JPS6339121A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To improve the work efficiency by arranging a core chip in a slider so as to make one side face of the core chip mated with a side face of a slider pad thereby allowing a regulating work of a track width after the imbedding of the core chip. CONSTITUTION:A core chip 31 whose width at the upper face is processed to be a desired width (that is, width of a magnetic gap 36) is arranged in a slit 21a of a slider 21, glass molding is applied and the upper face of the core chip and the slider pad is ground. Although the width CW is increased by the grinding, the value CW is brought into a desired value by grinding side faces 33b, 34b of the core chip 31. Furthermore, the value CW increased by the upper face grinding after the imbedding to the slider is expected and the width CW is formed somewhat narrower than the desired value by the share in forming the core chip 31 itself to eliminate the grinding of the core chip 31 after imbedding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a floating magnetic head used in fixed magnetic disk drives.

Conventional technology The magnetic heads used in fixed magnetic disk drives include:
A monolithic type magnetic head in which the slider forms part of the magnetic path, and a closed magnetic path is formed by the core chip alone.
Composite type magnetic heads are mainly used in which this core chip is embedded in a slider made of a non-magnetic material. Among these, composite-type magnetic heads in particular have higher mechanical strength than monolithic-type magnetic heads. Since it is embedded in a recess formed in a non-magnetic slider and molded with glass, it has the characteristic that the strength of the core is not lost, and its applications tend to expand.

Below is a fourth example of a conventional monolithic magnetic head.
This will be explained with reference to the figures.

In FIG. 4, reference numeral 1 denotes a slider made of a material such as non-magnetic ceramic, and this slider includes slider pads 2 and 3 and a groove 4 sandwiched between the slider pads 2 and 3. There is. Further, one end (air inflow end) of the slider pad 2.3 has an inclined surface 5.
6 is formed, and the upper corner portions of both side portions 7, 8, 9, and 10 are chamfered. Note that 11.12 is an air outflow end.

0 is a core chip made of a magnetic material, which is placed in a slit a provided in the slider 1;
It is glass molded.

Next, the above-mentioned core chip 6 will be explained with reference to FIG.

As shown in FIG. 5, the core depth 6 has a square-shaped core 13 and a C-shaped core 14 joined together using an adhesive such as glass or resin. Although not shown, a coil is wound around the outer periphery of the body portion 14a of the C-shaped core 14.

Problems to be Solved by the Invention As mentioned above, with the demand for narrower track widths, the core width CW on the upper surface of the core chip 6 is narrowed.
The overall width of the core chip 13 and the C-type core 14 is narrowed (which may cause an increase in magnetic resistance, etc.).As shown in FIG. be.

In addition, the core depth 6 is the flat part 2a of the slider pad 2.
After the upper surface 6a is placed in a slit a provided in the core chip and glass-molded, its upper surface 6a is polished together with the flat surface 2a of the slider pad 2, so that the track width, that is, the core chip Top width CW
In order to prevent the width from changing, the width is CW for a predetermined length 2 from the -h- plane. For this reason,
As mentioned above, although the width of the core chip 6 other than the upper part is widened and the increase in magnetic resistance is somewhat suppressed, the width of the magnetic guide path 12 is still narrowed and the increase in magnetic resistance cannot be avoided. As described above, since the core width CW portion spans the length e, cracks are likely to occur in this portion, and there is a gap that significantly reduces the processing yield.

Furthermore, the core depth 6 must be vertically inserted into the slit portion la of the slider 1, accurately positioned, and then glass molded. If the core depth 6 is fixed in a tilted state within the slit area a, the top surface of the core chip must be ground diagonally when checking the polishing of the top surface of the core depth and the top surface of the slider pad. This is because the width of the magnetic gap 15, that is, the track width increases. This has been an obstacle to improving work efficiency.

Means for Solving the Problems Therefore, the floating magnetic head of the present invention has a magnetic recording medium sliding surface of the core chip and one side surface connected to this sliding surface and polished in the magnetic recording medium sliding direction. A core depth accommodating recess is provided so that both core depths are accommodated in the slider in an exposed state.

"Action" By having a two-leg configuration, there is a core and f inside the slider.
- After embedding the knob and glass molding, it is possible to polish and grind one side of the core chip. In other words, the work to regulate the track width can be done after embedding the core chip.

Embodiment Hereinafter, a floating magnetic head according to an embodiment of the present invention will be explained with reference to FIG.

In the figure, reference numeral 21 denotes a slider made of a material 11 such as non-magnetic ceramic. ) has slope 2
5.26 are formed and the longitudinal sides 27, 28,
29.30 is chamfered. Further, a groove portion 24 is formed between the slider pads 25 and 26. 31 is a slit portion 2 provided in the slider 21
The core chip 31 is placed inside the core chip 1a and is glass-molded, and the sliding surfaces 33a and 34a of this core chip 31 with respect to the magnetic recording medium and the side surface 32 extending in the recording medium sliding direction (in the direction of the arrow) are respectively as described above. It is flush with the upper surface of the slider pad and the wall 11 of the groove portion 24, that is, one side surface 28 of the slider pad 21.

As shown in FIG. 2, the above-mentioned core depth 31 is formed by adhering an I-shaped core 33 and a C-shaped core 34 made of a magnetic material with a glass or resin adhesive or the like. Although not shown, the body 3 of the front XEC type core 34
A coil is wound around the outer circumference of 4d. In addition, the above 2
The upper surfaces of the two cores 33 and 34, that is, the sliding surfaces 33a and 34a with respect to the magnetic recording medium, are processed to be at right angles to the one side surfaces 33b and 34b of both cores.
Inclined surfaces 33c and 34C are formed on the upper portions of b and 34b.

Then, the core chip 31 processed so that the width of the upper surface of the core depth (that is, the width of the magnetic gap 36) CW becomes a desired width is placed in the slit portion 1a of the slider 21,
After glass molding, the top surface of the core depth and the top surface of the slider pad are polished. This polishing operation increases the CW, but by subsequently polishing the side surfaces 33b and 34b of the core chip 31, the CW can be made to a desired value. In addition, the width of the CW when manufacturing the core chip 31 alone is made slightly narrower than the desired value by anticipating in advance the value of the CW that will expand due to the polishing work on the top surface after embedding it in the slider.
This makes it possible to eliminate or reduce the polishing work of the core chip 31 after the embedding work.

Next, a second embodiment of the present invention will be briefly described.

FIG. 3 is a perspective view of the floating magnetic head of the second embodiment, and in this embodiment, the side surfaces 33b, 3 of the core chip 31
4b is formed so as to be flush with the outer surface 35a of the slider pad 35. Since this is the same as in the first embodiment described above, the following explanation will be omitted.

As described in detail, in the floating magnetic head of the present invention, the core chip is disposed within the slider so that one side of the core chip is flush with the side of the slider pad, so that one side of the core depth is placed flush with the side of the slider pad after glass molding. It becomes possible to polish and grind the side surfaces, that is, the track width regulation work can be performed after the core chip embedding work, and work efficiency can be improved. In addition, compared to the conventional case where the magnetic path near the magnetic gear part is narrow, the magnetic path near the magnetic gap can be made larger in the present invention.
The increase in magnetic resistance can be suppressed to a small level, and therefore the deterioration of magnetic properties can also be suppressed to a small level. Furthermore, the positioning accuracy when placing the core chip in the recess provided in the slider is very high (even if it is not, the track width can be formed with high precision in subsequent processing, and the polishing of the chip core placed in the slider is Since the chamfering process and the chamfering process on the side surface of the slider pad can be performed in the same process, it is possible to reduce the number of work steps.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a floating magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view of a core chip used in the same embodiment, and FIG.
FIG. 4 is a perspective view of a floating magnetic head of the second embodiment, FIG. 4 is a perspective view of a conventional floating magnetic head, and FIG. 5 is a perspective view of a core chip used in the conventional example.

Claims (1)

[Claims] A core chip formed of a magnetic material, a magnetic recording medium sliding surface of this core chip, and one side surface connected to this sliding surface and extending in the magnetic recording medium sliding direction are all housed in a state where the core chip is exposed. A floating magnetic head characterized by having a slider having a recessed portion.