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WO2022222926A1 - Lentille optique et dispositif d'imagerie - Google Patents

Lentille optique et dispositif d'imagerie Download PDF

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Publication number
WO2022222926A1
WO2022222926A1 PCT/CN2022/087694 CN2022087694W WO2022222926A1 WO 2022222926 A1 WO2022222926 A1 WO 2022222926A1 CN 2022087694 W CN2022087694 W CN 2022087694W WO 2022222926 A1 WO2022222926 A1 WO 2022222926A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical
object side
optical lens
image side
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Application number
PCT/CN2022/087694
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English (en)
Chinese (zh)
Inventor
于笑枝
曾昊杰
刘绪明
Original Assignee
江西联益光学有限公司
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Filing date
Publication date
Application filed by 江西联益光学有限公司 filed Critical 江西联益光学有限公司
Publication of WO2022222926A1 publication Critical patent/WO2022222926A1/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 invention relates to the technical field of lens imaging, in particular to an optical lens and an imaging device.
  • the purpose of the present invention is to provide an optical lens and an imaging device, which at least have the advantages of small overall volume, overall length, and high pixels.
  • an embodiment of the present invention provides an optical lens, which sequentially includes from the object side to the image side along the optical axis: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens Lens, filter; wherein, the first lens has positive refractive power, its object side is convex, the image side is concave at the near optical axis and has at least one inflection point; the second lens has negative refractive power, its object The side is concave at the near optical axis and has at least one inflection point, and the image side is concave; the third lens has positive power, the object side is convex, and the image side is concave; the fourth lens has negative power, its The object side is concave and the image side is convex; the fifth lens has positive power, the object side is concave at the near optical axis, and the image side is convex; the sixth lens has negative power, and its object side is
  • an embodiment of the present invention further provides an imaging device, including 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 provided by the present invention adopts six lenses with specific refractive power, and adopts specific surface shape collocation and reasonable power distribution, so that the structure is more compact while satisfying high pixels, so that it is more compact.
  • the lens miniaturization and high pixel balance are well achieved.
  • FIG. 1 is a schematic structural diagram of an optical lens in a first embodiment of the present invention
  • Fig. 2 is the astigmatism curve diagram of the optical lens in the first embodiment of the present invention.
  • Fig. 3 is the distortion curve diagram of the optical lens in the first embodiment of the present invention.
  • Fig. 4 is the vertical axis chromatic aberration curve diagram of the optical lens in the first embodiment of the present invention.
  • Fig. 5 is the axial chromatic aberration curve diagram of the optical lens in the first embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an optical lens in a second embodiment of the present invention.
  • Fig. 8 is the distortion curve diagram of the optical lens in the second embodiment of the present invention.
  • FIG. 9 is a vertical-axis chromatic aberration curve diagram of an optical lens in a second embodiment of the present invention.
  • Fig. 10 is the axial chromatic aberration curve diagram of the optical lens in the second embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of an optical lens in a third embodiment of the present invention.
  • FIG. 13 is a distortion curve diagram of an optical lens in a third embodiment of the present invention.
  • FIG. 14 is a vertical-axis chromatic aberration curve diagram of an optical lens in a third embodiment of the present invention.
  • FIG. 1 a structural diagram of an optical lens 100 is provided for an embodiment of the present invention. From the object side to the image side along the optical axis, it includes: a diaphragm ST, a first lens L1, a second lens L2, a third lens Lens L3, fourth lens L4, fifth lens L5, sixth lens L6, filter G; wherein, the first lens L1 has positive refractive power, its object side S1 is convex, and the image side S2 is at the near optical axis.
  • the second lens L2 has negative refractive power, its object side S3 is concave at the near optical axis and has at least one inflection point, and the image side S4 is concave;
  • the third lens L3 has positive light Power, its object side S5 is convex at the near optical axis, and the image side S6 is concave;
  • the fourth lens L4 has negative refractive power, its object side S7 is concave, and the image side S8 is convex;
  • the fifth lens L5 has positive light Power, its object side S9 is concave at the near optical axis, and the image side S10 is convex;
  • the sixth lens L6 has negative refractive power, its object side S11 is concave at the near optical axis, and the image side S12 is at the near optical axis. is concave and has at least one inflection point.
