Abstract: Provided is a speaker box, which includes a first damping member fixed to the housing and covering the sound outlet, and a second damping member fixed in the receiving space and fixed to the housing. The second damping member, the base and/or the cover define an extension cavity in communication with the front acoustic cavity. When the speaker produces sound, the extension cavity stabilizes frequency response variation caused by variation in the dynamic height of the air space. When the diaphragm of the speaker is at the lowest and highest positions of the air space, the variation in the final acoustic frequency response of the speaker box is always small, and the final acoustic frequency response of the speaker is also small. Thus, the intermodulation distortion of speakers in mobile devices or other thin devices can be reduced, and a sound quality of the speaker box can be improved.

Abstract: The present invention discloses a microphone module. The module comprises: a housing having a sound receiving hole; a pressing plate fixedly combined with the housing, an accommodating cavity being formed between the inner side surface of the pressing plate and the outer side surface of the housing, and the pressing plate comprising sound transmitting hole corresponding to the sound receiving hole; and an intermediate layer covering the sound receiving hole, provided on the outer or inner side surface of the housing, and corresponding to the sound receiving hole. The housing further comprises an annular protrusion having a passage, extending outwards from the outer side surface of the housing, and surrounding the sound receiving hole.

Abstract: The present invention provides an electronic device storage container for preventing unauthorized eavesdropping by an electronic device that includes active listening capabilities. The electronic device storage container includes a base, perimeter sidewalls extending upwardly therefrom to form an interior volume, and a lid hingedly affixed to one sidewall. An electronics housing is disposed within the interior volume and includes a power source operably connected to a white noise generator, a photosensor, a plurality of USB ports, an internal speaker, an external speaker, a fan, a volume control, a lid interlock switch, and one or more exterior LEDs. The housing may include layers of soundproofing material. The white noise generator emits a sound signal to prevent the microphone of the stored electronic device from recording conversations or other sounds.

Abstract: To provide a noise control system capable of generating a noise cancellation field where noise is reduced at a desired position in a space. An error scanning filter generates a noise cancellation signal using an adaptive control algorithm based on error scanning, the signal having a phase opposite to that of an acoustic signal component detected by a reference sensor. A control speaker radiates the noise cancellation signal to create a noise cancellation field near the head of a person receiving sound.

Abstract: A microphone includes a polar piece contacting with a first magnetic pole of a first permanent magnet, a yoke body annularly arranged around the polar piece through a magnetic gap G with a predetermined width, a magnetic circuit unit including a tail yoke connected to the yoke body and contacting with a second magnetic pole of the first permanent magnet, and a diaphragm unit provided with a voice coil arranged to vibrate in the magnetic gap. The second magnetic pole of the first permanent magnet contacts with one side of the tail yoke, a first magnetic pole of the second permanent magnet is disposed to contact with other side of the tail yoke, a magnetic path is produced between the second magnetic pole of the second permanent magnet and the yoke body, and the first permanent magnet and the second permanent magnet are polarized in the same sense.

Abstract: A dynamic microphone unit includes: a diaphragm that vibrates in response to received sound waves; a voice coil that is fixed to the diaphragm and vibrates together with the diaphragm; a magnetic circuit that generates a magnetic field in a magnetic gap, the voice coil being disposed in the magnetic gap; a resonator that is disposed adjacent to the obverse of the diaphragm; and a noise canceling coil that is fixed to a surface of the resonator so as to face a position of fixing the voice coil, the surface facing the diaphragm. The noise canceling coil is connected in series with the voice coil and has a winding direction different from that of the voice coil.

Abstract: A rigid, flat plate diaphragm for an acoustic device is illustrated. The internal supporting structure of the diaphragm provides a combination of torsional and translational stiffeners, which resemble a number of crossbars. These stiffeners brace and support the diaphragm motion, thus causing its response to not be adversely affected by fabrication stresses and causing it to be very similar in dynamic response to an ideal flat plate operating in a frequency range that extends well beyond the audible.

Abstract: A dynamic microphone unit has a diaphragm 5 vibrating in response to sound waves, a voice coil 6 fixed to the diaphragm 5 and vibrating in cooperation with the diaphragm 5, a magnetic circuit including a magnetic gap around the voice coil 6 and generating a magnetic field in a magnetic gap, a first air chamber 11 adjacent to the reverse of the diaphragm 5 holding an acoustic resistance therein, a second air chamber 9 behind the voice coil, and a communication passage 22 for sound waves between the first air chamber 11 and the second air chamber 9.

Abstract: A dynamic microphone unit includes: a diaphragm that vibrates in response to received sound waves; a voice coil that is fixed to the diaphragm and vibrates together with the diaphragm; a magnetic circuit that generates a magnetic field in a magnetic gap, the voice coil being disposed in the magnetic gap; a resonator that is disposed adjacent to the obverse of the diaphragm; and a noise canceling coil that is fixed to a surface of the resonator so as to face a position of fixing the voice coil, the surface facing the diaphragm. The noise canceling coil is connected in series with the voice coil and has a winding direction different from that of the voice coil.

Abstract: A dynamic microphone unit has a diaphragm 5 vibrating in response to sound waves, a voice coil 6 fixed to the diaphragm 5 and vibrating in cooperation with the diaphragm 5, a magnetic circuit including a magnetic gap around the voice coil 6 and generating a magnetic field in a magnetic gap, a first air chamber 11 adjacent to the reverse of the diaphragm 5 holding an acoustic resistance therein, a second air chamber 9 behind the voice coil, and a communication passage 22 for sound waves between the first air chamber 11 and the second air chamber 9.

Abstract: A dynamic microphone unit includes: a diaphragm 5 vibrating in response to received sound waves; a voice coil 6 fixed to the diaphragm 5 and vibrating in cooperation with the diaphragm 5; a magnetic circuit generating magnetism in a magnetic gap, the voice coil 6 being disposed in the magnetic gap; a first air chamber 15 defined adjacent to the reverse of the diaphragm 5; and a second air chamber 9 defined behind the voice coil 6, the second air chamber 9 being in communication with the first air chamber 15, a elastic thin-plate acoustic resistor 50 being disposed in the second air chamber 9 while having tensile force applied, at a position where the acoustic resistor 50 limits the volume of the second air chamber 9 and comes into contact with the voice coil 6 within a maximum displacement of the voice coil 6.

Abstract: Provided is a mobile communication terminal having an aromatic function and a terminal charger for the same. The terminal charger for charging a mobile terminal having an absorbent material disposed therein includes a charger body having a mounting space formed at one part thereof and in which the terminal is mounted; and an aromatic supply part installed in the charger body for supplying an aromatic agent into the absorbent material.

Abstract: A speaker device includes: a magnetic circuit which includes two magnetic gaps; a diaphragm which is arranged at a position passing through at least the two magnetic gaps and includes a recessed part extending in a direction substantially orthogonal with respect to an extending direction of a magnetic flux in the magnetic gaps; and a voice coil, formed into an annular shape, which includes a first parallel part extending in one direction and a second parallel part extending in a direction in parallel with the first parallel part and opposite to the first parallel part with a constant space. Particularly, the first parallel part and the second parallel part are arranged in a direction in parallel with an extending direction of the recessed part, respectively, and the first parallel part and the second parallel part are arranged in the recessed part to be positioned in the two magnetic gaps, respectively.

Abstract: Even in the case where the volume of a back air chamber is small, sounds with a low frequency (low range) can be captured by equivalently decreasing the acoustic impedance of the back air chamber. A dynamic microphone includes a microphone unit 20 that includes a diaphragm 21 having a voice coil 21a and a magnetic circuit 22 having a magnetic gap; and a microphone case 10 that supports the microphone unit 20 on one end side thereof and has the back air chamber 12a provided on the back surface side of the diaphragm 21 via an acoustic resistance material 26 therein.

