WO2020259696A1 - 光学镜头组、摄像头及终端设备 - Google Patents

光学镜头组、摄像头及终端设备 Download PDF

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Publication number
WO2020259696A1
WO2020259696A1 PCT/CN2020/098601 CN2020098601W WO2020259696A1 WO 2020259696 A1 WO2020259696 A1 WO 2020259696A1 CN 2020098601 W CN2020098601 W CN 2020098601W WO 2020259696 A1 WO2020259696 A1 WO 2020259696A1
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WIPO (PCT)
Prior art keywords
lens
optical
object side
lenses
temperature drift
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PCT/CN2020/098601
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English (en)
French (fr)
Inventor
江依达
叶海水
葛洪
卢建龙
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华为技术有限公司
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Priority to EP20831950.9A priority Critical patent/EP3964874A4/en
Publication of WO2020259696A1 publication Critical patent/WO2020259696A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
    • 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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • 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
    • G02B27/005—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 for correction of secondary colour or higher-order chromatic aberrations
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation

Definitions

  • the invention belongs to the technical field of optical imaging, and in particular relates to a telephoto lens group and terminal equipment of a photographic optical system.
  • Portable terminal equipment is more and more widely used, and the camera is a typical terminal equipment component.
  • the camera is a typical terminal equipment component.
  • camera applications have become increasingly diverse.
  • the telephoto lens group has become the development trend of the camera head of the terminal equipment.
  • the telephoto lens group of the terminal equipment is designed with 4-6 pieces of plastic lens structure.
  • the effective focal length and back focus of the optical lens group change with temperature, which is called the temperature drift effect.
  • the temperature drift effect of the lens group becomes more obvious. The temperature drift effect has seriously affected the user experience.
  • This application provides an optical lens group, a camera, and terminal equipment.
  • the optical lens group is a telephoto lens.
  • the material of the lens is defined and the refractive power of the first three lenses on the near object side is defined, combined with the light of the remaining lenses.
  • the focal power solves the problem of temperature drift effect, can improve the imaging effect, and provide users with a good experience.
  • an embodiment of the present invention provides an optical lens assembly, including a plurality of lenses arranged in sequence from the object side to the image side along the optical axis direction, and the number of lenses can be four, five, or six. One or seven and so on.
  • At least one lens of the plurality of lenses is made of a first material, the relative refractive index temperature drift coefficient of the first material is smaller than the relative refractive index temperature drift coefficient of the plastic material, the first material may be glass material, and other lenses The material is plastic.
  • the first three lenses in the direction from the object side to the image side are the first lens, the second lens, and the third lens in order.
  • the first lens has positive refractive power
  • the second lens has negative power.
  • the third lens has a positive optical power
  • the effective focal length of the optical lens group is f
  • the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, TTL/ f ⁇ 0.96.
  • the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, which specifically refers to the distance between the intersection of the object side surface of the first lens and the optical axis and the intersection of the imaging surface and the optical axis.
  • the material of at least one lens is defined as the first material whose relative refractive index temperature drift coefficient is smaller than the relative refractive index temperature drift coefficient of the plastic material, combined with the optical focus of the first lens, the second lens, the third lens, and other lenses.
  • the limitation of the degree can suppress the temperature drift effect of the optical lens group and solve the comprehensive chromatic aberration problem. Even in a high temperature environment, the imaging effect of the optical lens group can be guaranteed, and a shorter total length of the optical lens group can be obtained.
  • the relative refractive index temperature drift coefficient of the first material is ⁇ (representing the coefficient of change of the refractive index of the material in a medium such as air with temperature), -9 ⁇ 10 -5 ⁇ ⁇ ⁇ 9 ⁇ 10 -5 .
  • ⁇ representing the coefficient of change of the refractive index of the material in a medium such as air with temperature
  • -9 ⁇ 10 -5 ⁇ ⁇ ⁇ 9 ⁇ 10 -5 by limiting the range of the relative refractive index temperature drift coefficient of the first material and the distribution of the optical power, for the optical lens group, a small system temperature drift coefficient can be obtained.
  • the relative refractive index temperature drift coefficient of the first material is ⁇ , -9 ⁇ 10 -5 ⁇ ⁇ ⁇ 0.
  • the relative refractive index temperature drift coefficient of the first material is selected as a negative value, which can be a plastic material
  • the relative refractive index temperature drift coefficient of the plastic lens is a positive value.
  • the temperature drift coefficient of the optical lens group is ⁇ f/ ⁇ °C, -2.6um/°C ⁇ f/ ⁇ °C ⁇ 2.6um/°C, which is beneficial to suppress the temperature of the optical lens group. Drift effect.
  • the temperature drift coefficient is limited to the range, which can ensure that the optical lens set meets the use requirements.
  • the temperature drift coefficient range can be specifically -1um/°C ⁇ f/ ⁇ °C ⁇ 1um/°C . The smaller the absolute value of the temperature drift coefficient ⁇ f/ ⁇ °C of the optical lens group, the better the imaging effect.
  • the radius of curvature of the object side surface of the second lens is R21
  • the radius of curvature of the image side surface of the second lens is R22, which satisfies the condition:
  • is greater than or equal to 10, it is not conducive to correcting the overall aberration of the optical lens group and will affect the imaging effect.
  • the thickness is distributed according to the density of the lens material, so that the weight of the telephoto lens group is uniform before and after, and the center of gravity is located near the center of the optical lens group, ensuring a stable posture of the optical lens group.
  • the center of gravity of the optical lens group is located at the center of the optical lens group.
  • the center position of the optical lens group refers to the intersection of the object side of the first lens and the optical axis to the intersection of the image side of the last lens and the optical axis. This application does not limit the center position as the midpoint position. It can be within the range near the midpoint position, as long as it can ensure that when all the lenses are assembled in the lens barrel of the camera, the front and rear weight of the camera is uniform.
  • At least one of the lenses is made of the first material, such as glass, and the rest of the lenses are made of plastic.
  • the lens of the first material is heavier than the other lenses and is prone to deflection of the center of gravity.
  • the voice coil motor drives the camera to achieve anti-shake
  • the position of the center of gravity is defined to make the posture of the optical lens group stable, so that the problem of camera anti-shake is easier to solve during use.
  • the number of the plurality of lenses is six, which are the first lens, the second lens, and the third lens arranged in sequence from the object side to the image side.
  • the fourth lens, the fifth lens and the sixth lens, the optical lens group further includes a vignetting diaphragm, the vignetting diaphragm is arranged on the object side of the first lens and/or arranged on the sixth lens On the image side of the lens, the vignetting diaphragm can intercept imaging rays with large aberrations (also referred to as intercepting off-axis point beams), improve imaging quality, and help reduce the outer diameter of the optical lens group.
  • the dispersion coefficient (Abbe number) of the lens with the first material is V, which satisfies the condition: 15 ⁇ V ⁇ 100.
  • the chromatic aberration of the optical lens group can be corrected through reasonable power distribution and the selection of the dispersion coefficient, and an imaging effect with better definition can be obtained.
  • Dispersion coefficient is an important index to measure the sharpness of lens imaging, usually expressed by Abbe number (dispersion coefficient). The larger the Abbe number, the smaller the dispersion, on the contrary, the smaller the Abbe number, the greater the dispersion, and the worse the sharpness of its imaging. That is to characterize the separation effect of a certain material on the light source (light wave spectrum line).
  • the ideal lens is a beam of parallel white light that passes through and focuses on a point.
  • the material shows different refractive indexes for different light wave wavelengths, it produces light
  • the separation effect makes it focus on multiple points (forming a "rainbow” phenomenon).
  • the material of the third lens is a first material, and at least one surface of the third lens is a spherical surface.
  • the spherical radius of the spherical surface of the third lens is R, -100mm ⁇ R ⁇ 100mm.
  • the material of the third lens is the first material.
  • the manufacturing and molding of the third lens is more difficult than that of plastic lenses, and the spherical radius is too large to ensure the surface shape of the lens.
  • the application limits the spherical radius between plus and minus 100 millimeters, which helps reduce the difficulty in forming the third lens (the material is the first material, which can be glass) and ensures the manufacturability of the glass lens.
  • the focal length of the third lens is f3, which satisfies 0.1 ⁇ f3/f ⁇ 3. Since the lens of the first material occupies the main refractive power in the optical lens and lens group provided in this application and has the greatest impact on the optical performance, this embodiment limits the range of the ratio of the focal length of the third lens to the effective focal length of the optical lens group. To adjust the optical performance of the optical lens lens group.
  • the number of the plurality of lenses is six, which are the first lens, the second lens, and the third lens arranged in sequence from the object side to the image side.
  • the fourth lens, the fifth lens, and the sixth lens, the distance between the fourth lens and the fifth lens is SP4, and the distance from the object side vertex position of the first lens to the image side vertex position of the sixth lens
  • SP4/LT the distance from the object side vertex position of the first lens to the image side vertex position of the sixth lens
  • the distance between the fourth lens and the fifth lens is defined, and the purpose is to facilitate the process stability of the optical lens assembly. Specifically, the distance between the lenses is large, the assembly accuracy is not easy to guarantee, and the assembly difficulty is relatively large, which will affect the yield of the optical lens.
  • This embodiment ensures that the ratio of the spacing to the LT is less than 0.5, so that the spacing is within a reasonable range Inside, reduce the difficulty of assembly and increase the yield.
