| 摘要 |
PURPOSE:To avoid a damage of a magnetic tape according to a notch section and to enhance an image quality of a reproduced image by making small a width of the notch section gradually as the width of the notch section along a rotating direction of a rotating cylinder is separated from the magnetic head. CONSTITUTION:End sections 1a, 11b are together tapered with respect to an end section 2a opposing to a fixed cylinder 3 of a rotating cylinder 2. Accordingly, a surface shape of a notch 11 is wise in width in the vicinity of a magnetic head 10 and narrower in width in a direction shown in an arrow C as separating from the magnetic head 10 to form a trapezoid. Such surface-shaped notch 11 has a small area and an attracting amount of a magnetic tape is small. Since an angle formed by the end sections 11a, 11b of the notch section 11 and an upper section 11c thereof becomes mild, a flow of an air in the notch 11 is relatively smooth, a turbulence of the flow is decreased and a vibration of the magnetic tape is reduced. Thereby, the damage of the magnetic tape by the notch is prevented and the quality of the image of a reproduced image.
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