JPH01166320A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the uniformity of a gap depth by specifying a length in a vertical direction to a medium facing surface in the gap forming surface of a core in a side where the gap depth is determined. CONSTITUTION:In the both sides of a core 22, slider parts 23 and 24, which are made of a same material, are unitedly formed and the glass of a non- magnetic substance is injected and further joined through a separating layer 25 not to be a magnetic gap. The length to be vertical to the facing surface with a magnetic recording medium is caused to be equal in the facing surface, which faces to a common core 26 of the core 22, and the edge part of the facing surface to face to slider parts 28 and 29 of the slider parts 23 and 24. Accordingly, since the gap depth can be directly measured in the both side edge parts of a magnetic head, the gap depth can be caused to be the desired length while a mirror working is executed. Thus, the magnetic head can be manufactured to show a constant characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head used in a magnetic disk drive that writes data to and reads data from a magnetic recording medium.

BACKGROUND OF THE INVENTION A conventional magnetic head will be described below with reference to the drawings.

6 and 7 are a plan view and a perspective view showing a conventional magnetic head. In Figures 6 and 7, 1 is an L-shaped recording/reproducing core, and 2 and 3 are! A non-magnetic glass 4 is provided between the common cores 2 and 3 of the mold. 5 is an L-shaped erase core, 6 is a read/write gap provided between the recording/reproducing core 1 and the common core 2 and filled with non-magnetic glass, and 7 is provided between the erase core 5 and the common core 3. This is an erase gap filled with non-magnetic glass. At both ends of the read/write gap 6, holes 8 filled with non-magnetic glass are provided extending from the recording/reproducing core 1 to the common core 2. Holes 9 filled with non-magnetic glass are provided at both ends and the center of the erase gap 7.
is provided. Reference numeral 10 denotes a back core provided over the ends of the common core 2 and the recording/reproducing core 1 where no magnetic gap is provided. A core chip 11 is formed by the recording/reproducing core 1, the common cores 2 and 3, the erase core 5, and the back core 10. Sliders 12 and 13 are provided at both ends of the core chip 11.

Regarding the conventional magnetic head configured as described above, the method for assembling it and the method for measuring the gap depth will be explained in the sixth section below.
This will be explained using figures.

First, a flat first block 14, 15 is joined via resin 16, and a second block 17 is attached to the first block 14.
A third block 18 is attached to the first block 15 through a magnetic gap, a hole 19 is provided from the second block 17 to the first block 14, and a hole is provided from the third block 18 to the first block 15. 20 is provided. A first block 15, a second block 17, and a third block 18 form a block structure. Next, the surface facing the magnetic recording medium is polished in order to eliminate the step difference generated at each joint, and then the gap depth is measured at both ends of the block structure, and the core chip 11 is cut out from the block structure. Next, sliders 12.13 are attached to both ends of the core chip 11, and the sliders 12.1
The distance from the reference surface to the surface of the core chip 11 facing the magnetic recording medium was measured using the surface opposite to the surface facing the magnetic recording medium of either one of No. 3 as a reference surface, and the distance was measured as described above. Subtract the desired gap depth from the gap depth to find the cutting amount of the core tip 11, which is how much the core tip 11 must be removed, and then subtract the cutting amount of the core tip 11 from the value measured after installing the slider 12 and 13 mentioned above. Then, how much the surface facing the magnetic recording medium needs to be shaved is calculated, and the surface facing the magnetic recording medium is mirror-finished by the calculated length.

Problems to be Solved by the Invention However, in the conventional configuration, the measured value of the gap depth measured in the state of the block structure includes a measurement error, and the slider 12° 13 is connected to the core chip 11.
Since the measured value measured after installation on the machine also includes measurement error, the target value is the difference between the two values including the measurement error, and even if the target value is precisely shaved, However, there was a problem in that the gap depth value of the magnetic head after mirror finishing varied considerably.

The present invention solves the above-mentioned conventional problems, and aims to provide a magnetic head with good uniformity of cap depth.

Means for Solving the Problems In order to achieve this object, the magnetic head of the present invention has a nonmagnetic material whose length in the direction perpendicular to the medium facing surface on the gap forming surface of the core on the side that determines the gap depth is non-magnetic. The length in the direction perpendicular to the medium facing surface at the outer end of the surface facing the other slider parts of the slider part joined through the body layer was configured to be equal.

Function: With this configuration, the gap depth can be directly measured at both ends of the magnetic head.

EXAMPLE A magnetic head according to an example of the present invention will be described below with reference to the drawings.

1 and 2 are a plan view and a perspective view showing a magnetic head in an embodiment of the present invention.

