CN113433656B - Imaging system, lens module and electronic equipment - Google Patents

Imaging system, lens module and electronic equipment Download PDF

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Publication number
CN113433656B
CN113433656B CN202110655712.7A CN202110655712A CN113433656B CN 113433656 B CN113433656 B CN 113433656B CN 202110655712 A CN202110655712 A CN 202110655712A CN 113433656 B CN113433656 B CN 113433656B
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imaging system
lens
lens element
image
optical axis
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CN113433656A (en
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曾晗
李明
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Jiangxi Oufei Optics Co ltd
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Jiangxi Oufei Optics Co ltd
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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
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application discloses an imaging system, a lens module and electronic equipment. The imaging system satisfies the following conditional expression: 1.2 is less than or equal to ImgH and less than or equal to 2/TTL is less than or equal to 1.5, wherein ImgH is half of an image height corresponding to a maximum field angle of an imaging system, and TTL is a distance from an object side surface of a first lens to an image surface of the imaging system on an optical axis. On the premise of ensuring miniaturization and thinning of the imaging system, the imaging system has excellent imaging quality.

Description

Imaging system, lens module and electronic equipment
Technical Field
The present application relates to the field of optical imaging technologies, and in particular, to an imaging system, a lens module, and an electronic device.
Background
With the rapid development of portable electronic products such as smartphones in recent years, portable electronic product manufacturers such as smartphones have made more new demands for portable electronic product lenses such as smartphones. Imaging lenses for portable electronic products such as smartphones tend to be increasingly characterized by high imaging quality, which presents a greater challenge for optical system design.
The photosensitive devices of the lenses of the portable electronic products such as the general smart phones are usually a photosensitive coupling device or a complementary metal oxide semiconductor device. Due to the continuous development of semiconductor manufacturing technology, the corresponding imaging lens also needs to meet the requirement of high imaging quality. Therefore, an imaging lens with good imaging quality is a problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides an imaging system, a lens module and electronic equipment, which can have good imaging quality on the premise of ensuring the thinning. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an imaging system, including, in order from an object side to an image side along an optical axis:
a first lens element with positive refractive power having a convex object-side surface near the optical axis;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface near the optical axis;
a third lens element with refractive power;
a fourth lens element with refractive power;
A fifth lens element with negative refractive power;
a sixth lens element with positive refractive power;
a seventh lens element with positive refractive power having a convex object-side surface near the optical axis;
an eighth lens element with negative refractive power having a convex object-side surface and a concave image-side surface near the optical axis;
wherein the imaging system satisfies the following conditional expression:
1.2≤ImgH*2/TTL≤1.5；
wherein ImgH is half of the image height corresponding to the maximum field angle of the imaging system, and TTL is the distance from the object side surface of the first lens to the image surface of the imaging system on the optical axis.
According to the imaging system provided by the embodiment of the application, the imaging system has good imaging quality through reasonable design of the refractive powers and the surface shapes of the first lens element to the eighth lens element. The size of the imaging system can be effectively compressed by reasonably limiting the distance between the object side surface of the first lens and the image plane of the imaging system on the optical axis and the half of the image height corresponding to the maximum field angle of the imaging system, so that the ultra-thin characteristic of the imaging system is realized. By designing the first lens with positive refractive power and the second lens with negative refractive power, on-axis spherical aberration of the imaging system is facilitated to be corrected; the third lens and the fourth lens are designed to have refractive power, so that astigmatism of an imaging system can be corrected; the fifth lens is designed to have negative refractive power, so that light diffusion is facilitated, and the field angle of an imaging system is increased; by designing the sixth lens element and the seventh lens element with positive refractive power, it is advantageous to balance aberrations in the negative direction generated by the first lens element to the fifth lens element; by designing the eighth lens element with negative refractive power, the imaging system can easily secure back focus. The object side surface of the first lens and the object side surface of the second lens are designed to be convex, so that the convergence of light rays of the imaging system is facilitated, and the optical performance of the imaging system is improved; by designing the image side surface of the eighth lens at the paraxial region as a concave surface, the emergence angle of light can be restrained, the sensitivity of the imaging system is reduced, and the engineering manufacture of the imaging system is facilitated.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.29≤SD S1 /ImgH≤0.35；
wherein SD is S1 And the ImgH is half of the image height corresponding to the maximum field angle of the imaging system.
Based on the above embodiment, by reasonably defining half of the maximum effective aperture of the object side surface of the first lens and half of the image height corresponding to the maximum field angle of the imaging system, the imaging system has a matched aperture and photosurface size, so that appropriate light flux can be obtained, and the definition of the photographed image is ensured. When SD is S1 When the ImgH is less than 0.29, insufficient light quantity of an imaging system and insufficient relative brightness of light rays can be caused, so that the picture definition is reduced; when SD is S1 when/ImgH > 0.35, the imaging system will have excessive light flux, resulting in overexposure, and further affecting the picture quality.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.8≤(ET 2 +ET 3 )/(CT 2 +CT 3 )≤1.3；
wherein ET is 2 A distance in a direction parallel to the optical axis from a maximum effective radius of an object side surface of the second lens to a maximum effective radius of an image side surface of the second lensIon, ET 3 CT is the distance from the maximum effective radius of the object side surface of the third lens to the maximum effective radius of the image side surface of the third lens along the direction parallel to the optical axis 2 CT for the distance between the second lens and the optical axis 3 Is the distance between the third lens and the optical axis.
Based on the above embodiments, by reasonably defining the distance from the maximum effective radius of the object-side surface of the second lens to the maximum effective radius of the image-side surface of the second lens along the direction parallel to the optical axis, the distance from the maximum effective radius of the object-side surface of the third lens to the maximum effective radius of the image-side surface of the third lens along the direction parallel to the optical axis, the distance from the second lens on the optical axis, and the distance from the third lens on the optical axis, the thicknesses of the second lens and the third lens can be reasonably configured, which is beneficial to realizing the effect of a large field of view. Meanwhile, the deflection angle of the light passing through the second lens and the third lens is smaller, the stray light in the imaging system is reduced, and the imaging quality of the imaging system is improved. And the sensitivity of the second lens and the third lens can be reduced, the injection molding and the assembly of the second lens and the third lens are facilitated, the injection molding yield of the second lens and the third lens is improved, and the production cost of the second lens and the third lens is reduced.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.5≤(Rs 15 -Rs 16 )/(Rs 15 +Rs 16 )≤0.65；
wherein Rs is 15 For the radius of curvature of the object side surface of the eighth lens at the optical axis, rs 16 Is the radius of curvature of the image side surface of the eighth lens at the optical axis.
Based on the above embodiments, by reasonably defining the radius of curvature of the object side surface of the eighth lens element at the optical axis and the radius of curvature of the image side surface of the eighth lens element at the optical axis, it is beneficial to correct the aberration generated by the imaging system under a large aperture, so that the refractive power arrangement perpendicular to the optical axis direction is uniform, the distortion and aberration generated by the first lens element to the seventh lens element are greatly corrected, and meanwhile, excessive bending of the eighth lens element can be avoided, and the forming and manufacturing of the eighth lens element are easier.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.39≤tan(HFOV)/FNO≤0.49；
wherein HFOV is half of the maximum field angle of the imaging system and FNO is the f-number of the imaging system.
