WO2021121004A1 - 广角镜头及成像设备 - Google Patents

广角镜头及成像设备 Download PDF

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Publication number
WO2021121004A1
WO2021121004A1 PCT/CN2020/131877 CN2020131877W WO2021121004A1 WO 2021121004 A1 WO2021121004 A1 WO 2021121004A1 CN 2020131877 W CN2020131877 W CN 2020131877W WO 2021121004 A1 WO2021121004 A1 WO 2021121004A1
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WIPO (PCT)
Prior art keywords
lens
wide
angle
angle lens
image
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PCT/CN2020/131877
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English (en)
French (fr)
Inventor
龙涛
陈伟建
张歆越
曾吉勇
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江西联创电子有限公司
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Priority to US17/343,785 priority Critical patent/US20210302704A1/en
Publication of WO2021121004A1 publication Critical patent/WO2021121004A1/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 -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/04—Mounting of cameras operative during drive; Arrangement of controls thereof relative to the vehicle
    • 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
    • G02B13/001—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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • the invention relates to the technical field of optical lenses, in particular to a wide-angle lens and imaging equipment.
  • the vehicle lens has also ushered in rapid development, and the requirements for the lens are also getting higher and higher.
  • An object of the present invention is to provide a wide-angle lens with a small number of lenses to solve the above-mentioned problems.
  • the present invention provides a wide-angle lens that includes a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, and a sixth lens in order from the object side to the image side along the optical axis.
  • the first lens has a negative refractive power, the object side surface is convex, and the image side surface is concave;
  • the second lens has negative refractive power, the object side surface is convex, and the image side surface is concave;
  • the third lens has a negative refractive power, and the object side surface and the image side surface are both concave;
  • the fourth lens has a positive refractive power, and both the object side surface and the image side surface are convex;
  • the fifth lens has a positive refractive power, and the object side surface and the image side surface are both convex;
  • the sixth lens has negative refractive power, the object side and the image side are both concave, and the fifth lens and the sixth lens form a cemented body;
  • the seventh lens has a positive refractive power, and the object side surface and the image side surface are both convex;
  • the first lens and the fourth lens are glass spherical lenses
  • the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic Aspheric lenses, and the optical centers of each lens are on the same straight line.
  • the beneficial effect of the present invention is that the wide-angle lens only needs to use seven glass-plastic hybrid lenses, and the number of lenses is small.
  • the wide-angle lens can operate at -40°C to +105°C. Clear imaging in the temperature range, while controlling low-cost manufacturing, it can also meet the imaging requirements of wide-angle characteristics and high imaging quality.
  • the wide-angle lens provided by the present invention may also have the following additional technical features:
  • the wide-angle lens satisfies the conditional formula:
  • h represents the image height corresponding to the maximum half angle of view of the wide-angle lens
  • f represents the effective focal length of the wide-angle lens
  • the wide-angle lens satisfies the conditional formula:
  • HFOV represents the maximum half-field angle of the wide-angle lens
  • D represents the maximum clear aperture of the object side of the first lens
  • h represents the image height corresponding to the maximum half-field angle of the wide-angle lens.
  • the wide-angle lens satisfies the conditional formula:
  • TTL represents the total optical length of the wide-angle lens
  • HFOV represents the maximum half-field angle of the wide-angle lens
  • h represents the image height corresponding to the maximum half-field angle of the wide-angle lens.
  • the wide-angle lens satisfies the conditional formula:
  • (dN/dT)2 represents the temperature coefficient of refractive index of the second lens at 20°C
  • (dN/dT)3 represents the temperature coefficient of refractive index of the third lens at 20°C
  • (dN/dT )5 represents the refractive index temperature coefficient of the fifth lens at 20°C
  • (dN/dT)6 represents the refractive index temperature coefficient of the sixth lens at 20°C
  • (dN/dT)7 represents the first
  • f2 represents the effective focal length of the second lens
  • f3 represents the effective focal length of the third lens
  • f5 represents the effective focal length of the fifth lens
  • f6 represents the first lens.
  • the effective focal length of the six lenses, f7 represents the effective focal length of the seventh lens.
  • the wide-angle lens satisfies the conditional formula:
  • T23 represents the on-axis air gap between the first lens and the second lens
  • T45 represents the on-axis air gap between the second lens and the third lens
  • T10 represents the object side of the first lens The on-axis distance from the diaphragm surface.
  • the wide-angle lens satisfies the conditional formula:
  • R31 represents the radius of curvature of the object side surface of the third lens
  • R72 represents the radius of curvature of the image side surface of the seventh lens
  • the wide-angle lens satisfies the conditional formula:
  • D5 represents the central thickness of the fifth lens
  • E5 represents the edge thickness of the fifth lens
  • D6 represents the central thickness of the sixth lens
  • E6 represents the edge thickness of the sixth lens
  • the wide-angle lens satisfies the conditional formula:
  • V1 represents the dispersion coefficient of the first lens
  • V2 represents the dispersion coefficient of the second lens
  • V3 represents the dispersion coefficient of the third lens
  • V4 represents the dispersion coefficient of the fourth lens. Represents the optical power of the first lens
  • the wide-angle lens satisfies the conditional formula:
  • V5 represents the dispersion coefficient of the fifth lens
  • V6 represents the dispersion coefficient of the sixth lens
  • V7 represents the dispersion coefficient of the seventh lens
  • the wide-angle lens satisfies the conditional formula:
  • ⁇ CT represents the total thickness of the first lens to the seventh lens on the optical axis
  • TTL represents the total optical length of the wide-angle lens
  • the present invention provides an imaging device including the wide-angle lens and imaging element provided in the first aspect, and the imaging element is used to convert an optical image formed by the wide-angle lens into an electrical signal.
  • FIG. 1 is a schematic diagram of the structure of a wide-angle lens of Embodiment 1 of the present invention
  • Embodiment 2 is a field curvature diagram of the wide-angle lens of Embodiment 1 of the present invention, in which the horizontal axis in the figure represents the offset (unit: millimeter), and the vertical axis represents the field of view angle (unit: degree);
  • FIG. 3 is a defocus curve diagram of the central field of view of the wide-angle lens in embodiment 1 of the present invention at a low temperature of -40°C, where the horizontal axis in the figure represents the focus shift (unit: millimeter), and the vertical axis represents the resolution;
  • Embodiment 5 is a field curvature diagram of a wide-angle lens in Embodiment 2 of the present invention.
  • Fig. 6 is a defocus curve diagram of the central field of view of the wide-angle lens in the embodiment 2 of the present invention at a low temperature of -40°C;
  • Fig. 7 is a defocus curve diagram of the central field of view of the wide-angle lens in the embodiment 2 of the present invention at a high temperature of 105°C;
  • Embodiment 8 is a field curvature diagram of a wide-angle lens in Embodiment 3 of the present invention.
  • Fig. 9 is a defocus curve diagram of the central field of view of the wide-angle lens in the embodiment 3 of the present invention at a low temperature of -40°C;
  • FIG. 10 is a graph showing the defocus curve of the central field of view of the wide-angle lens in the embodiment 3 of the present invention at a high temperature of 105°C;
  • FIG. 11 is a schematic structural diagram of an imaging device in Embodiment 4 of the present invention.
  • FIG. 1 is a structural diagram of a wide-angle lens provided by an embodiment of the present invention.
  • the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, and a first lens L1, a second lens L2, a third lens L3, and a second lens.
  • the four lens L4, the stop ST, the fifth lens L5, the sixth lens L6, the seventh lens L7, the filter G1 and the imaging surface S16 have the following characteristics:
  • the first lens L1 has a negative refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
  • the second lens L2 has a negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;
  • the third lens L3 has negative refractive power, and the object side surface S5 and the image side surface S6 are both concave;
  • the fourth lens L4 has a positive refractive power, and the object side surface S7 and the image side surface S8 are both convex;
  • the fifth lens L5 has a positive refractive power, and the object side surface S9 and the image side surface S10 are both convex;
  • the sixth lens L6 has negative refractive power, the object side surface S10 and the image side surface S11 are both concave, and the fifth lens L5 and the sixth lens L6 form a cemented body;
  • the seventh lens L7 has a positive refractive power, and the object side surface S12 and the image side surface S13 are both convex;
  • the stop ST is provided between the fourth lens L4 and the fifth lens L5.
  • the filter G1 is disposed between the seventh lens L7 and the imaging surface S16, and the filter G1 can be used to selectively filter part of the light, thereby optimizing the imaging result.
  • the imaging plane S16 may be a plane where light incident from the object side passes through a wide-angle lens and forms an image on the image side.
  • the first lens L1 and the fourth lens L4 are glass spherical lenses
  • the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all plastic aspheric lenses, and each lens The optical centers of are all located on the same straight line.
  • the wide-angle lens satisfies the conditional formula:
  • h represents the image height corresponding to the maximum half angle of view of the wide-angle lens
  • f represents the effective focal length of the wide-angle lens. Satisfying the conditional formula (1) can realize the imaging of a larger object side space by the photosensitive element, which is beneficial to wide-angle.
  • the wide-angle lens satisfies the conditional formula:
  • HFOV represents the maximum half-field angle of the wide-angle lens
  • D represents the maximum clear aperture of the object side of the first lens
  • h represents the image height corresponding to the maximum half-field angle of the wide-angle lens.
  • the wide-angle lens satisfies the conditional formula:
  • TTL represents the total optical length of the wide-angle lens
  • HFOV represents the maximum half-field angle of the wide-angle lens
  • h represents the image height corresponding to the maximum half-field angle of the wide-angle lens.
  • the wide-angle lens satisfies the conditional formula:
  • (dN/dT)2 represents the temperature coefficient of refractive index of the second lens at 20°C
  • (dN/dT)3 represents the temperature coefficient of refractive index of the third lens at 20°C
  • (dN/dT)5 represents the temperature coefficient of refractive index of the third lens at 20°C.
  • (dN/dT)6 represents the temperature coefficient of refractive index of the sixth lens at 20°C
  • (dN/dT)7 represents the refractive index temperature of the seventh lens at 20°C
  • the coefficient, f2 represents the effective focal length of the second lens
  • f3 represents the effective focal length of the third lens
  • f5 represents the effective focal length of the fifth lens
  • f6 represents the effective focal length of the sixth lens
  • f7 represents the effective focal length of the seventh lens.
  • Satisfying conditional formulas (4) and (5) effectively solves the problem of lens focus shift caused by the large thermal expansion coefficient of plastic materials, effectively compensates for the effect of temperature changes on lens focal length, and improves lens resolution in high and low temperature environments Under the stability, the lens has good thermal stability.
  • the wide-angle lens satisfies the conditional formula:
  • T23 represents the axial air separation between the first lens and the second lens
  • T45 represents the axial air separation between the second lens and the third lens
  • T10 represents the axial distance between the object side surface of the first lens and the diaphragm surface.
  • the wide-angle lens satisfies the conditional formula:
  • R31 represents the radius of curvature of the object side surface of the third lens
  • R72 represents the radius of curvature of the image side surface of the seventh lens.
  • the conditional formula (7) is satisfied, and the curvature radius relationship between the object side surface of the first lens and the second lens can be reasonably arranged, and the field curvature and distortion of the imaging system can be well balanced.
  • the wide-angle lens satisfies the conditional formula:
  • D5 represents the central thickness of the fifth lens
  • E5 represents the edge thickness of the fifth lens
  • D6 represents the central thickness of the sixth lens
  • E6 represents the edge thickness of the sixth lens.
  • the wide-angle lens satisfies the conditional formula:
  • V1 represents the dispersion coefficient of the first lens
  • V2 represents the dispersion coefficient of the second lens
  • V3 represents the dispersion coefficient of the third lens
  • V4 represents the dispersion coefficient of the fourth lens.
  • the conditional formula (10) is satisfied, and the chromatic aberration of the system can be well corrected and the imaging quality can be improved through reasonable distribution and balance of the dispersion relationship between the lenses.
  • the wide-angle lens satisfies the conditional formula:
  • V5 represents the dispersion coefficient of the fifth lens
  • V6 represents the dispersion coefficient of the sixth lens
  • V7 represents the dispersion coefficient of the seventh lens.
  • the conditional formula (11) is satisfied, and the chromatic aberration of the system can be well corrected and the imaging quality can be improved through reasonable distribution and balance of the dispersion relationship between the lenses.
  • the wide-angle lens satisfies the conditional formula:
  • ⁇ CT represents the total thickness of the first lens to the seventh lens on the optical axis
  • TTL represents the total optical length of the wide-angle lens.
  • the surface shape of the aspheric lens satisfies the following equation:
  • Z represents the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis direction;
  • K is the conic coefficient conic;
  • B, C, D, E, F represent the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.
  • the aperture of the wide-angle lens is not more than 2.2, which can achieve good imaging quality in bright and dim environments, and meet the imaging requirements of darker outdoor environments.
  • Table 1-1 shows the radius of curvature, thickness, refractive index, and Abbe number of each lens of the wide-angle lens in Example 1;
  • Table 1-2 shows the aspherical surface of each aspheric lens of the wide-angle lens in Example 1. coefficient.
  • Figure 2 shows the field curvature of the wide-angle lens in Example 1. It can be seen from Figure 2 that the field curvature of the wide-angle lens is within ⁇ 0.1mm, indicating that field curvature and astigmatism are well obtained. Correction.
  • Figures 4 and 5 show the defocus curve of the central field of view when the wide-angle lens in Example 1 is at a low temperature of -40°C and the defocus curve of the central field of view at a high temperature of 105°C. From Figures 4 and It can be seen in Figure 5 that the difference between the peak positions of the defocus curves in the two figures is less than 5 microns, indicating that the wide-angle lens has good thermal stability.
  • the structure of the wide-angle lens of this embodiment is basically the same as that of Embodiment 1.
  • the difference is that the radius of curvature and material selection of each lens in the wide-angle lens of this embodiment are different.
  • Table 2-1 and Table 2-2 show the specific differences.
  • Table 2-1 shows the radius of curvature, thickness, refractive index, and Abbe number of each lens of the wide-angle lens of Example 2
  • Table 2-2 shows the aspherical surface of each aspheric lens of the wide-angle lens of this example. coefficient.
  • Figure 5 shows the field curvature diagram of the wide-angle lens in Example 2. It can be seen from Figure 5 that the field curvature values of the wide-angle lens are within ⁇ 0.1mm, indicating that field curvature and astigmatism are well obtained. Correction.
  • Figures 6 and 7 show the defocus curve of the central field of view when the wide-angle lens in Example 2 is at a low temperature of -40°C and the defocus curve of the central field of view at a high temperature of 105°C. From Figures 6 and As can be seen in Figure 7, the difference between the peak positions of the defocus curves in the two figures is less than 5 microns, indicating that the wide-angle lens has good thermal stability.
  • the structure of the wide-angle lens in this embodiment is basically the same as that in Embodiment 1.
  • the difference lies in that the radius of curvature and material selection of each lens in the wide-angle lens in this embodiment are different.
  • the specific differences can be seen in Table 3-1 and Table 3-2.
  • Figure 8 shows the field curvature diagram of the wide-angle lens in Example 3. It can be seen from Figure 8 that the field curvature of the wide-angle lens is within ⁇ 0.1mm, indicating that field curvature and astigmatism are well obtained. Correction.
  • Figures 9 and 10 show the defocus curve of the central field of view when the wide-angle lens in Example 3 is at a low temperature of -40°C and the defocus curve of the central field of view at a high temperature of 105°C. From Figures 9 and It can be seen in Figure 10 that the difference between the peak positions of the defocus curves in the two figures is less than 5 microns, indicating that the wide-angle lens has good thermal stability.
  • Table 4 shows the above three embodiments and their corresponding optical characteristics, including the effective focal length f of the wide-angle lens, the total optical length TTL, the maximum half-field angle HFOV, the image height h corresponding to the maximum half-field angle, and the aperture number F/NO , And the value corresponding to each of the previous conditional expressions.
  • the wide-angle lens in this application uses seven lenses. By reasonably distributing the refractive power, surface shape, center thickness of each lens, and the on-axis distance between each lens, the lens achieves good quality while having At least one beneficial effect such as miniaturization, low sensitivity, and good processability.
  • the first lens L1 and the fourth lens L4 in the wide-angle lens of the present application are glass lenses
  • the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic non-plastic lenses. Spherical lens.
  • the wide-angle lens of the present application can effectively correct lens aberrations by optimizing the positive and negative refractive indexes of each lens, and at the same time overcomes the defect that the plastic lens has a large expansion coefficient and is likely to cause focus drift in high and low temperature environments.
  • the use of plastic aspheric lenses can effectively correct lens aberrations and improve the resolution of the entire lens group; in addition, the combined use of glass and plastic materials effectively reduces manufacturing costs and improves product competitiveness.
  • FIG. 11 a schematic structural diagram of an imaging device 200 provided in this embodiment, which includes the wide-angle lens (such as the wide-angle lens 100) and the imaging element 210 in any of the above embodiments.
