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US-12626719-B2 - Disk device with stopper for actuator assembly

US12626719B2US 12626719 B2US12626719 B2US 12626719B2US-12626719-B2

Abstract

According to one embodiment, a disk device includes a disk-shaped recording medium, an actuator assembly, a magnetic head supported in the actuator assembly, a first stopper which is provided contactably with the actuator assembly and defines a move of the actuator assembly in a first direction, and a first auxiliary stopper which is provided at a position where the actuator assembly comes into contact with the first auxiliary stopper after the actuator assembly comes into contact with the first stopper, and which defines the move of the actuator assembly in the first direction.

Inventors

  • Kenji Hayasaka

Assignees

  • KABUSHIKI KAISHA TOSHIBA
  • TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

Dates

Publication Date
20260512
Application Date
20240712
Priority Date
20240426

Claims (14)

  1. 1 . A disk device comprising: a disk-shaped recording medium; an actuator assembly which is pivotably provided; a magnetic head supported in the actuator assembly; a first stopper which is provided contactably with the actuator assembly and defines a move of the actuator assembly in a first direction; and a first auxiliary stopper which is provided at a position where the actuator assembly comes into contact with the first auxiliary stopper after the actuator assembly comes into contact with the first stopper, and which defines the move of the actuator assembly in the first direction.
  2. 2 . The disk device of claim 1 , wherein the first stopper comprises an elastic buffer member which is provided contactably with the actuator assembly, and the first auxiliary stopper is provided at a position where the first auxiliary stopper comes into contact with the actuator assembly before the buffer member completely elastically deforms in the first direction.
  3. 3 . The disk device of claim 1 , further comprising a housing comprising: a base in which the recording medium and the actuator assembly are provided; and a cover with which an opening of the base is closed, wherein the first stopper is provided in the base, and the first auxiliary stopper is provided on the cover.
  4. 4 . The disk device of claim 3 , wherein the housing comprises a gasket held between the base and the cover, and the first auxiliary stopper is formed of a material of the gasket, and is provided on an inner surface of the cover.
  5. 5 . The disk device of claim 3 , wherein the actuator assembly includes an actuator block pivotably supported in the base, an arm and a suspension extending from the actuator block to a recording medium side, the magnetic head supported at an extension end of the suspension, and a support frame extending from the actuator block in a direction opposite to the arm, the first stopper is provided at a position where the first stopper is contactable with the support frame, and the first auxiliary stopper is provided at a position where the first auxiliary stopper is contactable with the arm.
  6. 6 . The disk device of claim 3 , wherein the actuator assembly includes an actuator block having a contact surface and pivotably supported in the base, an arm and a suspension extending from the actuator block to a recording medium side, the magnetic head supported at an extension end of the suspension, and a support frame extending from the actuator block in a direction opposite to the arm, the first stopper is provided at a position where the first stopper is contactable with the support frame, and the first auxiliary stopper is provided at a position where the first auxiliary stopper is contactable with the contact surface of the actuator block.
  7. 7 . The disk device of claim 1 , further comprising a housing comprising: a base in which the recording medium and the actuator assembly are provided; and a cover with which an opening of the base is closed, wherein the first stopper is provided in the base, and the first auxiliary stopper is provided in the base.
  8. 8 . The disk device of claim 1 , further comprising: a second stopper which is provided contactably with the actuator assembly and defines a move of the actuator assembly in a second direction opposite to the first direction; and a second auxiliary stopper which is provided at a position where the actuator assembly comes into contact with the second auxiliary stopper after the actuator assembly comes into contact with the second stopper, and which defines the move of the actuator assembly in the second direction.
  9. 9 . The disk device of claim 8 , wherein the second stopper comprises an elastic buffer member which is provided contactably with the actuator assembly, and the second auxiliary stopper is provided at a position where the second auxiliary stopper comes into contact with the actuator assembly before the buffer member of the second stopper completely elastically deforms in the second direction.
  10. 10 . The disk device of claim 8 , further comprising a housing comprising: a base in which the recording medium and the actuator assembly are provided; and a cover with which an opening of the base is closed, wherein the second stopper is provided in the base, and the second auxiliary stopper is provided on the cover.
  11. 11 . The disk device of claim 10 , wherein the actuator assembly includes an actuator block pivotably supported in the base, an arm and a suspension extending from the actuator block to a recording medium side, the magnetic head supported at an extension end of the suspension, and a support frame extending from the actuator block in a direction opposite to the arm, the second stopper is provided at a position where the second stopper is contactable with the support frame, and the second auxiliary stopper is provided at a position where the second auxiliary stopper is contactable with the arm.
