JPH0954909A - Magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to visually recognize the magnetic gap of a magnetic head and to mount the magnetic head to a rotary drum with high accuracy. SOLUTION: The magnetic gap (g) is formed by butting a pair of magnetic core half bodies 24 and 25 which are formed by superposing ferromagnetic metallic films 2 and nonmagnetic materials 1. This magnetic head is constituted by setting the contact width W4 at least at the magnetic gap forming end of the magnetic core half body on the retreat side for sliding with magnetic recording media smaller than the contact width W1 of the magnetic core half body 24 on the advance side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a video tape recorder (VTR) and a digital data recorder (R-).
The present invention relates to a magnetic head useful when mounted on a magnetic recording / reproducing apparatus capable of high-density recording such as DAT).

[0002]

2. Description of the Related Art For example, a VTR (video tape recorder)
In magnetic recording / reproducing apparatuses such as the above, recording signals are being made higher in density and frequency, and in response to the higher density recording, magnetic powders such as Fe, Co, and Ni are used as magnetic recording media.
A so-called metal tape using a powder of a ferromagnetic metal such as the above, a so-called vapor deposition tape in which a ferromagnetic metal material is deposited on a base film by vapor deposition, and the like have been used. Since this type of magnetic recording medium has a high residual magnetic flux density Br and a high coercive force Hc, the head material of the magnetic head used for recording and reproduction is also required to have a high saturation magnetic flux density Bs and a high magnetic permeability. Has been done.

On the other hand, along with the above-mentioned high-density recording, the recording track width to be recorded on the magnetic recording medium is being narrowed, and in response to this, the magnetic head having a very narrow track width is required. Has been done. Further, as the frequency band is widened, the gap is being narrowed, and in response to this, the gap between the magnetic heads is required to be extremely narrow.

Therefore, a so-called laminate type magnetic head has heretofore been proposed in which a ferromagnetic metal film serving as a magnetic core is adhered on a non-magnetic substrate such as ceramics and used as a track portion. This magnetic head has various advantages such that the track can be easily narrowed by controlling the thickness of the ferromagnetic metal film, and a strong magnetic head that can withstand high-speed sliding can be supplied.

[0005]

By the way, in such a laminated magnetic head, the visibility of the gap portion of the magnetic head is deteriorated due to the narrowing of the gap, and particularly in the magnetic head using a noble metal as the gap material. It becomes remarkable. Although a magnetic head used for a VTR or the like is mounted on a rotating drum with high accuracy, there is a problem that workability at the time of mounting is deteriorated due to the above-mentioned problems.

In view of the above points, the present invention provides a magnetic head which makes it easier to visually recognize the gap portion, improves workability when mounted on a rotary drum, and improves productivity. .

[0007]

The present invention provides a magnetic head having a magnetic gap formed by abutting a pair of magnetic core halves formed by stacking a ferromagnetic metal film and a non-magnetic material on each other. The contact width of the portion of the magnetic core half on the exit side of the medium sliding including at least the magnetic gap forming end is set to be smaller than the contact width of the magnetic core half on the entrance side.

The position of the magnetic gap can be easily visually recognized by making the contact width of the part including the magnetic gap forming end of the magnetic core half on the exit side smaller than the contact width of the magnetic core half on the entrance side. You can

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a magnetic head according to the present invention will be described below with reference to the drawings.

In the magnetic head of this embodiment, as shown in FIG. 1, magnetic core halves 24 and 25 are formed by sandwiching a ferromagnetic metal film 2 between a pair of nonmagnetic substrates 1 in the film thickness direction.
The magnetic core halves 2 are connected to each other via a gap spacer 10.
The end faces of the ferromagnetic metal films 2 facing the abutting faces of 4 and 25 are butted against each other, a magnetic gap g is formed between the abutting faces, and the magnetic recording medium (for example, magnetic tape) slides (hereinafter The width of hitting the magnetic recording medium of the magnetic core half 25 on the exit side (so-called exit side) of the tape sliding is called the width of the magnetic recording medium of the magnetic core half 24 on the entrance side (so-called entrance side) of the tape sliding. It is configured to be smaller than the width.

As a means for reducing the tape contact width of the magnetic core half on the exit side, as shown in FIG. 1, the ferromagnetic metal film 2 is formed on the non-magnetic substrate 1 on both sides of the tape sliding surface 14.
Forming a groove 9 parallel to. In the illustrated example, the groove 9 is formed over a predetermined length from the end portion (so-called magnetic gap formation end portion) where the magnetic gap g is formed, that is, the end side of the tape sliding surface 14 remains.

However, it is also possible to form the groove 9 over the entire length of the magnetic core half 25 from the magnetic gap forming end to the end. The top of the winding window 12 is filled with glass 13. Reference numeral 15 is a guide groove, and 16 is a groove for defining the width per tape.

Here, as shown in FIG. 2, the tape contact width of the magnetic core half body 14 on the entrance side of the tape sliding is W ₁ , the film thickness of the ferromagnetic metal film 2 is W ₂ , and the thickness of the non-magnetic substrate 1. Let W ₃ be W ₃ , the width of the magnetic core half 15 on the exit side of the tape sliding on the tape is W ₄ , and the thickness of the non-magnetic substrate 1 is H. W ₁ > W ₄ (W ₁ −W ₂ ) / 2 = W ₃ W ₃ × 0.7 ≦ H ≦ W ₃ × 0.9, W ₄ and H are set.

When H is larger than W ₃ × 0.9, it becomes difficult to visually recognize the magnetic gap described later, and H is W ₃ × 0.
Becomes smaller than 7, the ferromagnetic metal film 2 of a thickness W ₂ ratio W ₂ / H becomes too large and the thickness H of the non-magnetic substrate, poor wear resistance of the exit side of the magnetic core halves 25 Become.

Further, as shown in FIG. 3, the depth of the groove 9 is within the range up to the gap depth zero d ₀ . When the groove 9 is formed deeper than the gap depth zero d ₀ , the glass 13 flows out to the tape sliding surface, which causes inconvenience.
The groove 9 is formed so as to satisfy the above conditions.

According to the above-described embodiment, the magnetic core half 25 is formed by forming the grooves 9 parallel to the ferromagnetic metal film 2 on the nonmagnetic substrate 1 on both sides of the magnetic core half 25 on the exit side of the tape sliding. By setting the tape contact width W ₄ over the predetermined length including at least the magnetic gap forming end portion of the tape contact width W ₁ smaller than the tape contact width W ₁ of the magnetic core half on the entrance side of the tape sliding,
It becomes easy to visually recognize the position of the magnetic gap g. Therefore, the magnetic head can be mounted on the rotating drum with high accuracy, workability at the time of mounting can be improved, and productivity of the magnetic head can be improved.

Further, by forming the groove 9 so that W ₃ × 0.7 ≦ H ≦ W ₃ × 0.9, the position of the magnetic gap g can be visually recognized, and at the same time, the magnetic core half 25 can be formed. It is possible to avoid deterioration of wear resistance.

Further, by setting the depth of the groove 9 to the depth from the tape sliding surface 14 to the range of the gap depth zero d ₀ , the glass 13 does not flow out to the tape sliding surface at the time of glass fusion, A reliable magnetic head can be manufactured.

By increasing the tape contact width W ₁ of the magnetic core half body 24 on the entry side and the tape contact width W ₄ of the magnetic core half body 25 on the exit side to be small, the magnetic head is moved relative to the magnetic head during tape running. The magnetic tape can be run smoothly without getting caught.

Further, by narrowing only a part of the width of the magnetic core half 25 on the exit side against the tape as shown in FIG.
The magnetic tape can be run more smoothly.

Next, an example of a method of manufacturing the above magnetic head 21 will be described. First, as shown in FIG. 4, a ferromagnetic metal film 2 serving as a magnetic core is formed on one surface of a strip substrate 1 made of a non-magnetic material such as ceramics by a vacuum thin film forming method such as sputtering.

