Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1988-11-08
1990-09-25
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318480, 318601, 318602, 250233, 340671, 360 7703, H02P 546, G05B 1928
Patent
active
049595997
ABSTRACT:
An apparatus for positioning a recording or playback head over a rotating recording medium, such as a magnetic disk. When access to a desired track is attempted, the head is quickly moved and placed within a range close to the track under open loop control. When the head enters the range close to the desired track, the head control is switched to servo feed under closed loop control. During the servo feed, the head is moved according to a head position signal representing the actual position of the head, the head position signal being given by a head position detector having a portion moving together with the head. The head is thus directed to a predetermined position according to an error signal corresponding to the deviation of the head position. When the head has passed through the desired position, driving force in the reverse direction is generated and the head is forced back toward the desired position. The head thus oscillates around the desired position but converges to it.
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Kaneko Kiyotaka
Miyake Izumi
Nakadai Katsuo
Oda Kazuya
Fuji Photo Film Co. , Ltd.
Ip Paul
Shoop Jr. William M.
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