WO2023143235A1 - 光学镜头 - Google Patents

光学镜头 Download PDF

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Publication number
WO2023143235A1
WO2023143235A1 PCT/CN2023/072560 CN2023072560W WO2023143235A1 WO 2023143235 A1 WO2023143235 A1 WO 2023143235A1 CN 2023072560 W CN2023072560 W CN 2023072560W WO 2023143235 A1 WO2023143235 A1 WO 2023143235A1
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WIPO (PCT)
Prior art keywords
lens
optical lens
optical
focal length
object side
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Application number
PCT/CN2023/072560
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English (en)
French (fr)
Inventor
陈伟建
徐宇轩
Original Assignee
江西联创电子有限公司
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Publication of WO2023143235A1 publication Critical patent/WO2023143235A1/zh

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Classifications

    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • 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
    • G02B13/0045—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 five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Definitions

  • the invention relates to the technical field of imaging lenses, in particular to an optical lens.
  • the automatic driving assistance system has developed rapidly, and the image algorithm is also being updated.
  • the on-board lens also needs to be updated to meet the needs of the current stage.
  • the information acquisition of conventional automatic driving assistance systems in a single direction is usually inseparable from telephoto lenses and wide-angle lenses.
  • the telephoto lens has a long focal length, but the field of view is small, it is generally used for capturing and observing long-distance objects; although the wide-angle lens has a large field of view, but the focal length is small, it is generally used for capturing and observing close-range objects; therefore, it is necessary to design a compatible
  • the function of telephoto lens and wide-angle lens and has a large aperture, large field of view and high resolution optical lens, to replace the traditional multiple lenses with a single function in the automatic driving assistance system.
  • the purpose of the present invention is to provide an optical lens with the advantages of large aperture, large viewing angle and high resolution.
  • the present invention provides an optical lens, comprising a total of six lenses, which sequentially include:
  • the first lens with negative power has concave surfaces on both the object side and the image side;
  • a second lens with negative refractive power the object side is concave, and the image side is convex;
  • a fourth lens with positive refractive power, its object side and image side are both convex;
  • the fifth lens with negative power has a concave surface on the object side and a convex surface on the image side;
  • the sixth lens with positive refractive power has a convex surface on the object side and a concave surface on the image side;
  • the fourth lens and the fifth lens are cemented to form a cemented lens
  • the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 0.55 ⁇ f/IH ⁇ 0.65.
  • the object-side aperture HD1 of the first lens corresponding to half of the maximum viewing angle of the optical lens and the object-side aperture D1 of the first lens corresponding to the maximum viewing angle satisfy: 0.5 ⁇ HD1/D1 ⁇ 0.6.
  • the effective focal length f of the optical lens satisfies: 5.9mm ⁇ f ⁇ 6.5mm.
  • the real image height IH corresponding to the maximum viewing angle of the optical lens satisfies: 9.5mm ⁇ IH ⁇ 10.5mm.
  • the aperture value of the optical lens is 1.7 ⁇ FNO ⁇ 1.9.
  • the effective focal length f of the optical lens and the focal length f1 of the first lens, and the object-side curvature radius R1 of the first lens object and the image-side curvature radius R2 respectively satisfy: -1.2 ⁇ f1/f ⁇ -1.0, 0.8 ⁇ (R1+R2)/(R1-R2) ⁇ 0.9.
  • the effective focal length f of the optical lens and the focal length f2 of the second lens, and the object-side curvature radius R3 of the second lens, the image-side curvature radius R4, and the second lens center thickness CT2 respectively satisfy: -18.5 ⁇ f2 /f ⁇ -11.5, 1.05 ⁇ R3/(R4+CT2) ⁇ 1.20.
  • the effective focal length f of the optical lens, the focal length f3 of the third lens, and the radius of curvature R5 of the object side of the third lens respectively satisfy: 2.0 ⁇ f3/f ⁇ 2.2, 1.10 ⁇ R5/f3 ⁇ 1.25.
  • the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.2 ⁇ f4/f ⁇ 1.9.
  • the effective focal length f of the optical lens and the focal length f5 of the fifth lens, and the object-side curvature radius R9 and the image-side curvature radius R10 of the fifth lens respectively satisfy: -2.2 ⁇ f5/f ⁇ -1.8, 1.10 ⁇ R10/(R9+f5) ⁇ 1.35.
  • the effective focal length f of the optical lens and the focal length f6 of the sixth lens, the object side curvature radius R11 and the image side curvature radius R12 of the sixth lens respectively satisfy: 2.8 ⁇ f6/f ⁇ 3.9, -3.0 ⁇ ( R11+R12)/(R11-R12) ⁇ -1.0.
  • the beneficial effect of the present invention is that the effects of large aperture, large field of view and high resolution of the optical lens are realized by rationally matching the lens shape and focal power combination between the lenses.
  • FIG. 1 is a schematic structural diagram of an optical lens according to Embodiment 1 of the present invention.
  • FIG. 2 is a field curvature graph of the optical lens in Embodiment 1 of the present invention.
  • FIG. 3 is a graph of axial aberration of the optical lens in Embodiment 1 of the present invention.
  • FIG. 4 is a vertical axis chromatic aberration graph of the optical lens in Embodiment 1 of the present invention.
  • FIG. 5 is an MTF curve diagram of the optical lens in Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural diagram of an optical lens according to Embodiment 2 of the present invention.
  • FIG. 7 is a graph of field curvature of the optical lens in Embodiment 2 of the present invention.
  • FIG. 8 is a graph of the axial aberration of the optical lens in Embodiment 2 of the present invention.
  • FIG. 9 is a vertical axis chromatic aberration graph of the optical lens in Example 2 of the present invention.
  • FIG. 10 is an MTF curve diagram of the optical lens in Example 2 of the present invention.
  • FIG. 11 is a schematic structural diagram of an optical lens according to Embodiment 3 of the present invention.
  • FIG. 12 is a field curvature graph of the optical lens in Embodiment 3 of the present invention.
  • FIG. 13 is a graph of axial aberration of the optical lens in Embodiment 3 of the present invention.
  • FIG. 14 is a vertical axis chromatic aberration graph of the optical lens in Example 3 of the present invention.
  • FIG. 15 is an MTF curve diagram of the optical lens in Embodiment 3 of the present invention.
  • FIG. 16 is a schematic structural diagram of an optical lens according to Embodiment 4 of the present invention.
  • FIG. 17 is a field curvature graph of the optical lens in Embodiment 4 of the present invention.
  • FIG. 18 is a graph of axial aberration of the optical lens in Embodiment 4 of the present invention.
  • Fig. 19 is a graph of vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.
  • FIG. 20 is an MTF curve diagram of the optical lens in Embodiment 4 of the present invention.
  • first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Accordingly, a first lens discussed hereinafter may also be referred to as a second lens or a third lens without departing from the teachings of the present invention.
  • the thickness, size and shape of lenses have been slightly exaggerated for convenience of illustration.
  • the shapes of spherical or aspheric surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspheric surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings.
