Abstract: A loudspeaker having an annular speaker cone with a central orifice, a voice coil bobbin attached to the annular speaker cone and a permanent magnet for producing a magnetic field in an air gap. A dust barrier blocks the transfer of material, such as magnetically attracted dust, through the central orifice into the air gap.

Abstract: A magnetic core for speaker is constructed to include an annular magnet connectable to the body of the speaker, a center magnet mounted in the center of the annular magnet and connectable to the body of the speaker, an annular magnetically conducting plate mounted on the topmost edge of the annular magnet, and a center magnetically conducting plate mounted on the topmost edge of the center magnet for producing a magnetic loop with the annular magnetically conducting plate.

Abstract: A loudspeaker having an improved air cooling system. The loudspeaker includes a speaker frame, a diaphragm connected to the speaker frame, a voice coil which is formed on a voice coil bobbin and is connected to the diaphragm for vibrating the diaphragm, a permanent magnet having a central opening, a pole piece disposed coaxially within the central opening of the permanent magnet to form an air gap into which the voice coil is disposed, and a heat transfer plate disposed over the permanent magnet. The heat transfer plate has a plurality of cooling fins which are radially outwardly extending toward an outer rim thereof and inner and outer air openings on the outer rim. The outer rim has a step like shape in cross section and has a flat upper surface which is higher than top ends of the cooling fins. The vibration of the diaphragm produces air flows through air passages on the heat transfer plate between the inside and outside of the loudspeaker.

Abstract: A pair of lead wire drawn from a voice coil is fixed to a land portion of a pair of terminal member by thermo-compression bonding. The pair of terminal member is integrally formed with the frame by insert molding. The frame made of synthetic resin has a pair of circular holes on the back side of the land portion to expose the land portion to the back space of the frame. In thermo-compression bonding, a supporting jig is pressed against the back side of the land portion via the circular hole. Thereby, generated heat is immediately transmitted to the supporting jig, preventing melting part of the frame around the land portion. Pressing force of a thermo-compression jig is received by the supporting jig, preventing sinking of the land portion in the frame.

Abstract: Disclosed is a concentric magnetic configuration for a speaker system which can produce a full range of frequency sounds from a single source magnet. The magnetic configuration of the present invention includes a high frequency pole plate and one or more middle yoke iron plate placed directly on a cylindrical permanent magnet wherein at least one magnetic flux controlling slot is formed beneath the high frequency pole plate and the middle yoke plate. The multiple air gaps defined by the pole plate and middle yoke iron produce a full range of frequency magnetic fields which can drive the high, medium, and low frequency voice coils.

Abstract: An electro-dynamic inertial vibration exciter (1), for exciting a member (2) having capability to sustain and propagate input vibrational energy comprising a motor coil assembly (3, 4) having a coil (3) rigidly fixed to a tubular coil former member (4), a magnet assembly (5, 6, 7) disposed concentrically with respect to the motor coil assembly, and means (11) suspending the magnet assembly for axial movement relative to the motor coil assembly, characterized by a carrier (9) supporting the motor coil assembly (3, 4) and adapted for connection to the member (2) to be excited.

Abstract: An electro-mechancial transducer, including a magnetic assembly producing a magnetic field having two or more displaced regions of greater intensity, having magnetic flex in substantially similar directions, separated by and surrounded by regions of lower intensity magnetic field, and an electrically conductive and mobile member disposed in and capable of moving through a magnetic field.

Abstract: A loudspeaker having an improved acoustic performance achieved by low distortion and high output power. The loudspeaker includes a speaker frame, a diaphragm connected to the speaker frame, a voice coil which is formed on a voice coil bobbin and is connected to the diaphragm for vibrating the diaphragm, a permanent magnet having a central opening, and a pole piece disposed coaxially within the central opening of the permanent magnet to form an air gap into which the voice coil is disposed. The top area of the through hole of the pole piece is curved with an S-shape in cross section and an inner diameter of the through hole is increased toward the inner top thereof.

Abstract: An open-type magnetic circuitry of loudspeaker includes a lower yoke having a central portion upward projected to form a bobbin, a magnet positioned on top of the bobbin, a voice coil wound around the bobbin and the magnet, and a diaphragm connected at a root portion to the voice coil. The magnetic circuitry of loudspeaker is characterized in that the lower yoke is provided at an upper side surrounding the bobbin with a plurality of radially equally spaced supporting posts, a top end of which being higher than at least a bottom side of the magnet, and that a ring-shaped upper yoke having a central hole is covered onto the top end of the supporting posts, such that heat produced by the voice coil during working could quickly dissipate via the spaces among the supporting posts. Since no heat would accumulate in the loudspeaker, the loudspeaker could always maintain good sound quality.

Abstract: Disclosed is a multi actuator including a case having a space and a groove therein, a vibration plate for generating sound, of which outer end portion is fixed to an upper end portion of the case, a voice coil fixed to a lower end portion of the vibration plate, a magnet magnetized vertically, an upper plate attached to the magnet, for generating a magnetic field, a yoke for generating the magnetic field together with the magnet, upper and lower plate springs for supporting the yoke and vibration mass including a weight, and a vibration coil installed in an upper surface of a shield plate, for generating vibration using a magnetic flux formed in the magnetic field. The multi actuator used for mobile communication systems such as cellular phones and pagers provides a structure that prevents the plate springs from being deformed to improve reliability and vibration characteristic.

Abstract: Differential flow vents allow airflow within a vent to be preferential. A flange disposed within a vent introduces non-linearities and causes a preferred direction of airflow into an expanding volume. The differential flow vents are used in conjunction with the natural motion of the loudspeaker cone acting as a pump to cool the loudspeaker cabinet enclosure without having to directly cool the woofer magnet structure. In one embodiment, at least one pair of opposed differential flow vents within the cabinet enclosure provide fresh air to be preferentially circulated to cool the interior of a loudspeaker system. In another embodiment, by providing an odd number of opposed differential flow vents within the cabinet enclosure, positive air circulation also results. By making either the pairs or odd number of differential flow vents to be asymmetrical, dynamic woofer offset is compensated.

Abstract: An electroacoustic transducer (1) having an oscillator coil (15) which has two connecting leads (27, 28) is equipped with at least one retaining element (33, 34) for each connecting lead (27, 28), each retaining element (33, 34) being connected to a stationary component (2) of the transducer (1) and being held movable in relation to said stationary component (2), while said stationary component (2) borders a holding space (39, 40) through which a connecting lead (27, 28) being passed through.

Abstract: A multi-functional vibration actuator comprises a vibration transmitting portion (8) forming a peripheral portion thereof, a magnetic circuit formed by a yoke (1), a permanent magnet (2), and a plate (3), a vibrator member (5) arranged at a distance from one surface of the magnetic circuit and having an outer periphery fixed to the vibration transmitting portion, a coil (6) arranged in a gap within the magnetic circuit at a distance from the magnetic circuit and fixedly attached to the vibrator member, and a suspension (4) fixed to the vibration transmitting portion and flexibly supporting the magnetic circuit. The distance (b) between the vibrator member and each of the one surface of the magnetic circuit and the suspension is greater than the distance (a) between the other surface of the magnetic circuit and a bottom cover (9) covering the magnetic circuit.

Abstract: An air flow control device is positioned relative to the throughbore in the pole piece of the motor structure of a speaker, such that the flow of air entering and leaving a cavity overlying the voice coil and pole piece is directed along a flow path which passes in thermal communication with at least a portion of the interior surface of the former of the voice coil opposite the wire winding on the exterior surface of the former.

Abstract: A loudspeaker magnetic motor utilizes a voice coil with two or more wire coils that are connected in parallel and that are layered on top of one another. The motor utilizes, as a magnetic field source, a permanent magnet and, more particularly, a permanent magnet that includes a rare earth metal such as a neodymium boron iron magnet.

Abstract: A diaphragm is mounted in a cover for producing sounds, a vibrating assembly including a pole piece is resiliently mounted in the cover so as to be vibrated. A receiving portion is formed on the pole piece of the vibrating assembly for receiving a mass adjusting adhesive, so that the vibration frequency of the vibrating assembly is adjusted to a predetermined frequency.

Abstract: A ring magnet having improved linearity and/or peak value in a pace magnetic flux density distribution, comprising at least one first radially anisotropic region having a radial anisotropy direction of 89° or more relative to a center axis thereof, and at least one second radially anisotropic region having a radial anisotropy direction of 40° or more and less than 89° relative to a center axis thereof, the first and second radially anisotropic regions being arranged along the center axis such that a space magnetic flux density distribution on an inner or outer surface of the ring magnet has increased linearity and/or peak value.

