HK1064500B

HK1064500B - Disk device

Info

Publication number: HK1064500B
Application number: HK04107222.1A
Authority: HK
Inventors: 桑岛秀树; 阪本宪一; 宫本诚
Original assignee: Panasonic Corporation
Priority date: 2001-02-13
Filing date: 2003-02-06
Publication date: 2005-12-16

Description

Disk device

The present invention is a divisional application of patent application No. 02105059.7 entitled "work head support device and disk device using the same", which is filed on 2002, 2, 11.d.

Technical Field

The present invention relates to a disk device such as a magnetic disk device, an optical disk device, or an optical disk device using a head support device having a floating head (head).

Background

A conventional head support device in a magnetic disk device such as a hard disk device will be described with reference to the drawings as an example of a head support device of a conventional disk device having a floating type head.

Fig. 11 is a plan view showing a head supporting device structure, a head supporting device, and a magnetic recording medium of a conventional magnetic disk device.

In fig. 11, a head supporting device 108 is composed of a suspension 102 having a relatively low rigidity, a plate spring portion 103, and a supporting arm 104 having a relatively high rigidity, and a slider 101 on which a magnetic head (not shown) is mounted is provided on a lower surface of one end of the suspension 102.

The magnetic recording medium 107 is designed to be rotatable by the spindle motor 109, and when recording and reproducing are performed in the magnetic disk apparatus, a magnetic head mounted on the slider 101 obtains a constant floating amount by a relationship between a buoyancy generated by an air flow generated by the rotation of the magnetic recording medium and a biasing force generated by the plate spring portion 103 for biasing the slider 101 toward the magnetic recording medium 107.

The head support device 108 is configured to rotate about the bearing 105 by the action of the voice coil 106 provided in the support arm 104 during recording and reproduction, thereby positioning the magnetic head mounted on the slider 101 with respect to a desired track on the magnetic recording medium 107 to perform recording and reproduction.

The magnetic disk apparatus shown in fig. 11 is a magnetic disk apparatus generally called a contact start/stop system (hereinafter referred to as CSS system), and has a feature that a magnetic head contacts the upper surface of the magnetic recording medium 107 when the magnetic recording medium 107 is stopped, and the magnetic head provided on the slider 101 floats from the magnetic recording medium 107 when recording and reproducing, as described above.

In the CSS magnetic disk apparatus, the region a of the magnetic recording medium 107 shown in fig. 11 is a region where magnetic recording is possible, and the region B is a region where the magnetic head is retracted when the magnetic disk apparatus is stopped, which is called a CSS region. When the rotation of the magnetic recording medium 107 is stopped, the magnetic head is first moved to the B region while being kept in a floating state. Then, the rotational speed of the magnetic recording medium 107 is decreased, so that the air flow between the magnetic recording medium 107 and the slider 101 is decreased, the buoyancy is decreased, and finally the magnetic head comes into contact with the magnetic recording medium 107 and stops in this state.

Therefore, in the magnetic recording medium 107 in the CSS type magnetic disk apparatus, the surface of the region B is rougher than the surface of the region a, and therefore, the magnetic head is prevented from being attracted to the magnetic recording medium 107 at the time of stopping and the magnetic recording medium 107 is prevented from being mechanically and magnetically damaged at the time of starting.

As another embodiment of the magnetic disk apparatus, there is a load/unload method (hereinafter, referred to as L/UL method).

Fig. 12 is a schematic perspective view showing the structure of a magnetic disk device of the L/UL system. In fig. 12, the head supporting device 108 is substantially similar to the structure of the CSS type head supporting device 108 shown in fig. 11, but the head supporting device 108 rotates around the bearing portion 105 and moves to the outside of the magnetic recording medium 107 when the magnetic disk apparatus is stopped. At this time, a terminal portion 110 is provided outside the magnetic recording medium 107, and the slider 101 supported by the suspension 102 is brought into contact with a tapered portion provided in the alligator clip portion 110, thereby preventing the slider 101 and the magnetic head from being attracted to the magnetic recording medium 107.

The structure and operation of the conventional head supporting apparatus will be described in more detail with reference to fig. 13. Fig. 13 is a perspective view of a main portion of a conventional head supporting apparatus in which a head portion is provided.

A magnetic head (not shown) is provided on the lower surface of one end of the suspension 102, facing the magnetic recording medium 112, of the slider 101, and the other end of the suspension 102 is bent to function as a leaf spring portion 103, and the leaf spring portion 103 is connected to the support arm 104. In the case of the CSS method, when the rotation of the magnetic recording medium is stopped, the slider 101 is in contact with the magnetic recording medium, and the slider 101 is pressed against the magnetic recording medium by the reaction force of the plate spring portion 103 against the magnetic recording medium.

As a necessary design condition of a head supporting device of a magnetic disk device, first, a predetermined load must be applied to a slider in a direction of a magnetic recording medium.

This is done to stably float the slider and to stably perform the output from the magnetic head placed on the slider even when there is an impact from the outside or the magnetic recording medium surface moves up and down during recording and reproduction.

In addition, when the magnetic recording medium surface moves up and down, the plate spring portion of the magnetic head supporting device must have a flexible structure in order to stabilize the biasing force applied to the slider.

On the other hand, the head support device is required to have high rigidity so as not to cause misalignment because the head support device is in an unnecessary vibration state, which hinders the tracking characteristic of the magnetic head placed on the slider.

Further, in order to achieve a reduction in size, particularly a reduction in thickness, of the magnetic disk device, it is necessary to make the magnetic head support device thin in a direction perpendicular to the surface of the magnetic recording medium.

However, in the conventional magnetic head supporting apparatus, since the suspension and the supporting arm are connected by the plate spring portion as described above, it is required to satisfy the opposite requirements in order to satisfy various requirements of the magnetic head supporting apparatus.

Specifically, first, in order to stably float the slider on which the magnetic head is placed, a sufficient reaction force is required for the plate spring portion to apply a necessary load to the slider. For this reason, the material, thickness, etc. of the suspension are adjusted by changing the bending (forming) angles of the suspension and the plate spring portion.

Next, in order to prevent variations in the amount of load of the slider in the direction of the magnetic recording medium due to variations in the distance between the slider and the magnetic recording medium for each magnetic disk apparatus during vertical movement of the magnetic recording medium and mass production, etc., the head support device must have a certain degree of flexibility. Therefore, in the conventional magnetic head supporting device, the notch 111 shown in fig. 13 is provided in the plate spring portion, whereby the rigidity of the plate spring portion is lowered, and the elastic coefficient thereof is also reduced, thereby realizing a flexible design.

