| 摘要 |
PROBLEM TO BE SOLVED: To enable a person of advantage age read easily letters of a book as the size of the book and an information content are left as they are and even in a time zone wherein a beam amount on and after evening is decreased and at a place of letter light amount being little. SOLUTION: Fluorescence ink, luminous ink, etc., ink emitting light by chemical reaction or the like, ink emitting light by storing the light of light storing ink or ink of high reflection rate of light is used for printing letters in all or principal part letters of the book. Otherwise, paper itself printed with the letters is made fluorescent, luminous paper and storing light paper. COPYRIGHT: (C)2008,JPO&INPIT
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