242results about "Fibre diaphragms" patented technology

Disclosed herein is an acoustic diaphragm for converting electrical signals into mechanical signals to produce sounds. The acoustic diaphragm comprises carbon nanotubes or graphite nanofibers as major materials. Preferably, the carbon nanotubes or graphite nanofibers are included or dispersed in the acoustic diaphragm. Since the acoustic diaphragm has excellent physical properties in terms of elastic modulus, internal loss and strength, it can effectively achieve superior sound quality and high output in a particular frequency band as well as in a broad frequency band.

A loudspeaker cone body made of plastic includes a base carrier material and a filler material. The base carrier material is selected to optimize overall flow, weight and stiffness. The filler material may be a nanomaterial that provides for adjustment of process and acoustic related characteristics in the loudspeaker cone body that become relevant when the loudspeaker cone body is operated in a loudspeaker. Acoustic related characteristics that may be adjusted include a stiffness to weight ratio and an acoustic damping of the loudspeaker cone body. A predetermined weight percent of the filler material may be combined with the base carrier material to obtain repeatable desired acoustic related characteristics. The acoustic related characteristics may be adjusted by changing the predetermined weight percent of the filler material.

The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical / electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical / electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.

A ceiling tile adapted to be supported in an overhead opening and function as a loudspeaker. The tile is in the form of a distributed mode acoustic radiator with a transducer mounted wholly and exclusively on the radiator at a location for coupling to resonant bending wave modes so as to vibrate the radiator and cause it to resonate.

The invention aims to provide a woven / knitted fabric containing a conductive fiber preferably usable especially for a diagram for a speaker, and a diaphragm for a speaker and a speaker using the woven / knitted fabric. A woven / knitted fabric comprising a conductive fiber and a non-conductive fiber, wherein the woven / knitted fabric has a woven structure or a knitted structure of said non-conductive fiber and a continuous wiring forming a coil of the conductive fiber.

A loudspeaker diaphragm having light weight and an excellent balance between a rigidity and an internal loss, and a simple and inexpensive method for manufacturing such a diaphragm are provided. A loudspeaker diaphragm according to the present invention includes a base layer having a woven fabric of a polyethylene naphthalate fiber impregnated with a thermosetting resin, and optionally a thermoplastic resin layer and / or a thermoplastic elastomer layer. The polyethylene naphthalate fiber is preferably an untwisted fiber. A fiber / resin ratio in the base layer is preferably in the range of 60 / 40 to 80 / 20. Preferably, the thermoplastic resin layer has a finely foamed structure and an average diameter of a cell in the finely foamed structure is 10 to 60 mum.

A speaker diaphragm or a dust cap formed by injection molding a mixture at least containing a resin material and a fiber material. The speaker diaphragm or the dust cap combines the advantages of both a paper diaphragm and a resin diaphragm. The advantage of a paper diaphragm is a large degree of freedom in setting physical properties. The advantages of a resin diaphragm are being excellent in moisture resistance reliability, strength, external appearance, productivity and dimension stability.

A transparent speaker is suitable for being disposed on a display panel. The transparent speaker includes a transparent membrane, a transparent electrode plate, and spacers. Each transparent electrode plate has a plurality of openings. The display panel includes a plurality of pixels. The pixels emit optical signals. A Moire spatial period of the optical signals is less than 600 μm after the optical signals pass through the transparent speaker. When the transparent speaker is disposed on the display panel, a user is able to watch an image on the display panel through the transparent speaker without being interfered by a Moire.

The present invention provides a dome-shaped diaphragm fabricated based on a film base of polyethylene terephthalate resin film. The diaphragm includes a first vibrating part of a dome shape or a flat shape, and a second vibrating part of an annular shape. The second vibrating part includes a peripheral portion of the film base provided around a central portion of the film base. The first vibrating part includes the central portion of the film base, a thermosensitive adhesive resin film, provided on the central portion, and a fiber sheet made of a woven fabric using carbon fiber or an embossed nonwoven fabric. The fiber sheet is layered over the central portion with the thermosensitive adhesive resin film interposed therebetween.

