JPS6242308A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head having excellent wear resistance by interposing a Pb glass bonding agent prepd. by forming PbO-SiO2-B2O3-Al2O3 glass to a specific compsn. between the joint surfaces of an element part and melting the bonding agent. CONSTITUTION:Blocks 21, 22 are subjected to glass welding to each other by high melting glass and similarly, blocks 28, 29 are joined to each other. The respective joint surfaces of the 2nd core block 22 and the 3rd core block 28 are polished in such a manner that the respective gaps parallel with each other and thereafter the glass bonding material 40 is interposed between both joint surfaces. The glass bonding material 40 is prepd. by adding CaO, Na2O, and PbF2 to the PbO-SiO2-B2O3-Al2O3 glass to form the compsn. consisting of (69-X)wt% PbO and X(X>=5)wt% PbF2.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) The present invention relates to a method of manufacturing a magnetic head used in a recording device for a magnetic disk, which has reached the end of its industrial application field.

(b) Conventional technology As magnetic disks become smaller and recording density increases, various magnetic heads are used in recording devices that prevent crosstalk from adjacent tracks and enable high-density recording. Proposed. For example, JP-A-57-4
For details, refer to Publication No. 42198.

As shown in FIGS. 5 and 6, the magnetic head i13 consists of two head element parts (21f31). and a second core (5) are joined to each other so that a predetermined recording/reproducing gap (6) is formed between these first cores (4 and 5).
) between the second core (5) and the second core (5).
is formed. Recording/reproducing gap (6) length 1
1 is defined by a pair of grooves +81+91 provided on both side surfaces of the first head element section (2).

On the other hand, the second head element section (3) has a third core (+0
+ and the fourth core (itl) are joined to each other, and at that time, as shown in the figure, they are connected to each other by the hole α provided in the center of the joint surface between them. A pair of divided erasing gaps α3)04) are respectively formed. A pair of groove portions (+5) ae+ are also provided on both sides of the second head element portion (3), respectively.
The length 12 of each of the erasing gaps α4) is defined by these groove portions 05) (IF5) and the hole portions (l).

Further, a predetermined winding groove (+7) is formed between the third core (1σ) and the fourth core (11), as described above. The first head element part (2) and the second head element part (3) are connected to the second core (6) and the @3 core (
101, whereby the first core (4), second core (5), third core f101, and fourth core (11) are arranged in series. It looks like this. The recording/reproducing gap (6) and the pair of erasing gears θ4) are arranged parallel to each other, and the recording/reproducing gap (6) extends near both side edges of the recording track formed by the recording/reproducing gap (6). A pair of erasing gaps t131 (+4
+ is configured to scan. 1214, the distance l!8 between both erasing gaps 03i (141) is equal to or slightly smaller than the length zi of the recording/reproducing gap (6), and this erasing gear 7p (13) (between 141 The interval 18 becomes the substantial recording track width.

Therefore, when using the magnetic head (1), both sides of the recording track become guard bands with almost completely no signals, so even if the track spacing is increased to increase the recording density, there is no signal from adjacent tracks during playback. No crosstalk occurs, and high track densities of 100 tracks/inch or more can be accommodated relatively easily.

By the way, when joining the first head element part (2) and the second head element part (3), in order to prevent mutual interference, the first head element part (2) and the second head element part (3) are
It is necessary to provide a predetermined interval between the second head element parts (2H31).As a method for providing this interval, for example,
@5Vc as shown in Figures 8 and 9.

A spacer θ~ of a predetermined thickness is sandwiched and temporarily bonded to both ends of the joint surfaces of the first and second head element parts +2++31, and then a PbO-8102-B2OB-based low contact point glass rod (19a ) is placed in the groove α (to), and this glass rod (X
9a) is melted and filled between both bonding surfaces, and the first and second head element parts +21 +31 are bonded with a predetermined interval, or a ceramic spacer of a predetermined thickness is used over the entire length. For example, there is a method of adhering with an epoxy-based organic adhesive to provide a predetermined interval.

