JPS6355775A - Disk driving device - Google Patents

Abstract

PURPOSE:To simplify a structure and to make a device compact and thin by generating magnetic attracting force between a permanent magnet and an iron substrate, attracting a disk receiving part and a rotary shaft in the direction of a chassis and supporting them by a receiving screw. CONSTITUTION:The magnetic attracting force occurs between the permanent magnet 12 fixed in a fly wheel 4 and the iron substrate 13 arranged on the chassis 1. Such a constitution is employed that the magnetic attracting force attracts the fly wheel 4, the disk receiving part 5 and the rotary shaft 3 in the direction of the chassis 1 and that all of them are supported by the thrust receiving spring 14. When the receiving screw 14 is rotated, the height of the end surface of the disk receiving part 5 can be finly adjusted. Consequently the structure is extremely simple, and a good assembling property is provided. A thin, compact driving device can be obtained with a low cost.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk drive device such as a floppy disk device.
The present invention relates to the structure of the spindle portion of the device.

[Conventional technology]

A conventional disk drive device is fitted as shown in Fig. 6. In the figure, 1 is a chassis, 2α, 2b are bearings, 3 is a rotating shaft, 4 is a flywheel, 5 is a disk receiving part, and 8 is a spindle motor. , 11 is a rubber belt.

The rotational torque of the spindle motor is transmitted to the flywheel through a rubber belt, and then to the rotating shaft.

The disc is rotated by the disc receiving part.

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 prior art described above, the flywheel and the disk receiver are placed on opposite sides of the chassis, which takes space for parts on both sides of the chassis. This hinders miniaturization and thinning. In addition, the assembly process involves first inserting one part into the bearing (for example, a flywheel with a rotating shaft press-fitted into it), and then gluing or attaching the other part (the disk holder) from the opposite side across the chassis. It must be fixed to the rotating shaft by press-fitting, etc., but this process is inefficient,
Furthermore, it is difficult to manage the height of the end face of the disk receiving portion. Poor height accuracy of the disk receiver leads to poor conditions for head contact with the magnetic disk, leading to deterioration in the performance of the disk drive device.

The present invention is intended to solve these problems, and its purpose is to provide a disk drive device that is easy to purchase, easy to assemble, small, thin, low cost, and has good disk positioning accuracy. It is to be.

Question C? Means for Solving the Problem] A 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, a permanent magnet fixed to the flywheel, and a rotary shaft mounted on the flywheel. A disk receiving portion integrated into the wheel is housed in a groove between the iron substrate fixed to the chassis, and the magnetic attraction force generated between the permanent magnet and the iron substrate causes the flywheel, the disk receiving portion and It is characterized by the rotating shaft being suction-supported in the direction of the chassis.

[Implementation row]

FIG. 1 is a main sectional view of a disk drive device according to an embodiment of the present invention, and it can be seen from FIG. 1 that 1 is a chassis, 2 is a bearing, 3 is a rotating shaft, 4 is a flywheel, and 5 is a disk receiving part Similarly, the flywheel 4 and the disk receiving portion 5 are formed as an integral part made of the same material. Further, 6 is a permanent magnet mounted inside the disk receiving portion, and 7 is a drive pin. 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 motor fixing screw, 10 is a motor pulley, and 11 is a rubber belt. The rotational torque of the spindle motor 8 is transmitted to the flywheel 4 and the disk receiving part 5 through the rubber belt 11, forming FRa in which 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 chassis so as to face this magnet. Permanent magnet 12 and iron substrate 13
The flywheel 4 and the disk receiver 5ti are attracted in the thrust direction by the magnetic attraction force generated between them. 1
The thrust receiver 4 is a screw arranged to support this suction force.As shown in Figure 4, the thrust receiver is a screw 14.

It is machined into the inner periphery of the bearing 2 and engages with a female thread.

By rotating this thrust receiver with the screw 14k:iMK, the width of the end face of the disk receiver 5 can be adjusted by a slight AI-I.
N, and optimal head touch conditions can be achieved. Furthermore, the permanent magnet 12 and the iron substrate 13 not only generate thrust attraction force, but also generate a frequency voltage (referred to as an IFG signal) for controlling the rotational speed of the disk. That is, as shown in FIG. 3, the permanent magnet 12 is magnetized with multiple poles 16, and as shown in FIG.
A comb-like circuit pattern 15 is formed on the portion 3 .

These two are opposed to each other with a small gap between them, and the induced voltage (PG) with a frequency proportional to the rotational speed of the flywheel is generated.
The voltage applied to the spindle motor 8 from the control circuit is controlled based on this yG multiplied signal frequency generated in the multiplied signal comb tooth pattern 15, and the rotational speed of the spindle motor 8, that is, the rotational speed of the flywheel 4 is kept constant. is maintained.

In addition, such an FG signal generation mechanism is installed in the spindle motor 8.
It is not beyond the scope of the present invention that the device may be provided inside the device.

FIG. 4 is a main sectional view of a disk drive according to a second embodiment of the present invention, where l is a chassis.

2 is a bearing, 3 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, reference numeral 12 denotes a permanent stone, and reference numeral 13 denotes an iron substrate.The flywheel 4 and disk receiving portion 5 are attracted in the thrust direction by the magnetic attraction force generated between the two. Also, %14 is a thrust receiving screw. Further, 17 is a circuit board with a second circuit board on its top surface.
The comb tooth pattern and drive circuit pattern of the same machine as in FIG. 15 are printed, and 18 is a drive coil. As shown in FIG. 5, the end face of the permanent magnet 12 is magnetized with a driving 1iHi 19 and an FG signal generating ffl pole. That is, in the first embodiment, the magnetic pole 1 for rotationally driving the flywheel from a separate spindle motor via a belt.
9 and the magnetic pole adder for FG signal generation are magnetized. That is, in the first embodiment, the flywheel is rotationally driven from a separate spindle motor via a belt, whereas in the second embodiment, the flywheel is a rotor and a direct drive motor is configured. ing.

〔Effect of the invention〕

As described above, the disk drive device of the present invention is provided.

at least a chassis, a bearing fixed to said chassis;
A rotating shaft supported by the bearing, a flywheel, and a permanent magnet fixed to the flywheel.

It is comprised of a disk receiving part integrated with the flywheel and an iron substrate fixed to the chassis.

The magnetic attraction force generated between the permanent magnet and the iron substrate is used to attract and support the flywheel, disk receiver, and rotating shaft toward the chassis, so the structure is simple and easy to assemble. This has the effect of realizing a small, thin, and low-cost disk drive device. Furthermore, since the height of the top surface of the disk receiving portion can be easily and accurately managed, head touch conditions are improved, and therefore disk positioning accuracy is improved, leading to improved performance of the disk drive device.

In summary, the practical effects of the present invention are significant.

[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 constituting the actual row t''. Fig. K3 is a plan view of the permanent magnets constituting the actual row A. Fig. 4 shows a second embodiment of the disk interlocking device of the present invention. Fig. 5 is a plan view of permanent magnets constituting the second implementation row. Fig. 6 is a main sectional view showing a conventional disk drive device. 1... Chassis 2... Bearing 3. ... Rotating shaft 4 - Flywheel 5 Fist/fist disk receiving part 12 ... Permanent magnet 13 ... Iron substrate 14 ... Thrust receiving screw or more Applicant: Seiko Egun Co., Ltd., -N No. 2 blades 3 figures! + 10th figure

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. A disk drive device comprising an iron substrate, wherein the flywheel, the disk receiving portion, and the rotating shaft are attracted and supported in a chassis direction by a magnetic attraction force generated between the permanent magnet and the iron substrate. .