WO2021127849A1 - 摄像光学镜头 - Google Patents

摄像光学镜头 Download PDF

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Publication number
WO2021127849A1
WO2021127849A1 PCT/CN2019/127463 CN2019127463W WO2021127849A1 WO 2021127849 A1 WO2021127849 A1 WO 2021127849A1 CN 2019127463 W CN2019127463 W CN 2019127463W WO 2021127849 A1 WO2021127849 A1 WO 2021127849A1
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Prior art keywords
lens
imaging optical
curvature
radius
image side
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PCT/CN2019/127463
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English (en)
French (fr)
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卞旭琪
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诚瑞光学(常州)股份有限公司
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Priority to PCT/CN2019/127463 priority Critical patent/WO2021127849A1/zh
Publication of WO2021127849A1 publication Critical patent/WO2021127849A1/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
    • 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 present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.
  • the photosensitive devices of general photographic lenses are nothing more than photosensitive coupled devices (CCD) or complementary metal oxide semiconductor devices (Complementary Metal).
  • CCD photosensitive coupled devices
  • CMOS Sensor complementary metal oxide semiconductor devices
  • the pixel size of photosensitive devices has been reduced, and the development trend of current electronic products with good functions, thin and short appearance, therefore, has a good
  • the miniaturized camera lens with image quality has become the mainstream in the current market.
  • the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element or four-element lens structure.
  • the purpose of the present invention is to provide an imaging optical lens that can meet the requirements of large aperture, ultra-thin and long focal length while obtaining high imaging performance.
  • the embodiments of the present invention provide an imaging optical lens.
  • the imaging optical lens includes in order from the object side to the image side: a first lens with positive refractive power, and a first lens with positive refractive power.
  • Two lenses a third lens with negative refractive power, a fourth lens with positive 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 total optical length of the imaging optical lens is TTL
  • the focal length of the first lens is f1
  • the on-axis distance from the image side of the sixth lens to the image plane is BF, which satisfies The following relationship:
  • the radius of curvature of the object side surface of the fourth lens is R7
  • the radius of curvature of the image side surface of the fourth lens is R8, which satisfies the following relationship:
  • the focal length of the sixth lens is f6, which satisfies the following relationship:
  • the focal length of the first lens is f1
  • the radius of curvature of the object side of the first lens is R1
  • the radius of curvature of the image side of the first lens is R2
  • the on-axis thickness of the first lens is d1
  • the focal length of the second lens is f2
  • the radius of curvature of the object side of the second lens is R3
  • the radius of curvature of the image side of the second lens is R4
  • the on-axis thickness of the first lens is d3
  • 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, and the on-axis thickness of the third lens is d5 , Satisfies the following relationship:
  • the focal length of the fourth lens is f4
  • the on-axis thickness of the fourth lens is d7, and the following relationship is satisfied:
  • 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 radius of curvature of the object side surface of the sixth lens is R11
  • the radius of curvature of the image side surface of the sixth lens is R12
  • the axial thickness of the sixth lens is d11, which satisfies the following relationship:
  • the aperture F number of the imaging optical lens is less than or equal to 3.50.
  • the imaging optical lens according to the present invention has excellent optical characteristics, and has the characteristics of large aperture, long focal length, and ultra-thinness, and is especially suitable for being composed of high-pixel CCD, CMOS and other imaging elements.
  • FIG. 1 is a schematic diagram of the structure of an imaging optical lens according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 1;
  • FIG. 3 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 1;
  • FIG. 4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 1;
  • FIG. 5 is a schematic diagram of the structure of an imaging optical lens according to a second embodiment of the present invention.
  • FIG. 6 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 5;
  • FIG. 7 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 5;
  • FIG. 8 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 5;
  • FIG. 9 is a schematic diagram of the structure of an imaging optical lens according to a third embodiment of the present invention.
  • FIG. 10 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 9;
  • FIG. 11 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 9;
  • FIG. 12 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 9.
  • FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
  • the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10 includes in order from the object side to the image side: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens. Lens L6.
  • An optical element 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 glass, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastic.
  • the focal length of the overall imaging optical lens 10 is defined as f, the focal length of the first lens L1 is f1, and the following relationship is satisfied: 0.70 ⁇ f1/f ⁇ 0.95, which specifies the ratio of the focal length f1 of the first lens L1 to the total focal length. It is conducive to ultra-thin system within the range of conditions.
  • the total optical length of the camera optical lens as TTL, and the on-axis distance from the image side of the sixth lens L6 to the image plane is BF, 0.35 ⁇ BF/TTL ⁇ 0.55.
  • TTL the total optical length of the camera optical lens
  • TTL the on-axis distance from the image side of the sixth lens L6 to the image plane
  • BF/TTL meets the conditions, it is beneficial to the system and electronic devices. assembly. Preferably, it satisfies 0.37 ⁇ BF/TTL ⁇ 0.55.
  • the radius of curvature of the object side surface of the fourth lens L4 as R7
  • the radius of curvature of the image side surface of the fourth lens L4 as R8, -10.00 ⁇ (R7+R8)/(R7-R8) ⁇ -1.50, specifying the fourth lens
  • the shape of L4 within the range specified by the conditional formula, can ease the deflection of light passing through the lens and effectively reduce aberrations.
  • it satisfies -9.98 ⁇ (R7+R8)/(R7-R8) ⁇ -1.52.
  • the focal length of the sixth lens L6 is defined as f6, -0.80 ⁇ f6/f ⁇ -0.50, which specifies the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the system, which helps to improve the performance of the optical system within the scope of the conditional expression. Preferably, it satisfies -0.79 ⁇ f6/f ⁇ -0.50.
  • the imaging optical lens 10 of the present invention When the focal length of the imaging optical lens 10 of the present invention, the focal length of each lens, the refractive index of the relevant lens, the total optical length of the imaging optical lens, the axial thickness and the radius of curvature satisfy the above-mentioned relational expressions, the imaging optical lens 10 can be made to have a high Performance, and meet the design requirements of low TTL.
  • the object side surface of the first lens L1 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.
  • the curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relationship: -8.26 ⁇ (R1+R2)/(R1-R2) ⁇ -2.59, which specifies the first lens
  • -8.26 ⁇ (R1+R2)/(R1-R2) ⁇ -2.59 which specifies the first lens
  • the shape of L1 is within the range specified by the conditional formula, as the lens develops toward an ultra-thin and longer focal length, it is beneficial to correct the problem of axial chromatic aberration.
  • the on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: 0.05 ⁇ d1/TTL ⁇ 0.20, which is conducive to achieving ultra-thinness.
  • the object side surface of the second lens L2 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.
  • the focal length of the second lens L2 is f2, which satisfies the following relationship: 0.42 ⁇ f2/f ⁇ 1.68.
  • the curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relationship: -7.47 ⁇ (R3+R4)/(R3-R4) ⁇ -1.10, which specifies the second lens
  • -7.47 ⁇ (R3+R4)/(R3-R4) ⁇ -1.10 which specifies the second lens
  • the shape of L2 is within the range, as the lens develops toward an ultra-thin and longer focal length, it is beneficial to correct the problem of axial chromatic aberration.
  • the on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.01 ⁇ d3/TTL ⁇ 0.10, which is beneficial to realize ultra-thinness.
  • the object side surface of the third lens L3 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has negative refractive power.
  • the focal length of the third lens L3 is f3, and satisfies the following relationship: -1.30 ⁇ f3/f ⁇ -0.36.
  • the system has better imaging quality and lower sensitivity.
  • the curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relationship: 0.62 ⁇ (R5+R6)/(R5-R6) ⁇ 2.47, which defines the shape of the third lens .
  • the degree of deflection of light passing through the lens can be eased, and aberrations can be effectively reduced.
  • the on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.01 ⁇ d5/TTL ⁇ 0.06, which is beneficial to realize ultra-thinness.
  • the object side surface of the fourth lens L4 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.
  • the focal length f4 of the fourth lens L4 satisfies the following relational expression: 0.88 ⁇ f4/f ⁇ 9.13.
  • the reasonable distribution of optical power enables the system to have better imaging quality and lower sensitivity.
  • the on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.02 ⁇ d7/TTL ⁇ 0.14, which is beneficial to realize ultra-thinness.
  • 0.02 ⁇ d7/TTL 0.02 ⁇ d7/TTL ⁇ 0.11.
  • the object side surface of the fifth lens L5 is concave at the paraxial position, and the image side surface is convex at the paraxial position, and has positive refractive power.
  • the focal length f5 of the fifth lens L5 satisfies the following relationship: 0.41 ⁇ f5/f ⁇ 1.58.
  • the limitation of the fifth lens L5 can effectively make the light angle of the imaging lens smooth and reduce the tolerance sensitivity.
