WO2020001119A1 - Objectif - Google Patents

Objectif Download PDF

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Publication number
WO2020001119A1
WO2020001119A1 PCT/CN2019/081364 CN2019081364W WO2020001119A1 WO 2020001119 A1 WO2020001119 A1 WO 2020001119A1 CN 2019081364 W CN2019081364 W CN 2019081364W WO 2020001119 A1 WO2020001119 A1 WO 2020001119A1
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Prior art keywords
lens
imaging
object side
imaging lens
image side
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PCT/CN2019/081364
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English (en)
Chinese (zh)
Inventor
高雪
李明
闻人建科
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浙江舜宇光学有限公司
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Publication of WO2020001119A1 publication Critical patent/WO2020001119A1/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 imaging lens, and more particularly, the present application relates to an imaging lens including eight lenses.
  • CMOS complementary metal-oxide semiconductor
  • the aperture number (F-number) of the existing lens is usually configured to be 2.0 or more, so as to achieve good optical performance while reducing the size of the lens.
  • the camera lens can have a large aperture performance on the basis of ultra-thin and miniaturized, in order to achieve background blur and can be used in especially low light (such as rainy days, dusk, etc.) High-quality images can still be taken under hand shake, etc. For this reason, F-numbers of 2.0 or above can no longer meet higher-level imaging requirements.
  • the present application provides a camera lens that is applicable to portable electronic products and can at least solve or partially solve at least one of the above disadvantages in the prior art.
  • the present application provides such a camera lens, which 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, a fifth lens, and a first lens.
  • Six lenses, seventh lens, and eighth lens are included in a camera lens, which 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, a fifth lens, and a first lens.
  • the total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens may satisfy f / EPD ⁇ 1.9.
  • the second lens may have positive power, and the total effective focal length f of the imaging lens and the effective focal length f2 of the second lens may satisfy 0 ⁇ f2 / f ⁇ 2.
  • the total effective focal length f of the imaging lens and the effective focal length f3 of the third lens may satisfy 1 ⁇
  • the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens may satisfy 0 ⁇ R2 / R1 ⁇ 2.
  • the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens may satisfy 1 ⁇
  • the maximum effective radius DT21 of the object side of the second lens and the maximum effective radius DT41 of the object side of the fourth lens may satisfy 1 ⁇ DT21 / DT41 ⁇ 1.5.
  • the fourth lens may have a positive power, and the total effective focal length f of the imaging lens and the effective focal length f4 of the fourth lens may satisfy 0 ⁇ f / f4 ⁇ 0.5.
  • the seventh lens may have positive power, and the image side thereof may be convex.
  • the eighth lens may have a negative optical power, and its image side may be concave.
  • the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis may satisfy 0 ⁇ (CT1 + CT3) /CT2 ⁇ 1.5.
  • the sum of the air interval ⁇ AT on the optical axis of any two adjacent lenses of the first lens to the eighth lens and the air interval T78 of the seventh lens and the eighth lens on the optical axis may satisfy 3.5 ⁇ ⁇ AT / T78 ⁇ 5.5.
  • the air interval T45 on the optical axis of the fourth lens and the fifth lens and the air interval T56 on the optical axis of the fifth lens and the sixth lens may satisfy 1 ⁇ T45 / T56 ⁇ 3.
  • the total effective focal length f of the camera lens, the maximum half field angle HFOV of the camera lens, and the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the camera lens may satisfy 0 ⁇ f ⁇ TAN (HFOV) / TTL ⁇ 1.
  • This application uses eight lenses. By reasonably distributing the power, surface shape, center thickness of each lens, and the axial distance between each lens, the above-mentioned camera lens has a large aperture, ultra-thin, and high resolution. At least one beneficial effect such as good image quality and miniaturization.
