JPH04251409A - Production of magnetic core - Google Patents

Abstract

PURPOSE:To allow multi-piece production of front cores from the block of a core blank material in the process for producing the magnetic core of the structure which consists of the front core and the back core, which front core being constituted of a core for writing, a core for reading narrower in track width than this core, and two dummy cores, and in which the dummy cores are joined to the core for writing together with the core for reading via a magnetic gap on both sides of the core for reading. CONSTITUTION:Plural pieces of 1st members to be used as the blank material for the cores for writing and 2nd members corresponding to the joined body of the cores for reading and the dummy cores are formed by jointing the block of the 1st core blank material formed with plural projecting parts corresponding to the dummy cores at prescribed intervals in a comb shape and the block of the 2nd core blank material formed with plural projecting parts corresponding to the cores for reading at prescribed intervals in the comb shape and cutting the joined body thereof. The cores for writing obtd. by working the above- mentioned 1st member and the above-mentioned 2nd member are joined to obtain the front cores.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic core for a magnetic head that magnetically records and reproduces information by bringing the magnetic core into sliding contact with a magnetic recording medium such as a magnetic card or magnetic tape. It is.

0002

[Prior Art] The magnetic core of a magnetic head employs a structure called a clevite type, in which a front part that makes sliding contact with a magnetic recording medium and a rear part on the opposite side are formed separately as a front core and a back core and are joined together. There are cases. According to this structure, it is possible to manufacture the front core and back core from materials suitable for each.Usually, the front core is made of sendust or ferrite, considering wear resistance, and the back core is made of materials such as sendust or ferrite, due to cost and magnetism. In many cases, a laminated structure of permalloy is used in consideration of its characteristics.

[0003] In such a clevite-type magnetic core, which has a simple structure in which the front core is constructed by joining two cores through a magnetic gap, the track width is adjusted in the manufacturing process by sandwiching a shim that forms the magnetic gap. After butting together long blocks of core material and gluing them together,
It is possible to produce a large number of front cores by cutting them to the required track width, thereby reducing costs.

0004

[Problems to be Solved by the Invention] On the other hand, in recent years, as a magnetic head for a magnetic card reader/writer that magnetically records and reproduces information on a magnetic card, a single magnetic head is used to record and reproduce information. R/W (read/write) combination heads have been developed that perform so-called wide writes and narrow reads in which the track width for recording is wider than the track width for reproduction.

When trying to manufacture a front core using this head with a clevite-type magnetic core, the front core has a write core 1 and a read core 2 as shown in FIG.
Since the structure is complicated and consists of two dummy cores 3, 3, it is not possible to produce a large number of front cores using conventional manufacturing methods, and the front cores are assembled one by one. Therefore, there was a problem in that the manufacturing cost was high, and there was no advantage of reducing costs by using a clevite type.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to manufacture the magnetic core of this type of magnetic head by making it possible to manufacture a large number of front cores, thereby reducing costs.

[0007]

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, in a method for manufacturing a magnetic core of the type described above, a protrusion corresponding to a dummy core is combed into a block of a first core material. forming a plurality of protrusions corresponding to lead cores on a second core material block at predetermined intervals; and forming a plurality of protrusions corresponding to lead cores in a comb shape at predetermined intervals on a second core material block; The groove between the protrusions of the second
a step of inserting the protruding part of the block to join both blocks, and cutting the joined body of both blocks to obtain a first member that becomes a material for the write core, and a joined body of the read core and the dummy core. and a step of obtaining a front core by joining the light core obtained by processing the first member and the second member. .

[0008]

[Operation] According to such a configuration, in the step of cutting the joined body of the first and second blocks, the first member, which is the material of the write core, and the joined body of the read core and the dummy core are cut. A large number of second members can be obtained at one time, and the manufacturing process can be simplified.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment FIGS. 1 to 4 show the R/W described above as the first embodiment of the present invention.
This is a description of the manufacturing process of a front core that constitutes a clevite-type magnetic core of a combination head.

First, before starting the manufacturing process, the structure of the completed front core shown in FIG. 4 will be explained.

In FIG. 4, reference numeral 1 indicates a write (recording) core with a large track width, and numeral 2 indicates a read (reproduction) core with a small track width. The overall shape of the lead core 2 is shown in FIG. Further, in FIG. 4, reference numeral 3 denotes a dummy core, which compensates for the difference in track width between the write core 1 and the read core 2.

A non-magnetic layer (for welding or adhesion and magnetic insulation) is provided on both sides of the lead core 2 so as to sandwich it therebetween.
Dummy core 3 via fused glass or adhesive) 4,
3 are joined, and then lead core 2 and dummy cores 3, 3 are joined.
is connected to the write core 1 via a magnetic gap 5 to constitute a front core.

Next, the manufacturing process of the front core will be explained.

In FIG. 1, reference numeral 11 denotes a block made of a high permeability magnetic material as a core material from which a plurality of write cores 1 and dummy cores 3 (four and eight in this case) are cut out. Further, reference numeral 12 indicates a plurality of lead cores 2 (in this case, 4
It is a block made of a high permeability magnetic material, which is the core material from which the core material is cut out.

In the manufacturing process of the front core, first, grooves 11a having a width slightly larger than the lead core 2 are formed at predetermined intervals on one side of the block 11 so that the rectangular block 11 has a comb shape as a whole. . Projections 11b are formed on both sides of the groove 11a, and these become portions corresponding to the dummy core 3. The block 12 is also formed in a comb shape, and protrusions 12a corresponding to the lead cores 2 are formed at intervals corresponding to the grooves 11a.

