0127]

[0128]

[0129] The key parameter ratios of the high-pixel camera lens in this embodiment are shown in Table 2-4:

[0130] Table 2-4

[0131] Key ratio Calculation results Key ratio Calculation results f / f1 -0.73 FOV / (CRA / 2) 8.84 f / f7 0.31 (ct6+ct7) / (ct1+ct2) 0.55 (IH*cosFOV) / TTL -0.13 sagf71 / sagf72 0.67 IH / f 1.48 R12 / (R71*R72) 0.36 180°*TTL / (IH*FOV) 4.42 Nd7 1.54 f*FOV / IH 74.92° Vd7 56.00 TTL / BFL 5.00 Fno*BFL / sd7 0.74 EPD / Fno 0.99

[0132] Example 3

[0133] like Figure 9 As shown, the high-resolution camera lens of this embodiment includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G; wherein,

[0134] The first lens L1 has negative refractive power, the object side S1 (paraxial region) is concave and has an extreme point off-axis, the image side S2 (paraxial region) is concave, and it is made of plastic aspherical material.

[0135] The second lens L2 has positive refractive power, with the object-side surface S3 (paraxial region) being convex and the image-side surface S4 (paraxial region) being concave, and is made of aspherical plastic material.

[0136] The third lens L3 has positive refractive power, with the object-side surface S5 (paraxial region) being convex and the image-side surface S6 (paraxial region) being convex, and is made of aspherical plastic material;

[0137] The fourth lens L4 has negative refractive power, with the object-side surface S7 (paraxial region) being convex and the image-side surface S8 (paraxial region) being concave, and is made of aspherical plastic material.

[0138] The fifth lens L5 has positive refractive power, with the object-side surface S9 (paraxial region) being convex and the image-side surface S10 (paraxial region) being convex. It is made of molded glass aspherical material.

[0139] The sixth lens L6 has negative refractive power. The object-side surface S11 (paraxial region) is convex, and the image-side surface S12 (paraxial region) is concave. It is made of aspherical plastic material.

[0140] The seventh lens L7 has positive refractive power. The object side S13 (paraxial region) is convex and has an inflection point off-axis, while the image side S14 (paraxial region) is concave. It is made of molded glass aspherical material.

[0141] The relevant parameters of each lens, aperture, and filter of the high-pixel camera lens in this embodiment are shown in Table 3-1:

[0142] Table 3-1 (Unit: mm, except for refractive index Nd and Abbe number Vd)

[0143]

[0144]

[0145] In this embodiment, the surface shape parameters of the aspherical surfaces of each lens of the high-pixel camera lens are shown in Table 3-2 (where K is the quadratic surface coefficient, and A4-A24 are the aspherical coefficients of the corresponding orders):

[0146] Table 3-2

[0147]

[0148]

[0149] See Figure 10-12 These are the field curvature curve, distortion curve, and MTF curve of the high-pixel camera lens in this embodiment, respectively.

[0150] Field curvature curve ( Figure 10The field curvature offset of the meridional image plane (Tan) is controlled between -0.01mm and 0.03mm, and the field curvature offset of the sagittal image plane (Sag) is controlled between 0mm and 0.05mm. This indicates that the lens has excellent field curvature correction effect, the image surface is flat, and the difference in sharpness between the edge and center of the image can be effectively avoided.

[0151] Distortion curve ( Figure 11 The distortion value is controlled within 0 to 6%, which meets the design goal of small distortion and can ensure that the shape of the imaged object is real without obvious stretching or compression deformation.

[0152] MTF curve ( Figure 12 At a spatial frequency of 110 lp / mm, the MTF value of each field of view is greater than 0.5, indicating that the lens has high-resolution imaging capability, can meet the high pixel requirements, and the image details are clear and sharp.

[0153] The key optical characteristics of the high-pixel camera lens in this embodiment are shown in Table 3-3:

[0154] Table 3-3

[0155] Basic parameters numerical values Basic parameters numerical values Effective focal length f 4.07mm The center thickness of the first lens is ct1 1.00mm Maximum field of view (FOV) 104.82° The center thickness of the second lens is ct2 1.86mm Total optical length TTL 15.86mm The center thickness of the sixth lens is ct6 0.57mm Realistic high IH 5.57mm The center thickness of the seventh lens is ct7 0.62mm Back focal length BFL 2.85mm The radius of curvature of the image side of the first lens is R12. 3.99mm Chief ray incident angle CRA 23.38° The radius of curvature of the object side of the seventh lens is R71. 2.16mm entrance pupil diameter EPD 1.99mm The radius of curvature of the side surface of the seventh lens is R72. 2.34mm Aperture value Fno 2.05 The seventh lens has an image side diameter of sd7. 8.69mm The seventh lens has a refractive index of Nd7. 1.64 The object side sagitta of the seventh lens is sagf71 -1.28mm The Abbe number of the seventh lens is Vd7. 34.5 The lateral sag of the image from the seventh lens is 72. -1.35mm The focal length of the first lens is f1 -5.89mm The seventh lens has a focal length of f7. 18.52mm

