WO2019000860A1 - 高像素超广角光学系统及其应用的摄像模组 - Google Patents

高像素超广角光学系统及其应用的摄像模组 Download PDF

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WO2019000860A1
WO2019000860A1 PCT/CN2017/116810 CN2017116810W WO2019000860A1 WO 2019000860 A1 WO2019000860 A1 WO 2019000860A1 CN 2017116810 W CN2017116810 W CN 2017116810W WO 2019000860 A1 WO2019000860 A1 WO 2019000860A1
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lens
optical system
focal length
wide
angle optical
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PCT/CN2017/116810
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English (en)
French (fr)
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刘洪海
汪鸿飞
陈波
刘佳俊
刘振庭
席爱平
尹小玲
符致农
赖宗桥
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广东弘景光电科技股份有限公司
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Publication of WO2019000860A1 publication Critical patent/WO2019000860A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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

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  • the present invention relates to an optical system and a lens for the same, and more particularly to a high-pixel super wide-angle optical system and a camera module thereof.
  • an embodiment of the present invention provides a high-pixel super wide-angle optical system.
  • a high-pixel ultra-wide-angle optical system which is provided with a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the object plane to the image plane along the optical axis;
  • the object side of the first lens is a convex surface, and the image side is a concave surface, and the power is negative;
  • the object side of the second lens is a convex surface, and the image side is a concave surface, and the power is negative;
  • the object side of the third lens is a convex surface, and the image side is a convex surface, and the power is positive;
  • the object side of the fourth lens is a convex surface, and the image side is a convex surface, and the power is positive;
  • the object side of the fifth lens is a concave surface, and the image side is a convex surface, and the power is negative;
  • the fourth lens and the fifth lens are glued together to form a combined lens, and the focal length f45 of the combined lens satisfies the following condition: 2 ⁇ f45 ⁇ 10, and satisfies TTL/EFL ⁇ 16.5, wherein TTL is the first lens object side of the optical system The distance from the apex to the imaging plane, EFL is the effective focal length of the optical system.
  • an embodiment of the present invention further provides a camera module.
  • the camera module includes at least an optical lens in which the high-pixel ultra-wide-angle optical system described above is mounted.
  • the embodiment of the invention is mainly composed of five lenses, the number of lenses is small, the structure is simple, the total length of the optical is small, and the volume is small; the different lenses are combined with each other and the optical power is reasonably distributed, and has a large aperture, a large viewing angle, a high pixel, and a very Good performance such as good heat dissipation.
  • FIG. 1 is a schematic structural view of an optical system or lens of the present invention
  • Figure 3 is a graph showing the MTF of the optical system or lens of the present invention at +25 ° C;
  • Figure 4 is a phase contrast diagram of the optical system or lens of the present invention at +25 ° C;
  • Figure 5 is a graph showing the MTF of -40 ° C of the optical system or lens of the present invention.
  • Figure 6 is a graph of the MTF at +85 °C of the optical system or lens of the present invention.
  • the high-pixel ultra-wide-angle optical system of the present embodiment is sequentially provided from the object plane to the image plane 7 along the optical axis: a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4. And the fifth lens 5.
  • the object surface side of the first lens 1 is a convex surface, and the image surface side is a concave surface, and its optical power 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 its power is negative;
  • the object surface side of the third lens 3 is a convex surface, and the image surface side is a convex surface, and the power is positive;
  • 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 surface side of the fifth lens 5 is a concave surface, and the image surface side is a convex surface, and the power is negative;
  • the fourth lens 4 and the fifth lens 5 are glued together to form a combined lens, and the focal length f45 of the combined lens satisfies the following condition: 2 ⁇ f45 ⁇ 10, and satisfies TTL/EFL ⁇ 16.5, wherein the TTL is the first lens 1 of the optical system The distance between the vertices of the object side and the imaging surface 7, the EFL is the effective focal length of the optical system.
  • the embodiment of the invention is mainly composed of five lenses, the number of lenses is small, the structure is simple, the total length of the optical is small, and the volume is small; the different lenses are combined with each other and the optical power is reasonably distributed, and has a large aperture, a large viewing angle, a high pixel, and a very Good performance such as good heat dissipation.
  • each lens of the optical system satisfies the following conditions:
  • f is the focal length of the entire optical system, which takes the effective focal length EFL value of the 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 fourth lens
  • the focal length, f5 is the focal length of the fifth lens.
  • each lens of the optical system satisfies the following conditions:
  • 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 focal length of the fifth lens 5.
  • the second lens 2, the fourth lens 4, and the fifth lens 5 are all plastic aspherical lenses. It can effectively eliminate the influence of spherical aberration on the performance of the lens, improve the resolution of the optical lens, effectively achieve the aberration difference, and reduce the processing difficulty and production cost of the lens.
  • the material refractive index Nd1 of the first lens 1 and the material Abbe constant Vd1 satisfy: 1.72 ⁇ Nd1 ⁇ 1.95, 40 ⁇ Vd1 ⁇ 60.
  • the structure is simple and can ensure good optical performance.
  • the material refractive index Nd2 of the second lens 2 and the material Abbe constant Vd2 satisfy: 1.45 ⁇ Nd2 ⁇ 1.65, 40 ⁇ Vd2 ⁇ 60.
  • the structure is simple and can ensure good optical performance.
  • the material refractive index Nd3 and the material Abbe constant Vd3 of the third lens 3 satisfy: 1.75 ⁇ Nd3 ⁇ 1.95, and 15 ⁇ Vd3 ⁇ 35.
  • the structure is simple and can ensure good optical performance.
  • the material refractive index Nd4 and the material Abbe constant Vd4 of the fourth lens 4 satisfy: 1.45 ⁇ Nd4 ⁇ 1.65, 40 ⁇ Vd4 ⁇ 60.
  • the structure is simple and can ensure good optical performance.
  • the material refractive index Nd5 and the material Abbe constant Vd5 of the fifth lens 5 satisfy: 1.55 ⁇ Nd5 ⁇ 1.65, and 20 ⁇ Vd5 ⁇ 40.
  • the structure is simple and can ensure good optical performance.
  • the aperture 6 of the optical system is located between the third lens 3 and the fourth lens 4. Used to adjust the intensity of the beam.
  • the aperture 6 is disposed on the side closer to the image side of the fourth lens 4. In the present embodiment, the positions of the lenses and the apertures 6 are fixed.
  • a band pass filter is disposed between the fifth lens 5 and the image plane 7. It can filter the infrared light in the environment to avoid red exposure of the image.
  • the focal length f of the optical system is 0.817 mm
  • the pupil index F No. is 2.0
  • the angle of view 2 ⁇ 203°
  • the focal length f1 of the first lens 1 is -1.525 mm
  • the second The focal length f2 of the lens 2 is -21.151 mm
  • the focal length f3 of the third lens 3 is 3.37.81 mm
  • the focal length f4 of the fourth lens 4 is 1.361 mm
  • the basic parameters of this optical system are shown in the following table:
  • S1, S2 correspond to the two surfaces of the first lens 1;
  • S3, S4 correspond to the two surfaces of the second lens 2;
  • S5, S6 correspond to the third lens Two surfaces of 3;
  • STO is the position of the aperture 6;
  • S8, S9 correspond to the two surfaces of the fourth lens 4;
  • S9, S10 correspond to the two surfaces of the fifth lens 5;
  • S11, S12 correspond to the fifth The two surfaces of the band pass filter between the lens 5 and the image plane 7;
  • the IMA is the image plane 7.
  • the surfaces of the second lens L2, the fourth lens L4, and the fifth lens L5 are aspherical shapes satisfying the following equation:
  • y is the radial coordinate
  • the unit is the same as the lens length unit
  • k is the conic quadratic coefficient
  • a 1 to a 5 are the radial coordinates respectively.
  • the values of the S3 surface and the S4 surface of the second lens L2, the S8 surface and the S9 surface of the fourth lens L4, and the aspherical surface of the S9 surface and the S10 surface of the fifth lens L5 are as follows:
  • the optical system in this embodiment has high resolution and very good athermalization performance.
  • the camera module includes at least an optical lens, and the high-pixel ultra-wide-angle optical system described above is mounted in the optical lens.
  • optical system and the camera module of the same use different lens combinations and reasonable distribution of power to achieve good performances such as large aperture, large viewing angle and high pixel.

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

Abstract

一种高像素超广角光学系统，沿光轴从物面到像面依次设有：第一透镜（1）、第二透镜（2）、第三透镜（3）、第四透镜（4）、以及第五透镜（5）；第一透镜、第二透镜的物面侧为凸面，像面侧为凹面，光焦度为负；第三透镜、第四透镜的物面侧为凸面，像面侧为凸面，光焦度为正；第五透镜的物面侧为凹面，像面侧为凸面，其光焦度为负；其中，第四透镜和第五透镜相互胶合形成组合透镜，组合透镜的焦距f45满足如下条件：2＜f45＜10，且满足TTL/EFL≤16.5。另一方面，还提供了一种摄像模组。高像素超广角光学系统由5枚透镜构成，透镜枚数少，结构简单；光学总长短，体积小；具有大孔径、大视角、高像素、以及非常好的消热差等良好性能。

