Did You Know...
...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8131005 | Electrodynamic transducer including a dome with a ferrofluid suspension The invention relates to an electrodynamic transducer (1) with a dome type diaphragm (2), comprising an electrodynamic motor with a coil (6) borne by a mandrel (3) integral with the diaphragm suspended to a yoke (7), the coil being... | 03/06/2012 |
| 8064630 | Audio speaker utilizing an unanchored magnet for primary force generation A speaker apparatus has a container holding a volume of ferrofluid, a permanent magnet suspended in the ferrofluid, and a magnetic excitation apparatus proximate the container. Operation of the excitation apparatus causes movement of the permanent magnet, translated... | 11/22/2011 |
| 8014556 | Speaker system for head protective gear A headgear system enhanced for generating sound has at least one speaker apparatus connected to or integrated into the structure of the headgear system, the speaker apparatus including a magnet suspended in a magnetic fluid, and at least one resonator connected to t... | 09/06/2011 |
| 7729504 | Ferrofluid centered voice coil speaker An audio speaker has a driver unit having a support frame with a central portion forming a magnetic structure defining an annular gap around a central magnetic post, a vibration system having a diaphragm and a voice coil, the voice coil is attached to one side of th... | 06/01/2010 |
| 7471805 | Hearing aid mechanism A hearing aid includes a sound input device, and a speaker, wherein the speaker includes a compartment with magnet suspended in a fluid containing magnetic particles and wherein a coil wrapped around the compartment or in close proximity thereto excites the magnet t... | 12/30/2008 |
| 7403632 | Audio speaker utilizing an unanchored magnet for primary force generation A speaker apparatus has a container holding a volume of ferrofluid, a permanent magnet suspended in the ferrofluid, and a magnetic excitation apparatus proximate the container. Operation of the excitation apparatus causes movement of the permanent magnet, translated... | 07/22/2008 |
| 7386144 | 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 ... | 06/10/2008 |
| 7288860 | Magnetic transducer with ferrofluid end bearings An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between... | 10/30/2007 |
| 7266214 | Audio speaker and method for assembling an audio speaker An audio speaker includes a driver unit having a magnetic pole case defining a radial gap, a vibration system having a diaphragm and a voice coil where the vibration system is fixed to the drive unit and the voice coil is movably mounted into the radial gap, and a r... | 09/04/2007 |
| 7248714 | Micro-speaker and method for assembling a micro-speaker The micro-speaker includes a driver unit having a housing, a magnet disposed within the housing forming a radial gap between the magnet and the circumferential walls of the housing, and a magnetic plate disposed on the magnet, a vibration system having a diaphragm a... | 07/24/2007 |
| 7149323 | Speaker A speaker comprising: a magnetic circuit provided with a through hole, and a recess formed around the through hole for retaining a magnetic fluid. The speaker further comprises a bearing provided in the through hole and a shaft supported by the bearing to be movable... | 12/12/2006 |
| 7148583 | Electrical power generators The present invention provides methods to convert motion into electrical energy. These electrical power generators are made compatible with standard batteries so that they can support operations of existing battery powered portable appliances with no or minimal modi... | 12/12/2006 |
| 7122919 | Fixation framework for ring-shaped permanent magnet A ring-shaped permanent magnet comprising a Nd—Fe—B magnetic material is integrally insert-molded within a distal part of an inner periphery of a cylindrical supporting member. By employing this structure, a coaxial alignment accuracy of the permanent magnet rel... | 10/17/2006 |
| 7072482 | Microphone with improved sound inlet port A microphone comprises a housing defining an inner volume and including a first exterior surface with an aperture leading to the inner volume. The microphone includes a transducing assembly within the housing for converting sound into an electrical signal. A sound i... | 07/04/2006 |
| 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 |
| 6993147 | Low cost broad range loudspeaker and system A loudspeaker has a diaphragm with a voice coil disposed about its perimeter and extending in a gap into which the flux of an annular rare earth magnet is focused. An opening behind the diaphragm communicates through the speaker frame. The voice coil may have two or... | 01/31/2006 |
| 6868167 | Audio speaker and method for assembling an audio speaker The method of assembling a speaker includes disposing a quantity of volatile magnetic fluid containing a pre-determined amount of lubricating oil into a radial gap of a driver unit, aligning a vibration system having a diaphragm and a voice coil to the driver unit s... | 03/15/2005 |
| 6804368 | Micro-speaker and method for assembling a micro-speaker The method of assembling a micro-speaker includes disposing a quantity of volatile magnetic fluid into a radial gap of a driver unit, aligning a vibration system having a diaphragm and a voice coil to the driver unit such that the voice coil is accommodated into the... | 10/12/2004 |
| 6654477 | Receiver and method of construction A receiver for converting electrical energy to acoustical energy, and a method of manufacturing the receiver, are disclosed. The receiver comprises an armature having a peripheral edge, a magnet stack and a weld joint for attaching the armature to the mag... | 11/25/2003 |
