In the first embodiment, {HEAD ~ the size} of {TAIL ~ the laser unit} is more compact, compared to the prior art apparatus, even when a portion without the collimator lens 7 is compared 
of
In the first embodiment , { HEAD ~ the size } of { TAIL ~ the laser unit } is more compact , compared to the prior art apparatus , even when a portion without the collimator lens 7 is compared
OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH