WO2021184165A1 - 光学系统、摄像模组及电子装置 - Google Patents

光学系统、摄像模组及电子装置 Download PDF

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Publication number
WO2021184165A1
WO2021184165A1 PCT/CN2020/079517 CN2020079517W WO2021184165A1 WO 2021184165 A1 WO2021184165 A1 WO 2021184165A1 CN 2020079517 W CN2020079517 W CN 2020079517W WO 2021184165 A1 WO2021184165 A1 WO 2021184165A1
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Prior art keywords
lens
optical system
object side
convex
image side
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PCT/CN2020/079517
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English (en)
French (fr)
Inventor
杨健
李明
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江西晶超光学有限公司
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Application filed by 江西晶超光学有限公司 filed Critical 江西晶超光学有限公司
Priority to PCT/CN2020/079517 priority Critical patent/WO2021184165A1/zh
Priority to US17/609,381 priority patent/US20220214521A1/en
Publication of WO2021184165A1 publication Critical patent/WO2021184165A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present invention relates to the field of photography, in particular to an optical system, a camera module and an electronic device.
  • the performance of the camera has also undergone earth-shaking changes as users' demand for camera quality increases.
  • the system can have more space and freedom to adjust the incident light path. This is one of the most efficient ways to improve the imaging quality of the optical system.
  • how to properly configure the performance of each lens in the optical system to ensure the high imaging quality of the system is one of the main concerns of the current lens design.
  • an optical system is provided.
  • An optical system from the object side to the image side, includes:
  • a first lens with refractive power the object side of the first lens is concave at the paraxial position, and the image side is convex at the paraxial position;
  • a second lens with positive refractive power the object side of the second lens is convex at the paraxial position, and the image side is concave at the paraxial position;
  • a third lens with positive refractive power the image side of the third lens is convex at the paraxial position
  • a fourth lens with negative refractive power the object side of the fourth lens is concave at the paraxial position
  • the fifth lens with refractive power is the fifth lens with refractive power
  • a sixth lens with negative refractive power the object side of the sixth lens is concave at the paraxial position
  • a seventh lens with positive refractive power the object side of the seventh lens is convex at the paraxial position;
  • An eighth lens with negative refractive power the object side surface of the eighth lens is convex at the paraxial position, and the image side surface is concave at the paraxial position.
  • a camera module includes a photosensitive element and the above-mentioned optical system, and the photosensitive element is arranged on the image side of the optical system.
  • An electronic device includes a fixing part and the above-mentioned camera module, and the camera module is arranged on the fixing part.
  • FIG. 1 is a schematic diagram of the optical system provided by the first embodiment of the application.
  • FIG. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical system in the first embodiment;
  • FIG. 3 is a schematic diagram of the optical system provided by the second embodiment of the application.
  • FIG. 5 is a schematic diagram of the optical system provided by the third embodiment of the application.
  • Fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the third embodiment;
  • FIG. 7 is a schematic diagram of an optical system provided by a fourth embodiment of this application.
  • FIG. 9 is a schematic diagram of an optical system provided by a fifth embodiment of this application.
  • FIG. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the fifth embodiment;
  • FIG. 11 is a schematic diagram of an optical system provided by a sixth embodiment of this application.
  • Fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the sixth embodiment;
  • FIG. 13 is a schematic diagram of a camera module provided by an embodiment of the application.
  • FIG. 14 is a schematic diagram of an electronic device provided by an embodiment of the application.
  • the optical system 10 includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, and a fifth lens in order from the object side to the image side.
  • the first lens L1 has positive or negative refractive power
  • the second lens L2 has positive refractive power
  • the third lens L3 has positive refractive power
  • the fourth lens L4 has negative refractive power
  • the fifth lens L5 has positive refractive power.
  • sixth lens L6 has negative refractive power
  • seventh lens L7 has positive refractive power
  • eighth lens L8 has negative refractive power.
  • the first lens L1 to the eighth lens L8 each contain only one lens, and each lens in the optical system 10 is arranged coaxially with the stop STO, that is, the optical axis of each lens and the center of the stop STO are on the same straight line. It may be referred to as the optical axis of the optical system 10.
  • the first lens L1 includes an object side surface S1 and an image side surface S2
  • the second lens L2 includes an object side surface S3 and an image side surface S4
  • the third lens L3 includes an object side surface S5 and an image side surface S6,
  • the fourth lens L4 includes an object side surface S7 and an image side surface.
  • S8 the fifth lens L5 includes the object side S9 and the image side S10
  • the sixth lens includes the object side S11 and the image side S12
  • the seventh lens includes the object side S13 and the image side S14
  • the eighth lens includes the object side S15 and the image side S16.
  • the optical system 10 also has an imaging surface S19, which is located on the image side of the eighth lens.
  • the imaging surface S19 of the optical system 10 coincides with the photosensitive surface of the photosensitive element.
  • the imaging surface S19 can be regarded as the photosensitive surface of the photosensitive element.
  • the object side S1 of the first lens L1 is concave at the paraxial position, and the image side S2 is convex at the paraxial position; the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is at the paraxial position.
  • the paraxial position is concave; the image side surface S6 of the third lens L3 is convex at the paraxial position; the object side surface S7 of the fourth lens L4 is concave at the paraxial position; the object side S11 of the sixth lens is concave at the paraxial position; The object side surface S13 of the seventh lens is convex at the paraxial position; the object side surface S15 of the eighth lens is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position.
  • the second lens L2 by making the second lens L2 have a positive refractive power, the ability of the system to correct aberrations can be effectively improved, and the sensitivity of the system can be reduced.
  • the object side surface S3 of the second lens L2 By designing the object side surface S3 of the second lens L2 as a convex surface, the second lens L2 can bear more positive refractive power, and can effectively reduce the aberration of the entire system, reduce the system sensitivity, and improve the system yield. It is also conducive to the processing and assembly of subsequent structures.
  • the image side surface S6 of the third lens L3 is designed as a convex surface, which can effectively cooperate with the first lens L1 and the second lens L2 to reduce the system spherical aberration and improve the system aberration correction ability.
  • the object side surface S13 of the seventh lens L7 is designed as a convex surface, so that the seventh lens L7 can bear a reasonable positive refractive power to share part of the refractive power of the system and avoid excessive concentration of the positive refractive power on the second lens L2 and the third lens L3 .
  • further cooperating with the negative refractive power of the fourth lens L4 and the positive refractive power of the seventh lens L7 will facilitate the distribution of the refractive power of the entire system, avoid excessive concentration of refractive power, and also help balance the system's vertical chromatic aberration and lateral chromatic aberration. .
  • the above-mentioned optical system 10 can have excellent imaging quality by arranging the refractive power and the surface relationship of each lens well.
  • the object side surface and the image side surface of the first lens L1 to the eighth lens L8 are both aspherical, and the object side surface S15 and the image side surface S16 of the eighth lens L8 both have inflection points.
  • the aspherical configuration can further help the optical system 10 to eliminate aberrations and solve the problem of distortion of the field of view.
  • it is also conducive to the miniaturization design of the optical system 10, so that the optical system 10 can have excellent performance while maintaining the miniaturization design. Optical effect.
  • the object side surface of any one of the first lens L1 to the eighth lens L8 can be spherical or aspherical; the image side surface of any one of the first lens L1 to the eighth lens L8 can be The spherical surface may also be an aspherical surface.
  • the aberration problem can also be effectively eliminated through the cooperation of the spherical surface and the aspherical surface, so that the optical system 10 has an excellent imaging effect and at the same time improves the flexibility of lens design and assembly.
  • the eighth lens L8 is an aspheric lens, it will help to finally correct the aberrations generated by the front lenses, thereby helping to improve the imaging quality.
  • the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are for reference only and are not drawn strictly to scale.
  • the calculation of the aspheric surface can refer to the aspheric formula:
  • Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the apex 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 apex of the aspheric surface
  • k is the conic coefficient
  • Ai is the aspheric surface The coefficient corresponding to the higher order term of the i-th term in the face formula.
  • the surface when the object side or image side of a certain lens is aspherical, the surface can be a convex surface or a concave surface as a whole; or the surface can also be designed to have inflection points. Structure, the shape of the surface from the center to the edge will change at this time, for example, the surface is convex at the center and concave at the edge.
  • one side of the lens is convex at the optical axis (the central area of the side) (the central area of the side), it can be understood that the area of the side of the lens near the optical axis is convex, so It can also be considered that the side surface is convex at the paraxial position; when describing a side surface of the lens as a concave surface at the circumference, it can be understood that the side surface near the maximum effective semi-aperture is a concave surface.
  • the shape of the side surface from the center (optical axis) to the edge direction can be a pure convex surface; or a convex shape from the center first Transition to a concave shape, and then become convex when approaching the maximum effective half-aperture.
  • This is only an example to illustrate the relationship between the optical axis and the circumference.
  • the multiple shapes and structures (concave-convex relationship) on the side are not fully reflected, but other situations can be derived from the above examples, and should also be regarded as The content recorded in this application.
  • the material of each lens in the optical system 10 is plastic.
  • the material of each lens in the optical system 10 is glass.
  • the plastic lens can reduce the weight of the optical system 10 and the production cost, while the glass lens can withstand higher temperatures and have excellent optical effects.
  • the material of the first lens L1 is glass
  • the material of the second lens L2 to the eighth lens L8 is plastic.
  • these glass lenses located on the object side have a good resistance to extreme environments, and are not easily affected by the object side environment to cause aging. Therefore, when the optical system 10 is exposed to high temperatures and other extreme environments, this structure can be more effective. A good balance between the optical performance and cost of the system.
  • the configuration relationship of the lens materials in the optical system 10 is not limited to the foregoing embodiment, and the material of any lens may be plastic or glass.
