| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381420000 | Having central magnetic portion | 6 |
| 20110261992 | MAGNETIC CIRCUIT UNIT AND SPEAKER USING SAME - A magnetic circuit unit includes a yoke, a magnet positioned on the yoke, a plate on the magnet. The yoke includes a bottom defining a central hole therein, and a wall extending from the bottom. The magnet is positioned on the bottom of the yoke. The plate defines a base coupled to a top surface of the magnet, and a central pole extending from the base and getting through the annular magnet with an end thereof suspended in the central hole of the yoke. Thus, a first magnetic gap is formed between the wall of the yoke and an outer side of the annular magnet, and a second magnetic gap is formed between the central pole of the plate and an inner side of the annular magnet. A speaker using the magnetic circuit unit described above is disclosed. | 10-27-2011 |
| 20140348374 | MAGNETIC CIRCUIT FOR LOUDSPEAKER, AND LOUDSPEAKER USING SAME - The loudspeaker magnetic circuit is an external-magnet type, and has a magnet, an upper plate, and a lower plate. The magnet is sandwiched between the upper plate and the lower plate. At least one of the lower plate and the upper plate is formed of magnetic powder or a mixture of a magnetic powder and resin. | 11-27-2014 |
| 20160165353 | Loudspeaker using Contour Field Hard Magnet Poles and Yoke Construction - Several embodiments of the instant invention incorporate a loudspeaker design utilizing hard magnetic poles and yokes. The magnetic field of the loudspeaker is created and guided with a series of critically formed hard magnetic structures guiding the magnetic field from the primary magnet to the gap in a loop of hard magnetic material, replacing the soft magnetic materials normally used. Magnetization of the components of the hard magnetic loudspeaker driver with radial pole patterns—a yoke radial magnet, a washer pole magnet and a yoke upper ring magnet—is performed with these components in their final assembly relationships. | 06-09-2016 |
| 381421000 | Plural magnets | 3 |
| 20090097694 | ELECTRO-ACOUSTIC TRANSDUCER AND ELECTRONIC DEVICE - An electro-acoustic transducer according to the present invention comprises: a diaphragm; a casing which is formed with an opening in a part thereof for directly or indirectly supporting therein the diaphragm; a first magnetic pole section which is provided on a side of the opening with respect to the diaphragm and has a magnetic pole at a surface thereof which faces the diaphragm; a second magnetic pole section which is provided on a side of an inner bottom surface of the casing with respect to the diaphragm and has a magnetic pole at least a part of a surface thereof which faces the first magnetic pole section through the diaphragm; and a drive coil which is provided on the diaphragm so as to be located in a magnetic gap formed by the first and second magnetic pole sections for generating a driving force so as to cause the diaphragm to vibrate in a direction perpendicular to a surface of the diaphragm. The magnetic poles of the first and second magnetic pole sections which face each other through the diaphragm have the same polarity. An outer shape of the surface of the first magnetic pole section which faces the diaphragm is smaller than that of the surface of the second magnetic pole section which faces the diaphragm. | 04-16-2009 |
| 20150365768 | MOTOR FOR DYNAMIC LOUDSPEAKER - A motor for a dynamic loudspeaker includes a pole plate; a plurality of magnets positioned on the pole plate having a plurality of outer magnets and an inner magnet. The motor further includes a plurality of magnet poles positioned on the magnets. The magnet poles include a plurality of outer magnet poles and an inner magnet pole. A coil is positioned in the air gap formed between the outer magnets and the inner magnet as well as between the outer magnet poles and the inner magnet pole. The coil has a concave shape formed by recessing a part of its circumference in a plane view. | 12-17-2015 |
| 20180027332 | Miniature speaker | 01-25-2018 |
