JPS5942372B2 - laminate magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminate magnetic head, and more particularly to a magnetic head composed of a 2-channel laminate core.

A laminate magnetic head consisting of a laminate core is
Since the layers are electrically insulated by adhesive, core loss is small, and it is more robust and relatively inexpensive than the ferrite type, so it is currently widely used as a magnetic head. Permalloy thin plates of 0.05 to 0.35 mm are stacked and bonded to a thickness corresponding to the track width.

However, in conventional laminated magnetic heads, the magnetic flux passes well in the direction of the laminated surfaces of the laminated thin plates, but has a property that the magnetic flux passes poorly in the direction of the thickness of the laminated surfaces.

Rolled metal plates have such properties, but in the case of laminated magnetic heads, the laminated thin plates are bonded one by one with an insulating adhesive, so there is a gap between the layers, which causes a difference in the thickness direction. ] The magnetic flux is even more difficult to pass through here. below,
A conventional example of a laminated magnetic head will be explained.

FIG. 1a is a plan view showing an example of a conventionally used one-channel magnetic head, and FIG.
FIG.

In this case, since the front cores 1a, Ib and the back core 2 are connected in the plane direction of the laminated thin plates,
The magnetic flux due to the current flowing through the coil 3 or the magnetic flux from the tape passes well. Next, a conventional example of a two-channel laminated magnetic head will be described.

FIG. 2a is a plan view showing a two-channel laminated magnetic head, and FIG. 2b is a side view of FIG. 2a.

In the case of a two-channel laminated magnetic head, as shown in FIG. 2b, the front cores Ba and 9a of the two laminated heads 8 and 9 are bonded together with a shielding plate 10 in between.

However, the U-shaped back cores 8b, 9b connected to the front cores Ba, 9a must be spaced apart from each other by as much distance as possible to allow the coils to be wound thereon. Therefore, the back cores 8b, 9b are adhered to the front cores Ba, 9a so as to overlap in the thickness direction, the back cores 8b, 9b are spaced apart, and the coil is wound around these. However, in this case, the front core Ba and the back core 8b) and the front core 9a and the back core 9b are stacked and bonded in the direction of the thickness of the thin plates, so the magnetic flux is not bent at the connecting surface of these cores. However, since it has to pass in the thickness direction in the middle, it is inevitable that the pass will be difficult. Therefore, the third
The figure shows an example in which the upper and lower laminated core heads are formed by folding a part of the front core and back core as one body, avoiding the adhesive part between the two. FIG. 3a is a plan view thereof, and FIG. 3b is a side view thereof. In this case, the laminated cores 11a and 12a of the magnetic heads 11 and 12 constituting the two-channel magnetic head have a front core and a back core that are integrated, and the laminated surfaces are bent in two steps with the laminated surfaces facing outward. each core head 11,1
The two back cores are spaced apart. If this is done, the magnetic flux can pass through only the laminated surfaces of the thin plates of the core, so the magnetic flux can flow smoothly. However, this method has the following drawbacks. (1) If the core as a whole is bent after laminating thin plates, stress will be generated inside the thin plate material due to the process, which may cause deterioration of magnetic properties and may cause the adhesion of the laminated layers to peel off.

(2) In order to avoid the generation of the above-mentioned internal stress, annealing may be performed after bending, but this is very time-consuming.

Furthermore, since there are variations in the bending angle of the laminated layers after bending, it is not possible to make the core pieces completely adhere to each other during lamination. In view of the above points, an object of the present invention is to connect each core head of a two-channel magnetic head to a pair of front cores and a pair of front cores.
It consists of a U-shaped back core and a pair of connecting cores that are located between the front core and the back core and connect them. Similarly, the connecting end surfaces of the front core and back core are sloped surfaces with an angle of inclination of 45 to the laminated surface of the core. After mirror-finishing all the sloped surfaces, The inclined surface of the front core is connected to one inclined surface of the front core so that the laminated surfaces of both are at right angles, and the inclined surface of the back core is connected to the other inclined surface of the connecting core, and the laminated surface of the back core is connected to the inclined surface of the back core. To provide a laminate magnetic head in which the laminated surfaces of the core are made perpendicular to each other, and the laminated surfaces of the front core and the back core are parallel to each other in two stages to eliminate bending.

In this way, the back cores can be configured to be separated from each other without bending the two core heads, and the magnetic flux can be passed well in the direction along the laminated surface.
Hereinafter, the present invention will be explained based on an illustrated embodiment.

