JPH0630542A - Spindle motor for magnetic disc drive - Google Patents

Abstract

PURPOSE:To provide a spindle motor for magnetic disc drive in the field of office automation in which problem of low productivity is solved and assembling properties are enhanced by improving power supply connection structure between a motor drive circuit board and an exciting coil in the motor. CONSTITUTION:A sleeve socket contact 14 is employed as means for penetrating through a bracket and connecting between the inside and the outside of a motor electrically. A hole 4b for passing the sleeve socket contact 14 is made through the bracket 4 and the sleeve socket contact 14 is inserted into the through hole 4b and secured in place. When the bracket 4 is made of conductive material, an insulating member 4c is placed between the bracket 4 and the sleeve socket contact 14. Consequently, a power supply connection structure having simple structure and excellent in airtightness is realized and diversified magnetic disc drives can be manufactured at high productivity through a simple automatic assembling machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor used in a magnetic disk drive in the field of office automation and having an improved power supply connection structure.

[0002]

2. Description of the Related Art In recent years, devices such as HDDs and FDDs in the field of office automation have been increasingly required to be small, thin and have high performance. Among them, a spindle motor used for a magnetic disk drive device to rotate a magnetic disk ( (Hereinafter abbreviated as a motor) is also required to be small, thin, and have high performance as well as high productivity.

A conventional motor for a magnetic disk drive will be described below with reference to the drawings.

FIG. 4 is a sectional view of a conventional motor, FIG. 5 is a plan view thereof, and FIG. 6 is a partial sectional side view when a magnetic disk is attached to the conventional motor. In the figure, 1 is a stator core, 2 is an exciting coil, 3 is a printed wiring board, 4
Is a bracket, 5 is a rotor magnet, 6 is a rotor frame, and 7 is a bearing. The exciting coil 2 is electrically connected to the printed wiring board 3. On the other hand, the bracket 4 is provided with a through hole 4b, and the printed wiring board 3 is guided to the outside of the motor through the through hole 4b and connected to the motor drive circuit board 9 via the connector 8. At this time, in order to prevent the dust from entering the inside of the motor, that is, the clean area where the magnetic disk 10 exists from the outside of the motor through the through hole 4b, and reducing the reliability of information recording / reproducing on the magnetic disk 10, a sealing adhesive is applied. It is configured to be sealed by 11 to maintain airtightness.

In the motor constructed as described above, an alternating current is supplied to the exciting coil 2 to generate a rotating magnetic field in the stator core 1, and the rotor magnet 5 and the rotor frame 6
Then, the magnetic disk 10 fixed to the rotor frame 6 with the disk clamp 12 and the screw 13 is rotated.

[0006]

However, in the above-mentioned conventional structure, the work of penetrating the printed wiring board 3 through the through hole 4b is complicated because the connector 8 is connected to the end of the printed wiring board 3 on the drive circuit side. It takes a long time. Furthermore, the work of sealing the through hole 4b is performed by the through hole 4b.
Since there is no choice but to be deformed, it is customary to apply the sealing adhesive 11 and then cure it from both sides of the printed wiring board 3 twice, which requires a lot of working time and careful inspection. . As described above, there is a big problem in the conventional power supply connection structure of the motor, and it has been strongly desired to fundamentally improve the power supply connection structure.

The present invention is to solve the above problems,
An object of the present invention is to provide a spindle motor for a magnetic disk drive, which can be easily assembled with high precision by an automatic assembly machine and which can be applied to various magnetic disk drives.

[0008]

In order to achieve the above object, the present invention is an improvement of the power supply connection structure as follows. That is, the sleeve socket contact is used as a means for electrically connecting the inside and outside of the motor through the bracket. The bracket has a through hole through which the sleeve socket contact passes, and the sleeve socket contact is fixed through the through hole so that the end of the exciting coil is electrically connected to the sleeve socket contact.

