WO2019037420A1 - 摄像透镜组 - Google Patents

摄像透镜组 Download PDF

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Publication number
WO2019037420A1
WO2019037420A1 PCT/CN2018/080106 CN2018080106W WO2019037420A1 WO 2019037420 A1 WO2019037420 A1 WO 2019037420A1 CN 2018080106 W CN2018080106 W CN 2018080106W WO 2019037420 A1 WO2019037420 A1 WO 2019037420A1
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WIPO (PCT)
Prior art keywords
lens
image pickup
image
optical axis
unit according
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PCT/CN2018/080106
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English (en)
French (fr)
Inventor
王新权
Original Assignee
浙江舜宇光学有限公司
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Priority claimed from CN201721066452.5U external-priority patent/CN207473174U/zh
Priority claimed from CN201710735300.8A external-priority patent/CN107315236B/zh
Application filed by 浙江舜宇光学有限公司 filed Critical 浙江舜宇光学有限公司
Priority to US16/231,092 priority Critical patent/US11137571B2/en
Publication of WO2019037420A1 publication Critical patent/WO2019037420A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • 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
    • G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light

Definitions

  • the present application relates to an image pickup lens group, and more particularly, to a large aperture, high brightness imaging lens group including four lenses.
  • the aperture number Fno (the total effective focal length of the lens/the entrance pupil diameter of the lens) of the conventional imaging lens unit is generally 2.0 or more, so as to achieve good optical performance while achieving miniaturization.
  • higher requirements have been placed on the matching camera lens group, especially in the case of insufficient light (such as rainy days, dusk, etc.), hand shake, etc.
  • An imaging lens group having a number Fno of 2.0 or more has been unable to satisfy higher-order imaging requirements.
  • the image pickup lens group also needs to have a large aperture and a high brightness while ensuring a small size, so as to ensure a better application of the infrared lens in the fields of detection, recognition, and the like.
  • the present application provides an imaging lens set that is applicable to a portable electronic product that can at least solve or partially address at least one of the above disadvantages of the prior art.
  • the present application provides an image pickup lens group including, 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 sides of the first lens and the second lens may both be convex; the image side of the third lens may be convex; the image side of the fourth lens may be concave; the first lens and the third lens may both have positive power; Both the second lens and the fourth lens have a positive power or a negative power; the total effective focal length f of the image pickup lens group and the entrance pupil diameter EPD of the image pickup lens group can satisfy f/EPD ⁇ 1.5.
  • the image side surface of the second lens may be a concave surface, and the radius of curvature R3 of the second lens object side surface and the second lens image side surface curvature radius R4 may satisfy 0.5 ⁇ R3/R4 ⁇ 1.
  • the second lens may have positive refractive power, and its effective focal length f2 and the total effective focal length f of the imaging lens group may satisfy 2 ⁇ f2/f ⁇ 8.
  • the radius of curvature R1 of the side surface of the first lens object and the total effective focal length f of the image pickup lens group may satisfy 0.5 ⁇ R1/f ⁇ 1.2.
  • the distance TTL between the first lens and the second lens on the optical axis and the on-axis distance TTL from the object side of the first lens to the image plane of the imaging lens may satisfy T12/TTL ⁇ 0.2.
  • the center thickness CT1 of the first lens on the optical axis and the center thickness CT3 of the third lens on the optical axis may satisfy 0.6 ⁇ CT1/CT3 ⁇ 1.3.
  • the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis may satisfy 0.4 ⁇ CT1/(CT2+). CT3) ⁇ 0.9.
  • the sum of the central thicknesses of the first lens, the second lens, the third lens, and the fourth lens on the optical axis, respectively, ⁇ CT and the axial distance from the object side of the first lens to the image plane of the imaging lens TTL can satisfy ⁇ CT/TTL ⁇ 0.6.
  • At least one of the object side and the image side of the fourth lens may have at least one inflection point.
  • the effective half aperture DT42 of the side of the fourth lens image and the half ImgH of the diagonal length of the effective pixel area on the image plane of the imaging lens satisfy 0.7 ⁇ DT42/ImgH ⁇ 1.
  • the effective half aperture DT11 of the side of the first lens object and the half ImgH of the diagonal length of the effective pixel area on the image plane of the imaging lens may satisfy 0.5 ⁇ DT11 / ImgH ⁇ 1.
  • the distance between the intersection of the side of the second lens object and the optical axis to the apex of the effective half-diameter of the second lens object on the optical axis SAG21 and the center thickness CT2 of the second lens on the optical axis can satisfy 0 ⁇ SAG21 /CT2 ⁇ 0.7.
  • the imaging lens group may further include an infrared band pass filter disposed between the fourth lens and the imaging surface.
  • the present application also provides an imaging lens group including, 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 surface of the first lens may be a convex surface; at least one of the object side surface and the image side surface of the third lens may be a convex surface; at least one of the object side surface and the image side surface of the fourth lens may be a concave surface;
  • the first lens, the third surface At least two of the lens and the fourth lens may have a positive power;
  • the second lens may have a positive power, and an effective focal length f2 thereof and a total effective focal length f of the image pickup lens group may satisfy 2 ⁇ f2/f ⁇ 8.
  • both the first lens and the third lens may have positive power.
  • the image side of the fourth lens may be concave.
  • the object side of the second lens may be convex, and the image side may be concave.
  • the present application also provides an imaging lens group including, 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 sides of the first lens and the second lens may both be convex; the image side of the third lens may be convex; the image side of the fourth lens may be concave; the first lens and the third lens may both have positive power; Both the second lens and the fourth lens have positive or negative power.
  • the effective half-diameter DT11 of the side surface of the first lens object and the half ImgH of the diagonal length of the effective pixel area on the image plane of the imaging lens satisfy 0.5 ⁇ DT11/ImgH ⁇ 1.
  • the present application also provides an imaging lens group including, 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 sides of the first lens and the second lens may both be convex; the image side of the third lens may be convex; the image side of the fourth lens may be concave; the first lens and the third lens may both have positive power; Both the second lens and the fourth lens have positive or negative power.
  • the radius of curvature R3 of the side surface of the second lens object and the radius of curvature R4 of the side surface of the second lens image may satisfy 0.5 ⁇ R3/R4 ⁇ 1.
  • the present application also provides an imaging lens group including, 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 sides of the first lens and the second lens may both be convex; the image side of the third lens may be convex; the image side of the fourth lens may be concave; the first lens and the third lens may both have positive power; Both the second lens and the fourth lens have positive or negative power.
  • the effective half diameter DT42 of the side surface of the fourth lens image and the half ImgH of the diagonal length of the effective pixel area on the image plane of the imaging lens satisfy 0.7 ⁇ DT42/ImgH ⁇ 1.
  • the present application also provides an imaging lens group including, 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 sides of the first lens and the second lens may both be convex; the image side of the third lens may be convex; the image side of the fourth lens may be concave; the first lens and the third lens may both have positive power; Both the second lens and the fourth lens have positive or negative power.
  • the distance between the intersection of the side surface of the second lens object and the optical axis to the apex of the effective half-diameter of the second lens object on the optical axis SAG21 and the center thickness CT2 of the second lens on the optical axis can satisfy 0 ⁇ SAG21/CT2 ⁇ 0.7 .
  • the present application also provides an imaging lens group including, 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 sides of the first lens and the second lens may both be convex; the image side of the third lens may be convex; the image side of the fourth lens may be concave; the first lens and the third lens may both have positive power; Both the second lens and the fourth lens have positive or negative power.
  • the imaging lens group may further include an infrared band pass filter disposed between the fourth lens and the imaging surface.
  • the lens group has a good image quality while achieving good image quality by rationally distributing the power of each lens, the surface shape, the center thickness of each lens, and the on-axis spacing between the lenses. At least one beneficial effect of ultra-thin, miniaturization, low sensitivity, large aperture, high brightness, and the like.
  • FIG. 1 is a schematic structural view of an image pickup lens group according to Embodiment 1 of the present application.
  • 2A to 2E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the image pickup lens group of Embodiment 1;
  • FIG. 3 is a schematic structural view of an image pickup lens group according to Embodiment 2 of the present application.
  • 4A to 4E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the imaging lens group of Embodiment 2.
  • FIG. 5 is a schematic structural view of an image pickup lens group according to Embodiment 3 of the present application.
  • 6A to 6E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the imaging lens group of Embodiment 3.
  • FIG. 7 is a schematic structural view of an image pickup lens group according to Embodiment 4 of the present application.
  • 8A to 8E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the imaging lens group of Embodiment 4.
  • FIG. 9 is a schematic structural view of an image pickup lens group according to Embodiment 5 of the present application.
  • 10A to 10E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the imaging lens group of Embodiment 5.
  • FIG. 11 is a schematic structural view of an image pickup lens group according to Embodiment 6 of the present application.
