WO2022109824A1 - 光学系统、摄像模组及电子设备 - Google Patents

光学系统、摄像模组及电子设备 Download PDF

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WO2022109824A1
WO2022109824A1 PCT/CN2020/131296 CN2020131296W WO2022109824A1 WO 2022109824 A1 WO2022109824 A1 WO 2022109824A1 CN 2020131296 W CN2020131296 W CN 2020131296W WO 2022109824 A1 WO2022109824 A1 WO 2022109824A1
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Prior art keywords
lens
optical system
object side
image side
concave
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PCT/CN2020/131296
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English (en)
French (fr)
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徐标
李明
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欧菲光集团股份有限公司
江西晶超光学有限公司
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Priority to PCT/CN2020/131296 priority Critical patent/WO2022109824A1/zh
Publication of WO2022109824A1 publication Critical patent/WO2022109824A1/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

Definitions

  • the present invention relates to the field of photography technology, in particular to an optical system, a camera module and an electronic device.
  • the seven-piece camera lens has obvious advantages and can obtain higher resolution, so it is often used in high-end mobile electronic products to improve the quality of the captured image, the resolution and the sharpness.
  • an optical system a camera module, and an electronic device are provided.
  • An optical system comprising in order from the object side to the image side:
  • the first lens with positive refractive power the object side of the first lens is convex at the paraxial position, and the image side is concave at the paraxial position;
  • the second lens with negative 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 seventh lens with negative refractive power the image side of the seventh lens is concave in the paraxial direction;
  • optical system satisfies the relation:
  • Imgh is half of the image height corresponding to the maximum field angle of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • Fno is the optical axis of the optical system Aperture number.
  • a camera module includes an image sensor and the above-mentioned optical system, wherein the image sensor is arranged on the image side of the optical system.
  • An electronic device includes a fixing piece and the above-mentioned camera module, wherein the camera module is arranged on the fixing piece.
  • FIG. 1 is a schematic structural diagram of an optical system provided by a first embodiment of the present application.
  • FIG. 2 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the first embodiment
  • FIG. 3 is a schematic structural diagram of an optical system provided by a second embodiment of the present application.
  • FIG. 4 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the second embodiment
  • FIG. 5 is a schematic structural diagram of an optical system provided by a third embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an optical system provided by a fourth embodiment of the present application.
  • FIG. 8 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fourth embodiment
  • FIG. 9 is a schematic structural diagram of an optical system provided by a fifth embodiment of the present application.
  • FIG. 10 includes longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system in the fifth embodiment
  • FIG. 11 is a schematic structural diagram of an optical system provided by a sixth embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a camera module provided by an embodiment of the application.
  • FIG. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
  • the optical system 10 includes a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 , a sixth lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 , and a sixth lens from the object side to the image side Lens L6 and seventh lens L7, wherein the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, and the seventh lens L7 has a negative refractive power.
  • the lenses in the optical system 10 are arranged coaxially, that is, the optical axes of the lenses are all located on the same straight line, and the straight line may be referred to as the optical axis of the optical system 10 .
  • the first lens L1 includes an object side S1 and an image side S2
  • the second lens L2 includes an object side S3 and an image side S4
  • the third lens L3 includes an object side S5 and an image side S6
  • the fourth lens L4 includes an object side S7 and an image side S8,
  • the fifth lens L5 includes an object side S9 and an image side S10
  • the sixth lens L6 includes an object side S11 and an image side S12
  • the seventh lens L7 includes an object side S13 and an image side S14.
  • the optical system 10 has an imaging surface S15, and the imaging surface S15 is located on the image side of the seventh lens L7.
  • the imaging surface S15 of the optical system 10 coincides with the photosensitive surface of the image sensor.
  • the imaging surface S15 can be regarded as the photosensitive surface of the photosensitive element.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S3 of the second lens L2 is convex at the paraxial position, and the image side is concave at the paraxial position.
  • S4 is concave near the axis.
  • the first lens L1 has a positive refractive power at the paraxial position, which is beneficial to shorten the overall length of the system.
  • the object side S1 of the first lens L1 is convex at the near optical axis, which can fully enhance the strength of the positive refractive power of the system undertaken by the first lens L1
  • the image side S2 is concave at the near axis, which is different from the object side.
  • S1 constitutes a meniscus structure at the paraxial position, which is beneficial to make the position of the rear principal point of the first lens L1 close to the object side, and is beneficial to further shortening the total length of the system.
  • the second lens L2 with negative refractive power can be used to correct the axial chromatic aberration and spherical aberration brought by the first lens L1 well.
  • the object side S3 of the second lens L2 is convex at the paraxial position and the image side S4 is concave at the paraxial position, it can help prevent excessive correction of spherical aberration and axial chromatic aberration of the first lens L1.
  • At least one of the object side surfaces and the image side surfaces of the first lens L1 to the seventh lens L7 is aspherical, that is, the object side surface and the image side surface of at least one of the first lens L1 to the seventh lens L7 are aspherical. / or the image side is aspherical.
  • both the object side surface and the image side surface of the first lens L1 to the seventh lens L7 can be designed as aspherical surfaces.
  • the aspheric surface configuration can further help the optical system 10 to eliminate aberrations, solve the problem of distortion of the field of view, and at the same time, it is also conducive to the miniaturized design of the optical system 10, so that the optical system 10 can maintain the miniaturized design. optical effect.
  • the object side of any one of the first lens L1 to the seventh lens L7 may be spherical or aspheric; the image side of any one of the first lens L1 to the seventh lens L7 may be
  • the spherical surface can also be an aspherical surface, and the aberration problem can also be effectively eliminated by the cooperation of the spherical surface and the aspherical surface, so that the optical system 10 has excellent imaging effect, and at the same time, the flexibility of lens design and assembly is improved.
  • the seventh lens L7 is an aspherical lens, it will facilitate the final correction of the aberrations generated by the front lenses, thereby helping to improve the imaging quality.
  • the spherical or aspherical shape is not limited to the spherical or aspherical shape shown in the drawings. The drawings are for example reference only and are not drawn strictly to scale.
  • Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex
  • r is the distance from the corresponding point on the aspheric surface to the optical axis
  • c is the curvature of the aspheric vertex
  • k is the conic coefficient
  • Ai is the aspheric surface The coefficient corresponding to the i-th higher-order term in the face formula.
  • the surface when the object side or the image side of a lens is aspherical, the surface may be an overall convex surface or an overall concave structure.
  • the surface can also be designed to have an inflection point, and the shape of the surface will change from the center to the edge, for example, the surface is convex at the center and concave at the edge.
  • one side surface of the lens is convex at the optical axis (the central area of the side surface) (the central area of the side surface), it can be understood that the area of the side surface 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 one side surface of the lens is described as concave at the circumference, it can be understood that the area of the side surface near the maximum effective aperture is concave.
  • the shape of the side surface from the center (optical axis) to the edge direction can be purely convex; or a convex shape from the center first Transitions to a concave shape and then becomes convex near the maximum effective aperture.
  • the various shapes and structures (concave-convex relationship) of the side surface are not fully reflected, but other situations can be deduced from the above examples and should also be regarded as content described in this application.
  • each lens in the optical system 10 is made of plastic, or at least one of the first lens L1 to the seventh lens L7 is made of plastic.
  • the material of each lens in some embodiments may also be glass.
  • the lens made of plastic can reduce the weight of the optical system 10 and the production cost, while the lens made of glass 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 seventh lens L7 is all plastic. In this case, since the material of the lens on the object side in the optical system 10 is glass, Therefore, 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 and cause aging.
  • the material configuration relationship of the lenses in the optical system 10 is not limited to the above-mentioned embodiment.
  • the material of any lens can be plastic or glass, and the specific design can be determined according to actual needs.
  • the optical system 10 includes an infrared cut filter 110 , and the infrared cut filter 110 is disposed on the image side of the seventh lens L7 and is relatively fixed to each lens in the optical system 10 .
  • the infrared cut-off filter 110 is used to filter out infrared light to prevent the infrared light from reaching the imaging surface S15 of the system, thereby preventing the infrared light from interfering with normal imaging.
  • the infrared cut filter 110 may be assembled with each lens as part of the optical system 10 .