  • the pitch between adjacent lenses refers to the distance between adjacent optical surfaces in the optical axis direction.
  • the number of the plurality of lenses is six, which are the first lens, the second lens, and the third lens arranged in sequence from the object side to the image side.
  • the fourth lens, the fifth lens and the sixth lens, the material of the fourth lens is the first material, and at least one surface of the fourth lens is a spherical surface.
  • the spherical radius of the spherical surface of the fourth lens is R, -100mm ⁇ R ⁇ 100mm.
  • the focal length of the fourth lens is f4, which satisfies 0.1 ⁇ f4/f ⁇ 3.
  • the distance between the fifth lens and the sixth lens is SP5
  • the distance from the object side vertex position of the first lens to the image side vertex position of the sixth lens is LT, SP5/ LT ⁇ 0.2
  • an embodiment of the present invention provides a camera including a lens barrel and the optical lens group according to any one of the foregoing embodiments, and the optical lens group is installed in the lens barrel.
  • this application provides a terminal device including the aforementioned camera.
  • the optical effect of the optical lens group can be suppressed, so that the optical lens group
  • the focal length and MTF (Modulation Transfer Function) parameters are not sensitive to temperature, which helps to reduce the stroke margin of the voice coil motor to compensate the temperature drift effect of the lens group or cancel the temperature drift effect compensation algorithm of the photographic system to improve User experience, can obtain excellent optical quality.
  • FIG. 1 is a schematic diagram of the optical lens set provided by the present application applied to a terminal device
  • Fig. 2a is a schematic diagram of an optical lens assembly provided by the first embodiment of the present application.
  • Figure 2b is an axial spherical phase difference curve of the optical system of the first embodiment
  • Figure 2c is an astigmatism curve of the optical system of the first embodiment
  • 2d is a distortion curve of the optical system of the first embodiment
  • 2e is a vertical axis chromatic aberration curve of the optical system of the first embodiment
  • Fig. 3a is a schematic diagram of an optical lens assembly provided by a second embodiment of the present application.
  • Figure 3b is an axial spherical phase difference curve of the optical system of the second embodiment
  • Fig. 3c is an astigmatism curve of the optical system of the second embodiment
  • Figure 3d is a distortion curve of the optical system of the second embodiment
  • 3e is a vertical axis chromatic aberration curve of the optical system of the second embodiment
  • FIG. 4a is a schematic diagram of an optical lens assembly provided by a third embodiment of the present application.
  • 4b is an axial spherical phase difference curve of the optical system of the third embodiment
  • Fig. 4c is an astigmatism curve of the optical system of the third embodiment
  • Figure 4d is a distortion curve of the optical system of the third embodiment
  • Fig. 4e is a vertical axis chromatic aberration curve of the optical system of the third embodiment.
  • the optical lens group 10 involved in the present application may be a telephoto camera system, which is applied to a camera in a terminal device 100.
  • the terminal device 100 may be a portable terminal such as a mobile phone and a tablet.
  • the optical lens group 10 may be a telephoto lens group, and the optical lens group 10 is installed in the lens barrel of the camera.
  • the camera is assembled inside the terminal device 100 and may be a rear camera or a front camera of the terminal device 100, or a telescopic camera that can extend out of the housing of the terminal device 100.
  • the optical lens set provided by the present application includes six lenses, and the six lenses are sequentially distributed from the object side to the image side along the optical axis direction as a first lens, a second lens, a third lens, a fourth lens, and a second lens.
  • Five lenses and a sixth lens, at least one of the six lenses is made of a first material, and the relative refractive index temperature drift coefficient of the first material is smaller than the relative refractive index temperature drift coefficient of the plastic material, for example, Glass material.
  • the refractive index of glass material is not sensitive to the temperature drift coefficient. Specifically, the relative refractive index temperature drift coefficient of glass material is negative, the relative refractive index temperature drift coefficient of plastic material is positive, and the relative refractive index temperature drift coefficient of glass material is positive.
  • the refractive index temperature drift coefficient and the relative refractive index temperature drift coefficient of plastic materials are opposite numbers.
  • the first lens has positive refractive power
  • the second lens has negative refractive power
  • the third lens has positive refractive power
  • the effective focal length of the optical lens group is f
  • the object side of the first lens The distance from the surface to the imaging surface on the optical axis is TTL, and TTL/f ⁇ 0.96.
  • the first material is selected, and the optical power distribution of the first three lenses can improve the temperature effect of the optical lens group, making the effective focal length and MTF of the optical lens group insensitive to temperature , It is beneficial to reduce the stroke margin of the voice coil motor used to compensate the temperature drift effect of the lens group or cancel the temperature drift effect compensation algorithm of the optical lens group, and improve the user experience.
  • the glass material can be: crown glass, flint glass, borosilicate glass, quartz glass, etc.
  • the first three lenses that is, the first lens, the second lens, and the third lens described in this application
  • the first lens distributes the main refractive power of the optical lens group
  • the aspheric curve equation of the lens is defined as follows:
  • Z The point on the aspheric surface from the optical axis of r, and the vertical distance between it and the tangent plane that is tangent to the intersection on the optical axis of the aspheric surface;
  • r the vertical distance between the point on the aspherical curve and the optical axis
  • the dotted line in the middle represents the optical axis
  • the left side of the optical lens group is the object side
  • the right side is the image side.
  • the optical lens group provided by this embodiment, from the object side to the image side along the optical axis, there are vignetting stop ST1, first lens L1, second lens L2, third lens L3, aperture stop STO, and second lens.
  • vignetting stop ST1 first lens L1, second lens L2, third lens L3, aperture stop STO, and second lens.
  • Four lens L4, fifth lens L5, sixth lens L6, infrared filter element IRCF, electronic photosensitive element can be placed on the image surface.
  • the first lens L1 has positive refractive power and is made of resin material (resin material is also called plastic material, and the following description has the same explanation).
  • resin material is also called plastic material, and the following description has the same explanation.
  • the object side surface S1 is convex near the optical axis, and the image side surface S2 is near the optical axis. It is concave and is aspheric.
  • the second lens L2 has negative refractive power and is made of resin.
  • the object side surface S3 is convex near the optical axis, and the image side surface S4 is concave near the optical axis, and both are aspherical.
  • the third lens L3 has positive refractive power and is made of glass.
  • the object side surface S5 is convex near the optical axis, and the image side surface S6 is convex near the optical axis, and both are spherical.
  • the fourth lens L4 has negative refractive power and is made of resin.
  • the object side surface S7 is concave near the optical axis, and the image side surface S8 is concave near the optical axis, and both are aspherical.
  • the fifth lens L5 has positive refractive power and is made of resin.
  • the object side surface S9 is concave near the optical axis, and the image side surface S10 is convex near the optical axis, and both are aspherical.
  • the sixth lens L6 has negative refractive power and is made of resin.
  • the object side surface S11 is concave near the optical axis, and the image side surface S12 is concave near the optical axis, and both are aspherical.
  • Both the object side surface S13 and the image side surface S14 of the infrared filter element IRCF are flat surfaces.
  • Plastic refers to a polymer material (or directly polymerized with monomers during processing) as the main component, with plasticizers, fillers, lubricants, colorants and other additives as auxiliary components, which can flow into shape during processing material.
  • Resin material is a kind of plastic.
  • the distance from the object side surface S1 of the first lens L1 to the infinity object on the optical axis from the imaging surface S15 is TTL, and the effective focal length of the optical lens group is f, which can meet the following conditions: TTL/f ⁇ 0.96, achieving shorter TTL , It is conducive to the miniaturization design of the optical lens group, saves the internal space of the terminal equipment, and is conducive to the thin development of the terminal equipment.
  • the dispersion coefficient (Abbe number) of the third lens L3 is V3, and V3 satisfies 15 ⁇ V3 ⁇ 100.
  • the chromatic aberration of the lens group can be corrected through reasonable power distribution and dispersion coefficient selection.
  • Example 1 when the temperature changes by ⁇ °C, the amount of change in focal length f is ⁇ f. ⁇ f/ ⁇ °C is defined as the temperature drift coefficient of the lens group.
  • the temperature drift coefficient satisfies the following conditions: -1um/°C ⁇ f/ ⁇ °C ⁇ 1um/°C, which can improve the temperature drift effect of the photographic system.
  • the relative refractive index temperature drift coefficient ⁇ is defined as (dn/dt)rel (n is the refractive index, T is the temperature), which indicates the coefficient of change of the refractive index of the material in air and other media with temperature.
  • the pitch between adjacent lenses refers to the distance between adjacent optical surfaces in the optical axis direction.
  • the distance between the fourth lens L4 and the fifth lens L5 is SP4 (that is, along the optical axis direction, the distance between the image side surface S8 of the fourth lens L4 and the object side surface S9 of the fifth lens L5 ), the distance from the object side vertex position of the first lens L1 to the image side vertex position of the sixth lens L6 is LT, SP4/LT ⁇ 0.5, which helps reduce the difficulty of lens assembly implementation. Specifically, the distance between the lenses is large, the assembly accuracy is not easy to guarantee, and the assembly difficulty is relatively large, which will affect the yield of the optical lens.
  • This embodiment ensures that the distance between the fourth lens L4 and the fifth lens L5 is SP2
  • the ratio to LT is less than or equal to 0.5, so that the distance between the fourth lens L4 and the fifth lens L5 is within a reasonable range, which reduces the difficulty of assembly and improves the yield.
