JPS6355776A - Disk driving device - Google Patents

Abstract

PURPOSE:To position the height of a disk receiving face with high accuracy by permitting magnetic attracting force to attract a disk receiving part and a rotary shaft in the direction of a chassis, supporting them by a thrust receiving screw and finely adjusting said screw. CONSTITUTION:The magnetic attracting force is generated between a permanent magnet 12 fixed in a fly wheel 4 and an iron substrate 13 arranged on the chassis 1, attracts the disk receiving part 4 and the rotary shaft 3 in the direction of the chassis. Both of them are supported by the thrust receiving screw 14. By rotating the screw 14, the height of the disk receiving part is modified. Consequently the receiving screw 14 is appropriately rotated to be finely adjusted, whereby the face height of the disk receiving part 5 can be positioned with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a spindle portion in a disk drive device such as a floppy disk device.

[Conventional technology]

A conventional disk drive device is as shown in FIG. The spindle motor 11 is a rubber belt.The rotational torque of the spindle motor is transmitted to the flywheel through the rubber belt, and further rotates the magnetic disk through the rotating shaft and the disk receiving portion.

As can be seen from the figure, in the conventional disk drive device, the flywheel and the disk receiving section are respectively arranged on opposite sides of the chassis.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, the flywheel and the disk receiver are placed on opposite sides of the chassis, which takes up space for parts on both sides of the chassis. This hinders miniaturization and thinning. Also, in the assembly process, first one part is attached to the bearing (in other words, the rotating shaft is press-fitted into the flywheel).
- After insertion, the other part (disc holder) must be fixed to the rotating shaft by gluing or press-fitting on the opposite side of the chassis, but this process is inefficient;
In addition, it is difficult to control the height of the end surface of the disk receiver, and poor height accuracy of the disk receiver worsens the conditions for the head to touch the magnetic disk, leading to deterioration in the performance of the disk drive device. the law of nature<.

The present invention is intended to solve these problems, and its purpose is to provide a disk drive device that has a simple structure, is easy to assemble, is small and thin, is low cost, and has good disk positioning accuracy. That's true.

Means for Solving Problem c] The disk drive device of the present invention includes at least a chassis, a bearing fixed to the chassis, a rotating shaft supported by the bearing, a flywheel, and a permanent magnet fixed to the flywheel. , a disk drive device comprising a disk receiving portion integrated with the flywheel, an iron substrate fixed to the chassis, and a thrust receiving screw attached to the inner peripheral portion of the bearing, the permanent magnet and the iron substrate; The flywheel, the disk receiver, and the rotating shaft are attracted toward the chassis by the magnetic attraction force generated between the , characterized in that the height of the disk receiving portion is made variable.

[Implementation [MJ] Figure 1 is a main sectional view of a disk drive device in an embodiment of the present invention, in which 1 is a chassis, 2 is a bearing, 3 is a rotating shaft, 4 is a flywheel, and 5 is a disk receiving part. As can be seen from one figure, the flywheel 4 and the disk receiving part 5 are constructed as an integral part made of the same material. Further, 6 is a permanent magnet installed inside the disk receiving portion, and 7 is a drive bin. The magnetic disk is positioned by the attractive force of the permanent magnet 6 and the driving force of the drive pin 7.

Further, 8 is a spindle motor, 9 is a spindle fixing screw, 10 is a motor pulley, and 11 is a rubber belt. The rotational torque of the spindle motor 8 is determined by the rubber belt 1.
1 to the flywheel 4 and disk receiving part 5, and the magnetic disk is rotationally driven. Further, 12 is a permanent magnet installed on the inner periphery of the flywheel 4, and 13 is an iron board placed on the circular chassis facing this magnet. The shift flywheel 4 and the disk receiver 5 are attracted in the thrust direction by the magnetic attraction force generated between the permanent magnet 12 and the iron substrate 13. The thrust bearing screw 14 arranged to support this suction force is a screw. As shown in FIG. By appropriately rotating the thrust receiver with the screw 14', the height of the end surface of the disk receiver 5 can be finely adjusted, and optimal head touch conditions can be achieved. Moreover, the permanent magnet 12 and the iron substrate 13 are as follows.

