Abstract: The present disclosure relates to a magnetic circuit assembly of a bone conduction speaker. The magnetic circuit assembly may generate a first magnetic field. The magnetic circuit assembly may include a first magnetic element, and the first magnetic element may generate a second magnetic field. The magnetic circuit may further include a first magnetic guide element and at least one second magnetic element. The at least one second magnetic element may be configured to surround the first magnetic element and a magnetic gap may be configured between the second magnetic element and the first magnetic element. A magnetic field strength of the first magnetic field within the magnetic gap may exceed a magnetic field strength of the second magnetic field within the magnetic gap.

Abstract: The present disclosure relates to a magnetic circuit assembly of a bone conduction speaker. The magnetic circuit assembly may generate a first magnetic field. The magnetic circuit assembly may include a first magnetic element, and the first magnetic element may generate a second magnetic field. The magnetic circuit may further include a first magnetic guide element and at least one second magnetic element. The at least one second magnetic element may be configured to surround the first magnetic element and a magnetic gap may be configured between the second magnetic element and the first magnetic element. A magnetic field strength of the first magnetic field within the magnetic gap may exceed a magnetic field strength of the second magnetic field within the magnetic gap.

Abstract: Various implementations include loudspeaker transducers. In some aspects, an electro-acoustic transducer includes: a diaphragm configured to move along an axis; a voice coil having a plurality of windings around the axis; a voice coil support configured to transfer forces from the voice coil to the diaphragm; a support structure that inhibits radial motion or tilting motion of the diaphragm and the voice coil support; and a magnetic core for driving the voice coil, the magnetic core including: two magnets having opposite polarity and approximately equal magnetic strength, where each of the magnets surrounds the voice coil, where a magnetic field from each magnet is approximately symmetric along the axis, and where the magnetic field from both magnets drives the voice coil.

Abstract: A coaxial loudspeaker comprises a low frequency driver, a high frequency driver, and a magnetic circuit. The low frequency driver is configured to generate low frequency sounds and includes a first voice coil. The high frequency driver, coaxially aligned with the low frequency driver, is configured to generate high frequency sounds relative to the low frequency driver and includes a second voice coil. The magnetic circuit includes a first magnet configured to generate a first magnetic field, a second magnet configured to generate a second magnetic field, a first magnetic gap including magnetic flux from the first magnet and the second magnet in which the first voice coil is positioned, and a second magnetic gap including magnetic flux from the first magnet and the second magnet in which the second voice coil is positioned.

Abstract: The speaker as disclosed by the present invention includes a lower plate carrying an outer magnet assembly and an inner magnet assembly. The outer magnet assembly and the inner magnet assembly form a magnetic gap. The speaker further includes a suspension received in the magnetic gap for supporting a voice coil. The outer magnet assembly includes an outer main magnet, a top plate stacked on the outer main magnet, and an auxiliary magnet stacked on the top plate. The outer main magnet and the top plate are such configured that the magnetic gap has an inner diameter, along a direction from the diaphragm toward the lower plate, gradually increasing and then gradually decreasing. The suspension locates at the region having the greatest inner diameter.

Abstract: In at least one embodiment, a tactile transducer including a housing, a first voice coil and a magnetic assembly is provided. The first voice coil includes an electrically conductive wire being orientated in a first winding direction to generate a first magnetic field. The magnetic assembly is positioned within the housing. The magnetic assembly is configured to move within the housing to generate a tactile output and to repel against the first voice coil based on a polarity of the first magnetic field as the magnetic assembly moves toward the first voice coil to prevent contact of a first portion of the magnetic assembly with a first side of the housing.

Abstract: Disclosed is a multi-strand independent input-output voice coil. The voice coil is a potted coil, which is formed by winding in the following steps: a. forming a multi-strand flat cable by synchronizing and juxtaposing at least two enameled wires; b. winding the multi-strand flat cable to form the potted coil, each enameled wire including independent current input and output ends; and c. under the control of an ICE chip, forming, by the enameled wires together, a multiple-input multiple-output electrical connection end to correspond to vibration drive control of sounds at different frequencies separately. During use, the independent current input and output ends of the enameled wires reduce impact of inertia in vibration of a vibrating diaphragm and impact of a frequency and current on a sound during a change in a volume or tone. Quality of a sound made by the loudspeaker is notably improved.

Abstract: A long stroke speaker is provided in the present disclosure. The long stroke speaker includes a shell, a magnetic system, and a vibrating system. The magnetic system includes a magnet assembly and a magnetic guiding module cooperatively for forming a magnetic gap. The vibrating system includes a membrane, a coil support connected to the membrane, and a voice coil connected to the coil support. The magnet assembly includes a first magnet, a second magnet and a pole member, a magnetic direction of the first magnet and a magnetic direction of the second magnet are parallel to a vibration direction of the vibrating system, and an end of the first magnet adjacent to the pole member has a same polarity as an end of the second magnet adjacent to the pole member. The voice coil is arranged at the magnetic gap and surrounds the pole member.

