JPH0644501A - Magnetic head of magneto-optical recording device - Google Patents

Abstract

PURPOSE:To improve a contact characteristic by forming the recording medium- contact part of the magnetic head as a curved surface, providing this contact part with a synthetic resin and subjecting the core of magnetic head to impregnation with fluorine. CONSTITUTION:This magnetic head 101 is brought into contact with a magneto- optical recording medium 105 to strengthen the magnetic fields in a recording layer. The contact part 107 is worked into a spherical surface whose peak point coincides with the central point of the front end of a main magnetic pole 109 so that the contact part comes into contact only at a microarea with the recording medium 105. Further, this part is energized to the medium 105 by the elastic force of a suspension 102 and, therefore, the stationary contact with the medium 105 is possible at all times. The magnetic head core 108 is impregnated with the fluorine and has a synthetic resin in the part where the magnetic head core and the recording medium face each other. The friction force is reduced and a stick-slip or sticking are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head of a magneto-optical recording device used for recording or erasing an information signal by contacting the magneto-optical recording medium, and more particularly, contact characteristics with the magneto-optical recording medium. The present invention relates to a magnetic head of a magneto-optical recording device with improved characteristics.

[0002]

2. Description of the Related Art A magnetic head of a conventional magneto-optical recording device is
This will be described with reference to FIGS. 17 and 18. FIG. 17 is a sectional view of a main part of a conventional magnetic head, and FIG. 18 is a schematic view of a magneto-optical recording device to which the magnetic head of FIG. 17 is applied.

The magnetic head 1 is arranged in contact with the magneto-optical recording medium 8 so as to face it. The magneto-optical recording medium 8 is rotatably fixed to the spindle motor 7. Magnetic head 1
Is the magnetic head 1 against the undulations of the magneto-optical recording medium 8.
Is fixed to a gimbal 2 for constantly contacting with the magneto-optical recording medium 8, and the gimbal 2 is fixed to a suspension 4 via an arm 3. A part of the suspension 4 is fixed to the carriage 5 which is movable in the radial direction of the magneto-optical recording medium 8, and the magneto-optical recording medium 8 is provided on the opposite side of the magnetic head 1 in the axial direction of the magneto-optical recording medium 8. An optical system 6 capable of emitting laser light is mounted. A core 9, a main magnetic pole 10 formed integrally with the core 9, and a coil 11 wound around the main magnetic pole 10 are fixed to a head holder 12 of the magnetic head 1. By energizing the coil 11, A magnetic field is generated from the tip 10a of the main pole 10.
In the magneto-optical recording device configured as described above, the optical system 6 irradiates the recording layer of the magneto-optical recording medium 8 with laser light, and the magnetic field generated from the tip 10a of the main magnetic pole 10 of the magnetic head 1 is recorded. By applying to the layer, the recording layer is magnetized in a predetermined direction, and the information signal is recorded / erased.

[0004]

However, in the conventional magnetic head, the edge portion of the magnetic head or dust in the atmosphere scratches the protective layer or the recording layer of the magneto-optical recording medium to record an information signal. It has been impossible to make stable contact with the magneto-optical recording medium by making erasing impossible or causing stick-slip or stiction depending on the state of the surface of the magneto-optical recording medium. Further, since the friction coefficient between the conventional magnetic head and the magneto-optical recording medium is extremely large, the load torque on the spindle motor due to the frictional force increases, the rotation unevenness increases, and the servo performance deteriorates.

In view of the above problems, the present invention makes stable contact between the magnetic head and the magneto-optical recording medium, improves the servo performance when controlling the speed of the spindle motor, and improves the information to the magneto-optical recording medium. The purpose is to securely erase the recorded data.

[0006]

When used with an optical system which is arranged in contact with a magneto-optical recording medium so as to face each other and irradiates light,
In a magnetic head of a magneto-optical recording device for recording or erasing an information signal by generating a magnetic field, the magneto-optical recording medium facing contact portion of the magnetic head is a curved surface.

Further, a center pin provided with a coil,
A magnetic head comprising a cylindrical core integrally formed with the center pin and arranged to enclose the center pin, wherein a magnetic field can be generated from an end of the center pin by energizing the coil. The above-mentioned magneto-optical recording medium facing contact portion is provided with a synthetic resin. Particularly, the synthetic resin is provided in the magneto-optical recording medium facing portion of the center pin or the magneto-optical recording medium facing portion of the cylindrical core.

