| |
 |
|
Class Information
Number: 381/421
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Electromagnetic (e.g., dyynamic) > Magnetic circuit > Having central magnetic portion > Plural magnets
Description: Subject matter having more than one permanent magnet or one permanent magnet and an electromagnet generated by a field coil.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7450729 |
Low-profile transducer |
Nov. 11, 2008 |
| 7412065 |
Acoustic transducer with folded diaphragm |
Aug. 12, 2008 |
| 7412066 |
Microphone |
Aug. 12, 2008 |
| 7388964 |
Loudspeaker, and module and electronic apparatus using the loudspeaker |
Jun. 17, 2008 |
| 7379554 |
Drive unit for electro-acoustic converter with dual magnetic circuits sharing permanent magnet |
May. 27, 2008 |
| 7376240 |
Coil for an electroacoustic transducer |
May. 20, 2008 |
| 7317810 |
Magnetic circuit and speaker |
Jan. 8, 2008 |
| 7302077 |
Electromagnetic driver for a planar diaphragm loudspeaker |
Nov. 27, 2007 |
| 7263199 |
Microphone assembly |
Aug. 28, 2007 |
| 7251342 |
Single end planar magnetic speaker |
Jul. 31, 2007 |
| 7242787 |
Electromagnetic driving unit for a loudspeaker assembly |
Jul. 10, 2007 |
| 7227970 |
Shorting ring fixture for electromagnetic transducer |
Jun. 5, 2007 |
| 7203332 |
Magnet arrangement for loudspeaker |
Apr. 10, 2007 |
| 7197155 |
Magnet assembly for loudspeakers |
Mar. 27, 2007 |
| 7158651 |
Electromagnetic driver for a planar diaphragm loudspeaker |
Jan. 2, 2007 |
| 7146019 |
Planar ribbon electro-acoustic transducer with high SPL capability and adjustable dipole/monopole low frequency radiation |
Dec. 5, 2006 |
| 7142687 |
Electroacoustic converter |
Nov. 28, 2006 |
| 7106878 |
Speaker and mobile terminal device |
Sep. 12, 2006 |
| 7099489 |
Twin magnetic loop multifunctional vibrator-speaker transducer |
Aug. 29, 2006 |
| 7068807 |
Speaker device |
Jun. 27, 2006 |
| 7065225 |
Electromagnetic transducer having a low reluctance return path |
Jun. 20, 2006 |
| 7062063 |
Electroacoustic transducer |
Jun. 13, 2006 |
| 7054460 |
Micromachined magnetically balanced membrane actuator |
May. 30, 2006 |
| 7035425 |
Frequency response enhancements for electro-dynamic loudspeakers |
Apr. 25, 2006 |
| 7020301 |
Loudspeaker |
Mar. 28, 2006 |
| 7006654 |
Push-pull electromagnetic transducer with increased Xmax |
Feb. 28, 2006 |
| 7006653 |
Compact high performance speaker |
Feb. 28, 2006 |
| 6996247 |
Push-push multiple magnetic air gap transducer |
Feb. 7, 2006 |
| 6940992 |
Push-push multiple magnetic air gap transducer |
Sep. 6, 2005 |
| 6917690 |
Electromagnetic transducer having multiple magnetic air gaps whose magnetic flux is in a same direction |
Jul. 12, 2005 |
| 6914998 |
Speaker apparatus |
Jul. 5, 2005 |
| 6912292 |
Concentric co-planar multiband electro-acoustic converter |
Jun. 28, 2005 |
| 6870285 |
Long stroke linear voice coil actuator with the proportional solenoid type characteristic |
Mar. 22, 2005 |
| 6804369 |
Electroacoustic transducer |
Oct. 12, 2004 |
| 6795564 |
Energy converter with two coils and two magnetic gaps |
Sep. 21, 2004 |
| 6766034 |
Multifunction acoustic device |
Jul. 20, 2004 |
| 6744895 |
Loudspeaker |
Jun. 1, 2004 |
| 6744904 |
Multifunction acoustic device |
Jun. 1, 2004 |
| 6741721 |
Informing apparatus for mobile communication apparatus |
May. 25, 2004 |
| 6738490 |
Loudspeaker with independent magnetic dampening and excursion control |
May. 18, 2004 |
| 6681027 |
Magnetic core for speaker |
Jan. 20, 2004 |
| 6671385 |
Speaker and magnetic circuit used for the speaker |
Dec. 30, 2003 |
| 6668066 |
Electroacoustic transducer with small dimensions |
Dec. 23, 2003 |
| 6621911 |
Multifunction acoustic device |
Sep. 16, 2003 |
| 6611606 |
Compact high performance speaker |
Aug. 26, 2003 |
| 6574346 |
Bass reproduction speaker apparatus |
Jun. 3, 2003 |
| 6404896 |
Electric-acoustic transducer having dual voice coil drivers |
Jun. 11, 2002 |
| 6389148 |
Electric-acoustic transducer having moving magnet and transducing method thereof |
May. 14, 2002 |
| 6373362 |
Signal converter |
Apr. 16, 2002 |
| 6359997 |
Loudspeaker having radially magnetized magnetic ring |
Mar. 19, 2002 |
|
|
|
