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US 2006/0222967 A1Published application
Reticle, method for manufacturing magnetic disk medium using reticle, and magnetic disk medium
AssigneeKabushiki Kaisha Toshiba
InventorsTakeshi Okino, Seiji Morita, Masatoshi Sakurai, Shinobu Sugimura
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Abstract
It is made possible to obtain a reticle which has a high strength even it is formed in a doughnut shape, a method for manufacturing a magnetic disk medium using the reticle, and a magnetic disk medium using the same. The magnetic disk medium has a toroidal pattern pattern. A pattern positioned at a central portion of the toroidal pattern is provided with an opening portion and a non-opening portion.
Claims20
A reticle comprising a toroidal pattern, a pattern of a central portion of the toroidal pattern including an opening portion and a non-opening portion.
Dependencies are inferred from the claim text.