JPH05314450A - Floating magnetic head manufacturing method - Google Patents

Abstract

(57) [Summary] [Purpose] The handling of the core chip and the work of fixing it to the slider material are significantly reduced, and the thickness design value of the core chip can be made thinner than before, improving electromagnetic conversion characteristics and mass producing at low cost. Provided is a method of manufacturing a high-quality floating magnetic head that is suitable for magnetic properties. [Structure] A slider material 33 partially having a cutout portion 35 and a core chip block 21 having a larger thickness than a normal core chip are prepared, and the core chip block 21 is molded into a glass glass 36 in the cutout portion 35 of the slider material 33.
After fixing with, the lateral width of the slider material 33 and the core chip thickness are simultaneously regulated to their respective design values to manufacture a floating magnetic head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a floating magnetic head used in a fixed magnetic disk device or the like.

[0002]

2. Description of the Related Art In recent years, along with the miniaturization of hard disk drives, there has been a demand for miniaturization and higher precision of floating magnetic heads.

A conventional method of manufacturing a floating magnetic head will be described below with reference to FIGS. FIG. 14 is a perspective view of a conventional core chip. In FIG. 14, reference numeral 1 is a conventional core chip formed of an oxide magnetic material such as ferrite, and this core chip 1 is provided with a gap portion 2 for performing electromagnetic conversion operation and a track portion 3 for performing electromagnetic conversion operation. Has been. In addition, T is the core chip 1
Is the thickness of.

Next, a method for manufacturing the core chip 1 will be described with reference to FIG.
This will be described with reference to FIGS. First, in FIG.
4 is a gapped bar, and this gapped bar 4 is
I bar 5 and C made of oxide magnetic material such as ferrite
The bar 6 and the bar 6 are joined together via a gap portion 2 having a predetermined gap length. The bonding material between the I-bar 5 and the C-bar 6 is the glass of the gap itself, and 7 in FIG. 15 is a reinforcing glass (bonding glass).

The gapd bar 4 in this state is thinly sliced as shown in FIG. 16 to obtain the core chip 1. Here, both side surfaces 1a and 1b of the core chip 1 are mirror-finished.
Next, as shown in FIG. 17, a part of the core chip 1 is ground by a grinding wheel 8 to form a track portion 3.

The conventional core chip 1 (see FIG. 14) is manufactured as described above. FIG. 18 is a perspective view of a conventional slider material. Reference numeral 9 in FIG. 18 is a slider material formed of a non-magnetic material such as ceramics,
A pair of levitation rails 10 are formed on the upper surface 9a of the slider material 9, that is, the surface facing the magnetic recording medium. A coil groove 11 for winding a recording / reproducing coil is formed on one end surface 9b (trailing surface) of the slider material 9 in the longitudinal direction, and one end surface 9b of the slider material 9 and one end surface 9b are formed. A slit portion 12 for mounting a core chip is formed across the levitation rail 10.

A conventional method of manufacturing a floating magnetic head using the slider material 9 and the core chip 1 configured as described above will be described below. First, as shown in FIG. 19, the core chip 1 is placed in the slit portion 12 of the slider material 9.
Is temporarily fixed by a spacer 13 made of a metal for temporary fixing. Next, the glass material 14 (mold glass) with a low separation point
Then, the front surface is molded and the slider material 9 and the core chip 1 are permanently fixed. After that, the spacers 13 arranged on the bottom surface side are removed, and as shown in FIG.
Use 5 to reinforce. Next, as shown in FIG. 21, the levitation rail 10 of the slider material 9 is mirror-finished by lapping until it reaches a predetermined total height h. After that, each levitation rail 10 is formed with a taper portion 16 having an angle of 40 'to 50' on the leading side, and a taper portion 17 having an angle of 20 ° from the vicinity of the magnetic gap on the trailing side.

[0008]

However, in the above-mentioned conventional structure, the core chip 1 is downsized and the handling thereof is very difficult, but the core chip 1 is difficult to handle.
Must be inserted into the narrow slit portion 12 of the slider material 9 and fixed with a spacer 13 made of metal,
This process is very precise and cumbersome and inferior in workability.
The productivity was significantly hindered. Further, from the viewpoint of characteristics, the core chip 1 is required to have a thin thickness of about 100 μm, but in the above-mentioned conventional technique, such a thin core chip is required due to problems in handling and processing. It was very difficult to manufacture the floating magnetic head of No. 1.

The present invention solves the above-mentioned problems of the prior art by significantly reducing the work of handling the core chip and fixing the core chip to the slider material, and by manufacturing using a thin core chip, electromagnetic conversion The purpose is to obtain a high-quality floating magnetic head with improved characteristics, low cost and suitable for mass production.

