CN103547851B - 低电感光源模块 - Google Patents

低电感光源模块 Download PDF

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CN103547851B
CN103547851B CN201280022418.1A CN201280022418A CN103547851B CN 103547851 B CN103547851 B CN 103547851B CN 201280022418 A CN201280022418 A CN 201280022418A CN 103547851 B CN103547851 B CN 103547851B
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D·曼德宝姆
D·科恩
G·叶海弗
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Abstract

本发明的一个实施例提供了包括连接器以及半导体光源的低电感光源模块,该连接器具有夹在第一和第二导电层之间的绝缘材料层,该半导体光源安置在延伸通过第一导电层和绝缘层的凹陷中并具有电连接到第一和第二导电层的用于接收电力的第一和第二电接触。

Description

低电感光源模块
背景
配置用于产生高频重复的光脉冲串的照明系统被用作频闪快速摄影灯,用于研究物理学、化学和生物学中的超快过程。这样的照明系统也被用于提供飞行时间(TOF)相机中的光脉冲,该相机常被称为TOF三维(3D)相机,提供至其成像的场景中的特征的距离测量。
“TOF-3D”相机通过获取场景的图像(常规上被称为“区域图像”)来确定至该场景中的特征的距离,该图像可被处理以确定光从相机行进至这些特征并返回到相机要多久。从区域图像确定的光去往特征并从该特征返回的往返飞行时间以及光的速度被用来确定至该特征的距离。
在一些TOF-3D相机中,为了获取适合用于进行处理以确定飞行时间的区域图像,光源发射一串短时长光脉冲以照亮场景。在光脉冲串中的每个光脉冲的发射之后的预定时延之后,使相机快门打开达一短曝光时段。在该曝光时段期间来自光脉冲的被场景中的特征反射且抵达相机的光由相机成像在相机的光电传感器的像素上。由一给定像素记录的来自串中的所有光脉冲的光的量被用来确定光往返于成像在该给定像素上的一特征的往返飞行时间,以及从中确定至该特征的距离。
由光源发射的光脉冲串中的光脉冲用来对由TOF-3D相机成像的场景进行照明,并且TOF-3D相机的曝光时段可具有如几纳秒那么短的持续时间以及大于兆赫(MHz)的重复频率。此外,场景中的特征从所发射的光脉冲反射的光的量通常是有限的。结果,从成像在某一像素上的特征可获得的反射光可能不足以确定到该特征的具有可接受的信噪比(SNR)的距离。
通过增大由光源提供的光强度来对限制可用于获取可接受的测距图像的光的因子进行补偿通常既是技术方面又是成本方面的挑战。成本考虑以及用于使光源和相机维持在可接受的操作温度的散热要求常常限制了由光源提供的照明强度。如上所述,由光源所提供的光脉冲的可能超过一兆赫(MHz)高重复速率所要求的快速开关需求以及系统的电子和光学组件具有小的覆盖区(footprint)的常见需求一起构成了挑战。电子组件的覆盖区在常规上是指电路板上组件占据的区域的大小。如果电路占据的体积是要考虑的相关特性,则组件占据的体积可被理解为组件的覆盖区。
概述
本发明的一个实施例提供光源模块,该光源模块包括半导体光源和低电感电连接器,该低电感电连接器机械地支持光源并提供用于将它电连接到电源的导体。电连接器包括夹在第一和第二导电层之间的绝缘材料层。在连接器中形成的凹陷延伸通过第一导电层和绝缘层以暴露第二导电层的一个区域。光源安置在凹陷中使得它与第二导电层的暴露的区域接触并由短导电引线电连接到第一导电层。导电层相对宽而间隔近,并用作将光源连接到电源的导体。由电源提供的电流在导体中流动以大致相反的方向往返光源。配置用于承载相反方向的电流的间隔近的宽导体向光源提供到电源的低电感连接。
