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WO2019019626A1 - 成像镜头 - Google Patents

成像镜头 Download PDF

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Publication number
WO2019019626A1
WO2019019626A1 PCT/CN2018/077205 CN2018077205W WO2019019626A1 WO 2019019626 A1 WO2019019626 A1 WO 2019019626A1 CN 2018077205 W CN2018077205 W CN 2018077205W WO 2019019626 A1 WO2019019626 A1 WO 2019019626A1
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Prior art keywords
lens
imaging
imaging lens
focal length
effective focal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/077205
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English (en)
French (fr)
Inventor
黄林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sunny Optics Co Ltd
Original Assignee
Zhejiang Sunny Optics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201720905647.8U external-priority patent/CN207336900U/zh
Priority claimed from CN201710611433.4A external-priority patent/CN107219610B/zh
Application filed by Zhejiang Sunny Optics Co Ltd filed Critical Zhejiang Sunny Optics Co Ltd
Priority to US16/211,443 priority Critical patent/US10866391B2/en
Publication of WO2019019626A1 publication Critical patent/WO2019019626A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present application relates to an imaging lens, and more particularly, to a large-aperture, wide-angle imaging lens including four lenses.
  • CMOS complementary metal oxide semiconductor
  • the number of apertures Fno (the total effective focal length of the lens / the entrance pupil diameter of the lens) of the existing lens is generally 2.0 or more.
  • the lens needs to have a large amount of light to ensure image quality.
  • the number of apertures Fno is 2.0 or more, and the lens cannot meet the higher-order imaging requirements.
  • the present application provides an imaging lens that can be adapted to at least one of the above-described disadvantages of the prior art, such as a large aperture, wide-angle lens, that is applicable to portable electronic products.
  • One aspect of the present application provides an imaging lens that includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a fourth lens.
  • the object side of the first lens may be a concave surface
  • the image side of the fourth lens may be a concave surface
  • the second lens may have a positive power
  • at least one of the first lens, the third lens, and the fourth lens may have a negative power
  • the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy f3/f4>0.
  • the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy 0 ⁇ f3/f4 ⁇ 1.
  • the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens may satisfy f/EPD ⁇ 2.
  • a half of the diagonal length ImgH of the effective pixel area on the imaging surface of the imaging lens and the total effective focal length f of the imaging lens may satisfy ImgH/f>1.
  • the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens satisfy 1.2 ⁇
  • the first lens can have a negative power.
  • the combined power of the first lens and the second lens may be a negative power
  • the combined focal length f12 and the total effective focal length f of the imaging lens may satisfy -8 ⁇ f12/f ⁇ -3.
  • the radius of curvature R3 of the side surface of the second lens object and the radius of curvature R6 of the side surface of the third lens image may satisfy -1.2 ⁇ R3 / R6 ⁇ -0.5.
  • the object side of the fourth lens may be convex.
  • At least one of the object side and the image side of the first lens may have at least one inflection point.
  • the radius of curvature R6 of the side of the third lens image and the total effective focal length f of the imaging lens may satisfy -1.2 ⁇ R6 / f ⁇ -0.7.
  • the radius of curvature R6 of the side of the third lens image and the effective focal length f3 of the third lens may satisfy -1 ⁇ R6/f3 ⁇ -0.5.
  • the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis may satisfy 0.3 ⁇ ET4/CT4 ⁇ 0.9.
  • One aspect of the present application provides an imaging lens that includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a fourth lens.
  • the first lens may have a positive power or a negative power
  • the object side may be a concave surface
  • the second lens may have a positive power
  • the third lens has a positive power or a negative power
  • the fourth lens has a positive power Or a negative power
  • the image side may be a concave surface
  • the combined power of the first lens and the second lens may be a negative power, and the combined focal length f12 and the total effective focal length f of the imaging lens may satisfy -8 ⁇ F12/f ⁇ -3.
  • the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens may satisfy 1.2 ⁇
  • the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy f3/f4>0.
  • both the third lens and the fourth lens may have positive power.
  • the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy 0 ⁇ f3/f4 ⁇ 1.
  • the radius of curvature R3 of the side surface of the second lens object and the radius of curvature R6 of the side surface of the third lens image may satisfy -1.2 ⁇ R3 / R6 ⁇ -0.5.
  • At least one of the object side and the image side of the first lens may have at least one inflection point.
  • the object side of the second lens may be convex
  • the image side of the third lens may be convex
  • the object side of the fourth lens may be convex.
  • the radius of curvature R6 of the side of the third lens image and the total effective focal length f of the imaging lens may satisfy -1.2 ⁇ R6 / f ⁇ -0.7.
  • the radius of curvature R6 of the side of the third lens image and the effective focal length f3 of the third lens may satisfy -1 ⁇ R6/f3 ⁇ -0.5.
  • the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis may satisfy 0.3 ⁇ ET4/CT4 ⁇ 0.9.
  • a half of the diagonal length ImgH of the effective pixel area on the imaging surface of the imaging lens and the total effective focal length f of the imaging lens may satisfy ImgH/f>1.
  • the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens may satisfy f/EPD ⁇ 2.
  • One aspect of the present application provides an imaging lens that includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, and a fourth lens.
  • the first lens has a positive power or a negative power, and the object side may be a concave surface; the second lens may have a positive power; the third lens has a positive power or a negative power; and the fourth lens has a positive power or Negative power, the image side can be concave.
  • the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis may satisfy 0.3 ⁇ ET4/CT4 ⁇ 0.9.
  • the imaging lens configured by the above configuration can have at least one advantageous effect such as ultra-thin, miniaturization, large aperture, low sensitivity, wide angle, high phase contrast, high imaging quality, and the like.
  • FIG. 1 is a schematic structural view of an imaging lens according to Embodiment 1 of the present application.
  • 2A to 2C respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of Embodiment 1;
  • FIG. 3 is a schematic structural view of an imaging lens according to Embodiment 2 of the present application.
  • 4A to 4C respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of Embodiment 2.
  • FIG. 5 is a schematic structural view of an imaging lens according to Embodiment 3 of the present application.
  • 6A to 6C respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of Embodiment 3;
  • FIG. 7 is a schematic structural view of an imaging lens according to Embodiment 4 of the present application.
  • 8A to 8C respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of Embodiment 4;
  • FIG. 9 is a schematic structural view of an imaging lens according to Embodiment 5 of the present application.
  • 10A to 10C respectively show axial chromatic aberration curves, astigmatism curves, and distortion curves of the imaging lens of Embodiment 5.
  • FIG. 11 is a schematic structural view of an imaging lens according to Embodiment 6 of the present application.
  • 12A to 12C respectively show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging lens of Embodiment 6.
  • first, second, third, etc. are used to distinguish one feature from another, and do not represent any limitation of the feature.
  • first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
  • the thickness, size, and shape of the lens have been somewhat exaggerated for convenience of explanation.
  • the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the spherical or aspherical shape shown in the drawings.
  • the drawings are only examples and are not to scale.
  • a paraxial region refers to a region near the optical axis. If the surface of the lens is convex and the position of the convex surface is not defined, it indicates that the surface of the lens is convex at least in the paraxial region; if the surface of the lens is concave and the position of the concave surface is not defined, it indicates that the surface of the lens is at least in the paraxial region. Concave.
  • the surface closest to the object in each lens is referred to as the object side, and the surface of each lens closest to the image plane is referred to as the image side.
  • the imaging lens includes, for example, four lenses having powers, that is, a first lens, a second lens, a third lens, and a fourth lens.
  • the imaging lens may further include a photosensitive member disposed on the imaging surface.
  • the first lens has a positive power or a negative power
  • the object side may be a concave surface
  • the second lens may have a positive power
  • the third lens has a positive power or a negative power
  • the fourth lens has a positive power Or negative power, the side can be concave.
  • At least one of the object side and the image side of the first lens has at least one inflection point.
  • the object side of the fourth lens may be convex. Arranging the object side of the fourth lens as a convex surface is advantageous for reducing the chief ray angle and improving the contrast on the image plane.
  • the first lens can have a negative power.
  • the combined power of the first lens and the second lens may be a negative power, and the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the imaging lens may satisfy -8 ⁇ f12/f ⁇ - 3. More specifically, f12 and f further satisfy -7.56 ⁇ f12 / f ⁇ -3.05. Reasonable allocation of f12 and f can improve the resolution of the lens.
  • the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens may satisfy 1.2 ⁇
  • the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens may satisfy f3/f4>0, and more specifically, f3 and f4 may further satisfy 0 ⁇ f3/f4 ⁇ 1, for example, 0.24 ⁇ f3/f4 ⁇ 0.66.
  • both the third lens and the fourth lens may have positive power.
  • the radius of curvature R3 of the side surface of the second lens object and the radius of curvature R6 of the side surface of the third lens image may satisfy -1.2 ⁇ R3/R6 ⁇ -0.5, and more specifically, R3 and R6 may further satisfy -1.00 ⁇ R3/R6 ⁇ -0.71.
  • Reasonable control of the radius of curvature of the side of the second lens and the side of the third lens image can effectively reduce the sensitivity of the system. Satisfying the conditional expression -1.2 ⁇ R3/R6 ⁇ -0.5 is also advantageous for achieving large aperture and high resolution.
  • the radius of curvature R6 of the side surface of the third lens image and the total effective focal length f of the imaging lens may satisfy -1.2 ⁇ R6 / f ⁇ -0.7, and more specifically, R6 and f may further satisfy -1.13 ⁇ R6 / f ⁇ -0.84 .
  • the radius of curvature R6 of the side of the third lens image and the effective focal length f3 of the third lens may satisfy -1 ⁇ R6/f3 ⁇ -0.5, and more specifically, R6 and f3 may further satisfy -0.64 ⁇ R6/f3 ⁇ -0.51 .
  • the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis may satisfy 0.3 ⁇ ET4 / CT4 ⁇ 0.9, and more specifically, ET4 and CT4 may further satisfy 0.31 ⁇ ET4 / CT4 ⁇ 0.82.
  • the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens can satisfy f/EPD ⁇ 2, and more specifically, f and EPD can further satisfy f/EPD ⁇ 1.3, for example, 1.18 ⁇ f/EPD ⁇ 1.19. .
  • the reduction of the aperture number Fno ie, the total effective focal length of the lens f/the diameter of the lens into the EPD
  • the lens can have a large aperture advantage in the process of increasing the amount of light passing through, thereby improving the imaging effect in a dark environment while improving edge ray aberration.
  • ImgH/f>1 can be satisfied between the half of the effective pixel area of the photosensitive element on the imaging surface of the imaging lens, ImgH, and the total effective focal length f of the imaging lens. More specifically, ImgH and f can further satisfy 1.15 ⁇ ImgH. /f ⁇ 1.30, to achieve imaging of the larger object side space by the photosensitive element.
  • the imaging lens configured by the above configuration can have a large angle of view.
  • the maximum half angle of view HFOV can satisfy 51.77° ⁇ HFOV ⁇ 55.86°, which embodies the wide-angle characteristics of the lens.
  • the optical imaging lens may also be provided with at least one aperture.
  • the aperture may be disposed at any position between the object side and the image side as needed.
  • the diaphragm may be disposed between the second lens and the third lens to improve the imaging quality of the lens.
  • the object side surface of the second lens may be a convex surface
  • the image side surface of the third lens may be a convex surface.
  • the optical imaging lens may further include a filter for correcting the color deviation and/or a cover glass for protecting the photosensitive element on the imaging surface.
  • the imaging lens described above employs, for example, four lenses, which can effectively avoid the problem of excessive lens volume and excessive mass due to an excessive number of lenses, and is advantageous for miniaturization and weight reduction of the lens.
  • the lens sensitivity can be reduced while the lens is miniaturized, and the lens processability can be improved.
  • the imaging lens is more advantageous for production processing and can be applied to portable electronic products.
  • the imaging lens of the above configuration can also have advantageous effects such as ultrathin, large aperture, wide angle, high phase contrast, high image quality, and the like.
  • each lens may employ an aspherical lens to improve distortion and improve astigmatic aberration, thereby further improving image quality.
  • the imaging lens is not limited to including four lenses.
  • the imaging lens can also include other numbers of lenses if desired.
  • FIG. 1 is a block diagram showing the structure of an imaging lens according to Embodiment 1 of the present application.
  • the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an imaging surface S11 from the object side to the imaging side along the optical axis.
  • the imaging lens may further include a photosensitive element disposed on the imaging surface S11.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 is a concave surface
  • the image side surface S2 is a concave surface
  • the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical surfaces.
  • the second lens L2 has a positive refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface
  • the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.
  • the third lens L3 has a positive refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a convex surface
  • the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.
  • the fourth lens L4 has a positive refractive power
  • the object side surface S7 is a convex surface
  • the image side surface S8 is a concave surface
  • the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.
  • the imaging lens may further include a filter L5 having an object side S9 and an image side S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • the imaging lens may further include a stop STO disposed between the second lens L2 and the third lens L3 to improve the imaging quality of the imaging lens.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the imaging lens of Example 1, in which the unit of curvature radius and thickness are both millimeters (mm).
  • each lens may be an aspherical lens, and each aspherical surface type x is defined by the following formula:
  • x is the distance of the aspherical surface at height h from the optical axis, and the distance from the aspherical vertex is high;
  • k is the conic coefficient (given in Table 1);
  • Ai is the correction coefficient of the a-th order of the aspherical surface.
  • Table 2 gives the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 and A 16 which can be used for the respective aspherical mirror faces S1 - S8 in the embodiment 1.
  • Table 3 below gives the total effective focal length f of the imaging lens of Embodiment 1, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging lens imaging surface S11, ImgH, and the maximum of the imaging lens.
  • the half angle of view HFOV and the aperture number of the imaging lens Fno ie, f/EPD).
  • 2A shows an axial chromatic aberration curve of the imaging lens of Embodiment 1, which indicates that light of different wavelengths is deviated from a focus point after the lens.
  • 2B shows an astigmatism curve of the imaging lens of Embodiment 1, which shows meridional field curvature and sagittal image plane curvature.
  • 2C shows a distortion curve of the imaging lens of Embodiment 1, which shows distortion magnitude values in the case of different viewing angles.
  • the imaging lens given in Embodiment 1 can achieve good imaging quality.
  • FIG. 3 is a block diagram showing the structure of an imaging lens according to Embodiment 2 of the present application.
  • the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an imaging surface S11 from the object side to the imaging side along the optical axis.
  • the imaging lens may further include a photosensitive element disposed on the imaging surface S11.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 is a concave surface
  • the image side surface S2 is a concave surface
  • the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical surfaces.
  • the second lens L2 has a positive refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface
  • the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.
  • the third lens L3 has a positive refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a convex surface
  • the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.
  • the fourth lens L4 has a positive refractive power
  • the object side surface S7 is a convex surface
  • the image side surface S8 is a concave surface
  • the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.
  • the imaging lens may further include a filter L5 having an object side S9 and an image side S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • the imaging lens may further include a stop STO disposed between the second lens L2 and the third lens L3 to improve the imaging quality of the imaging lens.
  • Table 4 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the imaging lens of Example 2, wherein the units of the radius of curvature and the thickness are all in millimeters (mm).
  • Table 5 shows the high order coefficient which can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 6 shows the total effective focal length f of the imaging lens in Example 2, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging lens imaging surface S11, ImgH, and the maximum of the imaging lens. The half angle of view HFOV and the aperture number Fno of the imaging lens.
  • 4A shows an axial chromatic aberration curve of the imaging lens of Embodiment 2, which indicates that light of different wavelengths is deviated from a focus point after the lens.
  • 4B shows an astigmatism curve of the imaging lens of Embodiment 2, which shows meridional field curvature and sagittal image plane curvature.
  • 4C shows a distortion curve of the imaging lens of Embodiment 2, which shows distortion magnitude values in the case of different viewing angles.
  • the imaging lens given in Embodiment 2 can achieve good imaging quality.
  • FIG. 5 is a block diagram showing the structure of an imaging lens according to Embodiment 3 of the present application.
  • the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an imaging surface S11 from the object side to the imaging side along the optical axis.
  • the imaging lens may further include a photosensitive element disposed on the imaging surface S11.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 is a concave surface
  • the image side surface S2 is a convex surface
  • the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.
  • the second lens L2 has a positive refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface
  • the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.
  • the third lens L3 has a positive refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a convex surface
  • the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.
  • the fourth lens L4 has a positive refractive power
  • the object side surface S7 is a convex surface
  • the image side surface S8 is a concave surface
  • the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.
  • the imaging lens may further include a filter L5 having an object side S9 and an image side S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • the imaging lens may further include a stop STO disposed between the second lens L2 and the third lens L3 to improve the imaging quality of the imaging lens.
  • Table 7 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the imaging lens of Example 3, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 8 shows the high order term coefficients which can be used for the respective aspherical mirrors in Embodiment 3, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 9 shows the total effective focal length f of the imaging lens in Embodiment 3, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging lens imaging surface S11, ImgH, and the maximum of the imaging lens. The half angle of view HFOV and the aperture number Fno of the imaging lens.
