WO2018214397A1 - 虹膜镜头 - Google Patents

虹膜镜头 Download PDF

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Publication number
WO2018214397A1
WO2018214397A1 PCT/CN2017/107846 CN2017107846W WO2018214397A1 WO 2018214397 A1 WO2018214397 A1 WO 2018214397A1 CN 2017107846 W CN2017107846 W CN 2017107846W WO 2018214397 A1 WO2018214397 A1 WO 2018214397A1
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WIPO (PCT)
Prior art keywords
lens
optical axis
iris
object side
ttl
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PCT/CN2017/107846
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English (en)
French (fr)
Inventor
黄林
Original Assignee
浙江舜宇光学有限公司
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Publication date
Priority claimed from CN201710386419.9A external-priority patent/CN106990512B/zh
Priority claimed from CN201720600534.7U external-priority patent/CN206788449U/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 US16/074,733 priority Critical patent/US11194125B2/en
Publication of WO2018214397A1 publication Critical patent/WO2018214397A1/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
    • G02B13/0035—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 three lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • 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 -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation

Definitions

  • the present invention relates to an iris lens, and more particularly to an iris lens comprising three lenses.
  • the photosensitive element of a commonly used imaging lens is generally a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor).
  • CCD Charge-Coupled Device
  • CMOS Complementary Metal-Oxide Semiconductor
  • iris lens applied to the technology not only needs to ensure a compact structure, but also needs to have high brightness and resolution to improve the recognition accuracy of the lens.
  • an iris lens having a total effective focal length f and sequentially including, from the object side to the imaging surface along the optical axis, a first lens, a second lens, and a third lens.
  • the first lens has a positive power and the object side may be a convex surface; the second lens and the third lens each have a positive power or a negative power.
  • the distance TTL of the object side of the first lens to the imaging plane on the optical axis and the total effective focal length f can satisfy 0.7 ⁇ TTL/f ⁇ 1.1.
  • an iris lens that sequentially includes, from an object side to an imaging surface along an optical axis, a first lens, a second lens, and a third lens.
  • the first lens has a positive power and the object side may be a convex surface; the second lens and the third lens each have a positive power or a negative power.
  • the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis may satisfy 1.7 ⁇ CT1/CT2 ⁇ 3.
  • an iris lens that sequentially includes, from an object side to an imaging surface along an optical axis, a first lens, a second lens, and a third lens.
  • the first lens has a positive power and the object side may be a convex surface; the second lens and the third lens each have a positive power or a negative power.
  • the distance SAG32 on the optical axis between the intersection of the image side surface of the third lens and the effective radius of the third lens image side and the center thickness CT3 of the third lens on the optical axis can satisfy 0.1 ⁇
  • the iris lens may further include an aperture stop disposed between the object side and the first lens, the aperture stop to the distance SL of the imaging surface on the optical axis and the object side of the first lens to the imaging
  • the distance TTL between the faces on the optical axis can satisfy 0.70 ⁇ SL/TTL ⁇ 1.25.
  • 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 0.8 ⁇ CT1/( CT2+CT3) ⁇ 1.3.
  • the on-axis distance TTL of the object side of the first lens to the imaging surface may be between TTL/ImgH ⁇ 2.65 between half the length ImgH of the diagonal of the effective pixel area of the electronic photosensitive element on the imaging surface.
  • the distance TTL of the object side of the first lens to the imaging plane on the optical axis and the total effective focal length f of the iris lens may satisfy 0.7 ⁇ TTL / f ⁇ 1.1.
  • the sum of the center thicknesses of the first lens to the third lens on the optical axis ⁇ CT and the distance TTL of the object side of the first lens to the imaging surface on the optical axis can satisfy ⁇ CT/TTL ⁇ 0.4.
  • a distance SAG32 on the optical axis between the intersection of the image side and the optical axis of the third lens to the effective radius apex of the third lens image side and the center thickness CT3 of the third lens on the optical axis may be Satisfy 0.1 ⁇
  • the image side of the first lens may be a concave surface, and the radius of curvature R2 of the first lens image side and the effective focal length f1 of the first lens may satisfy 1.2 ⁇ R2/f1 ⁇ 1.7.
  • the second lens may have a negative power, and -0.9 ⁇ f1/f2 ⁇ -0.2 may be satisfied between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens.
  • 1.2 ⁇ DT11 / DT22 ⁇ 1.8 may be satisfied between the effective radius DT11 of the object side of the first lens and the effective radius DT22 of the image side of the second lens.
  • the iris lens further includes an IR infrared filter disposed between the third lens and the imaging surface, the band pass band being 750 nm to 900 nm. More specifically, the band pass wavelength of the IR infrared filter may be 790 nm to 830 nm.
  • the present application uses a plurality of (for example, three) lenses, and the iris lens has compact structure, miniaturization, high brightness, high recognition accuracy, and high imaging by properly distributing the power and shape of each lens of the optical lens. At least one beneficial effect such as quality.
  • FIG. 1 is a schematic structural view of an iris lens according to Embodiment 1 of the present application.
  • 2A to 2D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Embodiment 1;
  • FIG. 3 is a schematic structural view of an iris lens according to Embodiment 2 of the present application.
  • 4A to 4D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Embodiment 2;
  • FIG. 5 is a schematic structural view of an iris lens according to Embodiment 3 of the present application.
  • 6A to 6D respectively show axial chromatic aberration curves of the iris lens of Embodiment 3, Astigmatic curve, distortion curve and magnification chromatic aberration curve;
  • FIG. 7 is a schematic structural view of an iris lens according to Embodiment 4 of the present application.
  • 8A to 8D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Embodiment 4;
  • FIG. 9 is a schematic structural view of an iris lens according to Embodiment 5 of the present application.
  • 10A to 10D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Embodiment 5;
  • FIG. 11 is a schematic structural view of an iris lens according to Embodiment 6 of the present application.
  • 12A to 12D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Embodiment 6;
  • FIG. 13 is a schematic structural view of an iris lens according to Embodiment 7 of the present application.
  • 14A to 14D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Embodiment 7;
  • FIG. 15 is a schematic structural view of an iris lens according to Embodiment 8 of the present application.
  • 16A to 16D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the iris lens of Example 8.
  • 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 or aspherical surface is not limited to the spherical or aspherical shape shown in the drawings. shape.
  • the drawings are only examples and are not to scale.
  • the paraxial region refers to a region near the optical axis.
  • the surface closest to the object in each lens is referred to as the object side
  • the surface of each lens closest to the image plane is referred to as the image side.
  • the iris lens according to an exemplary embodiment of the present application includes, for example, three lenses, that is, a first lens, a second lens, and a third lens.
  • the three lenses are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens may have a positive power
  • the object side may be a convex surface
  • the second lens has a positive power or a negative power
  • the third lens has a positive power or a negative power
  • an aperture stop STO for limiting the beam may be disposed between the object side and the first lens to improve the imaging quality of the iris lens.
  • Aperture stop STO to rainbow The on-axis distance SL of the imaging surface of the film lens and the on-axis distance TTL of the object side of the first lens to the imaging surface of the iris lens can satisfy 0.70 ⁇ SL/TTL ⁇ 1.25, and more specifically, SL and TTL can further satisfy 0.85 ⁇ SL / TTL ⁇ 1.05, in order to achieve high resolution, miniaturization, small opening at the front end.