Further, the synthetic resin is characterized by being formed by coating with a fluorine resin or the like.

Further, in an E-shaped core, a coil provided in the center core of the core, and a magnetic head in which a magnetic field is generated from an end of the center core by energizing the coil and a magnetic flux returns to the side core. The magnetic field generating portion of the center core, the end portions of the side cores, or both of them are provided with synthetic resin. A magnetic head of a magneto-optical recording device for recording or erasing an information signal by generating a magnetic field when used with an optical system for irradiating light, which is arranged so as to face the magneto-optical recording medium. In a magnetic head capable of generating a magnetic field from a part of the core by energizing a core forming a magnetic path and a coil provided in the core, a fluorine is provided in at least a magneto-optical recording medium facing contact portion of the core. Is characterized by being impregnated with.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) A magnetic head according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a sectional view of a magnetic head according to a first embodiment of the present invention, and FIG. 2 is a schematic view of a magneto-optical recording device to which the magnetic head according to the first embodiment of the present invention is applied.

The magnetic head 101 is arranged with the contact portion 107 in contact with the magneto-optical recording medium 105 so as to face it. The magnetic head 101 is fixed to the suspension 102 by, for example, bonding, and the suspension 10
The elastic force of 2 urges the magneto-optical recording medium 105 with a load of about 0.1 to 1 gram. Therefore, the magnetic head 101 constantly contacts the magneto-optical recording medium 105.

Magneto-optical recording medium 105 of magnetic head 101
An optical system 104 for irradiating the recording layer of the magneto-optical recording medium 105 with laser light is arranged on the axially opposite side. An optical system 104 is mounted on a carriage 103 that is movable in the radial direction of the magneto-optical recording medium 105, and
A part of the suspension 102 is fixed. At this time, since the optical axis of the optical system 104 and the central axis of the magnetic field generating portion of the magnetic head 101 are arranged coaxially, the carriage 10 is driven by actuator means such as a motor.
By moving 3, the optical system 104 and the magnetic head 101 can be coaxially moved and positioned at a desired position on the magneto-optical recording medium 105.

The magnetic head 101 includes a cylindrical core 108 for forming a magnetic path, a main magnetic pole 109 formed integrally with the cylindrical core 108, and a coil 1 provided on the main magnetic pole 109.
11, a head portion holder 11 for holding the cylindrical core 108
The magnetic field is generated from the tip 109a of the main magnetic pole 109 by energizing the coil 111.

In the magneto-optical recording apparatus having the above-described structure, the optical system 104 irradiates the recording layer of the magneto-optical recording medium 105 with laser light while the spindle motor 106 is rotated at a predetermined rotational speed. The recording layer of the magneto-optical recording medium 105 is heated to a temperature above the Curie point.
The main pole 10 of the magnetic head 101 is attached to the heated portion.
The recording layer is magnetized by applying a magnetic field generated from the tip 109 a of the magnetic recording layer 9. Since the magnetization direction of the recording layer is switched by switching the direction of the magnetic field, it is possible to record and erase the information signal.

Since the magnetic head 101 is brought into contact with the magneto-optical recording medium 105 so that a large magnetic field can be taken in the recording layer, the contact portion 107 is formed into a spherical surface so that the center point of the tip of the main magnetic pole 109 becomes the apex. Processed, magneto-optical recording medium 1
05 is in contact with only a small area. Furthermore, since the magneto-optical recording medium 105 is biased by the elastic force of the suspension 102, steady and stable contact with the magneto-optical recording medium 105 is possible. Here, the entire surface of the magnetic head 101 facing the magneto-optical recording medium 105 does not necessarily have to be a spherical surface, and even if only the portion in contact with the magneto-optical recording medium 105 is a spherical surface, the magneto-optical recording medium 105 is also possible. It may be a curved surface that makes point contact with.

The suspension 102 for urging the magnetic head 101 is, for example, stainless steel for spring,
Alternatively, it may be made of beryllium copper, but instead of the suspension 102, a coil spring or other elastic member made of synthetic resin may be used.

As described above, the magnetic head 10 of this embodiment
Reference numeral 1 indicates the contact portion 107 of the magnetic head 101 as the main magnetic pole 109.
Since the spherical surface is such that the center point of the tip of
It is in direct and stable contact with the magneto-optical recording medium 105. Therefore, the strength of the magnetic field applied to the magneto-optical recording medium 105 becomes stable because the distance is constant, and reliable magneto-optical recording / erasing is realized.

Further, even with respect to the waviness of the magneto-optical recording medium 105, the contact portion 107 of the magnetic head 101 is connected to the main magnetic pole 10.
9 is a spherical surface with the center point at the tip as the apex, so it can be sufficiently tracked, the conventional gimbal is not required, and the assembly process can be simplified and the assembly accuracy can be improved. Second Embodiment A magnetic head according to a second embodiment of the present invention will be described with reference to FIGS. 3, 4, 5, and 6. 3 is a perspective view of a magnetic head according to a second embodiment of the present invention, FIG. 4 is a sectional view taken along plane A of FIG. 3, FIG. 5 is a sectional view taken along plane B of FIG. 3, and FIG. 3 is a schematic view of a magneto-optical recording device to which the magnetic head of FIG.

The magnetic head 201 is arranged with the contact portion 207 in contact with the magneto-optical recording medium 205 so as to face it. The magnetic head 201 is fixed to the suspension 202 by, for example, adhesion, and also the suspension 20.
The elastic force of 2 urges the magneto-optical recording medium 205 with a load of about 0.1 to 1 gram. Therefore, the magnetic head 201 constantly contacts the magneto-optical recording medium 205.

Magneto-optical recording medium 205 of magnetic head 201
An optical system 204 for irradiating the recording layer of the magneto-optical recording medium 205 with laser light is arranged on the opposite side in the axial direction of. An optical system 204 is mounted on a carriage 203 that is movable in the radial direction of the magneto-optical recording medium 205, and
The suspension 202 is fixed. At this time, since the optical axis of the optical system 204 and the central axis of the magnetic field generating portion of the magnetic head 201 are arranged coaxially, the optical system 204 is moved by moving the carriage 203 by an actuator means such as a motor. And magnetic head 201
Can be coaxially moved and positioned at a desired position on the magneto-optical recording medium 205.

The magnetic head 201 is composed of a core 208 for generating a magnetic field, a coil 211, and a holder 212 for holding the core 208. By energizing the coil 211, the main magnetic pole is formed integrally with the core 208. A magnetic field is generated from the tip 209a of 209.

In the magneto-optical recording apparatus configured as described above, the optical system 204 irradiates the recording layer of the magneto-optical recording medium 205 with laser light while the spindle motor 206 is rotated at a predetermined number of revolutions. The recording layer of the magneto-optical recording medium 205 is heated to a temperature above the Curie point.
The main pole 20 of the magnetic head 201 is attached to the heated portion.
By applying a magnetic field generated from the tip 209 a of the recording layer 9, the recording layer is magnetized. By switching the direction of the magnetic field, the magnetization direction of the recording layer is switched, and the information signal can be recorded / erased.

In the second embodiment, the core 208 and the main magnetic pole 209 integral with the core 208 are integrally formed by the holder 212 made of synthetic resin or ceramics.
The mechanical strength is high, and the processing for forming the curved surface of the magneto-optical recording medium facing surface may be performed by processing the holder 212 and the main magnet 209 together, and thus is excellent in workability.

Further, the holder 212 is formed by molding a synthetic resin, and the synthetic resin is used for the magneto-optical recording medium 2.
05 may be contacted. In this case, since the tip 209a of the main magnetic pole 209 is not in contact with the magneto-optical recording medium,
If the molded synthetic resin is a resin having good lubricity such as a fluorine-based resin, the friction coefficient between the magnetic head 201 and the magneto-optical recording medium 205 can be reduced.

The magneto-optical recording medium facing surface 207 of the magnetic head 201 is a circular arc having different curvatures Ra and Rb, but it does not necessarily have to be a circular arc having the apex center of the tip of the main magnetic pole 209. Ra and Rb may have the same value.

(Third Embodiment) A magnetic head according to a third embodiment of the present invention will be described with reference to the drawings. 7 is a perspective view of a magnetic head according to a third embodiment of the present invention, and FIG. 8 is a third embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of the magnetic head of FIG.