[0010]

In order to solve the above problems, in the method of manufacturing a floating magnetic head according to the present invention, notches are formed in a part of a slider instead of slits, and the thickness is completed. Prepare a core chip block that is larger and more workable than the state, and fix this core chip block to the cutout part of the slider material with glass material or resin material, and then to the side surface of the slider material (core chip fixed side) and the core chip block. By cutting off a part at the same time,
It has a step of simultaneously controlling the lateral width of the slider and the thickness of the core chip block to complete the core chip.

[0011]

With the above construction, the core chip block, which is thicker than the completed state and excellent in workability, is fixed to the cutout portion of the slider material, so that the core chip can be easily handled and the depth control can be facilitated. Also,
Since the work of fixing the core chip and the slider material can be done easily, the number of work steps can be reduced and the productivity is improved. Moreover, since the core chip can be made thinner, a magnetic head suitable for high density recording can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 21 is a core chip block formed of an oxide magnetic material such as ferrite, and the core chip block 21 is provided with a gap portion 22 for performing electromagnetic conversion operation and a track portion 23 for performing electromagnetic conversion operation. In addition, the reinforcing glass 25 for the track portion 23 is molded in the groove portion 24.
The thickness t ₁ of the core chip block 21 is about ₁ mm to 2 mm,
It is preferably about 1.5 mm, and the core chip block 21
It is easy to handle.

Here, a method of manufacturing the core chip block 21 configured as above will be described with reference to FIGS. First, the gapped bar 26 shown in FIG. 2 is prepared, and as shown in FIG. 3, the groove portion 24 is formed and the core chip block 21 is cut by the multi-grinding grindstone 30 at the same time. The gap bar 26 shown in FIG.
It is the same as the conventional one shown in (1), 27 is I bar, 28 is C bar, and 29 is bonding glass.
Then, when forming the groove portion 24, as shown in FIG. 4, the groove depth A from the upper surface 21a of the core chip block 21 and the shortest distance B from the arc portion 29a of the bonding glass 29 to the upper surface 21a of the core chip block 21. , The dimension C from the apex portion 21b of the core chip block 21 to the core chip block upper surface 21a is C + 50 μm
The groove 24 is formed so that <A <B-50 μm.

Next, as shown in FIG. 5, a reinforcing glass 25 is molded in the groove 24 of each core chip block 12. The reinforcing glass 25 is made of glass having a coefficient of thermal expansion d substantially equal to that of the bonding glass 29 of the gapped bar 26 and the mold glass 36 used in the subsequent step, and having a working temperature higher than that of the mold glass 36 by 50 ° C. or more. use. Further, when the temperature of the furnace is lowered at the time of molding the reinforcing glass 25 at a temperature of 100 ° C. or lower / 30 minutes, the strain of the ferrite part at the time of molding can be removed.

Next, as shown in FIG. 6, both side surfaces 21c of the core chip block 21 are mirror-finished, and finally, a track portion 23 is formed on the core chip block 21 as shown in FIG. Reference numeral 31 is a grinding wheel for forming the track portion 23.

In FIG. 8, reference numeral 33 denotes a slider material formed of a non-magnetic material such as ceramics. The longitudinal end surface 33a of the slider material 33 has a coil groove 34 for winding a recording / reproducing coil and a core chip block fixed. And a notch portion 35 for forming.

A method of manufacturing a floating magnetic head using the slider material 33 and the core chip block 21 of the present embodiment configured as above will be described below. First, as shown in FIG. 9, the core chip block 21 is installed in the cutout portion 35 formed in the slider material 33, and the core chip block 21 is fixed to the slider material 33 with the mold glass 36, and then the front surface of the slider material 33. The portion 33b is mirror-finished to finish the slider total height H and the back depth dimension D to the design dimension. At that time, since the back depth dimension D can be observed from the side surface, by controlling it, the original back depth dimension D ′ that can be finished to the same dimension can be easily finished to the design dimension.

Then, as shown in FIG. 10, the lateral width E of the slider material 33 and the core chip thickness t ₂ are processed into predetermined design dimensions (the core chip thickness t ₂ is required to be about 100 to 150 μm from the market). Has been).

Next, as shown in FIG. 11, the slider material 3
3, a pair of levitation rails 37 are formed on the upper surface 33b, and thereafter, as shown in FIG. 12, tapered portions 38 having angles 40 'to 50' are formed on the leading side of the levitation rail 37.
Further, a taper portion 39 having an angle of 20 ° is formed near the gap on the trailing side.

FIG. 13 shows another embodiment for manufacturing the core chip block 21 of FIG. 1, in which several groove portions 24 are formed in the gap bar 26, and after the reinforcing glass 25 is molded in the groove portions 24, the reinforcing glass 25 is molded. The machining of the track portion 23 and the cutting into the core chip block 21 are simultaneously performed by the multi-grinding grindstone 40. By doing so, the productivity of the core chip block 21 can be improved. Here, the dimensions of the groove 24 and the conditions of the reinforcing glass 25 are the same as those in the above-described embodiment.

