JP2000187952A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To embody the maximum curtailment of the mass of a head actuator. SOLUTION: The magnetic disk device has a magnetic head and the head actuator 4 for tracking the magnetic head on a magnetic disk. The head actuator 4 has a turning fulcrum shaft 7 planted to the head actuator 4. The magnetic disk device has a first bearing part 5a and second bearing part 5b for turnably holding the head actuator 4. The first bearing part 5a is fixed into the chassis of the magnetic disk device. The magnetic disk device further has plural supporting members 10 which are planted onto the chassis and freely directly actively support the second bearing part 5b in the axial direction of the turning fulcrum shaft 7 and a coupling part 11 for coupling the second bearing part 56 and the supporting members 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive used as a storage device of a computer.

[0002]

2. Description of the Related Art In recent years, with the spread of personal computers and communication networks, magnetic disk devices have been actively used as indispensable equipment items for use in personal computers and for server applications. The recording density is increasing at an annual rate of 60%,
There is also a strong demand for faster recording and playback speeds.

A conventional magnetic disk drive will be described below.

FIG. 15 is a perspective view of a conventional magnetic disk drive. FIG. 16 is a longitudinal sectional view of a main part of a conventional magnetic disk drive. FIG. 17 is a plan view of a main part of a conventional magnetic disk drive.
A magnetic disk drive generally includes a magnetic disk 2 rotated by a spindle motor 1 as shown in FIGS. 15 and 16, a magnetic head 3 for recording / reproducing data on a predetermined track of the magnetic disk 2, and a magnetic head 3 for the magnetic disk. A head actuator 14 for mounting the head 3 at the tip is provided. Generally, a plurality of magnetic disks 2 and magnetic heads 3 are provided to increase the recording capacity.

The magnetic head 3 has a head actuator 14
Are elastically supported by the magnetic head supporting member 14a constituting the above so as to allow the posture change.

The head actuator 14 generally has a pivot bearing member 15 composed of two ball bearings connected in series, and the pivot bearing member 15 of the magnetic disk drive is arranged so that the head actuator 14 can rotate. It is supported on a rotating support shaft 17 erected on the chassis body 16.

As the pivot bearing member 15, a custom-made unit having a configuration in which a preload is already applied is often used. This is because it is necessary to match the shape of the pivot bearing member 15 with the shape of the head actuator 14.

As a driving source of the head actuator 14, a flat coil portion 14b is disposed on the opposite side of the mounting position of the magnetic head 3 with respect to the rotation support shaft 17, and a magnet member is attached to the chassis body 16 in opposition thereto. It is a general configuration to adopt a voice coil motor system in which 19 is provided. This is controlled together with the spindle motor 1 by drive control means (not shown).

The operation of the conventional magnetic disk drive configured as described above will be described below.

First, the magnetic disk 2 is driven to rotate by the spindle motor 1. In this state, the head actuator 14 is driven to rotate around the rotation support shaft 17 so that the magnetic head 3
Is moved in the radial direction of the recording surface of the magnetic disk 2. At this time, data recorded on the magnetic disk 2 is read by the magnetic head 3, and after information processing, the position information is sent to drive control means (not shown), and the drive control means drives the head actuator 14 to rotate. The magnetic head 3 is positioned at a predetermined position by the electromagnetic induction generated by the flat coil portion 18 and the magnet member 19. Therefore, the magnetic head 3 records and reproduces information.

[0011]

However, in the above-described conventional configuration, a large pivot bearing member 15 having a mass exceeding 40% of the total mass of the head actuator 14 is mounted on the head actuator 14 as shown in FIG. As shown in (1), the access scanning of the magnetic head is performed (in the direction of the arrow), and therefore, in order to further reduce and speed up the access scanning expected in the future, a stable servo drive control of the magnetic head positioning is required. From the viewpoint of securing conditions, reducing the mass of the head actuator 14 has become a major issue.

In order to improve the control characteristics, the rotational moment of inertia is reduced, that is, the distance L10 between the center of the magnetic disk 2 and the rotational support shaft 17 as shown in FIG.
It is also necessary to shorten the length L20 (illustration) from the center of the rotation support shaft 17 of the head actuator 14 to the tip of the magnetic head 3 (illustration).

Further, the internal temperature of the magnetic disk device is further increased due to the further generation of heat from the flat coil portion 14b with the increase in the speed of the access scanning. There was a problem that it became.

