CN114270145B - 用于大行程线性位置感测的霍尔传感器-磁体几何结构 - Google Patents
用于大行程线性位置感测的霍尔传感器-磁体几何结构 Download PDFInfo
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Abstract
多个位置感测单元,包括:一磁性组件(MA),其具有沿一第一方向测量的一宽度W和沿一第二方向测量的一高度H,且其包括具有各自的磁极化的至少三个磁体,所述各自的磁极化沿所述第一方向定义至少一个左MA域、一个中MA域和一个右MA域,其中每个MA域的磁极化是不同的;以及一磁通量测量装置(MFMD),其用于测量一磁通量B,其中所述MA在满足1毫米≤L≤100毫米的一行程L内沿所述第一方向相对于所述MFMD移动,所述行程L开始于一第一点x0,结束于一终点xmax,且其中沿一特定MA域和所述MFMD之间的所述第二方向测量的一正交距离D的一最小值Dmin满足L/Dmin>10。
Description
相关申请案
本申请案主张2020年7月31日所申请的美国临时专利申请案号63/059,200的优先权,其全部内容通过引用并入本文。
技术领域
本文所公开的实施例一般涉及位置感测单元,尤其是涉及被包括在移动电子装置内的紧凑型数码相机中的位置感测。
背景技术
被集成在如智能手机或平板电脑等手持电子装置(“装置”)中的许多紧凑型数码相机使用如音圈电机(voice coil motor,VCM)或步进电机(stepper motor)等致动器,例如:用于沿具有一特定方向和范围(“行程”或“L”)的一轨迹驱动一摄像机镜头。所述驱动是由一位置感测单元来控制的,所述位置感测单元通常基于一磁性组件(magnet assembly,“MA”),所述磁性组件相对于一磁通量测量装置(magnetic flux measuring device,MFMD)移动,所述磁通量测量装置例如是一霍尔传感器(Hall sensor)。为了稳定控制,所述位置感测单元必须支持两个条件:a)其必须表现出线性行为,即其斜率S=ΔB/Δx在整个行程(“线性范围”)中必须是恒定的,其中ΔB是位于彼此一距离Δx的两个点之间的磁通量密度的变化,例如,所述位置感测单元的线性范围限制了所述行程;以及b)所述线性范围内的所述斜率S=ΔB/Δx必须足够陡峭,即其必须高于某个阈值,例如S>50毫特斯拉(mT)或S>200毫特斯拉。
图1A示出了一位置感测单元100的一第一已知示例,其包括一磁性组件(magnetassembly,“MA”)102。磁性组件102包括两个具有极化104的矩形磁体,所述磁性组件具有位于磁性组件102的对称轴(symmetry axis,“SA”)109(相对于y方向或者只是“相对于y”)的一宽度W102和一磁性组件中心“C”(相对于x方向或者只是“相对于x”)以及一磁通量测量装置106。磁性组件102在其周围产生一磁场108。磁通量测量装置106与磁性组件102保持一恒定的距离D=DC(沿y轴测量),其可以是DC=0.1毫米(mm)-2毫米。对于位置感测,磁性组件102在x方向上沿着一基本上直线且相对于磁通量测量装置106移动。当x从x0变化到xmax时(此为“行程”),磁性组件102沿直线(“x”)的位置发生变化。也就是说,磁性组件仅在所述行程内移动。D在x0和xmax之间基本上是恒定的,即D不是x的一函数。在图表107中,相对于磁性组件102的x位置,显示了由磁通量测量装置106测量的磁通量密度(“B”)。B是X的一函数,即B=B(x)。在从x0到xmax的行程L内,B的斜率S=(Bmax-B0)/L是线性的。在一些示例中,W102可以是0.6毫米至10毫米,L可以是0.5毫米至1毫米。在聚焦一摄像机镜头的一典型示例中,D=200微米(μm)且L=700微米,所以L和D的比率为L/D=3.5。对于许多致动器感应示例,S是足够陡峭的。然而,L/D相对较小。
