H - Electricity – 04 – R
Patent
H - Electricity
04
R
26/125, 181/22
H04R 25/02 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1326831
ABSTRACT The invention significantly reduces noise amplified by the receiver of a hearing aid by better isolating the receiver from the casing and also by better isolating the microphone from vibrations of the casing. The invention also helps to protect components of the hearing aid against damage when dropped. Briefly, the invention concerns a hearing aid having a casing containing a transducer and a viscoelastic layer adhering the transducer to the casing, which layer has, at a frequency of 1000 Hz and a temperature of 100°F (38°C), a loss factor of at least 0.5 and a shear storage modulus G' of at least 107 dynes/- cm2. Preferably the dynamic shear loss modulus G" (i.e. the product of the loss factor and the dynamic shear storage modulus G') is at least 1.5 x 107 dynes/cm2 in order to provide good isolation of the microphone. Even better isolation is achieved when the dynamic shear loss modulus G" is at least 2.5 x 107 dynes/cm2 at 1000 Hz and 38°C.
607268
Chamberlin Davis W.
Kolpe Vasant V.
Oliveira Robert J.
Hearing Components Inc.
Smart & Biggar
LandOfFree
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