Abstract: A dual coil transducer is provided that has a low profile construction. The transducer includes a voice coil disposed around a central region of the transducer, a diaphragm with flexible suspension extending generally outwardly from the central region and including an inner edge attached to the voice coil, where the diaphragm includes a concave surface, and at least one magnet assembly disposed forward of the concave surface, where the at least one magnet assembly defines at least two magnetic gaps disposed about the central region. The transducer will usually be mounted with the motor outside of the loudspeaker enclosure for best heat dissipation.

Abstract: A dual coil loudspeaker system having a voice coil having a first coil configured to receive a first electrical signal from a first source, and a second coil configured to receive a second electrical signal from a second source different from the first source; a field magnet configured to generate a magnetic field that interacts with magnetic fields created by the first coil and the second coil; and a diaphragm connected to the voice coil such that the diaphragm is displaced in response to energization of at least one of the first coil and the second coil.

Abstract: A speaker includes a yoke defining a receiving cavity therein, a first magnet received in the receiving cavity of the yoke, a second magnet received in the receiving cavity of the yoke and opposite to the first magnet, a first coil surrounding the first magnet, a second coil surrounding the second magnet, and a diaphragm drove to vibrate by both of the first coil and the second coil. A shape of the first coil is approximately a horse's hoof and defines a first linear side, a flexuous side and a pair of first arc sides coupled with two ends of the first linear side and two ends of the flexuous side.

Abstract: An audio speaker with at least two electric coils on opposite sides of at least one ferro-magnetic plate, the coils and plate forming a radial electro-magnet. A radial electro-magnet can offer many advantages in stereo loudspeakers. The coils are electrically driven in opposite directions. Multiple sets of two coils and intervening ferro-magnetic plate may be provided, adjacent sets being separated by a non-magnetic plate.

Abstract: A micro-electro-mechanical-system microphone package includes a substrate, a micro-electro-mechanical-system microphone chip mounted on the substrate, and a cover attached to the substrate to cover the micro-electro-mechanical-system microphone chip. The cover is provided with a sound inlet through which the micro-electro-mechanical-system microphone receives external sound. The micro-electro-mechanical-system microphone chip includes a conductive base connected to a constant voltage, a shielding layer supported by the conductive base and connected to the constant voltage, a diaphragm disposed between the conductive base and the shielding layer, and a back plate also disposed between the conductive base and the shielding layer.

Abstract: The present invention relates to a low-inductance electromagnetic drive without driving magnetic flux circuit, which comprises a magnetic pole, a drive coil, an upper magnetic inductive board, a permanent magnet and a lower magnetic-inductive board. The magnetic pole is integrated with the lower magnetic-inductive board, and the permanent magnet is located between the upper magnetic-inductive board 4 and lower magnetic-inductive board 6. The drive coil is wrapped around the magnetic pole and is movable in the axial direction. The electromagnetic drive further comprises the fastening coil, and the fastening coil is fastened to a certain proper place of the magnetic flux circuit of the drive coil. Furthermore, the fastening coil is connected with the drive coil in opposite phase.

Abstract: A multiple voice-coil cone-driver for driving a loudspeaker includes a first voice-coil, and a second voice-coil coupled in parallel to the first voice-coil. Together, the first and second voice-coils in parallel are characterized by a baseline frequency response with an upper threshold frequency. In addition, at least one additional voice-coil (e.g., a third voice-coil) is coupled in parallel to the first and second voice-coils. The additional voice-coil(s), in conjunction with the first and second voice-coils, provide an enhanced frequency response in comparison to the baseline frequency response. One aspect of the enhanced frequency response is that it has an extended upper threshold frequency compared to the baseline frequency response, providing for more accurate reproduction of music and speech from a single speaker.

Abstract: An amount of movement of an air passing through a clearance G2 is adjusted by adjusting the clearance G2 by placing an outer shape surface 35 of a yoke 3 in proximity of an inner side surface of a housing 1. Accordingly, a vibration characteristic having a wide frequency bandwidth can be obtained, thereby improving stability and convenience of body-sensible vibration characteristic of a multifunctional vibration actuator.

Abstract: A loudspeaker system, which has the ability to create a homogeneous sound over large distances, comprising at least one line-source of acoustical radiation, each comprising three or more essentially identical speaker-units arranged adjacent to each other at a center-to-center spacing D1, and at least one elongated high frequency transducer arranged in parallel with said line source(s), said elongated high frequency transducer(s) having an essentially continuous radiating surface along the axis of elongation. Where the crossover frequency FCR and the distance D1, for said line-source(s), is set according to new design criteria, taking into account the frequency response from said speaker units in said line-sources and the optimal performance for a line-source. A method is also included, by which a homogeneous sound over large distances can be accomplished.

