Optical recording medium and misalignment measuring instrument

Details Optical recording medium and misalignment measuring instrument Optical recording medium and misalignment measuring instrument

2006-05-23

2006-05-23

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S044260, C369S053230, C369S275300

Reexamination Certificate

active

07050386

ABSTRACT:
To provide an optical recording medium and an eccentricity amount detecting device using the same that can detect an eccentricity amount representing a relative displacement amount in a radiation direction between a beam spot irradiated onto the optical recording medium and the optical recording medium. In the optical recording medium, a plurality (N) of servo areas (113) each including a first wobble mark (211) and a second wobble mark (212) and a plurality (N) of data areas for performing information recording and reproduction are arranged alternatively in a circumferential direction. Each of the servo areas is composed of a plurality of servo pattern areas (210ato210c) arranged in the radial direction, which vary in a distance in the circumferential direction between the first wobble mark and the second wobble mark. The plurality of servo pattern areas include the same number of tracks, and the number is less than N/(2×π).

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