Substrate of information recording medium

Abstract

Abstract PURPOSE:To prevent the breakage of a groove by providing a formation part for pits, a formation part for grooves, and a plane part in a plane area in series. CONSTITUTION:The substrate of an information recording medium is provided with the formation part where pits p1, p1... are formed with a tracking refer ence signal, the formation part where grooves (g), (g)... are formed to specific depth as the tracking reference signal, and plane parts (f), (f)... in series as shown by an arrow X. Geometric shape variation by the tracking reference signal which is used for tracking control over a recording element and a repro ducing element by a different tracking control system employed by plural kinds of recording and reproduction systems in the recording of an information signal on the information recording medium and in the reproduction of the information signal from the information recording medium is formed previously on the substrate of the information recording medium at both sides of a recording track in a recording area. Consequently, even when a reproducing stylus is used for reproducing an information signal from the information recording medium, a sliding surface does not wear partially to make the sliding surface rugged.

Inventors

• 👤 Ichiro Ueno
• 👤 一郎 上野

Bibliographic Details