| 摘要 |
PURPOSE:To decrease a charged amount of a tape sliding face, to smoothen tape travelling and to prevent noise from generation by adding carbon fiber, that is, an antistatic agent to a molding material obtained by forming a case main body constituting an erase head and a tape sliding face of the head in one body, and limiting an area resistant value of said molding material to the specified range. CONSTITUTION:Plastic (for instance, nylon, polyphenylene sulfide, polybutylene terephthalate, etc.), minorganic filler (for instance, alumina, calcium carbonate, quartz glass, etc.) and an antistatic agent of carbon fiber, are appropriately added to a basic constitution material of a case main body 10 which is formed with a tape sliding face in one body. Accordingly static electricity due to friction is prevented. It is assumed that in the basic constitution material, percentages in weight of plastic, an inorganic filler and carbon fiber are 35:65:4, for practical intance, and an area resistant value is 10<10>-10<13>[OMEGA/cm<2>]. |