图1B示出了一位置感测单元110的一第二已知示例,所述位置感测单元110包括一磁性组件112,所述磁性组件112包括具有极化114和宽度W112的一单个矩形磁体以及一磁通量测量装置116。磁性组件112产生一磁场118。磁通量测量装置116是位于磁性组件102的距离D处。类似于图1A中所示,一磁体中心“C”(相对于x方向)是位于磁性组件102的一对称轴119处(相对于y方向)。对于位置感测,磁性组件102相对于磁通量测量装置116在x方向上沿着一基本上直线且移动。D在x0和xmax之间基本上是恒定的。在图表117中,相对于磁性组件112的x位置,显示了由磁通量测量装置116测量的磁通量密度B。在一范围L内,B的斜率S=(Bmax-B0)/L是线性的。L/D可以是相对较大。然而,对于大多数致动器感应情况,S不是足够陡峭的。因此,这种设计在当今的装置中几乎没有被使用。
进入市场的新型长焦(Telephoto,“Tele”)相机具有较大的有效焦距(effectivefocal lengths,EFL),例如10毫米至40毫米用于大变焦系数和用于具有高物对像放大率的微距摄影,例如在5厘米(cm)至15厘米的物镜距离(“u”)下为1:1至15:1。将这类的大有效焦距相机聚焦到小至5厘米到15厘米的短物镜距离需要明显超过1毫米的大镜头行程。
使用薄镜头方程1/EFL=1/u+1/v(“v”是镜头图像距离)和EFL=25毫米的一长焦相机作为示例,对焦到10厘米(相对于聚焦到无穷远)需要约6.3毫米的镜头行程。目前在紧凑型相机产业中使用的位置感测单元无法支持控制如此大的镜头行程。需要大行程组件的进一步示例是,例如,(i)共同拥有的国际专利申请PCT/IB2020/051405中描述的一两态变焦相机、(ii)如共同拥有的国际专利申请PCT/IB2020/058697中所述的折叠一相机的总轨道长度(total track length,TTL)的一弹出机构,以及(iii)如2020年12月1日提交的共同拥有的美国临时专利申请号63/119,853中所述的一连续变焦相机。
需要一种具有一紧凑结构系数的一位置感测单元,这将是有益的,所述位置感测单元允许沿大行程L和足够大斜率S实现位置感测。
发明内容
在各种实施例中,提供了多个位置感测单元,包括:一磁性组件(magneticassembly,MA),所述磁性组件具有沿一第一方向测量的一宽度W和沿一第二方向测量的一高度H,并且所述磁性组件包括至少三个磁体,所述至少三个磁体具有各自的磁极化,所述各自的磁极化沿所述第一方向定义至少一个左磁性组件域、一个中磁性组件域和一个右磁性组件域,其中每个磁性组件域的磁极化是不同的;以及一磁通量测量装置(magneticflux measuring device,MFMD),所述磁通量测量装置用于测量一磁通量B,其中所述磁性组件被配置为在一行程L内沿所述第一方向相对于所述磁通量测量装置移动,所述行程L满足1毫米(mm)≤L≤100毫米,所述行程L开始于一第一点x0,结束于一终点xmax,且其中沿所述磁性组件的一特定磁性组件域和所述位置感测单元的所述磁通量测量装置之间的所述第二方向测量的一正交距离D的一最小值Dmin满足L/Dmin>10。所述磁体可以由一钕基材料(Neodymium based material)制成。
在一些实施例中,所述磁性组件具有平行于所述第二方向的一对称轴。在一些实施例中,所述对称轴是位于所述中磁性组件域的中心。
在一些实施例中,对于行程L内的不同位置,D不是恒定的。
在一些实施例中,L/Dmin>15。在一些实施例中,L/Dmin>20。
在一些实施例中,x0处的B为B0,xmax处的B为Bmax,且一斜率S=(B0-Bmax)/L是大于10毫特斯拉/毫米(mT/mm)。在一些实施例中,S是大于100毫特斯拉/毫米。在一些实施例中,S是大于1000毫特斯拉/毫米。在一些实施例中,S是大于2500毫特斯拉/毫米。
在一些实施例中,所述左磁性组件域的磁极化的方向朝向所述磁通量测量装置。
在一些实施例中,所述右磁性组件域的磁极化的方向远离所述磁通量测量装置。
在一些实施例中,所述中磁性组件域的磁极化的方向平行于或反向平行(anti-parallel)于所述第一方向。
在一些实施例中,如上或下的一位置感测单元可以被包括在一音圈电机(voicecoil motor,VCM)中。在一些实施例中,所述音圈电机包括四个线圈。在一些实施例中,所述音圈电机被包括在智能手机摄像头中。
在一些实施例中,所述磁通量测量装置是一霍尔传感器(Hall sensor)。
在一些实施例中,所述左磁性组件域和所述磁通量测量装置之间的D值为D(x0),所述右磁性组件域和所述磁通量测量装置之间的D值为D(xmax),所述中磁性组件域和所述磁通量测量装置之间的D值为D(xmax/2),其中D(x0)≤D(xmax/2),且D(xmax)≤D(xmax/2)。在一些实施例中,所述中磁性组件域和所述磁通量测量装置之间的D值为D(xmax/2),其中D(x0)=D(xmax)≤D(xmax/2)。
在一些实施例中,所述左磁性组件域、所述中磁性组件域和所述右磁性组件域为矩形。在一些实施例中,所述左磁性组件域和所述右磁性组件域为梯形,所述中磁性组件域为一凸五边形。在一些实施例中,所述左磁性组件域和所述右磁性组件域为梯形,所述中磁性组件域为一凹五边形。
在一些实施例中,所述磁性组件还包括具有各自的磁极化的一第四磁性组件域和一第五磁性组件域,其中所述第四磁性组件域是位于所述左磁性组件域的左侧,所述第五磁性组件域是位于所述右磁性组件域的右侧。在一些实施例中,所述第四磁性组件域的磁极化的方向远离所述磁通量测量装置。在一些实施例中,所述第五磁性组件域的磁极化的方向朝向所述磁通量测量装置。
在一些实施例中,L<20毫米(mm)。在一些实施例中,L<10毫米。在一些实施例中,L<7.5毫米。在一些实施例中,L<5毫米。
在一些实施例中,L/W>0.5。在一些实施例中,L/W>0.75。
在一些实施例中,L/H>3。在一些实施例中,L/H>5。
附图说明
下文参照附图对该段落之后所列出的本文中所公开的实施例的非限制性示例进行描述。附图和描述意在阐明和澄清本文中所公开的实施例,并且不应被视为以任何方式限制。不同附图中的相同元件可以用相同数字指示。
图1A示出了一位置感测单元的一第一已知示例;
图1B示出了一位置感测单元的一第二已知示例;
图2A在横截面上示出了本文所公开的一位置感测单元的一实施例;
图2B示出了图2A的所述位置感测单元中的一MA的一磁场分布;
图2C示出了由图2A的所述位置感测单元中的一MFMD感测的所述磁场密度;
图3在横截面上示出了本文所公开的一位置感测单元的另一实施例;
图4在横截面上示出了本文所公开的一位置感测单元的再一实施例;
图5A在横截面上示出了本文所公开的一位置感测单元的再一实施例;以及
图5B示出了本文所公开的的一音圈电机(voice coil motor,“VCM”)的一实施例。
具体实施方式
图2A显示了本文公开且标号为200的一位置感测单元的一实施例,其包括一磁性组件202和一磁通量测量装置206。图表207示出了由磁通量测量装置106测量的B与磁性组件102的x位置。图2B显示了磁性组件202的一磁场分布210。框212表示行程L内的y位置,其中如图2C所示的一磁通量密度214是由磁通量测量装置206来感测的。
磁性组件202包括具有各自的磁极化204a、204b和204c的三个矩形永久磁体202a、202b和202c。磁体202a和202c在形状和尺寸上相同,但各自的磁化204a和204c相反。磁体202a和202c相对于磁体202b被对称定位,即磁体202a和202c两者(i)是位于距磁体202b相同的距离d202处,且(ii)是位于相对于磁体202b的一相同的相对y座标ΔH处。磁性组件202的中心“C”是位于磁体202b和磁性组件202两者的对称轴(symmetry axis,SA)209处。磁性组件202的形状相对于y对称地围绕C。磁性组件202具有一宽度W202及一高度H202。
本文所述的磁体可由已知在产业中使用的任何材料制成,特别是在如智能手机等移动电子装置内使用的数码相机中,例如任何钕基材料(Neodymium based material),例如N48H、N48SH等。x0和xmax可选择为其中间点或对称点xS=xmax/2是位于C处,或者可以以其他方式选择它们。也就是说,所述行程相对于y的对称轴是位于xS=xmax/2,且可以与位于C处的磁性组件202的对称轴209(如图2A所示)相同,或者其可以位于另一个位置。
磁性组件202和磁通量测量装置206中包含的任何组件之间的正交距离被标记为“D”。“正交距离”意指其仅代表磁性组件202和磁通量测量装置206中包含的任何组件之间的距离的y组件。在点x0、C和xmax处的D值分别被标记为D(x0)、DC和D(xmax)。在x0和xmax处,D具有一最小值Dmin。
作为一示例,磁体202a和磁通量测量装置206之间的D是D(x0)且磁体202b和磁通量测量装置206之间的D是DC,而与磁体202a和202b分别与磁通量测量装置206之间的实际相对距离无关。至于磁性组件202和磁通量测量装置206的相对运动,通常一实际相对距离是由沿x测量的一距离分量和沿y测量的一距离分量组成。在此需要注意的是,D指的是一磁体和包括一磁通量测量装置的一封装装置之间的距离,而不是所述磁通量测量装置本身的距离。通常,一磁通量测量装置被包含在具有一外壳的一封装装置中,其中所述磁通量测量装置是位于距离所述外壳约50微米至250微米的一磁通量测量装置外壳处。为了计算一磁体和所述磁通量测量装置之间的距离,所述磁通量测量装置外壳距离必须被加入到D。此外,应注意D未按比例显示。
在本文所示的所有示例中,D(x0)和D(xmax)可以小于或等于满足D(x0),D(xmax)≤D(x)的D(x)。所述磁体的其中之一和所述磁通量测量装置之间的最近距离Dmin=D(x0)=Dmax。也就是说,D(x0)和D(xmax)是小于或等于此范围内的所有其他距离。在位置感测单元200中,D(x0)=D(xmax)<DC且L/Dmin>10。通常,Dmin≥0.1毫米。
在x0处,磁极化204a的方向基本上朝向磁通量测量装置206。在xmax处,磁极化204c的方向基本上远离磁通量测量装置206。在C处,磁极化204b的方向基本上平行于或反向平行(anti-parallel)于X。磁体202a、202b和202c分别定义了三个磁性组件域,分别为左、中和右磁性组件域,其中每个磁性组件域的磁极化是彼此不同的。
磁通量密度B是x的函数,即B=B(x)。在L中,B的斜率S=(Bmax-B0)/Δx是线性的。在以下所有示例中,S表示一理想线性斜率,例如216(请见图2C),其具有与一实际斜率214(请见图2C)相同的起点(x0,B0)和相同的终点(xmax,Bmax)。S的值在DC处给出。
如上所述,图2C中的图表207显示了磁通量密度与x的关系,因此它是“B与x的曲线”。实际磁通量密度斜率214是沿图2A中箭头L指示的坐标被感测。理想(线性)磁通量密度斜率216被示出用于比较。显然,实际磁通量密度斜率214偏离理想磁通量密度斜率216。
图3示出了本文公开并编号为300的一位置感测单元的另一实施例。单元300包括一磁性组件302和一磁通量测量装置306,所述磁性组件302包括具有各自的磁极化304a、304b和304c的三个永久磁体302a、302b和302c。磁体302a、302b和302c不是矩形的。磁体302a和302c具有相同的形状和尺寸,但磁化304a和304c相反。磁体302a和302c相对于302b被对称放置,即302a和302c两者是(i)位于距302b相同的距离d302处,且(ii)位于相对于302b的一相同的相对y坐标ΔH302处。磁性组件302的中心C(相对于x)是位于磁体302b和磁性组件302两者的对称轴309(相对于y)处。磁性组件302的形状相对于y对称地围绕C。
磁性组件302产生一磁场(未显示)。在C处,磁通量测量装置306是位于远离磁性组件302的DC处。磁性组件302相对于磁通量测量装置306在x方向上沿一行程移动。磁性组件302沿x的位置从x0变化到xmax。x0和xmax可以被选择,使其中间点或对称点xs=xmax/2位于C处,或者或者可以以其他方式选择它们。应注意D未按比例显示。
在x0和xmax之间,正交距离D是x的函数,D=D(x)。对于300,D(x0)=D(xmax)<DC、D(x0)=D(xmax)=Dmin,且L/Dmin>10。通常,Dmin≥0.1毫米。为了说明D的定义,D进一步显示在2个任意位置x1和x2,其中D分别由D(x1)和D(x2)给出。在x0处,磁极化304a的方向基本上朝向磁通量测量装置306。在xmax处,304c的方向基本上远离磁通量测量装置306。在C处,304b的方向基本上平行于或反向平行于x。磁体302a、302b和302c分别定义了三个磁性组件域,分别为左、中和右磁性组件域,其中每个磁性组件域的磁极化是彼此不同的。
相对于磁性组件202的x位置(B与x的曲线),显示了由磁通量测量装置306测量的B309。B是x的函数,即B=B(x)。在L中,B的S=(Bmax-B0)/Δx是线性的。表1中给出了示例值。S的值在DC处被给出。与磁性组件202相比,磁性组件302的优势在于,L内的B与x的曲线表现出更高的线性。也就是说,磁性组件302的B与x的曲线与一理想线性形状(如216)的变化小于磁性组件202的B与x的曲线。
表1
图4显示了本文公开且标号为400的一位置感测单元的的再一实施例。单元400包括一磁性组件402和一磁通量测量装置406,所述磁性组件402包括具有各自的磁极化404a、404b和404c的三个非矩形永久磁体402a、402b和402c。磁体402a和402c具有相同的形状和尺寸,但磁化404a和404c相反。磁体402a和402c相对于磁体402b被对称定位,即磁体402a和402c两者是(i)位于距磁体402b相同的距离d402处,且(ii)位于相对于磁体402b的一相同的相对Y座标ΔH402处。磁性组件402的中心C(相对于x)是位于磁体402b和磁性组件402两者的对称轴409(相对于y)处。磁性组件402的形状相对于y对称地围绕C。
磁性组件402产生一磁场(未显示)。在C处,磁通量测量装置406是位于远离磁性组件402的DC处。磁性组件402相对于磁通量测量装置406在x方向上沿一行程移动。磁性组件402沿x的位置从x0变化到xmax。x0和xmax可以被选择,使其中间点或对称点xs=xmax/2位于C处,或者或者可以以其他方式选择它们。
