JPH05135421A - Magnetic field modulation type magneto-optical recorder - Google Patents

Abstract

PURPOSE:To realize non-contact running of a magnetic head to a magneto- optical disk by floating the magnetic head regardless of the circumferential speed of the magneto-optical disk. CONSTITUTION:In a magnetic field modulation type magneto-optical recorder A1 where a magnetic head 5 and an optical head 4 are arranged with a magneto-optical disk 3 in between, the magnetic head 5 and the optical head 4 are mutually interlocked through an interlocking mechanism 13 and the magnetic head 5 approaches to the magneto-optical disk 3 to perform magneto- optical recording, a slider 16 is stuck to the circumference of the magnetic head 5 by e.g. an adhesive and plural through holes 17 are formed so as to have their opening face the magneto-optical disk 3 side. Then, a guide pipe 19 is arranged and constituted from an air compressor 18 attached to a second motor shaft 2b of a spindle motor 1 to through holes 17 of the slider 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system head and a magnetic head which are interlocked with each other so as to face each other with a magneto-optical recording medium interposed therebetween, and magneto-optical recording is performed on the magneto-optical recording medium by a magnetic field modulation method. The present invention relates to a magnetic field modulation type magneto-optical recording device.

[0002]

2. Description of the Related Art One of so-called writable optical disks capable of writing, erasing and reading information by using a light beam is called a magneto-optical disk.

In this magneto-optical disk, a perpendicular magnetic film forming a recording layer is provided on a transparent substrate, a reflective film made of a metal thin film is laminated on the perpendicular magnetic film, and the reflective film is formed by UV coating or the like. It has a structure covered with a protective layer made of a resin material.

When information is written to this magneto-optical disk, the magneto-optical disk is rotated at a predetermined rotation speed with its central portion as the center of rotation, and the perpendicular magnetization of the recording tracks formed on the magneto-optical disk. By applying a laser beam to the film with an external magnetic field applied,
A portion of the perpendicularly magnetized film in the recording track, which receives the laser beam, performs a magnetization direction according to the direction of the external magnetic field as the temperature of the laser beam rises.

Then, when the laser beam has a substantially constant light intensity, a so-called magnetic field modulation method in which the external magnetic field changes according to a recording signal, or when the external magnetic field becomes substantially constant, the laser beam By the so-called optical modulation method in which the light intensity changes according to the recording signal, the magnetization direction reversal region is formed with a predetermined pattern in the perpendicular magnetization film of the recording track to write information.

As described above, when the information is written on the magneto-optical disk by, for example, the magnetic field modulation method, the recording signal magnetic field generator for generating the external magnetic field according to the recording signal on the perpendicular magnetization film of the magneto-optical disk is used. Used.

As this recording signal magnetic field generator, a magnetic head for magneto-optical recording is used, which is formed by winding a coil to which a current according to a recording signal is supplied, around a magnetic core.

When magnetic recording is performed on the perpendicular magnetic film of the magneto-optical disk by such a magnetic head, it is desired that the perpendicular magnetic film of the magneto-optical disk can be magnetized with sufficient strength. It is necessary to place it as close as possible to the surface of the magnetic disk.

[0009]

However, the above magneto-optical disk may cause surface wobbling during its rotation due to its inclination, non-uniformity of thickness, etc., and therefore the magnetic head is subjected to another position control. It is very difficult to hold the surface of the magneto-optical disk without coming into contact with the surface of the magneto-optical disk and keeping it sufficiently close.

From the above, the magnetic head is
Like a magnetic head for a hard disk, it is desirable to use a so-called flying head that floats above the surface of the magneto-optical disk. However, in the case of a magneto-optical disk, unlike a hard disk, it has a low peripheral speed, so it is difficult to rotate the magneto-optical disk. Due to the accompanying wind force, the magnetic head cannot be levitated.