[0014] These are major technical issues for responding to the high density and high speed of the recording / reproducing performance of the magnetic disk device which are strongly demanded from the market. However, increasing the power consumption in a straightforward manner and improving the stability of the control characteristics is against the advance of technology even if judged from the aspect of environmental issues.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide a magnetic disk drive capable of realizing further narrowing and speeding-up of access scanning of a magnetic head and lowering power consumption of access scanning drive. Aim.

[0016]

A magnetic disk drive according to the present invention is a magnetic disk drive having a magnetic head and a head actuator for tracking the magnetic head on a magnetic disk.
Having a pivot supported on the head actuator,
The magnetic disk drive includes a first bearing portion and a second bearing portion for rotatably holding the head actuator.
A bearing portion is fixed on a chassis of the magnetic disk device, and the magnetic disk device is mounted on the chassis and supports the second bearing portion so as to be linearly movable in the axial direction of the rotation support shaft. And a connecting portion for connecting the second bearing portion and the supporting member, thereby achieving the above object.

The joint may include an anaerobic adhesive member or an ultraviolet-curable adhesive member.

[0018] The connecting portion may include a fastening member.

The first bearing portion includes a ball bearing having an outer ring fixed to the chassis and an inner ring fitted to the pivot, and the second bearing portion has an outer ring fixed to the second bearing portion. The inner race may include a ball bearing fitted to the pivot.

Another disk drive according to the present invention is a magnetic disk drive comprising a magnetic head and a head actuator for tracking the magnetic head on a magnetic disk, wherein the head actuator is set on the head actuator. The magnetic disk drive has a first bearing portion and a second bearing portion that rotatably hold the head actuator, and the first bearing portion is provided on the magnetic disk device. The head actuator is fixed on a chassis, and the head actuator further has a coil portion provided on a side opposite to the magnetic head with respect to the rotation support shaft. A second magnet provided on the side opposite to the chassis with respect to the coil portion; More the above-mentioned object can be achieved.

The head actuator and the rotation support shaft may be formed integrally.

The first bearing portion includes a ball bearing having an outer ring fixed to the chassis and an inner ring fitted to the pivot. The second bearing portion has an outer ring fixed to the second bearing portion. The inner race may include a ball bearing fitted to the pivot.

Still another magnetic disk drive according to the present invention is a magnetic disk drive having a magnetic head and a head actuator for tracking the magnetic head on a magnetic disk, wherein the head actuator holds the magnetic head. A head arm section, a coil section for generating a rotational driving force for rotationally driving the head actuator, and a rotational support shaft section having a rotational axis of the head actuator. And a heat radiating means for radiating heat generated by the coil portion, thereby achieving the above object.

The heat dissipating means may have a fin-shaped portion.

[0025] The rotation support shaft may be fitted and fixed to the head arm and the coil.

[0026] The rotation support shaft may include a laser welded portion connecting the rotation support shaft, the head arm, and the coil.

[0027]

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a main part of a magnetic disk drive according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a part of FIG. FIG. 3 is a perspective view of a magnetic disk drive according to Embodiment 1 of the present invention.

1, 2 and 3, reference numeral 1 denotes a spindle motor for rotating the magnetic disk 2, and it is preferable to use a DC brushless motor from the viewpoint of high rotation accuracy and long life reliability. Reference numeral 3 denotes a magnetic head for recording and reproducing data on a predetermined track on the magnetic disk 2. Reference numeral 4 denotes a head actuator for mounting the magnetic head 3 at the tip thereof. As a basic material, it is preferable to use an aluminum alloy that is lightweight and can be expected to have high rigidity. Reference numeral 7 denotes a pivot supported on the head actuator 4, and a stainless steel shaft is preferable because accuracy can be relatively easily secured.

Reference numeral 5a denotes a pivot bearing lower member which rotatably supports the head actuator 4, and a ball bearing is fixed to the chassis body 6 of the magnetic disk drive by an outer ring. This ball bearing does not need to be a special order product, but may be a commercially available general-purpose standard part. As for the fixing method, a light press-fitting method or a bonding method is preferable from the viewpoint of assembling accuracy and preventing a harmful external force from being applied to the bearing ball portion. Reference numeral 5b denotes a pivot bearing upper member that rotatably supports the head actuator 4, and is composed of a ball bearing 5c fixed by an outer ring and a bearing support member 5d, like the pivot bearing lower member 5a. In order to ensure the positioning accuracy, it is necessary to apply a suitable preload to each ball bearing to suppress play in the radial direction and the thrust direction.

