Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1984-03-02
1986-09-02
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
318369, 318561, 360106, G11B 2108
Patent
active
046099549
ABSTRACT:
A tracking servo for a disk player controls the movement of a playback head between prerecorded magnetic tracks carried by a magnetic disk. A feedback signal is provided from a timing wheel attached to a cam and gear configuration that connects a dc servomotor to the head. The servo separates the track-to-track movement into two components: one component occurring while the dc motor is energized and another occurring while the dc motor is coasting to a stop, presumably opposite the desired track. The first component of movement continues until the feedback signal corresponds to an intermediate value, which is predetermined for the first movement. At this point the dc motor is turned off but the timing wheel continues to increment the feedback signal as the motor coasts. Should the head be misaligned with respect to the track after the dc motor stops, the final value of the feedback signal is used to modify the intermediate value for the next track-to-track movement. In this way irregularities due to coasting will not accumulate and affect future track-to-track movement.
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Bolton Richard H.
Cloutier Robert P.
Cardillo Raymond F.
Eastman Kodak Company
Garland Steven R.
Woods David M.
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