| 摘要 |
PROBLEM TO BE SOLVED: To improve aging stability in contrast by using a specified micro-capsule with which a magnetic body is encapsulated. SOLUTION: The magnetic body 3 capable of revising an oriented direction according to a magnetic field from a magnetic pen 2 of a permanent magnet stick is excapsuled with the micro-capsule 5 whose diameter L is 30-50μm together with a viscous liquid 4. A micro-cupsule layer 10 is supported by a substrate 6, and is provided with a magnetic body sheet 11 guiding magnetic flux from one end of the magnetic pen 2 to its another end on the rear surface of the substrate 6. When one end of the magnetic pen 2 is made nearer to a display plate for a magnetic visible display plate 1 at a write-in time, since the magnetic flux M generated from the one end advances along a minimum distance with the magnetic body sheet 11, it arrives directly at the magnetic body sheet 11. The direction of the magnetic flux M becomes vertical to the substrate 6, and the magnetic body 3 becomes vertical to the substrate 6 consisting a non-magnetic black body layer also. Thus, since the black body layer of the substrate 6 reflects incident light, a write-in part is displayed in black.
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