Abstract: A speaker and a method of manufacturing the speaker are provided. The speaker includes a terminal board attached to a side surface of the frame and connected to the electric signals, a dust cap for preventing the inflow of foreign matters into a gap of the magnetic circuitry, an edge formed on the circumference of the cone paper, and a gasket acting to prevent the resonance of the frame and a cover with metal parts, in fixing the frame and the cover of the speaker, and to prevent the delamination and separation of the edge from the cone paper by the vibration of the cone paper. The damper is maximally enlarged in its size, thereby maximizing amplitude of output sound via the damper and attenuating a low band factor. The damper is connected to the upper surface of the voice coil and the upper surface of the frame. Thereby, in case of a speaker with a size of less than &PHgr;45 mm, the minimum resonance frequency can be attenuated to less than 300 Hz.

Abstract: A loudspeaker includes a magnet assembly defining an air gap, a voice coil disposed in the air gap, a diaphragm coupled to the voice coil for vibrating with the voice coil, a flexible spider connected to the voice coil and the diaphragm, a pair of spaced apart speaker tinsel conductors spaced apart from the spider and respectively connected to two connecting ends of the voice coil, and a wire stabilizer interconnecting the speaker tinsel conductors so as to prevent twisting and collision between the speaker tinsel conductors during vibration of the voice coil and the diaphragm.

Abstract: An electroacoustic transducer has a diaphragm having an asymmetric shape, having a flat vibrating surface with major and minor axes when viewed from a direction of vibration, having continuous curvatures of concavity and convexity in a direction of the major axis. The diaphragm is provided with a slot formed almost at the center of the vibrating surface in a direction perpendicular to the major-axis direction and a groove provided along the periphery of the vibrating surface. A fringe is connected to the groove as surrounding the groove, for sustaining the diaphragm against vibration. A voice-coil bobbin is connected to the diaphragm. A voice coil is wound around the voice-coil bobbin. Hook suspensions are provided at both ends of the voice coil in the major-axis direction to support the voice coil against vibration occurring when a magnetic circuit applies fluxes to the voice coil.

Abstract: A sound-vibration generating device includes as arranged in a main body case a sound generating unit and a vibration generating unit. The main body case has attached to a bottom portion thereof a bottom plate to be soldered to a land on a printed wiring board, and is provided at an end portion thereof with a pair of connecting terminals for receiving a drive signal for driving the sound generating unit and/or the vibration generating unit. The connecting terminals are provided at lower ends thereof with joint portions to be soldered to respective lands on the printed wiring board. The rear surface of the bottom plate and the rear faces of the joint portions of the terminals are positioned on the same plane or approximately the same plane to thereby render the sound-vibration generating device mountable on the surface of the board.

Abstract: A kind of elastic fabric cloth (damper) is exclusively installed in a loud speaker. The fabric cloth is firstly cross-knitted with numerous fiber threads to form a wafer, then hot-pressed by molding to become a disk with corrugated annular strips on its surface. A plurality of conductive wires is aligned to penetrate gaps of the fiber threads of the fabric cloth and glued or fastened to the top ends or the root portions of the annular strips to thereby stably fix the conductive wires onto the fabric cloth without spoiling the strength and elasticity thereof.

Abstract: An electroacoustic transducer to be mounted on a board of a device, includes an anode conductive part which is in press contact with the board of the device, and a cathode conductive part which is in press contact with the board of the device, wherein the anode conductive part and the cathode conductive part are respectively placed at an axial center position or at predetermined positions in a radial direction to eliminate directionality in a circumferential direction.

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: A micro speaker is disclosed. An oscillating plate is secured to the bottom of a protecting cover, and a terminal is installed on a side of the protecting cover, the terminal being electrically connected to a voice coil. A magnetic circuit is secured into a recess of a frame, and the protecting cover is attached on the top of the frame. Accordingly, when disassembling the speaker unit, any damage of the oscillating plate can be excluded. Further, when grounding the terminal to a circuit board, the connecting portion of the terminal is prevented from forming a short circuit.

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: In an electroacoustic transducer (1) having a magnet system (8) and having a diaphragm holder (2) for holding a diaphragm (17) and having a moving coil (115) connected to the diaphragm (17), the moving coil (15) has a hollow cylindrical coil body (27) and two connecting leads (28, 29), a holding element (38, 39) connected to the diaphragm holder (2) being provided for each connecting lead (28, 29), which holding elements (38, 39) are constructed to be elastically deformable in a direction substantially parallel to the diaphragm axis (26) and, preferably, also to be mechanically damping.