  • Fig. 6A shows an axial chromatic aberration curve of the imaging lens of Embodiment 3, which indicates that light of different wavelengths is deviated from a focus point after the lens.
  • Fig. 6B shows an astigmatism curve of the imaging lens of Embodiment 3, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 6C shows a distortion curve of the imaging lens of Embodiment 3, which shows distortion magnitude values in the case of different viewing angles. 6A to 6C, the imaging lens given in Embodiment 3 can achieve good imaging quality.
  • FIG. 7 is a block diagram showing the structure of an imaging lens according to Embodiment 4 of the present application.
  • the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an imaging surface S11 from the object side to the imaging side along the optical axis.
  • the imaging lens may further include a photosensitive element disposed on the imaging surface S11.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 is a concave surface
  • the image side surface S2 is a convex surface
  • the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.
  • the second lens L2 has a positive refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface
  • the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.
  • the third lens L3 has a positive refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a convex surface
  • the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.
  • the fourth lens L4 has a positive refractive power
  • the object side surface S7 is a convex surface
  • the image side surface S8 is a concave surface
  • the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.
  • the imaging lens may further include a filter L5 having an object side S9 and an image side S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • the imaging lens may further include a stop STO disposed between the second lens L2 and the third lens L3 to improve the imaging quality of the imaging lens.
  • Table 10 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the imaging lens of Example 4, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 11 shows the high order coefficient which can be used for each aspherical mirror in Embodiment 4, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 12 shows the total effective focal length f of the imaging lens in Example 4, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging lens imaging surface S11, ImgH, and the maximum of the imaging lens. The half angle of view HFOV and the aperture number Fno of the imaging lens.
  • Fig. 8A shows an axial chromatic aberration curve of the imaging lens of Embodiment 4, which shows that light of different wavelengths is deviated from a focus point after the lens.
  • Fig. 8B shows an astigmatism curve of the imaging lens of Embodiment 4, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 8C shows a distortion curve of the imaging lens of Embodiment 4, which shows distortion magnitude values in the case of different viewing angles. 8A to 8C, the imaging lens given in Embodiment 4 can achieve good imaging quality.
  • FIG. 9 is a view showing the configuration of an imaging lens according to Embodiment 5 of the present application.
  • the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an imaging surface S11 from the object side to the imaging side along the optical axis.
  • the imaging lens may further include a photosensitive element disposed on the imaging surface S11.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 is a concave surface
  • the image side surface S2 is a convex surface
  • the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.
  • the second lens L2 has a positive refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface
  • the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.
  • the third lens L3 has a positive refractive power
  • the object side surface S5 is a convex surface
  • the image side surface S6 is a convex surface
  • the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.
  • the fourth lens L4 has a positive refractive power
  • the object side surface S7 is a convex surface
  • the image side surface S8 is a concave surface
  • the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.
  • the imaging lens may further include a filter L5 having an object side S9 and an image side S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • the imaging lens may further include a stop STO disposed between the second lens L2 and the third lens L3 to improve the imaging quality of the imaging lens.
  • Table 13 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the imaging lens of Example 5, in which the unit of the radius of curvature and the thickness are each mm (mm).