Based on the embodiment, through reasonable limitation of half of the maximum field angle of the imaging system and the aperture number of the imaging system, the light flux of the imaging system can be reasonably controlled, the field angle of the imaging system can be increased, and the requirement of wide angle is met. When tan (HFOV)/FNO > 0.49, the aperture number is too small, and the aperture is too large, which is not beneficial to the imaging system to correct aberration; when tan (HFOV)/FNO < 0.39, the angle of view is small, which is disadvantageous for enlarging the image range.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.25mm -1 ≤FNO/TTL≤0.29mm -1 ；
wherein FNO is the f-number of the imaging system, and TTL is the distance from the object side surface of the first lens to the image surface of the imaging system on the optical axis.
Based on the above embodiments, through reasonable limitation of the f-number of the imaging system and the distance between the object side surface of the first lens and the image plane of the imaging system on the optical axis, the imaging system can simultaneously consider the design requirements of large aperture and miniaturization, i.e. can provide enough light flux to meet the requirement of high-definition shooting. When FNO/TTL is more than 0.29mm -1 When the imaging system is miniaturized, the requirement of a large aperture can not be met, insufficient light quantity can be caused, and the definition of a picture can be reduced; when FNO/TTL is less than 0.25mm -1 When the total length of the imaging system is too large, miniaturization of the imaging system is not facilitated.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.6≤|Sag S15 |/CT 8 ≤3；
wherein Sag S15 CT for the sagittal height of the object side surface of the eighth lens at the maximum effective radius 8 Is the distance between the eighth lens and the optical axis.
Based on the above embodiment, by reasonably defining the sagittal height of the object side surface of the eighth lens at the maximum effective radius and the distance of the eighth lens on the optical axis, the shape of the eighth lens can be well controlled, which is beneficial to the manufacture and molding of the eighth lens and reduces the defect of poor molding. Meanwhile, the field curves generated by the first lens to the seventh lens can be trimmed, so that the balance of the field curves of the imaging system is ensured, namely, the field curves of different fields tend to be balanced, the image quality of the picture of the whole imaging system is uniform, and the imaging quality of the imaging system is improved. When |Sag S15 |/CT 8 When the refractive power of the object side surface of the eighth lens element is less than 0.6, the object side surface of the eighth lens element is too smooth, and the off-axis visual field light rays have insufficient deflection capability, which is not beneficial to the correction of distortion and curvature of field aberration. When |Sag S15 |/CT 8 If the ratio is more than 3, the object side surface of the eighth lens element is excessively curved in the circumferential direction, which may result in poor molding and may affect the manufacturing yield.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.08≤FBL/TTL≤0.11；
wherein, FBL is the minimum distance between the image side surface of the eighth lens element and the image plane of the imaging system in the optical axis direction, and TTL is the distance between the object side surface of the first lens element and the image plane of the imaging system in the optical axis direction.
Based on the above embodiment, by reasonably defining the minimum distance from the image side surface of the eighth lens to the image surface of the imaging system in the optical axis direction and the distance from the object side surface of the first lens to the image surface of the imaging system in the optical axis direction, the imaging system is guaranteed to have a sufficient focusing range, the assembly yield is improved, meanwhile, the focal depth of the imaging system is guaranteed to be larger, and more depth information of the object side can be acquired.
In a second aspect, an embodiment of the present application provides a lens module, including:
a lens barrel;
the imaging system as described above, wherein the imaging system is disposed in the lens barrel;
And the photosensitive element is arranged on the image side of the imaging system.
Based on the lens module in the embodiment of the application, the imaging system has good imaging quality through reasonable design of the refractive powers and the surface shapes of the first lens element to the eighth lens element. The size of the imaging system can be effectively compressed by reasonably limiting the distance between the object side surface of the first lens and the image plane of the imaging system on the optical axis and the half of the image height corresponding to the maximum field angle of the imaging system, so that the ultra-thin characteristic of the imaging system is realized. By designing the first lens with positive refractive power and the second lens with negative refractive power, on-axis spherical aberration of the imaging system is facilitated to be corrected; the third lens and the fourth lens are designed to have refractive power, so that astigmatism of an imaging system can be corrected; the fifth lens is designed to have negative refractive power, so that light diffusion is facilitated, and the field angle of an imaging system is increased; by designing the sixth lens element and the seventh lens element with positive refractive power, it is advantageous to balance aberrations in the negative direction generated by the first lens element to the fifth lens element; by designing the eighth lens element with negative refractive power, the imaging system can easily secure back focus. The object side surface of the first lens and the object side surface of the second lens are designed to be convex, so that the convergence of light rays of the imaging system is facilitated, and the optical performance of the imaging system is improved; the image side surface of the eighth lens at the paraxial region is designed to be a concave surface, so that the emergence angle of light can be restrained, the sensitivity of the imaging system is reduced, and the engineering manufacture of the imaging system is facilitated; and the reasonable surface type limit among the lenses is beneficial to improving the assembly yield of the imaging system and reducing the assembly difficulty of the lens module.
In a third aspect, an embodiment of the present application provides an electronic device, including:
a housing; and
The lens module is arranged in the shell.
According to the electronic equipment provided by the embodiment of the application, the imaging system has good imaging quality through reasonable design of the refractive powers and the surface types of the first lens element to the eighth lens element. The size of the imaging system can be effectively compressed by reasonably limiting the distance between the object side surface of the first lens and the image plane of the imaging system on the optical axis and the half of the image height corresponding to the maximum field angle of the imaging system, so that the ultra-thin characteristic of the imaging system is realized. By designing the first lens with positive refractive power and the second lens with negative refractive power, on-axis spherical aberration of the imaging system is facilitated to be corrected; the third lens and the fourth lens are designed to have refractive power, so that astigmatism of an imaging system can be corrected; the fifth lens is designed to have negative refractive power, so that light diffusion is facilitated, and the field angle of an imaging system is increased; by designing the sixth lens element and the seventh lens element with positive refractive power, it is advantageous to balance aberrations in the negative direction generated by the first lens element to the fifth lens element; by designing the eighth lens element with negative refractive power, the imaging system can easily secure back focus. The object side surface of the first lens and the object side surface of the second lens are designed to be convex, so that the convergence of light rays of the imaging system is facilitated, and the optical performance of the imaging system is improved; the image side surface of the eighth lens at the paraxial region is designed to be a concave surface, so that the emergence angle of light can be restrained, the sensitivity of the imaging system is reduced, and the engineering manufacture of the imaging system is facilitated; and the reasonable surface type limit among the lenses is beneficial to improving the assembly yield of an imaging system, reducing the assembly difficulty of a lens module in the electronic equipment, and simultaneously enabling the electronic equipment to be lighter and thinner.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an imaging system according to a first embodiment of the present application;
FIG. 2 is a longitudinal spherical aberration, astigmatic, and distortion plot of an imaging system according to a first embodiment of the present application;
fig. 3 is a schematic structural diagram of an imaging system according to a second embodiment of the present application;
FIG. 4 is a longitudinal spherical aberration, astigmatic, and aberration diagram of an imaging system according to a second embodiment of the present application;
FIG. 5 is a schematic diagram of an imaging system according to a third embodiment of the present application;
FIG. 6 is a longitudinal spherical aberration, astigmatic, and distortion plot of an imaging system according to a third embodiment of the present application;
FIG. 7 is a schematic diagram of an imaging system according to a fourth embodiment of the present application;
FIG. 8 is a longitudinal spherical aberration, astigmatic, and aberration diagram of an imaging system according to a fourth embodiment of the present application
FIG. 9 is a schematic structural diagram of an imaging system according to a fifth embodiment of the present application;
FIG. 10 is a longitudinal spherical aberration, astigmatic, and distortion plot of an imaging system according to a fifth embodiment of the present application;
fig. 11 is a schematic diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
With the rapid development of portable electronic products such as smartphones in recent years, portable electronic product manufacturers such as smartphones have made more new demands for portable electronic product lenses such as smartphones. Imaging lenses for portable electronic products such as smartphones tend to be increasingly characterized by high imaging quality, which presents a greater challenge for optical system design.