[0009]

With this structure, all the components relating to the electrical connection can be assembled by simply inserting them from the direction perpendicular to the bracket surface, and extremely easy and high-speed production is possible. it can. With respect to the airtight structure, the outer shape of the sleeve socket contact is generally a circular cross section with a small diameter, so that the airtightness can be easily ensured by performing a light press-fitting assembly. When electrically connecting the exciting coil and the sleeve socket contact with the printed wiring board inside the motor, it is possible to further improve the airtightness by covering the joint with solder when electrically connecting the sleeve socket contact. is there.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a magnetic disk drive motor according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3a is a partial cross-sectional side view of a magnetic disk mounted on the motor. FIG. 4 is a partial rear view of the motor.

1 to 3, members having the same functions as those of the conventional example shown in FIGS. 4 to 6 will be described with the same reference numerals.

As shown in FIG. 1, a metal bracket 4
A through hole 4b is formed in the through hole, and the sleeve socket contact 14 is fixed through the insulating member 4c. The terminal (not shown) of the exciting coil 2 is electrically connected to the sleeve socket contact 14 by solder 15 via a power supply pattern (not shown) on the printed wiring board 3. Reference numeral 16 in FIG. 3 denotes a power supply pin fixed to the motor drive circuit board 9 for inserting and fitting into the sleeve socket contact 14 to supply power to the exciting coil 2.

In such a structure, since the outer shape of the sleeve socket contact 14 is circular in cross section, the outer shapes of the through hole 4b and the insulating member 4c can be made circular, so that the workability of assembly is good. By making the fitting portion a slight interference fit, it is possible to maintain the assembly position and obtain airtightness.

Although the present embodiment has been described only with respect to a spindle motor for a magnetic disk drive, which is composed of a circumferentially opposed magnetic field type motor having a stator core, the technique disclosed in the present invention is applied to a torque generating mechanism such as a surface opposed magnetic field type coreless motor. It can be applied to a spindle motor for a magnetic disk drive regardless of the type.

[0016]

As is apparent from the above embodiments, according to the present invention, a power supply connection structure having a simple structure and good airtightness can be realized between the motor drive circuit board of the magnetic disk drive device and the inside of the motor. It is possible to bring a dramatic improvement in productivity to both the motor manufacturer and the disk drive manufacturer. When the motor is manufactured, all the parts are assembled by inserting the bracket in a direction perpendicular to the bracket, and the complicated assembly work and assembly device described in the conventional example are not required. Even when manufacturing the disk drive device, in the conventional example, manual work was indispensable for connecting the connector to the motor drive circuit board, but in the structure of the present invention, the sleeve socket contact is fixed with high positional accuracy, Moreover, since it is perpendicular to the motor drive circuit board, it is easy to connect the power supply pins of the motor drive circuit board using a simple automatic assembly machine. Further, for example, even if the distance between the motor drive circuit board and the motor is different, it is only necessary to change the length of the power supply pin, and the motor of the same design can be used for various magnetic disk drive devices.

[Brief description of drawings]

FIG. 1 is a sectional view of a spindle motor for a magnetic disk drive according to an embodiment of the present invention.

FIG. 2 is a plan view of the spindle motor for the magnetic disk drive device.

FIG. 3A is a partial cross-sectional side view of the magnetic disk drive device spindle motor with a magnetic disk attached. FIG. 3B is a partial rear view of the magnetic disk drive device spindle motor.

FIG. 4 is a sectional view of a conventional spindle motor for a magnetic disk drive.

FIG. 5 is a plan view of a spindle motor for the magnetic disk drive device.

FIG. 6 is a partial sectional side view showing a state in which a magnetic disk is attached to the spindle motor for the magnetic disk drive device.

[Explanation of symbols]

 2 Excitation coil 3 Printed wiring board 4 Bracket 4b Through hole 9 Motor drive circuit board 14 Sleeve socket contact 16 Power supply pin

Claims (2)

[Claims] 1. An excitation coil and a bracket, a sleeve socket contact is fixed through the bracket, and a power supply pin fixed to a motor drive circuit board outside the motor is inserted and fitted into the sleeve socket contact. A spindle motor for a magnetic disk drive, which is configured to supply power to the exciting coil. 2. The magnetic disk according to claim 1, wherein a printed wiring board is provided on a surface of the bracket facing the exciting coil, and the exciting coil and the sleeve socket contact are electrically connected by the printed wiring board. Spindle motor for drive unit.