WO2022021457A1 - 摄像光学镜头 - Google Patents

摄像光学镜头 Download PDF

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Publication number
WO2022021457A1
WO2022021457A1 PCT/CN2020/106613 CN2020106613W WO2022021457A1 WO 2022021457 A1 WO2022021457 A1 WO 2022021457A1 CN 2020106613 W CN2020106613 W CN 2020106613W WO 2022021457 A1 WO2022021457 A1 WO 2022021457A1
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Prior art keywords
lens
imaging optical
curvature
ttl
radius
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PCT/CN2020/106613
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English (en)
French (fr)
Inventor
陈佳
孙雯
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诚瑞光学(常州)股份有限公司
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Publication of WO2022021457A1 publication Critical patent/WO2022021457A1/zh

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    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the 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 purpose of the present invention is to provide an imaging optical lens, which not only has good optical performance, but also has the characteristics of large aperture, wide angle, and ultra-thinness.
  • embodiments of the present invention provide an imaging optical lens, the imaging optical lens includes a total of eight lenses, and the eight lenses are sequentially from the object side to the image side: the first lens, the second lens Second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens;
  • At least one of the first lens to the eighth lens includes a free-form surface, the focal length of the second lens is f2, the focal length of the sixth lens is f6, and the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side surface of the first lens is R2, and satisfies the following relationship:
  • the on-axis thickness of the third lens is d5
  • the on-axis distance from the image side of the third lens to the object side of the fourth lens is d6, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • the focal length of the first lens is f1
  • the axial thickness of the first lens is d1
  • the total optical length of the imaging optical lens is TTL
  • the focal length of the imaging optical lens is f
  • 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 axis of the second lens is R4.
  • the thickness is d3
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • the focal length of the third lens is f3
  • the radius of curvature of the object side of the third lens is R5
  • the radius of curvature of the image side of the third lens is R6
  • the axial thickness of the third lens is d5
  • the optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • 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 axial thickness of the fourth lens is d7
  • the optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • 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 imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • 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
  • the axis of the sixth lens is R12.
  • the thickness is d11
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • 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 imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the imaging optical lens is f
  • 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 imaging optical lens is TTL, and the following relationship is satisfied:
  • the imaging optical lens according to the present invention has the characteristics of large aperture, wide angle, and ultra-thin optical imaging lens while having good optical performance, and is especially suitable for imaging elements such as CCD and CMOS with high pixels.
  • the mobile phone camera lens assembly and the WEB camera lens are composed.
  • FIG. 1 is a schematic structural diagram of an imaging optical lens according to a first embodiment of the present invention
  • Fig. 2 is the situation that the RMS spot diameter of the imaging optical lens shown in Fig. 1 is in the first quadrant;
  • FIG. 3 is a schematic structural diagram of an imaging optical lens according to a second embodiment of the present invention.
  • Fig. 4 is the situation that the RMS spot diameter of the imaging optical lens shown in Fig. 3 is in the first quadrant;
  • FIG. 5 is a schematic structural diagram of an imaging optical lens according to a third embodiment of the present invention.
  • Fig. 6 is the situation that the RMS spot diameter of the imaging optical lens shown in Fig. 5 is in the first quadrant;
  • FIG. 7 is a schematic structural diagram of an imaging optical lens according to a fourth embodiment of the present invention.
  • FIG. 8 shows the case where the RMS spot diameter of the imaging optical lens shown in FIG. 7 is in the first quadrant.
  • FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes eight lenses.
  • the imaging optical lens 10 from the object side to the image side, sequentially includes: a first lens L1, a second lens L2, an aperture S1, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens Lens L6, seventh lens L7, eighth lens L8.
  • Optical elements such as an optical filter GF may be provided between the eighth lens L8 and the image plane Si.
  • the first lens L1 is made of plastic material
  • the second lens L2 is made of plastic material
  • the third lens L3 is made of plastic material
  • the fourth lens L4 is made of plastic material
  • the fifth lens L5 is made of plastic material
  • the sixth lens L6 is made of plastic material It is made of plastic material
  • the seventh lens L7 is made of plastic material
  • the eighth lens L8 is made of plastic material; in other embodiments, each lens may also be made of other materials.
  • At least one of the first lens L1 to the eighth lens L8 includes a free-form surface, and the free-form surface helps to correct aberrations such as astigmatism, field curvature and distortion of the wide-angle optical system, thereby improving the imaging quality .
  • the focal length of the second lens L2 is defined as f2, and the focal length of the sixth lens L6 is f6, which satisfies the following relationship: -7.50 ⁇ f2/f6 ⁇ -1.50, which specifies the difference between the focal length of the second lens L2 and the focal length of the sixth lens L6 ratio, which helps to improve imaging quality within a range of conditions.
  • the radius of curvature of the object side of the first lens L1 is defined as R1, and the radius of curvature of the image side of the first lens L1 is R2, which satisfies the following relationship: -6.00 ⁇ R1/R2 ⁇ -0.18, which specifies the shape of the first lens L1. Within the range of conditions, it helps to reduce the degree of light deflection and improve the image quality.
  • the axial thickness of the third lens L3 is defined as d5, and the axial distance from the image side of the third lens L3 to the object side of the fourth lens L4 is d6, which satisfies the following relationship: 4.00 ⁇ d5/d6 ⁇ 9.00, when d5/ When d6 meets the conditions, it is beneficial to balance the field curvature of the system and improve the imaging quality.
  • the first lens L1 has a negative refractive power
  • the object side of the first lens L1 is concave at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the focal length of the first lens L1 is defined as f1
  • the focal length of the imaging optical lens 10 is defined as f, which satisfies the following relationship: -4.14 ⁇ f1/f ⁇ -1.07, which specifies the ratio of the negative refractive power of the first lens L1 to the overall focal length .
  • the first lens L1 has an appropriate negative refractive power, which is conducive to reducing system aberrations, and is also conducive to the development of ultra-thin and wide-angle lenses.
  • it satisfies -2.59 ⁇ f1/f ⁇ -1.34.
  • the shape of the first lens L1 enables the first lens L1 to effectively correct the spherical aberration of the system, preferably, it satisfies -0.85 ⁇ (R1+R2)/(R1-R2) ⁇ 0.85.
  • the on-axis thickness of the first lens L1 is defined as d1, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.03 ⁇ d1/TTL ⁇ 0.14, which is conducive to realizing ultra-thinning.
  • 0.05 ⁇ d1/TTL ⁇ 0.11 is satisfied.
  • the second lens L2 has a positive refractive power
  • the object side of the second lens L2 is convex at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the focal length of the second lens L2 is defined as f2, and the focal length of the imaging optical lens 10 is defined as f, which satisfies the following relationship: -28.38 ⁇ f2/f ⁇ 8.13.
  • f focal length of the imaging optical lens 10
  • -17.74 ⁇ f2/f ⁇ 6.50 is satisfied.
  • the on-axis thickness of the second lens L2 is defined as d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.02 ⁇ d3/TTL ⁇ 0.07, which is conducive to realizing ultra-thinning. Preferably, 0.03 ⁇ d3/TTL ⁇ 0.06 is satisfied.