Then, as shown in FIG. 1, the protrusions 12a of the blocks 12 are inserted into the grooves 11a of the blocks 11, and the blocks 11, 12 are bonded by glass welding or bonding via the non-magnetic layer (welded glass or adhesive) 4. join.

Next, the joined body of blocks 11 and 12 is cut along cutting lines a and b in the figure to obtain a plurality of members (four in this case) as shown in FIG. In this member block 12
The protrusion 12a is cut to form the lead core 2. The shapes of the lead core 2 and the cut members on the block 11 side are shown in FIG. In the cut member on the block 11 side, a portion 11c is a portion that will become the material of the light core 1.

Next, the member shown in FIG. 3 is cut along cutting line c. By this cutting, the protruding portion 11b becomes the dummy core 3, and the portion to the left of the cutting line C of the member in FIG. 3 becomes a joined body of the lead core 2 and the dummy cores 3, 3.

Next, the diagonally shaded portion of the member 11c obtained by the cutting is ground to obtain the light core 1. After polishing the mating surfaces of the joined body of the read core 2 and dummy core 3 and the write core 1, the two are butted together through the magnetic gap 5 as shown in Figure 4, and joined by glass welding or adhesive to complete the front core. . The front core and the back core (not shown) constitute a magnetic core of the R/W combination head.

According to this embodiment as described above, by cutting the joined body of the blocks 11 and 12 shown in FIG. You can obtain many parts at once,
The manufacturing process of the front core can be significantly simplified compared to conventional methods.
The cost of the front core can be reduced.

Second Embodiment Next, FIG. 5 illustrates a method for manufacturing a front core according to a second embodiment of the present invention.

In FIG. 5, the reference numeral 13 is a block 11 made of the material of the write core 1 and dummy core 3, which is twice the height, that is, two blocks 11, and corresponds to the groove 11a. Grooves 13a are formed at predetermined intervals, and protrusions 13b on both sides of the grooves 13a correspond to the dummy core 3.

Further, reference numeral 14 is a block corresponding to a combination of four blocks 12 made of the material of the lead core 2 described above, and protrusions 14a corresponding to the lead core 2 are formed on the top and bottom of both sides. .

In the manufacturing process of this embodiment, block 13,
After forming 14, two blocks 1 are formed as shown in FIG.
3 on both the left and right sides of block 14, and block 1
4 are inserted into the grooves 13a of the blocks 13 on both sides, and the blocks 13, 13 are attached to both sides of the block 14 by glass welding or adhesion via the non-magnetic layer (welded glass or adhesive) 4. Join.

Next, by cutting the joined body of blocks 13, 13, and 14 along cutting lines d and e in the figure, the structure shown in FIG.
Obtain four pieces that are the same as the joined bodies of blocks 11 and 12. Hereinafter, a front core is manufactured using the same steps as in the first example.

According to this embodiment, block 1
From the joined body of 3, 13, and 14, it is possible to produce four times as many front cores as in the first embodiment.

[0028]

As is clear from the above description, the present invention comprises a front core and a back core, the front core being a write core, a read core having a narrower track width than the core, and two cores. Consists of a dummy core,
In a method for manufacturing a magnetic core in which a dummy core is joined to a write core together with a read core through a magnetic gap, a protrusion corresponding to the dummy core is formed in a comb shape on a first core material block. forming a plurality of protrusions at predetermined intervals at predetermined intervals; forming a plurality of protrusions corresponding to the lead cores in a comb shape at predetermined intervals on a block of the second core material; A step of inserting the protrusion of the second block into the groove between the protrusions to join both blocks, and cutting the joined body of the two blocks to form a first member that will become the material of the light core. , a step of obtaining a plurality of second members each corresponding to a joined body of the lead core and the dummy core; and a step of joining the write core obtained by processing the first member and the second member to form a front. A configuration including a process for obtaining a core was adopted.

According to this configuration, in the step of cutting the joined body of the first and second blocks, the first member which is the material of the write core and the first member which is the joined body of the read core and the dummy core are cut. A large number of the members No. 2 can be obtained at one time, and the manufacturing process can be greatly simplified and costs can be reduced, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a state in which blocks of core material are joined together in the manufacturing process of a front core of a magnetic core according to a first embodiment of the present invention.

2 is a perspective view showing the shapes of the lead core and the remaining portion of the member obtained by cutting the joined body of the blocks shown in FIG. 1, separated from each other; FIG.

FIG. 3 is a perspective view of a member obtained by cutting the joined body of blocks in FIG. 1;

FIG. 4 is a perspective view of the completed front core.

FIG. 5 is a perspective view of a state in which blocks of core material are joined together in the manufacturing process of the front core of the magnetic core according to the second embodiment.

[Explanation of symbols]

1 Light core 2 Lead core 3 Dummy core 4 Non-magnetic layer 5 Magnetic gap 11 Core material block 12 Core material block

Claims (1)

[Claims] [Claim 1] Consisting of a front core and a back core,
The front core includes a write core, a read core having a narrower track width than the core, and two dummy cores, and the dummy core is joined to the write core through a magnetic gap with the core across the read core. The method for manufacturing a magnetic core includes the steps of: forming a plurality of protrusions corresponding to the dummy core in a comb shape at predetermined intervals on a block of a first core material; and forming a plurality of protrusions corresponding to the lead core on a block of a second core material. forming a plurality of comb-shaped protrusions at predetermined intervals, and after both steps, inserting the protrusion of the second block into the groove between the protrusions of the first block to join both blocks. and a step of cutting the joined body of both blocks to obtain a plurality of first members serving as the material of the write core and a plurality of second members corresponding to the joined body of the read core and the dummy core. and a step of joining a write core obtained by processing the first member and the second member to obtain a front core.