JPH0581728A - Magnetic head for magneto-optical recording - Google Patents

Abstract

PURPOSE:To prevent a magneto-optical disk from being damaged when a magnetic head for a magneto-optical recording is brought into sliding contact on the magneto-optical disk, and simultaneously, to improve the performance of an elastic support which is supporting the magnetic head. CONSTITUTION:A magnetic head main body 17 having a sliding part 16 which is opposite to and in contact with the magneto-optical disk 1 and mounting a bobbin 14 around which a coil 13 is wound on a magnetic core 12, is held by the elastic support 18. Also, the elastic support 18 is formed by a head main body attaching part 21 made of engineering plastic material and a metallic spring member 22 connecting with the member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for magneto-optical recording.

[0002]

2. Description of the Related Art Conventionally, as a recording system for a magneto-optical disk, a magnetic field modulation type magneto-optical recording system capable of overwriting by writing a new signal on an old signal is known.
In this recording method, as shown in FIG. 3, an optical pickup, which irradiates a laser beam 2 on one side with a magneto-optical disk 1 having a magneto-optical recording layer formed of a perpendicular magnetization film, is moved to the other side in synchronization with a laser spot. The magnetic field generating means, that is, the magnetic head 3 is arranged, and the direction of the magnetic field is changed by changing the direction of the current flowing through the magnetic head 3. Then, a magnetic field corresponding to the recording signal is formed in the vicinity of the laser spot, so that the rewritable portion 1A of the disc 1 is heated to a Curie temperature or higher by the laser spot 2a and demagnetized, and then moved from the laser spot 2a. When the temperature drops below the Curie temperature, the recording is performed by magnetizing in the magnetic field direction.

The conventional magneto-optical disk 1 is a non-contact medium, and therefore the magnetic head 3 is arranged at a necessary and sufficient distance d from the disk.

[0004]

The present applicant has previously developed a microminiature digital recording / reproducing device capable of digital recording / reproducing with a microminiature magneto-optical disk. This recording / reproducing device adopts a magnetic field modulation type magneto-optical recording system to enable overwriting.

By the way, since the conventional magneto-optical disk records in a non-contact manner as described above, the magnetic head 3 for magneto-optical recording follows the surface wobbling of the disk 1 caused by rotation in a state of being separated from the disk 1. Is attached to the electromagnetic servo mechanism. Therefore, in a recording / reproducing device that uses a non-contact method with respect to a magneto-optical disk, the power consumption is reduced and the device is downsized (especially, the thickness of the device is reduced).
There is a limit to the amount.

Therefore, if the conventional idea is reversed and the magnetic head is brought into contact with and slid on the magneto-optical disk, the magnetic head need only be supported by a simple elastic support.
The electromagnetic servo mechanism which takes a conventional volume can be omitted, which is advantageous for reducing the power consumption of the recording / reproducing device and downsizing the device.

However, in the magneto-optical disk 1 itself, as shown in FIG. 4, a magneto-optical recording layer 6 made of a perpendicularly magnetized film is formed on a base 5, and a protective film 7 made of an ultraviolet curable resin is further formed thereon. Is configured. When the magnetic head 3 made of a ferrite core is brought into contact with and slid on the magneto-optical disk 1 as described above, the magneto-optical disk 1 may be damaged because the compatibility between the ferrite core and the protective film 7 is poor. On the other hand, the magnetic head is held by an elastic support (so-called gimbal), and it is desirable that this elastic support be able to follow the displacement (surface deflection) of the magneto-optical disk well and absorb the vibration of the head part. ..

In view of the above points, the present invention allows a magnetic head used in a magnetic field modulation magneto-optical recording system to slide in contact without damaging the recording medium, and at the same time, to follow the displacement of the recording medium. The present invention provides a contact-sliding type magnetic head for magneto-optical recording, which secures the property and simultaneously secures stable characteristics by absorbing head vibration.

