EP 1123634 A1 20010816 - PARAMETRIC LOUDSPEAKER WITH ELECTRO-ACOUSTICAL DIAPHRAGM TRANSDUCER
Title (en)
PARAMETRIC LOUDSPEAKER WITH ELECTRO-ACOUSTICAL DIAPHRAGM TRANSDUCER
Title (de)
PARAMETRISCHER LAUTSPRECHER MIT ELEKTROAKUSTISCHER MEMBRAN
Title (fr)
HAUT-PARLEUR PARAMETRIQUE DOTE D'UN TRANSDUCTEUR A MEMBRANE ELECTROACOUSTIQUE
Publication
Application
Priority
- US 9919580 W 19990826
- US 15944298 A 19980924
Abstract (en)
[origin: WO0018182A1] A parametric loudspeaker that directly generates multiple high frequencies to indirectly create lower frequencies through the use of substantially monolithic film transducers that are generally larger than a wavelength of the carrier frequency in diameter or cross section. These film transducers (33) include electrostatic, electret, PVDF, electrothermal mechanical film, and planar magnetic configurations. Metal, foam, plastic or wood support structures or stators (31) may be used to support the film transducers. An alternative configuration may include a movable diaphragm stretched along the core member and displaced a short distance within a strong portion of a magnetic field. At least one, low mass, planar, conductive coil is disposed on the movable diaphragm and includes two contacts for enabling current flow through the coil to produce a first magnetic field to attract and repel the diaphragm at a desired frequency for development of a series of compression waves which may be adjusted to include an ultrasonic frequency range.
IPC 1-7
IPC 8 full level
H04R 3/00 (2006.01); H04R 7/02 (2006.01); H04R 17/00 (2006.01); H04R 19/00 (2006.01); H04R 19/02 (2006.01)
CPC (source: EP)
H04R 19/00 (2013.01); H04R 2217/03 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0018182 A1 20000330; AU 5902099 A 20000410; BR 9913954 A 20020213; CA 2345339 A1 20000330; CN 1181704 C 20041222; CN 1331901 A 20020116; CN 1620195 A 20050525; EP 1123634 A1 20010816; EP 1123634 A4 20060419; HK 1041763 A1 20020719; JP 2002526004 A 20020813
DOCDB simple family (application)
US 9919580 W 19990826; AU 5902099 A 19990826; BR 9913954 A 19990826; CA 2345339 A 19990826; CN 200410087797 A 19990826; CN 99812680 A 19990826; EP 99946657 A 19990826; HK 02103388 A 20020504; JP 2000571709 A 19990826