WO2019228017A1 - Objectif d'imagerie - Google Patents

Objectif d'imagerie Download PDF

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Publication number
WO2019228017A1
WO2019228017A1 PCT/CN2019/077468 CN2019077468W WO2019228017A1 WO 2019228017 A1 WO2019228017 A1 WO 2019228017A1 CN 2019077468 W CN2019077468 W CN 2019077468W WO 2019228017 A1 WO2019228017 A1 WO 2019228017A1
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Prior art keywords
lens
imaging
imaging lens
focal length
effective focal
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PCT/CN2019/077468
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English (en)
Chinese (zh)
Inventor
徐标
张凯元
游兴海
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浙江舜宇光学有限公司
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Publication of WO2019228017A1 publication Critical patent/WO2019228017A1/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

Definitions

  • the present application relates to an imaging lens, and more particularly, the present application relates to an imaging lens including seven lenses.
  • imaging lenses used with portable electronic products In addition to requiring imaging lenses with high resolution and high relative brightness, they also require imaging lenses to have telephoto performance.
  • the combination of the telephoto lens and the wide-angle lens makes the imaging system have a better imaging effect.
  • its imaging lens should also ensure ultra-thin characteristics while ensuring high imaging quality and long focal length.
  • the present application provides an imaging 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 an imaging 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 sixth lens.
  • the first lens has a positive or negative power;
  • the second lens has a positive or negative power;
  • the third lens may have a negative power;
  • the fourth lens may have a negative power;
  • the side can be concave, and the image side can be concave;
  • the fifth lens has positive or negative power;
  • the sixth lens has positive or negative power;
  • the seventh lens can have positive power, and its image side can Is convex.
  • the total effective focal length f of the imaging lens and the effective focal length f1 of the first lens may satisfy 1.5 ⁇ f /
  • the maximum half field angle HFOV of the imaging lens can satisfy HFOV ⁇ 20 °.
  • the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens may satisfy 1 ⁇ (R7-R8) / (R7 + R8) ⁇ 3.
  • the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens may satisfy 1 ⁇
  • the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the imaging lens and the total effective focal length f of the imaging lens may satisfy TTL / f ⁇ 1.
  • the curvature radius R1 of the object side of the first lens and the curvature radius R6 of the image side of the third lens may satisfy 2 ⁇
  • the total effective focal length f of the imaging lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens may satisfy 0 ⁇
  • the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens may satisfy -3 ⁇ f6 / f7 ⁇ 0.
  • the sum ⁇ CT of the total effective focal length f of the imaging lens and the center thickness of the first lens to the seventh lens on the optical axis may satisfy 1.5 ⁇ f / ⁇ CT ⁇ 3.
  • the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis may satisfy 1.5 ⁇ (CT2 + CT4). / CT3 ⁇ 3.
  • the separation distance T45 on the optical axis of the fourth lens and the fifth lens and the separation distance T56 on the optical axis of the fifth lens and the sixth lens may satisfy 1.5 ⁇ T45 / T56 ⁇ 4.
  • This application uses seven lenses. By reasonably distributing the power, surface shape, center thickness of each lens, and the axial distance between each lens, the imaging lens has a long focal length, ultra-thin, and excellent imaging. At least one beneficial effect such as quality, low sensitivity.
  • 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;
  • FIGS. 8A to 8D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 4, respectively;
  • 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 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the imaging lens of Embodiment 6, respectively;
  • 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.
  • An imaging lens may include, for example, seven lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. lens. These seven 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 or negative power; the second lens has positive or negative power; the third lens may have negative power; the fourth lens may have negative light Power, the object side can be concave, the image side can be concave; the fifth lens has positive or negative power; the sixth lens has positive or negative power; the seventh lens can have positive power , Its image side can be convex.
  • the first lens has positive or negative power; the second lens has positive or negative power; and the third lens may have negative power.
  • the first lens may have a positive power and the second lens may have a negative power.
  • the object side of the first lens may be convex.
  • the image side of the third lens may be concave.
  • Both the object side and the image side of the fourth lens may be concave.
  • Such a surface configuration is advantageous for adjusting the angle of the incident and outgoing light of the fourth lens, which can effectively reduce the sensitivity of the system and make the system have good processing characteristics.
  • the fifth lens has positive or negative power; the sixth lens has positive or negative power; and the seventh lens may have positive power.
  • the reasonable combination of the fifth lens, the sixth lens, and the seventh lens can help balance the high-order aberrations generated by the front lens, make the field of view have smaller aberrations, and can be beneficial to the system's main light Match with the image surface.
  • the sixth lens may have a negative power.
  • the imaging lens of the present application may satisfy a conditional expression 1.5 ⁇ f /
  • the effective focal length of the first lens it can produce negative spherical aberration to balance it with the positive spherical aberration produced by other lenses, so that the system has good imaging quality on the axis.
  • the imaging lens of the present application can satisfy the conditional expression 1 ⁇ (R7-R8) / (R7 + R8) ⁇ 3, where R7 is the curvature radius of the object side of the fourth lens and R8 is the fourth The radius of curvature of the image side of the lens. More specifically, R7 and R8 can further satisfy 1.5 ⁇ (R7-R8) / (R7 + R8) ⁇ 2.5, such as 1.90 ⁇ (R7-R8) / (R7 + R8) ⁇ 2.29.
  • the imaging lens of the present application can satisfy the conditional expression 1.5 ⁇ f / ⁇ CT ⁇ 3, where f is the total effective focal length of the imaging lens, and ⁇ CT is the first lens to the seventh lens respectively on the optical axis. Sum of the center thickness on the. More specifically, f and ⁇ CT can further satisfy 2.0 ⁇ f / ⁇ CT ⁇ 2.5, for example, 2.16 ⁇ f / ⁇ CT ⁇ 2.26. By controlling the sum of the thickness of each lens in the imaging lens, the distortion range of the system can be controlled reasonably and the system has less distortion.
