WO2021127859A1 - Lentille optique de capture d'image - Google Patents

Lentille optique de capture d'image Download PDF

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Publication number
WO2021127859A1
WO2021127859A1 PCT/CN2019/127483 CN2019127483W WO2021127859A1 WO 2021127859 A1 WO2021127859 A1 WO 2021127859A1 CN 2019127483 W CN2019127483 W CN 2019127483W WO 2021127859 A1 WO2021127859 A1 WO 2021127859A1
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Prior art keywords
lens
curvature
radius
imaging optical
ttl
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PCT/CN2019/127483
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English (en)
Chinese (zh)
Inventor
孙雯
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诚瑞光学(常州)股份有限公司
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Priority to PCT/CN2019/127483 priority Critical patent/WO2021127859A1/fr
Publication of WO2021127859A1 publication Critical patent/WO2021127859A1/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
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.
  • the photosensitive devices of general photographic lenses are nothing more than photosensitive coupled devices (CCD) or complementary metal oxide semiconductor devices (Complementary Metal).
  • CCD photosensitive coupled devices
  • CMOS Sensor complementary metal oxide semiconductor devices
  • the pixel size of photosensitive devices has been reduced, and the development trend of current electronic products with good functions, thin and short appearance, therefore, has The miniaturized camera lens with good image quality has become the mainstream in the current market.
  • the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element or four-element lens structure.
  • the object of the present invention is to provide an imaging optical lens that can meet the requirements of ultra-thin and wide-angle while obtaining high imaging performance.
  • the embodiments of the present invention provide an imaging optical lens.
  • the imaging optical lens includes a first lens, a second lens, a third lens, and a fourth lens in order from the object side to the image side.
  • the focal length of the imaging optical lens is f
  • the focal length of the first lens is f1
  • the focal length of the second lens is f2
  • the radius of curvature of the object side surface of the third lens is R5
  • the third lens image side The radius of curvature of is R6, the on-axis thickness of the second lens is d3, the on-axis distance from the image side of the second lens to the object side of the third lens is d4, and the following relationship is satisfied:
  • the focal length of the third lens is f3, and satisfies the following relationship:
  • the curvature radius of the object side surface of the first lens is R1
  • the curvature radius of the image side surface of the first lens is R2
  • the axial thickness of the first lens is d1
  • the total optical length of the imaging optical lens It is TTL and satisfies the following relationship:
  • the focal length of the second lens is f2
  • the radius of curvature of the object side of the second lens is R3
  • the radius of curvature of the image side of the second lens is R4
  • the on-axis thickness of the second lens is d3
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the focal length of the fourth lens is f4
  • the radius of curvature of the object side of the fourth lens is R7
  • the radius of curvature of the image side of the fourth lens is R8,
  • the total optical length of the imaging optical lens is TTL
  • the focal length of the fifth lens is f5
  • the radius of curvature of the object side of the fifth lens is R9
  • the radius of curvature of the image side of the fifth lens is R10
  • the on-axis thickness of the fifth lens is d9
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the focal length of the sixth lens is f6, the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, and the on-axis thickness of the sixth lens is d11, the total optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the focal length of the seventh lens is f7
  • the radius of curvature of the object side of the seventh lens is R13
  • the radius of curvature of the image side of the seventh lens is R14
  • the on-axis thickness of the seventh lens is d13
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the focal length of the eighth lens is f8
  • the radius of curvature of the object side of the eighth lens is R15
  • the radius of curvature of the image side of the eighth lens is R16
  • the on-axis thickness of the eighth lens is d15
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the aperture F number FNO of the imaging optical lens is less than or equal to 1.95.
  • the beneficial effect of the present invention is that the imaging optical lens according to the present invention has excellent optical characteristics, meets the requirements of large aperture, ultra-thin and wide-angle, and is especially suitable for mobile phones composed of high-pixel CCD, CMOS and other imaging elements. Camera lens assembly and WEB camera lens.
