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| Number | Title | Issue Date |
| 8139816 | Acoustic transducer This invention relates to acoustic drivers with stationary and moving coils. Time varying signals are applied to the moving and stationary coils to control the movement of a diaphragm, which produces audible sound. The time varying signals correspond to an input aud... | 03/20/2012 |
| 8121337 | Free air magnetic circuit and speaker Disclosed is a free air magnetic circuit and speaker in which no pole piece is used. A magnet layer is located between a top plate and a back plate with a gap defined essentially in the center thereof. Into the gap, a wire coil attached to a diaphragm may be inserte... | 02/21/2012 |
| 7903837 | Magnetic circuit for speaker device and speaker device A magnetic circuit for a speaker device includes a yoke having a pole piece main body formed into a cylindrical shape or a hollow cylindrical column shape, and a flange part provided on an outer side thereof, a magnet arranged on the flange part, a plate arranged on... | 03/08/2011 |
| 7676053 | Electrodynamic loudspeaker An electrodynamic loudspeaker 1 includes a magnetic circuit 10 and a vibrator 20. The magnetic circuit 10 includes a magnet 11 and poles 12 and 13 adhering to the magnet 11. The vibrator 20 includes a co... | 03/09/2010 |
| 7653209 | Speaker apparatus A speaker apparatus includes at least one of an inner flux applicator and an outer flux applicator includes an annular first member and an annular second member. The first member having a first surface that faces toward the magnetic gap, the first member satisfying ... | 01/26/2010 |
| 7457429 | Laminated motor structure for electromagnetic transducer An electromagnetic transducer such as an audio speaker having at least one of the soft magnetic components of its motor assembly constructed as a laminated structure of electrically insulated magnetically conductive sections. Eddy currents, which would have been ind... | 11/25/2008 |
| 7443995 | Acoustic loudspeaker An acoustic driver has a voice coil in which adjacent turns of the coil are spaced apart. The driver is placed at one end of a foam-lined, elongated structure, such as a tube. An opposing end of the structure is, in one embodiment, enclosed by a wall that is connect... | 10/28/2008 |
| 7433487 | Speaker A speaker includes a magnet, a yoke, and a coil. A surface of the magnet opposed to the yoke includes a first magnetized surface at one side in the moving direction of the coil and a second magnetized surface at the other side in the moving direction of the coil. Th... | 10/07/2008 |
| 7412071 | Low-inductance electromagnetic drive without driving the magnetic flux circuit The present invention relates to a low-inductance electromagnetic drive without driving magnetic flux circuit, which comprises a magnetic pole, a drive coil, an upper magnetic inductive board, a permanent magnet and a lower magnetic-inductive board. The magnetic pol... | 08/12/2008 |
| 7400740 | Core cap for loudspeaker A core cap or top plate for use with loudspeakers that includes offset adhesive control grooves on the opposite faces of the disk-like core cap is disclosed. The grooves are offset from one another by a distance that makes the smallest dimension between any feature ... | 07/15/2008 |
| 7376240 | Coil for an electroacoustic transducer An electroacoustic transducer comprising a magnetic circuit of a magnetically conductive material with a pair of opposed surfaces defining a gap therebetween, the magnetic circuit comprising a magnet inducing a magnetic field in the gap, the magnet having a surface ... | 05/20/2008 |
| 7376239 | Electromechanical transducer and method for transforming energies An electromechanical transducer comprising at least one transducer element which has a multilayer structure comprising at least two layers such that the transducer element is capable of changing its thickness. The transducer element allows air to flow inside the tra... | 05/20/2008 |
| 7302076 | Low profile speaker and system A speaker has a magnet structure mounted ahead of the speaker diaphragm to produce a shallow compact unit. The magnet structure defines a flux gap, and a voice coil residing in the flux gap is connected to a main diaphragm such that drive current applied to the voic... | 11/27/2007 |
