JP2745859B2 - Composite magnetic head device and method of manufacturing the same - Google Patents

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 by a plurality of data tracks and reading the written information, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, floppy disk drives (FDDs) have been reduced in size from 8 inches to 5.25 inches to 3.5 inches in size, and the needs of the market for notebook / book type personal computers and the like have recently increased. The specific gravity of 3.5 inches is rapidly increasing. On the other hand, in terms of capacity, unformatted 1MB, 1.6MB, and 2MB (the tunnel erase method is adopted for these FDDs) are widely used, and 4MB of the preceding model, which is a higher-order model, is also used. FDD is on the market. As software grows larger with the development of the information society,
The demand for large capacity FDD more than 10 times is increasing. In order to realize such a large capacity FDD with a 3.5-inch size, the track density is increased by introducing the servo racking technology adopted for the fixed disk device, and a medium for high recording density (for example, a metal disk) and a head (MI
G head) to increase the linear recording density. Furthermore, in order to effectively use the conventional software, it is necessary to provide a function of backward compatibility with the current model. That is, a function of reading and writing to 4/2 / 1.6 / 1MB disks having the same recording track width is required. The current upper model has this function for the lower model. Against this background, a composite magnetic head device was created to realize large-capacity FDD.

FIG. 20 is a perspective view showing the structure of a conventional composite magnetic head device of this kind disclosed in, for example, JP-A-63-103408. In the drawing, 1 is a slider, 2 is a first R / W (read / write) core incorporated in the slider 1, and 3 is a first R / W core wound around the first R / W core 2.
R / W coil, 4 is a first R / W gap formed by the first R / W core 2, 5 is a first R / W head composed of these 2 to 4, and 6 is the first R / W head. A second R / W core incorporated in the slider 1 together with the R / W core 2 of the first embodiment, 7 is a second R / W coil wound around the second R / W core 6, and 8 is a second R / W coil. A second R / W gap 9 formed by the R / W core 6 is a second R / W head composed of these 6-8.

[0004] 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, and 11 denotes the first erase core. A first erase gap formed by 10, 12 is a first erase coil wound around the first erase core 10, 13 is a first erase head composed of 10 to 12, and 14 is a second erase head. A second erase core 15 arranged to erase both ends of a data track on a magnetic disk (not shown) formed by the R / W gap 8 is formed by the second erase core 14. Erase gap, 16 is the second erase core
The second erase coil wound around 14, 17
This is the second erase head composed of 16 bits.

The track widths of the two R / W cores 2 and 6 are different, for example, such that the track width of the first R / W core 2 is wider than the track width of the second R / W core 6. The first R / W head 5 and the first erase head 13 are formed.
And a composite head composed of the second R / W head 9 and the second erase head 17 are formed separately and independently, and then incorporated into the slider 1 and integrated. The composite head with the smaller track width is defined as the upper composite magnetic head, and the composite head with the wider track width is defined as the lower composite magnetic head.

Next, the operation of the conventional composite magnetic head device configured as described above will be described. The magnetic head device operates as an electro-magnetic converter or a magnetic-electric converter when writing or reading information on a magnetic disk. If data is written to and read from a data track using a low-density magnetic disk, the first lower magnetic head having a wider track width may be used.
A signal current is passed through the R / W coil 3 to generate a strong magnetic field in the vicinity of the first R / W gap 4 corresponding to this value, and magnetize the magnetic recording medium on the magnetic disk surface to write the signal. I do.

At the time of reading which operates as a magneto-electric converter, the magnetic flux of the magnetized magnetic recording medium becomes the first magnetic flux.
When passing through the vicinity of the R / W gap 4, the voltage induced in the first R / W coil 3 is amplified to perform information reading processing. On the other hand, when writing and reading to and from the data track using a high-density magnetic disk, the upper composite magnetic head having a narrow track width, that is,
The same processing as described above is performed using the second R / W head 9 side.

[0008]

Since the conventional composite magnetic head device is constructed as described above, the upper composite magnetic head comprising the second R / W head 9 and the second erase head 17 and the Since it is necessary to separately form a lower composite magnetic head including the first R / W head 5 and the first erase head 13 and then integrally form the slider 3 into three parts, the productivity is extremely low. , Magnetic crosstalk occurs due to magnetic flux leakage between the upper composite magnetic head and the lower composite magnetic head, and the relative displacement of the gaps 4, 8, 11, 15 of the heads 5, 9, 13, 17 is likely to occur. And the performance is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has high performance and excellent productivity without magnetic mutual interference between the two heads and relative displacement of the gap between the two heads. It is an object of the present invention to provide a composite magnetic head device having the above and a manufacturing method thereof.

[0010]

According to the present invention, there is provided a composite magnetic head device and a method of manufacturing the same, wherein an R / W core block and an erase core block are integrated by glass welding with a center core piece interposed therebetween, and both core blocks are integrated. by cutting the R / W core track width regulating grooves and erase core track width regulating grooves on the disc abutment surface, the upper between the groove
The shielding member is formed by forming each R / W core and the erasing core of the lower and upper composite heads and melting and filling glass in each of the track width regulating grooves.

[0011]

The R / W core track width regulating groove and the erase core track width regulating groove are formed on the integrated R / W core block and erase core block of the composite magnetic head device and the method of manufacturing the same according to the present invention. Was
Each R / W core and erase core of the upper and lower composite heads are already integrated at the time of formation, so productivity is good,
A shielding member formed of glass melt-filled in each track width regulating groove prevents leakage of magnetic flux between the upper composite head and the lower composite head.

[0012]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a main part of a composite magnetic head device according to Embodiment 1 of the present invention. In the figure, 18, 19, 20, 21,
Are the R / W core legs, the center core legs for the R / W core, the erase core legs, and the center core legs for the erase core that constitute the lower composite head 40 having a wide track width, and are metal oxides.
It is made of Mn-Zn ferrite, Ni-Zn ferrite, or a high-hardness iron-based metal magnetic material in which an ultrafine supersaturated crystal phase is precipitated. 22, 23, 24, and 25 are the same members as 18, 19, 20, and 21, respectively, and constitute the upper composite head 50 having a narrow track width.
These are the core leg, the center core leg for the R / W core, the erase core leg, and the center core leg for the erase core.

Reference numerals 26 and 27 denote sliders made of the same member as 18 to 25, 28 a magnetic shield similarly made of 18 to 27, 2
9, 30, 31, and 32 are slider 26 and lower composite head 40, respectively.
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.
Filled in between, for example, a non-magnetic filling member made of glass or the like, 33 is each of the upper composite head 50 and the lower composite head 40
A center spacer provided for magnetically separating the R / W cores 22 and 18 from the erase cores 24 and 20 and made of a non-magnetic material such as glass ceramic.

Reference numerals 34, 35, 36, and 37 denote the R / W gap and erase gap of the upper composite head 50, and the R / W of the lower composite head 40.
Sputtering, with gap and erase gap
S _i O ₂ which is formed by thin-film forming technique such as vapor deposition, T _a2 O
And the like. 38, 39 are both composite heads 40,
In order to generate a strong magnetic field above the magnetic disk facing surface of each of the gaps 36, 34 of the 50 R / W cores 18, 22, both R / W core legs are formed by thin-film forming techniques such as sputtering and ion plating. A magnetic film formed between the gaps 18, 22 and the gaps 34, 36, and is a sendust (Fe-Si-Al) amorphous alloy (for example,
It is a magnetic member having a high saturation magnetic flux density such as Co-Zy-Nb). 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 upper composite heads 50.
A groove portion around which an R / W coil (not shown) is wound, and 43a and 43b are groove portions around which an erase coil (not shown) of the lower composite head 40 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 configured as described above will be described. 4 in FIG.
4,45 is R / W of upper composite head 50 and lower composite head 40
Ferrite pieces for the core part and the erase core part. Reference numerals 46 and 47 in FIG. 3 denote ferrite pieces for the center core of the composite heads 50 and 40.
Is finished to a predetermined size by grinding and lapping, and in particular, the surface serving as a gap surface is finished to a mirror surface without processing distortion. Each of the pieces 44 to 47 also serves as a component of the sliders 26 and 27 and the magnetic shield 28.

Next, as shown in FIG. 4A, winding window spare grooves 44a, 45a and mold glass placing grooves 44b, 45b are provided in the ferrite pieces 44, 45 for the R / W core portion and the erase core portion.
The processing of. After this processing, as shown in FIG. 4B, magnetic films 38 and 39 are formed by sputtering in the vicinity of the gap (shown by hatching) in the ferrite piece 44 for the R / W core. . Then, although not shown in the figure, a gap member is provided on the surface on the side where the ferrite pieces 44, 45 for the R / W core portion and the erase core portion and the ferrite pieces 46, 47 for the center core are respectively in contact. Is formed by sputtering. In this case, the gap member is a ferrite piece for the center core.
It may be formed only on the surface on the 46, 47 side.

