JP2001250293A - Magnetic recording driving device, rotary drum and magntic tape driving device using the drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the wear of a magnetic heady and the sticking of stain. SOLUTION: In a magnetic tape driving device (magnetic recording driving device) for recording/reproducing a signal by bringing magnetic heads 4a and 4b into contact with a magnetic tape (magnetic recording medium) 6, actuators (vibration generating means) 5a and 5b for vibrating the magnetic heads very slightly are included.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording drive, a rotating drum, and a magnetic tape drive using the same. More specifically, the present invention relates to a technique for reducing the wear of a magnetic head and the attachment of stains by microvibrating a magnetic head.

[0002]

2. Description of the Related Art There is a so-called contact type magnetic recording drive device in which a magnetic head is brought into contact with a magnetic recording medium for recording / reproducing a signal.

As such a drive device, there are a magnetic tape drive device using a recording medium as a magnetic tape and a magnetic disk drive device using a recording medium as a magnetic disk. Magnetic tape drive devices include a fixed head type drive device in which a magnetic head is fixed and a rotary drum type drive device in which a magnetic head is mounted on a rotary drum. Flexible magnetic disk devices and hard disk drive devices with hard magnetic disks.

[0004] In any of the magnetic recording drive devices, recording / reproducing is performed by moving the magnetic head relatively to the magnetic recording medium in contact with the magnetic recording medium, and there is always a gap between the magnetic head and the recording medium. , Friction is occurring. Strictly speaking, since the recording medium has minute irregularities, the two repeat contact and separation within a minute gap.

[0005]

However, in such a contact type magnetic recording drive device, since the magnetic head runs relatively while contacting the recording medium, friction always occurs between the two. However, there is a problem that the magnetic head is worn.

Further, in the magnetic head, magnetic powder, dust, and the like, which fall off due to friction of the magnetic recording medium, are denatured by heat or the like and are generated as deposits (hereinafter referred to as stains), thereby deteriorating electromagnetic conversion characteristics. There is also a problem.

[0007]

In order to solve the above-mentioned problems, a magnetic recording drive device according to the present invention is provided with vibration generating means for causing a magnetic head to vibrate minutely.

Therefore, according to the magnetic recording drive of the present invention, since the vibration generating means for microvibrating the magnetic head is provided, the contact position and the contact pressure between the magnetic head and the magnetic recording medium can be varied. The friction between the two can be reduced, so that the wear of the magnetic head can be reduced and the attachment of stain to the magnetic head can be reduced.

Further, the rotary drum of the present invention supports the magnetic head on the rotary drum via an actuator and has an oscillator for minutely oscillating the actuator. The contact position and contact pressure with the magnetic tape can be varied, and the friction between them can be reduced, so that the wear of the magnetic head can be reduced and the adhesion of stain to the magnetic head can be reduced. Can be done.

Further, in the magnetic tape drive of the present invention, the magnetic head is supported on the rotating drum via the actuator, and the oscillator for micro-vibrating the actuator is provided. The contact position and contact pressure between the head and the magnetic tape can be varied, so that friction between them can be reduced, so that wear of the magnetic head can be reduced and stain on the magnetic head can be reduced. Can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

The magnetic recording drive described in the following embodiment is a magnetic recording drive applied to a magnetic tape drive in which a magnetic head is mounted on a rotating drum using a magnetic recording medium as a magnetic tape.

The rotating drum 1 has, for example, a diameter φ of 4
0 mm, the rotor side drum 2 and the stator side drum 3
(See FIG. 1), a plurality of magnetic heads 4a and 4b are provided on the rotor side drum 2, and these magnetic heads 4a and 4b are separately supported by actuators 5a and 5b composed of piezoelectric elements (piezoelectric displacement elements). Have been. The actuators 5a and 5b function as vibration generating means for generating a vibration by supplying a variable frequency thereto. Further, the magnetic heads 4a and 4b include a recording magnetic head and a reproducing magnetic head, and each may have one, two, or different numbers. Further, when two or more magnetic heads of the same quality are provided, the azimuth angles are made different.

The magnetic heads 4a and 4b are arranged so as to slightly protrude from the outer peripheral surface of the rotary drum 1, and the amount of protrusion is
For example, it is set to several μm to several tens μm.

A magnetic tape 6 is wound around the rotary drum 1 at a predetermined winding angle.
Is sent in a fixed direction by a tape traveling device (not shown).

On the other hand, the rotary drum 1 is rotated in a direction different from the running direction of the magnetic tape 6, whereby each of the magnetic heads 4 a and 4 b scans the magnetic tape 6 by helical scanning, and sends a signal to the magnetic tape 6. Recording / reproduction is performed.

The contact pressure of the magnetic tape 6 with respect to the magnetic heads 4a and 4b is determined by the amount of protrusion of the magnetic heads 4a and 4b, the reaction force due to the tape tension of the magnetic tape 6 and the rigidity of the magnetic tape 6, and the rotation of the rotary drum 1. Determined by the levitation force of the magnetic tape 6 by the formed air film,
The spacing (spacing amount) between the magnetic heads 4a and 4b and the magnetic tape 6 is usually set to several tens nm to 100 nm.

The magnetic heads 4a and 4b and the magnetic tape 6 have minute irregularities on their respective surfaces, and these irregularities are both 10 nm to several tens of nm. As a result, the vehicle travels while repeating partial contact, and so-called contact-based magnetic recording / reproduction is performed.

A rotary transformer 7 is provided between the rotor-side drum 2 and the stator-side drum 3 to transmit various signals and power. The signals include drive signals for driving the actuators 5a and 5b described later.

The actuators 5a and 5b vibrate the magnetic heads 4a and 4b in a direction protruding from the outer peripheral surface of the rotary drum 1 by a drive signal supplied through the rotary transformer 7. The amount of protrusion of the magnetic heads 4a and 4b from the outer peripheral surface of the rotary drum 1 changes, and the magnetic tape 6 runs relatively to the magnetic heads 4a and 4b.
Causes the contact point and contact pressure with the magnetic tape 6 to constantly fluctuate.

Therefore, the coefficient of friction between the magnetic heads 4a, 4b of such a contact system and the magnetic tape 6 is reduced, and the wear of the magnetic heads 4a, 4b and the magnetic tape 6 is reduced. Adhesion of stain to 4b is reduced.

The vibration frequency of the actuators 5a and 5b is, for example, 1 kHz or more and 10 kHz, preferably 5 kHz.
It is set to 0 kHz.

When the vibration frequency of the actuators 5a and 5b is set to be equal to or less than the rotation speed of the rotary drum 1, the magnetic heads 4a and 5b
Since the vibrations (fluctuations) of the magnetic heads 4a and 4b may not be transmitted to the magnetic tape 6 at least once while the magnetic tape 4b is in contact with the magnetic tape 6, at least at a frequency higher than the rotation speed of the rotary drum 1. It is necessary to vibrate the actuators 5a and 5b.

In general, it is easier to generate a low frequency than to generate a high frequency. However, since an element (oscillator) for generating a low frequency is large, when this element is mounted on the rotor-side drum 2 of the rotary drum 1, the rotation-side Considering that the weight of the member increases and the efficiency of transmitting low-frequency signals via the rotary transformer 7 is low, the vibration frequency is preferably high to some extent. Vibration frequency of 10 times or more of the number of rotations is preferable. Therefore, the rotation speed of the rotating drum 1 is usually 30 Hz (1800 rpm) to 200 Hz in frequency conversion.
(12000 rpm), the actuator 5
The vibration frequencies of a and 5b are 0.3 kHz to 2 kHz.

Further, in consideration of realistic signal transmission, the vibration frequency of the actuators 5a and 5b is 10 k
Hz or higher, and more preferably 50 kHz or higher. However, the vibration frequencies of the actuators 5a and 5b are determined in consideration of resonance with other members.

The amplitude (fluctuation amount) of the actuators 5a and 5b is preferably 50 nm or less in order to maintain the spacing amount (several tens nm) or less. Since the actuators 5a and 5b are piezoelectric elements, for example,
If the displacement amount is 1 μm when the driving power of 100 V is supplied, the driving power of 5 V is 50
nm displacement can be obtained.

In this embodiment, a case has been described in which the actuators 5a and 5b are piezoelectric elements. However, the present invention is not limited to this. For example, an electrostatic actuator (capacitance displacement element) may be used. May be. In the case of an electrostatic actuator, a finer vibration can be realized as compared with a piezoelectric element, and power can be saved.

