JPH02123509A - Magnetic head manufacturing method - Google Patents

Abstract

PURPOSE:To manufacture a magnetic head with good yield by providing a V groove to the magnetic gap surface of one side or both sides of a pair of magnetic cores which constitute a dual type magnetic head, and forming the magnetic gap at the slanting surface part of the V groove. CONSTITUTION:V grooves 2A and 2B are processed at an equal interval on the magnetic gap surface of a pair of magnetic bodies 1A and 1B of a magnetic core to provide an azimuth. Next, winding grooves 4A and 4B and a track width control groove are processed and to the magnetic gap surface of a pair of magnetic bodies 1A and 1B, a high softening point glass is sputtered with the thickness of 1/2 of the magnetic gap length, respectively. The magnetic gap surface of the pair of the magnetic bodies is joined, bonded by a glass 5 and a magnetic core is obtained. On the other hand, the magnetic core to which the azimuth is not provided is formed and combined with the magnetic core to which the azimuth is provided. Then, the glass of the flow softening point is sputtered and joined with the joining surface of the magnetic cores 1A and 1B. Next, cutting is carried out by a cutting part 6 and after cutting, a dual type head chip 7 is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a magnetic head, and particularly to a method of manufacturing a dual-type magnetic head in which an appropriate azimuth is easily set between one magnetic gap and the other magnetic gap. It is about the method.

[Summary of the invention]

Conventionally, when manufacturing dual-type magnetic heads.

When attempting to provide azimuth between head gaps, there are problems such as poor yield of magnetic material or poor workability.

The present invention provides a V-groove in one gap abutting surface of a pair of magnetic core blocks constituting at least one magnetic gap, and after forming the other in a shape to fit into this V-groove, the pair of magnetic core blocks The blocks are bonded to form a magnetic gap of the slope portion type of each of the V grooves.

According to the present invention, a dual-type magnetic head can be efficiently manufactured with high yield.

[Conventional technology]

Dual magnetic heads are used in VTRs that use multiple magnetic heads in one cylinder, for example.

It is used to improve tape running by reducing the portion occupied by the magnetic head relative to the cylinder diameter.

Conventionally, the following method has been used to reduce crossfeed in this dual type magnetic head. ■ Increase the distance between both magnetic gaps 0 ■ Interpose a magnetic shielding material such as permalloy by sputtering or the like on the non-magnetic part that joins both magnetic cores.

However, both methods ■■ are unsatisfactory in sufficiently reducing crossfeed, and method ■
When used in R, the cylinder becomes smaller, which goes against the technical requirement that the head must be made smaller. ■
Even with this method, the manufacturing method is complicated because magnetic and non-magnetic materials must be sputtered alternately. Therefore, it is possible to reduce cross-feed by creating an azimuth in the mutual magnetic gap.
(a) Setting and cutting at an appropriate angle during cutting requires changing the cutting angle at the non-magnetic portion that joins the two magnetic cores, which is impossible in actual manufacturing. (b) Providing the azimuth by forming the magnetic gap length after polishing the magnetic gap surface at an appropriate angle is not practical because the yield of magnetic material will be extremely poor. If we were to use a magnetic core of 30 mm and provide an azimuth of 6 mm, we would have to grind or cut off the magnetic 1 mm thick part of 30 x tan 6 degrees = 3.15 mm and discard it. (
c) Also, forming a pair of magnetic cores and joining them with a non-magnetic material results in extremely poor workability and the surfaces to be joined are small, making it difficult to maintain positional accuracy for both gap lengths. be.

[Problem to be solved by the invention]

As mentioned above, if we try to provide an azimuth between the magnetic gaps in a dual-type magnetic head,
There were problems such as poor yield of magnetic materials and poor workability.

SUMMARY OF THE INVENTION The present invention aims to solve these problems and provide a method for manufacturing a magnetic head in which azimuth is efficiently provided in one magnetic gap with respect to the other magnetic gap with a high material yield. be.

[Failure to solve the problem]

In order to achieve the above purpose, V grooves are continuously provided on the magnetic gear knob surface of one or both magnetic core blocks,
This V-groove has one oblique side portion type magnetic gap surface.

