Patent ID: 7102270

Claim:
A driving device comprising: a first drive shaft; a second drive shaft; a first piezoelectric element which is disposed in contact with one end of said first drive shaft; a second piezoelectric element which is disposed in contact with the other end of said first drive shaft and one end of said second drive shaft; a third piezoelectric element which is disposed in contact with the other end of said second drive shaft; a first driven member which is frictionally engaged with said first drive shaft in a slidable manner; a second driven member which is frictionally engaged with said second drive shaft in a slidable manner; and a drive signal generating circuit, which outputs a drive signal for respectively expanding and contracting said first, second and third piezoelectric elements in an axial direction of said first and second drive shafts, said first and second drive shafts being displaced in said axial direction by said expansion or contraction of said piezoelectric elements so as to move said first and second driven members in said axial direction.