WO2022165840A1 - 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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Publication number
WO2022165840A1
WO2022165840A1 PCT/CN2021/076027 CN2021076027W WO2022165840A1 WO 2022165840 A1 WO2022165840 A1 WO 2022165840A1 CN 2021076027 W CN2021076027 W CN 2021076027W WO 2022165840 A1 WO2022165840 A1 WO 2022165840A1
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lens
optical system
optical axis
object side
image side
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PCT/CN2021/076027
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English (en)
French (fr)
Inventor
邹金华
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/CN2021/076027 priority Critical patent/WO2022165840A1/zh
Publication of WO2022165840A1 publication Critical patent/WO2022165840A1/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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the invention relates to the technical field of photography and imaging, in particular to an optical system, a camera module and an electronic device.
  • an optical system a camera module, and an electronic device are provided.
  • An optical system comprising in sequence from the object side to the image side along the optical axis:
  • the object side of the second lens is convex at the near optical axis
  • the image side of the third lens is convex at the near optical axis
  • a fourth lens with refractive power the object side of the fourth lens is concave at the near optical axis, and the image side is convex at the near optical axis;
  • the fifth lens with negative refractive power the object side of the fifth lens is concave at the near optical axis, and the image side is convex at the near optical axis;
  • the sixth lens with positive refractive power the object side of the sixth lens is convex near the optical axis, and is concave near the maximum effective aperture;
  • a seventh lens with negative refractive power the object side of the seventh lens is convex at the near optical axis;
  • optical system satisfies the relational condition:
  • f234 is the combined focal length of the second lens, the third lens and the fourth lens, and f1 is the effective focal length of the first lens.
  • a camera module includes an image sensor and the optical system described in any one of the above, wherein the image sensor is arranged on the image side of the optical system.
  • An electronic device includes a fixing member and the above-mentioned camera module, wherein the camera module is arranged on the fixing member.
  • 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 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.
  • an embodiment of the present application provides an optical system 10 having a seven-piece structure.
  • the optical system 10 includes a first lens L1 , a second lens L2 , a third lens L1 , a second lens L2 , and a third lens along the optical axis 101 from the object side to the image side in sequence.
  • 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 called the optical axis 101 of the optical system 10 .
  • the above-mentioned optical elements and the diaphragm not mentioned in the optical system 10 can be assembled with the lens barrel to form an imaging lens.
  • 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 image sensor.
  • the first lens L1 has positive refractive power
  • the second lens L2 has negative refractive power
  • its object side S3 is convex at the near optical axis
  • the third lens L3 has positive refractive power
  • its image side S6 is convex at the near optical axis
  • the fourth lens L4 has positive or negative refractive power
  • the object side S7 is concave at the near optical axis
  • the image side S8 is convex at the near optical axis
  • the fifth lens L5 has Negative refractive power
  • the object side S9 is concave at the near optical axis
  • the image side S10 is convex at the near optical axis
  • the sixth lens L6 has positive refractive power
  • its object side S11 is convex at the near optical axis, and in A concave surface near the maximum effective aperture, that is, a concave surface near the circumference
  • the seventh lens L7 has a negative refractive power, and its object side surface S
  • a surface of the lens is convex near the optical axis
  • the area of the surface of the lens near the optical axis 101 is convex; when describing a surface of the lens When it is concave near the maximum effective aperture or near the circumference, it can be understood that the area of the surface near the maximum effective aperture is concave.
  • the shape of the surface from the center (at the optical axis 101) to the edge direction can be purely convex; The convex shape in the center transitions to a concave shape and then becomes convex near the maximum effective aperture.
  • the concave-convex surface type description in this application is only for the surface type of the effective light-transmitting area of the corresponding lens surface.
  • the refractive power and surface shape of the above-mentioned lenses distributed from the object side to the image side are reasonably matched, so that aberrations can be corrected well, so as to improve the imaging quality of the optical system 10, and at the same time, it is also beneficial to compress the optical system 10 in the direction of the optical axis. size of.
  • multiple lenses are arranged in a cycle of positive and negative refractive power, which can help the aberrations generated by each lens to be corrected sequentially and smoothly, and can better avoid the problem of insufficient correction or excessive correction.
  • the deflection of the light in the fringe field of view can be effectively suppressed, that is, the incidence of the light in the fringe field of view on the imaging plane S15 of the optical system 10 can be reduced.
  • Angle which is beneficial to alleviate the vignetting problem in edge imaging under large field of view; at the same time, it can also effectively improve spherical aberration and correct off-axis coma and astigmatism.
  • the optical system 10 also satisfies the relationship: 1.2 ⁇ f234/f1 ⁇ 2.5; f234 is the combined focal length of the second lens L2, the third lens L3 and the fourth lens L4, and f1 is the focal length of the first lens L1 Effective focal length.
  • the combined focal length of the second lens L2, the third lens L3 and the fourth lens L4 can be reasonable with the effective focal length of the first lens L1.
  • the converging ability of the optical system 10 to the incident light can be strengthened, which is beneficial to shorten the overall length of the optical system 10, and at the same time, a larger field of view can be obtained; on the other hand, the combination of positive and negative lenses can cancel each other.
  • the positive refractive power provided by the first lens L1 and the negative refractive power provided by the second lens L2 can also promote the balance of the spherical aberration of the optical system 10 to achieve good imaging quality.
  • the equivalent positive refractive power of the front lens group formed by the first lens L1 to the fourth lens L4 is too strong, resulting in the correction of the rear lens group formed by the fifth lens L5 to the seventh lens L7
  • the aberration capability is insufficient, resulting in high-order aberrations, which affects the imaging quality of the optical system 10 .
  • the relationship satisfied by the optical system 10 may specifically be 1.4, 1.43, 1.47, 1.55, 1.6, 1.8, 1.9, 2.05, 2.15, 2.2 or 2.25.
  • the optical system 10 also satisfies at least one of the following relationships, and when any relationship is satisfied, it can bring corresponding technical effects:
  • R12 is the radius of curvature of the object side S11 of the sixth lens L6 at the optical axis
  • R13 is the radius of curvature of the image side S12 of the sixth lens L6 at the optical axis Radius of curvature.
  • the surface shape of the side surface S12 can effectively reduce the incident angle of the light of the edge field of view on the imaging surface S15, and further alleviate the problem of vignetting around the image under the condition of a large field of view.
  • the relationship satisfied by the optical system 10 may specifically be -4.2, -4, -3.8, -3.5, -3, -2.5, -2, -1.5, -1.2, -1, -0.9 or -0.75.
  • T12 is the distance from the image side S2 of the first lens L1 to the object side S3 of the second lens L2 on the optical axis
  • CT1 is the thickness of the first lens L1 on the optical axis.
  • T45 is the distance from the image side S8 of the fourth lens L4 to the object side S9 of the fifth lens L5 on the optical axis
  • CT3 is the optical axis of the third lens L3.
  • the thickness on the axis, CT4 is the thickness of the fourth lens L4 on the optical axis
  • CT5 is the thickness of the fifth lens L5 on the optical axis.
  • TTL is the distance from the object side S1 of the first lens L1 to the imaging surface S15 of the optical system 10 on the optical axis
  • ImgH is half of the image height corresponding to the maximum angle of view of the optical system 10 .
  • Imgh can also be understood as the distance from the center of the rectangular effective pixel area to the diagonal edge of the image sensor, and the diagonal direction of the above-mentioned effective imaging area is parallel to the diagonal direction of the rectangular effective pixel area. .
  • the optical system 10 with the above seven-piece design will have the characteristics of a large image surface, so that it can match the high-pixel image sensor, thereby satisfying the high-quality imaging effect; it can also effectively reduce the total length of the optical system 10 , so as to realize the small size design of the optical system 10 in the direction of the optical axis.
  • it is higher than the upper limit of the relational expression it is difficult for the optical system 10 to have the characteristics of a large image plane, and it is difficult to effectively compress the total length of the system, which is not conducive to miniaturized design.
  • the relationship satisfied by the optical system 10 may specifically be 1.40, 1.41, 1.43, 1.44, 1.46 or 1.47.
