Patent ID: 7923898
Filing Date: 2011-04-12
Classification: G02B,H01L,H02N

Abstract:
1. A piezo drive system comprising: a piezo drive element having a first face and a second face opposite to the first face; a rod having one end secured to the first face of the piezo drive element, the rod having a shaft portion extending upwardly, the shaft portion having an outer surface having a vamplate portion, the shaft portion having a front portion located closer to a front end of the rod than is the vamplate portion; a rotor into which the front portion of the shaft portion can be inserted, the rotor making a surface contact with the vamplate portion, the rotor being capable of rotating relative to the rod; and a preloading unit for pushing the rotor against the vamplate portion of the rod; wherein the piezo drive element causes the rod to produce a torque, thus rotationally driving the rotor.