Optical recording medium and method of evaluating optical...

Details Optical recording medium and method of evaluating optical... Optical recording medium and method of evaluating optical...

2007-10-16

2007-10-16

Tran, Thang V. (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S275300

Reexamination Certificate

active

10493420

ABSTRACT:
A conventional mechanical precision measuring device is used effectively in the measurement of the eccentricity of a high density optical disc. A DVR optical disc2comprises a pattern4of fine depressions and protrusions conformed to the intended format of the disc (a first depressions and protrusions: pits and/or grooves) formed within an information recording area6of the disc, as well as a pattern8of fine depressions and protrusions for measuring the eccentricity (a second depressions and protrusions), which is formed in an area other than the information recording area6, and is formed in accordance with a CD format having lower recording density than that of the format defined for the DVR optical disc2. By using this pattern8of fine depressions and protrusions for mechanical detection, conventional mechanical precision measuring devices designed for the CD family can be used as it is, for measuring the eccentricity (mechanical precision) of the DVR optical disc2.

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