Recording/reproducing apparatus with a probe to detect data reco

Details Recording/reproducing apparatus with a probe to detect data reco Recording/reproducing apparatus with a probe to detect data reco

1994-12-14

1996-12-03

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369107, 250306, G11B 900, H01L 2166

Patent

active

055815383

ABSTRACT:
A probe is displaced relative to a recording medium according to a drive voltage. A chip is provided at an end of the probe. The chip serves to form pits and projections on a surface of the recording medium according to a recording voltage (Vp2) and serves to output a current signal responsive to the pits and projections with a reproducing voltage (Vp1) applied. A voltage generator generates the recording voltage and the reproducing voltage based on address and data signals. A sample-hold unit samples at a specified frequency a current signal obtained from a no-recording area of the recording medium by the chip and produces an output voltage signal. A reproducing unit demodulates and reproduces increment and decrement of the current signal obtained from a recording area of the recording medium by the chip. A control unit controls recording and reproduction. The control unit outputs such a drive voltage that the interval between the chip and the recording medium is maintained constant by feedback control based on the voltage signal derived from the sample-hold unit. The control unit controls the recording so that no-recording areas and recording areas are arranged alternately.

REFERENCES:
patent: 5389475 (1995-02-01), Yanagisawa et al.
patent: 5390161 (1995-02-01), Kurihara et al.
patent: 5404349 (1995-04-01), Nose et al.
patent: 5432771 (1995-07-01), Shido et al.
patent: 5471458 (1995-11-01), Oguchi et al.
Nikkei Microdevices, issued Jul. 1991 (the cover page, table, pp. 89-110).

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