WO2022088086A1 - Système d'imagerie optique, module photographique et dispositif électronique - Google Patents

Système d'imagerie optique, module photographique et dispositif électronique Download PDF

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Publication number
WO2022088086A1
WO2022088086A1 PCT/CN2020/125458 CN2020125458W WO2022088086A1 WO 2022088086 A1 WO2022088086 A1 WO 2022088086A1 CN 2020125458 W CN2020125458 W CN 2020125458W WO 2022088086 A1 WO2022088086 A1 WO 2022088086A1
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Prior art keywords
lens
imaging system
optical imaging
object side
optical
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PCT/CN2020/125458
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English (en)
Chinese (zh)
Inventor
王妮妮
刘彬彬
李明
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欧菲光集团股份有限公司
江西晶超光学有限公司
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Priority to PCT/CN2020/125458 priority Critical patent/WO2022088086A1/fr
Publication of WO2022088086A1 publication Critical patent/WO2022088086A1/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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the invention relates to the technical field of optical imaging, in particular to an optical imaging system, an imaging module and an electronic device.
  • An embodiment of the present application provides an optical imaging system, which includes sequentially from the object side to the image side:
  • At least one lens among the first lens to the fourth lens has a non-rotationally symmetrical aspheric surface
  • optical imaging system satisfies the following conditional formula:
  • BL is the shortest distance from the image side surface of the fourth lens to the imaging surface of the optical imaging system parallel to the optical axis
  • f is the effective focal length of the optical imaging system.
  • the above-mentioned optical imaging system realizes the lightness and thinness and short overall length of the imaging module through compact space arrangement and reasonable distribution of bending force, and has low optical sensitivity and excellent imaging quality;
  • the non-rotationally symmetrical aspheric surface increases the degree of freedom of the meridional plane and corrects the image quality, which can be mass-produced and processed to meet the current market demand.
  • it also includes:
  • a diaphragm is arranged between any two lenses among the first lens to the fourth lens.
  • the diaphragm can limit the amount of light passing through the optical imaging system.
  • the optical imaging system satisfies the following conditional formula:
  • bh is the maximum effective radius of the image side of the lens closest to the object side of the aperture
  • ah is the maximum effective radius of the object side of the lens closest to the object side of the aperture
  • the change of the refraction angle of the incident light is relatively moderate, which can prevent the refraction change from being too strong and cause more aberrations, and can realize a large angle of view.
  • the optical imaging system satisfies the following conditional formula:
  • hmax is the maximum effective radius of each surface of the first lens to the fourth lens
  • FOV is the maximum angle of view of the optical imaging system.
  • the optical imaging system satisfies the following conditional formula:
  • f is the effective focal length of the optical imaging system
  • f34 is the combined focal length of the third lens and the fourth lens.
  • the optical imaging system satisfies the following conditional formula:
  • f is the effective focal length of the optical imaging system
  • FOV is the maximum field angle of the optical imaging system
  • the optical imaging system satisfies the following conditional formula:
  • V1 is the Abbe number of the first lens
  • V2 is the Abbe number of the second lens
  • V3 is the Abbe number of the third lens
  • V4 is the Abbe number of the fourth lens.
  • the optical imaging system satisfies the following conditional formula:
  • TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system
  • IMGH is half of the image height corresponding to the maximum angle of view of the optical imaging system.
  • An embodiment of the present application also provides an imaging module, including:
  • a photosensitive element, the photosensitive element is arranged on the image side of the optical imaging system.
  • the optical imaging system in the above-mentioned imaging module realizes the lightness and thinness and short overall length of the imaging module through compact spatial arrangement and reasonable distribution of bending force, and has low optical sensitivity and excellent imaging.
  • the degree of freedom of the meridional plane is increased and the image quality is corrected through the non-rotationally symmetrical aspheric surface, which can be mass-produced and processed to meet the current market demand.
  • An embodiment of the present application also provides an electronic device, including:
  • the image capturing module is installed on the casing.
