JP2004234784A - Magnetic disk unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a magnetic disk unit in which wind disturbance can be reduced and operation speed can be increased in the magnetic disk unit provided with a magnetic disk of a disk type being rotated, a magnetic head performing recording/reproducing of data for the magnetic disk, and a head arm rotatably supported by a shaft and provided with a head arm in which a magnetic head is mounted at a tip part so that the magnetic head can be shifted in the direction of crossing a track of the disk. <P>SOLUTION: A spoiler 30 is arranged at a position of a rotation direction upstream side of magnetic disks 2, 3 rather than a head arm 7 approaching to the magnetic disks 2, 3. Further, the device is a plate type shroud 31, 32 in which circular arc type wall planes 31a, 32a opposing to outer periphery planes of the magnetic disks 2, 3 are formed over a range from a position of this spoiler 30 to rotation direction upstream side end parts 4c of the magnetic disks 2, 3 in a circular arc type wall plane 4a of a case 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk-shaped magnetic disk that is driven to rotate, a magnetic head that records / reproduces data on and from the magnetic disk, and a shaft that is rotatably supported by a shaft and has a track at the end. The present invention relates to a magnetic disk drive having a head arm on which a magnetic head is mounted so that the magnetic head can be moved in a transverse direction.
[0002]
[Prior art]
Magnetic disk drives are not only increasing in capacity but also in speed. When the magnetic disk is rotated at a high speed in order to satisfy the demand for higher speed, a large air flow is generated as the magnetic disk rotates at a high speed. If this air flow is disturbed, it acts as a disturbance on the magnetic head, head arm and magnetic disk (this disturbance is called wind disturbance), and the magnetic head, head arm and magnetic disk vibrate, and the magnetic head Will decrease the positioning accuracy.
[0003]
The magnetic disk device is provided with a shroud (outer wall) surrounding the magnetic disk, and a smaller opening angle of the insertion portion of the head arm (carriage arm) (for example, see Patent Document 1), or a comb tooth into which the head arm enters. There is a shroud provided from near the head arm to upstream of the head arm in the disk rotation direction (for example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-11-232866 (FIG. 1)
[Patent Document 2]
JP 2000-228079 A (FIG. 1)
[0005]
[Problems to be solved by the invention]
In the magnetic disk device described in Patent Document 1, although the opening angle of the insertion portion of the head arm is made small, there is still a wide opening in the rotation center axis direction (height direction) of the head arm. The air flow is disturbed in this part, and the magnetic head and the head arm are subjected to a large wind disturbance.
[0006]
Similarly, also in the magnetic disk device described in Patent Document 2, a large opening exists from the vicinity of the head arm to the downstream side of the head arm in the disk rotation direction, and the air flow is disturbed at this portion, and the influence of wind disturbance is reduced. There is a problem that it extends to a magnetic head and a head arm.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to realize a magnetic disk drive capable of reducing wind disturbance and responding to high speed.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 which solves the above problem will be described with reference to FIG. 1 showing an embodiment of the present invention. A magnetic head 10 for recording / reproducing data with respect to the magnetic disk 3 and a magnetic head 10 rotatably supported by a shaft 8 and having a magnetic head 10 at a tip end thereof so as to be able to move in a direction crossing a track of the disk. A mounted head arm 7, an actuator 11 for rotating the head arm 7, and an arc-shaped wall surface 4a facing the outer peripheral surfaces of the magnetic disks 2 and 3 are formed. As a basic configuration, a housing 1 having a space 4b for accommodating the head arm 7, the shaft 8, and the actuator 11 is formed at a position facing the arc-shaped wall surface 4a.
[0009]
Further, in the present invention, spoilers 30, 4p, and 5p are arranged closer to the recording surfaces of the magnetic disks 2, 3 at a position upstream of the head arm 7 in the rotation direction of the magnetic disks 2, 3. The spoilers 30, 4p, and 5p direct the airflow generated around the recording surface with the rotation of the magnetic disks 2 and 3 toward the rotation center of the magnetic disks 2 and 3. Further, an arc-shaped wall surface 31a facing the outer peripheral surface of the magnetic disks 2 and 3 extends from a position of the spoiler 30 to an upstream end 4c in the rotation direction of the magnetic disks 2 and 3 on the arc-shaped wall surface 4a of the housing 1. , 32a are provided.
[0010]
In the present invention, the spoiler 30 is provided on the upstream side of the head arm 7 in the rotation direction of the magnetic disks 2 and 3, and the absolute value of the wind pressure applied to the magnetic head 10 and the head arm 7 is also small. Moreover, the arc-shaped wall surfaces 31a, 32a of the plate-shaped shrouds 31, 32 extend from the position of the spoiler 30 to the rotation-direction upstream end 4c of the magnetic disks 2, 3 on the arc-shaped wall surface 4a of the housing 1. Since they are provided continuously so as to face the outer peripheral surfaces of the magnetic disks 2 and 3, the airflow flowing around the head arm 7 is not disturbed, and the wind disturbance is reduced. Therefore, the wind disturbance does not act on the magnetic head 10 or the head arm 7 as the positioning accuracy of the magnetic head 10 is reduced.
[0011]
According to a second aspect of the present invention, the magnetic disks 2 and 3 according to the first aspect of the present invention include a plurality of magnetic disks 2 and 3 stacked via a spacing ring 20. In addition, a plate-shaped spoiler 30 is inserted and arranged, and the spoiler 30 is fixed to the housing 1 so as to be sandwiched between the plate-shaped shrouds 31 and 32.
[0012]
In the present invention, the spoiler 30 and the shrouds 31, 32 are manufactured by processing the plate-like member, and these are laminated and fixed to the housing 1. Therefore, the processing and mounting are facilitated, and the cost can be reduced. .
[0013]
According to a third aspect of the present invention, in the invention according to the second aspect, the communication passage 35 for bypassing a part of the air dammed by the spoiler 30 and flowing to the downstream side of the head arm 7 is provided. And the downstream side wall surface of the opening on the inlet side of the communication passage 35 is formed by the laminated portion side surface 30c of the plate-shaped shrouds 31, 32 and the spoiler 30. Is what you do.
[0014]
In the case where the communication passage 35 is provided, it is necessary to form the downstream side wall surface of the entrance side opening portion with a gentle curved surface. In the present invention, however, the lamination of the plate-shaped shrouds 31 and 32 and the spoiler 30 which is easy to process. Since the downstream side wall surface of the entrance side opening is formed by the part side surface 30c, a wall surface having a good shape can be formed at low cost.
[0015]
Embodiment
FIG. 1 is a partially broken plan view (with a cover removed) showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a central portion of a magnetic disk. The basic configuration of the magnetic disk device of this embodiment is the same as the basic configuration of a conventional magnetic disk device. In this embodiment, two magnetic disks are used, and both surfaces of each magnetic disk are used as recording surfaces.
[0016]
In FIGS. 1 and 2, two disk-shaped magnetic disks 2 and 3 are rotatably provided at the center of a housing (disk enclosure) 1 that seals the inside of the apparatus. The housing 1 includes a box-shaped base 4 having a recess for accommodating the magnetic disks 2, 3 and the like formed on the upper surface side, and a cover 5 (see FIG. 3) for covering an open surface of the base 4. An arc-shaped wall surface 4a is formed on the base 4 so as to face the outer peripheral surfaces of the magnetic disks 2 and 3, and a space 4b is formed at a position facing the arc-shaped wall surface with the magnetic disks 2 and 3 interposed therebetween. I have.
[0017]
In the vicinity of the outer peripheral portions of the magnetic disks 2 and 3 in the space 4b, a so-called rotationally balanced head arm (carriage arm) 7 whose center of gravity coincides with the center of rotation is provided with a shaft protruding from the base 4. 8 is provided so as to be rotatable. A suspension (not shown) is provided on the tip end side of the head arm 7, and a magnetic head (magnetic head slider) 10 for recording and reproducing data on tracks on the magnetic disks 2 and 3 is attached to the suspension.
[0018]
In this embodiment, two magnetic disks 2 and 3 are used, and both surfaces of each magnetic disk 2 and 3 are recording surfaces. Therefore, the distal end of the head arm 7 is branched into four arms, and each arm is divided into four arms. A magnetic head 10 is provided in the section. The magnetic head 10 is a composite head composed of a read head unit and a write head unit. When the magnetic disks 2 and 3 rotate, the magnetic head 10 floats from the recording surface and records data on the magnetic disks 2 and 3. It is for regenerating. FIG. 1 shows a magnetic head 10 that accesses the upper recording surface of the magnetic disk 3.
