JPH0573836A - Multi-track magnetic head and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a multi-track magnetic head which is suitable for recording and reproducing signals of a high transmission rate such as a high definition VTR or a digital VTR and in which crosstalk between adjacent tracks is made little. CONSTITUTION:In a ring type magnetic head whose constitution is that both sides of a metalic magnetic film 1 is nipped with non-magnetic substrates 2, plural head chips are mutually adhered on the end faces in a travelling direction and mounted on one head base 5. The azimuth of the adjacent head chips is an inverse azimuth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-track magnetic head suitable for recording / reproducing high-signal transfer rates such as high-quality VTRs and digital VTRs, and having less crosstalk between adjacent tracks, and a method of manufacturing the same. is there.

[0002]

2. Description of the Related Art In recent years, systems for handling wide band signals such as high definition VTRs and digital VTRs have been actively developed. In order to record / reproduce this wide band signal, research has been conducted on increasing the relative speed between the tape and the head and increasing the number of tracks on the head.

Conventionally, the multi-tracking of the head has been performed by mounting a plurality of head chips on one head base, and the head height of each head chip from the head base and the gap distance are high. Where precision is required, we are trying to achieve it by accurately controlling the dimensions of each head. Further, in order to reduce the crosstalk between adjacent tracks, the azimuths of the adjacent heads are reverse azimuths.

[0004]

In the conventional multi-track magnetic head, when a plurality of head chips are mounted on one head base, even if the dimensions of each head are accurately controlled, the head base is Due to variations in the thickness of the adhesive that adheres the chip to the substrate and variations in the inclination of the chip, it was difficult to keep the accuracy of the track height and the gap distance within 1 μm. Also, when running on tape, tape powder gets stuck in the gaps between the heads,
There were many practical problems such as the heads subtly moving after running for a long time and the track height and the gap distance changed.

[0005]

In order to solve the above-mentioned problems, the multi-track magnetic head of the present invention has a plurality of head chips of a ring type magnetic head having a structure in which both sides of a metal magnetic film are sandwiched between substrates. The magnetic heads are attached to one head base by being adhered to each other at their end faces, and the azimuth of adjacent head chips is reverse azimuth.

The method of manufacturing the head comprises the steps of cutting a plate having both sides of a metal magnetic film sandwiched between substrates to form a plurality of pairs of core halves, and winding grooves on at least one of the core halves. And a step of processing the magnetic gap surface or the core end surface so that the angle formed by the magnetic gap surfaces of the plurality of pairs of core halves and the core end surface becomes the azimuth angle,
A plurality of pairs of core halves are bonded together on the magnetic gap surface to form a plurality of gapd bars, each track of the plurality of gapd bars has a predetermined track height, and the azimuths of adjacent gapd bars become reverse azimuths. It is characterized in that it has a step of adhering the end faces of each gapd bar so as to form one multi-gapped bar and a step of processing this multi-gapped bar into a multi-track head chip.

Alternatively, in the method of manufacturing the head, a step of cutting a plate in which both sides of a metal magnetic film are sandwiched by substrates to produce a plurality of pairs of core halves, and a winding groove is provided in at least one of the core halves. Forming a plurality of gap halves by adhering a plurality of pairs of core halves at the magnetic gap surfaces, and making an angle between the magnetic gap surfaces and the end surfaces of the plurality of gap burs to be an azimuth angle. And the step of processing the end faces of the gapd bars, and each track of the plurality of gapd bars has a predetermined track height, and the end faces of the adjacent gapd bars are bonded so that the azimuths of the adjacent gapd bars become reverse azimuths. And a step of processing the multi-gapped bar into a multi-track head chip.

[0008]

In the multi-track magnetic head of the present invention, since a plurality of head chips are adhered at the end faces, there is no gap between the head chips, and the relative track height and the gap-to-gap distance after head tape running. There are no problems such as changes. Since the azimuths of the adjacent heads are reverse azimuths, the crosstalk between adjacent tracks is small.

In the method of manufacturing a magnetic head according to the present invention, each end of each gapd bar is bonded so that each track of the plurality of gapd bars has a predetermined track height and the azimuths of the adjacent gapd bars are reverse azimuths. Since only one multi-gap bar is manufactured, the track height of each head chip of the multi-track magnetic head manufactured by this manufacturing method is accurately determined, and the azimuth of the adjacent head chips becomes the reverse azimuth. In the manufacturing method of the first invention, in the step of processing the magnetic gap surfaces or the core end surfaces so that the angle formed by the magnetic gap surfaces and the core end surfaces of the plurality of pairs of core halves is the azimuth angle, By accurately controlling the height of the magnetic gap from the end face of the core and adjusting the thickness of the adhesive layer on the end face of each gapd bar, the gap distance between the head chips can be accurately determined. Further, in the manufacturing method of the second invention, in the step of processing the gapd bar end surface so that the angle formed by the magnetic gap surfaces of the plurality of gapd bars and the gapd bar end surface becomes the azimuth angle, Accurately manage the height of
Further, by adjusting the thickness of the adhesive layer on the end surface of each gapd bar, the gap distance between the head chips can be determined with high accuracy. Furthermore, in the manufacturing methods of the first and second inventions, the number of multi-track magnetic heads manufactured from one multi-gap bar is adjusted by adjusting the size of the substrate so that the longitudinal direction of the core half becomes longer. Can be increased. That is, according to the manufacturing method of the present invention, it is possible to mass-produce a multi-track magnetic head in which the azimuth of adjacent head chips is reverse azimuth.

[0010]

EXAMPLE A first example of a multi-track magnetic head according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a multi-track magnetic head in which four head chips are mounted on one head base 5. A structure in which both sides of a metal magnetic film 1 such as an amorphous metal magnetic film or a sendust film is sandwiched between non-magnetic substrates 2 such as magnesium titanate-based ceramics or crystallized glass 4
The individual head chips are adhered to each other at end faces adjacent to each other in the traveling direction of the head chips via an adhesive layer such as glass.
The azimuths of adjacent head chips are opposite azimuths.

A coil 6 is wound around the winding window 4 and mounted on a head base 5 made of metal or ceramics.

FIG. 2 is a view of the multi-track magnetic head as seen from the tape sliding surface. The magnetic core made of the metal magnetic film 1 is arranged substantially parallel to the head traveling direction 7. h1 to h4 are track heights from the head base bonding surface 10 of each head chip. This track height is
Since the track height of each head chip can be adjusted to a predetermined track height when the end faces of the gap bars are bonded during the head manufacturing process, it is accurately determined. Further, the gap distance g between the head chips is also accurately determined at the time of manufacturing the head by adjusting the height of the magnetic gap 3 of each core half from the core end surface and the thickness of the adhesive layer on the core end surface. Further, the angle θ (azimuth angle) formed by the magnetic gap end and the perpendicular line 8 in the head traveling direction 7 on the medium surface is opposite in the adjacent head chips. As a result, the crosstalk between adjacent tracks was reduced, and a multi-track magnetic head with good characteristics was realized.

FIG. 3 is a view of the multitrack magnetic head of the second embodiment of the present invention as seen from the tape sliding surface.
The magnetic core made of the metal magnetic film 1 is arranged non-parallel to the head traveling direction 7. The track height and the gap distance are accurately determined as in the first embodiment, and the azimuths of the adjacent head cores are also reversed. In this head, since the magnetic core made of a metal magnetic film is arranged non-parallel to the head traveling direction, uneven wear between the metal magnetic film and the non-magnetic substrate after tape running of the head is small,
It was found that the characteristics were stable even after running for a long time.

FIG. 4 is a view of a multi-track magnetic head of another embodiment of the present invention as seen from the tape sliding surface.
FIG. 4A shows a structure in which each head chip is sandwiched between the nonmagnetic substrate 2 on one side of the metal magnetic film 1 and the ferromagnetic oxide substrate 11 such as ferrite on the other side, and the substrates facing each other at the magnetic gap surface are different from each other. With the multi-track magnetic head of
FIG. 4B shows a multi-track magnetic head having a structure in which each head chip is sandwiched by ferromagnetic oxide substrates 11 such as ferrite on both sides of the metal magnetic film 1 and the track width is regulated by the track width regulating glass 12. .. Even if each head chip had a structure as described above, the effect of the present invention was not impaired, and a multi-track magnetic head having good characteristics could be realized.

Next, a method of manufacturing the multi-track magnetic head of the first invention will be described. FIG. 5 shows a first embodiment of the method for manufacturing a multi-track magnetic head of the first invention.

First, a metal magnetic film 1 such as an amorphous metal magnetic film or a sendust film is formed on one surface of a non-magnetic substrate 2 such as magnesium titanate-based ceramics or crystallized glass by a thin film forming technique such as sputtering. Another non-magnetic substrate paired with the film is adhered via the adhesive glass 13 to prepare a plate in which both sides of the metal magnetic film are sandwiched by the non-magnetic substrate (FIG. 5a). Next, this plate is cut in a direction perpendicular to the metal magnetic film at a predetermined interval L to prepare a plurality of pairs of core halves (FIG. 5b). The winding window 4 is then formed in one of the pairs of core halves (FIG. 5c). Next, a plurality of pairs of core halves are adhered to the lapping plate 14 having a slanted surface with an azimuth angle θ, and the magnetic gap surface is polished.
The polishing amount at this time is adjusted so that the height d from the magnetic gap to the end surface of the core half is d = (g / 2) −δ (where δ is the thickness of the adhesive layer on the core end surface) (FIG. 5d). ).

Next, a gap material 15 made of SiO2 and adhesive glass is formed on the magnetic gap surfaces of the plurality of pairs of core halves, and an adhesive glass layer 16 is formed on the core end surface of the core halves to form a plurality of pairs of core halves. The body is bonded at the magnetic gap surface and the core end surface to make a multi-gap bar. At this time,
The track height from the head base bonding surface 10 of each gap bar is adjusted to a predetermined height h1 to h4. Further, the thickness of the adhesive layer on the end face of the core is also adjusted so that the gap distance between the gapd bars is a predetermined distance. Then, the adjacent gapd bars are bonded so that the azimuths thereof are reverse azimuths (FIG. 5e).

Next, both sides of the multi-gapped bar manufactured as described above are cut or polished to have a predetermined core width W (FIG. 5f). Next, this was cut to a predetermined head height H (Fig. 5g), the tape sliding surface was wrapped, and mounted on the head base, as shown in (Fig. 1) and (Fig. 2). A multi-track magnetic head having a structure in which a magnetic core made of such a metal magnetic film is arranged parallel to the head traveling direction is completed.

With this manufacturing method, it is possible to mass-produce a multi-track magnetic head in which the azimuth of adjacent head chips is reverse azimuth. Further, the track height from the head base and the distance between the gaps are also high in accuracy, and the manufacturing yield of the head is significantly improved as compared with the conventional case. Further, instead of simultaneously adhering to the magnetic gap surface and the core end surface of each core half body, first adhering to the magnetic gap surface to make a plurality of gapd bars, and then adhering to the end surface of each gapd bar. Needless to say, there is no problem.

FIG. 6 shows a second embodiment of the method for manufacturing a multitrack magnetic head of the first invention. First, a plate in which a metal magnetic film produced by the same method as in the first embodiment is sandwiched between non-magnetic substrates is cut at a predetermined interval L to produce a plurality of pairs of core halves. The difference from the first embodiment is that
The cutting direction is not perpendicular to the metal magnetic film, but is inclined by the azimuth angle θ with respect to the normal line 17 of the metal magnetic film surface (FIG. 6a).

Next, the winding window 4 is formed on one of the plurality of pairs of core halves (FIG. 6b). Next, a plurality of pairs of core halves are bonded onto a lapping plate 14 having a slope inclined by an azimuth angle θ, and the magnetic gap surface is polished (FIG. 6c).

Next, a plurality of pairs of core halves are bonded together at the magnetic gap surface and the core end surface to produce a multi-gap bar. At that time, the azimuths of the adjacent gap bars are bonded so that the azimuths thereof are reverse azimuths. Then, both sides of the multi-gap bar manufactured as described above are cut or polished to have a predetermined core width W (FIG. 6d).

After that, the multi-track magnetic head is completed through the same steps as in the first embodiment.

The multi-track magnetic head manufactured by the manufacturing method of the second embodiment has a structure in which the magnetic core made of the metal magnetic film 1 as shown in FIG. 3 is arranged non-parallel to the head traveling direction 7. become. The multi-track magnetic head manufactured in the second embodiment also has almost no difference from the first embodiment in terms of accuracy and yield.

Next, the first embodiment of the method of manufacturing the multi-track magnetic head of the second invention will be described with reference to FIG.

First, a metal magnetic film 1 such as an amorphous metal magnetic film or a sendust film is formed on one surface of a non-magnetic substrate 2 such as magnesium titanate-based ceramics or crystallized glass by a thin film forming technique such as sputtering. Another non-magnetic substrate paired with the film is adhered via the adhesive glass 13 to prepare a plate in which both sides of the metal magnetic film are sandwiched by the non-magnetic substrate (FIG. 7A).

Next, this plate is cut so that the cutting direction is inclined by the azimuth angle θ with respect to the normal line 17 of the surface of the metal magnetic film, and a plurality of core halves are produced (FIG. 7b). The winding window 4 is then formed in at least one of the pairs of core halves (FIG. 7c). Then, the magnetic gap surfaces of the plurality of pairs of core halves are smoothly polished, the gap material 15 made of SiO2 and adhesive glass is formed on the magnetic gap surfaces, and the plurality of pairs of core halves are bonded together by the magnetic gap surfaces. The gap gap bar is prepared (FIG. 7d).

Next, the angle between the magnetic gap surface 9 and the end surface of the gapd bar at the end surfaces of the plurality of pairs of gapd bars becomes the azimuth angle θ, and the distance from the magnetic gap is d.
The processing line 18 is polished so that (d = (g / 2) −δ: where δ is the thickness of the adhesive layer) (FIG. 7e).

Next, a plurality of gapd bars are bonded together at the end faces of the gapd bars to produce a multi-gap bar. At this time, the head base bonding surface 1 of each gapd bar
The track height from 0 is adjusted to a predetermined height. Also, the thickness of the adhesive layer on the end face of the gapd bar is adjusted so that the gap distance between the gapd bar is a predetermined distance. Moreover, the adjacent azimuths of the gap bars are adhered so that the azimuths are reverse azimuths.

Next, both sides of the multi-gapped bar manufactured as described above are cut or polished to have a predetermined core width W (FIG. 7f). Next, this is cut to a predetermined head height, the tape sliding surface is wrapped,
A multi-track magnetic head mounted on a head base and having a structure in which a magnetic core made of a metal magnetic film as shown in FIGS. 1 and 2 is arranged parallel to the head traveling direction is completed. With this manufacturing method, it is possible to mass-produce a multi-track magnetic head in which the azimuth of adjacent head chips is reverse azimuth. Further, the track height from the head base and the distance between the gaps are also high in accuracy, and the manufacturing yield of the head is significantly improved as compared with the conventional case.

Next, a second embodiment (FIG. 8) of the method for manufacturing the multi-track magnetic head of the second invention is shown. First, a plate in which a metal magnetic film manufactured by the same method as in the first embodiment is sandwiched between nonmagnetic substrates is cut at a predetermined interval L,
Make multiple pairs of core halves. The difference from the first embodiment is that the cutting direction is perpendicular to the metal magnetic film (FIG. 8a).

Next, the winding window 4 is formed in one of the plurality of pairs of core halves (FIG. 8b). Then, the magnetic gap surfaces of the plurality of pairs of core halves are smoothly polished, the gap material 15 made of SiO2 and adhesive glass is formed on the magnetic gap surfaces, and the plurality of pairs of core halves are bonded together by the magnetic gap surfaces. A gapd bar is prepared (Fig. 8c).

Next, the end faces of the plurality of pairs of gapd bars form an azimuth angle θ between the magnetic gap surface 9 and the end faces of the gapd bar, and the distance from the magnetic gap is d.
The processing line 18 is polished so that (d = (g / 2) −δ: where δ is the thickness of the adhesive layer) (FIG. 8d).

Next, a plurality of gapd bars are bonded together at the end faces of the gapd bars to produce a multi-gapped bar. At this time, the azimuths of the adjacent gap bars are bonded so that the azimuths are reverse azimuths. Then, both sides of the multi-gap bar manufactured as described above are cut or polished to have a predetermined core width W (FIG. 8e).