  • the imaging element 210 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or a CCD (Charge Coupled Device, charge coupled device) image sensor.
  • CMOS Complementary Metal Oxide Semiconductor
  • CCD Charge Coupled Device, charge coupled device
  • the imaging device 200 may be a sports camera, a panoramic camera, a vehicle-mounted camera, or any other electronic device loaded with an optical imaging lens.
  • the imaging device 200 provided in this embodiment includes a wide-angle lens 100. Since the wide-angle lens has the advantages of miniaturization, low sensitivity, and good thermal stability, the imaging device 200 has the advantages of miniaturization, low sensitivity, and good thermal stability. Good wait for advantages.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

一种广角镜头及成像设备，沿光轴从物侧到像侧依序包括：第一透镜（L1），其物侧面（S1）为凸面，像侧面（S2）为凹面；第二透镜（L2），其物侧面（S3）为凸面，像侧面（S4）为凹面；第三透镜（L3），其物侧面（S5）和像侧面（S6）均为凹面；第四透镜（L4），其物侧面（S7）和像侧面（S8）均为凸面；第五透镜（L5），其物侧面（S9）和像侧面（S10）均为凸面；第六透镜（L6），其物侧面（S10）和像侧面（S11）均为凹面，且第五透镜（L5）与第六透镜（L6）组成胶合体；第七透镜（L7），其物侧面（S12）和像侧面（S13）均为凸面。该广角镜头采用七片玻塑混合镜片搭配，透镜数量少，通过各面型的合理控制，以及材料和光焦度的合理组合，能够在-40℃～+105℃温度范围内清晰成像，在控制低成本制造的同时，又能满足广角特性以及良好的热稳定性好等优点。

Description

广角镜头及成像设备
相关申请的交叉引用
本申请要求于2019年12月18日提交的申请号为201911310977.2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
本发明涉及光学镜头技术领域，特别是涉及一种广角镜头及成像设备。
背景技术
随着科技的发展，车载镜头作为自动驾驶辅助系统的关键部件也迎来了较快发展，对该镜头的要求也越来越高。
随着感光耦合元件(CCD)或互补性氧化金属半导体元件(CMOS)等常用感光元件性能的提高及尺寸的减小，对于相配套的镜头的高成像品质及小型化提出了更高的要求。车载成像镜头要求具有良好的热稳定性及广角特性。
现有的车载成像镜头大多是通过增加更多的透镜来实现广角特性，一般为9片以上的透镜，不利于小型化、低成本，还会使像差变大，并导致成像质量变差，且由于车载镜头工作环境温度变化较大，容易使镜头出现因温度变化带来的焦点偏移问题。
发明内容
本发明的一个目的在于提出一种透镜数量少的广角镜头，用于解决上述问题。
第一方面，本发明提供一种广角镜头，沿光轴从物侧到像侧依序包括第一透镜、第二透镜、第三透镜、第四透镜、光阑、第五透镜、第六透镜、第七透镜、以及滤光片，
所述第一透镜具有负光焦度，其物侧面为凸面，像侧面为凹面；
所述第二透镜具有负光焦度，其物侧面为凸面，像侧面为凹面；
所述第三透镜具有负光焦度，其物侧面和像侧面均为凹面；
所述第四透镜具有正光焦度，其物侧面和像侧面均为凸面；
所述第五透镜具有正光焦度，其物侧面和像侧面均为凸面；
所述第六透镜具有负光焦度，其物侧面和像侧面均为凹面，且所述第五透镜与所述第六透镜组成胶合体；
所述第七透镜具有正光焦度，其物侧面和像侧面均为凸面；
其中，所述第一透镜和所述第四透镜为玻璃球面镜片，所述第二透镜、所述第三透镜、所述第五透镜、所述第六透镜和所述第七透镜均为塑胶非球面镜片，且各透镜的光学中心均位于同一直线上。
本发明的有益效果是：该广角镜头只需采用七片玻塑混合镜片搭配，透镜数量少，通过各面型的合理控制，以及材料和光焦度的合理组合，能够在-40℃～+105℃温度范围内清晰成像，在控制低成本制造的同时，又能满足广角特性以及高成像品质的成像要求。
另外，根据本发明提供的广角镜头，还可以具有如下附加的技术特征：
进一步地，所述广角镜头满足条件式：
1.55<h/f<1.65；
其中，h表示所述广角镜头的最大半视场角所对应的像高，f表示所述广角镜头的有效焦距。
进一步地，所述广角镜头满足条件式：
0.04/°<D/h/HFOV<0.06/°；
其中，HFOV表示所述广角镜头的最大半视场角，D表示所述第一透镜的物侧面的最大通光口径，h表示所述广角镜头的最大半视场角所对应的像高。
进一步地，所述广角镜头满足条件式：
0.06/°<TTL/h/HFOV<0.07/°；
其中，TTL表示所述广角镜头的光学总长，HFOV表示所述广角镜头的最大半视场角，h表示所述广角镜头的最大半视场角所对应的像高。
进一步地，所述广角镜头满足条件式：
15×10 -6/(℃*mm)<[(dN/dT)2+(dN/dT)3]/(f2+f3)<20×10 -6/(℃*mm)；-70×10 -6/(℃*mm)<[(dN/dT)5+(dN/dT)6+(dN/dT)7]/(f5+f6+f7)<-50×10 -6/(℃*mm)；
