JPH0520647A - Perpendicular magnetic recording head - Google Patents

Abstract

PURPOSE:To prevent the one-sided contact of the perpendicular magnetic recording head for reading and writing with a magnetic recording medium relating to the construction of the perpendicular magnetic recording head of a magnetic disk device. CONSTITUTION:This magnetic head has a bar, a pad constituted at the front end of the bar, a magnetic pole for reading and writing formed through the bar and the pad, and magnetic heads for positioning provided on one side or both sides of the magnetic head for reading and writing and is so constituted as to detect the parallelism of the magnetic pole for reading and writing with the plane of the magnetic recording medium by the output of the magnetic heads for positioning to be read from the magnetic recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a magnetic recording head in a magnetic disk device. There is a demand for high-speed and high-density recording in a magnetic disk device, and as a recording method, a perpendicular recording method is attracting attention as being suitable for contact recording as compared with a conventional horizontal recording method.

Further, miniaturization of the device can be realized by increasing the recording density. The perpendicular magnetic recording head 1 targeted by the present invention is applied to a small-sized contact recording magnetic disk device using a magnetic disk having a diameter of about 3.5 inches.

[0003]

2. Description of the Related Art As shown in the side view of FIG. 4, a magnetic disk device to which the present invention is applied includes a magnetic disk 2 and a spindle 3 for rotating the magnetic disk 2.
A perpendicular magnetic recording head 1 that contacts both sides of the magnetic disk 2, and a carriage 4 that holds the perpendicular magnetic recording head 1.
And a voice coil motor 5 for seeking the perpendicular magnetic recording head 1 and the like.

In the perpendicular magnetic recording head 1, the rear end of the bar 6 is fixed to the arm 4a of the carriage 4 by adhesion. As shown in the plan view of FIG. 5 and the side view of FIG. 6, the perpendicular magnetic recording head 1 has a carbon pad portion 7 at the tip of a bar 6 of, for example, alumina having a width of 500 μm, a thickness of 50 μm and a length of 10 mm. The magnetic poles 8 for reading and writing are provided by a method such as sputtering as shown in the enlarged view of the main part of FIG.

This perpendicular magnetic head is, for example, a Data Str
age 90An International Forum: September 10-12; 1990
Fairmont Hotel San jose, California Censtor Cor
It was announced by poration.

Perpendicular magnetic recording head 1 to which the present invention is applied
Reads and writes by directly contacting the surface of the magnetic disk 2 and sliding without pressing the magnetic disk 2.

[0007]

Perpendicular magnetic recording head 1
In some cases, depending on the mounting accuracy, the pad portion 7 may be unevenly contacted, and the magnetic pole 8 may not make good contact with the surface of the magnetic disk 1.

Then, there is a problem in that not only variations in the read / write characteristics but also the durability (variation in wear rate) of the perpendicular magnetic recording head 1 is affected.
An object of the present invention is to prevent the perpendicular magnetic recording head for read / write from hitting the magnetic recording medium.

[0009]

In the present invention, as shown in the enlarged view of the essential part of FIG. 1, a bar 9, a pad 7 provided at the tip of the bar 9, a bar 9 and a pad 7 are formed. The magnetic pole for read / write 8 and the magnetic pole for positioning 10 provided on one side or both sides of the magnetic pole for read / write 8 are arranged on the surface of the magnetic recording medium 2. Is in a position retracted from the read / write magnetic pole 8. The parallelism of the read / write magnetic pole 8 with respect to the surface of the magnetic recording medium 2 is detected based on the output of the positioning magnetic pole 10 read from the magnetic recording medium 2.

[0010]

The output of the positioning magnetic pole when the read / write magnetic pole is parallel to the magnetic recording medium is read from the magnetic recording medium and stored in advance as a threshold value.

Therefore, when assembling parallelism during assembly, it is possible to detect whether the read / write magnetic pole is parallel to the magnetic recording medium by comparing the output of the positioning magnetic pole with the threshold value.

If there are positioning magnetic poles on both sides of the read / write magnetic pole, both outputs are compared, and if they are equal, it is detected that the read / write magnetic pole is parallel to the magnetic recording medium. .

When it is detected that one-sided contact is made, the arm of the carriage is deformed to adjust the mounting angle of the bar so that the output of the positioning magnetic pole becomes appropriate. When adjusting
Since the positioning magnetic pole is set back with respect to the read / write magnetic pole and has a space for the magnetic recording medium, the work can be easily performed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a bar 9 and a pad 7 provided at the tip of the bar 9 are provided, as shown in the enlarged view of the main part of FIG.
A magnetic pole for read / write provided so as to penetrate the bar 9 and the pad 7, and a magnetic pole for positioning 10 provided on one side or both sides of the magnetic pole for read / write 8 for positioning. The magnetic pole 10 is located at a position retracted from the read / write magnetic pole 8 with respect to the surface of the magnetic recording medium 2.

The parallelism of the read / write magnetic pole 8 with respect to the surface of the magnetic recording medium 2 is detected by the output of the positioning magnetic pole 10 read from the magnetic recording medium (magnetic disk) 2.

It is desirable that the positioning magnetic pole 10 has a core width 2 to 3 times the core width of the read / write magnetic pole 8 so that the read output becomes large. In the detection method, at the time of assembly, the read / write magnetic pole 8 first records information on the magnetic disk 2, and at the same time, the positioning magnetic pole 10 records the read information.

Next, when the read / write magnetic pole 8 is parallel to the magnetic disk 2, that is, when the output is maximum, the output of the positioning magnetic pole 10 is read from the magnetic disk 2 by a monitor and stored in advance as a threshold value. Keep it.

Therefore, in order to adjust the parallelism at the time of assembly, the output of the positioning magnetic pole 10 is read by a monitor as shown in the chart of FIG. The write magnetic pole 8 is the magnetic disk 2
It is detected whether or not it is parallel to.

When the positioning magnetic poles 10 are provided on both sides of the read / write magnetic pole 8, as shown in the chart of FIG.
The outputs of both positioning magnetic poles 10 are compared, and when the outputs are equal, it is detected that the read / write magnetic pole 8 is parallel to the magnetic disk 2.

In the case of one-sided contact, the arm 4a of the carriage 4 shown in FIG. 4 is deformed to adjust the attachment angle of the bar 9 to the magnetic disk 2 so that the output of the positioning magnetic pole 10 becomes appropriate.

At this time, the positioning magnetic pole 10 is retracted with respect to the read / write magnetic pole 8 and there is a space for the surface of the magnetic disk 2, so that the work can be easily performed.

[0022]

According to the present invention, the perpendicular magnetic recording head for read / write can be prevented from hitting the magnetic recording medium even if the accuracy of the parts is not so good. Is eliminated, the durability of the perpendicular magnetic recording head is improved, and the like, which is very effective economically and industrially.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of a perpendicular magnetic recording head of the present invention,

FIG. 2 is a diagram comparing the output of the positioning magnetic pole of the perpendicular magnetic recording head of the present invention with a threshold value;

FIG. 3 is a diagram for comparing outputs when there are a plurality of positioning magnetic poles in the perpendicular magnetic recording head of the present invention,

FIG. 4 is a side view of a magnetic disk device to which the present invention is applied,

FIG. 5 is a plan view of a conventional perpendicular magnetic recording head,

FIG. 6 is a side view of a conventional perpendicular magnetic recording head,

FIG. 7 is an enlarged view of a main part of a conventional perpendicular magnetic recording head,

[Explanation of symbols]

2 magnetic recording medium (magnetic disk), 4 carriage, 4a arm, 7 pad, 8 read / write magnetic pole, 9 bar, 10 positioning magnetic pole,

Claims (3)

[Claims] 1. A bar (9), a pad (7) provided at the tip of the bar (9), and a read / write magnetic pole (8) formed through the bar (9) and the pad (7). And a positioning magnetic pole (10) provided on one side or both sides of the read / write magnetic pole (8). 2. The perpendicular magnetic recording according to claim 1, wherein the positioning magnetic pole (10) is at a position retracted from the read / write magnetic pole (8) with respect to the surface of the magnetic recording medium (2). head. 3. The method according to claim 1, wherein the magnetic recording medium (2) is read.
A perpendicular magnetic recording head characterized in that the parallelism of the read / write magnetic pole (8) to the surface of the magnetic recording medium (2) is detected based on the output of the positioning magnetic pole (10).