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CN113433656A - Imaging system, lens module and electronic equipment - Google Patents

Imaging system, lens module and electronic equipment Download PDF

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Publication number
CN113433656A
CN113433656A CN202110655712.7A CN202110655712A CN113433656A CN 113433656 A CN113433656 A CN 113433656A CN 202110655712 A CN202110655712 A CN 202110655712A CN 113433656 A CN113433656 A CN 113433656A
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Prior art keywords
lens
imaging system
lens element
image
optical axis
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CN202110655712.7A
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CN113433656B (en
Inventor
曾晗
李明
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Jiangxi Jingchao Optical Co Ltd
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Jiangxi Jingchao Optical 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 imaging system, lens module and electronic equipment, and imaging system includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens along optical axis from object side to image side in proper order. The imaging system satisfies the following conditional expression: 1.2 is not less than ImgH, 2/TTL is not less than 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 between the object side surface of the first lens and the image surface of the imaging system on the optical axis. The imaging system has excellent imaging quality on the premise of ensuring miniaturization and thinning.

Description

Imaging system, lens module and electronic equipment
Technical Field
The application relates to the technical field of optical imaging, in particular to an imaging system, a lens module and electronic equipment.
Background
With the rapid development of portable electronic products such as smart phones in recent years, manufacturers of portable electronic products such as smart phones have put forward more and more new demands on portable electronic products such as smart phones. Imaging lenses of portable electronic products such as smart phones are increasingly pursuing the characteristic of high imaging quality, which provides higher challenges for the design of optical systems.
The photosensitive devices of the lenses of portable electronic products such as smart phones are usually two types, i.e., photosensitive coupling devices or complementary metal oxide semiconductor devices. Due to the continuous development of semiconductor manufacturing technology, the corresponding imaging lens also meets the requirement of high imaging quality. Therefore, an image pickup lens having good image 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 thinning. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an imaging system, which includes, 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 near the optical axis 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 located near the optical axis;
an eighth lens element with negative refractive power having a convex object-side surface near the optical axis 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 an image height corresponding to a maximum field angle of the imaging system, and TTL is a distance on the optical axis from an object-side surface of the first lens to an image plane of the imaging system.
The imaging system of the embodiment of the application has good imaging quality through reasonable design of the refractive power and the surface shape of the first lens element to the eighth lens element. Through the reasonable limitation of the distance from the object side surface of the first lens to the image surface of the imaging system on the optical axis to the half of the image height corresponding to the maximum field angle of the imaging system, the size of the imaging system can be effectively reduced, and the ultrathin characteristic of the imaging system is further realized. By designing the first lens with positive refractive power and the second lens with negative refractive power, the on-axis spherical aberration of the imaging system can 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 rays can be favorably diffused, and the field angle of the imaging system is increased; the sixth lens element and the seventh lens element with positive refractive power are designed to balance the negative aberrations of 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 the back focus. The object side surface of the first lens and the object side surface of the second lens are designed to be convex surfaces, so that light rays of the imaging system can be converged, and the optical performance of the imaging system is improved; the image side surface of the eighth lens element near the optical axis is designed to be concave, so that the emergent angle of light can be suppressed, the sensitivity of the imaging system can be 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≤SDS1/ImgH≤0.35；
wherein, SDS1The effective aperture of the first lens is half of the maximum effective clear aperture of the object-side surface of the first lens, and the ImgH is half of the image height corresponding to the maximum field angle of the imaging system.
Based on the embodiment, the imaging system has the matched aperture and photosensitive surface size by reasonably limiting the half of the maximum effective light-passing aperture of the object-side surface of the first lens and the half of the image height corresponding to the maximum field angle of the imaging system, so that the proper light-passing amount can be obtained, and the definition of the shot image is ensured. When SDS1when/ImgH is less than 0.29, the imaging system is causedThe amount of light passing is insufficient, the relative brightness of the light is insufficient, and the image definition is reduced; when SDS1when/ImgH is greater than 0.35, the amount of light passing through the imaging system is too large, resulting in overexposure and further affecting picture quality.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.8≤(ET2+ET3)/(CT2+CT3)≤1.3；
wherein, ET2A distance, ET, 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 lens in a direction parallel to the optical axis3The distance between the maximum effective radius of the object side surface of the third lens and the maximum effective radius of the image side surface of the third lens along the direction parallel to the optical axis, CT2Distance of said second lens on said optical axis, CT3Is the distance of the third lens on the optical axis.
Based on the above embodiment, the thicknesses of the second lens and the third lens can be reasonably configured by reasonably limiting 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 in 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 in the direction parallel to the optical axis, the distance from the second lens to the optical axis, and the distance from the third lens to the optical axis, which is beneficial to realizing the effect of a large field of view. Meanwhile, the deflection angle of light rays passing through the second lens and the third lens is smaller, the generation of stray light in an 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≤(Rs15-Rs16)/(Rs15+Rs16)≤0.65；
wherein, Rs15Radius of curvature, Rs, of object-side surface of the eighth lens at the optical axis16The radius of curvature of the image side surface of the eighth lens at the optical axis.
