JPS6280812A - Highly efficient ferrite magnetic head - Google Patents

Abstract

PURPOSE:To obtain a highly efficient ferrite magnetic head by butting two ferrite core blocks having a winding slot, selecting the width of one block as 0.09-0.9mm, and constituting at least one block to be stuck to a nonmagnetic base or similar base. CONSTITUTION:The core width t1 of both an I core 1 and a C core 2 is selected as 0.3mm, stuck to a ceramic base 5 whose thermal expansion coefficient alphais nearly 90 by a Pb glass 4 and the cores 1, 2 are butted to form a magnetic head. Through the constitution above, a reproduced output per unit inductance of the magnetic head is improved, the service life is equivalent to a conventional inductance or over, the head is suitable for high density magnetic recording and the performance is improved by 2dB by the evaluation of reproduced output C/L<1/2>. Since the ferrite part is reduced, the sliding noise specific to the ferrite is reduced.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a high-efficiency ferrite magnetic head, and particularly to a high-efficiency ferrite magnetic head for video use that has a high reproduction output per unit inductance and is suitable for high-density magnetic recording. It is related to the head.

[Background of the invention]

Conventional magnetic heads of this type are made by butting two cores together, but there is no designation of the dimensions or size of the cores, and I have not seen any that have non-magnetic blocks attached to them. do not have. An example of this type is the one proposed in Japanese Patent Application Laid-Open No. 150126/1983.

[Purpose of the invention]

The present invention has been made in view of the above, and its purpose is to provide a high-efficiency ferrite magnetic head that has a high reproduction output per unit inductance and can perform high-density magnetic recording without sacrificing service life. Our goal is to provide the following.

[Summary of the invention]

A feature of the present invention is that in a magnetic head formed by abutting at least two ferrite core blocks having grooves serving as winding windows, the width of at least one of the ferrite core blocks is set to α09 to 0.
．． At least one of the ferrite core blocks mentioned above is between 9 pieces, and at least one of the ferrite core blocks is
The structure is such that it is attached to a non-magnetic substrate or a similar substrate.

[Embodiments of the invention]

Examples of the present invention shown in FIGS. 1 to 3 and 4
This will be explained in detail using FIGS.

First, the progress that led to the present invention will be explained using FIGS. 4 to 6. As shown in FIG. 4, the magnetic head is made up of two cores 1.2 that are joined together, the core 2 having the groove 3 serving as the winding window being called the C core, and the other core 1.
is called 1 core. In Fig. 4, 7 turns of winding are applied to the eco-core 1 side, 4 turns of the winding is applied to the other C-core 2 side, and when the width t of core 1 is changed, M,
-Z! .

Inductance of single crystal ferrite magnetic head, 4 M
Hz playback output (at relative speed 5.8m/s) and 4M
The so-called 2
Fig. 5 shows the 629 KHz retry power using the frequency signal. From Figure 5, it can be seen that, like curve a,
■If the width t of core 1 is increased, the inductance will be 1@
One of the curves that increases next is that, as shown in curve c, the 4 MHz reproduction output and the 629 KHz reproduction output tend to saturate when tl increases to a certain extent. Incidentally, the efficiency of a magnetic head is evaluated by the reproduction output per unit inductance.If the inductance is divided and the reproduction output is C, then the larger the value of C/J, the higher the efficiency of the magnetic head.

Fig. 6 is a graph obtained by rewriting Fig. 5 into the relationship between the width t of ecore 1 and C/(T:, and (a) shows the relationship between the width t of ecore 1 and C/(T:).
b) shows the case of 4MHz, ■Width t of core 1,
It represents the magnetic head reproducing efficiency with respect to the magnetic head. From Figure 6, ■The width of core 1 is also the optimum value (α09~α9mm)
It can be seen that the reproduction efficiency of the magnetic head deteriorates if the width t of the core 1 is too narrow or wide.

On the other hand, magnetic heads are capable of recording and reproducing information only when they come into contact with a so-called medium such as a tape or sheet, and there is a problem that the magnetic head has a limited lifespan due to wear. In order to solve this problem, it is sufficient to compensate for the reduced core width with a substrate or the like that does not increase the inductance commensurately. The most suitable substrate is a nonmagnetic substrate.

Next, examples will be described. FIG. 1 is a side view showing an embodiment of the high efficiency ferrite magnetic head of the present invention. In Fig. 1, 1 is an I core, and 2 is a C core. Both cores have a width of α311IK. They are attached to a non-magnetic substrate 5 using low melting point glass, and the Eco core 1 and C core 2 are butted against each other to create a magnetic field. This is what makes up the head. 3 is a groove serving as a winding window, and 4 is a glass. As the non-magnetic substrate 5, for example, a ceramic having a thermal expansion coefficient α of about 90 was used. Further, as the low melting point glass, P type glass was used.

In the example shown in FIG. 1, the inductance was reduced by 30%, and there was no reduction in reproduction output at all. Therefore, by increasing the number of windings to raise the inductance to the original width of 1.15 mm, the reproduction output improved by about 1.5 dB.

As described above, according to the embodiments of the present invention, the reproduction output per unit inductance of the magnetic head is improved, the life is equal to or longer than that of the conventional one, and it is suitable for high-density magnetic recording.
In our evaluation, there is a performance improvement of around 2dB. Furthermore, since the number of ferrite parts is reduced compared to the conventional one, the sliding noise of 7-element W is reduced, thereby improving the C/N.

FIG. 2 is a side view corresponding to FIG. 1 showing another embodiment of the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. In FIG. 2, the width of the C core 2 is left as is, and only the width of the core 1 is filled with α3, and this is attached to the nonmagnetic substrate 5.

FIG. 3 is a side view corresponding to FIG. 1 showing still another embodiment of the present invention. In FIG. 3, ■ the width of the core 1 is α2
III+, and the width of C core 2 is approximately 0 as α4tta.
．． 81 non-magnetic substrate 5 is attached.

Such a magnetic head has a head shape suitable for a double azimuth magnetic head. Note that as the substrate 5, a substrate having a composition of MnO, N, and O was used.

Further, in the above-described embodiments, ceramic is used as the substrate 5, but the substrate 5 is not limited to this, and may be made of glass, a raw egg magnetic ferrite plate, or other similar materials. Furthermore, the low melting point glass is not limited to Pb-based glass.

〔Effect of the invention〕

As explained above, according to the present invention, the reproduction output per unit inductance is high without shortening the service life.
In addition, there is an effect that high-density magnetic recording is possible.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of a high-efficiency ferrite magnetic head of the present invention, FIGS. 2 and 3 are side views showing other embodiments of the present invention, and FIG. 5 is a diagram showing the relationship between the echo core width t and the inductance and reproduction output of the magnetic head configured as shown in FIG. 4. FIG. J
``This is a diagram rewritten to the L- relationship. 1... Eco core, 2... C core, 3... Groove that becomes a winding window, 4... Glass, 5... Non Magnetic substrate. 11r2 Figure 2 ￥30 Tsuta 40 Ecore medium weight (1, air) 6th surface (α) 1 core medium rs t4 (rnyn) (b) l core medium thread -t, 1 (-sail)

Claims (1)

[Claims] 1. A magnetic head formed by abutting at least two ferrite core blocks having grooves serving as winding windows, in which the width of at least one of the ferrite core blocks is between 0.09 and 0.9 mm. A high-efficiency ferrite magnetic head characterized in that at least one of the ferrite core blocks is attached to a non-magnetic substrate or a similar substrate.