JPH02121111A - Magnetic head - Google Patents

Abstract

PURPOSE:To suppress the deterioration in a reproducing screen by crosstalks between magnetic cores by disposing two magnetic cores apart >=100mum spacing between the cores. CONSTITUTION:The two magnetic gaps of the magnetic head device disposed with two pieces of the magnetic head cores 2a, 2b in proximity to each other in a tape sliding direction are set at 1.5 to 2 times one horizontal scanning period and the two magnetic cores 2a, 2b are parted by >=100mum. The size of the I core is reduced and the I-shaped core of the narrower track width with which the performance deterioration is larger is formed larger than the other in case of different track widths. The crosstalks between the magnetic cores generated in the composite magnetic head are eliminated in this way and the high performance is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head, and particularly to a composite magnetic head.
The present invention relates to a magnetic head suitable for a type in which the distance between the magnetic gaps of two magnetic head cores is 1.5 to 2.0 times the distance corresponding to one horizontal scanning period.

[Conventional technology]

In the conventional device, as described in Japanese Patent Application Laid-Open No. 60-182006, the end surface of the edge portion on the side facing the magnetic head core in the sliding direction of the magnetic recording medium is configured in an arc shape, so that the edge portion becomes a pseudo gap for recording and reproduction. This was to prevent the image quality from significantly deteriorating.

[Problem to be solved by the invention]

The above conventional technology is effective against the phenomenon called ghost, in which a low-frequency signal that should not exist appears on the screen when recording and reproducing a signal with a low jl11 degree signal level, by reproducing the low-frequency signal using a pseudo gap. However, no consideration was given to crosstalk between the magnetic cores of a composite magnetic head, especially interference waves of luminance signals, and there were problems such as striped moiré that occurs when two magnetic cores are brought close to each other.

An object of the present invention is to improve the crosstalk between magnetic cores that occurs in a composite magnetic head, and to provide a high-performance magnetic head device. This can be achieved by increasing the distance between opposing magnetic head cores in the head or by extremely reducing the number of windings on the shaped core. However, if the magnetic head core is simply moved away, it is necessary to enlarge the magnetic head mounting window of the rotating cylinder, which worsens jitter. Furthermore, if the dimensions of the shaped core are made too small, the head performance will deteriorate. Also, if you reduce the number of windings on the shaped core,
This not only degrades the performance per unit inductance but also makes it more susceptible to medium wave interference. Therefore, in order to achieve this objective while satisfying the above conditions, it is possible to achieve this by making the two magnetic gaps 1.5 to 2 times the length of one horizontal scanning period and making the two magnetic cores 100 μm or more apart. Ru. Further, when the track widths are different, this can be achieved by reducing the size of the I-core and forming the shaped core with the narrower track width, which causes greater performance deterioration, to be larger than the other.

[Effect]

Heads with narrow track widths are more susceptible to processing distortion during magnetic core formation due to the smaller dimensions of the shaped core. Therefore, heat treatment is performed after forming the magnetic core to reduce processing strain. However, a magnetic core with a narrow track width is inherently subject to a greater degree of machining strain, so it is necessary to ensure sufficient machining core dimensions. moreover,
In a magnetic head using a metal magnetic 'a' film, the crystallization temperature of the magnetic thin film itself is low, so heat treatment cannot be performed at a temperature sufficient to remove the processing strain received during the formation of the magnetic core. It is necessary to have a sufficient shape core to reduce the degree of processing distortion.

On the other hand, crosstalk between the magnetic cores can be reduced by keeping the distance between the two magnetic cores at least 100 μm or more.
It can be set to a level that does not cause any problems in image quality.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Figure 2 shows a magnetic head device composed of two Herad chips attached to a head support 8.6 Figure 1 is a view of the magnetic head device seen from the magnetic medium sliding surface; This is an example in which a metal magnetic thin film magnetic head core is placed on one side, and a ferrite magnetic head core with a large track width is placed on the other side. FIG. 3 shows a magnetic head device and magnetic medium 11 arranged in a rotating cylinder 12. As shown in FIG. As shown in FIG. 3, there is a tendency to make the window of the rotating cylinder 12 as small as possible due to the problem of jitter. Therefore, the shaped magnetic core 2a of the magnetic head,
2b, the distance between the magnetic gaps 5a and 5b cannot be increased, and due to the problem of spacing loss with the magnetic medium 11, the limit is twice the length of one horizontal scanning period. Therefore, the adjacent shaped magnetic cores 2a and 2b have shaped core windings 9a and 9b, respectively, and crosstalk occurs due to magnetic induction. Therefore, ■-shaped magnetic core 2a.

By ensuring a distance of 2b of 100 μm or more.

Measures were taken to prevent crosstalk. However, simply reducing the dimensions 6a and 6b of the ■-shaped magnetic cores 2a and 2b results in a decrease in output. In particular, as shown in Figure 1, in the case of a magnetic head core made of a metal magnetic thin film with a narrow track width, by reducing the working core dimension 6, it is more susceptible to processing distortion, and heat treatment can sufficiently reduce processing distortion. This results in a drop in output, and because the absolute output is small, the effects of crosstalk become more visible. Therefore, due to the problem of crosstalk, the distance between the I-shaped magnetic cores 2a and 2b was set to 100.
Since it is more than μm, ■-shaped core size is 6a.

6b, the shaped core dimension 6b on the metal magnetic thin film 3 side is made larger than the shaped core dimension 6a on the other side, making it less susceptible to processing distortion.

In addition, the magnetic head composed of the metal magnetic thin film 3 shown in FIG. Increasing the ratchet magnetic coring 6b has the effect of reducing the influence of machining distortion.

Figure 4 shows a ferrite head for video, Figures 5 and 7 show a metal magnetic thin film head for video and an audio head, Figures 8 and 9 show a metal magnetic thin film head for video, and Figure 6 shows a metal magnetic thin film for video. An example of a combination of a head and a ferrite head is shown.

〔Effect of the invention〕

According to the present invention, by arranging two magnetic cores with a distance of 100 μm or more, there is an effect of suppressing deterioration of the reproduced screen due to crosstalk between the magnetic cores. In addition, under the above conditions, by ensuring sufficient I-shaped magnetic core dimensions for narrow track width magnetic heads with small absolute output and metal magnetic thin-film magnetic heads, processing strain on the ■-shaped magnetic core can be reduced. In addition, the magnetic resistance of the I-shaped magnetic core can be reduced.

It is effective in improving output and stabilizing performance.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a plan view showing an overall view of the magnetic head device configured in FIG. 1, and FIG.
The figure is a sectional view of essential parts showing the configuration of a rotating cylinder, a magnetic tape, and a magnetic head. 4 to 9 are front views of other embodiments. 1... Cff3 magnetic core, 2... Shaped magnetic core, 3
... Metal magnetic thin film, 4... Filled glass, 6... Shaped core dimensions. 7...Ghost processing, 8...Head support, 9...
・I-type core winding, 10...C-type core winding, 11...
Magnetic medium, 12...rotating cylinder. No.! Figure 4- Figure

Claims (1)

[Claims] 1. In a magnetic head device in which two magnetic head cores are arranged close to each other in the tape sliding direction, the magnetic gap is set to 1.5 to 2 times the distance corresponding to one horizontal scanning period. A magnetic head defined in the following, and characterized in that the two magnetic head cores are arranged with a distance of 100 μm or more at the closest portion. 2. In the magnetic head, when the two magnetic head cores have different track widths, the dimension of the I-shaped magnetic core of the two magnetic head cores having the smaller track width is configured to be larger than that of the other magnetic head core. The magnetic head described. 3. The magnetic head according to claim 1, wherein at least one of the magnetic heads is composed of a metal magnetic thin film, and the size of the I-shaped magnetic core is larger than that of the other magnetic head. .