JPH043004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a bulkhead used in a magnetic recording device such as an FDD (floppy disk drive).

BACKGROUND OF THE INVENTION This type of bulkhead generally has a structure as shown in the plan view of FIG. That is, this bulkhead has a read/write core 1 (hereinafter referred to as R/W core) for writing and reading information and an erase core 2 (hereinafter referred to as E core) for erasing information, and a central glass etc. R/W core 1
has a structure in which a material A 4 and a material B 5 made of ferrite are joined to each other by a bonding material 7 such as glass molded into a track groove 6, and an E core 2
Also has a similar structure in which material A 8 and material B 9 made of ferrite are bonded to each other by a bonding material 11 such as glass molded into a track groove 10.

In a bulkhead with such a structure, in order to write, read, and erase information accurately, the center line L of the track width of the R/W core 1 and E
It is necessary to suppress the deviation (hereinafter referred to as center deviation) of the center track groove 10, which defines the guard band width of the core 2, from the center line l to about 3 μm or less.

Incidentally, the above-mentioned bulkhead has conventionally been manufactured by a so-called two-stage welding method as shown in FIG.

That is, as shown in FIG. 3A, a large number of track grooves 6 are formed in the A material block 12 and B material block 13 for the R/W core, and a bonding material such as glass is molded, and as shown in FIG. As shown, both block 1
By heating the bonding material 7 above the melting point of the bonding material while the track groove forming surfaces 2 and 13 are in contact with each other and welding the bonding material 7 in the track groove 6, a block-shaped R/W is formed.
Core 1 is formed.

On the other hand, as shown in FIG. 3C, a large number of track grooves 10 are formed in the A material block 15 and the B material block 16 for the E core, and a bonding material such as glass is molded, and as shown in FIG. 3D. Then, both block 1
A block-shaped E
Core 2 is formed.

Next, as shown in FIG. 3E, the R/W core 1
In the recess 18 formed on the joint surface of either the A material block 12 of the E core 2 or the A material block 15 of the E core 2,
A bonding material 3 such as glass having a melting point lower than that of the bonding material in the track grooves 6 and 10 is molded, and the melting point of the bonding material 3 is melted or higher with both A material blocks 12 and 15 in contact with each other as shown in the figure. R/W by heating and welding
Core 1 and E-core 2 are joined and integrated. Thereafter, it is sliced along the cutting line to obtain chip-shaped bulkhead cores.

Problems to be Solved by the Invention However, in such a two-stage welding method, a block-shaped R/W core 1 and a block-shaped E core 2 are
When joining, it is not easy to align the center line L of the track width of the R/W core 1 and the center line L of the track groove 10 that defines the guard band width of the E core 2, so that There was a problem in that a considerable error occurred and it was difficult to suppress the above-mentioned center deviation to within 3 μm.

Means for Solving the Problems In order to solve the above problems, the present invention provides a bulkhead manufacturing method that uses a single dual-purpose A material block that serves as an A material block for read/write cores and an A material block for erase cores. A read/write core forming process in which a B material block for read/write cores is joined to one side of the block to form a read/write core, and a B material block for erase cores is attached to the opposite side of the above-mentioned dual-purpose A material block. The erase core forming process involves joining to form an erase core, and forming a deep groove approximately in the center of the dual-purpose A material block, molding a bonding material into this deep groove, and forming an A material block for the read/write core and an A material block for the erase core. The gist is that the structure includes a step of sorting into blocks of material.

Example Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is an explanatory diagram of one embodiment of the bulkhead manufacturing method according to the present invention, and according to this,
In the first R/W core forming process, a single dual-purpose A material block 19 made of ferrite, which also serves as an A material block for the R/W core and an A material block for the E core, as shown in Fig. 1A, is used. A large number of track grooves 6 of a predetermined width are formed on one side of this dual-purpose A material block 19 at predetermined track widths using a dicer or the like. Correspondingly, a large number of track grooves 6 are also formed on the joint surface of the B material block 13 for the R/W core, and each track groove 6 of these blocks 19, 13 is formed.
A bonding material such as glass is molded onto the surface. in this case,
The surface of the molded bonding material will swell slightly, so
It is preferable to polish it to make it flat.

Next, as shown in FIG. By fusing the bonding material 7 made of glass or the like, the dual-purpose A material block 19 and the B material block 13 are joined and integrated to form a block-shaped R/W core 1.

When the formation of the R/W core 1 is completed as described above, in the next E core formation process, as shown in FIG. First, a large number of track grooves 10 having a predetermined width are formed at a predetermined E track width. In that case, the track groove 10 should be formed so that the deviation between the center line L of the track width of the R/W core 1 and the center line L of the track groove 10 that defines the guard band width of the E core is 3 μm or less. However, since this track groove 10 is precisely cut and formed on the side surface of the A-material block 19 that has been assembled into a joined body using a dicer or the like as in the case described above,
The center deviation rarely exceeds 3 μm. Corresponding to the track groove 10 on the opposite side of this dual-purpose A material block 19, a B material block 16 for the E core is installed.
A large number of track grooves 10 are also formed on the bonding surfaces of the blocks 19 and 16, and a bonding material is molded into each of the track grooves 10 of the blocks 19 and 16. In this case, as the bonding material, glass or the like having a lower melting point than the bonding material 7 used for forming the R/W core is used.