  • the infrared cut-off filter 110 is not a component of the optical system 10 , and the infrared cut-off filter 110 can be installed on the optical system 10 and the photosensitive element to form a camera module. Between the system 10 and the photosensitive element.
  • the infrared cut filter 110 may also be disposed on the object side of the first lens L1.
  • a filter coating layer can also be provided on at least one of the first lens L1 to the seventh lens L7 to achieve the effect of filtering out infrared light.
  • the optical system 10 satisfies the relationship:
  • Imgh is half of the image height corresponding to the maximum angle of view of the optical system 10, or it can also be called half of the diagonal length of the effective imaging area of the imaging plane S15, and TTL is the distance from the object side of the first lens L1 to the optical system 10.
  • the distance of the imaging plane S15 on the optical axis, TTL may also be referred to as the optical total length of the optical system 10
  • Fno is the aperture number of the optical system 10 .
  • Imgh can also be understood as half the diagonal length of the rectangular effective pixel area on the image sensor.
  • Imgh 2 /(TTL*Fno) in some embodiments may be 2.31 mm, 2.32 mm, 2.33 mm, 2.34 mm or 2.35 mm.
  • the optical system 10 further satisfies 5.25mm ⁇ Imgh 2 /(TTL*Fno) ⁇ 5.37mm.
  • the optical system 10 When the optical system 10 satisfies the conditions of the above relational expression, the effective imaging area size, the total optical length, and the number of apertures of the system can be reasonably configured. On the one hand, the optical system 10 can have the characteristics of large image height to improve the imaging clarity; On the other hand, it can also prevent the total optical length and aperture number of the system from being too large, which can not only keep the axial size of the optical system 10 small, but also increase the light throughput of the system to improve the imaging quality, especially in low light environments. Get a picture with good clarity. As described above, when the conditions of the above relational expressions are satisfied, the optical system 10 can have excellent imaging performance and a miniaturized design in the axial direction.
  • the image plane size of the optical system 10 is too small, which is not conducive to high-definition imaging; on the other hand, the total axial length of the system is too long, which is not conducive to miniaturized design; in addition, the luminous flux of the system also has excessive Low risk, it is difficult to meet the needs of shooting in high-definition and low-light environments.
  • the optical system 10 also satisfies at least one of the following relationships, and when any relationship is satisfied, it can bring corresponding effects:
  • f*tan(HFOV) ⁇ 5.2mm f is the effective focal length of the optical system 10
  • HFOV is half of the maximum field angle of the optical system 10 .
  • the optical system 10 has a larger field of view, which can promote the system to have the characteristics of a large image plane, so that the system has the characteristics of high pixels and high definition.
  • the f*tan (HFOV) in some embodiments may be 5.25mm, 5.27mm, 5.3mm, 5.35mm, 5.4mm, 5.45mm, 5.5mm, 5.55mm or 5.57mm.
  • the TTL/Imgh in some embodiments may be 1.28, 1.29, 1.3, 1.31, 1.32, 1.33, 1.34, 1.35, or 1.36.
  • the total optical length of the optical system 10 can be constrained by the size of the image plane, thereby ensuring that the total length of the system is kept within a small range, thereby enabling the optical system 10 to achieve a miniaturized design in the axial direction.
  • CT2 is the thickness of the second lens L2 on the optical axis.
  • CT2 in some embodiments may be 0.31 mm, 0.32 mm or 0.33 mm.
  • the Fno in some embodiments may be 1.67, 1.7, 1.72, 1.75, 1.77, 1.8, 1.82, or 1.84.
  • R3 is the radius of curvature of the object side of the second lens L2 at the optical axis
  • R4 is the radius of curvature of the image side of the second lens L2 at the optical axis
  • R9 is The curvature radius of the object side of the fifth lens L5 at the optical axis
  • R10 is the curvature radius of the image side of the fifth lens L5 at the optical axis.
  • in some embodiments may be 0.45, 0.5, 0.6, 0.65, 0.75, 1, 1.8, 1.9, 2.5, 3, 3.5, 3.7, or 3.9.
  • the sum of the radii of curvature of the surfaces on both sides of the second lens L2 (at the optical axis) and the sum of the radii of curvature of the surfaces on both sides of the fifth lens L5 (at the optical axis) tend to be close, and the incident light is here.
  • the deflection between the two lenses tends to be gentle, which can reduce the incident angle of the incident light when it reaches the two lenses, thereby effectively reducing the sensitivity of the system and improving the yield of the system.
  • f2/(f6+f7) ⁇ 28 f2 is the effective focal length of the second lens L2
  • f6 is the effective focal length of the sixth lens L6
  • f7 is the effective focal length of the seventh lens L7.
  • f2/(f6+f7) in some embodiments may be 0.8, 1, 3, 5, 10, 15, 20, 21, 22, 24, 25, or 25.5.
  • the f56/f in some embodiments may be 1.2, 1.25, 1.3, 1.35, 1.4 or 1.45.
  • the combined focal length of the fifth lens L5 and the sixth lens L6 can obtain the constraint of the effective focal length of the system, so that the refractive power of the lens group formed by the fifth lens L5 and the sixth lens L6 will not be too strong, In this way, advanced spherical aberration can be well corrected and the imaging quality of the system can be improved.
  • ET1 is the distance from the maximum effective aperture on the object side of the first lens L1 to the maximum effective aperture on the image side in the direction of the optical axis. ET1 may also be referred to as the edge thickness of the first lens L1. ET1 in some embodiments may be 0.25mm, 0.27mm, 0.29mm, 0.3mm or 0.32mm. When this relationship is satisfied, the edge thickness of the first lens L1 can be well controlled, so that the advanced aberrations of the system can be effectively balanced, the imaging performance of the system can be improved, and the thickness of the lens will not be too thin, making it easy to form the lens.
  • ET3 is the distance from the maximum effective aperture on the object side of the third lens L3 to the maximum effective aperture on the image side in the direction of the optical axis. ET3 may also be referred to as the edge thickness of the third lens L3. ET3 in some embodiments may be 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm or 0.41mm. When this relationship is satisfied, the edge thickness of the third lens L3 can be well controlled, and the distortion of the system can be reasonably controlled, so that the optical system 10 has good optical performance, and the thickness of the lens is not too thin, which is easy to manufacture. .
  • SAG51 is the sag of the object side of the fifth lens L5 at the maximum effective aperture
  • SAG52 is the sag of the image side of the fifth lens L5 at the maximum effective aperture.
  • the SAG51/SAG52 in some embodiments may be 0.9, 0.92, 0.94, 0.96, 0.98, 1, 1.02, 1.04, 1.06, or 1.08.
  • the surface difference between the object side and the image side of the fifth lens L5 will not be too large, which is beneficial to reduce the tolerance sensitivity of the fifth lens L5, and is conducive to the processing and molding of the lens, thereby better realizing engineering manufacture.
  • the sag of a lens surface is the distance from the center of the surface to the maximum effective clear aperture of the surface in the direction parallel to the optical axis; when the value is positive, in the direction parallel to the optical axis of the system , the maximum effective clear aperture of the surface is located on the image side where the surface intersects the optical axis; when the value is negative, in the direction parallel to the optical axis of the system, the maximum effective clear aperture of the surface is on the object side where the plane intersects the optical axis.
  • V2 is the Abbe number of the second lens L2
  • V3 is the Abbe number of the third lens L3.
  • the optical system 10 includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side.
  • FIG. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the first embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.
  • the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.
  • the object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.
  • the object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.
  • the object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is concave at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.
  • the object side S11 of the sixth lens L6 is convex at the paraxial position, and the image side S12 is convex at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.
  • the object side S13 of the seventh lens L7 is concave at the paraxial position, and the image side S14 is concave at the paraxial position; the object side S13 is concave at the circumference, and the image side S14 is convex at the circumference.
  • each of the first lens L1 to the seventh lens L7 are aspherical.
  • the problem of the distortion of the field of view of the optical system 10 can be effectively solved, and the lens can also achieve excellent optical effects in the case of a small and thin lens, thereby enabling the optical system 10 to achieve an excellent optical effect.
  • Having a smaller volume is beneficial to realize the miniaturized design of the optical system 10 .
  • each lens in the optical system 10 is plastic.
  • the use of plastic lenses can reduce the manufacturing cost of the optical system 10 .
