Master disc and method for manufacturing magnetic disc using...

Details Master disc and method for manufacturing magnetic disc using... Master disc and method for manufacturing magnetic disc using...

2005-02-22

2005-02-22

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S692100, C428S690000, C428S690000

Reexamination Certificate

active

06858329

ABSTRACT:
A master disc capable of conducting a preformat recording by a magnetic transcription without causing any unevenness over an entire magnetic disc is provided. The master disc is provided with a radial land portion where an array of ferromagnetic thin films is formed and a concave portion against the land portion. The land portion and the concave portion are formed such that the land portion is joined with the surface of the magnetic disc when the present magnetic disc is overlapped on the magnetic disc, and that the concave portion is not contacted with the surface of the magnetic disc, and also that a space surrounded by the surface of the magnetic disc and the concave portion is open to air at a peripheral end portion of the magnetic disc.

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“The Status & Future of Mechanical, Servo & HDI Technologies, Materials for the ninety-third Workshop of Japan Society of Applied Magnetics”, Uematsu, Y. et al., 93-5, pp. 35, 1996.

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