  • the optical system 10 includes an infrared cut-off filter L9, and the infrared cut-off filter L9 is disposed on the image side of the eighth lens L8, and is fixedly disposed relative to each lens in the optical system 10.
  • the infrared cut filter L9 includes an object side surface S17 and an image side surface S18.
  • the infrared cut filter L9 is used to filter out the infrared light and prevent the infrared light from reaching the imaging surface S19 of the system, thereby preventing the infrared light from interfering with normal imaging.
  • the infrared cut filter L9 can be assembled with each lens as a part of the optical system 10. In other embodiments, the infrared cut filter L9 is not a component of the optical system 10.
  • the infrared cut filter L9 can be installed in the optical system 10 and the photosensitive element to form a camera module. Between the system 10 and the photosensitive element. In some embodiments, the infrared cut filter L9 may also be arranged on the object side of the first lens L1. In addition, in some embodiments, the infrared cut filter L9 may not be provided, but a filter coating is provided on any one of the first lens L1 to the eighth lens L8 to achieve the effect of filtering infrared light.
  • the first lens L1 may also include two or more lenses, wherein the object side surface of the lens closest to the object side is the object side surface S1 of the first lens L1, and the image side surface of the lens closest to the image side It is the image side surface S2 of the first lens L1. Accordingly, any one of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in some embodiments is not limited to only Include a lens.
  • the optical system 10 also satisfies the following relationships:
  • TTL/Imgh ⁇ 1.36; where TTL is the distance from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10 on the optical axis, and Imgh is the diagonal of the effective imaging area of the optical system 10 on the imaging surface S19 Half longer.
  • the TTL/Imgh in some embodiments is 1.290, 1.292, 1.295, 1.297, 1.299, or 1.30.
  • f is the effective focal length of the optical system 10
  • R16 is the radius of curvature of the image side surface S16 of the eighth lens L8 at the optical axis.
  • the f/R16 in some embodiments is 3.75, 3.78, 3.80, 3.82, 3.85, 3.87, or 3.89.
  • the optical system 10 has a large-aperture characteristic, which can increase the amount of light entering, make the captured image clearer, and furthermore can achieve high-quality shooting of scenes with low brightness such as night scenes and starry sky.
  • SD12/SD21 in some embodiments is 1.280, 1.283, 1.287, 1.290, 1.292, 1.295, 1.300, 1.305.
  • TTL/f 1.55; where TTL is the distance from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10 on the optical axis, and f is the effective focal length of the optical system 10.
  • the TTL/f in some embodiments is 1.58, 1.59, 1.60, or 1.61.
  • the tan(HFOV) in some embodiments is 1.242, 1.244, 1.245, 1.247, or 1.249. When the above relationship is satisfied, the optical system 10 can achieve small wide-angle characteristics.
  • T23/CT3 in some embodiments is 0.803, 0.806, 0.810, 0.812, 0.815, or 0.818.
  • the optical system 10 includes a first lens L1 with a negative refractive power, a second lens L2 with a positive refractive power, a stop STO, and a The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, The eighth lens L8 with negative refractive power. 2 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the first embodiment.
  • the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side surface S1 of the first lens L1 is concave at the paraxial position, and the image side surface S2 is convex at the paraxial position; the object side surface S1 is convex at the circumference, and the image side surface S2 is concave at the circumference.
  • the object side surface S3 of the second lens L2 is convex at the paraxial position, the image side surface S4 is concave at the paraxial position; the object side surface S3 is concave at the circumference, and the image side surface S4 is convex at the circumference.
  • the object side surface S5 of the third lens L3 is convex at the paraxial position, and the image side surface S6 is convex at the paraxial position; the object side surface S5 is concave at the circumference, and the image side surface S6 is convex at the circumference.
  • the object side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image side surface S8 is convex at the paraxial position; the object side surface S7 is convex at the circumference, and the image side surface S8 is concave at the circumference.
  • the object side surface S9 of the fifth lens L5 is concave at the paraxial position, the image side surface S10 is convex at the paraxial position; the object side surface S9 is convex at the circumference, and the image side surface S10 is concave at the circumference.
  • the object side surface S11 of the sixth lens L6 is concave at the paraxial position, the image side surface S12 is convex at the paraxial position; the object side surface S11 is convex at the circumference, and the image side surface S12 is concave at the circumference.
  • the object side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image side surface S14 is convex at the paraxial position; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
  • the object side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position; the object side surface S15 is concave at the circumference, and the image side surface S16 is convex at the circumference.
  • the second lens L2 by making the second lens L2 have a positive refractive power, the ability of the system to correct aberrations can be effectively improved, and the sensitivity of the system can be reduced.
  • the object side surface S3 of the second lens L2 By designing the object side surface S3 of the second lens L2 as a convex surface, the second lens L2 can bear more positive refractive power, and can effectively reduce the aberration of the entire system, reduce the system sensitivity, and improve the system yield. It is also conducive to the processing and assembly of subsequent structures.
  • the image side surface S6 of the third lens L3 is designed as a convex surface, which can effectively cooperate with the first lens L1 and the second lens L2 to reduce the system spherical aberration and improve the system aberration correction ability.
  • the object side surface S13 of the seventh lens L7 is designed as a convex surface, so that the seventh lens L7 can bear a reasonable positive refractive power to share part of the refractive power of the system and avoid excessive concentration of the positive refractive power on the second lens L2 and the third lens L3 .
  • further cooperating with the negative refractive power of the fourth lens L4 and the positive refractive power of the seventh lens L7 will facilitate the distribution of the refractive power of the entire system, avoid excessive concentration of refractive power, and also help balance the system's vertical chromatic aberration and lateral chromatic aberration. .
  • the above-mentioned optical system 10 can have excellent imaging quality by arranging the refractive power and the surface relationship of each lens well.
  • each of the first lens L1 to the eighth lens L8 are aspherical, and the object side surface S15 and the image side surface S16 of the eighth lens L8 both have inflection points.
  • the material of each lens in the optical system 10 is plastic.
  • the use of plastic lenses can reduce the manufacturing cost of the optical system 10.
  • the optical system 10 satisfies the following relationships:
  • TTL/Imgh 1.29; where TTL is the distance from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10 on the optical axis, and Imgh is the diagonal of the effective imaging area of the optical system 10 on the imaging surface S19 Half longer.
  • the optical system 10 can be designed to be miniaturized.
  • f/R16 3.89; where f is the effective focal length of the optical system 10, and R16 is the radius of curvature of the image side surface S16 of the eighth lens L8 at the optical axis.
  • the effective focal length of the optical system 10 and the radius of curvature of the image side surface S16 of the eighth lens L8 can be reasonably configured, which is beneficial to reduce the chief ray angle on the imaging surface S19 of the system and improve the sensitivity of the assembled photosensitive element. efficient.
  • FNO 1.85; where FNO is the aperture number of the optical system 10.
  • the FNO in some embodiments is 1.80, 1.82, 1.84, 1.86, or 1.88.
  • the optical system 10 has a large-aperture characteristic, which can increase the amount of light entering, make the captured image clearer, and furthermore can achieve high-quality shooting of scenes with low brightness such as night scenes and starry sky.
  • SD12/SD21 1.287; where SD12 is the maximum effective half diameter of the image side S2 of the first lens L1; SD21 is the maximum effective half diameter of the object side S3 of the second lens L2.
  • TTL/f 1.59; where TTL is the distance from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10 on the optical axis, and f is the effective focal length of the optical system 10.
  • TTL is the distance from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10 on the optical axis
  • f is the effective focal length of the optical system 10.
  • tan(HFOV) 1.25; where, HFOV is half of the maximum angle of view of the optical system 10.
  • T23/CT3 0.81; where T23 is the distance between the image side surface S4 of the second lens L2 and the object side surface S5 of the third lens L3 on the optical axis, and CT3 is the thickness of the third lens L3 on the optical axis.
  • lens parameters of the optical system 10 are given in Table 1 and Table 2.
  • Table 2 shows the aspheric coefficients of the lenses in Table 1, where K is the conic coefficient, and Ai is the coefficient corresponding to the higher order term of the i-th term in the aspheric formula.
  • the elements from the object surface to the image surface (imaging surface S19, which can also be understood as the photosensitive surface of the photosensitive element during later assembly) are arranged in the order of the elements in Table 1 from top to bottom. Among them, the subject located on the object surface The object can form a clear image on the imaging surface S19 of the optical system 10.
  • the surface numbers 1 and 2 respectively represent the object side S1 and the image side S2 of the first lens L1, that is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side.
  • the Y radius in Table 1 is the curvature radius of the object side or image side of the corresponding surface number on the optical axis.
  • the first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side of the lens to the object side of the latter optical element on the optical axis.
  • the optical axes of the lenses in the embodiments of the present application are on the same straight line, and the straight line serves as the optical axis of the optical system 10. It should be noted that, in the following embodiments, the infrared cut filter L9 may be used as an element in the optical system 10, or may not be used as an element in the optical system 10.
  • the refractive index, the Abbe number, and the reference wavelength of the focal length of each lens are all 555 nm.
  • the calculation of the relational expression and the lens structure of each embodiment are based on the lens parameters (such as Table 1, Table 2, Table 3, Table 4, etc.).
  • the optical system 10 includes a first lens L1 with a positive refractive power, a second lens L2 with a positive refractive power, a stop STO, and a The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, The eighth lens L8 with negative refractive power. 4 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the second embodiment.
  • the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
  • the object side surface S1 of the first lens L1 is concave at the paraxial position, and the image side surface S2 is convex at the paraxial position; the object side surface S1 is convex at the circumference, and the image side surface S2 is concave at the circumference.
  • the object side surface S3 of the second lens L2 is convex at the paraxial position, the image side surface S4 is concave at the paraxial position; the object side surface S3 is concave at the circumference, and the image side surface S4 is convex at the circumference.