  • the imaging lens of the present application may satisfy the conditional expression 1 ⁇
  • the effective focal lengths of the first lens and the fourth lens the spherical aberration contribution of the fourth lens can be controlled within a reasonable range, so that the on-axis field of view can obtain good imaging quality.
  • the imaging lens of the present application can satisfy the conditional expression 1.5 ⁇ (CT2 + CT4) / CT3 ⁇ 3, where CT2 is the center thickness of the second lens on the optical axis and CT3 is the third lens on the light The central thickness on the axis, CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT2, CT3, and CT4 can further satisfy 2.0 ⁇ (CT2 + CT4) /CT3 ⁇ 2.3, for example, 2.05 ⁇ (CT2 + CT4) /CT3 ⁇ 2.14.
  • the imaging lens of the present application can satisfy the conditional expression 2 ⁇
  • the coma contribution rate of the first lens and the third lens can be controlled within a reasonable range, which can be well balanced
  • the coma produced by the front lens to obtain good imaging quality.
  • the imaging lens of the present application can satisfy the conditional expression 1.5 ⁇ T45 / T56 ⁇ 4, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, and T56 is the fifth lens and the first lens.
  • T45 and T56 can further satisfy 2.0 ⁇ T45 / T56 ⁇ 3.7, such as 2.11 ⁇ T45 / T56 ⁇ 3.52.
  • the imaging lens of the present application can satisfy the conditional expression 0 ⁇
  • Focal length, f3 is the effective focal length of the third lens. More specifically, f, f2, and f3 can further satisfy 0.5 ⁇
  • the imaging lens of the present application may satisfy a conditional expression -3 ⁇ f6 / f7 ⁇ 0, where f6 is an effective focal length of the sixth lens and f7 is an effective focal length of the seventh lens. More specifically, f6 and f7 can further satisfy -2.90 ⁇ f6 / f7 ⁇ -0.70, for example, -2.83 ⁇ f6 / f7 ⁇ -0.80.
  • the sixth lens and the seventh lens can have reasonable third-order positive spherical aberration contribution and fifth-order negative spherical aberration contribution Range, so that the remaining spherical aberration generated by the front lens can be balanced, so that the image quality of the field of view area on the axis of the imaging lens reaches a better level.
  • 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 object side and the first lens.
  • the aforementioned imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting a 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 seven 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 imaging lens configured as above can also have beneficial effects such as ultra-thin, long focal length, excellent imaging quality, and low sensitivity.
  • 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 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 seven lenses. If desired, the imaging lens may also 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 an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative 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 negative power, and the object side surface S7 is a concave 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
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 1, where 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 S1-S14 in Example 1. .
  • Table 3 shows the half of the effective pixel area diagonal length ImgH on the imaging surface S17 of the imaging lens in Example 1 and the total optical length TTL (ie, from the object side S1 to the imaging surface S17 of the first lens E1 on the optical axis). Distance), the maximum half field angle HFOV, the aperture number Fno, the total effective focal length f, and the effective focal lengths f1 to f7 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 illustrates 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 the light passes through the lens. It can be known from FIG. 2A to FIG. 2D that 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, an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave 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
  • 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 filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 2, where 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 on the imaging surface S17 of the imaging lens of Example 2 in 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 f7.
  • FIG. 4A shows an on-axis chromatic aberration curve of the imaging lens of Embodiment 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 value of the distortion magnitude corresponding to different image heights.
  • FIG. 4D shows the magnification chromatic aberration curve of the imaging lens of Example 2, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. According to FIG. 4A to FIG. 4D, it can be known that 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 sequentially includes an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 negative 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 negative power, and the object side surface S7 is a concave 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
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • Table 7 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 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 effective pixel area diagonal length ImgH on the imaging surface S17 of the imaging lens in Example 3, the total optical length TTL, the maximum half field angle HFOV, the aperture number Fno, the total effective focal length f, and the length of each lens. Effective focal lengths f1 to f7.
  • FIG. 6A shows an on-axis chromatic aberration curve of the imaging lens of Embodiment 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 the 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 plane after the light passes through the lens. It can be seen from FIGS. 6A to 6D that 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 an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave 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
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • Table 10 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 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 S17 of the imaging lens of Example 4 in 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 f7.
  • 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 an 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 value of the distortion magnitude corresponding to different image heights.
  • FIG. 8D shows a magnification chromatic aberration curve of the imaging lens of Example 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to FIG. 8A to FIG. 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, an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave surface, and the image side surface S8 is a concave surface.
  • the fifth lens E5 has a positive power, and its object side surface S9 is convex, and its image side surface S10 is convex.
  • the sixth lens E6 has a negative power, and the object side surface S11 is a concave surface, and the image side surface S12 is a convex surface.
  • the seventh lens E7 has a positive power, and the object side surface S13 is a concave surface, and the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • 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 both 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 effective pixel area diagonal length ImgH on the imaging surface S17 of the imaging lens in Example 5, 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 f7.
  • FIG. 10A shows an on-axis chromatic aberration curve of the imaging lens of Example 5, which indicates that light rays of different wavelengths deviate from the focal point after passing through the lens.
  • FIG. 10B shows an astigmatism curve of the imaging lens of Example 5, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 10C shows a distortion curve of the imaging lens of Example 5, which represents the value of the distortion magnitude 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 sequentially includes an aperture STO, a first lens E1, a second lens E2, a third lens E3, and a fourth lens along the optical axis from the object side to the image side.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave 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 positive power
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • 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 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 S17 of the imaging lens of Example 6 in 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 f7.
  • 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 an 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 the distortion curve of the imaging lens 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 imaging lens of Example 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to FIG. 12A to FIG. 12D, it can be known that 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 sequentially includes an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave 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 positive power
  • the object side surface S13 is a convex surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • 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 the half of the diagonal length of the effective pixel area on the imaging surface S17 of the imaging lens in Example 7 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 f7.
  • 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 an astigmatism curve of the imaging lens of Example 7, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 14C shows a distortion curve of the imaging lens of Example 7, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 14D shows a magnification chromatic aberration curve of the imaging lens of Example 7, which represents deviations of different image heights on the imaging plane after 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 sequentially includes an aperture STO, a first lens E1, a second lens E2, a third lens E3, and a fourth lens along the optical axis from the object side to the image side.
  • the lens E4 the fifth lens E5, the sixth lens E6, the seventh lens E7, the filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave 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 concave 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 filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • 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 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 S17 of the imaging lens of Example 8 in 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 f7.
  • 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 an astigmatism curve of the imaging lens of Example 8, which represents 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 surface after light passes through the lens. It can be known from FIGS. 16A to 16D that 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, an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 negative power, and the object side surface S7 is a concave 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 positive power
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • 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 S17 of the imaging lens of Example 9 in 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 f7.
  • FIG. 18A shows 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 represents 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 value of the distortion magnitude corresponding to different image heights.
  • FIG. 18D shows a magnification chromatic aberration curve of the imaging lens of Example 9, 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 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, an aperture STO, a first lens E1, 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 filter E8, and the imaging surface S17.
  • 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 convex surface.
  • the second lens E2 has a negative power, and the object side surface S3 is a concave 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 concave surface.
  • the fourth lens E4 has a negative power, and the object side surface S7 is a concave 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 positive power
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a convex surface.
  • the filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.
  • 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 S17 of the imaging lens 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 the Effective focal lengths f1 to f7.
  • 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 represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 20C illustrates a distortion curve of the imaging lens of Example 10, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 20D shows a magnification chromatic aberration curve of the imaging lens of Example 10, which represents deviations of different image heights on the imaging plane after light passes through the lens. It can be seen from FIGS. 20A to 20D 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

La présente invention concerne un objectif d'imagerie. L'objectif d'imagerie comprend, à partir d'un côté image le long d'un axe optique, une première lentille, une deuxième lentille, une troisième lentille, une quatrième lentille, une cinquième lentille, une sixième lentille, et une septième lentille en séquence. La première lentille a une puissance focale ; la deuxième lentille a une puissance focale ; la troisième lentille a une puissance focale négative ; la quatrième lentille a une puissance focale négative, sa surface côté objet est une surface concave, et sa surface côté image est une surface convexe ; la cinquième lentille a une puissance focale ; la sixième lentille a une puissance focale ; la septième lentille a une puissance focale positive, et sa surface côté image est une surface convexe ; et un entrefer se trouve entre deux lentilles adjacentes quelconques.
PCT/CN2019/077468 2018-05-28 2019-03-08 Objectif d'imagerie WO2019228017A1 (fr)

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