JPH03212812A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide magnetic head having a larger capacity with a simple structure by disposing a magnetic gap in such a manner that the absolute value of the angle formed between the magnetic gap and the tangent line of the cylinder of a disk increases from the inner side to outer side of the disk. CONSTITUTION:The magnetic gap 2b is provided with an inclination by theta deg.while a general magnetic gap is so provided as to intersect orthogonally with a yoke 2a. An azimuth angle alpha is gradually increased from the inner side to the outer side of the disk 1. Namely, the azimuth angle alpha is small on the outer side and, therefore, the effective core width decreases as well and the track density is correspondingly increased. The magnetic head having the larger capacity is obtd. with the simple structure in this way.

Description

[Detailed Description of the Invention] [Summary] Regarding a magnetic head that floats due to airflow generated by a rotationally driven disk and reads/writes data to the disk, it is possible to increase the capacity with a simple structure. To provide a magnetic head, the magnetic gap is arranged such that the absolute value of the angle (azimuth angle) between the magnetic gap and the tangential direction of the cylinder of the disk gradually increases from the inner side to the outer side of the disk. Configure to place.

[Field of Industrial Application] The present invention relates to a magnetic head that floats due to an air flow generated by a rotationally driven disk and reads/writes data to/from the disk.

In recent years, there has been a demand for larger capacities in magnetic disk drives, and one way to solve this problem is to increase the recording density.

[Prior art] In a conventional magnetic disk device, the number of revolutions of the disk,
In addition, the recording frequency (transfer rate) is often fixed. Therefore, the radial position of the disk (cylinder position)
The linear recording density differs depending on the

For this reason, the specifications of the linear recording density are determined by the characteristics of the innermost cylinder, which is the most severe condition in terms of read/write characteristics.

[Problems to be Solved by the Invention] However, although linear recording density equivalent to that of the innermost cylinder can be performed on the outermost cylinder of the disk of the disk device configured as described above, due to the above limitations, the linear recording density is lower. There is a problem with recording density.

One way to solve this problem is to use zone bits.
Recording (hereinafter referred to as ZBR) is being put into practical use. In this method, the disk is divided into several zones radially, and the outer zones have a higher recording frequency, thereby equalizing the linear recording density among the zones.

However, this ZBR has a problem in that the recording frequency changes in each zone and the circumferential capacity (cylinder capacity) also changes, which puts a burden on circuit system and usage compatibility.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a magnetic head with a simple structure and a large capacity.

[Means for Solving the Problems] In the magnetic head of the present invention which solves the above problems, the absolute value of the angle (azimuth angle) between the magnetic gap and the tangential direction of the cylinder of the disk varies from the inner side of the disk to the outer side of the disk. The magnetic gap is arranged so as to gradually increase toward the sides.

[Function] In the magnetic head of the present invention, since the azimuth angle is smaller on the outer side, the effective core width is also smaller, and the track density can be increased accordingly.

[Example] Next, an example of the present invention will be described using the drawings. 1st
The figure is a configuration diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram when the magnetic head in FIG. 1 is located in the innermost cylinder, and FIG. 3 is an explanatory diagram when the magnetic head in FIG. Figure 4 is a diagram explaining the relationship between the azimuth angle of the magnetic head and the cylinder position of the disk in Figure 1, Figure 5 is the effective core width of the magnetic head in Figure 1. FIG. 3 is a diagram illustrating the relationship between the data and the cylinder position of the disc.

First, in FIG. 1, numeral 1 is a disk that is rotationally driven by a spindle motor (not shown), and numeral 2 is a magnetic head that floats due to the airflow generated by the disk 1 and writes/writes data to the disk 1. . This magnetic head 2 is attached to a helad arm 4a of a carriage 4 via a spring arm 3.

The carriage 4 is caused to swing by a voice coil motor (not shown). or,
In the magnetic head 2, 2a is a yoke of a magnetic circuit extending in the axial direction of the magnetic head 2. A magnetic gap 2b (details will be described later) is formed at the tip of this yoke 2a.

Next, the magnetic head of this embodiment will be explained using FIGS. 2 and 3. The magnetic gap 2b of this embodiment is θ° (in the case of this embodiment, 25' from the general magnetic gap), whereas the general magnetic gap is provided perpendicular to the yoke 2a. It is set at an angle.

In these figures, α is the angle between the normal direction M of the cylinder and the magnetic gap 2b, the so-called azimuth angle, and β is the angle between the axial direction of the magnetic head 2 (yoke 2a) and the tangential direction of the cylinder. , is the so-called yaw angle. Then, α is positive clockwise with respect to the magnetic gap 2b, and β is the yoke 2a.
Clockwise rotation is positive.

In a general magnetic head, the relationship is α-β, but in this embodiment, the relationship is α-β+25°. The azimuth angle α gradually increases from the inner side to the outer side of the disk 1 (+18
'~+34'').This relationship can be expressed as
As shown in the figure.

According to such a configuration, since the effective core width C is the actual core width C6XC08 (α), the effective core width C gradually increases from the innermost to 85% of the outermost, as shown in FIG. will decrease.

In this way, since the effective core width becomes narrower toward the outer side, it is possible to increase the track density on the outer side, and the capacity of the device can be increased.

[Effects of the Invention] As explained above, according to the present invention, the angle between the magnetic gap and the tangential direction of the cylinder of the disk (azimuth angle)
By arranging the magnetic gap so that the absolute value of is gradually increased from the inner side to the outer side of the disk, a magnetic head that can increase the capacity with a simple structure can be realized.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram when the magnetic head in FIG. 1 is located in the outermost cylinder. FIG. 4 is an explanatory diagram when the magnetic head in FIG. 1 is located in the outermost cylinder. FIG. 5 is a diagram illustrating the relationship between the azimuth angle of the magnetic head and the cylinder position of the disk, and FIG. 5 is a diagram illustrating the relationship between the effective core width of the magnetic head and the cylinder position of the disk in FIG. 1 to 5, 1 is a disk, 2 is a magnetic head, 2b is a magnetic gap, 3 is a spring arm, and 4 is a carriage.

Claims (1)

[Claims] A magnetic head (2) that floats due to an air flow generated by a rotationally driven disk (1) and reads/writes data to/from the disk (1), comprising: a magnetic gap (2b); The magnetic gap (2b) is arranged such that the absolute value of the angle (azimuth angle) formed by the tangential direction of the cylinder of the disk (1) gradually increases from the inner side to the outer side of the disk (1). A magnetic head characterized by: