Title: An underwater playback device
Application Number: 200310121395 Application Date: 2003.12.16
Publication Number: 1630429 Publication Date: 2005.06.22
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04R1/44,H04R27/00
Applicant(s) Name: Institute of Acoustics, Chinese Academy of Science Address: 100080
Inventor(s) Name: Wan Shimin, Hu Changqing
Attorney & Agent: wang fenghua
Abstract:
     This invention refers to a playback apparatus used under water, which contains protective cover, under water louderspeaker and matched power amplifier wherein said under water louderspeaker and matched power amplifier are fixed in protective cover for use under water, said under louderspeaker containing thin metal piece fixed on front end of protective cover by a rubber ring, a piezoelectric ceramic piece adhered on back of metal piece and covered by rubber layer which also is adhered on front end of metal piece, the cavity behind piezoelectric ceramic piece is holed, said power amplifier is fixed and sealed at rear end of protective cover with power of 1 to 60 W, its input end connected with cable and output lead wire connected with electrode of piezoelectric ceramic piece through the cavity. Said invention integrates under water louderspeaker and matched power amplifier and improves the sound quality.
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