  • the optical imaging system in the above electronic device realizes the lightness and thinness of the imaging module and the short overall length through compact spatial arrangement and reasonable distribution of bending force, and has low optical sensitivity and excellent imaging quality; At the same time, under the limited number of lenses, through the non-rotationally symmetrical aspheric surface, the degree of freedom of the meridional plane is increased and the image quality is corrected, which can be mass-produced and processed to meet the needs of the current market.
  • FIG. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention.
  • FIG. 2 is the case where the RMS spot diameter of the optical imaging system according to the first embodiment of the present invention is within the first quadrant.
  • FIG. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.
  • FIG. 4 is a case where the RMS spot diameter of the optical imaging system according to the second embodiment of the present invention is within the first quadrant.
  • FIG. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention.
  • FIG. 6 is the case where the RMS spot diameter of the optical imaging system according to the third embodiment of the present invention is within the first quadrant.
  • FIG. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.
  • FIG. 8 shows the case where the RMS spot diameter of the optical imaging system according to the fourth embodiment of the present invention is within the first quadrant.
  • FIG. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.
  • FIG. 10 shows the case where the RMS spot diameter of the optical imaging system according to the fifth embodiment of the present invention is within the first quadrant.
  • FIG. 11 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.
  • FIG. 12 shows the case where the RMS spot diameter of the optical imaging system according to the sixth embodiment of the present invention is within the first quadrant.
  • FIG. 13 is a schematic structural diagram of an optical imaging system according to a seventh embodiment of the present invention.
  • FIG. 14 shows the case where the RMS spot diameter of the optical imaging system of the seventh embodiment of the present invention is within the first quadrant.
  • FIG. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
  • the first lens L1 The first lens L1
  • the third lens L3 is the third lens L3
  • an embodiment of the present invention provides an optical imaging system 10 , which includes a first lens L1 having a bending force, a second lens L2 having a bending force, and a first lens having A triple lens L3 and a fourth lens L4 having a bending power.
  • the first lens L1 has an object side S1 and an image side S2; the second lens L2 has an object side S4 and an image side S5; the third lens L3 has an object side S6 and an image side S7; the fourth lens L4 has an object side S8 and an image side S9; At least one lens among the first lens L1 to the fourth lens L4 has a rotationally asymmetric aspheric surface.
  • optical imaging system 10 satisfies the following conditional formula:
  • BL is the shortest distance from the image side S9 of the fourth lens L4 to the imaging surface S12 of the optical imaging system 10 parallel to the optical axis direction
  • f is the effective focal length of the optical imaging system 10 .
  • the above-mentioned optical imaging system 10 realizes the lightness and thinness of the imaging module and the characteristics of short overall length, low optical sensitivity and excellent imaging quality through compact spatial arrangement and reasonable bending force distribution; and Under the limited number of lenses, the non-rotationally symmetrical aspheric surface increases the degree of freedom of the meridian plane and corrects the image quality, which can be mass-produced and processed to meet the needs of the current market.
  • the optical imaging system 10 further satisfies the following conditional formula: 0.539 ⁇ BL/f ⁇ 1.218; in this way, the back focal length of the optical imaging system 10 can be shortened, and the overall volume can be avoided to be too large, which is beneficial to be mounted on a miniaturized electronic device; at the same time, it can be The adjustment range of the auto focus assembly when the optical imaging system 10 is equipped with a photosensitive chip is increased. However, when the value of BL/f exceeds the above range, it is unfavorable to shorten the back focal length of the optical imaging system 10 , making the overall volume too large, and it is unfavorable to be mounted on a miniaturized electronic device.
  • the optical imaging system 10 further includes a stop STO.
  • the diaphragm STO is disposed between any two lenses among the first lens L1 to the fourth lens L4 , so that the diaphragm STO can limit the light passing amount of the optical imaging system 10 .
  • the optical imaging system 10 further includes an infrared filter L5, and the infrared filter L5 has an object side S10 and an image side S11.
  • the infrared filter L5 is arranged on the image side of the fourth lens L4 to filter out light in other wavelength bands such as visible light, and only let the infrared light pass through, so that the optical imaging system 10 can be used in a dark environment and other special application scenarios It can also be imaged below.
  • the first lens L1 , the second lens L2 , the third lens L3 and the fourth lens L4 are all made of plastic.
  • the lenses made of plastic can reduce the weight of the optical imaging system 10 and the production cost.
  • the first lens L1 , the second lens L2 , the third lens L3 and the fourth lens L4 are all made of glass.
  • the optical imaging system 10 can withstand higher temperatures and has better performance optical performance.
  • only the first lens L1 may be made of glass, and other lenses may be made of plastic.
  • the first lens L1 closest to the object side can better withstand the influence of the ambient temperature on the object side , and because the other lenses are made of plastic materials, the optical imaging system 10 maintains a low production cost.
  • the material of the first lens L1 is glass, and the materials of other lenses can be arbitrarily combined.
  • the optical imaging system 10 satisfies the following conditional formula:
  • bh is the maximum effective radius of the image side of the lens closest to the object side of the stop STO
  • ah is the maximum effective radius of the object side of the lens closest to the object side of the stop STO.
  • the optical imaging system 10 further satisfies the following conditional formula: 0.216 ⁇ bh-ah ⁇ 1.174; in this way, the change of the refraction angle of the incident light is relatively gentle, which can prevent the refraction change from being too strong and cause more aberrations, and can realize a large field of view horn.
  • the value of bh-ah exceeds the above-mentioned range, the change of the refraction angle of the incident light is too strong and more aberrations are likely to be generated.
  • the optical imaging system 10 satisfies the following conditional formula:
  • hmax is the maximum effective radius of each surface of the first lens L1 to the fourth lens L4
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the optical imaging system 10 further satisfies the following conditional formula: 0.01 mm/° ⁇ hmax/FOV ⁇ 0.013 mm/°; in this way, miniaturization and a large field of view can be achieved.
  • conditional formula 0.01 mm/° ⁇ hmax/FOV ⁇ 0.013 mm/°; in this way, miniaturization and a large field of view can be achieved.
  • hmax/FOV exceeds the above-mentioned range, it is disadvantageous to achieve miniaturization and a large angle of view of the optical imaging system 10 .
  • the optical imaging system 10 satisfies the following conditional formula:
  • f is the effective focal length of the optical imaging system 10
  • f34 is the combined focal length of the third lens L3 and the fourth lens L4.
  • the optical imaging system 10 further satisfies the following conditional formula: 0.13 ⁇ f/f34 ⁇ 0.983; in this way, through the distribution of the bending force, a large angle of view can be realized.
  • conditional formula 0.13 ⁇ f/f34 ⁇ 0.983
  • the optical imaging system 10 satisfies the following conditional formula:
  • f is the effective focal length of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the optical imaging system 10 further satisfies the following conditional formula: 0.01 mm/° ⁇ f/FOV ⁇ 0.015 mm/°; in this way, the large field of view and the effective focal length of the optical imaging system 10 can be balanced. However, when the value of f/FOV exceeds the above range, it is unfavorable to balance the large angle of view and the effective focal length of the optical imaging system 10 .
  • the optical imaging system 10 satisfies the following conditional formula:
  • V1 is the Abbe number of the first lens L1 under d light
  • V2 is the Abbe number of the second lens L2 under d light
  • V3 is the Abbe number of the third lens L3 under d light
  • V4 is the first Abbe number of four-lens L4 in d light.
  • the optical imaging system 10 further satisfies the following conditional formula: 46.755 ⁇ (V1+V2+V3+V4)/4 ⁇ 47.036; in this way, chromatic aberration can be corrected.
  • conditional formula 46.755 ⁇ (V1+V2+V3+V4)/4 ⁇ 47.036; in this way, chromatic aberration can be corrected.
  • the value of (V1+V2+V3+V4)/4 exceeds the above-mentioned range, it is disadvantageous to correct the chromatic aberration.
  • the optical imaging system 10 satisfies the following conditional formula:
  • TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the imaging surface S12 of the optical imaging system 10
  • IMGH is half of the image height corresponding to the maximum angle of view of the optical imaging system 10 .