  • Table 2 shows the aspheric coefficients of the corresponding surfaces of the lenses in Table 1, where k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface formula.
  • the elements from the object plane to the image plane (the imaging plane S15, which can also be understood as the photosensitive surface of the photosensitive element during later assembly) are sequentially arranged in the order of the elements in Table 1 from top to bottom.
  • the surfaces corresponding to surface numbers 2 and 3 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 absolute value of the first value of the lens in the "Thickness" parameter column is the thickness of the lens on the optical axis
  • the absolute value of the second value is the image side of the lens to the object side of the following optical element on the optical axis. on the distance.
  • 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 .
  • the infrared filter in the parameter tables of the following embodiments is the infrared cut-off filter 110 .
  • the reference wavelengths of the refractive index, Abbe number, and focal length of each lens are all 555 nm.
  • the relational formula calculation and lens structure of each embodiment are based on lens parameters (such as Table 1, Table 2, Table 3, Table 4, etc.).
  • the optical system 10 satisfies the following relationships:
  • Imgh is half of the image height corresponding to the maximum angle of view of the optical system 10, or it can also be called half of the diagonal length of the effective imaging area of the imaging plane S15, and TTL is the distance from the object side of the first lens L1 to the optical system 10. The distance of the imaging plane S15 on the optical axis, and Fno is the aperture number of the optical system 10 . It should be noted that, when the optical system 10 is assembled with the image sensor, Imgh can also be understood as half of the diagonal length of the rectangular effective pixel area on the image sensor. When the optical system 10 satisfies the conditions of the above relational expression, the effective imaging area size, the total optical length, and the number of apertures of the system can be reasonably configured.
  • the optical system 10 can have the characteristics of large image height to improve the imaging clarity; On the other hand, it can also prevent the total optical length and aperture number of the system from being too large, which can not only keep the axial size of the optical system 10 small, but also increase the light throughput of the system to improve the imaging quality, especially in low light environments. Get a picture with good clarity. As described above, when the conditions of the above relational expressions are satisfied, the optical system 10 can have excellent imaging performance and a miniaturized design in the axial direction.
  • the image plane size of the optical system 10 is too small, which is not conducive to high-definition imaging; on the other hand, the total axial length of the system is too long, which is not conducive to miniaturized design; in addition, the luminous flux of the system also has excessive Low risk, it is difficult to meet the needs of shooting in high-definition and low-light environments.
  • f*tan(HFOV) 5.37mm; f is the effective focal length of the optical system 10 , and HFOV is half of the maximum field angle of the optical system 10 .
  • the optical system 10 has a larger field of view, which can promote the system to have the characteristics of a large image plane, so that the system has the characteristics of high pixels and high definition.
  • the generation of vignetting can be better suppressed.
  • the total optical length of the optical system 10 can be constrained by the size of the image plane, thereby ensuring that the total length of the system is kept within a small range, thereby enabling the optical system 10 to achieve a miniaturized design in the axial direction.
  • CT2 0.33mm; CT2 is the thickness of the second lens L2 on the optical axis.
  • CT2 is the thickness of the second lens L2 on the optical axis.
  • R3 is the radius of curvature of the object side of the second lens L2 at the optical axis
  • R4 is the radius of curvature of the image side of the second lens L2 at the optical axis
  • R9 is The curvature radius of the object side of the fifth lens L5 at the optical axis
  • R10 is the curvature radius of the image side of the fifth lens L5 at the optical axis.
  • the sum of the radii of curvature of the surfaces on both sides of the second lens L2 (at the optical axis) and the sum of the radii of curvature of the surfaces on both sides of the fifth lens L5 (at the optical axis) tend to be close, and the incident light is here.
  • the deflection between the two lenses tends to be gentle, which can reduce the incident angle of the incident light when it reaches the two lenses, thereby effectively reducing the sensitivity of the system and improving the yield of the system.
  • f2/(f6+f7) 21.9; f2 is the effective focal length of the second lens L2, f6 is the effective focal length of the sixth lens L6, and f7 is the effective focal length of the seventh lens L7.
  • f56/f 1.33; f56 is the combined focal length of the fifth lens L5 and the sixth lens L6 , and f is the effective focal length of the optical system 10 .
  • the combined focal length of the fifth lens L5 and the sixth lens L6 can obtain the constraint of the effective focal length of the system, so that the refractive power of the lens group formed by the fifth lens L5 and the sixth lens L6 will not be too strong, In this way, advanced spherical aberration can be well corrected and the imaging quality of the system can be improved.
  • ET1 0.32mm; ET1 is the distance from the maximum effective aperture on the object side of the first lens L1 to the maximum effective aperture on the image side in the direction of the optical axis.
  • ET3 0.37mm; ET3 is the distance from the maximum effective aperture on the object side of the third lens L3 to the maximum effective aperture on the image side in the direction of the optical axis.
  • SAG51/SAG52 0.89; SAG51 is the sag of the object side of the fifth lens L5 at the maximum effective aperture, and SAG52 is the sag of the image side of the fifth lens L5 at the maximum effective aperture.
  • SAG51 is the sag of the object side of the fifth lens L5 at the maximum effective aperture
  • SAG52 is the sag of the image side of the fifth lens L5 at the maximum effective aperture.
  • V2 is the Abbe number of the second lens L
  • V3 is the Abbe number of the third lens L3.
  • the Abbe numbers of the second lens L2 and the third lens L3 are controlled in a reasonable range, which is conducive to improving the aberration of the system, such as eliminating the chromatic aberration of the system, reducing the secondary spectrum of the system, and improving the system. System imaging performance.
  • FIG. 2 includes a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) of the optical system 10, which represents the deviation of the converging focus of light of different wavelengths after passing through the lens.
  • the ordinate of the longitudinal spherical aberration map represents the normalized pupil coordinate (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the distance from the imaging plane to the intersection of the light and the optical axis (unit is mm).
  • FIG. 2 also includes a field curvature diagram (Astigmatic Field Curves) of the optical system 10, wherein the S curve represents the sagittal field curvature at 555 nm, and the T curve represents the meridional field curvature at 555 nm. It can be seen from the figure that the field curvature of the system is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images.
  • FIG. 2 also includes a distortion diagram (Distortion) of the optical system 10. It can be seen from the diagram that the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.
  • the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side.
  • FIG. 4 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the second embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.
  • the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.
  • the object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.
  • the object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.
  • the object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is concave at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.
  • the object side S11 of the sixth lens L6 is convex at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.
  • the object side S13 of the seventh lens L7 is concave at the paraxial position, and the image side S14 is concave at the paraxial position; the object side S13 is concave at the circumference, and the image side S14 is convex at the circumference.
  • lens parameters of the optical system 10 in the second embodiment are given in Table 3 and Table 4, wherein the definitions of the structures and parameters can be obtained from the first embodiment, and will not be repeated here.
  • the camera module 10 in this embodiment satisfies the following relationship:
  • the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side.
  • FIG. 6 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the third embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is convex at the circumference.
  • the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.
  • the object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.
  • the object side S7 of the fourth lens L4 is convex at the paraxial position, and the image side S8 is concave at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.
  • the object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is concave at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.
  • the object side S11 of the sixth lens L6 is convex at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.
  • the object side S13 of the seventh lens L7 is concave at the paraxial position, and the image side S14 is concave at the paraxial position; the object side S13 is concave at the circumference, and the image side S14 is convex at the circumference.
  • lens parameters of the optical system 10 in the third embodiment are given in Table 5 and Table 6, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which will not be repeated here.
  • the camera module 10 in this embodiment satisfies the following relationship:
  • the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, 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 positive refractive power, and the seventh lens L7 with negative refractive power.
  • FIG. 8 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the fourth embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.
  • the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.
  • the object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is convex at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.
  • the object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.
  • the object side S9 of the fifth lens L5 is convex at the paraxial position, and the image side S10 is concave at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.
  • the object side S11 of the sixth lens L6 is convex at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.
  • the object side S13 of the seventh lens L7 is convex at the paraxial position, and the image side S14 is concave at the paraxial position; the object side S13 is concave at the circumference, and the image side S14 is convex at the circumference.
  • lens parameters of the optical system 10 in the fourth embodiment are given in Table 7 and Table 8, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which will not be repeated here.
  • the camera module 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side.