  • the optical lens satisfies the following conditional formula:
  • TTL represents the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens
  • IH represents the actual half-image height of the optical lens on the imaging surface
  • f represents the optical lens Effective focal length. Satisfying the conditional formula (1), the effective focal length and the total optical length of the optical lens can be reasonably controlled, which is beneficial to realize the balance between the short total optical length and the high pixels of the optical lens.
  • the optical lens satisfies the following conditional formula:
  • R5 represents the curvature radius of the object side surface of the third lens
  • R6 represents the curvature radius of the image side surface of the third lens.
  • the shape of the third lens can be limited, which is beneficial to the molding of the third lens, and the degree of deflection of the light passing through the lens can be eased, which is beneficial to reduce aberrations.
  • R7 represents the radius of curvature of the object side of the fourth lens
  • R8 represents the radius of curvature of the image side of the fourth lens.
  • the shape of the fourth lens can be limited, which is beneficial to the molding of the third lens, and is beneficial to the correction of the aberration problem of the off-axis picture angle.
  • the optical lens satisfies the following conditional formula:
  • SAG3.1 represents the sag of the inflection point on the object side of the second lens
  • SAG3 represents the sag at the effective aperture on the object side of the second lens. Satisfying the conditional formula (4), the surface shape of the object side surface of the second lens can be reasonably controlled, which is beneficial to correct the distortion of the off-axis field of view and improve the resolution of the optical lens.
  • the optical lens satisfies the following conditional formula:
  • f represents the effective focal length of the optical lens
  • f1 represents the focal length of the first lens
  • f2 represents the effective focal length of the second lens
  • f3 represents the focal length of the third lens
  • f123 represents the first lens to the combined focal length of the third lens combination. Satisfying the conditional expressions (5), (6) and (7) can reasonably allocate the focal length of each lens, which is beneficial to reduce advanced aberrations, and at the same time, is beneficial to reduce the total optical length of the optical lens.
  • the optical lens satisfies the following conditional formula:
  • R5 represents the curvature radius of the object side surface of the third lens
  • R6 represents the curvature radius of the image side surface of the third lens.
  • the optical lens satisfies the following conditional formula:
  • SAG4 represents the sag height at the effective aperture on the image side of the second lens
  • SAG6 represents the sag height at the effective aperture on the image side of the third lens. Satisfying the conditional formula (9) can reasonably control the trend of light in the off-axis field of view, which is beneficial to reduce the aberration between the off-axis field of view and the central field of view, and improve the resolution quality of the optical lens.
  • the optical lens satisfies the following conditional formula:
  • R9 represents the radius of curvature of the object side of the fifth lens
  • R10 represents the radius of curvature of the image side of the fifth lens
  • f5 represents the focal length of the fifth lens. Satisfying the conditional expressions (10) and (11) enables the object side surface and the image side surface of the fifth lens to have curvature values in the same direction, which is beneficial for correcting the field curvature of the optical lens.
  • the optical lens satisfies the following conditional formula:
  • f3 represents the focal length of the third lens
  • f5 represents the focal length of the fifth lens
  • f6 represents the focal length of the sixth lens. Satisfying the conditional formula (12) can reasonably match the focal lengths of the third lens, the fifth lens and the sixth lens, which is beneficial to reduce the total optical length of the optical lens and realize the miniaturization of the system.
  • the optical lens satisfies the following conditional formula:
  • R11 represents the radius of curvature of the object side surface of the six lenses
  • R12 represents the radius of curvature of the image side surface of the sixth lens. Satisfying the conditional formula (13), the surface shape of the sixth lens can be reasonably controlled, which is beneficial to improve the matching degree of the optical lens and the sensor, and improve the resolution quality of the optical lens.
  • the optical lens satisfies the following conditional formula:
  • ET45 represents the separation distance between the fourth lens and the fifth lens parallel to the optical axis at the effective aperture
  • ET56 represents the fifth lens and the sixth lens parallel to the optical axis at the effective aperture
  • CT5 represents the center thickness of the fifth lens
  • CT45 represents the separation distance between the fourth lens and the fifth lens on the optical axis
  • CT56 represents the fifth lens and the sixth lens
  • TTL represents the distance from the object side of the first lens to the imaging surface on the optical axis.
  • the interval between the fourth lens and the sixth lens can be reasonably controlled, which is beneficial to reduce the sensitivity of the optical lens, and at the same time make the optical lens
  • the structure is more compact, which is beneficial to shorten the total length of the optical lens.
  • the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspherical lenses.
  • 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 of the surface
  • k is the quadratic surface coefficient
  • a 2i is the aspheric surface of order 2i face coefficient.
  • the thickness, radius of curvature, and material selection of each lens in the optical lens are different.
  • each lens in the optical lens 100 provided by the first embodiment of the present invention is shown in Table 1, where R represents the radius of curvature, d represents the optical surface distance, Nd represents the d-line refractive index of the material, and Vd represents the Abbe of the material number.
  • the vertical distance between the inflection point on the object side of the second lens L2 and the optical axis is 0.72 mm.
  • Reasonable control of the inflection point position can reduce ghost image energy and improve the resolution quality of the optical lens.
  • Table 2 shows the surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment.
  • FIG. 2 graphs of the astigmatism curve, optical distortion, vertical chromatic aberration and axial chromatic aberration of the optical lens 100 are shown in FIG. 2 , FIG. 3 , FIG. 4 and FIG. 5 , respectively.
  • FIG. 2 shows the astigmatism curve of the optical lens 100 in this embodiment, which indicates the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from the figure that the astigmatism of the image planes in the two directions is controlled at ⁇ 0.03mm It will be explained that the astigmatism correction of the optical lens 100 is good.
  • FIG. 3 shows the optical distortion curve of the optical lens 100 of this embodiment, which represents the distortion at different image heights on the imaging surface. It can be seen from the figure that the optical distortion is controlled within 2.0%, indicating that the distortion of the optical lens 100 is good 's correction.
  • FIG. 4 shows the vertical-axis chromatic aberration curve of the optical lens 100, which represents the chromatic aberration of the longest wavelength and the shortest wavelength at different image heights on the imaging plane. It can be seen from the figure that the vertical-axis chromatic aberration is controlled within ⁇ 1.0um.
  • the optical lens can effectively correct the aberrations of the fringe field of view and the secondary spectrum of the entire image plane.
  • FIG. 5 shows the axial chromatic aberration curve of the optical lens 100, which represents the aberration on the optical axis at the imaging surface. It can be seen from the figure that the offset of the axial chromatic aberration is controlled within ⁇ 0.03 mm, indicating that the optical lens 100 The axial chromatic aberration is well corrected.
  • the optical lens provided by the second embodiment of the present invention has substantially the same structure as the optical lens 100 in the first embodiment, and the difference lies in the curvature radius and material selection of each lens.
  • the vertical distance between the inflection point on the object side of the second lens L2 and the optical axis is 0.835mm.
  • Reasonably controlling the position of the inflection point can reduce ghost image energy and improve the resolution quality of the optical lens.
  • Table 4 shows the surface shape coefficients of each aspherical surface of the optical lens in this embodiment.
  • graphs of the astigmatism curve, optical distortion, vertical chromatic aberration and axial chromatic aberration of the optical lens 100 are shown in FIG. 6 , FIG. 7 , FIG. 8 and FIG. 9 , respectively.
  • FIG. 7 shows the astigmatism curve of the optical lens 100 in this embodiment. It can be seen from the figure that the astigmatism of the image planes in two directions is controlled within ⁇ 0.03 mm, indicating that the astigmatism of the optical lens 100 is well corrected.
