Magnetic disk device

Abstract

To provide a magnetic device capable of reducing the amount of particles adhering to a disk while suppressing force and vibration received by arms due to air flow.SOLUTION: A magnetic disk device of the embodiment includes a disk, a shroud, and a guide vane. The disk is rotatable in a rotational direction. The shroud surrounds at least a portion of the disk along the outer edge of the disk with a gap between the disk and the outer edge. The guide vane is connected to the shroud downstream of the air flow generated in the rotational direction of the disk and has a structure in which the air flow between the guide vane and the disk is reduced.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present embodiment relates to a magnetic disk device. [Background technology]

[0002] In a magnetic disk device, if dust or other particles adhere to the disk surface rotating at high speed, the disk surface may be damaged or errors may occur when reading or writing data. Therefore, there is a demand for a magnetic disk that can reduce the amount of particles that adhere to the disk. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-10844 A [Patent Document 2] International Publication No. 2012 / 169048 [Patent Document 3] JP 2007-323788 A [Patent Document 4] JP 2010-135002 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a magnetic disk capable of reducing the amount of particles adhering to the disk. [Means for solving the problem]

[0005] A magnetic disk device according to an embodiment includes a disk, a shroud, and a guide vane. The disk is rotatable in a rotation direction. The shroud surrounds at least a portion of the disk along an outer edge of the disk with a gap therebetween. The guide vane is connected to the shroud downstream of an airflow generated in the rotation direction of the disk, and includes a structure for decelerating the airflow between the guide vane and the disk. [Brief description of the drawings]

[0006] [Figure 1] 1 is a schematic diagram illustrating an example of a magnetic disk device according to a first embodiment. [Diagram 2] 2 is a cross-sectional view taken along line XY in FIG. 1. [Diagram 3] FIG. 2 is a schematic diagram of an example of a magnetic disk device when the disk is stopped. [Figure 4] 2 is an enlarged view of the vicinity of a guide vane in the magnetic disk drive according to the first embodiment. FIG. [Diagram 5] FIG. 2 is a schematic diagram in which the flow direction is indicated in an enlarged view of the vicinity of the device side region in the first embodiment. [Figure 6] FIG. 11 is a schematic diagram in which the flow direction is indicated in an enlarged view of the vicinity of the device side region in the second embodiment. [Figure 7] 1 is a graph comparing the amount of particles attached to a disk surface. [Figure 8] 13 is an example of an enlarged view of a guide vane in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Exemplary embodiments of the present invention are disclosed below. The technical features including the configurations and controls of the embodiments and modified examples shown below, as well as the actions, results, and effects brought about by the configurations and controls, are merely examples. In addition, the multiple embodiments exemplified below include similar components. Hereinafter, similar components are given common reference numerals, and duplicated explanations are omitted.

[0008] In this specification, the direction in which multiple disks 11 are stacked is referred to as the height direction, and the direction toward the front of the paper in FIG. 1 is referred to as the upward direction, and the direction toward the back of the paper is referred to as the downward direction.

[0009] (First embodiment) Fig. 1 is an example of a schematic diagram of the inside of a magnetic disk device in this embodiment. The magnetic disk device 1 includes a plurality of disks 11, a shroud 10, a magnetic head 13, an arm 14, a guide vane 15, devices such as an actuator, and a casing 21. The inside of the casing 21 is divided into a disk side area 2 in which the disks 11, a rotating shaft 12, etc. are accommodated, and a device side area 3 in which devices such as the magnetic head 13, the arm 14, and the actuator are accommodated. Fig. 1 illustrates a state in which the disk 11 rotates counterclockwise around the rotating shaft 12, and the magnetic head 13 is positioned on the surface of the disk 11 to read and write data.

[0010] The casing 21 is filled with a medium gas such as air or helium, and the casing 21 is capable of sealing the medium gas.

[0011] A shroud 10 and guide vanes 15 are provided within the casing 21 to surround at least a portion of the disk 11 and to run along the outer edge of the disk 11 with a gap between them. In the region where the shroud 10 runs along the disk 11, the gap between the shroud 10 and the disk 11 is preferably 0.1 mm or more and 1.0 mm or less.