  • Table 14 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 5, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 15 shows the total effective focal length f of the imaging lens in Example 5, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging lens imaging surface S11, ImgH, and the maximum of the imaging lens. The half angle of view HFOV and the aperture number Fno of the imaging lens.
  • Fig. 10A shows an axial chromatic aberration curve of the imaging lens of Embodiment 5, which shows that light of different wavelengths is deviated from a focus point after the lens.
  • Fig. 10B shows an astigmatism curve of the imaging lens of Embodiment 5, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 10C shows a distortion curve of the imaging lens of Embodiment 5, which shows the distortion magnitude value in the case of different viewing angles. 10A to 10C, the imaging lens given in Embodiment 5 can achieve good imaging quality.
  • FIG. 11 is a view showing the configuration of an imaging lens according to Embodiment 6 of the present application.
  • the imaging lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an imaging surface S11 from the object side to the imaging side along the optical axis.
  • the imaging lens may further include a photosensitive element disposed on the imaging surface S11.
  • the first lens L1 has a negative refractive power
  • the object side surface S1 is a concave surface
  • the image side surface S2 is a concave surface
  • the object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical surfaces.
  • the second lens L2 has a positive refractive power
  • the object side surface S3 is a convex surface
  • the image side surface S4 is a concave surface
  • the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.
  • the third lens L3 has a positive refractive power
  • the object side surface S5 is a concave surface
  • the image side surface S6 is a convex surface
  • the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.
  • the fourth lens L4 has a positive refractive power
  • the object side surface S7 is a convex surface
  • the image side surface S8 is a concave surface
  • the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.
  • the imaging lens may further include a filter L5 having an object side S9 and an image side S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • the imaging lens may further include a stop STO disposed between the second lens L2 and the third lens L3 to improve the imaging quality of the imaging lens.
  • Table 16 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the imaging lens of Example 6, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 17 shows the high order coefficient which can be used for each aspherical mirror surface in Embodiment 6, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 18 shows the total effective focal length f of the imaging lens in Example 6, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging lens imaging surface S11, ImgH, and the maximum of the imaging lens. The half angle of view HFOV and the aperture number Fno of the imaging lens.
  • Fig. 12A shows an axial chromatic aberration curve of the imaging lens of Embodiment 6, which indicates that light of different wavelengths is deviated from a focus point after the lens.
  • Fig. 12B shows an astigmatism curve of the imaging lens of Embodiment 6, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 12C shows a distortion curve of the imaging lens of Embodiment 6, which shows the distortion magnitude value in the case of different viewing angles. 12A to 12C, the imaging lens given in Embodiment 6 can achieve good imaging quality.
  • Embodiments 1 to 6 respectively satisfy the relationships shown in Table 19 below.
  • the present application also provides an image forming apparatus whose electronic photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).
  • the imaging device may be a stand-alone imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone.
  • the imaging device is equipped with the imaging lens described above.

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Abstract

一种成像镜头，该成像镜头沿光轴由物侧至像侧依序包括：第一透镜（L1）、第二透镜（L2）、第三透镜（L3）和第四透镜（L4）。第一透镜（L1）的物侧面为凹面，第四透镜（L4）的像侧面为凹面；第二透镜（L2）具有正光焦度；第一透镜（L1）、第三透镜（L3）和第四透镜（L4）中的至少一个具有负光焦度；第三透镜（L3）的有效焦距f3与第四透镜（L4）的有效焦距f4满足f3/f4＞0。

Description

成像镜头
相关申请的交叉引用
本申请要求于2017年7月25日提交于中国国家知识产权局(SIPO)的、专利申请号为201710611433.4的中国专利申请以及于2017年7月25日提交至SIPO的、专利申请号为201720905647.8的中国专利申请的优先权和权益，以上中国专利申请通过引用整体并入本文。
技术领域
本申请涉及一种成像镜头，更具体地，本申请涉及一种包括四片透镜的大孔径、广角成像镜头。
背景技术
随着例如感光耦合元件(CCD)或互补性氧化金属半导体元件(CMOS)等常用感光元件性能的提高及尺寸的减小，使得感光元件的性能提高及尺寸减小，从而对于相配套的成像镜头的高成像品质及小型化提出了更高的要求。
同时，随着智能手机、深度探测相机等便携式电子产品的不断发展，对成像镜头的小型化和高成像质量也提出了更高的要求。为了满足结构紧凑和高成像质量等要求，现有镜头通常配置的光圈数Fno(镜头的总有效焦距/镜头的入瞳直径)均在2.0或2.0以上。但是，在光线不足(如阴雨天、黄昏等)，手抖等情况下，镜头需要具有较大的通光量才能确保成像品质。此时，光圈数Fno为2.0或2.0以上镜头已经无法满足更高阶的成像要求。
发明内容
本申请提供了可适用于便携式电子产品的、可至少解决或部分解决现有技术中的上述至少一个缺点的成像镜头，例如，大孔径、广角镜头。
本申请的一个方面提供了这样一种成像镜头，该镜头沿光轴由物侧至像侧依序包括：第一透镜、第二透镜、第三透镜和第四透镜。第一透镜的物侧面可为凹面，第四透镜的像侧面可为凹面；第二透镜可具有正光焦度；第一透镜、第三透镜和第四透镜中的至少一个可具有负光焦度；第三透镜的有效焦距f3与第四透镜的有效焦距f4可满足f3/f4＞0。
在一个实施方式中，第三透镜的有效焦距f3与第四透镜的有效焦距f4可满足0＜f3/f4＜1。
在一个实施方式中，成像镜头的总有效焦距f与成像镜头的入瞳直径EPD可满足f/EPD＜2。
在一个实施方式中，成像镜头成像面上有效像素区域对角线长的一半ImgH与成像镜头的总有效焦距f可满足ImgH/f＞1。
在一个实施方式中，第三透镜的有效焦距f3与成像镜头的总有效焦距f满足1.2＜|f3/f|＜2.3。
在一个实施方式中，第一透镜可具有负光焦度。
在一个实施方式中，第一透镜和第二透镜的组合光焦度可为负光焦度，其组合焦距f12与成像镜头的总有效焦距f可满足-8＜f12/f＜-3。
在一个实施方式中，第二透镜物侧面的曲率半径R3与第三透镜像侧面的曲率半径R6可满足-1.2＜R3/R6＜-0.5。
在一个实施方式中，第四透镜的物侧面可为凸面。
在一个实施方式中，第一透镜的物侧面和像侧面中的至少一个可具有至少一个反曲点。
在一个实施方式中，第三透镜像侧面的曲率半径R6与成像镜头的总有效焦距f可满足-1.2＜R6/f＜-0.7。
在一个实施方式中，第三透镜像侧面的曲率半径R6与第三透镜的有效焦距f3可满足-1＜R6/f3＜-0.5。
在一个实施方式中，第四透镜的边缘厚度ET4与第四透镜于光轴上的中心厚度CT4可满足0.3＜ET4/CT4＜0.9。
本申请的一个方面提供了这样一种成像镜头，该镜头沿光轴由物侧至像侧依序包括：第一透镜、第二透镜、第三透镜和第四透镜。第 一透镜可具有正光焦度或负光焦度，其物侧面可为凹面；第二透镜可具有正光焦度；第三透镜具有正光焦度或负光焦度；第四透镜具有正光焦度或负光焦度，其像侧面可为凹面；以及第一透镜和第二透镜的组合光焦度可为负光焦度，其组合焦距f12与成像镜头的总有效焦距f可满足-8＜f12/f＜-3。
在一个实施方式中，第三透镜的有效焦距f3与成像镜头的总有效焦距f可满足1.2＜|f3/f|＜2.3。
在一个实施方式中，第三透镜的有效焦距f3与第四透镜的有效焦距f4可满足f3/f4＞0。
在一个实施方式中，第三透镜和第四透镜均可具有正光焦度。
在一个实施方式中，第三透镜的有效焦距f3与第四透镜的有效焦距f4可满足0＜f3/f4＜1。
在一个实施方式中，第二透镜物侧面的曲率半径R3与第三透镜像侧面的曲率半径R6可满足-1.2＜R3/R6＜-0.5。
在一个实施方式中，第一透镜的物侧面和像侧面中的至少一个可具有至少一个反曲点。
在一个实施方式中，第二透镜的物侧面可为凸面，第三透镜的像侧面可为凸面。
在一个实施方式中，第四透镜的物侧面可为凸面。
在一个实施方式中，第三透镜像侧面的曲率半径R6与成像镜头的总有效焦距f可满足-1.2＜R6/f＜-0.7。
在一个实施方式中，第三透镜像侧面的曲率半径R6与第三透镜的有效焦距f3可满足-1＜R6/f3＜-0.5。
在一个实施方式中，第四透镜的边缘厚度ET4与第四透镜于光轴上的中心厚度CT4可满足0.3＜ET4/CT4＜0.9。
在一个实施方式中，成像镜头成像面上有效像素区域对角线长的一半ImgH与成像镜头的总有效焦距f可满足ImgH/f＞1。
在一个实施方式中，成像镜头的总有效焦距f与成像镜头的入瞳直径EPD可满足f/EPD＜2。
本申请的一个方面提供了这样一种成像镜头，该镜头沿光轴由物 侧至像侧依序包括：第一透镜、第二透镜、第三透镜和第四透镜。第一透镜具有正光焦度或负光焦度，其物侧面可为凹面；第二透镜可具有正光焦度；第三透镜具有正光焦度或负光焦度；第四透镜具有正光焦度或负光焦度，其像侧面可为凹面。其中，第四透镜的边缘厚度ET4与第四透镜于光轴上的中心厚度CT4可满足0.3＜ET4/CT4＜0.9。
本申请采用了多片(例如，四片)透镜，通过合理分配各透镜的光焦度、面型、各透镜的中心厚度以及各透镜之间的轴上间距等，在加大通光量的过程中，使系统具有大光圈优势，从而在改善边缘光线像差的同时增强暗环境下的成像效果。同时，通过上述配置的成像镜头可具有超薄、小型化、大孔径、低敏感度、广角、高相对照度、高成像品质等至少一个有益效果。
附图说明
结合附图，通过以下非限制性实施方式的详细描述，本申请的其他特征、目的和优点将变得更加明显。在附图中：
图1示出了根据本申请实施例1的成像镜头的结构示意图；
图2A至图2C分别示出了实施例1的成像镜头的轴上色差曲线、象散曲线以及畸变曲线；
图3示出了根据本申请实施例2的成像镜头的结构示意图；
图4A至图4C分别示出了实施例2的成像镜头的轴上色差曲线、象散曲线以及畸变曲线；
图5示出了根据本申请实施例3的成像镜头的结构示意图；
图6A至图6C分别示出了实施例3的成像镜头的轴上色差曲线、象散曲线以及畸变曲线；
图7示出了根据本申请实施例4的成像镜头的结构示意图；
图8A至图8C分别示出了实施例4的成像镜头的轴上色差曲线、象散曲线以及畸变曲线；
图9示出了根据本申请实施例5的成像镜头的结构示意图；
图10A至图10C分别示出了实施例5的成像镜头的轴上色差曲 线、象散曲线以及畸变曲线；
图11示出了根据本申请实施例6的成像镜头的结构示意图；
图12A至图12C分别示出了实施例6的成像镜头的轴上色差曲线、象散曲线以及畸变曲线。
具体实施方式
为了更好地理解本申请，将参考附图对本申请的各个方面做出更详细的说明。应理解，这些详细说明只是对本申请的示例性实施方式的描述，而非以任何方式限制本申请的范围。在说明书全文中，相同的附图标号指代相同的元件。表述“和/或”包括相关联的所列项目中的一个或多个的任何和全部组合。
应注意，在本说明书中，第一、第二、第三等的表述仅用于将一个特征与另一个特征区分开来，而不表示对特征的任何限制。因此，在不背离本申请的教导的情况下，下文中讨论的第一透镜也可被称作第二透镜或第三透镜。
在附图中，为了便于说明，已稍微夸大了透镜的厚度、尺寸和形状。具体来讲，附图中所示的球面或非球面的形状通过示例的方式示出。即，球面或非球面的形状不限于附图中示出的球面或非球面的形状。附图仅为示例而并非严格按比例绘制。
在本文中，近轴区域是指光轴附近的区域。若透镜表面为凸面且未界定该凸面位置时，则表示该透镜表面至少于近轴区域为凸面；若透镜表面为凹面且未界定该凹面位置时，则表示该透镜表面至少于近轴区域为凹面。每个透镜中最靠近物体的表面称为物侧面，每个透镜中最靠近成像面的表面称为像侧面。
还应理解的是，用语“包括”、“包括有”、“具有”、“包含”和/或“包含有”，当在本说明书中使用时表示存在所陈述的特征、元件和/或部件，但不排除存在或附加有一个或多个其它特征、元件、部件和/或它们的组合。此外，当诸如“...中的至少一个”的表述出现在所列特征的列表之后时，修饰整个所列特征，而不是修饰列表中的单独元件。此外，当描述本申请的实施方式时，使用“可”表示“本申请的一个或多 个实施方式”。并且，用语“示例性的”旨在指代示例或举例说明。
除非另外限定，否则本文中使用的所有用语(包括技术用语和科学用语)均具有与本申请所属领域普通技术人员的通常理解相同的含义。还应理解的是，用语(例如在常用词典中定义的用语)应被解释为具有与它们在相关技术的上下文中的含义一致的含义，并且将不被以理想化或过度正式意义解释，除非本文中明确如此限定。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本申请。
以下对本申请的特征、原理和其他方面进行详细描述。
根据本申请示例性实施方式的成像镜头包括例如四片具有光焦度的透镜，即，第一透镜、第二透镜、第三透镜和第四透镜。该成像镜头还可进一步包括设置于成像面的感光元件。
第一透镜具有正光焦度或负光焦度，其物侧面可为凹面；第二透镜可具有正光焦度；第三透镜具有正光焦度或负光焦度；以及第四透镜具有正光焦度或负光焦度，像侧面可为凹面。
可选地，第一透镜的物侧面和像侧面中的至少一个具有至少一个反曲点。通过对第一透镜面型的合理控制，实现对镜头总尺寸的压缩，实现镜头的小型化。
可选地，第四透镜的物侧面可为凸面。将第四透镜的物侧面布置为凸面，有利于减小主光线角度并提高成像面上的相对照度。
在一些实施方式中，第一透镜可具有负光焦度。第一透镜和第二透镜的组合光焦度可为负光焦度，第一透镜和第二透镜的组合焦距f12与成像镜头的总有效焦距f之间可满足-8＜f12/f＜-3，更具体地，f12和f进一步可满足-7.56≤f12/f≤-3.05。合理分配f12和f，可提高镜头的解像力。
第三透镜的有效焦距f3与成像镜头的总有效焦距f之间可满足1.2＜|f3/f|＜2.3，更具体地，f3和f进一步可满足1.35≤|f3/f|≤2.19。通过对第三透镜正负光焦度范围的合理控制，有利于实现镜头的广角化。
第三透镜的有效焦距f3与第四透镜的有效焦距f4之间可满足f3/f4＞0，更具体地，f3和f4进一步可满足0＜f3/f4＜1，例如，0.24≤f3/f4≤0.66。可选地，第三透镜和第四透镜均可具有正光焦度。
第二透镜物侧面的曲率半径R3与第三透镜像侧面的曲率半径R6之间可满足-1.2＜R3/R6＜-0.5，更具体地，R3和R6进一步可满足-1.00≤R3/R6≤-0.71。合理控制第二透镜物侧面和第三透镜像侧面的曲率半径，可有效地降低系统的敏感度。满足条件式-1.2＜R3/R6＜-0.5，还有利于实现大光圈和高解像力。
第三透镜像侧面的曲率半径R6与成像镜头的总有效焦距f之间可满足-1.2＜R6/f＜-0.7，更具体地，R6和f进一步可满足-1.13≤R6/f≤-0.84。通过将R6和f的比值控制在合理范围内，可有效地提升镜头的解像力，提升像面的相对照度。
第三透镜像侧面的曲率半径R6与第三透镜的有效焦距f3之间可满足-1＜R6/f3＜-0.5，更具体地，R6和f3进一步可满足-0.64≤R6/f3≤-0.51。通过将R6和f3的比值控制在合理范围内，可有效地提升镜头的解像力，提升像面的相对照度。
第四透镜的边缘厚度ET4与第四透镜于光轴上的中心厚度CT4之间可满足0.3＜ET4/CT4＜0.9，更具体地，ET4和CT4进一步可满足0.31≤ET4/CT4≤0.82。通过将ET4和CT4的比值控制在合理范围内，可有效地减小主光线角度，提升像面的相对照度。
成像镜头的总有效焦距f与成像镜头的入瞳直径EPD之间可满足f/EPD＜2，更具体地，f和EPD进一步可满足f/EPD＜1.3，例如，1.18≤f/EPD≤1.19。光圈数Fno(即，镜头的总有效焦距f/镜头的入瞳直径EPD)的缩小，可有效地提升像面亮度，从而使镜头能够更好地满足光线不足时的拍摄需求。满足条件式f/EPD＜2，可在加大通光量的过程中，使镜头具有大光圈优势，从而在改善边缘光线像差的同时增强暗环境下的成像效果。
