WO2020134026A1 - Système d'imagerie optique - Google Patents

Système d'imagerie optique Download PDF

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Publication number
WO2020134026A1
WO2020134026A1 PCT/CN2019/095606 CN2019095606W WO2020134026A1 WO 2020134026 A1 WO2020134026 A1 WO 2020134026A1 CN 2019095606 W CN2019095606 W CN 2019095606W WO 2020134026 A1 WO2020134026 A1 WO 2020134026A1
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Prior art keywords
lens
imaging system
optical imaging
object side
optical
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PCT/CN2019/095606
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English (en)
Chinese (zh)
Inventor
黄林
戴付建
赵烈烽
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浙江舜宇光学有限公司
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Publication of WO2020134026A1 publication Critical patent/WO2020134026A1/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
    • 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 relates to an optical imaging system, and more particularly, to an optical imaging system including five lenses.
  • the optical imaging system applied to it faces the challenges of high pixels, low cost, and ultrathinness.
  • the five-piece lens system is still an important choice.
  • the major smart terminal manufacturers are increasingly pursuing high-resolution and thin and light lenses, and the large working image area and the total length of short systems have become the main factors of concern for major smart terminal manufacturers.
  • the large working image surface means that higher image resolution may be provided, and the short overall system length means that the lens can be thinner and lighter.
  • the present application provides an optical imaging system applicable to portable electronic products, which can at least solve or partially solve the above-mentioned at least one disadvantage in the prior art.
  • the present application provides an optical imaging system that includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.
  • the first lens can have positive power and its object side can be convex; the second lens can have negative power; the third lens can have negative power and its image side can be concave; the fourth lens has positive light Power or negative power; the fifth lens may have negative power, and its object side may be concave.
  • the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system can satisfy TTL/f ⁇ 1.
  • the distance TTL on the optical axis between the object side of the first lens and the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system may satisfy TTL/f ⁇ 0.95.
  • the total effective focal length f of the optical imaging system and half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system, ImgH, can satisfy f/ImgH>4.5.
  • the curvature radius R9 of the object side of the fifth lens and the effective focal length f5 of the fifth lens may satisfy 0 ⁇ R9/f5 ⁇ 1.
  • the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy 0 ⁇ f2/f3 ⁇ 1.
  • the radius of curvature R1 of the object side of the first lens and the radius of curvature R6 of the image side of the third lens may satisfy 0 ⁇ R1/R6 ⁇ 1.4.
  • the center thickness of the first lens on the optical axis CT1, the center thickness of the second lens on the optical axis CT2, and the effective focal length f1 of the first lens can satisfy 0 ⁇ (CT1+CT2)/f1 ⁇ 0.7 .
  • the dispersion coefficient V2 of the second lens, the dispersion coefficient V3 of the third lens, and the dispersion coefficient V4 of the fourth lens may satisfy 30 ⁇ (V2+V3+V4)/3 ⁇ 40.
  • the separation distance T12 between the first lens and the second lens on the optical axis and the separation distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy 0 ⁇ T12*T45 ⁇ 0.2 mm 2 .
  • the center thickness of the third lens on the optical axis CT3, the center thickness of the fourth lens on the optical axis CT4 and the center thickness of the fifth lens on the optical axis CT5 can satisfy 0 ⁇ CT5/(CT3+ CT4) ⁇ 0.5.
  • the sum of the distance TTL on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system and the separation distance on the optical axis of any two adjacent lenses from the first lens to the fifth lens ⁇ AT can satisfy 4 ⁇ TTL/ ⁇ AT ⁇ 5.
  • the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT51 of the object side of the fifth lens may satisfy 1 ⁇ DT11/DT51 ⁇ 2.
  • the maximum effective radius DT21 of the object side of the second lens, the maximum effective radius DT41 of the object side of the fourth lens, and the half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, ImgH can satisfy 1 ⁇ (DT21+DT41)/ImgH ⁇ 1.5.
