Abstract: A speaker of the present invention includes the following: a diaphragm that includes an inner periphery coupled to a voice coil, and a corrugation provided at the intermediate position between the inner periphery and an outer periphery; a speaker edge for supporting the outer periphery of the diaphragm; and a damping member attached to an outer peripheral part of the diaphragm outside the vicinity of an outer periphery of the corrugation. The effective vibration area of an inner peripheral part of the diaphragm inside an inner periphery of the corrugation is substantially half or less of the total effective vibration area. The damping member is configured as a damping portion by extending an overlap portion of the speaker edge overlapping with the diaphragm to the vicinity of the outer periphery of the corrugation.

Abstract: Silicon and glass micromachined (MEMS) acoustic sensors incorporating trapped-liquid architectures are disclosed. The trapped liquid serves as an acoustic transmission medium allowing the input port to the system to be physically separated from the sensing location. The trapped liquid interacts with a conductive, flexible sensing membrane. Sound pressure waves enter the trapped liquid through an input membrane, travel to the sensing membrane, and excite vibrations of the sensing membrane. The vibrations of the sensing membrane are measured using on-chip capacitive sensing. The capacitive sensing structure is formed by the conductive sensing membrane and a fixed conducting top electrode. As the gap between the conductive sensing membrane and the fixed top electrode varies, the capacitance varies, leading to an electrical signal which is the electrical output of the system.

Abstract: A phase plug comprises a body having an input side for receiving acoustic waves and an output side for transmitting acoustic waves, the body including a plurality of channels extending from the input side to the output side for propagating acoustic waves through the body. The input side comprises an input surface which includes a plurality of slots constituting entrances for the channels, each slot being arranged in a substantially radial orientation on the input surface about a central axis extending through the input surface. Substantially the entire input surface situated between the slots is concave and substantially part of a sphere or an ellipsoid in shape.

Abstract: A loudspeaker system includes a loudspeaker enclosure having an inside space, a loudspeaker provided on the loudspeaker enclosure, a first diaphragm which has one of ends fixed to a surface of the loudspeaker enclosure and the other end, a second diaphragm which has one of ends fixed to the surface of the loudspeaker enclosure and the other end, a coupling portion having an elasticity, and coupling the other end of the first diaphragm to the other end of the second diaphragm, an opening structure provided in the surface of the loudspeaker enclosure, and a sealing member provided to a portion among the first and second diaphragms, the coupling portion and an edge part of the opening structure, and closing the inside space to hold an airtightness of the loudspeaker enclosure in a state that the first and second diaphragms can be vibrated.

Abstract: A combined headphone set including a speaker assembly. The headphone set includes a headband having a speaker headphone on opposing ends of the headband. Each of the speaker headphones includes an exterior speaker for public listening and an interior speaker for personal listening by the user. One of the speaker headphones includes switching means for listening to the interior speaker or to the exterior speaker or to the interior and exterior speakers simultaneously from each of the speaker headphones. Each of the speaker headphones includes an audio signal wire connected from an output jack of an audio device to the speaker headphones.

Abstract: A dual-frequency coaxial earphone includes a frame, a shared yoke, a high frequency speaker part, and a low frequency speaker part. The high frequency speaker part and the low frequency speaker part are coaxially arranged at inside and outside of the shared yoke, and are coaxial with a central opening of the frame. Further, a permanent magnet of the higher frequency speaker part is contrary, in polarity, to an annular magnet of the low frequency speaker part. Therefore, acoustic frequency of the low frequency speaker part can be phase-countered by passing thereof through an acoustic annular recess, so that the acoustic frequency of the low frequency speaker part has the same phase as the acoustic frequency of the high frequency speaker part and both then are output synchronally. The high frequency speaker part and the low frequency speaker part can then be separated, in acoustic frequency, from each other.

