JPS6143766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a head core block that is integrally joined, one of which has a plurality of grooves regulating the track width, and the other of which has a width dimension larger than the track width. The present invention relates to a method of manufacturing a magnetic head in which a magnetic gap is formed efficiently and with a high yield by forming a plurality of grooves.

One of the conventional gap forming methods of this type is shown in FIG. Figures 1a and b are perspective views of the magnetic substrates (hereinafter referred to as head core block halves) before bonding, Figure 1c is a perspective view of the head core block in the bonded state, and Figure 1d is after bonding. FIG. 3 is a partially enlarged view showing the state of track deviation. In these figures, 1a and 1b are head core block halves made of magnetic material such as ferrite, and track portions 2a and 2b are grooved to have the desired track width as shown in FIGS. 1a and 1b, respectively. A non-magnetic material having high wear resistance, such as glass 3a and 3b, is molded into the groove. Furthermore, as shown in FIG. 1a, one half of the head core block 1a is machined with a winding window 4 and a groove 5 for installing a bonding material, and a cap spacer 6 made of Ni, Cr, SiO2, etc. ₂ etc. is deposited to the desired thickness. As shown in FIG. 1c, a bonding material, for example, a glass 7a having a lower melting point than the glasses 3a and 3b, is molded into the winding window 4 and the groove 5.
7b, melt it and infiltrate between the gaps, and attach the two head core block halves 1a and 1b.
were joined to form a magnetic gap.

However, in the conventional method as described above, the track widths of the head core block halves 1a and 1b are set to be the same.
Due to the accuracy of the equipment used, variations in processing conditions, etc., errors may occur in the track width and groove pitch that are actually finished. The track portions 2a and 2b may be misaligned, and the desired track width may not be obtained, resulting in disadvantages such as poor yield and difficulty in aligning the tracks.

This invention was made in order to eliminate the above-mentioned drawbacks of the prior art.When machining a track, one half of the head core block regulates the track width, and the other half of the head core block has a track width. The purpose of the present invention is to provide a manufacturing method that can form a gap efficiently and with a high yield by making the width a width that gives a margin in consideration of accuracy, that is, making it wide. This invention will be explained below.

Figures 2a, b, and c show one embodiment of the present invention. Figure 2a is a perspective view showing the state in which the headblock halves are joined, and Figures 2b and c show the state of track deviation. FIG. 2b shows the normal state, and FIG. 2c shows the target state when the maximum deviation occurs. In these figures, the same reference numerals as in Fig. 1 indicate the same parts, and 2
c and 2d are the headblock halves 1, respectively.
This is the track portion of a and 1b.

According to the above configuration, the headblock half 1a
The track width dimension that regulates the width of the track portion 2c
By finishing the width of the track portion 2d of the other headblock half 1b at Tw ₁ to a wide dimension Tw ₂ in consideration of accuracy, the track portion 2c, that is, the effective track portion, is increased as shown in FIGS. 2b and 2c. The gap is secured without protruding from the track portion 2d, that is, the mating track portion, and a gap can be easily formed with a high yield. By selecting the track width dimension Tw ₂ , it is possible to achieve the state shown in Fig. 2 b, but if you want to keep the difference between both tracks (Tw ₂ − Tw ₁ ) as small as possible, the state shown in Fig. 2 c It is also possible to process by setting the condition to be the worst condition.

As explained above, this invention has a margin in the groove pitch accuracy of each half of the headblock.
Track alignment becomes easier when forming gaps,
There is an advantage that magnetic heads can be manufactured efficiently and with high yield.

[Brief explanation of the drawing]

Figures 1a and b are perspective views showing the head core block halves before joining during conventional gap formation, Figure 1c is a perspective view showing the state of both headblock halves being joined, and Figure 1d. are partially enlarged views showing the state of track deviation after joining, Figure 2a,
b and c show one embodiment of this invention, and the second
Figure a is a perspective view showing the state in which both headblock halves are joined, and Figures 2b and 2c are partially enlarged views showing the state of displacement of the tracks after joining. In the figure, 1a and 1b are head core block halves,
2c and 2d are track parts, 3a and 3b are glass,
4 is a winding window, 5 is a groove for installing a binding material, 6 is a gear spacer, 7a and 7b are glass, Tw ₁ , Tw ₂
is the track width dimension. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A plurality of grooves are provided on one of the two magnetic substrates, and the track width between the grooves is processed to a predetermined value, and a plurality of grooves are similarly provided on the other of the two magnetic substrates, and the track width between the grooves is processed to a predetermined value. A method for manufacturing a magnetic head, characterized in that a magnetic gap is formed by machining the track width to be larger than the track width provided on the magnetic base and integrally joining both of the magnetic bases through a gap material.