  • the iris lens may further include a filter disposed between the third lens and the imaging surface.
  • the filter can be an IR IR filter, and the IR IR filter can be used to filter visible light noise for high performance recognition of the lens.
  • the band pass band of the filter may be from about 750 nm to about 900 nm, and more specifically, the band pass band may be from about 790 nm to about 830 nm to reduce white light interference and enhance the recognition effect of the iris lens.
  • the on-axis distance TTL of the object side of the first lens to the imaging surface of the iris lens is half the ImgH of the diagonal length of the effective pixel area on the imaging surface of the iris lens, and can satisfy TTL/ImgH ⁇ 2.65, more specifically, TTL and ImgH can further satisfy 2.50 ⁇ TTL / ImgH ⁇ 2.64 to make the structure of the iris lens compact and achieve miniaturization.
  • the on-axis distance TTL of the object side of the first lens to the imaging surface of the iris lens and the total effective focal length f of the iris lens can satisfy 0.7 ⁇ TTL / f ⁇ 1.1, and more specifically, TTL and f can further satisfy 0.88 ⁇ TTL /f ⁇ 0.94, in order to achieve a smaller focal length while ensuring a smaller focal length.
  • the sum of the center thickness sum ⁇ CT of the first lens to the third lens on the optical axis and the axial distance TTL of the object side of the first lens to the imaging surface of the iris lens can satisfy ⁇ CT/TTL ⁇ 0.4, Specifically, ⁇ CT and TTL can further satisfy 0.33 ⁇ ⁇ CT / TTL ⁇ 0.37.
  • Reasonable lens size layout is conducive to lens assembly and production processing.
  • the intersection of the image side and the optical axis of the third lens to the third lens may satisfy 0.1 ⁇
  • Reasonable configuration of the shape and power of the third lens is advantageous for improving the contrast of the lens and for controlling the incident angle of the chief ray entering the electronic photosensitive element.
  • the image side of the first lens can be concave.
  • the radius of curvature R2 of the image side of the first lens and the effective focal length f1 of the first lens may satisfy 1.2 ⁇ R2 / f1 ⁇ 1.7, and more specifically, R2 and f1 may further satisfy 1.22 ⁇ R2 / f1 ⁇ 1.58.
  • Reasonable configuration of the shape and power of the first lens is advantageous for reducing the aberration of the lens, improving the resolution and recognition accuracy.
  • the second lens can have a negative power.
  • the effective focal length f1 of the first lens and the effective focal length f2 of the second lens may satisfy -0.9 ⁇ f1/f2 ⁇ -0.2, and more specifically, f1 and f2 may further satisfy -0.89 ⁇ f1/f2 ⁇ -0.56.
  • the effective radius DT11 of the object side of the first lens and the effective radius DT22 of the image side of the second lens may satisfy 1.2 ⁇ DT11/DT22 ⁇ 1.8, and more specifically, DT11 and DT22 may further satisfy 1.47. ⁇ DT11 / DT22 ⁇ 1.56.
  • the iris lens according to the above embodiment of the present application can employ a plurality of lenses, and the lens structure can be effectively compacted by appropriately distributing the power, the surface shape, the center thickness of each lens, and the on-axis spacing between the lenses. To ensure the miniaturization of the lens, the iris lens is more advantageous for production processing and can be applied to portable electronic products.
  • at least one of the mirror faces of each lens is an aspherical mirror. Aspherical lenses are characterized by a continuous change in curvature from the center of the lens to the periphery.
  • the aspherical lens Unlike a spherical lens having a constant curvature from the center of the lens to the periphery, 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.
  • the various results and advantages described in this specification can be obtained without varying the number of lenses that make up the lens without departing from the technical solutions claimed herein.
  • the iris lens is not limited to including three lenses. If necessary, the iris The lens can also include other numbers of lenses.
  • FIG. 1 is a schematic view showing the structure of an iris lens according to Embodiment 1 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 1 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 1, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • the on-axis distance SL of the imaging plane S9 of the pupil STO to the iris lens is on the axial distance TTL from the object side surface S1 of the first lens L1 to the imaging surface S9 of the iris lens.
  • each lens is taken as an example.
  • the total length of the lens is effectively shortened, the structure is compact, the recognition accuracy is improved, and various aberrations are corrected, and the resolution of the lens is improved.
  • Imaging quality 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 above);
  • Ai is the correction coefficient of the a-th order of the aspheric surface.
  • Table 2 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for each aspherical mirror surface S1-S6 in the embodiment 1. .
  • Table 3 below shows the total effective focal length f of the iris lens of Embodiment 1, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective on the imaging surface S9.
  • the pixel area is half the length of the diagonal ImgH.
  • 0.14.
  • 2A shows an axial chromatic aberration curve of the iris lens of Embodiment 1, which indicates that light rays of different wavelengths are deviated from a focus point after passing through the iris lens.
  • 2B shows an astigmatism curve of the iris lens of Embodiment 1, which shows meridional field curvature and sagittal image plane curvature.
  • 2C shows a distortion curve of the iris lens of Embodiment 1, which shows distortion magnitude values in the case of different viewing angles.
  • 2D shows a magnification chromatic aberration curve of the iris lens of Embodiment 1, which shows a deviation of different image heights on the imaging plane after the light passes through the iris lens.
  • the iris lens given in Embodiment 1 can achieve good image quality.
  • FIG. 3 is a schematic view showing the structure of an iris lens according to Embodiment 2 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side S3 and an image side S4; and the third lens L3 has an object side S5 and an image side S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 4 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 2, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 5 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirrors S1 - S6 in the embodiment 2.
  • Table 6 shows the total effective focal length f of the iris lens of Embodiment 2, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective pixels on the imaging surface S9.
  • Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • 4A shows an axial chromatic aberration curve of the iris lens of Embodiment 2, which shows that light rays of different wavelengths are deviated from a focus point after passing through the iris lens.
  • 4B shows an astigmatism curve of the iris lens of Embodiment 2, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 4C shows a distortion curve of the iris lens of Embodiment 2, which shows distortion magnitude values in the case of different viewing angles.
  • 4D shows a magnification chromatic aberration curve of the iris lens of Embodiment 2, which shows deviations of different image heights on the imaging plane after the light passes through the iris lens.
  • the iris lens given in Embodiment 2 can achieve good image quality.
  • FIG. 5 is a schematic view showing the structure of an iris lens according to Embodiment 3 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 7 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 3, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 8 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirror faces S1 - S6 in the embodiment 3.
  • Table 9 shows the total effective focal length f of the iris lens of Embodiment 3, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective pixels on the imaging surface S9.
  • Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • Fig. 6A shows an axial chromatic aberration curve of the iris lens of Embodiment 3, which shows that light rays of different wavelengths are deviated from the focus point after passing through the iris lens.
  • Fig. 6B shows an astigmatism curve of the iris lens of Embodiment 3, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 6C shows a distortion curve of the iris lens of Embodiment 3, which shows distortion magnitude values in the case of different viewing angles.
  • 6D shows a magnification chromatic aberration curve of the iris lens of Embodiment 3, and its table Deviation of different image heights on the imaging surface after the light passes through the iris lens. 6A to 6D, the iris lens given in Embodiment 3 can achieve good image quality.
  • FIG. 7 is a schematic view showing the structure of an iris lens according to Embodiment 4 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 10 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 4, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 11 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirror faces S1 - S6 in the embodiment 4.