  • 12A to 12E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the image pickup lens unit of Embodiment 6;
  • FIG. 13 is a schematic structural view of an image pickup lens group according to Embodiment 7 of the present application.
  • 14A to 14E respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a phase contrast curve of the imaging lens group of Embodiment 7.
  • 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 group includes, for example, four lenses having powers, that is, a first lens, a second lens, a third lens, and a fourth lens.
  • the four lenses are sequentially arranged from the object side to the image side along the optical axis.
  • the image pickup lens group may further include a photosensitive member disposed on the image forming surface, and half of the diagonal length of the effective pixel region of the photosensitive member is 1 mgH.
  • the first lens may have positive refractive power, which has a large refractive power, which is advantageous for shortening the overall length of the lens group and reducing the lens group volume.
  • the object side surface of the first lens may be a convex surface, and the radius of curvature R1 of the object side surface and the total effective focal length f of the image pickup lens group may satisfy 0.5 ⁇ R1/f ⁇ 1.2, and more specifically, R1 and f may further satisfy 0.58 ⁇ . R1/f ⁇ 0.74. Satisfying the conditional formula 0.5 ⁇ R1/f ⁇ 1.2 is beneficial to shortening the total length of the system; at the same time, it is also beneficial to increase the amount of light entering the system to increase the intensity of infrared light reaching the imaging surface.
  • the second lens has a positive power or a negative power, and the object side may be a convex surface, which is advantageous for balancing the off-axis aberration and improving the image quality.
  • the second lens may have positive refractive power, and the effective focal length f2 and the total effective focal length f of the imaging lens group may satisfy 2 ⁇ f2/f ⁇ 8, and more specifically, f2 and f may further satisfy 2.39 ⁇ F2/f ⁇ 7.19. Satisfying the conditional expression 2 ⁇ f2/f ⁇ 8 is beneficial to the system power and aberration balance and shortening the total length of the system.
  • the object side of the second lens may be a convex surface, and the image side may be a concave surface.
  • the radius of curvature R3 of the side surface of the second lens object and the radius of curvature R4 of the side surface of the second lens image may satisfy 0.5 ⁇ R3 / R4 ⁇ 1, and more specifically, R3 and R4 may further satisfy 0.65 ⁇ R3 / R4 ⁇ 0.85. Satisfying the conditional expression 0.5 ⁇ R3/R4 ⁇ 1 is advantageous for dispersing the power of the first lens, thereby avoiding excessive bending of the first lens surface due to excessive concentration of the power, which is difficult to manufacture; ⁇ R3/R4 ⁇ 1 is also beneficial to increase the amount of light entering the system.
  • the third lens may have a positive power, and the image side may be a convex surface.
  • Such an arrangement facilitates the dispersion of the power, thereby reducing the angle between the off-axis field of view light and the optical axis, thereby improving the off-axis field of view.
  • the problem of astigmatism is a problem of astigmatism.
  • the fourth lens has a positive power or a negative power, and the image side is a concave surface. Such an arrangement facilitates the imaging side closer to the object side, thereby shortening the overall length of the system and achieving miniaturization.
  • at least one of the object side and the image side of the fourth lens has at least one inflection point.
  • the object side or image side of the fourth lens has at least one inflection point, which can adjust the off-axis field of view optical path, reduce the surface incident angle of the off-axis field of view, and at the same time reduce the coma and astigmatism of the off-axis field of view.
  • the center thickness of each lens and the separation distance between the lenses can be optimized to achieve better optical performance of the image pickup lens group.
  • the center thickness CT1 of the first lens on the optical axis and the center thickness CT3 of the third lens on the optical axis may satisfy 0.6 ⁇ CT1/CT3 ⁇ 1.3, and more specifically, CT1 and CT3 may further satisfy 0.67 ⁇ CT1/CT3. ⁇ 1.24. Satisfying the conditional expression 0.6 ⁇ CT1/CT3 ⁇ 1.3, it is advantageous to disperse the system power to avoid excessive concentration of the power on the first lens or the third lens, thereby avoiding tolerance sensitivity due to excessive concentration of power. And problems such as excessive bending of the lens surface due to excessive concentration of the power, and difficulty in molding.
  • the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis may satisfy 0.4 ⁇ CT1/(CT2+CT3) ⁇ 0.9. More specifically, CT1, CT2, and CT3 can further satisfy 0.43 ⁇ CT1/(CT2+CT3) ⁇ 0.73. Satisfying the conditional formula 0.4 ⁇ CT1/(CT2+CT3) ⁇ 0.9, which helps the first lens, the second lens and the third lens to obtain a more reasonable spatial layout, thereby facilitating the dispersion of the system power and the shaping of the lens. .
  • All lenses having power in the image pickup lens group (when the image pickup lens group includes four lenses having powers, all lenses having power are referred to as a first lens, a second lens, a third lens, and a fourth
  • the sum of the central thickness of the lens on the optical axis ⁇ CT and the total optical length TTL of the imaging lens group (ie, the distance from the center of the side of the first lens to the on-axis of the imaging surface) can satisfy ⁇ CT/TTL ⁇ 0.6, more specifically, ⁇ CT and TTL can further satisfy 0.46 ⁇ ⁇ CT / TTL ⁇ 0.51.
  • the conditional formula ⁇ CT/TTL ⁇ 0.6 is satisfied, which is advantageous for shortening the overall length of the lens group.
  • increasing the separation distance between the lenses is also beneficial to reduce the tolerance sensitivity of the system and improve the quality and consistency of the mass production of the lens group.
  • the distance between the first lens and the second lens on the optical axis and the optical total length TTL of the image pickup lens group can satisfy T12/TTL ⁇ 0.2. More specifically, T12 and TTL can further satisfy 0.06 ⁇ T12/TTL ⁇ . 0.16.
  • the conditional expression T12/TTL ⁇ 0.2 is satisfied, which is advantageous for compressing the effective aperture of the second lens, reducing the size of the lens group, and achieving miniaturization characteristics.
  • the effective half-diameter DT11 of the side of the first lens object can satisfy 0.5 ⁇ DT11/ImgH ⁇ 1 between half and 1 mgH of the diagonal length of the effective pixel area on the imaging surface. More specifically, DT11 and ImgH can further satisfy 0.52 ⁇ DT11/ ImgH ⁇ 0.63. Satisfying the conditional formula 0.5 ⁇ DT11/ImgH ⁇ 1 is beneficial to shortening the overall length of the lens group; at the same time, the system can have a large amount of light entering, and improve the signal-to-noise ratio of the output signal of the photosensitive element.
  • the effective half-diameter DT42 of the side of the fourth lens image satisfies 0.7 ⁇ DT42/ImgH ⁇ 1 between half of the diagonal length of the effective pixel area on the imaging surface, and more specifically, DT42 and ImgH can further satisfy 0.83 ⁇ DT42/ ImgH ⁇ 0.99. Satisfying the conditional expression of 0.7 ⁇ DT42 / ImgH ⁇ 1 can avoid tolerance sensitivity due to excessive steepness of the off-axis light passing through the fourth lens; at the same time, such an arrangement is advantageous for miniaturization of the lens group.
  • the on-axis distance SAG21 between the intersection of the object side surface and the optical axis of the second lens to the effective half-diameter apex of the second lens object side and the center thickness CT2 of the second lens on the optical axis may satisfy 0 ⁇ SAG21/CT2 ⁇ 0.7, more specifically, SAG21 and CT2 can further satisfy 0.15 ⁇ SAG21 / CT2 ⁇ 0.60. Satisfying the conditional expression 0 ⁇ SAG21/CT2 ⁇ 0.7 is beneficial to reducing the effective aperture of the second lens, thereby facilitating processing and molding of the lens.
  • the total effective focal length f of the image pickup lens group and the entrance pupil diameter EPD of the image pickup lens group can satisfy f/EPD ⁇ 1.5, and more specifically, f and EPD can further satisfy 1.04 ⁇ f / EPD ⁇ 1.29. Satisfying the conditional expression f/EPD ⁇ 1.5 can effectively improve the energy density on the image plane, thereby facilitating the improvement of the signal-to-noise ratio of the image sensor output signal.
  • an infrared band pass filter may be disposed between the fourth lens and the imaging surface for filtering the infrared light to eliminate the chromatic aberration caused by the non-infrared light, the image blur, and the like, that is, eliminating the non-infrared light. Signal interference.
  • the image pickup lens group of the present application may further include at least one aperture.
  • the aperture can be disposed at any position between the object side and the image side as needed.
  • aberrations related to the pupil for example, coma, astigmatism, distortion, and axial chromatic aberration
  • the diaphragm may be disposed between the object side and the first lens.
  • the aperture may be disposed between the first lens and the second lens.
  • the above-described image pickup lens group may further include a cover glass for protecting the photosensitive member on the image forming surface.