  • f is the effective focal length of the optical system 10
  • f7 is the effective focal length of the seventh lens L7.
  • the relationship satisfied by the optical system 10 may specifically be -0.6, -0.58, -0.55, -0.5, -0.46, -0.4, -0.38 or -0.36.
  • the first lens L1 and the third lens L3 provide positive refractive power to the optical system 10, and when the above relationship is satisfied, the effective focal lengths of the first lens L1 and the third lens L3 can be reasonably controlled, thereby balancing the first lens L1
  • the positive refractive power of the optical system 10 can be prevented from excessively increasing the spherical aberration due to the excessive concentration of the refractive power on the first lens L1 , resulting in a decrease in the imaging quality of the optical system 10 .
  • the relationship satisfied by the optical system 10 may specifically be 0.93, 0.95, 0.97, 1, 1.12, 1.2, 1.35, 1.44, 1.53, 1.6, 1.63 or 1.66.
  • CT6 is the thickness of the sixth lens L6 on the optical axis
  • SAG61 is the sagittal height of the object side surface S11 of the sixth lens L6 at the maximum effective aperture.
  • the center thickness of the sixth lens L6 and the edge sag of the object side surface S11 can be mutually constrained, so as to reduce the surface complexity of the object side surface S11, and further facilitate the manufacture and molding of the sixth lens L6 , which reduces the defect of poor lens molding; and can also trim the field curvature generated by each lens on the object side, so as to promote the balance of the field curvature of the system and improve the imaging quality of the optical system 10 .
  • the sag of the lens surface at the maximum effective aperture is the distance from the intersection of the surface with the optical axis to the maximum effective aperture in the direction parallel to the optical axis 101 .
  • the relationship satisfied by the optical system 10 may specifically be 7.8, 8, 8.5, 8.74, 9, 10.4, 12.6, 13.5, 14.5, 25, 55, 75, 80 or 85.
  • V3 is the Abbe number of the third lens L3 under d light
  • V4 is the Abbe number of the fourth lens L4 under d light
  • V5 is the fifth lens L5 under d light Abbe number in light.
  • the relationship satisfied by the optical system 10 may specifically be 3.9, 3.95, 4, 4.05, 4.3, 4.6, 4.8, 5, 5.04, 5.1, 5.13 or 5.17.
  • R10 is the radius of curvature of the object side S9 of the fifth lens L5 at the optical axis
  • R11 is the radius of curvature of the image side S10 of the fifth lens L5 at the optical axis.
  • f7 is the effective focal length of the seventh lens L7
  • R14 is the radius of curvature of the object side surface S13 of the seventh lens L7 at the optical axis.
  • the relationship between the effective focal length of the seventh lens L7 and the radius of curvature of the object side surface S13 at the optical axis can be reasonably configured to reduce the incident angle of light on the image sensor, so that the optical system 10 can better It can match the common image sensor and avoid serious ghost image stray light.
  • the relationship satisfied by the optical system 10 may specifically be 4.0, 4.15, 4.37, 4.8, 5.2, 5.45, 6, 6.75, 7.44, 7.68, 7.89 or 8.05.
  • each of the above focal length parameters at least represents the focal length of the corresponding lens at the near optical axis.
  • the above relational conditions and the technical effects brought about are aimed at the seven-piece optical system 10 with the above-mentioned lens design.
  • the lens design number of lenses, refractive power configuration, surface configuration, etc.
  • the optical system 10 includes an aperture stop STO.
  • the aperture stop STO is used to control the amount of light entering the optical system 10, and at the same time, it can play a role of blocking ineffective light.
  • the aperture stop STO is arranged on the object side of the first lens L1. At least a partial region of the object side surface S1 of the first lens L1 passes through the aperture stop STO toward the object side.
  • the aperture stop STO may be disposed on the object side of the first lens L1, or may be disposed between two adjacent lenses among the first lens L1 to the seventh lens L7.
  • the aperture stop STO may be formed of a barrel structure that holds the lens, or may be a gasket that is separately fitted between the lens and the barrel.
  • the object side and/or the image side of at least one of the first lens L1 to the seventh lens L7 are aspherical, that is, at least one of the first lens L1 to the seventh lens L7 has an aspherical surface type.
  • 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 and solve the problem of distortion of the field of view, and 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 surface and/or the image side surface of at least one of the first lens L1 to the seventh lens L7 may also be spherical.
  • the actual surface shape of the lens is not limited to the spherical or aspherical shape shown in the drawings, which are for example reference only and are not drawn strictly to scale.
  • the surface may be a structure that exhibits a convex surface or a concave surface as a whole.
  • 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.
  • the object side surface S11 of the sixth lens L6 has an inflection point. This is only an example to illustrate the relationship between the near optical axis and the circumference.
  • the specific surface structure (concave-convex relationship) of any surface of any lens can be various, and is not limited to the above example.
  • Z is the distance from the corresponding point on the aspheric surface to the tangent plane of the surface at the optical axis
  • r is the distance from the corresponding point on the aspheric surface to the optical axis
  • c is the curvature of the aspheric surface at the optical axis
  • k is the cone coefficient
  • Ai is the coefficient of the high-order term corresponding to the i-th-order high-order term in the aspheric surface formula.
  • the material of each lens in the optical system 10 is 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.
  • the glass lens located on the object side has a good resistance effect to extreme environments, and is not easily affected by the object side environment and causes aging, so when the optical system 10 is exposed to extreme environments such as high temperature, this structure can be better.
  • At least one of the first lens L1 to the seventh lens L7 is made of plastic, and at least one is made of glass.
  • the material configuration relationship of the lenses in the optical system 10 is not limited to the above embodiments.
  • 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 and prevent the infrared light from reaching the imaging surface S15 of the optical system 10, 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 filter 110 is not a component of the optical system 10, and the infrared cut filter 110 can be installed between the optical system 10 and the image sensor when the optical system 10 and the image sensor are assembled together. between.
  • 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 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, and a first lens with negative refractive power from the object side to the image side along the optical axis 101 .
  • the optical system 10 in the first embodiment includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the first embodiment, and the reference wavelengths of the astigmatism diagram and the distortion diagram in the following embodiments are both 587.56 nm.
  • the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the object side S1 is convex near the circumference, and the image side S2 is convex near the circumference.
  • the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; the object side S3 is concave near the circumference, and the image side S4 is convex near the circumference.
  • the object side S5 of the third lens L3 is concave at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave near the circumference, and the image side S6 is convex near the circumference.
  • the object side S7 of the fourth lens L4 is concave at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave near the circumference, and the image side S8 is convex near the circumference.
  • the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis; the object side S9 is concave near the circumference, and the image side S10 is convex near the circumference.
  • the object side S11 of the sixth lens L6 is a convex surface at the near optical axis, and the image side S12 is a convex surface at the near optical axis; the object side S11 is a concave surface near the circumference, and the image side S12 is a convex surface near the circumference.
  • the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis; the object side S13 is concave near the circumference, and the image side S14 is convex near the circumference.
  • the refractive power and surface shape of the above-mentioned lenses distributed from the object side to the image side are reasonably matched, so that aberrations can be corrected well, so as to improve the imaging quality of the optical system 10, and at the same time, it is also beneficial to compress the optical system 10 in the direction of the optical axis. size of.
  • multiple lenses are arranged in a cyclic manner of positive and negative refractive power, which can help the aberrations generated by each lens to be corrected sequentially and smoothly, and can better avoid the problem of insufficient correction or overcorrection.
  • the object side surface S11 of the sixth lens L6 satisfy the above-mentioned surface configuration, the light deflection of the fringe field of view can be effectively suppressed, that is, the incident angle of the light of the fringe field of view on the imaging plane S15 of the optical system 10 can be reduced , which is beneficial to alleviate the vignetting problem of edge imaging under large field of view; at the same time, it can also effectively improve spherical aberration and correct off-axis coma and astigmatism.
  • Table 2 presents the aspheric coefficients of the corresponding lens surfaces 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 type formula.