低电感连接有助于光源对可从向光源供电的电源得到的能量的高效利用,也用于缓和瞬态电压摆动,该瞬态电压摆动在光源被用于产生高重复频的短光脉冲时可伴随着对光源进行高频率接通和切断而发生。宽导体还提供热传导通道用于光源运转所产生热量的高效消散。
在本发明的一个实施例中,连接器被配置来容易地连接到印刷电路板(PCB),使得导体接触连接到电路的PCB中的导电轨迹,用于给光源供电和/或控制光源。连接器可被格式化成具有有利的小覆盖区。在本发明的一个实施例中,连接器耦合到包括光学器件的透镜筒,该透镜筒配置并导向由光源提供的光,以提供用于照亮所希望的视野的光束。连接器的分层结构便于相对高效和低价地同时生产多个光源模块。
提供本概述是为了以简化的形式介绍将在以下详细描述中进一步描述的选择的概念。本概述并不旨在标识所要求保护主题的关键特征或必要特征,也不旨在用于限制所要求保护主题的范围。
附图说明
以下参考本文所附的在本段后列出的各个附图来描述本发明的各实施例的非限制性示例。在不止一个附图中出现的相同的结构、元素或部件通常在它们出现的所有图中用相同的数字来标记。附图中所示的组件的尺寸和特征通常是为了方便和清楚呈现而选择的,并且不一定按比例显示。
图1A-D示意性地示出了根据本发明各实施例的包括安装到低电感电连接器的光源的光源模块;
图2示意性地示出了根据本发明一实施例的耦合到透镜筒的如图1A所示的光源模块的剖切示图;
图3示出了根据本发明一实施例的用于驱动类似于图2中所示的光源模块的电路的示意图;以及
图4A和4B示意性地示出了根据本发明一实施例的同时生产多个类似图1A-1D所示的光源模块的光源模块的生产过程的各阶段。
详细描述
在下面的详细描述的段落中,参考图1A和1B讨论根据本发明各实施例的光源模块及其组件,给出了提供各图中所示的光源模块的特征和组件的示例维度的用数字表示的示例。图1A中所示的光源模块示意性地示为安装到图2中的透镜筒中,讨论透镜筒的特征及其与光源模块的配合。接着参考图3描述光源的运行和供电。参考图4描述同时生产多个类似图1A和1B所示的光源模块的光源模块的方法。
在讨论中,除非另行说明,修改本发明的实施例的特征的条件或关系特性的诸如“基本上”和“大约”的形容词应被理解为该条件或特性被定义为针对该实施例所意图的应用在该实施例的操作可接受的容差范围以内。
图1A示意性地示出,包括低电感连接器30的光源模块20,半导体光源50安装在低电感连接器上。作为示例,光源50可包括用于以高重复速率提供短光脉冲来用在TOF-3D相机中的激光器二极管、垂直腔表面发射激光器(VCSEL)、和/或边缘发射激光器。作为示例,在图1A及后续的图中,光源50被假定为边缘发射器二极管激光器光源。
连接器30包括被分别夹在第一和第二导体31和33之间的绝缘材料层32,绝缘材料诸如陶瓷、玻璃、合适的聚合物,或诸如印刷电路板的化合物材料。导体31和33可从任何合适的导电材料形成,并且可选地由一片金属或金属合金(诸如铜,银,镀有镍、钯、或金的铜)制成。导体被用各种粘接材料(环氧树脂或粘合剂)的任何一种来粘接到绝缘层32。可选地,连接器30包括两个绝缘“肩部”35和37,被示为,可选地通过包括粘合剂或环氧树脂的粘接材料层36,分别粘接到导体31和33。肩部35、导体31和绝缘层32中的材料被移除以形成相对小的“有台阶的”凹陷40,凹陷40暴露区域41,以下称第一导体31的“接触”区域41。凹陷延伸到第二导体33来暴露一区域,以下称第二导体的安装区域42。
光源50安置在凹陷40中并用导电的粘合剂或环氧树脂粘接到第二导体33的安装区域42,使得光源的阴极(未示出)电连接到第二导体。接合线52把光源的阳极(未示出)电连接到接触区域41从而电连接到第一导体31。凹陷40的尺寸被做得相对小使得接合线52相对短。可选地,接合线为导电材料的带状的、相对平的条。