[0019]
An actuator (voice coil motor) 11 that rotationally drives the head arm 7 is provided on the base end side of the head arm 7. The configuration of the actuator 11 is such that a magnetic circuit having a magnetic gap is fixed on the housing 1 side, and a voice coil (moving coil) is fixed to the head arm 7. When a drive current is applied to the voice coil in the actuator 11, a thrust is generated in the voice coil portion in the magnetic gap, the head arm 7 rotates, and the magnetic head 10 moves in the track width direction of the magnetic disks 2, 3. Will be.
[0020]
The spindle motor 13 for rotatingly driving the magnetic disks 2 and 3 has a configuration as shown in FIG. In FIG. 2, a stator coil 15 is mounted on an outer peripheral portion of a shaft 14 fixed to the base 4, and a hub 18 is rotatably mounted via bearings 16 and 17. A collar portion is formed on the outer peripheral portion of the hub 18, and the magnetic disks 2 and 3 are stacked on the collar portion via a disc-shaped spacing ring 20. A disk clamp 21 is fixed to the hub 18 using bolts 22 in order to maintain the stacked state of the magnetic disks 2 and 3.
[0021]
A magnet 23 and a yoke (not shown) are attached to the inner peripheral portion of the hub 18. By driving (exciting) the stator coil 15, the hub 18 is rotated, and the magnetic disks 2 and 3 are rotated counterclockwise in FIG. It rotates in the direction (arrow F direction).
[0022]
A plate-shaped spoiler 30 is disposed at a position upstream of the head arm 7 in the rotation direction of the magnetic disks 2 and 3. The thin portion 30a of the spoiler 30 is inserted and arranged in the space between the magnetic disks 2 and 3, and is kept at a distance of 1 mm or less from the lower recording surface of the magnetic disk 2 and the upper recording surface of the magnetic disk 3. I have. The spoiler 30 directs the airflow in the direction of arrow F generated between the magnetic disks 2 and 3 with the rotation of the magnetic disks 2 and 3 toward the rotation center of the magnetic disks 2 and 3. Has a circular arc shape that protrudes toward the rotation center of the magnetic disks 2 and 3 toward the downstream side in the rotation direction of the magnetic disks 2 and 3.
[0023]
On the bottom surface of the base 4, the surface facing the magnetic disk 3 is provided with a spoiler 30 in order to direct the airflow in the direction of arrow F generated on the lower recording surface of the magnetic disk 3 toward the rotation center of the magnetic disks 2 and 3. A step-like projection 4p having a similar planar shape is formed as a spoiler. Similarly, on the lower surface of the cover 5, the surface facing the magnetic disk 2 is attached to the spoiler 30 in order to direct the airflow in the direction of arrow F generated on the upper surface of the magnetic disk 2 toward the rotation center of the magnetic disks 2 and 3. The step-shaped projection 5p having a similar planar shape is formed as a spoiler (hereinafter, the step-shaped projection 4p and the step-shaped projection 5p are referred to as spoilers).
[0024]
Plate-shaped shrouds 31 and 32 are provided from the position of the spoiler 30 to the rotation-direction upstream end 4c of the magnetic disks 2 and 3 on the arc-shaped wall surface 4a of the housing 1 (base 4). The plate-shaped shrouds 31 and 32 have arc-shaped wall surfaces 31a and 32a facing the outer peripheral surfaces of the magnetic disks 2 and 3, respectively. The thickness of the plate-shaped shrouds 31 and 32 is approximately the same as the thickness of the magnetic disks 2 and 3 because the high-speed airflow near the outer periphery of the magnetic disks 2 and 3 may be guided.
[0025]
The spoiler 30 is fixed to the housing 1 (base 4) using bolts or the like (not shown) so as to be sandwiched between the plate-shaped shrouds 31 and 32. The spacing support members 33, 34 have the same thickness as the base (non-thin portion) of the spoiler 30, and come into contact with the middle and downstream ends of the plate-shaped shrouds 31, 32, respectively. This is for keeping the interval constant. The plate-shaped shrouds 31 and 32 are also fixed to the base 4 at the positions of the spacing support members 33 and 34.
[0026]
More specifically, for example, an overlapping portion of the spacing support member 33 and the plate-shaped shrouds 31, 32, an overlapping portion of the spacing support member 34 and the plate-shaped shrouds 31, 32, and further, a spoiler 30 and the plate-shaped shrouds 31, 32. Through-holes are formed in the thickness direction in a total of three overlapping portions of the overlapping portion, and a bolt is passed therethrough and screwed to the base 4. Regarding the spacing support member 33, there is no strength problem even if it is not provided.