After the formation of the gap member, the ferrite piece 44 for the R / W core and the ferrite piece 46 for the center core, and the ferrite piece 45 for the erase core and the center, as shown in FIG. The ferrite piece 47 for the core part is fixed by abutting each other so as to sandwich the gap member, and the glass rod 48 is placed in each of the glass placing grooves 44b, 45b, and the temperature is raised and welded and integrated. A W core block 49 and an erase core block 51 are configured.

Next, as shown in FIG. 5B, the R / W core block 49 of the two core blocks 49, 51 has the track width regulating grooves 52a, 52b of the R / W core of the lower composite head 40. And the track width regulating grooves 53a, 53b of the R / W core of the upper composite head 50, by grinding using, for example, a diamond wheel, from the disk contact surface 49a (sliding surface) toward the center core surface and the core half. It is applied diagonally so as to be deeper than the lower end of the gap where the bodies join. In FIG. 5B, each track width regulating groove 52a, 52b, 53a,
Although 53b is formed, it is actually longer than the R / W core block 49 from the viewpoint of mass productivity, and a plurality of heads are simultaneously processed and divided, so that the number of grooves is increased.

After the track width restricting groove processing of the R / W core is completed, the R / W core block 49 and the erase core block 5
As shown in FIG. 6, the ferrite pieces 46 and 47 for the center core are interposed therebetween and at intervals corresponding to the thickness of the center spacer 33, and a non-magnetic ceramic spacer (not shown) is partially provided in this gap. ) Is interposed and a load is applied between the core blocks 49 and 51 to prevent the gap from opening. A glass rod 54 is placed above the gap to raise the temperature, and the gap and each track width regulating groove 52a, 52b are increased. , 53a, 53b are melt-filled with glass.

Next, as shown in FIG.
The track width regulating grooves 55a, 55b of the erase core of the above and the track width regulating grooves 56a, 56 of the erase core of the upper composite head 50
b, for example, by grinding using a diamond wheel, from the disk contact surface 49a side toward the lower side of both core blocks 49, 51, the track width regulating grooves 52a, 52b, 53a, 5 of the R / W core.
3b is applied in parallel, including a part outside in the width direction. The depth of the groove is limited to such a degree that the core blocks 49 and 51 are not cut as shown in the figure. Also, the track width regulating grooves 55a, 56b serve as separation grooves from the sliders 26, 27, and are used as the track width regulating grooves 55b, 5b.
6a has a function as a separation groove with the magnetic shield 28, respectively.

After the processing of the track width regulating groove of the erase core is completed, a glass rod 57 is placed on the disk contact surface 49a of the core block 49 as shown in FIG.
5b, 56a, and 56b are melt-filled with glass. In this work process,
If the glass rod 57 is also inserted into the winding window spare grooves 44a, 45a, the glass can be filled to the deep portions of the grooves 55a, 55b, 56a, 56b. At the time of filling the glass, a load is applied to the side surface through a partition plate such as mica using a welding jig so as not to cause a gap opening and not to allow excess glass to flow out, and as shown in FIG. 9, each groove 55a, 55b , 56a and 56b are completed with blocks filled with glass.

After this step, as shown in FIG. 10, processing using, for example, a diamond wheel penetrates a part of the glass filled in each groove 55a, 55b, 56a, 56b in a direction perpendicular to the disk contact surface. The grooves 41a and 41b for winding the R / W coil of the lower composite head 40 are wound around the grooves 42a and 42b for winding the R / W coil of the upper composite head 50 and the erase coil of the lower composite head 40. Grooves 43a and 43b are respectively formed. And finally, as shown in FIG.
That is, when the lower cutting of the core block and the processing of the winding groove are performed, the main part of the composite magnetic head device as shown in FIG. 1 is formed, and although not shown in FIG. Apply air groove processing to improve head contact, further wind each coil around the core leg and connect the magnetic material for shunt to the lower part of the leg, upper head, lower head,
A composite magnetic head device in which the magnetic shield and the slider are integrally formed is completed.