Abstract: There is provided an acoustic transducer which is reduced in size and which can generate an acoustic emission having a low frequency. The acoustic transducer of the present invention includes: a plurality of bending vibration modules 7 each of which is constructed of at least one bending vibrator made of at least one plate-shaped piezoelectric vibrator and at least one vibration plate; a plurality of support members 9 each of which supports each of bending vibration modules 7; and end plates which close both end portions of the acoustic transducer. The plurality of bending vibration modules 7 are arranged in a shape of a cylinder. Each of support members 9 is extended radially from the center of bending vibration modules 7 that are arranged in a shape of a cylinder and is joined to an end portion of each of the vibration plates of bending vibration modules 7 adjacent to each other. Further, a part of support members 9 has a cutout portion formed at an end portion thereof.

Abstract: An improved structure of a speaker comprises a speaker frame disposed with a yoke at a lower end, the yoke is disposed with a magnet that is sleeved with a voice coil pipe; a lower damper is sleeved onto the voice coil pipe through a hole, with an outer edge of the damper attached to the outer edge of the bottom inside the speaker frame; a washer is overlapped at the outer edge of the lower damper, then an upper damper is sleeved onto the voice coil pipe through a hole, with its outer edge attached to the washer; two cones are hooked up and attached to each other with a hole of the two cones sleeved onto the voice coil pipe, and an outer edge of a cone surround is attached to a rim of the speaker frame to form the improved structure of the speaker.

Abstract: A system and method for reducing baffle vibration includes balancing an inertial force generated by two or more moving diaphragms and balancing an acoustic pressure acting on a housing supporting the two or more moving diaphragms such that a net force acting on the baffle is substantially zero. The acoustic force acting on the housing may be balanced independently of the inertial force balance. In another configuration, the acoustic force acting on the housing may be balanced by a non-zero net inertial force.

Abstract: A biplane line array speaker includes a line array of tweeters mounted substantially directly in front of a line array of woofers. The tweeter line array is arcuately shaped to provide controlled vertical dispersion above and below the boundaries of the speaker cabinet. The woofers are displaced from the tweeters in stepped manner. The speaker cabinet is a rectangular box, allowing efficient wall mounting in single or multiple unit columns. In multiple unit columns, the individual units acoustically couple to each other.

Abstract: A flexible speaker structure, includes, a first electret film having a first surface, a second electret film having a second surface, a conductive film positioned between the first electret and the second electret, a first spacer disposed on the first surface for supporting a first electrode, and a second spacer disposed on the second surface for supporting a second electrode. A first interior angle is defined by the first electret and the first spacer, and the first interior angle is between 60 to 80 degrees.

Abstract: A loudspeaker system includes an enclosure having an open end defining a plane, a baffle, a loudspeaker operating in the 4 kHz to 10 kHz range, and a device, preferably a ribbed portion having a plurality of grooves, coupled to the baffle for modifying the spectral profile of the projected sound waves. The baffle includes first and second angled surfaces each oriented at an oblique angle with respect to the plane. The speaker is coupled to the first angled surface and the ribbed portion is coupled to the baffle along the intersection of the first angled surface and the second angled surface. When mounted in a wall or ceiling, the system projects a sound field substantially indistinguishable from that of a loudspeaker located within the listener's listening plane. The baffle can also have acoustic damping material attached thereto, with grooves formed therein, to prevent reflections of 4 kHz to 10 kHz sound.

Abstract: A loudspeaker including a frame and a toroidal magnet that is affixed to the rear of the frame. The toroidal magnet has a central passageway that opens into the frame. A cap is affixed to the rear of the magnet and closes the central passageway. A guide rod is affixed to the cap and projects forwardly from the cap into the central passageway. A tubular former is slidably positioned upon the guide rod. A voice coil is wound about, and is affixed to, the tubular former. A driver plate is affixed to the front of the tubular former. A resilient surround connects the periphery of the driver plate to the front of the frame. A suspension assembly resiliently connects the tubular former to the frame and has a pair of conical diaphragms that are secured together so as to form a bellows. A spider connects the bellows to the frame and another spider connects the bellows to the tubular former.

