WO2022126712A1 - 摄像光学镜头 - Google Patents

摄像光学镜头 Download PDF

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Publication number
WO2022126712A1
WO2022126712A1 PCT/CN2020/139419 CN2020139419W WO2022126712A1 WO 2022126712 A1 WO2022126712 A1 WO 2022126712A1 CN 2020139419 W CN2020139419 W CN 2020139419W WO 2022126712 A1 WO2022126712 A1 WO 2022126712A1
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Prior art keywords
lens
imaging optical
optical lens
ttl
object side
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PCT/CN2020/139419
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English (en)
French (fr)
Inventor
生沼健司
张磊
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诚瑞光学(深圳)有限公司
常州市瑞泰光电有限公司
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Publication of WO2022126712A1 publication Critical patent/WO2022126712A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • 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
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only

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 has good optical performance and at the same time meets the design requirements of large aperture, ultra-thinning, and wide-angle.
  • an imaging optical lens the imaging optical lens includes a total of six lenses, and the six lenses are sequentially from the object side to the image side: a first lens, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power;
  • the focal length of the imaging optical lens is f
  • the focal length of the second lens is f2
  • the focal length of the fourth lens is f4
  • the focal length of the fifth lens is f5
  • the focal length of the object side of the second lens is f2.
  • the central radius of curvature is R3, the central radius of curvature of the object side surface of the third lens is R5, and the following relational expressions are satisfied: -6.00 ⁇ f4/f5 ⁇ -2.00; R5/R3 ⁇ -50.00; 3.00 ⁇ f2/f ⁇ 6.00 .
  • the image side of the first lens is concave at the paraxial position; the focal length of the first lens is f1, the central radius of curvature of the object side of the first lens is R1, and the image side of the first lens is The central curvature radius is R2, the on-axis thickness of the first lens is d1, the optical total length of the imaging optical lens is TTL, and the following relationship is satisfied: -6.48 ⁇ f1/f ⁇ -1.51; -1.42 ⁇ (R1 +R2)/(R1-R2) ⁇ 1.62; 0.03 ⁇ d1/TTL ⁇ 0.13.
  • the imaging optical lens satisfies the following relationship: -4.05 ⁇ f1/f ⁇ -1.89; -0.89 ⁇ (R1+R2)/(R1-R2) ⁇ 1.29; 0.05 ⁇ d1/TTL ⁇ 0.10.
  • the object side of the second lens is convex at the paraxial position, and the image side of the second lens is concave at the paraxial position; the central radius of curvature of the image side of the second lens is R4, and the first
  • the axial thickness of the two lenses is d3, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -11.37 ⁇ (R3+R4)/(R3-R4) ⁇ -2.22; 0.02 ⁇ d3/TTL ⁇ 0.08.
  • the imaging optical lens satisfies the following relationship: -7.11 ⁇ (R3+R4)/(R3-R4) ⁇ -2.78; 0.04 ⁇ d3/TTL ⁇ 0.06.
  • the object side of the third lens is concave at the paraxial position, and the image side of the third lens is convex at the paraxial position; the focal length of the third lens is f3, and the image side of the third lens is f3.
  • the central radius of curvature of the lens is R6, the on-axis thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.54 ⁇ f3/f ⁇ 2.36; 0.50 ⁇ (R5+R6 )/(R5-R6) ⁇ 1.54; 0.05 ⁇ d5/TTL ⁇ 0.15.
  • the imaging optical lens satisfies the following relationship: 0.87 ⁇ f3/f ⁇ 1.89;
  • the image side of the fourth lens is concave at the paraxial position; the central radius of curvature of the object side of the fourth lens is R7, the central radius of curvature of the image side of the fourth lens is R8, and the fourth lens
  • the on-axis thickness of the lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -8.78 ⁇ f4/f ⁇ -1.03; -0.10 ⁇ (R7+R8)/(R7-R8) ⁇ 5.84; 0.02 ⁇ d7/TTL ⁇ 0.07.
  • the imaging optical lens satisfies the following relationship: -5.49 ⁇ f4/f ⁇ -1.29; -0.07 ⁇ (R7+R8)/(R7-R8) ⁇ 4.67; 0.03 ⁇ d7/TTL ⁇ 0.06.
  • the object side of the fifth lens is concave at the paraxial position, and the image side of the fifth lens is convex at the paraxial position;
  • the central radius of curvature of the object side of the fifth lens is R9, and the The central curvature radius of the five-lens image side surface is R10, the on-axis thickness of the fifth lens is d9, and the optical total length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.35 ⁇ f5/f ⁇ 1.11; 0.52 ⁇ (R9+R10)/(R9-R10) ⁇ 2.27; 0.10 ⁇ d9/TTL ⁇ 0.39.
  • the imaging optical lens satisfies the following relationship: 0.57 ⁇ f5/f ⁇ 0.89; 0.84 ⁇ (R9+R10)/(R9-R10) ⁇ 1.82; 0.17 ⁇ d9/TTL ⁇ 0.31.
  • the object side of the sixth lens is convex at the paraxial position, and the image side of the sixth lens is concave at the paraxial position;
  • the focal length of the sixth lens is f6, and the object side of the sixth lens is
  • the central radius of curvature of the sixth lens is R11
  • the central radius of curvature of the image side of the sixth lens is R12
  • the on-axis thickness of the sixth lens is d11
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -2.22 ⁇ f6/f ⁇ -0.63; 0.96 ⁇ (R11+R12)/(R11-R12) ⁇ 3.30; 0.04 ⁇ d11/TTL ⁇ 0.17.
  • the imaging optical lens satisfies the following relationship: -1.39 ⁇ f6/f ⁇ -0.78; 1.53 ⁇ (R11+R12)/(R11-R12) ⁇ 2.64; 0.07 ⁇ d11/TTL ⁇ 0.14.
  • the image height of the imaging optical lens is IH
  • the optical total length of the imaging optical lens is TTL
  • the following relational formula is satisfied: TTL/IH ⁇ 1.77.
  • the imaging optical lens satisfies the following relationship: TTL/IH ⁇ 1.72.
  • the FOV of the imaging optical lens is greater than or equal to 112.96°.
  • the FOV of the imaging optical lens is greater than or equal to 114.11°.
  • the aperture value FNO of the imaging optical lens is less than or equal to 2.52.
  • the aperture value FNO of the imaging optical lens is less than or equal to 2.47.
  • the combined focal length of the first lens and the second lens is f12, and satisfies the following relational formula: -28.14 ⁇ f12/f ⁇ -2.93.