The photosensitive devices of the lenses of the portable electronic products such as the general smart phones are usually a photosensitive coupling device or a complementary metal oxide semiconductor device. Due to the continuous development of semiconductor manufacturing technology, the corresponding imaging lens also needs to meet the requirement of high imaging quality. Therefore, an imaging lens with good imaging quality is a problem to be solved at present. Based on the above, the embodiment of the application provides an imaging system, a lens module and electronic equipment, which aim to solve the technical problems.
In a first aspect, an embodiment of the present application provides an imaging system 10. Referring to fig. 1 to 10, the imaging system 10 includes, in order from an object side to an image side along an optical axis, 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.
The first lens element 110 with positive refractive power has an object-side surface S1 being convex at a paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region of the second lens element 120. The third lens element 130 has refractive power. The fourth lens element 140 has refractive power. The fifth lens element 150 with negative refractive power. The sixth lens 160 has positive refractive power. The seventh lens element 170 with positive refractive power has a convex object-side surface S13 at a paraxial region of the seventh lens element 170. The eighth lens element 180 with negative refractive power has a convex object-side surface S15 at a paraxial region and a concave image-side surface S16 at a paraxial region of the eighth lens element 180. The imaging system 10 satisfies the following conditional expression: 1.2.ltoreq.ImgH.ltoreq.2/TTL.ltoreq.1.5, where ImgH is half of the image height corresponding to the maximum field angle of the imaging system 10, and TTL is the distance between the object side surface S1 of the first lens element 110 and the image plane of the imaging system 10 on the optical axis.
The imaging system 10 of the embodiment of the application enables the imaging system 10 to have good imaging quality through reasonable design of the refractive powers and the surface shapes of the first lens element 110 to the eighth lens element 180. By reasonably defining the distance between the object side surface S1 of the first lens element 110 and the image plane S19 of the imaging system 10 on the optical axis and half of the image height corresponding to the maximum field angle of the imaging system 10, the size of the imaging system 10 can be effectively compressed, and thus the ultra-thin characteristic of the imaging system 10 can be realized. By designing the first lens element 110 with positive refractive power and the second lens element 120 with negative refractive power, on-axis spherical aberration of the imaging system 10 is advantageously corrected; the third lens element 130 and the fourth lens element 140 are designed with refractive power to facilitate correction of astigmatism of the imaging system 10; the fifth lens element 150 with negative refractive power is beneficial to light ray diffusion, thereby increasing the angle of view of the imaging system 10; by designing the sixth lens 160 and the seventh lens 170 with positive refractive power, it is advantageous to balance aberrations generated by the first lens 110 to the fifth lens 150 toward the negative direction; by designing the eighth lens element 180 with negative refractive power, the imaging system 10 can easily secure back focus. By designing the object side surface S1 of the first lens element 110 and the object side surface S3 of the second lens element 120 to be convex, the focusing of the light rays of the imaging system 10 is facilitated, and the optical performance of the imaging system 10 is improved; by designing the image-side surface S16 of the eighth lens element 180 at the paraxial region to be concave, the exit angle of the light beam can be suppressed, and the sensitivity of the imaging system 10 can be reduced, which is beneficial for engineering manufacturing of the imaging system 10.
The imaging system 10 also satisfies the following conditional expression: SD of 0.29 or less S1 ImgH is less than or equal to 0.35, wherein SD S1 The object side surface S1 of the first lens element 110 has a maximum effective aperture, and ImgH is half of the image height corresponding to the maximum field angle of the imaging system 10. By reasonably defining half of the maximum effective aperture of the object side surface S1 of the first lens element 110 and half of the image height corresponding to the maximum field angle of the imaging system 10, the imaging system 10 has a matched aperture and photosurface size, so that a proper light flux can be obtained, and the definition of the photographed image is ensured. When SD is S1 When ImgH is less than 0.29, the light quantity of the imaging system 10 is insufficient, the relative brightness of the light is insufficient, and the definition of the picture is reduced; when SD is S1 when/ImgH > 0.35, excessive light passing through the imaging system 10 is caused, resulting in overexposure, which in turn affects the picture quality.
The imaging system 10 also satisfies the following conditional expression: 0.8-0 (ET) 2 +ET 3 )/(CT 2 +CT 3 ) Not more than 1.3, wherein ET 2 A distance in a direction parallel to the optical axis from a maximum effective radius of the object-side surface S3 of the second lens element 120 to a maximum effective radius of the image-side surface S4 of the second lens element 120Ion, ET 3 CT is the upper distance in the direction parallel to the optical axis from the maximum effective radius of the object-side surface S5 of the third lens element 130 to the maximum effective radius of the image-side surface S6 of the third lens element 130 2 CT is the distance between the second lens 120 and the optical axis 3 Is the distance of the third lens 130 on the optical axis. By reasonably defining the distance from the maximum effective radius of the object-side surface of the second lens element 120 to the maximum effective radius of the image-side surface of the second lens element 120 along the direction parallel to the optical axis, the distance from the maximum effective radius of the object-side surface S5 of the third lens element 130 to the maximum effective radius of the image-side surface S6 of the third lens element 130 along the direction parallel to the optical axis, the distance from the second lens element 120 to the optical axis, and the distance from the third lens element 130 to the optical axis, the thicknesses of the second lens element 120 and the third lens element 130 can be reasonably configured, which is beneficial to realizing the effect of a large field of view. Meanwhile, the deflection angle of the light passing through the second lens 120 and the third lens 130 can be smaller, the stray light in the imaging system 10 is reduced, and the imaging quality of the imaging system 10 is improved. The sensitivity of the second lens 120 and the third lens 130 can be reduced, which is beneficial to the injection molding and assembly of the second lens 120 and the third lens 130, improves the injection molding yield of the second lens 120 and the third lens 130, and reduces the production cost of the second lens 120 and the third lens 130.
The imaging system 10 also satisfies the following conditional expression: rs is less than or equal to 0.5 15 -Rs 16 )/(Rs 15 +Rs 16 ) Less than or equal to 0.65, wherein Rs 15 Is the radius of curvature, rs, of the object side surface S15 of the eighth lens 180 at the optical axis 16 Is the radius of curvature of the image side surface S16 of the eighth lens element 180 at the optical axis. By reasonably defining the radius of curvature of the object-side surface S15 of the eighth lens element 180 at the optical axis and the radius of curvature of the image-side surface S16 of the eighth lens element 180 at the optical axis, the aberration generated by the imaging system 10 under a large aperture can be corrected, the refractive power arrangement perpendicular to the optical axis can be made uniform, the distortion and aberration generated by the first lens element 110 to the seventh lens element 170 can be greatly corrected, and meanwhile, excessive bending of the eighth lens element 180 can be avoided, so that the eighth lens element 180 can be molded and manufactured more easily.
The imaging system 10 also satisfies the following conditional expression: tan (HFOV)/FNO is 0.49, where HFOV is half the maximum field angle of the imaging system 10 and FNO is the f-number of the imaging system 10. Through reasonable limitation of half of the maximum field angle of the imaging system 10 and the f-number of the imaging system 10, the light flux of the imaging system 10 can be reasonably controlled, the field angle of the imaging system 10 can be increased, and the requirement of wide angle is met. When tan (HFOV)/FNO > 0.49, the f-number is too small and the f-number is too large, which is detrimental to the correction of aberrations by the imaging system 10; when tan (HFOV)/FNO < 0.39, the angle of view is small, which is disadvantageous for enlarging the image range.
The imaging system 10 also satisfies the following conditional expression: 0.25mm -1 ≤FNO/TTL≤0.29mm -1 Where FNO is the f-number of the imaging system 10, and TTL is the distance between the object side S1 of the first lens element 110 and the image plane of the imaging system 10 on the optical axis. By reasonably defining the f-number of the imaging system 10 and the distance between the object side surface S1 of the first lens element 110 and the image plane of the imaging system 10 on the optical axis, the imaging system 10 can simultaneously satisfy the design requirements of large aperture and miniaturization, i.e. can provide enough light flux to meet the requirement of high-definition shooting. When FNO/TTL is more than 0.29mm -1 When the imaging system 10 is miniaturized, the requirement of a large aperture cannot be met, and insufficient light flux and reduced image definition are caused; when FNO/TTL is less than 0.25mm -1 When the overall length of the imaging system 10 is too large, downsizing of the imaging system 10 is not favored.
The imaging system 10 also satisfies the following conditional expression: sag of 0.6% or less S15 |/CT 8 Not more than 3, wherein Sag S15 CT for the sagittal height of the object-side surface S15 of the eighth lens element 180 at the maximum effective radius 8 Is the distance of the eighth lens 180 on the optical axis. Of these, it should be noted that Sag described above s15 The sagittal height of (a) is the distance between the intersection point of the object side surface S15 of the eighth lens element 180 and the optical axis and the maximum effective aperture of the object side surface S15 (i.e., the maximum effective radius of the object side surface S) in the direction parallel to the optical axis; when the value is positive, in a direction parallel to the optical axis of the imaging system 10, the maximum effective light-transmitting aperture of the face is closer to the image side of the imaging system 10 than the center of the face; when the value is negative, in a direction parallel to the optical axis of the imaging system 10 The maximum effective light transmission aperture of the face is closer to the object side of the imaging system 10 than the center of the face.
By reasonably defining the sagittal height of the object side surface of the eighth lens element 180 at the maximum effective radius and the distance of the eighth lens element 180 on the optical axis, the shape of the eighth lens element 180 can be well controlled, which is beneficial to the manufacture and molding of the eighth lens element 180 and reduces the defect of poor molding. Meanwhile, the field curvature generated by the first lens element 110 to the seventh lens element 170 can be trimmed, so as to ensure the balance of the field curvature of the imaging system 10, i.e. the field curvature of different fields tend to be balanced, so that the image quality of the whole imaging system 10 is uniform, and the imaging quality of the imaging system 10 is improved. When |SagS15|/CT8 is smaller than 0.6, the object-side surface of the eighth lens element 180 has an excessively smooth surface at the circumference, and the off-axis field of view has insufficient light deflection capability, which is not beneficial to the correction of distortion and curvature of field. When |SagS15|/CT8 > 3, excessive bending of the object-side surface S15 of the eighth lens element 180 at the circumference may result in poor molding, affecting the manufacturing yield.
The imaging system 10 also satisfies the following conditional expression: 0.08.ltoreq.FBL/TTL.ltoreq.0.11, where FBL is the minimum distance between the image side S16 of the eighth lens element 180 and the image plane S19 of the imaging system 10 in the optical axis direction, and TTL is the distance between the object side S1 of the first lens element 110 and the image plane S19 of the imaging system 10 in the optical axis direction. Through reasonable definition of the minimum distance from the image side surface S16 of the eighth lens element 180 to the image surface S19 of the imaging system 10 along the optical axis and the distance from the object side surface S1 of the first lens element 110 to the image surface S19 of the imaging system 10 along the optical axis, it is beneficial to ensure that the imaging system 10 has a sufficient focusing range, improve the assembly yield, and ensure that the focal depth of the imaging system 10 is larger, so as to obtain more depth information of the object side.
To reduce stray light to enhance imaging, the imaging system 10 may also include a stop STO. The aperture stop STO may be an aperture stop STO and/or a field stop STO. The stop STO may be located between the object side of the first lens 110 and any two adjacent lenses before the imaging surface S19. For example, the stop STO may be located: the object side of the first lens element 110, the image side S2 of the first lens element 110 and the object side S3 of the second lens element 120, the image side S4 of the second lens element 120 and the object side S5 of the third lens element 130, the image side S6 of the third lens element 130 and the object side S7 of the fourth lens element 140, the image side S8 of the fourth lens element 140 and the object side S9 of the fifth lens element 150, the image side S10 of the fifth lens element 150 and the object side S11 of the sixth lens element 160, the image side S12 of the sixth lens element 160 and the object side S13 of the seventh lens element 170, the image side S14 of the seventh lens element 170 and the object side S15 of the eighth lens element 180, and the image side S16 of the eighth lens element 180 and the image plane S19. To reduce the processing cost, a stop may be disposed on any one of the object side surface S1 of the first lens element 110, the object side surface S3 of the second lens element 120, the object side surface S5 of the third lens element 130, the object side surface S7 of the fourth lens element 140, the object side surface S9 of the fifth lens element 150, the image side surface S2 of the first lens element 110, the image side surface S4 of the second lens element 120, the image side surface S6 of the third lens element 130, the image side surface S7 of the fourth lens element 140, the image side surface S10 of the fifth lens element 150, the object side surface S11 of the sixth lens element 160, the image side surface S12 of the sixth lens element 160, the object side surface S13 of the seventh lens element 170, the image side surface S14 of the seventh lens element 170, the object side surface S15 of the eighth lens element 180, and the image side surface S16 of the eighth lens element 180. Preferably, the stop STO may be located at the object side of the first lens 110.
To achieve filtering of the non-operating band, the imaging system 10 may also include a filter 190. Preferably, the filter 190 may be located between the image side surface S16 and the imaging surface S19 of the eighth lens 180. The optical filter 190 can be used to filter visible light, so that the infrared band light reaches the imaging surface S19 of the imaging system 10, and thus a clearer stereoscopic picture can be shot in an environment with insufficient light such as at night, which is beneficial to high resolution imaging of the imaging system 10; the filter 190 also serves to filter out infrared light, preventing the infrared light from reaching the imaging surface S19 of the imaging system 10, thereby preventing the infrared light from interfering with normal imaging. The filter 190 may be assembled with each lens as part of the imaging system 10. In other embodiments, the optical filter 190 is not a component of the imaging system 10, and the optical filter 190 may be mounted between the imaging system 10 and the photosensitive element when the imaging system 10 and the photosensitive element are assembled into the lens module 20. In some embodiments, the optical filter 190 may also be disposed on the object side of the first lens 110. In addition, filtering of light in the non-operating band may also be achieved in some embodiments by providing a filter coating on at least one of the first lens 110 through the eighth lens 180.
