WO2022205289A1 - 摄像头组件、拍摄装置和可移动平台 - Google Patents

摄像头组件、拍摄装置和可移动平台 Download PDF

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Publication number
WO2022205289A1
WO2022205289A1 PCT/CN2021/084874 CN2021084874W WO2022205289A1 WO 2022205289 A1 WO2022205289 A1 WO 2022205289A1 CN 2021084874 W CN2021084874 W CN 2021084874W WO 2022205289 A1 WO2022205289 A1 WO 2022205289A1
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Prior art keywords
lens
camera assembly
optical
object side
image side
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PCT/CN2021/084874
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English (en)
French (fr)
Inventor
刘新明
张树汉
何引刚
刘静
杨松宇
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深圳市大疆创新科技有限公司
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Application filed by 深圳市大疆创新科技有限公司 filed Critical 深圳市大疆创新科技有限公司
Priority to PCT/CN2021/084874 priority Critical patent/WO2022205289A1/zh
Priority to CN202180087695.XA priority patent/CN116724264A/zh
Publication of WO2022205289A1 publication Critical patent/WO2022205289A1/zh

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/18Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Definitions

  • the present application relates to the field of optical imaging, and in particular, to an ultra-wide-angle high-pixel camera assembly, a photographing device and a movable platform using the camera assembly.
  • the present application provides a camera assembly, which sequentially includes from the object side to the image side:
  • the first lens group includes sequentially from the object side to the image side:
  • the second lens group includes sequentially from the object side to the image side:
  • the fourth lens is combined with the fifth lens to form a cemented lens having positive refractive power
  • a filter is provided between the second lens group and the image plane.
  • the effective focal length of the camera assembly is f
  • the maximum image circle diameter of the imaging surface of the camera assembly is IMH
  • the entrance pupil diameter of the camera assembly is EPD
  • the camera assembly satisfies f /IMH ⁇ 0.6, and f/EPD ⁇ 1.8.
  • the total optical length of the camera assembly is TTL ⁇ 30mm.
  • the maximum image circle diameter of the imaging plane of the camera assembly is 8.64 mm.
  • the optical focal length of the first lens group is f 1 , and -12mm ⁇ f 1 ⁇ -7mm.
  • the optical focal length of the second lens group is f 2 , 7mm ⁇ f 2 ⁇ 9mm and ⁇ 1.3 ⁇ f 1 /f 1 ⁇ 0.9.
  • the object side of the first lens is convex and the image side is concave.
  • the optical refractive index of the first lens is 1.80 ⁇ Nd 1 ⁇ 2; the optical dispersion coefficient of the first lens is 40 ⁇ Vd 1 ⁇ 90.
  • the light-passing diameter of the first lens is D 1
  • the maximum image circle diameter of the imaging surface of the camera assembly is IMH
  • the distance from the object side of the first lens to the imaging plane of the camera assembly on the optical axis is TTL, and IMH/TTL ⁇ 0.28.
  • the second lens has a meniscus shape with a concave object side and a convex image side.
  • the optical refractive index of the second lens is 1.65 ⁇ Nd 2 ⁇ 1.75; the optical dispersion coefficient of the second lens is 45 ⁇ Vd 2 ⁇ 65.
  • the object side of the third lens is convex and the image side is convex.
  • the optical refractive index of the third lens is 1.55 ⁇ Nd 3 ⁇ 1.7; the optical dispersion coefficient of the third lens is 45 ⁇ Vd 3 ⁇ 65.
  • the object side of the fourth lens is convex and the image side is convex.
  • the optical refractive index of the fourth lens is 1.45 ⁇ Nd 4 ⁇ 1.6; and the optical dispersion coefficient of the fourth lens is 65 ⁇ Vd 4 ⁇ 90.
  • the fifth lens has a meniscus shape with a concave object side surface and a convex image side surface.
  • the optical refractive index of the fifth lens is 1.8 ⁇ Nd 5 ⁇ 1.96; the optical dispersion coefficient of the fifth lens is 15 ⁇ Vd 5 ⁇ 30.
  • the optical refractive indices of the fourth lens and the fifth lens satisfy Vd 4 -Vd 5 ⁇ 40.
  • the sixth lens has a meniscus shape with a convex object side surface and a concave image side surface.
  • the optical refractive index of the sixth lens is 1.7 ⁇ Nd 6 ⁇ 1.8; the optical dispersion coefficient of the sixth lens is 45 ⁇ Vd 6 ⁇ 60.
  • the present application also provides a photographing device, comprising:
  • the present application also provides a movable platform, including:
  • the above-mentioned imaging device provided on the main body.
  • the movable platform is a vehicle or an aircraft.
  • the camera assembly, photographing device and movable platform provided by the present application adopt the combination of four lenses and two aspherical lenses, which not only reduces the outer diameter of the entire camera assembly (to achieve miniaturization), but also satisfies the requirements for high pixel requirements (to achieve high accuracy/resolution).
  • the camera assembly can effectively identify long-distance and small obstacle targets, and provide more accurate road condition information for autonomous driving.