Based on the above embodiment, the curvature radius of the object-side surface of the eighth lens element at the optical axis and the curvature radius of the image-side surface of the eighth lens element at the optical axis are reasonably limited, which is beneficial to correcting the aberration generated by the imaging system under the large aperture, so that the refractive power configuration perpendicular to the optical axis direction is uniform, the distortion and the aberration generated by the first lens element to the seventh lens element are greatly corrected, and meanwhile, the eighth lens element can be prevented from being excessively bent, so that the eighth lens element is easier to mold and manufacture.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.39≤tan(HFOV)/FNO≤0.49；
wherein the HFOV is half of a maximum field angle of the imaging system, and the FNO is an f-number of the imaging system.
Based on the embodiment, the half of the maximum field angle of the imaging system and the diaphragm number of the imaging system are reasonably limited, so that the light flux amount of the imaging system can be reasonably controlled, the field angle of the imaging system can be increased, and the requirement of wide angle can be met. When tan (HFOV)/FNO is more than 0.49, the diaphragm number is too small, the diaphragm is too large, and the aberration correction of an imaging system is not facilitated; when tan (hfov)/FNO < 0.39, the angle of view is too small to enlarge 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；
and the FNO is the f-number of the imaging system, and the 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 embodiment, the distance between the object side surface of the first lens and the image surface of the imaging system on the optical axis is reasonableAnd limitation is realized, so that the imaging system can meet the design requirements of large aperture and miniaturization at the same time, and enough light transmission quantity can be provided to meet the requirement of high-definition shooting. When FNO/TTL is more than 0.29mm-1In the process, the imaging system can meet the requirements of miniaturization and large aperture, and the light transmission quantity is insufficient, so that the image definition is reduced; when FNO/TTL is less than 0.25mm-1In this case, the total length of the imaging system is too large, which is disadvantageous for miniaturization of the imaging system.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.6≤|SagS15|/CT8≤3；
among them, SagS15Sagittal height, CT, of the object side of the eighth lens at the maximum effective radius8Is the distance of the eighth lens on the optical axis.
Based on the embodiment, the rise 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 are reasonably limited, so that the shape of the eighth lens can be well controlled, the manufacturing and molding of the eighth lens are facilitated, and the defect of poor molding is reduced. Meanwhile, the field curvature generated by the first lens to the seventh lens can be trimmed, so that the balance of the field curvature of the imaging system is ensured, namely the field curvature of different fields tends 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 | SagS15|/CT8If the value is less than 0.6, the surface shape of the object side surface of the eighth lens at the circumference is too smooth, the deflection capability of the light rays of the off-axis field of view is insufficient, and the correction of distortion and field curvature aberration is not facilitated. When | SagS15|/CT8If the number is more than 3, the object-side surface of the eighth lens element is excessively curved at the circumference, which may result in poor molding and adversely affect the manufacturing yield.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
0.08≤FBL/TTL≤0.11；
the FBL is a minimum distance from an image side surface of the eighth lens element to an image plane of the imaging system in the optical axis direction, and the TTL is a distance from an object side surface of the first lens element to the image plane of the imaging system in the optical axis direction.
Based on the above embodiment, through the reasonable limitation of the minimum distance in the optical axis direction from the image side surface of the eighth lens to the image surface of the imaging system and the distance in the optical axis from the object side surface of the first lens to the image surface of the imaging system, the imaging system is favorably ensured to have a sufficient focusing range, the assembly yield is improved, the depth of focus of the imaging system is ensured to be large, and more depth information of an object space can be acquired.
In a second aspect, an embodiment of the present application provides a lens module, including:
a lens barrel;
an imaging system as in any above, the imaging system disposed within the lens barrel;
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 power and the surface shape of the first lens element to the eighth lens element. Through the reasonable limitation of the distance from the object side surface of the first lens to the image surface of the imaging system on the optical axis to the half of the image height corresponding to the maximum field angle of the imaging system, the size of the imaging system can be effectively reduced, and the ultrathin characteristic of the imaging system is further realized. By designing the first lens with positive refractive power and the second lens with negative refractive power, the on-axis spherical aberration of the imaging system can 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 rays can be favorably diffused, and the field angle of the imaging system is increased; the sixth lens element and the seventh lens element with positive refractive power are designed to balance the negative aberrations of 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 the back focus. The object side surface of the first lens and the object side surface of the second lens are designed to be convex surfaces, so that light rays of the imaging system can be converged, and the optical performance of the imaging system is improved; the image side surface of the eighth lens, which is close to the optical axis, is designed to be a concave surface, so that the emergent angle of light rays can be inhibited, the sensitivity of an imaging system is reduced, and the engineering manufacture of the imaging system is facilitated; and the reasonable surface shape among the lenses is limited, which 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
in the lens module, the lens module is disposed in the housing.
Based on the electronic device in the embodiment of the present application, the imaging system has good imaging quality through reasonable design of the refractive power and the surface shape of the first lens element to the eighth lens element. Through the reasonable limitation of the distance from the object side surface of the first lens to the image surface of the imaging system on the optical axis to the half of the image height corresponding to the maximum field angle of the imaging system, the size of the imaging system can be effectively reduced, and the ultrathin characteristic of the imaging system is further realized. By designing the first lens with positive refractive power and the second lens with negative refractive power, the on-axis spherical aberration of the imaging system can 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 rays can be favorably diffused, and the field angle of the imaging system is increased; the sixth lens element and the seventh lens element with positive refractive power are designed to balance the negative aberrations of 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 the back focus. The object side surface of the first lens and the object side surface of the second lens are designed to be convex surfaces, so that light rays of the imaging system can be converged, and the optical performance of the imaging system is improved; the image side surface of the eighth lens, which is close to the optical axis, is designed to be a concave surface, so that the emergent angle of light rays can be inhibited, the sensitivity of an imaging system is reduced, and the engineering manufacture of the imaging system is facilitated; and the reasonable surface shape among the lenses is limited, which is beneficial to improving the assembly yield of the imaging system, reducing the assembly difficulty of the lens module in the electronic equipment and simultaneously enabling the electronic equipment to be thinner and lighter.
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 description of the embodiments or the prior art 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 imaging system provided in an embodiment of the present application;
fig. 2 is a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of an imaging system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an imaging system provided in the second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of the imaging system provided in the second embodiment of the present application;
fig. 5 is a schematic structural diagram of an imaging system provided in the third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of an imaging system provided in the third embodiment of the present application;
fig. 7 is a schematic structural diagram of an imaging system 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 imaging system according to the fourth embodiment of the present application
Fig. 9 is a schematic structural diagram of an imaging system provided in the fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of an imaging system provided in the fifth embodiment of the present application;
fig. 11 is a schematic diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
With the rapid development of portable electronic products such as smart phones in recent years, manufacturers of portable electronic products such as smart phones have put forward more and more new demands on portable electronic products such as smart phones. Imaging lenses of portable electronic products such as smart phones are increasingly pursuing the characteristic of high imaging quality, which provides higher challenges for the design of optical systems.
The photosensitive devices of the lenses of portable electronic products such as smart phones are usually two types, i.e., photosensitive coupling devices or complementary metal oxide semiconductor devices. Due to the continuous development of semiconductor manufacturing technology, the corresponding imaging lens also meets the requirement of high imaging quality. Therefore, an image pickup lens having good image quality is a problem to be solved at present. Accordingly, the embodiment of the application provides an imaging system, a lens module and an electronic device, and aims to solve the technical problems.
In a first aspect, embodiments of the present application provide 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 element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, a seventh lens element 170, and an eighth lens element 180.
The first lens element 110 with positive refractive power has a convex object-side surface S1 at 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 thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with refractive power. The fourth lens element 140 has refractive power. The fifth lens element 150 has negative refractive power. The sixth lens element 160 with positive refractive power. The seventh lens element 170 with positive refractive power has a convex object-side surface S13 at paraxial region thereof. The eighth lens element 180 with negative refractive power has a convex object-side surface S15 at a paraxial region thereof and a concave image-side surface S16 at the paraxial region thereof, and the eighth lens element 180 with negative refractive power. The imaging system 10 satisfies the following conditional expressions: 1.2 is not less than ImgH × 2/TTL is not more than 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 on the optical axis from the object-side surface S1 of the first lens element 110 to the image plane of the imaging system 10.
The imaging system 10 of the embodiment of the application makes the imaging system 10 have 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 limiting the half of the image height corresponding to the maximum field angle of the imaging system 10 and the distance from the object side surface S1 of the first lens 110 to the image surface S19 of the imaging system 10 on the optical axis, the size of the imaging system 10 can be effectively reduced, and 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, the on-axis spherical aberration of the imaging system 10 can be corrected; the third lens element 130 and the fourth lens element 140 are designed to have refractive power, which is beneficial to correcting astigmatism of the imaging system 10; the fifth lens element 150 is designed to have negative refractive power, which is beneficial to the diffusion of light rays, thereby increasing the field angle of the imaging system 10; the sixth lens element 160 and the seventh lens element 170 with positive refractive power are designed to balance the negative aberrations generated by the first lens element 110 to the fifth lens element 150; the imaging system 10 can easily secure the back focus by designing the eighth lens element 180 with negative refractive power. 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 convergence of 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 light can be suppressed, the sensitivity of the imaging system 10 can be reduced, and the engineering of the imaging system 10 can be facilitated.
The imaging system 10 also satisfies the following conditional expressions: SD not less than 0.29S1/ImgH is less than or equal to 0.35, wherein SDS1Is half the maximum effective clear aperture of the object-side surface S1 of the first lens 110, and ImgH is half the image height corresponding to the maximum field angle of the imaging system 10. By reasonably defining half of the maximum effective clear aperture of the object-side surface S1 of the first lens 110 and half of the image height corresponding to the maximum field angle of the imaging system 10, the imaging system 10 can have matching aperture and photosurface dimensions, and a desired image can be obtainedThe proper light flux ensures the definition of the shot image. When SDS1When ImgH is less than 0.29, the light flux of the imaging system 10 is insufficient, the relative brightness of light is insufficient, and the image definition is reduced; when SDS1when/ImgH > 0.35, the amount of light passing through the imaging system 10 is excessive, resulting in overexposure and further affecting picture quality.
The imaging system 10 also satisfies the following conditional expressions: 0.8 ≤ (ET)2+ET3)/(CT2+CT3) Less than or equal to 1.3, wherein, ET2A distance, ET, from a maximum effective radius of the object-side surface S3 of the second lens 120 to a maximum effective radius of the image-side surface S4 of the second lens 120 in a direction parallel to the optical axis3An upper distance, CT, from the maximum effective radius of the object-side surface S5 of the third lens 130 to the maximum effective radius of the image-side surface S6 of the third lens 130 in a direction parallel to the optical axis2Is the distance of the second lens 120 on the optical axis, CT3Is the distance of the third lens 130 on the optical axis. By reasonably limiting the distance from the maximum effective radius of the object-side surface of the second lens 120 to the maximum effective radius of the image-side surface of the second lens 120 in the direction parallel to the optical axis, the distance from the maximum effective radius of the object-side surface S5 of the third lens 130 to the maximum effective radius of the image-side surface S6 of the third lens 130 in the direction parallel to the optical axis, the distance from the second lens 120 to the optical axis, and the distance from the third lens 130 to the optical axis, the thicknesses of the second lens 120 and the third lens 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, so that the generation of stray light in the imaging system 10 is reduced, and the imaging quality of the imaging system 10 is improved. And the sensitivities 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 expressions: 0.5 (Rs) or less15-Rs16)/(Rs15+Rs16) Less than or equal to 0.65, wherein Rs is15Is an eighthRadius of curvature, Rs, of object side S15 of lens 180 at the optical axis16Is the radius of curvature of the image-side surface S16 of the eighth lens element 180 at the optical axis. By reasonably limiting the curvature radius of the object-side surface S15 of the eighth lens element 180 at the optical axis and the curvature radius of the image-side surface S16 of the eighth lens element 180 at the optical axis, it is beneficial to correct the aberration generated by the imaging system 10 under a large aperture, to make the refractive power configuration perpendicular to the optical axis uniform, to greatly correct the distortion and aberration generated by the first lens element 110 to the seventh lens element 170, and to avoid the eighth lens element 180 from being excessively bent, so that the eighth lens element 180 can be more easily molded and manufactured.
The imaging system 10 also satisfies the following conditional expressions: tan (HFOV)/FNO of 0.39. ltoreq.0.49, wherein HFOV is a half of the maximum field angle of the imaging system 10 and FNO is an 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 amount of the imaging system 10 can be reasonably controlled, which is beneficial to increasing the field angle of the imaging system 10 and meeting the requirement of wide angle. When tan (HFOV)/FNO is more than 0.49, the diaphragm number is too small, the diaphragm is too large, and the aberration correction of the imaging system 10 is not facilitated; when tan (hfov)/FNO < 0.39, the angle of view is too small to enlarge the image range.
The imaging system 10 also satisfies the following conditional expressions: 0.25mm-1≤FNO/TTL≤0.29mm-1Wherein FNO is an f-number of the imaging system 10, and TTL is a distance on the optical axis from the object-side surface S1 of the first lens 110 to the image plane of the imaging system 10. By reasonably limiting the distance between the f-number of the imaging system 10 and the object-side surface S1 of the first lens 110 and the image plane of the imaging system 10 on the optical axis, the imaging system 10 can meet the design requirements of large aperture and miniaturization, i.e., can provide enough light transmission amount to meet the requirement of high-definition shooting. When FNO/TTL is more than 0.29mm-1Meanwhile, the imaging system 10 cannot meet the requirement of a large aperture while meeting the requirement of miniaturization, and the light transmission quantity is insufficient, so that the image definition is reduced; when FNO/TTL is less than 0.25mm-1The overall length of the imaging system 10 is too large, which is disadvantageous for miniaturization of the imaging system 10.
The imaging system 10 also satisfies the following conditional expressions: sag of 0.6 ≤S15|/CT8Less than or equal to 3, wherein, SagS15The sagittal height, CT, of the object side surface S15 of the eighth lens element 180 at the maximum effective radius8Is the distance of the eighth lens element 180 on the optical axis. Among them, note that the above Sags15The rise in (3) is the distance from the intersection point of the object-side surface S15 of the eighth lens 180 and the optical axis to the maximum effective clear aperture of the surface (i.e., the maximum effective radius of the surface) in the direction parallel to the optical axis; when the value is a positive value, the maximum effective clear aperture of the surface is closer to the image side of the imaging system 10 than the center of the surface in a direction parallel to the optical axis of the imaging system 10; when the value is negative, the maximum effective clear aperture of the face is closer to the object side of the imaging system 10 than the center of the face in a direction parallel to the optical axis of the imaging system 10.