其中，(dN/dT)2表示所述第二透镜在20℃时的折射率温度系数，(dN/dT)3表示所述第三透镜在20℃时的折射率温度系数，(dN/dT)5表示所述第五透镜在20℃时的折射率温度系数，(dN/dT)6表示所述第六透镜在20℃时的折射率温度系数，(dN/dT)7表示所述第七透镜在20℃时的折射率温度系数，f2表示所述第二透镜的有效焦距，f3表示所述第三透镜的有效焦距，f5表示所述第五透镜的有效焦距，f6表示所述第六透镜的有效焦距，f7表示所述第七透镜的有效焦距。
进一步地，所述广角镜头满足条件式：
0.4<(T23+T45)/T10<0.45；
其中，T23表示所述第一透镜和所述第二透镜的轴上空气间隔，T45表示所述第二透镜和所述第三透镜的轴上空气间隔，T10表示所述第一透镜的物侧面与所述光阑面之间的轴上距离。
进一步地，所述广角镜头满足条件式：
0.2<R31/R72<0.65；
其中，R31表示所述第三透镜物侧面的曲率半径，R72表示所述第七透镜像侧面的曲率半径。
进一步地，所述广角镜头满足条件式：
1.9<D5/E5<2.15；
0.47<D6/E6<0.52；
其中，D5表示所述第五透镜的中心厚度，E5表示所述第五透镜的边缘厚度，D6表示所述第六透镜的中心厚度，E6表示所述第六透镜的边缘厚度。
进一步地，所述广角镜头满足条件式：
Figure PCTCN2020131877-appb-000001
其中，V1表示所述第一透镜的色散系数，V2表示所述第二透镜的色散系数，V3表示所述第三透镜的色散系数，V4表示所述第四透镜的色散系数，
Figure PCTCN2020131877-appb-000002
表示所述第一透镜的光焦度，
Figure PCTCN2020131877-appb-000003
表示所述第二透镜的光焦度，
Figure PCTCN2020131877-appb-000004
表示所述第三透镜的光焦度，
Figure PCTCN2020131877-appb-000005
表示所述第四透镜的光焦度。
进一步地，所述广角镜头满足条件式：
Figure PCTCN2020131877-appb-000006
其中，V5表示所述第五透镜的色散系数，V6表示所述第六透镜的色散系数，V7表示所述第七透镜的色散系数，
Figure PCTCN2020131877-appb-000007
表示所述第五透镜的光焦度，
Figure PCTCN2020131877-appb-000008
表示所述第六透镜的光焦度，
Figure PCTCN2020131877-appb-000009
表示所述第七透镜的光焦度。
进一步地，所述广角镜头满足条件式：
0.5<∑CT/TTL<0.6；
其中，∑CT表示所述第一透镜至所述第七透镜分别于光轴上的厚度总和，TTL表示所述广角镜头的光学总长。
第二方面，本发明提供了一种成像设备，包括第一方面提供的广角镜头及成像元件，成像元件用于将广角镜头形成的光学图像转换为电信号。
本发明的附加方面和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
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是本发明实施例1的广角镜头的结构示意图；
图2是本发明实施例1的广角镜头的场曲图，其中，图中横轴表示偏移量(单位：毫米)，纵轴表示视场角(单位：度)；
图3为本发明实施例1中广角镜头在低温-40℃时的中心视场离焦曲线图，其中，图中横轴表示焦点偏移量(单位：毫米)，纵轴表示解像力；
图4为本发明实施例1中广角镜头在高温105℃时的中心视场离焦曲线图；
图5为本发明实施例2中广角镜头的场曲图；
图6为本发明实施例2中广角镜头在低温-40℃时的中心视场离焦曲线图；
图7为本发明实施例2中广角镜头在高温105℃时的中心视场离焦曲线图；
图8为本发明实施例3中广角镜头的场曲图；
图9为本发明实施例3中广角镜头在低温-40℃时的中心视场离焦曲线图；
图10为本发明实施例3中广角镜头在高温105℃时的中心视场离焦曲线图；
图11为本发明实施例4中成像设备的结构示意图；
具体实施方式
为使本发明的目的、特征和优点能够更加明显易懂，下面结合附图对本发明的具体实施方式做详细的说明。附图中给出了本发明的若干实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容更加透彻全面。
实施例1
请参阅图1，所示为本发明实施例提供的一种广角镜头的结构图，该广角镜头沿光轴从物侧到像侧依次包括第一透镜L1、第二透镜L2、第三透镜L3、第四透镜L4、光阑ST、第五透镜L5、第六透镜L6、第七透镜L7、滤光片G1和成像面S16，具有如下特征：
第一透镜L1具有负光焦度，其物侧面S1为凸面，像侧面S2为凹面；
第二透镜L2具有负光焦度，其物侧面S3为凸面，像侧面S4为凹面；
第三透镜L3具有负光焦度，其物侧面S5和像侧面S6均为凹面；
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具有正光焦度，其物侧面S9和像侧面S10均为凸面；
第六透镜L6具有负光焦度，其物侧面S10和像侧面S11均为凹面，且第五透镜L5与第六透镜L6组成胶合体；
第七透镜L7具有正光焦度，其物侧面S12和像侧面S13均为凸面；
光阑ST设置于第四透镜L4和第五透镜L5之间。
应当指出的是，滤光片G1设置于第七透镜L7与成像面S16之间，该滤光片G1可用于选择性地对部分光进行过滤，从而优化成像结果。本实施例中，成 像面S16可以是由物侧入射的光，经过广角镜头在像侧成像的平面。
其中，第一透镜L1和第四透镜L4为玻璃球面镜片，第二透镜L2、第三透镜L3、第五透镜L5、第六透镜L6和第七透镜L7均为塑胶非球面镜片，且各透镜的光学中心均位于同一直线上。
在本实施例中，广角镜头满足条件式：
1.55<h/f<1.65；        (1)
其中，h表示广角镜头的最大半视场角所对应的像高，f表示广角镜头的有效焦距。满足条件式(1)，能够实现感光元件对较大的物侧空间的成像，有利于广角化。
更进一步地，广角镜头满足条件式：
0.04<D/h/HFOV<0.06；         (2)
其中，HFOV表示广角镜头的最大半视场角，D表示第一透镜的物侧面的最大通光口径，h表示广角镜头的最大半视场角所对应的像高。满足条件式(2)，可实现镜头前端的小口径。
另外，广角镜头满足条件式：
0.06<TTL/h/HFOV<0.07；         (3)
