JP2943139B2 - Drive for magnetic disk storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive apparatus for a magnetic disk type storage device in which a magnetic disk is rotated by a spindle motor in a space where predetermined cleanliness is maintained.

[0002]

2. Description of the Related Art As shown in FIG. 10, a drive unit 100 for a conventional magnetic disk storage device has a shaft 1 at a central portion.
A spindle motor including a base plate 2 on which the base plate 2 is fixed, a stator 3 provided on the base plate 2 around the shaft 1, and a rotor 6 rotatably mounted on the shaft 1 via bearings 4, 5. A closed space (first space) 10 maintained at a predetermined cleanliness by a plate (not shown). The rotor 6 includes a hub 20, on which two magnetic disks (not shown) are mounted.

[0003] The stator core 1 is provided in the first space 10.
5 and the terminal 16a of the armature coil 16 wound around the stator core 15 and the motor drive circuit board 13 disposed in a space (second space) 25 other than the first space 10 are electrically connected to a base plate. 2 through hole 2b and insulating sheet 1
2 through the through hole 12b and the connector wire 101 inserted through the through hole 13b of the motor drive circuit board 13.

The terminal 16a of the armature coil 16 and one end of the connector wire 101 are connected to each surface of a double-sided board 17 fixed to the base plate 2 with screws 18, respectively, and the other end of the connector wire 101 is connected to the motor. It was connected to the connector 102 mounted on the drive circuit board 13.

[0005]

In the conventional drive device 100 for a magnetic disk type storage device, the use of the connector wire 101 increases the cost.
Automation of the process of connecting the connector wires 101 to the double-sided board 17 is difficult, requires many man-hours, and has the problem of increasing costs.

In addition, the connector 102 must be mounted on the motor drive circuit board 13, which causes a problem that the number of components increases and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to reduce the number of steps and costs and to easily assemble a magnetic disk storage device. It is intended to provide a driving device of the above.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a motor comprising a rotor having a magnetic disk mounted thereon and a stator having an armature coil and disposed on a base plate. In the drive device of the magnetic disk type storage device that rotates in a space kept at a predetermined cleanliness, a terminal of the armature coil disposed in the space is connected to a substrate disposed in the space, The board and the drive circuit of the motor disposed in a space other than the space are electrically connected via a connector, and the connector has metal wires arranged at equal intervals having a hardness of 40 ° or more.
The first elastic member is supported by a 60 ° first elastic member, and the first elastic member is sandwiched by a second elastic member having a hardness of 60 ° to 80 °.

It is preferable that the metal wires are arranged in at least two rows in a connection direction between the substrate and the drive circuit.

[0010]

According to the present invention, while maintaining the cleanliness of the space (first space) in which the magnetic disks are arranged, the terminals of the armature coils arranged in the first space and the space other than the first space (the second space) are arranged. The provided driving circuit is electrically connected by a metal wire constituting a connector. In addition, when the metal wires are arranged in at least two rows in the connection direction between the substrate and the drive circuit, the terminal of the armature coil and the drive circuit are more reliably electrically connected.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a longitudinal sectional view of a drive device of the magnetic disk storage device according to claim 1, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a bottom view of a double-sided board, and FIG. 5, FIG. 5 is a partially enlarged view of FIG. 4, FIG. 6 is an enlarged vertical sectional view of a main part of a drive device of a magnetic disk storage device according to claim 2, and FIG. FIG. 8 is a plan view, FIG. 8 is a partially enlarged view of FIG. 7, and FIG. 9 is a view showing the relationship between the support rubber hardness and the contact failure rate.

As shown in FIG. 1, a drive device for a magnetic disk storage device according to the first aspect of the present invention includes a base plate 2 having a shaft 1 fixed at a central portion thereof, and a stator 3 provided on the base plate 2 around the shaft 1. And a brushless motor (spindle motor) 7 including a rotor 6 rotatably mounted on the shaft 1 via bearings 4 and 5.

An enclosed space (first space) 10 is maintained at a predetermined cleanliness by the base plate 2 and the upper plate (not shown), and the stator 3 and the rotor 6 are disposed in the first space 10. ing. Reference numeral 11 denotes a cap that covers the bearings 4, 5, and the like.

