Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, in sequence: a diaphragm; a first lens with positive focal power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative focal power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive focal power, the object side of which is a convex surface; a fourth lens with positive focal power, the object side of which is a convex surface near the optical axis; a fifth lens with positive focal power; a sixth lens with positive focal power; and a seventh lens with negative focal power, the object side and the image side of which are both concave surfaces near the optical axis; wherein the optical lens comprises at least one plastic lens and one glass lens. The optical lens adopts a glass-plastic hybrid lens arrangement, and through specific surface shape arrangement and focal power combination, the lens has the advantages of long focal length, large aperture, large target surface imaging and high pixel.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and in particular to an optical lens. Background Technology

[0002] With the continuous upgrading of smartphones, consumers have increasingly higher demands for mobile phone photography functions. Ultra-high pixels, large apertures, and telephoto shooting have become the main development trends of mobile phone lenses. In pursuit of high-quality imaging, most mainstream mobile phone lenses currently use all-plastic lenses, and the number of lenses has increased from 5-6 to 7-8 to correct the optical path. However, due to the constraints of mobile phone thinning and light reduction, as well as the light transmittance and assembly precision of plastic lenses, the number of plastic lenses is difficult to increase further, and all-plastic lenses have encountered a bottleneck. Since glass lenses have better light transmittance and less chromatic aberration, they can effectively correct chromatic aberration and shorten the overall system length. Therefore, hybrid glass-plastic lenses, which combine the advantages of glass and plastic lenses, can effectively reduce the overall lens length, correct system chromatic aberration, and improve the light intake and image clarity of the optical lens. They have been widely used in security monitoring, digital cameras, SLR cameras, and other devices, and are expected to be used in the main cameras of high-end flagship models.

[0003] Compared to all-plastic lenses, hybrid glass-plastic lenses offer higher light transmittance and more stable performance, improving image quality under varying light and dark conditions, and represent a future trend in mobile phone lens development. However, achieving optimal performance in terms of telephoto range, large aperture, high pixel count, and compact size remains a pressing issue. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of long focal length, large aperture, large target surface imaging, and high pixel count.

[0005] The embodiments of the present invention achieve the above-mentioned objectives through the following technical solutions.

[0006] This invention provides an optical lens comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: an aperture stop; a first lens with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave; a second lens with negative optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave; a third lens with positive optical power, wherein the object side of the third lens is convex; a fourth lens with positive optical power, wherein the object side of the fourth lens is convex near the optical axis; a fifth lens with positive optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power, wherein the object side of the seventh lens is concave near the optical axis and the image side of the seventh lens is concave near the optical axis; wherein the optical lens comprises at least one plastic lens and one glass lens.

[0007] Compared to existing technologies, the optical lens provided by this invention employs a glass-plastic hybrid lens combination. Through specific surface shape settings and a reasonable combination of two negative power lenses and five positive power lenses, the lens structure is more compact, possessing a longer focal length, a larger aperture, and higher image quality, enabling it to match large-area chips for high-definition imaging. Furthermore, by rationally selecting the glass material of the first lens and using aspherical surfaces, aberrations in the system can be effectively corrected, allowing the lens to achieve high pixel count while effectively shortening the overall system length, better meeting the miniaturization, high image quality, and telephoto shooting requirements of electronic devices. Attached Figure Description

[0008] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0009] Figure 1 This is a schematic diagram of the structure of the optical lens according to the first embodiment of the present invention;

[0010] Figure 2 This is an f-tanθ distortion curve of the optical lens according to the first embodiment of the present invention;

[0011] Figure 3 This is a paraxial field curve diagram of the optical lens according to the first embodiment of the present invention;

[0012] Figure 4 This is a chromatic aberration curve of the optical lens according to the first embodiment of the present invention;

[0013] Figure 5 This is a schematic diagram of the structure of the optical lens according to the second embodiment of the present invention;

[0014] Figure 6 This is an f-tanθ distortion curve of the optical lens according to the second embodiment of the present invention;

[0015] Figure 7 This is a paraxial field curve diagram of the optical lens according to the second embodiment of the present invention;

[0016] Figure 8 This is a chromatic aberration curve of the optical lens according to the second embodiment of the present invention;

[0017] Figure 9 This is a schematic diagram of the optical lens structure according to the third embodiment of the present invention;

[0018] Figure 10 This is an f-tanθ distortion curve of the optical lens according to the third embodiment of the present invention;

[0019] Figure 11 This is a paraxial field curve diagram of the optical lens according to the third embodiment of the present invention;

[0020] Figure 12 This is a chromatic aberration curve of the optical lens according to the third embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0023] This invention proposes an optical lens that, along the optical axis from the object side to the imaging plane, comprises, in sequence: an aperture stop, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a filter.

