JPH02149913A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To improve the density of recording and to prevent a magnetic recording medium and a magnetic head from being abraded by providing an ultrasonic vibration impressing means which adds ultrasonic vibration in a vertical direction to the surface of the magnetic recording medium to the magnetic head. CONSTITUTION:The ultrasonic vibration impressing means A which adds the ultrasonic vibration in the vertical direction to the surface of the magnetic recording medium on the magnetic head is provided. When the ultrasonic vibration generation device A is operated, the movable part 45 thereof is vibrated and moved in the radius direction of an arm cylinder 4 which is integrated in the movable part 45. Due to that, the magnetic head 2 which is integrated in the arm is vibrated in ultrasonic in the vertical direction to the surface of a magnetic tape 1. Therefore, when the magnetic head 2 and the magnetic recording medium 1 collide with each other, they immediately reject and separate each other. By repeating such an action, the mutual fine gap between them is maintained. Thus, the mutual abrasion between them is prevented from occurring and the recording density of a magnetic recording device is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a magnetic recording medium such as a magnetic tape, a magnetic disk (hard disk), a floppy disk, and a magnetic card, which is used as a recording medium to write or read information using a magnetic head. related to magnetic recording devices.

[Prior Art] As shown in the block diagram in FIG. 13, a magnetic recording device mainly consists of a magnetic recording medium for recording information, and a magnetic recording medium for writing or reading information on or from the magnetic recording medium. The drive mechanism that moves the magnetic head relatively along the surface of the recording medium, and the control and control of each part.
As the magnetic recording medium, a magnetic tape, a magnetic disk (hard disk), a floppy disk, a magnetic card, etc. are used. The magnetic head used is one in which a coil is wound around a high permeability magnetic core that looks over a small gear A/tube. As the drive mechanism, a rotary motor or a linear actuator is mainly used. Electronic circuits and 1.
In this case, a drive circuit for a magnetic head, a drive circuit for a drive mechanism, a circuit for processing information, and a circuit for guaranteeing reliability, etc. are required.

All conventional magnetic recording devices of this type have a structure in which the magnetic Δ, rad and the magnetic recording medium perform relative movement only in the direction parallel to the medium surface.7 [Problems to be Solved by the Invention] In a magnetic recording device, when a magnetic head moves relative to the surface of a magnetic recording medium to perform reading and writing, this (I) movement usually causes a gap between the magnetic head and the magnetic recording medium. A minute gap is created between the two, and this minute gap has the effect of preventing magnetic flux and wear of the magnetic recording medium. However, the recording density of a magnetic recording device is limited by this minute gap, and the recording density is If the minute gap is set small, the magnetic recording medium will wear out when moving relative to the magnetic head, and the reliability of the device as a whole will be lost.

By the way, in a magnetic disk drive, in order to prevent the phenomenon in which the magnetic head sticks tightly to the magnetic disk and does not separate from it (a condition called adhesion) and the magnetic disk does not start moving at startup, the magnetic disk The conventional idea is to apply ultrasonic vibrations to the magnetic head in a direction parallel to the surface of the magnetic recording medium when starting up the magnetic head, thereby increasing the distance of the magnetic head from the surface of the magnetic disk. Vibration in a direction parallel to the recording medium surface can only be applied at the time of startup, and does not affect the minute gap between the magnetic recording medium and the magnetic head, so it cannot solve the above problem.

The present invention has been made in view of the above circumstances, and aims to increase the recording density by maintaining the microgap between the magnetic recording medium and the magnetic head by 1 minute, while simultaneously increasing the recording density between the magnetic recording medium and the magnetic head. An object of the present invention is to provide a magnetic recording device that can prevent wear of the magnetic recording device.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a t=th magnetic recording medium for recording information, and writing information to the magnetic recording medium in contact with the magnetic recording medium. Alternatively, in a magnetic recording device f::magnetic recording device &, ':, which includes a magnetic head that performs reading and a drive mechanism that moves the magnetic head relative to the magnetic recording medium, An ultrasonic vibration applying means for applying ultrasonic vibration in a vertical direction was provided.

[Operation] In the above configuration, since the magnetic head vibrates ultrasonically in a direction perpendicular to the surface of the magnetic recording medium, when the magnetic head and the magnetic recording medium collide with each other, they immediately repel each other and are crushed, and this process is repeated. to maintain a small gap between them.

Therefore, the time when the magnetic recording medium and the magnetic head are apart from each other is longer than the time when they are in contact with each other.
f) Wear between the two is effectively prevented. Furthermore, since wear of the magnetic recording medium and the magnetic head is prevented, the minute gap between them can be set to be one minute smaller, and the recording density of the magnetic recording device can be improved.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 12.

As shown in the block diagram, the twelfth factor of the present invention is that the magnetic head is provided with ultrasonic vibration applying means for applying ultrasonic vibration in a direction perpendicular to the surface of the magnetic recording medium.

First, specific examples of magnetic recording devices to which the present invention is applied are shown in FIGS. 1, 2, 3, and 4, respectively.

1 (2 is a side view showing the main part of a magnetic tape device such as a VTR, R-DAT, etc., that is, a magnetic recording device whose magnetic recording medium is a magnetic tape. In the same figure, 1 is a magnetic tape device which is a magnetic recording medium. , 2 is a magnetic head. 3 is a chassis of the magnetic tape device, and 4 is a cylinder consisting of a lower fixed cylinder 5 and an upper rotating cylinder 6. The lower fixed cylinder 5 is fixed to the chassis 3. The magnetic head 1
is attached to the upper rotating cylinder 6 side.

7 is a rotating motor that rotationally drives the upper rotating cylinder 6;
It is attached to chassis 3. The rotary motor 7 and the upper rotary cylinder 6 constitute a drive R for moving the magnetic head 1 relative to the magnetic tape 2.

The second [21] is a perspective view of a main part of a magnetic disk device, that is, a magnetic recording device whose magnetic recording medium is a magnetic disk (hard disk). In the figure, 11 is a magnetic disk, and 12 is a magnetic head. 13 is a spindle to which the magnetic disk 11 is fixed, and 14 is a rotary motor that rotationally drives the spindle.

The magnetic head 12 is attached to the tip of a gimbal spring 16 whose base end is fixed to the arm 15. This gimbal spring 16 is a stainless steel plate spring, and the tip of the gimbal spring 16, which takes the magnetic head 12 by one inch, is shaped like a horizontal U. The arm 15 is a linear actuator 1 for moving the head.
7, it is reciprocated in the horizontal direction of the arrow. For example, a step motor or a voice coil motor is used as the linear actuator 17. Reference numeral 18 indicates an IC for writing and reading by the magnetic head 12. The rotary motor 14 and spindle 13 are the drive mechanism on the magnetic disk 11 side, and the linear actuator 17, arm 15 and gimbal spring 16 are the drive mechanism on the magnetic head 12 side. Configure.

FIG. 3(A) is a perspective view showing the main parts of a floppy disk device, that is, a magnetic recording device whose magnetic recording medium is a floppy disk. In the figure, 21 is a floppy disk placed in a jacket, and 22 is a magnetic head. 23 is a spindle that supports the floppy disk 21, and 24 is a rotary motor that rotationally drives the spindle 23. The magnetic head 22 is housed in a gimbal spring 26 attached to an arm 25. As shown in an enlarged view in FIG. 3(B), this gimbal spring 26 has an edge fixed to a hole 25a made at the tip of the arm 25, and is attached to four points around the magnetic head 22, on the front, back, left and right. It has a supporting shape, and is not only elastically deformable in a direction perpendicular to the medium surface in order to flexibly support the magnetic head 22, but also slightly elastically deformable in the horizontal direction to prevent damage to the magnetic head. - The arm 25 is reciprocated in the horizontal direction of the arrow by a linear actuator 27 for moving the head using, for example, a step motor or a voice coil motor, as described above. The rotary motor 24, spindle 23, etc. constitute a drive mechanism on the floppy disk 21 side, and the linear actuator 27, arm 25, gimbal spring 26, etc. constitute a drive mechanism on the magnetic head 22 side.

FIG. 4 is a perspective view showing the main parts of a magnetic card device, that is, a magnetic recording device whose magnetic recording medium is a magnetic card, in which numeral 31 is a magnetic card and numeral 32 is a magnetic head.

The magnetic head 32 is attached to an Iu-shaped presser spring 33 fixedly attached to the main body of the apparatus. 34
is a feed roller that drives the magnetic card 31 and constitutes a drive mechanism. A pad 35 is placed on the back surface of the magnetic card 31 facing the magnetic head 32.

Next, an ultrasonic vibration generator for generating ultrasonic vibrations to be applied to the magnetic head will be described.

