JPH0461608A - Magnetic head - Google Patents

Abstract

PURPOSE:To rationalize the productivity and to reduce the cost by setting the thickness dimensions of each of two front core assemblies and a space plate to the same. CONSTITUTION:The magnetic head is provided with two front core assemblies 1, 65 which join a back core, respectively, are provided in parallel in the track width direction, and constitute one or plural magnetic cores, and a space plate 30 which is provided between two front core assemblies, and joins two front core assemblies. Also, the thickness dimensions of each of two front core assemblies 1, 65 and the space plate 50 are set to the same. Accordingly, at the time of working the respective core assemblies 1, 65 and the space plate 30, it becomes possible to execute working under the same condition, and to use the working and a jig and a tool in common. In such a way, the productivity can be rationalized and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head for magnetically recording or reproducing information on a magnetic recording medium.

[Conventional technology]

Conventionally, as this type of magnetic head, there is a magnetic head that records and reproduces information on a floppy disk, which is a flexible magnetic disk, by a so-called tunnel erasing method. Two conventional examples of this magnetic head will be explained below with reference to FIGS. 4 to 9 of the drawings.

First, a first conventional example will be explained using FIGS. 4 to 6. FIG. 4 is an exploded view showing a first conventional magnetic head.

In Figure 4 of the drawing, 1 is the front core assembly (
The front core part of the magnetic core for recording/reproducing (hereinafter referred to as "recording/reproducing core") 2 and the magnetic core for erasing (hereinafter referred to as "erasing core") 4 for performing tunnel erasure is connected with a spacer 6 (hereinafter referred to as F core assembly). It is configured as a conjugate that is bonded through

The recording/reproducing core 2 has a T-shaped front core 2a and an I-shaped front core 2b joined together via a recording/reproducing cap 3, and further includes a backing fan 1 at the rear end of the front cores 2a, 2b.
5 are joined together.

Further, the erasing core 4 joins a T-shaped front core 4a and a single-shaped front core 4b via an erasing gap 5.5a, and further includes a back core 1 at the rear end of the front cores 4a and 4b.
It is constructed by joining 6.

However, before joining the respective back cores 15.16, the recording/reproducing core 2 and the erasing core 4 are combined with each other via a spacer 6 to form the core assembly 1, and non-magnetic sliders 7.8 are bonded or glass welded to both sides of the core assembly 1. It is joined by etc.

The slider 7.8 is in sliding contact with a magnetic disk (not shown) together with both cores 2.4 to stabilize the sliding contact between both cores 2.4 and protect both cores 2.4, and is made of ceramics or the like. It has notches 7b and 8b, and is formed in a block shape with an L-shaped cross section. The sliders 7, 8 each have a joint surface 7a at the upper end in the figure that is not cut out on the side surface facing the core assembly 1.

8a is joined to the fidget core assembly 1.

After this joining, the coil hobbin 9 around which the recording/reproducing coil 10 is wound and the coil hobbin 12 around which the erasing coil 13 is wound are assembled into the front cores 2a, 4a of the core assembly 1.
The back cores 15 and 16, which were fitted into the respective grooves of the
, 2b4a, 4b. Figure 5 of the drawing is
The magnetic head main body 18 constructed in this manner is shown.

Then, as shown in FIG. 5 of the drawings, the magnetic head main body 18 is fixed to a support plate 19 made of stainless steel or helium copper.
Flexible printed circuit board 20 coupled to support plate 19
and the coil terminal 10a.

13a (both shown in FIG. 4) are connected to form a magnetic head 21.

The magnetic head 21 configured in this way is mounted on a head carriage with the support plate 19 fixed in a disk drive device (not shown), and the core assembly 1 and the slider 7.8 are shown in FIGS. The upper surface in FIG. 5 is used as the disk sliding contact surface and is in close contact with the magnetic disk, and recording is performed using the tunnel erasing method shown in FIG. 6.

That is, in this tunnel erasing method, after data is recorded on the magnetic disk moving in the direction of the arrow in FIG. is formed.

However, recently, the capacity of floppy disk devices has been increasing, and even devices with capacities greater than IOMB have been commercialized. Higher capacity is achieved by increasing linear recording density and track density. The maximum linear recording density for current floppy disk devices with a capacity of 1 to 2 MB is 9.7.
The track density is 1357P I (R/W) in BP1.
However, to achieve a capacity of 10 MB or more, the maximum linear recording density must be 35 KBPI or more, the track density must be 405 TPI or more (R/W), and the rack width is 50 μm.
m or less, it becomes necessary to increase both the linear recording density and the track density by 3 to 4 times.

