Dynamic information storage or retrieval – Specific detail of information handling portion of system – Mechanical modification or sensing of storage medium
Patent
1982-07-13
1984-02-28
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Mechanical modification or sensing of storage medium
369135, 369130, 310313R, 310334, G11B 300, H04R 1704
Patent
active
044344813
ABSTRACT:
A multi-electrode array deposited on a piezoelectric substrate is driven by a traveling-wave voltage generated from a wave delay generating device, such as a tapped coaxial cable. Suitably delayed and phased voltages are fed to each electrode in the array. Surface acoustic waves are excited on the surface of the piezoelectric substrate. The surface acoustic waves travel through the array in proper phase with the exciting signal supplied to the electrodes. The surface acoustic waves pick up energy as they travel along the surface. Such a structure has a number of advantages over the prior art conventional interdigital transducers. For example, they exhibit broad bandwidth characteristics, have high conversion efficiency and are generally free of spurious signals. These advantages make them well suited for application to video disc cutterheads.
REFERENCES:
patent: 3842194 (1974-10-01), Clemens
patent: 4035590 (1977-07-01), Halter
patent: 4281407 (1981-07-01), Tosima
Journal Article-- "Excitation of Elastic Surface Waves with Wideband Frequency Characteristics", (Shibayama et al.).
Shima Eiji
Toda Minoru
Meise W. H.
Psitos Aristotelis M.
RCA Corporation
Roehling J. E.
Whitacre E. M.
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