JP2646746B2 - Magnetic head and method of manufacturing the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-type magnetic head having a metal magnetic core suitable for efficiently recording and reproducing signals.

2. Description of the Related Art In recent years, systems for handling wideband signals such as high-definition VTRs and digital VTRs have been actively developed, and recording media have been increasing in the trend of high-density recording of such a large amount of information. There is a shift from iron oxides to high coercive force media such as alloy powders and metallized films. On the other hand, the ferrite head has a saturation magnetic flux density of about 5000 gauss at most, and for the high coercive force medium with H _C of 1000 O _C or more, the tip of the gap is saturated and sufficient recording is not possible. Can not. Therefore, a ring-type magnetic head having a configuration as shown in FIGS. 6 and 7 using a metallic magnetic material such as sendust or amorphous magnetic alloy having a high maximum magnetic flux density has been developed. In this configuration, the metal magnetic core 22 is sandwiched between non-magnetic substrates 23, and they face each other via a non-magnetic film 24 forming a magnetic gap. 27 is a winding window and 28 is a metal thin film.
Here, the metal thin film 28 has a function of electrically connecting two magnetic cores facing each other via a gap film in order to prevent electrostatic noise generated on the head surface due to sliding with the recording medium.

Problems to be Solved by the Invention FIG. 8 shows a method of manufacturing a head having a structure as shown in FIG. First, a metal magnetic film 30 is formed on a non-magnetic substrate 29 by sputtering, etc.
A pair of core blocks 32 in which metal magnetic films and non-magnetic substrates are alternately laminated are formed by bonding and cutting with a method such as the above. One of the pair of core blocks forms a winding window 33,
On the other side, after forming a bonding glass groove 34, a glass reservoir 35 for placing a bonding glass rod is formed,
Pour glass 38 into those grooves. Thereafter, the gap surface 36 of both core blocks is polished to a mirror surface, a non-magnetic thin film such as glass is formed to a predetermined thickness, butted and bonded with a bonding glass, and the surface opposite to the surface that becomes the sliding surface of the magnetic recording medium is formed. A metal block 37 of about 1 μm thick such as Cr is formed by a method such as sputtering or vapor deposition to obtain a core block 39. Thereafter, the magnetic head shown in FIG. 6 is manufactured by cutting the recording medium at a predetermined thickness and tape lapping the sliding surface of the recording medium. In such a magnetic head, as shown in FIG. 9, when the glass in the glass reservoir 25 is cracked 40, the above-mentioned metal thin film 28 is also damaged, and electrical conduction between both cores may be lost. Occur. The head having the structure shown in FIG. 7 is manufactured without inserting the glass reservoir 35 and the bonding glass groove 34 in FIG. 8 described above. When the metal thin film 28 is formed on the step A generated when the two core blocks are bonded as shown in FIG. 3, there is a difference in the film thickness between the plane parallel to the gap plane and the plane perpendicular to the gap plane. At the portion 42, the electrical conduction between the two cores is lost.
Moreover, since there is no bonding glass for strongly bonding the two cores, there has been a problem that the strength of the cores is small and the production yield is deteriorated.

Means for Solving the Problems In order to solve the above problems, the present invention provides a ring-shaped magnetic head having a structure in which a magnetic core made of a metal magnetic material is sandwiched from both sides by a non-magnetic substrate, One of the magnetic core and the non-magnetic substrate half has a winding window formed therein, and the other has a groove into which a joining member is poured, and the magnetic cores are electrically connected to each other. A conductive resin film is formed on the surface opposite to the surface facing the recording medium so as to be electrically connected to the metal magnetic material.

Further, the method of manufacturing a magnetic head according to the present invention includes forming a metal magnetic film on a non-magnetic substrate, and then stacking and bonding a plurality of the magnetic magnetic films to cut a pair of cores in which the metal magnetic film and the non-magnetic substrate are alternately laminated. After making a block, forming a winding window in one of them, forming a groove into which the joining member is poured, and polishing the gap surface of both core blocks to a mirror surface, and a non-magnetic thin film on the gap surface After forming a predetermined thickness, butted and adhered to each other, a conductive resin film is formed on the surface opposite to the sliding surface of the recording medium, and then cut to a predetermined thickness. is there.

Action The present invention has the above-described configuration, and the glass is flowing into the glass groove, so that the magnetic core is more firmly joined, and even if the glass is cracked, the conductive resin is conductive without cracking due to the flexibility of the conductive resin. Is kept. Also, even when there is a step in both core blocks, by applying a conductive resin by screen printing or the like, the step is covered over the entire surface without reducing the film thickness, so that conduction between both cores can be obtained.

Embodiment FIG. 1 shows a perspective view of a first embodiment of the head of the present invention. In FIG. 1, reference numeral 1 denotes a magnetic core made of a metal magnetic film such as a Co-based amorphous alloy or a sendust alloy, which is sandwiched between non-magnetic substrates 2 such as a calcium titanate-based ceramic. The two magnetic cores facing each other via the non-magnetic film 3 as a magnetic gap are joined by a bonding glass 4, and silver, copper, nickel, etc. formed on the surface of the head opposite to the surface facing the magnetic recording medium. The conductive resin film 5 made of a synthetic resin and a conductive filler such as a metal or carbon is electrically connected to each other.