As the ferromagnetic metal film 2, (i) Fe-A
l-Si, Fe-Ni-Al-Si, Fe-Ga-S
i, Fe-Al-Ge, etc., and Co, Ti, Cr, Nb, Mo, Ta, Ru, Au, P of 8 atomic% or less.
A crystalline material containing one or more kinds of d, N, C, O, etc., (ii) Co mainly containing Zr, Ta, Ti, Hf, M
Amorphous material formed by adding one or more kinds such as o, Nb, Au, Pd, Ru, etc. (iii) Co, Fe mainly Ni, Zr, Ta, Ti, Hf, Mo, Nb,
One or more kinds of Si, Al, B, Ga, Ge, Cu, Sn, Ru, etc., and a microcrystalline material formed by adding one or more kinds of N, C, O, etc. are selected.

Next, as shown in FIG. 5, the ferromagnetic metal film 2
The magnetic core substrate 3 is formed by joining and integrating a plurality of strip substrates 1 on which the above are formed. This magnetic core substrate 3 is cut along the lines AA ', BB', and CC 'as shown in FIG. 5, and the pair of magnetic core half blocks shown in FIG. Form 4 and 5. In the case of the present embodiment, the cutting direction is perpendicular to the ferromagnetic metal film 2, but
It may be cut at an azimuth angle.

Next, as shown in FIG. 7, winding grooves 6 and 7 extending in the longitudinal direction are formed on the inner surfaces of the magnetic core half blocks 4 and 5 which face each other.

Then, as shown in FIG. 8, the surface 8 serving as the sliding surface of the magnetic core half block 5 on the exit side of the tape sliding is regulated so as to be parallel to the ferromagnetic metal film 2. The groove 9 is formed. The groove 9 is formed in the non-magnetic substrate 1 under the conditions described above. Next, the abutting surfaces 4a and 5a of the magnetic core half blocks 4 and 5 are smooth-polished.

Then, the gap spacer 1 is formed on either or both of the polished butted surfaces 4a and 5a.
0 is formed by a vacuum thin film forming method such as sputtering, and these magnetic core half blocks 4 and 5 are formed into respective ferromagnetic metal films 2.
Butt them so that they face each other.

Thereafter, as shown in FIG. 9, the magnetic core half blocks 4 and 5 are joined and integrated. As a result, a magnetic gap g that operates as a recording / reproducing gap is formed between the abutting surfaces of the ferromagnetic metal films 2 formed on the magnetic core halves 4 and 5, respectively. The winding window 12 is formed in the magnetic core block 11 that is joined and integrated.

Next, as shown in FIG. 10, with the surface of the magnetic core block 12 serving as the tape sliding surface facing downward, a rod-shaped glass 13 is inserted into the winding window 12 and heat-treated to fill the glass. To do.

Next, as shown in FIG. 11, a tape sliding surface 14 having a curvature is formed by lapping to a predetermined gap depth, and guide grooves 15 are formed on both sides of the magnetic core block 11. Here, the grooves 9 formed in the non-magnetic substrate 1 on both sides of the ferromagnetic metal film 2 have a predetermined length from the magnetic gap g so as to leave a part of the end portion on the magnetic core half body side on the exit side of tape sliding. It is formed over.

Next, as shown in FIG. 12, a contact width regulation groove 16 is formed on the tape sliding surface 14 side to regulate the contact width of the magnetic tape. After that, in the figure, DD 'and EE'
The magnetic head 21 shown in FIG. 1 is completed by cutting along the line.

Here, a conventionally known bonding method can be used for bonding the respective members. For example, a low temperature thermal diffusion bonding by thermal diffusion of the noble metal layers or a bonding method by glass fusing or the like can be used. Can be mentioned.

In the above embodiment, the non-magnetic strip substrate is used.
Laminated with a ferromagnetic metal film 2 formed on 1 as a single layer film
Applied to a magnetic head₂, Al
₂O _Three, Si_ThreeN_FourElectrical such as oxides and nitrides
Laminating a plurality of thin ferromagnetic metal films 2 through an insulating film
It can also be applied to laminated magnetic heads with a stacked multilayer structure.
Wear. This laminated magnetic head with a multilayer film structure
However, the grooves 9 under the above conditions are formed on the non-magnetic substrates on both sides.
Do like this.

