JPH087220A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head capable of reducing bleeding of recording by a guard band-less recording and with higher density. CONSTITUTION:Two pieces of core halves provided with magnetic material tracks 2 having track widths different from each other are abutted on each other and arranged so that the magnetic material tracks are confronted with each other provided with an azimuth through a gap material, and a part where the magnetic material tracks are confronted with each other through the gap material is defined an operation gap 4. Further, respective magnetic material tracks whose widths are different from each other in a gap opposite surface, and the narrow width magnetic material track is disposed oppositely while being biased against one end of the wide width magnetic material track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to magnetic recording, and more particularly to a magnetic head such as used in a VTR.

[0002]

2. Description of the Related Art FIG. 16 shows, for example, documents (National Technical Report Vol. 34, No. 6, Dec. 198).
It is a perspective view which shows the conventional laminated film magnetic head shown by 8). In the figure, 1 is a non-magnetic substrate, and 2 is a laminated film of a metal magnetic film and an insulating film (hereinafter referred to as a laminated magnetic film), which constitutes a magnetic track. 3 is a laminated magnetic film 2 and a non-magnetic substrate 1
The crystallized glass and 4 which are bonded to each other are the operating gaps, and the magnetic material tracks 2 are portions abutted against each other via the gap material. Reference numeral 5 is a fused glass, and 6 is a winding window. 1
00 is a magnetic head. The two core halves each having the magnetic track 2 formed on the non-magnetic substrate 1 are
The gap members are abutted against each other so as to face each other. Further, FIG. 17 shows, for example, Japanese Patent Laid-Open No. 61-33.
FIG. 11 is a perspective view showing another conventional magnetic head shown in Japanese Patent Publication No. 09-09, in which reference numeral 7 is ferrite, and the gap abutting surface has a trapezoidal protruding portion. Reference numeral 8 is a metal magnetic film deposited on the protrusion including the gap abutting surface. Two core halves, each of which has a protrusion with a trapezoidal protruding portion of the gap abutting surface, and the metal magnetic film 8 is adhered to the protruding portion, have their gap abutting surfaces protruded through a gap material. They are arranged so that they fit together.

Next, a method of manufacturing these magnetic heads will be briefly described. In the case of the multi-layer magnetic head of FIG. 16, a plurality of multi-layer magnetic films 2 formed on the non-magnetic substrate 1 are stacked as shown in FIG. This stacked joining block is cut into pieces according to the dotted line, and as shown in FIG. 19 (a), glass grooves for gap welding are formed in this piece to mold the welded glass 5 and then in FIG. 20 (a). After forming the winding window 6 as shown, the gap surface is polished. Next, a gap material is formed on the gap surface, and the gap material is formed as shown in FIGS.
As shown in FIG. 21 (b), another piece subjected to similar processing is welded to the welded glass to form an integral block as shown in FIG.

The method of manufacturing the magnetic head shown in FIG.
First, as shown in a perspective view in FIG. 22, a groove 10 and a winding window 6 serving as a prototype of a magnetic track are formed on a piece of ferrite 7 by machining. Next, as shown in a sectional view in FIG. 23, a metal magnetic film 8 is formed on this, glass 5 is filled in the groove portions other than the winding window, and the gap surface is polished. A gap material is formed on the two cores thus formed and welded by the welding glass 5 to form an integral block as shown in the perspective view of FIG. This block is cut by machining to form one head chip.

[0005]

In the conventional magnetic head shown in FIG. 16, the laminated magnetic films 2 formed separately on the two pieces are welded so that the track widths thereof match. However, due to the accuracy of machining, the accuracy of track alignment, the erosion of the magnetic track by the bonding glass, etc.
There are few cases where there is no track deviation, and in most cases there is a deviation as shown in FIGS. 25 (a) and 25 (b). as a result,
In addition to the operation gap 4 for recording / reproducing a signal, there is a gap edge that does not abut the facing magnetic material of the core, that is, the laminated magnetic film 2. When there is no azimuth, the angle θ formed by the side faces of the magnetic track 2 facing the gap abutting surface other than the operating gaps on the side of the operating gap 4 is 90 degrees. The angle θ shifts by the angle,
As shown in FIGS. 25A and 25B, the angle becomes an obtuse angle and an acute angle in accordance with the track shift direction. FIG. 26 shows that the holding force is 1 by the magnetic head having a track deviation of 1 μm.
Angle θ when recorded on MP tape of about 700 Oe
And the amount of bleeding are shown. This characteristic diagram shows the result when the side projecting due to the track shift is arranged on the trailing side (trailing side) of the magnetic head. In this way, the angle θ changes considerably near 80 degrees,
It can be seen that the amount of bleeding of the recording becomes considerably large when the value is smaller than the degree. Note that FIG. 27 is a simulation result of the amount of deviation at each angle θ, that is, the length of the protruding portion due to the track deviation and the maximum recording magnetic field.

