| http://www.w3.org/ns/prov#value | - However, there is a problem in the conventional structure and fixing method thereof in that a process of accurately adjusting distance and optical axis is very difficult when the focusing lens 5 and the laser diode 1 are arranged, and on top of that, even though the arrangement is established, the same is deviated no less than scores of ??m from the optical axis according to quantity of epoxy and
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