  • FIG. 10 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system 10 in the fifth embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.
  • the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.
  • the object side S5 of the third lens L3 is convex at the paraxial position, and the image side S6 is concave at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.
  • the object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is convex at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.
  • the object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is concave at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.
  • the object side S11 of the sixth lens L6 is convex at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.
  • the object side S13 of the seventh lens L7 is concave at the paraxial position, and the image side S14 is concave at the paraxial position; the object side S13 is convex at the circumference, and the image side S14 is convex at the circumference.
  • lens parameters of the optical system 10 in the fifth embodiment are given in Table 9 and Table 10, wherein the definitions of the structures and parameters can be obtained from the first embodiment, and will not be repeated here.
  • the camera module 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, and an aperture stop STO from the object side to the image side.
  • FIG. 12 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the sixth embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555 nm.
  • the object side S1 of the first lens L1 is convex at the paraxial position, and the image side S2 is concave at the paraxial position; the object side S1 is convex at the circumference, and the image side S2 is concave at the circumference.
  • the object side S3 of the second lens L2 is convex at the paraxial position, and the image side S4 is concave at the paraxial position; the object side S3 is convex at the circumference, and the image side S4 is concave at the circumference.
  • the object side S5 of the third lens L3 is concave at the paraxial position, and the image side S6 is convex at the paraxial position; the object side S5 is concave at the circumference, and the image side S6 is convex at the circumference.
  • the object side S7 of the fourth lens L4 is concave at the paraxial position, and the image side S8 is concave at the paraxial position; the object side S7 is concave at the circumference, and the image side S8 is convex at the circumference.
  • the object side S9 of the fifth lens L5 is concave at the paraxial position, and the image side S10 is convex at the paraxial position; the object side S9 is concave at the circumference, and the image side S10 is convex at the circumference.
  • the object side S11 of the sixth lens L6 is convex at the paraxial position, and the image side S12 is concave at the paraxial position; the object side S11 is concave at the circumference, and the image side S12 is convex at the circumference.
  • the object side S13 of the seventh lens L7 is convex at the paraxial position, and the image side S14 is concave at the paraxial position; the object side S13 is concave at the circumference, and the image side S14 is convex at the circumference.
  • lens parameters of the optical system 10 in the sixth embodiment are given in Table 11 and Table 12, wherein the definitions of the structures and parameters can be obtained from the first embodiment, and will not be repeated here.
  • the camera module 10 in this embodiment satisfies the following relationship:
  • the camera module 20 may include the optical system 10 and the image sensor 210 of any one of the above-mentioned embodiments, and the image sensor 210 is disposed on the image of the optical system 10 . side.
  • the image sensor 210 may be a CCD (Charge Coupled Device, charge coupled device) or a CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor).
  • CCD Charge Coupled Device, charge coupled device
  • CMOS Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor
  • the camera module 20 includes an infrared cut filter 110 disposed between the seventh lens L7 and the image sensor 210 , and the infrared cut filter 110 is used to filter out infrared light.
  • the infrared cut filter 110 may be mounted to the image end of the lens.
  • the camera module 20 further includes a protective glass, the protective glass is disposed between the infrared cut filter and the image sensor 210 , and the protective glass is used to protect the image sensor 210 .
  • the camera module 20 can have the characteristics of large image area, high light intensity and small axial dimension, so as to not only have good imaging performance, but also realize the miniaturized design in the axial direction.
  • the camera module 20 since the camera module 20 has the characteristics of high light intensity, it can improve the shooting clarity in a dark light environment.
  • some embodiments of the present application further provide an electronic device 30 , and the camera module 20 is applied to the electronic device 30 .
  • the electronic device 30 includes a fixing member 310
  • the camera module 20 is mounted on the fixing member 310
  • the fixing member 310 may be a circuit board, a middle frame, a back cover and other components.
  • the electronic device 30 can be, but is not limited to, a smartphone, a smart watch, a smart glasses, an e-book reader, an in-vehicle camera device, a monitoring device, a drone, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a Fingerprint recognition equipment or pupil recognition equipment, etc.), PDA (Personal Digital Assistant, personal digital assistant), drones, etc.
  • the electronic device 30 will have good camera performance, and can improve the shooting clarity in a dark light environment, and can also prevent the axial size of the module from causing a large reduction in the thickness of the device. limitations, which is conducive to the realization of the thin design of the device.
  • the electronic device 30 is a smart phone
  • the above-mentioned small axial size design of the camera module 20 can promote the ultra-thin design of the device.
  • the "electronic equipment” used in the embodiments of the present invention may include, but is not limited to, be configured to be connected via wired lines (eg, via a public switched telephone network (PSTN), a digital subscriber line, DSL), digital cable, direct cable connection, and/or another data connection/network) and/or via (eg, for cellular networks, wireless local area networks (WLAN), such as digital video broadcasting handheld, DVB-H) network digital television network, satellite network, AM-FM (amplitude modulation-frequency modulation, AM-FM) broadcast transmitter, and/or another communication terminal) wireless interface to receive/send communication signals installation.
  • PSTN public switched telephone network
  • DSL digital subscriber line
  • DSL digital cable, direct cable connection, and/or another data connection/network
  • WLAN wireless local area networks
  • AM-FM amplitude modulation-frequency modulation, AM-FM
  • wireless communication terminals Electronic devices arranged to communicate over a wireless interface may be referred to as “wireless communication terminals", “wireless terminals” and/or “mobile terminals”.
  • mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that may combine cellular radio telephones with data processing, facsimile, and data communication capabilities; may include radio telephones, pagers, Internet/ Personal digital assistants (PDAs) with intranet access, web browsers, memo pads, calendars, and/or global positioning system (GPS) receivers; and conventional laptops and/or palmtops A receiver or other electronic device including a radiotelephone transceiver.
  • PCS personal communication system
  • PDAs Internet/ Personal digital assistants
  • GPS global positioning system
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with “first”, “second” may expressly or implicitly include at least one of that feature.
  • plurality means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • installed may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • a first feature "on” or “under” a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch.
