Objective lens driving system in a optical pick up and {HEAD ~ method} of modulating {TAIL ~ the resonance frequency} of its lens holder 
of modulating
Objective lens driving system in a optical pick up and { HEAD ~ method } of modulating { TAIL ~ the resonance frequency } of its lens holder
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH