Multiplane information storage system with an improved record ca

Details Multiplane information storage system with an improved record ca Multiplane information storage system with an improved record ca

1993-12-29

1996-04-23

Psitos, Aristotelis

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

3692751, G11B 700

Patent

active

055110576

ABSTRACT:
A reading device (6) and an optical record carrier (5) having at least two information planes (1, 2, 3). The radiation from the record carrier is converted in a detection system (15) into a detection signal (16) which is applied to a detection circuit (17). In order that this circuit can derive the read information from the detection signal in a reliable manner, the interference signals generated by the information planes which are not to be read should comply with a requirement, referred to as the interference requirement, which is characteristic of the detection circuit. Values for the parameters of the record carrier, such as the thickness of the layers between the information planes and the reflection and transmission coefficients of the information planes then follow from this interference requirement.

REFERENCES:
patent: 3855426 (1974-12-01), Bouwhuis
patent: 4219704 (1980-08-01), Russell
patent: 4908813 (1990-03-01), Ojima et al.
patent: 5097464 (1992-03-01), Nizhiuchi et al.
patent: 5202875 (1993-04-01), Rosen et al.
"Principles of Optical Disc Systems" by G. Bouwhuis et al (Hilger, 1985), (pp. 7-45).
"The defocused image of sinusoidal gratings" by W. H. Steel in Optica Acta, vol. 3, No. 9. 2, Jun. 1956, pp. 65-74.

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