In addition, when the suspension is formed in a thin plate structure in order to improve the flexibility of the plate spring portion, the frequency of the main resonance point, that is, the resonance frequency, is lowered when the head supporting device is moved for positioning, and a vibration mode such as torsion occurs. As a result, it takes time to stabilize (adjust) the generated vibration, and as a result, there is a limit to shortening the access time.

Further, in the conventional magnetic head supporting device, since the center of gravity is closer to the magnetic head than the plate spring portion, when a strong impact is applied to the magnetic disk device from the outside, a balance between a buoyancy caused by an air flow generated by rotation of the magnetic recording medium in the slider portion and a biasing force biasing the slider toward the magnetic recording medium side by the magnetic head supporting device is lost, and the slider jumps from the magnetic recording medium. Therefore, the slider collides with the magnetic recording medium, and there is a possibility that the magnetic or mechanical damage may be given to the magnetic recording medium.

The load applied to the slider is determined by the shape of the leaf spring portion, but the load applied varies depending on the type of the slider, and the suspension must be changed depending on the slider.

In addition, when a desired load cannot be obtained due to variation in the shape of the leaf spring portion, only a method of discarding the suspension is adopted. The reason for this is that the shape of the plate spring portion has a large relationship with the resonance characteristics of the suspension as well as the load adjustment. Therefore, the resonance characteristics of the suspension are sacrificed when the load is adjusted later.

The above-described problems are not specific to the magnetic disk device, and similar problems are found in disk devices having a floating type head, such as optical disk devices and magneto-optical disk devices.

Disclosure of Invention

The working head supporting device comprises a supporting arm and a working head arranged below one end of the supporting arm. The support arm is rotatable in a radial direction of the recording medium and in a direction perpendicular to the recording surface with the bearing portion as a rotation center. The supporting arm is provided with an elastic device for applying a pressing force to the recording medium.

Thus, since the rigid portion and the elastic portion can be independently designed, the support arm portion can be formed of a highly rigid member in the case of an external impact, and since the pressing force applied to the slider by the elastic means can be set arbitrarily, the impact resistance can be very high, and the resonance frequency can be increased, thereby providing a work head support device having a high response characteristic and capable of high-speed access.

Further, since the head support device is configured to be rotatable in the vertical direction, the head can be separated from the recording medium and held when the recording medium is stopped.

In addition, the working head supporting device comprises a supporting arm and a working head arranged below one end of the supporting arm. The support arm is rotatable in the radial direction of the recording medium and in the direction perpendicular to the recording surface with the bearing portion as the rotation center, and the support arm is provided with an elastic means for applying a pressing force in the direction of the recording medium. A pair of tip bearings having tips are provided in the bearing portion and connected to the support arm, and the support arm is rotatable in a direction perpendicular to the recording surface with a point at which the tips of the tip bearings are connected to the support arm as a fulcrum.

Thus, the rotation center can be accurately determined with a simple configuration, and the work head positioning control can be performed more accurately.

Further, since the pair of top portions provided in the tip bearing are in contact with the support arm on a line perpendicular to the axial direction of the bearing portion and the longitudinal direction of the support arm and passing through the center of rotation of the recording medium in the radial direction of the bearing portion, it is possible to provide a work head support device having a good weight balance in the longitudinal direction of the support arm and excellent impact resistance.

Further, by providing the respective top portions of the spindle nose bearing at positions symmetrical with respect to the center line in the longitudinal direction of the support arm, it is possible to provide a work head support device having a good weight balance in the width direction of the support arm and having excellent impact resistance.

In addition, the working head supporting device comprises a supporting arm and a working head arranged below one end of the supporting arm. The support arm is rotatable in a radial direction of the recording medium and in a direction perpendicular to the recording surface with the bearing portion as a rotation center. The supporting arm is provided with an elastic means for applying a pressing force in the direction of the recording medium, and the supporting arm includes a fixing means for fixing the elastic means to the bearing portion and an adjusting means for adjusting the fixing position of the elastic means to the bearing portion by the fixing means so that the amount of deformation of the elastic means is variable.

Thus, the pressing force of the slider against the magnetic disk medium can be arbitrarily adjusted, and even if the load weight specification of the slider changes, the head support mechanism does not need to be changed.

Further, by providing the adjustment means as a spacer adjustment pad provided between the elastic means and the bearing portion, it is possible to provide a work head support device capable of adjusting the pressing force with a simple structure.

In the head support device according to the present invention, the elastic means is formed by a plate spring portion provided between the bearing portion and the support arm, and therefore, the head support device having a thin structure in the vertical direction of the recording medium can be easily provided.

Further, in the work head support device of the present invention, since the work head is supported by the slider provided on the support arm, the work head can be floated more accurately by the design of the air lubrication surface of the slider.

Further, by providing a gimbal mechanism for supporting the slider freely in the sway direction and the pitch direction on the support arm, unnecessary tilting of the slider with respect to the sway direction and the pitch direction of the recording medium during operation can be absorbed by the gimbal mechanism.

In the disk support device of the present invention, the center of gravity of the portion held by the elastic means is aligned with the intersection of the radial rotation axis of the support arm with respect to the recording medium and the vertical rotation axis with respect to the recording surface of the recording medium, whereby the unnecessary vibration of the support arm can be minimized in the case of an external impact or the like.

The disk device of the present invention includes a recording medium, a rotation device, a support arm, an elastic device, and a drive device. The rotation device rotates the recording medium, the support arm has a slide block with work head on the surface opposite to the recording medium and can rotate around the bearing part in the direction along the recording surface of the recording medium and the direction perpendicular to the recording surface, the elastic device gives the support arm the pressure near the recording medium, and the driving device rotates the support arm in the radius direction of the recording medium.

With this configuration, when an impact is applied from the outside, the support arm portion can be formed of a highly rigid member, and the pressing force applied to the slider by the elastic means can be set arbitrarily. Therefore, the shock resistance is very high, and the resonance frequency is improved, thereby providing a disk device having high response characteristics and high access speed.