After that, the multi-track magnetic head is completed through the same steps as in the first embodiment. The magnetic head manufactured in the second embodiment completes a multi-track magnetic head having a structure in which magnetic cores made of a metal magnetic film as shown in FIG. 3 are arranged non-parallel to the head traveling direction. The multi-track magnetic head manufactured in this example also had almost no difference from the first example in terms of accuracy and yield.

[0036]

According to the present invention, the track height of each head chip and the distance between gaps are determined with high accuracy, and a multi-track magnetic head with less crosstalk between adjacent heads and adjacent tracks can be easily obtained. Be done. Further, according to the manufacturing method of the present invention, the loss between adjacent tracks is
It enables mass production of reverse azimuth multi-track magnetic head with less power consumption.

[Brief description of drawings]

FIG. 1 is a perspective view of a multi-track magnetic head according to a first embodiment of the invention.

FIG. 2 is a view of the multi-track magnetic head according to the first embodiment of the present invention as seen from a tape sliding surface.

FIG. 3 is a view of a multi-track magnetic head according to a second embodiment of the present invention as seen from a tape sliding surface.

FIG. 4 is a view of a multi-track magnetic head according to another embodiment of the present invention as seen from a tape sliding surface.

FIG. 5 is a perspective view showing a first embodiment of the manufacturing method of the first invention.

FIG. 6 is a perspective view showing a second embodiment of the manufacturing method of the first invention.

FIG. 7 is a perspective view showing a first embodiment of the manufacturing method of the second invention.

FIG. 8 is a perspective view showing a second embodiment of the manufacturing method of the second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal magnetic film 2 Non-magnetic substrate 3 Magnetic gap 4 Winding window 5 Head base 6 Coil 7 Head running direction 8 Vertical line of head running direction 9 Magnetic gap surface 10 Head base adhesive surface 11 Ferromagnetic oxide substrate 12 Track regulation Glass 13 Adhesive glass 14 Lap surface plate 15 Gap material 16 Adhesive glass 17 Normal line of metal magnetic film 18 Processing line

Claims (4)

[Claims] 1. A magnetic head in which a plurality of head chips of a ring type magnetic head having a structure in which both sides of a metal magnetic film are sandwiched by substrates are adhered to each other at end faces in the traveling direction and mounted on one head base. The multi-track magnetic head is characterized in that the azimuth of adjacent head chips is reverse azimuth. 2. A step of cutting a plate in which both sides of a metal magnetic film are sandwiched between substrates to produce a plurality of pairs of core halves, and a step of forming winding grooves in at least one core half. A step of processing the magnetic gap surface or the core end surface so that the angle formed by the magnetic gap surface and the core end surface of the plurality of pairs of core halves becomes an azimuth angle, and a plurality of pairs of core halves are bonded by the magnetic gap surface to form a plurality of pieces. A plurality of gapd bars are formed, each track of the plurality of gapd bars has a predetermined track height, and the end faces of the gapd bars are bonded so that the azimuths of the adjacent gapd bars are reverse azimuths.
A method of manufacturing a multi-track magnetic head, comprising: a step of producing one multi-gap driver and a step of processing the multi-gap driver into a multi-track head chip. 3. The method of manufacturing a multi-track magnetic head according to claim 2, wherein the plurality of core halves are bonded at the magnetic gap surface and the end surfaces of the gap bars are bonded at the same time. 4. A step of cutting a plate in which both sides of a metal magnetic film are sandwiched by substrates to produce a plurality of pairs of core halves, and a step of forming winding grooves in at least one core half. A step of adhering a plurality of pairs of core halves with a magnetic gap surface to produce a plurality of gapd bars, and the gapd bar end surfaces so that the angle between the magnetic gap surfaces and the end surfaces of the plurality of gapd bars becomes an azimuth angle. The process of processing and each track of a plurality of gapd bars have a predetermined track height, and the end surfaces of the adjacent gapd bars are bonded so that the azimuths of the adjacent gapd bars are reverse azimuths, and one multi-gapd bar is formed. And a step of processing the multi-gap bar to form a multi-track head chip. ..