JPH05128419A - Magnetic head and production thereof - Google Patents

Abstract

PURPOSE:To prevent an increase in the length of a magnetic path formed of laminated layers while preventing this magnetic path from being shut off by the winding window of a C core. CONSTITUTION:This magnetic head is constituted by inserting the laminated layers 3 alternately laminated with magnetic metallic films 1 having a high saturation magnetic flux density and insulating thin films 2 with nonmagnetic material plates 4, 5 from both sides to constitute the C-shaped core 8 and joining and integrating such core and an I-shaped core 9. The laminated layers 3 alternately laminated with the above-mentioned magnetic metallic films 1 and the insulating thin films 2 are formed on the inside end face 27 of the winding window 16 formed on the joint surface 10 of the C-shaped core 8 with the I- shaped core 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head and a method of manufacturing the same, and more particularly, a TS used in a VTR device and having a structure in which metal magnetic films having a high saturation magnetic flux density are laminated.
The present invention relates to an S-type magnetic head and a method for manufacturing the same.

[0002]

2. Description of the Related Art For example, as a magnetic head used in a VTR device for high density recording, there is a TSS type magnetic head having a structure in which metal magnetic films having a high saturation magnetic flux density are laminated. 7A and 7B show a double azimuth type in which a pair of TSS type magnetic heads are mounted on one head base, and one of the magnetic heads is shown.

In this magnetic head, as shown in the figure, a magnetic metal film (1) such as sendust having a high saturation magnetic flux density and an insulating thin film (2) such as SiO ₂ or Al ₂ O ₃ are alternately laminated. Laminate layer (3) [Although not shown, a Cr film is interposed between the metal magnetic film (1) and the insulating thin film (2)]
A C-shaped core having a non-magnetic plate (4) (5) such as ceramic on one side of the laminate layer (3) and glass (6) (7) on the other side. (8) and the I-shaped core (9) [hereinafter referred to as the C core and I core] between the joining surfaces (10) and (11) of the non-magnetic thin film such as SiO _{2 serving as a} gap spacer [not shown]. It is the one that is joined and integrated through The C core (8) and the I core (9) are integrated by welding with the glasses (6), (7), (12) and (13).

A core chip (14) is obtained by joining and integrating the C core (8) and the I core (9), and the curved top end surface of the core chip (14) is in sliding contact with a medium on which a magnetic tape runs. The surface becomes the surface (15), and a magnetic gap g having a track width determined by the thickness of the laminate layer (3) is formed on the medium sliding contact surface (15). This magnetic gap g is protected from both sides by nonmagnetic plates (4) and (5) and glass (6) and (7). A winding window (16) is formed inside the C core (8) of the core chip (14), and a winding groove (17) is engraved on the outside thereof. A coil is formed by winding a wire material that has been subjected to an insulation coating using (16) and the winding groove (17).

Next, a method of manufacturing the magnetic head having the above structure will be described with reference to FIGS.

First, the C core (8) is manufactured as follows.
Be done. That is, as shown in (a) of FIG.
Prepare a non-magnetic plate (18). Then, as shown in FIG.
Insert the glass grooves (19) in the non-magnetic plate (18) as shown.
Fill the glass groove (19) with glass (12) after engraving.
It Then, flatten the non-magnetic plate (18) with the glass groove (19).
Line and carve a plurality of track grooves (20). Then figure
As shown in Fig. 9 (a), sendust is attached to the non-magnetic plate (18).
And a magnetic metal material having a high saturation magnetic flux density ₂Or A
l₂O₃Alternately covered with an insulating material such as by sputtering.
The metal magnetic film (1) in the track groove (20).
The laminated layer (3) in which the edge thin film (2) is laminated alternately
Track groove formed with the laminated layer (3)
(20) was filled with glass (6) by glass mold
Wrap on top. Although not shown, a metal magnetic film
A Cr film should be interposed between (1) and the insulating thin film (2).
Adhesion between the films is improved by and. next,
As shown in FIG. 9 (b), tracks are placed on the non-magnetic plate (18).
Engraving a plurality of winding window grooves (21) in a direction orthogonal to the grooves (20).
Installed on the opposite side and parallel to the winding window groove (21).
To form a plurality of winding grooves (not shown). And in the figure
The non-magnetic plate (18) is attached to the winding window groove (21) as shown by the chain line.
C by cutting to a specified dimension along the direction parallel to
A C core block (22) which is a base material of the core (8) is obtained.

On the other hand, the I core (9) is almost the same as the C core (8), and a glass groove (24) is formed in the non-magnetic plate (23) as shown in FIG. 10 (a). Then, the glass groove (24) is filled with the glass (13), and then the track groove (25) is formed in parallel with the glass groove (24). Then, as shown in FIG. 10 (b), a laminate layer (3) in which the metal magnetic film (1) and the insulating thin film (2) are laminated is formed in the track groove (25), and the track groove (25) is further formed. After filling the glass with the glass (7), the non-magnetic plate (23) is cut into a predetermined size along the direction orthogonal to the track groove (25) as shown by the chain line in the figure, so that the I core (9) is cut. The I core block (26) which becomes the base material of (1) is obtained.

A nonmagnetic thin film of SiO ₂ or the like (not shown) serving as a gap spacer is formed on the joint surface of either the C core block (22) or the I core block (26) obtained as described above. After depositing and forming, C core block (2
The joint surface of 2) and the I core block (26) are abutted against each other, and they are joined and integrated by welding with glass (6), (7), (12) and (13). After that, the C core block (22) and the I core block (26) that are joined and integrated are sliced into a predetermined size to obtain a core chip (14) shown in FIGS.

[0009]

By the way, in the above magnetic head, the magnetic path is formed by the laminate layer (3) in which the metal magnetic film (1) and the insulating thin film (2) are laminated. In the case of the magnetic head manufactured by the above-described manufacturing method, if the inclination angle θ of the laminate layer (3) with respect to the magnetic gap g is large as shown in FIG. 7B, the laminate layer (3)
There is a problem in that the magnetic path formed in (3) is blocked by the winding window (16) of the C core (8).

In order to solve this problem, if the inclination angle θ of the laminate layer (3) with respect to the magnetic gap g is made small, the magnetic path formed by the laminate layer (3) has a winding window (16) of the C core (8). However, the magnetic path becomes long and a large amount of metal magnetic material that constitutes the metal magnetic film (1) of the laminate layer (3) is required. Generally, as the metal magnetic material, since an expensive material such as sendust is used as described above, it is preferable that an increase in the usage amount of the metal magnetic material leads to a problem of increasing the product cost of the magnetic head. is not.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to prevent a magnetic path formed by a laminate layer from being blocked by a winding window of a C core, and SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic head in which the magnetic path does not become long and a method for manufacturing the magnetic head.

[0012]

As a technical means for achieving the above object, the present invention provides a non-magnetic material plate with a laminated layer in which a metal magnetic film having a high saturation magnetic flux density and an insulating thin film are alternately laminated. When manufacturing the above C core of the magnetic head in which the C core and the I core sandwiched from both sides are joined and integrated, a non-magnetic plate is engraved with a track groove having an inclined surface with a predetermined angle, A winding window groove is formed in the magnetic material plate in a direction orthogonal to the direction in which the track groove extends, and then a metal magnetic film and an insulating thin film are alternately laminated to form a laminate layer. To do.

Further, according to the present invention, a C core and an I core, in which a laminate layer in which a metal magnetic film having a high saturation magnetic flux density and an insulating thin film are alternately laminated, are sandwiched by nonmagnetic plates from both sides, are joined and integrated. In the magnetic head, a laminate layer in which the metal magnetic film and the insulating thin film are alternately laminated is formed on the inner end surface of the winding window formed on the joint surface of the C core with the I core.

Further, the winding window of the C core is trapezoidal,
In the winding window, it is desirable that the angle formed by the inner end surface of the C core adjacent to the joint surface with the I core and the joint surface is 30 to 45 °.

