JPS6174122A - Manufacture of head core of magnetic head - Google Patents

Abstract

PURPOSE:To attain one bonding process and to regulate accurately the gap by forming a core composite where a center core, a side core and a spacer specifying the gap are combined at once. CONSTITUTION:A bridge 10 prescribing the gap of the side core 8 and a space 11 are formed to the center core 9. The side sore 8 is bonded to both sides of the center core 9, the spacer 12 is inserted to the center core space 11 and the three components are coupled at once to form a core composite 13. Then one face of the composite 13 is polished to form a medium press contact face to complete plural chips with prescribed fine slicing. Thus, one bonding process is enough for the manufacture so as to simplify the process. Since the change in the gap is prevented by the bridge part 10, the gap is regulated accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a head core of a magnetic head having two gaps for erasing and recording or recording and reproduction.

BACKGROUND OF THE INVENTION Conventionally, as shown in FIG. 9, magnetic bodies 2 are bonded to the inner surfaces of left and right magnetic bodies 1 with an adhesive to form a gap 3, and then a non-magnetic space 4 is bonded. There is a method for manufacturing the head core.

In addition, as a second method, as shown in FIG.
There is a way to bond like-minded people.

Furthermore, as a third method, as shown in FIG. There is a method of providing a spacer 7 made of laminated materials and adhering this spacer 7 to the inner surface of the magnetic material 2.

Problems to be Solved by the Invention However, there are variations in the thickness of the spacer 4 or 7, and furthermore, there are variations in the adhesive layer between the magnetic body 2 and the spacer 4 or 7. It is not possible to determine the spacing accurately. Furthermore, there are at least two adhesion steps: a step of adhering the magnetic material 1.2 for gap 3 management, and a step of adhering the spacer 4 or 7 between the magnetic materials 2, and the second adhesion step This method has the disadvantage that an adhesive having a melting point lower than that of the adhesive used in the process must be used.

This invention was made in view of the above points, and the distance between the two gaps can be fixed and easily determined.
Furthermore, it is an object of the present invention to provide a method for manufacturing a head core for a magnetic head that can be completed in one bonding step.

Means for Solving the Problems The present invention firstly provides two side cores 8 and a center core 9, as shown in FIGS. 1(a) to 1(f). A bridge portion IO and a space portion 11 are formed in the center core 9 to define an interval between the side cores 8. Next, the side cores 8 are bonded to both sides of the center core 9, and the spacers 12 are fixedly inserted into the space 11.
A core combination body 13 is formed by combining the center core 9 and the spacer 12, and one surface of the core combination body 13 is cut within a plane including the bridge portion 10 to form a medium contacting surface 14.

This completes the head core, but if necessary, the combined core body 13 is sliced across the gap 15 and divided into a plurality of pieces according to the track width of the medium.

Second, as shown in FIGS. 3(a) and 3(b), a spacer 24 having a magnetic plate 22 in part is used.

Thirdly, as shown in FIGS. 2(a) to (d), spacer 1
Make 2 longer.

Fourth, as shown in FIGS. 4(a) and 4(b), a plurality of spaces 11 are formed in the center core 9, and non-magnetic spacers 12 are bonded to these spaces 11 when forming the core assembly L3. do.

Fifth, as typified by FIGS. 5(a) to 5(d), the central magnetic body 25 has a plurality of bridge parts 29 and a space 30 located between these bridge parts 29. The magnetic material 28 is adhered to both sides, the spacer 31 is fixed to the space 30, and the thus formed magnetic material block 32 is cut at the bridge portion 29 to form a plurality of core combination bodies 33.
get. If necessary, the core assembly 33 is sliced and divided into a plurality of pieces so as to cross the gap 15 in accordance with the track width of the medium.

In the first method (FIG. 1), only one type of adhesive is required, and - number of bonding steps are required. Also, the two gaps 15 are closed by the bridge part 10 until the adhesive dries.
After drying, the bridge portion 10 is bent to block the side core 8 from hitting, but the hardened spacer 12 itself maintains the distance between the two gaps 15 constant.

Further, by slicing the core assembly 13 across the gap 15 as necessary, a large number of head cores can be formed at once.

In the second means (FIG. 3), the magnetic shielding effect is improved.

In the third method (FIG. 2), it is possible to provide a terminal on a part of the spacer 12.

In the fourth means (FIG. 4), when the bridge portion 10 is cut, the center core 9 itself is separated into a plurality of overlapping magnetic bodies with a non-magnetic spacer 12 in between, and one of them is A part of it will be used as a center shield member.

In the fifth means (FIG. 5), the magnetic block 32
A plurality of core combinations 33 are obtained at once by separating the cores. Further, by slicing this core assembly 33 across the gap 15 as required, a larger number of core assembly may be formed.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1(a) to 1(f). First, as shown in FIG. 1(,), there are two side cores 8 having recesses 16, a center core 9 having a bridge portion 10 formed at the bottom of a groove 11 which is a space, and a core made of a non-magnetic material. σ-sa 12 is provided. Next, as shown in FIG. 1(b), the side cores 8 and the center core 9 are bonded together using an inorganic adhesive to form a gap 15, and a spacer t2 is bonded to the groove 11. In this bonding process, by oriented the open ends of the grooves 11 upward and downward, the filling rate of the adhesive in the grooves 11 and the gaps 15 is improved, and the number of air bubbles in the adhesive is reduced.

The core assembly 13 thus formed is shown in FIG.
), the medium contacting surface 14 is formed as shown in FIG. 1 (Aug. The state shown in d) is the completed state as a rad core, but if necessary, it can be sliced perpendicular to the gap 15 to match the track width of the medium to create a thin core as shown in Fig. 1(e). Divide into combined bodies 13. Then,
A coil 17 is wound around the recessed portion of the side core 8 as shown in FIG. 1(f).

Therefore, it is possible to bond the side cores 8 and the center core 9 and to bond the spacers 12 at the same time, and only one type of adhesive is required. In addition, the inner surface of the groove 11 and the spacer 1
An adhesive layer is formed between the two and the two, but even if the amount of adhesive is less than 15, the bridge part 10 forms the gap 15 between the two.
The spacing can be determined accurately and easily. Although this bridge portion 10 cracks after the adhesive dries, the spacer 12 is also fixed at this time, so the spacing between the gears 15 does not change.

Next, a second embodiment of this invention is shown in FIGS. 2(a) to (c).
). Components that are the same as those in the embodiment described above are designated by the same reference numerals, and description thereof will be omitted (the same applies hereinafter).

In this embodiment, the length of the spacer 12 is made deeper than the depth of the groove 11. As shown in FIG. 2(b).

By increasing the width of the groove 11, the thickness of the adhesive [1B] is increased. Then, the bridge portion 10 is cut to form a medium contacting surface 14 as shown in FIG. 2(C).

In this state, the non-magnetic spacer 12 is exposed, so the terminal 19 connected to the coil wound in the recess 16
The substrate 20 on which is formed can be fixed to the spacer 12. Further, the terminal 19 can also be formed on the spacer 12 before being inserted into the groove 11 by means such as thick film printing or four pancreas formation. Alternatively, the spacer 12 protruding from the groove 11 can also be used as a mounting portion for a magnetic recording device.

Furthermore, a third embodiment of the present invention is shown in FIGS. 3(a) and (b).
Shown below. In this embodiment, when bonding the side core 8 and the center core 9, a non-magnetic plate 21, a magnetic plate 22 to be bonded to both sides of the non-magnetic plate 21, and an adhesive 23 filling the periphery of these plates are placed in the groove 11. A spacer 24 is formed of a non-magnetic plate 21, a magnetic plate 22, and a solidified adhesive 23. An adhesive 23, that is, a non-magnetic surface, is formed on both sides of this spacer 24. FIG. 3(b) shows a state in which the bridge portion 10 is cut to form a medium contacting surface 14.

Therefore, the magnetic plate 22 can effectively shield leakage magnetic flux between the left and right gaps 15. Note that the spacer may be formed by the magnetic plate 2-2 and the adhesive 23, excluding the non-magnetic plate 21.

Furthermore, a fourth embodiment of the present invention is shown in FIGS. 4(a) to (c).
). As shown in FIG. 4(a), the center core 9 is formed with a bridge portion 10 and a plurality of grooves 11 arranged along the bridge portion IO. As shown in FIG. 4(b), the side cores 8 are bonded to both sides of the center core 9, and non-magnetic spacers 12 are placed in the grooves 11.
are inserted and adhered to form the core assembly 13. Then, the bridge portion 10 is cut as shown by the dashed line to form the medium contacting surface 14 as shown in FIG. 4(c).

Therefore, when the bridge portion 10 is cut, the center core 9 is divided into a plurality of magnetic plates, which are partitioned by spacers 12 made of non-magnetic material.

Therefore, the magnetic plate between the spacers 12 can be used as a center shield plate. This embodiment is most suitable for the head core of a read-after-write magnetic head.

Furthermore, a fifth embodiment of the present invention is shown in FIGS. 5(a) to (e).
). A central magnetic body 25 consisting of two magnetic plates 26 and 27 and two magnetic bodies 28 having a plurality of recesses 16 are provided. A plurality of bridge portions 29° and a plurality of space portions 30 are alternately formed in the central magnetic body 25. Next.

