JPS63209017A - Production of composite type head chip - Google Patents

Abstract

PURPOSE:To eliminate the need for a spacer and to permit increase in the thickness of center cores by diagonally notching the respective opposed surfaces of the center cores of both heads and molding glass into the spacing thereof. CONSTITUTION:A distance D4 for magnetical sepn. of the R/W head 1 and the E head 1 is diagonally formed. The need for the spacer which is required heretofore is thereby eliminated and the glass molded part 4 to assure the distance for the magnetical sepn. of the two heads is formed diagonal and, therefore, the increase in the thickness of the center cores 6, 11 is permitted, by which the sectional area of the center cores is increased and the generation of magnetic saturation is substantially prevented even if the head chip is used in a ferromagnetic field. Since the grooving for this purpose is possible simultaneously with the same machine as for grooving to control the track width, the effectiveness in terms of productivity and accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a composite head chip used in a floppy disk device or the like.

[Conventional technology]

FIG. 16 is a perspective view showing a composite head chip disclosed in, for example, Japanese Unexamined Patent Publication No. 61-175915. (hereinafter referred to as R/W rad core),
Reference numeral 3 is composed of an erasing head core (hereinafter referred to as E head core), a glass mold part (4) for magnetically separating these from each other, mechanically integral +C, and joining them. The R/W side core (2) is made of a ferromagnetic material such as ferrite, and the R/W side core (5) is made of a ferromagnetic material such as ferrite.
It is composed of a W center core (6), a glass welding part (7) that fixes the R/W side core and the R/W center core, and an R/W gap (8). Also, E head core (3)
is an E-side core made of ferromagnetic material such as ferrite (
10), E center core (11), glass welding part (12) that fixes E side core and E center core, and E
It consists of a gap (13).

Next, a manufacturing method for obtaining a head chip having the structure shown in FIG. 15 will be explained with reference to FIGS. 16 to 22. FIG. 16 shows the R/W head core block (50),
The gap abutting surfaces of the /W side core block (51) and R/W center core block (52) are mirror-polished, and then a
A gap spacer such as an i02 sputter film is formed, and the apex portion (53) and the rear portion are welded with glass while facing each other and under pressure to form a welded glass portion (54). (
8) corresponds to the R/W gap.

FIG. 17 shows a state in which narrow track grooves have been machined on all four R/W head cores. Using a diamond blade or the like, narrow track grooves (55) and (5B) are formed at a predetermined pitch P to a desired track width. Process so that TW (R/W) remains. At this time, the depth of the groove is set to narrow track machining groove (55 mm).
), (56) is machined to a depth that is deeper than the apex (53). That is, the groove extends from the surface (57) facing the E-head core, crosses the magnetic gap and ends at the sliding surface (58) with the medium, and also extends from the welded portion (54) of the apex portion.
).

Next, as shown in FIG. 18, the R/W head core block (50) and the E head core block (60) processed in the same manner as the R/W head core block (50) are assembled into a plurality of blocks including at least two blocks at both ends. R/W and E: are made to face each other via a 2-a spacer (70) while maintaining a desired core-to-core pressure @D2, and the joint portion is temporarily fixed with an organic adhesive or the like.

At this time, IJ adjustment, that is, mutual position adjustment of the R/W and E) racks is performed so that the center line C1 of the R/W track and the center line JC2 of the two E tracks coincide. Next, as shown in the cross-sectional view of Fig. 19, the R/W
A glass rod (80) is placed in the upper part of the gap between the opposing surfaces of the head core block (50) and the head core block (60) under pressure so that the mutual positions of the head core block (60) do not deviate. In this state, the entire body is heated and maintained to melt the glass rod (80), and as shown in the cross-sectional view of FIG. ) and forms a glass welded part (81). Next, as shown in FIG. 21, the excess glass portion (82) is removed by grinding or abrasive processing, etc., and then it is sliced with a cutter to the desired thickness as shown by the dashed line (83). A head chip (1) shown in FIG. 22 is obtained. Another chain! (
By slicing along the lines 84), the head chip shown in FIG. 15 is obtained.