Next, a second conventional example will be explained using FIGS. 7 to 9.

If the track density is to be improved, see FIGS. 4 and 5.
Instead of a tunnel erasing type like the magnetic spatula (821) shown in the figure, a servo signal type in which servo signals are recorded on an interlocking magnetic disk is used. FIG. 7 is an explanation of a method for recording on a magnetic disk using a servo signal method. In this case, track positioning is performed using a servo signal 24 recorded in advance on the magnetic disk, and data is written using only the magnetic head of the recording/reproducing core 2 having only the recording/reproducing gap 3, thereby forming a data track 22.

This type of servo signal is used in floppy disk drives with improved track density beyond 2007PI.

However, when it comes to using internal floppy disk devices, higher-end models are required to maintain compatibility with lower-end models, or to maintain software and data compatibility. For example, a 3.5-inch product with a capacity of 2MB, IMB's R
/W compatible (IMB write and read possible), 4MB
IMB and 2MB R/W compatibility is possible for products with a capacity of 2MB. However, these have a track density of 1357P.
R/W compatibility is possible even though it is the same as I, and if the track density differs, the reader with a lower track density will be able to read it, but it will not be possible to write, so the compatibility of conventional software and data is sufficient. It will no longer be something you can take.

In order to maintain compatibility even with different track densities, a composite magnetic head was proposed in which a tunnel erase type magnetic core and a servo signal type magnetic core were arranged side by side in the track width direction. ing. Its structure will be explained with reference to FIGS. 8 and 9. In these figures, parts common or equivalent to those in FIGS. 4 and 5 are denoted by the same reference numerals, and explanations of the common parts will be omitted.

FIG. 8 is an exploded perspective view of a second conventional magnetic head main body.

In FIG. 8, a tunnel erase type recording/reproducing core 2 and an erase core 4 are constructed using a core assembly 1 and back cores 15 and 16 that are substantially the same as those in FIGS. 4 and 5. Both cores 2.4 are configured for a track density of 135 TPI, for example. The difference from the ones in Figures 4 and 5 is that
In order to avoid the coil bobbin 27 of the recording/reproducing core 40, which will be described later, the coil bobbin 12 of the erasing core 4 is replaced with the back core 16.
mated to. For this reason, the back core 16 is formed long, and the front core 4a is formed into a substantially L-shape.

On the other hand, reference numeral 40 indicates a servo signal type recording/reproducing core, which has a high track density (for example, 4057PI to 900TP).
I, etc.). The recording/reproducing core 40 is constructed by joining a back core 29 to the lower end of the core assembly 25 in the figure. The core assembly 25 is constructed by joining an L-shaped front core 25a and a T-shaped front core 25b with a recording/reproducing cap 26 interposed therebetween. Then, the bobbin 27 around which the coil 28 is wound is fitted onto the front core 25b.

Next, the assembly of the second conventional magnetic head main body will be explained with reference to FIGS. 8 and 9.

In the process of assembling the magnetic head main body, first, the core assemblies 1.25 are bonded together with a spacer plate 30 (FIG. 9) made of non-magnetic ferrite or ceramic interposed therebetween. The spacing plate 3o is formed in an elongated rectangular or T-shaped shape corresponding to the upper end of the side surface of the core assembly 1.25, and is made of a high magnetic permeability material in order to prevent crosstalk between the core assemblies 1.25, which will be described later. In some cases, it is formed by combining non-magnetic ferrite or ceramic on both sides of a certain ferrite.

Next, sliders 7.8 on both sides of the core assembly 1.25
or joined.

Next, after fitting the coil bobbins 9 and 27 to the front cores 2a and 25b, respectively, the coil hobbin 12 is fitted to the back core 16 portion of the back cores 15 and 16 connected via the spacer 17, and the back core 15 and 16 are joined to the front cores 2a, 2b, 4a, and 4b. Further, the back core 29 is joined to the front cores 25a and 25b. In this way, the magnetic head main body 31 shown in FIG. 9 is constructed.

When performing recording and reproduction on a magnetic disk (not shown) using the three magnetic head bodies described above, by selecting and using cores 2, 4, or 4o as appropriate depending on the difference in track density, it is possible to improve the performance of higher-end models. It becomes possible to record and reproduce data with lower-level models, making so-called R/W compatibility possible.