  • the imaging optical lens according to the present invention has excellent optical properties, and has the characteristics of large aperture, wide angle, and ultra-thinness, and is especially suitable for high-pixel CCD, CMOS and other imaging elements.
  • 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 axial aberration schematic diagram of the imaging optical lens shown in Fig. 1;
  • FIG. 3 is a schematic diagram of the magnification chromatic aberration 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 structural diagram of an imaging optical lens according to a second embodiment of the present invention.
  • Fig. 6 is the axial aberration schematic diagram of the imaging optical lens shown in Fig. 5;
  • FIG. 7 is a schematic diagram of the magnification chromatic aberration 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 structural diagram 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 magnification chromatic aberration 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, and the imaging optical lens 10 includes a total of six lenses.
  • the imaging optical lens 10 from the object side to the image side, is: 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.
  • Optical elements such as an optical filter GF may be provided between the sixth lens L6 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 Made of plastic.
  • each lens may also be made of other materials.
  • the focal length of the fourth lens is defined as f4, and the focal length of the fifth lens is f5, which satisfy the following relationship: -6.00 ⁇ f4/f5 ⁇ -2.00, which specifies the focal length of the fourth lens L4
  • the ratio of f4 to the focal length f5 of the fifth lens L5 can effectively reduce the sensitivity of the optical lens group for the camera and further improve the image quality.
  • the central radius of curvature of the object side of the second lens L2 is defined as R3, and the central radius of curvature of the object side of the third lens L3 is R5, which satisfies the following relationship: R5/R3 ⁇ -50.00, by controlling the third lens L3
  • the ratio of the central curvature radius R5 of the object side surface to the central curvature radius R3 of the object side surface of the second lens L2 can prevent the shape of the third lens L3 from being too curved, which is beneficial to improve the processability of the processing and molding of the third lens L3.
  • the focal length of the imaging optical lens 10 as f
  • the focal length of the second lens L2 as f2
  • the focal length of the second lens L2 which satisfies the following relationship: 3.00 ⁇ f2/f ⁇ 6.00, by controlling the positive refractive power of the second lens L2 within a reasonable range , which is beneficial to correct the aberrations of the optical system.
  • the object side surface of the first lens is convex at the paraxial position
  • the image side surface is concave at the paraxial position
  • the first lens L1 has a negative refractive power.
  • the object side surface and the image side surface of the first lens L1 can also be set to other concave and convex distributions.
  • the focal length of the imaging optical lens 10 is defined as f, and the focal length of the first lens L1 is f1, which satisfies the following relationship: -6.48 ⁇ f1/f ⁇ -1.51, which specifies the difference between the focal length of the first lens L1 and the overall focal length ratio.
  • the first lens L1 has an appropriate negative refractive power, which is conducive to reducing system aberrations, and at the same time, is conducive to the development of ultra-thin and wide-angle lenses.
  • -4.05 ⁇ f1/f ⁇ -1.89 is satisfied.
  • the central radius of curvature of the object side surface of the first lens L1 is R1, and the central radius of curvature of the image side surface of the first lens L1 is R2, which satisfy the following relationship: -1.42 ⁇ (R1+R2)/(R1-R2) ⁇ 1.62.
  • the shape of the first lens L1 is reasonably controlled, so that the first lens L1 can effectively correct the spherical aberration of the system.
  • -0.89 ⁇ (R1+R2)/(R1-R2) ⁇ 1.29 is satisfied.
  • the axial thickness of the first lens L1 is d1
  • the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.03 ⁇ d1/TTL ⁇ 0.13, within the range of the conditional formula, is conducive to realizing ultra-thinning.
  • 0.05 ⁇ d1/TTL ⁇ 0.10 is satisfied.
  • the object side surface of the second lens L2 is convex at the paraxial position
  • the image side surface is concave at the paraxial position
  • the second lens L2 has a positive refractive power.
  • the object side surface and the image side surface of the second lens L2 can also be set to other concave and convex distributions.
  • the central curvature radius of the image side surface of the second lens L2 is defined as R4, which satisfies the following relationship: -11.37 ⁇ (R3+R4)/(R3-R4) ⁇ -2.22, which specifies the shape of the second lens L2, in the range As the lens develops to ultra-thin and wide-angle, it is beneficial to correct the problem of axial chromatic aberration. Preferably, -7.11 ⁇ (R3+R4)/(R3-R4) ⁇ -2.78 is satisfied.
  • the axial thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.02 ⁇ d3/TTL ⁇ 0.08, within the range of the conditional formula, is conducive to realizing ultra-thinning .
  • 0.04 ⁇ d3/TTL ⁇ 0.06 is satisfied.
  • the object side surface of the third lens L3 is concave at the paraxial position
  • the image side surface is convex at the paraxial position
  • the third lens L3 has a positive refractive power.
  • the object side surface and the image side surface of the third lens L3 can also be set to other concave and convex distributions.
  • the focal length of the imaging optical lens 10 is defined as f, and the focal length of the third lens L3 is f3, which satisfies the following relationship: 0.54 ⁇ f3/f ⁇ 2.36, through the reasonable distribution of the optical power, the system has a better Imaging quality and lower sensitivity. Preferably, 0.87 ⁇ f3/f ⁇ 1.89 is satisfied.
  • the central radius of curvature of the image side surface of the third lens L3 is R6, which satisfies the following relationship: 0.50 ⁇ (R5+R6)/(R5-R6) ⁇ 1.54, which specifies the shape of the third lens L3, which is beneficial to the third lens L3 molding, within the range specified by the conditional formula, can ease the degree of deflection of light passing through the lens and effectively reduce aberrations.
  • 0.80 ⁇ (R5+R6)/(R5-R6) ⁇ 1.23 is satisfied.
  • the axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.05 ⁇ d5/TTL ⁇ 0.15, within the range of the conditional formula, it is beneficial to realize ultra-thinning .
  • 0.07 ⁇ d5/TTL ⁇ 0.12 is satisfied.
  • the object side surface of the fourth lens L4 is convex at the paraxial position
  • the image side surface is concave at the paraxial position
  • the fourth lens L4 has a negative refractive power.
  • the object side surface and the image side surface of the fourth lens L4 can also be set to other concave and convex distributions.
  • the focal length of the imaging optical lens 10 is defined as f, and the focal length of the fourth lens is f4, which satisfies the following relationship: -8.78 ⁇ f4/f ⁇ -1.03, through the reasonable distribution of optical power, the system has a better high imaging quality and lower sensitivity. Preferably, -5.49 ⁇ f4/f ⁇ -1.29 is satisfied.
