JPH0546002B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a head assembly for a magnetic head, and particularly in a head assembly in which a head core is interposed between a plurality of supports, the attachment of a terminal plate to the head assembly is This invention relates to a head assembly configured to also serve as reinforcement.

<Prior Art> Magnetic heads made of sintered oxide magnetic materials such as ferrite have been widely used for recording, reproduction, and erasing in video tape recorders, cassette tape recorders, and the like.

This magnetic head is known, for example, from Japanese Patent Publication No. 53-2042,
Special Publication No. 54-12813, Special Publication No. 54-6884, Special Publication No.
They are manufactured by various methods such as those described in Japanese Patent Publication No. 51-29403, Japanese Patent Publication No. 54-8088, Japanese Patent Publication No. 50-14900, etc.

On the other hand, as computer-related equipment, preliminary recording is performed on magnetic tape in a backup device called a streamer in order to avoid the risk of loss of recorded data on fixed disks. For example, this backup device is 1/2
It enables high-density recording of 24 tracks on an inch-wide magnetic tape, with write/read/
The magnetic head, which has a write, 2-channel, and 6-gaps configuration, is moved step by step using a head up-and-down mechanism, and the magnetic tape is automatically transported in reverse at high speed (2 m/sec) to back up recorded data. . Such a magnetic head consists of a plurality of head assemblies mounted on a base block.

<Problems to be Solved by the Invention> However, such a head assembly is a composite body in which a plurality of wire-wound head cores and supports made of magnetic material are alternately laminated, but the parts are simply bonded with resin or the like. Therefore, it was difficult to obtain sufficient strength.

<Means for Solving the Problems> Therefore, the present invention was created to solve the problems in the prior art, and includes:
The purpose is to provide a reinforced head assembly.

The object of the present invention is to provide a wire-wound head core that has one or more wire-wound head cores, two or more supports that support the wire-wound head cores, and has a predetermined pattern connected to the wire-wound head cores, and that at least one of the plurality of supports is connected to the wire-wound head cores. This is achieved by a head assembly characterized in that it comprises a terminal plate that is attached to straddle the supports at both ends so as to integrate the supports at both ends.

<Function> According to the present invention as described above, the connection between the head core and the support body is strengthened by the terminal plate, and a sufficiently reinforced and integrated head assembly can be obtained.

<Example> Hereinafter, the manufacturing process of a magnetic head according to an example of the present invention will be explained in order with reference to the drawings.
Although the following embodiments describe a magnetic head having a ring core and a head assembly used in the computer backup device described above, the present invention is not limited thereto, and may be applied to other types of magnetic heads. It should be noted that the present invention is also applicable to magnetic heads used in magnetic heads and other applications.

FIG. 1 shows a long L-side ferrite block material 1 in which recesses 8, 8 and track grooves 9 for winding are cut, and a gap material 13 made of a glass material containing _SiO2 as a main component. A head block 18 is shown in which a long R-side ferrite block material 10, which is adhered to the head and has similarly cut recesses 20, 20 for the winding wire, is integrated by means of molten glass materials 15, 16. There is. 17 is a winding window formed in the head block 18 by the winding recesses 8, 20 of the two ferrite blocks 1, 10 on opposite sides. Since this headblock 18 can be manufactured by the conventional method described above, it will not be described in detail.

The head block 18 is then cut at the center of the track groove 9, as shown by the dotted lines in FIG. 1, to cut out a plurality of ring cores 21. In addition, a plurality of ring cores 21 are connected to the head block 18.
After cutting out, the parts at both ends are discarded because they do not have the specified dimensions.

Each of the ring cores 21 thus obtained has a shape and structure as shown in FIG.
As shown in FIG. 2, the inclined groove 14 is filled with a glass material 15, and the track groove 9 and part of the winding groove 17 are filled with a glass material 16. Also, Figure 1 B-
The cross section along line B is as shown in Figure 2B,
The difference is that the glass material 16 is filled only in a part of the winding window 17 since the track groove 9 is not present in this part. FIG. 2C shows a top view of the ring core 21. FIG.

Next, as shown in FIG. 3, this ring core 21
between the winding recesses 8 and 8 and between 20 and 20,
Windings 22, 22 are applied, respectively. In the illustrated embodiment, the winding is wound 30 times on each side of the ring core 21 to form a read head, but in the case of a write head, a winding recess 8 or a winding formed only on one side is used.
20 and the winding window 17, for example, two wires can be bundled and wound 10 times.

In this way, a two-channel head assembly 23 is formed using two ring cores 21 each having a winding 22 applied thereto. As shown in FIG. 4, grooves 24a, 25a, 26a for terminal plates and recesses 24b, 25b, 26b for winding escape are formed, respectively, and epoxy resin is used on the contact surfaces with ring cores 21, 21. Holders 24, 25, 2 made of ferrite material coated with a thin layer (not shown) of
6, sandwich the ring core 21 between each holder and press them together, and in this state, heat it in an electric furnace at 130℃ for 1
By heating for a period of time, an integrated head assembly 23 is obtained.

Next, referring to FIG.
One end of the terminal plate 27 is fitted into 5a, 26a and fixed with epoxy resin 28. By attaching the terminal plate 27 in this manner, the head assembly 23, which is a composite body, is sufficiently reinforced and firmly integrated. A predetermined pattern 27a is formed on the terminal plate 27, and the windings 22 of each ring core 21 are soldered and wired to the terminals of the predetermined pattern 27a.

The head assembly 23 is then assembled as shown in FIG.
It is ground by a grinding wheel 29 to a predetermined shape and to a predetermined gap depth. Thereafter, wrapping is performed for temporary finishing using wrapping tape (not shown), and the two-channel head assembly 23 with a mirror finish is completed.

At this point, the completed head assembly 23 can be subjected to an operation check such as a continuity test. That is, according to this embodiment, it is possible to check the operation in the intermediate process of manufacturing the magnetic head.
Product yield is significantly improved.

The base block 30 of the magnetic head is made of aluminum die-casting, for example, and is processed into the shape shown in FIG. In the figure, A is a front view of the base block 30, B is a rear view thereof, C is a bottom view thereof, and D is a left side view thereof. Note that the plan view is the same as the other bottom view without screw holes, and the right side view is symmetrical with the left side view, so these drawings are omitted. In this embodiment, a so-called write/read/write type magnetic head is manufactured using two write head assemblies and one read head assembly as the head assembly 23 completed through the steps up to FIG. Therefore, this base block 30 includes a first write head assembly mounting base 31 and a first read head assembly mounting base 3.
2 and second write head assembly mounting base 33
As is clear from the bottom view of FIG. is positioned at a level higher than that by a certain distance h. Moreover, 31a, 32a, and 33a are reference planes that are parallel to each other and are used as references when mounting the respective head assemblies. The meaning of this will become clear from what will be described later.

A through window 32b is formed in the center of the reading head assembly mounting base 32, and recesses 31b and 33b are formed in the first and second writing head assembly mounting stages 31 and 33 on both sides, respectively, so that the head assembly 22 can be mounted on these. When the terminal plate 26 is placed on the mounting table, the terminal plate 26 is connected to these openings 31b and 32.
b, 33b. In the figure, 44 is a screw hole for attaching the base block 30 to related equipment (not shown), 34 is a step for attaching a side shield plate, and 35 is a step for attaching a bottom shield plate.

Similar to FIG. 7, FIG. 8 shows a state in which each head assembly is attached to the base block 30 having such a shape, and a seal plate is attached and fixed to each head assembly. Each head assembly is basically similar to head assembly 23 shown in FIG. 6, and is a two-channel head assembly having two ring cores. More specifically, the read head assembly 37 is identical to the head assembly 23 shown in FIG. and a second write head assembly 38, two ring cores 36a, 38 as previously described.
The windings 36b and 38b are provided only on one side of the wire a. Windings 36 in these first and second write head assemblies 36, 38
b, 38b are formed on the side opposite the read head assembly 37. This prevents crossfeeding (signal jumping from the write head to the read head).

These head assemblies 36, 37, 38 are mounted on respective mounting tables 3 in the base block 30.
1, 32, 33 using an appropriate adhesive, but at that time, the respective reference surfaces 31a, 3
2a and 33a for accurate positioning. As a result, the parallel relationship between the head assemblies 36, 37, and 38 is not impaired, and azimuth loss does not occur.

On each side of each head assembly 36, 37, 38 accurately positioned in this way,
Shield blocks 39a, 39b; 40 made of ferrite material, which is the same material as the head assembly.
a, 40b; 41a, 41b are bonded and fixed with an appropriate adhesive. At this time, as is clear from FIGS. 8A and 8C, the shield block 39
The shape and dimensions of each shield block are determined so that caps 42 and 43 are formed between b and 40a and between 40b and 41a, respectively. Therefore, the shielding characteristics are further improved through the air layer in the gaps 42 and 43.
Also, shield blocks 39a, 40a, 40b,
Recesses 39c, 40c, 41c are formed in the shield blocks 39a, 41b for allowing the windings 36b, 37b, 38b of the corresponding head assemblies to escape, and side ends formed in the shield blocks 39a, 41b are formed in the shield blocks 39a, 41b. The convex portions 39d and 41d are temporarily wrapped with a wrapping tape (not shown) to give a mirror-like finish.

In the figure, 36c, 37c, and 38c are terminal plates attached to each head assembly 36, 37, and 38, and are visible through openings 31b, 32b, and 33b, respectively. Also 36d, 37
d and 38d are terminal plate mounting grooves formed at the bottom of each head assembly.

As shown in FIG. 8C, the magnetic head in this embodiment has a side end protrusion 39 of a seal block 39a.
d, a convex portion 36e approximately centered on the gap of the ring core 36a of the first write head assembly 36;
A convex portion 37e approximately centered on the gap of the ring core 37a of the read head assembly 37, a convex portion 38e approximately centered on the gap of the ring core 38a of the second write head assembly 38, and a seal plate 41.
It is configured to come into sliding contact with the magnetic recording/reproducing tape T at five locations on the side end convex portion 41d of b. After this,
To ensure smooth sliding contact between the entire magnetic head and the magnetic tape, the entire magnetic head is finished wrapped with a finishing wrapping tape (not shown).

After connection cords (not shown) are soldered to each terminal board 36c, 37c, and 38c, a side shield plate 45 and a cord extraction hole 46a are further installed in the base block 30 at the bottom, as shown in FIG. Attach a back shield plate 46 with an opening to write/read/write, 2 channels,
A 6-gap magnetic head is completed. The static characteristics and dynamic characteristics (DC resistance, impedance, recording/reproducing level, etc.) of the completed magnetic head are measured.

A magnetic head 50 shown in FIG. 10 includes a first write/read head assembly 51 and a second write/read head assembly 52 manufactured by the method described above, each mounted on a base block 53. Shield blocks 54a, 54b; 55a, 55b are installed on both sides of the head assemblies 51, 52.
and an erase head 56 having an erase head core 56a and an erase gap 56b.
It is made up of the following. The first and second write/read head assemblies 51, 52 are formed with write head cores 51a, 52b and read head cores 51b, 52b, respectively. Recording and reproduction of one track is performed, and then the write head core 52a and the read head core 51b
The head assemblies 51 and 52 are constructed so that the recording and reproduction of the second track is performed by the above-mentioned first embodiment. It will be easily understood that it can be manufactured with some changes.

