JPH04362504A - Device and method for composite magnetic head device - Google Patents

Abstract

PURPOSE:To eliminate magnetic mutual interference and the relative shear of a gap by integrating an R/W core block and an erasure core block by sandwiching center core pieces. CONSTITUTION:The R/W core block 49 and the erasure core block 51 are integrated with glass welding by sandwiching the center core pieces 46 and 47, and R/W core track width restriction grooves 52a, 52b, 53a and 53b and erasure core track width restriction grooves 55a, 55b, 56a and 56b are machined on a disk contacting surface. Thus, an R/W core and an erasure core are formed between the grooves, and glass is melted and filled in the both track width restriction grooves 52a, 52b, 53a, 53b, 55a, 55b, 56a and 56b. Then, an insulating member is formed. Thus, a composite magnetic head device in which there is no magnetic mutual interference between the heads and the relative shear of the gap of the heads and which has high performance and superior productivity, and its manufacture method can be provided.

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 device for writing magnetic information on a magnetic recording medium using a plurality of data tracks and reading the written information, and a method for manufacturing the same.

0002

[Background Art] In recent years, FDD (floppy disk drives) have become smaller in size from 8 inches to 5.25 inches to 3.5 inches, and recently, market needs for notebook/book computers have increased. The specific gravity of small 3.5-inch products is rapidly increasing. On the other hand, in terms of capacity, unformatted 1MB, 1.6MB, 2MB (these FDs
The tunnel erase method is widely used in FDDs, and a 4MB FDD with a pre-erase method, which is a higher-end model, is about to be introduced into the market. As software becomes larger and larger with the advancement of the information society, F-ROMs with a capacity more than 10 times that of current models are being introduced.
Demand for DD is becoming stronger. In order to realize such a large capacity FDD with a 3.5-inch size, the servo racking technology used in fixed disk drives has been introduced to increase the track density, as well as the use of high-density media (for example, metal disks) and heads. It is necessary to introduce a (MIG head) to increase the linear recording density. Furthermore, in order to make effective use of conventional software, it is necessary to provide functions that are backward compatible with current models. That is, it is necessary to have the ability to read and write to 4/2/1.6/1 MB disks with the same recording track width. Current higher-end models have this function compared to lower-end models. Against this background, a composite magnetic head device was invented to realize a large capacity FDD.

FIG. 20 shows, for example, Japanese Patent Application Laid-Open No. 63-103408.
1 is a perspective view showing the configuration of a conventional composite magnetic head device of this type disclosed in the above publication. In the figure, 1 is a slider, 2
is the first R/W (read/write) core built into this slider 1, 3 is the first R/W coil wound around this first R/W core 2, and 4 is the first R/W core. R/W core 2
5 is the first R/W head formed by these 2 to 4, 6 is the first R/W gap formed by
/W Second R built into slider 1 together with core 2
/W core, 7 is a second R/W coil wound around this second R/W core 6, 8 is a second R/W gap formed by the second R/W core 6, 9 is a second R/W head composed of these 6 to 8.

Reference numeral 10 denotes a first erase core arranged to erase both ends of a data track on a magnetic disk (not shown) formed by the first R/W gap 4;
11 is a first erase gap formed by this first erase core 10; 12 is a first erase core 1;
The first erase coil 13 is wound around these 1 erase coils.
0 to 12, the first erase head 14 is a magnetic disk formed by the second R/W gap 8 (
15 is a second erase gap formed by this second erase core 14; 16 is a winding around the second erase core 14; The turned second erase coil 17 is a second erase head composed of these 14 to 16.

The track width of both R/W cores 2 and 6 is as follows:
For example, the track width of the first R/W core 2 is larger than that of the second R/W core 2.
/W core 6 has a track width that is wider than the track width of the first R/W head 5 and the first erase head 13. The composite head consisting of the second erase head 17 is formed separately and independently, and then the slider 1
be incorporated and integrated. The composite head with a narrower track width is defined as an upper composite magnetic head, and the composite head with a wider track width is defined as a lower composite magnetic head.

Next, the operation of the conventional composite magnetic head device constructed as described above will be explained. A magnetic head device operates as an electric-magnetic converter or a magnetic-electrical converter when writing or reading information on a magnetic disk. If you use a low-density magnetic disk to write to and read data from its data track, the first track of the lower composite magnetic head with a wide track width
A signal current is passed through the R/W coil 3, and a strong magnetic field is generated near the first R/W gap 4 in accordance with this value, magnetizing the magnetic recording medium on the magnetic disk surface and writing the signal. I do.

[0007] Furthermore, during reading when operating as a magneto-electrical converter, the magnetic flux of the magnetized magnetic recording medium is
When passing near the R/W gap 4 of the first R/W
The voltage induced in the coil 3 is amplified to perform information read processing. On the other hand, when writing to and reading data from a data track using a high-density magnetic disk, use the upper composite magnetic head with a narrow track width, that is, the second R/W head 9 side, in the same manner as above. Process.

[0008]

[Problem to be Solved by the Invention] Since the conventional composite magnetic head device is constructed as described above, the second R/W
An upper composite magnetic head consisting of the head 9 and the second erase head 17 and a lower composite magnetic head consisting of the first R/W head 5 and the first erase head 13 are formed separately, and then the slider 3 is formed. Since it is necessary to form the three parts in an integrated manner, productivity is extremely poor, and magnetic crosstalk occurs due to leakage magnetic flux between the upper composite magnetic head and the lower composite magnetic head.
There was a problem in that relative positional deviations of the gaps 4, 8, 11, and 15 of No. 7 were likely to occur, resulting in deterioration of performance.

The present invention was made to solve the above-mentioned problems, and provides high performance and excellent productivity without mutual magnetic interference between both heads and relative positional deviation of the gap between both heads. An object of the present invention is to provide a composite magnetic head device having the following features and a method for manufacturing the same.

0010

[Means for Solving the Problems] A composite magnetic head device and a method for manufacturing the same according to the present invention integrate a R/W core block and an erase core block with a center core piece in between by glass welding. By cutting R/W core track width regulating grooves and erase core track width regulating grooves on the disk contact surface, a R/W core and an erase core are formed between the grooves, and glass is melted into both of the track width regulating grooves. A shielding member is formed by filling.

[0011]

[Operation] In the composite magnetic head device of the present invention and its manufacturing method, R/W core track width regulating grooves and erase core track width regulating grooves are formed on the integrated R/W core block and erase core block. The R/W core and erase core are already integrated at the time of formation, so productivity is high. prevent leakage of magnetic flux.

0012

[Example] Example 1. Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a perspective view showing the configuration of main parts of a composite magnetic head device according to a first embodiment of the present invention. In the figure, 18, 19,
20, 21 are R/W core legs that constitute the lower composite head 40 with a wide track width, center core legs for the R/W core,
The erase core leg and the center core leg for the erase core are made of metal oxides such as Mn-Zn ferrite and Ni-Zn.
It is made of a highly hard iron-based metallic magnetic material with ferrite and ultra-fine supersaturated crystal phases precipitated. 22, 23, 24
, 25 are made of the same members as 18, 19, 20, and 21, respectively, and constitute the upper composite head 50 with a narrow track width.
/W core leg, center core leg for R/W core, erase core leg, and center core leg for erase core.

26 and 27 are sliders made of the same material as 18 to 25; 28 is a magnetic shield made of the same material as 18 to 27; 29, 30, 31, and 32 are provided between the slider 26 and the lower composite head 40; A non-magnetic filling member 33 made of glass or the like is filled between the lower composite head 40 and the magnetic shield 28, between the magnetic shield 28 and the upper composite head 50, and between the upper composite head 50 and the slider 27. This center spacer is provided to magnetically separate each R/W core 22, 18 and each erase core 24, 20 of the lower composite head 40, and is made of a non-magnetic material such as glass ceramic.

