Patent ID: 7280292

Claim:
A driving control device comprising: an electro-mechanical converting element that expands and contracts along a predetermined direction; a driving member fixed to an end of the electro-mechanical converting element in the predetermined direction; and a driving pulse control section that controls supply of driving pulses to the electro-mechanical converting element, wherein: the driving pulse control section controls the supply of driving pulses to cause the electro-mechanical converting element to expand and contract so that an expansion rate of the electro-mechanical converting element along the predetermined direction is different from a contraction rate of the electro-mechanical converting element along the predetermined direction, to thereby vibrate the driving member along the predetermined direction and move a driven member, which frictionally engages with the driving member, in two directions including one direction along the predetermined direction and an opposite direction to the one direction, and the driving pulse control section comprises: an actual driving pulse number measuring unit that measures actual driving pulse numbers, which are respectively required to actually move the driven member by a predetermined movement amount in the two directions, before a positioning operation for positioning the driven member is started; a correction factor calculating unit that calculates correction factors for correcting a relationship between a driving pulse number and a traveling distance of the driven member with respect to the respective two directions, based on the actual driving pulse numbers obtained by the measurement and a predetermined reference pulse number; and a driving pulse number correcting unit that corrects an element driving pulse number, which is supplied to the electro-mechanical converting element so as to move the driven member, based on the calculated correction factors for the respective two directions.