Reference numeral 10 denotes a pin erected on the chassis body 6, and the fixing method may be a press-fitting method. In the present embodiment, two are provided. The material may be a commercially available general-purpose standard part made of stainless steel.

As shown in FIG. 2, a bearing supporting member 5d of a pivot bearing upper member 5b is fitted to these pins 10 so as to be able to move linearly, and a weight (not shown) corresponding to an appropriate preload is applied to the pivot bearing. In a state where a preload is applied in the W direction shown in FIG. 1 by placing it on the member 5b, for example, the preload biasing force of the weight is applied from above to the outer ring of the ball bearing 5c of the pivot bearing upper member 5b and the bearing of the ball bearing 5c. The ball, the inner ring of the ball bearing 5c, the head actuator 4, the ball bearing inner ring of the lower pivot bearing member 5a through the rotary support shaft 7, the ball bearing bearing ball, the ball bearing outer ring, and the chassis body 6 of the magnetic disk drive. 2 and the pin 10 and the pivot as shown in FIG. Are provided an adhesive member 11 (shown 4 places) to couple the bearing support member 5d bets bearing upper member 5b.

Thus, the clearance (play) of each ball bearing is regulated, and positioning accuracy is ensured. As the bonding member 11, an anaerobic adhesive or an ultraviolet-curing adhesive that has a short bonding time, a small change in shape such as shrinkage of the bonding portion, and a small generation of outgas is suitable.

In the above description, the bonding members 11 are provided at four positions as a member for connecting the pin 10 and the bearing support member 5d of the pivot bearing upper member 5b. May be reduced.

As shown in FIGS. 4 and 5, the pin 10 and the bearing support member 5d of the upper pivot bearing member 5b may be connected by fastening means using screws 12 or welding 13. As a result, it is possible to avoid the specificity of the work, and it is possible to adopt a very general assembly method using general-purpose standard parts and general-purpose tools.

Numeral 8 designates a flat coil portion of a voice coil motor block for rotating the magnetic head 3 on the head actuator 4 to a predetermined track. It is located on the opposite side of the mounting location. The material is a polyurethane copper wire or the like.

Numeral 9 denotes a magnet member which is arranged and fixed on the chassis main body 6 so as to face the flat coil portion 8 and secure a predetermined gap. The magnet member 9 is driven and controlled by a voice coil motor drive circuit (not shown). The head actuator 4 is driven by the electromagnetic induction generated together with the flat coil portion 8.
Is driven to rotate. The magnet member 9 has a practical configuration in which a metal magnet material having a high coercive force such as a rare earth element is laminated on an iron plate as a yoke.

The operation of the magnetic disk device configured as described above will be described.

First, the magnetic disk 2 is driven to rotate by the spindle motor 1. In this state, the head actuator 4 is rotated around the rotation support shaft 7 to move the magnetic head 3 in the radial direction of the recording surface of the magnetic disk 2. At this time, data recorded on the magnetic disk 2 is read by the magnetic head 3, and after information processing, the position information is sent to drive control means (not shown), and the drive control means drives the head actuator 4 to rotate. The magnetic head 3 is positioned at a predetermined position by the electromagnetic induction generated by the flat coil portion 8 and the magnet member 9. Therefore, the magnetic head 3 records and reproduces information.

As described above, according to the first embodiment, the head actuator 4 for positioning the magnetic head 3,
The rotating shaft 7 mounted on the head actuator 4 is fixed to the chassis main body 6 of the magnetic disk drive by an outer ring so that the head actuator 4 can be rotatably supported at the lower end of the rotating shaft 7. And a pivot bearing upper member 5b composed of a ball bearing fixed by an outer ring so that the head actuator 4 can be rotatably supported at the upper end of the pivot. The upper pivot bearing member 5b is connected to the chassis body 6 of the magnetic disk drive.
The plurality of pins 10 implanted thereon are supported so as to be able to move directly in the axial direction of the rotation support shaft 7, and the lower end of the rotation support shaft 7 and the inner ring of the pivot bearing lower member 5a are fitted. It is commercially available by adopting a configuration in which an upper end portion of the rotation support shaft 7 and an inner ring of the pivot bearing upper member 5b are fitted to each other, and an adhesive member 11 for connecting the pivot bearing upper member 5b and the pin 10 is provided. There are general purpose inexpensive ball bearings available.

Further, a pivot bearing member having a large mass exceeding 40% of the total mass (about 20 g) of the head actuator can be excluded from the objects to be rotationally driven.

Further, since there is no need for a storage space for a pivot bearing member having a large volume as shown in FIG. 11 of the conventional example, and a very slim shaft form having only a rotating support shaft is used, the magnetic structure shown in FIG. The distance L1 (shown) between the center of the disk 2 and the pivot 7 and the length L2 from the center of the pivot 7 of the head actuator 4 to the tip of the magnetic head 3
(Shown) can be shortened as compared with conventional L10 and L20 (see FIG. 17). That is, it is possible to bring the position of the rotation support shaft 7 closer to the magnetic disk 2.

Further, since the bearing span between the pivot bearing members can be set larger than in the conventional example, the fluctuation of the runout of the head actuator can be suppressed.

Furthermore, it is necessary to adopt a configuration in which an appropriate preload is applied to the ball bearing in order to suppress play in the radial direction and the thrust direction. However, the pivot bearing member is not disposed on a movable body such as the head actuator 4. Since it is arranged on the chassis main body 6, the preload applying configuration can be realized with a stable and simple structure.

Thus, it is possible to reduce the weight of the head actuator and thereby increase the resonance frequency band, and it is advantageous in that the voice coil motor drive control can be easily performed for narrowing and speeding up the access scanning of the magnetic head. Conditions can be provided, and in addition, it is possible to contribute to lower power consumption of the access scanning drive.

(Embodiment 2) FIG. 7 is a longitudinal sectional view of a main part of a magnetic disk drive according to Embodiment 2 of the present invention.
FIG. 8 is an enlarged longitudinal sectional view of a main part of the magnetic disk device in which a part of FIG. 7 is enlarged, and FIG. 9 is a perspective view of the magnetic disk device according to the second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and the description will be partially simplified.

7, 8 and 9, 1 is a spindle motor for rotating the magnetic disk 2, 3 is a magnetic head, 4 is a head actuator,
Reference numeral 7 denotes a pivot shaft mounted on the head actuator 4, 5a denotes a pivot bearing lower member that rotatably supports the head actuator 4, and 5e denotes a pivot bearing that rotatably supports the head actuator 4. The upper member is composed of a ball bearing 5c and a bearing support member 5f.

In order to ensure the positioning accuracy, it is necessary to apply a suitable preload to each of the ball bearings to suppress the play in the radial and thrust directions.

Numeral 8 denotes a flat coil portion of a voice coil motor block for rotating the magnetic head 3 to a predetermined track. 9g is a flat coil portion which faces the flat coil portion 8 and secures a predetermined gap. The lower part 9g is a magnet lower member 9g composed of an iron plate 9f and a magnet 9b disposed and fixed on the chassis main body 6, and 9e is opposed to the flat coil part 8 and secures a predetermined gap to secure the flat coil part. 8 is an upper magnet member composed of an iron plate 9 d and a magnet 9 a disposed above the upper surface 8. The above is the same as the configuration of the first embodiment (FIGS. 1 to 5).

The difference from the structure of the first embodiment is that the pivot bearing upper member 5e is integrally formed with the magnet upper member 9e as shown in FIG. The upper magnet member 9e is disposed on the chassis main body 6 by a pair of support members 9c (two places). As shown in FIG. Magnet 9b of magnet lower member 9g
Either the magnet upper member 9a or the support member 9c is made of an iron plate so that the attractive magnetic force acting in the F direction generated between them applies to the ball bearings of the pivot bearing upper member 5e and the pivot bearing lower member 5a as appropriate preload biasing force. 9d is fixed away from.

The description of the operation of the magnetic disk device configured as described above is the same as that of the first embodiment, and will not be repeated.

According to the above embodiment, the head actuator 4 for positioning the magnetic head 3, the flat coil portion 8 of the voice coil motor block for rotating the magnetic head 3 to a predetermined track, and the flat coil At the lower side of the flat coil portion 8 while securing a predetermined gap opposing the portion 8, a magnet lower member 9 g composed of an iron plate 9 f and a magnet 9 b disposed and fixed on the chassis main body 6 and a flat coil portion 8. A magnet upper member 9e comprising an iron plate 9d and a magnet 9a disposed above the flat coil portion 8 while securing a predetermined gap therebetween;
And a ball bearing fixed on an outer ring on a chassis body 6 of the magnetic disk drive so that the head actuator 4 can be rotatably supported at the lower end of the rotation support shaft 7. And a pivot bearing upper member 5e composed of a ball bearing fixed on an upper magnet member 9e by an outer ring so that the head actuator 4 can be rotatably supported at the upper end of the rotation support shaft. With this configuration, a commercially available inexpensive general-purpose ball bearing can be used, and a pivot bearing member having a large mass exceeding 40% of the total mass (about 20 g) of the head actuator can be used. It can be excluded from dynamic drive targets.