Abstract: A boundary microphone, comprising: a base made of a metal; a cover made of a metal having a plurality of holes for introducing sound waves; and internal components including a microphone unit that is disposed in an internal space enclosed by the base and the cover; a first metallic part disposed on one side of the upper and lower sides of the internal components; and a second metallic part, which is disposed on other side of the upper and lower sides of the internal components and which encloses the internal components along with the first metallic part from all directions, are provided, wherein the base, the cover, the first metallic part, and the second metallic part are alternately overlapped at their peripheral portions, and wherein at least one of the first metallic part and the second metallic part is made of a metallic mesh.

Abstract: There is provided a dynamic microphone in which the output impedance does not increase and also the failure rate does not increase though using a microphone unit and a vibration detecting unit to reduce handling noise. In the dynamic microphone including a microphone unit 20 that includes a first diaphragm 24 and a first magnetic circuit 26 and delivers sound signals and a vibration detecting unit 30 that includes a second diaphragm 32 and a second magnetic circuit 33 and detects vibrations applied to a microphone case, whereby the output signal of the vibration detecting unit 30 being delivered as an opposite phase with respect to the output signal of the microphone unit 20, a field coil 41 excited by the output signal of the vibration detecting unit 30 is provided on the first magnetic circuit 26 side of the microphone unit 20.

Abstract: An armature for a receiver comprising a first and a second leg portion each having a thickness and a width and connected to each other, and a connection portion in communication with the first and second leg portions. The connection portion has a width greater than the width of the first and second leg portions individually. The connection portion reduces the stiffness of the armature and minimizes magnetic reluctance of the connection between the first and second leg portions. According to one aspect of the invention, the first and second leg portions are integrally formed with the connection portion and the connection portion includes a least a portion having a thickness less than the thickness of the first and second leg portions individually to reduce the stiffness of the armature. According to another aspect of the invention, the first and second leg portions are separately formed and attached to the connection portion in a way that reduces the stiffness of the armature.

Abstract: A bone conduction transducer suitable for use in a listening device, such as hearing aids, in-ear monitors, headphones, electronic hearing protection devices, and very small scale acoustic speakers, has an end mass assembly disposed within the housing. The end mass assembly is mounted to the acoustic assembly and operatively coupled to the motor assembly via a coupling assembly.

Abstract: There is provided a dynamic sound transducer having a diaphragm with a ridge. First and second grooves (20, 30) are arranged on a first side of the ridge in such a way that the first and second grooves cross each other.

Abstract: In a condenser microphone in which a microphone capsule and an audio output section are connected to each other via a microphone cord, strong electromagnetic waves generated by a cellular phone etc. are prevented from being transmitted by the microphone cord and intruding into the audio output section. In a condenser microphone in which a microphone capsule 10 and an audio output section 20, in which a circuit board 23 including an audio output circuit is housed in a shield case 210, are connected to each other via a microphone cord 30, of the circuit board 23, a terminal 231 connected to the microphone cord 30 is arranged on the outside of the shield case 210.

Abstract: Leakage flux is reduced particularly in a magnetic gap of a magnetic circuit to improve the sensitivity of a dynamic microphone. A dynamic microphone including a magnetic circuit unit 20 including a center pole piece 22 connected to one pole of a first permanent magnet 21 and a yoke 23 which is connected to the other pole of the first permanent magnet 21 and is arranged like a ring around the center pole piece 22 via a magnetic gap of a predetermined width, a diaphragm 10 having voice coils 13 disposed in the magnetic gap, and a resonator 40 which has a front acoustic terminal 41 and is disposed at the front of the diaphragm 10, the dynamic microphone further including a second permanent magnet 43 disposed on a part of the resonator 40 so as to face the center pole piece 22, the second permanent magnet 43 being polarized in such a way that the same poles of the first permanent magnet 21 and the second permanent magnet 22 face each other.

Abstract: An anti-eavesdropping device is described. The device comprises a receiving compartment for receiving an electronic device, a noise generator, and an EMI filter. The receiving compartment is sealable to minimize signal emissions from the interior to the exterior and from the exterior to the interior, and the noise generator is coupled with the receiving compartment and the EMI filter. The EMI filter is operatively coupled with the noise generator.

