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1. 发明专利

JPH06165295A PIEZOELECTRIC DIAPHRAGM 失效
公开(公告)号：JPH06165295A
公开(公告)日：1994-06-10
申请号：JP30876492
申请日：1992-11-18
申请人： MURATA MANUFACTURING CO
发明人： SAKAMOTO HIDEKI , SAITO SHUHO , YAMASHITA TOSHIAKI , KIDA MASATAKA
IPC分类号： G10K9/122 , G10K9/12 , G10K9/18 , H04R17/00
摘要： PURPOSE:To provide the piezoelectric vibrator in which a support plate is formed even with the use of an insulation raw material so long as the vibration condition is satisfied and the degree of freedom of selection of an adhesives is extended. CONSTITUTION:A piezoelectric diaphragm 1 is provided with a piezoelectric ceramic plate 2 with an electrode layer formed on respective surface and a support plate 3 with a throughhole 3a formed along the thickness direction and adhered by confronting to one surface side of the piezoelectric ceramic plate 2 and an external lead terminal 5 is respectively connected to one surface side electrode layer of the piezoelectric ceramic late 2 exposed by the throughhole 3a and other side electrode layer exposed on the entire surface.

2. 发明专利

JPH0678396A PIEZOELECTRIC SOUNDER ARRAY AND ITS MANUFACTURE 失效
公开(公告)号：JPH0678396A
公开(公告)日：1994-03-18
申请号：JP22563292
申请日：1992-08-25
申请人： MURATA MANUFACTURING CO
发明人： SAKAMOTO HIDEKI , SAITO SHUHO , KIDA MASATAKA
IPC分类号： H04R17/00
摘要： PURPOSE:To make the acoustic characteristic stable by providing a piezoelectric element with a resin case surrounding a diaphragm forming region and linked to both sides of a metallic plate hoop through a throughhole so as to eliminate occurrence of deformation due to a stress. CONSTITUTION:A molding throughhole group 6 is formed by punching along an outer ridge of each diaphragm forming region 5 of a metallic plate hoop 2 and a nock-out throughhole group 7 is formed with punch concentrically to an outside of the hole group 6. After the holes are made, the hoop 2 is set in a metallic die, insert molding is implemented and a resin case 3 is formed. Then piezoelectric elements 4 made of a ceramics are adhered onto a region 5 of the hoop 2 with the case 3 fitted thereto. The adhesion is executed by using a conductive adhesives to connect the elements 4 and a diaphragm A electrically and mechanically. Since the region 5 is reinforced by the case 3 arranged around the same and the hoop 2 is formed in a shape of a long plate, no deformation is caused at the time of adhesion.

3. 发明专利

JPH06148243A METHOD OF MEASURING IMPEDANCE OF PIEZOELECTRIC VIBRATING PLATE 失效
公开(公告)号：JPH06148243A
公开(公告)日：1994-05-27
申请号：JP29979292
申请日：1992-11-10
申请人： MURATA MANUFACTURING CO
发明人： MATSUMURA MITSUNORI , SAITO SHUHO , SAKAMOTO HIDEKI , YAMASHITA TOSHIAKI , KIDA MASATAKA
IPC分类号： G01N27/02 , G01R27/02
摘要： PURPOSE:To provide a measuring method of the impedance of a piezoelectric vibrating plate which enables correct and moreover, automatic measurement of the impedance characteristic without correctly positioning a vibrating node of the piezoelectric vibrating plate. CONSTITUTION:A flat piezoelectric vibrating plate 1 is formed of a piezoelectric ceramic plate 2 having electrodes formed at front and rear faces thereof, and a metallic plate 3 bonded facing to the rear electrode of the ceramic plate 2. After the piezoelectric vibrating plate 1 is set along a direction of the plane, the characteristic of the impedance of the piezoelectric vibrating plate 1 is measured under the spreading vibration mode.

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