JPS6364618A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To contrive to improve magnetic efficiency and mechanical strength by cutting out a core chip setting the thickness of the rear part of a core block having polished back face larger than the thickness of the front face, and after attaching a slider to the front side, adjusting the gap depth. CONSTITUTION:Concave parts 18, 19 having specific pitch are formed, and a track worked core block 2 is formed inside of them by burying a nonmagnetic body 20. A read write side core 4 and an erasing side core 6 of the block 2 are joined in the side of center cores 8, 10 providing a cap 12. The back side part of the block 2 is cut off, and at the same time, and the back side part 40 is polished to a mirror face setting a specific size from the top 38 of the core. A V-shaped groove 42 is formed at a fixed width on the front side of the block 2 taking the track width T at the center. A core chip 44 is formed by cutting out around the tip of deep part of the groove 42. After attaching sliders 46, 48 to the front of the chip 44, the gap depth GD is adjusted. Thus, magnetic efficiency can be bettered and mechanical strength can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head that performs magnetic recording and reproduction on a magnetic recording medium such as a floppy disk device (FDD).

[Conventional technology]

Conventionally, in a core used in, for example, a bulk type magnetic head corresponding to an FDD, a core block 2 is formed with trunk processing, as shown in FIG. 2(A). This core block 2 is made by joining a read/write side core 4 and an erase side core 6 with a gap 12 provided on the center core 8.10 side, and 14 is provided on the read/write side core 4 by joining with the center core 8. working gap, 1
6 is the erase side core 6 by joining with the center core 10.
18.19 is a recess, 20 is a non-magnetic material such as glass filled in the recess 18.19, and T represents the track width.

Next, as shown in FIG. 2B, the core chip 22 is cut out with a constant width in a slicing process with the drug width T at the center.

Next, for each core chip 22, as shown in FIG. 2C, the entire thickness of the core forming the magnetic circuit is mirror-finished by double-sided polishing. La is the lamp removal allowance for mirror finishing.

Next, as shown in FIG. 2 (CD), this core chip 2
Sliders 24 and 26 are attached to both sides of the core 28 to form a core 28, and the back side of the slider 24 and 26 is set to the depth reference plane 30 with respect to this core 28.
Surface 32 is polished to
Gap Depth) Adjust GD.

Next, a read/write coil 34 is attached to the read/write side core 4 of this core 28, and an erase coil 36 is attached to the erase side core 6, and then a core chip 37 is attached to the core 28 to complete the magnetic head.

[Problem that the invention seeks to solve]

In this method of manufacturing a magnetic head, the core chip 22
Since the mirror polishing process is performed individually for each core chip 22 cut out from the core block 2, dimensional accuracy is low and dimensional irregularities occur. Also, the slider 24.
26 is installed later by performing gear dip cutting with reference to the slider 24 and 26, which makes it difficult to control the gear gap CD and has drawbacks such as low mechanical strength.

Therefore, the present invention aims to provide a method for manufacturing a magnetic head with improved mechanical precision and mechanical strength.

[Means for solving problems]

As shown in FIG. 1, the method for manufacturing a magnetic head of the present invention is as follows:
At the same time, the thickness of the rear part of the core is set larger than the thickness of the front part of the core block 2, and the core chip 44 is polished.
Cut out a slider 4 on the front side of this core chip 44.
After installing 6.48, adjust the gear sop dibs GD using the rear of the core as a reference.

[For production]

The method for manufacturing a magnetic head of the present invention includes (a) polishing the back surface 40 of the core block 2, and (b) cutting out a core chip 44 with the thickness of the rear surface larger than the thickness of the front surface of the core block 2. , (C) Slider 46 to the front side of the core chip 44.
48, and (d) adjustment of the gap depth GD using the back surface 40 of the core chip 44 as the gap depth reference plane, so that mechanical accuracy and dimensional accuracy can be improved. At the same time, the mechanical strength is increased.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a specific embodiment of the method for manufacturing a magnetic head of the present invention.

As shown in FIG. 1(A), a trunk-processed core block 2 is formed by forming recesses 18 and 19 with a specific pinch and embedding a non-magnetic material 20 such as glass inside the recesses 18 and 19. do.

This core block 2 is made by joining a read/write side core 4 and an erase side core 6 with a gap 12 provided on the center core 8.10 side, and an operating gap between the read/write side core 4 and the center core 8. 14. An operating gap 16 is formed between the erase side core 6 and the center core 10, and T represents the trunk width.

Next, as shown in FIG. 1B, the back surface of the core block 2 is cut off, a specific dimension is set from the core apex 38, and the back surface 40 is polished to a mirror finish. become

Next, as shown in FIG. 1C, core thickness processing is performed at a constant pitch on the front side of the core block 2, with the center width T being taken at the center. In this case, a groove 42 having a constant width and a deep V-shape is formed.

Next, as shown in FIG. 1D, slicing is performed centering on the deep end narrow portion of the groove 42, and the core block 2 is cut out at regular intervals to form a core chip 44. When cut in this manner, the shape of the core chip 44 on the side surface side has a thickness dl on the rear side larger than a thickness dl on the front side due to the shape of the groove 42.

Next, as shown in FIG. 1E, after attaching sliders 46 and 48 to the front side surface of the core chip 44 to form the core 52, the gap depth is Perform processing and gap depth CD
Adjust to within standard dimensions.

Next, as shown in FIG. 1(F), after incorporating the coils 54 and 56 into the core 52,
A core piece (bank bar) 50 on the rear side is tightly fixed to the magnetic head to complete the magnetic head.

When a magnetic head is manufactured using such a manufacturing process, since the core thickness dimension on the front side of the core 52 can be machined, mechanical precision is high (and irregularities in dimension can be prevented. It is easy to polish the back side of the back side, and multi-processing is possible, so the joint with the rear core piece 50 is good, and the cross-sectional area of the rear part is large, so
Magnetic efficiency is improved by reducing magnetic resistance, and mechanical strength, such as improved bonding strength with rear core piece 50, is increased.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily manufacture a magnetic head with enhanced mechanical precision and mechanical strength and improved En magnetic efficiency, thereby improving manufacturing efficiency.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the method for manufacturing a magnetic head of the present invention, and FIG. 2 is a diagram showing a conventional method for manufacturing a magnetic head. 2... Core block, 40... Back part, 44...
Core chip, 46.48...Slider.

Claims (1)

[Claims] The back surface of the track-processed core block is polished, the thickness of the rear part of the core is set larger than the thickness of the front part of the core block, and a core chip is cut out. After attaching a slider to the front side of this core chip, the gap A method of manufacturing a magnetic head, characterized by adjusting depth.