公开(公告)号：US06366182B1

公开(公告)日：2002-04-02

申请号：US09317661

申请日：1999-05-24

申请人： Hideo Mura ,  Takashi Shimura

发明人： Hideo Mura ,  Takashi Shimura

IPC分类号： H03H9205

CPC分类号： H03H9/581 ,  H03H9/1028 ,  H03H9/605

摘要： A ladder-type piezoelectric filter includes two parallel resonators to vibrate in a square type vibration mode, each of which has a substantially square shape, and two series resonators adapted to vibrate in a square type vibration mode, each of which has a substantially square shape and has a corner cut portion located at each of four corners. The parallel and series resonators have substantially equal distances between respective opposite side edges thereof and are made from materials having the same frequency constant. The parallel and series resonators are housed within a housing and are aligned at approximate centers thereof.

摘要翻译： 梯型压电滤波器包括两个并联谐振器，其以方形振动模式振动，每个振荡模式具有大致正方形的形状，以及两个串联谐振器，其适于以方形振动模式振动，每个谐振器具有大致正方形的形状 并且具有位于四个角中的每一个处的角部切割部。 平行和串联谐振器在其相应的相对侧边缘之间具有基本相等的距离，并且由具有相同频率常数的材料制成。 并联和串联谐振器容纳在壳体内并在其近似中心处对准。

公开(公告)号：US5982254A

公开(公告)日：1999-11-09

申请号：US79348

申请日：1998-05-15

申请人： Takashi Shimura

发明人： Takashi Shimura

IPC分类号： H03H9/10 ,  H03H9/58 ,  H03H9/60

CPC分类号： H03H9/1028 ,  H03H9/605

摘要： A highly reliable ladder filter has a simple structure and is adapted to be readily assembled automatically for less cost. The ladder filter includes a case including storage sections which are adjacent to each other. A first series piezoelectric resonator, a second series piezoelectric resonator and a second parallel piezoelectric resonator are stored in one storage section such that the second series piezoelectric resonator is located between the first series resonator and the parallel resonator. A first parallel piezoelectric resonator, a third parallel piezoelectric resonator and a third series piezoelectric resonator are stored in the other storage section such that the third parallel piezoelectric resonator is located between the first parallel resonator and the third series resonator. The first series piezoelectric resonator is disposed adjacent to the first parallel piezoelectric resonator such that the partition wall is located therebetween.

摘要翻译： 高度可靠的梯形过滤器具有简单的结构，适合于以较低成本自动组装。 梯形滤波器包括彼此相邻的存储部的壳体。 第一串联压电谐振器，第二串联压电谐振器和第二并联压电谐振器被存储在一个存储部分中，使得第二串联压电谐振器位于第一串联谐振器和并联谐振器之间。 第一并联压电谐振器，第三并联压电谐振器和第三串联压电谐振器被存储在另一存储部分中，使得第三并联压电谐振器位于第一并联谐振器和第三串联谐振器之间。 第一串联压电谐振器设置成与第一并联压电谐振器相邻，使得分隔壁位于它们之间。