JPH07244921A - Disk driving device - Google Patents

Abstract

PURPOSE:To obtain the disk driving device with good assembling workability and at low cost. CONSTITUTION:The disk driving device is equipped with a stationary member, a rotor hub 9 which is freely rotatable to this stationary member, a disk mounted on this rotor hub 9, a stator 13 fixed to the stationary member and a rotor magnet 12 mounted on the rotor hub 9 and opposite to the stator 13 at a slight gap. A lead wire 18 led out of the stator is clamped and fixedly held by fusing with an insulation coating member 17 using polyester resin, and the insulation coating member 17 is embedded and fixed in a guide groove 23 provided in the stationary member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a disk drive device for rotationally driving a recording disk such as a magnetic disk or a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, in a disk drive device, since a spindle motor for rotating a disk is provided in a disk accommodating chamber, electrical wiring is performed inside the device. For this reason, for example, a lead wire pulled out from the stator of the motor is laid on the base of the disk drive device, and an insulating tape or the like is attached and fixed on the lead wire.
Further, since it is difficult to attach the lead wire, recently, a flexible circuit board is often used instead of the lead wire.

[0003]

The so-called notebook type personal computers and other devices such as personal computers are becoming smaller and thinner, and the recording disk drive devices incorporated therein are also necessarily made smaller. There is a strong demand for thinner products.

Therefore, the lead wire drawn from the spindle motor for rotating the disk is inevitably thin. If the lead wire becomes thin, it is difficult to assemble because it is twisted or lifted when it is assembled into the disk, and the assembling workability deteriorates. In addition, if the lead wire is lifted, it may come into contact with the disk when the disk rotates, causing damage to the lead wire or causing an error in reading / writing the disk.

Further, recently, since it takes a lot of time to assemble a lead wire and the assembling workability is deteriorated, a flexible circuit board having a good assembling workability has been used instead of the lead wire. However, when the flexible circuit board is used, it is easy to mount on the base and the assembly workability is improved, but there is a problem that the cost is higher than that when the lead wire is used.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a disk drive device having good assembling workability and low cost. It is in.

[0007]

In order to achieve the above object, a disk drive device according to the present invention comprises a stationary member, a rotor hub rotatable with respect to the stationary member, and a disk mounted on the rotor hub. In a disk drive device including a stator fixed to the stationary member and a rotor magnet mounted on the rotor hub and facing the stator with a slight gap, a lead wire drawn from the stator is The insulating coating member made of polyester resin is sandwiched and held by welding and fixed, and the insulating coating member is embedded and fixed in the groove provided in the stationary member.

[0008]

According to the disk drive device of the present invention, the lead wire pulled out from the stator is sandwiched and held by the insulating covering member. For this reason, the lead wire is improved in electrical insulation, but is also corrected for bending and bending. Therefore, the insulating covering member can hold the lead wires in an orderly manner. Since this insulating covering member is embedded and fixed in the groove portion provided in the stationary member, it can be easily mounted, and a stable bonding site is maintained even if an adhesive is used, so that the insulating covering member is surely secured. Can be fixed.

As described above, according to the disk drive device of the present invention, it is possible to prevent the lead wire from rising. Further, the assembling workability is improved, and the cost can be kept low as compared with the case where the flexible circuit board is used instead of using the lead wire.

Further, by using a polyester resin for the insulating covering member, the lead wire can be more firmly held and held.

Further, the insulating coating member can be easily sandwiched by sandwiching the lead wire by welding and fixing.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings that follow, the same reference numerals are the same or equivalent.

FIG. 1 is a sectional view of a main part showing an embodiment of a disk drive device according to the present invention, FIG. 2 is a plan view of a base of the disk drive device, and FIG. 3 is a plan view in which lead wires are fixed by an insulating film. FIG. 4 is a cross-sectional view of a lead wire fixed with an insulating film fixed in a guide groove of a disk drive device, FIG. 5 is a plan view showing a part of a stator, and FIG. 6 is a cross-section of a terminal bush in FIG. It is a figure.

As shown in FIG. 1, the bracket 2 fixed to the base 1 of the disk drive comprises a collar portion 3 provided on the outer periphery of the lower portion and a cylindrical portion 4 positioned above it. A step portion 7 for positioning the pair of bearings 5 and 6 is formed on the inner peripheral side of the cylindrical portion 4, one bearing 5 is fitted in the upper end portion of the cylindrical portion 4, and the other bearing 6 is formed in the cylindrical portion. It is fitted in the lower end portion of No. 4.

Inside the cylindrical portion 4, a pair of bearings 5,
A shaft 8 is rotatably supported via 6. That is, the shaft 8 is inserted into the inner rings of both bearings 5 and 6,
These inner rings are bonded and fixed to the shaft 8 by applying an appropriate preload.

A rotor hub 9 made of aluminum or the like is fixed to the upper end of the shaft 8 so as to rotate together with the shaft 8. A magnetic disk (not shown) is mounted on the flange portion 10 of the rotor hub 9 and mounted on the rotor hub 9. A cylindrical iron yoke 11 is attached to the lower surface of the flange portion 10 of the rotor hub 9 by shrink fitting, and a rotor magnet 12 is attached to the inner circumference of the yoke 11.

A stator 13 is fixed to the outer periphery of the cylindrical portion 4 of the bracket 2 so as to face the rotor magnet 12 with a slight gap in the radial direction. The stator 13 is formed by stacking a required number of electromagnetic steel sheets and winding a coil around a required number of radially extending actual magnetic local portions. Therefore, due to the electromagnetic action between the stator 13 and the rotor magnet 12, the rotor hub 9 rotates about the shaft 8 and the magnetic disk rotates as required.

A cap 14 is arranged below the other bearing 6 so as to close the lower end opening of the cylindrical portion 4. This cap 14 can prevent dust from entering the hard disk. A labyrinth gap is formed over the entire circumference between the outer peripheral surface of the cylindrical portion 4 and the outer peripheral surface of the stator 13, and the lower and inner peripheral surfaces of the rotor hub 9 and the inner peripheral surface of the rotor magnet 12 which are opposed thereto. Therefore, the grease exerts a sealing effect against the scattering of grease from the bearings 5 and 6 and unclean air, and prevents these from entering the hard disk.

As shown in FIGS. 5 and 6, the terminal bush 1 made of an insulating resin is formed between the adjacent protruding magnetic pole portions of the stator 13, that is, in the slots.
5 is installed. The bush 15 is formed of an outer collar portion 20 and a cylindrical portion 21. The cylindrical portion 21 of the bush 15 has a tapered diameter, and by being inserted into the guide hole 17 provided in the collar portion 3 of the bracket 2,
The stator 13 is positioned in the circumferential direction. Stator 13
By locating, the length of the coil wire 16 drawn out from the stator 13 up to the solder can be made uniform. The coil wire 16 drawn out from the stator 13 is passed through the hole 22 of the bush 15 and electrically connected to the terminal portion 19 mounted on the back surface of the collar portion 3 by soldering or the like. The outer collar 20 provided on the upper end of the bush 15 is the stator 1.
The bush 15 itself is prevented from coming off by being caught by the tooth portion of No. 3.

As shown in FIG. 1, the coil wire 16 soldered to the terminal portion 19 is used as a relay for this terminal portion 19.
The lead wire 18 of the book is drawn out. A guide groove (groove portion) 23 for guiding the lead wire 18 is provided in the base 1 on the surface of the base 1. The guide groove 23 is the base 1
In the above, the bracket 2 is provided from the corresponding portion of the collar portion 3 toward the edge portion of the drive device, and has a rectangular cross section and a substantially L shape in a plane. By this guide groove 23, the lead wire 18 electrically connected to the terminal portion 19 is led out to the edge portion of the drive device. The lead wire 18 is adhered and held by an insulating film (insulating covering member) 25 and mounted in the guide groove 23.

The state in which the lead wire 18 is sandwiched between the insulating films 25 is shown in FIGS. That is, the three lead wires 18 are arranged in parallel so as not to overlap with each other between two thermosetting insulating films 25, which are substantially the same plane shape as the guide groove 23 and are larger than each other, and the lead wires 18 are sandwiched and held. To do. Then, both ends of the two insulating films 25 are welded by heat welding and sandwiched and fixed. As the insulating film, an insulating material such as a polyamide resin may be used in addition to the polyester resin. In particular, polyester resin is desirable in terms of workability and insulation retention. An adhesive 24 is applied to one surface of each of the three lead wires 18 fixed by the insulating film 25, and is adhesively fixed in the guide groove 23.