  • FIG. 1 is a schematic diagram of the structure of an imaging optical lens according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 1;
  • FIG. 3 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 1;
  • FIG. 4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 1;
  • FIG. 5 is a schematic diagram of the structure of an imaging optical lens according to a second embodiment of the present invention.
  • FIG. 6 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 5;
  • FIG. 7 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 5;
  • FIG. 8 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 5;
  • FIG. 9 is a schematic diagram of the structure of an imaging optical lens according to a third embodiment of the present invention.
  • FIG. 10 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 9;
  • FIG. 11 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 9;
  • FIG. 12 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 9.
  • FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
  • the imaging optical lens 10 includes eight lenses. Specifically, the imaging optical lens 10 includes in order from the object side to the image side: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens. Lens L6, seventh lens L7, and eighth lens L8.
  • An optical element such as an optical filter GF may be provided between the eighth lens L8 and the image plane Si.
  • the focal length of the overall imaging optical lens 10 as f
  • the focal length of the first lens L1 as f1
  • 1.05 ⁇ f1/f ⁇ 1.90 stipulates the ratio of the focal length of the first lens L1 to the total focal length, which helps to reduce the system within the range of conditions Total length.
  • 1.06 ⁇ f1/f ⁇ 1.89 is satisfied.
  • the focal length of the second lens L2 is defined as f2, f2 ⁇ 0, and the focal length of the second lens L2 is specified, which helps correct system aberrations and improve the imaging quality.
  • the curvature radius of the object side surface of the third lens L3 is R5, and the curvature radius of the image side surface of the third lens L3 is R6, -15.00 ⁇ (R5+R6)/(R5-R6) ⁇ -1.80, which specifies the third lens L3
  • the shape helps reduce the degree of light deflection and reduce aberrations.
  • -14.87 ⁇ (R5+R6)/(R5-R6) ⁇ -1.81 is satisfied.
  • the on-axis thickness of the second lens L2 as d3, and the on-axis distance from the image side of the second lens L2 to the object side of the third lens L3 is d4, 2.50 ⁇ d3/d4 ⁇ 8.00, which is helpful for the lens within the conditions Processing and lens assembly.
  • d3 the on-axis thickness of the second lens L2
  • d4 2.50 ⁇ d3/d4 ⁇ 8.00, which is helpful for the lens within the conditions Processing and lens assembly.
  • 2.54 ⁇ d3/d4 ⁇ 7.97 is satisfied.
  • the imaging optical lens 10 can be made to have high performance and meet low TTL.
  • TTL is the total optical length of the camera optical lens 10, that is, the on-axis distance from the object side of the first lens L1 to the imaging surface, and the unit is mm.
  • the focal length of the third lens L3 is defined as f3, 1.00 ⁇ f3/f ⁇ 10.00, and the ratio of the focal length of the third lens L3 to the total focal length is stipulated, which helps aberration correction within the conditional range and improves the image quality of the image plane.
  • the curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfying the following relationship: -10.78 ⁇ (R1+R2)/(R1-R2) ⁇ -1.85, reasonable control of the first lens
  • the shape of the lens L1 enables the first lens L1 to effectively correct the spherical aberration of the system.
  • -6.74 ⁇ (R1+R2)/(R1-R2) ⁇ -2.23 is satisfied.
  • the on-axis thickness of the first lens L1 is defined as d1, which satisfies the following relationship: 0.04 ⁇ d1/TTL ⁇ 0.16, which is beneficial to realize ultra-thinness.
  • 0.06 ⁇ d1/TTL ⁇ 0.13 is satisfied.
  • the focal length of the second lens L2 is defined as f2, -33.69 ⁇ f2/f ⁇ -1.53.
  • f2 The focal length of the second lens L2 is defined as f2, -33.69 ⁇ f2/f ⁇ -1.53.
  • the on-axis thickness of the second lens L2 is defined as d3, which satisfies the following relationship: 0.02 ⁇ d3/TTL ⁇ 0.06, which is beneficial to realize ultra-thinness.
  • 0.03 ⁇ d3/TTL ⁇ 0.05 is satisfied.