FIG. 3 shows a circuit for driving the actuators 5a and 5b. In the drive circuit 8, an oscillator 9 for oscillating the actuators 5a and 5b is provided on a fixed member (for example, the stator drum 3). The oscillator 9
Is amplified by the amplifier 10, supplied to the stator-side element 7s of the rotary transformer 7, and transmitted to the rotor-side element 7r.

Rotor-side element 7 of rotary transformer 7
The signal transmitted to r is supplied to the actuators 5a and 5b via the drive amplifier 11.

As a result, the magnetic heads 4a and 4b supported by the actuators 5a and 5b vibrate slightly in the direction in which they protrude from the outer peripheral surface of the rotary drum 1, and the magnetic heads 4a and 4b And the contact pressure is constantly fluctuating.

Actuator 5 in this embodiment
Since the oscillator 9 that oscillates an oscillation signal of a predetermined variable frequency supplied to a and 5b is provided on the fixed member (stator drum 3), it can contribute to the weight reduction of the rotating member (rotor drum 2). As a result, the size of the entire apparatus can be reduced.

FIG. 4 shows a modification of the driving circuit 8 for the actuators 5a and 5b. The driving circuit 8A of this modification is shown in FIG.
Is a device in which an oscillator for oscillating the actuators 5a and 5b is disposed on the rotor drum 2 of the rotary drum 1.

The drive circuit 8A according to this modification is configured such that the stator-side element 7s of the rotary transformer 7 includes an amplifier 12
And is connected to the oscillation circuit 13 to transmit a power signal to the rotor-side element 7r.

Rotor-side element 7 of rotary transformer 7
The power signal transmitted to the r is supplied to the oscillator 15 via the rectifier 14, the oscillator 15 generates a signal having a predetermined fluctuation frequency, and the oscillation signal is transmitted to the actuators 5 a and 5 b via the drive amplifier 16. Supply.

Thus, similarly to the rotary drum 1 described in the above embodiment, the magnetic heads 4a and 4b supported by the actuators 5a and 5b are minutely vibrated in a projecting direction from the outer peripheral surface of the rotary drum 1. That is, the magnetic heads 4a and 4b constantly change the contact position and the contact pressure with the magnetic tape 6.

In the drive circuit 8A according to this modification, the oscillator 15 for oscillating an oscillation signal of a predetermined variable frequency to be supplied to the actuators 5a and 5b is provided on the rotating member (the rotor drum 2). In the rotary transformer 7, only the power needs to be transmitted, and the control is facilitated.

In the above-described embodiment, the vibration directions of the magnetic heads 4a and 4b are described so as to be displaced in a direction protruding from the outer peripheral surface of the rotary drum 1. Is not limited to this.
Alternatively, the magnetic tape 6 may be vibrated in the track width direction (FIG. 5), or may be vibrated in the running direction of the magnetic tape 6 (FIG. 6).

When the magnetic heads 4a and 4b are vibrated in the track width direction, the track pitch is usually 10 μm, and when this is taken into consideration, the amplitude of the vibration is 50 nm.
It is good to In this way, it is possible to realize the minute vibration of the magnetic heads 4a and 4b without affecting the tracking servo.

The track pitch tends to decrease with the increase in recording density. In this case, if the amplitude of the vibration is set to 50 nm or less, the track pitch becomes 1 μm or 500 nm. No problem such as tracking error occurs. Of course, in this case,
The amplitude may be made smaller.

In the above-described embodiment, the magnetic recording drive of the present invention has been described as a recording medium using a magnetic tape. However, the present invention is not limited to this, and a flexible disk or a hard disk may be used. ,
A magnetic recording medium may be used as the recording medium as long as it is a contact type.

Further, in the above-described embodiment, the magnetic head is applied to a so-called rotary head mounted on a rotary drum, but the present invention is not limited to this.
The magnetic head can be applied to a so-called fixed head.

Further, the specific shapes and structures of the respective parts shown in the above-described embodiment and each modified example are merely examples of the embodiment in carrying out the present invention, and the present invention is not limited thereto. The technical scope of the invention should not be construed as being limited.

[0043]

As described above, the magnetic recording drive device of the present invention is a magnetic recording drive device for recording / reproducing a signal by bringing a magnetic head into contact with a magnetic recording medium. A vibration generating means for causing the head to vibrate minutely is provided.

Therefore, according to the magnetic recording drive of the present invention, since the vibration generating means for microvibrating the magnetic head is provided, the contact position and the contact pressure between the magnetic head and the magnetic recording medium can be varied. The friction between the two can be reduced, so that the wear of the magnetic head can be reduced and the attachment of stain to the magnetic head can be reduced.

Further, the rotary drum according to the present invention is a rotary drum provided with a magnetic head for recording / reproducing a signal on / from a magnetic tape. An oscillator is provided.

Therefore, according to the rotating drum of the present invention, the magnetic head is mounted on the actuator and the oscillator for causing the actuator to vibrate minutely is provided.
By slightly vibrating the magnetic head, the contact position and contact pressure between the magnetic head and the magnetic tape can be changed, the friction between them can be reduced, and the wear of the magnetic head can be reduced. At the same time, the adhesion of stains to the magnetic head can be reduced.

Further, the magnetic tape drive of the present invention is a magnetic tape drive in which a magnetic head for recording / reproducing a signal on / from a magnetic tape is provided on a rotary drum, and the magnetic head is mounted on an actuator. An oscillator for microvibrating the actuator is provided.

Therefore, according to the magnetic tape drive of the present invention, the magnetic head is mounted on the rotating drum via the actuator and the oscillator for micro-vibrating the actuator is provided. The contact position and contact pressure between the magnetic head and the magnetic tape can be varied, the friction between them can be reduced, and the wear of the magnetic head can be reduced, and the stain on the magnetic head can be reduced. Can be reduced.

According to a fourth aspect of the present invention, in the magnetic tape drive of the present invention, an oscillator for microvibrating the actuator is provided on a fixed member, and a signal from the oscillator is transmitted to the actuator by a rotary transformer. Therefore, it is possible to contribute to the weight reduction of the rotation side member, and it is possible to reduce the size of the entire apparatus.

[Brief description of the drawings]

FIG. 1 shows an embodiment in which the magnetic recording drive of the present invention is applied to a magnetic tape drive together with FIGS. 2 and 3, and FIG. 1 is a perspective view schematically showing a rotating drum.

FIG. 2 is a schematic plan view of a rotor-side drum.

FIG. 3 is a schematic circuit diagram of a drive circuit.

FIG. 4 is a circuit diagram showing a modified example of the drive circuit.

FIG. 5 shows a modification of the vibration direction of the magnetic head.
FIG. 3 is a recording pattern diagram schematically showing tracks recorded on a magnetic tape.

FIG. 6 is a recording pattern diagram schematically showing a track recorded on a magnetic tape, showing another modification of the vibration direction of the magnetic head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotary drum, 3 ... Stator side drum (fixed side member), 4a, 4b ... Magnetic head, 5a, 5b ... Actuator (vibration generating means), 6 ... Magnetic tape (magnetic recording medium), 7 ... Rotary transformer, 9 ... oscillator, 15 ... oscillator

Claims (4)

[Claims] 1. A magnetic recording drive device for recording / reproducing a signal by bringing a magnetic head into contact with a magnetic recording medium, wherein a vibration generating means for microvibrating the magnetic head is provided. A magnetic recording drive device characterized by the above-mentioned. 2. A rotary drum having a magnetic head for recording / reproducing a signal on / from a magnetic tape, wherein the magnetic head is supported by the rotary drum via an actuator, and is used for causing the actuator to vibrate minutely. A rotating drum provided with an oscillator. 3. A magnetic tape drive device provided with a magnetic head for recording / reproducing a signal on / from a magnetic tape on a rotary drum, wherein the magnetic head is supported by the rotary drum via an actuator, and A magnetic tape drive device provided with an oscillator for causing minute vibration of the magnetic tape. 4. The magnetic tape drive device according to claim 3, wherein an oscillator for causing the actuator to slightly vibrate is provided on a fixed member, and a signal from the oscillator is transmitted to the actuator by a rotary transformer. A magnetic tape drive device characterized by the above-mentioned.