JPH05101473A - Production method of magnetic head for magneto-optical recording - Google Patents

Abstract

PURPOSE:To improve a mass-productivity by handling plural magnetic cores together, simultaneously performing coil winding of these cores and producing plural head elements. CONSTITUTION:First, connect plural magnetic cores 12, form a connected core body 11, perform various production processes in this condition, handle them together so as to reduce the number of processes compared against the one- by-one production. Furthermore, the amount of coil winding material 16 and the number of coil winding processes are reduced because the windings are done against the core 12 and parts feeder, take out and lining up mechanisms are simplified. And after the winding, connecting portions 15 of the cores 12 are cut to make head elements so that a number of head elements are simultaneously formed and a mass-productivity of precision magnetic heads is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing 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 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 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, 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.

In this case, the magneto-optical disk 1 itself is shown in FIG.
As shown in FIG. 3, 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 on the magneto-optical recording layer 6, so that the magnetic head 3 made of a ferrite core is formed. It is necessary to prevent the magneto-optical disc 1 from being damaged even if it is slid in contact with it.

On the other hand, the conventional magnetic head for magneto-optical recording is
It is manufactured by making one magnetic core and winding a coil around the magnetic core of the magnetic core. However, with the miniaturization of the magnetic head, the magnetic core may break if it is not handled carefully, There is a problem that it takes time to align the directions of the magnetic cores one by one.

Also, regarding the coil, a coil wire is wound in advance to form each one of the tiny coils in a hollow state, and the coil is inserted into a minute magnetic pole core, or a delicate force that does not break the magnetic pole core. Therefore, it is necessary to wind the coil wire around the magnetic core one by one. Therefore, there is a problem in that it is difficult to mass-produce the extremely small magnetic head for magneto-optical recording.

In view of the above points, the present invention provides a method of manufacturing a magnetic head for magneto-optical recording, which is suitable for mass production and is capable of contact sliding with a recording medium.

[0011]

According to the present invention, a base portion 13 is provided.
And a plurality of magnetic cores 12 each including a magnetic pole core 14 are connected to each other, and the coil wire 16 is wound around the magnetic pole cores 14 of the respective magnetic cores 12 at the same time. The head element 19 is divided from the portion 15.

[0012]

In the present invention, since a plurality of magnetic cores 12 are provided so as to be connected to each other, it is not necessary to handle each magnetic core 12 one by one as in the conventional case, the handling between steps becomes easy, and the magnetic pole cores are easily handled. Damage to 14 is also avoided.

Further, by winding the coil wire 16 around the magnetic pole core 14 of each magnetic core 12 at the same time, the number of winding steps is reduced. Furthermore, the parts feeder, take-out, and alignment mechanism can be simplified. Therefore, it becomes possible to mass-produce a very small magnetic head for magneto-optical recording.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method of manufacturing a magnetic head for magneto-optical recording according to the present invention will be described below with reference to FIGS.

In this example, first, as shown in FIG. 1A, a plurality of magnetic cores 12 made of, for example, ferrite are integrally molded in a mutually connected state to provide a connecting core body 11. Each magnetic core 12 has a magnetic pole core 14 extending vertically in the center of the upper surface of a base portion 13 integrally with the base portion 13. The magnetic cores 12 are integrally connected between the base portions 14 via a connecting portion 15. To be done. The diameter a of the magnetic pole core 14 is, for example, 0.6 to 0.
It is about 7 mm. The connection core body 11 in which the plurality of magnetic cores 12 are connected can be formed by injection molding of ferrite.

Next, as shown in FIG. 1B, an automatic winding machine (not shown) simultaneously winds the coil wire 16 around the magnetic pole cores 14 of the magnetic cores 12 in the connected state, and winds the coil 17 together. To wear.

FIG. 2C shows the connecting core body 11 after the winding of the coil 17 is completed. Next, by cutting from each connecting portion 15, FIG.
The individual head elements 19 are separated as shown in FIG.

Next, the head element 19 is fixed on a terminal block 22 which integrally has a sliding portion 21 which comes into contact with, for example, a magneto-optical disk described later. The terminal block 22 has its upper surface centered as a mounting portion for the head element 19, and has a sliding surface 21a protruding from the tip of the magnetic pole core 14 to the periphery, for example, four corners, and having its end surface contacting the magneto-optical disk. Moving part 2
1 is formed, and a pair of terminal pins 23 are further led out. After fixing the head element 19 to the terminal block 22,
The end of the coil 17 is connected to the terminal pin 23 by tangling it.