  • the elements from the object side to the image side of the optical system 10 are arranged in order from top to bottom in Table 1.
  • the diaphragm in the table is the aperture diaphragm STO, and the infrared filter is the infrared cut filter 110 .
  • 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 is the radius of curvature of the corresponding surface of the lens at 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 surface of the following optical element (such as the latter).
  • the distance on the optical axis of the object side of the lens or the diaphragm plane), the value of the diaphragm in the "thickness" parameter represents the distance on the optical axis from the diaphragm plane to the object side of the following optical element.
  • the IR filters in the table are IR cut filters.
  • the reference wavelength of the refractive index, Abbe number and focal length of each lens is 587.6 nm
  • the Y radius, thickness, focal length (effective focal length) ) are in units of millimeters (mm).
  • the relational calculation and lens structure of each embodiment are based on the data provided in the parameter tables (eg, Table 1, Table 2, Table 3, Table 4, etc.).
  • the effective focal length f of the optical system 10 is 4.25mm
  • the aperture number FNO is 2.2
  • the half HFOV of the maximum field of view is 43.7°
  • the total optical length TTL is 6.0mm.
  • the rectangular effective pixel area of the image sensor has a diagonal direction.
  • HFOV can also be understood as half of the maximum field angle of the optical system 10 parallel to the diagonal direction.
  • the materials of the first lens L1 to the seventh lens L7 are all plastic, and the object side surface and the image side surface of each lens are aspherical.
  • the optical system 10 also satisfies the following relationships:
  • f234/f1 1.986; f234 is the combined focal length of the second lens L2, the third lens L3 and the fourth lens L4, and f1 is the effective focal length of the first lens L1.
  • the combined focal length of the second lens L2, the third lens L3 and the fourth lens L4 can be reasonable with the effective focal length of the first lens L1.
  • the converging ability of the optical system 10 to the incident light can be strengthened, which is beneficial to shorten the overall length of the optical system 10, and at the same time, a larger field of view can be obtained; on the other hand, the combination of positive and negative lenses can cancel each other.
  • the positive refractive power provided by the first lens L1 and the negative refractive power provided by the second lens L2 can also promote the spherical aberration balance of the optical system 10 to achieve good imaging quality.
  • R12 is the radius of curvature of the object side S11 of the sixth lens L6 at the optical axis
  • R13 is the radius of curvature of the image side S12 of the sixth lens L6 at the optical axis .
  • T12/CT1 0.574; T12 is the distance from the image side S2 of the first lens L1 to the object side S3 of the second lens L2 on the optical axis, and CT1 is the thickness of the first lens L1 on the optical axis.
  • T45+CT5)/(CT3+CT4) 0.893;
  • T45 is the distance from the image side S8 of the fourth lens L4 to the object side S9 of the fifth lens L5 on the optical axis, and
  • CT3 is the third lens L3 on the optical axis ,
  • CT4 is the thickness of the fourth lens L4 on the optical axis,
  • CT5 is the thickness of the fifth lens L5 on the optical axis.
  • TTL/ImgH 1.435; TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the imaging surface S15 of the optical system 10 , and ImgH is half of the image height corresponding to the maximum angle of view of the optical system 10 .
  • Imgh can also be understood as the distance from the center of the rectangular effective pixel area to the diagonal edge of the image sensor, and the diagonal direction of the above-mentioned effective imaging area is parallel to the diagonal direction of the rectangular effective pixel area. .
  • the optical system 10 with the above seven-piece design will have the characteristics of a large image surface, so that it can match the high-pixel image sensor, thereby satisfying the high-quality imaging effect; it can also effectively reduce the total length of the optical system 10 , so as to realize the small size design of the optical system 10 in the direction of the optical axis.
  • f/f7 -0.63; f is the effective focal length of the optical system 10, and f7 is the effective focal length of the seventh lens L7.
  • f3/f1 1.317; f1 is the effective focal length of the first lens L1, and f3 is the effective focal length of the third lens L3.
  • Both the first lens L1 and the third lens L3 provide positive refractive power to the optical system 10, and when the above relationship is satisfied, the effective focal lengths of the first lens L1 and the third lens L3 can be reasonably controlled, thereby balancing the first lens L1 to avoid excessive spherical aberration due to the excessive concentration of the refractive power in the first lens L1.
  • 87;
  • CT6 is the thickness of the sixth lens L6 on the optical axis, and
  • SAG61 is the sag of the object side surface S11 of the sixth lens L6 at the maximum effective aperture.
  • the center thickness of the sixth lens L6 and the edge sag of the object side surface S11 can be mutually constrained, so as to reduce the surface complexity of the object side surface S11, and further facilitate the manufacture and molding of the sixth lens L6 , which reduces the defect of poor lens molding; and can also trim the field curvature generated by each lens on the object side, so as to promote the balance of the field curvature of the optical system 10 and improve the imaging quality of the optical system 10 .
  • the sag of the lens surface at the maximum effective aperture is the distance from the intersection of the surface and the optical axis to the maximum effective aperture in the direction parallel to the optical axis 101 .
  • V3+V4)/V5 5.19;
  • V3 is the Abbe number of the third lens L3 under d light,
  • V4 is the Abbe number of the fourth lens L4 under d light, and
  • V5 is the fifth lens L5 under d light the Abbe number.
  • R10/R11 0.654;
  • R10 is the radius of curvature of the object side S9 of the fifth lens L5 at the optical axis, and R11 is the radius of curvature of the image side S10 of the fifth lens L5 at the optical axis.
  • 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). It can be seen from the longitudinal spherical aberration diagram that in the first embodiment, the degree of deviation of the converging focus of each wavelength light tends to be the same, and the smear or color halo in the imaging picture is effectively suppressed.
  • 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 587.56 nm, and the T curve represents the meridional field curvature at 587.56 nm. It can be seen from the figure that the field curvature of the optical system 10 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 optical system 10 is excellent.
  • the optical system 10 sequentially includes an aperture stop STO, a first lens L1 with positive refractive power, and a first lens with negative refractive power from the object side to the image side along the optical axis 101 .
  • FIG. 4 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the second embodiment.
  • the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the object side S1 is convex near the circumference, and the image side S2 is convex near the circumference.
  • the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; the object side S3 is concave near the circumference, and the image side S4 is convex near the circumference.
  • the object side S5 of the third lens L3 is concave at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave near the circumference, and the image side S6 is convex near the circumference.
  • the object side S7 of the fourth lens L4 is concave at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave near the circumference, and the image side S8 is convex near the circumference.
  • the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis; the object side S9 is concave near the circumference, and the image side S10 is convex near the circumference.
  • the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 is concave near the circumference, and the image side S12 is convex near the circumference.
  • the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis; the object side S13 is concave near the circumference, and the image side S14 is convex near 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.
  • optical system 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, and a first lens with negative refractive power from the object side to the image side along the optical axis 101.
  • FIG. 6 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the third embodiment.
  • the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the object side S1 is convex near the circumference, and the image side S2 is convex near the circumference.
  • the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; the object side S3 is concave near the circumference, and the image side S4 is convex near the circumference.
  • the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave near the circumference, and the image side S6 is convex near the circumference.
  • the object side S7 of the fourth lens L4 is concave at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave near the circumference, and the image side S8 is convex near the circumference.
  • the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis; the object side S9 is concave near the circumference, and the image side S10 is concave near the circumference.
  • the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 is concave near the circumference, and the image side S12 is convex near the circumference.
  • the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis; the object side S13 is concave near the circumference, and the image side S14 is convex near 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.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes an aperture stop STO, a first lens L1 with a positive refractive power, and a first lens with a negative refractive power from the object side to the image side along the optical axis 101 in sequence.
  • FIG. 8 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the fourth embodiment.
  • the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the object side S1 is convex near the circumference, and the image side S2 is convex near the circumference.
  • the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; the object side S3 is concave near the circumference, and the image side S4 is convex near the circumference.
  • the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave near the circumference, and the image side S6 is convex near the circumference.
  • the object side S7 of the fourth lens L4 is concave at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave near the circumference, and the image side S8 is convex near the circumference.