Abstract: A microphone includes first and second magnet units disposed in a head housing and spaced apart from each other in an axial direction of the head housing. The first and second magnet units generate respectively first and second magnetic fields. A response unit is mounted in the head housing, is disposed between the first and second magnet units in the axial direction, and includes a diaphragm, and a conductive wiring disposed at the diaphragm. When the diaphragm vibrates between the first and second magnet units in response to an external sound wave signal, an electrical signal corresponding to the sound wave signal is induced in the conductive wiring as a result of action of the first and second magnetic fields.

Abstract: A microphone pick-up device includes an air chamber unit disposed posteriorly of an annular cap body. A pick-up unit generates an acoustic signal in response to detected sound, and includes a yoke mounted in a front portion of the cap body, a voice coil disposed around a washer and a magnet within the yoke, a diaphragm for covering the yoke and connected to the voice coil, a sound regulating cloth attached to and disposed to surround the cap body, and a sound regulating paper disposed between a rear portion of the cap body and the air chamber unit and covering an air passage unit of the cap body. A signal filter is disposed between the rear portion of the cap body and the air chamber unit, is disposed posteriorly of the sound regulating paper, and is coupled to the voice coil for filtering noise in the acoustic signal.

Abstract: A sound recording and/or sound reproducing part loosely anchored/connected to a second part wherein the sound recording and/or sound reproducing part is levitated on a magnetic field. The sound recording and/or sound reproducing part and the second part in combination forms a first sound recording and/or sound reproducing device. The sound recording and/or sound reproducing part can be used within on or more of the following devices; a loud speaking telephone, a telephone, wireless communication equipment, a mobile phone, a Bluetooth device, a videoconference terminal, a hearing aid or active ear protection equipment.

Abstract: A mobile terminal includes a first body, a second body slidably mounted at the first body, and a fragrance emanating unit mounted at one of the first and second bodies and disposed at a portion close to a user's nose when the user performs call communication. A user can smell fragrance during call communication effectively.

Abstract: An inductor-based integrated MEMS microphone and a method of making the microphone is provided. The microphone structure includes a vibrating inductor that is suspended over another stationary inductor such that the magnetic field induced from one inductor induces an electrical potential across the other. The stationary inductor is embedded in a dielectric material that is etched out over the stationary inductor to provide the cavity over which the vibrating inductor is suspended.

Abstract: A mass is levitated with respect to a base, at least one of which is comprised of a diamagnetic material, with the levitated mass also having a permanent magnetic property. A second permanent magnet is optionally configured such that it attracts the levitation mass away from the base to overcome gravitational force on the mass, thereby suspending the mass over the surface of the base. The mass is contained in a nonmagnetic, non-shielding and optionally optically-transparent housing so as to limit its excursion within a range of levitation positions. A position measurement means such as a laser interferometer, capacitance detector, or pickup coil is configured to measure positional deviations of the mass in response to incident pressure wave, the output of which being an electronic signal representing the pressure wave.

Abstract: The present invention relates to a force sensing device, and in particular to a force sensing device for sensing an oscillating force or for application as a filter. In general terms, the invention proposes a force sensing device having a magneto electric material and a magnetic element moveable relative thereto in response to an applied force. The magneto electric material is exposed to the magnetic field of the magnetic element which has a magnetisation direction parallel to the direction of the movement.

Abstract: A condenser microphone has a conductive diaphragm 3 having an earth electrode layer 31 formed of a conductive light metal; a conductor fixed electrode 5 arranged opposite to the conductive diaphragm 3 through an air layer; an organic dielectric layer 32 formed of the organic compound provided on the boundary surface 32C side between the air layer and the conductive diaphragm 3; and a permanent electric charge layer 32A composed of ions or electrons formed in the inner portion side receding from the air layer 8side, from a middle position in the thickness direction of the organic dielectric layer 32 in the inside of the organic dielectric layer 32.

