JP2003187540A - Magnetic disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small sized magnetic disk device that has a plurality of magnetic head units each of which is constituted of a magnetic head, a carriage and a head driving mechanism and individually conducts recording and reproducing operations employing individual magnetic head unit. <P>SOLUTION: In the device, a plurality of carriages, into which magnetic heads and rotation coils are respectively assembled, are stacked on a same rotation shaft 9. Moreover, a magnetic circuit is provided for the device. The circuit consists of a pair of magnets, which provide d.c. magnetic field that is made orthogonal to the rotation direction of the coils being assembled into the respective carriages, and a shield case. Furthermore, the device is provided with a plurality of positioning control sections which supply individual driving currents to the plurality of coils by the positioning control signals from a head driving control section. In the above configuration, the head driving control section individually controls the rotation operations of the plurality of carriages. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having a multi-head structure equipped with a plurality of magnetic heads.

[0002]

2. Description of the Related Art The data handled with recent technological advances are
Evolution has been made from character and audio data to video data, from still image data to moving image data, and to higher definition image data (for example, high-definition images). Along with this, the amount of data processed by the recording / reproducing apparatus is increasing steadily. In other words, there are significant technical requirements for high density, large capacity, and high transfer rate in data recording / reproducing devices, and so-called hard disk recording, in which information is recorded or reproduced using a magnetic head on a magnetic disk. Also in the reproducing apparatus (hereinafter, abbreviated as HDD), many technical developments have been made for increasing the density, increasing the capacity, and increasing the transfer rate.

In the HDD, increasing the number of magnetic heads for recording and reproducing in parallel is one of the effective means for realizing such a high transfer rate. For example, Japanese Patent Laid-Open No. 5-257613 and Japanese Patent Laid-Open No. 8-75009 disclose magnetic heads for recording / reproducing data on / from one magnetic disk, a carriage on which the magnetic head is mounted, and a drive for the carriage. There is disclosed a magnetic disk device in which a plurality of magnetic head units formed of a drive mechanism, a control circuit, and the like are arranged to increase the number of magnetic heads in parallel.

[0004]

In the prior art, a plurality of magnetic head units are arranged in a plane on one magnetic disk. Therefore, since a large area is required as a place for disposing the magnetic head unit, there is a problem that the magnetic disk device cannot be downsized.

Even in a magnetic disk device composed of a single magnetic head, the magnetic head is replaced by a magnetic disk as the capacity of the HDD increases and the data transfer rate increases. It was necessary to make the above recording track track accurately at high speed. Therefore, the acceleration / deceleration characteristics of the rotation speed of the carriage equipped with the magnetic head are also severely limited. Therefore, even in the so-called carriage seek operation of moving the magnetic head to a desired position on the magnetic disk, the reaction force accompanying the high-speed movement of the carriage is transmitted to the HDD body. Due to this reaction force, there is a problem that vibration and noise of the HDD main body, and eventually deterioration of characteristics such as an error of recorded / reproduced data occurs.

An object of the present invention is to arrange a plurality of magnetic head units in a stacked manner by sharing a rotation support shaft of a carriage to reduce an arrangement area and to reduce a reaction force generated by a high speed movement of the carriage. It is to provide a magnetic disk device.

[0007]

SUMMARY OF THE INVENTION A magnetic disk device according to the present invention has a plurality of magnetic disk surfaces sharing the same center axis of rotation, and corresponding magnetic disks for recording data on the respective magnetic disk surfaces. A plurality of magnetic heads opposed to each other, a plurality of carriages in which the respective magnetic heads are incorporated at the far end (distal end), a rotation support shaft for rotating the plurality of carriages at the same rotation center, and a plurality of the plurality of carriages. A plurality of turns incorporated at the ends (proximal ends) near the base of each of the carriages so as to rotate the carriages on the plane parallel to the recording surface of the magnetic disk with the rotation spindle as the central axis. Moving coil,
A magnetic circuit that applies a magnetic field perpendicular to the rotating direction of the plurality of rotating coils, takes out position information from each of the plurality of magnetic heads, and outputs the position information to a head drive control unit, or from the head drive control unit. A plurality of positioning control units that control the plurality of magnetic circuits so that the plurality of magnetic heads face a predetermined position on the plurality of corresponding magnetic disk surfaces based on a command; and the plurality of positioning controls Based on the position information output from each unit, a head drive control unit that issues a command to the corresponding plurality of positioning control units and comprehensively controls the operation of the plurality of magnetic heads is provided. The term "a plurality of magnetic disks" is used to include a disk having a plurality of magnetic recording surfaces such as two front and back surfaces on both sides.

According to this structure, a plurality of carriages each having a magnetic head incorporated in one end thereof and a pivot coil incorporated in the other end centering on the pivot shaft which is the pivot center,
They are arranged so as to share the same rotation support shaft. As a result, a plurality of magnetic head units are stacked and arranged three-dimensionally, so that the arrangement area of the magnetic head units can be reduced. Further, the plurality of carriages are driven by a positioning control unit that gives a drive signal to each of the rotating coils, and each carriage can independently perform its own movement. Furthermore, the operations of the plurality of carriages are managed and integrated by the head drive control unit, so that consistent operations can be realized as a magnetic disk device. For example, by operating each of the plurality of carriages so as to cancel the reaction force generated by the high speed movement, it is possible to reduce the generation of vibration and noise due to the reaction force.

Further, it has a head drive control unit for comprehensively controlling the operation of the magnetic head unit facing each of the plurality of magnetic disks based on information such as position information output from the plurality of positioning control units. As a result, it becomes as if a plurality of magnetic disk devices were incorporated into one magnetic disk device, and the data recording / reproducing capability increases to a multiple thereof in proportion to the number of independently moving magnetic head units. As a result, it is possible to realize a magnetic disk device that is small in size and increases a plurality of magnetic heads in parallel to increase the transfer rate, and can prevent characteristic deterioration due to reaction force.

