WO2021189431A1 - 光学系统、镜头模组及电子设备 - Google Patents

光学系统、镜头模组及电子设备 Download PDF

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Publication number
WO2021189431A1
WO2021189431A1 PCT/CN2020/081716 CN2020081716W WO2021189431A1 WO 2021189431 A1 WO2021189431 A1 WO 2021189431A1 CN 2020081716 W CN2020081716 W CN 2020081716W WO 2021189431 A1 WO2021189431 A1 WO 2021189431A1
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Prior art keywords
lens
optical system
optical axis
image side
object side
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PCT/CN2020/081716
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English (en)
French (fr)
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党绪文
刘彬彬
李明
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南昌欧菲精密光学制品有限公司
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Priority to PCT/CN2020/081716 priority Critical patent/WO2021189431A1/zh
Publication of WO2021189431A1 publication Critical patent/WO2021189431A1/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 present invention relates to the technical field of optical imaging, in particular to an optical system, a lens module and an electronic device.
  • the purpose of the present invention is to provide an optical system, a lens module and an electronic device, which can have higher imaging quality, can be adapted to electronic photosensitive chips with higher pixels, and can meet the requirements of miniaturization.
  • the present invention provides the following technical solutions:
  • the present invention provides an optical system, which includes a first lens having a positive refractive power from the object side to the image side along the optical axis direction, the object side surface of the first lens is convex, and the first lens
  • the near optical axis of the image side of the lens is a concave surface
  • the second lens has refractive power, the near optical axis of the object side of the second lens is a convex surface, and the near optical axis of the second lens is a concave surface
  • a three-lens lens with refractive power, the object side and image side of the third lens are both aspherical
  • the fourth lens has positive refractive power, and both the object side and the image side of the fourth lens are aspherical
  • the lens has refractive power, the object side and the image side of the fifth lens are aspherical
  • the sixth lens has negative refractive power, the image side of the sixth lens has a concave surface near the optical axis, and the sixth lens
  • the optical system described in the present application can have a higher imaging quality, and at the same time, it can be adapted to higher-pixel electronic photosensitive. Chip, and can meet the requirements of miniaturization.
  • the optical system satisfies the conditional formula: 45.5 ⁇ f*43/ImgH ⁇ 61.0; where f is the effective focal length of the optical system, and ImgH is the effective imaging area of the optical system on the imaging surface The length of the diagonal.
  • the optical system satisfies the conditional formula: 0.89 ⁇ TTL/f ⁇ 1.0; wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, f Is the effective focal length of the optical system.
  • TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis
  • f Is the effective focal length of the optical system.
  • the optical system satisfies the conditional formula: 5.5°/mm ⁇ FOV/f ⁇ 8.2°/mm; where FOV is the diagonal field of view of the optical system, and f is the optical system Effective focal length.
  • the optical system satisfies the conditional formula: 1.9 ⁇ (
  • the optical system satisfies the conditional formula: 3.3 ⁇ R51/CT56 ⁇ 28.7; wherein R51 is the radius of curvature of the object side surface of the fifth lens at the optical axis, and CT56 is the radius of curvature of the fifth lens The separation distance between the image side surface and the object side surface of the sixth lens on the optical axis.
  • the optical system satisfies the conditional formula: 1.2 ⁇ (CT1+CT2+CT3)/BF ⁇ 2.1; where CT1 is the thickness of the first lens on the optical axis, and CT2 is the second lens The thickness of the lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and BF is the closest distance from the image side surface of the sixth lens to the imaging surface along the optical axis.
  • the optical system satisfies the conditional formula: 1.0 ⁇ SAG61/CT6 ⁇ 2.9; wherein, SAG61 is the intersection of the object side surface of the sixth lens with the optical axis, and the distance from the surface to the imaging surface along the optical axis The axial distance between the furthest points, CT6 is the thickness of the sixth lens on the optical axis.
  • the optical system satisfies the conditional formula:
  • CT34 is the distance between the image side of the third lens and the object side of the fourth lens on the optical axis
  • CT45 is the distance between the image side of the fourth lens and the fifth lens.
  • the separation distance between the object side surface of the lens and the optical axis, CT56 is the separation distance between the image side surface of the fifth lens and the object side surface of the sixth lens on the optical axis.
  • the spherical aberration and chromatic aberration generated by the front lens group can be effectively balanced, thereby improving the overall image quality.
  • the optical system satisfies the conditional formula: 2.7mm ⁇ TTL/FNO ⁇ 3.1mm; where 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 aperture number of the optical system.
  • the present invention also provides a lens module that includes a lens barrel and the optical system in any one of the embodiments of the first aspect, and the first lens of the optical system is connected to the
  • the sixth lens is installed in the lens barrel, and the electronic photosensitive chip is arranged on the image side of the optical system for incident on the electronic photosensitive chip through the first lens to the sixth lens
  • the light on the object is converted into an electrical signal of the image.
  • the present invention also provides an electronic device including a housing and the lens module of the second aspect, and the lens module is provided in the housing.
  • the electronic device has a higher imaging quality, and at the same time, the overall length of the electronic device is small, which realizes miniaturization.
  • Fig. 1a is a schematic diagram of the structure of the optical system of the first embodiment
  • Figure 1b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the first embodiment
  • 2a is a schematic diagram of the structure of the optical system of the second embodiment
  • Fig. 2b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the second embodiment
  • 3a is a schematic diagram of the structure of the optical system of the third embodiment
  • Fig. 3b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the third embodiment
  • 4a is a schematic diagram of the structure of the optical system of the fourth embodiment
  • 4b is a longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fourth embodiment
  • 5a is a schematic diagram of the structure of the optical system of the fifth embodiment
  • Fig. 5b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fifth embodiment
  • Fig. 6a is a schematic diagram of the structure of the optical system of the sixth embodiment.
  • Fig. 6b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the sixth embodiment.
  • Fig. 7a is a schematic structural diagram of an optical system of a seventh embodiment
  • Fig. 7b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the seventh embodiment
  • the embodiment of the present invention provides a lens module.
  • the lens module includes a lens barrel, an electronic photosensitive chip, and the optical system provided in the embodiment of the present invention.
  • the first lens to the sixth lens of the optical system are installed in the lens barrel, and the electronic
  • the photosensitive chip is arranged on the image side of the optical system, and is used for converting light passing through the first lens to the sixth lens and incident on the electronic photosensitive chip into electrical signals of the image.
  • the electronic photosensitive chip may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS).
  • CMOS complementary Metal Oxide Semiconductor
  • the lens module can be an independent lens of a digital camera, or it can be an imaging module integrated on an electronic device such as a smart phone.
  • the lens module provided by the embodiment of the present application has a higher imaging quality and can be adapted to electronic photosensitive chips with higher pixels.
  • the overall length of the lens module is small to achieve miniaturization.
  • An embodiment of the present invention provides an electronic device, which includes a housing and the lens module provided in the embodiment of the present invention.
  • the lens module and the electronic photosensitive chip are arranged in the housing.
  • the electronic device can be a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, an e-book reader, a driving recorder, a wearable device, etc.
  • PDA personal digital assistant
  • the electronic device provided by the embodiments of the present application has a higher imaging quality, and at the same time, the overall length of the electronic device is small, which realizes miniaturization.
  • An embodiment of the present invention provides an optical system that includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the object side to the image side along the optical axis direction.
