JPH04229405A - Production of composite head - Google Patents

Abstract

PURPOSE:To improve mass productivity and to prevent off tracking by forming an erasing head core block and a recording/playback head core block to individual pieces and forming grooves for regulating track widths on both blocks, then integrating the two blocks. CONSTITUTION:An erasing (E) head core piece 2b and an erasing (E) center core piece 3b are integrated to form the E head core block. The grooves 9a to 9d for regulating the E head track widths are formed on this core block. On the other hand, a recording/playback (R/W) head core piece 2a and an R/W head center core piece 3a as well as a center spacer 4 are integrated to form the R/W head core block. The grooves 10a to 10d for regulating the R/W head track widths are then formed on this core block. Such E head core block and R/W head core block are integrally welded by using a glass rod. Since there are no chipping and off tracking according to this process for production, the composite head having high performance and high accuracy is obtd. and the number of stages is decreased.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite head of advance erasing type used in data recording/reproducing devices such as flexible disk drives.

0002

[Prior Art] FIG. 10 shows, for example,
FIG. 2 is a perspective view showing a conventional composite head disclosed in the above publication. In the figure, 1 is the entire composite head, 2a is a recording/reproducing (hereinafter referred to as R/W) head core piece, 2b is an erasing (hereinafter referred to as E) head core piece, and 3a is a R/W head core together with the R/W head core piece 2a. The R/W head center core piece 3b is an E head center core piece that constitutes the E head core together with the E head core piece 2b. Ferrite is used. 4
5 is a center spacer made of a non-magnetic material provided to prevent crosstalk between both head cores, 5 is glass filled in the track width regulating groove, and 6 is a Sendust alloy (F
e-Si-Al) or amorphous alloy (e.g. Co-Z
This is a magnetic film several microns thick made of r-Nb). FIG. 11 is an enlarged view of the sliding surface of the composite head in FIG. 10.

Next, an outline of a conventional head processing method will be explained. First, R/W head core piece 2a, E head core piece 2b,
Grooves for regulating the track width are formed on each of the center core pieces 3a and 3b independently, and a magnetic film 6 is attached to the R/W head core piece 2a by sputtering. After that, after aligning the track positions of the R/W head core piece 2a and the R/W head center core piece 3a, and at the same time aligning the track positions of the E head core piece 2b and the E head center core piece 3b, a glass plate is placed in each groove. is filled to form an R/W head core and an E head core. A nonmagnetic center spacer 4 is sandwiched between these cores, and both cores are bonded together using an epoxy adhesive to complete the composite head 1. If the center spacer 4 is made of glass, it is also possible to pour the glass into the center spacer portion at the same time as filling the track width regulating groove with glass.

0004

Since the conventional composite head is manufactured by the method described above, it has the following problems. Firstly, since each core piece is individually grooved, workability is poor. Second, since track alignment work is required, the R/W head core piece 2a and R
/W between head center core pieces 3a, E head core pieces 2b
Track misalignment is likely to occur between the R/W head core block and the E head center core piece 3b, and between the R/W head core block and the E head core block, leading to a reduction in head performance margin. Thirdly, when machining head grooves by mechanical grinding, there is a drawback that chipping is likely to occur at the end of the track.The chipping that occurs in this process leads to a narrowing of the actual track width, so This is a big problem with density recording heads.

[0005] This invention was made to solve the above-mentioned problems, and it is extremely easy to mass-produce, can suppress track deviation and chipping, has high chip strength, and is an electromagnetic It is an object of the present invention to provide a method for manufacturing a composite head that can manufacture a composite head with excellent performance at low cost.

[0006]

[Means for Solving the Problems] In the method for manufacturing a composite head according to the present invention, an R/W head core piece, an R/W head center core piece, and a center spacer are integrally formed, and an E head core piece and an E head center core are integrally formed. The two core blocks are formed integrally with each other, and then grooves are formed in each of these core blocks to regulate the track width, and finally the two core blocks are integrated.

