VACUUM METALLIZATION PROCESS ON A METALLIC, PLASTIC-COATED OR FILM-COATED SUBSTRATE BY MEANS OF AN INSULATING AGENT, AND DEFINITION OF THE SUBSTRATE ITSELF WHICH FORMS SHIELDING AGAINST ELECTROMAGNETIC FIELDS

Abstract

The invention relates to obtaining one or more layers of a chosen metallic alloy deposit from several metals in a vacuum evaporation installation on a substrate made of a plasticized metal sheet or covered with a layer of electrically insulating material of a chosen thickness, the vacuum metallization being carried out on the insulating side of the substrate in order to create shielding against a broad spectrum of parasitic electromagnetic fields.

Description

The invention relates to obtaining one or more layers of a metallic alloy deposit from several metals in a vacuum evaporation installation on a substrate made of a plasticized, film-coated, or electrically insulating metal sheet of a chosen thickness, by any known means, according to the descriptions and claims established in patent application No. 8809898 and the addition deposits. N 8811556 and 8902686, vacuum metallization is carried out on the insulating side of the substrate. One aim of the invention is, among other things, to be able to select shielding against defined parasitic electromagnetic fields (E^H), originating from various sources. Indeed, vacuum metallization by the simultaneous evaporation of several metals forms alloys with high magnetic permeabilities defined according to the choice and proportions of the metals used, most often containing iron and nickel, as well as other additive metals. These permeabilities are defined according to the attenuation required by titanium alloys, which provide shielding against electromagnetic fields (E^H) at very low, low, and mid frequencies of the electromagnetic spectrum. Above 100 kHz, it often becomes necessary to use sheets of various metals, such as copper or aluminum, to shield against electromagnetic fields at mid and relatively high frequencies; these metals are not effective at low frequencies. By coating a metal film or flexible metal sheet with a flexible or rigid electrically insulating material using any known method, in order to obtain a homogeneous sheet forming a thin composite layer, the metals required to form the desired alloy can be evaporated under vacuum, depositing a shielding layer on the insulating side. This creates two distinct shields, separated by the insulator, each providing the required shielding for a different part of the electromagnetic spectrum, with an overlap over a chosen, and possibly restricted, frequency range. This flexible or rigid material, depending on the recommended insulating material, can thus create effective shielding against parasitic electromagnetic fields (E^H) over a wide frequency band.

Claims

DEMANDS 1) Evaporation by Joule effect in a vacuum chamber of several metals forming an alloy or of several layers of several metals forming an alloy according to the set of claims of the main patent and claims of each of the preceding additions to the main patent, character sterilized by the fact that the substrate on which the vacuum storage is a metallic foil, serving as shielding against electromagnetic fields, covered of a layer of electrically insulating material. 2) Vacuum evaporation of several metals in proportions various ways to form an alloy according to claim 1 ca characterized by the fact that this high-grade u-type alloy magnetic permeability is deposited on the insulating side of the metal sheet / insulating material assembly. 3) Vacuum evaporation according to claims 1 and 2 characterized by the fact that the substrate after deposition forms a sheet with three distinct layers, the part metallic on the one hand forms a shield against the fields electromagnetic fields at medium and relatively high frequencies quences and whose vacuum deposition of the Li type forms a blind protection against medium and low electromagnetic fields its frequencies, thus covering a wide band of the spectrum, the two shields being separated by the insulating material. 4) Substrate according to claims 1 to 3 characterized by the The fact that the entire assembly of metal sheet, insulating material and Vacuum deposition forms a thin composite sheet that can The choice is yours: flexible or rigid.