  • FIG. 1 shows a schematic structural diagram of an imaging lens according to Embodiment 1 of the present application
  • FIGS. 2A to 2D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 1;
  • FIG. 3 shows a schematic structural diagram of an imaging lens according to Embodiment 2 of the present application
  • FIGS. 4A to 4D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 2;
  • FIG. 5 shows a schematic structural diagram of an imaging lens according to Embodiment 3 of the present application
  • FIGS. 6A to 6D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 3;
  • FIG. 7 shows a schematic structural diagram of an imaging lens according to Embodiment 4 of the present application
  • FIGS. 8A to 8D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 4;
  • FIG. 9 shows a schematic structural diagram of an imaging lens according to Embodiment 5 of the present application
  • FIGS. 10A to 10D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 5;
  • FIG. 11 shows a schematic structural diagram of an imaging lens according to Embodiment 6 of the present application
  • FIGS. 12A to 12D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 6;
  • FIG. 13 shows a schematic structural diagram of an imaging lens according to Embodiment 7 of the present application
  • FIGS. 14A to 14D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 7;
  • FIG. 15 shows a schematic structural diagram of an imaging lens according to Embodiment 8 of the present application
  • FIGS. 16A to 16D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 8;
  • FIG. 17 shows a schematic structural diagram of an imaging lens according to Embodiment 9 of the present application
  • FIGS. 18A to 18D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 9;
  • FIG. 19 shows a schematic structural diagram of an imaging lens according to Embodiment 10 of the present application
  • FIGS. 20A to 20D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 10.
  • first, second, third, etc. are only used to distinguish one feature from another feature, and do not indicate any limitation on the feature. Therefore, without departing from the teachings of this application, a 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.
  • the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings.
  • the drawings are only examples and are not drawn to scale.
  • the paraxial region refers to a 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 area; 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 area Concave.
  • the surface of each lens near the object side is called the object side of the lens, and the surface of each lens near the image side is called the image side of the lens.
  • the imaging lens according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, Lens and eighth lens. These eight lenses are arranged in order from the object side to the image side along the optical axis, and there can be an air gap between each adjacent lens.
  • the first lens has positive power or negative power, and the object side may be concave and the image side may be convex; the second lens may have positive power; the third lens may have positive power or Negative power; fourth lens has positive or negative power; fifth lens has positive or negative power; sixth lens has positive or negative power; seventh lens has positive power Degree or negative power; the eighth lens has positive or negative power.
  • the object-side surface of the second lens may be a convex surface.
  • the third lens may have a negative optical power, an object side thereof may be convex, and an image side may be concave.
  • the fourth lens may have a positive optical power, an object-side surface thereof may be a convex surface, and an image-side surface may be a concave surface.
  • the object side of the first lens may be concave, and the image side may be convex; the seventh lens may have positive power and its image side may be convex; the eighth lens may have negative power, which The image side may be concave. Further controlling the shape and power of the first lens, the seventh lens, and the eighth lens can effectively balance the image quality of each field of view of the optical system, improve the sensitivity of the optical system, and help ensure the stability of the assembly of the system. Mass production.
  • the imaging lens of the present application can satisfy the conditional expression f / EPD ⁇ 1.9, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens. More specifically, f and EPD can further satisfy f / EPD ⁇ 1.6, such as 1.41 ⁇ f / EPD ⁇ 1.49. Satisfying the conditional f / EPD ⁇ 1.9, which can make the optical system have the advantage of a large aperture, which can enhance the imaging effect of the system in a weak light environment; at the same time, it can also reduce the aberration of the edge field of view, which can obtain better Optical modulation transfer function (MTF) performance, which can improve overall imaging quality.
  • MTF Optical modulation transfer function
  • the imaging lens of the present application can satisfy the conditional expression 0 ⁇ f2 / f ⁇ 2, where f is a total effective focal length of the imaging lens, and f2 is an effective focal length of the second lens. More specifically, f2 and f can further satisfy 0.5 ⁇ f2 / f ⁇ 1.2, for example, 0.86 ⁇ f2 / f ⁇ 1.01.
  • the effective focal length of the second lens is set reasonably so that it meets the positive power, which is conducive to adjusting the position of the light and at the same time shortening the total optical length of the camera lens.
  • the imaging lens of the present application can satisfy the conditional expression 1 ⁇
  • the imaging lens of the present application can satisfy a conditional expression 0 ⁇ R2 / R1 ⁇ 2, where R1 is a curvature radius of the object side of the first lens and R2 is a curvature radius of the image side of the first lens. More specifically, R2 and R1 can further satisfy 0.9 ⁇ R2 / R1 ⁇ 1.2, such as 1.02 ⁇ R2 / R1 ⁇ 1.06. Reasonably setting the curvature radius of the object side and the image side of the first lens can make the optical system have a larger aperture, thereby improving the overall brightness of the imaging.
  • the imaging lens of the present application can satisfy the conditional expression 1 ⁇
  • the rational distribution of the curvature radius of the object side and the image side of the third lens can effectively control the light trend of the external field of view, so that the optical system can better match the main light angle of the chip.
