KR910000207B1 - Composite type magnetic head - Google Patents

Abstract

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Description

Hybrid Magnetic Head

1 is a plan view showing a magnetic core body of a composite magnetic head according to the present invention.

FIG. 2 is a plan view showing a tape sliding surface of the magnetic core body shown in FIG.

3 is a perspective view showing a magnetic core body of a conventional hybrid magnetic head.

4 is a partially enlarged view showing the tape sliding surface of the magnetic core body shown in FIG.

* Explanation of symbols for main parts of the drawings

11a, 11b, 12a, 12b: magnetic substrate 11c, 12c: metal core

13: magnetic gap

The present invention relates to a hybrid magnetic head suitable as a magnetic head for high density recording and reproduction such as a magnetic recording and reproducing apparatus, in particular, a video tape recorder.

In recent years, in order to realize high performance and miniaturization in magnetic recording and reproducing apparatuses, for example, magnetic metals and the like, which have high anti-magnetism which enables high density of magnetic tape recording media, are being researched and developed. In such a magnetic head, a composite magnetic head is used as a magnetic core body by combining a metallic magnetic material having a high saturation magnetic flux density with a ferrite magnetic material having excellent high frequency characteristics.

3 is a perspective view showing the magnetic core body 1 of the conventional hybrid magnetic head, and FIG. 4 is a partially enlarged view showing the tape sliding surface of the magnetic core body 1 shown in FIG.

In the figure, (2), (3) is a magnetic core half body, for example, a metal core (2a) consisting of a thin plate of a metal-based magnetic material having a high saturation magnetic flux density, such as Sendust (registered trademark), Amorphos, and Pharmaroy, (3a) is a bonding agent, for example, by ferrite cores (2b), (2c) and (3b), (3c) formed of a thin plate of an oxide-based magnetic material having excellent high frequency characteristics such as Mn-Zn ferrite. It is laminated | stacked through the thin film of high melting glass, etc., and is integrally bonded and formed.

(4) is a magnetic gap having an azimuth angle θ, and the magnetic core halves 2 and 3 abut through a magnetic gap material made of, for example, SiO ₂ , and the junction of the metal cores 2a and 3a. Is shown on the tape sliding surface (5).

(6) and (7) are, for example, a nonmagnetic material composed of glass or the like, for regulating track widths cut out on the tape sliding surfaces 5 of the ferrite cores 2b, 2c and 3c in a half moon shape. It is filled in the grooves 6a and 7a.

Reference numeral 8 denotes a coil window, which is provided to communicate with the nonmagnetic materials 3a and 3b of one magnetic core half body 3. However, since the metal cores 2a and 3a of the above-described conventional magnetic core body 1 use a thin plate made of a metal-based magnetic material by machining, it is necessary to configure the track width to 20 μm or less. If there is, it is necessary to use a thin plate of 20 µm or less.

However, when the metal-based magnetic material is a thin plate having a thickness of 20 μm or less, there is a problem in that it is very easy to fall out and the productivity is bad. In addition, when the carrier frequency is increased from 4.2 MHz to 5.4 MHz as in the 8 mm video tape recorder, the permeability of the metallic material of about 20 μm is lowered to about 200 to 300 due to the eddy current loss or the like, which is about half or less of the permeability of the ferrite magnetic material There was a problem that the regeneration efficiency deteriorated.

Recently, as proposed in Japanese Patent Application Laid-Open No. 59-116918, a thin film such as amorphous is sequentially laminated on a nonmagnetic substrate by a thin film forming means such as sputtering through a thin film of SiO _{2 and} so on to a track width. A composite magnetic head is disclosed in which a corresponding metal core is provided and a side core made of the same material as that of the nonmagnetic substrate is integrally bonded to the tape sliding portion on the surface where the metal core is formed.

However, when the ferrite material is used as the magnetic core, the magnetic head does not use ferrite material at all because of the occurrence of sliding noise. A nonmagnetic material is formed on one side of the metal core and a plate-shaped magnetic material is formed on the other side. Due to the structure provided, it cannot be said that the reproduction efficiency of the magnetic circuit including the side core is excellent at high frequencies, and the reproduction output C / N (ratio of the carrier level and the effective value of random noise) is not sufficiently obtained. There was this.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a metal core having a track width is formed by alternately stacking a thin film made of a metal magnetic material and a thin film made of an oxide nonmagnetic material on a first magnetic substrate made of an oxide magnetic material. Then, a second magnetic substrate is laminated on the metal core forming surface of the metal core via a thin film made of nonmagnetic material, and then bonded through a support gap material made of a pair of nonmagnetic materials of a magnetic core half body. The metal core has a magnetic core body configured as forming a magnetic gap on the tape sliding surface, which has a coil window for winding the coil and at the same time a track width that connects the coil window to a magnetic substrate near the magnetic gap. A magnetic head characterized by forming a regulating groove and filling the track width regulating groove with a nonmagnetic. To provide for the purpose.

