Arrangement to prevent the intrusion of foreign matter into an e

Details Arrangement to prevent the intrusion of foreign matter into an e Arrangement to prevent the intrusion of foreign matter into an e

1989-10-05

1990-08-28

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 686, 181130, 181135, H04R 2502

Patent

active

049532154

ABSTRACT:
In an arrangement to prevent the intrusion of foreign matter into a transducer which extends with a projection provided with an opening into a sound channel of a hearing aid, a reduced need for space as well as simpler construction, compared with the state of the art, are achieved by means of the following characterizing features: A membrane made of pore-free material is provided, which has at least one bore for the passage of sound of from a few hundredths to a few tenths of a millimeter diameter, and in which the wall thickness of the membrane is small with respect to the diameter of the bore.

REFERENCES:
patent: 3842829 (1974-10-01), Ellis
patent: 3852540 (1974-12-01), Diethelm
patent: 4879750 (1989-11-01), Nassler
Brochure "Gore-Tex (TM) PTFE-Membranen und Laminate", 1986 of W. L. Gore & Co., GmbH, Werner-v.-Braun-Str. 18, D-8011 Putzbrunn, FRG.

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