  • the optical imaging system 10 further satisfies the following conditional formula: 2.053 ⁇ TTL/IMGH ⁇ 3.608; in this way, the miniaturization of the imaging module can be realized.
  • TTL/IMGH exceeds the above range, it is not conducive to realizing the miniaturization of the image capturing module.
  • the optical imaging system 10 satisfies the following conditional formula:
  • L4S1C5 is the coefficient of the fourth term Zernike polynomial of the object side surface S8 of the fourth lens L4, and V4 is the Abbe number of the fourth lens L4.
  • the optical imaging system 10 further satisfies the following conditional formula: -0.08 ⁇ L4S1C5*V4 ⁇ 0.128; in this way, mutually orthogonal polynomials can be used to fit a non-rotationally symmetric aspheric surface inside the unit circle, in particular, the x-direction can be balanced by L4S1C5
  • the primary astigmatism and the use of materials with small dispersion can realize a free-form surface through a resin molding process, and improve the image quality of the optical imaging system 10 with a large field of view.
  • the optical imaging system 10 satisfies the following conditional formula:
  • L4S1C6 is the coefficient of the fifth term Zernike polynomial of the object side surface S8 of the fourth lens L4, and V4 is the Abbe number of the fourth lens L4.
  • the optical imaging system 10 further satisfies the following conditional formula: -7.041 ⁇ L4S1C6*V4 ⁇ -2.351; in this way, mutually orthogonal polynomials can be used to fit a non-rotationally symmetric aspheric surface inside the unit circle, in particular, the y-direction is balanced by L4S1C6
  • the primary astigmatism and the use of materials with small dispersion can enable the surface of any shape to be fitted with multiple base surfaces, thereby improving the image quality of the optical imaging system 10 with a large field of view.
  • the optical imaging system 10 satisfies the following conditional formula:
  • L4S1C2 is the coefficient of the first term of the Zernike polynomial of the object side surface S8 of the fourth lens L4
  • FOV is the maximum angle of view of the optical imaging system 10 .
  • the optical imaging system 10 further satisfies the following conditional formula: -30.626 ⁇ L4S1C2*FOV ⁇ -11.752; in this way, by increasing the meridional tilt control, the wide-angle and distortion of the optical imaging system 10 can be balanced.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a negative inflection force, a second lens L2 with a positive inflection force, and a positive inflection force.
  • the object side S1 of the first lens L1 is convex at the near optical axis
  • the image side S2 of the first lens L1 is concave at the near optical axis
  • the object side S4 of the second lens L2 is concave at the near optical axis
  • the second lens L2 is concave at the near optical axis.
  • the image side S5 of the lens L2 is convex at the near optical axis
  • the object side S6 of the third lens L3 is convex at the near optical axis
  • the image side S7 of the third lens L3 is convex at the near optical axis
  • the fourth lens L4 The object side S8 is convex at the near optical axis
  • the image side S9 of the fourth lens L4 is concave at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is concave near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 1 shows a table of characteristics of the optical imaging system 10 of the present embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 2 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surfaces in the first embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 3 gives the aspherical coefficients that can be used in the lens of the first embodiment for a rotational symmetry.
  • FIG. 2 shows the size of the RMS spot diameter of the optical imaging system in the first embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm. It can be seen from FIG. 2 that the optical imaging system provided in the first embodiment can achieve good imaging quality.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a negative inflection force, a second lens L2 with a positive inflection force, and a negative inflection force.
  • the object side S1 of the first lens L1 is concave at the near optical axis
  • the image side S2 of the first lens L1 is convex at the near optical axis
  • the object side S4 of the second lens L2 is convex at the near optical axis
  • the second lens L2 is convex at the near optical axis.
  • the image side S5 of the lens L2 is convex at the near optical axis
  • the object side S6 of the third lens L3 is convex at the near optical axis
  • the image side S7 of the third lens L3 is concave at the near optical axis
  • the fourth lens L4 The object side S8 is convex at the near optical axis
  • the image side S9 of the fourth lens L4 is concave at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is concave near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 4 shows a table of characteristics of the optical imaging system of the present embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 5 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surfaces in the second embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 6 gives the non-rotationally symmetric aspherical coefficients that can be used for the lenses in the second embodiment.
