JPH05334752A - Magneto-optical recording sliding type magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable the fixation of the magnetic core in the sliding type magnetic head for magneto-optical recording to be simple, highly reliable, and automated. A head element 47 having a magnetic core mounted on a bobbin 46 around which a coil 45 is wound, and a head body having a sliding portion 49 for sliding contact with a magneto-optical disk are provided, and a taper is provided at the base of the magnetic core 44. The magnetic core 4 by providing the protrusions 58
4 is press-fitted and fixed to the core insertion portion 55 of the bobbin 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding type magnetic head for magneto-optical recording which contacts and slides on a magneto-optical recording medium to perform magneto-optical recording.

[0002]

2. Description of the Related Art One of so-called writable optical disks capable of writing, erasing and reading information by using a light beam is called a magneto-optical disk.

In this magneto-optical disk 1, as shown in FIG. 29, a magneto-optical recording layer 3 made of a perpendicularly magnetized film is provided on a transparent substrate 2 with a SiN protective film 8 interposed therebetween. A reflection film 4 made of a metal thin film, for example, an Al thin film, is laminated on the SiN protection film 8 via a SiN protection film 8, and a protection film 5 made of an ultraviolet curable resin or the like is further formed on the reflection film 4.

Magnetic recording methods and optical modulation methods are known as recording methods for magneto-optical disks.

The magnetic field modulation method enables so-called overwriting in which a new signal is overwritten on an old signal. In this magnetic field modulation type magneto-optical recording, as shown in FIG. 28, an optical pickup which irradiates a laser beam 6 on one side (substrate 2 side) with a magneto-optical disk 1 having a magneto-optical recording layer of a perpendicular magnetization film interposed therebetween is used. On the other side (protective film 5 side), magnetic field generating means that moves in synchronization with the laser spot, that is, the magnetic head 7 is arranged, and the direction of the current flowing through the magnetic head 7 is changed to change the magnetic field direction.

The magneto-optical disk 1 is rotated at a predetermined rotation speed with its center being the center of rotation.

A magnetic field corresponding to the recording signal is formed near the laser spot 6a, so that the desired rewrite portion 1A of the disk 1 is heated to a Curie temperature or higher by the laser spot 6a and demagnetized.
When the magnetic recording medium is moved from the magnetic recording medium to a temperature 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 7 is arranged at a necessary and sufficient distance d ₀ from the disk 1.

[0009]

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 7 for magneto-optical recording is generated at the time of rotation while being separated from the disk 1 by a predetermined distance d _0. The electromagnetic servo mechanism is attached so as to follow the surface wobbling (due to the inclination of the disk 1, the uneven thickness, etc.). For this reason, in a recording / reproducing device that employs a non-contact method with respect to a magneto-optical disk, there are limits to reduction of power consumption, downsizing of equipment (in particular, reduction of thickness of equipment), and the like.

Therefore, if the magnetic head is brought into contact-sliding contact with the magneto-optical disk, the magnetic head need only be supported simply, and the conventional electromagnetic servo mechanism having a large volume can be omitted. This is advantageous for reducing the power consumption of the regenerator and downsizing the device.

23 and 24 show an example of a sliding type magnetic head for magneto-optical recording developed by the present applicant.

In FIG. 23, reference numeral 1 is a magneto-optical disk. Reference numeral 11 denotes a sliding type magnetic head for magneto-optical recording as a whole, which integrally has a sliding portion 16 which comes into contact with the disk 1 at the tip of a head arm 18 made of a leaf spring having one end fixed to a head base 19. It is configured to support the magnetic head body 17. Disk 1 rotates in the direction of arrow a,
An optical pickup 20 is arranged at a position facing the head body 17 with the disk 1 interposed therebetween, and the head body 17 is sought in the disk radial direction b in cooperation with the optical pickup 20.

As shown in FIG. 23, the magnetic head body 11 has a bobbin 14 around which a coil 13 is wound, a magnetic core 12 mounted on the bobbin 14, and the end of the bobbin 14 also serves as a flange portion. And a sliding portion 16 which is formed integrally with and contacts the magneto-optical disk 1. The magnetic core 12 is formed of an E-shaped ferrite core including a central magnetic pole core 12a and a side magnetic pole core 12b. Bobbin 14
Has a flange portion 15 at one end and a sliding portion 16 integrally formed at the other end, and the coil 13 is wound between the flange portion 15 and the sliding portion 16. The magnetic core 12 has a bobbin 1 in which a central magnetic pole core 12a is wound with a coil 13.
It is mounted so as to be inserted into the center hole 14a of No. 4.
At this time, the end portions of the central magnetic pole core 12a and the side magnetic pole core 12b are covered with the sliding portion 16 and are not exposed to the outside.