  • This application uses five lenses.
  • the above optical imaging system has ultra-thin and high resolution , At least one beneficial effect such as low cost.
  • FIGS. 2A to 2D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 1 respectively. curve;
  • FIG. 3 shows a schematic structural diagram of an optical imaging system according to Example 2 of the present application
  • FIGS. 4A to 4D respectively show an on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration of the optical imaging system of Example 2. curve;
  • FIG. 5 shows a schematic structural diagram of an optical imaging system according to Example 3 of the present application
  • FIGS. 6A to 6D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 3, respectively. curve;
  • FIGS. 8A to 8D respectively show an on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration of the optical imaging system of Example 4. curve;
  • FIGS. 10A to 10D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 5 respectively. curve;
  • FIGS. 12A to 12D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 6 respectively. curve;
  • FIG. 13 shows a schematic structural diagram of an optical imaging system according to Example 7 of the present application
  • FIGS. 14A to 14D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Example 7 respectively. curve.
  • first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teaching of this application, the first lens discussed below may also be referred to as a second lens or a third lens.
  • the thickness, size, and shape of the lens have been slightly exaggerated for ease of explanation.
  • the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings.
  • the drawings are only examples and are not strictly drawn to scale.
  • the paraxial region refers to the region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is at least in the paraxial region. Concave surface. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.
  • the optical imaging system may include, for example, five lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.
  • the five lenses are arranged in order along the optical axis from the object side to the image side.
  • any adjacent two lenses may have an air gap.
  • the first lens may have positive power and its object side may be convex; the second lens may have negative power; the third lens may have negative power and its image side may be concave; The fourth lens has positive power or negative power; the fifth lens may have negative power, and the object side surface may be concave.
  • Reasonable distribution of the effective focal length of the first lens to the fifth lens can reduce the deflection angle of the light, reduce the sensitivity of the tolerance of each lens, and improve the imaging quality of the optical system.
  • the optical imaging system may satisfy the conditional expression TTL/f ⁇ 1, where TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis, and f is The total effective focal length of the optical imaging system. More specifically, TTL and f can further satisfy 0.88 ⁇ TTL/f ⁇ 0.95. Effectively compress the size of the system, ensure the compact size of the lens, and increase the size of the image surface reasonably, and ensure better imaging quality when taking into account the ultra-thin and large image surface.
  • the optical imaging system may satisfy the conditional expression f/ImgH>4.5, where f is the total effective focal length of the optical imaging system, and ImgH is the diagonal of the effective pixel area on the imaging surface of the optical imaging system Half the length of the line. More specifically, f and ImgH can further satisfy 4.90 ⁇ f/ImgH ⁇ 5.36. Satisfying the conditional formula f/ImgH>4.5 is conducive to achieving the characteristics of telephoto and super-large working image surface.
  • the optical imaging system may satisfy the conditional expression 0 ⁇ R9/f5 ⁇ 1, where f5 is the effective focal length of the fifth lens and R9 is the radius of curvature of the object side of the fifth lens. More specifically, f5 and R9 can further satisfy 0.25 ⁇ R9/f5 ⁇ 0.63.
  • the deflection angle of the edge field of view at the fifth lens can be controlled, which can effectively reduce the sensitivity of the system and at the same time make the image of the fifth lens The inclination angle at the side edge is reduced, eliminating the risk of ghosts here.
  • the optical imaging system according to the present application may satisfy the conditional expression 0 ⁇ f2/f3 ⁇ 1, where f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens. More specifically, f2 and f3 may further satisfy 0.06 ⁇ f2/f3 ⁇ 0.80. Reasonable distribution of the power of the second lens and the third lens can balance the aberration of the system, so that the optical system has a good balance ability.
  • the optical imaging system according to the present application may satisfy the conditional expression 0 ⁇ R1/R6 ⁇ 1.4, where R1 is the radius of curvature of the object side of the first lens and R6 is the curvature of the image side of the third lens radius. More specifically, R1 and R6 can further satisfy 0.04 ⁇ R1/R6 ⁇ 1.10. Reasonable setting of the ratio of the radius of curvature of the first lens and the third lens can reduce the deflection angle of the light, make it easier to balance the aberration of the system, and improve the imaging quality of the system.
  • the optical imaging system may satisfy the conditional expression 0 ⁇ (CT1+CT2)/f1 ⁇ 0.7, where f1 is the effective focal length of the first lens and CT1 is the first lens on the optical axis
  • the center thickness of CT2 is the center thickness of the second lens on the optical axis.
  • f1, CT1, and CT2 may further satisfy 0.2 ⁇ (CT1+CT2)/f1 ⁇ 0.6, for example, 0.34 ⁇ (CT1+CT2)/f1 ⁇ 0.48.
  • the first and second lenses can be used while ensuring a reasonable structure of the first and second lenses To correct the field curvature and astigmatism of the system.
  • the optical imaging system may satisfy the conditional expression 0 ⁇ T12*T45 ⁇ 0.2 mm 2 , where T12 is the separation distance between the first lens and the second lens on the optical axis, and T45 is the first The separation distance between the four lens and the fifth lens on the optical axis. More specifically, T12 and T45 can further satisfy 0.04 mm 2 ⁇ T12*T45 ⁇ 0.15 mm 2 . By controlling this relationship, the optical system has a better ability to balance the dispersion, and the purpose of controlling the effective focal length is achieved by adjusting the optical path of the air interval.
  • the optical imaging system may satisfy the conditional expression 0 ⁇ CT5/(CT3+CT4) ⁇ 0.5, where CT3 is the center thickness of the third lens on the optical axis and CT4 is the fourth lens
  • the center thickness on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis.
  • CT3, CT4, and CT5 may further satisfy 0.2 ⁇ CT5/(CT3+CT4) ⁇ 0.5, for example, 0.22 ⁇ CT5/(CT3+CT4) ⁇ 0.39.
  • Reasonable distribution of the center thickness of the third lens, the fourth lens, and the fifth lens can ensure the good workability and at the same time enable the optical system to have a better ability to balance aberrations.
  • the optical imaging system according to the present application may satisfy the conditional expression 4 ⁇ TTL/ ⁇ AT ⁇ 5, where TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis , ⁇ AT is the sum of the separation distances of any two adjacent lenses on the optical axis from the first lens to the fifth lens. More specifically, TTL and ⁇ AT can further satisfy 4.18 ⁇ TTL/ ⁇ AT ⁇ 4.83.
  • Reasonable control of the air distance between the lens on the axis and the axis distance from the side of the first lens object to the imaging surface can ensure that the total length of the optical imaging lens is within an appropriate range, and at the same time it is beneficial to adjust the structure of the optical imaging lens and reduce lens processing and assembly Difficulty.
  • the optical imaging system according to the present application may satisfy the conditional expression 1 ⁇ DT11/DT51 ⁇ 2, where DT11 is the maximum effective radius of the object side of the first lens and DT51 is the object side of the fifth lens Maximum effective radius. More specifically, DT11 and DT51 can further satisfy 1.1 ⁇ DT11/DT51 ⁇ 1.6, for example, 1.26 ⁇ DT11/DT51 ⁇ 1.48. Reasonable control of the maximum effective radius of the first lens and the fifth lens can reduce the volume of the lens head, achieve the effect of a small head, and help to increase the screen ratio of the mobile phone.
  • the optical imaging system may satisfy the conditional expression 1 ⁇ (DT21+DT41)/ImgH ⁇ 1.5, where DT21 is the maximum effective radius of the object side of the second lens and DT41 is the fourth lens
  • the maximum effective radius of the side of the object, ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system.
  • DT21, DT41 and ImgH can further satisfy 1.21 ⁇ (DT21+DT41)/ImgH ⁇ 1.32.
  • Reasonable control of the maximum effective radius of the second lens and the fourth lens can reduce the lens volume while ensuring the characteristics of the large image surface of the optical system.
  • the above-mentioned optical imaging system may further include a diaphragm.
  • the diaphragm may be provided between the object side and the first lens, for example.
  • the diaphragm can be disposed at any position between the object side and the image side as needed.
  • the above optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.
  • the optical imaging system may employ multiple lenses, such as the five described above.
  • multiple lenses such as the five described above.
  • the volume of the imaging system can be effectively reduced, the sensitivity of the imaging system can be reduced, and the imaging system can be improved.
  • the processability makes the optical imaging system more conducive to production and processing and applicable to portable electronic products.
  • the optical imaging system with the above configuration can also have beneficial effects such as ultra-thin, large image surface, high resolution, low cost, and high imaging quality, which can better meet the needs of most mobile phone lenses.
  • At least one of the mirror surfaces of each lens is an aspheric mirror surface, that is, the object side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens
  • At least one of the sum image side is an aspheric mirror surface.
  • the characteristics of aspheric lenses are: from the lens center to the lens periphery, the curvature is continuously changing. Unlike spherical lenses that have a constant curvature from the center of the lens to the periphery of the lens, aspheric lenses have better curvature radius characteristics, and have the advantages of improving distortion aberrations and improving astigmatic aberrations.
  • the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are aspherical mirror surfaces.
  • the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification without departing from the technical solution claimed in this application.
  • the optical imaging system is not limited to include five lenses. If desired, the optical imaging system may also include other numbers of lenses.
  • FIG. 1 shows a schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a third The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex.
  • the second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave.
  • the third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave.
  • the fourth lens E4 has positive power, its object side S7 is convex, and the image side S8 is flat at the paraxial axis.
  • the fifth lens E5 has negative power, its object side S9 is concave, and the image side S10 is flat at the paraxial axis.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 1, wherein the units of radius of curvature and thickness are both millimeters (mm).
  • Example 1 the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical, and the surface type x of each aspherical lens can be defined by, but not limited to, the following aspherical formula :
  • x is the distance from the apex of the aspheric surface to the height of the aspheric surface at the 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 2 below shows the high-order coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 that can be used for each aspherical mirror surface S1-S10 in Example 1. .
  • Table 3 shows the ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S13 in Example 1, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • FIGS. 2A to 2D show an on-axis chromatic aberration curve of the optical imaging system of Example 1, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 2B shows the astigmatism curve of the optical imaging system of Example 1, which represents meridional image plane curvature and sagittal image plane curvature.
  • FIG. 2C shows the distortion curve of the optical imaging system of Example 1, which represents the distortion magnitude value under different fields of view.
  • FIG. 2D shows the magnification chromatic aberration curve of the optical imaging system of Example 1, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 2A to 2D that the optical imaging system provided in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 shows a schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a third The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex.
  • the second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave.
  • the third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave.
  • the fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface.
  • the fifth lens E5 has negative power, its object side S9 is concave, and the image side S10 is flat at the paraxial axis.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 2, wherein the units of radius of curvature and thickness are both millimeters (mm).
  • Example 2 the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical.
  • Table 5 shows the higher-order coefficients that can be used for each aspherical mirror surface in Example 2, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.
  • Table 6 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging plane S13 in Example 2, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging plane S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • FIG. 4A shows the on-axis chromatic aberration curve of the optical imaging system of Example 2, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 4B shows the astigmatism curve of the optical imaging system of Example 2, which represents meridional image plane curvature and sagittal image plane curvature.
  • FIG. 4C shows the distortion curve of the optical imaging system of Example 2, which represents the distortion magnitude value under different fields of view.
  • 4D shows the magnification chromatic aberration curve of the optical imaging system of Example 2, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 4A to 4D that the optical imaging system provided in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 shows a schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex.
  • the second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave.
  • the third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave.
  • the fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface.
  • the fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 3, where the units of radius of curvature and thickness are both millimeters (mm).
  • Example 3 the object side and the image side of any of the first lens E1 to the fifth lens E5 are aspherical.
  • Table 8 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.
  • Table 9 shows the ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S13 in Example 3, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • FIG. 6A shows an on-axis chromatic aberration curve of the optical imaging system of Example 3, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 6B shows the astigmatism curve of the optical imaging system of Example 3, which represents meridional image plane curvature and sagittal image plane curvature.
  • FIG. 6C shows the distortion curve of the optical imaging system of Example 3, which represents the distortion magnitude value under different fields of view.
  • 6D shows the magnification chromatic aberration curve of the optical imaging system of Example 3, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 6A to 6D that the optical imaging system provided in Embodiment 3 can achieve good imaging quality.
  • FIGS. 7 to 8D shows a schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application.
  • the optical imaging system includes, in order from the object side to the image side, along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a third The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex.
  • the second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is concave.
  • the third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave.
  • the fourth lens E4 has negative refractive power, and its object side surface S7 is concave and the image side surface S8 is convex.
  • the fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 4, wherein the units of radius of curvature and thickness are both millimeters (mm).
  • Example 4 the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical.
  • Table 11 shows the coefficients of higher order that can be used for each aspherical mirror surface in Example 4, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.
  • Table 12 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging surface S13 in Example 4, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • FIG. 8A shows the on-axis chromatic aberration curve of the optical imaging system of Example 4, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 8B shows the astigmatism curve of the optical imaging system of Example 4, which represents meridional image plane curvature and sagittal image plane curvature.
  • FIG. 8C shows the distortion curve of the optical imaging system of Example 4, which represents the distortion magnitude value under different fields of view.
  • 8D shows the magnification chromatic aberration curve of the optical imaging system of Example 4, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be known from FIGS. 8A to 8D that the optical imaging system provided in Embodiment 4 can achieve good imaging quality.
  • FIGS. 9 to 10D shows a schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, its object side S1 is convex, and its image side S2 is concave.
  • the second lens E2 has negative refractive power, and its object side surface S3 is convex, and its image side surface S4 is concave.
  • the third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave.
  • the fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface.
  • the fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 5, wherein the units of radius of curvature and thickness are both millimeters (mm).
  • Example 5 the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical.
  • Table 14 shows the coefficients of higher order that can be used for each aspherical mirror surface in Example 5, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.
  • Table 15 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging surface S13 in Example 5, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • FIG. 10A shows an on-axis chromatic aberration curve of the optical imaging system of Example 5, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 10B shows the astigmatism curve of the optical imaging system of Example 5, which represents meridional image plane curvature and sagittal image plane curvature.
  • FIG. 10C shows the distortion curve of the optical imaging system of Example 5, which represents the distortion magnitude value under different fields of view.
  • 10D shows the magnification chromatic aberration curve of the optical imaging system of Example 5, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens.
  • the optical imaging system provided in Embodiment 5 can achieve good imaging quality.
  • FIGS. 11 to 12D shows a schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex.
  • the second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is convex.
  • the third lens E3 has negative refractive power, and its object side surface S5 is convex, and its image side surface S6 is concave.
  • the fourth lens E4 has positive refractive power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface.
  • the fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 6, wherein the units of radius of curvature and thickness are both millimeters (mm).
  • Example 6 the object side and the image side of any of the first lens E1 to the fifth lens E5 are aspherical.
  • Table 17 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 6, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.
  • Table 18 shows the half-diagonal length of the effective pixel area on the imaging plane S13 in Example 6, ImgH, the distance from the object side S1 of the first lens E1 to the imaging plane S13 on the optical axis, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • FIG. 12A shows an on-axis chromatic aberration curve of the optical imaging system of Example 6, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 12B shows the astigmatism curve of the optical imaging system of Example 6, which represents meridional image plane curvature and sagittal image plane curvature.
