JPH07111748A - Spindle motor - Google Patents

Abstract

PURPOSE:To easily extnernally guide leads by providing relay connectors at which a plurality of electrodes are disposed at a stationary member, and bringing ends of connecting terminals into pressure contact with each other to be electrically connected. CONSTITUTION:Four coil leads 30 extended from an electric element coil 47 of a stator 4 are extended out of a motor through an insulation bush 19 correspondingly provided at a base 29 of a housing 2. A printed circuit board (relay connecting circuit board) 12 is adhered to a bottom 13 of the housing 2, and the leads 30 are electrically connected to lands 25 of the board 12 by soldering, etc. A connecting terminal 8 for externally conducting is provided on an electric connector 42 from the land 25 to the end through a conductive pattern 41 on the board 12. That is, a protrusion 35 of an electrode 16 is brought into pressure contact with an external electrode to be electrically connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor for rotating a recording member such as an optical / magnetic disk.

[0002]

2. Description of the Related Art The inside of a drive unit in which a recording disk such as an optical / magnetic disk is housed is filled with clean air. The spindle motor that rotates the recording disk
A sealing process is performed so that unclean air such as a lubricant existing inside the motor does not leak to the outside of the motor, that is, the accommodation chamber. The spindle motor includes a stationary member fixed to a driving device such as a bracket or a housing, a stator provided on the stationary member, a rotor hub on which a disk is mounted, a rotor magnet mounted on the rotor hub, and a stationary member. And a bearing interposed in the rotor hub, and the rotor hub is driven to rotate relative to the stationary member. Further, a magnetic fluid seal device or a labyrinth seal structure for sealing the inside and outside of the motor is provided at a portion outside the bearing of the spindle motor.

[0003]

In the spindle motor having the above structure, for example, a stator is mounted on a fixed shaft, a pair of bearings are mounted so as to sandwich the stator, and a rotor hub is rotatably supported via the bearings. There is a so-called fixed shaft type spindle motor. In this type of spindle motor, the coil lead wire drawn out from the stator is led out of the motor through a through hole provided in the shaft. For this reason, this drawing process is time-consuming and various proposals have been made in the past, but there is no countermeasure for this and some improvement has been required. The same applies to the sealing process for sealing the inside and outside of the motor at this lead-out site.

The present invention has been made in view of the above problems existing in the prior art. The problem is that the coil lead wire of the stator can be easily led out of the motor. Another object of the present invention is to provide a spindle motor capable of effectively sealing the lead-out portion of the coil lead wire to the outside of the motor and improving workability and reliability.

[0005]

In order to achieve the above object, a spindle motor of the present invention is characterized in that, in claim 1, a stationary member, a rotor hub which is rotatably supported by the stationary member, and the stationary member are provided. In a spindle motor comprising a stator provided and a rotor magnet provided on the rotor hub so as to face the stator; the stationary member is provided with a relay connection part in which a plurality of electrodes are arranged in a predetermined manner, A coil lead wire drawn from the stator is electrically connected to the relay connection portion, and a connection terminal portion having a flexible electrode at an end portion is electrically connected, and the end portion of the connection terminal portion is A spindle motor is provided, which is characterized in that the coil lead wire is electrically energized as required by being pressed against and electrically connected to the supply electrode.

According to another aspect of the present invention, a stationary member, a rotor hub that is rotatably supported by the stationary member, a stator provided on the stationary member, and a rotor provided on the rotor hub facing the stator. A spindle motor including a magnet; and the stationary member,
A collar-shaped portion that projects outward in the radial direction is provided, and on this collar-shaped portion, a printed circuit board that electrically leads the coil lead wire pulled out from the stator to the outside of the motor is mounted. In the spindle motor, the coil lead wire connection portion and the motor lead-out portion are provided by bending with the collar-shaped portion sandwiched therebetween.

Further, according to a third aspect of the present invention, a fixed shaft, a rotor hub that is rotatably supported by the fixed shaft, a stator fixed to the fixed shaft, and a rotor hub that faces the stator are provided on the rotor hub. A spindle motor including a rotor magnet; the fixed shaft is provided with a hole penetrating from a corresponding portion at least where the stator is mounted to one end of the fixed shaft, and the coil lead drawn from the stator. The wire is led out to the outside of the motor through the hole, and a protruding portion that extends outward in the radial direction is provided on the opening side of the fixed shaft from which the coil lead wire is led. A spindle characterized in that a coil lead wire is regulated radially outward and is led out from the fixed shaft end portion. Over data is provided.

Further, according to a fourth aspect of the present invention, a fixed shaft, a rotor hub that is rotatably supported by the fixed shaft, a stator fixed to the fixed shaft, and a rotor hub that faces the stator are provided on the rotor hub. A spindle motor including a rotor magnet; the fixed shaft is provided with a hole penetrating from a corresponding portion at least where the stator is mounted to one end of the fixed shaft, and the coil lead drawn from the stator. The wire is led out to the outside of the motor through the hole, and the insertion hole of the coil lead wire in the fixed shaft is filled and closed with an adhesive that fixes the fixed shaft and the stator. A featured spindle motor is provided.

Further, according to claim 5, a fixed shaft, a housing in which the fixed shaft is provided upright,
A rotor hub that is relatively rotatably supported by the fixed shaft;
A spindle motor comprising: a stator fixed to the fixed shaft; and a rotor magnet provided on the rotor hub so as to face the stator; A cutout is provided up to the end of the fixed shaft, and a printed circuit board is provided in the cutout so as to be led to the outside of the motor from the cutout. The coil lead wire drawn from the stator is the printed circuit board. A spindle motor is provided which is electrically connected to the motor and has a seal member for sealing the inside and outside of the motor interposed in a gap defined by the cutout portion and the housing.