FIG. 4 is a perspective view showing an embodiment of a two-channel laminate magnetic head to which the present invention is applied.

As shown in FIG. 4, an upper channel magnetic head 15 and a lower channel magnetic head 25 are constructed by adhering upper front cores 16a, 16b and lower front cores 26a, 26b with a shielding plate 20 in between. . The upper head 15 has a gap of 1 with front cores 16a and 16b.
Connecting cores 17a and 17b are bonded to the front cores 16a and 16b, respectively, and connecting cores 1
A back core 18 is bonded to 7a and 17b, and coils 21a and 21b are wound around the back core 18. Above front core 16a, 16b1 connection core 17
a, 17b and the back core 18 are all laminated cores made by stacking permalloy thin plates and bonding them together, and as shown in FIG. Connection surface 16b' between the other front core 16b and connection core 17b
and 17b' form inclined surfaces having an angle of inclination of 45 with respect to the laminated surface of the core, and these inclined surfaces 16a', 17a' and 16b', 17b' are mirror-finished and bonded to each other. This allows the direction of the laminated surface of the core to be changed. Furthermore, one connection core 17a and back core 1
Connection surfaces 17a7, 18a with 8 and the other connection core 1
Similarly, the connecting surfaces 17b7 and 18b between the back core 18 and the back core 18 form an inclined surface having an angle of 457 with respect to the laminated surface, and these inclined surfaces 17a, 18a and 17
b'' and 18b are mirror-finished and bonded to each other.

Thereby, the direction of the laminated surface of the core can be changed again to be in the same direction as the front cores 16a and 16b. That is, a U-shaped back core 18 can be used, and the coils 21a and 21b can be wound around this. It should be noted that the lower channel magnetic head 25 is also constructed in exactly the same manner as the upper channel magnetic head 15 in a vertically symmetrical manner. As described above, in the upper channel magnetic head 15 and the lower channel magnetic head 25, the front cores 16a, 16b and 26a, 26b are respectively bonded with the shielding plate 20 in between, forming a two-channel head. There is.

When a two-channel head with such a configuration is used, as for the upper head 16, the magnetic flux path formed by the front cores 16a, 16b1, the connecting cores 17a, 17b1, and the back core 18 is formed by laminated core pieces. They are connected in the direction of the laminated surfaces, and there is no path in the direction of the stacked thickness, allowing magnetic flux to pass through extremely well.

As described above, in the two-channel laminate magnetic head according to the present invention, each magnetic flux can pass through each core head well without bending, and the intended purpose can be successfully achieved.

[Brief explanation of the drawing]

FIG. 1a is a plan view showing a conventional example of a one-channel laminated magnetic head, FIG. 1b is a side view of the above-mentioned FIG. 1a, and FIG. 2a is a back core of a two-channel laminated magnetic head. FIG. 2b, a plan view showing a conventional example bonded over the front core, is a side view of FIG. 2a, and FIG.
Figure a is a plan view showing another conventional example of a two-channel laminate magnetic head, Figure 3b is a side view of Figure 3a, and Figure 4 is a two-channel laminate magnetic head showing an embodiment of the present invention. FIG. 5 is an exploded perspective view of the main part of FIG. 4. 1a, 1b, 8a, 8b, 11a, 11b, 16a, 1
6b, 26a, 26b...front core, 17a, 1
7b... Connection core, 2, 18... Back core, 8,
9, 11, 12, 15, 25...2 channel laminate head, 16a', 16b', 17a', 17b
', 17a'', 17b'', 18a, 18b... inclined surface.

Claims (1)

[Claims] 1. In a two-channel magnetic head constructed by combining a pair of laminated core heads, each core head has a pair of front cores, a U-shaped back core, and a core located between the front core and the back core. It consists of a pair of connecting cores that connect these, and the connecting end surface of the front core and back core and both connecting end surfaces of the connecting core are sloped surfaces that are inclined at 45 degrees with respect to the laminated surface of the core, and the connecting core is Glue the sloped surface of the front core to one sloped surface so that their laminated surfaces are at right angles, and glue the sloped surface of the back core to the other sloped surface of the connection core so that their laminated surfaces are at right angles. A laminated magnetic head in which the laminated surface of the front core and the laminated surface of the back core are arranged in two stages and parallel to each other.