A drive circuit substrate 13 on which a drive circuit for driving the brushless motor 7 is rotated is fixed to the bottom surface of the base plate 2 via an insulating sheet 12 made of an insulating member such as a resin. Insulation sheet 12
Is to insulate the base plate 2 and the drive circuit board 13 from each other.

The stator 3 includes a stator core 15 and an armature coil 16 wound around the stator core 15, and is fixed to the base plate 2 with an adhesive or the like. To electrically connect the armature coil 16 and the drive circuit board 13 to the base plate 2, a double-sided board 17 is fixed with screws 18. The double-sided substrate 17 may be fixed to the base plate 2 by a method such as bonding.

The rotor 6 has a hub 20 and a rotor yoke 21 mounted on the bottom surface of the hub 20. On the inner peripheral surface of the rotor yoke 21, a permanent magnet 22 facing the stator core 15 via a predetermined gap is fixed. . The hub 20 has 2
Two magnetic disks (not shown) are mounted. In addition,
The same components as those of the drive device 100 of the conventional magnetic disk storage device are denoted by the same reference numerals.

Armature coil 1 disposed in first space 10
6 terminal 16a and a space other than the first space 10 (a second space)
In order to electrically connect the motor drive circuit board 13 disposed on the double-sided board 25, first, the terminal 16a of the armature coil 16 is connected to one surface of the double-sided board 17 with solder 26 as shown in FIG. The connector 30 is inserted into the through holes 2a, 12a formed in the base plate 2 and the insulating sheet 12 so as to be sandwiched between the other surface 17 and the drive circuit board 13.

Next, the screw 31 is screwed into a screw hole 1a formed in the axial center of the end of the shaft 1, and the drive circuit board 13 is crimped to the connector 30 so as to be connected to the terminal 16a of the armature coil 16. The circuit board 13 is electrically connected.

FIG. 4 and FIG.
As shown in FIG. 1, the metal wire 32 includes a core rubber 33 as a first elastic member of silicon rubber, a support rubber 34 as a second elastic member, and the like. The metal wire 32 is a brass wire (about 40 μm in diameter) plated with gold (for example, 0.1 μm in thickness) and has a hardness of 40 μm.
A plurality of core rubbers are arranged in a row at equal pitches (for example, 0.1 mm pitch) in the core rubber 33 of 60 ° to 60 °. Further, the core rubber 33 is sandwiched between two support rubbers (hardness 60 ° to 80 °) 34 via an adhesive layer 35.

As shown in FIG. 3, a wiring pattern 17a is formed on the other surface of the double-sided substrate 17 on the second space 25 side. The wiring pattern 17 a faces the through hole 2 a of the base plate 2, contacts the end of the metal wire 32 by fitting the connector 30 into the through hole 2 a, and is soldered to one surface of the double-sided board 17. The terminal 16a is electrically connected to the metal wire 32 of the connector 30.

A wiring pattern (not shown) having the same shape as the wiring pattern 17a is formed on the surface of the drive circuit board 13 facing the through hole 2a of the base plate 2.
a.

Therefore, as shown in FIG.
The armature coil 16 arranged in the first space 10
Terminal 16a and a second space other than the first space 10
The drive circuit board 13 disposed in the space 25 is electrically connected to the first space 10 while maintaining the predetermined cleanliness.

As shown in FIG. 6, the drive of the magnetic disk storage device according to the second embodiment has the same configuration as that of the drive of the magnetic disk storage device according to the first embodiment except for the connector 40. .

FIG. 7 and FIG.
As shown in FIG. 1, the first elastic member is composed of a metal wire 42, a core rubber 43 as a first elastic member of silicon rubber, a support rubber 44 as a second elastic member, and the like. The metal wire 42 is a brass wire (about 40 μm in diameter) plated with gold (for example, 0.1 μm in thickness).
A plurality of the core rubbers are arranged in a row at equal pitches (for example, 0.1 mm pitch) in the core rubber 43 of 60 ° to 60 °. Further, two core rubbers 43 supporting the metal wires 42 are bonded via an adhesive layer 45, and the bonded core rubber 43 is sandwiched between two support rubbers (hardness 60 ° to 80 °) 44 via the adhesive layer 45. Have been.

Therefore, as shown in FIG.
The armature coil 16 arranged in the first space 10
Terminal 16a and a second space other than the first space 10
The drive circuit board 13 disposed in the space 25 is electrically connected to the first space 10 while maintaining the predetermined cleanliness.

