CN112596205B - Optical lens group, camera module and electronic device - Google Patents
Optical lens group, camera module and electronic device Download PDFInfo
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- CN112596205B CN112596205B CN202011488479.XA CN202011488479A CN112596205B CN 112596205 B CN112596205 B CN 112596205B CN 202011488479 A CN202011488479 A CN 202011488479A CN 112596205 B CN112596205 B CN 112596205B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The application discloses an optical lens group, a camera module and an electronic device, and belongs to the technical field of optical imaging; the optical lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object plane to an image plane along an optical axis in sequence. According to the embodiment of the application, through the reasonable design of the bending force and the surface type of the first lens to the eighth lens, the miniaturization structural design can be met, the resolving power can be improved, and a shot picture is more vivid and has high resolution.
Description
Technical Field
The application relates to the technical field of optical imaging, in particular to an optical lens group, a camera module and an electronic device.
Background
Along with the wide application of electronic products such as cell-phone, panel computer, unmanned aerial vehicle, computer in the life, the shooting effect of camera lens becomes the focus of people's attention among the electronic product, becomes an important content of science and technology improvement simultaneously. However, in the conventional optical imaging technology, the imaging element cannot meet the requirements of miniaturization and high-definition shooting at the same time.
Disclosure of Invention
The embodiment of the application provides an optical lens group, camera module and electron device, when satisfying miniaturized structural design, can also satisfy the image of shooting high resolution, improve analytic power.
In a first aspect, an embodiment of the present application provides an optical lens assembly, where the optical lens assembly has eight lenses with refractive power, and the eight lenses sequentially include, from an object plane to an image plane along an optical axis:
a first lens element with positive refractive power, wherein an object-side surface of the first lens element is convex near the optical axis, and an image-side surface of the first lens element is convex near the optical axis;
a second lens element having a negative refractive power, an image-side surface of the second lens element being concave in the vicinity of the optical axis;
a third lens element with positive refractive power, wherein an object-side surface of the third lens element is convex near the optical axis, and an image-side surface of the third lens element is concave near the optical axis;
a fourth lens element having a negative refractive power, an object-side surface of the fourth lens element being concave in the vicinity of the optical axis;
a fifth lens element with a bending force, wherein an object-side surface of the fifth lens element is concave near the optical axis, and an image-side surface of the fifth lens element is convex near the optical axis;
a sixth lens having a negative bending force;
a seventh lens having a bending force;
the eighth lens element with refractive power has a convex object-side surface near the optical axis and a concave image-side surface near the optical axis.
The optical lens group of the embodiment of the application not only can meet the requirement of a miniaturized structural design through the reasonable design of the bending force and the surface type of the first lens to the eighth lens, but also can improve the resolving power, so that the shot picture is more vivid and has high resolution.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.1mm-1<FNO/EFL<0.4mm-1；
and the FNO is the f-number of the optical lens group, and the EFL is the focal length of the optical lens group.
Based on the embodiment, the diaphragm number of the optical lens group and the focal length of the optical lens group are reasonably limited, so that the sufficient light entering amount is provided for long-distance shooting, the bright picture is ensured during shooting, the blurring of the background of the subject is large, and the shooting effect of the main body is highlighted. Meanwhile, the high-quality object space scenes with low brightness, such as night scenes, starry sky scenes and the like, can be shot under the condition of common or worse light brightness. When the lower limit of the limited range is exceeded, the shooting performance of the large aperture cannot be realized, specifically, the purpose of highlighting background blurring cannot be achieved under normal shooting conditions, and the shooting effect under dark light conditions cannot be guaranteed. When the upper limit of the above-defined range is exceeded, the telephoto performance of the telephoto lens cannot be achieved.
In some embodiments, the optical lens group further satisfies the following conditional expression:
FNO<1.95；
and the FNO is the f-number of the optical lens group.
Based on the embodiment, the diaphragm number of the optical lens group is reasonably limited, so that the sufficient light incoming amount is provided for shooting, the bright picture is ensured during shooting, the blurring of the background of the subject is large, and the effect of shooting the main body is highlighted. Meanwhile, the shooting can be carried out under the condition that the light brightness is normal or worse, and the purpose of shooting high-quality object space scenes such as night scenes, starry sky scenes and the like with low brightness is achieved. When the lower limit of the above-defined range is exceeded, marginal rays may enter the system too much to degrade the resolution of the external field of view. When the upper limit of the above-mentioned limited range is exceeded, the purpose of making the background blurring and emphasizing under the normal shooting condition cannot be achieved, and the shooting effect under the dark light condition cannot be ensured.
In some embodiments, abbe numbers of the first lens and the third lens are the same, abbe numbers of the second lens and the fourth lens are the same, and the optical lens group further satisfies the following conditional expressions:
Vd1>50；
Vd2<50; and is
0.1<Vd1/Vd2<0.4；
Wherein, Vd1Is Abbe number, Vd, of the first lens2Is the abbe number of the second lens.
Based on the above embodiment, since the abbe number represents the strong and weak dispersion coefficient of the lens material, the dispersion coefficient is greater than 50 for the low dispersion material, the dispersion coefficient is less than 50 for the high dispersion material, and the first four lenses of the first lens, the second lens, the third lens and the fourth lens are designed by combining the low dispersion material and the high dispersion material to compensate the dispersion with each other to achieve the purpose of achromatism, the abbe numbers of the first lens and the third lens must be greater than 50, and the abbe numbers of the second lens and the fourth lens must be less than 50. When the upper limit and the lower limit of the above-mentioned range are exceeded, the object of achromatization cannot be achieved.
In some embodiments, the optical lens group further includes a diaphragm, and the optical lens group further satisfies the following conditional expression:
0.2<DL/Imgh<0.5；
wherein DL is the diameter of the diaphragm, and Imgh is the image height corresponding to the maximum field angle of the optical lens group.
Based on the embodiment, the diameter of the diaphragm and the image height corresponding to the maximum field angle of the optical lens group are reasonably limited, so that the sufficient light transmission amount is favorably ensured, and the definition of a shot image is ensured. When the lower limit of the above-mentioned limit range is exceeded, the amount of light passing is insufficient, and when the relative brightness of light is insufficient, the image clarity is lowered. When the upper limit of the above-mentioned limited range is exceeded, the exposure is too large, the luminance is too high, and the picture quality is affected.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.3<sin(FOV)/FNO<0.6；
wherein, FOV is the maximum field angle of the optical lens group, and FNO is the f-number of the optical lens group.
Based on the above embodiment, the requirement of high-definition shooting and imaging can be met only by reasonably matching the maximum field angle of the optical lens group with the f-number of the optical lens group because the focal length is longer and the corresponding field angle is smaller than that of a common lens on the premise of meeting the structural miniaturization and having the long-focus large aperture. When the lower limit of the above-defined range is exceeded, the light entering the system is relatively increased, which may cause blurring of the image in the marginal field of view. When the image exceeds the upper limit of the limited range, the field angle of the optical lens group is too large, which causes too large distortion of the external field, distortion phenomenon at the periphery of the image and reduced imaging performance.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.2mm-1<FNO/TTL<0.4mm-1；
wherein, TTL is a distance from the object side surface of the first lens element to the image plane on the optical axis, and FNO is an f-number of the optical lens group.
Based on the above embodiment, the distance from the object side surface of the first lens to the image surface on the optical axis and the f-number of the optical lens group are reasonably limited, so that the optical lens group can simultaneously meet the design requirements of large aperture and miniaturization of the lens system, simultaneously provide enough light flux for shooting, can make the picture more vivid by highlighting the theme in background blurring, and can meet the requirement of high-quality and high-definition shooting under the dim light condition. When the lower limit of the limited range is exceeded, the system structure is compact, the difficulty of the production process is increased, and the assembly yield is reduced. When the light quantity exceeds the upper limit of the limited range, the light quantity of the optical system is insufficient while the optical system is miniaturized, the shooting effect under the dark light condition such as a starry sky night scene cannot be realized, and the definition of a shot picture is reduced.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.1<FBL/TTL<0.3；
the FBL is a distance from an image side surface of the eighth lens to the image plane on the optical axis, and the TTL is a distance from an object side surface of the first lens to the image plane on the optical axis.
Based on the above embodiment, through the reasonable limitation to the distance from the image side surface of the eighth lens to the image surface on the optical axis and the distance from the object side surface of the first lens to the image surface on the optical axis, the system is favorably ensured to have a sufficient focusing range, the assembly yield of the lens module is improved, the focal depth of the optical system is ensured to be larger, and more depth information of an object space can be acquired.
In some embodiments, the optical lens group further satisfies the following conditional expression:
-0.8<f1/f2<0；
wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
Based on the above embodiments, the first lens element provides positive refractive power for the optical lens assembly, which is beneficial for collecting object space light, and the second lens element provides negative refractive power for the optical lens assembly, which can make light diverge and meet the requirement of image height. The negative and positive combination of the two not only effectively compresses the system volume, realizes the miniaturization design requirement, but also well corrects the aberration and the curvature of field of the whole optical system. Therefore, the focal length of the first lens and the focal length of the second lens are reasonably limited, the total length of the system can be reduced by ensuring the provided bending force value, and the miniaturization design requirement is met.
In some embodiments, the optical lens group further includes a diaphragm, and the optical lens group further satisfies the following conditional expression:
0.2<DL/TTL<1；
and DL is the diameter of the diaphragm, and TTL is the distance from the object side surface of the first lens to the image plane on the optical axis.
Based on the embodiment, the diameter of the diaphragm and the distance from the object side surface of the first lens to the image surface on the optical axis are reasonably limited, so that the miniaturization design of the lens is guaranteed, the light flux required by the lens shooting is provided, and the high-definition shooting effect with high image quality is realized. When the light quantity exceeds the lower limit of the limited range, the aperture of the diaphragm light transmission is too small, the light transmission quantity of a system cannot be met, and the high-definition shooting requirement of a dark light scene cannot be met. When the upper limit of the limited range is exceeded, the light-transmitting aperture is too large, so that marginal light rays enter an imaging system, and the imaging quality is reduced.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.4<SDs1/EFL<0.7；
wherein, SDs1The effective diameter of the object side surface of the first lens element is defined, and the EFL is the focal length of the optical lens assembly.
Based on the above embodiment, since the size of the diameter of the first lens element determines the size of the light entering into the space, the effective diameter of the object-side surface of the first lens element and the focal length of the optical lens assembly are reasonably limited, so that the lens can be ensured to simultaneously satisfy the performances of a long focus and a large aperture, and provide sufficient light entering amount for long-distance image pickup, and ensure that the picture is brighter when shooting, the background of the subject is blurred, thereby achieving the effect of highlighting the main body, and simultaneously ensuring that high-quality night scenes, starry sky scenes and other object space scenes with low brightness can be shot under the condition of general or worse light brightness. When the lower limit of the above-mentioned limited range is exceeded, sufficient brightness cannot be provided for photographing, and the photographing effect under a dark light condition cannot be ensured. When the upper limit of the above-defined range is exceeded, the telephoto performance of the telephoto lens cannot be achieved.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.8<EFL/TTL<1.2；
wherein, EFL is the focal length of the optical lens group, and TTL is the distance between the object side surface of the first lens element and the image surface on the optical axis.
Based on above-mentioned embodiment, through the focus to optical lens group, the object side of first lens to the reasonable injecing of image plane distance on the optical axis, be favorable to realizing that optical lens structure is miniaturized and compromise the long focal performance, can guarantee simultaneously that light better assembles on the imaging surface, improve imaging quality, guarantee the authenticity of image. When the optical length of the optical lens group exceeds the lower limit of the above-mentioned limited range, the optical length of the optical lens group is too short, which increases the sensitivity of the system and is not favorable for the convergence of light on the image plane. When the optical length of the optical lens group exceeds the upper limit of the limited range, the angle of the chief ray of the light entering the imaging surface is too large, so that the marginal light of the imaging surface of the system cannot be imaged on the photosensitive surface, and finally imaging information is incomplete.
In some embodiments, the optical lens group further satisfies the following conditional expression:
0.4<f4/Rs7<1.6；
wherein f is4Is the focal length of the fourth lens, Rs7Is a radius of curvature of an object-side surface of the fourth lens at the optical axis.
Based on the above embodiment, by reasonably defining the focal length of the fourth lens element and the curvature radius of the object-side surface of the fourth lens element on the optical axis, the shape and focal power of the fourth lens element can be effectively controlled, so that the focal power of the fourth lens element is matched with the focal power of the optical imaging system, thereby facilitating the mutual balance of the focal powers of the respective lens elements. When the lower limit of the above-mentioned range is exceeded, the fourth lens shape is not smooth enough, the sensitivity of the whole system is affected, and the production yield is reduced. When the upper limit of the above-defined range is exceeded, the focal length of the fourth lens is made larger, which is disadvantageous for the balance of the respective lenses.
In some embodiments, the optical lens group further satisfies the following conditional expression:
-0.4mm-1<(Rs9+Rs10)/(Rs9*Rs10)<-0.1mm-1；
wherein R iss9Is a radius of curvature, R, of an object-side surface of the fifth lens at the optical axiss10The radius of curvature of the image side surface of the fifth lens at the optical axis.
Based on the above embodiment, by reasonably defining the curvature radius of the object side surface of the fifth lens element at the optical axis and the curvature radius of the image side surface of the fifth lens element at the optical axis, the optical path difference between the marginal ray and the paraxial ray of the optical system and the correction of the field curvature and astigmatism are facilitated to be balanced, and meanwhile, the system sensitivity is reduced and the assembly stability is improved. When the lower limit of the above-defined range is exceeded, the field curvature of the optical system is excessively large. When the upper limit of the above-defined range is exceeded, the sensitivity of the system is increased, and the production yield is lowered.
In a second aspect, an embodiment of the present application provides a camera module, including:
a lens barrel;
the optical lens group is arranged in the lens cone; and
the photosensitive element is arranged on the image side of the optical lens group.
Based on the camera module in this application embodiment, through the tortuous power and the rational design of face type to first lens to eighth lens, not only can satisfy miniaturized structural design, can also improve analytic power, the picture that makes the shooting is more vivid and has the high resolution.
In a third aspect, an embodiment of the present application provides an electronic apparatus, including:
a housing; and
in the camera module, the camera module is arranged in the shell.