  • the object side surface S5 of the third lens L3 is concave at the paraxial position, and the image side surface S6 is convex at the paraxial position; the object side surface S5 is concave at the circumference, and the image side surface S6 is convex at the circumference.
  • the object side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image side surface S8 is convex at the paraxial position; the object side surface S7 is convex at the circumference, and the image side surface S8 is concave at the circumference.
  • the object side surface S9 of the fifth lens L5 is concave at the paraxial position, the image side surface S10 is convex at the paraxial position; the object side surface S9 is convex at the circumference, and the image side surface S10 is concave at the circumference.
  • the object side surface S11 of the sixth lens L6 is concave at the paraxial position, the image side surface S12 is convex at the paraxial position; the object side surface S11 is concave at the circumference, and the image side surface S12 is convex at the circumference.
  • the object side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image side surface S14 is convex at the paraxial position; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
  • the object side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position; the object side surface S15 is concave at the circumference, and the image side surface S16 is convex at the circumference.
  • lens parameters of the optical system 10 in the second embodiment are given in Tables 3 and 4, and the definitions of the structures and parameters can be obtained in the first embodiment, which will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes a first lens L1 with a negative refractive power, a second lens L2 with a positive refractive power, a stop STO, and a The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, The eighth lens L8 with negative refractive power.
  • FIG. 6 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the third embodiment.
  • the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
  • the object side surface S1 of the first lens L1 is concave at the paraxial position, and the image side surface S2 is convex at the paraxial position; the object side surface S1 is convex at the circumference, and the image side surface S2 is concave at the circumference.
  • the object side surface S3 of the second lens L2 is convex at the paraxial position, the image side surface S4 is concave at the paraxial position; the object side surface S3 is concave at the circumference, and the image side surface S4 is convex at the circumference.
  • the object side surface S5 of the third lens L3 is convex at the paraxial position, and the image side surface S6 is convex at the paraxial position; the object side surface S5 is concave at the circumference, and the image side surface S6 is convex at the circumference.
  • the object side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image side surface S8 is convex at the paraxial position; the object side surface S7 is convex at the circumference, and the image side surface S8 is concave at the circumference.
  • the object side surface S9 of the fifth lens L5 is concave at the paraxial position, the image side surface S10 is convex at the paraxial position; the object side surface S9 is convex at the circumference, and the image side surface S10 is concave at the circumference.
  • the object side surface S11 of the sixth lens L6 is concave at the paraxial position, the image side surface S12 is convex at the paraxial position; the object side surface S11 is concave at the circumference, and the image side surface S12 is convex at the circumference.
  • the object side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image side surface S14 is convex at the paraxial position; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
  • the object side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position; the object side surface S15 is concave at the circumference, and the image side surface S16 is concave at the circumference.
  • lens parameters of the optical system 10 in the third embodiment are given in Table 5 and Table 6, wherein the definition of each structure and parameter can be obtained in the first embodiment, and will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes a first lens L1 with a negative refractive power, a second lens L2 with a positive refractive power, a stop STO, and a The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, The eighth lens L8 with negative refractive power.
  • FIG. 8 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fourth embodiment.
  • the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
  • the object side surface S1 of the first lens L1 is concave at the paraxial position, and the image side surface S2 is convex at the paraxial position; the object side surface S1 is convex at the circumference, and the image side surface S2 is concave at the circumference.
  • the object side surface S3 of the second lens L2 is convex at the paraxial position, the image side surface S4 is concave at the paraxial position; the object side surface S3 is concave at the circumference, and the image side surface S4 is convex at the circumference.
  • the object side surface S5 of the third lens L3 is convex at the paraxial position, and the image side surface S6 is convex at the paraxial position; the object side surface S5 is concave at the circumference, and the image side surface S6 is convex at the circumference.
  • the object side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image side surface S8 is convex at the paraxial position; the object side surface S7 is convex at the circumference, and the image side surface S8 is concave at the circumference.
  • the object side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image side surface S10 is convex at the paraxial position; the object side surface S9 is convex at the circumference, and the image side surface S10 is concave at the circumference.
  • the object side surface S11 of the sixth lens L6 is concave at the paraxial position, the image side surface S12 is convex at the paraxial position; the object side surface S11 is concave at the circumference, and the image side surface S12 is convex at the circumference.
  • the object side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image side surface S14 is concave at the paraxial position; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
  • the object side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position; the object side surface S15 is convex at the circumference, and the image side surface S16 is concave at the circumference.
  • lens parameters of the optical system 10 in the fourth embodiment are given in Table 7 and Table 8.
  • the definition of each structure and parameter can be obtained in the first embodiment, and will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes a first lens L1 with a negative refractive power, a second lens L2 with a positive refractive power, a stop STO, and a The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, The eighth lens L8 with negative refractive power.
  • FIG. 10 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fifth embodiment.
  • the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
  • the object side surface S1 of the first lens L1 is concave at the paraxial position, and the image side surface S2 is convex at the paraxial position; the object side surface S1 is convex at the circumference, and the image side surface S2 is concave at the circumference.
  • the object side surface S3 of the second lens L2 is convex at the paraxial position, the image side surface S4 is concave at the paraxial position; the object side surface S3 is concave at the circumference, and the image side surface S4 is convex at the circumference.
  • the object side surface S5 of the third lens L3 is convex at the paraxial position, and the image side surface S6 is convex at the paraxial position; the object side surface S5 is concave at the circumference, and the image side surface S6 is convex at the circumference.
  • the object side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image side surface S8 is convex at the paraxial position; the object side surface S7 is concave at the circumference, and the image side surface S8 is concave at the circumference.
  • the object side surface S9 of the fifth lens L5 is concave at the paraxial position, the image side surface S10 is concave at the paraxial position; the object side surface S9 is convex at the circumference, and the image side surface S10 is concave at the circumference.
  • the object side surface S11 of the sixth lens L6 is concave at the paraxial position, the image side surface S12 is convex at the paraxial position; the object side surface S11 is concave at the circumference, and the image side surface S12 is convex at the circumference.
  • the object side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image side surface S14 is convex at the paraxial position; the object side surface S13 is concave at the circumference, and the image side surface S14 is convex at the circumference.
  • the object side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position; the object side surface S15 is convex at the circumference, and the image side surface S16 is concave at the circumference.
  • lens parameters of the optical system 10 in the fifth embodiment are given in Table 9 and Table 10, and the definition of each structure and parameter can be obtained in the first embodiment, and will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a stop STO, and a The third lens L3 with positive refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with positive refractive power, the sixth lens L6 with negative refractive power, the seventh lens L7 with positive refractive power, The eighth lens L8 with negative refractive power.
  • FIG. 12 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the sixth embodiment.
  • the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
  • the object side surface S1 of the first lens L1 is concave at the paraxial position, and the image side surface S2 is convex at the paraxial position; the object side surface S1 is convex at the circumference, and the image side surface S2 is concave at the circumference.
  • the object side surface S3 of the second lens L2 is convex at the paraxial position, the image side surface S4 is concave at the paraxial position; the object side surface S3 is concave at the circumference, and the image side surface S4 is convex at the circumference.
  • the object side surface S5 of the third lens L3 is convex at the paraxial position, and the image side surface S6 is convex at the paraxial position; the object side surface S5 is concave at the circumference, and the image side surface S6 is convex at the circumference.
  • the object side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image side surface S8 is concave at the paraxial position; the object side surface S7 is concave at the circumference, and the image side surface S8 is concave at the circumference.
  • the object side surface S9 of the fifth lens L5 is concave at the paraxial position, the image side surface S10 is convex at the paraxial position; the object side surface S9 is convex at the circumference, and the image side surface S10 is concave at the circumference.
  • the object side surface S11 of the sixth lens L6 is concave at the paraxial position, the image side surface S12 is convex at the paraxial position; the object side surface S11 is concave at the circumference, and the image side surface S12 is convex at the circumference.
  • the object side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image side surface S14 is convex at the paraxial position; the object side surface S13 is concave at the circumference, and the image side surface S14 is convex at the circumference.
  • the object side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image side surface S16 is concave at the paraxial position; the object side surface S15 is convex at the circumference, and the image side surface S16 is concave at the circumference.
  • lens parameters of the optical system 10 in the sixth embodiment are given in Table 11 and Table 12.
  • the definition of each structure and parameter can be obtained in the first embodiment, and will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 and the photosensitive element 210 are assembled to form the camera module 20.
  • the photosensitive element 210 is disposed on the image side of the eighth lens L8, that is, the image disposed on the optical system 10 side. Generally, the photosensitive surface of the photosensitive element 210 overlaps with the imaging surface S19 of the optical system 10.
  • An infrared cut filter L9 is also provided between the eighth lens L8 and the photosensitive element 210 in this embodiment.
  • the photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor).
  • the distance between the photosensitive element 210 and each lens in the optical system 10 is relatively fixed.
  • the camera module 20 is a fixed focus module.
  • a driving mechanism such as a voice coil motor can be provided to enable the photosensitive element 210 to move relative to each lens in the optical system 10, thereby achieving a focusing effect.
  • a coil electrically connected to the drive chip is provided on the lens barrel equipped with the above-mentioned lenses, and the camera module 20 is also provided with a magnet. The magnetic force between the energized coil and the magnet is used to drive the lens barrel to oppose each other.
  • the photosensitive element 210 moves to achieve a focusing effect.
  • a similar driving mechanism can also be provided to drive part of the lens in the optical system 10 to move, so as to achieve an optical zoom effect.
  • some embodiments of the present application further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30 so that the electronic device 30 has a camera function.
  • the electronic device 30 includes a fixing member 310, and the camera module 20 is mounted on the fixing member 310.
  • the fixing member 310 may be a circuit board, a middle frame, or other components.
  • the electronic device 30 can be, but is not limited to, a smart phone, a smart watch, an e-book reader, a vehicle-mounted camera device, a monitoring device, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a fingerprint recognition device or a pupil recognition device) Etc.), PDA (Personal Digital Assistant), drone, etc.
