WO2022061904A1 - Système optique, module de caméra et dispositif terminal - Google Patents

Système optique, module de caméra et dispositif terminal Download PDF

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Publication number
WO2022061904A1
WO2022061904A1 PCT/CN2020/118459 CN2020118459W WO2022061904A1 WO 2022061904 A1 WO2022061904 A1 WO 2022061904A1 CN 2020118459 W CN2020118459 W CN 2020118459W WO 2022061904 A1 WO2022061904 A1 WO 2022061904A1
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Prior art keywords
lens
optical system
optical axis
object side
focal length
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PCT/CN2020/118459
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English (en)
Chinese (zh)
Inventor
刘彬彬
邹海荣
李明
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欧菲光集团股份有限公司
南昌欧菲精密光学制品有限公司
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Priority to PCT/CN2020/118459 priority Critical patent/WO2022061904A1/fr
Publication of WO2022061904A1 publication Critical patent/WO2022061904A1/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
    • 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 belongs to the technical field of optical imaging, and in particular relates to an optical system, a camera module and a terminal device.
  • the size of the photographic optical system must be miniaturized under the market trend.
  • the improvement of semiconductor process technology has reduced the size of the pixel of the photosensitive element, so that higher pixel requirements can be achieved.
  • Embodiments of the present application provide an optical system, a camera module, and a terminal device, and the optical system simultaneously meets the requirements of high pixel, large aperture, and miniaturization.
  • an embodiment of the present application provides an optical system, the optical system includes a plurality of lenses, and the plurality of lenses includes from the object side (the object side refers to the side where light enters) to the image side (the image side is Refers to the side where the light exits) the first lenses arranged in sequence have positive refractive power, the object side of the first lens is convex at the near-optical axis, and the image side of the first lens is at the near-optical axis.
  • the second lens has a negative refractive power, the object side of the second lens is convex at the near-optical axis, and the image side of the second lens is concave at the near-optical axis;
  • the third lens has a negative refractive index
  • the fourth lens has a positive refractive power; the image side of the fourth lens is convex at the near optical axis;
  • the fifth lens has a negative refractive power;
  • the sixth lens has a positive refractive power, and the sixth lens
  • the object side of the lens is convex at the near optical axis, and the image side of the sixth lens is convex at the near optical axis;
  • the seventh lens has negative refractive power, and the object side of the seventh lens is at the near optical axis.
  • the image side of the seventh lens is concave at the near optical axis; the optical system satisfies the following conditional formula: 1 ⁇ (
  • the refractive power is the optical power, which represents the ability of the optical system to deflect light.
  • a positive refractive power means that the lens has a converging effect on the light beam, and a negative refractive power means that the lens has a divergent effect on the light beam.
  • the lens has no refractive power, that is, when the optical power is zero, it is plane refraction. At this time, the parallel beam along the axis is still a parallel beam along the axis after refraction, and no refractive phenomenon occurs.
  • This application reasonably configures the refractive power of the first lens to the seventh lens in the optical system and the surface shapes and definitions of the first lens, the second lens, the fourth lens, the sixth lens and the seventh lens (
  • the refractive power and thickness of the seventh lens in the vertical direction can be reasonably controlled, so as to avoid the seventh lens from being too thin and too thick, and reduce the impact of light on the imaging surface.
  • the angle of incidence reduces the sensitivity of the optical system.
  • the seventh lens is provided with a plurality of inflection points, which is beneficial to correct the distortion and field curvature generated by the first lens to the sixth lens, so that the configuration of the refractive power close to the imaging surface is relatively uniform.
  • the object side or the image side of at least one of the lenses is aspherical, which is beneficial for correcting aberrations of the optical system and improving the imaging quality of the optical system.
  • the optical system satisfies the conditional formula: f1>0mm, and f1 is the focal length of the first lens.
  • the first lens has a positive refractive power, which has a converging effect on the light beam. By limiting the value of f1, light with a large angle enters the first lens and can better converge the light.
  • the optical system satisfies the conditional formula:
  • it is beneficial to correct chromatic aberration and improve image quality.
  • the optical system satisfies the conditional formula: 0.5mm -1 ⁇ (n1+n2)/f ⁇ 1mm -1 , n1 is the refractive index of the first lens, and n2 is the refractive index of the second lens.
  • the refractive index, the reference wavelength of the refractive index is 587.6 nm, and f is the focal length of the optical system.
  • the optical system satisfies the conditional formula: f23 ⁇ 0mm, where f23 is the combined focal length of the second lens and the third lens.
  • f23 is the combined focal length of the second lens and the third lens.
  • the optical system satisfies the conditional formula: 0 ⁇ (CT1+CT2+CT3)/TTL ⁇ 0.5
  • CT1 is the thickness of the first lens on the optical axis
  • CT2 is the thickness of the second lens on the optical axis.
