Piezoelectric speaker
Patent 4969197 Issued on November 6, 1990. Estimated Expiration Date: 
February 21, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 21, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2912605 Piezoelectric electro-acoustic transducer Piezoelectric loudspeaker Piezoelectric transducer Film speaker using a piezo-electric element Patent #: 4820952 InventorAssigneeApplicationNo. 312999 filed on 02/21/1989US Classes:381/190, Electrostrictive, magnetostrictive, or piezoelectric310/324, Diaphragm310/345, Supported by elastic material381/182, Plural or compound reproducers381/186, Plural diaphragms381/428FibrousExaminersPrimary: Ng, Jin F.Assistant: Byrd, Danita R. Foreign Patent References
International ClassesH04R 017/00H04R 007/04 H01L 041/09 H01L 041/18 Foreign Application Priority Data1988-06-10 JPAbstractA piezoelectric speaker in which a diaphragm containing a piezoelectric driver is fixed on a frame through an elastic supporting member. The diaphragm is an assembly of two resin foam plates facing each other. Each resin foam plate has a recess and a projecting member at the substantial center of the recess bottom. The piezoelectric driver is accommodated in the space made of the two recesses while being interposed and supported by the projecting members at the substantial center thereof. | |