成像镜头的成像面上感光元件的有效像素区域对角线长的一半ImgH与成像镜头的总有效焦距f之间可满足ImgH/f＞1，更具体地，ImgH和f进一步可满足1.15≤ImgH/f≤1.30，以实现感光元件对较大 物侧空间的成像。
通过上述配置的成像镜头可具有较大的视场角，例如，最大半视场角HFOV可满足51.77°≤HFOV≤55.86°，体现了镜头的广角特性。
在示例性实施方式中，光学成像镜头还可设置有至少一光阑。光阑可根据需要设置于物侧与像侧之间的任意位置处，例如，光阑可设置于第二透镜与第三透镜之间，以提升镜头的成像质量。可选地，第二透镜的物侧面可为凸面，第三透镜的像侧面可为凸面。通过这样的设置，使得第二透镜和第三透镜以光阑为中心形成近似对称的结构，从而能够有效降低镜头敏感度。
可选地，光学成像镜头还可包括用于校正色彩偏差的滤光片和/或用于保护位于成像面上的感光元件的保护玻璃。
上文所述的成像镜头采用例如四片透镜，可有效避免由于透镜数目过多而造成的镜头体积过大和质量过重的问题，并有利于实现镜头的小型化和轻量化。通过合理分配各透镜的光焦度、面型、各透镜的中心厚度以及各透镜之间的轴上间距等，以在保证镜头小型化的同时降低镜头的敏感度并提高镜头的可加工性，从而使得该成像镜头更有利于生产加工并且可适用于便携式电子产品。另外，通过上述配置的成像镜头，还可具有例如超薄、大孔径、广角、高相对照度、高成像质量等有益效果。
在本申请的实施方式中，各透镜均可采用非球面透镜，以改善歪曲像差及改善象散像差，从而进一步提升成像质量。
然而，本领域的技术人员应当理解，在未背离本申请要求保护的技术方案的情况下，可改变构成光学成像镜头的透镜数量，来获得本说明书中描述的各个结果和优点。例如，虽然在实施方式中以四个透镜为例进行了描述，但是该成像镜头不限于包括四个透镜。如果需要，该成像镜头还可包括其它数量的透镜。
下面参照附图进一步描述可适用于上述实施方式的成像镜头的具体实施例。
实施例1
以下参照图1至图2C描述根据本申请实施例1的成像镜头。图1示出了根据本申请实施例1的成像镜头的结构示意图。
如图1所示，成像镜头沿着光轴从物侧至成像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4和成像面S11。成像镜头还可包括设置于成像面S11的感光元件。
第一透镜L1具有负光焦度，其物侧面S1为凹面，像侧面S2为凹面，且第一透镜L1的物侧面S1和像侧面S2均为非球面。
第二透镜L2具有正光焦度，其物侧面S3为凸面，像侧面S4为凹面，且第二透镜L2的物侧面S3和像侧面S4均为非球面。
第三透镜L3具有正光焦度，其物侧面S5为凸面，像侧面S6为凸面，且第三透镜L3的物侧面S5和像侧面S6均为非球面。
第四透镜L4具有正光焦度，其物侧面S7为凸面，像侧面S8为凹面，且第四透镜L4的物侧面S7和像侧面S8均为非球面。
可选地，成像镜头还可包括具有物侧面S9和像侧面S10的滤光片L5。来自物体的光依序穿过各表面S1至S10并最终成像在成像面S11上。
可选地，成像镜头还可包括设置于第二透镜L2与第三透镜L3之间的光阑STO，以提升成像镜头的成像质量。
表1示出了实施例1的成像镜头的各透镜的表面类型、曲率半径、厚度、材料及圆锥系数，其中，曲率半径和厚度的单位均为毫米(mm)。
Figure PCTCN2018077205-appb-000001
Figure PCTCN2018077205-appb-000002
表1
第二透镜L2物侧面S3的曲率半径R3与第三透镜像侧面S6的曲率半径R6之间满足R3/R6＝-0.80。
在本实施例中，各透镜均可采用非球面透镜，各非球面面型x由以下公式限定：
Figure PCTCN2018077205-appb-000003
其中，x为非球面沿光轴方向在高度为h的位置时，距非球面顶点的距离矢高；c为非球面的近轴曲率，c＝1/R(即，近轴曲率c为上表1中曲率半径R的倒数)；k为圆锥系数(在表1中已给出)；Ai是非球面第i-th阶的修正系数。下表2给出了可用于实施例1中各非球面镜面S1-S8的高次项系数A 4、A 6、A 8、A 10、A 12、A 14和A 16。
面号 A4 A6 A8 A10 A12 A14 A16
S1 4.6565E-02 -1.2346E-02 2.6572E-03 -3.6600E-04 2.9845E-05 -1.2020E-06 1.6047E-08
S2 -1.6600E-02 -9.9701E-04 -1.0623E-03 1.0405E-04 -1.1247E-05 2.8602E-06 -2.2894E-08
S3 -4.0374E-02 -6.4001E-03 -1.0090E-03 5.7484E-04 -1.0708E-04 8.5116E-06 -2.7237E-07
S4 3.1995E-02 -2.7903E-02 2.1654E-02 -1.5988E-02 1.0724E-02 -3.3603E-03 4.1412E-04
S5 -3.8059E-03 -4.0681E-03 8.9439E-04 -1.1164E-05 -4.5239E-05 9.2240E-06 -7.2005E-07
S6 -3.2191E-04 -4.1794E-03 3.9007E-03 -1.5447E-03 3.3799E-04 -3.9375E-05 1.9906E-06
S7 1.7018E-04 -6.8679E-04 -1.0677E-03 3.7318E-04 -7.6404E-05 7.0128E-06 -2.7388E-07
S8 2.3619E-02 -8.0231E-03 1.2472E-03 -2.9155E-04 3.7951E-05 -2.3942E-06 5.6877E-08
表2
下表3给出实施例1的成像镜头的总有效焦距f、各透镜的有效焦距f1至f4、成像镜头成像面S11上感光元件的有效像素区域对角线长的一半ImgH、成像镜头的最大半视场角HFOV以及成像镜头的光圈数Fno(即，f/EPD)。
Figure PCTCN2018077205-appb-000004
表3
第三透镜L3的有效焦距f3与第四透镜L4的有效焦距f4之间满足f3/f4＝0.30；第三透镜L3的有效焦距f3与成像镜头的总有效焦距f之间满足|f3/f|＝1.49；成像镜头的成像面S11上感光元件的有效像素区域对角线长的一半ImgH与成像镜头的总有效焦距f之间满足ImgH/f＝1.18；第三透镜像侧面S6的曲率半径R6与成像镜头的总有效焦距f之间满足R6/f＝-0.95；第三透镜像侧面S6的曲率半径R6与第三透镜L3的有效焦距f3之间满足R6/f3＝-0.64。
成像镜头的总有效焦距f与成像镜头的入瞳直径EPD之间满足f/EPD＝1.18；第一透镜L1和第二透镜L2的组合焦距f12与成像镜头的总有效焦距f之间满足f12/f＝-3.43。
图2A示出了实施例1的成像镜头的轴上色差曲线，其表示不同波长的光线经由镜头后的会聚焦点偏离。图2B示出了实施例1的成像镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图2C示出了实施例1的成像镜头的畸变曲线，其表示不同视角情况下的畸变大小值。根据图2A至图2C可知，实施例1所给出的成像镜头能够实现良好的成像品质。
实施例2
以下参照图3至图4C描述根据本申请实施例2的成像镜头。在本实施例及以下实施例中，为简洁起见，将省略部分与实施例1相似的描述。图3示出了根据本申请实施例2的成像镜头的结构示意图。
如图3所示，成像镜头沿着光轴从物侧至成像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4和成像面S11。成像镜头还可包括设置于成像面S11的感光元件。
第一透镜L1具有负光焦度，其物侧面S1为凹面，像侧面S2为凹面，且第一透镜L1的物侧面S1和像侧面S2均为非球面。
第二透镜L2具有正光焦度，其物侧面S3为凸面，像侧面S4为凹面，且第二透镜L2的物侧面S3和像侧面S4均为非球面。
第三透镜L3具有正光焦度，其物侧面S5为凸面，像侧面S6为凸面，且第三透镜L3的物侧面S5和像侧面S6均为非球面。
第四透镜L4具有正光焦度，其物侧面S7为凸面，像侧面S8为凹面，且第四透镜L4的物侧面S7和像侧面S8均为非球面。
可选地，成像镜头还可包括具有物侧面S9和像侧面S10的滤光片L5。来自物体的光依序穿过各表面S1至S10并最终成像在成像面S11上。
可选地，成像镜头还可包括设置于第二透镜L2与第三透镜L3之间的光阑STO，以提升成像镜头的成像质量。
表4示出了实施例2的成像镜头的各透镜的表面类型、曲率半径、厚度、材料及圆锥系数，其中，曲率半径和厚度的单位均为毫米(mm)。表5示出了可用于实施例2中各非球面镜面的高次项系数，其中，各非球面面型可由上述实施例1中给出的公式(1)限定。表6示出了实施例2中成像镜头的总有效焦距f、各透镜的有效焦距f1至f4、成像镜头成像面S11上感光元件的有效像素区域对角线长的一半ImgH、成像镜头的最大半视场角HFOV以及成像镜头的光圈数Fno。
Figure PCTCN2018077205-appb-000005
表4
Figure PCTCN2018077205-appb-000006
Figure PCTCN2018077205-appb-000007
表5
Figure PCTCN2018077205-appb-000008
表6
图4A示出了实施例2的成像镜头的轴上色差曲线，其表示不同波长的光线经由镜头后的会聚焦点偏离。图4B示出了实施例2的成像镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图4C示出了实施例2的成像镜头的畸变曲线，其表示不同视角情况下的畸变大小值。根据图4A至图4C可知，实施例2所给出的成像镜头能够实现良好的成像品质。
实施例3
以下参照图5至图6C描述根据本申请实施例3的成像镜头。图5示出了根据本申请实施例3的成像镜头的结构示意图。
如图5所示，成像镜头沿着光轴从物侧至成像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4和成像面S11。成像镜头还可包括设置于成像面S11的感光元件。
第一透镜L1具有负光焦度，其物侧面S1为凹面，像侧面S2为凸面，且第一透镜L1的物侧面S1和像侧面S2均为非球面。
第二透镜L2具有正光焦度，其物侧面S3为凸面，像侧面S4为凹面，且第二透镜L2的物侧面S3和像侧面S4均为非球面。
第三透镜L3具有正光焦度，其物侧面S5为凸面，像侧面S6为凸面，且第三透镜L3的物侧面S5和像侧面S6均为非球面。
第四透镜L4具有正光焦度，其物侧面S7为凸面，像侧面S8为凹面，且第四透镜L4的物侧面S7和像侧面S8均为非球面。
可选地，成像镜头还可包括具有物侧面S9和像侧面S10的滤光 片L5。来自物体的光依序穿过各表面S1至S10并最终成像在成像面S11上。