The materials of the first lens element 110 to the eighth lens element 180 may be plastic or glass. In some embodiments, the material of at least one lens in imaging system 10 may be Plastic (PC), which may be polycarbonate, gum, or the like. In some embodiments, the material of at least one lens in the imaging system 10 may be Glass (GL). The lens with plastic material can reduce the production cost of the imaging system 10, while the lens with glass material can withstand higher or lower temperatures and has excellent optical effect and better stability. In some embodiments, the imaging system 10 may be provided with lenses of different materials, i.e. a combination of glass lenses and plastic lenses may be used, but the specific configuration relationship may be determined according to practical requirements, which is not meant to be exhaustive.
In some embodiments, at least one lens of imaging system 10 has an aspherical profile, which may be referred to as an aspherical profile when at least one side surface (object side or image side) of the lens is aspherical. In one embodiment, both the object side and the image side of each lens can be designed to be aspheric. The aspheric design can help the imaging system 10 more effectively eliminate aberrations and improve imaging quality. In some embodiments, at least one lens in the imaging system 10 may also have a spherical surface shape, which may reduce manufacturing difficulty and manufacturing cost of the lens. In some embodiments, to account for manufacturing costs, manufacturing difficulties, imaging quality, assembly difficulties, etc., the design of each lens surface in the imaging system 10 may be composed of a collocation of aspherical and spherical surface types.
It should also be noted that when a certain lens surface is aspherical, the lens surface may have a negative curvature, in which case the surface will change in type of surface in the radial direction, e.g. one lens surface is convex at the paraxial region and concave near the maximum effective caliber. Specifically, in some embodiments, at least one of the object-side surface S15 and the image-side surface S16 of the eighth lens element 180 has a curvature-of-field structure, and the surface-type designs of the object-side surface S15 and the image-side surface S16 of the eighth lens element 180 at the paraxial region are combined, so that curvature of field and distortion aberration of the fringe field in the large-viewing angle system can be well corrected, and the imaging quality is improved.
In a second aspect, an embodiment of the present application provides a lens module 20. Referring to fig. 11, the lens module 20 includes a lens barrel (not shown), any of the imaging systems 10 described above, and a photosensitive element (not shown). The imaging system 10 is disposed in the lens barrel, and the photosensitive element is disposed on the image side of the imaging system 10.
According to the lens module 20 of the embodiment of the application, the imaging system 10 has good imaging quality by reasonably designing the refractive powers and the surface shapes of the first lens element 110 to the eighth lens element 180. By reasonably defining the distance between the object side surface S1 of the first lens element 110 and the image plane S19 of the imaging system 10 on the optical axis and half of the image height corresponding to the maximum field angle of the imaging system 10, the size of the imaging system 10 can be effectively compressed, and thus the ultra-thin characteristic of the imaging system 10 can be realized. By designing the first lens element 110 with positive refractive power and the second lens element 120 with negative refractive power, on-axis spherical aberration of the imaging system 10 is advantageously corrected; the third lens element 130 and the fourth lens element 140 are designed with refractive power to facilitate correction of astigmatism of the imaging system 10; the fifth lens element 150 with negative refractive power is beneficial to light ray diffusion, thereby increasing the angle of view of the imaging system 10; by designing the sixth lens 160 and the seventh lens 170 with positive refractive power, it is advantageous to balance aberrations generated by the first lens 110 to the fifth lens 150 toward the negative direction; by designing the eighth lens element 180 with negative refractive power, the imaging system 10 can easily secure back focus. By designing the object side surface S1 of the first lens element 110 and the object side surface S3 of the second lens element 120 to be convex, the focusing of the light rays of the imaging system 10 is facilitated, and the optical performance of the imaging system 10 is improved; by designing the image-side surface S16 of the eighth lens element 180 at the paraxial region to be concave, the exit angle of the light beam can be suppressed, the sensitivity of the imaging system 10 can be reduced, and the engineering manufacture of the imaging system 10 can be facilitated; and the reasonable surface type limitation among the lenses is beneficial to improving the assembly yield of the imaging system 10 and reducing the assembly difficulty of the lens module 20.
In a third aspect, an embodiment of the present application provides an electronic device 30. Referring to fig. 11, the electronic device 30 includes a housing (not shown) and the lens module 20, and the lens module 20 is disposed in the housing. The electronic device 30 may be a cell phone, camera, drone, car, etc.
According to the electronic device 30 of the embodiment of the application, the imaging system 10 has good imaging quality by reasonably designing the refractive powers and the surface shapes of the first lens element 110 to the eighth lens element 180. By reasonably defining the distance between the object side surface S1 of the first lens element 110 and the image plane S19 of the imaging system 10 on the optical axis and half of the image height corresponding to the maximum field angle of the imaging system 10, the size of the imaging system 10 can be effectively compressed, and thus the ultra-thin characteristic of the imaging system 10 can be realized. By designing the first lens element 110 with positive refractive power and the second lens element 120 with negative refractive power, on-axis spherical aberration of the imaging system 10 is advantageously corrected; the third lens element 130 and the fourth lens element 140 are designed with refractive power to facilitate correction of astigmatism of the imaging system 10; the fifth lens element 150 with negative refractive power is beneficial to light ray diffusion, thereby increasing the angle of view of the imaging system 10; by designing the sixth lens 160 and the seventh lens 170 with positive refractive power, it is advantageous to balance aberrations generated by the first lens 110 to the fifth lens 150 toward the negative direction; by designing the eighth lens element 180 with negative refractive power, the imaging system 10 can easily secure back focus. By designing the object side surface S1 of the first lens element 110 and the object side surface S3 of the second lens element 120 to be convex, the focusing of the light rays of the imaging system 10 is facilitated, and the optical performance of the imaging system 10 is improved; by designing the image-side surface S16 of the eighth lens element 180 at the paraxial region to be concave, the exit angle of the light beam can be suppressed, the sensitivity of the imaging system 10 can be reduced, and the engineering manufacture of the imaging system 10 can be facilitated; and the reasonable surface type limitation among the lenses is beneficial to improving the assembly yield of the imaging system 10, reducing the assembly difficulty of the lens module 20 in the electronic equipment 30, and simultaneously enabling the electronic equipment 30 to be lighter and thinner.
The imaging system 10 will be described in detail below in connection with specific parameters.
Detailed description of the preferred embodiments
Referring to fig. 1, an imaging system 10 according to an embodiment of the present application includes a stop STO, 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, an eighth lens 180, and a filter 190, which are disposed in order from an object side to an image side along an optical axis. The first lens element 110 with positive refractive power, the second lens element 120 with negative refractive power, the third lens element 130 with positive refractive power, the fourth lens element 140 with positive refractive power, the fifth lens element 150 with negative refractive power, the sixth lens element 160 with positive refractive power, the seventh lens element 170 with positive refractive power, and the eighth lens element 180 with negative refractive power. The object-side surface S1 of the first lens element 110 is convex at a paraxial region, and the image-side surface S2 of the first lens element 110 is concave at a paraxial region. The object-side surface S3 of the second lens element 120 is convex at a paraxial region, and the image-side surface S4 of the second lens element 120 is concave at a paraxial region. The object-side surface S5 of the third lens element 130 is concave at a paraxial region, and the image-side surface S6 of the third lens element 130 is convex at a paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at a paraxial region, and the image-side surface S8 of the fourth lens element 140 is concave at a paraxial region. The object-side surface S9 of the fifth lens element 150 is convex at a paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at a paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at a paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at a paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at a paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at a paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at a paraxial region.
In the embodiment of the present application, the reference wavelength of focal length of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, the relevant parameters of the imaging system 10 are shown in table 1, EFL in table 1 is the focal length of the imaging system 10, FNO represents f-number, HFOV represents half of the maximum field angle of the imaging system 10, and TTL represents the distance from the object side surface S1 of the first lens element 110 to the image surface S19 on the optical axis; the units of focal length, radius of curvature and distance are millimeters.
TABLE 1
The surfaces of the lenses of the imaging system 10 may be aspherical, and for these aspherical surfaces, the aspherical equation for the aspherical surface is:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the surface at the vertex, K is the conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are the aspheric coefficients of the corresponding orders of 4, 6, 8, 10, 12, 14, 16, 18 and 20. In the embodiment of the application, the conical constant K and the aspherical coefficient corresponding to the aspherical surface are shown in table 2:
TABLE 2
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In fig. 2 (a), the longitudinal spherical aberration curves of the embodiment of the present application at the wavelengths of 656.2725nm, 587.5618nm and 486.1327nm are shown, and in fig. 2 (a), it can be seen that the longitudinal spherical aberration curves corresponding to the wavelengths of 656.2725nm, 587.5618nm and 486.1327nm are all within 0.010 mm, which indicates that the imaging quality of the embodiment of the present application is better.
Fig. 2 (b) is a light astigmatism diagram of the imaging system 10 in the first embodiment at a wavelength of 587.5618 nm. Wherein, the abscissa along the X-axis direction represents the focus offset, and the ordinate along the Y-axis direction represents the image height in mm. The astigmatic curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and as can be seen in fig. 2 (b), the astigmatism of the imaging system 10 is well compensated.
Referring to fig. 2 (c), fig. 2 (c) is a graph showing distortion of the imaging system 10 according to the first embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from fig. 2 (c), the distortion of the imaging system 10 is well corrected at a wavelength of 587.5618 nm.
It can be seen from fig. 2 (a), 2 (b) and 2 (c) that the aberration of the imaging system 10 in the present embodiment is small.
Second embodiment
Referring to fig. 3, the imaging system 10 according to the embodiment of the present application includes a stop STO, 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, an eighth lens 180, and a filter 190, which are disposed in order from an object side to an image side along an optical axis. The first lens element 110 with positive refractive power, the second lens element 120 with negative refractive power, the third lens element 130 with positive refractive power, the fourth lens element 140 with positive refractive power, the fifth lens element 150 with negative refractive power, the sixth lens element 160 with positive refractive power, the seventh lens element 170 with positive refractive power, and the eighth lens element 180 with negative refractive power. The object-side surface S1 of the first lens element 110 is convex at a paraxial region, and the image-side surface S2 of the first lens element 110 is concave at a paraxial region. The object-side surface S3 of the second lens element 120 is convex at a paraxial region, and the image-side surface S4 of the second lens element 120 is concave at a paraxial region. The object-side surface S5 of the third lens element 130 is concave at a paraxial region, and the image-side surface S6 of the third lens element 130 is convex at a paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at a paraxial region, and the image-side surface S8 of the fourth lens element 140 is convex at a paraxial region. The object-side surface S9 of the fifth lens element 150 is convex at a paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at a paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at a paraxial region, and the image-side surface S12 of the sixth lens element 160 is concave at a paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at a paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at a paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at a paraxial region.
In the embodiment of the present application, the reference wavelength of focal length of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, the relevant parameters of the imaging system 10 are shown in table 3, EFL in table 3 is the focal length of the imaging system 10, FNO represents f-number, HFOV represents half of the maximum field angle of the imaging system 10, and TTL represents the distance from the object side surface S1 of the first lens element 110 to the image surface S19 on the optical axis; the units of focal length, radius of curvature and distance are millimeters.
TABLE 3 Table 3
The surfaces of the lenses of the imaging system 10 may be aspherical, and for these aspherical surfaces, the aspherical equation for the aspherical surface is:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the surface at the vertex, K is the conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are the aspheric coefficients of the corresponding orders of 4, 6, 8, 10, 12, 14, 16, 18 and 20. In the embodiment of the application, the conical constant K and the aspherical coefficient corresponding to the aspherical surface are shown in table 4:
TABLE 4 Table 4
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As can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field and distortion of the imaging system 10 are all well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
Detailed description of the preferred embodiments
Referring to fig. 5, the imaging system 10 according to the embodiment of the present application includes a stop STO, 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, an eighth lens 180, and a filter 190, which are disposed in order from an object side to an image side along an optical axis. The first lens element 110 with positive refractive power, the second lens element 120 with negative refractive power, the third lens element 130 with negative refractive power, the fourth lens element 140 with positive refractive power, the fifth lens element 150 with negative refractive power, the sixth lens element 160 with positive refractive power, the seventh lens element 170 with positive refractive power, and the eighth lens element 180 with negative refractive power. The object-side surface S1 of the first lens element 110 is convex at a paraxial region, and the image-side surface S2 of the first lens element 110 is concave at a paraxial region. The object-side surface S3 of the second lens element 120 is convex at a paraxial region, and the image-side surface S4 of the second lens element 120 is concave at a paraxial region. The object-side surface S5 of the third lens element 130 is convex at a paraxial region, and the image-side surface S6 of the third lens element 130 is concave at a paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at a paraxial region, and the image-side surface S8 of the fourth lens element 140 is convex at a paraxial region. The object-side surface S9 of the fifth lens element 150 is convex at a paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at a paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at a paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at a paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at a paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at a paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at a paraxial region.
In the embodiment of the present application, the reference wavelength of focal length of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, the relevant parameters of the imaging system 10 are shown in table 5, EFL in table 5 is the focal length of the imaging system 10, FNO represents f-number, HFOV represents half of the maximum field angle of the imaging system 10, and TTL represents the distance from the object side surface S1 of the first lens element 110 to the image surface S19 on the optical axis; the units of focal length, radius of curvature and thickness are millimeters.
