Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 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 |
| 7283637 | Exciting device An exciting device capable of producing sound by sound-producing vibration body of a main body of an apparatus is provided. An exciting member 32A thin and long in the direction X is provided on a vibration substrate 31 thin and long in the direction X... | 10/16/2007 |
| 7263199 | Microphone assembly An electromagnetic transducer is described including a magnet assembly (50) and a conductive drive coil (52). The magnet assembly provides an emanating magnetic field within which the drive coil is located. The drive coil is a flat ring coil having a w... | 08/28/2007 |
| 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 |
| 7103195 | Speaker unit There is provided a speaker unit comprising: an elliptical vibrating diaphragm; a cylindrical voice coil secured at one end thereof on the center of the elliptical vibrating diaphragm; a frame structure for movably supporting the vibrating diaphragm, said frame stru... | 09/05/2006 |
| 7068807 | Speaker device To realize a speaker device capable of significantly improving sound quality with a simple construction. The speaker device applies electromagnetic force to a voice coil based on a supplied audio signal, and generates a sound wave according to the audio signal by vi... | 06/27/2006 |
| 7058195 | Speaker assembly An electromagnetic transducer is described including a magnet assembly (50) and a conductive drive coil (52). The magnet assembly provides an emanating magnetic field within which the drive coil is located. The drive coil is a flat ring coil having a w... | 06/06/2006 |
| 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 |
| 6671385 | Speaker and magnetic circuit used for the speaker A loudspeaker includes a magnetic circuit comprising a center plate, first and second magnets disposed respectively on a lower surface and an upper surface of the center plate and magnetized to be repulsive to each other, an under plate disposed at a lowe... | 12/30/2003 |
| 6600399 | Transducer motor/generator assembly An electromagnetic transducer is described including a magnet assembly and a conductive drive coil. The magnet assembly provides an emanating magnetic field within which the drive coil is located. The drive coil is a flat ring coil having a width that is ... | 07/29/2003 |
| 6473515 | Cap and center pole apparatus and method of coupling The present invention comprises an improved center pole having a distortion reduction cap and an improved method of coupling the cap to a speaker center pole. The speaker assembly comprises a distortion reduction cap and a cylindrical center pole having a... | 10/29/2002 |
| 6289106 | Cap and center pole apparatus and method of coupling The present invention consists of an improved distortion reduction cap and center pole speaker assembly and an improved method of coupling the cap to a speaker center pole. The cap includes an axial flare which is stretched over and pressed into a corresp... | 09/11/2001 |
| 5841880 | Multi-point drive type speaker A light and cost effective speaker is provided which is suitable for a vehicle mount speaker, thin, and has a broad reproduction frequency band. Like a cone diaphragm and a center cap or the like, the cone diaphragm having a valley at the junction point w... | 11/24/1998 |
| 5461677 | Loudspeaker A loudspeaker including one or more secondary magnets positioned proximate to an opening of a gap through which a voice coil moves, to capture escaping ferrofluid and return the fluid to the gap. The secondary magnets have axial poles and are oriented, re... | 10/24/1995 |
| 5452366 | Loudspeaker A loudspeaker having a repulsion magnetic circuit capable of suppressing negative magnetic fluxes. The loudspeaker has magnets with the same poles being faced each other and an outer magnet magnetized in a direction different from the counter magnets is d... | 09/19/1995 |
| 5371806 | Loudspeaker A loudspeaker has two magnets disposed directly with respect to voice coils for generating a repulsion magnetic field at the voice coils, without interposition of yoke but with mutually repulsing magnetic polarities of the magnets, and a diaphragm directl... | 12/06/1994 |
| 5214710 | Permanent magnet system with associated coil arrangement The invention relates to a permanent magnet system with associated coil arrangement, the permanent magnet system consisting of two axially polarized permanent magnet rings which are mounted one behind another in the axial direction, like poles of the perm... | 05/25/1993 |
| 5070530 | Electroacoustic transducers with increased magnetic stability for distortion reduction A loudspeaker includes a radially slotted ceramic permanent magnet for reducing distortion. Other constructions include slotted top and bottom plates and radially slotted bucking magnets, in combination with slotted magnet loudspeakers. The slotted buckin... | 12/03/1991 |
| 4868882 | Loudspeaker A loudspeaker is disclosed with a diaphragm and an annular moving coil fastened to the diaphragm. An annular permanent-magnet system is arranged concentrically relative to the moving coil and is fastened to a support. To obtain a high-power and extremely ... | 09/19/1989 |
| 4860370 | Magnetically suspended acoustical speaker The diaphragm of an acoustic loudspeaker is suspended by means of the force of a magnetic field applied along a gravitational load axis to avoid direct or indirect physical contact with the support during drive of the diaphragm by an electrical signal. Di... | 08/22/1989 |
| 4654486 | Poor-scatter pot magnet system for magnetic-dynamic loudspeakers or acoustic transducers A poor-scatter pot magnet system for magnetic-dynamic loudspeakers or acoustic transducers in which two permanent magnets, of which at least the upper one is a magnet ring. A pole core, an upper, perforated plate and a lower pole plate are built into an i... | 03/31/1987 |
| 4492827 | Horn speaker with reduced magnetic flux leakage By adding a secondary magnetic piece with a partially open magnetic circuit to the front surface of a yoke connected to a primary magnetic piece, the magnetic flux leakage from the main magnetic piece is reduced on one hand and the magnetic flux extending... | 01/08/1985 |
| 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 |
| 4465906 | Low-leakage pot magnet system for moving-coil loudspeakers A low-leakage pot magnet system for moving-coil loudspeakers having two permanent magnets of opposite polarity is accomplished by spacing the lower permanent magnet away from the bottom of the screen pot by an appropriate support which includes a disk or ... | 08/14/1984 |