  • the image pickup lens group according to the above embodiment of the present application may employ a plurality of lenses, such as the four sheets described above.
  • a plurality of lenses such as the four sheets described above.
  • the volume of the lens group can be effectively reduced, the sensitivity of the lens group can be reduced, and the lens group can be improved.
  • the processability makes the camera lens group more advantageous for production processing and can be applied to portable electronic products.
  • the image pickup lens group configured as described above also has advantageous effects such as ultra-thin, large aperture, high brightness, and high image quality.
  • At least one of the mirror faces of each lens is an aspherical mirror.
  • the aspherical lens is characterized by a continuous change in curvature from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion and improving astigmatic aberration. With an aspherical lens, the aberrations that occur during imaging can be eliminated as much as possible, improving image quality. In addition, the use of aspherical lenses can also effectively reduce the number of lenses in an optical system.
  • the various results and advantages described in this specification can be obtained without changing the number of lenses constituting the imaging lens group without departing from the technical solution claimed in the present application.
  • the image pickup lens group is not limited to including four lenses.
  • the imaging lens group may also include other numbers of lenses if desired.
  • FIG. 1 is a view showing the configuration of an image pickup lens unit according to Embodiment 1 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the object side and the first lens L1 to improve the imaging quality of the image pickup lens group.
  • Table 1 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group of Example 1, wherein the units of the radius of curvature and the thickness are each mm (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 group in Embodiment 1, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel region on the imaging surface S11 of the imaging lens group, ImgH, and the imaging lens group.
  • the total optical length TTL i.e., the distance from the center of the object side S1 of the first lens L1 to the on-axis of the imaging plane S11).
  • 2A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 1, which indicates that light beams of different wavelengths are deviated from a focus point after passing through the lens group.
  • 2B shows an astigmatism curve of the image pickup lens group of Embodiment 1, which shows a meridional field curvature and a sagittal image plane curvature.
  • 2C shows a distortion curve of the image pickup lens group of Embodiment 1, which shows distortion magnitude values in the case of different viewing angles.
  • 2D shows a magnification chromatic aberration curve of the image pickup lens unit of Embodiment 1, which indicates a deviation of different image heights on the image plane after the light rays pass through the lens group.
  • 2E shows a phase contrast curve of the image pickup lens group of Embodiment 1, which shows the relative illuminance corresponding to different image heights on the image plane.
  • the imaging lens group given in Embodiment 1 can achieve good image quality.
  • FIG. 3 is a view showing the configuration of an image pickup lens unit according to Embodiment 2 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 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 negative 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the first lens L1 and the second lens L2 to improve the image quality of the image pickup lens group.
  • Table 4 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group of Example 2, wherein the units of the radius of curvature and the thickness are each mm (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 image pickup lens group in Embodiment 2, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area on the imaging surface of the image pickup lens group, ImgH, and the optical of the image pickup lens group. Total length TTL.
  • 4A is a graph showing an axial chromatic aberration curve of the image pickup lens unit of Embodiment 2, which shows that light rays of different wavelengths are deviated from a focus point after passing through the lens group.
  • 4B shows an astigmatism curve of the image pickup lens group of Embodiment 2, which shows meridional field curvature and sagittal image plane curvature.
  • 4C shows a distortion curve of the image pickup lens group of Embodiment 2, which shows the distortion magnitude value in the case of different viewing angles.
  • 4D shows a magnification chromatic aberration curve of the imaging lens unit of Embodiment 2, which shows deviations of different image heights on the imaging plane after the light passes through the lens group.
  • 4E shows a phase contrast curve of the image pickup lens group of Embodiment 2, which shows the degree of contrast corresponding to different image heights on the image plane. 4A to 4E, the imaging lens group given in Embodiment 2 can achieve good image quality.
  • FIG. 5 is a view showing the configuration of an image pickup lens unit according to Embodiment 3 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 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 negative 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the first lens L1 and the second lens L2 to improve the image quality of the image pickup lens group.
  • Table 7 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group of Example 3, wherein the units of the radius of curvature and the thickness are each mm (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 image pickup lens group 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 on the imaging surface of the image pickup lens group, ImgH, and the optical of the image pickup lens group. Total length TTL.
  • Fig. 6A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 3, which shows that the light beams of different wavelengths are deviated from the focus point after passing through the lens group.
  • Fig. 6B shows an astigmatism curve of the image pickup lens group of Embodiment 3, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 6C shows a distortion curve of the image pickup lens group of Embodiment 3, which shows the distortion magnitude value in the case of different viewing angles.
  • Fig. 6D shows a magnification chromatic aberration curve of the imaging lens unit of Embodiment 3, which shows deviations of different image heights on the imaging plane after the light passes through the lens group.
  • Fig. 6E shows a phase contrast curve of the image pickup lens group of Embodiment 3, which shows the degree of contrast corresponding to different image heights on the image plane. 6A to 6E, the imaging lens group given in Embodiment 3 can achieve good imaging quality
  • FIG. 7 is a view showing the configuration of an image pickup lens unit according to Embodiment 4 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 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 negative refractive power
  • the object side surface S7 is a concave 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the first lens L1 and the second lens L2 to improve the image quality of the image pickup lens group.
  • Table 10 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group of Example 4, wherein the units of the radius of curvature and the thickness are each mm (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 image pickup lens group in Embodiment 4, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area on the imaging surface of the image pickup lens group, ImgH, and the optical of the image pickup lens group. Total length TTL.
  • Fig. 8A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 4, which shows that the light beams of different wavelengths are deviated from the focus point after passing through the lens group.
  • Fig. 8B shows an astigmatism curve of the image pickup lens group of Embodiment 4, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 8C shows a distortion curve of the image pickup lens group of Embodiment 4, which shows the distortion magnitude value in the case of different viewing angles.
  • Fig. 8D shows a magnification chromatic aberration curve of the image pickup lens unit of Embodiment 4, which shows deviations of different image heights on the image plane after the light rays pass through the lens group.
  • Fig. 8E shows a phase contrast curve of the image pickup lens group of Embodiment 4, which shows the degree of contrast corresponding to different image heights on the image plane. 8A to 8E, the imaging lens group given in Embodiment 4 can
  • FIG. 9 is a view showing the configuration of an image pickup lens unit according to Embodiment 5 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 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 negative 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the object side and the first lens L1 to improve the imaging quality of the image pickup lens group.
  • Table 13 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group of Example 5, wherein the units 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 image pickup lens group in Embodiment 5, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area on the imaging surface of the image pickup lens group, ImgH, and the optical of the image pickup lens group. Total length TTL.
  • Fig. 10A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 5, which shows that the light beams of different wavelengths are deviated from the focus point after passing through the lens group.
  • Fig. 10B shows an astigmatism curve of the image pickup lens group of Embodiment 5, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 10C shows a distortion curve of the image pickup lens group of Embodiment 5, which shows the distortion magnitude value in the case of different viewing angles.
  • Fig. 10D shows a magnification chromatic aberration curve of the imaging lens unit of Embodiment 5, which shows deviations of different image heights on the imaging plane after the light passes through the lens group.
  • Fig. 10A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 5, which shows that the light beams of different wavelengths are deviated from the focus point after passing through the lens group.
  • Fig. 10B shows an as
  • 10E is a view showing a phase contrast curve of the image pickup lens group of Embodiment 5, which shows the degree of contrast corresponding to different image heights on the image plane. 10A to 10E, the imaging lens group given in Embodiment 5 can achieve good image quality.
  • FIG. 11 is a view showing the configuration of an image pickup lens unit according to Embodiment 6 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 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 negative 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the object side and the first lens L1 to improve the imaging quality of the image pickup lens group.
  • Table 16 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group 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 image pickup lens group in Embodiment 6, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area on the imaging surface of the image pickup lens group, ImgH, and the optical of the image pickup lens group. Total length TTL.
  • Fig. 12A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 6, which shows that the light beams of different wavelengths are deviated from the focus point after passing through the lens group.
  • Fig. 12B shows an astigmatism curve of the image pickup lens group of Embodiment 6, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 12C shows a distortion curve of the image pickup lens unit of Embodiment 6, which shows the distortion magnitude value in the case of different viewing angles.
  • Fig. 12D is a graph showing the chromatic aberration of magnification of the image pickup lens unit of Embodiment 6, which shows the deviation of the different image heights on the image plane after the light rays pass through the lens group.
  • Fig. 12E is a view showing a phase contrast curve of the image pickup lens unit of Embodiment 6, which shows the degree of contrast corresponding to different image heights on the image plane. 12A to 12E, the imaging lens unit given in Embodiment 6 can achieve good image quality.
  • FIG. 13 is a view showing the configuration of an image pickup lens unit according to Embodiment 7 of the present application.