Abstract: A high stability loudspeaker has a yoke with a plurality of vents installed therein. The yoke is combined to a bottom of a frame of the loudspeaker. A magnet is placed in the yoke. A washer is arranged above the magnet. A periphery of the magnet is surrounded by a voice coil. A coil winding surrounds the voice coil. A combining portion is formed at a periphery of the yoke. The combining portion serves to be combined with a surround connected to a bottom of end of the voice coil. The voice coils is vertically installed in a gap between the portions of the yoke. The top of the voice coil is connected to another surround. Thereby, vibration of the voice coil is confined at the two ends. As a result, the gap between portions of the yoke structure into which the voice coil extends between portions of the yoke is reduced and therefore, the sensitivity of the loudspeaker is increased and the distortion is decreased.

Abstract: An improved speaker structure includes dual suspension edges connecting a support seat, a sound ring and a diaphragm. Therefore, when the speaker outputs, the dual suspension edge will not deviate and can perform a highly vertical cutting movement. Besides, the dual suspension edge can perform a flip-flop movement and distribution, and can compensate insufficient tensile force during reverse vibration so as to increase power, reduce distortion, and enable the diaphragm to be independently secured to a top portion of the sound ring to obtain better sound quality.

Abstract: A speaker includes: a frame; a magnetic circuit fixed to the frame; a diaphragm fixed to the frame so as to be capable of vibrating in a predetermined direction; a driving force transmitting member connected to the diaphragm; and a damper for supporting the driving force transmitting member, wherein the magnetic circuit is positioned between a first plane and a second plane, the first plane being parallel to the diaphragm and defined as a plane with which at least a portion of the magnetic circuit is in contact, and the second plane being parallel to the diaphragm and defined as a plane with which at least a portion of the magnetic circuit is in contact, and one end of the damper is connected at a position between the first and second planes, and the other end of the damper is connected at another position between the first and second planes.

Abstract: An electromagnetic transducer includes: a first diaphragm; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having a first opening in a central portion thereof; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm, wherein the center pole has a shape which allows insertion into the first opening; a coil disposed so as to surround the center pole; and a first magnet disposed so as to surround the coil.

Abstract: A speaker and the manufacturing method thereof is disclosed wherein a diaphragm is enclosed by the peripheral frame, a resonant space is in the center enclosed by frame and diaphragm, and a winding is around a center seat. Winding is excited to generate varying magnetic lines for generating a continuous attraction-repulsion effect in the magnetic member when an electric current is flowed through, thereby vertically sliding the magnetic member to cause the diaphragm to generate sound. This can significantly reduce the thickness, simplify assembly, reduce manufacturing cost, increase the travel of diaphragm, significantly enhance the low-frequency characteristics, and increase power of speaker.

Abstract: A magnetic circuit of a micro speaker is disclosed. A magnet and an upper plate are mounted upon a yoke part, and this structure is placed within upper and lower dies, leaving a gap. Then an injection molding is carried out by injecting a resin into the gap within the dies, so that a speaker frame is formed to unitizingly secure the yoke part, the magnet and the upper plate, thereby completing the magnetic circuit of the micro speaker. Thus the coupling between the components are made firm, and the product can be made slim.

Abstract: An electro-acoustic micro-transducer having a high power, high efficiency acoustic transducing feature and a three-mode broad band frequency reproduction feature on a micro-scale basis is provided. The electro-acoustic micro-transducer includes a yoke formed of an internal groove and a vertical incision portion for removing a vertical wall at one side surface, a permanent magnet installed in the groove of the yoke, a plate for forming a magnetic gap, a coil wound on the bobbin, a frame which surrounds the yoke, in which a throughhole is formed in the groove corresponding to the incision portion of the yoke, and a vibration diaphragm. Therefor, spaces in the incision portion of the yoke and the frame are formed so that a connection portion between the coil and lead wire can be prevented from contacting the yoke during vertical vibration, to thereby extend an up-and-down vibration width of the bobbin.

Abstract: A loudspeaker comprises a motor stator providing an air gap, a voice coil, a support for supporting the voice coil in the air gap, a diaphragm coupled to the voice coil for reciprocation with the voice coil, and a frame for supporting the diaphragm. The motor stator comprises a back wall and a sidewall defining a somewhat cup-shaped interior, and a center pole comprising a permanent magnet. The center pole comprises a thermally relatively less conductive material. A passageway is provided through the center pole. A heat sink has a first portion for surmounting the center pole. The first portion is oriented adjacent the air gap. A second portion is coupled to the first portion in heat conducting relation and extends through the passageway to conduct heat away from the air gap through the passageway. The first and second portions comprise a thermally relatively more conductive material.

