Patent ID: 6887652
Filing Date: 2005-05-03
Classification: G11B,Y10S

Abstract:
1. A method for producing an optical disk master, comprising the steps of: (a) providing a substrate having a photoresist film provided on a surface thereof; (b) rotating the substrate in a relative relationship with a beam; (c) during a rotation of the substrate, irradiating the photoresist film on the substrate with the beam so as to form a first beam trace in the photoresist film; (d) during a rotation which is subsequent to the rotation during which the first beam trace is formed, further irradiating the photoresist film with the same beam such that the beam partially overlaps the first beam trace, so that a second beam trace is formed in the photoresist film; and (e) completing the optical disk master using the photoresist film, wherein the second beam trace comprises a data region in a track adjacent to the first beam trace.