可选地，成像镜头还可包括设置于第二透镜L2与第三透镜L3之间的光阑STO，以提升成像镜头的成像质量。
表7示出了实施例3的成像镜头的各透镜的表面类型、曲率半径、厚度、材料及圆锥系数，其中，曲率半径和厚度的单位均为毫米(mm)。表8示出了可用于实施例3中各非球面镜面的高次项系数，其中，各非球面面型可由上述实施例1中给出的公式(1)限定。表9示出了实施例3中成像镜头的总有效焦距f、各透镜的有效焦距f1至f4、成像镜头成像面S11上感光元件的有效像素区域对角线长的一半ImgH、成像镜头的最大半视场角HFOV以及成像镜头的光圈数Fno。
Figure PCTCN2018077205-appb-000009
表7
面号 A4 A6 A8 A10 A12 A14 A16
S1 3.4041E-02 -8.0765E-03 1.4062E-03 -1.5606E-04 1.0588E-05 -3.9081E-07 5.9438E-09
S2 7.3896E-02 -2.8880E-02 6.8030E-03 -8.6467E-04 3.3052E-05 3.3156E-06 -2.6446E-07
S3 -6.5245E-02 7.1411E-02 -6.3672E-02 2.9487E-02 -7.5443E-03 1.0446E-03 -6.3054E-05
S4 2.3701E-02 2.6330E-02 2.4014E-02 -1.1509E-01 1.4037E-01 -7.4699E-02 1.6435E-02
S5 -1.8155E-03 -2.2910E-03 9.2594E-04 -2.4352E-04 -3.1695E-05 3.6825E-05 -4.7794E-06
S6 -1.0641E-02 -4.9720E-03 1.5785E-02 -1.1506E-02 4.0812E-03 -7.3324E-04 5.3484E-05
S7 2.0738E-02 -1.3888E-02 8.7375E-03 -3.1144E-03 5.5258E-04 -4.8435E-05 1.6643E-06
S8 3.2409E-02 -3.4198E-02 2.1306E-02 -7.3169E-03 1.3322E-03 -1.2372E-04 4.6292E-06
表8
Figure PCTCN2018077205-appb-000010
表9
图6A示出了实施例3的成像镜头的轴上色差曲线，其表示不同波长的光线经由镜头后的会聚焦点偏离。图6B示出了实施例3的成像镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图6C示出了实施例3的成像镜头的畸变曲线，其表示不同视角情况下的畸变大小值。根据图6A至图6C可知，实施例3所给出的成像镜头能够实现良好的成像品质。
实施例4
以下参照图7至图8C描述根据本申请实施例4的成像镜头。图7示出了根据本申请实施例4的成像镜头的结构示意图。
如图7所示，成像镜头沿着光轴从物侧至成像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4和成像面S11。成像镜头还可包括设置于成像面S11的感光元件。
第一透镜L1具有负光焦度，其物侧面S1为凹面，像侧面S2为凸面，且第一透镜L1的物侧面S1和像侧面S2均为非球面。
第二透镜L2具有正光焦度，其物侧面S3为凸面，像侧面S4为凹面，且第二透镜L2的物侧面S3和像侧面S4均为非球面。
第三透镜L3具有正光焦度，其物侧面S5为凸面，像侧面S6为凸面，且第三透镜L3的物侧面S5和像侧面S6均为非球面。
第四透镜L4具有正光焦度，其物侧面S7为凸面，像侧面S8为凹面，且第四透镜L4的物侧面S7和像侧面S8均为非球面。
可选地，成像镜头还可包括具有物侧面S9和像侧面S10的滤光片L5。来自物体的光依序穿过各表面S1至S10并最终成像在成像面S11上。
可选地，成像镜头还可包括设置于第二透镜L2与第三透镜L3之间的光阑STO，以提升成像镜头的成像质量。
表10示出了实施例4的成像镜头的各透镜的表面类型、曲率半径、厚度、材料及圆锥系数，其中，曲率半径和厚度的单位均为毫米(mm)。表11示出了可用于实施例4中各非球面镜面的高次项系数，其中，各非球面面型可由上述实施例1中给出的公式(1)限定。表12示出了实施例4中成像镜头的总有效焦距f、各透镜的有效焦距f1至f4、成像镜头成像面S11上感光元件的有效像素区域对角线长的一半ImgH、成像镜头的最大半视场角HFOV以及成像镜头的光圈数Fno。
Figure PCTCN2018077205-appb-000011
表10
面号 A4 A6 A8 A10 A12 A14 A16
S1 2.8739E-02 -6.1233E-03 9.6121E-04 -9.6462E-05 5.9186E-06 -1.9757E-07 2.7192E-09
S2 6.3029E-02 -2.2036E-02 4.6203E-03 -5.1530E-04 1.4796E-05 1.9973E-06 -1.3160E-07
S3 -5.6471E-02 5.5893E-02 -4.5245E-02 1.9012E-02 -4.4110E-03 5.5396E-04 -3.0330E-05
S4 2.1847E-02 2.0877E-02 1.7126E-02 -7.3726E-02 8.2071E-02 -3.9615E-02 7.9054E-03
S5 -1.5473E-03 -1.7787E-03 6.6067E-04 -1.5738E-04 -1.8532E-05 1.9529E-05 -2.2990E-06
S6 -9.2307E-03 -3.8929E-03 1.1223E-02 -7.4150E-03 2.3862E-03 -3.8885E-04 2.5727E-05
S7 1.7890E-02 -1.0394E-02 5.9957E-03 -2.0056E-03 3.3013E-04 -2.6469E-05 8.2318E-07
S8 2.7708E-02 -2.5173E-02 1.4634E-02 -4.8433E-03 8.4749E-04 -7.5141E-05 2.6717E-06
表11
Figure PCTCN2018077205-appb-000012
表12
图8A示出了实施例4的成像镜头的轴上色差曲线，其表示不同波长的光线经由镜头后的会聚焦点偏离。图8B示出了实施例4的成像镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图8C示出了实施例4的成像镜头的畸变曲线，其表示不同视角情况下的畸变大小值。根据图8A至图8C可知，实施例4所给出的成像镜头能够实现良好的成像品质。
实施例5
以下参照图9至图10C描述根据本申请实施例5的成像镜头。图9示出了根据本申请实施例5的成像镜头的结构示意图。
如图9所示，成像镜头沿着光轴从物侧至成像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4和成像面S11。成像镜头还可包括设置于成像面S11的感光元件。
第一透镜L1具有负光焦度，其物侧面S1为凹面，像侧面S2为凸面，且第一透镜L1的物侧面S1和像侧面S2均为非球面。
第二透镜L2具有正光焦度，其物侧面S3为凸面，像侧面S4为凹面，且第二透镜L2的物侧面S3和像侧面S4均为非球面。
第三透镜L3具有正光焦度，其物侧面S5为凸面，像侧面S6为凸面，且第三透镜L3的物侧面S5和像侧面S6均为非球面。
第四透镜L4具有正光焦度，其物侧面S7为凸面，像侧面S8为凹面，且第四透镜L4的物侧面S7和像侧面S8均为非球面。
可选地，成像镜头还可包括具有物侧面S9和像侧面S10的滤光片L5。来自物体的光依序穿过各表面S1至S10并最终成像在成像面S11上。
可选地，成像镜头还可包括设置于第二透镜L2与第三透镜L3之间的光阑STO，以提升成像镜头的成像质量。
表13示出了实施例5的成像镜头的各透镜的表面类型、曲率半径、厚度、材料及圆锥系数，其中，曲率半径和厚度的单位均为毫米(mm)。表14示出了可用于实施例5中各非球面镜面的高次项系数，其中，各非球面面型可由上述实施例1中给出的公式(1)限定。表15示出了 实施例5中成像镜头的总有效焦距f、各透镜的有效焦距f1至f4、成像镜头成像面S11上感光元件的有效像素区域对角线长的一半ImgH、成像镜头的最大半视场角HFOV以及成像镜头的光圈数Fno。
Figure PCTCN2018077205-appb-000013
表13
面号 A4 A6 A8 A10 A12 A14 A16
S1 2.7718E-02 -5.7673E-03 8.7383E-04 -8.4358E-05 4.9687E-06 -1.5908E-07 2.0995E-09
S2 6.6613E-02 -2.3884E-02 5.1463E-03 -5.9107E-04 1.7962E-05 2.3107E-06 -1.5741E-07
S3 -5.7427E-02 5.5743E-02 -4.5264E-02 1.9010E-02 -4.4110E-03 5.5396E-04 -3.0330E-05
S4 2.5305E-02 2.3294E-02 1.8381E-02 -7.2852E-02 8.2071E-02 -3.9615E-02 7.9054E-03
S5 -1.5040E-03 -1.7641E-03 6.6516E-04 -1.5659E-04 -1.8532E-05 1.9529E-05 -2.2990E-06
S6 -9.4060E-03 -3.9030E-03 1.1226E-02 -7.4140E-03 2.3862E-03 -3.8885E-04 2.5727E-05
S7 1.7037E-02 -1.0356E-02 6.4613E-03 -2.2809E-03 4.0137E-04 -3.5300E-05 1.2480E-06
S8 2.2279E-02 -1.8947E-02 1.1330E-02 -3.8602E-03 6.8129E-04 -6.0241E-05 2.1222E-06
表14
Figure PCTCN2018077205-appb-000014
表15
图10A示出了实施例5的成像镜头的轴上色差曲线，其表示不同波长的光线经由镜头后的会聚焦点偏离。图10B示出了实施例5的成像镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图10C示出了实施例5的成像镜头的畸变曲线，其表示不同视角情况下的畸变 大小值。根据图10A至图10C可知，实施例5所给出的成像镜头能够实现良好的成像品质。
实施例6
以下参照图11至图12C描述根据本申请实施例6的成像镜头。图11示出了根据本申请实施例6的成像镜头的结构示意图。