Abstract: A loudspeaker (10) according to the invention is presented, which contains at least one radially magnetized permanent magnet (12), and whose receiving part is made of a paramagnetic or diamagnetic material. Such loudspeakers (10) can be constructed in a very simple and compact manner. With the further development of loudspeakers (10) able to utilize the stray flux from radially magnetized permanent magnets (12), it is possible to produce derivations with two diaphragms (13, 13′) with identical reproduction frequencies, without great cost.

Abstract: An electroacoustic transducer, functioning as an acoustic pick-up or as a sound generator, has a housing having a bottom and a wall portion. A diaphragm is connected to the housing opposite the bottom and encloses a diaphragm volume. An electromagnetic system is arranged in the housing and has a coil connected to the diaphragm. The housing has at least one cutout cooperating with at least one projection provided on a device in which the electroacoustic transducer is to be mounted. The projection defines a passage between the diaphragm volume and a volume at the back of the housing and thus forms the main air passage.

Abstract: A speaker arrangement in which a diaphragm does not displace in directions other than a regular oscillating direction. The speaker arrangement includes a magnetic circuit having a magnetic gap, a voice coil located in the magnetic gap, a voice coil bobbin having the voice coil wound thereon, a diaphragm mounted on the voice coil bobbin, a hollow portion extending in a longitudinal direction of the voice coil bobbin and defined inside that portion of the magnetic circuit which is surrounded by the voice coil, an elongated rod inserted in the hollow portion of the magnetic circuit and fixed to the diaphragm, and at least one support member located at a predetermined position in the hollow portion of the magnetic circuit for movably supporting the elongated rod in the magnetic circuit hollow portion.

Abstract: A loudspeaker having an air cooled voice coil. The speaker includes frame, a cone and a cap collectively forming a vibratingly drivable diaphragm, a magnet, a pole piece, a voice coil disposed to drive the diaphragm, and preferably a spider disposed to secure the diaphragm to the frame at one end of the diaphragm. The magnet is part of a magnet assembly having air passages disposed to enable air to flow over the voice coil, and to be efficiently conducted away therefrom. The voice coil has apertures enabling cooling air to flow from the air passages in close, heat exchange relation to the voice coil. In alternative embodiments, the air passages extend horizontally and vertically through the magnet assembly, and may interconnect. Preferably, the diaphragm acts to pressurize air to establish flow for cooling purposes. In alternative embodiments, independent sources of pressurized air are contemplated.

Abstract: The present invention comprises an improved center pole having a distortion reduction cap and an improved method of coupling the cap to a speaker center pole. The speaker assembly comprises a distortion reduction cap and a cylindrical center pole having a gripping surface formed on an outer cylindrical surface of the center pole and a frustoconical recess on a top surface of the center pole. The cap is coupled to the center pole through the application of pressure on the cap to conform the cap to the center pole and to non-rotatably couple the cap onto the center pole by deforming a portion of the cap against the gripping surface. The distortion reduction cap is coupled to the center pole in a manner forming a corresponding fiustoconical portion mating with the frustoconical recess on the top surface of the center pole in a manner providing an air tight seal.

Abstract: In an electroacoustic transducer (1) having a magnet system (7) and having a moving coil (15), which is disposed in the air gap (14) of the magnet system (7), and having a diaphragm (17) attached to the moving coil (15) the diaphragm (17) has a mounting zone (24) for mounting the moving coil (15), the diaphragm (17) having projections (25) in the mounting zone (24) and the diaphragm (17) having an interspace between every two projections (25), two stabilizing walls (32, 33), which are inclined with respect to the diaphragm axis (18), are arranged each interspace and are arranged so as to form a roof shape and are formed so as to project beyond the mounting zone (24) in radial directions.

Abstract: A speaker apparatus for reproducing acoustic sounds includes a magnetic circuit unit having a substantially ring-shaped center plate of a magnetic material and a set of substantially annular magnets arranged on both sides of the center plate so that magnetic poles of repulsive polarities face each other with the center plate in-between. The magnetic circuit unit produces a magnetic field on each of an inner rim side and an outer rim side of the center plate. The speaker apparatus also includes a first vibrating system including a first vibrating plate arranged on the inner rim side of the center plate so as to be driven by the magnetic circuit unit, and a second vibrating system including a second vibrating plate arranged on the outer rim side of the center plate so as to be driven by the magnetic circuit unit. The first and second vibrating plates are substantially flat plate shaped and arranged so that their respective major surfaces lie on substantially the same horizontal plane.

Abstract: A loudspeaker is disclosed having a pole piece formed with at least one axial bore, and at least one vent bore extending between the outer surface of the pole piece and intersecting the axial bore at a location where the voice coil of the loudspeaker is concentrically disposed about the pole piece. The at least one axial bore and at least one vent bore are effective to cause the flow of cooling air, which enters and exits the dust cap cavity from outside of the speaker, to flow directly against at least a portion of the interior of the former of the voice coil.