According to another aspect of the present invention, there is provided a magnetic disk device having a first magnetic disk surface and a second magnetic disk surface sharing the same rotation center axis, the first magnetic disk surface and the second magnetic disk surface. A first magnetic head and a second magnetic head for respectively recording data on the disk surface, and a first and a second carriage in which the first magnetic head and the second magnetic head are incorporated at their far end portions, respectively. A rotation support shaft for rotating the first and second carriages at the same rotation center, and the two carriages parallel to the recording surfaces of the first magnetic disk surface and the second magnetic disk surface, respectively. First and second rotating coils respectively installed in end portions near the bases of the first and second carriages so as to rotate in a direction around the rotating spindle as a central axis,
Position information is taken out from each of the magnetic circuit that gives a magnetic field perpendicular to the rotating direction of the two rotating coils, the first magnetic head and the second magnetic head, and the position information is output to the head drive controller. Alternatively, based on a command from the head drive control unit, the first magnetic head and the second magnetic head are opposed to predetermined positions on the corresponding first and second magnetic disk surfaces, respectively. Two positioning control units that control two magnetic circuits,
And based on the position information output from the two positioning control units, commands are issued to the corresponding two positioning control units, respectively, and the operations of the first magnetic head and the second magnetic head are comprehensively performed. It has a head drive control unit for controlling.

In the magnetic disk device having the above structure, the first magnetic head and the second magnetic head each have a first rotary coil and a second rotary coil incorporated therein, respectively.
Of the first rotating coil and the second rotating coil, respectively.
It is preferable to rotate independently by the drive currents supplied from the positioning controller and the second positioning controller.

According to this structure, the first magnetic head is incorporated in one end of the first carriage, and the first rotation is made in the other end about the rotation support shaft which is the rotation center. Incorporates a coil. A second magnetic head is incorporated in one end of the second carriage, and a second rotating coil is incorporated in the other end of the second carriage with the rotating spindle, which is the center of rotation, as the center. Further, a DC magnetic field formed by a magnetic circuit is formed above and below the first and second rotating coils stacked on the same rotating support shaft and orthogonal to both rotating coils. Further, based on a command from the head drive control unit, the first and second positioning control units supply drive currents to the first and second rotating coils, respectively, and the first and second positioning coils arranged in the DC magnetic field by the magnetic circuit. And the second rotation coil receives a reaction force corresponding to each drive current, and each carriage has a rotation support shaft 9
Rotate around.

As a result, the magnetic heads incorporated in the respective carriages are opposed to desired positions on the magnetic disk to record / reproduce data. Therefore, the first magnetic head and the second magnetic head can independently perform their own seek operations, and their operations are managed and integrated by the head drive control unit, so that consistent operations can be realized as a magnetic disk device. As a result, an operation as if two magnetic disk devices were incorporated into one magnetic disk device is realized, and the ability to record and reproduce data on and from a magnetic disk by one magnetic disk device is respectively the first and the first. The recording / reproducing capability can be doubled by sharing the two magnetic heads.

In the magnetic disk device having the above-described two configurations, the magnetic circuit includes a pair of magnets arranged above and below a plurality of rotating coils mounted on a plurality of carriages stacked on the same rotating spindle. It is preferable to form the pair of magnets by a yoke that magnetically couples them. As a result, a plurality of rotating coils are arranged in a DC magnetic field generated by a pair of magnets, and currents controlled by respective independent positioning control sections are made to flow through these coils, thereby realizing independent carriage movements. it can. As a result, the number of magnets can be reduced for a plurality of rotating coils, which not only helps reduce costs, but is also effective in designing a thin device.

Further, it is preferable that the head drive control section supplies a drive current to the second positioning control section with a phase of a drive current supplied to the first positioning control section being inverted. This causes the second carriage to move 180 degrees out of phase with the first carriage. As a result, the recoil when the first carriage repeats the high-speed seek operation to the second
It can be canceled by the operation of the carriage, and is effective in reducing the vibration due to the seek, and the data recording / reproducing troubles due to the vibration.

It is preferable that the first magnetic head and the second magnetic head are arranged so as to face the same recording surface of the magnetic disk. As a result, recording / reproduction can be performed independently on one magnetic disk by the first magnetic head and the second magnetic head. For example, the data written by the first magnetic head can be immediately reproduced by the second magnetic head to judge the quality. Further, it is also possible to reproduce another signal with the second magnetic head while recording with the first magnetic head, or to find in advance the position to be written with the second magnetic head with the first magnetic head. As a result, it is possible to provide a magnetic disk device capable of recording / reproducing operation in which operations such as so-called follow-up recording and pre-read recording can be realized during one rotation of the magnetic disk.

In a magnetic disk device according to still another aspect of the present invention, the rotary support shaft further comprises a ball bearing in which a plurality of rotating balls roll between a plurality of outer rings and an inner ring connected to the central shaft. It is characterized in that one carriage is connected to at least two adjacent outer rings of the plurality of outer rings.

According to the magnetic disk device having the rotation supporting shaft of this structure, the outer race and the inner race are rotated by preloading the two outer rings connected to one carriage in the axial direction. You can eliminate backlash with the ball. As a result, the respective carriages can be accurately rotated about the common rotation support shaft.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of a magnetic disk device of the present invention will be described below with reference to the accompanying drawings. The same reference numerals are given to corresponding similar parts in each drawing used for the description in each embodiment.

<< Embodiment 1 >> FIG. 1 is a partial plan view showing a structure of a portion related to a magnetic disk and a magnetic head in a magnetic disk device of Embodiment 1 of the present invention, and FIG. 2 is a side view thereof. In FIGS. 1 and 2, the first magnetic disk surface 1a and the second magnetic disk surface 1b are formed on the front and back sides of a single rotating disk, and rotate about a rotation center axis 100. The first magnetic head 2a opposes the first magnetic disk surface 1a formed on the front side of the rotary disk and performs a recording / reproducing operation at a required position on the first magnetic disk surface 1a. Similarly, the second magnetic head 2b is opposed to the second magnetic disk surface 1b formed on the back side of the rotating disk to form the second magnetic head 2b.
The recording / reproducing operation is performed at a required position on the magnetic disk surface 1b. First magnetic head 2a and second magnetic head 2b
Are attached to one end (also referred to as a far end or a distal end) of each of the first carriage 3a and the second carriage 3b. The first rotary coil 7a and the first rotary coil 7a and the first rotary coil 7a are provided at the other end (which may be referred to as a proximal end or a proximal end) of the first carriage 3a and the second carriage 3b opposite to the common rotary support shaft 9. Two rotating coils 7b
Are attached respectively.

