JPH07249212A - Housing for composite type magnetic head - Google Patents

Abstract

PURPOSE:To avert failure of core chips by forming slits to be inserted and fixed with the core chips extending from the end face of a structural body adjacently to either of supporting parts existing in parts to be formed as right and left two air flowing surfaces. CONSTITUTION:The composite type magnetic heads 20, 20' of the structure are subjected to grinding and polishing in the state of supporting the parts where the right and left air floating surfaces 24, 24; 24', 24' are formed by the columnar supporting parts (18, 18') and, therefore, the air floating surfaces 24, 24' are deformed and a ski-jump phenomenon, such as the ends thereof jump up, like heretofore, does not arise. The core chips 22, 22' are wound with the coils 26, 26' in the state of reinforcing the chips with right and left supporting columns 18a, 18b or one side supporting column 18' and, therefore, the leg parts 30, 30' of the core chips 22, 22' are effectively protected and the failure of the core chips at the time of coil winding does not arise.

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 housing, and more particularly to a composite magnetic head used in a fixed magnetic disk drive, and more particularly to a housing used to manufacture a core slider thereof. is there.

[0002]

2. Description of the Related Art Among core sliders for floating magnetic heads used in fixed magnetic disk devices, there is a so-called composite type core slider. In this method, a slider body having an air bearing surface (air bearing portion) and a core chip for forming a recording / reproducing unit for writing or reading predetermined information on or from a magnetic disk which is a magnetic recording medium are separately manufactured, And, the slider body and the core chip, which are separately manufactured, are integrally assembled to each other, and have a structure that is different from the monolithic type.
It has a feature that the thickness of the core for recording / reproducing, and eventually the inductance can be reduced to improve the high frequency characteristics.

In manufacturing such a composite type core slider for a magnetic head, a housing for providing the slider body described above is conventionally known as shown in FIG. 7, for example. There is.
The housing 50 shown in FIG. 7 is composed of a rectangular parallelepiped structure made of nonmagnetic ceramics such as CaTiO _{3 and} has an inclined groove 5 for coil winding at its end.
2 and a groove (slit) 54 for inserting a core chip at the end of the portion that becomes the air bearing surface.

Then, as shown in FIG. 8, a well-known core chip 56 having a rectangular frame-shaped ring shape is inserted and positioned in the core chip insertion groove 54 of the housing 50, and integrated by glass bonding. As shown in FIG. 9, the left and right air-bearing surfaces 58, 58 are formed by cutting, further polished, and then the coil 62 is wound around one leg 60 of the core chip 56. Thus, the intended composite magnetic head 64 is configured.

Incidentally, with the increase in capacity and size of fixed magnetic disk devices, there is a demand for size reduction and higher performance of magnetic heads and also of core sliders used therein, and in particular, reduction of inductance is required. Therefore, in addition to downsizing of the core, it is necessary to reduce the cross-sectional area of each part of the core, particularly the part around which the coil is wound, that is, to make the core thinner (thinner).

However, when the core slider is manufactured by using the housing 50 having the conventional structure as described above to manufacture the intended magnetic head, the thin core chip 56 is inserted into the core chip insertion groove 54, After being fixed by glass bonding, the air bearing surface 58 is formed by cutting, and when this is polished and finished, as shown in FIG.
As shown in (a) of FIG.
The core chip 56 deforms (bends) without being able to support the load applied to the core chip 56. Therefore, as shown in FIG. However, there is a problem of unreliability such that the flying characteristics of the magnetic head are deteriorated and a collision (crash) between the magnetic head and the magnetic disk may occur.
When winding 2, the leg yield 60 of the thin core chip 56 was damaged, and there was an inherent problem in product yield.
Furthermore, the core chip 56 in the core chip insertion groove 54
In the case where the thin (thin) leg portion 60 is insufficiently fixed, noise that is considered to be due to the vibration of the leg portion 60 during operation as a magnetic head, so-called RAW (Ring A)
fter Write) There were also problems such as noise.

[0007]

Here, the present invention has been made in view of the above circumstances, and the subject is to:
An object of the present invention is to provide a housing for a composite type magnetic head having a new structure that solves the above problems.

