EP0883326A3 - Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer - Google Patents

Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer Download PDF

Info

Publication number
EP0883326A3
EP0883326A3 EP98401302A EP98401302A EP0883326A3 EP 0883326 A3 EP0883326 A3 EP 0883326A3 EP 98401302 A EP98401302 A EP 98401302A EP 98401302 A EP98401302 A EP 98401302A EP 0883326 A3 EP0883326 A3 EP 0883326A3
Authority
EP
European Patent Office
Prior art keywords
transformer
piezoelectric speaker
magnetic core
secondary winding
turns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98401302A
Other languages
German (de)
French (fr)
Other versions
EP0883326A2 (en
Inventor
Takeshi c/o Murata Manufact.Co. Ltd Nakamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP0883326A2 publication Critical patent/EP0883326A2/en
Publication of EP0883326A3 publication Critical patent/EP0883326A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

The transformer (10) for a piezoelectric speaker includes an E-shaped magnetic core (11). An inner secondary winding (12a) having a number of turns corresponding to approximately one-half of the number of turns of a secondary winding (12) is wound around a shaft portion of the magnetic core (11). A primary winding (13) is wound around the shaft portion of the magnetic core (11) over the inner secondary winding (12a). Further, an outer secondary winding (12b) having a number of turns corresponding to the another half of the number of turns of the secondary winding (12) is wound around the shaft portion of the magnetic core (11) over the primary winding (13). An I-shaped core (16) is provided at the open side of the E-shaped magnetic core (11).
EP98401302A 1997-06-03 1998-05-29 Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer Withdrawn EP0883326A3 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP14528097 1997-06-03
JP145280/97 1997-06-03
JP14528097 1997-06-03
JP08133498A JP3309798B2 (en) 1997-06-03 1998-03-27 Transformer for piezoelectric speaker
JP81334/98 1998-03-27
JP8133498 1998-03-27

Publications (2)

Publication Number Publication Date
EP0883326A2 EP0883326A2 (en) 1998-12-09
EP0883326A3 true EP0883326A3 (en) 2005-07-13

Family

ID=26422355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98401302A Withdrawn EP0883326A3 (en) 1997-06-03 1998-05-29 Transformer for piezoelectric speaker and piezoelectric speaker operative with said transformer

Country Status (2)

Country Link
EP (1) EP0883326A3 (en)
JP (1) JP3309798B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3692897B2 (en) * 1999-06-18 2005-09-07 株式会社村田製作所 Speaker device and speaker system
JP5421845B2 (en) * 2010-04-23 2014-02-19 パナソニック株式会社 Vehicle theft alarm sound drive circuit
WO2023283784A1 (en) * 2021-07-12 2023-01-19 天津大学 Piezoelectric mems loudspeaker system
CN113840217A (en) * 2021-07-12 2021-12-24 天津大学 Piezoelectric MEMS loudspeaker system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5799899A (en) * 1980-12-12 1982-06-21 Sanyo Electric Co Ltd Electro-acoustic converter
DE19519594A1 (en) * 1994-05-30 1995-12-07 Tabuchi Denki Kk Electrical transformer with overlapping primary and secondary windings
JPH0864432A (en) * 1994-08-26 1996-03-08 Matsushita Electric Works Ltd Electromagnetic device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5799899A (en) * 1980-12-12 1982-06-21 Sanyo Electric Co Ltd Electro-acoustic converter
DE19519594A1 (en) * 1994-05-30 1995-12-07 Tabuchi Denki Kk Electrical transformer with overlapping primary and secondary windings
JPH0864432A (en) * 1994-08-26 1996-03-08 Matsushita Electric Works Ltd Electromagnetic device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 185 (E - 132) 21 September 1982 (1982-09-21) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 07 31 July 1996 (1996-07-31) *

Also Published As

Publication number Publication date
JP3309798B2 (en) 2002-07-29
JPH1155783A (en) 1999-02-26
EP0883326A2 (en) 1998-12-09

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