In addition, since a storage space for a pivot bearing member having a large volume as shown in FIG. 16 of the conventional example is not required, and a very slim shaft form including only a rotating support shaft is provided, a magnetic field as shown in FIG. The distance L1 (shown) between the center of the disk 2 and the pivot 7 and the length L2 from the center of the pivot 7 of the head actuator 4 to the tip of the magnetic head 3
(Shown) can be shortened as compared with conventional L10 and L20 (see FIG. 17). That is, it is possible to bring the position of the rotation support shaft 7 closer to the magnetic disk 2.

Furthermore, since the bearing span between the pivot bearing members can be set larger than in the conventional example, fluctuations in the runout of the head actuator can be suppressed.

Furthermore, it is necessary to adopt a configuration in which an appropriate preload is applied to the ball bearing in order to suppress play in the radial direction and the thrust direction. However, the pivot bearing member is not disposed on the movable body of the head actuator 4. Further, a revolutionary preload applying configuration in which the attractive magnetic force of the magnet portion of the voice coil motor block can be effectively used for preload biasing can be realized with a stable and simple configuration.

Thus, it is possible to reduce the weight of the head actuator and thereby increase the resonance frequency band, and it is advantageous in that the drive control of the voice coil motor is easily performed with respect to narrowing and speeding up the access scanning of the magnetic head. Conditions can be provided, and in addition, it is possible to contribute to lower power consumption of the access scanning drive.

In the above description, the reference numeral 7 designates a pivot supported on the head actuator 4, but a pivot support may be integrally provided on the head actuator 4. If the center of the pivot shaft is properly robbed for further weight reduction, better performance can be expected. It is considered that a satisfactory configuration in terms of accuracy and rigidity can be obtained depending on the shape design conditions.

(Embodiment 3) FIG. 10 is a perspective view of a magnetic disk drive according to Embodiment 3 of the present invention.
FIG. 1 is a longitudinal sectional view of a main part of a magnetic disk drive according to Embodiment 3 of the present invention, FIG. 12 is a perspective assembly view of a head actuator peripheral portion in Embodiment 3 of the present invention, and FIG. FIG. 3 is a perspective component diagram illustrating components around a head actuator. The same elements as those described in the first embodiment are denoted by the same reference numerals. A detailed description of these will be omitted.

In FIGS. 10 to 13, reference numeral 1 denotes a spindle motor for driving the magnetic disk 2 to rotate, and it is preferable to use a DC brushless motor in terms of high rotation accuracy and high life reliability. Reference numeral 3 denotes a magnetic head for recording and reproducing data on a predetermined track on the magnetic disk 2. Numeral 34 denotes a head actuator for mounting the magnetic head 3 at its tip. Numeral 34a denotes a magnetic head support member constituting the head actuator 34, which can follow a change in the attitude of the magnetic head 3 which fluctuates sequentially due to an air flow generated by rotation of the magnetic disk 2 during recording / reproducing, and secure a stable state. The magnetic head 3 is elastically supported. The magnetic head 3 is formed by a sheet metal bending part made of a thin metal plate having a high elasticity in terms of accuracy, durability, and workability, and the magnetic head 3 is fixed to one end by an adhesive method.

Numeral 34b denotes a head arm member which constitutes the head actuator 34 and fixes the magnetic head support member 34a at one end. The material is lightweight, high rigidity can be expected, heat radiation is good, and very simple press working is performed. And the like are preferred.

A plurality of magnetic disks 2, magnetic heads 3, magnetic head support members 34a and head arm members 34b are provided to increase the recording capacity.

Reference numeral 34c denotes a rotation support shaft member which constitutes the head actuator 34 and forms a rotation axis of the head actuator 34. As the material, an aluminum-based material having a large heat radiation effect is suitable similarly to the head arm member 34b. Further, it has a fin-shaped portion for increasing the surface area for the purpose of improving the heat radiation effect. Reference numeral 34e denotes an upper portion of the support shaft of the rotation support member 34c, and reference numeral 34f denotes a lower portion of the support shaft.

