JP2943019B2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head having improved assemblability and performance of a magnetic head.

[0002]

2. Description of the Related Art A general description of a magnetic head will be given with reference to FIG. 8 showing a conventional example. The magnetic head has a recording / reproducing coil 4 and an erasing coil 5 fitted to legs 2 and 3 of a magnetic head core 1; The sliders 6 and 7 are bonded to both sides of the magnetic head core 1 with the magnetic head core 1 interposed therebetween. Then, a back core 8 for forming a magnetic circuit is adhered to the upper ends of the legs 2 and 3. The back core 8 is integrally connected by a non-magnetic material 9, and the legs 10 of the magnetic head core 1 are also electrically separated by a non-magnetic material 11. Leg 10
A recording / reproducing gap 12 and an erasing gap 13 are formed at the lower end of the head, and a recording / reproducing magnetic circuit is formed between the leg 2, the back core 8A, and the leg 10A through the gaps 12, 13. And one leg 3, back core 8
A magnetic circuit for erasing is formed between B and the leg 10B. Therefore, if the adhesiveness between the legs 2, 3, and 10 and the back core 8 is poor, the magnetic resistance of the portion increases, and the magnetic characteristics of the magnetic head deteriorate, and the performance of the magnetic head when using the magnetic head deteriorates. Thus, there is an organic relationship between the performance of the magnetic head and its assemblability.

FIG. 9 shows a conventional magnetic head assembly.
After the sliders 6 and 7 are adhered to both sides of the magnetic head core 1 as shown in FIG. 1, the slide surface 14 is worked, and the recording / reproducing coil 4 and the erasing coil 5 are inserted and fitted to the legs 2 and 3 from above. Thereafter, the back core 8 was adhered to the free ends of the legs 2, 3 and 10.
Japanese Patent Application Laid-Open No. 64-59612 discloses a technique of bonding a back core to a leg having a free end, similarly to the technique shown in FIG.

[0004]

The above prior art has the following problems. That is, in FIG.
The pressing force given by the jig when bonding and fixing to the legs 2, 3, and 10 is applied to this portion so that the leg 10 is sandwiched between the bonding portion 15 provided on the slider 6 and the back core 8, Since the tips of the legs 2 and 3 are free ends, no pressing force can be applied to the legs 2 and 3. Therefore, the leg portion 10 and the back core 8 are securely bonded and fixed by a large pressing force, but the bonding between the leg portions 2 and 3 and the back core 8 is securely bonded and fixed because no pressing force is applied by the jig. Can not do. As a result, there is a problem that the magnetic properties are reduced and the performance of the magnetic head is reduced due to poor adhesion between the legs 2 and 3 and the back core 8.

Further, as shown in FIG. 9, since the slide surface 14 is processed with the sliders 6 and 7 adhered and fixed to both sides of the magnetic head 1, the legs 2 and 3 having free ends are damaged in this processing step. There is a possibility that. If any of the legs 2 or 3 is broken even by a very small amount, the bonding area between the legs 2 and 3 and the back core 8 decreases,
There is a problem that the performance of the magnetic head is impaired.

A recording / reproducing coil 4 and an erasing coil 5 are fitted to the legs 2 and 3, and the legs 2, 3 and 1 are fitted.
It is conceivable to process the slide surface 14 after bonding the back core 8 to the back core 0. However, in this case, the tips of the legs 2 and 3 are still free ends.
When the slide surface 14 is processed in a state where the recording / reproducing coil 4 and the erasing coil 5 are fitted to the legs 2 and 3 having the free ends, these coils have a considerably large weight. The possibility of damaging the parts 2 and 3 increases. Further, even when the magnetic head is used, since the legs 2 and 3 have free ends and a heavy coil is fitted, there is a possibility that a torsional force is generated at the bonded portion of the two and the two are separated. There is a problem.

SUMMARY OF THE INVENTION The present invention provides a magnetic head which supports both ends of a leg to which a recording / reproducing coil and an erasing coil are fitted, assures adhesion of a back core and facilitates assembly. is there.

