JPH0366007A - Magnetic recording reproducing head and track width variable type storage device - Google Patents

Abstract

PURPOSE:To attain guard bandless recording with a single head by forming a curved shape of head gap for a magnetic recording and reproducing head. CONSTITUTION:The shape of a head gap is selected to be a curved shape head gap 7, especially circular-arc, then the azimuth angle at both ends of the head gap is different from the track forming direction. Thus, the recording direction at adjacent track ends has an azimuth angle and guard bandless recording is attained. Since the shape of head gap is curved in this way, an azimuth angle is provided at both ends of the head gap and guard bandless recording is attained with a single head.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing head and a variable track width storage device used in magnetic disk drives, floppy disk drives, and the like.

2. Description of the Related Art Guard panless recording (also called slanted azimuth recording), which is used in home VTRs, is well known as a method of increasing track density. In this method, a relative gap angle is set between two heads that record and reproduce adjacent tracks, and crosstalk is reduced by utilizing azimuth loss. (For example, Introduction to magnetic recording technology pp1
90-193, written by Katsuya Yokoyama, Sogo Denshi Shuppansha) Figure 4 shows a perspective view of the head used in conventional guard panless recording, and Figure 5 shows its plan view.
Gaps a) and (b) are formed at different angles with respect to the traveling direction of the head. Further, the gap shape is linear. By alternately using these two heads for each track, guard panless recording is possible.

On the other hand, as a method of keeping the areal recording density of a rotary recording medium that rotates at a constant speed constant, there is a method of increasing the recording density by making the track width variable and making the track pitch finer on the outer circumferential side. (For example, patent application Hei TCL-8033
No. 5) FIG. 6 is a diagram showing the configuration of the variable track width storage device described in the above-mentioned patent application Hirasoto No. 1-80335. 1 is a magnetic disk which is a type of rotary recording medium; 2 is a head for recording and reproducing signals on the magnetic disk; 3 is a head support mechanism for supporting the head; 4 is a conversion mechanism for converting rotational motion into linear motion; 5 is a motor that generates rotational motion. The head support mechanism 3, conversion mechanism 4, and motor 5 form a head moving means.

As shown in FIG. 6, the head moving direction and the radial direction of the magnetic disk 1 intersect at a predetermined angle, and the head 2 is attached at a predetermined angle with respect to the head moving means. , it is possible to configure a storage device with different track widths on the inner and outer circumferential sides.

In the figure, the feature of the structure is that the areal recording density is kept constant by reducing the track width on the outer circumferential side. However, at this time, the linear recording density and rotation speed are constant.

Both of the above two structures were designed to achieve high density by focusing on the track pitch.

Problems to be Solved by the Invention However, the conventional guard panless recording shown in FIGS. 4 and 5 has a problem in that heads having two different azimuth angles are required.

Furthermore, in the variable track width storage device shown in Fig. 6 above, guard panless recording is possible using a single head, but there are problems such as an increase in the moving range of the head and the azimuth sensitivity of the reproduced signal on the inner circumference side. There were problems such as the increase in size. Particularly, when attempting to correct the azimuth sensitivity using the conventional method, a means for moving the head in a direction perpendicular to or in a rotational direction with respect to the feeding mechanism in the theta direction of the head (W-axis direction in FIG. 6) is required.

The present invention solves these conventional problems,
An excellent head and track width that enables guard panless recording with a single head, and also minimizes deterioration of the reproduced waveform caused by azimuth loss on the inner circumferential side in variable track width storage devices. The purpose is to provide a variable storage device.

Means for Solving the Problems In order to achieve the above object, the magnetic recording/reproducing head of the present invention uses a head with a curved head gap and has an azimuth angle between adjacent tracks.

In addition, the variable track width storage device of the present invention uses a head with a curved head gap, and uses a feeding mechanism in the theta direction of the head to minimize azimuth loss caused by temperature and humidity expansion of the rotary recording medium. This is something I tried to suppress.

Function: According to the magnetic recording/reproducing head of the present invention, since guard panless recording can be performed using a single head, the number of heads can be reduced to one, which is half of the conventional head.

Further, according to the variable track width storage device of the present invention, the occurrence of azimuth loss can be corrected by the theta direction feeding mechanism, and fine adjustment of azimuth, which could not be achieved with the configuration of the conventional variable track width storage device, can be realized.

EXAMPLE Hereinafter, a magnetic recording/reproducing head according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a magnetic recording/reproducing head according to an embodiment of the present invention. In FIG. 1, 7 is a curved head gap. The head structure shown in FIG. 1(a) constitutes a curved head gap. In addition, Fig. 1 (b
) is the head structure shown in FIG. 1(a) viewed from above.

As shown in the figure, by making the head gap a curved line (particularly a circular arc in the case of the figure), the azimuth angle at both ends of the head gap becomes an angle that violates the track forming direction. Therefore, at adjacent track ends, the recording direction has an azimuth angle, making guard panless recording possible.

As described above, according to the above embodiment, since the head grab shape is a curve, it is possible to provide an azimuth angle at both ends of the head gap, and there is an advantage that guard panless recording can be performed with a single head.

FIG. 2 shows a variable track width storage device according to an embodiment of the present invention. In Figure 2, each component is the sixth
This is similar to the conventional example shown in the figure. The only difference is the gap shape of the head 2.

When data is recorded on the magnetic disk 1 with the configuration shown in Figure 2,
It will look like Figure 3. In Fig. 3, (a) shows the recorded state of the track pattern on the innermost circumference, and (b) shows the recorded state of the track pattern on the outer circumference side (C
) indicates the recording state when the head is moved to the optimum position. In the figure, the arc-shaped portion filled with black means the head gap. In the configuration shown in FIG. 6, when the magnetic disk l becomes larger due to thermal expansion or the like, an azimuth angle occurs between the head gap and the recording pattern as shown in FIG. 6(b). By moving the head to the optimal position as shown in (c), it is possible to reproduce a waveform whose amplitude is reduced by the loss corresponding to the portion where the gap protrudes from the track pattern. As is clear from the figure, when the head gap structure of the present invention is used, the theta direction (W-axis direction in Figure 2)
Azimuth changes during recording and playback can be adjusted by slight movement to the

Effects of the Invention As is clear from the above embodiments, the present invention has a magnetic recording/reproducing head with a curved gap shape, and can realize guard panless recording and azimuth adjustment functions in variable track width storage devices. It has the advantage of

[Brief explanation of drawings]

FIG. 1 is a diagram of the shape of a magnetic recording/reproducing head according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a variable track width storage device according to an embodiment of the present invention, and FIG. 3 is a diagram of the configuration of a variable track width storage device according to an embodiment of the present invention. A state diagram of track pattern recording using a magnetic recording/reproducing head, Figures 4 and 5 are head gap shape diagrams used in conventional guard panless recording, and Figure 6 is a diagram of the configuration of a conventional variable track width storage device. It is. 1...Magnetic disk, 2...Head,
3...Head support mechanism, 4...Conversion mechanism, 5...Motor 6...Linear head straddle, Ma...Curve shaped head gap.

Claims (3)

[Claims] (1) A magnetic recording/reproducing head characterized in that the head gap is curved. (2) The magnetic recording/reproducing head according to claim (1), wherein the head gap is arcuate. (3) A rotating magnetic recording medium having different track widths on the inner and outer circumferential sides, a head for recording and reproducing information on the rotating magnetic recording medium, and a head that moves the head to track on the rotating magnetic recording medium. and a head moving means forming a
A variable track width storage device, wherein the head has a head gap formed in a curved shape.