WO2021223238A1 - Lentille d'imagerie prenant en considération une correction de distorsion basée sur un traitement d'image, module de dispositif de prise de vues et dispositif d'imagerie - Google Patents

Lentille d'imagerie prenant en considération une correction de distorsion basée sur un traitement d'image, module de dispositif de prise de vues et dispositif d'imagerie Download PDF

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Publication number
WO2021223238A1
WO2021223238A1 PCT/CN2020/089259 CN2020089259W WO2021223238A1 WO 2021223238 A1 WO2021223238 A1 WO 2021223238A1 CN 2020089259 W CN2020089259 W CN 2020089259W WO 2021223238 A1 WO2021223238 A1 WO 2021223238A1
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WIPO (PCT)
Prior art keywords
image height
lens
imaging
dist
distortion
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PCT/CN2020/089259
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English (en)
Inventor
Daigo Katsuragi
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Guangdong Oppo Mobile Telecommunications Corp., Ltd.
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Application filed by Guangdong Oppo Mobile Telecommunications Corp., Ltd. filed Critical Guangdong Oppo Mobile Telecommunications Corp., Ltd.
Priority to PCT/CN2020/089259 priority Critical patent/WO2021223238A1/fr
Publication of WO2021223238A1 publication Critical patent/WO2021223238A1/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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present disclosure relates to an imaging lens which takes into consideration image processing-based distortion correction, a camera module, and an imaging device, and more specifically, to an imaging lens, a camera module, and an imaging device that are small and enable good optical performance and which take into consideration image processing-based distortion correction.
  • imaging lenses mounted on the imaging devices also require downsizing.
  • the imaging lenses mounted on imaging devices are expected to have higher resolution.
  • Such imaging lenses used in large imaging elements having high resolution are required to be high in resolution and small in size.
  • the present disclosure aims to solve at least one of the technical problems mentioned above. Accordingly, the present disclosure needs to provide an imaging lens, a camera module, and an imaging device.
  • an imaging lens which takes into consideration image processing-based distortion correction includes:
  • the imaging lens satisfies the following conditional expressions
  • ⁇ D is a full length of the imaging lens
  • Ymax is a maximum image height
  • Fno is an F number
  • Ya is an image height when a distortion amount before image processing-based distortion correction is performed is maximum, the image height being normalized to the maximum image height
  • Dist_A is a maximum distortion amount before image processing-based distortion correction is performed
  • Dist_B is a distortion amount when the image height is 50%of the maximum image height.
  • the imaging lens may further satisfy the following conditional expression,
  • Dist. is a distortion amount before image processing-based distortion correction is performed, which is obtained when an object point is taken at infinity.
  • the distortion amount when the image height is 50%of the maximum image height may satisfy the following conditional expression,
  • Dist_h is a distortion amount before image processing-based distortion correction is performed, which is obtained when the image height is 50%or more of the maximum image height
  • Yh is an arbitrary image height which is 50%or more of the maximum image height
  • ⁇ is a slope of a straight line which connects a point indicating the image height of 50%of the maximum image height on a distortion curve before image processing-based distortion correction is performed, and a point indicating the maximum image height on the distortion curve.
  • a surface on a side of an imaging surface of a most imaging surface side disposed lens may have a concave shape near the optical axis and a convex shape in a peripheral portion.
  • a most imaging surface side disposed lens may have an aspheric shape having an inflection point, and may be formed of plastic.
  • a camera module includes:
  • an image sensor comprising an imaging surface
  • an imaging device includes the camera module.
  • FIG. 1 is a diagram illustrating an outline of a camera module according to the present disclosure
  • FIG. 2 is a configuration diagram of a camera module according to a first example of the present disclosure
  • FIG. 3 is a diagram of a camera module according to the first example of the present disclosure illustrating a distortion curve before image processing-based distortion correction
  • FIG. 4 is a diagram of a camera module according to the first example of the present disclosure illustrating parameters related to conditional expressions of the present disclosure
  • FIG. 5 is an aberration diagram of the camera module according to the first example of the present disclosure.
  • FIG. 6 is a configuration diagram of a camera module according to a second example of the present disclosure.