  • the imaging lens group 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 image pickup lens group may further include a photosensitive member disposed on the image plane S11.
  • the first lens L1 has a positive refractive power
  • the object side surface S1 is a convex 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 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 negative refractive power
  • the object side surface S7 is a concave 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 image pickup lens group may further include a filter L5 having an object side surface S9 and an image side surface S10.
  • the filter L5 can be an infrared band pass filter. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging plane S11.
  • a stop STO for limiting the light beam may be disposed between the first lens L1 and the second lens L2 to improve the image quality of the image pickup lens group.
  • Table 19 shows the surface type, the radius of curvature, the thickness, the material, and the conical coefficient of each lens of the image pickup lens group of Example 7, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 20 shows the high order term coefficients which can be used for the respective aspherical mirrors in Embodiment 7, wherein each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.
  • Table 21 shows the total effective focal length f of the image pickup lens group in Embodiment 7, the effective focal lengths f1 to f4 of the respective lenses, the half of the diagonal length of the effective pixel area on the imaging surface of the image pickup lens group, ImgH, and the optical of the image pickup lens group. Total length TTL.
  • Fig. 14A shows an axial chromatic aberration curve of the image pickup lens unit of Embodiment 7, which shows that the light beams of different wavelengths are deviated from the focus point after passing through the lens group.
  • Fig. 14B shows an astigmatism curve of the image pickup lens group of Embodiment 7, which shows the meridional field curvature and the sagittal image plane curvature.
  • Fig. 14C shows a distortion curve of the image pickup lens group of Embodiment 7, which shows the distortion magnitude value in the case of different viewing angles.
  • Fig. 14D shows a magnification chromatic aberration curve of the image pickup lens unit of Embodiment 7, which shows the deviation of the different image heights on the image plane after the light rays pass through the lens group.
  • Fig. 14E shows a phase contrast curve of the image pickup lens unit of Embodiment 7, which shows the degree of contrast corresponding to different image heights on the image plane. 14A to 14E, the imaging lens group given in Embodiment 7 can achieve good image quality.
  • Embodiments 1 to 7 respectively satisfy the relationships shown in Table 22 below.
  • the application also provides an imaging device, the electronic photosensitive element of which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).
  • the camera device may be an independent camera device such as a digital camera, or may be a camera module integrated on a mobile electronic device such as a mobile phone.
  • This image pickup apparatus is equipped with the above-described image pickup lens group.

Abstract

一种摄像透镜组，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)和第二透镜(L2)的物侧面(S1、S3)均为凸面；第三透镜(L3)的像侧面(S6)为凸面；第四透镜(L4)的像侧面(S8)为凹面；第一透镜(L1)和第三透镜(L3)均具有正屈光力；第二透镜(L2)和第四透镜(L4)均具有正屈光力或负屈光力；摄像透镜组的总有效焦距f与摄像透镜组的入瞳直径EPD满足f/EPD＜1.5。

Description

摄像透镜组
相关申请的交叉引用
本申请要求于2017年8月24日提交于中国国家知识产权局(SIPO)的、专利申请号为201710735300.8的中国专利申请以及于2017年8月24日提交至SIPO的、专利申请号为201721066452.5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
本申请涉及一种摄像透镜组，更具体地，本申请涉及一种包括四片透镜的大孔径、高亮度的摄像透镜组。
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，对于相配套的光学成像系统的高成像品质及小型化提出了更高的要求。
为了满足小型化的要求，现有摄像透镜组通常配置的光圈数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，以在实现小型化的同时具有良好的光学性能。但是随着智能手机等便携式电子产品的不断发展，对相配套的摄像透镜组提出了更高的要求，特别是在针对光线不足(如阴雨天、黄昏等)、手抖等情况下，此光圈数Fno为2.0或2.0以上的摄像透镜组已经无法满足更高阶的成像要求。
特别地，在红外相机领域，摄像透镜组还需要在保证小尺寸的同时具有较大孔径以及较高的亮度，才能确保红外镜头在探测、识别等领域的较佳应用。
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摄像透镜组。
一方面，本申请提供了一种摄像透镜组，该摄像透镜组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。第一透镜和第二透镜的物侧面均可为凸面；第三透镜的像侧面可为凸面；第四透镜的像侧面可为凹面；第一透镜和第三透镜均可具有正光焦度；第二透镜和第四透镜均具有正光焦度或负光焦度；摄像透镜组的总有效焦距f与摄像透镜组的入瞳直径EPD可满足f/EPD＜1.5。
在一个实施方式中，第二透镜的像侧面可为凹面，第二透镜物侧面的曲率半径R3与第二透镜像侧面的曲率半径R4可满足0.5＜R3/R4＜1。
在一个实施方式中，第二透镜可具有正光焦度，其有效焦距f2与摄像透镜组的总有效焦距f可满足2＜f2/f＜8。
在一个实施方式中，第一透镜物侧面的曲率半径R1与摄像透镜组的总有效焦距f可满足0.5＜R1/f＜1.2。
在一个实施方式中，第一透镜和第二透镜在光轴上的间隔距离T12与第一透镜的物侧面至摄像透镜组成像面的轴上距离TTL可满足T12/TTL＜0.2。
在一个实施方式中，第一透镜于光轴上的中心厚度CT1与第三透镜于光轴上的中心厚度CT3可满足0.6＜CT1/CT3＜1.3。
在一个实施方式中，第一透镜于光轴上的中心厚度CT1、第二透镜于光轴上的中心厚度CT2以及第三透镜于光轴上的中心厚度CT3可满足0.4＜CT1/(CT2+CT3)＜0.9。
在一个实施方式中，第一透镜、第二透镜、第三透镜和第四透镜分别于光轴上的中心厚度的总和∑CT与第一透镜的物侧面至摄像透镜组成像面的轴上距离TTL可满足∑CT/TTL＜0.6。
在一个实施方式中，第四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，第四透镜像侧面的有效半口径DT42与摄像透镜组成像面上有效像素区域对角线长的一半ImgH可满足0.7＜DT42/ImgH＜1。
在一个实施方式中，第一透镜物侧面的有效半口径DT11与摄像 透镜组成像面上有效像素区域对角线长的一半ImgH可满足0.5＜DT11/ImgH＜1。
在一个实施方式中，第二透镜物侧面和光轴的交点至第二透镜物侧面的有效半口径顶点在光轴上的距离SAG21与第二透镜于光轴上的中心厚度CT2可满足0＜SAG21/CT2＜0.7。
在一个实施方式中，摄像透镜组还可包括设置于第四透镜与成像面之间的红外带通滤光片。
