发明授权
- 专利标题： Ladder-type electric filter device
- 专利标题（中）： 梯型电动过滤装置
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申请号： US865866申请日： 1992-04-09
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公开(公告)号： US5260675A公开(公告)日： 1993-11-09
- 发明人: Tatsuo Ogawa , Isao Shimizu
- 申请人： Tatsuo Ogawa , Isao Shimizu
- 申请人地址： JPX JPX
- 专利权人： NGK Spark Plug Co., Ltd.,Nippon Telegraph and Telephone Corporation
- 当前专利权人： NGK Spark Plug Co., Ltd.,Nippon Telegraph and Telephone Corporation
- 当前专利权人地址： JPX JPX
- 优先权： JPX3-033539 19910412; JPX3-033540 19910412
- 主分类号： H03H9/10
- IPC分类号： H03H9/10 ; H03H9/58 ; H03H9/60 ; H03H9/00
摘要：
A ladder-type electric filter device in which a casing is partitioned into two compartments, one for containing strip-shaped series piezoelectric resonator elements which are operated at a longitudinal oscillation mode and the other for containing square shaped parallel piezoelectric resonator elements which are operated at a peripheral oscillation mode, each of the series and parallel resonator elements is layered along the height of the casing. Alternatively, an input, output and grounding terminal plates for electrically connecting rectangular piezoelectric resonator elements operated at a longitudinal oscillation mode are integrally formed with a casing for containing the rectangular piezoelectric resonator elements.
公开/授权文献
- USD254916S Telephone index or the like 公开/授权日：1980-05-06
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