Electromagnetic shielding and wave absorption sheet and the production of the same
First Claim
1. A shielding sheet made by embedding soft magnetic metal or alloy powder within a pliable insulating layer whereby said pliable insulating layer contains powder embedded therein;
- said powder being distributed within said pliable insulating layer to thereby form at least one powder layer component containing a first concentration of metal or alloy powder distributed therein, and a remaining portion of said pliable insulating layer which contains a second concentration of metal or alloy powder distributed therein;
with the proviso that the second concentration of metal or alloy powder is either zero or is present at a lesser concentration than said first concentration; and
with the proviso that said at least one powder layer component extends either;
1) along at least one surface of the insulating layer; and
/or2) within said insulating layer;
said metal or alloy powder being in the form of particles having an average diameter of less than or equal to 100 μ
m.
1 Assignment
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Accused Products
Abstract
An object of the present invention is to provide a shielding sheet which has a high and stable shieldability to electromagnetic waves, has a sufficient pliability, and can be easily wound around a cable and the like. The shielding sheets 1, 1'"'"', and 1" each having a pliable insulating layer 2, a powder layer 3 in which a powder 4 made of soft magnetic metal or alloy, having an average particle diameter of less than 100 μm, is buried in layers along at least one surface of the insulating layer 2 and/or at the midpoint position along the thickness direction. It also includes a shielding sheet 1a in which a powder 4 is distributed in the middle portion 5 of the insulating layer 2 at the ratio of less than 70% by volume to the powder layer 3, 3 along both surfaces. Furthermore, shielding sheets 1, 1a, 1'"'"', and 1", in which a powder 4 of the powder layer is flat shaped, the aspect ratio being more than 2, and the powder is buried in a manner that the longer diameter direction of the powder is almost along the plane surface direction of the insulating layer 2, are also included within the scope of the present invention.
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Citations
10 Claims
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1. A shielding sheet made by embedding soft magnetic metal or alloy powder within a pliable insulating layer whereby said pliable insulating layer contains powder embedded therein;
- said powder being distributed within said pliable insulating layer to thereby form at least one powder layer component containing a first concentration of metal or alloy powder distributed therein, and a remaining portion of said pliable insulating layer which contains a second concentration of metal or alloy powder distributed therein;
with the proviso that the second concentration of metal or alloy powder is either zero or is present at a lesser concentration than said first concentration; and
with the proviso that said at least one powder layer component extends either;1) along at least one surface of the insulating layer; and
/or2) within said insulating layer; said metal or alloy powder being in the form of particles having an average diameter of less than or equal to 100 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- said powder being distributed within said pliable insulating layer to thereby form at least one powder layer component containing a first concentration of metal or alloy powder distributed therein, and a remaining portion of said pliable insulating layer which contains a second concentration of metal or alloy powder distributed therein;
Specification