[0008]

In order to solve the above problems, the present invention comprises a structure made of non-magnetic ceramics, and a through hole serving as a coil winding hole is formed in a magnetic recording medium slide of the structure. The one end side in the moving direction is parallel to the surface on the sliding side of the magnetic recording medium and orthogonal to the sliding direction, and extends in the sliding direction on the surface on the sliding side of the magnetic recording medium. There is a window portion that is located between the two left and right air-bearing surfaces that are parallel to each other and that extends from the through hole to the end surface on the one end side in the sliding direction of the magnetic recording medium and opens at the end surface. In addition, one of the supporting pillars formed on the left and right of the end of the structure at the window, which is to be the two air-bearing surfaces on the left and right, or one of the supporting pillars. Adjacent to the pillar,
The gist is a housing for a composite magnetic head, which has a slit for inserting and fixing a core chip extending from an end face of the structure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to clarify the present invention more specifically, representative embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 (a) and 1 (b) show different examples of housings for a composite type magnetic head according to the present invention, and FIGS. 2 and 3 show those housings. An example of the process for doing
Each is shown. In these drawings, in order to obtain the composite magnetic head housings 10 and 10 'according to the present invention, in the manufacturing process shown in FIG.
A substrate 2 and a flat plate 4 of a predetermined size made of non-magnetic ceramics such as aTiO ₃ are prepared. It should be noted that one surface of the substrate 2 has two widthwise (horizontal direction) lateral grooves 2a, 2a which are parallel to each other and a single longitudinal groove 2b having a wide width in the longitudinal direction (front-back direction) with a predetermined size and interval. The vertical grooves 2b are provided at substantially the same depth, and support portions 2c having a predetermined height are formed on both sides of the substrate 2 in the vertical groove 2b.

Then, either one of the substrate 2 and the flat plate 4 or both of them are joined to each other, that is, the supporting portion 2c of the substrate 2 is joined.
A glass film for bonding is formed on the top surface of the plate or one surface of the flat plate 4, or on both surfaces by a method such as sputtering, application of glass paste, baking, etc., and then, through such glass film. Then, the substrate 2 and the flat plate 4 are superposed on each other and heated to soften the glass to bond them with each other to form a bonded body 6, which is further divided into two (X in FIG. 2). −
(At X ') to obtain two of the structures 8 that provide the desired housing. In addition,
By joining the substrate 2 and the flat plate 4 to cover the lateral groove 2a formed in the left and right direction of the substrate 2 with the flat plate 4, in the structure 8, one end side thereof has a through hole extending in the width direction. 12 is formed, and the wide vertical groove 2b extending in the front-back direction of the substrate 2 is covered with the flat plate 4, so that the window portion 14 extending from the through hole 12 to the end face of the structure 8 is formed. Become.

Then, the structure 8 is subjected to machining such as cutting as shown by a broken line in FIG. 2 to cross the through hole 12 to the other end side of the structure 8. The extending slit 16 for core chip insertion is provided with a predetermined width in a length sufficient to accommodate the core chip. That is, the core chip insertion slit 16
Is a supporting portion 2c of the substrate 2 located on the left and right of the window portion 14 at one end portion of the structure 8 where the through hole 12 is formed.
2c is provided at one of the formation sites of the support columns 18 and 18, and in the lower left view of FIG. 2, such a slit 16 is located in the support column 18 site, and as shown in FIG. In the lower right diagram of FIG. 3, there is shown a mode in which the slits 16 are respectively provided in the state where the slits 16 are adjacent to the support columns 18.

Further, in another manufacturing process of the composite magnetic head housing shown in FIG. 3, the shapes of the substrate 2'and the flat plate 4'are slightly different from those used in the manufacturing process of FIG. There is. That is, in the substrate 2 ',
A fitting groove 2'a having a predetermined width is provided in the center portion in the left-right direction, while the flat plate 4'is provided with supporting portions 4'a, 4'a having a predetermined length in the left-right direction in the width direction. Are provided integrally with each other. Then, the flat plate 4'is held in the fitting groove 2'a of the substrate 2 ', and the supporting portion 4'a of the flat plate 4'is attached to the substrate 2'.
So that they are located on the side, and then they are joined by glass as in the case of FIG. 2 above to form a joined body 6 ′, which is further divided into two (at the position of XX ′ in FIG. 3). In ()), the structure 8'which gives the desired hanging is obtained. By joining the flat plate 4'to the substrate 2 ', two mutually parallel through holes 12', 12 'are formed in the joined body 6'in the left-right direction, and the joined body 6'is cut along the line X-X. A through hole 12 'is formed on one end side of the structure 8'by cutting at the' portion, and a window portion 14 'which is opened from the through hole 12' to the end face of the structure 8'is formed. Becomes

With respect to the structure 8 ', as shown in FIG.
The core chip insertion slit 16 'is formed by machining such as cutting as shown by a broken line in FIG.
Are provided across the through hole 12 'with a predetermined width and with a length sufficient to accommodate the core chip. In the lower left view of FIG. 3, a slit 16 'is provided for one of the supporting columns 18', 18 'formed on the left and right of the window portion 14' so as to be located in the forming portion. Further, in the lower right diagram, the slit 16 'is shown to be formed in a state of being adjacent to the support column 18'.

