| 摘要 |
A prepaid card is disclosed, which uses drawing codes not requiring so high accuracy and permits direct computer processing of read-out data without agency of any A/D converter, thus permitting system security improvement. In the prepaid card 1, main information 2, personal information 3, fingerprint image 4 and security data rotation key 5 are printed on the surface as a transparent print pattern with box drawing codes provided in the form of four tetrahedrons of different sizes arranged one inside another, the four sides of each tetrahedron being constituted by respective segments representing respective bit expressions, the individual bit expressions of the segments being for a predetermined digit place arrangement from the least significant digit place to provide a binary number system expression representing a corresponding decimal or n-step number system expression, a predetermined numeral, character, symbol, etc. being represented by the bit expression of a segment or a summation of some of the bit expressions.
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