WO2021237781A1 - 摄像光学镜头 - Google Patents

摄像光学镜头 Download PDF

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Publication number
WO2021237781A1
WO2021237781A1 PCT/CN2020/094524 CN2020094524W WO2021237781A1 WO 2021237781 A1 WO2021237781 A1 WO 2021237781A1 CN 2020094524 W CN2020094524 W CN 2020094524W WO 2021237781 A1 WO2021237781 A1 WO 2021237781A1
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Prior art keywords
lens
imaging optical
curvature
optical lens
radius
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English (en)
French (fr)
Inventor
彭海潮
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AAC Optics Changzhou Co Ltd
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AAC Optics Changzhou Co Ltd
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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 -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G02B9/36—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only arranged + -- +
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • 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
    • G02B13/004—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 four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration

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.
  • the development trend of current electronic products with good functions, light, thin and short appearance therefore, has The miniaturized camera lens with good image quality has become the mainstream in the current market.
  • the lenses traditionally mounted on mobile phone cameras often adopt a three-element lens structure.
  • the pixel area of the photosensitive device continues to shrink, and the system's requirements for image quality continue to increase, the four-element lens structure gradually appears in the lens design, and it is common Although the four-element lens has good optical performance, its focal length distribution, lens pitch, lens shape and dispersion coefficient settings are still unreasonable, resulting in the lens structure not being able to meet the requirements of good optical performance and long Focal length and ultra-thin design requirements.
  • the object of the present invention is to provide an imaging optical lens, which has good optical performance while meeting the design requirements of long focal length and ultra-thinness.
  • the embodiments of the present invention provide an imaging optical lens.
  • the imaging optical lens includes, from the object side to the image side, in sequence: a first lens with a positive refractive power and a second lens with a negative refractive power. Two lenses, a third lens with negative refractive power and a fourth lens with positive refractive power;
  • the Abbe number of the first lens is v1
  • the Abbe number of the fourth lens is v4
  • the overall focal length of the imaging optical lens is f
  • the focal length of the second lens is f2
  • the focal length of the third lens Is f3
  • 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, and the axis from the image side of the second lens to the object side of the third lens
  • the upper distance is d4
  • the on-axis thickness of the third lens is d5, and the following relationship is satisfied:
  • the curvature radius of the object side surface of the second lens is R3, the on-axis thickness of the second lens is d3, and the following relationship is satisfied:
  • the radius of curvature of the object side surface of the first lens is R1
  • the radius of curvature of the image side surface of the first lens is R2, and the following relationship is satisfied:
  • 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 Is d1
  • the overall optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the radius of curvature of the object side surface of the second lens is R3
  • the radius of curvature of the image side surface of the second lens is R4
  • the axial thickness of the second lens is d3
  • the entire imaging optical lens is TTL and satisfies the following relationship:
  • the curvature radius of the object side surface of the third lens is R5
  • the curvature radius of the image side surface of the third lens is R6
  • the overall optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the focal length of the fourth lens is f4
  • the axial thickness of the fourth lens is d7
  • the total optical length of the imaging optical lens is TTL
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship:
  • the combined focal length of the first lens and the second lens is f12, and satisfies the following relationship:
  • the first lens is made of glass.
  • the imaging optical lens according to the present invention has good optical performance, and has the characteristics of long focal length and ultra-thinness, and is especially suitable for mobile phone camera lens assemblies composed of high-pixel CCD, CMOS and other imaging elements.
  • WEB camera lens is especially suitable for mobile phone camera lens assemblies 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. 13 is a schematic diagram of the structure of an imaging optical lens according to a fourth embodiment of the present invention.
  • FIG. 14 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 13;
  • FIG. 15 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 13;
  • FIG. 16 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 13.
  • FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
  • the imaging optical lens 10 includes four lenses.
  • the imaging optical lens 10 includes an aperture S1, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence from the object side to the image side.
  • an optical element such as a glass plate GF is arranged between the fourth lens L4 and the image plane Si.
  • the glass plate GF can be a glass cover plate or an optical filter, of course. In other embodiments, the glass plate GF can also be arranged in other positions.
  • the first lens L1 has positive refractive power
  • the second lens L2 has negative refractive power
  • the third lens L3 has negative refractive power
  • the fourth lens L4 has positive refractive power
  • 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 Abbe number v1 of the first lens L1, the Abbe number v4 of the fourth lens L4, the overall focal length of the imaging optical lens 10 is f
  • the focal length of the second lens L2 is f2
  • the focal length of the third lens L3 is f3
  • the radius of curvature of the object side of the fourth lens L4 is R7
  • the radius of curvature of the image side of the fourth lens L4 is R8,
  • the on-axis distance from the image side of the second lens L2 to the object side of the third lens L3 is d4
  • the on-axis thickness of the third lens L3 is d5, which satisfies the following relationship:
  • the relational formula (1) specifies the ratio of the dispersion coefficient of the first lens L1 and the fourth lens L4, and the aberration can be effectively reduced within the range of the relational formula.
