| 摘要 |
PURPOSE:To eliminate the danger of an electrostatic change and to prevent the deformation due to the abutment of a rotary driving shaft by sticking the sheet for preventing wear made by an antistatic processing so that a plastic sheet may attain to <=10<13>OMEGA at its surface resistance rate to the case inner peripheral face position where the tip of the rotary driving shaft inserted into a case abuts. CONSTITUTION:The sheet 40 for preventing wear in circular shape is stuck at the position of the center on the inner peripheral face of an upper side case half body 21, namely the position where the rotary driving shaft for rotating a magnetic disk is abuttable. For this sheet 40 for wear prevention, the plastic sheet subjected to an antistatic processing having low friction property and excellent wear resistance so that its surface electric specific resistance may become <=10<13>OMEGA, preferably <=10<8>OMEGA, e.g., polytetrafluoroethylene resin (PTFE), polypropylene, polyethylene, etc., are used and an extra high polymer polyethylene is optimum specially. The sheet 40 for wear prevention is hardly deformed, having no danger of its electrostatic charge as well.
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