JPS59124015A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the coercive force of a magnetic head by providing a shield core adjacently to an erasing core. CONSTITUTION:The shield core 4 is provided adjacently to the erasing core 1. When an external magnetic field is applied, the major part of it flows into the shield core 6 and magnetic flux flowing in the erasing core 1 is reduced greatly. The magnetic flux flowing in the shield core 6 flows directly to the erasing core 2 from a back core 3 partially, and the remainder flows to the erasing core 2 through the shield gap 7, erasing core 1, and an erasing gap 4. The magnetic path of the latter, however, has magnetic resistance far larger than that of the latter and the majority of the magnetic flux flowing in the core 6 flows through the erasing core 2. Consequently, the magnetic flux flowing through the gap 4 is reduced and a magnetic field established at the circumference is also reduced. Thus, the coercive force of the magnetic head is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic jacket for a magnetic head.

An example of the structure of a conventional magnetic head is shown in FIG.

1.2 is an erase core, 3 is a back core, 4 is an erase gap, 5 is a recording/reproducing core, and 6 is an erase coil. Current position
As storage devices tend to be smaller, magnetic field sources inside and outside the device are brought closer to the magnetic head, making it easier for external magnetic fields to be applied to the magnetic head.

Back core 3' (does not have Il'') [has] Qi head,
When a magnetic field is applied in the direction of the arrow shown in FIG. Since the erase gap 4 has a smaller cross-sectional area than the erase core 1.2, magnetic flux concentrates in this portion, and a B field ffxA is generated around the erase gap 4.

Magnetic head in this condition? When the recording medium is moved by φ11, due to the high magnetic field around the erase gap 4,
The recording medium was magnetically damaged and the information written on it was destroyed. Also, a current is passed through the erasing coil 6,
During erasing I'11', part of the magnetic path becomes non-magnetic, so the current value for obtaining a predetermined erasing field becomes large.

Next, back core 52ft: In the waiting magnetic head, when the same magnetic field as in the front row is applied, erase core 1 [The inflowing magnetic flux flows through back core 6 and erase gap 4 at a rate of 9, so it passes through erase gap 4. Although the magnetic flux is smaller than when there is no bank core, the magnetic resistance of the part where the bank core 5 and back core 3 are in contact with the erase core 1.2 is not sufficiently smaller than the magnetic resistance of the erase core 4. A pot magnetic field is generated around the erase gap 4, and similarly destroys a large amount of recorded information.

The present invention aims to solve these problems.

A shielding core is provided adjacent to the erase core, and its purpose is to completely improve the magnetic resistance of the head by 100 dB.

Below, drawing f (therefore, detailed explanation will be given).

FIG. 2 shows an embodiment of the present invention. 1,2V 55j
7.3 is the back core, 4 is the eraser, 5 is the recording/reproducing core, 6 is the fast core, 7 is the fast gear, 8
is the cancellation coil.

In FIG. 2, when an external magnetic field is applied in the direction of the arrow in the figure, the magnetic flux around the thin core 6 changes to the thin core 6.
If there is no 52, the magnetic flux flows into the erase core 1, but if there is a -shi or hei core 6, the magnetic flux from the hei core AVc flows in, and the magnetic flux flowing into the erasure core 1 becomes the fX series. Decrease. The magnetic flux that has flowed into the blank core 6 is divided into two parts: one that flows directly from the bank core 3 to the erase core 2, and the other that flows through the blank gap, the erase core 1° and the erase gap 4 to the erase core 2. I'll share it. However, since the latter path includes two non-magnetic materials, the magnetic gap 7 and the erase gap 40, the magnetic resistance is not sufficiently reduced compared to the former magnetic path. ηε人しfe (
Most of the 1411 bundles are sent to erased core 2 via all back cores 3.
flows to Therefore, the magnetic flux passing through the erase gap 4 decreases, and the magnetic field generated around the erase gap 4 also decreases.As a result, even if the magnetic head moves, there is no risk of destroying all the information that has already been written. This decreases the magnetic head's magnetic resistance.

Next, when an electric current is applied to the erase coil to perform an erase operation, the magnetic path starts from erase core 1, passes through Shiyahei gap 7, back core 3, erase core 2, and then from erase gap 4. The path back to the erased core, from erased core 1 to Shiyahei gap 7, back core 5, L'? After going through the "Ico" arrow, a path is created that passes through the entire space between the shy core 6 and the erase core 10 and returns to the erase core 1, but in the latter route, the space between the strong core 6 and the erase core 1 is made of non-magnetic material. Since the distance between the two is also sufficiently larger than the distance between the erase gaps 4, the magnetic resistance is sufficiently large compared to the former aFMK, and most of the magnetic flux passes through the former's warp w1. Therefore, in the erasing operation, the C, H, and H cores 6 are hardly affected, and can perform operations similar to the conventional 1eI3 type. Furthermore, since the magnetic resistance of the magnetic path is considerably lower than that of the case where the core is 5° and there is no core 6, the erase current force is reduced.

As described above, adjacent to the erased core 1, the quiet core 4
By providing this, it is possible to reduce the magnetic field around the erase gap 5 due to the magnetic field flowing in from the outside without affecting the erase operation, and the magnetic resistance of the magnetic head can be completely improved.

Furthermore, the erase current also decreases. Therefore, the magnetic arrangement around the magnetic head of the magnetic storage device is facilitated.

[Brief explanation of the drawing]

FIG. 1 shows an example of a conventional magnetic head.
FIG. 2 shows an embodiment of the magnetic throat according to the present invention. 1.2・・・・・・C death core 5・・・・・・Back core 4・・・・・・ζDepression Gatsfu” 5・・・・・・Recording/playback core 6・・・・・・Shahei Core 7...L-?Hei Gap 8...Erase Koilz Upper Applicant Mashishiki Kaishi Suwa Silk Industry Agent Benkoji Mogami Yang Figure 1 Figure 2

Claims (1)

[Claims] An elegant head characterized by having a thin core adjacent to an erased core.