  • the imaging lens of the present application can satisfy the conditional expression 0 ⁇ (CT1 + CT3) / CT2 ⁇ 1.5, where CT1 is the center thickness of the first lens on the optical axis and CT2 is the second lens on the light The central thickness on the axis, CT3 is the central thickness of the third lens on the optical axis. More specifically, CT1, CT3, and CT2 can further satisfy 0.5 ⁇ (CT1 + CT3) /CT2 ⁇ 0.9, for example, 0.69 ⁇ (CT1 + CT3) /CT2 ⁇ 0.74.
  • the rational distribution of the center thicknesses of the first lens, the second lens, and the third lens on the optical axis can effectively reduce the size of the optical system and prevent the volume of the camera lens from being too large; at the same time, it can also reduce the difficulty of lens assembly and achieve Higher space utilization.
  • the imaging lens of the present application can satisfy the conditional expression 3.5 ⁇ AT / T78 ⁇ 5.5, where ⁇ AT is the air interval on the optical axis of any two adjacent lenses among the first lens to the eighth lens.
  • T78 is the air interval of the seventh lens and the eighth lens on the optical axis.
  • ⁇ AT and T78 can further satisfy 4.06 ⁇ ⁇ AT / T78 ⁇ 5.21. It satisfies the conditional expression 3.5 ⁇ AT / T78 ⁇ 5.5, which can effectively ensure the miniaturization of the lens.
  • the deflection of light can be eased, the sensitivity of the lens can be reduced, and the astigmatism, distortion and chromatic aberration of the system can be reduced.
  • the imaging lens of the present application can satisfy the conditional expression 1 ⁇ T45 / T56 ⁇ 3, where T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T56 is the fifth lens and the first lens. Air interval of six lenses on the optical axis. More specifically, T45 and T56 can further satisfy 1.2 ⁇ T45 / T56 ⁇ 2.2, such as 1.46 ⁇ T45 / T56 ⁇ 2.06. Reasonably controlling the air interval on the optical axis of the three lenses, the fourth lens, the fifth lens, and the sixth lens, can ensure a good processing gap between the optical elements, and can ensure a better optical path deflection in the system.
  • the camera lens of the present application can satisfy the conditional expression 0 ⁇ f ⁇ TAN (HFOV) / TTL ⁇ 1, where f is the total effective focal length of the camera lens and HFOV is the maximum half field angle of the camera lens.
  • TTL is the distance from the object side of the first lens to the imaging plane on the optical axis.
  • f, HFOV, and TTL can further satisfy 0.3 ⁇ f ⁇ TAN (HFOV) /TTL ⁇ 0.7, such as 0.49 ⁇ f ⁇ TAN (HFOV) /TTL ⁇ 0.50.
  • Reasonable distribution of the effective focal length, maximum field angle, and total optical length of the optical system can effectively reduce the system size to ensure the lens has compact size characteristics.
  • the imaging lens of the present application can satisfy the conditional expression 1 ⁇ DT21 / DT41 ⁇ 1.5, where DT21 is the maximum effective radius of the object side of the second lens, and DT41 is the maximum effective radius of the object side of the fourth lens. radius. More specifically, DT21 and DT41 can further satisfy 1 ⁇ DT21 / DT41 ⁇ 1.3, such as 1.16 ⁇ DT21 / DT41 ⁇ 1.21. Reasonably controlling the ratio of the maximum effective radius of the object side of the second lens to the maximum effective radius of the object side of the fourth lens can effectively slow down the bending power of the light at the front end of the optical system, reduce the sensitivity of the optical system, and correct the optical system. Dispersion.
  • the imaging lens of the present application can satisfy a conditional expression of 0 ⁇ f / f4 ⁇ 0.5, where f is a total effective focal length of the imaging lens and f4 is an effective focal length of the fourth lens. More specifically, f and f4 can further satisfy 0.09 ⁇ f / f4 ⁇ 0.29.
  • Reasonably controlling the ratio of the total effective focal length of the camera lens to the effective focal length of the fourth lens can control the contribution of the spherical aberration of the fourth lens to a reasonable level, so that the on-axis field of view can obtain good imaging quality.
  • the above-mentioned imaging lens may further include at least one diaphragm to improve the imaging quality of the lens.
  • the diaphragm may be disposed between the first lens and the second lens.
  • the above-mentioned imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element on the imaging surface.
  • the imaging lens according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above.
  • the size of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved.