Based on the electronic device in the embodiment of the application, through the reasonable design of the bending force and the surface shape of the first lens to the eighth lens, the electronic device not only can meet the requirement of a miniaturized structural design, but also can improve the analytic force, so that the shot picture is more vivid and has high resolution.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens assembly according to an embodiment of the present disclosure;
fig. 2 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical lens assembly provided in the second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly according to the second embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical lens assembly provided in the third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly provided in the third embodiment of the present application;
fig. 7 is a schematic structural diagram of an optical lens assembly provided in the fourth embodiment of the present application;
fig. 8 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly provided in the fourth embodiment of the present application.
Fig. 9 is a schematic structural diagram of an optical lens assembly provided in the fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly provided in the fifth embodiment of the present application;
fig. 11 is a schematic structural diagram of an optical lens assembly according to a sixth embodiment of the present application;
fig. 12 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an optical lens assembly provided in example six of the present application;
fig. 13 is a schematic structural diagram of an optical lens assembly provided in a seventh embodiment of the present application;
fig. 14 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly provided in the seventh embodiment of the present application;
fig. 15 is a schematic structural diagram of an optical lens assembly according to an eighth embodiment of the present application;
fig. 16 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly according to the eighth embodiment of the present application.
Fig. 17 is a schematic structural diagram of an optical lens assembly provided in embodiment nine of the present application;
fig. 18 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly provided in the ninth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
Along with the wide application of electronic products such as mobile phones, tablet computers, unmanned aerial vehicles and computers in life, the shooting effect of the camera lens in the electronic products becomes the focus of attention of people and becomes an important content of science and technology improvement. However, in the existing optical imaging technology, the image pickup device cannot meet the requirements of miniaturization and high-definition shooting at the same time. Accordingly, the embodiment of the present application provides an optical lens assembly, a camera module and an electronic device, which aim to solve the above technical problems.
In a first aspect, an embodiment of the present application provides an optical lens group. As shown in fig. 1, 3, 5, 7, 9, 11, 13, 15, and 17, the optical lens group includes eight lenses having refractive power, and the eight lenses include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an eighth lens 180 in order from an object plane to an image plane along an optical axis.
The first lens element 110 has positive refractive power, an object-side surface of the first lens element 110 is convex near an optical axis, and an image-side surface of the first lens element 110 is convex near the optical axis. The second lens element 120 has negative refractive power, and the image-side surface of the second lens element 120 is concave near the optical axis. The third lens element 130 has positive refractive power, and an object-side surface of the third lens element 130 is convex near an optical axis, and an image-side surface of the third lens element 130 is concave near the optical axis. The fourth lens element 140 has a negative bending force, and the object-side surface of the fourth lens element 140 is concave near the optical axis. The fifth lens element 150 has a refractive power, and an object-side surface of the fifth lens element 150 is concave near an optical axis, and an image-side surface of the fifth lens element 150 is convex near the optical axis. The sixth lens 160 has a negative bending force. The seventh lens 170 has a bending force. The eighth lens element 180 has a refractive power, and an object-side surface of the eighth lens element 180 is convex near an optical axis, and an image-side surface of the eighth lens element 180 is concave near the optical axis.
The optical lens group of the embodiment of the application not only can satisfy the miniaturized structural design, but also can make the shot picture more vivid and have high resolution through the reasonable design of the bending force and the surface type of the first lens 110 to the eighth lens 180.
The optical lens group further satisfies the following conditional expression: 0.1mm-1<FNO/EFL<0.4mm-1And the FNO is the f-number of the optical lens group, and the EFL is the focal length of the optical lens group. Based on the embodiment, the diaphragm number of the optical lens group and the focal length of the optical lens group are reasonably limited, so that the sufficient light entering amount is provided for long-distance shooting, the bright picture is ensured during shooting, the blurring of the background of the subject is large, and the shooting effect of the main body is highlighted. Meanwhile, the high-quality object space scenes with low brightness, such as night scenes, starry sky scenes and the like, can be shot under the condition of common or worse light brightness. When the lower limit of the above-defined range is exceededThe shooting performance of the large aperture cannot be realized, specifically, the purpose of highlighting background blurring under normal shooting conditions cannot be achieved, and the shooting effect under dim light conditions cannot be guaranteed. When the upper limit of the above-defined range is exceeded, the telephoto performance of the telephoto lens cannot be achieved.
The optical lens group further satisfies the following conditional expression: FNO <1.95, wherein FNO is the f-number of the optical lens group. Based on the embodiment, the diaphragm number of the optical lens group is reasonably limited, so that the sufficient light incoming amount is provided for shooting, the bright picture is ensured during shooting, the blurring of the background of the subject is large, and the effect of shooting the main body is highlighted. Meanwhile, the shooting can be carried out under the condition that the light brightness is normal or worse, and the purpose of shooting high-quality object space scenes such as night scenes, starry sky scenes and the like with low brightness is achieved. When the lower limit of the above-defined range is exceeded, marginal rays may enter the system too much to degrade the resolution of the external field of view. When the upper limit of the above-mentioned limited range is exceeded, the purpose of making the background blurring and emphasizing under the normal shooting condition cannot be achieved, and the shooting effect under the dark light condition cannot be ensured.
The abbe numbers of the first lens element 110 and the third lens element 130 are the same, the abbe numbers of the second lens element 120 and the fourth lens element 140 are the same, and the optical lens group further satisfies the following conditional expressions: vd1>50，Vd2<50 and 0.1<Vd1/Vd2<0.4, wherein, Vd1Is the Abbe number, Vd, of the first lens 1102Is the abbe number of the second lens 120. Based on the above embodiment, since the abbe number represents the strong and weak dispersion coefficients of the lens material, the dispersion coefficient is greater than 50 for low dispersion materials, the dispersion coefficient is less than 50 for high dispersion materials, and the first four lenses of the first lens 110, the second lens 120, the third lens 130 and the fourth lens 140 are designed by combining the low dispersion materials and the high dispersion materials to compensate the dispersion with each other to achieve the purpose of achromatism, the abbe numbers of the first lens 110 and the third lens 130 must be greater than 50, and the abbe numbers of the second lens 120 and the fourth lens 140 must be less than 50. When the content of the unsaturated polyester compound exceeds the upper limit or the lower limit of the above-mentioned range, the object of achromatization cannot be achieved.
The optical lens group can further comprise a diaphragm, and the optical lens group further meets the following conditions: 0.2< DL/Imgh <0.5, wherein DL is the diameter of the diaphragm, and Imgh is the image height corresponding to the maximum field angle of the optical lens group. Based on the embodiment, the diameter of the diaphragm and the image height corresponding to the maximum field angle of the optical lens group are reasonably limited, so that the sufficient light transmission amount is favorably ensured, and the definition of a shot image is ensured. When the lower limit of the above-mentioned limit range is exceeded, the amount of light passing is insufficient, and when the relative brightness of light is insufficient, the image clarity is lowered. When the upper limit of the above-mentioned limited range is exceeded, the exposure is too large, the luminance is too high, and the picture quality is affected.
The optical lens group further satisfies the following conditional expression: 0.3< sin (FOV)/FNO <0.6, wherein FOV is the maximum field angle of the optical lens set and FNO is the f-number of the optical lens set. Based on the above embodiment, the requirement of high-definition shooting and imaging can be met only by reasonably matching the maximum field angle of the optical lens group with the f-number of the optical lens group because the focal length is longer and the corresponding field angle is smaller than that of a common lens on the premise of meeting the structural miniaturization and having the long-focus large aperture. When the lower limit of the above-defined range is exceeded, the light entering the system is relatively increased, which may cause blurring of the image in the marginal field of view. When the image exceeds the upper limit of the limited range, the field angle of the optical lens group is too large, which causes too large distortion of the external field, distortion phenomenon at the periphery of the image and reduced imaging performance.