  • the relational formula (2) specifies the ratio of the focal length f2 of the second lens L2 to the total focal length f of the system, which can effectively balance the spherical aberration and field curvature of the system.
  • the relational formula (3) specifies the ratio of the focal length f3 of the third lens L3 to the total focal length f of the system, and the reasonable distribution of the optical power enables the system to have better imaging quality and lower sensitivity.
  • the relational formula (4) specifies the shape of the fourth lens L4. When it is within the range of the relational formula, with the development of ultra-thinning, it is beneficial to correct the aberration of the off-axis angle of view.
  • the relational formula (5) specifies the ratio of the on-axis distance d4 between the image side surface of the second lens L2 and the object side surface of the third lens L3 to the on-axis thickness d5 of the third lens L3. Within the range of the relational expression, it helps to compress The total length of the optical system achieves an ultra-thin effect.
  • This relational expression specifies the ratio of the curvature radius R3 of the object side surface of the second lens L2 to the on-axis thickness d3 of the second lens L2. Within the range of the relational expression, it helps to improve the performance of the optical system.
  • the radius of curvature of the object side surface of the first lens L1 is R1
  • the radius of curvature of the image side surface of the first lens L1 is R2, and the following relationship is satisfied: -1.00 ⁇ R1/R2 ⁇ 0.
  • This relational expression specifies the shape of the first lens L1. Within the range of the relational expression, the degree of deflection of light passing through the lens can be relaxed, and aberrations can be effectively reduced.
  • the object side surface of the first lens L1 is convex at the paraxial position, and the image side surface is convex at the paraxial position.
  • the overall focal length of the imaging optical lens 10 is f
  • the focal length of the first lens L1 is defined as f1
  • the following relationship is satisfied: 0.19 ⁇ f1/f ⁇ 0.71.
  • This relational expression specifies the ratio of the focal length of the first lens L1 to the total focal length f of the system.
  • the first lens L1 has an appropriate positive refractive power, which is beneficial to reduce system aberrations, and at the same time is beneficial to the lens to super Thinning development.
  • 0.30 ⁇ f1/f ⁇ 0.57 is satisfied.
  • the curvature radius of the object side surface of the first lens L1 is R1, and the curvature radius of the image side surface of the first lens L1 is R2, and the following relationship is satisfied: -1.98 ⁇ (R1+R2)/(R1-R2) ⁇ 0.
  • -1.24 ⁇ (R1+R2)/(R1-R2) ⁇ 0 is satisfied.
  • the on-axis thickness of the first lens L1 as d1
  • TTL total optical length of the imaging optical lens 10
  • 0.08 ⁇ d1/TTL ⁇ 0.25 Within the range of the relational formula, it is conducive to achieving ultra-thinness.
  • 0.12 ⁇ d1/TTL ⁇ 0.20 is satisfied.
  • the object side surface of the second lens L2 is concave at the paraxial position, and the image side surface is concave at the paraxial position.
  • the total optical length of the imaging optical lens 10 is TTL, and the on-axis thickness of the second lens L2 is defined as d3, which satisfies the following relationship: 0.02 ⁇ d3/TTL ⁇ 0.10. Within the range of the relational formula, it is conducive to achieving ultra-thinness. Preferably, 0.03 ⁇ d3/TTL ⁇ 0.08 is satisfied.
  • the object side surface of the third lens L3 is concave at the paraxial position, and the image side surface is convex at the paraxial position.
  • R5 the radius of curvature of the object side surface of the third lens L3 as R5
  • R6 the radius of curvature of the image side surface of the third lens L3 as R6, satisfying the following relationship: -6.22 ⁇ (R5+R6)/(R5-R6) ⁇ 0.41.
  • This relational expression specifies the shape of the third lens L3, which facilitates the molding of the third lens L3.
  • the degree of deflection of light passing through the lens can be relaxed, and aberrations can be effectively reduced.
  • it satisfies -3.89 ⁇ (R5+R6)/(R5-R6) ⁇ 0.33.
  • 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 relationship: 0.01 ⁇ d5/TTL ⁇ 0.07. Within the range of the relationship, it is beneficial to achieve ultra-thinness. Preferably, 0.02 ⁇ d5/TTL ⁇ 0.06 is satisfied.
  • 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.
  • the overall focal length of the imaging optical lens 10 is f
  • the focal length of the fourth lens L4 is defined as f4, which satisfies the following relationship: 0.24 ⁇ f4/f ⁇ 2.73.
  • the system has better imaging quality and Lower sensitivity.
  • 0.39 ⁇ f4/f ⁇ 2.18 is satisfied.
