CN1218610C - 电机传感器 - Google Patents
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Abstract
本发明涉及一种电机传感器,它可简单而廉价地生产,它包含:堆叠式设置的压电元件(1,3,5,7,9,11),设置在压电元件之间的接触电极(G,S,E),压电元件(1,3,5,7,9,11)通过它们进行电气连接,其中接触电极(G,S,E)是由一个有弹性的线路板(13,13a,13b,13c)引出的平面连接片(33,35,37,39,41,43,45,47,55,57,59,61,63,65,67,69,77,79,81,83,85,87,89,91)。
Description
本发明涉及一种电机传感器,具有堆叠式设置的压电元件,在压电元件之间设置有接触电极,压电元件通过这些电极进行电气连接。
这种电机传感器被用在例如测量技术和控制技术中。例如市场上用于确定和/或监测容器中预定的填充位置的装置,它具有安装在预定的填充位置高度上的一个机械的振荡装置,它由电机传感器激励而振动。DE-A4118793中描述了这种装置的一个例子。机械振荡装置的振动被记录并转换成电信号,对电信号进行进一步的处理和/或评估。由此电信号可确定例如振动的频率和/或振幅。由频率和/或振幅给出结论:机械振荡装置是否被填充物所覆盖。
这种填充位置门限开关被应用在许多工业部门中,尤其是在化学和生活用品工业中。它们被用于门限位置检测,并被用作例如过满保护或泵空转保护。
具有堆叠式设置的压电元件的电机传感器具有以下优点:多个压电元件可以在电气上并联,而在机械上串联连接。从而可得到一个很耐用的功率强大的传感器。
在常规的电机传感器中压电元件通常人工地被堆叠,并在两个相邻元件之间分别插入平面电极并例如借助于一种胶来固定。这些电极具有从堆叠结构向外引出的接触片,通过接触片来连接压电元件。
生产这种堆叠结构是很费事的。尤其在通常需要大件数的情况下,它的成本很高。
本发明的目的在于提供一种电机传感器,它可简单而廉价地生产。
为上述目的,本发明所述的一种电机传感器包含:
—堆叠式设置的压电元件,
—设置在压电元件之间的接触电极,压电元件通过这些接触电极进行电气连接,
—其中接触电极是由有弹性的线路板引出的平面连接片。
按照本发明的第一种实施方式,有弹性的线路板具有分级形式构成的区域,在每一级上引出一个平面连接片,并且这些级具有的高度与嵌在相应级之中的压电元件的厚度相同。
按照本发明的第二种实施方式,堆叠结构由至少两个相互呈上下排列的子堆(Teilstapel)组成,并且每个子堆的压电元件借助于围绕着一个该子堆所属的弹性线路板基面排列的、由线路板引出的连接片进行连接。
按照本发明的第三种实施方式,弹性线路板具有一个区域,其中多根导体条相叠地走线,并且每根导体条结束于一个垂直于导体条走向的连接片上,其中各个连接片相互平行地设置,并用于连接与它们邻接的压电元件。
按照上述任意一种实施方式,在弹性线路板上设置电子元件,特别是SMD元件。
此外本发明还提供了生产上述电机传感器的一种方法,其中弹性线路板被装配有元件,通过弹性线路板的成形,连接片相互平行并相叠地设置,这样压电元件相互上下地被堆叠,并且此堆叠结构被挤压。
按照本发明所述方法的一种实施方式,元件为压电元件和SMD元件,并且自动进行装配。
此外,本发明还提供了一种用于确定和/或监测容器中预定的填充位置的装置,此装置包括:
—安装在预定的填充位置高度上的机械的振荡装置,
—本发明所述的电机传感器,
—该传感器在工作中用于激励机械振荡装置使其振动,记录与当前填充位置有关的振荡装置振动,并进行进一步的处理和/或评估。
本发明的优点在于连接片是弹性线路板的组成部分。即它们并非是单个零散的、会引起附加成本的元件,而是本来就有的线路板的特别设计的部分。
弹性线路板的连接片特别适合于机器加工。例如所有接线片可以同时用机器涂胶,并接着用机器与压电元件一起装配。此外,在装配过程中还可在一个工序中安装弹性线路板上的电子元件。因而本发明电机传感器的生产是很迅速的,准全自动的,因而也是很廉价的。
下面借助于附图详细说明本发明及其它优点,附图表表示三种实施例;在附图中用相同标记表示同一个元件。
图1表示一种本发明所述的电机传感器;
图2表示具有分级形式设置的连接片的弹性线路板的前视图;
图3表示具有环形围绕着基面排列的连接片的弹性线路板的前视图;