Through reasonable limitation of the rise of the object side surface of the eighth lens 180 at the maximum effective radius and the distance of the eighth lens 180 on the optical axis, the shape of the eighth lens 180 can be well controlled, the manufacture and molding of the eighth lens 180 are facilitated, and the defect of poor molding is reduced. Meanwhile, the field curvature generated by the first lens 110 to the seventh lens 170 may be trimmed, so as to ensure the balance of the field curvature of the imaging system 10, that is, the field curvature of different fields tends to be balanced, thereby making the image quality of the whole image of the imaging system 10 uniform, and improving the imaging quality of the imaging system 10. When SagS 15/CT 8 is less than 0.6, the object-side surface of the eighth lens element 180 has a smooth surface at the circumference, and the light rays in the off-axis field are not deflected enough to correct the distortion and the curvature of field. When the total of SagS 15/CT 8 > 3, the object-side surface S15 of the eighth lens element 180 is excessively curved at the circumference, which may result in poor molding and poor manufacturing yield.
The imaging system 10 also satisfies the following conditional expressions: FBL/TTL is 0.08-0.11, wherein FBL is 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 in the optical axis direction, and TTL is the distance from the object side surface S1 of the first lens element 110 to the image surface S19 of the imaging system 10 in the optical axis direction. Through the reasonable limitation of the minimum distance from the image side surface S16 of the eighth lens 180 to the image surface S19 of the imaging system 10 in the optical axis direction and the distance from the object side surface S1 of the first lens 110 to the image surface S19 of the imaging system 10 in the optical axis direction, the imaging system 10 is favorably ensured to have a sufficient focusing range, the assembly yield is improved, meanwhile, the imaging system 10 is ensured to have a large focal depth, and more depth information of an object space can be acquired.
To reduce stray light to enhance imaging, the imaging system 10 may also include a stop STO. The 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 image plane S19. For example, stop STO can be located: the image side surface S2 of the first lens 110, the image side surface S2 of the first lens 110 and the object side surface S3 of the second lens 120, the image side surface S4 of the second lens 120 and the object side surface S5 of the third lens 130, the image side surface S6 of the third lens 130 and the object side surface S7 of the fourth lens 140, the image side surface S8 of the fourth lens 140 and the object side surface S9 of the fifth lens 150, the image side surface S10 of the fifth lens 150 and the object side surface S11 of the sixth lens 160, the image side surface S12 of the sixth lens 160 and the object side surface S13 of the seventh lens 170, the image side surface S14 of the seventh lens 170 and the object side surface S15 of the eighth lens 180, and the image side surface S16 of the eighth lens 180 and the imaging surface S19. To reduce the manufacturing cost, the stop STO may be disposed on any one of the object-side surface S1 of the first lens 110, the object-side surface S3 of the second lens 120, the object-side surface S5 of the third lens 130, the object-side surface S7 of the fourth lens 140, the object-side surface S9 of the fifth lens 150, the image-side surface S2 of the first lens 110, the image-side surface S4 of the second lens 120, the image-side surface S6 of the third lens 130, the image-side surface S7 of the fourth lens 140, the image-side surface S10 of the fifth lens 150, the object-side surface S11 of the sixth lens 160, the image-side surface S12 of the sixth lens 160, the object-side surface S13 of the seventh lens 170, the image-side surface S14 of the seventh lens 170, the object-side surface S15 of the eighth lens 180, and the image-side surface S16 of the eighth lens 180. Preferably, the stop STO may be located on the object side of the first lens 110.
To achieve filtering of the non-operating bands, the imaging system 10 may also include an optical filter 190. Preferably, the optical filter 190 may be located between the image side surface S16 and the image plane S19 of the eighth lens 180. The optical filter 190 may be configured to filter visible light, so that infrared band light reaches the imaging surface S19 of the imaging system 10, and thus a clearer and stereoscopic image may be taken in environments with insufficient light, such as at night, and high-resolution imaging of the imaging system 10 is facilitated; the filter 190 is also used to filter the infrared light and prevent 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 filter 190 is not a component of the imaging system 10, and the filter 190 can be installed 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 filter 190 may also be disposed on the object side of the first lens 110. In addition, in some embodiments, the filtering of the non-operating band light can also be achieved by disposing a filtering coating on at least one of the first lens 110 to the eighth lens 180.
The first lens element 110 to the eighth lens element 180 may be made of plastic or glass. In some embodiments, at least one lens of the imaging system 10 may be made of Plastic (PC), which may be polycarbonate, gum, etc. In some embodiments, at least one lens of the imaging system 10 may be made of Glass (GL). The lens made of plastic can reduce the production cost of the imaging system 10, while the lens made of glass can endure higher or lower temperature and has excellent optical effect and better stability. In some embodiments, lenses of different materials may be disposed in the imaging system 10, i.e. a design combining a glass lens and a plastic lens may be adopted, but the specific configuration relationship may be determined according to practical requirements and is not exhaustive here.
In some embodiments, at least one lens of imaging system 10 has an aspheric surface profile, which may be referred to as having an aspheric surface profile when at least one side surface (object side or image side) of the lens is aspheric. In one embodiment, both the object-side surface and the image-side surface of each lens can be designed to be aspheric. The aspheric design can help the imaging system 10 to eliminate aberrations more effectively and improve imaging quality. In some embodiments, at least one lens in the imaging system 10 may also have a spherical surface shape, and the design of the spherical surface shape may reduce the difficulty and cost of manufacturing the lens. In some embodiments, the lens surfaces of the imaging system 10 may be designed to have aspheric and spherical shapes for the sake of manufacturing cost, manufacturing difficulty, imaging quality, assembly difficulty, etc.
