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| Number | Title | Issue Date |
| 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 |
| 7227970 | 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... | 06/05/2007 |
| 7203332 | Magnet arrangement for loudspeaker An electro-dynamic loudspeaker includes a frame, a plurality of magnets and a diaphragm. The frame includes a molded plastic body. The magnets may be molded into the frame in a determined configuration. The frame is mechanically coupled to the diaphragm such that th... | 04/10/2007 |
| 7152299 | Method of assembling a loudspeaker Electro-dynamic loudspeakers typically include a diaphragm having a conductor applied to one of its surfaces. The diaphragm is secured to a frame. The conductor is connected to a power supply for providing electrical current through linear traces of the conductor th... | 12/26/2006 |
| 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 |
| 7024014 | Multiple voice-coil cone-driver A multiple voice-coil cone-driver for driving a loudspeaker includes a first voice-coil, and a second voice-coil coupled in parallel to the first voice-coil. Together, the first and second voice-coils in parallel are characterized by a baseline frequency response wi... | 04/04/2006 |
| 7006654 | Push-pull electromagnetic transducer with increased Xmax An electromagnetic transducer such as an audio speaker, having an improved geometry in the positioning of its voice coils relative to its magnetic air gaps, facilitating a greater linear travel. The transducer has a push-pull geometry with at least two voice coils. ... | 02/28/2006 |
| 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 |
| 6847139 | Multi-functional vibrating actuator An amount of movement of an air passing through a clearance G2 is adjusted by adjusting the clearance G2 by placing an outer shape surface 35 of a yoke 3 in proximity of an inner side surface of a housing 1. Accordingly, a vibratio... | 01/25/2005 |
| 6834113 | Loudspeaker system A loudspeaker system, which has the ability to create a homogeneous sound over large distances, comprising at least one line-source of acoustical radiation, each comprising three or more essentially identical speaker-units arranged adjacent to each other at a center... | 12/21/2004 |
| 6810126 | Planar magnetic transducer A panel transducer includes a diaphragm with areas of multiple electrical conductors, two rows of magnetic bars, two metal plates and a clamping frame. The diaphragm is clamped in the clamping frame and is positioned between the two rows of magnetic bars. Each row o... | 10/26/2004 |
| 6681025 | Electromechanical and electroacoustic transducer An electromechanical and electroacoustic transducer is compact and has a simple drive circuit. Two independent magnetic circuits share a single permanent magnet. A voice coil is placed in one of the magnetic circuits, and a magnetic weight is placed in th... | 01/20/2004 |
| 6636611 | Combined receiver and speaker Disclosed herein is a combined receiver and speaker. The combined receiver and speaker has a diaphragm, a voice coil, and a chip resistor. The diaphragm generates sounds of a predetermined frequency through vibrations caused by a sound pressure in speaker... | 10/21/2003 |
| 6608541 | Electromagnetic actuator An electromagnetic actuator comprises: a magnet; a pole piece mounted to the magnet; a yoke facing the pole piece; a coil base having a vibration coil; leaf springs for supporting the coil base and a weight; a case for enclosing them; a cover for covering... | 08/19/2003 |
| 6584206 | Speaker apparatus A fixed electrode is divided into a plurality of electrode pieces and driving signals of different voltages are applied to the electrode pieces such that a distribution of driving forces applied to a vibrator is proportional to the surface displacement di... | 06/24/2003 |
| 6542617 | Speaker In a speaker which is constructed in a manner that a voice coil bobbin is attached to an inner circumferential portion of a cone type diaphragm while a voice coil is wound around the voice coil bobbin, and the voice coil is inserted into a magnetic gap, t... | 04/01/2003 |
| 6359996 | Speaker device A speaker apparatus has a magnetic circuit portion, a diaphragm, a secondary coil, at least one primary coil, a cylindrical member, and a positioning portion. The magnetic circuit portion has a magnet, a yoke for which the magnet is provided, and a top pl... | 03/19/2002 |
| 6259799 | Speaker system A speaker system includes a plurality of double-voice-coil speaker units fitted to a closed type cabinet and connected in parallel with each other so that first voice coils are connected to each other at the same polarities, and second voice coils are con... | 07/10/2001 |
| 6188775 | Panel-form loudspeakers A panel-form loudspeaker has two distributed mode acoustic radiators coupled by a resilient suspension. Each radiator has its own transducer.... | 02/13/2001 |
| 5148493 | Loudspeaker structure A dipole loudspeaker includes a rigid support containing an opening and a generally planar multi-layered flexible diaphragm mounted on the support and extending across the opening. The diaphragm is formed of a plurality of layers of thin flexible membrane... | 09/15/1992 |
| 4897877 | Sub-woofer driver combination with dual voice coil arrangement A high-fidelity stereophonic automobile audio system has a rear speaker for each channel with a coaxial dual voice coil structure. One voice coil is optimized for full-range reproduction and is driven directly from a rear channel output of the vehicle rad... | 01/30/1990 |
| 4783824 | Speaker unit having two voice coils wound around a common coil bobbin A speaker unit having a pair of voice coils each wound around a common coil bobbin and a first magnet for driving one coil of the pair of voice coils. A second magnet is provided for suppressing flux leakage of the first magnet and driving one coil of the... | 11/08/1988 |
| 4727586 | High fidelity speaker system and assembly A speaker system and assembly achieves a high fidelity sound reproduction by causing acoustical waves emanating from juxtaposed and co-axially positioned first and second speakers, which produce respective mid-range and treble frequencies, to reach a list... | 02/23/1988 |
| 4590333 | Multidriver loudspeaker An improved multidriver loudspeaker includes a low frequency driver having an elongated voice coil former terminating in an inverted speaker cone and a high frequency driver located along the voice coil former. The voice coil former is formed such that th... | 05/20/1986 |
| 4586192 | Soundstage boundary expansion system A system for providing the effect of an extended soundstage comprises a pair of stereophonic loudspeakers, each having a movable or vibrational element driven by a pair of voice coils including a principal or main voice coil and an auxiliary or enhancemen... | 04/29/1986 |
| 4468530 | Loudspeaker system One aspect of the invention is an integrated induction speaker which produces coherent high frequency and low frequency output. In this embodiment, the high frequency unit is centered between the two split halves of the low frequency unit. Another aspect ... | 08/28/1984 |
| 4151379 | Electromagnetic speaker with bucking parallel high and low frequency coils drives sounding board and second diaphragm or external apparatus via magnetic coupling and having adjustable air gap and slot pole piece An electro-acoustic transducer having a bass and treble coil wound on a single magnetizable core positioned to activate a magnetizable armature at one end of the core and to supply magnetic energy at the other end of the core for the operation of other en... | 04/24/1979 |
| 4130725 | Split-coil speaker with direct coupling A high-efficiency loudspeaker with a split voice coil and directly coupled push-pull audio amplifier circuit, especially useful when energized through a single-ended, low voltage, external power source to increase the output of a relatively low-power audi... | 12/19/1978 |