在x0至xmax之间,正交距离D是x的函数,D=D(x)。对于400,D(x0)=D(xmax)<DC、D(x0)=D(xmax)=Dmin,且L/Dmin>10。通常,Dmin≥0.1毫米。在x0处,磁极化404a的方向基本上朝向磁通量测量装置406。在xmax处,404c的方向基本上远离磁通量测量装置406。在C处,404b的方向基本上平行于或反向平行于x。磁体402a、402b和402c分别定义了三个磁性组件域,分别为左、中和右磁性组件域,其中每个磁性组件域的磁极化是彼此不同的。应注意D未按比例显示。
相对于磁性组件202的x位置,显示了由磁通量测量装置406测量的B409。B是x的函数,即B=B(x)。在L中,B的S=(Bmax-B0)/Δx是线性的。表2中给出了位置感测单元400的示例值。S的值在DC处被给出。与磁性组件202相比,磁性组件402的优势在于,L内的B与x的曲线表现出更高的线性。
表2
图5A显示了本文公开且标号为500的一位置感测单元的再一实施例。单元500包括一磁性组件502和一磁通量测量装置506,所述磁性组件502包括具有各自的磁极化504a、504b、504c、504d和504e的五个永久磁体502a、502b、502c、502d和502e。磁体502a、502b和502c不是矩形的,而磁体502d和502e是矩形的。磁体502a和502c以及502d和502e具有相同的形状和尺寸,但分别的磁化504a和504c和504d和504e相反。磁体502a、502c、502d和502e相对于磁体502b被对称定位。包括磁体502a、502b和502c的一磁体子组件与图3中所示的磁性组件302相同。磁性组件502的中心C(相对于x)是位于磁体502b和磁性组件502两者的对称轴509(相对于y)处。磁性组件502的形状相对于y对称地围绕C。
磁性组件502产生一磁场(未显示)。在C处,磁通量测量装置506是位于远离磁性组件502的DC处。磁性组件502相对于磁通量测量装置506在x方向上沿一行程移动。磁性组件502沿x的位置从x0变化到xmax。x0和xmax可以被选择,使其中间点或对称点xs=xmax/2位于C处,或者或者可以以其他方式选择它们。
在x0至xmax之间,正交距离D是x的函数,D=D(x)。对于500,D(x0)=D(xmax)<DC、D(x0)=D(xmax)=Dmin,且L/Dmin>10。通常,Dmin≥0.1毫米。在x0处,磁极化504a的方向基本上朝向磁通量测量装置506。在xmax处,504c的方向基本上远离磁通量测量装置506。在C处,504b的方向基本上平行于或反向平行于x。504d的方向基本上反向平行于504a。504e的方向基本上反向平行于504c。除了由磁体502a、502b和502c定义的三个磁性组件域之外,在磁性组件502中还有由磁体502d和502e定义的两个附加磁性组件域。
相对于磁性组件202的x位置,B(未显示)是通过磁通量测量装置506来测量。B是x的函数,即B=B(x)。在L中,B的S=(Bmax-B0)/Δx是线性的。表3中给出了示例值。有关包括磁体502a、502b和502c的磁体子组件的数值,请分别参见表1的磁体302a、302b和302c。S的值在DC处被给出。
与磁性组件302相比,磁性组件502的优势在于,对于相同尺寸的磁体502a、502b和502c(其具有与磁体302a、302b和302c相同的尺寸),B与x的曲线具有更高的线性。
表3
图5B显示了本文公开并编号为510的一音圈电机(“VCM”)的一实施例。音圈电机510包括一线圈组件(coil assembly,“CA”)520和位置感测单元500。线圈组件520包括四个线圈520a、520b、520c和520d并且可以产生一磁场。
在音圈电机510中,由位置感测单元500所产生的所述磁场与由线圈组件520所产生的所述磁场一起额外提供了驱动磁性组件502和线圈组件520以及磁通量测量装置506之间的一相对运动所需的磁场配置。通常,对于包括音圈电机510的一装置,磁通量测量装置506和线圈组件520是处于静止状态,而磁性组件502移动。在包括一相机的装置内的镜头聚焦的一些示例中,磁性组件502可以固定地被耦合到所述相机的镜头以相对于相机的图像传感器驱动所述镜头,所述相机的图像传感器相对于所述装置是静止的。与磁性组件302相比,磁性组件502的一个优点是其允许一更快的音圈电机驱动。
在其他实施例中,如音圈电机510的一音圈电机可以包括位置感测单元200、300或400。
虽然本公开内容是通过某些实施例和一般相关联的方法进行描述的,但是本领域技术人员将认识到所述实施例和方法的改动和置换。本公开内容应当被理解成不受限于本文中所描述的具体实施例,而是仅由所附权利要求的范围限制。
除非另有说明,否则在用于选择的选项列表的最后两个成员之间使用表达“和/或”指示对列出的选项中的一个或多个的选择是适当的并且可以进行。
应该理解的是,在权利要求或说明书提及“一个(a)”或“一个(an)”元件的情况下,这种提及不应被解释为仅存在该元件中的一个。
此外,为了清楚起见,术语“基本上”在本文中用于暗指值在可接受范围内变化的可能性。根据一个示例,本文中所使用的术语“基本上”应当被解释为暗指在任何指定值之上或之下可能的变化高达10%。根据另一示例,本文中所使用的术语“基本上”应当被解释为暗指在任何指定值之上或之下可能的变化高达5%。根据另一示例,本文中所使用的术语“基本上”应当被解释为暗指在任何指定值之上或之下可能的变化高达2.5%。
在本说明书中所提及的所有的参考文献皆通过引用而以其整体并入本文中,其范围如同各个单独的参考文献被具体地且单独地指示为通过引用而并入本文中。此外,在本申请中对于任何参考文献的引用或标识皆不应被解释为承认所述参考文献可作为本发明的现有技术。
Claims (31)
1.一种位置感测单元,其特征在于,包括:
a)一磁性组件,所述磁性组件具有沿一第一方向测量的一宽度W和沿一第二方向测量的一高度H,并且所述磁性组件包括至少三个磁体,所述至少三个磁体具有各自的磁极化,所述各自的磁极化沿所述第一方向定义至少一个左磁性组件域、一个中磁性组件域和一个右磁性组件域,其中每个磁性组件域的磁极化是不同的;以及
b)一磁通量测量装置,所述磁通量测量装置用于测量一磁通量B,其中所述磁性组件被配置为在一行程L内沿所述第一方向相对于所述磁通量测量装置移动,所述行程L满足1毫米≤L≤100毫米,所述行程L开始于一第一点x0,结束于一终点xmax,且其中沿一特定磁性组件域和所述位置感测单元的所述磁通量测量装置之间的所述第二方向测量的一正交距离D的一最小值Dmin满足L/Dmin>10,
其中所述至少三个磁体沿所述第一方向被依序地放置,且其中相邻的磁体是通过一间隙被分隔,
其中所述左磁性组件域的磁极化的方向朝向所述磁通量测量装置,所述右磁性组件域的磁极化的方向远离所述磁通量测量装置,所述中磁性组件域的磁极化的方向平行于或反向平行于所述第一方向。
2.根据权利要求1所述的位置感测单元,其特征在于:所述磁性组件具有平行于所述第二方向的一对称轴。
3.根据权利要求1所述的位置感测单元,其特征在于:对于行程L内的不同位置,D不是恒定的。
4.根据权利要求1所述的位置感测单元,其特征在于:L/Dmin>15。
5.根据权利要求1所述的位置感测单元,其特征在于:L/Dmin>20。
6.根据权利要求1所述的位置感测单元,其特征在于:x0处的B为B0,xmax处的B为Bmax,其中一斜率S=(B0-Bmax)/L是大于10毫特斯拉/毫米。
7.根据权利要求1所述的位置感测单元,其特征在于:x0处的B为B0,xmax处的B为Bmax,其中一斜率S=(B0-Bmax)/L是大于100毫特斯拉/毫米。
