Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1979-12-14
1981-07-28
Moffitt, James W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
310313R, 310334, 369131, 369132, 369137, 369173, 369 47, G11B 300, H04R 1704
Patent
active
042814073
ABSTRACT:
A surface acoustic wave (SAW) pickup and record stylus is constructed from an elongated substrate which supports the propagation of SAW. The substrate is tapered to a tip at one end and a fan-shaped interdigital electrode structure having curved fingers is formed thereon. During operation in the pickup mode a beam of SAW is focused to the tip of the stylus which is arranged in contact with a record medium. During playback, the beam reflected by the record medium generates a signal in the interdigital electrode of the stylus representative of the acoustic conditions at the stylus tip and, correspondingly, of the information recorded on the record medium surface. In the record mode the stylus is brought into contact with a record medium. During recording, the input power applied to the interdigital electrode is increased to effect a deformation of the surface of the record medium representative of the information to be recorded.
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Toda et al., "Surface Acoustic Wave Absorber and Application to Low Spurious Mode SAW Device," Trans. IECE Japan, vol. E60, No. 5, pp. 237-238, May 1977.
Smith et al., "Analysis of Interdigital Surface Wave Transducers by Use of an Equivalent Circuit Model," IEEE Trans. Microwave Theory and Tech., pp. 856-864, Nov. 1969.
Hickernell, "DC Triode Sputtered Zinc Oxide Surface Elastic Wave Transducers," J. Appl. Physics, vol. 44, No. 2, Mar. 1973.
McElheny Jr. Donald
Moffitt James W.
RCA Corporation
Roehling J. E.
Tripoli J. S.
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