JPH03288306A - Multichannel magnetic head and manufacture of the same - Google Patents

Abstract

PURPOSE:To improve accuracy for the structure of a head by deciding the track pitch of the multichannel magnetic head according to the working accuracy of a projecting part to be formed on a non-magnetic base plate, and obtaining the in-line accuracy of a gap to be formed on the same plane by precise grinding. CONSTITUTION:A magnetic head core part and a slider part are formed on a non- magnetic base plate 1 composed of barium titanate, zirconia and crystalized glass or the like with satisfactory wearing resistance, and projecting parts 25 and coil grooves 24 equivalent to the number of channels are formed on the gap counter surface of the base plate 1. In this part, a magnetic layer 2 composed of non-crystal Co-Nb-Zr and 'Sendust(R)' or the like with high saturated magnetic flux density and high permeability is attached while being magnetically insulated by a magnetic groove 12 and a channel separate groove 13. On the other hand, lead glass or the like is used for an adhesive agent 3 to be filled in the groove 12 and to couple core half bodies 50 and 51, and the return path of a magnetic circuit is constituted of an alternate laminated block 50 formed by a back core, which is composed of Ni-Zn ferrite or the like, and a back separator 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-channel magnetic head capable of recording and reproducing on a plurality of tracks and a method for manufacturing the same.

[Conventional technology]

In recent years, the capacity of magnetic memories such as floppy disks and hard disks has been increasing. Along with this, magnetic recording media such as metal floppy disks that use metal powder with high coercive force as the magnetic material have been developed, and the signals recorded on magnetic recording media have increased linear recording density and track density. ing. Since track density can be relatively easily increased by narrowing the track width of a magnetic head, efforts are currently being made to narrow the tracks of magnetic heads.

As the track density of floppy disks and the like increases, highly accurate tracking servo of the drive becomes necessary. A sector servo is one type of tracking servo. This is a method in which a dedicated sector for servo is provided on a floppy disk, a tracking servo signal is recorded in that sector in advance, and the signal is read by a magnetic head to apply tracking servo. As a magnetic head for writing such a servo signal, a multi-channel magnetic head that can write to a plurality of tracks simultaneously is advantageous because it can shorten the writing time.

As a conventional multi-channel magnetic head, a configuration as shown in FIG. 18 has been proposed. Here, 30 is a head chip, which includes a core base (non-magnetic base 1) made of a magnetic material or non-magnetic material such as Mn-Zn ferrite, and a mountain formed by cutting on the gap-opposing surface of this core base 1. For example, amorphous Co-N deposited on the protrusion of the shape.
Core halves 40 and 41 each having a magnetic layer 2 made of a magnetic material having high saturation magnetic flux density and high magnetic permeability, such as b-Zr, Sendust, Fe-3i, etc., are bonded together by bonding glass made of lead glass or the like. It has a structured structure. 4 is a channel separator made of a non-magnetic material such as barium titanate or calcium titanate; 7 is an excitation coil; 20
2 is a slider made of the same material as 2. 19 is a slider groove, 21 is a gap, and 22 is a winding window.

A method of manufacturing the above multi-channel magnetic head will be described with reference to FIGS. 19 to 24.

First, as shown in FIG. 19, a large number of approximately V-shaped (approximately triangular) grooves 23 are formed in parallel at predetermined intervals on one side of a flat block (non-magnetic substrate) 1 made of, for example, Mn-Zn ferrite. The protrusion 25 of the core base (non-magnetic base) 1 is formed by cutting.Furthermore, the groove (winding groove) 24 for use in the winding window 22 is formed by cutting orthogonally to the groove 23. do.

Next, as shown in FIG. 20, for example, Co
- The magnetic Hll (m layer) 2 is made of a magnetic alloy material with high saturation magnetic flux density and high magnetic permeability such as Nb-Zr magnetic alloy.
is formed into a bottom film to a predetermined thickness using thin film forming techniques such as vapor deposition and sputtering.

