JPS63200310A - Method for butting core block - Google Patents

Abstract

PURPOSE:To facilitate a track aligning work, to improve workability, and to obtain a core block with high quality, by forming a track groove whose track width is decreased gradually in the longitudinal direction of a core block on the junction plane of the core block. CONSTITUTION:By setting the junction planes 11a and 12a of the core blocks 11 and 12 facing upward and positioning them on a jig 21 giving little inclination, and the track groove 17 is formed so as to decrease the track width T facing to the longitudinal direction. After glass 18 and 19 being molded into a groove 17 and a V-shaped groove 13, and mirror finishing is performed, and the blocks 11 and 12 are joined through a nonmagnetic thin film 20 which functions as a spacer, then, track aligning is performed as observing its apex end face with a microscope. At this time, it is possible to set actual track width To by the gradual decrease of the track width even when a few amount of aberration occurs. Therefore, it is possible to easily perform the track aligning and to improve the workability and reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for butting the bonding surfaces of a pair of core blocks together in the manufacture of bulk type magnetic heads used in magnetic recording devices such as VTRs. be.

For example, an example of a bulk type magnetic head will be described with reference to FIGS. 5 and 6. In the figure, (1) is a bulk type core chip made of ferromagnetic material such as single crystal ferrite, and a pair of cores (2) and (3) are made of glass (4) and (5).
(5) are joined and integrated. The above core chip (
At the top end of 1), a non-magnetic material such as 5i02 serves as a gap spacer between the bonding surfaces of cores (2) and (3). (6
), a magnetic gap g is formed, and this magnetic gap g is protected from both sides with glasses (5) (5). In addition, winding locking grooves (7) and (8) are formed on the outer surface of the core (2) and (3), and grooves are formed on the inner surface of the core (3). A wire rod (10) for forming a coil is wound around the cores (2) and (3) in predetermined turns by using the winding insertion hole (9) provided by the joining and integration.

Next, by explaining the manufacturing method of the above-mentioned magnetic head, a conventional example of a method for butting core blocks will be explained in FIGS.
Description will be made based on the manufacturing steps shown in e) to FIG. 9. First, as shown in Fig. 7<a>, a pair of rectangular parallelepiped core blocks (11) made of mirror-finished ferromagnetic material.
Prepare (12). Then, as shown in FIG. 7(b) and FIG.
) (12a), a plurality of trunk grooves (17) (17) -... are pinched by dicing so that track widths (T) (T)... of a fixed size remain along the transverse direction of the trunk grooves (17) (17) -... Form by cutting. Along with forming the track grooves, a groove (13) is cut along the longitudinal direction on the inner side surface of one core block (11), and a winding locking groove (14) is cut on the outer side surface. In addition, winding locking grooves and grooves (15) (16) are cut along the longitudinal direction on the outer and inner side surfaces of the other core block (12). As shown, the track grooves (17) (17) of this core block (11) (12)
)...and V groove (13) Nigara: A (1B)
(18) ... (19) is molded. Furthermore, after this glass molding, the joint surfaces (lla) (12a) of the core blocks (11) (12) are mirror-finished, and as shown in FIG. 7(d) and FIG.
) (12a) are butted together with a special jig through a non-magnetic thin film (20) such as 5i02 that serves as a gap spacer, and in this state, the top end surfaces of the core blocks (11) and (12) are visually observed under magnification using a microscope, etc. After this alignment, the molded glass (1B> (18) is heated by heating the core blocks (11) (12).
...(19) are melted and joined together to form a magnetic gap g at the top end. As shown in FIG. 7(e), the top ends of the core blocks (11) and (12) are Curved VR! g processing, and then core blocks (11) (12) as shown by chain lines (jl) (jri...)
The core blocks (11) and (12) are sliced into predetermined thicknesses in a direction inclined at an azimuth angle with respect to the transversal direction of the core block, and the magnetic head shown in FIGS. 5 and 6 is manufactured through winding work. obtain.

By the way, in the conventional method described above, the core block (11
) When aligning the tracks in (12),
The widths of a large number of tracks exposed on the top end faces of the core blocks (11) (12) must be matched as much as possible. However, the above core block (11) (
While observing the top end surface of the core block (12) with an enlarged view,
) (12) It is difficult to adjust the relative position of the magnetic head and requires a large number of man-hours, and the work efficiency is greatly reduced.Moreover, positional deviation is likely to occur, resulting in a decrease in the quality of the magnetic head. There was a problem with lack of reliability.

. The present invention was proposed in view of the above-mentioned problems, and includes a track width formed between the track grooves in the longitudinal direction on the joint surface of a pair of rectangular parallelepiped core blocks made of ferromagnetic material. A core that solves the above problem by forming a plurality of track grooves so that the trunk width gradually increases or decreases, and then abutting the joint surfaces of the core blocks so that the directions of the trunk width gradually increasing or decreasing are opposite to each other. This is a method of matching blocks.