  • CT3 is the thickness of the third lens on the optical axis
  • TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis.
  • the optical system satisfies the conditional formula: (
  • the refractive powers of the second lens and the third lens are reasonably configured, which helps to reduce the comprehensive spherical aberration of the first lens, the second lens and the third lens , chromatic aberration and distortion are reduced to a reasonable position, reducing the design difficulty of the fourth lens, fifth lens, sixth lens and seventh lens; Improve the performance of the optical system.
  • the optical system satisfies the conditional formula: (f1+
  • Reasonable configuration of the size and refractive power of the first lens, the second lens and the third lens can avoid the large spherical aberration of the first lens, the second lens and the third lens, improve the overall resolution of the optical system, and at the same time, it is beneficial to the first lens, the second lens and the third lens
  • the size reduction of the lens, the second lens and the third lens helps to form a small size optical system.
  • the optical system satisfies the conditional formula: R62/f ⁇ -1, R62 is the radius of curvature of the image side surface of the sixth lens at the optical axis, and f is the focal length of the optical system.
  • R62/f the surface complexity of the sixth lens can be reduced, which is conducive to suppressing field curvature and distortion, reducing the difficulty of forming, and improving the overall image quality. too long.
  • the optical system satisfies the conditional formula:
  • the spherical aberration generated by the first lens to the fifth lens can be balanced, the overall resolution of the optical system can be improved, and the optical system can be controlled.
  • the configuration of the refractive power of the sixth lens and the seventh lens of the system corrects the aberration around the optical system, and at the same time facilitates size compression to form a small-sized optical system.
  • the optical system satisfies the conditional formula: 0 ⁇ R72/f ⁇ 1, R72 is the curvature radius of the image side surface of the seventh lens at the near optical axis, and f is the focal length of the optical system.
  • R72/f the surface complexity of the seventh lens can be reduced, which is conducive to suppressing field curvature and distortion, reducing the difficulty of forming, and improving the overall image quality. too long.
  • the optical system satisfies the conditional formula: 0 ⁇ Yc72/SD72 ⁇ 0.5
  • Yc72 is the off-axis vertex on the image side of the seventh lens (the vertex refers to a tangent at this point, and the tangent is vertical.
  • the vertical distance from the point on the optical axis) to the optical axis, SD72 is the maximum effective aperture of the image side surface of the seventh lens in the vertical axis direction.
  • the seventh lens is provided with a plurality of inflection points, which is beneficial to correct the distortion and field curvature generated by the first lens to the sixth lens, so that the configuration of the refractive power close to the imaging surface is relatively uniform.
  • the optical system satisfies the conditional formula: 0.6 ⁇ TTL/(ImgH*2) ⁇ 0.8, where TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis , ImgH is the image height corresponding to the maximum angle of view of the optical system.
  • TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis
  • ImgH is the image height corresponding to the maximum angle of view of the optical system.
  • the value of TTL/(ImgH*2) is limited within a small range, and through a reasonable structural layout, the characteristics of miniaturization of the optical system are realized.
  • the optical system satisfies the conditional formula: 38° ⁇ HFOV ⁇ 45°, and HFOV is half of the maximum angle of view of the optical system.
  • HFOV is half of the maximum angle of view of the optical system.
  • the optical system satisfies the conditional formula 0.75 ⁇ DL/TTL ⁇ 1, DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens, and TTL is the The distance on the optical axis from the object side of the first lens to the imaging plane in the optical system.
  • DL/TTL the distance between the seventh lens and the imaging surface is increased, which is beneficial to the reasonable structural layout of the optical system.
  • the optical system satisfies the conditional formula: 1.0 ⁇ TTL/f ⁇ 1.4, TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and f is the focal length of the optical system.
  • TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis
  • f is the focal length of the optical system.
  • the optical system satisfies the conditional formula: 1.5 ⁇ FNO ⁇ 2.0, where FNO is the aperture number of the optical system.
  • FNO is the aperture number of the optical system.
  • the present application provides a camera module, comprising a photosensitive element and the optical system according to any one of the foregoing embodiments, wherein the photosensitive element is located on the image side of the optical system.
  • the present application provides a terminal device, including the camera module.
  • the refractive power of the first lens to the seventh lens in the optical system and the surface shape and definition of the first lens, the second lens, the fourth lens, the sixth lens and the seventh lens (
  • FIG. 1 is a schematic structural diagram of an optical system provided by a first embodiment of the present application.
  • Fig. 2 is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment
  • FIG. 3 is a schematic structural diagram of an optical system provided by a second embodiment of the present application.