  • the third lens L3 has a positive refractive power
  • the object side surface of the third lens L3 is convex at the paraxial position
  • the image side surface is convex at the paraxial position.
  • the focal length of the third lens L3 is defined as f3, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: 0.53 ⁇ f3/f ⁇ 10.57, through the reasonable distribution of optical power, the system has better imaging quality and better imaging quality. low sensitivity. Preferably, 0.84 ⁇ f3/f ⁇ 8.46 is satisfied.
  • the radius of curvature of the object side of the third lens L3 as R5
  • the radius of curvature of the image side of the third lens L3 as R6, which satisfies the following relationship: -6.72 ⁇ (R5+R6)/(R5-R6) ⁇ -0.10, which specifies
  • the shape of the third lens L3, within the range specified by the conditional expression can moderate the degree of deflection of light passing through the lens, thereby effectively reducing aberrations.
  • -4.20 ⁇ (R5+R6)/(R5-R6) ⁇ -0.12 is satisfied.
  • the on-axis thickness of the third lens L3 is defined as d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02 ⁇ d5/TTL ⁇ 0.12, which is conducive to realizing ultra-thinning. Preferably, 0.04 ⁇ d5/TTL ⁇ 0.10 is satisfied.
  • the fourth lens L4 has a positive refractive power
  • the object side of the fourth lens L4 is concave at the paraxial position
  • the image side surface is convex at the paraxial position.
  • the focal length of the fourth lens L4 is defined as f4, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: 0.65 ⁇ f4/f ⁇ 7.26, which specifies the ratio of the focal length of the fourth lens L4 to the system focal length, which is within the range of the conditional expression Helps improve optical system performance.
  • 1.04 ⁇ f4/f ⁇ 5.80 is satisfied.
  • the radius of curvature of the object side of the fourth lens L4 is defined as R7, and the radius of curvature of the image side of the fourth lens L4 is R8, which satisfies the following relationship: 0.14 ⁇ (R7+R8)/(R7-R8) ⁇ 6.79, which specifies the fourth
  • R7 The radius of curvature of the object side of the fourth lens L4
  • R8 The radius of curvature of the image side of the fourth lens L4
  • 0.14 ⁇ (R7+R8)/(R7-R8) ⁇ 6.79 which specifies the fourth
  • 0.23 ⁇ (R7+R8)/(R7-R8) ⁇ 5.43 is satisfied.
  • the axial thickness of the fourth lens L4 is defined as d7, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03 ⁇ d7/TTL ⁇ 0.15, which is conducive to realizing ultra-thinning.
  • 0.05 ⁇ d7/TTL ⁇ 0.12 is satisfied.
  • the fifth lens L5 has a negative refractive power
  • the object side of the fifth lens L5 is concave at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the focal length of the fifth lens L5 is defined as f5, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: -8.07 ⁇ f5/f ⁇ -1.92, the limitation of the fifth lens L5 can effectively make the light angle of the imaging lens Smooth and reduce tolerance sensitivity. Preferably, -5.05 ⁇ f5/f ⁇ -2.40 is satisfied.
  • the radius of curvature of the object side of the fifth lens L5 is defined as R9, and the radius of curvature of the image side of the fifth lens L5 is R10, which satisfies the following relationship: 0.02 ⁇ (R9+R10)/(R9-R10) ⁇ 6.14, which specifies the fifth
  • the shape of the lens L5, within the range of conditions, with the development of ultra-thin and wide-angle, is conducive to correcting the aberration of the off-axis drawing angle and other issues, preferably, satisfies 0.03 ⁇ (R9+R10)/(R9-R10) ⁇ 4.92.
  • the on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.02 ⁇ d9/TTL ⁇ 0.06, which is conducive to realizing ultra-thinning. Preferably, 0.03 ⁇ d9/TTL ⁇ 0.05 is satisfied.
  • the sixth lens L6 has a negative refractive power
  • the object side of the sixth lens L6 is concave at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the radius of curvature of the object side of the sixth lens is defined as R11, and the radius of curvature of the image side of the sixth lens is R12, which satisfies the following relationship: -1.17 ⁇ (R11+R12)/(R11-R12) ⁇ 0.60, it is specified that the sixth lens
  • the shape of the lens L6 is within the range of conditions, with the development of ultra-thin and wide-angle, it is beneficial to correct problems such as aberration of the off-axis picture angle.
  • -0.73 ⁇ (R11+R12)/(R11-R12) ⁇ 0.48 is satisfied.
  • the on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.05 ⁇ d11/TTL ⁇ 0.16, which is conducive to realizing ultra-thinning. Preferably, 0.07 ⁇ d11/TTL ⁇ 0.13 is satisfied.
  • the seventh lens L7 has a positive refractive power
  • the object side of the seventh lens L7 is convex at the paraxial position
  • the image side surface is convex at the paraxial position.
  • the focal length of the seventh lens L7 is defined as f7, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: 0.41 ⁇ f7/f ⁇ 1.99, through the reasonable distribution of the optical power, the system has better imaging quality and better imaging quality. low sensitivity. Preferably, 0.66 ⁇ f7/f ⁇ 1.59 is satisfied.
  • the radius of curvature of the object side of the seventh lens L7 is defined as R13, and the radius of curvature of the image side of the seventh lens L7 is R14, which satisfies the following relationship: 0.26 ⁇ (R13+R14)/(R13-R14) ⁇ 5.59, which specifies that the first
  • the shape of the seven-lens L7 within the range of conditions, is conducive to correcting problems such as aberrations in the off-axis picture angle with the development of ultra-thin and wide-angle.
  • 0.41 ⁇ (R13+R14)/(R13-R14) ⁇ 4.47 is satisfied.
  • the on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.04 ⁇ d13/TTL ⁇ 0.20, which is conducive to realizing ultra-thinning.
  • 0.06 ⁇ d13/TTL ⁇ 0.16 is satisfied.
  • the eighth lens L8 has a negative refractive power
  • the object side of the eighth lens L8 is convex at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the focal length of the eighth lens L8 is defined as f8, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: -2.74 ⁇ f8/f ⁇ -0.82, through the reasonable distribution of focal power, the system has better imaging quality and lower sensitivity.
  • -1.71 ⁇ f8/f ⁇ -1.02 is satisfied.
  • the on-axis thickness of the eighth lens L8 is defined as d15, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.03 ⁇ d15/TTL ⁇ 0.16, which is conducive to realizing ultra-thinning.
  • 0.05 ⁇ d15/TTL ⁇ 0.13 is satisfied.
  • the aperture value FNO of the imaging optical lens 10 is less than or equal to 2.06, the aperture is large, and the imaging performance is good.
  • the FNO is less than or equal to 2.02.
  • the total optical length TTL of the imaging optical lens 10 is less than or equal to 6.82 mm, which is favorable for realizing ultra-thinning.
  • the total optical length TTL is less than or equal to 6.51 mm.
  • the imaging optical lens 10 of the present invention will be described below by way of examples.
