WO2022041054A1 - Système optique, module de caméra et dispositif électronique - Google Patents

Système optique, module de caméra et dispositif électronique Download PDF

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Publication number
WO2022041054A1
WO2022041054A1 PCT/CN2020/111764 CN2020111764W WO2022041054A1 WO 2022041054 A1 WO2022041054 A1 WO 2022041054A1 CN 2020111764 W CN2020111764 W CN 2020111764W WO 2022041054 A1 WO2022041054 A1 WO 2022041054A1
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Prior art keywords
lens
optical system
optical axis
object side
image side
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PCT/CN2020/111764
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English (en)
Chinese (zh)
Inventor
杨懿
党绪文
谭怡翔
刘秀
李明
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欧菲光集团股份有限公司
南昌欧菲精密光学制品有限公司
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Priority to PCT/CN2020/111764 priority Critical patent/WO2022041054A1/fr
Publication of WO2022041054A1 publication Critical patent/WO2022041054A1/fr

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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 application belongs to the field of optical imaging, and in particular relates to an optical system, a camera module and an electronic device.
  • the current photographic equipment has a trend of miniaturization, which makes it difficult for the telephoto camera on it to take into account the effective focal length and the total length of the system. Either the effective focal length is too short, and it is difficult to perform telephoto shooting, or the total length of the system is too long. Equipped with small camera equipment such as mobile phones.
  • the present application provides an optical system, the optical system includes in order from the object side to the image side: a first lens having a positive bending force, and the object side of the first lens is a convex surface at the near optical axis;
  • the second lens has bending power;
  • the third lens has bending power, and the image side of the third lens is concave at the near optical axis;
  • the fourth lens has negative bending power, and the object side of the fourth lens is near the optical axis.
  • the optical axis is convex, and the image side of the fourth lens is concave at the near optical axis; the fifth lens has a bending force, and the object side of the fifth lens is concave at the near optical axis; the sixth lens, It has a bending force, and the image side of the sixth lens is convex at the near optical axis; the seventh lens has a negative bending force, and the image side of the seventh lens is concave at the near optical axis, and the seventh lens has a concave surface.
  • Both the object side surface and the image side surface of the seventh lens are aspherical, and at least one of the object side surface and the image side surface of the seventh lens is provided with at least one inflection point.
  • the optical system can take into account the effective focal length and the total length of the system, so as to have a sufficiently long effective focal length and a short system.
  • the overall length can meet the requirements of miniaturization and telephoto photography at the same time.
  • the optical system satisfies the conditional formula: f/TTL>1; where f is the effective focal length of the optical system, and TTL is the object side of the first lens to the imaging plane of the optical system distance on the optical axis.
  • f/TTL the effective focal length of the optical system
  • TTL the object side of the first lens to the imaging plane of the optical system distance on the optical axis.
  • the optical system satisfies the conditional formula: 0mm -1 ⁇ FNO/(ImgH*2) ⁇ 5mm -1 ; wherein, FNO is the aperture number of the optical system, and Imgh is the imaging surface of the optical system Half of the diagonal length of the upper effective photosensitive area. It is understandable that Imgh determines the size of the electronic photosensitive chip, and the larger the Imgh, the larger the size of the largest electronic photosensitive chip that the optical system can support.
  • the optical system can support high-pixel electronic photosensitive chips; at the same time, it provides a larger aperture number, which can achieve higher The amount of light, the optical system can more easily highlight the subject and blur the background under telephoto shooting.
  • the optical system satisfies the conditional formula: Y11/Y72 ⁇ 0.6; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and Y72 is the effective semi-aperture of the image side of the seventh lens.
  • Y11/Y72 is lower than 0.6, the effective aperture of the object side of the first lens is small, and the optical system has the characteristics of small head size, which is conducive to realizing miniaturized design.
  • the optical system satisfies the conditional formula: 1 ⁇ BF/CT67 ⁇ 3; wherein, BF is the shortest distance from the image side surface of the seventh lens to the imaging surface, and CT67 is the image side surface of the sixth lens and the distance between the object side of the seventh lens and the optical axis.