[0024] The first lens has positive optical power, its object side is convex, and its image side is concave.

[0025] The second lens has negative optical power, its object side is convex, and its image side is concave.

[0026] The third lens has positive optical power and its object side is convex.

[0027] The fourth lens has positive optical power, and its object-side surface is convex near the optical axis;

[0028] The fifth lens has positive optical power;

[0029] The sixth lens has positive optical power;

[0030] The seventh lens has negative optical power, and its object side is concave near the optical axis, as is its image side.

[0031] The optical lens comprises at least one plastic lens and one glass lens. Compared to plastic lenses, glass lenses have advantages such as a lower dispersion coefficient, better light transmission, and stronger stability, which can greatly reduce problems such as glare and ghosting. The glass-plastic lens combines the advantages of both glass and plastic lenses, reducing lens thickness and distortion, and improving image sharpness and aperture size.

[0032] This invention achieves a good balance between lens miniaturization and high pixel count by combining glass and plastic lenses and by reasonably constraining the surface shape and optical power of each lens. This not only makes the structure more compact, but also has high imaging quality and a large aperture.

[0033] In some embodiments, the optical lens satisfies the following condition:

[0034] -0.6 <f1 / f2<-0.1;

[0035] 27mm < (Vd1 / Vd2) × f < 32mm;

[0036] Where f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, Vd1 represents the Abbe number of the first lens, Vd2 represents the Abbe number of the second lens, and f represents the effective focal length of the optical lens. When the above conditions are met, the negative spherical aberration produced by the first lens (positive lens) can be balanced by the positive spherical aberration produced by the second lens (negative lens). Simultaneously, the positive lens has low dispersion, and the negative lens has high dispersion; the axial chromatic aberrations they produce can cancel each other out, ultimately achieving a better balance and improving the overall image quality.

[0037] In some embodiments, the optical lens satisfies the following condition:

[0038] 1 <f3 / f<10;

[0039] 2 <f4 / f<50;

[0040] Where f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, and f represents the effective focal length of the optical lens. By satisfying the above conditions and appropriately setting the focal length ratio of the third and fourth lenses, aberrations in the system can be better corrected, which is beneficial for achieving long focal length imaging and better realizing portrait shooting effects with a shallow depth of field.

[0041] In some embodiments, the optical lens satisfies the following condition:

[0042] 0.5 <f4 / f6<6;

[0043] 1 <f5 / f6<5;

[0044] Where f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, and f6 represents the focal length of the sixth lens. By satisfying the above conditions and reasonably setting the focal length relationship between the fourth, fifth, and sixth lenses, the aberrations of the system can be better balanced, the overall image quality of the lens can be improved, and better resolving power can be obtained.

[0045] In some embodiments, the optical lens satisfies the following condition:

[0046] 1 <f6 / f<10;

[0047] 0.3 <R61 / R62<3;

[0048] Wherein, f6 represents the focal length of the sixth lens, f represents the effective focal length of the optical lens, R61 represents the radius of curvature of the object-side surface of the sixth lens, and R62 represents the radius of curvature of the image-side surface of the sixth lens. By satisfying the above conditions and appropriately adjusting the focal length and surface shape of the sixth lens, the shape change of the sixth lens can be mitigated, stray light generation reduced, and overall image quality improved.

[0049] In some embodiments, the optical lens satisfies the following condition:

[0050] -1 <f7 / f<-0.3;

[0051] -0.8 <R71 / R72<0;

[0052] Wherein, f7 represents the focal length of the seventh lens, f represents the effective focal length of the optical lens, R71 represents the radius of curvature of the object-side surface of the seventh lens, and R72 represents the radius of curvature of the image-side surface of the seventh lens. By satisfying the above conditions and appropriately setting the focal length and surface shape of the seventh lens, the seventh negative lens can better converge light, achieving a large target-area imaging effect and high-quality imaging.