A center pin 302 integrally formed with the cylindrical core 301 is provided with a coil 303. Magnetic field generator 302a of center pin 302 and cylindrical core 3
The end portion 301a of 01 is on the same plane, and the contactor 304 made of synthetic resin is coated on the plane. Although the contactor 304 uses a fluorine-based resin, a polyimide-based resin or the like may be used as long as the material has excellent wear resistance and slidability. The cylindrical core 301 is formed with a hole 301b for drawing out the lead wire 303a of the coil 303. The hole 301b may have a cutout shape.

FIG. 9 shows a magneto-optical recording apparatus to which the magnetic head 305 having the above structure is applied. FIG. 9 is a schematic diagram of a magneto-optical recording device to which the magnetic head of Example 3 of the invention is applied. A donut-shaped magneto-optical recording medium 307 for recording information is rotatably clamped to the spindle motor 311 via a clamper 312. The magnetic head 305 is fixed to the elastically deformable suspension 306, and is attached to the magneto-optical recording medium 307 in an amount of 0.1 to 0.1.
It is urged with a force of about 1 gram.

On the carriage 310, the suspension 3
A part of 06 is fixed and the magneto-optical recording medium 30
7 is provided with an optical system 308 having a laser oscillator for irradiating a laser beam. The optical system 308 includes an objective lens 309, and is mounted on the carriage 310 in such a state that it can be moved by a small amount in the radial direction and the axial direction of the magneto-optical recording medium 307 by an actuator means (not shown). The carriage 310 is also movable in the radial direction of the magneto-optical recording medium 307. The magnetic head 3
The central axis of the magnetic field generation unit 05 and the central axis of the objective lens 309 are adjusted at the time of assembly so as to be coaxial.

In such a state, the spindle motor 31
1 is rotated at a predetermined rotation speed to move and position the carriage 310 and the optical system 308, and the light spot formed by the laser beam emitted from the optical system 308 is moved and positioned to the target position of the magneto-optical recording medium 307.

Recording and erasing of information on the magneto-optical recording medium 307 in such a magneto-optical recording device will be described with reference to FIG. FIG. 10 is an explanatory diagram for explaining recording and erasing of an information signal on a magneto-optical recording medium.

The laser light condensed by the objective lens is
A light spot 3 is formed on the recording layer 307a of the magneto-optical recording medium 307.
13 is formed. When the light spot 313 hits the recording layer 307a, the temperature of the recording layer 307a rises above the Curie point. However, since the magneto-optical recording medium 307 is rotated by the spindle motor 311, the temperature of the irradiated portion of the light spot 313 on the recording layer 307a immediately drops after the light spot passes. At this time, the magnetic head 305
The coil 303 provided in the
When a magnetic field is applied to the region in which is formed, the recording layer 307a is magnetized with the isotherm of the Curie point as a boundary. The recording layer 307a is switched by switching the direction of energizing the coil 303.
By changing the direction of the magnetic field applied to the portion of the light spot 313, the recording / erasing of the information signal is performed on the recording layer 307a.

In such a magnetic head 305,
Since it is necessary to apply a magnetic field having a certain strength or higher to the recording layer 307a, the magnetic field generating portion of the magnetic head 305 should be located as close as possible to the magneto-optical recording medium 307. Example 3
In the example, the magneto-optical recording medium 307 is contacted. Since the magnetic head 305 is constantly in contact with the contact portion with the magneto-optical recording medium 307 via the contact 304 made of a fluorocarbon resin member, stick-slip or the like does not occur and an extremely good contact state can be maintained. It is possible. Further, according to the third embodiment, since the surface of the recording layer 307a is coated with the acrylic resin 307b, the compatibility with the fluororesin contactor 304 is extremely good, and the friction coefficient between them is extremely low.

(Embodiment 4) A magnetic head according to Embodiment 4 of the present invention will be described with reference to the drawings. FIG. 11 is a cross-sectional view of essential parts of a magnetic head of Example 4 of the present invention. The recording / erasing of information on / from the magneto-optical recording medium is the same as that in the third embodiment, and thus the description thereof is omitted.

A center pin 402 formed integrally with the cylindrical core 401 is provided with a coil 403. By energizing the coil 403, the center pin 402
A magnetic field is generated from the end portion 402a of the. Cylindrical core 401
A hole 401a for drawing out the lead wire 403a of the coil 403 is formed in the. The hole 401a may have a notch shape. Since the cylindrical core 401 is made of a material such as ferrite, it forms a magnetic path. The center pin 402 and the cylindrical core 401 are substantially concentrically polished into spherical surfaces. Magnetic field generator 402 of center pin 402
A is coated with, for example, a fluorine-based resin to form a contact 404. Coating thickness is 20 ~
Since the thickness is about 200 μm, the necessary magnetic field on the recording surface can be sufficiently secured, and the wear characteristics are extremely good. The coating material of the contactor 404 may be a polyimide resin or the like as long as it is a material having excellent wear resistance and slidability.

According to the fourth embodiment, since the magnetic field generating portion 402a of the center pin 402 is coated with the fluororesin and the coating portion is in contact with the magneto-optical recording medium, the magnetic field generating portion is surely magneto-optical. Touch the recording medium. Further, since the surfaces of the center pin 402 and the core 401 facing the magneto-optical recording medium are originally substantially concentrically polished,
Even if the magneto-optical recording medium has surface waviness or waviness, the cylindrical core 401 does not come into contact with the magneto-optical recording medium.

As described above, the magnetic head of the fourth embodiment is
Since the magneto-optical recording medium is constantly in contact with the magneto-optical recording medium via the contact 404, stick-slip or the like does not occur, and the magneto-optical recording medium is extremely well contacted.

(Fifth Embodiment) A magnetic head according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a cross-sectional view of essential parts of a magnetic head of Example 5 of the present invention. The recording / erasing of information on / from the magneto-optical recording medium is the same as that in the third embodiment, and thus the description thereof is omitted.

The center pin 502 integrally formed with the cylindrical core 501 is provided with a coil 503. By energizing the coil 503, the center pin 502
A magnetic field is generated from the end 502a. Cylindrical core 501
A hole 501a for drawing out the lead wire 503a of the coil 503 is formed in the. The hole 501a may have a notch shape. Since the cylindrical core 501 is made of a material such as ferrite, it forms a magnetic path. The center pin 502 projects from the end surface 501b of the cylindrical core 501, and the magnetic field generation portion of the center pin 502 has
For example, a contactor 504 coated with a fluororesin
Is formed. Coating thickness is 20-200μ
Since it is about m, the required magnetic field on the recording surface of the magneto-optical recording medium can be secured, and the wear characteristics are very good. The coated material may be a polyimide resin or the like as long as it has excellent wear resistance and slidability.

According to the fifth embodiment, since only the magnetic field generating portion 502a of the center pin 502 is coated with the fluororesin and the contactor 504 is formed and is in contact with the magneto-optical recording medium, the magnetic field generating portion surely emits light. Contact the magnetic recording medium. Further, since the center pin 502 projects more than the cylindrical core 501, even if the magneto-optical recording medium has surface wobbling or waviness, the end portion 501b of the cylindrical core 501 does not come into contact with the magneto-optical recording medium.

When the center pin 502 is projected more than the cylindrical core 501 as in the fifth embodiment, masking at the time of coating becomes easy. A masking plate 505 having a hole through which the center pin 502 can be inserted is attached to the cylindrical core 50.
It is arranged so as to abut the end portion 501b of No. 1 and only the projecting portion of the center pin 502 is projected from the hole of the masking plate. For example, a powder of a fluorine-based resin is sprayed on the protrusion and then baked to form a contactor 504. When coating is performed in this manner, reliable coating can be performed extremely easily.

As described above, the magnetic head of the fifth embodiment is
Since it is always in contact with the magneto-optical recording medium via the contactor 504, it is possible to make a very good contact without the occurrence of stick slip.

(Embodiment 6) A magnetic head according to Embodiment 6 of the present invention will be described with reference to the drawings. FIG. 13 is a cross-sectional view of essential parts of a magnetic head of Example 6 of the present invention. The recording / erasing of information on / from the magneto-optical recording medium is the same as that in the third embodiment, and thus the description thereof is omitted.