The connectors 30, 40 are connected to metal wires 32,
42 is supported by relatively soft (hardness 40 ° to 60 °) core rubbers 33 and 43, and both sides thereof are sandwiched by relatively hard (hardness 60 ° to 80 °) support rubbers 34 and 44. Therefore, even if the connectors 30 and 40 are slightly inclined, the wiring pattern 17a
In addition, stable electrical contact with the wiring pattern of the drive circuit board 13 becomes possible.

FIG. 9 shows the relationship between the support rubber hardness of the connector 30 and the contact failure rate due to variations in the crimping dimensions and the inclination of the connector. Here, the contact failure rate is smallest when the hardness of the support rubber 34 is in the range of 60 ° to 80 °. This is because if the support rubber 34 is set relatively hard (hardness 60 ° to 80 °), it is possible to flexibly cope with variations in crimping dimensions and inclination of the connector 30 with respect to the double-sided board 17 and the drive circuit board 13. It is. Further, in the connector 40 in which the metal wires 42 are arranged in two rows, the contact failure rate is further smaller than in the connector 30.

[0028]

As described above, according to the present invention, since the board and the drive circuit of the motor are directly connected by the connector composed of the metal wire and the elastic member, the connection operation between the terminal of the armature coil and the drive circuit is performed. Can be easily automated, and the number of connection operations can be reduced. In addition, due to the flexibility of the connector, strictness is not required for the mounting posture of the connector, and stable electrical contact with the board and the drive circuit is possible even when the connector is mounted with a slight inclination.

Since the connector is made of an elastic member, the vibration generated by the rotation of the motor is attenuated between the connector and the drive circuit, so that the vibration and noise can be reduced.

When the metal wires are arranged in at least two rows in the connection direction between the substrate and the drive circuit, the problem of poor contact due to variations in crimping dimensions and inclination of the connector with respect to the substrate or the drive circuit is dramatically increased. Be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a drive device of a magnetic disk storage device according to claim 1.

FIG. 2 is an enlarged view of a main part of FIG. 1;

FIG. 3 is a bottom view of the double-sided board.

FIG. 4 is a plan view of the connector according to claim 1;

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is an enlarged longitudinal sectional view of a main part of a drive device for a magnetic disk storage device according to claim 2;

FIG. 7 is a plan view of the connector according to claim 2;

8 is a partially enlarged view of FIG. 7;

FIG. 9 is a diagram showing a relationship between a support rubber hardness and a contact failure rate.

FIG. 10 is a longitudinal sectional view of a drive device of a conventional magnetic disk storage device.

[Description of Signs] 1 ... shaft, 2 ... base plate, 3 ... stator,
4, 5 bearing, 6 rotor, 7 brushless motor, 1
0: first space, 12: insulating sheet, 13: drive circuit board, 15: stator core, 16: armature coil, 16a
... Terminal of armature coil, 17 ... Double-sided board, 17a ... Wiring pattern, 20 ... Hub, 21 ... Rotor yoke, 22 ... Permanent magnet, 25 ... Second space, 26 ... Solder, 30, 40 ... Connector, 31 ... Screw, 32, 42 ... metal wire, 33,
43 ... core rubber (first elastic member), 34, 44 ... support rubber (second elastic member), 35, 45 ... adhesive layer.

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 3/30-3/52 G11B 19/20 H01R 11/01 H01R 23/68

Claims (2)

(57) [Claims] A motor having a rotor on which a magnetic disk is mounted and a stator having an armature coil and disposed on a base plate is provided, and the magnetic disk is rotationally driven in a space maintained at a predetermined cleanliness. In the drive device for a magnetic disk storage device, the terminal of the armature coil disposed in the space is connected to a substrate disposed in the space, and the terminal is disposed in a space other than the substrate and the space. The drive circuit of the motor is electrically connected via a connector. The connector supports metal wires arranged at equal intervals with a first elastic member having a hardness of 40 ° to 60 °, and further includes a first elastic member. A driving device for a magnetic disk storage device, wherein a member is sandwiched between second elastic members having a hardness of 60 ° to 80 °. 2. The drive device for a magnetic disk storage device according to claim 1, wherein the metal wires are arranged in at least two rows in a connection direction between the substrate and the drive circuit.