Results 91 to 100 of about 582 (127)
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Flame retardant diaphragm for acoustic transducers
The Journal of the Acoustical Society of America, 1986A flame retardant diaphragm for speakers, etc. comprises an admixture of natural fibers and inorganic fibers. The admixture is impregnated with a thermosetting resin and an organic bromine compound, and heat-treated under pressure. The organic bromine compound acts as a flame retarder.
Fumio Kawahara +2 more
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Diaphragm for acoustic equipment
The Journal of the Acoustical Society of America, 1993A diaphragm for acoustic equipment wherein a surface-hardened layer of SiC film is formed on the surface of the diaphragm substrate comprising a completely carbonaceous film. Thus, the diaphragm for acoustic equipment having superior acoustic characteristics by utilizing the superior physical characteristics of carbon can be used effectively as a ...
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Method for producing a diaphragm for acoustic appliances
The Journal of the Acoustical Society of America, 1990In production of a diaphragm for acoustic appliances, a thin metal layer is formed on a substrate by means of vapor phase development so that the density of the product should be high enough for generating high sound pressure even in the high frequency range.
Hoshi Toshiharu, Kunio Suzuki
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Acoustic diaphragm with polyurethane elastomer coating
The Journal of the Acoustical Society of America, 1979An acoustic diaphragm has a substrate of either a hard resin film or cloth of an organic material, and at least one side of the substrate is laid with a polyurethane elastomer layer. In the case of a cloth substrate, the cloth is optionally metallized by evaporation deposition of Al or Ti and/or impregnated with a thermosetting resin.
Mitsuru Ieki, Hirotoshi Niguchi
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Experimental validation of diaphragms for acoustic micro-transducers
2015 Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS (DTIP), 2015The electro-mechanical characterization of MEMS diaphragms for acoustic applications is introduced in this paper. The samples under test are fabricated with the 0.35 AMS CMOS process with front-side surface etching post-process. The goals of the experimental activities are to verify the performances and repeatability of fabrication process and to ...
Esteves, J. +5 more
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Diaphragm for acoustic instruments and method of manufacturing the same
The Journal of the Acoustical Society of America, 1983A honeycomb shaped diaphragm for use in acoustic instruments such as speakers is manufactured by kneading a mixture of flaky graphite powder and thermoplastic resin, preferably polyvinyl chloride, rolling the mixture into a plate, forming honeycomb recesses in the plate, and mating two recessed plates with each other so that the corresponding recesses ...
Tsunehiro Tsukagoshi, Isao Yamamuro
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Diaphragm design for a bender type acoustic sensor
The Journal of the Acoustical Society of America, 1985An omnidirectional acoustic sensor has an air-backed diaphragm in a unit which has a central axis and is mounted so as to be responsive to acoustic pressure waves. A piezoelectric ceramic disc is attached to each face of the diaphragm. This combination forms a sensor unit whose acoustical and capacitive sensitivities are relatively independent of ...
Kenneth N. Barnard, Robert G. Dunn
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A novel acoustic sensor based on a PP/PET diaphragm [PDF]
2015 Opto-Electronics and Communications Conference (OECC), 2015 We propose and demonstrate a polypropylene/poly (ethylene terephthalate) PP/PET based Michelson interferometer for acoustic sensing. It is realized by two beams of light, reflected into optical fiber collimators from both sides of the PP/PET film.
Ping Lu, Li Liu, Hao Liao, Shun Wang
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Fabrication of circular diaphragm for piezoelectric acoustic devices
18th IEEE International Conference on Micro Electro Mechanical Systems, 2005. MEMS 2005., 2005This paper describes a fabrication method of a circular diaphragm using boron etching stop method. It is applied to acoustic transducers such as microphones or microspeakers and so on. The sensitivity is expected to be increased with the circular diaphragm through the simulation results to compare with a general rectangular diaphragm.
Woon Seob Lee +4 more
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Acoustical Impedance of Thin Diaphragms
The Journal of the Acoustical Society of America, 1967Differential equation describing the deflection η of a thin circular diaphragm, loaded with a complex specific acoustical impedance per unit area is solved. Then the total acoustical impedance Za of the diaphragm defined by 1/Za = jω∫∫ηdS/p is calculated, where p is the acoustic pressure, and dS element of area.
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