其中，TTL表示广角镜头的光学总长，HFOV表示广角镜头的最大半视场角，h表示广角镜头的最大半视场角所对应的像高。满足条件式(3)，可实现镜头的小型化，并保证在同一视场角的同一成像面下镜头的光学总长更短。
更进一步地，广角镜头满足条件式：
15×10 -6<[(dN/dT)2+(dN/dT)3]/(f2+f3)<20×10 -6；     (4)
-70×10 -6<[(dN/dT)5+(dN/dT)6+(dN/dT)7]/(f5+f6+f7)<-50×10 -6；    (5)
其中，(dN/dT)2表示第二透镜在20℃时的折射率温度系数，(dN/dT)3表示第三透镜在20℃时的折射率温度系数，(dN/dT)5表示第五透镜在20℃时的折射率温度系数，(dN/dT)6表示第六透镜在20℃时的折射率温度系数，(dN/dT)7表示第七透镜在20℃时的折射率温度系数，f2表示第二透镜的有效焦距，f3表示第三透镜的有效焦距，f5表示第五透镜的有效焦距，f6表示第六透镜的有效焦 距，f7表示第七透镜的有效焦距。满足条件式(4)和(5)，有效的解决了因塑胶材料热膨胀系数较大导致的镜头焦点偏移的问题，有效补偿了温度变化对镜头焦距的影响，提升镜头解析力在高低温环境下的稳定性，使镜头具有很好的热稳定性。
另外，广角镜头满足条件式：
0.4<(T23+T45)/T10<0.45；         (6)
其中，T23表示第一透镜和第二透镜的轴上空气间隔，T45表示第二透镜和第三透镜的轴上空气间隔，T10表示第一透镜的物侧面与光阑面之间的轴上距离。满足条件式(6)，有利于合理分配广角镜头前端的光线偏转角，使整个系统具有广角特性。
另外，广角镜头满足条件式：
0.2<R31/R72<0.65；         (7)
其中，R31表示第三透镜物侧面的曲率半径，R72表示第七透镜像侧面的曲率半径。满足条件式(7)，通过合理的配布第一透镜和第二透镜的物侧面之间的曲率半径关系，能够很好的平衡成像系统的场曲和畸变。
更进一步地，广角镜头满足条件式：
1.9<D5/E5<2.15；          (8)
0.47<D6/E6<0.52；         (9)
其中，D5表示第五透镜的中心厚度，E5表示第五透镜的边缘厚度，D6表示第六透镜的中心厚度，E6表示第六透镜的边缘厚度。满足条件式(8)和(9)，通过合理控制第五透镜和第六透镜的中心厚度与边缘厚度之比，能够很好的降低镜片加工难度及生产成本，同时很好的控制边缘视场热稳定性与中心视场相一致，有效降低系统的焦点漂移。
另外，广角镜头满足条件式：
Figure PCTCN2020131877-appb-000010
其中，V1表示第一透镜的色散系数，V2表示第二透镜的色散系数，V3表示第三透镜的色散系数，V4表示第四透镜的色散系数，
Figure PCTCN2020131877-appb-000011
表示第一透镜的光焦 度，
Figure PCTCN2020131877-appb-000012
表示第二透镜的光焦度，
Figure PCTCN2020131877-appb-000013
表示第三透镜的光焦度，
Figure PCTCN2020131877-appb-000014
表示第四透镜的光焦度。满足条件式(10)，通过合理的分配和平衡各透镜之间的色散关系，能够很好的校正系统的色差，提高成像质量。
更进一步地，广角镜头满足条件式：
Figure PCTCN2020131877-appb-000015
其中，V5表示第五透镜的色散系数，V6表示第六透镜的色散系数，V7表示第七透镜的色散系数，
Figure PCTCN2020131877-appb-000016
表示第五透镜的光焦度，
Figure PCTCN2020131877-appb-000017
表示第六透镜的光焦度，
Figure PCTCN2020131877-appb-000018
表示第七透镜的光焦度。满足条件式(11)，通过合理的分配和平衡各透镜之间的色散关系，能够很好的校正系统的色差，提高成像质量。
另外，广角镜头满足条件式：
0.5<∑CT/TTL<0.6；         (12)
其中，∑CT表示第一透镜至第七透镜分别于光轴上的厚度总和，TTL表示广角镜头的光学总长。满足条件式(12)，能够合理配置透镜的中心厚度总和，有效缩短镜头的光学总长，实现镜头的小型化和广角化。
在本实施例中，非球面透镜的面型满足如下等式：
Figure PCTCN2020131877-appb-000019
其中，Z表示非球面沿光轴方向在高度为h的位置时，距非球面顶点的距离矢高；c表示非球面的近轴曲率，c＝1/R(即，近轴曲率c为曲率半径的倒数)；K为圆锥系数conic；B、C、D、E、F分别表示四阶、六阶、八阶、十阶，十二阶曲面系数。
另外，在一些实施例中，广角镜头的光圈数不大于2.2，能够实现在明亮和昏暗环境下的良好成像质量，满足户外较暗环境的成像需求。
本实施例中广角镜头的各透镜参数具体取值见表1-1和表1-2。其中，表1-1示出了实施例1中广角镜头的各透镜的曲率半径、厚度、折射率以及阿贝数；表1-2示出了实施例1的广角镜头的各非球面透镜的非球面系数。
表1-1
Figure PCTCN2020131877-appb-000020
表1-2
面号 B C D E F
S3 -3.3567E-03 2.1134E-04 -1.1794E-05 1.7344E-07 0.0000E+00
S4 -5.1991E-03 6.8317E-05 -4.6970E-05 -1.1049E-06 0.0000E+00
S5 -6.7625E-03 1.1435E-03 1.9608E-05 -7.2423E-06 0.0000E+00
S6 -2.4585E-03 9.3255E-04 1.0308E-04 -1.3512E-05 0.0000E+00
S9 1.3044E-03 1.1589E-03 -6.3917E-04 2.3304E-04 -4.2659E-05
S10 -1.1265E-02 -3.7485E-03 2.7129E-03 -1.4161E-03 2.9924E-04
S11 3.6392E-03 2.5294E-03 -7.8983E-04 8.2391E-05 -5.1603E-07
