JPS58218016A - Case for button type magnetic head - Google Patents

Abstract

PURPOSE:To improve easily the accuracy of dimension of each part of a titled case, especially the center opening, by forming case sides in the shape of octagon so as to form the case sides as the reference plane of the center opening of the case front. CONSTITUTION:The outer sides of the case 30 is formed as an octagon. The case front surface 30a is formed into a spherical surface having a large radius of curvature, and the center is provided with the center opening 31 extending toward the running direction of a magnetic recording medium. In forming this, one outer side of the octagonal case, i.e., one side surface 32 in parallel with the running direction of the magnetic recording medium, is designated as the reference plane and the processing is done by determining distances L, L'... from this plane. Since the reference plane is a flat plane, a simple processing jig is used, the high dimensional accuracy is attained for the center opening and the entire case, allowing to improve the accuracy of the button type magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a button-type magnetic head used in magnetic disk storage devices and the like, and particularly to the structure of its case.

The magnetic head of a magnetic disk storage device (magnetic disk device), which serves as the external storage device of a computer, performs operations such as writing, reading, and erasing information on a magnetic disk, which is a magnetic recording medium. It is something. In recent years, the storage capacity of magnetic disk devices has been increasing, and along with the miniaturization of devices, there has been a demand for higher recording densities.
In order to improve this recording density, efforts are being made to improve the bit density and track density of magnetic disks and to improve the accuracy of the magnetic head itself. To increase track density,
Erase cores are placed on both sides of the front of the write/read core,
A magnetic head is used in which this magnetic head is integrated into a button-shaped case or holder. In this case, the magnetic gap position of the erasing core is shifted to the downstream side in the running direction of the magnetic medium (magnetic disk) with respect to the gap position of the write/read shear, and the erasing core The circumferential edge of the track on the disk surface formed by the reading core is arranged. As such magnetic heads, there have been conventionally known ones called the tunnel erase type or the strike two dollar type, depending on the configuration of the erasing core. Figure 1 shows the front part of a conventional straddle type magnetic head (fill facing the magnetic disk).
FIG. 2 is a front sectional view showing a partially exploded front view of the magnetic head shown in FIG. Note that the running direction of the magnetic disk is the direction shown by the arrow in FIG. 2, and therefore, FIG. FIG. Example: A circular hole 10a is drilled in the front of the button-shaped case 10 at the front of the RAD, a circular non-magnetic slider is embedded in this hole 10a, and an elongated through hole 2 extending in the disk running direction is drilled in this slider. It is being A write/read core 3 is exposed from this through hole 2 to the front surface of the head. A pair of erasing cores 4 and 5 are disposed on both sides of the writing/reading core, and the width of the erasing core 4 and 5 is bent toward the front as shown in FIG. Only the narrow part is not exposed to the front surface of the head from the through hole 2 of the magnetic slider (see Figure 2). An erasing magnetic gap is located on the downstream side of the magnetic gap 6 in the disk traveling direction, and is formed between each erasing core 4.5 and the central writing successive core 3.

In this conventional straddle type magnetic head, a slider with a through hole 2 is pre-assembled into the front part of the case, and an erasing core and a writing/reading core are later assembled into the through hole of the slider. Therefore, the assembly is extremely difficult and requires a lot of effort, and there is also a step misalignment between these cores and the slider, and furthermore, the gap between the core and the through hole of the slider or the space on the back side of the slider is filled. Bubbles may form in the welded glass.

On the other hand, as shown in FIG. 3, a non-magnetic block 13 is fixed to the front outer part of the erasing core 12, and the erasing core 12 is fixed to the upstream and downstream sides in the running direction of the magnetic recording medium. Non-magnetic slider block from jf4 +
14' and sandwiched with 'Erasing tips'.

Construct the solid body 11. This erasing core assembly 11 is
・.

The erasing core assembly 11 and the writing/reading core assembly 3, which were arranged on both sides of the front part of the writing/reading core assembly 3 and assembled to each other in this way, were assembled into a button-shaped case 20. A wholesaler magnetic head has been proposed, in which case - the core position of the erasing core assembly 11 is located in the write/read magnetic gap 6;
The position of the magnetic recording medium is also assembled so as to be located slightly downstream in the traveling direction of the magnetic recording medium (in the direction of the arrow in FIG. 3). An erasing magnetic gap 18, 19 is formed between the erasing core 12 and the write/read core assembly 3 with the non-magnetic material 17 interposed therebetween. The button-shaped case 20 is provided with a center opening 21 in the center of its front face, which matches the outer shape of the front part of the magnetic circuit section formed by assembling the above-mentioned erasing core assembly 11 and write/read core assembly 3. When this magnetic circuit section is assembled into the case 20, its front surface is exposed from the center opening 21 of the case 20, and the entire front surface is polished after assembly so that it becomes a smooth curved surface.