另一方面，本申请还提供了一种摄像透镜组，该摄像透镜组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凸面；第三透镜的物侧面和像侧面中的至少一个可为凸面；第四透镜的物侧面和像侧面中的至少一个可为凹面；第一透镜、第三透镜和第四透镜中的至少两个可具有正光焦度；第二透镜可具有正光焦度，其有效焦距f2与摄像透镜组的总有效焦距f可满足2＜f2/f＜8。
在一个实施方式中，第一透镜和第三透镜均可具有正光焦度。
在一个实施方式中，第四透镜的像侧面可为凹面。
在一个实施方式中，第二透镜的物侧面可为凸面，像侧面可为凹面。
另一方面，本申请还提供了一种摄像透镜组，该摄像透镜组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。第一透镜和第二透镜的物侧面均可为凸面；第三透镜的像侧面可为凸面；第四透镜的像侧面可为凹面；第一透镜和第三透镜均可具有正光焦度；第二透镜和第四透镜均具有正光焦度或负光焦度。其中，第一透镜物侧面的有效半口径DT11与摄像透镜组成像面上有效像素区域对角线长的一半ImgH可满足0.5＜DT11/ImgH＜1。
另一方面，本申请还提供了一种摄像透镜组，该摄像透镜组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。第一透镜和第二透镜的物侧面均可为凸面；第三透镜的像侧面可为凸面；第四透镜的像侧面可为凹面；第一透镜和第三透镜均可具有 正光焦度；第二透镜和第四透镜均具有正光焦度或负光焦度。其中，第二透镜物侧面的曲率半径R3与第二透镜像侧面的曲率半径R4可满足0.5＜R3/R4＜1。
另一方面，本申请还提供了一种摄像透镜组，该摄像透镜组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。第一透镜和第二透镜的物侧面均可为凸面；第三透镜的像侧面可为凸面；第四透镜的像侧面可为凹面；第一透镜和第三透镜均可具有正光焦度；第二透镜和第四透镜均具有正光焦度或负光焦度。其中，第四透镜像侧面的有效半口径DT42与摄像透镜组成像面上有效像素区域对角线长的一半ImgH可满足0.7＜DT42/ImgH＜1。
另一方面，本申请还提供了一种摄像透镜组，该摄像透镜组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。第一透镜和第二透镜的物侧面均可为凸面；第三透镜的像侧面可为凸面；第四透镜的像侧面可为凹面；第一透镜和第三透镜均可具有正光焦度；第二透镜和第四透镜均具有正光焦度或负光焦度。其中，第二透镜物侧面和光轴的交点至第二透镜物侧面的有效半口径顶点在光轴上的距离SAG21与第二透镜于光轴上的中心厚度CT2可满足0＜SAG21/CT2＜0.7。
另一方面，本申请还提供了一种摄像透镜组，该摄像透镜组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。第一透镜和第二透镜的物侧面均可为凸面；第三透镜的像侧面可为凸面；第四透镜的像侧面可为凹面；第一透镜和第三透镜均可具有正光焦度；第二透镜和第四透镜均具有正光焦度或负光焦度。摄像透镜组还可包括设置于第四透镜与成像面之间的红外带通滤光片。
本申请采用了例如四片透镜，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，使得透镜组在实现良好成像质量的同时，具有超薄、小型化、低敏感度、大孔径、高亮度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的摄像透镜组的结构示意图；
图2A至图2E分别示出了实施例1的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线；
图3示出了根据本申请实施例2的摄像透镜组的结构示意图；
图4A至图4E分别示出了实施例2的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线；
图5示出了根据本申请实施例3的摄像透镜组的结构示意图；
图6A至图6E分别示出了实施例3的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线；
图7示出了根据本申请实施例4的摄像透镜组的结构示意图；
图8A至图8E分别示出了实施例4的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线；
图9示出了根据本申请实施例5的摄像透镜组的结构示意图；
图10A至图10E分别示出了实施例5的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线；
图11示出了根据本申请实施例6的摄像透镜组的结构示意图；
图12A至图12E分别示出了实施例6的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线；
图13示出了根据本申请实施例7的摄像透镜组的结构示意图；
图14A至图14E分别示出了实施例7的摄像透镜组的轴上色差曲线、象散曲线、畸变曲线、倍率色差曲线以及相对照度曲线。
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摄像透镜组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。这四片透镜沿着光轴从物侧至像侧依序排列。
摄像透镜组还可包括设置于成像面的感光元件，感光元件的有效像素区域对角线长的一半为ImgH。
第一透镜可具有正光焦度，其具有较大折光能力，有利于缩短透镜组整体长度，减小透镜组体积。第一透镜的物侧面可为凸面，其物侧面的曲率半径R1与摄像透镜组的总有效焦距f之间可满足0.5＜R1/f＜1.2，更具体地，R1和f进一步可满足0.58≤R1/f≤0.74。满足条件式0.5＜R1/f＜1.2，有利于缩短系统总长；同时，还有利于增加系统进光量以提高到达成像面的红外光强度。
第二透镜具有正光焦度或负光焦度，其物侧面可为凸面，有利于平衡轴外像差，提高成像质量。可选地，第二透镜可具有正光焦度，其有效焦距f2与摄像透镜组的总有效焦距f之间可满足2＜f2/f＜8，更具体地，f2和f进一步可满足2.39≤f2/f≤7.19。满足条件式2＜f2/f＜8，有利于系统光焦度与像差平衡，缩短系统总长。
可选地，第二透镜的物侧面可为凸面，像侧面可为凹面。第二透镜物侧面的曲率半径R3与第二透镜像侧面的曲率半径R4之间可满足0.5＜R3/R4＜1，更具体地，R3和R4进一步可满足0.65≤R3/R4≤0.85。满足条件式0.5＜R3/R4＜1，有利于分散第一透镜的光焦度，从而避免因光焦度过于集中而导致第一透镜表面过度弯曲，制造难度较大；同时，满足条件式0.5＜R3/R4＜1也有利于增加系统进光量。
第三透镜可具有正光焦度，其像侧面可为凸面，这样的布置有利于光焦度的分散，从而可减小轴外视场光线与光轴的夹角，进而改善轴外视场的象散问题。
第四透镜具有正光焦度或负光焦度，其像侧面为凹面，这样的布置有利于成像面向物侧靠近，从而缩短系统整体长度，实现小型化。可选地，第四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。第四透镜的物侧面或像侧面具有至少一个反曲点，可以调节轴外视场光路，降低轴外视场的表面入射角，同时可以降低轴外视场的慧 差与像散。
在应用中，可对各透镜的中心厚度以及各透镜间的间隔距离进行优化，以实现摄像透镜组较佳的光学性能。
第一透镜于光轴上的中心厚度CT1与第三透镜于光轴上的中心厚度CT3之间可满足0.6＜CT1/CT3＜1.3，更具体地，CT1和CT3进一步可满足0.67≤CT1/CT3≤1.24。满足条件式0.6＜CT1/CT3＜1.3，有利于分散系统光焦度，以避免光焦度过度集中在第一透镜或第三透镜上，进而避免由于光焦度的过度集中而造成的公差敏感，以及由于光焦度的过度集中而造成的透镜表面过度弯曲、成型困难等问题。
第一透镜于光轴上的中心厚度CT1、第二透镜于光轴上的中心厚度CT2与第三透镜于光轴上的中心厚度CT3之间可满足0.4＜CT1/(CT2+CT3)＜0.9，更具体地，CT1、CT2和CT3进一步可满足0.43≤CT1/(CT2+CT3)≤0.73。满足条件式0.4＜CT1/(CT2+CT3)＜0.9，有助于第一透镜、第二透镜、第三透镜获得较为合理的空间布局，从而有利于系统光焦度的分散和镜片的成型加工。
摄像透镜组中所有具有光焦度的透镜(当摄像透镜组包括四片具有光焦度的透镜时，所有具有光焦度的透镜即指第一透镜、第二透镜、第三透镜和第四透镜)分别于光轴上的中心厚度的总和∑CT与摄像透镜组的光学总长度TTL(即，从第一透镜物侧面的中心至成像面的轴上距离)之间可满足∑CT/TTL＜0.6，更具体地，∑CT和TTL进一步可满足0.46≤∑CT/TTL≤0.51。满足条件式∑CT/TTL＜0.6，有利于缩短透镜组的整体长度。同时，增加各透镜之间的间隔距离也有利于降低系统的公差敏感性，提升透镜组批量生产的品质与一致性。
第一透镜和第二透镜在光轴上的间隔距离T12与摄像透镜组的光学总长度TTL之间可满足T12/TTL＜0.2，更具体地，T12和TTL进一步可满足0.06≤T12/TTL≤0.16。满足条件式T12/TTL＜0.2，有利于压缩第二透镜的有效口径，缩小透镜组尺寸，实现小型化特性。
第一透镜物侧面的有效半口径DT11与成像面上有效像素区域对角线长的一半ImgH之间可满足0.5＜DT11/ImgH＜1，更具体地，DT11和ImgH进一步可满足0.52≤DT11/ImgH≤0.63。满足条件式0.5＜ DT11/ImgH＜1，有利于缩短透镜组的整体长度；同时，还可以使得系统具有较大的进光量，提高感光元件输出信号信噪比。
第四透镜像侧面的有效半口径DT42与成像面上有效像素区域对角线长的一半ImgH之间可满足0.7＜DT42/ImgH＜1，更具体地，DT42和ImgH进一步可满足0.83≤DT42/ImgH≤0.99。满足条件式0.7＜DT42/ImgH＜1可以避免因轴外光线通过第四透镜时过于陡峭而产生的公差敏感；同时，这样的布置还有利于透镜组的小型化。
第二透镜的物侧面和光轴的交点至第二透镜物侧面的有效半口径顶点之间的轴上距离SAG21与第二透镜于光轴上的中心厚度CT2之间可满足0＜SAG21/CT2＜0.7，更具体地，SAG21和CT2进一步可满足0.15≤SAG21/CT2≤0.60。满足条件式0＜SAG21/CT2＜0.7，有利于减小第二透镜的有效口径，从而有利于镜片的加工与成型。
摄像透镜组的总有效焦距f与摄像透镜组的入瞳直径EPD之间可满足f/EPD＜1.5，更具体地，f和EPD进一步可满足1.04≤f/EPD≤1.29。满足条件式f/EPD＜1.5，能够有效地提高像面上的能量密度，从而有利于提高像方传感器输出信号信噪比。
可选地，在第四透镜与成像面之间可设置有红外带通滤光片，用来过滤通过红外光，消除非红外光造成的色差、成像模糊等问题，即消除非红外光带来的信号干扰。
在示例性实施方式中，本申请的摄像透镜组还可包括至少一个光阑。光阑可根据需要设置于物侧与像侧间的任意位置处。通过对光阑位置的适当选择，能够有效地矫正与光阑有关的像差(例如，慧差，像散，畸变和轴向色差)，以提高镜头的成像品质。可选地，光阑可设置于物侧与第一透镜之间。可选地，光阑可设置于第一透镜与第二透镜之间。
可选地，上述摄像透镜组还可包括用于保护位于成像面上的感光元件的保护玻璃。
根据本申请的上述实施方式的摄像透镜组可采用多片镜片，例如上文所述的四片。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，可有效地减小透镜组的体积、 降低透镜组的敏感度并提高透镜组的可加工性，使得摄像透镜组更有利于生产加工并且可适用于便携式电子产品。同时，通过上述配置的摄像透镜组，还具有例如超薄、大孔径、高亮度、高成像品质等有益效果。
在本申请的实施方式中，各透镜的镜面中的至少一个为非球面镜面。非球面透镜的特点是：从透镜中心到透镜周边，曲率是连续变化的。与从透镜中心到透镜周边具有恒定曲率的球面透镜不同，非球面透镜具有更佳的曲率半径特性，具有改善歪曲像差及改善像散像差的优点。采用非球面透镜后，能够尽可能地消除在成像的时候出现的像差，从而改善成像质量。另外，非球面透镜的使用还可有效地减少光学系统中的透镜个数。
