Reproducer for disc-shape storage medium
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHitoshi Fujimoto, Yoshiharu Kajinami
Life of this patent
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Abstract
A reproducer provided with a vibration value measuring means which has functions of, prior to data reproducing, detecting vibration of, and determining vibration value for, a disc, and which measures a vibration value obtained when the disc with a known mass eccentricity is mounted on the reproducer and is rotated, characterized in that values relating to the measured vibration value are stored in a storage in the reproducer as threshold values indicating allowable limits of the vibration value, thereby preventing unstable vibration detection due to differences between individually manufactured reproducers when a disc with a large mass eccentricity is reproduced at high speed, and permitting a reproducing operation that will not give a user an unpleasant feeling.
Claims20
A disc-shape storage medium reproducer comprising:
- disc rotating means for rotating a storage medium disc having data recorded on a spiral or concentric tracks and having a center hole, said disc rotating means including a spindle to be inserted into said center hole, and being formed in a manner such that said disc can be detachably inserted and that the rotational speed can be varied;
- a signal converter for reading out said data from said disc;
- moving means for moving said signal converter in radial direction of said disc;
- wherein
- values relating to vibration values that are measured with vibration value measuring means by mounting a disc (allowable-limit disc) with a known mass eccentricity into said reproducer and rotating said allowable-limit disc are stored in storage means inside said reproducer as a threshold level that indicates the allowable limit.
A disc-shape storage medium reproducer comprising:
- disc rotating means for rotating a storage medium disc having data recorded on spiral or concentric tracks and having a center hole, said disc rotating means including a spindle to be inserted into said center hole and being formed in a manner such that said disc can be detachably inserted and that the rotational speed can be varied;
- a signal converter for reading out said data from said disc;
- moving means for moving said signal converter in the radial direction of said disc;
- vibration value measuring means for measuring vibration obtained by rotating said disc;
- storage means for storing data relating to allowable-limit vibration value as threshold level;
- comparing means for comparing said threshold level with the data relating to the vibration value measured by said vibration value measuring means;
- and
- judging means for judging whether or not said data relating to the measured vibration value is within an allowable range set by said threshold level;
- wherein
- the data relating to said allowable vibration-limit value is stored in advance in said storage means as a threshold level for criterion, said threshold level for criterion is compared by said comparing means with the data relating to the vibration value obtained by rotating said allowable-limit disc using a disc with a known mass eccentricity as an allowable-limit disc, and when judgment is made by said judging means that the vibration value is outside the allowable range, said threshold for criterion is changed.
Dependencies are inferred from the claim text.