The optical lens group further satisfies the following conditional expression: 0.2mm-1<FNO/TTL<0.4mm-1Wherein, TTL is a distance from the object-side surface of the first lens element 110 to the image plane on the optical axis, and FNO is an f-number of the optical lens assembly. Based on the above embodiment, the distance from the object side surface of the first lens element 110 to the image surface on the optical axis and the f-number of the optical lens assembly are reasonably limited, so that the optical lens assembly can meet the design requirements of large aperture and miniaturization of the lens system, provide sufficient light transmission amount for shooting, highlight the background to make the picture more vivid, and meet the requirement of high-definition shooting with high image quality under the dim light condition. When exceeding the above-mentioned limitWhen the lower limit of the enclosure is reached, the system structure is compact, the difficulty of the production process is increased, and the assembly yield is reduced. When the light quantity exceeds the upper limit of the limited range, the light quantity of the optical lens group is insufficient while the optical lens group is miniaturized, the shooting effect under the dark light conditions such as a starry sky night scene cannot be realized, and the definition of shot pictures is reduced.
The optical lens group further satisfies the following conditional expression: 0.1< FBL/TTL <0.3, where FBL is a distance from an image side of the eighth lens element 180 to the image plane on the optical axis, and TTL is a distance from an object side of the first lens element 110 to the image plane on the optical axis. Based on the above embodiment, the distance from the image side surface of the eighth lens element 180 to the image surface on the optical axis and the distance from the object side surface of the first lens element 110 to the image surface on the optical axis are reasonably limited, which is beneficial to ensuring that the system has a sufficient focusing range, improving the assembly yield of the lens module, and simultaneously ensuring that the focal depth of the optical lens group is larger, so that more depth information of the object space can be acquired.
The optical lens group further satisfies the following conditional expression: -0.8<f1/f2<0, wherein f1Is the focal length, f, of the first lens 1102Is the focal length of the second lens 120. Based on the above embodiments, the first lens element 110 provides positive refractive power for the optical lens assembly, which is favorable for collecting object space light, and the second lens element 120 provides negative refractive power for the optical lens assembly, which can diffuse light and meet the requirement of image height. The negative and positive combination of the two not only effectively compresses the system volume, realizes the miniaturization design requirement, but also well corrects the aberration and the curvature of field of the whole optical lens group. Therefore, the focal length of the first lens 110 and the focal length of the second lens 120 are reasonably limited, the total length of the system can be reduced by ensuring the provided bending force value, and the miniaturization design requirement is met.
The optical lens group further satisfies the following conditional expression: 0.2< DL/TTL <1, where DL is the diameter of the stop, and TTL is the distance on the optical axis from the object-side surface of the first lens element 110 to the image plane. Based on the above embodiment, the diameter of the diaphragm and the distance from the object side surface of the first lens element 110 to the image plane on the optical axis are reasonably limited, which is beneficial to ensuring the miniaturization design of the lens, providing the light flux required by the lens for shooting, and realizing the high-quality and high-definition shooting effect. When the light quantity exceeds the lower limit of the limited range, the aperture of the diaphragm light transmission is too small, the light transmission quantity of a system cannot be met, and the high-definition shooting requirement of a dark light scene cannot be met. When the upper limit of the limited range is exceeded, the light-transmitting aperture is too large, so that marginal light rays enter an imaging system, and the imaging quality is reduced.
The optical lens group further satisfies the following conditional expression: 0.4<SDs1/EFL<0.7 of, wherein SDs1The effective diameter of the object-side surface of the first lens element 110, and the EFL is the focal length of the optical lens assembly. Based on the above embodiment, since the diameter of the first lens element 110 determines the size of the light entering into the object space, the effective diameter of the object-side surface of the first lens element 110 and the focal length of the optical lens assembly are reasonably limited, so that the lens can be ensured to satisfy both the performances of long focus and large aperture, and provide sufficient light entering amount for long-distance image pickup, ensure brighter image during image pickup, large blurring of the subject background, achieve the effect of highlighting the subject image pickup, and ensure that high-quality night scenes, starry sky scenes and other scenes with small brightness in the object space can be picked up under the condition of general or worse light brightness. When the lower limit of the above-mentioned limited range is exceeded, sufficient brightness cannot be provided for photographing, and the photographing effect under a dark light condition cannot be ensured. When the upper limit of the above-defined range is exceeded, the telephoto performance of the telephoto lens cannot be achieved.
The optical lens group further satisfies the following conditional expression: 0.8< EFL/TTL <1.2, where EFL is a focal length of the optical lens assembly, and TTL is a distance on the optical axis from the object-side surface of the first lens element 110 to the image plane. Based on above-mentioned embodiment, through the focal length to optical lens group, the object side of first lens 110 to the reasonable of image plane distance on the optical axis injects, be favorable to realizing that optical lens structure is miniaturized and compromise the long focal performance, can guarantee simultaneously that light better assembles on imaging surface, improves imaging quality, guarantees the authenticity of image. When the optical length of the optical lens group exceeds the lower limit of the above-mentioned limited range, the optical length of the optical lens group is too short, which increases the sensitivity of the system and is not favorable for the convergence of light on the image plane. When the optical length of the optical lens group exceeds the upper limit of the limited range, the angle of the chief ray of the light entering the imaging surface is too large, so that the marginal light of the imaging surface of the system cannot be imaged on the photosensitive surface, and finally imaging information is incomplete.
The optical lens group further satisfies the following conditional expression: 0.4<f4/Rs7<1.6 wherein f4Is the focal length, R, of the fourth lens 140s7Is the radius of curvature of the object-side surface of the fourth lens 140 at the optical axis. Based on the above embodiment, by reasonably defining the focal length of the fourth lens element 140 and the curvature radius of the object-side surface of the fourth lens element 140 at the optical axis, the shape and focal power of the fourth lens element 140 can be effectively controlled, so that the focal power of the fourth lens element 140 is matched with the focal power of the optical imaging system, thereby facilitating the mutual balance between the focal powers of the respective lens elements. When the lower limit of the above-mentioned range is exceeded, the shape of the fourth lens 140 is not smooth enough, which affects the sensitivity of the whole system and reduces the yield of the production process. When the upper limit of the above-defined range is exceeded, the focal length of the fourth lens 140 becomes too large, which is disadvantageous for the balance of the respective lenses.
The optical lens group further satisfies the following conditional expression: -0.4mm-1<(Rs9+Rs10)/(Rs9*Rs10)<-0.1mm-1Wherein R iss9Is the radius of curvature, R, of the object-side surface of the fifth lens element 150 at the optical axiss10Is the radius of curvature of the image-side surface of the fifth lens element 150 at the optical axis. Based on the above embodiment, the curvature radius of the object-side surface of the fifth lens element 150 at the optical axis and the curvature radius of the image-side surface of the fifth lens element 150 at the optical axis are reasonably defined, which is beneficial to balance the optical path difference between the marginal ray and the paraxial ray of the optical lens assembly and to correct the field curvature and astigmatism, and simultaneously reduces the system sensitivity and improves the assembly stability. When the lower limit of the above-mentioned limited range is exceeded, the curvature of field of the optical lens assembly is too large. When the upper limit of the above-defined range is exceeded, the sensitivity of the system is increased, and the production yield is lowered.