  • the object-side vertex of the lens mentioned in this application refers to the position of the object-side surface of the lens on the optical axis
  • the image-side vertex position refers to the position of the image-side surface of the lens on the optical axis. The same applies to other embodiments. Explanation.
  • Embodiment 1 it is possible to choose a vignetting stop ST1 (not shown) in front of the first lens L1 (ie, the object side), and a vignetting stop ST2 (not shown) behind the fifth lens L5 (ie, the image side). Not shown), can effectively reduce the diameter of the lens group.
  • the effective focal length of the optical lens group is f
  • the radius of curvature of the object side surface of the second lens L2 is R21
  • the radius of curvature of the image side surface of the second lens L2 is R22, which satisfies the following conditions:
  • 3.78, which is good for correcting system aberrations, so that the vertical axis chromatic aberration of the optical lens group is less than 1.5um, the axial chromatic aberration is less than 10um, and the distortion is less than 1%.
  • Table 1a shows a table of the characteristics of the optical system of this embodiment, and the units of the radius of curvature and the thickness are millimeters (mm).
  • Table 1b shows the high-order coefficients A4, A6, A8, and A10 that can be used for each aspheric mirror surface S1-S12 in the first embodiment.
  • Table 1c shows the object side surface S1 of the first lens L1 of the optical system of this embodiment to infinity.
  • the distance from the imaging surface S15 on the optical axis is TTL, the maximum image height of the optical lens group ImgH, and the optical lens group
  • the effective focal length of is f, the first lens focal length f1, the second lens focal length f2, the third lens focal length f3, the fourth lens focal length f4, the fifth lens focal length f5, and the sixth lens focal length f6.
  • Figure 2b shows the axial spherical phase difference curve of the optical system of the first embodiment.
  • the horizontal axis is the focus position on the optical axis
  • the vertical axis is the field of view, which represents the axial focus positions of five rays of different wavelengths in different fields of view. .
  • Figure 2c shows the astigmatism curve of the optical system of the first embodiment, which represents meridional field curvature and sagittal field curvature, where the solid line with larger curvature represents the meridional field curvature, and the dashed line with smaller curvature Shows the sagittal image surface curvature.
  • Fig. 2d shows a distortion curve of the optical system of the first embodiment, which represents the magnitude of distortion corresponding to different field angles.
  • the vertical axis is the image height change
  • the vertical axis is the field of view, which represents the vertical axis chromatic aberration of five different wavelengths of light at different field angles.
  • the optical system provided in the first embodiment can achieve good imaging quality.
  • the optical lens group of this embodiment from the object side to the image side along the optical axis, there are vignetting stop ST1, first lens L1, second lens L2, third lens L3, and aperture.
  • the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the infrared filter element IRCF, and the electronic photosensitive element can be placed on the image surface.
  • the first lens L1 has a positive refractive power and is made of resin.
  • the object side surface S1 is convex near the optical axis, and the image side surface S2 is concave near the optical axis, and both are aspherical.
  • the second lens L2 has negative refractive power and is made of resin.
  • the object side surface S3 is convex near the optical axis, and the image side surface S4 is concave near the optical axis, and both are aspherical.
  • the third lens L3 has a positive refractive power and is made of glass.
  • the object side surface S5 is convex near the optical axis, and the image side surface S6 is concave near the optical axis, both of which are spherical.
  • the fourth lens L4 has negative refractive power and is made of resin.
  • the object side surface S7 is concave near the optical axis, and the image side surface S8 is concave near the optical axis, and both are aspherical.
  • the fifth lens L5 has positive refractive power and is made of resin.
  • the object side surface S9 is concave near the optical axis, and the image side surface S10 is convex near the optical axis, and both are aspherical.
  • the sixth lens L6 has negative refractive power and is made of resin.
  • the object side surface S11 is concave near the optical axis, and the image side surface S12 is concave near the optical axis, and both are aspherical.
  • the distance from the object side surface S1 of the first lens L1 to the infinity object on the optical axis from the imaging surface S15 is TTL, and the effective focal length of the optical lens group is f, which can meet the following conditions: TTL/f ⁇ 0.96, achieving shorter TTL , It is conducive to the miniaturization design of the optical lens group, saves the internal space of the terminal equipment, and is conducive to the thin development of the terminal equipment.
  • the dispersion coefficient (Abbe number) of the third lens L3 is V3, and V3 satisfies 15 ⁇ V3 ⁇ 100.
  • the chromatic aberration of the lens group can be corrected through reasonable power distribution and dispersion coefficient selection.
  • Example 2 when the temperature changes by ⁇ °C, the change in focal length f is ⁇ f.
  • ⁇ f/ ⁇ °C is defined as the temperature drift coefficient of the lens group.
  • the temperature drift coefficient satisfies the following conditions: -1um/°C ⁇ f/ ⁇ °C ⁇ 1um/°C, which can improve the temperature drift effect of the photographic system.
  • the relative refractive index temperature drift coefficient ⁇ is defined as (dn/dt) rel, which represents the coefficient of change of the refractive index of the material in air and other media with temperature.
  • the distance between the fourth lens L4 and the fifth lens L5 is SP4
  • the distance between the object side vertex position of the first lens L1 and the image side vertex position of the sixth lens L6 is LT, SP4/LT ⁇ 0.5, which is beneficial to reduce The difficulty of the implementation of lens assembly.
  • a vignetting stop ST1 (not shown) can be selected in front of the first lens L1 (that is, on the object side), and a vignetting stop ST2 (not shown) behind the fifth lens L5 (that is, on the image side). Not shown), can effectively reduce the diameter of the lens group.
  • the effective focal length of the optical lens group is f
  • the radius of curvature of the object side surface of the second lens L2 is R21
  • the radius of curvature of the image side surface of the second lens L2 is R22, satisfying the following conditions:
  • 8.6, which is good for correcting system aberrations, so that the vertical axis chromatic aberration of the optical lens group is less than 1.5um, the axial chromatic aberration is less than 10um, and the distortion is less than 1%.
  • Table 2a shows a table of the characteristics of the optical system of this embodiment, and the units of the radius of curvature and the thickness are millimeters (mm).
  • Table 2b shows the high-order coefficients A4, A6, A8, and A10 that can be used for each aspheric mirror S1-S12 in the second embodiment.
  • Table 2c shows the object side surface S1 of the first lens L1 of the optical system of this embodiment to infinity.
  • the distance from the imaging surface S15 on the optical axis is TTL, the maximum image height of the optical lens group ImgH, and the optical lens group
  • the effective focal length of is f, the first lens focal length f1, the second lens focal length f2, the third lens focal length f3, the fourth lens focal length f4, the fifth lens focal length f5, and the sixth lens focal length f6.
  • Figure 3b shows the axial spherical phase difference curve of the optical system of the second embodiment.
  • the horizontal axis is the focus position on the optical axis
  • the vertical axis is the field of view, which represents the axial focus positions of five rays of different wavelengths in different fields of view. .
  • Figure 3c shows the astigmatism curve of the optical system of the second embodiment, which represents meridional field curvature and sagittal field curvature, where the solid line with larger curvature represents the meridional field curvature, and the dashed line with smaller curvature Shows the sagittal image surface curvature.
  • FIG. 3d shows a distortion curve of the optical system of the second embodiment, which represents the distortion magnitude values corresponding to different field angles.
  • FIG. 3e shows the vertical axis chromatic aberration curve of the optical system of the second embodiment, the horizontal axis is the image height change, and the vertical axis is the field of view, which represents the vertical axis chromatic aberration of five different wavelength rays at different angles of view.
  • the optical system provided in the second embodiment can achieve good imaging quality.
  • the optical lens group of this embodiment from the object side to the image side along the optical axis, there are an aperture stop STO, a first lens L1, a second lens L2, a third lens L3, and a second lens in order from the object side to the image side.
  • Four lens L4, fifth lens L5, sixth lens L6, infrared filter element IRCF, electronic photosensitive element can be placed on the image surface.
  • the first lens L1 has positive refractive power and is made of resin.
  • the object side surface S1 is convex near the optical axis, and the image side surface S2 is convex near the optical axis, and both are aspherical.
  • the second lens L2 has negative refractive power and is made of resin.
  • the object side surface S3 is a concave surface near the optical axis
  • the image side surface S4 is a concave surface near the optical axis, and both are aspherical.
  • the third lens L3 has a positive refractive power and is made of resin.
  • the object side surface S5 is convex near the optical axis, and the image side surface S6 is convex near the optical axis, both of which are spherical.
  • the fourth lens L4 has a positive refractive power and is made of glass.
  • the object side surface S7 is a concave surface near the optical axis
  • the image side surface S8 is a concave surface near the optical axis, and both are spherical.
  • the fifth lens L5 has negative refractive power and is made of resin.
  • the object side surface S9 is concave near the optical axis, and the image side surface S10 is convex near the optical axis, both of which are aspherical.
  • the sixth lens L6 has negative refractive power and is made of resin.
  • the object side surface S11 is concave near the optical axis, and the image side surface S12 is convex near the optical axis, both of which are aspherical.
