WO2020042799A1 - Ensemble de lentilles imageuses optiques - Google Patents

Ensemble de lentilles imageuses optiques Download PDF

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Publication number
WO2020042799A1
WO2020042799A1 PCT/CN2019/096318 CN2019096318W WO2020042799A1 WO 2020042799 A1 WO2020042799 A1 WO 2020042799A1 CN 2019096318 W CN2019096318 W CN 2019096318W WO 2020042799 A1 WO2020042799 A1 WO 2020042799A1
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Prior art keywords
lens
optical imaging
lens group
image side
object side
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PCT/CN2019/096318
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English (en)
Chinese (zh)
Inventor
杨健
计云兵
周鑫
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浙江舜宇光学有限公司
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Publication of WO2020042799A1 publication Critical patent/WO2020042799A1/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 lens group, and more particularly, to an optical imaging lens group including eight lenses.
  • the present application provides an optical imaging lens group, such as a telephoto lens, which 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.
  • an optical imaging lens group such as a telephoto lens
  • the present application provides such an optical imaging lens group.
  • the lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a first lens having optical power.
  • the first lens may have positive power and its object side may be convex; the fifth lens may have negative power and its image side may be concave; the object side of the sixth lens may be concave; the object side of the seventh lens may be Is convex; the eighth lens may have positive power.
  • the air interval T34 on the optical axis of the third lens and the fourth lens and the air interval T45 on the optical axis of the fourth lens and the fifth lens satisfy 0.5 ⁇ (T12 + T23 + T34 + T45) / CT1 * 5 ⁇ 1.5.
  • the effective focal length f1 of the first lens and the effective focal length f2 of the second lens may satisfy 2.5 ⁇ f2 / f1 ⁇ 5.
  • the curvature radius R2 of the image side of the first lens and the effective focal length f5 of the fifth lens may satisfy -4 ⁇ R2 / f5 ⁇ -3.
  • the curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens may satisfy 2 ⁇ R13 / R14 ⁇ 3.
  • the total effective focal length f of the optical imaging lens group and the curvature radius R10 of the image side of the fifth lens may satisfy 1.8 ⁇ f / R10 ⁇ 2.5.
  • an air interval T67 on the optical axis of the sixth lens and the seventh lens and an air interval T12 on the optical axis of the first lens and the second lens may satisfy 1.5 ⁇ T67 / T12 / 10 ⁇ 2.5.
  • the maximum effective half-aperture DT52 of the image side of the fifth lens and the maximum effective half-aperture DT82 of the image side of the eighth lens may satisfy 2 ⁇ DT82 / DT52 ⁇ 3.
  • the maximum half field angle HFOV of the optical imaging lens group can satisfy HFOV ⁇ 30 °.
  • the combined focal length f78 of the seventh lens and the eighth lens and the combined focal length f12345 of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may satisfy -3.5 ⁇ f78 / f12345 ⁇ -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 optical imaging lens group has a large aperture, a long focal length, At least one beneficial effect, such as high image quality and miniaturization.
  • FIG. 1 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 1 of the present application
  • FIGS. 2A to 2D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 1; Magnification chromatic aberration curve;
  • FIG. 3 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 2 of the present application
  • FIGS. 4A to 4D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 2; Magnification chromatic aberration curve;
  • FIG. 5 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 3 of the present application
  • FIGS. 6A to 6D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 3; Magnification chromatic aberration curve;
  • FIG. 7 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 4 of the present application
  • FIGS. 8A to 8D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 4; Magnification chromatic aberration curve;
  • FIG. 9 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 5 of the present application
  • FIGS. 10A to 10D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 5; Magnification chromatic aberration curve;
  • FIG. 11 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 6 of the present application
  • FIGS. 12A to 12D show axial chromatic aberration curves, astigmatism curves, distortion curves, and Magnification chromatic aberration curve;
  • FIG. 13 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 7 of the present application
  • FIGS. 14A to 14D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 7; Magnification chromatic aberration curve;
  • FIG. 15 shows a schematic structural diagram of an optical imaging lens group according to Embodiment 8 of the present application
  • FIGS. 16A to 16D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and distortion curves of the optical imaging lens group of Embodiment 8; Magnification chromatic aberration curve.