  • Fig. 4 is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment
  • FIG. 5 is a schematic structural diagram of an optical system provided by a third embodiment of the present application.
  • 6 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the third embodiment
  • FIG. 7 is a schematic structural diagram of an optical system provided by a fourth embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an optical system provided by a fifth embodiment of the present application.
  • FIG. 11 is a schematic diagram of the application of the optical system provided in the present application in a terminal device.
  • An optical system provided by the present application includes seven lenses, and the seven lenses are sequentially distributed from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. and the seventh lens.
  • the surface shape and refractive power of the seven lenses are as follows:
  • the first lens has positive refractive power, the object side of the first lens is convex at the near optical axis, the image side of the first lens is concave at the near optical axis;
  • the second lens has negative refractive power, the The object side of the second lens is convex at the near optical axis, and the image side of the second lens is concave at the near optical axis;
  • the third lens has a negative refractive power;
  • the fourth lens has a positive refractive power; the fourth lens has a positive refractive power;
  • the image side of the lens is convex at the near optical axis;
  • the fifth lens has negative refractive power;
  • the sixth lens has positive refractive power, the object side of the sixth lens is convex at the near optical axis, and the sixth lens has a positive refractive power.
  • the image side is convex at the near optical axis; the seventh lens has negative refractive power, the object side of the seventh lens is convex at the near optical axis, and the image side of the seventh lens is concave at the near optical axis.
  • the optical system satisfies the following conditional formula: 1 ⁇ (
  • SAG72 is the maximum distance on the optical axis from the off-axis point within the effective diameter of the image side of the seventh lens to the vertex on the axis of the image side of the seventh lens, CT7 is the thickness of the seventh lens on the optical axis.
  • the refractive power of the first lens to the seventh lens in the optical system and the surface shape and definition of the first lens, the second lens, the fourth lens, the sixth lens and the seventh lens (
  • the refractive power and thickness of the seventh lens in the vertical direction can be reasonably controlled, so as to avoid the seventh lens from being too thin and too thick, and reduce the impact of light on the imaging surface.
  • the angle of incidence reduces the sensitivity of the optical system.
  • the seventh lens is provided with a plurality of inflection points, which is beneficial to correct the distortion and field curvature generated by the first lens to the sixth lens, so that the configuration of the refractive power close to the imaging surface is relatively uniform.
  • the object side or image side of at least one of the lenses is aspherical, which is beneficial to correct the aberration of the optical system and improve the imaging quality of the optical system.
  • the optical system satisfies the conditional formula: f1>0mm, and f1 is the focal length of the first lens.
  • the first lens has a positive refractive power, which has a converging effect on the light beam. By limiting the value of f1, light with a large angle enters the first lens and can better converge the light.
  • the optical system satisfies the conditional formula:
  • it is beneficial to correct chromatic aberration and improve image quality.
  • the optical system satisfies the conditional formula: 0.5mm -1 ⁇ (n1+n2)/f ⁇ 1mm -1 , n1 is the refractive index of the first lens, and n2 is the refractive index of the second lens.
  • the refractive index, the reference wavelength of the refractive index is 587.6 nm, and f is the focal length of the optical system.
  • the optical system satisfies the conditional formula: f23 ⁇ 0mm, where f23 is the combined focal length of the second lens and the third lens.
  • f23 is the combined focal length of the second lens and the third lens.
  • the optical system satisfies the conditional formula: 0 ⁇ (CT1+CT2+CT3)/TTL ⁇ 0.5
  • CT1 is the thickness of the first lens on the optical axis
  • CT2 is the thickness of the second lens on the optical axis.
  • CT3 is the thickness of the third lens on the optical axis
  • TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis.
  • the optical system satisfies the conditional formula: (
  • the refractive powers of the second lens and the third lens are reasonably configured, which helps to reduce the comprehensive spherical aberration of the first lens, the second lens and the third lens , chromatic aberration and distortion are reduced to a reasonable position, reducing the design difficulty of the fourth lens, fifth lens, sixth lens and seventh lens; Improve the performance of the optical system.
  • the optical system satisfies the conditional formula: (f1+
  • Reasonable configuration of the size and refractive power of the first lens, the second lens and the third lens can avoid the large spherical aberration of the first lens, the second lens and the third lens, improve the overall resolution of the optical system, and at the same time, it is beneficial to the first lens, the second lens and the third lens
  • the size reduction of the lens, the second lens and the third lens helps to form a small size optical system.
  • the optical system satisfies the conditional formula: R62/f ⁇ -1, R62 is the radius of curvature of the image side surface of the sixth lens at the optical axis, and f is the focal length of the optical system.
  • R62/f the surface complexity of the sixth lens can be reduced, which is conducive to suppressing field curvature and distortion, reducing the difficulty of forming, and improving the overall image quality. too long.