Abstract: A microphone unit (1) has a first vibration plate. A support member (6) supports the microphone unit (1). A second vibration plate (5) is fixed to the support member (6) at a predetermined distance from the first vibration plate. An armoring body (2) covers the microphone unit (1), the support member (6) and the second vibration plate (5). A space surrounded by the support member (6), the first vibration plate and the second vibration plate (5) is a closed space (S1) with air kept therein.

Abstract: A long and narrow loudspeaker on an entire wall gives off a cylindrical wave, which covers the entire room. Extra loudspeakers fixed at an angle against the wall will be heard in another direction, producing angle stereo independent of where one is in the room. Electro-dynamic loudspeakers are made of long plates of iron with air gapes between them where magnetic fields are produced. In the air gaps are strips, which conduct the sound currents. The strips influence directly one or more membranes. The magnetic field can be produced by permanent magnets, electromagnets or through concentration of geomagnetic fields. Long loudspeakers, which use other forces such as electrostatic forces, only need to be made for small sound pressure at the membrane.

Abstract: The present invention relates to dual-diaphragm electroacoustic transducers wherein a common magnetic flux path comprises first and second magnetic gaps and a magnet assembly. The invention may provide a miniature transducer with a compact magnetic flux path of improved performance. Electroacoustic transducers in accordance with the invention may comprise a small number of separate parts and provide good acoustic conversion efficiency in a miniature or compact housing.

Abstract: A piezoelectric micro speaker and a method of manufacturing the same are provided. The piezoelectric micro speaker includes a substrate having a cavity formed therein and a diaphragm that is disposed on the substrate that overlaps the cavity. A plurality of first vibrating membranes having concentric annular ring shapes are disposed in a first region of the diaphragm corresponding to a center of the cavity. A second vibrating membrane including a different material from that of the first vibrating membranes is formed in the second region of the diaphragm corresponding to an edge of the cavity. A piezoelectric actuator for vibrating the first vibrating membranes is formed on and between the concentric annular rings of the first vibrating membranes.

Abstract: A system and method for achieving extended low-frequency response and increased low-frequency sound pressure output capability in a loudspeaker system is provided. The system and method comprise mounting a low-frequency driver in a ported box, tuning the ported box to a sufficiently low frequency so as to result in a frequency response that can be modeled substantially as a second-order response, and equalizing the response of said driver-box combination with a second-order biquadratic filter function to achieve the desired frequency response characteristic.

Abstract: A loudspeaker includes a frame and a toroidal magnet that is affixed to the rear of the frame. The toroidal magnet has a central passageway that opens into the frame. A cap is affixed to the rear of the magnet and closes the central passageway. A guide rod is affixed to the cap and projects forwardly from the cap into the central passageway. A tubular former is slidably positioned upon the guide rod. A voice coil is wound about, and is affixed to, the tubular former. A forward cone has a narrow, rear end that is affixed to the tubular former and a wide, front end that is affixed to the front of the frame. A rearward cone has a narrow, forward end with a central opening that loosely receives the rear end of the forward cone. The rearward cone also has a wide, rearward end that is affixed to the frame rearwardly of the front end of the forward cone. A forward spider is affixed to the forward end of the rearward cone and is affixed to the rear of the frame.

Abstract: Front to back linear arrays of loudspeakers provide a sound field compressed both vertical and horizontally with the horizontal directivity patter exhibiting a cardioid shape. The problem addressed is improving the horizontal directivity of linear arrays. A linear array of bass units is placed behind a linear array of mid to high frequency range devices to improve horizontal directivity. The first and second linear arrays are placed back to front, oriented to radiate in a forward direction and spaced by a known distance “d”. The distance “d” may be selected to determine the degree of narrowing of the cardioid pattern sound field generated. Greater directivity is also achieved by adding additional linear arrays of bass units behind the second array. The upper frequency knee of the bass unit arrays must overlap the lower frequency knee of the mid/high-frequency unit array.

Abstract: A loudspeaker of improved construction includes a frame and a toroidal magnet that is affixed to the rear of the frame. The toroidal magnet has a central passageway that opens into the frame. A cap is affixed to the rear of the magnet and closes the central passageway. A guide rod is affixed to the cap and projects forwardly from the cap into the central passageway. A tubular former is slidably positioned upon the guide rod. A voice coil is wound about, and is affixed to, the tubular former. A forward cone has a narrow, rear end that is affixed to the tubular former and a wide, front end that is affixed to the front of the frame. A rearward cone has a narrow, rearward end with a central opening that loosely receives the tubular former between the rear of the frame and the rear end of the forward cone. The rearward cone also has a wide, forward end that is affixed to the frame rearwardly of the front end of the forward cone.

Abstract: The present invention provides a speaker apparatus and reproducing apparatus with no limitation on their listening areas. The apparatus includes; the housing 2 substantially in the shape of a spheroid; the left speaker 5A, which is attached to the left end of the long side of the housing 2 such that the left speaker 5A faces outwardly of the housing 2; and the right speaker 5B, which is attached to the right end of the long side of the housing 2 such that the right speaker 5B faces outwardly of the housing 2. Therefore, the left speaker 5A and the right speaker 5B are approximately equivalent to a point sound source, and the sound from the left speaker 5A and the right speaker 5B smoothly radiates from the housing 2 in every direction. Thus, a listener can have good quality of sound from anywhere around the housing.

Abstract: An earphone with a sound guiding tube is provided. The sound guiding tube has an external chamber beside the ear. Compared with a conventional earphone which transmits sound directly into the ear, the earphone of the present invention has a external chamber which forms sound field outside the ear and then transmits the sound into the ear through a sound guiding tube in a particular angle. The earphone of the invention is suitable for stereo sound source or multiple-channel sound sources and will reduce damage caused by wearing the earphone for a long time.

Abstract: A push-pull type speaker device and a method of manufacturing the same are provided. The speaker device includes a frame, a permanent magnet installed within the frame using a fixing device, a first diaphragm and a second diaphragm installed in opposite end portions of the frame, a pair of electromagnets, respectively corresponding to the first and second diaphragm, each installed at a distance from the permanent magnet,; and a power source driver for supplying current to the pair of electromagnets, wherein a winding direction of each electromagnet is formed such that, when current is provided from the power source driver to each of the electromagnets, the pair of electromagnets have an opposite magnetic flux direction.

Abstract: An audio transducer for use in a loudspeaker system. The transducer includes a rigid base, a pair of flexible, curved diaphragms and each diaphragm having a distal end and a proximal end. The curved diaphragms form hemi-cylindrical lobes being substantially tangent to one another at their proximal ends and are attached to energy absorbent dampers at their distal ends. The transducers can be employed in a line array as part of the loudspeaker system as well as some of the transducers facing forward while others rearward and, in doing so, their amplitudes and phases can be adjusted for fine tailoring the geometric coverage of acoustic energy radiating from the loudspeaker system.

Abstract: An improved-fidelity speaker system is presented. The sound system includes a frame and a pair of matching speakers. The frame is formed to hold a first speaker and a second speaker, each having a front side, a back side, and central axis. When attached with the frame, the two speakers are substantially aligned along their central axes in a configuration selected from a group consisting of being mounted in the frame such that the front sides of the speakers are facing away from each other, and being mounted in the frame such that the front sides of the speakers are facing towards each other. When the speakers are operated in unison, a sound wave is generated and pushed outward from the frame and approximately radially from the central axes of the speakers in up to 360 degrees, expanding outward about a plane approximately perpendicular to the central axes.

Abstract: A compound loudspeaker comprises an acoustically radiating first diaphragm and an acoustically radiating second diaphragm. The first and second diaphragms are substantially coaxial and at least part of the second diaphragm is situated radially outwards of the first diaphragm. There is a gap situated between the first and second diaphragms, and a seal is provided in the gap, thereby preventing or hindering the passage of air through the gap. By providing the seal, the invention solves the problem of audible turbulent airflow through the gap.