The disk device of the present invention includes a recording medium, a rotation device, a support arm, an elastic device, and a drive device. The rotation device rotates the recording medium, the support arm has a slider on one end facing the recording medium and capable of rotating around the bearing part in the direction along the recording surface of the recording medium and in the direction perpendicular to the recording surface, the elastic device gives the support arm pressure near the recording medium, and the driving device rotates the support arm in the radial direction of the recording medium. A bearing portion is provided with a shaft tip bearing having a pair of tip portions so as to connect the support arms, and the support arms are rotatable in a direction perpendicular to the recording surface with a contact point between the tip portion of the shaft tip bearing and the support arms as a fulcrum.

With this configuration, since the rotation center can be accurately determined with a simple configuration, the work head positioning control can be performed more accurately.

Further, by bringing a pair of top portions provided on the pivot bearing into contact with the support arm on a line perpendicular to the axial direction of the bearing portion and the longitudinal direction of the support arm and passing through the center of rotation of the recording medium in the radial direction of the bearing portion, a disk device having a good weight balance in the longitudinal direction of the support arm and excellent shock resistance can be provided.

Further, by providing the respective top portions of the pivot bearings at positions symmetrical with respect to the longitudinal center line of the support arm, it is possible to provide a disk device having a good weight balance in the width direction of the support arm and having excellent shock resistance.

A disk device of the present invention includes a recording medium, a rotation device for rotating the recording medium, a support arm having a surface opposite to the recording medium on which a slider for placing a working head is mounted, the support arm being rotatable about a bearing portion in a direction along the recording surface of the recording medium and in a direction perpendicular to the recording surface, an elastic device for applying a pressing force to the support arm in a direction close to the recording medium, and a drive device for rotating the support arm in a radial direction of the recording medium. The disk device further comprises a fixing means for fixing the elastic means to the bearing portion and an adjusting means for adjusting the fixing means to fix the elastic means to the bearing portion and to change the amount of deformation of the elastic means.

With this structure, the pressure of the slider against the recording medium can be arbitrarily adjusted without changing the head support mechanism even if the load form of the slider changes.

Further, by providing the adjusting means as a pad for a regulating blade provided between the elastic means and the bearing portion, a disk device capable of adjusting the pressing force with a simple structure can be provided.

A disk device of the present invention includes a recording medium, a rotation device for rotating the recording medium, a support arm having a slider on which a working head is mounted on a surface of one end of the support arm facing the recording medium and capable of rotating in a direction along and perpendicular to the recording surface of the recording medium with a bearing portion as a rotation center, an elastic device for applying a pressing force in a direction close to the recording medium to the support arm, and a drive device for rotating the support arm in a radial direction of the recording medium. The disk device further includes a pressing device for rotating the support arm in the radial direction of the recording medium, and reducing the pressing force applied to the support arm by the elastic device when the working head is retracted in a contact state on a predetermined region on the recording surface of the recording medium.

With this configuration, when the support arm is rotated in the radial direction of the recording medium, the pressing means having a small elastic coefficient is brought into contact with and pressed against the other side of the support arm, so that the suction between the head or the slider and the recording medium can be prevented, and the load applied to the spindle motor as the rotating means of the recording medium at the time of starting can be reduced as much as possible, and a disk device having a simple structure, a small size, a thin shape, excellent impact resistance, and excellent moving performance and capable of high-speed access can be provided.

Further, the pressing means is a plate spring disposed on the other side of the support arm and presses down the other side of the support arm when the working head is retracted, so that a structure in which the suction between the working head or the slider and the recording medium is prevented without using any other power can be realized with a simple structure.

Further, by configuring the pressing means to reduce the force equal to or slightly smaller than the pressing force applied to the support arm, a structure having a better effect of preventing the suction between the head or the slider and the recording medium can be realized.

Further, in the disk device of the present invention, the driving unit can realize higher-speed rotation by the action of the voice coil provided in the support arm.

In the disk apparatus of the present invention, the elastic means is constituted by a plate spring portion provided between the bearing portion and the support arm, so that the disk apparatus having a thin structure in a direction perpendicular to the recording medium can be easily provided.

Further, in the disk apparatus of the present invention, since the gimbal mechanism for supporting the slider in the sway direction and the pitch direction is provided in the support arm, unnecessary inclination of the slider with respect to the sway and pitch directions of the recording medium can be absorbed by the gimbal mechanism at the time of reproduction by the recording apparatus.

Further, in the disk apparatus of the present invention, the center of gravity of the portion held by the elastic means is located at the intersection of the rotation center axis of the support arm in the radial direction of the recording medium and the rotation center axis in the direction perpendicular to the recording surface of the magnetic recording medium, whereby unnecessary vibration of the support arm can be minimized in the case of an external impact or the like.

Drawings

FIG. 1 is a side view showing the operation principle of a head supporting apparatus according to a first embodiment of the present invention;

FIG. 2 is a plan view showing the principle of operation of the head supporting apparatus according to the first embodiment of the present invention;

FIG. 3 is a perspective view showing a structure of a head supporting apparatus according to a second embodiment of the present invention;

FIG. 4 is an exploded perspective view showing a structure of a head supporting apparatus according to a second embodiment of the present invention;

FIG. 5 is a side view showing a main portion in the vicinity of a bearing portion in a head supporting device structure according to a second embodiment of the present invention;

FIG. 6 is a plan view showing the structure of a magnetic disk apparatus of a third embodiment of the present invention;

FIG. 7 is a sectional view showing the structure of a magnetic disk apparatus of a third embodiment of the present invention;

FIG. 8 is an exploded perspective view showing a head supporting device structure of a magnetic disk apparatus of a third embodiment of the present invention;

FIG. 9 is a perspective view showing the structure of a pressing device of a magnetic disk apparatus according to a third embodiment of the present invention;

FIGS. 10A to 10C are schematic views showing the operation of a magnetic disk apparatus according to a third embodiment of the present invention;

FIG. 11 is a plan view showing a structure of a head supporting unit and a relationship between the head supporting unit and a magnetic recording medium of a conventional CSS type magnetic disk apparatus;

FIG. 12 is a schematic perspective view showing the structure of a conventional L/UL magnetic disk device;

fig. 13 is a perspective view of a main portion of a conventional head support device in which a head unit is provided.

Detailed Description

First embodiment

First, as a first embodiment, a magnetic disk device will be described as an example of the operation principle of the head supporting device of the present invention.

Fig. 1 is a side view showing the schematic structure of a head support device according to the present invention, fig. 2 is a plan view thereof, and fig. 3 is an exploded structure view thereof.

In fig. 1 and 2, a slider 1 having a magnetic head (not shown) provided thereunder is placed under one end of a support arm 2, and is fixed to one end of a plate spring portion 4 at the other end as shown. The other end of the plate spring portion 4 is fixed to the spring fixing portion 5 and fixed to the tip bearing 11 via the adjustment sheet partition plate 50.

