Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-12-04
1999-12-28
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 94, G11B 700, G11B 374
Patent
active
060090650
ABSTRACT:
An optical pickup providing the 3-D reading of the binary optical information from the multilayer fluorescent disk by means of fluorescent sites excitation, is described. The 2-D information at the separate layer is recorded by chemical transformation of the photosensitive material from one stable molecular form A (non fluorescent) to other stable molecular form B (fluorescent) via UV light illumination.
The present invention particularly concerns the methods and apparatus to read the stored memory from the read only 3-D optical memory and includes: (i) only one, focused to the desired layer, reading laser beam, which induces the fluorescence in the whole volume confined within conical surface of focused beam, (ii) active medium which posses the fluorescing properties and is organized in a form of multilayer optical disc, (iii) detection of fluorescence at the wavelength different from the excitation wavelength, (iv) spectral, spatial and electronic filtration of the detected signal in order to extract signal from the noise fluorescence coming from all out-of-focus layers. Utilization of dichroic mirror and/or filter in the optical pickup prevents the photo diode from the reading laser radiation.
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Glushko Boris A.
Levich Eugene B.
Huber Paul W.
OMD Optical Memory Devices Ltd.
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