Reference numerals 5a and 5b denote a pair of upper and lower bearing members rotatably supporting the head actuator 34, which are fixed to the chassis main body 6 of the magnetic disk drive, and respectively hold an upper support shaft 34e and a lower support shaft 34f. are doing. As the type of the bearing, a ball bearing is most suitable, and as for the fixing method, a light press-fitting method or a bonding method is preferable from the viewpoint of assembling accuracy and preventing a harmful external force from being applied to the bearing ball portion. Although a detailed description is omitted, it is better to adopt a configuration in which an appropriate preload is applied to each ball bearing to suppress play in the radial direction and the thrust direction in order to secure positioning accuracy.

Reference numeral 34d designates a head actuator 34, which is a flat coil member serving as a driving force generating source of a voice coil motor block for rotating the magnetic head 3 to a predetermined track, and includes a flat coil supporting member 34g and a flat coil 34h. Consists of The flat coil supporting member 34g is made of an aluminum-based plate material by press working or the like similar to the head arm member 34b, and a flat coil 34h formed by winding a polyurethane copper wire or the like is fixed by an adhesive member (not shown). I have. Reference numeral 7a denotes a magnet member which is provided on the chassis body 6 and secures predetermined gaps on the upper and lower sides facing the flat coil member 34d, and is driven and controlled by a voice coil motor drive circuit (not shown). The head actuator 34 is rotationally driven by the electromagnetic induction force generated together with the flat coil member 34d. The magnet member 7a has a practical configuration in which a metal magnet material having a high coercive force such as a rare earth element is laminated on an iron plate as a yoke.

A magnetic head supporting member 3 as shown in FIG.
4a, a head arm member 34b, a rotation support member 34c,
The flat coil member 34d is connected to form an assembly as shown in FIG. FIG. 13 shows only one magnetic head support member 34a for clarity of explanation, but it goes without saying that the number corresponds to the number of head arm members 34b. Although only two head arm members 34b are shown for the same reason, the amount may be increased according to the recording capacity.

Further, a fin-shaped portion capable of providing a plurality of head arm members 34b is formed on the rotation support shaft member 34c, and a necessary number of head arm members 34b are provided to share components.・ Standardization can be achieved. When the head arm member 34b and the flat coil member 34d are fitted and connected to the fin-shaped portion of the rotation support member 34c, some clearances 34i are provided in the fitting direction as shown in the drawing.
Is fixed, the surface area of the assembly is further increased, and the heat radiation effect is further improved.

The operation of the magnetic disk drive configured as described above will be described.

First, the magnetic disk 2 is driven to rotate by the spindle motor 1. In this state, the head actuator 34 is driven to rotate about the axis of the rotation support member 34c, that is, the magnetic head 3 is moved by the electromagnetic induction force generated by the flat coil member 34d and the magnet member 7a to the radius of the recording surface of the magnetic disk 2. Move in the direction.

At this time, data recorded on the magnetic disk 2 is read by the magnetic head 3 and after information processing,
The position information is sent to drive control means (not shown), and the drive control means rotates the head actuator 34 to position the magnetic head 3 at a predetermined position. Therefore, the magnetic head 3 records and reproduces information.

As described above, according to the third embodiment, the mass of the head actuator can be greatly reduced, and a simple and lightweight head actuator having excellent heat radiation characteristics can be formed. Stability is improved, narrowing and high-speed access scanning of the magnetic head are realized under low power consumption conditions, and a head actuator with high cost performance and high reliability can be provided.

(Embodiment 4) FIG. 14 is an enlarged cross-sectional view of a main part around a head actuator according to Embodiment 4 showing a part of FIG. 11 in an enlarged manner. The same components as those in the third embodiment are denoted by the same reference numerals, and the description is partially omitted.

Numeral 34 denotes a head actuator for mounting the magnetic head 3 at the tip thereof. Numeral 34a denotes a magnetic head supporting member constituting the head actuator 34,
Reference numeral 4b denotes a head arm member that constitutes the head actuator 34 and fixes the magnetic head support member 34a at one end. The magnetic disk 2, the magnetic head 3, the magnetic head support member 34a, and the head arm member 34b are used to increase the recording capacity. A plurality is provided.