  • the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis; the object side S9 is concave near the circumference, and the image side S10 is concave near the circumference.
  • the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 is concave near the circumference, and the image side S12 is convex near the circumference.
  • the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis; the object side S13 is concave near the circumference, and the image side S14 is convex near 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.
  • optical system 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, and a first lens with negative refractive power from the object side to the image side along the optical axis 101 .
  • 10 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the fifth embodiment.
  • the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the object side S1 is convex near the circumference, and the image side S2 is concave near the circumference.
  • the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; the object side S3 is concave near the circumference, and the image side S4 is concave near the circumference.
  • the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave near the circumference, and the image side S6 is convex near the circumference.
  • the object side S7 of the fourth lens L4 is concave at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave near the circumference, and the image side S8 is convex near the circumference.
  • the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis; the object side S9 is concave near the circumference, and the image side S10 is concave near the circumference.
  • the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 is concave near the circumference, and the image side S12 is convex near the circumference.
  • the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis; the object side S13 is concave near the circumference, and the image side S14 is convex near 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, which will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 includes an aperture stop STO, a first lens L1 with a positive refractive power, and a first lens with a negative refractive power from the object side to the image side along the optical axis 101.
  • FIG. 12 includes longitudinal spherical aberration diagrams, astigmatism diagrams, and distortion diagrams of the optical system 10 in the sixth embodiment.
  • the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis; the object side S1 is convex near the circumference, and the image side S2 is concave near the circumference.
  • the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is concave at the near optical axis; the object side S3 is concave near the circumference, and the image side S4 is concave near the circumference.
  • the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is convex at the near optical axis; the object side S5 is concave near the circumference, and the image side S6 is convex near the circumference.
  • the object side S7 of the fourth lens L4 is concave at the near optical axis, and the image side S8 is convex at the near optical axis; the object side S7 is concave near the circumference, and the image side S8 is convex near the circumference.
  • the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis; the object side S9 is concave near the circumference, and the image side S10 is concave near the circumference.
  • the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 is concave near the circumference, and the image side S12 is convex near the circumference.
  • the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis; the object side S13 is concave near the circumference, and the image side S14 is convex near 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, which will not be repeated here.
  • optical system 10 in this embodiment satisfies the following relationship:
  • the optical system 10 in the above-mentioned first to sixth embodiments through the reasonable combination design of the features of the seven lenses, such as refractive power, structure and parameter relationship, can make the lenses thin and miniaturized.
  • the aberration of 10 achieves excellent correction, and effectively reduces the incident angle of the marginal field of view light on the imaging surface S15, alleviates the problem of vignetting around the image in a large field of view, and maintains high-pixel imaging quality.
  • the camera module 20 may include an optical system 10 and an image sensor 210 , and the image sensor 210 is disposed on the image side of the optical system 10 .
  • the image sensor 210 may be a CCD sensor (Charge Coupled Device, charge coupled device) or a CMOS sensor (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor).
  • CCD sensor Charge Coupled Device, charge coupled device
  • CMOS sensor Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor
  • the axial size of the camera module 20 can be compressed to achieve a miniaturized design, and at the same time, a larger field of view can be obtained, and it is also beneficial to achieve a balance of spherical aberration and alleviate the large field of view.