  • the curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relationship: 1.23 ⁇ (R9+R10)/(R9-R10) ⁇ 4.13, and the fifth lens L5 is specified
  • the shape is within the range of conditions, with the development of ultra-thin and long focal length, it is helpful to correct the aberration of the off-axis angle of view.
  • the on-axis thickness of the fifth lens L5 is d9, which satisfies the following relationship: 0.02 ⁇ d9/TTL ⁇ 0.14, which is beneficial to realize ultra-thinness.
  • 0.03 ⁇ d9/TTL 0.03 ⁇ d9/TTL ⁇ 0.11.
  • the object side surface of the sixth lens L6 is concave at the paraxial position, and the image side surface is concave at the paraxial position, and has a negative refractive power.
  • the curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relationship: -1.11 ⁇ (R11+R12)/(R11-R12) ⁇ 0.34, the sixth lens is specified
  • the shape of L6 is within the range of conditions, with the development of ultra-thin and long focal length, it is helpful to correct the aberration of the off-axis angle of view.
  • the on-axis thickness of the sixth lens L6 is d11, which satisfies the following relationship: 0.01 ⁇ d11/TTL ⁇ 0.08, which is beneficial to realize ultra-thinness.
  • the aperture F number of the imaging optical lens 10 is less than or equal to 3.50. Large aperture, good imaging performance. Preferably, the aperture F number of the imaging optical lens 10 is less than or equal to 3.43.
  • the overall optical length TTL of the overall imaging optical lens 10 can be shortened as much as possible, and the characteristics of miniaturization can be maintained.
  • the imaging optical lens 10 of the present invention will be described below with an example.
  • the symbols described in each example are as follows.
  • the unit of focal length, distance on axis, radius of curvature, thickness on axis, position of inflection point, and position of stagnation point is mm.
  • TTL The total optical length of the camera optical lens, in mm;
  • the object side and/or the image side of the lens can also be provided with inflection points and/or stagnation points to meet high-quality imaging requirements.
  • inflection points and/or stagnation points for specific implementations, refer to the following.
  • Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
  • R The radius of curvature of the optical surface, and the radius of curvature of the center of the lens
  • R1 the radius of curvature of the object side surface of the first lens L1;
  • R2 the radius of curvature of the image side surface of the first lens L1;
  • R3 the radius of curvature of the object side surface of the second lens L2;
  • R4 the radius of curvature of the image side surface of the second lens L2;
  • R5 the radius of curvature of the object side surface of the third lens L3;
  • R6 the radius of curvature of the image side surface of the third lens L3;
  • R7 the radius of curvature of the object side of the fourth lens L4;
  • R8 the radius of curvature of the image side surface of the fourth lens L4;
  • R9 the radius of curvature of the object side surface of the fifth lens L5;
  • R10 the radius of curvature of the image side surface of the fifth lens L5;
  • R11 the radius of curvature of the object side surface of the sixth lens L6;
  • R12 the radius of curvature of the image side surface of the sixth lens L6;
  • R13 the radius of curvature of the object side surface of the optical filter GF
  • R14 the radius of curvature of the image side surface of the optical filter GF
  • d0 the on-axis distance from the aperture S1 to the object side of the first lens L1;
  • d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;
  • d4 the on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;
  • d6 the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;
  • d10 the on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;
  • d11 the on-axis thickness of the sixth lens L6;
  • d12 the on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the optical filter GF;
  • d14 the on-axis distance from the image side surface of the optical filter GF to the image surface
  • nd refractive index of d-line
  • nd1 the refractive index of the d-line of the first lens L1;
  • nd2 the refractive index of the d-line of the second lens L2;
  • nd3 the refractive index of the d-line of the third lens L3;
  • nd4 the refractive index of the d-line of the fourth lens L4;
  • nd5 the refractive index of the d-line of the fifth lens L5;
  • nd6 the refractive index of the d-line of the sixth lens L6;
  • ndg the refractive index of the d-line of the optical filter GF
  • vg Abbe number of optical filter GF.
  • Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.
  • the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (1).
  • the present invention is not limited to the aspheric polynomial form represented by the formula (1).
  • Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
  • P1R1 and P1R2 represent the object side and image side of the first lens L1 respectively
  • P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively
  • P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively.