As shown in FIG. 2, a first pair of magnets 6a1, 6a2 and a second pair of magnets 6b1,
6b2 is formed of an iron plate having an E-shaped cross section, and is connected by a shield case 8 acting as a yoke to form respective magnetic circuits. Each magnetic circuit gives a DC magnetic field orthogonal to both rotating coils 7a and 7b. The shield case 8 has a pair of first and second magnets 6a1, 6a2, 6b, respectively.
A return loop of a magnetic field orthogonal to both rotary coils 7a and 7b generated by 1 and 6b2 is formed, and unnecessary magnetic flux is blocked from leaking to a space other than the action space in which the orthogonal magnetic field acts. The shield plate 8a integrated with the shield case 8 is located in the middle of the magnets 6a2 and 6b1. The shield plate 8a includes a pair of magnets 6
A1 and 6a2 and the magnets 6b1 and 6b2 form return loops for the respective magnetic fields, and block the magnetic flux so that the mutual magnetic fields do not interfere with each other. The carriages 3a and 3b rotate about the rotation support shaft 9 by the reaction force generated by the currents flowing through the two rotation coils 7a and 7b in the orthogonal DC magnetic field, and are attached to one ends of the carriages 3a and 3b. The magnetic heads 2a and 2b thus moved are moved to desired positions on the magnetic disk surfaces 1a and 1b.

Predetermined drive currents are supplied to the two rotary coils 7a and 7b from the first positioning control section 4a and the second positioning control section 4b, respectively. These drive currents are instructed by the head drive control unit 5 as currents based on positioning control signals that integrally control the movements of the first and second magnetic heads 2a and 2b as a magnetic disk device, and both rotating coils 7a, 7b. That is, the first positioning control unit 4a and the second positioning control unit 4b supply a drive current for moving the magnetic heads 2a and 2b to predetermined positions on the magnetic disk surfaces 1a and 1b, and at the same time, each magnetic head 2a and 2b. The head drive control unit 5 receives position information and the like obtained from
Send to. The head drive control section 5 outputs a positioning control signal to the positioning control sections 4a and 4b based on the control information such as the position information output from the individual positioning control sections 4a and 4b. In this way, the head drive control unit 5 integrally controls the operations of the magnetic heads 2a and 2b and performs comprehensive control of the recording / reproducing operation of the magnetic disk device.

According to the magnetic disk device of the first embodiment, the magnetic heads 2a and 2b can be independently opposed to different desired positions on the magnetic disk surfaces 1a and 1b, respectively. Therefore, the same operation is performed as if the two magnetic disk devices were integrally formed. As a result, the data transfer rate at the time of recording / reproducing realized by one magnetic disk device is doubled by dividing and sharing the two magnetic heads 2a and 2b and the two magnetic disk surfaces 1a and 1b. . For example, the first magnetic head 2
a and the first magnetic disk surface 1a are responsible for video data, and the second magnetic head 2a and the second magnetic disk surface 2b are responsible for audio data, respectively, for recording and reproduction. By doing so, so-called post-record editing, in which the video editing is completed first and then the related sound is edited according to the completed video data, can be easily realized.

Further, in the magnetic disk device of the first embodiment,
Since the carriages 3a and 3b are arranged so as to be stacked so as to share the rotation support shaft 9, the area occupied by the head drive mechanism is similar to that of a single head drive mechanism in plan view, which is effective for downsizing design.
In the above-described magnetic disk device according to the first embodiment, the first and second magnetic disk surfaces 1a and 1b are formed on the front and back sides of one rotating disk. No. 1 on either side of the rotating disk
It goes without saying that the same effect can be obtained by forming the second magnetic disk and the second magnetic disk, respectively.

In the magnetic disk device of the first embodiment,
For example, it is possible to control the movement of the second carriage in the direction in which the vibration caused by the movement of the first carriage is suppressed. For example, the first magnetic head sends the current position information to the head drive control unit 5 via the positioning control unit 4a, and the head drive control unit 5 calculates the position for recording / reproducing on the first magnetic disk surface 1a. . Next, the head drive controller 5
The angular acceleration of the rotational movement of the first carriage that is generated to reach the position of the first magnetic head is obtained. Next, the head drive controller 5 is based on the current position of the second magnetic head sent from the positioning controller 2b.
An angular acceleration that cancels the angular acceleration of the rotational movement of the first carriage is applied to the second carriage through the positioning control unit 4b. By doing so, the movement of the second carriage can be controlled in a direction in which the vibration caused by the movement of the first carriage is suppressed.

<Embodiment 2> FIG. 3 is a partial side view showing the structure of a portion related to a magnetic disk and a magnetic head in a magnetic disk device according to Embodiment 2 of the present invention. The magnetic disk device of the second embodiment differs from that of the first embodiment only in the configuration of the magnetic circuit that applies a DC magnetic field orthogonal to the two rotating coils. Therefore, the same parts as those of the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted. As shown in FIG. 3, the magnetic circuit of the magnetic disk device according to the second embodiment has a first circuit between the pair of magnets 6c1 and 6c2.
And the second rotating coils 7a and 7b are arranged in between. The shield case 8b includes magnets 6c1 and 6c.
A return loop of a magnetic field orthogonal to the first and second rotating coils 7a and 7b generated by c2 is formed, and magnetic flux leaking to a space other than the action space where the orthogonal magnetic field acts is blocked.