  • the electronic device 30 includes a fixing member 310 , and the camera module 20 is mounted on the fixing member 310 , and the fixing member 310 may be a display screen, 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, a 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 can assemble the camera module 20 in a smaller space.
  • the axial size of the camera module can be compressed and it has good imaging quality, it is also beneficial for the device to have A slim design with good shooting quality.
  • the "electronic device” 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), 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 broadcast 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/transmit 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: 正的第一透镜(L1); 负的第二透镜(L2)，其物侧面(S3)于近光轴处为凸面; 正的第三透镜(L3)，其像侧面(S6)于近光轴处为凸面; 第四透镜(L4)，其物侧面(S7)于近光轴处为凹面，像侧面(S8)于近光轴处为凸面; 负的第五透镜(L5)，其物侧面(S9)于近光轴处为凹面，像侧面(S10)于近光轴处为凸面; 正的第六透镜(L6)，其物侧面(S11)于近光轴处为凸面; 负的第七透镜(L7)，其物侧面(S13)于近光轴处为凸面; 光学系统(10)满足: 1.2＜f234/f1＜2.5; f234为第二、第三和第四透镜的组合焦距，f1为第一透镜(L1)的有效焦距。

Description

光学系统、摄像模组及电子设备 技术领域
本发明涉及摄影成像技术领域，特别是涉及一种光学系统、摄像模组及电子设备。
背景技术
随着市场对电子设备的小型化追求逐渐增大，如何减小设备中各种模组的尺寸以减少其于设备中的占据空间，已然成为了业界在设计小型化设备时所关注的重点之一。
但对于一般的摄像模组而言，虽然可通过增加透镜数量以更好地提升成像质量，但往往也会导致模组的轴向尺寸难以得到减小，难以实现小型化设计，而若通过直接压缩透镜间距、减少透镜数量等方法压缩模组尺寸，则又会导致成像质量发生严重的不良。
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，沿光轴由物侧至像侧依次包括：
具有正屈折力的第一透镜；
具有负屈折力的第二透镜，所述第二透镜的物侧面于近光轴处为凸面；
具有正屈折力的第三透镜，所述第三透镜的像侧面于近光轴处为凸面；
具有屈折力的第四透镜，所述第四透镜的物侧面于近光轴处为凹面，像侧面于近光轴处为凸面；
具有负屈折力的第五透镜，所述第五透镜的物侧面于近光轴处为凹面，像侧面于近光轴处为凸面；
具有正屈折力的第六透镜，所述第六透镜的物侧面于近光轴处为凸面，且于近最大有效孔径处为凹面；
具有负屈折力的第七透镜，所述第七透镜的物侧面于近光轴处为凸面；
所述光学系统满足关系条件：
1.2＜f234/f1＜2.5；
f234为所述第二透镜、所述第三透镜和所述第四透镜的组合焦距，f1为所述第一透镜的有效焦距。
一种摄像模组，包括图像传感器及上述任意一项所述的光学系统，所述图像传感器设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，本申请的实施例提供了一种具有七片式结构的光学系统10，光学系统10沿光轴101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。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101。光学系统10中的上述各光学元件以及暂未提及的光阑可与镜筒装配以构成摄像镜头。
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视为图像传感器的感光表面。
在本申请的实施例中，第一透镜L1具有正屈折力；第二透镜L2具有负屈折力，其物侧面S3于近光轴处为凸面；第三透镜L3具有正屈折力，其像侧面S6于近光轴处为凸面；第四透镜L4具有正屈折力或负屈折力，其物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；第五透镜L5具有负屈折力，其物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；第六透镜L6具有正屈折力，其物侧面S11于近光轴处为凸面，且于近最大有效孔径处为凹面，即于近圆周处为凹面；第七透镜L7具有负屈折力，其物侧面S13于近光轴处为凸面。应注意的是，当本申请的实施例在描述透镜的一个表面于近光轴处为凸面时，可理解为该透镜的该表面于光轴101附近的区域为凸面；当描述透镜的一个表面于近最大有效孔径处或于近圆周处为凹面时，可理解为该表面在靠近最大有效孔径处的区域为凹面。举例而言，当该表面于近光轴处为凸面，且于近圆周处也为凸面时，该表面由中心(光轴101处)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。本申请中的凹凸面型描述仅针对相应透镜表面的有效通光区域的面型。
上述由物侧至像侧分配的各透镜的屈折力及面型搭配合理，从而能够良好地校正像差，以提高光学系统10的成像质量，同时也有利于压缩光学系统10于光轴方向上的尺寸。其中通过正负屈折力循环的方式配置多片透镜，可利于各透镜所产生的像差被依次且平稳地校正，可较好的避免校正不足或过度校正的问题。特别地，通过使第六透镜L6的物侧面S11满足上述面型设置，可有效抑制边缘视场的光线的偏折，即减小边缘视场的光线于光学系统10的成像面S15上的入射角度，从而有利于缓解大视场下的边缘成像出现暗角问题；同时还可有效改善球差，并对离轴的彗差与像散进行良好矫正。
在本申请的实施例中，光学系统10还满足关系：1.2＜f234/f1＜2.5；f234为第二透镜L2、第三透镜L3和第四透镜L4的组合焦距，f1为第一透镜L1的有效焦距。
拥有上述七片式结构设计的光学系统10，当进一步满足上述关系条件时，第二透镜L2、第三透镜L3以及第四透镜L4的组合焦距能够与第一透镜L1的有效焦距之间得到合理的约束，一方面可加强光 学系统10对入射光线的会聚能力，从而有利于缩短光学系统10的总长，同时也可获得较大的视场角；另一方面，正负透镜组合可抵消彼此产生的球差等像差缺陷，第一透镜L1提供的正屈折力和第二透镜L2提供的负屈折力也可促使光学系统10的球差的平衡，实现良好的成像品质。当f234/f1≥2.5时，第一透镜L1至第四透镜L4所构成的前组透镜的等效正屈折力过强，从而导致第五透镜L5至第七透镜L7所构成的后组透镜修正像差能力不足，产生高阶像差，影响光学系统10的成像品质。当f234/f≤1.2时，前组透镜的等效正屈折力不足，难以缩短光学系统10的总长，不利于光学系统10的小型化设计。进一步地，当光学系统10满足关系1.399≤f234/f1≤2.263时，上述效果将更为显著。在一些实施例中，光学系统10所满足的该关系具体可以为1.4、1.43、1.47、1.55、1.6、1.8、1.9、2.05、2.15、2.2或2.25。
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技术效果：
-5.0＜(R12+R13)/(R12-R13)＜0；R12为第六透镜L6的物侧面S11于光轴处的曲率半径，R13为第六透镜L6的像侧面S12于光轴处的曲率半径。满足上述面型配置及关系式条件时，第六透镜L6的物侧面S11和像侧面S12于光轴处的曲率半径能够得到合适的配置，从而可良好地控制第六透镜L6物侧面S11与像侧面S12的面型，以有效减小边缘视场的光线于成像面S15上的入射角度，进一步缓解大视场条件下影像周边易产生暗角的问题。在一些实施例中，光学系统10所满足的该关系具体可以为-4.2、-4、-3.8、-3.5、-3、-2.5、-2、-1.5、-1.2、-1、-0.9或-0.75。
0.4＜T12/CT1＜0.65；T12为第一透镜L1的像侧面S2至第二透镜L2的物侧面S3于光轴上的距离，CT1为第一透镜L1于光轴上的厚度。满足上述关系时，第一透镜L1的厚度能够被合理控制，且第一透镜L1与第二透镜L2间具有合适的装配空间，从而有利于第一透镜L1的制作与组装，并有利于维持透镜的小型化特性，进而便于实现光学系统10的小型化。在一些实施例中，光学系统10所满足的该关系具体可以为0.47、0.48、0.5、0.52、0.54、0.56、0.58、0.6或0.62。
0.58＜(T45+CT5)/(CT3+CT4)＜0.95；T45为第四透镜L4的像侧面S8至第五透镜L5的物侧面S9于光轴上的距离，CT3为第三透镜L3于光轴上的厚度，CT4为第四透镜L4于光轴上的厚度，CT5为第五透镜L5于光轴上的厚度。满足上述关系时，可使光学系统10中的透镜组的配置更为紧凑，进而可以有效缩短光学系统10的轴向尺寸，从而维持了光学系统10的小型化设计。在一些实施例中，光学系统10所满足的该关系具体可以为0.6、0.62、0.65、0.7、0.75、0.8、0.83、0.85、0.87或0.89。
1.3＜TTL/ImgH＜1.5；TTL为第一透镜L1的物侧面S1至光学系统10的成像面S15于光轴上的距离，ImgH为光学系统10的最大视场角所对应的像高的一半。当装配图像传感器后，Imgh也可理解为图像传感器的矩形有效像素区域的中心至对角线边缘的距离，且上述有效成像区域的对角线方向平行于该矩形有效像素区域的对角线方向。满足上述条件时，拥有上述七片式设计的光学系统10将拥有大像面特性，从而可匹配高像素的图像传感器，进而可满足高质量成像效果；也可有效减小光学系统10的总长度，从而实现光学系统10于光轴方向上的小尺寸设计。当高于关系式上限时，光学系统10难以拥有大像面特性，且系统总长也难以得到有效压缩，不利于小型化设计。当低于关系式下限时，光学系统10的最大视场角所对应的像高过大，即像面尺寸过大，容易导致影像周边的暗角现象过于明显。在一些实施例中，光学系统10所满足的该关系具体可以为1.40、1.41、1.43、1.44、1.46或1.47。
-0.7＜f/f7＜-0.3；f为光学系统10的有效焦距，f7为第七透镜L7的有效焦距。满足上述关系时，有助于使光学系统10的主点靠近成像面S15，此时第七透镜L7屈折力增大，导致第七透镜L7面型弯曲，从而有利于缩短光学系统10的后焦距以维持小型化，且同时第七透镜L7的屈折力强度合适，可降低物方各透镜的设计复杂度，进而可降低光学系统10中透镜组的公差敏感度。低于关系式下限时，第七透镜L7的负屈折力过强，难以缩短光学系统10的长度。当高于关系式上限时，又会导致第七透镜L7的屈折力强度不足，难以对物方透镜所产生的像差进行合理校正。在一些实施例中，光学系统10所满足的该关系具体可以为-0.6、-0.58、-0.55、-0.5、-0.46、-0.4、-0.38或-0.36。