Also in the magnetic head 50 shown in FIG. 10, a gap 57 is formed between the shield blocks 54b and 55a, so that the shielding characteristics are good. In addition, each head assembly 51, 5
2 is positioned on the base block 53 while maintaining a strict parallel relationship by the reference surfaces 53a and 53b. In the figure, 51c and 52c are terminal plate mounting grooves formed at the bottoms of the head assemblies 51 and 52, respectively, 58 is a screw hole for mounting the base block 53, 56c is a terminal in the erase head 56, and 59 is a base block for the erase head 56. Block 53
60 is a side shield plate, 61 is a rear shield plate, and 61a is a cord extraction hole formed in the rear shield plate, but since these are the same as in the previously described embodiments, detailed explanation will be given. Explanation will be omitted. This magnetic head 50 includes a side end protrusion 54b of a shield block 54a and a ring core 51 of a first write/read head assembly 51.
Convex portion 51 approximately centered on the gap a, 51b
d, a convex portion 52d approximately centered on the gap of the ring cores 52a and 52b of the second write/read head assembly 52, and a convex portion 52d of the core 56a of the erase head 56;
It is configured to come into sliding contact with the magnetic tape T at certain points.

<Effects of the Invention> According to the present invention as described above, since the terminal plate is attached across a plurality of supports interposing the head core, this terminal plate acts as a reinforcing material and has excellent strength. head assembly can be provided. Furthermore, by having this terminal plate, it becomes easy to check the characteristics of a single head assembly, and the yield of a composite magnetic head composed of a plurality of these head assemblies is improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the process of cutting out a plurality of ring cores from a headblock, Fig. 2 shows the obtained ring core, A is an end view thereof, B is a sectional view thereof, C is a top view thereof, FIG. 3 is a perspective view showing a state in which this ring core is wound, and FIGS. 4 to 6 show the process of forming a two-channel head assembly using two ring cores thus obtained. A perspective view, a front view, a perspective view, and FIG. 7 show the processed shape of the base block, where A is a front view, B is a rear view, C is a bottom view, D is a left side view, Figure 8 shows the result obtained by attaching and fixing the three head assemblies obtained on this base block and attaching a shield plate to each, with A being the front view and B being the rear view. ,
C is a bottom view thereof, D is a left side view thereof, and FIG. 9 is a two-channel magnetic head having a write/read/write head according to the present invention manufactured by attaching side and rear shield plates thereto, 6. 10 shows the configuration of a magnetic head according to another embodiment of the present invention, A is a left side view thereof, B is a rear view thereof, and FIG. B is a front view, B is a bottom view, C is a rear view, D is a left side view, and E is a right side view. Explanation of symbols 1: L side ferrite block, 8:
Winding recess, 9: Track groove, 10: R side ferrite block, 13: Gap material, 15, 16: Molten glass material, 17: Winding window, 18: Head block, 20: Winding recess, 21: Ring core, 22 :
Winding wire, 23: Head assembly, 24, 25, 2
6: Holder, 27: Terminal board, 28: Epoxy resin, 29: Grinding wheel, 30: Base block, 31, 32, 33: Head assembly mounting stand, 31a, 32a, 33a: Head assembly reference surface, 34, 35: Steps, 36, 38: write head assembly, 37: read head assembly,
39a, 39b, 40a, 40b, 41a, 41
b: Shield plate, 42, 43: Gap, 44:
Base block mounting screw hole, 45: Side shield plate, 46: Rear shield plate, 50: Magnetic head,
51, 52: write/read head assembly, 5
3: Base block, 54a, 54b, 55a,
55b: Shield plate, 56: Erasing head, 57:
Gap, 58: Base block mounting screw hole, 5
9: Erase head installation screw, 60: Side shield plate, 61: Rear shield plate.

Claims (1)

[Scope of Claims] 1. One or more wire-wound head cores, two or more supports supporting the head cores, and at least one of the plurality of supports having a predetermined pattern connected to the wire-wound head cores. 1. A head assembly comprising: a terminal plate mounted astride supporting bodies at both ends so as to integrate the supporting bodies at both ends. 2. Claim 1, characterized in that a groove is formed in the plurality of supports, and the terminal plate is attached by fitting the terminal plate into the groove.
Head assembly as described in Section.