  • the drawings are examples only and are not strictly drawn to scale.
  • the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is at least in the paraxial region concave.
  • the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.
  • the optical lens according to the embodiment of the present application sequentially includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side.
  • the first lens has negative optical power and is biconcave.
  • the setting of the focal power and surface shape of the first lens is conducive to collecting light with a large field of view as much as possible and entering the rear optical lens.
  • the second lens has negative optical power and has a concave-convex surface.
  • the setting of the focal power and surface shape of the second lens is conducive to collecting the light incident after passing through the first lens, so that the light trend can be smoothly transitioned, and it is beneficial to reduce the diameter of the front port of the optical lens and reduce the volume of the optical lens. It is beneficial to realize the miniaturization of the optical lens and reduce the cost.
  • the third lens has positive optical power and is biconvex.
  • the focal power and surface shape setting of the third lens is conducive to converging light and making the divergent light Smooth access to the rear for a smooth transition of light trends.
  • the fourth lens has positive optical power and is biconvex.
  • the focal power and surface shape of the fourth lens are conducive to converging the light, so that the divergent light can enter the rear smoothly, and further make the light transition smoothly.
  • the fifth lens has negative power and has a concave-convex surface.
  • the focal power and surface shape of the fifth lens play a certain role in the correction of aberrations, and help to avoid excessive divergence of the rear light.
  • the image side of the fourth mirror and the object side of the fifth mirror are glued together.
  • the fourth lens and the fifth lens are combined to form a cemented lens, which shares the overall chromatic aberration correction of the system and effectively corrects aberrations; reduces the tolerance sensitivity of the lens unit due to inclination/eccentricity during the assembly process, and improves production quality. Rate.
  • the sixth lens has positive refractive power and has a convex-concave surface.
  • the setting of the focal power and surface shape of the sixth lens is conducive to effectively transmitting more light beams to the imaging surface, correcting astigmatism and field curvature, and improving the resolution capability of the optical lens.
  • the sixth lens has an aspheric mirror surface, which is conducive to a smooth surface shape, and possibly eliminates aberrations that occur during imaging, thereby improving the imaging quality of the optical lens.
  • an aperture for limiting light beams is provided between the second lens and the fourth lens, so as to further improve the imaging quality of the optical lens.
  • the aperture is arranged between the second lens and the fourth lens, it is beneficial to condense the light entering the optical system and reduce the diameter of the front port of the optical lens.
  • the effective focal length f of the optical lens satisfies: 5.9mm ⁇ f ⁇ 6.5mm. Satisfying the above range helps to improve the ability of the lens to highlight the subject and the ability to shoot distant scenes.
  • the aperture value of the optical lens is 1.7 ⁇ FNO ⁇ 1.9. Satisfying the above range can ensure that the optical lens has both a telephoto lens and a large field of view while ensuring the illumination brightness of the edge imaging area.
  • the real image height IH corresponding to the maximum viewing angle satisfies: 9.5mm ⁇ IH ⁇ 10.5mm. Satisfying the above range is conducive to realizing the imaging effect of the large image surface of the optical lens, thereby having higher optical performance, and enabling the matching of the optical lens with image sensors of different specifications.
  • the incident angle CRA of the chief ray of the full field of view of the optical lens on the image plane satisfies: 0° ⁇ CRA ⁇ 6.5°. Satisfying the above range can make the allowable error value between the CRA of the optical lens and the CRA of the photosensitive element of the chip larger, and at the same time can ensure the illuminance of the edge imaging area.
  • the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 0.55 ⁇ f/IH ⁇ 0.65. Satisfying the above range can ensure that the optical lens has a larger imaging surface and can meet the imaging requirements of chips with large target surfaces.
  • the sum ⁇ CT of all lens center thicknesses of the optical lens and the total optical length TTL satisfy: 0.55 ⁇ CT/TTL ⁇ 0.70. Satisfying the above range is beneficial to shorten the total length of the optical lens.
  • the object-side diameter HD1 of the first lens corresponding to half of the maximum field of view of the optical lens and the object-side diameter D1 of the first lens corresponding to the maximum field of view satisfy: 0.5 ⁇ HD1/D1 ⁇ 0.6. Satisfying the above range can ensure that the central field of view of the optical lens is concentrated near the optical axis, and coma and astigmatism can be reduced as much as possible, and at the same time, the peripheral field of view can obtain greater illumination.
  • the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.2 ⁇ f1/f ⁇ -1.0. Satisfying the above range can make the first lens have a smaller negative power, which is beneficial to increase the optical back focus of the lens.
  • the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -18.5 ⁇ f2/f ⁇ -11.5. Satisfying the above-mentioned range can make the second lens have a larger negative refractive power, which is beneficial to balance the astigmatism and field curvature of the optical lens.
  • the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.0 ⁇ f3/f ⁇ 2.2. Satisfying the above range can make the third lens have a smaller positive refractive power, which is beneficial to balance various aberrations of the optical lens.
  • the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.2 ⁇ f4/f ⁇ 1.9. Satisfying the above range can make the fourth lens have a smaller positive refractive power, which is beneficial to balance various aberrations of the optical lens.
  • the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.2 ⁇ f5/f ⁇ -1.8. Satisfying the above range can make the fifth lens have a smaller negative refractive power, which is beneficial to correct the aberration caused by the front lens and avoid excessive divergence of the rear light.
  • the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.8 ⁇ f6/f ⁇ 3.9. Satisfying the above range can enable the sixth lens to have relatively large positive refractive power, which is beneficial to balance the astigmatism and field curvature of the optical lens.
  • the object-side curvature radius R1 and the image-side curvature radius R2 of the first lens of the optical lens satisfy: 0.8 ⁇ (R1+R2)/(R1-R2) ⁇ 0.9. Satisfying the above range is beneficial to increase the viewing angle of the optical lens, balance the spherical aberration and field curvature of the optical lens, and improve the imaging quality of the optical lens.
  • the object side curvature radius R3 of the second lens of the optical lens, the image side curvature radius R4 and the second lens center thickness CT2 satisfy: 1.05 ⁇ R3/(R4+CT2) ⁇ 1.20. Satisfying the above range is conducive to making the shape of the object side and the image side of the second lens close to concentric circles, and can balance the astigmatism and field curvature generated by the second lens, and improve the imaging quality of the optical lens.
  • the object-side curvature radius R5 of the third lens of the optical lens and the focal length f3 of the third lens satisfy: 1.10 ⁇ R5/f3 ⁇ 1.25. Satisfying the above range is conducive to reducing the sensitivity of the third lens, balancing various aberrations of the optical lens, and improving the imaging quality of the optical lens.
  • the curvature radius R10 of the image side of the fifth lens of the optical lens and the focal length f5 of the fifth lens satisfy: 1.10 ⁇ R10/(R9+f5) ⁇ 1.35. Satisfying the above range is beneficial to control the refraction angle of the light beam at the fifth lens, and can balance the fifth lens to produce All kinds of aberrations can improve the imaging quality of optical lens.
