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