  • the total optical length of the imaging optical lens 10 is TTL, and the on-axis thickness of the fourth lens L4 is defined as d7, which satisfies the following relationship: 0.02 ⁇ d7/TTL ⁇ 0.11. Within the range of the relational formula, it is conducive to achieving ultra-thinness. Preferably, 0.03 ⁇ d7/TTL ⁇ 0.09.
  • the overall focal length of the imaging optical lens 10 is f, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: f/TTL ⁇ 1.06, thereby achieving ultra-thinness.
  • the overall 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, and the following relationship is satisfied: 0.33 ⁇ f12/f ⁇ 1.18.
  • 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 to maintain the miniaturization of the imaging lens system group.
  • 0.52 ⁇ f12/f ⁇ 0.94 is satisfied.
  • the imaging optical lens 10 can meet the design requirements of long focal length and ultra-thin while having good optical performance.
  • the optical lens 10 is especially suitable for high-pixel Mobile phone camera lens assembly and WEB camera lens composed of CCD, CMOS and other imaging elements.
  • the imaging optical lens 10 of the present invention will be described below with examples.
  • the symbols described in each example are as follows.
  • the unit of focal length, on-axis distance, radius of curvature, 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), the unit is mm.
  • Aperture value FNO refers to the ratio of the effective focal length of the imaging optical lens to the entrance pupil diameter.
  • 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, see below.
  • Table 1 shows 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 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 surface 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 glass plate GF
  • R10 the radius of curvature of the image side surface of the glass plate 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;
  • nd refractive index of d-line (d-line is green light with a wavelength of 550nm);
  • 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;
  • ndg the refractive index of the d-line of the glass plate GF
  • vg Abbe number of glass plate GF.
  • Table 2 shows the aspheric surface data of each lens of the imaging optical lens 10 provided in the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.
  • x is the vertical distance between a point on the aspheric curve and the optical axis
  • y is the depth of the aspheric surface (the point on the aspheric surface from the optical axis is x, and the vertical distance between the tangent plane tangent to the vertex on the aspheric optical axis ).
  • each lens in this embodiment preferably uses the aspheric surface shown in the following relational expression (6), but the specific form of the following relational expression (6) is only an example. In fact, It is not limited to the aspheric polynomial form shown in relation (6).
  • Table 3 shows the design data of the inflection point of each lens in the imaging optical lens 10 of the 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 and P4R2 respectively represent the object side surface and the image side surface of the fourth lens L4.
  • 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.
  • FIG. 2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm pass through the imaging optical lens 10 of the first embodiment.
  • 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 16 shows the corresponding values of various values in each of Examples 1, 2, 3, and 4 and the parameters that have been specified in the relational expressions.
  • the first embodiment satisfies various relational expressions.
  • the entrance pupil diameter ENPD of the imaging optical lens 10 is 3.442 mm
  • the full-field image height IH is 2.040 mm
  • the diagonal field angle FOV is 19.60°
  • the imaging optical lens 10 It meets the design requirements of long focal length and ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • FIG. 5 is a schematic diagram of the structure of the imaging optical lens 20 in the second embodiment.
  • 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.
  • the first lens L1 is made of glass
  • the second lens L2 is made of plastic
  • the third lens L3 is made of plastic
  • the fourth lens L4 is made of plastic.
  • Table 4 shows design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 5 shows the aspheric surface data of each lens of the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 6 and Table 7 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 of the embodiment of the present invention.
  • 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 20.
  • FIG. 6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm pass through the imaging optical lens 20 of the second embodiment.
  • FIG. 8 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing 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 meridian direction. song.
  • Table 16 shows the corresponding values of various values in each of Examples 1, 2, 3, and 4 and the parameters that have been specified in the relational expressions.
  • the second embodiment satisfies various relational expressions.
  • the entrance pupil diameter ENPD of the imaging optical lens 20 is 3.441 mm
  • the full-field image height IH is 2.040 mm
  • the diagonal field angle FOV is 19.59°
  • the imaging optical lens 20 To meet the design requirements of long focal length and ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics and excellent optical characteristics.
  • FIG. 9 is a schematic diagram of the structure of an imaging optical lens 30 in the third embodiment.
  • the third embodiment is basically the same as the first embodiment.
  • Table 8 shows the design data of the imaging optical lens 30 of the third embodiment of the present invention.
  • Table 9 shows the aspheric surface data of each lens of the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 10 and Table 11 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 30 of the embodiment of the present invention.
  • 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 30.
  • FIG. 10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm pass through the imaging optical lens 30 of the third embodiment.
  • FIG. 12 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing 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 meridian direction. song.
  • Table 16 shows the corresponding values of various values in each of Examples 1, 2, 3, and 4 and the parameters that have been specified in the relational expressions.
  • the third embodiment satisfies various relational expressions.
