JPS6363964B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic heads, and more particularly to magnetic heads having laminated coils.

The present inventor previously developed a laminated chip type laminated coil for a magnetic head. FIG. 1 generally shows a magnetic head, where 1 is a yoke and 2 is a coil for applying or detecting signals for recording and reproduction. FIG. 2 is a plan view of a coil for a magnetic head previously proposed by the present inventor, in which 3 is the laminated coil body, 4, 5
is an external terminal. The main body 3 is an alternately laminated body of magnetic layers and spiral printed conductors 6, the conductors 6 extending from one layer to another of the magnetic layers to form a coil pattern as a whole, and both ends 7 and 8 are connected to the outside. terminal 4,
5 respectively. A receiving hole 9 penetrating the magnetic layer is formed in the center to receive a magnetic yoke (see FIG. 1). However,
It was found that the characteristics of this laminated coil were not good.
In other words, since there is a magnetic part inside the coil conductor 6, even if an excitation current is applied from the outside, a considerable amount of magnetic flux will not flow through the yoke, and a closed magnetic circuit will be formed from the inside magnetic part to the outside magnetic part. make. Conversely, when detecting the magnetization of a magnetic tape or the like using a yoke, the magnetic flux passing through the yoke is not completely picked up by the coil.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic head equipped with an efficient laminated coil for a magnetic head. The laminated coil for a magnetic head of the present invention is formed by connecting layers one after another so as to create a spiral in the lamination direction using a printing method. dielectric materials are also available) are printed or laminated using a sheet method. At this time, the inside of the coil becomes a non-magnetic material layer, and the outside becomes a magnetic material layer. A yoke receiving hole passing through the center of the non-magnetic part of the thus obtained laminate is then fired, and an integrated laminate is obtained.
An external terminal film is baked onto this to connect it to both ends of the coil. This laminated coil has good coupling of the magnetic head to the yoke and is efficient.

3 to 14 show a method of manufacturing a laminated coil for a magnetic head according to the present invention. In the following explanation, the nonmagnetic material used is a paste made by binding insulating or dielectric ceramic powder such as Al ₂ O ₃ , TiO ₂ , BaTiO ₃ with a suitable binder such as butyral resin, and this is printed by a printing method. The layer shall have a predetermined shape. A sheet method (a method in which sheets of the above paste are laminated in advance) is also possible, but
The following explanation is limited to printing methods. The magnetic layer is obtained by printing a paste made of magnetic ferrite powder having insulating properties. Although a sheet method is also possible, the following example will be limited to a printing method. The conductor for the coil is obtained by printing a paste of powder such as Ag-Pd or Pd in a predetermined spiral pattern. In addition, external terminals include Ag, Cu,
It is formed by applying a paste of powder such as Ni and baking it at a relatively low temperature.

In FIG. 3, a rectangular non-magnetic layer 10 having an outer circumference approximately corresponding to the circumferential position of the coil is printed on a suitable substrate (not shown). Next, as shown in FIG. 4, a magnetic layer 11 having rectangular inner and outer contours is printed so as to partially overlap the outer periphery of the non-magnetic layer 10. Moving on to the process shown in FIG. 5, the conductor 13 is printed so as to partially overlap the non-magnetic layer 10. At this time, the lead end 14 of the conductor is connected to the magnetic body 11
expose on the left side of In the process shown in FIG. 6, a nonmagnetic layer 15 is printed that is aligned with the lower nonmagnetic layer 10 to the left of the center. In the process shown in Figure 7, the lower magnetic body 1
A magnetic layer 16 of a size that exactly overlaps the left half of the magnetic layer 16 is printed, and the non-magnetic layers 10 and 15 are printed in the process shown in FIG.
A U-shaped conductor 17 connected to the conductor 13 is printed so as to partially cover the outer periphery of the conductor 13. In the process shown in FIG. 9, a nonmagnetic layer 18 of a size that exactly overlaps the right half of the lower nonmagnetic material 10 is printed. In the process shown in FIG. 10, a magnetic layer 19 having exactly the same size as the right half of the lower magnetic layer 11 is printed. Moving to the step shown in FIG. 11, a substantially L-shaped conductor 20 connected to one end of the conductor 17 is printed so as to cover the nonmagnetic layers 15 and 18, and its end 21 is drawn out to the right side of the laminate.
In the process shown in FIG. 12, a non-magnetic layer 22 with the same dimensions as the non-magnetic layer 10 is printed in the center, and then a magnetic layer with the same shape and dimensions as the magnetic layer 11 in FIG. 4 is printed as shown in FIG. Print body layer 23 to complete the entire lamination. Since the laminate obtained in the above steps is a raw product before firing, the yoke receiving hole 24 can be easily formed in the non-magnetic material portion using a punch. Finally, after firing at a required temperature, external terminals 24 and 25 are formed by applying or baking conductive paste on both left and right sides as shown in FIG. It will be clear that these external terminals 24, 25 are also connected to the ends 14, 21 of the coil, respectively.

When the laminated coil manufactured as described above is attached to a yoke as shown in Figure 1 and used as a magnetic head, the spiral conductive pattern forming the coil body does not have any magnetic material inside, so it can be attached to the yoke of the magnetic head. The induced magnetic flux can completely interlink with the coil body, or conversely, the magnetic flux resulting from the current flowing through the coil can completely pass through the yoke, so that it can operate as an excellent magnetic head without loss.

In addition to the above, according to the present invention, a coil for a magnetic head can be manufactured only by lamination technology, so the process is integrated, a large number of coils can be manufactured simultaneously in parallel, and the resulting coil has a monolithic structure. Furthermore, since the external terminals are also directly bonded to the laminated coil, benefits such as convenient connection to external circuits can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the general structure of a magnetic head, FIG. 2 is a plan view of a coil for a magnetic head according to the invention of the prior application, and FIGS. 3 to 14 are manufacturing of the coil for a magnetic head of the present invention. Each sequential step of the method is shown, and the left side of FIGS. 3 to 8 is a plan view of each intermediate product, the right side is an end view, FIGS. 9 to 13 are plan views of the intermediate product at each stage, and FIGS. The figure is a completed plan view of the magnetic head coil of the present invention.
The main parts in the figure are as follows. 10, 15, 18, 22: non-magnetic layer, 11,
16, 19, 23: magnetic layer, 24, 25: external terminal.

Claims (1)

[Claims] 1 The outer part of the spirally formed conductive pattern is composed of a laminate of magnetic layers, the inner part is composed of a laminate of non-magnetic layers, and each winding layer of the conductive pattern is made of a laminate of magnetic layers. Or a magnetic head, which is separated by a non-magnetic layer or both, and a through hole is provided in the laminated body of the non-magnetic layer, and a yoke of the magnetic head is inserted into the through hole.