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WO2020038134A1 - Système d'imagerie optique - Google Patents

Système d'imagerie optique Download PDF

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Publication number
WO2020038134A1
WO2020038134A1 PCT/CN2019/095204 CN2019095204W WO2020038134A1 WO 2020038134 A1 WO2020038134 A1 WO 2020038134A1 CN 2019095204 W CN2019095204 W CN 2019095204W WO 2020038134 A1 WO2020038134 A1 WO 2020038134A1
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Prior art keywords
lens
imaging system
optical imaging
object side
image side
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Ceased
Application number
PCT/CN2019/095204
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English (en)
Chinese (zh)
Inventor
黄林
游兴海
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Application filed by Zhejiang Sunny Optics Co Ltd filed Critical Zhejiang Sunny Optics Co Ltd
Publication of WO2020038134A1 publication Critical patent/WO2020038134A1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the present application relates to an optical imaging system, and more particularly, the present application relates to an optical imaging system including seven lenses.
  • the aperture number (F-number) of existing lenses is usually configured to be 2.0 or more, so as to take into account both miniaturization and good optical performance.
  • the F number is 2.0 Or lenses of 2.0 or higher can no longer meet higher-level imaging requirements.
  • the present application provides an optical imaging system, such as a large-aperture imaging lens, which can be applied to portable electronic products and can at least solve or partially solve at least one of the above disadvantages in the prior art.
  • the optical imaging system includes: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order from the object side to the image side along the optical axis.
  • Lens, sixth lens, and seventh lens The first lens may have a positive power; the second lens may have a negative power; the third lens has a power; the fourth lens has a power; the fifth lens has a power and the image side may be concave;
  • the sixth lens may have a positive power, and both the object side and the image side may be convex; the seventh lens may have a negative power, and the object side may be concave.
  • the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is ImgH
  • the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy ImgH / (f / EPD) ⁇ 2.4mm.
  • the combined focal length f123 of the first lens, the second lens, and the third lens and the total effective focal length f of the optical imaging system may satisfy 0.5 ⁇ f123 / f ⁇ 1.5.
  • the curvature radius R1 of the object side of the first lens and the effective focal length f1 of the first lens may satisfy 0.2 ⁇ R1 / f1 ⁇ 0.7.
  • the curvature radius R4 of the image side of the second lens and the curvature radius R3 of the object side of the second lens may satisfy 0.3 ⁇ R4 / R3 ⁇ 0.8.
  • the total effective focal length f of the optical imaging system, the combined focal length f45 of the fourth lens and the fifth lens, and the combined focal length f67 of the sixth lens and the seventh lens may satisfy
  • the curvature radius R9 of the object side of the fifth lens, the curvature radius R10 of the image side of the fifth lens, and the effective focal length f5 of the fifth lens satisfy 0 ⁇ (R9 + R10) /
  • the center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis may satisfy 1.2 ⁇ CT6 / CT7 ⁇ 1.9.
  • the curvature radius R11 of the object side of the sixth lens, the curvature radius R12 of the image side of the sixth lens, 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 be Satisfy 0.4 ⁇ (R11 + R12) /
  • the maximum effective half-aperture DT51 of the object side of the fifth lens and the maximum effective half-aperture DT71 of the object side of the seventh lens may satisfy 0.3 ⁇ DT51 / DT71 ⁇ 0.7.
  • the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis may satisfy 0.3 ⁇ ET6 / CT6 ⁇ 0.7.
  • the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system and half the diagonal length of the effective pixel area on the imaging surface of the optical imaging system, ImgH can satisfy TTL / ImgH ⁇ 1.65.
  • the center thickness CT1 of the first 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 system may satisfy 1.1 ⁇ CT1 / TTL ⁇ 10 ⁇ 1.6.
  • This application uses multiple (for example, seven) lenses.
  • the above-mentioned optical imaging system has super At least one beneficial effect such as thinness, miniaturization, large aperture, and high imaging quality.
  • FIG. 1 shows a schematic structural diagram of an optical imaging system 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 system of Embodiment 1; curve;
  • FIG. 3 shows a schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application
  • FIGS. 4A to 4D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Embodiment 2 respectively. curve;
  • FIG. 5 shows a schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application
  • FIGS. 6A to 6D respectively show the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration of the optical imaging system of Embodiment 3 curve;
  • FIG. 7 shows a schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application
  • FIGS. 8A to 8D show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberrations of the optical imaging system of Embodiment 4 respectively. curve;
  • FIG. 9 shows a schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application
  • FIGS. 10A to 10D show the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration of the optical imaging system of Embodiment 5 respectively. curve;
  • FIG. 11 shows a schematic structural diagram of an optical imaging system 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 aberrations of the optical imaging system of Embodiment 6 respectively. curve;
  • FIG. 13 shows a schematic structural diagram of an optical imaging system 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 aberrations of the optical imaging system of Embodiment 7 curve;
  • FIG. 15 shows a schematic structural diagram of an optical imaging system 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 system of Embodiment 8 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 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 closest to the subject in each lens is called the object side of the lens; the surface closest to the imaging plane in each lens is called the image side of the lens.