0.8＜f3/f1＜1.8；f1为第一透镜L1的有效焦距，f3为第三透镜L3的有效焦距。第一透镜L1和第三透镜L3均为光学系统10提供正屈折力，且当满足上述关系时，第一透镜L1和第三透镜L3的有 效焦距能够得到合理控制，从而可平衡第一透镜L1的正屈折力，以避免屈折力因过度集中于第一透镜L1而使球差过度增大，导致光学系统10的成像品质降低。在一些实施例中，光学系统10所满足的该关系具体可以为0.93、0.95、0.97、1、1.12、1.2、1.35、1.44、1.53、1.6、1.63或1.66。
7.0＜CT6/|SAG61|＜88.0；CT6为第六透镜L6于光轴上的厚度，SAG61为第六透镜L6的物侧面S11于最大有效孔径处的矢高。满足上述关系时，能够使第六透镜L6的中心厚度与物侧面S11的边缘矢高之间相互约束，以利于降低该物侧面S11的面型复杂度，进而有利于第六透镜L6的制造及成型，减少了透镜的成型不良的缺陷；还能够修整物方各透镜所产生的场曲，以促使系统场曲的平衡，提高光学系统10的成像质量。应注意的是，透镜表面于最大有效孔径处的矢高为该表面与光轴的交点至该最大有效孔径处于平行光轴101方向的距离。在一些实施例中，光学系统10所满足的该关系具体可以为7.8、8、8.5、8.74、9、10.4、12.6、13.5、14.5、25、55、75、80或85。
3.0＜(V3+V4)/V5＜6.0；V3为第三透镜L3于d光下的阿贝数，V4为第四透镜L4于d光下的阿贝数，V5为第五透镜L5于d光下的阿贝数。当满足上述关系时，可控制光线通过第三透镜L3、第四透镜L4以及第五透镜L5的偏折程度，有利于强化透镜像差修正能力，且能抑制光线经过这些透镜时产生的色散问题，从而平衡光学系统10的色差。在一些实施例中，光学系统10所满足的该关系具体可以为3.9、3.95、4、4.05、4.3、4.6、4.8、5、5.04、5.1、5.13或5.17。
0.3＜R10/R11＜0.8；R10为第五透镜L5的物侧面S9于光轴处的曲率半径，R11为第五透镜L5的像侧面S10于光轴处的曲率半径。满足上述关系时，可合理约束第五透镜L5的物侧面S9与像侧面S10曲率半径之间的关系，从而能有效分配透镜承担的光线偏折角，同时可以改善轴外视场像散，使成像面S15更平坦，进而提高光学系统10的成像质量。在一些实施例中，光学系统10所满足的该关系具体可以为0.42、0.45、0.48、0.53、0.6、0.64、0.67、0.69或0.71。
3.0＜|f7|/R14＜9.0；f7为第七透镜L7的有效焦距，R14为第七透镜L7的物侧面S13于光轴处的曲率半径。满足上述关系时，可合理配置第七透镜L7的有效焦距和物侧面S13于光轴处的曲率半径之间的关系，减小光线于图像传感器上的入射角度，从而使光学系统10能够更好地与常见的图像传感器匹配，同时也可避免严重的鬼像杂光的产生。在一些实施例中，光学系统10所满足的该关系具体可以为4.0、4.15、4.37、4.8、5.2、5.45、6、6.75、7.44、7.68、7.89或8.05。
上述各关系式条件中涉及焦距、折射率、阿贝数的参数的参考波长均为587.6nm，即d光波长。另外，上述各焦距参数至少代表相应透镜于近光轴处的焦距。
以上各关系式条件及其所带来的技术效果针对的是具有上述透镜设计的七片式光学系统10。在无法确保前述光学系统10的透镜设计(透镜数量、屈折力配置、面型配置等)时，将难以确保光学系统10在满足这些关系条件时依然能够拥有相应的技术效果，甚至会出现摄像性能显著下降的可能。
光学系统10包括孔径光阑STO，孔径光阑STO用于控制光学系统10的进光量，并同时能够起到阻挡非有效光线的作用。当孔径光阑STO在光轴101上的投影与第一透镜L1的物侧面S1于光轴101上的投影重叠时，也可认为是孔径光阑STO设于第一透镜L1的物侧，此时第一透镜L1的物侧面S1的至少部分区域朝物方穿过孔径光阑STO。孔径光阑STO可设于第一透镜L1的物侧，也可设于第一透镜L1至第七透镜L7中的其中两个相邻透镜之间。孔径光阑STO可以由夹持透镜的镜筒结构形成，也可以是单独装配至透镜和镜筒之间的垫圈。
在一些实施例中，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，即第一透镜L1至第七透镜L7中的至少一者具有非球面面型。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中至少一者的物侧面及/或像侧面也可以为球面。应注意的是，透镜的实际面型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。另外还应注意的是，当某个透镜的物侧面或像侧面为非球面时，该面可以是整体呈现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。具体地，本申 请中第六透镜L6的物侧面S11即存在反曲点。此处仅为说明近光轴处与圆周处的关系而做出的示例，任一透镜的任一表面的具体面型结构(凹凸关系)可以为多样，并不限于上述示例。
非球面的面型计算可参考非球面公式：
Figure PCTCN2021076027-appb-000001
其中，Z为非球面上相应点到该面于光轴处的切平面的距离，r为非球面上相应点到光轴的距离，c为非球面于光轴处的曲率，k为圆锥系数，Ai为非球面面型公式中与第i阶高次项相对应的高次项系数。
另一方面，在一些实施例中，光学系统10中各透镜的材质均为塑料。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光学系统10的光学性能与成本。在一些实施例中，第一透镜L1至第七透镜L7中至少一者的材质为塑料，且至少一者的材质为玻璃。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，防止红外光到达光学系统10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，红外截止滤光片110可以在光学系统10与图像传感器装配时，一并安装至光学系统10与图像传感器之间。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。
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沿光轴101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，且以下各实施例中的像散图和畸变图的参考波长均为587.56nm。
第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；物侧面S1于近圆周处为凸面，像侧面S2于近圆周处为凸面。
第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；物侧面S3于近圆周处为凹面，像侧面S4于近圆周处为凸面。
第三透镜L3的物侧面S5于近光轴处为凹面，像侧面S6于近光轴处为凸面；物侧面S5于近圆周处为凹面，像侧面S6于近圆周处为凸面。
第四透镜L4的物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；物侧面S7于近圆周处为凹面，像侧面S8于近圆周处为凸面。
第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；物侧面S9于近圆周处为凹面，像侧面S10于近圆周处为凸面。
第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凸面；物侧面S11于近圆 周处为凹面，像侧面S12于近圆周处为凸面。
第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面；物侧面S13于近圆周处为凹面，像侧面S14于近圆周处为凸面。
上述由物侧至像侧分配的各透镜的屈折力及面型搭配合理，从而能够良好地校正像差，以提高光学系统10的成像质量，同时也有利于压缩光学系统10于光轴方向上的尺寸。其中通过正负屈折力循环的方式配置多片透镜，可利于各透镜所产生的像差被依次且平稳地校正，可较好的避免校正不足或过校正的问题。特别地，通过使第六透镜L6的物侧面S11满足上述面型设置，可有效抑制边缘视场的光线偏折，即减小边缘视场的光线于光学系统10的成像面S15上的入射角，从而有利于缓解大视场下的边缘成像出现暗角问题；同时还可有效改善球差，并对离轴的彗差与像散进行良好矫正。
该实施例中光学系统10的各透镜参数由以下的表1和表2给出。表2展现了表1中相应透镜表面的非球面系数，其中K为圆锥系数，Ai为非球面面型公式中与第i阶高次项相对应的系数。由光学系统10的物侧至像侧的各元件依次按照表1从上至下的顺序排列。表格中的光阑即为孔径光阑STO，红外滤光片为红外截止滤光片110。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。Y半径为透镜相应表面于光轴处的曲率半径。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表面(如后一透镜的物侧面或光阑面)于光轴上的距离，光阑于“厚度”参数中的数值代表光阑面至后一光学元件的物侧面于光轴上的距离。表格中的红外滤光片为红外截止滤光片。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587.6nm，且Y半径、厚度、焦距(有效焦距)的数值单位均为毫米(mm)。另外，各实施例的关系式计算和透镜结构以参数表格(如表1、表2、表3、表4等)所提供的数据为准。
表1
Figure PCTCN2021076027-appb-000002
由表1可知，光学系统10的有效焦距f为4.25mm，光圈数FNO为2.2，最大视场角的一半HFOV为43.7°，光学总长TTL为6.0mm。图像传感器的矩形有效像素区域具有对角线方向，当装配图像传感器时，HFOV也可理解为光学系统10于平行该对角线方向的最大视场角的一半。
第一透镜L1至第七透镜L7的材质均为塑料，且各透镜的物侧面和像侧面均为非球面。
表2
Figure PCTCN2021076027-appb-000003
在第一实施例中，光学系统10还满足以下各关系：
f234/f1＝1.986；f234为第二透镜L2、第三透镜L3和第四透镜L4的组合焦距，f1为第一透镜L1的有效焦距。
拥有上述七片式结构设计的光学系统10，当进一步满足上述关系条件时，第二透镜L2、第三透镜L3以及第四透镜L4的组合焦距能够与第一透镜L1的有效焦距之间得到合理的约束，一方面可加强光学系统10对入射光线的会聚能力，从而有利于缩短光学系统10的总长，同时也可获得较大的视场角；另一方面，正负透镜组合可抵消彼此产生的球差等像差缺陷，第一透镜L1提供的正屈折力和第二透镜L2提供的负屈折力也可促使光学系统10的球差平衡，实现良好的成像品质。
(R12+R13)/(R12-R13)＝-0.733；R12为第六透镜L6的物侧面S11于光轴处的曲率半径，R13为第六透镜L6的像侧面S12于光轴处的曲率半径。满足上述面型配置及关系式条件时，第六透镜L6的物侧面S11和像侧面S12于光轴处的曲率半径能够得到合适的配置，从而可良好地控制第六透镜L6物侧面S11与像侧面S12的面型，以有效减小边缘视场的光线于成像面S15上的入射角，进一步缓解大视场条件下影像周边易产生暗角的问题。
T12/CT1＝0.574；T12为第一透镜L1的像侧面S2至第二透镜L2的物侧面S3于光轴上的距离，CT1为第一透镜L1于光轴上的厚度。满足上述关系时，第一透镜L1的厚度能够被合理控制，且第一透镜 L1与第二透镜L2间具有合适的装配空间，从而有利于第一透镜L1的制作与组装，并维持透镜的小型化特性。