A method of manufacturing the magnetic head shown in the first embodiment will be described with reference to FIGS. 2 (a) to 2 (d). First, second
As shown in FIG. 1A, a metal magnetic film 9 is formed on a non-magnetic substrate 8 by sputtering or the like, and a plurality of these are stacked, bonded and cut with a crystallized glass 10 or the like, so that the metal magnetic film and the non-magnetic substrate are separated. A pair of core blocks stacked alternately
Make 11,12. Next, as shown in FIGS. 2 (b) and 2 (d), one of the pair of core blocks forms a winding window 13 and the other has a joining member such as a cylindrical bonding glass rod from a predetermined position. The glass placing groove 14 to be installed without movement is formed leaving the dimension D, and the glass groove 15 into which the glass flows is formed. Next, as shown in FIG. 2 (c), after the bonding glass 16 is poured, the gap surfaces of both core blocks are polished to a mirror surface, and a non-magnetic film such as glass is coated with a predetermined film on at least one of the two gap surfaces. A conductive resin film 18 having a thickness of about 5 μm to 30 μm is formed on the surface opposite to the surface 17 serving as the sliding surface of the magnetic recording medium by a method such as screen printing or a transfer method. Then, a core block 19 as shown in FIG. 2 (d) is obtained. Thereafter, this is cut to a predetermined thickness, and the surface 17 serving as a sliding surface is tape-wrapped, thereby forming the first surface.
The magnetic head shown in the figure is manufactured.

With reference to FIGS. 1 and 2, it will be described with reference to FIGS. 1 and 2 that the magnetic head thus configured can eliminate the conduction failure caused by the crack 40 in the glass of the conventional example shown in FIG.

In FIG. 1, even if cracks occur in the bonding glass 4, only a crack occurs in the glass portion B of FIG. 2C shown in the manufacturing process shown in the manufacturing process, and the magnetic core and the non-magnetic substrate are stronger than glass. Does not occur in the portion C including For this reason, the conductive resin film 5 can secure conduction between the two cores in the portion C.

Next, a perspective view of a second embodiment of the present invention is shown in FIG.
The head according to the present embodiment has a configuration without the glass placing groove 7 shown in FIG. 1 shown in the first embodiment, and the manufacturing method thereof is such that after the process of FIG. By using glass to prevent the glass from moving or falling, the glass placing groove 14 in FIG. 2 (b) is not formed,
Subsequent parts are manufactured in the same manner as in the first embodiment.
According to this method, since the number of manufacturing steps is smaller than that of the first embodiment, it is easily and firmly joined by the bonding glass 4,
It is possible to manufacture a head having a magnetic core with conduction between both cores. FIG. 4 shows an installation example of the cylindrical bonding glass rod 20 of the first embodiment, and FIG. 5 shows an installation example of the rectangular bonding glass rod 21 of the second embodiment.

Effect of the Invention According to the present invention, a conductive resin film that electrically connects two magnetic cores facing each other via a gap film is formed on a surface opposite to a recording medium facing surface, thereby enabling sliding with a recording medium. As a result, electrostatic noise generated on the head surface can be prevented, and good reliability can be obtained with a simple configuration. Further, according to the manufacturing method of the present invention, since the processing for forming the conductive resin film is performed by screen printing or the like on the core block to which a large number of magnetic cores are adhered, the film can be formed on many heads by one processing. The processing cost per head can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the magnetic head of the present invention, FIG. 2 is a perspective view showing a method of manufacturing the magnetic head of the present invention, and FIG. 3 is a second view of the magnetic head of the present invention. FIGS. 4 and 5 are side views showing a method of manufacturing a magnetic head according to the present invention, FIGS. 6 and 7 are perspective views showing a conventional magnetic head, and FIG. 9 and 10 are side views showing a main part of a conventional magnetic head. 1 ... magnetic core, 2 ... non-magnetic substrate, 3 ... non-magnetic film,
4 ... bonding glass, 5 ... conductive resin film, 6 ...
... winding window, 7 ... glass-placed groove.

Claims (2)

(57) [Claims] In a ring type magnetic head having a structure in which a magnetic core made of a metallic magnetic material is sandwiched between nonmagnetic substrates from both sides, one of the magnetic core and the nonmagnetic substrate half opposed to each other via a gap is provided on one side. A winding window is formed, and a groove into which a joining member is poured is formed on the other side, and the magnetic core is electrically connected to each other. A magnetic head comprising a conductive resin film formed by conduction. 2. After forming a metal magnetic film on a non-magnetic substrate,
By stacking a plurality of sheets and bonding and cutting, a pair of core blocks in which a magnetic metal film and a non-magnetic substrate are alternately stacked are produced, one of which is formed with a winding window, and the other is poured with a joining member. After forming the groove, the gap surface of both core blocks is polished to a mirror surface, a non-magnetic thin film is formed to a predetermined thickness on the gap surface, and then adhered to each other, and further bonded to the surface opposite to the recording medium sliding surface. Forming a conductive resin film,
Thereafter, this is cut to a predetermined thickness.