  • 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 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.
  • the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.
  • optical imaging lens group In order to achieve clearer imaging when shooting at long distances, a longer focal length optical imaging lens group must be used, and in order to meet the needs of commercial miniaturization and low cost, the total length of the optical imaging lens group must be controlled.
  • Aspheric surfaces can significantly improve image quality, reduce aberrations, and help reduce the number of lenses to achieve miniaturization of lens groups. Therefore, the use of aspheric lenses is an important means to alleviate the contradiction between the telephoto lens and the total optical length of the lens group.
  • Existing optical imaging lens groups have an all-glass structure, an all-plastic structure, and a glass-plastic mixed structure. With the advent of precision processing, aspheric processing and industrialized production become possible. Precision processing technology includes not only the direct grinding of aspherical surface processing of glass materials, but also the aspherical surface processing of die-casting glass materials and the aspherical surface processing of plastic materials. Compared with glass materials, plastic materials are cheaper, easier to process, and easier to commercialize.
  • the optical imaging lens group 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, The seventh lens and the eighth lens. These eight lenses are arranged in order from the object side to the image side along the optical axis, and each adjacent lens can have an air gap.
  • the first lens may have a positive power and its object side may be convex; the second lens has a positive power or a negative power; the third lens has a positive power or a negative power;
  • the four lenses have positive or negative power; the fifth lens can have negative power and its image side can be concave; the sixth lens has positive or negative power and its object side can be concave;
  • the seventh lens may have positive or negative power, and the object side may be convex; and the eighth lens may have positive power.
  • the image side of the first lens may be concave.
  • the second lens may have a positive power, and an object-side surface thereof may be a convex surface.
  • the image side of the sixth lens may be convex.
  • the seventh lens may have a negative power and its image side may be concave.
  • the object side of the eighth lens may be concave.
  • the optical imaging lens group of the present application can satisfy a conditional expression HFOV ⁇ 30 °, where HFOV is a maximum half field angle of the optical imaging lens group. More specifically, HFOV can further satisfy HFOV ⁇ 25 °, for example, 22 ° ⁇ HFOV ⁇ 23 °.
  • HFOV can further satisfy HFOV ⁇ 25 °, for example, 22 ° ⁇ HFOV ⁇ 23 °.
  • the optical imaging lens group of the present application can satisfy the conditional expression 0.5 ⁇ (T12 + T23 + T34 + T45) / CT1 * 5 ⁇ 1.5, where CT1 is the center thickness of the first lens on the optical axis , T12 is the air interval on the optical axis of the first and second lenses, T23 is the air interval on the optical axis of the second and third lenses, and T34 is the air on the optical axis of the third and fourth lenses Interval, T45 is the air interval on the optical axis of the fourth lens and the fifth lens.
  • T12, T23, T34, T45, and CT1 can further satisfy 0.74 ⁇ (T12 + T23 + T34 + T45) /CT1*5 ⁇ 1.33.
  • conditional expression 0.5 ⁇ (T12 + T23 + T34 + T45) / CT1 * 5 ⁇ 1.5 it is helpful to balance the total optical length and processing difficulty of the optical imaging lens group.
  • the value of (T12 + T23 + T34 + T45) / CT1 * 5 is too large, the total optical length of the lens group will be too long; when the value of (T12 + T23 + T34 + T45) / CT1 * 5 is too small, it will make The processing difficulty of the lens group increases, which is not conducive to assembly.
  • the optical imaging lens group of the present application may satisfy a conditional expression 2.5 ⁇ f2 / f1 ⁇ 5, where f1 is an effective focal length of the first lens and f2 is an effective focal length of the second lens. More specifically, f1 and f2 can further satisfy 2.98 ⁇ f2 / f1 ⁇ 4.47.