A bobbin interconnection assembly in a moving coil loudspeaker is disclosed. The assembly includes a first coupling member fixed to a central region of a diaphragm of the loudspeaker. The assembly also includes a second coupling member that may be removably engaged to the first coupling member. The second coupling member is fixed to an inner rim of an annular damper, and to a voice coil bobbin.

A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.

A speaker diaphragm 1 includes a first diaphragm portion 5, a second diaphragm portion 6 integrally molded with the first diaphragm portion 5, and a bobbin-receiving portion 7 protruding from a back side of a connecting portion between the first diaphragm portion 5 and the second diaphragm portion 6, with one end of a voice coil bobbin 2 being bonded to the bobbin-receiving portion 7. The bobbin-receiving portion 7 includes a first extension 8 extending backwards from the first diaphragm portion 5 and a second extension 9 extending backwards from the second diaphragm portion 6. A bobbin-receiving groove 10 is defined between the first extension 8 and the second extension 9. The voice coil bobbin 2 is inserted in and bonded to the bobbin-receiving groove 10.

A diaphragm for a speaker includes two portions. The first portion is made of metallic material for producing a high frequency tone. The second portion is made of a non-metallic material for producing a low frequency tone. The first portion is joined at a first peripheral edge to a voice coil while a second peripheral edge is joined at a first peripheral edge of the second portion to form the diaphragm.

A screen-integrated speaker in which mutual interference among channels does not occur easily, a high quality sound and a wide range of frequency are ensured, flexible and light, and downsizing for storage and transport are easy owing to its easiness of rolling up and deployment under a multi-channel structure is provided. The screen-integrated speaker according to an aspect of the invention includes a screen mainly composed of a fibrous structure and an exciter mounted to the back surface of the screen. Preferably, a exciting panel is interposed between the exciter and the screen.

A vibration-sound generating device and yoke thereof are described. The vibration-sound generating device comprises a diaphragm, a vibration part comprising a magnet and a yoke, which is positioned apart from the diaphragm by a desired distance, a suspension elastically supporting the vibration part, a supporting part supporting the diaphragm and the suspension, and a voice coil electromagnetically driving the diaphragm and the vibration part. The yoke of the invention has higher specific gravity and magnetic permeability than iron. So that it can improve performance of vibration and sound device.

A smaller-sized and acoustically excellent speaker diaphragm is inexpensively provided using the mixture of a specially surface-coated woody material and a mass-producible synthetic resin.The mixture is composed of a non-chlorinated synthetic resin and a powdery cellulose material whose particle size falls within a range of from 5 μm to 500 μm. The cellulose material has been subjected to a surface treatment to enhance its affinity to the non-chlorinated synthetic resin, and 30% to 70% by weight of the cellulose material is contained in the mixture.

A molten resin is injected into a cavity together with long fibers. Opposite surfaces of the resin are solidified as a fiber-resin mixture temperature drops. These surface layers become non-foam layers. A foam layer is created between the non-foam layers. A pressure reduction process is applied to cause a spring back effect when the foam layer is created. A diaphragm having these three layers can be manufactured in an inexpensive process, but physical characteristics and appearances of the diaphragm are not sacrificed.

An electromagnetic transducer such as a tweeter audio speaker, having a very low density diaphragm constructed of a nanoporous material such as aerogel or the like. The solid aerogel diaphragm has improved rigidity and reduced susceptibility to breakup modes. The aerogel may be provided with a skin of e.g. metal, plastic, or oxide to protect it, and it may be built by filling a conventional cone. The skin may encapsulate part or all of the aerogel body's surface, and it may further encapsulate the bobbin, or even the entire voice coil assembly. The nanoporous material comprises a very large percentage of the diaphragm's overall volume, giving the diaphragm a very low overall mass density with respect to conventional diaphragms. This allows diaphragm configurations, such as solid filled spheres, which have excellent stiffness without suffering from the large mass that such shapes would mandate if constructed from conventional materials.