包括肩部35和37以下的绝缘层32和导体31和33的夹合的部分44,用作凸形插头用于插入匹配的插槽以将导体连接到供电和/或控制光源的驱动电路。可选地,匹配的插槽是包括在PCB中的插槽,并且当部分44插入插槽时,导体31和33与PCB上的连接到供电和/或控制光源的驱动电路的电迹线进行电接触。肩部35和37可用于限制导体31和33插入插槽的深度,并可安置在插槽的边沿以帮助机械地把连接器稳定在插槽中。由驱动电路提供的用于供电和/或控制光源50的电流“向上”沿着导体31和33之一流入光源50,并离开光源并沿着导体31和33的另一个“向下”流回驱动电路。
图1B示意性地示出了光源模块20的变体120,除了代替光源模块20中的绝缘层32的绝缘层132,变体120和光源模块20一样。绝缘层132具有边界区域133,其突出于导体31和33,以提供增强的保护防止在给光源50供电时导体间的电击穿。
图1C示意性地示出了光源模块20的另一个变体122,除了代替光源模块20中的绝缘肩部35和37的绝缘肩部135和137,变体122和光源模块20一样。
图1C示意性地示出了光源模块122的变体150,适于使用表面安装技术(SMT)方便地安装到PCB。可选地,除了移除了光源模块122的延伸至肩部135和137以下的部分44,使得层31、32、33分别具有与肩部135和137的底边沿表面140共面的边沿表面141、142和143,光源模块150和光源模块122一样。光源模块150可容易地通过将该模块放在PCB的表面使得边沿表面141和143接触PCB上的导电板并将边沿表面粘接到板,而被表面安装到PCB。
导体的电感通常随着导体的长度的减小而线性减小,并且按照导体宽度的倒数的对数。配置有在彼此相反的方向上运送电流的并联导体的电路的电感随着导体之间的距离的减小而减小。根据本发明的一个实施例,通过使得导体31和33相对较短、宽且间隔近,并安排导体承载反向的电流,连接器30以相对低的电感来表征,用于将光源50连接到电源。配置凹陷40使得光源直接电连接到导体33,并通过相对短且宽的接合线52电连接到导体31,进一步有助于减少连接器30的电感。除了向光源50提供电流以外,短和宽的导体31和33还用作散热片和热导体用于移除由光源在其运行时产生的热。
根据本发明的一个实施例,使用低电感连接器(诸如连接器30)将光源50连接到电源,对于控制光源以高重复速率产生光脉冲是有利的,且通常改善来自电源的对光源可用的能量的使用效率。
将电源电连接到光源的连接器中的电感有助于限制光源可被多快地打开和关闭,以及作为结果,可使得由光源提供的光脉冲有多短,以及可被多快地重复。用于以高重复速率生成短持续时间光脉冲的快速开关电路中的电感也会有助于在该电路中产生瞬态电压,这些瞬态电压可能损坏该电路。并且电感易于生成提供给光源的电压与电流之间的不期望的相位差,这些相位差降低了电源将能量耦合到光源中的效率。提供用于将光源耦合至电源的低电感连接器有助于缓和潜在的电感的性能限制效应。
作为数值示例,在本发明的一实施例中,连接器30具有小于或等于大约5mm的高度“H”和小于或等于大约4mm的宽度“W”。可选地,H小于或等于大约2.5mm。W可小于或等于大约3mm。在本发明的一实施例中,H等于大约3.6mm,而W等于大约2.8mm。在另一个实施例中,H等于大约1.8mm,而W等于大约2mm。
在本发明的一个实施例中,绝缘层32、导体31和33以及绝缘肩部35和36各自具有小于或等于大约0.5mm的厚度。可选地,厚度小于或等于大约0.4mm。在本发明的一个实施例中,厚度小于或等于大约0.3mm。导体31和33可具有大约0.1和大约0.2mm之间的厚度。绝缘层32和绝缘肩部35和37可具有大约0.2mm和大约0.3mm之间的厚度。可选地,粘接层36可具有小于或等于大约0.2mm的厚度。可选地,粘接层的厚度等于大约0.15mm。