  • the entrance pupil diameter ENPD of the imaging optical lens 30 is 3.441 mm
  • the full-field image height IH is 2.040 mm
  • the diagonal field angle FOV is 19.77°
  • the imaging optical lens 30 It meets the design requirements of long focal length and ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • FIG. 13 is a schematic diagram of the structure of the imaging optical lens 40 in the fourth embodiment.
  • the fourth 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.
  • the image side surface of the second lens L2 is convex at the paraxial position
  • the image side surface of the third lens L3 is concave at the paraxial position
  • the first lens L1 is made of glass
  • the second lens L2 is made of plastic
  • the third lens L3 is made of plastic
  • the fourth lens L4 is made of plastic.
  • Table 12 shows design data of the imaging optical lens 40 of the fourth embodiment of the present invention.
  • Table 13 shows the aspheric surface data of each lens of the imaging optical lens 40 according to the fourth embodiment of the present invention.
  • Table 14 and Table 15 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 40 of the embodiment of the present invention.
  • 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 40.
  • P2R2 1 0.275 / / P3R1 0 / / / P3R2 3 0.955 1.095 1.225 P4R1 3 0.955 1.115 1.245 P4R2 1 0.475 / /
  • FIG. 14 and 15 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 430 nm pass through the imaging optical lens 40 of the fourth embodiment.
  • FIG. 16 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 40 of the fourth embodiment.
  • the field curvature S in FIG. 16 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction. song.
  • Table 16 shows the corresponding values of various values in each of Examples 1, 2, 3, and 4 and the parameters that have been specified in the relational expressions.
  • the fourth embodiment satisfies various relational expressions.
  • the entrance pupil diameter ENPD of the imaging optical lens 30 is 3.441 mm
  • the full-field image height IH is 2.040 mm
  • the diagonal field angle FOV is 19.42°
  • the imaging optical lens 40 It meets the design requirements of long focal length and ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • Table 16 lists the values of the corresponding relational expressions in the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment according to the above-mentioned relational expressions, as well as the values of other related parameters.
  • Example 1 Example 2
  • Example 3 Example 4 v1/v4 2.71 3.73 2.71 4.23 f2/f -0.55 -1.09 -0.69 -1.20 f3/f -0.74 -0.41 -0.80 -0.31

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Abstract

本发明涉及光学镜头领域，公开了一种摄像光学镜头。该摄像光学镜头，由物侧至像侧依序包括：具有正屈折力的第一透镜、具有负屈折力的第二透镜、具有负屈折力的第三透镜及具有正屈折力的第四透镜；第一透镜的阿贝数v1，第四透镜的阿贝数v4，摄像光学镜头整体的焦距为f，第二透镜的焦距为f2，第三透镜的焦距为f3，第四透镜的物侧面的曲率半径为R7，第四透镜的像侧面的曲率半径为R8，第二透镜的像侧面到第三透镜的物侧面的轴上距离为d4，第三透镜的轴上厚度为d5，且满足下列关系式：2.70≤v1/v4≤4.30；-1.20≤f2/f≤-0.50；-0.80≤f3/f≤-0.30；-10.00≤（R7+R8）/（R7-R8）≤-2.00；3.00≤d4/d5≤10.00。该摄像光学镜头能在具有良好光学性能的同时，满足长焦距和超薄化的设计要求。