A flexible speaker including a retractor, a flexible speaker panel, and at least one support element is provided. The flexible speaker panel is connected to the retractor, and is capable of being rolled up and received in the retractor. The support element, capable of memorizing shape, is disposed on the flexible speaker. The support element is used for being rolled up and received in the retractor, together with the flexible speaker. When the flexible speaker panel is spread from the retractor, the support element supports the flexible speaker and keeps the flexible speaker panel being steady in a spread state, and the size of the spread region is determined by the user.

Disclosed is a loudspeaker assembly incorporating innovations resulting in an enclosure of very small volume to which is integrated a large area, shallow and lightweight acoustic diaphragm assembly capable of a natural resonant frequency of a few Hertz. This is achieved by incorporating a vacuum chamber in conjunction with a chamber containing compressed gas or vapor that acts against a movable pressure boundary of changeable area being mechanically coupled with the acoustic radiating diaphragm. In an alternative operating mode, the apparatus also serves as a passive low frequency acoustic attenuator.

A speaker diaphragm includes a fabric layer in which impregnated thermosetting resin is thermally cured, and a paper layer integrated on a rear face of this fabric layer. Fluffs of the paper layer filling stitches of the fabric layer are entangled with threads of the fabric layer from a surface of the fabric layer, and are firmly fixed by thermosetting resin. This integrates the layers in the state that the paper layer is filled in the stitches of the fabric layer. Accordingly, internal loss and Young's modulus of the speaker diaphragm can be increased. As a result, the speaker sound quality can be improved.

A loudspeaker diaphragm contains polylactic acid, and bamboo charcoal mixed in the polylactic acid. The diaphragm does not affect environment and provides a loudspeaker with high sound quality.

A planar diaphragm loudspeaker for use in a suspended ceiling grid and related methods of manufacturing are provided. The loudspeaker includes a rectangular, planar diaphragm of polymer material sized to fill an opening of the ceiling grid. The front surface of the diaphragm defines a three-dimensional, textured pattern formed by a secondary operation, such as, etching, perforating, and adhesion of granular or fiber material. The diaphragm may include an outer region about the periphery of the diaphragm having a density of at least 5 pcf and an inner region circumscribed by the outer region, thereby providing sufficient structural stiffness to the outside perimeter of the diaphragm and eliminating the need of an outer frame. The density of the inner region is at or below about 3 pcf throughout the inner region. Also, a shroud may secured to the diaphragm, in which the shroud and the diaphragm are securable in a first orientation for flush mounting or in a second orientation for tegular-drop mounting. The loudspeaker may also include a bracket rigidly attached to the diaphragm at two spaced locations in the outer region and extending across the inner region between the spaced locations.

A single end planar magnetic speaker system having at least one thin film, flexible diaphragm (72, 90) having a front side and a rear side for converting an input electrical signal into a corresponding acoustic output, the at least one diaphragm including a predetermined conductive region (76) and a predetermined non-conductive region; a magnetic structure (92) utilizing nonferite high energy magnets of a predetermined thickness wherein the magnets are each at least as wide as they are deep; the magnets having a magnetic strength wherein when compared to magnets of a ferrite type of same width as the nonferite high energy magnets but which have increased depth to yield at least nearly the same magnetic strength as the high energy magnets in the magnetic structure, doubling the depth of the high energy magnets in the magnetic structure, doubling the depth of the high energy magnets in the magnetic structure yields an increase in speaker sensitivity of at least 3 dB while the doubling the depth of the ferrite type magnet will yield a gain of less than 3 dB, and the system further includes a mounting structure coupled to the diaphragm to capture the diaphragm, to hold it in a predetermined state of tension and space it at a predetermined distance from the magnetic structure.