  • the first lens bears a larger optical power
  • the second lens bears a smaller optical power, which helps to improve chromatic aberration, reduce the total optical length of the lens group, and increase the back focal length.
  • the optical imaging lens group of the present application can satisfy the conditional expression -4 ⁇ R2 / f5 ⁇ -3, where R2 is the curvature radius of the image side of the first lens, and f5 is the effective focal length of the fifth lens. . More specifically, R2 and f5 can further satisfy -3.73 ⁇ R2 / f5 ⁇ -3.01. Satisfying the conditional expression -4 ⁇ R2 / f5 ⁇ -3 is beneficial to improve the field curvature and distortion of the lens group, and reasonably control the processing difficulty of the fifth lens.
  • the optical imaging lens group of the present application may satisfy a conditional expression -3.5 ⁇ f78 / f12345 ⁇ -1, where f78 is a combined focal length of the seventh lens and an eighth lens, and f12345 is a first lens, a The combined focal length of the two lenses, the third lens, the fourth lens, and the fifth lens. More specifically, f78 and f12345 can further satisfy -3.17 ⁇ f78 / f12345 ⁇ -1.38. The first five lenses share the main optical power, and the seventh lens and the eighth lens cooperate to improve the chromatic aberration of the lens group and improve the sharpness of the picture.
  • the optical imaging lens group of the present application can satisfy the conditional expression 2 ⁇ R13 / R14 ⁇ 3, where R13 is the curvature radius of the object side of the seventh lens, and R14 is the curvature of the image side of the seventh lens. radius. More specifically, R13 and R14 can further satisfy 2.12 ⁇ R13 / R14 ⁇ 2.99. Satisfying the conditional expression 2 ⁇ R13 / R14 ⁇ 3, can prevent the seventh lens from being excessively bent, which is helpful to reduce the difficulty of processing, and is also conducive to rationally controlling the field curvature of the lens.
  • the optical imaging lens group of the present application can satisfy the conditional expression 1.8 ⁇ f / R10 ⁇ 2.5, where f is the total effective focal length of the optical imaging lens group, and R10 is the radius of curvature of the image side of the fifth lens. . More specifically, f and R10 can further satisfy 1.94 ⁇ f / R10 ⁇ 2.46. Reasonably controlling the range of the ratio of f and R10 is conducive to adjusting the angle of the main light, which is also beneficial to match the chip's CRA.
  • the optical imaging lens group of the present application can satisfy the conditional expression 1.5 ⁇ T67 / T12 / 10 ⁇ 2.5, where T67 is the air interval between the sixth lens and the seventh lens on the optical axis, and T12 is the first The air space of one lens and the second lens on the optical axis. More specifically, T67 and T12 can further satisfy 1.90 ⁇ T67 / T12 / 10 ⁇ 2.35.
  • T67 to T12 is too large, it is not conducive to the assembly of the lens group; when the ratio of T67 to T12 is too small, the total optical length of the lens group is too long, which is not conducive to miniaturization.
  • Reasonably controlling the ratio of T67 to T12 is beneficial to balance the assembly difficulty and total optical length of the lens group.
  • the optical imaging lens group of the present application can satisfy the conditional expression 2 ⁇ DT82 / DT52 ⁇ 3, where DT52 is the maximum effective half-diameter of the image side of the fifth lens and DT82 is the image side of the eighth lens Maximum effective half-caliber. More specifically, DT82 and DT52 can further satisfy 2.18 ⁇ DT82 / DT52 ⁇ 2.73.
  • the ratio of DT82 to DT52 is too large, it is not conducive to the assembly of the lens group; when the ratio of DT82 to DT52 is too small, it is not conducive to the correction of off-axis aberrations, and high image quality cannot be achieved.
  • Reasonably controlling the ratio of DT82 to DT52 helps to balance the assembly difficulty and imaging quality of the lens group.
  • the above-mentioned optical imaging lens group may further include a diaphragm to improve the imaging quality of the lens.
  • the diaphragm can be set at any position between the object side and the image side as needed.
