Magnetic shielding members
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United States of America Patent
Stats
-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Jul 19, 1984
filing date -
Jul 22, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic shielding device, adapted to protect a magnetic recording member against external magnetic fields, includes a plurality of spaced apart sheets of ferromagnetic material and the total thickness of the spacings between adjacent sheets of ferromagnetic material is selected to be larger than 0.5 mm. In a modification, the spaced sheets are covered with covers and the peripheral portions thereof are welded together. In another modification a sheet of insulating material having a surface area larger than those of the sheets of ferromagnetic material is interposed therebetween.
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