JPS61260408A - Track working method for magnetic head - Google Patents

Abstract

PURPOSE:To eliminate the variance of effective track width and to improve the magnetic characteristic of a magnetic head by using the heat removing working with a laser beam to form track forming holes after a gapped bar for recording and reproducing is formed. CONSTITUTION:A pair of magnetic materials 3a and 3b consisting of a ferrite of high permeability are provided, and a winding groove 4 is worked on one magnetic material 3a. Magnetic materials 5 whose saturation magnetic flux density is higher than that of the ferrite are adhered to side faces of magnetic materials 3a and 3b, and magnetic materials 3a and 3b are joined with a nonmagnetic material between them to form a gapped bar 6 for recording and reproducing. The upper face of the gapped bar 6 for recording and reproducing is finished to a smooth surface, and track forming holes 2 are formed on magnetic materials 3a and 3b across the junction part by a laser beam 1. Thus, the peeling of magnetic materials of high saturation magnetic flux density is prevented and the difference of track width is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a track processing method for a magnetic recording head for a video tape recorder.

2. Description of the Related Art A conventional method for manufacturing a magnetic head for a video tape recorder is as shown in FIG.
After depositing a magnetic material 11 having a higher saturation magnetic flux density than the ferrite on the side surface of the ferrite block 10a, as shown in FIG.
A predetermined number of cutting grooves 12 are formed in parallel using a diamond grindstone, and then two ferrite blocks 10a are formed as shown in FIG.

10b so that the cuts 1112 are aligned, and are joined by an ultra-thin glass film (not shown) made of a non-magnetic material,
A recording/reproducing gap bar 13 is formed.

The upper surface of the cast hole 13 is precisely machined, and the holes for forming tracks are filled with glass. Next, as shown by cutting@14 in FIG. 10, cutting is performed at the cutting groove 12 portion, and then the side surfaces are precisely finished to obtain the magnetic recording head shown in FIG. 11.

Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) When forming the cutting groove, the ferrite block 10a
, the magnetic material 11, which has a saturation magnetic flux density higher than that of ferrite, is partially peeled off from 10b, resulting in deterioration of magnetic properties.

(2>211) When joining the I-light blocks 10a and 10b through the film glass, if the relative positions of the cutting grooves shift, the track width will be reduced by the amount of passage d, as shown in Fig. 12. However, the magnetic properties deteriorate.

The present invention solves the problems described above, and provides a method for processing a magnetic head that does not cause peeling of a magnetic material with a high saturation magnetic flux density and also does not cause discrepancies in track width.

Means for Solving the Problems In order to solve the above-mentioned problems, the magnetic head processing method of the present invention includes a pair of ferrites having a magnetic layer having a higher saturation magnetic flux density than ferrite formed on the side surface. forming a recording/reproducing type gap door by joining the magnetic layers facing each other and interposing a non-magnetic material between the facing magnetic layers;
Thereafter, holes for track formation are formed using a laser beam.

Effect of the Invention With the above-described configuration, the present invention uses heat removal processing using a laser beam instead of forming track forming holes by machining using a conventional diamond grindstone. This solves the problem of peeling off during processing, and
Since the track forming holes are formed after forming the recording and reproducing capped holes, the problem that a discrepancy in track width occurs is solved.

EXAMPLE An example of the present invention will be described below based on the drawings. Second
The figure shows a pair of magnetic materials 3a and 3b each made of high magnetic permeability ferrite, and one of the magnetic materials 3a is provided with a winding groove 4.

As shown in FIG. 3, both of these magnetic materials 3a and 3b are coated with a magnetic material 5 having a higher saturation magnetic flux density than ferrite on the side surface.
After this is deposited, they are joined via a non-magnetic material (not shown) to form the recording/reproducing gap bar 6. After the upper surface of the recording/reproducing gap bar 〇 is finished to a smooth surface, a laser beam 1 is used to form a track at the bonded portion across both magnetic materials 3a and 3b, as shown in FIG. A hole 2 is formed. As the device for generating the laser beam 1, it is preferable to use a neodymium YAG laser device, but the device is not limited thereto. Next, as shown in FIG. 4, after filling the track forming hole 2 with glass 7, the upper surface 9 is precisely machined, and the glass 7 is cut across the track forming hole 2 as shown by the cutting line 8 in FIG. After cutting and dividing, the cut surfaces are precisely finished to form the recording/reproducing magnetic head shown in FIG. 6.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, in the above embodiment, the hole for forming the track is circular, but the present invention using a laser beam makes it possible to relatively freely define the shape of the hole, such as an ellipse or a rectangle. .

Effects of the Invention With the above configuration, the present invention can achieve the following effects.

(1) Since the track forming holes are formed by a laser configuration after the recording and reproducing gap bars are formed, it is possible to eliminate the variation in effective track width that was a problem in the conventional example, and as a result, the magnetic head Magnetic properties can be improved.

(2) When forming holes for track formation, the peeling of the magnetic material, which has a higher saturation magnetic flux density than ferrite, which was a problem with conventional processing using a diamond grinding wheel, was resolved by using laser beam processing. As a result, a high quality product is obtained.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a diagram showing a hole for track formation being processed by a laser beam, Fig. 2 is a perspective view of a ferrite block constituting the magnetic head of the present invention, and Fig. 3 is a diagram showing the ferrite block forming the magnetic head of the present invention. A perspective view of a gapped bar formed by bonding blocks together via a non-magnetic material, FIG. 4 is a diagram showing how glass is filled into the formed track forming hole, and FIG. 5 is a diagram showing cutting of the gapped bar. , FIG. 6 is a perspective view of the magnetic head, FIGS. 7 to 11 are diagrams showing the reporting process of a conventional magnetic recording head, and FIG. 12 shows the loss d in effective track width due to track alignment deviation. It is a diagram. 1... Laser beam, 2... Track forming hole, 3a
. 3b... Ferrite block, 5... Magnetic material with higher saturation magnetic flux density than ferrite, 6... Gap dopa agent Yoshihiro Morimoto Figure 4 Figure 6 Figure 7 Figure 1 ρ Figure 12

Claims (1)

[Claims] 1. A magnetic layer having a higher saturation magnetic flux density than the ferrite is formed on the side surface of a ferrite block made of high magnetic permeability ferrite, and a pair of the ferrite blocks are arranged such that the magnetic layers having a higher saturation magnetic flux density than the ferrite face each other, and A magnetic head in which a non-magnetic material is interposed between the opposing magnetic layers having a high saturation magnetic flux density and bonded to form a recording/reproducing gap bar, and then a laser beam is used to form a track forming hole. Track processing method.