JPH08212617A - Magnetic head device - Google Patents

Abstract

PURPOSE: To realize the recording of a high transfer rate signal by a magnetic field modulated recording system. CONSTITUTION: This device is provided with a slider 6 advancing and retreating in the disk radial direction corresponding to the recording surface (d) of a magneto-optical disk D at a disk loading position, and a magnetic head 8 attached to the slider 6 and having a head core 9 and a magnetic coil, and a fan 18 sending air to the head 8 is installed in the device. Since the head 8 is cooled by air sent by the fan 18 which is driven, the temperature of the head core 9 does not get high as in the conventional case, and the magnetic characteristic of the head core 9 is maintained to prevent the lowering of recording efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device suitable for use in a magnetic field modulation overwrite type magneto-optical disk device for recording / reproducing information signals on / from a magneto-optical disk.

[0002]

2. Description of the Related Art In recent years, as means for storing data in a computer or the like, a magneto-optical disk has advantages such as a large data storage capacity, high-speed access, and excellent portability. A recording device using a recording medium has been used.

Up to the present, as a recording apparatus of this type, two types of recording methods, an optical modulation recording method and a magnetic field modulation recording method, have been put into practical use.

Among them, in the recording apparatus of the optical modulation recording system, the drive current of a laser diode used as a means for generating a laser beam for irradiating the magnetic recording material of the magneto-optical disk is modulated, whereby the Curie temperature of the magnetic recording material is changed. The information is recorded by heating up to the point of activation and applying an auxiliary magnetic field to this to change the magnetic field direction of the magnetic recording material.

This optical modulation recording system is suitable for recording a signal of high frequency because the emission characteristic of the laser diode is high in speed. Therefore, a field requiring a high recording rate such as a video signal is required. Is used for.

However, the optical modulation recording method has a problem that overwrite cannot be performed. That is, when new information is recorded on a magneto-optical disk on which information is already recorded, the recorded information must be erased. There is a problem that it must be done, and the processing time at the time of recording becomes long.

Therefore, it is conceivable to shorten the processing time by using not only the information recording head but also the erasing head, but in this case, a plurality of optical blocks are required, which causes a problem of high cost.

Although a recording device by an optical modulation recording system which enables overwriting by using an exchangeable coupling film or the like has been proposed, this has a problem that the structure of the magneto-optical film becomes complicated. However, it has not been put to practical use yet.

On the other hand, in the recording apparatus of the magnetic field modulation recording system, the magnetic field of the magnetic coil is modulated when the magnetic recording material is heated to the Curie temperature and activated by the laser beam, that is, a signal ("1" corresponding to information. , Or “0”), the magnetic field direction of the magnetic coil is reversed,
Information is recorded by changing the magnetic field direction of the magnetic recording material.

In such a recording apparatus, unlike the recording apparatus of the above-mentioned optical modulation recording system, overwriting is possible, so that the processing time can be shortened.

Further, in the recording apparatus of the magnetic field modulation recording system, since the erasing head is unnecessary, the cost can be reduced.

By the way, in the recording apparatus of the magnetic field modulation recording system of this kind, a current having a frequency proportional to the frequency of the information signal is supplied to the magnetic coil for generating the auxiliary magnetic field.

In this case, if the impedance of the magnetic coil is high, the frequency characteristic of the magnetic coil is deteriorated. Therefore, it is necessary to reduce the number of turns of the magnetic coil to lower the impedance.

However, in such a recording device,
If a relatively large current is supplied to the magnetic coil in order to obtain a sufficient magnetic flux for recording, there is a problem that the temperature of the magnetic coil rises due to heat generation and the recording efficiency decreases.

For this reason, a recording apparatus has been studied which enables recording even if the auxiliary magnetic field generated in the magnetic coil is small by bringing the magnetic coil as close as possible to the magneto-optical disk at the disk mounting position.

This is because if recording is possible even if the magnetic field generated in the magnetic coil is small, the current supplied to the magnetic coil can be small, so that heat generation in the magnetic coil is suppressed and recording efficiency is prevented from decreasing. This is because it is considered to be gained.

Conventionally, as this type of recording apparatus, one having a magnetic head device having a flying type magnetic head as shown in FIG. 3 has been adopted.

The magnetic head device of this recording apparatus will be described with reference to the same figure. In the figure, reference numeral 51 is a head carriage that moves forward and backward in the radial direction of the magneto-optical disk D at the disk mounting position, and 52 is on the head carriage 51. A beam having a trapezoidal shape in plan view in which one end of the beam is adhered to a base 53 and cantilevered and the beam width is narrowed from the end on the base side to the end on the side opposite to the base (free end of beam), 54 The slider 54 is elastically held at the beam free end of the load beam 52 through a flexure 55 having a substantially U-shaped cross section, and corresponds to the recording surface of the magneto-optical disc D at the disc mounting position. Flying having a magnetic coil 57 for generating an auxiliary magnetic field and a head core 58 formed by winding the magnetic coil 57. Which is a magnetic head.

Further, 59 is a mounting screw for fixing the base 53 and the load beam 52 to the head carriage 51, and 60 is bent and formed on both side edges of the load beam 52 so as to project to the side opposite to the disk mounting position. It is a rising piece for beam reinforcement.

In the magnetic head device constructed as described above, the slider 54 floats above the recording surface of the magneto-optical disk D by about 10 μm in response to the air flow generated by the rotation of the magneto-optical disk D.

[0021]

However, in the conventional magnetic head device, since it is necessary to suppress the abrasion due to the contact of the slider 54 with the magneto-optical disk D, the slider 54 having a high abrasion resistance such as potassium titanate is used. Since the ceramic material of is used, slider 5
4 has a relatively poor thermal conductivity (the thermal conductivity of the ceramic material is about 0.2 to 0.3 J / cm · s · K), and the heat generated in the magnetic coil 57 by the current supply is generated by the magnetic head 5.
6 (head core 58).

As a result, when the temperature of the head core 58 rises to a high temperature, the recording efficiency decreases due to the deterioration of the magnetic characteristics of the head core 58, and it is impossible to record a high transfer rate signal such as a video signal by the magnetic field modulation recording method. There was a problem.

When the temperature of the head core 58 exceeds the Curie point, no magnetic flux is generated and recording may not be possible.

The present invention has been made in view of the above circumstances, and it is possible to maintain the magnetic characteristics of the head core and prevent a decrease in recording efficiency. Therefore, a high transfer rate signal is recorded by the magnetic field modulation recording method. The present invention provides a magnetic head device that can be used.

[0025]

A magnetic head device according to the present invention is a magnetic head device having a slider that moves in and out in the disc radial direction corresponding to the recording surface of the disc at the disc mounting position, and a magnetic head having a head core and a magnetic coil attached to the slider. The magnetic head is provided with a fan.

[0026]

In the present invention, the magnetic head is cooled by the air blown by the fan when the current is supplied to the magnetic coil.

[0027]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of a magnetic head device according to the present invention.

In FIG. 1, the reference numeral 1 designates a head carriage which moves forward and backward in the radial direction of the magneto-optical disk D at the disk mounting position, and is attached to a movable body (not shown) of a linear motor (not shown). There is.

Reference numeral 2 denotes a sheet metal load beam in which a magnetic head described later is elastically held at one end of the beam, and a base 3 is adhered to the other end of the beam to be supported by the head carriage 1 in a cantilever manner. The plate width is narrower from the beam supporting end toward the beam free end, and is formed by a plate spring having a substantially trapezoidal shape in plan view.

On both side edges of the load beam 2, rising pieces 4 and 5 for beam reinforcement, which project to the side opposite to the disk mounting position, are integrally bent.

Reference numeral 6 denotes a slider corresponding to the recording surface d of the magneto-optical disk D at the disk mounting position, which is elastically held at the beam free end of the load beam 2 through a flexure 7 having a substantially U-shaped cross section. The optical disc D at the disc mounting position can be levitated by the air flow generated by the rotation.

A flying type magnetic head 8 having a head core 9 and a magnetic coil (not shown) is incorporated in the slider 6 and is configured to generate a magnetic field.

The head core 9 of the magnetic head 8 is fused to one end of the slider 6 and the end of the load beam 2 on the supporting side by glass fusion, and the whole of the head core 9 opens toward the disk mounting position side in cross section. It is formed of a substantially U-shaped ferrite material.

On the other hand, in the magnetic coil (not shown) of the magnetic head 8, the coil intermediate portion is wound around the end portion of the head core 9 on the side opposite to the core mounting side, and the end portion of each coil lead wire side is formed by soldering. It is connected to a terminal (not shown) on the slider 6.

Reference numerals 10 and 11 denote 2 which are opposed to each other.
The two side plates are arranged side by side at a predetermined interval in the left-right direction perpendicular to the forward / backward direction of the slider 6.

Since each of the side plates 10 and 11 has substantially the same structure, the one side plate 10, for example, will be described.
A guide groove 12 is formed of a horizontal groove 12a extending in the advancing and retreating direction) and a vertical groove 12b communicating with the horizontal groove 12a and extending in the vertical direction.

Reference numeral 13 denotes a disc insertion / removal opening 13 which is open to the front.
a disk loader having a.
It is provided between the two and is configured to hold the magneto-optical disk D so that it can be inserted / removed and move between the disk mounting position and the disk anti-mounting position.

A notch 13b facing the slider 6 is formed at the rear edge of the loader ceiling of the disk loader 13, and rollers 14 fitted in the respective guide grooves 12 are attached to both sides of the loader. ing.

Reference numeral 15 is a fan mounting plate having a substantially U-shaped cross section,
Two side pieces 15a and 15b, which face each other via a fan (described later), and both side pieces 15a and 15b.
A base portion 15c connected to the both side plates 10, 11 provided above the disk loader 13.
It is fixed by a mounting screw 16.

The base piece 15c of the fan mounting plate 15 is provided with an air circulation hole 17 which is a round hole opened in the axial direction parallel to the axial direction of the magneto-optical disc D at the disc mounting position.

On the other hand, both side pieces 1 of the fan mounting plate 15
5a and 15b are provided with screw insertion holes (not shown) through which the mounting screws 16 are inserted.

Reference numeral 18 denotes a head air-cooling fan, which is an axial fan that includes the magnetic head 8 and blows air to a part of the recording surface of the magneto-optical disk D at the disk mounting position. The fan mounting plate 15 covers the entire fan. Both side pieces 15a,
It is interposed between 15b and is fixed by a mounting screw 19.

The fan 18 is provided with a holding frame 20 having a fan blower port 20a having an axis matching the axis of the air circulation hole 17, and a drive motor (not shown) rotatably held by the holding frame 20. It is composed of a rotating blade 21.

The arrow A in the figure indicates the direction of the air flow generated by driving the fan 18.

In the magnetic head device thus constructed, the magnetic head 8 is cooled by the air blown by the fan 18 when the current is supplied to the magnetic coil (not shown) of the magnetic head 8.

At this time, when the blades 21 of the fan 18 rotate, the air above the fan passes through the air circulation hole 17 of the fan mounting plate 15 and is sucked into the fan blow port 20a of the holding frame 20, and the arrow in FIG. As shown by A, it is ejected onto the recording surface d of the magneto-optical disc D at the disc mounting position.

That is, the rotation of the blades 21 of the fan 18 causes an air flow downward along the fan axis.

Thereafter, the air flow generated by driving the fan 18 is directed to the slider 7 and the magnetic head 8 along the recording surface of the magneto-optical disk D.

The slider 7 and the magnetic head 8 also receive the air flow generated by the rotation of the magneto-optical disk D.

Therefore, in this embodiment, since the head core 9 does not reach a high temperature as in the conventional case, the magnetic characteristics of the head core 9 can be maintained and the recording efficiency can be prevented from lowering.

In this embodiment, the fact that the magnetic head 8 is a flying type magnetic head means that the current supplied to the magnetic coil (not shown) is set to a small current in order to obtain a magnetic flux sufficient for recording. be able to.

In this embodiment, an example is shown in which the air flow generated by driving the fan 18 is discharged to the recording surface of the magneto-optical disk D and guided to the magnetic head 8, but the present invention is not limited to this. Alternatively, the air flow generated by the driving of the fan 31 may be directly guided to the magnetic head 8 as shown by an arrow B in FIG.

In this case, the fan air flow received by the magnetic head 8 becomes uniform at the inner and outer peripheral portions of the recording surface d of the magneto-optical disk D, that is, at arbitrary disk radial positions.

In the figure, the fan 31 is constituted by a sirocco fan having a duct 32.

The blower port 33 of the fan 31 is formed by a blower port directed toward the magnetic head 8 and extending in the radial direction of the disk at the disk mounting position.

Needless to say, the type and shape of the fan in the present invention are not limited to those in the above-mentioned embodiment.

Besides, in the present embodiment, an example in which the present invention is applied to a magneto-optical disk device has been shown, but the present invention is not limited to this, and can be applied to a magnetic disk device as in the embodiment.

[0059]

As described above, according to the present invention, there is provided a slider corresponding to the recording surface of the disk at the disk mounting position and moving forward and backward in the disk radial direction, and a magnetic head having a head core and a magnetic coil attached to the slider. Since the magnetic head is provided with a fan for blowing air, the magnetic head is cooled by blowing air by driving the fan when current is supplied to the magnetic coil.

Therefore, since the head core does not reach a high temperature as in the conventional case, the magnetic characteristics of the head core can be maintained, a decrease in recording efficiency can be prevented from occurring, and a high transfer rate signal can be recorded by the magnetic field modulation recording method. .

In the second aspect of the invention, since the air blowing port of the fan is directed toward the magnetic head and extends in the radial direction of the disk at the disk mounting position, the fan blowing amount received by the magnetic head is at an arbitrary disk radial position. Thus, a magnetic head having a uniform cooling effect can be obtained at any slider movement position.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head device according to the present invention.

FIG. 2 is a perspective view showing another embodiment.

FIG. 3 is a perspective view showing a conventional magnetic head device.

[Explanation of Codes] 6 ... Slider 8 ... Magnetic Head 9 ... Head Core 18 ... Fan 20 ... Holding Frame 20a ... Blowing Port 21 ... Blade D ... Photomagnetic Disk

Claims (2)

[Claims] 1. A slider equipped with a slider that moves forward and backward in the disk radial direction corresponding to the recording surface of the disk at a disk mounting position, and a magnetic head having a head core and a magnetic coil attached to the slider, and a fan for blowing air to the magnetic head. A magnetic head device characterized by being attached. 2. The blower port of the fan is directed toward the magnetic head and is extended in the radial direction of the disk at the disk mounting position.
The magnetic head device described.