[Problem that the invention seeks to solve]

The spacer (70) shown in Figure 18 is originally unnecessary for the completed head chip, but is necessary for the manufacturing process, and also magnetically separates the RAD core and E head core from each other in the R/W. Because it has a glass mold m (D2), the thickness of the R/W center core and the E center core is correspondingly thinner, and the cross-sectional area of the R/W center core and the E center core is reduced. There was a problem.

This invention was made to solve the above-mentioned problems, and it is possible to reduce the time required to manufacture the spacer, and to maintain the distance that magnetically separates the R/W head core and the E head core from each other. The object of the present invention is to provide a method for manufacturing a composite head chip that can secure the tli plane FA of the center core and the E center core. - [Means for solving the problem] A composite head chip according to the present invention has a first center core and a first side core facing each other through a first magnetic gap, and uses a first glass material in a first apex part. a step of welding the second center core and the second side core to each other through a second magnetic gap to form a first head core block, and welding the second center core and the second side core at the second apex using a second glass material to form the second head core block; the step of forming a core block, from the first opposing surface of the first center core of the first head core block, which faces the second center core of the second head core block, across the first magnetic gap, to the first sliding surface; A step of regulating the track width of the first head core by providing a first groove reaching the end and the welded part of the first apex part, and opposing the second center core of the second head core in the first center core of the first head core. The step of providing a third groove diagonally cutting out the track of the first groove on the first opposing surface is to ensure a distance to magnetically separate the first rad core and the second head core, and the second center of the second head core block. From the second opposing surface facing the first center core of the first core in the core to the second
a step of regulating the track width of the second head core block by providing a second groove that crosses the magnetic gap and ends at the second sliding surface and reaches the welded part of the second apex part; The first herad core in the core, the first
providing a fourth groove diagonally cutting out the track of the second groove on the second opposing surface facing the center core to ensure a distance to magnetically separate the first rad core and the second head core;
A process of aligning the first center core of the first head core block and the second center core of the second head core block, and positioning each sliding surface of both the aligned heads. A step of supplying a third glass material from both sliding surfaces while holding the head core blocks upward and molding the first, second, third, and fourth grooves of both head core blocks, thereby fixing both head core blocks. , and a step of cutting out a composite head chip from both head core blocks that are fixed together.

[Effect]

In this invention, as a means to ensure a distance that magnetically separates both head cores, the mutually facing surfaces of the center cores of both heads are cut out diagonally, and glass is molded in the gap, which is different from the manufacturing method of the prior art. This eliminates the need for a spacer, and because the glass mold part that secures f4, the distance that magnetically separates both heads, is oblique, it is possible to increase the thickness of the center core. The area increases, making magnetic saturation less likely to occur even when used in a strong magnetic field. In addition, the groove machining for this purpose is
It is more effective in terms of productivity and accuracy because it can be processed simultaneously with the same machine as groove processing with track width restrictions.

[Embodiments of the invention]

FIG. 1 shows a composite head chip obtained by the manufacturing method of the present invention. In the figure, head chip (1)
consists of an R/W rad core (2), an E/X rad core (3), and a glass welded part (4) for magnetically separating them from each other and mechanically joining them together.

R/W side core (5), R/W center core (6), glass welded part (7) made of ferromagnetic material such as
, and rad core (2) to R/W with R/W gap (8).
) is configured. In addition, an E side core (10), an E center core (1, 1) made of ferromagnetic material such as ferrite,
E at the glass weld (12) and E gap (13)
The head core (3) is configured.

FIG. 2 is an enlarged view of the track portion of this head chip from the sliding surface, and shows that the distance gI04 for magnetically separating the R/W head and the E head is the distance of the conventional head @D2.
Unlike, it is formed diagonally.

Next, an embodiment of a method for manufacturing a composite head chip according to the present invention will be explained in order of steps. Figure 3 shows the R/W head core block, and the R/W side core (51) and R/W head core block.
The gap abutting surfaces of the W center core (50) were polished to a mirror finish, and a non-magnetic gap spacer such as a 5i02 sputtered film with a thickness corresponding to the R/W gap length was formed thereon, facing each other and pressurized. In this state, the apex portion (53) and the rear portion are glass welded using the first glass material to form a glass welded portion (54). (8) corresponds to the R/W gap. The difference from the manufacturing process of the prior art shown in FIG. 15 is D.
The thickness of both or one of the R/W center core and the E center core is increased by a dimension corresponding to 2.

FIG. 4 shows the process of notching a narrow track groove for regulating the tetragon width TW (R/W) in the R/W head core block (5o). Using a diamond blade or the like, the narrow track grooves (55) and (56) are machined at a predetermined pitch P1 so that a desired track width TW (R/W) remains. At this time, narrow track machining grooves (55), (5
6) is processed so as to extend from the opposing surface of the E-head core across the magnetic gap (8), end at the sliding surface (58) of the medium, and reach the welded portion (54) of the apex portion (53).

Figure 5 shows V-shaped grooves (71) and (72) in the R/W core block to ensure the distance @04 shown in Figure 1, which magnetically separates the R/W head and E head from each other. Narrow track machining grooves (55) and (56) of (50) are machined.

Figure 6 shows the E head core block and the E side core (
The gap abutting surfaces of the E center core (61) and the E center core (62) were polished to a mirror finish, and a nonmagnetic gap spacer of 5i02 sputtered film with a thickness corresponding to the E gap length was formed thereon, facing each other and pressurized. In this state, the apex portion (63) and the rear portion are glass welded using a glass material to form a glass welded portion (64). (13) corresponds to the E gap. °The difference from the manufacturing process of the prior art shown in Fig. 15 is D.
The thickness of both or one of the R/W center core and the E center core is increased by a dimension corresponding to 2.

FIG. 7 shows the process of cutting out narrow track grooves for regulating the track width TW (E) and the tunnel width D1 in the E head core block (60).

Narrow track N (E!5) using a diamond blade etc.
).

(66) and (67) are processed to form a desired track width, TW(E), and tunnel width D1 at a predetermined pitch P2. At this time, a narrow track machining groove (65) is formed.

(eel, (67) goes from the opposite surface of the R/W core to the magnetic gap (13), and ends at the sliding surface of the medium.
And it is processed so as to reach the welded part (64) of the apex part (63).

FIG. 8 shows a figure-7 groove (73) in the tunnel width of the E core block (60) to ensure the distance glD4 shown in FIG. 1 for magnetically separating the R/W head and the E head from each other. D
1 into a narrow track groove (66).

Subsequently, as shown in FIG. 9, the R/W core block (50) and the E core block (60) made in the above process are
R/W) The center line C1 of the rack and the center line C2 of the two E tracks are adjusted so that they match, and the facing joints of the head core blocks are temporarily fixed with adhesive.

FIG. 10 is a view of the track portion of the block temporarily fixed in the step of FIG. 9, viewed from the medium sliding surface side.

Next, as shown in FIG. 11, with the medium sliding surface facing upward, the R/W head core block (50) and the E head core block (60) are placed so as not to be misaligned with each other.
Place the glass rod (80) for molding in the center of both cores while maintaining uniform pressure, and in this state, raise and maintain the temperature of the whole to melt the glass rod (80), and form the narrow track groove and both heads. A glass welded portion (81) is formed in the space provided for magnetically dividing the glass. Also, at this time, an extra glass welded part (82) is formed on the medium sliding surface side, so this is deleted.

Subsequently, as shown in FIG. 13, the head chips shown in FIG. 14 are obtained by slicing at a pitch P along the dashed line (83) with a cutter having a desired thickness.

Furthermore, the composite head chip (1) shown in FIG. 1 is obtained by slicing along the dashed line (84) shown in FIG. 14.
get.

In the above embodiment, as shown in FIGS. 5 and 7, grooves were provided in the R/W to ensure a distance for magnetically separating the RAD core and the E head core. /W
Of course, it may be provided on either the Herad core or the E-head core.