Therefore, conventionally, an example has been proposed in which a servo control mechanism for controlling the position of the magnetic head is provided. This is because the magnetic head is attached to a predetermined actuator, the displacement between the magnetic head and the surface of the magneto-optical disk is detected, and the actuator is driven based on the detected output, so that the magneto-optical disk causes surface wobbling during its rotation. Even if it occurs, the gap between the magnetic head and the magneto-optical disk surface can be maintained at a predetermined value.

The displacement between the magnetic head and the surface of the magneto-optical disk when servo control is performed for such a magnetic head is detected by, for example, electrostatic between the reflective layer provided on the magneto-optical disk and the magnetic head. This is done by detecting a capacitance change.

In this case, it is necessary to provide a capacitance detection electrode facing the magneto-optical disk and move the capacitance detection electrode integrally with the magnetic head. Therefore, the capacitance detection electrode is attached to a magnetic head or an actuator that drives the magnetic head, and the actuator can be driven together with the magnetic head. However, the configuration including the magnetic head and the capacitance detection electrode is complicated and large. In addition, there is a problem that an excessive driving load is applied to the actuator.

Further, eddy current may be generated in the capacitance detection electrode due to the magnetic field from the magnetic head, and the capacitance detection electrode may generate heat due to eddy current loss.

Therefore, recently, a sliding type magnetic head for magneto-optical recording has been proposed which can keep a minute gap between the magnetic head and the surface of the magneto-optical disk constant. As shown in FIG. 3, this magnetic head includes a central magnetic pole core 31 and side magnetic pole cores 3 provided so as to surround the central magnetic pole core 31.
2 is integrally formed of ferrite.
In the figure, 33 is a magneto-optical disk, 34 is a protective layer, 35 is a perpendicular magnetization film, and 36 is a base material. Also,
Reference numeral 37 represents an exciting coil.

However, the sliding surface 32a of the side magnetic pole core 32 with respect to the disk surface has a rectangular shape.
Since the main processing is mainly linear groove processing and surface grinding / polishing, it is difficult to obtain a good suitable sliding condition for the magneto-optical disk 33 having low hardness.

That is, it has been difficult to examine the appropriateness of the frictional resistance sliding life due to the contact surface area and the prevention of damage to the magneto-optical disk 33 due to the sharp end of the ferrite core. In addition, since the sliding surface of the magnetic head is mirror-finished, so-called "sticking" occurs between the contact surfaces of the magnetic head and the magneto-optical disk 33, which impedes the constant-speed rotation of the magneto-optical disk 33. there were. In addition, there is a problem that abrasion powder from the magneto-optical disk generated by the sliding contact of the magnetic head causes a failure of the drive system and the circuit system.

In order to solve the above problem, as shown in FIG. 4, a sliding contact ring 43 having a low frictional resistance is separately provided so as to surround the central magnetic pole core 42 provided in the central portion of the base core 41. There has been proposed an example in which magneto-optical recording is performed while the end surface of the sliding contact ring 43 is brought into contact with and slid on the magneto-optical disk 33. In the figure, reference numeral 44 indicates an exciting coil.

However, in this case, since it is necessary to newly provide the sliding contact ring 43, there is a new problem that the number of parts of the magnetic head itself is increased, the man-hour is increased, and the cost is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to levitate a magnetic head irrespective of the peripheral speed of the magneto-optical disk and to provide a magnetic force to the magneto-optical disk. To provide a magnetic field modulation type magneto-optical recording device capable of realizing non-contact traveling of a head, eliminating the need for a servo mechanism such as a distance sensor and an actuator, and discharging dust flying around the magnetic head. is there.

Further, when the present invention is applied to a sliding type magneto-optical recording device which performs magneto-optical recording while sliding contact with a magneto-optical disk, the number of parts can be reduced, and as a result, the material can be reduced. Cost reduction, assembly man-hour reduction, management cost reduction can be realized, manufacturing cost can be reduced, contact friction of the magnetic head with respect to the magneto-optical disk surface can be reduced, and abrasion of the magneto-optical disk can be suppressed. (EN) Provided is a magnetic field modulation type magneto-optical recording device.