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，可改变构成摄像透镜组的透镜数量，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，但是该摄像透镜组不限于包括四个透镜。如果需要，该摄像透镜组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摄像透镜组的具体实施例。
实施例1
以下参照图1至图2E描述根据本申请实施例1的摄像透镜组。图1示出了根据本申请实施例1的摄像透镜组的结构示意图。
如图1所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在物侧与第一透镜L1之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表1示出了实施例1的摄像透镜组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 PCTCN2018080106-appb-000001
表1
由表1可得，第二透镜L2的物侧面S3的曲率半径R3与第二透镜L2的像侧面S4的曲率半径R4之间满足R3/R4＝0.73；第一透镜L1于光轴上的中心厚度CT1与第三透镜L3于光轴上的中心厚度CT3之间满足CT1/CT3＝0.82；第一透镜L1于光轴上的中心厚度CT1、第二透镜L2于光轴上的中心厚度CT2以及第三透镜L3于光轴上的中心厚度CT3满足CT1/(CT2+CT3)＝0.52。
在实施例1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 PCTCN2018080106-appb-000002
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 -2.6901E-02 1.3274E-02 -2.1706E-02 2.5702E-02 -1.9823E-02 4.9245E-03 -1.0617E-04
S2 -4.2572E-02 -3.0394E-02 1.0206E-02 1.1631E-02 -1.5978E-02 4.9360E-03 1.8444E-04
S3 -1.8404E-01 -2.2932E-02 -1.9112E-01 1.8354E-01 -4.8139E-02 1.0335E-03 4.3675E-04
S4 2.3637E-02 -1.3993E-01 -1.5439E-01 2.7901E-01 -1.6071E-01 3.9760E-02 -3.2453E-03
S5 1.8305E-01 -3.5807E-01 4.7080E-01 -4.3425E-01 2.4972E-01 -8.9144E-02 1.4350E-02
S6 -4.8618E-01 1.2078E+00 -1.8554E+00 1.7025E+00 -9.0795E-01 2.5477E-01 -2.8524E-02
S7 -3.3394E-02 -5.2685E-02 4.0756E-02 -1.1570E-02 1.6497E-03 -1.1853E-04 3.2993E-06
S8 -1.3131E-01 7.0132E-02 -3.0786E-02 8.3243E-03 -1.2222E-03 8.6139E-05 -2.3107E-06
表2
下表3给出实施例1中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面S11上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL(即，从第一透镜L1的物侧面S1的中心至成像面S11的轴上距离)。
Figure PCTCN2018080106-appb-000003
表3
由上表1和表3可得，第二透镜L2的有效焦距f2与摄像透镜组的总有效焦距f之间满足f2/f＝2.56；第一透镜L1的物侧面S1的曲率半径R1与摄像透镜组的总有效焦距f之间满足R1/f＝0.74；第一透镜L1和第二透镜L2在光轴上的间隔距离T12与摄像透镜组的光学总长度TTL之间满足T12/TTL＝0.06；第一透镜L1、第二透镜L2、第三透 镜L3和第四透镜L4分别于光轴上的中心厚度的总和ΣCT与摄像透镜组的光学总长度TTL之间满足ΣCT/TTL＝0.48。
在实施例1中，摄像透镜组的总有效焦距f与摄像透镜组的入瞳直径EPD之间满足f/EPD＝1.12；第一透镜L1的物侧面S1的有效半口径DT11与摄像透镜组的成像面S11上有效像素区域对角线长的一半ImgH之间满足DT11/ImgH＝0.61；第四透镜L4的像侧面S8的有效半口径DT42与摄像透镜组的成像面S11上有效像素区域对角线长的一半ImgH之间满足DT42/ImgH＝0.99；第二透镜L2的物侧面S3和光轴的交点至第二透镜L2的物侧面S3的有效半口径顶点之间的轴上距离SAG21与第二透镜L2于光轴上的中心厚度CT2之间满足SAG21/CT2＝0.45。
图2A示出了实施例1的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图2B示出了实施例1的摄像透镜组的象散曲线，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的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图2D示出了实施例1的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图2E示出了实施例1的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图2A至图2E可知，实施例1所给出的摄像透镜组能够实现良好的成像品质。
实施例2
以下参照图3至图4E描述了根据本申请实施例2的摄像透镜组。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的摄像透镜组的结构示意图。
如图3所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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具有负光焦度，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在第一透镜L1与第二透镜L2之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表4示出了实施例2的摄像透镜组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中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL。
Figure PCTCN2018080106-appb-000004
表4
面号 A4 A6 A8 A10 A12 A14 A16
S1 -2.0938E-02 7.1645E-03 -1.2217E-02 1.5627E-02 -1.8137E-02 8.1936E-03 -1.5442E-03
S2 -3.7195E-02 -2.5868E-03 -2.0882E-02 8.3370E-03 6.8312E-03 -7.9328E-03 2.2755E-03
S3 -1.7076E-01 -8.0125E-02 -1.5436E-01 1.9385E-01 -7.2746E-02 -2.3434E-02 2.2857E-02
S4 -6.5556E-03 -1.2073E-01 -1.5830E-01 3.0988E-01 -1.9283E-01 3.1055E-02 6.8774E-03
S5 1.2179E-01 -3.3096E-01 4.7612E-01 -4.4101E-01 2.3203E-01 -7.9559E-02 1.5354E-02
S6 -6.3654E-01 1.5927E+00 -2.7276E+00 2.8992E+00 -1.8471E+00 6.3927E-01 -9.0844E-02
S7 -3.9350E-02 -1.9082E-03 1.0826E-02 -3.9619E-03 6.4006E-04 -4.8389E-05 1.3687E-06
S8 -8.5153E-02 3.7287E-02 -1.2320E-02 1.9163E-03 -1.0815E-04 0.0000E+00 0.0000E+00
表5
Figure PCTCN2018080106-appb-000005
表6
图4A示出了实施例2的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图4B示出了实施例2的摄像透镜组的象散曲线，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的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图4D示出了实施例2的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图4E示出了实施例2的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图4A至图4E可知，实施例2所给出的摄像透镜组能够实现良好的成像品质。
实施例3
以下参照图5至图6E描述了根据本申请实施例3的摄像透镜组。图5示出了根据本申请实施例3的摄像透镜组的结构示意图。
如图5所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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具有负光焦度，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在第一透镜L1与第二透镜L2之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表7示出了实施例3的摄像透镜组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中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL。
表7
面号 A4 A6 A8 A10 A12 A14 A16
S1 -2.4003E-02 -7.5346E-03 -6.7209E-03 6.0803E-03 -2.1473E-02 1.2364E-02 -1.7349E-03
S2 -4.0073E-02 -2.3053E-02 -2.7752E-02 1.6195E-02 3.3039E-03 -2.7646E-03 1.1259E-03
S3 -1.1578E-01 -5.0949E-03 -1.9019E-01 1.5170E-01 -7.7018E-02 1.4587E-02 2.2859E-02
S4 1.3480E-02 -1.3969E-01 -9.4474E-02 1.8379E-01 -2.4467E-01 1.0573E-01 6.9279E-03
S5 3.6031E-02 -1.6504E-01 2.2961E-01 -1.5991E-01 8.5202E-02 -7.9465E-02 1.5351E-02
S6 -2.2493E-01 6.6619E-01 -1.2917E+00 1.5860E+00 -1.0110E+00 3.0611E-01 -3.4677E-02
S7 -6.3749E-01 5.5138E-01 -4.7617E-01 4.1691E-01 -2.1333E-01 5.3312E-02 -5.1217E-03