[0009]

A magnetic head 11 for magneto-optical recording according to the present invention has a sliding portion 16 which contacts the recording medium 1.
And a head main body 17 having a bobbin 14 in which the coil 13 is wound around the magnetic core 12 is held by an elastic support 18, and the elastic support 18 is provided with a head main body mounting portion 21 made of an engineering plastic material. , And the metal spring member 22 connected to the mounting portion 21.

[0010]

With the magnetic head 11 for magneto-optical recording according to the present invention, by having the sliding portion 16 that is in contact with the recording medium 1, contact of the magnetic core 12 with the recording medium 1 can be avoided.
The magnetic head can be brought into contact sliding contact with the recording medium 1 without damaging it.

The elastic support 18 for holding the head main body 17 is formed of a composite member of engineering plastic material and metal spring material 22, and the head main body 17 is mounted on the mounting portion 21 made of engineering plastic material. Head body 1 for surface runout 1
The followability of 7 can be secured by the metal spring member 22, and at the same time, the vibration of the head body 17 is absorbed by the mounting portion 21 of the engineering plastic material, and stable characteristics can be secured.

[0012]

Embodiments of the magnetic head for magneto-optical recording according to the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, reference numeral 1 is a magneto-optical disk, and 11 is a magneto-optical recording magnetic head according to the present embodiment, which is slid on the magneto-optical disk 1 in contact therewith.
Reference numeral 1 is composed of a head body 17 and an elastic support 18 (so-called gimbal) that holds the head body 17. The magneto-optical disk 1 is formed by forming a magneto-optical recording layer 6 made of a perpendicular magnetization film on a base 5, and forming a protective film 7 made of an ultraviolet curable resin on the recording layer 6.

The magnetic head main body 17 is formed integrally with the magnetic core 12, a bobbin 14 mounted on the magnetic core 12 and wound with a coil 13, and a bobbin 14 integrally formed at the end of the bobbin 14. And a sliding portion 16 in contact therewith.
The magnetic core 12 includes a central core 12a and a peripheral core 12 that surrounds the central core 12a.
It is formed of a ferrite core having an E-shaped cross section formed of b.
The bobbin 14 has a flange portion 15 at one end, and a sliding portion 16 is integrally formed at the other end, and the coil 13 is wound between the flange portion 15 and the sliding portion 16. The bobbin 14 around which the coil 13 is wound has a center hole 14a.
The magnetic core 12 is formed by inserting the central core 12a therein.
Be attached to. At this time, the end portions of the central core 12a and the peripheral core 12b are covered by the sliding portion 16 and are not exposed to the outside.

The sliding surface 16a of the sliding portion 16 which comes into contact with the disk 1 is formed into a curved surface with a radius R of about 50 mm to 100 mm. The curved surface may be a spherical surface or a cylindrical surface curved in the sliding direction. In this example, it is a spherical surface.

The bobbin 14 having the flange portion 15 and the sliding portion 16 are integrally formed by resin injection molding. In this case, the sliding portion 16 is made of a self-lubricating resin such as a fluorine-based resin, a polyacetal-based resin, or a nylon-based resin that has a good lubricating property with respect to the protective film 7 of the ultraviolet curable resin of the disk 1, that is, does not damage the protective film 7. The bobbin 14 can be integrally formed by so-called two-color molding using a resin having good moldability such as ABS resin. As a result, the bobbin 14 with good molding accuracy can be obtained, and the sliding portion 16 with good lubricity with respect to the protective film 7 of the disk 1 can be obtained. It is also possible to integrally mold the bobbin 14 having the flange portion 15 and the sliding portion 16 with a self-lubricating resin. For example, since the polyacetal resin has both self-lubricating property and moldability, the bobbin 14 and the sliding portion 16 can be integrally molded by using this polyacetal resin.