It should also be noted that when a lens surface is aspheric, the lens surface may have a reverse curvature where the surface will change its type in the radial direction, e.g. one lens surface is convex near the optical axis and concave near the maximum effective aperture. 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 reverse curvature structure, and the object-side surface S15 and the image-side surface S16 of the eighth lens element 180 are designed to have a planar shape at a paraxial region, so that the field curvature and distortion aberration of the peripheral field in a large-angle system can be well corrected, and the imaging quality can be improved.
In a second aspect, the present embodiment provides a lens module 20. Referring to fig. 11, the lens module 20 includes a lens barrel (not shown), the above-mentioned arbitrary imaging system 10, 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.
Based on the lens module 20 in the embodiment of the present application, the imaging system 10 has good imaging quality through reasonable design of the refractive power and the surface shape of the first lens element 110 to the eighth lens element 180. By reasonably limiting the half of the image height corresponding to the maximum field angle of the imaging system 10 and the distance from the object side surface S1 of the first lens 110 to the image surface S19 of the imaging system 10 on the optical axis, the size of the imaging system 10 can be effectively reduced, and 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, the on-axis spherical aberration of the imaging system 10 can be corrected; the third lens element 130 and the fourth lens element 140 are designed to have refractive power, which is beneficial to correcting astigmatism of the imaging system 10; the fifth lens element 150 is designed to have negative refractive power, which is beneficial to the diffusion of light rays, thereby increasing the field angle of the imaging system 10; the sixth lens element 160 and the seventh lens element 170 with positive refractive power are designed to balance the negative aberrations generated by the first lens element 110 to the fifth lens element 150; the imaging system 10 can easily secure the back focus by designing the eighth lens element 180 with negative refractive power. 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 convergence of 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 light can be suppressed, the sensitivity of the imaging system 10 can be reduced, and the engineering of the imaging system 10 can be facilitated; and the reasonable surface shape among the lenses is limited, which is helpful to improve the assembly yield of the imaging system 10 and reduce 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, automobile, etc.
Based on the electronic device 30 in the embodiment of the present application, the imaging system 10 has good imaging quality through reasonable design of the refractive power and the surface shape of the first lens element 110 to the eighth lens element 180. By reasonably limiting the half of the image height corresponding to the maximum field angle of the imaging system 10 and the distance from the object side surface S1 of the first lens 110 to the image surface S19 of the imaging system 10 on the optical axis, the size of the imaging system 10 can be effectively reduced, and 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, the on-axis spherical aberration of the imaging system 10 can be corrected; the third lens element 130 and the fourth lens element 140 are designed to have refractive power, which is beneficial to correcting astigmatism of the imaging system 10; the fifth lens element 150 is designed to have negative refractive power, which is beneficial to the diffusion of light rays, thereby increasing the field angle of the imaging system 10; the sixth lens element 160 and the seventh lens element 170 with positive refractive power are designed to balance the negative aberrations generated by the first lens element 110 to the fifth lens element 150; the imaging system 10 can easily secure the back focus by designing the eighth lens element 180 with negative refractive power. 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 convergence of 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 light can be suppressed, the sensitivity of the imaging system 10 can be reduced, and the engineering of the imaging system 10 can be facilitated; moreover, the reasonable surface shape between the lenses is limited, which is helpful to improve the assembly yield of the imaging system 10, reduce the assembly difficulty of the lens module 20 in the electronic device 30, and make the electronic device 30 thinner and lighter.
The imaging system 10 will be described in detail below with reference to specific parameters.
Detailed description of the preferred embodiment
Referring to fig. 1, a schematic structural diagram of an imaging system 10 according to an embodiment of the present disclosure, the imaging system 10 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 sequentially disposed 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 the paraxial region, and the image-side surface S2 of the first lens element 110 is concave at the paraxial region. The object-side surface S3 of the second lens element 120 is convex at the paraxial region, and the image-side surface S4 of the second lens element 120 is concave at the paraxial region. The object-side surface S5 of the third lens element 130 is concave at the paraxial region, and the image-side surface S6 of the third lens element 130 is convex at the paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element 140 is concave at the paraxial region. The object-side surface S9 of the fifth lens element 150 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at the paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at the paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at the paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at the paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at the paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at the paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at the paraxial region.
In the embodiment of the present application, the focal length reference wavelength of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, 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 is the f-number, HFOV is half of the maximum field angle of the imaging system 10, and TTL is the distance on the optical axis from the object-side surface S1 to the image surface S19 of the first lens 110; the units of focal length, radius of curvature and distance are in millimeters.