S8 -3.7089E-01 3.4114E-01 -2.2096E-01 8.8733E-02 -1.9355E-02 1.5132E-03 5.8720E-05
表8
Figure PCTCN2018080106-appb-000007
表9
图6A示出了实施例3的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图6B示出了实施例3的摄像透镜组的象散曲线，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的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图6D示出了实施例3的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图6E示出了实施例3的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图6A至图6E可知，实施例3所给出的摄像透镜组能够实现良好的成像品质。
实施例4
以下参照图7至图8E描述了根据本申请实施例4的摄像透镜组。图7示出了根据本申请实施例4的摄像透镜组的结构示意图。
如图7所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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具有负光焦度，其物侧面S7为凹面，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在第一透镜L1与第二透镜L2之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表10示出了实施例4的摄像透镜组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中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL。
Figure PCTCN2018080106-appb-000008
表10
面号 A4 A6 A8 A10 A12 A14 A16
S1 -2.0810E-02 1.0243E-03 -1.6939E-02 1.0342E-02 -1.9783E-02 8.2773E-03 -6.2554E-04
S2 -3.2809E-02 -2.7210E-02 -3.3706E-02 1.6401E-02 4.4599E-03 -2.2500E-03 3.7039E-04
S3 -1.0678E-01 -1.8130E-02 -2.2494E-01 1.7703E-01 -5.5672E-02 1.4802E-03 2.2862E-02
S4 5.7671E-03 -7.3940E-02 -2.2723E-01 2.0698E-01 -1.4686E-01 6.1850E-02 6.9281E-03
S5 9.8829E-02 -2.1919E-01 3.0444E-01 -3.0595E-01 1.4302E-01 -7.9465E-02 1.5354E-02
S6 4.3080E-01 -1.3389E+00 2.6886E+00 -3.2470E+00 2.3066E+00 -8.7430E-01 1.3442E-01
S7 -6.1033E-02 -2.2569E-01 8.9914E-02 1.5523E-01 -1.3379E-01 3.8682E-02 -3.9081E-03
S8 -1.2317E-01 -1.4640E-02 3.8021E-02 -1.7027E-02 2.4742E-03 0.0000E+00 0.0000E+00
表11
Figure PCTCN2018080106-appb-000009
表12
图8A示出了实施例4的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图8B示出了实施例4的摄像透镜组的象散曲线，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的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图8D示出了实施例4的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图8E示出了实施例4的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图8A至图8E可知，实施例4所给出的摄像透镜组能够实现良好的成像品质。
实施例5
以下参照图9至图10E描述了根据本申请实施例5的摄像透镜组。图9示出了根据本申请实施例5的摄像透镜组的结构示意图。
如图9所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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具有负光焦度，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在物侧与第一透镜L1之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表13示出了实施例5的摄像透镜组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中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL。
Figure PCTCN2018080106-appb-000010
表13
面号 A4 A6 A8 A10 A12 A14 A16
S1 -2.3250E-02 1.2893E-02 -2.4007E-02 2.7438E-02 -1.7763E-02 4.3274E-03 -2.7176E-04
S2 -3.4032E-02 -2.8793E-02 6.9575E-03 1.3506E-02 -1.4905E-02 4.8235E-03 -2.7185E-04
S3 -1.4642E-01 -7.2124E-03 -1.9899E-01 1.8037E-01 -4.8210E-02 1.2564E-03 7.9764E-04
S4 4.1497E-02 -1.2358E-01 -1.7354E-01 2.7747E-01 -1.5679E-01 4.1506E-02 -4.2489E-03
S5 2.0810E-01 -3.4503E-01 4.5713E-01 -4.2868E-01 2.5249E-01 -8.7983E-02 1.3033E-02
S6 -5.2762E-01 1.2566E+00 -1.7746E+00 1.5308E+00 -7.7402E-01 2.0696E-01 -2.2267E-02
S7 2.5820E-03 -6.0664E-02 3.6590E-02 -9.2093E-03 1.1785E-03 -7.5594E-05 1.8882E-06
S8 -1.6514E-01 8.7381E-02 -3.3765E-02 7.9195E-03 -1.0446E-03 6.8360E-05 -1.7249E-06
表14
Figure PCTCN2018080106-appb-000011
表15
图10A示出了实施例5的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图10B示出了实施例5的摄像透镜组的象散曲线，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的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图10D示出了实施例5的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图10E示出了实施例5的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图10A至图10E可知，实施例5所给出的摄像透镜组能够实现良好的成像品质。
实施例6
以下参照图11至图12E描述了根据本申请实施例6的摄像透镜组。图11示出了根据本申请实施例6的摄像透镜组的结构示意图。
如图11所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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具有负光焦度，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在物侧与第一透镜L1之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表16示出了实施例6的摄像透镜组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中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL。
Figure PCTCN2018080106-appb-000012
表16
面号 A4 A6 A8 A10 A12 A14 A16
S1 -2.3376E-02 1.4573E-02 -2.2897E-02 2.4319E-02 -2.0369E-02 4.9972E-03 -1.1594E-03
S2 -4.4366E-02 -3.2311E-02 6.8656E-03 7.2142E-03 -1.8982E-02 4.2358E-03 2.6175E-03
S3 -2.0009E-01 -2.6864E-02 -1.9719E-01 1.8329E-01 -4.5768E-02 3.0644E-03 2.6472E-03
S4 -1.0260E-02 -1.2812E-01 -1.4368E-01 2.7669E-01 -1.6475E-01 3.8160E-02 -9.7948E-04
S5 1.5229E-01 -3.5551E-01 4.6689E-01 -4.3870E-01 2.4806E-01 -8.9129E-02 1.5086E-02
S6 -4.0351E-01 9.4437E-01 -1.6404E+00 1.7659E+00 -1.1170E+00 3.7355E-01 -4.9949E-02
S7 -2.0898E-01 6.1476E-02 1.8665E-02 -1.3512E-02 3.0181E-03 -3.0840E-04 1.1550E-05
S8 -1.7771E-01 1.0531E-01 -5.0484E-02 1.5890E-02 -2.7568E-03 2.2769E-04 -7.1017E-06
表17
Figure PCTCN2018080106-appb-000013
表18
图12A示出了实施例6的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图12B示出了实施例6的摄像透镜组的象散曲线，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的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图12D示出了实施例6的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图12E示出了实施例6的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图12A至图12E可知，实施例6所给出的摄像透镜组能够实现良好的成像品质。
实施例7
以下参照图13至图14E描述了根据本申请实施例7的摄像透镜组。图13示出了根据本申请实施例7的摄像透镜组的结构示意图。