  • Table 12 shows the total effective focal length f of the iris lens of Example 4, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging plane S9, and the effective pixels on the imaging plane S9.
  • Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • Fig. 8B shows an astigmatism curve of the iris lens of Embodiment 4, which shows meridional field curvature and sagittal image plane curvature.
  • FIG. 8C shows a distortion curve of the iris lens of Embodiment 4, which shows distortion at different viewing angles.
  • Fig. 8D shows a magnification chromatic aberration curve of the iris lens of Embodiment 4, which shows deviations of different image heights on the imaging plane after the light rays pass through the iris lens. 8A to 8D, the iris lens given in Embodiment 4 can achieve good image quality.
  • FIG. 9 is a block diagram showing the structure of an iris lens according to Embodiment 5 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 13 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 5, in which the unit of curvature radius and thickness are both millimeters (mm).
  • Table 14 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirror faces S1 - S6 in the embodiment 5.
  • Table 15 shows the total effective focal length f of the iris lens of Example 5, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective pixels on the imaging surface S9. Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • Fig. 10A shows an axial chromatic aberration curve of the iris lens of Embodiment 5, which shows that light rays of different wavelengths are deviated from the focus point after passing through the iris lens.
  • Fig. 10B shows an astigmatism curve of the iris lens of Embodiment 5, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 10C shows a distortion curve of the iris lens of Embodiment 5, which shows distortion magnitude values in the case of different viewing angles.
  • Fig. 10D shows a magnification chromatic aberration curve of the iris lens of Embodiment 5, which shows deviations of different image heights on the imaging plane after the light rays pass through the iris lens. 10A to 10D, the iris lens given in Embodiment 5 can achieve good image quality.
  • FIG. 11 is a view showing the structure of an iris lens according to Embodiment 6 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 16 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 6, wherein the units of the radius of curvature and the thickness are each mm (mm).
  • Table 17 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirror faces S1 - S6 in the embodiment 6.
  • Table 18 shows the total effective focal length f of the iris lens of Example 6, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective pixels on the imaging surface S9.
  • Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • Fig. 12A shows an axial chromatic aberration curve of the iris lens of Example 6, which shows that the light of different wavelengths is deviated from the focus point after passing through the iris lens.
  • Fig. 12B shows an astigmatism curve of the iris lens of Example 6, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 12C shows a distortion curve of the iris lens of Embodiment 6, which shows distortion magnitude values in the case of different viewing angles.
  • Fig. 12D shows a magnification chromatic aberration curve of the iris lens of Example 6, which shows the deviation of the different image heights on the imaging plane after the light rays pass through the iris lens. 12A to 12D, the iris lens given in Embodiment 6 can achieve good image quality.
  • FIG. 13 is a view showing the structure of an iris lens according to Embodiment 7 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 19 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in 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 A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirror faces S1 - S6 in the embodiment 7.
  • Table 21 shows the total effective focal length f of the iris lens of Example 7, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective pixels on the imaging surface S9.
  • Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • Fig. 14A shows an axial chromatic aberration curve of the iris lens of Example 7, which shows that light of different wavelengths is deviated from the focus point after passing through the iris lens.
  • Fig. 14B shows an astigmatism curve of the iris lens of Embodiment 7, which shows meridional field curvature and sagittal image plane curvature.
  • Fig. 14C shows a distortion curve of the iris lens 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 iris lens of Example 7, which shows the deviation of the different image heights on the imaging plane after the light passes through the iris lens. 14A to 14D, the iris lens given in Embodiment 7 can achieve good image quality.
  • FIG. 15 is a view showing the structure of an iris lens according to Embodiment 8 of the present application.
  • the iris lens includes three lenses L1-L3 which are sequentially arranged from the object side to the image plane along the optical axis.
  • the first lens L1 has an object side surface S1 and an image side surface S2; the second lens L2 has an object side surface S3 and an image side surface S4; and the third lens L3 has an object side surface S5 and an image side surface S6.
  • the iris lens may further include a filter L4 having an object side S7 and an image side S8.
  • the filter L4 is an IR infrared filter having a band pass band of from about 750 nm to about 900 nm, and further, a band pass band of from about 790 nm to about 830 nm.
  • an aperture 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 iris lens.
  • Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the image plane S9.
  • Table 22 shows the surface type, radius of curvature, thickness, material, and conical coefficient of each lens of the iris lens in Example 8, wherein the unit of the radius of curvature and the thickness are each mm (mm).
  • Table 23 shows the high order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 and A 20 which can be used for the respective aspherical mirror faces S1 - S6 in the embodiment 8.
  • Table 24 shows the total effective focal length f of the iris lens of Example 8, the effective focal lengths f1 to f3 of the respective lenses, the on-axis distance TTL of the object side surface S1 of the first lens L1 to the imaging surface S9, and the effective pixels on the imaging surface S9. Half of the area diagonal is ImgH.
  • each aspherical surface type can be defined by the formula (1) given in the above embodiment 1.
  • Fig. 16A shows an axial chromatic aberration curve of the iris lens of Example 8, which shows that the light of different wavelengths is deviated from the focus point after passing through the iris lens.
  • FIG. 16B shows Embodiment 8 The astigmatism curve of the iris lens, which represents the meridional image curvature and the sagittal image curvature.
  • Fig. 16C shows a distortion curve of the iris lens of Embodiment 8, which shows the distortion magnitude value in the case of different viewing angles.
  • Fig. 16D shows a magnification chromatic aberration curve of the iris lens of Example 8, which shows the deviation of the different image heights on the imaging plane after the light rays pass through the iris lens. 16A to 16D, the iris lens given in Embodiment 8 can achieve good image quality.
  • Embodiments 1 to 8 respectively satisfy the relationships shown in Table 25 below.
  • the present application also provides an image pickup device whose photosensitive element 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.
  • the camera device is equipped with the iris lens described above.