Thereby, the support arm 2 is elastically held by the tip bearing 11 via the plate spring portion 4.

Further, the journal bearing 11 is provided with a pair of top portions 11a and 11b, which are in point contact with the support arm 2 at a point Pa and a point Pb in fig. 2, respectively, and one end of the support arm 2 is pressed in the direction of the magnetic recording medium 12 by the elastic force of the plate spring portion 4, and at this time, compressive stress is generated at the contact points Pa and Pb. In the absence of the magnetic recording medium 12, the plate spring portion 4 is deformed, and the support arm 2 is positioned as shown by the broken line in fig. 1.

The respective top portions 11a and 11b of the journal bearing 11 are perpendicular to the direction of the rotation center axis of the support arm 2 when the support arm 2 rotates in the radial direction of the magnetic recording medium 12 and the longitudinal direction of the support arm 2, and are disposed so as to contact the support arm 2 on a line passing through the rotation center axis.

When the magnetic disk apparatus is in operation, the support arm 2 is in a state shown by solid lines in fig. 1 by the respective top portions 11a and 11b of the spindle nose bearing 11. At this time, the plate spring portion 4 changes from a flat state to a substantially S-shape as shown in fig. 1. The pressing force, i.e., the load, given to the slider 1 at this time is generated by the elastic force of the plate spring 4 with the respective tops 11a and 11b of the journal bearing 11 as fulcrums of the levers.

Here, the amount of deformation of the plate spring 4 may be changed depending on the thickness of the flap 50. That is, after the support arm 2 is attached, when the pressing force applied to the slider 1 is measured and does not satisfy the standard value, the pressing force of the slider 1 can be adjusted by changing the thickness of the flap 50. The pressure can be increased by thinning the thickness of the tab separator 50 and decreased by thickening the thickness of the tab separator 50.

At this time, even if the pressing force of the slider 1 is changed by changing the thickness of the adjustment sheet partition plate 50, the position of the support arm 2 with respect to the magnetic recording medium 12 is not changed, and the floating characteristic of the slider 1 is not affected. As shown in fig. 13, in the conventional magnetic head supporting apparatus, if the pressing force of the slider 101 is changed by changing the mounting height of the suspension 102, the inclination of the suspension 102 with respect to the magnetic recording medium 112 is changed. Therefore, the attitude of the slider 101 is slightly changed, which affects the floating characteristic of the slider 101, and causes a bad influence such as necessity of redesigning the air lubrication surface shape of the slider 101.

According to the structure of the head support apparatus of the present embodiment, the support arm 2 can be formed of a material having high rigidity. For this reason, the head support apparatus can be formed of a structure and a material having high rigidity from the spindle tip bearing 11, the respective top portions 11a and 11b of the spindle tip bearing, the entire region from the region where the spindle tip bearing 11 supporting the support arm 2 is supported to the region where the slider 11 is formed.

Thus, if the support arm 2 is formed of a highly rigid structure or material, the resonance frequency of the support arm 2 can be increased, and the vibration state which has been a problem in the related art does not occur, so that it is not necessary to perform a stable operation, and the support arm 2 can be rotated and positioned at a high speed, and the access speed of the magnetic disk device can be increased.

Further, since the plate spring portion 4 as the elastic means is not mounted on the support arm 2 but is provided separately from the support arm 2, the strength and the elastic coefficient of the plate spring portion 4 can be selected by changing the thickness, the material, and the like of the plate spring portion 4, and the biasing force applied to the slider 1 can be easily adjusted.

Further, according to the structure when the magnetic head support device is used, the gravity center position of the portion held by the plate spring portion 4, for example, when the voice coil motor is rotated, the gravity center position of the support arm 2 in the state where the voice coil and the bobbin are attached, the intersection of the rotation axis in the radial direction of the magnetic recording medium 12 of the support arm 2 and the rotation axis in the direction perpendicular to the recording surface of the magnetic recording medium 12 are integrated, that is, the magnetic head support device is designed so that the gravity center position is substantially the same position as the midpoint P of the line connecting the contact points Pa and Pb of the top portions 11a and 11b of the support arm 2 and the spindle nose bearing 11 (in fig. 2, the distance between the point P and the point Pa and the distance between the point P and the point Pb are equal to L), and it is possible to provide a stable magnetic head support device with less vibration corresponding to external impact or. At this time, a head supporting device having the maximum impact resistance can be provided, but there is no problem even if there is a slight deviation in practical use.

Further, as shown in fig. 1, by providing the gimbal mechanism 13 on the support arm 2 and supporting the slider 1 by the dimple 14 formed on the lower surface of one end of the support arm 2, it is possible to realize a flexible head supporting apparatus which follows up unnecessary vibrations in the sway direction and the pitch direction of the slider 1 with respect to the magnetic recording medium 12 during the operation of the magnetic disk apparatus.

As described above, in the magnetic head supporting apparatus of the present invention, the operations of the different components can be independently controlled to achieve the contradictory requirements of increasing the pressing force of the slider 1, increasing the flexibility, and increasing the rigidity of the magnetic head supporting apparatus.

That is, the adjustment of the load by the pressing force and the adjustment of the elastic coefficient of the plate spring portion can be performed by changing the materials of the plate spring portion 4 and the tab spacer 50 and adjusting the thicknesses thereof. Further, the rigidity can be adjusted by changing the material of the support arm 2, the box-shaped member bending, or the like, and a high-rigidity structure can be realized. Thus, the head support device can be easily designed while the degree of freedom of design is dramatically expanded, while the contrary requirements of flexibility and high rigidity are solved.

Further, in the magnetic head supporting apparatus of the present invention, the plate spring portion 4 is a flat plate in a state where no force is applied. Therefore, it is not necessary to perform a preliminary process such as a very precise forming process (bending process) on the plate spring portion as in the conventional magnetic head supporting apparatus, and therefore the magnetic head supporting apparatus can be manufactured more easily than in the conventional one.

Further, when the pressing force of the slider 1 is changed by changing the specification of the slider 1, the conventional suspension must be changed to a suspension having a pressing force corresponding to a new slider, and the magnetic head supporting apparatus of the present invention has an advantage that the pressing force can be adjusted by adjusting the plate spring portion 4 and the diaphragm 50 using the same support arm without changing the suspension.

Hereinafter, the operation of the head supporting device of the present invention will be described with reference to fig. 1 and 2, taking a magnetic disk device as an example.

As described above, when the slider 1 and the magnetic recording medium 12 are in contact with each other when the magnetic recording medium 12 is stopped, but when the magnetic recording medium 12 starts to rotate during recording and reproduction, the slider 1 floats upward, the plate spring portion 4 is deformed, and the supporting arm 2 keeps a certain gap between the magnetic head and the magnetic recording medium 12 in a state shown by a solid line in fig. 1, that is, a floating amount.

In this case, the reaction force of the plate spring portion 4 to return the support arm 2 to the state shown by the broken line in fig. 1 becomes a load to be applied back to the slider 1.

The load applied to the slider 1 can be designed by adjusting the material and thickness of the plate spring portion 4, the height of the top portions 11a and 11b of the journal bearing 11, the positional relationship with the point G in fig. 1 which is the connecting portion between the support arm 2 and the plate spring portion 4, and the thickness of the adjustment piece spacer 50.

For example, by making the plate spring portion 4 thick with a material having high rigidity, a large load can be applied, and by increasing the heights of the top portions 11a and 11b of the journal bearing 11 or by bringing the position of the point G of the connection portion between the support arm 2 and the plate spring portion 4 close to the point P in fig. 1, a large load can be applied to the slider 1. Further, by making the thickness of the flap 50 thin, a large load can be applied; by increasing the thickness of the flap 50, the load can be made small.

Second embodiment

The following describes, as a second embodiment of the present invention, a structure of a head supporting apparatus of the present invention that realizes the operation principle described in the first embodiment.

FIG. 3 is a perspective view showing the structure of a magnetic head supporting device of the present invention, FIG. 4 is an exploded perspective view, and FIG. 5 is a side view of a main portion in the vicinity of a bearing portion.

As shown in fig. 3 and 4, in the head supporting device 9, the annular plate spring portion 4 and the similar annular spring fixing member 5 are connected by the solder points 4a, 4b, 4c, and 4 d. The support arm 2 and the plate spring portion 4 are connected by welding points 4e, 4f, 4g, and 4 h. The support arm 2 is connected to a coil holder 8 to which the coil 3 is attached so as to be rotatable in the radial direction of the magnetic recording medium 12 by a voice coil motor. These components are held together with the tip bearing 11, the adjustment flap spacer 50, and the collar 26 by the bearing portion 10 and the nut 27.

As shown in fig. 5, the magnetic head support device 9 is integrally supported by the frame 15 by the mounting screws 7 provided in the bearing portions 10.

The connection of the components will be described in more detail with reference to fig. 5. First, the upper surface of the plate spring portion 4 is connected to the lower surface of the support arm 2 in the portion of the rotation shaft facing the right side of the drawing, and the plate spring portion 4 and the spring fixing member 5 are sandwiched by the bearing portion 10 and the nut 27 together with the collar portion 11c of the toe bearing 11 and the vane spacer 50 in the portion facing the left side of the drawing. In addition, a coil support 8 is mounted on the support arm 2.

With this configuration, the plate spring portion 4 is deformed and bent into a substantially S-shape as shown in fig. 5, and the support arm 2 can be elastically held.

The bearing 10 is provided with a bearing, and the support arm 2 is rotatable in the radial direction of the magnetic recording medium to move the magnetic head provided on the lower surface of one end thereof to a predetermined position.

The top portions 11a and 11b of the journal bearing 11 are arranged perpendicular to the axial direction of the bearing portion 10 and the longitudinal direction of the support arm 2, and contact the support arm 2 on a line passing through the rotation center of the bearing portion 10 in the radial direction of the magnetic recording medium.

Further, the respective top portions 11a and 11b of the pivot bearing 11 are provided at symmetrical positions with respect to the center line of the support arm 2 in the longitudinal direction, and the pair of top portions 11a and 11b forms a structure for pressing down the support arm 2.

Further, the magnetic head supporting device 9 is designed such that the position of the center of gravity of the portion held by the plate spring portion 4, that is, the position of the center of gravity of the support arm 2 in the state where the coil 3 and the coil holder 8 are mounted, is substantially the same as the midpoint P of the connecting line between the support arm 2 and the contact points Pa and Pb of the respective top portions 11a and 11b of the shaft tip bearing 11 (in fig. 4, the distance between the point P and the point Pa and the distance between the point P and the point Pb are equal to each other by L), whereby a stable magnetic head supporting device with less vibration corresponding to external impact or the like can be provided. At this time, a head supporting device having the maximum impact resistance can be provided, but there is no problem even if there is a slight deviation in practical use.

The magnetic head supporting device 9 may be formed in consideration of the weight of the slider 1 and the gimbal mechanism 13 so that the center of gravity of the support arm 2 in the state where the coil 3, the coil yoke 8, the slider 1, and the gimbal mechanism 13 are mounted is substantially the same as the point P.

The respective components are explained below. First, the support arm 2 is integrally formed with a thickness of 64 μm with a metal, for example, stainless steel (SUS 304). The support arm 2 may be formed by etching or impact machining.

By using such a support arm 2, the resonance frequency can be increased from about 2kHz, which is conventionally used, to about 10kHz, which is very high. Therefore, a magnetic disk device having a higher rotational speed and a higher access speed than those of the conventional magnetic head supporting device can be obtained.

In the tip end region of the support arm 2 shown by C in fig. 4, a bent portion having a height of about 0.2mm may be provided in a direction perpendicular to the recording surface of the magnetic recording medium in order to increase the rigidity in the longitudinal direction.

In fig. 3, the slider 1 is supported by a gimbal mechanism 13 so as to be tiltable in the roll direction and the pitch direction by means of a dimple (not shown), and a magnetic head is provided on a surface of the slider 1 facing the magnetic recording medium 12.

The spring fixing member 5 is formed to have a thickness of 0.1mm by using a metal such as stainless steel (SUS304), and the plate spring portion 4 is formed to have a thickness of 38 μm by using a metal such as stainless steel (SUS304), and they can be formed by etching or press working.

Further, the coil support 8 is formed with a thickness of 0.3mm with a metal, for example, with aluminum (Al) or PPS (polyphenylene sulfite). When the material is formed of aluminum (Al), a die casting or press working method is used, and when PPS is used, a known resin molding method can be used.

The joining of the members may be performed by a known method such as spot welding, ultrasonic welding, or laser welding.

In the present invention, the method of manufacturing the members or the method of connecting the members to each other is not limited at all.

