106 results about "Acoustic membrane" patented technology

An acoustic module, such as a microphone or speaker module, includes an acoustic membrane that vibrates to produce acoustic waves and an acoustic cavity through which acoustic waves produced by the membrane travel. A liquid removal mechanism removes liquid from the acoustic cavity. Such a liquid removal mechanism may include the acoustic membrane, heating elements, hydrophobic and / or hydrophilic surfaces, and so on. In some cases, the liquid removal mechanism may remove liquid from the acoustic cavity upon connection of the acoustic module and / or an associated electronic device to an external power source.

A membrane for an acoustic transducer may comprise a first layer comprising a first material, a second layer disposed on the first layer, the second layer comprising a second material that is different from the first material, and a third layer disposed on the second layer, the third layer comprising a third material that is different from the first material and the second material, the third layer configured to be coupled with a moveable coil. The first material may be a polyaryletherketone (PAEK), the second material may be acrylate, and the third material may be polyetherimide (PEI), polycarbonate (PC), or another similar material.

An acoustical absorbing membrane that may be used in removable panel finishing systems is provided. The acoustic membrane may be formed of any sound transmission loss material that possesses sound-absorbing or sound-deadening qualities. Examples of suitable materials include foil, a foil-faced asphalt material, elastomeric materials, composite laminates, a polymer film, a composite material formed of an organic bonding material and one or more types of reinforcement fibers, a cement board, a gypsum board, a gypsum / WUCS board, a dense WUCS mat, a film formed of a fiberglass reinforced resin, and / or any dense polymeric material. In at least one exemplary embodiment, the acoustic membrane may be a film formed of a loaded polymer or copolymer, such as a copolymer of ethylene-vinyl acetate loaded with barium or CaCO3. The acoustic membrane may have a density of approximately 1 lb / ft2-3 lbs / ft2 and preferably has a thickness from about 1 / 16-⅜ of an inch.

Provided is a waterproof gas-permeable membrane (1) having higher levels of both gas permeability and waterproofness than conventional ones. The waterproof gas-permeable membrane (1) includes: a non-porous resin film (2) having through holes (21a to 21g) formed to extend through the thickness of the resin film (2); and a liquid-repellent layer (3) formed on a principal surface of the resin film (2) and having openings (31) positioned in register with the through holes (21a to 21g). The through holes (21a to 21g) extend straight and have a diameter of 15 μm or less. The through holes (21a to 21g) are distributed at a hole density of 1×103 holes / cm2 or more and 1×109 holes / cm2 or less in the resin film (2). The through holes (21a to 21g) extend in oblique directions with respect to a direction perpendicular to the principal surface of the resin film (2). The through holes (21a to 21g) that extend in different oblique directions are present together.

The present invention provides a porous polytetrafluoroethylene membrane having a surface coated with a liquid-repellent agent. In this porous polytetrafluoroethylene membrane, the liquid-repellent agent is a polymer obtained by polymerization of monomers consisting essentially of CH2=CHCOOCH2CH2C6F13. This porous polytetrafluoroethylene membrane is suitable for use as a gas-permeable membrane that allows passage of gases but prevents entry of liquids and / or dust, specifically as a waterproof sound-transmitting membrane, a waterproof gas-permeable membrane, or a dustproof gas-permeable membrane.

The invention described herein is a low-mass, light-weight sound generator with particularly good performance at mid and low audio frequencies. It is expected to find principal use in applications where mass is of crucial importance. It is capable of delivering the high acoustic levels, as required for sound generation or active sound control. The present invention uses a generally planar acoustic membrane as a diaphragm, the diaphragm being in tension and attached at its outer edge to a support frame which provides a soft boundary condition to the acoustic diaphram.In a preferred embodiment, the support structure is an inflatable toroidal tube of rubber or rubber-like material. A polymer membrane is attached to the support structure by heat sealing the membrane in place. A voltage is applied to a piezoelectric bender-type actuator, which imparts axial displacement to a region of the diaphragm, causing resonance of the diaphragm in the desired frequency range.

A practice drumhead assembly including a mesh membrane held in substantially fixed relation to an acoustic membrane. The assembly preferably includes an annular tensioning ring for tensioning the mesh membrane, and an engagement member for substantially fixing the mesh membrane relative to the acoustic membrane. The tensioning ring includes a cylindrical rod with a turnbuckle that is rotated to increase the diameter of the tensioning ring.