By the way, in FIG. 1, the housing 10 for the composite type magnetic head shown in FIG. 1A is obtained by machining as shown in the lower left diagram of FIG. 2, and the composite type housing shown in FIG. The magnetic head housing 10 'is obtained by machining as shown in the lower right diagram of FIG. As is clear from FIG. 1, each of the composite magnetic head housings 10 and 10 'is composed of a rectangular plate-shaped or block-shaped structure 8 or 8'which is made of non-magnetic ceramics. The through holes 12 and 12 'serving as coil winding holes are arranged parallel to the sliding surface of the magnetic recording medium so as to be positioned at one end side in the sliding direction of the magnetic recording medium. It has so as to be orthogonal. Further, the window portions 14 and 14 'which are opened at the end faces of the structures 8 and 8'on one side in the sliding direction of the magnetic recording medium are the surfaces on the sliding side of the magnetic recording medium of the structures 8 and 8'. It is provided between the two left and right air-bearing surfaces which are parallel to each other and which extend in the sliding direction, and the presence of the windows 14, 14 'allows the left and right ends of the structures 8, 8'to be formed. In addition, the support pillars 18, 18;
8'and 18 'are provided in a form of supporting the air-bearing surface forming portion. Then, through either of the left and right support columns 18, 18; 18 ', 18', the through holes 12, 12 'are traversed from the end face of the structure 8, 8'.
Slits 16 and 16 'for inserting and fixing the core chip extending in the sliding direction of the magnetic recording medium are provided at a predetermined depth (length). By the formation of the slits 16, one support pillar 18 has two parts 18a and 18b.
In addition, the slit 16 'is positioned in the form adjacent to the inside of the support column 18'.

Then, such housings 10 and 1
By using 0 ', the composite type magnetic head 20, 20' as shown in FIGS. 4 (a) and 4 (b) is manufactured.
That is, the slits 16, 16 'of the housing 10, 10'
The core chips 22 and 22 ′ having a known structure similar to the core chip 56 shown in FIG. 8 are inserted into the inside thereof, and the core chip 2 is formed by a known glass bonding method.
After fixing 2 and 22 'to the housings 10 and 10', on the surface of the housings 10 and 10 'on the sliding side of the magnetic recording medium, two left and right air floats parallel to each other extending in the sliding direction. Faces 24, 24; 24 ', 24',
As in the past, it is formed with a predetermined width by grinding and polishing,
After that, by winding the coils 26, 26 'around the legs 30, 30' of the core chips 22, 22 ', the intended composite magnetic heads 20, 20' are completed. The left and right air floating surfaces 24, 24; 24 ', 2
At the leading end of 4 ', a gently sloped slope (leading ramp) 28, 28; 28', 28 '
However, each is formed by the same reading lamp processing as the conventional one.

Therefore, in the composite magnetic heads 20 and 20 'having such a structure, the left and right air floating surfaces 24 and 2 are formed.
4; 24 'and 24' are formed in a columnar support portion (1
8, 18 '), the grinding and polishing processes for forming such air-bearing surfaces 24, 24' are carried out. The air-bearing surfaces 24, 24 '.
The conventional ski-jump phenomenon, in which the edge is deformed and its end jumps up, is not caused at all, which causes deterioration of the flying characteristics of the magnetic head or collision with a magnetic disk (magnetic recording medium). Can be caused by
It can be effectively avoided and its reliability can be significantly increased.

The core chip insertion slits 16 and 1
Such a slit 1 is provided by the provision of 6'in the support columns 18, 18 'or adjacent thereto.
The core chips 22 and 22 'which are inserted and positioned in 6, 6'and fixed are in a state of being sandwiched from the left and right by the support columns 18a and 18b, or one side portion thereof is the support column 18'. The core chip 2 which is to be retained in the form reinforced by
2, 22 'can be effectively thinned (thinned), and the inductance can be effectively reduced.
Noise reduction can also be achieved advantageously, and the core chip 2
2, 2'is reinforced by the left and right support pillars 18a, 18b or one side support pillar 18 ', the coil 2
Since 6 and 26 'are wound, the leg portions 30 and 30' of the core chips 22 and 22 'can be effectively protected, and problems such as breakage of the core chip during coil winding are also caused. Has disappeared.

The cross section AA of the composite magnetic head 20 shown in FIG. 4A is shown in FIG.
However, the core chip 22 has a generally rectangular annular structure as described above, and as is well known, a magnetic gap 32 for recording / reproducing is provided on the upper side thereof. Having and also its magnetic gap 32
Tracks are applied to the portions sandwiching the gaps to form track portions 34 having a predetermined height, while the magnetic gap 32 is protected by a protective glass 36 as in the conventional case. . Then, with respect to the leg portion 30 of the core chip 22 having such a structure, as shown in FIG. 4, together with the supporting columns 18a and 18b sandwiching the leg portion 30 from both sides,
The coil 26 is wound.