According to these characteristic diagrams, for example, in the VHS type VTR whose azimuth is as small as 6 degrees, the acute angle is 84 degrees, so that there is almost no influence of the recording blur, but with the digitization in the future, the azimuth will be, for example, 20 degrees. It can be seen that when it is increased, the acute angle side becomes 70 degrees, and the recording blur becomes considerably large at about 1 μm. 28A and 28B show recording patterns when the angle θ is 110 degrees and 70 degrees, respectively. In the figure, S is a regular recording portion and N is a curved recording portion, that is, a recording blur. When the angle θ is 110 degrees, there is almost no recording blurring, whereas when the angle θ is 70 degrees, there is recording blurring. Also, FIG.
Similarly, FIG. 9 shows an example of the off-track characteristic of the magnetic head in which the track deviation occurs as shown in FIGS. The magnetic head used in FIG. 29 has an overall film thickness of 15 μm, a track deviation of 3 μm, an angle θ of an acute angle of 70 degrees, and an obtuse angle of 110 degrees.

Therefore, in order to reduce recording bleeding, a magnetic head having a large azimuth may be manufactured by determining the track deviation direction so that the angle θ becomes an obtuse angle as shown in FIG. 25 (a). To be As a specific manufacturing method, for example, the tolerance of the center of the magnetic body track 2 of the core opposite to the center of the magnetic body track 2 of the core on the one side is plus or minus 1 μm in the related art, whereas it is on the acute angle side. For example, −2 μm to +0 μm so as not to shift
As described above, the heads are manufactured by shifting the track centers of the magnetic materials of both cores and aligning the tracks. Even in the case of a magnetic head in which the magnetic track 2 is not parallel to the running direction of a recording medium such as a tape, the track deviation direction should be determined so that the angle θ becomes an obtuse angle as shown in FIG. Can be considered.

However, in order to shift to the obtuse angle side in this way, the tolerance of the track center is set to -2 from the beginning.
When it is shifted from μm to +0 μm, it is more likely that a magnetic head with a large amount of deviation of the magnetic material track 2 will be formed than when the track center is not shifted, which leads to a reduction in reproduction output and does not necessarily increase in characteristics. I can't say.

Further, in the case where the gap abutting surface as shown in FIG. 17 projects in a trapezoidal shape and the track width gradually increases from the operation gap 4 portion, even in the recording medium running direction even if there is no track deviation. On the other hand, since the lateral surface of the track next to the operation gap 4, that is, the side surface of the magnetic core is not parallel, the side surface of the metal magnetic film 8 on the trailing side (trailing side) of the head causes the lateral side of the gap near the gap as shown in FIG. The bent signal is recorded. Therefore, during reproduction, the phases of the regular recording portion S and the curved recording portion N are deviated, and the quality of the reproduction signal deteriorates.

Although the recording patterns shown in FIGS. 28 and 31 have only one recording track written, when actually recording on a recording medium such as a tape, as shown in FIG. Recording is performed while erasing the signal of, and a pseudo signal written in other than the operation gap remains, and the effective recording track width becomes narrow. Therefore, when the track width set on the device is narrow, a sufficient reproduction output cannot be obtained.

In a conventional laminated film magnetic head having a relatively wide magnetic material track width, the amount of magnetic material forming a magnetic circuit does not matter so much, but with an increase in recording density and miniaturization of the device. When the size of the head chip becomes smaller and the width of the magnetic material track 2 becomes smaller, the amount of the magnetic material of the core (C core) on the side where the winding window 6 is formed becomes extremely small, which is sufficient. Reproduction sensitivity cannot be obtained.

The present invention has been made in order to solve the above-mentioned problems of the conventional ones, and it is possible to reduce recording blur and perform guard bandless recording and magnetic recording at a higher density. The purpose is to provide.

[0013]

According to a first aspect of the present invention, there is provided a magnetic head, wherein two core halves having magnetic tracks having different track widths are opposed to each other with the magnetic tracks having azimuths. Thus, the operation gap is provided by arranging the magnetic material tracks in abutment with the gap material interposed therebetween, and the portion where the magnetic material tracks are abutted with each other through the gap material.

