Patent ID: 6769616
Filing Date: 2004-08-03
Classification: G02B

Abstract:
A MEMS structure, comprising:a first electrode coupled to a first voltage source; a second electrode coupled to a second voltage source; a rotatable frame comprising a third electrode coupled to a third voltage source, the frame being mounted to a support layer to rotate around a first axis; a fourth electrode coupled to a fourth voltage source; a fifth electrode coupled to a fifth voltage source; a rotatable element comprising a sixth electrode coupled to a sixth voltage source, the rotatable element being mounted to the frame to rotate around a second axis; wherein: a first steady voltage difference between the first electrode and the third electrode changes the natural frequency of the structure around the first axis to be at least approximately equal to a scanning frequency of an application around the first axis; a second steady voltage difference between the fourth electrode and the sixth electrode changes the natural frequency of the structure around the second axis to be at least approximately equal to a scanning frequency of the application around the second axis, a first oscillating voltage difference between the second electrode and the third electrode at the first scanning frequency oscillates the rotatable element around the first axis; and a second oscillating voltage difference between the fifth electrode and the sixth electrode at the second scanning frequency oscillates the rotatable element around the second axis.