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A high density optical storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of closely spaced concentric tracks. When a long seek operation is to be provided, track following is suspended and a linear motor drives a galvanometer-contr

A high density optical storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of closely spaced concentric tracks. When a long seek operation is to be provided, track following is suspended and a linear motor drives a galvanometer-controlled mirror to a new position corresponding to a new track called for by the long seek operation. Arrival at the new position is determined by detecting when both the velocity of the linear motor and the difference between current and desired positions are below predetermined maximum values indicating that a stable condition has been reached, after which track following operation is resumed. The linear motor also operates during track following in response to the detected angular position of the mirror so as to cause movement of the mirror in a direction which reduces the mirror deflection required to maintain the beam accurately following the track.

대표청구항 ▼

In a high density data storage system including a recording medium having a plurality of spaced tracks and providing a radiation beam for reading data stored in a track as said beam follows said track, an improved method of providing for movement of said beam over a relatively large number of tracks

In a high density data storage system including a recording medium having a plurality of spaced tracks and providing a radiation beam for reading data stored in a track as said beam follows said track, an improved method of providing for movement of said beam over a relatively large number of tracks using a long seek positioning means, said method comprising the steps of: moving said beam in a controlled track following relationship with respect to a track on said medium; disabling said controlled track following relationship when said beam is to be moved to a different track; generating a feedback signal representing the difference between the current and desired positions of said long seek positioning means; moving said long seek positioning means in response to the generated feedback signal; detecting the arrival of said long seek positioning means at its final position in response to both the velocity of movement of said beam and the difference between current and desired positions being below predetermined maximum values; and enabling said controlled track following relationship after detecting arrival of said long seek positioning means at its final position.