A magnetic head according to a second aspect of the present invention is
The two core halves having the magnetic material tracks formed are abutted with a gap material so that the magnetic material tracks face each other with azimuth, and the magnetic material tracks are abutted with each other via the gap material. In a magnetic head having an operating gap as a gap, the magnetic tracks have different widths on the gap facing surfaces, and the narrow magnetic tracks are arranged so as to be offset to one end of the wide magnetic tracks. Is.

According to another aspect of the magnetic head of the present invention,
In a magnetic head in which two core halves made of a magnetic material and having protrusions having a trapezoidal gap abutting surface are arranged such that the gap abutting surfaces abut each other via a gap member, the gap abutting is performed. At least one of the tangents on the side surface of the magnetic core at the portion where the surface and the side surface of the magnetic core intersect is substantially parallel to the medium running direction.

According to another aspect of the magnetic head of the present invention,
In a magnetic head in which two core halves made of a magnetic material and having protrusions having a trapezoidal gap abutting surface are arranged such that the gap abutting surfaces abut each other via a gap member, the gap abutting is performed. At least at one end of the surface, the angles formed by the side surfaces of both magnetic cores and the gap abutting surface are both in the range of 60 to 75 degrees.

[0017]

In the magnetic head according to the first aspect of the present invention, the magnetic tracks having different track widths are arranged in abutment with each other. Therefore, during manufacture, the abutment is carried out so that the narrow magnetic tracks fit within the wide magnetic tracks. All you have to do is easy. Furthermore, if the width of the magnetic material track forming the winding window is widened, it is possible to prevent the reproduction sensitivity from deteriorating even if the amount of magnetic material decreases due to the winding window. Moreover, the angle formed between the gap abutting surfaces other than the operation gaps existing on both sides of the operation gap of the wide magnetic track and the side surface of the narrow magnetic track facing each other is always an obtuse angle, and the side where the recording blur is small. Becomes Therefore, for example, if the obtuse angle side with less recording bleeding is arranged on the side of the recording medium where the magnetic material track previously recorded overlaps, the recording bleeding previously recorded with the acute angle side is the obtuse angle side with less recording bleeding. It is erased by being overwritten with. Therefore, it is possible to almost eliminate the influence of recording blur.

In the magnetic head according to the second aspect of the present invention, the width is different on the gap facing surface, and the narrow magnetic track is arranged so as to be offset to one end of the wide magnetic track. On one side, it is possible to obtain a magnetic head with almost no bleeding of recording due to track deviation. Therefore, for example, if the side with almost no recording blur is arranged on the side of the recording medium where the recording is performed in an overlapping manner, the previously recorded recording blur is overwritten on the side with almost no recording blur. It is erased by. Therefore, it is possible to almost eliminate the influence of recording blur.

In the magnetic head according to the third aspect of the present invention, at least one of the tangents to the side surface of the magnetic core at the portion where the gap abutting surface and the side surface of the magnetic core intersect,
Since it is configured to be substantially parallel to the medium running direction, the relative speed with the medium is 0 in the parallel portion, and pseudo signals are not written on the medium in this portion, and there is almost no recording blur. Therefore, for example, if the side with almost no recording blur is arranged on the side of the recording medium where the recording is performed in an overlapping manner, the previously recorded recording blur is overwritten on the side with almost no recording blur. It is erased by. Therefore, it is possible to almost eliminate the influence of recording blur.

In the magnetic head according to the fourth aspect of the present invention, since the angles formed by the side surfaces of both magnetic cores and the gap abutting surface are at least 60 to 75 degrees at least at one end of the gap abutting surface, recording is performed. Little bleeding. Therefore, for example, if the side with less recording bleeding is arranged on the side of the recording medium where the recording is performed overlapping with the previously recorded track, the previously recorded recording bleeding is overwritten on the side with less recording bleeding. Be erased. Therefore, it is possible to almost eliminate the influence of recording blur.

[0021]

【Example】

Example 1. FIG. 1 is a plan view showing a surface of a magnetic head according to an embodiment of the present invention as opposed to a medium. In the figure, 1 is a non-magnetic substrate, 2 is a magnetic track made of a laminated magnetic film, 4 is an operating gap, and 3 is glass which joins the laminated magnetic film 2 and the non-magnetic substrate 1. in this way,
Two core halves having magnetic material tracks 2 having different widths are abutted and arranged via a gap material so that the magnetic material tracks 2 face each other with azimuth, and the magnetic material tracks 2 are disposed via the gap material. This is a magnetic head in which the abutting portion serves as the operation gap 4. By configuring in this way, the magnetic material track 2 can be easily aligned as compared with the case where cores having the same magnetic material track width are abutted and gap welded. Even if the width of the magnetic material track 2 is narrow, the magnetic material track width that works as the operation gap 4 is likely to enter a predetermined value.

Further, as the recording density increases and the apparatus becomes smaller, the size of the head chip becomes smaller,
As the width of the magnetic material track 2 becomes smaller, the amount of magnetic material of the core (C core) on the side where the winding window 6 is formed becomes extremely small, and there is a possibility that sufficient reproduction sensitivity cannot be obtained. This can be prevented by widening the width of the magnetic track 2 on which the winding window 6 is formed.

Further, in the case of such a magnetic head in which the widths of the magnetic material tracks 2 are different in both cores, there are track shift surfaces on both sides of the operating gap 4 and the widths opposite to the gap abutting surfaces other than the operating gap. The pseudo signal is recorded on the side having an acute angle θ ₁ with the side surface of the narrow magnetic track 2 and the recording blur is less on the side having an obtuse angle θ ₂ . In particular, it is more effective to dispose the core having the small width of the magnetic track 2 on the medium outflow side, that is, on the trailing side of the magnetic head. FIG. 2 shows a schematic diagram of guard bandless recording. Since recording is performed with a track pitch width or a slightly wider track as described above, an overwritten portion will occur. Therefore, the magnetic head 10 of FIG.
By arranging the obtuse angle θ ₂ side of 0 on the side of the recording medium where the recording is performed overlapping with the previously recorded track, the recording blur previously recorded at the acute angle θ ₁ side is the obtuse angle θ ₂ side with less recording blur. It is erased by being overwritten with. Therefore, it is possible to almost eliminate the influence of recording blur. The arrow in the figure indicates the traveling direction of the magnetic head 100.

Example 2. FIG. 3 is a plan view showing a surface of a magnetic head according to another embodiment of the present invention that faces a medium. Thus, even in the case of the magnetic head in which the running direction of the recording medium, for example, the tape (indicated by an outline arrow in the figure) and the lateral surface of the magnetic material track 2 are not parallel, the magnetic material having different widths as in the first embodiment is used. If the track 2 is used, track alignment can be easily performed, so that even if the width of the magnetic track 2 is narrow, the track width that acts as an operating gap easily enters a predetermined value. Further, by arranging the obtuse angle θ ₂ side on the side where the recording is performed so as to overlap with the previously recorded track, it is possible to eliminate the influence of the recording blur on the recording pattern. Furthermore, if the width of the magnetic material track forming the winding window is widened, it is possible to prevent the reproduction sensitivity from deteriorating even if the amount of magnetic material decreases due to the winding window.

In the first and second embodiments, the laminated magnetic film 2 is used.
However, the present invention is not limited to this, and a single film may be used, or the non-magnetic substrate 1 may be a composite substrate of a magnetic material and a non-magnetic material. Further, regarding recording, since the gap end on the trailing side with respect to the traveling direction of the medium is strong, the effect is further enhanced by making the core having the wider width of the magnetic body the leading side of the medium traveling.

Example 3. Next, the invention according to claim 2 will be described. As in the magnetic head shown in FIG. 4, the widths of the magnetic tracks 2 are different on the gap facing surfaces, and the narrow magnetic tracks 2 are arranged so as to be offset to one end of the wide magnetic track 2 and offset. , Action gap 4
There is no bleeding of the recording due to the track deviation on the side 4a where the magnetic material track ends coincide with each other at one end. By using this magnetic head, if the side 4a without recording blur is arranged on the side of the recording medium where the recorded track overlaps, the side 4b where the end of the magnetic track is displaced is recorded first. The recorded blur is erased by overwriting on the side without recording blur. Therefore, it is possible to almost eliminate the influence of recording blur. Further, even on the side 4b where the end of the magnetic track is displaced, if the angle θ formed by the side face of the narrow magnetic track facing the gap abutting surface other than the operating gap 4 is an obtuse angle, this side. It is possible to almost eliminate the recording blur.

However, in practice, as shown in FIG. 4, it is difficult to align a narrow magnetic track to one end of the wide magnetic track. Therefore, for example, it may be formed as shown in FIG. In the figure, numeral 11 is a hole for controlling the track width of the magnetic body which is opened after welding. The manufacturing method of this head is almost the same as that of a normal laminated film head, but the laminated magnetic film 2 formed first is made thicker than the recording track width, and the operation gap 4 is formed by a method such as laser processing after gap welding. A hole 11 is formed in one side 4a of the track 2 of the laminated magnetic film including the holes so that both track ends are aligned and an operation gap 4 having a desired width is obtained. When the magnetic head is manufactured by such a processing method, the track gap side 4b beside the operation gap 4
Exists on only one side of the operating gap 4.

By using this magnetic head, if the side 4a where the track ends coincide with each other and almost no recording bleeding is arranged on the side of the recording medium where the track is recorded so as to overlap with the previously recorded track, the track end is first recorded. The recording bleeding recorded on the side 4b on which the deviation occurs is erased by being overwritten on the side without the recording bleeding. Therefore, it is possible to almost eliminate the influence of recording blur. Further, also on the side 4b where the track end portion is displaced, the angle θ formed by the side surface of the narrow magnetic track facing the gap abutting surface other than the operation gap 4 is formed.
If it is configured to have an obtuse angle, recording bleeding on this side can also be reduced.

In order to make the angle .theta. Obtuse, for example, when the core halves having the same magnetic track width are butted as in the embodiment of FIG. 5, the problem to be solved by the invention is solved. As described in detail in the above section, it is conceivable to determine the direction of track deviation so that the angle θ becomes an obtuse angle for manufacturing. Further, when the halves having different track widths are abutted to each other as in the case of the practical example 1, the hole 11 may be provided on the acute angle side.

Example 4. FIG. 6 is a plan view showing a medium facing surface of a magnetic head according to another embodiment of the present invention. In the figure, 12 is a mold glass having a melting point lower than that of the gap welding glass. In this example, the mold glass 12 is provided on the side where the abutting ends of the magnetic tracks 2 are aligned.
Is provided. An example of the manufacturing method of this embodiment will be described. 18 to 21 in the conventional example until the core half body is abutted through the gap material to form a welded block.
The method is the same as the method for manufacturing a normal laminated film head described using, but the thickness of the laminated magnetic film is set wider than the desired track width. The core formed into one body by this welding is shown in FIG.
As described above, the groove 14 is provided on one side of the magnetic body track 2 by machining to narrow the track. A glass having a melting point lower than that of the fused glass 1 is formed by forming, for example, a non-magnetic protective film by sputtering so that the glass does not erode the magnetic film 2.
2 is molded to fill the narrow track groove 14 and then cut into chips, the sliding surface is polished, and processed into a predetermined head.
At this time, if the mold glass 12 has the same wear characteristics as the non-magnetic substrate, there is no uneven wear and a stable head having good characteristics can be obtained.

Also in the case of this magnetic head, as in the case of the third embodiment, the side where the track ends coincide with each other and there is almost no recording blur, that is, the mold glass 12 side is overlapped with the track recorded on the front side of the recording medium. Place it on the side
On the side where the track ends are deviated, the angle θ formed between the gap abutting surface other than the operation gap 4 and the side surface of the narrow magnetic track facing the gap may be an obtuse angle.

In the case where the track width is processed later as in Examples 3 and 4, for example, as shown in FIG. 7, the volume of the magnetic material of the core can be made large and the track width is small. Even in such a case, it is possible to suppress a decrease in regeneration efficiency.

Example 5. FIG. 8 is a plan view showing the surface of the magnetic head according to the third embodiment of the present invention which faces the medium. In the figure, reference numeral 7 is a magnetic substance, for example, ferrite, and has a protrusion portion in which a gap abutting surface protrudes in a trapezoidal shape. Reference numeral 8 is a metal magnetic film deposited on the protrusion including the gap abutting surface. Two core halves, each of which is composed of a ferrite 7 having a protruding portion with a gap abutting surface protruding in a trapezoidal shape, and a metal magnetic film 8 adhered to the protruding portion, are abutted to each other via gap materials. They are arranged so as to form the operation gap 4 together. Further, the magnetic core side at the portion where the gap abutting surface and the side surface of the magnetic core intersect is configured to be substantially parallel to the medium running direction indicated by the white arrow. When the trapezoidal magnetic bodies processed by the narrow track grooves are butted against each other in this manner, the magnetic side portions of the magnetic body tracks are configured so as not to be inclined with respect to the medium traveling direction. At 30 degrees,
If the groove for forming the track before forming the metal magnetic film 8 is processed by a wheel having a tip angle of 60 degrees, the side surface of the magnetic body becomes parallel to the medium running direction when used as a head.

By making the running direction of the medium parallel to the side portion of the magnetic body, the relative speed at the side portion of the magnetic body becomes zero, and it is possible to prevent the pseudo signal from being written on the medium at this portion. In the present embodiment, this parallel portion is formed on the magnetic body on the side where the signal written immediately before is overwritten, and further on the trailing side (trailing side) of the gap with respect to the medium traveling direction. By arranging in such a manner, there is an effect that the influence of recording bleeding is eliminated and a wide effective track width can be obtained.

Example 6. If the azimuth angle is less than 30 degrees, the tip angle of the wheel becomes very small,
If low-frequency noise or the like is generated due to the groove shape in the portion away from the gap, using a wheel as shown in cross section in FIG. 9 results in a medium facing surface shape with small azimuth as shown in FIG. 10 and solves the problem. it can. In FIG. 9, T is a taper.

In each of the fifth and sixth embodiments described above, the side surfaces of the magnetic cores on both sides of the operating gap 4 are arranged to be substantially parallel to the medium running direction. In this case, if the side parallel to the medium running direction is arranged on the side of the recording medium on which the previously recorded track is overlapped and recorded, the previously recorded recording blur hardly occurs. It is erased by overwriting on the parallel side. Therefore, it is possible to almost eliminate the influence of recording blur.

Example 7. FIG. 11 is a plan view showing a surface of a magnetic head according to a third embodiment of the invention, which faces the medium. In the figure, reference numeral 11 is a hole for controlling the track width opened by a laser.
The side surface of the magnetic core at the portion where the gap abutting surface and the side surface of the magnetic core intersect is configured to be substantially parallel to the medium running direction indicated by the white arrow. When the hole 11 is formed with a curvature instead of a straight line at the portion where the gap abutting surface and the side surface of the magnetic core intersect, the tangent line of the side surface of the magnetic core should be substantially parallel to the medium running direction. To configure. In this manufacturing method, holes 11 are provided by laser processing in a block, for example, shown in FIG. 24, in which two cores have been gap welded in advance.

Also in this embodiment, as in the magnetic heads of the fifth and sixth embodiments, the side of the magnetic core which is substantially parallel to the medium running direction, that is, the side with almost no recording bleeding is the end of the recording medium. If it is arranged on the side where it is recorded so as to overlap with the recorded track, the previously recorded recording blur is erased by being overwritten on the side where there is almost no recording blur. Therefore, it is possible to almost eliminate the influence of recording blur.

In this embodiment, only one side surface of the magnetic core of the operating gap 4 is machined in parallel, but holes 11 may be provided on both sides. In this case, since a pseudo signal is not written from the beginning, more blurring occurs. Can be reduced. Further, the processing method is not limited to laser processing and may be another processing method such as mechanical processing or etching.

Example 8. FIG. 12 is a plan view showing a surface of a magnetic head according to an embodiment of the present invention, which faces a medium. In the figure, θ _{1 to} θ ₄ are angles formed by the side surface of the magnetic core and the gap abutting surface, respectively, and in this example, θ ₁ and θ ₂ are both 70 degrees, and θ ₃ and θ ₄ are both 60 degrees. Smaller than. In the present invention, recording bleeding is reduced by reducing the generated magnetic field strength by variously changing the angle formed by the side surface of the magnetic core and the gap abutting surface.

In FIG. 13, the angle between the track lateral surface (that is, the side surface of the magnetic core) and the gap abutting surface is θ ₁ ,
The relationship between recording blur and θ ₂ is shown. The tape used was a vapor deposition tape with Hc = 1700 Oe, and the recording wavelength was 10 μm. From this figure, it can be seen that at 60 degrees or more, the printing blur becomes almost negligible. On the other hand, as shown in FIG. 14A, when the angles θ ₁ and θ ₂ are 75 degrees or more, the soft magnetic characteristics such as relative permeability are deteriorated and the reproduction efficiency of the head is lowered. This is because the magnetic film 8 formed on the lateral surface of the track has a magnetically separated columnar structure. Therefore, by setting the angles of θ ₁ and θ ₂ between 60 degrees and 75 degrees, the reproduction efficiency is good, and moreover, Example 1
It is possible to obtain a recording pattern with less recording blur as shown in FIG. In addition, the characteristic diagram of FIG.
As shown in FIG. 14B, the substrate is tilted by φ to form a film of sendust having a thickness of 5 μm from the incident direction, and heat treatment is performed in vacuum at 650 ° C. for 2 hours.

Note that in FIG. 12, θ ₃ and θ ₄ are smaller than θ ₁ and θ ₂ , which has the effect of improving the reproduction efficiency, but in the case of an electromagnetic conversion system having a sufficient reproduction output, θ
₃ and θ ₄ may have the same values as θ ₁ and θ ₂ , in which case the left and right crosstalk amounts during playback will be almost the same, so tracking servo will be performed due to the difference in the servo signal strength of adjacent tracks. This is particularly advantageous in the case of an electromagnetic conversion system that does.