Description

高像素超广角光学系统及其应用的摄像模组 技术领域
在此处键入技术领域描述段落本发明涉及一种光学系统及其应用的镜头，尤其是一种高像素超广角光学系统及其应用的摄像模组。
背景技术
随着全景镜头摄像技术的应用、以及全景泊车系统的开发利用，市场上出现了一系列超广角镜头产品：如公开号CN106019540A的专利申请提到一种鱼眼光学镜头，但该镜头采用了6枚镜片，存在镜片数量多，成本高的缺陷。
发明概述
技术问题
为克服现有光学系统或镜头存在镜片数量多，成本高的问题，本发明实施例一方面提供了一种高像素超广角光学系统。
问题的解决方案
技术解决方案
高像素超广角光学系统，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、以及第五透镜；
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，像面侧为凸面，其光焦度为正；
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，其光焦度为负；
其中，第四透镜和第五透镜相互胶合形成组合透镜，组合透镜的焦距f45满足如下条件：2＜f45＜10，且满足TTL/EFL≤16.5，其中TTL为光学系统的第一透镜物面侧顶点至成像面之间的距离，EFL为光学系统的有效焦距。
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高像素超广角光 学系统。
发明的有益效果
有益效果
本发明实施例，主要由5枚透镜构成，透镜枚数少，结构简单；光学总长短，体积小；采用不同透镜相互组合及合理分配光焦度，具有大孔径、大视角、高像素、以及非常好的消热差等良好性能。
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为本发明的光学系统或镜头的结构示意图；
图2为本发明的光学系统或镜头的+25℃下的畸变曲线图；
图3为本发明的光学系统或镜头的+25℃下的MTF曲线图；
图4为本发明的光学系统或镜头的+25℃下的相对照度图；
图5为本发明的光学系统或镜头的-40℃下的MTF曲线图；
图6为本发明的光学系统或镜头的+85℃下的MTF曲线图。
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，本实施例之高像素超广角光学系统，沿光轴从物面到像面7依次设有：第一透镜1、第二透镜2、第三透镜3、第四透镜4、以及第五透镜5。
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，像面侧为凸面，其光焦度为正；
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，其光焦度为负；
其中，第四透镜4和第五透镜5相互胶合形成组合透镜，组合透镜的焦距f45满足如下条件：2＜f45＜10，且满足TTL/EFL≤16.5，其中TTL为光学系统的第一透镜1物面侧顶点至成像面7之间的距离，EFL为光学系统的有效焦距。
本发明实施例，主要由5枚透镜构成，透镜枚数少，结构简单；光学总长短，体积小；采用不同透镜相互组合及合理分配光焦度，具有大孔径、大视角、高像素、以及非常好的消热差等良好性能。
进一步地，该光学系统的各透镜满足如下条件：
(1)-8.5＜f1/f＜-3.5；
(2)-5.5＜f2/f＜-1.5；
(3)3.0＜f3/f＜10.0；
(4)0.8＜f4/f＜3.0；
(5)-5.5＜f5/f＜-1.5；
其中，f为整个光学系统的焦距，其取光学系统的有效焦距EFL值，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。通过不同透镜的相互组合及其合理分配光焦度，使光学系统具有大孔径、大视角、高像素、以及非常好的消热差等良好性能。
再进一步地，该光学系统的各透镜满足如下条件：
(1)-10＜f1＜-3；
(2)-5＜f2＜-1；
(3)2＜f3＜10；
(4)0.8＜f4＜4.5；
(5)-8＜f5＜-1；
其中，
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。通过不同透镜的相互组合及其合理分配光 焦度，使光学系统具有大孔径、大视角、高像素、以及非常好的消热差等良好性能。
更进一步地，所述第二透镜2、第四透镜4、以及第五透镜5均为塑料非球面透镜。可以有效地消除球面像差对镜头性能的影响，提高光学镜头的解析力，可以有效地实现消热差，同时降低镜头的加工难度和生产成本。
具体地，第一透镜1的材料折射率Nd1、材料阿贝常数Vd1满足：1.72＜Nd1＜1.95，40＜Vd1＜60。结构简单，可以保证良好的光学性能。
更具体地，第二透镜2的材料折射率Nd2、材料阿贝常数Vd2满足：1.45＜Nd2＜1.65，40＜Vd2＜60。结构简单，可以保证良好的光学性能。
再具体地，第三透镜3的材料折射率Nd3、材料阿贝常数Vd3满足：1.75＜Nd3＜1.95，15＜Vd3＜35。结构简单，可以保证良好的光学性能。
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：1.45＜Nd4＜1.65，40＜Vd4＜60。结构简单，可以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：1.55＜Nd5＜1.65，20＜Vd5＜40。结构简单，可以保证良好的光学性能。
再进一步地，光学系统的光阑6位于第三透镜3与第四透镜4之间。用来调节光束的强度。优选地，光阑6设置在第四透镜4靠近像方侧，在本实施例中，各透镜及光阑6的位置是固定的。
