Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1986-12-11
1989-09-12
Faber, Alan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369120, 369 45, 350 9618, G11B 712, G02B 610
Patent
active
048666947
ABSTRACT:
In an optical storage system where an information bearing surface moves relative to a read/write head the latter includes a transparent body in which light beams sent to and from the surface are guided by multiple internal reflections. Beam shaping and focussing is effected by optical elements integrated in the surface of the body at the locations where the internal reflections occur. A distortion free imaging system is obtained with two series-arranged aspheric reflection surfaces which focus the beam on the information bearing surface. The separation of the input and the reflected beam paths is achieved with a polarizing beam splitter and an associated quarter-wave layer. For readout of a magneto-optic information bearing surface a nonperfect polarizing beam splitter is used in connection with a differential detection scheme to increase the signal to noise/ratio.
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E. G. Lean, IBM Technical Disclosure Bulletin, vol. 23, No. 7A, Dec., 1980, pp. 2994-2995, "Flying Optical Head for Disc Applications".
Chadurjian Mark F.
Faber Alan
International Business Machines - Corporation
Limanek Stephen J.
Tomassini James E.
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