[0053] In some embodiments, the optical lens satisfies the following condition:

[0054] -0.3 <f7 / f6<-0.05;

[0055] Where f6 represents the focal length of the sixth lens and f7 represents the focal length of the seventh lens. Meeting the above conditions, by rationally allocating the focal length ratio of the sixth and seventh lenses, helps to balance the aberrations of the entire system, improve image quality, and at the same time, allows for reasonable control of light trajectory, avoiding the problem of excessive lens sensitivity caused by excessive light deflection.

[0056] In some embodiments, the optical lens satisfies the following condition:

[0057] 0.16 <CT1 / TTL<0.3;

[0058] 2 <CT1 / CT2<4;

[0059] Wherein, CT1 represents the center thickness of the first lens, CT2 represents the center thickness of the second lens, and TTL represents the total optical length of the optical lens. Meeting the above conditions ensures that the first lens has an appropriate thickness, preventing edge cracking caused by excessive thinness during lens molding and by the robotic arm during assembly. Simultaneously, by reasonably controlling the thickness difference between the first and second lenses, it avoids the second lens being too thin, which could lead to uneven filling of the plastic material during lens molding, affecting overall imaging quality and improving production yield.

[0060] In some embodiments, the optical lens satisfies the following condition:

[0061] 1.8 <TTL / IH<1.9;

[0062] 1.5 <f / IH<1.8;

[0063] Where TTL represents the total optical length of the optical lens, IH represents half the diagonal length of the effective pixel area on the imaging surface of the optical lens, and f represents the effective focal length of the optical lens. Meeting these conditions enables large-area imaging of the optical lens. Increasing pixel size with the same pixel count improves the chip's energy reception efficiency for the light gathered by the lens, thereby improving image quality. Simultaneously, it better realizes the lens's telephoto performance, achieving background blurring and subject highlighting effects.

[0064] In some embodiments, the optical lens satisfies the following condition:

[0065] 1.5 <f / EPD<1.8;

[0066] 8mm <f<9mm;

[0067] Where f represents the effective focal length of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. Meeting the above conditions indicates that the optical lens has a large aperture characteristic. While achieving a longer focal length, this also increases the amount of light entering the lens to a certain extent, reducing the impact of noise generated in insufficient light on the image. This allows the lens to still have excellent imaging performance in low-light environments, thus meeting the imaging needs of both bright and dark environments.

[0068] In some embodiments, the optical lens satisfies the following condition:

[0069] 0.09 <BFL / TTL<0.13;

[0070] Wherein, TTL represents the total optical length of the optical lens, and BFL represents the total optical length of the optical lens. Meeting the above conditions ensures the image quality of the optical lens, resulting in clearer images; simultaneously, it allows for reasonable control of the back focal length of the optical lens, ensuring lens miniaturization while maintaining sufficient back focal length space, reducing interference during lens-chip module assembly.

[0071] In some embodiments, the optical lens satisfies the following condition:

[0072] 0.2 <SAG11 / DM1<0.3;

[0073] 0.2 <CT1 / DM1<0.6;

[0074] Wherein, SAG11 represents the edge sagitta of the object-side surface of the first lens, DM1 represents the effective diameter of the first lens, and CT1 represents the center thickness of the first lens. Meeting these conditions allows for reasonable control of the surface shape of the first lens, reduces its processing difficulty, and improves production yield.

[0075] In some embodiments, the optical lens satisfies the following condition:

[0076] -7 <f2 / f<-1;

[0077] -1<(R21-R22) / (R21+R22)<-0.3;

[0078] Where f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R21 represents the radius of curvature of the object-side surface of the second lens, and R22 represents the radius of curvature of the image-side surface of the second lens. By satisfying the above conditions and appropriately setting the focal length ratio and surface shape of the second lens, the spherical aberration generated by the second lens can be effectively balanced, thereby improving the overall image quality.

[0079] In some embodiments, the optical lens satisfies the following condition:

[0080] -2.2 < (R41 - R42) / (R41 + R42) < 0;

[0081] Wherein, R41 represents the radius of curvature of the object-side surface of the fourth lens, and R42 represents the radius of curvature of the image-side surface of the fourth lens. By satisfying the above conditions and appropriately setting the surface shape of the fourth lens, it is possible to better correct aberrations in the system, which is beneficial for achieving a long focal length and improving image quality.

[0082] In some embodiments, the optical lens satisfies the following condition:

[0083] -2 < (SAG41 + SAG42) / ET4 < -0.3;

[0084] Wherein, SAG41 represents the edge sagitta of the object-side surface of the fourth lens, SAG42 represents the edge sagitta of the image-side surface of the fourth lens, and ET4 represents the edge thickness of the fourth lens. Meeting these conditions helps to better correct field curvature and spherical aberration, can mitigate shape changes in the fourth lens, reduce the manufacturing difficulty of the fourth lens, and improve overall image quality.

[0085] In some embodiments, the optical lens satisfies the following condition:

[0086] -2 <SAG61 / CT6<-0.1;

[0087] Wherein, SAG61 represents the edge sagitta of the object-side surface of the sixth lens, and CT6 represents the center thickness of the sixth lens. Meeting the above conditions effectively controls the ratio of the sagitta to the thickness of the sixth lens, which facilitates its fabrication, reduces manufacturing difficulty, and improves manufacturing yield.

[0088] In some embodiments, the optical lens satisfies the following condition:

[0089] 1.2 <f / ΣCT<1.5;

[0090] Where f represents the effective focal length of the optical lens, and ΣCT represents the total thickness of the first to seventh lenses along the optical axis. By satisfying the above conditions and rationally allocating the center thickness of the first to seventh lenses, the sensitivity of the center thickness of each lens in the optical lens can be reduced, the manufacturing yield can be improved, and the overall length of the optical system can be shortened, maintaining its miniaturization for application in portable electronic products.

[0091] In some embodiments, the optical lens satisfies the following condition:

[0092] 0.1 <CT56 / CT67<1;

[0093] 0.08 < (CT5 + CT6) / TTL < 0.2;

[0094] Wherein, CT56 represents the distance between the fifth and sixth lenses on the optical axis, CT67 represents the distance between the sixth and seventh lenses on the optical axis, CT5 represents the center thickness of the fifth lens, CT6 represents the center thickness of the sixth lens, and TTL represents the total optical length of the optical lens. Meeting the above conditions allows for the rational allocation of the center thicknesses of the fifth, sixth, and seventh lenses and the distance between them, adjusting the light distribution and facilitating the compactness and miniaturization of the optical lens structure.

[0095] As one implementation method, a hybrid glass-plastic structure combining one glass lens and six plastic lenses allows the lens to better match the large-area chip for high-definition imaging, while also achieving a reasonable balance between a large aperture, miniaturization, and long focal length. Since the first lens is made of aspherical glass, the low dispersion of glass effectively corrects the geometric chromatic aberration of the optical lens. Specifically, the first lens is a glass aspherical lens, while the second, third, fourth, fifth, sixth, and seventh lenses are plastic aspherical lenses. Using aspherical lenses effectively reduces costs, corrects aberrations, and provides a more cost-effective optical performance product. It should be noted that other combinations of glass-plastic hybrid lenses can also meet the requirements; the specific choice can be made according to the specific needs.

[0096] The present invention will be further described below with reference to several 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 changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention.

[0097] In various embodiments of the present invention, when an aspherical lens is used, the surface shape of the aspherical lens satisfies the following equation:

[0098]

[0099] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the quadratic surface coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0100] First Embodiment

[0101] Please see Figure 1 The diagram shown is a schematic diagram of the structure of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.

[0102] The first lens L1 has positive optical power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave.

[0103] The second lens L2 has negative optical power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave.

[0104] The third lens L3 has positive optical power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave.

[0105] The fourth lens L4 has positive optical power. The object side S7 of the fourth lens is convex near the optical axis, and the image side S8 of the fourth lens is convex near the optical axis.

[0106] The fifth lens L5 has positive optical power. The object side S9 of the fifth lens is convex near the optical axis, and the image side S10 of the fifth lens is convex.

[0107] The sixth lens L6 has positive optical power. The object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is convex.

[0108] The seventh lens L7 has negative optical power. The object side S13 of the seventh lens is concave, and the image side S14 of the seventh lens is concave near the optical axis.

[0109] The object side of filter G1 is S15, and the image side is S16.

[0110] The first lens L1 is a glass aspherical lens, while 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.

[0111] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0112] Table 1

[0113]

[0114]

[0115] The surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment are shown in Table 2.

[0116] Table 2

[0117]

[0118]

[0119] Please refer to Figure 2 , Figure 3 as well as Figure 4 The figures shown are the f-tanθ distortion curve, paraxial field curve, and transverse chromatic aberration curve of the optical lens 100, respectively. Figure 2It can be seen that the optical distortion is controlled within 1.5%, indicating that the distortion of the optical lens 100 has been well corrected; from Figure 3 As can be seen, the field curvature is controlled within ±0.1mm, indicating that the field curvature correction of the optical lens 100 is good; from Figure 4 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±1 micrometer, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected; from Figure 2 , Figure 3 , Figure 4 It can be seen that the aberrations of the optical lens 100 are well balanced, resulting in good optical imaging quality.

[0120] Second Embodiment

[0121] like Figure 5 The diagram shown is a structural schematic of the optical lens 200 provided in this embodiment. The optical lens 200 in this embodiment is generally the same as that in the first embodiment described above. The main differences are: the image-side surface S6 of the third lens is convex near the optical axis, the image-side surface S8 of the fourth lens is concave near the optical axis, the object-side surface S11 of the sixth lens is convex near the optical axis, the image-side surface S12 of the sixth lens is concave near the optical axis, and the curvature radius, aspherical coefficient, and thickness of each lens surface are different.

[0122] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0123] Table 3

[0124]

[0125]

[0126] The surface coefficients of each aspherical surface of the optical lens 200 in this embodiment are shown in Table 4.

[0127] Table 4

[0128]

[0129]

[0130] Please refer to Figure 6 , Figure 7 and Figure 8 The figures shown are the f-tanθ distortion curve, paraxial field curve, and transverse chromatic aberration curve of the optical lens 200, respectively. Figure 6 It can be seen that the optical distortion is controlled within 2.5%, indicating that the distortion of the 200mm optical lens has been well corrected; from Figure 7 As can be seen, the field curvature is controlled within ±0.15mm, indicating that the field curvature correction of the 200mm optical lens is relatively good; from Figure 8 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±1.2 micrometers, indicating that the transverse chromatic aberration of the optical lens 200 is well corrected; from Figure 6 , Figure 7 , Figure 8 It can be seen that the aberrations of the optical lens 200 are well balanced, resulting in good optical imaging quality.

[0131] Third Embodiment

[0132] like Figure 9 The diagram shown is a structural schematic of the optical lens 300 provided in this embodiment. The optical lens 300 in this embodiment is generally the same as that in the first embodiment described above. The main differences are that the image-side surface S8 of the fourth lens is concave near the optical axis, the image-side surface S10 of the fifth lens is concave near the optical axis, the object-side surface S11 of the sixth lens is convex near the optical axis, the image-side surface S12 of the sixth lens is concave near the optical axis, and the curvature radius, aspherical coefficient, and thickness of each lens surface are different.

[0133] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0134] Table 5

[0135]

[0136]

[0137] The surface shape coefficients of each aspherical surface of the optical lens 300 in this embodiment are shown in Table 6.

[0138] Table 6

[0139]

[0140]

[0141] Please refer to Figure 10 , Figure 11 and Figure 12 The figures shown are the f-tanθ distortion curve, paraxial field curve, and transverse chromatic aberration curve of the optical lens 300, respectively. Figure 10 It can be seen that the optical distortion is controlled within 2%, indicating that the distortion of the 300mm optical lens has been well corrected; from Figure 11 It can be seen that the paraxial field curvature is controlled within ±0.06mm, indicating that the field curvature correction of the 300mm optical lens is good; from Figure 12 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within ±1 micrometer, indicating that the transverse chromatic aberration of the optical lens 300 is well corrected; from Figure 10 , Figure 11 , Figure 12 It can be seen that the aberrations of the 300mm optical lens are well balanced, resulting in good optical imaging quality.

[0142] Please refer to Table 7, which shows the optical characteristics of the optical lenses provided in the three embodiments above, including the maximum field of view (FOV), total optical length (TTL), actual half-image height (IH), effective focal length (f), and the relevant values ​​corresponding to each of the aforementioned conditional expressions.

[0143] Table 7

[0144]

[0145]

[0146] Compared with the prior art, the glass-plastic hybrid optical lens provided by the present invention has at least the following advantages:

[0147] (1) A balance between high pixel count and miniaturization can be achieved. Since glass has better light transmittance and lower dispersion coefficient, the optical lens provided by this invention uses one glass lens and six plastic lenses, which can be basically consistent with the optical quality of the current mainstream 8-piece plastic lens, and has better light transmittance and optical performance, thus achieving a balance between high pixel count and miniaturization of the lens.

