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Electrical Audio Signal Processing Systems And Devices > Electro-acoustic Audio Transducer > Electromagnetic (e.g., Dyynamic) > Magnetic Circuit Magnetic CircuitMagnetic Circuit patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.10/18/07 - 20070242849 - Loudspeaker with high power efficiency and low resonance frequency A loudspeaker with high power efficiency and low resonance frequency is achieved by having a damper directly or indirectly sleeving beside a coil on a voice coil so that gravity center of loudspeaker is low and stable and the voice coil does not dislocate easily to keep acoustic performance of ... 09/27/07 - 20070223777 - Loudspeaker having an interlocking magnet structure A magnet structure for use with a loudspeaker may have an interlocking mechanism. The magnet structure may include a magnet, a shell pot and a core cap. The shell pot may contain the magnet in its hollow interior. The magnet may be a single magnet or double magnets. The core ... 09/06/07 - 20070206830 - Electroacoustic transducer and electronic apparatus In an electroacoustic transducer of the present invention, a casing supports a diaphragm, a drive coil is provided on the diaphragm, a first magnetic structure has a first space in a center thereof provided within the casing such that a center axis penetrates the first space, and a second magnetic ... 03/01/07 - 20070047755 - Diffuser, speaker device, and method of manufacturing speaker device A speaker device which makes it possible to prevent the entry of foreign matter such as magnetic dust into a magnetic gap through the gap between a diffuser and a voice coil bobbin, to thereby improve the operational reliability and service life of the product. In a speaker device in ... 02/01/07 - 20070025587 - Subwoofer design and isolator therefor A speaker has a magnet assembly, a basket and a voice coil mounted in the flux gap of the magnet assembly. A spider mounts the voice coil to align it. A sound radiator, for producing sound, is connected by a connector to the voice coil. An isolator extends across the ... 01/04/07 - 20070003100 - Loudspeaker structure with a lighting effect A loudspeaker structure with a lighting effect includes a support frame having a magnetic circuit disposed at the bottom of the support frame, a voice coil installed above the magnetic circuit, a diaphragm adhered on the voice coil, and a suspending edge disposed between the diaphragm and the support frame, ... 11/16/06 - 20060256997 - Electro-acoustic converter with demountable diaphragm and voice coil assembly A loudspeaker drive unit includes at least one voice coil, a diaphragm, permanent magnet element and pole piece element. The permanent magnet element and pole piece element form a magnetic circuit with a pole gap arranged to receive and interact with the voice coil. The magnetic circuit is arranged to ... 10/05/06 - 20060222200 - 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 coil bobbin 21 and voice coils 22 and 23 wound around and fixed to ... 09/28/06 - 20060215873 - 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 constituting one of the opposed surfaces. The magnetic circuit further ... 09/28/06 - 20060215872 - Compact high performance speaker A speaker has an annular magnet structure. First and second annular magnets are arranged concentrically with each other and connected by a shunt at one end and a pole-defining structure at the other end to concentrate magnetic flux in a cylindrical voice coil gap. The shunt and pole structure are ... 09/21/06 - 20060210107 - Speaker driver An electro-acoustical 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 and surrounded by regions of lower intensity magnetic field, and an electrically conductive and mobile member disposed in and capable of moving ... 08/17/06 - 20060182304 - Speaker, module employing it, electronic apparatus and device Shield cover (29) made of a magnetic material covers yoke (23) in internal magnetic circuit (24) of a speaker so as to reduce magnetic leakage from internal magnetic circuit (24). ... 08/10/06 - 20060177091 - Speaker and method of manufacturing the same A loudspeaker is provided, which has a configuration in which suspension holder extending in a cylindrical shape widening downward is provided on the rear surface of diaphragm so as to be integrated with diaphragm, and the periphery of suspension holder is coupled to frame via second edge. With such a ... 06/01/06 - 20060115107 - Inertial voice type coil actuator The present invention provides an intertial-type voice actuator that includes a magnetic flux conductive material core with a continuous channel. The channel has antifringing groove. The actuator employs a radially polarized cylindrical magnet spaced in the channel to form a magnetic gap and a conductive coil positioned at least partially ... 05/04/06 - 20060093180 - Magnetic circuit having dual magnets, speaker and vibration generating apparatus using the same A magnetic circuit having a dual magnet, a speaker and a vibration generating apparatus using the same are provided. The magnetic circuit includes a magnetic gap having a small magnetic loss and an increasing magnetic flux density, in which a uniform distribution of a line of magnetic force can be ... 03/09/06 - 20060050922 - Speaker, and module and electronic device using the such speaker A loudspeaker is provided that satisfies requirements for both a small size and a high sound pressure. In addition, the heat capacity of the magnetic circuit and the heat dissipation of the voice coil are improved in this loudspeaker. Using at least two pieces of bar magnets (21), an outer ... 03/02/06 - 20060045305 - 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. ... 01/26/06 - 20060018503 - Speaker device, magnetic circuit for use in speaker device, and method of manufacturing magnetic circuit It is an object of the present invention to provide an improved speaker device which can reduce parts-cost by simplifying a cutting treatment for processing yoke and center pole, ensure an easy operation of installing short rings and an extremely simple assembling. The speaker device has a center pole on ... 01/26/06 - 20060018502 - Speaker unit, method for fabricating the same, and speaker apparatus A speaker apparatus is configured such that a speaker unit including a single magnetic circuit system, a plurality of vibration systems and a case is housed inside a speaker box. In the speaker unit, magnetic gaps having a magnetic field of the same magnitude are defined by a magnet holder, ... 12/22/05 - 20050281432 - Speaker device The speaker device includes the magnetic circuit system having an annular plate and magnetic fluid, and a vibration system having a voice coil bobbin and a voice coil. When the speaker device is not driven, the voice coil is located at a predetermined stationary position within the magnetic gap filled ... 12/08/05 - 20050271242 - Speaker The present invention is to provide a solution to reduce temperature increase of a voice coil. A vibrating portion includes a voice coil, a tubular voice coil bobbin, and a diaphragm. A magnetic circuit includes an annular top plate, an annular magnet bonded to a lower surface of the top ... 10/13/05 - 20050226458 - Speaker In a speaker having a magnet circuit causing vibrations of a diaphragm and attached to and supported on a frame, a plurality of projections is formed on a bottom portion of the frame supporting the magnetic circuit. The projections are in point contact with a rear-facing face of a flange ... 10/13/05 - 20050226457 - 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 piece enclose a magnetic ... 09/22/05 - 20050207611 - Drive unit for electro-acoustic converter with radially magnetized permanent magnetic bars An electro-acoustic drive unit includes at least one permanent magnet assembly and at least an inner pole piece and an outer pole piece forming a pair of pole pieces, the permanent magnet assembly together with the pair of pole pieces forming a magnetic circuit with a pole gap for exciting ... 09/08/05 - 20050196012 - 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 connected ... 09/01/05 - 20050190945 - Shorting ring fixture for electromagnetic transducer An electromagnetic transducer such as an audio speaker, having a motor structure in which a shorting ring that sinks eddy currents also serves as a permanent fixture to provide coaxial alignment of two or more components within the transducer. These components could include various combinations of the yoke, the top ... 08/18/05 - 20050180593 - Multifunction speaker A multifunction speaker comprises a frame made of an insulation material and having a terminal supporting portion, a pair of supporting springs are partly embedded in the frame. A magnetic circuit is resiliently supported in the frame by the springs, a diaphragm is secured to the frame, a coil is ... 07/14/05 - 20050152573 - Pot type yoke, speaker apparatus and method of manufacturing pot type yoke A pot type yoke has a bottom portion, and a wall portion provided upward on the bottom portion. This pot type yoke is provided with a mark for the purpose of distinguishing it from other kinds of the pot type yokes. ... 06/16/05 - 20050129265 - Exciter for directly vibrating board and speaker apparatus used the same An exciter for directly vibrating a board treated for dustproofing and heat dissipation, provided with a vibrator comprised of an outer yoke, a permanent magnet, and inner yoke, having a coil fixed inserted between the outer yoke and inner yoke, and having a coupler member for coupling the exciter to ... 06/09/05 - 20050123166 - Structure of speaker A structure of speaker is disclosed. The disclosed speaker structure includes at least a bobbin, a coil, a membrane, and a magnetic assembly. The coil is wound around the side surface of the bobbin, and the membrane is disposed at end of the bobbin. Besides, the magnetic assembly is suspended ... ### FreshPatents.com Support |