  • FIG. 8 shows the optical distortion curve of the optical lens 100 of the present embodiment. It can be seen from the figure that the optical distortion is controlled within 2.0%, indicating that the distortion of the optical lens 100 is well corrected.
  • FIG. 9 shows the vertical-axis chromatic aberration curve of the optical lens 100. It can be seen from the figure that the vertical-axis chromatic aberration is controlled within ⁇ 1.5um, indicating that the optical lens can effectively correct the aberration of the edge field of view and the two grade spectrum.
  • FIG. 10 shows the axial chromatic aberration curve of the optical lens 100. It can be seen from the figure that the offset of the axial chromatic aberration is controlled within ⁇ 0.03 mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected.
  • the structure of the optical lens in the third embodiment of the present invention is basically the same as that of the optical lens 100 in the first embodiment, and the difference lies in the curvature radius and material selection of each lens.
  • the vertical distance between the inflection point on the object side of the second lens L2 and the optical axis is 0.915mm.
  • Reasonable control of the inflection point position can reduce ghost image energy and improve the resolution quality of the optical lens.
  • Table 6 shows the surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment.
  • the graphs of the astigmatism curve, optical distortion, vertical chromatic aberration and axial chromatic aberration of the optical lens 100 are shown in FIG. 12 , FIG. 13 , FIG. 14 and FIG. 15 , respectively.
  • FIG. 12 shows the astigmatism curve of the optical lens 100 in this embodiment. It can be seen from the figure that the astigmatism of the image surfaces in two directions is controlled within ⁇ 0.04mm, indicating that the astigmatism of the optical lens 100 is well corrected.
  • FIG. 13 shows the optical distortion curve of the optical lens 100 of the present embodiment. It can be seen from the figure that the optical distortion is controlled within 2.0%, indicating that the distortion of the optical lens 100 is well corrected.
  • FIG. 14 shows the vertical-axis chromatic aberration curve of the optical lens 100. It can be seen from the figure that the vertical-axis chromatic aberration is controlled within ⁇ 2.0um, indicating that the optical lens can effectively correct the aberration of the fringe field of view and the chromatic aberration of the entire image plane. grade spectrum.
  • FIG. 15 shows the axial chromatic aberration curve of the optical lens 100. It can be seen from the figure that the offset of the axial chromatic aberration is controlled within ⁇ 0.03 mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected.
  • Table 7 is the optical characteristics corresponding to the above three embodiments, mainly including the effective focal length f of the system, the aperture number F#, the entrance pupil diameter EPD, the optical total length TTL and the field of view angle 2 ⁇ , as well as the numerical values corresponding to each of the above conditional expressions.
  • Example Example 1 Example 2 Example 3 f(mm) 5.5020 5.5060 5.5080 F# 2.0 2.0 2.0 TTL(mm) 6.1 6.101 6.1 2 ⁇ (°) 85 85 85 EPD(mm) 2.6840 2.6860 2.6870 (TTL/IH)*f 6.5030 6.5078 6.5101 SAG3.1–SAG3 -0.0771 -0.0601 -0.0540 f1/f3 0.2299 0.2158 0.1809 (f2+f3)/f 1.8412 2.0639 2.8609 f123/f 1.0278 1.0486 1.0000 (R5+R6)/(R5-R6) -5.8087 -6.2421 -12.4808 (R7+R8)/(R7-R8) -9.7326 -8.0913 -6.4534 SAG4+SAG6 0.2220 0.1456 0.2055 R9/f5 -2.4009 -3.2486 -2.3243 R10/R9 0.1887 0.1434 0.1902 (f5-f6)/
  • the optical lens provided by the embodiment of the present invention has the following advantages:
  • the optical lens provided by the embodiment of the present invention has a relatively large aperture (F.no ⁇ 2.0) on the one hand due to the reasonable setting of the diaphragm and the shape of each lens, which meets the requirement of large aperture; on the other hand, the overall length of the lens is relatively long. Short and small in size, it can better meet the development trend of thin and light smartphones.