| 7283642 | Moving-coil electrodynamic motor for a loudspeaker, loudspeaker and pole piece The invention relates to a moving-coil electrodynamic motor and a loudspeaker. A moving-coil includes a winding with a given number of turns. A motor comprises a magnet arranged between a front pole piece and a rear pole piece. The front pole piece and the rear pole... | 10/16/2007 |
| 7272238 | Loudspeaker having cooling system A loudspeaker has a cooling system in which a pole piece has a shorting ring made of non-magnetic conductive material that stabilizes magnetic field to reduce distortion of sound and a heat dissipation plate that couples to the shorting ring to facilitate efficient ... | 09/18/2007 |
| 7242787 | Electromagnetic driving unit for a loudspeaker assembly An electromagnetic driving unit includes a magnet part and a coil part that is translatable along a translation axis with respect to the magnet part. A diaphragm extends from the coil part in a substantially radial direction with respect to the translation axis of t... | 07/10/2007 |
| 7197155 | Magnet assembly for loudspeakers A magnet assembly having inner and outer yokes of magnetic flux conductive material which together define an annular air gap and a radially oriented magnet sandwiched between the inner and outer yokes such that a first face of a first magnetic polarity contacts the ... | 03/27/2007 |
| 7187779 | Electromagnetic transducer and portable communication device An electromagnetic transducer includes a magnetic member, a suspension for supporting the magnetic member at a central portion of the suspension, a diaphragm connected to the suspension, a magnet for generating magnetic flux on the magnetic member, and a coil for ge... | 03/06/2007 |
| 7142685 | Adjustable loudspeaker A loudspeaker motor structure uses variable geometry to change the effective magnetic field acting on the voice coil of the motor structure. A magnet generates the magnetic field, which couples into a front plate, a back plate, and a pole piece. In one loudspeaker, ... | 11/28/2006 |
| 7142687 | Electroacoustic converter An electroacoustic transducer 20, such as a speaker, a headphone, an earphone, a microphone, an acoustic wave sensor, etc., includes magnet plates 21 and 22, the entirety of which are formed like a disk or a ring; and an acoustic diaphragm 23... | 11/28/2006 |
| 7120271 | Internal magnetic circuit and loudspeaker system incorporating the same An internal magnetic circuit is formed by a plate forming a pole piece, a vertically magnetized magnet attached to a bottom face of the plate, and a yoke attached to a bottom face of the magnet. A magnetic gap is formed between the plate and the yoke. The yoke inclu... | 10/10/2006 |
| 7065225 | Electromagnetic transducer having a low reluctance return path An electromagnetic transducer, such as an audio speaker, includes a return path member which is a pole piece for external magnet geometries or a cup for internal magnet geometries. The magnetic flux return path for the primary drive magnet is through a first portion... | 06/20/2006 |
| 7062063 | Electroacoustic transducer An electroacoustic transducer includes a magnetic circuit of a magnetically conductive material with a pair of opposed surfaces defining a gap therebetween. The magnetic circuit includes a magnet inducing a magnetic field in the gap, the magnet having a surface cons... | 06/13/2006 |
| 7057314 | Electromagnetic motor system capable of removing heat away from its magnetic gap An electromagnetic drive motor assembly (EDMA) has at least one bridge that extends along a radial direction to conduct heat away from the magnetic gap and towards the outer surface of the EDMA. The EDMA includes a conductive ring between a first plate and a second ... | 06/06/2006 |
| 7054460 | Micromachined magnetically balanced membrane actuator The present invention relates to an miniature actuator especially suitable for hearing aid applications. The actuator according to the present invention operates according to the change in reluctance principle. In particular, the actuator according to the present in... | 05/30/2006 |
| 7039213 | Speaker driver An electro-mechanical transducer, including a magnetic assembly producing a magnetic field having two or more displaced regions of greater intensity, having magnetic flux in substantially similar directions, separated by and surrounded by regions of lower intensity ... | 05/02/2006 |
| 7031489 | Magnetic circuit for speaker with short-circuiting ring A magnetic circuit for a speaker comprises: a bottom yoke including a center pole; a ring magnet; a top plate; and a short-circuiting ring shaped like a hollow cylinder. The short-circuiting ring is disposed close and parallel to a voice coil and attached to the inn... | 04/18/2006 |
| 7012345 | Electromagnetic motor with flux stabilization ring, saturation tips, and radiator The present invention provides an electromagnetic drive motor assembly (EDMA) that has an inner flux return assembly formed from an upper pole piece and a lower pole piece oppositely disposed relative to each other along the center of the EDMA. An annularly position... | 03/14/2006 |
| 6996247 | Push-push multiple magnetic air gap transducer An electromagnetic transducer such as an audio speaker, having a push-push geometry in which there are two or more air gaps and the magnetic flux across the air gaps is in the same orientation. If there are more than one voice coil, the voice coils may thus be gener... | 02/07/2006 |
| 6962667 | Process for producing polymer optical waveguide A process for producing a polymer optical waveguide including the steps of: preparing a mold by applying a mold-forming resin layer onto a master template, peeling the layer from the master template to obtain a template, and cutting both ends of the template to expo... | 11/08/2005 |
| 6940992 | Push-push multiple magnetic air gap transducer An electromagnetic transducer, such as an audio speaker, includes a return path member which is a pole piece for external magnet geometries or a cup for internal magnet geometries. The magnetic flux return path for the primary drive magnet is through a first portion... | 09/06/2005 |
| 6920230 | Electromagnetic transducer and portable communication device An electromagnetic transducer includes: a first diaphragm; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having a first opening in a central portion thereof; a yoke disposed so as to oppo... | 07/19/2005 |
| 6917690 | Electromagnetic transducer having multiple magnetic air gaps whose magnetic flux is in a same direction An electromagnetic transducer such as an audio speaker exhibiting highly linear performance over a greatly extended excursion. The motor structure includes a stack of two or more magnet and plate pairs, with the magnets polarized in the same orientation such that th... | 07/12/2005 |
| 6847726 | Shorting rings in dual-coil dual-gap loudspeaker drivers Loudspeaker and other transducers of the dual-voice-coil/dual-magnetic-gap type can be improved by the addition of one or more annular shorting rings strategically located in the vicinity of the two magnetic gaps. The shorting rings have no effect on a steady state ... | 01/25/2005 |
| 6807283 | Electroacoustic transducer A core having a coil wound thereon is fixed to a base at the bottom. The base is fixed to a case made of synthetic resin by insert molding. A diaphragm is fixed to the case in circumference, and also a magnetic flux guide member is fixed to the case in circumference... | 10/19/2004 |
| 6804369 | Electroacoustic transducer An electroacoustic transducer 1 includes a base 24 made of a magnetic material; a magnetic core 22 made of a magnetic material and upstanding on the base 24; a diaphragm 20 made of a magnetic material and spaced from a leading end ... | 10/12/2004 |
| 6774510 | Electromagnetic motor with flux stabilization ring, saturation tips, and radiator The present invention provides an electromagnetic drive motor assembly (EDMA) that has an inner flux return assembly formed from an upper pole piece and a lower pole piece oppositely disposed relative to each other along the center of the EDMA. An annularly position... | 08/10/2004 |
| 6768806 | Shorting rings in dual-coil dual-gap loudspeaker drivers Loudspeakers and other transducers of the dual-voice-coil/dual-magnetic-gap type can be improved by the addition of one or more annular shorting rings strategically located in the vicinity of the two magnetic gaps. The shorting rings have no effect on a steady state... | 07/27/2004 |
| 6713904 | Linear voice coil actuator with compensating coils An actuator is provided in which one or more separate compensating coils are employed to alter the distribution of the magnetic flux density in the air gap to produce a substantially constant force throughout the stroke; and in which current in the separate compensa... | 03/30/2004 |
| 6681027 | Magnetic core for speaker A magnetic core for speaker is constructed to include an annular magnet connectable to the body of the speaker, a center magnet mounted in the center of the annular magnet and connectable to the body of the speaker, an annular magnetically conducting plat... | 01/20/2004 |