  • the symbols described in each example are as follows.
  • the focal length, on-axis distance, curvature radius, and on-axis thickness are in mm.
  • TTL total optical length (the on-axis distance from the object side of the first lens L1 to the imaging plane), in mm;
  • Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
  • the object side surface and the image side surface of the eighth lens L8 are free-form surfaces.
  • R the radius of curvature at the center of the optical surface
  • 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 curvature radius of the image side surface of the third lens L3;
  • R7 the curvature radius of the object side surface of the fourth lens L4;
  • R9 the curvature radius of the object side surface of the fifth lens L5;
  • R10 the curvature radius 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 curvature radius 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 curvature radius of the image side surface of the seventh lens L7;
  • R15 the radius of curvature of the object side surface of the eighth lens L8;
  • R16 the radius of curvature of the image side surface of the eighth lens L8;
  • R18 The curvature radius of the image side of the optical filter GF
  • d0 the on-axis distance from the aperture S1 to the object side surface of the first lens L1;
  • d4 the on-axis distance from the image side of the second lens L2 to the object side of the third lens L3;
  • d6 the on-axis distance from the image side of the third lens L3 to the object side of the fourth lens L4;
  • d10 the on-axis distance from the image side of the fifth lens L5 to the object side of the sixth lens L6;
  • d11 the on-axis thickness of the sixth lens L6;
  • d12 the on-axis distance from the image side of the sixth lens L6 to the object side of the seventh lens L7;
  • d14 the on-axis distance from the image side of the seventh lens L7 to the object side of the eighth lens L8;
  • d16 the on-axis distance from the image side of the eighth lens L8 to the object side of the optical filter GF;
  • d17 On-axis thickness of optical filter GF
  • nd the refractive index of the 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;
  • 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 aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, A16, A18, A20 are the aspheric coefficients
  • c is the curvature at the center of the optical surface
  • r is the vertical distance between the point on the aspheric curve and the optical axis
  • z is the depth of the aspheric surface (the vertical distance between a point on the aspheric surface with a distance r from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface).
  • the aspherical surface shown in the above formula (1) is used as the aspherical surface of each lens surface.
  • the present invention is not limited to the aspheric polynomial form represented by the formula (1).
  • Table 3 shows free-form surface data in the imaging optical lens 10 according to the first embodiment of the present invention.
  • k is the conic coefficient
  • Bi is the free-form surface coefficient
  • c is the curvature at the center of the optical surface
  • r is the vertical distance between the point on the free-form surface and the optical axis
  • x is the x-direction component of r
  • y is the y-direction of r component
  • z is the depth of the aspheric surface (the vertical distance between a point on the aspheric surface at a distance r from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface).
  • each free-form surface uses the Extended Polynomial (Extended Polynomial) shown in the above formula (2).
  • the present invention is not limited to the free-form surface polynomial form represented by the formula (2).
  • FIG. 2 shows the case where the RMS spot diameter of the imaging optical lens 10 of the first embodiment is within the first quadrant. It can be seen from FIG. 2 that the imaging optical lens 10 of the first embodiment can achieve good imaging quality.
  • Table 13 shows the values corresponding to the various numerical values in each of Examples 1, 2, 3, and 4 and the parameters specified in the conditional expressions.
  • the first embodiment satisfies each conditional expression.
  • the entrance pupil diameter ENPD of the imaging optical lens 10 is 1.000 mm
  • the full field of view image height (diagonal direction) IH is 6.000 mm
  • the x-direction image height is 4.800 mm
  • the y-direction image height is 3.600 mm
  • the imaging effect is the best in this rectangular range.
  • the FOV in the diagonal direction is 119.99°
  • the field angle in the x direction is 107.00°
  • the field angle in the y direction is 89.94°.
  • the camera optical lens 10 meets the wide-angle , Ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical properties.
  • the second embodiment is basically the same as the first embodiment, the meanings of symbols are the same as those of the first embodiment, and only the differences are listed below.
  • the image side surface of the third lens L3 is concave at the paraxial position.
  • the object side surface of the fourth lens L4 is convex at the paraxial position.
  • Table 4 and Table 5 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • the object side surface and the image side surface of the seventh lens L7 are free curved surfaces.
  • Table 5 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 6 shows free-form surface data in the imaging optical lens 20 according to the second embodiment of the present invention.
  • FIG. 4 shows the case where the RMS spot diameter of the imaging optical lens 20 of the second embodiment is within the first quadrant. It can be seen from FIG. 4 that the imaging optical lens 20 of the second embodiment can achieve good imaging quality.
  • the second embodiment satisfies each conditional expression.
  • the entrance pupil diameter ENPD of the imaging optical lens 20 is 1.000mm, the full field of view image height (diagonal direction) IH is 6.000mm, the image height in the x direction is 4.800mm, and the image height in the y direction is 3.600mm, the imaging effect is the best in this rectangular range.
  • the FOV in the diagonal direction is 119.99°, the field angle in the x direction is 106.86°, and the field angle in the y direction is 90.50°.
  • the camera optical lens 20 meets the wide angle. , Ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical properties.
  • the third embodiment is basically the same as the first embodiment, the meanings of symbols are the same as those of the first embodiment, and only the differences are listed below.
  • the second lens L2 has negative refractive power
  • the object side of the fifth lens L5 is convex at the paraxial position
  • the sixth lens L6 has positive refractive power
  • the object side of the sixth lens L6 is convex at the paraxial position
  • the image side is convex at the near axis
  • the axis is convex
  • the object side of the seventh lens L7 is concave at the paraxial.
  • the aperture S1 is provided between the first lens L1 and the second lens L2.
  • Tables 7 and 8 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
  • the object side surface and the image side surface of the first lens L1 are free-form surfaces.
  • Table 8 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 9 shows free-form surface data in the imaging optical lens 30 according to the third embodiment of the present invention.
  • FIG. 6 shows the case where the RMS spot diameter of the imaging optical lens 30 of the third embodiment is within the first quadrant. It can be seen from FIG. 6 that the imaging optical lens 30 of the third embodiment can achieve good imaging quality.
  • the entrance pupil diameter ENPD of the imaging optical lens 30 is 1.042mm
  • the full field of view image height (diagonal direction) IH is 6.000mm
  • the image height in the x direction is 4.800mm
  • the image height in the y direction is 3.600mm
  • the imaging effect is the best in this rectangular range.
  • the FOV in the diagonal direction is 121.90°
  • the field angle in the x direction is 98.29°
  • the field angle in the y direction is 78.47°.
  • the camera optical lens 30 meets the wide angle. , Ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical properties.
  • the fourth embodiment is basically the same as the first embodiment, the meanings of symbols are the same as those of the first embodiment, and only the differences are listed below.
  • the second lens L2 has negative refractive power
  • the object side of the fifth lens L5 is convex at the paraxial position
  • the sixth lens L6 has positive refractive power
  • the object side of the sixth lens L6 is convex at the paraxial position
  • the image side is at the paraxial position
  • the object side of the seventh lens L7 is concave at the paraxial position.