In order to reduce stray light and improve imaging effect, the optical lens group can further comprise a diaphragm. The diaphragm may be an aperture diaphragm and/or a field diaphragm. The diaphragm may be located between the object plane and the image plane. For example, the diaphragms may be located: between the object-side surface of the first lens element 110 and the object plane, between the image-side surface of the first lens element 110 and the object-side surface of the second lens element 120, between the image-side surface of the second lens element 120 and the object-side surface of the third lens element 130, between the image-side surface of the third lens element 130 and the object-side surface of the fourth lens element 140, between the image-side surface of the fourth lens element 140 and the object-side surface of the fifth lens element 150, between the image-side surface of the fifth lens element 150 and the object-side surface of the sixth lens element 160, between the image-side surface of the sixth lens element 160 and the object-side surface of the seventh lens element 170, between the image-side surface of the seventh lens element 170 and the object-side surface of the eighth lens element 180, or between the image-side surface of the eighth lens element 180 and the image plane. In order to reduce the processing cost, an aperture stop may be provided on any one of the object-side surface of the first lens 110, the object-side surface of the second lens 120, the object-side surface of the third lens 130, the object-side surface of the fourth lens 140, the object-side surface of the fifth lens 150, the object-side surface of the sixth lens 160, the object-side surface of the seventh lens 170, the object-side surface of the eighth lens 180, the image-side surface of the first lens 110, the image-side surface of the second lens 120, the image-side surface of the third lens 130, the image-side surface of the fourth lens 140, the image-side surface of the fifth lens 150, the image-side surface of the sixth lens 160, the image-side surface of the seventh lens 170, and the image-side surface of the eighth lens 180. Preferably, a stop may be provided on the object side of the third lens 130.
To achieve filtering of the non-operating wavelength bands, the optical lens assembly may further include a filter element 190. Preferably, the filter element 190 may be located between an image side surface and an image surface of the eighth lens 180.
In a second aspect, an embodiment of the present application provides a camera module. The camera module comprises a lens cone, any optical lens group and a photosensitive element. The optical lens group is arranged in the lens cone, and the photosensitive element is arranged at the image side of the optical lens group.
Based on the camera module in this application embodiment, through the bending force and the rational design of face type to first lens 110 to eighth lens 180, not only can satisfy miniaturized structural design, can also make the picture of shooing more vivid and have high resolution.
In a third aspect, an embodiment of the present application provides an electronic device. The electronic device comprises a shell and the camera module. The camera module is arranged in the shell. The electronic device may be any apparatus having a function of acquiring an image. For example, the electronic device may be a smart phone, a wearable device, a computer device, a television, a vehicle, a camera, a monitoring device, or the like, and the camera module is configured to cooperate with the electronic device to capture and reproduce an image of the target object.
Based on the electronic device in the embodiment of the present application, through the reasonable design of the bending force and the surface shape of the first lens 110 to the eighth lens 180, not only the requirement of the miniaturized structural design can be satisfied, but also the photographed picture can be more vivid and have high resolution.
Several embodiments of the optical imaging lens assembly will be described in detail with reference to specific parameters.
Detailed description of the preferred embodiment
Referring to fig. 1, the optical lens group includes a first lens 110, a second lens 120, a third lens 130 (an object side surface of the third lens 130 is provided with a diaphragm), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is convex near the optical axis. The object-side surface of the seventh lens element 170 is convex near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is convex at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is concave at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is concave at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 1, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
TABLE 1
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, and 20 th orders, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 2:
TABLE 2
In fig. 2, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 2 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.080 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 2 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 2 that astigmatism is within 0.02 mm, which is better compensated. C in fig. 2 is a distortion curve of the embodiment of the present application, and it can be seen from c in fig. 2 that distortion is also well corrected.
Detailed description of the invention
Referring to fig. 3, the optical lens group includes a first lens 110, a second lens 120, a third lens 130 (an object side surface of the third lens 130 is provided with a diaphragm), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is convex near the optical axis. The object-side surface of the seventh lens element 170 is convex near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is convex at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is convex at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is concave at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 3, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
TABLE 3
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 4:
TABLE 4
| Number of noodles | k | A4 | A6 | A8 | A10 |
| 1 | -9.803E-02 | -1.263E-03 | 1.102E-03 | -1.494E-03 | 7.273E-04 |
| 2 | 5.825E+01 | 1.029E-02 | 2.062E-04 | -5.046E-03 | 3.941E-03 |
| 3 | 5.538E+01 | 1.180E-02 | 2.574E-03 | -1.222E-02 | 1.565E-02 |
| 4 | 2.676E+00 | 2.625E-03 | 2.936E-02 | -7.924E-02 | 9.794E-02 |
| 5 | 1.372E+01 | -4.718E-04 | 1.903E-02 | -6.567E-02 | 8.439E-02 |
| 6 | 7.743E+01 | 2.014E-02 | -7.044E-02 | 1.591E-01 | -2.392E-01 |
| 7 | -2.365E+00 | 2.701E-02 | -6.297E-02 | 2.279E-02 | 3.238E-02 |
| 8 | 8.193E+01 | 1.616E-02 | -6.243E-02 | 5.173E-02 | -4.487E-02 |
| 9 | 1.237E+01 | -9.124E-02 | 3.537E-02 | -6.562E-02 | 1.180E-01 |
| 10 | 1.002E+01 | -6.943E-02 | 2.317E-02 | 1.576E-02 | -1.053E-02 |
| 11 | 1.625E+01 | 2.832E-02 | -1.435E-01 | 1.370E-01 | -6.483E-02 |
| 12 | 4.618E+01 | 3.778E-03 | -1.110E-01 | 1.051E-01 | -5.164E-02 |
| 13 | 9.900E+01 | -7.834E-02 | 6.723E-02 | -5.910E-02 | 2.764E-02 |
| 14 | 1.930E+01 | -1.008E-01 | 9.224E-02 | -7.282E-02 | 3.228E-02 |
| 15 | -1.625E+01 | 1.657E-02 | -7.342E-02 | 5.472E-02 | -2.234E-02 |
| 16 | -1.324E+01 | 2.932E-02 | -7.254E-02 | 5.223E-02 | -2.158E-02 |
| Number of noodles | A12 | A14 | A16 | A18 | A20 |
| 1 | -2.526E-04 | 2.313E-05 | -2.926E-06 | 0.000E+00 | 0.000E+00 |
| 2 | -1.400E-03 | 2.351E-04 | -1.624E-05 | 0.000E+00 | 0.000E+00 |
| 3 | -7.794E-03 | 1.903E-03 | -1.904E-04 | 0.000E+00 | 0.000E+00 |
| 4 | -5.603E-02 | 1.620E-02 | -2.052E-03 | 0.000E+00 | 0.000E+00 |
| 5 | -4.708E-02 | 1.131E-02 | -6.709E-04 | 0.000E+00 | 0.000E+00 |
| 6 | 2.114E-01 | -1.011E-01 | 2.034E-02 | 0.000E+00 | 0.000E+00 |
| 7 | -6.989E-02 | 4.774E-02 | -1.123E-02 | 0.000E+00 | 0.000E+00 |
| 8 | 2.023E-02 | -5.842E-03 | 8.785E-04 | 0.000E+00 | 0.000E+00 |
| 9 | -9.486E-02 | 2.805E-02 | -1.423E-03 | 0.000E+00 | 0.000E+00 |
| 10 | 1.032E-02 | -7.029E-03 | 1.813E-03 | 0.000E+00 | 0.000E+00 |
| 11 | 1.518E-02 | -1.504E-03 | 3.595E-05 | 0.000E+00 | 0.000E+00 |
| 12 | 1.438E-02 | -2.123E-03 | 1.287E-04 | 0.000E+00 | 0.000E+00 |
| 13 | -6.873E-03 | 8.710E-04 | -4.376E-05 | 0.000E+00 | 0.000E+00 |
| 14 | -8.184E-03 | 1.099E-03 | -5.996E-05 | 0.000E+00 | 0.000E+00 |
| 15 | 5.712E-03 | -9.782E-04 | 1.144E-04 | -8.386E-06 | 2.839E-07 |
| 16 | 5.657E-03 | -9.623E-04 | 1.030E-04 | -6.275E-06 | 1.651E-07 |
In fig. 4, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 4 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.10 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 4 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 4 that astigmatism is within 0.050 mm, which is better compensated. C in fig. 4 is a distortion curve of the embodiment of the present application, and it can be seen from c in fig. 4 that distortion is also well corrected.