图4表示具有一个区域的弹性线路板,在此区域中多根导体条相叠地走线,并且每根导体条终止于一个垂直于导体条走向的连接片上;
图5表示图4所示线路板的截面图;
图6表示具有本发明所述电机传感器的、用于确定和/或监测容器中的预定填充位置的装置的截面图;以及
图7表示图6所示装置的截面图,其中截面平面相对于图6所示截面的平面旋转90°。
图1表示按照本发明构造的一种电机传感器。它包括堆叠式设置的压电元件1,3,5,7,9,11。在压电元件1,3,5,7,9,11之间,在排在最上面的压电元件1的上方以及排在最下面的压电元件11的下方分别设置一个接触电极S,E或G。压电元件1,3,5,7,9,11通过接触电极S,E,G电气连接到在弹性线路板13中走向的导体线上,在所示实施例中,这些导体线为一根发送信号线LS,一根接收信号线LE和一根地线LG。在所选实施例中,接触电极S连接于发送信号线LS,接触电极E连接于接收信号线LE,而接触电极G连接于地线LG。
压电元件的顺序及其与连接线的电气连接方式是任意的,并且根据传感器以后的应用来选择。
在实施例中所选择的压电元件1,3,5,7,9,11的排列及其电气连接适用于例如前面所述的、用于确定和/或监测一个预定的填充位置的装置。
上面的4个压电元件1,3,5,7电气上并联,而机械上串联连接。为此最上面的压电元件1上方的接触电极G连接于地线LG,在最上面的压电元件1和与其相邻的压电元件3之间的接触电极S连接于发送信号线LS,后面紧接着的位于压电元件3和压电元件5之间的接触电极G连接于地线LG,压电元件5和压电元件7之间的接触电极S连接于发送信号线LS,并且压电元件7下面的接触电极G连接于地线LG。压电元件1,3,5和7都具有与堆叠结构的纵轴平行的极化。然而相邻的压电元件1-3,3-5,5-7是极性相反的。在图1中这通过标记+和-表示。
一个通过发送信号线LS引入的交流电压导致压电元件1,3,5,7的一个同步的、相同方向上的厚度振荡。由压电元件1,3,5,7构成的子堆用作例如一个用于激励与引入的交流电压有关的振动的发送器。
在压电元件7下面设置一个由绝缘体,例如由陶瓷,构成的隔离垫片15。隔离垫片15的作用是在电气上和机械上将上面的压电元件1,3,5,7与设置在隔离垫片15下面的压电元件9,11隔离开。
在所示实施例中,由压电元件9,11构成的子堆被设计为接收器。其中压电元件9,11电气上并联,而机械上串联连接。为此压电元件9上面的接触电极G和压电元件11下面的接触电极G与地线LG相连接。设置在压电元件9和11之间的接触电极E与接收信号线LE相连接。
如果机械振荡装置已由发送器激励而振动,堆叠结构和振荡装置的振动如此被输出:它通过接收器以通过接收信号线LE可得到的、与所产生的振动有关地变化的电压的形式可进行进一步的处理和/或评估。
弹性线路板例如由Schoeller Elektronik公司以商用名称Polyflex销售。线路板例如由薄铜板构成,它由Schoeller Elektronik公司按照所希望的导体条结构在浸蚀工艺中进行处理,并且在其上相继在两个侧面分别覆盖一层厚的聚酰亚胺覆盖膜。
按照本发明,使用有弹性的线路板13,其中接触电极S,E,G是由弹性线路板13引出的平面连接片。平面连接片是弹性线路板13的集成元件。它们例如由相应形状的铜板段构成,这些段没有设置覆盖膜。
图2表示按照本发明构造的弹性线路板13a的第一种实施例。它具有一个分级形式构成的区域17。在所示实施例中,它包括7级:19,21,23,25,27,29,31。在每级19,21,23,25,27,29,31上引出一个平面的连接片33,35,37,39,41,43,45。连接在区域17边缘的级31是很低的。在这一级31上不仅在级31的上侧引出连接片45,而且还在级31的下侧引出另一个连接片47。连接片33,35,37,39,41,43,45,47分别具有一个窄的连接桥和一个位于与这些级台阶相对的一端的圆盘形电极面。
连接片33,35,37,39,41,43,45所具有的高度与和各个连接片33,35,37,39,41,43,45邻接的压电元件1,3,5,7,9,11的厚度相同。
在生产本发明所述的电机传感器中,首先弹性线路板13a被装配元件。这里元件是指压电元件1,3,5,7,9,11、隔离垫片15以及在给定情况下其它在线路板13a上所需的电子元件。优选地,在图2中仅以图例表示的电子元件为可表面安装的元件,即SMD元件49,这使得线路板13a的装配可全自动地进行。SMD元件49设置在位于分级形式的区域17旁边的区域51上。
在安装压电元件1,3,5,7,9,11时,在连接片33,35,37,39,41,43,45,47上涂覆一种胶,例如导电胶或SMD胶,并且压电元件1安装在连接片33上,压电元件3安装在连接片35上,压电元件5安装在连接片37上,压电元件7安装在连接片39上,隔离垫片15安装在连接片41上,压电元件9安装在连接片43上,并且压电元件11安装在连接片45上。
然后连接片33,35,37,39,41,43,45,47通过弹性线路板13a的成形相互平行并相叠地排列。在图2所示实施例中这是如此实现的:所有连接片33,35,37,39,41,43,45,47被竖立起来,直至垂直于线路板13a的区域17,并且区域17从最下面的级31一侧开始被卷起来。这样压电元件1,3,5,7,9,11在中间添加隔离垫片15的情况下相互上下地被堆叠起来。如此预成形的堆叠结构接着被挤压,以保证连接片33,35,37,39,41,43,45,47与压电元件1,3,5,7,9,11之间可靠的电气连接。
与图1所示的电机传感器13一致,连接片33,37,41,43和47构成接触电极G,它连接于一个在线路板13a中走线的、图2中未表示的地线LG。连接片35,39构成接触电极S,它连接于一个在线路板13a中走线的、图2中未表示的发送信号线LS。连接片45构成接触电极E,它连接于一个线路板13a中走线的、图2中未表示的接收信号线LE。
线路板13a具有一个窄的、垂直于区域17和51伸展的突起部52,在其终端设置有一个插座53。在突起部52中线路板13a的所有导线继续引向前端,它们被连接到线路板13a外的一个接头上。在所选实施例中,这些导线为发送信号线LS,接收信号线LE和地线LG。
图3表示弹性线路板13b的另一实施例。线路板13b与图2所示线路板13a的区别仅在于线路板13a或13b上连接片的排列和SMD元件49的位置。
在图3所示实施例中设置了连接片55,57,59,61,63,65,67,69,它们以环状排列在基面71,73周围。
在此实施例中堆叠结构也如图1所示来构造,并且由至少两个相互上下排列的子堆组成。相应地,连接片55,57,59,61围绕基面71排列,连接片63,65,67,69围绕基面73排列。
每个子堆1-3-5-7或9-11的压电元件1,3,5,7,9,11借助于围绕该子堆所属的弹性线路板13b的基面71,73排列的、由线路板13b引出的连接片55,57,59,61,63,65,67,69被连接。
在安装压电元件1,3,5,7,9,11时,在连接片55,57,59,61,63,65,67,69上涂覆一种胶,例如导电胶或SMD胶,并且压电元件1安装在连接片55上,压电元件3安装在连接片57上,压电元件5安装在连接片59上,压电元件7安装在连接片61上,隔离垫片15安装在连接片63上,压电元件9安装在连接片65上,并且压电元件11安装在连接片67上。
然后连接片55,57,59,61,63,65,67,69通过弹性线路板13b的成形相互平行并相叠地排列。在图3所示实施例中这是如此实现的:将连接片69向上弯起,直至它垂直于线路板13b。接着连接片67被折弯,使得其上安装的压电元件11平放在连接片69上。相应地对后续的连接片65,63,61,59,57,55这样处理。最后,设置在连接片65上的压电元件9位于连接片67避开压电元件11的表面上,设置在连接片63上的隔离垫片15位于连接片65避开压电元件9的表面上,设置在连接片61上的压电元件7位于连接片63避开隔离垫片15的表面上,设置在连接片59上的压电元件5位于连接片61避开压电元件7的表面上,设置在连接片57上的压电元件3位于连接片59避开压电元件5的表面上,并且设置在连接片55上的压电元件1位于连接片57避开压电元件3的表面上。
同样这里弹性线路板13b也被装配元件,连接片55,57,59,61,63,65,67,69通过弹性线路板13b的成形相互平行并相叠地排列,从而压电单元1,3,5,7,9,11相互上下地被堆叠,最后堆叠结构被挤压。
基面71,33在此状态下作为相切平面设置在两个子堆旁。在这两个基面71,73上设置SMD元件49。当然这些元件或其它的电子元件也可以设置在线路板13b的其它地方。
与图1所示的电机传感器13一致,这里连接片55,59,63,65,69构成接触电极G,它连接于一根在线路板13b中走线的、图3中未表示的地线LG。连接片57,61构成接触电极S,它连接于一根在线路板13b中走线的、图3中未表示的发送信号线LS。连接片67构成接触电极E,它连接于一根在线路板13b中走线的、图3中未表示的接收信号线LE。
图4和图5表示弹性线路板13c的另一实施例。下面仅详细说明它于前面所述实施例的不同之处。
弹性线路板13c具有一个区域75,在该区域中多根导体条相叠地走线。每根导体条结束于一个垂直于导体条走向的连接片77,79,81,83,85,87,89,91。各个连接片77,79,81,83,85,87,89,91相互平行地排列,并且用于连接与它们邻接的压电元件1,3,5,7,9。
在生产时,连接片77,79,81,83,85,87,89,91被涂胶,并且在连接片77,79,81,83,85,87,89,91之间的中间空间中安装压电元件1,3,5,7,9,11和隔离垫片15。这里压电元件1安装在连接片77和79之间,压电元件3安装在连接片79和81之间,压电元件5安装在连接片81和83之间,压电元件7安装在连接片83和85之间,隔离垫片15安装在连接片85和87之间,压电元件9安装在连接片87和89之间,并且压电元件11安装在连接片89和91之间。
在此实施例中不需要弹性线路板13c的特殊成形,因为连接片77,79,81,83,85,87,89,91已基本上具有其最终适宜的位置,即在所示形状中它们已处于垂直于线路板平面的位置。这里在装配之后也需要挤压堆叠结构,以形成与连接片77,79,81,83,85,87,89,91的持久的电气和机械连接。
连接片77,79,81,83,85,87,89,91与发送信号线LS、接收信号线LE和地线LG的电气连接以类似于前两个实施的方式完成,因而这里不需要说明。
完全与前面所述实施例一样,弹性线路板13c具有一个纵向突起部52,在其终端有一个插座53,在线路板13c中走向的导体条通过它可连接到外面。与突起部52呈直角设置有线路板13c的另一区域93,在该区域上可设置电子元件。如图5中以图例表示的那样,它们最好是SMD元件49,它们可以与电压元件1,3,5,7,9,11和隔离垫片15一起在一个自动装配过程中被安装。
图6和7表示用于确定和/或监测在容器中的预定的填充位置的装置的两个相互旋转90°的截面,该装置具有本发明所述的电机传感器。
该装置具有一个基本上呈圆柱形的外壳95,它在端部被一圆盘形的薄膜97在前端紧密封闭。在外壳95的外侧,在薄膜97上形成两个伸入容器中的振荡棒99。外壳95、薄膜97和振荡棒99是机械振荡装置的组成部分,此振荡装置通过设置在外壳95内部的电机传感器101而被激励起振。这里薄膜97进行折弯式振动,而振荡棒99在垂直于其纵轴的方向上振动。然而也可使用仅有一个或没有振荡棒的振荡装置。在没有振荡棒的情况下,例如仅有振动薄膜与位于容器中的填充物接触。
该装置被安装在预定填充位置的高度上。为此在外壳95上设置有一个外螺纹,借助于它,装置可在容器中的一个相应开口内旋紧。同样可采用其它的安装方式,例如借助于法兰盘。
装置具有本发明所述的电机传感器101,它在前面已借助图1至5所示实施例说明。其作用是在工作中激励机械振荡装置使其振动,并且记录振荡装置与当前填充位置有关的振动,并可进行进一步处理和/或评估。
传感器101安装在与堆叠结构在终端一侧分别邻接的第一和第二活塞103之间。活塞103最好由一种很硬的材料例如一种金属构成。
传感器101沿着外壳95的纵轴方向在外壳95中旋紧的加压螺纹105与薄膜97之间被绷紧。这样薄膜97被旋加预应力。
发送器用于在工作中激励机械振荡装置产生机械振荡,为此工作中在发送器上施加电发送信号,通过此信号,发送器以及传感器101被激励产生厚度振荡。
相应地,振荡棒99的振动使得薄膜97产生折弯振动,它反过来又影响传感器101的厚度振动。此厚度振动导致通过接收器得到的电压的变化。一个相应的接收信号通过接收信号线LE被提供。
机械振荡装置的机械振荡振幅愈大,接收信号的振幅愈大。利用此事实,装置优选地工作在其谐振频率fr上。在谐振频率fr上机械振荡的振幅最大。
为了使机械振荡装置在其谐振频率fr上受激起振荡,可以例如设置一个调节电路,它将发送信号和接收信号之间出现的相位差调整到一个确定的恒定值上,例如通过使接收信号经过一个移相器和一个放大器后被反馈到发送信号中。例如在DE-A4419617中描述了这种调节电路。
