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8670292 Electromagnetic linear actuators for marine acoustic vibratory sources  
Disclosed are electromagnetic linear actuators used in acoustic vibratory sources for marine seismic surveying. An embodiment discloses a linear actuator for acoustic sources, comprising: magnetic...
8446798 Marine acoustic vibrator having enhanced low-frequency amplitude  
A seismic source includes a flextensional shell defining a longer axis and a shorter axis and at least one driver coupled to the flextensional shell proximate an end of the shorter axis. The...
8427906 Acoustic sensor utilizing acoustoelectric effect  
An ultrasound system that detects a characteristic of an ultrasound wave. The system includes a circuit member defining a sensing portion operable to be exposed to the ultrasound wave. The system...
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...
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...
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...
RE36512 Method of fabricating 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...
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...
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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
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....
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...
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...
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...
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)...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
5174280 Shockwave source  
A shockwave source and generating device includes a ring shaped or cylindrical wave generator having a central axis for radiating shockwaves in an axial direction or radially towards a parabolic...
5165388 Electrodynamic shockwave generator with a superconducting coil arrangement  
An electrodynamic shockwave generator, of the type having a shockwave source formed by an electrically conductive membrane and an electrically driven coil, with the membrane being rapidly repulsed...
5137014 Coil for lithotripter  
A lithotripter for the contactless comminution of concrements in living beings includes a flat coil cooperating with a juxtaposed membrane which upon energization of the coil produces shockwaves...
5126979 Variable reluctance actuated flextension transducer  
An underwater acoustic projector including a Class IV flextension shell, preferably in the form of an ellipsoid, is connected to and driven by two substantially identical electromagnets having...
5117403 Above and below water sound transducer  
A noise cancelling watertight transducer that converts sound wave to electromagnetic waves or conversely electromagnetic waves to sound waves comprises a hollow shell having curved walls mounted...
4924858 Electromagnetic shockwave generator transducer  
A transducer to be used in a shock wave generator including a support, at least one energizing coil mounted on the support; at least one, preferably two copper or silver membranes are placed on...
4920955 Shock wave source  
A shock wave source of the type suitable for disintegrating calculi in the body of a patient has a shock wave tube which is filled with a shock wave conducting medium, such as a liquid, which is...
4901709 Shock wave source  
A shock wave source for use in a shock wave generator in an apparatus for extracorporeal lithotripsy treatment of a patient has a shock wave tube filled with a shock wave propagating medium with...
4875199 Deep water transient sound generator  
This invention relates to an underwater transient sound generator capable of operating at substantial depths. The pulse produced by the generator is used to determine subbottom terrain in...
4868799 Means for equalizing the internal pressure in an underwater transducer employing a vibratile piston to permit operation of the transducer at water depths in excess of a few hundred feet  
A deep-water low-frequency transducer employs a collapsible air chamber to equalize the internal transducer air pressure with the external hydrostatic pressure at the submerged operating depth. A...
4821245 Electromagnetic transducer  
An electromagnetic transducer for use in generating transient acoustic pulses in particular for medical purposes such as the destruction of kidney stones. The transducer comprises at least one...
4796724 Process and devices for producing pressure - or shear-waves in a solid medium  
A system for producing pressure or shear-waves in a solid medium uses a wave generator with at least one primary induction coil and at least one short-circuited secondary coil. The short-circuited...
4794914 Shock wave generator for an apparatus for non-contacting disintegration of calculi in the body of a life form  
The invention is directed to a shock wave generator for an apparatus for non-contacting disintegration of calculi in the body of a life form which includes a housing filled with a liquid, a...
4782821 Shock wave generator for an installation for non-contacting disintegration of calculi in the body of a life form  
A shock wave generator for an installation for non-contacting disintegration of calculi in the body of a life form has a coil with spirally arranged turns and a membrane formed of an electrically...
4766888 Shock wave generator for an apparatus for non-contacting disintegration of calculi in the body of a life form  
A shock wave generator for an apparatus for non-contacting disintegration of calculi in the body of a life form has a membrane of electrically conductive material which terminates a volume filled...
4763307 Wide-range audio frequency underwater transducer  
A wide-range audio frequency underwater transducer is designed to make use of a massive small diameter vibratile piston driven by electromagnetic oscillatory forces to transmit omnidirectional...

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