(T45+CT5)/(CT3+CT4)＝0.893；T45为第四透镜L4的像侧面S8至第五透镜L5的物侧面S9于光轴上的距离，CT3为第三透镜L3于光轴上的厚度，CT4为第四透镜L4于光轴上的厚度，CT5为第五透镜L5于光轴上的厚度。满足上述关系时，可使光学系统10中的透镜组的配置更为紧凑，以有效缩短光学系统10的轴向尺寸，维持光学系统10的小型化设计。
TTL/ImgH＝1.435；TTL为第一透镜L1的物侧面S1至光学系统10的成像面S15于光轴上的距离，ImgH为光学系统10的最大视场角所对应的像高的一半。当装配图像传感器后，Imgh也可理解为图像传感器的矩形有效像素区域的中心至对角线边缘的距离，且上述有效成像区域的对角线方向平行于该矩形有效像素区域的对角线方向。满足上述条件时，拥有上述七片式设计的光学系统10将拥有大像面特性，从而可匹配高像素的图像传感器，进而可满足高质量成像效果；也可有效减小光学系统10的总长度，从而实现光学系统10于光轴方向上的小尺寸设计。
f/f7＝-0.63；f为光学系统10的有效焦距，f7为第七透镜L7的有效焦距。满足上述关系时，有助于使光学系统10的主点靠近成像面S15，从而有利于缩短光学系统10的后焦距以维持小型化，且同时第七透镜L7的屈折力强度合适，可降低物方各透镜的设计复杂度，进而可降低光学系统10中透镜组的公差敏感度。
f3/f1＝1.317；f1为第一透镜L1的有效焦距，f3为第三透镜L3的有效焦距。第一透镜L1和第三透镜L3均为光学系统10提供正屈折力，且当满足上述关系时，第一透镜L1和第三透镜L3的有效焦距能够得到合理控制，从而可平衡第一透镜L1的正屈折力，以避免屈折力因过度集中于第一透镜L1而使球差过度增大。
CT6/|SAG61|＝87；CT6为第六透镜L6于光轴上的厚度，SAG61为第六透镜L6的物侧面S11于最大有效孔径处的矢高。满足上述关系时，能够使第六透镜L6的中心厚度与物侧面S11的边缘矢高之间相互约束，以利于降低该物侧面S11的面型复杂度，进而有利于第六透镜L6的制造及成型，减少了透镜的成型不良的缺陷；还能够修整物方各透镜所产生的场曲，以促使光学系统10的场曲平衡，提高光学系统10的成像质量。应注意的是，透镜表面于最大有效孔径处的矢高为该表面与光轴的交点至该最大有效孔径处于平行光轴101方向的距离。
(V3+V4)/V5＝5.19；V3为第三透镜L3于d光下的阿贝数，V4为第四透镜L4于d光下的阿贝数，V5为第五透镜L5于d光下的阿贝数。当满足上述关系时，可控制光线通过第三透镜L3、第四透镜L4以及第五透镜L5的偏折程度，有利于强化透镜像差修正能力，且能抑制光线经过这些透镜时产生的色散问题，从而平衡光学系统10的色差。
R10/R11＝0.654；R10为第五透镜L5的物侧面S9于光轴处的曲率半径，R11为第五透镜L5的像侧面S10于光轴处的曲率半径。满足上述关系时，可合理约束第五透镜L5的物侧面S9与像侧面S10曲率半径之间的关系，从而能有效分配透镜承担的光线偏折角，同时改善轴外视场像散，使成像面S15更平坦，进而提高光学系统10的成像质量。
|f7|/R14＝3.968；f7为第七透镜L7的有效焦距，R14为第七透镜L7的物侧面S13于光轴处的曲率半径。满足上述关系时，可合理配置第七透镜L7的有效焦距和物侧面S13于光轴处的曲率半径之间的关系，减小光线于图像传感器上的入射角，从而使光学系统10能够更好地与常见的图像传感器匹配，同时也可避免严重的鬼像杂光的产生。
另外，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587.56nm下的弧矢场曲，T曲线代表587.56nm下的子午场曲。由图中可知，光学系统10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，光学系统10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沿光轴101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。
第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；物侧面S1于近圆周处为凸面，像侧面S2于近圆周处为凸面。
第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；物侧面S3于近圆周处为凹面，像侧面S4于近圆周处为凸面。
第三透镜L3的物侧面S5于近光轴处为凹面，像侧面S6于近光轴处为凸面；物侧面S5于近圆周处为凹面，像侧面S6于近圆周处为凸面。
第四透镜L4的物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；物侧面S7于近圆周处为凹面，像侧面S8于近圆周处为凸面。
第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；物侧面S9于近圆周处为凹面，像侧面S10于近圆周处为凸面。
第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凹面；物侧面S11于近圆周处为凹面，像侧面S12于近圆周处为凸面。
第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面；物侧面S13于近圆周处为凹面，像侧面S14于近圆周处为凸面。
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 PCTCN2021076027-appb-000004
Figure PCTCN2021076027-appb-000005
表4
Figure PCTCN2021076027-appb-000006
该实施例中的光学系统10满足以下关系：
f234/f1 1.57 f3/f1 1.178
(R12+R13)/(R12-R13) -1.112 CT6/|SAG61| 8.06
T12/CT1 0.633 (V3+V4)/V5 5.19
(T45+CT5)/(CT3+CT4) 0.899 R10/R11 0.646
TTL/ImgH 1.471 |f7|/R14 5.338
f/f7 -0.509    
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沿光轴101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。
第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；物侧面S1于近圆周处为凸面，像侧面S2于近圆周处为凸面。
第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；物侧面S3于近圆周处为凹面，像侧面S4于近圆周处为凸面。
第三透镜L3的物侧面S5于近光轴处为凸面，像侧面S6于近光轴处为凸面；物侧面S5于近圆周处为凹面，像侧面S6于近圆周处为凸面。
第四透镜L4的物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；物侧面S7于近圆周处为凹面，像侧面S8于近圆周处为凸面。
第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；物侧面S9于近圆周处为凹面，像侧面S10于近圆周处为凹面。
第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凹面；物侧面S11于近圆周处为凹面，像侧面S12于近圆周处为凸面。
第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面；物侧面S13于近圆周处为凹面，像侧面S14于近圆周处为凸面。
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 PCTCN2021076027-appb-000007
表6
Figure PCTCN2021076027-appb-000008
Figure PCTCN2021076027-appb-000009
该实施例中的光学系统10满足以下关系：
f234/f1 1.448 f3/f1 0.917
(R12+R13)/(R12-R13) -2.714 CT6/|SAG61| 8.43
T12/CT1 0.539 (V3+V4)/V5 5.19
(T45+CT5)/(CT3+CT4) 0.85 R10/R11 0.652
TTL/ImgH 1.459 |f7|/R14 8.093
f/f7 -0.366    
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沿光轴101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。
第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；物侧面S1于近圆周处为凸面，像侧面S2于近圆周处为凸面。
第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；物侧面S3于近圆周处为凹面，像侧面S4于近圆周处为凸面。
第三透镜L3的物侧面S5于近光轴处为凸面，像侧面S6于近光轴处为凸面；物侧面S5于近圆周处为凹面，像侧面S6于近圆周处为凸面。
第四透镜L4的物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；物侧面S7于近圆周处为凹面，像侧面S8于近圆周处为凸面。
第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；物侧面S9于近圆周处为凹面，像侧面S10于近圆周处为凹面。
第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凹面；物侧面S11于近圆周处为凹面，像侧面S12于近圆周处为凸面。
第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面；物侧面S13于近圆周处为凹面，像侧面S14于近圆周处为凸面。
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 PCTCN2021076027-appb-000010
表8
Figure PCTCN2021076027-appb-000011
Figure PCTCN2021076027-appb-000012
该实施例中的光学系统10满足以下关系：
f234/f1 1.975 f3/f1 0.967
(R12+R13)/(R12-R13) -3.757 CT6/|SAG61| 7.69
T12/CT1 0.504 (V3+V4)/V5 3.8
(T45+CT5)/(CT3+CT4) 0.865 R10/R11 0.406
TTL/ImgH 1.472 |f7|/R14 7.711
f/f7 -0.358    
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沿光轴101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。
第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；物侧面S1于近圆周处为凸面，像侧面S2于近圆周处为凹面。