Predetermined drive currents are supplied to the first and second turning coils 7a and 7b from the positioning control units 4a and 4b, respectively. These predetermined drive currents are output as currents based on a positioning control signal for integrally controlling the movements of the first and second magnetic heads 2a and 2b as a magnetic disk device according to an instruction from the head drive control unit 5. It is supplied to the rotating coils 7a and 7b. The current flowing in the coils arranged orthogonally in the DC magnetic field generates a reaction force. Therefore, the first and second carriages 3a and 3b, which are integrally formed with both the rotating coils 7a and 7b, rotate around the rotating support shaft 9 and are attached to one ends of the two carriages 3a and 3b. Also, the second magnetic heads 2a and 2b are moved to desired positions on the magnetic disk surfaces 1a and 1b.

First and second positioning control sections 4a, 4b
Supplies a predetermined drive current to each of the rotating coils 7a and 7b to independently control the drive of the first and second carriages 3a and 3b. A drive current for moving the first and second magnetic heads 2a and 2b to predetermined positions on the first and second magnetic disk surfaces 1a and 1b, respectively, is supplied and acquired by both magnetic heads 2a and 2b. The position information and the like are sent to the head drive controller 5. The head drive control unit 5 outputs a positioning control signal based on the control information such as the position information output from both the positioning control units 4a and 4b, and integrates the operations of the first and second magnetic heads 2a and 2b. To control the recording and reproducing operations of the magnetic disk device.

While the magnet shown in the first embodiment requires twice as many magnets as the number of rotating coils, the magnetic disk device of the second embodiment requires only a pair of magnets. Therefore, the number of magnets can be reduced, which not only contributes to cost reduction, but is also effective in thinning the magnetic disk device.

<< Embodiment 3 >> FIG. 4 is a partial side view showing the configuration of a magnetic disk device of Embodiment 3. The magnetic disk device of the third embodiment is different from that of the second embodiment in that the second magnetic disk is used as a dummy magnetic disk to rotate the two carriages in opposite directions. Therefore, the same parts as those of the second embodiment are designated by the same reference numerals and the duplicated description will be omitted. In FIG. 4, the first magnetic disk surface 1a and the second magnetic disk surface 1b are formed on the front and back sides of a single rotating disk, and the center of rotation 10
It is rotating around 0. The first magnetic head 2a faces the first magnetic disk surface 1a formed on the front side of the disk and performs a recording / reproducing operation at a desired position on the first magnetic disk surface 1a, and the second magnetic head 2b. Has a weight equivalent to that of the first magnetic head 2a, and makes the dynamic properties of the second carriage 3b substantially equal to that of the first carriage 3a.

A predetermined drive current is supplied from the first positioning control section 4a to the first rotating coil 7a. The signal inverter 4z phase-inverts the drive current supplied from the first positioning control unit 4a to the first rotary coil 7a by 180 degrees and supplies it to the second rotary coil 7b. First rotating coil 7a
A drive current to the second rotary coil 7b and to the second rotary coil 7b is supplied from the head drive controller 5 to the positioning controller 4a. These signals are produced as a magnetic disk device so as to integrally control the movement of the first and second carriages 3a,
A current based on the positioning control signal output from the head drive control unit 5 is applied to the rotating coils 7a and 7b. The current flowing through the coils arranged orthogonally in the DC magnetic field generates repulsive force. Therefore, the first carriage 3a integrally formed with the first rotating coil 7a rotates about the rotation supporting shaft 9, and the first magnetic head 2a attached to one end of the first carriage 3a is moved. First magnetic disk surface 1a
Move it to the desired position above. Since the second rotating coil 7b is supplied with a drive current having a phase opposite to that of the first rotating coil 7a, the second carriage 3b is not connected to the first carriage 3a.
It rotates in the opposite direction to a. The head drive control unit 5 integrally controls the operation of the first magnetic head 2a based on the control information such as the position information output from the first positioning control unit 4a to comprehensively perform the recording / reproducing operation as the magnetic disk device. Take control.

According to the magnetic disk device of the third embodiment shown in FIG. 4, the first and second carriages 3a and 3b sharing the rotation support shaft 9 are always rotated in opposite phases.
A second carriage 3b that rotates in a reverse phase of a reaction caused by the first magnetic head 2a repeating high-speed seek operations.
It can be canceled by rotating. as a result,
It is possible to reduce the noise caused by the high-speed seek operation of the magnetic head and prevent side effects such as deterioration of data recording / reproducing performance due to vibration. As a modification of the above embodiment, the second
The magnetic head 2a is not mounted on the carriage 3b, but the dynamic properties are made substantially equal to those when the second magnetic head is mounted. For example, the shape and size of the second carriage are different from those of the first carriage. It is also possible to set it up. In that case, needless to say, the second magnetic disk is not always necessary.

<< Embodiment 4 >> FIG. 5 is a partial side view showing the configuration of a magnetic disk device of Embodiment 4. In FIG. The magnetic disk device of the fourth embodiment is different from that of the first embodiment in that it has a magnetic disk having four surfaces and four carriages. Therefore, the same parts as those of the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted. In FIG.
First magnetic disk surface 1a and second magnetic disk surface 1b
Is provided on the front and back of one rotating disk, and the third magnetic disk surface 1c and the fourth magnetic disk surface 1d are provided on the front and back of the other rotating disk, both of which are centered on the rotation center axis 100. Rotate to.

The first magnetic head 2a faces the first magnetic disk surface 1a formed on the front side of the rotary disk, performs a recording / reproducing operation at a required position on the first magnetic disk surface 1a, and The magnetic head 2b faces the second magnetic disk surface 1b formed on the back side of the rotating disk and performs a recording / reproducing operation at a required position on the second magnetic disk surface 1b. Similarly, the third magnetic head 2c faces the third magnetic disk surface 1c and performs a recording / reproducing operation at a necessary position on the third magnetic disk surface 1c, and the fourth magnetic head 2b moves the fourth magnetic head 2b. A recording / reproducing operation is performed at a required position on the fourth magnetic disk surface 1d so as to face the disk surface 1d. The first to fourth magnetic heads 2a, 2b, 2c and 2d are respectively the first
~ It is attached to one end of the fourth carriage 3a, 3b, 3c, 3d. First to fourth carriages 3a, 3
The first to fourth rotating coils 7a, 7b, 7c, 7 are provided at the other ends on the opposite side to the common rotating support shaft 9 of b, 3c, 3d.
d are attached respectively.

As shown in FIG. 5, a pair of magnets 6d.
1, 6d2 are connected by a shield case 8c formed of an iron plate having a U-shaped cross section to form a magnetic circuit.
A DC magnetic field orthogonal to each of the rotating coils 7a, 7b, 7c and 7d is applied. The shield case 8c forms a return loop of a magnetic field orthogonal to the first to fourth rotating coils 7a, 7b, 7c, 7d generated by the pair of magnets 6d1, 6d2, and an action space in which the orthogonal magnetic field acts. Besides, it blocks unnecessary magnetic flux that leaks. The first to fourth rotating coils 7a, 7b, 7c in the orthogonal DC magnetic field,
The first to the fourth due to the repulsive force generated by the current flowing in 7d.
The carriages 3a, 3b, 3c, 3d respectively rotate about the rotation support shaft 9. As a result, the first to the fourth
First to fourth magnetic heads 2a, 2b attached to one end of each of the carriages 3a, 3b, 3c, 3d,
2c and 2d are replaced by first to fourth magnetic disk surfaces 1a and 1b,
Move to the desired position on 1c, 1d.

First to fourth rotating coils 7a, 7b, 7
c, 7d include first to fourth positioning control units 4a, 4b,
Predetermined drive currents are supplied from 4c and 4d, respectively.
These drive currents are instructed by the head drive controller 5,
As a magnetic disk device, first to fourth rotating coils 7a, 7b, 7c, respectively as currents based on positioning control signals for integrally controlling the movements of the first to fourth magnetic heads 2a, 2b, 2c, 2d, It is supplied to 7d. That is, the first
~ The fourth positioning control units 4a, 4b, 4c, 4d connect the first to fourth magnetic heads 2a, 2b, 2c, 2d to the first to fourth magnetic disk surfaces 1a, 1b, 1c, 1d, respectively.
A drive current for moving to a predetermined position above is supplied, and position information and the like obtained from each magnetic head 2a, 2b, 2c, 2d is sent to the head drive controller 5. The head drive control unit 5 includes individual positioning control units 4a, 4b, 4c, 4d.
A positioning control signal is output to each of the positioning control units 4a, 4b, 4c and 4d based on the control information such as the position information output from. In this way, the head drive controller 5
Controls the operations of the respective magnetic heads 2a, 2b, 2c, 2d in an integrated manner, and performs comprehensive control of recording / reproducing operations as a magnetic disk device.

According to the magnetic disk drive of the fourth embodiment shown in FIG. 5, the first to fourth magnetic disk surfaces 1a, 1b and 1 are used.
1st to 4th independently at desired positions on c and 1d
The magnetic heads 2a, 2b, 2c and 2d can be opposed to each other. Therefore, the same operation is performed as if the four magnetic disk devices were integrally formed. As a result, recording and reproduction realized by one magnetic disk device by dividing the four magnetic heads 2a, 2b, 2c, and 2d and the four magnetic disk surfaces 1a, 1b, 1c, and 1d into divisions and sharing them, respectively. The data transfer rate can be increased four times. For example, each of the first to fourth independently operating
Of the magnetic heads 2a, 2b, 2c, and 2d of the above, the first magnetic head 2a and the first magnetic disk surface 1a have video data, the second magnetic head 2b, and the second magnetic head 2b. The audio data is assigned to the magnetic disk surface 1b of No. 2 for recording and reproduction. The same applies to the magnetic heads 2c and 2d and the magnetic disk surfaces 1c and 1d. By doing so, so-called post-record editing, in which the video editing is completed first and then the related sound is edited according to the completed video data, can be easily realized.

As described above in the fourth embodiment, the first to fourth magnetic heads 2a, 2b and 2 which operate independently of each other.
It goes without saying that a faster post-record editing can be performed by combining at least two of c and 2d. Further, even if the number of the four magnetic heads 2a, 2b, 2c and 2d which operate independently as described above is increased, each carriage 3
Since a, 3b, 3c, and 3d share the rotation support shaft 9 in a plan view, the occupied area is the same as the case of one unit, and the effect of miniaturization design is maintained. Further, in the magnetic disk device of the fourth embodiment, an example in which four magnetic heads are used for four magnetic disk surfaces formed on the front and back of two rotating disks has been described, but more magnetic disk surfaces are used. However, it goes without saying that it can be implemented in the same manner. Needless to say, like the magnetic disk device of the third embodiment, by rotating two sets of magnetic heads in opposite directions, it is possible to realize a magnetic disk device that is compatible with high-speed seek operation.

<Embodiment 5> FIG. 6 is a partial plan view showing the structure of a portion related to a magnetic disk and a magnetic head in a magnetic disk device according to Embodiment 5 of the present invention, and FIG. 7 is a side view thereof. The magnetic disk device of the fifth embodiment is different from that of the first embodiment in that two magnetic heads are opposed to one magnetic disk surface. Therefore, the same parts as those of the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted. In FIGS. 6 and 7, the first magnetic disk surface 1a is formed on the front side of the rotating disk and rotates about the rotation center axis 100. The first magnetic head 2a and the second magnetic head 2b face the first magnetic disk surface 1a and perform recording / reproducing operations at desired positions on the first magnetic disk surface 1a. The first magnetic head 2a and the second magnetic head 2b are respectively the first carriage 3a.
And attached to one end of the second carriage 3b. A first rotary coil 7a and a second rotary coil 7b are attached to the other ends of the first carriage 3a and the second carriage 3b, respectively, which are opposite to the common rotary spindle 9. .