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Abstract

一种虹膜镜头，具有总有效焦距f，该虹膜镜头沿光轴从物侧至成像面依序包括：第一透镜(L1)、第二透镜(L2)和第三透镜(L3)。其中，第一透镜(L1)具有正光焦度，其物侧面为凸面；第二透镜(L2)和第三透镜(L3)均具有正光焦度或负光焦度。第一透镜(L1)的物侧面至成像面在光轴上的距离TTL与总有效焦距f满足0.7<TTL/f<1.1。

Description

虹膜镜头
相关申请的交叉引用
本申请要求于2017年5月26日提交于中国国家知识产权局(SIPO)的、专利申请号为201710386419.9的中国专利申请以及于2017年5月26日提交至SIPO的、专利申请号为201720600534.7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
本发明涉及一种虹膜镜头，更具体地，本发明涉及一种包括三片透镜的虹膜镜头。
背景技术
近年来，随着科学技术的发展，便携式电子产品逐步兴起，具有摄像功能的便携式电子产品得到人们更多的青睐，因此市场对适用于便携式电子产品的摄像镜头的需求逐渐增大。目前常用的摄像镜头的感光元件一般为CCD(Charge-Coupled Device，感光耦合元件)或CMOS(Complementary Metal-Oxide Semiconductor，互补性氧化金属半导体元件)。随着半导体制程技术的精进，光学系统趋向于更高像素，芯片的像素尺寸越来越小，对相配套使用的镜头的高成像品质及小型化均提出了更高的要求。
特别是在生物识别领域，随着生物识别技术的发展，对虹膜镜头的要求也越来越高，以满足在不同产品上的应用需求。而应用在该技术上的虹膜镜头不仅需要保证结构紧凑，还需拥有较高的光亮度和解像力，以提高镜头的识别精度。
因此，需要提供一种结构紧凑、成像品质高、识别精度高的虹膜镜头。
发明内容
本申请提供的技术方案至少部分地解决了以上所述的技术问题。
根据本申请的一个方面，提供了这样一种虹膜镜头，该虹膜镜头具有总有效焦距f并且沿光轴从物侧至成像面依序包括：第一透镜、第二透镜和第三透镜。第一透镜具有正光焦度，其物侧面可为凸面；第二透镜和第三透镜均具有正光焦度或负光焦度。其中，第一透镜的物侧面至成像面在光轴上的距离TTL与总有效焦距f之间可满足0.7<TTL/f<1.1。
根据本申请的另一个方面还提供了这样一种虹膜镜头，该虹膜镜头沿光轴从物侧至成像面依序包括：第一透镜、第二透镜和第三透镜。第一透镜具有正光焦度，其物侧面可为凸面；第二透镜和第三透镜均具有正光焦度或负光焦度。其中，第一透镜于光轴上的中心厚度CT1与第二透镜于光轴上的中心厚度CT2之间可满足1.7<CT1/CT2<3。
根据本申请的另一个方面还提供了这样一种虹膜镜头，该虹膜镜头沿光轴从物侧至成像面依序包括：第一透镜、第二透镜和第三透镜。第一透镜具有正光焦度，其物侧面可为凸面；第二透镜和第三透镜均具有正光焦度或负光焦度。其中，第三透镜的像侧面和光轴的交点至第三透镜像侧面的有效半径顶点之间在光轴上的距离SAG32与第三透镜于光轴上的中心厚度CT3之间可满足0.1<|SAG32/CT3|<0.8。
在一个实施方式中，上述虹膜镜头还可包括设置在物侧与第一透镜之间的孔径光阑，该孔径光阑至成像面在光轴上的距离SL与第一透镜的物侧面至成像面在光轴上的距离TTL之间可满足0.70<SL/TTL<1.25。
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之间可满足0.8<CT1/(CT2+CT3)<1.3。
在一个实施方式中，第一透镜的物侧面至成像面的轴上距离TTL与成像面上电子感光元件有效像素区域对角线长的一半ImgH之间可满足TTL/ImgH≤2.65。
在一个实施方式中，第一透镜的物侧面至成像面在光轴上的距离TTL与虹膜镜头的总有效焦距f之间可满足0.7<TTL/f<1.1。
在一个实施方式中，第一透镜至第三透镜分别于光轴上的中心厚度之和∑CT与第一透镜的物侧面至成像面在光轴上的距离TTL之间可满足∑CT/TTL<0.4。
在一个实施方式中，第三透镜的像侧面和光轴的交点至第三透镜像侧面的有效半径顶点之间在光轴上的距离SAG32与第三透镜于光轴上的中心厚度CT3之间可满足0.1<|SAG32/CT3|<0.8。
在一个实施方式中，第一透镜的像侧面可为凹面，第一透镜像侧面的曲率半径R2与第一透镜的有效焦距f1之间可满足1.2<R2/f1<1.7。
在一个实施方式中，第二透镜可具有负光焦度，第一透镜的有效焦距f1与第二透镜的有效焦距f2之间可满足-0.9<f1/f2<-0.2。
在一个实施方式中，第一透镜的物侧面的有效半径DT11与第二透镜的像侧面的有效半径DT22之间可满足1.2<DT11/DT22<1.8。
在一个实施方式中，虹膜镜头还包括设置在第三透镜与成像面之间的IR红外滤光片，其带通波段为750nm至900nm。更具体地，IR红外滤光片的带通波段可为790nm至830nm。
本申请采用了多片(例如，三片)透镜，通过合理分配光学镜头的各镜片的光焦度及面型，使得该虹膜镜头具有结构紧凑、小型化、高光亮度、高识别精度、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，本发明的其他特征、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的虹膜镜头的结构示意图；
图2A至图2D分别示出了实施例1的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线；
图3示出了根据本申请实施例2的虹膜镜头的结构示意图；
图4A至图4D分别示出了实施例2的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线；
图5示出了根据本申请实施例3的虹膜镜头的结构示意图；
图6A至图6D分别示出了实施例3的虹膜镜头的轴上色差曲线、 象散曲线、畸变曲线以及倍率色差曲线；
图7示出了根据本申请实施例4的虹膜镜头的结构示意图；
图8A至图8D分别示出了实施例4的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线；
图9示出了根据本申请实施例5的虹膜镜头的结构示意图；
图10A至图10D分别示出了实施例5的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线；
图11示出了根据本申请实施例6的虹膜镜头的结构示意图；
图12A至图12D分别示出了实施例6的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线；
图13示出了根据本申请实施例7的虹膜镜头的结构示意图；
图14A至图14D分别示出了实施例7的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线；
图15示出了根据本申请实施例8的虹膜镜头的结构示意图；
图16A至图16D分别示出了实施例8的虹膜镜头的轴上色差曲线、象散曲线、畸变曲线以及倍率色差曲线。
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。
此外，近轴区域是指光轴附近的区域。在本文中，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、整体、步骤、操作、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、整体、步骤、操作、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“可以”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虹膜镜头包括例如三个透镜，即第一透镜、第二透镜和第三透镜。这三个透镜沿着光轴从物侧至成像面依序排列。
在示例性实施方式中，第一透镜可具有正光焦度，其物侧面可为凸面；第二透镜具有正光焦度或负光焦度；以及第三透镜具有正光焦度或负光焦度。
在一些实施方式中，可在物侧与第一透镜之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。孔径光阑STO至虹 膜镜头的成像面的轴上距离SL与第一透镜的物侧面至虹膜镜头的成像面的轴上距离TTL之间可满足0.70<SL/TTL<1.25，更具体地，SL和TTL进一步可满足0.85≤SL/TTL≤1.05，以实现高解像、小型化、前端开孔小的功效。
可选地，虹膜镜头还可包括设置在第三透镜与成像面之间的滤光片。该滤光片可为IR红外滤光片，IR红外滤光片可用于过滤可见光杂讯，从而实现镜头的高性能识别效果。该滤光片的带通波段可为约750nm至约900nm，更具体地，其带通波段可为约790nm至约830nm，以降低白光干扰，提升虹膜镜头的识别效果。
第一透镜的物侧面至虹膜镜头的成像面的轴上距离TTL与虹膜镜头的成像面上有效像素区域对角线长的一半ImgH之间可满足TTL/ImgH≤2.65，更具体地，TTL和ImgH进一步可满足2.50≤TTL/ImgH≤2.64以使得虹膜镜头的结构紧凑，实现小型化的功效。
第一透镜的物侧面至虹膜镜头的成像面的轴上距离TTL与虹膜镜头的总有效焦距f之间可满足0.7<TTL/f<1.1，更具体地，TTL和f进一步可满足0.88≤TTL/f≤0.94，以在实现小型化的同时，保证较长的焦距。
在应用中，可对各透镜的中心厚度进行合理的配置，以降低像差，提升镜头的解像力和识别精度。例如，第一透镜在光轴上的中心厚度CT1与第二透镜在光轴上的中心厚度CT2之间可满足1.7<CT1/CT2<3，更具体地，CT1和CT2进一步可满足1.91≤CT1/CT2≤2.95。又例如，第一透镜在光轴上的中心厚度CT1、第二透镜在光轴上的中心厚度CT2以及第三透镜在光轴上的中心厚度CT3之间可满足0.8<CT1/(CT2+CT3)<1.3，更具体地，CT1、CT2以及CT3进一步可满足0.89≤CT1/(CT2+CT3)≤1.26。
