Self Adjusting End Of Tape/Beginning Of Tape Optical Transducer Detection Circuit
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Fig. 1 shows a technique for securing beginning of tape (BOT) and end of tape (EOT) signals. The half inch wide magnetic tape passes below an assembly containing two light sources L1 and L2 and two photosensors PH1 and PH2. Reflective aluminum strips of foil (tape marks) are pasted to the magnetic tape MYLART* surface. One tape mark sticker is on one end (and one side) of the magnetic tape and serves as the EOT, while the other sticker is on the opposite end (and side) and serves as the BOT.