As shown in FIG. 5(b), magnetic bodies 28 are bonded to both sides of the central magnetic body 25, and the space 30 is filled with an inorganic adhesive as a spacer 31 to form a magnetic block 32. The distance between the left and right magnetic bodies 28 is kept constant by the bridge portion 29 until the adhesive dries. Furthermore, since the bridge portions 29 are located at both ends of the space 30, the width of the space 30 does not vary and the thickness of the spacer 31 is also kept constant. After the adhesive dries, a portion indicated by a chain line is cut within the plane including the bridge portion 29, and the core assembly 33 is separated as shown in FIG. 5(c). Therefore, this core assembly 33 has a center core 9 formed by dividing the central magnetic body 25 , side cores 8 formed by dividing the magnetic body 28 , and a spacer 31 . Next, the medium contacting surface 14 is formed as shown in FIG. 5(d), and further, as shown in FIG. 5(e).
The core assembly 33 is sliced in a direction perpendicular to the gap 15 and divided into a plurality of pieces as shown in FIG. - In this way, a large number of head cores can be efficiently manufactured by dividing the magnetic block 32 into a plurality of core combination bodies 33 and slicing them.

Similarly, sixth, seventh, and third embodiments in which a plurality of core combinations are formed from magnetic blocks will be shown below.

FIGS. 6(a) to (d) show a sixth embodiment of the present invention. A central magnetic body 34 formed by joining the magnetic plates 26 to both sides of the magnetic plate 27 is provided.

As shown in FIG. 6(a), a plurality of bridge portions 29 are formed on the magnetic plates 26 on both sides, protruding inward from each other and continuous by a part of the magnetic plate 27 in the middle, and these bridge portions 29 In between, a plurality of spaces 30 are partitioned by magnetic plates 27 and are formed over two sides. Next, as shown in FIG. 6(b), the magnetic bodies 28 are bonded to both sides of the central magnetic body 34, and the space 30 is filled with an inorganic adhesive as a spacer 31 to form a magnetic block 35.

By cutting this at the position shown by the dashed line, it is divided into a plurality of core combination bodies 36 as shown in FIG. 6(c), and the medium contacting surface 14 is divided as shown in FIG. 6(d). Form.

The core combination body 36 formed in this way has the magnetic body 28
T! : It has a side core 8 formed by dividing it, and a center core 9 formed by dividing the central magnetic body 28, but the center core 9 is separated into three magnetic parts by two spacers 31, and the central magnetic part is divided into three magnetic parts. functions as

FIG. 7 shows a magnetic block 37 in a seventh embodiment of the invention. The central magnetic body 38 is a magnetic plate 39
, with magnetic plates 27 facing each other on both sides, and a plurality of bridge parts 29 extending to both sides and abutting the magnetic plates 27 are formed on the middle magnetic plate 39. Therefore, between these bridge parts 29, A plurality of spaces 3 filling spacers 31
0 is formed. If such a magnetic block 37 is separated along a dashed line, a core assembly 36 shown in FIG. 6(c) will be formed.

FIG. 8 shows a magnetic block 40 in a fourth embodiment of the invention. In this embodiment, the central magnetic body 41 is formed in one piece, and the central magnetic body 41 has a plurality of spaces 30 formed on two sides, and bridge parts located at both ends of these spaces 30. 29 is formed. Therefore, if this magnetic material block 40 is separated at the position shown in the single-dot chain diagram, FIG.
) will be formed.

Effects of the Invention Since the present invention is configured as described above, the distance between two gaps can be accurately and easily determined by the bridge portion regardless of variations in the thickness of the spacer and the thickness of the adhesive layer of the spacer. .

By providing a magnetic material in a part of the spacer, the magnetic shielding effect can be improved, and by making the spacer longer than the depth of the groove, it can be used as a mounting piece for a magnetic recording device or as part of a terminal board. You can also
By forming a plurality of spaces and a bridge part in the center core and inserting a magnetic plate spacer into the space, when the bridge part is cut, the center core is separated into a plurality of magnetic plates insulated by the spacers. The magnetic plate in the center can be used as a center shield member, and the core combination can be sliced in the direction crossing the gap or the magnetic block can be divided to form the core combination. This has the advantage that head cores can be efficiently mass-produced.