  • the camera lens configured as above can also have beneficial effects such as large aperture, ultra-thin, high resolution, good imaging quality, and miniaturization.
  • aspheric mirror surfaces are often used for each lens.
  • Aspheric lenses are characterized by a curvature that varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the lens center to the periphery of the lens, an aspheric lens has better curvature radius characteristics, and has the advantages of improving distortion and astigmatic aberration.
  • the use of aspheric lenses can eliminate as much aberrations as possible during imaging, thereby improving imaging quality.
  • the number of lenses constituting the imaging lens may be changed to obtain various results and advantages described in this specification.
  • the imaging lens is not limited to including eight lenses. If necessary, the camera lens may include other numbers of lenses. Specific examples of the imaging lens applicable to the above embodiments will be further described below with reference to the drawings.
  • FIG. 1 is a schematic structural diagram of an imaging lens according to Embodiment 1 of the present application.
  • an imaging lens includes: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens in order from the object side to the image side along the optical axis.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a concave surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 1.
  • the units of the radius of curvature and thickness are millimeters (mm).
  • each aspheric lens can be defined using, but not limited to, the following aspheric formula:
  • x is the distance vector from the vertex of the aspheric surface when the aspheric surface is at the height h along the optical axis;
  • k is the conic coefficient (given in Table 1);
  • Ai is the correction coefficient of the aspherical i-th order.
  • Table 2 below shows the higher-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 S3-S16 in Example 1. .
  • Table 3 shows the half of the effective pixel area diagonal length ImgH on the imaging surface S19 of the imaging lens in Example 1 and the total optical length TTL (ie, from the object side S1 to the imaging surface S19 of the first lens E1 on the optical axis Distance), maximum half field angle HFOV, aperture number Fno, total effective focal length f, and effective focal lengths f1 to f8 of each lens.
  • FIG. 2A shows an on-axis chromatic aberration curve of the imaging lens of Example 1, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 2B shows an astigmatism curve of the imaging lens of Example 1, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 2C shows a distortion curve of the imaging lens of Example 1, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 2D shows the magnification chromatic aberration curve of the imaging lens of Example 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens.
  • the imaging lens provided in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 is a schematic structural diagram of an imaging lens according to Embodiment 2 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a convex surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 4 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the imaging lens of Example 2.
  • the units of the radius of curvature and thickness are millimeters (mm).
  • Table 5 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 2, where each aspheric surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 6 shows the half of the diagonal length of the effective pixel area ImgH on the imaging surface S19 of the imaging lens in Example 2, the total optical length TTL, the maximum half field of view angle HFOV, the aperture number Fno, the total effective focal length f, and the Effective focal lengths f1 to f8.
  • FIG. 4A shows an on-axis chromatic aberration curve of the imaging lens of Example 2, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 4B shows the astigmatism curve of the imaging lens of Example 2, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 4C shows a distortion curve of the imaging lens of Example 2, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 4D shows a magnification chromatic aberration curve of the imaging lens of Example 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens.
  • the imaging lens provided in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 is a schematic structural diagram of an imaging lens according to Embodiment 3 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a concave surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a concave surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 3.
  • the units of the radius of curvature and thickness are millimeters (mm).
  • Table 8 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 3, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 9 shows the half of the diagonal length of the effective pixel area ImgH on the imaging surface S19 of the imaging lens in Example 3, the total optical length TTL, the maximum half field of view angle HFOV, the aperture number Fno, the total effective focal length f, and Effective focal lengths f1 to f8.
  • FIG. 6A illustrates an on-axis chromatic aberration curve of the imaging lens of Example 3, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 6B shows the astigmatism curve of the imaging lens of Example 3, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 6C shows a distortion curve of the imaging lens of Example 3, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 6D shows the magnification chromatic aberration curve of the imaging lens of Example 3, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.
  • the imaging lens provided in Embodiment 3 can achieve good imaging quality.
  • FIG. 7 is a schematic structural diagram of an imaging lens according to Embodiment 4 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a convex surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a concave surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a concave surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 4, where the units of the radius of curvature and thickness are millimeters (mm).
  • Table 11 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 4, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 12 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 4, ImgH, the total optical length TTL, the maximum half field of view angle HFOV, the aperture number Fno, the total effective focal length f, and the length of each lens. Effective focal lengths f1 to f8.
