| 摘要 |
A card-like optical information recording medium is used to effect recording and/or reproducing of information thereon. Relative movement between the recording medium and an optical head for irradiating the medium with light beam is conducted to record or reproduce information on or from the recording medium. A relative velocity between the optical head and the recording medium caused by the relative movement is detected to check if the velocity is being changed. When it is detected that the relative velocity is being changed as an acceleration or deceleration therebetween, a light spot formed by the optical head on the recording medium is shifted from the current track to another track such as a neighboring or desired track.
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