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Soluble Glued Connection of Faceplate and Shell in Hearing Instruments

IP.com Disclosure Number: IPCOM000193569D
Published in the IP.com Journal: Volume 10 Issue 3B (2010-03-24)
Included in the Prior Art Database: 2010-Mar-24
Document File: 1 page(s) / 99K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

A hearing instrument includes a faceplate and a shell. Typically, the faceplate is a round and relatively flat plate, and, in case of an ITE (In The Ear) hearing aid, the shell is horn-shaped and molded to fit inside a user's ear. The shell is usually glued to the faceplate along the shell wall thickness to join the faceplate to the shell (refer to Figure 1). Current connections of the faceplate and the shell by means of cyanoacrylate based fast-acting adhesives have several disadvantages. First, such adhesives diffuse into the shell material which weakens the shell material at the connection. As a result, if there is a service case and the faceplate and the shell have to be divided, the shell can break. Second, cyanoacrylate based adhesives do not provide water and sweat resistance. Third, cyanoacrylate based adhesives cause gas emission which could damage the electronic parts and block the microphones.

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Soluble Glued Connection of Faceplate and Shell in Hearing Instruments

Idea: Erwin Singer, DE-Erlangen; Benjamin Schmidt, DE-Erlangen

A hearing instrument includes a faceplate and a shell. Typically, the faceplate is a round and relatively

flat plate, and, in case of an ITE (In The Ear) hearing aid, the shell is horn-shaped and molded to fit

inside a user's ear. The shell is usually glued to the faceplate along the shell wall thickness to join the

faceplate to the shell (refer to Figure 1).

Current connections of the faceplate and the shell by means of cyanoacrylate based fast-acting

adhesives have several disadvantages. First, such adhesives diffuse into the shell material which

weakens the shell material at the connection. As a result, if there is a service case and the faceplate

and the shell have to be divided, the shell can break. Second, cyanoacrylate based adhesives do not

provide water and sweat resistance. Third, cyanoacrylate based adhesives cause gas emission which

could damage the electronic parts and block the microphones.

At present, cyanoacrylate based adhesives are the only possibility to connect faceplates of dark color

with the shell, because UV curing is not possible with dark colored faceplates.

It is proposed to use a special soluble glue to connect the faceplate and the shell of hearing aids. The

glue is applied on the surface of the shell according to the current process. Optionally, a primer can be

applied before the glue.

The advantages o...