Patent ID: 7129661

Claim:
A motor driver comprising: (a) an energizing unit for supplying a current to a driving coil of a motor; (b) an energizing signal generator for generating a normal generating pattern which the energizing unit performs to the driving coil; (c) a first energizing signal output unit in which a first non-normal energizing pattern is stored; (d) a second energizing signal output unit in which a second non-normal energizing pattern different from the first pattern is stored; (e) a rotary direction detector for detecting a rotary direction of the motor; (f) an over current detector for detecting a current of the motor; (g) a first signal selector for selecting a signal to be supplied to the energizing unit; and (h) a second signal selector for selecting a signal to be supplied to the first signal selector, wherein the first signal selector receives a signal from the energizing signal generator, a signal from the second signal selector, and a signal from the over-current detector, then selects either one of the signal from the energizing signal generator or the signal from the second signal selector based on the signal from the over-current detector before outputting the signal selected, wherein the second signal selector receives a signal from the first energizing signal output unit, a signal from the second energizing signal output unit, and a signal from the rotary direction detector, then selects either one of the signal from the first energizing signal output unit or the signal from the second energizing signal output unit based on the signal from the rotary direction detector before outputting the signal selected.