TABLE 1
Figure BDA0003112672890000081
Figure BDA0003112672890000091
The surfaces of the lenses of the imaging system 10 may be aspherical, for which the aspherical equation for the aspherical surface is:
Figure BDA0003112672890000092
z is the distance from a corresponding point on the aspheric surface to a 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 represents the curvature of the surface at the vertex, K represents a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 respectively represent 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 corresponding orders. 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
Figure BDA0003112672890000093
Figure BDA0003112672890000101
Fig. 2(a) is a graph of longitudinal spherical aberration of light rays with wavelengths of 656.2725nm, 587.5618nm and 486.1327nm in the embodiment of the present application, and it can be seen from fig. 2(a) that the longitudinal spherical aberration 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 diagram of astigmatism of light at a wavelength of 587.5618nm of the imaging system 10 in the first embodiment. Wherein the abscissa in the X-axis direction represents the focus offset and the ordinate in the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and as can be seen from fig. 2(b), the astigmatism of the imaging system 10 is well compensated.
Referring to fig. 2(c), fig. 2(c) is a graph illustrating the distortion of the imaging system 10 at 587.5618nm in the first embodiment. 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.
Detailed description of the invention
Referring to fig. 3, a schematic structural diagram of an imaging system 10 according to an embodiment of the present disclosure, the imaging system 10 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 sequentially disposed 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 the paraxial region, and the image-side surface S2 of the first lens element 110 is concave at the paraxial region. The object-side surface S3 of the second lens element 120 is convex at the paraxial region, and the image-side surface S4 of the second lens element 120 is concave at the paraxial region. The object-side surface S5 of the third lens element 130 is concave at the paraxial region, and the image-side surface S6 of the third lens element 130 is convex at the paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element 140 is convex at the paraxial region. The object-side surface S9 of the fifth lens element 150 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at the 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 the paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at the paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at the paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at the paraxial region.
In the embodiment of the present application, the focal length reference wavelength of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, 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 the f-number, HFOV represents half of the maximum field angle of the imaging system 10, and TTL represents the distance on the optical axis from the object-side surface S1 to the image surface S19 of the first lens 110; the units of focal length, radius of curvature and distance are in millimeters.
TABLE 3
Figure BDA0003112672890000111
The surfaces of the lenses of the imaging system 10 may be aspherical, for which the aspherical equation for the aspherical surface is:
Figure BDA0003112672890000112
z is the distance from a corresponding point on the aspheric surface to a 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 represents the curvature of the surface at the vertex, K represents a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 respectively represent 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 corresponding orders. 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
Figure BDA0003112672890000113
Figure BDA0003112672890000121
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 well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
Detailed description of the preferred embodiment
Referring to fig. 5, a schematic structural diagram of an imaging system 10 according to an embodiment of the present application, the imaging system 10 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 sequentially disposed 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 the paraxial region, and the image-side surface S2 of the first lens element 110 is concave at the paraxial region. The object-side surface S3 of the second lens element 120 is convex at the paraxial region, and the image-side surface S4 of the second lens element 120 is concave at the paraxial region. The object-side surface S5 of the third lens element 130 is convex at the paraxial region, and the image-side surface S6 of the third lens element 130 is concave at the paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element 140 is convex at the paraxial region. The object-side surface S9 of the fifth lens element 150 is convex at the paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at the paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at the paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at the paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at the paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at the paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at the paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at the paraxial region.
In the embodiment of the present application, the focal length reference wavelength of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, 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 is the f-number, HFOV is half of the maximum field angle of the imaging system 10, and TTL is the distance on the optical axis from the object-side surface S1 to the image surface S19 of the first lens 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 5
Figure BDA0003112672890000131
The surfaces of the lenses of the imaging system 10 may be aspherical, for which the aspherical equation for the aspherical surface is:
Figure BDA0003112672890000132
z is the distance from a corresponding point on the aspheric surface to a 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 represents the curvature of the surface at the vertex, K represents a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 respectively represent 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 corresponding orders. 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 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
Number of noodles 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
Number of noodles 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
Number of noodles 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 well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
Detailed description of the invention
Referring to fig. 7, a schematic structural diagram of an imaging system 10 according to an embodiment of the present application, the imaging system 10 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 arranged 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 the paraxial region, and the image-side surface S2 of the first lens element 110 is convex at the paraxial region. The object-side surface S3 of the second lens element 120 is convex at the paraxial region, and the image-side surface S4 of the second lens element 120 is concave at the paraxial region. The object-side surface S5 of the third lens element 130 is concave at the paraxial region, and the image-side surface S6 of the third lens element 130 is convex at the paraxial region. The object-side surface S7 of the fourth lens element 140 is convex at the paraxial region, and the image-side surface S8 of the fourth lens element 140 is concave at the paraxial region. The object-side surface S9 of the fifth lens element 150 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element 150 is concave at the paraxial region. The object-side surface S11 of the sixth lens element 160 is convex at the paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at the paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at the paraxial region, and the image-side surface S14 of the seventh lens element 170 is convex at the paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at the paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at the paraxial region.
In the embodiment of the present application, the focal length reference wavelength of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, relevant parameters of the imaging system 10 are shown in table 7, EFL in table 7 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 on the optical axis from the object-side surface S1 to the image surface S19 of the first lens 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 7
Figure BDA0003112672890000151
The surfaces of the lenses of the imaging system 10 may be aspherical, for which the aspherical equation for the aspherical surface is:
Figure BDA0003112672890000152
z is the distance from a corresponding point on the aspheric surface to a 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 represents the curvature of the surface at the vertex, K represents a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 respectively represent 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 corresponding orders. 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 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
Number of noodles 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
Number of noodles 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
Number of noodles 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 well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
Detailed description of the preferred embodiment
Referring to fig. 9, a schematic structural diagram of an imaging system 10 according to an embodiment of the present disclosure, the imaging system 10 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 sequentially disposed 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 the paraxial region, and the image-side surface S2 of the first lens element 110 is convex at the paraxial region. The object-side surface S3 of the second lens element 120 is convex at the paraxial region, and the image-side surface S4 of the second lens element 120 is concave at the paraxial region. The object-side surface S5 of the third lens element 130 is concave at the paraxial region, and the image-side surface S6 of the third lens element 130 is convex at the paraxial region. The object-side surface S7 of the fourth lens element 140 is concave at the paraxial region, and the image-side surface S8 of the fourth lens element 140 is concave at the paraxial region. The object-side surface S9 of the fifth lens element 150 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element 150 is convex at the paraxial region. The object-side surface S11 of the sixth lens element 160 is concave at the paraxial region, and the image-side surface S12 of the sixth lens element 160 is convex at the paraxial region. The object-side surface S13 of the seventh lens element 170 is convex at the paraxial region, and the image-side surface S14 of the seventh lens element 170 is concave at the paraxial region. The object-side surface S15 of the eighth lens element 180 is convex at the paraxial region, and the image-side surface S16 of the eighth lens element 180 is concave at the paraxial region.
In the embodiment of the present application, the focal length reference wavelength of each lens is 587.6nm, the reference wavelength of refractive index and abbe number is 587.56nm, relevant parameters of the imaging system 10 are shown in table 9, EFL in table 9 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 on the optical axis from the object-side surface S1 to the image surface S19 of the first lens 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 9
Figure BDA0003112672890000171
The surfaces of the lenses of the imaging system 10 may be aspherical, for which the aspherical equation for the aspherical surface is:
Figure BDA0003112672890000181
z is the distance from a corresponding point on the aspheric surface to a 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 represents the curvature of the surface at the vertex, K represents a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 respectively represent 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 corresponding orders. 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
Figure BDA0003112672890000182
Figure BDA0003112672890000191
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 well controlled, so that the imaging system 10 of this embodiment has good imaging quality.
The data for the five sets of examples above are as in table 11 below:
TABLE 11
Figure BDA0003112672890000192
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 exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

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 near the optical axis 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 located near the optical axis;
an eighth lens element with negative refractive power having a convex object-side surface near the optical axis 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 an image height corresponding to a maximum field angle of the imaging system, and TTL is a distance on the optical axis from an object-side surface of the first lens to an image plane of the imaging system.
2. An imaging system as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.29≤SDS1/ImgH≤0.35；
wherein, SDS1The effective aperture of the first lens is half of the maximum effective clear aperture of the object-side surface of the first lens, and the ImgH is half of the image height corresponding to the maximum field angle of the imaging system.
3. An imaging system as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.8≤(ET2+ET3)/(CT2+CT3)≤1.3；
wherein, ET2A distance, ET, 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 lens in a direction parallel to the optical axis3The distance between the maximum effective radius of the object side surface of the third lens and the maximum effective radius of the image side surface of the third lens along the direction parallel to the optical axis, CT2Distance of said second lens on said optical axis, CT3Is the distance of the third lens on the optical axis.
4. An imaging system as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.5≤(Rs15-Rs16)/(Rs15+Rs16)≤0.65；
wherein, Rs15Radius of curvature, Rs, of object-side surface of the eighth lens at the optical axis16The radius of curvature of the image side surface of the eighth lens at the optical axis.
5. An imaging system as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.39≤tan(HFOV)/FNO≤0.49；
wherein the HFOV is half of a maximum field angle of the imaging system, and the FNO is an f-number of the imaging system.
6. An imaging system as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.25mm-1≤FNO/TTL≤0.29mm-1；
and the FNO is the f-number of the imaging system, and the 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 as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.6≤|SagS15|/CT8≤3；
among them, SagS15Sagittal height, CT, of the object side of the eighth lens at the maximum effective radius8Is the distance of the eighth lens on the optical axis.
8. An imaging system as claimed in claim 1, wherein the imaging system further satisfies the following conditional expressions:
0.08≤FBL/TTL≤0.11；
the FBL is a minimum distance from an image side surface of the eighth lens element to an image plane of the imaging system in the optical axis direction, and the TTL is a distance from an object side surface of the first lens element to the image plane of the imaging system in the optical axis direction.
9. A lens module, comprising:
a lens barrel;
the imaging system of any of claims 1 to 8, disposed within the lens barrel;
the photosensitive element is arranged on the image side of the imaging system.
10. An electronic device, comprising:
a housing; and
the lens module of claim 9, the lens module disposed within the housing.
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