JPS58196619A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To obtain a floating magnetic head which is capable of read-after- write, by joining magnetic material blocks to the front and rear sides of a slider block and forming both producing and reproducing magnetic heads in a straight line and in the moving direction of a magnetic medium. CONSTITUTION:I-shaped core blocks 102 and 103 are joined to the front and back sides of a nonmagnetic slider block 101 respectively to form the 1st bonding block 100. Then C-shaped magnetic core blocks 104 and 105 are joined to the front and back sides of the block 100 to obtain the 2nd bonding block 110. A recording gap 114 and a reproducing gap 115 are formed to the fron tand back sides of the block 110 respectively, and a groove 122 is formed to the side opposite to a slider surface. Then the block is cut at a cutting face 111 (shown by dotted lines) to obtain plural core slider assembly 112. The necessary processing is applied to the assembly 112 to obtain a floating read-after-write type magnetic head 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a magnetic disk that floats on a high-speed moving magnetic medium such as a magnetic disk due to the action of airflow generated as the magnetic medium moves, and records and reproduces information. Regarding the head.

In conventional magnetic tape devices, it is common to improve the reliability of so-called read-after-write information, which retrieves information immediately after it is recorded. However, magnetic disk drives do not perform read-after-write. This is because a magnetic head suitable for use as a floating magnetic head and capable of read-after-writing has not been obtained.

For example, the magnetic head used in a magnetic pool device is too large in size and x-casing to be used as a floating magnetic head.

Further, Japanese Patent Application No. 54-49109 discloses a composite magnetic head for a magnetic disk device which is provided with separate gears for recording and reproducing. Since Hitoshi's composite magnetic head is a Seizo system in which the recording medium is moved in the direction of movement (first the reproducing cap and then the recording gap), read-after-write is not possible.

Furthermore, even if the arrangement of the recording gap and the reproducing gap is reversed, this composite magnetic head is manufactured using a thin film process and therefore has no structure, so □If read-after-write is performed, coupling noise will be large. This is not practical.

OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic head that can be used as a floating magnetic head in a magnetic disk drive or the like and is capable of read-after-write.

Another object of the present invention is to provide a method for manufacturing such a magnetic head.

The magnetic head according to the present invention includes a slider base made of a non-magnetic material, first and second core members made of a magnetic material bonded to the airflow inflow side and the airflow outflow side of the slider base, respectively, and the slider base member made of a magnetic material. joined to the core member of 1,
an eighth core member made of a magnetic material that together forms a closed magnetic circuit; and a fourth core member made of a magnetic material that is joined together with the second core member (the second core member) and forms a closed magnetic circuit together. A slider surface for receiving an air flow to generate a force for stably floating the magnetic head, and the first and eighth cores are provided on the side facing the magnetic medium of the structure. A recording gap is formed at the mutual joint of the members, and a reproduction gap is formed at the mutual joint of the second and fourth core members.These two gaps are aligned in the direction of movement of the magnetic medium. Formed by aligning.

The method for manufacturing a magnetic head according to the present invention is as follows (i
The magnetic head of the present invention as described above is manufactured by steps including steps ) to (vi).

On the front and rear sides of the slider block made of non-magnetic material,
Step (i) of bonding core blocks of magnetic material to form a first bonding block.

The front S
Step (ii) of processing the front and rear surfaces of the aluminum bonding block.

step (iii) of bonding core blocks of magnetic material to the front and rear surfaces of the first bonding block after step (ii), respectively, to form a second bonding block;
.

The surface of the second bonding block facing the magnetic medium is processed to form a bond between two core blocks bonded to the front surface of the second bonding block, and a rear surface of the second bonding block. Step (iv) of forming a recording gap and a reproduction gap each having a predetermined gap depth at the mutual joint of the two core blocks joined to each other.

step (step of cutting the second bonding flock after irradiation and dividing it into a plurality of core slider assemblies).

(vi) machining the surface of the core slider assembly into a predetermined shape and size;

Embodiment of the Invention An embodiment of the present invention will be explained with reference to FIGS. 1 to 5. FIG. Here, FIGS. 1 and 2 are perspective views showing the manufacturing steps of the magnetic head. FIGS. 8 and 4 are a perspective view and a plan view of the completed magnetic head (some elements such as the FC output coil are not shown) as viewed from the side facing the magnetic medium.