  • the object-side curvature radius R11 and the image-side curvature radius R12 of the sixth lens of the optical lens satisfy: -2.0 ⁇ (R11+R12)/(R11-R12) ⁇ -1.0. Satisfying the above-mentioned range makes the image side of the sixth lens tend to be gentle, which can optimize the distortion at the edge of the optical lens, balance the field curvature of the optical lens and correct astigmatism, and improve the imaging quality of the optical lens.
  • the central thickness CT3 of the third lens of the optical lens and the total optical length TTL satisfy: 0.08 ⁇ CT3/TTL ⁇ 0.26. Satisfying the above range is beneficial to achieve the purpose of correcting field curvature through a thicker third lens.
  • the central thickness CT4 of the fourth lens of the optical lens and the total optical length TTL satisfy: 0.11 ⁇ CT4/TTL ⁇ 0.16. Satisfying the above range is beneficial to achieve the purpose of correcting field curvature through a thicker fourth lens.
  • the thickness CT6 of the sixth lens center of the optical lens and the total optical length TTL satisfy: 0.11 ⁇ CT6/TTL ⁇ 0.2. Satisfying the above range is beneficial to achieve the purpose of correcting field curvature through a thicker sixth lens.
  • z is the distance between the surface and the vertex of the surface in the direction of the optical axis
  • h is the distance from the optical axis to the surface
  • c is the curvature of the vertex of the surface
  • K is the coefficient of the quadratic surface
  • A, B, C, D, E, F are respectively are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients.
  • the thickness, curvature radius, and material selection of each lens in the optical lens are different, and for specific differences, please refer to the parameter table of each embodiment.
  • the following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications that do not deviate from the innovations of the present invention, All should be regarded as equivalent replacement methods, and all are included in the protection scope of the present invention.
  • Fig. 1 shows a schematic structural view of the optical lens provided in Embodiment 1 of the present invention
  • the optical lens includes in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, and a diaphragm ST , the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the filter G1 and the cover glass G2.
  • the first lens L1 has negative refractive power, the object side S1 is concave, and the image side S2 is concave; the second lens L2 has negative refractive power, the object side S3 is concave, and the image side S4 is convex; the stop ST;
  • the third lens L3 has positive refractive power, and its object side S5 and image side S6 are both convex surfaces;
  • the fourth lens L4 has positive refractive power, and its object side S7 and image side S8 are both convex surfaces;
  • the fifth lens L5 has negative optical focus
  • the object side S9 is concave, and the image side S10 is convex;
  • the sixth lens L6 has positive refractive power, the object side S11 is convex, and the image side S12 is concave;
  • the fourth lens L4 and the fifth lens L5 can be glued together to form a cemented lens. lens.
  • the surface parameters of the aspheric lens of the optical lens in Example 1 are shown in Table 1-2.
  • the field curvature curve, axial aberration curve, vertical axis chromatic aberration curve, and MTF curve of the optical lens are shown in Figure 2, Figure 3, Figure 4, and Figure 5, respectively.
  • Fig. 2 shows the field curvature curve of embodiment 1, which represents the degree of curvature of light of different wavelengths on the meridional image plane and sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view Angle (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within ⁇ 0.03 mm, indicating that the field curvature of the optical lens is well corrected.
  • Fig. 3 shows the axial aberration curve of embodiment 1, which represents the aberration on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: millimeter), and the vertical axis represents the normalized pupil radius . It can be seen from the figure that the offset of the axial aberration is controlled within ⁇ 0.015 mm, indicating that the optical lens can effectively correct the axial aberration.
  • Fig. 4 shows the vertical axis chromatic aberration curve of embodiment 1, and it represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 microns) at different image heights on the imaging surface, and the horizontal axis represents the vertical axis chromatic aberration of each wavelength relative to the central wavelength Value (unit: micron), the vertical axis represents the normalized field of view. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ⁇ 5 microns, indicating that the optical lens can effectively correct the chromatic aberration of the peripheral field of view and the secondary spectrum of the entire image plane.
  • Fig. 5 shows the MTF curve of embodiment 1, and it represents and represents the lens imaging modulation of different spatial frequencies under each field of view, and horizontal axis represents spatial frequency (unit: lp/mm), and vertical axis table Indicates the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.5 in the entire field of view, and within the range of (0-120) lp/mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view , with better imaging quality and fine detail resolution in both low frequency and high frequency situations.
  • FIG. 6 shows a schematic structural view of the optical lens provided in Embodiment 2 of the present invention.
  • the optical lens includes in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, and a third lens. L3, stop ST, fourth lens L4, fifth lens L5, sixth lens L6, filter G1, and cover glass G2.
  • the first lens L1 has negative refractive power, its object side S1 is concave, and its image side S2 is concave; the second lens L2 has negative refractive power, its object side S3 is concave, and its image side S4 is convex; the third lens L3 It has positive refractive power, and its object side S5 and image side S6 are both convex surfaces; stop ST; the fourth lens L4 has positive refractive power, and its object side S7 and image side S8 are both convex surfaces; the fifth lens L5 has negative optical focus The object side S9 is concave, and the image side S10 is convex; the sixth lens L6 has positive refractive power, the object side S11 is convex, and the image side S12 is concave; the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens .
  • the field curvature curve, axial aberration curve, vertical axis chromatic aberration curve, and MTF curve of the optical lens are shown in FIG. 7 , FIG. 8 , FIG. 9 , and FIG. 10 , respectively.
  • Fig. 7 shows the field curvature curve of embodiment 2, which represents the bending degree of light of different wavelengths on the meridional image plane and sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view Angle (unit: °) It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ⁇ 0.04 mm, indicating that the field curvature of the optical lens is well corrected.
  • Fig. 8 shows the axial aberration curve of embodiment 2, which represents the aberration on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: millimeter), and the vertical axis represents the normalized pupil radius . It can be seen from the figure that the offset of the axial aberration is controlled within ⁇ 0.02 mm, indicating that the optical lens can effectively correct the axial aberration.
  • Fig. 9 shows the vertical axis chromatic aberration curve of embodiment 2, and it represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 microns) at different image heights on the imaging surface, and the horizontal axis represents the vertical axis chromatic aberration of each wavelength relative to the central wavelength Value (unit: micron), the vertical axis represents the normalized field of view. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ⁇ 5 microns, indicating that the optical lens can effectively correct the chromatic aberration of the peripheral field of view and the secondary spectrum of the entire image plane.
  • FIG. 10 shows the MT curve of Embodiment 2, which represents the imaging modulation degree of the lens at different spatial frequencies in each field of view, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.5 in the entire field of view, and within the range of (0-120) lp/mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view , with better imaging quality and fine detail resolution in both low frequency and high frequency situations.
  • FIG. 11 shows a schematic structural view of the optical lens provided in Embodiment 3 of the present invention.
  • the optical lens includes in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, and a third lens. L3, stop ST, fourth lens L4, fifth lens L5, sixth lens L6, filter G1, and cover glass G2.
