JPH05290348A - Composite magnetic head and its production - Google Patents

Abstract

PURPOSE:To decrease the crosstalks between magnetic heads by shifting the positions of magnetic cores facing each other of the composite magnetic head for which the magnetic heads are selectively used according to recording and reproducing modes from each other. CONSTITUTION:The positional relations of a third magnetic core 103 and fourth magnetic core 104 forming a second gap 14 with a first magnetic core 101 and second magnetic core 102 forming a first gap 10 are so set that the rear end of the second magnetic core 102 and the second gap 14 are aligned. The first gap 10 and the third magnetic core 103 are so integrated via a slider constituting body that the rear ends thereof are aligned, by which the composite magnetic head is constituted. The positions of the magnetic cores of the magnetic heads facing each other in such a manner are shifted from each other and, therefore, the opposite area is diminished and the crosstalks between the magnetic heads are decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite magnetic head mounted on a flexible disk drive or the like and a method for manufacturing the same, and more particularly to a specific structure for reducing crosstalk between two magnetic heads mounted on the same slider. And its manufacturing method is characterized.

[0002]

2. Description of the Related Art In recent years, a flexible disk drive (abbreviated as FDD) has been developed in the direction of higher density, and the recording track width and the track interval formed on a recording medium can be reduced to improve the performance. It is densified. For this reason, in order to make the recording / reproducing compatibility with the conventional recording pattern of the track width, the track width is different.
It is also considered and practiced to use a composite magnetic head in which different types of magnetic heads are mounted on the same slider, and selectively use these magnetic heads according to the recording / reproducing mode.

A conventional composite magnetic head of this type will be described below. FIG. 6 shows a conventional FDD magnetic head. In FIG. 6, 1 is a first data track magnetic head having a first head gap 9, 2 is a second data track magnetic head having a second head gap 4, and 3 is a slider structure made of ceramics. ,
Reference numeral 5 is an air bleeding groove, and 6 is a winding groove.

The composite magnetic head for FDD constructed as above will be described in more detail. Two types of magnetic heads 1 and 2 having different data track widths, which are manufactured independently of each other, are arranged in the scanning direction 7 of the recording medium. These magnetic heads 1 and 2 are selectively used in accordance with the recording / reproducing mode by joining them in parallel via a slider structure. Further, the center point intervals of the gaps 9 and 4 of the two different magnetic heads 1 and 2 are made to correspond to a constant interval, for example, an integral multiple Ll of the pitch of each data track, and the two magnetic heads 1 and 2 are The gap distance is set to a fixed distance, for example, a distance G1 determined from the correlation between the respective data tracks.

[0005]

However, in the above-mentioned conventional structure, since the two magnetic heads 1 and 2 are arranged to face each other, there is a problem that crosstalk occurs between the magnetic heads. .. In addition, 2 independently manufactured
When one magnetic head is bonded via a slider, a deviation is likely to occur, and there is a problem in that the gap Ll between the center points of the two magnetic heads and the gap distance Gl cannot be accurately determined. Was there.

The present invention solves the above-mentioned conventional problems, and provides a composite magnetic head which reduces crosstalk between the magnetic heads and further improves the positional dimensional accuracy between the magnetic head cores, and a manufacturing method thereof. With the goal.

[0007]

In order to achieve this object, a composite magnetic head according to the present invention comprises a first magnetic head and a second magnetic head which are composed of first and second magnetic cores forming a first gap. A second magnetic head including a third magnetic core and a fourth magnetic core forming a gap is arranged such that the first gap and the end edge of the third magnetic core coincide with each other, and the second gap and the second magnetic head are aligned with each other. The magnetic core is integrated with the slider at a predetermined interval so as to match the edge of the magnetic core.

[0008]

According to this structure, since one of the two magnetic cores forming each of the two magnetic heads is not arranged to face each other, crosstalk between the magnetic heads is reduced. Further, since the two magnetic cores forming the magnetic heads are arranged such that one end edges of the two magnetic cores are located on the same line, it is easy to regulate the relative positions of the two head gaps during manufacturing. Is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state in which a winding is removed from an embodiment of a composite magnetic head of the present invention, 11 is a first magnetic head having a first data track head gap 10, and 12 is a second magnetic head. Second magnetic head having a data track head gap 14, 13 is a slider structure made of ceramic, 8 is a bonding glass, D is a depth length, 15 is an air bleeding groove, 16 is a winding bobbin insertion groove, 52 , 53 are magnetic back bars. Then, the distance Ll between the center points of the gaps of the two first and second magnetic heads 11 and 12 is set to an integral multiple of the pitch of the data track,
Further, the gap distance G between the two magnetic heads 11 and 12 is
l is set to the distance determined from the data track correlation.

The positional relationship between the first magnetic core 101 forming the first gap 10 and the third magnetic core 103 forming the second gap 14 with respect to the second magnetic core 102 and the fourth magnetic core 104 is the second. The edge of the magnetic core 102 and the second gap 14 coincide with each other, and the first gap 10 and the third gap 14
The magnetic core 103 is integrated via a slider structure so that the edge of the magnetic core 103 coincides with that of the magnetic core 103 to form a composite magnetic head.

A method of manufacturing the magnetic head having the above structure will be described with reference to FIGS. 2, 3, 5, and 6. First, as shown in FIG. 2A, a plurality of layers having a thickness equal to the first data track width Tw1 are formed through the first non-magnetic layer 20 (eg, ceramic) having the determined first thickness Sw1. First magnetic layer 21 (for example, sendust)
The 1st block 22 which joined alternately is created. Further, as shown in FIG. 2B, a second magnetic layer 25 having a width equal to the second data track width Tw2 and a third magnetic layer 24 having a width equal to the first data track width Tw1. A plurality of those bonded together via the second non-magnetic layer 23, and a plurality of those bonded together via the third non-magnetic layer 39
Block 26 is formed.

At this time, the width of the second non-magnetic layer 23 is such that the distance between the center of the joined second magnetic layer 25 and the center of the third magnetic layer 24 is the head of FIG. Distance L
The width of the third non-magnetic layer 39 is set to be equal to 1 and the distance between the third magnetic layers 24 is set to the distance Sw1. The thickness of the second block 26 is set to be equal to Gl in FIG.

Further, as shown in FIG. 2C, a plurality of fourth magnetic layers 28 having a width equal to the second data track width Tw2 and a fourth non-magnetic layer 27 having a width Sw2 are formed. The third blocks 29 are formed by being joined alternately.

Next, as shown in FIG. 3 (a), after the gap facing surface 17 of the first block 22 is mirror-finished, a first winding groove is formed in a direction traversing the first data magnetic layer body 21. Process 30. Then, a gap forming layer 31 having a predetermined thickness and serving as a first head gap is formed on the gap facing surface 17.
(For example, SiO ₂ ) is formed by vapor deposition or sputtering, and both gap facing surfaces 33 and 34 of the second block 26 are mirror-finished as shown in FIG. 3B.

Next, as shown in FIG. 3C, after the gap facing surface 36 of the third block 29 is mirror-finished, the second winding groove 37 is formed in the direction crossing the fourth magnetic layer 28. Is processed to form a gap forming layer 38 (for example, SiO ₂ ) having a predetermined thickness on the gap facing surface 36 by vapor deposition or sputtering.

Next, as shown in FIG. 4, the second block 26
And the first block 22 in which the first winding groove 30 is formed and the third block 29 in which the second winding groove 37 is formed, the first and second winding grooves 30. , 37 are opposed to each other via the second block 26, and the first magnetic layer 21 and the second magnetic layer 21
Of the magnetic layer 25, the third magnetic layer 24, and the fourth magnetic layer 28 via the first gap forming film 31 and the second gap forming film 38, respectively, and the depth D1 of the first block 22. And the depth D3 of the third block are aligned and pressed so that the depth D3 does not shift, and the glass grooves 4 are placed in the winding grooves 30 and 37.
0 is inserted and joined to form a joined body 41.

Next, as shown in FIG. 5, an air bleed groove 15 is formed in the joined body 41, and a winding bobbin insertion groove 45 is formed on the surface opposite to the air bleed groove 15, and then the dotted line A in FIG. Cut along to obtain the construct of FIG. This structure is further cut into a slider width Sw at the time of completion at a cutting allowance Cw at a broken line 46 to form three composite magnetic head cores 47 having a slider width Sw. Winding bobbins 50 and 51 are inserted into the thus-formed composite magnetic head cores respectively to carry out head windings, and then the back bars 52 are magnetically coupled to the first and second magnetic cores 101 and 102. Then, the back bar 53 is joined so as to magnetically couple the third and fourth magnetic cores 103 and 104, and the composite head shown in FIG. 1 is manufactured.