自动调节的谐振频率fr及其振幅取决于机械振荡装置是否被容器中的填充物所覆盖。相应地,可取出一个或两个测量值,用以确定和/或监测预定的填充位置。
例如接收信号可被送到评估单元,评估单元借助于频率测量电路确定其频率,并将结果送至比较器。比较器将测得的频率与存贮在存贮器中的参考频率fR进行比较。如果测得的频率低于参考频率fR,则评估单元给出一个输出信号,它表示机械振荡装置被填充物覆盖。如果频率值大于参考频率fR,则评估单元给出一个输出信号,它表示机械振荡装置尚未被填充物覆盖。
此输出信号例如是一个电压,它代表一个相应的值,或者输出信号是一个电流,它具有一个相应的值,或者为其上叠加有一个以具有相应频率或相应持续宽度的脉冲为形式的信号电流。
压电元件1,3,5,7,9,11被放入一个套简中,弹性线路板13从其侧面引出。活塞103嵌入套简的端侧。线路板在安装状态下围绕着堆叠结构被卷起来,并设置在外壳95中的一个衬套106中。衬套106基本呈现罐形并具有一个底,在底中央处有一个穿孔107。穿孔107的形状适配于活塞103,薄膜97最好具有一个形状适配于第一个活塞103的槽,活塞103的圆顶可旋转地置于此槽中。这种形式的安装提供了以下优点:由于圆顶和槽的圆形形状,可实现无大的磨擦损耗并且没有其它方式所避免不了的作用在堆叠结构上的扭力,并且同时由于槽中圆顶的大的安装面,保证了从堆叠结构到薄膜97上的机械力传递非常良好。
衬套106具有一个在背向薄膜方向上向前引伸的窄壁区域,它用作对弹性线路板13引向插头53的区域52的保护依托。
加压螺纹105借助于一个卡锁与衬套106相连接。为此衬套106具有两个彼此相对设置的、位于背向薄膜一端上的缺口,相应成形的、在加压螺纹105指向薄膜的一端上的制动鼻被插入此缺口中。卡锁提供了以下优点:衬套106和加压螺纹105以非常简单的方式牢固地相互连接。
加压螺纹105具有一个侧面开口的缺口,与插头53相连的弹性线路板13的区域52穿过此缺口。
在插座上安放一个接插连接器109,通过它可连接电机传感器。
Claims (8)
1.电机传感器,它包括:
—堆叠式设置的压电元件(1,3,5,7,9,11),
—设置在压电元件之间的接触电极(G,S,E),压电元件(1,3,5,7,9,11)通过接触电极进行电气连接,
—其中接触电极(G,S,E)是由弹性线路板(13,13a,13b,13c)引出的平面连接片(33,35,37,39,41,43,45,47,55,57,59,61,63,65,67,69,77,79,81,83,85,87,89,91)。
2.如权利要求1所述的电机传感器,其特征在于,
—弹性线路板(13a)具有一个分级形式构成的区域(17),
—在每一级(19,21,23,25,27,29,31)上引出一个平面连接片(33,35,37,39,41,43,45,47,49),并且
—级(19,21,23,25,27,29,31)所具有的高度和与相应的级(19,21,23,25,27,29,31)邻接的压电元件(1,3,5,7,9,11)的厚度相同。
3.如权利要求1所述的电机传感器,其特征在于,
—堆叠结构由至少两个相互上下排列的子堆组成,并且
—每个子堆的压电元件(1,3,5,7,9,11)借助于围绕着一个该子堆所属的弹性线路板(13b)的基面(71,73)排列的、由线路板(13b)引出的连接片(55,57,59,61,63,65,67,69)被连接。
4.如权利要求1所述的电机传感器,其特征在于,弹性线路板(13c)具有一个区域(75),多根导体条在该区域中相叠地走线,并且每根导体条终止于一个垂直于导体条走向的连接片(77,79,81,83,85,87,89,91),其中各个连接片(77,79,81,83,85,87,89,91)相互平行地设置,并用于连接与它们邻接的压电元件(1,3,5,7,9,11)。
5.如以上权利要求中任一项所述的电机传感器,其特征在于,在弹性线路板(13,13a,13b,13c)上安装电子元件。
6.用于生产如以上权利要求中任一项所述的电机传感器的方法,其特征在于,
—弹性线路板(13,13a,13b,13c)被装配元件,
—连接片(33,35,37,39,41,43,45,47,55,57,59,61,63,65,67,69,77,79,81,83,85,87,89,91)通过弹性线路板(13,13a,13b,13c)的成形相互平行并相叠地设置,从而压电元件(1,3,5,7,9,11)相互呈上下地被堆叠,并且
—堆叠结构被挤压。
7.如权利要求6所述的方法,其特征在于,元件为压电元件(1,3,5,7,9,11)和SMD元件(49),并且装配自动进行。
8.用于确定和/或监测容器中的预定的填充位置的装置,其特征在于,该装置包含:
—安装在预定填充位置高度上的机械振荡装置,以及
—如权利要求1至5中任一项所述的电机传感器(101),
—它在工作中用于激励机械振荡装置使其产生振动,并记录与当前填充位置有关的机械振荡装置的振动,并可进行进一步的处理和/或评估。
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-
2000
- 2000-06-07 DE DE10028319A patent/DE10028319A1/de not_active Withdrawn
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2001
- 2001-05-16 AU AU2001265968A patent/AU2001265968A1/en not_active Abandoned
- 2001-05-16 WO PCT/EP2001/005542 patent/WO2001095667A1/de active IP Right Grant
- 2001-05-16 EA EA200201295A patent/EA004668B1/ru not_active IP Right Cessation
- 2001-05-16 EP EP01943375A patent/EP1287720B1/de not_active Expired - Lifetime
- 2001-05-16 US US10/296,248 patent/US6946779B2/en not_active Expired - Fee Related
- 2001-05-16 JP JP2002501839A patent/JP3602523B2/ja not_active Expired - Fee Related
- 2001-05-16 CN CN01810780XA patent/CN1218610C/zh not_active Expired - Fee Related
- 2001-05-16 HU HU0301309A patent/HU223886B1/hu not_active IP Right Cessation
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- 2001-05-16 AT AT01943375T patent/ATE270488T1/de not_active IP Right Cessation
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CA2421318A1 (en) | 2003-02-04 |
DE50102749D1 (de) | 2004-08-05 |
HU223886B1 (hu) | 2005-03-29 |
CN1433662A (zh) | 2003-07-30 |
WO2001095667A1 (de) | 2001-12-13 |
US6946779B2 (en) | 2005-09-20 |
EP1287720B1 (de) | 2004-06-30 |
JP2003536294A (ja) | 2003-12-02 |
EA004668B1 (ru) | 2004-06-24 |
EA200201295A1 (ru) | 2003-06-26 |
AU2001265968A1 (en) | 2001-12-17 |
JP3602523B2 (ja) | 2004-12-15 |
US20030168945A1 (en) | 2003-09-11 |
CA2421318C (en) | 2007-05-08 |
HUP0301309A2 (en) | 2003-08-28 |
DE10028319A1 (de) | 2001-12-13 |
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