Electroacoustic transducer having a diaphragm made of at least one layer of piezoelectric material |
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| 申请号 | US3683129D | 申请日 | 1969-09-25 | 公开(公告)号 | US3683129A | 公开(公告)日 | 1972-08-08 |
| 申请人 | PHILIPS CORP; | 发明人 | ROOS JAN; BOONE SALOMON; | ||||
| 摘要 | An electroacoustic transducer comprising a thin-walled cylindrical sleeve with a vibrating diaphragm that includes at least one layer of piezoelectric material and rigidly secured at its peripheral edge to one end of the sleeve. This allows the diaphragm to perform a pivotal movement at its peripheral edge. In a second embodiment the sleeve is conical with the narrow end flanged inwardly and the diaphragm rigidly secured thereto. If the sleeve is metal, an integrated amplifier may be mounted thereon so that the sleeve acts as a heat sink. | ||||||
| 权利要求 | 1. An electroacoustic transducer comprising a thin-walled housing sleeve, a vibrating diaphragm including at least one layer of piezoelectric material, the wall thickness of the sleeve being less than the thickness of the diaphragm, and means for rigidly securing the outer peripheral edge of the diaphragm directly to the inner surface of one end of said thin-walled sleeve so that the peripheral edge of the diaphragm performs a pivotal movement. 2. An electroacoustic transducer comprising a thin-walled housing sleeve, the sleeve comprising a conical member with the smaller diameter end having its edge flanged inwardly a vibrating diaphragm including at least one layer of a piezoelectric material, means for rigidly securing the peripheral edge of the diaphragm to the flange so that the peripheral edge of the diaphragm performs a pivotal movement. 3. A transducer as claimed in claim 2, characterized in that the outer dimensions of the sleeve at the area of engagement of the flange with the diaphragm are slightly smaller than the outer dimension of the diaphragm. 4. A transducer as claimed in claim 2 wherein the wall thickness of the flange in the axial direction is less than the thickness of the diaphragm in said axial direction. 5. An electroacoustic transducer comprising a thin-walled housing sleeve made of metal, a vibrating diaphragm including at least one layer of a piezoelectric material, means for rigidly securing the peripheral edge of the diaphragm to one end of said thin-walled sleeve so that the peripheral edge of the diaphragm performs a pivotal movement, and an amplifier for the transducer signals mounted on the sleeve in the form of an integrated circuit. 6. An electroacoustic transducer comprising a thin-walled housing sleeve, the sleeve comprising a conical member with the smaller diameter end flanged inwardly from the inner surface of the sleeve, a vibrating diaphragm including at least one layer of a piezoelectric material, means for rigidly securing the peripheral edge of the diaphragm to the flange so as to extend radially beyond the outer surface of the sleeve at said smaller end whereby the peripheral edge of the diaphragm performs a pivotal movement. 7. A transducer as claimed in claim 6 wherein the peripheral edge of the diaphragm is rigidly secured to the flange by engagement of one surface only of the diaphragm. |
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