In FIGS. 1 and 2, 22 is a core for recording and reproducing,
Slider parts 23 and 24 made of the same material as the core 22 are integrally formed on both sides of the core 22. Non-magnetic glass is injected and they are bonded via a separation layer 25 that does not form a magnetic gap. Further, the length perpendicular to the surface facing the magnetic recording medium is the same as that of the common core 26 (described later) of the core 22.
Since the facing surface facing the slider section 23.24 is configured to be equal to the end of the facing surface facing the slider section 28.29 (described later), the gap depth can be measured on both sides of the magnetic head. . 26 and 27 are common cores, the common core 26 and the common core 27 are joined via the separation layer 25, and the common core 2 is provided on both sides of the common core 26.
Slider parts 28 and 29 made of the same material as 6 are joined via the separation layer 25, and sliders R30 and 31 made of the same material as the common core 27 are connected to both sides of the common core 27 via the separation layer 25. It is joined. 32 is an erase core of 2, and on both sides of the erase score 32 is an erase score of 3.
Slider parts 33 and 34 made of the same material as 2 are joined via a separation layer 25. Further, the length perpendicular to the facing surface facing the magnetic recording medium is equal on the facing surface facing the common core 27 of the erase core 32 and the facing surface facing the slider section 30.31 of the slider section 33.34. It is structured like this. 35 is the core 22 and the common core 26
A read/write gap 36 is provided between the erase core 32 and the common core 27 and is filled with glass. Holes 37 for regulating the width of the read/write gap 35 are provided at both ends of the read/write gap 35, extending from the core 22 to the common core 26, and glass is injected into the holes 37. Further, holes 38 for regulating the erase gap 36 are provided at both ends and the center of the erase gap 36, and glass is injected into the holes 38. Also, the cross section of the joint between the slider portions 23.24 and 28.29 and the slider portion 33.34 and the slider 30.
Since the cross section of the joint 31 is exposed at both ends, the gap depth can be directly measured. Moreover, the recording/reproducing core 22, the common core 26°27
, a separation layer 25 is provided between the erase core 32 and the slider section.
, most of the magnetic flux passes through the portion sandwiched between the separation layers 25. Therefore, the slider section 23 and the slider section 28, the slider section 24 and the slider section 29,
Slider section 30, slider section 33, slider section 3
The magnetic flux is prevented from flowing out at the junction between the slider section 1 and the slider section 34.

The method of assembling this embodiment configured in this way will be explained.

First, as shown in FIG. 3, the first blocks 39 and 40 are joined together through the glass 41, and the second block 42 is attached to the first block 39, and the third block 4 is attached to the first block 40.
A hole 44 is provided from the second block 42 to the first block 39, and a hole 45 is provided from the third block 43 to the first block 40. The first block 39, 40, the second block 42, and the third block 43 form a block structure.

Next, as shown in FIG. 4, separation grooves 46 and 47 are formed perpendicular to the contact surface with the magnetic recording medium and the magnetic gap, and are dug deeper than the gap depth of the block structure. Inject glass into .47. Finally the fifth
A block structure is cut out as indicated by the dotted line in the figure, and the surface facing the magnetic recording medium is mirror-finished to eliminate the step difference at the joint portion of each core. At this time, since the same length as the gap depth is exposed at both ends of the magnetic head, the surface facing the magnetic recording medium can be mirror-finished while directly measuring the gap depth, so the desired gap depth can be achieved. Mirror polishing can be performed to achieve the desired gap depth by adjusting the amount of mirror polishing removed.

As described above, according to this embodiment, the slider parts 23, 24, 28, 29, 3 are respectively connected to the core 22, the common cores 26, 27, and the core 33 by the separation layer 25.
Since it is possible to prevent magnetic flux from leaking towards the 0, 31, 33, and 34 sides, there is no need to perform special processing such as providing a notch at the joint between the slider parts and the slider part before assembling the magnetic head. Since magnetic flux does not jump out from the joint between the slider parts and the slider part, the joint between the slider parts can be made into a pseudo gap having the same structure as the magnetic gap. Therefore, in the manufacturing stage of the magnetic head, a plurality of magnetic heads can be manufactured from a block structure in which rod-shaped cores are joined through a magnetic gap, thereby improving productivity. Further, the length perpendicular to the opposing surface facing the magnetic recording medium of the common core 26 and 27 is the length of the recording/reproducing core 22.
The opposing surface facing the common core 26, which will be described later, is configured to be equal to the opposing surface facing the slider portions 28, 29 of the slider portions 23, 24, and a surface that is perpendicular to the opposing surface facing the magnetic recording medium is configured to be equal. The length is the opposing surface facing the common core 27 of the erase core 32, and the slider portion 33.34.
Since the opposing surfaces facing the slider parts 30 and 31 are configured to be equal, the gap depth can be measured at both ends of the magnetic head while performing mirror finishing, making it possible to have a magnetic head with a constant gap depth. It is possible to produce magnetic heads with

Effects of the Invention The present invention provides that the length of the gap forming surface of a core that determines the gap depth in the direction perpendicular to the medium facing surface is the length of the other slider portion of the slider portion that is bonded to the core through a nonmagnetic layer. By making the length equal to the length in the direction perpendicular to the medium facing surface at the outer end of the facing surface, it is possible to directly measure the gap depth at both ends of the magnetic head. The gap depth can be set to a desired length, and a magnetic head that exhibits constant characteristics can be manufactured. Moreover, since the slider part is joined to the core via a non-magnetic layer, magnetic flux will not leak into the slider part, so before joining the core, a notch can be provided at the joint between the slider parts. Since there is no need for special processing, the joint between the slider parts can have the same structure as the magnetic gap, and multiple magnetic heads can be connected directly from the block structure in which rod-shaped cores are joined via the magnetic gap. can be cut out, improving productivity.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view showing a magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view of the magnetic head, and FIG. FIG. 4 is a perspective view of the block structure, FIG. 5 is a perspective view of the same, FIG. 6 is a plan view of a conventional magnetic head, FIG. 7 is a perspective view of the conventional magnetic head, and FIG. 8 is a conventional magnetic head. FIG. 3 is a partial perspective view showing the block structure before the magnetic head of FIG. 22.32... Core 26.27... Common core 23.24, 28.29, 30, 31, 33.34...
...Slider section 25 ... Separation groove 35 ... Recording/reproduction gap 36 ... Erase gap Name of agent Patent attorney Toshio Nakao and one other person Figure 8

Claims (1)

[Claims] A medium-facing surface on the gap-forming surface of the core, which has two cores whose slider parts are joined through a non-magnetic material and which are joined through a magnetic gap, and the dimensions of the gap-forming surface determine the gap depth. A magnetic head characterized in that the length in the direction perpendicular to the core is equal to the length in the direction at the outer end of the surface of the slider section joined to the core facing the other slider section. .