  • BF/CT67 the conditional formula: 1 ⁇ BF/CT67 ⁇ 3; wherein, BF is the shortest distance from the image side surface of the seventh lens to the imaging surface, and CT67 is the image side surface of the sixth lens and the distance between the object side of the seventh lens and the optical axis.
  • the optical system satisfies the conditional formula: 6 ⁇ (Y72*TTL)/(ET7*f) ⁇ 13; wherein, Y72 is the effective half-aperture of the image side of the seventh lens, and TTL is the The distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the thickness of the edge of the optical effective area of the seventh lens, and f is the effective focal length of the optical system.
  • the optical system satisfies the conditional formula: 0 ⁇ f123/R32 ⁇ 10; wherein, f123 is the combined effective focal length of the first lens, the second lens and the third lens, and R32 is The curvature radius of the image side surface of the third lens at the optical axis.
  • f123/R32 between 0 and 10
  • the change of the curvature of the third lens quickly compresses the aperture of the light in the optical system, which is conducive to the further control of the light by the rear lens; at the same time, it provides a larger first
  • the combined effective focal length of the lens to the third lens provides certain help for the improvement of the effective focal length of the optical system.
  • the optical system satisfies the conditional formula: 2.5 ⁇ TTL/ ⁇ AT ⁇ 4; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, ⁇ AT is the sum of the air intervals on the optical axis of any two adjacent lenses from the first lens to the seventh lens.
  • TTL/ ⁇ AT>4 the distance between adjacent lenses and the optical axis is too small, which increases tolerance sensitivity, is not conducive to lens assembly, and increases processing difficulty.
  • TTL/ ⁇ AT ⁇ 2.5 the total length of the system is too short, which is not conducive to realizing the telephoto characteristic.
  • the optical system satisfies the conditional formula: TTL/EPD ⁇ 3; wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system, and EPD is the The entrance pupil diameter of the optical system.
  • TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system
  • EPD is the The entrance pupil diameter of the optical system.
  • the optical system satisfies the conditional formula: 0.5 ⁇
  • the combined effective focal length of the lens, f is the effective focal length of the optical system.
  • the optical system satisfies the conditional formula: Y11/f ⁇ 0.3; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and f is the effective focal length of the optical system.
  • the present application further provides a camera module, the camera module includes a lens barrel, a photosensitive element, and the optical system according to any embodiment of the first aspect, wherein the first lens to seventh lens of the optical system The lenses are all installed in the lens barrel, and the photosensitive element is arranged on the image side of the optical system.
  • the camera module can meet the design requirements of miniaturization and telephoto photography at the same time, which is beneficial for the camera module to be applied to various small-volume and high-demand telephoto cameras. camera equipment.
  • the present application further provides an electronic device, the electronic device includes a casing and the camera module described in the second aspect, wherein the camera module is arranged in the casing.
  • the electronic device can meet the design requirements of a thinner body and a smaller volume, and at the same time, it can also perform high-definition imaging of a long-term view.
  • 1a is a schematic structural diagram of an optical system of the first embodiment
  • Fig. 1b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the first embodiment
  • 2a is a schematic structural diagram of an optical system of a second embodiment
  • Fig. 2b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the second embodiment
  • 3a is a schematic structural diagram of an optical system of a third embodiment
  • Fig. 3b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the third embodiment
  • 4a is a schematic structural diagram of an optical system of a fourth embodiment
  • Fig. 4b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fourth embodiment
  • Fig. 5a is the structural schematic diagram of the optical system of the fifth embodiment
  • Fig. 5b is a longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fifth embodiment.
  • the embodiment of the present application provides an electronic device, the electronic device includes a casing and the camera module provided by the embodiment of the present application, and the camera module is arranged in the casing.
  • the electronic device may be a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, an electronic book reader, a driving recorder, a wearable device, a monitoring device, various driving assistance systems, and the like.