Abstract: A surface-mounted electromagnetic sound generator generates sound by causing a vibration plate to vibrate by an electromagnet which includes a yoke and a coil housed in a case. The yoke has a magnetic-circuit board an outer circumferential portion of which is provided with a drawn portion, the drawn portion being imbedded in the case by insert-molding when the case is molded.

Abstract: An electroacoustic transducer, which has a diaphragm, a support member for supporting the diaphragm, a pole piece placed inside the support member and comprising a core and a base, a coil wound around the core, and a magnet placed between the support member and the coil, in which the pole piece or at least the core thereof is made of resin to which a magnetization is applied.

Abstract: A voice coil adaptor ring and loudspeaker system of the moving coil type including a cone diaphragm supported by a frame, a voice coil former for supporting a voice coil, and a lower suspension for securing and centering the voice coil former in a magnetic gap while it is displaced by a magnetic circuit. The voice coil adaptor ring is mounted over the voice coil former and comprises a substantially cylindrical sleeve having a lower diameter for fitting over the top plate; at least one ledge extending outward from said sleeve for supporting the cone and lower suspension; an inherent gap for receiving epoxies; and a plurality of venting passages in fluid communication with a cap volume defined by the cone and dust cap for venting hot air from the cap volume.

Abstract: In an electroacoustic transducer (1) including a substantially hollow cylindrical magnet system (9) which is substantially centro-symmetrical with respect to a transducer axis (2), a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) having two coil leads (20), and two contact terminals which, viewed in the direction of the transducer axis (2), are disposed inside the magnet system (9) and are each connected to one coil lead (20), the contact terminals are spring contacts (21, 22) which are formed with at least one bend and are preferably U-shaped, having two limbs (23, 24) extending transversely to the transducer axis (2) and including a first limb (23), which is mechanically connected to a contact holder (26) of the transducer (21), and a second limb (24) having contact faces (25) which are movable parallel to the transducer axis (2), the contact faces (25) of both spring contacts (21, 22) having different radial distances from the transducer axis (2).

Abstract: An electromagnetic induction type acoustic transducer including a plate as an assembly of a magnetic circuit and having an opening of a predetermined diameter about a central axis, a pole piece as an assembly of the magnetic circuit and protruded on the central axis, having an outer peripheral diameter smaller than the opening of the plate and having an upper surface located lower than a lower surface of an opening peripheral portion of the plate by a predetermined distance, a lower surface portion of the opening peripheral portion of the plate and an upper surface portion of the pole piece constitute a magnetic gap of the magnetic circuit,a diaphragm vibrated in the upper and lower direction on the central axis at the position perpendicular to the central axis in the predetermined distance, an annular ring attached to the diaphragm at the position of the magnetic gap, and a coil attached to the plate and/or pole piece.

Abstract: A loudspeaker (10) with a magnet system (12) arranged in a space (32) surrounded by a conical diaphragm (14) has a core (20) of the magnet system (12) first connected to the loudspeaker basket (11) and only then is the pot (19) connected to the core 20. It is then possible to manufacture loudspeakers (10) with internally located magnet systems (12) on production lines which can also be used to manufacture loudspeakers with magnet systems (12) that are located on the outside of the basket (11). Because the pot (19) is only installed later in the core (20) a centering bushing (34) can be placed between the core (20) and the voice coil support (18), which leads to a considerable improvement in the production quality of such loudspeakers (10).

Abstract: A high power compact tweeter which includes a high energy magnet sandwiched between the base of a yoke and top plate which form the magnetic path, the magnet and top plate being spaced from side walls of the yoke by a predetermined gap. A voice coil is positioned in the gap. A heat sink is in thermal contact with the yoke to facilitate, preferably in conjunction with heat transfer management from the speaker.

Abstract: An audio surround-sound system includes a main enclosure, an audio decoder device to decode audio source signals supplied by an audio source device to provide decoded audio signals, and at least a first and second low distortion amplifier housed within the main enclosure to receive and amplify the decoded audio signals. Also included is at least a first and a second speaker element operatively coupled to the at least first and second amplifiers, respectively, to produce the audible signals, where the audible signals are received by the listener from a first and second direction. A local radio transmitter converts a portion of the decoded audio signals into radio modulated signals and transmits the radio modulated signals where a wireless receiver receives and converts the radio modulated signals into remote audio source signals.