[0022]

According to the present invention, a magnetic head 5 and an optical head 4 are arranged with a magneto-optical recording medium 3 interposed therebetween, and the magnetic head 5 and the optical head 4 are interlocking means 13
In the magnetic field modulation type magneto-optical recording apparatus A ₁ which performs the magneto-optical recording with the magnetic head 5 approaching to the magneto-optical recording medium 3 by the air compression means 18, the magnetic head 5 is provided with the magneto-optical recording medium 3. It has an ejection hole 17 for ejecting air toward the surface, and is provided with a pipe 19 for guiding the compressed air from the air compression means 18 to the ejection hole 17.

Further, in the present invention, the magnetic head 5 and the optical head 4 are arranged with the magneto-optical recording medium 3 interposed therebetween, and the magnetic head 5 and the optical head 4 are interlocked with each other by the interlocking means 13 so that the magnetic head 5 In the magnetic field modulation type magneto-optical recording apparatus A ₂ which performs sliding contact with the magneto-optical recording medium 3 to perform magneto-optical recording, an air squeezing means 18 is provided, and air is directed to the magnetic head 5 toward the magneto-optical recording medium 3 surface. Jet hole 1 for jetting
7, the compressed air from the air compression means 18 is blown out 1
The piping 19 leading to the magnetic head 7 is provided, and the levitation force of the magnetic head 5 by compressed air is made equal to or less than the pressure contact force of the magnetic head 5 to the magneto-optical recording medium 3.

[0024]

According to the first configuration of the present invention described above, the magnetic field modulation type magneto-optical recording apparatus A ₁ is provided with the air squeezing means 18, and air is ejected toward the magnetic head 5 toward the surface of the magneto-optical recording medium 3. Since the jetting holes 17 are provided and the piping 19 for guiding the compressed air from the air compressing means 18 to the jetting holes 17 is provided, the magnetic head is generated by the compressed air from the air compressing means 18 jetting from the jetting holes 17. 5 will float above the magneto-optical recording medium 3. Therefore, the magnetic head 5 can be levitated regardless of the peripheral speed of the magneto-optical recording medium 3, and the non-contact traveling of the magnetic head 5 with respect to the magneto-optical recording medium 3 can be realized.

Further, the magnetic head 5 can be brought sufficiently close to the magneto-optical recording medium 3 by appropriately adjusting the jetting force of the compressed air from the jetting hole 17, and the distance sensor which has been used conventionally is used. A servo mechanism such as an actuator or an actuator can be eliminated.

Further, the dust flying around the magnetic head 5 can be discharged by the compressed air ejected from the ejection holes 17, so that the drive system and the circuit system in the magneto-optical recording apparatus A ₁ can be prevented in advance. can do.

According to the second structure of the present invention, the magnetic field modulation type magneto-optical recording device A ₂ is provided with the air squeezing means 18.
The magnetic head 5 is provided with an ejection hole 17 for ejecting air toward the surface of the magneto-optical recording medium 3, and a pipe 19 for guiding the compressed air from the air compression means 18 to the ejection hole 17 is provided.
The levitation force of the magnetic head 5 by compressed air is
Since the pressure contact force to the magneto-optical recording medium 3 is equal to or less than the pressure contact force to the magneto-optical recording medium 3, the magnetic head 5 contacts the magneto-optical recording medium 3 with a slight pressing force, or the pressing force to the magnetic head 5 and the floating to the magnetic head 5. The forces come into contact with each other in a balanced state (strictly speaking, the state of contact and non-contact),
The contact friction of the magnetic head 5 with respect to the magneto-optical recording medium 3 can be effectively reduced.

Therefore, the sliding contact ring which has been conventionally required can be omitted, and the number of parts of the magnetic head itself can be reduced, thereby reducing the material cost, the assembly man-hour, and the management cost. Therefore, the manufacturing cost can be reduced. Further, since the contact friction of the magnetic head 5 with respect to the magneto-optical recording medium 3 can be reduced, the abrasion of the magneto-optical recording medium by the magnetic head 5 can be significantly suppressed.

Further, dust flying around the magnetic head 5 and abrasion powder from the magneto-optical recording medium 3 generated by contact sliding of the magnetic head 5 can be discharged by compressed air ejected from the ejection holes 17. Therefore, the magneto-optical recording device A
It is possible to prevent the failure of the drive system and circuit system in ₂ in advance.

[0030]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram showing a magnetic field modulation type magneto-optical recording device A _{1 according} to the first embodiment.

In this magneto-optical recording apparatus A ₁ , a magneto-optical recording medium (hereinafter referred to as a magneto-optical disk) 3 attached to a first motor shaft 2a of a spindle motor 1 is sandwiched between the optical system heads 4 respectively. And the magnetic head 5 are arranged so as to face each other.

The optical system head 4 deflects the laser light L emitted in the horizontal direction from a laser light source (not shown) in the vertical direction (to the side of the magneto-optical disk 3) by the prism 6, and the deflected laser light L is used as a lens. At 7, the light is focused on the recording layer (perpendicular magnetization film) 8 of the magneto-optical disk 3.

On the other hand, in the magnetic head 5, a central magnetic pole core 9 and a side magnetic pole core 10 provided so as to surround the central magnetic pole core 9 are integrally formed of ferrite, and further, between the central magnetic pole core 9 and the lateral magnetic pole core 10. The coil 11 is inserted in the space formed in the above.

The optical system head 4 is slidable in the track direction of the magneto-optical disk 3 by a slide mechanism 12. An interlocking mechanism 13 is connected to the slide mechanism 12 of the optical system head 4.

In principle, the interlocking mechanism 13 is composed of a U-shaped interlocking arm 14 extending upward so as to avoid the space for accommodating the magneto-optical disk 3, and particularly the upper arm 26a.
Is formed like a leaf spring.

The magnetic head 5 is attached to the lower end of the tip of the upper arm 14a via a gimbal spring 15. Therefore, the movement of the optical system head 4 is transmitted to the magnetic head 5 via the interlocking mechanism 13, whereby the optical system head 4 and the magnetic head 5 face each other and interlock with each other.

In this example, however, the magnetic head 5
The slider 16 is fixed to the periphery of the substrate with an adhesive, for example.
A plurality of through holes 17 are formed in the slider 16 with their openings facing the magneto-optical disk 3 side. Then, from the air compressor 18 attached to the second motor shaft 2b of the spindle motor 1 to the slider 16
The conduit 19 is piped through the through hole 17 of FIG. Since the slider 16 may collide with the surface of the magneto-optical disk 3 due to an accident, the slider 16 has relatively low hardness and high wear resistance,
It is desirable to use a self-lubricating resin material.

The rotation speed of the second motor shaft 2b is set lower than that of the first motor shaft 2a to which the magneto-optical disk 3 is attached by the acceleration / deceleration mechanism 20 provided in the spindle motor 1. Configured to increase.

The air compressor 18 has at least two openings 2 in addition to the openings to which the conduits are connected.
1 and 22 are provided, one of which is an air inlet 21,
The other one is the pressure adjusting port 22. This pressure adjustment port 22
A pressure adjusting device 23 such as a pressure adjusting valve is attached in the subsequent stage. A dust removing filter 24 is provided near the inlet of the air compressor 18 of the air inlet 21. Therefore,
Compressed air purified by the filter 24 is ejected from the air compressor 18.

With this structure, compressed air from the air compressor 18 is sent to the through hole 17 of the slider 16 through the conduit, and the compressed air is ejected from the through hole 17 to the magneto-optical disk 3 side. Become. From this, the through hole 17 provided in the slider 16 constitutes an air ejection hole.

Then, by adjusting the pressure of the air compressor 18 by the pressure adjusting device 23, the jetting force of the compressed air from the air jetting holes 17 is adjusted so that the magnetic head 5 is sufficiently moved with respect to the surface of the magneto-optical disk 3. Can be levitated in close proximity. In this case, since the pressure contact force of the magnetic head 5 by the gimbal spring 15 is about 3 g, the pressure of compressed air may be adjusted so that the floating force is slightly larger than this pressure contact force.