  • the field angle of the optical lens provided by the embodiment of the present invention can reach 85°, which can effectively correct optical distortion, control the distortion to be less than 2.0%, and can meet the needs of high-definition imaging with a large field angle.
  • An imaging device provided in this embodiment includes the optical lens and the imaging element in any of the foregoing embodiments.
  • the imaging element 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 may be a camera, a mobile terminal, or any other electronic device equipped with an optical lens
  • the mobile terminal may be a terminal device such as a smart phone, a smart tablet, and a smart reader.
  • the imaging device provided in this embodiment includes an optical lens. Since the optical lens has the advantages of small overall volume, wide viewing angle, high imaging quality, and high production yield, the imaging device has the advantages of low ghost image energy, wide viewing angle, high imaging quality, and high productivity. The advantage of high yield.

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

Abstract

La présente invention concerne une lentille optique et un dispositif d'imagerie. La lentille optique comprend, en séquence, du côté objet au côté image : une butée ; une première lentille qui a une puissance focale positive, la surface côté objet de celui-ci étant une surface convexe, et la surface côté image de celle-ci étant une surface concave à proximité de l'axe optique et ayant au moins un point d'inflexion ; une deuxième lentille qui a une puissance focale négative, la surface côté objet de celui-ci étant une surface concave à proximité de l'axe optique et ayant au moins un point d'inflexion, et la surface côté image de celle-ci étant une surface concave ; une troisième lentille qui a une puissance focale positive, la surface côté objet de celle-ci étant une surface convexe, et la surface côté image de celle-ci étant une surface concave ; une quatrième lentille qui a une puissance focale négative, la surface côté objet de celle-ci étant une surface concave, et la surface côté image de celle-ci étant une surface convexe ; une cinquième lentille qui a une puissance focale positive, la surface côté objet de celle-ci étant une surface concave à proximité de l'axe optique, et la surface côté image de celle-ci étant une surface convexe ; et une sixième lentille qui a une puissance focale négative, la surface côté objet de celle-ci étant une surface concave à proximité de l'axe optique, et la surface côté image de celle-ci étant une surface concave à proximité de l'axe optique et ayant au moins un point d'inflexion. Dans ladite lentille optique, le diamètre externe de la partie de tête de celle-ci est petit et la longueur totale de celle-ci est courte, ce qui peut mieux satisfaire la superficie et la miniaturisation du volume d'une lentille.
PCT/CN2022/087694 2021-04-20 2022-04-19 Lentille optique et dispositif d'imagerie WO2022222926A1 (fr)

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CN202110423092.4A CN112987262B (zh) 2021-04-20 2021-04-20 光学镜头及成像设备
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CN112987262B (zh) * 2021-04-20 2021-08-20 江西联益光学有限公司 光学镜头及成像设备
CN113253432B (zh) * 2021-06-29 2021-10-29 江西联益光学有限公司 光学镜头
CN113253437B (zh) * 2021-07-16 2021-10-29 江西联益光学有限公司 光学镜头
CN114326060B (zh) * 2022-03-07 2022-08-12 江西联益光学有限公司 光学镜头
CN114815154B (zh) * 2022-04-20 2023-08-08 江西晶超光学有限公司 光学镜头、摄像模组及电子设备

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CN211786334U (zh) * 2020-04-26 2020-10-27 天津欧菲光电有限公司 光学系统、摄像模组及电子设备
CN112987262A (zh) * 2021-04-20 2021-06-18 江西联益光学有限公司 光学镜头及成像设备

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CN104423017A (zh) * 2013-08-23 2015-03-18 大立光电股份有限公司 光学结像镜片组及取像装置
CN211786334U (zh) * 2020-04-26 2020-10-27 天津欧菲光电有限公司 光学系统、摄像模组及电子设备
CN111722368A (zh) * 2020-07-15 2020-09-29 浙江舜宇光学有限公司 光学成像镜头
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