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| Number | Title | Issue Date |
| 7355926 | Portable low frequency projector A portable low frequency underwater acoustic projector having two circular diaphragms separated by a spacer ring with a pair of coils and oscillating masses being located in pipes connected to central opening in two diaphragms, the coils driving these masses in oppo... | 04/08/2008 |
| 7217380 | Vibration apparatus and methods of vibration The present invention relates to apparatus and methods of vibration. In particular, the present invention relates to apparatus and methods of vibration for tooling in a structure, such as, for example, a fuselage. In one implementation, the tooling comprises at leas... | 05/15/2007 |
| 7194287 | Electric-mechanical-acoustic-transducer and portable communication device including the same An electric-mechanical-acoustic-transducer includes a diaphragm; a movable section; a driving section for generating a driving force for vibrating the diaphragm and the movable section; and a suppression section for suppressing a sharpness (Q factor) of a vibration ... | 03/20/2007 |
| 7170822 | Laminated piezoelectric transducer and method of manufacturing the same The invention is illustrated as an underwater acoustic transducer comprising an active acoustic element for transducing sound and electrical signals; a front and rear housing element disposed on each side of the active acoustic element to define a corresponding fron... | 01/30/2007 |
| 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 |
| 7079587 | Signal transmitter having voltage booster circuit and method of operating the same In a radio signal transmitter, a microcomputer operates by receiving an output voltage of a battery to sequentially generate a voltage boosting control signal. This voltage boosting control signal has a longer high level period as generated later. The voltage booste... | 07/18/2006 |
| 6969265 | Electrically connecting integrated circuits and transducers Apparatus and methods of electrically connecting integrated circuits and transducers are described. In particular, a transducer includes a base mountable on a substrate (e.g., a printed circuit board), and an input/output (I/O) lead configured to contact an I/O lead... | 11/29/2005 |
| 6931140 | Electro-acoustic transducer with two diaphragms The present invention relates to an electro-acoustic transducer suitable for applications within mobile communication equipment and hearing aids. The transducer comprises two diaphragms positioned on opposite sides of a magnetic circuit having two magnetic gaps. Whe... | 08/16/2005 |
| 6771565 | Low voltage seismic sound source A boomer for generating acoustic signals in a marine seismic survey has a frame towed by a survey vessel. A coil is mounted to the frame and a conductive plate is adjacent to the coil. A capacitor is mounted to the frame, and control electronics system delivers an e... | 08/03/2004 |
| 6483778 | Systems and methods for passively compensating transducers Systems and methods of the invention can equalize the pressure between an interior cavity and an environment exterior to the interior cavity, while providing for acoustic isolation between the two environments so that acoustic energy propagating through o... | 11/19/2002 |
| 6009047 | Sound generation device A sound generating device for generating a sound wave in a body of water is provided. The device includes a pair of axially aligned pistons. An electromagnet is mounted on at least one of the pistons. Activation of the electromagnet causes the pistons to ... | 12/28/1999 |
| 5941838 | Shock wave source based on the electromagnetic principle Shock wave source based on the electromagnetic principle with defined focusing, with an electrically conductive, three-dimensionally curved membrane, with a coil, which is located adjacent thereto and to which current pulses can be admitted. A switchable ... | 08/24/1999 |
| 5912863 | Electro-acoustic transducer An elongated, electrically conductive diaphragm is placed in a strongly magnetic field to produce a linear and an elongated sound source giving a high sound energy. At least two elongated diaphragms are positioned between intermediate and enclosing protec... | 06/15/1999 |
| 5889732 | Sounder A sounder has a first plate 1 that is molded into a lower case. The first plate functions not only as part of a magnetic circuit, but also as a terminal on the outside of the sounder. The first plate has a coil positioned around a center pole on the first... | 03/30/1999 |
| 5675885 | Method of winding a coil for an electroacoustic transducer An automated method for winding a coil of an electroacoustic transducer utilizes a support member that has a frusto-conical projection for receiving an outer pole tip. The frusto-conical configuration assures that, upon completion of a coil winding about ... | 10/14/1997 |
| 5642333 | Electroacoustic transducer and method of winding coil therein The present invention provides an electroacoustic transducer which can increase the winding efficiency of a coil on a pole and allows the automation of a coil winding process. The present invention relates to an electroacoustic transducer for vibrating a ... | 06/24/1997 |
| 5625700 | Method of farbicating an electroacoustic transducer The present invention provides a fabrication method of an electroacoustic transducer capable of simplifying an assembling process on a lead frame and realizing an automatic assembly. The method comprises steps of forming pole piece portions, forming a lea... | 04/29/1997 |
| 5532980 | Vibrational anti-fouling system An anti-fouling system for producing vibrations in an underwater structure to inhibit the attachment of aquatic life forms to the structure. The system includes a controller which drives one or more transducer. The transducer comprises a housing, one end ... | 07/02/1996 |
| 5529572 | Method and apparatus particularly useful for treating osteoporosis A method and apparatus for increasing the density and strength of bone, particularly for preventing or treating osteoporosis, by subjecting the bone to unfocussed compressional shock waves.... | 06/25/1996 |
| 5471437 | Electrodynamic acoustic transducer An electrodynamic transducer has a diaphragm substantially having two parts with different profiles, namely an acoustically active central part and an annular part laterally adjoining the central part and serving for the resilient suspension of the diaphr... | 11/28/1995 |
