Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1991-11-29
1994-02-01
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369116, 369103, 359 11, 359 24, 385124, G11B 700
Patent
active
052837777
ABSTRACT:
A three-dimensional optical recording medium is made of a photo-induced refractive index-changing material or two-photons absorbing material, which is based on photo-dissociation or photopolymerization. An optical information recording apparatus comprises a device for loading a three dimensional recording medium; a device for generating a high coherent optical pulse or a train of partially-coherent optical waves; a device for splitting the optical pulse into two pulse components and causing the two pulse components to propagate in the recording medium from opposite directions to meet at a predetermined three-dimensional position; a device for converging a light beam in the recording medium into a parallel beam; and a device for discretely scanning the meeting position of the pulse components to ensure three-dimensional recording in accordance with information to be recorded. Optical pulses or a train of optical waves are permitted to meet at a predetermined three-dimensional position in such a three-dimensional recording medium whose refractive index changes according to light intensity, thus ensuring three-dimensionally information recording as a discrete distribution of refractive indices at high density.
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Chikuma Kiyofumi
Tanno Naohiro
Toma Teruo
Dunn Drew A.
Dzierzynski Paul M.
Pioneer Electronic Corporation
Tanno Naohiro
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