| 6654476 | Low cost broad range loudspeaker and system A loudspeaker has a diaphragm with a voice coil disposed about its perimeter and extending in a gap into which the flux of an annular rare earth magnet is focused. An opening behind the diaphragm communicates through the speaker frame. The voice coil may ... | 11/25/2003 |
| 6438250 | Method for making a conductor, or electric circuit balanced in radioelectric interference such as micro-discharge and corresponding conductor or circuit The invention relates to a manufacturing process of an electrical conductor or circuit compensated for radio interferences, including those from the electrical circuit itself. An application of a semi-conductor material (2) of resistivity coefficient allo... | 08/20/2002 |
| 6208743 | Electrodynamic acoustic transducer with magnetic gap sealing An electrodynamic acoustic transducer with a coil which projects into an air gap subject to an electromagnetic field, wherein an acoustic short circuit is prevented. The electrodynamic transducer has a membrane comprising two differently profiled portions... | 03/27/2001 |
| 6041131 | Shock resistant electroacoustic transducer The present invention relates to a hearing aid receiver (10) having a coil (12) with a tunnel (14) therethrough, a magnetic structure (16) having a central magnetic gap (18), an armature (20), and a fluid (30, 32) with a viscosity greater than air to prov... | 03/21/2000 |
| 5894524 | High power tweeter A high power compact tweeter which includes a high energy magnet sandwiched between the base of a yoke and top plate which form the magnetic path, the magnet and top plate being spaced from side walls of the yoke by a predetermined gap. A voice coil is po... | 04/13/1999 |
| 5687248 | Light weight and low magnetic leakage loudspeaker A magnetic circuit applied for loudspeakers includes a cup-shaped yoke, a primary magnet, a surrounding top plate, a first central top plate, and a thin magnet. The cup-shaped yoke includes a bottom part and a ring part. The primary magnet is located with... | 11/11/1997 |
| 5625699 | Speaker device In a speaker device equipped with a crossover network according to the present invention, which is used mainly in an automobile sound reproducing system or the like, a capacitor for the crossover network is accommodated within a pole piece of the speaker ... | 04/29/1997 |
| 5583945 | Speaker with a molded plastic frame including a positioning projection, and a method for manufacturing the same A plastic-molded frame 3 has a bottom-closed cylindrical magnetic circuit holding portion 2 which has a positioning projection 6 provided in a central portion on a bottom surface 2a of the magnetic circuit holding portion 2. A magnetic circuit is incorpor... | 12/10/1996 |
| 5524151 | Electroacoustic transducer having a mask In an electroacoustic transducer (1) having a diaphragm (5), a partition wall (24) situated behind the diaphragm (5) and traversed by partition openings (25, 26, 7, 28 and 29, 30, 31, 32), and a mask (37) arranged adjacent the partition wall and provided ... | 06/04/1996 |
| 5335287 | Loudspeaker utilizing magnetic liquid suspension of the voice coil A loudspeaker is provided with a viscous magnetic fluid suspension for the voice coil, rather than the corrugated disk suspension that is conventionally used. Specially designed vent passages are formed in the magnet assembly, in order to prevent internal... | 08/02/1994 |
| 5216723 | Permanent magnet transducing A transducer includes a core of low reluctance magnetic material formed with a narrow gap. There are first and second coils of conductive material wound on the core adjacent to and on opposite sides of the gap. A permanent magnet in and substantially fill... | 06/01/1993 |
| 4914750 | Sound transducer A sound transducer converts electrical signals into mechanical motion. A transducer comprises a transducer housing including a diaphragm section having an inner concave surface and an outer convex surface. A stem element projects outwardly from the diaphr... | 04/03/1990 |
| 4414437 | Moving coil dynamic transducer In an electromagnetic transducer including a member producing a magnetic field and presenting an air gap traversed by the field, a mass of magnetic liquid extending across the air gap, and a moving coil mounted on a moving coil carrier supported for movem... | 11/08/1983 |
| 4320263 | Dynamic transducer with moving coil in an air gap filled with magnetic liquid A dynamic electroacoustic transducer comprising a magnetic pole case defining a magnetic air gap, a coil movably mounted in the air gap and spaced from the magnetic pole case with magnetic liquid extending between the coil and the case in the air gap. A d... | 03/16/1982 |
| 4303806 | Dynamic electroacoustic transducer having a moving coil in an air gap filled with a magnetic liquid A dynamic electroacoustic transducer includes a moving coil which is arranged in an air gap between a pole piece and a pole plate which is filled with a magnetic liquid. At least the outside of the coil has a smooth surface in contact with the magnetic li... | 12/01/1981 |
| 4017694 | Method for making loudspeaker with magnetic fluid enveloping the voice coil A method for the manufacture of loudspeakers having a ferromagnetic fluid contained in the voice coil magnetic air gap and being confined by the loudspeaker magnet field thereby enveloping the portions of the voice coil that are within the magnetic air ga... | 04/12/1977 |
