JPH09115109A - Magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the position precision of the sticking of front and back cores at manufacture time by making the respective cores butt against the respective front cores embedded in a mask and integrating them while the back cores are united with a shield plate. SOLUTION: A magnetic head core 12 for recording and a magnetic head core 11 for reproduction consist of the front cores 11c and 12c and back cores 11d and 12d respectively and when those magnetic heads are manufactured, the back cores 11d and 12d are positioned and fixed to the front cores 11c and 12c provided to the mask. The cores lid and 12d corresponding to the cores 11c and 12c are formed integrally with the shield plate 17, and the shield plate 17 and back cores 11a and 12d are made to be present on the same plane by polishing their surfaces abutting on the mask 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called multi-channel magnetic head device having a plurality of magnetic gaps.

[0002]

2. Description of the Related Art Generally, a so-called multi-channel magnetic head device having a plurality of magnetic gaps on a running surface of a magnetic recording medium has a recording magnetic head core having a recording gap and a reproducing gap as a two-channel type. A reproducing magnetic head core is provided to form one channel, and a reproducing gap and a recording gap are provided in parallel with this channel, that is, the positions of the above-mentioned channel and each magnetic core are exchanged, and another channel is further provided. There is something to configure.

In this case, there is a so-called read-after-write system in which recording / reproducing operations are simultaneously performed on the same channel, recorded data and reproduced data are collated, and data recording and recording error check are simultaneously performed. It has been adopted, and by doing so, the speed of recording / playback operations can be increased.

Therefore, when a magnetic tape is used as a magnetic recording medium when checking a recording error, the magnetic tape travels in both directions unlike the case where a disk-shaped magnetic recording medium such as a hard disk is used. Two channels in which the recording gap and the reproducing gap are arranged in opposite directions with respect to the direction are required.

Specifically, in the two-channel magnetic head device, as shown in FIG. 10, a recording magnetic head core 112 having a recording gap gw and a reproducing magnetic head core having a reproducing gap gr are formed. 111
And a recording magnetic head core 11 by rotating the channel 101 half a turn.
2 and a reproducing magnetic head core 111 are provided with a channel 102 equivalent to that in which the positions thereof are reversed.

Each of the magnetic cores 111 and 112 of each of the channels 101 and 102 has a pair of recording magnetic head core halves 112a and 112b, as shown in FIG. 11 (a sectional view taken along the broken line AA 'in FIG. 10). And a pair of reproducing magnetic head core halves 111a and 111b are joined at the abutting surfaces via gap materials to form magnetic gaps gw and gr. These magnetic cores 111, 1
Wires such as copper wires are wound around 12 to form magnetic coils 115 and 116, respectively.

Further, the magnetic head device has a mask 103 made of a magnetic material to which the pair of channels 101 and 102 are fixed, and each channel 101 and 102 in the mask 103 has its magnetic core 111 and 11 respectively.
The two magnetic gaps gr and gw are arranged facing each other.

Here, CaTiOs are provided around the magnetic cores 111 and 112 of the channels 101 and 102, respectively.
First partition plates 113 made of a non-magnetic material such as ₃ are joined and magnetically shielded from the magnetic material of the mask 103. Further, the second partition plate 11 made of a non-magnetic material such as CaTiO _{3 is provided so as} to cross the substantially central portion of the mask 103.
4 are provided, and the recording magnetic head core 112 and the reproducing magnetic head core 111 of each channel 101, 102 are provided.
Each of the first partition plates 113 surrounding the first partition plate 113 and the second partition plate 114 are joined in a state of being in contact with each other, and the recording magnetic head core 112 and the reproducing magnetic head core 111 are magnetically separated from the magnetic material of the mask 103. Is shielded by.

A shield plate 117 for magnetically shielding the recording magnetic head core 112 and the reproducing magnetic head core 111 in each of the channels 101 and 102 is provided below the second partition plate 114. , The upper surface of the shield plate 117 is the second partition plate 11
The magnetic head portion 121 is configured by being adhesively fixed to the lower surface of No. 4. It should be noted that each of the substrates 11 for attaching shield wires for external connection is provided on both side surfaces of the shield plate 117.
8a and 118b are adhesively fixed.

Then, the magnetic head 121 is housed in a housing-like shield case 119 having an opening on the upper surface,
The magnetic head device is configured by fixing the magnetic head portion 121 to the shield case 119 so that the magnetic recording medium sliding surface of the magnetic head portion 121 faces the opening.

[0011]

Generally, in a magnetic recording / reproducing apparatus using a tape-type magnetic recording medium, it is necessary to have recording / reproducing compatibility between a plurality of apparatuses for the same recording medium. In the present time when the recording density is further increased, it is important to suppress variations in the electrical characteristics of the recording magnetic head core and the reproducing magnetic head core of each channel in the magnetic head device.

By the way, when manufacturing the above magnetic head device, as shown in FIG.
1, 102, and the front core 112c of the recording magnetic head core 112 and the reproducing magnetic head core 111,
111c is formed on the mask 103, and the back cores 112 corresponding to the front cores 112c and 111c are formed.
The d and 111d are bonded one by one by mechanically pressing them on a predetermined price tool.

However, each back core 111d, 1
The thickness of 12d is as thin as 1 mm or less, and depending on the pressing method, the back cores 111d and 112d are inclined and adhered to each other, which may cause a so-called back gap.

As described above, it is extremely difficult to attach a plurality of back cores uniformly to the corresponding front cores with the same accuracy, and this is the main cause of variations in the electrical characteristics of the magnetic head device. It is one.

Therefore, the present invention has been proposed in view of such a conventional situation, and improves the positional accuracy of the attachment of the front core and the back core at the time of manufacturing, and makes the back gap generated at the time of attachment uniform. It is an object of the present invention to provide a magnetic head device capable of significantly improving the reliability of the product by reducing the variation in the electrical characteristics among the magnetic cores by reducing the number of the magnetic cores.

[0016]

The object of the present invention is a magnetic head device having at least one channel in which magnetic head cores for recording and reproducing are arranged in the running direction of a magnetic recording medium.

In the magnetic head device of the present invention, the magnetic head core is separated into a front core and a back core having an operating gap, and each front core is embedded in a mask so that the operating gap faces the sliding surface of the magnetic recording medium.
The back cores are abutted on and integrated with the front cores embedded in the mask while being integrated with a shield plate arranged between the recording magnetic head core and the reproducing magnetic head core. .

In the present invention, the main object is a magnetic head device in which the recording magnetic head cores and the reproducing magnetic head cores are arranged in opposite directions in adjacent channels.

At this time, specifically, it is preferable that the shield plate and the back cores, which are integrally formed, are constructed so that the abutting surfaces for the mask are on the same plane.

As described above, in the magnetic head device of the present invention, the shield plate and the back cores are integrally formed, and when the magnetic head device is manufactured, the back plates that have already been positioned relative to each other are formed. Core (and shield plate)
Are simultaneously bonded to the corresponding front cores provided on the mask. Therefore, it is possible to perform the positioning accurately and easily without having to position each back core, and the back gap generated in each magnetic core is also made uniform.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a magnetic head device according to the present invention will be described below with reference to the drawings.

In this magnetic head device, as shown in FIG. 1, a magnetic head portion 21 which is a constituent element thereof has a recording magnetic head core 12 in which a recording gap gw is formed as an operating gap, and a reproducing gap as an operating gap. A channel 1 in which a reproducing magnetic head core 11 having a gap gr is integrally formed, and the recording magnetic head core 12 and the reproducing magnetic head core 11 are reversed in position by rotating the channel 1 a half turn. It is composed of an equivalent channel 2.

Each magnetic core 11, 1 of each channel 1, 2
2 is a pair of recording magnetic head core halves 12a, 1 as shown in FIG. 2 (a sectional view taken along the broken line AA 'in FIG. 1).
2b, and a pair of reproducing magnetic head core halves 11a, 1
The magnetic gaps 1g and 1b are joined to each other at the abutting surfaces via the gap members to form magnetic gaps gr and gw. Wires such as copper wires are wound around the magnetic cores 11 and 12 to form magnetic coils 15 and 16, respectively.

Further, the magnetic head device has a mask 3 made of a magnetic material such as Mn-Zn ferrite to which the pair of channels 1 and 2 are fixed. The magnetic cores 11 and 12 are arranged so as to face the magnetic gaps gr and gw.

The recording magnetic head core 12 and the reproducing magnetic head core 11 are respectively the front cores 11.
c, 12c and back cores 11d, 12d. The back cores 11d, 12d are positioned and fixed to the front cores 11c, 12c provided on the mask 3 when the magnetic head is manufactured.

