Patent · US Expired

Process for a diaphragm for electroacoustic transducers

US6655001B1 · kind B1 · utility

0Cited by

7References

7Claims

0Family size

Assignee

ROEHM GMBH & CO. KG · DE

Inventors

Dirk Roosen · Gerolzhofen, DE
Leonhard Maier · Babensham, DE
Hermann Seibert · Kaiserslautern, DE

Key dates

Filing date	Feb 12, 2002
Grant date	Dec 2, 2003
Priority date	—
Expiry date	Feb 12, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49126
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A diaphragm for an electroacoustic transducer has a) a core layer containing poly(meth)acrylimide foam and b) at least one cover layer. The diaphragm is produced by laminating the cover layer with the core layer, using a pressure of 0.4 MPa and a temperature of 160° C., whereby at least the side of the core layer which comes into contact with the cover layer is compressed. The resultant composite is subsequently cooled to a temperature below 80° C., before the pressure is reduced to the ambient pressure. The process can be carried out as a single-step process. The diaphragms produced by this process demonstrate an excellent stability, whereby the cover layers in particular are highly resistant to separation.

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