A video tape cassette of the type wherein a supply reel and a take-up reel are contained therein holds a magnetic video tape having transparent sections of tape at each end connected to a respectively one of the reels. A light-receiving element, or sensor, such as a phototransistor is incorporated into...http://www.google.fr/patents/US4343024?utm_source=gb-gplus-shareBrevet US4343024 - Device for detecting tape end of magnetic recording apparatus
Device for detecting tape end of magnetic recording apparatus