  • the optical system satisfies the conditional formula:
  • the spherical aberration generated by the first lens to the fifth lens can be balanced, the overall resolution of the optical system can be improved, and the optical system can be controlled.
  • the configuration of the refractive power of the sixth lens and the seventh lens of the system corrects the aberration around the optical system, and at the same time facilitates size compression to form a small-sized optical system.
  • the optical system satisfies the conditional formula: 0 ⁇ R72/f ⁇ 1, R72 is the curvature radius of the image side surface of the seventh lens at the near optical axis, and f is the focal length of the optical system.
  • R72/f the surface complexity of the seventh lens can be reduced, which is conducive to suppressing field curvature and distortion, reducing the difficulty of forming, and improving the overall image quality. too long.
  • the optical system satisfies the conditional formula: 0 ⁇ Yc72/SD72 ⁇ 0.5
  • Yc72 is the vertical distance from the off-axis vertex on the image side of the seventh lens to the optical axis
  • SD72 is the seventh lens.
  • the maximum effective aperture of the image side of the lens in the vertical axis direction By limiting the range of Yc72/SD72, the refractive power and thickness of the seventh lens in the vertical direction can be reasonably controlled, avoiding the seventh lens being too thin and too thick, reducing the incident angle of light on the imaging plane, and reducing the sensitivity of the optical system.
  • the seventh lens is provided with a plurality of inflection points, which is beneficial to correct the distortion and field curvature generated by the first lens to the sixth lens, so that the configuration of the refractive power close to the imaging surface is relatively uniform.
  • the optical system satisfies the conditional formula: 0.6 ⁇ TTL/(ImgH*2) ⁇ 0.8, where TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis , ImgH is the image height corresponding to the maximum angle of view of the optical system.
  • TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis
  • ImgH is the image height corresponding to the maximum angle of view of the optical system.
  • the value of TTL/(ImgH*2) is limited within a small range, and through a reasonable structural layout, the characteristics of miniaturization of the optical system are realized.
  • the optical system satisfies the conditional formula: 38° ⁇ HFOV ⁇ 45°, and HFOV is half of the maximum angle of view of the optical system.
  • HFOV is half of the maximum angle of view of the optical system.
  • the optical system satisfies the conditional formula 0.75 ⁇ DL/TTL ⁇ 1, DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens, and TTL is the The distance on the optical axis from the object side of the first lens to the imaging plane in the optical system.
  • DL/TTL the distance between the seventh lens and the imaging surface is increased, which is beneficial to the reasonable structural layout of the optical system.
  • the optical system satisfies the conditional formula: 1.0 ⁇ TTL/f ⁇ 1.4, TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis, and f is the focal length of the optical system.
  • TTL is the distance from the object side of the first lens in the optical system to the imaging surface on the optical axis
  • f is the focal length of the optical system.
  • the optical system satisfies the conditional formula: 1.5 ⁇ FNO ⁇ 2.0, where FNO is the aperture number of the optical system.
  • FNO is the aperture number of the optical system.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the seventh lens L7 away from the sixth lens L6 is the image side 13 .
  • from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lens L6, seventh lens L7, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic material, its object side S1 is convex at the near optical axis and at the circumference, its image side S2 is concave at the near optical axis, and its image side S2 is at the circumference. Convex, and both are aspherical.
  • the second lens L2 has a negative refractive power and is made of plastic material, and its object side S3 is convex at the near optical axis and at the circumference, and its image side S4 is concave at the near optical axis and at the circumference, and both are non- spherical.
  • the third lens L3 has a negative refractive power and is made of plastic material. Its object side S5 is convex at the near optical axis, its object side S5 is concave at the circumference, and its image side S6 is concave at the near optical axis. The side surface S6 is convex at the circumference, and all are aspherical.
  • the fourth lens L4 has a positive refractive power and is a plastic material, its object side S7 is a concave surface at the near optical axis, its object side S7 is a convex surface at the circumference, and its image side S8 is at the near optical axis and at the circumference. Convex, and all are aspheric.
  • the fifth lens L5 has a negative refractive power and is made of plastic material, its object side S9 is convex at the near optical axis, its object side S9 is concave at the circumference, its image side S10 is concave at the near optical axis, and its image is concave at the near optical axis.
  • the side surface S10 is convex at the circumference, and all are aspherical.
  • the sixth lens L6 has a positive refractive power and is made of plastic material. Its object side S11 is convex at the near optical axis, its object side S11 is concave at the circumference, and its image side S12 is at the near optical axis and at the circumference. Convex, and both are aspherical.
  • the seventh lens L7 has a negative refractive power and is made of plastic material. Its object side S13 is convex at the near optical axis, its object side S13 is concave at the circumference, and its image side S14 is concave at the near optical axis, and its image is concave at the near optical axis.
  • the side surface S14 is convex at the circumference, and all are aspherical.
  • the diaphragm STO may be located on the object side of the first lens L1 or between any two adjacent lenses, and the diaphragm STO in this embodiment is disposed on the object side of the first lens L1.
  • the infrared filter element IRCF is arranged after the seventh lens L7, including the object side S15 and the image side S16.
  • the infrared filter element IRCF is used to filter out infrared light, so that the light entering the imaging surface is visible light, and the wavelength of visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging surface S17 is the surface where the image formed by the light of the subject passing through the optical system is located.
  • Table 1a shows the characteristic table of the optical system of this embodiment, wherein the curvature radius in this embodiment is the curvature radius of each lens at the near optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field of view of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • ImgH is The image height corresponding to the maximum angle of view of the optical system
  • DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens.
  • the combined focal length f23 of the second lens L2 and the third lens L3 is -13.0277 mm
  • the combined focal length f34 of the third lens L3 and the fourth lens L4 is 31.7286 mm
  • the combined focal length f45 of the fourth lens L4 and the fifth lens L5 is 31.5062 mm
  • the combined focal length f56 of the fifth lens L5 and the sixth lens L6 is 9.1374 mm
  • the combined focal length f67 of the sixth lens L6 and the seventh lens L7 is -11.1171 mm.
  • the object side or the image side of at least one of the first lens L1 to the seventh lens L7 is aspherical, and the surface type of each aspherical lens can be defined by but not limited to the following aspherical formula:
  • Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex
  • r is the distance from the corresponding point on the aspheric surface to the optical axis
  • c is the curvature of the aspheric vertex
  • k is the conic constant
  • Ai is the aspheric surface formula The coefficients corresponding to the higher-order terms of the i-th term in .
  • Table 1b shows the high-order term coefficients A4, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 that can be used for the aspheric mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 in the first embodiment.
  • FIG. 2 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the first embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system
  • the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm
  • the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm
  • the distortion curve represents the distortion value corresponding to different field angles.
  • the reference wavelength is 555.0000nm.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the seventh lens L7 away from the sixth lens L6 is the image side 13 .
  • from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lens L6, seventh lens L7, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic material, its object side S1 is convex at the near optical axis and at the circumference, its image side S2 is concave at the near optical axis, and its image side S2 is at the circumference. Convex, and both are aspherical.
  • the second lens L2 has a negative refractive power and is made of plastic material, the object side S3 is convex at the near optical axis and the circumference, and the image side S4 is concave at the near optical axis and the circumference, and both are non- spherical.
  • the third lens L3 has negative refractive power and is made of plastic material, its object side S5 is concave at the near optical axis and at the circumference, and its image side S6 is convex at the near optical axis and at the circumference, and both are non- spherical.
  • the fourth lens L4 has a positive refractive power and is a plastic material, its object side S7 is a concave surface at the near optical axis, its object side S7 is a convex surface at the circumference, and its image side S8 is at the near optical axis and at the circumference. Convex, and all are aspheric.
  • the fifth lens L5 has a negative refractive power and is made of plastic material, its object side S9 is convex at the near optical axis, its object side S9 is concave at the circumference, its image side S10 is concave at the near optical axis, and its image is concave at the near optical axis.
  • the side surface S10 is convex at the circumference, and all are aspherical.
  • the sixth lens L6 has a positive refractive power and is made of plastic material. Its object side S11 is convex at the near optical axis, its object side S11 is concave at the circumference, and its image side S12 is at the near optical axis and at the circumference. Convex, and both are aspherical.
  • the seventh lens L7 has a negative refractive power and is made of plastic material. Its object side S13 is convex at the near optical axis, its object side S13 is concave at the circumference, and its image side S14 is concave at the near optical axis, and its image is concave at the near optical axis.
  • the side surface S14 is convex at the circumference, and all are aspherical.
  • the diaphragm STO may be located on the object side of the first lens L1 or between any two adjacent lenses, and the diaphragm STO in this embodiment is arranged on the object side of the first lens L1.
  • the infrared filter element IRCF is arranged after the seventh lens L7, including the object side S15 and the image side S16.
  • the infrared filter element IRCF is used to filter out infrared light, so that the light entering the imaging surface is visible light, and the wavelength of visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging plane S17 is the plane where the image formed by the light of the subject passing through the optical system is located.
  • Table 2a shows the characteristic table of the optical system of this embodiment, wherein the curvature radius in this embodiment is the curvature radius of each lens at the near optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field of view of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • ImgH is The image height corresponding to the maximum angle of view of the optical system
  • DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens.
