| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery indicator capable of exactly indicating a residual amount in a battery with a simple structure. SOLUTION: The device comprises a transistor 102 that conducts an on-off changeover of a supply of an operating voltage from a battery power source 101 to a load 104, a control circuit 105 that controls the switching of the transistor 102 so as to keep the operating voltage of the load 104 at a predetermined level at the time interval that corresponds to a difference between the operating voltage of the load 104 and the standard-voltage generating circuit 106, a luminous diode 107 and a photo-transistor 108 that detect an on-signal or an off- signal of the transistor 102 among the control signals output from the control circuit 105, an integrating circuit 109 that integrates an on-time of the transistor 102 with the obtained detecting signal, and a luminous diode 110 that lights when the integrated value exceeds the predetermined level. |
