JPH03278305A - Magnetic head - Google Patents

Abstract

PURPOSE:To decrease the magnetic fluxes to be withdrawn by an erasing gap so as to prevent crosstalks and to enhance performance and reliability by providing a spacer consisting of a nonmagnetic material or magnetic material having the magnetic permeability lower than the magnetic permeability of a core into the closed magnetic path of an erasing head so as to cross the passing magnetic fluxes. CONSTITUTION:The spacer 11 consisting of the nonmagnetic material 16 and the magnetic material having the magnetic permeability lower than the magnetic permeability of the core is provided in the closed magnetic path of the erasing head, such as the coupling surfaces of the erasing core 5 and a back core 8, the coupling surfaces of the erasing core 5 and a center core 2, in the erasing core 5 or the coupling surfaces of the back core 8 with the erasing core 5 and the coupling surfaces with the center core 2 so as to cross the passing magnetic fluxes. The degrading of the reproducing efficiency of the erasing head by the increased magnetic resistance of the magnetic path of the erasing head and the consequent leaking of the signals reproduced by the erasing head to the recording and reproducing head side are lessened. The magnetic fluxes to be withdrawn by the erasing gap 7 are decreased in this way, by which the crosstalks are prevented and the magnetic head having the high performance and high reliability is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head used in a magnetic disk device, a flexible disk device, and the like.

[Conventional technology]

FIG. 11 is a perspective view showing the configuration of a conventional magnetic head disclosed in, for example, Japanese Patent Laid-Open No. 61-39910.
In the figure, (11 is an approximately T-shaped recording/reproducing core made of a magnetic material such as Mn-Zn ferrite, +21 is a center core made of the same magnetic material as above, and this center core (2) is a core for recording/reproducing. The medium sliding surface (1a) is connected to the core (11) by a non-magnetic bonding material (3) such as glass.
There is a recording/reproducing gap (4) between the recording/reproducing core (1) and the recording/reproducing core (1).
) is formed. (5) is a roughly T-shaped erasing core made of a magnetic material such as Mn-Zn ferrite, and this erasing core (5) is made of a center core (2) and a non-magnetic bonding material (6) such as glass. They are combined to form an erase gap (7) between the medium sliding surface (5a) and the center core (2). (8) is the recording/reproducing core (1) 1 center core (
2) and the bank core for closing the magnetic path of the erasing core (5), (9) is the recording/reproducing coil wound around the leg (1b) of the recording/reproducing core (11), and aΦ is the erasing core ( 5)
This is an erasing coil wound around the leg part (5b) of.

The conventional magnetic head shown in FIG. 11 has a recording/reproducing core (
1), a recording/reproducing head formed by a closed magnetic path consisting of a bank core (8) and a center core (2), and an erasing core (5).
), an erasing head formed by a closed magnetic path consisting of a back core (8) and a center core (2).

Figures 12+a+ and 1) are a plan view and a side view for explaining the flow of magnetic flux during the reproducing process of the magnetic head in Figure 11, where the same reference numerals as in Figure 11 indicate the same parts;
In Fig. 0, whose detailed explanation is omitted, (φm), (
φml), (φ−ri, (φ0.) indicates the magnetic flux of the signal reproduced by the recording/reproducing gap (4), and (φE)
, (φ!I), (φ, ), (φ6.) are the erasure gaps (
7) shows the magnetic flux of the signal reproduced by

Next, the operation of the above conventional magnetic head will be explained.

When reproducing data recorded on a medium (not shown) using a conventional magnetic head, a minute leakage magnetic flux on the medium is drawn in by a recording/reproducing gear (4), and a recording/reproducing core (1), a pack core, etc. (8) and a magnetic flux (φR1) that sends a closed magnetic path consisting of the center core (2).

A closed loop of (φ,) is formed, and a part is the eraser core (5)
The magnetic flux leaks into the magnetic flux (φR3). At this time, the magnetic flux (φ, +1) passing through the recording/reproducing core (1) is guided to the recording/reproducing coil (9), and the reproduced data signal flows to the recording/reproducing coil (9). Also at this time, the erasure gap (7
) tries to play back the data on the media.

If the erase gap (7) is located above the trunk or on the adjacent trunk, the erase gap (7) also draws in minute leakage magnetic flux on the medium, causing the erase core (5) and hack core (8) to
The magnetic flux (φ1
+), (φEX), and a part of the magnetic flux leaks into the recording/reproducing core (1) and becomes magnetic flux (φ13).

