JPH033107A - Magnetic head device for data recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of an S/N without lowering a read/write efficiency and an erase efficiency by forming a non-magnetic separator part in which a non-contact surface opposed to a contact surface is wider than the contact surface with a recording medium between a read/write core and an erase core. CONSTITUTION:A trapezoidal separator 20 made of a non-magnetic substance is provided between a read/write core 11 and an erase core 12 through cores 14 and 15. Since the separator 20 is in the trapezoida shape in which a thickness (b) of a non-contact surface 21b is made wider than a thickness (a) of a contact surface 21a of the recording medium, the separator 20 can be made thick without narrowing the areas of the cores 14 and 15 when the size of the whole magnetic head is restricted. Consequently, without lowering the read/write efficiency and erase efficiency, the deterioration of the S/N due to a crosstalk can be prevented, and a magnetic recording can be surely executed.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to the structure of a magnetic head used, for example, in a floppy disk device, and particularly to a magnetic head device for a data recording/reproducing device having a separator feature. Regarding.

(Prior Art) In a data recording/reproducing device, for example, a floppy disk device, a magnetic head having a read/write core, an erase core, and a separator made of a non-magnetic material is used. Here, the structure of the conventional magnetic head is
As shown in FIG.

FIGS. 4 and 5 are a side view and a plan view, respectively, showing the structure of a conventional magnetic head. The magnetic head has a read/write core 11. It consists of an erase core 12 and a separator 13. Note that arrow A in the figure indicates the running direction of a recording medium (disc) not shown.

Here, the separator 13 is provided between the core 14 on the read/write core 11 side and the core 15 on the erase core 12 side.
It consists of a non-magnetic material of similar thickness bonded by an organic/inorganic adhesive. This separator 13 is for magnetically separating the read/write core 11 and the erase core 12, and prevents the magnetic flux generated in the read/write core 11 from leaking to the erase core 12 side. It functions to prevent the magnetic flux generated in the read/write core 11 from leaking to the read/write core 11 side.

In the magnetic head constructed in this manner, by forming the separator 13 thickly, the amount of leakage magnetic flux generated between the read/write core 11 and the erase core 12 can be significantly reduced. Particularly during reading, crosstalk caused by the erase gap 17 and separator 13 may be superimposed on the reproduced signal generated by the read/write gap 1G, so by making the separator 13 thicker, the S/N ratio due to this crosstalk can be deterioration can be prevented.

However, if the separator 13 is made too thick, there are restrictions on the overall size of the magnetic head.
The area of 5 becomes narrower. That is, as shown in FIG. 4, the separator 13 has a thickness of 81 on the contact surface of the recording medium and a thickness of b on the non-contact surface facing the contact surface.
Conventionally, the core 14.15 has a constant thickness of a-b, so if the thickness is increased, the core 14.15 becomes narrower if there is a restriction on the overall size of the magnetic head. core 14.1
5 becomes narrower, the magnetic resistance increases and it becomes difficult for magnetic flux to pass through the core, causing a decrease in read/write efficiency and erase efficiency, such as insufficient reproduction output and insufficient erasing. become.

On the other hand, when the separator 13 is formed thinly, the core 1
Since the area of 4.15 is expanded, read/write efficiency and erase efficiency are improved. However, separator 13
If the separator 13 is made thinner, magnetic flux leakage between the cores 14 and 15 is likely to occur throughout the separator 13, and crosstalk increases, resulting in increased deterioration of the S/N ratio.

As described above, the thickness of the separator 13 needs to be set to an optimum thickness according to the overall size of the magnetic head, in view of the balance between read/write efficiency, erase efficiency, and deterioration of the S/N ratio due to crosstalk. However, when trying to increase the linear density through high-density recording, the spacing between the read/write gap 1B and the erase gap 17 becomes narrower, so the influence of the separator thickness (a, b) only increases, and the read/write efficiency and It becomes difficult to set the separator thickness so that erase efficiency and S/N ratio due to crosstalk are all in a good state.

(Problems to be Solved by the Invention) As mentioned above, in the conventional magnetic head structure, when the separator becomes thicker, read/write efficiency and erase efficiency decrease, and conversely, when the separator becomes thinner, the amount of leakage magnetic flux increases. , which caused deterioration of the S/N ratio due to crosstalk (there was a problem).