  • PDA personal digital assistant
  • the electronic device can meet the design requirements of thinner body and smaller volume, and at the same time, it can also perform high-definition imaging in the long-range.
  • An embodiment of the present application provides a camera module.
  • the camera module includes a lens barrel, an electronic photosensitive element, and the optical system provided by the embodiment of the present application.
  • the first lens to the seventh lens of the optical system are installed in the lens barrel, and the electronic photosensitive element
  • the element is arranged on the image side of the optical system, and is used for converting the light rays incident on the object on the electronic photosensitive element through the first lens to the seventh lens into electrical signals of the image.
  • the electronic photosensitive element may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD).
  • CMOS Complementary Metal Oxide Semiconductor
  • CCD Charge-coupled Device
  • the camera module can be an independent lens of a digital camera, or an imaging module integrated on an electronic device such as a smart phone.
  • the camera module can meet the design requirements of miniaturization and telephoto photography at the same time, which is beneficial for the camera module to be applied to various small-volume and high-demand telephoto cameras. camera equipment.
  • the application provides an optical system, and the optical system sequentially includes from the object side to the image side:
  • the first lens has a positive bending force, and the object side surface of the first lens is convex at the near optical axis;
  • the second lens has a bending force
  • the third lens has a bending force, and the image side surface of the third lens is concave at the near optical axis;
  • the fourth lens has a negative bending force, the object side of the fourth lens is convex at the near optical axis, and the image side of the fourth lens is concave at the near optical axis;
  • the fifth lens has a bending force, and the object side of the fifth lens is concave at the near optical axis;
  • the sixth lens has a bending force, and the image side surface of the sixth lens is convex at the near optical axis;
  • the seventh lens has a negative bending force, the image side of the seventh lens is concave at the near optical axis, the object side and the image side of the seventh lens are both aspherical, and the object side of the seventh lens At least one inflection point is provided with at least one of the image sides.
  • the optical system can take into account the effective focal length and the total length of the system, so that it has a long enough effective focal length and a short total system length, and can meet the requirements of miniaturization and telephoto photography at the same time.
  • the optical system satisfies the conditional formula: f/TTL>1; where f is the effective focal length of the optical system, and TTL is the object side of the first lens to the imaging plane of the optical system distance on the optical axis.
  • f/TTL the effective focal length of the optical system
  • TTL the object side of the first lens to the imaging plane of the optical system distance on the optical axis.
  • the value of f/TTL may be 1, 1.05, 1.1, 1.26, 2, 5, and so on.
  • the optical system satisfies the conditional formula: 0mm -1 ⁇ FNO/(ImgH*2) ⁇ 5mm -1 ; wherein, FNO is the aperture number of the optical system, and Imgh is the imaging surface of the optical system Half of the diagonal length of the upper effective photosensitive area. It can be understood that Imgh determines the size of the electronic photosensitive chip, and the larger the Imgh, the larger the size of the largest electronic photosensitive chip that the optical system can support.
  • the optical system can support high-pixel electronic photosensitive chips; at the same time, it provides a larger aperture number, which can achieve higher The amount of light, the optical system can more easily highlight the subject and blur the background under telephoto shooting.
  • the value of FNO/(ImgH*2) may be 0 mm -1 , 0.7 mm -1 , 1.35 mm -1 , 2.4 mm -1 , 3.2 mm -1 , 4.8 mm -1 , 5 mm -1 , and the like.
  • the optical system satisfies the conditional formula: Y11/Y72 ⁇ 0.6; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and Y72 is the effective semi-aperture of the image side of the seventh lens.
  • Y11/Y72 is lower than 0.6, the effective aperture of the object side of the first lens is small, and the optical system has the characteristics of small head size, which is conducive to realizing miniaturized design.
  • the value of Y11/Y72 may be 0.6, 0.58, 0.54, 0.4, 0.3 and the like.