  • An optical imaging system 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. These seven lenses are sequentially arranged along the optical axis from the object side to the image side, and any two adjacent lenses can have an air gap.
  • the first lens may have a positive power; the second lens may have a negative power; the third lens has a positive power or a negative power; the fourth lens has a positive power or a negative power
  • the fifth lens has positive or negative power, and its image side can be concave; the sixth lens can have positive power, its object side can be convex, and the image side can be convex; and the seventh lens can have For negative power, the object side can be concave.
  • the object-side surface of the first lens may be a convex surface.
  • the object side of the second lens may be convex, and the image side may be concave.
  • the object-side surface of the fifth lens may be a convex surface.
  • the image side of the seventh lens may be concave.
  • the optical imaging system of the present application can satisfy the conditional formula ImgH / (f / EPD) ⁇ 2.4mm, where ImgH is half the length of the diagonal of the effective pixel area on the imaging surface of the optical imaging system, f Is the total effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system. More specifically, ImgH, f, and EPD can further satisfy 2.44 mm ⁇ ImgH / (f / EPD) ⁇ 2.81 mm. By properly adjusting the total effective focal length, entrance pupil diameter, and image height of the optical imaging system, the optical imaging system can have characteristics such as large aperture, large image surface, and high pixels.
  • the optical imaging system of the present application may satisfy the conditional expression 0.5 ⁇ f123 / f ⁇ 1.5, where f123 is a combined focal length of the first lens, the second lens, and the third lens, and f is an optical focal length of the optical imaging system. Total effective focal length. More specifically, f123 and f can further satisfy 0.8 ⁇ f123 / f ⁇ 1.2, for example, 0.97 ⁇ f123 / f ⁇ 1.08.
  • the first lens, the second lens, and the third lens can be combined to form a lens group with a reasonable positive power. Aberration balance is performed with a lens group having a negative power at the rear end to obtain a good imaging quality and achieve the effect of high resolution.
  • the optical imaging system of the present application can satisfy the conditional expression
  • the combined focal length of the five lenses, f67 is the combined focal length of the sixth lens and the seventh lens. More specifically, f, f45, and f67 can further satisfy 0.26 ⁇
  • the aberration contribution of the four lenses can be controlled reasonably, so that the aberrations generated by the four lenses can be compared with the front end
  • the aberrations generated by the optical lens are balanced, so that the total aberration of the system is at a reasonable level, and the optical imaging system has a good imaging quality.
  • the optical imaging system of the present application can satisfy the conditional expression 0 ⁇ (R9 + R10) /
  • the contribution rate of the third-order astigmatism can be controlled to a certain extent, so that the third-order astigmatism of the fifth lens is within a reasonable range, and the macro-resolution of the imaging system is achieved. Effect.
  • the optical imaging system of the present application can satisfy the conditional expression 0.3 ⁇ R4 / R3 ⁇ 0.8, where R4 is the radius of curvature of the image side of the second lens, and R3 is the radius of curvature of the object side of the second lens . More specifically, R4 and R3 can further satisfy 0.36 ⁇ R4 / R3 ⁇ 0.61.
  • the shape of the second lens can be effectively constrained, and the aberration contribution rate, balance system, and aperture of the object image side surface of the second lens can be effectively controlled. With related aberrations and improve the imaging quality of the system.
  • the optical imaging system of the present application may satisfy a conditional expression 0.2 ⁇ R1 / f1 ⁇ 0.7, where R1 is a curvature radius of the object side of the first lens, and f1 is an effective focal length of the first lens. More specifically, R1 and f1 can further satisfy 0.48 ⁇ R1 / f1 ⁇ 0.56.
  • the fifth-order spherical aberration contribution rate of the object side of the first lens can be controlled to a certain extent to balance the fifth-order spherical aberration generated by the image side of the first lens So as to control the fifth-order spherical aberration of the first lens within a reasonable range.
  • the optical imaging system of the present application can satisfy the conditional TTL / ImgH ⁇ 1.65, where TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system, and ImgH is optical Half of the diagonal of the effective pixel area on the imaging surface of the imaging system. More specifically, TTL and ImgH can further satisfy 1.46 ⁇ TTL / ImgH ⁇ 1.61. By constraining the ratio between the axial distance from the object side of the first lens to the imaging plane and the half length of the diagonal of the effective pixel area on the imaging plane, the ultra-thinning and high pixels of the optical imaging system are achieved at the same time.
