Hook-shaped part of a behind-the-ear hearing aid
US4296829A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1979 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Dec 14, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2225/0213
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hook shaped part (2) for a behind the ear hearing aid. The hook shaped part is hollow and at one end (5) formed to be connected to an acoustic output from the upper front end of the hearing aid case (1) and serving to transmit sound from the hearing aid in the direction of the ear, normally through a tube (3) and an ear plug (4), and also serving to support the hearing aid upon the outer ear. In the hook shaped part there is, at the end (8) furthest from the hearing aid included an acoustic filter (9). The hook shaped part (2) has, in the direction away from the hearing aid a channel (6) of increasing cross sectional area. Through the form of the channel (6) is obtained a suppression of resonant phenomena in the tube (3) and the frequency response is made independent of the length of this tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.