JPH04307418A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head easy to assemble with excellent dimensional accuracy in the manufacture of the magnetic head in which a core with a magnetic gap if fixed between sliders. CONSTITUTION:A reading/writing/erasing core (core) 24 which comprises a closed magnetic path and which is provided with a reading/writing gap (magnetic gas) 25 and an erasing gap (magnetic gas) 26 is fixed to a slider body 27 formed with a non-magnetic material, and the slider body 27 is ground and divided into two sliders 30 and 31 which fix the reading/writing/erasing core 24 between them.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head for a flexible disk in which a core having a magnetic gap is sandwiched between sliders.

0002

[Prior Art] In recent years, magnetic heads for flexible disks have become smaller and have larger capacities, and the core width for recording and reproduction has increased to 33 mm.
The track width tends to be narrower, from 0 μm to 150 μm or less, and the erasing core width also ranges from 160 μm to 90 μm or less. Furthermore, the distance between the recording/reproducing core gap and the erasing gap tends to be from 0.8 mm to 0.3 mm or less, and in magnetic heads with such a structure, the gap is an important parameter in magnetic properties. It has become necessary to control the dimensional accuracy of the length, gap depth, and gap spacing very strictly, and there is also a strong demand for simplifying the structure and pursuing workability in order to meet lower prices.

Conventionally, this type of magnetic head is shown in FIG. 3(a).
The configuration was as shown in FIG. 4(b), FIGS. 4(a) and 4(b), or FIGS. 5(a) and (b). The configuration will be explained below.

FIGS. 3A and 3B show a laminate type magnetic head, which includes a read/write core 2 having a read/write gap 1, erase cores 5 and 6 having erase gaps 3 and 4, respectively, and a reinforcement core. The sliders 7 and 8 are bonded together using a bonding resin material, and laminated and cured. Slider 7 has a medium
Ski grooves 9 are provided to improve adhesion to the base.

FIGS. 4(a) and 4(b) show a straddle type magnetic head with a read/write core 11 having a read/write gap 10 and erase gaps 12, 13 formed between the read/write core 11. It is composed of erase cores 14 and 15 and sliders 16 and 17 arranged in the same direction.

FIGS. 5(a) and 5(b) show a bulk type magnetic head, in which a read/write and erase core 20 having a read/write gap 18 and an erase gap 19, and reinforcing sliders 21 and 22 are bonded with a resin material. They are bonded together and laminated and cured. The slider 21 is provided with ski grooves 23 to improve adhesion to the medium.

Among these magnetic heads, the straddle type requires many man-hours to manufacture, has a poor S/N ratio, and is difficult to manufacture at high track densities.Currently, the straddle type or the laminate type or bulk type is used. has become the mainstream magnetic head for flexible disks.

[0008]

Problems to be Solved by the Invention In such conventional laminate type or bulk type magnetic heads, 1
When bonding three or five cores and two sliders, jigs, equipment, or parts are required to maintain the bonded state of each, making assembly work extremely difficult. However, it lacks mass productivity and has the problems of high cost. Furthermore, even if jigs, equipment, or parts are used to maintain the bonded state, it is extremely difficult to stably manage the misalignment of each piece of bonding, and to continuously maintain a perfect bonded state. Furthermore, there was a problem in that the ski grooves 9 or 23 provided on the slider 7 or 21 had to be formed by grinding the sliders alone or after they were bonded together.

The present invention solves the above problems, and aims to provide a magnetic head that is easy to assemble and has good dimensional accuracy.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention fixes a core forming a closed magnetic path and having a magnetic gap to a slider body made of a non-magnetic material, and then grinds the slider body. , the problem is solved by dividing the core into two sliders that sandwich the core.

