JPH0581724A - Magnetic head for magneto-optical recording - Google Patents

Abstract

PURPOSE:To prevent a magneto-optical disk from being damaged when a magnetic head is brought into sliding contact on the magneto-optical disk. CONSTITUTION:A bobbin 14 on which a coil 13 is wound is mounted on a magnetic core 12 and a sliding part 16 which is in contact with and opposite to the magneto-optical disk 1 is integrally formed on the bobbin 14, and simultaneously, the magnetic head 11 is formed by rounding the sliding surface 16a of the sliding part 16.

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 method for a magneto-optical disk, a magnetic field modulation type magneto-optical recording method is known which enables overwriting by overwriting a new signal on an old signal. In this recording method, as shown in FIG. 4, an optical pickup, which irradiates a laser beam 2 on one side with a magneto-optical disk 1 having a magneto-optical recording layer of a perpendicular magnetization film interposed, is moved to the other side in synchronization with a laser spot. The magnetic field generation 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 1.

[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 the rotation while 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. 5, a magneto-optical recording layer 6 made of a perpendicular magnetization 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.

In view of the above points, the present invention provides a magnetic head for a magneto-optical recording method of a magnetic field modulation type which is capable of sliding contact without damaging a recording medium. The head is provided.

[0009]

In a magnetic head for magneto-optical recording according to the present invention, a bobbin 14 in which a coil 13 is wound around a magnetic core 12 is mounted, and a sliding portion which is in contact with the recording medium 1 is mounted on the bobbin 14. 16 are integrally provided and configured.

Further, the magnetic head for magneto-optical recording according to the present invention has a bobbin 14 in which a coil 13 is wound around a magnetic core 12.
The bobbin 14 is integrally provided with a sliding portion 16 that is in contact with the recording medium 1. At least the sliding portion 16 is formed of a self-lubricating resin material such as fluorine-based, polyacetal-based, or nylon-based material. Constitute.

Further, the magnetic head for magneto-optical recording according to the present invention has a bobbin 1 in which a coil 13 is wound around a magnetic core 12.
4 is mounted, and the surface 16a of the sliding portion 16 provided on the bobbin 14 that contacts the recording medium 1 is rounded.

[0012]

According to the present invention, since the bobbin 14 is integrally provided with the sliding portion 16 that contacts the recording medium 1, the magnetic core 12 is prevented from contacting the recording medium 1 and the magnetic head 11 is prevented.
Can be slid in contact with the recording medium 1 without being damaged. Since the bobbin 14 and the sliding portion 16 are integrally formed, the number of parts constituting the magnetic head 11 is reduced, and the magnetic head 11 can be easily manufactured and assembled.

Further, in the magnetic head 11 in which the bobbin 14 and the sliding portion 16 are integrally formed, at least the sliding portion 16
Is formed of a self-lubricating resin material such as a fluorine-based, polyacetal-based, or nylon-based resin, the slidability of the magnetic head 11 with respect to the recording medium 1 is further improved.
Not hurt.

Further, the surface 16a of the sliding portion 16 which is in contact with the recording medium 1 is rounded so that the magnetic head 11
The contact of the recording medium 1 with the recording medium 1 becomes smooth, the Russell effect of dust (effect of scraping dust) is suppressed, and attachment of dust to the head surface is avoided.

[0015]

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

FIG. 1 shows an example of the present invention. In FIG. 1, reference numeral 1 is a magneto-optical disk, 11 is a magnetic head for magneto-optical recording according to this embodiment, which slides in contact with the magneto-optical disk,
Reference numeral 18 denotes an elastic support (so-called gimbal) that supports the magnetic head 11. 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 11 includes a magnetic core 12 and a bobbin 1 mounted on the magnetic core 12 and having a coil 13 wound around it.
4 and a sliding portion 16 integrally formed at the end of the bobbin 14 and contacting the magneto-optical disk 1. The magnetic core 12 is formed of a ferrite core having an E-shaped cross section, which includes a central core 12a and a peripheral core 12b surrounding the core. The bobbin 14 has a flange portion 15 at one end and a sliding portion 1 at the other end.
6 is integrally formed, and the coil 13 is wound between the flange portion 15 and the sliding portion 16. Then, the bobbin 14 around which the coil 13 is wound is attached to the magnetic core 12 such that the central core 12a is inserted into the central hole 14a. At this time, the central core 12a and the peripheral core 12
The end portion of b is covered by the sliding portion 16 and is 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 having a radius R of about 50 mm to 100 mm (see FIG. 2). 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.

On the other hand, the bobbin 14 having the flange portion 15
The sliding portion 16 and the sliding portion 16 are integrally formed by resin injection molding. In this case, as shown in FIG. 2, the sliding portion 16 has a good lubricating property with respect to the protective film 7 of the ultraviolet curable resin of the disk 1, that is, it does not scratch, for example, fluorine-based, polyacetal-based, nylon-based, etc. Bobbin 1 using self-lubricating resin
4 can be integrally molded by so-called two-color molding using a resin having good moldability such as ABS resin. As a result, the bobbin 14 with high 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.

Further, as shown in FIG. 3, the flange portion 15
It is also possible to integrally mold both the bobbin 14 having the groove 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.

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. Further, 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 contact sliding type magnetic head 11 for magneto-optical recording can be easily manufactured and assembled. can do.

Further, when the sliding portion 16 and the bobbin 14 are integrally molded (injection molding), the sliding portion 16 is molded with a self-lubricating resin material by using, for example, two-color molding, so that the bobbin 14 can be easily molded. When molded by, the contact slidability of the magnetic head 11 with respect to the disk 1 is improved, and the highly reliable magnetic head 11 that does not damage the disk can be provided at low cost.

Further, by rounding the sliding surface 16a of the sliding portion 16 that contacts the disk 1, the disk 1
As a result, soft contact is possible, and attachment of dust to the sliding surface 16a of the head due to dust's Russell effect (effect of collecting dust) is avoided, and scratches on the disk can be prevented.

[0024]

According to the present invention, it is possible to obtain a highly reliable contact-sliding type magnetic head for magneto-optical recording which does not damage the recording medium. Therefore, it is suitable for application to, for example, a magnetic head for magneto-optical recording of an ultra-small digital recording / reproducing apparatus using a magnetic field modulation overwrite method.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing an example of a bobbin integrated with a sliding portion according to the present invention.

FIG. 3 is a cross-sectional view showing another example of the bobbin integrated with the sliding portion according to the present invention.

FIG. 4 is a configuration diagram of a magnetic field modulation type magneto-optical recording system.

FIG. 5 is a sectional view showing an example of a magneto-optical disk.

[Explanation of symbols]

 1 Magneto-optical disk 2 Laser light 3 Magnetic head 5 Base 6 Recording layer (perpendicular magnetization film) 7 Protective film 11 Magnetic head for magneto-optical recording 12 Magnetic core 13 Coil 14 Bobbin 16 Sliding part 18 Elastic support

Front Page Continuation (72) Inventor Norio Yagi 6-5 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Magne Products Co., Ltd. (72) Tomokatsu Saito 6-5 Kita-Shinagawa, Shinagawa-ku, Tokyo No. 6 Soni Magne Products Co., Ltd. (72) Inventor Tomio Ito 6-5-6 Kitashinagawa, Shinagawa-ku, Tokyo Sony Magne Products Co., Ltd. (72) Inventor Toshiro Furuuchi Shinagawa-ku, Tokyo 6-5-6 Kitashinagawa Sony Magne Products Co., Ltd. (72) Inventor Akinori Sugano 6-5-6 Kitashinagawa Shinagawa-ku, Tokyo Sony Magne Products Co., Ltd.

Claims (3)

[Claims] 1. A magnetic head for magneto-optical recording, wherein a bobbin having a coil wound around a magnetic core is mounted, and a sliding portion that contacts a recording medium is integrally provided on the bobbin. 2. A bobbin, in which a coil is wound around a magnetic core, is mounted, and a sliding portion that contacts a recording medium is integrally provided on the bobbin, and at least the sliding portion is formed of a self-lubricating resin material. A magnetic head for magneto-optical recording. 3. A magnetic head for magneto-optical recording in which a bobbin wound with a coil is mounted on a magnetic core, and a surface of a sliding portion provided on the bobbin that contacts the recording medium is rounded.