尽管凹陷40被配置来具有适应特定型号的光源50的尺寸,以此尺寸,凹陷40被使用并将光源电连接到导体33的安装区域42和导体31的接触区域41,示例性凹陷40在肩部绝缘体35中具有平行于H的高度和平行于W的宽度,分别小于或等于大约1mm和1.5mm。可选地,安装区域42具有分别小于或等于大约1mm和1.1mm的高度和宽度(分别平行于H和W)。在本发明的一个实施例中,凹陷40在绝缘肩部35中具有分别等于大约0.8mm和1.2mm的高度和宽度,且安装区域42是正方形且具有等于大约0.8mm的边长。绝缘肩部35和37可选地具有小于或等于大约1.6mm的高度。
在本发明的一个实施例中,将光源50连接至导体31的接合线引线52具有小于或等于大约0.75mm的长度。可选地,接合线小于0.5mm。在本发明的一些实施例中,接合线52具有小于或等于大约0.4mm的长度。
在本发明的一个实施例中,连接器30以小于或等于大约3nH(毫微亨)的电感来表征。在本发明的一些实施例中,连接器30以小于或等于大约2.5nH的电感来表征。对于具有分别等于大约2.6mm和4.5mm的高度H和宽度W的导体31和33,连接器30向控制光源50发射光脉冲的电路提供小于或等于大约2.3nH的电感。表征以上所述的大小的连接器的电感小于导体的常规配置,常规配置通常由等于或大于大约4nH的电感来表征。
在本发明的一个实施例中,光源模块20耦合到从光源50接收并成形光的光学器件,以提供配置用于提供希望的照明图案的照明系统。作为示例,图3示意性地示出根据本发明的一个实施例的包括光源模块20的照明系统200的剖切立体图。
照明系统200包括透镜筒202,可选地,透镜筒具有安装到环状透镜框架206的准直透镜204和矩形漫射器208。作为例子,透镜筒202可以用诸如铝的金属或诸如聚苯乙烯或聚苯乙烯生聚物的高冲击强度塑料制造,并被形成为具有圆形内腔210,在其一端形成壁架211。透镜框架206安置在壁架211上并可使用本领域中已知的任何不同方法和装置来维持在位。例如,透镜框架可选地被按压适合到内腔210中和/或由合适的粘合剂或或环氧树脂来粘接到壁架211。漫射器208安置在形成在透镜筒202的可选的矩形凹陷214的壁架212上,并被可选地按压适合到凹陷中和/或用粘接材料粘接到壁架。
光源模块20安置在凹陷220上,凹陷220形成在透镜筒202中具有匹配于接收并使得光源模块插入的形状和深度,使得光源模块固定在凹陷中并且大致仅凸形插头44从透镜筒202伸出。可使用任何不同的方法和装置将光源模块固定在凹陷220中,并且可以例如通过按压适合到凹陷中和/或通过使用环氧树脂或粘合剂粘接到凹陷的表面来固定。通过将光源模块的延伸在绝缘肩部35和37以下的插头44插入合适的插槽,照明系统200可被插入该插槽以接收电力用于给光源50供电。
在本发明的一个实施例中,准直透镜204从光源50接收光(所述光示意性地由波状箭头51表示),使光准直并将其导向到漫射器208。来自光源的光51从光源离开并以光锥(未示出)传播,所述光锥常常不具有圆形横截面,但是通常展示伸长的大致上椭圆状的横截面。漫射器208可选地是矩形,如图3所示,以适合来自光源的光51的椭圆状的横截面。漫射器208和光源模块20通过凹陷214和220在透镜筒202中放置并对齐,其中它们分别被持有使得漫射器的长维度与来自光源50的光的椭圆状横截面的主轴相平行。漫射器208可选地将它从光源50接收的光配置成金字塔形锥形光束,其外围示意性地由虚线220表示,其数字也用以指锥形光束,用于照亮所希望的视野(FOV)(未示出)。可选地,锥形光束220被配置用于照亮3D-TOF相机的FOV。
根据本发明的一个实施例,相对较小的覆盖区是诸如照明系统200之类的照明系统的特征。作为数值示例,在本发明的一个实施例中,照明系统200具有小于或等于大约9mm的高度H200。可选地,H200小于或等于大约6mm。照明系统的最大宽度W200小于或等于大约6mm。在本发明的一些实施例中,W200等于或小于4mm。