[0008]

According to the first aspect of the present invention,
A recording / reproducing coil and an erasing coil are fitted to the legs at both ends of a substantially E-shaped magnetic head core, and a back core forming a magnetic circuit together with the magnetic head core is adhered to the tip of the leg of the magnetic head core. In a magnetic head having a slider bonded to both sides of the magnetic head core, one of the two sliders has
The cross section in the width direction has a substantially U-shape, and both ends thereof are adhered to the magnetic head core with the medium sliding surface side and the opposite side to the medium sliding surface, and the other slider has a longitudinal cross section. Has a substantially E-shape, and the opposite sides are
Respectively on the medium sliding surface side and the opposite side of the medium sliding surface , and
The vertical side connecting the opposed sides faces the center leg of the magnetic head core, and the magnetic head core
And the back core is integrated with the end of the one slider so as to be interposed between the end of the one slider opposite to the medium sliding surface and the magnetic head core. In addition, the width of the one slider including the back core and the width of the other slider are set to different dimensions. According to a second aspect of the present invention, in the magnetic head according to the first aspect, an adhesive surface of the back core to the magnetic head core, and an adhesive surface to the magnetic head core at an end of the one slider on the medium sliding surface side. Are formed so as to be on the same plane. According to a third aspect of the present invention, in the magnetic head according to the first or second aspect, the back core includes an integrated back core for a recording / reproducing magnetic circuit and an integrated back core for an erasing magnetic circuit. I do. According to a fourth aspect of the present invention, a recording / reproducing coil and an erasing coil are fitted to both ends of a substantially E-shaped magnetic head core, and a magnetic circuit together with the magnetic head core is provided at the tip of the leg of the magnetic head core. In a magnetic head in which a back core is formed and a slider is bonded to both sides of the magnetic head core, one of the two sliders has a substantially U-shaped cross section in the width direction, The parts are adhered to the magnetic head core with the medium sliding surface side and the medium sliding surface opposite to each other, and the other slider has a substantially E-shaped cross section in the longitudinal direction. The opposing sides are respectively on the medium sliding surface side and the opposite side of the medium sliding surface , and the opposing sides are in contact with each other.
The vertical side portion continue so as to face the leg of the middle of the magnetic head core, adhering to the magnetic head core, the back core is made from the back core and a magnetic circuit for the back core erasing recording reproducing magnetic circuit, One of the back cores is integrated with the end of the one slider so as to be interposed between the end of the one slider opposite to the medium sliding surface and the magnetic head core. And the other back core is integrated with the end of the other slider so as to be interposed between the end of the other slider opposite to the medium sliding surface and the magnetic head core. Further, the width of the one slider including the one back core and the width of the other slider including the other back core are set to different dimensions.

[0009]

According to the first aspect of the present invention, the back core is connected to one of the back cores.
The end of the slider opposite to the medium sliding surface is
End of one slider so that it is interposed between
Unit. The invention according to claim 4 provides a back core.
The magnetic core for recording and reproduction and the magnetic core for erasing.
Road back core, one of which is
Is the end of one slider opposite to the medium sliding surface.
And the magnetic head core
Integrated into the end of the slider and the other back core
With the other slider on the opposite side of the medium sliding surface.
So that it is interposed between the end and the magnetic head core.
It is integrated with the other slider end.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a substantially E-shaped as shown in FIG.
The magnetic head cores, 2, 3, and 10 are leg portions (leg portions 2 and
And 3 constitute the legs at both ends, and leg 10 constitutes the central leg
I do. ) , 4 is a recording / reproducing coil, 5 is an erasing coil,
Reference numeral 12 denotes a recording / reproducing gap, and 13 denotes an erasing gap, which are not different from the conventional example. As shown in FIG.
A slider (one slider) 16 having a substantially U-shaped cross section is provided on the upper portion (opposite side of the medium sliding surface) with a back core support portion 17. The back core 19 is attached to the slider 16
Are provided integrally. This back core 19 is made of non-magnetic material
When the slider 16 is magnetically separated at 11B and the slider 16 is integrally bonded and fixed to the magnetic head core 1, the nonmagnetic material 11B
Are fixed so as to coincide with the non-magnetic portion 11A of the leg portion 10.
When the interference between the recording / reproducing magnetic circuit and the erasing magnetic circuit does not pose a problem, the nonmagnetic material 11B may be omitted and an integrated back core may be used. On the other hand, an adhesive portion 20 is provided at the lower end of the slider 16 (on the medium sliding surface side).
Precision processing is performed so that 21 and the bonding surface 22 of the back core 19 become the same surface. The slider 16 has a recess 23 having a width W1 and a height H2 corresponding to the width W1 and the height H1 of the recording / reproducing coil 4 and the erasing coil 5, respectively.
The recording / reproducing coil 4 and the erasing coil 5 are inserted and supported in the concave portion 23. On the other hand, as shown in FIG. 1, a slider (the other slider) 24 having a substantially E-shaped cross section in the length direction has a gap H2 corresponding to the height H1 of the recording / reproducing coil 4 and the erasing coil 5. The lower bonding surface 25 and the upper bonding surface 26 (the lower bonding surface 25 and the upper bonding surface 26 face each other in the present invention so that the gaps 27a and 27b are formed with a gap therebetween .
Constitute a side part. ) Is provided, and a vertical bonding surface (vertical side portion) 28 is provided so as to connect the two bonding surfaces. The slider 24 is made of a non-magnetic material.

The operation of the embodiment constructed as described above will be described below. 1 and 7, a recording / reproducing coil 4 and an erasing coil 5 are inserted and fitted to the legs 2 and 3, and the slider 16 and the slider 24 are attached to the magnetic head core 1.
Is glued to both sides so as to sandwich it. When bonding the slider, the back core 19 is integrally provided on the upper portion of the slider 16, so that the back surfaces of the legs 2, 3, and 10 on the free end side are supported by the back core 19, and , 3 and 10 are the upper adhesive surfaces 26 of the slider 24.
It is in the state where it was held down. The free ends of the legs 2, 3 and 10 thus have a back core 19 and slider 2
4 is sandwiched between the upper bonding surfaces 26 of the sliders 24, the pressing force F by the jig is adjusted by the upper bonding surfaces 26 of the slider 24 and the back core 19 sandwiching the legs 2, 3 and 10. The free ends of the legs 2, 3 and 10 are securely bonded to the back core 19 and the upper bonding surface 26 of the slider 24. Since the free ends of the legs 2, 3, and 10 are thus bonded while being held between the back core 19 and the upper bonding surface 26 of the slider 24, both ends of the legs 2, 3, and 10 are fixed. And the entire magnetic head core 1 including the legs 2, 3 and 10 is reinforced by the sliders 16 and 24. Therefore, even if the slide surface 14 is machined with the recording / reproducing coil 4 and the erasing coil 5 mounted, the entire magnetic head is rigid, so that the back core 19 and the legs 2, 3 and 10 No torsional force is generated at the bonded portion. Similarly, even when the magnetic head is used, no torsional force is generated at the bonded portion between them.

As shown in FIG. 7, the recording / reproducing coil 4 and the erasing coil 5 fitted to the legs 2 and 3 are fitted into and supported by the concave portion 23 of the slider 16 and the gap 27 between the slider 24. And one slider 16
The bonding surface 21 of the back core 19 and the bonding surface 22 of the back core 19 are in the same vertical plane, and the bonding surfaces 21 and 22 are bonded above and below the magnetic head core 1 and the other slider 24
Since the lower bonding surface 25, the upper bonding surface 26 and the vertical bonding surface 28 are bonded to the magnetic head core 1, the assembled magnetic head has a considerably large rigidity. Thus, even if the slide surface 14 is processed after assembling the magnetic head, no torsional force is generated at the bonding portion between the back core 19 and the legs 2, 3, and 10, and after the magnetic head is assembled, the slide surface 14 is formed. 14 can be processed. By processing the slide surface 14 after assembling the magnetic head in this way, the slide surface 14 is processed with high accuracy. Further, since the legs 2, 3 and 10 are sandwiched between the back core 19 provided integrally with the slider 16 and the upper adhesive surface 26 of the slider 24, the pressing force at the time of bonding these is as shown in FIG. The jig for applying this pressing force can be provided by pressing the sliders 16 and 24 in the direction of the arrow, eliminating the need for a special jig for holding the free ends of the legs 2, 3, and 10. Is simplified. In addition, the nonmagnetic agent 11B, which is adhesively bonded to the back core 19, and the nonmagnetic portion 11A of the leg portion 10 are aligned by bonding the slider 16 to the magnetic head core 1, so that the positioning of the slider 16 becomes unnecessary. Is simplified.

Next, FIGS. 2 and 3 show a second embodiment. This embodiment differs from the first embodiment shown in FIG. 1 in that the back core 19 provided integrally with the slider 16 is divided into a recording / reproducing back core 19A and an erasing back core 19B. Since the other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof will be omitted. Dividing the back core 19 into the recording / reproducing back core 19A and the erasing back core 19B in this manner has an advantage that the step of bonding the back core with the nonmagnetic agent 11B is omitted. The recording / reproducing back core 19A and the erasing back core 19
B is the back core supporting portions 17A and 17 of the slider 16
B and adhesively fixed, the slider 1
6 is adhered to the magnetic head 1 so that the non-magnetic portion 11 of the leg 10
On the other hand, the recording / reproducing back core 19A and the erasing back core 19B are adhered in a positioned state, so that the positioning between them is not required, and the assembly is simplified. The other operation is the same as that of the first embodiment, and the description thereof is omitted.

FIG. 4 shows a third embodiment. This embodiment differs from the first embodiment shown in FIG. 1 in that a back core 19 is also provided on the slider (the other slider) 24 side. Since other parts are the same as the first embodiment,
The same portions are denoted by the same reference numerals and description thereof will be omitted. The operation of the third embodiment is the same as the operation of the first embodiment, and a description thereof will be omitted.

Next, FIGS. 5 and 6 show a fourth embodiment. In the fourth embodiment, a slider 29 is provided with a back core supporting portion 17A for adhesively fixing a recording / reproducing back core 19A.
Is provided, and a part of the concave part 23 is cut away to form a cut part 30 .
5. As shown in FIG. The slider 31 has an upper bonding surface 32 formed by cutting off unnecessary portions except for a portion where the erasing back core 19B is bonded and fixed. Since other parts are the same as the first embodiment,
The same portions are denoted by the same reference numerals and description thereof will be omitted.

The operation of the fourth embodiment will be described below. In the case of this embodiment, as shown in FIG. 6, the recording / reproducing back core 19A is fixed to the legs 2 and 10 while being stretched over the legs 2 and 10, and the erasing back core 19B is attached to the legs 3 and 10.
Is adhered to the legs 3 and 10 in a state of being laid over the legs 10. In this bonding, the force F applied by the jig is the portion of the leg 10 as shown by the arrow in FIG.
Since No. 3 and No. 3 are free ends, no adhesive force is given by this jig. However, the recording / reproducing back core 19
A and the erasing back core 19B are both legs 2 and 10
And since it is adhered while being stretched over the legs 3 and 10, unlike the conventional case where it is adhered to the three legs of the legs 2, 3 and 10, the two legs are slightly Even if deformed, it becomes possible to adhere. Further, by using a jig that applies the force F1 to the legs 2 and 3 as the force applied by the jig, it is possible to ensure the adhesion.

Next, regarding the stiffness, the back cores 19A and 19B are integrally bonded to the sliders 29 and 31, so that the back cores 19A and 19B are bonded to the legs 2, 3 and 10 to obtain the magnetic head core. 1 is reinforced and the ends of the legs 2, 3 and 10 are no longer free ends, so that they have a considerably high rigidity. Therefore, as in the first embodiment, it is possible to process the slide surface 14, and no torsional force acts on the bonding portion between the back core and the leg when the magnetic head is used. Further, as in the second embodiment, since the back core is divided into two parts, the recording / reproducing back core 19A and the erasing back core 19B, the advantage that the step of bonding the back core with a nonmagnetic agent is omitted is provided. is there. Further, in this embodiment, since unnecessary portions of the slider are cut off, there is an advantage that the weight of the magnetic head is reduced.

[0018]

According to the first aspect of the present invention, a back core is provided.
The other end of the slider opposite to the medium sliding surface
One of the slides so that
The head of the magnetic head core is
Between the back core and other sliders.
You can wear it. This simplifies the bonding jig to improve the assemblability, secures the bonding between the back core and the legs, prevents an increase in magnetic resistance, and improves the performance of the magnetic head.

Also, the back core is attached to one of the sliders.
Between the magnetic head core and the opposite end of the medium sliding surface
And integrated with the end of one of the sliders
One slider and the other integrated with the back core
Since the slider described above is bonded and fixed with the magnetic head core interposed therebetween, the overall rigidity of the magnetic head is increased, and the medium sliding surface can be processed after assembling the magnetic head. As a result, the medium sliding surface can be processed with high precision, so that the performance of the magnetic head can be improved.
Further, since the rigidity is large as described above, when the magnetic head is used, no torsional force is generated at the bonding portion between the back core and the leg, and the performance of the magnetic head can be maintained for a long time. The invention according to claim 2 provides a back core.
The adhesive surface to the magnetic head core and the medium of one slider
To the magnetic head core at the end on the sliding surface side of the body
The back core is integrated because the surface is flush with the surface
Good adhesion of one slider to the magnetic head core
Can be According to a third aspect of the present invention, there is provided a magnetic recording / reproducing apparatus.
Of back core for magnetic circuit and back core for magnetic circuit for erasing
Because the back core is formed by integration,
Simplification can be achieved. The invention according to claim 4 is characterized in that
Back core for recording / reproducing magnetic circuit and erasing
And a back core for the magnetic circuit.
Lock core opposite to the media sliding surface of one slider.
Between the side end and the magnetic head core
The slider is integrated with the end of the slider and the other
Cocoa and the other slider against the medium sliding surface.
So as to be interposed between the opposite end and the magnetic head core.
And integrated with the other slider end,
One head core is integrated with one back core.
The other, which integrates one slider and the other back core
Can be glued so that it is sandwiched between the slider
You. This simplifies the bonding jig and improves the assemblability.
At the same time, secure the adhesion between the back core and the legs and
Prevent increase in resistance and improve performance of magnetic head
Can be. In addition, one back core is integrated
The other slider integrating the slider and the other back core
Ida adheres and fixes the magnetic head core,
The overall rigidity of the head increases and the magnetic head
After assembling, the media sliding surface can be processed
You. This makes it possible to process the medium sliding surface with high precision.
Thus, the performance of the magnetic head can be improved. Also,
Because of this high rigidity, using a magnetic head
Torsion occurs at the joint between the back core and the leg when
To maintain the performance of the magnetic head for a long time
Can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 3 is a front view of the slider of FIG. 2;