Detailed description of the preferred embodiment
Referring to fig. 5, a structural schematic diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is convex near the optical axis. The object-side surface of the seventh lens element 170 is convex near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is convex at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is convex at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 5, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
TABLE 5
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 6:
TABLE 6
| Number of noodles | k | A4 | A6 | A8 | A10 |
| 1 | -1.066E-01 | -1.685E-03 | 1.777E-03 | -2.239E-03 | 1.331E-03 |
| 2 | 4.555E+01 | 2.246E-03 | 1.368E-02 | -1.601E-02 | 8.463E-03 |
| 3 | 5.024E+00 | 1.092E-02 | -8.023E-03 | 1.205E-02 | -8.491E-03 |
| 4 | 2.686E+00 | 1.416E-02 | -2.377E-02 | 1.533E-03 | 3.653E-02 |
| 5 | 1.374E+01 | 1.319E-02 | -4.250E-02 | 2.879E-02 | 2.166E-02 |
| 6 | 7.482E+01 | 2.230E-02 | -9.363E-02 | 1.775E-01 | -1.787E-01 |
| 7 | -1.369E+00 | 2.765E-02 | -1.026E-01 | 1.773E-01 | -1.866E-01 |
| 8 | -9.900E+01 | 2.724E-02 | -1.337E-01 | 2.542E-01 | -2.927E-01 |
| 9 | 1.204E+01 | -4.841E-02 | -9.568E-02 | 1.978E-01 | -1.733E-01 |
| 10 | 2.045E+01 | -4.371E-02 | -4.932E-02 | 1.193E-01 | -1.016E-01 |
| 11 | 1.742E+01 | 3.407E-02 | -1.375E-01 | 1.279E-01 | -7.764E-02 |
| 12 | 9.900E+01 | -1.450E-02 | -5.899E-02 | 6.818E-02 | -4.432E-02 |
| 13 | 9.900E+01 | -6.539E-02 | 2.785E-02 | -5.312E-03 | -4.254E-03 |
| 14 | 0.000E+00 | 0.000E+00 | 0.000E+00 | 0.000E+00 | 0.000E+00 |
| 15 | -2.282E+01 | 4.883E-02 | -1.124E-01 | 8.192E-02 | -3.525E-02 |
| 16 | -2.234E+01 | 5.334E-02 | -1.032E-01 | 7.643E-02 | -3.424E-02 |
| Number of noodles | A12 | A14 | A16 | A18 | A20 |
| 1 | -4.894E-04 | 8.188E-05 | -7.030E-06 | 0.000E+00 | 0.000E+00 |
| 2 | -2.319E-03 | 3.158E-04 | -1.729E-05 | 0.000E+00 | 0.000E+00 |
| 3 | 3.856E-03 | -8.593E-04 | 6.856E-05 | 0.000E+00 | 0.000E+00 |
| 4 | -3.323E-02 | 1.227E-02 | -1.739E-03 | 0.000E+00 | 0.000E+00 |
| 5 | -3.216E-02 | 1.275E-02 | -1.585E-03 | 0.000E+00 | 0.000E+00 |
| 6 | 1.022E-01 | -3.410E-02 | 5.489E-03 | 0.000E+00 | 0.000E+00 |
| 7 | 9.206E-02 | -1.723E-02 | -1.185E-06 | 0.000E+00 | 0.000E+00 |
| 8 | 1.713E-01 | -5.043E-02 | 6.004E-03 | 0.000E+00 | 0.000E+00 |
| 9 | 7.638E-02 | -1.903E-02 | 2.533E-03 | 0.000E+00 | 0.000E+00 |
| 10 | 5.364E-02 | -1.667E-02 | 2.350E-03 | 0.000E+00 | 0.000E+00 |
| 11 | 3.101E-02 | -7.251E-03 | 7.528E-04 | 0.000E+00 | 0.000E+00 |
| 12 | 1.613E-02 | -2.971E-03 | 2.151E-04 | 0.000E+00 | 0.000E+00 |
| 13 | 2.439E-03 | -4.616E-04 | 3.175E-05 | 0.000E+00 | 0.000E+00 |
| 14 | 0.000E+00 | 0.000E+00 | 0.000E+00 | 0.000E+00 | 0.000E+00 |
| 15 | 1.003E-02 | -1.933E-03 | 2.392E-04 | -1.650E-05 | 4.516E-07 |
| 16 | 9.913E-03 | -1.854E-03 | 2.143E-04 | -1.380E-05 | 3.748E-07 |
In fig. 6, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 6 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.080 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 6 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 6 that astigmatism is within 0.025 mm, which is well compensated. C in fig. 6 is a distortion curve of the embodiment of the present application, and it can be seen from c in fig. 6 that distortion is also well corrected.