  • the combined focal length f23 of the second lens L2 and the third lens L3 is -16.4058 mm
  • the combined focal length f34 of the third lens L3 and the fourth lens L4 is 22.9984 mm
  • the combined focal length f45 of the fourth lens L4 and the fifth lens L5 It is 24.1886mm
  • the combined focal length f56 of the fifth lens L5 and the sixth lens L6 is 9.2549mm
  • the combined focal length f67 of the sixth lens L6 and the seventh lens L7 is -11.4932mm.
  • Table 2b shows the high-order term coefficients A4, S1, S13, S14 that can be used for each aspherical mirror surface S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14 in the second embodiment.
  • FIG. 4 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the second embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system
  • the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm
  • the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm
  • the distortion curve represents the distortion value corresponding to different field angles.
  • the reference wavelength is 555.0000nm.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the seventh lens L7 away from the sixth lens L6 is the image side 13 .
  • from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lens L6, seventh lens L7, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic material, and its object side S1 is convex at the near optical axis and at the circumference, and its image side S2 is concave at the near optical axis and at the circumference, and both are non-concave. spherical.
  • the second lens L2 has a negative refractive power and is made of plastic material, the object side S3 is convex at the near optical axis and the circumference, and the image side S4 is concave at the near optical axis and the circumference, and both are non- spherical.
  • the third lens L3 has negative refractive power and is made of plastic material, its object side S5 is concave at the near optical axis and at the circumference, and its image side S6 is convex at the near optical axis and at the circumference, and both are non- spherical.
  • the fourth lens L4 has a positive refractive power and is a plastic material, its object side S7 is a concave surface at the near optical axis, its object side S7 is a convex surface at the circumference, and its image side S8 is at the near optical axis and at the circumference. Convex, and all are aspheric.
  • the fifth lens L5 has a negative refractive power and is made of plastic material, its object side S9 is concave at the near optical axis and at the circumference, its image side S10 is concave at the near optical axis, and its image side S10 is at the circumference. Convex, and both are aspherical.
  • the sixth lens L6 has a positive refractive power and is made of plastic material. Its object side S11 is convex at the near optical axis, its object side S11 is concave at the circumference, and its image side S12 is at the near optical axis and at the circumference. Convex, and both are aspherical.
  • the seventh lens L7 has a negative refractive power and is made of plastic material, its object side S13 is convex at the near optical axis and at the circumference, its image side S14 is concave at the near optical axis, and its image side S14 is at the circumference. Convex, and both are aspherical.
  • the infrared filter element IRCF is arranged after the seventh lens L7, including the object side S15 and the image side S16.
  • the infrared filter element IRCF is used to filter out infrared light, so that the light entering the imaging surface is visible light, and the wavelength of visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging plane S17 is the plane where the image formed by the light of the subject passing through the optical system is located.
  • Table 3a shows the characteristic table of the optical system of this embodiment, wherein the curvature radius in this embodiment is the curvature radius of each lens at the near optical axis.
  • A20 -0.014165 -0.031089 -0.058914 -0.035968 1.008215 0.470209 0.267613 face number S8 S9 S10 S11 S12 S13 S14 K 40.616220 -99.000000 99.000000 -9.098781 4.771686 -10.057682 -4.527319 A4 0.039368 0.044418 0.078874 0.240739 0.044798 -0.272773 -0.135757 A6 -0.318870 -0.454137 -0.524604 -0.474546 0.174724 0.188297 0.076390 A8 0.796828 1.138384 0.940841 0.581053 -0.290678 -0.120894 -0.033845 A10 -1.629426 -1.950191 -1.091663 -0.544998 0.200959 0.056780 0.009058 A12 2.354874 2.213735 0.847588 0.343518 -0.080539 -0.0166
  • FIG. 6 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the third embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system
  • the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm
  • the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm
  • the distortion curve represents the distortion value corresponding to different field angles.
  • the reference wavelength is 555.0000nm.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the seventh lens L7 away from the sixth lens L6 is the image side 13 .
  • from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lens L6, seventh lens L7, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic material, and its object side S1 is convex at the near optical axis and at the circumference, and its image side S2 is concave at the near optical axis and at the circumference, and both are non-concave. spherical.
  • the second lens L2 has a negative refractive power and is made of plastic material, the object side S3 is convex at the near optical axis and the circumference, and the image side S4 is concave at the near optical axis and the circumference, and both are non- spherical.
  • the third lens L3 has negative refractive power and is made of plastic material, its object side S5 is concave at the near optical axis and at the circumference, and its image side S6 is convex at the near optical axis and at the circumference, and both are non- spherical.
