Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-06-28
1997-10-14
Huber, P. W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, G11B 700
Patent
active
056779020
ABSTRACT:
In an optical system including an optical source with an effective aperture for generating a radiation beam to be applied to a data track of an optical storage medium, including optics disposed between the optical source and the data track of the optical storage medium which defines an optical axis along which light is projected to the data track and displacing the optical axis of the return beam to cause it to be substantially outside the effective aperture of the optical source to reduce feedback into the optical source, and a constructive interference beam splitter disposed between the optics and the optical source for producing a beam of light projected along the optical axis and defraction beams and including at least one coating of transparent material selected of a predetermined thickness to cause an increase in the amount of light projected along the optical axis and a desired defraction beam by decreasing light in the non-desired defraction beams.
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Chapter 26 of F. Jenkins et al, "Fundamentals of Optics," McGraw Hill, New York.
L.F. Johnson, "Evolution" of grating profiles under ion-beam erosion, Applied Optics, vol. 18, pp. 2259-2574.
Pp. 172-179 of A. Marchant, "Optical Recording: A Technical Overview," Addison-Wesley, Reading, Mass.
Eastman Kodak Company
Huber P. W.
Owens Raymond L.
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