FIG. 1 is a plan view showing the magnetic core body 10 of the hybrid magnetic head of the present invention, and FIG. 2 is a plan view showing the tape sliding surface of the magnetic core body 10 shown in FIG.

Next, a description will be given using FIGS. 1 and 2.

In the figure, (11) and (12) are magnetic core half bodies, for example, magnetic substrates 11a, 11b, 12a, and 12 which are made of oxide magnetic bodies such as Mn-Zn ferrite and Ni-Zn ferrite. 12b) and the metal cores 11c and 12c which have a thickness equivalent to the track width are respectively provided by joining by a two-part bonding agent. In recent years, ferrite materials having low sliding noise are obtained by the improvement of the ferrite material itself, and thus it is advantageous to obtain a magnetic head having a higher C / N by using such a ferrite material.

The metal cores 11c and 12c are, for example, a thin film made of a metal magnetic body such as amorphous or sender by a known thin film forming technique such as sputtering, for example, SiO _2. And a thin film made of an oxide-based nonmagnetic material such as Al ₂ O ₃ , for example, by alternately superimposing a plurality of layers on the magnetic substrates 11b and 12b.

Reference numeral 13 denotes a magnetic gap, which is formed by joining the metal cores 11c and 12c through a magnetic gap material made of an oxide-based nonmagnetic material, and have an azimuth angle of θ on the tape sliding surface 14. 15 and 16 are nonmagnetic materials made of glass or the like, and the track width restricting grooves 17 provided in the magnetic substrates 11a, 11b, 12a, and 12b near the magnetic gap 13 are provided. It is charged in, (18).

Reference numeral 19 denotes a coil window, which communicates with the track width regulating groove. 20 is a coil guide and is provided in the groove shape in the side part of the magnetic core half bodies 11 and 12. As shown in FIG.

Reference numeral 21 is a nonmagnetic material made of glass or the like, and is filled in the bonding window 22 provided on the abutting surfaces of the magnetic core halves 11 and 12, respectively.

As described above, in the magnetic head of the present invention, a ferrite magnetic material having excellent high frequency characteristics is actively introduced in consideration of the availability of a ferrite material having low tape sliding noise. Since the thin film made of the metal magnetic material having a track width was passed through the thin film made of the oxide nonmagnetic material by a pair of substrates made of the ferrite magnetic material, the recording characteristics were originally made. At high frequencies, the eddy current loss during regeneration is reduced, resulting in high regeneration efficiency and C / N. In addition, since the thin film of the multilayered metal magnetic material is formed of an oxide magnetic material having excellent abrasion resistance, the wear resistance is excellent.

Since the composite magnetic head of the present invention has the above-described configuration, the eddy current loss during reproduction at high frequency is small, and the high reproduction efficiency and C / N are obtained, so that it is possible to enjoy an excellent image when used in a video tape recorder. At the same time, it has a feature of long life because of its wear-resistant structure. In addition, mass production of a composite magnetic head is possible. In particular, since the metal coil portion is formed by a multilayer stack of a thin film made of a metal magnetic material and a thin film made of an oxide nonmagnetic material, an accurate track width is achieved regardless of the size of the track cloth. At the same time, there is a characteristic that productivity can be expected to be improved without producing problems such as gold or omission.

Claims (1)

The metal core 11c corresponding to the track width is formed by alternately stacking the thin film 32 made of the metal magnetic material and the thin film 31 made of the oxide nonmagnetic material on the first magnetic substrates 11b and 12b alternately stacked on the first magnetic substrates 11b and 12b. , A pair of non-magnetic pairs of magnetic core halves 11, 12 formed by stacking second magnetic substrates 11a, 12a through a thin film of nonmagnetic material on the metal core forming surface of the metal core. Joined via a magnetic gap material to be formed into an adult, the metal cores 11c and 12c of the magnetic core half are formed as a magnetic core body 10 configured as forming a magnetic gap 13 on the tape sliding surface 14, The magnetic core body has a coil window 19 for winding the coil and at the same time the track width regulation for communicating with the coil window 19 to the magnetic substrates 11a, 12a, 11b, 12b near the magnetic gap 13. The grooves 17 and 18 are formed, and the track width regulating grooves are filled with nonmagnetic materials 15 and 16. Hybrid magnetic head made with gong.

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