Optical lens and photographing device
By dividing the optical lens elements into a first group and a second group, and packaging them with independent lens barrels, the problem of high tolerance sensitivity during the assembly process of external teleconverters is solved, achieving high-resolution and miniaturized optical lenses, improving production yield and reducing costs.
Patent Information
- Application Number
- CN202610943193.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-29
- Publication Date
- 2026-08-25
AI Technical Summary
External teleconverters are highly tolerance-sensitive during assembly, leading to low production yield and increased manufacturing costs.
The lens elements of the optical lens are divided into a first group and a second group, and each group is packaged with an independent lens barrel. The tolerance is controlled by the structure of independent packaging of the groups, so as to avoid the transmission and superposition of lens eccentricity or tilting errors between different groups.
It significantly reduces the tolerance sensitivity caused by multiple lenses connected in series, improves mass production yield, and reduces manufacturing costs.
Smart Images
Figure CN122632435A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical imaging technology, specifically to an optical lens and a photographic device. Background Technology
[0002] With the increasing importance of mobile phone camera functions, telephoto shooting capability has become one of the key indicators for measuring image quality. Limited by the compact internal space of mobile devices, the magnification and sharpness of built-in telephoto lenses often fall short of the needs of long-distance shooting. Therefore, external teleconverters have emerged as accessories to extend telephoto shooting capabilities. However, external teleconverters in this technology still have significant drawbacks in practical applications. For example, they are highly sensitive to tolerances during assembly, and the cumulative errors of multi-lens systems can easily lead to low production yields, thereby increasing the overall manufacturing cost of the lens. It is evident that external teleconverters in this technology suffer from high tolerance sensitivity. Summary of the Invention
[0003] This application provides an optical lens and a photographic device that can solve the problem of high tolerance sensitivity of external teleconverters in related technologies.
[0004] In a first aspect, an optical lens is provided, the optical lens comprising a first group and a second group sequentially from the object side to the image side along the optical axis;
[0005] The first group is the objective lens section, which contains at least ten lenses, and the at least ten lenses include at least three sets of cemented doublet lenses;
[0006] The second group is the eyepiece portion, which includes at least four lenses, and the at least four lenses include at least one set of cemented doublet lenses;
[0007] The first group and the second group are respectively encapsulated by independent first and second lens tubes.
[0008] In a second aspect, a photographic device is provided, comprising an electronic device and the optical lens described in the first aspect.
[0009] In this embodiment, the lenses in the optical lens are divided into a first group and a second group according to the eyepiece and objective lens, and the first group and the second group are independently packaged using a first lens barrel and a second lens barrel, respectively. In this way, due to the structure of independent packaging of the groups, the global tolerance accumulation problem of the long optical system can be decomposed into the local tolerance control problem of two short optical systems. This helps to avoid the transmission and superposition of lens eccentricity or tilting errors between different groups. Compared with the integrated packaging solution, this physical isolation mechanism significantly reduces the tolerance sensitivity caused by the series connection of multiple lenses, making it easier to achieve the expected imaging quality indicators in the manufacturing process, thereby effectively improving the mass production yield and reducing the manufacturing cost. Attached Figure Description
[0010] Figure 1 This is one of the structural schematic diagrams of an optical lens applied to an imaging system in some embodiments of this application;
[0011] Figure 2 yes Figure 1 A schematic diagram of the 100 lp / mm defocus curve of the imaging system in the illustrated embodiment;
[0012] Figure 3 yes Figure 1 A schematic diagram of the on-axis chromatic aberration curve of the imaging system in the illustrated embodiment;
[0013] Figure 4 yes Figure 1 A schematic diagram of the optical distortion curve of the imaging system in the illustrated embodiment;
[0014] Figure 5 This is the second of several schematic diagrams showing the application of an optical lens in an imaging system according to some embodiments of this application.
[0015] Figure 6 yes Figure 5 A schematic diagram of the 100 lp / mm defocus curve of the imaging system in the illustrated embodiment;
[0016] Figure 7 yes Figure 5 A schematic diagram of the on-axis chromatic aberration curve of the imaging system in the illustrated embodiment;
[0017] Figure 8 yes Figure 5 A schematic diagram of the optical distortion curve of the imaging system in the illustrated embodiment. Detailed Implementation
[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.
[0019] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0020] The optical lens and imaging device provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.
[0021] Please see Figure 1 This application provides an optical lens, which includes a first group 200 and a second group 300 sequentially from the object side to the image side along the optical axis.
[0022] The first group 200 is the objective lens portion, which includes at least ten lenses, and the at least ten lenses include at least three sets of cemented doublet lenses;
[0023] The second group 300 is the eyepiece portion, which includes at least four lenses, and the at least four lenses include at least one set of cemented doublet lenses;
[0024] The first group 200 and the second group 300 are respectively encapsulated by a separate first lens barrel 270 and a second lens barrel 310.
