JPH04263148A - Magnetic head for magneto-optical recorder - Google Patents

Abstract

PURPOSE:To avoid head crush of a magnetic head caused by dust, etc., and improve reliability, durability and environmental resistance by a method wherein the head face of the magnetic head which is made to float so as to keep a certain gap between a magnetic disc and itself is composed of a polymer film. CONSTITUTION:The head plane E of a magnetic head 6 is composed of a polymer film 11 having a shape swelling into a circular arc toward an optical disc side. A coil 13 is applied to a magnetic core 12 to generate a magnetic field. A cymbal spring 14 presses the head plane E against the optical disc with a required pressure. Further, the head 6 is attached to a head arm 8 and is moved by a moving device together with an optical head. Moreover, the head 6 is made to keep a certain gap between the magneto-optical disc and itself by the balance of an air flow produced by the rotation of the magneto-optical disc, the spring force of the spring 14 and the rigidity of the film 11 and performs record/reproduction. With this constitution, head crush caused by the damage of the magnetic head produced by dust, etc., can be avoided and reliability, environmental resistance and durability can be improved.

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 a magneto-optical recording device that is overwritable by magnetic field modulation.

0002

2. Description of the Related Art Conventional overwritable magneto-optical recording devices include, for example, JP-A-51-107121, JP-A-59-215008, and JP-A-63-2175.
There is a method of recording information by modulating the magnetic field applied to the recording medium, as in each publication of No. 48.

FIG. 17 shows an example of the configuration of a conventional magneto-optical recording device. Reference numeral 1 denotes a magneto-optical disk, which is rotated in the direction A by a spindle motor 2. The disc 1 is a magneto-optical disk. 3 is a spindle motor drive circuit. 4 is an optical head arranged at a predetermined interval on the lower surface of the magneto-optical disk 1; 5 is an optical head drive circuit; and 6 is an optical head 4 arranged between the magneto-optical disk 1.
A magnetic head is placed opposite to the magnetic head. 7 is a suspension that biases the magnetic head 6 toward the magneto-optical disk 1, 8 is a magnetic head arm, 9 is a magnetic head drive circuit, 1
0 is a moving device for the optical head 4 and magnetic head 6.

FIG. 18 shows a detailed view of the magneto-optical disk 1 and the magnetic head 6, in which 1a is a magneto-optical recording medium, 1b is a magneto-optical recording medium, and 1b is a magneto-optical recording medium.
is a protective film. 6a is a coil of the magnetic head 6, 6b is a magnetic core, and 6c is a slider. Further, B indicates the air flow direction caused by the rotation of the magnetic flux of the magneto-optical disk 1, C indicates the laser beam of the optical head 4, D indicates the magnetic flux of the magnetic head 6, and E indicates the head surface of the magnetic head 6.

The magnetic head for the magneto-optical recording device described above has the following features:
This is a floating magnetic head in which the air flow caused by the rotation of the magneto-optical disk 1 and the load of the suspension 7 are balanced with a certain gap, and this magnetic head is made of, for example, Al2O3 -TiC.
Made of hard ceramic.

[0006]

[Problems to be Solved by the Invention] However, since the above-mentioned magneto-optical recording device is used in the atmosphere, there are problems such as head crashes due to dust, etc., that is, damage to the magnetic head, which ultimately makes it unusable. Ta.

The present invention was made in order to solve the above-mentioned problems, and aims to provide a magnetic head for a magneto-optical recording device that can eliminate head crashes and make the magneto-optical recording device highly reliable. purpose.

[0008]

[Means for Solving the Problems] A magnetic head for a magneto-optical recording device according to the present invention includes a magnetic head that applies a magnetic field whose intensity is modulated or whose polarity is reversed to a recording medium according to recorded information, and a magnetic head that applies a laser beam to the magnetic medium. A magnetic head for a magneto-optical recording device comprising an optical head that emits light to the magnetic disk is characterized in that the head surface that flies and faces the magnetic disk with a certain gap therebetween is made of a polymer film.

[0009]

In the present invention, since the head surface of the magnetic head is made of a flexible polymer film, head crushing of the magnetic head due to dust or the like can be prevented, resulting in a highly durable magnetic head.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a magnetic head for a magneto-optical recording device according to an embodiment of the present invention, in which the head surface E of the magnetic head 6 is flexible and bulges in an arc toward the magneto-optical disk (not shown). It is made up of a polymer film, and is designated by the reference numeral 11. 12 is a magnetic core, and a coil 13 for generating a magnetic field.
is wrapped. Reference numeral 14 denotes a cymbal spring for pressing the head surface E against the magneto-optical disk with a predetermined pressure. The magnetic head 6 described above is attached to a head arm 8, and is operated integrally with an optical head (not shown) by a moving device 10. Other symbols are the same as those of the conventional device explained with reference to FIG.

The magnetic head for a magneto-optical recording device according to an embodiment of the present invention, constructed as described above, is able to control the air flow generated by the rotation of the magneto-optical disk, the spring force of the cymbal spring 14, and the rigidity of the polymer film 11. Recording and reproduction are performed by balancing the magneto-optical disk with a certain gap (several μm to several tens of μm).

In particular, in the embodiment of the present invention, the head surface of the magnetic head is made of the polymer film 11, so that even if dust or the like gets caught between the magneto-optical disk and the magnetic head, the magnetic head It is possible to prevent the occurrence of head crashes due to scratches on the
This results in a magneto-optical recording device with excellent durability.

Next, some embodiments of the magnetic head for a magneto-optical recording device according to the present invention will be described.

FIG. 2 shows a configuration in which the magnetic core 12 penetrates the polymer film 11 and the end face of the core is on the same plane as the head surface E.

FIG. 3 shows the embodiment shown in FIG. 2 in which a binder 15 (equivalent to that used in magnetic tapes, etc.) is applied to the entire head surface E. Also,
By mixing ultrafine particles such as Al2O3 into the binder,
It is also soaked with liquid lubricant.

FIG. 4 shows that the end surface of the magnetic core 12 is covered with a polymer film 1.
1, a magnetic material 16 is provided on the head surface E coaxially with the magnetic core 12, and a binder 15 is applied to the head surface E at the same height as the magnetic material 16.

In FIG. 5, the magnetic core 12 penetrates the polymer film 11, the core end surface protrudes several μm to several tens of μm toward the head surface E, and the magnetic core 12 extends toward the head surface E at the same height as the protruding end surface.
A binder 15 is applied to the surface.

In FIG. 6, a magnetic core 12 is provided at a height of several μm at the center of the head surface E, and a magnetic core 12 is provided around the magnetic core 12 in FIG.
The coil 13 is formed in a spiral shape as shown in FIG. Further, the magnetic core 12 and coil 13 are protected with a binder 15 as shown in FIGS. 8 and 9.

FIG. 10 shows that after the structure shown in FIG.
6.

In FIGS. 11 and 12, the magnetic core 12 is pressed against the polymer membrane 11 by a spring 17 via a pivot 18. In FIG.
FIG. 12 shows an example in which a pivot 1 is provided on the magnetic core 12.
An example in which 8 is provided is shown below. Further, for the magnetic head having the structure shown in FIG. 6, a pivot 18 is provided on the back surface of the polymer film 11 as shown in FIG.

14 and 15, the interior surrounded by the head arm 8 and the polymer film 11 is sealed, and the polymer film 11 is pressed against the magneto-optical disk by internal pressure. 14 is filled with gas 19, and FIG. 15 shows an example filled with liquid 20.

In FIG. 16, the polymer film 11 itself is formed to have a predetermined rigidity, and is pressed against the magneto-optical disk by the elastic force of the polymer film 11. This eliminates the need for cymbal springs, gas, or liquid.

[0023]

[Effects of the Invention] As explained above, according to the present invention,
By composing the head surface of the magnetic head with a flexible polymer film, it eliminates the occurrence of head crashes caused by scratches on the head surface due to biting of dust, resulting in high reliability and
A magneto-optical recording device with excellent environmental resistance and durability can be obtained.

[Brief explanation of the drawing]

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

FIG. 2 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 3 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 4 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 5 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 6 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

7 is a front view of essential parts of the magnetic head for the magneto-optical recording device shown in FIG. 6, seen from the front; FIG.

FIG. 8 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 9 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 10 is a configuration diagram of a main part of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 11 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 12 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 13 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 14 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 15 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 16 is a configuration diagram of another embodiment of a magnetic head for a magneto-optical recording device according to the present invention.

FIG. 17 is a configuration diagram of a conventional magneto-optical recording device.

18 is a detailed configuration diagram of the magnetic head, etc. in FIG. 17; FIG.

[Explanation of symbols]

6 Magnetic head 11 Polymer membrane 12 Magnetic core 13 Coil E　Head surface

Claims (1)

[Claims] 1. A magnetic head for a magneto-optical recording device comprising a magnetic head that applies a magnetic field whose intensity is modulated or whose polarity is reversed in accordance with recorded information to a recording medium, and an optical head that irradiates the magnetic medium with laser light. 1. A magnetic head for a magneto-optical recording device, characterized in that a head surface facing a magnetic disk with a certain gap therebetween is made of a polymer film.