Detailed description of the invention
Referring to fig. 7, a structural schematic diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is convex near the optical axis. The object-side surface of the seventh lens element 170 is concave near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is concave at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is concave at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is concave at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 7, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
TABLE 7
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 8:
TABLE 8
| Number of noodles | k | A4 | A6 | A8 | A10 |
| 1 | -7.364E-02 | -2.238E-03 | -3.155E-04 | 3.808E-04 | -6.998E-04 |
| 2 | 4.416E+01 | 1.325E-02 | 1.509E-03 | -4.848E-03 | 2.217E-03 |
| 3 | 3.082E+01 | 2.931E-02 | -2.758E-02 | 3.103E-02 | -2.205E-02 |
| 4 | 3.786E+00 | 2.608E-02 | -4.292E-02 | 3.063E-02 | 2.544E-03 |
| 5 | 1.363E+01 | 1.423E-02 | -3.989E-02 | 3.369E-02 | -2.570E-03 |
| 6 | 6.258E+01 | 2.473E-02 | -7.186E-02 | 1.299E-01 | -1.482E-01 |
| 7 | -3.369E+00 | 3.719E-02 | -9.432E-02 | 1.059E-01 | -1.070E-01 |
| 8 | 3.887E+00 | 2.785E-02 | -9.862E-02 | 1.148E-01 | -1.247E-01 |
| 9 | 1.237E+01 | -5.092E-02 | -2.901E-02 | 4.666E-02 | -2.553E-02 |
| 10 | 2.066E+01 | -4.813E-02 | -2.082E-02 | 7.427E-02 | -7.202E-02 |
| 11 | 1.563E+01 | -1.657E-02 | -2.101E-01 | 2.264E-01 | -1.213E-01 |
| 12 | 3.405E+01 | 3.175E-03 | -2.354E-01 | 3.069E-01 | -2.031E-01 |
| 13 | -9.900E+01 | -3.855E-02 | -2.950E-02 | 7.242E-02 | -5.900E-02 |
| 14 | 1.478E+01 | -2.316E-02 | -3.316E-03 | -2.367E-02 | 2.184E-02 |
| 15 | -3.590E+01 | 5.150E-02 | -9.976E-02 | 5.057E-02 | -1.328E-02 |
| 16 | -2.456E+01 | 6.818E-03 | -4.589E-02 | 3.579E-02 | -1.752E-02 |
| Number of noodles | A12 | A14 | A16 | A18 | A20 |
| 1 | 3.513E-04 | -9.214E-05 | 6.982E-06 | 0.000E+00 | 0.000E+00 |
| 2 | -4.629E-04 | 3.896E-05 | -5.370E-07 | 0.000E+00 | 0.000E+00 |
| 3 | 9.439E-03 | -2.126E-03 | 1.951E-04 | 0.000E+00 | 0.000E+00 |
| 4 | -1.361E-02 | 7.335E-03 | -1.320E-03 | 0.000E+00 | 0.000E+00 |
| 5 | -8.558E-03 | 4.347E-03 | -5.844E-04 | 0.000E+00 | 0.000E+00 |
| 6 | 1.004E-01 | -3.866E-02 | 6.574E-03 | 0.000E+00 | 0.000E+00 |
| 7 | 5.582E-02 | -1.248E-02 | 7.299E-04 | 0.000E+00 | 0.000E+00 |
| 8 | 6.869E-02 | -1.714E-02 | 1.469E-03 | 0.000E+00 | 0.000E+00 |
| 9 | -4.597E-03 | 6.589E-03 | -1.193E-03 | 0.000E+00 | 0.000E+00 |
| 10 | 4.850E-02 | -1.873E-02 | 3.076E-03 | 0.000E+00 | 0.000E+00 |
| 11 | 3.803E-02 | -6.650E-03 | 5.332E-04 | 0.000E+00 | 0.000E+00 |
| 12 | 7.391E-02 | -1.377E-02 | 1.018E-03 | 0.000E+00 | 0.000E+00 |
| 13 | 2.196E-02 | -3.820E-03 | 2.532E-04 | 0.000E+00 | 0.000E+00 |
| 14 | -8.309E-03 | 1.447E-03 | -9.405E-05 | 0.000E+00 | 0.000E+00 |
| 15 | 3.052E-03 | -1.001E-03 | 2.516E-04 | -3.194E-05 | 1.556E-06 |
| 16 | 6.009E-03 | -1.388E-03 | 1.994E-04 | -1.588E-05 | 5.332E-07 |
In fig. 8, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 8 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.080 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 8 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 8 that astigmatism is within 0.02 mm, which is better compensated. C in fig. 8 is a distortion curve of the embodiment of the present application, and it can be seen from c in fig. 8 that distortion is also well corrected.
Detailed description of the preferred embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is convex near the optical axis, and the image-side surface of the sixth lens element 160 is concave near the optical axis. The object-side surface of the seventh lens element 170 is convex near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is convex at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is convex at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 9, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
TABLE 9
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 10:
watch 10
In fig. 10, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 10 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.080 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 10 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 10 that astigmatism is within 0.08 mm, which is better compensated. Fig. 10 c is a distortion curve of the embodiment of the present application, and it can be seen from fig. 10 c that distortion is also well corrected.
Detailed description of the preferred embodiment
Referring to fig. 11, a structural schematic diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is concave near the optical axis. The object-side surface of the seventh lens element 170 is concave near the optical axis, and the image-side surface of the seventh lens element 170 is convex near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is concave at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is convex at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is concave at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, referring to light with a wavelength of 587.6nm, relevant parameters of the optical lens assembly are shown in table 11, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is an axial distance from an object-side surface of the first lens element 110 to an image plane.
TABLE 11
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 12:
TABLE 12
In fig. 12, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 12 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.080 mm, which indicates that the imaging quality of the embodiment of the present application is better.
Fig. 12 b is a graph of astigmatism of the embodiment of the present application, and it can be seen from fig. 12 b that astigmatism is within 0.08 mm, and better compensation is obtained. Fig. 12 c is a distortion curve chart of the embodiment of the present application, and it can be seen from fig. 12 c that distortion is also well corrected.
Detailed description of the preferred embodiment
Referring to fig. 13, a structural schematic diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is convex near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is convex near the optical axis. The object-side surface of the seventh lens element 170 is convex near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is convex at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is convex at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is convex at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 13, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
Watch 13
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 14:
TABLE 14
Fig. 14 a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 14 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.10 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 14 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 14 that astigmatism is within 0.05 mm, which is better compensated. Fig. 14 c is a distortion curve of the embodiment of the present application, and it can be seen from fig. 14 c that distortion is also well corrected.
Detailed description of the preferred embodiment
Referring to fig. 15, a schematic structural diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is concave near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is convex near the optical axis. The object-side surface of the seventh lens element 170 is concave near the optical axis, and the image-side surface of the seventh lens element 170 is convex near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is concave at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is concave at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is concave at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is concave at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is convex at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 15, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
Watch 15
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 16:
TABLE 16
In fig. 16, a is a graph of longitudinal spherical aberration of light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 16 that the longitudinal spherical aberrations corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.080 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 16 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 16 that astigmatism is within 0.02 mm, which is better compensated. C in fig. 16 is a distortion curve chart of the embodiment of the present application, and it can be seen from c in fig. 16 that the distortion is well corrected.
Detailed description of the preferred embodiment
Referring to fig. 17, a schematic structural diagram of an optical lens group according to an embodiment of the present application includes a first lens 110, a second lens 120, a third lens 130 (an object-side surface of the third lens 130 is provided with a stop), a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a filter, which are sequentially disposed along an optical axis from an object plane to an image plane. The object-side surface of the first lens element 110 is convex near the optical axis, and the image-side surface of the first lens element 110 is convex near the optical axis. The object-side surface of the second lens element 120 is convex near the optical axis, and the image-side surface of the second lens element 120 is concave near the optical axis. The object-side surface of the third lens element 130 is convex near the optical axis, and the image-side surface of the third lens element 130 is concave near the optical axis. The object-side surface of the fourth lens element 140 is concave near the optical axis, and the image-side surface of the fourth lens element 140 is concave near the optical axis. The object-side surface of the fifth lens element 150 is concave near the optical axis, and the image-side surface of the fifth lens element 150 is convex near the optical axis. The object-side surface of the sixth lens element 160 is concave near the optical axis, and the image-side surface of the sixth lens element 160 is concave near the optical axis. The object-side surface of the seventh lens element 170 is convex near the optical axis, and the image-side surface of the seventh lens element 170 is concave near the optical axis. The object-side surface of the eighth lens element 180 is convex near the optical axis, and the image-side surface of the eighth lens element 180 is concave near the optical axis. The object-side surface of the first lens element 110 is concave at the circumference, and the image-side surface of the first lens element 110 is convex at the circumference. The object-side surface of the second lens element 120 is convex at the circumference, and the image-side surface of the second lens element 120 is concave at the circumference. The object-side surface of the third lens element 130 is convex at the circumference, and the image-side surface of the third lens element 130 is concave at the circumference. The object-side surface of the fourth lens element 140 is concave at the circumference, and the image-side surface of the fourth lens element 140 is convex at the circumference. The object-side surface of the fifth lens element 150 is convex at the circumference, and the image-side surface of the fifth lens element 150 is concave at the circumference. The object-side surface of the sixth lens element 160 is concave at the circumference, and the image-side surface of the sixth lens element 160 is convex at the circumference. The object-side surface of the seventh lens element 170 is convex at the circumference, and the image-side surface of the seventh lens element 170 is convex at the circumference. The object-side surface of the eighth lens element 180 is concave at the circumference, and the image-side surface of the eighth lens element 180 is concave at the circumference.
