WO2018176924A1 - 超广角摄像光学系统及其应用的摄像模组 - Google Patents

超广角摄像光学系统及其应用的摄像模组 Download PDF

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WO2018176924A1
WO2018176924A1 PCT/CN2017/116812 CN2017116812W WO2018176924A1 WO 2018176924 A1 WO2018176924 A1 WO 2018176924A1 CN 2017116812 W CN2017116812 W CN 2017116812W WO 2018176924 A1 WO2018176924 A1 WO 2018176924A1
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lens
optical system
convex surface
focal length
imaging optical
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PCT/CN2017/116812
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English (en)
French (fr)
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松冈和雄
席爱平
汪鸿飞
符致农
徐小龙
李飞武
曾蓉
曾伟
曾香梅
宁博
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广东弘景光电科技股份有限公司
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Priority to JP2019516050A priority Critical patent/JP2019517685A/ja
Publication of WO2018176924A1 publication Critical patent/WO2018176924A1/zh

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised 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
    • 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

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  • the invention relates to a wide-angle imaging optical system and a camera module thereof, and particularly to an optical system suitable for a panoramic VR camera and a 360° dead angle monitoring field and a camera module thereof.
  • an embodiment of the present invention provides an ultra wide-angle imaging optical system.
  • the ultra wide-angle imaging optical system is provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth from the object plane to the image plane along the optical axis.
  • a lens; each lens of the optical system satisfies the following conditions:
  • f is the focal length of the entire optical system
  • f1 is the focal length of the first lens
  • f2 is the focal length of the second lens
  • f3 is the focal length of the third lens
  • f4 is the focal length of the fourth lens
  • f5 is the focal length of the fifth lens
  • F67 is the combined focal length of the sixth lens and the seventh lens
  • f8 is the focal length of the eighth lens.
  • an embodiment of the present invention further provides a camera module.
  • the camera module includes at least an optical lens, and the ultra wide-angle imaging optical system described above is mounted in the optical lens.
  • the embodiment of the invention is suitable for the panoramic VR camera and the 360° dead angle monitoring field, and has a moderate number of lenses and a simple structure; at the same time, it has excellent performance of 240° super wide angle and more than 8 million pixels.
  • FIG. 1 is a schematic structural view of an imaging optical system or a camera module of the present invention
  • FIG. 2 is a field curvature and distortion curve diagram of the imaging optical system or the imaging module of the present invention
  • 3 is a color difference diagram of the imaging optical system or the camera module of the present invention.
  • FIG. 5 is a front view of the imaging optical system or the imaging module of the present invention.
  • the ultra-wide-angle imaging optical system is provided with a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 from the object plane to the image plane 10 along the optical axis.
  • f is the focal length of the entire optical system
  • f1 is the focal length of the first lens 1
  • f2 is the focal length of the second lens 2
  • f3 is the focal length of the third lens 3
  • f4 is the focal length of the fourth lens 4
  • f5 is the fifth
  • f67 is the combined focal length of the sixth lens 6 and the seventh lens 7
  • f8 is the focal length of the eighth lens 8.
  • the embodiment of the invention is suitable for the panoramic VR camera and the 360° dead angle monitoring field, and has a moderate number of lenses and a simple structure; at the same time, it has excellent performance of 240° super wide angle and more than 8 million pixels.
  • the object surface side of the first lens 1 is a convex surface, the image surface side is a concave surface, and the refractive power thereof is negative;
  • the object surface side of the second lens 2 is a convex surface, and the image surface side is a concave surface, and the optical power is negative.
  • the object surface side of the third lens 3 is a convex surface, the image surface side is a concave surface, and the refractive power thereof is negative;
  • the object surface side of the fourth lens 4 is a convex surface, and the image surface side is a convex surface, and the power is positive;
  • the object side of the five lens 5 is a concave surface, the image side is a convex surface, and its refractive power is positive;
  • the object surface side of the sixth lens 6 is a convex surface, the image side is a convex surface, and its optical power is positive;
  • the object side of 7 is a concave surface, the image side is a convex surface, and its refractive power is negative;
  • the object surface side of the eighth lens 8 is a convex surface, and the image surface side is a convex surface, and its refractive power is positive.
  • the structure is simple and ensures good optical performance.
  • the sixth lens 6 and the seventh lens 7 are glued to each other to form a combined lens whose refractive power is positive.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd2 of the second lens 2 and the material Abbe constant Vd2 satisfy: Nd2 ⁇ 1.57 and Vd2 > 62.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd4 and the material Abbe constant Vd4 of the fourth lens 4 satisfy: Nd4>1.92, and Vd4 ⁇ 25.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd6 and the material Abbe constant Vd6 of the sixth lens 6 satisfy: Nd6 ⁇ 1.66, and Vd6 > 57.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd8 and the material Abbe constant Vd8 of the eighth lens 8 satisfy: Nd8 ⁇ 1.60 and Vd8>67.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd1 of the first lens 1 and the material Abbe constant Vd1 satisfy: Nd1>1.75 and Vd1 ⁇ 50.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd3 and the material Abbe constant Vd3 of the third lens 3 satisfy: Nd3 ⁇ 1.57, Vd3>62.
  • the structure is simple and ensures good optical performance.
  • the material refractive index Nd5 and the material Abbe constant Vd5 of the fifth lens 5 satisfy: Nd5 ⁇ 1.70, and Vd5 > 53.
  • the structure is simple and ensures good optical performance.
  • the first lens 1 to the eighth lens 8 are both glass lenses, and the fifth lens 5 and the eighth lens 6 are glass aspherical lenses. Can effectively improve the optical performance of the optical lens.
  • the aperture stop 9 is located between the fifth lens 5 and the sixth lens 6.
  • the structure is simple and used to adjust the intensity of the beam.
  • the focal length f of the present optical system is 1.38 mm
  • the pupil index FNo. is 2.0
  • the field of view angle 2 ⁇ 240°.
  • the basic parameters of this optical system are shown in the following table:
  • the fifth lens 5 and the eighth lens 8 satisfy the following aspherical equation:
  • the parameter c is the curvature corresponding to the radius
  • y is the radial coordinate (the unit of which is the same as the unit of the lens length)
  • k is the coefficient of the conic quadratic curve.
  • the surface curve is a hyperbola, a parabola equal to -1, an ellipse between -1 and 0, and a circle equal to 0.
  • a 1 to a 8 respectively represent coefficients corresponding to the respective radial coordinates, and the shape and size of the aspheric surfaces on both sides of the lens can be accurately set by the above parameters.
  • the aspherical correlation values of the fifth lens 5 and the eighth lens 8 are as follows:
  • the optical system in this embodiment has excellent performance of 240° super wide angle and more than 8 million pixels.
  • a camera module includes at least an optical lens in which the above-described ultra wide-angle imaging optical system is mounted.
  • This camera module is suitable for panoramic VR camera and 360° dead angle monitoring field.
  • the number is moderate, the structure is simple; at the same time, it has excellent performance of 240° super wide angle and more than 8 million pixels.

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

Abstract

一种超广角摄像光学系统,沿光轴从物面到像面(10)依次设有:第一透镜(1)、第二透镜(2)、第三透镜(3)、第四透镜(4)、第五透镜(5)、第六透镜(6)、第七透镜(7)和第八透镜(8);光学系统的各透镜满足如下条件:-0.2<f/f1<-0.09;-0.25<f/f2<-0.15;-0.3<f/f3<-0.19;0.17<f/f4<0.23;0.02<f/f5<0.07;0.11<f/f67<0.18;0.12<f/f8<0.31。以及一种摄像模组。适用于全景VR相机及360°无死角监控领域,透镜枚数适中,结构简单;同时,具有240°超广角、800万以上像素的优良性能。

Description

超广角摄像光学系统及其应用的摄像模组 技术领域
本发明涉及一种广角摄像光学系统及其应用的摄像模组,尤其是一种适用于全景VR相机及360°无死角监控领域的光学系统及其应用的摄像模组。
背景技术
现有应用于全景VR相机及360°无死角监控领域的光学系统或摄像模组普遍存在镜片过多、结构复杂的缺陷。
发明概述
技术问题
为克服现有光学系统或摄像模组存在镜片过多、结构复杂的问题,本发明实施例一方面提供了一种超广角摄像光学系统。
问题的解决方案
技术解决方案
超广角摄像光学系统,沿光轴从物面到像面依次设有:第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜;该光学系统的各透镜满足如下条件:
(1)-0.2<f/f1<-0.09;
(2)-0.25<f/f2<-0.15;
(3)-0.3<f/f3<-0.19;
(4)0.17<f/f4<0.23;
(5)0.02<f/f5<0.07;
(6)0.11<f/f67<0.18;
(7)0.12<f/f8<0.31;
其中,f为整个光学系统的焦距,f1为第一透镜的焦距,f2为第二透镜的焦距,f3为第三透镜的焦距,f4为第四透镜的焦距,f5为第五透镜的焦距,f67为第六透镜和第七透镜的组合焦距,f8为第八透镜的焦距。
另一方面,本发明实施例还提供了一种摄像模组。
摄像模组,至少包括光学镜头,光学镜头内安装有上述所述的超广角摄像光学系统。
发明的有益效果
有益效果
本发明实施例,适用于全景VR相机及360°无死角监控领域,其透镜枚数适中,结构简单;同时,具有240°超广角、800万以上像素的优良性能。
对附图的简要说明
附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明的摄像光学系统或摄像模组的结构示意图;
图2为本发明的摄像光学系统或摄像模组的场曲、畸变曲线图;
图3为本发明的摄像光学系统或摄像模组的色差图;
图4为本发明的摄像光学系统或摄像模组的MTF曲线图;
图5为本发明的摄像光学系统或摄像模组的相对照度图。
实施该发明的最佳实施例
本发明的最佳实施方式
为了使本发明所解决的技术问题、技术方案及有益效果更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
如图1所示,超广角摄像光学系统,沿光轴从物面到像面10依次设有:第一透镜1、第二透镜2、第三透镜3、第四透镜4、第五透镜5、第六透镜6、第七透镜7、以及第八透镜8;该光学系统的各透镜满足如下条件:
(1)-0.2<f/f1<-0.09;
(2)-0.25<f/f2<-0.15;
(3)-0.3<f/f3<-0.19;
(4)0.17<f/f4<0.23;
(5)0.02<f/f5<0.07;
(6)0.11<f/f67<0.18;
(7)0.12<f/f8<0.31;
其中,f为整个光学系统的焦距,f1为第一透镜1的焦距,f2为第二透镜2的焦距,f3为第三透镜3的焦距,f4为第四透镜4的焦距,f5为第五透镜5的焦距,f67为第六透镜6和第七透镜7的组合焦距,f8为第八透镜8的焦距。
本发明实施例,适用于全景VR相机及360°无死角监控领域,其透镜枚数适中,结构简单;同时,具有240°超广角、800万以上像素的优良性能。