[0015]

In the present invention, the winding window groove is formed in the non-magnetic plate in the direction orthogonal to the direction in which the track groove extends, and then the metal magnetic film and the insulating thin film are alternately laminated to form a laminate layer. Therefore, the laminate layer is formed on the inner end surface of the winding window of the C core, and the magnetic path is formed with the laminate layer of the I core. As a result, the magnetic path formed by the laminate layer is not blocked by the winding window of the C core, and the inclination angle with respect to the magnetic gap of the laminate layer can be maintained at a predetermined value, and the magnetic path can be lengthened. Absent.

[0016]

Embodiments of a magnetic head and a method of manufacturing the same according to the present invention will be described with reference to FIGS. The same or corresponding parts as those in FIGS. 7 to 10 are designated by the same reference numerals, and a duplicate description will be omitted.

The characteristic feature of the magnetic head according to the present invention resides in the C core (8) as shown in FIGS.

That is, in the magnetic head of the first embodiment shown in the same figure, the I core (9) is the same as the conventional one, and therefore its explanation is omitted. C core of this magnetic head (8)
Is a laminated layer (3) [3] in which a metal magnetic film (1) such as sendust having a high saturation magnetic flux density and an insulating thin film (2) such as SiO ₂ or Al ₂ O ₃ are alternately laminated as shown in FIG. Although not shown, a Cr film is present between the metal magnetic film (1) and the insulating thin film (2)] is formed on the inner end face (27) of the winding window (16), and further glass (28) is formed. It is formed by deposition. The C core (8) and the I core (9) are core chips (1
Glass (6) (7) exposed on the medium sliding contact surface (15) of 4)
Together with (12) and (13), the winding window (16) is welded and integrated by glass (28). The glass (28) of the winding window (16) should be in contact with the laminate layer (3) when a coil is formed by winding a wire that has been insulation-coated on the core chip (14). Protect so that there is no. As a result, the laminated layer (3) exposed on the medium sliding contact surface (15), the laminated layer (3) of the winding window (16) of the C core (8) and the laminated layer (3) of the I core (9) are formed. Since the magnetic path is formed, the magnetic path is not blocked by the winding window (16). Therefore, as shown in FIG. 2, in the medium sliding contact surface (15) of the core chip (14), it is not necessary to reduce the inclination angle θ with respect to the magnetic gap g of the laminate layer (3), and a desired angle, for example, 30 to 30 can be obtained. The magnetic path can be set to 60 °, and the magnetic path is not lengthened, so that the amount of the metal magnetic material forming the metal magnetic film (1) of the laminate layer (3) is not increased.

Here, the winding window (16) is preferably trapezoidal as shown in the figure, and further, the inner end surface (27) adjacent to the joint surface (10) of the C core (8) with the I core (9) is formed. The joint surface (10)
The angle δ formed with is preferably 30 to 45 °. This angle δ is 30
If the angle is less than °, it becomes difficult to wind the wire because the opening area of the winding window (16) is reduced, and conversely, if the angle δ is greater than 45 °, the magnetic head to be described later is manufactured. Moreover, it becomes difficult to set the thickness of the laminate layer (3) formed of the metal magnetic film (1) and the insulating thin film (2) formed on the inner end surface (27) of the winding window (16) to a predetermined value. ..
Note that the angle δ formed by the inner end surface (27) adjacent to the joint surface (10)
Is 30 to 45 °, the angle ψ between the inner end face (27) and the central inner end face (27) adjacent thereto is 135 to 150 °.

Next, a method of manufacturing the magnetic head of the above-described first embodiment will be described with reference to FIGS.

First, the C core (8) is manufactured as follows. That is, as shown in FIG. 2A, a nonmagnetic plate (18) such as ceramic is prepared. Then, as shown in FIG. 2B, a plurality of glass grooves (19) are engraved in the non-magnetic plate (18), and then the glass grooves (19) are filled with glass (12). Then, a plurality of track grooves (20) are formed in the non-magnetic plate (18) in parallel with the glass grooves (19). After that, as shown in FIG. 3 (a), a plurality of winding window grooves (21) are formed in the non-magnetic plate (18) in a direction orthogonal to the track grooves (20) and the windings are wound on the opposite side. A plurality of winding grooves (not shown) are formed in parallel with the wire window groove (21). Next, FIG. 3B
As shown in (1), a nonmagnetic plate (18) is alternately coated with a metal magnetic material having a high saturation magnetic flux density such as sendust and an insulating material such as SiO ₂ or Al ₂ O ₃ by sputtering to form a track groove ( 20) and the winding window groove (21) are formed with a laminate layer (3) in which the metal magnetic film (1) and the insulating thin film (2) are alternately laminated. Although not shown, by interposing a Cr film between the metal magnetic film (1) and the insulating thin film (2), the adhesion between the films is improved. And FIG.
As shown in (a) of FIG. 4, the track groove (20) and the winding window groove (21) having the laminate layer (3) are filled with glass (6) and (28) by glass molding, and further, as shown in FIG. b)
The glass (28) filled in the winding window groove (21) is lapped as shown in FIG. Then, as shown by the chain line in the figure, the non-magnetic plate (18) is connected to the winding window groove (2
The C core block (22), which is a base material of the C core (8), is obtained by cutting in a direction parallel to 1) with a predetermined dimension.

On the other hand, the I core (26) is almost the same as the C core (8), and a glass groove (24) is formed in the non-magnetic plate (23) as shown in FIG. 5 (a). Then, the glass groove (24) is filled with the glass (13), and then the track groove (25) is formed in parallel with the glass groove (24). Then, as shown in FIG. 5B, a laminated layer (3) is formed by laminating the metal magnetic film (1) and the insulating thin film (2) on the track groove (25), and the track groove (25) is made of glass. Fill (7). Then, as shown by a chain line in the drawing, the non-magnetic plate (23) is cut in a direction perpendicular to the track groove (25) with a predetermined dimension to form an I core block (26) which is a base material of the I core (9). To get

A nonmagnetic thin film of SiO ₂ or the like (not shown) serving as a gap spacer is formed on the joint surface of either the C core block (22) or the I core block (26) obtained as described above. After depositing and forming, C core block (2
The joint surface of 2) and the I core block (26) are abutted against each other, and they are joined and integrated by welding with glass (6), (7), (12) and (13). At this time, the C core block (22) and the I core block (26) are joined and integrated by welding of the glass (28) which is filled in the winding window groove (21) and remains by cutting. After that, the C core block (22) and the I core block (26) that have been joined and integrated are sliced into a predetermined size to obtain a core chip (14) shown in FIGS.

In the first embodiment described above, the I core (9) is the same as the conventional one, but the present invention is not limited to this, and as shown in FIGS. 6 (a) and 6 (b). Alternatively, the laminate layer (3) may be formed on the portion of the I core (9) corresponding to the winding window (16). That is, in the second embodiment shown in the figure, as in the case of the C core (8), I
A laminated layer (3) composed of a metal magnetic film (1) and an insulating thin film (2) is formed on the inner end surface (29) of the core (9) corresponding to the winding window (16), and a glass (30) is further formed. Adhering and forming. As a result, the medium sliding contact surface (15) of the core chip (14)
A magnetic path is formed by the laminate layer (3) exposed to the above, the laminate layer (3) of the winding window (16) of the C core (8), and the laminate layer (3) of the I core (9). The length of the magnetic path can be made shorter than that of the embodiment, and the impedance can be reduced. Further, the angle formed by the inner end surface (29) adjacent to the joint surface (11) of the I core (9) with the C core (8) and the joint surface (11) is δ in the C core (8) [Fig. (See (a)]), the angle may be 30 to 45 °.

The manufacture of the I core (9) in the second embodiment is similar to that of the C core (8) in the first embodiment,
After processing the track groove, a winding window groove may be formed in a direction orthogonal to the track groove, and then a laminate layer including a metal magnetic film and an insulating thin film may be formed, and a detailed description thereof is omitted. To do.

[0026]

According to the present invention, after a track groove and a winding window groove are formed on a non-magnetic material plate, a metal magnetic film and an insulating thin film are alternately laminated to form a laminate layer. Therefore, the laminate layer is formed on the inner end surface of the winding window of the C core, and the magnetic path is formed with the laminate layer of the I core. As a result, the magnetic path formed by the laminate layer is not blocked by the winding window of the C core, and the inclination angle with respect to the magnetic gap of the laminate layer can be maintained at a predetermined value, and the magnetic path can be lengthened. Absent. Therefore, it is possible to prevent the cost of the product from increasing and it is easy to realize a low impedance, and it is possible to provide a high-quality magnetic head having desired output characteristics.

[Brief description of drawings]

1A is a front view showing a first embodiment of a magnetic head according to the present invention, and FIG. 1B is a plan view of the magnetic head.

2A and 2B are perspective views showing a non-magnetic material plate, and FIG. 2B is a perspective view showing a non-magnetic material plate having track grooves, for explaining a method of manufacturing the C core of the magnetic head of FIG. Figure

3A and 3B are perspective views showing a non-magnetic material plate having grooves for winding windows, and FIG. 3B is a laminate layer for explaining a method of manufacturing the C core of the magnetic head of FIG. Perspective view showing a non-magnetic plate

4A and 4B are perspective views showing a glass-molded non-magnetic material plate, and FIG. 4B is a non-magnetic material plate lapped after glass-molding, for explaining a method of manufacturing the C core of the magnetic head of FIG. Perspective view showing

5 (a) and 5 (b) are perspective views showing a non-magnetic plate having track grooves formed therein, and FIG. 5 (b) is a glass plate having a laminated layer formed thereon in order to explain the method of manufacturing the I core of the magnetic head shown in FIG. Perspective view showing a non-magnetic plate that has been wrapped after molding

FIG. 6A is a front view showing a magnetic head of a second embodiment of the present invention, and FIG. 6B is a plan view of the magnetic head.

FIG. 7A is a front view showing a conventional magnetic head;
(B) is a plan view of the magnetic head

8A and 8B are perspective views showing a non-magnetic material plate, and FIG. 8B is a perspective view showing a non-magnetic material plate having track grooves, for explaining a method of manufacturing the C core of the magnetic head of FIG. Figure

9 (a) and 9 (b) are perspective views showing a non-magnetic plate formed by forming a laminate layer and lapping after glass molding, and FIG. 9 (b) is a winding diagram for explaining the method for manufacturing the C core of the magnetic head of FIG. Perspective view showing a non-magnetic plate having a groove for a wire window

10A and 10B are perspective views showing a non-magnetic material plate having track grooves formed therein, and FIG. 10B is a glass plate having a laminated layer formed thereon in order to explain a method of manufacturing the I core of the magnetic head shown in FIG. Perspective view showing a non-magnetic plate that has been wrapped after molding

[Explanation of symbols]

 1 Metal Magnetic Film 2 Insulating Thin Film 3 Laminate Layer 4 Non-Magnetic Material Plate 5 Non-Magnetic Material Plate 8 C-Shaped Core 9 I-Shaped Core 10 Joining Surface 16 Winding Window 27 Inner End Surface

Claims (3)

[Claims] 1. A C-shaped core and an I-shaped core in which a laminate layer in which a metal magnetic film having a high saturation magnetic flux density and an insulating thin film are alternately laminated is sandwiched from both sides by a non-magnetic material plate is integrally bonded. When manufacturing the C-shaped core of the magnetic head, a track groove having an inclined surface having a predetermined angle is engraved on the non-magnetic plate, and the non-magnetic plate is formed in a direction orthogonal to the direction in which the track groove extends. A method of manufacturing a magnetic head, wherein a metal magnetic film and an insulating thin film are alternately laminated to form a laminate layer after engraving a winding window groove. 2. A C-shaped core and an I-shaped core in which a laminated layer in which a metal magnetic film having a high saturation magnetic flux density and an insulating thin film are alternately laminated are sandwiched from both sides by a non-magnetic material plate are joined and integrated. In the magnetic head, a laminate layer in which the metal magnetic film and the insulating thin film are alternately laminated is formed on the inner end surface of the winding window formed on the joint surface of the C-shaped core and the I-shaped core. And a magnetic head. 3. The winding window of the C-shaped core has a trapezoidal shape, and in the winding window, an angle formed by an inner end surface adjacent to a joint surface of the C-shaped core with the I-shaped core with respect to the joint surface is defined. The magnetic head according to claim 2, wherein the magnetic head has an angle of 30 to 45 °.