TABLE 5
The surfaces of the lenses of the imaging system 10 may be aspherical, and for these aspherical surfaces, the aspherical equation for the aspherical surface is:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the surface at the vertex, K is the conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are the aspheric coefficients of the corresponding orders of 4, 6, 8, 10, 12, 14, 16, 18 and 20. In the embodiment of the application, the conical constant K and the aspherical coefficient corresponding to the aspherical surface are shown in table 6:
TABLE 6
Face number 2 3 4 5
K -4.604E-01 -9.678E+01 -1.052E+01 3.289E+00
A4 8.077E-03 -7.602E-03 -3.246E-02 -3.928E-02
A6 -9.880E-04 1.530E-02 4.454E-02 4.840E-02
A8 4.381E-03 2.042E-04 -4.310E-02 -1.017E-01
A10 5.436E-04 -3.779E-02 3.331E-02 1.958E-01
A12 -9.983E-03 6.969E-02 -1.714E-02 -2.633E-01
A14 1.403E-02 -6.629E-02 3.157E-03 2.273E-01
A16 -9.266E-03 3.601E-02 2.832E-03 -1.181E-01
A18 3.052E-03 -1.048E-02 -1.956E-03 3.369E-02
A20 -4.033E-04 1.258E-03 3.563E-04 -4.050E-03
Face number 6 7 8 9
K 9.900E+01 9.864E+01 -5.102E+01 -9.900E+01
A4 -3.311E-02 -2.962E-02 1.003E-02 1.932E-02
A6 6.095E-03 -3.122E-02 -6.399E-02 -5.023E-02
A8 -2.865E-02 5.928E-02 8.971E-02 3.659E-02
A10 6.334E-02 -6.569E-02 -7.460E-02 -9.121E-03
A12 -9.216E-02 4.776E-02 3.872E-02 -6.479E-03
A14 8.081E-02 -2.363E-02 -1.247E-02 6.305E-03
A16 -4.031E-02 8.288E-03 2.430E-03 -2.325E-03
A18 1.060E-02 -1.875E-03 -2.682E-04 4.257E-04
A20 -1.128E-03 1.945E-04 1.329E-05 -3.181E-05
Face number 10 11 12 13
K -8.252E+01 -2.639E+01 -2.163E+01 -3.041E+01
A4 3.791E-02 9.462E-04 -5.130E-02 5.677E-03
A6 -6.329E-02 3.085E-03 5.196E-02 -3.284E-02
A8 4.629E-02 -1.862E-02 -4.257E-02 2.707E-02
A10 -2.921E-02 1.632E-02 2.378E-02 -1.270E-02
A12 1.509E-02 -7.476E-03 -8.551E-03 3.941E-03
A14 -5.787E-03 2.032E-03 1.982E-03 -7.746E-04
A16 1.441E-03 -3.234E-04 -2.878E-04 9.033E-05
A18 -1.990E-04 2.767E-05 2.373E-05 -5.645E-06
A20 1.136E-05 -9.824E-07 -8.431E-07 1.449E-07
Face number 14 15 16 17
K 4.099E+01 -1.781E+01 -9.674E-02 -4.586E+00
A4 1.277E-01 2.011E-01 -1.030E-01 -7.321E-02
A6 -1.155E-01 -1.609E-01 -1.739E-03 1.901E-02
A8 4.700E-02 6.775E-02 1.402E-02 -2.067E-03
A10 -1.161E-02 -1.808E-02 -4.641E-03 -7.953E-05
A12 1.674E-03 3.182E-03 7.535E-04 4.845E-05
A14 -1.198E-04 -3.697E-04 -7.034E-05 -5.915E-06
A16 1.192E-06 2.727E-05 3.843E-06 3.624E-07
A18 3.397E-07 -1.153E-06 -1.145E-07 -1.145E-08
A20 -1.432E-08 2.117E-08 1.441E-09 1.478E-10
As can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field and distortion of the imaging system 10 are all well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
Detailed description of the preferred embodiments
Referring to fig. 7, the imaging system 10 according to the embodiment of the present application includes a stop STO, 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, an eighth lens 180, and a filter 190, which are disposed in order from an object side to an image side along an optical axis. The first lens element 110 with positive refractive power, the second lens element 120 with negative refractive power, the third lens element 130 with negative refractive power, the fourth lens element 140 with positive refractive power, the fifth lens element 150 with negative refractive power, the sixth lens element 160 with positive refractive power, the seventh lens element 170 with positive refractive power, and the eighth lens element 180 with negative refractive power. The object-side surface S1 of the first lens element 110 is convex at a paraxial region, and the image-side surface S2 of the first lens element 110 is convex at a paraxial region. The object-side surface S3 of the second lens element 120 is convex at a paraxial region, and the image-side surface S4 of the second lens element 120 is concave at a paraxial region. The object-side surface S5 of the third lens element 130 is concave at a paraxial region, and the image-side surface S6 of the third lens element 130 is convex at a paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at a paraxial region, and the image-side surface S8 of the fourth lens element 140 is concave at a paraxial region. The object-side surface S9 of the fifth lens element 150 is concave at a paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at a paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at a paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at a paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at a paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at a paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at a paraxial region.
In the embodiment of the present application, the reference wavelength of focal length of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, the relevant parameters of the imaging system 10 are shown in table 7, EFL is the focal length of the imaging system 10, FNO is the f-number, HFOV is half of the maximum field angle of the imaging system 10, and TTL is the distance from the object side surface S1 of the first lens 110 to the image surface S19 on the optical axis; the units of focal length, radius of curvature and thickness are millimeters.
TABLE 7
The surfaces of the lenses of the imaging system 10 may be aspherical, and for these aspherical surfaces, the aspherical equation for the aspherical surface is:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the surface at the vertex, K is the conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are the aspheric coefficients of the corresponding orders of 4, 6, 8, 10, 12, 14, 16, 18 and 20. In the embodiment of the application, the conical constant K and the aspherical coefficient corresponding to the aspherical surface are shown in table 8:
TABLE 8
Face number 2 3 4 5
K -6.397E-01 -9.900E+01 8.681E+01 3.448E+00
A4 6.979E-03 1.733E-02 -2.733E-03 -2.113E-02
A6 -4.248E-03 -2.402E-02 -1.057E-02 1.222E-02
A8 1.515E-02 4.362E-02 9.727E-03 -3.574E-02
A10 -2.431E-02 -6.425E-02 -1.272E-04 6.924E-02
A12 2.339E-02 6.491E-02 -4.788E-03 -7.467E-02
A14 -1.364E-02 -4.231E-02 3.391E-03 4.865E-02
A16 4.702E-03 1.689E-02 -8.855E-04 -1.883E-02
A18 -8.773E-04 -3.735E-03 3.394E-05 3.993E-03
A20 6.768E-05 3.490E-04 1.380E-05 -3.578E-04
Face number 6 7 8 9
K 8.556E+01 4.959E+00 -7.348E+01 -9.895E+01
A4 -2.048E-02 -3.167E-02 -1.570E-03 5.492E-03
A6 -4.052E-04 -7.206E-03 -2.168E-02 -3.226E-02
A8 -1.662E-02 1.053E-02 2.423E-02 2.900E-02
A10 3.206E-02 -9.119E-03 -1.680E-02 -1.708E-02
A12 -3.455E-02 5.617E-03 7.141E-03 6.360E-03
A14 2.326E-02 -2.159E-03 -1.762E-03 -1.540E-03
A16 -9.354E-03 4.883E-04 1.895E-04 2.367E-04
A18 2.058E-03 -5.809E-05 7.081E-06 -2.107E-05
A20 -1.911E-04 2.360E-06 -2.309E-06 9.345E-07
Face number 10 11 12 13
K 9.900E+01 -2.275E+01 -1.489E+01 6.046E+01
A4 6.683E-02 5.964E-02 -6.374E-03 1.908E-03
A6 -9.807E-02 -8.569E-02 -1.357E-02 -3.414E-02
A8 7.009E-02 5.429E-02 3.713E-03 2.489E-02
A10 -3.459E-02 -2.036E-02 3.418E-03 -1.046E-02
A12 1.187E-02 4.473E-03 -2.646E-03 2.964E-03
A14 -2.925E-03 -5.167E-04 8.312E-04 -5.404E-04
A16 5.116E-04 1.849E-05 -1.401E-04 5.909E-05
A18 -5.576E-05 1.704E-06 1.236E-05 -3.504E-06
A20 2.715E-06 -1.354E-07 -4.483E-07 8.679E-08
Face number 14 15 16 17
K 1.372E+01 -1.316E+01 -1.420E-01 -5.204E+00
A4 1.060E-01 1.698E-01 -1.176E-01 -7.152E-02
A6 -1.013E-01 -1.329E-01 1.920E-02 2.185E-02
A8 4.080E-02 5.351E-02 3.644E-03 -3.485E-03
A10 -1.013E-02 -1.346E-02 -2.001E-03 2.531E-04
A12 1.649E-03 2.218E-03 3.591E-04 2.799E-06
A14 -1.847E-04 -2.420E-04 -3.427E-05 -1.953E-06
A16 1.495E-05 1.694E-05 1.851E-06 1.465E-07
A18 -8.266E-07 -6.880E-07 -5.343E-08 -4.755E-09
A20 2.251E-08 1.225E-08 6.410E-10 5.901E-11
As can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field and distortion of the imaging system 10 are all well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
Detailed description of the preferred embodiments
