WO2022089327A1 - Lentille optique et dispositif d'imagerie - Google Patents

Lentille optique et dispositif d'imagerie Download PDF

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Publication number
WO2022089327A1
WO2022089327A1 PCT/CN2021/125793 CN2021125793W WO2022089327A1 WO 2022089327 A1 WO2022089327 A1 WO 2022089327A1 CN 2021125793 W CN2021125793 W CN 2021125793W WO 2022089327 A1 WO2022089327 A1 WO 2022089327A1
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Prior art keywords
lens
optical
object side
optical lens
focal length
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PCT/CN2021/125793
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English (en)
Chinese (zh)
Inventor
于笑枝
曾昊杰
刘绪明
曾吉勇
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江西联益光学有限公司
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Publication of WO2022089327A1 publication Critical patent/WO2022089327A1/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
    • 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 invention relates to the technical field of lens imaging, in particular to an optical lens and an imaging device.
  • wide-angle lenses have the characteristics of short focus and large field of view, which can produce large barrel distortion to create special effects and bring strong visual impact to the observer.
  • the wide-angle lens uses the large field of view to obtain more data in a single imaging to capture more scene information.
  • the market's requirements for the miniaturization of lenses are getting higher and higher.
  • the purpose of the present invention is to provide an optical lens and an imaging device for solving the above problems.
  • the present invention provides an optical lens, which sequentially includes from the object side to the imaging plane along the optical axis: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens lens and seventh lens.
  • the first lens has negative refractive power, the object side is convex, and the image side is concave;
  • the second lens has negative refractive power, and the object side is convex and the image side is concave;
  • the third lens It has positive refractive power, the object side is concave, and the image side is convex;
  • the fourth lens has positive refractive power, and its object side and image side are convex;
  • the fifth lens has positive refractive power, and its object side is The concave surface and the image side are convex;
  • the sixth lens has negative refractive power, and the object side and the image side are concave;
  • the seventh lens has negative refractive power, and the object side is convex at the near optical axis,
  • the image side surface is concave at the near optical axis, and both the object side surface and the image side surface of the seventh lens have at least one inflection point.
  • the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses.
  • the optical lens satisfies the following conditional formula: 3.0 ⁇ IH/EPD ⁇ 3.2; wherein, IH represents the maximum half image height on the imaging plane of the optical lens, and EPD represents the entrance pupil diameter of the optical lens.
  • the present invention provides an imaging device, comprising an imaging element and the optical lens provided in the first aspect, where the imaging element is used to convert an optical image formed by the optical lens into an electrical signal.
  • the optical lens and imaging device provided by the present invention can meet the requirements of high pixels and at the same time have a better structure by reasonably matching the shape of the lens among the seven lenses with specific refractive power and a reasonable combination of refractive power. It is compact, thereby better realizing the miniaturization of the wide-angle lens and the balance of high pixels.
  • the optical lens provided by the present invention can be matched with a chip of 48 million pixels, which can effectively improve the camera experience of users.
  • FIG. 1 is a schematic structural diagram of an optical lens provided by the present invention.
  • Fig. 2 shows the field curvature curve diagram of the optical lens provided by the first embodiment of the present invention
  • Fig. 3 shows the f- ⁇ distortion curve diagram of the optical lens provided by the first embodiment of the present invention
  • Fig. 4 shows the vertical axis chromatic aberration curve diagram of the optical lens provided by the first embodiment of the present invention
  • Fig. 5 shows the axial chromatic aberration curve diagram of the optical lens provided by the first embodiment of the present invention
  • Fig. 6 shows the field curvature curve diagram of the optical lens provided by the second embodiment of the present invention.
  • Fig. 7 shows the f- ⁇ distortion curve diagram of the optical lens provided by the second embodiment of the present invention.
  • Fig. 8 shows the vertical axis chromatic aberration curve diagram of the optical lens provided by the second embodiment of the present invention
  • Fig. 9 shows the axial chromatic aberration curve diagram of the optical lens provided by the second embodiment of the present invention.
  • Fig. 10 shows the field curvature curve diagram of the optical lens provided by the third embodiment of the present invention.
  • Fig. 11 shows the f- ⁇ distortion curve diagram of the optical lens provided by the third embodiment of the present invention.
  • Fig. 12 shows the vertical axis chromatic aberration curve diagram of the optical lens provided by the third embodiment of the present invention.
  • Fig. 13 shows the axial chromatic aberration curve diagram of the optical lens provided by the third embodiment of the present invention.
  • FIG. 14 shows a schematic structural diagram of an imaging device provided by a fourth embodiment of the present invention.
  • the optical lens sequentially includes from the object side to the image side along the optical axis: a first lens L1 , a second lens L2 , and a third lens L3 , diaphragm ST, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7 and filter G1, where the image side refers to the side where the imaging plane S17 is located, and the object side is the same as the image side opposite side.
  • the first lens L1 has negative refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave.
  • the second lens L2 has negative refractive power, the object side S3 of the second lens is convex, and the image side S4 of the second lens is concave.
  • the third lens L3 has positive refractive power, the object side S5 of the third lens is concave, and the image side S6 of the third lens is convex.
  • the fourth lens L4 has positive refractive power, and both the object side S7 of the fourth lens and the image side S8 of the fourth lens are convex.