  • a first lens In the first lens to the sixth lens, there may be an air gap between any two adjacent lenses.
  • the specific shape and structure of the six lenses are as follows: the first lens has positive refractive power, the object side of the first lens is convex, and the image side of the first lens has a concave surface near the optical axis; the second lens has refraction Power, the object side of the second lens is convex at the near optical axis, and the image side of the second lens is concave at the near optical axis; the third lens has refractive power, and both the object and image sides of the third lens are aspherical; The fourth lens has positive refractive power, and the object and image sides of the fourth lens are aspherical; the fifth lens has refractive power, and the object and image sides of the fifth lens are aspheric; the sixth lens has Negative refractive power, the image side surface of the sixth lens is concave near the optical axis, the near circumference of the image side surface of the sixth lens is convex, and at least one of the object side surface and the image side surface of the sixth lens is provided with at
  • the optical system satisfies the conditional formula: 45.5 ⁇ f*43/ImgH ⁇ 61.0; where f is the effective focal length of the optical system, and ImgH is the diagonal length of the effective imaging area of the optical system on the imaging surface.
  • This conditional formula is the equivalent focal length of the optical system calculated on the basis of the full frame. Generally, the equivalent focal length of the optical system is greater than 50mm, that is, it has a certain telephoto capability.
  • the lens composed of the optical system provided in the embodiment has a magnification capacity of 2 times.
  • the reasonable lens size and refractive power configuration can enable the long-distance object to obtain the close-up imaging effect.
  • the optical system satisfies the conditional formula: 0.89 ⁇ TTL/f ⁇ 1.0; where TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and f is the effective focal length of the optical system . In a specific embodiment, f is greater than 6 mm. Therefore, the optical system can have a certain telephoto capability with a certain size of electronic photosensitive chip. When the optical system satisfies the above conditional formula, the optical system can provide a higher effective focal length within the range of TTL ⁇ 6.5mm, reduce the physical length of the optical system TTL, and make the optical system easier to implant in portable devices.
  • the use of an aspheric lens makes the TTL smaller than the effective focal length f, which is beneficial to the optical system to balance chromatic aberration, spherical aberration, and distortion, so as to obtain good imaging quality.
  • the optical system satisfies the conditional formula: 5.5°/mm ⁇ FOV/f ⁇ 8.2°/mm; where FOV is the diagonal viewing angle of the optical system, and f is the effective focal length of the optical system.
  • FOV the diagonal viewing angle of the optical system
  • f the effective focal length of the optical system.
  • the optical system satisfies the conditional formula: 1.9 ⁇ (
  • the third lens provides positive or negative refractive power
  • the fourth lens provides positive refractive power.
  • the combined structure of the third lens and the fourth lens can offset most of the distortion and coma produced by the front lens.
  • a reasonable radius of curvature setting can avoid the introduction of large spherical aberration and vertical chromatic aberration, thereby facilitating the reasonable distribution of primary aberrations on each lens, thereby reducing tolerance sensitivity.
  • the optical system satisfies the conditional formula: 3.3 ⁇ R51/CT56 ⁇ 28.7; where R51 is the radius of curvature of the object side of the fifth lens at the near optical axis, and CT56 is the image side of the fifth lens and the sixth lens.
  • R51 is the radius of curvature of the object side of the fifth lens at the near optical axis
  • CT56 is the image side of the fifth lens and the sixth lens.
  • the fifth lens provides positive or negative refractive power, adjusts the refractive power distribution of the entire lens group, helps disperse aberrations, and obtains high resolution.
  • the appropriate curvature of the edge changes, which reduces the deflection angle of the light in each field of view at the edge; reasonable lens curvature and thickness control can effectively reduce the difficulty of forming and assembling the optical system.
  • the optical system satisfies the conditional formula: 1.2 ⁇ (CT1+CT2+CT3)/BF ⁇ 2.1; where CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis. Thickness, CT3 is the thickness of the third lens on the optical axis, and BF is the closest distance from the image side surface of the sixth lens to the imaging surface along the optical axis. In a specific embodiment, the BF is greater than 0.75. Under this condition, the optical system and the electronic photosensitive chip can form a good matching relationship, which is also more conducive to the installation of various module components.
  • the compact structure of the first lens, the second lens and the third lens contributes to the reduction of TTL.
  • the reasonable thickness spacing control allows the first three lenses to produce The aberration is very small, which reduces the difficulty of balancing aberrations in the optical system.
  • the optical system satisfies the conditional formula: 1.0 ⁇ SAG61/CT6 ⁇ 2.9; where SAG61 is the intersection point of the object side surface of the sixth lens with the optical axis, which is the distance from the farthest point of the surface to the imaging surface along the optical axis.
  • CT6 is the thickness of the sixth lens on the optical axis.
  • the optical system satisfies the conditional formula:
  • CT34 is the distance between the image side of the third lens and the object side of the fourth lens on the optical axis
  • CT45 is the distance between the image side of the fourth lens and the object side of the fifth lens on the optical axis
  • CT56 is The distance between the image side surface of the fifth lens and the object side surface of the sixth lens on the optical axis.
  • the spherical aberration and chromatic aberration generated by the front lens group can be effectively balanced, thereby improving the overall image quality.
  • the optical system satisfies the conditional formula: 2.7mm ⁇ TTL/FNO ⁇ 3.1mm; where 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 aperture number of the optical system.
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has positive refractive power.
  • the near optical axis of the object side surface S3 of the second lens L2 is convex, the near circumference of the object side surface S3 is concave, and the second lens L2 is at the near optical axis and near circumference of the image side surface S4. The place is concave;
  • the third lens L3 has a negative refractive power, the near optical axis and the circumference of the third lens L3 object side surface S5 are convex, and the third lens L3 is concave at the near optical axis and the circumference of the image side surface S6;
  • the fourth lens L4 has a positive refractive power.
  • the fourth lens L4 has a convex surface at the near optical axis of the object side S7, a concave surface at the near circumference of the object side S7, and the fourth lens L4 at the near optical axis and near the circumference of the image side S8 Convex
  • the fifth lens L5 has a positive refractive power.
  • the fifth lens L5 has a concave surface at the near optical axis and near the circumference of the object side surface S9; the fifth lens L5 has a convex surface at the near optical axis of the image side surface S10, and the near circumference of the image side surface S10 The place is concave.
  • the sixth lens L6 has negative refractive power.
  • the sixth lens L6 has a convex surface at the near optical axis of the object side S11, and a concave surface at the near circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12.
  • the image side surface S12 has a convex surface near the circumference.
  • the materials of the first lens L1 to the sixth lens L6 are all plastic.
  • the optical system also includes a stop STO, an infrared filter L7, and an imaging surface S15.
  • the stop STO is arranged on the side of the first lens L1 away from the second lens L2 for controlling the amount of light entering. In other embodiments, the stop STO can also be arranged between two adjacent lenses, or on other lenses.
  • the infrared filter L7 is arranged on the image side of the sixth lens L6 and includes the object side S13 and the image side S14.
  • the infrared filter L7 is used to filter out infrared light so that the light entering the imaging surface S15 is visible light.
  • the wavelength is 380nm-780nm.
  • the material of the infrared filter L7 is glass, and it can be coated on the glass.
  • the imaging surface S15 is the effective pixel area of the electronic photosensitive chip.
  • Table 1a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
  • f is the effective focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the 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.