  • FIG. 7 is a diagram of a camera module according to the second example of the present disclosure illustrating a distortion curve before image processing-based distortion correction
  • FIG. 8 is a diagram of a camera module according to the second example of the present disclosure illustrating parameters related to conditional expressions of the present disclosure
  • FIG. 9 is an aberration diagram of the camera module according to the second example of the present disclosure.
  • FIG. 10 is a configuration diagram of a camera module according to a third example of the present disclosure.
  • FIG. 11 is a diagram of a camera module according to the third example of the present disclosure illustrating a distortion curve before image processing-based distortion correction
  • FIG. 12 is a diagram of a camera module according to the third example of the present disclosure illustrating parameters related to conditional expressions of the present disclosure
  • FIG. 13 is an aberration diagram of the camera module according to the third example of the present disclosure.
  • FIG. 14 is a configuration diagram of a camera module according to a fourth example of the present disclosure.
  • FIG. 15 is a diagram of a camera module according to the fourth example of the present disclosure illustrating a distortion curve before image processing-based distortion correction
  • FIG. 16 is a diagram of a camera module according to the fourth example of the present disclosure illustrating parameters related to conditional expressions of the present disclosure
  • FIG. 17 is an aberration diagram of the camera module according to the fourth example of the present disclosure.
  • FIG. 18 is a configuration diagram of a camera module according to a fifth example of the present disclosure.
  • FIG. 19 is a diagram of a camera module according to the fifth example of the present disclosure illustrating a distortion curve before image processing-based distortion correction
  • FIG. 20 is a diagram of a camera module according to the fifth example of the present disclosure illustrating parameters related to conditional expressions of the present disclosure
  • FIG. 21 is an aberration diagram of the camera module according to the fifth example of the present disclosure.
  • FIG. 22 is a diagram of a camera module according to the comparative example of the present disclosure illustrating a distortion curve before image processing-based distortion correction
  • FIG. 23 is a diagram of a camera module according to the comparative example of the present disclosure illustrating parameters related to conditional expressions of the present disclosure.
  • a camera module 11 to which the present disclosure is applied is configured to focus incident light from a subject side (object side) on an imaging surface S of an imaging sensor 23 through an imaging lens 21 to acquire an image of the subject.
  • the camera module 11 to which the present disclosure is applied is configured to perform image processing-based distortion correction in addition to aberration correction based on the optical performance of the imaging lens 21 which is mounted on the camera module 11.
  • the specific configuration of image processing-based distortion correction is not particularly limited.
  • an image processing unit 24, such as a computer, which is electrically connected to the imaging sensor 23 may perform image processing-based distortion correction by correcting coordinates of each pixel of an image acquired from the image sensor 23 according to a predetermined correction formula.
  • the present disclosure is configured to enhance a linearity of a distortion curve before image processing-based distortion correction, in the image height of 50%or more of the maximum image height.
  • a specific configuration of the present disclosure will be given.
  • the camera module 11 to which the present disclosure is applied is configured as shown in FIGS. 2, 6, 10, 14, and 18, for example.
  • dash –dot lines represent the optical axes of the camera modules.
  • the camera module 11 includes an imaging lens 21, an optical filter 22 and an image sensor 23.
  • the imaging lens 21, taking into consideration the image processing-based distortion correction, is designed to maintain its good optical performance (i.e., good quality of the corrected image) .
  • the imaging lens 21 may be configured to perform optical image stabilization by means of an optical image stabilization mechanism which moves the imaging lens 21 in a direction where the camera shake is canceled (for example, a direction orthogonal to the optical axis) .
  • the imaging lens 21 includes at least one lens having a positive refractive power, and at least one lens having a negative refractive power.
  • the image sensor 23 is, for example, a solid-state image sensor such as a CMOS (Complementary Metal Oxide Semiconductor) or a CCD (Charge Coupled Device) .
  • the image sensor 23 has the imaging surface S which is an imaging plane of the imaging lens 21.
  • the image sensor 23 receives incident light from the subject (object side) via the imaging lens 21 and the optical filter 22, photoelectrically converts the light, and outputs an image data obtained by photoelectric conversion of the light to a subsequent stage.
