JPH01235015A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To improve the off-track and crosstalk characteristics by setting the head element of a 2nd head at a part where a 1st head performed no recording/reproducing actions when both heads move on a magnetic recording medium to record and reproduce the signals. CONSTITUTION:Plural tracks are recorded on a magnetic recording medium by a 1st head 18 at an azimuth theta1 and with a certain space secured among those tracks. At the same time, the space parts among the tracks recorded by the head 8 are recorded by a 2nd head 9 at an azimuth theta2. Then the same head scanning operations are carried out also when the signals recorded on the recording medium are reproduced. Thus no unrecorded part exists virtually on the recording medium and the signals are recorded with the azimuths given to each track. As a result, the off-track and crosstalk characteristics can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording device that records and reproduces signals by dividing them into a plurality of head elements.

2. Description of the Related Art As the frequencies of signals handled have become higher, means have been used in recent years to divide the signals and record and reproduce them on magnetic recording media. In order to record and reproduce signals by dividing them in this way, a plurality of magnetic heads are required. In order to realize such a method, a plurality of so-called bulk-type magnetic heads constructed by bonding blocks made of soft magnetic material are attached to a single head fixing base, or a fixing base with a magnetic head attached thereto is used. Conventionally, measures have been taken such as attaching a plurality of bases in one rotating cylinder. However, if the number of signal divisions, that is, the number of channels increases, the number of heads must also increase accordingly, but the accuracy of the head assembly is only a few μm at most.
, it was difficult to accurately mount multiple heads with small track widths at desired positions. For this reason, thin film magnetic heads, which can easily form a plurality of head elements in one Herad chip and have good tracking accuracy, are being used for such applications. Figure 3 shows a suitable example of such a thin film magnetic head (Source: Institute of Electronics and Communication Engineers Technical Research Report MR86-3
0). In the figure, 1 is a substrate, 2 is a lower core, 3 is a gap, 4 is a coil, and 5 is an upper core, and the lower core 2 and the upper core 5 are connected by a connecting portion 6.

However, due to the number of turns required and constraints on the coil patterning technology, the width in the track direction where the coil is formed (
In FIG. 3, A) is larger than the track width (B).

Therefore, even if an attempt was made to reduce the track width and the track pitch (C), which is the interval between adjacent heads, this was difficult because the coils interfered with each other between the adjacent heads. In addition, in a head with an inline gap as shown in Fig. 3, two adjacent
In order to operate the two heads independently of each other, it is necessary to provide a portion (D) in which no magnetic path is formed between them. For this reason, it is not possible to record on a magnetic recording medium without leaving any unrecorded portions. In order to solve the above-mentioned drawbacks, it is possible to adopt a method of forming a thin film magnetic head having a so-called staggered structure as shown in FIG. However, FIG. 4 is a front view of the head when viewed from the medium sliding surface. By adopting this kind of structure,
The coils of adjacent heads do not interfere with each other, and the track ends of the two heads can be easily aligned on a straight line as shown by the dotted lines in FIG. but,
In the case of a thin-film magnetic head like the one shown in Figure 4, the gap forming surface of the lower head is parallel to that of the upper head, so the off-track characteristics and crosstalk characteristics are different from those of the magnetic head with an azimuth angle. Not as good as when recording and playing back.

Problems to be Solved by the Invention As stated above, in a magnetic recording device that records and reproduces signals by dividing them into multiple channels, there is a magnetic recording device that has almost no unrecorded portions on the medium and has good off-track characteristics and crosstalk characteristics. So, you can get something with a simple head assembly.

Means for Solving the Problems The magnetic gap has n head elements (n≧2: n is a natural number) whose magnetic gaps are inclined at a certain azimuth angle θ1 with respect to the direction perpendicular to the head running direction, and between the head elements there are a first head having a certain space; a second head having an azimuth angle of θ2 and at least (n-1) or more head elements; When the head travels on a magnetic recording medium to record or reproduce a signal, the head element of the second head is arranged in contact with the first head such that the head element of the second head is located in a portion that was not recorded or reproduced by the first head. Attach the second head. .

On the working magnetic recording medium, a plurality of tracks are recorded with a certain spacing at an azimuth angle θ1 by a first head, and at the same time, a plurality of tracks recorded by the first head are recorded by a second head at an azimuth angle θ2. record in parts.

Thereafter, when reproducing signals on the magnetic recording medium, the same head scanning as when recording is performed. By using such means, there is almost no unrecorded area on the medium (and since the azimuth can be applied to each track for recording, it is possible to improve off-track characteristics and crosstalk characteristics. Since a plurality of head elements are formed in the head, the number of operations can be reduced compared to when assembling the same number of heads individually.

EXAMPLES Specific examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG. 1(a)
The head is attached to the base 7 with the first Rad tip 8 and the second
A perspective view showing a case where two head chips 9 are attached;
FIG. 1(b) is an enlarged front view of the area within the circle indicated by X in FIG. 1(a).

A plurality of head elements having magnetic circuits similar to the thin film magnetic head shown in FIG. 3 are formed in the first Herad chip 8. This first head chip 8 is attached to the base 7 so that the gap forming surfaces of these head elements have an inclination of a certain azimuth angle θ1 (=10) with respect to the direction perpendicular to the head running direction. .