A drumhead comprising a mesh membrane having a bottom surface and a damper contacting at least a portion of the bottom surface for improved rebound. Also, a practice drumhead assembly including the mesh membrane with a damper in contact with at least a portion of the bottom surface, held in substantially fixed relation to an acoustic membrane. The assembly preferably includes an annular tensioning ring for tensioning the mesh membrane, and an engagement member for substantially fixing the mesh membrane relative to the acoustic membrane. The tensioning ring includes a cylindrical rod with a turnbuckle that is rotated to increase the diameter of the tensioning ring.

The polymer film of the present invention has through holes extending from one principal surface of the polymer film to the other principal surface of the polymer film. The through holes are straight holes having a central axis extending straight, and have a shape in which the area of a cross-section perpendicular to the direction of the central axis increases from the one principal surface of the polymer film toward the other principal surface. This polymer film has passages in its thickness direction, has an unconventional structure, and can be used in various applications, such as in a waterproof sound-permeable membrane, in a waterproof gas-permeable membrane, and in a suction sheet. The ratio a / b of the opening diameter a of the through holes at the one principal surface to the opening diameter b of the through holes at the other principal surface is 80% or is less than 80%.

An acoustic membrane (100) comprises at least three layers with a first outer layer (101) and a second outer layer (102), wherein the first and second outer layers (101, 102) are formed by a thermoplastic elastomer, the thermoplastic elastomer forming the first outer layer and the thermoplastic elastomer forming the second outer layer are independently from each other selected from the group consisting of polyester elastomers, co-polyester elastomers, styrene block copolymers, elastic co-polyamides, thermoplastic silicones, and elastomeric polyolefins, preferably co-polyester elastomers.

The striking watch (1) includes a watch case, which is formed of a middle part (4) and a back cover (5) removably secured to the middle part, and a crystal (2) that closes the case in a sealed manner. A watch movement (20) is held inside the watch case on a plate (14). The watch movement is provided with a striking mechanism able to be actuated at determined times to produce a sound. At least one acoustic membrane (10) is arranged between the back cover (5) which includes at least one lateral aperture (6) and the plate (14) of the watch movement. This acoustic membrane is made of amorphous metal or metallic glass to radiate the sound produced by the striking mechanism towards the exterior of the case.

The present invention discloses a method for preparing a waterproof, breathable and sound-permeable film by means of lamination and compounding. According to the method, improvement is made in the longitudinal stretching of a traditional technique method; PTFE (polytetrafluoroethylene) base tapes with different longitudinal stretching rates are superposed, and the superposed PTFE base tapes are subjected to rolling, horizontal stretching, sintering and setting sequentially, so that a composite e-PTFE waterproof breathable and sound-permeable film can be finally prepared; the puncture strength and tensile strength of the waterproof, breathable and sound-permeable film are improved, and the waterproof, breathable and sound-permeable effect of the film can be improved through controlling areal density; and under the same sound-permeable effective area, when the areal density reaches a certain value, loss in sound transmission is small, and a use effect is better.

The invention provides a waterproof sound-transmitting membrane assembly capable of being normally used 100 meters underwater. The assembly comprises a first waterproof layer and a second support layer. An interval d exists between the first waterproof layer and the second support layer, the first waterproof layer comprises a waterproof section, and the diameter length of the waterproof section isD. The relative deformation amount E of the waterproof section is equal to (2d + AD) / D and is not greater than the elastic limit relative deformation amount S of the waterproof section when the waterproof section is subjected to the water pressure of 1MPa, wherein A is the relative deformation of the second support layer under the action of 1MPa water pressure. The range of the elastic limit relative deformation S of the waterproof section is 1%-30%. The first waterproof layer has the characteristics of high hydrophobicity, excellent chemical resistance, insulativity and the like, and the second support layer has relatively high elastic limit pressure and is used for providing a supporting effect for the first waterproof layer. The waterproof sound-transmitting membrane assembly can resist the influence of 1MPa (100m water pressure), and can still play a waterproof and sound-transmitting role when the water pressure is 100m underwater, so that the normal application of electronic device is ensured.