[0025] The first group 200 mentioned above can be used to correct objective lens chromatic aberration, improve system resolution, and reduce lens size. Correspondingly, the second group 300 mentioned above can be used to improve eyepiece chromatic aberration correction efficiency and reduce lens size.
[0026] The aforementioned cemented doublet lens can be used to correct chromatic aberration. For example, two lenses with different Abbe numbers can be cemented together, using the difference in their Abbe numbers to cancel out the focal shift of different wavelengths of light, thereby achieving efficient axial chromatic aberration correction in a compact space.
[0027] The aforementioned optical lens can be used as an external teleconverter for various electronic products. It is understood that the optical lens can be used in conjunction with the shooting lens 100 in an electronic device; for example, the optical lens can be connected to the shooting lens 100 to achieve an external teleconverter attached to the object side of the shooting lens 100. In some embodiments of this application, when the optical lens and the shooting lens 100 are assembled together, the exit pupil position of the optical lens is configured to coincide with the entrance pupil position of the shooting lens 100. Thus, by setting at least ten lenses in the first group 200, and the at least ten lenses including at least three sets of cemented doublet lenses, and setting at least four lenses in the second group 300, and the at least four lenses including at least one set of cemented doublet lenses, and coordinating an optical path design where the exit pupil coincides with the entrance pupil of the shooting lens 100, it is possible to optimize the optical power distribution while ensuring high resolution and chromatic aberration correction effects, thereby significantly reducing the overall size and weight of the lens and improving portability.
[0028] The aforementioned camera lens 100 can be a lens from various electronic products, such as a mobile phone, tablet computer, action camera, or other portable electronic devices equipped with a rear camera module. In some embodiments of this application, the camera lens 100 can be a telephoto lens of a mobile phone.
[0029] The fact that the exit pupil position of the aforementioned optical lens is configured to coincide with the entrance pupil position of the shooting lens 100 means that the angle of the principal ray emitted by the optical lens matches the optimal angle at which the shooting lens 100 receives the light. This pupil alignment design has multiple technical benefits: on the one hand, it ensures seamless light energy transmission, avoiding edge field-of-view vignetting or light energy loss caused by pupil mismatch, and guaranteeing the brightness uniformity of the entire image plane; on the other hand, it makes the aberration correction between the external lens and the shooting lens continuous, preventing the introduction of additional off-axis aberrations due to beam truncation or abrupt angle changes.
[0030] During the operation of the optical lens, light enters the lens from the object side, first passing through the first group 200 for convergence and preliminary aberration correction, then entering the second group 300 for beam shaping and relay transmission, finally reaching the imaging lens 100. It should be noted that, although... Figure 1 The diagram shows two groups arranged coaxially. However, in other implementations, as long as the continuity of the optical path transmission is maintained, the specific arrangement of the lenses within each group can be adjusted according to the actual aberration correction requirements. That is, the two groups can also be arranged non-axially.
[0031] It is understood that the first group 200 is packaged through the first lens barrel 270, and the second group 300 is packaged through the second lens barrel 310, that is, the two groups are packaged separately.
[0032] Specifically, the first lens barrel 270 and the second lens barrel 310 are two independent housing components, each housing and fixing its corresponding lens group. That is, in this embodiment, not all lenses are installed within a single, continuous, long lens barrel. This grouped, independently packaged structural design essentially decomposes the global tolerance accumulation problem of a long optical system into the local tolerance control problem of two relatively independent short optical systems. For example, during assembly, the eccentricity or tilting error of the lenses within the first group 200 is confined within the first lens barrel 270 and will not be directly transmitted or superimposed on the second group 300; and vice versa.
[0033] In this embodiment, the lenses in the optical lens are divided into a first group 200 and a second group 300 according to the eyepiece and objective lens, and the first group 200 and the second group 300 are independently packaged using a first lens barrel 270 and a second lens barrel 310, respectively. In this way, due to the structure of independent packaging in different groups, the global tolerance accumulation problem of the long optical system can be decomposed into the local tolerance control problem of two short optical systems. This helps to avoid the transmission and superposition of lens eccentricity or tilting errors between different groups. Compared with the integrated packaging solution, this physical isolation mechanism significantly reduces the tolerance sensitivity caused by multiple lenses connected in series, making it easier to achieve the expected imaging quality indicators in the manufacturing process, thereby effectively improving the mass production yield and reducing the manufacturing cost.