Furthermore, Japanese Patent Application No. 1-200394 and Japanese Patent Application No. 2-19759 are examples of improved conventional composite magnetic heads.
Both numbers indicate R/W compatibility.

[Problem to be solved by the invention]

As described above, in the conventional composite magnetic head, the lower core assembly 1 and the upper core assembly 25 have different track widths for recording and reproduction, and accordingly, the thickness of each core assembly 1.25 also differs. .

In addition, in order to prevent mutual interference (crosstalk) between the core assembler assemblies 1.25, the thickness of the spacing plates 30, which are arranged at a predetermined distance from each other, is also different, and they have different shapes like the coil pobbins 9 and 27. Therefore, the number of parts increases, and the core assemblies 1 and 25 and the spacing plate 30
When creating a core block, separate settings must be made from the cutting process to the lapping process for the core block, which requires separate setup changes for the processing machine and separate processing jigs. There was a problem in that it was time-consuming.

The present invention was made to solve the above-mentioned problems, and in a magnetic head in which core assemblies with different track densities are arranged side by side with a spacer plate interposed therebetween, the thickness dimensions of the core assembly and the spacer plate are different from each other. The purpose of this is to set the same values to make it possible to process each core assembly and spacer plate under the same conditions and to use common processing machines and jigs, thereby streamlining productivity and reducing costs. shall be.

[Means to solve the problem]

Therefore, in the invention of claim 1, two front core assemblies are provided, each having their back cores joined together and arranged in parallel in the track width direction and constituting one or more magnetic cores, and a gap between the two front core assemblies. is located in
A magnetic head having a spacing plate joining the two front core assemblies, in which each of the two front core assemblies and the spacing plate have the same thickness dimension to achieve the above object. It is.

Further, in the invention of claim 2, the above object is achieved by the magnetic head of claim 1, in which a blocking plate is laminated and bonded together with a spacing plate between two front core assemblies.

[Effect]

In the magnetic head of the present invention, the thickness dimensions of each of the two front core assemblies and the spacing plate are the same, so that when manufacturing the front core assembly and the spacing plate, cutting and lapping can be performed under the same conditions. At the same time, common processing jigs will be used.

Further, in the above invention, mutual interference between the two front core assemblies is prevented by stacking and joining the blocking plate together with the spacing plate between the two front core assemblies.

〔Example〕

Hereinafter, two embodiments of the present invention will be described based on the drawings.

First, a first embodiment will be described using FIG. 1 and FIG. 2.

FIG. 1 is a front view of a composite magnetic head according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing the manufacturing process of a core assembly used in the composite magnetic head of the first embodiment.
In the figure, a is a magnetic substrate, b is track groove processing, C is a winding groove, d is a magnetic substrate, e is track groove processing, f is welding bonding,
g stands for cutting, h stands for core assembly steps and intermediate products.

In the drawings, the same or equivalent components as those in the conventional example are indicated by the same reference numerals, and redundant explanation will be omitted.

In FIG. 1, reference numeral 1.65 denotes a front core assembly (hereinafter referred to as a core assembly) which joins back cores and is arranged in parallel in the track width direction to constitute one or more magnetic cores. Further, 30 is made of non-magnetic ferrite or ceramic, and is connected to the core assembly 1.
．． 65 and is a spacer plate that joins the core assembly 1.65.

The difference between this first embodiment and the second conventional example is that the core assembly 1.25 and the spacing plate 30 in FIGS. 8 and 9 of the second conventional example have different thickness dimensions. In contrast, the thickness of the core assembly 1.65 and the thickness of the spacer plate 30 in FIG. 1 of the first embodiment of the present invention are made the same.

The other configurations are the same as the second conventional example.

Next, the method for manufacturing the core assembly of the first embodiment will be described in a second embodiment.
This will be explained using figures.

In FIG. 2, first, as shown in FIG. 2(a), a rectangular parallelepiped magnetic substrate 50a made of ferrite is coated with
) A plurality of track grooves 54 defining the recording track width of the upper core are formed as shown in FIG. is provided to form the L core block 56.

Note that the winding groove 54 is also a groove that regulates the gap depth.

On the other hand, a plurality of track grooves 54 as described above are formed on a rectangular parallelepiped magnetic substrate 50b made of ferrite shown in FIG. 2D, as shown in FIG.

