JPS58175120A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To set accurately the gap of a touch face to a magnetic tape or the like and form this gap easily, by holding many nonmagnetic particles whose diameters are uniform between a pair of cores and joining cores. CONSTITUTION:Many glass beads 5 as nonmagnetic particles are dispersed and put on the inside face of a core 1. These glass beads 5 have a high melting point and a uniform diameter. Cores 1 and 2 are allowed to opposte to each other through glass beads 5 placed between them and are pressed to hold glass beads 5 between them. Thus, even if faces of cores 1 facing each other are warped, the gap between them coincides with the diameter of glass beads 5 and is uniform in any part. In this state, a galss 6 having a low melting point is melted and packed between faces opposing to each other. Consequently, a gap (g) between cores 1 and 2 is very accurate and is produced in a simple process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for recording or reproducing information on magnetic tape or other magnetic media.

This type of device uses a thin film method such as sputtering or vapor deposition to form a non-magnetic material on one of the facing surfaces of opposing cores to form a gap on the touch surface with the magnetic tape. The core is melted and bonded with glass or the like, forming a gap with the thickness of the layer of non-magnetic material. However, the manufacturing method for forming non-magnetic objects using the thin film method is complicated and has the disadvantage that the opposing surfaces of the cores are not on the same plane due to warping or sagging, which tends to result in uneven gaps. have.

The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic head that accurately sets the gap of the touch surface to a magnetic tape, etc., and that can be easily manufactured, and a method for manufacturing the same. I'll go.

In this invention, by sandwiching a large number of non-magnetic particles with uniform spherical diameters between a pair of cores and connecting them with the corer, even if there is an error in the flatness of the facing surface of the core, the gap between each part can be reduced. By uniformly determining the diameter of the non-magnetic particles to match the diameter of the non-magnetic particles, and by using high-melting-point non-magnetic particles and melting and filling the opposite surface of the core with low-melting-point glass, the non-magnetic particles can be Furthermore, by using high melting point glass beads to set the gap between the cores and low melting point glass as an adhesive, the gap can be set accurately without melting, and the gap can be set accurately without melting. The glass beads have a high melting point and are quickly welded to prevent the low melting point glass beads from flowing into unnecessary areas and can be efficiently filled.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. First, a pair of cores (1) and (2) are provided.

Track grooves (3) on the inner surface of these cores (1) (2)
A winding groove (4) perpendicular to the K track groove (3) of one core (1) is formed. As shown in Figure 2, a large number of glass beads (5), which are non-magnetic particles, are dispersed on the inner surface of one core (1).These glass beads (5) have a high melting point. The diameter of the sphere is set uniformly. It is convenient to fix these glass beads (5) with an inorganic adhesive or the like that does not generate bubbles after hardening, since the position will be stabilized. Next, as shown in Fig. 3, the glass beads (5) are pressed together so that the cores (1) and (2) face each other, and the cores (1) and (2) are pressed in a direction toward each other to form the glass beads (5). to hold. This is K, core (1) (
Even if the opposing surfaces of 2) are warped, the opposing distance between the cores (1) and (2) is uniform, matching the diameter of the glass beads (5) no matter where you look. In this state, low melting point glass (6) is melted and filled on the opposing surface. Therefore, core (1)
(2) The gap t between them is extremely accurate, and there is no need to form a nonmagnetic layer using a thin film method on the inner surface of the core (1) to form the gap t, and it can be manufactured using a simple process. . Next, the cores (1) (2
) is cut into multiple pieces along the track groove (3), and the fourth
As shown in the figure, after the tip surfaces of the cores (1) and (2) are processed into spherical shapes, the winding grooves (4) and the K coil are wound thereon.

Next, a second embodiment of the present invention will be explained based on FIGS. 5 and 6. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, as shown in FIG. 5, a large number of glass beads (5) with a high melting point and glass beads (7) which are made of a non-magnetic material and serve as a thermosetting adhesive with a low melting point are dispersed and placed in the core (1). , on top of this, as shown in Figure 6, the core (
The glass beads (7) are melted by placing the cores (1) (2) and applying heat and pressure in the direction in which the cores (1) and (2) K approach each other. The first step and the second step are the same as in the previous embodiment. Since the glass pieces (5) and (7) are arranged in a mixed manner, when the glass piece (7) is melted, it is quickly welded to the glass piece (5) and does not flow out to an unnecessary part. This can also solve the problem of insufficient filling.

Since this invention is configured as described above, even if there is an error in flatness on the opposing surfaces of the opposing cores, the gap can be set uniformly by the spherical non-magnetic particles, and the non-magnetic particles By using a material with a high melting point and melting and filling the opposite surface of the core with glass of a low melting point, the gap can be set accurately and extremely easily without melting the non-magnetic particles. Furthermore, the gap can be more accurately determined by dispersing high melting point glass beads to set the gap between the cores and low melting point glass beads as an adhesive and applying pressure and heat to the cores. At the same time, it is possible to quickly weld the glass beads with a low melting point to the glass beads with a high melting point. Therefore, the position of the glass beads where the gap is set can be quickly fixed, and the outflow of the glass beads with a low melting point can be prevented, thereby improving the filling efficiency. This has the effect of increasing the

[Brief explanation of drawings]

FIG. 1 is a perspective view of a core showing a first embodiment of the invention;
Figure 2 is a front view showing the process of placing glass beads on one of the cores, Figure 3 is a front view showing the process of joining the opposing cores with glass, and Figure 4 is the completed state. FIG. 5 is a front view showing a second embodiment of the present invention, and is a front view showing the process of placing glass beads on one core, and FIG. 6 is a front view showing the process of joining the cores. . 1-2...core, number...winding groove, 5...glass beads (high melting point non-magnetic particles), 6...glass (low melting point thermosetting adhesive), 7... ...Glass beads (low melting point thermosetting adhesive) ``Figure 7'' LL Figure ``δ Hi'', 32 2 6 Figure

Claims (1)

[Claims] 1. A pair of opposing cores each having a winding groove in which the coil is positioned on at least one of the opposing surfaces, and a large number of high melting point non-magnetic particles with uniform spherical diameters. A magnetic head characterized in that the cores are sandwiched by opposing surfaces and bonded to each other by a low melting point thermosetting adhesive made of a non-magnetic material. 2. The magnetic head according to claim 1, characterized in that glass beads are used as the non-magnetic grains. 3. The magnetic head according to claim 1, characterized in that ceramic balls are used as the non-magnetic grains. 4. The magnetic head according to claim 1fj, characterized in that metal balls are used as the non-magnetic grains. 5. A winding groove is formed in which the coil is positioned in at least one of a pair of opposing cores, and a large number of non-magnetic particles having a uniform diameter and a high melting point are sandwiched between the cores to approach these cores. A method of manufacturing a magnetic head, characterized in that low melting point glass is melted and filled on the opposing surface of the core by applying pressure in the direction. 6. A winding groove is formed in at least one of a pair of opposing cores to position the coil, and a large number of non-magnetic particles with a uniform diameter and a high melting point and a large number of glass beads with a low melting point are placed in the core. A method for manufacturing a magnetic head, characterized in that the glass beads are melted by applying pressure and heat in an approaching direction to the core while dispersing and sandwiching the glass beads.