In the embodiment of the present application, light with a wavelength of 587.6nm is taken as a reference, relevant parameters of the optical lens assembly are shown in table 17, EFL is a focal length of the optical lens assembly, FNO is an f-number, FOV is a maximum field angle of the optical lens assembly, and TTL is a distance from an object-side surface of the first lens element 110 to an image plane on an optical axis.
TABLE 17
The surfaces of the lenses of the optical lens group may be aspherical surfaces for which the aspherical equation for the aspherical surface is:
where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and a4, a6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order, 16 th order, 18 th order, and 20 th order, respectively. In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 18:
watch 18
In fig. 18, a is a graph of the longitudinal spherical aberration of the light with wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm in the embodiment of the present application, and it can be seen from a in fig. 18 that the longitudinal spherical aberration corresponding to the wavelengths of 650.0000nm, 610.000nm, 587.6000nm, 510.0000nm and 470.0000nm are all within 0.05 mm, which indicates that the imaging quality of the embodiment of the present application is better.
B in fig. 18 is a graph of astigmatism of the embodiment of the present application, and it can be seen from b in fig. 18 that astigmatism is within 0.01 mm, and good compensation is obtained. C in fig. 18 is a distortion curve chart of the embodiment of the present application, and it can be seen from c in fig. 18 that distortion is also well corrected.
The data for the nine sets of examples above are as follows in table 19:
watch 19
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (15)
1. An optical lens assembly, comprising eight lenses having refractive power, the eight lenses sequentially comprising along an optical axis from an object plane to an image plane:
a first lens element with positive refractive power, wherein an object-side surface of the first lens element is convex near the optical axis, and an image-side surface of the first lens element is convex near the optical axis;
a second lens element having a negative bending force, an image side surface of the second lens element being concave in the vicinity of the optical axis;
a third lens element with positive refractive power, wherein an object-side surface of the third lens element is convex near the optical axis, and an image-side surface of the third lens element is concave near the optical axis;
a fourth lens element having a negative bending force, an object-side surface of the fourth lens element being concave in the vicinity of the optical axis;
a fifth lens element with a refractive power, an object-side surface of the fifth lens element being concave near the optical axis, and an image-side surface of the fifth lens element being convex near the optical axis;
a sixth lens having a negative bending force;
a seventh lens having a negative refracting power;
an eighth lens element with a refractive power, an object-side surface of the eighth lens element being convex near the optical axis, and an image-side surface of the eighth lens element being concave near the optical axis;
the optical lens group further satisfies the following conditional expression:
0.4<SDs1/EFL<0.7；
wherein SDs1 is an effective diameter of an object side surface of the first lens element, and EFL is a focal length of the optical lens assembly.
2. The optical lens assembly of claim 1, further satisfying the following conditional expression:
0.2mm-1<FNO/EFL<0.4mm-1；
and the FNO is the f-number of the optical lens group, and the EFL is the focal length of the optical lens group.
3. The optical lens assembly of claim 1, further satisfying the following conditional expression:
1.5<FNO<1.95；
and the FNO is the f-number of the optical lens group.
4. The optical lens assembly according to claim 1, wherein said first lens and said third lens have the same abbe number, and said second lens and said fourth lens have the same abbe number, and said optical lens assembly further satisfies the following conditional expressions:
Vd1>50；
Vd2<50; and is
0.1<Vd1/Vd2<0.4；
Wherein, Vd1Is Abbe number, Vd, of the first lens2Is the abbe number of the second lens.
5. The optical lens group of claim 1, further comprising a stop, wherein the optical lens group further satisfies the following conditional expressions:
0.2<DL/Imgh<0.5；
wherein DL is the diameter of the diaphragm, and Imgh is the image height corresponding to the maximum field angle of the optical lens group.
6. The optical lens assembly of claim 1, further satisfying the following conditional expression:
0.3<sin(FOV)/FNO<0.6；
wherein FOV is the maximum field angle of the optical lens group, sin (FOV) is the sine value of the maximum field angle of the optical lens group, and FNO is the f-number of the optical lens group.
7. The optical lens assembly of claim 1, further satisfying the following conditional expression:
0.2mm-1<FNO/TTL<0.4mm-1；
wherein, TTL is a distance from the object side surface of the first lens element to the image plane on the optical axis, and FNO is an f-number of the optical lens group.
8. The optical lens assembly of claim 1, further satisfying the following conditional expression:
0.1<FBL/TTL<0.3；
the FBL is the shortest distance from the image side surface of the eighth lens to the image plane, and the TTL is the distance from the object side surface of the first lens to the image plane on the optical axis.
9. The optical lens assembly of claim 1, further satisfying the following conditional expression:
-0.6<f1/f2<0；
wherein f is1Is the focal length of the first lens, f2Is the focal length of the second lens.
10. The optical lens group of claim 1, further comprising a stop, wherein the optical lens group further satisfies the following conditional expressions:
0.2<DL/TTL<1；
and DL is the diameter of the diaphragm, and TTL is the distance from the object side surface of the first lens to the image plane on the optical axis.
11. The optical lens assembly of claim 1, further satisfying the following conditional expression:
0.8<EFL/TTL<1.2；
wherein, EFL is the focal length of the optical lens group, and TTL is the distance between the object side surface of the first lens element and the image surface on the optical axis.
12. The optical lens assembly of claim 1, further satisfying the following conditional expression:
0.4<f4/Rs7<1.6；
wherein f is4Is the focal length of the fourth lens, Rs7Is a radius of curvature of an object-side surface of the fourth lens at the optical axis.
13. The optical lens assembly of claim 1, further satisfying the following conditional expression:
-0.4mm-1<(Rs9+Rs10)/(Rs9*Rs10)<-0.1mm-1；
wherein R iss9Is a radius of curvature, R, of an object-side surface of the fifth lens at the optical axiss10The curvature radius of the image side surface of the fifth lens at the optical axis is shown.
14. The utility model provides a camera module which characterized in that includes:
a lens barrel;
the optical lens group according to any one of claims 1 to 13, disposed within the barrel; and
the photosensitive element is arranged on the image side of the optical lens group.
15. An electronic device, comprising:
a housing; and
the camera module of claim 14, said camera module disposed within said housing.
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