The sliding surface 16a of the sliding portion 16 which comes into contact with the disk 1 is formed as a curved surface having a radius of, for example, R = 50 mm to 100 mm, and this curved surface is a spherical surface or a cylindrical surface curved in the sliding direction. can do. In the illustrated example, it is a spherical surface.

The bobbin 14 having the flange portion 15 and the sliding portion 16 are integrally formed by resin injection molding.

The bobbin 14 integrally having the sliding portion 16 is
Plastic materials with excellent slidability and heat resistance, such as polyamide, polyester, PPS, polyarylate, polyacetal, nylon, fluorine, POM
It is formed by injection molding of a system, a PET system, a modified polyamide, or the like. The magnetic core 12 has, for example, Mn-Z excellent in high frequency characteristics.
N-ferrite, Ni-Zn ferrite, etc. are used.

By the way, as a method for inserting and fixing the magnetic core 12 into the bobbin 14, in principle, FIGS.
The method shown in can be considered.

FIG. 25 shows a method of filling and fixing an instant adhesive 25 such as an epoxy adhesive between the magnetic core 22 and the core insertion hole 24a of the bobbin 24 around which the coil 23 is wound.

FIG. 26 shows the core insertion hole 24a of the bobbin 24.
This is a method in which the magnetic core 22 is inserted and then fixed by the crushing portion 26 of the bobbin 24.

FIG. 27 shows a method of press-fitting and fixing the magnetic core 22 into the core insertion hole 24a of the bobbin 24.

However, in the fixing method using the adhesive 25 shown in FIG. 25, the core insertion hole 2 of the magnetic core 22 and the bobbin 24 is used.
The workability is poor because the clearance between the 4a is kept constant and the flow of the adhesive 25 is prevented, and the work of removing the adhesive 25 is required.

The crushing portion 26 of the bobbin 24 shown in FIG.
In the fixing method according to, the clearance between the magnetic core 22 and the core insertion hole 24a is extremely highly accurate (for example, ±) so that a gap that causes rattling does not occur between the magnetic core 22 and the core insertion hole 24a of the bobbin 24. About 0.02 mm)
Must be set to.

Further, in the fixing method by press-fitting the magnetic core 22 of FIG. 27, similarly, it is necessary to set the clearance between the magnetic core 22 and the core insertion hole 24a of the bobbin 24 with extremely high accuracy (for example, about ± 0.02 mm). There is. In addition, a load is applied to the magnetic core 22 due to a temperature change, which may cause an accident such as damage to the magnetic core 22.

In view of the above points, the present invention has good workability,
Further, the present invention provides a sliding type magnetic head for magneto-optical recording in which a magnetic core can be reliably fixed in a bobbin.

[0026]

A sliding type magnetic head for magneto-optical recording according to the present invention comprises a bobbin 4 around which a coil 45 is wound.
6, a head element 47 having a magnetic core 44 mounted thereon, and a head main body 42 having a sliding portion 49 that slides in contact with the recording medium 1. The magnetic core 44 is provided with a taper portion 58 at the base thereof. The core insertion holes 55, 56 of the bobbin 46,
It is configured to be press-fitted and fixed to 57.

The magneto-optical recording sliding magnetic head according to the present invention slides in contact with the recording medium 1 and a head element 47 in which a magnetic core 44 is mounted on a bobbin 46 around which a coil 45 is wound. The head main body 42 having the sliding portion 49 is provided, and the protrusions 62, 56 are formed in the core insertion holes 55, 57 of the bobbin 46.
63 (or 64) is provided, and the magnetic core 44 is provided with the core insertion hole 5
It is configured so as to be press-fitted and fixed in 5, 56, 57.

