JPH0630126B2 - Composite magnetic head and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to writing and / or writing in a magnetic recording / reproducing apparatus.
Alternatively, the present invention relates to a composite magnetic head in which a read head (write / read shared magnetic head, write-only magnetic head, and read-only magnetic head) and an erase head are integrated, and a manufacturing method thereof.

[Prior Art] Conventionally, a write and / or read head (hereinafter, R /
A method of manufacturing a composite magnetic head in which a W head) and an erasing head are integrated is disclosed in, for example, Japanese Patent Laid-Open No. 60-150215. FIG. 7 is a perspective view showing the structure of the composite magnetic head. In the figure, (1) is R / W
L core forming the head, (2) I forming the R / W head
A core, (3) is an L core forming an erasing head, and (4) is an I core forming an erasing head. When combined, a window for winding is formed. (5) is the gap of the R / W head, (6) and (7) are the gap of the erase head, and (8a) and (8b) are the non-magnetic material filled in the groove that defines the track width T _E of the core of the erase head. For example, a filler made of glass, (9) is a non-magnetic material filled in the groove defining the track width T _W (> T _E ) of the R / W head, for example, a filler made of glass.
The R / W head composed of the L core (1) and the I core (2) is arranged such that its track is sandwiched by the tracks of a pair of erase heads composed of the L core (3) and the I core (4). The composite head (1d) is composed of the R / W head and the erasing head.

Next, a general procedure for manufacturing the composite head (1d) will be described with reference to FIG.

First, in step a, L core block (1a) and I core block (2a), L core block (3a) and I core block
The respective joints of (4a) are joined together and welded by glass in this case to form the R / W head block (1b) and the erase head block (3b).

In step b, grooves sl defining the tracks T _W and T _E by a processing machine using a rotating magnet for the R / W head block (1b) and the erasing head block (3b), respectively.
To create.

In step c, glass is deposited on the bonding surface of the R / W head block (1b) or the erase head block (3b),
R / W head block (1b) and erasing head block (3b) are joined so that both grooves sl are aligned to form a composite head block (1c) to form a welding jig for glass molding. Set to.

In step d, the composite head set on the welding jig
The block (1c) is put in a furnace, its temperature is raised, glass is melted in the groove sl, and both are integrally welded.

In step e, the glass protruding from the surface of the composite head block (1c) is removed by polishing to smooth the surface.

In the step e, the glass protruding from the surface of the composite head block (1c) is removed by polishing to smooth the surface.

In the above step e, the composite head block (1c) is cut at the portions to be the fillers (8a) and (8b) in FIG. 7 and then ground to a desired thickness to obtain the composite head (1d). .

[Problems to be Solved by the Invention] Since the conventional method for manufacturing a composite magnetic head is configured as described above, the gap between the heads in the head block, particularly the erase head gap, is narrow, and this portion Therefore, there is a problem that the core is easily damaged in the process of cutting the groove for defining the track width in the head block and the process of cutting out the composite head from the head block.

The present invention has been made in order to solve the above problems, and a composite magnetic head capable of advancing the manufacturing process without lowering the strength of the core and thus improving the manufacturing yield and a composite magnetic head The purpose is to obtain a manufacturing method.

[Means for Solving the Problems] In a composite magnetic head according to the present invention, a pair of cores molded so as to have a window for winding are joined to each other to form a write and / or read head and an erase head, respectively. In addition to being integrally joined, the erasing head is provided with a groove for defining the track only on one side of the core.

In a method of manufacturing a composite magnetic head according to another invention of the present invention, after a pair of core blocks are joined to form a write and / or read head block, a groove for defining the track width is cut. Further, a groove for defining the track of the erase head is provided only on one of the core blocks which are arranged so as to sandwich the track of the write and / or read head and which should be a pair of erase heads. After the provision, the core block and another core block forming a pair are joined together to form an erase head block, and the write and / or read head block and the erase head block are integrated. To form a composite head block, and then cut the composite magnetic head from this composite head block. And executes the processing.

[Operation] In the erasing head of the composite magnetic head of the present invention, only one of the paired cores has the groove for defining the track width, so that the core can retain sufficient strength. It becomes a structure that can.

According to another invention of the present invention, the erase head block in the process of manufacturing the composite magnetic head is provided with a groove for defining the track width only in one of the paired core blocks. Therefore, the core can retain sufficient strength even in the cutting process for forming the composite head after the formation.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
In the composite head (1d) shown in the figure, L core (1), I core
(2), L core (3), I core (4), gaps (5) (6) (7), and fillers (8a) (8b) are the same as or equivalent to those described with reference to FIG. . Here, it should be noted that the I core (4) has no groove. (9), (10) and (11) are fillers for defining the track width T _E , and are made of the same non-magnetic material as the filler (8a).

Next, the procedure for manufacturing the composite magnetic head according to the present invention will be described with reference to FIG.