Further, in the method for manufacturing a composite head according to the second invention, after the R/W head core piece and the R/W head center core piece are integrated to form the R/W head core block, grooves for regulating the track width are formed. After integrally forming this R/W head core block, E head center core piece and center spacer, grooves are processed to regulate the track width of the E track, and finally this core block and E head core piece are integrally welded. It is composed of

[0008]

[Operation] According to the method of manufacturing a composite head of the present invention, it is not necessary to perform track alignment work on each of the R/W head core and the E head core, and
When machining grooves to regulate the track width of the R/W head core, the gap surface does not appear on the grinding surface, so chipping of the R/W head core does not occur.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a composite head according to the present invention. In the figure, 2a and 2b are the R/W head core piece and E
Head core pieces 3a and 3b are R/W head centers respectively.
The material of the R/W head core piece 2a and the R/W center core piece 3a is Mn-Zn ferrite with excellent magnetic properties. The core piece 3b is made of Ni--Zn ferrite which has excellent workability. 4 is a ceramic center spacer provided between the R/W head center core piece 3a and the E head center core piece 3b. 5 is a low melting point lead glass filled in the track width regulating groove. In general, lead glass has the property that the glass with a lower lead content and higher working temperature has greater hardness and higher mechanical strength. Therefore, in the case of the MIG head in which the metal magnetic film 6 is formed in the R/W head core gap shown in this embodiment, the working temperature is 800°C in the welding process for integrating the E-head core piece 2b and the E-head center core piece 3b. In the process of welding the high melting point glass of 0.degree.
Use lead glass with a low melting point of 0°C. Furthermore, if vapor-deposited or sputtered high melting point glass is used as the gap forming material of the E head core, a head chip with high strength can be obtained. 6 is a metal magnetic film produced by sputtering, ion plating, or the like. FIG. 2 is an enlarged view of the sliding surface of the present head.

The manufacturing process of such a composite head will be explained with reference to FIGS. 3, 4, and 5. FIG. 3 is a process flow diagram, and FIGS. 4 and 5 are diagrams showing processing states in each process. First, the R/
Using the ferrite pieces 2 for the W head core pieces 2a and the E head core pieces 2b, the ferrite pieces 3 for the center core pieces 3a and 3b, and the ceramic plate 4, these are processed into predetermined dimensions by grinding. (FIGS. 3A to E) At this time, as shown in FIG. 4(d), the surfaces 7 of the pieces 2 and 3, especially the gap surfaces, are finished to a mirror surface without processing distortion,
Further, a groove 8 for a winding window into which a coil is inserted is formed by grinding using a diamond wheel or the like. Thereafter, as shown in FIG. 4(e), a magnetic film 6 is formed on the R/W head core piece 2a by sputtering. (Figure 3F)
When forming the magnetic film 6, in order to prevent film peeling and generation of bubbles, it is preferable that the magnetic film 6 be deposited only in the vicinity of the gap, as shown in the figure.

Next, each of the R/W head core piece 2a, the E head core piece 2b, and the center core pieces 3a, 3b, or only the R/W head core piece 2a and the E head core piece 2b side, or only the center core piece 3a, 3b side. A gap material such as SiO2 or Ta2O5 is then formed by vapor deposition or sputtering. (Figures 3G-J) Next,
As shown in FIG. 4(f), the E-head core piece 2b and the E-head center core piece 3b are combined and a load is applied to the glass rod 5a.
, 5b to melt and integrate. (Figure 3K) Also,
As shown in FIG. 4(g), the R/W head core piece 2a, the R/W
The head center core piece 3a and the center spacer 4 on which glass has been deposited or sputtered in advance (FIG. 3L) are sequentially arranged and held, and the glass rods 5a and 5b are melted and integrated. (FIG. 3M) After that, grooves 9a to 9 for regulating the track width of the E head core and R/W head core are formed in these welded core blocks as shown in FIGS. 4(h) and (i).
d and 10a to 10d are ground. (Figure 3N, O)
Note that the figure is shown schematically, and the number of grooves can be selected as appropriate. Next, as shown in FIG. 5(a), adhesive glass is formed by vapor deposition or sputtering on the surface of the E center core piece 3b or the center spacer 4, and the E head core block and R
/W The head core block is welded together using glass rods 5a and 5b. (Figure 3P)

Finally, after flattening the sliding surface, the area between A and B is polished by multi-wheel machining, etc., as shown in FIG. 5(b).
Grind away the area between C and D, then use a wire saw etc.
The composite head shown in FIG. 1 is completed by machining so as to leave the space between -F. In this method, when bonding the center spacer 4, the molten glass rods 5a and 5b are used after sputtering the glass without using an epoxy adhesive, so there is no gap in the adhesive layer, and it is also possible to pour the glass. Since a center spacer is not formed by the glass, there is no fear that the strength of the chip will deteriorate due to air bubbles generated when the glass solidifies.

