| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a writing recording system which reduces erroneous read of a signal to accurately detect coordinates. SOLUTION: A surface 102 of a medium 100 to be written is formed with an ultraviolet-ray absorbent, and a lattice pattern 101 is printed on the surface 102 of the medium 100 with an invisible ultraviolet fluorescent ink. The surface 102 of the medium 100 is detected as a dark color in an ultraviolet area, because of the action of the ultraviolet-ray absorbent to reduce the noise caused by reflection from the surface 102 of the medium 100 regardless of irradiation of sufficiently intensive light; and therefore, misreading of a signal is reduced to accurately detect coordinates because the difference in fluorescent intensity between the surface 102 of the medium 100 and the lattice pattern 101 is made larger in comparison to the case where the surface 102 of the medium 100 is formed, without the ultraviolet-ray absorbent.</p> |