(Fig. 2(C)), (Fig. 2(F))
), a high saturation magnetic flux density magnetic material such as Fe-Al-5i alloy is deposited on the upper abutting surface to a thickness of several micrometers using a thin film forming technique such as f-deposition or sputter linking, and then a 5in2 film that will become the recording/reproducing cap 26 is formed. Alternatively, a non-magnetic material such as CrO2 is formed using the same thin film forming technique, and the abutting surfaces of the L core block 56 and the ■ core block 57 are made to face each other as shown in FIG. The space is filled with a bonding material such as glass, and welding and bonding are performed to form the core block 6o.

Next, this core block 60 is removed by excision or cutting along the cutting lines 61 and 62 to form the core block 6o shown in FIG. A core assembly 65 is shown in (h).

By making the core thickness T2 determined by the pitch interval of the cutting lines 63, the core thickness T of the lower core assembly 1, and the thickness T3 of the spacing plate 30 the same dimension, the core assembly 1.65 and the spacing plate 30 are made the same size. There is no need to change settings during cutting, and processing can be performed under the same conditions. Therefore, it is possible to improve productivity in parts processing by making it possible to use common processing jigs without requiring setup changes or changes in dimensional settings. Incidentally, the same thickness of the core assembly 1.65 and the spacing plate 30 is generally processed to be 0.2 to 0.4 noa.

Next, a second embodiment of the present invention will be described using FIG. 3.

FIG. 3 is an enlarged front view of main parts of a composite magnetic head illustrating a second embodiment of the present invention, and shows a core assembly 1 having a recording/reproducing gap 3 for recording and reproducing a lower track width and an upper track. It has a recording and reproducing gap 26 for recording and reproducing the width, and a high saturation magnetic flux density magnetic material such as Fe-Al-3i alloy or amorphous alloy is deposited on both sides of the recording and reproducing gap 26 using a thin film forming technique such as vapor deposition or sputtering. A spacing plate assembly 70 has spacing plates 69 made of a non-magnetic material such as glass or ceramic bonded to both sides of a shielding plate 68 made of a magnetic material such as ferrite between a core assembly 65 having an alloy layer 66 arranged with μmTs, @shi. Arrange and configure. Noisy core assembly 1
, 65, by making the core thickness T, , T2 and the thickness T of the spacer plate assembly 70 the same dimension
Processing is possible under the same conditions as in the example.

In this second embodiment, the core assembly 1.65
Since the blocking plate 68 is placed between the two core assemblies 1
, 65 can be more effectively prevented from interfering with each other.

Incidentally, the arrangement interval P between the track center of the lower core assembly 1 and the track center of the upper core assembly 65 is the core thickness T + , T2.

Since it is determined by T3, even if the upper core assembly 65 has different track densities for 405 TPI and 542 TPI, P=2·T+<T+=T2=D,).

〔Effect of the invention〕

As explained above, in a magnetic head in which core assemblies with different track densities are arranged side by side via a spacing plate, the thickness dimension of each core assembly and the spacing are set to be the same, and the thickness of each core assembly and the spacing are set to be the same. When processing a plate, it is possible to obtain a magnetic head that enables processing under the same conditions and common use of processing machines and jigs, thereby streamlining productivity and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a front view of a composite magnetic head according to a first embodiment of the present invention, FIG. 2 is a perspective view showing the manufacturing process of a core assembly used in the composite magnetic head of the first embodiment, and FIG. 3 is a front view of a composite magnetic head according to a first embodiment of the present invention. FIG. 4 is an exploded perspective view showing the magnetic head of the first conventional example;
FIG. 5 is a perspective view of a magnetic head that is a combination of the magnetic head shown in FIG. 4, FIG. 6 is an explanatory diagram of the first conventional tunnel erase method, FIG. This figure is an exploded perspective view of a composite magnetic head main body which is a second conventional example, and FIG. 9 is a perspective view of a magnetic head that is a combination of FIG. 8. 1.65 - Core assembly 3.26...
...Trust playback caps 50a, 50b=-Magnetic substrate, T2 4...--Track full 5...Winding groove 6...-L core block 7... -1 Core block 8...Binding material 0...Core block 6--Thin film of magnetic material 8-=-Shielding plate 9...Space plate 0...・・Spacer plate assembly T 3 ”” ・Core thickness

Claims (2)

[Claims] (1) two front core assemblies each having back cores joined together and arranged in parallel in the track width direction and constituting one or more magnetic cores;
A magnetic head comprising: a spacing plate for joining two front core assemblies, wherein each of the two front core assemblies and the spacing plate have the same thickness dimension. (2) Claim 1 characterized in that a blocking plate is laminated and joined together with a spacing plate between the two front core assemblies.
The magnetic head described.