[0027]
The spacing support member 34 has an arc surface having the same radius as the arc-shaped wall surface 4a and an arc surface facing the space 4b, and the wall guides the air flow similarly to the plate-shaped shrouds 31, 32. It is also a stationary wall. The remaining side surface of the spacing support member 34 is in contact with the wall surface of the space 4b.
[0028]
The spoiler 30 and the plate-shaped shrouds 31 and 32 are assembled to the base 4 after, for example, attaching the magnetic disks 2 and 3 to the base 4 and then attaching the actuator 11. The spoiler 30, the plate-like shrouds 31, 32, the spacing support members 33, 34, and the actuator 11 are temporarily fixed as one combined body before being assembled to the base 4, and after the combined body is attached to the base 4, May be fixed.
[0029]
In the present embodiment, the communication passage 35 is formed in the space 4b of the housing 1 in order to flow a portion of the air damped by the spoilers 30, 4p, and 5p to the downstream side of the head arm 7. Have been. The inlet-side opening of the communication passage 35 is located on the upstream side of the head arm 7, and has an inner wall surface 4 d (upstream side wall surface) of the base 4 and a side surface (downstream side) of the plate-shaped shrouds 31, 32 and the spoiler 30. Wall). The communication passage 35 is for reducing the pressure difference between the upstream and downstream sides of the spoilers 30, 4p, 5p.
[0030]
If the air flowing through the communication passage 35 is used, the inside of the casing 1 is cooled, and a filter 38 as shown in FIG. 1 is provided in the middle of the communication passage 35 (the space 4b of the base 4), and the air passing therethrough is provided. Dust inside can be removed. The FPC 36 is used for transmitting signals to and from the magnetic head 10, and one end of the FPC 36 is connected to the connector 37.
[0031]
Next, the operation of the above embodiment will be described. When not operating, the magnetic head 10 has landed in an escape zone formed further inside the data zone of the magnetic disks 2 and 3. In the operating state, the magnetic disks 2 and 3 are driven to rotate by the spindle motor 13. Due to the air flow generated by the rotation of the magnetic disks 2 and 3, the magnetic head 10 flies at a minute interval with respect to the magnetic disks 2 and 3. Then, in this state, the actuator 11 is driven, and the magnetic head 10 is moved in a direction crossing the tracks of the magnetic disks 2 and 3. When the magnetic head 10 moves to a desired track, it records and reproduces data on the magnetic disks 2 and 3.
[0032]
Paying attention to the air flow generated with the rotation of the magnetic disks 2 and 3, in the present embodiment, spoilers 30, 4p and 5p are provided upstream of the head arm 7 in the rotation direction of the magnetic disks 2 and 3. The absolute value of the wind pressure applied to the magnetic head 10 and the head arm 7 is also small.
[0033]
Moreover, the arc-shaped wall surfaces 31a, 32a of the plate-shaped shrouds 31, 32 extend from the position of the spoiler 30 to the rotation-direction upstream end 4c of the magnetic disks 2, 3 on the arc-shaped wall surface 4a of the housing 1. Since they are provided continuously so as to face the outer peripheral surfaces of the magnetic disks 2 and 3, the airflow flowing around the head arm 7 is not disturbed, and the wind disturbance is reduced. Therefore, the wind disturbance does not act on the magnetic head 10 or the head arm 7 as the positioning accuracy of the magnetic head 10 is reduced.
[0034]
Further, in the present embodiment, the spoiler 30 manufactures the shrouds 31 and 32 by processing the plate-shaped member, and laminates and fixes the shrouds 31 and 32 to the housing 1. Therefore, the processing and mounting are easy, and the cost is reduced. Can be down.
[0035]
Further, in the case where the communication passage 35 is provided, the downstream side wall surface (the surface to which the air flow is strongly applied) of the inlet side opening portion needs to be formed with a gentle curved surface as shown in FIG. Since the downstream side wall surface of the inlet-side opening is formed by the lamination portion side surface 30c of the plate-shaped shrouds 31, 32 and the spoiler 30, which can be easily processed, a wall surface having a good shape can be formed at low cost.
[0036]
The present invention is not limited to the above embodiment. For example, the number of magnetic disks may be one or three or more. Further, the structures of the spindle motor 13, the actuator 11, the head arm 7, and the like can be replaced with a conventionally known structure. Further, a step-like projection 4p and a step-like projection 5p are integrally provided on the bottom surface of the base 4 and the lower surface of the cover 5, respectively, and these are used as spoilers. You may.