As shown in FIG. 7, a pair of magnets 6a.
1, 6a2 are connected by a shield case 8b formed of an iron plate having a U-shaped cross section to form a magnetic circuit, and apply a direct-current magnetic field orthogonal to both rotary coils 7a, 7b. The shield case 8b forms a return loop of a magnetic field orthogonal to both rotary coils 7a and 7b generated by the pair of magnets 6a1 and 6a2, and blocks unnecessary magnetic flux leaking to a space other than the action space where the orthogonal magnetic field acts. is doing. The carriages 3a and 3b rotate about the rotation support shaft 9 by the reaction force generated by the currents flowing through the two rotation coils 7a and 7b in the orthogonal DC magnetic field, and are attached to one ends of the carriages 3a and 3b. The magnetic heads 2a and 2b thus moved are moved to desired positions on the magnetic disk surface 1a.

Predetermined drive currents are supplied to the two rotary coils 7a and 7b from the first positioning control section 4a and the second positioning control section 4b, respectively. These drive currents are instructed by the head drive control unit 5 as currents based on positioning control signals that integrally control the movements of the first and second magnetic heads 2a and 2b as a magnetic disk device, and both rotating coils 7a, 7b. That is, the first positioning control unit 4a and the second positioning control unit 4b supply a drive current for moving the magnetic heads 2a and 2b to a predetermined position on the magnetic disk surface 1a, and at the same time, each magnetic head 2 is moved.
The position information and the like obtained from a and 2b are sent to the head drive controller 5. The head drive control section 5 outputs a positioning control signal to the positioning control sections 4a and 4b based on the control information such as the position information output from the individual positioning control sections 4a and 4b. In this way, the head drive control unit 5 integrally controls the operations of the magnetic heads 2a and 2b and performs comprehensive control of the recording / reproducing operation of the magnetic disk device.

According to the magnetic disk device of the fifth embodiment, the magnetic heads 2a and 2b can be independently opposed to desired positions on the magnetic disk surface 1a. Therefore, the same operation is performed as if the two magnetic disk devices were integrally configured. As a result, the data transfer rate at the time of recording / reproducing realized by one magnetic disk device is doubled by dividing the portion on the magnetic disk where the two magnetic heads 2a and 2b face each other. For example, the first magnetic head 2a and the second magnetic head 2a are made to respectively record and reproduce video data and audio data in divided recording areas on the magnetic disk surface 1a. By doing so, the so-called post-record editing, in which the video editing is completed first and then the related sound is edited according to the completed video data, can be easily realized.

Further, the first magnetic head 2 is placed on the magnetic disk.
The data written in b is immediately transferred to the first magnetic head 2
It is also possible to play back with a and judge the quality. Further, it is possible to reproduce with the second magnetic head 2b even when recording with the first magnetic head 2a. In this way, the so-called chasing playback operation can be easily realized. Further, similarly to the magnetic disk device of the first embodiment, the first and second carriages 3a and 3b are arranged in a stacked manner with the rotation support shaft 9 in common. 1
Similar to the case of a stand, it is effective for downsizing design.

<Embodiment 6> FIG. 8 is a sectional view showing a structure of a bearing portion of a rotation support shaft of a carriage in a magnetic disk device according to Embodiment 6 of the present invention. The magnetic disk device of the sixth embodiment is characterized by the bearing portion of the rotary support shaft. Therefore, the rotation supporting shaft which is a characteristic portion will be described. In FIG. 8, the rotary support shaft 9 of the magnetic disk device of the sixth embodiment has rotary balls 12a, 12a, 12b, 12b, 1
2e, 12e, 12h, 12h are race surfaces 13a, 13b, which are rolling surfaces of a rotating ball formed on the central axis 9a,
13c, 13d and outer rings 10a, 10b, 10c, 10d
It is composed of a ball bearing that rolls between and.

A pair of outer rings 10a, 10b and an outer ring 10c,
Each pair of 10d is paired. The two outer ring outer wall members 14a, 14b have a first pair of outer rings 10a, 10b.
And a second pair of outer rings 10c, 10d are incorporated, respectively. The first pair of outer rings 10a, 10b and the second pair of outer rings 10c, 10d are respectively provided with preload springs 11a, 1a.
Preloading is applied in the axial direction of the rotation support shaft 9 by 1b. Due to this bias, the first pair of outer rings 10a, 10b
And the second pair of outer rings 10c and 10d and the race surfaces 13a and 13b and 13c and 13d on the central shaft 9a, respectively, the rolling balls roll without play. Further, the outer ring outer wall members 14a and 14b are cylindrically ground by cutting the outer wall of each of the outer ring outer wall members 14a and 14b with the pivot shaft 9 as a reference. As a result, the outer ring outer wall members 14a and 14b can rotate independently around the rotation support shaft 9 with high accuracy.

Further, a first carriage 3a and a second carriage 3b are attached to the outer peripheries of the outer ring outer wall members 14a and 14b, respectively, and the first carriage 3a and the second carriage 3b are constructed by a series of these constructions. It is possible to perform accurate rotational movements about the common rotational support shaft 9 respectively. The central shaft 9a has a known configuration and is vertically fixed to the main body of the magnetic disk device by a fixing screw portion 9b.

According to the bearing construction of the magnetic disk drive of the sixth embodiment shown in FIG. 8, the races 13a, 13b, 13c and 13d which are the constituent elements of the ball bearing are formed on the central shaft 9a to form the outer races 10a and 10b. A ball bearing having a small outer diameter of 10c or 10d can be realized. Further, the first pair of outer rings 10
By incorporating a and 10b and the second pair of outer rings 10c and 10d in pairs into the outer ring outer wall members 14a and 14b, respectively, it is possible to realize a rotation spindle having high precision and good assembly workability.

<Embodiment 7> FIG. 9 is a sectional view showing a structure of a bearing portion of a rotation support shaft of a carriage in a magnetic disk apparatus according to Embodiment 7 of the present invention. The magnetic disk device according to the seventh embodiment has a structure in which the inner ring of the ball bearing is biased in one direction along the rotation support shaft. Therefore, the rotation supporting shaft which is a characteristic portion will be described. In FIG. 9, the rotation support shaft 9 in the magnetic disk device of the seventh embodiment is represented by outer rings 10a, 1
0b, 10c, 10d, rotating balls 12a, 12b, 12
e, 12h, and inner rings 18a, 18b, 18c, 18d
It has four sets of ball bearings. The outer ring 10a, 10b of two sets of ball bearings has a first
Carriage 3a is attached, and the second carriage 3b is attached to the outer circumferences of the outer rings 10c and 10d of the other two sets of ball bearings.
Is assembled. With this series of configurations, the first carriage 3a and the second carriage 3b can rotate about the common rotation support shaft 9. The rotating support shaft 9 is vertically fixed to the main body of the magnetic disk by the fixing screw portion 9b.

