| 摘要 |
<p>PURPOSE:To decrease the running control trouble of a tape and to stabilize running by changing an angle so that the lead groove for tape running of the cylinder can not be abutted from the border of a video track part and a PCM track part to the tape. CONSTITUTION:The angle of a lead groove 1 is changed downward so as to be separated from a tape 2 with a point B shown in the figure as the border. Thus, the video track part is touched to the lead groove 1 only at 180 deg. and regulated. In this case, since the product has no PCM, a length L2 for the PCM track part is not recorded/reproduced. Therefore, the touch of a track caused by the touch of the lower edge of the tape 2 to the lead groove 1 in the length L2 (between points A and B) does not become any problem.</p> |
