| 摘要 |
PURPOSE:To prevent a failure in side erasing with respect to all radiuses by providing a recording and reproducing head chip in tae fixed end and providing a side erasing head chip in a moving piece end. CONSTITUTION:The recording and reproducing head chip is provided in the fixed end of a head base 20 whose one end is the fixed end and the other is the moving end, and the side erasing head chip is provided in the moving end. They are finished to the same spherical surface initially, and the side erasing head chip is displaced to a desired position thereafter. Thus, side erasing of recording and reproducing tracks is performed surely to prevent a failure in erasing even if tracks on a disc-shaped recording medium are different in radius, and a wider track width is attained for the same track density and S/N of signals is improved. |