According to the above configuration, the head supporting device can be provided which realizes the operation principle shown in the first embodiment.

In addition, according to the structure of the magnetic head supporting device 9, the supporting arm 2 can freely rotate in the direction perpendicular to the recording surface of the magnetic recording medium with the top portions 11a and 11b of the spindle bearing 11 as the fulcrum, so that a new operation which is not available at present can be performed.

That is, in the CSS type magnetic disk apparatus, for example, since the support arm 2 cannot be moved up and down arbitrarily in the vertical direction of the magnetic recording medium in the related art, it is necessary to make the surface of the region B rougher than the surface of the region a in fig. 11 to prevent the slider 1 from being attracted to the magnetic recording medium 12 at the time of stopping. In the magnetic head supporting apparatus according to the present invention, the supporting arm 2 can be moved up and down by a known mechanism, and the supporting arm 2 can be separated from the magnetic recording medium 12 and held when the magnetic disk apparatus is stopped. For this reason, the magnetic recording medium 12 does not need a head retraction region such as the B region (CSS region) shown in fig. 11.

In the case of the L/UL magnetic disk apparatus shown in fig. 12, the support arm 2 can be moved up and down by a known apparatus by using the magnetic head supporting apparatus of the present invention, as in the case of the CSS magnetic disk, and the support arm 2 can be separated from the magnetic recording medium 12 and held when the magnetic disk apparatus is stopped. Therefore, as in the conventional technique, the useless region where the alligator clip portion for loading and unloading the magnetic head is provided at the end portion of the magnetic recording medium can be reduced.

Further, in the present embodiment, the structure in which the head suspension 9 includes the regulator blade spacer 50 is shown, but the head suspension of the present invention is not limited to this, and a structure in which the regulator blade spacer 50 is not included may be adopted. In this case, the biasing force applied to the slider 1 can be adjusted by changing the material, thickness, and the like of the plate spring portion 4.

In addition, although the embodiments of the present invention have been described with respect to the head support device of the magnetic disk device using the magnetic head, the disk device of the present invention has the same effect as that of the head support device of the disk device using the non-contact type magnetic head, for example, the optical disk device, the magneto-optical disk device, and the like.

Third embodiment

As a third embodiment, the configuration of a disk device according to the present invention will be described with reference to a disk device as an example. Fig. 6 is a plan view showing the structure of a magnetic disk device 23 of the present invention, and fig. 7 is a cross-sectional view taken along line AA in fig. 6.

First, the structure and operation of the magnetic disk apparatus and the head supporting apparatus according to the present invention will be described.

Fig. 6 and 7 show a state where the magnetic disk apparatus is stopped, that is, the rotation of the magnetic recording medium is stopped.

As shown in fig. 6 and 7, the magnetic disk apparatus 23 of the present invention includes a head support 9, and the head support 9 includes a support arm 2 formed of a single-piece material.

The structure of the head supporting device 9 in the magnetic disk device 23 of the present invention will be described with reference to fig. 6, 7 and 8. Fig. 8 is an exploded perspective view showing a part of a head supporting device 9 in a magnetic disk device 23 of the present invention.

In fig. 7, the magnetic head supporting device 9 has a structure in which a substantially annular plate spring portion 4 is connected to a semicircular annular spring fixing member 28 in a region of the rotation axis facing the left side of the paper, and the plate spring portion 4 is connected to the support arm 2 in a region of the rotation axis facing the right side of the paper. The support arm 2 is connected to a coil holder 8 to which the coil 3 is attached, and is rotatable in the radial direction of the magnetic recording medium 12 by the action of a voice coil motor. These members are held by the bearing portion 10 and the nut 27 together with the toe bearing 11 and the collar 26.

With this configuration, as shown in fig. 7, the support arm 2 is elastically held by a tip bearing 11 having a pair of top portions 11a and 11b via a plate spring portion 4, and the support arm 2 is rotatable in the vertical direction with respect to the magnetic recording medium 12 with the top portions 11a and 11b of the tip bearing 11 as fulcrums.

The pair of top portions 11a and 11b formed on the spindle bearing 11 are provided so as to be perpendicular to the direction of the rotation center axis of the support arm 2 when the support arm 2 rotates in the radial direction of the magnetic recording medium 12 and the longitudinal direction of the support arm 2, and are in contact with the support arm 2 at symmetrical positions with respect to the center line of the support arm 2 on a line passing through the rotation center axis.

The support arm 2 mounts a slider 1 having a magnetic head (not shown) on a surface facing the magnetic recording medium 12, on the surface facing the magnetic recording medium 12 at one end.

Further, the coil 3 attached to the coil holder 8 connected to the other end side of the support arm 2, and the magnet 20, the upper yoke 19 (not shown in fig. 6), and the lower yoke 21 provided on the frame 15 of the magnetic disk device 23 form a voice coil motor (hereinafter, VCM)24, and by the action of the VCM24, the support arm 2 is rotatable in the radial direction with respect to the magnetic recording medium 12 about the bearing portion 10. The bearing unit 10 is rotatably mounted on the frame 15 by a mounting screw 7 formed by a bearing.

The magnetic recording medium 12 is supported by a spindle motor 30 as a rotation device, and the magnetic head placed on the slider 1 is lifted up by a predetermined amount with respect to the magnetic recording medium 12 to perform recording or reproduction by a relationship between a buoyancy caused by an air flow generated by rotation of the magnetic recording medium 12 by the spindle motor 30 and a pressing force of a head supporting device 9 for pressing the slider 1 toward the magnetic recording medium 12 when the magnetic disk device 23 is in a state where the magnetic head is loaded at the time of recording or reproduction.

At this time, a predetermined biasing force, i.e., a load is applied to the slider 1 in the direction of the magnetic recording medium 12. The load is given by the plate spring portion 4 as an elastic means provided on the head support 9.

As shown in fig. 7 and 8, the gimbal mechanism 13 using gimbal springs supports the slider 1 so as to be tiltable in the sway direction and the pitch direction via the dimple 14, and thus the gimbal mechanism 13 can absorb unnecessary tilting of the slider 1 in the sway direction and the pitch direction with respect to the magnetic recording medium 12 during recording and reproducing in the magnetic disk apparatus 23.

The rotation and stop of the magnetic recording medium 12 and the rotation of the support arm 2 are all controlled by the control device 25 shown in fig. 6.

The respective components are explained below. First, in the present embodiment, the support arm 2 is integrally formed of a metal, for example, stainless steel (SUS 304). The support arm 2 may be formed by etching or punching.

The plate spring portion 4 is made of metal, for example, stainless steel (SUS 304). The formation may be carried out by processing or forming by etching or press working.

The coil support 8 is formed of a metal, for example, aluminum (Al), or a resin material, for example, PPS (polyphenylene sulfite) or LCP (liquid crystal polymer). When the resin is formed of aluminum, it is formed by die casting or press working, and when PPS or LCP is used, it is formed by a known resin molding method.

The upper yoke 19 and the lower yoke 21 are made of a soft magnetic material such as SECC, and can be formed by press working.

The magnet 20 is a rare earth magnet of neodymium, iron, and boron system.

In the magnetic disk apparatus 23 of the present invention, the head support unit 9 is structured as described above, so that the support arm 2 can be formed of a material having high rigidity.

For this reason, the head supporting device 9 can be formed of a material having high rigidity in the entire region from the spindle tip bearing 11, the respective top portions 11a and 11b of the spindle tip bearing 11, the region of the spindle tip bearing 11 supporting the support arm 2 to the region where the slider 1 is formed.

Further, if the support arm 2 is integrally formed of a material having high rigidity, for example, stainless steel (SUS304), it is possible to increase the impact resistance against an impact from the outside, and to increase the resonance frequency of the support arm 2 from about 2kHz, which is conventionally used, to a very high frequency of about 10kHz, so that a head supporting apparatus having a higher rotation speed and access speed than those of the head supporting apparatus can be obtained.

Further, since the plate spring portion 4 as the elastic means is not incorporated in the structure of the support arm 2, but is provided independently of the support arm 2, the strength and the elastic coefficient of the plate spring portion 4 can be selected by changing the thickness, the material, and the like of the plate spring portion 4.

Further, according to the structure when the head support device 9 is used, the head support device 9 is designed so that the position of the center of gravity of the portion held by the plate spring portion 4, for example, when the coil 3 and the coil holder 8 are rotated by the VCM, coincides with the intersection of the rotation axis of the magnetic recording medium 12 of the support arm 2 in the radial direction and the rotation axis perpendicular to the recording surface direction of the magnetic recording medium 12, that is, the midpoint (point P shown in fig. 6) of the line connecting the top contact points of the support arm 2 and the spindle bearing 11 is substantially the same position, and thus, a stable head support device with less vibration corresponding to external impact or the like can be provided.

At this time, a head supporting device having the maximum impact resistance can be provided, but there is no problem even if there is a slight deviation in practical use.

Hereinafter, an apparatus for retracting the magnetic head in the magnetic disk apparatus of the present embodiment and its operation will be described.

In fig. 6 and 7, a CSS region 16 is provided in a predetermined region of the inner periphery of the magnetic recording medium 12 to retract the slider 1 provided at one end of the support arm 2.

The CSS region 16 is roughened compared with the region other than the CSS region 16 where magnetic recording is possible, so that the slider 1 or the magnetic head and the magnetic recording medium 12 are less likely to be attracted.

When the rotation of the magnetic recording medium 12 is stopped, the end of the support arm 2 where the slider 1 is provided is rotated toward the inside of the magnetic recording medium 12, and when the slider 1 provided at the end of the support arm 2 is rotated and lowered by the magnetic recording medium 12, the air flow reduces the buoyancy and is lowered, and finally the slider 1 comes into contact with the magnetic recording medium 12 in the CSS region 16, and stops in this state.

As shown in fig. 7, in the head supporting device 9 of the magnetic disk device 23 of the present invention, the coil 3 is sandwiched between the upper yoke 19 and the magnet 20 in the vertical direction. As shown in fig. 9, a plate spring member 31 is disposed as a pressing means on the upper yoke 19. The plate spring member 31 may be made of a metal having good slidability, for example, stainless steel such as SUS420J 2.

The spring coefficient of the plate spring member 31 is set as low as possible, and variations in the load applied to the support arm due to variations in the relative positions of the components during manufacturing are minimized.

As shown in fig. 9, an upper yoke 19 having escape holes 19a is provided on the upper portion of the coil holder 8, and the top portion 8a provided on the coil holder 8 is configured to rotate between the escape holes 19 a.

Further, the plate spring member 31 is attached to the upper yoke 19 so as to cover the escape hole 19a, and one end thereof is fixed to the upper yoke 19, and the other end of the plate spring member 31 is movable up and down in a direction perpendicular to the magnetic recording medium 12 by its elastic force.

With this configuration, the supporting arm 2 is rotated radially inward of the magnetic recording medium 12, and when the slider 1 is retracted into the CSS region 16, the plate spring member 31 as the urging means urges the top portion 8a of the coil holder 8 in a direction approaching the magnetic recording medium 12, whereby the frictional force between the slider 1 or the magnetic head and the magnetic recording medium 12 can be reduced, and therefore, the load applied to the spindle motor 30 when the magnetic recording medium 12 is rotated can be reduced at the time of starting the magnetic disk apparatus 23.

A mechanism for reducing the load applied to the spindle motor 30 will be described in more detail with reference to fig. 10. Fig. 10 is a schematic diagram showing a positional relationship between the other end side (coil 3 and coil yoke 8 in the drawing) of the head supporting device 9, the upper yoke 19, the plate spring member 31, and the magnet 20 when the magnetic disk device 23 is operated or stopped.

As shown in fig. 10, the plate spring member 31 as the urging means is held by the upper yoke 19, and while the magnetic recording medium 12 is rotating, that is, in a state where the magnetic head is loaded on the magnetic recording medium 12, the head supporting means 9 is rotated in a state separated from the plate spring member 31 as shown in fig. 10 (a).

Next, when the rotation of the magnetic recording medium 12 is stopped, that is, when the magnetic head is retracted, the supporting arm 2 is rotated in the radial direction of the magnetic recording medium 12, one end of the supporting arm 2 on which the slider 1 is mounted is rotated toward the inside of the magnetic recording medium 12 as described above, the other end side of the magnetic head supporting device 9 including the coil support 8 shown in fig. 10(a) is rotated toward the right of the paper surface to be in a state shown in fig. 10(B), and the top 8a of the coil support 8 is brought into contact with the plate spring member 31.

Further, almost at the same time as the slider 1 provided at one end of the support arm 2 enters the CSS region 16, the top portion 8a of the coil holder 8 is pressed by the plate spring part 31.

