| 摘要 |
PROBLEM TO BE SOLVED: To enhance the reliability by providing input terminals, a semiconductor switching element, a rectifier element, a current detection resistor and an integration circuit thereby controlling a DC motor accurately at all times. SOLUTION: When a positive voltage is inputted to input terminals 45, 46, a field effect transistor 22 is turned on upon provision of an input voltage to the gate of field effect transistor 22. Consequently, a current flows through a diode 25, a current detection resistor 40, a DC motor 49, a current detection resistor 44, and the field effect transistor 22 to rotate a DC motor 49 forward thus resetting a door mirror. The current flowing through the DC motor 49 is detected by the current detection resistor 44 and converted into a voltage which is then integrated by an integration circuit comprising a capacitor 30 and a resistor 43 and applied to the gate of a field effect transistor 24. When the integrated voltage of integration circuit, i.e., the voltage of capacitor 29, reaches a predetermined level, the DC motor 49 is stopped. |