Further, the sliding magnetic head for magneto-optical recording according to the present invention is brought into contact with and slides on the head element 47 in which the magnetic core 44 is mounted on the bobbin 46 around which the coil 45 is wound. The head main body 42 having the sliding portion 49 is provided, the tapered core insertion hole 55 is provided in the bobbin 46, and the end portions of the core insertion holes 55, 56, 57 are rounded so that the magnetic core K4 is inserted into the core insertion hole. It is configured to be press-fitted and fixed in 55, 56, 57.

Further, the sliding type magnetic head for magneto-optical recording according to the present invention has a head element 47 in which a magnetic core 44 is mounted on a bobbin 46 around which a coil 45 is wound, and a recording medium 1.
The head main body 42 having the sliding portion 49 that comes into contact with and slides on the magnetic core 44 is provided in the bobbin 46.
The protrusion 70 provided on the base of the magnetic core 44 is locked and fixed by the locking claw 71 formed at the end of the core insertion hole 55 in the state of being mounted on the magnetic cores 6, 57. ..

[0030]

In the first aspect of the invention, the tapered portion 58 is provided at the base of the magnetic core 44, and the magnetic core 44 is press-fitted into the core insertion holes 55, 56 and 57 of the bobbin 46. It is crimped and fixed between 58 and the core insertion hole 55. In this case, since it is fixed at the base of the magnetic core 44, the other core portions and the core insertion holes 55, 56,
It is not necessary to make the clearance with 57 highly accurate,
The workability of manufacturing and assembling is improved, and the magnetic core is not damaged.

In the second invention, the protrusions 62, 63 (or 64) are provided in the core insertion holes 55, 57 of the bobbin 46, and the magnetic core 44 is pressed into the core insertion holes 55, 56, 57. When the core is inserted, the protrusions 62, 63 (or 64) are crushed and the magnetic core 44 is press-fitted and fixed. In this case, since the protrusions 62, 63 (or 64) of the core insertion hole are fixed, the clearance between the other core portion and the core insertion hole does not need to be highly accurate, and the manufacturing and assembling operations are not required. Property is improved, and the magnetic core is not damaged.

In the third invention, the bobbin 46 is provided with the tapered core insertion hole 55 and the core insertion hole 5 is formed.
The end portions of 5, 56, 57 are rounded, and the magnetic core 44 is press-fitted and fixed in the core insertion holes 55, 56, 57, so that the magnetic core 44 is inserted into the core insertion hole of the bobbin 46. The positioning becomes easier. In addition, the magnetic core 44
Can be easily fixed to the bobbin 46. Therefore, workability in manufacturing and assembling is improved, and damage to the magnetic core is avoided.

In the fourth aspect of the invention, the protrusion 30 provided at the base of the magnetic core 44 with the magnetic core 44 mounted in the core insertion holes 55, 56 and 57 of the bobbin 46 is provided at the end of the core insertion hole 55. Since the magnetic core 44 is fixed by being locked by the formed locking claw portion 71, the magnetic core 44 can be easily and reliably fixed to the bobbin 46, and damage to the magnetic core 44 can be avoided. Moreover, positioning when inserting the magnetic core 44 into the core insertion hole of the bobbin 46 becomes easy.

[0034]

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

1 and 2 are principle diagrams showing an example of the present invention. In the figure, 31 is a magnetic core and 32 is a bobbin around which a coil 33 is wound. The base portion 31A of the magnetic core 31 has a tapered portion on one side thereof, which becomes narrower toward the core insertion side.
That is, the tapered protrusion 34 is provided.

Here, the inner diameter (or inner width) A of the core insertion hole 32a of the bobbin 32 is set to be larger than the width B of the magnetic core 31, and the width C of the base 31A including the tapered protrusion 34 of the magnetic core 31. Set it to be smaller. That is,
Set so that C>A> B. The taper length D and the taper angle θ of the tapered protrusion 34 are set in consideration of the insertion force of the magnetic core 31, the ease of insertion, and the like.

Then, as shown in FIG. 2, the magnetic core 31 is pressed into the core insertion hole 32a of the bobbin 32 around which the coil 33 is wound in the direction Y. By doing so, as shown in FIG. 1, the bobbin 3 is pressed by the press-fitting of the tapered protrusion 34.
2 and the magnetic core 31 are securely fixed. When the magnetic core 31 is inserted into the core insertion hole 32a, the magnetic core width B is smaller than the inner diameter A of the core insertion hole 32a, and the base 31A is tapered, so that the magnetic core 31 can be easily inserted. ..