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-Oxide Semiconductor 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透镜结构。然而，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，四片式透镜结构逐渐出现在镜头设计当中，常见的四片式透镜虽然已经具有较好的光学性能，但是其焦距分配、透镜间距、透镜形状和色散系数设置仍然具有一定的不合理性，导致透镜结构无法满足具有良好光学性能的同时，满足长焦距和超薄化的设计要求。
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，其在具有良好光学性能的同时，满足长焦距和超薄化的设计要求。
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，由物侧至像侧依序包括：具有正屈折力的第一透镜、具有负屈折力的第二透镜、具有负屈折力的第三透镜及具有正屈折力的第四透镜；
所述第一透镜的阿贝数v1，所述第四透镜的阿贝数v4，所述摄像光学镜头整体的焦距为f，所述第二透镜的焦距为f2，所述第三透镜的焦距为f3，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，所述第二透镜的像侧面到所述第三透镜的物侧面的轴上距离为d4，所述第三透镜的轴上厚度为d5，且满足下列关系式：
2.70≤v1/v4≤4.30；
-1.20≤f2/f≤-0.50；
-0.80≤f3/f≤-0.30；
-10.00≤(R7+R8)/(R7-R8)≤-2.00；
3.00≤d4/d5≤10.00。
优选地，所述第二透镜的物侧面的曲率半径为R3，所述第二透镜的轴上厚度为d3，且满足下列关系式：
R3/d3≤-15.00。
优选地，所述第一透镜的物侧面的曲率半径为R1，所述第一透镜的像侧面的曲率半径为R2，且满足下列关系式：
-1.00≤R1/R2≤0。
优选地，所述第一透镜的焦距为f1，所述第一透镜的物侧面的曲率半径为R1，所述第一透镜的像侧面的曲率半径为R2，所述第一透镜的轴上厚度为d1，所述摄像光学镜头整体的光学总长为TTL，且满足下列关系式：
0.19≤f1/f≤0.71；
-1.98≤(R1+R2)/(R1-R2)≤0；
0.08≤d1/TTL≤0.25。
优选地，所述第二透镜的物侧面的曲率半径为R3，所述第二透镜的像侧面的曲率半径为R4，所述第二透镜的轴上厚度为d3，所述摄像光学镜头整体的光学总长为TTL，且满足下列关系式：
-2.46≤(R3+R4)/(R3-R4)≤1.50；
0.02≤d3/TTL≤0.10。
优选地，所述第三透镜的物侧面的曲率半径为R5，所述第三透镜的像侧面的曲率半径为R6，所述摄像光学镜头整体的光学总长为TTL，且满足下列关系式：
-6.22≤(R5+R6)/(R5-R6)≤0.41；
0.01≤d5/TTL≤0.07。
优选地，所述第四透镜的焦距为f4，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：
0.24≤f4/f≤2.73；
0.02≤d7/TTL≤0.11。
优选地，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
f/TTL≥1.06。
优选地，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：
0.33≤f12/f≤1.18。
优选地，所述第一透镜为玻璃材质。
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，且具有长焦距和超薄化的特性，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；
图13是本发明第四实施方式的摄像光学镜头的结构示意图；
图14是图13所示摄像光学镜头的轴向像差示意图；
图15是图13所示摄像光学镜头的倍率色差示意图；
图16是图13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包括四个透镜。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以及第四透镜L4。本实施方式中，优选的，在第四透镜L4和像面Si之间设置有玻璃平板GF等光学元件，其中玻璃平板GF可以是玻璃盖板，也可以是光学过滤片(filter)，当然在其他可实施方式中，玻璃平板GF还可以设置在其他位置。
本实施方式中，第一透镜L1具有正屈折力，第二透镜L2具有负屈折力，第三透镜L3具有负屈折力，第四透镜L4具有正屈折力。
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。
在此，定义第一透镜L1的阿贝数v1，第四透镜L4的阿贝数v4，摄像光学镜头10整体的焦距为f，第二透镜L2的焦距为f2，第三透镜L3的焦距为f3，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，第二透镜L2的像侧面到第三透镜L3的物侧面的轴上距离为d4，第三透镜L3的轴上厚度为d5，满足下列关系式：
2.70≤v1/v4≤4.30                            (1)
-1.20≤f2/f≤-0.50                            (2)
-0.80≤f3/f≤-0.30                            (3)
-10.00≤(R7+R8)/(R7-R8)≤-2.00                (4)
3.00≤d4/d5≤10.00                           (5)
关系式(1)规定了第一透镜L1和第四透镜L4色散系数的比值，在关系式范围内可以有效减小像差。
关系式(2)规定了第二透镜L2的焦距f2与系统总焦距f的比值，可以有效地平衡系统的球差以及场曲量。
关系式(3)规定了第三透镜L3的焦距f3与系统总焦距f的比值，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。
关系式(4)规定了第四透镜L4的形状，在关系式范围内时，随着超薄化的发展，有利于补正轴外画角的像差。