In step a, a film made of SiO ₂ or Al ₂ O _{3 is} formed by vapor deposition or sputtering on the gap surface of the L core block (1a) and the I core block (2a) that have been subjected to the winding window and the clearance groove sl processing. . Next, L core block (1a)
And the joint surface of the I core block (2a) is welded with glass to form the R / W head block (1b). At this stage, the processing for the L core block (3a) and the I core block (4a) is not executed (first stage).

In step b, a groove sl having a track width T _W is formed using a rotating grindstone at a position where the tip of the apex is slightly cut and at an angle with respect to the R / W head block (1b) (second Stage).

In the step c, the groove sl is formed on the I core block (4a) using a rotary grindstone at an angle similar to the process of the step b, so that the L core block (3a) and the I core block (4a) are formed. A film made of SiO ₂ and Al ₂ O _{3 is} formed on the gap surface by vapor deposition or sputtering (third stage).

In step d, the L core block (3a) and the I core block (4a) are welded by glass to erase the erase head block.
Form (3b) (fourth stage).

In step e, a glass film for welding is formed on the R / W head block (1b) or the erasing head block (3b) by vapor deposition or sputtering, and the composite head is temporarily set with an adhesive as shown in the figure. -Form a block (1c).

In step f, a glass rod is inserted with the track side of the composite head block (1c) facing downward, and set in a welding jig. Next, in the high temperature furnace, the composite head block (1
c) is heated and a glass rod is poured into each groove sl. At this time, the glass film on the bonding surface of the composite head block (1c) is melted and the composite head block (1c) is integrated (fifth step).

In step g, the track surface of the composite head block (1c) is polished.

In step h, the composite head (1c) is cut out from the composite head block (1c), polished to obtain a predetermined thickness, and finally the legs are cut to complete the process (6th step). Stage).

At the cut-out stage h, the I core block (4a)
Since there is no groove in the composite head block (1c), the composite head block (1c) retains sufficient mechanical strength as compared with the conventional one.

In the above embodiment, as shown in FIG. 5, the glass rod was placed on the glass previously attached to the apex portion and then the glass rod was welded. However, as shown in FIG. A thin groove sl may be formed on the gap forming surface of the upper part of the above, and a glass rod may be placed on the core of the welded structure and then the mold welding may be performed.

[Effects of the Invention] As described above, according to the present invention, the R / W head block has a structure in which the groove for defining the track width is formed after the pair of core blocks are joined. Since no track deviation occurs, and for the erase head block, the groove for defining the track width is cut into only one of the paired core blocks at the stage of single product, Even in the process of individually cutting out the composite magnetic head thereafter, the core block can have sufficient strength, and therefore, the core defects can be reduced and the yield can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a composite magnetic head according to an embodiment of the composite magnetic head and the manufacturing method thereof according to the present invention,
FIG. 2 is an explanatory view for explaining a procedure for manufacturing a composite magnetic head according to the present invention, FIGS. 3 and 4 are structural views showing the structure of a conventional composite magnetic head, and FIG. 5 is a composite view according to the present invention. FIG. 6 is a state diagram showing a state where the glass rod is set in the process of manufacturing the magnetic head, and FIG. 6 is a state diagram showing a state where the glass rod is set in the process of manufacturing the composite magnetic head according to another embodiment of the present invention. FIG. 7 is a perspective view showing a structure of a conventional composite magnetic head, and FIG. 8 is an explanatory view for explaining a procedure for manufacturing the composite magnetic head by a conventional method for manufacturing the composite magnetic head. In the figure, (1) (3) is an L core (core), (1a) (3a) is an L core block (core block), (2) (4) is an I core (core), (2a) (4a). Is the I core block (core block), (1
b) R / W head block (write and / or read head block), (1c) composite head block, (3b) erase head block, (1d) composite head,
sl is a groove. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] 1. Writing and / or reading, which is formed by joining a pair of cores each having a window for winding to each other, and has a groove for defining a track width of recording in the cores. A head and a pair of cores, each of which is formed to have a window for winding, are connected to each other, and are arranged so as to sandwich a track of the write and / or read head and define the track. A magnetic head having an erasing head integrally bonded to the write and / or read head, the groove having only one of the grooves on one side of the core. 2. A first step of joining a pair of core blocks shaped to have windows for windings and to be write and / or read heads to form a write and / or read head block. A second step of cutting a groove in the write and / or read head block to define the track width of the write and / or read head, and shaped to include a window for winding, and Third step of providing a groove for defining the track of the erase head in a core block to be a pair of erase heads arranged so as to sandwich the track of the write and / or read head, and the third step Core block provided with the above groove, and another core to be paired with the core block to form the erase head. A fourth step of forming a lock and erase head blocks by joining, the first stage the writing formed by and / or reading head
A fifth step of joining the block and the erase head block formed by the fourth step to form a composite head block, and cutting the composite head block formed by the fifth step. And a sixth step of forming a composite head, thereby manufacturing the composite magnetic head.