Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-07-24
1997-10-28
Edun, Muhammad N.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369277, 369278, 369 54, 369100, G11B 724
Patent
active
056823754
ABSTRACT:
Disclosed herein is an information recording medium to be illuminated with an optical radiation beam, comprising a substrate having a surface provided with a preformat comprising a servo track and forming a sectional shape, in transverse to the track, which comprises a concavity provided between two convexities, each having a flat top, and a light reflecting layer being formed by application of a coating liquid over the surface of the substrate, wherein the concavity has the sectional shape of an open trapezoid having a rectangular part, the trapezoidal part has a pair of parallel opposite sides and a pair of sloping sides constituting walls of the trapezoidal part, one of the parallel sides constituting the bottom of the trapezoidal part being shorter than the opposite side, and the rectangular part is adjacent to the side constituting the bottom of the trapezoidal part.
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Canon Kabushiki Kaisha
Edun Muhammad N.
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