  • the object side surface and the image side surface of any one of the first lens L1 to the sixth lens L6 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:
  • x is the distance vector height of the aspheric surface at a height h along the optical axis direction;
  • k is the conic coefficient;
  • Ai is the correction coefficient of the i-th order of the aspheric surface.
  • Table 1b shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces S1-S10 that can be used in the first embodiment.
  • FIG. 1b shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the first embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focus point of light of different wavelengths after passing through the lenses of the optical system
  • the astigmatism curve represents the meridional curvature of the field and the sagittal curvature of the field
  • the distortion curve represents the magnitude of distortion corresponding to different field angles .
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has negative refractive power, the near optical axis and the circumference of the second lens L2 object side surface S3 are convex, and the image side surface S4 of the second lens L2 is concave at the near optical axis and circumference;
  • the third lens L3 has a negative refractive power, the near optical axis and the circumference of the third lens L3 object side surface S5 are convex, and the third lens L3 is concave at the near optical axis and the circumference of the image side surface S6;
  • the fourth lens L4 has a positive refractive power, the near optical axis and the periphery of the fourth lens L4 object side surface S7 are concave, and the fourth lens L4 is convex on the near optical axis and the periphery of the image side surface S8;
  • the fifth lens L5 has a positive refractive power.
  • the fifth lens L5 has a concave surface at the near optical axis and near the circumference of the object side surface S9; the fifth lens L5 has a convex surface at the near optical axis of the image side surface S10, and the near circumference of the image side surface S10 The place is concave.
  • the sixth lens L6 has negative refractive power.
  • the sixth lens L6 has a convex surface at the near optical axis and the near circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12, and the near circumference of the image side S12 The place is convex.
  • the other structure of the second embodiment is the same as that of the first embodiment, so refer to.
  • Table 2a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
  • each parameter in Table 2a is the same as the meaning of each parameter in the first embodiment.
  • Table 2b shows the coefficients of higher-order terms that can be used for each aspheric mirror surface in the second embodiment, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • Fig. 2b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment. According to Fig. 2b, it can be seen that the optical system provided in the second embodiment can achieve good imaging quality.
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has a positive refractive power, the near optical axis and the circumference of the object side surface S3 of the second lens L2 are convex, and the image side surface S4 of the second lens L2 is concave at the near optical axis and the circumference;
  • the third lens L3 has a negative refractive power.
  • the near optical axis and the circumference of the object side surface S5 of the third lens L3 are convex, and the image side surface S6 of the third lens L3 is concave at the near optical axis and circumference;
  • the fourth lens L4 has a positive refractive power.
  • the fourth lens L4 has a convex surface at the near optical axis of the object side S7, a concave surface at the near circumference of the object side S7, and the fourth lens L4 at the near optical axis and near the circumference of the image side S8 Convex
  • the fifth lens L5 has negative refractive power.
  • the fifth lens L5 has a concave surface at the near optical axis and near the circumference of the object side surface S9, and the fifth lens L5 has a convex surface at the near optical axis of the image side surface S10, and the near circumference of the image side surface S10. The place is concave.
  • the sixth lens L6 has negative refractive power.
  • the sixth lens L6 has a convex surface at the near optical axis of the object side S11, and a concave surface at the near circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12.
  • the image side surface S12 has a convex surface near the circumference.
  • the other structure of the third embodiment is the same as that of the first embodiment, so refer to.
  • Table 3a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of Y radius, thickness, and focal length are all millimeters (mm).
  • each parameter in Table 3a is the same as the meaning of each parameter in the first embodiment.
  • Table 3b shows the coefficients of higher-order terms applicable to each aspheric mirror surface in the third embodiment, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • Fig. 3b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment. According to FIG. 3b, it can be seen that the optical system provided in the third embodiment can achieve good imaging quality.
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has a negative refractive power.
  • the near optical axis of the object side surface S3 of the second lens L2 is a convex surface
  • the near circumference of the object side surface S3 is a concave surface
  • the second lens L2 has a concave surface near the optical axis of the image side surface S4.
  • the image side surface S4 is convex near the circumference;
  • the third lens L3 has a negative refractive power, the near optical axis and the near circumference of the third lens L3 object side surface S5 are concave, and the third lens L3 is convex at the near optical axis and near the circumference of the image side surface S6;
  • the fourth lens L4 has positive refractive power.
  • the fourth lens L4 has a convex surface at the near optical axis and near the circumference of the object side surface S7, and the fourth lens L4 has a concave surface at the near optical axis of the image side surface S8, and the near circumference of the image side surface S8.
  • Convex is convex
  • the fifth lens L5 has a positive refractive power.
  • the fifth lens L5 has a convex surface at the near optical axis of the object side S9, and a concave surface at the near circumference of the object side S9; the fifth lens L5 is at the near optical axis and near the circumference of the image side S10 The place is concave.
  • the sixth lens L6 has a negative refractive power.
  • the sixth lens L6 has a concave surface at the near optical axis and the near circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12, and the near circumference of the image side S12 The place is convex.
  • the other structure of the fourth embodiment is the same as that of the first embodiment, so refer to.
  • Table 4a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
  • Table 4b shows the coefficients of higher-order terms that can be used for each aspheric mirror surface in the fourth embodiment, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • Fig. 4b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment. According to FIG. 4b, it can be seen that the optical system provided in the fourth embodiment can achieve good imaging quality.
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has negative refractive power, the near optical axis and the circumference of the second lens L2 object side surface S3 are convex, and the image side surface S4 of the second lens L2 is concave at the near optical axis and circumference;
  • the third lens L3 has a positive refractive power, the third lens L3 has a convex surface at the near optical axis and near the circumference of the object side surface S5, and the third lens L3 has a convex surface at the near optical axis and near the circumference of the image side surface S6;
  • the fourth lens L4 has a positive refractive power, the near optical axis and the circumference of the fourth lens L4 object side surface S7 are convex surfaces, and the image side surface S8 of the fourth lens L4 is concave near the optical axis and circumference positions;
  • the fifth lens L5 has positive refractive power.
  • the fifth lens L5 has a convex surface at the near optical axis of the object side S9, and a concave surface at the near circumference of the object side S9; the fifth lens L5 has a convex surface at the near optical axis of the image side S10.
  • the image side surface S10 has a concave surface near the circumference.
  • the sixth lens L6 has a negative refractive power.
  • the sixth lens L6 has a concave surface at the near optical axis and the near circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12, and the near circumference of the image side S12 The place is convex.
  • the other structure of the fifth embodiment is the same as that of the first embodiment, so refer to.
  • Table 5a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of Y radius, thickness, and focal length are all millimeters (mm).
  • Table 5b shows the coefficients of higher-order terms applicable to each aspheric mirror surface in the fifth embodiment, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • Fig. 5b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment. According to FIG. 5b, it can be seen that the optical system provided in the fifth embodiment can achieve good imaging quality.
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has negative refractive power, the near optical axis and the circumference of the second lens L2 object side surface S3 are convex, and the image side surface S4 of the second lens L2 is concave at the near optical axis and circumference;
  • the third lens L3 has a positive refractive power, the near optical axis and the near circumference of the third lens L3 object side surface S5 are convex, and the third lens L3 is concave at the near optical axis and near the circumference of the image side surface S6;
  • the fourth lens L4 has a positive refractive power.