[0018]

As described above, the present invention is a composite magnetic head equipped with two magnetic heads having a recording / reproducing gap, and a composite magnetic head that selectively uses these magnetic heads according to the recording / reproducing mode. In the magnetic head, since the positions of the magnetic cores of the magnetic heads facing each other are offset from each other, the facing area becomes small and crosstalk between the magnetic heads is reduced. Further, since the two magnetic cores forming the two magnetic heads forming the respective magnetic heads are arranged such that one end edges of one of the two magnetic cores are located on the same line as each other, the two head gaps at the time of manufacture are It is easy to regulate the target position.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a composite magnetic head of the present invention.

FIG. 2 is a perspective view of each component block in each manufacturing process of the same embodiment.

FIG. 3 is a perspective view of each component block in each manufacturing process of the embodiment.

FIG. 4 is a perspective view of a component block in the manufacturing process of the embodiment.

FIG. 5 is a perspective view of a component block in the manufacturing process of the embodiment.

FIG. 6 is a perspective view showing a conventional composite magnetic head for FDD.

[Explanation of symbols]

1,11 First data track magnetic head 2,12 Second data track magnetic head 3,13 Slider structure 4,9,10,14 Gap 5,15 Air bleed groove 6,30,37 For winding Grooves 20, 23, 27, 39 Non-magnetic layer 101 First magnetic core 102 Second magnetic core 103 Third magnetic core 104 Fourth magnetic core 21 First magnetic layer 25 Second magnetic layer 24 Third Magnetic substance layer 28 Fourth magnetic substance layer 22 First block 26 Second block 29 Third block 17, 33, 34, 36 Gap facing surface 31, 38 Gap constituent layer 41 Joined body 16, 45 Winding bobbin insertion groove 46 cutting part 47 composite magnetic head core Gl distance determined from data track correlation of two Ll integer multiple of pitch of two data tracks Sw1 first thickness Sw 2 Second thickness Tw1 First data track width Tw2 Second data track width

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Morimoto 2-2-10, Kotobuki-cho, Takamatsu-shi, Kagawa Matsushita Electronics Industry Co., Ltd.

Claims (2)

[Claims] 1. A first magnetic head composed of first and second magnetic cores forming a first gap, and a second magnetic head composed of third and fourth magnetic cores forming a second gap. Integrated with a predetermined gap so that the first gap and the edge of the third magnetic core are aligned with each other and the second gap and the edge of the second magnetic core are aligned with each other. Compact magnetic head. 2. A first thickness Sw that is predetermined respectively.
The first magnetic layer 21 having a thickness equal to the first track width Tw1 is sequentially provided via the first non-magnetic layer 20.
Of the first block 22, a step of forming a first winding groove 30 in a direction crossing the first magnetic layer on one side surface of the first block 22, and the first thickness. S
A plurality of second magnetic layers 25 each having a thickness equal to the first track width Tw1 are provided through the non-magnetic layer 20 of w1 and the second magnetic layers 25 are formed by a predetermined second distance from the second magnetic layers. A step of forming a second block 26 having a plurality of third magnetic layers each having a thickness equal to the second track width Tw2 at positions separated by the magnetic layer, and a second predetermined thickness A third block 29 sequentially having a plurality of fourth magnetic layers 28 having a thickness equal to the second track width Tw2 via a non-magnetic layer 27 having a width Sw2, and the third step 29. A step of forming a second winding groove 37 in a direction crossing the fourth magnetic layer on one side surface of the block; and a step of forming the second winding groove and the first and third winding grooves 37. A block and the first and second winding grooves face each other through the second block. The first magnetic layer and the second magnetic layer, and the third magnetic layer and the fourth magnetic layer are bonded so as to face each other via the non-magnetic films forming the first and second gaps, respectively. And a step of cutting the joined body so that the first and second gaps are present in the respective joining blocks, and a step of applying head windings to the winding grooves, respectively. Magnetic head manufacturing method.