An electronic device having a composite acoustic membrane to inhibit water ingress and to allow sound transmission, is disclosed. Embodiments include an electroacoustic transducer within an encased space of a casing, and a composite acoustic membrane between the electroacoustic transducer and an acoustic port in the casing. The acoustic membrane may include a nonporous region at least partly covering the acoustic port, and a porous region to vent the electroacoustic transducer volume to the encased space and / or to an environment surrounding the casing. Other embodiments are also described and claimed.

An earplug (10, 80) for selective attenuation of sound has a body with at least one sound path. An insert (34) is housed in the body (13), which has at least one sound passage with an acoustic filter. The acoustic filter is configured to provide a specific frequency response and thus a determined attenuation of sound passing through the earplug. Means (14) is arranged at a top surface adapted to activate or deactivate the sound path. Each acoustic filter comprises an upper acoustic port (36, 37), at least one acoustic mesh (35) and / or acoustic membrane (37, 39), an acoustic chamber (41, 44) and a lower acoustic port (42, 43). An insert (34) with an acoustic filter for selective attenuation of sound is provided for use in an earplug.

A pressure equalizing assembly with a nonporous membrane traversing across an acoustic pathway defined by an opening in a housing. A breathable layer connected to the nonporous membrane may be laterally arranged to the acoustic pathway. An acoustic cavity is defined by the breathable layer and nonporous membrane. The nonporous membrane has a side facing the opening in the housing to prevent fluid or moisture from penetrating into the acoustic cavity. The breathable layer further equalizes pressure in the acoustic cavity by providing a venting layer.

The invention discloses a waterproof sound transmission membrane and a mobile phone. The waterproof sound transmission membrane comprises a base material layer, a buffering layer and a sound transmission membrane layer; the sound transmission membrane layer is laminated at the back side of the base material layer; the buffering layer comprises a first layer and a second layer connected with the first layer, a water inlet hole is formed in the first layer, a water outlet hole communicated with the water inlet hole is formed in the second layer, and a distance between an axis of the water outlet hole and the axis of the water inlet hole is greater than or equal to the sum of radius from the water flow entering direction, so that after the water enters from the water inlet hole, the water passes through passages of the water inlet hole and the water outlet hole and then flows out from the water outlet hole rather than flowing out from the water outlet hole; and therefore, the waterproof sound transmission membrane has certain buffering effect on the water pressure. In addition, the waterproof sound transmission membrane also comprises a sound transmission membrane layer, so that the sound transmission performance of the waterproof sound transmission membrane can be improved.

An inflatable speaker includes a collapsible inflatable housing and a loudspeaker, the collapsible housing includes a circumferential side wall, a first end wall, a second end wall, and a valve for inflating the collapsible inflatable housing, wherein the first end wall includes a first inner layer, a first outer layer, and a speaker support plate between them provided with an audio transmission inner sound hole, the first outer layer is provided with an outer sound hole. The loudspeaker is positioned between the first inner layer and speaker support plate, a waterproof ventilated acoustic membrane is placed to cover the loudspeaker frame, a first waterproof adhesive permanently binds the waterproof ventilated acoustic membrane and speaker support plate together, and a second waterproof adhesive permanently binds the edge portion of the outer sound hole and speaker support plate together, thus, giving the inflatable speaker a higher level of protection.

The present invention relates to a transducer device (10), comprising: an acoustic membrane (14); a piezoelectric element (12) mounted to the acoustic membrane; two oppositely arranged elastic damping elements (16a, 16h) between which a peripheral portion (22) of the acoustic membrane is sandwichably supported; and a clamp (28) having two surfaces (30a, 30b) between which the two elastic damping elements are clamped so that the two elastic damping elements are pressed together, whereby the peripheral portion of the acoustic membrane is secured between the two elastic damping elements. The present invention also relates to a method of assembling such a transducer device.

A probe (40) includes a shaft (52) on which an ultrasound element (42) is mounted. An outer sheath (64) and an acoustic membrane (66) surround the shaft and the ultrasound element such that the shaft and ultrasound element are rotatable therein. Passages (56) supply a cooling and acoustic coupling fluid to an inlet and outlet (48) adjacent the acoustic element to cool the acoustic element and fill a volume between the acoustic element and the acoustic sheath with the fluid. A balloon (90) mounted on the probe is selectively inflated in order to fix a position of the probe. A drain (94, 98) drains urine and other bodily fluids through the probe.

