JPH04195708A - Magnetic head - Google Patents

Abstract

PURPOSE:To avoid a playback error caused by disagreement between the width of a magnetic recording part and the width of a record/playback magnetic gap by a method wherein a main magnetic core having a magnetic gap perpendicular to a scanning direction and auxiliary magnetic cores having magnetic gaps parallel with the main magnetic gap on one or both sides of the main magnetic core are provided. CONSTITUTION:A magnetic head is composed of a main record/playback magnetic core 1, two auxiliary record/playback magnetic cores 2, two main erasing magnetic sores 5 and two auxiliary erasing magnetic cores 6. A main record/playback magnetic gap 3 and auxiliary record/playback magnetic gaps 4 are formed along a direction perpendicular to a scanning direction between a spacer and the main record/playback magnetic sore 1 and the auxiliary record/playback magnetic cores 2 respectively. On the opposite side, the approximately L-shaped main and auxiliary erasing magnetic cores 5 and 6 are provided. The operations of the record/playback magnetic cores 1 and 2 and the erasing magnetic cores 5 and 6 are switched by a control means which judges the recording width of a former magnetic recording part 9 automatically. With this constitution, a playback error caused by disagreement between the width of the magnetic recording part and the width of the record/playback magnetic gap of the magnetic head can be avoided.

Description

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

[Prior art 1] Conventionally, this type of magnetic head has a recording/reproducing magnetic core 11 formed in an abbreviated shape as shown in FIG. 4, and a predetermined gap length between the recording/reproducing magnetic core 11 and a spacer 17. The magnetic recording/reproducing gap 12 has a magnetic recording/reproducing gap 12.

The magnetic head shown in FIG. 5 is composed of a recording/reproducing magnetic core 11 shown in FIG. 4 and two erasing magnetic cores 13.

The recording/reproducing magnetic core 11 and the erasing magnetic core 13 are formed in an abbreviated shape, and the two erasing magnetic cores 13 are arranged facing each other outside the recording/reproducing magnetic core 11 with a spacer 17 in between. There is.

A recording/reproducing magnetic gap 12 is formed between the spacer 17 and the recording/reproducing magnetic core 11, and the two erasing magnetic cores 1
3, an erase magnetic gap 14 is formed between the two.

If the width of the recording/reproducing magnetic gap 12 is A, and the sum of the widths of the two erasing magnetic gaps 14 is B (the gap length of one erasing magnetic gap 13 is 1/2B), then FIG. The width recorded on the magnetic recording medium by the magnetic head shown in FIG. 1 is A+B.

When this magnetic head scans the magnetic recording medium in the direction of arrow 16 shown in FIG. 6, the width of recording (including erasing) on the magnetic recording medium is A+B.

[Problems to be Solved by the Invention] However, the old magnetic recording section 9 was recorded with a width C as shown in FIG. 6 by magnetic heads having different gap lengths on the recording medium scanned by the magnetic head. In this case, even if new recording is performed on the old magnetic recording section 9 using the magnetic head shown in FIG. 5, the old magnetic recording section 9 will remain with a width of C-(A+B). Therefore, when reproducing data using this magnetic head, there is a drawback that reproduction errors occur due to the inclusion of undesired reproduced signal components. Similar deficiencies exist even when the conventional magnetic head shown in FIG. 4 is used.

Next, the magnetic recording medium in which the old magnetic recording section 9 remains as shown in FIG. 7 is reproduced by a magnetic head having a recording/reproducing magnetic gap 12 having a gap length C larger than that of the magnetic head in FIG. 5. If this is done, the old magnetic recording section 9 and
Since the new magnetic recording section 10 is to be reproduced at the same time, there is a drawback that reproduction errors may occur due to the inclusion of undesired reproduction signal components. Furthermore, if the distance between adjacent magnetic recording sections is smaller than the width A of the recording/reproducing magnetic gap 12,
Adjacent magnetic recording sections are read at the same time, which also has the disadvantage of causing playback errors.

As described above, the conventional magnetic head has the disadvantage that if the width of the magnetic recording section and the width of the recording/reproducing magnetic gap 12 do not match, there is no compatibility in recording or reproduction.

[Means for Solving the Problems] A magnetic head of the present invention includes a main magnetic core in which a magnetic gap is formed perpendicular to the scanning direction, and a magnetic gap parallel to the magnetic gap on one or both sides of the main magnetic core. A sub-magnetic core is formed.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIGS. 2 and 3 are views showing an example of the scanning state of FIG. 1.

Note that components having the same configuration and functions as conventional magnetic heads will be described using the same reference numerals.