  • the fifth lens L5 has positive refractive power, the object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is convex.
  • the sixth lens L6 has negative refractive power, and both the object side S11 of the sixth lens and the image side S12 of the sixth lens are concave.
  • the seventh lens L7 has negative refractive power
  • the object side S13 of the seventh lens is convex at the near optical axis and has at least one inflection point
  • the image side S14 of the seventh lens is concave at the near optical axis and has at least one Inflection point.
  • optical lens satisfies the following conditional formula:
  • IH represents the maximum half image height on the imaging plane of the optical lens
  • EPD represents the entrance pupil diameter of the optical lens
  • the optical lens satisfies the following conditional formula:
  • TTL represents the total optical length of the optical lens
  • f represents the focal length of the optical lens
  • f1 represents the focal length of the first lens
  • R1 represents the radius of curvature of the object side surface of the first lens.
  • the optical lens may also satisfy the following conditional formula:
  • SAG1 represents the edge sag of the object side of the first lens
  • SAG1 i represents the sag of any point on the object side of the first lens
  • SAG2 i represents the sag of any point on the image side of the first lens
  • CT1 represents the sag of the first lens.
  • the central thickness, ET1 represents the edge thickness of the first lens.
  • the object side of the first lens is usually more prominent, which is easy to cause the surface of the lens to be worn; and when the above conditional expressions (5), (6) and (7) are satisfied, the protrusion of the first lens can be reasonably controlled
  • the height of the front end of the lens barrel is conducive to the protection of the optical lens; at the same time, it can ensure that the thickness of the first lens is moderate, which is conducive to reducing the difficulty of correcting field curvature, and making the volume of the optical lens meet the requirement of miniaturization.
  • the optical lens may also satisfy the following conditional formula:
  • R3 represents the curvature radius of the object side surface of the second lens
  • R4 represents the curvature radius of the image side surface of the second lens
  • the optical lens may also satisfy the following conditional formula:
  • f represents the focal length of the optical lens
  • f3 represents the focal length of the third lens
  • CT3 represents the center thickness of the third lens
  • ET3 represents the edge thickness of the third lens
  • SAG5 i represents the sagittal height of any point on the object side of the third lens
  • SAG6 i represents the sagittal height of any point on the image side of the third lens.
  • the optical lens may also satisfy the following conditional formula:
  • f represents the focal length of the optical lens
  • f 123 represents the combined focal length of the first lens, the second lens and the third lens.
  • the optical lens may also satisfy the following conditional formula:
  • f represents the focal length of the optical lens
  • f 456 represents the combined focal length of the fourth lens
  • f4 represents the focal length of the fourth lens
  • f5 represents the focal length of the fifth lens
  • f6 represents the focal length of the sixth lens .
  • the optical lens may also satisfy the following conditional formula:
  • CT45 represents the separation distance between the fourth lens and the fifth lens on the optical axis
  • CT56 represents the separation distance between the fifth lens and the sixth lens on the optical axis
  • CT67 represents the distance between the sixth lens and the seventh lens on the optical axis interval distance.
  • the optical lens may also satisfy the following conditional formula:
  • f represents the focal length of the optical lens
  • f7 represents the focal length of the seventh lens
  • R13 represents the radius of curvature of the object side of the seventh lens
  • R14 represents the radius of curvature of the image side of the seventh lens.
  • the optical lens may also satisfy the following conditional formula:
  • CT7 represents the central thickness of the seventh lens
  • TTL represents the total optical length of the optical lens
  • SAG13 i represents the sag height of any point on the object side of the seventh lens
  • SAG14 i represents the sag height of any point on the image side of the seventh lens.
  • the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 may be aspherical lenses.
  • the above Lenses are made of plastic aspherical lenses. The use of aspherical lenses can effectively reduce the number of lenses, correct aberrations, and provide better optical performance.
  • the present invention will be further described below with a plurality of embodiments.
  • the thickness, radius of curvature, and material selection of each lens in the optical lens are different.
  • the following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not only limited by the following examples, and any other changes, substitutions, combinations or simplifications that do not deviate from the innovations of the present invention, All should be regarded as equivalent replacement modes, and all are included in the protection scope of the present invention.
  • each aspherical surface type of the optical lens may satisfy the following equation:
  • z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis
  • c is the paraxial curvature radius of the surface
  • k is the quadratic surface coefficient
  • a 2i is the 2i-order a Spherical coefficient.
  • the vertical distance between the inflection point of the object side S13 of the seventh lens and the optical axis is 1.935mm, and the sag relative to the center of the object side S13 of the seventh lens is 0.289mm.
  • the vertical distance between the inflection point of the image side S14 and the optical axis is 2.035 mm, and the sag relative to the center of the image side S14 of the seventh lens is 0.371 mm.
  • Table 2 shows the surface shape coefficients of each aspherical surface of the optical lens provided by the first embodiment of the present invention.
  • FIG. 2 , FIG. 3 , FIG. 4 and FIG. 5 are the field curvature graph, f- ⁇ distortion graph, vertical chromatic aberration graph, and axial chromatic aberration graph of the optical lens according to the first embodiment, respectively.
  • the field curvature curve in FIG. 2 represents the degree of curvature of the meridional image plane and the sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: degree). It can be seen from Figure 2 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ⁇ 0.05mm, indicating that the field curvature of the optical lens is well corrected.
  • the f-theta distortion curve in Figure 3 represents the distortion at different image heights on the imaging plane, the horizontal axis in the figure represents the f-theta distortion percentage, and the vertical axis represents the field angle (unit: degree). It can be seen from Figure 3 that the f- ⁇ distortion at different image heights on the imaging surface is controlled within 5%, and the shape increases linearly, indicating that the distortion of the optical lens is well corrected.
  • the vertical chromatic aberration curve in Figure 4 represents the chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane. Normalized field of view. It can be seen from Figure 4 that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ⁇ 3 ⁇ m, indicating that the vertical axis chromatic aberration of the optical lens is well corrected.
  • the axial chromatic aberration curve in FIG. 5 represents the aberration on the optical axis at the imaging plane, the vertical axis represents the nominal aperture (unit: ⁇ m), and the horizontal axis represents the normalized pupil radius (unit: mm). It can be seen from Figure 5 that the offset of the axial chromatic aberration is controlled within ⁇ 0.015mm, indicating that the optical lens can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.
  • the optical lens provided by the second embodiment of the present invention has substantially the same structure as the optical lens provided by the first embodiment, and the difference mainly lies in the curvature radius and material selection of each lens.
  • the vertical distance between the inflection point of the object side S13 of the seventh lens and the optical axis is 1.835mm, and the sag relative to the center of the object side S13 of the seventh lens is 0.251mm.
  • the vertical distance between the inflection point of the image side S14 and the optical axis is 1.955 mm, and the sag relative to the center of the image side S14 of the seventh lens is 0.336 mm.
  • Table 4 shows the surface shape coefficients of each aspherical surface of the optical lens provided by the second embodiment of the present invention.
  • FIG. 6 , FIG. 7 , FIG. 8 and FIG. 9 are the field curvature curve, f- ⁇ distortion curve, vertical chromatic aberration curve and axial chromatic aberration curve of the optical lens according to the second embodiment, respectively.
  • FIG. 6 shows the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from Figure 6 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ⁇ 0.05mm, indicating that the field curvature of the optical lens is well corrected.
  • Figure 7 shows the distortion at different image heights on the imaging plane. It can be seen from Figure 7 that the f- ⁇ distortion at different image heights on the imaging surface is controlled within 7%, and the shape increases linearly, indicating that the distortion of the optical lens is well corrected.
  • Fig. 8 shows the chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane. It can be seen from Figure 8 that the vertical chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ⁇ 3 ⁇ m, indicating that the vertical chromatic aberration of the optical lens is well corrected.
  • FIG. 9 shows aberrations on the optical axis at the imaging plane. It can be seen from Figure 9 that the offset of the axial chromatic aberration is controlled within ⁇ 0.02mm, indicating that the optical lens can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.
  • the optical lens provided by the third embodiment of the present invention has substantially the same structure as the optical lens provided by the first embodiment, and the difference mainly lies in the curvature radius and material selection of each lens.
  • the vertical distance between the inflection point of the object side S13 of the seventh lens and the optical axis is 1.795 mm, and the sag relative to the center of the object side S13 of the seventh lens is 0.217 mm.
  • the vertical distance between the inflection point of the image side S14 and the optical axis is 1.912 mm, and the sagittal height relative to the center of the image side S14 of the seventh lens is 0.298 mm.
  • Table 6 shows the surface shape coefficients of each aspherical surface of the optical lens in the third embodiment of the present invention.
  • FIG. 10 , FIG. 11 , FIG. 12 and FIG. 13 are the field curvature, f- ⁇ distortion, vertical chromatic aberration, and axial chromatic aberration of the optical lens according to the third embodiment, respectively.
  • FIG. 10 shows the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from Figure 10 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ⁇ 0.05mm, indicating that the field curvature of the optical lens is well corrected.
  • Figure 11 shows the distortion at different image heights on the imaging plane. It can be seen from Figure 11 that the f- ⁇ distortion at different image heights on the imaging surface is controlled within 6%, and the shape increases linearly, indicating that the distortion of the optical lens is well corrected.
  • FIG. 12 shows the chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane. It can be seen from Figure 12 that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ⁇ 3.0 ⁇ m, indicating that the vertical chromatic aberration of the optical lens is well corrected.
  • FIG. 13 shows aberrations on the optical axis at the imaging plane. It can be seen from Figure 13 that the offset of the axial chromatic aberration at the imaging plane is controlled within ⁇ 0.02mm, indicating that the optical lens can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.
  • the optical characteristics mainly include the focal length f of the optical lens, the aperture number F#, the entrance pupil diameter EPD, the optical total length TTL and the field of view angle FOV, as well as the relevant values corresponding to each of the aforementioned conditional expressions.
  • the optical lens provided by the present invention has the following advantages:
  • the field of view of the optical lens can reach 150°, which can effectively correct the optical distortion, control the f- ⁇ distortion to be less than 7%, and the shape increases linearly, which can meet the needs of large field of view and high-definition imaging.
  • the imaging element 210 may be a CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor) image sensor, or may be a CCD (Charge Coupled Device, charge coupled device) image sensor.
  • CMOS Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor
  • CCD Charge Coupled Device, charge coupled device
  • the imaging device 200 may be a smart phone, a Pad, or any other portable electronic device that is loaded with the above-mentioned optical lens.

