Title:
MAGNETO-OPTICAL DISK
Document Type and Number:
Japanese Patent JP3307689
Kind Code:
B2
Abstract:
PURPOSE: To prevent a resin protective layer of a magneto-optical disk from contacting with a floating magnetic head, to prevent a head crash and damage of the resin protective layer caused thereby and to prevent generation of abnormality in the double refractivity on a substrate.
CONSTITUTION: A taped part 6 is provided by flatly cutting the outer circumferential end of the substrate 1 by 0.1 to 0.5mm along the radial direction of the substrate 1, and 0.1 to 0.6mm along the direction of the outer circumferential end face of the substrate 1. When the tapered part is formed to a curved surface, the tapered part-formed region is kept to be 0.1 to 0.5mm along the radial direction of the substrate and the crossing angle with a magneto-optical recording layer-formed surface 5 of the substrate 1 is kept to be 20 to 70°. When these conditions are satisfied, the projection height of the resin protective layer generated on the outer circumferential end part of the substrate is ≤5μm, thereby eliminating contact with the floating magnetic head. Further, when the size of the tapered part is kept with in this range, a harmful influence, such as abnormality in the double refractivity, is not exerted upon the substrate 1.
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Inventors:
Minato Minsei
Go Kyoda
Toshiyuki Shibata
Go Kyoda
Toshiyuki Shibata
Application Number:
JP25420192A
Publication Date:
July 24, 2002
Filing Date:
August 28, 1992
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
G11B11/10; G11B11/105; (IPC1-7): G11B11/105
Domestic Patent References:
| JP472322U | ||||
| JP1181129U | ||||
| JP4105823U |
Attorney, Agent or Firm:
Akira Shioiri (1 person outside)