JPH0636227A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To perform the relative alignment of one pair of magnetic gaps with good accuracy and easily and to easily perform the manufacturing work of a slider arranged between one pair of core chips. CONSTITUTION:A first core ship 11 wherein one pair of ferrite cores are bonded and integrated and a first magnetic gap g1 has been formed and a second core chip 12 wherein one pair of ferrite cores are bonded and integrated and a second magnetic gap g2 having a prescribed azimuth angle theta has been formed are bonded and integrated in a state that ceramic sliders 13 to 15 have been arranged. At this time, the core chips are aligned by bringing a guide jig 22 into contact with an edge on their leading side or their trailing side. The guide 22 is provided with a recessed part 24, having a size A by which the second core chip 12 protrudes from the edge on the leading side or the trailing side, in an abutment face 23 with the edge on the leading side or the trailing side, and the core chips are aligned by making a protrusion part 21 on the second core chip 12 abut upon the inner face of the recessed part 24.

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 to a magnetic head for an FDD device having a magnetic gap for read / write and servo tracking integrally and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, with the increase in recording density, magnetic heads used in FDD devices are used for read / write for writing and reading information by narrowing tracks in magnetic recording media such as floppy disks. The magnetic gap must be accurately positioned with respect to the recording track of the magnetic recording medium. Since the read / write magnetic gap is aligned with the recording track by using the servo mechanism built in the FDD device, servo tracking is performed for the purpose of detecting the current position of the magnetic gap.

A conventional example of a magnetic head having the read / write magnetic gap and the servo tracking magnetic gap as a unit and a conventional method of manufacturing the same will be described below with reference to FIGS.

In this magnetic head, as shown in FIGS. 6 and 7, a pair of cores made of a ferromagnetic material such as ferrite are joined and integrated, and a magnetic gap for read / write g ₁ [hereinafter referred to as the first The core chip for read / write (1) [hereinafter referred to as the first core chip] having a magnetic gap formed therein and a pair of cores made of a ferromagnetic material such as ferrite are joined and integrated, and a predetermined amount is provided on the top end face thereof. Servo tracking core chip (2) [hereinafter referred to as a second core chip] having a servo tracking magnetic gap g ₂ [hereinafter referred to as a second magnetic gap] having an azimuth angle θ of It has a structure in which sliders (3) to (5) made of a non-magnetic material such as ceramic are placed between 1) and (2) and outside each core chip (1) and (2) and integrated by an adhesive material. It

An air bleeding groove (not shown) is provided on the medium sliding contact surface (6) of the magnetic head, particularly on the top end surface of the slider (3) to improve the sliding contact condition with the magnetic recording medium. Are formed along the traveling direction of the medium.

[0006] In this magnetic head, the second magnetic gap
g₂By providing a predetermined azimuth angle θ to
Magnetic gap g₁And the non-parallel state with the second
Magnetic gap g₂Read the data signal by mistake
On the contrary, the first magnetic gap g₁Incorrect servo signal with
I try not to read it.

Also, the first and second core chips (1) (2)
The slider (3) sandwiched between the shield plates (7) made of a ferromagnetic material such as ferrite, and two slider members (8) made of a non-magnetic material such as ceramic from both sides thereof.
It has a structure in which it is sandwiched by (9) and joined and integrated with an adhesive. By arranging this slider (3) between the first and second core chips (1) and (2), mutual interference between the first and second magnetic gaps g ₁ and g ₂ can be prevented. So I try to prevent it.

[0008] The relative positions of both magnetic gap g _1, g _2, aligning the two magnetic gap g _1, g ₂ a mutual distance Dgg along the medium conveying direction 0, and perpendicular to the medium conveying direction It is necessary to set the mutual distance Lgg in the moving direction to a predetermined size to separate the two magnetic gaps g ₁ and g ₂ .
Of the relative alignment of both magnetic gaps g ₁ and g ₂ ,
The mutual distance Lgg is regulated by the total thickness of the slider (3) located between the first and second core chips (1) and (2), while the mutual distance Dgg is
Second core chips (1) (2) and sliders (3) to (5)
The position will be adjusted when joining and integrating.