  • the first lens L1 has negative refractive power, its object side S1 is concave, and its image side S2 is concave; the second lens L2 has negative refractive power, its object side S3 is concave, and its image side S4 is convex; the third lens L3 It has positive refractive power, and its object side S5 and image side S6 are both convex surfaces; stop ST; the fourth lens L4 has positive refractive power, and its object side S7 and image side S8 are both convex surfaces; the fifth lens L5 has negative optical focus The object side S9 is concave, and the image side S10 is convex; the sixth lens L6 has positive refractive power, the object side S11 is convex, and the image side S12 is concave; the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens .
  • the field curvature curve, axial aberration curve, vertical axis chromatic aberration curve, and MTF curve of the optical lens are shown in Figure 12, Figure 13, Figure 14, and Figure 15, respectively.
  • Fig. 12 shows the field curvature curve of embodiment 3, which represents the degree of curvature of light of different wavelengths on the meridional image plane and sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view Angle (unit: °) It can be seen from the figure that the field curvature of the meridian image plane and the sagittal image plane is controlled within ⁇ 0.03mm, indicating that the field curvature of the optical lens is well corrected.
  • Fig. 13 shows the axial aberration curve of embodiment 3, which represents the aberration on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: millimeter), and the vertical axis represents the normalized pupil radius . It can be seen from the figure that the offset of the axial aberration is controlled within ⁇ 0.02 mm, indicating that the optical lens can effectively correct the axial aberration.
  • Fig. 14 shows the vertical axis chromatic aberration curve of embodiment 3, and it represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 microns) at different image heights on the imaging surface, and the horizontal axis represents the vertical axis chromatic aberration of each wavelength relative to the central wavelength Value (unit: micron), the vertical axis represents the normalized field of view. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ⁇ 6 microns, indicating that the optical lens can effectively correct the chromatic aberration of the peripheral field of view and the secondary spectrum of the entire image plane.
  • FIG. 15 shows the MTF curve of Embodiment 3, which represents the lens imaging modulation degrees of different spatial frequencies in each field of view, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.5 in the entire field of view, and within the range of (0-120) lp/mm, the process from the center to the edge of the field of view The middle MTF curve declines evenly and smoothly, and it has better imaging quality and good detail resolution ability in both low frequency and high frequency situations.
  • FIG. 16 shows a schematic structural view of the optical lens provided in Embodiment 4 of the present invention.
  • the optical lens includes in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, and a third lens. L3, stop ST, fourth lens L4, fifth lens L5, sixth lens L6, filter G1, and cover glass G2.
  • the first lens L1 has negative refractive power, its object side S1 is concave, and its image side S2 is concave; the second lens L2 has negative refractive power, its object side S3 is concave, and its image side S4 is convex; the third lens L3 It has positive refractive power, and its object side S5 and image side S6 are both convex surfaces; stop ST; the fourth lens L4 has positive refractive power, and its object side S7 and image side S8 are both convex surfaces; the fifth lens L5 has negative optical focus The object side S9 is concave, and the image side S10 is convex; the sixth lens L6 has positive refractive power, the object side S11 is convex, and the image side S12 is concave; the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens .
  • the field curvature curve, axial aberration curve, vertical axis chromatic aberration curve, and MTF curve of the optical lens are shown in FIG. 17 , FIG. 18 , FIG. 19 , and FIG. 20 , respectively.
  • Fig. 17 shows the field curvature curve of embodiment 4, which represents the bending degree of light of different wavelengths on the meridional image plane and sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis Indicates the half field of view (unit: °). It can be seen from the figure that the field curvature of the meridian image plane and sagittal image plane is controlled within ⁇ 0.03 mm, indicating that the field curvature of the optical lens is better corrected.
  • Fig. 18 shows the axial aberration curve of embodiment 4, which represents the aberration on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: millimeter), and the vertical axis represents the normalized pupil radius . It can be seen from the figure that the offset of the axial aberration is controlled within ⁇ 0.02 mm, indicating that the optical lens can effectively correct the axial aberration.
  • Figure 19 shows the vertical axis chromatic aberration curve of embodiment 4, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 micron) at different image heights on the imaging surface, and the horizontal axis represents the vertical axis chromatic aberration of each wavelength relative to the central wavelength Value (unit: micron), the vertical axis represents the normalized field of view. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ⁇ 5 microns, indicating that the optical lens can effectively correct the chromatic aberration of the peripheral field of view and the secondary spectrum of the entire image plane.
  • FIG. 20 shows the MTF curve of Embodiment 4, which represents the lens imaging modulation degrees of different spatial frequencies in each field of view, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.5 in the entire field of view, and within the range of (0-120) lp/mm, the MTF curve decreases uniformly and smoothly from the center to the edge of the field of view , with better imaging quality and fine detail resolution in both low frequency and high frequency situations.
  • Table 5 shows the optical characteristics corresponding to the above-mentioned embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value FNO, the real image height IH and the field of view FOV and the above-mentioned embodiments.
  • the embodiment of the present invention achieves the effects of large aperture, large field of view and high resolution of the optical lens by rationally matching the lens shape and focal power combination between the lenses.

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Abstract

一种光学镜头，共六片透镜，沿光轴从物侧到成像面依次包括：具有负光焦度的第一透镜（L1），物侧面（S1）和像侧面（S2）均为凹面；具有负光焦度的第二透镜（L2），物侧面（S3）为凹面，像侧面（S4）为凸面；具有正光焦度的第三透镜（L3），物侧面（S5）和像侧面（S6）均为凸面；具有正光焦度的第四透镜（L4），物侧面（S7）和像侧面（S8）均为凸面；具有负光焦度的第五透镜（L5），物侧面（S9）为凹面，像侧面（S10）为凸面；具有正光焦度的第六透镜（L6），物侧面（S11）为凸面，像侧面（S12）为凹面；第四透镜（L4）和第五透镜（L5）胶合组成胶合透镜；光学镜头的有效焦距f与最大视场角所对应的真实像高IH满足：0.55＜f/IH＜0.65。

Description

光学镜头
相关申请的交叉引用
本申请要求于2022年01月26日提交的申请号为202210090900.4的中国申请的优先权，其在此处于所有目的通过引用将其全部内容并入本文。
技术领域
本发明涉及成像镜头的技术领域，特别涉及一种光学镜头。
背景技术
近几年，自动驾驶辅助系统飞速发展，图像算法也在更新换代，车载镜头作为自动驾驶辅助系统获取外界信息的关键部件，同样也需要推陈出新以满足现阶段的需求。
目前常规的自动驾驶辅助系统在单一方向上的信息获取通常离不开长焦镜头和广角镜头。长焦镜头虽然焦距长，但是视场范围小，普遍用于远距离物体捕捉观察；广角镜头虽然视场范围大，但是焦距小，普遍用于近距离物体捕捉观察；因此，需要设计一种能够兼容长焦镜头和广角镜头的功能，且具有大光圈、大视场角和高解像的光学镜头，以代替自动驾驶辅助系统中传统单一功能的多颗镜头。
发明内容
基于此，本发明的目的在于提出一种光学镜头，具有大光圈、大视场角和高解像的优点。
为实现上述目的，本发明的技术方案如下：
本发明提供了一种光学镜头，共六片透镜，沿光轴从物侧到成像面依次包括：
具有负光焦度的第一透镜，其物侧面和像侧面均为凹面；
具有负光焦度的第二透镜，其物侧面为凹面，像侧面为凸面；
具有正光焦度的第三透镜，其物侧面和像侧面均为凸面；
具有正光焦度的第四透镜，其物侧面和像侧面均为凸面；
具有负光焦度的第五透镜，其物侧面为凹面，像侧面为凸面；
具有正光焦度的第六透镜，其物侧面为凸面，像侧面为凹面；
所述第四透镜和所述第五透镜胶合组成胶合透镜；
所述光学镜头的有效焦距f与最大视场角所对应的真实像高IH满足：0.55＜f/IH＜0.65。
所述光学镜头的最大视场角的一半对应的第一透镜物侧面口径HD1与最大视场角对应的第一透镜物侧面口径D1满足：0.5＜HD1/D1＜0.6。
较佳地，所述光学镜头的有效焦距f满足：5.9mm＜f＜6.5mm。
较佳地，所述光学镜头的最大视场角所对应的真实像高IH满足：9.5mm＜IH＜10.5mm。
较佳地，所述光学镜头的光圈值1.7＜FNO＜1.9。
较佳地，所述光学镜头的有效焦距f与第一透镜的焦距f1，及第一透镜物的物侧面曲率半径R1与像侧面曲率半径R2分别满足：-1.2＜f1/f＜-1.0，0.8＜(R1+R2)/(R1-R2)＜0.9。
较佳地，所述光学镜头的有效焦距f与第二透镜的焦距f2，及第二透镜的物侧面曲率半径R3、像侧面曲率半径R4与第二透镜中心厚度CT2分别满足：-18.5＜f2/f＜-11.5，1.05＜R3/(R4+CT2)＜1.20。
较佳地，所述光学镜头的有效焦距f、第三透镜的焦距f3和第三透镜的物侧面曲率半径R5分别满足：2.0＜f3/f＜2.2，1.10＜R5/f3＜1.25。
较佳地，所述光学镜头的有效焦距f与第四透镜的焦距f4满足：1.2＜f4/f＜1.9。
较佳地，所述光学镜头的有效焦距f与第五透镜的焦距f5，及第五透镜的物侧面曲率半径R9与像侧面曲率半径R10分别满足：-2.2＜f5/f＜-1.8，1.10＜R10/(R9+f5)＜1.35。
较佳地，所述光学镜头的有效焦距f与第六透镜的焦距f6，第六透镜的物侧面曲率半径R11和像侧面曲率半径R12分别满足：2.8＜f6/f＜3.9，-3.0＜(R11+R12)/(R11-R12)＜-1.0。
相较于现有技术，本发明的有益效果是：通过合理的搭配各透镜之间的镜片形状与光焦度组合，实现了光学镜头的大光圈、大视场角和高解像的效果。
本发明的附加方面与优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明的上述与/或附加的方面与优点从结合下面附图对实施例的描述中将变得明显与容易理解，其中：
图1为本发明实施例1的光学镜头的结构示意图。
图2为本发明实施例1中光学镜头的场曲曲线图。
图3为本发明实施例1中光学镜头的轴向像差曲线图。
图4为本发明实施例1中光学镜头的垂轴色差曲线图。
图5为本发明实施例1中光学镜头的MTF曲线图。
图6为本发明实施例2的光学镜头的结构示意图。
图7为本发明实施例2中光学镜头的场曲曲线图。
图8为本发明实施例2中光学镜头的轴向像差曲线图。
图9为本发明实施例2中光学镜头的垂轴色差曲线图。
图10为本发明实施例2中光学镜头的MTF曲线图。
图11为本发明实施例3的光学镜头的结构示意图。
图12为本发明实施例3中光学镜头的场曲曲线图。
图13为本发明实施例3中光学镜头的轴向像差曲线图。
图14为本发明实施例3中光学镜头的垂轴色差曲线图。
图15为本发明实施例3中光学镜头的MTF曲线图。
图16为本发明实施例4的光学镜头的结构示意图。
图17为本发明实施例4中光学镜头的场曲曲线图。
图18为本发明实施例4中光学镜头的轴向像差曲线图。
图19为本发明实施例4中光学镜头的垂轴色差曲线图。
图20为本发明实施例4中光学镜头的MTF曲线图。
如下具体实施方式将结合上述附图进一步说明本发明。
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实施例的描述，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，在不背离本发明的教导的情况下，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。每个透镜最靠近被摄物体的表面称为该透镜的物侧面，每个透镜最靠近成像面的表面称为该透镜的像侧面。
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。
根据本申请实施例的光学镜头从物侧到像侧依次包括：第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜。
在一些实施例中，第一透镜具有负光焦度，且具有双凹面型。第一透镜的这种光焦度和面型设置，有利于尽可能地收集大视场光线进入后方光学镜头。
在一些实施例中，第二透镜具有负光焦度，且具有凹凸面型。第二透镜的这种光焦度和面型设置，有利于收集经过第一透镜后射入的光线，使光线走势平稳过渡，且有利于减小光学镜头前端口径，减小光学镜头体积，有利于实现光学镜头小型化，降低成本。
在一些实施例中，第三透镜具有正光焦度，且具有双凸面型。第三透镜的这种光焦度和面型设置，有利于汇聚光线，使发散后的光线 顺利进入后方，让光线走势平稳过渡。
在一些实施例中，第四透镜具有正光焦度，且具有双凸面型。第四透镜的这种光焦度和面型设置，有利于汇聚光线，使发散后的光线顺利进入后方，进一步让光线走势平稳过渡。
在一些实施例中，第五透镜具有负光焦度，且具有凹凸面型。第五透镜的这种光焦度和面型设置，对像差的矫正起到一定的作用，且有利于避免后方的光线过于发散。
在一些实施例中，第四镜的像侧面与第五镜的物侧面相互胶合。通过第四透镜和第五透镜组合成胶合透镜，分担了系统的整体色差矫正，有效矫正像差；降低透镜单元因在组立过程中产生的倾斜/偏芯等公差敏感度问题，提高生产良率。
在一些实施例中，第六透镜具有正光焦度，且具有凸凹面型。第六透镜的这种光焦度和面型设置，有利于将更多的光束有效地传递至成像面，并且矫正像散和场曲，提高光学镜头的解像能力。第六透镜具有非球面镜面，有利于面型平缓，可能地消除在成像的时候出现的像差，从而提升光学镜头的成像质量。
在一些实施例中，第二透镜与第四透镜之间设置用于限制光束的光阑，以进一步提高光学镜头的成像质量。当光阑设置于第二透镜与第四透镜之间时，有利于收束进入光学系统的光线，减小光学镜头前端口径。
在一些实施例中，光学镜头的有效焦距f满足：5.9mm＜f＜6.5mm。满足上述范围，有助于提升镜头凸显主体的能力以及拍摄远处景物的能力。
在一些实施例中，光学镜头的光圈值1.7＜FNO＜1.9。满足上述范围，可以保证光学镜头在兼具长焦和大视场角的同时保证边缘成像区域的光照亮度。
在一些实施例中，最大视场角所对应的真实像高IH满足：9.5mm＜IH＜10.5mm。满足上述范围，有利于实现光学镜头大像面的成像效果，进而拥有较高的光学性能，并且能够实现光学镜头与不同规格的图像传感器相匹配。
在一些实施例中，光学镜头的全视场主光线在像面上入射角CRA满足：0°＜CRA＜6.5°。满足上述范围，可以使光学镜头的CRA与芯片感光元件的CRA之间的容许误差数值较大，同时能够保证边缘成像区域的照度。
在一些实施例中，光学镜头的有效焦距f与最大视场角所对应的真实像高IH满足：0.55＜f/IH＜0.65。满足上述范围，可以保证光学镜头具有较大的成像面，能满足大靶面芯片的成像需求。
在一些实施例中，光学镜头的所有透镜中心厚度之和ΣCT与光学总长TTL满足：0.55＜ΣCT/TTL＜0.70。满足上述范围，有利于缩短光学镜头的总长。
在一些实施例中，光学镜头的最大视场角的一半对应的第一透镜物侧面口径HD1与最大视场角对应的第一透镜物侧面口径D1满足：0.5＜HD1/D1＜0.6。满足上述范围，可以保证光学镜头的中心视场集中在光轴附近，能够尽可能的减少彗差和像散，同时边缘视场能够取得更大的照度。
在一些实施例中，光学镜头的有效焦距f与第一透镜的焦距f1满足：-1.2＜f1/f＜-1.0。满足上述范围，可以使第一透镜具有较小的负光焦度，有利于增大镜头的光学后焦。
在一些实施例中，光学镜头的有效焦距f与第二透镜的焦距f2满足：-18.5＜f2/f＜-11.5。满足上述范围，可以使第二透镜具有较大的负光焦度，有利于平衡光学镜头的像散和场曲。
在一些实施例中，光学镜头的有效焦距f与第三透镜的焦距f3满足：2.0＜f3/f＜2.2。满足上述范围，可以使第三透镜具有较小的正光焦度，有利于平衡光学镜头的各类像差。
在一些实施例中，光学镜头的有效焦距f与第四透镜的焦距f4满足：1.2＜f4/f＜1.9。满足上述范围，可以使第四透镜具有较小的正光焦度，有利于平衡光学镜头的各类像差。
在一些实施例中，光学镜头的有效焦距f与第五透镜的焦距f5满足：-2.2＜f5/f＜-1.8。满足上述范围，可以使第五透镜具有较小的负光焦度，有利于矫正前端透镜导致像差，并且避免后方的光线过于发散。
在一些实施例中，光学镜头的有效焦距f与第六透镜的焦距f6满足：2.8＜f6/f＜3.9。满足上述范围，可以使第六透镜具有较大的正光焦度，有利于平衡光学镜头的像散和场曲。
在一些实施例中，光学镜头的第一透镜的物侧面曲率半径R1和像侧面曲率半径R2满足：0.8＜(R1+R2)/(R1-R2)＜0.9。满足上述范围，有利于增大光学镜头的视场角，平衡光学镜头的球差和场曲，提高光学镜头的成像质量。
在一些实施例中，光学镜头的第二透镜的物侧面曲率半径R3、像侧面曲率半径R4和第二透镜中心厚度CT2满足：1.05＜R3/(R4+CT2)＜1.20。满足上述范围，有利于使第二透镜物侧面和像侧面的形状接近同心圆，并且能够平衡第二透镜产生的像散和场曲，提高光学镜头的成像质量。
在一些实施例中，光学镜头的第三透镜的物侧面曲率半径R5和第三透镜的焦距f3满足：1.10＜R5/f3＜1.25。满足上述范围，有利于降低第三透镜的敏感度，平衡光学镜头的各类像差，提高光学镜头成像质量。
在一些实施例中，光学镜头的第五透镜的像侧面曲率半径R10和第五透镜的焦距f5满足：1.10＜R10/(R9+f5)＜1.35。满足上述范围，有利于控制光束在第五透镜的折射角度，并且能够平衡第五透镜产生 的各类像差，提高光学镜头成像质量。
在一些实施例中，光学镜头的第六透镜的物侧面曲率半径R11和像侧面曲率半径R12满足：-2.0＜(R11+R12)/(R11-R12)＜-1.0。满足上述范围，使得第六透镜像侧面趋于平缓，能够优化光学镜头边缘处的畸变，同时平衡光学镜头的场曲并矫正像散，提高光学镜头成像质量。
在一些实施例中，光学镜头的第三透镜中心厚度CT3与光学总长TTL满足：0.08≤CT3/TTL≤0.26。满足上述范围，有利于通过较厚的第三透镜实现矫正场曲的目的。
在一些实施例中，光学镜头的第四透镜中心厚度CT4与光学总长TTL满足：0.11≤CT4/TTL≤0.16。满足上述范围，有利于通过较厚的第四透镜实现矫正场曲的目的。
在一些实施例中，光学镜头的第六透镜中心厚度CT6与光学总长TTL满足：0.11≤CT6/TTL≤0.2。满足上述范围，有利于通过较厚的第六透镜实现矫正场曲的目的。
为使系统具有更好的光学性能，镜头中采用多片非球面透镜，所述光学镜头的各非球面表面形状满足下列方程：
其中，z为曲面与曲面顶点在光轴方向的距离，h为光轴到曲面的距离，c为曲面顶点的曲率，K为二次曲面系数，A、B、C、D、E、F分别为二阶、四阶、六阶、八阶、十阶、十二阶曲面系数。
下面分多个实施例对本发明进行进一步的说明。在各个实施例中，光学镜头中的各个透镜的厚度、曲率半径、材料选择部分有所不同，具体不同可参见各实施例的参数表。下述实施例仅为本发明的较佳实施方式，但本发明的实施方式并不仅仅受下述实施例的限制，其他的任何未背离本发明创新点所作的改变、替代、组合或简化，都应视为等效的置换方式，都包含在本发明的保护范围之内。
实施例1
请参阅图1，所示为本发明实施例1中提供的光学镜头的结构示意图，该光学镜头沿光轴从物侧到成像面依次包括：第一透镜L1、第二透镜L2、光阑ST、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6、滤光片G1以及保护玻璃G2。
第一透镜L1具有负光焦度，其物侧面S1为凹面、像侧面S2为凹面；第二透镜L2具有负光焦度，其物侧面S3为凹面、像侧面S4为凸面；光阑ST；第三透镜L3具有正光焦度，其物侧面S5和像侧面S6均为凸面；第四透镜L4具有正光焦度，其物侧面S7和像侧面S8均为凸面；第五透镜L5具有负光焦度，其物侧面S9为凹面，像侧面S10为凸面；第六透镜L6具有正光焦度，其物侧面S11为凸面、像侧面S12为凹面；第四透镜L4和第五透镜L5可胶合组成胶合透镜。
实施例1中的光学镜头中各透镜的相关参数如表1-1所示。
表1-1
实施例1中的光学镜头的非球面透镜的面型参数如表1-2所示。
表1-2
在本实施例中，光学镜头的场曲曲线图、轴向像差曲线图、垂轴色差曲线图、MTF曲线图分别如图2、图3、图4、图5所示。
图2示出了实施例1的场曲曲线，其表示不同波长的光线在子午像面和弧矢像面的弯曲程度，横轴表示偏移量(单位：毫米)，纵轴表示半视场角(单位：°)。从图中可以看出，子午像面和弧矢像面的场曲控制在±0.03毫米以内，说明光学镜头的场曲得到较好的矫正。
图3示出了实施例1的轴向像差曲线，其表示成像面处光轴上的像差，横轴表示轴向像差值(单位：毫米)，纵轴表示归一化光瞳半径。从图中可以看出，轴向像差的偏移量控制在±0.015毫米以内，说明光学镜头能够有效地矫正轴向像差。
图4示出了实施例1的垂轴色差曲线，其表示各波长相对于中心波长(0.55微米)在成像面上不同像高处的色差，横轴表示各波长相对中心波长的垂轴色差值(单位：微米)，纵轴表示归一化视场角。从图中可以看出，最长波长和最短波长的垂轴色差控制在±5微米以内，说明该光学镜头能够有效矫正边缘视场的色差以及整个像面的二级光谱。
图5示出了实施例1的MTF曲线，其表示表示各视场下不同空间频率的镜头成像调制度，横轴表示空间频率(单位：lp/mm)，纵轴表 示MTF值。从图中可以看出，本实施例的MTF值在全视场内均在0.5以上，在(0～120)lp/mm的范围内，从中心至边缘视场的过程中MTF曲线均匀平滑下降，在低频和高频情况下都具有较佳的成像品质和良好的细节分辨能力。
实施例2
请参阅图6，所示为本发明实施例2中提供的光学镜头的结构示意图，该光学镜头沿光轴从物侧到成像面依次包括：第一透镜L1、第二透镜L2、第三透镜L3、光阑ST、第四透镜L4、第五透镜L5、第六透镜L6、滤光片G1以及保护玻璃G2。
第一透镜L1具有负光焦度，其物侧面S1为凹面、像侧面S2为凹面；第二透镜L2具有负光焦度，其物侧面S3为凹面、像侧面S4为凸面；第三透镜L3具有正光焦度，其物侧面S5和像侧面S6均为凸面；光阑ST；第四透镜L4具有正光焦度，其物侧面S7和像侧面S8均为凸面；第五透镜L5具有负光焦度，其物侧面S9为凹面，像侧面S10为凸面；第六透镜L6具有正光焦度，其物侧面S11为凸面、像侧面S12为凹面；第四透镜L4和第五透镜L5胶合组成胶合透镜。
实施例2中的光学镜头中各透镜的相关参数如表2-1所示。
表2-1
实施例2中的光学镜头的非球面透镜的面型参数如表2-2所示。
表2-2
在本实施例中，光学镜头的场曲曲线图、轴向像差曲线图、垂轴色差曲线图、MTF曲线图分别如图7、图8、图9、图10所示。
图7示出了实施例2的场曲曲线，其表示不同波长的光线在子午像面和弧矢像面的弯曲程度，横轴表示偏移量(单位：毫米)，纵轴表示半视场角(单位：°)从图中可以看出，子午像面和弧矢像面的场曲控制在±0.04毫米以内，说明光学镜头的场曲得到较好的矫正。
图8示出了实施例2的轴向像差曲线，其表示成像面处光轴上的像差，横轴表示轴向像差值(单位：毫米)，纵轴表示归一化光瞳半径。从图中可以看出，轴向像差的偏移量控制在±0.02毫米以内，说明光学镜头能够有效地矫正轴向像差。
图9示出了实施例2的垂轴色差曲线，其表示各波长相对于中心波长(0.55微米)在成像面上不同像高处的色差，横轴表示各波长相对中心波长的垂轴色差值(单位：微米)，纵轴表示归一化视场角。从图中可以看出，最长波长和最短波长的垂轴色差控制在±5微米以内，说明该光学镜头能够有效矫正边缘视场的色差以及整个像面的二级光谱。
图10示出了实施例2的MT曲线，其表示表示各视场下不同空间频率的镜头成像调制度，横轴表示空间频率(单位：lp/mm)，纵轴表示MTF值。从图中可以看出，本实施例的MTF值在全视场内均在0.5以上，在(0～120)lp/mm的范围内，从中心至边缘视场的过程中MTF曲线均匀平滑下降，在低频和高频情况下都具有较佳的成像品质和良好的细节分辨能力。
实施例3
请参阅图11，所示为本发明实施例3中提供的光学镜头的结构示意图，该光学镜头沿光轴从物侧到成像面依次包括：第一透镜L1、第二透镜L2、第三透镜L3、光阑ST、第四透镜L4、第五透镜L5、第六透镜L6、滤光片G1以及保护玻璃G2。
第一透镜L1具有负光焦度，其物侧面S1为凹面、像侧面S2为凹面；第二透镜L2具有负光焦度，其物侧面S3为凹面、像侧面S4为凸面；第三透镜L3具有正光焦度，其物侧面S5和像侧面S6均为凸面；光阑ST；第四透镜L4具有正光焦度，其物侧面S7和像侧面S8均为凸面；第五透镜L5具有负光焦度，其物侧面S9为凹面，像侧面S10为凸面；第六透镜L6具有正光焦度，其物侧面S11为凸面、像侧面S12为凹面；第四透镜L4和第五透镜L5胶合组成胶合透镜。
实施例3中的光学镜头中各透镜的相关参数如表3-1所示。
表3-1
实施例3中的光学镜头的非球面透镜的面型参数如表3-2所示。
表3-2
在本实施例中，光学镜头的场曲曲线图、轴向像差曲线图、垂轴色差曲线图、MTF曲线图分别如图12、图13、图14、图15所示。
图12示出了实施例3的场曲曲线，其表示不同波长的光线在子午像面和弧矢像面的弯曲程度，横轴表示偏移量(单位：毫米)，纵轴表示半视场角(单位：°)从图中可以看出，子午像面和弧矢像面的场曲控制在±0.03毫米以内，说明光学镜头的场曲得到较好的矫正。
图13示出了实施例3的轴向像差曲线，其表示成像面处光轴上的像差，横轴表示轴向像差值(单位：毫米)，纵轴表示归一化光瞳半径。从图中可以看出，轴向像差的偏移量控制在±0.02毫米以内，说明光学镜头能够有效地矫正轴向像差。
图14示出了实施例3的垂轴色差曲线，其表示各波长相对于中心波长(0.55微米)在成像面上不同像高处的色差，横轴表示各波长相对中心波长的垂轴色差值(单位：微米)，纵轴表示归一化视场角。从图中可以看出，最长波长和最短波长的垂轴色差控制在±6微米以内，说明该光学镜头能够有效矫正边缘视场的色差以及整个像面的二级光谱。
