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Class 367/168 - Magnetostrictive


Subclass of Class 367 - Communications, electrical: acoustic wave systems and devices
Definition: Subject matter wherein the acoustic wave energy causes or
No. of patents: 57
Last issue date: 02/01/2011


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NumberTitleIssue Date
7881158Seismic vibrator having multiple resonant frequencies in the seismic frequency band using multiple spring and mass arrangements to reduce required reactive mass
A seismic vibrator includes a transducer, a reactive mass, a base plate to couple motion of the reactive mass to subsurface formations and a linkage system configured to couple motion of the transducer to the reactive mass and the base plate. The linkage system coop...
02/01/2011
7697375Combined electro-magnetic acoustic transducer
A combined electromagnetic acoustic transducer (EMAT) is disclosed adapted to generate both SH-type acoustic waves and LAMB-type acoustic waves in a conductive casing, surroundings of which are to be analyzed. The transducer comprises one magnet assembly and two RF ...
04/13/2010
7551518Driving means for acoustic marine vibrator
A marine vibrator that in a particular embodiment includes a substantially elliptically shaped outer shell, a driver having a first and second end, at least one outer spring connected between the first end and the second end of the driver, and at least one inner spr...
06/23/2009
7289633System and method for integral transference of acoustical events
A sound system for capturing and reproducing sounds produced by a plurality of sound sources. The system comprises a device for receiving sounds produced by the plurality of sound sources and converting the separately received sounds to a plurality of separate audio...
10/30/2007
7235910Selective etching process for cutting amorphous metal shapes and components made thereof
A selective etching process cuts shapes from amorphous metal strip feedstock. The etching process comprises depositing a chemically resistant material to one side of the strip in a pattern that defines the requisite shape, mating the metal strip with a carrier strip...
06/26/2007
7207397Multi-pole transmitter source
Methods and apparatus facilitating logging-while-drilling (LWD) using a multi-pole acoustic transmitter source. The multi-pole transmitter source enables measurement of formation velocities, including shear wave velocities through formations that are slower than vel...
04/24/2007
7165453Flexible electromagnetic acoustic transducer sensor
An array of magnets designed of flexible components and materials can be easily shaped to fit to the contour of various curved surfaces and structures. EMATs that incorporate these magnets, in addition to being flexible, may be smaller in volume than the conventiona...
01/23/2007
7144468Method of constructing a unitary amorphous metal component for an electric machine
A unitary amorphous metal magnetic component for an axial flux electric machine such as a motor or generator is formed from a spirally wound annular cylinder of ferromagnetic amorphous metal strips. The cylinder is adhesively bonded and provided with a plurality of ...
12/05/2006
7138576Sound system and method for creating a sound event based on a modeled sound field
A sound system and method for modeling a sound field generated by a sound source and creating a sound event based on the modeled sound field is disclosed. The system and method captures a sound field over an enclosing surface, models the sound field and enables repr...
11/21/2006
7111399Undercutter for a shaving apparatus
A method of shaving with a shaving apparatus including an undercutter assembly having a primary undercutter and a secondary undercutter, the primary and secondary undercutters having interleaved blade elements. The method includes the steps of: reciprocally moving t...
09/26/2006
7065877Undercutter for a shaving apparatus
An undercutter assembly for a shaver of the dry-type having an outer cutter and a motor drive mechanism. The undercutter includes a primary undercutter adapted to be reciprocated by the drive mechanism and having primary blade elements, and a secondary undercutter d...
06/27/2006
6930438Multilayer electrical component having a passivation layer
A piezoelectric component has a multilayer structure. The piezoelectric component includes piezoelectric ceramic layers, electrode layers arranged among the ceramic layers in a stack such that the electrode layers and the piezoelectric ceramic layers alternate in th...
08/16/2005
6919669Electro-active device using radial electric field piezo-diaphragm for sonic applications
An electro-active transducer for sonic applications includes a ferroelectric material sandwiched by first and second electrode patterns to form a piezo-diaphragm coupled to a mounting frame. When the device is used as a sonic actuator, the first and second electrode...
07/19/2005
6600962Sensor controller
A control system for controlling a variable of a device by an end element is disclosed. The control system has as its input a magnetostrictive position sensing probe for measuring the value of the variable of the device at time intervals and a digital con...
07/29/2003
6188313Device for generating sound
A device for regenerating powerful acoustic pressure comprises at least an arrangement for generating sound while utilizing the flextensional technique, i.e. having at least one surface element (2), the opposite ends (4, 5) of which are arranged to be inf...
02/13/2001
6076629Low frequency flextensional acoustic source for underwater use
There is provided an acoustic source especially for use in seismic studies at sea. The acoustic source has a longitudinal axis and sound emitting surfaces adapted to be put into sound emitting movements towards and away from each other by use of a drive u...
06/20/2000
5812496Water resistant microphone
A microphone for use in underwater applications. The microphone includes a dynamic magnet and coil assembly in a housing which incorporates a hydrophobic membrane. The membrane is sufficiently porous to permit air to pass therethrough. However, water cann...
09/22/1998
5615172Autonomous data transmission apparatus
A autonomous borehole data transmission apparatus for transmitting measurement data from measuring instruments at the downhole end of a drill string by generating pressure pulses utilizing a transducer longitudinally responsive to magnetic field pulses ca...
03/25/1997
5568448System for transmitting a signal
A magnetostrictive element generates an ultrasonic wave and the generated ultrasonic wave is propagated through a propagation medium. An acoustic wave receiver receives the propagated ultrasonic wave at the other end of the propagation medium and converts...
10/22/1996
5550792Sliced phased array doppler sonar system
A method and apparatus is disclosed for making a sliced phased array transducer formed from a single piezoelectric disk which has been bonded to a metal coated support surface. After bonding, the disk and attached metallic coating are cut into a plurality...
08/27/1996
5414397Clamping device for magnetostrictive bodies
The invention relates to an elastic clamping device for at least one body with magnetostrictive properties, wherein a pressure force presses the clamping device against the inner magnetostrictive body with a predetermined force. The pressure force extends...
05/09/1995
5357232Magnetostrictive element
A magnetostrictive element includes a magnetostrictive member, an outer magnet disposed coaxially about, spaced apart from, and surrounding the magnetostrictive member, and a soft magnetic yoke for magnetically coupling the magnetostrictive member and the...
10/18/1994
5355351Underwater low-frequency sound producer using a rare earth alloy
An underwater low-frequency sound producer comprises vibrator units each including a magnetostrictive rod formed of a rare-earth alloy, a permanent magnet for providing a magnetic bias to the rod, prestress bolts for prestressing the rod, a coil wound on ...
10/11/1994
5329499Acoustic transmitter
A drive package for acoustic transmitters includes a frame (6) of magnetic material with windows for accommodating driving members (20) and prestress devices (22) . Two windows with driving members and an intermediate window with a prestress device form a...
07/12/1994
5132942Low frequency electroacoustic transducer
This invention concerns a low frequency, high energy output electroacoustic transducer. It utilizes a vibratory unit formed of a stack of hollow ceramic cylinders about which is fitted a resilient metal sleeve. The metal sleeve is tensioned outwardly duri...
07/21/1992
5103483Spherical membrane omnidirectional loudspeaker using a magnetostrictive bimetallic strip
The invention concerns an omnidirectional loudspeaker. This loudspeaker comprises a spherical membrane which includes spires formed of a strip (2) made of a magnetostrictive material, the spires being spiral wound according to a sphere; these spires are k...
04/07/1992
5101384Acoustic devices
A driving member for a diaphragm in acoustic devices includes a body with opposite recesses into which driving rods are inserted. One end of the driving rods is attached to pressure rods which directly influence the diaphragm and the other end of the driv...
03/31/1992
5070486Process to increase the power of the low frequency electro acoustic transducers and corresponding transducers
An electroacoustic transducer according to the invention comprises a stacking of annular plates (13) made of piezoelectric ceramics alternating with annular electrodes (14) and pressed by an axial prestressing stem (15). The contact faces between each pla...
12/03/1991
5020036Magnetostrictive transducer for logging tool
An acoustic wellbore logging tool transducer formed of a composite plate member having at least one plate of a magnetostrictive material which responds to a magnetic field to elongate or contract to effect displacement of said plate member within a cavity...
05/28/1991
4965778Helical magnetostrictive core line hydrophone
A magnetostrictive flexible line hydrophone having a magnetostrictive elet which is an annealed nickel strip within a toroidal winding. Electrical wires are disposed inside the cylinder formed by the nickel strip and abut a pressure release material abou...
10/23/1990
4907209Low frequency sound transducer
A low frequency sound producer including a plurality of magnetostrictive vibrators arranged seriatim end to end to define a ring. Each vibrator unit includes a plurality of laterally related magnetostrictive rods which, in the illustrated embodiment, are ...
03/06/1990
4901293Rare earth flextensional transducer
A flextensional transducer driven by magnetically biased rare earth rods 31. The rods 31 are arranged in stacks with rare earth magnets 34 mounted on each end of each stack for providing the bias field. The rods 31 are slotted to reduce eddy currents and ...
02/13/1990
4866682Transducer device
The present invention is directed to an ultrasonic device comprising a plurality of transducer elements arranged in rows and columns and acoustic insulation material maintained between each two adjacent rows of transducer elements. The ultrasonic device c...
09/12/1989
4864548Flextensional transducer
An acoustic transducer for providing large displacements particularly at low acoustic frequencies is formed from a minimum of three curved shells which are attached to each other at their ends. The shells are driven by a ring or corresponding number of at...
09/05/1989
4862430Wide pass band elastic wave omnidirectional transducer
Wide pass band elastic wave omnidirectional transducer. It comprises a magnetostrictive material membrane (34, 36) provided with two electrical connections at two diametrically opposite points. The potential difference between these connections is proportional...
08/29/1989
4845688Electro-mechanical transduction apparatus
An electro-mechanical spring which provides amplified motion as well as a compliant structure for attachment, at the locations of maximum motion, to other mechanical or acoustical loads or elements. The spring produces motion in a directional orthogonal t...
07/04/1989
4782471Omnidirectional transducer of elastic waves with a wide pass band and production process
Omnidirectional, wide pass band, elastic wave transducer comprising a rigid magnetostrictive diaphragm, each surface element of the diaphragm constituting a unidirectional elastic wave transducer in its normal direction, and an electric control means prov...
11/01/1988
4754441Directional flextensional transducer
A directional flextensional transducer including a transducer shell capable of operation in odd and even drive modes and a transduction drive bar or the like. The transduction drive bar is excited in an even mode to impart extensional motion thereto and i...
06/28/1988
4742499Flextensional transducer
An acoustic transducer for providing large displacements particularly at low acoustic frequencies is formed from a minimum of three curved shells which are attached to each other at their ends. The shells are driven by a ring or corresponding number of at...
05/03/1988
4716556Magnetostrictive acoustic transducer
An acoustic transducer is provided that uses a layer of magnetostrictive ferromagnetic material having high magneto-mechanical coupling. The ferromagnetic material is adhered to a part of the outer surface of a resilient rod, so that an incident acoustic ...
12/29/1987
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