Patent ID: 7977909

Claim:
A stepping motor driving apparatus of an analog electronic clock, comprising, a stepping motor having a rotor, a stator, and a coil; a pulse supply section that supplies one pulse of a plurality of pulses having different effective values to the coil in synchronization with a predetermined cycle; a rotation detection section that detects whether or not the rotor is rotated by an induced current generated in the coil, after the pulse supply section supplies the one pulse to the coil; a first switching control section that switches the one pulse supplied from the pulse supply section to the coil to another pulse having a larger effective value, when the rotation detection section does not detect rotation of the rotor after the pulse supply section supplies the one pulse to the coil; and a second switching control section that switches the another pulse supplied from the pulse supply section to the coil to a further pulse having a smaller effective value, when the rotation detection section detects rotation of the rotor continuously for a predetermined period or a predetermined number of times; wherein the apparatus further comprises a third switching control section that switches a driving pulse to a pulse having a smaller effective value when the rotation detection section detects that the rotor is not rotated for two times continuously even after the first switching control section increases an effective value of the driving pulse for two times continuously.