Abstract: A vibration detecting unit is arranged in an air chamber in communication with a microphone unit and changes in pressure in the air chamber caused by the vibrations of a diaphragm of the vibration detecting unit is transmitted to the back surface side of a diaphragm of the microphone unit thereby suppressing the displacement of the diaphragm caused by external vibrations.

Abstract: In an electroacoustic transducer (1) having a diaphragm (19) and having a supporting means (25) for the diaphragm (19) the diaphragm (19) and the supporting structure (25) form a single part, and an annular outer zone (24) of the diaphragm (19) and a first annular zone (26) of the supporting structure (25) adjoin one another smoothly.

Abstract: An assembly housing for accepting an electroacoustical transducer having a rear face with terminal pins proceeding therefrom, contact surfaces thereon, and at least one sound admission opening, is formed by an acceptor plate which is disposed adjacent the rear face of the electroacoustical transducer, and a covering cap which is fitted over the radial edge of the acceptor plate. The acceptor plate has respective openings therein proceeding completely through the acceptor plate which respectively receive the terminal pins, and has blind holes therein which respectively receive springs in registration with the electrical contact surfaces of the electroacoustical transducer. The acceptor plate has a radially-proceeding sound admission channel therein, with one end in registration with the sound admission opening in the rear face of the transducer, and an opposite end in registration with a sound admission opening in the covering cap.

Abstract: A pick-up device includes a front cover, a diaphragm incorporating a voice coil disposed posteriorly of the front cover, a front flux shield plate disposed posteriorly of the diaphragm and having a first hole, a magnet disposed at a back side of the front flux shield plate and having a second hole aligned with the first hole, a yoke disposed around the front flux shield plate and the magnet and confining a first air passage with both the front flux shield plate and the magnet, a rear flux shield plate disposed at the back sides of the magnet and the yoke and having a threaded third hole which is aligned with the second hole, the rear flux shield plate further having a second air passage which is communicated with the first air passage, an encapsulation to encompass the yoke and the rear flux shield plate, a rear cap to encompass the encapsulation and the rear flux shield plate, a screw rod passing through the rear cap and threadedly engaged with the third hole, thereby closing the third hole, and a high frequ

Abstract: A microphone transducer includes a magnet, a yoke disposed around the magnet, an inner insulator provided between the magnet and the yoke, an outer insulator provided around the yoke, a voice coil provided around an upper portion of the magnet, and a diaphragm having a central convex portion and an annular convex portion which encircles the central convex portion. The central convex portion has a periphery which is attached to the voice coil. The annular convex portion has a periphery which is attached to the outer insulator. A noise reducing member includes a rigid annular mounting plate which is attached to the periphery of the annular convex portion of the diaphragm, and a flexible cushioning ring having a top side attached to the mounting plate and a bottom side attached to the outer insulator.

Abstract: In a close talking microphone device in use for a communication apparatus for a motorcycle, a front casing 2 and a back casing 3 are provided with a front opening 7 and a back opening respectively. Elastic supporting members 5, 6 and 15 for a microphone 4 are accommodated through a first and second filters 11 and 12 between the front casing 2 and the back casing 3 and formed thereon with first, second and third through holes 13, 14 and 16 connected to each other. The microphone 4 is engaged within the third through hole to form a pair of sound paths at each front and back side of the microphone 4. The front sound path is smaller in volume than the back sound path and the opening size of the through hole 13 is defined narrower than that of the through hole 14, whereby a sideward noise diverges into two courses "a" and "b" and the diverging noises reaching the microphone are cancelled by each other so as to be dampened.

Abstract: The invention relates to a supporting structure of a diaphragm of a dynamic microphone. A viscous liquid is filled in the inside of the peripheral edge portion of the edge portion of the diaphragm, thereby supporting the diaphragm to the casing through the viscous liquid. On the other hand, the peripheral edge portion of the diaphragm is fixed to the casing by a fixed ring and the viscous liquid is filled between the fixed ring and the front and rear surfaces of the peripheral edge portion of the edge portion of the diaphragm. With the above structure, by supporting the diaphragm to the casing through the viscous liquid, the liquid also moves in accordance with the vibration of the diaphragm without blocking the vibration of the diaphragm. Therefore, it is possible to certainly prevent the occurrence of the resonance at a special frequency.