The invention discloses a matrix type structure of a dustproof, waterproof and sound-transmitting film of a micro electro mechanical sensor. The structure comprises a supporting layer, a dustproof andwaterproof acoustic transmission film, an adhesive, a PCB and acoustic sensors; one face of the supporting layer is adhesive and adheres to one face of the dustproof and waterproof acoustic transmission film, the other face of the dustproof and waterproof acoustic transmission film adheres to the upper surface of the PCB through the adhesive, and the acoustic sensors are installed on the lower surface of the PCB; the acoustic sensors, the support layer sound hole, the dustproof and waterproof acoustic transmission film vibration area, the adhesive sound hole and the PCB sound hole form an acoustic channel; the multiple acoustic sensors are distributed on the lower surface of the PCB in a matrix mode, so the matrix type dustproof, waterproof and sound-transmitting film structure is correspondingly formed; the waterproof film adheres to the PCB through an adhesive, and batch products can be produced at a time. The acoustic sensors are covered with the expanded polytetrafluoroethylene film formed by the highly-fibrillated ePTFE microstructure, and the structure has the insertion acoustic loss lower than 5 dB under 1 kHz and the water pressure resistance of at least one meter or above.

A composite material for producing an acoustic membrane, wherein the composite material comprises a silicone layer comprising an at least partially uncured silicone rubber and a support layer, whereinthe support layer is adjacent to the silicone layer, as well as a method of preparing such a composite material and a process for producing an acoustic membrane from such a composite material.

This laminate contains a resin film that functions as a waterproof breathable membrane and / or a waterproof sound-permeable membrane, and a separator. The resin film and the separator are bonded by anadhesive layer, and the peel surface formed when the separator is peeled off of the resin film is located between the resin film and the adhesive layer. The laminate can supply the resin film, which functions as a waterproof breathable membrane and / or a waterproof sound-permeable membrane, with a method of adhesion to an opening in a housing, and / or in a state in which the shape has a high degreeof freedom. This laminate can be supplied in the form of a wound body with excellent storability and transportability.

The invention provides a polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane and a production method thereof. The polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane comprises a polytetrafluoroethylene spun-fiber membrane and double-sided adhesive tape adhered to edges on two sides of the polytetrafluoroethylene spun-fiber membrane. The productionmethod includes: producing the polytetrafluoroethylene spun-fiber membrane through an electrostatic spinning method; producing the polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane. The microstructure of the polytetrafluoroethylene spun-fiber membrane produced through an electrostatic spinning method is characterized in that polytetrafluoroethylene spun-fibers are stacked, molecular chains on nodes among the fibers intertwine, and the microstructure is less prone to deformation when being impacted by water. The polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane produced by the polytetrafluoroethylene spun-fiber membrane is high in tensile strength, stable in structure, good in applicability and excellent in waterproof and acoustic-transmission performance, the optimal waterproof grade of the polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane is IPX6 / IPX8 (multipurpose), and the maximum loss of sounds with the frequency being 5kHz is 6dB.

An electroacoustic transducer (1) is disclosed, comprising: a ring-shaped magnetic assembly (3) that generates a magnetic field, an elastic suspension (4) connected to the magnetic assembly, a support (8) connected to the elastic suspension and supporting a coil (6) adapted to move in the magnetic field generated by the magnetic assembly, and an acoustic membrane (5) connected to the support (8) of the coil in order to vibrate and emit a sound. The magnetic assembly (3) comprises: a thin housing and support structure (7) made of non-magnetic material, and a plurality of magnets (30) with magnetic axis (A) and axial anisotropy, said magnets (30) being disposed side by side, inside said thin housing and support structure (7) that acts as bearing structure for the transducer and as containment structure for the magnets.

A sound emitter device for use on a motor vehicle comprises a casing comprising an axial wall and a bottom wall, the axial wall extending along a vertical axis from the bottom wall toward an opening opposite the bottom wall, a control circuit, an acoustic membrane that closes the opening of the casing and that is provided on its lower face with excitation means controlled by the control circuit a peripheral rim that is arranged in the opening, the external peripheral edge of the acoustic membrane being mounted to bear on the peripheral rim, a secondary wall that is made in one piece with the peripheral rim and that is bent toward the peripheral rim so as to retain the acoustic membrane by clamping its external peripheral edge between the peripheral rim and the secondary wall.