The four ball bearings are incorporated in the rotary support shaft 9, and the E-shaped retaining ring 1 is provided at one end above the rotary support shaft 9.
6a, and stops the upward movement of the inner ring 18a of the uppermost ball bearing via the pressing plate 15a. On the other hand, a preload spring 17 is incorporated at one end below the rotation support shaft 9 via a pressing plate 15d fixed by an E-shaped retaining ring 16b. Then, the preload spring 17 causes the innermost ring 1 in the lowermost stage.
A preload urging force is applied to 8d in the upward direction via a pressing plate 15c. The preload urging force applied to the inner ring 18d is the rotating balls 12 and 12h, the outer ring 10d, the second carriage 3b, the outer ring 10c, the rotating ball 12e, the inner ring 18c, and the pressing plate 15.
b, inner ring 18b, rotating ball 12b, outer ring 10b, first carriage 3a, outer ring 10a, rotating ball 12a, inner ring 18
It is received by the ε-type retaining ring 16a through a path that is transmitted to a, the pressing plate 15a, and a known ε-type retaining ring 16a (a substantially ε-shape having a short protruding piece at the center of the C shape) 16a. As a result, the rotating balls of the four ball bearings roll without play between the outer ring and the inner ring. As a result, the first carriage 3a and the second carriage 3b can independently and accurately pivot about the common pivot shaft 9.

In the bearing structure of the magnetic disk drive of the seventh embodiment, a standard type low-priced ball bearing which is widely commercially available can be used. Further known ε type retaining ring 1
After assembling 6a into the rotation support shaft 9, pressing plates 15a, 2
A first carriage 3a incorporating a single ball bearing, a pressing plate 15b, a second carriage 3b incorporating another two ball bearings, a pressing plate 15c, a preload spring 17, a pressing plate 15d, an ε-type retaining ring 16b. The carriage can be incorporated into the rotary support shaft by incorporating the above in order. As a result, it is possible to provide a low-cost magnetic disk device due to the economical efficiency of using low-cost parts and the improvement of the assembling workability by a simple assembling work.

[0051]

As described in detail in the above embodiments, the magnetic disk apparatus of the present invention incorporates a plurality of carriages that rotate independently into a common rotation support shaft. Therefore, an operation as if a plurality of magnetic disk devices were incorporated in one magnetic disk device can be realized. As a result, the recording / reproducing capability can be increased by sharing the capability of recording / reproducing data on / from a plurality of magnetic disc surfaces in a single magnetic disc device with a plurality of corresponding magnetic heads. Further, it is possible to realize a magnetic disk device which is small in size and increases a plurality of magnetic heads in parallel to increase the transfer rate and can prevent characteristic deterioration due to reaction force.

By incorporating the first and second magnetic heads in the first and second carriages respectively, the operation is performed as if two magnetic disk devices were incorporated in one magnetic disk device. It is possible. As a result, the recording and reproducing ability can be doubled by making the first and second magnetic heads share the same. Furthermore, video data and audio data are recorded separately,
So-called post-record editing, in which sound is added after editing video data, can be easily performed.

Further, by incorporating a plurality of carriages into a common rotary support shaft, the number of magnets that give a DC magnetic field orthogonal to the rotary coils can be reduced to two in total regardless of the number of rotary coils. it can. As a result, it not only helps to reduce the cost, but also has a great effect on the thin design of the magnetic disk device. Further, it becomes possible to always move the first and second carriages that share the rotation support shaft in opposite phases, and the reaction of the first carriage due to the repetition of the high-speed seek operation can be performed in the opposite direction of the second carriage. It can be canceled by rotating. As a result, there is little noise, and side effects such as deterioration of data recording / reproducing performance due to vibration can be prevented.

Further, by disposing the first and second magnetic heads so as to face the same recording surface of one magnetic disk, the first and second magnetic heads are independently provided on one magnetic disk. Recording and reproduction can be performed. For example, the data written by the first magnetic head can be immediately reproduced by the second magnetic head to judge the quality. Further, it is also possible to reproduce another signal with the second magnetic head while recording with the first magnetic head, or to find in advance the position to be written with the second magnetic head with the first magnetic head. As a result, it is possible to provide a magnetic disk device capable of recording / reproducing operations in which operations such as so-called chase reproduction and pre-read recording can be realized during one rotation of the magnetic disk.

Further, the rotating support shaft is constituted by a ball bearing in which a plurality of rotating balls roll between a plurality of outer rings and an inner ring connected to the central shaft, and at least two adjacent outer rings of the plurality of outer rings are provided. The outer ring is formed by connecting one of the carriages. According to the magnetic disk device having the rotation support shaft of this configuration, by preloading the two outer rings connected to one carriage in the axial direction, the race surface of each of the outer ring and the inner ring and the rotating ball are formed. You can eliminate backlash. As a result, the respective carriages can be accurately rotated about the common rotation support shaft.

[Brief description of drawings]

FIG. 1 is a partial plan view showing a configuration of a portion related to a magnetic disk surface and a magnetic head in a magnetic disk device according to a first embodiment of the present invention.

FIG. 2 is a partial side view showing the configuration of FIG.

FIG. 3 is a partial side view showing a configuration of a portion related to a magnetic disk surface and a magnetic head in a magnetic disk device according to a second embodiment of the present invention.

FIG. 4 is a partial side view showing a configuration of a portion related to a magnetic disk surface and a magnetic head in a magnetic disk device according to a third embodiment of the present invention.

