Patent ID: 7745971

Claim:
A driving device comprising: a first actuator including a first piezoelectric element that is expanded and contracted in response to a driving signal and a first driving shaft that is attached to the first piezoelectric element and is reciprocated by the expansion and contraction operation of the first piezoelectric element, the first actuator moving a first driven member frictionally engaged with the first driving shaft; a second actuator including a second piezoelectric element that is expanded and contracted in response to a driving signal and a second driving shaft that is attached to the second piezoelectric element and is reciprocated by the expansion and contraction operation of the second piezoelectric element, the second actuator moving a second driven member frictionally engaged with the second driving shaft; and a driving signal control unit that supplies the driving signals to the first piezoelectric element and the second piezoelectric element such that each of the first actuator and the second actuator repeatedly changes its operational state between a driving state and a stop state, wherein the driving signal control unit supplies the driving signals such that the first actuator and the second actuator start to be driven or stop at different timings.