[0012] The disks 11 are disc-shaped recording media, and multiple disks 11 are stacked. The number of disks 11 can be changed depending on the specifications. The disks 11 may have a single-sided or double-sided magnetic layer, but in this embodiment, the disks 11 are described as being double-sided. The multiple disks 11 are rotatably mounted in the direction of rotation by a rotating shaft, and are stacked at predetermined intervals in the direction of the rotating shaft. In this specification, the main surface of the disk 11 is referred to as the "disk surface," and the disk surface may be described as including the front and back surfaces of the disks 11.

[0013] The rotating shaft 12 is a rotating shaft that rotates the disk 11. The rotating shaft 12 is connected to a drive motor (not shown), and rotates the disk 11, which is fixed to the rotating shaft 12 and arranged so as to be rotatably driven, about the rotating shaft 12 as a central axis. The rotation speed of the disk 11 caused by driving the rotating shaft 12 is generally several thousand rpm to several tens of thousands rpm, but the rotation speed of the disk 11 in this embodiment is not limited to this range. In this embodiment, the description will be given assuming that the rotation direction of the disk 11 is counterclockwise in FIG. 1.

[0014] The magnetic head 13 reads data recorded on the disk 11 and writes data to the disk 11. The magnetic head 13 is provided at the tip of the arm 14. FIG. 2 is a cross-sectional view along X-Y in FIG. 1. The magnetic heads 13 and the disks 11 are arranged alternately. The magnetic head 13 located at the top of the disk 11 can read and write (hereinafter referred to as read and write) the top surface (front surface) of the disk 11, the magnetic head 13 located between the disks 11 can read and write the bottom surface (back surface) of the disk 11 located above it and the front surface of the disk 11 located below it, and the magnetic head 13 located below the disk 11 can read and write the back surface of the disk 11 located above it. FIG. 3 is an example of a schematic diagram of a magnetic disk device when the disk is stopped. When the disk 11 stops rotating, each magnetic head 13 and arm 14 are stopped in a state retracted from the disk 11 as shown in FIG. 3. When the rotating shaft 12 is rotated and the disks 11 are rotated, the centrifugal force and surface viscosity generate an air current in the direction of rotation of the disks 11, causing each magnetic head 13 to float a predetermined amount (for example, about 10 nm) above the surface of the disks 11, and the position of the arm 6 is controlled by an actuator, thereby reading and writing data from and to the magnetic layer of the disk 11 in the portion facing the magnetic head 13. The disk 11 that the magnetic head 13 faces corresponds to the disk 11 directly above the magnetic head 13 and the disk 11 directly below the magnetic head 13. In other words, the magnetic head 13 reads and writes information from and to the opposing disk 11.

[0015] The arm 14 is a member that supports the magnetic head 13. The magnetic head 13 provided at the tip of the arm 14 is disposed so as to be able to enter into the gap between the disks 11 in the stacking direction.

[0016] The actuator drives and controls the arm 14, and controls the position of the magnetic head 13 relative to the disk 11. The actuator is included in the equipment A in Fig. 1. Examples of the actuator include a voice coil motor and a stepping motor, but the actuator in this embodiment is not limited to these.

