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Class Information
Number: 181/161
Name: Acoustics > Diaphragm > With direct mechanical connection to drive unit
Description: Subject matter including a mechanical means which directly connects the diaphragm to a driver unit.










Sub-classes under this class:

Class Number Class Name Patents
181/162 Stylus bar 2


Patents under this class:

Patent Number Title Of Patent Date Issued
8628830 Method of and device for modifying the properties of a membrane for an electroacoustic transducer Jan. 14, 2014
8295536 Moving magnet levered loudspeaker Oct. 23, 2012
8180096 Loudspeaker May. 15, 2012
7983432 Point excitation placement in an audio transducer Jul. 19, 2011
7918309 Apparatus for producing a continuous sonic boom Apr. 5, 2011
7853025 Vehicular audio system including a headliner speaker, electromagnetic transducer assembly for use therein and computer system programmed with a graphic software control for changing the audio Dec. 14, 2010
7714685 Electromagnetically operated unit, in particular a clutch, brake and/or lock May. 11, 2010
7418109 Diaphragm structure of light sound converter Aug. 26, 2008
7306073 Electroacoustic transducer comprising a membrane with a middle area comprising stiffening grooves Dec. 11, 2007
7258195 Electromagnetic holding brake Aug. 21, 2007
7155021 Loudspeaker having an acoustic panel and an electrical driver Dec. 26, 2006
7050593 Vehicular audio system and electromagnetic transducer assembly for use therein May. 23, 2006
6870941 Dipole radiating dynamic speaker Mar. 22, 2005
6748090 Multi-mode radiator panels Jun. 8, 2004
6672423 Speaker and method of assembling the speaker Jan. 6, 2004
6578661 Speaker apparatus Jun. 17, 2003
6513623 Speaker Feb. 4, 2003
6484844 Speaker Nov. 26, 2002
6474440 Diaphragm for speaker and speaker device provided with the same Nov. 5, 2002
6438242 Acoustic transducer panel Aug. 20, 2002
6307133 Drumhead dampening device Oct. 23, 2001
6201878 Portable compact disc player Mar. 13, 2001
6095278 Base for holding the tweeter of a speaker Aug. 1, 2000
5424496 Electromagnetic converter Jun. 13, 1995
5125031 Speaker system with focused vibration Jun. 23, 1992
5081387 Pump motor/basket brake for an automatic washer Jan. 14, 1992
5022084 Speaker Jun. 4, 1991
4998283 Screen device Mar. 5, 1991
4967871 Body-sensible acoustic device Nov. 6, 1990
4961227 Portable loud speaker system Oct. 2, 1990
4837833 Microphone with frequency pre-emphasis channel plate Jun. 6, 1989
4823907 Balloon assembly Apr. 25, 1989
4808202 Adsorptive fiber sheet Feb. 28, 1989
4805732 Motor powered sound emitter Feb. 21, 1989
4483411 Tunable marine seismic source Nov. 20, 1984
4433750 Synthetic horn projector with metal insert Feb. 28, 1984
4379951 Electro-acoustic transducer means Apr. 12, 1983
4379952 Mechanical filter for an electrodynamic transducer Apr. 12, 1983
3992016 Simplified phonograph Nov. 16, 1976
3939942 Electroacoustic transducers Feb. 24, 1976
3937905 Moving voice coil transducer having a flat diaphragm of an impregnated knit Feb. 10, 1976











 
 
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