  • the aperture S1 is provided between the first lens L1 and the second lens L2.
  • Table 10 and Table 11 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
  • the object side surface and the image side surface of the second lens L2 are free curved surfaces.
  • Table 11 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
  • Table 12 shows free-form surface data in the imaging optical lens 40 according to the fourth embodiment of the present invention.
  • FIG. 8 shows the case where the RMS spot diameter of the imaging optical lens 40 of the fourth embodiment is within the first quadrant. It can be seen from FIG. 8 that the imaging optical lens 40 of the fourth embodiment can achieve good imaging quality.
  • the entrance pupil diameter ENPD of the imaging optical lens 40 is 1.054mm
  • the full field of view image height (diagonal direction) IH is 6.000mm
  • the image height in the x direction is 4.800mm
  • the image height in the y direction is 3.600mm
  • the imaging effect is the best in this rectangular range.
  • the FOV in the diagonal direction is 122.35°
  • the field angle in the x direction is 98.71°
  • the field angle in the y direction is 78.16°.
  • the camera optical lens 40 meets the wide angle. , Ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical properties.
  • Example 1 Example 2
  • Example 3 Example 4 f2/f6 -2.07 -1.74 -6.85 -7.31 R1/R2 -0.19 -0.28 -5.34 -5.94

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Abstract

摄像光学镜头（10，20，30，40）共包含八片透镜，八片透镜自物侧至像侧依序为：第一透镜（L1），第二透镜（L2），第三透镜（L3），第四透镜（L4），第五透镜（L5），第六透镜（L6），第七透镜（L7）以及第八透镜（L8）；第一透镜（L1）至第八透镜（L8）中的至少一个含自由曲面，第二透镜（L2）的焦距为f2，第六透镜（L6）的焦距为f6，第一透镜（L1）物侧面的曲率半径为R1，第一透镜（L1）像侧面的曲率半径为R2，且满足下列关系式：-7.50≤f2/f6≤-1.50；-6.00≤R1/R2≤-0.18；摄像光学镜头（10，20，30，40）具有良好光学性能的同时，具有大光圈、广角化、超薄的特点。

Description

摄像光学镜头 技术领域
本发明涉及光学镜头领域，特别涉及一种适用于智能手机、数码相机等手提终端设备，以及监视器、PC镜头等摄像装置的摄像光学镜头。
背景技术
随着成像镜头的发展，人们对镜头的成像要求越来越高，镜头的“夜景拍照”和“背景虚化”也成为衡量镜头成像标准的重要指标。现有结构的摄像光学镜头由于光焦度分配、透镜间隔和透镜形状设置不充分，会造成镜头超薄化和广角化不充分。而且，目前多采用旋转对称的非球面，这类非球面只在子午平面内具有充分的自由度，并不能很好地矫正像差。自由曲面是一种非旋转对称的表面类型，能够更好地平衡像差，提高成像质量，而且自由曲面的加工也逐渐成熟。随着对镜头成像要求的提升，在设计镜头时加入自由曲面显得十分重要，尤其是在广角和超广角镜头的设计中效果更为明显。
发明内容
针对上述问题，本发明的目的在于提供一种摄像光学镜头，其具有良好光学性能的同时，具有大光圈、广角化、超薄的特点。
为解决上述技术问题，本发明的实施方式提供了一种摄像光学镜头，所述摄像光学镜头共包含八片透镜，八片所述透镜自物侧至像侧依序为：第一透镜，第二透镜，第三透镜，第四透镜，第五透镜，第六透镜，第七透镜以及第八透镜；
所述第一透镜至所述第八透镜中的至少一个含自由曲面，所述第二透镜的焦距为f2，所述第六透镜的焦距为f6，所述第一透镜物侧面的曲率半径为R1，所述第一透镜像侧面的曲率半径为R2，且满足下列关系式：
-7.50≤f2/f6≤-1.50；
-6.00≤R1/R2≤-0.18。
作为一种改进方式，所述第三透镜的轴上厚度为d5，所述第三透镜的像侧面到所述第四透镜的物侧面的轴上距离为d6，且满足下列关系式：
4.00≤d5/d6≤9.00。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第一透镜的焦距为f1，所 述第一透镜的轴上厚度为d1，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
-4.14≤f1/f≤-1.07；
-1.36≤(R1+R2)/(R1-R2)≤1.07；
0.03≤d1/TTL≤0.14。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第二透镜物侧面的曲率半径为R3，所述第二透镜像侧面的曲率半径为R4，所述第二透镜的轴上厚度为d3，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
-28.38≤f2/f≤8.13；
-12.87≤(R3+R4)/(R3-R4)≤18.86；
0.02≤d3/TTL≤0.07。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第三透镜的焦距为f3，所述第三透镜物侧面的曲率半径为R5，所述第三透镜像侧面的曲率半径为R6，所述第三透镜的轴上厚度为d5，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
0.53≤f3/f≤10.57；
-6.72≤(R5+R6)/(R5-R6)≤-0.10；
0.02≤d5/TTL≤0.12。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第四透镜的焦距为f4，所述第四透镜物侧面的曲率半径为R7，所述第四透镜像侧面的曲率半径为R8，所述第四透镜的轴上厚度为d7，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
0.65≤f4/f≤7.26；
0.14≤(R7+R8)/(R7-R8)≤6.79；
