JPH01217710A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To have large space for a coil winding by fitting a cutoff plate for a supplement having a shape to be fitted into the notch part of another cutoff plate into the notch part after a joining process and fixing the cutoff plate. CONSTITUTION:Cutoff plates 1 and 1' are formed into shapes having notch parts 1a and 1a' obtained by notching the inside parts of back edge parts to be the neighborhoods of coil bobbins 4 from outside shapes to shield the whole of core half bodies 2 and 2'. Hereupon, since the cutoff plates 1 and 1' have the notch parts 1 and 1a', and the deterioration of their flux cutoff effects cannot be prevented only with the cutoff plates 1 and 1', a cutoff plate 6 for the supplement is used. The cutoff plate 6 is formed into the shape to be exactly fitted into the continuous notch parts 1a and 1a', namely the shape to correspond to a joined notch part obtained by joining the notch parts 1a and 1a', when the cutoff plates 1 and 1' are joined. Thus, the coil bobbins 4 never touch on the cutoff plates, and the large space for the coil winding can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a magnetic head, and in particular to a method for manufacturing a magnetic head, in which a magnetic core fitted with a coil bobbin is slid onto a magnetic recording medium to magnetically record or reproduce information. The present invention relates to a method of manufacturing a magnetic head in which a plurality of channels of magnetic cores are arranged in parallel in the track width direction and a shielding plate for magnetic shielding is provided between each magnetic core.

[Conventional technology]

3(A) and 3(B) illustrate the conventional manufacturing method of this type of magnetic head, and illustrate the assembly process of the magnetic core, coil bobbin, and shielding plate in the manufacturing process of the magnetic head. be.

In both figures, reference numeral 2.2' denotes a magnetic core half (hereinafter abbreviated as core half) constituting the magnetic core, which is formed from a high permeability magnetic material into a bent shape as shown.

Further, reference numerals 3 and 3' designate supports that respectively support the core half body 2.2' and the later-described shielding plate 7.7'. Reference numeral 4 designates a coil bobbin, around which a coil winding 4a is wound, and as shown in FIG. 5, a hole 4b for fitting the coil bobbin 4 is formed in the core half 2.2'. Reference numeral 5 denotes a shim made of a non-magnetic material and serving as a spacer constituting a magnetic gap of the magnetic core.

Further, reference numerals 7 and 7' indicate shielding plates for performing magnetic shielding between the magnetic cores mentioned above. The blocking plate 7゜7' is formed in the shape as shown in Fig. 4, and includes the inner area of each recess 2a, 2a' of the core half 2.2' in Fig. 3(A). The core halves 2 and 2' are each formed in a shape that completely shields them. The cross-sectional structure of the blocking plate 7.7' is shown in FIG. 5, and has a three-layer structure in which non-magnetic spacing plates 8.8 are laminated on both sides of the magnetic plate 9.

In the assembly process of each of these parts, support 3 is first used.
In contrast, the core halves 2 and the blocking plates 7 are arranged and fixed alternately at predetermined intervals in the track width direction of the core halves 2, as shown in FIG. 3(B). Similarly, the core half 2' and the blocking plate 7' are fixed to the support 3'.

Next, the coil bobbin 4 is fitted to the rear end of the core half 2.2' (lower end in FIG. 3(A)), and the shim 5 is sandwiched between the tips of the core half 2.2'. Assembly of core half 2, support 3, blocking plate 7, core half 2', support 3'
, and the assembly of the blocking plate 7' are butted against each other as shown by arrow A in FIG. 3(B) and joined. A magnetic core is constituted by the joined pair of core halves 2.2', and a magnetic gap is formed in this magnetic core by the shim 5.

And thus obtained multi-channel magnetic core, support 3.3', coil bobbin 4 and blocking plate 7.7
A magnetic head is constructed by fitting and fixing the assembly into a case of a magnetic head (not shown).

[Problems to be Solved by the Invention] However, according to the conventional magnetic head manufacturing method as described above, if the number of turns of the coil winding 4a is increased due to the design of the magnetic head, or the coil winding 4a may be disconnected. When the diameter of the coil winding 4a is increased to prevent the above-mentioned 2.
When the two assemblies are butted together, the coil bobbin 4 comes into contact with the blocking plate 7, 7', making it impossible to match them together. Also, the blocking plates 7, 7. There is also the problem that it becomes difficult to downsize the entire magnetic head in order to secure space for the coil winding 4a by avoiding contact with the magnetic head.