关系式(5)规定了第二透镜L2像侧面和第三透镜L3物侧面之间的轴上距离d4与第三透镜L3的轴上厚度d5的比值，在关系式范围内，有助于压 缩光学系统总长，实现超薄化效果。
定义第二透镜L2的物侧面的曲率半径为R3，第二透镜L2的轴上厚度为d3，且满足下列关系式：R3/d3≤-15.00。该关系式规定了第二透镜L2的物侧面的曲率半径R3与第二透镜L2的轴上厚度d3的比值，在关系式范围内，有助于提高光学系统性能。
定义第一透镜L1的物侧面的曲率半径为R1，第一透镜L1的像侧面的曲率半径为R2，且满足下列关系式：-1.00≤R1/R2≤0。该关系式规定了第一透镜L1的形状，在关系式范围内，可以缓和光线经过镜片的偏折程度，有效减小像差。
本实施方式中，所述第一透镜L1的物侧面于近轴处为凸面，像侧面于近轴处为凸面。
摄像光学镜头10整体的焦距为f，定义第一透镜L1的焦距为f1，且满足下列关系式：0.19≤f1/f≤0.71。该关系式规定了第一透镜L1的焦距与系统总焦距f的比值，在规定的范围内，第一透镜L1具有适当的正屈折力，有利于减小系统像差，同时有利于镜头向超薄化发展。优选地，满足0.30≤f1/f≤0.57。
第一透镜L1的物侧面的曲率半径为R1，第一透镜L1的像侧面的曲率半径为R2，且满足下列关系式：-1.98≤(R1+R2)/(R1-R2)≤0。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-1.24≤(R1+R2)/(R1-R2)≤0。
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：0.08≤d1/TTL≤0.25。在关系式范围内，有利于实现超薄化。优选地，满足0.12≤d1/TTL≤0.20。
本实施方式中，所述第二透镜L2的物侧面于近轴处为凹面，像侧面于近轴处为凹面。
定义第二透镜L2的物侧面的曲率半径为R3，第二透镜L2的像侧面的曲率半径为R4，满足下列关系式：-2.46≤(R3+R4)/(R3-R4)≤1.50。该关系式规定了第二透镜L2的形状，在关系式范围内时，随着镜头向超薄化发展，有利于补正轴上色像差问题。优选地，满足-1.54≤(R3+R4)/(R3-R4)≤1.20。
摄像光学镜头10的光学总长为TTL，定义第二透镜L2的轴上厚度为d3，满足下列关系式：0.02≤d3/TTL≤0.10。在关系式范围内，有利于实现超薄化。优选地，满足0.03≤d3/TTL≤0.08。
本实施方式中，所述第三透镜L3的物侧面于近轴处为凹面，像侧面于近轴处为凸面。
定义第三透镜L3的物侧面的曲率半径为R5，第三透镜L3的像侧面的曲 率半径为R6，满足下列关系式：-6.22≤(R5+R6)/(R5-R6)≤0.41。该关系式规定了第三透镜L3的形状，有利于第三透镜L3成型，在关系式规定范围内，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-3.89≤(R5+R6)/(R5-R6)≤0.33。
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：0.01≤d5/TTL≤0.07，在关系式范围内，有利于实现超薄化。优选地，满足0.02≤d5/TTL≤0.06。
本实施方式中，所述第四透镜L4的物侧面于近轴处为凸面，像侧面于近轴处为凹面。
摄像光学镜头10整体的焦距为f，定义第四透镜L4的焦距为f4，满足下列关系式：0.24≤f4/f≤2.73，通过正光焦度的合理分配，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0.39≤f4/f≤2.18。
摄像光学镜头10的光学总长为TTL，定义第四透镜L4的轴上厚度为d7，满足下列关系式：0.02≤d7/TTL≤0.11。在关系式范围内，有利于实现超薄化。优选地，0.03≤d7/TTL≤0.09。
本实施方式中，摄像光学镜头10整体的焦距为f，摄像光学镜头10的光学总长为TTL，满足下列关系式：f/TTL≥1.06，从而实现超薄化。本实施方式中，摄像光学镜头10整体的焦距为f，第一透镜L1与第二透镜L2的组合焦距为f12，满足下列关系式：0.33≤f12/f≤1.18。在关系式范围内，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。优选地，满足0.52≤f12/f≤0.94。
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，能够满足长焦距和超薄化的设计要求；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、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。
优选地，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 PCTCN2020094524-appb-000001
Figure PCTCN2020094524-appb-000002
上表中各符号的含义如下。
R：透镜中心处的曲率半径；
S1：光圈；
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：玻璃平板GF的物侧面的曲率半径；
R10：玻璃平板GF的像侧面的曲率半径；
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的像侧面到光学过滤片GF的物侧面的轴上距离；
d9：玻璃平板GF的轴上厚度；
d10：玻璃平板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；
ndg：玻璃平板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；
vg：玻璃平板GF的阿贝数。
表2示出了本发明第一实施方式提供的摄像光学镜头10的各透镜的非球面数据。
【表2】
Figure PCTCN2020094524-appb-000003
Figure PCTCN2020094524-appb-000004
其中，k是圆锥系数，A4、A6、A8、A10、A12、A14、A16是非球面系数。
y＝(x 2/R)/{1+[1-(1+k)(x 2/R 2)] 1/2}+A4x 4+A6x 6+A8x 8+A10x 10+A12x 12+A14x 14+A16x 16                        (6)
其中，x是非球面曲线上的点与光轴的垂直距离，y是非球面深度(非球面上距离光轴为x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)。