  • the above-mentioned optical imaging lens group may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element on the imaging surface.
  • the optical imaging lens group 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 optical imaging lens set is more conducive to production and processing and is applicable to portable electronic products.
  • the optical imaging lens group configured as described above can also have beneficial effects such as long focal length, large aperture, and high imaging quality.
  • At least one of the mirror surfaces of each lens is an aspherical mirror surface.
  • Aspheric lenses are characterized by a curvature that varies continuously from the center of the lens to the periphery of the lens. Unlike spherical lenses with a constant curvature from the lens center to the periphery of the lens, aspheric lenses have better curvature radius characteristics, and have the advantages of improving distortion and astigmatic aberrations. The use of aspheric lenses can eliminate as much aberrations as possible during imaging, thereby improving imaging quality.
  • the number of lenses constituting the optical imaging lens group may be changed to obtain various results and advantages described in this specification.
  • the optical imaging lens group is not limited to including eight lenses. If necessary, the optical imaging lens group may further include other numbers of lenses. Specific examples of the optical imaging lens group applicable to the above embodiments will be further described below with reference to the drawings.
  • FIG. 1 is a schematic structural diagram of an optical imaging lens group according to Embodiment 1 of the present application.
  • an optical imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 in order from the object side to the image side along the optical axis. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 positive power, and the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface.
  • the fourth lens E4 has a negative 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 concave surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive 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 1 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the optical imaging lens group 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, and A 16 that can be used for each of the aspherical mirrors S1-S16 in Example 1.
  • Table 3 shows the half of the diagonal length of the effective pixel region ImgH on the imaging surface S19 in Example 1, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19, and the maximum half field angle HFOV The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 2A shows an on-axis chromatic aberration curve of the optical imaging lens group 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 optical imaging lens group of Example 1, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 2C shows a distortion curve of the optical imaging lens group of Example 1, which represents the magnitude of the distortion corresponding to different image heights.
  • FIG. 2D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 1, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to FIG. 2A to FIG. 2D, it can be known that the optical imaging lens group provided in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 is a schematic structural diagram of an optical imaging lens group according to Embodiment 2 of the present application.
  • the optical imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 in order from the object side to the image side along the optical axis. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 positive 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 concave surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive 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 optical imaging lens group 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 half of the diagonal length of the effective pixel area ImgH on the imaging surface S19, the distance from the object side S1 of the first lens E1 to the imaging surface S19 on the optical axis TTL, and the maximum half field angle HFOV in Example 2.
  • FIG. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of Example 2, which indicates that the light beams with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 4B shows an astigmatism curve of the optical imaging lens group of Example 2, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 4C shows a distortion curve of the optical imaging lens group of Example 2, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 4D shows a magnification chromatic aberration curve of the optical imaging lens group of Example 2, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. It can be known from FIG. 4A to FIG. 4D that the optical imaging lens group provided in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 is a schematic structural diagram of an optical imaging lens group according to Embodiment 3 of the present application.
  • the optical imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 in order from the object side to the image side along the optical axis. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.
  • the second lens E2 has a positive power, and its object side surface S3 is convex and its image side surface S4 is concave.
  • the third lens E3 has a positive power, and the object side surface S5 is a convex surface, and the image side surface S6 is a convex 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 concave 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 negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive power
  • the object side surface S15 is a convex surface
  • the image side surface S16 is a convex 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, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the optical imaging lens group 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 aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.
  • Table 9 shows the half of the effective pixel region diagonal length ImgH on the imaging surface S19 in Example 3, the distance TTL on the optical axis from the object side S1 to the imaging surface S19 of the first lens E1, and the maximum half field angle HFOV The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 6A shows an on-axis chromatic aberration curve of the optical imaging lens group of Example 3, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 6B shows an astigmatism curve of the optical imaging lens group of Example 3, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 6C illustrates a distortion curve of the optical imaging lens group of Example 3, which represents the magnitude of distortion corresponding to different image heights.
  • FIG. 6D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 3, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to FIG. 6A to FIG. 6D, it can be known that the optical imaging lens group provided in Embodiment 3 can achieve good imaging quality.
  • FIG. 7 is a schematic structural diagram of an optical imaging lens group according to Embodiment 4 of the present application.
  • the optical imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 in order from the object side to the image side along the optical axis. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 positive power, and the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.
  • the fourth lens E4 has a positive power, and the object side surface S7 is a concave surface, and the image side surface S8 is a convex 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 concave surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive 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 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens group of Example 4, where the units of the radius of curvature and thickness are millimeters (mm).
  • Table 11 shows the high-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 the above Embodiment 1.
  • Table 12 shows the half of the diagonal length of the effective pixel area on the imaging surface S19 in Example 4, ImgH, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S19, and the maximum half field angle HFOV The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 4, which indicates that the light beams with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 8B shows the astigmatism curve of the optical imaging lens group of Example 4, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 8C shows a distortion curve of the optical imaging lens group of Example 4, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 8D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 4, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. According to FIG. 8A to FIG. 8D, it can be known that the optical imaging lens group provided in Embodiment 4 can achieve good imaging quality.
  • FIG. 9 is a schematic structural diagram of an optical imaging lens group according to Embodiment 5 of the present application.
  • the optical imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 in order from the object side to the image side along the optical axis. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 concave surface, and the image side surface S6 is a convex surface.
  • the fourth lens E4 has a negative 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 concave 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 negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive power
  • the object side surface S15 is a convex surface
  • the image side surface S16 is a convex 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 optical imaging lens group 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 the above Embodiment 1.
  • Table 15 shows half of the effective pixel area diagonal length ImgH on the imaging surface S19, the distance TTL on the optical axis from the object side S1 to the imaging surface S19 of the first lens E1, and the maximum half field angle HFOV in Example 5. The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 10A shows an on-axis chromatic aberration curve of the optical imaging lens group of Example 5, which shows that the focal points of light with different wavelengths deviate after passing through the lens.
  • FIG. 10B shows an astigmatism curve of the optical imaging lens group of Example 5, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 10C shows a distortion curve of the optical imaging lens group of Example 5, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 10D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 5, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to FIG. 10A to FIG. 10D, it can be known that the optical imaging lens group provided in Embodiment 5 can achieve good imaging quality.
  • FIG. 11 is a schematic structural diagram of an optical imaging lens group according to Embodiment 6 of the present application.
  • the optical imaging lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 positive power, and the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.
  • the fourth lens E4 has a negative 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 positive 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 negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive 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 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens group of Example 6, where the units of the radius of curvature and thickness are 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 the above Embodiment 1.
  • Table 18 shows the half of the diagonal length of the effective pixel area ImgH on the imaging surface S19 in Example 6, the distance TTL on the optical axis from the object side S1 to the imaging surface S19 of the first lens E1, and the maximum half field angle HFOV The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 12A shows an on-axis chromatic aberration curve of the optical imaging lens group of Example 6, which indicates that light rays with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 12B shows an astigmatism curve of the optical imaging lens group of Example 6, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 12C shows a distortion curve of the optical imaging lens group of Example 6, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 12D shows a magnification chromatic aberration curve of the optical imaging lens group of Example 6, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to FIG. 12A to FIG. 12D, it can be known that the optical imaging lens group provided in Embodiment 6 can achieve good imaging quality.
  • FIG. 13 is a schematic structural diagram of an optical imaging lens group according to Embodiment 7 of the application.
  • the optical imaging lens group includes: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4 in order from the object side to the image side along the optical axis. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 positive power, and the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.
  • the fourth lens E4 has a negative 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 concave 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 concave surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a negative power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive 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 optical imaging lens group 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 effective pixel region diagonal length ImgH on the imaging surface S19, the distance TTL on the optical axis from the object side S1 to the imaging surface S19 of the first lens E1, and the maximum half field angle HFOV in Example 7. The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 14A illustrates an on-axis chromatic aberration curve of the optical imaging lens group of Example 7, which indicates that the light beams with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 14B shows an astigmatism curve of the optical imaging lens group of Example 7, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 14C shows a distortion curve of the optical imaging lens group of Example 7, which represents the magnitude of the distortion corresponding to different image heights.
  • FIG. 14D shows a magnification chromatic aberration curve of the optical imaging lens group of Example 7, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.
  • the optical imaging lens group provided in Embodiment 7 can achieve good imaging quality.
  • FIG. 15 is a schematic structural diagram of an optical imaging lens group according to Embodiment 8 of the present application.
  • the optical imaging lens group includes, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. , A fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.
  • the first lens E1 has a positive power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave 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 positive 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 concave 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 negative power
  • its object side surface S13 is a convex surface
  • its image side surface S14 is a concave surface.
  • the eighth lens E8 has a positive 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 optical imaging lens group of Example 8, where the units of the radius of curvature and thickness are 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 Embodiment 1.
  • Table 24 shows half of the effective pixel region diagonal length ImgH on the imaging surface S19, the distance TTL on the optical axis from the object side S1 to the imaging surface S19 of the first lens E1, and the maximum half field angle HFOV in Example 8. The total effective focal length f of the optical imaging lens group and the effective focal lengths f1 to f8 of each lens.
  • FIG. 16A shows an on-axis chromatic aberration curve of the optical imaging lens group of Embodiment 8, which indicates that the light beams with different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 16B shows the astigmatism curve of the optical imaging lens group of Example 8, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 16C shows a distortion curve of the optical imaging lens group of Example 8, which represents the magnitude of the distortion corresponding to different image heights.
  • FIG. 16D shows the magnification chromatic aberration curve of the optical imaging lens group of Example 8, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to FIG. 16A to FIG. 16D, it can be known that the optical imaging lens group provided in Embodiment 8 can achieve good imaging quality.
  • Examples 1 to 8 satisfy the relationships shown in Table 25, 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 optical imaging lens group described above.

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

L'invention concerne un ensemble de lentilles imageuses optiques comprenant, depuis un côté objet vers 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), une cinquième lentille (E5), une sixième lentille (E6), une septième lentille (E7) et une huitième lentille (E8), qui ont toutes une puissance focale. La première lentille (E1) a une puissance focale positive, et sa face côté objet (S1) est convexe ; la cinquième lentille (E5) a une puissance focale négative, et sa face côté objet (S10) est concave ; une face côté objet (S11) de la sixième lentille (E6) est concave ; une face côté objet (S13) de la septième lentille (E7) est convexe ; la huitième lentille (E8) a une puissance optique positive ; et il existe un entrefer entre deux lentilles adjacentes quelconques entre la première lentille (E1) et la huitième lentille (E8).
PCT/CN2019/096318 2018-08-30 2019-07-17 Ensemble de lentilles imageuses optiques WO2020042799A1 (fr)

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CN109031620B (zh) * 2018-08-30 2020-10-02 浙江舜宇光学有限公司 光学成像镜片组
WO2021128387A1 (fr) * 2019-12-28 2021-07-01 诚瑞光学(常州)股份有限公司 Lentille optique de caméra
WO2021128396A1 (fr) * 2019-12-28 2021-07-01 诚瑞光学(常州)股份有限公司 Lentille optique d'appareil de prise de vues
WO2021128399A1 (fr) * 2019-12-28 2021-07-01 诚瑞光学(常州)股份有限公司 Lentille de caméra optique
WO2021128393A1 (fr) * 2019-12-28 2021-07-01 诚瑞光学(常州)股份有限公司 Lentille optique d'appareil de prise de vues
CN112230386B (zh) * 2020-10-30 2021-09-24 诚瑞光学(苏州)有限公司 摄像光学镜头
CN112230375B (zh) * 2020-10-30 2021-10-01 诚瑞光学(苏州)有限公司 摄像光学镜头
CN112462503B (zh) * 2020-12-29 2022-03-15 福建师范大学 一种抗辐射高分辨率星载相机镜头

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