Next, a method for manufacturing a composite head, which is a second invention, will be explained with reference to FIG. First, glass is formed by sputtering on the adhesive surfaces of the R/W head core piece 2a and the R/W head center core piece 3a, and the two are heated and welded together. Next, track width regulating grooves 10a to 10d are ground into this R/W head core as shown in FIG. 6(a), and then glass is deposited on both sides of this R/W head core as shown in FIG. 6(b). Alternatively, the ceramic center spacer 4 formed by sputtering and the E-head center core piece 3b are sequentially arranged, and by applying a load and heating, the glass of the center spacer 4 is melted and the three are integrated. Next, as shown in FIG. 4(c), a groove 9a for regulating the track width is formed in the E head center core piece 3b and the center spacer 4.
Process ~9d. After that, this core block is
), an E-head core piece 2b is attached, and they are welded together using glass rods 5a and 5b to integrate them. After that, the sliding surface was flat-polished, and as shown in Fig. 7, the areas A-B and C-D were ground away using multi-wheel processing, and then the areas E-F were processed using a wire saw, etc., leaving the area between E-F. , a composite head as shown in FIGS. 8 and 9 is completed.

In the above embodiment, the MIG head with the metal magnetic film 6 was explained, but the metal magnetic film 6
Needless to say, it can also be applied to a ferrite head without a ferrite head. Moreover, although the case where ceramic is used for the center spacer 4 is shown as an example, crystallized glass may be used instead of ceramic, and in this case, the surface of the crystallized glass can be melted and bonded. Furthermore, although the above method uses a welding method in which the glass is melted by raising the temperature, an anodic bonding method is adopted in which a DC voltage is applied between the center spacer 4 and the ferrite core to bond them together while heating. It is also possible to produce a composite head.

[0015]

As described above, according to the present invention, a head with high performance and precision can be obtained since there is no chipping or track deviation, and the head can be made inexpensive because the number of steps is reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a composite head manufactured according to a first invention.

FIG. 2 is an enlarged view showing the sliding surface of the composite head in FIG. 1;

FIG. 3 is a manufacturing process flow diagram of a composite head which is an embodiment of the first invention.

FIG. 4 is a perspective view showing a manufacturing process of a composite head that is an embodiment of the first invention.

FIG. 5 is a diagram showing a manufacturing process of a composite head that is an embodiment of the first invention.

FIG. 6 is a diagram showing a manufacturing process of a composite head which is an embodiment of the second invention.

FIG. 7 is a perspective view showing a manufacturing process of a composite head that is an embodiment of the second invention.

FIG. 8 is a perspective view showing a composite head manufactured according to the second invention.

9 is an enlarged view showing the sliding surface of the composite head in FIG. 8. FIG.

FIG. 10 is a perspective view showing the structure of a conventional composite head.

11 is an enlarged view showing the sliding surface of the composite head in FIG. 10. FIG.

[Explanation of symbols]

2a Recording/reproducing head core piece 2b Erasing head core piece 3a Recording/reproducing head center core piece 3b Erasing head center core piece 4 Center spacers 5a, 5b Glass rod 6 Metal magnetic film 7 Gap surface 8 Groove for winding window

Claims (2)

[Claims] 1. A step of integrating an erase head core piece and an erase head center core piece to form an erase head core block, a step of forming a groove for regulating the erase head track width on this core block, and a step of forming a recording/reproducing head core piece. a step of integrating the recording/reproducing head center core piece and a center spacer to form a recording/reproducing head core block; a step of forming a groove for regulating the recording/reproducing head track width on this core block; and a step of forming a recording/reproducing head track width regulating groove in the core block. A method for manufacturing a composite head, comprising the step of integrating the block and a recording/reproducing head core block. [Claim 2] A step of integrating a recording/reproducing head core piece and a recording/reproducing head center core piece to form a recording/reproducing head core block, and forming a groove for regulating the recording/reproducing head track width in this core block. and a step of forming a groove for regulating erase head track width in the center spacer and the erase head center core piece after integrating the core block, center spacer, and erase head center core piece. A method for manufacturing a composite head.