  • the optical system satisfies the conditional formula: 1 ⁇ BF/CT67 ⁇ 3; wherein, BF is the shortest distance from the image side surface of the seventh lens to the imaging surface, and CT67 is the image side surface of the sixth lens and the distance between the object side of the seventh lens and the optical axis.
  • BF/CT67 the value of BF/CT67 between 1 and 3
  • the sixth lens and the seventh lens have a reasonable distance, which helps to reduce aberration and improve resolution.
  • the value of BF/CT67 may be 1, 1.2, 1.5, 1.9, 2.4, 2.8, 3, etc.
  • the optical system satisfies the conditional formula: 6 ⁇ (Y72*TTL)/(ET7*f) ⁇ 13; wherein, Y72 is the effective half-aperture of the image side of the seventh lens, and TTL is the The distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the thickness of the edge of the optical effective area of the seventh lens, and f is the effective focal length of the optical system.
  • the value of (Y72*TTL)/(ET7*f) may be 6, 7.5, 8.5, 9.2, 11, 12.2, 13 and so on.
  • the optical system satisfies the conditional formula: 0 ⁇ f123/R32 ⁇ 10; wherein, f123 is the combined effective focal length of the first lens, the second lens and the third lens, and R32 is The curvature radius of the image side surface of the third lens at the optical axis.
  • f123/R32 between 0 and 10
  • the change of the curvature of the third lens quickly compresses the aperture of the light in the optical system, which is conducive to the further control of the light by the rear lens; at the same time, it provides a larger first
  • the combined effective focal length of the lens to the third lens provides certain help for the improvement of the effective focal length of the optical system.
  • the value of f123/R32 may be 0, 1, 3, 5, 8, 10 and so on.
  • the optical system satisfies the conditional formula: 2.5 ⁇ TTL/ ⁇ AT ⁇ 4; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, ⁇ AT is the sum of the air intervals on the optical axis of any two adjacent lenses from the first lens to the seventh lens.
  • TTL/ ⁇ AT when TTL/ ⁇ AT>4, the distance between adjacent lenses and the optical axis is too small, which increases tolerance sensitivity, is not conducive to lens assembly, and increases processing difficulty.
  • TTL/ ⁇ AT ⁇ 2.5 the total length of the system is too short, which is not conducive to realizing the telephoto characteristic.
  • the value of TTL/ ⁇ AT may be 2.5, 2.78, 3.15, 3.54, 3.8, 4, and so on.
  • the optical system satisfies the conditional formula: TTL/EPD ⁇ 3; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and EPD is the The entrance pupil diameter of the optical system.
  • TTL/EPD the conditional formula: TTL/EPD ⁇ 3; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and EPD is the The entrance pupil diameter of the optical system.
  • the optical system satisfies the conditional formula: 0.5 ⁇
  • the combined effective focal length of the lens, f is the effective focal length of the optical system.
  • the combined effective focal length of the fourth lens to the seventh lens together to contribute to the entire system is too small, causing excessive light deflection, which is not conducive to aberration correction, and finally leads to Image quality is reduced.
  • the proportion of the total length of the fourth lens to the seventh lens in the total length of the system is too high, which is not conducive to the miniaturization of the system; and the overall bending force of the fourth lens to the seventh lens is insufficient, making it difficult to effectively balance The aberration of the first lens and the second lens as a whole.
  • may be 0.5, 0.8, 1.2, 1.5, 1.8, 2, and so on.
  • the optical system satisfies the conditional formula: Y11/f ⁇ 0.3; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and f is the effective focal length of the optical system.
  • Y11/f is the effective semi-aperture of the object side of the first lens
  • f is the effective focal length of the optical system.
  • the optical system of this embodiment includes sequentially from the object side to the image side:
  • the second lens L2 has a positive bending force, and the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is convex at the near optical axis;
  • the third lens L3 has a negative bending force, and the object side S5 of the third lens L3 is concave at the near optical axis, and the image side S6 is concave at the near optical axis;
  • the fourth lens L4 has a negative bending force, and the object side S7 of the fourth lens L4 is a convex surface at the near optical axis, and the image side S8 is a concave surface at the near optical axis;
  • the fifth lens L5 has a negative bending force
  • the object side S9 of the fifth lens L5 is concave at the near optical axis
  • the image side S10 is concave at the near optical axis.