  • the fourth lens L4 has a convex surface at the near optical axis of the object side S7, a concave surface near the circumference of the object side S7, and a concave surface at the near optical axis of the image side S8 of the fourth lens L4.
  • the image side surface S8 is convex near the circumference;
  • the fifth lens L5 has a positive refractive power.
  • the fifth lens L5 has a concave surface at the near optical axis and near the circumference of the object side surface S9; the fifth lens L5 has a convex surface at the near optical axis and near the circumference of the image side surface S10.
  • the sixth lens L6 has a negative refractive power.
  • the sixth lens L6 has a convex surface at the near optical axis of the object side S11, and a concave surface near the circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12.
  • the image side surface S12 has a convex surface near the circumference.
  • the other structure of the sixth embodiment is the same as that of the first embodiment, so refer to.
  • Table 6a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
  • Table 6b shows the coefficients of higher-order terms that can be used for each aspheric mirror surface in the sixth embodiment, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • Fig. 6b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment. According to FIG. 6b, it can be seen that the optical system provided in the sixth embodiment can achieve good imaging quality.
  • the optical system of this embodiment from the object side to the image side along the optical axis direction, includes:
  • the first lens L1 has a positive refractive power.
  • the object side surface S1 of the first lens L1 has a convex surface at the near optical axis and the near circumference, the first lens L1 has a concave surface at the near optical axis of the image side surface S2, and the near circumference of the image side surface S2 Convex
  • the second lens L2 has negative refractive power, the near optical axis and the circumference of the second lens L2 object side surface S3 are convex, and the image side surface S4 of the second lens L2 is concave at the near optical axis and circumference;
  • the third lens L3 has a negative refractive power, the near optical axis and the near circumference of the third lens L3 object side surface S5 are concave, and the third lens L3 is convex at the near optical axis and near the circumference of the image side surface S6;
  • the fourth lens L4 has a positive refractive power, the near optical axis and the circumference of the fourth lens L4 object side surface S7 are convex surfaces, and the image side surface S8 of the fourth lens L4 is concave near the optical axis and circumference positions;
  • the fifth lens L5 has a negative refractive power.
  • the fifth lens L5 has a concave surface at the near optical axis and near the circumference of the object side surface S9; the fifth lens L5 has a convex surface at the near optical axis of the image side surface S10, and the near circumference of the image side surface S10 The place is concave;
  • the sixth lens L6 has negative refractive power.
  • the sixth lens L6 has a convex surface at the near optical axis of the object side S11, and a concave surface at the near circumference of the object side S11; the sixth lens L6 has a concave surface at the near optical axis of the image side S12.
  • the image side surface S12 has a convex surface near the circumference.
  • the other structure of the seventh embodiment is the same as that of the first embodiment, so refer to.
  • Table 7a shows a table of the characteristics of the optical system of this embodiment, where the data is obtained using light with a wavelength of 587 nm, and the units of Y radius, thickness, and focal length are all millimeters (mm).
  • Table 7b shows the coefficients of higher-order terms applicable to each aspheric mirror surface in the seventh embodiment, where each aspheric surface type can be defined by the formula given in the first embodiment.