Reference numeral 34c denotes a rotation support shaft member which constitutes the head actuator 34 and forms a rotation axis of the head actuator 34. As the material, an aluminum-based material having a large heat radiation effect is suitable similarly to the head arm member 34b. Further, it has a fin-shaped portion for increasing the surface area for the purpose of improving the heat radiation effect. Reference numeral 34e denotes an upper portion of the support shaft of the rotation support member 34c, and reference numeral 34f denotes a lower portion of the support shaft.

Reference numerals 5a and 5b denote a pair of upper and lower bearing members rotatably supporting the head actuator 34, which are fixed to the chassis main body 6 of the magnetic disk drive, and which respectively hold a support shaft upper portion 34e and a support shaft lower portion 34f. are doing.

Reference numeral 34d designates a head actuator 34, which is a flat coil member serving as a driving force generating source of a voice coil motor block for rotating the magnetic head 3 to a predetermined track, and includes a flat coil supporting member 34g and a flat coil 34h. Consists of

Reference numeral 7a denotes a magnet member which is provided on the chassis body 6 and secures predetermined gaps on the upper and lower sides facing the flat coil member 34d, and is controlled by a voice coil motor drive circuit (not shown). Then, the head actuator 34 is rotationally driven by the generated electromagnetic induction force together with the flat coil member 34d. The magnet member 7a has a practical configuration in which a metal magnet material having a high coercive force such as a rare earth element is laminated on an iron plate as a yoke. The above is the same as the configuration of the third embodiment (FIGS. 10 to 13).

FIG. 14 is different from the structure of the third embodiment.
As shown in the figure, the head arm member 34b and the flat coil member 34d are
The point is that they are fitted with high precision without rattling and are further fixed by a laser welding method. The laser weld 8 is indicated by several circles. According to the laser welding method, it is possible to realize processing without harmful dust such as processing powder and harmful deformation of parts without using auxiliary materials in a short time.

The description of the operation of the magnetic disk device configured as described above is the same as that of the third embodiment and will not be repeated.

As described above, according to the third embodiment, by providing the laser welding portion for connecting the rotating support shaft member 34c, the head arm member 34b, and the flat coil member 34d, the working time can be extremely reduced. There is no generation of harmful dust such as processing powder, no harmful deformation of parts,
In addition to adopting a method of joining parts with high mass production stability that can reduce the cost of processing, the mass of the head actuator can be significantly reduced, and a simple, lightweight, and excellent heat radiation characteristic head actuator can be configured. As a result, the stability of the drive control of the head actuator is improved, the access scan of the magnetic head can be narrowed and speeded up under low power consumption conditions, and a head actuator with high cost performance and high reliability can be provided. .

The present invention is not limited to the above-described first to fourth embodiments.
It is needless to say that various modifications can be made without departing from the scope of the present invention.

[0080]

As described above, according to the present invention, the mass of the head actuator can be significantly reduced, and the magnetic head can be moved from the center-to-center distance between the magnetic disk and the rotating shaft or the center of the rotating shaft of the head actuator. The length to the tip can be easily reduced, and the preload applying configuration can be realized with a stable and simple structure.

In addition, since the bearing span of the pivot bearing portion can be set to be large, the fluctuation of the vibration of the head actuator can be suppressed, and a stable access scanning drive capable of preventing self-resonance can be realized.

Further, by forming the rotation support shaft integrally with the head actuator, it contributes to rationalization of the number of assembling steps and material costs, and further reduction of mass can be achieved.

Further, it is possible to realize a highly reliable head actuator which is excellent in heat radiation characteristics and operates with low power consumption at a lower cost as compared with the conventional one. There is no generation of harmful dust and no harmful deformation of parts.
The production cost can be reduced, and a component joining method with high mass production stability can be adopted.

Thus, it is possible to provide advantageous conditions in which the drive control of the voice coil motor for coping with narrowing and high-speed access scanning of the magnetic head can be provided. In addition, it also contributes to lower power consumption of the access scanning drive. The excellent effect that can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a magnetic disk drive according to a first embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the magnetic disk drive according to the first embodiment of the present invention.

FIG. 3 is a perspective view of the magnetic disk drive according to the first embodiment of the present invention.

FIG. 4 is an enlarged longitudinal sectional view of a main part for explaining another configuration according to the first embodiment of the present invention.

FIG. 5 is an enlarged longitudinal sectional view of a main part for explaining still another configuration according to the first embodiment of the present invention.

FIG. 6 is a plan view of a main part of the magnetic disk drive of the present invention.

FIG. 7 is a longitudinal sectional view of a main part of a magnetic disk drive according to a second embodiment of the present invention.