  • the imaging lens 21 includes at least one lens having a positive refractive power and at least one lens having a negative refractive power, and satisfies the following formulas (1) and (2) :
  • ⁇ D is a full length of the imaging lens 21, that is, a distance on the optical axis from a vertex of the object side surface of the most object side disposed lens to an imaging surface S.
  • Ymax is a maximum image height.
  • Fno is an F number of the imaging lens 21.
  • the formula (2) shows a range of an amount of a change in the distortion curve when the image height is 50%or more of the maximum image height.
  • Ya is an image height when a distortion amount before image processing-based distortion correction is performed is maximum, the image height being normalized to the maximum image height.
  • Dist_A is a maximum distortion amount before image processing-based distortion correction is performed.
  • Dist_B is a distortion amount when the image height is 50%of the maximum image height.
  • the imaging lens 21 can be miniaturized and its good optical performance can be maintained effectively. If the amount of the change in the distortion curve when the image height is 50%or more deviates from the range shown in the formula (2) , it is difficult to sufficiently reduce the remaining distortion by means of image processing-based distortion correction.
  • the camera module 11 allows the miniaturization of the imaging lens 21 while maintaining a good optical performance of the imaging lens 21 by satisfying the above formulas (1) and (2) .
  • the most imaging surface S side disposed lens has, on the imaging surface S side, an aspheric shape having an inflection point in the vicinity of the lens edge.
  • a surface on the side of the imaging surface S of the most imaging surface S side disposed lens has a concave shape in the lens center (i.e. near the optical axis) and a convex shape in a peripheral portion (i.e. in the vicinity of an outer peripheral area) .
  • the back focus can be effectively shortened while maintaining good optical performance.
  • the imaging lens 21 can be miniaturized and its good optical performance can be maintained more effectively when the camera module 11 satisfies the following formula (3) :
  • Dist. is a distortion amount before image processing-based distortion correction is performed, which is obtained when an object point is taken at infinity.
  • the imaging lens 21 can be miniaturized and its good optical performance can be maintained more effectively when a distortion amount before image processing-based distortion correction, which is obtained when the image height is 50%or more of the maximum image height, satisfies the following formula (4) :
  • Dist_h is the distortion amount before image processing-based distortion correction is performed, which is obtained when the image height is 50%or more of the maximum image height.
  • Yh is an arbitrary image height which is 50%or more of the maximum image height.
  • ⁇ is a slope of a straight line which connects a point indicating the image height of 50%of the maximum image height on a distortion curve before image processing-based distortion correction is performed, and a point indicating the maximum image height on the distortion curve.
  • an aspheric lens in the imaging lens 21, particularly an aspheric lens of aspheric shape having an inflection point is formed of a plastic material (glass material) .
  • a lens having a size equal to or smaller than a specific size may be a lens formed of a plastic material, and a lens larger than the specific size may be a lens formed of a glass material. This is because it is difficult to form an aspheric lens or a relatively small lens using a material other than a plastic material.
  • Such a camera module 11 including the imaging lens 21 is applicable to compact digital devices (imaging devices) such as mobile phones, wearable cameras and surveillance cameras.
  • denotations of “first surface” or “1st surface” indicate a surface on the object side of the lens
  • denotations of “second surface” or “2nd surface” indicate a surface on the imaging surface S side of the lens.
  • “R” indicates the value of a central curvature radius (mm) of the surface.
  • “E + i” indicates an exponential expression with a base of 10, i.e., "10 i " .
  • “1.00 E +18" indicates "1.00 ⁇ 10 18 " .
  • Such an exponential expression is also applied to an aspheric coefficient described later.
  • the imaging lens 21 used in the following examples includes lenses having aspheric surfaces.
  • the aspheric shape of the lens is defined by the following formula (5) :
  • Z is a depth of the aspheric surface.
  • C is a paraxial curvature which is equal to 1 /R, h is a distance from the optical axis to a lens surface, K is an eccentricity (second-order aspheric coefficient) , and An is an nth-order aspheric coefficient.
  • the imaging lens 21 includes, in order from the object side toward the imaging surface S side, a first lens L1 having a positive refractive power with a convex surface facing the object side, a second lens L2 having a negative refractive power with a concave surface facing the imaging surface S side, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, and a sixth lens L6 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side.
  • the aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.