[0010]

According to the spindle motor of the first aspect, the coil lead wire from the stator is electrically connected to the relay connection portion in advance, and the relay connection portion has a connection terminal having a flexible electrode at an end thereof. Parts are electrically connected. Therefore, the stator is electrically connected to the power supply electrode from the outside of the motor only by pressing the connection terminal portion (the electrode portion thereof).
Further, the sealing process inside and outside the motor can be easily performed by the connection terminal portion itself or by fixing.

According to the spindle motor of the second aspect, in the printed circuit board led out to the outside of the motor, the coil lead wire connecting portion and the outside of the motor lead portion are provided by bending the brim portion of the stationary member with scissors. Has been. For this reason,
It can be electrically fixed in advance to the printed circuit board, and can be easily fixed in that state by sticking it to the collar-like portion, and it does not require any trouble to lead the printed circuit board out of the motor. When the inside and outside of the motor are sealed, the mounting portion of the printed circuit board can be easily treated with a sealing member or the like. At that time, since the electric connection portion and the lead-out portion are separated and the inside and outside of the motor are separated, a reliable sealing process can be performed.

According to the spindle motor of the third aspect, a protruding portion extending outward in the radial direction is provided on the opening side of the fixed shaft through which the coil lead wire is led out. The lead wire is regulated outward in the radial direction and is led out from the fixed shaft end portion. For this reason, even when the coil lead wire lead-out side of the fixed shaft is fixed and closed by the housing or the bracket, the coil lead wire can be led out while avoiding the closed portion of the fixed shaft. Therefore, it can be easily led out, and the sealing means can be easily provided.

According to the spindle motor of the fourth aspect, the insertion hole of the coil lead wire of the fixed shaft is filled and closed by the adhesive agent for fixing the fixed shaft and the stator. That is, when the stator is inserted into the fixed shaft by previously applying the adhesive including the amount required for the fixed shaft and the stator to be bonded together with the amount of blocking to the fixed shaft, the fixed shaft and the stator are Due to
The squeezed adhesive is filled in the insertion hole of the coil lead wire. Therefore, it is only necessary to insert the coil lead wire,
Further sealing treatment can be omitted.

According to the spindle motor of the fifth aspect, the coil lead wire pulled out from the stator is electrically connected to the printed circuit board led out of the motor from the cutout portion of the fixed shaft, and thus is easily led out. Derivation processing is possible. The gap between the notch and the housing can be easily sealed by simply inserting a seal member.

[0015]

Embodiments of the spindle motor according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a first embodiment of a spindle motor that rotationally drives a magnetic disk, for example, and shows an overall cross section thereof. In FIG. 1, a member 2 is a housing that is mounted and fixed to a drive device (not shown). The housing 2 has a shallow dish shape,
It is composed of a flat base portion 29, a flange portion 26 protruding outward from the base portion 29 in the radial direction, and a cylindrical boss portion 20 formed radially inward of the base portion 29. The housing 2 is formed of aluminum alloy or the like into a predetermined shape. The stator 4 is fixed to the step portion 34 provided on the outer peripheral side of the boss portion 20.

The stator 4 includes a stator core 46 formed by laminating a predetermined number of electromagnetic steel sheets, and the stator core 4
6 and the armature coil 47 wound a required number of times,
As shown in the figure, the inner peripheral portion 36 on the lower side of the stator core 46 and the step portion 34 of the boss portion 20 are fixed by adhesion.
Further, one end of the fixed shaft 1 is fitted and fixed in a hole 38 provided on the inner peripheral side of the boss portion 20 in the housing 2. Then, the screw is fixed to the mounting hole portion 15 formed in the collar portion 26 and fixed to the drive device.

The member 3 is a rotor hub on which a magnetic disk is mounted and, for example, magnetic stainless steel is used. The rotor hub 3 has an inverted bowl shape with an air-core center portion,
A ring-shaped magnetic disk (not shown) is fitted and mounted on the outer peripheral portion 33 of the outer peripheral wall 48. Outer wall 4
On the lower side in the drawing of FIG. 8, an annular supporting portion 40 further protruding outward is provided, and the supporting portion 40 receives the magnetic disk. Therefore, the base portion 1 of the rotor hub 3
The magnetic disk is tightly fixed to the rotor hub 3 when it is screwed into the clamp screw hole 21 provided in No. 4 using a clamp (not shown).

The rotor hub 3 has a cylindrical portion 24 that hangs radially inward from the base portion 14, and a pair of ball bearings 6 is provided between the cylindrical portion 24 and the outer peripheral portion 22 of the fixed shaft 1. , 7 are provided in between. A cylindrical rotor magnet 5 is fixed to the inner peripheral portion 37 of the outer peripheral wall 48 of the rotor hub 3 by adhesion, and the rotor magnet 5 is arranged to face the stator 4 in the radial direction.

