| 摘要 |
A method for measuring the speed of movement during beam track movement in an optical memory apparatus which moves a beam spot on a rotating optical recording medium, a beam spot is received from the optical recording medium and it is detected when the beam spot crosses a track. The number of the detected track crossings of the beam spot during a predetermined time are detected, and the interval of the detected track crossings is measured. The remainder time from the time when a track crossing is detected to the end of the predetermined time is counted, and the amount of movement of the beam spot in the predetermined time from the number of tracks counted, the time of the track crossing interval detected, and the remainder time detected, is measured.
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