  • FIG. 4 shows the size of the RMS spot diameter of the optical imaging system in the second embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a negative inflection force, a second lens L2 with a positive inflection force, and a positive inflection force.
  • the object side S1 of the first lens L1 is convex at the near optical axis
  • the image side S2 of the first lens L1 is concave at the near optical axis
  • the object side S4 of the second lens L2 is convex at the near optical axis
  • the second lens L2 is convex at the near optical axis.
  • the image side S5 of the lens L2 is convex at the near optical axis
  • the object side S6 of the third lens L3 is convex at the near optical axis
  • the image side S7 of the third lens L3 is convex at the near optical axis
  • the fourth lens L4 The object side S8 is convex at the near optical axis
  • the image side S8 of the fourth lens L4 is concave at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is concave near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 7 shows a table of characteristics of the optical imaging system of this embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 8 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surface in the third embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 9 gives the aspherical coefficients that can be used in the third embodiment of the lens asymmetrically.
  • FIG. 6 shows the size of the RMS spot diameter of the optical imaging system in the third embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a negative inflection force, a second lens L2 with a positive inflection force, and a positive inflection force.
  • the object side S1 of the first lens L1 is concave at the near optical axis
  • the image side S2 of the first lens L1 is convex at the near optical axis
  • the object side S4 of the second lens L2 is convex at the near optical axis
  • the second lens L2 is convex at the near optical axis.
  • the image side S5 of the lens L2 is convex at the near optical axis
  • the object side S6 of the third lens L3 is convex at the near optical axis
  • the image side S7 of the third lens L3 is convex at the near optical axis
  • the fourth lens L4 The object side S8 is convex at the near optical axis
  • the image side S9 of the fourth lens L4 is concave at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is concave near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 10 shows a table of characteristics of the optical imaging system of this embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 11 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surfaces in the fourth embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 12 gives the aspherical coefficients that can be used for the lenses in the fourth embodiment, which are not rotationally symmetric.
  • FIG. 8 shows the size of the RMS spot diameter of the optical imaging system in the fourth embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm. It can be seen from FIG. 8 that the optical imaging system provided in the fourth embodiment can achieve good imaging quality.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a positive inflection force, a second lens L2 with a negative inflection force, and a positive inflection force.
  • the object side S1 of the first lens L1 is concave at the near optical axis
  • the image side S2 of the first lens L1 is convex at the near optical axis
  • the object side S4 of the second lens L2 is concave at the near optical axis
  • the second lens L2 is concave at the near optical axis.
  • the image side S5 of the lens L2 is concave at the near optical axis
  • the object side S6 of the third lens L3 is convex at the near optical axis
  • the image side S7 of the third lens L3 is convex at the near optical axis
  • the fourth lens L4 The object side S8 is convex at the near optical axis
  • the image side S9 of the fourth lens L4 is concave at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is concave near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 13 shows a table of characteristics of the optical imaging system of the present embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 14 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surface in the fifth embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 15 gives the aspherical coefficients that can be used for the lenses in the fifth embodiment, which are not rotationally symmetric.
  • FIG. 10 shows the size of the RMS spot diameter of the optical imaging system in the fifth embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm. It can be seen from Fig. 10 that the optical imaging system provided in the fifth embodiment can achieve good imaging quality.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a negative inflection force, a second lens L2 with a positive inflection force, and a positive inflection force.
  • the object side S1 of the first lens L1 is concave at the near optical axis
  • the image side S2 of the first lens L1 is convex at the near optical axis
  • the object side S4 of the second lens L2 is convex at the near optical axis
  • the second lens L2 is convex at the near optical axis.
  • the image side S5 of the lens L2 is convex at the near optical axis
  • the object side S6 of the third lens L3 is concave at the near optical axis
  • the image side S7 of the third lens L3 is convex at the near optical axis
  • the fourth lens L4 The object side S8 is convex at the near optical axis
  • the image side S9 of the fourth lens L4 is concave at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is concave near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 16 shows a table of characteristics of the optical imaging system of the present embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 17 gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surface in the sixth embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 18 gives the non-rotationally symmetric aspherical coefficients that can be used for the lenses in the sixth embodiment.