进一步地,第一透镜1的物面侧为凸面,像面侧为凹面,其光焦度为负;第二透镜2的物面侧为凸面,像面侧为凹面,其光焦度为负;第三透镜3的物面侧为凸面,像面侧为凹面,其光焦度为负;第四透镜4的物面侧为凸面,像面侧为凸面,其光焦度为正;第五透镜5的物面侧为凹面,像面侧为凸面,其光焦度为正;第六透镜6的物面侧为凸面,像面侧为凸面,其光焦度为正;第七透镜7的物面侧为凹面,像面侧为凸面,其光焦度为负;第八透镜8的物面侧为凸面,像面侧为凸面,其光焦度为正。结构简单,可保证良好的光学性能。
再进一步地,第六透镜6和第七透镜7相互胶合形成组合透镜,该组合透镜的光焦度为正。结构简单,可保证良好的光学性能。
又进一步地,第二透镜2的材料折射率Nd2、材料阿贝常数Vd2满足:Nd2<1.57,Vd2>62。结构简单,可保证良好的光学性能。
更进一步地,第四透镜4的材料折射率Nd4、材料阿贝常数Vd4满足:Nd4>1.92,Vd4<25。结构简单,可保证良好的光学性能。
再进一步地,第六透镜6的材料折射率Nd6、材料阿贝常数Vd6满足:Nd6<1.66,Vd6>57。结构简单,可保证良好的光学性能。
又进一步地,第八透镜8的材料折射率Nd8、材料阿贝常数Vd8满足:Nd8<1.60,Vd8>67。结构简单,可保证良好的光学性能。
进一步地,第一透镜1的材料折射率Nd1、材料阿贝常数Vd1满足:Nd1>1.75,Vd1<50。结构简单,可保证良好的光学性能。
再进一步地,第三透镜3的材料折射率Nd3、材料阿贝常数Vd3满足:Nd3<1.57,Vd3>62。结构简单,可保证良好的光学性能。
又进一步地,第五透镜5的材料折射率Nd5、材料阿贝常数Vd5满足:Nd5<1.70,Vd5>53。结构简单,可保证良好的光学性能。
具体地,第一透镜1至第八透镜8均为玻璃透镜,且第五透镜5和第八透镜6为玻璃非球面透镜。可以有效提高光学镜头的光学性能。
更具体地,孔径光阑9位于第五透镜5与第六透镜6之间。结构简单,用来调节光束的强度。
具体地,在本实施例中,本光学系统的焦距f为1.38mm,光阑指数FNo.为2.0,视场角2ω=240°。本光学系统的各项基本参数如下表所示:
[Table 1]
Figure PCTCN2017116812-appb-000001
上表中,沿光轴从物面到像面,S1、S2对应为第一透镜1的两个表面;S3、S4对应为第二透镜2的两个表面;S5、S6对应为第三透镜3的两个表面;S7、S8对应为第四透镜4的两个表面;S9、S10对应为第五透镜5的两个表面;STO对应为 光学系统孔径光阑9所在的位置;S12、S13对应为第六透镜6的两个表面;S13、S14对应为第七透镜7的两个表面;S15、S16对应为第八透镜8的两个表面;S17、S18对应为位于第八透镜8和像面10之间的滤光片的两个表面。
更具体地,第五透镜5和第八透镜8满足以下非球面方程式:
Figure PCTCN2017116812-appb-000002
Figure PCTCN2017116812-appb-000003
式中,参数c为半径所对应的曲率,y为径向坐标(其单位和透镜长度单位相同),k为圆锥二次曲线系数。当k系数小于-1时,面型曲线为双曲线,等于-1时为抛物线,介于-1到0之间时为椭圆,等于0时为圆形。a1至a8分别表示各径向坐标所对应的系数,通过以上参数可以精确设定透镜前后两面非球面的形状尺寸。
第五透镜5和第八透镜8的非球面相关数值如下表所示:
[Table 2]
Figure PCTCN2017116812-appb-000004
从图2至图5中可以看出,本实施例中的光学系统具有240°超广角、800万以上像素的优良性能。
一种摄像模组,至少包括光学镜头,光学镜头内安装有上述所述的超广角摄像光学系统。本摄像模组,适用于全景VR相机及360°无死角监控领域,其透镜枚 数适中,结构简单;同时,具有240°超广角、800万以上像素的优良性能。
如上所述是结合具体内容提供的一种或多种实施方式,并不认定本发明的具体实施只局限于这些说明。凡与本发明的方法、结构等近似、雷同,或是对于本发明构思前提下做出若干技术推演或替换,都应当视为本发明的保护范围。

Claims (10)

  1. 超广角摄像光学系统,沿光轴从物面到像面依次设有:第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、以及第八透镜;其特征在于,该光学系统的各透镜满足如下条件:
    (1)-0.2<f/f1<-0.09;
    (2)-0.25<f/f2<-0.15;
    (3)-0.3<f/f3<-0.19;
    (4)0.17<f/f4<0.23;
    (5)0.02<f/f5<0.07;
    (6)0.11<f/f67<0.18;
    (7)0.12<f/f8<0.31;
    其中,f为整个光学系统的焦距,f1为第一透镜的焦距,f2为第二透镜的焦距,f3为第三透镜的焦距,f4为第四透镜的焦距,f5为第五透镜的焦距,f67为第六透镜和第七透镜的组合焦距,f8为第八透镜的焦距。
  2. 根据权利要求1所述的超广角摄像光学系统,其特征在于,
    第一透镜的物面侧为凸面,像面侧为凹面,其光焦度为负;
    第二透镜的物面侧为凸面,像面侧为凹面,其光焦度为负;
    第三透镜的物面侧为凸面,像面侧为凹面,其光焦度为负;
    第四透镜的物面侧为凸面,像面侧为凸面,其光焦度为正;
    第五透镜的物面侧为凹面,像面侧为凸面,其光焦度为正;
    第六透镜的物面侧为凸面,像面侧为凸面,其光焦度为正;
    第七透镜的物面侧为凹面,像面侧为凸面,其光焦度为负;
    第八透镜的物面侧为凸面,像面侧为凸面,其光焦度为正。
  3. 根据权利要求1或2所述的超广角摄像光学系统,其特征在于,第六透镜和第七透镜相互胶合形成组合透镜,该组合透镜的光焦度为正。
  4. 根据权利要求3所述的超广角摄像光学系统,其特征在于,第二透镜的材料折射率Nd2、材料阿贝常数Vd2满足:Nd2<1.57,Vd2>62。
  5. 根据权利要求3所述的超广角摄像光学系统,其特征在于,第四透镜的材料折射率Nd4、材料阿贝常数Vd4满足:Nd4>1.92,Vd4<25。
  6. 根据权利要求3所述的超广角摄像光学系统,其特征在于,第六透镜的材料折射率Nd6、材料阿贝常数Vd6满足:Nd6<1.66,Vd6>57。
  7. 根据权利要求3所述的超广角摄像光学系统,其特征在于,第八透镜的材料折射率Nd8、材料阿贝常数Vd8满足:Nd8<1.60,Vd8>67。
  8. 根据权利要求3所述的超广角摄像光学系统,其特征在于,第一透镜至第八透镜均为玻璃透镜。
  9. 根据权利要求3所述的超广角摄像光学系统,其特征在于,第五透镜和第八透镜为玻璃非球面透镜。
  10. 摄像模组,至少包括光学镜头,其特征在于,光学镜头内安装有权利要求1-9任一项所述的超广角摄像光学系统。
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