更进一步地，所述第五透镜5与像面7之间设有带通滤光片。可过滤环境中的红外光，以避免图像产生红曝现象。
具体地，在本实施例中，本光学系统的焦距f为0.817mm，光阑指数F No.为2.0，视场角2ω＝203°，第一透镜1的焦距f1＝-5.125mm，第二透镜2的焦距f2＝-2.151mm，第三透镜3的焦距f3＝33.781mm，第四透镜4的焦距f4＝1.361mm，第五透镜5的焦距f5＝-3.096mm。本光学系统的各项基本参数如下表所示：
[Table 1]
Figure PCTCN2017116810-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；STO是光阑6所在位置；S8、S9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；S11、S12对应为位于第五透镜5与像面7之间的带通滤光片的两个表面；IMA为像面7。
更具体地，所述第二透镜L2、第四透镜L4、以及第五透镜L5的表面为非球面形状，其满足以下方程式：
Figure PCTCN2017116810-appb-000002
Figure PCTCN2017116810-appb-000003
Figure PCTCN2017116810-appb-000004
其中，参数c＝1/R，即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，a 1至a 5分别为各径向坐标所对应的系数。所述第二透镜L2的S3表面和S4表面、第四透镜L4的S8表面和S9表面、以及第五透镜L5的S9表面和S10表面的非球面相关数值如下表所示：
[Table 2]
Figure PCTCN2017116810-appb-000005
从图2至图6中可以看出，本实施例中的光学系统具有高分辨率和非常好的消热差性能。
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高像素超广角光学系统。
本光学系统及其应用的摄像模组，采用不同镜片组合以及合理分配光焦度实现了大孔径、大视角、高像素等良好性能。
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. 高像素超广角光学系统，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、以及第五透镜；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，像面侧为凸面，其光焦度为正；
    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，其光焦度为负；
    其中，第四透镜和第五透镜相互胶合形成组合透镜，组合透镜的焦距f45满足如下条件：2＜f45＜10，且满足TTL/EFL≤16.5，其中TTL为光学系统的第一透镜物面侧顶点至成像面之间的距离，EFL为光学系统的有效焦距。
  2. 根据权利要求1所述的高像素超广角光学系统，其特征在于，该光学系统的各透镜满足如下条件：
    (1)-8.5＜f1/f＜-3.5；
    (2)-5.5＜f2/f＜-1.5；
    (3)3.0＜f3/f＜10.0；
    (4)0.8＜f4/f＜3.0；
    (5)-5.5＜f5/f＜-1.5；
    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。
  3. 根据权利要求1所述的高像素超广角光学系统，其特征在于，该光学系统的各透镜满足如下条件：
    (1)-10＜f1＜-3；
    (2)-5＜f2＜-1；
    (3)2＜f3＜10；
    (4)0.8＜f4＜4.5；
    (5)-8＜f5＜-1；
    其中，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。
  4. 根据权利要求1、2或3所述的高像素超广角光学系统，其特征在于，所述第二透镜、第四透镜、以及第五透镜均为非球面透镜。
  5. 根据权利要求1、2或3所述的高像素超广角光学系统，其特征在于，第一透镜的材料折射率Nd1、材料阿贝常数Vd1满足：1.72＜Nd1＜1.95，40＜Vd1＜60。
  6. 根据权利要求1、2或3所述的高像素超广角光学系统，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：1.45＜Nd2＜1.65，40＜Vd2＜60。
  7. 根据权利要求1、2或3所述的高像素超广角光学系统，其特征在于，第三透镜的材料折射率Nd3、材料阿贝常数Vd3满足：1.75＜Nd3＜1.95，15＜Vd3＜35。
  8. 根据权利要求1、2或3所述的高像素超广角光学系统，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：1.45＜Nd4＜1.65，40＜Vd4＜60。
  9. 根据权利要求1、2或3所述的高像素超广角光学系统，其特征在于，第五透镜的材料折射率Nd5、材料阿贝常数Vd5满足：1.55＜Nd5＜1.65，20＜Vd5＜40。
  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任一项所述的高像素超广角光学系统。
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