Process for a diaphragm for electroacoustic transducers
AssigneeRoehm GmbH
InventorsDirk Roosen, Leonhard Maier, Hermann Seibert
Life of this patent
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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.
Claims7
A process for producing a diaphragm for electroacoustic transducers, wherein said diaphragm comprises a core layer and at least one covering layer, and said core layer comprises poly(meth)acrylimide foam,
- said process comprising:
- laminating said covering layer with said core layer comprising the poly(meth)acrylimide foam at a pressure greater than 0.4 MPa and a temperature greater than 160° C.,
- while compacting at least one side of said core layer comprising the poly(meth)acrylimide foam in contact with said covering layer to form a resulting composite,
- then cooling said resulting composite to a temperature below 80° C.,
- then reducing the pressure to ambient pressure.
Dependencies are inferred from the claim text.