The rotor magnet 5 is provided with N poles and S poles alternately magnetized in the circumferential direction so that the required number of poles is magnetized.
A lower end surface 14 of the base portion 14 inside the rotor hub 3,
A seal holding member 9 is provided between the rotor magnet 5 and the upper end thereof. Here, the seal holding member 9 will be described with reference to FIG. 4 shows the seal holding member 9, FIG. 4 (a) is a plan view, and FIG. 4 (b) is FIG.
It is sectional drawing in XX 'of (a). 1 and 4
In the above, the seal holding member 9 is made of a thin steel plate, and is formed by plastic working such as press working.

The seal holding member 9 is provided with four cut-and-raised portions 17 in a 90-degree rotational symmetry on the outer peripheral end of the annular base portion 27. The cut-and-raised portion 17 is formed in a substantially trapezoidal shape in cross section, and a tip end portion 39 thereof (hereinafter, referred to as a contact portion 39) contacts the upper end of the magnet 5. That is, the cut-and-raised portion 17 of the seal holding member 9 defines the gap size between the lower end surface 14 inside the rotor hub 3 and the upper end of the rotor magnet 5, and thus functions as a spacer that defines the mounting height position of the rotor magnet 5. Since the rotor magnet 5 has a cylindrical shape, the abutting portion 39 may be provided with at least three base portions 27 that define a plane. In this embodiment, the contact portion 39 has a substantially trapezoidal cross section so as to come into surface-contact with the rotor magnet 5, but in addition to this, it comes into point-contact with the rotor magnet 5.
The cross-sectional shape may be triangular or arcuate.

The abutment portion 39 allows the magnetic centers of the stator core 46 and the rotor magnet 5 to be easily aligned with each other, and the dimensions are set by plastic working even when different types of these length dimensions and shapes are used. You can easily respond to changes. Then, the seal holding member 9 has the base 2
7 covers the lower end surface 23 of the rotor hub 3, closes the clamp screw holes 21, and also functions as a seal member for sealing the inside and outside of the motor. That is, the clamp screw hole 21 in the rotor hub 3 is provided so as to allow the treatment liquid to sufficiently penetrate into the clamp screw hole 21 when the surface treatment of the rotor hub 3 is performed. Therefore, the penetrating clamp screw hole 21 is reliably closed by the base portion 27 of the seal holding member 9. Moreover, since the contact portion 39 of the base portion 27 is held and fixed by the rotor magnet 5, the base portion 27 is not peeled off or dropped from the lower end surface 14. As a result, the inside and outside of the motor are reliably sealed.

Further, the seal holding member 9 is made of a magnetic material. Although this is not applied to the present embodiment, when the rotor hub 3 is formed of a non-magnetic material such as an aluminum alloy, the magnetic flux from the rotor magnet 5 and the stator 4 is generated by the rotor hub 3. It passes through the upper part and leaks to the magnetic disk side. However,
The seal holding member 9 can effectively shield the magnetic flux that is about to leak. That is, the seal holding member 9
Also functions as a magnetic shield member.

FIG. 2 is a bottom view of the spindle motor of FIG. 1 as seen from the bottom of the drawing. 1 and 2, the four coil lead wires 30 drawn from the armature coil 47 of the stator 4 pass through the corresponding insulating bushes 19 provided on the base portion 29 of the housing 2 to the outside of the motor (the housing of FIG. 1). 2 (lower side). A printed circuit board (relay connection circuit board) 12 is attached to the bottom surface portion 13 on the lower side of the housing 2 outside the motor. Each coil lead wire 30 is electrically connected to the land portion 25 of the printed circuit board 12 by soldering or the like.

The land portion 2 is provided on the printed circuit board 12.
Electrical connection part 4 from 5 through the conductive pattern 41 to the end
2, a connection terminal 8 for supplying power from the outside is provided. The perspective view shown in FIG. 3 shows how the connection terminals 8 are mounted on the printed circuit board 12. As shown in FIG. 3, in the connection terminal 8, four electrode portions 16 are integrally formed on a base portion 31 formed of an insulating resin material. The electrode portion 16 has a substantially U shape, and the center portion thereof is positioned with the base portion 31 (the groove portion 44 thereof) as a substantially center.

That is, the lower end portion 43 which is one end of the electrode portion 16
Is electrically connected to the electrical connection portion 42 of the printed circuit board 12 by soldering or the like, and the projection 35 (contact 35) provided on the upper end 49 at the other end is pressed against an external electrode (not shown). Electrically connected. As the electrode portion 16, a base material such as phosphor bronze plated with a noble metal is used.
Therefore, only by connecting the connection terminal 8 of the spindle motor to the power supply electrode of the magnetic disk drive device, the electric connection can be surely made, and the labor required for the connection can be saved. In addition, since there is a high degree of freedom in the corresponding positions that can be connected and the range thereof, even if the drive device has different connection specifications, the use range is expanded without limitation.

In FIG. 1, the magnetic fluid seal 10 is provided on the inner peripheral side of the annular projection 45 formed on the upper end of the rotor hub 3.
Are attached via a holding member 32 made of a non-magnetic material. The magnetic fluid seal 10 prevents the lubricant of the (upper) ball bearing 6 and the impure air inside the motor from leaking out of the motor (upward in the drawing). Similarly,
Leaky air from the (lower) ball bearing 7 is prevented from leaking by the labyrinth seal structure having the following configuration. The cylindrical portion 24 of the rotor hub 3 and the inner peripheral portion 3 of the stator core 46
6 and a minute gap between the support portion 40 of the rotor hub 3 and the flange portion 26 of the housing 2.

Further, in order to seal the inside and outside of the motor, the end portion of the insulating bush 19 which is the lead-out portion of the coil lead wire 30 is sealed by adhering the printed circuit board 12 itself, and the insulating bush 19 is sealed. It is also possible to seal the part by filling it with an adhesive or the like. These can be easily sealed from the outside of the motor. The above magnetic fluid seal 1
The member 11 provided on the upper part of 0 is the magnetic fluid seal 10
It is a protective cap that prevents foreign matter from entering the seal layer from being destroyed.

Next, FIG. 5 shows a second embodiment of the spindle motor according to the present invention, and shows the entire cross section of the spindle motor for rotationally driving the magnetic disk. In FIG. 5, the fixed shaft 61 is integrally formed with a small diameter portion 89 on which the pair of ball bearings 79 and 80 are mounted and a large diameter portion 62 fixed to the cylindrical member 86. The fixed shaft 61 is provided with a through hole 95 penetrating in the axial direction, and a screw 90 is formed at one end on the upper side in the drawing. This screw 9
A part of the disk drive device (not shown) is screwed and fixed to 0.

The rotor hub 66 is rotatably supported via ball bearings 79 and 80 mounted on the fixed shaft 61. The rotor hub 66 of this embodiment also has substantially the same structure as the spindle motor of the first embodiment and is made of the same material. A different point is a clamp attachment method (not shown), which will be described below. That is, the rotor hub 66
An annular protrusion 74 is formed on the upper part of the, and a screw portion 72 is provided on the outer peripheral side of the annular protrusion 74. When the clamp is screwed onto the screw portion 72 in an externally fitted shape, the magnetic disk (not shown) mounted on the outer peripheral portion 75 of the rotor hub 66 is tightly clamped by the support portion 78 and the clamp. Fixed.

A cylindrical rotor magnet 70 is fixed to the inner peripheral portion 65 of the rotor hub 66 by adhesion or the like. The rotor magnet 70 includes the step portion 9 provided on the inner peripheral portion 65.
1 is positioned and arranged in the axial direction. The stator 69 faces the rotor magnet 70.
Are fixed to the cylindrical member 86. The stator 69 has a stepped portion 76 formed in a cutout shape on the outer peripheral side of the cylindrical member 86.
Is fixed to.

The inner peripheral side of the fixed cylindrical member 76,
A small gap is set between the rotor hub 66 and the cylindrical portion 92. Further, a minute gap is provided between the inner peripheral portion 88 of the stator core 69 located on the upper side thereof and the cylindrical portion 92, so that these configurations are combined to form a labyrinth seal structure. Also, the rotor hub 66
A labyrinth sleeve 81 that defines a minute gap with the outer peripheral portion 84 of the fixed shaft 61 is attached to the inner peripheral side of the annular protrusion 74. Therefore, these sealing means prevent the impure air existing inside the spindle motor from leaking to the outside.

On the outer peripheral side of the lower part of the cylindrical member 86,
A thin plate-shaped support member 68 formed of a steel material or the like is fixed. The support member 68 is formed corresponding to the shape of the printed circuit board 64 attached to the lower side of the figure (that is, the outside of the motor). Fixed to the cylindrical member 86,
The corresponding portion of the support member 68 is provided with an engaging portion 67 protruding upward in the drawing. Then, the engaging portion 67 is fitted and fixed to the outer peripheral portion 73 of the cylindrical member 86.

The coil lead wire 63 drawn from the stator 69 is provided so as to hang downward from the left side in the drawing. Corresponding to the hanging portion of the coil lead wire 63,
The support member 68 is provided with a collar portion 82. A part of the printed circuit board 64 is bent upward from the bottom of the drawing, and the flange-shaped portion 82 is attached by being folded back to the upper surface side of the flange-shaped portion 82. That is, a continuous portion of the printed circuit board 64 attached to the outside of the motor is bent and sandwiched with the collar-shaped portion 82, and is guided to the inside of the motor. Then, on the surface of the folded-back portion 85 where the printed circuit board 64 is bent, the electrical connection portion 9 is formed.
3 are provided, and the stator 6 is connected to the electric connection portion 93.
The coil lead wire 63 hung from 9 is electrically connected by solder or the like.

In the second embodiment, the printed circuit board 64 is separated by the support member 68 (that is, the collar portion 82) into the electrical connection portion (93) and the lead portion 94,
An electrical connection (93) is provided inside the motor.
For this reason, since there is no protruding portion such as solder on the outside of the motor, when the spindle motor is mounted on the drive device, it does not affect the height positioning, and it is electrically insulated from the outside of the motor. It is possible to secure sufficient safety above. Further, the electric connection portion 93 of the printed circuit board 64 can be electrically connected in advance, and in that state, the electric connection portion 93 can be attached and fixed to the supporting member 68 (and the collar portion 82), so that the electric connection can be easily performed. At the same time, there is no need to take out the printed circuit board 64 to the outside of the motor.

Further, in the present embodiment, the labyrinth seal structure is adopted as the seal member for sealing the inside and outside of the motor. When it is necessary to seal, the mounting portion of the printed circuit board can be easily treated with a sealing member or the like. At this time, the electric connection portion and the lead-out portion are separated, and further, the electric connection portion is provided inside and outside the motor, so that reliable sealing can be achieved and workability can be improved.

By the way, in this embodiment, the fixed shaft 6
1 integrally has a large diameter portion 62 for fixing the cylindrical member 86. Therefore, the following benefits can be obtained when assembling the spindle motor. That is, the rotor magnet 70 is attached to the rotor hub 66 in advance, and then the ball bearings 79 and 80 (each outer ring portion) are attached and fixed to the rotor hub 66, and the fixed shaft 61 is attached to these ball bearings 7.
It is fixed by passing it through 9, 80 (each inner ring part). As a result, the rotor hub 66 is rotatably supported by the fixed shaft 61, and is assembled as a so-called rotary drive unit.
On the other hand, on the fixed side of the disk drive device, the cylindrical member 86 to which the stator 69 is attached is previously fixed together with the support member 68. At that time, the coil lead wire 63 from the stator 69 is connected to the printed circuit board 6 according to the method described above.
Connect to 4. This is assembled as an electric system unit.

Therefore, the rotation drive unit and the electric system unit can be easily assembled by fitting the fixed shaft 61 into the cylindrical member 86. That is, an inwardly projecting step portion 71 is provided on the lower inner peripheral portion of the cylindrical member 86, and the large diameter portion 62 (fixed shaft 61) is fitted and fixed to the step portion 71. . At this time, the large diameter portion 62 is received at the axial position by the step portion 71, and the height of the fixed shaft 61 is positioned. That is, the height of the rotor hub 66 that receives the disk is determined. In this way, since the rotary drive unit and the electric system unit can be independently assembled, management of parts and management in manufacturing become easy.

Next, FIG. 6 shows a spindle motor of a third embodiment according to the present invention, and shows an entire cross section of a spindle motor for rotationally driving a magnetic disk. In FIG. 6, the fixed shaft 101 is fitted and fixed to a bracket 102 having a substantially disc shape at its lower portion.
The spindle motor is screwed to the screw hole 124 of the fixed shaft 101 at its upper portion, and screwed to the screw hole 118 provided at the peripheral portion of the bracket 102 at the lower portion of the motor to be fixed to the drive device.

In the spindle motor of this embodiment, the stator 104 is mounted on the fixed shaft 101 at substantially the center thereof. In the fixed shaft 104, this stator 1
A pair of ball bearings 106 and 107 are mounted on both sides (upper and lower sides in the figure) so as to sandwich 04. The substantially cylindrical rotor yoke 110 has a ball bearing 106 on the upper side of the drawing.
And rotatably supported by the ball bearing 107 via a bush 117 (spacer 117) on the lower side of the drawing. The rotor yoke 110 is made of a magnetic material such as steel, and has a small diameter portion 115 and a large diameter portion 120 formed coaxially. Then, the cylindrical rotor magnet 105 arranged to face the stator 104 is fixed to the large-diameter portion 120.

A rotor hub 103 is fitted and fixed to the outer peripheral side of the rotor yoke 110. The rotor hub 103 is made of, for example, an aluminum alloy. In order to prevent distortion / deformation of the rotor hub 103 due to a difference in thermal expansion with the rotor yoke 110, the rotor hub 103 and the rotor yoke 110 are fitted and fixed only at a substantially central portion in the axial direction. Therefore, in the other portions of the both, a slight gap is provided over the entire circumference.
The outer shape and configuration of the rotor hub 103, the mounting method of the magnetic disk, and the like are substantially the same as those of the first embodiment already described, and thus the description thereof is omitted. The rotor hub 103
In, the portion 108 is a screw hole for mounting the clamp. The part 122 is a rotation-stopping hole used to prevent the rotor hub 103 from rotating when the clamp is attached.

A magnetic fluid seal 121 for sealing the upper portion of the spindle motor is fixed to the rotor yoke 110 via a holding member 111 on the upper side of the drawing in this embodiment. A labyrinth seal structure for sealing the lower part of the spindle motor is provided on the lower side of the figure. The labyrinth seal structure is formed by an annular bush 117 and a bracket 102. That is, a small gap is formed in the radial direction between the annular protrusion 109 protruding downward from the bush 117 and the annular groove 116 provided in the bracket 102.

The stator 104 is axially positioned and fixed by a collar portion 113 provided in the substantially central portion of the fixed shaft 101. The collar portion 113 has a diameter increased in the circumferential direction and is formed integrally with the fixed shaft 101.
The collar 113 may have a similar structure by fitting and fixing another ring-shaped member. The corresponding portion of the fixed shaft 101 on which the stator 104 is mounted, that is, the stator 1 in the figure.
A hole 129 penetrating to the lower end of the fixed shaft 101 is provided at a corresponding portion of the fixed shaft 101 that is close to the lower part of 04. The coil lead wire 126 pulled out from the stator 104 is led out of the motor through the hole 129.

Lower end 13 of fixed shaft 101 in the figure
7 is provided with a screw hole 114 and is screwed to the magnetic disk drive device, the coil lead wire 126 led out from the hole 129 cannot necessarily be pulled out to the outside of the motor. However, in this configuration, the fixed shaft 101 from which the coil lead wire 126 is drawn out
A notch portion 138 extending in the radial direction (right side in the drawing) and to the lower end of the fixed shaft is provided in the lower part of the outer peripheral portion 128, and a protruding portion 127 extending outward in the radial direction is provided on the outer peripheral portion 128.
Is provided. As a result, as shown in the drawing, the coil lead wire 126 is guided outward in the radial direction (rightward in the drawing) from the notch 138 while being restricted by the protrusion 127 at the lower end of the fixed shaft 101. . Further, the coil lead wire 1 is attached to the bottom surface 123 of the bracket 102.
A recess 139 is provided so that the guide 26 can be easily led out, and the recess 139 and the protrusion 127 form a guide path.