  • the first feature being “above”, “over” and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature being “below”, “below” and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level 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：具有正屈折力的第一透镜(L1)，其物侧面(S1)于近轴处为凸面，像侧面(S2)于近轴处为凹面；具有负屈折力的第二透镜(L2)，其物侧面(S3)于近轴处为凸面，像侧面(S4)于近轴处为凹面；具有屈折力的第三透镜(L3)、第四透镜(L4)、第五透镜(L5)、第六透镜(L6)；具有负屈折力的第七透镜(L7)，其像侧面(S14)于近轴为凹面；光学系统(10)满足关系：Imgh 2/(TTL*Fno)≥2.3mm；Imgh为光学系统(10)最大视场角所对应的像高的一半，TTL为光学系统(10)的光学总长，Fno为光学系统(10)的光圈数。

Description

光学系统、摄像模组及电子设备 技术领域
本发明涉及摄影技术领域，特别是涉及种光学系统、摄像模组及电子设备。
背景技术
随着科技的更新换代，消费者们对移动电子产品的拍摄质量的要求也越来越高。一般地，七片式的摄像镜头具有明显优势，能够获得更高的解析力，因此常用于高端移动电子产品，以改善拍摄的画质感、提高分辨率以及清晰度。
但对于一般电子产品而言，市场往往希望电子产品不仅能够拥有优良摄像性能，同时还能够尽可能地减小厚度。但对于具有七片式结构的摄像镜头，由于透镜数量较多，这类镜头系统的轴向尺寸往往难以缩小，难以在满足优良摄像性能的同时还保持较短的长度，进而难以满足电子产品对高摄像性能及小厚度的需求。
发明内容
根据本申请的各种实施例，提供一种光学系统、摄像模组及电子设备。
一种光学系统，由物侧至像侧依次包括：
具有正屈折力的第一透镜，所述第一透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面；
具有负屈折力的第二透镜，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；
具有屈折力的第三透镜；
具有屈折力的第四透镜；
具有屈折力的第五透镜；
具有屈折力的第六透镜；
具有负屈折力的第七透镜，所述第七透镜的像侧面于近轴为凹面；
所述光学系统满足关系：
Imgh 2/(TTL*Fno)≥2.3mm；
Imgh为所述光学系统最大视场角所对应的像高的一半，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，Fno为所述光学系统的光圈数。
一种摄像模组，包括图像传感器及上述光学系统，所述图像传感器设置于所述光学系统的像侧。
一种电子设备，包括固定件及上述摄像模组，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结构示意图；
图2包括第一实施例中光学系统的纵向球差图、像散图和畸变图；
图3为本申请第二实施例提供的光学系统的结构示意图；
图4包括第二实施例中光学系统的纵向球差图、像散图和畸变图；
图5为本申请第三实施例提供的光学系统的结构示意图；
图6包括第三实施例中光学系统的纵向球差图、像散图和畸变图；
图7为本申请第四实施例提供的光学系统的结构示意图；
图8包括第四实施例中光学系统的纵向球差图、像散图和畸变图；
图9为本申请第五实施例提供的光学系统的结构示意图；
图10包括第五实施例中光学系统的纵向球差图、像散图和畸变图；
图11为本申请第六实施例提供的光学系统的结构示意图；
图12包括第六实施例中光学系统的纵向球差图、像散图和畸变图；
图13为本申请一实施例提供的摄像模组的结构示意图；
图14为本申请一实施例提供的电子设备的结构示意图。
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。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“内”、“外”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
参考图1，在本申请的实施例中，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、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6及第七透镜L7，其中第一透镜L1具有正屈折力，第二透镜L2具有负屈折力，第七透镜L7具有负屈折力。光学系统10中各透镜同轴设置，即各透镜的光轴均位于同一直线上，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L6包括物侧面S11和像侧面S12，第七透镜L7包括物侧面S13和像侧面S14。另外，光学系统10还有一成像面S15，成像面S15位于第七透镜L7的像侧。一般地，光学系统10的成像面S15与图像传感器的感光面重合，为方便理解，可将成像面S15视为感光元件的感光表面。
在本申请的实施例中，第一透镜L1的物侧面S1于近轴处为凸面，像侧面S2于近轴处为凹面；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。第一透镜L1于近轴处具有正屈折力，有利于缩短系统的总长。另外，第一透镜L1的物侧面S1在近光轴处为凸面，可充分增强第一透镜L1所承担的系统的正屈折力强度，且其像侧面S2于近轴处为凹面，与物侧面S1构成在近轴处的弯月形结构，从而有利于使第一透镜L1的后侧主点位置靠近物侧，有利于进一步实现系统总长的缩短。
而具有负屈折力的第二透镜L2能够用于良好地校正第一透镜L1带来的轴上色差和球面像差。特别地，由于第二透镜L2的物侧面S3于近轴处为凸面，像侧面S4于近轴处为凹面，可有助于防止对第一透镜L1的球面像差和轴上色差校正过度。
在一些实施例中，第一透镜L1至第七透镜L7的各物侧面及像侧面中的至少一个表面为非球面，即第一透镜L1至第七透镜L7中，至少一者的物侧面及/或像侧面为非球面。例如可以将第一透镜L1至第七透镜L7的物侧面及像侧面均设计为非球面。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至第七透镜L7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至第七透镜L7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，当第七透镜L7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 PCTCN2020131296-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阶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。
在一些实施例中，光学系统10中各透镜的材质均为塑料，或者第一透镜L1至第七透镜L7中的至少一者的材质为塑料。当然，一些实施例中的各透镜的材质也可均为玻璃。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至第七透镜L7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，具体设计可根据实际需求而确定。
在一些实施例中，光学系统10包括红外截止滤光片110，红外截止滤光片110设置于第七透镜L7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110用于滤除红外光，防止红外光到达系统的成像面S15，从而防止红外光干扰正常成像。红外截止滤光片110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110并不属于光学系统10的元件，此时红外截止滤光片110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110也可设置在第一透镜L1的物侧。另外，在一些实施例中也可通过在第一透镜L1至第七透镜L7中的至少一个透镜上设置滤光镀层以实现滤除红外光的作用。
进一步地，在本申请的实施例中，光学系统10满足关系：
Imgh 2/(TTL*Fno)≥2.3mm；
Imgh为光学系统10最大视场角所对应的像高的一半，或者也可称为成像面S15有效成像区域的对角线长度的一半，TTL为第一透镜L1的物侧面至光学系统10的成像面S15于光轴上的距离，TTL也可称为光学系统10的光学总长，Fno为光学系统10的光圈数。应注意的是，当光学系统10与图像传感器装配时，Imgh也可理解为图像传感器上的矩形有效像素区域的对角线长度的一半。一些实施例中的Imgh 2/(TTL*Fno)可以为2.31mm、2.32mm、2.33mm、2.34mm或2.35mm。在一些实施例中，光学系统10进一步满足5.25mm≤Imgh 2/(TTL*Fno)≤5.37mm。
当光学系统10满足上述关系式条件时，系统的有效成像区域尺寸、光学总长、光圈数之间能够得到合理配置，一方面可使光学系统10拥有大像高特性以提升成像清晰度；另一方面也可防止系统的光学总长和光圈数过大，不仅能够使光学系统10保持较小的轴向尺寸，同时也能提升系统的通光量以改善成像质量，特别是在暗光环境下也能够获得清晰度良好的画面。以上，通过满足上述关系式条件时，光学系统10能够拥有优良摄像性能及轴向小型化设计。当低于关系式下限时，光学系统10的像面尺寸过小，不利于高清晰成像；另一方面，系统的轴向总长过长而不利于小型化设计；另外，系统的光 通量也存在过低的风险，难以满足高清晰及暗光环境下拍摄的需求。
此外，在一些实施例中，光学系统10还满足以下至少一个关系，且当满足任一关系式时均能带来相应的效果：
f*tan(HFOV)≥5.2mm；f为光学系统10的有效焦距，HFOV为光学系统10的最大视场角的一半。满足该关系时，光学系统10拥有较大的视场范围，可以促使系统具有大像面的特性，从而使系统具有高像素和高清晰度的特点。另外，配合系统高通光量的特性，可以较好地抑制暗角的产生。一些实施例中的f*tan(HFOV)可以为5.25mm、5.27mm、5.3mm、5.35mm、5.4mm、5.45mm、5.5mm、5.55mm或5.57mm。
TTL/Imgh≤1.4。一些实施例中的TTL/Imgh可以为1.28、1.29、1.3、1.31、1.32、1.33、1.34、1.35或1.36。满足该关系时，光学系统10的光学总长能够受到像面尺寸的约束，从而确保系统的总长保持在较小的范围内，进而使光学系统10实现轴向的小型化设计。
0.3mm≤CT2≤0.4mm；CT2为第二透镜L2于光轴上的厚度。一些实施例中的CT2可以为0.31mm、0.32mm或0.33mm。满足该关系时，第二透镜L2的中心厚度被约束在合理范围内，不仅可以使透镜具有良好的加工特性，同时还有利于缩短光学系统10的总长。
Fno≤1.9。一些实施例中的Fno可以为1.67、1.7、1.72、1.75、1.77、1.8、1.82或1.84。满足该关系时，可以确保光学系统10拥有大孔径特性，使光学系统10有足够的进光量，以提高拍摄画面的清晰度，特别在拍摄夜景、星空等暗光场景下依然能够拥有良好的成像质量。
