JPH02149914A - 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 a driving mechanism. CONSTITUTION:The ultrasonic vibration impressing means A which adds the ultrasonic vibration in the vertical direction to the surface of the magnetic recording medium to the driving mechanism is provided. When the ultrasonic vibration generation device A is operated, the movable part 45 thereof is vibrated and an arm and a cylinder 4 supported by the tip of the arm which are integrated in the movable part 45 are vibrated in ultrasonic. Due to that, the magnetic head 2 attached to the cylinder 4 is vibrated in ultrasonic almost in the vertical direction to the surface of a magnetic tape 1 at a greater part where the magnetic head 2 comes into contact with the 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 from occurring and the recording density of a magnetic recording device is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention uses a magnetic recording medium such as a magnetic tape, a magnetic disk (hard disk), a floppy disk, or a magnetic card as a recording medium to read information using a magnetic head. 9. Related to a magnetic recording device that performs reading or reading [Prior art] In general, a magnetic recording device, as shown in the block diagram in FIG. 2. It consists of a magnetic head for writing or reading information, a drive mechanism for relatively moving the magnetic head along one surface of the magnetic recording medium, and electronic circuits for controlling various parts and processing information. There is.

As the magnetic recording medium, a magnetic tape, a magnetic disk (hard disk), a floppy disk, a magnetic card, etc. are used. With a magnetic head.

In this case, a coil wound around a high permeability magnetic core with a small gap is used. As the driving machine t, a rotary motor or a linear actuator is used. The electronic circuits include a magnetic head drive circuit, a drive mechanism drive circuit, a circuit for processing information and ensuring reliability, and the like.

All conventional magnetic recording devices of this type have a structure in which the magnetic head and the magnetic recording medium move relative to each other only in a direction parallel to the surface of the insert pin.

[Problem to be Solved by the Invention 1] - In a conventional magnetic recording device, when the magnetic head moves along the surface of the magnetic recording medium (11 pairs) to perform writing/reading, this relative movement is usually ), a minute gap is created between the magnetic head and the magnetic recording medium, and this minute gap prevents wear of the magnetic head and magnetic recording medium.
It has a soothing effect. However, the recording density of a magnetic recording device is 1-6. Therefore, if the recording density is increased/the microgap between the temples is set small, wear will occur during the relative movement between the magnetic recording medium and the magnetic head, and the reliability of the entire device will be lost. There is a problem with putting it away.

By the way, in a magnetic disk drive, in order to prevent a phenomenon in which the magnetic head is in close contact with the magnetic disk and cannot be separated from it (a condition called adhesion), and the magnetic disk does not start moving at startup, 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 disk in order to separate the magnetic head from the surface of the magnetic disk. Vibration in the direction parallel to the medium plane.

Since it is applicable only at the time of start-up and does not involve the minute gap between the magnetic recording medium and the magnetic head, it cannot solve the problem described in ".".

The present invention has been made in view of the above-mentioned circumstances, and it maintains a minute gap between a magnetic recording medium and a magnetic head sufficiently small.
An object of the present invention is to provide a magnetic recording device that can increase the recording density while simultaneously preventing wear on the magnetic recording medium and magnetic head.

[Means for Solving the Problems] In order to solve the problems described in +-0, the present invention provides a magnetic recording medium for recording information, and a contact with the magnetic recording medium.
A magnetic head that writes information to or reads information from a magnetic recording medium, and a magnetic head that writes information to or reads information from a magnetic recording medium. A drive mechanism for relatively moving the magnetic recording medium and the magnetic head.
In this magnetic recording device, an ultrasonic vibration applying means for applying ultrasonic vibration in a direction perpendicular to the surface of the magnetic recording medium is provided on the drive shaft.

Note that the drive mechanism as used in the present invention refers to a mechanism that moves the magnetic recording medium and the magnetic head relative to each other in the track direction (--the longitudinal direction of the rack). So, in this drive mechanism,
There are those that drive the magnetic head side and those that drive the magnetic recording medium side.

[Function] In the above configuration, since the drive mechanism that moves the magnetic recording medium and the magnetic head relative to each other vibrates ultrasonically in a direction perpendicular to the surface of the magnetic recording medium, the magnetic recording medium supported by this drive mechanism or The magnetic head is subjected to ultrasonic vibration I7 in a direction perpendicular to the surface of the magnetic recording medium, and when the magnetic head and magnetic recording medium collide with each other, they are immediately repelled from each other and separated, and this process is repeated to close the minute gap between them. maintain.

Therefore, the time that the magnetic recording medium and the magnetic head are apart from each other is longer than the time that they are in contact with each other, and 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 sufficiently small, 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 in FIG. 12, the present invention includes an ultrasonic vibration applying means for applying ultrasonic vibration in a direction perpendicular to the surface of the magnetic recording medium to a drive mechanism that relatively moves the magnetic recording medium and the magnetic head. It was established.

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

FIG. 1 shows a side view of the main part of a magnetic tape device such as a VTR or R-DAT, that is, a magnetic recording device whose magnetic recording medium is a magnetic tape. In the figure, 1 is a magnetic tape which is a magnetic recording medium, and 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 rotating motor 7, the upper rotating cylinder 6, and other mechanisms for rotationally driving the magnetic head 2 constitute a driving mechanism that moves the magnetic head 1 relative to the magnetic tape 2 in the track direction. Note that although the tape running mechanism that drives the magnetic tape 1 also moves the magnetic tape and the magnetic head relative to each other, this tape running mechanism is not included in the drive mechanism as referred to in the present invention.

FIG. 2 is a perspective view showing the main parts of a magnetic disk device, that is, a magnetic recording device whose magnetic recording medium is a magnetic disk (hard disk), in which 11 is a magnetic disk;
2 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 portion to which the magnetic head 12 is attached has a horizontal U-shape. The arm 15 is a linear actuator 17 for moving the head.
It is driven back and forth 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 mechanism for rotationally driving the magnetic disk 11, such as the rotary motor 14 and spindle 13, moves the magnetic disk 11 and the magnetic head 12 relatively in the track direction. Configure a drive mechanism to do this.

Figure 3 (A) is a perspective view of the main parts of a floppy disk device, that is, a magnetic recording device whose magnetic recording medium is a floppy disk. 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 attached to a gimbal spring 26 attached to an arm 25.This gimbal spring 26 As shown in an enlarged view in FIG. 3(B), the edge is fixed to a hole 25a made at the tip of the arm 25, and the magnetic head 22 has a shape that supports four points around the magnetic head 22 at front, rear, left and right. The arm 25 is not only capable of elastic deformation in the direction perpendicular to the medium surface in order to flexibly support the magnetic head 22, but also slightly elastic deformation in the horizontal direction to prevent damage to the magnetic head. Similarly to the above, it is reciprocated in the horizontal direction of the arrow by a linear actuator 27 for head feeding, such as a step motor or a voice coil motor.Mechanisms for rotationally driving the floppy disk 21, such as the rotary motor 24 and spindle 23, include: A drive Sa mechanism is configured to relatively move the floppy disk 21, magnetic head 22, etc. in the track direction.

FIG. 4 shows a perspective view of a main part of a magnetic card device, that is, a magnetic recording device in which the magnetic recording device is a magnetic card. In the figure, 31 is a magnetic card and 32 is a magnetic head. The magnetic head 32 is attached to a horizontal U-shaped presser spring 33 that is fixedly attached to the main body of the device.
A feed roller 4 drives the magnetic card 31 and constitutes a drive mechanism that moves the magnetic card 31 and the magnetic head 32 relative to each other. Numeral 35 is a pad, which is arranged on the back surface of the magnetic card 31, facing the magnetic head 32.

Next, the ultrasonic vibration generator; η for generating ultrasonic vibrations applied to each of the above-mentioned drive mechanisms will be explained.

FIG. 5 shows a piezoelectric element type ultrasonic vibration generator Δ. This ultrasonic vibration generator A uses a laminated piezoelectric material 41.1. The second laminated piezoelectric body 41 has a structure in which a plurality of piezoelectric bodies 42 made of lead zirconate titanate or the like are laminated in layers with one electrode 43 in between. 44 is a fixing part that fixes the laminated piezoelectric body 41-. 45 is a laminated piezoelectric body 41
It is a rigid movable part that transmits ultrasonic vibrations to the vibrating target, and is fixed in a cantilevered manner to the soil 6 surface of the laminated piezoelectric material 41.

A high frequency power source 4 that applies a voltage to the laminated piezoelectric body 4
G is, for example, a frequency of 20 KHz, and a voltage of 1
The voltage should be approximately 0-.~100OV.

The laminated piezoelectric material 4 is driven by a high-frequency power source to expand and contract in the thickness direction, and the movable portion 45 causes ultrasonic vibrations in the vertical direction as shown by the arrow.

In addition, the object to be excited is fixed directly to the top surface of the laminated piezoelectric body 41 described in 1. -1, it is of course possible to directly vibrate the object to be vibrated by the laminated piezoelectric body 41.

FIG. 6 shows a magnetostrictive element type ultrasonic vibration generator B. This ultrasonic vibration generator B has a base end portion of a movable portion 48 of a plate spring fixed to a support base 47 fixed to a fixed portion 44, and a base end portion of a movable portion 48 of a leaf spring fixed to a fixed portion 46, for example, made of FeCo-8i-8 alloy. The upper surface parts of the four high magnetostrictive magnetic bodies are connected to the back surface of the movable part 48, and a coil 50 surrounding the high magnetostrictive magnetic bodies 49 is provided.

A high frequency power source 51 is connected to this coil 50. This high frequency power source 51 has a frequency of 20 KHz or more and a current of several meters, for example.
A - Loser A grade. The highly magnetostrictive magnetic material 49 expands and contracts under the action of the alternating magnetic field generated by the high frequency current flowing through the coil 50, causing the tip of the movable part 18, which is a leaf spring, to vibrate ultrasonically up and down as shown by the arrow. do.

In the case of this magnetostrictive element type, the object to be vibrated can also be directly fixed to the magnetostrictive element and vibrated directly.

FIG. 7 shows an electromagnetic force type ultrasonic vibration generator C that utilizes electromagnetic force due to the action of a magnetic field and current. This ultrasonic vibration generator C is a fixed part! ″) Fixed to 2 1..

The proximal end of the movable part 54 of the plate is fixed to the support stand 53,
4: A permanent magnet 55 such as a barium ferrite, an alnico magnet, or a rare earth-Co magnet is fixed to the lower surface of the movable part 54 (the permanent magnet 55 is floating above the fixed part 52), and on the other hand, the above-mentioned magnet is fixed to the fixed part 52 side. Coil 56 into which permanent magnet 55 is inserted
The permanent magnet 55 generates a horizontal magnetic field, and although not shown, the coil 56
It is preferable to arrange a yoke (fixed to the movable part 54) on the outside of the movable part 54. The coil 5G is fixed to the fixed part 52 and wound around a bobbin (not shown). A high frequency current flows through the coil 56,
Then, the current flowing through the coil 56 and the magnetic field from the permanent magnet 55 act, and an electromagnetic force according to Fleming's left hand rule is generated between the coil 56 and the permanent magnet 55. However, since the coil 5G is fixed, the permanent magnet 55 side, that is, the movable part 5
4 vibrates up and down and generates ultrasonic vibrations. In addition,
The amplitude of the vibration produced by the ultrasonic vibration generator described in "-2" below is approximately several hundred λ/-several μm.

Next, employ the above-mentioned ultrasonic vibration generators A, B, and C.j2
A specific example will be described in which ultrasonic vibrations in a direction perpendicular to the surface of the magnetic recording medium are applied to the drive mechanism of each magnetic recording device.

FIG. 8 shows the drive mechanism in the magnetic tape device explained in FIG. In the figure, 60 is a guide roller for guiding the magnetic tape 1 wound around the cylinder 6, 61 is the shaft of the cylinder 4, and 2
is the aforementioned magnetic head. In this embodiment, the shaft 61 of the cylinder 4 is attached to the tip of an arm 62 that is substantially parallel to the direction in which the two guide rollers 60 are lined up, and the base end of this arm 62 is a piezoelectric element type superstructure shown in FIG. The movable part 45 in the sonic vibration generator A or the movable part 4 in the magnetostrictive cord type ultrasonic vibration generator B shown in FIG.
8 or the movable portion 54 of the electromagnetic force type ultrasonic vibration generator C shown in FIG. The direction of vibration of the movable part is perpendicular to the direction in which the two guide rollers 60 are lined up, as shown by the arrow.

In the magnetic recording device having the above configuration, when the ultrasonic vibration generator A, B or C is activated, the movable parts 4
5 or 48 or 54 vibrates, and the arm 61 integrated with the movable part 45 or 48 or 54 and the cylinder 4 supported at its tip vibrate ultrasonically in the direction of the arrow in FIG. The attached magnetic head 2 vibrates ultrasonically in a direction generally perpendicular to the surface of the magnetic tape 1 in most of the area where it contacts the magnetic tape 1. Note that the vibration of the cylinder 4 described above is the vibration of the entire cylinder including the lower fixed cylinder 5, the upper rotating cylinder 6, and the rotating motor 7. Therefore, the rotating motor 7 is attached to the chassis 3 so as to be horizontally displaceable. However, the upper rotating cylinder 6 is several micrometers from the lower fixed cylinder 5.
Only the upper rotating cylinder 6 may be ultrasonically vibrated as long as it can be horizontally displaced within the following range.

FIG. 9 shows a case in which ultrasonic vibrations are applied to the drive mechanism of the magnetic disk device shown in FIG. 2, that is, the rotary motor 14 and the spindle 13.

In the figure, 70 is a chassis, and the above-mentioned rotary motor 14
is fixed to this chassis 70. In this embodiment, the movable part 45, 48, or 54 of the ultrasonic vibration generator A, B, or C described above is connected to a chassis 70 to which the rotary motor 14 is fixed. The direction of vibration of the movable part is the vertical direction in the figure.

In the above configuration, when the ultrasonic vibration generators A, B, or C are activated, their movable parts 45, 48, or 54 vibrate, and the movable parts 45, 48, or 5
The chassis 7o integrated with the chassis 70 vibrates vertically, the rotary motor 14 and the spindle 13 vibrate vertically together with the chassis 70, and the magnetic disk 11 fixed to the spindle 13 vibrates in a direction perpendicular to its surface. Sound waves vibrate.

In the above embodiment, the chassis 7o is vibrated, but the rotary motor 14 is, for example, a laminated piezoelectric body 41 shown in FIG.
Alternatively, the chassis 7 can be
0, and this laminated piezoelectric material 41 or high magnetostrictive magnetic material 4
It is also possible to directly vibrate the rotary motor 14 etc. at 9.

FIG. 10 shows a case in which ultrasonic vibration is applied to the drive mechanism of the floppy disk device described in FIG. 3, that is, the rotary motor 24 and the spindle 23. The zero-rotation motor 24 is fixed to the chassis 8o. In this embodiment, the movable part 45, 48, or 54 of the ultrasonic vibration generator A, B, or C described above is connected to a chassis 80 to which the rotary motor 24 is fixed. The direction of vibration of the movable part is the vertical direction in the figure.

The operation of this floppy disk device is similar to that of the magnetic disk device shown in FIG. The floppy disk 21 supported by the floppy disk is subjected to ultrasonic vibration in a direction perpendicular to its surface.

FIG. 11 shows the drive mechanism in the magnetic card device explained in FIG. 4, that is, the case where ultrasonic vibration is applied to the feed roller 34. As shown in FIG.
o, and this arm 90 is fixed to the movable part 45, 48, or 54 of the ultrasonic vibrator A, B, or C shown in FIGS. 5 to 7.

In the above configuration, when the ultrasonic vibration generator A, B, or C is activated, the arm 9o fixed to the movable part 45, 48, or 54 vibrates up and down, and the sending port-ra 90 that holds the magnetic card 31 therebetween vibrates. vibrates, so the magnetic card 3] vibrates ultrasonically in a direction perpendicular to the plane U of ().

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

The drive mechanism that moves the magnetic recording medium and the magnetic head relative to each other vibrates ultrasonically in a direction perpendicular to the surface of the magnetic recording medium, so that the magnetic recording medium or the magnetic head supported by this drive mechanism is aligned with the surface of the magnetic recording medium. Ultrasonic vibration in the vertical direction 1: This causes the magnetic head and magnetic record jj! When the media come into contact with each other, they are immediately repelled from each other and keep repeating this process, maintaining a minute gap between them. Therefore, the time during which the two are in contact with each other is extremely short, and mutual wear between the two is effectively prevented, thereby improving the ease of use of the device. Furthermore, since wear of the magnetic recording medium and the magnetic head is prevented, it is possible to set the minute gap between the two to be sufficiently small, and the recording density of the magnetic recording device can be improved.

[Brief explanation of the drawing]

Figure 1 Figure 4 shows specific examples of magnetic recording devices to which the present invention is applied. Perspective view of the main parts of the device Figure 3 (A) is a perspective view of the main parts of the floppy disk device, Figure 31 (B) is an enlarged view of the main parts of Figure 3 (A), and Figure 4 is a magnetic card. Perspective views of main parts of the device, No. 514 to No. 71.7I show embodiments of the ultrasonic vibration generator according to the present invention, and Fig. 5 shows a piezoelectric element type ultrasonic vibration generator. 6 is a perspective view of a magnetostrictive element type ultrasonic vibration generator; FIG. 7 is a perspective view of an electromagnetic force type ultrasonic vibration generator that utilizes electromagnetic force due to the action of a magnetic field and current; 8 to 11 show an embodiment of the present invention in which the drive Ill structure is vibrated ultrasonically in each magnetic recording device shown in FIG. 4)1. 8 is a diagram of j% & of a magnetic tape device, FIG. 9 is a diagram of a magnetic disk device, FIG. 10 is a diagram of a digital disk device, and FIG. Figure 11 is a diagram for the case of a magnetic card device, Figure 12
The figure is a block diagram explaining the present invention in detail, and FIG. 13 is a block diagram explaining a conventional magnetic recording device. Fig. 1 1... Magnetic tape, 4... Cylinder (driver 111
), 1]... Magnetic disk, 13.23... Spindle, 14°24... Rotating motor (drive mechanism), 21
...Floppy disk, 31...Magnetic card, 2
．． 12, 22. 32... Magnetic head, 41... Laminated piezoelectric material, 45, 48. 54... Movable part, 4... High magnetostrictive magnetic material, 55... Permanent magnet, 50.56 ...Coil, 62...Arm, 70.80...Chassis,
90... Arm, A... Piezoelectric element type ultrasonic vibration generator, B... Magnetostrictive element type ultrasonic vibration generator, C
...An electromagnetic force type ultrasonic vibration generator.

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. A magnetic recording device comprising a drive mechanism for relatively moving a magnetic recording medium, the drive mechanism being provided with an ultrasonic vibration applying means for applying ultrasonic vibration in a direction perpendicular to the surface of the magnetic recording medium. 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.