图15示出了实施例3的MTF曲线，其表示表示各视场下不同空间频率的镜头成像调制度，横轴表示空间频率(单位：lp/mm)，纵轴表示MTF值。从图中可以看出，本实施例的MTF值在全视场内均在0.5以上，在(0～120)lp/mm的范围内，从中心至边缘视场的过程 中MTF曲线均匀平滑下降，在低频和高频情况下都具有较佳的成像品质和良好的细节分辨能力。
实施例4
请参阅图16，所示为本发明实施例4中提供的光学镜头的结构示意图，该光学镜头沿光轴从物侧到成像面依次包括：第一透镜L1、第二透镜L2、第三透镜L3、光阑ST、第四透镜L4、第五透镜L5、第六透镜L6、滤光片G1以及保护玻璃G2。
第一透镜L1具有负光焦度，其物侧面S1为凹面、像侧面S2为凹面；第二透镜L2具有负光焦度，其物侧面S3为凹面、像侧面S4为凸面；第三透镜L3具有正光焦度，其物侧面S5和像侧面S6均为凸面；光阑ST；第四透镜L4具有正光焦度，其物侧面S7和像侧面S8均为凸面；第五透镜L5具有负光焦度，其物侧面S9为凹面，像侧面S10为凸面；第六透镜L6具有正光焦度，其物侧面S11为凸面、像侧面S12为凹面；第四透镜L4和第五透镜L5胶合组成胶合透镜。
实施例4中的光学镜头中各透镜的相关参数如表4-1所示。
表4-1
实施例4中的光学镜头的非球面透镜的面型参数如表4-2所示。
表4-2
在本实施例中，光学镜头的场曲曲线图、轴向像差曲线图、垂轴色差曲线图、MTF曲线图分别如图17、图18、图19、图20所示。
图17示出了实施例4的场曲曲线，其表示不同波长的光线在子午像面和弧矢像面的弯曲程度，横轴表示偏移量(单位：毫米)，纵轴 表示半视场角(单位：°)从图中可以看出，子午像面和弧矢像面的场曲控制在±0.03毫米以内，说明光学镜头的场曲得到较好的矫正。
图18示出了实施例4的轴向像差曲线，其表示成像面处光轴上的像差，横轴表示轴向像差值(单位：毫米)，纵轴表示归一化光瞳半径。从图中可以看出，轴向像差的偏移量控制在±0.02毫米以内，说明光学镜头能够有效地矫正轴向像差。
图19示出了实施例4的垂轴色差曲线，其表示各波长相对于中心波长(0.55微米)在成像面上不同像高处的色差，横轴表示各波长相对中心波长的垂轴色差值(单位：微米)，纵轴表示归一化视场角。从图中可以看出，最长波长和最短波长的垂轴色差控制在±5微米以内，说明该光学镜头能够有效矫正边缘视场的色差以及整个像面的二级光谱。
图20示出了实施例4的MTF曲线，其表示表示各视场下不同空间频率的镜头成像调制度，横轴表示空间频率(单位：lp/mm)，纵轴表示MTF值。从图中可以看出，本实施例的MTF值在全视场内均在0.5以上，在(0～120)lp/mm的范围内，从中心至边缘视场的过程中MTF曲线均匀平滑下降，在低频和高频情况下都具有较佳的成像品质和良好的细节分辨能力。
请参阅表5，所示为上述各实施例对应的光学特性，包括所述光学镜头的有效焦距f、光学总长TTL、光圈值FNO、真实像高IH以及视场角FOV以及与所述实施例中每个条件式对应的数值。
表5
综上所述，本发明实施例通过合理的搭配各透镜之间的镜片形状与光焦度组合，实现了光学镜头的大光圈、大视场角和高解像的效果。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体与详细，但并不能因此而理解为对本发明范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形与改进，这些都属于本发明的保护范围。因此，本发明的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种光学镜头，共六片透镜，其特征在于，沿光轴从物侧到成像面依次包括：
    具有负光焦度的第一透镜，其物侧面和像侧面均为凹面；
    具有负光焦度的第二透镜，其物侧面为凹面，像侧面为凸面；
    具有正光焦度的第三透镜，其物侧面和像侧面均为凸面；
    具有正光焦度的第四透镜，其物侧面和像侧面均为凸面；
    具有负光焦度的第五透镜，其物侧面为凹面，像侧面为凸面；
    具有正光焦度的第六透镜，其物侧面为凸面，像侧面为凹面；
    所述第四透镜和所述第五透镜胶合组成胶合透镜；
    所述光学镜头的有效焦距f与最大视场角所对应的真实像高IH满足：0.55＜f/IH＜0.65；
    所述光学镜头的最大视场角的一半对应的第一透镜物侧面口径HD1与最大视场角对应的第一透镜物侧面口径D1满足：0.5＜HD1/D1＜0.6。
  2. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f满足：5.9mm＜f＜6.5mm。
  3. 根据权利要求1所述的光学镜头，其特征在于，其特征在于，所述光学镜头的最大视场角所对应的真实像高IH满足：9.5mm＜IH＜10.5mm。
  4. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的光圈值1.7＜FNO＜1.9。
  5. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f与第一透镜的焦距f1，及第一透镜物的物侧面曲率半径R1与像侧面曲率半径R2分别满足：-1.2＜f1/f＜-1.0，0.8＜(R1+R2)/(R1-R2)＜0.9。
  6. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f与第二透镜的焦距f2，及第二透镜的物侧面曲率半径R3、像侧面曲率半径R4与第二透镜中心厚度CT2分别满足：-18.5＜f2/f＜-11.5，1.05＜R3/(R4+CT2)＜1.20。
  7. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f、第三透镜的焦距f3和第三透镜的物侧面曲率半径R5分别满足：2.0＜f3/f＜2.2，1.10＜R5/f3＜1.25。
  8. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f与第四透镜的焦距f4满足：1.2＜f4/f＜1.9。
  9. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f与第五透镜的焦距f5，及第五透镜的物侧面曲率半径R9与像侧面曲率半径R10分别满足：-2.2＜f5/f＜-1.8，1.10＜R10/(R9+f5)＜1.35。
  10. 根据权利要求1所述的光学镜头，其特征在于，所述光学镜头的有效焦距f与第六透镜的焦距f6，第六透镜的物侧面曲率半径R11和像侧面曲率半径R12分别满足：2.8＜f6/f＜3.9，-3.0＜(R11+R12)/(R11-R12)＜-1.0。
PCT/CN2023/072560 2022-01-26 2023-01-17 光学镜头 WO2023143235A1 (zh)

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