The present invention, in contrast to the above described conventional uses of piezoelectric elements, imparts {HEAD ~ motion} in {TAIL ~ a controlled manner} to prevent aliasing as will be described in greater detail below 
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The present invention , in contrast to the above described conventional uses of piezoelectric elements , imparts { HEAD ~ motion } in { TAIL ~ a controlled manner } to prevent aliasing as will be described in greater detail below
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH