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Class Information
Number: 381/412
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Electromagnetic (e.g., dyynamic) > Magnetic circuit
Description: Subject matter including a path of magnetic flux from north pole to south pole of a magnet (or electromagnet) through a magnetic material.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7418108 |
Transducer for tactile applications and apparatus incorporating transducers |
Aug. 26, 2008 |
| 7412071 |
Low-inductance electromagnetic drive without driving the magnetic flux circuit |
Aug. 12, 2008 |
| 7400740 |
Core cap for loudspeaker |
Jul. 15, 2008 |
| 7388964 |
Loudspeaker, and module and electronic apparatus using the loudspeaker |
Jun. 17, 2008 |
| 7386144 |
Inertial voice type coil actuator |
Jun. 10, 2008 |
| 7382893 |
Loudspeaker with inverted cone |
Jun. 3, 2008 |
| 7324658 |
Speaker |
Jan. 29, 2008 |
| 7321664 |
Receiver having an improved bobbin |
Jan. 22, 2008 |
| 7319771 |
Vibrator for bone conducted hearing aids |
Jan. 15, 2008 |
| 7302077 |
Electromagnetic driver for a planar diaphragm loudspeaker |
Nov. 27, 2007 |
| 7302076 |
Low profile speaker and system |
Nov. 27, 2007 |
| 7289642 |
Audio speaker |
Oct. 30, 2007 |
| 7283642 |
Moving-coil electrodynamic motor for a loudspeaker, loudspeaker and pole piece |
Oct. 16, 2007 |
| 7277555 |
Electroacoustic transducer with built in transducer circuit |
Oct. 2, 2007 |
| 7254248 |
One-magnet rectangular transducer |
Aug. 7, 2007 |
| 7248714 |
Micro-speaker and method for assembling a micro-speaker |
Jul. 24, 2007 |
| 7246425 |
Method of manufacturing a speaker |
Jul. 24, 2007 |
| 7242787 |
Electromagnetic driving unit for a loudspeaker assembly |
Jul. 10, 2007 |
| 7236609 |
Electro-acoustic transducer with resistance to shock-waves |
Jun. 26, 2007 |
| 7231057 |
Multi-function actuator capable of preventing vibration |
Jun. 12, 2007 |
| 7231058 |
Electroacoustic transducer and electronic apparatus |
Jun. 12, 2007 |
| 7227970 |
Shorting ring fixture for electromagnetic transducer |
Jun. 5, 2007 |
| 7224817 |
Loudspeaker |
May. 29, 2007 |
| 7212647 |
Vibration actuator device of portable terminal |
May. 1, 2007 |
| 7200241 |
Loudspeaker |
Apr. 3, 2007 |
| 7197155 |
Magnet assembly for loudspeakers |
Mar. 27, 2007 |
| 7187779 |
Electromagnetic transducer and portable communication device |
Mar. 6, 2007 |
| 7184567 |
Thin speaker and method of manufacturing the speaker |
Feb. 27, 2007 |
| 7181041 |
Flat speaker of full-face driving |
Feb. 20, 2007 |
| 7177440 |
Electromagnetic transducer with asymmetric diaphragm |
Feb. 13, 2007 |
| 7164777 |
Speaker driver with detachable motor and basket |
Jan. 16, 2007 |
| 7158651 |
Electromagnetic driver for a planar diaphragm loudspeaker |
Jan. 2, 2007 |
| 7149322 |
Magnetic circuit for loudspeaker and loudspeaker comprising it |
Dec. 12, 2006 |
| 7149323 |
Speaker |
Dec. 12, 2006 |
| 7142685 |
Adjustable loudspeaker |
Nov. 28, 2006 |
| 7142687 |
Electroacoustic converter |
Nov. 28, 2006 |
| 7130441 |
Speaker system having processing circuitry |
Oct. 31, 2006 |
| 7120270 |
Audio device heat transferring |
Oct. 10, 2006 |
| 7120271 |
Internal magnetic circuit and loudspeaker system incorporating the same |
Oct. 10, 2006 |
| 7106881 |
Speaker |
Sep. 12, 2006 |
| 7106879 |
Loudspeaker |
Sep. 12, 2006 |
| 7103195 |
Speaker unit |
Sep. 5, 2006 |
| 7085394 |
Electro-acoustic transducer and electronic device |
Aug. 1, 2006 |
| 7082208 |
Speaker assembly having plural drivers |
Jul. 25, 2006 |
| 7068807 |
Speaker device |
Jun. 27, 2006 |
| 7065225 |
Electromagnetic transducer having a low reluctance return path |
Jun. 20, 2006 |
| 7062062 |
Electromagnetic sound producing device |
Jun. 13, 2006 |
| 7057314 |
Electromagnetic motor system capable of removing heat away from its magnetic gap |
Jun. 6, 2006 |
| 7058195 |
Speaker assembly |
Jun. 6, 2006 |
| 7039213 |
Speaker driver |
May. 2, 2006 |
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