The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2010
Filed:
Oct. 12, 2006
Minoru Takeda, Tokyo, JP;
Minoru Takeda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method of manufacturing a magnetic disk is provided. The method of manufacturing a magnetic disk includes the step of disposing a plurality of magnetic recording tracks concentrically, each of the magnetic recording track including a data information recording area and a control information recording area, and the step of forming a separation groove between data areas each included in the data information recording area, and in which data is written, wherein, the step of forming a separation groove includes the step of forming a resist layer having an opening corresponding to a pattern of the separation groove by photolithography, and the step of etching to form the separation groove on a surface of a substrate or a material formed on the substrate through the opening of the resist layer, the step of forming the resist layer and the step of etching are performed for both of a front surface and a back surface of the substrate.