[0037]
Further, the spoiler 30, the plate-like shrouds 31, 32, and the spacing support members 33, 34 can be made of not only metal but also resin. When the plate-shaped shrouds 31 and 32 are made of resin, the spacing support members 33 and 34 may be integrally formed.
[0038]
【The invention's effect】
As described above, in the invention according to claim 1, the spoiler is provided upstream of the head arm in the rotation direction of the magnetic disk, and the absolute value of the wind pressure applied to the magnetic head and the head arm is also small. Moreover, the arc-shaped wall surface of the plate-shaped shroud is continuously formed so as to face the outer peripheral surface of the magnetic disk over the range from the position of the spoiler to the end of the arc-shaped wall surface of the housing on the upstream side in the rotation direction of the magnetic disk. As a result, the airflow flowing around the head arm is not disturbed, and the wind disturbance is reduced. Therefore, according to the present invention, it is possible to realize a magnetic disk device that can reduce wind disturbance and can cope with high speed.
[0039]
Further, according to the second aspect of the present invention, a spoiler and a shroud are manufactured by processing a plate-shaped member, and these are laminated and fixed to a housing, so that processing and mounting are facilitated, and cost is reduced. Can be achieved.
[0040]
According to the third aspect of the present invention, since the downstream side wall surface of the opening on the entrance side of the communication passage is formed by the side surface of the laminated portion of the plate-shaped shroud and the spoiler, the wall surface having a good shape can be formed at low cost. Can be formed.
[Brief description of the drawings]
FIG. 1 is a partially broken plan view showing an embodiment of the present invention.
FIG. 2 is a sectional view of a central portion of a magnetic disk in the embodiment of FIG.
FIG. 3 is a cross-sectional view of a main part taken along the line AA in the embodiment of FIG. 1;
FIG. 4 is a cross-sectional view of a main part taken along line BB in the embodiment of FIG. 1;
FIG. 5 is a cross-sectional view of a main part taken along the line CC in the embodiment of FIG. 1;
FIG. 6 is an exploded perspective view of a main part of the embodiment of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cases 2, 3 Magnetic disk 4 Base 4a Arc-shaped wall surface 4b Space 4c Upstream end 5 in rotation direction Cover 10 Magnetic head 11 Actuator 20 Spacer rings 30, 4p, 5p Spoiler 30c Laminated portion side surfaces 31, 32 Plate shroud 31a , 32a Arc-shaped wall surfaces 33, 34 Interval support member 35 Communication passage

Claims (3)

A disk-shaped magnetic disk that is driven to rotate,
A magnetic head for recording / reproducing data on / from the magnetic disk;
A head arm mounted with the magnetic head so that the magnetic head can be moved in a direction traversing the track of the disk, and rotatably supported by a shaft;
An actuator that rotationally drives the head arm,
An arc-shaped wall surface facing the outer peripheral surface of the magnetic disk is formed, and a space for accommodating the head arm, the shaft and the actuator is provided at a position facing the arc-shaped wall surface with the magnetic disk interposed therebetween. A formed housing;
At a position on the upstream side in the rotation direction of the magnetic disk from the head arm, the magnetic disk is disposed close to the recording surface of the magnetic disk, and the airflow generated around the recording surface due to the rotation of the magnetic disk is changed by the magnetic disk. A spoiler that moves toward the center of rotation,
A plate-shaped shroud having an arc-shaped wall surface facing the outer peripheral surface of the magnetic disk over a range from the position of the spoiler to an end of the arc-shaped wall surface of the housing in the rotational direction of the magnetic disk. Magnetic disk drive. The magnetic disk is composed of a plurality of magnetic disks stacked via a spacing ring, a plate-shaped spoiler is inserted and arranged as the spoiler between the plurality of magnetic disks, and the spoiler is sandwiched between the plate-shaped shrouds. 2. The magnetic disk drive according to claim 1, wherein the magnetic disk drive is fixed to the housing in such a manner as to be fixed. A communication passage for bypassing a part of the air damped by the spoiler and flowing to the downstream side of the head arm is formed in the space of the housing, and a communication passage of an entrance side opening of the communication passage is formed. 3. The magnetic disk drive according to claim 2, wherein the downstream side wall surface is formed by a side surface of a laminated portion of the plate-shaped shroud and the spoiler.

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