  • the on-axis thickness of the third lens L3 is defined as d5, which satisfies the following relationship: 0.02 ⁇ d5/TTL ⁇ 0.20, which is beneficial to realize ultra-thinness.
  • 0.04 ⁇ d5/TTL ⁇ 0.16 is satisfied.
  • the focal length of the fourth lens L4 is defined as f4, which satisfies the following relationship: -53.95 ⁇ f4/f ⁇ 10.78.
  • the system has better imaging quality and lower sensitivity.
  • it satisfies -33.72 ⁇ f4/f ⁇ 8.62.
  • the curvature radius of the object side surface of the fourth lens L4 as R7
  • the curvature radius of the image side surface of the fourth lens L4 as R8, satisfying the following relationship: -26.27 ⁇ (R7+R8)/(R7-R8) ⁇ 2.47, which is
  • the shape of the fourth lens L4 is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view.
  • -16.42 ⁇ (R7+R8)/(R7-R8) ⁇ 1.98 is satisfied.
  • the on-axis thickness d7 of the fourth lens L4 also satisfies the following relationship: 0.02 ⁇ d7/TTL ⁇ 0.07, which is beneficial to realize ultra-thinness. Preferably, 0.03 ⁇ d7/TTL ⁇ 0.05 is satisfied.
  • the focal length of the fifth lens L5 is defined as f5, which satisfies the following relationship: -109.00 ⁇ f5/f ⁇ 41.48.
  • the limitation of the fifth lens L5 can effectively smooth the light angle of the imaging lens and reduce the tolerance sensitivity.
  • -68.12 ⁇ f5/f ⁇ 33.18 is satisfied.
  • the on-axis thickness of the fifth lens L5 is defined as d9, which satisfies the following relationship: 0.02 ⁇ d9/TTL ⁇ 0.06, which is conducive to achieving ultra-thinness.
  • 0.03 ⁇ d9/TTL ⁇ 0.05 is satisfied.
  • the focal length of the sixth lens L6 is defined as f6, which satisfies the following relationship: -307.64 ⁇ f6/f ⁇ 2.63.
  • the reasonable distribution of optical power enables the system to have better imaging quality and lower sensitivity.
  • -192.27 ⁇ f6/f ⁇ 2.10 is satisfied.
  • it is helpful to correct problems such as off-axis angle of view.
  • it satisfies -1.76 ⁇ (R11+R12)/(R11-R12) ⁇ 74.88.
  • the on-axis thickness of the sixth lens L6 is defined as d11, which satisfies the following relationship: 0.03 ⁇ d11/TTL ⁇ 0.08, which is beneficial to realize ultra-thinness.
  • 0.04 ⁇ d11/TTL ⁇ 0.06 is satisfied.
  • the focal length of the seventh lens L7 is defined as f7, which satisfies the following relationship: -59.14 ⁇ f7/f ⁇ 2.42.
  • f7 The focal length of the seventh lens L7
  • the system has better imaging quality and lower sensitivity.
  • -36.96 ⁇ f7/f ⁇ 1.94 is satisfied.
  • the curvature radius R13 of the object side surface of the seventh lens L7 and the curvature radius R14 of the image side surface of the seventh lens L7, which satisfies the following relationship: -7.31 ⁇ (R13+R14)/(R13-R14) ⁇ 26.20, which is the seventh
  • it is beneficial to correct the aberration of the off-axis angle of view Preferably, it satisfies -4.57 ⁇ (R13+R14)/(R13-R14) ⁇ 20.96.
  • the on-axis thickness of the seventh lens L7 is defined as d13, which satisfies the following relationship: 0.03 ⁇ d13/TTL ⁇ 0.09, which is beneficial to realize ultra-thinness.
  • 0.04 ⁇ d13/TTL ⁇ 0.07 is satisfied.
  • the focal length of the eighth lens L8 is defined as f8, which satisfies the following relational expression: -1.52 ⁇ f8/f ⁇ -0.49.
  • the reasonable distribution of optical power enables the system to have better imaging quality and lower sensitivity.
