JPH0620224A - Manufacture of magnetic-head spacer - Google Patents

Abstract

PURPOSE:To achieve that a magnetic-head spacer whose demagnetization force is high is manufactured at low cost. CONSTITUTION:An annealing treatment is executed to a magnetic material 8 in a wound state or in a single-wafer sheet state; plastic films 9 are pasted on both faces of the magnetic material 8 by an adhesive of a type which is cross-linked three-dimensionally. Then, this assembly is cut to the formation size of a head-core gap 2 for a magnetic head. A magnetic-head spacer 7 which is manufactured in this manner is mounted on the head-core gap 2 for the magnetic head 1. The magnetic-head spacer 7 whose thickness is uniform, whose dimensional accuracy is good and whose demagnetization force is high can be manufactured at low cost.

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 magnetic head spacer used for filling a head core gap in a magnetic head.

[0002]

2. Description of the Related Art Generally, a magnetic head such as a tape deck performs recording, reproducing and erasing on a magnetic tape. As shown in FIG. 1, a horseshoe-shaped head core 1 has a gap 2 in a part thereof. It is structured. In this case, a magnetic material such as ferrite or permalloy is used for the head core 1. Of these, the erase head is the head core 1
On the other hand, a current is applied to the coil 3 to generate a magnetic flux in the gap 2, and the magnetic flux 4 stronger than the residual magnetic flux 5 of the magnetic tape 4 erases the signal in the magnetic layer 4a. The width is about 50 μm, which is wider than that of the recording / reproducing head, and the gap 2 is filled with a glassy magnetic head spacer 7 as shown in FIG.

The magnetic head spacer 7 is manufactured by a method called a parylene treatment method. The magnetic head spacer 7 is subjected to a cutting process for forming a magnetic material 8 such as permalloy into a spacer shape, and an annealing process for removing magnetic strain of the magnetic material spacer. It is manufactured through a (annealing) process and a coating process (parylene process) process for forming the insulating layer 9 on the magnetic material spacer, and the thus manufactured product is loaded into the head core gap 2. ing.

[0004]

In the above-mentioned conventional method for manufacturing the magnetic head spacer, the cutting step for matching the magnetic material to the spacer shape is performed first, but the cutting size is about 2 mm × 5 mm, which is very large. Since it is small, handling is very complicated, mass productivity is poor, and therefore the cost is very high. Furthermore, in the parylene treatment step, since the insulation treatment is performed by chemical vapor deposition, variations in vapor deposition thickness are likely to occur, which leads to variations in dimensional accuracy and deterioration of performance (AC erasing).

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of manufacturing a magnetic head spacer which has a high demagnetizing force and can be manufactured at low cost. .

[0006]

In order to achieve the above object, a method of manufacturing a magnetic head spacer according to the present invention comprises a heat treatment step of annealing a magnetic material in a wound state or a sheet-like state and a heat treatment. Coating process to form an insulating layer by adhering a plastic film with a three-dimensional cross-linking type adhesive on both sides of the magnetic material, and cutting the coated magnetic material to the shape of the head core gap of the magnetic head It is characterized by comprising steps.

As the plastic film used in the above-mentioned coating treatment step, polyolefin, polyester,
Polyamide, it is preferable to use a general-purpose thermoplastic resin such as polystyrene, fluororesin, polycarbonate,
Engineering plastics such as polyacetal, polysulfone, modified polyphenylene oxide, and polyamideimide may be used, and thermosetting resins such as phenol, urea, melamine, epoxy, and silicon resin may be used.

As the adhesive for adhering the plastic film to the magnetic material, a three-dimensional cross-linking type such as polyurethane type or epoxy resin is suitable, and among them, it is preferable to use the thermosetting type. Thermoplastic adhesives such as polyolefin (α-olefin simple substance such as ethylene and propylene, or acid-modified copolymer with other α-olefin) and ethylene-vinyl acetate copolymer emulsion are not suitable.

[0009]

In the method of manufacturing a magnetic head spacer of the present invention described above, the heat treatment step and the coating treatment step are performed on a large-sized magnetic material in a wound state or a single-wafer sheet state. I can do it. Further, since the coating treatment step is performed by bonding with the film, the thickness accuracy is uniform and the dimensional accuracy is good.

[0010]

Example First, a sheet of permalloy (Permalloy PC, manufactured by Daido Steel Co., Ltd.) having a thickness of 100 μm was annealed. Specifically, 110 under hydrogen gas
After holding at 0 ° C. for 3 hours, it was gradually cooled at 600 ° C. for 4 hours and further at room temperature for 6 hours. The heat treatment process of applying this annealing is the same as the annealing in the conventional parylene treatment method.

Then, a polyester film having a thickness of 31 μm (Toyobo Co., Ltd., ester film) was bonded to both sides of the annealed permalloy sheet by a modified epoxy adhesive (ThreeBond, TB150).

The sheet thus obtained was punched into a size of 2 mm × 5 mm with a press die.

On the other hand, as Comparative Example 1, an acid-modified polyolefin (Sumitomo Chemical Co., Ltd., Bondine VOX-3) was used as the adhesive.
The thing using 10) was produced. As Comparative Example 2, a conventional parylene treatment method was prepared.

Table 1 shows the results of measuring the erasing impedance (Ω) at 1 kHz and 40 kHz by mounting the spacers of these Examples, Comparative Examples 1 and 2 in the head core gap of the erasing magnetic head.

[0015]

[Table 1]

As can be seen from these results, the demagnetizing force of the example is better than that of the comparative examples 1 and 2.

[0017]

As described above, according to the method of manufacturing the magnetic head spacer of the present invention, the magnetic material is subjected to the annealing treatment and the coating treatment at a large stage of the winding state or the single-wafer sheet state, and thereafter. Since it is cut into a spacer size with, the manufacturing process can be easily performed, and a spacer with uniform thickness accuracy and good dimensional accuracy can be obtained. That is, it is possible to manufacture a magnetic head spacer having high demagnetization force at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration example of a magnetic head.

FIG. 2 is a partially enlarged sectional view showing a head core gap portion of a magnetic head together with a magnetic head spacer.

[Explanation of symbols]

 1 Head Core 2 Gap 3 Coil 4 Magnetic Tape 4a Magnetic Layer 5 Residual Magnetic Flux 6 Magnetic Flux 7 Magnetic Head Spacer 8 Magnetic Material 9 Insulating Layer

Claims (1)

[Claims] 1. A heat treatment step of annealing a magnetic material in a wound state or a single-wafer sheet state, and a plastic film is adhered to both sides of the heat treated magnetic material with an adhesive of three-dimensional crosslinking to form an insulating layer. A method of manufacturing a magnetic head spacer, comprising: a coating treatment step of forming the coating material; and a cutting step of cutting the coated magnetic material into the shape and size of a head core gap in a magnetic head.