Axalto S.a.

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Commissariat a L'energie Atomique

Gemalto Sa

Schlumberger Malco, Inc.

Béatrice Bonvalot

Claude Fermon

Robert A Leydier

Myriam Pannetier

Sylvie Barbe

Laurent Le Moullec

Eric Servel

A protected electrical device having at least one electrical sub-assembly () to be protected comprises on at least one () of upper and lower surfaces (), at least a screening layer () against the electromagnetic (EM) and radiofrequency (RF) fields emitted by the electrical sub-assembly (). The screening layer () comprises at least a first layer made of soft magnetic material with a high relative permeability (&micro;r) larger than 500. The screening layer () is placed on substantially the whole surface of said at least one () of the upper and lower surfaces (), except on predetermined regions () of limited area, the electrical connections () with external devices being located on at least some of the predetermined regions of limited area.

Screened electrical device and a process for manufacturing the same

A chip for a chip-incorporating portable article having a card format, such as for smartcards. The chip includes a silicon substrate layer having integrated circuits in its active face defining a central processor unit and memories. The chip also includes physical means for providing physical protection against the action of electromagnetic radiation in the infrared range of wavelength longer than 1 &#x3bc;m.

Integrated circuit chip made secure against the action of electromagnetic radiation

For protecting a circuit () against a mechanical or electromagnetic attack, an active protection device attached to the circuit comprises: &#x2014;at least one generator () for generating a magnetic field, &#x2014;at least one magnetic sensor S, S, S, Sfor measuring a value of the magnetic field, &#x2014;an integrity circuit connected to the at least one magnetic sensor S, S, S, Sand to the circuit (). The integrity circuit activates a reaction procedure in the circuit if the measured value of the magnetic field made by the magnetic sensor is out of a values domain, the values domain being correlated to the generated magnetic field.

Active protection device for protecting circuit against mechanical and electromagnetic attack

A plurality of assemblies is manufactured. Each assembly comprises a sealing slice that is fixed to a base slice. The plurality of assemblies is manufactured in the following manner. In a preparation step, a stack is formed. The stack comprises a plurality of pre-assemblies. Each pre-assembly comprises a base slice, a sealing slice and a fixing layer provided between the base slice and the sealing slice. The stack further comprises at least one supple buffer layer. The supple buffer layer has a mechanical rigidity, which is substantially less than that of the base slices and that of the sealing slices. The supple buffer layer thus enables to compensate for variations in thickness of the base slices and of the sealing slices. In a fixing step, the stack is pressed which causes the sealing slice of each pre-assembly to be fixed to the base-slice of the pre-assembly.

Method of manufacturing a plurality of assemblies

Growing community of inventors

Meylan, France

Béatrice Bonvalot