(c) Problems to be solved by the invention When an epoxy adhesive is used, bonding is easy and the bonding condition is l-1t temperature, so there is less damage to the gap and side glass, and there are fewer problems with bonding. On the other hand, if the magnetic head is in contact with the magnetic sheet for a long time, the magnetic powder from the sheet will adhere to the epoxy adhesive and damage the sheet, and since the epoxy adhesive is soft, the bonding agent F! tA, and as a result, the powder on the sheet is scraped off at that part, which also causes noise.

On the other hand, when PbO-8102-B2Oa-based low contact point glass is used for bonding, there are problems with welding temperature and hardness. In the process of manufacturing the first head element part and the second head element part, core bonding is performed by glass welding, and this welding has a softening point of 550°C.
~600'C glass is used, and 650'C~7
It is welded at a temperature of 50°C. In order to bond the first head element part to the second head element part without damaging the side glass or magnetic gap, the glass used for the bonding must have a softening point of 400°C to 450°C. If not used, the operating cap will deform and become unusable if the temperature is higher than that.

Furthermore, in a PbO-5iOj'-B2Og glass IC, in order to obtain a glass having the above-mentioned softening point, P (7°) is required. However, if a large amount of PbO is contained, the hardness becomes low.

Generally, the hardness of glass used in magnetic heads is required to be about 400 $l/mm2 in terms of Vickers hardness, so it has not been possible to obtain satisfactory results with PbO-SiO2-B2OB glass.

B) Means for Solving All Problems The wooden FIA is equipped with a first head element section in which a recording/reproducing gap is formed, and a second head element section in which an erasing gap section is formed. A method for manufacturing a magnetic head in which the first head element portion and the second head element portion are joined with a read gap and an erase gap with their gap surface directions parallel to each other, the method comprising: PbO
-5f02-B2O8-A12Oa glass, Ca
Add O% Na2O and PbF2, q LeP
A glass bonding agent containing (69 - The first and second head element portions are bonded by interposing the bonding agent between the head element portion and the surface and melting the bonding agent.

(E) Function According to the method of the present invention, the first head element portion and the second head element portion can be bonded using a glass bonding agent having a low melting point and high hardness, so that a highly reliable magnetic head can be manufactured. can.

(F) Example Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5. Note that the same parts as in the conventional example are given the same reference numerals.

As shown in FIG. 1, a first core block 21) and a second core block for constituting the first head element part (2) are prepared, and the joint surface e24f of each is polished. After this, groove portions 0□□□ for forming the above-mentioned groove portions t8) and i9) and groove portions for forming the winding grooves (7) are formed, respectively. The interval between each groove □□□ or Fi groove corresponds to the length 11 of the recording/reproducing gap (6). Next, after forming a gap spacer with a thickness of about 1 μm on the fitting surface (support) or 9 by sputtering Si02, for example, both blocks t21022 are glass-fused together using high melting point glass.

On the other hand, as shown in FIG. 2, the second head element section (3)
Prepare the third core block c2~ and the fourth core block (29) for configuring the hole part (29) in the same manner as above.
12) and groove part it 51 (a groove part (3010υ) for configuring lφ and a groove part (to) for configuring the winding groove aη are formed, respectively.

The spacing between each groove (30) or 3υ corresponds to the length 12 of the erasing gap 0 pieces, and the length of the opening of each groove (30) or 3υ corresponds to the spacing 12 between the erasing gaps (l 041). These two blocks 29) are then joined to each other in the same manner as described above.

Next, the respective joint surfaces of the second core block (fourth and third core block?□□□) are polished as necessary so that each gap + e) NOω becomes parallel, and then,
A glass bonding material (a), which is a feature of the present invention, is interposed between both bonding surfaces.

Now, the glass bonding material (g) of the present invention is PbO-5i0
2-B2O8-At 2Oa system composition is used.Cab (oxidizing power ρsium) is added at around 10.1% by weight to push these components to generate bubbles, and Na2O (oxidizing power) is added to further lower the melting point. This PbO
By replacing part of the (lead oxide) component with PbF2 (lead fluoride), the softening point is lowered and the hardness is completely increased. That is, PbO-8102-B2O8-AI!2
CaO and Na2O are added to O8-based glass, and P
bO is (69-X) weight percent, PbF2 is
5) The composition is in weight percent.