Therefore, the workability of manufacturing and assembling is improved.
Further, since the magnetic core width B is smaller than the inner diameter A of the core insertion hole 32a, there is no fear that the magnetic core 31 will be damaged due to temperature change.

The tapered projections 34 formed on the base portion 31A of the magnetic core 31 may be provided on both sides as shown in FIG. Further, as shown in FIG. 4 or FIG. 5, a tapered protrusion 34 is provided on one side or both sides on a side surface different from FIGS. 1 and 2, and a case or a case 3 also serving as a bobbin is formed.
It can also be made to press fit into 6.

6 to 8 show an embodiment of a sliding magnetic head for magneto-optical recording using the principle of FIG.

The magnetic head 41 of this example is composed of a head body 42.
And a head arm 43 for supporting the above. The head body 42 includes a central magnetic core 44a and a side magnetic pole core 44b.
A substantially E-shaped ferrite magnetic core 44 composed of
A magnetic head element 47 mounted on the bobbin 46 wound around the 5 is formed, and an extension portion 48 extending left and right integrally with the bobbin 46 is formed at the tip of the bobbin 46, and at the free end of the extension portion 48 directly. The magnetic disk 1 is integrally formed with a sliding portion 49 that slides in contact with the magnetic disk 1.

The bobbin 46 is a terminal block 5 in which terminals 51 are planted.
2, a core portion 53, and an upper flange portion 54,
The upper flange portion 54 is formed by being divided into two, and an extension portion 48 extending leftward and rightward so as to pass between the upper flange portion 54 divided into two at the tip of the winding core portion 53 located above the upper flange portion 54. The sliding portion 49 is formed integrally with the free end thereof. The sliding portion 49 is formed such that the surface that contacts the disk surface has a radius such as a spherical surface.

The E-shaped ferrite magnetic core 44 has a core insertion hole of the bobbin 46, that is, a core insertion portion 55 in the terminal block 52.
As a result, the central magnetic core 44a has the central hole 5 of the winding core 53.
6, the both side magnetic pole cores 44b are mounted so as to pass through the through holes 57 of the terminal block 52.

In this embodiment, however, as shown in FIG. 7, a taper portion, that is, a tapered protrusion 58 is integrally formed on one side in the width direction of the base portion 44A of the E-shaped magnetic core 44, and this magnetic property is obtained. The core 44 is press-fitted and mounted in the bobbin 46.
At this time, the tapered protrusion 58 is pressed against the wall surface of the core insertion portion 55 of the terminal block 52, so that the magnetic core 44 is fixed at the insertion position.

Bobbin 46, extension portion 48 and sliding portion 49
Is integrally formed by insert molding including the terminal 51 and the head arm 43, using the above-mentioned plastic material having excellent slidability and heat resistance.

The head arm 43 has a bifurcated distal end, and the head main body 42, and therefore the terminal block 5 thereof, via a gimbal portion 60 of a predetermined width extending at right angles from both side ends thereof.
It is designed to support 2. The head arm 43 is formed of a metal material such as nickel silver, beryllium copper, phosphor bronze, etc. having a thickness of 0.02 mm to 0.3 mm.

In the head main body 42 of this embodiment, the end face of the magnetic core 44 (particularly the central magnetic pole core 44a) of the head element is smaller than the disc surface with the sliding portion 49 at the tip of the extension portion 48 in contact with the disc surface. The distance d ₁ is increased.

In the above example, the E-shaped magnetic core 31 is used as the magnetic core. However, the magnetic core is not limited to the E-shaped magnetic core 31, and the T-shaped, U-shaped and L-shaped magnetic cores shown in FIGS. 9 to 14 are used. The same effect can be obtained by using the core 31. However, the figures A and B are 9
It is a view seen from a direction different by 0 °, but is a different embodiment in which the formation position of the tapered protrusion 34 is different.

15 to 16 show other embodiments of the present invention. 7, those parts corresponding to those in FIG. 7 are designated by the same reference numerals, and a duplicate description will be omitted.

In the example of FIG. 15, the core insertion hole of the bobbin 46, that is, the inner wall surface of the core insertion portion 55 of the terminal block 52 corresponding to the central magnetic pole core 44a and / or the side magnetic pole core 4 is formed.
Protrusions 62 and 63 are formed on the inner surface of the through hole 57 through which 4b is inserted.
Is formed. These protrusions 62 and 63 may be formed on one side or both sides so as to correspond to one side surface or both side surfaces of the E-shaped magnetic core.

