Distance-controlled tunneling transducer and direct access stora

Details Distance-controlled tunneling transducer and direct access stora Distance-controlled tunneling transducer and direct access stora

1991-03-25

1993-05-11

Hille, Rolf

Static information storage and retrieval

Systems using particular element

Magnetostrictive or piezoelectric

365217, 250306, 250307, 257415, G11C 1100, G11C 700, H01L 2722, G01N 2300

Patent

active

052107140

ABSTRACT:
A distance-controlled tunneling transducer comprises a plurality of tunnel tips arranged in an array at a tunneling distance from an electrically conductive surface of a storage medium. Each tip is attached to a respective cantilever beam permitting the distance between each tip and the surface to be individually pre-adjusted electrostatically. Arranged in juxtaposition with each cantilever beam is an active control circuit for adjusting the tip-to-surface distance during operation of the storage unit, thus preventing crashes of the associated tip into possible asperities on the surface of the recording medium. Each control circuit is designed such that its operating voltage concurrently serves to pre-adjust its associated cantilever beam and to maintain the tip-to-surface distance essentially constant.

REFERENCES:
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patent: 4912822 (1990-04-01), Zdeblick et al.
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patent: 5043577 (1991-08-01), Pohl et al.
patent: 5053995 (1991-10-01), Kajimura et al.
patent: 5150392 (1992-09-01), Hohn et al.

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