JPH0877507A - Magnetic head - Google Patents

Abstract

(57) [Summary] [Object] To provide a magnetic head which can be manufactured by a simple manufacturing process and can be reduced in cost. A front core 1 having a magnetic head for recording / reproducing on / from a magnetic recording medium such as a flexible disk, in which a predetermined magnetic gap is formed on a sliding surface of the magnetic recording medium
0, a first leg portion, a second leg portion, and a third leg portion are formed in a substantially E shape so as to be arranged in this order, and end portions of these leg portions are joined to the front core 10 20 and a first leg arranged to wind the first leg of the back core 20.
Coil 30, a second coil 40 arranged so as to wind the third leg portion of the back core 20, and the back core 20.
It is composed of a slider 50 joined to the. The front core 10 is preferably substantially I-shaped so that the surface to be joined to the back core is a flat surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for recording / reproducing on / from a magnetic recording medium such as a flexible disk.

[0002]

2. Description of the Related Art Flexible disks, which are disk-shaped magnetic recording media, are used in a very wide range as external storage devices such as computers and word processors because they are relatively easy to handle and can record a large amount of data. ing.

A magnetic head having a slider attached to a gimbal is generally used in a flexible disk drive device for recording / reproducing information on / from the flexible disk.

The magnetic head, as shown in FIG.
A substantially E-shaped front core 210 having a magnetic gap for recording / reproducing and a magnetic gap for erasing, sliders 221, 222 arranged so as to sandwich the front core 210 for ensuring contact with a magnetic recording medium, Approximately E that forms a closed magnetic circuit in cooperation with the front core 210
From a character-shaped back core 230, a coil bobbin 241 wound with a coil 240 for supplying an erasing current, and a coil bobbin 251 wound with a coil 250 for supplying or taking out a signal by an electromagnetic conversion action. Composed.

The front core 210 and the slider 2
When manufacturing 21, 222, first, as shown in FIG. 14, a pair of magnetic bodies 212c, 212d in which predetermined track width regulating grooves 212a and glass filling grooves 212b are formed.
The erasing front core block 212e, which is formed by joining via the erasing magnetic gap, and the pair of magnetic bodies 211c and 211d in which the predetermined track width regulating groove 211a and the glass filling groove 211b are formed, are connected to the erasing magnetic gap. Recording / reproducing front core block 2 formed by joining via
11e and the front core block 21 as shown in FIG.
0a is produced.

Next, the front core block 210a.
Is cut out in parallel with the track direction so as to have a predetermined thickness t3, as shown by a broken line in the figure, and a front core 210 as shown in FIG. 16 is manufactured. Here, one recording / reproducing magnetic gap g4 is formed so as to be located at the center of a predetermined track, and the erasing magnetic gaps g5, g6 are formed.
Are formed so as to be located on both sides of a predetermined track.

Next, as shown in FIG. 17, in order to secure the contact characteristic with respect to the magnetic recording medium, the slider 22
The front core 210 is sandwiched between 1 and 222, and the front core 210 and the sliders 221 and 222 are joined.

Next, as shown in FIG. 18, the front core 210 and the sliders 221 and 222 are grooved on the surface opposite to the sliding surface of the magnetic recording medium to insert the coil bobbins 241 and 251. To form a groove. In this way, the front core 210 has three legs 213, 21.
Sliders 221 and 22 which are formed in a substantially E shape having 4, 215 and are joined to the front core 210.
2 is formed to have a shape corresponding to the shape of the front core 210.

The front core 210 manufactured in this way
As shown in FIG. 13, the sliders 221 and 222 have a back core 230 and two coils 240 and 250.
And a magnetic head. That is, the leg 213 at one end of the front core 210 and the leg 231 at one end of the back core 230 are inserted into one coil bobbin 241 such that they overlap each other, and the other leg 231 of the front core 210 is inserted. The leg portion 215 at the end and the leg portion 233 at the other end of the back core 230 are inserted into the other coil bobbin 251 so as to overlap each other. At this time, the core pressing member 260 made of a spring material is also inserted into the coil bobbins 241, 251. By this core pressing member 260, the legs of the front core 210 and the back core 230 are pressed and supported for magnetic coupling. Thus, the front core 210 and the back core 230
Also, a magnetic head having a magnetic circuit portion including the coils 240 and 250 is configured.

