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| Number | Title | Issue Date |
| 7260229 | Position sensor for a loudspeaker The invention relates to an improved electro-dynamic loudspeaker. The electro-dynamic loudspeaker comprises (a) a voice coil for generating an acoustic waveform, the voice coil being longitudinally movable from an initial rest position to generate the acoustic wavef... | 08/21/2007 |
| 7236609 | Electro-acoustic transducer with resistance to shock-waves A transducer comprising a pair of spaced magnets at least partially forming a tunnel having a central axis. A coil having a first and a second side wall and an upper and a lower wall at least partially forms the tunnel. A reed having a central portion extends throug... | 06/26/2007 |
| 7180489 | Automated multi-task window assembly A window assembly includes a window frame defining a frame perimeter and at least one window mounted in the frame. A media panel incorporating a video display is associated with the window assembly and can be moved selectively into the frame perimeter for displaying... | 02/20/2007 |
| 7164777 | Speaker driver with detachable motor and basket A speaker driver has a detachable motor and basket to allow attachment or separation of the motor assembly from the basket assembly. Two embodiments are disclosed, a thread-on detachable motor and a bolt-on detachable motor. ... | 01/16/2007 |
| 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 |
| 7065224 | Microphone for a hearing aid or listening device with improved internal damping and foreign material protection A microphone and method for dampening the frequency response of the microphone by disposing a dampening frame in a rear volume of the microphone. The microphone generally includes a housing, a diaphragm, a damping frame, and a backplate. The diaphragm rests on embos... | 06/20/2006 |
| 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 |
| 7031489 | Magnetic circuit for speaker with short-circuiting ring A magnetic circuit for a speaker comprises: a bottom yoke including a center pole; a ring magnet; a top plate; and a short-circuiting ring shaped like a hollow cylinder. The short-circuiting ring is disposed close and parallel to a voice coil and attached to the inn... | 04/18/2006 |
| 7031490 | Speaker driver with detachable motor and basket A speaker driver has a detachable motor and basket to allow attachment or separation of the motor assembly from the basket assembly. Two embodiments are disclosed, a thread-on detachable motor and a bolt-on detachable motor. ... | 04/18/2006 |
| 6929091 | Planar diaphragm loudspeaker and related methods A planar diaphragm loudspeaker for use in a suspended ceiling grid and related methods of manufacturing are provided. The loudspeaker includes a rectangular, planar diaphragm of polymer material sized to fill an opening of the ceiling grid. The front surface of the ... | 08/16/2005 |
| 6903474 | Electro-mechanical transducer An apparatus adopting an iron core and an inertial mass is disclosed for exerting high power output by converting a sound signal to vibration so as to stimulate the human hearing organs through the bones. A sound-to-vibration conversion apparatus comprises a housing... | 06/07/2005 |
| 6020805 | Permanent magnet assembly A permanent magnet assembly comprising an essentially tubular magnet element which is radially magnetized, inner and outer members of a magnetic material resting against inner and outer sides, respectively, of the magnet element, and an annular top plate ... | 02/01/2000 |
| 5896076 | Force actuator with dual magnetic operation An electromagnetic active vibration actuator configuration combines two modes of operation to obtain the advantages of long stroke and linearity of voice coil type actuators and high efficiency of dual-gap solenoid type actuators. A coaxial stator shell s... | 04/20/1999 |
| 5883557 | Magnetically latching solenoid apparatus A magnetically latching solenoid apparatus is characterized by a non-magnetic armature carrying a permanent magnet having poles aligned with the throw axis of the device. The poles of the magnet are substantially aligned with corresponding pole pieces and... | 03/16/1999 |
| 5705969 | Actuator An actuator for converting electrical energy into rotary or reciprocating motion comprising a casing filled with an electro-sensitive fluid, the casing having a plurality of electrodes affixed along its inner periphery and including a rotary member which ... | 01/06/1998 |
| 5367277 | Electromagnetic energy converter An electromagnetic energy converter comprises a frame-like magnet core, a closed magnetic path being formed along the sides of the magnetic core, a winding wound around the magnet core and connected to a power supply or a load, an armature conductor havin... | 11/22/1994 |
| 5323133 | Method and apparatus for making electrical connection with a movable member A device for making electrical connection to a reciprocating element, such as to a voice coil of an actuator. An electrical flow path utilizing the helical centering springs as a primary element in conducting current ensures reliable current flow to a rec... | 06/21/1994 |
| 5315471 | Coil current regulator with induced flux compensation in an electromagnetic contactor system The coil holding current of a contactor is regulated to the lesser of two measurements of coil current during each cycle of the full-wave rectified control voltage to compensate for induced flux in the coil generated by load current through the main conta... | 05/24/1994 |
| 5270676 | Method of making elements of a magnetic circuit in a loudspeaker A lower die having a first recess corresponding to one of outer shapes of the element, and an upper die having a second recess are provided. The outer diameter of the upper dies is smaller than the inner diameter of the first recess so that a gap is forme... | 12/14/1993 |
| 5128825 | Electrical contactor with controlled closure characteristic A microprocessor controlled electrical contactor monitors the voltage and peak current produced by a first voltage pulse gated to the coil of the contactor electromagnet and adjusts the conduction angle of the second pulse to deliver a constant amount of ... | 07/07/1992 |
| 4846715 | Postage meter voice coil motor printwheel setting assembly A voice coil motor assembly for a voice coil motor printwheel setting apparatus comprises a plate having the voice coil motor coils mounted thereon. The plate is adapted for attachment to a printed circuit board by pins electrically connected to the voice... | 07/11/1989 |
| 4840178 | Magnet for installation in the middle ear A magnet assembly for location around portions of bones in the middle ear where one portion of the assembly is a magnet and another portion of the assembly is a magnetic material, the portions being hinged to one another so that they are held around the b... | 06/20/1989 |
| 4720761 | Electromagnetic contactor with current regulated electromagnetic coil for holding the contacts closed An electromagnetic contactor is taught which includes a conduction angle controlled triac or similar gated device which is connected in series circuit relationship with the winding of an electromagnetic solenoid or coil which is responsible for closing th... | 01/19/1988 |
| 4720763 | Electromagnetic contactor with control circuit for providing acceleration, coast and grab functions An electromagnetic contactor or controller is taught in which the voltage which is impressed across the electromagnetic armature accelerating coil is compared by a microprocess against a menu of memory stored voltages with related delay angles. The delay ... | 01/19/1988 |
| 4628154 | Annular gap magnet system, particularly for low frequency loudspeakers An annular gap magnet system, in particular for a low frequency loudspeaker (Woofer), in which a coil is movable with a large stroke in the working air gap. A braking air gap provided in the region of the inner or lower pole plate produces a magnetic resi... | 12/09/1986 |
| 4580119 | Anistropic configuration magnet Mono-directional magnetic anisotropy given to a Fe-Cr-Co straight tube by initial heat magnetization is converted into radial magnetic anisotropy by subsequent formation of one or more flange sections through plastic deformation which is perpetuated by fi... | 04/01/1986 |
| 4465906 | Low-leakage pot magnet system for moving-coil loudspeakers A low-leakage pot magnet system for moving-coil loudspeakers having two permanent magnets of opposite polarity is accomplished by spacing the lower permanent magnet away from the bottom of the screen pot by an appropriate support which includes a disk or ... | 08/14/1984 |
| 4427958 | Telephone transducers An acoustic transducer of novel structure suitable for automatic assembly is made by arranging with its wall upwards a generally cup-shaped rear cover having a cylindrical wall out-turned at its upper end and extending from the rim of a base divided along... | 01/24/1984 |
| 4425482 | Ring armature electroacoustic transducer The disclosure relates to a ring armature electroacoustic transducer adapted for use as the receiver for telephone sets and for other purposes. The exemplary embodiment comprises the following elements coaxial about a common vertical axis: (a) a cylindric... | 01/10/1984 |
| 4386332 | Magnetic circuit for dynamic speaker A magnetic circuit for a dynamic speaker which can be manufactured inexpensively without the need of machining. The magnetic circuit includes an annularly-shaped magnet, a pole yoke having a backplate coupled to a first surface of the magnet and a pole yo... | 05/31/1983 |
| 4346318 | Linear motion devices Apparatus for producing linear motion comprising a coil defining an electromagnetic field across a gap; and a permanent magnet disposed within the magnetic field in the gap and arranged to be driven in motion by the magnetic field, the permanent magnet be... | 08/24/1982 |
| 4293741 | Magnet assembly A loudspeaker design for use in transmitting and receiving sound waves is disclosed. The loudspeaker consists of a basket (12) and magnet assembly (14). The magnet assembly consists of a sandwich of front (16) and back (20) plates on either side of a ring... | 10/06/1981 |
| 4289937 | Speaker with fine grain ferromagnetic material on center pole or ring A speaker comprises a voice coil placed in an air gap between a center pole and a plate wherein a specific ferromagnetic material obtained by forming fine crystalline grains is used on at least one of the surfaces of the center pole and the plate which re... | 09/15/1981 |
| 4163962 | Universal impedance power apparatus The subject matter of the present invention is a universal impedance element of electric power transmission and distribution use, having either fixed or controllably variable magnitude. One and the same unit of such element can be made to function as an i... | 08/07/1979 |
| 4035591 | Electroacoustic transducers An electroacoustic transducer includes a permanent annular magnet with a central aperture, with front and back multisided flux plates attached to the annular magnet to complete a magnetic circuit which drives a voice coil and operatively drives a diaphrag... | 07/12/1977 |
| 4015227 | Electromagnetic transducer An electromagnetic transducer in which a D.C. magnetic flux generating section including a permanent magnet and a signal flux generating section including a coil are arranged in spaced relation on opposite sides of a diaphragm to form a balanced type tran... | 03/29/1977 |
| 3971054 | Method and apparatus for magnetizing permanent magnet in magnetic structure The permanent magnet of a magnetic structure is formed of isotropic magnetic material, and is magnetized along the path that the flux follows during use of the magnetic structure to increase the efficiency of the magnetic structure in use. The magnetic st... | 07/20/1976 |
| 3937904 | Moving magnet electroacoustic transducer A transducer device such as a loudspeaker or microphone has a U-shaped core of magnetically permeable material with attached pole pieces defining a gap and a stationary electrical coil around the core. A permanent magnet is positioned for movement through... | 02/10/1976 |
