Class 381/177 - Dynamic (e.g., magnetic)

Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter including a diaphragm to which a current
No. of patents: 26
Last issue date: 09/27/2011

Number	Title	Issue Date
8027492	Armature for a receiver An armature for a receiver comprising a first and a second leg portion each having a thickness and a width and connected to each other, and a connection portion in communication with the first and second leg portions. The connection portion has a width greater than ...	09/27/2011
7869610	Balanced armature bone conduction shaker A bone conduction transducer suitable for use in a listening device, such as hearing aids, in-ear monitors, headphones, electronic hearing protection devices, and very small scale acoustic speakers, has an end mass assembly disposed within the housing. The end mass ...	01/11/2011
7561705	Reduction of flux leakage in a dynamic microphone Leakage flux is reduced particularly in a magnetic gap of a magnetic circuit to improve the sensitivity of a dynamic microphone. A dynamic microphone including a magnetic circuit unit 20 including a center pole piece 22 connected to one pole of a first...	07/14/2009
7433478	Microphone pick-up device A microphone pick-up device includes an air chamber unit disposed posteriorly of an annular cap body. A pick-up unit generates an acoustic signal in response to detected sound, and includes a yoke mounted in a front portion of the cap body, a voice coil disposed aro...	10/07/2008
7412066	Microphone A sound recording and/or sound reproducing part loosely anchored/connected to a second part wherein the sound recording and/or sound reproducing part is levitated on a magnetic field. The sound recording and/or sound reproducing part and the second part in combinati...	08/12/2008
7310539	Portable communication device with plural olfactory cuing A portable communication device includes a body (11) having a container (111) and a buffer room (115), and a plurality of fragrance releasing apparatuses (12) housed in the container. The body houses main circuitry therein. The buffer roo...	12/18/2007
7239712	Inductor-based MEMS microphone An inductor-based integrated MEMS microphone and a method of making the microphone is provided. The microphone structure includes a vibrating inductor that is suspended over another stationary inductor such that the magnetic field induced from one inductor induces a...	07/03/2007
7152481	Capacitive micromachined acoustic transducer A micromachined capacitive acoustic transducer including an electrode formed by a perforated plate and another electrode formed by a shallowly corrugated membrane anchored at one or more positions on the substrate which also supports the said perforated plate is des...	12/26/2006
7079663	Microphone A microphone comprising a diaphragm which has a front diaphragm surface on which sound waves impinge and a rear diaphragm surface which is at least partially acoustically separated from the front diaphragm surface, and a sound inlet, through which sound waves can go...	07/18/2006
6832518	Pressure wave sensor using levitated mass A mass is levitated with respect to a base, at least one of which is comprised of a diamagnetic material, with the levitated mass also having a permanent magnetic property. A second permanent magnet is optionally configured such that it attracts the levitation mass ...	12/21/2004
6091828	Dynamic microphone A vibration detecting unit is arranged in an air chamber in communication with a microphone unit and changes in pressure in the air chamber caused by the vibrations of a diaphragm of the vibration detecting unit is transmitted to the back surface side of ...	07/18/2000
6075866	Electroacoustic transducer having axially extending corrugated supporting means for the diaphragm In an electroacoustic transducer (1) having a diaphragm (19) and having a supporting means (25) for the diaphragm (19) the diaphragm (19) and the supporting structure (25) form a single part, and an annular outer zone (24) of the diaphragm (19) and a firs...	06/13/2000
5995637	Assembly housing for electroacoustical transducer An assembly housing for accepting an electroacoustical transducer having a rear face with terminal pins proceeding therefrom, contact surfaces thereon, and at least one sound admission opening, is formed by an acceptor plate which is disposed adjacent the...	11/30/1999
5673330	Microphone transducer with noise reducing member A microphone transducer includes a magnet, a yoke disposed around the magnet, an inner insulator provided between the magnet and the yoke, an outer insulator provided around the yoke, a voice coil provided around an upper portion of the magnet, and a diap...	09/30/1997
5263093	Microphone device in use in for communication apparatus for motorcycle In a close talking microphone device in use for a communication apparatus for a motorcycle, a front casing 2 and a back casing 3 are provided with a front opening 7 and a back opening respectively. Elastic supporting members 5, 6 and 15 for a microphone 4...	11/16/1993
5255328	Dynamic microphone The invention relates to a supporting structure of a diaphragm of a dynamic microphone. A viscous liquid is filled in the inside of the peripheral edge portion of the edge portion of the diaphragm, thereby supporting the diaphragm to the casing through th...	10/19/1993
5148492	Diaphragm of dynamic microphone There is a dynamic microphone comprising: a diaphragm which can vibrate by an acoustic wave and a voice coil which is joined to the diaphragm so as to transverse a magnetic field formed by the magnet and can vibrate integratedly with the diaphragm, wherei...	09/15/1992
5033093	Compact microphone and method of manufacture A microphone has a diaphragm having a dome central portion being formed of laminate of a thin layer of synthetic resinous material and a thin wire mesh contacting the central portion. As surrounding attachment portion is provided so that the diaphragm is ...	07/16/1991
4858719	Pressure gradient pickup A pressure gradient pickup, particularly a capacitor microphone or a dynamic microphone, has a diaphragm arranged in a housing and at least one sound entry opening which conducts the sound to the rear side of the diaphragm. Acoustically acting phase-shift...	08/22/1989
4840183	Electrocardiograph A displacement sensor for an electrocardiograph attaches a permanent magnet chip directly on a living body, and movement or vibration of the living body is sensed by measuring flux by said magnet. The electrocardiograph has a magnet assembly having an adh...	06/20/1989
4817165	Acoustic speaker device with a diaphragm having a spider web type core A dome-shaped acoustic motor diaphragm having a core of aluminum foil in the form of a spider web configuration resulting in the dome shape, the diaphragm being in the form of an annular semi-dome outer diaphragm part and a dome-shaped cylindrical inner d...	03/28/1989
4765321	Displacement sensor for a living body A displacement sensor for a living body provides an improved stethoscope and/or cardiogram. The apparatus has a diaphragm which is placed on the surface of a living body, a permanent magnet located on the diaphragm, an inductor arrangement located adjacen...	08/23/1988
4410770	Directional microphone A unidirectional dynamic microphone provided with a first sound path to the forward side of the diaphragm and a second sound path to the rear side of the diaphragm in which the second sound path has a chamber coupled to a second chamber associated with th...	10/18/1983
4340787	Electroacoustic transducer An electroacoustic transducer of the electrodynamic type comprises a flat magnetic system permeable to sound including a diaphragm with conducting tracks which are disposed within the system which has a mass provided with conducting tracks substantially e...	07/20/1982
3989905	Microphone The disclosure describes improved apparatus for adjusting a unidirectional microphone in order to reduce the electrical output due to mechanical shocks applied to the microphone casing. The microphone includes a diaphragm supported by a housing which is r...	11/02/1976
3940575	Directional microphone A pressure gradient directional microphone of the moving coil type in which the acousto-mechanical function of the transducer is achieved by a vibratile diaphragm the major area of which is of coneiform shape and the central portion of which is of dome sh...	02/24/1976

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Class 381/177 - Dynamic (e.g., magnetic)