Abstract: A speech aid device having a housing and a solenoid disposed in the housing operatively coupled with a sounding head for movement therewith. The solenoid includes a wire coil with a top secured adjacent to an end of the wire coil. The top has an edge in which a groove is formed to receive an end of a wire forming the wire coil such that the wire is prevented from contact with the housing. A lead wire having two ends is electrically connected at one end to the end of the wire. The electrical connection is secured to the top with silicone.

Abstract: An electroacoustic transducer has a diaphragm having an asymmetric shape, having a flat vibrating surface with major and minor axes when viewed from a direction of vibration, having continuous curvatures of concavity and convexity in a direction of the major axis. The diaphragm is provided with a slot formed almost at the center of the vibrating surface in a direction perpendicular to the major-axis direction and a groove provided along the periphery of the vibrating surface. A fringe is connected to the groove as surrounding the groove, for sustaining the diaphragm against vibration. A voice-coil bobbin is connected to the diaphragm. A voice coil is wound around the voice-coil bobbin. Hook suspensions are provided at both ends of the voice coil in the major-axis direction to support the voice coil against vibration occurring when a magnetic circuit applies fluxes to the voice coil.

Abstract: A connecting device for connecting a sound producing device to an electronic equipment has a connector secured to the sound producing device, and having a pair of elastic contacts and an opening. A slider is provided to be inserted in the connector from the opening, and provided to press the elastic contacts of the connector against terminals of a substrate inserted in the connector from the opening.

Abstract: There is provided an electroacoustic transducer 1 including a base 24 made of magnetic material, a magnetic core 22 made of magnetic material and provided erectly on the base 24, a diaphragm 20 made of magnetic material and supported with a gap between the diaphragm and a forward end of the magnetic core, a magnet 25 constituting a magnetic circuit together with the base 24, the magnetic core 22 and the diaphragm 20 so as to provide a magnetostatic field, a coil 23 disposed around the magnetic core for applying an oscillating magnetic field to the magnetic circuit, a coil bobbin 30 for holding the coil 23, and a housing 10 for receiving these above-mentioned members. The coil bobbin 30 is integrally molded with the magnetic core 22 and the base member 24.

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: By forming a flange portion (16a1) protruding inward in the radial direction at an upper end portion (16a) of a voice coil (16), a coiling sectional shape of the voice coil (16) is set to a L-shape. And, the upper end portion (16a) of this voice coil (16), is bonded and fixed to a central flat portion (12b) of a diaphragm (12). Hereby, by only increasing slightly the weight of the usual voice coil having an I-shaped coiling section, the large bonding area can be obtained between the voice coil (16) and the diaphragm (12), so that separation of the voice coil (16) can be prevented. Further, since other portions of the voice coil (16) than the upper end portion (16a) thereof have the usual coil thickness, it is not necessary to expand the width of a cylindrical magnetic gap G in a magnetic circuit unit (18), whereby it is prevented that electroacoustic conversion efficiency of a speaker (10) lowers.

Abstract: An electromagnetic audio transducer for SMD applications. The transducer comprises a lead frame with external terminals, which are formed into a predetermined shape. The transducer has a case with inside and outside surfaces, where the case is integrated with the lead frame to expose the external terminals at its outside surface. The transducer has solder bases formed by exposing the lead frame at the inside surface of the case. The drive section of the transducer has a coil arranged inside the case, with the coil having coil terminals, and the coil terminals are led to the solder bases for electrical connection at the inside surface of the case.

Abstract: In an electroacoustic transducer (1) having a hollow cylindrical magnet system (8) and a contact holding assembly (22), retained in an inner zone (21), for holding spring contacts (37, 38), the contact holding assembly (22) includes two preferably identical contact holding elements (23, 24) which adjoin one another along two identically shaped bounding surfaces (26, 28), and each contact holding element (23, 24) has a holding chamber (29, 30) which opens towards its bounding surface (26, 28), each holding chamber (29, 30) accommodating a spring contact (37, 38) inserted into the holding chamber (29, 30) from the side of the bounding surface (26, 28).

Abstract: The invention relates to a manufacturing process of an electrical conductor or circuit compensated for radio interferences, including those from the electrical circuit itself. An application of a semi-conductor material (2) of resistivity coefficient allowing the external surface of the conductor (1) to the electrical circuit to be maintained at a static electrical potential near to that of the conductor (1) and the random electrical discharge currents to be absorbed is made to eliminate the interface micro-discharge interference phenomena. Application in the field of HiFi, home automation, instrumentation.