[0033]

According to the present invention, the contact width of the part of the magnetic core half on the exit side of sliding of the magnetic recording medium including at least the magnetic gap forming end is smaller than the contact width of the magnetic core half on the entrance side. By doing so, the position of the magnetic gap can be visually recognized. Therefore, the magnetic head can be mounted on the rotating drum or the like with high accuracy, workability is improved, and productivity is improved.

The width H of the non-magnetic material outside the magnetic core half on the exit side and the width W ₃ of the non-magnetic material outside the magnetic core half on the entrance side.
By setting the relationship with W ₃ × 0.7 ≦ H ≦ W ₃ × 0.9, it becomes possible to visually recognize the magnetic gap and to avoid deterioration of wear resistance of the magnetic core half on the exit side. The depth of the groove formed to reduce the contact width of the magnetic core half on the exit side is set to a range up to the gap depth of zero to prevent the filling glass from flowing out to the sliding surface side during manufacturing. Therefore, it is possible to manufacture a highly reliable magnetic head.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a magnetic head according to the present invention.

FIG. 2 is a plan view of an essential part seen from the sliding surface side of the magnetic head used for explaining the present invention.

FIG. 3 is a side view of an essential part seen from a side surface of the magnetic head used for explaining the present invention.

FIG. 4 is a flow chart showing a process of manufacturing a magnetic head according to the present invention, which is a process diagram of forming a ferromagnetic metal film on a non-magnetic strip substrate.

FIG. 5 shows a manufacturing process sequence of a magnetic head according to the present invention, which is a process diagram of forming a magnetic core substrate by joining and joining a plurality of strip substrates having a ferromagnetic metal film formed thereon, and a magnetic core half body. It is a block cutting process drawing.

FIG. 6 is a process diagram showing a pair of magnetic core half blocks formed, showing the order of manufacturing steps of the magnetic head according to the present invention.

FIG. 7 is a process chart showing a manufacturing process sequence of a magnetic head according to the present invention, which is a process of winding a groove on a magnetic core half block and smoothing a groove forming surface.

FIG. 8 is a view showing the order of manufacturing steps of the magnetic head according to the present invention and is a process drawing of grooving one magnetic core half block.

FIG. 9 is a process chart showing the steps of manufacturing a magnetic head according to the present invention, in which a gap spacer and a magnetic core block are formed.

FIG. 10 is a process chart of filling the glass into the magnetic core block, showing the manufacturing process sequence of the magnetic head according to the present invention.

FIG. 11 is a process chart of forming the sliding surface and the guide groove of the magnetic core block, showing the order of manufacturing steps of the magnetic head according to the present invention.

FIG. 12 is a process chart showing the order of manufacturing steps of the magnetic head according to the present invention, which is a step diagram in which a contact width regulating groove is formed in the magnetic core block and the magnetic head core is cut out.

[Explanation of symbols]

 1 non-magnetic strip substrate 2 ferromagnetic metal film 3 magnetic core substrate 4,5 magnetic core half block 9 regulation groove 10 gap spacer 11 magnetic core block 12 winding groove 13 rod-shaped glass 14 tape sliding surface 15 guide groove 16 per Width regulation groove g Magnetic gap 21 Magnetic head 24, 25 Magnetic core half

Claims (3)

[Claims] 1. A magnetic head comprising a pair of magnetic core halves formed by stacking a ferromagnetic metal film and a non-magnetic material on each other to form a magnetic gap, the magnetic head being on the exit side of sliding of a magnetic recording medium. The contact width of a portion including at least the magnetic gap forming end portion of the magnetic core half body is set to be smaller than the contact width of the magnetic core half body on the entry side.
A magnetic head characterized in that 2. The width of the outermost non-magnetic material of the portion of the exit side magnetic core half where the contact width is small is H, and the width of the non-magnetic material outside the approach side magnetic core half is When W ₃ is satisfied, W ₃ × 0.7 ≦ H ≦ W ₃ × 0.9 is satisfied. The magnetic head according to claim 1, wherein: 3. The groove sets a contact width of a part of the magnetic core half on the exit side including at least a magnetic gap forming end smaller than a contact width of the magnetic core half on the entrance side.
The magnetic head according to claim 2, wherein the depth of the groove is in a range up to a gap depth of zero.