FIG. 5 is a partial side view showing a configuration of a portion related to a magnetic disk surface and a magnetic head in a magnetic disk device according to a fourth embodiment of the present invention.

FIG. 6 is a partial plan view showing a configuration of a portion related to a magnetic disk surface and a magnetic head in a magnetic disk device according to a fifth embodiment of the present invention.

7 is a partial side view showing the configuration of FIG.

FIG. 8 is a sectional view showing a structure of a bearing portion of a rotation support shaft of a carriage in a magnetic disk device according to a sixth embodiment of the present invention.

FIG. 9 is a cross-sectional view showing the configuration of a bearing portion of a rotation support shaft of a carriage in a magnetic disk device according to a seventh embodiment of the present invention.

[Explanation of symbols]

1a, 1b, 1c, 1d magnetic disk surfaces 2a, 2b, 2c, 2d magnetic heads 3a, 3b, 3c, 3d carriages 4a, 4b, 4c, 4d positioning controller 5 head drive controllers 6a1, 6a2, 6b1, 6b2, 6c1, 6c2, 6
d1, 6d2 magnets 7a, 7b, 7c, 7d rotating coils 8, 8b, 8c shield case 8a shield plate 9 rotating support shaft 9a central shaft 9b fixing screw portions 10a, 10b, 10c, 10d outer rings 11a, 11b preload coil spring 12a , 12b, 12c, 12d, 12e, 12f, 1
2g, 12h Rotating balls 13a, 13b, 13c, 13d Race surfaces 14a, 14b Outer ring outer wall members 15a, 15b, 15c, 15d Pressing plates 16a, 16b E-type retaining ring 17 Preload leaf springs 18a, 18b, 18c, 18d Inner ring 100 rotation Central axis (magnetic disk)

Claims (10)

[Claims] 1. A plurality of magnetic disk surfaces sharing the same center axis of rotation, a plurality of magnetic heads opposed to each other on the corresponding magnetic disks for recording data on the respective magnetic disk surfaces, and each of the magnetic fields. A plurality of carriages in which heads are incorporated at the far end (distal end), a rotation support shaft for rotating the plurality of carriages at the same rotation center, and a plurality of carriages parallel to the recording surface of the magnetic disk surface. A plurality of rotating coils incorporated in an end portion (proximal end) close to the base portion of each of the carriages so as to rotate on the plane with the rotating support shaft as a central axis; A magnetic circuit that gives a magnetic field perpendicular to the moving direction, and extracts position information from each of the plurality of magnetic heads and outputs the position information to a head drive control unit, or Based on a command from the head drive control unit, a plurality of positioning control units that control the plurality of magnetic circuits so that the plurality of magnetic heads face a predetermined position on the corresponding plurality of magnetic disk surfaces. , And a head drive control unit that comprehensively controls the operation of the plurality of magnetic heads by issuing commands to the corresponding plurality of position control units based on the position information output from the plurality of position control units. A magnetic disk device characterized by having. 2. A first magnetic disk surface and a second magnetic disk surface that share the same rotation center axis, and data is recorded on the first magnetic disk surface and the second magnetic disk surface, respectively. A first magnetic head and a second magnetic head; first and second carriages in which the first magnetic head and the second magnetic head are incorporated at the far end portions, respectively, and the first and second carriages. A rotation support shaft that rotates about the same rotation center; and a center shaft that rotates the two carriages in a direction parallel to the recording surfaces of the first magnetic disk surface and the second magnetic disk surface, respectively. First and second rotating coils respectively installed at end portions near the bases of the first and second carriages so as to rotate as a magnetic field perpendicular to the rotating direction of the two rotating coils. Magnetism Path, the position information is extracted from the first magnetic head and the second magnetic head, and the position information is output to the head drive control unit, or the first magnetic head is output based on a command from the head drive control unit. And two positioning control units that control the two magnetic circuits so that the second magnetic head faces a predetermined position on the corresponding first and second magnetic disk surfaces, respectively, and
Based on the position information output from the two positioning control units,
A magnetic disk device comprising a head drive control unit for issuing a command to each of the two corresponding positioning control units and comprehensively controlling the operations of the first magnetic head and the second magnetic head. . 3. The first magnetic head and the second magnetic head are provided on the first carriage and the second carriage incorporating a first rotating coil and a second rotating coil, respectively. The first rotating coil and the second rotating coil are independently rotated by drive currents supplied from the first positioning controller) and the second positioning controller, respectively. The magnetic disk drive according to claim 2, which is characterized in that. 4. The first magnetic disk surface and the second magnetic disk surface.
The magnetic disk surface of the disk is on both front and back surfaces of one rotating disk, and the first magnetic head and the second magnetic head are arranged so as to face both front and back surfaces of the one disk. The magnetic disk device according to claim 1. 5. A pair of magnets arranged above and below a plurality of rotating coils respectively provided on a plurality of carriages arranged in a stack on the same rotating support shaft, and the pair of magnets. The magnetic disk device according to claim 1, further comprising a yoke that magnetically couples the magnet. 6. The head drive control unit supplies the second positioning control unit with a drive current in which the phase of the drive current supplied to the first positioning control unit is inverted. ~ The magnetic disk device according to claim 5. 7. The first magnetic head and the second magnetic head are arranged so as to face each other at the same position on the plane of the recording surface of the front and back of the magnetic disk surface. The magnetic disk device according to claim 6. 8. The rotation support shaft comprises a plurality of outer rings and at least one inner ring having a common center axis, and a ball bearing having a plurality of rolling balls rolling between the plurality of outer rings. 8. The magnetic disk drive according to claim 1, wherein one of the carriages is connected to at least two outer rings adjacent to each other. 9. An inner ring race surface, which is a rolling surface on the inner ring side of the ball bearing, is provided on the central shaft, and the two adjacent outer rings connecting the carriage are attached by springs so as to separate from each other in the axial direction. 9. The method according to claim 8, wherein
The magnetic disk device according to 1. 10. The magnetic disk drive according to claim 8, wherein all the inner rings of the ball bearing are urged in one direction on the axis of the rotation support shaft.