JPH07129908A - Magnetic head device for magneto-optical recording - Google Patents

Abstract

PURPOSE:To provide a magnetic head device for magneto-optical recording in which a magnetic core disposed in a magnetic head element is fixed in an easy method and the fixing strength of the magnetic core is maintained over a long term. CONSTITUTION:As to the magnetic head 2, tapered parts 2f and 2g where an external frame 2A made of resin is tilted toward the inside by the thermal deformation of a chip 7 are formed on the magnetic core 2a. Thus, the rear surface 2h side of the magnetic core 2a is supported in a tight contact state and the external frame 2A closes an insertion port 2C, thereby perfectly fixing the magnetic core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for magneto-optical recording in which a magnetic core is mounted on a resin holder having a sliding portion for a magneto-optical recording medium together with a coil bobbin and applied to magneto-optical recording.

[0002]

2. Description of the Related Art For example, as shown in FIG. 6, a rotatable flat disc-shaped recording medium is housed in a disc cartridge 10. In the disc cartridge 10,
A shutter member for exposing the disk-shaped recording medium is provided on both sides 10a, 10b of the disk cartridge 10 when inserted into the apparatus. The disc cartridge 10 of FIG. 6 schematically shows the shutter member in the opened state. At this time, the disc-shaped recording medium is moved in the apparatus at a predetermined rotation speed by the arrow R in FIG.
Has been rotated in the direction.

There are various recording media as the disk-shaped recording medium. The disc-shaped recording medium shown in FIG. 6 is a so-called rewritable magneto-optical disc (hereinafter referred to as a magneto-optical disc) in which an optical beam and an information signal supplied from a magnetic head can be written and read using the optical beam. ) 11

The magneto-optical disk 11 has a recording magnetic film as a recording magnetic layer formed on a transparent disk substrate. This recording magnetic film is a magnetic thin film that facilitates magnetization in the direction perpendicular to the disk substrate and uses a material having a large magneto-optical effect, for example, a magnetic Kerr effect or a Faraday effect. In the magneto-optical disk 11, a reflective film made of, for example, an Al thin film is laminated on the recording magnetic layer, and a protective film made of an ultraviolet curable resin or the like for protecting these thin films from corrosion is provided on the reflective film. Formed and configured.

When recording an information signal on the magneto-optical disk 11, the apparatus is 10b of the disk cartridge 10.
The optical pickup 12 irradiates the surface of the magneto-optical disk with laser light as a light beam from the side. By this laser light irradiation, the magneto-optical disk 11 partially raises the temperature of the recording magnetic film beyond the Curie point or the temperature compensation point. Due to this temperature rise, the recording magnetic film loses the magnetization at the irradiation position of the laser beam. After that, a new information signal to be recorded is externally applied to the position where the magnetization disappears.
A position P facing the optical pickup 12 via the magneto-optical disk 11 for applying an information signal from the outside.
A magnetic head device 13 as a magnetic field generating device is slidably arranged in the. The magnetic field head device 13 changes the direction of the recording magnetic field according to the information signal applied from the outside, that is, the direction of magnetization.

When reproducing an information signal from the magneto-optical disk 11, the magneto-optical disk 11 is irradiated with laser light via the optical pickup 12. The recorded information is reproduced according to the magneto-optical effect that the irradiated laser light is reflected by the surface of the magneto-optical disk 11.

The magnetic field head device 13 includes a magnetic head element 13a formed by winding a coil around a magnetic core, and
The magnetic head element 13a is prevented from coming into and out of contact with the magneto-optical disk 11 too much, and a supporting member 13b for exerting an urging force that always presses the magnetic head element 13a toward the surface of the magneto-optical disk 11 at the time of recording, and the supporting member 13b. The magnetic head element 13a is supported and is configured to have a sliding portion 13c for sliding contact with the magneto-optical disk 11 that is rotationally driven without directly contacting the magneto-optical disk 11. . Here, the magnetic head element 1
3a and the sliding portion 13c are generally made by integrally molding an outer frame 13d in which a magnetic core is housed in order to reduce the number of parts and the manufacturing cost.

In the magnetic head element 13a, a member to be fixed is press-fitted into the outer frame 13d of the magnetic head element 13a in order to fix the built-in magnetic core to the outer frame 13d.
It is manufactured by a method of adhering a member to be fixed inside the outer frame 13d of the magnetic head element 13a.