[Problem to be solved by the invention]

Since the above-described conventional magnetic head is configured as described above, when reproducing data recorded on a medium, the recording/reproducing core f1. ．． l is the recording/reproducing gap (4)
Both the magnetic flux (φ, 1) drawn in by the erase gap (7) and the magnetic flux (φ, ) drawn in by the erase gap (7) pass through and are guided to the recording/reproducing coil (9). In (9), a signal induced by the magnetic flux (φ1) and (φE3) superimposed flows and reproduction is performed. In this case, the data and erase gear that were originally drawn in by the recording/reproducing gap (4).

Since the data is different from the data pulled in by the erase gear knob (7), the data pulled in by the erase gear knob (7) becomes noise on the reproduction signal from the recording and reproduction coil (9), which may cause errors. This causes a decrease in the margin, and as a result, there is a problem in that the reliability of the reproducing performance of the magnetic head decreases.

This invention was made in order to solve the above-mentioned problems. It reduces the magnetic flux drawn in by the erase ganging, prevents the crosstalk phenomenon where this magnetic flux leaks to the recording/reproducing head side, and achieves high performance and high reliability. The objective is to obtain a magnetic head of

[Means to solve the problem]

The magnetic head according to the present invention is a magnetic head having a structure in which a recording/reproducing head and an erasing head are integrated, and in which a non-magnetic material or the above-mentioned head is constructed so as to cross a passing magnetic flux in a closed magnetic path of the erasing head. A spacer made of a magnetic material with lower magnetic permeability than the core is provided.

[Effect]

The magnetic head according to the present invention has an erasing core made of a magnetic material forming a closed magnetic path of the erasing head, and includes, for example, a coupling surface between an erasing core and a hack core, a coupling surface between an erasing core and a center core, a coupling surface between an erasing core and a center core, an erasing core A non-magnetic material or a magnetic material with a lower magnetic permeability than the above-mentioned core is used to cross the passing magnetic flux in the closed magnetic path of the erasing head, such as between the coupling surface with the erasing core of the hack core and the coupling surface with the center core. By providing a spacer consisting of a magnetic body, the magnetic resistance of the magnetic path of the erase head increases and the reproduction efficiency of the erase head decreases, thereby reducing the leakage of signals reproduced by the erase head to the recording/reproducing head side. can.

[Example] Fig. 1 is a perspective view showing the configuration of a magnetic head which is an embodiment of the present invention, and Fig. 2 (al and (bl) are for explaining the flow of magnetic flux in the reproduction process of the magnetic head shown in Fig. 1. 1j and 12 (al and fb
The same reference numerals as 1 indicate the same parts, and detailed explanation thereof will be omitted. In the figure, Oll is a magnetic material having a lower magnetic permeability than the core provided at the joint between the erasing core (5) and the hack core (8) on the erasing head side, such as M n -Z.
The spacer is made of n-ferrite or the like, which has a magnetic permeability about one order of magnitude lower than that of the core, or a non-magnetic material such as glass.

Here, when forming the spacer O1l, it may be formed by sputtering, for example, by sandwiching a thin plate-like member, or by using adhesive, for example, at the joint between the erasing core (5) and the bank core (8). The spacer 0υ is formed by various methods, such as using a member mixed into the spacer.

Next, the operation of the magnetic head according to the embodiment of the invention described above will be explained. In the magnetic head according to this invention,
As shown in Figure 1, the erasing core (5), center core (2)
) and the bank core (8), in particular the erasing core (5), center core (2) and hack core ( Since there is a configuration in which a spacer 0Il made of a magnetic or non-magnetic material with lower magnetic permeability is provided compared to 8), the magnetic resistance of the closed magnetic path of the erase head increases and the reproduction efficiency at the erase gear knob (7) decreases. do. Therefore, the magnetic flux (φ1+) flowing through the erasing core (5) by 111M decreases, and the magnetic flux (φ.) naturally leaking into the recording/reproducing head side decreases accordingly.

It should be noted that during the erasing operation, by increasing the erasing current, an erasing effect similar to that of the conventional magnetic head can be obtained.

3 to 10 are perspective views showing the structure of a magnetic head according to another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts, and detailed explanation thereof will be omitted.

In the magnetic head according to the embodiment shown in FIG. 1, the recording/reproducing core f1. ), a center core (2), an erasing core (5), and a back core (8) combined to form a recording/reproducing head and an erasing head in an integrated structure. The embodiment shown in the figure is a magnetic head having a separate structure in which a spacer 02) made of non-magnetic material such as glass is provided approximately in the center of the hack core (8). In order to separate the read head and erase head, a center spacer made of non-magnetic material such as glass is installed approximately in the center of the center core (2).
The magnetic head has a flat-shaped configuration with a mouth, and in the embodiment shown in FIG.
This is a magnetic head having a separate structure in which center spacers OQ and a center spacer OQ shown in the figure are provided.

In addition, in the embodiment shown in FIG. 6, the recording/reproducing core (1)
The closed magnetic path of the recording/reproducing head is formed by the recording/reproducing core (1) and the center core (2) without providing a hack core (8) that connects the center core (2) and the erasing core (5). The closed magnetic path of the head is composed of an erasing core (5) and a center core (2), and in this magnetic head, a magnetic material with a lower X3 magnetic coefficient than the core as shown in FIG. A spacer 0υ made of a magnetic material is provided at the joint between the erasing core (5) and the center core (2).

In addition, in the magnetic head of each of the above embodiments, the erasing gear knob (7) of the erasing gear knob (7) of the erasing gear knob (7) is shown as the magnetic gear knob (7) of the advance erasing type, but in the embodiment shown in FIG.
This is a magnetic head in which the erase gap (7) has a tunnel erase type configuration.

Furthermore, in the magnetic heads of each of the above embodiments, the erasing core (5
) and the back core (8), or the erasing core (5) and the center core (2), a spacer 0υ made of a magnetic or non-magnetic material having a lower magnetic permeability than the core is provided. The example shown in FIG. 8 is a magnetic head having a configuration in which a spacer θB is provided within the bank core (8) itself, and the example shown in FIG. This magnetic head has a structure in which a spacer 0υ is provided within the magnetic core (5) itself.

In addition, in the magnetic head of each of the above embodiments, by interposing a spacer Qll made of a magnetic material or a non-magnetic material with a lower i3 magnetic coefficient than the core in the closed magnetic path on the erasing head side, the magnetic resistance of the closed magnetic path on the erasing head side is increased. 10 is shown for a magnetic head configured such that the magnetic resistance is larger than the magnetic resistance of the closed magnetic path on the recording/reproducing head side. However, in the embodiment shown in FIG. 10, the hack core (8
) consists of a back core (8W) on the recording/reproducing head side and a back core (8E) on the erasing head side.
This is a magnetic head that is made of a magnetic material with lower magnetic permeability than other magnetic heads, and has the same effect as a spacer.

The magnetic heads of the embodiments shown in FIGS. 3 to 10 have the same effects as the magnetic head of the embodiment shown in FIG. 1.

The magnetic permeability of the magnetic material used as the spacer should be low enough to make the magnetic resistance of the closed magnetic path on the erasing head side larger than the magnetic resistance of the closed magnetic path on the recording/reproducing side and to reduce the magnetic flux drawn by the erasing gap. It is sufficiently effective if it is about one order of magnitude lower than the magnetic permeability.

〔Effect of the invention〕

As described above, according to the magnetic head of the present invention, in a magnetic head having a structure in which a recording/reproducing head and an erasing head are integrated, non-magnetic material or i from the core that makes up the head
A spacer made of a magnetic material with a low IM rate is provided, which reduces the magnetic flux drawn in by the erase gear knob and prevents the crosstalk phenomenon in which this magnetic flux leaks into the recording/reproducing head side, resulting in high performance and high reliability magnetic field. This has an excellent effect in that a head can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a magnetic head according to an embodiment of the present invention, and FIG. 3 to 10 are perspective views showing the structure of a magnetic head according to other embodiments of the present invention, FIG. 11 is a perspective view showing the structure of a conventional magnetic head, and FIG. 12+a
+ and (bl are a plan view and a side view for explaining the flow of magnetic flux in the reproducing process of the magnetic head of FIG. 11. In the figure, 1... recording/reproducing core, 2... center core, 3 , 6... Non-magnetic material combination, 4... Recording/reproducing gear, 5... Erasing core, 7... Erasing gear knob, 8... Back core, 8E... Erasing head side back core (Spacer) 9... Recording/reproducing coil, 10
. . . Erasing coil, 11 . . . Spacer. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a magnetic head having a structure in which a recording/reproducing head and an erasing head are integrated, a magnetic material made of a non-magnetic material or a magnetic material having a lower magnetic permeability than the core constituting the head so as to cross the magnetic flux passing through the closed magnetic path of the erasing head. A magnetic head characterized by being provided with a spacer.