  • the sixth lens L6 has a positive bending force, the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is convex at the near optical axis.
  • the seventh lens L7 has a negative bending force
  • the object side S13 of the seventh lens L7 is concave at the near optical axis
  • the image side S14 is concave at the near optical axis.
  • the materials of the first lens L1 to the seventh lens L7 are all plastic, which can help the optical system to achieve lightweight design.
  • the optical system also includes a diaphragm ST0, an infrared filter IR and an imaging plane IMG.
  • the diaphragm ST0 is arranged on the object side of the first lens L1, and can be arranged at the circumference of the first lens L1, or on the object side S1 of the first lens L1, or arranged on the object side S1 of the first lens L1. At positions with a separation distance, the diaphragm STO is used to control the amount of light entering.
  • the stop ST0 may also be disposed on the object side and the image side of other lenses.
  • the infrared filter IR is arranged on the image side of the seventh lens L7, which includes the object side S15 and the image side S16, and the infrared filter IR is used to filter out infrared light, so that the light entering the imaging surface IMG is visible light, and the visible light is The wavelength is 380nm-780nm.
  • the infrared filter IR is made of glass and can be coated on glass.
  • the imaging plane IMG is the image plane of the optical system, and most of its area overlaps with the effective pixel area of the electronic photosensitive element.
  • Table 1a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of 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
  • Semi-FOV is half of the maximum field angle of the optical system in the diagonal direction of the electronic photosensitive element
  • TTL is the object side S1 of the first lens L1 The distance on the optical axis to the imaging plane IMG.
  • the object side surface and the image side surface of each lens of the first lens L1 to the seventh lens L7 are aspherical, and the surface type x of the aspherical lens can be defined by but not limited to the following aspherical formula:
  • x is the maximum vector height of the distance from the vertex of the aspheric surface when the aspheric surface is at a position of height h along the optical axis;
  • k is the conic coefficient;
  • Ai is the correction coefficient of the i-th order of the aspheric surface.
  • Table 1b gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspheric mirror surfaces in the first embodiment.
  • FIG. 1b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the first embodiment.
  • the reference wavelength of the astigmatism curve and the distortion curve is 587.5618nm, among which, the longitudinal spherical aberration curve represents the deviation of the focusing point of the light of different wavelengths after passing through each lens of the optical system; the astigmatic curve is curved in the meridional image plane and the sagittal image plane. ;
  • the distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 1b that the optical system provided in the first embodiment can achieve good imaging quality.
  • the optical system of this embodiment includes sequentially from the object side to the image side:
  • the first lens L1 has a positive bending force, and 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 second lens L2 has a positive bending force, and the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is convex at the near optical axis;
  • the third lens L3 has a negative bending force, and the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is concave at the near optical axis;
  • the fourth lens L4 has a negative bending force, and the object side S7 of the fourth lens L4 is a convex surface at the near optical axis, and the image side S8 is a concave surface at the near optical axis;
  • the fifth lens L5 has a positive bending force
  • the object side S9 of the fifth lens L5 is concave at the near optical axis
  • the image side S10 is convex at the near optical axis.
  • the sixth lens L6 has a negative bending force, the object side S11 of the sixth lens L6 is concave at the near optical axis, and the image side S12 is convex at the near optical axis.
  • the seventh lens L7 has a negative bending force
  • the object side S13 of the seventh lens L7 is convex at the near optical axis
  • the image side S14 is concave at the near optical axis.
  • Table 2a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of 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
  • Semi-FOV is half of the maximum field angle of the optical system in the diagonal direction of the electronic photosensitive element
  • TTL is the object side S1 of the first lens L1 The distance on the optical axis to the imaging plane IMG.
