JPS6275907A - Magnetic head - Google Patents

Abstract

PURPOSE:To shorten the interval between the gap for recording and reproducing and the gap for deleting and to execute the sufficient recording to the high holding force recording media by combining and unifying three pairs of the substrate adhered by the prescribed magnetic thin film respectively. CONSTITUTION:The first nonmagnetic substrate 11 in which the one side surface is of V-type and a soft magnetic coat is coated to the part, the second nonmagnetic substrate 13 to coat the same soft magnetic coat 14 as the substrate 11 and a soft magnetic coat 15 even at other side flat surface and the third nonmagnetic substrate 16 to coat a soft magnetic coat 17 on one side are respectively combined and integrated by glass materials 18 and 20 through an operating gap 19 for recording and reproducing and an operating gap 21a for deleting between films 12 and 14, and 15 and 17 respectively. By such a constitution, the interval with gaps 19 and 21a comes to be short, the time gap of the recording and the deleting comes to be smaller, and the recordable data area comes to be large. By the magnetic core of the soft magnetic thin film of the high saturated magnetic flux density, the recording to the high coercive force recording media is satisfactorily executed and the recording density is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic head that integrates a recording/reproducing head and an erasing head, and is suitable for a recording/reproducing device for magnetic disks such as floppy disks and electronic cameras.

[Background of the invention]

With the recent increase in density and capacity of magnetic recording devices, there is a tendency to use high coercive force recording media such as metal powder in order to improve the recording density in the running direction of the magnetic recording medium. In this case, there is a problem in that a conventional magnetic head having a core formed of ferrite cannot perform sufficient recording. To solve this problem, a magnetic head using a multilayer soft magnetic thin film has been proposed.

In addition, in addition to regulating the signals recorded by the recording/playback head to a predetermined track width, during playback (□), in order to prevent crosstalk between adjacent tracks,
It is necessary to integrate the erasing head with the recording/reproducing head formed of the soft magnetic thin film.

For this purpose, a magnetic head having a structure as described in Japanese Unexamined Patent Publication No. 59-185015 has been proposed. This is shown in FIG.

The magnetic head shown in FIG. 1 includes a first core 1 for recording and reproduction, and a second core 1 for erasing connected in series with the first core 1 for recording and reproduction. It consists of a third head core 2. Reference numerals 3 and 3' denote nonmagnetic protective members for the respective henodontic cores, and the opposing portions of the respective core halves form protrusions. Soft magnetic thin films 4, 4' and 5, 5' with high saturation magnetic flux density are adhered to both sides of this protrusion. In Henodo Core 1 for recording and playback,
The abutting portions of 4 and 4' are ground to form a recording/reproducing working gear 6, and are fused and filled with glass 7 via a non-magnetic gap material and joined together. Also, in the erasing head core 2, soft magnetic thin films formed on both sides of each pair of substantially V-shaped protrusions are joined by a glass 8 through a non-magnetic gap material, and an erasing operating gap 9 is formed.
and 9'. These recording/reproducing and erasing cores 1 and 2 are connected in series at 10 to form a magnetic head.

Since such a conventional magnetic head uses a soft magnetic thin film with a high saturation magnetic flux density, it is possible to perform sufficient recording even on a high coercive force recording medium. However, since the soft magnetic thin film 5 constituting the magnetic circuit for erasing is formed in a substantially V-shape as in the case for recording and reproducing, the gap interval for recording and reproducing and for erasing becomes long. Because of this gear spacing.

A time lag occurs between data recording and erasing on the recording medium, and data can be reproduced after erasing is completed. For this reason, a buffer area is provided on the track to absorb the time h between recording and erasing and adjust the timing of switching between recording and playback. Need to be bigger.

This causes the inconvenience that the area for recording data is reduced accordingly.

In the conventional magnetic head shown in Fig. 1, in order to shorten the gap distance, it is conceivable to shorten the left side of the eraser head 20 as shown in Fig. 2, but in this case, recording/reproducing 3. In addition to the non-magnetic protection member 5, the soft magnetic thin film is also exposed at the joint 10 with the throat core 1, and a plurality of parts made of different materials appear at the joint, making joining difficult. Additionally, there is a risk that cracks may occur due to differences in the coefficient of thermal expansion of each material.

[Purpose of the invention]

The present invention solves the above problems, makes it possible to set the interval between the recording/reproducing gap and the erasing gap short, and improves recording density, making it possible to sufficiently record even on high coercive force recording media. The purpose of the present invention is to provide a magnetic head with a high quality.

[Summary of the invention]

In order to achieve the above object, the present invention has a first non-magnetic substrate having a V-shaped cross-sectional shape and a soft magnetic thin film coated on the side surface of the V-shaped part, and a first non-magnetic substrate having one side flat and 5 having soft magnetic surfaces on both sides. A second non-magnetic substrate coated with a magnetic thin film and a sixth substrate made of a non-magnetic material or a magnetic material coated with a soft magnetic thin film on one side are respectively placed in the running direction of the magnetic recording medium through a magnetic gap material. By connecting and gluing them together, a magnetic head 4 is constructed.

In the above magnetic head, the portion consisting of the first and second non-magnetic substrates constitutes a recording/reproducing head, and the portion consisting of the second non-magnetic substrate and third substrate constitutes an erasing head.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 3 and 4 show a perspective view and a plan view of a magnetic head according to the first embodiment.

In FIGS. 3 and 4, 11 is a first non-magnetic substrate on which a soft magnetic thin film 12 with high saturation magnetic flux density is adhered, and 13 is a first non-magnetic substrate with one side (left side in the figure) flat ↑ and soft magnetic on both sides. A second non-magnetic substrate with thin films 14 and 15 deposited thereon. Further, reference numeral 16 denotes a fifth substrate made of a non-magnetic material and having a soft magnetic thin film 17 coated on one side.

The non-magnetic material of the first, second and third substrates is made of glass, non-magnetic ferrite or ceramic, and the soft magnetic thin films 12, 14, 15, 17 are made of Nanadasu t or amorphous.

These soft magnetic thin films are deposited by sputtering, vapor deposition, or the like. In addition, if necessary, a soft magnetic thin film and 5r02
Alternatively, non-magnetic interlayer materials such as AQ, O, etc. may be alternately laminated to form a multilayer film.

Non-magnetic substrate 1 with one side formed into an R-shape by machining etc.
After a soft magnetic thin film is applied to 1.13, the abutting portions are polished, and a working gap 19 for recording and reproduction is formed by melting and filling glass 18 through a non-magnetic gap material and joining.

After machining the sixth substrate 16 as shown in FIGS. 5 and 4, a soft magnetic thin film 17 is attached to the left side of the figure, and the second Non-magnetic substrate 1
3 and glass 20 through a non-magnetic gap material 1 to 1 to form erasing operation gaps 21a and 21b.

Also, 22.23 is the winding window, and the winding coil 24.25
are wrapped around each other.

As described above, since a soft magnetic thin film with a high saturation magnetic flux density is used, sufficient recording is possible even on high coercive force recording media such as metal powder, and high density can be achieved. Further, one side of the second non-magnetic substrate constituting the erasing head is attached to the third and fourth
As shown in the figure, since it is formed flatly 17, shortening the gap distance becomes an EJ function, and recording tracks are provided to adjust the time lag between recording and erasing caused by the gap distance. The upper buffer area can be reduced. This makes it possible to increase the area in which data can be recorded. In addition, recording gap 19
and the erasing gaps 21a and 21h are filled with non-magnetic material 13.
Even if the gap interval is short (7), there is no problem of crosstalk.

Next, a second embodiment of the present invention is shown in FIG. In FIG. 5, a first non-magnetic substrate 11. The recording/reproducing head composed of the second non-magnetic substrate 13 is the same as that in the first embodiment. The third substrate constituting the erasing head is made of a magnetic material such as ferrite, and one side (the left side in Fig. 5) is machined into the ridge J in Fig. 5 through a non-magnetic gap material.
7. The second non-magnetic substrate 13 and the glass 27 are bonded by melting and filling (~, operating gap 28α for erasing).

Forms 2Bb. In the magnetic head having the structure shown in FIG. 5, the same effects as in the first embodiment described above can be obtained.

Next, a third embodiment of the present invention is shown in FIG. In FIG. 6, the first non-magnetic substrate 11 and the third substrate 16 are the same as those in the first embodiment shown in FIGS. 3 and 4. In FIG. 6, reference numeral 29 is a non-magnetic material on which one side (the left side in FIG. 6) has been processed as shown in the figure, and then a soft magnetic thin film 30 is attached thereto. The magnetic substrate 11 is bonded to the glass 31 to form an operating gap 32 for recording and reproducing. Depending on the shape of the second non-magnetic substrate 29 as shown in FIG. The same effects as in the example can be obtained.

FIG. 7 shows a fourth embodiment of the present invention. In Figure 7,
The first nonmagnetic substrate 11 is shown in FIGS. 5, 4, and 8.

Similarly to the first embodiment shown in FIG. 6, and similarly to the third embodiment shown in FIG.
The structure is similar to that of the second embodiment shown in the figure, and each is connected in the running direction of the magnetic recording medium.

A magnetic head may also be configured.

As described above, in the present invention, since a magnetic head is constituted by three substrates: the first and second non-magnetic substrates and the third substrate made of magnetic or non-magnetic material, there are fewer bonding steps, and the recording/reproducing head It is easy to integrate the erasing head and the erasing head, and the effect of improving the alignment accuracy can also be obtained.

〔Effect of the invention〕

As described above, according to the present invention, since the magnetic core is formed of a soft magnetic thin film with a high saturation magnetic flux density, sufficient recording is possible even on high coercive force recording media such as metal powder, and high recording is possible. Densification is possible. In addition, the recording/reproducing operation gap and the erasing operation gap are made of non-magnetic material.
Non: Because one side of the magnetic material is processed flat.

It becomes possible to shorten the gap interval. Than this,
The buffer area on the track is made smaller to adjust the time lag between recording and erasing caused by the distance between the gaps.
This has the effect of increasing the recordable data area.

[Brief explanation of drawings]

1 and 2 are plan views of a conventional head, FIGS. 3 and 4 are perspective views and plan views showing a first embodiment of the present invention, and FIGS. 5, 6, and 7 are are the second. of the present invention, respectively. FIG. 7 is a plan view showing third and fourth embodiments. 11.13, 16.29...Song/Non-magnetic material 1
2, 14.15.17.50...Soft magnetic thin film 18
．． 20,27.31・・・・・・・・・Glass 2
6・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・Magnetic material 19.32・・・・・・・・・
・・・・・・・・・・・・・・・ Recording/reproducing working gap 21a, 21A, 28α, 2.8A-Erasing working gap 22.23・・・・・・・・・・・・・・・・・・
Winding windows 24, 25 for...
・・・・・・・・・・・・・・・・・・Winding coil・
11 ・$3 layer $4 figure purchase 7 figure

Claims (1)

[Claims] 1. A first non-magnetic substrate having a V-shaped cross section and having a soft magnetic thin film adhered to the side surface of the V-shaped portion, and a first non-magnetic substrate having at least one side flat and a soft magnetic thin film on both sides. A second non-magnetic substrate coated with a soft magnetic thin film and a third substrate made of a non-magnetic material or a magnetic material coated with a soft magnetic thin film on one side are connected in the running direction of the magnetic recording medium and are integrated. magnetic head. 2. In the above magnetic head, the recording/reproducing head is formed by the first and second non-magnetic substrates coated with soft magnetic thin films;
The magnetic head according to claim 1, wherein the erasing head is constructed by bonding the soft magnetic thin film adhered to the flat portion of the second non-magnetic substrate and the fifth substrate. .