  • the central radius of curvature of the object side of the fourth lens L4 is R7
  • the central radius of curvature of the image side of the fourth lens L4 is R8, and the following relationship is satisfied: -0.10 ⁇ (R7+R8)/(R7-R8 ) ⁇ 5.84, which specifies the shape of the fourth lens L4.
  • -0.07 ⁇ (R7+R8)/(R7-R8) ⁇ 4.67 is satisfied.
  • the axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.02 ⁇ d7/TTL ⁇ 0.07, within the range of the conditional formula, it is beneficial to realize ultra-thinning .
  • 0.03 ⁇ d7/TTL ⁇ 0.06 is satisfied.
  • the object side surface of the fifth lens L5 is concave at the paraxial position
  • the image side surface is convex at the paraxial position
  • the fifth lens L5 has a positive refractive power.
  • the object side surface and the image side surface of the fifth lens L5 can also be set to other concave and convex distributions.
  • the focal length of the imaging optical lens 10 is defined as f
  • the focal length of the fifth lens is f5, which satisfies the following relationship: 0.35 ⁇ f5/f ⁇ 1.11, the limitation of the fifth lens L5 can effectively make the imaging optical lens 10
  • the light angle is gentle, reducing tolerance sensitivity.
  • 0.57 ⁇ f5/f ⁇ 0.89 is satisfied.
  • the central radius of curvature of the object side of the fifth lens L5 is R9
  • the central radius of curvature of the image side of the fifth lens L5 is R10
  • the following relationship is satisfied: 0.52 ⁇ (R9+R10)/(R9-R10) ⁇ 2.27
  • the shape of the fifth lens L5 is specified.
  • the shape is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct problems such as aberrations of off-axis picture angles.
  • 0.84 ⁇ (R9+R10)/(R9-R10) ⁇ 1.82 is satisfied.
  • the axial thickness of the fifth lens L5 is d9, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.10 ⁇ d9/TTL ⁇ 0.39, within the range of the conditional formula, it is beneficial to realize ultra-thinning .
  • 0.17 ⁇ d9/TTL ⁇ 0.31 is satisfied.
  • the object side surface of the sixth lens L6 is convex at the paraxial position
  • the image side surface is concave at the paraxial position
  • the sixth lens L6 has a negative refractive power.
  • the object side surface and the image side surface of the sixth lens L6 can also be set to other concave and convex distributions.
  • the focal length of the imaging optical lens 10 is defined as f, and the focal length of the sixth lens L6 is f6, which satisfies the following relationship: -2.22 ⁇ f6/f ⁇ -0.63. Best image quality and lower sensitivity. Preferably, -1.39 ⁇ f6/f ⁇ -0.78 is satisfied.
  • the central radius of curvature of the object side of the sixth lens L6 is R11
  • the central radius of curvature of the image side of the sixth lens L6 is R12
  • the following relationship is satisfied: 0.96 ⁇ (R11+R12)/(R11-R12) ⁇ 3.30
  • the shape of the sixth lens L6 is specified.
  • the shape of the sixth 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.
  • 1.53 ⁇ (R11+R12)/(R11-R12) ⁇ 2.64 is satisfied.
  • the axial thickness of the sixth lens L6 is d11, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.04 ⁇ d11/TTL ⁇ 0.17, within the range of the conditional expression, is conducive to realizing ultra-thinning .
  • 0.07 ⁇ d11/TTL ⁇ 0.14 is satisfied.
  • the image height of the imaging optical lens 10 is IH
  • the total optical length of the imaging optical lens 10 is TTL
  • the following relational expression is satisfied: TTL/IH ⁇ 1.77, which is conducive to realizing ultra-thinning.
  • TTL/IH ⁇ 1.72 is satisfied.
  • the field of view FOV of the imaging optical lens 10 is greater than or equal to 112.96°, so as to achieve a wider angle.
  • the FOV of the imaging optical lens 10 is greater than or equal to 114.11°.
  • the aperture value FNO of the imaging optical lens 10 is less than or equal to 2.52, so as to achieve a large aperture, and the imaging optical lens has good imaging performance.
  • the aperture value FNO of the imaging optical lens 10 is less than or equal to 2.47.
  • the focal length of the imaging optical lens 10 is f
  • the combined focal length of the first lens L1 and the second lens L2 is f12
  • the following relationship is satisfied: -28.14 ⁇ f12/f ⁇ -2.93 .
  • the aberration and distortion of the imaging optical lens 10 can be eliminated, and the back focal length of the imaging optical lens 10 can be suppressed, and the miniaturization of the imaging lens system group can be maintained.
  • -17.59 ⁇ f12/f ⁇ -3.66 is satisfied.
  • the imaging optical lens 10 has good optical performance, it can meet the design requirements of large aperture, wide angle, and ultra-thinning; according to the characteristics of the imaging optical lens 10, the imaging optical lens 10 is especially suitable for CCDs, Mobile phone camera lens assembly and WEB camera lens composed of camera components such as CMOS.
  • 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 unit of focal length, on-axis distance, center curvature radius, on-axis thickness, inflection point position, and stagnation point position is mm.
  • TTL total optical length (the on-axis distance from the object side of the first lens L1 to the image plane Si), in mm;
  • Aperture value FNO refers to the ratio of the effective focal length of the imaging optical lens to the diameter of the entrance pupil.
  • an inflection point and/or a stagnation point may also be set on the object side and/or the image side of the lens to meet high-quality imaging requirements.
  • an inflection point and/or a stagnation point may also be set on the object side and/or the image side of the lens to meet high-quality imaging requirements.
  • 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 at the center of the optical surface
  • R1 the central radius of curvature of the object side surface of the first lens L1;
  • R2 the central curvature radius of the image side surface of the first lens L1;
  • R3 the central radius of curvature of the object side surface of the second lens L2;
  • R4 the central curvature radius of the image side surface of the second lens L2;
  • R5 the central radius of curvature of the object side surface of the third lens L3;
  • R6 the central curvature radius of the image side surface of the third lens L3;
  • R7 the central curvature radius of the object side surface of the fourth lens L4;
  • R8 the central curvature radius of the image side surface of the fourth lens L4;
  • R9 the central curvature radius of the object side surface of the fifth lens L5;
  • R10 the central curvature radius of the image side surface of the fifth lens L5;
  • R11 the central curvature radius of the object side surface of the sixth lens L6;
  • R12 the central curvature radius of the image side surface of the sixth lens L6;
  • R13 the central curvature radius of the object side of the optical filter GF
  • R14 the central curvature radius of the image side of the optical filter GF
  • d the on-axis thickness of the lens, the on-axis distance between the lenses
  • d0 the on-axis distance from the aperture S1 to the object side surface of the first lens L1;
  • d2 the on-axis distance from the image side of the first lens L1 to the object side of the second lens L2;
  • 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 optical filter GF;
  • nd the refractive index of the d line (the d line is green light with a wavelength of 550 nm);
  • 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;
  • 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.