[Brief explanation of drawings]

Figures 1 (a) to f) relate to the first embodiment of this invention and are perspective views shown in the order of steps, and Figures 2 (a) to c) relate to the second embodiment of this invention. 3(a) and 3(b) are perspective views showing the main steps in order according to the third embodiment of the present invention, and FIG. 4(a) is a perspective view showing the main steps in order. Figure 5 (c) is a perspective view showing the main steps in order according to the fourth embodiment of the present invention, and Figures 5 (a) to e) are perspective views showing the main steps according to the fifth embodiment of the invention. FIG. 6(a) is a perspective view showing the steps in order.
to (d) are perspective views showing the main steps in order according to the sixth embodiment of the present invention, and FIG. 7 is a perspective view showing a magnetic block according to the seventh embodiment of the present invention.
FIG. 8 is a perspective view showing a magnetic block according to a fourth embodiment of the present invention, and FIGS. 9 to 11 are perspective views showing one process of conventional bonding work. 8...Side core, 9...Center core, 10...
Bridge portion, 11...Groove (space portion), 12...Spacer. 13...Core assembly, 14...Medium contacting surface, 15...
Gap, 22...Magnetic plate, 23...Adhesive (non-magnetic surface), 24...Spacer having magnetic plate, 25...
- Central magnetic body, 28... Magnetic body, 29... Bridge portion, 30... Space portion, 31... Spacer, 32... Magnetic block, 33... Core combination body, 34... Central magnetic body, 35... Magnetic block, 36... Core combination body, 37... Magnetic block, 38... Central magnetic body, 40... Magnetic block, 41... Central magnetic Body figure 35 (C)

Claims (1)

[Claims] 1. The side cores are adhered to both sides of a center core in which a bridge part and a space part are formed to define an interval between two side cores, and at least both sides of the side cores are provided with non-magnetic surfaces. A spacer is fixedly inserted into the space to form a core combination in which the side cores, the center core, and the spacer are combined at once, and one surface of the core combination including the bridge portion is slid. A method for manufacturing a head core for a magnetic head, characterized in that a medium contacting surface is formed on one surface of the core assembly by cutting the core assembly. 2. A method for manufacturing a head core of a magnetic head according to claim 1, characterized in that a spacer having a magnetic plate as a part is used. 3. A method of manufacturing a head core for a magnetic head according to claim 1 or 2, wherein the space is formed by a groove. 4. The method for manufacturing a head core of a magnetic head according to claim 3, wherein the length of the spacer is made longer than the depth of the groove. 5. Glue the side cores to both sides of the center core, which has a bridge part that defines the interval between the two side cores and a plurality of spaces arranged along this bridge part, and place non-magnetic spacers in the spaces. A core assembly is formed by bonding the side cores, the center core, and the spacer together, and one surface of the core assembly including the bridge portion is cut smoothly to form a medium on one surface of the core assembly. A method for manufacturing a head core of a magnetic head, characterized in that a contact surface is formed. 6. The side cores are adhered to both sides of the center core in which a bridge part and a space part are formed to define the interval between the two side cores, and a spacer having a non-magnetic surface is attached to at least both sides of the side core side in the space part. The side core, the center core, and the spacer are fixedly inserted into the spacer to form a core assembly in which the side cores, the center core, and the spacer are combined at once, and one surface of the core assembly including the bridge portion is smoothly cut to form a core assembly. A magnetic head characterized in that a medium contacting surface is formed on one surface of the core combination, and the core combination is sliced by crossing a gap between the side core and the center core. Head core manufacturing method. 7. A central magnetic body in which a plurality of bridge parts defining an interval between two vertically elongated magnetic bodies are formed along the longitudinal direction of the magnetic bodies, and a plurality of spaces located between these bridge parts are formed. At the same time, a spacer having a non-magnetic surface on at least both outer surfaces is fixedly inserted into the space, and these magnetic materials, the central magnetic material, and the spacer are bonded at the same time. two side cores formed by forming a combined magnetic block, and separating the magnetic block in a plane including the bridge portion to divide the magnetic body; a center core formed by dividing the central magnetic body; 1. A method of manufacturing a head core for a magnetic head, comprising: forming a plurality of core combinations having a spacer; and forming a medium contacting surface on one surface of these core combinations. 8. A central magnetic body in which a plurality of bridge portions defining an interval between two vertically elongated magnetic bodies are formed along the longitudinal direction of the magnetic bodies, and a plurality of spaces located between these bridge portions are formed. At the same time, a spacer having a non-magnetic surface on at least both outer surfaces is fixedly inserted into the space, and these magnetic materials, the central magnetic material, and the spacer are bonded at the same time. two side cores formed by forming a combined magnetic block, and separating the magnetic block in a plane including the bridge portion to divide the magnetic body; a center core formed by dividing the central magnetic body; forming a plurality of core combinations having a spacer, forming a medium contacting surface on one surface of these core combinations, and intersecting the gap between the side cores and the center core to form a plurality of core combinations having a spacer. A method for manufacturing a head core of a magnetic head, characterized by slicing the core.