Patent ID: 8161844
Filing Date: 2012-04-24
Classification: C22C,F16H,G02B,Y10T

Abstract:
1. A camera using a piezo motor for sliding a driven matter as an actuator for driving a lens, wherein the piezo motor is composed of a lead screw, a stator screwed with the lead screw, and at least two pieces of piezo elements arranged on an outer circumference portion of the stator, the lead screw is a screw bolt having a male thread, the stator is a nut having a female thread hole formed on an inner circumference, and the lead screw and the stator are screwed together in a state capable of screw rotation and applied with repeating screw rotation so that the male thread and the female thread are subjected to a sliding load, wherein the Vickers hardness of a first metal material constituting the male thread of the screw bolt is H