Thus, at the end of the fixed shaft 101,
Even if there is a screw portion 114 or the like that prevents the coil lead wire 126 from being drawn out, the protrusion 127 prevents the coil lead wire 126 from being drawn.
Can bypass this and lead it out of the motor. In addition, the coil lead wire 126 is
It is also possible to prevent the electrical insulation from being damaged by the contact of the screws attached to the connector 4. It should be noted that it is desirable to use a ring member having a high electric insulation property for the protruding portion 127, and various resin materials can be adopted. The protrusion 127 is not limited to the ring shape as in the present embodiment, and may have an arc shape that does not reach the entire circumference. The protrusion 127 may be provided at least in the portion of the fixed shaft 101 from which the coil lead wire 126 is led out, and in the direction thereof. Furthermore, the protrusion 127 may be formed integrally with the fixed shaft 101.

By the way, in the spindle motor of this embodiment, the inside and outside of the motor are sealed by the labyrinth seal structure and the magnetic fluid seal device 121 described above.
Further, the hole 129 through which the coil lead wire is drawn out from the stator 104 is also sealed. As shown in the figure, the opening 132 into which the coil lead wire 126 on the fixed shaft 101 is drawn is provided with an adhesive 132 filled therein. As a result, the hole 129 is closed. Particularly, as in the present embodiment, the end portion of the fixed shaft 101 has a complicated shape due to the existence of the protrusion 127 and the notch 138, and when the sealing process is difficult, the above process is used to simplify the process. In addition, a reliable sealing process can be realized. The procedure of the sealing method will be described below.

FIG. 7 is an enlarged cross-sectional view of an essential part showing a state in which the stator 104 is inserted into the fixed shaft 101 and fixed in the spindle motor shown in FIG. Figure 7
In FIG. 6, the same parts and members as those in FIG. 6 have the same reference numerals. As shown in FIG. 7A, when fixing the stator 130 to the fixed shaft 101, an adhesive agent 132 is applied to the shaft outer peripheral portion 128, and the stator 104 is mounted from the top (indicated by the arrow) downward. insert.
As for the adhesive 132, the stator 104 is fixed shaft 101
To the final position (that is, the lower end 140 of the stator core 130 is the upper end 1 of the collar 113 of the fixed shaft 101).
41 is applied to the shaft outer peripheral portion 128 in a range above it. The coil lead wire 126 is inserted in the hole 129 in advance.

As a result, when the stator 104 is inserted and moved downward in the drawing, the stator core 1
Excess adhesive interposed between the inner peripheral part 131 of 30 and the shaft outer peripheral part 128 moves downward while being squeezed by both. Then, as shown in FIG. 7B, when the lower end 140 of the stator core 130 comes into contact with the upper end 141 of the flange 113 of the fixed shaft 101, excess adhesive 132 is applied.
Are filled in the opening 112 of the hole 129. And
The opening 112 is closed. That is, the adhesive 132 is applied to the fixed shaft 101 in advance in addition to the necessary amount for fixing the stator 104 to the fixed shaft 101 by adhesion, and the necessary amount for filling and closing the opening 112.

Therefore, in this embodiment, when the stator 104 is bonded and fixed to the fixed shaft 101, the opening 112 into which the coil lead wire 126 is inserted is also closed at the same time. Therefore, it is possible to omit performing a separate sealing process on the hole 129 of the fixed shaft 101, and
A reliable sealing process can be realized. The adhesive 132 is made of, for example, a thermosetting type, and is heated and cured after adhesion. In addition to the sealing process using the above-mentioned extra adhesive agent 132, the coating process of the stator core 130 is also performed in this embodiment. This process will be described below.

FIG. 9 is an enlarged perspective view showing the stator core 130 of the stator 104 used in FIGS. 6 and 7. In the stator core 130 shown in FIG. 9, illustration of armature coils is omitted. Generally, the stator core 130 is
An insulating coating made of a material such as epoxy resin is applied to a portion of the surface around which the armature coil is wound. However, an uncoated portion where the coating process is not performed occurs at the portion of the end surface 142 of the stator core 130 on the inner peripheral side 133. When the material of the stator core (such as an electromagnetic steel plate) is exposed to the uncoated portion 133 and is washed with water, rust is generated at this portion. Therefore, conventionally, auxiliary coating or the like has been performed on this portion.

In the present embodiment, the uncoated portion 133 is made to correspond to the lower end 140 of the stator 104 in FIG. 7 (a), so that the excess adhesive 132 is filled in the uncoated portion 133. It can be coated. As a result, the above problem can be solved, and the labor required for it can be eliminated. In addition, in the present embodiment, the fixed shaft 101
The hole 129 provided at the end may be communicated with the screw hole 124 provided at the other end (upper side in the drawing) of the fixed shaft 101. That is, a through hole may be provided that penetrates the fixed shaft 101 in the axial direction, and an adhesive may be filled in the through hole to close the fixed shaft 101.

Next, FIG. 8 shows a fourth embodiment of the spindle motor according to the present invention, and shows the entire cross section of the spindle motor for rotationally driving the magnetic disk. In the spindle motor shown in FIG. 8, similarly to the third embodiment, the stator 148 is mounted on the fixed shaft 145 at the substantially central portion thereof, and the pair of ball bearings 1 are provided on both sides of the stator 148 in the axial direction.
50 and 151 are mounted, and the rotor hub 147 is rotatably supported via the ball bearings 150 and 151. Therefore, only parts / members different from the above-described configuration will be described, and common points will be omitted.