Example 9. In each of Examples 5 to 8 described above, the case where the invention according to claims 3 and 4 is applied to a magnetic head in which the metal magnetic film 8 is attached to the entire trapezoidal protrusion is described. In the so-called metal-in-gap type head, the magnetic film 8 is not necessarily required on the lateral surface of the track, and the magnetic head in which the magnetic film 8 is adhered only to the gap abutting surface, that is, the operation gap 4 portion is used. The inventions described in 3 and 4 can be applied, and the same effects as in the above-mentioned Examples 5 to 8 can be obtained. For example, when the invention of claim 4 is applied, the result is as shown in FIG. 15, and it is obvious that the same effect as in the case of the eighth embodiment shown in FIG. 12 can be obtained in this case as well. Further, even a ferrite head having no metal magnetic film 8 has the same effect.

[0044]

As described above, according to the first aspect of the invention, two core halves having magnetic tracks having different track widths are arranged so that the magnetic tracks are opposed to each other with azimuth. The magnetic tracks are arranged in abutting relationship with each other via the gap material, and the portion where the magnetic material tracks are abutted with each other via the gap material is used as the operation gap, so that the narrow magnetic material track can be accommodated in the wide magnetic material track. Since it suffices to butt, manufacturing becomes easy. Furthermore, if the width of the magnetic material track forming the winding window is widened, it is possible to prevent the reproduction sensitivity from deteriorating even if the amount of magnetic material decreases due to the winding window. Moreover, the angle formed between the gap abutting surfaces other than the operation gaps existing on both sides of the operation gap of the wide magnetic track and the side surface of the narrow magnetic track facing each other is always an obtuse angle, and the side where the recording blur is small. Becomes Therefore, for example, if the obtuse angle side with less recording bleeding is arranged on the side of the recording medium where the magnetic material track previously recorded overlaps, the recording bleeding previously recorded with the acute angle side is the obtuse angle side with less recording bleeding. It is erased by being overwritten with. Therefore, it is possible to almost eliminate the influence of recording blur.

According to the second aspect of the present invention, the two core halves having the magnetic material tracks formed thereon are butted with each other via the gap material so that the magnetic material tracks are opposed to each other with azimuth. In a magnetic head having an operating gap in a portion where the magnetic material tracks are abutted via a gap member, the magnetic material tracks have different widths on the gap facing surfaces, and are offset to one end of the wide magnetic material track. Since the narrow magnetic tracks are arranged to face each other, it is possible to obtain a magnetic head in which there is almost no recording blur due to track deviation on one side of the operating gap. Therefore, for example, if the side with almost no recording blur is arranged on the side of the recording medium where the recording is performed in an overlapping manner, the previously recorded recording blur is overwritten on the side with almost no recording blur. It is erased by. Therefore, it is possible to almost eliminate the influence of recording blur.

According to the third aspect of the present invention, two core halves, each of which is made of a magnetic material and has a protrusion having a trapezoidal gap abutment surface, are provided. In a magnetic head arranged to face each other, at least one of the tangents to the side surface of the magnetic core at the intersection of the gap abutting surface and the side surface of the magnetic core is substantially parallel to the medium running direction. Therefore, the relative speed with respect to the medium becomes 0 in the parallel portion, and the pseudo signal is not written on the medium in this portion, and the recording bleeding hardly occurs. Therefore, for example, if the side with almost no recording blur is arranged on the side of the recording medium where the recording is performed in an overlapping manner, the previously recorded recording blur is overwritten on the side with almost no recording blur. It is erased by. Therefore, it is possible to almost eliminate the influence of recording blur.

According to the fourth aspect of the present invention, two core halves made of a magnetic material and having a protruding portion whose gap abutting surface protrudes in a trapezoidal shape are provided. In the magnetic heads arranged so as to abut each other, at least one end of the gap abutting surface has an angle between the side faces of both magnetic cores and the gap abutting surface both in the range of 60 degrees to 75 degrees, so that recording bleeding is small. . Therefore, for example, if the side with less recording bleeding is arranged on the side of the recording medium where the recording is performed overlapping with the previously recorded track, the previously recorded recording bleeding is overwritten on the side with less recording bleeding. Be erased. Therefore, it is possible to almost eliminate the influence of recording blur.

[Brief description of drawings]

FIG. 1 is a plan view showing a surface of a magnetic head according to a first embodiment which faces a medium.

FIG. 2 is a schematic diagram showing a state of guard bandless recording using the magnetic head of FIG.

FIG. 3 is a plan view showing a surface of a magnetic head according to a second embodiment which faces a medium.

FIG. 4 is a plan view showing a surface of a magnetic head facing a medium for explaining the invention according to claim 2;

FIG. 5 is a plan view showing a surface of a magnetic head according to a third embodiment which faces a medium.

