| 摘要 |
A portable credit or identity card or the like incorporates magnetic bubble elements. The bubble elements comprise a layer of magnetic material capable of containing magnetic bubbles and which is provided with a propagation track and a means for detecting the bubbles. Two flat permanent magnets arranged on either side of the magnetic layer generate a magnetic polarizing field perpendicular to the layer. The bubble element forms the memory which contains the identity code for the card. |