8.根据权利要求1所述的位置感测单元,其特征在于:x0处的B为B0,xmax处的B为Bmax,其中一斜率S=(B0-Bmax)/L是大于1000毫特斯拉/毫米。
9.根据权利要求1所述的位置感测单元,其特征在于:x0处的B为B0,xmax处的B为Bmax,其中一斜率S=(B0-Bmax)/L是大于2500毫特斯拉/毫米。
10.根据权利要求1至9中任一项所述的位置感测单元,其特征在于,所述位置感测单元被包括在一音圈电机中。
11.根据权利要求1所述的位置感测单元,其特征在于:所述磁通量测量装置是一霍尔传感器。
12.根据权利要求2所述的位置感测单元,其特征在于:所述对称轴是位于所述中磁性组件域的中心。
13.根据权利要求3所述的位置感测单元,其特征在于:所述左磁性组件域和所述磁通量测量装置之间的D值为D(x0),所述右磁性组件域和所述磁通量测量装置之间的D值为D(xmax),所述中磁性组件域和所述磁通量测量装置之间的D值为D(xmax/2),其中D(x0)≤D(xmax/2),且D(xmax)≤D(xmax/2)。
14.根据权利要求3所述的位置感测单元,其特征在于:所述左磁性组件域和所述磁通量测量装置之间的D值为D(x0),所述右磁性组件域和所述磁通量测量装置之间的D值为D(xmax),所述中磁性组件域和所述磁通量测量装置之间的D值为D(xmax/2),其中D(x0)=D(xmax)≤D(xmax/2)。
15.根据权利要求1所述的位置感测单元,其特征在于:所述左磁性组件域、所述中磁性组件域和所述右磁性组件域为矩形。
16.根据权利要求1所述的位置感测单元,其特征在于:所述左磁性组件域和所述右磁性组件域为梯形,所述中磁性组件域为一凸五边形。
17.根据权利要求1所述的位置感测单元,其特征在于:所述左磁性组件域和所述右磁性组件域为梯形,所述中磁性组件域为一凹五边形。
18.根据权利要求10所述的位置感测单元,其特征在于:所述音圈电机包括四个线圈。
19.根据权利要求10所述的位置感测单元,其特征在于:所述音圈电机被包括在智能手机摄像头中。
20.根据权利要求1所述的位置感测单元,其特征在于:所述磁性组件还包括具有各自的磁极化的一第四磁性组件域和一第五磁性组件域,其中所述第四磁性组件域是位于所述左磁性组件域的左侧,所述第五磁性组件域是位于所述右磁性组件域的右侧。
21.根据权利要求20所述的位置感测单元,其特征在于:所述第四磁性组件域的磁极化的方向远离所述磁通量测量装置。
22.根据权利要求20所述的位置感测单元,其特征在于:所述第五磁性组件域的磁极化的方向朝向所述磁通量测量装置。
23.根据权利要求1所述的位置感测单元,其特征在于:L<20毫米。
24.根据权利要求1所述的位置感测单元,其特征在于:L<10毫米。
25.根据权利要求1所述的位置感测单元,其特征在于:L<7.5毫米。
26.根据权利要求1所述的位置感测单元,其特征在于:L<5毫米。
27.根据权利要求1所述的位置感测单元,其特征在于:L/W>0.5。
28.根据权利要求1所述的位置感测单元,其特征在于:L/W>0.75。
29.根据权利要求1所述的位置感测单元,其特征在于:L/H>3。
30.根据权利要求1所述的位置感测单元,其特征在于:L/H>5。
31.根据权利要求1所述的位置感测单元,其特征在于:所述至少三个磁体是由一钕基材料制成。
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KR20240115258A (ko) | 2024-07-25 |
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