[Effect]

As a result, it becomes possible to make the mutual magnetic gaps have the same azimuth with good workability without using the above-mentioned conventional method.

〔Example〕

Hereinafter, nine embodiments of the present invention will be explained with reference to FIGS. 1 to 3. IA and IB are magnetic materials, 2 is a magnetic gap, 3 is an interface between magnetic materials that are not magnetic gaps, 4 is a winding groove, and 5 is a pair of magnetic cores joined to form a dual magnetic head structure. 6 indicates the cut portion, and 7 indicates the remaining portion after cutting. In this embodiment, a track width control groove is provided on one magnetic core to determine the track width, and the thickness of the other magnetic core is equal to the track width in the case of a dual type magnetic head, and the azimuth is provided only on one magnetic core. Let me explain the case.

First, as shown in Figure 1, one of the magnetic cores with an azimuth
V-grooves are machined at equal intervals on the magnetic gap surfaces of the pair of magnetic bodies using a wire saw or the like. At this time, the pitch at which the V-grooves are to be formed is determined by considering the width of the cutting blade. Also, the depth direction of the groove is determined so as to give the desired trunk width. Next, after machining 2 winding grooves and track width control grooves, V grooves were machined on the magnetic gap surfaces of the pair of magnetic bodies, respectively.

High softening point glass is sputtered to a thickness that is 1/2 of the desired magnetic gap length. At this time, one inclined portion of the groove (1) is masked to prevent high softening point glass from being sputtered. The magnetic gap surfaces of this pair of magnetic bodies are joined and glass bonded by a known method to obtain a second magnetic core. On the other hand, a non-azimuthed magnetic core is formed by known methods and combined with an azimuthaled magnetic core. At this time, glass with a softening point lower than that of the glass sputtered to form the above-mentioned magnetic gap is sputtered onto the surfaces to which the pair of magnetic cores are to be joined, and glass with a softening point lower than that of the high softening point glass is sputtered. , Glass bonding is performed at a temperature higher than the softening point of low softening point glass. Thereafter, by cutting the portion shown in FIG. 36 with a dicer or the like, the cutter 7 is taken out to obtain the intended dual head chip. By bonding this dual type head chip with epoxy resin etc. to the base and applying the prescribed winding, the desired dual type magnetic head can be obtained.If track width control grooves are provided on both sides, the desired dual type magnetic head can be obtained using the same manufacturing method. It is possible to obtain a mold head. Further, in the case of a dual-type head in which azimuth is provided on both sides, it can be manufactured in the same manner as in the above-mentioned embodiment by forming V-grooves on both magnetic bodies. The method for manufacturing a dual-type magnetic head using four magnetic bodies has been described above, but in the case of a dual-type magnetic head in which three magnetic bodies share the central magnetic body, the shared magnetic Since the opposite surfaces of the body become the respective magnetic gap surfaces, if V-grooves are formed on both surfaces, it can be manufactured by almost the same method as described above.

This occurs when using this invention. The air gap that occurs at the interface between magnetic materials that is not a magnetic gap has an azimuth that does not cause any problems with the characteristics of either of the two magnetic gaps that make up the dual type head, so it does not cause any deterioration of the characteristics. is not connected.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to efficiently produce a compact Tuual type magnet with reduced cross-feed.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention. FIG. 1 is a perspective view of a pair of magnetic bodies provided with a V-groove for providing azimuth, and FIG. 2 is a perspective view of the magnetic core provided with azimuth after glass bonding. FIG. 3 is a perspective view of the dual magnetic core before cutting. IA, IB: magnetic material, 2A, 2B: magnetic gap, 3
: Boundary surface between magnetic materials, 4A, 4B: Winding groove, 5: Non-magnetic material (low softening point glass), 6: Cut portion. n)

Claims (1)

[Claims] In a dual-type magnetic head having one or two magnetic gaps, a V-groove is provided on the magnetic gap surface of one or both of the pair of magnetic cores constituting the dual-type magnetic head, and the V-groove is 1. A method of manufacturing a magnetic head, characterized in that a magnetic gap is formed at a sloped portion so that an azimuth is formed between the magnetic gaps.