| 摘要 |
<p>PROBLEM TO BE SOLVED: To properly control a light-emitting current of a light-emitting sensor. SOLUTION: A light-emitting current of a light-emitting sensor 34a is increased (Figure 4, S11). A light radiated from the light-emitting sensor 34a penetrates a card, and whether the light can be received by a light-receiving sensor 34b is determined (S12). When the light radiated from the light-emitting sensor 34a has transmitted the card (S12, 'YES'), a value wherein a prescribed value is subtracted from a light-emitting current value at the transmission is obtained, and the obtained value is set as a light-emitting current value of a light-emitting sensor of a post-stage (S15).</p> |