If the floating magnetic head is manufactured as described above, the core chip block 2 larger than the core chip 21 'is produced.
After fixing 1 to the slider material 33, the core chip 21 '
It is not necessary to handle a small core chip 21 ′ to form a core chip, and there is no need to insert a core chip into a narrow slit portion of a slider material and fix it with a metal spacer as in the conventional case.
By controlling the back depth monitor that can be observed from the side surface of the slider member 33, a predetermined back depth dimension can be easily obtained, so that workability and productivity can be significantly improved.

Further, in the present invention, the core chip thickness t ₂
Can be formed smaller, so that a floating magnetic head with lower inductance can be provided, and the electromagnetic conversion characteristics can be improved.

[0023]

As described above, according to the present invention, a notch portion is provided instead of the slit portion of the slider material, and a core chip block having a larger thickness than that in a completed state and excellent in workability is prepared. After fixing the block to the slider notch, the slider lateral width and the core chip block thickness are simultaneously finished to the final dimensions to complete the core chip, which makes it easier to handle the core chip.
Further, the core chip and the slider material can be easily fixed to each other, and the number of handling steps can be significantly reduced. Furthermore, since the back depth monitor, which can observe the back depth dimension regulation from the side surface of the slider material, can be controlled, workability and productivity can be significantly improved. Further, since the thickness of the core chip after completion can be made thinner than before, the quality of electromagnetic conversion characteristics can be improved, and an excellent floating magnetic head can be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view of a core chip block used in a method of manufacturing a floating magnetic head according to an embodiment of the present invention.

FIG. 2 is a perspective view of a gapped bar used in the method of manufacturing the floating magnetic head.

FIG. 3 is a cross-sectional view when a grooved bar is cut and cut at the same time in the method of manufacturing the floating magnetic head.

FIG. 4 is a side view of a gapped bar used in the method of manufacturing the floating magnetic head.

FIG. 5 is a perspective view when a reinforcing glass is molded on the core chip block in the method of manufacturing the floating magnetic head.

FIG. 6 is a perspective view when mirror-finishing both side surfaces of the core chip block in the method of manufacturing the floating magnetic head.

FIG. 7 is a cross-sectional view when a grinding process for forming a track portion is performed on a core chip block in the method of manufacturing the floating magnetic head.

FIG. 8 is a perspective view of a slider material used in the method of manufacturing the floating magnetic head.

FIG. 9 is a perspective view showing a state where the slider material and the core chip block are fixed by glass in the method of manufacturing the floating magnetic head.

FIG. 10 is a perspective view showing a state in which the lateral width of the slider material and the thickness of the core chip block are restricted in the method of manufacturing the floating magnetic head.

FIG. 11 is a perspective view showing a state in which a flying rail is formed on a slider material in the method of manufacturing the floating magnetic head.

FIG. 12 is a perspective view of the floating magnetic head in the method of manufacturing the floating magnetic head.

FIG. 13 is a cross-sectional view of the method of manufacturing a floating magnetic head according to another embodiment of the present invention when cutting the gap bar and processing the track portion at the same time.

FIG. 14 is a perspective view of a core chip in a conventional method of manufacturing a floating magnetic head.

FIG. 15 is a perspective view of a gapped bar in a conventional method of manufacturing a floating magnetic head.

FIG. 16 is a perspective view of a core chip in a state where a gapped bar is sliced in a conventional method of manufacturing a floating magnetic head.

FIG. 17 is a cross-sectional view when a grinding process for forming a track portion is performed on a core chip block in a conventional method of manufacturing a floating magnetic head.

FIG. 18 is a perspective view of a slider material in a conventional method of manufacturing a floating magnetic head.

FIG. 19 is a perspective view of a main part when a core chip is temporarily fixed to a slider material in a conventional method of manufacturing a floating magnetic head.

FIG. 20 is a perspective view of a main part when resin is reinforced during slider material assembly in a conventional method of manufacturing a floating magnetic head.

FIG. 21 is a perspective view of a conventional floating magnetic head manufacturing method when the floating magnetic head is completed.

[Explanation of symbols]

Reference Signs List 21 core chip block 21 'core chip 22 gap part 23 track part 24 groove part 25 reinforcing glass 26 gapped bar 29 bonding glass 30,40 multi-grinding grindstone 33 slider material 34 coil groove 35 cutout part 36 mold glass t ₁ core chip block thickness T ₂ Core chip thickness E Horizontal width of slider material

Claims (1)

[Claims] 1. A notch for fixing a core chip is provided on a side surface of a slider material, and a core chip block, which is thicker than a thickness in a completed state and has a track part formed in a part thereof, is fixed to the notch with glass. Then, after that, the method of manufacturing the floating magnetic head includes a step of finishing the lateral width of the slider material to a predetermined dimension and finishing the thickness of the core chip to the finished thickness.