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Proceedings Paper

Deformation Recording Process In Polymer-Metal Bilayers And Its Use For Optical Storage
Author(s): Jean A. Cornet
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Paper Abstract

A non-antireflective polymer-metal bilayer structure, encapsulated inside a closed cons-truction/is used for digital data storage in the Thomson-CSF Gigadisc. In this paper, a simple model is presented for microdeformation recording in the medium. This model enables a good understanding of the readout signal as a function of the recording power and leads to some practical consequences. Useful polymers and metallic layers are identified and the disc performance is reported. It is shown that recording using laser diodes can be performed at bit rate up to 14 Mbits.s-1 with a laser power of 7 mW at the disc entry face, in case of a 1200 rpm disc speed. Moreover a working range of 4 mW, as defined by a 3 dB attenuation, is demonstrated. Discs from pilot production exhibit raw bit error rates at the level of 2.10-5. For usual environmental conditions, the disc behaviour is compatible with shelf-and archival life at scale of 10 years. Finally, the processes for both layers deposition and disc construction are easy and cost effective. It is concluded that Giaadisc can successfully enter today the market place.

Paper Details

Date Published: 10 November 1983
PDF: 10 pages
Proc. SPIE 0420, Optical Storage Media, (10 November 1983); doi: 10.1117/12.936053
Show Author Affiliations
Jean A. Cornet, Thomson-CSF (France)


Published in SPIE Proceedings Vol. 0420:
Optical Storage Media

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