Optical disk arrangement with closed contours whose entire exten

Details Optical disk arrangement with closed contours whose entire exten Optical disk arrangement with closed contours whose entire exten

1987-09-09

1989-09-19

Pisitos, Aristotelis M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

358342, 369109, 369111, G11B 7007, G11B 724

Patent

active

048688088

ABSTRACT:
The present invention relates to systems for reproducing signals, from a record whose engraved surface contains a recorded track in the form of an embossed print made of diffractive elements, representing the time variation of a pulse time modulated waveform. In accordance with the invention, there is provided a record and an optical read-out device wherein the relief elements carried by the record have a width in the order of the wavelength of the concentrated read-out radiation for determining a spatial variation in the diffracted energy emerging from the illuminated portion of the record, this variation being detected with photo-electric elements.

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