[0156] The key parameter ratios of the high-pixel lens in this embodiment are shown in Table 3-4:

[0157] Table 3-4

[0158]

[0159]

[0160] Example 4

[0161] like Figure 13 As shown, the high-resolution camera lens of this embodiment includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G; wherein,

[0162] The first lens L1 has negative refractive power, the object side S1 (paraxial region) is concave and has an extreme point off-axis, the image side S2 (paraxial region) is concave, and it is made of plastic aspherical material.

[0163] The second lens L2 has positive refractive power, with the object-side surface S3 (paraxial region) being convex and the image-side surface S4 (paraxial region) being concave, and is made of aspherical plastic material.

[0164] The third lens L3 has positive refractive power, with the object-side surface S5 (paraxial region) being convex and the image-side surface S6 (paraxial region) being convex, and is made of aspherical plastic material;

[0165] The fourth lens L4 has negative refractive power, with the object-side surface S7 (paraxial region) being concave and the image-side surface S8 (paraxial region) being concave. It is made of aspherical plastic material.

[0166] The fifth lens L5 has positive refractive power, with the object side S9 (paraxial region) being concave and the image side S10 (paraxial region) being convex. It is made of molded glass aspherical material.

[0167] The sixth lens L6 has negative refractive power. The object-side surface S11 (paraxial region) is convex, and the image-side surface S12 (paraxial region) is concave. It is made of aspherical plastic material.

[0168] The seventh lens L7 has positive refractive power. The object side S13 (paraxial region) is convex and has an inflection point off-axis, while the image side S14 (paraxial region) is concave. It is made of aspherical plastic material.

[0169] The relevant parameters of each lens, aperture, and filter of the high-pixel camera lens in this embodiment are shown in Table 4-1:

[0170] Table 4-1 (Unit: mm, except for refractive index Nd and Abbe number Vd)

[0171]

[0172]

[0173] In this embodiment, the surface shape parameters of the aspherical surfaces of each lens of the high-pixel camera lens are shown in Table 4-2 (where K is the quadratic surface coefficient, and A4-A24 are the aspherical coefficients of the corresponding orders):

[0174] Table 4-2

[0175]

[0176]

[0177] See Figure 14-16 These are the field curvature curve, distortion curve, and MTF curve of the high-pixel camera lens in this embodiment, respectively.

[0178] Field curvature curve ( Figure 14The field curvature offset of the meridional image plane (Tan) is controlled between -0.01mm and 0.05mm, and the field curvature offset of the sagittal image plane (Sag) is controlled between 0mm and -0.05mm. This indicates that the lens has excellent field curvature correction effect, the image surface is flat, and the difference in sharpness between the edge and center of the image can be effectively avoided.

[0179] Distortion curve ( Figure 15 The distortion value is controlled within 0 to 6%, which meets the design goal of small distortion and can ensure that the shape of the imaged object is real without obvious stretching or compression deformation.

[0180] MTF curve ( Figure 16 At a spatial frequency of 110 lp / mm, the MTF value of each field of view is greater than 0.3, indicating that the lens has high-resolution imaging capability, can meet the high pixel requirements, and the image details are clear and sharp.

[0181] The key optical characteristics of the high-resolution camera lens in this embodiment are shown in Table 4-3:

[0182] Table 4-3

[0183] Basic parameters numerical values Basic parameters numerical values Effective focal length f 3.99mm The center thickness of the first lens is ct1 1.00mm Maximum field of view (FOV) 110.77° The center thickness of the second lens is ct2 1.26mm Total optical length TTL 15.65mm The center thickness of the sixth lens is ct6 0.55mm Realistic high IH 5.87mm The center thickness of the seventh lens is ct7 1.14mm Back focal length BFL 3.37mm The radius of curvature of the image side surface of the first lens is R12. 5.10mm Chief ray incident angle CRA 24.54° The radius of curvature of the object side of the seventh lens is R71. 1.28mm Entrance pupil diameter EPD 1.99mm The radius of curvature of the side surface of the seventh lens is R72. 3.15mm Aperture value Fno 2.01 The seventh lens has an image side diameter of sd7. 8.70mm The seventh lens has a refractive index of Nd7. 1.53 The object side sagitta of the seventh lens is sagf71 -0.42mm The Abbe number of the seventh lens is Vd7. 55.70 The lateral sag of the image from the seventh lens is 72. -1.02mm The focal length of the first lens is f1 -7.27mm The seventh lens has a focal length of f7. 3.298mm