  • the fourth lens L4 has a positive refractive power and is a plastic material, and its object side surface S7 is convex at the near optical axis and at the circumference, and its image side S8 is convex at the near optical axis and at the circumference, and both are non-convex. spherical.
  • the fifth lens L5 has a negative refractive power and is made of plastic material, and its object side surface S9 is concave at the near optical axis and at the circumference, and its image side S10 is convex at the near optical axis and at the circumference, and both are non-concave. spherical.
  • the sixth lens L6 has a positive refractive power and is made of plastic material. Its object side S11 is convex at the near optical axis, its object side S11 is concave at the circumference, and its image side S12 is at the near optical axis and at the circumference. Convex, and both are aspherical.
  • the seventh lens L7 has a negative refractive power and is made of plastic material, its object side S13 is convex at the near optical axis and at the circumference, its image side S14 is concave at the near optical axis, and its image side S14 is at the circumference. Convex, and both are aspherical.
  • the diaphragm STO may be located on the object side of the first lens L1 or between any two adjacent lenses, and the diaphragm STO in this embodiment is arranged on the object side of the first lens L1.
  • the infrared filter element IRCF is arranged after the seventh lens L7, including the object side S15 and the image side S16.
  • the infrared filter element IRCF is used to filter out infrared light, so that the light entering the imaging surface is visible light, and the wavelength of visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging plane S17 is the plane where the image formed by the light of the subject passing through the optical system is located.
  • Table 4a shows the characteristic table of the optical system of this embodiment, wherein the curvature radius in this embodiment is the curvature radius of each lens at the near optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field of view of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • ImgH is The image height corresponding to the maximum angle of view of the optical system
  • DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens.
  • the combined focal length f23 of the second lens L2 and the third lens L3 is -30.1658 mm
  • the combined focal length f34 of the third lens L3 and the fourth lens L4 is 17.6302 mm
  • the combined focal length f45 of the fourth lens L4 and the fifth lens L5 is 18.1426mm
  • the combined focal length f56 of the fifth lens L5 and the sixth lens L6 is 8.1268mm
  • the combined focal length f67 of the sixth lens L6 and the seventh lens L7 is -244.9808mm.
  • Table 4b shows the high-order term coefficients A4, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 that can be used for the aspheric mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 in the fourth embodiment.
  • A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.
  • FIG. 8 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the fourth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system
  • the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm
  • the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm
  • the distortion curve represents the distortion value corresponding to different field angles.
  • the reference wavelength is 555.0000nm.
  • the straight line 11 represents the optical axis
  • the side of the first lens L1 away from the second lens L2 is the object side 12
  • the side of the seventh lens L7 away from the sixth lens L6 is the image side 13 .
  • from the object side 12 to the image side 13 are the diaphragm STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the Six lens L6, seventh lens L7, infrared filter element IRCF.
  • the first lens L1 has a positive refractive power and is made of plastic material, its object side S1 is convex at the near optical axis and at the circumference, its image side S2 is concave at the near optical axis, and its image side S2 is at the circumference. Convex, and both are aspherical.
  • the second lens L2 has a negative refractive power and is made of plastic material, the object side S3 is convex at the near optical axis and the circumference, and the image side S4 is concave at the near optical axis and the circumference, and both are non- spherical.
  • the third lens L3 has negative refractive power and is made of plastic material, its object side S5 is concave at the near optical axis and at the circumference, and its image side S6 is convex at the near optical axis and at the circumference, and both are non- spherical.
  • the fourth lens L4 has a positive refractive power and is a plastic material, and its object side surface S7 is convex at the near optical axis and at the circumference, and its image side S8 is convex at the near optical axis and at the circumference, and both are non-convex. spherical.
  • the fifth lens L5 has a negative refractive power and is made of plastic material, and its object side surface S9 is concave at the near optical axis and at the circumference, and its image side S10 is convex at the near optical axis and at the circumference, and both are non-concave. spherical.
  • the sixth lens L6 has a positive refractive power and is made of plastic material. Its object side S11 is convex at the near optical axis, its object side S11 is concave at the circumference, and its image side S12 is at the near optical axis and at the circumference. Convex, and both are aspherical.
  • the seventh lens L7 has a negative refractive power and is made of plastic material. Its object side S13 is convex at the near optical axis, its object side S13 is concave at the circumference, and its image side S14 is concave at the near optical axis, and its image is concave at the near optical axis.
  • the side surface S14 is convex at the circumference, and all are aspherical.
  • the diaphragm STO may be located on the object side of the first lens L1 or between any two adjacent lenses, and the diaphragm STO in this embodiment is arranged on the object side of the first lens L1.
  • the infrared filter element IRCF is arranged after the seventh lens L7, including the object side S15 and the image side S16.