  • FIG. 1 is a schematic diagram of an optical structure of a camera assembly provided in Embodiment 1 of the present application;
  • FIG. 2 is a schematic diagram of an optical aberration of the camera assembly according to Embodiment 1 of the present application;
  • FIG. 3 is a schematic diagram of field curvature and distortion of the camera assembly according to Embodiment 1 of the present application;
  • FIG. 4 is a schematic diagram of the MTF curve of the camera assembly according to the first embodiment of the present application.
  • FIG. 5 is a schematic diagram of the optical structure of the camera assembly provided in Embodiment 2 of the present application.
  • FIG. 6 is a schematic diagram of an optical aberration of the camera assembly according to the second embodiment of the present application.
  • FIG. 7 is a schematic diagram of field curvature and distortion of the camera assembly according to the second embodiment of the present application.
  • FIG. 8 is a schematic diagram of the MTF curve of the camera assembly according to the second embodiment of the present application.
  • FIG. 9 is a schematic diagram of the optical structure of the camera assembly according to the third embodiment of the application.
  • FIG. 10 is a schematic diagram of the optical aberration of the camera assembly according to the third embodiment of the application;
  • FIG. 11 is a schematic diagram of field curvature and distortion of the camera assembly according to Embodiment 3 of the present application.
  • FIG. 12 is a schematic diagram of the MTF curve of the camera assembly according to the third embodiment of the present application.
  • the present application provides a camera assembly, which sequentially includes a first lens group 1 with negative refractive power and a second lens group 2 with positive refractive power from the object side to the image side.
  • An aperture is provided between the first lens group 1 and the second lens group 2 described above.
  • the first lens group 1 sequentially includes an aspherical first lens 11 with negative refractive power and a second lens 12 with negative refractive power from the object side to the image side.
  • the second lens group 2 includes, in order from the object side to the image side, a third lens 21 having positive refractive power, a fourth lens 22 having positive refractive power, a fifth lens 23 having negative refractive power, and a non-contact lens having positive refractive power
  • the spherical sixth lens 24 .
  • the fourth lens 22 and the fifth lens 23 are combined into a cemented lens with positive refractive power.
  • the second lens, the third lens, the fourth lens and the fifth lens may be spherical lenses.
  • the camera assembly provided by the present application adopts a combination of four spherical lenses and two aspherical lenses, which not only reduces the outer diameter of the entire camera assembly (to achieve miniaturization), but also meets the requirements for high pixels (to achieve high precision/resolution).
  • the camera assembly can effectively identify long-distance and small obstacle targets, and provide more accurate road condition information for autonomous driving.
  • the first lens 11 to the sixth lens 23 can be made of glass.
  • a filter IR is provided between the second lens group 2 and the image plane.
  • the filter IR can filter out the cluttered bands other than visible light, thereby improving the optical quality of the camera components, achieving the best imaging effect, and better meeting the requirements of high pixels.
  • the effective focal length of the camera assembly is f
  • the maximum image circle diameter of the imaging plane is IMH
  • the entrance pupil diameter is EPD
  • the camera assembly satisfies f/IMH ⁇ 0.6, and f/EPD ⁇ 1.8.
  • the total optical length of the camera assembly is TTL ⁇ 30mm.
  • the maximum image circle diameter of the imaging surface of the camera assembly is 8.64 mm.
  • the optical focal length of the first lens group is f 1 , and ⁇ 12mm ⁇ f 1 ⁇ 7mm.
  • the optical focal length of the second lens group is f 2 , 7mm ⁇ f 2 ⁇ 9mm, and ⁇ 1.3 ⁇ f 1 /f 1 ⁇ 0.9.
  • the first lens 11 is a meniscus negative aspheric glass lens with a convex object side and a concave image side, and there is no inflection point on the object side and the image side.
  • Such an arrangement can effectively collect incident light rays with a large angle and increase the field of view of the camera assembly.
  • the optical refractive index of the first lens 11 is 1.80 ⁇ Nd 1 ⁇ 2, and the optical dispersion coefficient is 40 ⁇ Vd 1 ⁇ 90.
  • Nd 1 represents the d-light refractive index of the lens material
  • Vd 1 represents the d-light dispersion coefficient of the lens material.
  • Nd 1 is 1.80 and Vd 1 is 40, which can effectively reduce the outer diameter of the camera assembly and reduce the dispersion of the camera assembly.
  • the light passing diameter of the first lens 11 is D 1
  • the maximum image circle diameter of the imaging surface of the camera assembly is IMH
  • the distance from the object side of the first lens 11 to the imaging plane of the camera assembly on the optical axis is TTL, and IMH/TTL ⁇ 0.28.
  • Controlling the ratio of D 1 /IMH and the ratio of IMH/TTL to satisfy the above conditions is conducive to reducing the outer diameter of the camera assembly, thereby reducing the installation space required for the camera assembly, and facilitating miniaturization.