  • P4R1, P4R2 represent the object side and image side of the fourth lens L4
  • P5R1, P5R2 represent the object side and the image side of the fifth lens L5
  • P6R1, P6R2 represent the object side and the image side of the sixth lens L6, respectively.
  • the corresponding data in the “reflection point position” column is the vertical distance from the reflex point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • the data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 10 of the first embodiment.
  • the field curvature S in FIG. 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction. song.
  • Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.
  • the first embodiment satisfies various conditional expressions.
  • the imaging optical lens has an entrance pupil diameter of 4.247mm, a full field of view image height of 2.502mm, a diagonal field of view angle of 19.53°, a long focal length, ultra-thin, and its axis,
  • the off-axis chromatic aberration is fully corrected and has excellent optical characteristics.
  • the second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
  • Table 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 6 shows the aspheric surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 7 and Table 8 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • FIG. 6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 470 nm, 510 nm, 555 nm, 610 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 second embodiment satisfies various conditional expressions.
  • the entrance pupil diameter of the imaging optical lens is 4.182mm
  • the full field of view image height is 2.502mm
  • the diagonal field of view is 19.96°
  • long focal length ultra-thin
  • ultra-thin and its axis
  • the off-axis chromatic aberration is fully corrected and has excellent optical characteristics.
  • the third embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
  • Table 9 and Table 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 10 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 11 and Table 12 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 30 of the third embodiment of the present invention.
  • FIG. 10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm pass through the imaging optical lens 30 of the third embodiment.
  • FIG. 12 shows a schematic diagram of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 30 of the third embodiment.
  • the imaging optical lens has an entrance pupil diameter of 4.818mm, a full field of view image height of 2.502mm, a diagonal field of view angle of 17.11°, a long focal length, ultra-thin, and its axis,
  • the off-axis chromatic aberration is fully corrected and has excellent optical characteristics.

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Abstract

一种摄像光学镜头，自物侧至像侧依序包括：具有正屈折力的第一透镜（L1），具有正屈折力的第二透镜（L2），具有负屈折力的第三透镜（L3），具有正屈折力的第四透镜（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），且满足下列关系式：0.70≤f1/f≤0.95，0.35≤BF/TTL≤0.55。

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，随着智能手机的兴起，小型化摄影镜头的需求日渐提高，而一般摄影镜头的感光器件不外乎是感光耦合器件(Charge Coupled Device，CCD)或互补性氧化金属半导体器件(Complementary Metal-OxideSemiconductor Sensor，CMOS Sensor)两种，且由于半导体制造工艺技术的精进，使得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短小的外型为发展趋势，因此，具备良好成像品质的小型化摄像镜头俨然成为目前市场上的主流。为获得较佳的成像品质，传统搭载于手机相机的镜头多采用三片式或四片式透镜结构。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，五片式、六片式、七片式透镜结构逐渐出现在镜头设计当中。迫切需求具有优秀的光学特征、超薄且色像差充分补正的长焦距摄像镜头。
技术问题
针对上述问题，本发明的目的在于提供一种摄像光学镜头，能在获得高成像性能的同时，满足大光圈、超薄化和长焦距化的要求。
技术解决方案
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，自物侧至像侧依序包含：具有正屈折力的第一透镜，具有正屈折力的第二透镜，具有负屈折力的第三透镜，具有正屈折力的第四透镜，具有正屈折力的第五透镜，以及具有负屈折力的第六透镜；
所述摄像光学镜头的焦距为f，所述摄像光学镜头的光学总长为TTL，所述第一透镜的焦距为f1，所述第六透镜的像侧面到像面的轴上距离为BF，满足下列关系式：
0.70≤f1/f≤0.95；
0.35≤BF/TTL≤0.55。
优选的，所述第四透镜的物侧面的曲率半径为R7，所述第四透镜的像侧面的曲率半径为R8，满足下列关系式：
-10.00≤(R7+R8)/(R7-R8)≤-1.50。
优选的，所述第六透镜的焦距为f6，满足下列关系式：
-0.80≤f6/f≤-0.50
优选的，所述第一透镜的焦距为f1，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，所述第一透镜的轴 上厚度为d1，且满足下列关系式：
0.35≤f1/f≤1.42；
-8.26≤(R1+R2)/(R1-R2)≤-2.59；
0.05≤d1/TTL≤0.20。
优选的，所述第二透镜的焦距为f2，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，所述第一透镜的轴上厚度为d3，且满足下列关系式：
0.42≤f2/f≤1.68；
-7.47≤(R3+R4)/(R3-R4)≤-1.10；
0.01≤d3/TTL≤0.10。
优选的，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，满足下列关系式：
-1.30≤f3/f≤-0.36；
0.62≤(R5+R6)/(R5-R6)≤2.47；
0.01≤d5/TTL≤0.06。
优选的，所述第四透镜的焦距为f4，所述第四透镜的轴上厚度为d7，且满足下列关系式：
0.88≤f4/f≤9.13；
0.02≤d7/TTL≤0.14。
优选的，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，且满足下列关系式：
0.41≤f5/f≤1.58；
1.23≤(R9+R10)/(R9-R10)≤4.13；
0.02≤d9/TTL≤0.14。
优选的，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，满足下列关系式：
-1.11≤(R11+R12)/(R11-R12)≤0.34；
0.01≤d11/TTL≤0.08。
优选的，所述摄像光学镜头的光圈F数小于或等于3.50。
有益效果
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、长焦距化、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
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。
本发明的实施方式
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包括六个透镜。具体的，所述摄像光学镜头10，由物侧至像侧依序包括：光圈S1、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以及第六透镜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。
所述第一透镜L1为玻璃材质，所述第二透镜L2、所述第三透镜L3、所述第四透镜L4、所述第五透镜L5以及所述第六透镜L6均为塑料材质。
定义整体摄像光学镜头10的焦距为f，第一透镜L1的焦距为f1，满足下列关系式：0.70≤f1/f≤0.95，规定了第一透镜L1的焦距f1与总焦距的比值。在条件范围内有利于系统超薄化。
定义摄像光学镜头的光学总长为TTL，第六透镜L6的像侧面到像面的轴上距离为BF，0.35≤BF/TTL≤0.55，当BF/TTL满足条件时，有利于系统与电子器件的装配。优选的，满足0.37≤BF/TTL≤0.55。
定义第四透镜L4的物侧面的曲率半径为R7，第四透镜L4的像侧面的曲率半径为R8，-10.00≤(R7+R8)/(R7-R8)≤-1.50，规定了第四透镜L4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。优选的，满足-9.98≤(R7+R8)/(R7-R8)≤-1.52。
定义第六透镜L6的焦距为f6，-0.80≤f6/f≤-0.50，规定了第六透镜L6焦距f6与系统焦距f的比值，在条件式范围内有助于提高光学系统性能。优选的，满足-0.79≤f6/f≤-0.50。
当本发明所述摄像光学镜头10的焦距、各透镜的焦距、相关透镜的折射率、摄像光学镜头的光学总长、轴上厚度和曲率半径满足上述关系式时，可以使摄像光学镜头10具有高性能，且满足低TTL的设计需求。
本实施方式中，第一透镜L1的物侧面于近轴处为凸面，像侧面于近轴处为凹面，具有正屈折力。
第一透镜L1物侧面的曲率半径R1，第一透镜L1像侧面的曲率半径R2，满足下列关系式：-8.26≤(R1+R2)/(R1-R2)≤-2.59，规定了第一透镜L1的形状，在条件式规定范围内时，随着镜头向超薄长焦距化发展，有利于补正轴上色像差问题。优选的，-5.16≤R1+R2)/(R1-R2)≤-3.24。
第一透镜L1的轴上厚度为d1，满足下列关系式：0.05≤d1/TTL≤0.20，有利于实现超薄化。优选的，0.08≤d1/TTL≤0.16。
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，具有正屈折力。
第二透镜L2的焦距为f2，满足下列关系式：0.42≤f2/f≤1.68，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。优选的，满足0.67≤f2/f≤1.34。
第二透镜L2物侧面的曲率半径R3，第二透镜L2像侧面的曲率半径R4，满足下列关系式：-7.47≤(R3+R4)/(R3-R4)≤-1.10，规定了第二透镜L2的形状，在范围内时，随着镜头向超薄长焦距化发展，有利于补正轴上色像差问题。优选的，-4.67≤(R3+R4)/(R3-R4)≤-1.37。
第二透镜L2的轴上厚度为d3，满足下列关系式：0.01≤d3/TTL≤0.10，有利于实现超薄化。优选的，0.02≤d3/TTL≤0.08。
本实施方式中，第三透镜L3的物侧面于近轴处为凸面，像侧面于近轴处为凹面，具有负屈折力。
第三透镜L3焦距f3，以及满足下列关系式：-1.30≤f3/f≤-0.36， 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。优选的，-0.81≤f3/f≤-0.45。
第三透镜L3物侧面的曲率半径R5，第三透镜L3像侧面的曲率半径R6，满足下列关系式：0.62≤(R5+R6)/(R5-R6)≤2.47，规定了第三透镜的形状，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。优选的，0.99≤(R5+R6)/(R5-R6)≤1.98。
第三透镜L3的轴上厚度为d5，满足下列关系式：0.01≤d5/TTL≤0.06，有利于实现超薄化。优选的，0.02≤d5/TTL≤0.05。
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，具有正屈折力。
第四透镜L4焦距f4，满足下列关系式：0.88≤f4/f≤9.13，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。优选的，1.40≤f4/f≤7.31。
第四透镜L4的轴上厚度为d7，满足下列关系式：0.02≤d7/TTL≤0.14，有利于实现超薄化。优选的，0.02≤d7/TTL≤0.11。
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，具有正屈折力。
第五透镜L5焦距f5，满足下列关系式：0.41≤f5/f≤1.58，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。优选的，0.65≤f5/f≤1.27。
第五透镜L5物侧面的曲率半径R9，第五透镜L5像侧面的曲率半径R10，满足下列关系式：1.23≤(R9+R10)/(R9-R10)≤4.13，规定的是第五透镜L5的形状，在条件范围内时，随着超薄长焦距化发展，有利于补正轴外画角的像差等问题。优选的，1.97≤(R9+R10)/(R9-R10)≤3.31。
第五透镜L5的轴上厚度为d9，满足下列关系式：0.02≤d9/TTL≤0.14，有利于实现超薄化。优选的，0.03≤d9/TTL≤0.11。
本实施方式中，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，具有负屈折力。
第六透镜L6物侧面的曲率半径R11，第六透镜L6像侧面的曲率半径R12，满足下列关系式：-1.11≤(R11+R12)/(R11-R12)≤0.34，规定的是第六透镜L6的形状，在条件范围内时，随着超薄长焦距化发展，有利于补正轴外画角的像差等问题。优选的，-0.69≤(R11+R12)/(R11-R12)≤0.27。
第六透镜L6的轴上厚度为d11，满足下列关系式：0.01≤d11/TTL≤0.08，有利于实现超薄化。优选的，0.02≤d11/TTL≤0.07。
本实施方式中，摄像光学镜头10的光圈F数小于或等于3.50。大 光圈，成像性能好。优选的，摄像光学镜头10的光圈F数小于或等于3.43。
如此设计，能够使得整体摄像光学镜头10的光学总长TTL尽量变短，维持小型化的特性。
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、反曲点位置、驻点位置的单位为mm。
TTL：摄像光学镜头的光学总长，单位为mm；
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 PCTCN2019127463-appb-000001
其中，各符号的含义如下。
S1：光圈；
R：光学面的曲率半径、透镜时为中心曲率半径；
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：光学过滤片GF的物侧面的曲率半径；
R14：光学过滤片GF的像侧面的曲率半径；
d：透镜的轴上厚度与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；
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 PCTCN2019127463-appb-000002
其中，k是圆锥系数，A4、A6、A8、A10、A12、A14、A16是非球面系数。
IH：像高
y＝(x 2/R)/[1+{1-(k+1)(x 2/R 2)} 1/2]+A4x 4+A6x 6+A8x 8+A10x 10+A12x 12+A14x 14+A16x 16       (1)
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、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        
P1R2        
P2R1        
P2R2        
P3R1        
P3R2 1 1.395    
P4R1        
P4R2 3 0.665 1.045 1.315
P5R1        
P5R2 1 1.445    
P6R1        
P6R2 1 0.325    
【表4】
Figure PCTCN2019127463-appb-000003
Figure PCTCN2019127463-appb-000004
图2、图3分别示出了波长为470nm、510nm、555nm、610nm、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示出各实例1、2、3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，所述摄像光学镜头的入瞳直径为4.247mm，全视场像高为2.502mm，对角线方向的视场角为19.53°，长焦距、超薄，其轴上、轴外色像差充分补正，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。
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 PCTCN2019127463-appb-000005
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 PCTCN2019127463-appb-000006
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        
P1R2        
P2R1        
P2R2        
P3R1 1 1.415    
P3R2 1 1.365    
P4R1 1 1.415    
P4R2 3 0.335 1.115 1.245
P5R1        
P5R2 1 1.505    
P6R1 1 1.475    
P6R2 1 0.495    
【表8】
Figure PCTCN2019127463-appb-000007
Figure PCTCN2019127463-appb-000008
图6、图7分别示出了波长为470nm、510nm、555nm、610nm、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。
如表13所示，第二实施方式满足各条件式。
在本实施方式中，所述摄像光学镜头的入瞳直径为4.182mm，全视场像高为2.502mm，对角线方向的视场角为19.96°，长焦距、超薄，其轴上、轴外色像差充分补正，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。
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 PCTCN2019127463-appb-000009
Figure PCTCN2019127463-appb-000010
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 PCTCN2019127463-appb-000011
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】
Figure PCTCN2019127463-appb-000012
Figure PCTCN2019127463-appb-000013
【表12】
  驻点个数 驻点位置1
P1R1    
P1R2    
P2R1    
P2R2    
P3R1    
P3R2    
P4R1    
P4R2 1 1.415
P5R1    
P5R2    
P6R1    
P6R2    
图10、图11分别示出了波长为470nm、510nm、555nm、610nm、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。
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，所述摄像光学镜头的入瞳直径为4.818mm，全视场像高为2.502mm，对角线方向的视场角为17.11°，长焦距、超薄，其轴上、轴外色像差充分补正，且具有优秀的光学特征。
【表13】
Figure PCTCN2019127463-appb-000014
Figure PCTCN2019127463-appb-000015
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，自物侧至像侧依序包含：具有正屈折力的第一透镜，具有正屈折力的第二透镜，具有负屈折力的第三透镜，具有正屈折力的第四透镜，具有正屈折力的第五透镜，以及具有负屈折力的第六透镜；
    所述摄像光学镜头的焦距为f，所述摄像光学镜头的光学总长为TTL，所述第一透镜的焦距为f1，所述第六透镜的像侧面到像面的轴上距离为BF，满足下列关系式：
    0.70≤f1/f≤0.95；
    0.35≤BF/TTL≤0.55。
  2. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第四透镜的物侧面的曲率半径为R7，所述第四透镜的像侧面的曲率半径为R8，满足下列关系式：
    -10.00≤(R7+R8)/(R7-R8)≤-1.50。
  3. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第六透镜的焦距为f6，满足下列关系式：
    -0.80≤f6/f≤-0.50。
  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，所述第一透镜的轴上厚度为d1，且满足下列关系式：
    -8.26≤(R1+R2)/(R1-R2)≤-2.59；
    0.05≤d1/TTL≤0.20。
  5. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第二透镜的焦距为f2，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，所述第一透镜的轴上厚度为d3，且满足下列关系式：
    0.42≤f2/f≤1.68；
    -7.47≤(R3+R4)/(R3-R4)≤-1.10；
    0.01≤d3/TTL≤0.10。
  6. 根据权利要求5所述的摄像光学镜头，其特征在于，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，满足下列关系式：
    -1.30≤f3/f≤-0.36；
    0.62≤(R5+R6)/(R5-R6)≤2.47；
    0.01≤d5/TTL≤0.06。
  7. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第四透镜的焦距为f4，所述第四透镜的轴上厚度为d7，且满足下列关系式：
    0.88≤f4/f≤9.13；
    0.02≤d7/TTL≤0.14。
  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，且满足下列关系式：
    0.41≤f5/f≤1.58；
    1.23≤(R9+R10)/(R9-R10)≤4.13；
    0.02≤d9/TTL≤0.14。
  9. 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，满足下列关系式：
    -1.11≤(R11+R12)/(R11-R12)≤0.34；
    0.01≤d11/TTL≤0.08。
  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光圈F数小于或等于3.50。
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CN108241200A (zh) * 2016-12-26 2018-07-03 三星电机株式会社 光学成像系统
CN108681041A (zh) * 2018-04-26 2018-10-19 瑞声科技(新加坡)有限公司 摄像光学镜头
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CN109856772A (zh) * 2018-12-27 2019-06-07 瑞声科技(新加坡)有限公司 摄像光学镜头
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US20140043662A1 (en) * 2012-08-08 2014-02-13 Hirotoshi NAKAYAMA Scanner lens, image reader and image forming device
CN110187472A (zh) * 2014-11-18 2019-08-30 三星电机株式会社 镜头模块
CN109073861A (zh) * 2016-04-15 2018-12-21 苹果公司 成像透镜系统
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