In an optical signal readout apparatus including a source of laser light, {HEAD ~ a rotary disc record}, a photo detector, and an optical scanner for focusing light from the source onto the record and directing {TAIL ~ light} reflected back from the record onto the photo detector, the improvements characterized by: 
for directing
In an optical signal readout apparatus including a source of laser light , { HEAD ~ a rotary disc record } , a photo detector , and an optical scanner for focusing light from the source onto the record and directing { TAIL ~ light } reflected back from the record onto the photo detector , the improvements characterized by :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH