| 摘要 |
PROBLEM TO BE SOLVED: To investigate a limit at which a turned and driven shaft is resonated by a method wherein a disk recording medium, for test, whose center of gravity is deviated from the center of its rotation is set on a reproducing/recording apparatus and the disk recording medium is turned and driven. SOLUTION: One face of a disk medium 1 is a data face 1a on which data is recorded, and the other face is a label face 1b. In addition, a shaft hole 1c to which a shaft used to turn and drive the medium 1 is fitted is formed in the central part. Then, a printing part 2 as a weight is formed on the label face 1b, and, e.g. a silk screen printing operation is used for the printing part 2. When the position and the area (the weight) of the printing part 2 are changed, various kinds of disk recording medium, for test, in which the position of the center of gravity is different are obtained. Then, the various disk recording mediums, for test, in which the position of the center of gravity is different are set on a reproducing/recording apparatus so as to be turned, a disturbance to a disk driving system and to an optical system can be confirmed, and the existence of a resonance generated at the shaft can be confirmed. |