Abstract: A speaker having an improved sound-radiating function to both directions is provided. The speaker includes a magnetic circuit unit, a voice coil, and an auxiliary vibrating plate and a primary vibrating plate sequentially arranged from a forward direction. The voice coil vibrates toward a backward direction and a forward direction due to interaction with the magnetic circuit unit. The auxiliary vibrating plate is cone-shaped and has a damping function. The primary vibrating plate is also cone-shaped. Central necks of the primary vibrating plate and the auxiliary vibrating plate are fixed on the voice coil, respectively. The auxiliary vibrating plate is enlarged toward a forward direction and the primary vibrating plate is enlarged toward a backward direction.

Abstract: An electro-acoustic transducer includes a first electro-acoustic transduction unit. The first electro-acoustic transduction unit includes an acoustic radiation plate which radiates a sound wave, a bending vibration plate including a vibrator, and a first coupling member which couples an edge portion of the acoustic radiation plate with an edge portion of the bending vibration plate together.

Abstract: An electro-acoustic transducer includes a magnet assembly having a first magnetic flux gap and a second magnetic flux gap. A first voice coil is positioned in the first magnetic flux gap. A first diaphragm is mechanically coupled to the first voice coil and to a frame. The first voice coil moves the first diaphragm in a first direction in response to receiving a first input signal. A second voice coil is positioned in the second magnetic flux gap. A second diaphragm is mechanically coupled to the second voice coil and to the frame. The second voice coil moves the second diaphragm in a second direction that is substantially opposite to the first direction in response to receiving a second input signal. The movement of the second diaphragm reduces a vibration imparted to the frame by the movement of the first diaphragm.

Abstract: A composite loudspeaker has a first loudspeaker and a second loudspeaker. The first loudspeaker has a first frame and a first voice coil, and the second loudspeaker has a second frame stacked on the first loudspeaker and a second voice coil. The first frame has first external connecting sections that are connected to respective terminals of the first voice coil. The second frame has second external connecting sections that are connected to terminals of second voice coil. The first external connecting sections and the second external connecting sections are disposed on substantially the same plane.

Abstract: A speaker apparatus is configured such that a speaker unit including a single magnetic circuit system, a plurality of vibration systems and a case is housed inside a speaker box. In the speaker unit, magnetic gaps having a magnetic field of the same magnitude are defined by a magnet holder, a magnet and a yoke in each of the vibration systems. In one vibration system and the other vibration system, voice coils are wound around voice coil bobbins in directions reverse to each other. Consequently, the vibration systems are moved in directions opposite to each other by the same force by applying the same electric signal to the voice coil in each of the vibration systems from an amplifier. Therefore, acoustic waves are radiated in the directions opposite to each other.

Abstract: A loudspeaker used mainly for mobile communication equipment such as a mobile telephone and having two loudspeaker parts provided in one frame is provided. In the loudspeaker, a yoke has a groove portion and a second voice coil disposed in this groove portion drives a second diaphragm. Since the groove portion functioning as a magnetic gap is formed by processing the yoke, variation in the magnetic gap, which conventionally occurred at the time of incorporation, is eliminated and accuracy is improved, thus stabilizing the sound pressure frequency property.

Abstract: A loudspeaker drive unit includes at least one voice coil, a diaphragm, permanent magnet element and pole piece element. The permanent magnet element and pole piece element form a magnetic circuit with a pole gap arranged to receive and interact with the voice coil. The magnetic circuit is arranged to provide a magnetic field directed radially in the pole gap. The voice coil, the diaphragm and a support structure forms a voice coil and diaphragm assembly, which is arranged to be a self-supported unit. The voice coil and diaphragm assembly is removable from the magnetic circuit as a separate unit, allowing convenient replacement of the dynamic parts of the loudspeaker drive unit.

Abstract: Provided are a low-profile loudspeaker, loudspeaker module, and electronic equipment having improved hermeticity and excellent characteristics and for use in audio equipment. The loudspeaker, loudspeaker module, and electronic equipment are structured by embedding a frame for supporting a first diaphragm in a recess, forming a fit rib for engagement with the frame in a panel for supporting a second diaphragm, or coupling the panel for supporting the second diaphragm to the second diaphragm via a combination.