[0009]

By the way, in the magnetic head element, when the press-fitting method is used for fixing the magnetic coil, the press-fitting strength sometimes becomes weak due to the change with time after the press-fitting. In particular, when the magnetic head element is energized after press-fitting, heat is generated inside the magnetic head element by energization, and the resin in the outer frame of the magnetic head element is heated. This heating causes the magnetic head element to loosen or come off. Due to such a defect, the magnetic head element may prevent the magnetic field generated from the magnetic core when recording on the magneto-optical disk from reaching the recording magnetic layer of the magneto-optical disk, or the magnetic field may not be generated. It will have a fatal drawback.

When the adhesive method is used for fixing the magnetic coil, the fixing strength of the magnetic head element in the outer frame can be maintained, but an adhesive is applied to the small magnetic coil or the adhesive is solidified. It has to go through several time-consuming processes including time consuming. As described above, in the bonding method, the workability is deteriorated, resulting in a decrease in manufacturing production efficiency and an increase in manufacturing cost.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and the magnetic core arranged in the magnetic head element is fixed by a simple method to improve the fixing strength of the magnetic core. An object of the present invention is to provide a magnetic head device for magneto-optical recording that can be maintained for a long period of time.

[0012]

In order to solve the above-mentioned problems, a magnetic head device for magneto-optical recording according to the present invention is mounted on a resin holder having a magnetic core together with a coil bobbin and a sliding portion for a magneto-optical recording medium. The magnetic core is characterized in that the back side is supported by the heat deformation of the resin holder and is fixed to the resin holder.

In order to solve the above-mentioned problems, the magnetic head device for magneto-optical recording according to the present invention has a magnetic core mounted together with a coil bobbin on a resin holder having a sliding portion for the magneto-optical recording medium, After inserting the magnetic core and the coil bobbin into a resin holder having a sliding portion for the magneto-optical recording medium, a heating member is inserted into the opening of the resin holder and the magnetic core and the coil bobbin are inserted substantially in the same direction. It is pressed from the same direction and is heated and deformed so as to support the back side of the magnetic core.

[0014]

In the magnetic head device for magneto-optical recording according to the present invention, the back side of the magnetic core is supported by the heat deformation of the resin holder and is fixed to the resin holder. Compared to the conventional fixing method in which the magnetic head element is housed in the outer frame of the magnetic head element, it is possible to suppress the stress of the resin from being relaxed, and the fixing strength of the magnetic core can be kept strong, and it is possible to withstand a strong impact. .

[0015]

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

Magnetic head device 1 for magneto-optical recording of the present invention
Is a magnetic head element 2 mainly formed by winding a coil around a magnetic core, as shown in FIG. 1, and the magnetic head element 2 so as not to come into contact with or separate from the magneto-optical disk too much. A support member 3 that constantly applies a biasing force that presses the magnetic head element 2 in the magneto-optical disk surface direction, and the magnetic head element 2 that is supported by the support member 3
Is not directly in contact with the magneto-optical disk, but is in sliding contact with the magneto-optical disk being driven to rotate.

In the magnetic head device 1 for magneto-optical recording, a head arm 5 connected to an arm member (not shown) for rotating the magnetic head element 2 to a desired position has three through holes 5a and 5b, It is tightened together through 5c. With this connection, the magneto-optical recording magnetic head device 1 can be moved to a desired position on the magneto-optical disk in response to, for example, rotation by a voice coil motor. The head arm 5 is cut out in an “L shape” in order to dispose the support member 3. The member 5d on the magnetic head element 2 side of the head arm 5 is fixed as a thin thin member by screwing with a screw hole cut in a flat portion of the sliding portion 4 with a screw 5e.
An information signal indicating the direction of magnetization is supplied to the head arm 5 from the outside of the magneto-optical recording magnetic head device 1 by contact points 5f, 5f.
g. The contacts 5f and 5g are provided on the flexible substrate 6. Flexible board 6 is contact point 5
The signal lines extending from f and 5g are supplied to the magnetic head element 2. The flexible substrate 6 has a substrate shape so as to be placed on the support member 3.

The supporting member 3 has a suspension 3a having an urging force for pressing in the surface direction of the magneto-optical disk.
And the magnetic head element 2 connected to the suspension 3a.
And a supporting portion 3b that is gently inclined toward the surface of the magneto-optical disk. The suspension 3a is a metal fitting 3c in which the suspension 3a is sandwiched.
It is connected to the head arm 5 through the through holes 3d and 3e provided in. Further, both ends of the supporting portion 3b are bent into an "L shape" in order to secure the strength of this member. The inclined surface 3f of the support portion 3b is provided with a perforation opening 3g, and the magnetic head element 2 is disposed in the perforation opening 3g.

The support portion 3b has elongated support portions 3h and 3i formed by forming the hole 3g. The elongated support portions 3h and 3i are formed by bending the vertical portion 3k substantially vertically on the flat portion of the sliding portion 4. In this bent portion, a hole 3j is formed at a position where the hole 3g is extended. After the head arm 5 is screwed, the head arm 5d is slanted upward and penetrated into the hole 3j. The head arm 5d freely fits in the hole 3j. Here, in order to prevent the head arm 5d from coming off the perforation opening 3j, locking pieces 5h and 5i are provided in a direction substantially orthogonal to the vertical portion 3k.

Thus, the magnetic head device for magneto-optical recording is constructed.

Next, the magnetic head element 2 used in the magnetic head device for magneto-optical recording of the present invention will be described with reference to FIGS. 2 to 4 and the reliability of the magnetic head element with the lapse of time is shown in FIG.
Will be described with reference to. Further, FIG. 1 is also referred to when necessary. Here, the magnetic head element 2 of FIGS.
For example, the broken state shown by the one-dot chain line AA in FIG. 1 is shown.

The magnetic head element 2 has an outer frame 2A made of resin.
And a magnetic core 2a and a head portion 2B in which a coil 2b is wound around the magnetic core 2a.

The magnetic head element 2 of FIG. 2 shows a cross section in a state where the head portion 2B is inserted into the outer frame 2A. The head portion 2B is inserted in the outer frame 2A formed by, for example, injection molding from the direction of the arrow B in FIG. Head part 2
B is abutted against the inner bottom surface 2c of the outer frame 2A, and is in a state of not falling downward from this position. On the other hand, since the outer frame 2A is open in the direction opposite to the arrow B in FIG. 2, it can be freely moved.

Next, a procedure for fixing the head portion 2B of the magnetic head element 2 inside the outer frame 2A will be described. When the head portion 2B is fixedly arranged, the chip 7 containing the heating circuit 7a shown in FIG. 3 is pressed from the direction of arrow C, which is the same as the direction of insertion of arrow B in FIG. The tip 7 has an inclined surface 7 in which the shape of the tip is inclined inward.
b and 7c are formed. Therefore, the chip 7 is heated and first comes into contact with the corners 2d and 2e of the outer frame 2A which is the resin holder. Since chip 7 is heated,
The shape of the outer frame 2A is deformed. The shape of this outer frame 2A is
By the shape of the tip of the tip 7 and the pressing operation, the resin is thermally deformed to form tapered portions 2f and 2g that are inclined toward the insertion port 2C side, that is, the inside of the outer frame 2A.

Here, the heating temperature of the chip 7 is set to be equal to or higher than the heat distortion temperature of each resin shown in ASTM D648 which is one of the American standards. By carrying out at this temperature, it is possible to reduce the working time in the thermal deformation method and the stress applied to the outer frame and the magnetic core.
It can be seen that this thermal deformation method is effective from this viewpoint.

In this way, in the magnetic core 2a, the resin outer frame 2B is supported so that the rear surface 2h side of the magnetic core 2a comes into close contact with the chip 7 due to heat deformation, and the outer frame 2A closes the insertion opening 2C. , Completely fixed.

The magnetic head element (●) used in the magnetic head device for magneto-optical recording according to the present invention and the conventional press-fitting method, for example, a clearance with respect to the outer frame, by this thermal deformation to fix the head portion 2B. A magnetic head element (○) in which a -150 μm magnetic core is press-fitted and fixed is shown in FIG.
Compare using the graph. In order to see the change with time under the condition of high temperature storage, the temperature condition was set by setting the ambient temperature in the environment to 100 ° C. The horizontal axis of FIG. 5 represents the time (h) of storage at the ambient temperature, and the vertical axis represents the storage time (h).
Shows the core pull-out strength (N). The core pull-out strength means the outer frame 2A when the outer frame 2A is fixed and the central magnetic pole surface of the magnetic core 2a is pushed in the direction opposite to the inserting direction of the arrow B in FIG.
It is the one that shows the force when it comes off.

In the magnetic head element (●) used in the present invention, the core pull-out strength has a value larger than that of the conventional magnetic head element (◯) from the initial stage, and the core pull-out due to storage is retained even after aging. It can be seen that the deterioration such that the strength is lower than that of the conventional magnetic head element is not recognized. Therefore, the reliability in the long term is clearly superior to the magnetic head element manufactured by the current press-fitting method.

After the magnetic core 2a and the magnetic coil 2b wound around the coil bobbin are inserted into the outer frame 2A which is the resin holder having the sliding portion 4 for the magneto-optical recording medium, the heatable chip 7 is attached. The magnetic core 2a is pressed against the insertion opening 2C of the outer frame 2A from the insertion direction of the magnetic core 2a and the magnetic coil 2b, for example, substantially the same direction as the arrow B in FIG. Back 2h
Even if it is deformed by heating so as to support the side, the same effect as described above can be obtained.

With the above-mentioned structure, the fixing strength of the magnetic core can be reduced even when the resin stress is relaxed as compared with the fixing of the conventional magnetic head element using the press-fitting method, which is housed in the outer frame of the magnetic head element. Can be kept strong and can withstand a strong impact, and reliability can be maintained even if it changes with time, for example, at high temperature storage. Further, compared with the bonding method, the use of the press-fitting method can simplify the manufacturing process and improve the work efficiency.

[0031]

In the magnetic head device for magneto-optical recording according to the present invention, the back side of the magnetic core is supported by the heat deformation of the resin holder and is fixed to the resin holder. Compared with fixing in the outer frame of the magnetic head element in the conventional magnetic head element, the fixing strength of the magnetic core is kept strong even if the stress of the resin is relaxed, and it becomes possible to withstand a strong shock, For example, reliability can be maintained even if it changes with time due to high temperature storage. By using the press-fitting method, the manufacturing process can be simplified and the work efficiency can be improved as compared with the bonding method which is another method.

In the magnetic head device for magneto-optical recording according to the present invention, the magnetic core and the coil bobbin are inserted into a resin holder having a sliding portion for the magneto-optical recording medium, and then a heating member is attached to the resin holder. The fixing strength of the magnetic core is strongly maintained by pressing the magnetic core and the coil bobbin from the same direction as the insertion direction of the magnetic core and heating and deforming so as to support the back side of the magnetic core. Can withstand strong impact,

[Brief description of drawings]

FIG. 1 is an external perspective view of a magnetic head device for magneto-optical recording according to the present invention when viewed obliquely from above.

FIG. 2 is a cross-sectional view of the magnetic head element of the magneto-optical recording magnetic head device before a magnetic coil is fixedly arranged, taken along a broken line AA.

FIG. 3 is a cross-sectional view showing a state in which a chip is brought into contact with the magnetic head element.

FIG. 4 is a cross-sectional view showing a state in which the chip is pressed against a magnetic head element and thermally deformed.

FIG. 5 is a graph showing the core pull-out strength of a magnetic core with respect to storage time in high temperature storage.

FIG. 6 is a schematic diagram for explaining the positional relationship of each part of the recording / reproducing apparatus when the magnetic head device for magneto-optical recording is arranged on the magneto-optical disk for recording.

[Explanation of symbols]

 1 --- Magnetic head device for magneto-optical recording 2 --- Magnetic head element 3 --- Supporting member 4 ---・ ・ Sliding part 5 ・ ・ ・ ・ ・ ・ ・ ・ Head arm 6 ・ ・ ・ ・ ・ ・ ・ Flexible substrate 7 ・ ・ ・ ・ ・ ・ ・ Chip 10 ・ ・ ・ ・ ・ ・Disk cartridge 11 ... Magneto-optical disk 12 ... Optical pickup 13 ... Magnetic head device 2f, 2g Tapered parts due to thermal deformation 7c, 7d ... Tip inclined surface

Claims (2)

[Claims] 1. A magnetic core is mounted on a resin holder having a sliding portion for a magneto-optical recording medium together with a coil bobbin, and the magnetic core is supported on its back side by heat deformation of the resin holder and is made of the resin. A magnetic head device for magneto-optical recording, which is fixed to a holder. 2. A magnetic core is mounted on a resin holder having a sliding portion for a magneto-optical recording medium together with a coil bobbin, and the magnetic core and the coil bobbin are mounted on a resin holder having a sliding portion for a magneto-optical recording medium. After the insertion, the heating member is pressed against the opening of the resin holder from substantially the same direction as the insertion direction of the magnetic core and the coil bobbin, and is heated and deformed so as to support the back side of the magnetic core. A magnetic head device for magneto-optical recording characterized by the above.