Figure 5 shows piezoelectric element type ultrasonic vibration generation '3! p100A is shown. This ultrasonic vibration generator A produces fJf layer pressure 41
This laminated piezoelectric body 41 has a structure in which a plurality of piezoelectric bodies 42 made of zirconium titanate lead caps are laminated in layers with electrodes 113 sandwiched therebetween. 44 is a fixing part that fixes the laminated piezoelectric body 41. 45 is the super γf of the laminated piezoelectric material 41
It is a rigid movable part that transmits wave vibrations to an object to be excited, and is fixed to the upper surface of the laminated piezoelectric body 41 in a cross-shaped manner. The high frequency power source 46 that applies a voltage to the piezoelectric body 41 has a frequency of 20 KHz or more and a voltage of about 10-1.000 V, for example.The laminated piezoelectric body 41 is driven by the high frequency power source.
The movable part 45 vibrates ultrasonically downward in the direction indicated by the arrow.

Of course, it is also possible to directly fix the vibration object to the upper surface of the earth and mud laminated piezoelectric body 4 and vibrate the two vibration objects directly by the laminated piezoelectric body 41.

FIG. 6 shows a magnetostrictive element type ultrasonic vibration generator: ηB.

This ultrasonic vibration generator B has the proximal end of the movable part 18 of the leaf spring fixed to the support base 47 fixed to the fixed part 4-1,
Fixing part ・Fixed to 16, example is FeCo-3i
-B @- The upper surface of the high magnetostrictive magnetic material 4g, such as gold, is connected to the back surface of the movable part 48.1, -G) A coil 50 surrounding the high magnetostrictive magnetic material 49 is provided l: horizontally to j.

A high frequency power source 51 is connected to this coil 50. This high frequency power source 51 has a frequency of 20 KHz 121, for example, and a current of about several tens of amperes, and has high magnetostrictive magnetism.

Stretching and contraction vibration 11 under the action of the alternating magnetic field generated by
, the tip of the movable part 48, which is a leaf spring, vibrates ultrasonically up and down as shown by the arrow.

Note that this magnetostrictive element type field 8 can also be directly vibrated by fixing the excitation weight directly to the magnetostrictive element.

FIG. 7 shows an electromagnetic force type ultrasonic vibration generator C using an electric wave jJ due to the action of a magnetic field and a current σ). This ultrasonic vibration generator (!) fixes the proximal end of the movable part 54 of the plate spring to the support base 53 fixed to the fixed part 52.
Lower surface C of 4: barium f1. light, alnico magnet,
A permanent magnet 55 made of a rare earth metal such as CO[Ti] is fixed (the permanent magnet 55 is floating from the fixed part 52), while the fixed part 5
It has a structure in which a coil 56 through which the permanent magnet 55 is inserted is arranged on the second side. Note that the permanent magnet 55 generates a horizontal magnetic field, and it is preferable to arrange a yoke (fixed to the movable part 54 ) outside the coil 56 (f, not shown). Fixed! , 1. Wind on the indicated bobbin. When a high frequency current flows through the coil 56, the current flowing through the coil 56 and the magnetic field generated by the permanent magnet 55 act together.
-), an electromagnetic force according to Fleming's left-hand rule is generated between the coil 56 and the permanent magnet 55, but since the coil 56 is fixed, the permanent magnet 55 side is -) and the movable part 5.1 is -). It vibrates back and forth at F and generates ultrasonic vibrations. In addition, the amplitude of the vibration produced by the following H sound wave generators is several hundred amperes to several μm.
It should be about 0.

Next, the ultrasonic vibration generators A, B, and C described above are employed to apply ultrasonic vibrations in the direction perpendicular to the magnetic recording medium surface number to the magnetic head in each magnetic recording device. Describe an example--J゛ro.

FIG. 8 shows the case where ultrasonic vibration is applied to the magnetic head 2 in the magnetic tape device described in section 1-7 in section 1 [4]. As shown in the figure, the magnetic hand 2 is attached to the arm 1.61 via the head holding part 60, and the arm 6 of
The wide end of 1 is connected to the ultrasonic vibration of the piezoelectric element 1-7 shown in FIG. The movable parts 48 in the sonic vibration generator B are fixed to the respective tips of the movable parts 54 in the electromagnetic force type ultrasonic vibration generator C shown in FIG. Movable part: 15 mm/,: 48 mm, 5 mm
, 1g) The direction of vibration is in the radial direction of the cylinder 4 as shown by the arrow.

In the magnetic recording device having the above configuration, when the ultrasonic vibration generator A or B or C is operated, the respective movable parts 45 or 48 or 5 are activated. -1 is vibration 11, γ integrated with this movable part 45 or 48 or 54
- The unevenness 1 vibrates in the radial direction of the cylinder 4 as shown by the arrow in FIG.

FIG. 9(A) shows the case where ultrasonic vibration is applied to the magnetic head 12 in the magnetic disk device shown in FIG. In the figure, the magnetic disk 11, magnetic head 12, arm 15, and gimbal spring 16 are as described in FIG. In this embodiment, the gimbal spring 16 and the magnetic head 12
This is a structure in which, for example, a laminated piezoelectric body 41 shown in FIG. 5 is interposed between the two. In this case, the resonant frequency of the gimbal spring 16 and the ultrasonic frequency of the laminated piezoelectric body 41 are set to be different.

In the above configuration, when a high frequency voltage is applied to the laminated piezoelectric body 41, the laminated piezoelectric body 41 expands and contracts in the vertical direction, and the magnetic head 12 fixed to the lower surface of the laminated piezoelectric body 41 moves perpendicularly to the surface of the magnetic disk 11. In the above embodiment, the magnetic head 12 is directly vibrated by the vibration of the i'it layer piezoelectric material 41. It is also possible to have a structure in which the vibration is made via the movable part 45 of the generator A or the like. That is, as shown in FIG. 9(b), for example, the horizontal U
The tip of the movable part 45 is fixed to the lower part of the letter-shaped cymbal spring 16.

In this case, the movable part 45 to the ultrasonic vibration generator vibrates up and down, so that the magnetic head 12 moves toward the magnetic disk 1.
vibrates perpendicular to the plane of 1.

Moreover, the magnetic head 12 can be caused to vibrate ultrasonically in the same manner by using the high magnetostrictive magnetic material 49 shown in FIG. 6 instead of the laminated piezoelectric material 41 in FIG. 9(A). Either direct vibration by this highly magnetostrictive magnetic material 49 or vibration via the movable part 48 is possible.

Although not shown, it is also possible to employ the electromagnetic force type ultrasonic vibration generator C shown in FIG. In this case, the structure as shown in FIG. 9(B) described above is adopted, and the lower part of the horizontal U-shaped gimbal spring 16 is attached to the movable part 54 shown in FIG.
Fix the tip of the

FIG. 10(A) is a diagram showing the case where ultrasonic vibration is applied to the magnetic head 22 in the floppy disk device described in FIG. 3, and the arm 25 and gimbal spring 26 are as described in FIG. 3.

In this embodiment, a laminated piezoelectric body 41 as shown in FIG. is fixed.

In this case, the resonant frequency of the gimbal spring 26 and the ultrasonic frequency of the laminated piezoelectric body 41 are set to be different. Note that in the illustrated embodiment, the laminated piezoelectric body 41 has a structure in which the laminated piezoelectric body extends also above the gimbal spring 26 in consideration of inertia during expansion and contraction of the laminated piezoelectric body 41, but it may naturally extend only below the gimbal spring 26.

In the above configuration, when a high frequency voltage is applied to the laminated piezoelectric body 41, the laminated piezoelectric body 41 expands and contracts in the vertical direction, and the magnetic head 22 fixed to the lower surface of the laminated piezoelectric body 41 moves vertically to the surface of the floppy disk 21. Sound waves vibrate.

Note that instead of directly vibrating the laminated piezoelectric body 41 as described above, as shown in FIG.
is attached directly to the gimbal spring 26 as shown in FIG.
The tip can also be fixed.

FIG. 11 shows a case in which ultrasonic vibration is applied to the magnetic head 32 in the magnetic card device explained in FIG. 4. In this embodiment, for example, as shown in FIG. This is a structure in which a laminated piezoelectric material 41 (the same applies to the high magnetostrictive magnetic material 49 in FIG. 6) is interposed.

In the above configuration, when the laminated piezoelectric body 41 is operated, the laminated piezoelectric body 41 expands and contracts in the vertical direction, and the laminated piezoelectric body 41
A magnetic head 32 fixed to the lower surface of the magnetic card 31 vibrates ultrasonically perpendicular to the surface of the magnetic card 31.

In the case of a magnetic card device, it is also possible to have a structure in which the tip end of the movable part 45, 48, or 54 is fixed to the lower part of the presser spring 33, as in the above-described FIG. 9(b).

