Multi-layer recording medium

Abstract

Abstract PURPOSE:To attain multiple recording with high density by forming an optical guide track on each recording layer in a multi-layer optical recording medium where plural recording layers are overlapped via a transparent medium separating layer. CONSTITUTION:A recording layer 16a comprising a guide track forming thin film 12a and an optical recording material thin film 13a is formed on a substrate 11 on which a recording medium is formed and a medium separating layer 14 is formed on the layer 16a. Moreover, a recording layer 16b comprising a guide track forming thin film 12a and an optical recording material thin film 13b is formed on the medium separating layer 14, and a protection layer 15 is formed on the layer 16b. A recessed groove 17 as an optical guide track is formed respectively to the guide track forming thin films 12a, 12b respectively and the recessed groove is formed also on the optical recording medium thin films 13a, 13b. Since the optical guide track is formed on each recording layer, the limit of the recording density of a conventional optical recording medium is improved remarkably and a specific position of the desired recording layer is accessed easily.

Inventors

• 👤 Akira Morinaka
• 👤 森中　彰
• 👤 Shigeru Oikawa
• 👤 及川　茂

Bibliographic Details