  • the distance from the object side surface S1 of the first lens L1 to the infinite object on the optical axis from the imaging surface S15 is TTL, and the effective focal length of the optical lens group is f, which can meet the following conditions: TTL/f ⁇ 0.94, achieving shorter TTL , It is conducive to the miniaturization design of the optical lens group, saves the internal space of the terminal equipment, and is conducive to the thin development of the terminal equipment.
  • the dispersion coefficient (Abbe number) of the fourth lens L4 is V4, and V4 satisfies 15 ⁇ V4 ⁇ 100.
  • the chromatic aberration of the lens group can be corrected through reasonable power distribution and dispersion coefficient selection.
  • Example 3 when the temperature changes by ⁇ °C, the amount of change in f is ⁇ f.
  • ⁇ f/ ⁇ °C is defined as the temperature drift coefficient of the lens group.
  • the temperature drift coefficient satisfies the following conditions: -1um/°C ⁇ f/ ⁇ °C ⁇ 1um/°C, which can improve the temperature drift effect of the photographic system.
  • the relative refractive index temperature drift coefficient ⁇ is defined as (dn/dt) rel, which represents the coefficient of change of the refractive index of the material in air and other media with temperature.
  • the distance between the fifth lens L5 and the sixth lens L6 is SP5
  • the distance between the vertex position of the first lens L1 on the object side and the vertex position on the image side of the sixth lens L6 is LT, SP5/LT ⁇ 0.2, which is beneficial to reduce The difficulty of the implementation of lens assembly.
  • the effective focal length of the optical lens group is f
  • the curvature radius of the object side surface of the second lens L2 is R21
  • the curvature radius of the image side surface of the second lens L2 is R22, which satisfies the following conditions:
  • 1.99, which is good for correcting system aberrations, so that the vertical axis chromatic aberration of the optical lens group is less than 1.5um, the axial chromatic aberration is less than 10um, and the distortion is less than 1%.
  • the optical lens set provided in this application defines the power, material, and surface shape (concave or convex) of each lens, and combines the dispersion coefficient, temperature drift coefficient, and relative refractive index temperature drift of the lens.
  • the limits of the coefficient, the distance between adjacent lenses and the radius of curvature of each surface not only solve the problem of temperature drift effect, but also improve the imaging effect, and are beneficial to correct the comprehensive aberration of the optical lens set, so that the optical lens set provided by this application
  • the vertical axis chromatic aberration is less than 1.5um
  • the axial chromatic aberration is less than 10um
  • the distortion is less than 1%.
  • Table 3a shows a table of the characteristics of the optical system of this embodiment, and the units of the radius of curvature and the thickness are millimeters (mm).
  • Table 3b shows the coefficients A4 and A6 of the higher-order terms that can be used for each aspheric mirror S1-S12 in the third embodiment.
  • Table 3c shows the object-side surface S1 of the first lens L1 of the optical system of this embodiment to infinity.
  • the distance from the imaging surface S15 on the optical axis is TTL, the maximum image height of the optical lens group ImgH, and the optical lens group
  • the effective focal length of is f, the first lens focal length f1, the second lens focal length f2, the third lens focal length f3, the fourth lens focal length f4, the fifth lens focal length f5, and the sixth lens focal length f6.
  • Fig. 4b shows the axial spherical phase difference curve of the optical system of the third embodiment.
  • the horizontal axis is the focus position on the optical axis
  • the vertical axis is the field of view, which represents the axial focus positions of five rays of different wavelengths in different fields of view. .
  • Figure 4c shows the astigmatism curve of the optical system of the third embodiment, which represents meridional field curvature and sagittal field curvature, where the solid line with larger curvature represents the meridional field curvature, and the dashed line with smaller curvature It means sagittal image plane curvature.
  • FIG. 4d shows a distortion curve of the optical system of the third embodiment, which represents the distortion magnitude values corresponding to different field angles.