That is, in the manufacture of the magnetic head,
Second core chips (1) (2) and sliders (3) to (5)
When joining and integrating the two, the first and second core chips (1) are fixed by a special jig (not shown) as shown in FIG.
With (2) and sliders (3) to (5) assembled,
Either one of the first and second core chips [for example, the second core chip (2) in the figure] is fixedly arranged by the fixing jig (10), while the other core chip [the first core chip in the figure
Core chip (1)] is arranged so as to be movable in the medium traveling direction. In this state, the movable first core chips (1) (1) (1) (2) and the sliders (3) to (5) are observed by magnifying the medium sliding contact surface (6). ) Is moved along the medium running direction so that the mutual distance Dgg between the first magnetic gap g ₁ and the second magnetic gap g ₂ is zero.

[0010]

By the way, in the above-described conventional magnetic head, it was very difficult to align the first and second magnetic gaps g ₁ and g ₂ relative to each other in terms of manufacturing.

That is, regarding the mutual distance Dgg between the first and second magnetic gaps g ₁ and g ₂ along the medium traveling direction, the first core chip (1 ) Must be aligned while moving, the position adjustment work takes time and the alignment accuracy becomes low, and a process for aligning the mutual distance Dgg is required during the manufacturing process.

The mutual distance Lgg between the first and second magnetic gaps g ₁ and g _{2 in} the direction orthogonal to the medium running direction is arranged between the first and second core chips (1) and (2). The slider (3) has a shield plate (7) and two slider members (8).
Since it has a structure in which it is sandwiched between (9) and bonded and integrated with an adhesive, it takes a lot of time to bond the shield plate (7) and the slider members (8) and (9) with the adhesive, and the bonding accuracy is improved. Low, and in order to manufacture the slider (3), the shield plate (7) and slider members (8) (9)
Was required as a separate process.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to accurately and easily perform relative alignment between the first and second magnetic gaps.
An object of the present invention is to provide a magnetic head and a method of manufacturing the magnetic head, which can easily manufacture the slider arranged between the first and second core chips.

[0014]

As a technical means for achieving the above-mentioned object, the method of the present invention is a method in which a pair of cores made of a ferromagnetic material are joined and integrated, and a first magnetic gap is formed on the medium sliding contact surface. And a second core chip in which a pair of cores made of a ferromagnetic material are joined and integrated to form a second magnetic gap having a predetermined azimuth angle on the medium sliding contact surface. When joining and integrating the sliders made of a non-magnetic material between the core chips and outside each core chip, by bringing a guide jig into contact with the leading side or trailing side end surface of both core chips and sliders, In the method of aligning the slider, the guide jig has a contact surface with both core chips and a leading side or trailing side end surface of the slider. 2 core chips to form a recess sized to protrude from the end face of the first core chip and the slider,
It is characterized in that the protrusion of the second core chip is brought into contact with the inner surface of the recess for alignment.

Further, in the method of the present invention, a pair of cores made of a ferromagnetic material are joined and integrated to form a first magnetic gap on the medium sliding contact surface, and a pair of a ferromagnetic material. A second magnetic gap having a predetermined azimuth angle formed on the medium sliding contact surface by integrally joining the cores
When the core chip and the non-magnetic slider having a shield plate between the core chips and the non-magnetic slider on the outside of each core chip are jointly integrated with each other, a predetermined gap is provided between the first and second core chips. After forming a groove in a slider having a thickness corresponding to the distance, a shield plate is fitted in the groove and arranged between both core chips.

In the magnetic head according to the present invention, the slider arranged between the core chips is shaped like a gate, a groove is formed at the upper side of the slider, and a T-shaped shield plate is fitted into the groove. It is characterized by having done.

The magnetic head of the present invention is composed of a ferromagnetic material and a first core chip in which a pair of cores made of a ferromagnetic material are joined and integrated to form a first magnetic gap on the medium sliding contact surface. A second core chip in which a pair of cores are joined and integrated to form a second magnetic gap having a predetermined azimuth angle on the medium sliding contact surface, and a slider made of a non-magnetic material is provided between both core chips and outside each core chip. In the integrated and joined state in the arranged state, the leading side and trailing side ends of both core chips are formed of a non-magnetic material.