[0148] (2) More layers of coating optimization can be achieved. At present, most plastic lens coatings are made using high-temperature processes. Under such processes, plastic lenses are more likely to deform, resulting in a lower yield. Usually, no more than 5 layers of coating are used. In contrast, glass lenses have strong high-temperature resistance and can achieve more layers of coating to control reflection and glare, further improving the optical imaging quality.

[0149] (3) It can achieve large aperture performance. Due to the reasonable setting of the lens surface shape and optical power, and the aperture stop is set in front of the first lens, the lens can have the characteristics of a super large aperture, which increases the light throughput entering the lens to a certain extent, reduces the impact of noise generated when the light is insufficient on the image, and enables the lens to still have excellent imaging effect in dark environments at night, thus meeting the imaging needs of bright and dark environments.

[0150] In summary, the optical lens provided by this invention employs seven glass-plastic hybrid lenses. Through specific surface shape settings and reasonable power distribution, the optical lens has a relatively compact structure, a long focal length, a large aperture, and high image quality, enabling it to match a 50M high-pixel chip for high-definition imaging. Furthermore, by rationally selecting the glass material of the first lens and using aspherical surfaces, the aberrations of the system can be reasonably corrected. This allows the lens to achieve high pixel count while effectively shortening the overall length of the system, better meeting the miniaturization and high-image-quality requirements of electronic devices.

[0151] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0152] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An optical lens characterized in that, In order from the object side to the imaging plane along the optical axis, comprises successively: a diaphragm; a first lens with positive refractive power, the object side surface of the first lens is convex, the image side surface of the first lens is concave; a second lens with negative refractive power, the object side surface of the second lens is convex, the image side surface of the second lens is concave; a third lens with positive refractive power, the object side surface of the third lens is convex; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex at the near optical axis; a fifth lens with positive refractive power; a sixth lens with positive refractive power; a seventh lens with negative refractive power, the object side surface of the seventh lens is concave at the near optical axis, the image side surface of the seventh lens is concave at the near optical axis; wherein the optical lens comprises at least one plastic lens and one glass lens; the optical lens satisfies the following conditional expressions: -0.6 < f1 / f2 < -0.1; 27 mm < (Vd1 / Vd2) x f < 32 mm; wherein f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, Vd1 represents the Abbe number of the first lens, Vd2 represents the Abbe number of the second lens, and f represents the effective focal length of the optical lens.

2. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: 1 < f3 / f < 10; 2 < f4 / f < 50; wherein f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, and f represents the effective focal length of the optical lens.

3. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: 1 < f5 / f6 < 5; 0.5 < f4 / f6 < 6; wherein f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, and f6 represents the focal length of the sixth lens.

4. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: 1 < f6 / f < 10; 0.3 < R61 / R62 < 3; wherein f6 represents the focal length of the sixth lens, f represents the effective focal length of the optical lens, R61 represents the radius of curvature of the object side surface of the sixth lens, and R62 represents the radius of curvature of the image side surface of the sixth lens.

5. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: -1 < f7 / f < -0.3; -0.8 < R71 / R72 < 0; wherein f7 represents the focal length of the seventh lens, f represents the effective focal length of the optical lens, R71 represents the radius of curvature of the object side surface of the seventh lens, and R72 represents the radius of curvature of the image side surface of the seventh lens.

6. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: -0.3 < f7 / f6 < -0.05; wherein f6 represents the focal length of the sixth lens, and f7 represents the focal length of the seventh lens.

7. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: 0.16 < CT1 / TTL < 0.3; 2 < CT1 / CT2 < 4; wherein CT1 represents the center thickness of the first lens, CT2 represents the center thickness of the second lens, and TTL represents the total optical length of the optical lens.

8. The optical lens of claim 1, wherein, the optical lens satisfies the following conditional expressions: 1.8 < TTL / IH < 1.9; 1.5 < f / IH < 1.8; Wherein, TTL represents total track length of the optical lens, IH represents half of diagonal line length of effective pixel area on imaging surface of the optical lens, and f represents effective focal length of the optical lens.

9. The optical lens of claim 1, wherein, The optical lens satisfies following conditional expression: 1.5 < f / EPD < 1.8; 8mm < f < 9mm; Wherein, f represents effective focal length of the optical lens, and EPD represents entrance pupil diameter of the optical lens.

10. The optical lens of claim 1, wherein, The first lens is a glass aspherical lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspherical lenses.

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