JPH0664691B2 - Processing method of core for magnetic head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for magnetic recording and reproduction, and more particularly to an improvement in a core processing method that facilitates processing of a core that constitutes this magnetic head. .

[Conventional technology]

Conventionally, magnetic heads used for floppy disks, etc.
In order to improve the quality of the core, which is the main part of the core, precision manufacturing is required for its production, and there is a drawback in that the processing method requires much labor and time.

FIG. 7 to FIG. 11 show processing steps of a conventional general magnetic head core. First, in FIG.
Reference numerals 10 and 12 denote side cores made of a magnetic material, 14 denotes a center core, and a magnetic read / write unit penetrating from the upper surface to the lower surface along a boundary portion where the center core 14 and the side cores 10 and 12 are joined. Hole forming
16 and a hole 18 forming a magnetic erased portion, respectively,
The center core 1 is filled with glass while filling these holes 16 and 18.
4 and each of the side cores 10 and 12 are joined by glass bonding as shown in the figure to form a constant core block 20 composed of a laminated structure.

Next, as shown in FIG. 8, the core block 20 is sliced by a slicing machine or the like to form a core unit 22.
To get As shown in FIG. 9, each of the obtained core units 22 is highly accurately ground and mirror-finished on both side surfaces 24 and 26 including the lapping allowance, and the core is entirely dimensioned.
A bulk type magnetic read / write section and erase section are properly formed on the upper surface.

Thereafter, as shown in FIG. 10, sliders 28 and 30 are bonded and fixed to the upper portions of both side surfaces 24 and 26 of the core unit 22 by an adhesive or the like, and then, as shown in FIG. The coils 34 and 36 are attached to the side core portions 10a and 12a of the
By fixing the rear core piece 32 to the bottom of 24,
A magnetic head core 38 is configured.

[Problems to be solved by the invention]

However, in the above-described conventional magnetic head core, the core unit 22 is configured by slicing the core block 20 into a uniform thickness.
Must be ground with high precision over the entire surface to perform full-thickness core dimension processing, and both side surfaces 24, 26 must be mirror-finished in order to form proper mounting surfaces for the slider and the rear core piece. Therefore, according to the conventional magnetic head core, there are problems that the number of portions to be processed with high precision is increased, the processing steps are considerably complicated, and the time required for processing is lengthened.

Therefore, an object of the present invention is to provide a method of processing a magnetic head core which can simplify the processing of the magnetic head core, enable high-precision assembly, and can be manufactured in a short time and at low cost.

[Means for solving problems]

A method of processing a core for a magnetic head according to the present invention comprises a core block in which side cores are joined and fixed to both sides of a center core, and holes for forming a read / write portion and an erase portion are aligned along the joint end faces of these core blocks. After the core block is sliced to a predetermined thickness to form a core unit, sliders are bonded and fixed to both side surfaces of the upper end portion of the core unit where the hole is provided, and a coil is attached to the side core portion. In a method of processing a core for a magnetic head, which is formed by joining and fixing a rear core piece to one side surface of a lower end portion of the core unit, a groove having a predetermined size is formed on the upper end portion of the core block with a mirror finish before slicing the core block. And then slice the core block along the center line of these grooves to form the core unit 1, After mirror-finished to one of slice plane A unit, characterized in that fixedly joined slider and coil and a rear core pieces respectively.

[Action]

According to the magnetic head core processing method of the present invention, before slicing the core block to form the core unit, the upper end portion on the side where the slider is mounted is preliminarily grooved and mirror-finished to a predetermined size. Form the slider mounting surface,
Then, by slicing the core block along the center line of the groove, the rear core piece can be properly joined and fixed only by mirror-finishing only one sliced surface of the core unit. Therefore, with such a configuration, the entire thickness machining and mirror finishing over the entire surface of the core unit are largely omitted, and the machining process can be simplified and the machining work can be facilitated and shortened.

〔Example〕

Next, an embodiment of a method of processing a magnetic head core according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 6 show an embodiment of a process for processing a magnetic head core according to the present invention. In this embodiment, for convenience of explanation, the same components as those of the conventional magnetic head core shown in FIGS. 7 to 11 will be described with the same reference numerals.

