Patent attributes
The data recording and reproducing device includes a cantilever 11 having a probe h and extending so as to locate the tip of the probe h in the vicinity of a recording film 20, a piezo driving unit 12 for vibrating the cantilever 11, an optical lever 13 for detecting a displacement due to the vibration of the cantilever 11, a Z feedback circuit 33 for performing feedback control for the driving in a direction vertical to the table 21, a write circuit 18 for supplying a recording voltage to the cantilever 11 in response to a recording signal IN, a voltage circuit 16 and a variable bias circuit 17 for applying an AC voltage to the cantilever 11, and a V feedback circuit 34 for performing the feedback control for the bias voltage applied to the cantilever.