Further, as the supporting arm 2 rotates, the magnetic head supporting device 9 is pressed in the direction of the magnet 20 side by the elastic force of the leaf spring member 31 as shown in fig. 10 (C). At this time, the distance between the upper yoke 19 and the coil support 8 is not changed from the distance shown in fig. 10 (a).

In the magnetic disk device 23 of the present invention, the slider 1 in this state is held in contact with the CSS region 16 when it is stopped, and a biasing force in a direction away from the magnetic recording medium 12 is applied to one end of the support arm 2 where the slider 1 is formed, so that the frictional force between the slider 1 or the magnetic head and the magnetic recording medium 12 is reduced, and the slider 1 or the magnetic head and the magnetic recording medium 12 are less likely to be attracted to each other, and therefore the torque required to be applied to the spindle motor 30 when it is started can be significantly reduced as compared with the conventional one.

Thus, since the torque required for the spindle motor 30 can be reduced, even when the entire magnetic disk device 23 is downsized, the spindle motor 30 can partially satisfy the required torque and can be downsized, and the entire magnetic disk device 23 can be downsized and thinned.

In addition, in the disk device of the present invention, the outer dimensions of the case are the same as those of the SD memory card. The dimensions shown in FIG. 6 and FIG. 7 are 32mm in length (L), 24mm in width (W) and 2.1mm in height (H), and in FIG. 6, the chamfered portion C is formed in a shape chamfered by 4 mmC.

In addition, the chamfered portion C may be provided on the side opposite to the diagonal line forming the bearing portion 10 side of the support arm 2 (as shown in the upper left portion of fig. 6).

In addition, by designing the disk device 23 in this way, it is possible to realize a design in which the elastic force of the plate spring member 31 is the same as or smaller than the load applied to the support arm 2 by the plate spring portion 4.

With this design, the sliding load between the magnetic head or the slider 1 and the magnetic recording medium 12 can be made extremely small, and the load on the spindle motor 30 at the time of starting can be further reduced, so that the magnetic disk device 23 can be made smaller and thinner with higher efficiency.

In the present embodiment, the case where the plate spring member 31 is formed on the upper yoke 19 is shown, but it is needless to say that the plate spring member 31 is formed on the frame 15, and the same effect is produced.

Further, by adopting the structure of the plate spring member 31 shown in this embodiment, the impact when the coil holder 8 comes into contact with the plate spring member 31 can be alleviated.

Further, in the conventional magnetic head supporting apparatus of the load/unload method, when the magnetic head is in the unloaded state to the loaded state or in the loaded state to the unloaded state, a problem that the slider 1 gives mechanical or magnetic damage to the magnetic recording medium 12 hardly occurs.

Further, the pressing means may be constituted by performing surface treatment such as plating with a fluororesin or a DLC (diamond like carbon) film on the plate spring member 31 by using a material having good sliding properties, thereby realizing a low friction coefficient.

With this configuration, the load on the spindle motor 30 at the time of starting can be further reduced.

In the present embodiment, the CSS region 16 is provided in the inner peripheral portion of the magnetic recording medium 12. However, even when the CSS region 16 is provided in the outer peripheral portion of the magnetic recording medium 12, it is needless to say that the plate spring member 31 as the urging means of the present invention is formed on the left side of the head supporting device 9 facing the paper as shown in fig. 6, and completely similar effects can be obtained.

In the present embodiment, the configuration of the magnetic disk apparatus provided with one head supporting device 9 has been described, but the disk apparatus of the present invention is not limited to this, and a configuration provided with a plurality of head supporting devices 9, for example, a configuration in which the head supporting devices 9 are formed on both sides of the magnetic recording medium 12 having recording surfaces formed on both sides, is of course possible.

In the present embodiment, the configuration in which the pressing device is provided in the head support device 9 mounted on the magnetic disk device 23 has been described, but the disk device of the present invention is not limited to this, and a configuration in which the pressing device is not provided may be adopted.

In the present embodiment, the magnetic disk device 23 is a CSS type magnetic disk device, and the pressing force is reduced by the pressing device when the mounted head supporting device enters the CSS region, but the disk device of the present invention is not limited to the CSS type, and is also applicable to, for example, an L/UL type disk device.

Further, the slider 1 may be separated from the recording medium by pressing the head supporting device with a pressing device.

In addition, although the magnetic disk device using the magnetic head has been described in the embodiments of the present invention, the disk device of the present invention has the same effect as that of a non-contact type disk recording and reproducing device, for example, an optical disk device, and the like.

Claims

1. A disk device, comprising:

a recording medium;

a support arm;

the working head is arranged below one end of the supporting arm;

a bearing portion for rotating the support arm in a radial direction of the recording medium;

an elastic means connected to the support arm for applying a biasing force to the support arm in a direction approaching the recording surface of the recording medium;

a driving device for rotating the supporting arm in the radial direction of the recording medium; and

a pressing device attached to the drive device, the pressing device being capable of reducing the pressing force applied to the support arm by the elastic device when the support arm is rotated in the radial direction of the recording medium and retreated to a predetermined region on the recording surface of the recording medium under the condition that the working head is kept in contact with the recording surface,

the support arm is rotatable in a radial direction of the recording medium with the bearing portion as a rotation center, and is rotatable in a direction perpendicular to the recording surface of the recording medium with a point of connection between a top of the bearing and the support arm as a fulcrum with a pivot bearing connected to the support arm and having a pair of tops as a rotation center.

2. The disk drive apparatus according to claim 1, wherein said urging means comprises a leaf spring disposed on the other end side of said support arm and configured to press said other end side of said support arm when said working head is retracted.

3. Disc apparatus according to claim 1 or 2, wherein said urging means reduces the force to be applied to said support arm to be equal to or less than said pressing force.

4. A disk apparatus according to claim 1 or 2, wherein said drive means is operated by means of a voice coil provided on said support arm.

5. A disk apparatus according to claim 1 or 2, wherein said elastic means is constituted by a plate spring portion provided between said bearing portion and said support arm.

6. The disk apparatus of claim 1 or 2, wherein said working head is supported by a slider provided on said supporting arm.

7. The disk apparatus of claim 6, further comprising a gimbal mechanism provided on the support arm for supporting the slider freely movable in the pitch and yaw directions.

8. The disc device according to claim 1 or 2, wherein the center of gravity of the support arm held by the elastic means is located at an intersection of a rotation axis of the support arm in a radial direction of the recording medium and a rotation axis perpendicular to the recording surface direction of the recording medium.