| 摘要 |
PURPOSE:To make flaw simulation approximate to actual flaws possible and make measurement of playability of a reproducing optical disk player possible by providing plural printed films of equal line width, length and depth in the direction at right angles to radial direction and nearly parallel to track direction on the reading face of a disk. CONSTITUTION:Plural printed films of equal line width, length and depth are provided in the direction at right angles to radial direction and nearly parallel to track direction on the reading face of a disk. For instance, three printed films 9 of line width 50mum, length 2mm, depth 100mum are attached in the direction at right angles to radial direction and nearly parallel to track direction to form the first flaw simulation 10. Thus, by providing three printed films 9 nearly parallel to track direction, it is possible to obtain omission information nearly proportional to the length of the flaw when reproducing digital signals, and as omitted parts and normal parts exist alternately, for time of several tens of seconds, the first flaw simulation 10 is closely approximate to actual flaw. |