  • the second lens 12 is a meniscus-shaped negative refractive power glass lens with a concave object side and a convex image side (the shape is just opposite to that of the first lens 11 ), and the light refractive index of the second lens 12 is 1.65 ⁇ Nd 2 ⁇ 1.75, the light dispersion coefficient is 45 ⁇ Vd 2 ⁇ 65.
  • Nd 2 represents the d-light refractive index of the lens material
  • Vd 2 represents the d-light dispersion coefficient of the lens material.
  • the second lens 12 can further collect the large-angle light refracted by the first lens 11 , and the light path becomes smooth after the large-angle light exits through the second lens 12 , which can reduce the aberration of the entire camera assembly and improve the pixels.
  • the third lens 21 is a glass lens with positive refractive power whose object side and image side are convex.
  • the refractive index of the third lens 21 is 1.55 ⁇ Nd 3 ⁇ 1.7, and the light dispersion coefficient is 45 ⁇ Vd 3 ⁇ 65.
  • Nd 3 represents the d-light refractive index of the lens material, and Vd 3 represents the d-light dispersion coefficient of the lens material.
  • the third lens 21 can accelerate the convergence of the light in the entire field of view, and selecting an appropriate material can effectively reduce the temperature drift of the back focus of the entire camera assembly.
  • the fourth lens 22 is a positive refractive power glass lens with convex surfaces on both the object side and the image side.
  • the refractive index of the fourth lens 22 is 1.45 ⁇ Nd 4 ⁇ 1.6, and the light dispersion coefficient 65 ⁇ Vd 4 ⁇ 90.
  • Nd 4 represents the d-light refractive index of the lens material
  • Vd 4 represents the d-light dispersion coefficient of the lens material.
  • the fifth lens 23 has a meniscus shape with a concave object side surface and a convex image side surface.
  • the optical refractive index of the fifth lens 23 is 1.8 ⁇ Nd 5 ⁇ 1.96, and the optical dispersion coefficient is 15 ⁇ Vd 5 ⁇ 30.
  • Nd 5 represents the d-light refractive index of the lens material
  • Vd 5 represents the d-light dispersion coefficient of the lens material.
  • the fourth lens 22 and the fifth lens 23 are combined into a cemented lens (ie, the image side of the fourth lens 22 is attached to the object side of the fifth lens 23 ), and satisfies Vd 4 -Vd 5 ⁇ 40.
  • Using a cemented lens can further reduce the dispersion of the entire camera assembly, effectively improve the image quality, and achieve high pixels.
  • the sixth lens 24 is a meniscus negative aspheric glass lens with a convex object side surface and a concave image side surface, and there is no inflection point on the object side surface and the image side surface.
  • the optical refractive index of the sixth lens 24 is 1.7 ⁇ Nd 6 ⁇ 1.8, and the optical dispersion coefficient 45 ⁇ Vd 6 ⁇ 60.
  • Nd 6 represents the d-light refractive index of the lens material
  • Vd 6 represents the d-light dispersion coefficient of the lens material.
  • the sixth lens 24 effectively reduces the astigmatism of the entire camera assembly, so that the light is more smoothly converged to the image plane, which greatly improves the resolution capability of the entire camera assembly, so that it has the advantages of ultra-wide angle and high pixels.
  • the present application also provides a photographing device, comprising a casing and any of the above-mentioned camera assemblies disposed on (inside) the casing.
  • the present application also provides a movable platform, comprising a main body and the above-mentioned photographing device disposed on (inside) the main body.
  • the movable platform is a vehicle or an aircraft.
  • FIG. 1 shows a schematic diagram of the optical structure of the camera assembly provided in this embodiment, wherein the specific optical parameters of the camera assembly are shown in Table 1:
  • the surface shapes of the aspherical first lens and sixth lens satisfy the following equations:
  • z is the distance between the surface and the vertex of the surface in the direction of the optical axis
  • h is the distance from the optical axis to the surface
  • c is the curvature of the vertex of the surface
  • K is the quadratic surface coefficient
  • B, C, D, E, F are four order, sixth order, eighth order, tenth order, twelfth order surface coefficients.
  • the aspheric parameters of the aspheric first lens and sixth lens are shown in Table 2:
  • FIG. 2 shows a schematic diagram of optical aberrations of the camera assembly of this embodiment
  • FIG. 3 shows a schematic diagram of field curvature and distortion of the camera assembly of the embodiment
  • FIG. 4 shows a schematic diagram of the MTF curve of the camera assembly of this embodiment.
  • the camera assembly provided in this embodiment has very good optical quality, and uses different lens combinations and reasonable optical power distribution to achieve ultra-wide-angle, high-pixel and other optical performance.
  • FIG. 5 shows a schematic diagram of the optical structure of the camera assembly provided in this embodiment, wherein the specific optical parameters of the camera assembly are shown in Table 4:
  • the surface shapes of the aspherical first lens and sixth lens satisfy the following equations:
  • z is the distance between the surface and the vertex of the surface in the direction of the optical axis
  • h is the distance from the optical axis to the surface
  • c is the curvature of the vertex of the surface
  • K is the quadratic surface coefficient
  • B, C, D, E, F are four order, sixth order, eighth order, tenth order, twelfth order surface coefficients.