  • Fig. 7b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the seventh embodiment. According to FIG. 7b, it can be seen that the optical system provided in the seventh embodiment can achieve good imaging quality.
  • Table 8 shows the f*43/ImgH, TTL/f, FOV/f, (
  • each embodiment can satisfy: 45.5 ⁇ f*43/ImgH ⁇ 61.0, 0.89 ⁇ TTL/f ⁇ 1.0, 5.5 ⁇ FOV/f ⁇ 8.2, 1.9 ⁇ (

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Abstract

一种光学系统、镜头模组和电子设备，光学系统沿光轴方向的物侧至像侧依次包含：第一透镜（L1），具有正屈折力，其物侧面（S1）为凸面，其像侧面（S2）在近光轴处为凹面；第二透镜（L2），具有屈折力，其物侧面（S3）在近光轴处为凸面，其像侧面（S4）在近光轴处为凹面；第三透镜（L3），具有屈折力；第四透镜（L4），具有正屈折力；第五透镜（L5），具有屈折力；第六透镜（L6），具有负屈折力，其像侧面（S12）在近光轴处为凹面，在近圆周处为凸面，且第六透镜的物侧面（S11）与像侧面（S12）中至少一个面设置有至少一个反曲点；第三、第四和第五透镜的物侧面（S5，S7，S9）与像侧面（S6，S8，S10）均为非球面。通过合理配置第一至第六各透镜（L1，L2，L3，L4，L5，L6）的面型和屈折力，使得光学系统具有较高的成像像质，同时适配更高像素的电子感光芯片，并实现小型化。

Description

光学系统、镜头模组及电子设备 技术领域
本发明涉及光学成像技术领域，尤其涉及一种光学系统、镜头模组和电子设备。
背景技术
随着市场对摄像高成像品质的要求，长焦镜头应运而生。目前，常规长焦镜头的光学系统物理焦距较长，所支持的感光芯片像素较低，难以满足市场需求。
因此，需要进一步提升长焦镜头的光学系统的成像像质，同时适配更高像素的电子感光芯片，并且，在此基础上，应尽可能的减小光学系统的物理长度，实现长焦镜头的小型化。
发明内容
本发明的目的在于提供一种光学系统、镜头模组和电子设备，能具有较高的成像像质，同时可适配更高像素的电子感光芯片，并且能够满足小型化的要求。
为实现本发明的目的，本发明提供了如下的技术方案：
第一方面，本发明提供了一种光学系统，沿光轴方向的物侧至像侧依次包含：第一透镜，具有正屈折力，所述第一透镜的物侧面为凸面，所述第一透镜像侧面的近光轴处为凹面；第二透镜，具有屈折力，所述第二透镜物侧面的近光轴处为凸面，所述第二透镜像侧面的近光轴处为凹面；第三透镜，具有屈折力，所述第三透镜的物侧面与像侧面均为非球面；第四透镜，具有正屈折力， 所述第四透镜的物侧面与像侧面均为非球面；第五透镜，具有屈折力，所述第五透镜的物侧面与像侧面均为非球面；第六透镜，具有负屈折力，所述第六透镜像侧面的近光轴处为凹面，所述第六透镜像侧面的近圆周处为凸面，且所述第六透镜的物侧面与像侧面中至少一个面设置有至少一个反曲点。通过合理配置所述第一透镜至所述第六透镜的各透镜的面型和屈折力，使得本申请所述的光学系统能够具有较高的成像像质，同时适配更高像素的电子感光芯片，并且能够满足小型化的要求。
一种实施方式中，所述光学系统满足条件式：45.5≤f*43/ImgH＜61.0；其中，f为所述光学系统的有效焦距，ImgH为所述光学系统于成像面上的有效成像区域面对角线长度。通过合理设置f*43/ImgH的值，可使本申请所述光学系统具有更好的长焦能力，能够适配更大尺寸和更高像素的电子感光芯片，更好的让远距离物体获得近距离成像效果。
一种实施方式中，所述光学系统满足条件式：0.89≤TTL/f＜1.0；其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离,f为所述光学系统的有效焦距。通过合理设置TTL/f的值，可使本申请所述光学系统在一定范围内提供更高的有效焦距，降低所述光学系统物理长度TTL，使其更加容易植入便携式设备中。
一种实施方式中，所述光学系统满足条件式：5.5°/mm＜FOV/f＜8.2°/mm；其中，FOV为所述光学系统的对角线视场角，f为所述光学系统的有效焦距。通过合理设置FOV/f的值，可使本申请所述光学系统在一定的有效焦距下，获得更大的视场角FOV，从而增大长焦对远距离物的成像范围。
一种实施方式中，所述光学系统满足条件式：1.9＜(|R32|+|R42|)/f≤13.44；其中，R32为所述第三透镜的像侧面于光轴处的曲率半径，R42为所述第四透镜的像侧面于光轴处的曲率半径，f为所述光学系统的有效焦距。通过合理设 置(|R32|+|R42|)/f的值，可抵消绝大部分前透镜产生的畸变和彗差，同时还能有效避免引入较大的球差和垂轴色差，从而有利于初级像差在各镜片上的合理分配，降低公差敏感性。
一种实施方式中，所述光学系统满足条件式：3.3≤R51/CT56＜28.7；其中，R51为所述第五透镜的物侧面于光轴处的曲率半径，CT56为所述第五透镜的像侧面与所述第六透镜的物侧面于光轴上的间隔距离。通过合理设置R51/CT56的值，可有效降低所述光学系统的成型与组装难度。
一种实施方式中，所述光学系统满足条件式：1.2＜(CT1+CT2+CT3)/BF＜2.1；其中，CT1为所述第一透镜于光轴上的厚度，CT2为所述第二透镜于光轴上的厚度，CT3为所述第三透镜于光轴上的厚度，BF为所述第六透镜像侧面沿光轴方向到成像面最近的距离。通过合理设置(CT1+CT2+CT3)/BF的值，使得所述第一透镜、所述第二透镜和所述第三透镜所产生的像差较小，从而降低所述光学系统平衡像差的难度。
一种实施方式中，所述光学系统满足条件式：1.0＜SAG61/CT6＜2.9；其中，SAG61为所述第六透镜物侧面与光轴的交点，与该面沿光轴方向到成像面的最远点之间的轴向距离，CT6为所述第六透镜于光轴上的厚度。通过合理设置SAG61/CT6的值，为光线在透镜边缘的偏折提供了良好的偏转角，避免了因偏折过大引起不易校正的像差，同时还可降低镜片成型难度，进而提升生产良率。
一种实施方式中，所述光学系统满足条件式：
19＜(|f3|+f4+|f5|)/(CT34+CT45+CT56)＜103；其中，f3为所述第三透镜的有效焦距，f4为所述第四透镜的有效焦距，f5为所述第五透镜的有效焦距，CT34为所述第三透镜的像侧面与所述第四透镜的物侧面于光轴上的间隔距离，CT45为所述第四透镜的像侧面与所述第五透镜的物侧面于光轴上的间隔距离， CT56为所述第五透镜的像侧面与所述第六透镜的物侧面于光轴上的间隔距离。通过合理设置(|f3|+f4+|f5|)/(CT34+CT45+CT56)的值，可有效平衡前透镜组产生的球差、色差等，从而提升整体像质。
一种实施方式中，所述光学系统满足条件式：2.7mm＜TTL/FNO＜3.1mm；其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，FNO为所述光学系统的光圈数。通过合理设置TTL/FNO的值，可使所述光学系统具有大光圈效果，并可在一定程度上提升所述光学系统在长焦拍摄下拍摄物的细节效果。
第二方面，本发明还提供了一种镜头模组，所述镜头模组包括镜筒和第一方面任一实施方式中的所述光学系统，所述光学系统的所述第一透镜至所述第六透镜安装在所述镜筒内，所述电子感光芯片设置在所述光学系统的像侧，用于将穿过所述第一透镜至所述第六透镜入射到所述电子感光芯片上的物的光线转换成图像的电信号。通过在所述镜头模组内安装该光学系统的第一透镜至第六透镜，使得本申请所述镜头模组具有较高的成像像质，且可适配更高像素的电子感光芯片，同时所述镜头模组总体长度较小，实现小型化。
第三方面，本发明还提供了一种电子设备，所述电子设备包括壳体和第二方面的所述镜头模组，所述镜头模组设于所述壳体内。通过在所述电子设备中设置第二方面的所述镜头模组，使得所述电子设备具有较高的成像像质，同时所述电子设备的总体长度较小，实现小型化。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付 出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1a是第一实施例的光学系统的结构示意图；
图1b是第一实施例的纵向球差曲线、像散曲线和畸变曲线；
图2a是第二实施例的光学系统的结构示意图；
图2b是第二实施例的纵向球差曲线、像散曲线和畸变曲线；
图3a是第三实施例的光学系统的结构示意图；
图3b是第三实施例的纵向球差曲线、像散曲线和畸变曲线；
图4a是第四实施例的光学系统的结构示意图；
图4b是第四实施例的纵向球差曲线、像散曲线和畸变曲线；
图5a是第五实施例的光学系统的结构示意图；
图5b是第五实施例的纵向球差曲线、像散曲线和畸变曲线；
图6a是第六实施例的光学系统的结构示意图；
图6b是第六实施例的纵向球差曲线、像散曲线和畸变曲线。
图7a是第七实施例的光学系统的结构示意图；
图7b是第七实施例的纵向球差曲线、像散曲线和畸变曲线；
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供了一种镜头模组，该镜头模组包括镜筒、电子感光芯片和本发明实施例提供的光学系统，光学系统的第一透镜至第六透镜安装在镜筒内，电子感光芯片设置在光学系统的像侧，用于将穿过第一透镜至第六透镜入 射到电子感光芯片上的物的光线转换成图像的电信号。电子感光芯片可以为互补金属氧化物半导体(Complementary Metal Oxide Semiconductor，CMOS)。该镜头模组可以是数码相机的独立的镜头，也可以是集成在如智能手机等电子设备上的成像模块。通过在镜头模组内安装该光学系统的第一透镜至第六透镜，使得本申请实施例提供的镜头模组具有较高的成像像质，且可适配更高像素的电子感光芯片，同时镜头模组总体长度较小，实现小型化。