0.03≤d7/TTL≤0.15。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第五透镜的焦距为f5，所述第五透镜物侧面的曲率半径为R9，所述第五透镜像侧面的曲率半径为R10，所述第五透镜的轴上厚度为d9，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
-8.07≤f5/f≤-1.92；
0.02≤(R9+R10)/(R9-R10)≤6.14；
0.02≤d9/TTL≤0.06。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第六透镜物侧面的曲率半径为R11，所述第六透镜像侧面的曲率半径为R12，所述第六透镜的轴上厚度为d11，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
-6.00≤f6/f≤2.97；
-1.17≤(R11+R12)/(R11-R12)≤0.60；
0.05≤d11/TTL≤0.16。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第七透镜的焦距为f7，所述第七透镜物侧面的曲率半径为R13，所述第七透镜像侧面的曲率半径为R14，所述第七透镜的轴上厚度为d13，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
0.41≤f7/f≤1.99；
0.26≤(R13+R14)/(R13-R14)≤5.59；
0.04≤d13/TTL≤0.20。
作为一种改进方式，所述摄像光学镜头的焦距为f，所述第八透镜的焦距为f8，所述第八透镜物侧面的曲率半径为R15，所述第八透镜像侧面的曲率半径为R16，所述第八透镜的轴上厚度为d15，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
-2.74≤f8/f≤-0.82；
1.15≤(R15+R16)/(R15-R16)≤4.00；
0.03≤d15/TTL≤0.16。
本发明的有益效果在于：根据本发明的摄像光学镜头具有良好光学性能的同时，具有大光圈、广角化、超薄的光学摄像镜头特点，尤其适用于由高像素用的CCD、CMOS等摄像元件构成的手机摄像镜头组件和WEB摄像镜头。
附图说明
为了更清楚地说明本发明实施方式中的技术方案，下面将对实施方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1是本发明第一实施方式的摄像光学镜头的结构示意图；
图2是图1所示摄像光学镜头的RMS光斑直径在第一象限内的情况；
图3是本发明第二实施方式的摄像光学镜头的结构示意图；
图4是图3所示摄像光学镜头的RMS光斑直径在第一象限内的情况；
图5是本发明第三实施方式的摄像光学镜头的结构示意图；
图6是图5所示摄像光学镜头的RMS光斑直径在第一象限内的情况；
图7是本发明第四实施方式的摄像光学镜头的结构示意图；
图8是图7所示摄像光学镜头的RMS光斑直径在第一象限内的情况。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明的各实施方式进行详细的阐述。然而，本领域的普通技术人员可以理解，在本发明各实施方式中，为了使读者更好地理解本发明而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本发明所要求保护的技术方案。
(第一实施方式)
参考附图，本发明提供了一种摄像光学镜头10。图1所示为本发明第一实施方式的摄像光学镜头10，该摄像光学镜头10包括八个透镜。具体的，所述摄像光学镜头10，由物侧至像侧依序包括：第一透镜L1、第二透镜L2、光圈S1、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、第七透镜L7、第八透镜L8。第八透镜L8和像面Si之间可设置有光学过滤片(filter)GF等光学元件。在本实施方式中，第一透镜L1为塑料材质，第二透镜L2为塑料材质，第三透镜L3为塑料材质，第四透镜L4为塑料材质，第五透镜L5为塑料材质，第六透镜L6为塑料材质，第七透镜L7为塑料材质，第八透镜L8为塑料材质；在其他实施方式中，各透镜也可以是其他材质。
在本实施方式中，定义所述第一透镜L1至第八透镜L8中的至少一个含自由曲面，自由曲面有助于广角光学系统像散、场曲和畸变等像差校正，进而提高成像质量。
定义第二透镜L2的焦距为f2，第六透镜L6的焦距为f6，满足下列关系式：-7.50≤f2/f6≤-1.50，规定了第二透镜L2的焦距与第六透镜L6的焦距的比值，在条件范围内有助于提高成像质量。
定义第一透镜L1物侧面的曲率半径为R1，第一透镜L1像侧面的曲率半径为R2，满足下列关系式：-6.00≤R1/R2≤-0.18，规定了第一透镜L1的形状，在条件范围内有助于降低光线偏折程度，提升成像品质。
定义第三透镜L3的轴上厚度为d5，第三透镜L3的像侧面到第四透镜L4的物侧面的轴上距离为d6，满足下列关系式：4.00≤d5/d6≤9.00，当d5/d6满足条件时，有利于平衡系统场曲，提高成像质量。
本实施方式中，第一透镜L1具有负屈折力，第一透镜L1的物侧面于近轴处为凹面，像侧面于近轴处为凹面。
定义第一透镜L1的焦距为f1，定义摄像光学镜头10的焦距为f，满足下列关系式：-4.14≤f1/f≤-1.07，规定了第一透镜L1的负屈折力与整体焦距的比值。在规定的范围内时，第一透镜L1具有适当的负屈折力，有利于减小系统像差，同时有利于镜头向超薄化、广角化发展，优选地，满足-2.59≤f1/f≤-1.34。
定义第一透镜L1物侧面的曲率半径为R1，第一透镜L1像侧面的曲率半径为R2，满足下列关系式：-1.36≤(R1+R2)/(R1-R2)≤1.07，合理控制第一透镜L1的形状，使得第一透镜L1能够有效地校正系统球差，优选地，满足-0.85≤(R1+R2)/(R1-R2)≤0.85。
定义第一透镜L1的轴上厚度为d1，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.03≤d1/TTL≤0.14，有利于实现超薄化。优选地，满足0.05≤d1/TTL≤0.11。
本实施方式中，第二透镜L2具有正屈折力，第二透镜L2的物侧面于近轴处为凸面，像侧面于近轴处为凹面。
定义第二透镜L2的焦距为f2，定义摄像光学镜头10的焦距为f，满足下列关系式：-28.38≤f2/f≤8.13，通过将第二透镜L2的光焦度控制在合理范围，有利于矫正光学系统的像差。优选地，满足-17.74≤f2/f≤6.50。
定义第二透镜L2物侧面的曲率半径为R3，第二透镜L2像侧面的曲率半径为R4，满足下列关系式：-12.87≤(R3+R4)/(R3-R4)≤18.86，规定了第二透镜L2的形状，在范围内时，随着镜头向超薄广角化发展，有利于补正轴上色像差问题，优选地，满足-8.04≤(R3+R4)/(R3-R4)≤15.09。
定义第二透镜L2的轴上厚度为d3，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.02≤d3/TTL≤0.07，有利于实现超薄化。优选地，满足0.03≤d3/TTL≤0.06。
本实施方式中，第三透镜L3具有正屈折力，第三透镜L3的物侧面于近轴处为凸面，像侧面于近轴处为凸面。
定义第三透镜L3的焦距为f3，摄像光学镜头10的焦距为f，满足下列关系式：0.53≤f3/f≤10.57，通过光焦度的合理分配，使得系统具有较佳的成像品质和较低的敏感性。优选地，满足0.84≤f3/f≤8.46。
定义第三透镜L3物侧面的曲率半径为R5，第三透镜L3像侧面的曲率半径为R6，满足下列关系式：-6.72≤(R5+R6)/(R5-R6)≤-0.10，规定了第三透镜L3的形状，在条件式规定范围内，可以缓和光线经过镜片的偏折程度，有效减小像差。优选地，满足-4.20≤(R5+R6)/(R5-R6)≤-0.12。
