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Proceedings Paper

An Optical Digital Memory Using Tellurium Sub-Oxide Thin Film Disc
Author(s): Tomio Yoshida; Takec Ohta; Isao Sato; Shunji Ohara
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Paper Abstract

A practical optical digital memory using Tellurium sub-oxide [TeOx (x = 1)] thin film disc has been developed for document and digital image storage. In the recording mode, the reflectivity of TeOx thin film recording layer evaporated on a pregrooved PMMA substrate is changed by the absorption of the irradiated thermal energy of focused recording laser beam and the signal is recorded on the disc in the form of a chain of micron-sized flat and non-deformed dots. The optical memory using a laser diode as a light source is capable of storing up to 700 MBytes in user data on one side of a preformatted and pregrooved disc, 200 mm in diameter with an access time below 0.5 seconds. Input NRZ digital data are converted to 4/5 MNRZ code which has less DC component and recorded on the optical disc rotating at 900 rpm. Recording data speed on the disc is 6.8 Mbps and the length of the shortest bits is 0.8 μm The error rate of less than 10-8 has been achieved by the implementation of an error correction scheme with 5.4 % redundancy.

Paper Details

Date Published: 10 November 1983
PDF: 6 pages
Proc. SPIE 0421, Optical Disks Systems and Applications, (10 November 1983); doi: 10.1117/12.936100
Show Author Affiliations
Tomio Yoshida, Matsushita Electric Industrial Co. (Japan)
Takec Ohta, Matsushita Electric Industrial Co. (Japan)
Isao Sato, Matsushita Electric Industrial Co. (Japan)
Shunji Ohara, Matsushita Electric Industrial Co. (Japan)

Published in SPIE Proceedings Vol. 0421:
Optical Disks Systems and Applications
Edward V. Labudde, Editor(s)

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