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

L'invention concerne une lentille optique et un dispositif d'imagerie (200), la lentille optique comprenant en séquence le long de l'axe optique du côté objet au côté image (S17) : une première lentille (L1) avec une puissance focale négative, le côté objet (S1) de celle-ci étant convexe, et le côté image (S2) de celle-ci étant concave ; une deuxième lentille (L2) avec une puissance focale négative, le côté objet (S3) de celle-ci étant convexe, et le côté image (S4) de celle-ci étant concave ; une troisième lentille (L3) avec une puissance focale positive, le côté objet (S5) de celle-ci étant concave, et le côté image (S6) de celle-ci étant convexe ; une quatrième lentille (L4) avec une puissance focale positive, le côté objet (S7) et le côté image (S8) de celle-ci étant tous deux convexes ; une cinquième lentille (L5) avec une puissance focale positive, le côté objet (S9) de celle-ci étant concave, et le côté image (S10) de celle-ci étant convexe ; une sixième lentille (L6) avec une puissance focale négative, le côté objet (S11) et le côté image (S12) de celle-ci étant tous deux concaves ; et une septième lentille (L7) avec une puissance focale négative, le côté objet (S13) étant convexe au niveau de l'axe optique et le côté image (S14) étant concave au niveau de l'axe optique, le côté objet (S13) et le côté image (S14) de la septième lentille (L7) ayant tous deux au moins un point d'inflexion. La présente lentille optique permet de mieux obtenir un équilibre raisonnable entre un grand angle large, une miniaturisation et des pixels élevés, et peut améliorer efficacement l'expérience photographique de l'utilisateur.
PCT/CN2021/125793 2020-10-26 2021-10-22 Lentille optique et dispositif d'imagerie WO2022089327A1 (fr)

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CN114675405A (zh) * 2022-05-27 2022-06-28 江西联创电子有限公司 光学镜头
CN114879343A (zh) * 2022-05-08 2022-08-09 中山联拓光学有限公司 全景镜头及成像设备
CN117233938A (zh) * 2023-11-13 2023-12-15 江西联益光学有限公司 光学镜头
CN117930470A (zh) * 2024-03-22 2024-04-26 江西联益光学有限公司 光学镜头

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CN112034600B (zh) * 2020-10-26 2021-01-29 江西联益光学有限公司 光学镜头及成像设备
CN114137702A (zh) * 2021-12-08 2022-03-04 玉晶光电(厦门)有限公司 一种光学成像镜头
CN115576084B (zh) * 2022-12-09 2023-04-18 江西联创电子有限公司 光学镜头
CN116184640B (zh) * 2023-05-04 2023-09-12 江西联创电子有限公司 光学镜头

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CN117233938B (zh) * 2023-11-13 2024-02-20 江西联益光学有限公司 光学镜头
CN117930470A (zh) * 2024-03-22 2024-04-26 江西联益光学有限公司 光学镜头
CN117930470B (zh) * 2024-03-22 2024-06-11 江西联益光学有限公司 光学镜头

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