[0017] A guide vane 15 is provided between the disk side region 2 and the equipment side region 3. The guide vane 15 is connected to the shroud 10 downstream of the airflow generated in the rotation direction of the disk 11. That is, one end of the guide vane 15 is connected to the downstream end of the flow near the disk surface of the disk 11 in the shroud 10. Here, with respect to the flow flowing near the disk surface of the disk 11 as the disk 11 rotates, the vicinity of the flow flowing from the equipment side region 3 to the disk side region 2 is defined as the "upstream of the flow," and the vicinity of the flow flowing from the disk side region 2 to the equipment side region 3 is defined as the "downstream of the flow." In addition, the ends of the shroud 10 refer to both ends of the shroud 10 along the disk 11, and the ends of the shroud 10 exist at two locations, the upstream side and the downstream side of the flow near the disk surface. In addition, "one end of the guide vane 15 is connected to the shroud 10" means that at least a part of the guide vane 15 is in contact with the shroud 10 and has a continuous configuration, and other parts may be included between the guide vane 15 and the shroud 10. For example, even if a support member for supporting the guide vane 15 is provided between the guide vane 15 and the shroud 10, the configuration from the shroud 10 to the guide vane 15 is an integrated one, and it is a series of configurations that can guide the flow 102 and the flow 103. The guide vane 15 and the shroud 10 may be integrated with the same material, or may contain different materials. In addition, the other end of the guide vane 15 is located downstream of the flow near the disk 11 from the one end connected to the shroud 10. The guide vane 15 is arranged in a manner that is approximately along the disk 11. Here, the expression "approximately along" is used because the distance between the guide vane 15 and the disk 11 is not completely constant and varies depending on the position. Figure 4 is an enlarged view of Figure 1 near guide vane 15. Guide vane 15 includes guide vane connection portion 15a, which is the portion connected to the shroud, guide vane tip portion 15c, which is the tip portion on the downstream side of the flow near disk 11, and guide vane center portion 15b, which is the intermediate portion between guide vane connection portion 15a and guide vane tip portion 15c. A region 16 is provided between guide vane 15 and disk 11.Region 16 is composed of, depending on the position, region 16a of the disk 11 and the guide vane connection part 15a, region 16b of the disk 11 and the guide vane central part 15b, and region 16c of the disk 11 and the guide vane connection part 15c.

[0018] In region 16, the shortest distance from a point on the surface of the guide vane 15 facing the disk 11 to the disk 11 is defined as the distance d16 between the guide vane 15 and the disk 11. Also, the shortest distance from a point on the surface of the shroud 10 facing the disk 11 to the disk 11 is defined as the distance between the shroud 10 and the disk 11. At this time, d16 is greater than the distance between the shroud 10 and the disk 11. Also, d16 increases as the distance from the guide vane connection part 15a becomes farther. That is, if the distance between the guide vane 15 and the disk 11 in region 16a is d16a, the distance between the guide vane 15 and the disk 11 in region 16b is d16b, and the distance between the guide vane 15 and the disk 11 in region 16c is d16c, the guide vane 15 is provided so as to satisfy the relationship d16a < d16b < d16c. Hereinafter, this structure may be described as a "structure in which d16 gradually increases". In the present embodiment, the maximum value of d16c is preferably 1.0 mm or less, and more preferably 0.8 mm or less.

[0019] The airflow generated inside the magnetic disk will be described below. FIG. 5 is a schematic diagram of the inside of the magnetic disk device in FIG. 1 with arrows indicating the flow of the airflow added. The flows 101a and 101b are induced by the disk 11 when the disk 11 rotates, and are flows near the disk surface. In this specification, the flows 101a and 101b may be collectively referred to as the flow 101. The flow 102 is induced by the rotation of the disk 11, and passes through the gap between the disk 11 and the shroud 10. The flow 103 is a flow that passes through the region 16. A part of the flow 103 flows in a direction from the disk side region 2 toward the device side region 3, and becomes the flow 104a and the flow 104b. A part of the flow 104a flows in the device side region 3 so as to surround the device A including the actuator. This flow is referred to as the flows 105a to 105e. On the other hand, a part of the flow 104b flows in the device side region 3 so as to surround the device B different from the device A. These flows are referred to as flows 106a-c. Flow 107 passes through the device-side area 3 and flows into the disk-side area 2 again. Flows 108a-b are flows of flow 103a that flow toward the disk-side area 2. In this specification, with respect to the flows that flow near the disk surface of disk 11 as disk 11 rotates, the vicinity of flow 107 that flows from the device-side area 3 into the disk-side area 2 may be described as the "upstream flow", and the vicinity of flow 103 that flows from the disk-side area 2 into the device-side area 3 may be described as the "downstream flow".

