JPH0546918A - Magnetic head and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the generation of an adjacent crosstalk by arranging a metal magnetic film exposed to a medium sliding surface that a nearby part extending from a magnetic gap is made parallel along the direction of the medium at the same angle as an azimuth. CONSTITUTION:A pair of cores 21 comprising a non-magnetic body is joined integral through a metal magnetic film 24 with high saturation flux density between joint surfaces thereof and a magnetic gap (g) with a specified azimuth is formed on a medium sliding surface of a core chip 22. The metal magnetic film 24 exposed to the medium sliding surface 23 is so arranged that a nearby part (m) extending from a magnetic gap (g) is made parallel along the direction in which the medium runs at the same angle as the azimuth. As a result, when information with the magnetic gap is read out, the metal magnetic film 24 will not be positioned with a recording track adjacent to a recording track from which a reading is performed into the medium. This eliminates the generation of an adjacent crosstalk, which otherwise will cause a reading of information from the adjacent recording track and thus, there is no generation of undesired noise in the reproduction.

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 for manufacturing the same, and more particularly to a magnetic head for high density recording used in a VTR device for S-VHS and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for high density recording used in an S-VHS VTR device or the like, for example, there is an MIG head shown in FIGS.

In this head, as shown in FIGS. 7 and 8, a core (1) made of a non-magnetic material such as ceramic is joined and integrated, and a magnetic gap g is formed on the medium sliding contact surface (3) of the core chip (2). Is formed. The magnetic gap g is formed by interposing a non-magnetic thin film (not shown) such as SiO _{2 serving as a} gap spacer between the joint surfaces of the core (1). On the medium sliding contact surface (3), a metal magnetic film (4) of sendust or the like having a high saturation magnetic flux density is formed on both sides of the magnetic gap g in the medium running direction, and the metal magnetic film (4) is the magnetic gap. It is arranged so as to extend in an oblique direction from g at an angle inclined with respect to the medium traveling direction. The magnetic gap g has a predetermined track width when the metal magnetic film (4) has a predetermined thickness, and has a predetermined width in a direction orthogonal to the running direction of the magnetic tape that is a magnetic recording medium that slides on the medium sliding contact surface (3). It has an azimuth angle θ. In the figure, (5) is glass that protects the magnetic gap g.
A coil is formed on the core chip (2) by winding a wire rod using the winding groove (6) and the winding window (7).

Next, a method of manufacturing the MIG head will be described below.

First, as shown in FIGS. 9 (a) and 9 (b), a pair of long core blocks (11) made of a non-magnetic material such as ceramic is prepared, and the joint surfaces of both core blocks (11) are prepared. A plurality of V-shaped track grooves (12) are engraved at a constant pitch. Then, on one side surface of the core block (11), the groove (6) and the concave groove (13) (1) which becomes the winding window (7) are formed.
After forming 4), a metal magnetic film such as sendust having a high saturation magnetic flux density is formed in the track groove (12) on the joint surface of the core block (11) as shown in FIGS. 15)
Are deposited by sputtering or the like. At this time, the film thickness of the metal magnetic film (15) becomes a predetermined track width in the magnetic gap g. Next, as shown in FIGS. 11 (a) and 11 (b), a track groove (12) having a metal magnetic film (15) deposited thereon is formed.
Then, the low melting point glass (16) is filled with a mold or the like. Then, as shown in FIGS. 12 (a) and 12 (b), the joint surface of the core block (11) is mirror-polished, and the pair of core blocks (11) is made into a SiO ₂ gap spacer between the joint surfaces. These are abutted and heated through a non-magnetic thin film (not shown) such as the above to be joined and integrated. After that, the core block (11) joined and integrated as shown by the chain line in FIG.
Is sliced at a constant pitch along the lateral direction with a predetermined azimuth angle θ in the magnetic gap g to obtain the core chip (2) shown in FIGS. 7 and 8. still,
The shaded portion in the figure is the portion removed by slicing.

[0006]

By the way, in the above-mentioned conventional MIG head, when the information is read by the magnetic gap g, the information on the recording track adjacent to the recording track to be read on the magnetic tape is erroneously read. The magnetic gap g is provided with a predetermined azimuth angle θ so that there is no such thing as [adjacent crosstalk].

However, on the medium sliding contact surface (3) of the MIG head, the metal magnetic film (4) is arranged in the vicinity of the magnetic gap g so as to extend obliquely from the magnetic gap g along the medium running direction. The magnetic gap g
When the information is read by the magnetic tape, since the recording track adjacent to the recording track to be read on the magnetic tape is on the metal magnetic film (4) in the vicinity of the magnetic gap g, the magnetic gap g has an azimuth angle θ. However, there is a possibility that adjacent crosstalk may occur in which information on the adjacent recording track is read.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to provide a magnetic head and a manufacturing method thereof capable of reducing the possibility of occurrence of adjacent crosstalk as much as possible. To provide.

[0009]

As a technical means for achieving the above-mentioned object, a magnetic head according to the present invention comprises a pair of cores made of a non-magnetic material and a metal magnetic film having a high saturation magnetic flux density between the joint surfaces thereof. In a magnetic head in which the magnetic gap having a predetermined azimuth angle is formed on the medium sliding contact surface of the core chip, the metal magnetic film exposed on the medium sliding contact surface has a portion near the magnetic gap. The azimuth angle is the same as the azimuth angle, and the azimuth angle is parallel to the medium running direction.

Further, in the method of manufacturing a magnetic head according to the present invention, the joint surface of the pair of core blocks made of a non-magnetic material has a portion inclined by the same angle as the azimuth angle with respect to the perpendicular direction at the joint surface. A step of engraving a plurality of track grooves having groove surfaces along the longitudinal direction of the core block, and a metal magnetic film having a high saturation magnetic flux density on the track grooves of the joint surface of the core block with a predetermined track width. The step of depositing, the step of filling the track groove, to which the metal magnetic film of the core block is adhered, with glass, and then mirror-polishing the joint surface of the core block, and the gap between the joint surfaces of the core block. The step of butt-joining through a non-magnetic thin film that serves as a spacer and joining together, and the joining-integrated core block at the same angle as the azimuth angle along the lateral direction. Characterized by comprising the slice to process.

[0011]

In the present invention, since the vicinity portion extending from the magnetic gap of the metal magnetic film is arranged in parallel along the medium traveling direction at the same angle as the azimuth angle, it is possible to read the medium when reading information by the magnetic gap. Since the metal magnetic film is not located on the recording track adjacent to the recording track, the adjacent crosstalk of reading the information on the adjacent recording track is completely eliminated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head and a method of manufacturing the same according to the present invention will be described with reference to FIGS.

In the magnetic head of the present invention shown in FIGS. 1 and 2, a core (21) made of a non-magnetic material such as ceramic is joined and integrated, and a magnetic gap is formed on the medium sliding contact surface (23) of the core chip (22). g is formed. The magnetic gap g is formed by interposing a non-magnetic thin film (not shown) such as SiO _{2 serving as a} gap spacer between the joint surfaces of the core (21). On the medium sliding contact surface (23), metal magnetic films (24) such as sendust having a high saturation magnetic flux density are formed on both sides of the magnetic gap g in the medium running direction. The magnetic gap g has a predetermined track width when the film thickness of the metal magnetic film (24) is set, and is predetermined in the direction orthogonal to the running direction of the magnetic tape that is the magnetic recording medium that slides on the medium sliding contact surface (23). It has an azimuth angle θ.

The feature of the present invention resides in the metal magnetic film (24). That is, the metal magnetic film (2) exposed on the medium sliding contact surface (23)
In 4), the vicinity portion (m) extending from the magnetic gap g is arranged in parallel along the medium traveling direction at the same angle as the azimuth angle θ of the magnetic gap g. Further, the portion (m) of the metal magnetic film (24) in the vicinity of the magnetic gap g is arranged so as to extend obliquely at an angle inclined with respect to the medium running direction. In the figure, (25) is glass that protects the magnetic gap g. A coil is formed on the core chip (22) by winding a wire rod using the winding groove (26) and the winding window (27).

In the MIG head having the above structure, the information on the recording track of the magnetic tape is read by the magnetic gap g having the azimuth angle θ by running the magnetic tape on the medium sliding contact surface (23). Since the vicinity portion (m) extending from the gap g is arranged in parallel along the medium traveling direction at the same angle as the azimuth angle θ of the magnetic gap g, it is attempted to read out the magnetic tape in the vicinity of the magnetic gap g. Since the metal magnetic film (24) does not exist on the recording track adjacent to the adjacent recording track, the adjacent crosstalk, which is a mistaken reading of the adjacent recording track, does not occur.
Incidentally, the portion of the metal magnetic film (24) in the vicinity of the magnetic gap g (m) and beyond is arranged in an oblique direction at an angle inclined with respect to the medium traveling direction, and adjacent recording tracks have the metal magnetic film ( 24) As mentioned above, since this portion is located away from the magnetic gap g, it does not affect the reading of information by the magnetic gap g and adjacent crosstalk does not occur.

Next, a method of manufacturing the MIG head will be described below.

First, as shown in FIGS. 3 (a) and 3 (b), a pair of long core blocks (31) made of a non-magnetic material such as ceramic is prepared, and the joint surfaces of both core blocks (31) are prepared. A plurality of track grooves (32) are engraved at a constant pitch. The feature of the method of the present invention lies in the formation of the track groove (32). That is, a track groove (32) having a groove surface having a portion (n) inclined by the same angle as the azimuth angle θ with respect to the perpendicular direction (s) at the joint surface of the core block (31) is formed in the core block (31). Carved along the longitudinal direction of. Then, after forming the winding grooves (26) and the concave grooves (33) (34) to be the winding windows (27) on the side surface of the one core block (31), (a) and (b) of FIG. As shown in, a metal magnetic film (35) of sendust or the like having a high saturation magnetic flux density is formed on the track groove (32) on the joint surface of the core block (31) by sputtering or the like. At this time, the film thickness of the metal magnetic film (35) becomes a predetermined track width in the magnetic gap g. Here, the metal magnetic film (35) deposited on the portion (n) inclined by the same angle as the azimuth angle θ on the groove surface of the track groove (32) has the medium sliding contact surface (23) in the aforementioned MIG head. ) Corresponds to a portion (m) near the magnetic gap g. Next, as shown in FIGS. 5A and 5B, the track groove (32) on which the metal magnetic film (35) is formed is filled with the low melting point glass (36) by a mold or the like. Then, after mirror-polishing the joint surface of the core block (31),
A pair of core blocks (31) as shown in (a) and (b) of FIG.
Are abutted against each other through a non-magnetic thin film (not shown) such as SiO ₂ which serves as a gap spacer between them to heat and integrate them. After that, the core block (31) joined and integrated as shown by the chain line in FIG. 6 (b) is provided with a predetermined azimuth angle θ in the magnetic gap g along its lateral direction.
The core chip (22) shown in FIGS. 1 and 2 is obtained by slicing at a constant pitch. The shaded portion in the figure is the portion removed by slicing.

[0018]

According to the present invention, since the vicinity portion extending from the magnetic gap of the metal magnetic film is arranged in parallel along the medium traveling direction at the same angle as the azimuth angle, the medium is read at the time of reading information by the magnetic gap. Since the metal magnetic film is not positioned with respect to the recording track adjacent to the recording track to be read, there is no possibility that adjacent crosstalk of reading the information of the adjacent recording track occurs. Therefore, undesired noise does not occur during reproduction on the VTR device, and a high-quality VTR device can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head according to the present invention.

FIG. 2 is a plan view of the magnetic head of FIG.

3A is a perspective view showing a state where track grooves are formed in a core block in the method of the present invention, and FIG. 3B is a view showing FIG.
Partial enlarged plan view showing the core block

FIG. 4A is a perspective view showing a state in which a metal magnetic film is deposited on the track groove of the core block in the method of the present invention, and FIG. 4B is a partially enlarged plan view showing the core block of FIG. 4A.

FIG. 5 (a) is a perspective view showing a state where glass is filled in the track groove of the core block in the method of the present invention, (b).
Is a partially enlarged plan view showing the core block of FIG.

FIG. 6A is a perspective view showing a state where core blocks are butted and joined together in the method of the present invention, and FIG. 6B is a partially enlarged plan view showing the core block of FIG. 6A.

FIG. 7 is a perspective view showing a conventional example of a magnetic head.

FIG. 8 is a plan view of the magnetic head of FIG.

9A is a perspective view showing a state where track grooves are formed in a core block by a conventional method, and FIG. 9B is a partially enlarged plan view showing the core block of FIG. 9A.

FIG. 10 (a) is a perspective view showing a state in which a metal magnetic film is deposited on a track groove of a core block by a conventional method,
(B) is a partially enlarged plan view showing the core block of (a).

11A is a perspective view showing a state where the track groove of the core block is filled with glass in the conventional method, and FIG. 11B is a partially enlarged plan view showing the core block of FIG. 11A.

12A is a perspective view showing a state where core blocks are butted and joined together in a conventional method, and FIG. 12B is a partially enlarged plan view showing the core block of FIG. 12A.

[Explanation of symbols]

 21 core 22 core chip 23 medium sliding surface 24 metal magnetic film m vicinity part θ azimuth angle 31 core block 32 track groove 35 metal magnetic film 36 glass n inclined part s perpendicular direction

Claims (2)

[Claims] 1. A pair of cores made of a non-magnetic material are joined and integrated with each other through a metal magnetic film having a high saturation magnetic flux density between their joint surfaces, and a magnetic substance having a predetermined azimuth angle is formed on a medium sliding contact surface of the core chip. In a magnetic head having a gap, the magnetic metal film exposed on the medium sliding contact surface is characterized in that a portion extending from the magnetic gap is parallel to the medium running direction at the same angle as the azimuth angle. head. 2. A core having a plurality of track grooves each having a groove surface having a portion inclined by the same angle as an azimuth angle with respect to a perpendicular direction of the pair of core blocks made of a non-magnetic material. A step of engraving along the longitudinal direction of the block, a step of depositing and forming a metal magnetic film having a high saturation magnetic flux density in the track groove of the joint surface of the core block with a thickness to a predetermined track width, After filling the track groove with the metallic magnetic film with glass and then mirror-polishing the joint surface of the core block, the core block is butted with a non-magnetic thin film that serves as a gap spacer between the joint surfaces. And the process of slicing the bonded and integrated core block along the widthwise direction at the same angle as the azimuth angle. A method of manufacturing a magnetic head that.