  • the aspherical surface shown in the following 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).
  • 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).
  • Table 3 and Table 4 show the design data of the inflection point and the stagnation point of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
  • P1R1 and P1R2 respectively represent the object side and image side of the first lens L1
  • P2R1 and P2R2 respectively represent the object side and image side of the second lens L2
  • P3R1 and P3R2 respectively represent the object side and the image side of the third lens L3
  • P4R1 and P4R2 respectively represent the object side and image side of the fourth lens L4
  • P5R1 and P5R2 respectively represent the object side and the image side of the fifth lens L5
  • P6R1 and P6R2 respectively represent the object side and the image side of the sixth lens L6.
  • the corresponding data in the column of "invagination point position” is the vertical distance from the inflexion point set on the surface of each lens to the optical axis of the imaging optical lens 10 .
  • the corresponding data in the column of "stagnation point position” is the vertical distance from the stagnation 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 the 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 meridional direction. .
  • Table 13 shows the values corresponding to various numerical values in the first, second, and third embodiments 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 0.971 mm
  • the image height IH of the full field of view is 3.500 mm
  • the FOV in the diagonal direction is 115.69°.
  • the imaging optical lens 10 It meets the design requirements of large aperture, wide-angle, and ultra-thin, and its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • 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 object side of the first lens is concave at the paraxial position.
  • FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.
  • Table 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • FIG. 6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 470 nm, 555 nm and 650 nm passes 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 555 nm passes through the imaging optical lens 20 of the second embodiment.
  • the field curvature S in FIG. 8 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.
  • the second embodiment satisfies each conditional expression.
  • the entrance pupil diameter ENPD of the imaging optical lens 20 is 0.971 mm, the full field of view image height IH is 3.500 mm, and the FOV in the diagonal direction is 115.69°.
  • the imaging optical lens 20 It meets the design requirements of large aperture, wide-angle, and ultra-thin, and its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • 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 object side of the first lens is concave at the paraxial position
  • the object side of the fourth lens is concave at the paraxial position
  • FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.
  • Table 9 and Table 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 11 and Table 12 show the inflection point and stagnation point design data of each lens in the imaging optical lens 30 according to 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 with wavelengths of 470 nm, 555 nm and 650 nm passes 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 555 nm passes through the imaging optical lens 30 of the third embodiment.
  • the field curvature S in FIG. 12 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.
  • Table 13 lists the numerical values corresponding to each conditional expression in the present embodiment according to the above-mentioned conditional expression. Obviously, the imaging optical lens 30 of the present embodiment satisfies the above-mentioned conditional expression.
  • the entrance pupil diameter ENPD of the imaging optical lens 30 is 0.911 mm
  • the full field of view image height IH is 3.500 mm