Figure 5 shows Pb in the glass bonding agent with the basic composition mentioned above.
The substitution dragon of O component and PbFl, that is, pbo is (69
-X) Weight percent, PbF2 is X weight percent PbF2 is X weight percent
FIG. 3 is a characteristic diagram showing the relationship between hardness and softening point when the X weight percent of bF8 is changed. The composition of Ya at this time was 18.0 weight percent of B2O2 (boron oxide), 3.5 weight percent of 5i02 (silicon oxide), 7.4 weight percent of A7'2O8 (aluminum oxide), and 8. 2O is 2. Off, bond percentage, CaO is 0.1%. Also, a in the figure
indicates the softening point, and the symbol in the figure indicates the hardness. From this figure, Pb
It can be seen that when the FZ content is 5% by weight or more, the hardness increases and the softening point decreases.

Therefore, the amount of substitution with PbF2 is effective at 5 weight percent or more, preferably 10 weight percent or more.
weight percent or less.

For example, pbo is 59 Evercent, PbF2 is 10
Weight percent, B2O3 18 weight percent, AI
! 2O8 is 7.4% by weight, 5i023.5% by weight, N! a 2.0 weight percent of 2O,
Glass bonding agent with a composition of 0.1% by weight of CaO (
7) has a thermal expansion coefficient of 98 x 10''T/lice, hardness (Vickers) of 380 Kt/mm2, and a softening point of 440°C.
The following characteristics were obtained. Glass bonding agent formed in this way■
'The second head core (company) and the third head core? A spacer (4I) is interposed between the fathoms, and the welding temperature is 43.
Weld at 0°C and apply load LOP. By this welding, the first head element part (2) and the second head element part (3) are joined with a predetermined distance between them.

Then, after polishing the tape-contacting surface of the head block thus joined and formed as shown in FIG. 7 to define the depth of each gap (e103)04), this head block was Cut each magnetic head into pieces with a width of .

As mentioned above, what is the first head element section (2)? Since the bonding with the head element portion (3) of S2 can be performed at low temperature and in a short time, the glass used for gap formation welding is not affected. Moreover, since the glass member interposed between both head element parts +21f31 has a high hardness, a head with excellent wear resistance can be obtained.

In addition, even if the head core block is cleaned with various organic solvents in each process after joining, it will not deteriorate because it is joined with glass, making it easier to work with than with conventional adhesives. Yield improves.

(g) Effects of Example 1 As explained above, according to the method of the present invention, it is possible to provide a magnetic head with excellent military wear resistance, so head contamination and head clogging can be suppressed.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a perspective view of the first core block and @2 core block with grooves formed, respectively, and Figure 2 is the third core block.
Figure 3 is an exploded perspective view showing the state in which the first head element part and the head element part !2 are joined. Figure 6 is a characteristic diagram showing the relationship between the amount of PbF 2 substituted in a glass bonding agent used for glass bonding, hardness, and softening point. Figures 6 and 7 show the magnetic head, and Figure 6 is the external appearance. The perspective view, Figure vJ7, is a plan view of the disc contacting surface.
Figure js is an exploded perspective view, and Figure 9 is a front view. DESCRIPTION OF SYMBOLS 1... Magnetic head, 2... First head element part, 3
. . . second head element portion, 4 . . . first core, 5.
...Second core, lO...Third core, 11...Fourth core, 6.13.14...Gap, 21...
First core block, 22... second core block,
28... Third core block, 29... Fourth core block, 40... Adhesive member, 41... Ceramic material, 43... Glass.

Claims (1)

[Claims] (1) A first head element section in which a recording/reproducing gap is formed and a second head element section in which an erasing gap is formed, and the recording/reproducing gap and the erasing gap are the gap between the first head element section and the erasing gap. With the surface directions parallel to each other,
A method for manufacturing a magnetic head in which the first head element section and the second head element section are joined, the method comprising: PbO-SiO_
2-B_2O_8-Al_2O_8 glass, Ca
O, Na_2O and PbF_2, and the P
bO is (69-X) weight percent, PbF_2 is X(
However, by interposing a glass bonding agent having a composition of X≧5) between the bonding surface of the first head element portion and the bonding surface of the second head element portion, and melting this bonding agent, , a method for manufacturing a magnetic head characterized by joining a first and second head element portion.