JPH04115698A - Flat speaker - Google Patents

Flat speaker

Info

Publication number
JPH04115698A
JPH04115698A JP23174090A JP23174090A JPH04115698A JP H04115698 A JPH04115698 A JP H04115698A JP 23174090 A JP23174090 A JP 23174090A JP 23174090 A JP23174090 A JP 23174090A JP H04115698 A JPH04115698 A JP H04115698A
Authority
JP
Japan
Prior art keywords
voice coil
anisotropy
sintering
casting
radial direction
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.)
Pending
Application number
JP23174090A
Inventor
Shoichi Kusumoto
Original Assignee
Matsushita Electric Ind 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 Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP23174090A priority Critical patent/JPH04115698A/en
Publication of JPH04115698A publication Critical patent/JPH04115698A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To expand a reproduction band by making a magnet made by sintering or casting or the like and having an anisotropy in the radial direction composite with a flat diaphragm and providing two voice coils with a large diameter and a small diameter to the speaker.
CONSTITUTION: A magnet 18 made by sintering or casting or the like and having an anisotropy in the radial direction is fitted to an upper outer side of a yoke 16 by an adhesives to form an outer magnetic circuit. Moreover, a magnet 19 made by sintering or casting or the like and having an anisotropy in the radial direction forming an inner magnetic circuit is fitted to an outer peripheral surface at the upper part of a center pole of a plate 17. Then a perpendicularly bended fixed part 24 of a large diameter voice coil bobbin 26 is fixed to a lower face of a flat diaphragm 21 and a perpendicularly bended fixed part 25 folded of a small diameter voice coil bobbin 27 is fixed to a lower face of the flat diaphragm 21. Then a node circle caused by a primary resonance is driven by a large diameter voice coil 28, and a node circle caused by a secondary resonance is driven by a small diameter voice coil 29. Thus, the reproduction band is expanded up to a frequency at which a ternary resonance takes place.
COPYRIGHT: (C)1992,JPO&Japio
JP23174090A 1990-08-31 1990-08-31 Flat speaker Pending JPH04115698A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23174090A JPH04115698A (en) 1990-08-31 1990-08-31 Flat speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23174090A JPH04115698A (en) 1990-08-31 1990-08-31 Flat speaker

Publications (1)

Publication Number Publication Date
JPH04115698A true JPH04115698A (en) 1992-04-16

Family

ID=16928298

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23174090A Pending JPH04115698A (en) 1990-08-31 1990-08-31 Flat speaker

Country Status (1)

Country Link
JP (1) JPH04115698A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6411723B1 (en) 1998-06-22 2002-06-25 Slab Technology Limited Loudspeakers
JPWO2005117489A1 (en) * 2004-05-27 2008-04-03 松下電器産業株式会社 Speaker
JP2009147547A (en) * 2007-12-12 2009-07-02 Foster Electric Co Ltd Circular plate type speaker
JP2009206902A (en) * 2008-02-28 2009-09-10 Pioneer Electronic Corp Speaker
JP2009253411A (en) * 2008-04-02 2009-10-29 Foster Electric Co Ltd Circular flat plate type speaker by doughnut-shape diaphragm
JP2015119466A (en) * 2013-12-18 2015-06-25 現代自動車株式会社 Sound generator of vehicle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6411723B1 (en) 1998-06-22 2002-06-25 Slab Technology Limited Loudspeakers
JPWO2005117489A1 (en) * 2004-05-27 2008-04-03 松下電器産業株式会社 Speaker
US8031902B2 (en) 2004-05-27 2011-10-04 Panasonic Corporation Loudspeaker
JP2009147547A (en) * 2007-12-12 2009-07-02 Foster Electric Co Ltd Circular plate type speaker
JP2009206902A (en) * 2008-02-28 2009-09-10 Pioneer Electronic Corp Speaker
JP2009253411A (en) * 2008-04-02 2009-10-29 Foster Electric Co Ltd Circular flat plate type speaker by doughnut-shape diaphragm
JP2015119466A (en) * 2013-12-18 2015-06-25 現代自動車株式会社 Sound generator of vehicle

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