Subsequently, as shown in FIGS. 21 and 22, the bonded glass 3 is filled and adhered to the entire surface of the block 1 relatively thickly, and then the bonded glass 3 is placed in the direction A-A in the figure. The magnetic thin film 2 on the ridge line of the projection 25 has a track width T.
It is made to be exposed with W.

In this step, the bonded glass 3 in the groove 24 of the wire-wound window 22 is also removed.

Next, the block 1 which is the base material for the core is B- in FIG.
B&! The first core base material 42 for one of the core halves 40 described above and the second core base material 43 for the other core half 41 are separated.

After this, as shown in FIG. 23, the first core base material 42
and the second core base material 43 are positioned by abutting the magnetic thin film 2 exposed on the ridgeline of the protrusion 25, and by heating in this state, the bonded glass 3 is bonded to the first core base material 43.
The second core base materials 42 and 43 are integrated. After that, the head chip 30 that authorizes the multi-channel magnetic head is sliced along the dashed line in the figure.
is obtained.

Next, as shown in FIG. 24, a predetermined number of head chips 30 each having an excitation coil 7 wound thereon are laminated and bonded with a channel separator 4 in between.Finally, a slider 20 is bonded, and as shown in FIG. The multi-channel magnetic head shown is obtained.

[Problem to be solved by the invention]

In the multi-channel magnetic head as described above, after the excitation coils 7 are wound around the individual head chips 30, they must be arranged accurately at predetermined intervals.

In the above method, as shown in FIG. 25, Tp accuracy (accuracy of the interval Tp of the gaps 21) and inline accuracy of the gaps 21 (accuracy that the gaps 21 are lined up on the straight iI)
It becomes difficult to secure. Furthermore, since there are a large number of parts, assembly work is complicated and mass production is poor.

An object of the present invention is to solve the disadvantages of the conventional products described above, such as poor processing accuracy and poor mass productivity, and to provide a multichannel magnetic head that can be easily manufactured with high precision and a method for manufacturing the same. .

[Means to solve the problem]

In a multi-channel magnetic head that performs recording and reproduction on multiple tracks on a magnetic recording medium, a high saturation magnetic flux density and high permeability material is attached to a protrusion provided with the required number of channels on a substrate made of a non-magnetic material. A portion of the ridgeline of the protrusion of the magnetic film having magnetic properties is exposed on the same plane with substantially the same track width, and a pair of core halves each having a groove for winding on at least one of them are butted against each other. By forming the slider part on a part of the substrate made of magnetic material and creating an integrated structure, the track pitch accuracy and in-line accuracy of the multi-channel magnetic head are ensured, and furthermore, the effort of adding the slider after the slider is eliminated, increasing mass productivity. .

〔Example〕

Examples of the present invention will be described below.

FIG. 1 shows a perspective view of an embodiment of a multi-channel magnetic head according to the present invention, in which 1 is made of materials such as barium titanate, calcium titanate, zirconia, crystallized glass, etc. that form the magnetic head core part and slider part. Non-magnetic substrate (substrate) made of non-magnetic material with excellent wear resistance such as
, 2 is a protrusion 2 formed on the gap-opposing surface of the non-magnetic substrate 1 by the required number of channels (here, 4 channels).
5 and the amorphous Co-Nb-Zr coated on the winding groove 24.
The magnetic layer is made of a magnetic material having high saturation magnetic flux density and high magnetic permeability, such as , Sendust, Fe-5, etc., and each channel is magnetically insulated by an insulating groove 12 and a channel separation groove 13 . 3 is a bonding glass such as lead glass, which serves as a filler in the insulating groove 12 and a bonding material for the core halves 50 and 51; 4 is a core half 5 having a winding groove 24;
A channel separator 60 made of a non-magnetic material similar to that of the non-magnetic substrate 1, which is embedded from the sliding surface between each channel of 0 to the upper part of the winding part, 60 is, for example, MnZn ferrite,
A back core block is made by alternately laminating and bonding a back core 5 made of a bulk magnetic material such as Ni-Zn ferrite and a back core separator 6 made of a nonmagnetic material similar to that of the nonmagnetic substrate 1, and is used to block the magnetic head core on the rear side. This serves as a return bus for the magnetic circuit formed by the magnetic layer 2. 7 is an excitation coil, which is wound for each channel.

