Patent ID: 7242661

Claim:
A dielectric information apparatus for reproducing information recorded in a small area of a dielectric substance having a first surface and a second surface which are opposite to each other, comprising: a first electrode that is placed so as to be in contact with the first surface of the dielectric substance and whose tip portion is a predetermined curvature; a second electrode connected to the second surface of the dielectric substance; an alternation signal generating device for generating an alternation signal having a predetermined frequency; a signal applying device for applying the alternation signal to the first electrode; a return electrode for returning a signal resulting from the applying of the alternation signal to the dielectric substance by the first electrode; an oscillating device for generating an oscillation signal on the basis of a capacitance of the dielectric substance and an inductance of an inductor, the capacitance of the dielectric substance being formed between the first electrode and the second electrode and depending on a polarization state of the dielectric substance between the first electrode and the second electrode; a demodulating device for demodulating the oscillation signal; and a signal reproducing device for reproducing the information using a signal demodulated by the demodulating device and the alternation signal, wherein the dielectric substance is a ferroelectric substance.