JPH06111234A - Fabrication of magnetic head and jig used therein - Google Patents

Abstract

PURPOSE:To eliminate positional shift of winding to the tip side of core by disposing an anti-protrusion jig on the tip side of a head core when the winding is applied thereon. CONSTITUTION:An anti-protrusion jig 30 is secured detachably through a screw 33 to the upper part 32a of a supporting base 32 having substantially C-shaped profile. A head base 34 bonded with a head chip 31 is secured through a screw 35 to the upper part 32b opposing to the upper part 32a while opposing to the jig 30. A recess 36 is made in the jig 30 on the opposite side to the chip so that the tip part 31a of the chip 31 enters slightly into the recess 36 and the chip 31 is disposed not coming into contact with the jig 30 but through a slight gap (d) between the opposite sides at the tip part 31a of the chip and the inner wall face of the recess 36 in the jig 36. This anti-protrusion jig 30 eliminates positional shift of the winding 15 to the tip side of the core 10.

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 and a jig used for carrying out this method.

[0002]

2. Description of the Related Art Conventionally, a magnetic head 1 as shown in FIG. 17 has been used for signal recording and reproduction on a magnetic recording medium such as a magnetic tape. This magnetic head 1 is of a fixed type, and has a front core 4 having a magnetic gap 3 on a sliding surface 2 of a traveling medium and a back core 7 having windings 5 and 6.
It is manufactured by joining and integrating. And the core width W1
Is also large, for example, about 7 mm.

In manufacturing the fixed head 1, the windings 5 and 6 are wound in advance in a coil shape, and bobbins wound in advance are inserted into the columnar portions 7a and 7b of the back core 7, respectively. Is pasted. Therefore, the windings 5 and 6 can always be set in a predetermined position, and the problem of protruding from that position does not occur.

However, the rotary head of the type which is mounted on the rotary drum of the VTR is shown at 21 in FIG. 18, and the core width W2 is very small, 1 mm or less. With a core (usually made of ferrite) 10
11 and 11 are joined together to form the magnetic gap 13, and the winding 16 is applied to the core 11 through the winding hole 18.
However, this is omitted in the drawing. )There is a need.

In this winding, as shown in the drawing, the winding material comes off from the core side, especially on the tip side of the core.
It may protrude to the upper side and be wound between the sliding surface 12 and the winding hole 18. In this case, not only the performance is deteriorated but the use becomes unusable due to the reduction in the yield due to the winding defect.

Especially when the number of windings exceeds 10 turns,
When the cross-sectional area of the wound core portion exceeds 0.06 mm ² , the above-mentioned protrusion of the winding increases, and the occurrence of winding defects tends to increase.

[0007] To prevent such winding protrusion,
By forming the guide grooves 17 and 19 on the core side as described above, the position of the winding material may be regulated by the flange portions 10a and 10b on the tip side of the core. However, in such a head, it is necessary to process the guide grooves 17 and 19, and the magnetic flux easily leaks to the outside from the flange portions 10a and 10b.

For this reason, in the head of FIG. 19, when a machining defect occurs, the performance deteriorates and the output decreases due to magnetic flux leakage. For example, the core width W3 of the wound portion is set to the core width of the head of FIG. It has been confirmed that when it is set to the same as W2, the output drops by about 0.5 dB.

[0009]

The object of the present invention is to improve the production yield and output of the head as shown in FIG. 18, which does not have the guide groove, by performing good winding. Another object of the present invention is to provide a manufacturing method that can also realize the above, and a jig for preventing winding protrusion that is used for implementing this method.

[0010]

SUMMARY OF THE INVENTION That is, the present invention relates to a method of manufacturing a magnetic head, in which when a winding is applied to a head core, a jig for preventing protrusion of the winding is arranged on the tip side of the head core. Is.

This manufacturing method is particularly effective when manufacturing a rotary magnetic head having no winding guide groove.

In this manufacturing method, a jig for preventing protrusion of the winding is used, which is fixed on the support base for fixing the base to which the head core is attached, at the tip end side of the head core to which the winding is applied. Is desirable.

Further, since a part of the support for fixing the base on which the head core to which the winding is to be applied is fixed is used to prevent the winding from protruding at the tip side of the head core, It is also possible to construct a jig.

[0014]

EXAMPLES Examples of the present invention will be described below.

1 to 6 show a first embodiment in which the present invention is applied to a rotary type magnetic head.

First, the jig 30 for preventing the wire from protruding will be described in this embodiment. The jig 30 is detachably fixed to the upper portion 32a of a support base 32 having a substantially C-shaped vertical section with a screw 33. A head base 34 to which a head chip 31 is adhered is fixed to the upper portion 32b facing the upper portion 32a by a screw 35 so as to face the jig 30.

