US 5,184,257 AGranted

Head positioning control for a spindle motor disk drive

AssigneeSeiko Epson Corporation

InventorsYoshiro Koga, Akihiro Gomi, Takashi Miyasaka, Yasunaga Miyazawa, Kenichi Endo, Junichiro Shinozaki, Kaneo Yoda, Takashi Ichikawa, Hitoshi Miyasaka, Chiharu Kaburagi

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Abstract

A disk drive includes a data recording disk and disk head for recording data and reproducing data from the disk. Arms support the disk head. An actuator drives the arm moving the disk head to a predetermined data recording track of the disk. A spindle motor rotates the disk. An actuator unit moves the disk head to select a track on the disk. First positioning data for positioning the disk head is provided on at least one data surface. Second positioning data is provided at at least one data surface. A control is coupled to the actuator for controlling the positioning of the disk head and the searching of the disk in response to the first and second positioning data. The second positioning data may be located on positioning tracks not used for data. The second positioning information as part of a second positioning data is stored. The disk head position is compensated by the stored second positioning information which is superimposed with the first position data.

Claims29

Dependent claims

A magnetic recording device comprising:

a spindle;
at least one magnetic disk mounted in spaced relationship along the spindle, a plurality of tracks formed on said at least one magnetic disk;
head means for recording and reproducing data on said at least one magnetic disk;
actuator means for moving the head means to selected tracks on said at least one magnetic disk;
first positioning means providing first positioning data for positioning said head means;
the at least one magnetic disk being formed with at least one data surface, second positioning data being formed on the at least one data surface for positioning said head means;
and
control means coupled to the actuator means for controlling the positioning of the head means in response to the first and second positioning data, said head means including a plurality of data heads, the control means being adapted to position each data head by superimposing second positioning information derived from the second positioning data on first positioning information derived from said first positioning data;
said control means including adding means for superimposing the second positioning information on the first positioning information;
the control means being adapted to add the second positioning information gradually to the first positioning information prior to the settling of the first positioning means to a destination track.

7 more elements

A magnetic recording device comprising:

a spindle;
at least one magnetic disk having a plurality of tracks formed thereon mounted in spaced relationship along the spindle,
head means for recording and reproducing data on the at least one magnetic disk;
actuator means for moving the head means to selected tracks on said at least one magnetic disk;
first positioning means providing first positioning data for positioning said head means;
the at least one magnetic disk being formed with at least one data surface, second positioning data formed on said at least one data surface for positioning said head means;
control means coupled to the actuator means for controlling the positioning means in response to the first and second positioning data;
said control means including speed control means responsive to the first positioning data and providing an output for causing said actuator means to displace said head means to a position less than one track spacing from a destination track;
adder means for superimposing second positioning information on said first positioning information and outputting said superimposed positioning information to said actuator means during at least the portion of the displacement of the head means adjacent the destination track;
and switch means for selectively applying one of the output of said speed control means and adder means to said actuator means;
and
said second positioning information being gradually superimposed on said first positioning information as said head means approaches the destination track.

9 more elements

A magnetic recording device comprising:

a spindle;
at least one magnetic disk having a plurality of tracks formed thereon, mounted in spaced relationship along the spindle;
head means for recording and reproducing data on the at least one magnetic disk;
actuator means for moving the head means to selected tracks on said at least one magnetic disk;
first positioning means providing first positioning data for positioning said head means;
the disk being formed with at least one data surface, second positioning data formed on the at least one data surface for positioning said head means;
control means coupled to the actuator means for controlling the positioning of the head means in response to the first and second positioning data;
said control means including speed control means responsive to the first positioning data and producing an output for causing said actuator means to displace said head means to a position less than one track spacing from a destination track;
adder means for superimposing second positioning information on said first positioning information and outputting said superimposed positioning information to said actuator means during at least the portion of the displacement of the head means adjacent the destination track;
and switch means for selectively applying one of the output of said speed control means and adder means to said actuator means;
and
said second positioning data being stored on a plurality of data tracks, said control means including average circuit means for receiving and averaging second positioning information from a plurality of tracks for producing average second positioning information for application to the actuator means.

9 more elements

A magnetic recording device comprising:

a spindle;
at least one magnetic disk, having a plurality of tracks formed thereon, mounted in spaced relationship along the spindle;
head means for recording and reproducing data on the at least one magnetic disk;
actuator means for moving the head means to selected tracks on said at least one magnetic disk;
first positioning means providing first positioning data for positioning said head means;
the disk being formed with at least one data surface, second positioning data being formed on said at least one data surface for positioning head means;
control means coupled to the actuator means for controlling the positioning of the head means in response to the first and second positioning data;
said control means including speed control means responsive to the first positioning data and producing an output for causing said actuator means to displace said head means to a position less than one track spacing from a destination track;
adder means to superimposing second positioning information on said first positioning information and outputting said superimposed positioning information to said actuator means during at least the portion of the displacement of the head means adjacent the destination track;
and switch means for selectively applying one of the output of said speed control means and adder means to said actuator means;
and
the second positioning data being repeated a plurality of times on at least one positioning track on each of said at least one data surface, said control means including averaging means for averaging the second positioning information derived from the second positioning data on each track and applying the average second positioning information to the actuator means.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/807,767Filed 6 Dec 1991 · continuation
Priority: JP 60-28218916 Dec 1985
Granted: 2 Feb 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification2 codes

G11B 5/5552
Across disk tracks: using fine positioning means for track acquisition separate from the coarse positioning means
G11B
Information storage based on relative movement between record carrier and transducer

Family

Serial93,201Parent of this continuation-in-part · filed 15 Dec 1986
Serial107,722Parent of this continuation · filed 7 Oct 1987
Serial481,755Parent of this division · filed 15 Feb 1990
Serial643,243Parent of this continuation · filed 8 Feb 1991
US 5,023,733 AParent of this division
US 5,184,257 AThis patent

From the US filing history. Foreign family members aren’t listed.