Embodiment 2 FIG. In the first embodiment, a ferrite of a metal oxide having a low saturation magnetic flux density is used for the head core member, and an R / W gap of 3 is used.
Although the case where the magnetic films 39 and 38 are formed on one side of the gaps 4 and 36 has been described, the magnetic films 39 and 38 may be formed on both sides of the R / W gaps 34 and 36 or on the erase gaps 35 and 37 side. Furthermore, the use of a high-hardness, high-saturation magnetic flux density iron-based alloy with a superfine supersaturated crystal phase precipitated on the head core member eliminates the need for a magnetic film, realizing a head with excellent wear resistance and recording capability. Is done.

Embodiment 3 FIG. In the first embodiment, the case where the same type of glass is used for each of the glass rods 48, 54, and 57 used in the three glass molding steps has been described. If glass having a melting temperature that does not melt the glass in the glass molding step is sequentially used, the trouble of applying a load between the cores to prevent a gap from opening can be eliminated.

Embodiment 4 FIG. In the first embodiment, the case where the center spacer 33 is formed of molded glass has been described. However, a nonmagnetic ceramic such as calcium titanate or barium titanate may be used. Glass is previously formed by vapor deposition or sputtering on the center core surface to be joined to the plate.

Embodiment 5 FIG. FIG. 12 shows a composite head without a slider portion, which comprises a lower erasing head 40 of a preceding erase type and an upper composite head 50 of a single cap of a self-overwriting type, and a magnetic shield 28 is provided between the two composite heads 40 and 50. And a non-magnetic glass material on the side of the erase head core of the upper composite head 50 facing the disk.
58 is intended to be applied to a floppy disk drive using both sides of a disk for data recording, with the aim of reducing magnetic interference between two composite heads arranged on both sides of the disk.

Embodiment 6 FIG. FIG. 13 shows a composite head and a slider in which both the lower and upper composite heads are composed of a preceding erasure type composite head, which is different from that of the embodiment 1 shown in FIG. The point is that grooves 59a and 59b for winding coils are provided.

Embodiment 7 FIG. FIG. 14 shows a configuration in which a tunnel erase type composite head is employed as the lower composite head 40, and the upper composite head 50 comprises only a single gap R / W core as in the first embodiment.

Embodiment 8 FIG. FIG. 15 shows that the lower and upper composite heads 40 and 50 are both composed of a tunnel erase type composite head.

Embodiment 9 FIG. FIG. 16 shows a lower and upper composite head 4 without a slider section.
Both 0 and 50 are composed of preceding erasure type composite heads.

Embodiment 10 FIG. FIG. 17 shows that there is no slider portion, the lower composite head 40 is a preceding erase type composite head, and the upper composite head 50 has a single gap.
It consists of a composite head that uses only the R / W core and removes the mold glass below the center core leg 23 for the R / W core of the upper composite head 50. An R / W coil (not shown) for 50 is wound to reduce the inductance and increase the efficiency of the upper composite head core.

Embodiment 11 FIG. FIG. 18 shows that, in order to increase the core efficiency of the R / W head of the lower and upper composite heads 40 and 50, the glass of the center core portion is eliminated, and the lower composite head 40 is a preceding erase type composite head.
The upper head 50 is a single gap R / W head.

Embodiment 12 FIG. FIG. 19 shows that the center core legs 19, 21, 23, and 25 of the R / W head and the erase head are identical to increase the core efficiency of the R / W head of the lower and upper composite heads 40 and 50, and the lower composite head Numeral 40 designates a composite head of a preceding erasure type, and an upper composite head 50 comprises a single gap R / W head.

[0034]

As described above, according to the present invention, the R / W core block and the erase core block are integrated by glass welding with the center core piece interposed therebetween, and the R / W by cutting the core track width regulating grooves and erase core track width regulating groove to melt filled with glass to each track width regulating groove and forming upper, each R / W core and Irezukoa lower composite head between the grooves A magnetic member between the two heads and a relative displacement of the gap between the two heads, and a high-performance and high-productivity composite magnetic head device and its manufacture. A method can be provided.

[Brief description of the drawings]

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

FIG. 2 shows the R / W of the lower and upper composite heads in FIG.
It is a perspective view which shows a ferrite piece for core parts and an erase core part.

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

FIG. 4 shows a step of processing the ferrite piece for the R / W core and the erase core in FIG. 2;
(A) is a perspective view showing a case where a winding window preliminary groove and a mold glass placing groove are formed, and (B) is a perspective view showing a case where a magnetic film is formed.

FIG. 5 is a perspective view showing a process of forming an R / W core block and an erase core block, and FIG. 5 (A) is a perspective view showing a process of welding a ferrite piece for a core portion and a ferrite piece for a center core with glass; ) Indicates R / W in R / W core block
FIG. 4 is a perspective view showing a state where a track width regulating groove of a W core is formed.

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

FIG. 7 is a perspective view showing a process of forming a track width regulating groove of the erase core in the R / W core block and the erase core block which are welded and integrated with glass.

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

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

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

FIG. 11 is a perspective view showing a state where the lower portion of the core block has been cut and the winding grooves have been processed to complete the main part of the composite magnetic head device in FIG. 1;

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

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

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

FIG. 15 is a perspective view showing a configuration of a main part of a composite magnetic head device according to an eighth embodiment of the present invention.

FIG. 16 is a perspective view showing a 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 a configuration of a main part of a composite magnetic head device according to Embodiment 10 of the present invention.

FIG. 18 is a perspective view showing a configuration of a main part of a composite magnetic head device according to Embodiment 11 of the present invention.

FIG. 19 is a perspective view showing a configuration of a main part of a composite magnetic head device according to Embodiment 12 of the present invention.

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

[Explanation of symbols]

 18,22 R / W core leg 19,23 Center core leg for R / W core 20,24 Erase core leg 21,25 Center core leg for erase core 26,27 Slider 28 Magnetic shield 33 Center spacer 40 Lower composite head 41a, 41b Lower R / W coil winding groove of composite head 42a, 42b R / W coil winding groove of upper composite head 43a, 43b Erase coil winding groove of lower composite head 44 R / W core ferrite piece 44a Spare winding window 45 Erase core part ferrite piece 45a Winding window spare groove 46 Center core piece 47 Center core piece 48 Glass rod as first glass 49 R / W core block 50 Upper composite head 51 Erase core block 52a, 52b, 53a, 53b R Track width regulating groove of / W core 54 Glass rod as second glass 55a, 55b, 56a, 56b Track width regulating groove of erase core 57 Glass rod as third glass

Claims (3)

(57) [Claims] A step of forming a winding window spare groove in each of the R / W core ferrite piece and the erase core ferrite piece; and a center paired with the R / W core ferrite piece and the erase core ferrite piece. A step of forming a gap member by sputtering on at least one of the opposing surfaces of the core piece, and the R / W core part ferrite piece, the center core piece, and the erase core part ferrite piece to sandwich the gap member, respectively. The center core pieces are melted and integrated using the first glass, respectively, and R / W
A step of forming a core block and an erase core block, and a step of forming a track width regulating groove of the R / W core of the lower composite head and a track width regulating groove of the R / W core of the upper composite head in the R / W core block. A step of opposing the center core pieces of the two core blocks through a gap having a predetermined interval, and melting and filling the gap with a second glass to integrate the two glasses;
Forming a track width regulating groove of the erase core including a part of the track width regulating groove of the R / W core on the outside in the width direction, and melting and filling a third glass into the both track width regulating grooves; A part of the third glass filled in the track width regulating groove of the erase core penetrates vertically from the disk contact surface, and the R / W coil and erase coil of the lower composite head and the R / W coil of the upper composite head. Forming a groove for inserting a W coil, and forming a winding window by cutting the lower part of the R / W core block and the erase core block to shape the winding window preliminary groove. A method of manufacturing a composite magnetic head device. 2. The method of manufacturing a composite magnetic head device according to claim 1, wherein each glass has a melting temperature of first glass> second glass> third glass. 3. An R / W core block and an erase core block which are welded and integrated by glass with their center core pieces facing each other, wherein the center core piece is traversed by a predetermined amount across the disk contact surface of the R / W core block. R / W core of the lower composite head formed between the R / W core track width regulating grooves cut to the width and depth of the R / W core track width regulating groove on the disk contact surface of both core blocks R / W core of the lower composite head on the erase core block by an erase core track width regulating groove including a part outside in the width direction and being cut in parallel to a predetermined width and depth from the disk contact surface. Lower order formed coaxially with
Erased core of composite head, R / W core track width rule above
Between the groove and narrower than the R / W core of the lower composite head
The R / W core of the upper composite head formed in parallel,
The above-mentioned erase core
Formed coaxially with the R / W core of the upper composite head on the lock
A composite magnetic head device comprising : an erase core of an upper composite head to be formed; and a shielding member formed of glass filled in each of the track width regulating grooves.