  • Table 2b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.
  • FIG. 2b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the second embodiment.
  • the reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 2b that the optical system provided in the second embodiment can achieve good imaging quality.
  • the optical system of this embodiment includes sequentially from the object side to the image side:
  • the first lens L1 has a positive bending force, and 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 second lens L2 has a positive bending force, and the object side S3 of the second lens L2 is a convex surface at the near optical axis, and the image side S4 is a concave surface at the near optical axis;
  • the third lens L3 has a positive bending force, and the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is concave at the near optical axis;
  • the fourth lens L4 has a negative bending force, and the object side S7 of the fourth lens L4 is a convex surface at the near optical axis, and the image side S8 is a concave surface at the near optical axis;
  • the fifth lens L5 has a positive bending force
  • the object side S9 of the fifth lens L5 is concave at the near optical axis
  • the image side S10 is convex at the near optical axis.
  • the sixth lens L6 has a negative bending force, the object side S11 of the sixth lens L6 is concave at the near optical axis, and the image side S12 is convex at the near optical axis.
  • the seventh lens L7 has a negative bending force
  • the object side S13 of the seventh lens L7 is convex at the near optical axis
  • the image side S14 is concave at the near optical axis.
  • Table 3a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained with light having a wavelength of 587.5618 nm, and the units of 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
  • Semi-FOV is half of the maximum field angle of the optical system in the diagonal direction of the electronic photosensitive element
  • TTL is the object side S1 of the first lens L1 The distance on the optical axis to the imaging plane IMG.
  • Table 3b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.
  • FIG. 3b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the third embodiment.
  • the reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 3b that the optical system provided in the third embodiment can achieve good imaging quality.
  • the optical system of this embodiment includes sequentially from the object side to the image side:
  • the first lens L1 has a positive bending force, and the object side S1 of the first lens L1 is a convex surface at the near optical axis, and the image side S2 is a convex surface at the near optical axis;
  • the third lens L3 has a negative bending force, and the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is concave at the near optical axis;
  • the fourth lens L4 has a negative bending force, and the object side S7 of the fourth lens L4 is a convex surface at the near optical axis, and the image side S8 is a concave surface at the near optical axis;
  • the fifth lens L5 has a positive bending force
  • the object side S9 of the fifth lens L5 is concave at the near optical axis
  • the image side S10 is convex at the near optical axis.
  • the sixth lens L6 has a negative bending force, the object side S11 of the sixth lens L6 is concave at the near optical axis, and the image side S12 is convex at the near optical axis.
  • the seventh lens L7 has a negative bending force
  • the object side S13 of the seventh lens L7 is convex at the near optical axis
  • the image side S14 is concave at the near optical axis.
  • Table 4a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of 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
  • Semi-FOV is half of the maximum field angle of the optical system in the diagonal direction of the electronic photosensitive element
  • TTL is the object side S1 of the first lens L1 The distance on the optical axis to the imaging plane IMG.
  • Table 4b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.
  • FIG. 4b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the fourth embodiment.
  • the reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 4b that the optical system provided in the fourth embodiment can achieve good imaging quality.
  • the optical system of this embodiment includes sequentially from the object side to the image side:
  • the first lens L1 has a positive bending force, and 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 second lens L2 has a positive bending force, and the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is convex at the near optical axis;
  • the fifth lens L5 has a positive bending force
  • the object side S9 of the fifth lens L5 is concave at the near optical axis
  • the image side S10 is convex at the near optical axis.
  • the sixth lens L6 has a negative bending force, the object side S11 of the sixth lens L6 is concave at the near optical axis, and the image side S12 is convex at the near optical axis.
  • the seventh lens L7 has a negative bending force.
  • 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.
  • Table 5a shows a table of characteristics of the optical system of this embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of 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
  • Semi-FOV is half of the maximum field angle of the optical system in the diagonal direction of the electronic photosensitive element
  • TTL is the object side S1 of the first lens L1 The distance on the optical axis to the imaging plane IMG.