  • -0.95 ⁇ f8/f ⁇ -0.61 is satisfied.
  • the shape of the eight lens L8 is within the range of conditions, with the development of ultra-thin and wide-angle, it is conducive to correcting the aberration of the off-axis angle of view.
  • it satisfies -1.47 ⁇ (R15+R16)/(R15-R16) ⁇ -0.90.
  • the on-axis thickness of the eighth lens L8 is defined as d15, which satisfies the following relationship: 0.03 ⁇ d15/TTL ⁇ 0.08, which is beneficial to realize ultra-thinness.
  • 0.04 ⁇ d15/TTL ⁇ 0.06 is satisfied.
  • the imaging optical lens 10 can not only have good optical imaging performance, but also meet the design requirements of large aperture, wide-angle, and ultra-thinness.
  • the imaging optical lens 10 of the present invention will be described below with an example.
  • the symbols described in each example are as follows.
  • the unit of focal length, distance on axis, radius of curvature, thickness on axis, position of inflection point, and position of stagnation point is mm.
  • the object side and/or the image side of the lens can also be provided with inflection points and/or stagnation points to meet high-quality imaging requirements.
  • inflection points and/or stagnation points for specific implementations, refer to the following.
  • Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
  • R The radius of curvature of the optical surface, and the radius of curvature of the center of the lens
  • R1 the radius of curvature of the object side surface of the first lens L1;
  • R2 the radius of curvature of the image side surface of the first lens L1;
  • R3 the radius of curvature of the object side surface of the second lens L2;
  • R4 the radius of curvature of the image side surface of the second lens L2;
  • R5 the radius of curvature of the object side surface of the third lens L3;
  • R6 the radius of curvature of the image side surface of the third lens L3;
  • R7 the radius of curvature of the object side of the fourth lens L4;
  • R8 the radius of curvature of the image side surface of the fourth lens L4;
  • R9 the radius of curvature of the object side surface of the fifth lens L5;
  • R10 the radius of curvature of the image side surface of the fifth lens L5;
  • R11 the radius of curvature of the object side surface of the sixth lens L6;
  • R12 the radius of curvature of the image side surface of the sixth lens L6;
  • R13 the radius of curvature of the object side surface of the seventh lens L7;
  • R14 the radius of curvature of the image side surface of the seventh lens L7;
  • R15 the radius of curvature of the object side of the eighth lens L8;
  • R16 the radius of curvature of the image side surface of the eighth lens L8;
  • R17 the radius of curvature of the object side of the optical filter GF
  • R18 the radius of curvature of the image side surface of the optical filter GF
  • d0 the on-axis distance from the aperture S1 to the object side of the first lens L1;
  • d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;
  • d4 the on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;
  • d6 the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;
  • d10 the on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;
  • d11 the on-axis thickness of the sixth lens L6;
  • d12 the on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7;
  • d14 the on-axis distance from the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8;
  • d16 the on-axis distance from the image side surface of the eighth lens L8 to the object side surface of the optical filter GF;
  • d17 the axial thickness of the optical filter GF
  • nd refractive index of d-line
  • nd1 the refractive index of the d-line of the first lens L1;
  • nd2 the refractive index of the d-line of the second lens L2;
  • nd3 the refractive index of the d-line of the third lens L3;
  • nd4 the refractive index of the d-line of the fourth lens L4;
  • nd5 the refractive index of the d-line of the fifth lens L5;
  • nd6 the refractive index of the d-line of the sixth lens L6;
  • nd7 the refractive index of the d-line of the seventh lens L7;
  • nd8 the refractive index of the d-line of the eighth lens L8;
  • ndg the refractive index of the d-line of the optical filter GF
  • vg Abbe number of optical filter GF.
  • Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspherical coefficients.
  • the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (1).
  • the present invention is not limited to the aspheric polynomial form represented by the formula (1).
  • Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
  • P1R1 and P1R2 represent the object side and image side of the first lens L1 respectively
  • P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively
  • P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively.