[0010]

In the above magnetic head,
As described above, when the front core and the slider are processed, it is necessary to join the front core and the slider, and to form a groove after joining them, which complicates the process. Therefore, it takes a lot of time and labor to form the front core and the slider. Therefore, the cost of forming the front core and the slider is high, and the cost of the magnetic head is increased.

Further, in the above magnetic head, when the front core is cut out from the front core block, it is necessary to cut it out largely in consideration of the legs of the front core which will be formed in a later step. Therefore, the number of front cores that can be cut out from the front core block is small, which causes an increase in cost of the magnetic head.

Therefore, the present invention has been proposed in view of such a conventional situation, and an object of the present invention is to provide a magnetic head which can be manufactured by a simple manufacturing process and can be reduced in cost. .

[0013]

A magnetic head of the present invention completed to achieve the above object comprises a front core having a predetermined magnetic gap formed on a sliding surface of a magnetic recording medium, and a first core. The leg portion, the second leg portion, and the third leg portion are formed in a substantially E shape so as to be arranged in this order, and end portions of these leg portions are joined to the front core. A first coil arranged so as to wind the legs of the
Second arranged to wind the third leg of the back core
And a slider bonded to the back core.

In the above magnetic head, the shape of the front core is arbitrary, and for example, the front core may have some leg portions corresponding to the leg portions of the back core, but in consideration of ease of production and productivity. Then, the joint surface with the back core is preferably a flat surface.

Further, the joining structure of the front core and the back core is not particularly limited as long as they are magnetically joined. For example, a structure joined by an adhesive or a sandwiching by a core pressing spring. And the like.

The slider is formed into a substantially L-shaped cross section, one end of which is joined to the back core and the other end of which is flush with the magnetic recording medium sliding surface of the front core. As a result, the end of the slider, which is arranged so as to be at the same height as the magnetic recording medium sliding surface of the front core, comes into sliding contact with the magnetic recording medium together with the magnetic recording medium sliding surface of the front core. The hit characteristic is secured.

[0017]

According to the present invention, it is not necessary to join the slider to the front core. Further, it is not necessary to perform groove processing on the front core. Therefore, the front core can be easily formed.

Further, when the front core is formed in a substantially I-shape with the flat surface of the front core joined to the back core, there is no leg of the front core, so that the shape of the front core becomes small. . Therefore, more front cores can be cut out from the front core block.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

As shown in FIGS. 1 and 2, the magnetic head of this embodiment has a substantially I-shaped front core 10 having a predetermined magnetic gap formed on a sliding surface of a magnetic recording medium, and a first core.
Leg portion 21, second leg portion 22, and third leg portion 23 are formed in a substantially E shape so as to be arranged in this order.
The back core 20 joined to the front core 10 at the end portions 21a, 22a, and 23a of the second core 22 and the first leg portion 21 of the back core 20 wound around the first leg portion 21 of the back core 20.
Coil 30, a second coil 40 arranged to wind the third leg portion 23 of the back core 20, and a slider 50 joined to the back core 20.

The front core 10 comprises a recording / reproducing front core 11 and an erasing front core 12, which are joined together via a non-magnetic body 13 so as not to magnetically interfere with each other. Then, the recording / reproducing front core 11
Is a pair of magnetic bodies 1 through a recording / reproducing magnetic gap g1 arranged at the center of a predetermined track.
4 and 15 are joined together. On the other hand, the erasing front core 12 is formed by joining a pair of magnetic bodies 16 and 17 via erasing magnetic gaps g2 and g3 arranged so as to be located on both sides of a predetermined track.