|R3+R4|/|R9+R10|≤4.5；R3为第二透镜L2的物侧面于光轴处的曲率半径，R4为第二透镜L2的像侧面于光轴处的曲率半径，R9为第五透镜L5的物侧面于光轴处的曲率半径，R10为第五透镜L5的像侧面于光轴处的曲率半径。一些实施例中的|R3+R4|/|R9+R10|可以为0.45、0.5、0.6、0.65、0.75、1、1.8、1.9、2.5、3、3.5、3.7或3.9。满足该关系时，第二透镜L2两侧表面的曲率半径(于光轴处)之和与第五透镜L5两侧表面的曲率半径(于光轴处)之和趋于接近，入射光线在这两个透镜之间的偏转趋于平缓，可以减小入射光线在到达这两个透镜时的入射角度，进而有效的降低系统的敏感度，提高系统的良率。
f2/(f6+f7)≤28；f2为第二透镜L2的有效焦距，f6为第六透镜L6的有效焦距，f7为第七透镜L7的有效焦距。一些实施例中的f2/(f6+f7)可以为0.8、1、3、5、10、15、20、21、22、24、25或25.5。满足该关系时，能够合理分配第二透镜L2、第六透镜L6以及第七透镜L7的球差贡献，进而使光学系统10于近轴区域具有良好的成像质量
f56/f≥1.0；f56为第五透镜L5和第六透镜L6的组合焦距，f为光学系统10的有效焦距。一些实施例中的f56/f可以为1.2、1.25、1.3、1.35、1.4或1.45。满足该关系时，第五透镜L5和第六透镜L6的组合焦距能够得到系统的有效焦距的约束，从而使得第五透镜L5和第六透镜L6所组成的透镜组的屈折力不会过强，以此可良好地校正高级球差，提升系统的成像品质。
0.23mm≤ET1≤0.33mm；ET1为第一透镜L1物侧面最大有效孔径处至像侧面最大有效孔径处于光轴方向上的距离。ET1也可称为第一透镜L1的边缘厚度。一些实施例中的ET1可以为0.25mm、0.27mm、0.29mm、0.3mm或0.32mm。满足该关系时，第一透镜L1的边缘厚度能够得到较好的控制，从而能够有效平衡系统的高级像差，提高系统的成像性能，且透镜的厚度不会过薄，易于透镜的成型。
0.3mm≤ET3≤0.45mm；ET3为第三透镜L3物侧面最大有效孔径处至像侧面最大有效孔径处于光轴方向上的距离。ET3也可称为第三透镜L3的边缘厚度。一些实施例中的ET3可以为0.36mm、0.37mm、0.38mm、0.39mm、0.4mm或0.41mm。满足该关系时，第三透镜L3的边缘厚度能够得到较好的控制，可合理的控制系统的畸变大小，使光学系统10具有良好的光学性能，且透镜的厚度不会过薄，易于工程制造。
0.5≤SAG51/SAG52≤1.5；SAG51为第五透镜L5的物侧面于最大有效孔径处的矢高，SAG52为第五透镜L5的像侧面于最大有效孔径处的矢高。一些实施例中的SAG51/SAG52可以为0.9、0.92、0.94、0.96、0.98、1、1.02、1.04、1.06或1.08。满足该关系时，第五透镜L5的物侧面和像侧面的面型差异不会过大，从而有利于降低第五透镜L5的公差敏感度，且利于透镜的加工成型，进而更好的实现工 程制造。
应注意的是，某个透镜表面的矢高为该表面中心至该面的最大有效通光口径处于平行光轴方向上的距离；当该值为正值时，在平行于系统的光轴的方向上，该面的最大有效通光口径处位于该面与光轴相交处的像侧；当该值为负值时，在平行于系统的光轴的方向上，该面的最大有效通光口径处位于该面与光轴相交处的物侧。
|V2-V3|≥35；V2为第二透镜L2的阿贝数，V3为第三透镜L3的阿贝数。满足上述关系时，第二透镜L2和第三透镜L3的阿贝数被控制在合理的范围，有利于改善系统的像差，例如有利于消除系统的色差，减小系统的二级光谱，提高系统成像性能。
应注意的是，以上光线系统10所满足的各关系式范围的确定及所对应的效果针对的是前述的七片式镜头结构。
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孔径光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2、具有正屈折力的第三透镜L3、具有正屈折力的第四透镜L4、具有负屈折力的第五透镜L5、具有正屈折力的第六透镜L6及具有负屈折力的第七透镜L7。图2包括第一实施例中光学系统10的纵向球差图、像散图和畸变图，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于近轴处为凸面，像侧面S2于近轴处为凹面；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于圆周处为凸面，像侧面S4于圆周处为凹面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凹面；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于圆周处为凸面。
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于圆周处为凹面，像侧面S10于圆周处为凸面。
第六透镜L6的物侧面S11于近轴处为凸面，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于近轴处为凹面，像侧面S14于近轴处为凹面；物侧面S13于圆周处为凹面，像侧面S14于圆周处为凸面。
第一透镜L1至第七透镜L7中各透镜的物侧面和像侧面均为非球面。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。
另外，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。
光学系统10的各透镜参数由以下的表1和表2给出。表2为表1中各透镜相应表面的非球面系数，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S15，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。面序号2和3所对应的表面分别表示第一透镜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的绝对值为该透镜于光轴上的厚度，第二个数值的绝对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。另外，以下各实施例参数表格中的红外滤光片为红外截止滤光片110。
参考表1，在第一实施例中，光学系统10的有效焦距f＝5.96mm，光圈数FNO＝1.81，最大视场角(即对角线方向最大视角)FOV＝84°，光学总长TTL＝7mm。
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 PCTCN2020131296-appb-000002
表2
Figure PCTCN2020131296-appb-000003
Figure PCTCN2020131296-appb-000004
在第一实施例中，光学系统10满足以下各关系：
Imgh 2/(TTL*Fno)＝2.34mm；
Imgh为光学系统10最大视场角所对应的像高的一半，或者也可称为成像面S15有效成像区域的对角线长度的一半，TTL为第一透镜L1的物侧面至光学系统10的成像面S15于光轴上的距离，Fno为光学系统10的光圈数。应注意的是，当光学系统10与图像传感器装配时，Imgh也可理解为图像传感器上的矩形有效像素区域的对角线长度的一半。当光学系统10满足上述关系式条件时，系统的有效成像区域尺寸、光学总长、光圈数之间能够得到合理配置，一方面可使光学系统10拥有大像高特性以提升成像清晰度；另一方面也可防止系统的光学总长和光圈数过大，不仅能够使光学系统10保持较小的轴向尺寸，同时也能提升系统的通光量以改善成像质量，特别是在暗光环境下也能够获得清晰度良好的画面。以上，通过满足上述关系式条件时，光学系统10能够拥有优良摄像性能及轴向小型化设计。当低于关系式下限时，光学系统10的像面尺寸过小，不利于高清晰成像；另一方面，系统的轴向总长过长而不利于小型化设计；另外，系统的光通量也存在过低的风险，难以满足高清晰及暗光环境下拍摄的需求。
f*tan(HFOV)＝5.37mm；f为光学系统10的有效焦距，HFOV为光学系统10的最大视场角的一半。满足该关系时，光学系统10拥有较大的视场范围，可以促使系统具有大像面的特性，从而使系统具有高像素和高清晰度的特点。另外，配合系统高通光量的特性，可以较好地抑制暗角的产生。
TTL/Imgh＝1.28。满足该关系时，光学系统10的光学总长能够受到像面尺寸的约束，从而确保系统的总长保持在较小的范围内，进而使光学系统10实现轴向的小型化设计。
CT2＝0.33mm；CT2为第二透镜L2于光轴上的厚度。满足该关系时，第二透镜L2的中心厚度被约束在合理范围内，不仅可以使透镜具有良好的加工特性，同时还有利于缩短光学系统10的总长。
Fno＝1.81。满足该关系时，可以确保光学系统10拥有大孔径特性，使光学系统10有足够的进光量，以提高拍摄画面的清晰度，特别在拍摄夜景、星空等暗光场景下依然能够拥有良好的成像质量。
|R3+R4|/|R9+R10|＝3.997；R3为第二透镜L2的物侧面于光轴处的曲率半径，R4为第二透镜L2的像侧面于光轴处的曲率半径，R9为第五透镜L5的物侧面于光轴处的曲率半径，R10为第五透镜L5的像侧面于光轴处的曲率半径。满足该关系时，第二透镜L2两侧表面的曲率半径(于光轴处)之和与第五透镜L5两侧表面的曲率半径(于光轴处)之和趋于接近，入射光线在这两个透镜之间的偏转趋于平缓，可以减小入射光线在到达这两个透镜时的入射角度，进而有效的降低系统的敏感度，提高系统的良率。
f2/(f6+f7)＝21.9；f2为第二透镜L2的有效焦距，f6为第六透镜L6的有效焦距，f7为第七透镜L7的有效焦距。满足该关系时，能够合理分配第二透镜L2、第六透镜L6以及第七透镜L7的球差贡献，进而使光学系统10于近轴区域具有良好的成像质量
f56/f＝1.33；f56为第五透镜L5和第六透镜L6的组合焦距，f为光学系统10的有效焦距。满足 该关系时，第五透镜L5和第六透镜L6的组合焦距能够得到系统的有效焦距的约束，从而使得第五透镜L5和第六透镜L6所组成的透镜组的屈折力不会过强，以此可良好地校正高级球差，提升系统的成像品质。
ET1＝0.32mm；ET1为第一透镜L1物侧面最大有效孔径处至像侧面最大有效孔径处于光轴方向上的距离。满足该关系时，第一透镜L1的边缘厚度能够得到较好的控制，从而能够有效平衡系统的高级像差，提高系统的成像性能，且透镜的厚度不会过薄，易于透镜的成型。
ET3＝0.37mm；ET3为第三透镜L3物侧面最大有效孔径处至像侧面最大有效孔径处于光轴方向上的距离。满足该关系时，第三透镜L3的边缘厚度能够得到较好的控制，可合理的控制系统的畸变大小，使光学系统10具有良好的光学性能，且透镜的厚度不会过薄，易于工程制造。
SAG51/SAG52＝0.89；SAG51为第五透镜L5的物侧面于最大有效孔径处的矢高，SAG52为第五透镜L5的像侧面于最大有效孔径处的矢高。满足该关系时，第五透镜L5的物侧面和像侧面的面型差异不会过大，从而有利于降低第五透镜L5的公差敏感度，且利于透镜的加工成型，进而更好的实现工程制造。
|V2-V3|＝36.51；V2为第二透镜L2的阿贝数，V3为第三透镜L3的阿贝数。满足上述关系时，第二透镜L2和第三透镜L3的阿贝数被控制在合理的范围，有利于改善系统的像差，例如有利于消除系统的色差，减小系统的二级光谱，提高系统成像性能。
