Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1989-08-30
1991-05-14
Psitos, Aristotelils M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7811, 369 32, G11B 555, G11B 2108
Patent
active
050161261
ABSTRACT:
A device for controlling an access operation of an information recording and reproducing device to a target position for rough access in a disk-shaped recording medium prior to a precision access to a final target position, including a head carried by an actuator, a scale, a counter, a comparator, a timer, and a controller. The scale emits pulses while the head is traveling. The counter counts the pulses and then provide the count to the comparator, which calculates a difference between the count and an access distance to be traveled for rough access and then compares the difference with a value which is determined in advance in consideration of a tolerable error. The comparison result is input into the controller. If the comparison result received when the timer finishes measuring the specified time indicates that the difference between the access distance and the count falls within the range of the predetermined value, the controller decides that the actual rough access operation has been normally finished as desired, thereby decreasing a wrong judgement with respect to finish of the rough access irrespective of a value counted by the counter.
REFERENCES:
patent: 3699555 (1972-10-01), Du Vall
patent: 4954909 (1990-09-01), Sengoku
Horie Nobuyuki
Nishioka Yoshiki
Yamanaka Toshihiro
Yuki Yoshio
Garland Steven R.
Psitos Aristotelils M.
Sharp Kabushiki Kaisha
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