In this case, a concave portion is provided on the chip facing side of the jig 30.
36 is provided, and the tip end portion (core tip end portion) 31a of the chip 31 is slightly inserted into the recess and fixed. Specifically, as shown in FIG. 1, the chip 31 is a jig.
A slight gap d is provided between both sides of the tip end portion 31a (each side of the cores 10 and 11) and the inner wall surface of the recess 36 of the jig 30 without contacting with 30.

The gap d is smaller than the outer diameter (for example, 0.06 mm) of each winding material of the windings 15 and 16 applied to the cores 10 and 11, and the tip end portion 31a of the chip 36 is inserted into the recess 36. The amount corresponds to the region on the tip side of the winding region. In addition,
The thickness of the cores 10 and 11 is about 0.15 mm, and the core width W2 is 0.6 to 1.
It may be about 5 mm, for example about 0.7 mm.

Next, a method of winding the wire by using the jig 30 for preventing the wire from protruding will be described.

First, as shown in FIG. 3, for example, a pair of cores 10 and 11 which have been joined in advance are adhered and fixed to the tip end portion of a head base 34 made of brass, for example, by a known ultraviolet curable resin.

Next, FIG. 2 (further, FIG. 4 which is a main part thereof)
As shown in, the cores 10 and 11 are not attached to the jig 30 on the support base 32, and the support base 32
Fix on top. At this time, the gap d is set to 0.06 mm or less.

Next, the cores 10 and 11 are wound through the winding holes 18, and at this time, the winding material having an outer diameter of 0.06 mm is restricted in position by the jig 30 at the tip end portion 31a,
There is no displacement from the gap d to the tip side.

Therefore, the winding material does not come off from the side of the core and sticks out to the medium sliding surface 12, no winding defect occurs, and the manufacturing yield is improved by 3% as compared with the conventional case. Has been confirmed.

This effect is obtained even when the number of turns of the winding material is 10 or more (for example, 10 turns on one side of the core and 20 turns on both sides), or when the core cross-sectional area of the winding part is 0.06 mm ² or more. But you can definitely get it.

After the winding is performed in this way, the windings 15 and 16 are completely made of UV curable resin 37 in the state shown in FIG. 5 so as to prevent the winding material from being unintentionally displaced during the subsequent process or setting. Fix it. As shown in FIG. 4, each end of the winding is soldered to a conductive pattern 37 provided on the base 34.

The magnetic head 31 manufactured as described above
6 does not have winding guide grooves (see FIG. 19) as shown in FIG. 6, it is confirmed that the output is improved by 0.5 dB when the core width W2 is made the same as the core width W3 in FIG. There is. The magnetic head 31 is also easy to process.

FIGS. 7 and 8 show a second embodiment in which the present invention is applied to a rotary type magnetic head.

In this example, a rectangular jig 40 is fixed on one upper portion 42a of the supporting base 42 with screws 43, and the other upper portion 42a is fixed.
The tip 31 is arranged on the jig 42b so that the tip 31a of the tip overlaps the jig 40. This tip
31 is glued to the base 34 as described above,
34 is further fixed by screws 35 on the upper portion 42b of the support.

The amount of overlap of the chip 31 with the jig 40 is approximately equal to the amount of protrusion into the recess 36 shown in FIG. Therefore, also in this example, when winding the cores 10 and 11,
The winding material is wound only in a predetermined winding area while the position of the winding material is regulated by the jig 40.
It will be wound well without protruding to the 12 side. The outer diameter of the winding, the number of turns, and the like are the same as in the above example.

In the case of this example, since the jig 40 may be a simple rectangular flat plate, its manufacture becomes easy.

9 and 10 show a third embodiment in which the present invention is applied to a rotary type magnetic head.

In this example, a rectangular jig 50 is fixed on one upper part 52a of the support base 52 with screws 53, and the jig 50 is directly below the jig 50 on the other upper part 52b lower than the upper part 52a. The tip 31 is arranged so that the tip end portion 31a overlaps with the tip 31a. The chip 31 is adhered to the base 34 in the same manner as described above, and the base 34 is further screwed on the support upper portion 52b.
Fixed by.

The amount of overlap of the chip 31 with the jig 50 is substantially equal to the amount of protrusion into the recess 36 shown in FIG. Therefore, also in this example, when winding the cores 10 and 11,
The winding material is wound only in a predetermined winding area while the position of the winding material is regulated by the jig 50.
It will be wound well without protruding to the 12 side. The outer diameter of the winding, the number of turns, and the like are the same as in the above example.

Also in this example, since the jig 50 may be a simple rectangular flat plate, its manufacture becomes easy.

FIG. 11 shows a modification of FIG. 2, which is substantially the same as the jig 30 except that the jig 30 is integrated with the support 32.