  • FIG. 12 shows the size of the RMS spot diameter of the optical imaging system in the sixth embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm. It can be seen from FIG. 12 that the optical imaging system provided in the sixth embodiment can achieve good imaging quality.
  • the optical imaging system 10 in this embodiment includes a diaphragm STO from the object side to the image side, a first lens L1 with a negative inflection force, a second lens L2 with a positive inflection force, and a positive inflection force.
  • the object side S1 of the first lens L1 is concave at the near optical axis
  • the image side S2 of the first lens L1 is concave at the near optical axis
  • the object side S4 of the second lens L2 is concave at the near optical axis
  • the second lens L2 is concave at the near optical axis.
  • the image side S5 of the lens L2 is convex at the near optical axis
  • the object side S6 of the third lens L3 is convex at the near optical axis
  • the image side S7 of the third lens L3 is convex at the near optical axis
  • the fourth lens L4 The object side S8 is concave at the near optical axis
  • the image side S9 of the fourth lens L4 is convex at the near optical axis.
  • the object side S1 of the first lens L1 is convex at the near circumference
  • the image side S2 of the first lens L1 is concave at the near circumference
  • the object side S4 of the second lens L2 is concave at the near circumference
  • the second lens L2 is concave at the near circumference.
  • the image side S5 is convex near the circumference
  • the object side S6 of the third lens L3 is convex near the circumference
  • the image side S7 of the third lens L3 is convex near the circumference
  • the object side S8 of the fourth lens L4 is near the circumference.
  • the circumference is concave
  • the image side S9 of the fourth lens L4 is convex near the circumference.
  • the light emitted or reflected by the subject enters the optical imaging system 10 from the object side direction, and sequentially passes through the diaphragm STO, the first lens L1, the second lens L2, and the third lens L3 , the fourth lens L4 and the infrared filter L5, and finally converge on the imaging surface S12.
  • Table 19 shows a table of characteristics of the optical imaging system of the present embodiment, the reference wavelength of focal length, refractive index and Abbe number is 587.56 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).
  • f is the effective focal length of the optical imaging system 10
  • FNO is the aperture size of the optical imaging system 10
  • FOV is the maximum field angle of the optical imaging system 10 .
  • the rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • ⁇ is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis;
  • k is the conic coefficient;
  • Ai is the i-th order coefficient of the aspheric surface.
  • Table 20 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the rotationally symmetric aspheric surface in the seventh embodiment.
  • the non-rotationally symmetric aspheric surface type in the first lens L1 to the fourth lens L4 is defined by the following formula:
  • Table 21 gives the aspherical coefficients that can be used for the lenses in the seventh embodiment of the present invention.
  • FIG. 14 shows the size of the RMS spot diameter of the optical imaging system in the seventh embodiment at different image height positions in the first quadrant, that is, the relationship between the RMS spot diameter and the real light image height.
  • the unit of the smallest RMS spot diameter is mm
  • the unit of the largest RMS spot diameter is mm
  • the unit of the mean value of the RMS spot diameter is mm
  • the unit of the standard deviation of the RMS spot diameter is mm. It can be seen from FIG. 14 that the optical imaging system provided in the seventh embodiment can achieve good imaging quality.
  • Table 22 shows BL/f, bh-ah, hmax/FOV, f/f34, f/FOV, (V1+V2+V3+V4)/4 in the optical imaging systems of the first to seventh embodiments , TTL/IMGH, L4S1C5*V4, L4S1C6*V4, and L4S1C2*FOV values.
  • the optical imaging system 10 of the embodiment of the present invention can be applied to the imaging module 100 of the embodiment of the present invention.
  • the imaging module 100 includes the photosensitive element 20 and the optical imaging system 10 of any of the above embodiments.
  • the photosensitive element 20 is provided on the image side of the optical imaging system 10 .
  • the photosensitive element 20 can be a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensor or a charge-coupled device (CCD, Charge-coupled Device).