本发明实施例提供了一种电子设备，该电子设备包括壳体和本发明实施例提供的镜头模组。镜头模组和电子感光芯片设置在壳体内。该电子设备可以为智能手机、个人数字助理(PDA)、平板电脑、智能手表、无人机、电子书籍阅读器、行车记录仪、可穿戴装置等。通过在电子设备中设置第二方面的镜头模组，使得本申请实施例提供的电子设备具有较高的成像像质，同时电子设备的总体长度较小，实现小型化。
本发明实施例提供了一种光学系统，该光学系统沿光轴方向的物侧至像侧依次包含第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜。在第一透镜至第六透镜中，任意相邻两片透镜之间均可具有空气间隔。
具体的，六片透镜的具体形状和结构如下：第一透镜，具有正屈折力，第一透镜的物侧面为凸面，第一透镜像侧面的近光轴处为凹面；第二透镜，具有屈折力，第二透镜物侧面的近光轴处为凸面，第二透镜像侧面的近光轴处为凹面；第三透镜，具有屈折力，第三透镜的物侧面与像侧面均为非球面；第四透镜，具有正屈折力，第四透镜的物侧面与像侧面均为非球面；第五透镜，具有屈折力，第五透镜的物侧面与像侧面均为非球面；第六透镜，具有负屈折力，第六透镜像侧面的近光轴处为凹面，第六透镜像侧面的近圆周处为凸面，且第六透镜的物侧面与像侧面中至少一个面设置有至少一个反曲点。该光学系统还包括光阑，光阑可设置在第一透镜至第六透镜之间的任一位置，如设置在第一 透镜上。
一种实施方式中，光学系统满足条件式：45.5≤f*43/ImgH＜61.0；其中，f为光学系统的有效焦距，ImgH为光学系统于成像面上的有效成像区域对角线长度。此条件式为光学系统以全画幅为基准计算的等效焦距，一般情况下，光学系统的等效焦距大于50mm，即具备一定的长焦能力，当光学系统满足上述条件式时，说明由本申请实施例提供的光学系统组成的镜头，相较于25mm成像镜头具有超2倍的放大能力，需要说明的是，ImgH较大，则光学系统可适配更大尺寸和更高像素的电子感光芯片，同时，合理的镜片尺寸与屈折力配置，能让远距离物体获得近距离成像效果。
一种实施方式中，光学系统满足条件式：0.89≤TTL/f＜1.0；其中，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离，f为光学系统的有效焦距。在一种具体的实施方式中，f大于6mm，因此，光学系统配合一定尺寸的电子感光芯片即可具备一定的长焦能力。当光学系统满足上述条件式时，在TTL＜6.5mm范围内，光学系统即可提供更高的有效焦距，降低光学系统物理长度TTL，使该光学系统更容易植入便携式设备中。需要说明的是，在光学系统中，非球面透镜的使用，使得TTL小于有效焦距f，有利于光学系统平衡色差、球差与畸变等像差，从而获得良好的成像品质。
一种实施方式中，光学系统满足条件式：5.5°/mm＜FOV/f＜8.2°/mm；其中，FOV为光学系统的对角线视场角，f为所述光学系统的有效焦距。其中，f的增大，成像视场角FOV会随之减小，当光学系统满足上述条件式时，可在一定有效焦距下，获得更大的视场角FOV，从而增大长焦对远距离物的成像范围。在一种具体的实施方式中，光学系统的F数小于2.21，使得光学系统拥有较高的进光量，从而给长焦拍摄提供更佳的相对亮度与色彩控制。
一种实施方式中，光学系统满足条件式：1.9＜(|R32|+|R42|)/f≤13.44；其 中，R32为第三透镜的像侧面于光轴处的曲率半径，R42为第四透镜的像侧面于光轴处的曲率半径，f为光学系统的有效焦距。在光学系统中，第三透镜提供正或负屈折力，第四透镜提供正屈折力，则第三透镜和第四透镜的组合结构可抵消绝大部分前透镜产生的畸变和彗差。同时，当光学系统满足上述条件式时，合理的曲率半径设置可避免引入较大的球差和垂轴色差，从而有利于初级像差在各镜片上的合理分配，进而降低公差敏感性。
一种实施方式中，光学系统满足条件式：3.3≤R51/CT56＜28.7；其中，R51为第五透镜的物侧面于近光轴处的曲率半径，CT56为第五透镜的像侧面与第六透镜的物侧面于光轴上的间隔距离。在光学系统中，第五透镜提供正或负的屈折力，调配了透镜组整体的屈折力分配，有助于分散像差，获得高解像力。同时，当光学系统满足上述条件式时，边缘适当的曲率变化，降低了各视场光线在边缘的偏转角；合理的镜片曲率与厚度控制，可有效降低光学系统的成型与组装难度。
一种实施方式中，光学系统满足条件式：1.2＜(CT1+CT2+CT3)/BF＜2.1；其中，CT1为第一透镜于光轴上的厚度，CT2为第二透镜于光轴上的厚度，CT3为第三透镜于光轴上的厚度，BF为第六透镜像侧面沿光轴方向到成像面最近的距离。在一种具体的实施方式中，BF大于0.75，在此条件下，光学系统与电子感光芯片可形成良好的匹配关系，也更利于各种模组部件的加装。可以理解的是，当光学系统满足上述条件式时，第一透镜、第二透镜和第三透镜的紧凑结构，有助于TTL的减小，同时合理的厚度间距的控制，让前三透镜产生的像差很小，从而降低了光学系统平衡像差的难度。
一种实施方式中，光学系统满足条件式：1.0＜SAG61/CT6＜2.9；其中，SAG61为第六透镜物侧面与光轴的交点，与该面沿光轴方向到成像面的最远点之间的轴向距离，CT6为第六透镜于光轴上的厚度。通过合理设置 SAG61/CT6的值，为光线在透镜边缘的偏折提供了良好的偏转角，避免了因偏折过大引起不易校正的像差，同时还可降低镜片成型难度，进而提升生产良率。
一种实施方式中，光学系统满足条件式：
19＜(|f3|+f4+|f5|)/(CT34+CT45+CT56)＜103；其中，f3为第三透镜的有效焦距，f4为第四透镜的有效焦距，f5为第五透镜的有效焦距，CT34为第三透镜的像侧面与第四透镜的物侧面于光轴上的间隔距离，CT45为第四透镜的像侧面与第五透镜的物侧面于光轴上的间隔距离，CT56为第五透镜的像侧面与第六透镜的物侧面于光轴上的间隔距离。通过合理设置(|f3|+f4+|f5|)/(CT34+CT45+CT56)的值，可有效平衡前透镜组产生的球差、色差等，从而提升整体像质。
一种实施方式中，光学系统满足条件式：2.7mm＜TTL/FNO＜3.1mm；其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，FNO为光学系统的光圈数。通过合理设置TTL/FNO的值，可使光学系统具有大光圈效果，并可在一定程度上提升光学系统在长焦拍摄下拍摄物的细节效果。
第一实施例
请参考图1a和图1b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周处为凸面；
第二透镜L2，具有正曲折力，第二透镜L2物侧面S3的近光轴处为凸面，物侧面S3的近圆周处为凹面，第二透镜L2像侧面S4的近光轴处和近圆周处为凹面；
第三透镜L3，具有负曲折力，第三透镜L3物侧面S5的近光轴处和近圆周处为凸面，第三透镜L3像侧面S6的近光轴处和近圆周处为凹面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处为凸面，物侧面S7的近圆周处为凹面，第四透镜L4像侧面S8的近光轴处和近圆周处为凸面；
第五透镜L5，具有正曲折力，第五透镜L5物侧面S9的近光轴处和近圆周处为凹面；第五透镜L5像侧面S10的近光轴处为凸面，像侧面S10的近圆周处为凹面。
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处为凸面，物侧面S11的近圆周处为凹面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆周处为凸面。
上述第一透镜L1至第六透镜L6的材质均为塑料(Plastic)。
此外，光学系统还包括光阑STO、红外滤光片L7和成像面S15。光阑STO设置在第一透镜L1远离第二透镜L2的一侧，用于控制进光量。其他实施例中，光阑STO还可以设置在相邻两透镜之间，或者是其他透镜上。红外滤光片L7设置在第六透镜L6的像方侧，其包括物侧面S13和像侧面S14，红外滤光片L7用于过滤掉红外光线，使得射入成像面S15的光线为可见光，可见光的波长为380nm-780nm。红外滤光片L7的材质为玻璃(Glass)，并可在玻璃上镀膜。成像面S15为电子感光芯片的有效像素区域。
表1a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表1a
Figure PCTCN2020081716-appb-000001
Figure PCTCN2020081716-appb-000002
其中，f为光学系统的有效焦距，FNO为光学系统的光圈数，FOV为光学系统的视场角，TTL为第一透镜的物侧面至光学系统的成像面于光轴上的距离。
在本实施例中，第一透镜L1至第六透镜L6的任意一个透镜的物侧面和像侧面均为非球面，各非球面透镜的面型x可利用但不限于以下非球面公式进行限定：
Figure PCTCN2020081716-appb-000003
其中，x为非球面沿光轴方向在高度为h的位置时，距非球面顶点的距离矢高；c为非球面的近轴曲率，c＝1/R(即，近轴曲率c为上表1a中Y半径R的倒数)；k为圆锥系数；Ai是非球面第i-th阶的修正系数。表1b给出了可用 于第一实施例中各非球面镜面S1-S10的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。