Abstract: An acoustic driver has a voice coil in which adjacent turns of the coil are spaced apart. The driver is placed at one end of a foam-lined, elongated structure, such as a tube. An opposing end of the structure is, in one embodiment, enclosed by a wall that is connected to the structure by a suspension so that it moves in sympathy with the driver. In another embodiment, the structure cooperates with the acoustic driver to form one or more restrictive passageways confined around the driver's motor and an inner surface of the structure. The passageway(s) couple a volume of air in the structure to the exterior of the structure in a manner that reduces the transmission of acoustic energy without creating alternating pressure within the structure that interferes with the movement of the voice coil's diaphragm, at its maximum points of excursion.

Abstract: An audio loudspeaker comprises: an enclosure; at least two driver units mounted within the enclosure; crossover circuitry located inside the enclosure; and a plurality of input terminals located on the exterior of the enclosure. The input terminals include: first pairs of terminals for each of the driver units, each of the first pairs being connected directly to a respective one of the driver units; a second pair of second terminals having a first crossover circuit connected therebetween and normally electrically isolated from the driver units; and a third pair of third terminals having a second crossover circuit connected therebetween and normally electrically isolated from the driver units. Connector elements are used for interconnecting selected ones of said first, second and third terminals, externally of said enclosure, whereby the crossover circuits may be selectively connected in circuit between one or more of the first terminals and one or more of the driver units.

Abstract: In an electroacoustic transducer (1) having a hollow cylindrical magnet system (8) and having contact holding means (22), which are retained in the inner zone (21), for holding spring contacts (37, 38), the contact holding means (22) consist of two preferably identical contact holding elements (23, 24) which adjoin one another along two identically shaped bounding surfaces (26, 28), and each contact holding element (23, 24) has a holding chamber (29, 30) which opens towards its bounding surface (26, 28), each holding chamber (29, 30) accommodating a spring contact (37, 38) inserted into the holding chamber (29, 30) from the side of the bounding surface (26, 28).

Abstract: A microspeaker has a case, a vibrating plate, a voice coil secured to the vibrating plate. A pair of leads are embedded in one of members made of plastic. Both end portions of each of the leads are projected from the case. Each of both ends of the voice coil is secured to one of the projected end portions of each of the leads. Both the projected end portions of each of the leads are bent along a periphery of the case.

Abstract: A microspeaker has a case, a vibrating plate, a voice coil secured to the vibrating plate. A pair of leads are embedded in one of members made of plastic. Both end portions of each of the leads are projected from the case. Each of both ends of the voice coil is secured to one of the projected end portions of each of the leads. Both the projected end portions of each of the leads are bent along a periphery of the case.

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: In an apparatus (1) having an electroacoustic transducer (14) and having a printed circuit board (51) the electroacoustic transducer (14) has two terminal contact elements (36, 37) and the printed circuit board (51) has two mating contact elements (52, 53), which terminal contact elements (36, 37) have two terminal contact portions (38, 39) which are oriented parallel to the transducer axis (34) of the transducer (14) and which mating contact elements (52, 53) have two mating contact portions (56, 57) which are oriented parallel to the transducer axis (34), the terminal contact portions (38, 39) and the mating contact portions (56, 57) being held pairwise against each other in a direction transverse to the transducer axis (34) and thus forming at least parts of a retainer (72) with the aid of which the transducer (14) is secured to the printed circuit board (51).

Abstract: A moving coil transducer is produced by wrapping an electrical conductor around a thread and weaving the wrapped thread at a selected location in a cloth with an overshot region. The cloth is formed into a spider with a region of the cloth adjacent the overshot region as a perimeter of the spider. The spider is incorporated into the moving coil transducer. Electrical contact is made to a moving coil of the moving coil transducer through the electrical conductor wrapped around the thread.

Abstract: There is provided an electroacoustic transducer 1 including a base 24 made of magnetic material, a magnetic core 22 made of magnetic material and provided erectly on the base 24 a diaphragm 20 made of magnetic material and supported with a gap between the diaphragm and a forward end of the magnetic core, a magnet 25 constituting a magnetic circuit together with the base 24, the magnetic core 22 and the diaphragm 20 so as to provide a magnetostatic field, a coil 23 disposed around the magnetic core for applying an oscillating magnetic field to the magnetic circuit, a coil bobbin 30 for holding the coil 23, and a housing 10 for receiving these above-mentioned members. The coil bobbin 30 is integrally molded with the magnetic core 22 and the base member 24.