On the other hand, the elastic support 18 is composed of a composite member. That is, as shown in FIG. 2, the head body 17 is directly attached, for example, PPS (polyphenylene sulfide),
A head body mounting portion 21 made of an engineering plastic material such as PEEK (polyether ether ketone) or LCP (liquid crystal polymer), and this head body mounting portion 2
The elastic support 18 is formed by the flat plate-shaped metal spring member 22 made of, for example, SUS material or the like, which is connected to 1. The metal spring member 22 has, for example, a rectangular shape, and a quadrangular opening 23 is formed at one end thereof. For example, the metal spring member 22 made of SUS is arranged so as to be fixed to both side portions 22A and 22B facing each other with the opening of the metal spring member 22 interposed therebetween.

The elastic support 18 can be integrally formed by incorporating the metal spring member 22 when the engineering plastic material forming the head body mounting portion 21 is injection-molded. By attaching the magnetic head body 17 to the head body attaching portion 21 of the elastic support 18, the contact-sliding type magneto-optical recording magnetic head 11 according to the present embodiment is constructed.

According to the above-described embodiment, by providing the sliding portion 16 which is in contact with the disc 1 integrally with the bobbin 14 so as to cover the tip end portion of the magnetic core 12, the magnetic core 12 is brought into contact with the disc 1. This can be avoided, and the magnetic head 11 can be smoothly slid on the disk 1 without damaging the protective film 7 of the disk 1.

In this magnetic head 11, since the sliding portion 16 is formed integrally with the bobbin 14, the number of parts constituting the magnetic head 11 can be reduced, and the manufacture and assembly can be facilitated. When the sliding portion 16 and the bobbin 14 are integrally molded, for example, two-color molding is used to mold the sliding portion 16 with a self-lubricating resin, and when the bobbin 14 is molded with a resin material that is easy to mold, The contact slidability with respect to the disk 1 is improved, and the highly reliable magnetic head 11 that does not damage the disk 1 can be provided at low cost. Further, by providing the sliding surface 16a of the sliding portion 16 which comes into contact with the disk 1 with a radius, soft contact can be made to the disk 1 and the head can be slid by the Russell effect of dust (effect of scraping dust). The attachment of dust to the moving surface is avoided.

Furthermore, by forming a metal spring member 22 in which the elastic support member 18 is connected to the head body mounting portion 21 made of an engineering plastic material, the metal spring member 22 has a followability of the head with respect to the surface wobbling of the disk 1.
The vibration of the magnetic head body 17 is absorbed by the mounting portion 21 of the engineering plastic material, and stable characteristics can be secured. Therefore, it is possible to obtain a highly reliable and downsized contact sliding type magnetic head 11 for magneto-optical recording.

[0022]

According to the present invention, a highly reliable magnetic head for magneto-optical recording can be obtained without damaging the magneto-optical disk and causing no head squeal. Therefore, it is suitable for application to, for example, a magnetic head for magneto-optical recording of a microminiature digital recording / reproducing apparatus using a magnetic field modulation overwrite method.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a magnetic head for magneto-optical recording according to the present invention.

FIG. 2 is a perspective view showing an example of an elastic support body according to the present invention.

FIG. 3 is a configuration diagram of a magnetic field modulation type magneto-optical recording system.

FIG. 4 is a sectional view showing an example of a magneto-optical disk.

[Explanation of reference signs] 1 magneto-optical disk 2 laser light 3 magnetic head 5 base 6 magneto-optical recording layer 7 protective film 11 magnetic head for magneto-optical recording 12 magnetic core 13 coil 14 bobbin 16 sliding portion 17 magnetic head main body 18 elastic support Body 21 Head body mounting portion 22 Metal spring member

Claims (1)

[Claims] 1. A head main body having a sliding portion that contacts a recording medium, and a bobbin in which a coil is wound around a magnetic core is mounted on an elastic support, and the elastic support is an engineering plastic material. A magnetic head for magneto-optical recording comprising a head body mounting portion according to the above and a metal spring member connected to the mounting portion.