When the front core 10 is manufactured, first, as shown in FIG. 3, a pair of magnetic bodies 12c and 12d in which a predetermined track width regulating groove 12a and a glass filling groove 12b are formed are erased. An erasing front core block 12e formed by joining via a magnetic gap, and a pair of magnetic bodies 11c, 11d formed with a predetermined track width regulating groove 11a and a glass filling groove 11b are joined via a recording / reproducing magnetic gap. The recording / reproducing front core block 11e thus formed is joined by a glass fusion or the like via a non-magnetic material to produce a front core block 10a as shown in FIG.

Next, this front core block 10a
As shown by the broken line in the drawing, the cutout is cut in parallel to the track direction to have a predetermined thickness t1, and the cutout is cut to have a predetermined height t2 in the depth direction of the magnetic gap, as shown in FIG. The front core 10 is manufactured.
Here, one recording / reproducing magnetic gap g1 is formed so as to be located at the center of a predetermined track, and two erasing magnetic gaps g2 and g3 are formed so as to be located on both sides of the predetermined track. It When the front core 10 is cut out from the front core block 10a in this way, the height t2 of the front core 10 is determined by
Since it is not necessary to provide a leg portion in the, it can be lowered. Therefore, from the front core block 10a to the plurality of front cores 1 in the height direction of the magnetic gap.
You can cut out 0.

The back core 20 is made of a magnetic material,
As will be described later, the first coil 30 and the second coil 40
And is joined to the surface of the front core opposite to the sliding surface of the magnetic recording medium. That is, the first leg 21
End portion 21a of the second leg portion 22 is joined to the end portion of the erasing front core 12, and the end portion 22a of the second leg portion 22 is joined to the joining portion of the erasing front core 12 and the recording / reproducing front core 11. The end portion 23a of the third leg portion 23 is joined to the end portion of the recording / reproducing front core 11. Then, the first closed magnetic path passing through the first leg portion 21 of the back core 20, the erasing front core 12, and the second leg portion 22 of the back core 20, and the second leg portion 22 of the back core 20. The recording / reproducing front core 11 and the third leg portion 23 of the back core 20.
To form a second closed magnetic circuit.

The first coil 30 is a coil for supplying an erasing current, and is wound around a coil bobbin 32 having an opening 31 in the center, and the opening 31 is provided with a first coil of the back core 20. The legs 21 are inserted. Thus, the first coil 30 is incorporated so as to wind the first leg portion 21 of the back core 20. On the other hand, the second coil 40 is a coil for supplying or extracting a signal by an electromagnetic conversion action, and is wound around a coil bobbin 42 having an opening 41 in the center, and the opening 41 has a back core. The third leg 23 of 20 is inserted.
Thus, the second coil 41 is connected to the third coil of the back core 20.
The leg portion 23 of the above is incorporated so as to be wound.

The slider 50 is made of ceramic or the like having a substantially L-shaped cross section, extends in parallel with the front core 10 and the back core 20, and extends at the same height as the sliding surface of the magnetic recording medium. The extending portion 51 and the back core 2
The connecting portion 52 is connected to 0 and extends in a direction orthogonal to the extending portion 51. That is, the end 50a of the slider 50 on the side of the connecting portion 52 is joined to the back core 20, and the end 50b of the slider 50 on the side of the extending portion 51 extends at the same height as the magnetic recording medium sliding surface of the front core 10. Arranged to get out. Here, the slider 50 and the back core 20
Are joined by an adhesive such as an organic resin or glass fusion. As a result, the end portion 50b of the slider 50 on the extending portion 51 side is brought into sliding contact with the magnetic recording medium together with the sliding surface of the front core 10 on the magnetic recording medium, and the contact property with respect to the magnetic recording medium is secured.

The slider 50 may be formed separately from the front core 10 instead of being formed by joining the front core with the front core and then subjecting the slider to groove processing. Therefore, the slider 50 can be easily formed.