When writing information to the magneto-optical disk 3, the magneto-optical disk 3 is used as the first motor shaft 2.
The laser beam L is made incident from the optical system head 4 while being rotated at a predetermined rotation speed via a, and further being applied with an external magnetic field by the magnetic head 5 on the recording layer 8 formed on the magneto-optical disk 3. Then, the portion of the recording layer 8 which receives the laser light L is increased in temperature by the laser light L,
The magnetization direction is set according to the direction of the external magnetic field.

Then, when the laser light L has a substantially constant light intensity, the so-called magnetic field modulation method in which the external magnetic field changes in accordance with the recording signal causes a magnetization direction reversal region to be formed in the recording layer 8 with a predetermined pattern. Once formed, information is written.

The relationship between the rotation of the magneto-optical disk 3 and the levitating operation of the magnetic head 5 may be such that the magnetic head 5 is levitated from the stopped state of the magneto-optical disk 3 or is employed in a magnetic head of a hard disk. It may be operated by a so-called contact start / stop system.

According to the first embodiment, the magnetic field modulation type magneto-optical recording apparatus A ₁ is provided with the air compressor 18 which is an air squeezing means, and the magnetic head 5 ejects air toward the surface of the magneto-optical disk 3. Since the slider 16 having the ejection holes 17 is attached and the conduit 19 for guiding the compressed air from the air compressor 18 to the ejection holes 17 is connected, the compression from the air compressor 18 ejected from the ejection holes 17 is performed. The air causes the magnetic head 5 to fly above the magneto-optical disk 3. Therefore, regardless of the peripheral speed of the magneto-optical disk 3, the magnetic head 5
Can be levitated, and non-contact traveling of the magnetic head 5 with respect to the magneto-optical disk 3 can be realized.

Further, by appropriately adjusting the ejection force of the compressed air from the ejection holes 17 by the pressure adjusting device 23,
The magnetic head 5 can be brought sufficiently close to the magneto-optical disk 3, and the conventionally used servo mechanism such as a distance sensor and an actuator can be eliminated.

Further, the dust flying around the magnetic head 5 can be discharged by the compressed air jetted from the jet holes, and the failure of the drive system and the circuit system in the magneto-optical recording apparatus A ₁ can be prevented in advance. be able to.

Next, a magnetic field modulation type magneto-optical recording device A _{2 according} to the second embodiment will be described with reference to FIG.
The same reference numerals are given to those corresponding to FIG.

The magneto-optical recording apparatus A _{2 according} to the second embodiment.
Has substantially the same configuration as that of the first embodiment, but the pressure (jetting force) of the compressed air from the air compressor 18 is pressed against the magnetic head 5 by the gimbal spring 15 (about 3 g).
It is different in that it is set equal to or less than. The pressure adjustment device 23 adjusts the pressure of the compressed air.

As a result, the magnetic head 5 comes into contact with and slides on the surface of the magneto-optical disk 3. At this time,
The magnetic head 5 comes into contact with the magneto-optical disk 3 with a slight pressing force smaller than the pressure contact force of the gimbal spring 15. In particular, when the jetting force of the compressed air is set to be equal to the pressure contact force of the gimbal spring 15, the magnetic head 5 contacts the magneto-optical disk 3 in a state where the pressing force against the magneto-optical disk 3 and the levitation force of the compressed air are in balance. Become. Strictly speaking,
It becomes a non-contact boundary.

Therefore, according to the second embodiment, the contact friction of the magnetic head 5 with respect to the magneto-optical disk 3 can be effectively reduced, and the sliding contact ring conventionally required (see FIG. 4) can be provided. It can be omitted. As a result, the number of parts of the magnetic head 5 itself can be reduced, which can reduce the material cost, the assembly man-hour, the management cost, and the manufacturing cost. Further, since the contact friction of the magnetic head 5 with respect to the magneto-optical disk 3 can be reduced, the wear of the magneto-optical disk 3 by the magnetic head 5 can be significantly suppressed.