Moreover, FIG. 5 is a sectional view of the v-v line in FIG. 4, and is shown in association with magnetism [8].

First, we will explain the manufacturing process step by step.

In FIG. 1, 101 is a plate-shaped slider block made of a non-magnetic material, for example, non-magnetic ceramics. This slider block 101 is polished to a predetermined size. Thereafter, plate-shaped I core blocks 102 and 108 made of magnetic material and finished to predetermined dimensions are bonded to the front surface and vk surface of this slider block 101 by glass welding technology, thereby creating a first bonding block direction. Ru. After finish grinding each 1g11 surface facing the pounding block, (2) finish the thickness of the core blocks 102 and 108, that is, dimension 8 and dimension C in the figure, to predetermined dimensions by polishing. For example, 8 dimensions are 10 to 50 microns,
The C dimension is finished to about 500 microns. In reducing the recording demagnetization phenomenon of the recording head core (formed by 102 and 105), it is generally advantageous to reduce the 8 dimension.
First, on the front and rear surfaces of the first bonding flock 100, C core blocks 104 and 105 each made of a separately prepared magnetic material and having a substantially C-shaped cross section are formed to form desired voids by, for example, glass welding technology. A second bonding ink block 110 as shown in FIG.
is made. When used as a Cm magnetic head opposed to the magnetic medium of this second bonding 110)
A gap 114 whose surface 106 is polished and is used as an 8-pin recording gap 14 and a reproduction gap 15 (described later)
, 115 are finished to the desired depth.

Also, before polishing the surface 106, the long surface is polished, and the groove for the support spring? 2 (described later), a length of $122 is processed.

Then, the bonding block 110 is cut off WTfi 11
1 and is divided into a plurality of core slider assemblies 112. The individual core slider assemblies 112 are processed into predetermined shapes and dimensions, and finished into magnetic head assemblies 1 as shown in FIGS. 8 to 5.

Next, the structure of the completed magnetic head will be explained with reference to FIGS. 8 to 5.

The magnetic head assembly l includes a slider base 2, a core member 8.
4. 5. 6.11 is an integrated structure.

The slider base 2 is assembled from the slider block 101 of FIGS. 1 and 2 by the core member 8. 4. 5゜5', 6
．． 6', 11 are the above-mentioned C core blocks 104, 105
and (2) are parts created from core blocks 102 and 108, respectively. Further, 12.13 is a gap material that is filled when the above-mentioned C core blocks 104, 105 and 1) core blocks loz and 108 are joined, for example, by welding (=the glass used).

When a magnetic head is used, the magnetic head assembly l floats in a posture as schematically shown in FIG. 5 with respect to the magnetic medium 52. As the magnetic medium 52 moves at high speed in the direction of the arrow 51, an air flow is generated in the direction of the arrow 51. The core member 8.6' located on the side into which the airflow flows acts as a recording headgear section and forms a closed magnetic circuit. A recording gap 14 is formed at the joint between the core members 8 and 6' (on the side facing the magnetic medium 52). The core members 4, 5' on the outflow side of the air flow act as a reproducing rad core and form a closed magnetic circuit. A reproducing gap 15 is formed at the joint of the core member assembly 5' (opposed to the magnetic medium 52), and the depth of each gap 14.15 is equal to the depth of the gap 114.
It is finished to the predetermined dimensions in the processing step 5. As is clear from FIG. 4, the recording head core section and the reproducing head core section are separated from the core members 11 and 6 which are in contact with the moving direction 51 of the magnetic medium. This notch 21 reaches as far as the slider base 2, as shown in FIG.

h on the side of the magnetic head assembly 1 facing the magnetic medium 52;
A w-shaped slider surface is formed. This slider surface is used to stably float the magnetic head by receiving the air flow generated by the moving speed of the magnetic medium 52.
2 and a flat portion 81. The width of the flat portion 81, that is, the slider width is equal to the slope 41.
Defined by

Further, the width of the flat center slider surface portion on which information signals are recorded and reproduced, that is, the signal track width, is also defined by the sloped groove.