Reference numerals 34, 35, 36, and 37 are the R/W gap and erase gap of the upper composite head 50, and the R/W gap and erase gap of the lower composite head 40, which are formed by thin film forming techniques such as sputtering and vapor deposition. It is made of a non-magnetic material such as SiO2 or Ta2O. 38 and 39 are R/W cores 1 of both composite heads 40 and 50
In order to generate a strong magnetic field in the upper part of the magnetic disk facing side of each gap 36, 34 of 8, 22, both R
/W The magnetic film formed between the core legs 18, 22 and both gaps 34, 36 has a high saturation magnetic flux density such as sendust (Fe-Si-Al) amorphous alloy (e.g. Co-Zy-Nb). It is made of a magnetic member with 41a and 41b are grooves around which the R/W coil (not shown) of the lower composite head 40 is wound, and 42a and 42b are the R/W coils of the upper composite head 50.
Groove portions 43a, 43 around which the W coil (not shown) is wound
b is an erase coil (not shown) of the lower composite head 40
is the groove in which it is wound. In this embodiment, the erase coil of the upper composite head 50 is not used.

Next, a method of manufacturing the composite magnetic head device constructed as described above will be explained. 4 in Figure 2
4 and 45 are the upper composite head 50 and the lower composite head 4
0 for the R/W core section and the erase core section, 46 and 47 in FIG. 3 are both composite heads 50,
Each of these pieces 44 to 47 is finished to predetermined dimensions by grinding and lapping, and especially the gap surface is finished to a mirror surface without processing distortion. Each of these pieces 44 to 47 also serves as a component of the sliders 26, 27 and the magnetic shield 28.

Next, winding window preliminary grooves 44a, 45a and mold glass placing grooves 44b, 45b are machined on the ferrite pieces 44, 45 for the R/W core section and the erase core section, as shown in FIG. 4-(A). give After this processing is completed, as shown in FIG. 4-(B), magnetic films 38 and 39 are formed by sputtering in the vicinity of the gap (indicated by hatching in the figure) of the ferrite piece 44 for the R/W core part. . After that, although not shown in the figure, the ferrite piece 44 for the R/W core section and the erase core section,
45 and ferrite pieces 46 and 47 for the center core
A gap member is formed by sputtering on the surfaces of the sides that come into contact with each other. In this case, the gap members are ferrite pieces 46, 47 for the center core.
It may be formed only on the side surface.

After forming the gap member, as shown in FIG. 5-(A), the ferrite piece 44 for the R/W core section and the ferrite piece 46 for the center core section, and the ferrite piece 45 for the erase core section and the center The ferrite pieces 47 for the core portion are fixed in contact with each other so as to sandwich the gap member between them, and each glass placement groove 44b, 4
A glass rod 48 is placed on the R/W core block 49 and erased core block 5 by heating it and welding it into one piece.
1 is configured.

Next, among both core blocks 49 and 51,
As for the R/W core block 49, as shown in FIG. 53a and 53b, for example, by grinding using a diamond wheel, diagonally from the disk contact surface 49a (sliding surface) toward the center core surface and deeper than the lower end of the gap where the core halves join. administered. In addition, in FIG. 5-(B), each track width regulating groove 52a, 52b, 53a for one head is
, 53b, but in reality they are longer than the R/W core block 49 from the viewpoint of mass production, and the number of grooves will be larger than this because a plurality of heads will be processed and divided at the same time.

After completing the track width regulating groove machining of this R/W core, the R/W core block 49 and the erase core block 51 are assembled so as to sandwich the ferrite pieces 46 and 47 for the center core portion, as shown in FIG. The core blocks 49 and 51 are arranged at intervals corresponding to the thickness of the center spacer 33, a non-magnetic ceramic spacer (not shown) is interposed in a part of this gap, and a load is applied between both core blocks 49 and 51 to open the gap. A glass rod 54 is placed above the gap to raise the temperature, and the gap and each track width regulating groove 5 are heated.
2a, 52b, 53a, and 53b are melted and filled with glass.

Next, as shown in FIG.
The track width regulating grooves 55a, 55b of the erase core of No. 0 and the track width regulating grooves 56a, 56b of the erase core of the upper composite head 50 are polished from the disk facing surface 49a side by grinding using, for example, a diamond wheel. The track width regulating grooves 52a, 52b, 53a, and 53b of the R/W core are parallel to each other and include part of the widthwise outer sides thereof. Note that the depth of the groove is limited to a level that does not cut both core blocks 49 and 51, as shown in the figure. Further, the track width regulating grooves 55a and 56b function as a separating groove from the sliders 26 and 27, and the track width regulating grooves 55b and 56a function as a separating groove from the magnetic shield 28, respectively.

After finishing the track width regulating grooves on the erase core, a glass rod 57 is placed on the disk contacting surface 49a of the core block 49 as shown in FIG. melt and fill the glass. In this work process, if the glass rod 57 is also inserted into the winding window preliminary grooves 44a, 45a, each groove 55a,
Glass can be filled to the depths of 55b, 56a, and 56b. When filling the glass, a welding jig is used to prevent the gap from opening, and a load is applied to the side surface through a partition plate made of mica or the like to prevent excess glass from flowing out, and each groove 55a, 55b is filled as shown in FIG. , 56a and 56b are filled with glass to complete the block.

After this process, as shown in FIG. 10, processing using a diamond wheel, for example, penetrates a portion of the glass filled in each groove 55a, 55b, 56a, 56b in a direction perpendicular to the disk contact surface. grooves 41a, 41b around which the R/W coil of the lower composite head 40 is wound; grooves 42a, 41b around which the R/W coil of the upper composite head 50 is wound;
42b and grooves 43a and 43b around which the erase coil of the lower composite head 40 is wound are formed, respectively. Finally, as shown in FIG. 11, when the portion shown by the dashed line is cut, that is, the lower part of the core block is cut and the winding grooves are processed, the main parts of the composite magnetic head device as shown in FIG. 1 are constructed. Although not shown in the figure, if an air groove is machined on the disk contacting surface to improve head contact, and each coil is wound around the core leg and a shunt magnetic material is connected to the bottom of the leg. , a composite magnetic head device in which an upper head, a lower head, a magnetic shield, and a slider are integrally formed is completed.

Example 2. In the first embodiment described above, a case has been described in which ferrite, a metal oxide with a low saturation magnetic flux density, is used for the head core member and magnetic films 39 and 38 are formed on one side of the R/W gaps 34 and 36. They may also be formed on both sides of the W gaps 34 and 36 or on the erase gaps 35 and 37 side. Furthermore, by using an iron-based alloy with high hardness and high saturation magnetic flux density in which ultra-fine supersaturated crystal phases are precipitated for the head core material, a magnetic film can be omitted, resulting in a head with excellent wear resistance and recording ability. be done.

Example 3. In the above Example 1, the case where the same type of glass was used for each of the glass rods 48, 54, and 57 used in the three glass molding steps was explained, but by making the melting temperature slightly different, If you sequentially use glasses that have a melting temperature that does not melt the glass in the glass molding process,
Eliminates the need to apply loads between cores to prevent gaps from opening.

Example 4. In the first embodiment, the case where the center spacer 33 is formed of molded glass has been described, but non-magnetic ceramic such as calcium titanate or barium titanate may be used. In this case, both sides of the ceramic plate may be formed. Glass is previously formed by vapor deposition or sputtering on the center core surface to be joined to the cage plate.

Example 5. FIG. 12 shows a composite head without a slider section, consisting of a lower composite head 40 of advance erasing type and an upper composite head 50 of self-overwriting type with a single cap.
A floppy disk device having a configuration in which a magnetic shield 28 is provided between 0 and 50, and a non-magnetic glass material 58 is filled on the disk facing side of the erase head core of the upper composite head 50, and both sides of the disk are used for data recording. It aims to reduce magnetic interference between two composite heads placed on both sides of a disk.