  • the aspheric parameters of the aspheric first lens and sixth lens are shown in Table 5:
  • FIG. 6 shows a schematic diagram of optical aberrations of the camera assembly of this embodiment
  • FIG. 7 shows a schematic diagram of field curvature and distortion of the camera assembly of this embodiment
  • FIG. 8 shows a schematic diagram of MTF curve of the camera assembly of this embodiment.
  • the camera assembly provided in this embodiment has very good optical quality, and uses different lens combinations and reasonable optical power distribution to achieve ultra-wide-angle, high-pixel and other optical performance.
  • FIG. 9 shows a schematic diagram of the optical structure of the camera assembly provided in this embodiment, wherein the specific optical parameters of the camera assembly are shown in Table 7:
  • the surface shapes of the aspherical first lens and sixth lens satisfy the following equations:
  • z is the distance between the surface and the vertex of the surface in the direction of the optical axis
  • h is the distance from the optical axis to the surface
  • c is the curvature of the vertex of the surface
  • K is the quadratic surface coefficient
  • B, C, D, E, F are four order, sixth order, eighth order, tenth order, twelfth order surface coefficients.
  • the aspheric parameters of the aspheric first lens and sixth lens are shown in Table 8:
  • FIG. 10 shows a schematic diagram of optical aberrations of the camera assembly of this embodiment
  • FIG. 11 shows a schematic diagram of field curvature and distortion of the camera assembly of this embodiment
  • FIG. 12 shows a schematic diagram of the MTF curve of the camera assembly of this embodiment.
  • the camera assembly provided in this embodiment has very good optical quality, and uses different lens combinations and reasonable optical power distribution to achieve ultra-wide-angle, high-pixel and other optical performance.

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Abstract

本申请提供一种摄像头组件,由物侧至像侧依次包括:具有负光焦度的第一透镜组和具有正光焦度的第二透镜组,所述的第一透镜组和第二透镜组之间设有光圈;所述的第一透镜组沿物侧至像侧依次包括:具有负光焦度的非球面的第一透镜;以及具有负光焦度的第二透镜;所述第二透镜组沿物侧至像侧依次包括:具有正光焦度的第三透镜;具有正光焦度的第四透镜;具有负光焦度的第五透镜,所述第四透镜与所述第五透镜组合成具有正光焦度的胶合透镜;以及具有正光焦度的非球面的第六透镜。此外,本申请还提供了拍摄装置和可移动平台。本申请提供的摄像头组件不仅减小了整个摄像头组件的外径(实现小型化),并且满足了对高像素的要求(实现高精度/分辨率)。

Description

摄像头组件、拍摄装置和可移动平台 技术领域
本申请涉及光学成像领域,特别涉及一种超广角高像素摄像头组件,以及采用该摄像头组件的拍摄装置和可移动平台。
背景技术
近年来,随着科技的不断发展,汽车、无人机开始向自动驾驶方向发展。以汽车为例,如果要实现辅助驾驶、自动驾驶,那么采用基于高像素的车载成像镜头的目标识别和障碍物识别系统就必不可少。自动驾驶通过车载高像素成像镜头等获取外界信息,经过图像算法处理后感知汽车周围环境,从而能够安全的自动驾驶。
目前,市面上的车载成像镜头大多数都是具有较大视场的广角镜头或超广角镜头,这类镜头像素较低,其能够对车身周边附近的物体可以有精准的识别,但对远距离和小障碍物目标的识别精确度较差,无法及时对远距离和小障碍物目标提出预警,不能保障自动驾驶在高速行驶下的行车安全。
发明内容
鉴于背景技术中存在的缺陷,本申请提供一种摄像头组件,由物侧至像侧依次包括:
具有负光焦度的第一透镜组和具有正光焦度的第二透镜组,所述的第一透镜组和第二透镜组之间设有光圈;
其中,所述的第一透镜组沿物侧至像侧依次包括:
具有负光焦度的非球面的第一透镜;以及
具有负光焦度的第二透镜;
其中,所述第二透镜组沿物侧至像侧依次包括:
具有正光焦度的第三透镜;
具有正光焦度的第四透镜;
具有负光焦度的第五透镜,所述第四透镜与所述第五透镜组合成具有正 光焦度的胶合透镜;以及
具有正光焦度的非球面的第六透镜。
在本申请的一些实施方式中,所述的第二透镜组和像面之间设有滤光片。
在本申请的一些实施方式中,所述摄像头组件的有效焦距为f,所述摄像头组件的成像面最大像圆直径为IMH,所述摄像头组件的入瞳直径为EPD,所述摄像头组件满足f/IMH≥0.6,且f/EPD≤1.8。
在本申请的一些实施方式中,所述摄像头组件的光学总长TTL≤30mm。
在本申请的一些实施方式中,所述摄像头组件的成像面最大像圆直径为8.64mm。
在本申请的一些实施方式中,所述第一透镜组的光学焦距为f 1,且-12mm≤f 1≤-7mm。
在本申请的一些实施方式中,所述第二透镜组的光学焦距为f 2,7mm≤f 2≤9mm且-1.3≤f 1/f 1≤-0.9。
在本申请的一些实施方式中,所述第一透镜的物侧面为凸面且像侧面为凹面。
在本申请的一些实施方式中,所述第一透镜的光折射率1.80≤Nd 1≤2;所述第一透镜的光色散系数40≤Vd 1≤90。
在本申请的一些实施方式中,所述第一透镜的通光直径为D 1,所述摄像头组件的成像面最大像圆直径为IMH,D 1/IMH≤1.2。
在本申请的一些实施方式中,所述第一透镜的物侧面至所述摄像头组件的成像面于光轴上的距离为TTL,且IMH/TTL≥0.28。
在本申请的一些实施方式中,所述第二透镜呈物侧面为凹面且像侧面为凸面的弯月形。
在本申请的一些实施方式中,所述第二透镜的光折射率1.65≤Nd 2≤1.75;所述第二透镜的光色散系数45≤Vd 2≤65。
在本申请的一些实施方式中,所述第三透镜的物侧面为凸面且像侧面为凸面。
在本申请的一些实施方式中,所述第三透镜的光折射率1.55≤Nd 3≤1.7;所述第三透镜的光色散系数45≤Vd 3≤65。
在本申请的一些实施方式中,所述第四透镜的物侧面为凸面且像侧面为凸面。
在本申请的一些实施方式中,所述第四透镜的光折射率1.45≤Nd 4≤1.6; 所述第四透镜的光色散系数65≤Vd 4≤90。
在本申请的一些实施方式中,所述第五透镜呈物侧面为凹面且像侧面为凸面的弯月形。
在本申请的一些实施方式中,所述第五透镜的光折射率1.8≤Nd 5≤1.96;所述第五透镜的光色散系数15≤Vd 5≤30。
在本申请的一些实施方式中,所述第四透镜和所述第五透镜的光折射率满足Vd 4-Vd 5≥40。
在本申请的一些实施方式中,所述第六透镜呈物侧面为凸面且像侧面为凹面的弯月形。
在本申请的一些实施方式中,所述第六透镜的光折射率1.7≤Nd 6≤1.8;所述第六透镜的光色散系数45≤Vd 6≤60。
此外,本申请还提供了一种拍摄装置,包括:
壳体;
设置于所述壳体的如上所述的任一种摄像头组件。
另外,本申请还提供了一种可移动平台,包括:
本体;
设置于所述本体的如上所述的拍摄装置。
在本申请的一些实施方式中,所述可移动平台为车辆或飞行器。
本申请提供的摄像头组件、拍摄装置和可移动平台采用四个透镜和两个非球面透镜相结合的方式,不仅减小了整个摄像头组件的外径(实现小型化),并且满足了对高像素的要求(实现高精度/分辨率)。通过四个透镜和两个非球面透镜光焦度的合理搭配,使得该摄像头组件能有效识别远距离和小障碍物目标,为自动驾驶提供更精确的路况信息。
附图说明
图1为本申请实施例一提供的摄像头组件的光学结构示意图;
图2为本申请实施例一的摄像头组件的光学像差示意图;
图3为本申请实施例一的摄像头组件的场曲及畸变示意图;
图4为本申请实施例一的摄像头组件的MTF曲线示意图;
图5为本申请实施例二提供的摄像头组件的光学结构示意图;
图6为本申请实施例二的摄像头组件的光学像差示意图;
图7为本申请实施例二的摄像头组件的场曲及畸变示意图;
图8为本申请实施例二的摄像头组件的MTF曲线示意图;
图9为本申请实施例三提供的摄像头组件的光学结构示意图;图10为本申请实施例三的摄像头组件的光学像差示意图;
图11为本申请实施例三的摄像头组件的场曲及畸变示意图;
图12为本申请实施例三的摄像头组件的MTF曲线示意图。
具体实施方式
为了使发明的目的、技术方案和优点更加清楚,下面结合附图和具体实施例对发明作进一步详细的说明。虽然附图中显示了本公开示例性实施例,然而应当理解,可以以各种形式实现本申请而不应被这里阐述的实施例所限制。相反,提供这些实施例是为了能够更便于透彻的理解本申请,并且能够将本申请的构思完整的传达给本领域人员。
如图1、5、9所示,本申请提供一种摄像头组件,由物侧至像侧依次包括具有负光焦度的第一透镜组1和具有正光焦度的第二透镜组2,所述的第一透镜组1和第二透镜组2之间设有光圈。其中,第一透镜组1沿物侧至像侧依次包括具有负光焦度的非球面的第一透镜11和具有负光焦度的第二透镜12。第二透镜组2沿物侧至像侧依次包括具有正光焦度的第三透镜21、具有正光焦度的第四透镜22、具有负光焦度的第五透镜23以及具有正光焦度的非球面的第六透镜24。所述第四透镜22与所述第五透镜23组合成具有正光焦度的胶合透镜。
示例性的,第二透镜、第三透镜、第四透镜和第五透镜可以为球面透镜。
基于上述结构,本申请提供的摄像头组件采用四个球面透镜和两个非球面透镜相结合的方式,不仅减小了整个摄像头组件的外径(实现小型化),并且满足了对高像素的要求(实现高精度/分辨率)。通过四个透镜和两个非球面透镜光焦度的合理搭配,使得该摄像头组件能有效识别远距离和小障碍物目标,为自动驾驶提供更精确的路况信息。考虑到摄像头组件的使用环境,特别是车载时对温度、可靠性要求较高,第一透镜11至第六透镜23可以采用玻璃材质。
进一步地,第二透镜组2和像面之间设有滤光片IR。滤光片IR可以过 滤掉可见光以外的杂波段,进而提升摄像头组件的光学品质,实现最佳的成像效果,更好地满足高像素的要求。
进一步地,所述摄像头组件的有效焦距为f,成像面最大像圆直径为IMH,入瞳直径为EPD,所述摄像头组件满足f/IMH≥0.6,且f/EPD≤1.8。所述摄像头组件的光学总长TTL≤30mm。例如,所述摄像头组件的成像面最大像圆直径为8.64mm。
进一步地,第一透镜组的光学焦距为f 1,且-12mm≤f 1≤-7mm。第二透镜组的光学焦距为f 2,7mm≤f 2≤9mm且-1.3≤f 1/f 1≤-0.9。
在本申请中,第一透镜11呈物侧面为凸面且像侧面为凹面的弯月形负光焦度非球面玻璃透镜,其物侧面和像侧面均不存在反曲点。这样设置可以有效的收集大角度的入射光线,增大摄像头组件的视场角。
第一透镜11的光折射率1.80≤Nd 1≤2,光色散系数40≤Vd 1≤90。其中Nd 1表示透镜材质的d光折射率,Vd 1表示透镜材质的d光色散系数。例如Nd 1为1.80,Vd 1为40,可以有效的减小摄像头组件的外径,并减少摄像头组件的色散。
进一步地,第一透镜11的通光直径为D 1,所述摄像头组件的成像面最大像圆直径为IMH,D 1/IMH≤1.2。
进一步地,第一透镜11的物侧面至摄像头组件的成像面于光轴上的距离为TTL,且IMH/TTL≥0.28。
控制D 1/IMH的比值和IMH/TTL的比值满足上述条件,有利于减小摄像头组件的外径,进而减少摄像头组件所需的安装空间,有利于实现小型化。
在本申请中,第二透镜12呈物侧面为凹面且像侧面为凸面的弯月形负光焦度玻璃透镜(形状朝向与第一透镜11刚好相反),第二透镜12的光折射率1.65≤Nd 2≤1.75,所光色散系数45≤Vd 2≤65。Nd 2表示透镜材质的d光折射率,Vd 2表示透镜材质的d光色散系数。第二透镜12可以进一步收集第一透镜11折射过来的大角度光线,大角度光线经过第二透镜12出射后光路变得平缓,可以减小整个摄像头组件的像差、提高像素。
在本申请中,第三透镜21呈物侧面和像侧面都是凸面的正光焦度玻璃透镜,第三透镜21的光折射率1.55≤Nd 3≤1.7,光色散系数45≤Vd 3≤65。Nd 3表示透镜材质的d光折射率,Vd 3表示透镜材质的d光色散系数。第三透镜21可以使全视场的光线得到加快会聚,选择合适的材料可以有效的减少整个摄像头组件的后焦温度漂移。
在本申请中,第四透镜22呈物侧面和像侧面都是凸面的正光焦度玻璃透镜,第四透镜22的光折射率1.45≤Nd 4≤1.6,光色散系数65≤Vd 4≤90。Nd 4表示透镜材质的d光折射率,Vd 4表示透镜材质的d光色散系数。
在本申请中,第五透镜23呈物侧面为凹面且像侧面为凸面的弯月形。第五透镜23的光折射率1.8≤Nd 5≤1.96,光色散系数15≤Vd 5≤30。Nd 5表示透镜材质的d光折射率,Vd 5表示透镜材质的d光色散系数。第四透镜22和第五透镜23组合成胶合透镜(即第四透镜22的像侧面贴合第五透镜23的物侧面),并且满足Vd 4-Vd 5≥40。采用胶合透镜可以进一步减小整个摄像头组件的色散,有效提高成像质量,实现高像素。
在本申请中,第六透镜24呈物侧面为凸面且像侧面为凹面的弯月形负光焦度非球面玻璃透镜,其物侧面和像侧面均不存在反曲点。第六透镜24的光折射率1.7≤Nd 6≤1.8,光色散系数45≤Vd 6≤60。Nd 6表示透镜材质的d光折射率,Vd 6表示透镜材质的d光色散系数。第六透镜24有效地减小了整个摄像头组件的像散,使光线比较平顺的会聚到像面,大大提升了整个摄像头组件的分辨能力,使得其具有超广角和高像素的优点。
本申请还提供了一种拍摄装置,包括壳体和设置于壳体上(内)的上述的任意一种摄像头组件。
本申请还提供了一种可移动平台,包括本体和设置于本体上(内)的上述的拍摄装置。