Therefore, as a countermeasure to this problem, the structure of the shielding plate 7.7' is such that the rear end side near the coil bobbin 4 is not provided with a non-magnetic spacer plate 8.8, but has a magnetic structure as shown in FIG. A single layer structure consisting of only the plate 9 is adopted. Fifth
As is clear from the comparison between the figure and FIG. 6, the blocking plate 7 in FIG.
It can be seen that there is more space for installing the coil bobbin 4 when the coil bobbin 4 is used.

However, even when the shielding plate shown in FIG. 6 is used, the coil bobbin may not come into contact with the shielding plate at the time of butting due to misalignment in the assembly of the shielding plate or the core halves.

Therefore, an object of the present invention is to prevent the coil bobbin from hitting the shielding plate when the core halves and the shielding plate assemblies are butted together in the manufacturing method of the above-mentioned type of magnetic head, and to prevent the coil bobbin from hitting the shielding plate. The object of the present invention is to provide a manufacturing method that can take up a large amount of space.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, two sets of magnetic core halves and magnetic shield blocking plates are arranged and supported alternately in the track width direction by support members. In the method for manufacturing a magnetic head, the method includes a step of fitting a coil bobbin to each magnetic core half and butt-joining the coil bobbin, using a cutout area of the coil bobbin as the shielding plate, and after the joining step. A configuration is adopted that includes a step of fitting and fixing a supplementary blocking plate having a shape to compensate for the notch of the blocking plate into the notch.

[Function] According to the above configuration, since the shielding plate that is first butted together with the magnetic core halves is cut out in the region near the coil bobbin, the coil bobbin does not hit the shielding plate when they are butted together. In addition, the corners of the coil windings wound around the coil bobbin are rounded, so when the supplementary shield plate is passed between the coil bobbins and fitted into the notch of the main shield plate after the butt joining process, it will not get caught and will not get caught. It can be inserted and mated. Also, even if there is a slight deviation in the assembly position of the main shield plate or core half, the supplementary shield plate can be inserted and assembled as long as there is a gap between the coil bobbins that corresponds to the thickness of the supplementary shield plate. .

[Example] DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the present invention will be described below with reference to the drawings.

1(A), (B) and FIG. 2 illustrate an embodiment of the method for manufacturing a magnetic head according to the present invention, and FIG.
Figures (A) and (B) show the assembling process of the assembly consisting of the core half, coil bobbin, shielding plate and support described above in the manufacturing process of a magnetic head, and FIG. 2 shows the structure of the shielding plate. In these drawings, the same reference numerals are given to the same members as those in FIGS. 3(A) and 3(B) and the subsequent drawings explaining the conventional method, and the explanation thereof will be omitted.

Conventional shielding plates were constructed as a set of two sheets, but in this embodiment, as shown in FIG. 1(A) and FIG. .1' and 6 shall be used.

First, the shielding plate indicated by the reference numeral 1.1' is the main shielding plate, and is a notch cut out from the inner part of the rear end near the coil bobbin 4 from the outer shape to shield the entire core half 2.2'. It is formed in a shape having portions 1a and 1a'. The cross-sectional structure of the shielding plates 1 and 1' may be the structure shown in FIG. 5 mentioned above, and may have a three-layer structure in which non-magnetic spacer plates 8 and 8 are laminated on both sides of the magnetic plate 9, or the structure shown in FIG. The structure may be such that only the magnetic plate 9 is provided on the rear end side of the coil bobbin 4 side.

By the way, the blocking plate 1.1' has a cutout portion 1a.

la', the magnetic flux blocking effect deteriorates if only the blocking plate 1.1' is used. To compensate for this, a supplementary blocking plate 6 is used. The blocking plate 6 is the blocking plate 1.1'
Continuous notches 1a, la' when butted against each other
The shape that exactly compensates for, that is, the notch parts 1a, l
The shape and dimensions correspond to the sum of a'. Further, the cross-sectional structure of the blocking plate 6 is preferably a single-layer structure consisting only of magnetic plates.

In addition, the core half 2.2' other than the shielding plate 1.1' and 6,
The support 3, 3', coil bobbin 4 and shim 5 are the same as those of the conventional example described above.

Next, the assembly process of the assembly of each member shown in FIG. 1(A) in this embodiment will be explained.

In the assembly process, first, the blocking plates 1 and the core halves 2 are arranged and fixed to the support 3 alternately at predetermined intervals in the track width direction of the core halves 2, as shown in FIG. 1(B). Further, the blocking plate 1' and the core half body 2' are similarly fixed to the support 3'.

Next, a coil bobbin 4 is fitted to the rear end of each of the core halves 2 and 2', and a shim is inserted between the tip ends of the core halves 2 and 2'.
Insert the shield plate 1, core half 2, support 3
The assembly and the assembly of the blocking plate 1', the core half 2', and the support 3' are butt-jointed as shown by arrow A in FIG. 1(B).

Next, after applying adhesive to the peripheral edge of the supplementary shielding plate 6, the shielding plate 6 is inserted between the adjacent coil bobbins 4 as shown by arrow B in FIG. 1(A), and the shielding plate 1.1 is inserted.
' Notch part 1a.

It fits into la' and is fixed by adhesive. The notches 1a, la' of the shields [1, 1' are filled with the shield plate 6,
The lack of magnetic flux blocking effect of the blocking plate 1.1' is compensated for.

The thus obtained assembly is then fitted and fixed into the case of a magnetic head (not shown) to form a magnetic head.

According to this embodiment, the coil bobbin 4 does not come into contact with the shielding plate 1.1' because the shielding plate 1.1' has the notches 1a and la' at the time of the above-mentioned butting.
Also, insert the supplementary shielding plate 6 between the coil bobbins 4 from behind and cut out the cutouts 1a, la' of the shielding plate 1.1'.
Since the corners of the coil winding 4a of the coil bobbin 4 are rounded, the shielding plate 6 can be inserted smoothly without getting caught. In addition, the shield plate 1.1' or the core half 2゜2' sabot)
Even if the assembly position relative to -3 and 3' is slightly shifted, the shielding plate 6 can be inserted and assembled as long as there is a gap between the coil bobbins 4 according to the thickness of the shielding plate 6.

Therefore, according to this embodiment, the winding space for the coil winding 4a can be made larger than in the conventional case, and the winding diameter of the coil winding 4a can be increased. Therefore, the sensitivity of the magnetic head can be improved by increasing the number of turns of the coil winding 4a. Alternatively, you can use thicker coil windings without changing the number of turns to prevent disconnection of the coil windings.
The reliability of the magnetic head can be improved.

Furthermore, according to this embodiment, more space can be secured for the coil winding than in the past, and by saving this space, the magnetic head can be made smaller.

[Effects of the Invention] As is clear from the above description, according to the present invention, two sets of a plurality of magnetic core halves and magnetic shield blocking plates arranged and supported alternately in the track width direction by supporting members are connected to each magnetic core. In a method for manufacturing a magnetic head that includes a step of fitting a coil bobbin to a core half and butt-joining the core halves, the shielding plate is formed by cutting out a region near the coil bobbin, and after the joining step, the shielding plate is Since we have adopted a configuration that includes a step of fitting and fixing a supplementary blocking plate shaped to compensate for the notch into the notch, it is possible to take up a larger space for coil winding than before, and the coil winding This provides excellent effects such as increasing the number of turns of the wire to improve the sensitivity of the magnetic head, increasing the thickness of the coil winding to prevent wire breakage and improving reliability, and making the magnetic head more compact. It will be done.

[Brief explanation of the drawing]

FIGS. 1(A) and 1(B) show an embodiment of the method for manufacturing a magnetic head according to the present invention, and are a top view and a rear view illustrating the assembly process of an assembly consisting of a core half, a shield plate, a coil bobbin, and a support, respectively. Fig. 2 is Fig. 1 (A), (
B) A top view showing the shape of the blocking plate in FIG. 3(A), (
B) is a top view and rear view explaining the assembly process by the conventional method, FIG. 4 is a top view showing the shape of the blocking plate in FIGS. 3(A) and (B), and FIGS. 5 and 6. 2A and 2B are cross-sectional views of different conventional blocking plates and coil bobbins, respectively. 1.1'...Break plate 2.2'...Core half 3.
3'...Support 4...Coil bobbin 4a...
Coil winding 5... Shim 6... Supplementary shielding plate Fig. 1 (B) 41-1 Vessel' right side Fig. 4

Claims (1)

[Claims] 1) A magnetic device comprising the step of butt-joining two sets of a plurality of magnetic core halves and magnetic shield shielding plates arranged and supported alternately in the track width direction by supporting members by fitting a coil bobbin to each magnetic core half. In the head manufacturing method, the shielding plate is formed by cutting out a region near the coil bobbin, and after the bonding step, a supplementary shielding plate having a shape to compensate for the notch of the shielding plate is inserted into the notch. 1. A method of manufacturing a magnetic head, comprising the step of fitting and fixing the head.