1-15. (canceled)
16. A bearing component for a piston rod of a drug delivery device, comprising:
a contact surface of the bearing component,
a periphery of the bearing component surrounding a centre, and
a coupling feature arranged inside the periphery for rotatably engaging a component of a piston rod perpendicular to the contact surface,
characterized in that
the coupling feature includes a flexible feature extending from the periphery towards the centre, and
the flexible feature is arranged to be deflected towards the periphery by a force exerted on the flexible feature in a direction towards the contact surface and deflected towards the centre by a force exerted on the flexible feature in the opposite direction.
17. The bearing component according to claim 16, wherein the flexible feature has sloping surfaces inclined with respect to the contact surface, the sloping surfaces approaching the contact surface towards the centre.
18. The bearing component according to claim 16, wherein the flexible feature is an integral part of the bearing component.
19. The bearing component according to claim 16, wherein the flexible feature is formed by at least one flexible arm, hook, prong, tooth or salient element.
20. The bearing component according to claim 16, wherein
the centre comprises an opening, and
the flexible feature limits the opening.
21. The bearing component according to claim 16, wherein the opening is enlarged when the flexible feature is deflected towards the periphery.
22. The bearing component according to claim 16, wherein
the flexible feature is arranged such that the bearing component is symmetrical with respect to rotations by 180\xb0 around the centre.
23. A piston rod comprising a bearing component according to claim 16.
24. The piston rod according to claim 23, wherein the component of the piston rod that is rotatably engaged by the flexible feature is a lead screw.
25. The piston rod according to claim 23, wherein the component of the piston rod that is rotatably engaged by the flexible feature comprises a coupler having an overhanging flange, and the bearing component engages the coupler with the flexible feature stopping the flange.
26. The piston rod according to claim 23, wherein the component of the piston rod that is rotatably engaged by the flexible feature contacts the bearing component at least in a contact area near the periphery of the bearing component.
27. A drug delivery device comprising a bearing component according to claim 16.
28. The drug delivery device of claim 27, wherein the bearing component is mounted to a component of a piston rod.
29. The drug delivery device of claim 27, the drug delivery device being an injection device.
30. The drug delivery device of claim 27, the drug delivery device being a pen-type device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A disk drive comprising:
a magnetic disk medium including servo regions, in which servo information for position detection of a head performing recording and playback of user data is embedding-recorded by discrete track recording method, the servo information including a preamble section, a cylinder address code section, and phase-difference burst pattern sections to detect an offtrack amount, one phase-difference servo burst pattern section being provided in each of the servo regions, a servo burst pattern having an inclined direction corresponding to a direction of an inline angle of the head and a phase which gradually delays toward an internal periphery of the disk medium and gradually advances towards an external periphery of the disk medium;
a read head which is included in the head and reads the servo information and the user data from the magnetic disk medium; and
control means for performing positioning control of the head in accordance with the servo information played back from the servo regions by using the read head.
2. The disk drive according to claim 1, wherein
the servo burst pattern of the phase-difference servo burst pattern section in the magnetic disk medium is formed such that a radius position having the same phase as a phase of the preamble section is in almost the center of the same cylinder code in the cylinder address code section.
3. The disk drive according to claim 1, wherein
the servo burst pattern of the phase-difference servo burst pattern section in the magnetic disk medium has an inclined cycle of phase difference which is 2 or 4 times as wide as a servo pitch, and which allows a shadow of a detection range of the read head to be completely buried in the servo burst pattern when the detection range of the read head is projected onto the magnetic disk medium.
4. The disk drive according to claim 1, wherein
the magnetic disk medium records the servo information and the user data by perpendicular magnetic recording.
5. A magnetic disk medium being incorporated in a disk drive having a read head to read servo information and user data, the magnetic disk medium comprising:
servo regions, in which the servo information for position detection of the read head is embedding-recorded by discrete track recording method,
the servo information including a preamble section, a cylinder address code section, and phase-difference burst pattern sections to detect an offtrack amount,
one phase-difference servo burst pattern section being provided in each of the servo regions, the servo burst pattern having an inclined direction corresponding to a direction of an inline angle of the head and a phase which gradually delays toward an internal periphery of the disk medium and gradually advances towards an external periphery of the disk medium.
6. The magnetic disk medium according to claim 5, wherein
the servo burst pattern of the phase-difference servo burst pattern section in the magnetic disk medium is formed such that a radius position having the same phase as a phase of the preamble section is in almost the center of the same cylinder code in the cylinder address code section.
7. The magnetic disk medium according to claim 5, wherein
the servo burst pattern of the phase-difference servo burst pattern section has an inclined cycle of phase difference which is 2 or 4 times as wide as a servo pitch, and which allows a shadow of a detection range of the read head to be completely buried in the servo burst pattern when the detection range of the read head is projected onto the magnetic disk medium.
8. The magnetic disk medium according to claim 5, wherein
the magnetic disk medium records the servo information and the user data by perpendicular magnetic recording.