JPH0296906A - Magnetic head device - Google Patents

Abstract

PURPOSE:To suppress a magnetic effect due to a back gap, and to improve a read/write characteristic by providing a back core member so as to close a magnetic circuit by means of the back gap between a read/write core and an erasing core. CONSTITUTION:On a read/write core 11, a back gap 15 is formed at the coupling part of core members 11a and 11b on the reverse side to a read/write gap 10. In addition, the gap 15 is formed at the coupling part of core members 13a and 13b on an erasing core 13. Further, in a condition to be coupled to the gap 15 side of the cores 11 and 13 and to close a magnetic circuit by means of the gap 15, a back core member 16 is provided. Consequently, the magnetic circuit by means of the gap 15 is closed by the member 16, and the generation of a leakage flux from the gap 15 is suppressed. Thus, the magnetic effect on the read/write gap is suppressed, and the read/write characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic head device used, for example, in a floppy disk device for high-density recording.

(Prior Art) Conventionally, for example, a floppy disk device uses, for example, a bulk type magnetic head device in which a read/write gap and an erase gap are formed. Such a magnetic head device has a structure in which a read/write core in which a read/write core is formed and an erase core in which an erase gap is formed are coupled via, for example, a glass member.

As shown in FIG. 2, the magnetic head device 2o generates a recording magnetic field on the magnetic recording medium 21 from the read/write gap using a current flowing in according to the write data from the read/write circuit 22, and writes data. Record magnetically. The magnetic head device 20 also extracts magnetic flux of recorded data from the magnetic recording medium 21 and outputs the read signal to the read/write circuit 22 .

The read/write circuit 22 reproduces read data according to the read signal from the magnetic head 20. Here, the erase gap is provided to erase (DC erase) data recorded on the magnetic recording medium.

This ensures compatibility between magnetic recording media in the floppy disk device.

Incidentally, each of the read/write and erase gaps is formed by a structure in which core members constituting each core are laminated together. Therefore, in each core, a gap called a back gap is formed on the opposite side of each core corresponding to each gap. This back gap forms a so-called magnetic circuit, and causes phenomena such as leakage magnetic flux or extraction of magnetic flux from the magnetic recording medium during read/write operations due to the original read/write gap.

(Problems to be Solved by the Invention) Conventional bulk-type magnetic head devices used in floppy disk devices, for example, have a structure in which read/write is difficult.
A back gap is formed on the opposite side of each of the write gap and erase gap. This back gap causes effects depending on the magnetic circuit, such as generation of leakage magnetic flux or extraction of magnetic flux from the magnetic recording medium, during read/write operations. Therefore, during read/write operation due to the read/write gap, the playback output level decreases.
There are disadvantages of magnetic adverse effects such as asymmetrical phenomena in readout waveforms and erase crosstalk.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head device that can suppress the negative magnetic effects caused by the back gap formed due to the structure of the core and eliminate the read/write characteristics caused by the read/write gap.

[Structure of the Invention (Means and Effects for Solving the Problems) The present invention provides a magnetic head device comprising a read/write core having a read/write gap and an erase core having an erase gap. This device is equipped with a back core part that is connected to the vicinity of the back gap and is provided so as to close the magnetic circuit created by the back gap.

With such a configuration, it is possible to suppress the negative magnetic influence due to the back gap formed due to the structure and improve the read/write characteristics such as increasing the magnetic efficiency in read/write operations.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing the structure of a magnetic head device of, for example, a leading wide erase type used in, for example, a floppy disk device for high-density recording. As shown in FIG. 1, the magnetic head device of the same embodiment includes a read/write core 11 having a read/write gap 10 and an erase core 13 having an erase gap 12. The read/write core 11 has a first core part 11a and a second core part 4All.
b are bonded to each other by, for example, an adhesive or the like. Similarly, the erase core 13 is formed by bonding a first core portion 4113a and a second core portion 44131+, for example, with an adhesive or the like. Each core It, 13 is connected to a respective first core member 11a, 13a via a glass member 14. The glass member 14 is a separator for separating the magnetic circuits formed in the read/write core 11 and the erase core 13.

In the read/write core 11, a back gap 15 is formed at a position opposite to the read/write gap 10 at the junction of the first and second core members 11a and 11b. Similarly, a back gap 15 is formed in the erase core 13 at a position opposite to the erase gap 12 at the joining portion of each of the first and second core members 13a and 13b. In the same embodiment, each core 11. A back core member 16 is provided in such a manner as to be coupled to the back gap 15 side of each back gap 13 to close the magnetic circuit formed by each back gap 15. This back core member 1G is made of, for example, ferrite material similar to each core 11.13, and is
is combined with

With such a structure, the magnetic circuit by the back gap 15 that is inevitably formed is connected to the bank core member 16.
This results in a closed state, and it is possible to prevent leakage magnetic flux from occurring from the back gap I5. Therefore, when a data recording operation is performed on a magnetic recording medium through the read/write gap l opening, the magnetic flux leaking from the back gap 15 exerts a magnetic influence on the read/write gap 10, causing recorded data. It is possible to suppress phenomena such as an increase in waveform asymmetry. Further, it is possible to prevent a situation in which the magnetic resistance of the magnetic circuit made up of the read/write gap 10 increases due to the back gap 15 and the level of the reproduction output decreases during data reproduction. Furthermore, when reproducing data, it is possible to prevent a situation in which erase crosstalk, in which the reproduction operation using the erase gap 12 affects the read/write gap 10, is increased due to the back gap 15.

In the above embodiment, the back core member 1G is commonly connected to each of the read/write core 11 and the erase core 13, but the present invention is not limited to this. A configuration in which a back core member is provided may also be used.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to suppress the negative magnetic effects due to the back gap formed in the structure, for example, in a magnetic head device used in a floppy disk device for high-density recording. Can be done. Therefore, during read/write operations on a magnetic recording medium, it is possible to prevent adverse effects caused by leakage magnetic flux due to the back gap during data recording or data reproduction, and to improve read/write characteristics. be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a magnetic head device according to an embodiment of the present invention, and FIG. 2 is a block diagram for explaining the operation of a conventional magnetic head device. IO...read/write gap, 1■...read/write core, 12...erase gap, 13...
・Erase core, 15...Back gap, 16...
・Back core material. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A read/write core having a read/write gap, an erase core coupled to the read/write core and having an erase gap, and a back gap coupled to the vicinity of each back gap formed in the read/write core and the erase core. and a back core member provided to close a magnetic circuit.