表1b
Figure PCTCN2020081716-appb-000004
图1b示出了第一实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。其中，纵向球差曲线表示不同波长的光线经由光学系统的各透镜后的会聚焦点偏离；像散曲线表示子午像面弯曲和弧矢像面弯曲；畸变曲线表示不同视 场角对应的畸变大小值。根据图1b可知，第一实施例所给出的光学系统能够实现良好的成像品质。
第二实施例
请参考图2a和图2b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周处为凸面；
第二透镜L2，具有负曲折力，第二透镜L2物侧面S3的近光轴处和近圆周处为凸面，第二透镜L2像侧面S4的近光轴处和近圆周处为凹面；
第三透镜L3，具有负曲折力，第三透镜L3物侧面S5的近光轴处和近圆周处为凸面，第三透镜L3像侧面S6的近光轴处和近圆周处为凹面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处和近圆周处为凹面，第四透镜L4像侧面S8的近光轴处和近圆周处为凸面；
第五透镜L5，具有正曲折力，第五透镜L5物侧面S9的近光轴处和近圆周处为凹面；第五透镜L5像侧面S10的近光轴处为凸面，像侧面S10的近圆周处为凹面。
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处和近圆周处为凸面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆周处为凸面。
第二实施例的其他结构与第一实施例相同，参照即可。
表2a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表2a
Figure PCTCN2020081716-appb-000005
其中，表2a的各参数含义均与第一实施例各参数含义相同。
表2b给出了可用于第二实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。
表2b
Figure PCTCN2020081716-appb-000006
Figure PCTCN2020081716-appb-000007
图2b示出了第二实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。根据图2b可知，第二实施例所给出的光学系统能够实现良好的成像品质。
第三实施例
请参考图3a和图3b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周处为凸面；
第二透镜L2，具有正曲折力，第二透镜L2物侧面S3的近光轴处和近圆周处为凸面，第二透镜L2像侧面S4的近光轴处和近圆周处为凹面；
第三透镜L3，具有负曲折力，第三透镜L3物侧面S5的近光轴处和近圆 周处为凸面，第三透镜L3像侧面S6的近光轴处和近圆周处为凹面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处为凸面，物侧面S7的近圆周处为凹面，第四透镜L4像侧面S8的近光轴处和近圆周处为凸面；
第五透镜L5，具有负曲折力，第五透镜L5物侧面S9的近光轴处和近圆周处为凹面，第五透镜L5像侧面S10的近光轴处为凸面，像侧面S10的近圆周处为凹面。
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处为凸面，物侧面S11的近圆周处为凹面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆周处为凸面。
第三实施例的其他结构与第一实施例相同，参照即可。
表3a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表3a
Figure PCTCN2020081716-appb-000008
Figure PCTCN2020081716-appb-000009
其中，表3a的各参数含义均与第一实施例各参数含义相同。
表3b给出了可用于第三实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。
表3b
Figure PCTCN2020081716-appb-000010
Figure PCTCN2020081716-appb-000011
图3b示出了第三实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。根据图3b可知，第三实施例所给出的光学系统能够实现良好的成像品质。
第四实施例
请参考图4a和图4b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周处为凸面；
第二透镜L2，具有负曲折力，第二透镜L2物侧面S3的近光轴处为凸面，物侧面S3的近圆周处为凹面，第二透镜L2像侧面S4的近光轴处为凹面，像侧面S4的近圆周处为凸面；
第三透镜L3，具有负曲折力，第三透镜L3物侧面S5的近光轴处和近圆周处为凹面，第三透镜L3像侧面S6的近光轴处和近圆周处为凸面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处和近圆周处为凸面，第四透镜L4像侧面S8的近光轴处为凹面，像侧面S8的近圆周处为凸面；
第五透镜L5，具有正曲折力，第五透镜L5物侧面S9的近光轴处为凸面，物侧面S9的近圆周处为凹面；第五透镜L5像侧面S10的近光轴处和近圆周处为凹面。
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处和近圆周处为凹面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆 周处为凸面。
第四实施例的其他结构与第一实施例相同，参照即可。
表4a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表4a
Figure PCTCN2020081716-appb-000012
其中，表4a的各参数含义均与第一实施例各参数含义相同。
表4b给出了可用于第四实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。
表4b
Figure PCTCN2020081716-appb-000013
Figure PCTCN2020081716-appb-000014
图4b示出了第四实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。根据图4b可知，第四实施例所给出的光学系统能够实现良好的成像品质。
第五实施例
请参考图5a和图5b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周 处为凸面；
第二透镜L2，具有负曲折力，第二透镜L2物侧面S3的近光轴处和近圆周处为凸面，第二透镜L2像侧面S4的近光轴处和近圆周处为凹面；
第三透镜L3，具有正曲折力，第三透镜L3物侧面S5的近光轴处和近圆周处为凸面，第三透镜L3像侧面S6的近光轴处和近圆周处为凸面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处和近圆周处为凸面，第四透镜L4像侧面S8的近光轴处和近圆周处为凹面；
第五透镜L5，具有正曲折力，第五透镜L5物侧面S9的近光轴处为凸面，物侧面S9的近圆周处为凹面；第五透镜L5像侧面S10的近光轴处为凸面，像侧面S10的近圆周处为凹面。
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处和近圆周处为凹面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆周处为凸面。
第五实施例的其他结构与第一实施例相同，参照即可。
表5a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表5a
Figure PCTCN2020081716-appb-000015
Figure PCTCN2020081716-appb-000016
其中，表5a的各参数含义均与第一实施例各参数含义相同。
表5b给出了可用于第五实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。
表5b
Figure PCTCN2020081716-appb-000017
Figure PCTCN2020081716-appb-000018
图5b示出了第五实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。根据图5b可知，第五实施例所给出的光学系统能够实现良好的成像品质。
第六实施例
请参考图6a和图6b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周处为凸面；
第二透镜L2，具有负曲折力，第二透镜L2物侧面S3的近光轴处和近圆周处为凸面，第二透镜L2像侧面S4的近光轴处和近圆周处为凹面；
第三透镜L3，具有正曲折力，第三透镜L3物侧面S5的近光轴处和近圆周处为凸面，第三透镜L3像侧面S6的近光轴处和近圆周处为凹面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处为凸面，物侧面S7的近圆周处为凹面，第四透镜L4像侧面S8的近光轴处为凹面，像侧面S8的近圆周处为凸面；