FIG. 1 shows a core block 20, and its structure is similar to that used in the conventional magnetic head core shown in FIG. 7. Therefore, the same reference numerals are attached to the structure. The description is omitted. However, in this embodiment, first, as shown in FIG. 2, the upper portion of the core unit 22 is cut into a groove shape in relation to the positions of the holes 16 and 18 provided on the upper surface of the core block 20, and the total thickness of the core unit 22 is reduced. Mirror finish by machining, bulk type magnetic read / write section and erase section are formed on the upper surface, and slider mounting surfaces 42 and 44 respectively.
To form.

Then, the grooved core block 20 is
As shown in the figure, the core unit 22 is formed by slicing along the center line of each groove with a slicing machine or the like. In the core unit 22 configured in this way, the stepped portion 40 is provided between the sliced surface and the grooved surface, and the grooved portion is already full thickness processed as the slider mounting surfaces 42, 44. In addition, since it is mirror-finished, it suffices to perform a process for attaching the rear core piece 32 to the sliced one side surface.

Therefore, as shown in FIG. 4, the sliced one side surface of the core unit 22 is appropriately mirror-finished to form a rear core piece mounting surface 46. In this way, in the process of processing the core unit 22, the slider mounting surfaces 42, 44 and the rear core piece mounting surface 46 can be simply and sequentially formed. As shown in FIG. 5, the core unit 22 processed as described above is mounted on the slider mounting surfaces 42, 44 with respect to the slider 28,
After joining and fixing 30 with an adhesive or the like, as shown in FIG. 6, the coils 36 and 34 are attached to the side core portions 10a and 12a of the core unit 22, respectively, and the core unit 22 is attached.
A magnetic head core can be constructed by fixing the rear core piece 32 to the rear core piece mounting surface 46.

〔The invention's effect〕

As is apparent from the above-mentioned embodiments, according to the present invention,
When processing the core unit from the core block, in the finishing process of the mounting surface where the pair of sliders and the rear core piece are respectively mounted, the important points to be the erasing parts of the pair of sliders are grooved before slicing the core unit from the core block. High-precision full-thickness machining and mirror finishing, and after slicing the core block, only the mounting surface of the rear core piece needs to be mirror-finished. The machining process is simplified without the need for machining and mirror finishing.

That is, according to the processing method of the magnetic head core of the present invention, the total thickness processed portion and the mirror-finished portion are reduced as compared with the conventional processing method, so that the working time required for processing can be significantly shortened, Since the processing is performed only on the portion where accuracy is required, a product having stable quality can be manufactured in a short time, and the manufacturing cost of this kind of magnetic head core can be significantly reduced.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief description of drawings]

1 to 6 are perspective views of respective cores showing an embodiment of a magnetic head core processing step according to the present invention, and FIGS. 7 to 11 are conventional magnetic head core processing steps. It is a perspective view of each core. 10,12 …… side core 10a, 12a …… side core part 14 …… center core 16,18 …… hole filled with glass 20 …… core block, 22 …… core unit 24,26 …… side, 28,30… … Slider 32 …… Rear core piece, 34,36 …… Coil 38 …… Magnetic head, 40 …… Step 42,44 …… Slider mounting surface 46 …… Rear core piece mounting surface

Claims (1)

[Claims] 1. A core block, in which side cores are joined and fixed to both sides of a center core, and holes for forming a read / write portion and an erase portion are aligned along the joint surface of these cores, and the core block is formed in a predetermined shape. After slicing to a thickness to form a core unit, the sliders are joined and fixed to both sides of the upper end where the hole of the core unit is provided, and a coil is attached to the side core part, and further, one side of the lower end of the core unit is attached. In the method of machining a core for a magnetic head, in which a rear core piece is joined and fixed, a groove of a predetermined size is machined on the upper end of the core block before slicing the core block together with a mirror finish, and then the center lines of these grooves are processed. Slice the core block along to form a core unit, and with respect to one slice surface of the core unit A method for processing a core for a magnetic head, characterized in that the slider, the coil and the rear core piece are bonded and fixed to each other after mirror finishing.