  • Fig. 4e shows the vertical axis chromatic aberration curve of the optical system of the third embodiment
  • the horizontal axis is the image height change
  • the vertical axis is the field of view, which represents the vertical axis chromatic aberration of five rays of different wavelengths at different field angles.
  • FIGS. 4b to 4e It can be seen from FIGS. 4b to 4e that the optical system provided in the third embodiment can achieve good imaging quality.
  • the optical lens set provided in this application defines the power, material, and surface shape (concave or convex) of each lens, and combines the dispersion coefficient, temperature drift coefficient, and relative refractive index temperature drift of the lens.
  • the limits of the coefficient, the distance between adjacent lenses and the radius of curvature of each surface not only solve the problem of temperature drift effect, but also improve the imaging effect, and are beneficial to correct the comprehensive aberration of the optical lens set, so that the optical lens set provided by this application
  • the vertical axis chromatic aberration is less than 1.5um
  • the axial chromatic aberration is less than 10um
  • the distortion is less than 1%.
  • the optical effect of the optical lens group can be suppressed, so that the optical lens group
  • the focal length and MTF (Modulation Transfer Function) parameters are not sensitive to temperature, which helps to reduce the stroke margin of the voice coil motor to compensate the temperature drift effect of the lens group or cancel the temperature drift effect compensation algorithm of the photographic system to improve User experience, can obtain excellent optical quality.

Abstract

一种光学镜头组（10）、摄像头及终端设备（100）。光学镜头组（10）包括沿着光轴方向从物侧至像侧依序排列的多个透镜（L1、L2、L3、L4、L5、L6），其中至少一个透镜的材质为第一材质。第一材质的相对折射率温漂系数小于塑料材质的相对折射率温漂系数。多个透镜（L1、L2、L3、L4、L5、L6）中，从物侧至像侧方向的前三个透镜（L1、L2、L3）依次为第一透镜（L1）、第二透镜（L2）和第三透镜（L3）。第一透镜（L1）为正光焦度，第二透镜（L2）为负光焦度，第三透镜（L3）为正光焦度。光学镜头组（10）的有效焦距为f，第一透镜（L1）之物侧表面（S1）至成像面（S15）于光轴上的距离为TTL，TTL/f≤0.96。通过对透镜的材质及前三个透镜（L1、L2、L3）的光焦度的限定，结合其余透镜的光焦度，解决了温漂效应的问题，能够提升成像效果。

Description

光学镜头组、摄像头及终端设备
本申请要求在2019年6月27日提交中国国家知识产权局、申请号为201910572891.0的中国专利申请的优先权，发明名称为“摄影光学系统的长焦镜头组、取像装置与便携式终端设备”的中国专利申请的优先权，在2019年9月27日提交中国国家知识产权局、申请号为201910940153.7的中国专利申请的优先权，发明名称为“光学镜头组、摄像头及终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明属于光学成像技术领域，尤其涉及一种摄影光学系统的长焦镜头组及终端设备。
背景技术
便携式终端设备应用越来越广泛，摄像头是典型的终端设备组件。随着手机等便携设备的不断发展，摄像头应用日益多样化。在多摄的组合式变焦系统中，长焦镜头组已成为终端设备的摄影头的发展趋势。
通常情况下，终端设备的长焦摄影镜头组采用4片-6片塑胶透镜结构设计，光学镜头组的有效焦距和后截距随温度发生变化，称为温漂效应。随着光学镜头组的有效焦距增长，镜头组的温漂效应更加明显。温漂效应的问题严重影响了用户体验。
如果解决长焦镜头组的温漂效应为业界研发的方向。
发明内容
本申请提供一种光学镜头组、摄像头及终端设备，光学镜头组为长焦镜头，通过对透镜的材质限定，以及对近物侧前三个透镜的光焦度的限定，结合其余透镜的光焦度，解决了温漂效应的问题，能够提升成像效果，提供用户良好的体验。
第一方面，本发明实施例提供了一种光学镜头组，包括多个沿着光轴方向从物侧至像侧依序排列的多个透镜，透镜的数量可以为四个、五个、六个或七个等等。所述多个透镜中的至少一个透镜的材质为第一材质，所述第一材质的相对折射率温漂系数小于塑料材质的相对折射率温漂系数，第一材质可以为玻璃材质，其它透镜的材质为塑料。所述多个透镜中，从物侧至像侧方向的前三个透镜依次为第一透镜、第二透镜和第三透镜，所述第一透镜为正光焦度，所述第二透镜为负光焦度，所述第三透镜为正光焦度，所述光学镜头组的有效焦距为f，所述第一透镜之物侧表面至成像面于所述光轴上的距离为TTL，TTL/f≦0.96。所述第一透镜之物侧表面至成像面于所述光轴上的距离为TTL具体指的是第一透镜物侧表面与光轴的交点与成像面与光轴的交点之间的距离。本申请通过对至少一个透镜的材质限定为相对折射率温漂系数小于塑料材质的相对折射率温漂系数的第一材质，结合第一透镜、第二透镜和第三透镜及其余透镜的光焦度的限定，能够抑制光学镜头组的温漂效应及解决综合色差问题，即使在高温环境下，也能保证光学镜头组的成像效果，而且可以得到较短的光学镜头组的总长。
一种可能的实施方式中，所述第一材质的相对折射率温漂系数为β(表示材料在空气等介质中的折射率随温度变化系数)，-9×10 -5≤β≤9×10 -5。本实施方式通过对第一材质的相 对折射率温漂系数的范围的限定及光焦度的分配，对光学镜头组而言，能够获得较小的系统温漂系数。具体而言，所述第一材质的相对折射率温漂系数为β，-9×10 -5≤β≤0，换言之，第一材质的相对折射率温漂系数选负值，可以为塑料材质的相对折射率温漂系数的相反数，例如玻璃材质。塑料材质的透镜的相对折射率温漂系数为正值，通过为负值的相对折射率温漂系数的设置，能够抵消部分塑料材质的透镜的相对折射率温漂系数，从而从整体效果来看，对光学镜头组而言，能够获得较小的系统温漂系数。
一种可能的实施方式中，所述光学镜头组的温漂系数为△f/△℃，-2.6um/℃≤△f/△℃≤2.6um/℃，利于抑制所述光学镜头组的温漂效应。本实施方式对温漂系数为范围的限定，可以保证光学镜头组满足使用需求，为了更优化其设计架构，温漂系数的范围可以具体为-1um/℃≤△f/△℃≤1um/℃。光学镜头组的温漂系数△f/△℃的绝对值越小，成像效果越好。
一种可能的实施方式中，所述第二透镜物侧表面的曲率半径为R21，所述第二透镜的像侧表面的曲率半径为R22，满足条件：|f/R21|+|f/R22|<10，以利于校正所述光学镜头组的综合像差。当|f/R21|+|f/R22|大于等于10的情况，不利于校正光学镜头组的综合像差，会影响成像效果。
一种可能的实施方式中，根据透镜材质的密度分配厚度，使得长焦镜头组的重量前后均匀，重心位置位于光学镜头组中心附近，保证光学镜头组的姿态平稳。光学镜头组的重心位于所述光学镜头组的中心位置，光学镜头组的中心位置指的是第一个透镜的物侧与光轴的交点至最后一个透镜的像侧与光轴的交点之间的中点的位置，本申请不限定中心位置为中点位置，可以在中点位置附近的范围内，只要能保证所有的透镜组装在摄像头的镜筒中时，摄像头前后重量均匀即可。因为本申请多个透镜中，至少其中一个透镜的材质为第一材质，例如玻璃，其余透镜的材质为塑料材质，第一材质的透镜比其它透镜要重，容易出现重心偏的问题，这样在摄像头使用的过程中，音圈马达驱动摄像头实现防抖的过程中，由于重心偏，不容易实现防抖。而本申请通过重心位置的限定，使得光学镜头组姿态平稳，这样在使用的过程中，更容易解决摄像头防抖的问题。
一种可能的实施方式中，所述多个透镜的数量为六个，分别为从物侧至像侧方向的依次排布的所述第一透镜、所述第二透镜、所述第三透镜、第四透镜、第五透镜和第六透镜，所述光学镜头组还包括渐晕光阑，所述渐晕光阑设置在所述第一透镜的物侧和/或设置在所述第六透镜的像侧，渐晕光阑能够拦截像差大的成像光线(又称为拦截轴外点光束)，提高成像质量，利于减小所述光学镜头组的外径。
一种可能的实施方式中，具有第一材质的透镜的色散系数(阿贝数)为V，满足条件：15≤V≤100。本实施方式通过合理的光焦度分配和色散系数的选择，能够校正光学镜头组的色差，得到清晰度较好的成像效果。色散系数是衡量透镜成像清晰度的重要指标，通常用阿贝数(色散系数)表示。阿贝数越大，色散就越小，反之，阿贝数越小，则色散就越大，其成像的清晰度就越差。即表征某种材料对光源(光波谱线)的分离作用，理想透镜是一束平行白光通过后，聚焦于一点，但由于材料对不同的光波波长表现出不同的折射率，就对光线产生了分离作用，使其聚焦于多点(形成“彩虹”现象)。总的来说有这样一个规律：材料的折射率越大，色散越厉害，即阿贝数越低。