  • Table 1 shows values corresponding to the formulas (1) to (4) of the first example.
  • Table 2 shows the aspheric coefficients of the imaging lens 21.
  • Table 3 and FIG. 3 show the distortion amount before image processing-based distortion correction is performed in the first example.
  • Table 4 and FIG. 4 show parameters related to the formula (4) .
  • Image height is an image height which is normalized to 1 or the maximum image height.
  • Image height_r is an actual image height which is not normalized to 1.
  • “Distortion” is a distortion amount before image processing-based distortion correction is performed.
  • “Distortion_l” is a distortion amount on a straight line which connects a point indicating the image height of 50%of the maximum image height on a distortion curve before image processing-based distortion correction is performed, and a point indicating the maximum image height on the distortion curve.
  • “Difference” is a difference of the distortion amount before image processing-based distortion correction is performed with respect to the distortion amount on the straight line.
  • “Upper limit of difference of distortion” is an allowable upper limit of the difference of the distortion amount before image processing-based distortion correction is performed with respect to the distortion amount on the straight line.
  • “Lower limit of difference of distortion” is an allowable lower limit of the difference of the distortion amount before image processing-based distortion correction is performed with respect to the distortion amount on the straight line.
  • “Upper limits of distortion at image heights of 0.50 and 1.00” are an upper limit of the distortion amount when the image height is 50%and an upper limit of the distortion amount when the distortion is maximum.
  • “Lower limits of distortion at image heights of 0.50 and 1.00” are a lower limit of the distortion amount when the image height is 50%and a lower limit of the distortion amount when the distortion is maximum.
  • “ ⁇ ” is a slope of the straight line.
  • “Intercept” is a distortion amount on the straight line when the image height is 50%. The meanings of the terms in the Tables 3 and 4 apply to all the other examples.
  • Image height Image height_r Distortion Distortion_l Difference 0 0 0.00 0.05 0.1776 0.49 0.1 0.3552 0.62 0.15 0.5328 0.74 0.2 0.7104 0.97 0.25 0.888 1.27 0.3 1.0656 1.57 0.35 1.2432 1.84 0.4 1.4208 2.09 0.45 1.5984 2.34 0.5 1.776 2.61 2.61 0.00 0.55 1.9536 2.93 3.07 -0.13 0.6 2.1312 3.32 3.52 -0.20 0.65 2.3088 3.77 3.98 -0.21 0.7 2.4864 4.25 4.43 -0.18 0.75 2.664 4.74 4.89 -0.15 0.8 2.8416 5.23 5.34 -0.11 0.85 3.0192 5.80 5.80 0.00 0.9 3.1968 6.43 6.25 0.18 0.95 3.3744 7.02 6.71 0.31 1 3.552 7.16 7.16 0.00
  • FIG. 5 shows, as examples of aberrations, spherical aberration, astigmatism (field curvature) and distortion after image processing-based distortion correction is performed.
  • Each of these aberration diagrams shows aberrations with d-line (587.56 nm) as a reference wavelength.
  • spherical aberration diagram Aberrations with respect to g-line (435.84 nm) and C-line (656.27 nm) are also shown.
  • S indicates a value of aberration on a sagittal image surface
  • T indicates a value of aberration on a tangential image surface.
  • IMG HT indicates actual image height. The same applies to aberration diagrams in other examples.
  • the camera module 11 in the first example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size.
  • the imaging lens 21 includes, in order from the object side toward the imaging surface S side, a first lens L1 having a positive refractive power with a convex surface facing the object side, a second lens L2 having a positive refractive power with a convex surface facing the object side, a third lens L3 having a negative refractive power with a concave surface facing the imaging surface S side, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a positive refractive power, a sixth lens L6 having a negative refractive power with a concave surface facing the imaging surface S side, and a seventh lens L7 having a negative refractive power with a concave surface facing the imaging surface S side.
  • the aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.
  • Table 5 shows values corresponding to the formulas (1) to (4) of the second example.
  • Table 6 shows the aspheric coefficients of the imaging lens 21.
  • Table 7 and FIG. 7 show the distortion amount before image processing-based distortion correction is performed in the second example.
  • Table 8 and FIG. 8 show parameters related to the formula (4) .