It not only generates a thrust suction force, but also generates a frequency voltage (referred to as an 'IPG signal) for controlling the rotational speed of the disk. That is, a permanent stone 12 is inserted into the fit shown in FIG.
In addition, as shown in FIG. 2, a comb-like circuit pattern 15 is formed on the iron substrate 13.

These two are opposed to each other with a small gap between them, and an induced voltage with a frequency proportional to the rotational speed of the flywheel, that is, FG
The double signal occurs in the comb tooth pattern 15.

this? The voltage applied to the spindle motor 8 from the control circuit is controlled based on the G multiplied signal frequency, and the rotational speed of the spindle motor 8, that is, the rotational speed of the flywheel 4, is kept constant. Further, such an Il'G signal generating mechanism may be provided inside the spindle motor 8 without leaving the scope of the present invention.

FIG. 4 is a main sectional view of a disk drive device according to a second embodiment of the present invention, in which 1 is a chassis, 2 is a bearing, and 3 is a main sectional view of a disk drive device according to a second embodiment of the present invention.
4 is a rotating shaft, 4 is a flywheel, and 5 is a disk receiving portion. Further, 6 is a permanent magnet installed inside the disk receiving portion, and 7 is a drive pin. Further, the permanent magnet 13 is made of an iron substrate, and the flywheel 4 and the disk receiving portion 5 are attracted in the thrust direction by the magnetic attraction force generated between the two. 9% 14 is a thrust receiving screw. Also.

Reference numeral 17 denotes a circuit board, and a comb tooth pattern and a drive circuit pattern similar to those shown in FIG. 11 and FIG. 15 are printed on its upper surface. Further, 18 is a drive coil. Here, permanent magnet 12
As shown in FIG. 5, the driving magnetic pole 19 and P
The magnetic poles for G signal generation and use are magnetized. That is, in the first implementation row, the flywheel is rotationally driven from a separate spindle motor via a belt, whereas in the second implementation row, a direct drive motor is configured in which the flywheel is a rotor. ing.

〔Effect of the invention〕

As described above, according to the present invention, at least a chassis, a bearing fixed to the chassis, a rotating shaft supported by the bearing, a flywheel, a permanent magnet fixed to the flywheel, and a permanent magnet integrated into the flywheel. In a disk drive device that includes a disk bearing portion that is fixed to the shaft, an iron substrate fixed to the chassis, and a thrust bearing screw attached to the inner circumferential portion of the bearing, a problem occurs between the permanent magnet and the iron substrate. The flywheel, the disk receiver, and the rotating shaft are attracted toward the chassis by the magnetic attraction force, the attraction force is supported by the thrust receiver screw, and the thrust receiver screw is rotated, so that the disk receiver By making the height variable, it is possible to realize a disk drive device that has a simple structure, is easy to assemble, and is small, thin, and low in cost. In addition, since the height of the top surface of the disk receiving portion can be easily and accurately managed, head touch conditions are improved, which improves disk positioning accuracy, leading to improved performance of the disk drive device.

The first practical effect of the present invention is on dogs.

[Brief explanation of the drawing]

FIG. 1 is a main sectional view showing an embodiment of a disk drive device of the present invention. FIG. 2 is a plan view of the iron substrate that constitutes the working interest. FIG. 3 is a plan view of the permanent magnets forming the implementation row tm. FIG. 4 is a main sectional view showing a second embodiment of the disk drive device of the present invention. FIG. 5 is a plan view of the permanent magnets constituting the second real m-row. Figure 6 is a main sectional view showing a conventional disk drive device. 1...Chassis 2...Bearing 3...Rotating shaft 4...Flywheel 5...-Disk receiving portion 12...Permanent magnet 13/Fist/Iron board 14...Thrust receiving screw or more

Claims (1)

[Claims] At least a chassis, a bearing fixed to the chassis, a rotating shaft supported by the bearing, a flywheel, a permanent magnet fixed to the flywheel, a disk bearing part integrated with the flywheel, and a rotating shaft supported by the bearing. In a disk drive device comprising a steel substrate and a thrust receiving screw mounted on the inner circumferential portion of the bearing, the flywheel and the disk receiving portion are and a disk drive characterized in that the rotating shaft is attracted toward the chassis, the suction force is supported by the thrust receiving screw, and the height of the disk receiving portion is made variable by rotating the thrust receiving screw. Device.