另外，第一透镜至第三透镜分别于光轴上的中心厚度总和∑CT与第一透镜的物侧面至虹膜镜头的成像面的轴上距离TTL之间可满足∑CT/TTL<0.4，更具体地，∑CT和TTL进一步可满足0.33≤∑CT/TTL≤0.37。合理的镜片尺寸布局，有利于镜头组立和生产加工。
在一些实施方式中，第三透镜的像侧面和光轴的交点至第三透镜 像侧面的有效半径顶点之间的轴上距离SAG32与第三透镜在光轴上的中心厚度CT3之间可满足0.1<|SAG32/CT3|<0.8，更具体地，SAG32和CT3进一步可满足0.14≤|SAG32/CT3|≤0.72。合理的配置第三透镜的形状和光焦度，有利于提升镜头相对照度并有利于控制主光线入射电子感光元件的入射角度。
在一些实施方式中，第一透镜的像侧面可为凹面。第一透镜的像侧面的曲率半径R2与第一透镜的有效焦距f1之间可满足1.2<R2/f1<1.7，更具体地，R2和f1进一步可满足1.22≤R2/f1≤1.58。合理的配置第一透镜的形状和光焦度，有利于降低镜头的像差，提升解像力和识别精度。
在一些实施方式中，第二透镜可具有负光焦度。第一透镜的有效焦距f1与第二透镜的有效焦距f2之间可满足-0.9<f1/f2<-0.2，更具体地，f1和f2进一步可满足-0.89≤f1/f2≤-0.56。通过对镜片光焦度的合理分配，可降低像差，提升解像力和识别精度。
在一些实施方式中，第一透镜的物侧面的有效半径DT11与第二透镜的像侧面的有效半径DT22之间可满足1.2<DT11/DT22<1.8，更具体地，DT11和DT22进一步可满足1.47≤DT11/DT22≤1.56。
根据本申请的上述实施方式的虹膜镜头可采用多片镜片，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，可有效紧凑镜头结构、保证镜头的小型化，从而使得虹膜镜头更有利于生产加工并且可适用于便携式电子产品。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：曲率从透镜中心到周边是连续变化的。与从透镜中心到周边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。
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三个透镜为例进行了描述，但是该虹膜镜头不限于包括三个透镜。如果需要，该虹膜 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虹膜镜头的具体实施例。
实施例1
以下参照图1至图2D描述根据本申请实施例1的虹膜镜头。图1示出了根据本申请实施例1的虹膜镜头的结构示意图。
如图1所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表1示出了实施例1中虹膜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 PCTCN2017107846-appb-000001
表1
由表1可得，光阑STO至虹膜镜头的成像面S9的轴上距离SL与第一透镜L1的物侧面S1至虹膜镜头的成像面S9的轴上距离TTL 之间满足SL/TTL＝0.87；第一透镜L1在光轴上的中心厚度CT1、第二透镜L2在光轴上的中心厚度CT2以及第三透镜L3在光轴上的中心厚度CT3之间满足CT1/(CT2+CT3)＝1.15；第一透镜L1在光轴上的中心厚度CT1与第二透镜L2在光轴上的中心厚度CT2之间满足CT1/CT2＝2.55；第一透镜L1至第三透镜L3分别于光轴上的中心厚度总和∑CT与第一透镜L1的物侧面S1至虹膜镜头的成像面S9的轴上距离TTL之间满足∑CT/TTL＝0.33。
本实施例采用了三片透镜作为示例，通过合理分配各镜片的焦距与面型，有效缩短镜头总长度，保证结构紧凑，提高识别精度；同时矫正各类像差，提高了镜头的解析度与成像品质。各非球面面型x由以下公式限定：
Figure PCTCN2017107846-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(在上表1中已给出)；Ai是非球面第i-th阶的修正系数。下表2示出了可用于实施例1中各非球面镜面S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.0254E-02 3.0138E-02 -3.1064E-02 -1.6727E-01 2.2603E+00 -8.4740E+00 1.6178E+01 -1.5686E+01 6.2594E+00
S2 1.7691E-02 -1.0452E-01 1.2123E+00 -8.7076E+00 3.8492E+01 -1.0662E+02 1.8009E+02 -1.6931E+02 6.8147E+01
S3 -8.0842E-01 7.7994E+00 -8.7707E+01 7.8480E+02 -5.2582E+03 2.3632E+04 -6.5712E+04 9.9793E+04 -6.1409E+04
S4 4.8225E-01 6.7030E-01 -1.8222E+01 2.1924E+02 -1.7178E+03 8.5381E+03 -2.5903E+04 4.3625E+04 -3.1188E+04
S5 5.5793E-02 -2.4684E-01 1.7817E+00 -7.1271E+00 1.7385E+01 -2.4781E+01 1.9027E+01 -6.2447E+00 1.8396E-01
S6 -7.1242E-02 1.1030E-01 -1.3744E+00 6.7488E+00 -1.9091E+01 3.2878E+01 -3.3786E+01 1.8989E+01 -4.4811E+00
表2
以下表3给出了实施例1的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 3.98 2.45 -3.58 -11.90 3.50 1.40
表3
根据表3可得，第一透镜L1的物侧面S1至成像面S9的轴上距离TTL与成像面S9上有效像素区域对角线长的一半ImgH之间满足TTL/ImgH＝2.50；第一透镜L1的物侧面S1至成像面S9的轴上距离TTL与虹膜镜头的总有效焦距f之间满足TTL/f＝0.88；第一透镜L1的有效焦距f1与第二透镜L2的有效焦距f2之间满足f1/f2＝3.51。结合表1和表3可得，第一透镜L1的像侧面S2的曲率半径R2与第一透镜L1的有效焦距f1之间满足R2/f1＝1.31。
另外，本实施例中第三透镜L3的像侧面S6和光轴的交点至第三透镜L3像侧面S6的有效半径顶点之间的轴上距离SAG32与第三透镜L3在光轴上的中心厚度CT3之间满足|SAG32/CT3|＝0.14；第一透镜L1的物侧面S1的有效半径DT11与第二透镜L2的像侧面S4的有效半径DT22之间可满足DT11/DT22＝1.53。
图2A示出了实施例1的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图2B示出了实施例1的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图2A至图2D可知，实施例1所给出的虹膜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4D描述了根据本申请实施例2的虹膜镜头。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的虹膜镜头的结构示意图。
如图3所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜 L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表4示出了实施例2中虹膜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S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表6示出了实施例2的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000003
表4
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.0130E-02 3.1592E-02 -5.9786E-02 5.8256E-02 1.3141E+00 -6.1681E+00 1.2893E+01 -1.3136E+01 5.4189E+00
S2 1.4527E-02 -8.1497E-02 7.9280E-01 -5.0532E+00 1.9699E+01 -4.8443E+01 7.3027E+01 -6.1545E+01 2.2386E+01
S3 -8.2320E-01 7.6169E+00 -8.2851E+01 7.2191E+02 -4.7303E+03 2.0741E+04 -5.5860E+04 8.0920E+04 -4.5940E+04
S4 4.6484E-01 6.8695E-01 -1.6727E+01 1.9414E+02 -1.4766E+03 7.1504E+03 -2.1210E+04 3.5033E+04 -2.4621E+04
S5 3.7363E-02 -1.6890E-01 1.5377E+00 -7.3089E+00 2.1522E+01 -3.8487E+01 4.0585E+01 -2.3160E+01 5.5097E+00
S6 -5.2140E-02 -1.5707E-01 7.3896E-01 -2.5958E+00 5.6549E+00 -7.3791E+00 5.5833E+00 -2.2318E+00 3.6138E-01
表5
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 3.97 2.44 -3.73 -10.64 3.50 1.40
表6