一种可能的实施方式中，所述第三透镜的材质为第一材质，所述第三透镜的至少一个表面为球面。所述第三透镜的所述球面表面的球面半径为R，-100mm<R<100mm。本实施方式第 三透镜的材质为第一材质，以玻璃材质为例，第三透镜的制造成型相较塑料材质的透镜，难度较大，且球面半径过大，难以保证透镜的面型，本申请通过限定球面半径在正负100毫米之间，有利于降低第三透镜(材质为第一材质，可以为玻璃材质)的成型难度，确保玻璃透镜的可制造性。
一种可能的实施方式中，所述第三透镜的焦距为f3，满足0.1≤f3/f≤3。由于第一材质的透镜在本申请提供的光学透镜且镜头组中，占据主要光焦度，对光学性能的影响最大，本实施方式通过限定第三透镜焦距与光学透镜组有效焦距比值的范围，来调节光学透镜镜头组的光学性能。
一种可能的实施方式中，所述多个透镜的数量为六个，分别为从物侧至像侧方向的依次排布的所述第一透镜、所述第二透镜、所述第三透镜、第四透镜、第五透镜和第六透镜，所述第四透镜和所述第五透镜的间距为SP4，所述第一透镜物侧顶点位置到所述第六透镜像侧顶点位置的间距为LT，SP4/LT≤0.5。本实施方式通过将第四透镜和第五透镜之间的间距的限定，目的是为了利于所述光学镜头组的工艺的稳定性。具体而言，透镜之间的间距大，组立精度不容易保证，组立难度比较大，会影响光学镜头且的良率，本实施方式保证间距与LT之比小于0.5，使得间距在合理范围内，降低组立难度，提升良率。相邻的透镜之间的间距指的是沿光轴方向上相邻的光学表面之间的距离。
一种可能的实施方式中，所述多个透镜的数量为六个，分别为从物侧至像侧方向的依次排布的所述第一透镜、所述第二透镜、所述第三透镜、第四透镜、第五透镜和第六透镜，所述第四透镜的材质为第一材质，所述第四透镜的至少一个表面为球面。所述第四透镜的所述球面表面的球面半径为R，-100mm<R<100mm。本实施方式有利于降低第四透镜(材质为第一材质，可以为玻璃材质)的成型难度，确保玻璃透镜的可制造性。
一种可能的实施方式中，所述第四透镜的焦距为f4，满足0.1≤f4/f≤3。
一种可能的实施方式中，所述第五透镜和所述第六透镜的间距为SP5，所述第一透镜物侧顶点位置到所述第六透镜像侧顶点位置的间距为LT，SP5/LT≤0.2，本实施方式通过将第五透镜和第六透镜之间的间距的限定，目的是为了利于降低镜头组立难度。
第二方面，本发明实施例提供了一种摄像头，包括镜筒和前述任意一种实施方式所述的光学镜头组，所述光学镜头组安装在所述镜筒内。
第三方面，本申请提供一种终端设备，包括所述的摄像头。
本申请通过将光学镜头组中的至少一个透镜的材质选择为相对折射率温漂系数小于塑料材质的相对折射率温漂系数的第一材质，能够抑制光学镜头组的光学效应，使得光学镜头组的焦距和MTF(Modulation Transfer Function(调制传递函数))等参数对温度不敏感，利于减少音圈马达用于补偿镜头组温漂效应的行程余量或取消摄影系统的温漂效应补偿算法，改善用户体验，能够获得优秀的光学品质。
附图说明
为了更清楚地说明本发明实施例或背景技术中的技术方案，下面将对本发明实施例或背景技术中所需要使用的附图进行说明。
图1是本申请提供的光学镜头组应用在终端设备中的示意图；
图2a是本申请第一实施例提供的光学镜头组的示意图；
图2b是第一实施例的光学系统的轴向球面相差曲线；
图2c是第一实施例的光学系统的像散曲线；
图2d是第一实施例的光学系统的畸变曲线；
图2e是第一实施例的光学系统的垂轴色差曲线；
图3a是本申请第二实施例提供的光学镜头组的示意图；
图3b是第二实施例的光学系统的轴向球面相差曲线；
图3c是第二实施例的光学系统的像散曲线；
图3d是第二实施例的光学系统的畸变曲线；
图3e是第二实施例的光学系统的垂轴色差曲线；
图4a是本申请第三实施例提供的光学镜头组的示意图；
图4b是第三实施例的光学系统的轴向球面相差曲线；
图4c是第三实施例的光学系统的像散曲线；
图4d是第三实施例的光学系统的畸变曲线；
图4e是第三实施例的光学系统的垂轴色差曲线。
具体实施方式
下面结合本发明实施例中的附图对本发明实施例进行描述。
参阅图1，本申请涉及的光学镜头组10可以为长焦摄影系统，应用在终端设备100中的摄像头。终端设备100可以为手机、平板等便携式终端。光学镜头组10可以为长焦镜头组，光学镜头组10安装在摄像头的镜筒内。摄像头组装在终端设备100内部，可以为终端设备100的后置摄像头或前置摄像头，或可以伸出终端设备100外壳的伸缩式的摄像头。
本申请提供的光学镜头组包括六个透镜，所述六个透镜沿着光轴方向从物侧至像侧依序分布分别为第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜，所述六个透镜中的至少一个透镜的材质为第一材质，所述第一材质的相对折射率温漂系数小于塑料材质的相对折射率温漂系数，例如可以为玻璃材质，玻璃材质的折射率对温漂系数不敏感，具体而言，玻璃材质的相对折射率温漂系数为负值，塑料材质的相对折射率温漂系数为正值，且玻璃材质的相对折射率温漂系数与塑料材质的相对折射率温漂系数为相反数。所述第一透镜为正光焦度，所述第二透镜为负光焦度，所述第三透镜为正光焦度，所述光学镜头组的有效焦距为f，所述第一透镜之物侧表面至成像面于所述光轴上的距离为TTL，TTL/f≦0.96。通过对至少一个透镜的特殊选材，选用第一材质，配合前三片透镜的光焦度的分配，能够改善光学镜头组的温度效应，使得光学镜头组的有效焦距和MTF等参数对温度不敏感，利于减少音圈马达用于补偿镜头组温漂效应的行程余量或取消光学镜头组的温漂效应补偿算法，提升用户的使用体验。
具体而言，玻璃材质可以为：冕牌玻璃、火石玻璃、硼硅酸盐玻璃、石英玻璃等。
具体而言，光学镜头组的从物侧至像侧分布的前三片透镜(即本申请所述的第一透镜、第二透镜和第三透镜)分配了光学镜头组的主要光焦度，通过将所述第一透镜为正光焦度，所述第二透镜为负光焦度，所述第三透镜为负光焦度，可以更好地校正光学镜头组的色差，提升成像品质。
透镜的非球面曲线方程式如下定义：
Figure PCTCN2020098601-appb-000001
Z：非球面上距离光轴为r的点，其与相切于非球面光轴上交点的切面的垂直距离；
r：非球面曲线上的点与光轴的垂直距离；
C：曲率；k：锥面系数；α i：第i阶非球面系数。
以下通过七个具体的实施例对本申请进行详细的说明。
以下通过三个具体的实施例对本申请进行详细的说明。
实施例一
如图2a所示，中间的点划线表示光轴，光学镜头组左侧为物侧，右侧为像侧。本实施例提供的光学镜头组中，沿着光轴从物侧到像侧依次为渐晕光阑ST1、第一个透镜L1、第二透镜L2、第三透镜L3、孔径光阑STO、第四透镜L4、第五透镜L5、第六透镜L6，红外滤光元件IRCF、电子感光元件可置于像面。
第一透镜L1具有正光焦度，且为树脂材质(树脂材质也称为塑料材质，下文描述具相同的解释)，其物侧表面S1近光轴处为凸面，像侧表面S2近光轴处为凹面，均为非球面。
第二透镜L2具有负光焦度，且为树脂材质，其物侧表面S3近光轴处为凸面，像侧表面S4近光轴处为凹面，均为非球面。
第三透镜L3具有正光焦度，且为玻璃材质，其物侧表面S5近光轴处为凸面，像侧表面S6近光轴处为凸面，均为球面。
第四透镜L4具有负光焦度，且为树脂材质，其物侧表面S7近光轴处为凹面，像侧表面S8近光轴处为凹面，均为非球面。
第五透镜L5具有正光焦度，且为树脂材质，其物侧表面S9近光轴处为凹面，像侧表面S10近光轴处为凸面，均为非球面。
第六透镜L6具有负光焦度，且为树脂材质，其物侧表面S11近光轴处为凹面，像侧表面S12近光轴处为凹面，均为非球面。
红外滤光元件IRCF的物侧表面S13和像侧表面S14均为平面。
更一般的，上述树脂材质可以替换为其他透明的塑料。通常塑料的相对折射率的温漂系数为正。塑料是指以高分子材料(或在加工过程中用单体直接聚合)为主要成分，以增塑剂、填充剂、润滑剂、着色剂等添加剂为辅助成分，在加工过程中能流动成型的材料。树脂材质是塑料的一种。
第一透镜L1物侧表面S1至无穷远物体距离成像面S15于光轴上的距离为TTL，光学镜头组的有效焦距为f，其可满足下列条件：TTL/f≤0.96，实现较短TTL，利于光学镜头组的小型化设计，节约终端设备内部空间，利于终端设备薄形化发展。
在实施例1中，第三透镜L3的色散系数(阿贝数)为V3，V3满足15≤V3≤100。通过合理的光焦度分配和色散系数选择，能够校正镜头组的色差。
在实施例1中，温度变化△℃时，焦距f变化量为△f。△f/△℃定义为镜头组的温漂系数，其中温漂系数满足如下条件：-1um/℃≤△f/△℃≤1um/℃，能够改善摄影系统的温漂效应。
相对折射率温漂系数β定义为(dn/dt)rel(n是折射率，T是温度)表示材料在空气等介质中的折射率随温度变化系数。实施例1中的第三透镜L3相对折射率温漂系数β3满 足：-9×10 -5≤β3≤9×10 -5，第三透镜L3的焦距为f3，光学镜头组的有效焦距为f，f3/f＝0.40满足0≤f3/f≤3条件，采用低折射率温漂系数材料和光焦度分配能够获得较小的系统温漂系数。
相邻的透镜之间的间距指的是沿光轴方向上相邻的光学表面之间的距离。
在实施例1中，第四透镜L4和第五透镜L5的间距为SP4(即沿着光轴方向，第四透镜L4的像侧表面S8与第五透镜L5的物侧表面S9之间的距离)，第一透镜L1物侧顶点位置到第六透镜L6像侧顶点位置的间距为LT，SP4/LT≤0.5，利于降低镜头组立的实施难度。具体而言，透镜之间的间距大，组立精度不容易保证，组立难度比较大，会影响光学镜头且的良率，本实施方式保证第四透镜L4和第五透镜L5的间距为SP2与LT之比小于等于0.5，使得第四透镜L4和第五透镜L5之间的间距在合理范围内，降低组立难度，提升良率。
本申请所述的透镜的物侧顶点指的是透镜物侧表面在光轴上的位置，像侧顶点位置指的是透镜像侧表面在光轴上的位置，其它的实施例亦是同样的解释。
作为实施例1的扩展，可以选择在第一透镜L1前方(即物侧)有渐晕光阑ST1(未图示)，在第五透镜L5后方(即像侧)有渐晕光阑ST2(未图示)，能够有效减小镜头组的直径。
在实施例1中，光学镜头组的有效焦距为f，第二透镜L2物侧表面的曲率半径为R21，第二透镜L2像侧表面的曲率半径为R22，满足如下条件：|f/R21|+|f/R22|＝3.78，利于校正系统像差，使得光学镜头组的垂轴色差小于1.5um，轴向色差小于10um，畸变小于1％。