  • Image height Image height_r Distortion Distortion_l Difference 0 0 0.00 0.05 0.252 0.04 0.1 0.504 0.16 0.15 0.756 0.39 0.2 1.008 0.70 0.25 1.26 1.01 0.3 1.512 1.28 0.35 1.764 1.53 0.4 2.016 1.84 0.45 2.268 2.23 0.5 2.52 2.68 2.68 0.00 0.55 2.772 3.15 3.08 0.07 0.6 3.024 3.63 3.49 0.14 0.65 3.276 4.08 3.89 0.19 0.7 3.528 4.50 4.30 0.20 0.75 3.78 4.90 4.70 0.19 0.8 4.032 5.29 5.11 0.19 0.85 4.284 5.69 5.51 0.18 0.9 4.536 6.05 5.92 0.13 0.95 4.788 6.36 6.32 0.04 1 5.04 6.73 6.73 0.00
  • FIG. 9 Aberrations in the second example are shown in FIG. 9. As can be seen from the aberration diagrams in FIG. 9, it is obvious that the camera module 11 in the second example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size.
  • the imaging lens 21 includes, in order from the object side toward the imaging surface S side, a first lens L1 having a positive refractive power with a convex surface facing the object side, a second lens L2 having a negative refractive power with a concave surface facing the imaging surface S side, a third lens L3 having a positive refractive power with a convex surface facing the object side, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a negative refractive power with a concave surface facing the imaging surface S side, a sixth lens L6 having a positive refractive power, and a seventh lens L7 having a negative refractive power with concave surfaces facing the object side and the imaging surface S side.
  • the aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.
  • Table 9 shows values corresponding to the formulas (1) to (4) of the third example.
  • Table 10 shows the aspheric coefficients of the imaging lens 21.
  • Table 11 and FIG. 11 show the distortion amount before image processing-based distortion correction is performed in the third example.
  • Table 12 and FIG. 12 show parameters related to the formula (4) .
  • Image height Image height_r Distortion Distortion_l Difference 0 0 0.00 0.05 0.27 0.05 0.1 0.54 0.17 0.15 0.81 0.31 0.2 1.08 0.43 0.25 1.35 0.51 0.3 1.62 0.58 0.35 1.89 0.70 0.4 2.16 0.89 0.45 2.43 1.19 0.5 2.7 1.60 1.60 0.00 0.55 2.97 2.10 2.13 -0.04 0.6 3.24 2.65 2.67 -0.02 0.65 3.51 3.20 3.21 -0.01 0.7 3.78 3.70 3.74 -0.05 0.75 4.05 4.18 4.28 -0.11 0.8 4.32 4.69 4.82 -0.13 0.85 4.59 5.27 5.35 -0.09 0.9 4.86 5.88 5.89 -0.01 0.95 5.13 6.46 6.43 0.03 1 5.4 6.96 6.96 0.00
  • FIG. 13 Aberrations in the third example are shown in FIG. 13. As can be seen from the aberration diagrams in FIG. 13, it is obvious that the camera module 11 in the third example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size.
  • the imaging lens 21 includes, in order from the object side toward the imaging surface S side, a first lens L1 having a positive refractive power with a convex surface facing the object side, a second lens L2 having a negative refractive power with a concave surface facing the imaging surface S side, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, and a fifth lens L5 having a positive refractive power with a concave surface facing the imaging surface S side.
  • the aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.
  • Table 13 shows values corresponding to the formulas (1) to (4) of the fourth example.
  • Table 14 shows the aspheric coefficients of the imaging lens 21.
  • Table 15 and FIG. 15 show the distortion amount before image processing-based distortion correction is performed in the fourth example.
  • Table 16 and FIG. 16 show parameters related to the formula (4) .
