Patent ID: 6189374
Filing Date: 2001-02-20
Classification: B82Y,G01Q,Y10S

Abstract:
An AFM for analyzing a sample at a predetermined scanning rate in contact mode, the AFM comprising:a self-actuated cantilever having a Z-positioning element disposed thereon and having a tip attached thereto that generally continually contacts the sample during a scanning operation;a first feedback circuit that generates a cantilever control signal in response to vertical displacement of said self-actuated cantilever;a second feedback circuit, responsive to said cantilever control signal, to generate a position control signal, wherein said first feedback circuit is nested within said second feedback circuit; anda Z-position actuator, responsive to said position control signal, to position one of the self-actuated cantilever and the sample to change the spacing between the self-actuated cantilever and the sample.