| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381414000 | Flux modifying means | 11 |
| 20110135142 | MAGNETIC CIRCUIT AND SPEAKER USING SAME - Disclosed is a magnetic circuit for a speaker. The magnetic circuit includes a yoke defining a bottom and a sidewall extending perpendicularly from the bottom, a magnet mounted on the bottom of the yoke, a pole plate mounted on a top of the magnet. The magnet includes a wider portion mounted on the bottom of the yoke and a narrower portion carrying the pole plate. | 06-09-2011 |
| 20140056468 | MAGNETIC CIRCUIT FOR LOUDSPEAKER AND LOUDSPEAKER USING THE SAME - A magnetic circuit for a loudspeaker includes a magnet and a top plate. The magnet is made of a bonded magnet. The magnet and the top plate are configured to satisfy at least one of conditions that an inner diameter of the magnet is identical to an inner diameter of the top plate, and that an outer diameter of the magnet is identical to an outer diameter of the top plate. This configuration eliminates a wasted space inside the magnetic circuit, and protrusion of the magnet to outside, hence providing a light and efficient magnetic circuit. | 02-27-2014 |
| 20140146995 | ACOUSTIC TRANSDUCER - An acoustic transducer includes a sound-producing member at least partially disposed within the first magnetic flux gap region between the magnetic poles. The sound-producing assemblage is magnetically excited through a magnetic circuit that passes from a location outside the magnetic flux gap region to inside the magnetic flux region through an air gap. The moving member is controllably movable under the influence of at least one varying magnetic field, and its movement is constrained by a unique combination of mechanical restraints and magnetic restraints imposed upon the moving member by the interaction of a plurality of magnetic fields. | 05-29-2014 |
| 20140294228 | LOUDSPEAKER MAGNETIC CIRCUIT AND LOUDSPEAKER USING SAME - A magnetic circuit includes a magnet, a first plate, and a yoke, and has a magnetic gap. The first plate and the yoke are joined to the magnet. The magnet includes first and second magnet parts. The second magnet part has a lower magnetic property than that of the first magnet part. Such a first magnet part is disposed in a vicinity of the magnetic gap. On the other hand, the second magnet part is disposed farther from the magnetic gap than the first magnet part. The first and second magnet parts are connected in parallel to each other. With this configuration, the second magnet part makes a small contribution to the magnetic flux density in the magnetic gap. Therefore, the magnetic property of the second magnet part may be low, and an inexpensive magnet can be used as the second magnet part. | 10-02-2014 |
| 20140314267 | SPEAKER DEVICE WITH A MAGNETIC GAP FILLED WITH MAGNETIC FLUID AND CHANGING MAGNETIC FLUX DENSITY IN AXIAL AND CIRCUMFERENTIAL DIRECTIONS - A speaker device including a magnet formed in a ring shape; a yoke having a center pole portion inserted in the center of the magnet; a plate formed in a ring shape and arranged on the outer circumferential surface of the center pole portion of the yoke while being attached to the magnet; a coil bobbin formed in a cylindrical shape and movable in the axial direction of the center pole portion while being partially fitted on the center pole portion of the yoke; a voice coil wrapped around the outer circumferential surface of the coil bobbin, at least part of the voice coil being arranged in a magnetic gap formed between the plate and the center pole portion of the yoke; a diaphragm having its inner circumferential portion connected to the coil bobbin, the diaphragm being vibrated as the coil bobbin moves; and a magnetic fluid filled in the magnetic gap. | 10-23-2014 |
| 20140363041 | MULTI-WAY COAXIAL LOUDSPEAKER WITH INTERNAL MAGNET MOTOR AND PERMANENT MAGNET CYLINDER - A loudspeaker includes a woofer having a first permanent magnet disposed substantially within a center pole having an associated magnetic polarity and generating a flux path through an air gap, a voice coil at least partially positioned in the air gap and having an inside diameter larger than an outside diameter of the first permanent magnet, a frame, a spider connecting the voice coil to the frame, and a diaphragm connected between the voice coil and the frame. A tweeter is generally coaxially positioned relative to the woofer and includes a second permanent magnet. A third permanent magnet is coaxially positioned between the woofer and the tweeter. A non-magnetic structure may encompass the third permanent magnet. | 12-11-2014 |
| 20150010198 | ACOUSTIC TRANSDUCER - This invention relates to acoustic transducers with stationary and moving coils, and methods for operating the acoustic transducers. Time varying signals are applied to the moving and stationary coils to control the movement of a diaphragm, which produces sound. The time varying signal applied to the moving coil corresponds to at least a processed version of an input audio signal and is updated based on, at least, a version of the time varying signal applied to the stationary coil. Some embodiments include updating the processed version of the input audio signal in response to a magnetic flux value corresponding to the time-varying signal applied to the stationary coil. Some embodiments include updating the time-varying signal applied to the moving coil in response to a feedback signal. | 01-08-2015 |
| 20150030199 | Transducer Motor Structure with Enhanced Flux - An electro-dynamic loudspeaker transducer's motor structure includes a magnetic circuit having a pole with minimal reluctance that allows the use of larger magnets and thicker front plates, thus generating higher flux density in the voice coil gap. The lower reluctance is achieved by increasing the pole piece's outside diameter at all points outside of the voice coil gap and the area swept out by the voice coil at maximal inward excursion. Increasing the pole's diameter over a substantial amount of the pole's distally projecting length (but not extending into the magnetic gap), provides an increased cross sectional area and a reduced magnetic circuit reluctance. | 01-29-2015 |
| 20150078612 | STRUCTURE OF SPEAKER DRIVER - The present invention is to provide a structure of speaker driver, it comprising a base, a drum paper, a yoke, a sound coil and a magnetic unit. The base includes an upper combining portion and a lower combining portion. The drum paper is configured to the upper combining portion. The yoke is configured to the lower combining portion. The sound coil is configured to an underside of drum paper surroundingly. The magnetic unit has a magnet and a front plate, the magnetic unit is configured to above the yoke. Wherein an internal ring surface of yoke has a surface of first poly-magnet and a surface of second poly-magnet, the surface of first poly-magnet is closer to center of yoke than the internal ring surface, the surface of second poly-magnet rises along with the internal of yoke, a bottom of yoke also rises to correspond to the surface of second poly-magnet; an external ring surface of front piece is more distant from center of front piece than an external ring surface of magnet. The structure of speaker driver to gather magnetic lines for enhancing an intensity of magnetic field and reducing a loss of magnetic flux so as to prevent from magnetic leakage. | 03-19-2015 |
| 20150296302 | LOUDSPEAKER WITH COMPLIANTLY COUPLED LOW-FREQUENCY AND HIGH-FREQUENCY SECTIONS - A loudspeaker comprises a first acoustically radiating moving-coil transducer and a second acoustically radiating moving-coil transducer. Each transducer is actively driven by an electrical input signal. The first and second transducers are substantially coaxial and at least part of the second transducer is positioned within a central gap of the first transducer such that the voice-coil assemblies of the two transducers are arranged concentrically and are separated by an annular gap. The gap is substantially sealed by a compliant coupling means such that the two transducers move substantially in unison when the loudspeaker reproduces an input signal that has a frequency below a certain threshold value, but move substantially independently when the loudspeaker reproduces an input signal that has a frequency above the threshold. | 10-15-2015 |
| 20160057542 | DATA TRANSMISSION FROM SPEAKERS USING MAGNETIC FLUX COUPLING - Disclosed are various embodiments for data transmission from speakers using magnetic flux coupling. A speaker driver of a first device transmits a magnetic flux signal encoding configuration information. A magnetic flux detector of a second device receives the magnetic flux signal. A processor of the second device demodulates the magnetic flux signal to recover the configuration information. At least one operational parameter of the second device is configured using the configuration information. | 02-25-2016 |