表1a示出了本实施例的光学系统的特性的表格，曲率半径、厚度的单位均为毫米(mm)。
表1a
Figure PCTCN2020098601-appb-000002
表1b给出了可用于第一实施例中各非球面镜面S1-S12的高次项系数A4、A6、A8和A10。
表1b
面号 K A4 A6 A8 A10
S1 4.531E-01 -1.486E-03 -1.893E-04 4.767E-07 -6.491E-06
S2 1.2452E+01 2.086E-03 -2.181E-03 -3.017E-04 -1.303E-04
S3 -9.900E+01 -1.792E-02 -8.679E-03 -9.676E-05 5.096E-04
S4 -2.648E+01 -1.461E-04 -2.207E-02 6.717E-03 -6.057E-04
S7 7.882E+00 1.599E-02 3.855E-03 -3.538E-03 1.057E-03
S8 0 2.477E-02 1.529E-02 -1.935E-03 0
S9 -9.900E+01 -1.295E-02 3.351E-03 1.865E-03 -3.532E-03
S10 1.187E+00 9.182E-04 -3.248E-03 9.240E-03 -3.430E-03
S11 -8.169E-01 -4.560E-03 7.245E-04 1.001E-02 -2.065E-03
S12 -9.900E+01 -7.326E-03 4.417E-03 0 0
表1c给出了本实施例的光学系统的第一透镜L1的物侧表面S1至无穷远物体距离成像面S15于光轴上的距离为TTL、光学镜头组的最大像高ImgH、光学镜头组的有效焦距为f、第一透镜焦距f1、第二透镜焦距f2、第三透镜焦距f3、第四透镜焦距f4、第五透镜焦距f5、第六透镜焦距f6。
表1c
参数 TTL ImgH f f1 f2 f3 f4 f5 f6
数值(mm) 12.7 2.5 14.46 8.49 -10.41 5.82 -5.04 4.37 -4.57
图2b示出了第一实施例的光学系统的轴向球面相差曲线，横轴是光轴上聚焦位置，纵轴是视场，其表示五条不同波长的光线在不同视场的轴向聚焦位置。
图2c示出了第一实施例的光学系统的像散曲线，其表示子午像面弯曲和弧矢像面弯曲，其中曲率较大的实线表示的是子午像面弯曲，曲率较小的虚线表示的是弧矢像面弯曲。
图2d示出了第一实施例的光学系统的畸变曲线，其表示不同视场角对应的畸变大小值。
图2e示出了第一实施例的光学系统的垂轴色差曲线，横轴是像高变化，纵轴是视场，其表示五条不同波长的光线在不同视场角对应的垂轴色差大小。
根据图2b至图2e可知，第一实施例所给出的光学系统能够实现良好的成像品质。
实施例二
如图3a所示，本实施方式的光学镜头组中，沿着光轴从物侧到像侧依次为渐晕光阑ST1、第一个透镜L1、第二透镜L2、第三透镜L3、孔径光阑STO、第四透镜L4、第五透镜L5、第六透镜L6，红外滤光元件IRCF、电子感光元件可置于像面。
第一透镜L1具有正光焦度，且为树脂材质，其物侧表面S1近光轴处为凸面，像侧表面S2近光轴处为凹面，均为非球面。
第二透镜L2具有负光焦度，且为树脂材质，其物侧表面S3近光轴处为凸面，像侧表面S4近光轴处为凹面，均为非球面。
第三透镜L3具有正光焦度，且为玻璃材质，其物侧表面S5近光轴处为凸面，像侧表面S6近光轴处为凹面，均为球面。
第四透镜L4具有负光焦度，且为树脂材质，其物侧表面S7近光轴处为凹面，像侧表面 S8近光轴处为凹面，均为非球面。
第五透镜L5具有正光焦度，且为树脂材质，其物侧表面S9近光轴处为凹面，像侧表面S10近光轴处为凸面，均为非球面。
第六透镜L6具有负光焦度，且为树脂材质，其物侧表面S11近光轴处为凹面，像侧表面S12近光轴处为凹面，均为非球面。
第一透镜L1物侧表面S1至无穷远物体距离成像面S15于光轴上的距离为TTL，光学镜头组的有效焦距为f，其可满足下列条件：TTL/f≤0.96，实现较短TTL，利于光学镜头组的小型化设计，节约终端设备内部空间，利于终端设备薄形化发展。
在实施例2中，第三透镜L3的色散系数(阿贝数)为V3，V3满足15≤V3≤100。通过合理的光焦度分配和色散系数选择，能够校正镜头组的色差。
在实施例2中，温度变化△℃时，焦距f变化量为△f。△f/△℃定义为镜头组的温漂系数，其中温漂系数满足如下条件：-1um/℃≤△f/△℃≤1um/℃，能够改善摄影系统的温漂效应。
相对折射率温漂系数β定义为(dn/dt)rel表示材料在空气等介质中的折射率随温度变化系数。第三透镜L3相对折射率温漂系数β3满足：-9×10 -5≤β3≤9×10 -5，第三透镜L3的焦距为f3，镜头组的有效焦距为f，f3/f＝0.39满足0≤f3/f≤3条件，采用低折射率温漂系数材料和光焦度分配能够获得较小的系统温漂系数。
在实施例2中，第四透镜L4和第五透镜L5的间距为SP4，第一透镜L1物侧顶点位置到第六透镜L6像侧顶点位置的间距为LT，SP4/LT≤0.5，利于降低镜头组立的实施难度。
作为实施例1的扩展，可以选择在第一透镜L1前方(即物侧)设渐晕光阑ST1(未图示)，在第五透镜L5后方(即像侧)有渐晕光阑ST2(未图示)，能够有效减小镜头组的直径。
在实施例2中，光学镜头组的有效焦距为f，第二透镜L2物侧表面的曲率半径为R21，第二透镜L2像侧表面的曲率半径为R22，满足如下条件：|f/R21|+|f/R22|＝8.6，利于校正系统像差，使得光学镜头组的垂轴色差小于1.5um，轴向色差小于10um，畸变小于1％。
表2a示出了本实施例的光学系统的特性的表格，曲率半径、厚度的单位均为毫米(mm)。
表2a
面号 说明 表面类型 曲率半径 厚度 材质 折射率 色散系数
OBJ   平面 无限 无限      
VIG STO 渐晕光阑 非球面 无限 -0.773      
S1 第一透镜 非球面 3.3580 2.100 PLASTIC 1.544 56
S2   非球面 4.8218 0.225      
S3 第二透镜 非球面 4.6570 0.360 PLASTIC 1.65 22.4
S4   非球面 2.6314 0.370      
S5 第三透镜 球面 2.2982 1.157 GLASS 1.49 70.4
S6   球面 12.1668 0.707      
STO 孔径光阑 平面 无限大 0.119      
S7 第四透镜 非球面 -7.4242 0.400 PLASTIC 1.65 22.4
S8   非球面 14.1861 0.453      
S9 第五透镜 非球面 -27.8432 0.782 PLASTIC 1.67 20.4
S10   非球面 -3.7492 0.104      
S11 第六透镜 非球面 -3.9463 0.360 PLASTIC 1.544 56
S12   非球面 30.6675 0.353      
S13 红外滤光片 平面   0.210 GLASS 1.52 64.2
S14   平面 无限 5.000      
S15   平面 无限        
表2b给出了可用于第二实施例中各非球面镜面S1-S12的高次项系数A4、A6、A8和A10。
表2b
面号 K A4 A6 A8 A10
S1 2.769E-01 -9.860E-04 -1.497E-04 -8.492E-06 -3.102E-06
S2 4.350E+00 4.266E-03 -3.149E-03 2.320E-04 -9.858E-05
S3 2.694E+00 -1.851E-02 -2.341E-03 3.658E-04 -7.524E-05
S4 -3.955E+00 -3.858E-03 -4.622E-03 9.610E-04 -1.423E-04
S7 -1.198E+01 2.024E-02 -3.226E-02 1.771E-03 1.613E-03
S8 0 9.374E-02 -2.672E-02 3.463E-03 0
S9 -6.024E+01 5.249E-02 -1.466E-02 1.182E-02 -5.389E-03
S10 -9.667E+00 2.070E-02 -3.383E-02 2.227E-02 -3.202E-03
S11 4.406E+00 2.987E-02 -3.650E-02 2.938E-02 -5.521E-03
S12 -9.407E+01 -2.365E-02 6.634E-03 0 0
表2c给出了本实施例的光学系统的第一透镜L1的物侧表面S1至无穷远物体距离成像面S15于光轴上的距离为TTL、光学镜头组的最大像高ImgH、光学镜头组的有效焦距为f、第一透镜焦距f1、第二透镜焦距f2、第三透镜焦距f3、第四透镜焦距f4、第五透镜焦距f5、第六透镜焦距f6。
表2c
参数 TTL ImgH f f1 f2 f3 f4 f5 f6
数值(mm) 12.7 2.5 14.46 13.43 -10.09 5.58 -7.51 6.41 -6.38
图3b示出了第二实施例的光学系统的轴向球面相差曲线，横轴是光轴上聚焦位置，纵轴是视场，其表示五条不同波长的光线在不同视场的轴向聚焦位置。
图3c示出了第二实施例的光学系统的像散曲线，其表示子午像面弯曲和弧矢像面弯曲，其中曲率较大的实线表示的是子午像面弯曲，曲率较小的虚线表示的是弧矢像面弯曲。
图3d示出了第二实施例的光学系统的畸变曲线，其表示不同视场角对应的畸变大小值。
图3e示出了第二实施例的光学系统的垂轴色差曲线，横轴是像高变化，纵轴是视场，其表示五条不同波长的光线在不同视场角对应的垂轴色差大小。
根据图3b至图3e可知，第二实施例所给出的光学系统能够实现良好的成像品质。
实施例三
如图4a所示，本实施方式的光学镜头组中，，沿着光轴从物侧到像侧依次为孔径光阑STO、第一个透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、第五透镜L5、第六透镜L6，红外滤光元件IRCF、电子感光元件可置于像面。
第一透镜L1具有正光焦度，且为树脂材质，其物侧表面S1近光轴处为凸面，像侧表面S2近光轴处为凸面，均为非球面。
第二透镜L2具有负光焦度，且为树脂材质，其物侧表面S3近光轴处为凹面，像侧表面S4近光轴处为凹面，均为非球面。
第三透镜L3具有正光焦度，且为树脂材质，其物侧表面S5近光轴处为凸面，像侧表面S6近光轴处为凸面，均为球面。
第四透镜L4具有正光焦度，且为玻璃材质，其物侧表面S7近光轴处为凹面，像侧表面S8近光轴处为凹面，均为球面。