  • the electronic device 30 is a smart phone.
  • the smart phone includes a middle frame and a circuit board.
  • the circuit board is disposed in the middle frame.
  • the camera module 20 is installed in the middle frame of the smart phone, and the photosensitive element 210 therein is Electrically connected with the circuit board.
  • the camera module 20 can be used as a front camera module or a rear camera module of a smart phone. By adopting the camera module 20 provided by the embodiment of the present application, the electronic device 30 can have an excellent shooting function.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include at least one of the features. In the description of the present invention, “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise specified The limit.
  • installed can be a fixed connection or a detachable connection. , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise specified The limit.
  • the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.
  • the “on” or “under” of the first feature on the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. touch.
  • the “above”, “above” and “above” of the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or it simply means that the level of the first feature is higher than that of the second feature.
  • the “below”, “below” and “below” of the second feature of the first feature may mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

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Abstract

一种光学系统(10)，由物侧至像侧依次包括：第一透镜(L1)，物侧面(S1)于近轴处为凹面，像侧面(S2)于近轴处为凸面；具有正屈折力的第二透镜(L2)，物侧面(S3)于近轴处为凸面，像侧面(S4)于近轴处为凹面；具有正屈折力的第三透镜(L3)，像侧面(S6)于近轴处为凸面；具有负屈折力的第四透镜(L4)，物侧面(S7)于近轴处为凹面；第五透镜(L5)；具有负屈折力的第六透镜(L6)，物侧面(S11)于近轴处为凹面；具有正屈折力的第七透镜(L7)，物侧面(S13)于近轴处为凸面；及具有负屈折力的第八透镜(L8)，物侧面(S15)于近轴处为凸面，像侧面(S16)于近轴处为凹面。

Description

光学系统、摄像模组及电子装置 技术领域
本发明涉及摄像领域，特别是涉及一种光学系统、摄像模组及电子装置。
背景技术
近年来，随着摄像头应用至智能手机等便携式电子装置以来，摄像头的性能也随着用户对摄像品质需求的提高而发生翻天覆地的变化。理论上，通过配置多个透镜能够使系统有更多的空间和自由度去调整入射光路，这是提高光学系统成像质量最高效的方法之一。但如何良好地配置光学系统中各透镜的性能以确保系统的高摄像品质，是目前镜头设计的主要关注点之一。
发明内容
根据本申请的各种实施例，提供一种光学系统。
一种光学系统，由物侧至像侧依次包括：
具有屈折力的第一透镜，所述第一透镜的物侧面于近轴处为凹面，像侧面于近轴处为凸面；
具有正屈折力的第二透镜，所述第二透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面；
具有正屈折力的第三透镜，所述第三透镜的像侧面于近轴处为凸面；
具有负屈折力的第四透镜，所述第四透镜的物侧面于近轴处为凹面；
具有屈折力的第五透镜；
具有负屈折力的第六透镜，所述第六透镜的物侧面于近轴处为凹面；
具有正屈折力的第七透镜，所述第七透镜的物侧面于近轴处为凸面；及
具有负屈折力的第八透镜，所述第八透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面。
一种摄像模组，包括感光元件及上述的光学系统，所述感光元件设置于所述光学系统的像侧。
一种电子装置，包括固定件及上述的摄像模组，所述摄像模组设置于所述固定件。
本发明的一个或多个实施例的细节在下面的附图和描述中提出。本发明的其它特征、目的和优点将从说明书、附图以及权利要求书变得明显。
附图说明
为了更好地描述和说明这里公开的那些发明的实施例和/或示例，可以参考一幅或多幅附图。用于描述附图的附加细节或示例不应当被认为是对所公开的发明、目前描述的实施例和/或示例以及目前理解的这些发明的最佳模式中的任何一者的范围的限制。
图1为本申请第一实施例提供的光学系统的示意图；
图2为第一实施例中光学系统的纵向球差图(mm)、像散图(mm)和畸变图(％)；
图3为本申请第二实施例提供的光学系统的示意图；
图4为第二实施例中光学系统的纵向球差图(mm)、像散图(mm)和畸变图(％)；
图5为本申请第三实施例提供的光学系统的示意图；
图6为第三实施例中光学系统的纵向球差图(mm)、像散图(mm)和畸变图(％)；
图7为本申请第四实施例提供的光学系统的示意图；
图8为第四实施例中光学系统的纵向球差图(mm)、像散图(mm)和畸变图(％)；
图9为本申请第五实施例提供的光学系统的示意图；
图10为第五实施例中光学系统的纵向球差图(mm)、像散图(mm)和畸变图(％)；
图11为本申请第六实施例提供的光学系统的示意图；
图12为第六实施例中光学系统的纵向球差图(mm)、像散图(mm)和畸变图(％)；
图13为本申请一实施例提供的摄像模组的示意图；
图14为本申请一实施例提供的电子装置的示意图。
具体实施方式
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施方式。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本发明的公开内容理解的更加透彻全面。
参考图1，在本申请的一些实施例中，光学系统10由物侧至像侧依次包括第一透镜L1、第二透镜L2、光阑STO、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7及第八透镜L8。其中，第一透镜L1具有正屈折力或负屈折力，第二透镜L2具有正屈折力，第三透镜L3具有正屈折力，第四透镜L4具有负屈折力，第五透镜L5具有正屈折力或负屈折力、第六透镜L6具有负屈折力、第七透镜L7具有正屈折力、第八透镜L8具有负屈折力。第一透镜L1至第八透镜L8分别只含有一个透镜，且光学系统10中各透镜与光阑STO同轴设置，即各透镜的光轴与光阑STO的中心均位于同一直线上，该直线可称为光学系统10的光轴。
第一透镜L1包括物侧面S1和像侧面S2，第二透镜L2包括物侧面S3和像侧面S4，第三透镜L3包括物侧面S5和像侧面S6，第四透镜L4包括物侧面S7和像侧面S8，第五透镜L5包括物侧面S9及像侧面S10，第六透镜包括物侧面S11和像侧面S12，第七透镜包括物侧面S13和像侧面S14，第八透镜包括物侧面S15和像侧面S16。另外，光学系统10还有一成像面S19，成像面S19位于第八透镜的像侧。一般地，光学系统10的成像面S19与感光元件的感光表面重合，为方便理解，可将成像面S19视为感光元件的感光表面。
在上述实施例中，第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；第三透镜L3的像侧面S6于近轴处为凸面；第四透镜L4的物侧面S7于近轴处为凹面；第六透镜的物侧面S11于近轴处为凹面；第七透镜的物侧面S13于近轴处为凸面；第八透镜的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面。
在上述光学系统10中，通过使第二透镜L2具有正屈折力，可有效提高系统矫正像差的能力，并可降低系统的敏感性。通过将第二透镜L2的物侧面S3设计为凸面，可使第二透镜L2承担更多的正屈折力，并可有效减小整个系统的像差，降低系统敏感度，提高系统良率，同时也有利于后续结构的加工和组装。将第三透镜L3的像侧面S6设计为凸面，可有效配合第一透镜L1和第二透镜L2以降低系统球差并提高系统像差矫正能力。将第七透镜L7的物侧面S13设计为凸面，可使第七透镜L7承担合理的正屈折力，以分担系统的部分屈折力，避免正屈折力过度集中于第二透镜L2和第三透镜L3。另外，进一步配合第四透镜L4的负屈折力和第七透镜L7的正屈折力将有利于整个系统的屈折力分配、避免屈折力过度集中，同时还有助于平衡系统垂轴色差和横向色差。上述光学系统10通过良好地配置各透镜的屈折力及面型关系从而能够拥有优良的摄像品质。
在上述实施例中，第一透镜L1至第八透镜L8的物侧面及像侧面均为非球面，且第八透镜L8的物侧面S15和像侧面S16均存在反曲点。非球面的面型设置能够进一步帮助光学系统10消除像差，解决视界歪曲的问题，同时还有利于光学系统10的小型化设计，使光学系统10能够在保持小型化设计的前提下同时具备优良的光学效果。当然，在另一些实施例中，第一透镜L1至第八透镜L8中任意一个的物侧面可以是球面，也可以是非球面；第一透镜L1至第八透镜L8中任意一个的像侧面可以是球面，也可以是非球面，通过球面与非球面的配合也可有效消除像差问题，使光学系统10具有优良的成像效果，同时提高镜片设计及组装的灵活性。特别地，当第八透镜L8为非球面透镜时将有利于对前方各透镜所产生的像差进行最终校正，从而有利于改善成像品质。需注意的是，球面或非球面的形状并不限于附图中示出的球面或非球面的形状。附图仅为示例参考而非严格按比例绘制。
非球面的面型计算可参考非球面公式：
Figure PCTCN2020079517-appb-000001
其中，Z为非球面上相应点到与表面顶点相切的平面的距离，r为非球面上相应点到光轴的距离，c为非球面顶点的曲率，k为圆锥系数，Ai为非球面面型公式中与第i项高次项相对应的系数。