[0018]

According to the present invention, when the first and second core chips and the slider are integrally joined and aligned with each other, the leading side or trailing side end faces of the first core chip and the slider are pressed against the contact face of the guide jig. Abutting the leading side or trailing side end face of the second core chip,
This is performed by pressing against the inner surface of the recess formed on the contact surface of the guide jig. As a result, the first and second core chips and the slider are integrally joined together, and the first magnetic gap and the second magnetic chip are joined together.
It is possible to accurately and easily set the mutual distance along the medium traveling direction with respect to the magnetic gap.

Further, since the slider disposed between the first and second core chips is formed in a gate shape and the groove is formed and the shield plate is fitted in the groove, the slider can be easily manufactured. The mutual distance between the first magnetic gap and the second magnetic gap in the direction orthogonal to the medium traveling direction can be set easily with high accuracy.

Further, the magnetic head of the present invention has the first and second magnetic heads.
Since the leading side and trailing side ends of the core chip are formed of a non-magnetic material, the head inductance of both core chips can be reduced and magnetic mutual interference can be suppressed.

[0021]

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 magnetic head according to the present invention is shown in FIGS.
As shown in FIG. 2, a pair of cores made of a ferromagnetic material such as ferrite are joined and integrated, and the first magnetic gap g
The first core chip (11) forming ₁ and a pair of cores made of a ferromagnetic material such as ferrite are joined and integrated to form a second magnetic gap g having a predetermined azimuth angle θ on the top end face thereof.
_{A second} core chip (12) on which the _two are formed, and a slider (13) made of a non-magnetic material such as ceramic between the core chips (11) and (12) and outside each core chip (11) (12).
It has a structure in which (15) is joined and integrated with an adhesive in a state of being arranged. In addition, an air bleed groove (17) for improving the sliding contact state with the magnetic recording medium running on the medium sliding contact surface (16) is provided on the top end surface of the slider (13) along the medium running direction. Has been formed.

The first and second core chips (11) (1)
2) is for read / write and servo tracking as described above, and the leading side and trailing side ends, which are π-shaped lateral overhangs, are formed of a non-magnetic material (m) such as ceramics. As a result, in the respective core chips (11) and (12), the first and second magnetic gaps g ₁ ,
The ferromagnetic material exists only in the vicinity including g ₂ , and the ferromagnetic material does not exist in the areas separated from the magnetic gaps g ₁ and g ₂ , that is, the leading end and the trailing end, and the non-magnetic material ( m), so both core chips (11) (1
2) Mutual interference between them can be suppressed as much as possible.

Further, the first and second core chips (11)
A slider (13) sandwiched between (12) has a gate shape, and an upper side (13a) thereof has a groove (18) vertically penetrating along the medium running direction. On the other hand, a T-shaped shield plate (19) made of a ferromagnetic material such as ferrite is fitted into the groove (18) of the slider (13) and fixed with an adhesive. As a result, the central portion of the shield plate (19) is
Since it is inserted and arranged between both side portions (13b) of 3), and is arranged between the first and second core chips (11) and (12) over a wider range than the conventional one, Mutual interference between the _first and second magnetic gaps g ₁ and g ₂ can be prevented more efficiently than before. The slider (13)
Is processed into a gate shape, so that a space for winding the coil around the first and second core chips (11, 12) is secured.

Here, the first and second magnetic gaps g ₁ and g ₂ are arranged at positions separated from the leading side or trailing side end face [leading side end face in the figure] by a predetermined dimension S, and And the second magnetic gap g ₁ and g ₂
The mutual distance Dgg along the medium traveling direction with and must be aligned so as to be zero. Further, it is necessary to set the mutual distance Lgg in the direction orthogonal to the medium traveling direction to a predetermined dimension so that the magnetic gaps g ₁ and g ₂ are separated from each other. In the relative alignment of the two magnetic gaps g ₁ and g ₂ , the mutual distance Lgg is regulated by the thickness of the slider (13) located between the first and second core chips (11) and (12), and the other. The mutual distance Dgg is adjusted when the first and second core chips (11) and (12) and the sliders (13) to (15) are joined and integrated. This is performed by collectively abutting and integrally joining a guide jig having a recess having a size corresponding to the oblique end surface protrusion (21) of the second core chip (servo core chip) generated in the manufacturing process. .