图3示意性示出了根据本发明的一实施例的耦合至电路300的照明系统200,该电路对照明系统供电并控制照明系统发射以具有脉冲宽度为“Pw”且重复频率为“ν”的脉冲为特征的一串光脉冲302。该脉冲在锥形光束220中从该照明系统传播开。
电路300包括电源320,该电源具有接地的第一负端子321以及连接到导体31的第二正端子322。导体33连接到开关326。驱动器328选择性地控制开关以将导体33接地或使其与地断开。当开关326将导体33接地时,电流从电源320流过光源50且光源发射光。当开关326将导体33与地断开时,电流停止流过光源50,且光源停止发射光。开关326是以相对于脉冲宽度Pw而言较短的升降时间为特征的开关,并且具有与由光源50和导体31和33对电路300贡献的阻抗和电感相比相对较小的阻抗和电感。
驱动器328可选地响应于由脉冲串330示意性表示的输入信号控制开关326重复地接通和切断,并由此以重复频率ν在具有持续时间Pw的时段内将导体33接地。结果,照明系统200以重复频率ν发射具有基本上等于Pw的脉冲宽度的光脉冲302。在本发明的一实施例中,如通过以下给出的示例,强度I、光脉冲宽度Pw以及发射重复频率ν适于提供供TOF3D相机获取场景的区域图像的光脉冲。
在本发明的一实施例中,Pw小于或等于大约20ns。可选地,Pw小于或等于大约15ns。在本发明的一些实施例中,Pw大约等于5ns。可选地,重复频率ν等于或大于250kHz。在本发明的一些实施例中,ν大于或等于大约1MHz。可选地,重复频率大于或等于大约5MHz。
作为适用于TOF3D相机的本发明的一实施例的示例,光源50是可选地由OSRAM光学半导体公司(OSRAM Opto Semiconductors Inc.)出售的具有目录号SPL-PL85-3的边缘发射激光器,其提供等于大约850nm(纳米)的IR波长的光脉冲。开关326可以是金属氧化物半导体场效应晶体管(MOSFET),诸如由Fairchild半导体公司出售的目录号FDMS8692下的MOSFET。开关FDMS8692具有小于或等于大约10mΩ(毫欧)的阻抗、小于或等于大约0.5nH(毫微亨)的电感。该开关以分别具有小于大约3ns(纳秒)的升降时间的开和关(导通和非导通)状态之间的开关速度为特征。可选地,开关326被脉冲串330接通或切断,以控制SPL-PL85-3激光器产生具有等于大约15ns的脉冲宽度Pw和等于大约0.5MHz的重复频率ν的光脉冲。
为了用在TOF3D相机中,光脉冲302可具有大约25瓦的峰值功率,并且对于8ns(FWHM)的脉冲宽度和0.5MHz的重复频率,提供大约90mW(毫瓦)的光功率。假定照明系统200具有等于以上所提及的2.3nH的电感,则电源320向照明系统提供大约300mW的电功率。照明系统将电功率转换成光功率的效率因此为大约30%。根据本发明的一个实施例,连接器30的配置所导致的电感的进一步减少可大致与减少的量级成线性地提高效率。
具有等于大约4nH的电感且在相同重复频率下产生相同光脉冲的常规照明系统通常展示出小于大约27%的将电能转换成光能的效率。根据本发明的一实施例的导体的配置,诸如由导体30和40展示的,因此提供大约26%到大约33%之间的能量转换的改进。
根据本发明的一个实施例,由于它们的设计,多个光源模块,诸如图1A和1B所示的光源模块20和120,可相对高效地同时生产。
例如,导电和绝缘层可被粘接在一起以形成图4A中示意性示出的堆叠400,其包括两个外绝缘层435和437,被绝缘层432分开的两个导电层431和433夹在外绝缘层435和437之间。堆叠400可接着被处理以从堆叠的第一侧形成凹陷40、导体31和绝缘肩部35(图1A和1B)的行和列的有次序的阵列,并从堆叠的第二侧形成绝缘肩部37(图1A和1B)和导体33的行和列的阵列(绝缘肩部35和导体31的阵列的镜像图像)。可使用本领域已知的任何不同方法和装置来形成阵列。例如,阵列可通过光刻处理、化学蚀刻、激光切削,和/或微机械加工来形成。在阵列形成之后,光源50可使用拾取与放置和接合线连接过程被连接到导体31和33。如图4B示意性地示出的光源模块20的结果阵列,形成在绝缘层432上并由绝缘层432连接,并且可以随后被切块以分隔光源模块。