19 is a slider groove.

An embodiment of the method for manufacturing the multi-channel magnetic head of the present invention shown in FIG. 1 will be described with reference to FIGS. 2 to 16.

First, as shown in FIG. 2, a predetermined number of substantially parallel V-shaped track regulating grooves 8 are machined on a non-magnetic substrate 1 made of barium titanate, and a chevron-shaped protrusion 25 with a predetermined number of channels is formed. Form.

Next, as shown in FIG. 3, a trapezoidal winding groove 24 is provided by machining so as to be perpendicular to the track regulating groove 8.

Next, as shown in FIG. 4, a magnetic layer 2 made of an amorphous Co--Nb--Zr magnetic alloy is deposited to a predetermined thickness on the bottom surface of the track regulating groove 8 and the winding groove 24 by sputtering.

Next, as shown in FIG. 5, the magnetic layer 2 is filled with a relatively thick bonding glass 3 made of lead glass.

Next, as shown in FIG. 6, the bonded glass 3 is removed by polishing to a suitable degree, and then the bonded glass 3 filled in the winding groove 24 is removed by machining except for a predetermined portion.

Next, as shown in FIG. 7, an insulating groove 12 of a predetermined depth is provided by machining along the track regulating groove 8 to insulate magnetic coupling between the channels of the magnetic layer 2.

Next, as shown in FIG. 8, a channel separation groove 13 is formed in the insulating groove 12 for magnetically insulating the magnetic layer 2 adhered to the winding groove 24 between each channel and for winding. It is provided along the line up to approximately the center of the nonmagnetic substrate 1.

Next, as shown in FIG. 9, a channel separator 4 made of barium titanate is inserted into a predetermined position of the channel separation groove 13.

Next, as shown in Fig. 10, the remaining bonding crow 3
is heated and melted to seal the insulating groove 12 and the channel separator 4.

Next, the glass surface is polished to expose a predetermined track width (Tw) as shown in FIG. 50 and a core half 51 without the winding groove 24 at the dotted line in the figure.

Next, as shown in FIG. 12, a gap material (not shown) of a predetermined thickness is applied to the polished surface of at least one core half, the polished surfaces are butted together, heated, and bonded glass 3 is bonded. After joining, the sliding surface 26 is polished until the channel separator 4 is exposed (dotted line), the rear part 27 is cut at a predetermined position (dotted line), and the magnetic circuit is cut off at -.

Next, as shown in FIG. 13, a slider groove 19 is formed by machining, and unnecessary parts of the slider are removed (see dotted lines).

Next, as shown in FIG. 14, the winding 424 of each channel is
After winding the excitation coils 7 in the respective parts, a hack core block 60 formed by alternately laminating and bonding magnetic materials 5 made of Mn-Zn ferrite and hack core separators 6 made of barium titanate is inserted and bonded into the rear part. Restore the magnetic circuit.

Finally, the edges of the sliding surfaces are chamfered to obtain the multichannel magnetic head of the present invention shown in FIG.
Figure 15).

As a method of forming the return path section, as shown in FIG. 16, the back core block 60 may be joined after deeply cutting out the rear side of the magnetic head. In this embodiment, a multi-channel magnetic head according to the present invention is obtained, and a method for producing a large number of magnetic heads can be easily developed by applying the above method.

FIG. 17 is an enlarged view of the gap portion on the sliding surface of the multi-channel magnetic head shown in FIG. In the figure, the track pitch (Tp) is determined by the processing accuracy of the protrusion 25 formed on the non-magnetic substrate 1, so it is ±1μ.
Accuracy of around m is ensured. Further, the in-line accuracy of the gap 21 is guaranteed by forming the gap on the same plane obtained by precision polishing.

