JPS58224431A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To improve production yield, by using glass for all bonding ceramic with ferrite both of which constitute a recording/reproducing head and an erasing head, and the recording/reproducing head with the erasing head. CONSTITUTION:Glass is used for all bonding ceramic with ferrite constituting the recording/reproducing head 1, ceramic with ferrite constituting the erasing heads 2, 3 and the recording head 1 with the erasing heads 2, 3. The glass having a lower melting point as compared to the glass used for other bonding parts is used for the bonding of the recording/reproducing head 1 with the erasing heads 2, 3. Consequently, bonding work is simplified and bonding strength can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetic head that operates on a magnetic recording medium such as a floppy disk to reproduce and erase data during recording. llI of a magnetic head having a structure in which an erasing head is disposed
Regarding the manufacturing method.

With the rapid popularity of office computers and personal computers, the demand for floppy disk drive devices has also increased significantly.

In this device, a magnetic head is used to directly write information to and read information from the floppy disk.
Illustrated in the figure. In this FIG. 1, 1 is a recording/reproducing head, and the recording/reproducing gap of head 1 beside 1a1,
1b is a coil. Also, 2 and 3 are recording/playback heads 1
2a and 3a are erase gaps, 4 is a coil for the erase head, and 5 is a core for closing the magnetic circuit on the recording/reproducing head 1 side. still,
The parts represented by dots in the figure are made of ceramic, and the others are made of ferrite. This magnetic head is manufactured by separately making an inner layer recording/reproducing head 1 and outer layer erasing heads 2 and 3, and then stacking them.

By the way, in the conventional manufacturing method, it is difficult to bond the ceramic and ferrite that constitute each part of the recording/reproducing blade 1 and the erasing head 2.3, and to bond the recording/reproducing head 1 and the erasing heads 2 and 3. ■ Adhesives such as boxy resin are used. For this reason, sufficient adhesive strength cannot be obtained,
Manufacturing yield was poor. In particular, in recent years there has been a demand for narrower tracks, and it has become necessary to reduce the thickness of the head, which has become a serious problem. In addition, in the conventional method that includes an adhesion process using boxy resin, etc., after the product is completed, changes in ambient temperature and humidity conditions may cause misalignment between heads 1 to 3, resulting in a decrease in the output of the magnetic head. There were also sexual issues.

The present invention has been made in view of this point, and the bonding between the ceramic and ferrite that constitutes each part of the recording/reproducing head and the erasing head is performed using glass with a relatively high melting point. Regarding adhesion to the erasing head (this method is characterized by forming a glass film with a relatively low melting point on the bonding surface in advance by sputtering, etc., and then welding the glass film part, which makes the manufacturing process easier. This makes it possible to manufacture a magnetic head that is easy to manufacture, has a high manufacturing yield, and has good reliability.

Hereinafter, the method of the present invention will be explained in detail using the drawings.

FIG. 2 is an explanatory diagram showing the manufacturing process of the method of the present invention. In the method of the present invention (well, first, from a ferrite ingot,
The core block is cut out and shaped into a substantially U-shaped cross section (Step 1). Similarly, a second core block is cut out from the ferrite ingot and formed into a substantially single-shaped cross section (Step 3-2).Furthermore, a tummy block made of ceramic with a substantially U-shaped cross section is manufactured (Step 3).Next. Then, the first core block, the second core block, and the dummy block are bonded with glass at the same time (step 4).This glass bonding uses glass with a relatively high melting point. The adhesion between the block and the second core block is done by placing a glass rod in the gap of the joint before placing it in the furnace, without melting it, but the adhesion between the second core block and the dummy block is , before putting it into the furnace, the bonding surface of both parts is sputtered or vacuum evaporated to a thickness of, for example, 1 to several μm.
The reason why a glass thin film is formed and bonded to the latter joint part is because the joint surface between the second core block and the dummy block is wide, so poor adhesion is likely to occur. It is.

Next, the bonded block assembly is subjected to necessary polishing treatment, etc., and then sliced to a predetermined thickness with a non-cut portion of about 0.5 mm (Step 5). Therefore, in this state, each slice portion is not separated. After this step, walk for a predetermined length (step 6). This separates each slice portion. Through the above steps 1 to 6, a recording/reproducing head chip and an erasing head chip are obtained. Furthermore, record/
In the production of playback head chips (well, they are sliced and shaped so that they are thicker and have longer legs than the erase head chips.The recording/playback head chips obtained in this way and the erase head chips are joined together. A glass film is formed on the surface by sputtering or vacuum deposition as in the case described above (step 7).A glass with a relatively low melting point is used for this glass film.Next, both sides of the recording/reproducing head chip are coated. The erasing head chips are stacked on top of the magnetic head and placed in a furnace, where they are glued together. After that, coils are attached, etc., and a magnetic head having the structure as shown in FIG. 1 is completed.

According to the above manufacturing method, the recording/reproducing head 1 shown in FIG.
Adhesion between ceramic and ferrite constituting the erase head 2.3, adhesion between ceramic and ferrite constituting the erase head 2.3,
Furthermore, since the recording/reproducing head 1 and the erasing heads 2 and 3 are bonded together by glass bonding, the bonding strength is improved. Also, a recording/reproducing head 1 and an erasing head 2.
3 is bonded with glass that has a lower melting point than the other bonded parts, so the previous bonded part (the part glued in the block state) will not come off during this bonding process. Furthermore, since a glass film is previously formed on the wide-area bonding surface by sputtering or the like, and bonding is performed by melting this glass film, no bonding defects occur.

Therefore, manufacturing yield is good. On the other hand, even after the product is completed, it is resistant to changes in ambient temperature and humidity conditions, and there is no misalignment between the recording/reproducing head 1 and the erasing heads 2 and 3, and no decrease in the output of the magnetic head occurs.

In the above description, when a glass film is formed on the bonding surfaces by sputtering or the like, a glass film is formed on both opposing bonding surfaces, but it is also possible to form the glass film on only one side.

However, in this case, it is necessary to increase the thickness of the glass film.

As explained above, according to the method of the present invention, it is possible to manufacture a magnetic head that is easy to manufacture, has a good manufacturing yield, and is highly reliable.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head manufactured by the method of the present invention, etc., and FIG. 2 is an explanatory diagram showing the manufacturing process of the method of the present invention. 1... Recording/reproducing head 2, 3... Erasing Head 4.
1b...Coil 1a...Recording/reproducing gap 2a, 3a...Erasing gap 5...Core patent applicant Foster Technology Co., Ltd.

Claims (1)

[Claims] In a method of manufacturing a magnetic head having a configuration in which erasing heads are disposed on both sides of a recording/reproducing head, a first core block having a substantially 1-shaped cross section, a second core block having a substantially 1-shaped cross section, and a dummy member. A first step is to adhere a dummy block to form a dummy block using glass with a relatively high melting point, and the combined body of blocks obtained in the first step is sliced and cut into a predetermined shape. A second step of obtaining a recording/reproducing head chip and an erasing head chip, and a comparison by sputtering or the like on at least one side of the bonding surface of the recording/reproducing head chip and the erasing head chip 1q obtained in the second step. a third step of forming a glass film with a relatively low melting point; and a fourth step of stacking an erasing head chip on both sides of a recording/reproducing head chip and bonding them by heating. Head manufacturing method.