| 摘要 |
<p>PURPOSE:To recognize the lack of residual capacity in a battery and further to improve reliability. CONSTITUTION:In a coordinate indicator for a coordinate detector internally equipped with a pen coil 2 for impressing an alternating magnetic field to a coordinate input tablet, AC exciting current generating part 3 to supply an AC exciting current to this pen coil 2 and battery 4 as the power source of this AC exciting current generating part 3, a voltage monitoring part 5 is provided to monitor the voltage of the battery 4, and an alarm part 6 is provided to alarm that the voltage of the battery 4 is lower than a prescribed value when it is detected by this voltage monitor part 5.</p> |
