Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1988-08-08
1990-11-13
Fuller, Benjamin R.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181135, 381 686, 381 69, 381188, 381205, H04R 2502
Patent
active
049695347
ABSTRACT:
The casing of a hearing aid can be acoustically dampened and its receiver is less likely to amplify noise stemming from vibrations of the casing when the casing is lined with a viscoelastic material. The viscoelastic lining can be applied by laying a viscoelastic layer across the rim of the casing and drawing a vacuum at the sound-communicating orifice of the casing until the viscoelastic is drawn tightly against the interior of the casing. A preferred viscoelastic layer has at one surface a substance such as fibers or beads that will form temporary bridges to permit an air to be evacuated between the viscoelastic layer and a casing to which it is applied. When the deposited viscoelastic is tacky at room temperature, the components of the hearing aid can be positioned simply by pressing them into the viscoelastic material, thus making the assembly easier than prior methods of assembling tiny hearing aids.
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3M Product Information Bulletin, 70-0702-0235-6(18.05)CFD257A.
Chamberlin Davis W.
Kolpe Vasant V.
Oliveira Robert J.
Fuller Benjamin R.
Kirn Walter N.
Lilly James V.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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