S12 4.4579E-03 3.1302E-04 -1.3111E-04 9.4783E-06 -2.7459E-07
S13 -5.0794E-03 2.9094E-04 1.1652E-04 -1.9354E-05 6.7205E-07
请参阅图2，所示为实施例1中广角镜头的场曲图，由图2可以看出，该广角镜头的场曲值均位于±0.1mm范围内，表明场曲和像散都得到了很好的校正。 请参阅图4和图5，所示分别为实施例1中的广角镜头处于低温-40℃时的中心视场离焦曲线及在高温105℃时的中心视场离焦曲线图，从图4和图5中可以看出，两图中的离焦曲线峰值位置之差小于5微米，表明了该广角镜头具有良好的热稳定性。
实施例2
本实施例的广角镜头的结构与实施例1基本一致，不同之处在于，本实施例广角镜头中各透镜的曲率半径、材料选择不同，具体不同可见表2-1和表2-2。其中，表2-1示出了实施例2的广角镜头的各透镜的曲率半径、厚度、折射率以及阿贝数，表2-2示出了本实施例的广角镜头的各非球面透镜的非球面系数。
表2-1
Figure PCTCN2020131877-appb-000021
表2-2
Figure PCTCN2020131877-appb-000022
Figure PCTCN2020131877-appb-000023
请参阅图5，所示为实施例2中广角镜头的场曲图，由图5可以看出，该广角镜头的场曲值均位于±0.1mm范围内，表明场曲和像散都得到了很好的校正。请参阅图6和图7，所示分别为实施例2中的广角镜头处于低温-40℃时的中心视场离焦曲线及在高温105℃时的中心视场离焦曲线图，从图6和图7中可以看出，两图中的离焦曲线峰值位置之差小于5微米，表明了该广角镜头具有良好的热稳定性。
实施例3
本实施例中广角镜头的结构与实施例1基本一致，不同之处在于，本实施例的广角镜头中各透镜的曲率半径、材料选择不同，具体不同可见表3-1、表3-2。
表3-1
Figure PCTCN2020131877-appb-000024
Figure PCTCN2020131877-appb-000025
表3-2
面号 B C D E F
S3 -4.9262E-03 2.1156E-04 -6.1225E-06 0.0000E+00 0.0000E+00
S4 -3.3362E-03 -7.6378E-05 1.7632E-05 0.0000E+00 0.0000E+00
S5 3.3041E-03 3.8346E-04 -2.1757E-05 0.0000E+00 0.0000E+00
S6 7.1059E-03 4.5653E-04 -4.9175E-06 0.0000E+00 0.0000E+00
S9 5.5869E-03 2.2551E-03 -1.7561E-03 6.0095E-04 -7.7893E-05
S10 -1.6305E-02 9.1390E-03 -9.6540E-04 -9.9822E-04 2.4350E-04
S11 -3.8033E-03 2.1319E-03 -3.5105E-04 2.0145E-05 1.1019E-06
S12 2.7640E-03 -1.9594E-04 7.8217E-06 -3.5814E-07 -3.3158E-07
S13 -1.5217E-03 2.7700E-04 2.0448E-05 -8.2567E-06 2.1292E-07
请参阅图8，所示为实施例3中广角镜头的场曲图，由图8可以看出，该广角镜头的场曲值均位于±0.1mm范围内，表明场曲和像散都得到了很好的校正。请参阅图9和图10，所示分别为实施例3中的广角镜头处于低温-40℃时的中心视场离焦曲线及在高温105℃时的中心视场离焦曲线图，从图9和图10中可以看出，两图中的离焦曲线峰值位置之差小于5微米，表明了该广角镜头具有良好的热稳定性。表4是上述3个实施例及其对应的光学特性，包括广角镜头的有效焦距f、光学总长TTL、最大半视场角HFOV、最大半视场角所对应的像高h和光圈数F/NO，以及与前面每个条件式对应的数值。
表4
Figure PCTCN2020131877-appb-000026
Figure PCTCN2020131877-appb-000027
本申请中的广角镜头采用了七片透镜，通过合理分配各透镜的光焦度、面型、各透镜的中心厚度以及各透镜之间的轴上间距等，使得镜头在实现良好质量的同时，具有小型化、低敏感度以及良好的加工性等至少一个有益效果。其次，本申请的广角镜头中的第一透镜L1和第四透镜L4均为玻璃透镜，第二透镜L2，第三透镜L3，第五透镜L5，第六透镜L6及第7透镜L7均为塑胶非球面透镜。本申请的广角镜头通过优化配置各个透镜的正负折射率，使镜头像差得到有效的校正，同时克服了塑胶材质的透镜，由于其膨胀系数大，在高低温环境下容易造成焦点漂移的缺陷。塑胶非球面透镜的使用，可以有效矫正镜头的像差，提高整组镜头的解像力；另外，玻璃和塑胶材料的结合使用，有效的降低了制造成本，提高了产品竞争力。
实施例4
本实施例提供的一种成像设备200的结构示意图请参阅图11，包括上述任一实施例中的广角镜头(例如广角镜头100)及成像元件210。成像元件210可以是CMOS(Complementary Metal Oxide Semiconductor，互补性金属氧化物半导体)图像传感器，还可以是CCD(Charge Coupled Device，电荷耦合器件)图像传感器。
成像设备200可以是运动相机、全景相机、车载摄像头以及其他任意一种形态的装载了光学成像镜头的电子设备。
本实施例提供的成像设备200包括广角镜头100，由于广角镜头具有小型 化、低敏感度以及良好的热稳定性好等优点，因此，该成像设备200具有小型化、低敏感度以及良好的热稳定性好等优点。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。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和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (12)

  1. 一种广角镜头，沿光轴从物侧到像侧依序包括第一透镜、第二透镜、第三透镜、第四透镜、光阑、第五透镜、第六透镜、第七透镜、以及滤光片，其特征在于，
    所述第一透镜具有负光焦度，其物侧面为凸面，像侧面为凹面；