In the above magnetic head, the front core 1
0 and the back core 20 may be magnetically bonded to each other. Specifically, for example, as shown in FIG. 6, the front core 10 and the back core 20 include a core pressing portion 6 made of a spring material that is bent so as to sandwich them.
It may be sandwiched and joined by core pressing springs 60 having both ends 1 and 62. That is, the front core 1
Nos. 18, notches 18 at both ends on the sliding surface side of the magnetic recording medium,
19 are formed, and the cutout portions 2 are formed at both ends of the lower surface of the back core 20 so as to correspond to the cutout portions 18 and 19.
4, 25 are formed, and the cutout portions 18, 19 of the front core 10 and the cutout portions 24 of the back core 20 are formed.
The front core 10 and the back core 20 may be fixed and joined by sandwiching the core retainers 61 and 62 at both ends of the core retainer spring 60 so as to sandwich 25.

Alternatively, as shown in FIG. 7, the front core 10 and the back core 20 are fixed and joined by an adhesive 70 such as an organic resin applied around the joint between the front core 10 and the back core 20. May be. That is, while holding the front core 10 and the back core 20 with a jig or the like or fixing the front core 10 and the back core 20 with the core holding spring as described above, the periphery of the joint portion of the front core 10 and the back core 20 The front core 10 and the back core 20 may be fixed and joined by applying an adhesive 70 such as an organic resin to the.

The front core 10 and the back core 20
The joining may be performed only by the core pressing spring, only by the adhesive, or by both the core pressing spring and the adhesive.

The magnetic head thus manufactured is attached to a gimbal and incorporated into a flexible disk drive device for recording / reproducing information on / from a flexible disk.

When the magnetic head is attached to the gimbal, for example, first, as shown in FIG.
The magnetic head 100 is temporarily fixed to a predetermined position on the head mounting surface 101a, that is, the surface facing the flexible disk, with an instant adhesive.

Next, as shown in FIG. 9, the magnetic head 10
The magnetic shield member 1 disposed around the outer periphery of the magnetic head 100 to reinforce the adhesive strength of 0 and prevent the leakage magnetic field from the outside from entering the magnetic head 100.
To fix 02, an ultraviolet curable resin 103 is applied between the head mounting surface 101a of the gimbal 101 and the outer periphery of the magnetic head 100. Then, after the magnetic shield member 102 is arranged on the outer periphery of the magnetic head 100, the ultraviolet curable resin 103 is cured, and the magnetic head 10
0 and the magnetic shield member 102 are fixed to the gimbal 101.

Next, as shown in FIG. 10, the gimbal 10
The flexible printed circuit board 104 is attached to the surface 101b opposite to the head mounting surface 101a of No. 1, ie, the back surface of the gimbal. At this time, the flexible printed circuit board 104
The land 104a and the terminal pin 105 of the coil bobbin are soldered so that signals can be input and output to and from the coil.

Thus, as shown in FIG. 11, the magnetic head 100 is attached to the gimbal 101 together with the magnetic shield member 102 and the flexible printed board 104.

Then, as described above, when recording / reproducing information signals to / from the flexible disk using the magnetic head attached to the gimbal, usually, a pair of magnetic heads are used to perform both sides of the flexible disk. Recording and playback from.

That is, as shown in FIG. 12, both sides of a flexible disk 112 rotatably housed in a cartridge 111 in which a recording / reproducing opening 110 having a rectangular shape in plan view is opened. , A pair of magnetic heads 113, 114 attached to the gimbal
Distribute.

When performing recording / reproducing, one magnetic head 113 is exposed from one surface of the recording / reproducing opening 110, and the magnetic recording medium of the magnetic head 113 is slid on one surface of the flexible disk 112. The moving surface is brought into contact, and the other magnetic head 114 is exposed from the other surface of the recording / reproducing opening 110 to bring the magnetic recording medium sliding surface of the magnetic head 114 into contact with the other surface of the flexible disk 112. Then, recording and reproducing are performed on both sides simultaneously. At this time, the magnetic heads 113 and 114 are moved in the radial direction of the flexible disk 112 as the flexible disk 112 is rotated.