[0020] In this specification, flows 104a-b may be collectively referred to as flow 104, flows 105a-e may be collectively referred to as flow 105, flows 106a-c may be collectively referred to as flow 106, and flows 108a-b may be collectively referred to as flow 108.

[0021] Conventionally, there has been an issue that the flow that has passed through the device-side region 3 flows back into the disk-side region 2, carrying with it particles with a particle size of tens to hundreds of nm that are present in the device-side region 3. If the particles carried to the disk-side region 2 in this way adhere to the surface of the disk 11, they can cause various problems, such as damaging the disk surface or causing errors in reading and writing data.

[0022] Therefore, according to this embodiment, the guide vane 15 reduces the flow flowing from the disk side region 2 to the equipment side 3, thereby reducing the flow rate of the flow 107 that passes through the equipment side region 3 and flows back into the disk side region 2.

[0023] Furthermore, in the guide vane 15 of this embodiment, the distance d16 between the guide vane 15 and the disk 11 gradually increases from the root to the tip of the guide vane 15. In this embodiment, the structure in which the guide vane 15 decelerates the airflow is a structure in which d16 of the guide vane 15 gradually increases. In this structure, when the continuity equation is applied to the airflow (flow 103) between the guide vane 15 and the disk 11, the flow 103 decelerates from upstream to downstream. However, the structure in which the guide vane 15 decelerates the airflow is not limited to this structure, and any structure capable of decelerating the flow 103 may be used.

[0024] As the flow 103 decelerates, the flow 104 also decelerates. As the flow 104a decelerates, the flow 105 decelerates, and as the flow 104b decelerates, the flow 106 also decelerates. As the flows 105 and 106 decelerate, the amount of particles carried by the flows while passing through the device side region 3 can be reduced.

[0025] Furthermore, as the flow 103 decelerates, the flow 108 also decelerates, and the turbulence of the airflow near the boundary between the disk side region 2 and the device side region 3 is also reduced. This makes it possible to prevent the flow 108 from entraining particles near the outer edge of the disk side region 2. Furthermore, the pressure in the region of the disk side region 2 close to the device side region 3 increases, and the pressure difference between the disk side region 2 and the device side region 3 is alleviated. Therefore, it is possible to reduce the flow 109 from the device side 3 toward the disk side region 2, which is induced by this pressure difference, and it becomes possible to prevent a flow including particles from flowing into the disk side region 2.

[0026] Moreover, the reduction in the speed and turbulence of the flows 104a and 108a not only reduces the amount of particles carried to the disk-side area 2, but also suppresses the vibration of the arm caused by the airflow. This reduces the vibration of the arm 14 supporting the magnetic head 13, making it possible to improve the positioning accuracy of the magnetic head 13 by the actuator, or to facilitate positioning.

[0027] In this way, by providing guide vanes of a specific shape in the magnetic disk device of this embodiment, it is possible to reduce the number of particles transported from the device side to the disk side, and further to suppress vibrations of the arm caused by airflow.

[0028] The casing 21 and the shroud 10 may be integral with each other, or may be manufactured integrally in the manufacturing process. Similarly, the guide vane 15 and the shroud 10 may be integral with each other, or may be manufactured integrally in the manufacturing process.

[0029] Second embodiment A second embodiment, which is a partial modification of the first embodiment, will be described with reference to Fig. 5. In the description of this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0030] FIG. 6 is an example of an enlarged view of the magnetic disk device in the present embodiment. In the present embodiment, the guide vane 15 has an air flow guiding portion 15d on the downstream side of the flow 103 further downstream of the tip portion 15c of the guide vane. In the present embodiment, the region of the downstream side of the flow 103 in the guide vane 15 excluding the air flow guiding portion 15d will be described as the tip portion 15c of the guide vane. Also in the present embodiment, similar to the first embodiment, the relationship of d16a < d16b < d15c holds. However, since the air flow guiding portion 15d faces the disk 11, if the distance between the air flow guiding portion 15d and the disk 11 is d16d, d16d is smaller than the maximum value of d16c. Also, d16d is preferably 50% or more of the maximum value of d16c, and more preferably 80% or more of the maximum value of d16c. Note that d16d is larger than d16a.

[0031] The air flow generated inside the magnetic disk in the present embodiment will be described below. The flows 108c, 108d, and 108e are the flows that flow toward the disk side region 2 in the flow 103.

[0032] The distance d16 between the guide vane 15 and the disk 11 in the present embodiment is such that d16a < d16b, similar to the first embodiment, so the flow 103 decelerates. Note that since d16d is designed to be at least 50% or more of the maximum value of d16c and preferably designed to be 80% or more of the maximum value of d16c, it has a structure that prevents excessive re - acceleration of the flow 103. The guide vane 15 can guide the direction of a part of the flow that has flowed out of the region 16 while suppressing the re - acceleration of the flow 103. Therefore, the presence of the air flow guiding portion 15d does not prevent the effect of the deceleration of the flow 103 by the guide vane 15.

[0033] According to the present embodiment, in addition to the deceleration of the flow 103 due to d16a < d16b, since the airflow guiding portion 15d provided in front of the tip of the guide vane tip 15c faces the disk side region 2, a part of the flow 103 is guided as a flow 108c toward the more central portion of the disk side region 2, and the flow 103 is divided into the flow 108c, the flow 108d at the outer edge of the disk, and the flow 108e. As a result, the flow rates of the flows 108d and 108e are smaller than those of the flows 108a and 108b, respectively. Thereby, it is possible to further prevent the entrainment of particles near the outer edge of the disk side region 2 by the flows 108d and 108e. Further, since the flow rates of the flows 104a and 104b also become smaller, the flow 105 is decelerated when the flow 104a is decelerated, and the flow 106 is also decelerated when the flow 104b is decelerated. By decelerating the flows 105 and 106, it is possible to reduce the amount of particles carried while the flow passes through the device side region 3. Furthermore, the pressure in the region of the disk side region 2 close to the device side region 3 increases, and the pressure difference between the disk side region 2 and the device side region 3 is alleviated. Therefore, it is possible to reduce the flow 109 from the device side 3 toward the disk side region 2 induced by this pressure difference, and it becomes possible to further prevent the flow containing particles from flowing into the disk side region 2.

[0034] FIG. 7 shows the amount of particles adhering to the surface of the disk 11 when the disk 11 is rotated for a certain period of time. The measurement results are based on the amount of particle adhesion when a magnetic disk device without a guide vane is operated for the same period of time. The measurement results for the magnetic disk device without a guide vane are shown on the horizontal axis of the graph in FIG. 7 as "without guide vane" and the measurement results for the magnetic disk device equipped with the guide vane 15 according to this embodiment are shown as "embodiment 2". From this result, the amount of particles adhering to the disk 11 in the magnetic disk device equipped with the guide vane 15 according to this embodiment was less than half the amount of particles adhering to the disk 11 in the magnetic disk device without a guide vane. This is because the guide vane 15 reduces the flow rate of the flow flowing from the disk side region 2 to the device side region 3, the flow 103 is decelerated because d16 is larger than the distance between the shroud 10 and the disk 11, the flow 103 is further decelerated because d16 is gradually increased in the region 16, and further, the airflow guiding portion 15d guides a part of the flow 103 toward the center of the disk side region 2. Therefore, it can be seen that the guide vane 15 according to this embodiment can reduce the number of particles carried from the device side area 3 to the disk side area 2.

[0035] Moreover, the reduction in the speed and turbulence of the flows 104a and 108d not only reduces the amount of particles carried to the disk-side area 2, but also suppresses the vibration of the arm caused by the airflow. This reduces the vibration of the arm 14 supporting the magnetic head 13, making it possible to further improve the positioning accuracy of the magnetic head 13 by the actuator, or to make positioning even easier.

[0036] In this way, in the magnetic disk device of this embodiment, by installing guide vanes of a predetermined shape, it is possible to reduce particles carried from the device side area 3 to the disk side area 2. Furthermore, it is possible to further suppress vibration of the arm 14 caused by airflow.

[0037] (Third embodiment) The third embodiment will be described below. In the description of the present embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0038] In this embodiment, the guide vane 15 has a rough surface having fine irregularities, grooves, or protrusions on the surface. In this embodiment, the structure in which the guide vane 15 decelerates the airflow is a rough surface having fine irregularities, grooves, or protrusions on the surface of the guide vane 15. However, the structure in which the guide vane 15 decelerates the airflow is not limited to this structure, and may be any structure capable of decelerating the flow 103. The fine irregularities, grooves, or protrusions on the surface of the guide vane 15 increase the friction that the flow 103 receives when passing through the region 16, so that the flow 103 is decelerated from upstream to downstream. FIG. 8 is an example of a guide vane 15 having grooves on its surface. In the figure, the surface of the guide vane 15 facing the disk 11 has grooves. The grooves in the figure are arranged approximately parallel to the traveling direction of the flow 103, but the shape and intervals of the grooves provided in the guide vane 15 are not particularly limited.

[0039] In this way, by effectively decelerating the flow 103, it is possible to reduce the number of particles carried from the device side area 3 to the disk side area 2. Furthermore, it is possible to further suppress vibration of the arm 14 caused by the airflow.

[0040] However, in this embodiment, the fine irregularities, grooves, or protrusions are very small compared to d16, and the effect on the size of d16 can be almost negligible.

[0041] The configuration according to this embodiment may be used in combination with the first and second embodiments.

[0042] In this specification, several embodiments according to the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. In addition, the configurations according to the first to third embodiments exemplified in this specification may be used in any combination. The embodiments of the present invention can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the scope of the invention and its equivalents described in the claims.

[0043] [Appendix 1] A disk rotatable in a rotational direction; a shroud that surrounds at least a portion of the disk along an outer edge of the disk with a gap therebetween; A guide vane connected to the shroud downstream of the airflow generated in the rotation direction; Equipped with The guide vane includes a structure for slowing down the airflow between the guide vane and the disk. Magnetic disk device.

[0044] [Claim 2] a distance between the guide vane and the disk is greater than a distance between the shroud and the disk; 2. A magnetic disk device as described in appendix 1.

[0045] [Appendix 3] The guide vane is A guide vane connection portion connected to the shroud; A guide vane tip portion which is a tip portion on the downstream side of the flow; a guide vane center portion between the guide vane connection portion and the guide vane tip portion; Including, The distance between the guide vane central portion and the disk is greater than the distance between the guide vane connection portion and the disk. 3. A magnetic disk device according to claim 1 or 2.

[0046] [Appendix 4] The guide vane is A guide vane connection portion connected to the shroud; A guide vane tip portion which is a tip portion on the downstream side of the flow; a guide vane center portion between the guide vane connection portion and the guide vane tip portion; Including, a distance between the guide vane center portion and the disk is greater than a distance between the guide vane connection portion and the disk, and a distance between the guide vane tip portion and the disk is greater than a distance between the guide vane center portion and the disk; 4. A magnetic disk device according to claim 1.

[0047] [Appendix 5] The guide vane is A guide vane connection portion connected to the shroud; A guide vane tip portion which is a tip portion on the downstream side of the flow; a guide vane center portion located between the guide vane connection portion and the guide vane tip portion; An airflow guide portion located downstream of the guide vane tip portion; Including, a distance between the guide vane central portion and the disk is greater than a distance between the guide vane connection portion and the disk, and a distance between the airflow guiding portion and the disk is smaller than a maximum value of a distance between the guide vane tip portion and the disk; 5. A magnetic disk device according to claim 1.

[0048] [Appendix 6] The guide vane has a surface having irregularities, grooves, or protrusions. 6. A magnetic disk device according to any one of claims 1 to 5.

[0049] [Appendix 7] A disk that is rotatably driven by a rotating shaft; a shroud that surrounds a portion of the disk along an outer edge of the disk with a gap therebetween; A guide vane having one end connected to an end of the shroud; Equipped with a distance between the guide vane and the disk is greater than a distance between the shroud and the disk; Magnetic disk device.