Abstract: Personal communication method and apparatus, such as telephone handsets and headsets, with acoustic stray field cancellation are disclosed. The personal communications device employs an echo canceling receiver generally including two displacement sources that are not in phase formed by at least one driver, an acoustic cavity corresponding to each displacement source, and an acoustic output port corresponding to and in acoustic connection with each displacement source via the corresponding acoustic cavity such that the acoustic length between the acoustic centers of the two ports is less than the distance between the acoustic center of each port and the acoustic center of the corresponding displacement source to which the port is acoustically connected. In another embodiment, the ports may be such that both ports are located on a same side of a surface of at least one of the displacement sources.

Abstract: A single folded, expanding horn loudspeaker reproduces low frequency audible sound at high power output levels. A compact enclosure houses a plurality of identical transducers, characterized by small vibrational surface areas. The throats for each transducer into the horn are acoustically differentially spaced from the mouth of the horn. Transducer drive circuitry adjusts a drive signal for the transducers to compensate for the different impedance and propagation time to the horn mouth at each throat.

Abstract: A body device has a dual mode function and includes: a play-back mode setting unit for selecting a plurality of play-back modes such as a CD mode, an AM mode, an FM mode and so on; and a control unit for controlling the play-back mode setting unit so as to select an arbitrary one of the play-back modes in response to a predetermined operation on the front side or the rear side. When an operation to select and demand the FM mode on the rear side in a dual mode while the front side is in the AM mode, the control unit inhibits the FM mode selection on the rear side so that the AM mode on the front side may not be changed into the FM mode.

Abstract: The invention provides, in one aspect, a loudspeaker that has electrodynamically-driven piston mounted in one external wall and that has movable panels in one or more other external walls. Those panels are air-coupled to the piston, e.g., via air within the enclosure, such that vibrational motion of the piston causes the vibration of the panels, thereby, improving the overall air coupling of the piston to the external environment, e.g., the listening room. Further aspects of the invention provide an improved driver for use, e.g., in the aforementioned loudspeaker. The driver comprises a three-part piston having first and second diaphragms coupled back-to-back with one another and having a voice coil face-mounted (or front-mounted) within the second diaphragm.

Abstract: A speaker system having a first speaker, a second speaker, and a housing having a first mounting surface to which the first speaker is mounted and a second mounting surface to which the second speaker is mounted. The first mounting surface and the second mounting surface are substantially planar and abut one another to form an included angle of between 120 degrees and 140 degrees. By so arranging the mounting surfaces, the sound produced by each speaker is allowed to mix to provide a full sound.

Abstract: The invention relates to an assembly of acoustic transducers, a system and a method for receiving and reproducing sound. The assembly comprises a first acoustic transducer having a directional pattern of the shape of a figure of eight in the direction of an X axis of a XYZ coordinate system, and a second acoustic transducer placed perpendicularly relative to a first capsule and providing a directional pattern of the shape of a figure of eight in the direction of a Y axis of a XYZ coordinate system. The assembly is characterized in that it further comprises a third acoustic transducer placed perpendicularly relative to the first and second acoustic transducers, enabling the implementation of spatial sound both in a XY plane and in a XYZ plane by using these acoustic transducers placed in accordance with an axis of the axes of the XYZ coordinate system. The invention further provides a system and a method for processing signals received with the assembly.

Abstract: A receiver assembly includes a first diaphragm assembly having a diaphragm, and a second diaphragm assembly having a diaphragm. A linkage assembly is coupled to an armature of the receiver. The linkage assembly is also coupled to the first diaphragm assembly and to the second diaphragm assembly.

Abstract: In an arcuate array of speakers (100) the wind component of air motion near each speaker is converted into sound because the wind is trapped within the arc, and therefore the bass response is improved. The array acts like a single large speaker, of diameter equal to the array diameter, when radiating bass sounds. A central baffle (10) also directs the wind and contributes to converting wind into sound. A semi-circular arc can be used along with a symmetry baffle (500) that further directs the wind, so that the number of speakers required is reduced. The symmetry baffle can be the floor, on which rests a cabinet (1) embodying the arcuate array.