第五透镜L5，具有正曲折力，第五透镜L5物侧面S9的近光轴处和近圆周处为凹面；第五透镜L5像侧面S10的近光轴处和近圆周处为凸面。
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处为凸面， 物侧面S11的近圆周处为凹面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆周处为凸面。
第六实施例的其他结构与第一实施例相同，参照即可。
表6a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表6a
Figure PCTCN2020081716-appb-000019
其中，表6a的各参数含义均与第一实施例各参数含义相同。
表6b给出了可用于第六实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。
表6b
Figure PCTCN2020081716-appb-000020
图6b示出了第六实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。根据图6b可知，第六实施例所给出的光学系统能够实现良好的成像品质。
第七实施例
请参考图7a和图7b，本实施例的光学系统，沿光轴方向的物侧至像侧依次包括：
第一透镜L1，具有正曲折力，第一透镜L1物侧面S1的近光轴处和近圆周处为凸面，第一透镜L1像侧面S2的近光轴处为凹面，像侧面S2的近圆周处为凸面；
第二透镜L2，具有负曲折力，第二透镜L2物侧面S3的近光轴处和近圆周处为凸面，第二透镜L2像侧面S4的近光轴处和近圆周处为凹面；
第三透镜L3，具有负曲折力，第三透镜L3物侧面S5的近光轴处和近圆周处为凹面，第三透镜L3像侧面S6的近光轴处和近圆周处为凸面；
第四透镜L4，具有正曲折力，第四透镜L4物侧面S7的近光轴处和近圆周处为凸面，第四透镜L4像侧面S8的近光轴处和近圆周处为凹面；
第五透镜L5，具有负曲折力，第五透镜L5物侧面S9的近光轴处和近圆周处为凹面；第五透镜L5像侧面S10的近光轴处为凸面，像侧面S10的近圆周处为凹面；
第六透镜L6，具有负曲折力，第六透镜L6物侧面S11的近光轴处为凸面，物侧面S11的近圆周处为凹面；第六透镜L6像侧面S12的近光轴处为凹面，像侧面S12的近圆周处为凸面。
第七实施例的其他结构与第一实施例相同，参照即可。
表7a示出了本实施例的光学系统的特性的表格，其中的数据采用波长为587nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。
表7a
Figure PCTCN2020081716-appb-000021
Figure PCTCN2020081716-appb-000022
其中，表7a的各参数含义均与第一实施例各参数含义相同。
表7b给出了可用于第七实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。
表7b
Figure PCTCN2020081716-appb-000023
Figure PCTCN2020081716-appb-000024
图7b示出了第七实施例的光学系统的纵向球差曲线、像散曲线和畸变曲线。根据图7b可知，第七实施例所给出的光学系统能够实现良好的成像品质。
表8为第一实施例至第七实施例的光学系统的f*43/ImgH、TTL/f、FOV/f、(|R32|+|R42|)/f、R51/CT56、(CT1+CT2+CT3)/BF、SAG61/CT6、(|f3|+f4+|f5|)/(CT34+CT45+CT56)的值。
表8
Figure PCTCN2020081716-appb-000025
Figure PCTCN2020081716-appb-000026
由表8可见，各实施例均能满足：45.5≤f*43/ImgH＜61.0、0.89≤TTL/f＜1.0、5.5＜FOV/f＜8.2、1.9＜(|R32|+|R42|)/f≤13.44、3.3≤R51/CT56＜28.7、1.2＜(CT1+CT2+CT3)/BF＜2.1、1.0＜SAG61/CT6＜2.9、19＜(|f3|+f4+|f5|)/(CT34+CT45+CT56)＜103。
以上实施例的各技术特征可以进行任意的组合，为使描述简介，未对上述实施例中的各个技术特征所以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，可应当认为是本说明书记载的范围。
以上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本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，本发明的保护范围应以所附权利要求为准。

Claims (12)

  1. 一种光学系统，其特征在于，沿光轴方向的物侧至像侧依次包含：
    第一透镜，具有正屈折力，所述第一透镜的物侧面为凸面，所述第一透镜的像侧面近光轴处为凹面；
    第二透镜，具有屈折力，所述第二透镜的物侧面近光轴处为凸面，所述第二透镜的像侧面近光轴处为凹面；
    第三透镜，具有屈折力，所述第三透镜的物侧面与像侧面均为非球面；
    第四透镜，具有正屈折力，所述第四透镜的物侧面与像侧面均为非球面；
    第五透镜，具有屈折力，所述第五透镜的物侧面与像侧面均为非球面；
    第六透镜，具有负屈折力，所述第六透镜的像侧面近光轴处为凹面，所述第六透镜的像侧面近圆周处为凸面，且所述第六透镜的物侧面与像侧面中至少一个面设置有至少一个反曲点。
  2. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    45.5≤f*43/ImgH＜61.0；
    其中，f为所述光学系统的有效焦距，ImgH为所述光学系统于成像面上的有效成像区域对角线长度。
  3. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    0.89≤TTL/f＜1.0；
    其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，f为所述光学系统的有效焦距。
  4. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条 件式：
    5.5°/mm＜FOV/f＜8.2°/mm；
    其中，FOV为所述光学系统的对角线视场角，f为所述光学系统的有效焦距。
  5. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    1.9＜(|R32|+|R42|)/f≤13.44；
    其中，R32为所述第三透镜的像侧面于光轴处的曲率半径，R42为所述第四透镜的像侧面于光轴处的曲率半径，f为所述光学系统的有效焦距。
  6. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    3.3≤R51/CT56＜28.7；
    其中，R51为所述第五透镜的物侧面于光轴处的曲率半径，CT56为所述第五透镜的像侧面与所述第六透镜的物侧面于光轴上的间隔距离。
  7. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    1.2＜(CT1+CT2+CT3)/BF＜2.1；
    其中，CT1为所述第一透镜于光轴上的厚度，CT2为所述第二透镜于光轴上的厚度，CT3为所述第三透镜于光轴上的厚度，BF为所述第六透镜像侧面沿光轴方向到成像面最近的距离。
  8. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    1.0＜SAG61/CT6＜2.9；
    其中，SAG61为所述第六透镜物侧面与光轴的交点，与该面沿光轴方向到 成像面的最远点之间的轴向距离，CT6为所述第六透镜于光轴上的厚度。
  9. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    19＜(|f3|+f4+|f5|)/(CT34+CT45+CT56)＜103；
    其中，f3为所述第三透镜的有效焦距，f4为所述第四透镜的有效焦距，f5为所述第五透镜的有效焦距，CT34为所述第三透镜的像侧面与所述第四透镜的物侧面于光轴上的间隔距离，CT45为所述第四透镜的像侧面与所述第五透镜的物侧面于光轴上的间隔距离，CT56为所述第五透镜的像侧面与所述第六透镜的物侧面于光轴上的间隔距离。
  10. 根据权利要求1所述的光学系统，其特征在于，所述光学系统满足条件式：
    2.7mm＜TTL/FNO＜3.1mm；
    其中，TTL为所述第一透镜的物侧面至所述光学系统的成像面于光轴上的距离，FNO为所述光学系统的光圈数。
  11. 一种镜头模组，其特征在于，包括镜筒、电子感光芯片和如权利要求1至10任一项所述的光学系统，所述光学系统的所述第一透镜至所述第六透镜安装在所述镜筒内，所述电子感光芯片设置在所述光学系统的像侧，用于将穿过所述第一透镜至所述第六透镜入射到所述电子感光芯片上的物的光线转换成图像的电信号。
  12. 一种电子设备，其特征在于，包括壳体和如权利要求10所述的镜头模组，所述镜头模组设于所述壳体内。
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