[0034] Optionally, the at least three sets of cemented lenses in the first group 200 include a first cemented lens 210, a second cemented lens 220, and a third cemented lens 230;
[0035] The first cemented lens 210 includes a first lens 211 and a second lens 212, the second cemented lens 220 includes a third lens 221 and a fourth lens 222, and the third cemented lens 230 includes a fifth lens 231 and a sixth lens 232.
[0036] The refractive indices of the first lens 211 and the third lens 221 are both less than or equal to 1.60, and the Abbe numbers of the first lens 211 and the third lens 221 are both greater than or equal to 65.
[0037] The refractive index of the fifth lens 231 is greater than or equal to 1.85, and the Abbe number of the fifth lens 231 is less than or equal to 25.
[0038] It is understandable that, since the first lens 211, the third lens 221 and the fifth lens 231 are the main lenses of the first cemented lens 210, the second cemented lens 220 and the third cemented lens 230, when designing the first group 200, the material parameters of the first lens 211, the third lens 221 and the fifth lens 231 can be designed mainly, and the material parameters of the other lenses in the first group 200 can be set as needed.
[0039] The material combination of the first lens 211, the third lens 221 and the fifth lens 231 is beneficial for correcting objective lens chromatic aberration, improving system resolution and reducing lens size.
[0040] In this embodiment, by defining the material parameters of the key cemented lenses in the first group 200, the high Abbe number and low refractive index characteristics of the first lens 211 and the third lens 221 are combined with the high refractive index and low Abbe number characteristics of the fifth lens 231 to form strong dispersion complementarity. This enables efficient correction of axial chromatic aberration and magnification chromatic aberration at the objective lens end within a compact optical space. This reduces the size of the optical lens while improving the system resolution, which is beneficial for compressing the overall size and weight of the lens and improving the portability of the optical lens.
[0041] Optionally, the refractive index of the last lens closest to the image side in the second group 300 is greater than or equal to 1.8, and the Abbe number of the last lens is less than or equal to 50.
[0042] It is understandable that the refractive index nd_last and Abbe number vd_last of the last lens satisfy the relationship: nd_last≥1.8, vd_last≤50, which can improve the efficiency of eyepiece aberration correction and reduce the lens size.
[0043] In this embodiment, by setting a high-refractive-index lens at the position closest to the image side at the eyepiece end, it is possible to effectively converge light and correct field curvature and distortion isometric aberrations, thereby improving the efficiency of eyepiece aberration correction and maintaining good edge imaging quality even with a shortened back intercept and total length.
[0044] Optionally, the focal length of the first group 200 of the optical lens is f1, the focal length of the second group 300 is f2, the focal length of the shooting lens 100 is fs, and the focal length of the system after combining the optical lens and the shooting lens 100 is f, where 2.3 ≤ f / fs ≤ 3. .
[0045] In some embodiments of this application, when the optical lens is applied to an imaging system, the imaging system, along the optical axis from the object side to the image side, sequentially includes an external teleconverter, a mobile phone telephoto lens, and a photosensitive sensor assembly. The mobile phone telephoto lens serves as the aforementioned shooting lens 100, and the optical lenses are divided into a first group 200 and a second group 300.
[0046] In terms of optical lens structure assembly, the objective lens and eyepiece are grouped together, with the objective lens part in the first group 200 and the eyepiece part in the second group 300.
[0047] The focal length of the mobile phone telephoto lens is fs, and the focal length of the mobile phone telephoto lens and optical lens combination system is f, satisfying the relationship: 2.3≤f / fs≤3;
[0048] The focal length of the first group 200 of the optical lenses is f1, and the focal length of the second group 300 of the optical lenses is f2, satisfying the following relationship: 0.8≤|f1+f2| / f≤0.9;
[0049] The exit pupil of the optical lens coincides with the entrance pupil of the telephoto lens of the mobile phone.
[0050] The first group 200 of the optical lens contains at least ten lenses, including at least three groups of cemented doublet lenses, wherein the first lens 211 and the second lens 212 constitute the first cemented lens 210, the third lens 221 and the fourth lens 222 constitute the second cemented lens 220, and the fifth lens 231 and the sixth lens 232 constitute the third cemented lens 230.
[0051] The refractive index nd1 and Abbe number vd1 of the first lens 211 satisfy the following relationship: nd1≤1.60, vd1≥65;
[0052] The refractive index nd3 and Abbe number vd3 of the third lens 221 satisfy the following relationship: nd3≤1.60, vd3≥65;
[0053] The refractive index nd5 and Abbe number vd5 of the fifth lens 231 satisfy the following relationship: nd5≥1.85, vd5≤25;
[0054] The combination of these three lens materials corrects objective lens chromatic aberration, improves system resolution, and reduces lens size.
[0055] The second group of 300 of the shooting lens 100 contains at least four lenses, of which at least one set of cemented doublet lenses is included.
[0056] The refractive index nd_last and Abbe number vd_last of the last lens satisfy the following relationship: nd_last ≥ 1.8, vd_last ≤ 50; this is used to improve the efficiency of eyepiece aberration correction and reduce lens size.
[0057] It is understood that the above constraints can be used as constraints for the optical lens, wherein other lens parameters of the optical lens can be selected as needed.
[0058] In this embodiment, by rationally allocating the optical power burden of the objective lens and the eyepiece, the excessive curvature or thickness of the lens caused by excessive optical power of a single group is avoided, which is conducive to miniaturizing the total length of the lens while meeting the magnification requirements.
[0059] Optionally, the first group 200 consists of eleven lenses, including five groups of cemented doublet lenses and a ninth lens 250. The five groups of cemented doublet lenses include a first cemented lens 210, a second cemented lens 220, a third cemented lens 230, a fourth cemented lens 240, and a fifth cemented lens 260. The fourth cemented lens 240 includes a seventh lens 241 and an eighth lens 242. The fifth cemented lens 260 includes a tenth lens 261 and an eleventh lens 262.
[0060] The first lens 211, the second lens 212, the third lens 221, the fourth lens 222, the fifth lens 231, the sixth lens 232, the seventh lens 241, the eighth lens 242, the ninth lens 250, the tenth lens 261 and the eleventh lens 262 are arranged sequentially from the object side to the image side;
[0061] The first lens 211, the third lens 221, the fifth lens 231, the eighth lens 242, and the tenth lens 261 all have positive optical power; the second lens 212, the fourth lens 222, the sixth lens 232, the seventh lens 241, and the eleventh lens 262 all have negative optical power.
[0062] Wherein, f / fs=2.3, |f1+f2| / f=0.88; the refractive indices of the first lens 211 and the third lens 221 are both equal to 1.59, and the Abbe numbers of the first lens 211 and the third lens 221 are both greater than or equal to 68.6; the refractive index of the fifth lens 231 is equal to 1.92, and the Abbe number of the fifth lens 231 is equal to 20.8; the refractive index of the last lens is equal to 2.0, and the Abbe number of the last lens is equal to 25.4.
[0063] Please see Figure 1In some embodiments of this application, when the optical lens is applied to an imaging system, the imaging system, along the optical axis from the object side to the image side, sequentially includes an optical lens, a mobile phone telephoto lens, and a photosensitive sensor assembly. The optical lenses are divided into a first group 200 and a second group 300.
[0064] In terms of optical lens structure assembly, the objective lens and eyepiece are grouped together, with the objective lens part in the first group 200 and the eyepiece part in the second group 300.
[0065] The focal length of the mobile phone's telephoto lens is fs, and the focal length of the combined system of the mobile phone's telephoto lens and optical lens is f, satisfying the relationship: f / fs = 2.3
[0066] The focal length of the first group 200 of the optical lenses is f1, and the focal length of the second group 300 of the optical lenses is f2, satisfying the following relationship: |f1+f2| / f=0.88;
[0067] The exit pupil of the optical lens coincides with the entrance pupil of the telephoto lens of the mobile phone.
[0068] The first group 200 of the optical lens contains eleven lenses, including five cemented doublet lenses. The first lens 211 with positive optical power and the second lens 212 with negative optical power form the first cemented lens 210; the third lens 221 with positive optical power and the fourth lens 222 with negative optical power form the second cemented lens 220; the fifth lens 231 with positive optical power and the sixth lens 232 with negative optical power form the third cemented lens 230; the seventh lens 241 with negative optical power and the eighth lens 242 with positive optical power form the fourth cemented lens 240; and the tenth lens 261 with positive optical power and the eleventh lens 262 with negative optical power form the fifth cemented lens 260. The above cemented doublet lenses can correct system chromatic aberration and improve the sensitivity of lens assembly tolerance.
[0069] The refractive index nd1 and Abbe number vd1 of the first lens 211 satisfy the following relationship: nd1=1.59, vd1=68.6;
[0070] The refractive index nd3 and Abbe number vd3 of the third lens 221 satisfy the following relationship: nd3=1.59, vd3=68.6;
[0071] The refractive index nd5 and Abbe number vd5 of the fifth lens 231 satisfy the following relationship: nd5=1.92, vd5=20.8;
[0072] The combination of these three lens materials corrects objective lens chromatic aberration, improves system resolution, and reduces lens size.
[0073] The second group 300 of the optical lens contains at least four lenses, including at least one set of cemented doublet lenses.
[0074] The refractive index nd_last and Abbe number vd_last of the last lens satisfy the following relationship: nd_last=2.0, vd_last=25.4; this is used to improve the efficiency of eyepiece aberration correction and reduce the lens size.
[0075] Figure 1 The specifications of the illustrated embodiment are shown in Table 1-1 below:
[0076] Table 1-1 Specifications of External Telephoto Lens
[0077]
[0078] Where fs is the focal length of the mobile phone telephoto lens, f is the focal length of the combination system of the mobile phone telephoto lens and optical lens, f1 is the focal length of the first group of teleconverters (200), and f2 is the focal length of the second group of teleconverters (300). Table 1-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 1;
[0079] Table 1-2 Lens Data for Optical Lenses
[0080]
[0081] in, Figure 3 The five solid curves in the image represent colored light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. It can be seen that... Figure 1 In the illustrated embodiment, the axial chromatic aberration of the lens is controlled within a very small range, and the chromatic aberration convergence is good.
[0082] Depend on Figure 3 It can be seen that at a spatial frequency of 100 lp / mm, the MTF within a 0.9 field of view is greater than 0.7, indicating extremely high resolution.
[0083] In this embodiment, by combining optical architecture and lens elements, high resolution can be achieved while maintaining an overall teleconverter length of ≤80mm and an outer diameter of ≤27mm, making it smaller than the external lenses released by terminal manufacturers in related technologies. Simultaneously, by combining optical architecture and lens materials, the overall lens size can be reduced, increasing user portability; the smaller size also results in a lighter overall lens weight. By combining optical architecture and lens materials, and assembling the lenses in groups at the central imaging surface, lens assembly sensitivity is optimized, production yield is improved, and the overall lens cost is reduced. The central imaging surface is the connection point between the first group 200 and the second group 300.
[0084] Optionally, the first group 200 consists of ten lenses, including four sets of cemented doublet lenses, a seventh lens 241, and an eighth lens 242. The four sets of cemented doublet lenses include a first cemented lens 210, a second cemented lens 220, a third cemented lens 230, and a fourth cemented lens 240. The fourth cemented lens 240 includes a ninth lens 250 and a tenth lens 261.
[0085] The first lens 211, the second lens 212, the third lens 221, the fourth lens 222, the fifth lens 231, the sixth lens 232, the seventh lens 241, the eighth lens 242, the ninth lens 250, and the tenth lens 261 are arranged sequentially from the object side to the image side;
[0086] Wherein, f / fs=2.6, |f1+f2| / f=0.84; the refractive indices of the first lens 211 and the third lens 221 are both equal to 1.57, and the Abbe numbers of the first lens 211 and the third lens 221 are both greater than or equal to 71.3; the refractive index of the fifth lens 231 is equal to 1.92, and the Abbe number of the fifth lens 231 is equal to 20.9; the refractive index of the last lens is equal to 1.81, and the Abbe number of the last lens is equal to 46.5.
[0087] Please see Figure 5 In some embodiments of this application, when the optical lens is applied to an imaging system, the imaging system, along the optical axis from the object side to the image side, sequentially includes an optical lens, a mobile phone telephoto lens, and a photosensitive sensor assembly. The optical lenses are divided into a first group 200 and a second group 300.
[0088] In terms of optical lens structure assembly, the objective lens and eyepiece are grouped together, with the objective lens part in the first group 200 and the eyepiece part in the second group 300.
[0089] The focal length of the mobile phone telephoto lens is fs, and the focal length of the mobile phone telephoto lens and optical lens combination system is f, satisfying the relationship: f / fs=2.6;
[0090] The focal length of the first group 200 of the optical lenses is f1, and the focal length of the second group 300 of the optical lenses is f2, satisfying the following relationship: |f1+f2| / f=0.84;
[0091] The exit pupil of the optical lens coincides with the entrance pupil of the telephoto lens of the mobile phone.
[0092] The first group 200 of the optical lens contains ten lenses, including four groups of cemented doublet lenses. The first lens 211 and the second lens 212 form the first cemented lens 210, the third lens 221 and the fourth lens 222 form the second cemented lens 220, the fifth lens 231 and the sixth lens 232 form the third cemented lens 230, and the ninth lens 250 and the tenth lens 261 form the fourth cemented lens 240.
[0093] The refractive index nd1 and Abbe number vd1 of the first lens 211 satisfy the following relationship: nd1=1.57, vd1=71.3;
[0094] The refractive index nd3 and Abbe number vd3 of the third lens 221 satisfy the following relationship: nd3=1.57, vd3=71.3;
[0095] The refractive index nd5 and Abbe number vd5 of the fifth lens 231 satisfy the following relationship: nd5=1.92, vd5=20.9;
[0096] The combination of these three lens materials corrects objective lens chromatic aberration, improves system resolution, and reduces lens size.
[0097] The second group 300 of the optical lens contains at least four lenses, including at least one set of cemented doublet lenses.
[0098] The refractive index nd_last and Abbe number vd_last of the last lens satisfy the following relationship: nd_last=1.81, vd_last=46.5; this is used to improve the efficiency of eyepiece aberration correction and reduce the lens size.
[0099] Figure 5 The specifications of the illustrated embodiment are shown in Table 2-1 below:
[0100] Table 2-1 Specifications of External Telephoto Lens
[0101]
[0102] Where fs is the focal length of the mobile phone telephoto lens, f is the focal length of the combination system of the mobile phone telephoto lens and optical lens, f1 is the focal length of the first group of teleconverters (200), and f2 is the focal length of the second group of teleconverters (300). Table 2-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 2;
[0103] Table 2-2 Lens Data for Optical Lenses
[0104]
[0105] Figure 7The five solid curves in the image represent colored light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. Figure 7 It can be seen that, Figure 5 The axial chromatic aberration of the lens in the illustrated embodiment is controlled within a very small range, and the chromatic aberration convergence is good.
[0106] Depend on Figure 6 It can be seen that at a spatial frequency of 100 lp / mm, the MTF within a 0.9 field of view is greater than 0.7, indicating extremely high resolution.
[0107] In this embodiment, by combining optical architecture and lens elements, high resolution can be achieved while maintaining an overall teleconverter length of ≤80mm and an outer diameter of ≤27mm, making it smaller than the external lenses released by terminal manufacturers in related technologies. Simultaneously, by combining optical architecture and lens materials, the overall lens size can be reduced, increasing user portability; the smaller size also results in a lighter overall lens weight. By optimizing the combination of optical architecture and lens materials, and assembling the lenses in clusters at the central imaging plane, lens assembly sensitivity is improved, production yield is increased, and the overall lens cost is reduced.
[0108] Optionally, the overall length of the optical lens is less than or equal to 80 mm, and the outer diameter of the optical lens is less than or equal to 27 mm.
[0109] In this embodiment, by adjusting the optical architecture and lens configuration of the optical lens, the overall length of the teleconverter can be ≤80mm, the outer diameter ≤27mm, and the size is smaller than the external lenses released by terminal manufacturers in related technologies, thereby significantly reducing the overall size and weight of the lens and improving portability.
[0110] This application provides a photographing device, including an electronic device and the optical lens described in the above embodiments.
[0111] The electronic device may be a mobile phone, tablet computer, action camera, or other portable electronic device equipped with a rear camera module.
[0112] It is understood that the optical lens can be used as an external teleconverter and connected in conjunction with the rear camera module of an electronic device.
[0113] In this embodiment, since the photographing device includes the optical lens described in the above embodiments, the photographing device can realize all the processes of the optical lens in the above embodiments and has the same beneficial effects. To avoid repetition, it will not be described again here.
[0114] Optionally, the electronic device includes a shooting lens 100 and an image sensor 400, wherein the optical lens is disposed on the object side of the shooting lens 100, and the image sensor 400 is disposed on the image side of the shooting lens 100.
[0115] It is understood that the optical lens can be used as an external teleconverter and connected in conjunction with the camera lens 100 of an electronic device.
[0116] In some embodiments of this application, the optical lens, the capturing lens 100, and the image sensor 400 can collectively form an imaging system. The imaging system, along the optical axis from the object side to the image side, sequentially includes an external teleconverter, a mobile phone telephoto lens, and a photosensitive sensor assembly. The mobile phone telephoto lens serves as the capturing lens 100, and the optical lenses are divided into a first group 200 and a second group 300.
[0117] In terms of optical lens structure assembly, the objective lens and eyepiece are grouped together, with the objective lens part in the first group 200 and the eyepiece part in the second group 300.
[0118] The focal length of the mobile phone telephoto lens is fs, and the focal length of the mobile phone telephoto lens and optical lens combination system is f, satisfying the relationship: 2.3≤f / fs≤3;
[0119] The focal length of the first group 200 of the optical lenses is f1, and the focal length of the second group 300 of the optical lenses is f2, satisfying the following relationship: 0.8≤|f1+f2| / f≤0.9;
[0120] The exit pupil of the optical lens coincides with the entrance pupil of the telephoto lens of the mobile phone.
[0121] The first group 200 of the optical lens contains at least ten lenses, including at least three groups of cemented doublet lenses, wherein the first lens 211 and the second lens 212 constitute the first cemented lens 210, the third lens 221 and the fourth lens 222 constitute the second cemented lens 220, and the fifth lens 231 and the sixth lens 232 constitute the third cemented lens 230.
[0122] The refractive index nd1 and Abbe number vd1 of the first lens 211 satisfy the following relationship: nd1≤1.60, vd1≥65;
[0123] The refractive index nd3 and Abbe number vd3 of the third lens 221 satisfy the following relationship: nd3≤1.60, vd3≥65;
[0124] The refractive index nd5 and Abbe number vd5 of the fifth lens 231 satisfy the following relationship: nd5≥1.85, vd5≤25;
[0125] The combination of these three lens materials corrects objective lens chromatic aberration, improves system resolution, and reduces lens size.
[0126] The second group of 300 of the shooting lens 100 contains at least four lenses, of which at least one set of cemented doublet lenses is included.
[0127] The refractive index nd_last and Abbe number vd_last of the last lens satisfy the following relationship: nd_last ≥ 1.8, vd_last ≤ 50; this is used to improve the efficiency of eyepiece aberration correction and reduce lens size.
[0128] In some embodiments of this application, the imaging system may be Figure 1 The imaging system shown in the illustrated embodiment. In some embodiments of this application, the imaging system may be... Figure 5 The imaging system in the illustrated embodiment. Wherein, Figure 1 and Figure 5 The photosensitive sensor component in the image sensor 400 can be used as the image sensor.
[0129] In this embodiment, by including a shooting lens 100 and an image sensor 400 in the electronic device, with the optical lens disposed on the object side of the shooting lens 100 and the image sensor 400 disposed on the image side of the shooting lens 100, the optical lens can serve as an external teleconverter for the shooting lens 100 to improve the shooting performance of the shooting lens 100.
[0130] Optionally, the focal length of the first group 200 of the optical lens is f1, the focal length of the second group 300 is f2, the focal length of the shooting lens 100 is fs, and the focal length of the system after combining the optical lens and the shooting lens 100 is f, where 2.3 ≤ f / fs ≤ 3. .
[0131] In this embodiment, by rationally allocating the optical power burden of the objective lens and the eyepiece, the excessive curvature or thickness of the lens caused by excessive optical power of a single group is avoided, which is conducive to miniaturizing the total length of the lens while meeting the magnification requirements.
[0132] Optionally, when the first group 200 consists of eleven lenses, f / fs=2.3, |f1+f2| / f=0.88; or,
[0133] When the first group 200 consists of ten lenses, f / fs = 2.6, |f1+f2| / f = 0.84
[0134] It is understood that the case where the first group 200 consists of eleven lenses can mean that the first group 200 consists of eleven lenses, the eleven lenses including five groups of cemented doublet lenses and a ninth lens 250. The five groups of cemented doublet lenses include a first cemented lens 210, a second cemented lens 220, a third cemented lens 230, a fourth cemented lens 240, and a fifth cemented lens 260; the fourth cemented lens 240 includes a seventh lens 241 and an eighth lens 242; the fifth cemented lens 260 includes a tenth lens 261 and an eleventh lens 262; the first lens 211, the second lens 212, the third lens 221, the fourth lens 222, the fifth lens 231, the sixth lens 232, the seventh lens 241, the eighth lens 242, the ninth lens 250, the tenth lens 260, the seventh lens 241, the eighth lens 242, the ninth lens 250, the ninth lens 26 ... Lens 261 and the eleventh lens 262 are arranged sequentially from the object side to the image side; the first lens 211, the third lens 221, the fifth lens 231, the eighth lens 242, and the tenth lens 261 all have positive optical power; the second lens 212, the fourth lens 222, the sixth lens 232, the seventh lens 241, and the eleventh lens 262 all have negative optical power; wherein, the refractive index of the first lens 211 and the third lens 221 are both equal to 1.59, and the Abbe number of the first lens 211 and the third lens 221 is both greater than or equal to 68.6; the refractive index of the fifth lens 231 is equal to 1.92, and the Abbe number of the fifth lens 231 is equal to 20.8; the refractive index of the last lens is equal to 2.0, and the Abbe number of the last lens is equal to 25.4.
[0135] Accordingly, the case where the first group 200 consists of ten lenses can mean that the first group 200 consists of ten lenses, the ten lenses including four sets of cemented doublet lenses, a seventh lens 241 and an eighth lens 242, the four sets of cemented doublet lenses including a first cemented lens 210, a second cemented lens 220, a third cemented lens 230 and a fourth cemented lens 240; the fourth cemented lens 240 includes a ninth lens 250 and a tenth lens 261; The first lens 211, the second lens 212, the third lens 221, the fourth lens 222, the fifth lens 231, the sixth lens 232, the seventh lens 241, the eighth lens 242, the ninth lens 250, and the tenth lens 261 are arranged sequentially from the object side to the image side; wherein, the refractive index of the first lens 211 and the third lens 221 are both equal to 1.57, and the Abbe number of the first lens 211 and the third lens 221 is both greater than or equal to 71.3; the refractive index of the fifth lens 231 is equal to 1.92, and the Abbe number of the fifth lens 231 is equal to 20.9; the refractive index of the last lens is equal to 1.81, and the Abbe number of the last lens is equal to 46.5.
