| 摘要 |
An electrostatic notice board system in which characters can be written on the surface while attraction force sufficient to hold objects thereon being maintained. In the system, a hard coating material layer is formed at the surface off the attraction layer consisting of a layered dielectric substance and the back face of the attraction layer is provided with a pair of positive and negative electrodes in the form of comb-teeth, so that the objects such as paper sheets are attracted and held by coulomb force on the surface of the hard coating material layer. The hard coating material layer is, for example, formed by applying acrylic urethane coating material to the surface of the attraction layer and hardening the material with ultraviolet ray irradiation. The hard coating material layer has a volume resistivity of 1010 OMEGA cm or more and thickness of 50 mu or less.
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