[0011]

[Operation] The present invention uses the above-mentioned means to solve the problems, and as a result, there is no need for a jig to maintain the bonded state during the assembly process, making the assembly easy and improving the dimensional accuracy between the two divided sliders and the core. can.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in the figure, the read/write/erase core 24 has a read/write gap (magnetic gap) 25 and an erase gap (magnetic gap) 26, which constitute a closed magnetic path (not shown). are doing. The slider body 27 is made of a non-magnetic material, and has ski grooves 28 formed on the medium sliding surface and core insertion grooves 29 formed on the core fixing surface. These ski grooves 28 and core insertion grooves 29 may be formed during firing, or may be formed by molding after firing.

The read/write/erase core 24 is inserted into the core insertion groove 29, and the read/write/erase core 24 is bonded and fixed to the slider body 27 to be integrated with a bonding resin material or glass filling (not shown). Thereafter, the surface of the slider body 27 is ground to the ground surface. At this time, the depth of the core insertion groove 29 has been confirmed in advance, and the gap depth dimensions of the read/write and erase cores 24 are known, so the amount of grinding to achieve the required gap depth is Can be set. As a result, the slider body 27 is divided into two sliders 30 and 31 that sandwich the read/write/erase core 24, and the read/write gap 25 and erase gap 26 of the read/write/erase core 24 are exposed and the desired A magnetic head is obtained.

This is because in the bulk type magnetic head shown in FIG. 5, when the read/write/erase core 20 is bonded using the sliders 21 and 22, the bonding adhesive flows out into the bonded portion, causing the gap depth to increase. Compared to the case where measurements cannot be made and the gap depth cannot be adjusted, stable characteristics as a magnetic head can be obtained and accuracy is also improved.

As described above, according to the magnetic head manufacturing method of the embodiment of the present invention, the read/write and erase cores 2 having the read/write gap 25 and the erase gap 26 are provided.
4 is fixed to a slider body 27 made of a non-magnetic material, and then the slider body 27 is ground, read/write,
Two sliders 30, 3 that sandwich the erase core 24
Because it is divided into 1 parts, there is no need for jigs to maintain the joint state during the assembly process, making assembly easier and improving the dimensional accuracy between the divided sliders 30 and 31 and the read/write and erase cores 24. You can improve. Furthermore, since the ski grooves 28 were formed on the medium sliding surface and the core insertion grooves 29 were formed on the core fixing surface when molding the slider body 27,
Grinding is not required after forming the slider body 27 or the magnetic head, and the manufacturing process can be simplified.

Although the above embodiment uses a read/write core and an erase core 24, a read/write core and an erase core can also be manufactured in the same manner.

[0018]

As is clear from the above embodiments, according to the present invention, a core forming a closed magnetic path and having a magnetic gap is fixed to a slider body made of a non-magnetic material, and then the slider body is ground. Since the core is divided into two sliders that sandwich the core, there is no need for a jig to maintain the bonded state during the assembly process, and assembly is easy and costs can be reduced. A magnetic head with good dimensional accuracy between the magnetic head and the core can be obtained.

[Brief explanation of drawings]

FIG. 1: (a) An exploded perspective view of a manufacturing process of a magnetic head manufacturing method according to an embodiment of the present invention; (b) A perspective view of a magnetic head obtained by the same manufacturing method.

[Figure 2] Top view of the magnetic head obtained by the same manufacturing method

[Figure 3] (a) An exploded perspective view of an example of a conventional magnetic head (
b) Top view of the magnetic head

[Fig. 4] (a) An exploded perspective view of an example of a conventional magnetic head (
b) Top view of the magnetic head

[Fig. 5] (a) Exploded perspective view of an example of a conventional magnetic head (
b) Top view of the magnetic head

[Explanation of symbols]

24 Read/write, erase core (core) 25
Read/write gap (magnetic gap) 26 Erase gap (magnetic gap) 27 Slider body 30 Slider 31 Slider

Claims (2)

[Claims] 1. A magnetic device in which a core forming a closed magnetic path and having a magnetic gap is fixed to a slider body made of a non-magnetic material, and then the slider body is ground and divided into two sliders sandwiching the core. Head manufacturing method. 2. The method of manufacturing a magnetic head according to claim 1, wherein a slider body is used which has ski grooves formed on the medium sliding surface and core insertion grooves formed on the core fixing surface.