JPS5916346B2 - magnetic disk device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a magnetic disk using a flexible magnetic disk, Ξ
This relates to a single disk device.

Conventionally, this type of magnetic disk device has a configuration in which, when the magnetic disk is rotating, a constant distance is always maintained between the magnetic disk and the magnetic head for detecting information from the magnetic disk due to airflow. A conventional example showing a specific structure between a magnetic head and a magnetic disk, which is a characteristic of the magnetic head, is shown in FIG.

That is, Figure 1 is a side view showing the relationship between the magnetic head and the magnetic disk in a magnetic disk circuit when a magnetic head is provided above the magnetic disk.
2 is a flexible magnetic disk, 2-1 is a magnetic head core provided with a gap for detecting or recording information on the magnetic disk 1, and 2-2 is a coil wound around the magnetic head core 2-1. . Here, the head core 2-1 is embedded in a slider 2-3 whose lower surface has a convex lens shape, as shown in FIG. 2, and the surface facing the magnetic disk is as shown in FIG. The core 2 is ground into an almost spherical shape until the gap is exposed.
-1 and slider 2-3 form a magnetic head section. However, the spherical shape here is a general term for ellipsoidal surfaces and all other curved surfaces, and the specific shape is appropriately selected to obtain the best recording characteristics. Slider 2-3
is held in the hole 3-1 provided at a predetermined location of the replate 3 by an adhesive 4. By the way, in the conventional structure as described above, the end portion 2-4 of the slider 2-3
As shown in FIG.
Since the disk 1 is exposed in the direction, even slight vibrations from the outside will collide with the slider end 2-4, which has a relatively sharp corner, causing an unpleasant scratch on the surface of the magnetic disk. It had the following drawback.

In particular, such problems are likely to occur when attempting to effectively utilize areas near the outer periphery of a magnetic disk as tracks. That is, the stability in the area near the outer periphery of the disk is lower than in other parts of the disk and vibrations are more likely to occur, so that the ends 2-4 of the head portion often come into contact with the disk and cause scratches. A slider is a method to improve this drawback:
One possible method is to make the end part into a rounded 2-4' shape as shown in FIG. -4', and the effect of reducing scratches on the disk surface due to collisions is not very significant.

In order to improve the above points, the magnetic disk device according to the present invention was invented, and its gist is that the slider and magnetic head core are incorporated in the slider end, which causes scratches on the disk surface. It has a structure invaginated within the pores.

FIG. 4 is a cross-sectional view of the magnetic disk device according to the present invention when viewed from the side. In the figure, the portion surrounded by dotted lines constitutes the gist of the present invention, and when the portion is enlarged, it is shown in FIG. It will be like this.

Here, in the figure, 5 is a motor for rotating the disk, 6 is a plate located below the disk, 7 is a mounting plate for installing the motor 5 inside the case, 8 is an upper cover, and 9 is a side wall of the case. 10 is a column for holding the printed board 14 supporting the lower part of the motor 5 on the case side wall plate 9; 11 is a flange provided on the drive shaft of the motor 5; 12 is a flange for attaching the disk 1 to the flange; 11 is a disk holder for attachment, 13 is a lower cover forming the bottom of the case, and other numbers are the same as those shown by the numbers in Figures 1, 2, and 3 above. It consists of parts. The structure of the present invention is as described above. According to the present invention, as shown in FIG. It is not exposed above, so even if vibrations are applied from the outside, the magnetic disk will not collide with the end of the slider and be damaged.

In the embodiment shown in FIG. 5, the radius of curvature of the spherical portion of the magnetic head section is smaller than that in FIG. 1, so the plate-disk spacing is smaller than in FIG. By enlarging the hole 3-1, and incorporating the magnetic head shown in FIG. 1 with a larger diameter while keeping the radius of curvature of the spherical portion constant, into the enlarged hole, the 6th hole 3-1 can be formed.
As shown in the figure, it is also possible to make the distance between the disk 1 and the lower surface 3'' of the plate facing it the same as in the case of FIG. It also enjoys the advantage that it does not require grinding to form the rounded slider end 2-4 as shown in Figure 3, and is easy to manufacture.
This is extremely convenient in practice. Although the embodiments of the present invention described above have a structure in which the magnetic head portion is above the magnetic disk, the same applies to a structure in which the magnetic head is below the magnetic disk.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view showing the positional relationship between a magnetic disk and a magnetic head section facing it in a conventional example of a magnetic disk device, and FIG. 2 is a top view of the magnetic head section in FIG. 3 is a schematic side sectional view showing a conventional example based on the improvement of FIG. 1; FIG. 4 is a sectional view of the magnetic disk device of the present invention when viewed from the side; FIG. 5 is a schematic side sectional view showing the positional relationship between the magnetic head section and the magnetic disk according to the gist of the present invention, and FIG. 6 is a schematic side sectional view showing another embodiment of the present invention. 1... Magnetic disk, 2-1... Magnetic head core, 2-2... Coil, 2-3...
...Slider, 2-4...Slider end, 3...Plate (board), 3''...
Plate surface, 3-1...Sorako L. 4...
·glue.

Claims (1)

[Claims] 1. In a magnetic disk device that performs recording or reproduction by rotating a flexible magnetic disk along a substrate and protruding a magnetic head section from the substrate surface in the direction of the disk, the disk facing surface of the head section is approximately spherical. 1. A magnetic disk device characterized in that the magnetic head is formed in a substantially spherical shape, and only the vicinity of the top of the substantially spherical facing surface of the magnetic head protrudes from the substrate surface toward the disk.