如图13所示，摄像透镜组沿光轴由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。摄像透镜组还可包括设置于成像面S11的感光元件。
第一透镜L1具有正光焦度，其物侧面S1为凸面，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具有负光焦度，其物侧面S7为凹面，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，摄像透镜组还可包括具有物侧面S9和像侧面S10的滤光片L5。滤光片L5可为红外带通滤光片。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，可在第一透镜L1与第二透镜L2之间设置用于限制光束的光阑STO，以提升摄像透镜组的成像质量。
表19示出了实施例7的摄像透镜组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20示出了可用于实施例7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21示出了实施例7中摄像透镜组的总有效焦距f、各透镜的有效焦距f1至f4、摄像透镜组的成像面上有效像素区域对角线长的一半ImgH以及摄像透镜组的光学总长度TTL。
Figure PCTCN2018080106-appb-000014
表19
面号 A4 A6 A8 A10 A12 A14 A16
S1 -1.0082E-02 -1.3226E-02 2.9056E-03 6.9244E-03 -3.1481E-02 2.1629E-02 -5.1705E-03
S2 -2.4608E-02 2.0413E-03 -2.4382E-02 -1.4647E-02 -1.0636E-02 5.0419E-02 -2.5124E-02
S3 2.3108E-02 -4.9641E-02 -2.4065E-01 2.4119E-01 1.8248E-02 -6.8138E-02 2.2980E-02
S4 -7.2907E-02 -3.6797E-02 -1.1042E-01 1.7116E-01 -2.1745E-01 1.2981E-01 1.4286E-02
S5 7.8851E-02 -1.0625E-01 1.0834E-01 -2.3351E-01 1.7066E-01 -7.9201E-02 1.5354E-02
S6 -8.7334E-02 1.2519E-01 -5.9275E-02 8.5334E-03 -5.6340E-04 1.7758E-05 -2.1705E-07
S7 -1.6032E-02 -6.5518E-01 8.5780E-01 -4.8134E-01 1.4193E-01 -2.1562E-02 1.3338E-03
S8 -2.0882E-01 4.6067E-02 3.2161E-02 -2.3506E-02 3.8837E-03 0.0000E+00 0.0000E+00
表20
Figure PCTCN2018080106-appb-000015
表21
图14A示出了实施例7的摄像透镜组的轴上色差曲线，其表示不同波长的光线经由透镜组后的会聚焦点偏离。图14B示出了实施例7的摄像透镜组的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图14C示出了实施例7的摄像透镜组的畸变曲线，其表示不同视角情况下的畸变大小值。图14D示出了实施例7的摄像透镜组的倍率色差曲线，其表示光线经由透镜组后在成像面上的不同的像高的偏差。图14E示出了实施例7的摄像透镜组的相对照度曲线，其表示成像面上不同像高所对应的相对照度。根据图14A至图14E可知，实施例7所给出的摄像透镜组能够实现良好的成像品质。
综上，实施例1至实施例7分别满足以下表22所示的关系。
条件式\实施例 1 2 3 4 5 6 7
f/EPD 1.12 1.20 1.24 1.24 1.04 1.29 1.24
R3/R4 0.73 0.85 0.66 0.65 0.69 0.75 0.77
f2/f 2.56 4.69 2.85 2.74 2.39 2.98 7.19
R1/f 0.74 0.71 0.62 0.58 0.74 0.67 0.62
T12/TTL 0.06 0.08 0.11 0.11 0.06 0.06 0.16
CT1/CT3 0.82 0.80 1.10 1.22 1.12 0.67 1.24
CT1/(CT2+CT3) 0.52 0.53 0.62 0.67 0.65 0.43 0.73
∑CT/TTL 0.48 0.51 0.46 0.46 0.50 0.47 0.48
DT11/ImgH 0.61 0.60 0.57 0.57 0.63 0.52 0.57
DT42/ImgH 0.99 0.95 0.84 0.83 0.99 0.99 0.84
SAG21/CT2 0.45 0.30 0.60 0.58 0.43 0.15 0.17
表22
本申请还提供一种摄像装置，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)。摄像装置可以是诸如数码相机的独立摄像设备，也可以是集成在诸如手机等移动电子设备上的摄像模块。该摄像装置装配有以上描述的摄像透镜组。
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 (29)

  1. 摄像透镜组，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，
    所述第一透镜和所述第二透镜的物侧面均为凸面；
    所述第三透镜的像侧面为凸面；
    所述第四透镜的像侧面为凹面；
    所述第一透镜和所述第三透镜均具有正光焦度；
    所述第二透镜和所述第四透镜均具有正光焦度或负光焦度；
    所述摄像透镜组的总有效焦距f与所述摄像透镜组的入瞳直径EPD满足f/EPD＜1.5。
  2. 根据权利要求1所述的摄像透镜组，其特征在于，所述第二透镜的像侧面为凹面，所述第二透镜物侧面的曲率半径R3与所述第二透镜像侧面的曲率半径R4满足0.5＜R3/R4＜1。
  3. 根据权利要求1或2所述的摄像透镜组，其特征在于，所述第二透镜具有正光焦度，其有效焦距f2与所述摄像透镜组的总有效焦距f满足2＜f2/f＜8。
  4. 根据权利要求1所述的摄像透镜组，其特征在于，所述第一透镜物侧面的曲率半径R1与所述摄像透镜组的总有效焦距f满足0.5＜R1/f＜1.2。
  5. 根据权利要求1、2或4中任一项所述的摄像透镜组，其特征在于，所述第一透镜和所述第二透镜在所述光轴上的间隔距离T12与所述第一透镜的物侧面至所述摄像透镜组成像面的轴上距离TTL满足T12/TTL＜0.2。
  6. 根据权利要求1所述的摄像透镜组，其特征在于，所述第一透 镜于所述光轴上的中心厚度CT1与所述第三透镜于所述光轴上的中心厚度CT3满足0.6＜CT1/CT3＜1.3。
  7. 根据权利要求1所述的摄像透镜组，其特征在于，所述第一透镜于所述光轴上的中心厚度CT1、所述第二透镜于所述光轴上的中心厚度CT2以及所述第三透镜于所述光轴上的中心厚度CT3满足0.4＜CT1/(CT2+CT3)＜0.9。
  8. 根据权利要求1、6或7中任一项所述的摄像透镜组，其特征在于，所述第一透镜、所述第二透镜、所述第三透镜和所述第四透镜分别于所述光轴上的中心厚度的总和∑CT与所述第一透镜的物侧面至所述摄像透镜组成像面的轴上距离TTL满足∑CT/TTL＜0.6。
  9. 根据权利要求1所述的摄像透镜组，其特征在于，所述第一透镜物侧面的有效半口径DT11与所述摄像透镜组成像面上有效像素区域对角线长的一半ImgH满足0.5＜DT11/ImgH＜1。
  10. 根据权利要求1所述的摄像透镜组，其特征在于，所述第四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或10所述的摄像透镜组，其特征在于，所述第四透镜像侧面的有效半口径DT42与所述摄像透镜组成像面上有效像素区域对角线长的一半ImgH满足0.7＜DT42/ImgH＜1。
  12. 根据权利要求1或2所述的摄像透镜组，其特征在于，所述第二透镜物侧面和所述光轴的交点至所述第二透镜物侧面的有效半口径顶点在所述光轴上的距离SAG21与所述第二透镜于所述光轴上的中心厚度CT2满足0＜SAG21/CT2＜0.7。
  13. 根据权利要求1所述的摄像透镜组，其特征在于，所述摄像 透镜组还包括设置于所述第四透镜与所述成像面之间的红外带通滤光片。
  14. 摄像透镜组，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凸面；
    所述第三透镜的物侧面和像侧面中的至少一个为凸面；
    所述第四透镜的物侧面和像侧面中的至少一个为凹面；
    所述第一透镜、所述第三透镜和所述第四透镜中的至少两个具有正光焦度；
    所述第二透镜具有正光焦度，其有效焦距f2与所述摄像透镜组的总有效焦距f满足2＜f2/f＜8。
  15. 根据权利要求14所述的摄像透镜组，其特征在于，所述第一透镜和所述第三透镜均具有正光焦度。
  16. 根据权利要求15所述的摄像透镜组，其特征在于，所述第一透镜于所述光轴上的中心厚度CT1与所述第三透镜于所述光轴上的中心厚度CT3满足0.6＜CT1/CT3＜1.3。
  17. 根据权利要求15所述的摄像透镜组，其特征在于，所述第一透镜于所述光轴上的中心厚度CT1、所述第二透镜于所述光轴上的中心厚度CT2以及所述第三透镜于所述光轴上的中心厚度CT3满足0.4＜CT1/(CT2+CT3)＜0.9。
  18. 根据权利要求14所述的摄像透镜组，其特征在于，所述第一透镜、所述第二透镜、所述第三透镜和所述第四透镜分别于所述光轴上的中心厚度的总和∑CT与所述第一透镜的物侧面至所述摄像透镜组成像面的轴上距离TTL满足∑CT/TTL＜0.6。
  19. 根据权利要求18所述的摄像透镜组，其特征在于，所述第一透镜和所述第二透镜在所述光轴上的间隔距离T12与所述第一透镜的物侧面至所述摄像透镜组成像面的轴上距离TTL满足T12/TTL＜0.2。
  20. 根据权利要求14所述的摄像透镜组，其特征在于，所述第四透镜的像侧面为凹面。
  21. 根据权利要求20所述的摄像透镜组，其特征在于，所述第四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。
  22. 根据权利要求21所述的摄像透镜组，其特征在于，所述第四透镜像侧面的有效半口径DT42与所述摄像透镜组成像面上有效像素区域对角线长的一半ImgH满足0.7＜DT42/ImgH＜1。
  23. 根据权利要求14所述的摄像透镜组，其特征在于，所述第一透镜物侧面的有效半口径DT11与所述摄像透镜组成像面上有效像素区域对角线长的一半ImgH满足0.5＜DT11/ImgH＜1。
  24. 根据权利要求14所述的摄像透镜组，其特征在于，所述第二透镜的物侧面为凸面，像侧面为凹面。
  25. 根据权利要求24所述的摄像透镜组，其特征在于，所述第二透镜物侧面的曲率半径R3与所述第二透镜像侧面的曲率半径R4满足0.5＜R3/R4＜1。
  26. 根据权利要求24所述的摄像透镜组，其特征在于，所述第二透镜物侧面和所述光轴的交点至所述第二透镜物侧面的有效半口径顶点在所述光轴上的距离SAG21与所述第二透镜于所述光轴上的中心厚度CT2满足0＜SAG21/CT2＜0.7。
  27. 根据权利要求14所述的摄像透镜组，其特征在于，所述第一透镜物侧面的曲率半径R1与所述摄像透镜组的总有效焦距f满足0.5＜R1/f＜1.2。
  28. 根据权利要求27所述的摄像透镜组，其特征在于，所述摄像透镜组的总有效焦距f与所述摄像透镜组的入瞳直径EPD满足f/EPD＜1.5。
  29. 根据权利要求14至28中任一项所述的摄像透镜组，其特征在于，所述摄像透镜组还包括设置于所述第四透镜与所述成像面之间的红外带通滤光片。
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