JPS62117116A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To eliminate noise by fixing respective magnetic core parts at regular intervals on a nonmagnetic supporting member and effectively preventing the leakage of a magnetic flux between the core parts. CONSTITUTION:Magnetic core materials 21a and 21b are fused by glass 20 to form a magnetic core (magnetic core part) 21 having a magnetic gap 27, and the plural magnetic core parts are fused to one another by glass 28 on the common nonmagnetic substrate 22. Ceramics such as crystallized glass and steatite, metals such as Cu, Ti, and C, etc., having a low permeability can be used as the common magnetic substrate 22. Since the core parts 21 are fixed on the nonmagnetic substrate 22 at regular intervals, the leakage of a magnetic flux (crosstalk) between the parts can be effectively prevented. Consequently, noise is reduced, and a clear voice, etc., can be recorded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head and a method of manufacturing the same.

BACKGROUND OF THE INVENTION Conventionally, multi-track magnetic heads, which are formed by coupling a plurality of magnetic core sections each having a magnetic gap at predetermined track intervals, have been known and put into practical use for audio applications and the like. In this case, it is desirable to reduce the track spacing, but such processing is difficult and at the same time crosstalk (signals from one core side leaking to the other core side) is likely to occur. I end up.

For example, J.C.Malison (J.C.Mal)
1 Design Philosophy and Facility on a 750 Mbit Per Second Magnetic Recording (Des.
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The magnetic head described in N15 (September 1978) is the fifth
As shown in the figure. According to this head, grooves 3 and 4 are cut in the block-shaped magnetic cores 1 and 2 (FIG. 5A),
A head is created by applying a winding 5 to one of the magnetic cores 2 and fusing them together with a glass 8. Then, as shown in FIG. 5B, a multi-track head is constructed by inserting a molded glass 6 between the tracks for reinforcement, and further polishing the tape sliding surface side into a predetermined shape so that each magnetic gap 7 is exposed to the polished surface. Finish it.

However, in this head, part 2 of the rear core 2
a was common to each core, causing crosstalk and making it impossible to obtain clear images and sounds.

Also, "Fixed Head 2 PCM Recorder" written by Kunii.

Television Society, Recording Study Group Material VR25-1 (19
77-9), in order to prevent the above-mentioned disadvantage of crosstalk, each core 11.
A multi-magnetic head is created by individually manufacturing 12 and bonding them together with an adhesive 16 such as a glass fusing agent. In the figure, 17 is each magnetic gap, 15 is a winding coil, and 18 is a fused glass.

However, in this conventional technology, the head gap 17 aligned inline causes the gap position to shift due to the explosion problem, resulting in a shift in the readout response speed and screen shift, etc., making it impossible to obtain clear images and sounds. Ta.

C1 Purpose of the Invention The purpose of the present invention is to eliminate noise caused by crosstalk and disturbance of images caused by positional deviation of gaps.
The purpose is to obtain clear images and sounds.

20 Structure of the invention, that is, the present invention includes a support member having substantially no magnetism;
The present invention relates to a magnetic head having a plurality of magnetic core portions arranged on the support member at predetermined intervals.

The present invention also provides a method for manufacturing a magnetic head, in which a magnetic material is fixed on a support member, and then predetermined portions of the magnetic material are removed to form a plurality of magnetic core portions separated from each other. A method is also provided.

E. EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 4.

1 and 2 show an example of an audio multi-track magnetic head. According to this head, a magnetic core (magnetic core portion) B having a magnetic cap n is formed by fusing magnetic core materials 21a and 21b with glass 20, and a plurality of magnetic core portions (in the illustrated example, two magnetic core portions are formed). ) A common non-magnetic substrate 22J: is fused with glass 28. A winding coil 25 is attached to each magnetic core part 21 through the winding hole 21, and this winding coil 25 is made of a printed coil printed on a flexible substrate 30. 24, and its end is bonded by a wire 31 to a wiring 35 on another board 54 with terminals 32, 33 in a straddle type. Moreover, between each magnetic core part 21, there is a separation groove between the substrates 2 and 21.
2, and this separation groove 34 is filled with a reinforcing material 26 made of resin such as glass, epoxy, or polyimide for reinforcement. The width of this separation groove 34 corresponds to the track interval that determines the track width of each magnetic gap 27, and is, for example, about 40 μm.

Further, the magnetic core portion 4 is made of a magnetic material (for example, Mn-Zn
It is made of single crystal ferrite, NtZn single crystal ferrite, sintered Mn-Zn ferrite, etc., or a soft magnetic thin film of sendust, permalloy, magnetic amorphous, etc.). On the other hand, the common non-magnetic substrate 22 is made of ceramics such as crystallized glass, stearite, etc.
Any material having a low dielectric constant, including metals such as Cu, Ti, and Cr, may be used.

In the multi-track magnetic head configured as described above, each magnetic core section 21 is fixed on a common non-magnetic substrate 22 at a predetermined interval, so that magnetic flux leakage (crosstalk) between them can be effectively prevented. can be prevented.

Therefore, noise can be eliminated and clear audio can be recorded/reproduced.

Moreover, each magnetic core part 21 is not individually fixed on the substrate 22, but can be cut out from one core material by the method described later, so that each gap 27 can be arranged in-line without positional deviation. This also contributes to improved recording/playback characteristics (clear images, audio).

FIG. 3 shows another example of a multi-track magnetic head. According to this head, in order to sufficiently prevent leakage of magnetic flux between each magnetic core part 21, each magnetic core part 21
A layer 40 that sufficiently shields magnetic flux is interposed between the common nonmagnetic substrate 22 and the common nonmagnetic substrate 22 .

This layer 40 is made of, for example, fused glass on the substrate 22 thickly (
1 μm or more).

Further, since the shielding layer 40 is provided, the substrate 22 does not necessarily have to be non-magnetic, and can also be formed of a magnetic material.

Next, a method of manufacturing the head according to this example, for example, the head of the first cause, will be explained with reference to FIG.

First, as shown in FIG. 4A, for example, a single-crystal ferrite block 41 is prepared, and after lapping this block, grooves 44 for general winding purposes are processed by a known method as shown in FIG. 4B.

Next, as shown in FIG. 4C, sendust,
A soft magnetic material 42, such as permalloy or amorphous magnetic material, is deposited by sputtering to a thickness of approximately 2 μm. This sputtering may be performed on both blocks. Furthermore, a magnetic gap (the above-mentioned 27
) Sputter the S io 1 film to a thickness of 0.3 μm to determine the length.

Then, as shown in FIG. 4D, both blocks 41 are bonded together by glass fusing.

Next, as shown in FIGS. 4E and 4F, a non-magnetic substrate 22 (for example, ceramics) is attached to the back surface of the core material 41.
The tsuba is fused. The ceramic used is preferably stearite, which has a coefficient of thermal expansion similar to that of ferrite.

Next, the position shown by one point @ line 43 in Fig. 4F is cut in width μm.
Groove cutting is performed with a diamond cutter or laser cutter over the course of time to form track separation grooves 34 as shown in FIG. 4G.

In the process shown in FIG. 4G, each magnetic core portion 2 is placed on the non-magnetic substrate 22.
1 is separated and fixed to form the original shape of a multi-track type head. However, the separation groove 34 needs to be formed so that at least the magnetic core part 21 is completely cut off, and it is sufficient that it reaches the substrate 22 as shown in the figure.

Next, as shown in FIG. 4H, the flexible substrate 30 with the printed coil 25 is wound through the winding hole 24, and the substrate 54 with the other wiring 35 is attached and wire bonded as described above. Furthermore, resin reinforcing agent 2 is added to the groove.
Pour 6 and let it stick.

Next, the tape sliding surface side is polished so as to have the shape shown in FIG. 1, and the head is completed.

If the head is created in this way, each magnetic core part 4 can be cut out from the block 4 on the common substrate 22, so each magnetic gap 27 can be arranged in-line with high positional accuracy. Moreover, manufacturing of the head becomes easy.

Although the present invention has been described above, the embodiments described above can be further modified based on the technical idea of the present invention.

For example, in order to prevent the substrate from having magnetism, in addition to the above-mentioned examples, it is possible to attach a non-magnetic material to the surface, or to apply a non-magnetic material or adhesive to a sufficient thickness on the core material block side. It can also be glued to. In this specification, the term "substantially non-magnetic support member" includes the above-described substrate or adhesive structure. Moreover, the number of magnetic core parts is not limited to the above-mentioned example, and three or more may be arranged. Further, the cutting method, shape, etc. of each magnetic core portion can be variously changed. The winding coil may also be a conductive wire with a very small diameter, such as a formal conductive wire.

Effects of the Invention As described above, in the present invention, each magnetic core part is fixed at a predetermined interval on a substantially non-magnetic support member, so that there is no leakage of magnetic flux between them (crosstalk). It is possible to effectively prevent noise, eliminate noise, and record/play back clear audio. Moreover, since each magnetic core part is formed by removing a predetermined part of the magnetic material fixed on the support member, each gap can be arranged in-line without positional deviation, which also has recording/reproduction characteristics. (clear images and sounds).

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention, in which FIG. 1 is a perspective view of a multi-track magnetic head, FIG. 2 is a perspective view showing each part of FIG. 1 separated, and FIG. 3 is a perspective view of another example of a multi-track magnetic head, FIG. 4A, FIG. 4B, FIG. 4C, FIG. 4D, FIG. 4E,
FIG. 4F, FIG. 4G, and FIG. 4H are perspective views showing the method of manufacturing a multi-track magnetic head in the order of steps. Port Figures 5 and 6 show conventional examples, and Port 5A
5A and 5B are perspective views showing the main steps in manufacturing a multi-track magnetic head, and FIG. 6 is a perspective view of another multi-track magnetic head. In addition, in the symbols shown in the drawings, 21......Magnetic core portion 22...
......Non-magnetic substrate 25.35...7 Coil 26...Reinforcement material 27...Magnetic Gap 34...
...... Track separation groove 40...
. . . Shielding layer 41 . . . Magnetic material block 43 . . . It is a soft magnetic material. Agent: Hiroshi Aisaka, Patent Attorney Figure 1, Figure 3, Figure 4C (self-motivated) Procedural Report, November q, 1988 Patent Office District Officer, Kuro 1) Akio Tono 1, Indication of the Case, 1985 Patent Application No. 258839 2, Title of the invention: Magnetic head and its manufacturing method 3, Relationship with the amended person case Patent applicant address: 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name:
(127) Konishiroku Photo Industry Co., Ltd. 4, Agent address: 2-4-11 Shibasaki-cho, Tachikawa-shi, Tokyo FINE Building Equipment O425-24-5411tlt56, Number of inventions increased by amendment 7, Target of amendment 7 patents ″′□・

Claims (1)

[Scope of Claims] 1. A magnetic head having a support member having substantially no magnetism and a plurality of magnetic core portions arranged at predetermined intervals on the support member. 2. A method for manufacturing a magnetic head, in which a magnetic material is fixed on a support member, and then predetermined portions of the magnetic material are removed to form a plurality of magnetic core portions separated from each other.