  • FIG. 8A shows an on-axis chromatic aberration curve of the imaging lens of Example 4, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 8B shows the astigmatism curve of the imaging lens of Example 4, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 8C shows a distortion curve of the imaging lens of Example 4, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 8D shows a magnification chromatic aberration curve of the imaging lens of Example 4, which represents deviations of different image heights on the imaging plane after light passes through the lens. 8A to 8D, it can be known that the imaging lens provided in Embodiment 4 can achieve good imaging quality.
  • FIG. 9 is a schematic structural diagram of an imaging lens according to Embodiment 5 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth The lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9 and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a concave surface
  • the image side surface S10 is a convex surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a concave surface and the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a concave surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 5, where the units of the radius of curvature and thickness are millimeters (mm).
  • Table 14 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 5, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 15 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 5, ImgH, the total optical length TTL, the maximum half field angle HFOV, the aperture number Fno, the total effective focal length f, and Effective focal lengths f1 to f8.
  • FIG. 10A shows an on-axis chromatic aberration curve of the imaging lens of Example 5, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 10B shows the astigmatism curve of the imaging lens of Example 5, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 10C illustrates a distortion curve of the imaging lens of Example 5, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 10D shows a magnification chromatic aberration curve of the imaging lens of Example 5, which represents deviations of different image heights on the imaging plane after light passes through the lens. It can be seen from FIGS. 10A to 10D that the imaging lens provided in Embodiment 5 can achieve good imaging quality.
  • FIG. 11 is a schematic structural diagram of an imaging lens according to Embodiment 6 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a negative power, and an object side surface S1 thereof is a concave surface, and an image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a convex surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a concave surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 6, where the units of the radius of curvature and thickness are both millimeters (mm).
  • Table 17 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 6, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 18 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 6, ImgH, the total optical length TTL, the maximum half field of view angle HFOV, the aperture number Fno, the total effective focal length f, and the length of each lens. Effective focal lengths f1 to f8.
  • FIG. 12A shows an on-axis chromatic aberration curve of the imaging lens of Example 6, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 12B shows the astigmatism curve of the imaging lens of Example 6, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 12C shows a distortion curve of the imaging lens of Example 6, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 12D shows a magnification chromatic aberration curve of the imaging lens of Example 6, which represents deviations of different image heights on the imaging plane after light passes through the lens.
  • the imaging lens provided in Embodiment 6 can achieve good imaging quality.
  • FIG. 13 is a schematic structural diagram of an imaging lens according to Embodiment 7 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a positive power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a convex surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 7, where the units of the radius of curvature and thickness are millimeters (mm).
  • Table 20 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 7, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 21 shows half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 7, ImgH, the total optical length TTL, the maximum half field of view angle HFOV, the aperture number Fno, the total effective focal length f, and Effective focal lengths f1 to f8.
  • FIG. 14A shows an on-axis chromatic aberration curve of the imaging lens of Example 7, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 14B shows the astigmatism curve of the imaging lens of Example 7, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 14C illustrates a distortion curve of the imaging lens of Example 7, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 14D shows the magnification chromatic aberration curve of the imaging lens of Example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.
  • the imaging lens provided in Embodiment 7 can achieve good imaging quality.
  • FIG. 15 is a schematic structural diagram of an imaging lens according to Embodiment 8 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a negative power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a concave surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a convex surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 8, where the units of the radius of curvature and thickness are both millimeters (mm).
  • Table 23 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 8, where each aspheric surface type can be defined by the formula (1) given in the above-mentioned Embodiment 1.
  • Table 24 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 8, ImgH, the total optical length TTL, the maximum half field angle HFOV, the aperture number Fno, the total effective focal length f, and Effective focal lengths f1 to f8.
  • FIG. 16A shows an on-axis chromatic aberration curve of the imaging lens of Example 8, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 16B shows the astigmatism curve of the imaging lens of Example 8, which shows a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 16C shows a distortion curve of the imaging lens of Example 8, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 16D shows a magnification chromatic aberration curve of the imaging lens of Example 8, which represents deviations of different image heights on the imaging plane after light passes through the lens.
  • the imaging lens provided in Embodiment 8 can achieve good imaging quality.
  • FIG. 17 is a schematic structural diagram of an imaging lens according to Embodiment 9 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth The lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a convex surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a concave surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a positive power
  • its object side surface S13 is convex
  • its image side surface S14 is convex.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a convex surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 25 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 9, where the units of the radius of curvature and thickness are millimeters (mm).