图4A示出了实施例2的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图4B示出了实施例2的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图4A至图4D可知，实施例2所给出的虹膜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6D描述了根据本申请实施例3的虹膜镜头。图5示出了根据本申请实施例3的虹膜镜头的结构示意图。
如图5所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表7示出了实施例3中虹膜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S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表9示出了实施例3的虹 膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000004
表7
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.0229E-02 3.2835E-02 -7.8157E-02 2.0314E-01 6.7879E-01 -4.5194E+00 1.0374E+01 -1.1039E+01 4.6803E+00
S2 1.4488E-02 -7.8860E-02 7.5269E-01 -4.7719E+00 1.8486E+01 -4.5306E+01 6.8136E+01 -5.7281E+01 2.0726E+01
S3 -8.4271E-01 7.9031E+00 -8.5539E+01 7.3987E+02 -4.8072E+03 2.0907E+04 -5.5820E+04 7.9951E+04 -4.4546E+04
S4 4.7174E-01 6.1824E-01 -1.5468E+01 1.8084E+02 -1.3921E+03 6.8242E+03 -2.0468E+04 3.4131E+04 -2.4183E+04
S5 4.3473E-02 -2.0655E-01 1.7419E+00 -8.1405E+00 2.3664E+01 -4.1896E+01 4.3834E+01 -2.4857E+01 5.8834E+00
S6 -4.4013E-02 -1.6813E-01 7.4294E-01 -2.5475E+00 5.4657E+00 -7.0315E+00 5.2374E+00 -2.0555E+00 3.2601E-01
表8
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 3.97 2.44 -3.76 -10.45 3.50 1.40
表9
图6A示出了实施例3的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图6B示出了实施例3的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表 示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图6A至图6D可知，实施例3所给出的虹膜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8D描述了根据本申请实施例4的虹膜镜头。图7示出了根据本申请实施例4的虹膜镜头的结构示意图。
如图7所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表10示出了实施例4中虹膜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S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表12示出了实施例4的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000005
Figure PCTCN2017107846-appb-000006
表10
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.2319E-02 3.7947E-02 -1.9381E-01 1.0504E+00 -3.2546E+00 6.3644E+00 -7.5661E+00 5.0445E+00 -1.4481E+00
S2 3.0785E-02 -2.2630E-02 1.2698E-01 -4.5658E-01 6.0715E-01 3.3300E-01 -2.4165E+00 3.1320E+00 -1.4695E+00
S3 -9.9775E-01 1.1166E+01 -1.1312E+02 8.7393E+02 -4.9069E+03 1.8679E+04 -4.5100E+04 6.1734E+04 -3.6244E+04
S4 5.4455E-01 -4.7677E-01 3.5692E+00 -3.3203E+01 1.6372E+02 -4.3542E+02 5.3015E+02 -4.6745E+01 -3.2393E+02
S5 1.5565E-01 -5.2177E-01 2.1161E+00 -6.7654E+00 1.5131E+01 -2.1955E+01 1.9517E+01 -9.6009E+00 1.9932E+00
S6 4.9992E-02 -5.6897E-01 2.0109E+00 -4.9764E+00 8.1370E+00 -8.3543E+00 5.0476E+00 -1.5656E+00 1.7394E-01
表11
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 3.94 2.53 -3.98 -14.84 3.70 1.40
表12
图8A示出了实施例4的虹膜镜头的轴上色差曲线，其表示不同
波长的光线经由虹膜镜头后的会聚焦点偏离。图8B示出了实施例4的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图8A至图8D可知，实施例4所给出的虹膜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10D描述了根据本申请实施例5的虹膜镜头。图9示出了根据本申请实施例5的虹膜镜头的结构示意图。
如图9所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本 实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表13示出了实施例5中虹膜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S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表15示出了实施例5的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000007
表13
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 6.4373E-03 1.1060E-02 1.0444E-02 -1.0068E-01 6.1096E-01 -1.6940E+00 2.5970E+00 -2.0708E+00 6.8751E-01
S2 8.5637E-03 -5.3013E-02 4.5690E-01 -2.4941E+00 8.1190E+00 -1.6155E+01 1.9035E+01 -1.2033E+01 3.1188E+00
S3 -5.4988E-01 2.5925E+00 -7.3881E+00 -8.4448E+01 1.2391E+03 -7.9092E+03 2.7989E+04 -5.2971E+04 4.1800E+04
S4 2.9879E-01 3.7091E-01 -5.6792E+00 5.5719E+01 -3.6700E+02 1.5390E+03 -3.9560E+03 5.6648E+03 -3.4498E+03
S5 -6.2743E-02 -1.7467E-01 2.1395E+00 -9.2376E+00 2.3462E+01 -3.6013E+01 3.2593E+01 -1.5920E+01 3.2208E+00
S6 -1.5806E-01 7.1017E-02 -1.6705E-01 7.1681E-01 -2.2253E+00 4.0323E+00 -4.1462E+00 2.2389E+00 -4.9156E-01
表14
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 4.08 2.67 -4.79 -9.21 3.70 1.45
表15
图10A示出了实施例5的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图10B示出了实施例5的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图10A至图10D可知，实施例5所给出的虹膜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12D描述了根据本申请实施例6的虹膜镜头。图11示出了根据本申请实施例6的虹膜镜头的结构示意图。
如图11所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表16示出了实施例6中虹膜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S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表18示出了实施例6的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000008
表16