第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；物侧面S3于近圆周处为凹面，像侧面S4于近圆周处为凹面。
第三透镜L3的物侧面S5于近光轴处为凸面，像侧面S6于近光轴处为凸面；物侧面S5于近圆周处为凹面，像侧面S6于近圆周处为凸面。
第四透镜L4的物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；物侧面S7于近圆周处为凹面，像侧面S8于近圆周处为凸面。
第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；物侧面S9于近圆周处为凹面，像侧面S10于近圆周处为凹面。
第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凹面；物侧面S11于近圆周处为凹面，像侧面S12于近圆周处为凸面。
第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面；物侧面S13于近圆周处为凹面，像侧面S14于近圆周处为凸面。
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 PCTCN2021076027-appb-000013
表10
Figure PCTCN2021076027-appb-000014
Figure PCTCN2021076027-appb-000015
该实施例中的光学系统10满足以下关系：
f234/f1 2.263 f3/f1 0.95
(R12+R13)/(R12-R13) -4.231 CT6/|SAG61| 8.87
T12/CT1 0.464 (V3+V4)/V5 4.02
(T45+CT5)/(CT3+CT4) 0.825 R10/R11 0.721
TTL/ImgH 1.426 |f7|/R14 4.311
f/f7 -0.568    
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沿光轴101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。
第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；物侧面S1于近圆周处为凸面，像侧面S2于近圆周处为凹面。
第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；物侧面S3于近圆周处为凹面，像侧面S4于近圆周处为凹面。
第三透镜L3的物侧面S5于近光轴处为凸面，像侧面S6于近光轴处为凸面；物侧面S5于近圆周处为凹面，像侧面S6于近圆周处为凸面。
第四透镜L4的物侧面S7于近光轴处为凹面，像侧面S8于近光轴处为凸面；物侧面S7于近圆周处为凹面，像侧面S8于近圆周处为凸面。
第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面；物侧面S9于近圆周处为凹面，像侧面S10于近圆周处为凹面。
第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凹面；物侧面S11于近圆周处为凹面，像侧面S12于近圆周处为凸面。
第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面；物侧面S13于近圆周处为凹面，像侧面S14于近圆周处为凸面。
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 PCTCN2021076027-appb-000016
Figure PCTCN2021076027-appb-000017
表12
Figure PCTCN2021076027-appb-000018
该实施例中的光学系统10满足以下关系：
f234/f1 1.399 f3/f1 1.67
(R12+R13)/(R12-R13) -1.575 CT6/|SAG61| 14.2
T12/CT1 0.559 (V3+V4)/V5 4.02
(T45+CT5)/(CT3+CT4) 0.589 R10/R11 0.578
TTL/ImgH 1.388 |f7|/R14 6.847
f/f7 -0.443    
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。
上述第一至第六实施例中的光学系统10，通过七个透镜的屈折力、结构以及参数关系等特征的合理组合设计，可使得镜头实现轻薄化及体积小型化，另外也可对光学系统10的像差实现优良的校正，并有效减小边缘视场光线于成像面S15上的入射角，减缓大视场下影像周边易产生暗角的问题，维持高像素的成像品质。
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传感器(Charge Coupled Device，电荷耦合器件)或CMOS传感器(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的感光表面重叠。
通过采用上述光学系统10，摄像模组20的轴向尺寸能够得到压缩以实现小型化设计，同时也可获得较大的视场角，另外也有利于实现球差的平衡，并缓解大视场下的边缘成像出现暗角问题，从而拥有良好的成像质量。
参考图14，本申请的一些实施例还提供了一种电子设备30。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可以为显示屏、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能够以更小的空间装配摄像模组20，同时由于摄像模组的轴向尺寸能够得到压缩且其具有良好的成像质量，因此也有利于设备在拥有良好拍摄质量的同时实现薄化设计。
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 (20)

  1. 一种光学系统，沿光轴由物侧至像侧依次包括：
    具有正屈折力的第一透镜；
    具有负屈折力的第二透镜，所述第二透镜的物侧面于近光轴处为凸面；
    具有正屈折力的第三透镜，所述第三透镜的像侧面于近光轴处为凸面；
    具有屈折力的第四透镜，所述第四透镜的物侧面于近光轴处为凹面，像侧面于近光轴处为凸面；
    具有负屈折力的第五透镜，所述第五透镜的物侧面于近光轴处为凹面，像侧面于近光轴处为凸面；
    具有正屈折力的第六透镜，所述第六透镜的物侧面于近光轴处为凸面，且于近最大有效孔径处为凹面；
    具有负屈折力的第七透镜，所述第七透镜的物侧面于近光轴处为凸面；
    所述光学系统满足关系条件：
    1.2＜f234/f1＜2.5；
    f234为所述第二透镜、所述第三透镜和所述第四透镜的组合焦距，f1为所述第一透镜的有效焦距。
  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：
    -5.0＜(R12+R13)/(R12-R13)＜0；
    R12为所述第六透镜的物侧面于光轴处的曲率半径，R13为所述第六透镜的像侧面于光轴处的曲率半径。
  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：
    0.4＜T12/CT1＜0.65；
    T12为所述第一透镜的像侧面至所述第二透镜的物侧面于光轴上的距离，CT1为所述第一透镜于光轴上的厚度。
  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：
    0.58＜(T45+CT5)/(CT3+CT4)＜0.95；
    T45为所述第四透镜的像侧面至所述第五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，CT4为所述第四透镜于光轴上的厚度，CT5为所述第五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：
    1.3＜TTL/ImgH＜1.5；
    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为所述光学系统的最大视场角所对应的像高的一半。
  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：
    -0.7＜f/f7＜-0.3；
    f为所述光学系统的有效焦距，f7为所述第七透镜的有效焦距。
  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：
    0.8＜f3/f1＜1.8；
    f3为所述第三透镜的有效焦距。
  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：
    7.0＜CT6/|SAG61|＜88.0；
    CT6为所述第六透镜于光轴上的厚度，SAG61为所述第六透镜的物侧面于最大有效孔径处的矢高。
  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：
    3.0＜(V3+V4)/V5＜6.0；
    V3为所述第三透镜于d光下的阿贝数，V4为所述第四透镜于d光下的阿贝数，V5为所述第五透镜于d光下的阿贝数。
  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：
    0.3＜R10/R11＜0.8；
    R10为所述第五透镜的物侧面于光轴处的曲率半径，R11为所述第五透镜的像侧面于光轴处的曲率 半径。
  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：
    3.0＜|f7|/R14＜9.0；
    f7为所述第七透镜的有效焦距，R14为所述第七透镜的物侧面于光轴处的曲率半径。
  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条件：
    1.399≤f234/f1≤2.263。
  13. 根据权利要求1至12任意一项所述的光学系统，其特征在于，所述第一透镜的物侧面为凸面，像侧面于近光轴处为凹面；所述第二透镜的像侧面于近光轴处为凹面；所述第七透镜的像侧面于近光轴处为凹面。
  14. 根据权利要求1至12任意一项所述的光学系统，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12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的至少一者具有非球面面型。
  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物侧面及像侧面均为非球面。
  17. 根据权利要求1至12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的至少一者的材质为塑料。
  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材质为塑料。
  19. 一种摄像模组，包括图像传感器及权利要求1至18任意一项所述的光学系统，所述图像传感器设于所述光学系统的像侧。
  20. 一种电子设备，包括固定件及权利要求19所述的摄像模组，所述摄像模组设于所述固定件。
PCT/CN2021/076027 2021-02-08 2021-02-08 光学系统、摄像模组及电子设备 WO2022165840A1 (zh)

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