[0050] [Appendix 8] a magnetic head for reading data recorded on the disk and for writing data to the disk; an arm having the magnetic head at its tip; an actuator for controlling the position of the head; Equipped with the casing contains therein the rotating shaft, the disk, the shroud, the guide vane, the magnetic head, the arm, and the actuator; 8. A magnetic disk device according to any one of claims 1 to 7. [Explanation of symbols]

[0051] 1: Magnetic disk device 2: Disk side area 3: Equipment side area 10: Shroud 11: Disk 12: Rotation axis 13: Magnetic head 14: Arm 15: Guide vane 15a: Guide vane connection 15b: Center of guide vane 15c, 15c': Guide vane tip 15d: Air flow guidance section 16: Area 16a: Area (between the disc and the guide vane connection) 16b: Area (between the disk and the center of the guide vane) 16c: Area (between the disk and the tip of the guide vane) 16d: Area (between the disk and the airflow guide) 21: Casing 101, 101a-c: Flow on the disk surface 102: Flow along the gap between the guide vane and the disk 103: Flow between the shroud and the disk 104, 104a-b: Flow from the disk side area to the device side area 105, 105a-e, 106, 106a-c: Flow on the equipment side 107: Flow from device side area to disk side area 108, 108a-e: Flow toward the disk side region 2 109: Flow due to pressure difference

Claims

1. A disk rotatable in a rotational direction; a shroud that surrounds at least a portion of the disk along an outer edge of the disk with a gap therebetween; A guide vane connected to the shroud downstream of the airflow generated in the rotation direction; Equipped with The guide vane includes a structure for slowing down the airflow between the guide vane and the disk. Magnetic disk device.

2. a distance between the guide vane and the disk is greater than a distance between the shroud and the disk; 2. The magnetic disk drive according to claim 1.

3. The guide vane is A guide vane connection portion connected to the shroud; A guide vane tip portion which is a tip portion on the downstream side of the flow; a guide vane center portion between the guide vane connection portion and the guide vane tip portion; Including, The distance between the guide vane central portion and the disk is greater than the distance between the guide vane connection portion and the disk.

2. The magnetic disk drive according to claim 1.

4. The guide vane is A guide vane connection portion connected to the shroud; A guide vane tip portion which is a tip portion on the downstream side of the flow; a guide vane center portion between the guide vane connection portion and the guide vane tip portion; Including, a distance between the guide vane center portion and the disk is greater than a distance between the guide vane connection portion and the disk, and a distance between the guide vane tip portion and the disk is greater than a distance between the guide vane center portion and the disk; 2. The magnetic disk drive according to claim 1.

5. The guide vane is A guide vane connection portion connected to the shroud; A guide vane tip portion which is a tip portion on the downstream side of the flow; a guide vane center portion located between the guide vane connection portion and the guide vane tip portion; An airflow guide portion located downstream of the guide vane tip portion; Including, a distance between the guide vane central portion and the disk is greater than a distance between the guide vane connection portion and the disk, and a distance between the airflow guiding portion and the disk is smaller than a maximum value of a distance between the guide vane tip portion and the disk; 2. The magnetic disk drive according to claim 1.

6. The guide vane has a surface having irregularities, grooves, or protrusions.

2. The magnetic disk drive according to claim 1.

7. A disk that is rotatably driven by a rotating shaft; a shroud that surrounds a portion of the disk along an outer edge of the disk with a gap therebetween; A guide vane having one end connected to an end of the shroud; Equipped with a distance between the guide vane and the disk is greater than a distance between the shroud and the disk; Magnetic disk device.

8. a magnetic head for reading data recorded on the disk and for writing data to the disk; an arm having the magnetic head at its tip; an actuator for controlling the position of the head; Equipped with the casing contains therein the rotating shaft, the disk, the shroud, the guide vane, the magnetic head, the arm, and the actuator; 8. The magnetic disk drive according to claim 1.

Images