  • the optical imaging system of the present application can satisfy the conditional expression 1.2 ⁇ CT6 / CT7 ⁇ 1.9, where CT6 is the center thickness of the sixth lens on the optical axis and CT7 is the seventh lens on the optical axis. Center thickness. More specifically, CT6 and CT7 can further satisfy 1.29 ⁇ CT6 / CT7 ⁇ 1.88.
  • CT6 and CT7 can further satisfy 1.29 ⁇ CT6 / CT7 ⁇ 1.88.
  • the optical imaging system of the present application can satisfy the conditional expression 0.4 ⁇ (R11 + R12) /
  • the angle of incidence of the main ray of each field of view of the optical imaging system on the image plane can be relatively reasonably controlled to meet the main system's incidence of the main system Requirement of angle.
  • the optical imaging system of the present application can satisfy the conditional expression 1.1 ⁇ CT1 / TTL ⁇ 10 ⁇ 1.6, where CT1 is the center thickness of the first lens on the optical axis and TTL is the object side of the first lens The distance on the optical axis from the imaging surface of the optical imaging system. More specifically, CT1 and TTL can further satisfy 1.34 ⁇ CT1 / TTL ⁇ 10 ⁇ 1.43. By controlling the range of the center thickness of the first lens on the optical axis, the range of remaining distortion after balance can be controlled reasonably, so that the system has good distortion performance.
  • the optical imaging system of the present application can satisfy the conditional expression 0.3 ⁇ DT51 / DT71 ⁇ 0.7, where DT51 is the maximum effective half-diameter of the object side of the fifth lens, and DT71 is the Maximum effective half-caliber. More specifically, DT51 and DT71 can further satisfy 0.45 ⁇ DT51 / DT71 ⁇ 0.55.
  • the optical imaging system of the present application can satisfy the conditional expression 0.3 ⁇ ET6 / CT6 ⁇ 0.7, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis. More specifically, ET6 and CT6 can further satisfy 0.48 ⁇ ET6 / CT6 ⁇ 0.66.
  • the system has good imaging quality, low sensitivity, easy injection molding processing, and high yield.
  • the optical imaging system may further include a diaphragm to improve the imaging quality of the imaging system.
  • the stop can be set at any position between the object side and the image side as needed, for example, the stop can be set between the object side and the first lens.
  • the above-mentioned optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element on the imaging surface.
  • the optical imaging system according to the above embodiment of the present application may employ multiple lenses, such as the seven lenses described above.
  • the size of the system can be effectively reduced, the sensitivity of the system can be reduced, and the processability of the system can be improved.
  • the optical imaging system configured as described above can also have beneficial effects such as ultra-thinness, miniaturization, large aperture, high imaging quality, and the like.
  • 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 system can be changed to obtain various results and advantages described in this specification.
  • the optical imaging system is not limited to including seven lenses. If desired, the optical imaging system may also include other numbers of lenses. Specific examples of the optical imaging system 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 system according to Embodiment 1 of the present application.
  • an optical imaging system sequentially includes an aperture STO, a first lens E1, a second lens E2, a third lens E3, The four lenses 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 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 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 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 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, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the optical imaging system 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 gives 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 effective focal lengths f1 to f7 of the lenses in Example 1, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 2A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 1, which shows that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 2B shows an astigmatism curve of the optical imaging system 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 system of Example 1, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 2D shows the magnification chromatic aberration curve of the optical imaging system of Example 1, which represents the deviation of different image heights on the imaging plane after the light passes through the system. It can be known from FIG. 2A to FIG. 2D that the optical imaging system provided in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 is a schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a first lens
  • the four lenses 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 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 negative 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 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 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 optical imaging system of Example 2, where the units of the radius of curvature and thickness are both 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 system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 4A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 2, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 4B shows an astigmatism curve of the optical imaging system 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 system 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 system of Example 2, which represents deviations of different image heights on the imaging plane after light passes through the system. According to FIG. 4A to FIG. 4D, it can be known that the optical imaging system provided in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 is a schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, The four lenses 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 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 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 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, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system 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 effective focal lengths f1 to f7 of each lens, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17 The diagonal of the upper effective pixel area is half ImgH.
  • FIG. 6A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 3, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 6B shows an astigmatism curve of the optical imaging system of Example 3, which represents a meridional image plane curvature and a sagittal image plane curvature.
  • FIG. 6C shows a distortion curve of the optical imaging system of Example 3, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 6D shows the magnification chromatic aberration curve of the optical imaging system of Example 3, which represents the deviation of different image heights on the imaging plane after the light passes through the system. According to FIG. 6A to FIG. 6D, it can be known that the optical imaging system provided in Embodiment 3 can achieve good imaging quality.
