| 摘要 |
PROBLEM TO BE SOLVED: To make the specification of display area sure and easy, and to improve accuracy in the recording and reproducing of data against the stretching and contracting deformation of a digital data recording paper. SOLUTION: Concerning the digital data recording paper on which 2N[N=2<n> (n>=4)] pieces of information are recorded in a rectangular display area 5 so as to be optically readable, an additional mark 3 is provided for optically reading an X-axis base line 3A and an Y-axis base line 3B continued to one end of X-axis base line 3A. Concerning the additional mark 3, an extension element 3C protruded toward Y-axis direction and display area side is formed at the other terminal part of X-axis base line 3A and an extension element 3D protruded toward X-axis direction and display area side is formed at the other terminal part of Y-axis base line 3B. Then, the additional mark 3 is L-shaped from the X-axis and Y-axis base lines 3A and 3B mutually linked at one end while having the extension parts protruded into the display area at both the terminal parts. A unit data area 2 is made into square and the display area is made square. |
