Patent ID: 6765336
Filing Date: 2004-07-20
Classification: B23Q

Abstract:
A precision positioning unit comprising a table on which an article is to be placed, a linearly movable rod which is connected with the table at one end or a vicinity thereof and further connected with a rod actuating device at another end or a vicinity thereof, said rod actuating device capable of linearly moving the rod forward and backward, comprising:the rod is connected with the rod actuating device via cushion mechanism; and by the side of the rod is placed a rod movement control device comprising an elastic member, an ultrasonic transducer, and an ultrasonic emitting surface, the elastic member being constituted to push the ultrasonic emitting surface to a side surface of the rod when the ultrasonic transducer is inactive, and the ultrasonic transducer functioning to draw the ultrasonic emitting surface away from the rod when it is active.