需要说明的是，本实施方式中各透镜的非球面优选的使用下述关系式(6)所示的非球面，但是，下述关系式(6)的具体形式仅为一个示例，实际上，并不限于关系式(6)中表示的非球面多项式形式。
表3示出本发明实施例的摄像光学镜头10中各透镜的反曲点设计数据。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。“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。
【表3】
  反曲点个数 反曲点位置1 反曲点位置2
P1R1 0 / /
P1R2 0 / /
P2R1 1 0.995 /
P2R2 0 / /
P3R1 0 / /
P3R2 2 0.925 1.075
P4R1 0 / /
P4R2 0 / /
图2、图3分别示出了波长为650nm、610nm、555nm、510nm、470nm和430nm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16示出了各实例1、2、3、4中各种数值与关系式中已规定的参数所对应的值。
如表16所示,第一实施方式满足各关系式。
在本实施方式中，所述摄像光学镜头10的入瞳直径ENPD为3.442mm，全视场像高IH为2.040mm，对角线方向的视场角FOV为19.60°，所述摄像光学镜头10满足长焦距和超薄化的设计要求，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)
图5是第二实施方式中摄像光学镜头20的结构示意图，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。
在本实施方式中，第一透镜L1为玻璃材质，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。
表4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4】
Figure PCTCN2020094524-appb-000005
表5示出了本发明第二实施方式的摄像光学镜头20的各透镜的非球面数据。
【表5】
Figure PCTCN2020094524-appb-000006
Figure PCTCN2020094524-appb-000007
表6、表7示出本发明实施例的摄像光学镜头20中各透镜的反曲点以及驻点设计数据。“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20光轴的垂直距离。
【表6】
  反曲点个数 反曲点位置1 反曲点位置2
P1R1 0 / /
P1R2 1 1.455 /
P2R1 1 1.075 /
P2R2 0 / /
P3R1 0 / /
P3R2 2 0.775 1.155
P4R1 1 1.195 /
P4R2 1 0.905 /
【表7】
  驻点个数 驻点位置1
P1R1 0 /
P1R2 0 /
P2R1 1 1.325
P2R2 0 /
P3R1 0 /
P3R2 1 1.045
P4R1 0 /
P4R2 0 /
图6、图7分别示出了波长为650nm、610nm、555nm、510nm、470nm和430nm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。
后出现的表16示出了各实例1、2、3、4中各种数值与关系式中已规定的参数所对应的值。
如表16所示,第二实施方式满足各关系式。
在本实施方式中，所述摄像光学镜头20的入瞳直径ENPD为3.441mm，全视场像高IH为2.040mm，对角线方向的视场角FOV为19.59°，所述摄像光学镜头20满足长焦距和超薄化的设计要求，其轴上、轴外色像差被充分补正，且具有优秀的光学特征，且具有优秀的光学特征。
(第三实施方式)
图9是第三实施方式中摄像光学镜头30的结构示意图，第三实施方式与第一实施方式基本相同。
表8示出了本发明第三实施方式的摄像光学镜头30的设计数据。
【表8】
Figure PCTCN2020094524-appb-000008
表9示出了本发明第三实施方式的摄像光学镜头30的各透镜的非球面数据。
【表9】
Figure PCTCN2020094524-appb-000009
表10、表11示出本发明实施例的摄像光学镜头30中各透镜的反曲点以及驻点设计数据。“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30光轴的垂直距离。
【表10】
  反曲点个数 反曲点位置1 反曲点位置2
P1R1 0 / /
P1R2 0 / /
P2R1 0 / /
P2R2 1 0.745 /
P3R1 0 / /
P3R2 2 0.435 0.795
P4R1 1 0.615 /
P4R2 1 0.515 /
【表11】
  驻点个数 驻点位置1
P1R1 0 /
P1R2 0 /
P2R1 0 /
P2R2 1 1.365
P3R1 0 /
P3R2 0 /
P4R1 1 1.055
P4R2 1 0.965
图10、图11分别示出了波长为650nm、610nm、555nm、510nm、470nm和430nm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。
后出现的表16示出了各实例1、2、3、4中各种数值与关系式中已规定的参数所对应的值。
如表16所示,第三实施方式满足各关系式。
在本实施方式中，所述摄像光学镜头30的入瞳直径ENPD为3.441mm，全视场像高IH为2.040mm，对角线方向的视场角FOV为19.77°，所述摄像光学镜头30满足长焦距和超薄化的设计要求，其轴上、轴外色像差被充分补正，且具有优秀的光学特征。
(第四实施方式)
图13是第四实施方式中摄像光学镜头40的结构示意图，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。
其中，本实施方式中，第二透镜L2的像侧面于近轴处为凸面，第三透镜L3的像侧面于近轴处为凹面。
在本实施方式中，第一透镜L1为玻璃材质，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。
表12示出了本发明第四实施方式的摄像光学镜头40的设计数据。
【表12】
Figure PCTCN2020094524-appb-000010
Figure PCTCN2020094524-appb-000011
表13示出了本发明第四实施方式的摄像光学镜头40的各透镜的非球面数据。
【表13】
Figure PCTCN2020094524-appb-000012
