JPH01236412A - Magneto-optical head - Google Patents

Abstract

PURPOSE:To enable stable magneto-optical recording and reproducing by forming a resilient nonmagnetic sliding layer which comes into contact with the surface of a magneto-optical recording medium facing a magneto-optical recording medium. CONSTITUTION:A magnetic core 1 formed of a high permeability material consisting of a magnetic metallic material such as ferrite or 'SENDUST(R)' or thin magnetic film of a 'Permalloy(R)', amorphous metal, etc., and nonmagnetic bodies 2a, 2b for holding the magnetic core 1 and winding grooves 4a, 4b for forming a winding 3 are provided. The surface of a slider 5 which comes into contact with the surface of the magnetic recording medium is coated with the sliding layer 6 consisting of the nonmagnetic material having resilience. Fluoroplastic such as 'Teflon'(R), polyacetal, ultra-high-polymer polyethylene, etc., are used as the material of the sliding layer 6. The damage of the surface of the magneto-optical head such as main magnetic pole which comes into contact with the magnetic recording medium and the damage of the recording layer of the magnetic recording medium are prevented. The magneto-optical head which is improved in durability and is capable of making the stable magneto-optical recording and reproducing is thus obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical-magnetic head, and more specifically, to preventing damage to the magnetic recording medium facing surface of a magnetic core and the magnetic recording medium surface that comes into contact with the magnetic core. The present invention relates to an optical-magnetic head suitable for.

[Conventional technology]

In magneto-optical recording and reproduction, as shown in FIG.
A coil 52 is wound around the magneto-optical disk 55, and an auxiliary magnetic pole 56 is arranged to sandwich a magneto-optical disk 55 made up of a recording layer 53 and a substrate 54. These main magnetic pole 51, auxiliary magnetic pole 56, and coil 52 constitute a main magnetic pole excitation type head.

[Problem to be solved by the invention]

In the above-described optical-magnetic head, in the case of magneto-optical recording and reproducing operations, air flows between the recording layer 53 and the main pole 51 because the magnetic recording medium having the recording layer 53 rotates at high speed, Form a gap. On the other hand, when the magnetic recording/reproducing operation is stopped, the main magnetic pole 51 comes into contact with the recording layer 53 on the surface of the magnetic recording medium. In this way, the main magnetic pole 51 and the recording N53 of the magnetic recording medium are
Repeated contact and separation from the main pole 51 and the recording layer 53 on the surface of the magnetic recording medium are damaged, causing problems in magneto-optical recording and reproduction.

An object of the present invention is to solve the problems of the prior art described above, and to improve durability by preventing damage to the surface of the optical-magnetic head that contacts the magnetic recording medium, such as the main pole, and damage to the recording layer of the magnetic recording medium. The object of the present invention is to provide an opto-magnetic head capable of improved and stable opto-magnetic recording and reproduction.

[Means to solve the problem]

In order to achieve the above object, the optical-magnetic head of the present invention has a flexible non-magnetic sliding layer that contacts the surface of the optical-magnetic recording medium on the surface facing the optical-magnetic recording medium. It was formed.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a partially transparent perspective view of an embodiment of an opto-magnetic head according to the present invention.

In FIG. 1, 1 is a magnetic core made of a high magnetic permeability material such as a magnetic thin film such as a metal magnetic material such as ferrite or sendust, or a magnetic thin film such as permalloy or amorphous metal; 2a;
2b is a non-magnetic holding body for holding the magnetic core l, and has winding grooves 4a and 4b for applying the winding 3. 5 is a slider, the surface of which comes into contact with the surface of the magnetic recording medium is coated with a sliding layer 6 made of a flexible non-magnetic material.

The magnetic core l acts as a main pole and corresponds to an auxiliary pole located on the opposite side of the opto-magnetic disk.

As the sliding layer 6, fluororesin such as Teflon, polyacetal, ultra high molecular weight polyethylene, etc. are used, and Teflon etc. with high slipperiness is particularly effective. The thickness of the sliding layer 6 is preferably 1 μm or more from the viewpoint of durability, but as shown in FIG. , the thickness of the sliding layer 6 is t
In terms of magnetic field strength, t/l<1, more preferably t/l<1/2, even more preferably 171M<
It is 1/4.

Figure 3 shows the light when using the optical-magnetic head of the present invention.
FIG. 2 is a cross-sectional view showing a preferred example of a magnetic recording medium.

In FIG. 3, an opto-magnetic recording medium layer 23 is provided on a substrate 22, and a protective layer 24 is provided thereon.

The substrate 22 is made of a transparent material such as polycarbonate, epoxy resin, or glass, and the protective layer 24 is preferably made of a highly slippery fluororesin such as Teflon. In addition, from the viewpoint of durability, the thickness of the protective layer 24 is preferably thicker, but the distance from the center of the gear lub and the thickness of the main magnetic pole are also limited! Since it rapidly attenuates as a function of /l, it is undesirable to make it too thick, and the thickness is about the same as tm, preferably /2 or less, and more preferably t, 74 or less.

The operation of the opto-magnetic head constructed as described above will be explained.

When stopping magneto-optical recording, recording and reproducing by the opto-magnetic head, the sliding layer 6 on the surface of the slider 5 provided on the surface of the magnetic core (main pole) l facing the magnetic recording medium slides over the protective layer 24 of the opto-magnetic disk. It is in contact with. When the opto-magnetic disk starts rotating from this state, the sliding layer 6 and the protective layer 24 are released from the rubbed state. However, the sliding layer 6
The slider 5 on the optical-magnetic head side, the magnetic core 1 and the optical
Damage to the recording layer 23 on the magnetic head side is prevented, durability is improved, and stable magneto-optical recording and reproduction can be performed.

Also, when the optical-magnetic head stops rotating when not in use,
Contacts the optical-magnetic head and the optical-magnetic disk side. At this time, since the sliding member N6 has flexibility, it acts as a buffer material and can prevent damage to the mutual contact surfaces of the optical-magnetic head side and the optical-magnetic disk side.

The present invention is particularly useful for devices with relatively long recording wavelengths such as magnetic cards, and for devices such as magneto-optical recording, where high resolution is achieved by aperture of the irradiated light, and the applied magnetic field is applied over a relatively wide range. If the sliding layer is applied to a device in which the sliding layer may be used, it is possible to design the sliding layer to be relatively thick.

〔effect〕

As described above, according to the present invention, the optical-magnetic head side and the optical-magnetic head side
Damage caused by constant or intermittent contact between the contact surfaces of the magnetic disks can be prevented, durability can be improved, and stable magneto-optical recording and reproduction can be performed.

[Brief explanation of the drawing]

FIG. 1 is a partially transparent perspective view of an embodiment of the optical-magnetic head of the present invention, and FIG. 2 shows the relationship between the thickness of the sliding layer and the magnetic core in the optical-magnetic head of FIG. An explanatory diagram of
FIG. 3 is a sectional view showing an example of a magnetic recording medium suitable for use with the optical-magnetic head of the present invention, and FIG. 4 is an explanatory diagram showing a magneto-optical recording and reproducing system. 1...Magnetic core, 2a, 2b...Nonmagnetic holding tree 3...Winding, 4a, 4b...
Winding groove, 5...Slider, 6...Sliding layer, 22...Substrate, 23...Magneto-optical recording layer, 24... ...Protective layer, tm... Thickness of the main pole in the magnetic recording medium traveling direction, t... Thickness of the sliding layer. Agent Patent Attorney Kenji Take Department Figure 1a Figure 2! Third cause

Claims (7)

[Claims] (1) An opto-magnetic head characterized in that a flexible non-magnetic sliding layer that contacts the surface of the opto-magnetic recording medium is formed on the surface facing the opto-magnetic recording medium. (2) The optical-magnetic head according to claim 1, wherein the thickness of the sliding layer is 1 μm or more. (3) The head is composed of a main magnetic pole and an auxiliary magnetic pole, and the relationship between the thickness t_m of the main magnetic pole in the magnetic recording medium running direction and the sliding layer thickness t is ▲There are mathematical formulas, chemical formulas, tables, etc.▼ The optical-magnetic head according to claim 1, characterized in that: (4) The optical-magnetic head according to claim 1, wherein the sliding layer is made of a fluororesin. (5) The optical-magnetic head according to claim 1, wherein the sliding layer is made of polyacetal. (6) The optical-magnetic head according to claim 1, wherein the sliding layer is made of ultra-high molecular weight polyethylene. (7) The optical-magnetic head according to claim 1, wherein a protective layer is formed on the head-facing surface of the magnetic recording medium.