Magnetic head having cut-out portions for different...

Details Magnetic head having cut-out portions for different... Magnetic head having cut-out portions for different...

2001-05-04

2002-06-11

Klimowicz, William (Department: 2652)

Dynamic magnetic information storage or retrieval

Fluid bearing head support

Disk record

C360S235000

Reexamination Certificate

active

06404591

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic head for a magnetic disc and a method for manufacturing the same and, in particular, to a magnetic head for a magnetic disc, in which a plurality of head cores having different recording densities are disposed adjacent to one another, and a method for manufacturing the same.
2. Related Art
As a conventional magnetic head for a magnetic disc, for example, there is known a magnetic head having such a structure as shown in
FIGS. 9 and 10
. The present conventional magnetic head includes a head core
1
a,
which is mounted on a head arm (not shown) of a magnetic disc device and can be slidingly contacted with the recording surface of a magnetic disc for magnetic recording and reproduction, and a head core
1
A for erasing the magnetic records of a magnetic disc in order to restrict the width of a track.
In the head cores
1
a
and
1
A, there are formed gaps G
1
and G
2
respectively. In such a manner that the head cores
1
a
and
1
A are held by and between a wear resistant slider
2
A and a wear resistant slider with a groove
3
A both of which can be slidingly contacted with the recording surface of the magnetic disc, these head cores
1
a
and
1
A are retained by a ferrite ring
4
A which shields against the external magnetism.
That is, an erasing coil
5
A for erasing the magnetic records of the magnetic disc is fitted into the interior portion of the erasing head core
1
A, while a recording and reproducing coil
6
A for recording and reproducing the recording information of the magnetic disc is fitted into the interior portion of the recording and reproducing head core
1
a.
Also, a back core
7
A for forming a magnetic path is disposed in contact with the lower portions of the head cores
1
a
and
1
A.
Now, in a personal computer or the like which incorporates a magnetic disc device therein, there is required a magnetic disc device which not only is capable of mounting therein a magnetic disc having a storage capacity of 1 MB or 2 MB recordable and reproducible by a magnetic head including the above-mentioned head cores
1
a
and
1
A but also is capable of mounting therein a magnetic disc having a storage capacity of 100 MB in compliance with a request for an increase in the storage capacity. For such high-density recording magnetic disc device, it is also desired that a conventionally used magnetic disc having a storage capacity of 1 MB or 2 MB can also be used therein.
However, under the present conditions, the above-mentioned high-density recording magnetic head is manufactured as an entirely different structure from the magnetic head having a storage capacity of 1 MB or 2 MB. That is, the magnetic disc having a storage capacity of 1 MB or 2 MB and the magnetic disc having a storage capacity of 100 MB, which are not different in outer appearance, cannot be magnetically recorded or reproduced by the same magnetic head.
In view of the above, there has been proceeding the development of a magnetic head which is structured such that it has not only a normal recording head core for a storage capacity of 1 MB or 2 MB but also a high-density recording head core for a storage capacity of 100 MB. However, when the normal recording head core for a storage capacity of 1 MB or 2 MB and the high-density recording head core for a storage capacity of 100 MB are simply united together, not only the above-mentioned head cores
1
a
and
1
A are held by and between the sliders
2
A and
3
A and the back core
7
A is fixed to the head cores
1
a
and
1
A, but also the high-density recording head core is mounted on the slider
2
A or
3
A.
In this case, although the normal head core and high-density head core can be united together, the number of parts of such structure is large, which accordingly increases the time and labor of a process for assembling the parts of the magnetic head, so that the productivity of such magnetic head cannot be enhanced.
SUMMARY OF THE INVENTION
The present invention aims at eliminating the drawbacks found in the above-mentioned conventional magnetic head.
It is an object of the invention to provide a magnetic head for a magnetic disc and a method for manufacturing the same which can enhance the productivity thereof by incorporating therein a plurality of head cores having different recording densities in an integral manner.
It is another object of the invention to provide a magnetic head for a low order floppy disc as well as a high-density floppy disc, in which coils can be wound easily.
According to the present invention, there is provided a magnetic head for a magnetic disc, characterized in that: there are formed a plurality of cut-out portions in an integrally formed slider, a plurality of head cores having different recording densities are respectively inserted into the plurality of cut-out portions, and the plurality of head cores having different recording densities are mounted in the integrally formed slider, that is, in the same slider.
Also, according to the present invention, there is provided a method for manufacturing a magnetic head for a magnetic disc, which comprises the steps of: cutting a slider block to form a plurality of cut-out portions to thereby produce an integrally formed slider; inserting and fixing a plurality of head cores having different recording densities into the plurality of cut-out portions respectively; and mounting the plurality of head cores having different recording densities into the integrally formed slider or in the same slider.
Further, according to the present invention, there is provided out of the above-mentioned plurality of cut-out portions, a first cut-out portion allowing a first head core to be inserted thereinto and a second cut-out portion allowing a second head core to be inserted thereinto are opened up in the same surface of the slider and are arranged in parallel to each other, and the plurality of head cores are mounted in the slider in such a manner that they are arranged in parallel to each other.
Still further, according to the present invention, there is provided the first cut-out portion, into which the first head core can be inserted, is formed in such a manner that it is opened up in one surface of the slider; the second cut-out portion, into which the second head core can be inserted, is opened up in the other surface of the slider on the opposite side thereof to the one surface, and the second cut-out portion is formed in such a manner that it extends on the same line as the first cut-out portion; and, the plurality of head cores are mounted in the slider in such a manner that they respectively extend on the same line.
Yet further, according to the present invention, there is provided the first cut-out portion for insertion of the first head core is formed in such a manner that it is opened up in one surface of the slider; the second cut-out portion for insertion of the second head core is opened up in the other surface of the slider on the opposite side thereof to the one surface; and, the plurality of head cores are mounted in said slider in such a manner that they alternate each other in position.
In attaining the above object, according to the invention, there is provided a magnetic head for a floppy disc, comprising: a slider; a plurality of cut-out portions respectively formed in the slider such that they extend vertically from one side surface of the slider and extend through the slider in the vertical direction thereof; a plurality of head cores having different recording densities and formed to be inserted into their respective ones of the above-mentioned cut-out portions; a plurality of coil winding grooves formed in the slider such that they extend vertically from the slider one side surface and define head core hold portions in the top and bottom portions of the slider; and, recording and reproducing coils respectively wound around their respective head cores within the coil winding grooves, wherein the coil winding grooves include, in the slider one side surface, one or mo

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