  • the field of view angle FOV in the diagonal direction is 115.74°.
  • the imaging optical lens 30 It meets the design requirements of large aperture, wide-angle, and ultra-thin, and its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • Example 2 Example 3 f4/f5 -5.95 -4.53 -2.10 R5/R3 -1854.52 -363.80 -51.00 f2/f 5.99 4.55 3.10 f 2.233 2.233 2.232 f1 -5.624 -5.552 -5.055 f2 13.383 10.166 6.922 f3 2.962 2.938 2.429 f4 -9.807 -7.477 -3.447 f5 1.648 1.651 1.641 f6 -2.131 -2.209 -2.475 FNO 2.30 2.30 2.45 TTL 5.892 5.892 5.890 IH 3.500 3.500 3.500 FOV 115.69° 115.69° 115.74°

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Abstract

一种摄像光学镜头(10)，共包含六片透镜，自物侧至像侧依序为：具有负屈折力的第一透镜(L1)，具有正屈折力的第二透镜(L2)，具有正屈折力的第三透镜(L3)，具有负屈折力的第四透镜(L4)，具有正屈折力的第五透镜(L5)，以及具有负屈折力的第六透镜(L6)；其中，摄像光学镜头(10)的焦距为f，第二透镜(L2)的焦距为f2，第四透镜(L4)的焦距为f4，第五透镜(L5)的焦距为f5，第二透镜(L2)物侧面的中心曲率半径为R3，第三透镜(L3)物侧面的中心曲率半径为R5，且满足下列关系式：-6.00≤f4/f5≤-2.00；R5/R3≤-50.00；3.00≤f2/f≤6.00。摄像光学镜头(10)具有良好光学性能的同时，能够满足大光圈、广角化、超薄化的设计要求。

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
近年来，随着各种智能设备的兴起，小型化摄像光学镜头的需求日渐提高，且由于感光器件的像素尺寸缩小，再加上现今电子产品以功能佳且轻薄便携的外型为发展趋势，因此，具备良好成像品质的小型化摄像光学镜头俨然成为目前市场上的主流。为获得较佳的成像品质，多采用多片式透镜结构。并且，随着技术的发展以及用户多样化需求的增多，在感光器件的像素面积不断缩小，且系统对成像品质的要求不断提高的情况下，六片式透镜结构逐渐出现在镜头设计当中。迫切需要具有优秀的光学特征、体积小且像差被充分补正的广角摄像镜头。
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，满足大光圈、超薄化、广角化的设计要求。
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六片透镜，所述六片透镜自物侧至像侧依序为：具有负屈折力的第一透镜，具有正屈折力的第二透镜，具有正屈折力的第三透镜，具有负屈折力的第四透镜，具有正屈折力的第五透镜，以及具有负屈折力的第六透镜；其中，所述摄像光学镜头的焦距为f，所述第二透镜的焦距为f2，所述第四透镜的焦距为f4，所述第五透镜的焦距为f5，所述第二透镜物侧面的中心曲率半径为R3，所述第三透镜物侧面的中心曲率半径为R5，且满足下列关系式：-6.00≤f4/f5≤-2.00；R5/R3≤-50.00；3.00≤f2/f≤6.00。
优选的，所述第一透镜的像侧面于近轴处为凹面；所述第一透镜的焦距为f1，所述第一透镜物侧面的中心曲率半径为R1，所述第一透镜像侧面的中心曲率半径为R2，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：-6.48≤f1/f≤-1.51；-1.42≤(R1+R2)/(R1-R2)≤1.62；0.03≤d1/TTL≤0.13。
优选的，所述摄像光学镜头满足下列关系式：-4.05≤f1/f≤-1.89；-0.89≤(R1+R2)/(R1-R2)≤1.29；0.05≤d1/TTL≤0.10。
优选的，所述第二透镜的物侧面于近轴处为凸面，所述第二透镜的像侧面于近轴处为凹 面；所述第二透镜像侧面的中心曲率半径为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：-11.37≤(R3+R4)/(R3-R4)≤-2.22；0.02≤d3/TTL≤0.08。
优选的，所述摄像光学镜头满足下列关系式：-7.11≤(R3+R4)/(R3-R4)≤-2.78；0.04≤d3/TTL≤0.06。
优选的，所述第三透镜的物侧面于近轴处为凹面，所述第三透镜的像侧面于近轴处为凸面；所述第三透镜的焦距为f3，所述第三透镜像侧面的中心曲率半径为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：0.54≤f3/f≤2.36；0.50≤(R5+R6)/(R5-R6)≤1.54；0.05≤d5/TTL≤0.15。
优选的，所述摄像光学镜头满足下列关系式：0.87≤f3/f≤1.89；
0.80≤(R5+R6)/(R5-R6)≤1.23；0.07≤d5/TTL≤0.12。
优选的，所述第四透镜的像侧面于近轴处为凹面；所述第四透镜物侧面的中心曲率半径为R7，所述第四透镜像侧面的中心曲率半径为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：-8.78≤f4/f≤-1.03；-0.10≤(R7+R8)/(R7-R8)≤5.84；0.02≤d7/TTL≤0.07。
优选的，所述摄像光学镜头满足下列关系式：-5.49≤f4/f≤-1.29；-0.07≤(R7+R8)/(R7-R8)≤4.67；0.03≤d7/TTL≤0.06。
优选的，所述第五透镜的物侧面于近轴处为凹面，所述第五透镜的像侧面于近轴处为凸面；所述第五透镜物侧面的中心曲率半径为R9，所述第五透镜像侧面的中心曲率半径为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：0.35≤f5/f≤1.11；0.52≤(R9+R10)/(R9-R10)≤2.27；0.10≤d9/TTL≤0.39。
优选的，所述摄像光学镜头满足下列关系式：0.57≤f5/f≤0.89；0.84≤(R9+R10)/(R9-R10)≤1.82；0.17≤d9/TTL≤0.31。
优选的，所述第六透镜的物侧面于近轴处为凸面，所述第六透镜的像侧面于近轴处为凹面；所述第六透镜的焦距为f6，所述第六透镜物侧面的中心曲率半径为R11，所述第六透镜像侧面的中心曲率半径为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：-2.22≤f6/f≤-0.63；0.96≤(R11+R12)/(R11-R12)≤3.30；0.04≤d11/TTL≤0.17。
优选的，所述摄像光学镜头满足下列关系式：-1.39≤f6/f≤-0.78；1.53≤(R11+R12)/(R11-R12)≤2.64；0.07≤d11/TTL≤0.14。
优选的，所述摄像光学镜头的像高为IH，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：TTL/IH≤1.77。
优选的，所述摄像光学镜头满足下列关系式：TTL/IH≤1.72。
优选的，所述摄像光学镜头的视场角FOV大于或等于112.96°。
优选的，所述摄像光学镜头的视场角FOV大于或等于114.11°。
优选的，所述摄像光学镜头的光圈值FNO小于或等于2.52。
优选的，所述摄像光学镜头的光圈值FNO小于或等于2.47。
优选的，所述第一透镜与所述第二透镜的组合焦距为f12，且满足下列关系式：-28.14≤f12/f≤-2.93。
本发明的有益效果在于：根据本发明的摄像光学镜头具有优秀的光学特性，且具有大光圈、广角化、超薄化的特性，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轴向像差示意图；
图3是图1所示摄像光学镜头的倍率色差示意图；
图4是图1所示摄像光学镜头的场曲及畸变示意图；
图5是本发明第二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轴向像差示意图；
图7是图5所示摄像光学镜头的倍率色差示意图；
图8是图5所示摄像光学镜头的场曲及畸变示意图；
图9是本发明第三实施方式的摄像光学镜头的结构示意图；
图10是图9所示摄像光学镜头的轴向像差示意图；
图11是图9所示摄像光学镜头的倍率色差示意图；
图12是图9所示摄像光学镜头的场曲及畸变示意图。
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共包含六个透镜。具体的，所述摄像光学镜头10，由物侧至像侧依序为：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。第六透镜L6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。在其他可选的实施方式中，各透镜也可以是其他材质。
在本实施方式中，定义所述第四透镜的焦距为f4，所述第五透镜的焦距为f5，满足下列关系式：-6.00≤f4/f5≤-2.00，规定了第四透镜L4的焦距f4与第五透镜L5的焦距f5的比值，可有效降低摄像头用光学透镜组的敏感度，进一步提升成像质量。
定义所述第二透镜L2物侧面的中心曲率半径为R3，所述第三透镜L3物侧面的中心曲率半径为R5，满足下列关系式：R5/R3≤-50.00，通过控制第三透镜L3的物侧面的中心曲率半径R5与第二透镜L2的物侧面的中心曲率半径R3的比值，可以防止第三透镜L3的形态过于弯曲，有利于提升第三透镜L3的加工成型的工艺性，此处还有利于降低光学成像系统的像差。
定义所述摄像光学镜头10的焦距为f，所述第二透镜L2的焦距为f2，满足下列关系式：3.00≤f2/f≤6.00，通过将第二透镜L2的正光焦度控制在合理范围，有利于矫正光学系统的像差。
本实施方式中，所述第一透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面，第一透镜L1具有负屈折力。在其他可选的实施方式中，第一透镜L1的物侧面和像侧面也可设置为其他凹、凸分布情况。
定义所述摄像光学镜头10的焦距为f，所述第一透镜L1的焦距为f1，满足下列关系式：-6.48≤f1/f≤-1.51，规定了第一透镜L1的焦距与整体焦距的比值。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。优选的，满足-4.05≤f1/f≤-1.89。
所述第一透镜L1物侧面的中心曲率半径为R1，所述第一透镜L1像侧面的中心曲率半径为R2，满足下列关系式：-1.42≤(R1+R2)/(R1-R2)≤1.62，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-0.89≤(R1+R2)/(R1-R2)≤1.29。
所述第一透镜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≤0.13，在条件式范围内，有利于实现超薄化。优选地，满足0.05≤d1/TTL≤0.10。
本实施方式中，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，第二透镜L2具有正屈折力。在其他可选的实施方式中，第二透镜L2的物侧面和像侧面也可设置为其他凹、凸分布情况。
定义所述第二透镜L2像侧面的中心曲率半径为R4，满足下列关系式：-11.37≤(R3+R4)/(R3-R4)≤-2.22，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-7.11≤(R3+R4)/(R3-R4)≤-2.78。
所述第二透镜L2的轴上厚度为d3，所述摄像光学镜头10的光学总长为TTL，满足下列关系式：0.02≤d3/TTL≤0.08，在条件式范围内，有利于实现超薄化。优选地，满足0.04≤d3/TTL≤0.06。
本实施方式中，第三透镜L3的物侧面于近轴处为凹面，像侧面于近轴处为凸面，第三透镜L3具有正屈折力。在其他可选的实施方式中，第三透镜L3的物侧面和像侧面也可设置为其他凹、凸分布情况。
定义所述摄像光学镜头10的焦距为f，所述第三透镜L3的焦距为f3，满足下列关系式：0.54≤f3/f≤2.36，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0.87≤f3/f≤1.89。
所述第三透镜L3像侧面的中心曲率半径为R6，满足下列关系式：0.50≤(R5+R6)/(R5-R6)≤1.54，规定了第三透镜L3的形状，有利于第三透镜L3成型，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0.80≤(R5+R6)/(R5-R6)≤1.23。
所述第三透镜L3的轴上厚度为d5，所述摄像光学镜头10的光学总长为TTL，满足下列关系式：0.05≤d5/TTL≤0.15，在条件式范围内，有利于实现超薄化。优选地，满足0.07≤d5/TTL≤0.12。
本实施方式中，第四透镜L4的物侧面于近轴处为凸面，像侧面于近轴处为凹面，第四透镜L4具有负屈折力。在其他可选的实施方式中，第四透镜L4的物侧面和像侧面也可设置为其他凹、凸分布情况。
定义所述摄像光学镜头10的焦距为f，所述第四透镜的焦距为f4，满足下列关系式： -8.78≤f4/f≤-1.03，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-5.49≤f4/f≤-1.29。
所述第四透镜L4物侧面的中心曲率半径为R7，以及所述第四透镜L4像侧面的中心曲率半径为R8，且满足下列关系式：-0.10≤(R7+R8)/(R7-R8)≤5.84，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-0.07≤(R7+R8)/(R7-R8)≤4.67。
所述第四透镜L4的轴上厚度为d7，所述摄像光学镜头10的光学总长为TTL，满足下列关系式：0.02≤d7/TTL≤0.07，在条件式范围内，有利于实现超薄化。优选地，满足0.03≤d7/TTL≤0.06。
本实施方式中，第五透镜L5的物侧面于近轴处为凹面，像侧面于近轴处为凸面，第五透镜L5具有正屈折力。在其他可选的实施方式中，第五透镜L5的物侧面和像侧面也可设置为其他凹、凸分布情况。定义所述摄像光学镜头10的焦距为f，所述第五透镜的焦距为f5，满足下列关系式：0.35≤f5/f≤1.11，对第五透镜L5的限定可有效的使得摄像光学镜头10的光线角度平缓，降低公差敏感度。优选地，满足0.57≤f5/f≤0.89。
所述第五透镜L5物侧面的中心曲率半径为R9，所述第五透镜L5像侧面的中心曲率半径为R10，且满足下列关系式：0.52≤(R9+R10)/(R9-R10)≤2.27，规定了第五透镜L5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0.84≤(R9+R10)/(R9-R10)≤1.82。
所述第五透镜L5的轴上厚度为d9，所述摄像光学镜头10的光学总长为TTL，满足下列关系式：0.10≤d9/TTL≤0.39，在条件式范围内，有利于实现超薄化。优选地，满足0.17≤d9/TTL≤0.31。
本实施方式中，第六透镜L6的物侧面于近轴处为凸面，像侧面于近轴处为凹面，第六透镜L6具有负屈折力。在其他可选的实施方式中，第六透镜L6的物侧面和像侧面也可设置为其他凹、凸分布情况。
定义所述摄像光学镜头10的焦距为f，所述第六透镜L6的焦距为f6，满足下列关系式：-2.22≤f6/f≤-0.63，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-1.39≤f6/f≤-0.78。
所述第六透镜L6物侧面的中心曲率半径为R11，所述第六透镜L6像侧面的中心曲率半径为R12，且满足下列关系式：0.96≤(R11+R12)/(R11-R12)≤3.30，规定了第六透镜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1.53≤(R11+R12)/(R11-R12)≤2.64。
所述第六透镜L6的轴上厚度为d11，所述摄像光学镜头10的光学总长为TTL，满足下 列关系式：0.04≤d11/TTL≤0.17，在条件式范围内，有利于实现超薄化。优选地，满足0.07≤d11/TTL≤0.14。
本实施方式中，所述摄像光学镜头10的像高为IH，所述摄像光学镜头10的光学总长为TTL，且满足下列关系式：TTL/IH≤1.77，从而有利于实现超薄化。优选地，满足TTL/IH≤1.72。
本实施方式中，所述摄像光学镜头10的视场角FOV大于或等于112.96°，从而实现广角化。优选的，所述摄像光学镜头10的视场角FOV大于或等于114.11°。
本实施方式中，所述摄像光学镜头10光圈值FNO小于或等于2.52，从而实现大光圈，摄像光学镜头成像性能好。优选的，摄像光学镜头10的光圈值FNO小于或等于2.47。
本实施方式中，所述摄像光学镜头10的焦距为f，所述第一透镜L1与所述第二透镜L2的组合焦距为f12，且满足下列关系式：-28.14≤f12/f≤-2.93。借此，可消除摄像光学镜头10的像差与歪曲，且可压制摄像光学镜头10后焦距，维持影像镜片系统组小型化。优选的，满足-17.59≤f12/f≤-3.66。
摄像光学镜头10具有良好光学性能的同时，能够满足大光圈、广角化、超薄化的设计要求；根据该摄像光学镜头10的特性，该摄像光学镜头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、中心曲率半径、轴上厚度、反曲点位置、驻点位置的单位为mm。
TTL：光学总长(第一透镜L1的物侧面到像面Si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。
优选的，所述透镜的物侧面和/或像侧面上还可以设置有反曲点和/或驻点，以满足高品质的成像需求，具体的可实施方案，参下所述。
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。
【表1】
Figure PCTCN2020139419-appb-000001
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的物侧面的中心曲率半径；
R2：第一透镜L1的像侧面的中心曲率半径；
R3：第二透镜L2的物侧面的中心曲率半径；
R4：第二透镜L2的像侧面的中心曲率半径；
R5：第三透镜L3的物侧面的中心曲率半径；
R6：第三透镜L3的像侧面的中心曲率半径；
R7：第四透镜L4的物侧面的中心曲率半径；
R8：第四透镜L4的像侧面的中心曲率半径；
R9：第五透镜L5的物侧面的中心曲率半径；
R10：第五透镜L5的像侧面的中心曲率半径；
R11：第六透镜L6的物侧面的中心曲率半径；
R12：第六透镜L6的像侧面的中心曲率半径；
R13：光学过滤片GF的物侧面的中心曲率半径；
R14：光学过滤片GF的像侧面的中心曲率半径；
d：透镜的轴上厚度、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的像侧面到光学过滤片GF的物侧面的轴上距离；
d13：光学过滤片GF的轴上厚度；
d14：光学过滤片GF的像侧面到像面Si的轴上距离；
nd：d线的折射率(d线为波长为550nm的绿光)；
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；
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；
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 PCTCN2020139419-appb-000002
为方便起见，各个透镜面的非球面使用下述公式(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。
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 20              (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)。
表3、表4示出本发明第一实施方式的摄像光学镜头10中各透镜的反曲点以及驻点设计数据。其中，P1R1、P1R2分别代表第一透镜L1的物侧面和像侧面，P2R1、P2R2分别代表第二透镜L2的物侧面和像侧面，P3R1、P3R2分别代表第三透镜L3的物侧面和像侧面，P4R1、P4R2分别代表第四透镜L4的物侧面和像侧面，P5R1、P5R2分别代表第五透镜L5的物侧面和像侧面，P6R1、P6R2分别代表第六透镜L6的物侧面和像侧面。“反曲点位置”栏位对应数据为各透镜表面所设置的反曲点到摄像光学镜头10光轴的垂直距离。“驻点位置”栏位对应数据为各透镜表面所设置的驻点到摄像光学镜头10光轴的垂直距离。
【表3】
  反曲点个数 反曲点位置1 反曲点位置2 反曲点位置3
P1R1 0 / / /
P1R2 1 0.975 / /
P2R1 2 0.505 0.775 /
P2R2 0 / / /
P3R1 0 / / /
P3R2 0 / / /
P4R1 1 0.205 / /
P4R2 3 0.355 0.925 1.185
P5R1 1 0.905 / /
P5R2 1 1.255 / /
P6R1 3 0.535 1.805 2.295
P6R2 1 0.625 / /
【表4】
  驻点个数 驻点位置1
P1R1 0 /
P1R2 0 /
P2R1 0 /
P2R2 0 /
P3R1 0 /
P3R2 0 /
P4R1 1 0.345
P4R2 1 0.695
P5R1 1 1.225
P5R2 1 1.625
P6R1 1 1.035
P6R2 1 1.835
图2、图3分别示出了波长为470nm、555nm及650nm的光经过第一实施方式的摄像光学镜头10后的轴向像差以及倍率色差示意图。图4则示出了波长为555nm的光经过第一实施方式的摄像光学镜头10后的场曲及畸变示意图，图4的场曲S是弧矢方向的场曲，T是子午方向的场曲。
后出现的表13示出各实施例一、二、三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，所述摄像光学镜头10的入瞳直径ENPD为0.971mm，全视场像高IH为3.500mm，对角线方向的视场角FOV为115.69°，所述摄像光学镜头10满足大光圈、广角化、超薄化的设计要求，其轴上、轴外色像差被充分补正，且具有优秀的光学特征。
(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。
第二实施方式中，第一透镜的物侧面于近轴处为凹面。
图5所示为本发明第二实施方式的摄像光学镜头20。
表5、表6示出本发明第二实施方式的摄像光学镜头20的设计数据。
【表5】
Figure PCTCN2020139419-appb-000003
表6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6】
Figure PCTCN2020139419-appb-000004
表7、表8示出本发明第二实施方式的摄像光学镜头20中各透镜的反曲点以及驻点设计数据。
【表7】
  反曲点个数 反曲点位置1 反曲点位置2 反曲点位置3
P1R1 1 0.145 / /
P1R2 1 0.975 / /
P2R1 1 0.505 / /
P2R2 0 / / /
P3R1 0 / / /
P3R2 0 / / /
P4R1 1 0.145 / /
P4R2 3 0.305 0.915 1.145
P5R1 1 0.835 / /
P5R2 1 1.215 / /
P6R1 3 0.575 1.885 2.385
P6R2 1 0.655 / /
【表8】
  驻点个数 驻点位置1
P1R1 1 0.255
P1R2 0 /
P2R1 0 /
P2R2 0 /
P3R1 0 /
P3R2 0 /
P4R1 1 0.245
P4R2 1 0.595
P5R1 1 1.215
P5R2 1 1.635
P6R1 1 1.125
P6R2 1 1.915
图6、图7分别示出了波长为470nm、555nm及650nm的光经过第二实施方式的摄像光学镜头20后的轴向像差以及倍率色差示意图。图8则示出了波长为555nm的光经过第二实施方式的摄像光学镜头20后的场曲及畸变示意图。图8的场曲S是弧矢方向的场曲，T是子午方向的场曲。
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0.971mm，全视场像高IH为3.500mm，对角线方向的视场角FOV为115.69°，所述摄像光学镜头20满足大光圈、广角化、超薄化的设计要求，其轴上、轴外色像差被充分补正，且具有优秀的光学特征。
(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。
第三实施方式中，第一透镜的物侧面于近轴处为凹面，第四透镜的物侧面于近轴处为凹面。
图9所示为本发明第三实施方式的摄像光学镜头30。
表9、表10示出本发明第三实施方式的摄像光学镜头30的设计数据。
【表9】
Figure PCTCN2020139419-appb-000005
表10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10】
Figure PCTCN2020139419-appb-000006
表11、表12示出本发明第三实施方式的摄像光学镜头30中各透镜的反曲点以及驻点设计数据。
【表11】
  反曲点个数 反曲点位置1 反曲点位置2 反曲点位置3
P1R1 2 0.235 1.695 /
P1R2 1 0.935 / /
P2R1 1 0.485 / /
P2R2 0 / / /
P3R1 0 / / /
P3R2 0 / / /
P4R1 0 / / /
P4R2 3 0.185 0.845 1.125
P5R1 1 0.785 / /
P5R2 1 1.195 / /
P6R1 3 0.655 2.005 2.445
P6R2 1 0.675 / /
【表12】
  驻点个数 驻点位置1
P1R1 1 0.415
P1R2 0 /
P2R1 0 /
P2R2 0 /
P3R1 0 /
P3R2 0 /
P4R1 0 /
P4R2 1 0.355
P5R1 1 1.195
P5R2 0 /
P6R1 1 1.275
P6R2 1 1.925
图10、图11分别示出了波长为470nm、555nm及650nm的光经过第三实施方式的摄像光学镜头30后的轴向像差以及倍率色差示意图。图12则示出了波长为555nm的光经过第三实施方式的摄像光学镜头30后的场曲及畸变示意图。图12的场曲S是弧矢方向的场曲，T是子午方向的场曲。
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镜头30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0.911mm，全视场像高IH为3.500mm，对角线方向的视场角FOV为115.74°，所述摄像光学镜头30满足大光圈、广角化、超薄化的设计要求，其轴上、轴外色像差被充分补正，且具有优秀的光学特征。
【表13】
参数及条件式 实施例1 实施例2 实施例3
f4/f5 -5.95 -4.53 -2.10
R5/R3 -1854.52 -363.80 -51.00
f2/f 5.99 4.55 3.10
f 2.233 2.233 2.232
f1 -5.624 -5.552 -5.055
f2 13.383 10.166 6.922
f3 2.962 2.938 2.429
f4 -9.807 -7.477 -3.447
f5 1.648 1.651 1.641
f6 -2.131 -2.209 -2.475
FNO 2.30 2.30 2.45
TTL 5.892 5.892 5.890
IH 3.500 3.500 3.500
FOV 115.69° 115.69° 115.74°
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 (20)

  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六片透镜，所述六片透镜自物侧至像侧依序为：具有负屈折力的第一透镜，具有正屈折力的第二透镜，具有正屈折力的第三透镜，具有负屈折力的第四透镜，具有正屈折力的第五透镜，以及具有负屈折力的第六透镜；
    其中，所述摄像光学镜头的焦距为f，所述第二透镜的焦距为f2，所述第四透镜的焦距为f4，所述第五透镜的焦距为f5，所述第二透镜物侧面的中心曲率半径为R3，所述第三透镜物侧面的中心曲率半径为R5，且满足下列关系式：
    -6.00≤f4/f5≤-2.00；
    R5/R3≤-50.00；
    3.00≤f2/f≤6.00。
  2. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第一透镜的像侧面于近轴处为凹面；
    所述第一透镜的焦距为f1，所述第一透镜物侧面的中心曲率半径为R1，所述第一透镜像侧面的中心曲率半径为R2，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：
    -6.48≤f1/f≤-1.51；
    -1.42≤(R1+R2)/(R1-R2)≤1.62；
    0.03≤d1/TTL≤0.13。
  3. 根据权利要求2所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列关系式：
    -4.05≤f1/f≤-1.89；
    -0.89≤(R1+R2)/(R1-R2)≤1.29；
    0.05≤d1/TTL≤0.10。
  4. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第二透镜的物侧面于近轴处为凸面，所述第二透镜的像侧面于近轴处为凹面；
    所述第二透镜像侧面的中心曲率半径为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：
    -11.37≤(R3+R4)/(R3-R4)≤-2.22；
    0.02≤d3/TTL≤0.08。
  5. 根据权利要求4所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列关系式：
    -7.11≤(R3+R4)/(R3-R4)≤-2.78；
    0.04≤d3/TTL≤0.06。
  6. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第三透镜的物侧面于近轴处为凹面，所述第三透镜的像侧面于近轴处为凸面；
    所述第三透镜的焦距为f3，所述第三透镜像侧面的中心曲率半径为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：
    0.54≤f3/f≤2.36；
    0.50≤(R5+R6)/(R5-R6)≤1.54；
    0.05≤d5/TTL≤0.15。
  7. 根据权利要求6所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列关系式：
    0.87≤f3/f≤1.89；
    0.80≤(R5+R6)/(R5-R6)≤1.23；
    0.07≤d5/TTL≤0.12。
  8. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第四透镜的像侧面于近轴处为凹面；
    所述第四透镜物侧面的中心曲率半径为R7，所述第四透镜像侧面的中心曲率半径为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：
    -8.78≤f4/f≤-1.03；
    -0.10≤(R7+R8)/(R7-R8)≤5.84；
    0.02≤d7/TTL≤0.07。
  9. 根据权利要求8所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列关系式：
    -5.49≤f4/f≤-1.29；
    -0.07≤(R7+R8)/(R7-R8)≤4.67；
    0.03≤d7/TTL≤0.06。
  10. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第五透镜的物侧面于近轴处为凹面，所述第五透镜的像侧面于近轴处为凸面；
    所述第五透镜物侧面的中心曲率半径为R9，所述第五透镜像侧面的中心曲率半径为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：
    0.35≤f5/f≤1.11；
    0.52≤(R9+R10)/(R9-R10)≤2.27；
    0.10≤d9/TTL≤0.39。
  11. 根据权利要求10所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列关系式：
    0.57≤f5/f≤0.89；
    0.84≤(R9+R10)/(R9-R10)≤1.82；
    0.17≤d9/TTL≤0.31。
  12. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第六透镜的物侧面于近轴处为凸面，所述第六透镜的像侧面于近轴处为凹面；
    所述第六透镜的焦距为f6，所述第六透镜物侧面的中心曲率半径为R11，所述第六透镜像侧面的中心曲率半径为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：
    -2.22≤f6/f≤-0.63；
    0.96≤(R11+R12)/(R11-R12)≤3.30；
    0.04≤d11/TTL≤0.17。
  13. 根据权利要求12所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列关系式：
    -1.39≤f6/f≤-0.78；
    1.53≤(R11+R12)/(R11-R12)≤2.64；
    0.07≤d11/TTL≤0.14。
  14. 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像高为IH，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：TTL/IH≤1.77。
  15. 根据权利要求14所述的摄像光学镜头，其特征在于，所述摄像光学镜头满足下列 关系式：TTL/IH≤1.72。
  16. 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视场角FOV大于或等于112.96°。
  17. 根据权利要求16所述的摄像光学镜头，其特征在于，所述摄像光学镜头的视场角FOV大于或等于114.11°。
  18. 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光圈值FNO小于或等于2.52。
  19. 根据权利要求18所述的摄像光学镜头，其特征在于，所述摄像光学镜头的光圈值FNO小于或等于2.47。
  20. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第一透镜与所述第二透镜的组合焦距为f12，且满足下列关系式：-28.14≤f12/f≤-2.93。
PCT/CN2020/139419 2020-12-14 2020-12-25 摄像光学镜头 WO2022126712A1 (zh)

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