JPH05342842A - Rotary disk type storage device - Google Patents

Abstract

PURPOSE:To provide the rotary disk type storage device of high accuracy and high density by reducing off-track due to thermal deformation and enhancing head positioning accuracy. CONSTITUTION:A disk housing 9 and housings 10a, 10b on the side of a head driving means are combined in the vicinity of a disk center, and an end plate part of the disk housing 9 on the side of the head driving means is made freely relatively displacable. By this method, thermal deformation of the disk housing 9 is prevented from being transmitted to the housings 10a, 10b on the side of the head driving means, so that the off-track due to a difference between thermal deforming amts. of the disk housing 9 on the side of a motor and on the opposite side of the motor is reduced. Consequently, the head positioning can be carried out with high accuracy, and hence the rotary disk type storage device of high density can be provided.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary disk type storage device, and more particularly, it stacks a plurality of disks and positions a head by using servo information stored in a specific disk among them. Servo surface Servo type magnetic disk device

2. Description of the Related Art Conventionally, this type of device has been disclosed in Japanese Patent Publication No. 4-8872.
As described in the publication, attaching a rib to the housing,
Although the device is formed integrally to increase the rigidity, the thermal deformation of the housing is not considered so much, and it is dealt with by devising the cooling only to reduce the temperature rise. The causes of heat generation are wind loss of the disc, friction loss of the bearing, and loss of the motor, and in particular, heat generation from the motor causes an asymmetric temperature distribution in the housing. This asymmetrical temperature distribution causes a difference in the amount of deformation of the housing, causing a relative positional deviation between the disk and the head (this is called off-track). This was an unavoidable phenomenon in the conventional structure in which the motor was on one side of the disk.

The above-mentioned prior art has problems that cannot be avoided due to its structure, and it is difficult to make the temperatures on the motor side and the non-motor side of the apparatus uniform only by cooling. The object of the present invention is to provide a structure in which even if the temperature of the apparatus is not uniform, the difference in the amount of deformation due to this is not transmitted to the head drive means side, that is, highly accurate rotation that does not change the relative positional relationship between the disk and the head. The object is to provide a disk storage device.

In order to achieve the above-mentioned object, the present invention provides a disc, a drive means for the disc, and a circle for rotatably supporting both ends of the disc and the disc drive means. In a rotary disk type storage device comprising a plate housing, a head for reading and writing data stored in the disk, and a drive means for the head, the head drive means is fixed to a housing on the head drive means side, The joint portion between the disc housing and the housing on the side of the head drive means is composed of a fixed portion and a relative displaceable portion.

According to the above construction, even if the end plate portion of the disk housing facing the disk is thermally expanded due to the heat generated by the bearing and the motor, the housing member supporting the head driving means is located near the disk center. Since it is connected to the disk housing and the head drive means side of the end plate portion and the head drive means side housing can be displaced relative to each other, the deformation of the end plate portion is caused in the head drive means side housing. I don't get it. As a result, off-track due to the difference in the amount of thermal deformation of the housing does not occur.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of an embodiment of a rotating disk type storage device of the present invention. FIG. 2 is a vertical cross-sectional view of the disc housing of the embodiment of the present invention. FIG. 3 is a top view of the rotary disk type storage device of the embodiment of the present invention. FIG. 4 is a cross-sectional view of FIG. The feature of this embodiment is that the disk housing 9 and the housings 10a and 10b on the side of the head drive means are connected on a line passing through the center of rotation of the disk 1 in the drawing.
As can be seen from the longitudinal sectional view of the disk housing 9 shown in FIG. 2, the side surface of the housing 10a on the side of the head driving means is relatively displaceably covered. The reason for having such a structure is shown below. The disk housing 9 sandwiches the disk from both sides, and one of the housings is provided with disk drive means. FIG. 4 shows a cross sectional view. The heat transferred to the disk housing 9 is due to the windage loss of the disk 1, the loss of the bearing 13, and the loss of the disk drive motor 11. However, since the heat generated by the disk drive motor 11 is asymmetric with respect to the disk housing 9, the disk housing 9 does not deform symmetrically. For this reason, when the disc housing 9 and the housing 10a are not provided with a joint portion which is relatively displaceable as in the present invention, the relative position between the disc rotary shaft and the entire head 3 changes. When the positioning of the head 3 is performed by the servo information stored in a specific disc, the data head is displaced. This is called off-track due to thermal deformation. If this off-track amount is large, it causes a data read / write error. When using the head positioning method generally called data surface servo,
The occurrence of off-track leads to an increase in head positioning time. In the above phenomenon, the head drive means is the housing 10
It occurs because it is fixed to a or 10b. The same phenomenon occurs regardless of whether the head driving means is a linear type or a rotary type. As shown in FIG. 1, the connecting point between the disc housing 9 and the housing 10a is on a line passing through the disc rotation axis,
In particular, by arranging on the line orthogonal to the line connecting the head drive means and the center of the disc, the relative positional relationship between the disc and the head can be configured not to change due to asymmetric deformation of the disc housing 9. .. However, it is necessary that the side surfaces of the disc housing 9 and the housing 10a are not joined. Therefore, it is necessary to make a coupling that allows relative displacement. In order to achieve this relatively displaceable connection, it is possible to combine with a clearance, but in reality it is necessary to seal the inside of the device to the outside, and a material with sufficiently low rigidity, such as a rubber member, is interposed between them. By inserting
A relatively displaceable connection with the seal is achieved. In FIG. 3, the seal member is indicated by the part number 12. In addition, this deformable connection can be achieved not only by the method of connecting in the direction of relative sliding or the method of connection using shear deformation shown in the embodiment, but also by the butting of the surfaces using compression deformation of the elastic member. In any case, it is essential that the bonding site be in a direction perpendicular to the laminating direction of the discs. FIG. 5 is a side view of the housing of the latter embodiment of the method.

According to the present invention, the disc housing and the housing on the side of the head drive means are connected near the center of the disc,
Further, by making the head drive means side of the end plate portion of the disc housing relatively displaceable, thermal deformation of the disc housing is not transmitted to the head drive means side housing, so that the motor side and the non-motor side of the disc housing are Since off-track due to the difference in the amount of thermal deformation can be reduced, the head can be positioned with high accuracy, and a high-density rotating disk storage device can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a disk storage device of the present invention.

FIG. 2 is a vertical cross-sectional view of the disc housing of the embodiment of the present invention.

FIG. 3 is a top view of an embodiment of the disk storage device of the present invention.

4 is a cross-sectional view of FIG.

FIG. 5 is a side view of the housing according to the embodiment of the present invention.

[Explanation of symbols]

1 ... Disc, 2 ... Arm, 3 ... Head, 4 ... Carriage,
5 ... Guide bearing, 6 ... Guide path, 7 ... Head drive magnet, 8 ... Head drive coil, 9 ... Disc housing, 10
a, 10b ... Head driving means side housing.

Claims (1)

[Claims] 1. A disk, a drive means for the disk, a disk housing for rotatably supporting both ends of the disk and the disk drive means, and reading and writing data stored in the disk. In a rotating disk type storage device comprising a head and a drive means for the head, the head drive means is fixed to a housing on the head drive means side, and the disk housing and the housing on the head drive means side are joined together. A rotary disk type storage device, characterized in that the part is composed of a fixed part and a part which can be displaced relative to each other.