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 8.0643E-03 -1.8880E-02 1.8767E-01 -6.0247E-01 1.0816E+00 -9.7394E-01 3.6385E-01 0.0000E+00 0.0000E+00
S2 -5.6262E-04 1.2301E-02 -1.3183E-01 3.8361E-01 -6.3266E-01 5.0336E-01 -1.4563E-01 0.0000E+00 0.0000E+00
S3 -3.4851E-01 -6.3813E-01 9.7289E+00 -1.5732E+02 1.4515E+03 -8.2568E+03 2.8087E+04 -5.2495E+04 4.1423E+04
S4 2.4799E-01 -4.1124E-01 -3.6068E+00 5.0798E+01 -3.2346E+02 1.2185E+03 -2.7690E+03 3.5081E+03 -1.9011E+03
S5 -6.2116E-02 7.8418E-02 9.8898E-02 -2.5247E-01 2.8240E-01 -2.7502E-01 1.9632E-01 -6.3552E-02 2.7381E-03
S6 -1.6758E-01 4.6590E-02 -5.5523E-02 1.8956E-01 -3.8771E-01 4.7681E-01 -3.6868E-01 1.6241E-01 -3.0356E-02
表17
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 4.08 2.63 -2.97 115.63 3.70 1.45
表18
图12A示出了实施例6的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图12B示出了实施例6的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图12A至图12D可知，实施例6所给出的虹膜镜头能够实现良好的成像品质。
实施例7
以下参照图13至图14D描述了根据本申请实施例7的虹膜镜头。图13示出了根据本申请实施例7的虹膜镜头的结构示意图。
如图13所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表19示出了实施例7中虹膜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20示出了可用于实施例7中各非球面镜面S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表21示出了实施例7的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000009
表19
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 6.9669E-03 -5.4172E-03 9.8510E-02 -3.1669E-01 5.7546E-01 -5.1187E-01 1.8913E-01 0.0000E+00 0.0000E+00
S2 -1.6236E-03 1.1014E-02 -1.3186E-01 3.8565E-01 -6.3021E-01 5.0268E-01 -1.6002E-01 0.0000E+00 0.0000E+00
S3 -3.2833E-01 -6.0600E-02 -3.6752E+00 1.0216E+01 1.6359E+02 -2.0617E+03 9.9725E+03 -2.3013E+04 2.0915E+04
S4 5.7321E-01 -2.3752E+00 7.3030E+00 -2.0133E+00 -1.3303E+02 7.5692E+02 -2.0879E+03 2.9933E+03 -1.7764E+03
S5 -6.4829E-02 7.4466E-03 5.5089E-01 -1.8560E+00 3.8020E+00 -5.0604E+00 4.0427E+00 -1.7219E+00 2.9596E-01
S6 -1.5443E-01 4.4545E-02 -1.4403E-01 5.4358E-01 -1.2133E+00 1.6117E+00 -1.2748E+00 5.4630E-01 -9.6715E-02
表20
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 4.08 2.67 -3.27 -61.48 3.70 1.45
表21
图14A示出了实施例7的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图14B示出了实施例7的虹膜镜头的象散曲线，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的虹膜镜头的畸变曲线，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的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图14A至图14D可知，实施例7所给出的虹膜镜头能够实现良好的成像品质。
实施例8
以下参照图15至图16D描述了根据本申请实施例8的虹膜镜头。图15示出了根据本申请实施例8的虹膜镜头的结构示意图。
如图15所示，虹膜镜头沿着光轴包括从物侧至成像面依序排列的三个透镜L1-L3。第一透镜L1具有物侧面S1和像侧面S2；第二透镜L2具有物侧面S3和像侧面S4；以及第三透镜L3具有物侧面S5和像侧面S6。可选地，虹膜镜头还可包括具有物侧面S7和像侧面S8的滤光片L4。滤光片L4为IR红外滤光片，其带通波段可为约750nm至约900nm，更进一步地，其带通波段可为约790nm至约830nm。在本实施例的虹膜镜头中，还可在物侧与第一透镜L1之间设置有用于限制光束的孔径光阑STO，以提高虹膜镜头的成像质量。来自物体的光依序穿过各表面S1至S8并最终成像在成像面S9上。
表22示出了实施例8中虹膜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23示出了可用于实施例8中各非球面镜面S1-S6的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。表24示出了实施例8的虹膜镜头的总有效焦距f、各透镜的有效焦距f1至f3、第一透镜L1的物侧面S1至成像面S9的轴上距离TTL以及成像面S9上有效像素区域对角线长的一半ImgH。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。
Figure PCTCN2017107846-appb-000010
表22
面号 A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 8.0611E-03 -1.8992E-02 1.8570E-01 -5.8486E-01 1.0407E+00 -9.3072E-01 3.4685E-01 0.0000E+00 0.0000E+00
S2 -2.2001E-03 1.9288E-02 -1.3183E-01 3.8266E-01 -6.2426E-01 5.1899E-01 -1.6220E-01 0.0000E+00 0.0000E+00
S3 -3.2833E-01 -6.0600E-02 -3.6752E+00 1.0216E+01 1.6359E+02 -2.0617E+03 9.9725E+03 -2.3013E+04 2.0915E+04
S4 5.7321E-01 -2.3752E+00 7.3030E+00 -2.0133E+00 -1.3303E+02 7.5692E+02 -2.0879E+03 2.9933E+03 -1.7764E+03
S5 -6.4829E-02 7.4466E-03 5.5089E-01 -1.8560E+00 3.8020E+00 -5.0604E+00 4.0427E+00 -1.7219E+00 2.9596E-01
S6 -1.5443E-01 4.4545E-02 -1.4403E-01 5.4358E-01 -1.2133E+00 1.6117E+00 -1.2748E+00 5.4630E-01 -9.6715E-02
表23
参数 f(mm) f1(mm) f2(mm) f3(mm) TTL(mm) ImgH(mm)
数值 4.07 2.75 -4.91 -10.88 3.71 1.45
表24
图16A示出了实施例8的虹膜镜头的轴上色差曲线，其表示不同波长的光线经由虹膜镜头后的会聚焦点偏离。图16B示出了实施例8 的虹膜镜头的象散曲线，其表示子午像面弯曲和弧矢像面弯曲。图16C示出了实施例8的虹膜镜头的畸变曲线，其表示不同视角情况下的畸变大小值。图16D示出了实施例8的虹膜镜头的倍率色差曲线，其表示光线经由虹膜镜头后在成像面上的不同的像高的偏差。根据图16A至图16D可知，实施例8所给出的虹膜镜头能够实现良好的成像品质。
综上，实施例1至实施例8分别满足以下表25所示的关系。
条件式\实施例 1 2 3 4 5 6 7 8
SL/TTL 0.87 0.87 0.87 0.87 0.86 0.85 0.86 1.05
CT1/(CT2+CT3) 1.15 1.11 1.12 0.89 1.26 1.05 1.01 1.14
TTL/ImgH 2.50 2.50 2.50 2.64 2.56 2.56 2.56 2.56
TTL/f 0.88 0.88 0.88 0.94 0.91 0.91 0.91 0.91
CT1/CT2 2.55 2.56 2.57 1.91 2.95 2.85 2.79 2.72
∑CT/TTL 0.33 0.33 0.33 0.37 0.34 0.36 0.36 0.33
R2/f1 1.31 1.28 1.27 1.58 1.24 1.22 1.23 1.22
|SAG32/CT3| 0.14 0.26 0.27 0.20 0.46 0.16 0.36 0.72
f1/f2 -0.68 -0.66 -0.65 -0.64 -0.56 -0.89 -0.82 -0.56
DT11/DT22 1.53 1.50 1.50 1.51 1.55 1.47 1.51 1.56
表25
本申请还提供一种摄像装置，其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虹膜镜头。
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 (36)

  1. 虹膜镜头，具有总有效焦距f，所述虹膜镜头沿光轴从物侧至成像面依序包括：第一透镜、第二透镜和第三透镜，
    其特征在于，
    所述第一透镜具有正光焦度，其物侧面为凸面；
    所述第二透镜和所述第三透镜均具有正光焦度或负光焦度；
    所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL与所述总有效焦距f满足0.7<TTL/f<1.1。
  2. 根据权利要求1所述的虹膜镜头，其特征在于，所述虹膜镜头还包括设置在物侧与所述第一透镜之间的孔径光阑，
    所述孔径光阑至所述成像面在所述光轴上的距离SL与所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL满足0.70<SL/TTL<1.25。
  3. 根据权利要求1或2所述的虹膜镜头，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0.8<CT1/(CT2+CT3)<1.3。
  4. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL与所述成像面上电子感光元件有效像素区域对角线长的一半ImgH满足TTL/ImgH≤2.65。
  5. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第一透镜于所述光轴上的中心厚度CT1与所述第二透镜于所述光轴上的中心厚度CT2满足1.7<CT1/CT2<3。
  6. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第一透镜至所述第三透镜分别于所述光轴上的中心厚度之和∑CT与所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL满足∑CT/TTL<0.4。
  7. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第三透镜的像侧面和所述光轴的交点至所述第三透镜像侧面的有效半径顶点之间在所述光轴上的距离SAG32与所述第三透镜于所述光轴上的中心厚度CT3满足0.1<|SAG32/CT3|<0.8。
  8. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第一透镜的像侧面为凹面，所述第一透镜像侧面的曲率半径R2与所述第一透镜的有效焦距f1满足1.2<R2/f1<1.7。
  9. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第二透镜具有负光焦度，所述第一透镜的有效焦距f1与所述第二透镜的有效焦距f2满足-0.9<f1/f2<-0.2。
  10. 根据权利要求1或2所述的虹膜镜头，其特征在于，所述第一透镜的物侧面的有效半径DT11与所述第二透镜的像侧面的有效半径DT22满足1.2<DT11/DT22<1.8。
  11. 根据权利要求1至10中任一项所述的虹膜镜头，其特征在于，所述虹膜镜头还包括设置在所述第三透镜与所述成像面之间的IR红外滤光片，其带通波段为750nm至900nm。
  12. 根据权利要求11所述的虹膜镜头，其特征在于，所述IR红外滤光片的带通波段为790nm至830nm。
  13. 虹膜镜头，沿光轴从物侧至成像面依序包括：第一透镜、第 二透镜和第三透镜，
    其特征在于，
    所述第一透镜具有正光焦度，其物侧面为凸面；
    所述第二透镜和所述第三透镜均具有正光焦度或负光焦度，
    所述第一透镜于所述光轴上的中心厚度CT1与所述第二透镜于所述光轴上的中心厚度CT2满足1.7<CT1/CT2<3。
  14. 根据权利要求13所述的虹膜镜头，其特征在于，所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL与所述成像面上电子感光元件有效像素区域对角线长的一半ImgH满足TTL/ImgH≤2.65。
  15. 根据权利要求14所述的虹膜镜头，具有总有效焦距f，其特征在于，所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL与所述总有效焦距f满足0.7<TTL/f<1.1。
  16. 根据权利要求14所述的虹膜镜头，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0.8<CT1/(CT2+CT3)<1.3。
  17. 根据权利要求14所述的虹膜镜头，其特征在于，所述第一透镜至所述第三透镜分别于所述光轴上的中心厚度之和∑CT与所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL满足∑CT/TTL<0.4。
  18. 根据权利要求14所述的虹膜镜头，其特征在于，所述第三透镜的像侧面和所述光轴的交点至所述第三透镜像侧面的有效半径顶点之间在所述光轴上的距离SAG32与所述第三透镜于所述光轴上的中心厚度CT3满足0.1<|SAG32/CT3|<0.8。
  19. 根据权利要求14所述的虹膜镜头，其特征在于，所述第一透镜的像侧面为凹面，所述第一透镜像侧面的曲率半径R2与所述第一透镜的有效焦距f1满足1.2<R2/f1<1.7。
  20. 根据权利要求14所述的虹膜镜头，其特征在于，所述第二透镜具有负光焦度，所述第一透镜的有效焦距f1与所述第二透镜的有效焦距f2满足-0.9<f1/f2<-0.2。
  21. 根据权利要求14所述的虹膜镜头，其特征在于，所述第一透镜的物侧面的有效半径DT11与所述第二透镜的像侧面的有效半径DT22满足1.2<DT11/DT22<1.8。
  22. 根据权利要求14所述的虹膜镜头，其特征在于，所述虹膜镜头还包括设置在所述第三透镜与所述成像面之间的IR红外滤光片，其带通波段为750nm至900nm。
  23. 根据权利要求22所述的虹膜镜头，其特征在于，所述IR红外滤光片的带通波段为790nm至830nm。
  24. 根据权利要求22所述的虹膜镜头，其特征在于，所述虹膜镜头还包括设置在物侧与所述第一透镜之间的孔径光阑，
    所述孔径光阑至所述成像面在所述光轴上的距离SL与所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL满足0.70<SL/TTL<1.25。
  25. 虹膜镜头，沿光轴从物侧至成像面依序包括：第一透镜、第二透镜和第三透镜，
    其特征在于，
    所述第一透镜具有正光焦度，其物侧面为凸面；
    所述第二透镜和所述第三透镜均具有正光焦度或负光焦度；
    所述第三透镜的像侧面和所述光轴的交点至所述第三透镜像侧面的有效半径顶点之间在所述光轴上的距离SAG32与所述第三透镜于所述光轴上的中心厚度CT3满足0.1<|SAG32/CT3|<0.8。
  26. 根据权利要求25所述的虹膜镜头，其特征在于，所述虹膜镜头还包括设置在所述第三透镜与所述成像面之间的IR红外滤光片，其带通波段为750nm至900nm。
  27. 根据权利要求26所述的虹膜镜头，其特征在于，所述IR红外滤光片的带通波段为790nm至830nm。
  28. 根据权利要求26所述的虹膜镜头，其特征在于，所述第一透镜至所述第三透镜分别于所述光轴上的中心厚度之和∑CT与所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL满足∑CT/TTL<0.4。
  29. 根据权利要求28所述的虹膜镜头，其特征在于，所述第一透镜于所述光轴上的中心厚度CT1与所述第二透镜于所述光轴上的中心厚度CT2满足1.7<CT1/CT2<3。
  30. 根据权利要求28所述的虹膜镜头，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0.8<CT1/(CT2+CT3)<1.3。
  31. 根据权利要求28所述的虹膜镜头，其特征在于，所述虹膜镜头还包括设置在物侧与所述第一透镜之间的孔径光阑，
    所述孔径光阑至所述成像面在所述光轴上的距离SL与所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL满足 0.70<SL/TTL<1.25。
  32. 根据权利要求31所述的虹膜镜头，具有总有效焦距f，其特征在于，所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL与所述总有效焦距f满足0.7<TTL/f<1.1。
  33. 根据权利要求32所述的虹膜镜头，其特征在于，所述第一透镜的物侧面至所述成像面在所述光轴上的距离TTL与所述成像面上电子感光元件有效像素区域对角线长的一半ImgH满足TTL/ImgH≤2.65。
  34. 根据权利要求32或33所述的虹膜镜头，其特征在于，所述第一透镜的像侧面为凹面，所述第一透镜像侧面的曲率半径R2与所述第一透镜的有效焦距f1满足1.2<R2/f1<1.7。
  35. 根据权利要求32或33所述的虹膜镜头，其特征在于，所述第二透镜具有负光焦度，所述第一透镜的有效焦距f1与所述第二透镜的有效焦距f2满足-0.9<f1/f2<-0.2。
  36. 根据权利要求35所述的虹膜镜头，其特征在于，所述第一透镜的物侧面的有效半径DT11与所述第二透镜的像侧面的有效半径DT22满足1.2<DT11/DT22<1.8。
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