另一方面，图2包括光学系统10的纵向球面像差图(Longitudinal Spherical Aberration)，其表示不同波长的光线经由镜头后的汇聚焦点偏离。纵向球面像差图的纵坐标表示归一化的由光瞳中心至光瞳边缘的光瞳坐标(Normalized Pupil Coordinator)，横坐标表示成像面到光线与光轴交点的距离(单位为mm)。由纵向球面像差图可知，第一实施例中的各波长光线的汇聚焦点偏离程度趋于一致，成像画面中的弥散斑或色晕得到有效抑制。图2还包括光学系统10的场曲图(Astigmatic Field Curves)，其中S曲线代表555nm下的弧矢场曲，T曲线代表555nm下的子午场曲。由图中可知，系统的场曲较小，各视场的场曲和像散均得到了良好的校正，视场中心和边缘均拥有清晰的成像。图2还包括光学系统10的畸变图(Distortion)，由图中可知，由主光束引起的图像变形较小，系统的成像质量优良。
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孔径光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2、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、具有正屈折力的第六透镜L6及具有负屈折力的第七透镜L7。图4包括第二实施例中光学系统10的纵向球差图、像散图和畸变图，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于近轴处为凸面，像侧面S2于近轴处为凹面；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于圆周处为凸面，像侧面S4于圆周处为凹面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凹面；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于圆周处为凸面。
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于圆周处为凹面，像侧面S10于圆周处为凸面。
第六透镜L6的物侧面S11于近轴处为凸面，像侧面S12于近轴处为凹面；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于近轴处为凹面，像侧面S14于近轴处为凹面；物侧面S13于圆周处为凹面，像侧面S14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 PCTCN2020131296-appb-000005
表4
Figure PCTCN2020131296-appb-000006
Figure PCTCN2020131296-appb-000007
该实施例中的摄像模组10满足以下关系：
Imgh 2/(TTL*Fno) 2.34 f2/(f6+f7) 21.60
f*tan(HFOV) 5.59 f56/f 1.33
TTL/Imgh 1.28 ET1 0.32
CT2 0.31 ET3 0.36
Fno 1.81 SAG51/SAG52 0.91
|R3+R4|/|R9+R10| 2.450 |V2-V3| 36.51
由图4中的像差图可知，光学系统10的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统10拥有良好的成像品质。
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孔径光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2、具有负屈折力的第三透镜L3、具有正屈折力的第四透镜L4、具有负屈折力的第五透镜L5、具有正屈折力的第六透镜L6及具有负屈折力的第七透镜L7。图6包括第三实施例中光学系统10的纵向球差图、像散图和畸变图，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于近轴处为凸面，像侧面S2于近轴处为凹面；物侧面S1于圆周处为凸面，像侧面S2于圆周处为凸面。
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；物侧面S3于圆周处为凸面，像侧面S4于圆周处为凹面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凹面；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于近轴处为凸面，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于圆周处为凸面。
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于圆周处为凹面，像侧面S10于圆周处为凸面。
第六透镜L6的物侧面S11于近轴处为凸面，像侧面S12于近轴处为凹面；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于近轴处为凹面，像侧面S14于近轴处为凹面；物侧面S13于圆周处为凹面，像侧面S14于圆周处为凸面。
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 PCTCN2020131296-appb-000008
Figure PCTCN2020131296-appb-000009
表6
Figure PCTCN2020131296-appb-000010
Figure PCTCN2020131296-appb-000011
该实施例中的摄像模组10满足以下关系：
Imgh 2/(TTL*Fno) 2.34 f2/(f6+f7) 25.89
f*tan(HFOV) 5.29 f56/f 1.25
TTL/Imgh 1.28 ET1 0.23
CT2 0.32 ET3 0.41
Fno 1.81 SAG51/SAG52 0.89
|R3+R4|/|R9+R10| 0.647 |V2-V3| 36.51
由图6中的像差图可知，光学系统10的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统10拥有良好的成像品质。
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孔径光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2、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、具有正屈折力的第六透镜L6及具有负屈折力的第七透镜L7。图8包括第四实施例中光学系统10的纵向球差图、像散图和畸变图，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于近轴处为凸面，像侧面S2于近轴处为凹面；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于圆周处为凸面，像侧面S4于圆周处为凹面。
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于圆周处为凸面。
第五透镜L5的物侧面S9于近轴处为凸面，像侧面S10于近轴处为凹面；物侧面S9于圆周处为凹面，像侧面S10于圆周处为凸面。
第六透镜L6的物侧面S11于近轴处为凸面，像侧面S12于近轴处为凹面；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于圆周处为凹面，像侧面S14于圆周处为凸面。
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 PCTCN2020131296-appb-000012
Figure PCTCN2020131296-appb-000013
表8
Figure PCTCN2020131296-appb-000014
该实施例中的摄像模组10满足以下关系：
Imgh 2/(TTL*Fno) 2.31 f2/(f6+f7) 7.62
f*tan(HFOV) 5.29 f56/f 1.15
TTL/Imgh 1.28 ET1 0.32
CT2 0.33 ET3 0.37
Fno 1.84 SAG51/SAG52 0.92
|R3+R4|/|R9+R10| 0.753 |V2-V3| 36.51
由图8中的像差图可知，光学系统10的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统10拥有良好的成像品质。
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孔径光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2、具有正屈折力的第三透镜L3、具有正屈折力的第四透镜L4、具有负屈折力的第五透镜L5、具有正屈折力的第六透镜L6及具有负屈折力的第七透镜L7。图10包括第五实施例中光学系统10的纵向球差图、像散图和畸变图，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于近轴处为凸面，像侧面S2于近轴处为凹面；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于圆周处为凸面，像侧面S4于圆周处为凹面。
第三透镜L3的物侧面S5于近轴处为凸面，像侧面S6于近轴处为凹面；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于圆周处为凸面。
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于圆周处为凹面，像侧面S10于圆周处为凸面。
第六透镜L6的物侧面S11于近轴处为凸面，像侧面S12于近轴处为凹面；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于近轴处为凹面，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。
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 PCTCN2020131296-appb-000015
Figure PCTCN2020131296-appb-000016
表10
Figure PCTCN2020131296-appb-000017
该实施例中的摄像模组10满足以下关系：
Imgh 2/(TTL*Fno) 2.34 f2/(f6+f7) 22.51
f*tan(HFOV) 5.32 f56/f 1.42
TTL/Imgh 1.29 ET1 0.33
CT2 0.33 ET3 0.36
Fno 1.81 SAG51/SAG52 0.90
|R3+R4|/|R9+R10| 1.811 |V2-V3| 36.51
由图10中的像差图可知，光学系统10的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统10拥有良好的成像品质。