[0136] In this embodiment, by combining optical architecture and lens elements, high resolution can be achieved while maintaining an overall teleconverter length of ≤80mm and an outer diameter of ≤27mm, making it smaller than the external lenses released by terminal manufacturers in related technologies. Simultaneously, by combining optical architecture and lens materials, the overall lens size can be reduced, increasing user portability; the smaller size also results in a lighter overall lens weight. By optimizing the combination of optical architecture and lens materials, and assembling the lenses in clusters at the central imaging plane, lens assembly sensitivity is improved, production yield is increased, and the overall lens cost is reduced.
[0137] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. An optical lens, characterized in that, The optical lens includes a first group and a second group sequentially from the object side to the image side along the optical axis; The first group is the objective lens section, which contains at least ten lenses, and the at least ten lenses include at least three sets of cemented doublet lenses; The second group is the eyepiece portion, which includes at least four lenses, and the at least four lenses include at least one set of cemented doublet lenses; The first group and the second group are respectively encapsulated by independent first and second lens tubes.
2. The optical lens according to claim 1, characterized in that, The at least three sets of cemented doublet lenses in the first group include a first cemented lens, a second cemented lens, and a third cemented lens; The first cemented lens includes a first lens and a second lens, the second cemented lens includes a third lens and a fourth lens, and the third cemented lens includes a fifth lens and a sixth lens; The refractive index of both the first lens and the third lens is less than or equal to 1.60, and the Abbe number of both the first lens and the third lens is greater than or equal to 65. The refractive index of the fifth lens is greater than or equal to 1.85, and the Abbe number of the fifth lens is less than or equal to 25.
3. The optical lens according to claim 2, characterized in that, The refractive index of the last lens closest to the image side in the second group is greater than or equal to 1.8, and the Abbe number of the last lens is less than or equal to 50.
4. The optical lens according to claim 3, characterized in that, The first group consists of eleven lenses, including five sets of cemented doublet lenses and a ninth lens. The five sets of cemented doublet lenses include a first cemented lens, a second cemented lens, a third cemented lens, a fourth cemented lens, and a fifth cemented lens. The fourth cemented lens includes a seventh lens and an eighth lens. The fifth cemented lens includes a tenth lens and an eleventh lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens are arranged sequentially from the object side to the image side; The first lens, the third lens, the fifth lens, the eighth lens, and the tenth lens all have positive optical power; the second lens, the fourth lens, the sixth lens, the seventh lens, and the eleventh lens all have negative optical power. The first and third lenses both have a refractive index of 1.59 and an Abbe number greater than or equal to 68.6; the fifth lens has a refractive index of 1.92 and an Abbe number of 20.8; and the last lens has a refractive index of 2.0 and an Abbe number of 25.
4.
5. The optical lens according to claim 3, characterized in that, The first group consists of ten lenses, including four sets of cemented doublet lenses, a seventh lens, and an eighth lens. The four sets of cemented doublet lenses include a first cemented lens, a second cemented lens, a third cemented lens, and a fourth cemented lens. The fourth cemented lens includes a ninth lens and a tenth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged sequentially from the object side to the image side; The first and third lenses both have a refractive index of 1.57 and an Abbe number greater than or equal to 71.3; the fifth lens has a refractive index of 1.92 and an Abbe number of 20.9; and the last lens has a refractive index of 1.81 and an Abbe number of 46.
5.
6. The optical lens according to claim 1, characterized in that, The overall length of the optical lens is less than or equal to 80mm, and the outer diameter of the optical lens is less than or equal to 27mm.
7. A photographing device, characterized in that, Includes electronic devices and optical lenses as described in any one of claims 1-6.
8. The photographing device according to claim 7, characterized in that, The electronic device includes a camera lens and an image sensor, wherein the optical lens is disposed on the object side of the camera lens; and the image sensor is disposed on the image side of the camera lens.
9. The photographing device according to claim 8, characterized in that, The focal length of the first group of optical lenses is f1, the focal length of the second group is f2, the focal length of the shooting lens is fs, and the focal length of the system combining the optical lenses and the shooting lens is f, where 2.3 ≤ f / fs ≤ 3. .
10. The photographing device according to claim 9, characterized in that, When the first group consists of eleven lenses, f / fs = 2.3, |f1+f2| / f = 0.88; or, When the first group consists of ten lenses, f / fs=2.6, |f1+f2| / f=0.84.