  • FIG. 12C shows the distortion curve of the optical imaging system of Example 6, which represents the distortion magnitude value under different fields of view.
  • 12D shows the magnification chromatic aberration curve of the optical imaging system of Example 6, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 12A to 12D that the optical imaging system provided in Embodiment 6 can achieve good imaging quality.
  • FIGS. 13 to 14D shows a schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a The four lens E4, the fifth lens E5, the filter E6, and the imaging surface S13.
  • the first lens E1 has positive refractive power, and its object side S1 is convex, and its image side S2 is convex.
  • the second lens E2 has negative refractive power, and its object side surface S3 is concave and the image side surface S4 is convex.
  • the third lens E3 has negative refractive power, and its object side surface S5 is concave and the image side surface S6 is concave.
  • the fourth lens E4 has negative refractive power, and its object side surface S7 is concave and the image side surface S8 is convex.
  • the fifth lens E5 has negative refractive power, and its object side surface S9 is concave and the image side surface S10 is concave.
  • the filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the surfaces S1 to S12 and is finally imaged on the imaging plane S13.
  • Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of Example 7, wherein the units of radius of curvature and thickness are both millimeters (mm).
  • Example 7 the object side and the image side of any one of the first lens E1 to the fifth lens E5 are aspherical.
  • Table 20 shows the coefficients of higher order that can be used for each aspherical mirror surface in Example 7, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.
  • Table 21 shows the ImgH, which is half the diagonal of the effective pixel area on the imaging surface S13 in Example 7, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13, and the maximum half angle of view HFOV , The aperture value Fno, the total effective focal length f of the optical imaging system, and the effective focal lengths f1 to f5 of the lenses.
  • 14A shows an on-axis chromatic aberration curve of the optical imaging system of Example 7, which indicates that rays of different wavelengths will deviate from the focal point after passing through the lens.
  • 14B shows the astigmatism curve of the optical imaging system of Example 7, which represents meridional image plane curvature and sagittal image plane curvature.
  • Fig. 14C shows the distortion curve of the optical imaging system of Example 7, which represents the distortion magnitude value under different fields of view.
  • 14D shows the magnification chromatic aberration curve of the optical imaging system of Example 7, which represents the deviation of different image heights on the imaging plane of light rays passing through the lens. It can be seen from FIGS. 14A to 14D that the optical imaging system provided in Example 7 can achieve good imaging quality.
  • Examples 1 to 7 satisfy the relationships shown in Table 22, respectively.
  • the present application also provides an imaging device whose electronic photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).
  • the imaging apparatus may be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone.
  • the imaging device is equipped with the optical imaging system described above.

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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 comprenant, séquentiellement d'un côté objet à un côté image le long d'un axe optique, une première lentille (E1), une deuxième lentille (E2), une troisième lentille (E3), une quatrième lentille (E4) et une cinquième lentille (E5). La première lentille (E1) a une puissance focale positive et une surface côté objet convexe (S1) ; la deuxième lentille (E2) a une puissance focale négative ; la troisième lentille (E3) a une puissance focale négative et une surface côté objet concave (S6) ; la quatrième lentille (E4) a une puissance focale positive ou négative ; la cinquième lentille (E5) a une puissance focale négative et une surface côté objet concave (S9). Une distance TTL sur un axe optique depuis la surface côté objet (S1) de la première lentille (E1) vers une surface d'imagerie (S13) du système d'imagerie optique, une longueur totale effective f du système d'imagerie optique et la moitié d'une longueur diagonale, ImgH, d'une région de pixel efficace sur la surface d'imagerie (S13) du système d'imagerie optique satisfont à TTL/f ≤ 0,95 et f/ImgH < 4,5.
PCT/CN2019/095606 2018-12-26 2019-07-11 Système d'imagerie optique WO2020134026A1 (fr)

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