WO2020024635A1 - Objectif d'imagerie optique - Google Patents

Objectif d'imagerie optique Download PDF

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Publication number
WO2020024635A1
WO2020024635A1 PCT/CN2019/084948 CN2019084948W WO2020024635A1 WO 2020024635 A1 WO2020024635 A1 WO 2020024635A1 CN 2019084948 W CN2019084948 W CN 2019084948W WO 2020024635 A1 WO2020024635 A1 WO 2020024635A1
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Prior art keywords
lens
optical imaging
imaging lens
object side
image side
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PCT/CN2019/084948
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English (en)
Chinese (zh)
Inventor
丁玲
吕赛锋
李明
闻人建科
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浙江舜宇光学有限公司
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Publication of WO2020024635A1 publication Critical patent/WO2020024635A1/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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Definitions

  • the present application relates to an optical imaging lens, and more particularly, the present application relates to an optical imaging lens including seven lenses.
  • the present application provides such an optical 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, Sixth lens and seventh lens.
  • the first lens may have negative power, the object side may be convex, and the image side may be concave; the second lens may have power; the third lens may have positive power; the fourth lens may have positive power; The five lenses have power; the sixth lens has power; and the seventh lens may have negative power, and both the object side and the image side may be concave.
  • the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens may satisfy -3.5 ⁇ f1 / f ⁇ -2.
  • the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens may satisfy 0 ⁇ f4 / f3 ⁇ 0.5.
  • the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens may satisfy 0.5 ⁇ R3 / R4 ⁇ 1.5.
  • the curvature radius R7 of the object side of the fourth lens and the total effective focal length f of the optical imaging lens may satisfy 1 ⁇ R7 / f ⁇ 1.8.
  • the curvature radius R14 of the image side of the seventh lens and the curvature radius R13 of the object side of the seventh lens may satisfy -2.1 ⁇ R14 / R13 ⁇ 0.
  • the separation distance T12 on the optical axis between the first lens and the second lens and a half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, ImgH can satisfy 0.7 ⁇ T12 / ImgH ⁇ 1.2.
  • the center thickness CT6 of the sixth lens on the optical axis and the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the optical imaging lens may satisfy 0.7 ⁇ CT6 / TTL * 10 ⁇ 1.7.
  • the center thickness CT7 of the seventh lens on the optical axis and the effective focal length f7 of the seventh lens satisfy ⁇ 0.8 ⁇ CT7 / f7 ⁇ 0.
  • the maximum effective half-aperture DT11 of the object side of the first lens and the maximum effective half-aperture DT12 of the image side of the first lens may satisfy 1.8 ⁇ DT11 / DT12 ⁇ 2.3.
  • the maximum effective half-aperture DT72 of the image side of the seventh lens and the maximum effective half-aperture DT71 of the object side of the seventh lens may satisfy 1.5 ⁇ DT72 / DT71 ⁇ 2.
  • the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy f / EPD ⁇ 2.0.
  • 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 optical imaging lens has a wide angle, large aperture, and miniaturization. , At least one beneficial effect, such as high imaging quality.
  • FIG. 1 shows a schematic structural diagram of an optical 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 aberrations of the optical imaging lens of Embodiment 1; curve;
  • FIG. 3 shows a schematic structural diagram of an optical 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 aberrations of the optical imaging lens of Embodiment 2; curve;
  • FIG. 5 shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application
  • FIGS. 6A to 6D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging lens of Embodiment 3, respectively. curve;
  • FIG. 9 shows a schematic structural diagram of an optical 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 aberrations of the optical imaging lens of Embodiment 5; curve;
  • FIG. 11 shows a schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application
  • FIGS. 12A to 12D respectively show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging lens of Embodiment 6; curve;
  • FIG. 15 shows a schematic structural diagram of an optical 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 aberrations of the optical imaging lens of Embodiment 8 respectively. curve;
  • FIG. 17 shows a schematic structural diagram of an optical 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 aberrations of the optical imaging lens of Embodiment 9; curve;
  • FIG. 19 shows a schematic structural diagram of an optical imaging lens according to Example 10 of the present application
  • FIGS. 20A to 20D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging lens of Example 10, respectively. 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 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 closest to the object side is called the object side of the lens, and the surface of each lens closest to the image side is called the image side of the lens.
  • An optical 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 first lens. Seven lenses. The seven lenses are sequentially arranged along the optical axis from the object side to the image side, and each adjacent lens can have an air gap.
  • the first lens may have negative power
  • the object side may be convex
  • the image side may be concave
  • the second lens may have positive or negative power
  • the third lens may have positive power
  • the fourth lens may have a positive or negative power
  • the sixth lens may have a positive or negative power
  • the seventh lens may have a negative power
  • the side surface may be concave, and the image side may be concave.
  • the optical imaging lens of the present application may satisfy a conditional expression -3.5 ⁇ f1 / f ⁇ -2, where f is a total effective focal length of the optical imaging lens and f1 is an effective focal length of the first lens. More specifically, f and f1 can further satisfy -3.27 ⁇ f1 / f ⁇ -2.01. If the conditional expression -3.5 ⁇ f1 / f ⁇ -2 is satisfied, the angle of view can be increased, the incident angle of the light at the second lens can be slowed, and the aperture of the subsequent lens can be reduced to maintain the lens miniaturization.
  • the optical imaging lens of the present application can satisfy the conditional expression
  • Focal length, f5 is the effective focal length of the fifth lens. More specifically, f, f2, and f5 can further satisfy 0 ⁇
  • Reasonably controlling the power of the second lens and the fifth lens can effectively balance the high-level coma and vertical axis chromatic aberrations produced by the second lens and the fifth lens, and at the same time reduce the aperture of the third lens and the fourth lens.
  • the optical imaging lens of the present application may satisfy a conditional expression of 0 ⁇ f4 / f3 ⁇ 0.5, where f4 is an effective focal length of the fourth lens, and f3 is an effective focal length of the third lens. More specifically, f4 and f3 can further satisfy 0.01 ⁇ f4 / f3 ⁇ 0.25.
  • Reasonable distribution of the power of the third lens and the fourth lens can effectively reduce the advanced spherical aberration and astigmatism generated by the third lens and the fourth lens, and at the same time, can reduce the deviation of light in the third lens and the fourth lens. Bend the angle to reduce the sensitivity of these two lenses.
  • the optical imaging lens of the present application can satisfy the conditional expression -0.8 ⁇ CT7 / f7 ⁇ 0, where CT7 is the center thickness of the seventh lens on the optical axis and f7 is the effective focal length of the seventh lens. More specifically, CT7 and f7 can further satisfy -0.67 ⁇ CT7 / f7 ⁇ -0.20.
  • Reasonably controlling the power and center thickness of the seventh lens can effectively balance the distortion and chromatic aberrations of the front lens that are not completely eliminated while reducing the system size, and further improve the imaging quality of the lens.
  • the optical imaging lens of the present application can satisfy the conditional expression 0.5 ⁇ R3 / R4 ⁇ 1.5, where R3 is the radius of curvature of the object side of the second lens and R4 is the radius of curvature of the image side of the second lens . More specifically, R3 and R4 can further satisfy 0.57 ⁇ R3 / R4 ⁇ 1.41.
  • Reasonably controlling the curvature radius of the object side and the image side of the second lens can alleviate the deflection angle of the light in the second lens, and can effectively balance the chromatic aberration and distortion generated by the first lens.
  • the optical imaging lens of the present application can satisfy the conditional expression 1 ⁇ R7 / f ⁇ 1.8, where R7 is the curvature radius of the object side of the fourth lens, and f is the total effective focal length of the optical imaging lens. More specifically, R7 and f can further satisfy 1.14 ⁇ R7 / f ⁇ 1.66.
  • Reasonably controlling the curvature radius of the object side of the fourth lens and the total effective focal length of the optical imaging lens can slow down the incident angle of the light in the fourth lens and can effectively balance the residual high-level aberration and astigmatism of the front lens.
  • the optical imaging lens of the present application can satisfy the conditional expression -2.1 ⁇ R14 / R13 ⁇ 0, where R14 is the curvature radius of the image side of the seventh lens, and R13 is the curvature of the object side of the seventh lens. radius. More specifically, R14 and R13 can further satisfy -2.09 ⁇ R14 / R13 ⁇ -0.01.
  • Reasonably controlling the curvature radius of the object side and the image side of the seventh lens can reduce the incident angle of light on the image plane, enhance the illuminance of the edge field of view, and facilitate the matching of the lens and the chip's principal light angle (CRA).
  • CRA principal light angle
  • the optical imaging lens of the present application can satisfy a conditional expression of 72 ° ⁇ HFOV ⁇ 92 °, where HFOV is a maximum half field angle of the optical imaging lens. More specifically, HFOV can further satisfy 72.5 ° ⁇ HFOV ⁇ 91.0 °. Under the premise of ensuring the miniaturization of the lens, by controlling the field of view, the aberration of the edge field of view can be avoided and the illuminance is too low, which is conducive to ensuring that the lens has excellent imaging quality in a wide field of view.
  • the optical imaging lens of the present application can satisfy the conditional expression 0.7 ⁇ T12 / ImgH ⁇ 1.2, where T12 is the distance between the first lens and the second lens on the optical axis, and ImgH is the Half of the diagonal of the effective pixel area on the imaging surface. More specifically, T12 and ImgH can further satisfy 0.97 ⁇ T12 / ImgH ⁇ 1.14.
  • Reasonably controlling the air distance between the first lens and the second lens on the optical axis is not only conducive to the assembly of the lens, but also shortens the size of the lens. At the same time, it can slow the incident angle of light into the second lens and reduce the sensitivity of the lens.
  • the optical imaging lens of the present application can satisfy the conditional expression 1.8 ⁇ DT11 / DT12 ⁇ 2.3, where DT11 is a maximum effective half-diameter of the object side of the first lens, and DT12 is an image side of the first lens. Maximum effective half-caliber. More specifically, DT11 and DT12 can further satisfy 1.92 ⁇ DT11 / DT12 ⁇ 2.21.
  • the optical imaging lens of the present application may satisfy the conditional expression 1.5 ⁇ DT72 / DT71 ⁇ 2, where DT72 is the maximum effective half-diameter of the image side of the seventh lens, and DT71 is the maximum effective half-diameter of the image side of the seventh lens. Maximum effective half-caliber. More specifically, DT72 and DT71 can further satisfy 1.63 ⁇ DT72 / DT71 ⁇ 1.84.
  • the maximum effective half-aperture of the object side and the image side of the seventh lens the size of the rear end of the lens can be reduced while ensuring the illuminance of the edge field of view.
  • the optical imaging lens of the present application can satisfy the conditional expression 0.7 ⁇ CT6 / TTL * 10 ⁇ 1.7, where CT6 is the center thickness of the sixth lens on the optical axis, and TTL is the object side of the first lens Distance to the imaging axis of the optical imaging lens on the optical axis. More specifically, CT6 and TTL can further satisfy 0.96 ⁇ CT6 / TTL * 10 ⁇ 1.58.
  • Reasonably controlling the central thickness of the sixth lens on the optical axis and the axial distance from the object side of the first lens to the imaging surface can ensure the miniaturization of the lens and avoid problems such as processing difficulties caused by the thin lens.
  • satisfying the conditional expression 0.7 ⁇ CT6 / TTL * 10 ⁇ 1.7 is also beneficial to alleviate the deflection angle of the light in the sixth lens and further balance the advanced coma and astigmatism that are not completely eliminated by the front lens.
  • the above-mentioned optical imaging lens may further include a diaphragm to improve the imaging quality of the lens.
  • the diaphragm may be disposed between the third lens and the fourth lens.
  • the above-mentioned optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element on the imaging surface.
  • the optical 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 optical imaging lens configured as above can also have beneficial effects such as wide angle, large aperture, and excellent 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, which have 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 may be changed to obtain various results and advantages described in this specification.
  • the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may further include other numbers of lenses. Specific examples of the optical 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 optical imaging lens according to Embodiment 1 of the present application.
  • the optical imaging lens 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, a fourth lens E4, The fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
  • the first lens E1 has a negative optical power, and an object side surface S1 thereof is a convex surface, and an 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 concave 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 positive power, and the object side surface S7 is a convex 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 positive power
  • the object side surface S11 is a convex 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 concave surface
  • the image side surface S14 is a concave surface.
  • the light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • an aperture may be provided between the third lens E3 and the fourth lens E4 to improve the imaging quality of the lens.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical 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. .
  • FIG. 3 is a schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application.
  • the optical imaging lens 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, a fourth lens E4, The fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
  • the first lens E1 has a negative optical power, and an object side surface S1 thereof is a convex surface, and an 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 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 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 positive power
  • the object side surface S11 is a convex 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 concave surface
  • the image side surface S14 is a concave surface.
  • the light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • an aperture may be provided between the third lens E3 and the fourth lens E4 to improve the imaging quality of the lens.
  • Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical 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 effective focal lengths f1 to f7 of the lenses in Example 2, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side S1 to the imaging surface S15 of the first lens E1, and the maximum half-view Field angle HFOV.
  • FIG. 5 is a schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application.
  • the optical imaging lens 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, a fourth lens E4, The fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
  • 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 convex 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 concave surface
  • the image side surface S14 is a concave surface.
  • the light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • an aperture may be provided between the third lens E3 and the fourth lens E4 to improve the imaging quality of the lens.
  • FIG. 9 is a schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a positive power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a convex surface.
  • the seventh lens E7 has a negative power
  • the object side surface S13 is a concave surface
  • the image side surface S14 is a concave surface.
  • the light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • an aperture may be provided between the third lens E3 and the fourth lens E4 to improve the imaging quality of the lens.
  • Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of Example 6, where the units of the radius of curvature and thickness are millimeters (mm).
  • Table 17 shows the higher-order coefficients that can be used for each aspherical mirror surface in Embodiment 6, where each aspherical surface type can be defined by the formula (1) given in the above-mentioned Embodiment 1.
  • Table 18 shows the effective focal lengths f1 to f7 of the lenses in Example 6, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side S1 to the imaging surface S15 of the first lens E1, and the maximum half field of view. Angular HFOV.
  • FIG. 14A shows an on-axis chromatic aberration curve of the optical 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 optical 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 optical imaging lens of Example 7, which represents the value of the distortion magnitude in the case of different fields of view.
  • FIG. 14D shows a magnification chromatic aberration curve of the optical imaging lens of Example 7, which represents the deviation of light at different image heights on the imaging surface after passing through the lens.
  • the optical imaging lens provided in Embodiment 7 can achieve good imaging quality.
  • the first lens E1 has a negative optical power, and an object side surface S1 thereof is a convex surface, and an 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 concave 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 convex surface.
  • FIG. 17 is a schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application.
  • 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 convex 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 concave surface
  • the image side surface S14 is a concave surface.
  • the light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15.
  • an aperture may be provided between the third lens E3 and the fourth lens E4 to improve the imaging quality of the lens.
  • Table 25 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical 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 effective focal lengths f1 to f7 of each lens, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side S1 to the imaging surface S15 of the first lens E1, and the maximum half field of view Angular HFOV.
  • FIG. 18A shows an on-axis chromatic aberration curve of the optical 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 optical 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 optical imaging lens of Example 9, which represents the value of the distortion magnitude under different field of view conditions.
  • FIG. 18D shows the magnification chromatic aberration curve of the optical imaging lens of Example 9, which represents the deviation of light at different image heights on the imaging surface after passing through the lens. According to FIG. 18A to FIG. 18D, it can be known that the optical imaging lens provided in Embodiment 9 can achieve good imaging quality.
  • Table 28 shows the surface type, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the optical imaging lens of Example 10.
  • the units of the radius of curvature and the 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 effective focal lengths f1 to f7 of each lens, the total effective focal length f of the optical imaging lens, the distance TTL on the optical axis from the object side S1 to the imaging surface S15 of the first lens E1 and the maximum half field of view Angular HFOV.

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Abstract

La présente invention concerne un objectif d'imagerie optique qui comprend, séquentiellement d'un côté objet à un côté image le long d'un axe optique : une première lentille (E1), une deuxième lentille (E2), une troisième lentille (E3), une quatrième lentille (E4), une cinquième lentille (E5), une sixième lentille (E6) et une septième lentille (E7). La première lentille (E1) a une puissance focale négative, une surface côté objet (S1) de celle-ci étant une surface convexe et une surface côté image (S2) de celle-ci étant une surface concave. La deuxième lentille (E2), la cinquième lentille (E5) et la sixième lentille (E6) ont chacune une puissance focale. La troisième lentille (E3) et la quatrième lentille (E4) ont chacune une puissance focale positive. La septième lentille (E7) a une puissance focale négative, la surface côté objet (S13) et la surface côté image (S14) de celle-ci étant des surfaces concaves. La distance focale effective f1 de la première lentille (E1) et la distance focale effective totale f de l'objectif d'imagerie optique satisfont à l'équation -3,5＜f1/f＜-2.
PCT/CN2019/084948 2018-08-02 2019-04-29 Objectif d'imagerie optique WO2020024635A1 (fr)

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