| 摘要 |
PROBLEM TO BE SOLVED: To inspect the charge of a battery during the operation of an electronic apparatus by incorporating an indicator in the electronic apparatus using the battery as a power source and instantaneously activating the same by a switch. SOLUTION: The positive and negative terminals 14, 16 provided in an electronic apparatus are connected to a battery and a charge measuring circuit 18 is connected between the terminals 14, 16. In the circuit 18, voltage dividers 20,34 are connected between the Zener diode 30 of reference voltage and a terminal 14 and the nonreversal input of a comparator 42 and the reversal input of a comparator 44 are connected to a voltage dividing node 34 and the reversal input of a comparator 50 is connected to the outputs of the comparators 42, 44 through diodes 46, 52 and the non-reversal input thereof is connected to the voltage dividing node 20. The light emitting diodes 48, 54, 58 connected to the respective comparators emit the visible lights corresponding to the charge quantity of the battery to show a charge and discharge state. At this time, activity and non-activity are selected by the switch 40 provided between the circuit 18 and the terminal 16 to inspect the charge of the battery during the operation of the apparatus.
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