Further, the inner wall surfaces (four surfaces) of the core insertion portion 55 of the terminal block 52 are formed in a taper shape such that the width becomes narrower in the core insertion direction, and accordingly, the projections 62 and 63 also taper. It can be formed into a shape. The projection 63 has a through hole 5
7 only or from the through hole 57 to the core insertion portion 55 of the terminal block.
Can be formed in a tapered shape over the end portion of the.

Here, the width F of the core insertion portion 55 in which the protrusions 62 and 63 are formed is set to be smaller than the width E of the E-shaped magnetic core 44, and the opening of the core insertion portion 55 formed in a tapered shape is formed. The side width G is set larger than the width E of the magnetic core.

The number of the protrusions 62 and 63 may be either single or plural. However, in terms of balance, the through hole 5
It is desirable to combine the seven projections 63, 63 and the central projection 62 alone. The height of the protrusions 62 and 63 is 0.01 mm to 0.
If the distance F between the protrusions is about 3 mm and the width E of the magnetic core 44 is E, it is desirable that F = E- (0.05 to 0.3 mm).

In the magnetic head 65 having such a structure,
By press-fitting the magnetic core 44 into the bobbin 46 provided with the protrusions 62 and 63, the protrusions 62 and 63 are crushed and the magnetic core 44 is securely fixed to the bobbin 46.

If the magnetic core 44 is provided with a tapered protrusion 48 on the base side as shown in FIG. 15B, the taper protrusion 58 further secures the fixing.

Further, since the core insertion portion 55 of the terminal block 52 is formed in a tapered shape, the magnetic core 44 can be easily inserted.
Therefore, workability of manufacturing and assembling can be improved in combination with press-fitting and fixing of the magnetic core.

In FIG. 15, the magnetic core 44 of the core insertion portion 55 is
The projections 62 and 63 are provided on the inner wall surface corresponding to the width direction of the above. However, as shown in FIG. 16, in addition, as shown in FIG. The inner wall surface, in this example, both inner wall surfaces may be provided with tapered protrusions 64.

The height of the protrusions 64 is about 0.01 to 0.3 mm, and the width H between the protrusions 64 is H = I- (0.05) where I is the length of the magnetic core 44 in the longitudinal direction. ~ 0.3m
m) is desirable. As the magnetic core 44, FIG.
A tapered protrusion 58 may be provided on the core base as shown in FIG.

Also in the magnetic head 66 having this structure, by press-fitting the magnetic core 44 into the bobbin 46, the protrusion 64 is crushed and the magnetic core 44 is securely fixed in the bobbin 46.

The magnetic core 4 has the structure shown in FIGS.
It is also possible to use an adhesive agent together when press-fitting and fixing the 4 and the bobbin 46.

The magnetic head 65 shown in FIGS. 15 and 16 described above.
According to 66 and 66, the fixing of the magnetic core 44 to the bobbin 46 can be simplified and the fixing can be made highly reliable. Further, since the fixing is completed in a short time, the lead time can be shortened. Further, since only one position control jig is required, it is possible to manufacture and assemble without variation. Further, automation of manufacturing and assembly becomes easy.

FIG. 17 shows another embodiment of the present invention. In the figure, those parts corresponding to those in the above-mentioned FIG. 7 are designated by the same reference numerals, and a duplicate description will be omitted.

In this embodiment, the terminal block 46 is formed in a tapered shape such that the inner wall surfaces (four surfaces) of the core insertion portion 55 are gradually narrowed from the opening toward the center hole 56 and the through hole 57, respectively. At the same time, the opening edge, the edge of the central hole 56, and the edge of the through hole 57 are each rounded (R). Then, the E-shaped magnetic core 44 is press-fitted into the bobbin 46 along the tapered core insertion portion 55 to fix the magnetic core 44.