定义第三透镜L3的轴上厚度为d5，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.02≤d5/TTL≤0.12，有利于实现超薄化。优选地，满足0.04≤d5/TTL≤0.10。
本实施方式中，第四透镜L4具有正屈折力，第四透镜L4的物侧面于近轴处为凹面，像侧面于近轴处为凸面。
定义第四透镜L4的焦距为f4，摄像光学镜头10的焦距为f，满足下列关系式：0.65≤f4/f≤7.26，规定了第四透镜L4焦距与系统焦距的比值，在条件式范围内有助于提高光学系统性能。优选地，满足1.04≤f4/f≤5.80。
定义第四透镜L4物侧面的曲率半径为R7，第四透镜L4像侧面的曲率半径为R8，满足下列关系式：0.14≤(R7+R8)/(R7-R8)≤6.79，规定了第四透镜L4的形状，在范围内时，随着超薄广角化的发展，有利于补正轴外画角的像差等问题。优选地，满足0.23≤(R7+R8)/(R7-R8)≤5.43。
定义第四透镜L4的轴上厚度为d7，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.03≤d7/TTL≤0.15，有利于实现超薄化。优选地，满足0.05≤d7/TTL≤0.12。
本实施方式中，第五透镜L5具有负屈折力，第五透镜L5的物侧面于近轴处为凹面，像侧面于近轴处为凹面。
定义第五透镜L5的焦距为f5，摄像光学镜头10的焦距为f，满足下列关系式：-8.07≤f5/f≤-1.92，对第五透镜L5的限定可有效的使得摄像镜头的光线角度平缓，降低公差敏感度。优选地，满足-5.05≤f5/f≤-2.40。
定义第五透镜L5物侧面的曲率半径为R9，第五透镜L5像侧面的曲率半径为R10，满足下列关系式：0.02≤(R9+R10)/(R9-R10)≤6.14，规定了第五透镜L5的形状，在条件范围内，随着超薄广角化的发展，有利于补正轴外画角的像差等问题，优选地，满足0.03≤(R9+R10)/(R9-R10)≤4.92。
定义第五透镜L5的轴上厚度为d9，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.02≤d9/TTL≤0.06，有利于实现超薄化。优选地，满足0.03≤d9/TTL≤0.05。
本实施方式中，第六透镜L6具有负屈折力，第六透镜L6的物侧面于近轴处为凹面，像侧面于近轴处为凹面。
定义第六透镜L6的焦距为f6，摄像光学镜头10的焦距为f，满足下列关系式：-6.00≤f6/f≤2.97，通过光焦度的合理分配，使得系统具有较佳的成像品质和较低的敏感性。优选地，满足-3.75≤f6/f≤2.37。
定义第六透镜物侧面的曲率半径为R11，第六透镜像侧面的曲率半径为R12，满足下列关系式：-1.17≤(R11+R12)/(R11-R12)≤0.60，规定的是第六透镜L6的形状，在条件范围内时，随着超薄广角化发展，有利于补正轴外画角的像差等问题。优选地，满足-0.73≤(R11+R12)/(R11-R12)≤0.48。
定义第六透镜L6的轴上厚度为d11，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.05≤d11/TTL≤0.16，有利于实现超薄化。优选地，满足0.07≤d11/TTL≤0.13。
本实施方式中，第七透镜L7具有正屈折力，第七透镜L7的物侧面于近轴处为凸面，像侧面于近轴处为凸面。
定义第七透镜L7的焦距为f7，摄像光学镜头10的焦距为f，满足下列关系式：0.41≤f7/f≤1.99，通过光焦度的合理分配，使得系统具有较佳的成像品质和较低的敏感性。优选地，满足0.66≤f7/f≤1.59。
定义第七透镜L7物侧面的曲率半径为R13，第七透镜L7像侧面的曲率半径为R14，满足下列关系式：0.26≤(R13+R14)/(R13-R14)≤5.59，规定的是第七透镜L7的形状，在条件范围内时，随着超薄广角化发展，有利于补正轴外画角的像差等问题。优选地，满足0.41≤(R13+R14)/(R13-R14)≤4.47。
定义第七透镜L7的轴上厚度为d13，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.04≤d13/TTL≤0.20，有利于实现超薄化。优选地，满足0.06≤d13/TTL≤0.16。
本实施方式中，第八透镜L8具有负屈折力，第八透镜L8的物侧面于近轴处为凸面，像侧面于近轴处为凹面。
定义第八透镜L8的焦距为f8，摄像光学镜头10的焦距为f，满足下列关系式：-2.74≤f8/f≤-0.82，通过光焦度的合理分配，使得系统具有较佳的成像品质和较低的敏感性。优选地，满足-1.71≤f8/f≤-1.02。
定义第八透镜L8物侧面的曲率半径为R15，第八透镜L8像侧面的曲率半径为R16，满足下列关系式：1.15≤(R15+R16)/(R15-R16)≤4.00，规定的是第八透镜L8的形状，在条件范围内时，随着超薄广角化发展，有利于补正轴外画角的像差等问题。优选地，满足1.84≤(R15+R16)/(R15-R16)≤3.20。
定义第八透镜L8的轴上厚度为d15，摄像光学镜头10的光学总长为TTL，满足下列关系式：0.03≤d15/TTL≤0.16，有利于实现超薄化。优选地，满足0.05≤d15/TTL≤0.13。
本实施方式中，摄像光学镜头10的光圈值FNO小于或等于2.06，大光圈，成像性能好。优选地，FNO小于或等于2.02。
本实施方式中，摄像光学镜头的光学总长TTL与全视场像高(对角线方向)IH的比值TTL/IH≤2.07，有利于实现超薄化。对角线方向的视场角FOV大于或等于119°，有利于实现广角化。
本实施方式中，摄像光学镜头10的光学总长TTL小于或等于6.82毫米，有利于实现超薄化。优选地，光学总长TTL小于或等于6.51毫米。
当满足上述关系时，使得摄像光学镜头10具有良好光学性能的同时，采用自由曲面，可实现设计像面区域与实际使用区域匹配，最大程度提升有效区域的像质；根据该光学镜头10的特性，该光学镜头10尤其适用于由高像素用的CCD、CMOS等摄像元件构成的手机摄像镜头组件和WEB摄像镜头。
下面将用实例进行说明本发明的摄像光学镜头10。各实例中所记载的符号如下所示。焦距、轴上距离、曲率半径、轴上厚度的单位为mm。
TTL：光学总长(第一透镜L1的物侧面到成像面的轴上距离)，单位为mm；
光圈值FNO：是指摄像光学镜头的有效焦距和入瞳直径的比值。
表1、表2示出本发明第一实施方式的摄像光学镜头10的设计数据。其中，第八透镜L8的物侧面和像侧面为自由曲面。
【表1】
Figure PCTCN2020106613-appb-000001
Figure PCTCN2020106613-appb-000002
其中，各符号的含义如下。
S1：光圈；
R：光学面中心处的曲率半径；
R1：第一透镜L1的物侧面的曲率半径；
R2：第一透镜L1的像侧面的曲率半径；
R3：第二透镜L2的物侧面的曲率半径；
R4：第二透镜L2的像侧面的曲率半径；
R5：第三透镜L3的物侧面的曲率半径；
R6：第三透镜L3的像侧面的曲率半径；
R7：第四透镜L4的物侧面的曲率半径；
R8：第四透镜L4的像侧面的曲率半径；
R9：第五透镜L5的物侧面的曲率半径；
R10：第五透镜L5的像侧面的曲率半径；
R11：第六透镜L6的物侧面的曲率半径；
R12：第六透镜L6的像侧面的曲率半径；
R13：第七透镜L7的物侧面的曲率半径；
R14：第七透镜L7的像侧面的曲率半径；
R15：第八透镜L8的物侧面的曲率半径；
R16：第八透镜L8的像侧面的曲率半径；
R17：光学过滤片GF的物侧面的曲率半径；
R18：光学过滤片GF的像侧面的曲率半径；
d：透镜的轴上厚度以及透镜之间的轴上距离；
d0：光圈S1到第一透镜L1的物侧面的轴上距离；
d1：第一透镜L1的轴上厚度；
d2：第一透镜L1的像侧面到第二透镜L2的物侧面的轴上距离；
d3：第二透镜L2的轴上厚度；
d4：第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离；
d5：第三透镜L3的轴上厚度；
d6：第三透镜L3的像侧面到第四透镜L4的物侧面的轴上距离；
d7：第四透镜L4的轴上厚度；
d8：第四透镜L4的像侧面到第五透镜L5的物侧面的轴上距离；
d9：第五透镜L5的轴上厚度；
d10：第五透镜L5的像侧面到第六透镜L6的物侧面的轴上距离；
d11：第六透镜L6的轴上厚度；
d12：第六透镜L6的像侧面到第七透镜L7的物侧面的轴上距离；
d13：第六透镜L7的轴上厚度；
d14：第七透镜L7的像侧面到第八透镜L8的物侧面的轴上距离；
d15：第八透镜L8的轴上厚度；
d16：第八透镜L8的像侧面到光学过滤片GF的物侧面的轴上距离；
d17：光学过滤片GF的轴上厚度；
d18：光学过滤片GF的像侧面到像面的轴上距离；
nd：d线的折射率；
nd1：第一透镜L1的d线的折射率；
nd2：第二透镜L2的d线的折射率；
nd3：第三透镜L3的d线的折射率；
nd4：第四透镜L4的d线的折射率；
nd5：第五透镜L5的d线的折射率；
nd6：第六透镜L6的d线的折射率；
nd7：第七透镜L7的d线的折射率；
nd8：第八透镜L8的d线的折射率；
ndg：光学过滤片GF的d线的折射率；
vd：阿贝数；
v1：第一透镜L1的阿贝数；
v2：第二透镜L2的阿贝数；
v3：第三透镜L3的阿贝数；
v4：第四透镜L4的阿贝数；
v5：第五透镜L5的阿贝数；
v6：第六透镜L6的阿贝数；
v7：第七透镜L7的阿贝数；
v8：第八透镜L8的阿贝数；
vg：光学过滤片GF的阿贝数。
表2示出本发明第一实施方式的摄像光学镜头10中各透镜的非球面数据。
【表2】
Figure PCTCN2020106613-appb-000003
Figure PCTCN2020106613-appb-000004
z＝(cr 2)/{1+[1-(k+1)(c 2r 2)] 1/2}+A4r 4+A6r 6+A8r 8+A10r 10+A12r 12+A14r 14+A16r 16+A18r 18+A20r 2 0              (1)
其中，k是圆锥系数，A4、A6、A8、A10、A12、A14、A16、A18、A20是非球面系数，c是光学面中心处的曲率，r是非球面曲线上的点与光轴的垂直距离，z是非球面深度(非球面上距离光轴为r的点，与相切于非球面光轴上顶点的切面两者间的垂直距离)。
为方便起见，各个透镜面的非球面使用上述公式(1)中所示的非球面。但是，本发明不限于该公式(1)表示的非球面多项式形式。
表3示出本发明第一实施方式的摄像光学镜头10中的自由曲面数据。
【表3】
Figure PCTCN2020106613-appb-000005
Figure PCTCN2020106613-appb-000006
Figure PCTCN2020106613-appb-000007
其中，k是圆锥系数，Bi是自由曲面系数，c是光学面中心处的曲率，r是自由曲面上的点与光轴的垂直距离，x是r的x方向分量，y是r的y方向分量，z是非球面深度(非球面上距离光轴为r的点，与相切于非球面光轴上顶点的切面两者间的垂直距离)。
为方便起见，各个自由曲面使用上述公式(2)中所示的扩展多项式面型(Extended Polynomial)。但是，本发明不限于该公式(2)表示的自由曲面多项式形式。
图2示出了第一实施例的摄像光学镜头10的RMS光斑直径在第一象限内的情况，根据图2可知，第一实施方式的摄像光学镜头10能够实现良好的成像品质。
后出现的表13示出各实例1、2、3、4中各种数值与条件式中已规定的参数所对应的值。
如表13所示，第一实施方式满足各条件式。
在本实施方式中，摄像光学镜头10的入瞳直径ENPD为1.000mm，全视场像高(对角线方向)IH为6.000mm，x方向像高为4.800mm，y方向像高为3.600mm，在此矩形范围内成像效果最佳，对角线方向的视场角FOV为119.99°，x方向的视场角为107.00°，y方向的视场角为89.94°，摄像光学镜头10满足广角、超薄，其轴上、轴外色像被差充分补正，且具有优秀的光学特性。
(第二实施方式)
第二实施方式与第一实施方式基本相同，符号含义与第一实施方式相同，以下只列出不同点。
本实施方式中，第三透镜L3的像侧面于近轴处为凹面。第四透镜L4的物侧面于近轴处为凸面。
表4、表5示出本发明第二实施方式的摄像光学镜头20的设计数据。其中，第七透镜L7的物侧面和像侧面为自由曲面。
【表4】
Figure PCTCN2020106613-appb-000008
表5示出本发明第二实施方式的摄像光学镜头20中各透镜的非球面数据。
【表5】
Figure PCTCN2020106613-appb-000009
Figure PCTCN2020106613-appb-000010
表6示出本发明第二实施方式的摄像光学镜头20中的自由曲面数据。
【表6】
Figure PCTCN2020106613-appb-000011
图4示出了第二实施例的摄像光学镜头20的RMS光斑直径在第一象限内的情况，根据图4可知，第二实施方式的摄像光学镜头20能够实现良好的成像品质。
如表13所示，第二实施方式满足各条件式。
在本实施方式中，所述摄像光学镜头20的入瞳直径ENPD为1.000mm，全视场像高(对角线方向)IH为6.000mm，x方向像高为4.800mm，y方向像高为3.600mm，在此矩形范围内成像效果最佳，对角线方向的视场角FOV为119.99°，x方向视场角为 106.86°，y方向视场角为90.50°，摄像光学镜头20满足广角、超薄，其轴上、轴外色像差被充分补正，且具有优秀的光学特性。
(第三实施方式)
第三实施方式与第一实施方式基本相同，符号含义与第一实施方式相同，以下只列出不同点。
第二透镜L2具有负屈折力，第五透镜L5的物侧面于近轴处为凸面，第六透镜L6具有正屈折力，第六透镜L6的物侧面于近轴处为凸面，像侧面于近轴处为凸面，第七透镜L7的物侧面于近轴处为凹面。光圈S1设在第一透镜L1和第二透镜L2之间。
表7、表8示出本发明第三实施方式的摄像光学镜头30的设计数据。其中，第一透镜L1的物侧面和像侧面为自由曲面。
【表7】
Figure PCTCN2020106613-appb-000012
表8示出本发明第三实施方式的摄像光学镜头30中各透镜的非球面数据。
【表8】
Figure PCTCN2020106613-appb-000013
Figure PCTCN2020106613-appb-000014
表9示出本发明第三实施方式的摄像光学镜头30中的自由曲面数据。
【表9】
Figure PCTCN2020106613-appb-000015
Figure PCTCN2020106613-appb-000016
图6示出了第三实施例的摄像光学镜头30的RMS光斑直径在第一象限内的情况，根据图6可知，第三实施方式的摄像光学镜头30能够实现良好的成像品质。
以下表13按照上述条件式列出了本实施方式中对应各条件式的数值。显然，本实施方式的摄像光学系统满足上述的条件式。
在本实施方式中，所述摄像光学镜头30的入瞳直径ENPD为1.042mm，全视场像高(对角线方向)IH为6.000mm，x方向像高为4.800mm，y方向像高为3.600mm，在此矩形范围内成像效果最佳，对角线方向的视场角FOV为121.90°，x方向视场角为98.29°，y方向视场角为78.47°，摄像光学镜头30满足广角、超薄，其轴上、轴外色像差被充分补正，且具有优秀的光学特性。
(第四实施方式)
第四实施方式与第一实施方式基本相同，符号含义与第一实施方式相同，以下只列出不同点。
第二透镜L2具有负屈折力，第五透镜L5的物侧面于近轴处为凸面第六透镜L6具有正屈折力，第六透镜L6的物侧面于近轴处为凸面，像侧面于近轴处为凸面，第七透镜L7的物侧面于近轴处为凹面。光圈S1设在第一透镜L1和第二透镜L2之间。
表10、表11示出本发明第四实施方式的摄像光学镜头40的设计数据。其中，第二透镜L2的物侧面和像侧面为自由曲面。
【表10】
Figure PCTCN2020106613-appb-000017
Figure PCTCN2020106613-appb-000018
表11示出本发明第四实施方式的摄像光学镜头40中各透镜的非球面数据。
【表11】
Figure PCTCN2020106613-appb-000019
Figure PCTCN2020106613-appb-000020
表12示出本发明第四实施方式的摄像光学镜头40中的自由曲面数据。
【表12】
Figure PCTCN2020106613-appb-000021
图8示出了第四实施例的摄像光学镜头40的RMS光斑直径在第一象限内的情况，根据图8可知，第四实施方式的摄像光学镜头40能够实现良好的成像品质。
以下表13按照上述条件式列出了本实施方式中对应各条件式的数值。显然，本实施方式的摄像光学系统满足上述的条件式。
在本实施方式中，所述摄像光学镜头40的入瞳直径ENPD为1.054mm，全视场像高(对角线方向)IH为6.000mm，x方向像高为4.800mm，y方向像高为3.600mm，在此矩形范围内成像效果最佳，对角线方向的视场角FOV为122.35°，x方向视场角为98.71°，y方向视场角为78.16°，摄像光学镜头40满足广角、超薄，其轴上、轴外色像差被充分补正，且具有优秀的光学特性。
【表13】
参数及条件式 实施例1 实施例2 实施例3 实施例4
f2/f6 -2.07 -1.74 -6.85 -7.31
R1/R2 -0.19 -0.28 -5.34 -5.94
f 1.800 1.800 2.084 2.107
f1 -3.724 -3.646 -3.393 -3.378
f2 9.754 9.377 -28.259 -29.895
f3 4.099 12.688 2.241 2.222
f4 3.166 2.346 10.081 10.131
f5 -5.188 -5.297 -8.413 -8.310
f6 -4.705 -5.396 4.124 4.090
f7 1.484 1.494 2.758 2.743
f8 -2.221 -2.210 -2.854 -2.820
FNO 1.80 1.80 2.00 2.00
TTL 6.164 6.198 5.183 5.104
FOV 119.99° 119.99° 121.90° 122.35°
IH 6.000 6.000 6.000 6.000
本领域的普通技术人员可以理解，上述各实施方式是实现本发明的具体实施方式，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本发明的精神和范围。

Claims (10)

  1. 一种摄像光学镜头，其特征在于，所述摄像光学镜头共包含八片透镜，八片所述透镜自物侧至像侧依序为：第一透镜，第二透镜，第三透镜，第四透镜，第五透镜，第六透镜，第七透镜以及第八透镜；
    所述第一透镜至所述第八透镜中的至少一个含自由曲面，所述第二透镜的焦距为f2，所述第六透镜的焦距为f6，所述第一透镜物侧面的曲率半径为R1，所述第一透镜像侧面的曲率半径为R2，且满足下列关系式：
    -7.50≤f2/f6≤-1.50；
    -6.00≤R1/R2≤-0.18。
  2. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第三透镜的轴上厚度为d5，所述第三透镜的像侧面到所述第四透镜的物侧面的轴上距离为d6，且满足下列关系式：
    4.00≤d5/d6≤9.00。
  3. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第一透镜的焦距为f1，所述第一透镜的轴上厚度为d1，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    -4.14≤f1/f≤-1.07；
    -1.36≤(R1+R2)/(R1-R2)≤1.07；
    0.03≤d1/TTL≤0.14。
  4. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第二透镜物侧面的曲率半径为R3，所述第二透镜像侧面的曲率半径为R4，所述第二透镜的轴上厚度为d3，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    -28.38≤f2/f≤8.13；
    -12.87≤(R3+R4)/(R3-R4)≤18.86；
    0.02≤d3/TTL≤0.07。
  5. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第三透镜的焦距为f3，所述第三透镜物侧面的曲率半径为R5，所述第三透镜像侧面的曲率半径为R6，所述第三透镜的轴上厚度为d5，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    0.53≤f3/f≤10.57；
    -6.72≤(R5+R6)/(R5-R6)≤-0.10；
    0.02≤d5/TTL≤0.12。
  6. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第四透镜的焦距为f4，所述第四透镜物侧面的曲率半径为R7，所述第四透镜像侧面的曲率半径为R8，所述第四透镜的轴上厚度为d7，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    0.65≤f4/f≤7.26；
    0.14≤(R7+R8)/(R7-R8)≤6.79；
    0.03≤d7/TTL≤0.15。
  7. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第五透镜的焦距为f5，所述第五透镜物侧面的曲率半径为R9，所述第五透镜像侧面的曲率半径为R10，所述第五透镜的轴上厚度为d9，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    -8.07≤f5/f≤-1.92；
    0.02≤(R9+R10)/(R9-R10)≤6.14；
    0.02≤d9/TTL≤0.06。
  8. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第六透镜物侧面的曲率半径为R11，所述第六透镜像侧面的曲率半径为R12，所述第六透镜的轴上厚度为d11，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    -6.00≤f6/f≤2.97；
    -1.17≤(R11+R12)/(R11-R12)≤0.60；
    0.05≤d11/TTL≤0.16。
  9. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第七透镜的焦距为f7，所述第七透镜物侧面的曲率半径为R13，所述第七透镜像侧面的曲率半径为R14，所述第七透镜的轴上厚度为d13，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    0.41≤f7/f≤1.99；
    0.26≤(R13+R14)/(R13-R14)≤5.59；
    0.04≤d13/TTL≤0.20。
  10. 根据权利要求1所述的摄像光学镜头，其特征在于，所述摄像光学镜头的焦距为f，所述第八透镜的焦距为f8，所述第八透镜物侧面的曲率半径为R15，所述第八透镜像侧面的曲率半径为R16，所述第八透镜的轴上厚度为d15，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    -2.74≤f8/f≤-0.82；
    1.15≤(R15+R16)/(R15-R16)≤4.00；
    0.03≤d15/TTL≤0.16。
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