High-density recording medium and recording and/or...

Dynamic optical information storage or retrieval – Optical storage medium structure – Disk protection

Reexamination Certificate

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C369S280000

Reexamination Certificate

active

07617507

ABSTRACT:
A high-density recording medium, and a recording and/or reproducing device are provided. At a transition area of the high-density recording medium allocated between a clamping area and an information area of the high-density recording medium is formed a step having a prescribed slope so that the high-density recording medium does not collide with an objective lens of an optical pickup provided in an optical disc device although the objective lens of the optical pickup is upwardly moved toward a recording layer of the high-density recording medium.

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Narahara Tatsuya at al. “Optical Disc System for Digital Video Recording” Japanese Journal of Applied Physics vol. 39 (2000) pp. 912-919, Part 1, No. 2B. XP-001005912.

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