  • FIG. 7 is a schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, The four lenses 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 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 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 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 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, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system 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 effective focal lengths f1 to f7 of the lenses in Example 4, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 8A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 4, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 8B shows an astigmatism curve of the optical imaging system 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 system 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 optical imaging system of Example 4, which represents deviations of different image heights on the imaging plane after light passes through the system. According to FIG. 8A to FIG. 8D, it can be known that the optical imaging system provided in Embodiment 4 can achieve good imaging quality.
  • FIG. 9 is a schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, and a first lens.
  • 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 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 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 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 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 optical imaging system 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 the effective focal lengths f1 to f7 of each lens in Example 5, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 10A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 5, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 10B shows an astigmatism curve of the optical imaging system 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 system of Example 5, which represents the value of distortion corresponding to different image heights.
  • FIG. 10D shows a magnification chromatic aberration curve of the optical imaging system of Example 5, which represents deviations of different image heights on the imaging plane after light passes through the system. It can be seen from FIGS. 10A to 10D that the optical imaging system provided in Embodiment 5 can achieve good imaging quality.
  • FIG. 11 is a schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, and a first lens.
  • 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 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 concave surface, and the image side surface S8 is a convex surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a positive power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a 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 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 optical imaging system 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 effective focal lengths f1 to f7 of the lenses in Example 6, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 12A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 6, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 12B shows an astigmatism curve of the optical imaging system 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 system of Example 6, which represents the magnitude of the distortion corresponding to different image heights.
  • FIG. 12D shows a magnification chromatic aberration curve of the optical imaging system of Example 6, which represents the deviation of different image heights on the imaging plane after the light passes through the system. According to FIG. 12A to FIG. 12D, it can be known that the optical imaging system provided in Embodiment 6 can achieve good imaging quality.
  • FIG. 13 is a schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, and a first lens.
  • 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 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 concave surface, and the image side surface S8 is a convex surface.
  • the fifth lens E5 has a positive power
  • the object side surface S9 is a convex surface
  • the image side surface S10 is a concave surface.
  • the sixth lens E6 has a positive power
  • the object side surface S11 is a convex surface
  • the image side surface S12 is a 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 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 optical imaging system 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 effective focal lengths f1 to f7 of the lenses in Example 7, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 14A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 7, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 14B shows an astigmatism curve of the optical imaging system 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 system of Example 7, which represents the magnitude of the distortion corresponding to different image heights.
  • FIG. 14D shows the magnification chromatic aberration curve of the optical imaging system of Example 7, which represents the deviation of different image heights on the imaging plane after the light passes through the system.
  • the optical imaging system given in Embodiment 7 can achieve good imaging quality.
  • FIG. 15 is a schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application.
  • the optical imaging system includes, in order from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, and a first lens.
  • 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 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 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 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 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, the radius of curvature, the thickness, the material, and the conic coefficient of each lens of the optical imaging system of Example 8.
  • 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 the effective focal lengths f1 to f7 of the lenses in Example 8, the total effective focal length f of the optical imaging system, the distance TTL on the optical axis from the object side S1 to the imaging surface S17 of the first lens E1, and the imaging surface S17.
  • the diagonal of the upper effective pixel area is half ImgH.
  • FIG. 16A shows an on-axis chromatic aberration curve of the optical imaging system of Embodiment 8, which indicates that the focal points of light with different wavelengths deviate after passing through the system.
  • FIG. 16B shows an astigmatism curve of the optical imaging system 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 system of Example 8, which represents the value of the distortion magnitude corresponding to different image heights.
  • FIG. 16D shows the magnification chromatic aberration curve of the optical imaging system of Example 8, which represents the deviation of different image heights on the imaging plane after the light passes through the system. According to FIG. 16A to FIG. 16D, it can be known that the optical imaging system 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 system described above.

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

Abstract

L'invention concerne un système d'imagerie optique. Le système d'imagerie optique comprend, d'un côté objet à 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, la première lentille ayant une puissance focale positive ; la deuxième lentille ayant une puissance focale négative ; la troisième lentille ayant une puissance focale ; la quatrième lentille ayant une puissance focale ; la cinquième lentille ayant une puissance focale, et une surface côté image de celle-ci étant une surface concave ; la sixième lentille ayant une puissance focale positive, et à la fois une surface côté objet et une surface côté image de celle-ci étant des surfaces convexes ; et la septième lentille ayant une puissance focale négative, et une surface côté objet de celle-ci étant une surface concave. La relation de la moitié de la longueur diagonale d'une région de pixel efficace sur une surface d'imagerie du système d'imagerie optique (ImgH), la distance focale effective totale du système d'imagerie optique (f) et le diamètre de pupille d'entrée du système d'imagerie optique (EPD) satisfait ImgH/(f/EPD) ≥ 2,4 mm
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