[0039]

As is apparent from the above description, according to the present invention, the front core can be easily formed, and
More front cores can be cut out from the front core block. Therefore, it is possible to reduce the cost for manufacturing the front core, which contributes most to the cost of the magnetic head.

Although the back core of the magnetic head of the present invention is formed larger than the conventional back core by the amount of the leg portion, the back core does not need to form a magnetic gap, so that the back core is formed on the front core. It can be formed more easily.
Therefore, even if the back core becomes large, there is almost no effect on the cost.

Further, according to the present invention, since the slider has a simple shape, and the slider only needs to be formed on one side of the front core, the steps required for forming the slider are simplified and the slider is manufactured. The cost when doing can be reduced.

Therefore, according to the present invention, it is possible to provide a magnetic head which can be manufactured by a simple manufacturing process and whose cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration example of a magnetic head to which the present invention is applied.

FIG. 2 is a perspective view showing a configuration example of a magnetic head to which the present invention is applied.

FIG. 3 is a perspective view showing an example of a process of manufacturing a front core block.

FIG. 4 is a perspective view showing an example of a front core block.

FIG. 5 is a perspective view showing an example of a front core.

FIG. 6 is an exploded perspective view showing an example of joining the front core and the back core with a core pressing spring.

FIG. 7 is a perspective view showing an example of joining a front core and a back core with an adhesive.

FIG. 8 is a perspective view showing an example of a step of temporarily fixing the magnetic head to the gimbal.

FIG. 9 is a perspective view showing an example of a process of fixing the magnetic head and the magnetic shield member to the gimbal.

FIG. 10 is a perspective view showing an example of a step of attaching a printed board to a gimbal.

FIG. 11 is a perspective view showing an example of a magnetic head attached to a gimbal.

FIG. 12 is a perspective view schematically showing correspondence between a magnetic head and a flexible disk.

FIG. 13 is an exploded perspective view showing the configuration of a conventional magnetic head.

FIG. 14 is a perspective view showing a process of manufacturing a conventional front core block.

FIG. 15 is a perspective view showing a conventional front core block.

FIG. 16 is a perspective view showing a conventional front core.

FIG. 17 is a perspective view showing a step of sandwiching a conventional front core with a slider.

FIG. 18 is a perspective view showing a front core and a slider in which a groove for inserting a conventional coil bobbin is formed.

[Explanation of symbols]

 10 front core 11 recording / reproducing front core 12 erasing front core 13 non-magnetic material 14, 15, 16, 17 magnetic material 20 back core 21 first leg portion 22 second leg portion 23 third leg portion 30, 40 coil 31,41 opening 32,42 coil bobbin 50 slider 51 extension part 52 connection part 60 core pressing spring 61,62 core pressing part 70 adhesive g1 recording / reproducing magnetic gap g2, g3 erasing magnetic gap

Claims (5)

[Claims] 1. A front core having a predetermined magnetic gap formed on a sliding surface of a magnetic recording medium, a first leg portion, a second leg portion, and a third leg portion arranged substantially in this order so as to be arranged in this order. A first core formed in a letter shape, and the ends of the legs are joined to the front core and the first leg of the back core wound around the back core.
Coil and the second leg arranged to wind the third leg of the back core
A magnetic head comprising a coil and a slider bonded to the back core. 2. The joining surface of the front core and the back core is a flat surface.
The magnetic head described. 3. The front core and the back core,
2. Bonding with an adhesive agent.
Alternatively, the magnetic head described in 2. 4. The front core and the back core are
The magnetic head according to claim 1, wherein the magnetic head is sandwiched by core pressing springs and bonded. 5. The slider is formed to have a substantially L-shaped cross section, one end of which is joined to the back core, and the other end of which is flush with the magnetic recording medium sliding surface of the front core. 5. The method according to claim 1, 2, 3 or 4.
The magnetic head described.