| http://www.w3.org/ns/prov#value | - In FIG. 12, the light source unit 1 comprises a plurality of fiber-couplers 1-- 12 arranged at regular or irregular intervals in a vertical direction with respect to the sheet of FIG. 12, and a plurality of optical fibers 1-- 1, each being equipped with a light emitting element such as an SLD (Super Luminescent Diode), an LED (Light Emitting Diode) or the like at their one end but not illustrated.
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