另一方面，在一些实施例中，当某个透镜的物侧面或像侧面为非球面时，该面可以是整体凸面或整体呈现凹面的结构；或者该面也可设计成存在反曲点的结构，此时该面由中心至边缘的面型将发生改变，例如该面于中心处呈凸面而于边缘处呈凹面。需要注意的是，当本申请的实施例在描述透镜的一个侧面于光轴处(该侧面的中心区域)为凸面时，可理解为该透镜的该侧面于光轴附近的区域为凸面，因此也可认为该侧面于近轴处为凸面；当描述透镜的一个侧面于圆周处为凹面时，可理解为该侧面在靠近最大有效半孔径处的区域为凹面。举例而言，当该侧面于近轴处为凸面，且于圆周处也为凸面时，该侧面由中心(光轴)至边缘方向的形状可以为纯粹的凸面；或者是先由中心的凸面形状过渡到凹面形状，随后在靠近最大有效半孔径处时变为凸面。此处仅为说明光轴处与圆周处的关系而做出的示例，侧面的多种形状结构(凹凸关系)并未完全体现，但其他情况可根据以上示例推导得出，也应视为是本申请所记载的内容。
在上述实施例中，光学系统10中各透镜的材质均为塑料。当然，在一些实施例中，光学系统10中各透镜的材质均为玻璃。塑料材质的透镜能够减少光学系统10的重量并降低生产成本，而玻璃材质的透镜能够耐受较高的温度且具有优良的光学效果。在另一些实施例中，第一透镜L1的材质为玻璃，而第二透镜L2至第八透镜L8的材质均为塑料，此时，由于光学系统10中位于物方的透镜的材质为玻璃，因此这些位于物方的玻璃透镜对极端环境具有很好耐受效果，不易受物方环境的影响而出现老化等情况，从而当光学系统10处于暴晒高温等极端环境下时，这种结构能够较好地平衡系统的光学性能与成本。当然，光学系统10中透镜材质配置关系并不限于上述实施例，任一透镜的材质可以为塑料，也可以为玻璃。
在一些实施例中，光学系统10包括红外截止滤光片L9，红外截止滤光片L9设置于第八透镜L8的像侧，并与光学系统10中的各透镜相对固定设置。红外截止滤光片L9包括物侧面S17和像侧面S18。红外截止滤光片L9用于滤除红外光，防止红外光到达系统的成像面S19，从而防止红外光干扰正常成像。红外截止滤光片L9可与各透镜一同装配以作为光学系统10中的一部分。在另一些实施例中，红外截止滤光片L9并不属于光学系统10的元件，此时红外截止滤光片L9可以在光学系统10与感光元件装配成摄像模组时，一并安装至光学系统10与感光元件之间。在一些实施例中，红外截止滤光片L9也可设置在第一透镜L1的物侧。另外，在一些实施例中也可不设置红外截止滤光片L9，而是通过在第一透镜L1至第八透镜L8中的任一透镜上设置滤光镀层以实现滤除红外光的作用。
在另一些实施例中，第一透镜L1也可以包含两个或多个透镜，其中最靠近物侧的透镜的物侧面为第一透镜L1的物侧面S1，最靠近像侧的透镜的像侧面为第一透镜L1的像侧面S2。相应地，一些实施例中的第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7及第八透镜L8中的任一个并不限于只包含一个透镜的情况。
在一些实施例中，光学系统10还满足以下各关系：
TTL/Imgh＜1.36；其中，TTL为第一透镜L1的物侧面S1至光学系统10的成像面S19于光轴上的距离，Imgh为光学系统10于成像面S19上有效成像区域的对角线长的一半。一些实施例中的TTL/Imgh为1.290、1.292、1.295、1.297、1.299或1.30。满足上述关系时，光学系统10能够实现小型化设计。
2＜f/R16＜4；其中，f为光学系统10的有效焦距，R16为第八透镜L8的像侧面S16于光轴处的曲率半径。一些实施例中的f/R16为3.75、3.78、3.80、3.82、3.85、3.87或3.89。满足上述关系时，光学系统10的有效焦距与第八透镜L8的像侧面S16的曲率半径能够得到合理配置，从而有利于降低系统成像面S19上的主光线角度，提升装配后的感光元件的感光效率。
FNO≤2；其中，FNO为光学系统10的光圈数。一些实施例中的FNO为1.80、1.82、1.84、1.86或1.88。满足上述关系时，光学系统10具有大口径特性，从而能够提高进光量，使得拍摄的图像更加清晰，进而还能对夜景、星空等光亮度低的场景实现高质量拍摄。
1＜SD12/SD21＜1.4；其中，SD12为第一透镜L1的像侧面S2的最大有效半口径；SD21为第二透镜L2的物侧面S3的最大有效半口径。一些实施例中的SD12/SD21为1.280、1.283、1.287、1.290、 1.292、1.295、1.300、1.305。满足上述关系时，可有效缩小光学系统10的前端尺寸。
TTL/f＜1.65；其中，TTL为第一透镜L1的物侧面S1至光学系统10的成像面S19于光轴上的距离，f为光学系统10有效焦距。一些实施例中的TTL/f为1.58、1.59、1.60或1.61。满足上述关系时，光学系统10能够满足小型化设计的要求。
tan(HFOV)＞1.09；其中，HFOV为光学系统10的最大视场角的一半。一些实施例中的tan(HFOV)为1.242、1.244、1.245、1.247或1.249。满足上述关系时，光学系统10能够实现小广角特性。
0＜T23/CT3＜0.9；其中，T23为第二透镜L2的像侧面S4至第三透镜L3的物侧面S5于光轴上的距离，CT3为第三透镜L3于光轴上的厚度。一些实施例中的T23/CT3为0.803、0.806、0.810、0.812、0.815或0.818。满足上述关系时，有利于减小光线于系统中的偏折角度，从而可有效降低系统敏感性。
接下来以更为具体详细的实施例来对本申请的光学系统10进行说明：
第一实施例
参考图1和图2，在第一实施例中，光学系统10由物侧至像侧依次包括具有负屈折力的第一透镜L1、具有正屈折力的第二透镜L2、光阑STO、具有正屈折力的第三透镜L3、具有负屈折力的第四透镜L4、具有正屈折力的第五透镜L5、具有负屈折力的第六透镜L6、具有正屈折力的第七透镜L7、具有负屈折力的第八透镜L8。图2包括第一实施例中光学系统10的纵向球差图(mm)、像散图(mm)和畸变图(％)，其中的像散图和畸变图的参考波长为555nm。
第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凹面。
第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；物侧面S3于圆周处为凹面，像侧面S4于圆周处为凸面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凸面；物侧面S5于圆周处为凹面，像侧面S6于圆周处为凸面。
第四透镜L4的物侧面S7于近轴处为凹面，像侧面S8于近轴处为凸面；物侧面S7于圆周处为凸面，像侧面S8于圆周处为凹面。
第五透镜L5的物侧面S9于近轴处为凹面，像侧面S10于近轴处为凸面；物侧面S9于圆周处为凸面，像侧面S10于圆周处为凹面。
第六透镜L6的物侧面S11于近轴处为凹面，像侧面S12于近轴处为凸面；物侧面S11于圆周处为凸面，像侧面S12于圆周处为凹面。
第七透镜L7的物侧面S13于近轴处为凸面，像侧面S14于近轴处为凸面；物侧面S13于圆周处为凸面，像侧面S14于圆周处为凸面。
第八透镜L8的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面；物侧面S15于圆周处为凹面，像侧面S16于圆周处为凸面。
在上述光学系统10中，通过使第二透镜L2具有正屈折力，可有效提高系统矫正像差的能力，并可降低系统的敏感性。通过将第二透镜L2的物侧面S3设计为凸面，可使第二透镜L2承担更多的正屈折力，并可有效减小整个系统的像差，降低系统敏感度，提高系统良率，同时也有利于后续结构的加工和组装。将第三透镜L3的像侧面S6设计为凸面，可有效配合第一透镜L1和第二透镜L2以降低系统球差并提高系统像差矫正能力。将第七透镜L7的物侧面S13设计为凸面，可使第七透镜L7承担合理的正屈折力，以分担系统的部分屈折力，避免正屈折力过度集中于第二透镜L2和第三透镜L3。另外，进一步配合第四透镜L4的负屈折力和第七透镜L7的正屈折力将有利于整个系统的屈折力分配、避免屈折力过度集中，同时还有助于平衡系统垂轴色差和横向色差。上述光学系统10通过良好地配置各透镜的屈折力及面型关系从而能够拥有优良的摄像品质。
第一透镜L1至第八透镜L8中各透镜的物侧面和像侧面均为非球面，且第八透镜L8的物侧面S15和像侧面S16均存在反曲点。通过配合光学系统10中各透镜的非球面面型，从而能够有效解决光学系统10视界歪曲的问题，也能够使透镜在较小、较薄的情况下实现优良的光学效果，进而使光学系统10 具有更小的体积，有利于光学系统10实现小型化设计。
光学系统10中各透镜的材质均为塑料。塑料透镜的采用能够降低光学系统10的制造成本。
在第一实施例中，光学系统10满足以下各关系：
TTL/Imgh＝1.29；其中，TTL为第一透镜L1的物侧面S1至光学系统10的成像面S19于光轴上的距离，Imgh为光学系统10于成像面S19上有效成像区域的对角线长的一半。满足上述关系时，光学系统10能够实现小型化设计。
f/R16＝3.89；其中，f为光学系统10的有效焦距，R16为第八透镜L8的像侧面S16于光轴处的曲率半径。满足上述关系时，光学系统10的有效焦距与第八透镜L8的像侧面S16的曲率半径能够得到合理配置，从而有利于降低系统成像面S19上的主光线角度，提升装配后的感光元件的感光效率。
FNO＝1.85；其中，FNO为光学系统10的光圈数。一些实施例中的FNO为1.80、1.82、1.84、1.86或1.88。满足上述关系时，光学系统10具有大口径特性，从而能够提高进光量，使得拍摄的图像更加清晰，进而还能对夜景、星空等光亮度低的场景实现高质量拍摄。
SD12/SD21＝1.287；其中，SD12为第一透镜L1的像侧面S2的最大有效半口径；SD21为第二透镜L2的物侧面S3的最大有效半口径。满足上述关系时，可有效缩小光学系统10的前端尺寸。
TTL/f＝1.59；其中，TTL为第一透镜L1的物侧面S1至光学系统10的成像面S19于光轴上的距离，f为光学系统10有效焦距。满足上述关系时，光学系统10能够满足小型化设计的要求。
tan(HFOV)＝1.25；其中，HFOV为光学系统10的最大视场角的一半。满足上述关系时，光学系统10拥有小广角特性。
T23/CT3＝0.81；其中，T23为第二透镜L2的像侧面S4与第三透镜L3的物侧面S5于光轴上的距离，CT3为第三透镜L3于光轴上的厚度。满足上述关系时，有利于减小光线于系统中的偏折角度，从而可有效降低系统敏感性。
另外，光学系统10的各透镜参数由表1和表2给出。表2为表1中各透镜的非球面系数，其中K为圆锥系数，Ai为非球面面型公式中与第i项高次项相对应的系数。由物面至像面(成像面S19，也可理解为后期装配时感光元件的感光表面)的各元件依次按照表1从上至下的各元件的顺序排列，其中，位于物面的被摄物能够于光学系统10的成像面S19上形成清晰的成像。面序号1和2分别表示第一透镜L1的物侧面S1和像侧面S2，即同一透镜中，面序号较小的表面为物侧面，面序号较大的表面为像侧面。表1中的Y半径为相应面序号的物侧面或像侧面于光轴上的曲率半径。透镜于“厚度”参数列中的第一个数值为该透镜于光轴上的厚度，第二个数值为该透镜的像侧面至后一光学元件的物侧面于光轴上的距离。本申请实施例中的各透镜的光轴处于同一直线上，该直线作为光学系统10的光轴。需注意的是，以下各实施例中，红外截止滤光片L9可以作为光学系统10中的元件，也可以不作为光学系统10中的元件。
在第一实施例中，光学系统10的有效焦距f＝4.38mm，光圈数FNO＝1.85，最大视场角(即对角线方向视角)FOV＝102.9°，光学总长TTL＝6.95mm。
另外，在以下各实施例(第一实施例至第六实施例)的参数表格中，各透镜的折射率、阿贝数和焦距的参考波长均为555nm。另外，各实施例的关系式计算和透镜结构以透镜参数(如表1、表2、表3、表4等)为准。