Next, as shown in FIG. 1D, the track groove forming surfaces of the dual-purpose A material block 19 and B material block 16 are brought into contact with each other so that the melting point is higher than the melting point of the bonding material 11 in the track groove 10 and of the bonding material 7. By heating at a lower temperature and welding the bonding material 11 in the track groove 10, the dual-purpose A material blocks 19 and B
The material blocks 16 are joined and integrated to form a block E.
Core 2 is formed. If heating and welding are performed in such a temperature range, the bonding material 7 in the track groove 6 of the R/W core 1 will not soften or melt, so that the joint material 7 of the dual-purpose A material block 19 and the B material block 13 for the R/W core can be bonded. There is no risk of misalignment in the bonding positional relationship.

As described above, the R/W core 1 and E core 2 are formed on both sides of the dual-purpose A material block 19. In the next dividing process, the dual-purpose A material block 19 is used as the dual-purpose A material block 19, as shown in FIG. A deep groove 22 is formed approximately in the center of the material block 19 using a slicer or the like.
By molding the non-magnetic bonding material 3 on
The dual-purpose A material block 19 is magnetically divided into an A material block 12 for the R/W core and an A material block 15 for the E core. The non-magnetic bonding material 3 used may be a glass with a high melting point used as the bonding material 7, a glass with a low melting point used as the bonding material 11, or a glass other than these.

After dividing the dual-purpose A material block 19 in this manner, the remaining bottom portion 23 of the deep groove 22 of the dual-purpose A material block 19 is cut out along the cutting line shown by the dashed line in FIG. Separated A material block 12 for R/W core and A material block 12 for E core
The material blocks 15 are separated from each other while being joined through the joining material 3, and finally sliced along the cutting line to obtain the desired chip-shaped bulkhead core.

In this embodiment, the dividing process of the dual-purpose A material block 19 was performed independently after the forming process of the E core 2, but this dividing process was carried out independently from the forming process of the R/W core 1 and the
It may be carried out between the steps of forming the core 2,
Further, it can be included in the molding process of the R/W core 1 or the molding process of the E core 2.

When performing a dividing process between the R/W core 1 forming process and the E core 2 forming process, the R/W core 1 is placed on one side of the dual-purpose A material block 19 as shown in FIG.
After forming, a deep groove 22 is formed approximately in the center of the dual-purpose A material block 19, and the bonding material 3 is molded. In order to prevent this, it is necessary to use glass or the like having a high melting point as the bonding material 7.

Furthermore, when a dividing process is incorporated into the forming process of the R/W core 1, the deep grooves 22 are formed when forming the track grooves 6 on one side of the dual-purpose A material block 19, and the bonding material 7 is applied to the track grooves 6. When molding, the bonding material 3 may also be molded into the deep groove 22, but
In this case as well, it is necessary to use glass or the like with a high melting point as the bonding material 3.

On the other hand, when a dividing process is incorporated into the forming process of the E core 2, as shown in FIG. Track groove 10
When molding the bonding material 11, the bonding material 3 may also be molded in the deep groove 22, but in this case, the bonding material 3 may be glass with a high melting point like the bonding material 7 or a low melting point like the bonding material 11. Any of these glasses can be used.

Effects of the Invention As can be understood from the above explanation, the manufacturing method of the present invention is based on an idea that is completely opposite to the conventional two-step welding method in which the R/W core and E core are formed separately and then joined together. By using a dual-purpose A material block for the R/W core and the A material block for the E core by later forming deep grooves in the dual-purpose A material block and molding the bonding material. Since the blocks are divided into two, both blocks of A material are in a fixed relationship until the end, and no relative positional deviation occurs. Therefore, the more precisely the track grooves on one side of the dual-purpose A material block and the track grooves on the opposite side are formed so that they have an appropriate relative positional relationship, the less center deviation will occur, and precision cutting will be possible. By forming the track grooves using a suitable dicer or the like, it is possible to easily suppress center deviation to, for example, 3 μm or less.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a core block showing an embodiment of the manufacturing method of the present invention, FIG. 2 is a plan view of a bulkhead, and FIG. 3 is a perspective view or a plan view of a core block showing a conventional method. 1...R/W core, 2...E core, 3,7,1
1... Bonding material, 6, 10... Track groove, 12...
...A material block for R/W core, 13...R/W
B material block for core, 15...A material block for E core, 16...B material block for E core, 1
9...Dual use A material block, 22...Deep groove.

Claims (1)

[Scope of Claims] 1. A single dual-purpose A that serves as an A material block for read/write cores and an A material block for erase cores.
B for read/write core on one side of the material block
a read/write core forming step in which a read/write core is formed by joining material blocks; an erase core forming step in which a B material block for an erase core is joined to the opposite side of the dual-purpose A material block to form an erase core; A deep groove is formed approximately in the center of the dual-purpose A block, and a bonding material is molded into this deep groove to form a lead.
1. A method for manufacturing a bulkhead, comprising a step of dividing into A material blocks for light cores and A material blocks for erase cores. 2. The manufacturing method according to claim 1, wherein a dividing step is performed after the erase core forming step. 3. The manufacturing method according to claim 1, characterized in that a dividing step is provided between the read/write core forming step and the erase core forming step.