When inserting the E-shaped magnetic core 44, it is difficult to confirm the position because the central hole 56 and the through hole 57 into which the central magnetic core 44a and the both side magnetic pole cores 44b are respectively inserted are located on the far side. According to the magnetic head 68 of this example, the core insertion hole 55 is tapered toward the center hole 56 and the through hole 57, and the opening of the core insertion hole 55, each center hole 56, and each end of the through hole 57 are formed. By adding R to the rim,
The central magnetic pole core 44a and the side magnetic pole core 44b are inserted into the corresponding central hole 56 and through hole 57 so as to be guided by the taper. Therefore, without requiring skill, the magnetic core 44 can be easily attached to the bobbin 46, automation can be performed, and the work man-hour can be reduced, and the workability can be improved. At the same time, this type of magnetic head can be manufactured inexpensively and with high reliability.

18 and 19 show still another embodiment of the present invention. In the figure, those parts corresponding to those in the above-mentioned FIG. 7 are designated by the same reference numerals, and a duplicate description will be omitted.

In this example, the protrusions 70 are provided at both ends of the base portion 44A of the E-shaped magnetic core 44 in the longitudinal direction, and the inner wall of the terminal block 52 on the bobbin 46 side, that is, the magnetic core 4 is formed.
4, locking claw portions 71 having a tapered surface that inclines inward from the opening are integrally provided on both inner walls corresponding to the four protruding portions 70.

The distance J between the locking claws 71 is determined by the magnetic core 44.
Is set to be smaller than the length L in the longitudinal direction of the base portion on which the protruding portion 70 is formed and larger than the length K between the both side magnetic pole cores. The protrusion length M of the protrusion 70 is preferably about 0.5 mm, and the protrusion thickness N is preferably about 0.3 mm.
It can be arbitrarily set in consideration of insertion force, insertion ease, and the like.

Then, the magnetic core 44 is press-fitted into the bobbin 46 while being guided by the tapered locking claw portion 71, so that the magnetic core 44 is just engaged in the state where the magnetic core 44 is inserted into the core insertion portion 55. The stop claw portion 71 engages with the protruding portion 71 of the magnetic core 44, and at the same time, the side surface of the protruding portion 70 is crimped to the inner wall surface of the core insertion portion 55 to fix the magnetic core 44.

According to the magnetic head 73 having such a structure, the bobbin 46 and the magnetic core 44 can be fixed and positioned in a short time. Further, expansion and contraction of the bobbin 44 can be ignored. Since the magnetic core 44 is press-fitted at the base portion 44A, no load is generated on the central magnetic pole core 44a and damage or the like is avoided.
Further, there is a manufacturing advantage that the accuracy of the magnetic core 44 is not required.

The magnetic core 44 is the same as that shown in FIG.
Other than the structure shown in FIG. 20, for example, FIG. 20, FIG. 21A, B, FIG.
It is also possible to use E-shaped, U-shaped, and L-shaped cores indicated by 2A and B.

[0071]

According to the sliding type magnetic head for magneto-optical recording of the present invention, the magnetic core can be mounted and fixed on the bobbin easily and reliably. Therefore, a highly reliable magnetic head can be obtained, and at the same time, the manufacturing and assembling of the magnetic head can be automated, the workability is improved, and the manufacturing can be performed with a high yield.

[Brief description of drawings]

FIG. 1 is a principle cross-sectional view showing an example of a method of fixing a magnetic core according to the present invention.

FIG. 2 is a cross-sectional view showing a step of press-fitting the magnetic core of FIG. 1 into a bobbin.

FIG. 3 is a principle cross-sectional view showing another example of a method of fixing a magnetic core according to the present invention.

FIG. 4 is a principle cross-sectional view showing still another example of the method of fixing the magnetic core according to the present invention.

FIG. 5 is a principle cross-sectional view showing still another example of the method of fixing a magnetic core according to the present invention.

FIG. 6 is a perspective view showing an example of a sliding magnetic head for magneto-optical recording according to the present invention.

FIG. 7 is an exploded view showing a partial cross section of a main part of the magnetic head of FIG.

8 is a sectional view of the magnetic head of FIG.

FIG. 9 is a view of an example of a T-shaped magnetic core applied to the present invention as seen from one side. B is a view of another example of the T-shaped magnetic core applied to the present invention viewed from the other side.

FIG. 10 is a view of another example of the T-shaped magnetic core applied to the present invention as seen from one surface. B is a view of the T-shaped magnetic core applied to the present invention as seen from the other surface of still another example.

11A is a view of an example of a U-shaped magnetic core applied to the present invention as seen from one side. FIG. B is a view of another example of the U-shaped magnetic core applied to the present invention viewed from the other side.

FIG. 12 is a view of another example of the U-shaped magnetic core applied to the present invention as seen from one side. B is a view of the U-shaped magnetic core applied to the present invention as seen from the other surface of still another example.

FIG. 13A is a view of an example of an L-shaped magnetic core applied to the present invention as seen from one side. B is a view of another example of the L-shaped magnetic core applied to the present invention as seen from the other surface.

14A is a view of another example of the L-shaped magnetic core applied to the present invention as seen from one surface. FIG. B is a view of the L-shaped magnetic core applied to the present invention as seen from the other surface of still another example.

15A is an exploded view showing another example of the sliding magnetic head for magneto-optical recording according to the present invention with a partial cross-section of a main part. FIG. B is a perspective view of another example of a magnetic core applied.

16A is an exploded view showing another example of the sliding magnetic head for magneto-optical recording according to the present invention with a partial cross section of the main part. FIG. B is a perspective view of another example of a magnetic core applied.

FIG. 17 is an exploded view showing another example of the sliding magnetic head for magneto-optical recording according to the present invention, which is a partial cross section of a main part.

FIG. 18 is an exploded view showing another example of the sliding magnetic head for magneto-optical recording according to the present invention, which is a partial cross-section of a main part.

19 is a cross-sectional view of the magnetic head of FIG.

FIG. 20 is a perspective view showing another example of an E-shaped magnetic core applied to the present invention.

21A is a perspective view showing an example of a U-shaped magnetic core applied to the present invention. FIG. B is a perspective view showing another example of the U-shaped magnetic core applied to the present invention. FIG.

22A is a perspective view showing an example of an L-shaped magnetic core applied to the present invention. FIG. B is a perspective view showing another example of an L-shaped magnetic core applied to the present invention. FIG.

FIG. 23 is a schematic configuration diagram of a sliding magnetic head for magneto-optical recording.

FIG. 24 is a cross-sectional view showing an example of a magnetic head body.

FIG. 25 is a principle sectional view showing a method of fixing a magnetic core of a comparative example.

FIG. 26 is a principle sectional view showing a method of fixing a magnetic core of a comparative example.

FIG. 27 is a principle sectional view showing a method of fixing a magnetic core of a comparative example.

FIG. 28 is an explanatory diagram of a magnetic field modulation method.

FIG. 29 is a sectional view of a magneto-optical disk.

[Explanation of symbols]

 1 Magneto-optical disk 12, 31, 44 Magnetic core 13, 33, 45 Coil 14, 32, 46 Bobbin 16, 49 Sliding part 33, 58 Tapered projection 41 Sliding magnetic head for magneto-optical recording 42 Head body 43 Head Arm 47 Head element 48 Extension portion 51 Terminal 52 Terminal block 53 Winding core portion 54 Upper flange portion 55 Core insertion portion 56 Center hole 57 Through hole 62, 63, 64 Protrusion R are 70 Protrusion portion 71 Locking claw portion

Claims (4)

[Claims] 1. A head element having a magnetic core mounted on a bobbin around which a coil is wound, and a head body having a sliding portion that slides in contact with a recording medium, wherein a taper portion is provided at the base of the magnetic core. And the magnetic core is press-fitted and fixed in the core insertion hole of the bobbin. 2. A head element having a magnetic core mounted on a bobbin around which a coil is wound, and a head main body having a sliding portion that slides in contact with a recording medium. A sliding magnetic head for magneto-optical recording, wherein the magnetic core is provided and fixed by press-fitting in the core insertion hole. 3. A head element having a magnetic core mounted on a bobbin around which a coil is wound, and a head body having a sliding portion for sliding contact with a recording medium, wherein the bobbin has a tapered core insertion hole. A sliding type magnetic head for magneto-optical recording, which is provided and has a rounded end portion of the core insertion hole, and the magnetic core is press-fitted and fixed in the core insertion hole. 4. A head element having a magnetic core mounted on a bobbin around which a coil is wound, and a head body having a sliding portion for sliding contact with a recording medium, wherein the magnetic core is a core insertion hole of the bobbin. Mounted on the magnetic core, the protrusion provided on the base of the magnetic core is locked by a locking claw formed at the end of the core insertion hole. head.