| http://www.w3.org/ns/prov#value | - Although FIG. 5 is a timing chart where the cycle (F1) and the cycle (F2) are set to be the non-reading-out periods and the cycle (F3) is set to be the reading-out period, of course, it is also possible to radiate light rays by LED, which is the second light source, during the non-reading-out period in the cycle (F1) and to set the cycle (F2) to be the reading-out period.
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