The sliding surface 21a is formed as a curved surface having a predetermined radius. 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 terminal block 22 in which the sliding portion 21 and the terminal pin 23 are integrated can be formed by injection molding of resin.
The sliding portion 21 may be formed in a ring shape, for example, in addition to the above example. In this case, the head element 19 is arranged at the center of the ring-shaped sliding portion 21.

In this way, the desired contact-sliding type magnetic head for magneto-optical recording 24 shown in FIGS. 2E and 3 is obtained. This magneto-optical recording magnetic head 24 has a sliding portion 2
1 is driven while contacting and sliding on the magneto-optical disk 1.
The magneto-optical disk 1 is constructed by forming a magneto-optical recording layer 6 made of a perpendicularly magnetized film on a base 5 and forming a protective film 7 made of an ultraviolet curable resin on the recording layer 6 as described above.

According to the embodiment described above, a plurality of magnetic cores 1
Since the connecting core body 11 having a shape in which the two are connected is formed and handling in each step is performed in the state of the connecting core body 11, efficient manufacturing can be performed. For example, it is necessary to align the magnetic cores 12 in the same direction before starting the process. In this case, since the connection core body 11 is used as a unit, a plurality of magnetic cores 12 that are connected are collectively arranged in the same direction. Be aligned. As for handling, a plurality of magnetic cores 12 can be handled at once as compared with the conventional single handling, and the number of handling steps between steps can be reduced.

Further, since the coil wire 16 is also wound around the plurality of magnetic cores 12 in the connected state at the same time, the number of coil winding steps can be reduced. Furthermore, the parts feeder and the take-out / alignment mechanism can be simplified.

After the coil winding is completed, each magnetic core 1
Since the two connecting portions 15 are cut and divided into individual head elements 19, a large number of head elements 19 can be simultaneously formed in combination with the reduction in the number of steps described above, and the magnetic head 2 with high accuracy can be obtained.
4 can improve mass productivity.

On the other hand, in the completed magnetic head 24, by providing the sliding portion 21 which comes into contact with the disk 1 so as to project from the tip of the magnetic core 19 integrally with the terminal block 22, the disk 1 of the magnetic core 12 is provided. The magnetic head 24 can be smoothly brought into contact with and slid on the disk 1 without damaging the protective film 7 of the disk 1.

Further, by rounding the sliding surface 21a of the sliding portion 21 which comes into contact with the disk 1, soft contact can be made to the disk 1 and the Russell effect of dust (effect of scraping dust) is provided. Magnetic head 2
4. Adhesion of dust to the sliding surface 21a of No. 4 is avoided. Therefore, it is possible to obtain a highly reliable and miniaturized contact sliding type magnetic head 24 for magneto-optical recording.

[0026]

According to the present invention, since a plurality of magnetic cores are collectively handled and a plurality of coils are wound around the magnetic cores at the same time, a plurality of head elements can be manufactured at the same time. The mass productivity of recording magnetic heads can be improved.

Therefore, it is suitable for application to the manufacture of a magnetic head for magneto-optical recording of an ultra-small digital recording / reproducing system using a magnetic field modulation overwrite system, for example.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram (1) of a magnetic head for magneto-optical recording according to the present invention.

FIG. 2 is a manufacturing process diagram (2) of the magnetic head for magneto-optical recording according to the present invention.

FIG. 3 is a configuration diagram of a magnetic head for magneto-optical recording 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 Magneto-optical recording layer 7 Protective film 11 Coupling core body 12 Magnetic core 13 Base part 14 Magnetic pole core 15 Coupling part 16 Coil wire rod 17 Coil 19 Head element 21 Sliding part 22 Terminal Table 23 Terminal pin 24 Magnetic head for magneto-optical recording

Claims (1)

[Claims] 1. A plurality of magnetic cores each comprising a base portion and a magnetic pole core are connected to each other, a coil wire is wound around the magnetic pole cores of the respective magnetic cores at the same time, and the magnetic core is wound after the winding of the coil wire is completed. A method of manufacturing a magnetic head for magneto-optical recording, characterized by dividing the head element into individual head elements from a connecting portion between them.