A second embodiment of the present invention is provided for overcoming {HEAD ~ the above problems} of {TAIL ~ the first embodiment} and includes structural components for providing a feature of Spot Wobble Defocus 
of
A second embodiment of the present invention is provided for overcoming { HEAD ~ the above problems } of { TAIL ~ the first embodiment } and includes structural components for providing a feature of Spot Wobble Defocus
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH