JP4651696B2 - Magnetic disk unit - Google Patents

Description

  The present invention relates to a magnetic disk apparatus having a suspension mechanism for supporting a head slider.

  In the hard magnetic disk device, as shown in FIGS. 6 to 7, a plurality of disk media 2 attached to the main shaft 1 and rotated in the direction indicated by the arrow A, and data is written to or read from the disk media 2. A plurality of head sliders 3 on which a magnetic head (not shown) is mounted are provided.

  Each head slider 3 is arranged at the front end of the actuator arm 5 so as to be positioned on the front side and the back side of each disk medium 2, and is around the actuator shaft 20 that is rotated around the axis by the voice coil motor 6. The head mounted on the head slider 3 writes or reads data to or from the rotating disk medium 2. 7 is a housing, and 8 is a motor for rotating the main shaft 1.

  By the way, in such a hard magnetic disk device, when data is written to or read from the disk medium 2, the head slider is slightly lifted from the surface of the disk medium. A suspension mechanism 14 is provided.

  As a conventional suspension mechanism, Patent Document 1 discloses a basic suspension mechanism that includes a load beam attached to a rigid arm portion and a flexible finger portion attached to the tip of the load beam and carrying a head slider. Is described. Such a suspension mechanism is now widely used.

  In general, the head slider is carried by the flexible flexure of the suspension mechanism, and a plurality of wires are used as signal input / output lines, and one end of each wire is connected to each signal terminal of the head mounted on the head slider. The other end is connected to each terminal provided on the flexible printed board extending from the recording / reproducing signal integrated circuit element.

  In recent years, the miniaturization and low flying height of the head slider has been promoted. At that time, the problem is that the rigidity of the wire wire for signal input / output affects the flying characteristics of the head slider. As described in Patent Document 3 and Patent Document 4, a wiring-integrated suspension mechanism in which wiring is integrally formed with the suspension mechanism has been developed.

  As shown in FIG. 8, the wiring-integrated suspension mechanism is a flexible structure that carries the wiring structure 34 including the conductive layers 41, 42, 43, 44 and the protective layers 45, 46 covering the conductive layers 41, and the head slider 3. The flexure 30 is provided with a base plate 33 and a load beam 31 that supports the flexure 30. The flexure 30 has a load beam so that the conductive layers 41, 42, 43, and 44 are located on the disk facing side. It is joined to the disc facing surface of 31 by spot welding.

  Conventionally, in a hard magnetic disk device, a contact start / stop method (hereinafter referred to as CSS method) and a load / unload method (hereinafter referred to as L / L) are used as means for retracting the head slider from the track when the disk is stopped. (Referred to as UL method).

  In the CSS system, the surface of the inner peripheral portion of the disk is roughened to some extent in order to prevent the tip of the suspension mechanism from moving to the inner peripheral portion of the disk and stopping the head slider from adsorbing to the disk surface when the disk is stopped. Therefore, the inner periphery of the disc cannot be used as a recording unit, which is disadvantageous in terms of recording capacity. As one means for increasing the recording capacity, there is a method of increasing the recording density of a row of information recorded in the circumferential direction, ie, the so-called linear recording density, by reducing the flying height of the head slider relative to the magnetic disk. However, in this CSS system, the surface roughness of the inner peripheral portion of the disk is hindered from lowering the flying height of the head slider.

  On the other hand, in the L / UL method, the disk surface can be uniformly smoothed, so that the gap between the head slider and the disk can be reduced and the recording capacity can be increased. Moreover, the L / UL system has an advantage that the inner periphery of the disk can be used as a recording part, which is advantageous in increasing the capacity. This L / UL method is also called a ramp load method. This is because a ramp block made of synthetic resin is disposed on the side of the disk, and the suspension mechanism moves to the retreat zone when the disk is stopped, and is supported by riding on the ramp block.

Among the ramp load systems, the one described in Patent Document 5 is called an end lift system, and as shown in FIGS. 9 to 11, a tab is formed at the tip of the suspension mechanism 14 so as to protrude in the longitudinal direction of the mechanism. 22 extends so that the tab 22 rides on the ramp block 21. Further, what is described in Patent Document 6 is referred to as a mid-lift system, and the main body of the suspension mechanism 14 rides directly on the ramp block 21 as shown in FIG.
Japanese Patent Publication No.58-22827 JP-A-53-30310 JP 60-246015 A JP-A-6-215513 Japanese Patent Laid-Open No. 11-96527 Japanese Patent Laid-Open No. 06-60579

  As described above, the head slider 3 carried by the flexure 30 draws an air flow generated by the rotation of the disk medium 2 between the disk medium 2 and forms and maintains a self-pressurizing air lubricating film. Although it floats from the disk surface, members of the suspension mechanism 14 other than the head slider 3 are also affected by the air flow. In this respect, in the wiring-integrated suspension mechanism that is generally used at present, the flexure 30 (wiring structure 34) is disposed on the disk-facing surface of the load beam 31 as described above. The opposing surface has a three-stage uneven shape composed of a first disk opposing surface height 51, a second disk opposing surface height 52, and a third disk opposing surface height 53, and the disk rotates as the disk rotates. When the air flow generated in this way flows into the gap between the disk medium 2 and the suspension mechanism 14, a wind turbulence is caused and the suspension mechanism 14 is vibrated. When the suspension mechanism 14 vibrates, the flying stability of the head slider 3 is impaired, and in the worst case, data cannot be written or read.

  Further, when the mid-lift system is configured by using the wiring-integrated suspension mechanism 14 that is generally used at present, when the head slider 3 is loaded onto the disk medium 2 or unloaded from the disk medium 2. In addition, since the suspension mechanism 14 and the ramp block 21 slide in contact with each other, there is a problem that the wiring structure 47 disposed on the disk facing surface of the suspension mechanism 14 may be damaged.

  Further, the suspension mechanism 14 used in the end lift system is disadvantageous in terms of design when raising the resonance point of the suspension mechanism 14 because the tip load increases by the amount of the tab 22 at the tip as described above. There is a problem that the increase in recording density by increasing the track density is hindered.

  Further, in order to increase the track density, which is one of the important factors for increasing the recording density, it is necessary to reduce the pitch of each recording track, and the recording track pitch is changed from the current 2 μm to 0.8 μm, for example. When narrowing, it is necessary to improve the positioning accuracy of the head slider 3 to the nano order. In order to improve the positioning accuracy, it is necessary to reduce the amplitude at the time of resonance of the vibration in the track width direction of the suspension mechanism 14 that carries the head slider 3. For this purpose, the rigidity of the suspension mechanism 14 is increased to reduce the vibration. Increasing the resonance point is an issue.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. In addition to suppressing the vibration caused by wind turbulence, the flying stability of the head slider can be secured, and a midlift system that is advantageous from the viewpoints of both linear recording density and track recording density is adopted. An object of the present invention is to provide a magnetic disk drive having a suspension mechanism that can prevent damage to the wiring structure that causes problems.

In order to solve the above-described problems, a magnetic disk device according to the present invention is a mid-lift magnetic disk device, and includes a load beam provided in a direction along the surface of the recording medium, and the load opposite to the surface of the recording medium. A suspension mechanism having a flexure bonded to one side surface of the beam, and a ramp block on which the suspension mechanism rides and contacts the main body when rotation of the recording medium stops, and the flexure moves the head slider near the tip. And a flexible substrate that bends as the head slider follows the surface of the recording medium, and a wiring structure that includes a conductive layer and a protective layer formed on the surface of the substrate. The load beam is positioned on the back surface of the flexure whose tip is opposite to the surface of the recording medium. The tip of the coaxiality toward a recording medium surface, characterized in that a structure for pressing the support.

  According to the above configuration, the surface facing the media of the suspension mechanism is the smooth surface of the load beam, that is, the surface where the flexure is not joined. it can. Moreover, although the suspension mechanism is a mid-lift system that rides on the ramp block, it does not damage the flexure wiring structure.

  As described above, according to the present invention, the flexure having the head slider and the wiring structure is bonded to one side surface of the load beam opposite to the surface of the recording medium, so that the smooth other side surface of the load beam is made to face the disk. It is possible to suppress vibration of the suspension mechanism due to wind turbulence, to ensure the flying stability of the head slider, and to avoid damage to the wiring structure despite the mid-lift system. Employing the midlift system makes it possible to increase the resonance point of the suspension mechanism as compared with the endlift system, which is advantageous in increasing the track density.

Embodiments of the present invention will be described below by taking a hard magnetic disk device as an example.
(Embodiment 1)
1 is a detailed view of a midlift type wiring-integrated suspension mechanism of a hard magnetic disk device according to a first embodiment of the present invention as viewed from the disk medium side, and FIG. 2 is a suspension mechanism of FIG. FIG. Since the entire configuration of the hard magnetic disk device is the same as that described above with reference to FIGS. 6 to 7, the description thereof is omitted with the aid of FIGS.

  1 to 2, the suspension mechanism 14 includes a flexure 30 including a flexible base 33 and a wiring structure 34 that support the head slider 3 in the vicinity of the tip, and a flexure 30 provided in a direction along the media 2. And a load beam 31 that supports the tip of 30. The load beam 31 is attached to the actuator arm 5 via a base plate 32.

  In the flexure 30, the wiring structure 34 is formed on the base 33 using a printed wiring technique such as etching, as shown in a cross section in FIG. 3, and the conductive layers 41, 42, 42 connected to the head slider 3, etc. 43 and 44 and protective layers 45 and 46 covering the same.

  The flexure 30 has a tongue-like shape in which the head slider carrying portion 30 a is surrounded by a U-shaped through hole 39, and is bent at bending portions 37 and 38 on both sides of the through hole 39, and is provided with a wiring structure 34. The region near the base plate 32 is covered with the load beam 31 up to the vicinity of the bent portions 37 and 38, and the joint portions 35 and 36 are opposite to the load beam 31, i. Spot welded.

  A support portion 31a that is convex in the longitudinal direction of the load beam 31 is formed at the distal end portion of the load beam 31, and this support portion 31a is inserted into the through hole 39 of the flexure 30 so that the head slider carrying portion of the flexure 30 is provided. It is located on the back of 30a. Adjustment in the height direction around the through-hole 39 is made by the bent portions 37 and 38.

  As a result, when the disk is not recorded or reproduced, the head slider carrying portion 30a of the flexure 30 is pressed and supported to the surface side of the disk medium 2 by the support portion 31a of the load beam 31, and the head mounted on the head slider carrying portion 30a. The slider 3 is pressed against the surface of the disk medium 2.

  At the time of recording / reproducing, the flexure 30 is deflected in the direction in which the head slider 3 is separated from the surface of the disk medium 2 due to the air flow generated by the rotation of the disk medium 2, and the head slider 3 floats from the surface of the disk medium 2 or lightly contacts the surface. It becomes a state.

  At this time, the disk-facing surface of the suspension mechanism 14 is the smooth other side surface 31A of the load beam 31 to which the flexure 30 is not joined. Suppressed and stable flying characteristics of the head slider 3 can be obtained.

On the other hand, in such a midlift suspension mechanism 14, the disk-facing surface is the other side surface 31 </ b> A of the load beam 31 that is smooth on the other side 31 </ b> A. It means that. Therefore, it is possible to perform loading or unloading operation without damaging the wiring structure 34, and it is possible to increase the resonance point of the suspension mechanism 14 because a tab that contacts and slides on the ramp block 21 is not required, thereby increasing the track density. This is advantageous.
(Embodiment 2)
FIG. 4 is a detailed view of the midlift type wiring-integrated suspension mechanism of the hard magnetic disk device according to the second embodiment of the present invention as viewed from the disk medium side, and FIG. 5 is a suspension mechanism of FIG. FIG.

  The suspension mechanism 14 of the second embodiment is different from that of the first embodiment in that a through-hole 40 is formed in a U shape in the load beam 31 on the tip side from the joint portions 35 and 36 with the flexure 30. The tip end portion of the flexure 30 including the head slider carrying portion 30a and the bending portions 37 and 38 is inserted into the through hole 40, and the load surrounded by the through hole 40 on the back surface of the tip portion of the inserted flexure 30 is inserted. This is that the support 31b of the beam 31 is located.