  • Image height Image height_r Distortion Distortion_l Difference 0 0 0.00 0.05 0.17 0.50 0.1 0.34 0.87 0.15 0.51 1.18 0.2 0.68 1.52 0.25 0.85 1.96 0.3 1.02 2.54 0.35 1.19 3.22 0.4 1.36 3.96 0.45 1.53 4.68 0.5 1.7 5.34 5.34 0.00 0.55 1.87 5.92 5.76 0.16 0.6 2.04 6.47 6.19 0.29 0.65 2.21 7.00 6.61 0.39 0.7 2.38 7.50 7.04 0.46 0.75 2.55 7.95 7.46 0.48 0.8 2.72 8.33 7.89 0.44 0.85 2.89 8.66 8.31 0.35 0.9 3.06 8.95 8.74 0.22 0.95 3.23 9.25 9.16 0.09 1 3.4 9.59 9.59 0.00
  • FIG. 17 Aberrations in the fourth example are shown in FIG. 17. As can be seen from the aberration diagrams in FIG. 17, it is obvious that the camera module 11 in the fourth example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size.
  • the imaging lens 21 includes, in order from the object side toward the imaging surface S side, a first lens L1 having a positive refractive power with a convex surface facing the object side, a second lens L2 having a negative refractive power with a concave surface facing the imaging surface S side, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a positive refractive power with a convex surface facing the imaging surface S side, and a sixth lens L6 having a negative refractive power with a concave surface facing the imaging surface S side.
  • the aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.
  • Table 17 shows values corresponding to the formulas (1) to (4) of the fifth example.
  • Table 18 shows the aspheric coefficients of the imaging lens 21.
  • Table 19 and FIG. 19 show the distortion amount before image processing-based distortion correction is performed in the fifth example.
  • Table 20 and FIG. 20 show parameters related to the formula (4) .
  • Image height Image height_r Distortion Distortion_l Difference 0 0 0.00 0.05 0.17 0.48 0.1 0.34 0.61 0.15 0.51 0.71 0.2 0.68 0.91 0.25 0.85 1.19 0.3 1.02 1.48 0.35 1.19 1.74 0.4 1.36 1.97 0.45 1.53 2.20 0.5 1.7 2.44 2.44 0.00 0.55 1.87 2.71 2.89 -0.17 0.6 2.04 3.04 3.33 -0.30 0.65 2.21 3.43 3.78 -0.35 0.7 2.38 3.86 4.23 -0.37 0.75 2.55 4.32 4.68 -0.36 0.8 2.72 4.77 5.12 -0.36 0.85 2.89 5.24 5.57 -0.33 0.9 3.06 5.78 6.02 -0.23 0.95 3.23 6.39 6.46 -0.08 1 3.4 6.91 6.91 0.00
  • FIG. 21 Aberrations in the fifth example are shown in FIG. 21. As can be seen from the aberration diagrams in FIG. 21, it is obvious that the camera module 11 in the fifth example can satisfactorily correct various aberrations to obtain superior optical performance despite being small in size.
  • Table 21 and FIG. 22 show the distortion amount before image processing-based distortion correction is performed in the comparative example.
  • Table 22 and FIG. 23 show parameters related to the formula (4) .
  • Image height Image height_r Distortion Distortion_l Difference 0 0 0.00 0.05 0.1776 1.58 0.1 0.3552 2.30 0.15 0.5328 2.70 0.2 0.7104 3.15 0.25 0.888 3.68 0.3 1.0656 4.23 0.35 1.2432 4.74 0.4 1.4208 5.24 0.45 1.5984 5.72 0.5 1.776 6.20 6.20 0.00 0.55 1.9536 6.66 6.54 0.12 0.6 2.1312 7.08 6.87 0.21 0.65 2.3088 7.46 7.21 0.25 0.7 2.486399999 7.78 7.54 0.24 0.75 2.663999999 8.04 7.87 0.17 0.8 2.841599999 8.30 8.21 0.09 0.85 3.019199999 8.60 8.54 0.06 0.9 3.196799999 8.88 8.88 0.00 0.95 3.374399999 8.82 9.21 -0.39 1 3.551999999 8.00 9.55 -1.55
  • first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features.
  • a feature defined as “first” and “second” may comprise one or more of this feature.
  • a plurality of means “two or more than two” , unless otherwise specified.
  • the terms “mounted” , “connected” , “coupled” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements which can be understood by those skilled in the art according to specific situations.
  • a structure in which a first feature is "on" or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are in contact via an additional feature formed therebetween.