Although the lead wire 18 is electrically connected to the coil wire 16 via the terminal portion 19, the coil wire 16 can be directly pulled out. Further, in FIG. 4, the welded portions of the insulating film 25, that is, both ends thereof are bonded and fixed to the opening edge of the guide groove 23, but the groove bottom of the guide groove 23 may be filled with an adhesive and fixed. . Therefore, when the lead wire 18 is sandwiched by the insulating film 25, the electrical insulation is improved and the bending and bending of the lead wire 18 are corrected. Therefore, the insulating film 25 can protect the lead wires 18 in an orderly state, can be easily attached to the guide groove 23, and can be securely adhered and fixed because it does not rise from the base 1. The insulating film 25 has a flat plate shape and a wall pressure of 0.05 to 0.08 mm, and 0.02 to 0.5 mm can be adopted from the viewpoint of workability and insulation retention. The insulating film 25 is preferably welded by ultrasonic waves in addition to the above-mentioned method by heat welding. Further, it is also possible to fix it in a pressure contact state or adopt crimping fixation.

By the way, conventionally, an insulating paper is mounted on the upper surface of the collar portion 3 to insulate the coil of the stator 13 from the collar portion 3, and a through hole corresponding to the guide hole 17 is formed in this. . A terminal portion 19 is attached to the back surface of the collar portion 3 with an adhesive, and a coil wire 16 from the stator 13 is soldered to the terminal portion through a through hole. In this case, if the coil wire 16 touches the inner surface of the through hole or the inner peripheral edge of the lower end, a short circuit may occur. Therefore, an insulating tube such as rubber is fitted inside the through hole, and the coil wire 16 is inserted into the insulating tube. The coil wire 16 was kept to be insulated. However, in such a conventional structure,
Since insulating paper and an insulating tube are required to secure the insulation of the coil wire 16, there are problems that the number of parts is increased, the number of steps for assembling them is increased, and the assembling workability is deteriorated.

In view of the above problems, in the embodiment,
By using the insulating bush 15, the number of parts is reduced and the assembling workability is improved. Also, bush 15
The stator 13 can be positioned and the length of the coil wire 16 drawn out from the stator 13 up to the solder can be made uniform by interposing the guide wire 17 in the guide hole 17 of the collar 3.

Although the embodiments of the disk drive device according to the present invention have been described above, the present invention is not limited to such embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the fixed shape of the lead wire is substantially L-shaped, but any shape may be used as long as it matches the shape of the groove of the disk drive device. Although the insulating film is fixed by heat welding, it may be fixed by an adhesive.

[0026]

As described above, in the disk drive device of the present invention, the lead wire is sandwiched and held by the insulating covering member, and the lead wire is embedded in the guide groove provided in the base of the disk drive device. Since it is fixed, the assembling workability is improved, the lead wire can be prevented from rising, the lead wire can be prevented from being damaged due to contact with the disc, and the disc read / write error can be prevented. Further, the cost can be kept low as compared with the case of using a flexible circuit board.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of main parts showing an embodiment of a disk drive device according to the present invention.

FIG. 2 is a plan view of a base of the disk drive device.

FIG. 3 is a plan view showing a state in which lead wires are fixed with an insulating film.

FIG. 4 is a plan view showing a state where the insulating film is fixed.

FIG. 5 is a plan view showing a part of a stator.

6 is a cross-sectional view of the terminal bush in FIG.

[Explanation of symbols]

 1 Base 2 Bracket 9 Rotor Hub 12 Rotor Magnet 13 Stator 18 Lead Wire 23 Guide Groove 25 Insulating Film

Claims (3)

[Claims] 1. A stationary member, a rotor hub rotatable with respect to the stationary member, a disk mounted on the rotor hub, a stator fixed to the stationary member, a rotor hub mounted on the rotor hub, and slightly attached to the stator. And a rotor magnet facing each other with a gap therebetween, the lead wire pulled out from the stator is sandwiched and held by an insulating coating member, and the insulating coating member is fixed to the stationary state. A disk drive device, wherein the disk drive device is embedded and fixed in a groove provided in a member. 2. The disk drive device according to claim 1, wherein a polyester resin is used for the insulating covering member. 3. The disk drive device according to claim 2, wherein the insulating coating member sandwiches the lead wire by fusion fixing.