The magnetic head shown in FIG. 1 includes a main recording/reproducing magnetic core 1,
It is composed of two sub-recording/reproducing magnetic cores 2, two main erasing magnetic cores 5, and two sub-erasing magnetic cores 6.

Both the main recording/reproducing magnetic core 1 and the auxiliary recording/reproducing magnetic core 2 are formed in an abbreviated shape, and the auxiliary recording/reproducing magnetic core 2 is arranged on both sides of the main recording/reproducing magnetic core 1 in parallel to the scanning direction. . A main recording/reproducing magnetic gap 3 and a sub-recording/reproducing magnetic gap 4 are formed between the main recording/reproducing magnetic core 1 and the auxiliary recording/reproducing magnetic core 2 and the spacer 17 in a direction perpendicular to the scanning direction. On the opposite side of these recording/reproducing magnetic cores 1 and 2, a main erasing magnetic core 5 and a sub-erasing magnetic core 6 are formed in an abbreviated shape with a spacer 17 interposed therebetween.
is located. As shown in FIG. 2, the main erasing magnetic core 5 is arranged parallel to the scanning direction 16 outside the new magnetic recording area 1o recorded by the main recording/reproducing magnetic core 1, and the sub erasing magnetic core 6 is arranged parallel to the scanning direction 16. The sub recording/reproducing magnetic core 2
It is arranged parallel to the scanning direction 16 on the outside. A main erase magnetic gap 7 and a sub erase magnetic gap 8 are formed in a direction perpendicular to the scanning direction 16 between the main erase magnetic core 5 and the sub erase magnetic core 6 and the spacer 17, respectively. The operation of the recording/reproducing magnetic cores 1 and 2 and the erasing magnetic cores 5 and 6 is switched by automatically determining the recording width of the old magnetic recording section 9 by a control means (not shown). .

The operation of this embodiment having the above configuration will be explained using the drawings.

First, when recording or reproducing the old magnetic recording section 9 recorded with a width matching the width of the main magnetic gap 3 formed in the main recording/reproducing magnetic core 1 as shown in FIG. The reproducing magnetic core 1 and the main erasing magnetic core 5 are activated to be in use, and the sub recording/reproducing magnetic core 2 and the sub erasing magnetic core 6 are activated.
Recording or reproduction is performed on the magnetic recording medium while the magnetic recording medium is in an unused state.

On the other hand, as shown in FIG. If the old magnetic recording section 9 is recorded with a width that matches the width of the main recording/reproducing magnetic core 1.
Then, the sub recording/reproducing magnetic core 2 and the sub erasing magnetic core 6 are operated to be in a use state, and the main erasing magnetic core 5 is in an inconvenient state to perform recording or reproduction on a magnetic recording medium. Further, at this time, the main recording/reproducing magnetic core 1 may be linked with the sub-erasing magnetic core 6.

In this embodiment, the operations of the recording/reproducing magnetic cores 1 and 2 and the erasing magnetic cores 5 and 6 are automatically switched, but they may also be switched manually based on information from the magnetic recording medium.

[Effects of the Invention] As explained above, according to the present invention, it is possible to change the recording or reproducing width on a magnetic recording medium,
There is no possibility of reproduction errors due to mismatch between the width of the magnetic recording section and the width of the recording/reproducing magnetic gap of the magnetic head, thereby maintaining compatibility in recording or reproducing the magnetic recording medium.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention, FIGS. 2 and 3 are views showing the scanning state of FIG. 1, and FIGS. 4 and 5 are perspective views showing a conventional magnetic head. , Figures 6 and 7
The figure shows the scanning state of a conventional magnetic head. DESCRIPTION OF SYMBOLS 1... Main recording/reproducing magnetic core, 2... Sub-recording/reproducing magnetic core, 3... Main recording/reproducing magnetic gap, 4... Sub-recording/reproducing magnetic gap, 5... Main erasing magnetic core, 6・・・
・Sub erase magnetic core, 7... Main erase magnetic gap, 8・
...Sub erasure magnetic gap, 9...Old magnetic recording section, 1o
... New magnetic recording section, 11 ... Recording and reproducing magnetic core, 1
2... Recording/reproducing magnetic gap, 13... Erasing magnetic core, 14... Erasing magnetic gap, 15... Erased magnetic recording section, 16... Scanning direction of magnetic head, 17
···Spacer.

Claims (1)

[Claims] It is characterized by comprising a main magnetic core in which a magnetic gap is formed perpendicular to the scanning direction, and a sub magnetic core in which a magnetic gap parallel to the magnetic gap is formed on one or both sides of the main magnetic core. magnetic head.