〔Effect of the invention〕

As explained above, the present invention allows a first center core and a first side core to face each other via a first magnetic gap, and welds the first center core and the first side core using the first glass material at the first apex part.
forming a first head core block whose surface having a magnetic gap serves as a first sliding surface with the magnetic medium; and forming a second apex portion by making the second center core and the second side core face each other via the second magnetic gap. welding using a second glass material, and the surface having the second magnetic gap forms a second contact with the magnetic medium.
a step of molding a second head core block that becomes a sliding surface;
Welding of the first center core of the first head core block from the first opposing ml facing the second center core of the second head core block, across the first magnetic gap, and ending at the first sliding surface and the first apex. a step of regulating the track width of the first head core block by providing a first groove reaching the first center core of the first center core, a track on a first opposing surface facing the second center core of the first center core, and a first sliding groove; A step of providing a third groove that starts at the dynamic surface and ends at the rear of the core and is cut out diagonally to ensure a distance that magnetically separates the first radial core and the second head core from each other; From the second opposing surface facing the first center core of the first head core block in the center core to the second
beyond the magnetic gap, ending at the second sliding surface, and ending at the second sliding surface.
providing a second groove reaching the welded portion of the apex portion to regulate the track width of the second head core block; a step of providing a fourth groove that starts from the second sliding surface, ends at the rear of the core, and cuts out the track diagonally to ensure a distance that magnetically separates the first rad core and the second head core from each other; A process of aligning the first center core of the head core block and the second center core of the second herad core, positionally aligning each sliding surface of both the aligned head core blocks. The third glass material is supplied from the sliding surface while the glass material is held facing upward, and the third glass material is supplied from the sliding surface to the first glass material of both head core blocks. Second. 3. Since the process of molding the fourth groove and fixing both head core blocks together, and the process of cutting out a composite head chip from both head core blocks that are fixed together, the manufacturing method according to the prior art This eliminates the need for a spacer, and the glass mold part that secures the distance that magnetically separates both heads is slanted, making it possible to increase the thickness of the center core and making it possible to cut the center core. The area increases, making magnetic saturation less likely to occur even when used in a strong magnetic field. Further, since the groove machining for this purpose can be performed simultaneously with the groove machining for restricting the track width using the same machine, it has the effect of increasing productivity and effectiveness in terms of accuracy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a composite head chip obtained according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a track portion of this head chip. 3 to 14 are diagrams for explaining the manufacturing method according to an embodiment of the present invention in the order of steps.
~Figures 9 and 13. FIG. 14 is a perspective view, FIG. 10 is an enlarged view of the track portion in the step of FIG. 9, and FIGS. 11 and 12 are cross-sectional views. FIG. 15 is a perspective view showing the structure of a composite head chip obtained by a conventional manufacturing method, and FIGS. 16 to 22 are diagrams showing a manufacturing method for obtaining a conventional head chip. 18, 21 and 22 are perspective views, and FIGS. 19 and 20 are sectional views. In the figure, (2) is the R/W RAD core, (3) is the E head core, (4) is the glass weld, (6) is the R1W center core, (11) is the E center core, and (8) is the R/W center core. W
Gap, (13) is E gap, (71), (72)
, (73) is a V-shaped groove, and D4 is the distance between the R/W head chip and the E head chip. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure 1 Z Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure n+ Figure 9 Figure 10 Figure 11 Figure 1z Figure 8 Figure 13 Figure 14 Figure 15 Figure 18 t Figure 1q (to) L) 1 Figure 20 Figure 21

Claims (1)

[Claims] A first center core and a first side core are opposed to each other via a first magnetic gap and welded using a first glass material at a first apex part, and the surface having the first magnetic gap is in a first sliding position with the magnetic medium. A step of forming a first head core block serving as a surface, a step of forming a second center core and a second side core facing each other via a second magnetic gap, and forming a second head core block in a second apex portion.
a step of welding using a glass material to form a second head core block whose surface having a second magnetic gap becomes a second sliding surface with the magnetic medium; A first groove is provided from the first opposing surface facing the second center core of the head core block, across the first magnetic gap, and ending at the first sliding surface and reaching the welded part of the first apex part. The step of regulating the track width of the block, the step of regulating the track width of the first head core block in the second center core of the second head core block
The track width of the second head core block is increased by providing a second groove that extends from the second facing surface facing the center core, crosses the second magnetic gap, ends at the second sliding surface, and reaches the welded portion of the second apex portion. a regulating step, a step of providing third and fourth grooves to provide a gap between the first center core of the first head core block and the second center core of the second head, and a step of providing the first center core of the first core block and the second center core of the second head. A step of aligning the second center cores of the second core blocks and aligning them between both head core blocks. A step of fixing both head core blocks together by supplying a third glass material from the sliding surface and molding the first, second, third, and fourth grooves of both head core blocks, and both head cores fixed together. A method for manufacturing a composite head chip, which includes a step of cutting out a composite head chip from a block.