| 摘要 |
<p>A second bar code such as an add-on code which comprises only a character bar and is added to the side of the first bar code such as UPC, EAN and JAN and having a center bar and a guard bar can be correctly read out. When the scanning is made from the first bar code side to the second bar code side, a write address produces, when the right guard bar of the first bar code is recognized, a signal which is used to access the data of the second bar code. Conversely, where the scanning is made from the second bar code side to the first bar code side, the write address produces, when the center bar of the first bar code is recognized, a signal which is used to access the second bar code after subjecting to some arithmethic operation. Therefore, the first bar code can be clearly distinguished from the second bar code which is different in the bar code system and the second bar code can be correctly read out.</p> |