    所述第二透镜具有负光焦度，其物侧面为凸面，像侧面为凹面；
    所述第三透镜具有负光焦度，其物侧面和像侧面均为凹面；
    所述第四透镜具有正光焦度，其物侧面和像侧面均为凸面；
    所述第五透镜具有正光焦度，其物侧面和像侧面均为凸面；
    所述第六透镜具有负光焦度，其物侧面和像侧面均为凹面，且所述第五透镜与所述第六透镜组成胶合体；
    所述第七透镜具有正光焦度，其物侧面和像侧面均为凸面；
    其中，所述第一透镜和所述第四透镜为玻璃球面镜片，所述第二透镜、所述第三透镜、所述第五透镜、所述第六透镜和所述第七透镜均为塑胶非球面镜片，且各透镜的光学中心均位于同一直线上。
  2. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    1.55<h/f<1.65；
    其中，h表示所述广角镜头的最大半视场角所对应的像高，f表示所述广角镜头的有效焦距。
  3. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    0.04/°<D/h/HFOV<0.06/°；
    其中，HFOV表示所述广角镜头的最大半视场角，D表示所述第一透镜的物侧面的最大通光口径，h表示所述广角镜头的最大半视场角所对应的像高。
  4. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    0.06/°<TTL/h/HFOV<0.07/°；
    其中，TTL表示所述广角镜头的光学总长，HFOV表示所述广角镜头的最大半视场角，h表示所述广角镜头的最大半视场角所对应的像高。
  5. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    15×10 -6/(℃*mm)<[(dN/dT)2+(dN/dT)3]/(f2+f3)<20×10 -6/(℃*mm)；
    -70×10 -6/(℃*mm)<[(dN/dT)5+(dN/dT)6+(dN/dT)7]/(f5+f6+f7)<-50×10 -6/(℃*mm)；
    其中，(dN/dT)2表示所述第二透镜在20℃时的折射率温度系数，(dN/dT)3表示所述第三透镜在20℃时的折射率温度系数，(dN/dT)5表示所述第五透镜在20℃时的折射率温度系数，(dN/dT)6表示所述第六透镜在20℃时的折射率温度系数，(dN/dT)7表示所述第七透镜在20℃时的折射率温度系数，f2表示所述第二透镜的有效焦距，f3表示所述第三透镜的有效焦距，f5表示所述第五透镜的有效焦距，f6表示所述第六透镜的有效焦距，f7表示所述第七透镜的有效焦距。
  6. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    0.4<(T23+T45)/T10<0.45；
    其中，T23表示所述第一透镜和所述第二透镜的轴上空气间隔，T45表示所述第二透镜和所述第三透镜的轴上空气间隔，T10表示所述第一透镜的物侧面与所述光阑面之间的轴上距离。
  7. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    0.2<R31/R72<0.65；
    其中，R31表示所述第三透镜物侧面的曲率半径，R72表示所述第七透镜像侧面的曲率半径。
  8. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    1.9<D5/E5<2.15；
    0.47<D6/E6<0.52；
    其中，D5表示所述第五透镜的中心厚度，E5表示所述第五透镜的边缘厚度，D6表示所述第六透镜的中心厚度，E6表示所述第六透镜的边缘厚度。
  9. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    Figure PCTCN2020131877-appb-100001
    其中，V1表示所述第一透镜的色散系数，V2表示所述第二透镜的色散系数，V3表示所述第三透镜的色散系数，V4表示所述第四透镜的色散系数，
    Figure PCTCN2020131877-appb-100002
    表示所述第一透镜的光焦度，
    Figure PCTCN2020131877-appb-100003
    表示所述第二透镜的光焦度，
    Figure PCTCN2020131877-appb-100004
    表示所述第三透镜的光焦度，
    Figure PCTCN2020131877-appb-100005
    表示所述第四透镜的光焦度。
  10. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    Figure PCTCN2020131877-appb-100006
    其中，V5表示所述第五透镜的色散系数，V6表示所述第六透镜的色散系数，V7表示所述第七透镜的色散系数，
    Figure PCTCN2020131877-appb-100007
    表示所述第五透镜的光焦度，
    Figure PCTCN2020131877-appb-100008
    表示所述第六透镜的光焦度，
    Figure PCTCN2020131877-appb-100009
    表示所述第七透镜的光焦度。
  11. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    0.5<∑CT/TTL<0.6；
    其中，∑CT表示所述第一透镜至所述第七透镜分别于光轴上的厚度总和，TTL表示所述广角镜头的光学总长。
  12. 一种成像设备，其特征在于，包括如权利要求1-11任一项所述的广角镜头和成像元件，所述成像元件用于将所述广角镜头形成的光学图像转换为电信号。
PCT/CN2020/131877 2019-12-18 2020-11-26 广角镜头及成像设备 WO2021121004A1 (zh)

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