Further, dust flying around the magnetic head 5 and abrasion powder from the magneto-optical disc 3 generated by the contact sliding of the magnetic head 5 can be discharged by the compressed air ejected from the ejection holes 17. , Magneto-optical recording device A
It is possible to prevent the failure of the drive system and circuit system in ₂ in advance.

In the first and second embodiments, the air compressor 18 is also driven by the spindle motor 1 which is the rotary drive system for the magneto-optical disk 3.
Of course, a dedicated small motor may be used.
However, in order to miniaturize the magneto-optical recording devices A ₁ and A ₂ , it is desirable that the spindle motor 1 also drives the air compressor 18 as in the first and second embodiments.

[0054]

According to the magnetic field modulation type magneto-optical recording apparatus of the present invention, the magnetic head can be levitated regardless of the peripheral speed of the magneto-optical disk, and the magnetic head can run in a non-contact manner with respect to the magneto-optical disk. In addition to being realized, a servo mechanism such as a distance sensor and an actuator is unnecessary, and dust that has fly around the magnetic head can be discharged.

Further, according to the magnetic field modulation type magneto-optical recording apparatus of the present invention, when it is applied to a sliding type magneto-optical recording apparatus for performing magneto-optical recording while sliding in contact with a magneto-optical disk, The number of parts can be reduced, which can reduce the material cost, the assembly man-hour, the management cost, and the manufacturing cost.
It is possible to reduce contact friction of the magnetic head with respect to the surface of the magneto-optical disk and suppress wear of the magneto-optical disk.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a magnetic field modulation type magneto-optical recording device according to a first embodiment.

FIG. 2 is a schematic configuration diagram showing a magnetic field modulation type magneto-optical recording device according to a second embodiment.

FIG. 3 is a configuration diagram showing a sliding type magneto-optical recording magnetic head according to a conventional example.

FIG. 4 is a configuration diagram showing a sliding type magneto-optical recording magnetic head using a sliding contact ring.

[Explanation of symbols]

A ₁ , A ₂ magnetic field modulation type magneto-optical recording device 1 spindle motor 2a first motor shaft 2b second motor shaft 3 magneto-optical disk 4 optical system head 5 magnetic head 8 recording layer (perpendicular magnetization film) 9 central magnetic pole core 10 Side Magnetic Pole Core 11 Excitation Coil 12 Slide Mechanism 13 Interlocking Mechanism 15 Gimbal Spring 16 Slider 17 Through Hole (Air Jet Hole) 18 Air Compressor 19 Conduit 21 Air Inlet 23 Pressure Adjuster

Claims (3)

[Claims] 1. A magnetic head and an optical head are arranged with a magneto-optical recording medium sandwiched therebetween, the magnetic head and the optical head are interlocked with each other by interlocking means, and the magnetic head approaches the magneto-optical recording medium. In a magnetic field modulation type magneto-optical recording device for performing magneto-optical recording, an air squeezing means is provided, and an ejecting hole for ejecting air toward the magneto-optical recording medium surface is provided in the magnetic head. 2. A magnetic field modulation type magneto-optical recording device comprising: a pipe for guiding compressed air of 1. to the ejection hole. 2. A magnetic head and an optical head are arranged with a magneto-optical recording medium sandwiched therebetween, and the magnetic head and the optical head are interlocked with each other by interlocking means, and the magnetic head is brought into contact sliding contact with the magneto-optical recording medium. In the magnetic field modulation type magneto-optical recording device for performing magneto-optical recording, an air squeezing means is provided, and the magnetic head has an ejection hole for ejecting air toward the surface of the magneto-optical recording medium. The compressed air from the means is provided to the ejection hole, and the levitation force of the magnetic head by the compressed air is equal to or less than the pressure contact force of the magnetic head with respect to the magneto-optical recording medium. A magnetic field modulation type magneto-optical recording device characterized by the above. 3. The drive source of the magneto-optical recording medium also serves as the drive source of the air compression device.
Alternatively, the magnetic field modulation type magneto-optical recording device according to item 2.