An optical scanner A for {TAIL ~ a video recording disc} B includes {HEAD ~ a photo detector} 6 for sensing the light from a laser source 1 reflected back from the disc 
An optical scanner A for { TAIL ~ a video recording disc } B includes { HEAD ~ a photo detector } 6 for sensing the light from a laser source 1 reflected back from the disc
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH