Servo information recording device and servo information recording method
View Patent ↗There is provided a servo information recording device having a simple structure, being implementable in lower cost, and capable of writing servo information with high reliability and a servo information recording method. The servo information recording device includes a head swingably supported relative to a predetermined swing axis and a head drive section that swings the head within a predetermined zone in the radial direction of the disk medium. The device also has a controller that controls the head drive section and writes the servo information onto a track of the disk medium. Assuming that R is the outer circumferential radius of the disk medium and P is a distance between the center of the disk medium and pivot (swing axis), the swing axis is disposed at a position at which P/R falls beyond about 1.35.
1. A servo information recording device that writes servo information onto a disk medium, comprising:
a head swingably supported relative to a predetermined swing axis;
a head drive section that swings the head within a predetermined zone in the radial direction of the disk medium; and
a controller that controls the head drive section and writes the servo information onto a track of the disk medium, wherein
assuming that R is the outer circumferential radius of the disk medium and P is a distance between the center of the disk medium and the swing axis, the swing axis is disposed at a position at which P/R is greater than or equal to 1.35.
2. A servo information recording device that writes servo information onto a disk medium, comprising:
a head swingably supported relative to a predetermined swing axis;
a head drive section that swings the head within a predetermined zone in the radial direction of the disk medium; and
a controller that controls the head drive section and writes the servo information onto a track of the disk medium, wherein
assuming that R is the outer circumferential radius of the disk medium and P is a distance between the center of the disk medium and the swing axis, the swing axis is disposed at a position at which P/R is greater than or equal to 1.35; and
the controller starts writing the servo information onto the track from a position offset from a predetermined reference phase of the disk medium in the rotation circumferential direction thereof by an amount corresponding to a phase difference between the trajectories of the head of the servo information recording device and a head of a magnetic disk unit in which a disk medium onto which the servo information has been written by the servo information recording device is set.
3. A servo information recording device that writes servo information onto a disk medium, comprising:
a head swingably supported relative to a predetermined swing axis;
a head drive section that swings the head within a predetermined zone in the radial direction of the disk medium; and
a controller that controls the head drive section and writes the servo information onto a track of the disk medium, wherein
the swing axis of the head is disposed at a position at which an angle formed between the rotation radius direction of the head and rotation circumferential direction of the disk medium becomes smaller than an angle defined in a magnetic disk unit at both an outside position in the radial direction of the disk medium and an inside position in the radial direction thereof in the predetermined zone.
4. A servo information recording device that writes servo information onto a disk medium, comprising:
a head swingably supported relative to a predetermined swing axis;
a head drive section that swings the head within a predetermined zone in the radial direction of the disk medium; and
a controller that controls the head drive section and writes the servo information onto a track of the disk medium, wherein
the swing axis of the head is disposed at a position at which an angle formed between the rotation radius direction of the head and rotation circumferential direction of the disk medium becomes smaller than an angle defined in a magnetic disk unit at both an outside position in the radial direction of the disk medium and an inside position in the radial direction thereof in the predetermined zone; and
the controller starts writing the servo information onto the track from a position offset from a predetermined reference phase of the disk medium in the rotation circumferential direction thereof by an amount corresponding to a phase difference between the trajectories of the head of the servo information recording device and a head of the magnetic disk unit in which a disk medium onto which the servo information has been written by the servo information recording device is set.
5. The servo information recording device according to claim 1 , wherein
the servo information recording device is a single-plate servo information recording device that previously writes servo information onto a magnetic disk used in a magnetic disk unit.
6. A servo information recording method that writes servo information onto a disk medium at predetermined phase intervals while swingably supporting a head about a predetermined swing axis and swinging the head within a predetermined zone in the radial direction of the disk medium, wherein
assuming that R is the outer circumferential radius of the disk medium and P is a distance between the center of the disk medium and the swing axis, the swing axis is disposed at a position at which P/R is greater than or equal to 1.35, and
writing operation of the servo information onto the track is started from a position offset from a predetermined reference phase of the disk medium in the rotation circumferential direction thereof by an amount corresponding to a phase difference between the trajectories of the head of the servo information recording device and a head of a magnetic disk unit in which a disk medium onto which the servo information has been written by the servo information recording device is set.
7. A servo information recording method that writes servo information onto a disk medium at predetermined phase intervals while swingably supporting a head about a predetermined swing axis and swinging the head within a predetermined zone in the radial direction of the disk medium, wherein
the swing axis of the head is disposed at a position at which an angle formed between the rotation radius direction of the head and rotation circumferential direction of the disk medium becomes smaller than an angle defined in a magnetic disk unit at both an outside position in the radial direction of the disk medium and an inside position in the radial direction thereof in the predetermined zone, and
writing operation of the servo information onto the track is started from a position offset from a predetermined reference phase of the disk medium in the rotation circumferential direction thereof by an amount corresponding to a phase difference between the trajectories of the head of the servo information recording device and a head of the magnetic disk unit in which a disk medium onto which the servo information has been written by the servo information recording device is set.