第五透镜L5具有负光焦度，且为树脂材质，其物侧表面S9近光轴处为凹面，像侧表面S10近光轴处为凸面，均为非球面。
第六透镜L6具有负光焦度，且为树脂材质，其物侧表面S11近光轴处为凹面，像侧表面S12近光轴处为凸面，均为非球面。
第一透镜L1物侧表面S1至无穷远物体距离成像面S15于光轴上的距离为TTL，光学镜头组的有效焦距为f，其可满足下列条件：TTL/f≤0.94，实现较短TTL，利于光学镜头组的小型化设计，节约终端设备内部空间，利于终端设备薄形化发展。
在实施例3中，第四透镜L4的色散系数(阿贝数)为V4，V4满足15≤V4≤100。通过合理的光焦度分配和色散系数选择，能够校正镜头组的色差。
在实施例3中，温度变化△℃时，f变化量为△f。△f/△℃定义为镜头组的温漂系数，其中温漂系数满足如下条件：-1um/℃≤△f/△℃≤1um/℃，能够改善摄影系统的温漂效应。
相对折射率温漂系数β定义为(dn/dt)rel表示材料在空气等介质中的折射率随温度变化系数。实施例3中的第四透镜L4相对折射率温漂系数β4满足：-9×10 -5≤β4≤9×10 -5，第四透镜的焦距为f4，光学镜头组的有效焦距为f，f4/f＝0.75满足0.1≤f4/f≤3条件，采用低折射率温漂系数材料和光焦度的合理分配减小镜头组的温漂系数。
在实施例3中，第五透镜L5和第六透镜L6的间距为SP5，第一透镜L1物侧顶点位置到第六透镜L6像侧顶点位置的间距为LT，SP5/LT≤0.2，利于降低镜头组立的实施难度。
在实施例3中，光学镜头组的有效焦距为f，第二透镜L2物侧表面的曲率半径为R21，第二透镜L2像侧表面的曲率半径为R22，满足如下条件：|f/R21|+|f/R22|＝1.99，利于校正系统像差，使得光学镜头组的垂轴色差小于1.5um，轴向色差小于10um，畸变小于1％。
结合上述具体实施例，本申请所提供的光学镜头组通过对各透镜的光焦度、材质、面形(凹面或凸面)的限定，结合透镜的色散系数、温漂系数、相对折射率温漂系数、相邻透镜之间间距及各表面曲率半径的范围限定，不但解决的温漂效应问题，还能提升成像效果，且利于校正光学镜头组的综合像差，使得本申请提供的光学镜头组的垂轴色差小于1.5um，轴向色差小于10um，畸变小于1％。
表3a示出了本实施例的光学系统的特性的表格，曲率半径、厚度的单位均为毫米(mm)。
表3a
面号 说明 表面类型 曲率半径 厚度 材质 折射率 色散系数
OBJ   平面 无限 无限      
STO 孔径光阑 平面 无限 -0.5      
S1 第一透镜 非球面 4.599 0.947 PLASTIC 1.5445 55.987
S2   非球面 -16.109 0.100      
S3 第二透镜 非球面 -15.907 0.300 PLASTIC 1.651 21.518
S4   非球面 13.477 0.943      
S5 第三透镜 球面 -27.868 0.501 PLASTIC 1.651 21.518
S6   球面 -9.189 0.100      
S7 第四透镜 球面 11.498 0.801 GLASS 1.5168 64.167
S8   球面 -10.749 0.102      
S9 第五透镜 非球面 -9.252 1.456 PLASTIC 1.5445 55.987
S10   非球面 5.896 1.112      
S11 第六透镜 非球面 16.083 1.698 PLASTIC 1.5445 55.987
S12   非球面 6.636 0.300      
S13 红外滤光片 平面 无限 0.21 GLASS 1.52 64.2
S14   平面 无限 5.00      
S15   平面 无限        
表3b给出了可用于第三实施例中各非球面镜面S1-S12的高次项系数A4和A6。
表3b
面号 K A4 A6
S1 1.924E-010 -1.491E-003 1.306E-004
S2 3.377E-011 3.070E-004 2.890E-004
S3 4.193E-011 1.349E-004 2.514E-004
S4 8.395E-011 8.726E-005 4.237E-004
S5 0 0 0
S6 0 0 0
S7 0 0 0
S8 0 0 0
S9 1.321E-010 8.912E-003 3.154E-004
S10 1.740E-010 1.651E-004 8.713E-004
S11 -3.420E-010 -2.463E-002 -1.490E-003
S12 -3.664E-010 -2.039E-002 1.028E-003
表3c给出了本实施例的光学系统的第一透镜L1的物侧表面S1至无穷远物体距离成像面S15于光轴上的距离为TTL、光学镜头组的最大像高ImgH、光学镜头组的有效焦距为f、第一透镜焦距f1、第二透镜焦距f2、第三透镜焦距f3、第四透镜焦距f4、第五透镜焦距f5、第六透镜焦距f6。
表3c
参数 TTL ImgH f f1 f2 f3 f4 f5 f6
数值(mm) 13.57 2.8 14.50 6.66 -11.07 20.67 10.85 -6.38 -22.08
图4b示出了第三实施例的光学系统的轴向球面相差曲线，横轴是光轴上聚焦位置，纵轴是视场，其表示五条不同波长的光线在不同视场的轴向聚焦位置。
图4c示出了第三实施例的光学系统的像散曲线，其表示子午像面弯曲和弧矢像面弯曲， 其中曲率较大的实线表示的是子午像面弯曲，曲率较小的虚线表示的是弧矢像面弯曲。
图4d示出了第三实施例的光学系统的畸变曲线，其表示不同视场角对应的畸变大小值。
图4e示出了第三实施例的光学系统的垂轴色差曲线，横轴是像高变化，纵轴是视场，其表示五条不同波长的光线在不同视场角对应的垂轴色差大小。
根据图4b至图4e可知，第三实施例所给出的光学系统能够实现良好的成像品质。
结合上述具体实施例，本申请所提供的光学镜头组通过对各透镜的光焦度、材质、面形(凹面或凸面)的限定，结合透镜的色散系数、温漂系数、相对折射率温漂系数、相邻透镜之间间距及各表面曲率半径的范围限定，不但解决的温漂效应问题，还能提升成像效果，且利于校正光学镜头组的综合像差，使得本申请提供的光学镜头组的垂轴色差小于1.5um，轴向色差小于10um，畸变小于1％。
本申请通过将光学镜头组中的至少一个透镜的材质选择为相对折射率温漂系数小于塑料材质的相对折射率温漂系数的第一材质，能够抑制光学镜头组的光学效应，使得光学镜头组的焦距和MTF(Modulation Transfer Function(调制传递函数))等参数对温度不敏感，利于减少音圈马达用于补偿镜头组温漂效应的行程余量或取消摄影系统的温漂效应补偿算法，改善用户体验，能够获得优秀的光学品质。

Claims (20)

  1. 一种光学镜头组，包括多个沿着光轴方向从物侧至像侧依序排列的多个透镜，其特征在于，所述多个透镜中的至少一个透镜的材质为第一材质，所述第一材质的相对折射率温漂系数小于塑料材质的相对折射率温漂系数，所述多个透镜中，从物侧至像侧方向的前三个透镜依次为第一透镜、第二透镜和第三透镜，所述第一透镜为正光焦度，所述第二透镜为负光焦度，所述第三透镜为正光焦度，所述光学镜头组的有效焦距为f，所述第一透镜之物侧表面至成像面于所述光轴上的距离为TTL，TTL/f≦0.96。
  2. 如权利要求1所述的光学镜头组，其特征在于，所述第一材质的相对折射率温漂系数为β，-9×10 -5≤β≤9×10 -5。
  3. 如权利要求2所述的光学镜头组，其特征在于，所述第一材质的相对折射率温漂系数为β，-9×10 -5≤β≤0。
  4. 如权利要求3所述的光学镜头组，其特征在于，所述第一材质为玻璃材质。
  5. 如权利要求2所述的光学镜头组，其特征在于，所述光学镜头组的温漂系数为△f/△℃，-2.6um/℃≤△f/△℃≤2.6um/℃。
  6. 如权利要求5所述的光学镜头组，其特征在于，-1um/℃≤△f/△℃≤1um/℃。
  7. 如权利要求1所述的光学镜头组，其特征在于，所述第二透镜物侧表面的曲率半径为R21，所述第二透镜的像侧表面的曲率半径为R22，|f/R21|+|f/R22|<10。
  8. 如权利要求1所述的光学镜头组，其特征在于，所述多个透镜的数量为六个，分别为从物侧至像侧方向的依次排布的所述第一透镜、所述第二透镜、所述第三透镜、第四透镜、第五透镜和第六透镜，所述光学镜头组还包括渐晕光阑，所述渐晕光阑设置在所述第一透镜的物侧和/或设置在所述第六透镜的像侧。
  9. 如权利要求1所述的光学镜头组，其特征在于，材质为所述第一材质的所述透镜的色散系数为V，15≤V≤100。
  10. 如权利要求1所述的光学镜头组，其特征在于，所述第三透镜的材质为第一材质，所述第三透镜的至少一个表面为球面。
  11. 如权利要求10所述的光学镜头组，其特征在于，所述第三透镜的所述球面表面的球面半径为R，-100mm<R<100mm。
  12. 如权利要求10所述的光学镜头组，其特征在于，所述第三透镜的焦距为f3，满足0.1≤f3/f≤3。
  13. 如权利要求10所述的光学镜头组，其特征在于，所述多个透镜的数量为六个，分别为从物侧至像侧方向的依次排布的所述第一透镜、所述第二透镜、所述第三透镜、第四透镜、第五透镜和第六透镜，所述第四透镜和所述第五透镜的间距为SP4，所述第一透镜物侧顶点位置到所述第六透镜像侧顶点位置的间距为LT，SP42/LT≤0.5。
  14. 如权利要求1所述的光学镜头组，其特征在于，所述多个透镜的数量为六个，分别为从物侧至像侧方向的依次排布的所述第一透镜、所述第二透镜、所述第三透镜、第四透镜、第五透镜和第六透镜，所述第四透镜的材质为第一材质，所述第四透镜的至少一个表面为球面。
  15. 如权利要求14所述的光学镜头组，其特征在于，所述第四透镜的所述球面表面的球面半径为R，-100mm<R<100mm。
  16. 如权利要求14所述的光学镜头组，其特征在于，所述第四透镜的焦距为f4，满足0.1≤f4/f≤3。
  17. 如权利要求14所述的光学镜头组，其特征在于，所述第五透镜和所述第六透镜的间距为SP5，所述第一透镜物侧顶点位置到所述第六透镜像侧顶点位置的间距为LT，SP5/LT≤0.2。
  18. 如权利要求1所述的光学镜头组，其特征在于，所述第一透镜的物侧表面的近光轴处为凸面。
  19. 一种摄像头，其特征在于，包括镜筒和如权利要注1至18任一项所述的光学镜头组，所述光学镜头组安装在所述镜筒内。
  20. 一种终端设备，其特征在于，包括如权利要求19所述的摄像头。
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