[0184] The key parameter ratios of the high-pixel camera lens in this embodiment are shown in Table 4-4:

[0185] Table 4-4

[0186]

[0187]

[0188] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-pixel camera lens, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: The first lens, the first lens has a negative refractive power, its object side surface is concave in the region near the optical axis and has an extreme point outside the optical axis, and its image side surface is concave in the region near the optical axis; The second lens, the second lens has a positive refractive power, its object side surface is convex in the region near the optical axis, and its image side surface is concave in the region near the optical axis; The third lens, the third lens has a positive refractive power, its object side surface is convex in the region near the optical axis, and its image side surface is convex in the region near the optical axis; The fourth lens, the fourth lens has a negative refractive power, and at least one of its surfaces is concave in the region near the optical axis; The fifth lens, the fifth lens has a positive refractive power, and at least one of its surfaces is convex in the region near the optical axis; The sixth lens, the sixth lens has a negative refractive power, its object side surface is convex in the region near the optical axis, and its image side surface is concave in the region near the optical axis; The seventh lens, the seventh lens has a positive refractive power, its object side surface is convex in the region near the optical axis and has an anastigmatic point outside the optical axis, and its image side surface is concave in the region near the optical axis; Wherein, the focal length f1 of the first lens and the effective focal length f of the high-pixel camera lens satisfy: -0.8 < f / f1 < -0.5; the focal length f7 of the seventh lens and the effective focal length f of the high-pixel camera lens satisfy: 0.2 < f / f7 < 1.

25.

2. The high-pixel camera lens according to claim 1, characterized in that, The optical total length TTL of the high-pixel camera lens, the maximum field angle FOV of the high-pixel camera lens, and the true image height IH corresponding to the maximum field angle FOV satisfy: -0.2 < (IH * cos FOV) / TTL < -0.

01.

3. The high-pixel camera lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the high-pixel camera lens and the effective focal length f of the high-pixel camera lens satisfy: 1.3 < IH / f < 1.5; the optical total length TTL, the maximum field angle FOV, and the true image height IH corresponding to the maximum field angle of the high-pixel camera lens satisfy: 4.3 < 180° * TTL / (IH * FOV) < 4.9; the effective focal length f, the maximum field angle FOV, and the true image height IH corresponding to the maximum field angle FOV of the high-pixel camera lens satisfy: 74° < f * FOV / IH < 77°.

4. The high-pixel camera lens according to claim 1, characterized in that, The optical total length TTL of the high-pixel camera lens and the back focal length BFL satisfy: 4.5 < TTL / BFL < 6.0; the maximum field angle FOV of the high-pixel camera lens and the chief ray angle of incidence CRA at the maximum image height of the high-pixel camera lens satisfy: 8.60 < FOV / (CRA / 2) < 9.

05.

5. The high-pixel camera lens according to claim 1, characterized in that, The central thickness ct1 of the first lens, the central thickness ct2 of the second lens, the central thickness ct6 of the sixth lens, and the central thickness ct7 of the seventh lens satisfy: 0.4 < (ct6 + ct7) / (ct1 + ct2) < 0.

8.

6. The high-pixel camera lens according to claim 1, characterized in that, The sagittal height sagf71 of the object side of the seventh lens and the sagittal height sagf72 of the image side satisfy: 0.35 < sagf71 / sagf72 < 1; the radius of curvature R12 of the image side of the first lens, the radius of curvature R71 of the object side of the seventh lens, and the radius of curvature R72 of the image side of the seventh lens satisfy: 0.2 < R12 / (R71*R72) < 1.

3.

7. The high-pixel camera lens according to claim 1, characterized in that, The refractive index Nd7 of the material of the seventh lens satisfies: 1.50 < Nd7 < 1.65; the Abbe number Vd7 of the material of the seventh lens satisfies: 30 < Vd7 < 60.

8. The high-pixel camera lens according to claim 1, characterized in that, The aperture value Fno of the high-pixel camera lens, the back focal length BFL of the high-pixel camera lens, and the image-side diameter sd7 of the seventh lens satisfy: 0.6 < Fno*BFL / sd7 < 0.9; the aperture value Fno of the high-pixel camera lens and the entrance pupil diameter EPD satisfy: 0.8 < EPD / Fno < 1.

0.

9. The high-pixel camera lens according to claim 1, characterized in that, Among the first lens to the seventh lens, at least five lenses are plastic aspherical lenses.

10. The high-pixel camera lens according to claim 1, characterized in that, The high-pixel camera lens further includes an aperture and a filter. The aperture is disposed between the second lens and the third lens, and the filter is disposed between the seventh lens and the imaging surface.

Images