An Optical Digital Memory Using Tellurium Sub-Oxide Thin Film Disc

Tomio Yoshida; Takec Ohta; Isao Sato; Shunji Ohara

doi:10.1117/12.936100

10 November 1983 An Optical Digital Memory Using Tellurium Sub-Oxide Thin Film Disc

Tomio Yoshida, Takec Ohta, Isao Sato, Shunji Ohara

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Proceedings Volume 0421, Optical Disks Systems and Applications; (1983) https://doi.org/10.1117/12.936100
Event: 1983 Optical Mass Data Storage Conferences, 1983, Arlington, United States

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.

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Tomio Yoshida, Tomio Yoshida, Takec Ohta, Takec Ohta, Isao Sato, Isao Sato, Shunji Ohara, Shunji Ohara, "An Optical Digital Memory Using Tellurium Sub-Oxide Thin Film Disc", Proc. SPIE 0421, Optical Disks Systems and Applications, (10 November 1983); doi: 10.1117/12.936100; https://doi.org/10.1117/12.936100

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