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孔径光阑STO、具有正屈折力的第一透镜L1、具有负屈折力的第二透镜L2、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、具有正屈折力的第六透镜L6及具有负屈折力的第七透镜L7。图12包括第六实施例中光学系统10的纵向球差图、像散图和畸变图，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于近轴处为凸面，像侧面S2于近轴处为凹面；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于圆周处为凸面，像侧面S4于圆周处为凹面。
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于近轴处为凹面；物侧面S7于圆周处为凹面，像侧面S8于圆周处为凸面。
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于圆周处为凹面，像侧面S10于圆周处为凸面。
第六透镜L6的物侧面S11于近轴处为凸面，像侧面S12于近轴处为凹面；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于圆周处为凹面，像侧面S14于圆周处为凸面。
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 PCTCN2020131296-appb-000018
Figure PCTCN2020131296-appb-000019
表12
Figure PCTCN2020131296-appb-000020
该实施例中的摄像模组10满足以下关系：
Imgh 2/(TTL*Fno) 2.35 f2/(f6+f7) 0.70
f*tan(HFOV) 5.25 f56/f 1.48
TTL/Imgh 1.36 ET1 0.28
CT2 0.31 ET3 0.40
Fno 1.67 SAG51/SAG52 1.08
|R3+R4|/|R9+R10| 0.419 |V2-V3| 36.51
由图12中的像差图可知，光学系统10的纵向球差、场曲和畸变均得到良好的控制，从而该实施例的光学系统10拥有良好的成像品质。
参考图13，本申请的一些实施例还提供了一种摄像模组20，摄像模组20可包括上述任意一个实 施例的光学系统10及图像传感器210，图像传感器210设置于光学系统10的像侧。图像传感器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)。一般地，在装配时，光学系统10的成像面S15与图像传感器210的感光表面重合。
在一些实施例中，摄像模组20包括设于第七透镜L7与图像传感器210之间的红外截止滤光片110，红外截止滤光片110用于滤除红外光。在一些实施例中，红外截止滤光片110可安装至镜头的像端。在一些实施例中，摄像模组20还包括保护玻璃，保护玻璃设于红外截止滤光片与图像传感器210之间，保护玻璃用于保护图像传感器210。
通过采用上述光学系统10，摄像模组20能够拥有大像面、高通光量及较小的轴向尺寸的特性，从而不仅可拥有良好的摄像性能，且还可实现轴向的小型化设计。特别地，由于摄像模组20具有高通光量特性，因此能够提升在暗光环境下的拍摄清晰度。
参考图14，本申请的一些实施例还提供了一种电子设备30，摄像模组20应用于电子设备30。具体地，电子设备30包括固定件310，摄像模组20安装于固定件310，固定件310可以为电路板、中框、后盖等部件。电子设备30可以为但不限于智能手机、智能手表、智能眼镜、电子书阅读器、车载摄像设备、监控设备、无人机、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。通过采用上述摄像模组20，电子设备30将具有良好的摄像性能，且能够提升在暗光环境下的拍摄清晰度，另外还可防止模组的轴向尺寸对设备的厚度减小造成较大的限制，从而有利于实现设备的薄化设计。特别地，当电子设备30为智能手机时，上述摄像模组20的轴向小尺寸设计能够促进设备实现超薄化设计。
本发明实施例中所使用到的“电子设备”可包括，但不限于被设置成经由有线线路连接(如经由公共交换电话网络(public switched telephone network，PSTN)、数字用户线路(digital subscriber line，DSL)、数字电缆、直接电缆连接，以及/或另一数据连接/网络)和/或经由(例如，针对蜂窝网络、无线局域网(wireless local area network，WLAN)、诸如手持数字视频广播(digital video broadcasting handheld，DVB-H)网络的数字电视网络、卫星网络、调幅-调频(amplitude modulation-frequency modulation，AM-FM)广播发送器，以及/或另一通信终端的)无线接口接收/发送通信信号的装置。被设置成通过无线接口通信的电子设备可以被称为“无线通信终端”、“无线终端”以及/或“移动终端”。移动终端的示例包括，但不限于卫星或蜂窝电话；可以组合蜂窝无线电电话与数据处理、传真以及数据通信能力的个人通信系统(personal communication system，PCS)终端；可以包括无线电电话、寻呼机、因特网/内联网接入、Web浏览器、记事簿、日历以及/或全球定位系统(global positioning system，GPS)接收器的个人数字助理(personal digital assistant，PDA)；以及常规膝上型和/或掌上型接收器或包括无线电电话收发器的其它电子设备。
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 (21)

  1. 一种光学系统，由物侧至像侧依次包括：
    具有正屈折力的第一透镜，所述第一透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面；
    具有负屈折力的第二透镜，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；
    具有屈折力的第三透镜；
    具有屈折力的第四透镜；
    具有屈折力的第五透镜；
    具有屈折力的第六透镜；
    具有负屈折力的第七透镜，所述第七透镜的像侧面于近轴为凹面；
    所述光学系统满足关系：
    Imgh 2/(TTL*Fno)≥2.3mm；
    Imgh为所述光学系统为所述光学系统的最大视场角所对应的像高的一半，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，Fno为所述光学系统的光圈数。
  2. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    f*tan(HFOV)≥5.2mm；
    f为所述光学系统的有效焦距，HFOV为所述光学系统的最大视场角的一半。
  3. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    TTL/Imgh≤1.4。
  4. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    0.3mm≤CT2≤0.4mm；
    CT2为所述第二透镜于光轴上的厚度。
  5. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    Fno≤1.9。
  6. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    |R3+R4|/|R9+R10|≤4.5；
    R3为所述第二透镜的物侧面于光轴处的曲率半径，R4为所述第二透镜的像侧面于光轴处的曲率半径，R9为所述第五透镜的物侧面于光轴处的曲率半径，R10为所述第五透镜的像侧面于光轴处的曲率半径。
  7. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    f2/(f6+f7)≤28；
    f2为所述第二透镜的有效焦距，f6为所述第六透镜的有效焦距，f7为所述第七透镜的有效焦距。
  8. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    f56/f≥1.0；
    f56为所述第五透镜和所述第六透镜的组合焦距，f为所述光学系统的有效焦距。
  9. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    0.23mm≤ET1≤0.33mm；
    ET1为所述第一透镜物侧面最大有效孔径处至像侧面最大有效孔径处于光轴方向上的距离。
  10. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    0.3mm≤ET3≤0.45mm；
    ET3为所述第三透镜物侧面最大有效孔径处至像侧面最大有效孔径处于光轴方向上的距离。
  11. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    0.5≤SAG51/SAG52≤1.5；
    SAG51为所述第五透镜的物侧面于最大有效孔径处的矢高，SAG52为所述第五透镜的像侧面于最大有效孔径处的矢高。
  12. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足关系：
    |V2-V3|≥35；
    V2为所述第二透镜的阿贝数，V3为所述第三透镜的阿贝数。
  13. 根据权利要求1所述的光学系统，其特征在于，所述光学系统进一步满足关系：
    5.25mm≤Imgh 2/(TTL*Fno)≤5.37mm。
  14. 根据权利要求1所述的光学系统，其特征在于，所述光学系统包括孔径光阑，所述孔径光阑设于所述第一透镜的物侧。
  15. 根据权利要求1至14任意一项所述的光学系统，其特征在于，所述第一透镜至所述第七透镜中，至少一者的材质为塑料。
  16. 根据权利要求15所述的光学系统，其特征在于，所述第一透镜至所述第七透镜中，各透镜的材质均为塑料。
  17. 根据权利要求1至14任意一项所述的光学系统，其特征在于，所述第一透镜至所述第七透镜中，至少一者的物侧面及/或像侧面为非球面。
  18. 根据权利要求17所述的光学系统，其特征在于，所述第一透镜至所述第七透镜中，各透镜的物侧面和像侧面均为非球面。
  19. 根据权利要求1所述的光学系统，其特征在于，所述光学系统包括红外截止滤光片，所述红外截止滤光片设于所述第七透镜的像侧。
  20. 一种摄像模组，包括图像传感器及权利要求1至19任意一项所述的光学系统，所述图像传感器设置于所述光学系统的像侧。
  21. 一种电子设备，包括固定件及权利要求20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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