A center pin 602 integrally formed with the cylindrical core 601 is provided with a coil 603. By energizing the coil 603, the center pin 602
A magnetic field is generated from the end face 602a. Cylindrical core 601
Since is formed of a material such as ferrite, it forms a magnetic path. End face 601a of cylindrical core 601
Is coated with, for example, a fluorine-based resin to form a contactor 604. Coating thickness is 20-2
It is about 00 μm. Magnetic field generator 6 of center pin 602
02a is on the same plane as the end surface 601a of the cylindrical core 601. Therefore, the magnetic field generator 602a of the center pin 602 is provided.
Is recessed by the thickness of the contactor 604, so that it does not contact the magneto-optical recording medium. In addition, the center pin 60
Since the gap between the second magnetic field generation unit 602a and the magneto-optical recording medium is only the thickness of the contact, the required magnetic field on the recording surface can be sufficiently secured.

The coating material may be not only a fluorine-based resin but also a polyimide-based resin as long as it is a material having excellent wear resistance and slidability.

By the way, the center pin 602 should be as thin as possible for the purpose of reducing the inductance of the magnetic head. This is because if the inductance is large, the direction of the applied magnetic field in the recording layer of the magneto-optical recording medium cannot be switched quickly. In order to reduce this inductance, a method of reducing the number of turns of the coil 603 may be considered, but in order to obtain the same magnetic field strength in the recording layer, the current value will increase. Therefore, it is preferable to make the center pin 602 as thin as possible to reduce the inductance, but if the center pin 602 is made too thin, the mechanical strength will be lowered. According to the sixth embodiment, the end face 601a of the cylindrical core 601 is coated with resin to form the contactor 604, and the surface of the contactor 604 is in contact with the magneto-optical recording medium. The generation unit 602a does not contact the magneto-optical recording medium. That is, since the center pin 602 receives no extra force due to contact with the magneto-optical recording medium, even if the diameter of the center pin is reduced to, for example, 1 mm or less, it is not broken at all.

As described above, the magnetic head of the sixth embodiment is
Since it is in constant contact with the magneto-optical recording medium via the contactor 604 such as a fluorine-based resin member, there is no occurrence of stick-slip and the contact is extremely good. Further, since the center pin can be made thin, it is possible to provide a magnetic head having low inductance and excellent mechanical strength.

(Embodiment 7) A magnetic head according to Embodiment 7 of the present invention will be described with reference to the drawings. 14 is a perspective view of a magnetic head according to a seventh embodiment of the present invention, and FIG. 15 is a cross-sectional view of essential parts of a magnetic head according to the seventh embodiment of the present invention. The recording / erasing of information on / from the magneto-optical recording medium is the same as that in the third embodiment, and thus the description thereof is omitted.

The center core 701a of the E-shaped core 701 is provided with a coil 702. By energizing the coil 702, the end surface 701 of the center core 701a is
A magnetic field 704 is generated from b. Since the core 701 is made of a material such as ferrite, it forms a magnetic path. End surface 701 of center core 701a of core 701
The b is coated with, for example, a fluorine resin to form a contactor 703. Coating thickness is 20 ~
It is about 200 μm. End 70 of side core 701c
Since 1d is formed on the same plane as the end portion 701d of the side core 701c, there is a gap with the magneto-optical recording medium by the thickness of the contact 703, and there is no contact with the magneto-optical recording medium. .

In the magnetic head having the E-shaped core as in Example 7, a magnetic field is formed between the center core 701a and the side core 701c, so that the center core 701a and the side core 701c are arranged in the radial direction of the magneto-optical recording medium. It is characterized in that the range of the recording magnetic field can be widened by arranging at. The coating material may be not only a fluorine resin but also a polyimide resin as long as it is a material having excellent wear resistance and slidability.

As described above, the magnetic head of the seventh embodiment is
Since it is constantly in contact with the magneto-optical recording medium via the contact 703 such as a fluorine-based resin member, stick-slip or the like does not occur and the contact is extremely good. Although the contactor 703 is formed on the center core 701a, it may be formed on the side core 701c, or may be formed on both the center core 701a and the side core 701c. Further, a part or all of the core 701 and the coil 702 may be molded with a synthetic resin or the like, and the molding part may be used as a contactor of the magneto-optical recording medium.

(Embodiment 8) A magnetic head according to Embodiment 8 of the present invention will be described with reference to the drawings. FIG. 16 is a cross-sectional view of essential parts of a magnetic head of Example 8 of the present invention. The recording / erasing of information on / from the magneto-optical recording medium is the same as that in the third embodiment, and thus the description thereof is omitted.