  12. 12 . The disk device of claim 8 , further comprising a housing comprising: a base in which the recording medium and the actuator assembly are provided, and a cover with which an opening of the base is closed, wherein the second stopper is provided in the base, and the second auxiliary stopper is provided in the base.
  13. 13 . The disk device of claim 1 , wherein the first stopper comprises a stopper pin and an elastic buffer member which is attached to the stopper pin and provided contactably with the actuator assembly.
  14. 14 . A disk device comprising: a disk-shaped recording medium; an actuator assembly which is pivotably provided; a magnetic head supported in the actuator assembly; a first stopper which is provided contactably with the actuator assembly and defines a move of the actuator assembly in a first direction; and a first auxiliary stopper which is separated from the first stopper and provided at a position where the actuator assembly comes into contact with the first auxiliary stopper after the actuator assembly comes into contact with the first stopper, and which defines the move of the actuator assembly in the first direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2024-072308, filed Apr. 26, 2024, the entire contents of which are incorporated herein by reference. FIELD Embodiments described herein relate generally to a disk device. BACKGROUND As a disk device, for example, a hard disk drive (HDD) comprises a rotatable magnetic disk provided in a housing, and a pivotable actuator assembly (head suspension assembly [HSA]) which supports a magnetic head. In the housing, inner and outer stoppers which restrict the moving range of the actuator assembly are provided. Regarding the actuator assembly, its move is stopped when it collides with the stoppers, and thus, the move is restricted to a predetermined moving range. This configuration prevents the collision between the magnetic head and the other components and the deviation of the magnetic head from a ramp. To reduce the shock applied at the time of the collision of the actuator assembly, each stopper comprises a buffer member which can elastically deform. When the actuator assembly collides with the above stoppers, the stoppers elastically deform. The amount of displacement (the mount of deformation) changes based on the materials of the stoppers, the contact positions and the collision speeds. Therefore, the contact margin between the actuator assembly and the other components such as a magnetic circuit and a recording medium needs to be sufficiently assured based on the maximum amount of displacement. An increase in the contact margin leads to the reduction in the data area of the recording medium and the design constraint of the other components. In addition, the buffer members of the stoppers may become the generation source of outgassed components and cause the contamination of the magnetic head and the magnetic disk. These problems detrimentally affect the reliability and life of the magnetic disk device. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a hard disk drive (HDD) in which a top cover is removed according to a first embodiment. FIG. 2 is a plan view of the HDD. FIG. 3 is a perspective view showing the head actuator assembly and FPC unit of the HDD. FIG. 4 is a perspective view of the HDD in a state where the head actuator assembly, the FPC unit and an upper yoke are removed. FIG. 5 is a perspective view of an inner stopper (second stopper). FIG. 6A is a perspective view of an outer stopper (first stopper). FIG. 6B is a longitudinal sectional view of the outer stopper (first stopper). FIG. 7 is a diagram showing the relationship between the amount of overtravel and the temperature at the time of the collision of the inner stopper according to the embodiment. FIG. 8 is a diagram showing the relationship between the amount of overtravel and the temperature at the time of the collision of the outer stopper according to the embodiment. FIG. 9 is a perspective view showing the layout relationships of the inner surface of the top cover, a head actuator and auxiliary stoppers. FIG. 10 is a cross-sectional view of the top cover and the auxiliary stopper. FIG. 11 is a plan view showing the actuator assembly and a housing in a state where the actuator assembly collides with the outer stopper. FIG. 12 is a perspective view showing the actuator assembly, the outer stopper and the auxiliary stopper. FIG. 13 is a plan view showing the actuator assembly and the housing in a state where the actuator assembly collides with the inner stopper. FIG. 14 is a perspective view showing the layout relationships of the inner surface of the top cover, the actuator assembly, the inner stopper and the auxiliary inner stopper. FIG. 15 is a diagram showing the relationship between the behavior displacement of the actuator assembly and the time at the time of the collision with the outer stopper. FIG. 16A is a plan view schematically showing the behavior displacement of the actuator assembly at the time of the collision with the inner stopper and the auxiliary stopper. FIG. 16B is a plan view schematically showing the behavior displacement of the distal end portion of the actuator assembly at the time of the collision with the inner stopper and the auxiliary stopper. FIG. 17 is a plan view showing an actuator assembly and a housing in a state where the actuator assembly collides with an outer stopper in an HDD according to a second embodiment. FIG. 18 is a perspective view showing the actuator assembly, the outer stopper and an auxiliary stopper according to the second embodiment. FIG. 19 is a cross-sectional view of the auxiliary stopper according to a modified example. FIG. 20 is a plan view showing an actuator assembly and a housing in a state where the actuator assembly collides with an outer stopper in an HDD according to a third embodiment. FIG. 21 is a plan view showing the actuator assembly and the housing in a state where the actuator assembly collides wit