The present invention was made in view of the above points, and is an object of the present invention to prevent deterioration of the S/N ratio due to crosstalk and to perform magnetic recording reliably without reducing read/write efficiency or erase efficiency. An object of the present invention is to provide a magnetic head device for a data recording/reproducing device that can perform the following steps.

[Structure of the Invention] (Means for Solving the Problems) That is, in the magnetic head device of the data recording/reproducing device according to the present invention, there is provided a magnetic head between the read/write core and the erase core. A separator portion, which is a non-magnetic portion, is formed by widening the non-contact surface facing the contact surface.

(Function) In the head structure described above, a trapezoidal separator part is formed in which the non-contact surface of the recording medium is wider than the contact surface of the recording medium, so when there is a restriction on the overall size of the magnetic head, the core area The separator section can be expanded without narrowing the area.

Therefore, deterioration of the S/N ratio due to crosstalk can be prevented without reducing read/write efficiency or erase efficiency.

(Embodiment) Hereinafter, a magnetic head device of a data recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

1 to 3 are diagrams showing the structure of the magnetic head of the present invention, and are a perspective view, a side view, and a plan view, respectively.

A separator 20 made of a non-magnetic material is provided between the read/write core 11 and the erase core 12 via the cores 14 and 15. The separator 20 magnetically separates the read/write core 11 and the erase core 12, and is formed in a trapezoidal shape here, and has a contact surface 21a with a recording medium (disc) not shown, and a contact surface 21a with a recording medium (disk) not shown. It has a non-contact surface 21b opposite to the surface 21a.

Here, the contact surface 2 of the separator 20 with the recording medium
If the thickness of 1a is a, and the thickness of non-contact surface 21b is b,
The thickness b of the non-contact surface 21b is larger than the thickness a of the contact surface 21a.

By the way, in a magnetic head having such a configuration, during reading, crosstalk caused by the erase gap 17 and the separator 13 (see FIG. 4, which shows a conventional structure) affects the reproduced signal generated by the read/write gap 16. It is known that these signals overlap and cause deterioration of the S/N ratio.

In the magnetic head of the present invention, the trapezoidal separator 20 is formed in which the thickness b of the non-contact surface 21b is wider than the thickness a of the contact surface 21a, so that when there is a restriction on the overall size of the magnetic head, , the separator 20 can be made thicker without reducing the area of the cores 14 and 15.

Therefore, the separator 20 reduces the leakage magnetic flux generated between the read/write core 11 and the erase core 12 without reducing read/write efficiency or erase efficiency (these efficiencies decrease as the area of the core 14, 15 becomes narrower). The amount can be significantly reduced. In particular, S due to loss talk as mentioned above, which is a problem when reading.
/N ratio can be prevented from deteriorating.

Further, when using a magnetic head of the advanced wide erase method for low density recording, for example, it is necessary to increase the erase current. Even in such a case, it is possible to suppress an increase in the asymmetric component of the reproduction signal due to leakage of the erase magnetic flux, and reliable magnetic recording and reproduction can be performed.

Note that the separator 13 may be a space, except for structural problems, and even in this case, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, the separator structure allows
Since the separator can be formed thick without reducing the core area, magnetic recording can be performed reliably by preventing deterioration of the S/N ratio due to crosstalk without reducing read/write efficiency or erase efficiency. It is something that can be done.

[Brief explanation of drawings]

1 to 3 are diagrams showing the structure of a magnetic head according to an embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. 5 are diagrams showing the structure of a conventional magnetic head, with FIG. 4 being a side view and FIG. 5 being a plan view. DESCRIPTION OF SYMBOLS 11... Read/write core, 12... Erase core, 20... Separator, 21a... Contact surface, 21
b...Non-contact surface, 14.15...Core, 16...
Read/write gap, 17... erase gap.

Claims (1)

[Claims] A magnetic head device having a separator section, which is a non-magnetic section, between a read/write core and an erase core, wherein the separator section faces the contact surface rather than the contact surface with the recording medium. A magnetic head device for a data recording/reproducing device, characterized in that a non-contact surface is formed widely.