Here, the first partition plates 13 made of a non-magnetic material such as CaTiO ₃ are joined around the magnetic cores 11 and 12 of the channels 1 and 2, respectively, and the magnetic material of the mask 3 is removed. It is magnetically shielded.

Further, a second partition plate 14 made of a non-magnetic material such as CaTiO ₃ crosses the mask 3 substantially at the center thereof and surrounds the recording magnetic head core 12 and the reproducing magnetic head core 11 of each channel 1, 2. Each of the first partition plate 13 and the second partition plate 14 is joined in contact with each other, and the recording magnetic head core 12 and the reproducing magnetic head core 11 are magnetically shielded from the magnetic material of the mask 3. Has been done.

Then, immediately below the second partition plate 14,
Recording magnetic head core 12 in each channel 1 and 2
A shield plate 17 for magnetically shielding the reproducing magnetic head core 11 from the magnetic head core 11 is provided.
The upper part of 7 is bonded to the magnetic material of the mask material located on both sides of the second partition plate 14.

On the shield plate 17, as shown in FIG.
The back cores 11d and 12d corresponding to the front cores 11c and 12c provided on the mask 3 are integrally formed, and the shield plate 17 and the back cores 11d and 12d are formed.
The butting surfaces S1 and S2 with respect to the mask 3 are polished so that they are present on the same plane. It should be noted that substrates 18a and 18b for attaching shield wires for external connection are adhered and fixed to both side surfaces of the shield plate 17.

The magnetic head portion 21 is housed in a housing-like shield case 19 having an opening on the upper surface, and the magnetic recording medium sliding surface a of the magnetic head portion 21 is exposed from the opening portion. The magnetic head unit 21 is fixed to the shield case 19 to form the magnetic head device.

Next, a method of manufacturing the above magnetic head device will be described. First, a recording magnetic head core 12 and a reproducing magnetic head core 1 are formed from predetermined magnetic core blocks.
The front cores 11c and 12c of No. 1 are cut out, respectively.

In addition, a set of grooves is formed on one side surface of M.
A pair of magnetic plates 31 and 32 made of n-Zn or the like is prepared. Then, the first partition plate 13 made of a non-magnetic material is adhered to the groove portions of the magnetic plates 31 and 32, and the front cores 11c and 1 are attached to the first partition plate 13 in the corresponding groove portions.
Glue 2c.

Then, auxiliary plates 33 and 34 made of a non-magnetic material are attached to both sides along the longitudinal direction, respectively.
A central magnetic plate 35 made of Zn or the like is prepared. Then, the pair of magnetic plates 31 and 32 are adhered and fixed via the central magnetic plate 35, and the front cores 11c,
12c exposes the sliding surface a of the magnetic recording medium.

Subsequently, a groove portion is cut in the substantially central portion of the mask 3 so as to cross between the front core 11c and the front core 12c, and the second partition plate 14 made of a nonmagnetic material is provided in the groove portion. To glue.

Then, the upper surface of the mask 3 is subjected to a predetermined grinding process to produce the front core portion 41 shown in FIGS. 4 and 5.

Subsequently, as shown in FIG. 6, CaTiO ₃
And a pair of blocks 43 and 44 made of ferrite such as Mn—Zn are prepared.
The blocks 43 and 44 are joined to both side surfaces of the block 42 to produce a back core block 45.

Next, as shown in FIG. 7, the first groove 46 is formed on one main surface of the back core block 45 in a direction substantially orthogonal to the longitudinal direction thereof so as to match the track spacing. After that, each block 43, 44 of the back core block 45
A groove 47 is formed in the main surface on the side opposite to the above-mentioned one main surface in the substantially central portion along the longitudinal direction.

Further, as shown in FIG. 8, after the groove 48 is cut along the longitudinal direction at the central portion of the same main surface as the cut surface of the groove 46 of the back core block 45, the alternate long and short dash line L
Each back core chip 51 is cut out by performing a cutting process along.

Then, the groove 48 of each back core chip 51 is formed.
Is inserted into the shield plate 17 and fixed by adhesion. At this time,
As shown in FIG. 9, it is necessary to cut the groove 49 in order to secure the winding area of the magnetic coil. Then, the back core portion 52 is manufactured by polishing the upper portions of the respective back core chips 51 and the shield plate 17 to the position of the two-dot broken line M to form the butt surfaces S1 and S2 on the same plane.

Then, this back core chip 51 is adhered to the pasting side S1 and S2 of the front core portion 41 on the sticking side shown in FIG. 5, and the recording magnetic head core 12 and reproducing magnetic head core of each channel 1 and 2 are bonded. 11 is formed, and the abutting surface S2 of the shield plate 17 is bonded so as to come into contact with the second partition plate 14. At this time,
In the back core chip 51, each back core 11d,
Since the 12d and the shield plate 17 are integrally formed, the positioning is extremely easy, and the front cores 11c and 12c and the back core 11 in each of the magnetic cores 11 and 12 are easily positioned.
It is possible to suppress the occurrence of variations that are likely to occur in the back gap that occurs between d and 12d.

Subsequently, the recording magnetic head core 12 and the reproducing magnetic head core 11 of the respective channels 1 and 2 are wound to form magnetic coils 15 and 16, and the magnetic head portion 2 is formed.
1 is produced.

Then, the magnetic head device is completed by housing and fixing the magnetic head portion 21 in a shield case 19 having a housing shape.

As described above, in the magnetic head device according to this embodiment, the shield plate 17 and the back cores 11 are provided.
d and 12d are integrally formed, and when the magnetic head device is manufactured, the back cores 11d and 12d (and the shield plate 17) that are already relatively positioned are simultaneously provided on the mask 3. Front core 11
It is joined to c and 12c. Therefore, it is possible to perform the positioning accurately and easily without having to position the back cores 11d and 12d separately.
The back gaps generated in 1 and 12 are also made uniform.

Therefore, the positional accuracy of the attachment of the front cores 11c and 12c and the back cores 11d and 12d at the time of manufacturing is improved, the variation in the electrical characteristics between the magnetic cores 11 and 12 is reduced, and the product The reliability is greatly improved.

Although the various embodiments to which the present invention is applied have been described above, the present invention is not limited to these embodiments, and the shape, the material, and the material may be changed without departing from the scope of the present invention. Each manufacturing process or the like can be arbitrarily changed.

[0046]

According to the present invention, the positional accuracy of the attachment of the front core and the back core at the time of manufacturing is improved,
The back gap generated at the time of sticking is made uniform, the variation in electrical characteristics among the magnetic cores is reduced, and the reliability of the product can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a magnetic head device according to the present embodiment.

FIG. 2 is a cross-sectional view taken along the broken line A-A ′ in FIG.

FIG. 3 is a perspective view schematically showing a back core portion in which each back core, which is a component of the magnetic head device, and a shield plate are integrally formed.

FIG. 4 is a side view schematically showing a front head portion which is a component of the magnetic head device.

FIG. 5 is a plan view schematically showing a front head part which is a component of the magnetic head device.

FIG. 6 is a perspective view schematically showing the manufactured back core block.

FIG. 7 is a perspective view schematically showing a state in which various grooves are cut in the back core block.

FIG. 8 is a perspective view schematically showing how the back core block is cut.

FIG. 9 is a perspective view schematically showing how a back core chip is inserted into a shield plate.

FIG. 10 is a perspective view schematically showing how the upper parts of the back core chip and the shield plate are polished.

FIG. 11 is a cross-sectional view taken along the broken line AA ′ in FIG.

FIG. 12 is a perspective view schematically showing how back cores corresponding to the front cores of the recording magnetic head core and the reproducing magnetic head core are bonded.

[Explanation of symbols]

 1, 2 channels 3 mask material 11 recording magnetic head core 12 reproducing magnetic head core 11c, 12c front core 11d, 12d back core 13 first partition plate 14 second partition plate 17 shield plate 19 shield case 21 magnetic head Part 41 front core part 52 back core part gw recording gap gr reproduction gap

Claims (3)

[Claims] 1. A magnetic head device having recording and reproducing magnetic head cores having at least one or more channels arranged in a running direction of a magnetic recording medium, each magnetic head core having a front gap and a back core. And each front core is embedded in the mask so that the working gap faces the sliding surface of the magnetic recording medium, and each back core is attached to the shield plate between the recording magnetic head core and the reproducing magnetic head core. A magnetic head device characterized in that it is abutted against and integrated with each front core embedded in a mask in an integrated state. 2. The magnetic head device according to claim 1, wherein the recording magnetic head core and the reproducing magnetic head core are arranged in opposite directions in adjacent channels. 3. The magnetic head device according to claim 1, wherein the integrally formed shield plate and the abutting surfaces of the back core and the mask or front core are on the same plane.