JPS5928514Y2 - Composite magnetic head - Google Patents

Description

[Detailed explanation of the invention] This invention was developed to improve the bonding strength between the head chip and the back core in a composite magnetic head, to prevent bonding slippage, and to improve weather resistance, uneven wear characteristics, electrical properties, etc. The purpose is to provide a magnetic head.

Figures 1 to 4E are for explaining a conventional composite magnetic head. 1 is a head chip that is made of a wear-resistant material such as sendust and serves as a tape sliding surface, and 2 is a back core that joins this head chip 1, and this has high magnetic permeability.

It is also made by laminating thin plates such as permalloy.

3 is the bonding surface between the head chip 1 and the back core 2, which is bonded at high temperature with an adhesive or the like; There is a drawback that the bonding strength becomes weaker and the narrower the core width, that is, the track width W, is, the weaker the bonding strength becomes.

Furthermore, when joining the head chip 1 and the back core 2, it is difficult to eliminate the deviation in the direction of the track width W, and this deviation causes crosstalk, which impairs the performance of the magnetic head. It was also the cause of the decline.

Additionally, this configuration has the disadvantage that the exposed surface of the molded resin is uneven, which causes uneven wear of the magnetic head and shortens its life.

FIG. 4 is a diagram showing the completed assembly of a conventional composite magnetic head. In the figure, 4 is the aforementioned composite core, 5 is a shield plate, 6 is a sendust dummy, 7 is a shield case, and 8
is mold resin.

This invention has been developed to eliminate these conventional drawbacks, and will be described below with reference to the embodiment shown in FIGS. 1 to 4.

Among the reference numerals shown in FIGS. 5 to 11 and the reference numerals shown in FIGS. 1 to 4, the same reference numerals indicate the same parts.

This idea (the main part of this composite magnetic head is that when the composite core 11 is made, the side plate 9 made of a non-magnetic conductor such as phosphor bronze or titanium is exposed on the tape sliding surface). This is arranged on at least one side of the joint between the head chip 1 and the back core 2.

The material of this side plate 9 is the head chip 1.
It is desirable to have a hardness close to that of .

As shown in FIGS. 6 and 7, by arranging the side plate 9 by adhesive or other means on one side, the area is approximately three times larger than the joint surface 3 of the conventional composite core 4. Furthermore, the bonding strength due to the pressure applied in the A and B directions is approximately 2.5 times or more greater than that of the conventional method.

This means that if the side plates 9 are arranged on both sides as shown in FIG. 9, the width of the bonding surface will be approximately five times as large, and the bonding strength will also be five times as large.

Furthermore, since the side plate 9 is placed against at least one side of the joint between the head chip 1 and the back core 2, the side plate 9 is used as a reference plate before the above joining. , it is possible to reduce and equalize the bonding deviation between the head chip 1 and the bank core 2 in the direction of the track width W, thereby reducing crosstalk.

FIG. 8 shows a composite magnetic head assembled using a side plate 9 disposed on one side of a composite core 11, and in the figure, 10 represents a magnetic tape.

FIGS. 10 and 11 show another embodiment of a composite magnetic head assembled using side plates 9 disposed on both sides of a composite core 11. FIG.

The idea was to construct such a composite magnetic head (by making the track width uniform when the head chip and back core were bonded together (thus reducing crosstalk, and increasing the bonding strength between the two). This improves weather resistance and reduces the risk of the head chip and back core coming off during the magnetic head manufacturing process.In addition, the side plate made of non-magnetic conductive material protects the sliding surface of the magnetic tape. This reduces the exposed surface of the molding resin, preventing uneven wear of the magnetic head and preventing the magnetic material of the magnetic tape from adhering to the tape sliding surface of the magnetic head. Since the plate is a non-polar conductor, it also serves to reduce leakage magnetic flux at the joint surface between the head chip and the back core, and has the advantage of making it possible to obtain a magnetic head with excellent electrical characteristics.

[Brief explanation of the drawing]

Figures 1 to 4 relate to a conventional composite magnetic head. Figure 1 is an exploded perspective view of the head chip and back core, Figure 2 is a perspective view showing their bonded state, and Figure 3 is an exploded perspective view of the head chip and back core. The side view and FIG. 4 are perspective views of a composite magnetic head assembled and completed using this composite core. Figures 5 to 11 are related to the composite magnetic head E of this invention. Figure 5 is an exploded perspective view of the head chip, bank core, and nid plate, and Figure 6 shows the state in which these are joined. 9 is a side view thereof, FIG. 8 is a perspective view showing an embodiment of a composite magnetic head assembled using this composite core, and FIG. 9 is a perspective view showing side plates on both sides (this A perspective view of the disposed composite core, and FIGS. 10 and 11 are perspective views of a composite magnetic head showing another embodiment of this invention assembled using this composite core.1. ... Head chip, 2 ... Back core, 3 ... Joint surface, 9 ... Side plate, 11 ... Composite core.

Claims (1)

[Scope of utility model registration request] A composite magnetic head is constructed by joining a head chip made of Sendust with a tape sliding surface and a back core made of permalloy. A composite magnetic head, characterized in that the composite magnetic head is disposed on at least one side of the joint between the head chip and the back core so as to be exposed on the sliding surface.