| 5467323 | Electroacoustic transducer In an electroacoustic transducer, the opening portion of a casing body which contains therein a magnetic driving portion for converting an electric signal into a sound is closed by a casing cap to form a resonance space (resonance chamber) which resonates... | 11/14/1995 |
| 5450373 | Apparatus for transmitting two frequency signals with an acoustic projector An acoustic projector wherein a unitary acoustic resonator produces active sonar signals in more than one frequency band. The double-slotted resonator is coupled to a transducer which is capable of exciting the resonator in two, distinct, volumetric modes... | 09/12/1995 |
| 5432758 | Electroacoustic transducer An electroacoustic transducer having a diaphragm and a magnetic driving portion respectively housed in a housing wherein the magnetic driving portion vibrates the diaphragm magnetically in response to an electric signal. A base member for closing an openi... | 07/11/1995 |
| 5425002 | Acoustic pressure pulse generator An apparatus for generating acoustic pressure pulses in an acoustic medium has a membrane that can be driven which adjoins the acoustic medium and which is driven in an impact-producing manner. The membrane is mechanically pre-stressed so that it returns ... | 06/13/1995 |
| 5416751 | Electroacoustic transducer An electroacoustic transducer converts an electric signal into sound by vibrating a diaphragm magnetically in response to the electric signal input thereto. A movement restricting means for restricting the movement of the diaphragm within an allowable mov... | 05/16/1995 |
| 5375101 | Electromagnetic sonar transmitter apparatus and method utilizing offset frequency drive A sonar transmitter includes a source means for providing an actuation signal to drive an electromagnetic transducer projector without the use of bias magnetization. The invention utilizes an offset actuation frequency technique in which electrical drivin... | 12/20/1994 |
| 5374236 | Electromagnetic pressure pulse source An electromagnetic pressure pulse source for generating focused pressure pulses as an electrically conductive membrane and a coil system which drives the membrane by rapidly displacing the membrane from the coil system. The coil system is formed by an ann... | 12/20/1994 |
| 5351220 | Moving-coil electrodynamic electroacoustical transducer The present invention involves a moving-coil electrodynamic electroacoustical transducer, comprising a disk made of a hard, nonmagnetic material (12), which is superimposed on the diaphragm (11) and has openings for the output of sound, a power-factor-imp... | 09/27/1994 |
| 5350352 | Acoustic pressure pulse generator A pressure pulse generator has a pressure pulse source with a membrane that is rapidly displaceable from an initial position for generating acoustic pressure pulses in an acoustic propagation medium. For returning the membrane to its initial position, the... | 09/27/1994 |
| 5339286 | Composite electroacoustic transducer The composite electroacoustic transducer for reproducing medium and high frequencies comprises a transducer assigned to reproducing midrange frequencies provided with a dome-shaped membrane which extends in an annular shape. A transducer assigned to repro... | 08/16/1994 |
| 5305288 | Variable reluctance acoustic projector A variable reluctance acoustic projector includes a piston structure that provides rigid retention and precise alignment of electromagnetic cores within the projector housing. The piston structure provides a pair of metallic piston blocks having cavities ... | 04/19/1994 |
| 5299176 | Balanced armature transducers with transverse gap An electromechanical transducer having permanent magnet means forming a bias field in a region between poles, and a vibratable armature having a first part in that region. The armature has a second part extending from the first part substantially external... | 03/29/1994 |
| 5269292 | Pressure pulse source having a positive lens with a pressure sensor A pressure pulse source, of the type suitable for generating shockwaves, has a positive lens for focusing the pressure pulses onto a focal zone. The positive lens has an acoustic exit face which has a shape, in a focusing zone, for focusing the pressure p... | 12/14/1993 |
| 5268879 | Electro-acostic transducers A flexural transducer includes a hollow tube that is magnetically driven by a coil/magnet assembly. A magnetic field is provided by passing a current through the coil. The filed passes through an air gap between the coil and the magnet to attract and repe... | 12/07/1993 |
| 5251630 | Pressure pulse generator having an electromagnetic pressure pulse source A pressure pulse generator has an electromagnetic pressure pulse source which includes a coil arrangement for driving an electrically conductive membrane. The coil arrangement is divided into a first annular coil section and a second annular coil section,... | 10/12/1993 |
| 5214620 | Electrically driveable shockwave source An electrically driveable shockwave source for generating acoustic shockwaves of the type suitable for medical therapy, as a coil arrangement and a membrane disposed adjacent the coil arrangement. The membrane and/or the coil arrangement is formed by a mu... | 05/25/1993 |
| 5207215 | Acoustic pressure pulse generator An acoustic pressure pulse generator has an electrodynamic pressure pulse source formed by a membrane and a coil, so that when the membrane is electrodynamically rapidly repelled from the coil, an acoustic pressure pulse is generated in an acoustic propag... | 05/04/1993 |
| 5206839 | Underwater sound source In the underwater sound source disclosed herein, rigid diaphragms are provided at opposed ends of a hollow shell, the periphery of each of the diaphragms being sealed to the shell. Respective spring means operating between the shell and each of the diaphr... | 04/27/1993 |
| 5199005 | Electromagnetic drive assembly for under water sonar transducer A sonar projector having a pair of opposed oscillating pistons driven by an electromagnetic assembly is provided with reduced weight and high power by forming the electromagnetic assembly with a permanent magnet structure consisting of two coaxial longitu... | 03/30/1993 |
| 5191560 | Sound wave generator for therapeutic purposes This invention relates to a sound wave generator with a variable effective aperture angle according to the electromagnetic principle for therapeutic applications and particularly for the contactless smashing of a concrement situated in the body of a livin... | 03/02/1993 |