As can be seen from the explanations of FIGS. 1 to 3, in the magnetic head of L Wholesaler, the position of the front window, that is, the front center opening, of the case that houses the magnetic circuit section consisting of the core assembly for erasing and continuous writing, and The dimensional accuracy of the shape is extremely important. If the dimensional accuracy of this opening is poor, the position of the magnetic gap in the magnetic circuit section is misaligned), and a gap is created between the magnetic circuit section and the center opening on the front surface of the case, which deteriorates the characteristics of the magnetic head. In the case of a conventional button-type magnetic head, the outermost circumferential portion of the case is cylindrical as shown in No. 4 22, and therefore there is no surface that can be used as a reference for positioning the central opening 21. ,
It was extremely difficult to achieve the dimensional accuracy of the opening in manufacturing. This is one of the obstacles to improving the accuracy of the button-type magnetic head itself.

The present invention was made to solve this problem, and it is easy to make each part of the case, especially the center opening and dimensional accuracy, and to store the magnetic and air circuit parts and assemble it as a magnetic head. The object of the present invention is to provide a case structure for a button-type magnetic head that is easy to use.

For this purpose, in the present invention, the side part of the case is formed into a large rectangular outer shape so that the side part of the case can be used as a reference plane for the central opening of the front part of the case.

According to one embodiment of the present invention, the large square is formed into a regular octagon, and the case is symmetrically divided into two parts at a point other than the vertex of the large square, and the case side surface parallel to the dividing plane is A case structure is provided in which the central opening of the case front serves as a reference plane.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a front view of a lead magnetic head according to an embodiment of the present invention, and FIG. 5 is a side view as seen from arrow F in FIG. The magnetic circuit inside the case is shown in Figures 1 and 2.
This is the same as explained in the figure. Case 3 of this example
0 has a button-like shape as a whole, but its outer part has a hexagonal outer shape as clearly shown in FIG.

The case front surface 30a is formed into a gentle spherical surface, and a central opening 31 extending in the running direction of the magnetic recording medium is bored in the center thereof. To form this opening 31, one outside -° of this hexagonal case, i.e. magnetic recording, 1□, 0
11 years old □□1. .

Distances L and L' from this plane are determined and processed. Since the reference surface is a flat surface, the processing jig is simple, and high dimensional accuracy of the center opening and the entire case can be obtained, and as a result, the accuracy of the button-shaped magnetic head can be improved. As mentioned above, in conventional button-shaped cases, the outermost part is circular, so it is difficult to take a reference plane, and the positioning of the case during processing is not accurate, making it impossible to improve the positioning accuracy of the opening. According to this embodiment, such a problem does not occur.

FIG. 6 is a front view of a case according to another embodiment of the present invention. In this case, the case 3o is symmetrically divided into two parts at the center and along the running direction of the magnetic recording medium. Divide each half-break 33.34 of case 3o: face 37
．． When joined at 38, the external shape forms a regular octagon.

In this case as well, parallel to the running direction of the magnetic recording medium for each case half-way □ 1tllln35・36 *,,8',! h $m
+! The dimensional accuracy of the case can be increased by 11 degrees by setting the 1/dividing surface 0 grinding dimension to the ``111'' center 1031 to the ``C'' dimension. A magnetic circuit section of the type shown in Figure 3 is housed.Because the case 3° is divided into two parts, it is extremely easy to house the magnetic circuit section and assemble the magnetic head, which improves accuracy and eases assembly. This will also reduce costs.

In both the embodiments shown in FIGS. 4 and 6, the outer shape of the case is symmetrical with respect to the center of the case, so that the balance during operation of the magnetic head is not lost.

[Brief explanation of drawings]

Figure 1 is a partial front sectional view showing the front part of a conventional button-type magnetic head partially exploded, Figure 2 is a diagram showing the front side of the magnetic head shown in Figure 1, and Figure 3. 4 is a diagram showing the front side of a button-type magnetic head according to another conventional example, FIG. 4 is a diagram showing the front side of a button-type magnetic head using a case according to an embodiment of the present invention, and FIG. FIG. 6 is a side view of the magnetic head shown in FIG. 6, and FIG. 6 is a diagram showing a case in a separated state according to another embodiment of the present invention. 30...Button-shaped case, 30a...Case front,
31... Center opening, 32.35.36... Case side (reference surface), 33.
34...Case half off, 37.38...Divided surface. Agent Patent Attorney Toshiyoshi Somekawa Figure 1 Figure 2 Figure 3 Figure 4:', Figure 15

Claims (2)

[Claims] (1) A case for a button-shaped magnetic head, characterized in that the side surface of the case is formed into an octagonal outer shape so that the side surface of the case can be used as a reference surface for the central opening of the front part of the case. (2) The octagon is vertically divided symmetrically at a portion other than the apex, and a side surface of the case parallel to the dividing plane is used as a reference plane for the central opening of the front part of the octagon. The ability of the button-shaped magnetic helmet described in Section 1.
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