Ferroelectret double and multilayer composite and method for...

B - Operations – Transporting – 32 – B

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B32B 3/20 (2006.01) B06B 1/02 (2006.01) B06B 1/06 (2006.01) B32B 27/08 (2006.01) H01L 41/08 (2006.01) H01L 41/083 (2006.01) H04R 17/00 (2006.01) H04R 17/02 (2006.01) H04R 23/00 (2006.01)

Patent

CA 2746482

The invention relates to a method for producing double or multilayer ferroelectret with defined cavities by: structuring at least one first surface of a first polymer film (1) forming a height profile, applying at least one second polymer film (5, 1') to the structured surface on the first polymer film formed in step a), joining the polymer films (1, 1', 5) to give a polymer film composite with the formation of cavities (4, 4') and electrically charging of the inner surfaces of the cavities (4, 4') formed in step c) with opposing electrical charges. The invention further relates to ferroelectret multilayer composites, optionally produced by said method, comprising at least two polymer films, arranged one over the other and connected to each other, wherein cavities are formed between the polymer films. A piezoelectric element comprising a said ferroelectret multilayer composite is also disclosed.

Procédé de fabrication de ferroélectrets à deux couches ou multicouches pourvus de cavités définies, qui consiste (a) à structurer au moins une première surface d'un premier film polymère (1), ce qui permet d'obtenir un relief, (b) à déposer au moins un deuxième film polymère (5, 1') sur la surface structurée, formée à l'étape (a), du premier film polymère, (c) à relier les films polymères (1, 1', 5) pour obtenir un composite de films polymères, avec formation concomitante de cavités (4, 4') et (d) à charger électriquement les surfaces internes des cavités (4, 4') formées à l'étape (c) avec des charges électriques opposées. La présente invention concerne en outre des composites multicouches à ferroélectret, éventuellement fabriqués selon le procédé décrit, comprenant au moins deux films polymères disposés l'un sur l'autre et reliés l'un à l'autre, des cavités étant formées entre lesdits films polymères. Elle concerne encore un élément piézoélectrique contenant un composite multicouche à ferroélectret selon l'invention.

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