  • P4R1, P4R2 represent the object side and image side of the fourth lens L4
  • P5R1, P5R2 represent the object side and image side of the fifth lens L5
  • P6R1, P6R2 represent the object side and image side of the sixth lens L6
  • P7R1 P7R2 represents the object side and image side of the seventh lens L7, respectively
  • P8R1 and P8R2 represent the object side and the image side of the eighth lens L8, respectively.
  • the corresponding data in the “reflection point position” column is the vertical distance from the reflex point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • the data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 10 of the first embodiment.
  • the field curvature S in FIG. 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction. song.
  • Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.
  • the first embodiment satisfies various conditional expressions.
  • the entrance pupil diameter of the imaging optical lens is 4.663mm
  • the full-field image height is 8.150mm
  • the diagonal field angle is 83.00°
  • wide-angle ultra-thin
  • its axis and axis The external chromatic aberration is fully corrected and has excellent optical characteristics.
  • the second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
  • Table 5 shows design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 6 shows the aspheric surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 7 shows the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • P6R2 1 0.745 To P7R1 2 1.395 3.715 P7R2 2 1.555 4.125 P8R1 2 2.555 5.975 P8R2 2 5.285 6.215
  • FIG. 6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 436 nm pass through the imaging optical lens 20 of the second embodiment.
  • FIG. 8 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 20 of the second embodiment.
  • the second embodiment satisfies various conditional expressions.
  • the entrance pupil diameter of the imaging optical lens is 4.662mm
  • the full-field image height is 8.150mm
  • the diagonal field angle is 83.00°
  • wide-angle, ultra-thin and its axis and axis
  • the external chromatic aberration is fully corrected and has excellent optical characteristics.
  • the third embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
  • Table 9 shows design data of the imaging optical lens 30 of the third embodiment of the present invention.
  • Table 10 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 11 shows the inflection point and stagnation point design data of each lens in the imaging optical lens 30 of the third embodiment of the present invention.
  • FIG. 10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 436 nm pass through the imaging optical lens 30 of the third embodiment.
  • FIG. 12 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 30 of the third embodiment.
  • the entrance pupil diameter of the imaging optical lens is 4.662mm
  • the full-field image height is 8.150mm
  • the diagonal field angle is 83.00°
  • wide-angle, ultra-thin and its axis and axis
  • the external chromatic aberration is fully corrected and has excellent optical characteristics.
  • Example 1 Example 2
  • Example 3 f1/f 1.06 1.42 1.88 f2 -20.65 -151.58 -47.77 (R5+R6)/(R5-R6) -4.21 -14.73 -1.82 d3/d4 7.94 6.40 2.57 f 9.000 8.998 8.998 f1 9.572 12.777 16.888 f3 23.627 83.940 12.538 f4 -242.780 64.642 -150.748 f5 -490.486 248.827 -68.137 f6 -1384.370 -45.267 15.747 f7 14.516 12.750 -266.051 f8 -6.579 -6.709 -6.848 f12 15.074 13.529 22.994 FNO 1.93 1.93 1.93
  • f12 is the combined focal length of the first lens L1 and the second lens L2.

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Abstract

L'invention concerne une lentille optique de capture d'image (10), contenant, dans l'ordre du côté objet au côté image : une première lentille (L1), une deuxième lentille (L2), une troisième lentille (L3), une quatrième lentille (L4), une cinquième lentille (L5), une sixième lentille (L6), une septième lentille (L7) et une huitième lentille (L8) ; en outre, les expressions relationnelles suivantes sont satisfaites : 1,05 ≤ f1/f ≤ 1,90 ; f2 ≤ 0 ; -15,00 ≤ (R5+R6) / (R5-R6) ≤ -1,80 ; 2,50 ≤ d3/d4 ≤ 8,00. La lentille optique de capture d'image a des bonnes propriétés optiques telles qu'une grande ouverture, un grand angle et une conception ultramince.
PCT/CN2019/127483 2019-12-23 2019-12-23 Lentille optique de capture d'image WO2021127859A1 (fr)

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