  • the infrared filter element IRCF is used to filter out infrared light, so that the light entering the imaging surface is visible light, and the wavelength of visible light is 380nm- 780nm, the material of the infrared filter element IRCF is glass.
  • the imaging plane S17 is the plane where the image formed by the light of the subject passing through the optical system is located.
  • Table 5a shows the characteristic table of the optical system of this embodiment, wherein the curvature radius in this embodiment is the curvature radius of each lens at the near optical axis.
  • f is the focal length of the optical system
  • FNO is the aperture number of the optical system
  • FOV is the maximum field of view of the optical system
  • TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis
  • ImgH is The image height corresponding to the maximum angle of view of the optical system
  • DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens.
  • the combined focal length f23 of the second lens L2 and the third lens L3 is -15.1853 mm
  • the combined focal length f34 of the third lens L3 and the fourth lens L4 is 18.8297 mm
  • the combined focal length f45 of the fourth lens L4 and the fifth lens L5 is 24.4426mm
  • the combined focal length f56 of the fifth lens L5 and the sixth lens L6 is 10.3997mm
  • the combined focal length f67 of the sixth lens L6 and the seventh lens L7 is -12.1354mm.
  • Table 5b shows the high-order term coefficients A4, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 that can be used for the aspherical mirror surfaces S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 in the fifth embodiment.
  • A6, A8, A10, A12, A14, A16, A18 and A20, wherein each aspherical surface type can be defined by the formula given in the first embodiment.
  • FIG. 10 shows longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical system of the fifth embodiment.
  • the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system
  • the reference wavelengths of the longitudinal spherical aberration curve are 650.0000nm, 610.0000nm, 555.0000nm, 510.0000nm, 470.0000nm
  • the astigmatism curve represents Meridional image surface curvature and sagittal image surface curvature, where S represents the sagittal direction, T represents the meridional direction, and the reference wavelength of the astigmatism curve is 555.0000 nm
  • the distortion curve represents the distortion value corresponding to different field angles.
  • the reference wavelength is 555.0000nm.
  • Table 6 shows the TTL/(ImgH*2), HFOV, DL/TTL, TTL/f, f1, f23, R72/f,
  • each embodiment can satisfy: 0.6 ⁇ TTL/(ImgH*2) ⁇ 0.8, 38° ⁇ HFOV ⁇ 45°, 0.75 ⁇ DL/TTL ⁇ 1, 1.0 ⁇ TTL/f ⁇ 1.4, f1> 0mm, f23 ⁇ 0mm, 0 ⁇ R72/f ⁇ 1,
  • the optical system involved in the present application is applied to the camera module 20 in the terminal device 30 .
  • the terminal device 30 may be a mobile phone, a tablet computer, a drone, a computer, or other devices.
  • the photosensitive element of the camera module 20 is located on the image side of the optical system, and the camera module 20 is assembled inside the terminal device 30 .
  • the present application provides a camera module, including a photosensitive element and the optical system provided by the embodiments of the present application.
  • the photosensitive element is located on the image side of the optical system, and is used to pass through the first lens to the seventh lens and be incident on the electronic photosensitive element. The light is converted into an electrical signal of the image.
  • the electronic photosensitive element can be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD).
  • CMOS Complementary Metal Oxide Semiconductor
  • CCD Charge-coupled Device
  • the present application further provides a terminal device, where the terminal device includes the camera module provided by the embodiment of the present application.
  • the terminal device may be a mobile phone, a tablet computer, a drone, a computer, and the like.

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

Abstract

Sont divulgués dans des modes de réalisation de la présente invention un système optique, un module de caméra et un dispositif terminal. Le système optique comprend une première lentille ayant une réfringence positive, une surface côté objet de la première lentille étant convexe au niveau d'un axe optique proche, et une surface côté image de la première lentille étant concave au niveau de l'axe optique proche ; une deuxième lentille, une troisième lentille, une cinquième lentille et une septième lentille ayant une réfringence négative ; et une quatrième lentille et une sixième lentille ayant une réfringence positive. Le système optique satisfait la relation 11<(|SAG71|+SAG72)/CT7<1,5. Selon la présente invention, le réglage raisonnable de la réfringence et des types de surface de la première lentille à la septième lentille et la définition (|SAG71|+SAG72)/CT7 permettent au système optique de satisfaire toutes les exigences d'un pixel élevé, d'une grande ouverture et d'une miniaturisation.
PCT/CN2020/118459 2020-09-28 2020-09-28 Système optique, module de caméra et dispositif terminal WO2022061904A1 (fr)

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CN114690378A (zh) * 2022-06-02 2022-07-01 江西晶超光学有限公司 一种光学成像系统、镜头模组及电子设备
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