According to the method of the present invention, a pair of core blocks in which a plurality of trunk grooves are formed so that the track width gradually increases or decreases are butted together so that the directions of the gradual increase or decrease in the track width are opposite to each other. Therefore, the gradual increase or decrease in the track width is canceled out, and even if some positional deviation occurs when the core blocks are butted together, it is easy to set the final substantial track width to a predetermined dimension. becomes.

An embodiment of the method for butting core blocks according to the present invention will be described with reference to FIGS. 1 to 4. However, the fifth
The same parts as those in the figures to WJ9 are given the same reference numerals, and the explanation thereof will be omitted.

First, similarly to the conventional method shown in FIG. 7(a), a pair of rectangular parallelepiped core blocks (11) (
12), and as shown in Fig. 1, form trunk grooves (17°) (17°)... on the joint surfaces (11) (12) (12a) of this core plate (11) (12). For track groove formation in the method of the invention, for example, as shown in FIG.
The core block (11) is positioned and placed in a slightly inclined state with the core block (12a) facing upward, and in this state, a dicer having a grooving blade (not shown) is used to cut the core block (11) as shown in FIG.
The trunk widths (T), (T+α1), (T+
α2), (T+ff3) = (T+αn) [αi〈
A plurality of track grooves (17'') (17')... are formed so as to gradually increase or decrease as α2, α3...〈αn〉.In addition, along with the above track groove formation, the core block (11
) Cut V-grooves, winding locking grooves, and concave grooves (13) to (16) on the inner and outer side surfaces of (12).

After forming the track grooves described above, the core blocks (11) (12
) track groove (17°) (17°)... and ■ groove (
Glass (18°) (18°)...(19) is molded onto 13), and the joint surfaces (lla) (12a) are mirror-finished. After glass molding of the core blocks (11) (12), a non-magnetic thin film (20) such as 5top, which becomes a gap spacer (see Figures 3 and 4)
The core blocks (11) and (12) are butted together through the core blocks (11) and (12). The core blocks (11) and (12) are butted using a butting jig [not shown] as shown in FIGS. 3 and 4, and track width (T) (T+(rx
)(7+α2)−(T+gn) so that the directions of gradual increase or decrease are opposite to each other in the core block (11) (1
2) by butting the bonding surfaces (11a) (12'a) against each other. During this butting, the top end surfaces of the core blocks (11) (12) are track aligned while being visually enlarged with a microscope or the like. When aligning the trunks, even if some positional deviation occurs, the core blocks (11) and (12) are aligned to ensure that the truck @(T
)(T+α1)(T+α2)...(T+αn) are offset, so the actual track widths (To) (To)...
may be set to the same predetermined dimensions.

In the above-mentioned trunk groove formation, each track groove (17°) (17')...
was formed with high precision and the width of each trunk groove was set to the same size, but it is difficult to cut trunk a (17') (17')... with high precision due to wear of the groove cutting blade, etc. It is. In this case, the trunk groove may be cut by repeatedly using a narrow blade so that the trunk width is gradually increased or decreased and the trunk groove width is also gradually increased or decreased.

After the core blocks (11) and (12) are butted together, the core blocks (11) and (12) are heat welded together with a butt jig (not shown) to be joined together.

After this joining, the core block (11) is attached as in the conventional method.
The top end surface of (12) is polished into a curved surface, and then the core blocks (11) and (12) are sliced at regular pitch intervals in a direction inclined at an azimuth angle with respect to the short side direction, and further subjected to winding work. Obtain a magnetic head.

Main feature 1: According to the method of the present invention, even if a slight deviation occurs in the relative positional relationship of the core blocks during track alignment during butting of the core blocks, it is tolerated, so that it is possible to adapt to the current state of the butting work. It is possible to easily adjust the position of the magnetic head, greatly improving work efficiency, and providing a high-quality and highly reliable magnetic head.

[Brief explanation of the drawing]

1 to 4 are for explaining one embodiment of the method of butting core blocks according to the present invention, FIG. 1 is a front view showing the joining surface of the core block, and FIG. 2 is a front view of the core block. 3 is a plan view showing the butted core blocks, and FIG. 4 is an enlarged plan view of the main part of FIG. 3. FIG. 5 is a perspective view showing an example of a bulk type magnetic head;
The figure is a front view including a partial cross section of Fig. 5, and Fig. 7 (a) to (
FIG. 3e) is a perspective view showing a core block for explaining each step in the method of manufacturing a magnetic head. Figures 8 and 9 are for explaining a conventional method of butting core blocks. Figure 8 is a front view showing the joint surfaces of core blocks, and Figure 9 is a front view showing the butted core blocks. FIG. (11) (12) --- Core block, (lla)
(12a) - Joint surface, (17')...Track groove, (T) (7'+αl) -CT+crn)-
- Track width.

Claims (1)

[Claims] (1) After forming a plurality of track grooves on the joint surfaces of a pair of core blocks made of ferromagnetic material so that the track width created between the track grooves gradually increases or decreases in the longitudinal direction, A method for butting core blocks, characterized in that the joint surfaces of the core blocks are butted together such that the directions of gradual increase or decrease in are opposite to each other.