| 摘要 |
<p>PURPOSE:To uniformize the thickness of the air film of a tape, which travels on the traveling surfaces of a rotating drum and a fixed drum, extending over a whole circumference from the entrance part to the exit part of a tape winding position in a tape recorder or the like provided with the rotating drum and the fixed drum. CONSTITUTION:A spiral-like groove 4 is formed on either of the faced surfaces of the rotating drum 2 and the fixed drum 1. Then, the width of a groove 7 formed in the circumferential direction of the drum 2 is made wide. Besides, a plane surface 11 whose width is changed is formed on the outside circumferential part of the faced surface to the surface where the spiral-like groove 4 is formed.</p> |