That is, the upper portion 32a of the support base 32 itself is used as a jig, and the concave portion 36 is provided in the jig 32 to prevent the protrusion during winding in the same manner as described above. Therefore, in this example, it is not necessary to separately manufacture the jig.

Similar to this example, FIG. 12 is a modification of FIG.
As shown in, the upper portion 42a of the support base 42 can function as a jig so as to regulate the position of the winding from below.

Further, as shown in FIG. 13, as a modification of FIG. 10, the upper portion of the support base 52 is arranged so as to regulate the position of the winding from above.
52a can be used as a jig.

In the head of FIG. 14, since winding grooves 18 are symmetrically provided in both cores 10 and 11, the cross-sectional area of the winding portion of the core 10 is as small as that of the core 11, but In this case also, the effect of the present invention is exhibited.

The head shown in FIG. 15 is a composite head used in combination for one pair, and one of them can be used for noise elimination. Both of them are composed of a joined body of a core 10 having a small cross-sectional area (for example, about 0.06 mm ² or less) and a core 11 having a larger cross-sectional area.

Also in this composite head, the above-mentioned jig for preventing the protrusion can be used when the windings 15 and 16 are applied to the individual chips.

FIG. 16 shows a composite head similar to that of FIG. 15, but both chips are joined by a non-magnetic material 60 such as glass. In this case, the winding 16 is applied in the state of being integrated with the non-magnetic material 60, but it goes without saying that the above-mentioned jig for preventing the protrusion can be used.

Although the present invention has been described with reference to the embodiments, the embodiments described above can be further modified based on the technical idea of the present invention.

For example, the shape and structure of the above-mentioned jig or the like may be variously changed, and the jig fixing method or the head fixing method may be changed.

Of course, the present invention can be applied to various heads other than those described above.

[0046]

As described above, according to the present invention, since the winding is wound by using the jig for preventing the winding from protruding, the winding material is positionally regulated by the jig and is displaced toward the core tip side. There is no such thing. Therefore, the winding material does not come off from the side of the core and sticks out to the sliding surface of the medium, so that no winding defects occur and the manufacturing yield is improved.

Further, since the magnetic head manufactured does not require the winding guide groove, when the core width is the same, the output is improved as compared with the head having the guide groove. Further, the magnetic head is easy to process.

[Brief description of drawings]

FIG. 1 is a plan view of relevant parts showing a situation in which a winding is applied according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the same situation.

FIG. 3 is a perspective view when a head core is bonded to a base.

FIG. 4 is a plan view of relevant parts for explaining the above situation in more detail.

FIG. 5 is a perspective view showing a state in which a winding material is fixed with resin after winding.

FIG. 6 is a plan view of the head after winding.

FIG. 7 is a plan view of relevant parts showing a situation in which a winding is applied according to a second embodiment of the present invention.

FIG. 8 is a side view showing the same situation.

FIG. 9 is a plan view of relevant parts showing a situation in which a winding is applied according to a third embodiment of the present invention.

FIG. 10 is a side view showing the same situation.

FIG. 11 is a perspective view showing a modification example of FIG. 2.

FIG. 12 is a side view showing a modified example of FIG. 8.

FIG. 13 is a side view showing a modified example of FIG.

FIG. 14 is a plan view showing another magnetic head.

FIG. 15 is a plan view showing another magnetic head.

FIG. 16 is a plan view showing still another magnetic head.

FIG. 17 is an exploded view of a fixed magnetic head.

FIG. 18 is a plan view showing a situation in which winding is applied to a rotary magnetic head.

FIG. 19 is a plan view of a magnetic head having a winding guide groove.

[Explanation of symbols]

 1, 21, 31 ・ ・ ・ Magnetic head 10, 11 ・ ・ ・ Core 12 ・ ・ ・ Medium sliding surface 13 ・ ・ ・ Magnetic gap 15, 16 ・ ・ ・ Winding (winding material) 18 ・ ・ ・ Winding hole 30, 40, 50 ... Jigs 32, 42, 52 ... Supports 32a, 32b, 42a, 42b, 52a, 52b ... Upper part 34 ... Head base d ... Gap W1, W2, W3: Core width

Claims (4)

[Claims] 1. A method of manufacturing a magnetic head, wherein, when a winding is applied to a head core, a jig for preventing protrusion of the winding is arranged on the tip side of the head core. 2. The manufacturing method according to claim 1, wherein a rotary magnetic head having no winding guide groove is manufactured. 3. A jig for preventing the winding from protruding, which is fixed on a support base for fixing the base on which the head core is mounted, at the tip side of the head core to which the winding is to be applied. 4. A protrusion for preventing winding protrusion, wherein a part of a support for fixing a base on which a head core to which the winding is to be attached is fixed is used to prevent protrusion of the winding on the tip end side of the head core. Ingredient