The protrusion (21) is generated in the second core chip (12) by a predetermined amount in the second magnetic gap g ₂ in order to prevent mutual interference with the first core chip (11). Azimuth angle θ is set, and as a result, when attempting to regulate the position of the second magnetic gap g ₂ described above,
This is because it is necessary to preliminarily carry out predetermined size regulation in manufacturing the second core chip (12). That is, FIG. 4 shows the upper surface of the core block (20) used in manufacturing the second core chip (12), and the second core chip (12) is cut out from the core block (20) as shown in FIG. At that time, the second core chip (12) is sliced in an oblique direction based on the azimuth angle θ of the _second magnetic gap g ₂ [in the figure, for example, the azimuth angle θ is 45 °, The direction is 45 °]. At this time, the dimension from the magnetic gap g ₂ to the leading side or the trailing side (leading side in the figure) end surface is set to be the above-mentioned predetermined dimension S, and a planar triangular shape is formed from the leading side and the trailing side. It is found that the dimension A of the protrusion (21) has a predetermined value. As will be described later, the second core chip (12) is aligned to set the mutual distance Dgg between the first and second magnetic gaps g ₁ and g ₂ based on the predetermined dimension A of the protrusion (21). become.

In the present invention, in the manufacture of the magnetic head,
First and second core chips (11) (12) and slider (1
3) to (15) are joined and integrated as shown in FIGS.
Use the guide jig (22) as shown in. This guide jig (22) is provided with a second core chip (12) on the contact surface (23) with the leading side or trailing side end surface of both core chips (11) (12) and sliders (13) to (15). ) Is the first
The core chip (11) and the sliders (13) to (15) are formed with the recesses (24) of a predetermined dimension A of the protrusions (21) protruding from the end faces.

When aligning the first and second core chips (11) and (12) and the sliders (13) to (15),
First, as shown in FIGS. 1 and 2, both core chips (11)
The guide jig (22) is arranged on either the leading side or the trailing side (for example, the leading side in the figure) of the assembled state of (12) and the sliders (13) to (15). Then, as shown in FIG. 5, the leading side or trailing side end surfaces of the first core chip (11) and the sliders (13) to (15) are brought into contact with the contact surface (23) of the guide jig (22). With the second core chip (12)
The protrusion (21) of the above is brought into contact with the inner surface of the recess (24) of the guide jig (22).

As a result, as described above, in the recess (24) of the guide jig (22), the second core chip (12) is the first.
Since the core chip (11) and the protruding portion (21) protruding from the end surfaces of the sliders (13) to (15) have a predetermined dimension A, the first magnetic gap g ₁ and the second magnetic gap g ₂ are It becomes easy and reliable to set the mutual distance Dgg along the medium sliding contact direction to 0.

The mutual distance Lgg in the direction orthogonal to the medium running direction is regulated by the total thickness of the slider (13) located between the first and second core chips (11, 12) as described above. However, in the case of the present invention, the slider (1
Since 3) is a single block-shaped member, the overall thickness can be accurately controlled, the mutual distance Lgg can be improved, and the T-shaped shield plate (19) can be attached to the slider ( Since it has a structure to fit in the groove (18) of 13),
Easy to assemble. Since the shield plate (19) is fitted in the groove (18) of the slider (13), its upper end is the upper end surface of the slider (13), that is, the medium sliding contact surface (16).
However, since the shield plate (19) is arranged in the air bleed groove (17) of the slider (13), the upper end of the shield plate (19) may be uneven. There is no problem because it is not exposed on the medium sliding surface (16).