表14、表15示出本发明实施例的摄像光学镜头40中各透镜的反曲点以及驻点设计数据。“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40光轴的垂直距离。
【表14】
  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 3 0.495 0.805 1.255
P2R1 1 1.055 / /
P2R2 1 0.275 / /
P3R1 0 / / /
P3R2 3 0.955 1.095 1.225
P4R1 3 0.955 1.115 1.245
P4R2 1 0.475 / /
【表15】
  驻点个数 驻点位置1
P1R1 0 /
P1R2 1 1.385
P2R1 0 /
P2R2 1 0.455
P3R1 0 /
P3R2 0 /
P4R1 0 /
P4R2 1 0.925
图14、图15分别示出了波长为650nm、610nm、555nm、510nm、470nm和430nm的光经过第四实施方式的摄像光学镜头40后的轴向像差以及倍率色差示意图。图16则示出了，波长为555nm的光经过第四实施方式的摄像光学镜头40后的场曲及畸变示意图，图16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16示出了各实例1、2、3、4中各种数值与关系式中已规定的参数所对应的值。
如表16所示,第四实施方式满足各关系式。
在本实施方式中，所述摄像光学镜头30的入瞳直径ENPD为3.441mm，全视场像高IH为2.040mm，对角线方向的视场角FOV为19.42°，所述摄像光学镜头40满足长焦距和超薄化的设计要求，其轴上、轴外色像差被充分补正，且具有优秀的光学特征。
以下表16按照上述关系式列出了第一实施方式、第二实施方式、第三实施方式、第四实施方式中对应各关系式的数值，以及其他相关参数的取值。
【表16】
参数及关系式 实施例1 实施例2 实施例3 实施例4
v1/v4 2.71 3.73 2.71 4.23
f2/f -0.55 -1.09 -0.69 -1.20
f3/f -0.74 -0.41 -0.80 -0.31
(R7+R8)/(R7-R8) -8.90 -2.69 -9.95 -2.02
d4/d5 8.65 4.94 9.95 3.02
f 11.704 11.700 11.700 11.699
f1 4.440 5.458 4.864 5.534
f2 -6.426 -12.744 -8.068 -14.017
f3 -8.622 -4.792 -9.337 -3.569
f4 16.628 8.441 21.278 5.721
f12 9.101 7.867 9.190 7.645
FNO 3.40 3.40 3.40 3.40
TTL 10.280 10.280 11.000 10.001
FOV 19.60 19.59 19.77 19.42
IH 2.040 2.040 2.040 2.040
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，由物侧至像侧依序包括：具有正屈折力的第一透镜、具有负屈折力的第二透镜、具有负屈折力的第三透镜及具有正屈折力的第四透镜；
    所述第一透镜的阿贝数v1，所述第四透镜的阿贝数v4，所述摄像光学镜头整体的焦距为f，所述第二透镜的焦距为f2，所述第三透镜的焦距为f3，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，所述第二透镜的像侧面到所述第三透镜的物侧面的轴上距离为d4，所述第三透镜的轴上厚度为d5，且满足下列关系式：
    2.70≤v1/v4≤4.30；
    -1.20≤f2/f≤-0.50；
    -0.80≤f3/f≤-0.30；
    -10.00≤(R7+R8)/(R7-R8)≤-2.00；
    3.00≤d4/d5≤10.00。
  2. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第二透镜的物侧面的曲率半径为R3，所述第二透镜的轴上厚度为d3，且满足下列关系式：
    R3/d3≤-15.00。
  3. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第一透镜的物侧面的曲率半径为R1，所述第一透镜的像侧面的曲率半径为R2，且满足下列关系式：
    -1.00≤R1/R2≤0。
  4. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第一透镜的焦距为f1，所述第一透镜的物侧面的曲率半径为R1，所述第一透镜的像侧面的曲率半径为R2，所述第一透镜的轴上厚度为d1，所述摄像光学镜头整体的光学总长为TTL，且满足下列关系式：
    0.19≤f1/f≤0.71；
    -1.98≤(R1+R2)/(R1-R2)≤0；
    0.08≤d1/TTL≤0.25。
  5. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第二透镜的物侧面的曲率半径为R3，所述第二透镜的像侧面的曲率半径为R4，所述第二透镜的轴上厚度为d3，所述摄像光学镜头整体的光学总长为TTL，且满足下列关系式：
    -2.46≤(R3+R4)/(R3-R4)≤1.50；
    0.02≤d3/TTL≤0.10。
  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的曲率半径为R5，所述第三透镜的像侧面的曲率半径为R6，所述摄像光学镜头整体的光学总长为TTL，且满足下列关系式：
    -6.22≤(R5+R6)/(R5-R6)≤0.41；
    0.01≤d5/TTL≤0.07。
  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，所述摄像光学镜头的光学总长为TTL，且满足下列关系式：
    0.24≤f4/f≤2.73；
    0.02≤d7/TTL≤0.11。
  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光学总长为TTL，且满足下列关系式：
    f/TTL≥1.06。
  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：
    0.33≤f12/f≤1.18。
  10. 根据权利要求1所述的摄像光学镜头，其特征在于，所述第一透镜为玻璃材质。
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