Abstract: The present invention relates to an electric acoustic converter used as a speaker or a receiver of a mobile communication device such as a portable telephone or the like. In the electric acoustic converter according to the present invention, the size reduction and thinning of the thickness of the electric acoustic converter can be promoted by providing surface-like rear surface terminals 81 and 82 on the exposed surface 33 which is a rear surface of the yoke 3.

Abstract: A moving coil transducer is produced by wrapping an electrical conductor around a thread and weaving the wrapped thread at a selected locating in a cloth with an overshot region. The cloth is formed into a spider with a region of the cloth adjacent the overshot region as a perimeter of the spider. The spider is incorporated into the moving coil transducer. Electrical contact is made to a moving coil transducer through the electrical conductor wrapped around the thread.

Abstract: Planar magnetic acoustic transducer diaphragms are formed from an electrical non-conducting membrane and metallic layer laminate by selectively removing portions of the metallic layer to create at least one electrical conductor circuit pattern and at least one passive metallic area both of which are of a predetermined size and configuration to balance modal behavior of the diaphragms when in use.

Abstract: An electromagnetic sound generator is mounted on a substrate. The electromagnetic sound generator has a case housing an electromagnet, which is formed by attaching a magnet and a coil to a yoke, and a vibrating plate disposed so as to face the electromagnet, and electrodes, to which terminals of the coil are connected, projecting outwardly of the case. The substrate has an accommodating portion conforming to the case, and substrate electrodes provided on the substrate surface at the circumference of the accommodating portion. The electromagnetic sound generator is mounted on the substrate by accommodating the case in the accommodating portion of the substrate and joining the electrodes of the electromagnetic sound generator to the substrate electrodes.

Abstract: A spacer for mounting around the outer peripheral surface of a bobbin. The spacer has first and second edge surfaces formed in a circular arc shape. Subsequent to the formation of a first coil by winding wire around the bobbin, the wire is continuously curved from a distal end portion of the first coil along the first edge surface of the spacer. After making a U-turn of substantially 180 degrees, the wire is wound to form the second coil. Upon completion of winding of the second coil, the wire is guided along the second edge surface, from an end portion of the second coil, and a second portion of the first coil is wound. The portion of the wire for connecting both of the first and second coils is free from bent corners, thus avoiding the generation of stress concentration. Also, the wire is guided by smooth and curved edge surfaces of the spacer, thus preventing damage to a coating on the wire.

Abstract: Voice coil assemblies are designed so that the solder points which connect the coil wires and the stranded wires, are connected via a separate adhesive seam to the diaphragm or the voice coil carrier. According to the invention, the solder points are placed in the adhesive seam by which the centering membrane is connected to the voice coil carrier. The first region of the centering membrane is designed to be open in the direction of the voice coil. By locating the solder points in the adhesive seam a voice coil assembly is created which is distinguished by a low design height, a good current-carrying capacity and an excellent height reproduction.

Abstract: An electroacoustic transducer includes a low density diffusing volume which supports on its periphery at least one electrically conductive circuit through which an electric signal representative of the signal to be emitted passes. Magnets are mechanically connected to the diffusing volume's periphery. The magnets provide a magnetic field whose field lines surround the conductive circuits which is positioned on the diffusing volume's periphery. Several embodiments are presented, as well as several modes of electrical connections between the circuit emitting the electrical signals and the conductive circuits.

Abstract: In an electroacoustic transducer having an outer case integral with lead terminals and a drive section including a coil disposed in the outer case with both coil terminals of the coil being led out on and connected to lands of the lead terminals, the lands are formed in approximately circular shapes.

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: A spacer for mounting around the outer peripheral surface of a bobbin. The spacer has first and second edge surfaces formed in a circular arc shape. Subsequent to the formation of a first coil by winding wire around the bobbin, the wire is continuously curved from a distal end portion of the first coil along the first edge surface of the spacer. After making a U-turn of substantially 180 degrees, the wire is wound to form the second coil. Upon completion of winding of the second coil, the wire is guided along the second edge surface, from an end portion of the second coil, and a second portion of the first coil is wound. The portion of the wire for connecting both of the first and second coils is free from bent corners, thus avoiding the generation of stress concentration. Also, the wire is guided by smooth and curved edge surfaces of the spacer, thus preventing damage to a coating on the wire.

Abstract: A tinsel cord support member 30 is formed on a gasket 24, two grooves for supporting tinsel cords 26 and conducting them from a tip end portion of the tinsel cord support member 30 up to near terminal lugs 28 are formed at predetermined intervals from each other in the tinsel cord support member, and a hollow portion 30a is provided between the two grooves formed in the tinsel cord support member 30.