  • CMOS complementary metal oxide semiconductor
  • CCD Charge-coupled Device
  • the optical imaging system 10 in the above-mentioned imaging module 100 realizes the lightness and thinness of the imaging module, has the characteristics of short overall length, and has low optical sensitivity and Excellent imaging quality; and under the limited number of lenses, through the non-rotationally symmetrical aspheric surface, the degree of freedom of the meridian plane is increased and the image quality is corrected, which can be mass-produced and processed to meet the needs of the current market.
  • the image capturing module 100 of the embodiment of the present invention can be applied to the electronic device 1000 of the embodiment of the present invention.
  • the electronic device 1000 includes a casing 200 and an imaging module 100 , and the imaging module 100 is installed on the casing 200 .
  • the electronic device 1000 of the embodiment of the present invention includes, but is not limited to, a driving recorder, a smart phone, a tablet computer, a notebook computer, an electronic book reader, a portable multimedia player (PMP), a portable telephone, a video telephone, and a digital still camera , mobile medical devices, wearable devices and other electronic devices that support imaging.
  • a driving recorder a smart phone
  • a tablet computer a notebook computer
  • an electronic book reader a portable multimedia player (PMP)
  • PMP portable telephone
  • video telephone a digital still camera
  • mobile medical devices wearable devices and other electronic devices that support imaging.
  • the optical imaging system 10 in the above-mentioned electronic device 1000 realizes the lightness and thinness of the imaging module and has the characteristics of short overall length, low optical sensitivity and excellent bending force distribution through compact space arrangement and reasonable bending force distribution. Image quality; and under the limited number of lenses, through the non-rotationally symmetrical aspheric surface, the degree of freedom of the meridian plane is increased and the image quality is corrected, which can be mass-produced and processed to meet the needs of the current market.

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

Abstract

L'invention concerne un système d'imagerie optique (10), un module photographique (100) et un dispositif électronique (1000). D'un côté objet à un côté image, le système d'imagerie optique (10) comprend séquentiellement une première lentille (L1) ayant une réfringence, une deuxième lentille (L2) ayant une réfringence, une troisième lentille (L3) ayant une réfringence et une quatrième lentille (L4) ayant une réfringence ; au moins l'une de la première lentille (L1) à la quatrième lentille (L4) a une surface asphérique non symétrique en rotation ; et le système d'imagerie optique satisfait l'expression conditionnelle suivante : 0≤BL/f≤2. Au moyen d'un agencement d'espace compact et d'une attribution de réfringence raisonnable, le système d'imagerie optique (10) réalise l'éclaircissement et l'amincissement, et la longueur totale courte du module photographique (100), et présente une faible sensibilité optique et une bonne qualité d'imagerie ; de plus, à condition que le nombre de lentilles soit limité, au moyen de la surface asphérique non symétrique en rotation, le degré de liberté d'un plan méridien est augmenté et la qualité d'image est corrigée, la production et le traitement par lots peuvent être effectués, et les exigences du marché actuel sont satisfaites.
PCT/CN2020/125458 2020-10-30 2020-10-30 Système d'imagerie optique, module photographique et dispositif électronique WO2022088086A1 (fr)

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CN104035191A (zh) * 2013-03-06 2014-09-10 佳能企业股份有限公司 变焦镜头
CN110007434A (zh) * 2019-04-04 2019-07-12 南京波长光电科技股份有限公司 一种基于自由曲面的消场曲及消像散的CO2远心f-theta镜头
CN111175948A (zh) * 2018-11-12 2020-05-19 佳能企业股份有限公司 光学镜头
WO2020174865A1 (fr) * 2019-02-27 2020-09-03 ソニー株式会社 Système de lentilles à longueur focale variable et dispositif d'imagerie

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US20140247505A1 (en) * 2013-03-01 2014-09-04 Ability Enterprise Co., Ltd. Zoom lens
CN104035191A (zh) * 2013-03-06 2014-09-10 佳能企业股份有限公司 变焦镜头
CN111175948A (zh) * 2018-11-12 2020-05-19 佳能企业股份有限公司 光学镜头
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