FIG. 6 is a plan view showing a surface of a magnetic head according to a fourth embodiment which faces a medium.

FIG. 7 is a perspective view illustrating a method of manufacturing the magnetic head of FIG.

FIG. 8 is a plan view showing a surface of a magnetic head according to a fifth embodiment which faces a medium.

9 is a cross-sectional view showing a wheel used for manufacturing the magnetic head of FIG.

FIG. 10 is a plan view showing a surface of a magnetic head according to a sixth embodiment which faces a medium.

FIG. 11 is a plan view showing a surface of a magnetic head according to a seventh embodiment which faces a medium.

FIG. 12 is a plan view showing a surface of a magnetic head according to an eighth embodiment which faces a medium.

FIG. 13 is a characteristic diagram showing the relationship between recording blur and the angles θ ₁ and θ ₂ formed by the side surface of the magnetic core and the gap abutting surface.

FIG. 14A is a characteristic diagram showing a relationship between a film-forming surface angle of a magnetic film and magnetic permeability, and FIG. 14B is an explanatory diagram illustrating a film-forming surface angle of a magnetic film on a substrate.

FIG. 15 is a plan view showing a surface of a magnetic head according to a ninth embodiment which faces a medium.

FIG. 16 is a perspective view showing a conventional laminated film magnetic head.

FIG. 17 is a perspective view showing another conventional magnetic head.

FIG. 18 is a perspective view illustrating a manufacturing process of the magnetic head of FIG.

FIG. 19 is a perspective view illustrating a manufacturing process of the magnetic head of FIG.

FIG. 20 is a perspective view illustrating a manufacturing process of the magnetic head of FIG.

FIG. 21 is a perspective view illustrating a manufacturing process of the magnetic head of FIG.

22 is a perspective view illustrating a manufacturing process of the magnetic head of FIG.

23 is a cross-sectional view illustrating the manufacturing process of the magnetic head of FIG.

FIG. 24 is a perspective view illustrating a manufacturing process of the magnetic head of FIG.

FIG. 25 is a plan view of a surface facing a medium for explaining how tracks are displaced on the gap abutting surface of the magnetic head of FIG.

FIG. 26 is a characteristic diagram showing a relationship between a track shift angle θ and recording blur.

FIG. 27 is a characteristic diagram showing the relationship between the amount of deviation at each angle θ and the maximum recording magnetic field.

FIG. 28 is a schematic diagram showing recording patterns when the angle θ is 110 degrees and 70 degrees.

FIG. 29 is a characteristic diagram showing off-track characteristics of a magnetic head having a track deviation.

FIG. 30 is a plan view of a surface facing a medium for explaining how tracks are displaced on a gap abutting surface.

FIG. 31 is a schematic diagram showing a recording pattern of the magnetic head of FIG.

FIG. 32 is a schematic diagram showing a recording pattern overwritten by a magnetic head having a track shift.

[Explanation of symbols]

 1 Nonmagnetic Substrate 2 Laminated Magnetic Film 3 Crystallized Glass 4 Operating Gap 5 Welding Glass 6 Winding Window 7 Ferrite 8 Metal Magnetic Film 10 Track Groove 11 Hole 12 Mold Glass 14 Groove

Claims (4)

[Claims] 1. Two core halves having magnetic tracks having different track widths are abutted and arranged via a gap material so that the magnetic tracks are opposed to each other with azimuth, and the magnetic tracks are A magnetic head that uses the gaps that are abutted against each other as the operating gap. 2. The two core halves on which magnetic tracks are formed are abutted with a gap material so that the magnetic tracks face each other with azimuth, and the magnetic tracks have gap materials. In the magnetic head in which the operation gap is a portion abutted with each other, each of the magnetic tracks has a different width on the gap facing surface, and the narrow magnetic track is biased toward one end of the wide magnetic track. A magnetic head characterized by being arranged. 3. A magnetic head in which two core halves each made of a magnetic material and having a protruding portion whose gap abutting surface protrudes in a trapezoidal shape are arranged such that the gap abutting surfaces abut each other via a gap material. In at least one of the tangent lines of the magnetic core side surface at the portion where the gap abutting surface and the side surface of the magnetic core intersect with each other, the magnetic head is configured to be substantially parallel to the medium running direction. . 4. A magnetic head in which two core halves made of a magnetic material and having protrusions whose gap abutting faces project in a trapezoidal shape are arranged such that the gap abutting faces abut each other via a gap material. 2. The magnetic head according to, wherein at least one end of the gap abutting surface has an angle between the side surfaces of both magnetic cores and the gap abutting surface within a range of 60 degrees to 75 degrees.