In FIG. 8, in the fixed shaft 145, from the corresponding portion of the fixed shaft 145 to which the stator 148 is mounted to the lower end portion of the fixed shaft 145 in the figure, the cut end has a substantially rectangular shape (so-called D).
A cutout 156 is provided. This notch 1
A printed circuit board 169 is attached on the cut surface of 56. FIG. 10 is an enlarged perspective view showing the fixed shaft 145 and a state in which the printed circuit board 169 is attached to the fixed shaft 145.

8 and 10, the stator 148
The coil lead wire 160 pulled out from the lower part of the is electrically connected to the electrical connection portion 163 of the printed circuit board 169 by soldering or the like. A conductive pattern 173 is provided on the printed circuit board 169 so as to extend outward from the electrical connection portion 163 along the lead-out portion 172. Therefore,
By simply electrically connecting the coil lead wire 160 to the printed circuit board 169, the coil lead wire 160 can be easily led out to the outside of the motor.

In the present embodiment, in order to seal the inside and outside of the motor, the labyrinth sleeve 174 is provided on the upper side of the spindle motor in the figure so that the annular projection 1 of the rotor hub 147 is provided.
It is fixed to 61. This Labyrinth Sleeve 174
And the outer peripheral portion 155 of the fixed shaft 145 are set to a minute gap, whereby a seal structure is formed.
A labyrinth seal structure is also formed on the lower side of the spindle motor in the figure.

That is, the bush 164 for holding the outer ring side of the ball bearing 151 has an annular small diameter portion 162 provided on the inner peripheral side thereof so as to project inward in the radial direction, and faces the small diameter portion 162. The housing 146 has a step 16
5 is formed. Similarly, a minute gap is provided between the small diameter portion 162 and the step portion 165, whereby a labyrinth seal structure is formed. The fixed shaft 14 on which the printed circuit board 169 is provided
Since a slight gap is also formed in the notch 156 of No. 5, the seal member 168 having contractibility for closing this gap.
Are provided intervening.

As the seal member 168, it is possible to use, for example, one formed by laminating a fluororesin PTFE (polytetrafluoroethylene) on a support base of polyethylene scrim or polyester non-woven fabric. The seal member 168 is reliably sealed only by interposing it in the gap. In this way, the inside and outside of the motor are sealed, so that the impure air inside the motor is prevented from leaking to the magnetic disk storage chamber outside the motor.

Although the four examples of the spindle motor according to the present invention have been described above, design changes and modifications can be freely made without departing from the spirit of the present invention. For example, the spindle motor of the present invention may be configured as a stationary member, a housing or a bracket fixed to the stationary shaft, or the base member itself that defines the disk drive device. Further, although the spindle motor for rotationally driving the magnetic disk has been described in the present embodiment, the present invention is not limited to this, and a spindle motor for rotationally driving a load such as an optical disk or a rotary double-sided mirror is also required.

[0058]

Since the spindle motor of the present invention has the above-mentioned structure, it has the following effects. That is, according to the spindle motor of the first embodiment corresponding to claim 1 of the present invention, the coil lead wire 30 from the stator 4 is electrically connected to the printed circuit board (relay connection portion) 12 in advance. A connection terminal 8 having a flexible electrode portion 16 at an end is electrically connected to a printed circuit board (relay connection portion) 12. Therefore, the stator 4 is electrically connected to the power supply electrode from the outside of the motor only by pressing the electrode portion 16 of the connection terminal 8 into pressure. Further, the sealing process inside and outside the motor can be easily performed by fixing or fixing the connection terminal portion itself.

According to the second embodiment of the invention, the printed circuit board 6 led out of the motor.
4, the coil lead wire connecting portion and the motor external lead-out portion are provided by bending the brim-shaped portion 82 of the support member 68. Therefore, the coil lead wire 63 can be electrically connected to the printed circuit board 64 in advance, and in that state, the coil lead wire 63 can be easily fixed by being attached to the collar-shaped portion 82, and the printed circuit board 64 is led out of the motor. It does not take time to do. When the inside and outside of the motor are to be sealed, the mounting portion of the printed circuit board 64 can be easily treated with a sealing member or the like. that time,
Since the electrical connection portion and the lead-out portion are separated and the inside and outside of the motor are separately provided, a reliable sealing process can be performed.

According to the third embodiment corresponding to claim 3 of the present invention, the coil lead wire 126 is led out to the fixed shaft 101 at the opening side of the end portion 137 (of the hole portion 129) toward the outside in the radial direction. The protruding portion 127 extends toward the outside, and the protruding portion 127 restricts the coil lead wire 126 outward in the radial direction and guides the coil lead wire 126 from the end of the fixed shaft 101 to the outside of the motor. Therefore, even if the coil lead wire lead-out side of the fixed shaft 101 is fixed to the housing or the bracket and is closed, the coil lead wire 126 can be drawn out while avoiding the closed portion of the fixed shaft. In addition, the coil lead wire 126 does not suffer deterioration of electrical insulation due to contact with such obstacles. Therefore, the coil lead wire 126 can be easily led out of the motor, and the sealing means can be easily provided.

According to the third embodiment of the present invention, the fixed shaft 101 is attached to the stator 104 mounting portion in an amount sufficient to bond the fixed shaft 101 and the stator 104. , And in addition to this, the amount of adhesive required to fill the insertion hole (opening 112) (where the coil lead wire 126 is inserted) is applied. As a result, the excess adhesive squeezed by the fixed shaft 101 and the stator 104 is removed by the coil lead wire 126.
Is filled in the insertion hole. Therefore, the coil lead wire 12
Only the insertion work of 6 is required, and it is possible to omit the additional sealing process. In addition to this, the stator core 130
It is also possible to carry out the coating treatment.

According to the fourth embodiment of the present invention, the coil lead wire 160 drawn from the stator 148 is led out of the motor from the cutout portion 156 of the fixed shaft 145. Since it is electrically connected to 169 and is derived, the derivation process can be easily performed. The gap between the notch and the housing can be easily sealed by simply inserting the seal member 168.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire spindle motor according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the spindle motor according to FIG.

FIG. 3 is an enlarged perspective view of a connection terminal incorporated in the spindle motor according to FIG.

FIG. 4 shows a seal holding member incorporated in the spindle motor according to FIG. 1, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is a cross section taken along line XX ′ in FIG. 4 (a). It is a figure.

FIG. 5 is a sectional view showing an entire spindle motor according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing an entire spindle motor according to a third embodiment of the present invention.

FIG. 7 shows a part of the spindle motor according to FIG. 6, and FIGS. 7 (a) and 7 (b) are sectional views showing the assembling order.

FIG. 8 is a sectional view showing an entire spindle motor according to a fourth embodiment of the present invention.

9 is an enlarged perspective view showing a part of the spindle motor according to FIG.

10 is an enlarged perspective view showing a part of the spindle motor according to FIG.

[Explanation of symbols]

 1, 61, 101, 145 Fixed shaft 3, 66, 103, 147 Rotor hub 4, 69, 104, 148 Stator 5, 70, 105, 149 Rotor magnet 10, 121 Magnetic fluid seal 30, 63, 126, 160 Coil lead wire 64,169 Printed circuit board

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Setsu Konagaya 225 Arayama Ichibanya, Mineyama-cho, Fuchu-gun, Kyoto Inside Nidec Mineyama Plant (72) Inventor Shin Hirono 225 Arayama Ichibanya, Mineyama-cho, Fuchu-gun, Japan 225 Mineyama Plant, Densan Co., Ltd. (72) Inventor Yoshikiyo Nagashima 225 Arayama Ichibanya, Mineyama Town, Fuchu District, Kyoto Nidec Mineyama Plant

Claims (5)

[Claims] 1. A stationary member, a rotor hub relatively rotatably supported by the stationary member, a stator provided on the stationary member, and a rotor magnet provided on the rotor hub facing the stator. In the spindle motor, the stationary member is provided with a relay connection part in which a plurality of electrodes are arranged in a predetermined manner, and a coil lead wire pulled out from the stator is electrically connected to the relay connection part, and an end part is provided. A connecting terminal portion having a flexible electrode is electrically connected to the coil terminal, and an end portion of the connecting terminal portion is pressure-contacted with the power supply electrode to be electrically connected, so that the coil lead wire is energized as required. A spindle motor characterized by the following. 2. A stationary member, a rotor hub relatively rotatably supported by the stationary member, a stator provided on the stationary member, and a rotor magnet provided on the rotor hub so as to face the stator. In the spindle motor, the stationary member is provided with a collar-shaped portion that projects outward in the radial direction, and the collar-shaped portion has a print for electrically leading the coil lead wire pulled out from the stator to the outside of the motor. A spindle motor, wherein a circuit board is mounted, and a coil lead wire connection portion and a motor external lead-out portion of the printed circuit board are provided by bending with the collar-shaped portion sandwiched therebetween. 3. A fixed shaft, a rotor hub that is rotatably supported by the fixed shaft, a stator fixed to the fixed shaft, and a rotor magnet that is provided on the rotor hub so as to face the stator. In the spindle motor, the fixed shaft is provided with a hole penetrating from the corresponding portion where the stator is at least mounted to one end of the fixed shaft, and the coil lead wire pulled out from the stator passes through the hole. A protruding portion that extends outward in the radial direction is provided on the opening side of the fixed shaft that is led out to the outside of the motor, and the coil lead wire is led out. A spindle motor, which is regulated in one direction and is led out from the fixed shaft end. 4. A fixed shaft, a rotor hub that is rotatably supported by the fixed shaft, a stator fixed to the fixed shaft, and a rotor magnet that is provided on the rotor hub so as to face the stator. In the spindle motor, the fixed shaft is provided with a hole penetrating from the corresponding portion where the stator is at least mounted to one end of the fixed shaft, and the coil lead wire pulled out from the stator passes through the hole. A spindle motor which is led out to the outside of the motor and in which the insertion hole of the coil lead wire in the fixed shaft is filled and closed with an adhesive that fixes the fixed shaft and the stator. 5. A fixed shaft, a housing in which the fixed shaft is erected, a rotor hub relatively rotatably supported by the fixed shaft, a stator fixed to the fixed shaft, and the rotor hub facing the stator. In the spindle motor including a rotor magnet provided in, a cutout portion is provided in the fixed shaft from a corresponding portion where the stator is mounted to one fixed shaft end portion, and the cutout portion, A printed circuit board that is led out of the motor from the cutout portion is provided, and the coil lead wire that is drawn out from the stator is electrically connected to the printed circuit board, and is a void portion defined by the cutout portion and the housing. A spindle member for sealing the inside and outside of the motor is interposed in the spindle motor. .