Abstract: A panel transducer includes a diaphragm with areas of multiple electrical conductors, two rows of magnetic bars, two metal plates and a clamping frame. The diaphragm is clamped in the clamping frame and is positioned between the two rows of magnetic bars. Each row of magnetic plates is in close proximity to the clamped diaphragm. Each metal plate has holes. The holes correspond to spacing areas between the magnetic bars and acoustically connect the diaphragm to outside media. The magnetic bars are sequentially located on the metal plates with spacing between the magnetic bars. The diaphragm is secured to the clamping frame and has an active surface area under tension spaced inwardly of the clamping frame. There are no side magnetic bars at the ends of each of the row. Absorbing strips are used in place of the absent magnetic bars filling the space between the side magnetic bars and the clamping frame.

Abstract: An electromechanical and electroacoustic transducer is compact and has a simple drive circuit. Two independent magnetic circuits share a single permanent magnet. A voice coil is placed in one of the magnetic circuits, and a magnetic weight is placed in the other magnetic circuit. A switching element is turned on and off upon movements of the magnetic weight.

Abstract: Disclosed herein is a combined receiver and speaker. The combined receiver and speaker has a diaphragm, a voice coil, and a chip resistor. The diaphragm generates sounds of a predetermined frequency through vibrations caused by a sound pressure in speaker and receiver modes. The voice coil vibrates the diaphragm using a magnetic field formed around a magnet attached to the diaphragm and generated by applied voice current. The chip resistor decreases the intensity of the applied voice current. The voice current is selectively applied to the voice coil such that the voice current is applied to the voice coil from speaker terminals in speaker mode, while the voice current is applied to the voice coil via the chip resistor from receiver terminals in receiver mode.

Abstract: An electromagnetic actuator comprises: a magnet; a pole piece mounted to the magnet; a yoke facing the pole piece; a coil base having a vibration coil; leaf springs for supporting the coil base and a weight; a case for enclosing them; a cover for covering one side of the case; and a diaphragm having a voice coil, wherein the arms of the coil base are inserted through notches formed in the yoke, and the vibration coil and the voice coil is disposed in a gap in which the pole piece and the yoke face each other. The weight vibrates by the application of a low-frequency current to the vibration coil, and the diaphragm vibrates by the application of a high-frequency current to the voice coil.

Abstract: A fixed electrode is divided into a plurality of electrode pieces and driving signals of different voltages are applied to the electrode pieces such that a distribution of driving forces applied to a vibrator is proportional to the surface displacement distribution in a vibration mode across the vibrator.

Abstract: The present invention uses multivoice coil drivers in conjunction with the small satellite speakers of multichannel surround sound systems to achieve an overall linear response between 100 Hz to above 15 KHz. The multivoice coil drivers are designed to respond only to frequencies that fall between conventional upper base and lower midrange crossover frequencies which typically extend between 75 Hz and 225 Hz. The invention relies on the characteristics of human hearing which limits the listener's ability to localize the source of sound approximately to the wavelength of the sound being heard. The system may be incorporated in existing front and rear center speakers or separate enclosures to supplement the overall surround sound system.

Abstract: In a speaker which is constructed in a manner that a voice coil bobbin is attached to an inner circumferential portion of a cone type diaphragm while a voice coil is wound around the voice coil bobbin, and the voice coil is inserted into a magnetic gap, the voice coil bobbin is formed of a conductive material while the voice coil being fixed is the voice coil bobbin by a soft bonding agent, and in a very high range, the voice coil is operated as a driving coil while the voice coil bobbin is operated as a short coil.

Abstract: A speaker apparatus has a magnetic circuit portion, a diaphragm, a secondary coil, at least one primary coil, a cylindrical member, and a positioning portion. The magnetic circuit portion has a magnet, a yoke for which the magnet is provided, and a top plate for forming a magnetic gap together with the yoke. The primary coil is arranged in the magnetic gap of the magnetic circuit portion. The secondary coil is provided for the diaphragm so as to face the primary coil in the magnetic gap. One side of the cylindrical member locating in the magnetic gap is attached to the primary coil, and the cylindrical member supplies a current to the primary coil. The positioning portion is provided for a yoke and positions the other side of the cylindrical member.

Abstract: A speaker system includes a plurality of double-voice-coil speaker units fitted to a closed type cabinet and connected in parallel with each other so that first voice coils are connected to each other at the same polarities, and second voice coils are connected to each other at the same polarities, and a single impedance compensating circuit is connected in series to the second voice coils for making the input impedance as the speaker system constant.

Abstract: A panel-form loudspeaker has two distributed mode acoustic radiators coupled by a resilient suspension. Each radiator has its own transducer.