FIG. 8 is an enlarged longitudinal sectional view of a main part of a magnetic disk drive according to a second embodiment of the present invention.

FIG. 9 is a perspective view of a magnetic disk drive according to a second embodiment of the present invention.

FIG. 10 is a perspective view of a magnetic disk drive according to a third embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a main part of a magnetic disk drive according to a third embodiment of the present invention.

FIG. 12 is a perspective assembly diagram of a peripheral portion of a head actuator according to a third embodiment of the present invention.

FIG. 13 is a perspective view illustrating components around a head actuator according to a third embodiment of the present invention.

FIG. 14 is an enlarged sectional view of a main part around a head actuator according to a fourth embodiment of the present invention.

FIG. 15 is a perspective view of a conventional magnetic disk drive.

FIG. 16 is a longitudinal sectional view of a main part of a conventional magnetic disk drive.

FIG. 17 is a plan view of a main part of a conventional magnetic disk drive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor 2 Magnetic disk 3 Magnetic head 4, 34 Head actuator 5a Pivot bearing lower member 5b Pivot bearing upper member 6 Chassis main body 7 Rotation support shaft 8 Flat coil part 9 Magnet member 10 Pin 11 Adhesive member 34a Magnetic head support member 34b Head arm member 34c Rotation support member 34d Flat coil member 34e Upper support shaft 34f Lower support shaft 34g Flat coil support member 34h Flat coil 34i Gap

Claims (11)

[Claims] 1. A magnetic disk drive comprising a magnetic head and a head actuator for tracking the magnetic head on a magnetic disk, wherein the head actuator has a rotating support shaft mounted on the head actuator. The magnetic disk device includes a first bearing and a second bearing that rotatably hold the head actuator, wherein the first bearing is fixed on a chassis of the magnetic disk device. The device is implanted on the chassis and the second
A magnetic disk drive further comprising: a plurality of support members for supporting a bearing portion so as to be able to move linearly in the axial direction of the rotation support shaft; and a coupling portion for coupling the second bearing portion and the support member. 2. The magnetic disk drive according to claim 1, wherein said connecting portion includes an anaerobic adhesive member or an ultraviolet-curable adhesive member. 3. The coupling part according to claim 1, wherein the coupling part includes a fastening member.
The magnetic disk device according to the above. 4. The first bearing portion includes a ball bearing in which an outer ring is fixed to the chassis and an inner ring is fitted to the rotation support shaft. The second bearing portion includes an outer ring mounted on the second bearing portion. 2. The magnetic disk drive according to claim 1, wherein the inner ring includes a ball bearing fixed to the rotation support shaft. 5. A magnetic disk drive comprising a magnetic head and a head actuator for tracking the magnetic head on a magnetic disk, wherein the head actuator has a pivot supported on the head actuator. The magnetic disk device includes a first bearing portion and a second bearing portion that rotatably hold the head actuator, the first bearing portion being fixed on a chassis of the magnetic disk device, The actuator further includes a coil portion provided on a side opposite to the magnetic head with respect to the rotation support shaft, and the magnetic disk device has a first magnet provided on the chassis side with respect to the coil portion. The magnetic disk drive further comprising: a second magnet provided on the opposite side of the coil portion to the chassis with respect to the chassis. 6. The magnetic disk drive according to claim 5, wherein said head actuator and said rotation support shaft are formed integrally. 7. The first bearing portion includes a ball bearing in which an outer ring is fixed to the chassis and an inner ring is fitted to the rotation support shaft. The second bearing portion has an outer ring formed in the second bearing portion. 6. The magnetic disk drive according to claim 5, wherein the inner ring includes a ball bearing fixed to the rotation support shaft. 8. A magnetic disk drive comprising a magnetic head and a head actuator for tracking the magnetic head on a magnetic disk, wherein the head actuator comprises: a head arm for holding the magnetic head; A coil portion for generating a rotational driving force for rotationally driving; and a rotation support shaft portion having a rotation axis of the head actuator, wherein the rotation support shaft portion radiates heat generated by the coil portion. Magnetic disk device comprising means. 9. The heat radiating means has a fin-shaped portion.
The magnetic disk drive according to claim 8. 10. The magnetic disk drive according to claim 8, wherein said rotation support shaft portion fits and fixes said head arm portion and said coil portion. 11. The magnetic disk drive according to claim 8, wherein said rotation support shaft portion has a laser welded portion connecting said rotation support shaft portion, said head arm portion and said coil portion.