Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1991-06-13
1993-08-03
Wolff, John H.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 13, 369280, 369283, 430945, 428694, G11B 1304, G11B 700, G11B 724
Patent
active
052335976
ABSTRACT:
A magneto-optical disk according to the present invention has a substrate (12), a recording layer (13) formed on the substrate and an outer layer (14) formed on the recording layer, above which a floating head is hovered. The outer layer is constituted of a protective layer, an antisticking layer for head, having a texture formed on its surface and other layers. The magneto-optical disk is designed such that, when rotated at a constant angular velocity, the thickness of the outer layer (14) is substantially inversely proportional to a radial position r on the magneto-optical disk raised to the 1/2nd power. In the formation of the outer layer, a screen whose meshes become gradually finer from the innermost portion toward the circumferential portion of the magneto-optical disk is employed based on the screen printing technique. Further, photo hardening resin is used as the outer layer, and simply by changing a wavelength or irradiation amount of light to be applied thereto, a texture is readily formed on the surface of the outer layer. By the use of the present invention, stable recording, erasing and re-writing operations are achieved, and it becomes possible to prevent the floating head from sticking to the magneto-optical disk and reduce the cost thereof.
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Katayama Hiroyuki
Nakayama Junichiro
Ohta Kenji
Conlin David G.
O'Connell Robert F.
Rhoa Joseph A.
Sharp Kabushiki Kaisha
Wolff John H.
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