11 July 2007 Multilayer optical disk and method of its management for preventing its illegal use
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Proceedings Volume 6620, Optical Data Storage 2007; 662008 (2007); doi: 10.1117/12.738647
Event: Optical Data Storage 2007, 2007, Portland, OR, United States
Abstract
The special shape of the optical disk tracking grooves is proposed. These tracking grooves are similar to the blazed diffraction grating grooves. The grooves structure can be read by the standard optical disk reading equipment. The multilayer optical disk with slant tracking grooves is proposed. These grooves have different planes and angles of inclination for different data layers. This allows to direct the signals reflected from the different data layers to the different photodetectors. The optical disk capacity increases due to excluding space between tracking grooves and due to increasing the number of data layers. Sequential and parallel optical disk reading options are possible. The technique of information pits arrangement is proposed for parallel reading of information from several data layers. For protecting of the optical disk against its illegal use the disk is made partly recordable and an initialization procedure is performed at the user's recording/reproducing device. During the initialization procedure identifying parameters of the user's device are recorded onto recordable layer of the disk. Also, the unique combination of the bits pairs containing both information prerecorded on the optical disk and information about the user's recording/reproducing device is remembered in the special flash memory of the user's device.
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Anatoly M. Smolovich, Miguel A. Cervantes, Valery Chernov, "Multilayer optical disk and method of its management for preventing its illegal use", Proc. SPIE 6620, Optical Data Storage 2007, 662008 (11 July 2007); doi: 10.1117/12.738647; https://doi.org/10.1117/12.738647
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KEYWORDS
Optical discs

Optical tracking

Diffraction gratings

Objectives

Sensors

Photodetectors

Signal detection

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