所述的可移动平台为车辆或飞行器。
实施例一
图1显示了本实施例提供的摄像头组件的光学结构示意图,其中摄像头组件的具体光学参数见表1:
表1
Figure PCTCN2021084874-appb-000001
Figure PCTCN2021084874-appb-000002
本实施例中,非球面的第一透镜、第六透镜的表面形状满足下列方程:
Figure PCTCN2021084874-appb-000003
其中,z为曲面与曲面顶点在光轴方向的距离,h为光轴到曲面的距离,c为曲面顶点的曲率,K为二次曲面系数,B、C、D、E、F分别为四阶、六阶、八阶、十阶、十二阶曲面系数。
本实施例中,非球面的第一透镜、第六透镜的非球面参数见表2:
表2
Figure PCTCN2021084874-appb-000004
Figure PCTCN2021084874-appb-000005
本实施例中,摄像头组件的相关光学设计参数见表3:
表3
f(mm) TTL(mm) 光圈数 视场角(度) f 1(mm) f 2(mm) IMH(mm) D 1(mm)
5.26 29.97 1.80 120.00 -8.54 8.69 8.64 10.49
图2显示本实施例的摄像头组件的光学像差示意图,图3显示了实施例的摄像头组件的场曲及畸变示意图,图4显示了本实施例的摄像头组件的MTF曲线示意图。
由此可见,本实施例提供的摄像头组件具体非常好的光学品质,其采用不同的透镜组合以及合理的光焦度分配实现了超广角、高像素等光学性能。
实施例二
图5显示了本实施例提供的摄像头组件的光学结构示意图,其中,摄像头组件的具体光学参数见表4:
表4
Figure PCTCN2021084874-appb-000006
Figure PCTCN2021084874-appb-000007
本实施例中,非球面的第一透镜、第六透镜的表面形状满足下列方程:
Figure PCTCN2021084874-appb-000008
其中,z为曲面与曲面顶点在光轴方向的距离,h为光轴到曲面的距离,c为曲面顶点的曲率,K为二次曲面系数,B、C、D、E、F分别为四阶、六阶、八阶、十阶、十二阶曲面系数。
本实施例中,非球面的第一透镜、第六透镜的非球面参数见表5:
表5
Figure PCTCN2021084874-appb-000009
本实施例中,摄像头组件的相关光学设计参数见表6:
表6
f(mm) TTL(mm) 光圈数 视场角(度) f 1(mm) f 2(mm) IMH(mm) D 1(mm)
5.20 28.83 1.80 120.00 -11.70 9.00 8.64 10.55
图6显示本实施例的摄像头组件的光学像差示意图,图7显示了实施例的摄像头组件的场曲及畸变示意图,图8显示了本实施例的摄像头组件的MTF曲线示意图。
由此可见,本实施例提供的摄像头组件具体非常好的光学品质,其采用不同的透镜组合以及合理的光焦度分配实现了超广角、高像素等光学性能。
实施例三
图9显示了本实施例提供的摄像头组件的光学结构示意图,其中,摄像头组件的具体光学参数见表7:
表7
Figure PCTCN2021084874-appb-000010
Figure PCTCN2021084874-appb-000011
本实施例中,非球面的第一透镜、第六透镜的表面形状满足下列方程:
Figure PCTCN2021084874-appb-000012
其中,z为曲面与曲面顶点在光轴方向的距离,h为光轴到曲面的距离,c为曲面顶点的曲率,K为二次曲面系数,B、C、D、E、F分别为四阶、六阶、八阶、十阶、十二阶曲面系数。
本实施例中,非球面的第一透镜、第六透镜的非球面参数见表8:
表8
Figure PCTCN2021084874-appb-000013
本实施例中,摄像头组件的相关光学设计参数见表9:
表9
f(mm) TTL(mm) 光圈数 视场角(度) f 1(mm) f 2(mm) IMH(mm) D 1(mm)
5.21 29.73 1.80 120.00 -7.00 7.78 8.64 10.03
图10显示本实施例的摄像头组件的光学像差示意图,图11显示了实施例的摄像头组件的场曲及畸变示意图,图12显示了本实施例的摄像头组件的MTF曲线示意图。
由此可见,本实施例提供的摄像头组件具体非常好的光学品质,其采用不同的透镜组合以及合理的光焦度分配实现了超广角、高像素等光学性能。
在本说明书的描述中,参考术语“某些实施方式”、“一个实施方式”、“一些实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
在本申请中,术语“第一”、“第二”、“第三”仅用于描述的目的,而不能理解为指示或暗示相对重要性;术语“多个”则指两个或两个以上,除非另有明确的限定。术语“安装”、“相连”、“连接”、“固定”等术语均应做广义理解,例如,“连接”可以是固定连接,也可以是可拆卸连接,或一体地连接;“相连”可以是直接相连,也可以通过中间媒介间接相连。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本申请中的具体含义。
最后应说明的是,以上实施例仅用以说明本申请的技术方案而非限制性的。尽管参照实施例对本申请进行了详细说明,但本领域的普通技术人员应当理解,对本申请的技术方案进行修改或者等同替换,都不脱离本申请技术方案的精神和范围,其均应涵盖在本申请的权利要求范围当中。