  • Table 26 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 9, where each aspheric surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 27 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 9, ImgH, the total optical length TTL, the maximum half field of view angle HFOV, the aperture number Fno, the total effective focal length f, and the Effective focal lengths f1 to f8.
  • FIG. 18A illustrates an on-axis chromatic aberration curve of the imaging lens of Example 9, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 18B shows an astigmatism curve of the imaging lens of Example 9, which shows a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 18C shows a distortion curve of the imaging lens of Example 9, which represents the magnitude of the distortion corresponding to different image heights.
  • FIG. 18D shows a magnification chromatic aberration curve of the imaging lens of Example 9, which represents deviations of different image heights on the imaging plane after light passes through the lens.
  • the imaging lens provided in Embodiment 9 can achieve good imaging quality.
  • FIG. 19 is a schematic structural diagram of an imaging lens according to Embodiment 10 of the present application.
  • the imaging lens includes, in order from the object side to the image side along the optical axis, a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, and a fourth lens.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface.
  • the second lens E2 has a positive power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface.
  • the third lens E3 has a negative power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a negative power
  • the object side surface S11 is a concave surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a positive power
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the eighth lens E8 has a negative power
  • the object side surface S15 is a concave surface
  • the image side surface S16 is a concave surface.
  • the filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.
  • Table 28 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 10, where the units of the radius of curvature and thickness are both millimeters (mm).
  • Table 29 shows the high-order term coefficients that can be used for each aspherical mirror surface in Embodiment 10, where each aspheric surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 30 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 of the imaging lens S19 in Example 10, ImgH, the total optical length TTL, the maximum half field angle HFOV, the aperture number Fno, the total effective focal length f, and Effective focal lengths f1 to f8.
  • FIG. 20A shows an on-axis chromatic aberration curve of the imaging lens of Example 10, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 20B shows an astigmatism curve of the imaging lens of Example 10, which shows a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 20C shows a distortion curve of the imaging lens of Example 10, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 20D shows a magnification chromatic aberration curve of the imaging lens of Example 10, which represents the deviation of different image heights on the imaging plane after light passes through the lens.
  • 20A to 20D it can be known that the imaging lens provided in Embodiment 10 can achieve good imaging quality.
  • Examples 1 to 10 satisfy the relationships shown in Table 31, 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 device 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 imaging lens described above.

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Abstract

La présente invention porte sur un objectif comprenant, d'un côté objet à un côté image le long d'un axe optique, des première à huitième lentilles en séquence. Les première à huitième lentilles ont une puissance focale positive ou négative. La deuxième lentille a une puissance focale positive. Une surface côté objet de la première lentille est une surface concave, et une surface côté image est une surface convexe. Un intervalle d'air est formé entre deux lentilles adjacentes des première à huitième lentilles. La distance focale réelle totale f de l'objectif et le diamètre de pupille d'entrée (EPD) de l'objectif satisfont à f/EPD ≤ 1.9.
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CN108663782B (zh) * 2018-08-13 2023-06-06 浙江舜宇光学有限公司 摄像镜头
CN109407256B (zh) * 2018-12-27 2024-01-23 博众精工科技股份有限公司 用于内孔检测的镜头系统
US11226473B2 (en) * 2018-12-28 2022-01-18 Samsung Electro-Mechanics Co., Ltd. Optical imaging system including eight lenses of +++−+−+−, −++−+++− or +−+−++−− refractive powers
KR20200131010A (ko) * 2019-05-13 2020-11-23 삼성전기주식회사 촬상 광학계
JP7352400B2 (ja) * 2019-07-18 2023-09-28 東京晨美光学電子株式会社 撮像レンズ
CN110609376B (zh) * 2019-09-27 2024-04-19 浙江舜宇光学有限公司 光学成像镜头
KR102418603B1 (ko) 2019-11-25 2022-07-07 삼성전기주식회사 촬상 광학계
TWI714368B (zh) 2019-11-27 2020-12-21 大立光電股份有限公司 攝像用光學系統、取像裝置及電子裝置
CN111025588B (zh) * 2019-12-28 2021-08-20 诚瑞光学(常州)股份有限公司 摄像光学镜头
WO2021128395A1 (fr) * 2019-12-28 2021-07-01 诚瑞光学(常州)股份有限公司 Lentille optique de caméra
TWI725714B (zh) 2020-01-20 2021-04-21 大立光電股份有限公司 攝影用光學透鏡組、取像裝置及電子裝置
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