〔Effect of the invention〕

As described above, in the multi-channel magnetic head of the present invention, the track pitch (Tp) is determined by the processing accuracy of the protrusions formed on the non-magnetic substrate, and the in-line accuracy of the gap can be obtained by precision polishing. By forming the gaps on the same plane, very high precision can be achieved. Furthermore, since the slider is formed from a part of the non-magnetic substrate, it is excellent in mass production.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the multi-channel magnetic head of the present invention, FIGS. 2, 3, 4, 5, 6, 7, 8, and 9. , Fig. 10, Fig. 11, Fig. 1
2, 13, 14, 15, and 16 are process diagrams explaining the method for manufacturing the multichannel magnetic head shown in FIG. An enlarged view of the sliding surface of the magnetic head, FIG. 18 is a perspective view of a conventional multi-channel magnetic head, FIG.
0, 21, 22, 23, and 24 are process diagrams explaining the method for manufacturing the conventional multichannel magnetic head shown in FIG. 18, and FIG. FIG. 2 is an enlarged view of a sliding surface of a conventional multichannel magnetic head. DESCRIPTION OF SYMBOLS 1...Nonmagnetic substrate, 2...Magnetic layer, 3...Bonding glass, 4...Channel separator, 7...
Excitation coil, 19...Slider groove, 24...Winding groove, 25...Protrusion, 50.51...Core half,
6o...Back core block. Fig. 1 Fig. 2b Fig. 3 Fig. 4 Fig. Fig. Fig. Fig. 2 Fig. 10 Fig. 11 W Fig. 12 Fig. 7 Fig. 14 Fig. 0 Fig. 19 Fig. 20 Fig. 5 Fig. 18 Fig. 1 w Figure 22 Figure 23 Figure 15 Figure 24

Claims (2)

[Claims] (1) In a multi-channel magnetic head that performs recording and reproduction on multiple tracks on a magnetic recording medium, a substrate made of a non-magnetic material has a protrusion provided with the required number of channels, and a protrusion attached to the protrusion. abutting two core halves having a magnetic film having high saturation magnetic flux density and high permeability and a groove for winding on at least one side;
A multi-channel magnetic head characterized in that a slider portion is formed on a part of the substrate made of the non-magnetic material to form an integral structure. (2) 1) Step of forming parallel V-shaped grooves on a substrate made of non-magnetic material and forming protrusions corresponding to the required number of channels, 2) Trapezoidal grooves perpendicular to the grooves formed in step 1) 3) providing a magnetic film having high saturation magnetic flux density and high magnetic permeability on the surface where the grooves were provided in steps 1) and 2) by a thin film forming method such as physical vapor deposition; 4) A step of placing glass on the magnetic film and heating it above the softening temperature to fill it; 5) A step of leaving an appropriate amount of glass on the magnetic film and polishing the surface flat; 6) A step of forming the grooves formed in step 2). 7) Step of providing an insulating groove for magnetically insulating the magnetic film in each track parallel to the protrusion formed in step 1); 8) Inner wall of the groove formed in step 2) a step of magnetically insulating the magnetic film provided in the magnetic film and providing a channel separation groove up to a predetermined position for winding the magnetic head of each channel; 9) the magnetic head in the groove provided in step 8); A step of inserting a channel separator made of a non-magnetic material from the vicinity of the sliding surface to the winding window, 10) heating above the softening point of the glass to melt the remaining glass and sealing the insulating groove and the channel separator. a step of sealing, 11) a step of polishing the glass surface to expose a predetermined track width, 12) a step in which the core that has undergone step 11) does not have a core having a winding window having at least a portion of the channel separator. Step of dividing into cores: 13) After applying a gap material of a predetermined thickness to the polished surfaces of the cores divided in step 12), the cores are butted against each other so that the track width exposed surfaces face each other, and heated to a temperature above the softening point of glass. 14) cutting the back side of the core joined in step 13) at a predetermined position to interrupt the magnetic circuit; 15) forming a slider groove at a predetermined position on the sliding surface; 16) A step of polishing the sliding surface to a predetermined head gap depth, 17) A step of winding the magnetic head of each channel a predetermined number of times, 18) Adding a magnetic material to the magnetic circuit interrupting portion formed in step 17). 19) A method for manufacturing a multi-channel magnetic head, comprising the steps of: bonding a back core formed by laminating non-magnetic materials; 19) Finally, chamfering a sliding surface.