| 摘要 |
<p>In an apparatus for magnetically recording and/or reproducing signals, such as video signals, on a magnetic tape extending between and wound on supply and take-up reels, and in which the tape between the reels is selectively guided in a first path removed from a tape guide drum and in a second path that extends about at least a portion of the guide drum periphery for scanning of the tape by a rotary magnetic head associated with the guide drum; the driving of the tape in each of the first and second paths is controlled by a sensing device which includes a light source and a light detector defining a light path therebetween which is intercepted by each of the first and second tape paths so that the light detector receives or detects light from the source to halt the driving of the tape only when a transparent leader provided at least at one end of the magnetic tape intercepts the light path.</p> |