  • a first feature "on” , “above” or “on top of” a second feature may include an embodiment in which the first feature is orthogonally or obliquely “on” , “above” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature “below” , “under” or “on bottom of” a second feature may include an embodiment in which the first feature is orthogonally or obliquely “below” , "under” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature.
  • Any process or method described in a flow chart or described herein in other ways may be understood to include one or more modules, segments or portions of codes of executable instructions for achieving specific logical functions or steps in the process, and the scope of a preferred embodiment of the present disclosure includes other implementations, in which it should be understood by those skilled in the art that functions may be implemented in a sequence other than the sequences shown or discussed, including in a substantially identical sequence or in an opposite sequence.
  • the logic and/or step described in other manners herein or shown in the flow chart may be specifically achieved in any computer readable medium to be used by the instructions execution system, device or equipment (such as a system based on computers, a system comprising processors or other systems capable of obtaining instructions from the instructions execution system, device and equipment executing the instructions) , or to be used in combination with the instructions execution system, device and equipment.
  • the computer readable medium may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment.
  • the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (amagnetic device) , a randomaccess memory (RAM) , a read only memory (ROM) , an erasable programmable read-only memory (EPROM or a flash memory) , an optical fiber device and a portable compact disk read-only memory (CDROM) .
  • the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
  • each part of the present disclosure may be realized by the hardware, software, firmware or their combination.
  • a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instructions execution system.
  • the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA) , a field programmable gate array (FPGA) , etc.
  • each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module.
  • the integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may be stored in a computer readable storage medium.
  • the storage medium mentioned above may be read-only memories, magnetic disks, CD, etc.

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

Abstract

Lentille d'imagerie (21) comprenant au moins une lentille ayant une réfringence positive et au moins une lentille ayant une réfringence négative, la lentille d'imagerie (21) satisfaisant les expressions conditionnelles suivantes, (ΣD/Ymax) × (Fno + 1,8) ≤ 5,4 ; 0,75 ≤ (Ya-0,5)/(Dist_A-Dist _B) ≤ 1,25, avec ΣD étant une longueur totale de la lentille d'imagerie (21), Ymax étant une hauteur d'image maximale, Fno étant un nombre F, Ya étant une hauteur d'image lorsqu'une quantité de distorsion est maximale avant que la correction de distorsion basée sur un traitement d'image ne soit réalisée, la hauteur d'image étant normalisée à la hauteur d'image maximale, Dist_A étant une quantité de distorsion maximale avant la correction de distorsion basée sur le traitement d'image et Dist_B étant une quantité de distorsion lorsque la hauteur d'image est de 50 % de la hauteur d'image maximale.
PCT/CN2020/089259 2020-05-08 2020-05-08 Lentille d'imagerie prenant en considération une correction de distorsion basée sur un traitement d'image, module de dispositif de prise de vues et dispositif d'imagerie WO2021223238A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
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JP2010079311A (ja) * 2009-12-21 2010-04-08 Hoya Corp 広角ズームレンズ系
CN202285058U (zh) * 2011-08-30 2012-06-27 一品光学工业股份有限公司 光学取像镜头
CN105807397A (zh) * 2015-01-20 2016-07-27 三星电子株式会社 成像透镜和包括该成像透镜的成像装置
CN105929523A (zh) * 2016-06-08 2016-09-07 广东旭业光电科技股份有限公司 一种超薄广角高像素摄影镜头组件
CN106526798A (zh) * 2016-11-16 2017-03-22 江西联益光学有限公司 手机外置镜头
KR20170058601A (ko) * 2015-11-19 2017-05-29 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010079311A (ja) * 2009-12-21 2010-04-08 Hoya Corp 広角ズームレンズ系
CN202285058U (zh) * 2011-08-30 2012-06-27 一品光学工业股份有限公司 光学取像镜头
CN105807397A (zh) * 2015-01-20 2016-07-27 三星电子株式会社 成像透镜和包括该成像透镜的成像装置
KR20170058601A (ko) * 2015-11-19 2017-05-29 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
CN105929523A (zh) * 2016-06-08 2016-09-07 广东旭业光电科技股份有限公司 一种超薄广角高像素摄影镜头组件
CN106526798A (zh) * 2016-11-16 2017-03-22 江西联益光学有限公司 手机外置镜头

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