FIG. 4 is an exploded perspective view showing a third embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a fourth embodiment of the present invention.

FIG. 6 is a plan view showing an assembling relationship between the back core and the leg in FIG. 5;

FIG. 7 is a perspective view showing an assembled state of the first embodiment of FIG. 1;

FIG. 8 is an exploded perspective view of a conventional example.

FIG. 9 is a perspective view showing a semi-assembled state of the conventional example of FIG. 9;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 magnetic head core 2 leg 3 leg 4 recording / reproducing coil 5 erasing coil 10 leg 16 slider 19 back core 23 recess 24 slider

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-107509 (JP, A) JP-A-61-142510 (JP, A) JP-A-2-73565 (JP, A) JP-A 64-64 57415 (JP, A) JP-A-3-63917 (JP, A) JP-A-2-183414 (JP, A) JP-A-2-5105 (JP, U) (58) Fields investigated (Int. ^6, DB name) G11B 5/127 - 5/17 G11B 5/56 - 5/60

Claims (4)

(57) [Claims] A recording / reproducing coil and an erasing coil are fitted to the legs at both ends of a substantially E-shaped magnetic head core, and the magnetic head core and the magnetic head core are magnetically attached to the distal ends of the legs of the magnetic head core. In a magnetic head in which a back core forming a circuit is bonded and a slider is bonded to each side of the magnetic head core, one of the two sliders has a substantially U-shaped cross section in a width direction. Both ends are adhered to the magnetic head core with the medium sliding surface side and the medium sliding surface opposite to each other, and the other slider has a substantially E-shaped cross section in the longitudinal direction,
The opposite sides are respectively set to the medium sliding surface side and the opposite side of the medium sliding surface , and the opposite sides are connected.
A vertical side portion faces the center leg portion of the magnetic head core, and is adhered to the magnetic head core. The back core includes an end of the one slider opposite to the medium sliding surface and the magnetic head core. And the width of the one slider including the back core and the width of the other slider are set to different dimensions. A magnetic head characterized in that: 2. The magnetic head according to claim 1, wherein an adhesive surface of the back core to the magnetic head core and an adhesive surface of the one slider to the magnetic head core at an end of the one slider closer to the medium sliding surface. A magnetic head characterized in that the magnetic head is formed as follows. 3. The magnetic head according to claim 1, wherein the back core comprises an integrated back core for a recording / reproducing magnetic circuit and a back core for an erasing magnetic circuit. . 4. A recording / reproducing coil and an erasing coil are fitted to legs at both ends of a substantially E-shaped magnetic head core, and the magnetic head core and the magnetic head core are magnetically attached to the distal ends of the legs of the magnetic head core. In a magnetic head in which a back core forming a circuit is bonded and a slider is bonded to each side of the magnetic head core, one of the two sliders has a substantially U-shaped cross section in a width direction. Both ends are adhered to the magnetic head core with the medium sliding surface side and the medium sliding surface opposite to each other, and the other slider has a substantially E-shaped cross section in the longitudinal direction,
The opposite sides are respectively set to the medium sliding surface side and the opposite side of the medium sliding surface , and the opposite sides are connected.
That the vertical side portion so as to face the leg of the middle of the magnetic head core, adhering to the magnetic head core, the back core is made from the back core and a magnetic circuit for the back core erasing recording reproducing magnetic circuit, of which One back core is integrated with an end of the one slider so as to be interposed between an end of the one slider opposite to the medium sliding surface and the magnetic head core, And the other back core is integrated with the end of the other slider so as to be interposed between the end of the other slider opposite to the medium sliding surface and the magnetic head core. Further, the width of the one slider including the one back core and the width of the other slider including the other back core are set to different dimensions. De.