Claims (25)

  1. 一种摄像头组件,其特征在于,由物侧至像侧依次包括:
    具有负光焦度的第一透镜组和具有正光焦度的第二透镜组,所述的第一透镜组和第二透镜组之间设有光圈;
    其中,所述的第一透镜组沿物侧至像侧依次包括:
    具有负光焦度的非球面的第一透镜;以及
    具有负光焦度的第二透镜;
    其中,所述第二透镜组沿物侧至像侧依次包括:
    具有正光焦度的第三透镜;
    具有正光焦度的第四透镜;
    具有负光焦度的第五透镜,所述第四透镜与所述第五透镜组合成具有正光焦度的胶合透镜;以及
    具有正光焦度的非球面的第六透镜。
  2. 根据权利要求1所述的摄像头组件,其特征在于:
    所述的第二透镜组和像面之间设有滤光片。
  3. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述摄像头组件的有效焦距为f,所述摄像头组件的成像面最大像圆直径为IMH,所述摄像头组件的入瞳直径为EPD,所述摄像头组件满足f/IMH≥0.6,且f/EPD≤1.8。
  4. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述摄像头组件的光学总长TTL≤30mm。
  5. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述摄像头组件的成像面最大像圆直径为8.64mm。
  6. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第一透镜组的光学焦距为f 1,且-12mm≤f 1≤-7mm。
  7. 根据权利要求6所述的摄像头组件,其特征在于:
    所述第二透镜组的光学焦距为f 2,7mm≤f 2≤9mm且-1.3≤f 1/f 1≤-0.9。
  8. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第一透镜的物侧面为凸面且像侧面为凹面。
  9. 根据权利要求8所述的摄像头组件,其特征在于:
    所述第一透镜的光折射率1.80≤Nd 1≤2;
    所述第一透镜的光色散系数40≤Vd 1≤90。
  10. 根据权利要求1所述的摄像头组件,其特征在于:
    所述第一透镜的通光直径为D 1,所述摄像头组件的成像面最大像圆直径为IMH,D 1/IMH≤1.2。
  11. 根据权利要求10所述的摄像头组件,其特征在于:
    所述第一透镜的物侧面至所述摄像头组件的成像面于光轴上的距离为TTL,且IMH/TTL≥0.28。
  12. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第二透镜呈物侧面为凹面且像侧面为凸面的弯月形。
  13. 根据权利要求12所述的摄像头组件,其特征在于:
    所述第二透镜的光折射率1.65≤Nd 2≤1.75;
    所述第二透镜的光色散系数45≤Vd 2≤65。
  14. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第三透镜的物侧面为凸面且像侧面为凸面。
  15. 根据权利要求14所述的摄像头组件,其特征在于:
    所述第三透镜的光折射率1.55≤Nd 3≤1.7;
    所述第三透镜的光色散系数45≤Vd 3≤65。
  16. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第四透镜的物侧面为凸面且像侧面为凸面。
  17. 根据权利要求16所述的摄像头组件,其特征在于:
    所述第四透镜的光折射率1.45≤Nd 4≤1.6;
    所述第四透镜的光色散系数65≤Vd 4≤90。
  18. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第五透镜呈物侧面为凹面且像侧面为凸面的弯月形。
  19. 根据权利要求18所述的摄像头组件,其特征在于:
    所述第五透镜的光折射率1.8≤Nd 5≤1.96;
    所述第五透镜的光色散系数15≤Vd 5≤30。
  20. 根据权利要求19所述的摄像头组件,其特征在于:
    所述第四透镜和所述第五透镜的光折射率满足Vd 4-Vd 5≥40。
  21. 根据权利要求1或2所述的摄像头组件,其特征在于:
    所述第六透镜呈物侧面为凸面且像侧面为凹面的弯月形。
  22. 根据权利要求21所述的摄像头组件,其特征在于:
    所述第六透镜的光折射率1.7≤Nd 6≤1.8;
    所述第六透镜的光色散系数45≤Vd 6≤60。
  23. 一种拍摄装置,其特征在于,包括:
    壳体;
    设置于所述壳体的如权利要求1~22中任一项所述的摄像头组件。
  24. 一种可移动平台,其特征在于,包括:
    本体;
    设置于所述本体的如权利要求23所述的拍摄装置。
  25. 根据权利要求24所述的可移动平台,其特征在于:
    所述可移动平台为车辆或飞行器。
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