| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a magnetoresisting card case which is not subjected to the external magnetic field of the latch of a hand bag by a method wherein a cobalt amorphous alloy plate of high permeability is enveloped by a plastic sheet in two doubleaspread sheets. SOLUTION: Two-fold doublespread sheets 11 and 12, with which a card is pinched, are the main composition of this magnetism-proof card case 1. External magnetic field can be shielded by these doors. Two sheets of high permeability cobalt amorphous sheets 13 of 0.6 mm in thickness are laminated and inserted in this card case 1. The whole external surface of the high permeability cobalt amorphous sheets 13 is enclosed by the plastic sheet 15 of vinyl chloride. The card case can be opened or closed along the center line 10 of the two doublespread doors, and a pocket 16, to be used to house a magnetic card, etc., is provided on the inner surface. As a result, this card case can be used safely as the housing case of a magnetic recording medium.</p> |