  As a result, when the disk is not recorded or reproduced, the head slider carrying portion 30a of the flexure 30 is pressed and supported to the surface side of the disk medium 2 by the support portion 31a of the load beam 31, and the head mounted on the head slider carrying portion 30a. The slider 3 is pressed against the surface of the disk medium 2.

  At the time of recording / reproducing, the flexure 30 is deflected in the direction in which the head slider 3 is separated from the surface of the disk medium 2 due to the air flow generated by the rotation of the disk medium 2, and the head slider 3 floats from the surface of the disk medium 2 or lightly contacts the surface. It becomes a state. Therefore, the same effect as described in the first embodiment can be obtained.

In the end lift type hard magnetic disk drive, the same effect can be obtained although the advantage of not requiring a sliding tab with the ramp block is not obtained.
Each of the above hard magnetic disk devices is only shown as a representative example, and the above suspension mechanism capable of suppressing vibration due to wind turbulence and preventing damage to the wiring structure is also useful for other data recording devices, It is also useful for hard magnetic disks that employ the CSS method. The wiring structure is not limited to the signal input / output line as described above, and may be a wiring structure used for any purpose.

  The magnetic disk device of the present invention can suppress the vibration due to wind turbulence and ensure the flying stability of the head slider, and is advantageous from the viewpoint of both the linear recording density and the track recording density, and is integrated with the suspension mechanism. Since damage to the structure can be prevented, it is widely useful.

1 is a plan view of a midlift suspension mechanism that constitutes a magnetic disk device according to a first embodiment of the present invention. 1 is an exploded perspective view of the suspension mechanism of FIG. AA sectional view of the suspension mechanism of FIG. FIG. 5 is a plan view of a mid-lift suspension mechanism that constitutes a magnetic disk device according to a second embodiment of the present invention. 4 is an exploded perspective view of the suspension mechanism of FIG. A perspective view showing a schematic overall configuration of a conventional magnetic disk device FIG. 6 is a longitudinal sectional view of the magnetic disk device of FIG. Sectional view of the suspension mechanism of the magnetic disk apparatus of FIG. Top view of a conventional magnetic disk drive equipped with an endrift type suspension mechanism Detailed view of suspension mechanism of magnetic disk apparatus of FIG. 10 is an exploded perspective view of the suspension mechanism of FIG. A plan view of a conventional magnetic disk drive equipped with a midlift type suspension mechanism

Explanation of symbols

2 Disc media (recording media)
3 Head slider 5 Actuator arm
14 Suspension mechanism
21 Lamp block
30 flexure
31 Load beam
31a, 31b Support part
33 Foundation
34 Wiring structure
35,36 joints
37,38 Bend
39 Through hole
40 Through hole
41,42,43,44 Conductive layer
45,46 Protective layer
99 heads

Claims (3)

A midlift magnetic disk device,
A load beam provided in a direction along the recording medium surface, and a suspension mechanism and a flexure joined to one side surface of the load beam contradictory to the recording medium surface,
A ramp block on which the suspension mechanism rides and contacts its main body when rotation of the recording medium stops ,
The flexure carries a head slider in the vicinity of the tip, and a flexible base that bends as the head slider follows the surface of the recording medium, and a conductive layer and a protective layer formed on the surface of the base A wiring structure consisting of
The load beam is configured such that a tip end portion thereof is positioned on the back surface of the flexure opposite to the recording medium surface and presses and supports the tip end portion of the flexure toward the recording medium surface.
A magnetic disk device characterized by the above . The flexure has a through hole on the tip side from the joint with the load beam, and the load beam is inserted into the through hole and positioned on the back surface of the flexure and presses the flexure toward the surface of the recording medium. Supporting structure
2. The magnetic disk apparatus according to claim 1, wherein The load beam has a through-hole on the tip side from the joint with the flexure, and the flexure is inserted in the through-hole and positioned on the medium facing surface of the load beam, and the load beam is used to record the surface of the recording medium. It was configured to be pressed and supported toward
2. The magnetic disk apparatus according to claim 1, wherein

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