  • Table 5b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.
  • FIG. 5b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the fifth embodiment.
  • the reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 5b that the optical system provided in the fifth embodiment can achieve good imaging quality.
  • Table 6 shows f/TTL, FNO/(ImgH*2), Y11/Y72, BF/CT67, (Y72*TTL)/(ET7*f), Y11/Y72, BF/CT67, (Y72*TTL)/(ET7*f), Values of f123/R32, TTL/ ⁇ AT, TTL/EPD,
  • the unit of FNO/(ImgH*2) is millimeter -1 (mm -1 )
  • the optical systems in the first to fifth embodiments all satisfy the following conditional expressions: f/TTL>1, 0mm -1 ⁇ FNO/(ImgH*2) ⁇ 5mm -1 , Y11/Y72 ⁇ 0.6, 1 ⁇ BF/CT67 ⁇ 3, 6 ⁇ (Y72*TTL)/(ET7*f) ⁇ 13, 0 ⁇ f123/R32 ⁇ 10, 2.5 ⁇ TTL/ ⁇ AT ⁇ 4, TTL/EPD ⁇ 3, 0.5 ⁇

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

L'invention concerne un système optique, un module de caméra et un dispositif électronique. Le système optique comprend séquentiellement du côté objet au côté image : une première lentille (L1) ayant une réfringence positive, la surface côté objet (S1) de celle-ci étant convexe à proximité de l'axe optique ; une deuxième lentille (L2) ayant une réfringence ; une troisième lentille (L3) ayant une réfringence, la surface côté image (S6) de celle-ci étant concave à proximité de l'axe optique ; une quatrième lentille (L4) ayant une réfringence négative, le côté objet (S7) de celle-ci étant convexe à proximité de l'axe optique, et le côté image (S8) de celle-ci étant concave à proximité de l'axe optique ; une cinquième lentille (L5) ayant une réfringence, la surface côté objet (S9) de celle-ci étant concave à proximité de l'axe optique ; une sixième lentille (L6) ayant une réfringence, la surface côté image (S12) de celle-ci étant convexe à proximité de l'axe optique ; et une septième lentille (L7) ayant une réfringence négative, la surface côté image (S14) de celle-ci étant concave à proximité de l'axe optique, à la fois la surface côté objet (S13) et la surface côté Image (S14) de celle-ci étant asphériques, et au moins l'une de la surface côté objet (S13) et de la surface côté image (S14) étant pourvue d'au moins un point d'inflexion. En configurant correctement la réfringence et la forme de surface de la première lentille (L1) à la septième lentille (L7) et en fournissant le point d'inflexion, le système optique peut garantir à la fois la longueur focale effective (f) et la longueur totale du système pour obtenir une longueur focale effective suffisamment longue (f) et une longueur de système globale courte.
PCT/CN2020/111764 2020-08-27 2020-08-27 Système optique, module de caméra et dispositif électronique WO2022041054A1 (fr)

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CN107664817A (zh) * 2017-10-19 2018-02-06 瑞声科技(新加坡)有限公司 摄像光学镜头
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CN108710193A (zh) * 2015-02-17 2018-10-26 大立光电股份有限公司 摄影系统及取像装置
CN110068914A (zh) * 2018-01-24 2019-07-30 三星电机株式会社 光学成像系统
US20200233187A1 (en) * 2017-12-12 2020-07-23 Zhejiang Sunny Optical Co., Ltd. Optical imaging lens assembly

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CN104950424A (zh) * 2014-03-28 2015-09-30 三星电机株式会社 镜头模块
CN108375822A (zh) * 2014-07-22 2018-08-07 三星电机株式会社 光学系统
CN108710193A (zh) * 2015-02-17 2018-10-26 大立光电股份有限公司 摄影系统及取像装置
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* Cited by examiner, † Cited by third party
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CN117233932B (zh) * 2023-11-10 2024-02-20 江西联益光学有限公司 光学镜头

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