Patent · US Expired

Miniature hearing aid

US4672672A · kind A · utility

99Cited by

4References

14Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Albert Eggert · Berlin, DE
Jurgen Montag · Berlin, DE
Manfred Muller · Berlin, DE
Peter Wiener · Berlin, DE

Key dates

Filing date	Feb 18, 1986
Grant date	Jun 9, 1987
Priority date	—
Expiry date	Feb 18, 2006

Classification

Technology area (CPC H)Electricity
CPC primaryH04R2225/61
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The housing is essentially spherically shaped, formed with a flattened end wall (14), through which a sound receiving opening (42) extends in axial direction, located eccentrically with respect to the spherical housing. A volume control button (50) covers the sound receiving opening, the volume control button being maintained by a small distance (h) spaced from the spherical end wall to permit entry of sound to the sound receiving opening, while preventing masking of the sound receiving opening by the finger of a user, and free entry of contamination thereto. Preferably, the button is connected to the volume control element by an inwardly extending collar (52) which snaps over an adjustment rim (35) on a volume control positioned axially centrally on a printed circuit board (31) secured within the housing and passing through a central opening (47) formed therein. The flat end wall (14) can be formed with additional openings to permit access to adjustment screwdriver heads (36) of trimmer resistors, the additional openings likewise being masked by the volume control button for protection and to prevent contamination.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.