Micro stage using piezoelectric element

A micro stage comprising:

• a body having a vertically perforated through-hole passing through a central portion thereof;
• a bobbin including a tip portion of the bobbin at one end of the bobbin with an electron emission tip embedded in a center thereof, and passing through the through-hole of the body to be moved in the through-hole along a first axis perpendicular to a vertical direction wherein the bobbin includes a flange having a diameter greater than a diameter of the through-hole of the body;
• a first piezoelectric element disposed on the body and to be lengthened when a voltage is applied thereto to push the bobbin in one direction along the first axis;
• a second piezoelectric element disposed on the body and to be lengthened when a voltage is applied thereto to push the bobbin in another direction along the first axis;
• and
• an upper cover that is coupled to an upper portion of the body and that has a through-hole, through which the bobbin passes and communicates with the through-hole of the body wherein the upper cover includes pressing means that presses the flange of the bobbin to limit movement of the bobbin, such that the bobbin is to be moved along the first axis by only the first piezoelectric element and the second piezoelectric element,
• wherein the bobbin is to be positioned along the first axis by adjusting the voltages applied to the first piezoelectric element and the second piezoelectric element,
• wherein, when the voltages applied to the first and second piezoelectric elements are removed, the first and second piezoelectric elements are shortened again to separate from the bobbin so that movement of the bobbin due to unstable noise generated by the voltage applied to the piezoelectric elements is reduced.