JPS6153764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for a digital recording device such as a flexible disk and a method for manufacturing the same.

This type of magnetic head has a configuration as shown in Figures 1a and 1b, and Figure 1a is an exploded perspective view showing the main components of the magnetic head.
2 is a recording/reproducing core in which a recording/reproducing gap 1a is formed in advance; 2 is an erasing core 3 disposed in parallel on both sides of the recording/reproducing core 1; 4 is a non-magnetic material such as glass provided on the erasing core 2; 4 is the erasing core 2; Groove 4a to insert
It is a fixed frame made of ceramic etc. with These components are assembled using a jig (not shown), as shown in Figure b, by first instantaneously fixing them with an organic adhesive and then melting the glass to bond them together. . At this time, an erasing gap 2a is formed at a predetermined distance between the side surface of the recording/reproducing core 1 and the erasing core 2.

However, in the magnetic head having the above structure, since the two erasing cores 2, 2 are separated and independent, the installation work is complicated, and as shown in FIG. , 2 is difficult, the positional dimension A of the recording/reproducing gap 1a and the erasing core 2, and the dimension B of the erasing gap 2a vary, and the yield is reduced.

The present invention solves the above-mentioned drawbacks and provides a magnetic head that is easy to assemble and has high assembly accuracy, and a method for manufacturing the same.

Below, the present invention will be explained with reference to the drawings.
Figures 3a to 3e show a method of manufacturing an eraser core chip. Figure 3a shows a rectangular parallelepiped block 5 made of ferrite, sendust, etc., which is the core material. First, as shown in Figure 3b, Then, a groove 6 having a desired shape is formed by cutting a part of the lower surface side (on the drawing) of the block body 5. Next, as shown in FIG. 3c, the groove portion 6 is filled with a non-magnetic material 3 such as glass. Next, as shown in FIG. 4D, a kerf 7 is provided extending from the center of the upper surface of the block body 5 to the non-magnetic material 3, and the kerf 7 is composed of a wide portion 7a and a narrow portion 7b. Also, both side surfaces of the block body 5 are shaved off into a predetermined shape. Finally, as shown in FIG. 5E, the block body 5 is cut out to a predetermined thickness to produce an eraser core chip 8 in which the two eraser cores 2 are integrated with the nonmagnetic material 3.

4 and 5 illustrate the assembly of the erasing core chip 8 and the recording/playback core 1.
is the ferrite that formed the recording/playback gap 1a,
A recording/playback core made of Sendust etc., and the core 1
from the end face 1c of one leg 1b of the gap 1
The dimension C up to a is preset to a predetermined value. Therefore, the side surface of the non-magnetic material 3 of the erasing core chip 8 is attached to the end surface 1c of the leg portion 1b of the recording/reproducing core 1.
The recording/reproducing core 1 is inserted into the cut groove 7 of the erasing core chip 8. At this time, the width E (see FIG. 3 e) of the narrow width portion 7b of the kerf 7 and the thickness F of the recording/reproducing core 1 are approximately the same dimension, and the core 1 is placed in the narrow width portion 7b. Fitted. The width D (see FIG. 3 e) of the wide portion 7a of the cut groove 7 is also set in advance so as to obtain a predetermined width of the erasing gap 2a between the side surface of the recording/reproducing core 1 and the erasing cores 2, 2. The width of each erasing gap 2a is accurately given by the formula 1/2 (D-F).

The recording/reproducing/erasing cores 1 and 2 combined by the above method are held by a fixed frame 4 having a groove 4a as shown in FIG. 6, and bonded by melting a bonding material such as glass. Furthermore, in order to configure a magnetic head for a flexible disk, a rear core 9 of the recording/playback core 1 is attached, and a U is attached to the rear of the core 9 to magnetically bridge the two erasing cores 2, 2.
A letter-shaped rear core 10 is provided. Note that 11 is a coil for recording and reproduction, and 12 is a coil for erasing. Also, the front surface of the magnetic head is finally polished into a spherical shape.

As mentioned above, the present invention has two waste cores 2, 2.
are combined with the non-magnetic material 3 to erase the core chip 8.
Since the two erasing cores 2, 2 are integrated, handling and assembling operations are extremely simple. Furthermore, since the erasing core chip 8 is provided with a cut groove 7 consisting of a wide part 7a and a narrow part 7b, and the recording/playback core 1 is inserted into the cut groove 7, the erase core chip 8 and the recording/playback core 1 are inserted into the cut groove 7. Positioning with the core 1 is facilitated, and the dimensions of the cut groove 7 can be determined with high accuracy by cutting, etc. Therefore, the side surface of the recording/reproducing core 1 formed within the wide width portion 7a and the eraser are easily aligned. This brings about remarkable effects such as making it possible to make the width dimension of the erasing gap 2a between the core 2 and the core 2 highly accurate.

Further, as explained in the above embodiment, the dimension C from the end surface 1c of the leg portion 1b of the recording/reproducing core 1 to the recording/reproducing gap 1a is set in advance to a predetermined value, and the erasing core chip 8 is placed on the side surface of the non-magnetic material 3. If assembled in such a way that the recording/reproducing gap 1a and the erasing core 2 are assembled so as to come into contact with the end surface 1c of the recording/reproducing core 1, the positioning of the recording/reproducing gap 1a and the erasing core 2 can be reliably achieved.

[Brief explanation of the drawing]

1A and 1B are perspective views of the main parts of a conventional magnetic head, FIG. Regarding the head, FIGS. 3a to 3e are perspective views of main parts showing the manufacturing process of the erasing core chip, FIGS. 4 and 5 are perspective views illustrating the assembly of the recording/playback core and the erasing core, respectively, and FIG. 6 FIG. 2 is a schematic perspective view showing the outline of a magnetic head. 1... Recording/playback core, 2... Erasing core, 2a...
... Erasing gap, 3 ... Non-magnetic material, 5 ... Block body, 7 ... Cut groove, 7a ... Wide portion, 7b ...
Narrow part, 8... Erased core chip.

Claims (1)

[Scope of Claims] 1. An erasing core chip in which two erasing cores are bonded by a non-magnetic material is provided with a kerf consisting of a wide part and a narrow part, and a recording/reproducing core is placed in the wide part and the narrow part of the kerf. A magnetic head, characterized in that an erasing gap is formed between a side surface of the recording/reproducing core located within the wide portion and the erasing core. 2. Providing a groove part by cutting in a part of a block body made of a magnetic material, and filling the groove part with a non-magnetic material, and forming a cut groove consisting of a wide part and a narrow part in the non-magnetic material in the block body. A method for manufacturing a magnetic head, comprising the steps of: providing a magnetic head; cutting the block body to a predetermined thickness to create an erasing core chip; and inserting a recording/reproducing core into the cut groove of the erasing core chip.