在本申请的说明书和权利要求书中,动词“包括”、“包含”和“具有”及其组合中的每一个是用来指示该动词的一个或多个宾语不一定是该动词的一个或多个主语的组件、元素、或部分的完整列表。
在本申请中作为示例提供了对本发明的各实施例的描述,而不旨在限制本发明的范围。所描述的各实施例包括不同特征,并非所有这些特征都是本发明的所有实施例所需的。某些实施例只利用了特征的某一些或特征的可能组合。本领域的技术人员会想到所描述的本发明的各实施例的变型以及本发明的各实施例包括在所描述的各实施例中注明的特征的不同组合。本发明的范围只由权利要求书来限定。

Claims (10)

1.一种低电感光源模块,包括:
连接器,所述连接器包括夹在第一和第二导电层之间的绝缘材料层,并在连接器中形成凹陷,所述凹陷延伸通过所述第一导电层和所述绝缘层以暴露所述第二导电层的一个区域;以及
半导体光源,所述半导体光源具有第一和第二电接触,用于接收激励光源以发射光的电力;
其中所述光源安置在所述凹陷中,并使得所述第一电接触电连接到所述第一导电层且使得所述第二电接触电连接到所述第二导电层的所暴露的区域,所述第一和第二导电层、所述绝缘材料层与所述连接器在垂直于所述光源沿着其发射光的方向上等宽。
2.如权利要求1所述的光源模块,其特征在于,所述第二电接触是通过导电媒介被直接粘接到所述第二导电层的暴露区域的。
3.如权利要求1或2所述的光源模块,其特征在于,所述第一电接触是沿着所述凹陷的边沿被连接到所述第一导电层的区域的。
4.如权利要求3所述的光源模块,其特征在于,所述第一电接触是通过至少一个接合线电连接到所述第一导电层的,所述接合线具有小于或等于0.5mm的长度。
5.如权利要求1所述的光源模块,其特征在于,包括第一和第二附加绝缘层,所述第一和第二附加绝缘层将所述各导电层夹在它们之间并分别粘接到所述第一和第二导电层。
6.如权利要求1所述的光源模块,其特征在于,所述各层具有小于或等于0.5mm的厚度。
7.如权利要求1所述的光源模块,其特征在于,所述连接器在所述光源沿着其发射光的方向上具有小于或等于5mm的高度。
8.如权利要求1所述的光源模块,其特征在于,所述连接器在垂直于所述光源沿着其发射光的方向上具有小于或等于3mm的宽度。
9.如权利要求1所述的光源模块,其特征在于,所述连接器以小于或等于3nH毫微亨的电感来表征。
10.一种照明系统,包括:
如前面任意一条权利要求所述的低电感光源模块;
具有在其中安置所述光源模块的凹陷的筒;
安置在所述筒中的透镜,所述透镜接收来自所述光源模块的光并对所接收的光进行准直;以及
安置在所述筒中的漫射器,所述漫射器接收来自所述透镜的经准直的光并漫射所接收的光。
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EP2707646B1 (en) 2016-09-28
US20120287646A1 (en) 2012-11-15
WO2012154510A3 (en) 2012-12-27
JP6141260B2 (ja) 2017-06-07
WO2012154510A2 (en) 2012-11-15
KR101992501B1 (ko) 2019-06-24
EP2707646A4 (en) 2014-10-29
JP2014514781A (ja) 2014-06-19
CN103547851A (zh) 2014-01-29
US8888331B2 (en) 2014-11-18
KR20140022875A (ko) 2014-02-25
EP2707646A2 (en) 2014-03-19

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