Example 6. FIG. 13 shows a composite head and a slider in which both the lower and upper composite heads are of the advance erasing type. What is different from that of Embodiment 1, the finished product of which is shown in FIG. Groove 59a around which the coil is wound
, 59b are provided.

Example 7. In FIG. 14, a tunnel erase type composite head is employed as the lower composite head 40, and the upper composite head 50 is constructed of only a single-gap R/W core as in the first embodiment.

Example 8. In FIG. 15, both the lower and upper composite heads 40 and 50 are constructed of tunnel erase type composite heads.

Example 9. In FIG. 16, there is no slider section, and both the lower and upper composite heads 40 and 50 are constructed of advance erasure type composite heads.

Example 10. In FIG. 17, there is no slider part, the lower composite head 40 is a advance erasure type composite head, and the upper composite head 50 is a composite head that uses only a single gap R/W core. Center core leg 23 for W core
The lower molded glass is removed, and the R/W coil (not shown) for the upper composite head 50 is wound around the center core leg 23 for the R/W core, resulting in lower inductance and higher efficiency of the upper composite head core. The aim is to

Example 11. FIG. 18 shows the R/W of the lower and upper composite heads 40 and 50.
In order to increase the core efficiency of the head, the glass in the center core part is eliminated, and the lower composite head 40 is constructed of a advance erasure type composite head, and the upper head 50 is constructed of a single gap R/W head.

Example 12. FIG. 19 shows the R/W of the lower and upper composite heads 40 and 50.
In order to increase the core efficiency of the head, the center core legs 19, 21, 23, 25 of the R/W head and erase head
The lower composite head 40 is a advance erasing type composite head, and the upper composite head 50 is a single gap R/W head.

[0034]

[Effects of the Invention] As described above, according to this invention, R/W
By integrating the core block and erase core block with a center core piece in between by glass welding, and cutting R/W core track width regulating grooves and erase core track width regulating grooves on the disc facing surfaces of both core blocks, A R/W core and an erase core are formed between the grooves, and a shielding member is formed by melting and filling the track width regulating grooves with glass, thereby preventing mutual magnetic interference between both heads and the gap between both heads. It is possible to provide a composite magnetic head device and a method for manufacturing the same, which have no relative positional deviation, high performance, and excellent productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of main parts of a composite magnetic head device according to a first embodiment of the present invention.

[Figure 2] R/ of the lower and upper composite heads in Figure 1;
It is a perspective view showing a ferrite piece for a W core part and an erase core part.

FIG. 3 is a perspective view showing a ferrite piece for the center core of the lower and upper composite heads in FIG. 1;

FIG. 4 shows the process of processing the ferrite pieces for the R/W core part and the erase core part in FIG. 2,
(A) is a perspective view showing a device provided with a winding window preliminary groove and a mold glass placing groove, and (B) a perspective view showing a device provided with a magnetic film.

FIG. 5 shows the process of forming a R/W core block and an erase core block, in which (A) is a perspective view showing the process of welding the ferrite piece for the core part and the ferrite piece for the center core with glass, and (B) ) is a perspective view showing a state in which R/W core track width regulating grooves are formed in the R/W core block.

FIG. 6 is a perspective view showing the process of welding the R/W core block and the erase core block with glass.

FIG. 7 is a perspective view showing the process of forming erase core track width regulating grooves in a R/W core block and an erase core block that are welded together with glass.

8 is a perspective view showing a process of melting and filling the track width regulating grooves formed in FIG. 7 with glass; FIG.

FIG. 9 is a perspective view showing a state in which the track width regulating groove is filled with glass.

10 is a perspective view showing a state in which grooves for winding a R/W coil and an erase coil are formed in the block completed in FIG. 9; FIG.

11 is a perspective view showing a state in which the main part of the composite magnetic head device shown in FIG. 1 is completed, with the lower part of the core block cut and the winding grooves processed; FIG.

FIG. 12 is a perspective view showing the configuration of main parts of a composite magnetic head device according to a fifth embodiment of the present invention.

FIG. 13 is a perspective view showing the configuration of essential parts of a composite magnetic head device according to a sixth embodiment of the present invention.

FIG. 14 is a perspective view showing the configuration of main parts of a composite magnetic head device according to a seventh embodiment of the present invention.

FIG. 15 is a perspective view showing the configuration of essential parts of a composite magnetic head device in Example 8 of the present invention.

FIG. 16 is a perspective view showing the configuration of a main part of a composite magnetic head device according to a ninth embodiment of the present invention.

FIG. 17 is a perspective view showing the configuration of main parts of a composite magnetic head device in Example 10 of the present invention.

FIG. 18 is a perspective view showing the configuration of main parts of a composite magnetic head device in Example 11 of the present invention.

FIG. 19 is a perspective view showing the configuration of main parts of a composite magnetic head device according to a twelfth embodiment of the present invention.

FIG. 20 is a perspective view showing the configuration of a conventional composite magnetic head device.

[Explanation of symbols]

18, 22 R/W core legs 19, 23 Center core legs for R/W core 20, 24
Erase core legs 21, 25 Center core legs for erase core 26, 2
7 Slider 28 Magnetic shield 33 Center spacer 40 Lower composite heads 41a, 41b R/W coil winding grooves 42a, 42b of lower composite head R/W coil winding grooves 43a, 43b of upper composite head Erase coil winding of lower composite head Circular groove 44 R/W core part ferrite piece 44a Winding window preliminary groove 45 Erase core part ferrite piece 4
5a Winding window preliminary groove 46 Center core piece 47
Center core piece 48 Glass rod 49 as the first glass R/W core block 50 Upper composite head 51 Erase core block 52a, 52
b, 53a, 53b R/W core track width regulating groove 54 Glass rod 55 as second glass
a, 55b, 56a, 56b Erase core track width regulating groove 57 Glass rod as third glass

Claims (3)

[Claims] 1. A step of forming winding window preliminary grooves in the R/W core ferrite piece and the erased core ferrite piece, respectively, and forming the R/W core ferrite piece, the erased core ferrite piece, and a center paired therewith. a step of forming a gap member by sputtering on at least one of the surfaces facing the core piece;
melting and integrating the core ferrite piece, the center core piece, the erased core ferrite piece, and the center core piece using a first glass to form a R/W core block and an erased core block; forming track width regulating grooves for the R/W core of the lower composite head and track width regulating grooves for the R/W core of the upper composite head in the /W core block, and positioning the center core piece sides of both core blocks in a predetermined manner. A second
a step of melting and filling the glass into one piece, and forming track width regulating grooves for the erase core in both core blocks, including a part of the outer side in the width direction of the track width regulating grooves of both the R/W cores, and parallel to each other. a step of melting and filling a third glass into both the track width regulating grooves; and a step of perpendicularly penetrating a portion of the third glass filled in the track width regulating grooves of the erase core from the disk facing surface. forming grooves for inserting the R/W coil and erase coil of the lower composite head and the R/W coil of the upper composite head; and cutting the lower portions of the R/W core block and the erase core block. and shaping the winding window preliminary groove to form a winding window. Claim 2: Each glass has a melting temperature of the first glass>
2. The method of manufacturing a composite magnetic head device according to claim 1, wherein the relationship is that second glass>third glass. 3. A R/W core block and an erase core block which are welded and integrated with glass with the center core piece sides facing each other, and a disk-facing surface of the R/W core block that traverses the center core piece and has a predetermined shape. The R/W core is formed between the R/W core track width regulating grooves that are cut to a width and depth of The erase core track width regulating groove is formed on the erase core block by an erase core track width regulating groove that is cut parallel to the disk contact surface to a predetermined width and depth.
/W A composite magnetic head device comprising an erase core formed coaxially with the core, and a shielding member formed of glass filled in both the track width regulating grooves.