JPH0281305A - Production of magnetic head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial Application Field J The present invention relates to a method of manufacturing a magnetic head for magnetic recording.

[Conventional technology]

Conventional magnetic heads generally include bulk heads made by mechanical processing and thin film heads made by thin film forming processing.

Although the bulk head and the III head each have many performance advantages, the manufacturing process is complicated and difficult to automate, resulting in high manufacturing costs.

Recently, with the advancement of information, the requirements for printers, which are computer output devices, have become more sophisticated.0For example,
Features include high-speed printing, high-speed multi-copying, high-quality printing, and printing stability.

In this situation, magnetic printers are attracting attention. In order to increase the speed of a magnetic printer, it is conceivable to use multiple magnetic heads.

However, the use of multiple magnetic heads significantly increased the cost of magnetic printers, making it difficult for the product to gain acceptance in the market.

Therefore, conventional magnetic blinkers have responded to higher speeds by reducing the number of magnetic heads as much as possible and increasing the number of rotations of the magnetic drum.

[Problem to be solved by the invention] However, in the magnetic printer as described above, the load is placed on the frame, chassis, motor, electricity, etc., so overall the negative factors in terms of cost and size are outweighed, and it is currently not successful in the market. In addition, even if a multi-head configuration is attempted with a thin film head, it is difficult to obtain dimension and positional accuracy around the gap such as the gap depth.

SUMMARY OF THE INVENTION The present invention is intended to solve this problem, and its purpose is to manufacture a plurality of magnetic heads at low cost and with high precision.

[Means to solve the problem]

The method for manufacturing a magnetic head of the present invention is used in a perpendicular magnetic recording device that performs recording and reproduction by bringing a recording medium and a main pole of a perpendicular magnetic recording head into contact and moving them relative to each other. The magnetic pole is characterized by forming six planar coils on a non-magnetic substrate with holes of approximately the same dimensions as the main magnetic pole and bonding them together.

As shown in FIGS. 1 to 3, the method for manufacturing a magnetic head of the present invention involves cutting a magnetic material by dicing to provide unevenness. The convex portion is called the perpendicular magnetic pole portion of this head.

Magnetic materials used here include amorphous metal iron, ferrite, and the like.

Next, the formation of the excitation coil and insulator is shown in Figures 4 and 5. This is done by placing the excitation coil and insulator on a non-magnetic plate (for example, a flexible film) with a predetermined diameter (slightly larger diameter than the diameter of the vertical magnetic pole part). A hole is made using a press, and a planar coil is formed around the hole.

After this coil part and the coil support (insulator between the magnetic material and the excitation coil) are overlapped with the magnetic material as shown in Figure 6, a protective layer is formed and the head is completed.

According to the above method, it is easy to assemble the excitation coil section, which is subjected to a large load in bulk processing, and furthermore, the lff
! The use of a planar coil made it possible to downsize the head. Furthermore, since the coil support is an insulator, there is no need to form an insulating layer again, which has the advantage that a low-cost head can be manufactured.

[Example 11] Hereinafter, the present invention will be described in detail based on Examples.

The ferrite material is diced to a predetermined size (thickness 5
0 um), and then cut into the shape shown in Figure 3 using the same machine to form a magnetic pole. The magnetic pole width at this time is 50μm
And so.

Also, regarding the formation of the excitation coil part, first
Holes with a diameter of 60 μm were press punched into a thick polyimide film at the same pitch as the magnetic poles shown above. After cleaning, Cu pus was removed by sputtering at 1500A.
It was treated as conductive suppuration.

Next, as shown in FIG. 6, a photoresist was applied, and after preliminary baking, selective exposure, etching, main baking, and patterning were performed. Copper plating was applied thereto to a thickness of approximately 5 μm, and the conductive layer was etched by reverse sputtering to form an excitation coil.

Next, as shown in Figure 6, the ferrite magnetic pole part and the excitation coil film were stacked, the magnetic pole was passed through the hole in the film, and adhesive was poured to fix the excitation coil film to the ferrite, completing the magnetic head.

Next, after applying 30 μm of non-magnetic nickel phosphor plating to pure iron, the above magnetic head writing evaluation was performed using a magnetic recording medium on which a Co, Ni, and P ferromagnetic film of 350 Oersted Hc, 6000 Gauss of Br, and a 5 μm thick Co, Ni, and P ferromagnetic film was formed. Ta. For writing evaluation, see Figure 8. After confirming latent image formation with Magnet Pure, magnetic toner was attached magnetically, and it was confirmed that sufficient adhesion and selectivity could be obtained.

[Example 2] Ferrite material is diced to a predetermined size (thickness 5
0 μm) and then cut into the shape shown in Figure 3 using the same machine to form a magnetic pole. The magnetic pole width at this time is 50μm
And so.

Also, regarding the formation of the excitation coil section, see 12.5 in the beginning.
A 10 um thick copper foil was laminated onto a 10 um thick polyimide film, and press punched at the same pitch as the magnetic poles shown above.

Next, after thorough cleaning, apply photoresist.
After pre-baking, selective exposure, etching, final firing and buttering were carried out.

Next, the excitation coil was formed by immersing it in a ferric chloride solution and etching away the excess copper foil.

Next, as shown in Figure 6, the ferrite magnetic pole part and the excitation coil film were stacked, the magnetic pole was passed through the hole in the film, and adhesive was poured to fix the excitation coil film to the ferrite, completing the magnetic head.

Next, after applying 30 μm of non-magnetic nickel plating to pure iron, the above magnetic head writing evaluation was performed using a magnetic recording medium on which a 5 μm thick Co, Ni, and P ferromagnetic film was formed with Hc350 Oersted, Br6000 Gauss, and 5 μm thick. I did it. For writing evaluation, see Figure 8. After confirming latent image formation with Magnet Pure, magnetic toner was attached magnetically, and it was confirmed that sufficient adhesion and selectivity could be obtained.

[Effects of the Invention] As described above, the method for manufacturing a magnetic head of the present invention is characterized by eliminating the need for a winding process, allowing for cost reduction, accurate manufacturing at low cost, and the like.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a bulk magnetic material with high magnetic permeability. Figure 2 is a conceptual diagram of cutting bulk magnetic material to a predetermined thickness. Figure 3 is a conceptual diagram showing the formation of the main magnetic pole and return magnetic pole. FIG. 4 is a conceptual diagram in which a hole is drilled in an insulating substrate to a size that allows the main magnetic pole to be inserted therein. FIG. 5 is a conceptual diagram of an excitation coil formed around a hole. FIG. 6 is a conceptual diagram in which a bulk magnetic material and a substrate provided with an excitation coil are bonded together. FIG. 7 is a conceptual diagram of a multi-head application example of the present invention. ■... Bulk 6n magnetic body with high magnetic permeability 2... Main magnetic pole, return magnetic pole, insulating substrate, excitation coil, excitation coil and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (and others) 1 person) Figure 4 Figure 7

Claims (1)

[Claims] In a perpendicular magnetic recording device that performs recording and reproduction by bringing the recording medium and the main magnetic pole of a perpendicular magnetic recording head into contact and moving them relative to each other, the main magnetic pole is made of a bulk magnetic material with high magnetic permeability, and the main magnetic pole has approximately the same dimensions as the main magnetic pole. A method for manufacturing a magnetic head, characterized in that a planar coil is formed around a hole on a non-magnetic substrate and bonded to the hole.