表1
Figure PCTCN2020079517-appb-000002
Figure PCTCN2020079517-appb-000003
表2
面序号 1 2 3 4 5 6 7 8
K -1.5111 -6.1427 -13.8745 -7.6187 3.3628 -1.8636 -0.3653 -8.2092
A4 0.0363 0.0365 0.1187 -0.0257 -0.0172 -0.0482 -0.0598 -0.0214
A6 -0.0099 -0.0132 -0.1125 0.0157 -0.0079 -0.0336 -0.0601 0.0073
A8 0.0039 0.0088 0.1082 -0.0118 0.0045 0.0588 0.0870 -0.0391
A10 -0.0010 -0.0035 -0.0772 0.0037 -0.0134 -0.0603 -0.0762 0.0304
A12 0.0002 0.0009 0.0365 0.0003 0.0122 0.0330 0.0405 -0.0091
A14 0.0000 -0.0001 -0.0100 -0.0011 -0.0067 -0.0097 -0.0110 0.0010
A16 0.0000 0.0000 0.0011 0.0003 0.0011 0.0011 0.0012 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
面序号 9 10 11 12 13 14 15 16
K 2.5029 -9.5128 -22.7856 -27.6029 -6.9216 -23.6470 -3.8168 -3.0788
A4 -0.0431 -0.0223 -0.0077 -0.1574 0.0305 0.1982 -0.1119 -0.0733
A6 0.0754 0.0216 0.0475 0.1096 -0.0041 -0.1121 0.0258 0.0226
A8 -0.1436 -0.0467 -0.0498 -0.0496 -0.0100 0.0346 -0.0040 -0.0052
A10 0.1203 0.0395 0.0266 0.0152 0.0049 -0.0071 0.0006 0.0008
A12 -0.0517 -0.0167 -0.0084 -0.0029 -0.0011 0.0010 -0.0001 -0.0001
A14 0.0113 0.0034 0.0016 0.0003 0.0001 -0.0001 0.0000 0.0000
A16 -0.0010 -0.0003 -0.0002 0.0000 0.0000 0.0000 0.0000 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
第二实施例
参考图3和图4，在第二实施例中，光学系统10由物侧至像侧依次包括具有正屈折力的第一透镜L1、具有正屈折力的第二透镜L2、光阑STO、具有正屈折力的第三透镜L3、具有负屈折力的第四透镜L4、具有负屈折力的第五透镜L5、具有负屈折力的第六透镜L6、具有正屈折力的第七透镜L7、具有负屈折力的第八透镜L8。图4括第二实施例中光学系统10的纵向球差图(mm)、像散图(mm)和畸变图(％)，其中的像散图和畸变图为555nm波长下的曲线图。
第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凹面。
第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；物侧面S3于圆周处为凹面，像侧面S4于圆周处为凸面。
第三透镜L3的物侧面S5于近轴处为凹面，像侧面S6于近轴处为凸面；物侧面S5于圆周处为凹面，像侧面S6于圆周处为凸面。
第四透镜L4的物侧面S7于近轴处为凹面，像侧面S8于近轴处为凸面；物侧面S7于圆周处为凸面，像侧面S8于圆周处为凹面。
第五透镜L5的物侧面S9于近轴处为凹面，像侧面S10于近轴处为凸面；物侧面S9于圆周处为凸面，像侧面S10于圆周处为凹面。
第六透镜L6的物侧面S11于近轴处为凹面，像侧面S12于近轴处为凸面；物侧面S11于圆周处为凹面，像侧面S12于圆周处为凸面。
第七透镜L7的物侧面S13于近轴处为凸面，像侧面S14于近轴处为凸面；物侧面S13于圆周处为凸面，像侧面S14于圆周处为凸面。
第八透镜L8的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面；物侧面S15于圆周处为凹面，像侧面S16于圆周处为凸面。
另外，第二实施例中光学系统10的各透镜参数由表3和表4给出，其中各结构和参数的定义可由第一实施例中得出，此处不加以赘述。
表3
Figure PCTCN2020079517-appb-000004
Figure PCTCN2020079517-appb-000005
表4
面序号 1 2 3 4 5 6 7 8
K -1.1501 -5.1201 -13.5050 -8.2433 10.0000 -2.1535 -0.2855 7.0696
A4 0.0291 0.0345 0.1131 -0.0254 -0.0191 -0.0469 -0.0623 -0.0077
A6 -0.0061 -0.0135 -0.1010 0.0145 -0.0061 -0.0223 -0.0200 -0.0487
A8 0.0022 0.0094 0.0951 -0.0113 0.0003 0.0351 0.0087 0.0374
A10 -0.0005 -0.0041 -0.0682 0.0051 -0.0095 -0.0399 -0.0156 -0.0237
A12 0.0001 0.0012 0.0332 -0.0020 0.0103 0.0235 0.0175 0.0119
A14 0.0000 -0.0002 -0.0095 0.0001 -0.0067 -0.0076 -0.0066 -0.0032
A16 0.0000 0.0000 0.0011 0.0001 0.0013 0.0010 0.0008 0.0004
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
面序号 9 10 11 12 13 14 15 16
K 5.8084 -6.8313 -25.6596 -22.7983 -8.2157 -23.6470 -3.7493 -3.2138
A4 -0.0005 0.0128 0.0101 -0.1639 0.0354 0.1989 -0.1039 -0.0652
A6 -0.1006 -0.0674 0.0217 0.1143 -0.0057 -0.1095 0.0225 0.0187
A8 0.0964 0.0456 -0.0307 -0.0512 -0.0088 0.0329 -0.0033 -0.0041
A10 -0.0400 -0.0095 0.0182 0.0154 0.0043 -0.0066 0.0005 0.0006
A12 0.0057 -0.0026 -0.0061 -0.0028 -0.0010 0.0009 -0.0001 -0.0001
A14 0.0006 0.0014 0.0012 0.0003 0.0001 -0.0001 0.0000 0.0000
A16 -0.0002 -0.0002 -0.0001 0.0000 0.0000 0.0000 0.0000 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
该实施例中的光学系统10满足以下关系：
Figure PCTCN2020079517-appb-000006
第三实施例
参考图5和图6，在第三实施例中，光学系统10由物侧至像侧依次包括具有负屈折力的第一透镜L1、具有正屈折力的第二透镜L2、光阑STO、具有正屈折力的第三透镜L3、具有负屈折力的第四透镜L4、具有正屈折力的第五透镜L5、具有负屈折力的第六透镜L6、具有正屈折力的第七透镜L7、具有负屈折力的第八透镜L8。图6包括第三实施例中光学系统10的纵向球差图(mm)、像散图(mm)和畸变图(％)，其中的像散图和畸变图为555nm波长下的曲线图。
第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凹面。
第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；物侧面S3于圆周处为凹 面，像侧面S4于圆周处为凸面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凸面；物侧面S5于圆周处为凹面，像侧面S6于圆周处为凸面。
第四透镜L4的物侧面S7于近轴处为凹面，像侧面S8于近轴处为凸面；物侧面S7于圆周处为凸面，像侧面S8于圆周处为凹面。
第五透镜L5的物侧面S9于近轴处为凹面，像侧面S10于近轴处为凸面；物侧面S9于圆周处为凸面，像侧面S10于圆周处为凹面。
第六透镜L6的物侧面S11于近轴处为凹面，像侧面S12于近轴处为凸面；物侧面S11于圆周处为凹面，像侧面S12于圆周处为凸面。
第七透镜L7的物侧面S13于近轴处为凸面，像侧面S14于近轴处为凸面；物侧面S13于圆周处为凸面，像侧面S14于圆周处为凸面。
第八透镜L8的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面；物侧面S15于圆周处为凹面，像侧面S16于圆周处为凹面。
另外，第三实施例中光学系统10的各透镜参数由表5和表6给出，其中各结构和参数的定义可由第一实施例中得出，此处不加以赘述。
表5
Figure PCTCN2020079517-appb-000007
表6
面序号 1 2 3 4 5 6 7 8
K -1.4003 -6.3932 -13.6476 -7.8716 10.0000 -3.2982 -0.9043 -3.2739
A4 0.0359 0.0359 0.1139 -0.0260 -0.0186 -0.0437 -0.0534 -0.0285
A6 -0.0098 -0.0115 -0.1081 0.0183 -0.0021 -0.0269 -0.0211 0.0027
A8 0.0037 0.0069 0.1060 -0.0190 -0.0071 0.0405 0.0216 -0.0089
A10 -0.0010 -0.0024 -0.0776 0.0136 0.0028 -0.0413 -0.0393 -0.0012
A12 0.0002 0.0005 0.0373 -0.0071 -0.0002 0.0226 0.0356 0.0056
A14 0.0000 -0.0001 -0.0102 0.0018 -0.0016 -0.0066 -0.0133 -0.0023
A16 0.0000 0.0000 0.0011 -0.0002 0.0004 0.0007 0.0018 0.0003
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
面序号 9 10 11 12 13 14 15 16
K 6.6844 -12.4040 -27.6114 -27.8830 -6.8018 -23.6470 -3.9038 -3.0265
A4 -0.0230 0.0195 0.0142 -0.1737 0.0271 0.1997 -0.0980 -0.0673
A6 -0.0434 -0.0538 0.0303 0.1229 0.0022 -0.1084 0.0194 0.0191
A8 0.0284 0.0115 -0.0417 -0.0541 -0.0128 0.0319 -0.0025 -0.0041
A10 0.0049 0.0173 0.0237 0.0152 0.0055 -0.0062 0.0004 0.0006
A12 -0.0105 -0.0125 -0.0075 -0.0025 -0.0012 0.0008 0.0000 -0.0001
A14 0.0036 0.0031 0.0014 0.0002 0.0001 -0.0001 0.0000 0.0000
A16 -0.0004 -0.0003 -0.0001 0.0000 0.0000 0.0000 0.0000 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
该实施例中的光学系统10满足以下关系：
Figure PCTCN2020079517-appb-000008
第四实施例
参考图7和图8，在第四实施例中，光学系统10由物侧至像侧依次包括具有负屈折力的第一透镜L1、具有正屈折力的第二透镜L2、光阑STO、具有正屈折力的第三透镜L3、具有负屈折力的第四透镜L4、具有正屈折力的第五透镜L5、具有负屈折力的第六透镜L6、具有正屈折力的第七透镜L7、具有负屈折力的第八透镜L8。图8包括第四实施例中光学系统10的纵向球差图(mm)、像散图(mm)和畸变图(％)，其中的像散图和畸变图为555nm波长下的曲线图。
第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凹面。
第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；物侧面S3于圆周处为凹面，像侧面S4于圆周处为凸面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凸面；物侧面S5于圆周处为凹面，像侧面S6于圆周处为凸面。
第四透镜L4的物侧面S7于近轴处为凹面，像侧面S8于近轴处为凸面；物侧面S7于圆周处为凸面，像侧面S8于圆周处为凹面。
第五透镜L5的物侧面S9于近轴处为凸面，像侧面S10于近轴处为凸面；物侧面S9于圆周处为凸面，像侧面S10于圆周处为凹面。
第六透镜L6的物侧面S11于近轴处为凹面，像侧面S12于近轴处为凸面；物侧面S11于圆周处为 凹面，像侧面S12于圆周处为凸面。
第七透镜L7的物侧面S13于近轴处为凸面，像侧面S14于近轴处为凹面；物侧面S13于圆周处为凸面，像侧面S14于圆周处为凸面。
第八透镜L8的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面；物侧面S15于圆周处为凸面，像侧面S16于圆周处为凹面。
另外，第四实施例中光学系统10的各透镜参数由表7和表8给出，其中各结构和参数的定义可由第一实施例中得出，此处不加以赘述。
表7
Figure PCTCN2020079517-appb-000009
表8
面序号 1 2 3 4 5 6 7 8
K -1.1630 -5.5948 -12.1402 -6.8019 10.0000 -1.7205 -0.9802 7.5960
A4 0.0336 0.0355 0.1040 -0.0235 -0.0201 -0.0533 -0.0689 -0.0368
A6 -0.0088 -0.0126 -0.0878 0.0137 -0.0045 -0.0159 0.0076 0.0123
A8 0.0033 0.0078 0.0791 -0.0111 -0.0042 0.0286 -0.0131 -0.0169
A10 -0.0008 -0.0031 -0.0548 0.0050 -0.0019 -0.0330 -0.0004 0.0055
A12 0.0001 0.0008 0.0259 -0.0017 0.0033 0.0191 0.0077 0.0016
A14 0.0000 -0.0001 -0.0073 0.0000 -0.0027 -0.0057 -0.0034 -0.0011
A16 0.0000 0.0000 0.0009 0.0001 0.0004 0.0006 0.0005 0.0002
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
面序号 9 10 11 12 13 14 15 16
K -12.4040 5.6791 -27.7800 -27.8830 -8.1068 -23.6470 -4.3607 -3.1332
A4 -0.0244 0.0167 -0.0207 -0.1669 0.0391 0.1808 -0.1119 -0.0735
A6 -0.0379 -0.0443 0.0623 0.1239 -0.0113 -0.1074 0.0291 0.0232
A8 0.0162 0.0089 -0.0618 -0.0612 -0.0077 0.0338 -0.0057 -0.0055
A10 0.0066 0.0113 0.0331 0.0205 0.0045 -0.0070 0.0009 0.0009
A12 -0.0071 -0.0080 -0.0106 -0.0042 -0.0011 0.0010 -0.0001 -0.0001
A14 0.0021 0.0019 0.0020 0.0005 0.0001 -0.0001 0.0000 0.0000
A16 -0.0002 -0.0002 -0.0002 0.0000 0.0000 0.0000 0.0000 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
该实施例中的光学系统10满足以下关系：
Figure PCTCN2020079517-appb-000010
第五实施例
参考图9和图10，在第五实施例中，光学系统10由物侧至像侧依次包括具有负屈折力的第一透镜L1、具有正屈折力的第二透镜L2、光阑STO、具有正屈折力的第三透镜L3、具有负屈折力的第四透镜L4、具有负屈折力的第五透镜L5、具有负屈折力的第六透镜L6、具有正屈折力的第七透镜L7、具有负屈折力的第八透镜L8。图10包括第五实施例中光学系统10的纵向球差图(mm)、像散图(mm)和畸变图(％)，其中的像散图和畸变图为555nm波长下的曲线图。
第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凹面。
第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；物侧面S3于圆周处为凹面，像侧面S4于圆周处为凸面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凸面；物侧面S5于圆周处为凹面，像侧面S6于圆周处为凸面。
第四透镜L4的物侧面S7于近轴处为凹面，像侧面S8于近轴处为凸面；物侧面S7于圆周处为凹面，像侧面S8于圆周处为凹面。
第五透镜L5的物侧面S9于近轴处为凹面，像侧面S10于近轴处为凹面；物侧面S9于圆周处为凸面，像侧面S10于圆周处为凹面。
第六透镜L6的物侧面S11于近轴处为凹面，像侧面S12于近轴处为凸面；物侧面S11于圆周处为凹面，像侧面S12于圆周处为凸面。
第七透镜L7的物侧面S13于近轴处为凸面，像侧面S14于近轴处为凸面；物侧面S13于圆周处为凹面，像侧面S14于圆周处为凸面。
第八透镜L8的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面；物侧面S15于圆周处为凸面，像侧面S16于圆周处为凹面。
另外，第五实施例中光学系统10的各透镜参数由表9和表10给出，其中各结构和参数的定义可由第一实施例中得出，此处不加以赘述。
表9
Figure PCTCN2020079517-appb-000011
表10
面序号 1 2 3 4 5 6 7 8
K -1.2817 -5.7810 -11.6878 -7.2294 3.3331 -1.9182 -1.6194 -7.5380
A4 0.0345 0.0353 0.1030 -0.0232 -0.0190 -0.0489 -0.0354 0.0163
A6 -0.0092 -0.0121 -0.0864 0.0143 -0.0056 -0.0262 -0.0416 -0.0782
A8 0.0034 0.0075 0.0808 -0.0138 0.0010 0.0383 0.0150 0.0752
A10 -0.0009 -0.0029 -0.0593 0.0088 -0.0120 -0.0341 -0.0015 -0.0529
A12 0.0001 0.0008 0.0297 -0.0046 0.0127 0.0161 0.0004 0.0238
A14 0.0000 -0.0001 -0.0087 0.0010 -0.0076 -0.0042 0.0004 -0.0057
A16 0.0000 0.0000 0.0010 0.0000 0.0015 0.0004 -0.0002 0.0006
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
面序号 9 10 11 12 13 14 15 16
K -5.1641 -12.4040 -27.7800 -7.8830 -8.6649 -16.9991 -4.0007 -3.2604
A4 -0.0212 -0.0025 0.0071 -0.1753 0.0318 0.1881 -0.1057 -0.0647
A6 -0.1270 -0.0735 0.0280 0.1295 -0.0033 -0.1010 0.0246 0.0187
A8 0.1592 0.0591 -0.0389 -0.0639 -0.0101 0.0293 -0.0039 -0.0040
A10 -0.0961 -0.0194 0.0237 0.0214 0.0047 -0.0056 0.0006 0.0006
A12 0.0320 0.0016 -0.0082 -0.0044 -0.0010 0.0007 -0.0001 -0.0001
A14 -0.0056 0.0004 0.0016 0.0005 0.0001 -0.0001 0.0000 0.0000
A16 0.0004 -0.0001 -0.0002 0.0000 0.0000 0.0000 0.0000 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
该实施例中的光学系统10满足以下关系：
Figure PCTCN2020079517-appb-000012
第六实施例
参考图11和图12，在第六实施例中，光学系统10由物侧至像侧依次包括具有负屈折力的第一透镜L1、具有正屈折力的第二透镜L2、光阑STO、具有正屈折力的第三透镜L3、具有负屈折力的第四透镜L4、具有正屈折力的第五透镜L5、具有负屈折力的第六透镜L6、具有正屈折力的第七透镜L7、具有负屈折力的第八透镜L8。图12包括第六实施例中光学系统10的纵向球差图(mm)、像散图(mm)和畸变图(％)，其中的像散图和畸变图为555nm波长下的曲线图。
第一透镜L1的物侧面S1于近轴处为凹面，像侧面S2于近轴处为凸面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凹面。
第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面；物侧面S3于圆周处为凹面，像侧面S4于圆周处为凸面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凸面；物侧面S5于圆周处为凹面，像侧面S6于圆周处为凸面。
第四透镜L4的物侧面S7于近轴处为凹面，像侧面S8于近轴处为凹面；物侧面S7于圆周处为凹面，像侧面S8于圆周处为凹面。
第五透镜L5的物侧面S9于近轴处为凹面，像侧面S10于近轴处为凸面；物侧面S9于圆周处为凸面，像侧面S10于圆周处为凹面。
第六透镜L6的物侧面S11于近轴处为凹面，像侧面S12于近轴处为凸面；物侧面S11于圆周处为凹面，像侧面S12于圆周处为凸面。
第七透镜L7的物侧面S13于近轴处为凸面，像侧面S14于近轴处为凸面；物侧面S13于圆周处为凹面，像侧面S14于圆周处为凸面。
第八透镜L8的物侧面S15于近轴处为凸面，像侧面S16于近轴处为凹面；物侧面S15于圆周处为凸面，像侧面S16于圆周处为凹面。
另外，第六实施例中光学系统10的各透镜参数由表11和表12给出，其中各结构和参数的定义可由第一实施例中得出，此处不加以赘述。
表11
Figure PCTCN2020079517-appb-000013
Figure PCTCN2020079517-appb-000014
表12
面序号 1 2 3 4 5 6 7 8
K -1.3217 -6.6965 -12.5288 -6.6809 -10.0000 -1.9732 0.9859 -12.4040
A4 0.0353 0.0369 0.1104 -0.0234 -0.0174 -0.0510 -0.0786 -0.0545
A6 -0.0094 -0.0123 -0.0971 0.0130 -0.0079 -0.0287 -0.0108 0.0116
A8 0.0035 0.0075 0.0896 -0.0081 0.0052 0.0621 0.0442 0.0042
A10 -0.0009 -0.0028 -0.0632 0.0004 -0.0173 -0.0758 -0.0686 -0.0167
A12 0.0002 0.0007 0.0301 0.0017 0.0179 0.0480 0.0487 0.0121
A14 0.0000 -0.0001 -0.0085 -0.0013 -0.0102 -0.0157 -0.0155 -0.0035
A16 0.0000 0.0000 0.0010 0.0003 0.0020 0.0020 0.0018 0.0004
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
面序号 9 10 11 12 13 14 15 16
K 7.5960 -12.4040 -19.8565 -27.8750 -8.8148 -23.6470 -3.6255 -3.2624
A4 -0.0406 0.0040 -0.0270 -0.1658 0.0368 0.2004 -0.1085 -0.0645
A6 -0.0061 -0.0046 0.0770 0.1173 -0.0062 -0.1105 0.0260 0.0187
A8 -0.0099 -0.0320 -0.0744 -0.0545 -0.0096 0.0331 -0.0045 -0.0040
A10 0.0214 0.0357 0.0396 0.0169 0.0048 -0.0065 0.0007 0.0006
A12 -0.0127 -0.0162 -0.0127 -0.0032 -0.0011 0.0009 -0.0001 -0.0001
A14 0.0033 0.0034 0.0024 0.0003 0.0001 -0.0001 0.0000 0.0000
A16 -0.0003 -0.0003 -0.0003 0.0000 0.0000 0.0000 0.0000 0.0000
A18 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
A20 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
该实施例中的光学系统10满足以下关系：
Figure PCTCN2020079517-appb-000015
Figure PCTCN2020079517-appb-000016
参考图13，在本申请提供的一个实施例中，光学系统10与感光元件210组装以形成摄像模组20，感光元件210设置于第八透镜L8的像侧，即设置于光学系统10的像侧。一般地，感光元件210的感光表面与光学系统10的成像面S19重叠。该实施例中的第八透镜L8与感光元件210之间还设置有红外截止滤光片L9。感光元件210可以为CCD(Charge Coupled Device，电荷耦合器件)或CMOS(Complementary Metal Oxide Semiconductor，互补金属氧化物半导体)。通过采用上述光学系统10，摄像模组20能够拥有优良摄像品质。
在一些实施例中，感光元件210与光学系统10中的各透镜的距离相对固定，此时，摄像模组20为定焦模组。在另一些实施例中，可通过设置音圈马达等驱动机构以使感光元件210能够相对光学系统10中的各透镜相对移动，从而实现对焦效果。具体地，在装配上述各透镜的镜筒上设置有与驱动芯片电性连接的线圈，同时摄像模组20还设置有磁石，通过通电后的线圈与磁石之间的磁力作用以驱动镜筒相对感光元件210运动，从而实现对焦效果。在另一些实施例中，也可通过设置类似的驱动机构以驱动光学系统10中的部分透镜移动，从而实现光学变焦效果。
参考图14，本申请的一些实施例还提供了一种电子装置30，摄像模组20应用于电子装置30以使电子装置30具备摄像功能。具体地，电子装置30包括固定件310，摄像模组20安装于固定件310，固定件310可以是电路板、中框等部件。电子装置30可以是但不限于智能手机、智能手表、电子书阅读器、车载摄像设备、监控设备、医疗设备(如内窥镜)、平板电脑、生物识别设备(如指纹识别设备或瞳孔识别设备等)、PDA(Personal Digital Assistant，个人数字助理)、无人机等。具体地，在一些实施例中，电子装置30为智能手机，智能手机包括中框和电路板，电路板设置于中框，摄像模组20安装于智能手机的中框，且其中的感光元件210与电路板电性连接。摄像模组20可作为智能手机的前置摄像模组或者后置摄像模组。通过采用本申请实施例所提供的摄像模组20，电子装置30能够拥有优良的拍摄功能。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至 少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (20)

  1. 一种光学系统，由物侧至像侧依次包括：
    具有屈折力的第一透镜，所述第一透镜的物侧面于近轴处为凹面，像侧面于近轴处为凸面；
    具有正屈折力的第二透镜，所述第二透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面；
    具有正屈折力的第三透镜，所述第三透镜的像侧面于近轴处为凸面；
    具有负屈折力的第四透镜，所述第四透镜的物侧面于近轴处为凹面；
    具有屈折力的第五透镜；
    具有负屈折力的第六透镜，所述第六透镜的物侧面于近轴处为凹面；
    具有正屈折力的第七透镜，所述第七透镜的物侧面于近轴处为凸面；及
    具有负屈折力的第八透镜，所述第八透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面。
  2. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    TTL/Imgh＜1.36；
    其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，Imgh为所述光学系统于成像面上有效成像区域的对角线长的一半。
  3. 根据权利要求2所述的光学系统，其特征在于，满足以下关系：
    1.29≤TTL/Imgh≤1.30。
  4. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    2＜f/R16＜4；
    其中，f为所述光学系统的有效焦距，R16为所述第八透镜的像侧面于光轴处的曲率半径。
  5. 根据权利要求4所述的光学系统，其特征在于，满足以下关系：
    3.72≤f/R16≤3.89。
  6. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    FNO≤2；
    其中，FNO为所述光学系统的光圈数。
  7. 根据权利要求6所述的光学系统，其特征在于，满足以下关系：
    1.78≤FNO≤1.88。
  8. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    1＜SD12/SD21＜1.4；
    其中，SD12为所述第一透镜的像侧面的最大有效半口径；SD21为所述第二透镜的物侧面的最大有效半口径。
  9. 根据权利要求8所述的光学系统，其特征在于，满足以下关系：
    1.276≤SD12/SD21≤1.308。
  10. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    TTL/f＜1.65；
    其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，f为所述光学系统有效焦距。
  11. 根据权利要求10所述的光学系统，其特征在于，满足以下关系：
    1.58≤TTL/f≤1.61。
  12. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    tan(HFOV)＞1.09；
    其中，HFOV为所述光学系统的最大视场角的一半。
  13. 根据权利要求12所述的光学系统，其特征在于，满足以下关系：
    1.24≤tan(HFOV)≤1.25。
  14. 根据权利要求1所述的光学系统，其特征在于，满足以下关系：
    0＜T23/CT3＜0.9；
    其中，T23为所述第二透镜的像侧面至所述第三透镜的物侧面于光轴上的距离，CT3为所述第三透镜于光轴上的厚度。
  15. 根据权利要求14所述的光学系统，其特征在于，满足以下关系：
    0.80≤T23/CT3≤0.82。
  16. 根据权利要求1所述的光学系统，其特征在于，所述光学系统包括光阑，所述光阑设置于所述第二透镜与所述第三透镜之间。
  17. 根据权利要求1至16任意一项所述的光学系统，其特征在于，所述光学系统中各透镜的材质均为塑料。
  18. 根据权利要求1至16任意一项所述的光学系统，其特征在于，所述光学系统中各透镜的物侧面和像侧面均为非球面。
  19. 一种摄像模组，包括感光元件及权利要求1至18任意一项所述的光学系统，所述感光元件设置于所述光学系统的像侧。
  20. 一种电子装置，包括固定件及权利要求19所述的摄像模组，所述摄像模组设置于所述固定件。
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