[Effects of the Invention] Since the present invention is configured as described above, the following effects are achieved.

Since the magnetic head vibrates ultrasonically in a direction perpendicular to the surface of the magnetic recording medium, the magnetic head, magnetic field, and recording medium collide (contact) with each other immediately.

This process is repeated to maintain a minute gap between them.9 Therefore, the time that they are in contact with each other is extremely short, and mutual wear is effectively prevented, increasing the reliability of the installation. Gender direction” Nizuro. Further, since wear of the magnetic recording medium and the magnetic head is prevented, the minute gap between them can be set to be -1 minute smaller, and the recording density of the magnetic recording device can be lowered.

[Brief explanation of the drawing]

1 to 4 show specific examples of magnetic recording devices to which the present invention is applied. FIG. 1 is a side view of the main parts of a magnetic tape device, and FIG. 2 is a side view of the main parts of a magnetic disk device. Figure 3 (A) is a perspective view of the main parts of the floppy disk device, 31ffi (B) is an enlarged view of the main parts of Figure 3 (A), and Figure 4 is the main part of the magnetic card device. Perspective view of 5th
Figures to 7 [1] do not show an embodiment of the ultrasonic vibration generator according to the present invention, and Figure 5 [a perspective view of the ultrasonic vibration generator of the Al-1 piezoelectric element r type, Figure 6]. is a perspective view of a magnetostrictive element type ultrasonic vibration generator.
A perspective view of the wave vibration generator, the 8th “4th]] figure is the 1st [4th]]
--- An actual hh example of the present invention in which the magnetic head is vibrated ultrasonically in each of the 41st T4 magnetic recording devices is: Ffi
Figure 8 is a diagram for a magnetic tape device, and Figure 9 (a) is a diagram for a magnetic disk device. + (B) is a diagram showing another example of the case of the same magnetic disk device, No. 1011 (A) is a diagram of the case of a floppy disk device, and No. 1013 (B) is a diagram of case 8 of the same floppy disk device. (No examples of l [4 1st
FIG. 11 is a diagram of a magnetic card device, FIG. 12 is a block diagram explaining the present invention in detail, and FIG. 13 is a block diagram explaining a conventional magnetic recording device. ■...magnetic chip, 11...magnetic disk, 21...
・Floppy Day 7ζri 31...Magnetic (to card, 2
．． 12, 22.32... Magnetic head, 41 Laminated piezoelectric material, 45, 48.54... Movable part, 49... High magnetostrictive magnetic material, 55... Permanent magnet, 50.56... Coil,
61... Arm, A. Piezoelectric element type ultrasonic vibration generator, B... Magnetostrictive element type ultrasonic vibration generator, C...
・Electromagnetic force type ultrasonic vibration generator. Figure 1

Claims (1)

[Claims] 1. A magnetic recording medium for recording information, a magnetic head that comes into contact with the magnetic recording medium to write or read information on the magnetic recording medium, and a combination of the magnetic recording medium and the magnetic head. and a drive mechanism for relatively moving the magnetic recording medium, the magnetic recording device comprising an ultrasonic vibration applying means for applying ultrasonic vibration in a direction perpendicular to the surface of the magnetic recording medium to the magnetic head. Device. 2. The magnetic recording device according to claim 1, wherein the ultrasonic vibration applying means includes an ultrasonic vibration generator that generates ultrasonic vibrations by causing a piezoelectric element to expand and contract with an alternating voltage. 3. The magnetic recording device according to claim 1, wherein the ultrasonic vibration applying means includes an ultrasonic vibration generator that generates ultrasonic vibrations by causing a magnetostrictive element to expand and contract with an alternating magnetic field. 4. The ultrasonic vibration applying means attaches a coil to one of the fixed part or the movable part, and a magnet that applies a magnetic field to the coil to the other, and generates an electromagnetic force acting on the coil or magnet when a high frequency current is passed through the coil. 2. The magnetic recording device according to claim 1, further comprising an ultrasonic vibration generator for generating ultrasonic vibrations. 5. The magnetic recording device according to claim 1, 2, 3 or 4, wherein the magnetic recording medium is a tape. 6. The magnetic recording device according to claim 1, 2, 3 or 4, wherein the magnetic recording medium is a magnetic disk. 7. The magnetic recording device according to claim 1, 2, 3 or 4, wherein the magnetic recording medium is a floppy disk. 8. The magnetic recording device according to claim 1, 2, 3 or 4, wherein the magnetic recording medium is a magnetic card.