Referring to fig. 9, the imaging system 10 according to the embodiment of the present application includes a stop STO, 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, an eighth lens 180, and a filter 190, which are disposed in order from an object side to an image side along an optical axis. The first lens element 110 with positive refractive power, the second lens element 120 with negative refractive power, the third lens element 130 with positive refractive power, the fourth lens element 140 with negative refractive power, the fifth lens element 150 with negative refractive power, the sixth lens element 160 with positive refractive power, the seventh lens element 170 with positive refractive power, and the eighth lens element 180 with negative refractive power. The object-side surface S1 of the first lens element 110 is convex at a paraxial region, and the image-side surface S2 of the first lens element 110 is convex at a paraxial region. The object-side surface S3 of the second lens element 120 is convex at a paraxial region, and the image-side surface S4 of the second lens element 120 is concave at a paraxial region. The object-side surface S5 of the third lens element 130 is concave at a paraxial region, and the image-side surface S6 of the third lens element 130 is convex at a paraxial region. The object-side surface S7 of the fourth lens element 140 is concave at a paraxial region, and the image-side surface S8 of the fourth lens element 140 is concave at a paraxial region. The object-side surface S9 of the fifth lens element 150 is concave at a paraxial region, and the image-side surface S10 of the fifth lens element 150 is convex at a paraxial region. The object-side surface S11 of the sixth lens element 160 is concave at a paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at a paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at a paraxial region, and the image-side surface S14 of the seventh lens element 170 is concave at a paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at a paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at a paraxial region.
In the embodiment of the present application, the reference wavelength of focal length of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, the relevant parameters of the imaging system 10 are shown in table 9, EFL is the focal length of the imaging system 10, FNO is the f-number, HFOV is half of the maximum field angle of the imaging system 10, and TTL is the distance from the object side surface S1 of the first lens 110 to the image surface S19 on the optical axis; the units of focal length, radius of curvature and thickness are millimeters.
TABLE 9
The surfaces of the lenses of the imaging system 10 may be aspherical, and for these aspherical surfaces, the aspherical equation for the aspherical surface is:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the surface at the vertex, K is the conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are the aspheric coefficients of the corresponding orders of 4, 6, 8, 10, 12, 14, 16, 18 and 20. In the embodiment of the present application, the conical constant K and the aspherical coefficient corresponding to the aspherical surface are shown in table 10:
table 10
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As can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field and distortion of the imaging system 10 are all well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
The data for the five examples described above are as in table 11 below:
TABLE 11
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 should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present application and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.

Claims (9)

1. An imaging system, comprising, in order from an object side to an image side along an optical axis:
A first lens element with positive refractive power having a convex object-side surface near the optical axis;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface near the optical axis;
a third lens element with refractive power;
a fourth lens element with refractive power;
a fifth lens element with negative refractive power;
a sixth lens element with positive refractive power;
a seventh lens element with positive refractive power having a convex object-side surface near the optical axis;
an eighth lens element with negative refractive power having a convex object-side surface and a concave image-side surface near the optical axis;
eight lenses with refractive power;
wherein the imaging system satisfies the following conditional expression:
1.2≤ImgH*2/TTL≤1.5；0.6≤|Sag S15 |/CT 8 ≤3；
wherein ImgH is half of the image height corresponding to the maximum field angle of the imaging system, TTL is the distance between the object side surface of the first lens and the image surface of the imaging system on the optical axis, sag S15 CT for the sagittal height of the object side surface of the eighth lens at the maximum effective radius 8 To be the instituteAnd the distance between the eighth lens and the optical axis.
2. An imaging system according to claim 1, wherein the imaging system further satisfies the following conditional expression:
0.29≤SD S1 /ImgH≤0.35；
wherein SD is S1 And the ImgH is half of the image height corresponding to the maximum field angle of the imaging system.
3. An imaging system according to claim 1, wherein the imaging system further satisfies the following conditional expression:
0.8≤(ET 2 +ET 3 )/(CT 2 +CT 3 )≤1.3；
wherein ET is 2 ET is the distance in a direction parallel to the optical axis from the maximum effective radius of the object-side surface of the second lens to the maximum effective radius of the image-side surface of the second lens 3 CT is the distance from the maximum effective radius of the object side surface of the third lens to the maximum effective radius of the image side surface of the third lens along the direction parallel to the optical axis 2 CT for the distance between the second lens and the optical axis 3 Is the distance between the third lens and the optical axis.
4. An imaging system according to claim 1, wherein the imaging system further satisfies the following conditional expression:
0.5≤(Rs 15 -Rs 16 )/(Rs 15 +Rs 16 )≤0.65；
Wherein Rs is 15 For the radius of curvature of the object side surface of the eighth lens at the optical axis, rs 16 Is the radius of curvature of the image side surface of the eighth lens at the optical axis.
5. An imaging system according to claim 1, wherein the imaging system further satisfies the following conditional expression:
0.39≤tan(HFOV)/FNO≤0.49；
wherein HFOV is half of the maximum field angle of the imaging system and FNO is the f-number of the imaging system.
6. An imaging system according to claim 1, wherein the imaging system further satisfies the following conditional expression:
0.25mm -1 ≤FNO/TTL≤0.29mm -1 ；
wherein FNO is the f-number of the imaging system, and TTL is the distance from the object side surface of the first lens to the image surface of the imaging system on the optical axis.
7. An imaging system according to claim 1, wherein the imaging system further satisfies the following conditional expression:
0.08≤FBL/TTL≤0.11；
wherein, FBL is the minimum distance between the image side surface of the eighth lens element and the image plane of the imaging system in the optical axis direction, and TTL is the distance between the object side surface of the first lens element and the image plane of the imaging system in the optical axis direction.
8. A lens module, comprising:
a lens barrel;
the imaging system according to any one of claims 1 to 7, provided within the lens barrel;
And the photosensitive element is arranged on the image side of the imaging system.
9. An electronic device, comprising:
a housing; and
The lens module of claim 8, the lens module disposed within the housing.
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