A center pin 802 formed integrally with the cylindrical core 801 is provided with a coil 803. By energizing the coil 803, the center pin 802
A magnetic field is generated from the end of the. The cylindrical core 801 has a hole 801 for drawing out the lead wire 803a of the coil 803.
a is formed. The hole 801a may have a cutout shape. Since the cylindrical core 801 is made of a material such as ferrite, it forms a magnetic path. The center pin 802 and the cylindrical core 801 are substantially concentrically polished into spherical surfaces. Further, the tip portion 802a of the center pin 802 is impregnated with fluorine, and the tip portion 802a is in contact with the magneto-optical recording medium. Therefore, the coefficient of friction between the center pin 802 and the magneto-optical recording medium is extremely low. In addition, since stick-slip and stiction do not occur, extremely stable contact can be achieved. Furthermore, it does not damage the magneto-optical recording medium.

Further, since the surfaces of the center pin 802 and the core 801 facing the magneto-optical recording medium are spherically polished substantially concentrically,
Even if the magneto-optical recording medium has surface waviness or waviness, the cylindrical core 801 does not come into contact with the magneto-optical recording medium.

According to the eighth embodiment, fluorine is impregnated only on the tip of the center pin. However, because the masking step is omitted, the cylindrical core and the center pin, that is, the entire magnetic head core are impregnated with fluorine. May be. Further, not only the cylindrical magnetic head core but also the E-shaped core may be impregnated with fluorine.

[0057]

As described above, according to the present invention, when the magnetic head comes into contact with the magneto-optical recording medium, the contact portion of the magnetic head facing the magneto-optical recording medium is formed into a curved surface so that the magnetic head is edged. Since there is no portion, the magneto-optical recording medium is not scratched. Further, the frictional force can be reduced as compared with the conventional one, and the stick-slip and the stiction are not caused.

Furthermore, since the contact area with the magneto-optical recording medium is extremely small, it is possible to make good contact with the magneto-optical recording medium by following the surface waviness and waviness of the magneto-optical recording medium only by the suspension without using a gimbal. To be able to
It has become possible to reduce the number of parts and improve the ease of assembly.

Since the contact portion of the magnetic head facing the magneto-optical recording medium is provided with the synthetic resin, the magneto-optical recording medium can be scratched without applying a lubricant such as silicon to the magneto-optical recording medium. Is gone. Further, the frictional force can be reduced as compared with the conventional one, and the stick-slip and the stiction are not caused.

Further, since the synthetic resin is provided in the portion of the center pin facing the magneto-optical recording medium, the center pin which is the magnetic field generating portion and the magneto-optical recording medium can be surely brought into contact with each other.

Further, since the synthetic resin is provided in the magneto-optical recording medium facing portion of the cylindrical core, the center pin and the magneto-optical recording medium do not come into direct contact with each other. Therefore, even if the center pin is thinned, there is no damage or chipping. By making the center pin thinner, it is possible to reduce the inductance of the magnetic head, and it has become possible to speed up the recording and erasing of information.

Further, since the synthetic resin is formed by coating with a fluororesin or the like, it is possible to make the coefficient of friction between the magneto-optical recording medium and the magnetic head extremely small. In particular, since the disturbance torque to the spindle motor can be reduced, it becomes possible to reduce uneven rotation, that is, jitter and wow and flutter when the spindle motor is servo-controlled.

Further, since the magnetoresistive recording medium facing contact portion of the magnetic head having the E-shaped core is provided with the synthetic resin, the range of the recording magnetic field can be widened and the magneto-optical recording medium is scratched with a low friction coefficient. It is possible to provide a magnetic head that does not cause sticking and does not cause stick-slip or stiction.

Further, since at least the contact portion of the magnetic head core facing the magneto-optical recording medium is impregnated with fluorine, the magnetic head is prevented from scratching the magneto-optical recording medium. Further, it is possible to reduce the frictional force between the magnetic head and the magneto-optical recording medium as compared with the conventional one, and it is possible to prevent stick slip and stiction.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnetic head according to a first embodiment of the invention.

FIG. 2 is a schematic diagram of a magneto-optical recording device to which the magnetic head of Example 1 of the invention is applied.

FIG. 3 is a perspective view of a magnetic head according to a second embodiment of the invention.

FIG. 4 is a cross-sectional view taken along the plane A of FIG.

5 is a cross-sectional view taken along the plane B of FIG.

FIG. 6 is a schematic view of a magneto-optical recording device to which the magnetic head of Example 2 of the invention is applied.

FIG. 7 is a perspective view of a magnetic head according to a third embodiment of the invention.

FIG. 8 is a cross-sectional view of essential parts of a magnetic head according to a third embodiment of the present invention.

FIG. 9 is a schematic diagram of a magneto-optical recording device to which the magnetic head of Example 3 of the invention is applied.

FIG. 10 is an explanatory diagram for explaining recording and erasing of an information signal on a magneto-optical recording medium.

FIG. 11 is a sectional view of essential parts of a magnetic head according to a fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view of essential parts of a magnetic head of Example 5 of the invention.

FIG. 13 is a cross-sectional view of essential parts of a magnetic head of Example 6 of the invention.

FIG. 14 is a cross-sectional perspective view of essential parts of a magnetic head according to a seventh embodiment of the present invention.

FIG. 15 is a sectional view of a main portion of a magnetic head according to a seventh embodiment of the present invention.

FIG. 16 is a sectional view of essential parts of a magnetic head of Example 8 of the present invention.

FIG. 17 is a sectional view of a main part of a conventional magnetic head.

18 is a schematic diagram of a magneto-optical recording device to which the magnetic head of FIG. 17 is applied.

[Description of Reference Signs] 1, 101, 201, 305 ... Magnetic head 4, 102, 202, 306 ... Suspension 11, 111, 211, 303, 403, 503, 60
3, 702, 803 ... Coil 302, 402, 502, 602, 802 ... Center pin 108, 301, 401, 501, 601, 801 ... Cylindrical core 701 ... E-shaped core 9,208 ... Core 10, 109, 209 ... Main magnetic pole 701c ... Side core 8, 105, 205, 307 ... Magneto-optical recording medium

Claims (7)

[Claims] 1. A magnetic head of a magneto-optical recording device for recording or erasing an information signal by generating a magnetic field when used with an optical system for irradiating light, which is arranged so as to face a magneto-optical recording medium. A magnetic head of a magneto-optical recording apparatus, wherein the magneto-optical recording medium facing contact portion of the magnetic head is a curved surface. 2. A magnetic head of a magneto-optical recording device for recording or erasing an information signal by generating a magnetic field when used with an optical system for irradiating light, which is arranged so as to face a magneto-optical recording medium. A center pin provided with a coil, and a cylindrical core integrally formed with the center pin and arranged so as to enclose the center pin. By energizing the coil, a magnetic field is generated from the end of the center pin. A magnetic head of a magneto-optical recording apparatus, wherein a synthetic resin is provided at a contact portion of the magnetic head facing the magneto-optical recording medium. 3. The magnetic head of a magneto-optical recording apparatus according to claim 2, wherein the synthetic resin is provided in a portion of the center pin facing the magneto-optical recording medium. 4. The magnetic head of a magneto-optical recording apparatus according to claim 2, wherein the synthetic resin is provided in a portion of the cylindrical core facing the magneto-optical recording medium. 5. The magnetic head of a magneto-optical recording device according to claim 2, 3 or 4, wherein the synthetic resin is formed by coating with a fluorine resin or the like. 6. A magnetic head of a magneto-optical recording device for recording or erasing an information signal by generating a magnetic field when used with an optical system for irradiating light, which is arranged so as to face a magneto-optical recording medium. There is an E-shaped core,
A coil provided in the center core of the core, and a magnetic head in which a magnetic field is generated from an end of the center core by energizing the coil, and a magnetic flux returns to the side core, in the magnetic field generation unit of the center core or the side core. A magnetic head for a magneto-optical recording device, characterized in that a synthetic resin is provided at an end portion or both of them. 7. A magnetic head of a magneto-optical recording device for recording or erasing an information signal by generating a magnetic field when used with an optical system for irradiating light, which is arranged so as to face a magneto-optical recording medium. In a magnetic head capable of generating a magnetic field from a part of the core by energizing a core that forms a magnetic path and a coil provided in the core, at least the magneto-optical recording medium facing contact of the core. A magnetic head of a magneto-optical recording device, characterized in that the part is impregnated with fluorine.