Abstract: There is a dynamic microphone comprising: a diaphragm which can vibrate by an acoustic wave and a voice coil which is joined to the diaphragm so as to transverse a magnetic field formed by the magnet and can vibrate integratedly with the diaphragm, wherein a number of peripheral treatment agents for damping are coated in a dot shape or a discontinuous stripe shape at intervals onto either one of the front surface and the back surface of the portion of the diaphragm excluding the center dome. With the above construction, a change in stiffness of the diaphragm by the peripheral treatment agents is extremely reduced, it is prevented that the diaphragm resonates at a special frquency, a sudden attenuation of the low frequency limit is prevented, and a low sound can be also certainly collected.

Abstract: A microphone has a diaphragm having a dome central portion being formed of laminate of a thin layer of synthetic resinous material and a thin wire mesh contacting the central portion. As surrounding attachment portion is provided so that the diaphragm is free to vibrate in a plane perpendicular to itself. An annular voice coil is attached to and circumscribes the central portion on the concave side of the diaphragm and a fixed permanent magnet is disposed within the voice coil. The magnet is formed of neodymium iron-boron and the voice coil has an internal diameter greater than its thickness and the thickness of the magnet is greater than the thickness of the voice coil. A method of forming the described microphone is also set forth.

Abstract: A pressure gradient pickup, particularly a capacitor microphone or a dynamic microphone, has a diaphragm arranged in a housing and at least one sound entry opening which conducts the sound to the rear side of the diaphragm. Acoustically acting phase-shifting sections are connected in the interior of the housing to the at least one sound entry opening. The at least one sound entry opening is located at least approximately in the same plane as the diaphragm and is preferably arranged concentrically relative to the diaphragm edge.

Abstract: A displacement sensor for an electrocardiograph attaches a permanent magnet chip directly on a living body, and movement or vibration of the living body is sensed by measuring flux by said magnet. The electrocardiograph has a magnet assembly having an adhesive film mounting a permanent magnet at the center of the film supported on a bottom ring which has a plurality of upright walls with jaws, for detachably engaging the magnet assembly with a sensor body. The sensor body has saturable inductors which are placed in flux by said magnet and are coupled with a process circuit having an astable multivibrator with a collector load by said saturable inductors and a low-pass filter connected to the output of the multivibrator. The magnet assembly is first adhered on a living body, then, the sensor body is engaged with the same by engaging said jaws with a projection on the sensor body, then, the process circuit provides an output signal reflecting the movement of a living body.

Abstract: A dome-shaped acoustic motor diaphragm having a core of aluminum foil in the form of a spider web configuration resulting in the dome shape, the diaphragm being in the form of an annular semi-dome outer diaphragm part and a dome-shaped cylindrical inner diaphragm part. The spider web core also enables a wide variety of diaphragm shapes to be possible. A voice coil bobbin is passed through a lower diaphragm layer and unto the underside of an upper diaphram layer via the core which more or less is the greatest height of the same core in the region of the outer diaphragm part, thereby resulting in a highly effective bonding strength between these parts. Damping is accomplished by means of a cylindrical bellows having a height representing the maximum excursion distance of the movable parts. A bobbin guide positioned within the bobbin and bonded to the inner face of the lower magnetic pole piece prevents the bobbin and voice coil in the annular air gap from contacting the pole pieces.

Abstract: A displacement sensor for a living body provides an improved stethoscope and/or cardiogram. The apparatus has a diaphragm which is placed on the surface of a living body, a permanent magnet located on the diaphragm, an inductor arrangement located adjacent to the permanent magnet so that the saturable inductor changes its inductance according to movement or vibration of the magnet, a processor circuit which processes the inductance variation in the inductors to provide an electrical output signal for visual display and recording purposes, and a hollow sound tube which introduces an acoustic vibration sound of the diaphragm to the ears of a doctor. The present apparatus provides not only acoustic sound output but also visual display and a printed copy as a mechanocardiogram sensor.