Optical lens

Abstract

The present invention discloses an optical lens, which comprises, along the optical axis from the object side to the imaging surface, the following sequence: an aperture; a first lens with positive focal power, whose object side surface is convex and whose image side surface is concave; a second lens with negative focal power, whose object side surface is convex and whose image side surface is concave; a third lens with positive focal power; a fourth lens with positive focal power, whose object side surface is convex and whose image side surface is concave; a fifth lens with positive focal power, whose object side surface is concave and whose image side surface is convex; a sixth lens with negative focal power, whose object side surface is concave; a seventh lens with negative focal power, whose object side surface is concave 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 combination, and through a specific surface shape combination and optical power combination, the lens has the advantages of long focal length, large aperture, large target imaging 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 upgrade of smartphones, consumers are demanding increasingly advanced camera features. Ultra-high pixel count, large aperture, and telephoto shooting have become the main trends in mobile phone lenses. To achieve high-quality imaging, mainstream mobile phone lenses currently use all-plastic lenses, with the number of lenses increasing from 5-6 to 7-8 to correct the optical path. However, due to the increasing thinness of mobile phones, as well as the light transmittance and assembly precision of plastic lenses, further increases in the number of plastic lenses are difficult, and all-plastic lenses have reached a bottleneck. Because glass lenses offer greater light transmittance and reduced dispersion, they can effectively correct chromatic aberration and shorten the overall system length. Therefore, glass-plastic hybrid lenses, combining the advantages of both glass and plastic lenses, can effectively reduce overall lens length, correct for system chromatic aberration, and improve optical light intake and image clarity. They have been widely used in security surveillance, digital cameras, SLR cameras, and other equipment, and are expected to be used in the main cameras of high-end flagship models.

[0003] Compared to all-plastic lenses, glass-plastic hybrid lenses offer higher light transmittance and more stable performance, improving imaging in varying light and dark conditions. They are a future trend in mobile phone lenses. However, achieving the long focal length, large aperture, high pixel count, and compact size of glass-plastic hybrid lenses remains a pressing challenge. Summary of the Invention

[0004] To this end, the object of the present invention is to provide an optical lens having the advantages of long focal length, large aperture, large target surface imaging, and high pixel count.

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

[0006] The present invention provides an optical lens, which comprises, in order from the object side to the imaging surface along the optical axis: an aperture; a first lens with positive focal power, wherein the object side surface of the first lens is convex and the image side surface of the first lens is concave; a second lens with negative focal power, wherein the object side surface of the second lens is convex and the image side surface of the second lens is concave; a third lens with positive focal power; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is convex and the image side surface of the fourth lens is concave; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is concave and the image side surface of the fifth lens is convex; a sixth lens with negative focal power, wherein the object side surface of the sixth lens is concave; and a seventh lens with negative focal power, wherein the object side surface 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 with the existing technology, the optical lens provided by the present invention adopts a glass-plastic hybrid lens combination. Through a specific surface shape setting and a reasonable optical focal length distribution, especially the second lens and the sixth lens are both negative optical focal lengths, the structure of the optical lens is relatively compact, and at the same time it has a larger aperture and higher imaging quality, which can match a large target chip to achieve high-definition imaging; by reasonably selecting the glass material of the first lens and using an aspheric surface, the system's aberration can be reasonably corrected, so that the lens has high pixels while effectively shortening the overall length of the system, better meeting the use requirements of miniaturization, high image quality, and telephoto shooting of electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0009] Figure 1 Schematic diagram of the structure of the optical lens according to the first embodiment of the present invention;

[0010] Figure 2 is a field curvature curve diagram of the optical lens according to the first embodiment of the present invention;

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

[0012] Figure 4 is an axial chromatic aberration curve of the optical lens in the first embodiment of the present invention;

[0013] Figure 5 is a vertical axis chromatic aberration curve of the optical lens in the first embodiment of the present invention;

[0014] Figure 6 Schematic diagram of the structure of an optical lens according to a second embodiment of the present invention;

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

[0016] Figure 8 is a distortion curve diagram of the optical lens according to the second embodiment of the present invention;

[0017] Figure 9 is a graph showing an axial chromatic aberration curve of the optical lens in the second embodiment of the present invention;

[0018] Figure 10 is a vertical axis chromatic aberration curve of the optical lens in the second embodiment of the present invention;

[0019] Figure 11 Schematic diagram of the structure of an optical lens according to a third embodiment of the present invention;

[0020] Figure 12 is a field curvature curve diagram of the optical lens according to the third embodiment of the present invention;

[0021] Figure 13 is a distortion curve diagram of the optical lens according to the third embodiment of the present invention;

[0022] Figure 14 is a graph showing an axial chromatic aberration curve of the optical lens in the third embodiment of the present invention;

[0023] Figure 15 FIG. 4 is a vertical chromatic aberration curve of the optical lens in the third embodiment of the present invention. DETAILED DESCRIPTION

[0024] To make the objects, features, and advantages of the present invention more readily apparent, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The accompanying drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. Throughout the specification, the same reference numerals refer to the same elements.

[0026] The present invention provides an optical lens, which includes, along the optical axis from the object side to the imaging surface, an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a filter.

[0027] The first lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave;

[0028] The second lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0029] The third lens has positive optical power;

[0030] The fourth lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave;

[0031] The fifth lens has positive refractive power, its object-side surface is concave, and its image-side surface is convex;

[0032] The sixth lens has negative optical power and its object-side surface is concave;

[0033] The seventh lens element has negative optical power, and its object side surface is concave near the optical axis;

[0034] The optical lens comprises at least one plastic lens and one glass lens. Compared to plastic lenses, glass lenses offer advantages such as lower aberration coefficient, better light transmittance, and greater stability, significantly reducing issues such as glare and ghosting. Glass-plastic lenses combine the advantages of both glass and plastic lenses, reducing lens thickness and distortion while improving image clarity and aperture size.

[0035] The present invention combines glass and plastic lenses and reasonably constrains the surface shape and optical power of each lens, thereby not only making the structure more compact but also achieving higher imaging quality and a larger aperture, thereby better achieving a reasonable balance between lens miniaturization and high pixel count.

[0036] In some embodiments, the optical lens satisfies the following conditional formula:

[0037] 0.6 <f1 / f<1.05;

[0038] 27mm<(Vd1 / Vd2)×f<32mm;

[0039] Where f1 represents the focal length of the first 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. By satisfying the above conditions and properly setting the focal length ratio of the first lens, the negative spherical aberration generated by the first lens (positive lens) can be balanced by the positive spherical aberration generated by the second lens (negative lens). At the same time, by properly setting the material relationship between the first and second lenses, the positive lens has low dispersion and the negative lens has high dispersion, and the axial chromatic aberrations generated by them can be offset, ultimately achieving a better balance and improving overall imaging quality.

[0040] In some embodiments, the optical lens satisfies the following conditional formula:

[0041] 5 <f4 / f<30;

[0042] 0.2 <R41 / R42<1;

[0043] Where f4 represents the focal length of the fourth lens element, f represents the effective focal length of the optical lens, R41 represents the radius of curvature of the object-side surface of the fourth lens element, and R42 represents the radius of curvature of the image-side surface of the fourth lens element. Meeting these conditions and properly setting the focal length and surface shape of the fourth lens element can better correct system aberrations, facilitate long-focal-length imaging, and enhance portraiture effects with a narrow depth of field.

[0044] In some embodiments, the optical lens satisfies the following conditional formula:

[0045] -2 <f6 / f<-0.5;

[0046] Where f6 represents the focal length of the sixth lens element, and f represents the effective focal length of the optical lens. By properly adjusting the focal length and surface shape of the sixth lens element, these conditions can be met to mitigate shape changes, reduce stray light, and effectively improve aberrations in the peripheral field of view, thereby enhancing overall imaging quality.

[0047] In some embodiments, the optical lens satisfies the following conditional formula:

[0048] -20 <f4 / f6<-5;

[0049] Where f4 represents the focal length of the fourth lens element, and f6 represents the focal length of the sixth lens element. By satisfying these conditions and properly setting the focal length relationship between the fourth and sixth lenses, the system's aberrations can be better balanced, improving the overall lens image quality and achieving superior resolution.

[0050] In some embodiments, the optical lens satisfies the following conditional formula:

[0051] 0.3 <f7 / f6<1;

[0052] Where f6 represents the focal length of the sixth lens element, and f7 represents the focal length of the seventh lens element. Meeting these conditions and properly allocating the focal length ratio between the sixth and seventh lenses helps balance aberrations across the entire system, improving image quality. It also effectively controls light distribution, avoiding issues like excessive light deflection and resulting in increased lens sensitivity.

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

[0054] 0.2 <CT1 / TTL<0.3;

[0055] CT1 / CT2>3.5;

[0056] Where 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 these conditions ensures the first lens has an appropriate thickness, preventing issues such as lens edge cracking caused by excessive thickness during the molding process and by the robotic gripper during assembly. Furthermore, by properly controlling the thickness difference between the first and second lenses, the second lens is prevented from being too thin, which could lead to uneven filling of the plastic material during lens molding and affect overall imaging quality, thereby improving production yield.

[0057] In some embodiments, the optical lens satisfies the following conditional formula:

[0058] 1.5 <TTL / IH<1.8;

[0059] 1 <TTL / f<1.2;

[0060] 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 plane of the optical lens, and f represents the effective focal length of the optical lens. Meeting these conditions enables large-area imaging with the optical lens. Increasing the pixel size while maintaining the same pixel density can improve the chip's energy efficiency in receiving the light focused by the lens, thereby enhancing imaging quality. This also allows for a better balance between lens miniaturization and long focal length.

[0061] In some embodiments, the optical lens satisfies the following conditional formula:

[0062] 1.5 <f / IH<1.6;

[0063] Where 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 can better achieve a balance between the lens's long focal length and large imaging area, facilitating high-definition photography with blurred backgrounds and a prominent subject.

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

[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 these conditions indicates that the optical lens has a large aperture. While achieving a longer focal length, it also increases the amount of light entering the lens to a certain extent, reducing the impact of noise generated in low light on the image. This allows the lens to produce excellent imaging results even in dim nighttime environments, thus meeting imaging requirements in both bright and dark environments.

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

[0069] 5mm <f×tanθ<6mm;

[0070] Wherein, f represents the effective focal length of the optical lens, and θ represents the maximum half-field angle of the optical lens. Meeting the above conditions enables the lens to be well matched with a large-surface chip to achieve high-definition imaging.

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

[0072] -12 <f2 / f<-1;

[0073] 2<(R21+R22) / (R21-R22)<20;

[0074] Where f2 represents the focal length of the second lens element, 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 element, and R22 represents the radius of curvature of the image-side surface of the second lens element. Meeting these conditions and appropriately setting the focal length and surface shape of the second negative lens element can help reduce the overall optical length, better correct system aberrations, and improve imaging quality.

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

[0076] 0.5 <ET6 / CT6<3;

[0077] 0 <CT6 / TTL<0.08;

[0078] Where ET6 represents the edge thickness of the sixth lens element, CT6 represents the center thickness of the sixth lens element, and TTL represents the total optical length of the optical lens. Meeting these conditions and properly controlling the thickness ratio of the sixth lens element not only facilitates lens molding and improves production yield, but also helps shorten the total optical length of the system, achieving lens miniaturization.

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

[0080] -2<(R61+R62) / (R61-R62)<-0.6;

[0081] -3<(f6+f7) / f<-1;

[0082] Among them, R61 represents the curvature radius of the object-side surface of the sixth lens, R62 represents the curvature radius of the image-side surface of the sixth lens, f6 represents the focal length of the sixth lens, f7 represents the focal length of the seventh lens, and f represents the effective focal length of the optical lens. Meeting the above conditions can effectively control the surface shape of the sixth lens, effectively improve the aberration of the marginal field of view, and enhance the imaging quality.

[0083] In some embodiments, the optical lens satisfies the following conditional formula:

[0084] 0.06<(CT5+CT56) / TTL<0.25;

[0085] 0.2<(R51-R52) / (R51+R52)<0.7;

[0086] Where CT5 represents the center thickness of the fifth lens element, R51 represents the radius of curvature of the object-side surface of the fifth lens element, R52 represents the radius of curvature of the image-side surface of the fifth lens element, CT56 represents the air gap between the fifth and sixth lenses on the optical axis, and TTL represents the total optical length of the optical lens element. Meeting these conditions effectively controls the center thickness and surface shape of the fifth lens element, thereby effectively correcting the system's spherical aberration and improving image quality.

[0087] In some embodiments, the optical lens satisfies the following conditional formula:

[0088] 10<(f3+f4) / f<30;

[0089] 0.1<(CT3+CT4+CT34) / TTL<0.16;

[0090] Where f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, f represents the effective focal length of the optical lens, CT3 represents the center thickness of the third lens, CT4 represents the center thickness of the fourth lens, CT34 represents the air gap between the third and fourth lenses on the optical axis, and TTL represents the total optical length of the optical lens. Meeting the above conditions not only makes the lens structure more compact, but also, by properly setting the focal lengths of the third and fourth lenses, allows the emitted light to be more smoothly transmitted to the subsequent optical system, further improving aberrations and enhancing image quality.

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

[0092] -8<(R41+R42) / (R41-R42)<-1;

[0093] Wherein, R41 represents the curvature radius of the object side surface of the fourth lens, and R42 represents the curvature radius of the image side surface of the fourth lens. When the above conditions are met, chromatic aberration can be effectively corrected and imaging quality can be improved.

[0094] In some embodiments, the optical lens satisfies the following conditional formula:

[0095] -1.5 <f5 / f6<-0.1;

[0096] 1.5<(R51+R52) / (R51-R52)<3;

[0097] Where f5 represents the effective focal length of the fifth lens element, f6 represents the effective focal length of the sixth lens element, R51 represents the radius of curvature of the object-side surface of the fifth lens element, and R52 represents the radius of curvature of the image-side surface of the fifth lens element. Meeting these conditions allows the decentration of the fifth lens element to be distributed to the sixth lens element, increasing the overall optimization space for the lens element, thereby further improving optical performance and achieving high-definition imaging.

[0098] As an implementation method, a glass-plastic hybrid structure consisting of one glass lens and six plastic lenses is used, which can enable the lens to better match the large target chip to achieve high-definition imaging, while also achieving a reasonable balance of large aperture, miniaturization and long focal length of the lens. Since the first lens is made of glass aspherical material, the geometric chromatic aberration of the optical lens is effectively corrected through the low dispersion characteristics of the glass itself. Among them, the first lens is a glass aspherical lens, and the second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens are plastic aspherical lenses. The use of aspherical lenses can effectively reduce costs, correct aberrations, and provide more cost-effective optical performance products. It should be pointed out that other combinations of glass-plastic hybrid lenses can also meet the needs, and specific choices can be made according to needs.

[0099] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0100] In various embodiments of the present invention, when the lens is an aspheric lens, the surface shape of the aspheric lens satisfies the following equation:

[0101]

[0102] Among them, z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is 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 is the 2i-th order aspheric surface coefficient.

[0103] First embodiment

[0104] See also Figure 1, shown is a schematic structural diagram 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, 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.

[0105] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;

[0106] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave;

[0107] The third lens L3 has positive refractive power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave near the optical axis;

[0108] The fourth lens L4 has positive refractive power, the object-side surface S7 of the fourth lens is convex at the near optical axis, and the image-side surface S8 of the fourth lens is concave at the near optical axis;

[0109] The fifth lens L5 has positive refractive power, the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex;

[0110] The sixth lens L6 has negative optical power, the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is concave near the optical axis;

[0111] The seventh lens L7 has negative optical power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is convex;

[0112] The object-side surface of the filter G1 is S15, and the image-side surface is S16.

[0113] The first lens L1 is a glass aspherical lens, and 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.

[0114] Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in Table 1.

[0115] Table 1

[0116]

[0117]

[0118] The surface coefficients of the aspheric surfaces of the optical lens 100 in this embodiment are shown in Table 2.

[0119] Table 2

[0120]

[0121]

[0122] Please refer to Figure 2 、 Figure 3 、 Figure 4 as well as Figure 5 , which are respectively the field curvature curve, distortion curve, axial chromatic aberration curve and vertical chromatic aberration curve of the optical lens 100. Figure 2 It can be seen that the field curvature is controlled within 0.03mm, indicating that the field curvature of the optical lens 100 is well corrected; Figure 3 It can be seen from FIG that the distortion is controlled within ±2%, indicating that the optical lens 100 has good distortion correction. Figure 4 It can be seen from the figure that the offset of the axial chromatic aberration is within ±0.035mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected. Figure 5 It can be seen from the figure that the vertical axial chromatic aberration between the shortest wave and the longest wave is controlled within ±1.5 μm, indicating that the vertical axial chromatic aberration of the optical lens 100 is well corrected. Figure 2 、 Figure 3 、 Figure 4 as well as Figure 5 It can be seen that the aberration of the optical lens 100 is well balanced, and has good optical imaging quality.

[0123] Second embodiment

[0124] like Figure 6 , which is a schematic diagram of the structure of the optical lens 200 provided in this embodiment. The optical lens 200 in this embodiment is substantially the same as the first embodiment described above, with the main differences being that the object side surface of the third lens is concave, the image side surface of the third lens is convex, the image side surface of the seventh lens is concave, and the curvature radius and aspheric coefficient of each lens surface, and the surface profiles of the fifth and sixth lenses are different.

[0125] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0126] Table 3

[0127]

[0128]

[0129] The surface coefficients of the aspheric surfaces of the optical lens 200 in this embodiment are shown in Table 4.

[0130] Table 4

[0131]

[0132]

[0133] Please refer to Figure 7 、 Figure 8 、 Figure 9 as well as Figure 10 , which are respectively the field curvature curve, distortion curve, axial chromatic aberration curve and vertical chromatic aberration curve of the optical lens 200. Figure 7 It can be seen that the field curvature is controlled within 0.05mm, indicating that the field curvature of the optical lens 200 is well corrected; Figure 8 It can be seen that the distortion is controlled within 2%, indicating that the optical lens 200 has good distortion correction. Figure 9 It can be seen from the figure that the offset of the axial chromatic aberration is within ±0.025 mm, indicating that the axial chromatic aberration of the optical lens 200 is well corrected. Figure 10 It can be seen from the figure that the vertical axial chromatic aberration between the shortest wave and the longest wave is controlled within ±1.5 μm, indicating that the vertical axial chromatic aberration of the optical lens 200 is well corrected. Figure 7 、 Figure 8 、 Figure 9 as well as Figure 10 It can be seen that the aberration of the optical lens 200 is well balanced, and has good optical imaging quality.

[0134] Third embodiment

[0135] like Figure 11 , which is a schematic structural diagram of the optical lens 300 provided in this embodiment. The optical lens 300 in this embodiment is substantially the same as the first embodiment described above, with the main differences being that the image side surface of the sixth lens is convex, the image side surface of the seventh lens is concave, and the curvature radius, aspheric coefficient, and thickness of each lens surface are different.

[0136] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0137] Table 5

[0138]

[0139]

[0140] The surface coefficients of the aspheric surfaces of the optical lens 300 in this embodiment are shown in Table 6.

[0141] Table 6

[0142]

[0143]

[0144] Please refer to Figure 12 、 Figure 13 、 Figure 14 as well as Figure 15 , which are respectively the field curvature curve, distortion curve, axial chromatic aberration curve and vertical chromatic aberration curve of the optical lens 300. Figure 12 It can be seen that the field curvature is controlled within 0.05mm, indicating that the field curvature of the optical lens 300 is well corrected; Figure 13 It can be seen that the distortion is controlled within 1.5%, indicating that the optical lens 300 has good distortion correction. Figure 14 It can be seen that the offset of the axial chromatic aberration is within ±0.035mm, indicating that the axial chromatic aberration of the optical lens 300 is well corrected; Figure 15 It can be seen from the figure that the vertical axial chromatic aberration between the shortest wave and the longest wave is controlled within ±4 μm, indicating that the vertical axial chromatic aberration of the optical lens 300 is well corrected. Figure 12 、 Figure 13 、 Figure 14 as well as Figure 15 It can be seen that the aberration of the optical lens 300 is well balanced, and has good optical imaging quality.

[0145] Please refer to Table 7, which shows the optical characteristics corresponding to the optical lenses provided in the above three embodiments, including the field of view FOV, total optical length TTL, actual half image height IH, effective focal length f of the optical lens, and the relevant values corresponding to each of the aforementioned conditional expressions.

[0146] Table 7

[0147]

[0148]

[0149] Compared with the prior art, the glass-plastic hybrid optical lens provided by the present invention has at least the following advantages:

[0150] (1) Achieve a balance between high pixel density and miniaturization. Because glass has better light transmittance and lower dispersion coefficient, the optical lens provided by the present invention uses one glass lens and six plastic lenses. The optical quality is basically the same as that of the current mainstream 8-lens plastic lens, and the light transmittance and optical performance are better, achieving a balance between high pixel density and miniaturization.

[0151] (2) It can achieve more layers of coating optimization. Currently, most plastic lens coatings use high-temperature processes. Under this process, plastic lenses are more likely to deform, resulting in a lower yield rate. Usually, the coating does not exceed 5 layers. Glass lenses have strong high-temperature resistance and can achieve more layers of coating to control reflections and glare, further improving the optical imaging quality.

[0152] (3) Ability to achieve large aperture performance. Since the surface shape and focal length of each lens are reasonably set, and the aperture is set before the first lens, the lens can have the characteristics of a large aperture, which increases the light flux entering the lens to a certain extent and reduces the impact of noise generated in insufficient light on the imaging picture. The lens can still have excellent imaging effects in a dark environment at night, thus meeting the imaging needs of bright and dark environments.

[0153] To sum up, the optical lens provided by the present invention adopts seven glass-plastic hybrid lenses. Through specific surface shape setting and reasonable optical focal length distribution, the structure of the optical lens is relatively compact, with a longer focal length, a larger aperture and higher imaging quality, and can match 50M high-pixel chips to achieve high-definition imaging; at the same time, through the reasonable selection of the glass material of the first lens and the use of aspheric surfaces, the aberration of the system can be reasonably corrected, so that the lens has high pixels while effectively shortening the overall length of the system, better meeting the miniaturization and high-image quality requirements of electronic equipment.

[0154] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0155] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: Aperture; a first lens having positive refractive power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; a second lens having negative optical power, wherein the object-side surface of the second lens is convex and the image-side surface of the second lens is concave; a third lens having positive optical power; a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is concave; a fifth lens having positive optical power, wherein the object-side surface of the fifth lens is concave and the image-side surface of the fifth lens is convex; a sixth lens having negative optical power, wherein the object-side surface of the sixth lens is concave; a seventh lens element having negative optical power, wherein the object-side surface of the seventh lens element is concave at a position near the optical axis; Wherein, the optical lens comprises at least one plastic lens and one glass lens; The optical lens satisfies the following conditional formula: 1.5 <f / IH<1.6; Wherein, IH represents half of 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.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.6 <f1 / f<1.05; 27mm<(Vd1 / Vd2)×f<32mm; Wherein, f1 represents the focal length of the first lens, f represents the effective focal length of the optical lens, Vd1 represents the Abbe number of the first lens, and Vd2 represents the Abbe number of the second lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 5 <f4 / f<30; 0.2 <R41 / R42<1; Among them, f4 represents the focal length of the fourth lens, f represents the effective focal length of the optical lens, R41 represents the curvature radius of the object side surface of the fourth lens, and R42 represents the curvature radius of the image side surface of the fourth lens.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -2 <f6 / f<-0.5; Wherein, f6 represents the focal length of the sixth lens, and f represents the effective focal length of the optical lens.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: -20 <f4 / f6<-5; Wherein, f4 represents the focal length of the fourth lens, and f6 represents the focal length of the sixth lens.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.3 <f7 / f6<1; Wherein, f6 represents the focal length of the sixth lens, and f7 represents the focal length of the seventh lens.

7. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 0.2 <CT1 / TTL<0.3; CT1 / CT2>3.5; 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 according to claim 1, wherein: The optical lens satisfies the following conditional formula: 1.5 <TTL / IH<1.8; 1 <TTL / f<1.2; Wherein, TTL represents the total optical length of the optical lens, IH represents half of 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.

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

10. The optical lens according to 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 all plastic aspherical lenses.

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