A groove η is provided on the back surface side (opposite the slider surface) of the magnetic head assembly l. A support spring (not shown) is attached to this groove n to support the magnetic head assembly l and float it above the disk surface, and a downward force W is applied thereto. Groove n
The processing position is such that its center position is the distance from the inflow end of the air flow.

The dimension of L is determined, for example, so that /l is in the range of 0.85 to 0.4 compared to the length l of the tapered flat surface. If determined in this way, the floating distance in the recording gap 14 and the floating distance in the reproducing gap 15)
This is advantageous in keeping the IR substantially equal.

Although not shown in the figure, a recording winding is wound around the core member 8 so as to pass through the window 16 between the core members 8 and 6'. Further, the regeneration winding is wound around the core part 4 so as to pass through the window 17 between the core parts 5'.

Embodiment 6: 11/4" magnetic device (mWf).

An excellent magnetic head that can be used as a floating magnetic head capable of door after-writing is obtained. A non-magnetic slider base 2 is placed between the recording head core section and the reproducing head core section.
intervening, coupling noise during read-after-write is extremely reduced. Further, the length and depth of the recording gap 14 and the reproduction gap 15 can be easily optimized independently. Furthermore, it is easy to make the thickness of the core member 6' of the recording head core portion sufficiently thin and control it with good precision, and recording demagnetization can be sufficiently reduced.

Effects of the Invention As detailed above, according to the present invention, it is possible to realize a practical magnetic head that floats on a magnetic medium such as a magnetic disk that moves at high speed and performs read-after-write. The effect is extremely large.

[Brief explanation of drawings]

1 to 5 illustrate one embodiment of the present invention, FIGS. 1 and 2 are perspective views showing the manufacturing process of the magnetic head, and FIGS. 8 and 4 are magnetic head assemblies. FIG. 5 is a perspective view and a plan view as seen from the side facing the magnetic medium. FIG. ■... Magnetic, Rad assembly, 2... Slider base,
:3゜6'...G core member for recording, 4,5'...core member for reproduction, 14...recording gap, 15...
Regeneration gap, 10°-ml ponding block, 101...Slider block, 102.108...
・I core block, 1o4゜105...C core block, 11()...Second bonding block, 112
... Core slider assembly, ■14, 115... Gap. Substitute P1 Hessuri Shi Usuki 81 O II Kou A Figure 1 Figure 2 Figure 10 Figure 3 Upper 1 Figure 4

Claims (2)

[Claims] (1) A magnetic head that is made of non-magnetic material and that floats on a magnetic medium that moves at high speed due to the action of airflow generated as the magnetic medium moves, and records and reproduces information on the magnetic medium. a slider base, first and second core members made of a magnetic material joined to the airflow inflow side and the airflow outflow side of the slider base, respectively; an eighth core member made of a magnetic material constituting a closed magnetic circuit together with the first core member; and the second core member;
and a fourth core member made of a magnetic material constituting a closed magnetic circuit together with a core member of A slider surface for generating a force for stably floating the magnetic head, a recording gap at the mutual joint of the first and eighth core members, and a mutual joint of the second and fourth core members. A read-after-write magnetic head, characterized in that a read gap is formed at each of the two gaps, and these two gaps are aligned in a straight line in the moving direction of the magnetic medium. (2) A method for manufacturing a magnetic head capable of read-after-writing, which floats on a magnetic medium by the action of airflow generated as the magnetic medium moves at high speed, and records and reproduces information on the magnetic medium. Step (i) of bonding core blocks made of magnetic material to the front and rear surfaces of the slider block made of non-magnetic material, respectively, to create a first bonding block; A step (ji) of processing the front and rear surfaces of the first bonding block, and after this step (ii) a core block of magnetic material is bonded to the front and plate surfaces of the first bonding block, respectively, and a second bonding block is formed. and processing the surface of the second bonding block facing the magnetic medium to form a mutual joint of the two core blocks joined to the front part of the second bonding block. , and forming a recording gap and a reproduction gap each having a predetermined gap depth at the mutual joint of the two core blocks joined to the rear surface portion of the second pounding flock. (i) After this step (iv), a step (V) of cutting the second bonding block and dividing the plurality of core slider assemblies into two parts.
and (vi) processing the acupuncture surface of the core slider assembly into a predetermined shape and size.