| 摘要 |
PURPOSE: To make the contents of display so as to be easily alterable at a site of construction. CONSTITUTION: A transmitting plate 1 is installed at the front side and a back plate 2 consisting of a magnetic substance is installed at the backside. A lot of display elements 3 consisting of a magnet each are installed in space between the transmitting plate 1 and the back plate 2 with both sides reversibly, and a surface 31 and a backside 32 of the display element 3 consist in heteropolarity, and differently colored from each other. A message can be easily displayed in time of only tracing on the transmitting plate 1 with another magnet, and likewise the message is easily alterable. Moreover, since the back plate 32 installed in the backside of the display element 3 consists of a magnetic substance, it is attracted together with the display element 3 consisting of the back plate 3 and the magnet by magnetic force with each other, therefore other than such a time of being turned over, the display element 3 will not arbitrarily be rocked at all, and thus the displaying state is stably kept up. |