Abstract: A multimedia speaker headphone has a headband, two ear-covers and a control and transmission device. The ear-covers are mounted pivotally on the headband and each ear-cover has an earphone speaker and an audio speaker. The control and transmission device has a controller and a transmission apparatus. The controller is connected one of the ear-covers and has a switch to selectively switch on the earphone speakers or the audio speakers. The transmission device has at least one transmission cord having a terminal. The earphone speakers and audio speakers allow a user to listen to music with or without wearing of the multimedia speaker headphone.

Abstract: A conductive stub of a sound exciter comprises an insulating stub and at least two beams. Each beam has a positive electrode surface and a negative electrode surface. The stub is connected with a positive electrode lead and a negative electrode lead serves for being connected to an external sound source. A positive electrode conductive element and a negative electrode conductive element are embedded in the stub. Each of the positive electrode conductive element and the negative electrode conductive element has an external joint for connecting touch press ends. The touch press ends of the positive and negative electrode conductive elements are in contact with a positive and a negative electrode surface, respectively, of each beam. By above mentioned components, sound signals are transferred to each beam to excite the beams to oscillate and then emits sound.

Abstract: A microphone sensing element and a method for making the same are disclosed. The sensing element has a diaphragm and an attached electrical lead-out arm preferably made of polysilicon that are separated by an air gap from an underlying backplate region created on a conductive silicon substrate. The backplate region has acoustic holes created by removing an oxide filling in a continuous trench that surrounds hole edges and by removing oxide to form the air gap. The diaphragm is softly constrained along its edge by an elastic element that connects to a surrounding rigid polysilicon layer. The elastic element is typically a polymer such as parylene having a Young's modulus substantially less than that of the diaphragm. First and second electrodes are connected to the diaphragm through the lead-out arm and to the substrate through polysilicon via fillings, respectively, and thereby establish a variable capacitor circuit for acoustic sensing.

Abstract: A speaker system functioning as a stand capable of power supply to a mobile phone and hand-free communication and being capable of derived surround reproduction or stereo reproduction is provided. An enclosure (201), on which a mobile phone is placed, includes therein supply means (209) for supplying electric power to the mobile phone, communication means (213) for enabling hand-free communication by the mobile phone through a microphone (211), processing means for introducing signals from the mobile phone and performing a predetermined processing, and a pair of speakers (215, 215?) provided on both sides of the enclosure in a state in which back sides thereof are substantially face to each other for generating sounds based on output signals from the processing means.

Abstract: A speaker and a magnetic circuit for a speaker, in which the high quality sound is obtained, are provided using a structure which is thin, light-weight and symmetrical in the vibration direction. In three sheets of layered magnets, the first magnet of the first layer and the third magnet of the third layer are arranged in the magnetic directions which repel each other, and the polarity of second magnet of the second layer is arranged perpendicularly to the polarity of the first and third magnets of the first and third layers at the top and bottom thereof. A voice coil wound near the center of a voice coil bobbin is arranged to oppose the second magnet of the second layer of the magnetic circuit composed of the three layers, and the same vibration systems composed of the diaphragms and edges are connected to both the ends of this voice coil bobbin.

Abstract: A loudspeaker includes a box-form structure made from stiff lightweight sheet material to define a plurality of faces, at least one face of the structure forming a panel-form bending wave acoustic radiator, and an electro-acoustic vibration transducer coupled thereto to apply bending wave energy to the radiator to cause it to radiate an acoustic output when an input signal is applied to the transducer. The box-form structure is collapsible, so that the box-form structure can be stored and transported in a flat form and erected as a box when required as a loudspeaker.

Abstract: A speaker module includes a first diaphragm and a second diaphragm acoustically coupled with each other as a part of a wall forming a hermetic space with a panel. A light emitting section emits light to the panel, and the panel transmits the light to a side of the second diaphragm. The speaker module is configured to emit sound and light.