In the magnetic heads 20 and 20 'having the structure shown in FIG. 4, core chips 22 and 22' are used.
Is reinforced by support columns 18 and 18 'integrally provided on the housings 10 and 10', and the leg portions 30 and 30 'thereof have sufficient strength. As shown in FIG. 6 (b), the groove 42 is formed in the support columns 18 and 18 with the core chip 22 fixed, so that the cross-sectional area of the coil winding portion in the leg portion 30 of the core chip 22 is reduced. It can be made even smaller, which makes it possible to further reduce the inductance.

The composite type magnetic head housing according to the present invention has been described above in detail based on its representative example. However, the present invention should be construed as being limited to such specific examples. However, it is understood that the present invention can be carried out in a form in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Should be.

[0022]

As is apparent from the above description, in the composite magnetic head housing according to the present invention, the core chip insertion slit is formed on the surface of the housing on which the magnetic recording medium slides and on the opposite side. It is provided in a form reinforced by a supporting column that connects the surface, and by inserting and fixing the core chip into such a slit, the core chip is fixed to the supporting column having high strength. As a result, it was possible to effectively avoid damage to the core chip when winding the coil, and also when polishing finish processing was performed to obtain the desired air bearing surface. In addition, it is possible to effectively avoid the phenomenon that the air bearing surface jumps up, in other words, the ski jump phenomenon is caused. It is.

Moreover, since the core chip is reinforced by the presence of the support pillars integrally provided in the housing, the core chip can be made thinner and its inductance can be effectively reduced. RAW
Noise can also be advantageously reduced, especially by forming a groove in the support column,
It is also possible to further reduce the inductance by making the leg portion of the core chip fixed to such a support pillar thin and further reducing the cross-sectional area of the coil winding portion of the leg portion. Of.

[Brief description of drawings]

FIG. 1 is a perspective view showing a housing for a composite magnetic head according to the present invention, in which (a) and (b) show different examples.

FIG. 2 is an explanatory diagram showing an example of a manufacturing process of the housing shown in FIG.

FIG. 3 is an explanatory view showing another example of a manufacturing process of the housing shown in FIG.

FIG. 4 is a perspective explanatory view showing an example of a composite type magnetic head obtained by using the housing shown in FIG.
And (b) are (a) and (b) in FIG. 1, respectively.
The case where the housing shown in is used is shown.

FIG. 5 is a perspective explanatory view showing another example of the composite magnetic head having a structure different from that of FIG.

6 is a cross-sectional explanatory view of a core chip fixing portion, FIG. 6A is a cross-sectional explanatory view taken along the line AA of the composite magnetic head shown in FIG. 4A, and FIG. FIG. 3 is a cross-sectional view taken along the line BB in the combined magnetic head shown in FIG.

FIG. 7 is a perspective explanatory view showing an example of a conventional housing for a composite type magnetic head.

FIG. 8 is an explanatory view showing an example of a conventional core chip, in which (a) is a perspective view thereof and (b) is a side view thereof.

9 is a perspective explanatory view showing a magnetic head manufactured using the conventional composite type magnetic head housing shown in FIG. 7. FIG.

FIG. 10 is an explanatory view showing a state at the time of polishing an air bearing surface in a conventional composite type magnetic head housing,
(A) is a side view showing a state in which a core chip is deformed by a load applied during polishing of an air-bearing surface, and (b) is a side view showing how the air-bearing surface is lifted up after polishing of the air bearing surface.

[Explanation of symbols]

2 Substrate 2a Fitting groove 2b Vertical groove 2c Support part 4 Flat plate 6 Joined body 8 Structure 10 Magnetic head housing 12 Through hole 14 Window part 16 Core chip insertion slit 18 Support pillar 20 Composite magnetic head 22 Core chip 24 Air floating surface 26 coil 28 slope part 30 leg part 32 magnetic gap 34 track part 36 protective glass 42 groove 50 housing 52 inclined groove 54 core chip insertion groove 56 core chip 58 air floating surface 60 leg part 62 coil 64 composite magnetic head

Claims (1)

[Claims] 1. A magnetic recording medium sliding member which is formed of a non-magnetic ceramic structure and has a penetrating hole serving as a coil winding hole at one end side in the magnetic recording medium sliding direction of the structural member. Side surfaces that are parallel to each other and are orthogonal to the sliding direction, and two air floating surfaces on the left and right sides that are parallel to each other and that extend in the sliding direction are formed on the surface that is the sliding side of the magnetic recording medium. Located between the through holes and reaching the end face on the one end side in the sliding direction of the magnetic recording medium from the through hole and opening at the end face, and the end of the structure body at the window part. An end surface of the structure, which is formed on the left and right sides of the portion, and which is located on one of the supporting pillars located at the two left and right air-bearing surfaces, or adjacent to the supporting pillars. From which the core chip is inserted and fixed A housing for a composite type magnetic head having a rit.