- On the other hand, the second head chip 9 has the same number of head elements having the same track width and track pitch as the first head chip 8. The gap forming surface of the head element of the second head element 9 has an azimuth angle θ in a direction opposite to that of the first head chip 8 with respect to the direction perpendicular to the head running direction.
The head is mounted so that the head element has an inclination of 2 (=-θ) and is located in the interval that occurs when recording is performed with the first radar chip 8, as shown in FIG. 1(b). is attached to the heath 7. With this configuration, the first head chip 8 can record at a certain azimuth angle of 10 at the same interval as the track width, and the second head chip 9 can record at the opposite azimuth angle -θ at the interval. .

By using the above means, the following advantages arise.

Even if such a thin film magnetic head is used, there will be no unrecorded portions in the recording pattern on the medium, and it is possible to record on the magnetic recording medium at high density.

Second, as mentioned above, since azimuth recording is performed while recording at high density on a magnetic recording medium, the off-track characteristics and crosstalk characteristics between adjacent tracks are lower than current home video tape recorders. Similar properties can be obtained.

Thirdly, in terms of the head configuration, if the coil width A in FIG. 3 can be formed with the relationship A<2XB with respect to the track width B, the configuration of this embodiment can be adopted. For this reason, the constraints when forming a coil are
This is smaller than the method of reducing the unrecorded portion simply by reducing the track pitch.

Fourth, since we use a multi-channel magnetic head in which multiple head elements are formed in one Herad chip using photolithography technology, when the same number of magnetic heads are separately attached to the cylinder, In comparison, the positional relationship between the tracks of each magnetic head can be adjusted accurately, and the number of steps for assembling the head can be reduced.

In this embodiment, as shown in FIG. 1, the number of head elements of the first bed chip and the number of head elements of the second bed chip are the same, the track width of each and the space between the elements are the same, and the space and track width are the same. Although we have described the case where the values are the same and there is no unrecorded portion on the medium during recording, the same effect can be achieved in the following case.

(1) Number of head elements of the first Herad tip and the second
If the head chips have different numbers of head elements.

(2) When the track width of the head element of the first Herad chip is different from that of the second head chip.

(3) When each of the head elements of the first or second Herad tip has a different track width.

(4) When recording is performed in such a way that there are unrecorded areas on the medium.

Next, a second embodiment of the present invention will be described using FIGS. 2(a) and 2(b).

In this embodiment, there are a head element group with an azimuth angle of 10 and a head element group with an azimuth angle of 10 in one Herad chip. In FIG. 2(a), a first head element group 10 is formed on a substrate 1 using a process similar to that of forming the thin film magnetic head shown in FIG. Next, a protective layer 11 is formed on these, and as shown by the dotted line in the figure,
The protective layer 11 is polished so that it forms an angle of 2θ with respect to the substrate surface. Next, as shown in FIG. 2(b), the second head element group 12 is placed on the plane obtained by this polishing.
form. At this time, the positional relationship between the first head element group 10 and the second head element group 12 is
This is similar to the example. After this, a protective layer 13 is formed and a cover 14 is adhered. After creating this state, the image shown in Figure 2 (
Cut at the angle of the dotted line shown in b), that is, at an angle of θ with respect to the vertical direction of the substrate surface. The head chip thus obtained is attached to the base by adhering it to the base. By adopting the above configuration, compared to the case where the head is simply configured parallel to the substrate surface as shown in FIG. Good track characteristics and crosstalk characteristics.

Effects of the Invention By using the present invention, even if a multi-channel thin film magnetic head is used to record on a magnetic recording medium, there is no unrecorded portion on the medium and recording can be performed at high density. On the other hand, since recording can be performed with an azimuth angle given to each track, off-track characteristics and crosstalk characteristics can be improved. In addition, since multiple head elements are formed in one head, the number of operations can be reduced compared to when assembling the same number of heads individually, and the buttering of head elements can be done easily. Since photolithography technology is used in this process, each head element can be positioned accurately.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of a magnetic recording device according to a first embodiment of the present invention, in which (a) is a perspective view, and (b) is a perspective view of the magnetic recording device.
2 is a cross-sectional view showing the state of the magnetic head in the middle of manufacturing in the same embodiment, FIG. 3 is a perspective view showing the magnetic head in the conventional example, and FIG. 4 is the conventional example. FIG. 3 is a front view showing a magnetic head in FIG. 2... Lower magnetic layer, 3... Gap, 5... Upper magnetic layer, 7... Head mounting on base, 8... First
Herad tip, 9...Second head tip. Name of agent: Patent attorney Toshio Nakao 1 person? - Lower wipeability 1 3 - Gimap 6 - Upper sulfuric layer 7 - Head removal base 8 - 1st Rad tip 9 9 - 11 2nd Rad tip 1! ! 2I Moonset - 7th normal direction Fig. 2

Claims (1)

[Claims] It has n head elements (n≧2: n is a natural number) whose magnetic gap is inclined at a certain azimuth angle θ1 with respect to the direction perpendicular to the head running direction, and there is a certain space between the head elements. a first head and a second head having an azimuth angle of at least (n-1) or more head elements at θ2 different from θ1;
When the first head and the second head run on a magnetic recording medium to record or reproduce a signal, the head element of the second head covers a portion that was not recorded or reproduced by the first head. A magnetic recording device, characterized in that the first head and the second head are attached so that they are located in the same position.