[0031]

According to the present invention, for relative alignment of the first and second magnetic gaps, it is easy to set the mutual distance along the medium traveling direction and the mutual distance in the direction orthogonal to the medium traveling direction. Can be carried out easily and with high precision, and the shield plate disposed between the first and second core chips can be easily assembled, and the workability of assembling both core chips and the slider is dramatically improved. However, it is possible to reduce the cost of the product and provide a magnetic head of great practical value.

[Brief description of drawings]

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

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

FIG. 3 is a side view of the magnetic head of FIG.

FIG. 4 is a partial plan view showing a core block in manufacturing the second core chip of FIG.

FIG. 5 is a plan view for explaining the method of the present invention, showing a state in which the first and second core chips and the slider are aligned by a guide jig.

FIG. 6 is an exploded perspective view showing a conventional example of a magnetic head.

FIG. 7 is a plan view of the completed assembly of the magnetic head of FIG.

FIG. 8 is a view for explaining the relative alignment procedure of the first and second magnetic gaps according to the conventional method.
Plan view showing the core chip and slider of

[Explanation of symbols]

11 Read / write core chip [first core chip] 12 Servo tracking core chip [second core chip] 13 Slider 13a Upper side 14 Slider 15 Slider 16 Medium sliding contact surface 18 Groove 19 Shield plate 21 Projection 22 Guide jig 23 Contact surface 24 Recessed portion g ₁ Magnetic gap for read / write [first magnetic gap] g ₂ Magnetic gap for servo tracking [second magnetic gap] θ Azimuth angle

Claims (4)

[Claims] 1. A read / write core chip in which a pair of cores made of a ferromagnetic material are joined and integrated to form a read / write magnetic gap on a medium sliding contact surface, and a pair of cores made of a ferromagnetic material are joined. A servo tracking core chip, which is integrated and has a magnetic gap for servo tracking with a predetermined azimuth angle on the medium sliding contact surface, is bonded between both core chips and a slider made of a non-magnetic material is arranged outside each core chip. In the method of aligning both core chips and sliders by bringing the guide jigs into contact with the leading side or trailing side end surfaces of both core chips and sliders at the time of integration, the guide jigs are On the contact surface with the leading side or trailing side end surface, the servo tracking coil It is characterized in that a recess is formed in such a size that the chip protrudes from the end face of the read / write core chip and the slider, and the protrusion of the servo tracking core chip is brought into contact with the inner surface of the recess for alignment. Head manufacturing method. 2. A pair of cores made of a ferromagnetic material and a pair of cores made of a ferromagnetic material are joined together to form a read / write magnetic chip having a magnetic gap for a read / write formed on the medium sliding contact surface. A servo tracking core chip integrally formed with a servo tracking magnetic gap having a predetermined azimuth angle on the medium sliding contact surface, a non-magnetic slider having a shield plate between both core chips, and a non-magnetic outside of each core chip. When the sliders of the body are respectively joined and integrated together, a groove is formed in the slider arranged between both core chips, and then a shield plate is fitted into the groove. Head manufacturing method. 3. A pair of cores made of a ferromagnetic material and a pair of cores made of a ferromagnetic material are joined together to form a read / write magnetic chip having a magnetic gap for a read / write formed on the medium sliding contact surface. A servo tracking core chip integrally formed with a servo tracking magnetic gap having a predetermined azimuth angle on the medium sliding contact surface, a non-magnetic slider having a shield plate between both core chips, and a non-magnetic outside of each core chip. In the case where the body sliders are integrally joined in a state of being arranged, the slider arranged between both core chips has a gate shape, and a concave groove penetrating at the upper side thereof is formed, and a T-shaped groove is formed in the concave groove. A magnetic head having a shield plate fitted therein. 4. A read / write core chip in which a pair of cores made of a ferromagnetic material are joined and integrated to form a read / write magnetic gap on a medium sliding contact surface, and a pair of cores made of a ferromagnetic material are joined. A servo tracking core chip, which is integrated and has a magnetic gap for servo tracking with a predetermined azimuth angle on the medium sliding contact surface, is bonded between both core chips and a slider made of a non-magnetic material is arranged outside each core chip. A magnetic head in which the end portions on the leading side and the trailing side of the both core chips are formed of a non-magnetic material in the integrated one.