如图9所示，成像镜头沿着光轴从物侧至成像侧依序包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4和成像面S11。成像镜头还可包括设置于成像面S11的感光元件。
第一透镜L1具有负光焦度，其物侧面S1为凹面，像侧面S2为凹面，且第一透镜L1的物侧面S1和像侧面S2均为非球面。
第二透镜L2具有正光焦度，其物侧面S3为凸面，像侧面S4为凹面，且第二透镜L2的物侧面S3和像侧面S4均为非球面。
第三透镜L3具有正光焦度，其物侧面S5为凹面，像侧面S6为凸面，且第三透镜L3的物侧面S5和像侧面S6均为非球面。
第四透镜L4具有正光焦度，其物侧面S7为凸面，像侧面S8为凹面，且第四透镜L4的物侧面S7和像侧面S8均为非球面。
可选地，成像镜头还可包括具有物侧面S9和像侧面S10的滤光片L5。来自物体的光依序穿过各表面S1至S10并最终成像在成像面S11上。
可选地，成像镜头还可包括设置于第二透镜L2与第三透镜L3之间的光阑STO，以提升成像镜头的成像质量。
表16示出了实施例6的成像镜头的各透镜的表面类型、曲率半径、厚度、材料及圆锥系数，其中，曲率半径和厚度的单位均为毫米(mm)。表17示出了可用于实施例6中各非球面镜面的高次项系数，其中，各非球面面型可由上述实施例1中给出的公式(1)限定。表18示出了实施例6中成像镜头的总有效焦距f、各透镜的有效焦距f1至f4、成像镜头成像面S11上感光元件的有效像素区域对角线长的一半ImgH、成像镜头的最大半视场角HFOV以及成像镜头的光圈数Fno。
Figure PCTCN2018077205-appb-000015
表16
面号 A4 A6 A8 A10 A12 A14 A16
S1 1.9718E-03 -5.9872E-05 1.3738E-06 -2.0188E-08 1.8318E-10 -9.0868E-13 1.8610E-15
S2 8.9741E-04 2.0456E-04 -2.8671E-05 1.9978E-06 -9.1792E-08 2.3424E-09 -2.4562E-11
S3 -4.5583E-03 -7.3360E-04 -1.0113E-04 1.1166E-05 6.3833E-07 1.3451E-08 -6.2109E-09
S4 3.8413E-03 -6.1074E-04 2.3076E-04 -2.4060E-05 5.1255E-06 1.5991E-06 8.4883E-09
S5 -2.1058E-02 -3.6099E-03 -1.8812E-03 2.0402E-04 2.5480E-04 -3.0362E-04 7.9197E-10
S6 8.2651E-04 -1.2477E-03 1.5462E-04 4.9745E-05 -1.7945E-05 -3.1353E-06 4.9624E-07
S7 4.2604E-03 -4.3025E-04 2.0930E-05 -4.1380E-06 3.0571E-07 -3.2174E-08 4.2209E-09
S8 -9.0579E-04 -4.3014E-04 -2.5524E-05 -2.2732E-06 4.3794E-07 3.2149E-08 -2.1241E-09
表17
Figure PCTCN2018077205-appb-000016
表18
图12A示出了实施例6的成像镜头的轴上色差曲线，其表示不同波长的光线经由镜头后的会聚焦点偏离。图12B示出了实施例6的成像镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图12C示出了实施例6的成像镜头的畸变曲线，其表示不同视角情况下的畸变大小值。根据图12A至图12C可知，实施例6所给出的成像镜头能够实现良好的成像品质。
综上，实施例1至实施例6分别满足以下表19所示的关系。
条件式\实施例 1 2 3 4 5 6
f/EPD 1.18 1.18 1.18 1.18 1.19 1.18
f3/f4 0.30 0.66 0.24 0.24 0.24 0.51
ImgH/f 1.18 1.17 1.17 1.15 1.17 1.30
f12/f -3.43 -3.56 -3.67 -3.55 -3.05 -7.56
|f3/f| 1.49 1.35 1.40 1.42 1.46 2.19
R3/R6 -0.80 -0.73 -0.73 -0.73 -0.71 -1.00
R6/f -0.95 -0.84 -0.88 -0.91 -0.93 -1.13
R6/f3 -0.64 -0.62 -0.63 -0.64 -0.64 -0.51
ET4/CT4 0.64 0.82 0.61 0.65 0.64 0.31
表19
本申请还提供一种成像装置，其电子感光元件可以是感光耦合元件(CCD)或互补性氧化金属半导体元件(CMOS)。成像装置可以是诸如数码相机的独立成像设备，也可以是集成在诸如手机等移动电子设备上的成像模块。该成像装置装配有以上描述的成像镜头。
以上描述仅为本申请的较佳实施例以及对所运用技术原理的说明。本领域技术人员应当理解，本申请中所涉及的发明范围，并不限于上述技术特征的特定组合而成的技术方案，同时也应涵盖在不脱离所述发明构思的情况下，由上述技术特征或其等同特征进行任意组合而形成的其它技术方案。例如上述特征与本申请中公开的(但不限于)具有类似功能的技术特征进行互相替换而形成的技术方案。

Claims (27)

  1. 成像镜头，沿光轴由物侧至像侧依序包括：第一透镜、第二透镜、第三透镜和第四透镜，
    其特征在于，
    所述第一透镜的物侧面为凹面，所述第四透镜的像侧面为凹面；
    所述第二透镜具有正光焦度；
    所述第一透镜、所述第三透镜和所述第四透镜中的至少一个具有负光焦度；
    所述第三透镜的有效焦距f3与所述第四透镜的有效焦距f4满足f3/f4＞0。
  2. 根据权利要求1所述的成像镜头，其特征在于，所述第三透镜的有效焦距f3与所述第四透镜的有效焦距f4满足0＜f3/f4＜1。
  3. 根据权利要求1所述的成像镜头，其特征在于，所述成像镜头的总有效焦距f与所述成像镜头的入瞳直径EPD满足f/EPD＜2。
  4. 根据权利要求1所述的成像镜头，其特征在于，所述成像镜头成像面上有效像素区域对角线长的一半ImgH与所述成像镜头的总有效焦距f满足ImgH/f＞1。
  5. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第三透镜的有效焦距f3与所述成像镜头的总有效焦距f满足1.2＜|f3/f|＜2.3。
  6. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第一透镜具有负光焦度。
  7. 根据权利要求6所述的成像镜头，其特征在于，所述第一透镜 和所述第二透镜的组合光焦度为负光焦度，其组合焦距f12与所述成像镜头的总有效焦距f满足-8＜f12/f＜-3。
  8. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第二透镜物侧面的曲率半径R3与所述第三透镜像侧面的曲率半径R6满足-1.2＜R3/R6＜-0.5。
  9. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第四透镜的物侧面为凸面。
  10. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第一透镜的物侧面和像侧面中的至少一个具有至少一个反曲点。
  11. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第三透镜像侧面的曲率半径R6与所述成像镜头的总有效焦距f满足-1.2＜R6/f＜-0.7。
  12. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第三透镜像侧面的曲率半径R6与所述第三透镜的有效焦距f3满足-1＜R6/f3＜-0.5。
  13. 根据权利要求1至4中任一项所述的成像镜头，其特征在于，所述第四透镜的边缘厚度ET4与所述第四透镜于所述光轴上的中心厚度CT4满足0.3＜ET4/CT4＜0.9。
  14. 成像镜头，沿光轴由物侧至像侧依序包括：第一透镜、第二透镜、第三透镜和第四透镜，其特征在于，
    所述第一透镜具有正光焦度或负光焦度，其物侧面为凹面；
    所述第二透镜具有正光焦度；
    所述第三透镜具有正光焦度或负光焦度；
    所述第四透镜具有正光焦度或负光焦度，其像侧面为凹面；以及
    所述第一透镜和所述第二透镜的组合光焦度为负光焦度，其组合焦距f12与所述成像镜头的总有效焦距f满足-8＜f12/f＜-3。
  15. 根据权利要求14所述的成像镜头，其特征在于，所述第三透镜的有效焦距f3与所述成像镜头的总有效焦距f满足1.2＜|f3/f|＜2.3。
  16. 根据权利要求15所述的成像镜头，其特征在于，所述第三透镜的有效焦距f3与所述第四透镜的有效焦距f4满足f3/f4＞0。
  17. 根据权利要求16所述的成像镜头，其特征在于，所述第三透镜和所述第四透镜均具有正光焦度。
  18. 根据权利要求17所述的成像镜头，其特征在于，所述第三透镜的有效焦距f3与所述第四透镜的有效焦距f4满足0＜f3/f4＜1。
  19. 根据权利要求14所述的成像镜头，其特征在于，所述第二透镜物侧面的曲率半径R3与所述第三透镜像侧面的曲率半径R6满足-1.2＜R3/R6＜-0.5。
  20. 根据权利要求14所述的成像镜头，其特征在于，所述第一透镜的物侧面和像侧面中的至少一个具有至少一个反曲点。
  21. 根据权利要求19所述的成像镜头，其特征在于，所述第二透镜的物侧面为凸面，所述第三透镜的像侧面为凸面。
  22. 根据权利要求14所述的成像镜头，其特征在于，所述第四透镜的物侧面为凸面。
  23. 根据权利要求21所述的成像镜头，其特征在于，所述第三透 镜像侧面的曲率半径R6与所述成像镜头的总有效焦距f满足-1.2＜R6/f＜-0.7。
  24. 根据权利要求17所述的成像镜头，其特征在于，所述第三透镜像侧面的曲率半径R6与所述第三透镜的有效焦距f3满足-1＜R6/f3＜-0.5。
  25. 根据权利要求14所述的成像镜头，其特征在于，所述第四透镜的边缘厚度ET4与所述第四透镜于所述光轴上的中心厚度CT4满足0.3＜ET4/CT4＜0.9。
  26. 根据权利要求14至25中任一项所述的成像镜头，其特征在于，所述成像镜头成像面上有效像素区域对角线长的一半ImgH与所述成像镜头的总有效焦距f满足ImgH/f＞1。
  27. 根据权利要求14至25中任一项所述的成像镜头，其特征在于，所述成像镜头的总有效焦距f与所述成像镜头的入瞳直径EPD满足f/EPD＜2。
PCT/CN2018/077205 2017-07-25 2018-02-26 成像镜头 Ceased WO2019019626A1 (zh)

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