JP2001153135A - Air bearing having conductive mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive mechanism a structure wherein static electricity charged in a rotating member during rotation is released to a fixing member side through contact between conductive elements, suppressing a machinery loss caused by the contact of the conductive elements in early stages of starting, and having excellent wear resistance. SOLUTION: A column 2 of a conductive element is raised on a base plate 1, and a disc 3 becoming a thrust air bearing having a spiral groove on the upper surface thereof is provided directly above the base plate 1. An inner ring 4 becoming a radial air bearing is fixed on an upper part of the column 2, and an outer ring 6 of the radial air bearing is fixed on the inside of a hub 5 of the conductive element becoming a rotation driving portion. One end of a tongue piece 10a or a ring 10a of an elastic member made from the conductive element is abutted on a rotational center of the hub 5, and the other end of the elastic member 10a is locked to an upper center of the column 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing structure of a spindle motor serving as a drive device in a small storage device such as a hard disk drive device (hereinafter referred to as an HDD), and more particularly, to guide static electricity charged on a hub to a base plate side. The present invention relates to an air bearing having a conduction mechanism.

[0002]

2. Description of the Related Art Spindle motors in small storage devices such as HDDs require small size, high precision, and high rotation. Therefore, air bearings that can obtain more stable rotation from ball bearings are used for the bearing structure. Yes. The magnetic disk fixed to the hub is charged with static electricity by air friction during high-speed rotation, but in the conventional ball bearing structure, static electricity is automatically released to the fixed member side via steel balls.

However, in the air bearing, since the rotating member and the fixed member rotate in a non-contact manner, static electricity charged in the hub serving as the rotating member gradually accumulates and moves from the magnetic disk fixed to the hub to the magnetic head side. Discharge may cause damage to these devices.

[0004] Even in such an air bearing, since the rotating member and the fixed member forming the bearing portion come into contact with each other when the bearing is stopped, if both members are made of a conductive material, static electricity can be released at the time of the contact. Can be. However, static electricity accumulates during rotation. Furthermore, if both members are, for example, non-conductive ceramic materials, static electricity cannot be released during both stop and rotation.

[0005] Japanese Patent Application Laid-Open No. 11-55916 proposes means for avoiding this problem by using a magnetic fluid. FIG. 5 shows a spindle motor including an air bearing 100 having a conduction mechanism. On the base plate 101,
A support 102 made of a conductor is fixed, and the support 10 is
The inner ring 104 of the radial air bearing is fixed to the tip of the second. Hub 10 on which a magnetic disk (not shown) is mounted
Inside the inner ring 3, the discs 106 and 107 of the thrust air bearing are arranged so as to sandwich the upper and lower surfaces of the inner ring 104, between which the outer ring 105 of the radial air bearing facing the inner ring 104 at a predetermined gap is fixed. Have been. 108 is pillar 1
02, which faces the rotor magnet 109 fixed inside the hub 103.

[0006] In the operation of the spindle motor configured as described above, the hub 103 is rotated by the rotational driving force of the alternating current supplied to the coil of the stator 108. Due to this rotation, the outer ring 105 of the radial air bearing rotates, and a dynamic pressure is generated in the gap between the inner ring 104 and the inner ring 104, and at the same time, the upper end surface of the inner ring 104 and the disk 10 forming the thrust air bearing.
A dynamic pressure is generated in the gap between the disk 7 and the lower end surface of the inner ring 104 and the disk 106, and the rotating member and the fixed member of the air bearing rotate without contact.

In order to release static electricity charged on a rotating member which rotates in a non-contact manner, an air bearing 10 having this conduction mechanism is provided.
0, the magnetic plate 110 is fixed inside the hub 103,
A slight gap is provided between the magnetic plate 110 and the column 102. The gap is filled with a magnetic fluid 111, and static electricity remaining in the hub 103 is released to the base plate 101 side via the magnetic fluid 111.

By the way, in this spindle motor,
Magnet 112 and support 102 fixed inside hub 103
The air-core electromagnetic coil 113 is fixed between the magnet 112 and the air-core electromagnetic coil 113 in response to a load change of the magnetic disk mounted on the hub 103, receiving a command from a separately provided magnetic excitation adjustment circuit. In addition, the gap between the thrust bearings can be adjusted by inducing suction or repulsion.

[0009]

However, Japanese Patent Application Laid-Open No.
A problem remains in the configuration proposed in Japanese Patent No. 55916. First, the radial air bearing part (1
04 and 105) and the thrust air bearing (104)
And between 106 and 104 and 107) require the flow of air to generate a dynamic pressure, and the air suction / discharge port is connected to the hub 103 as shown by an arrow 114 in FIG. Therefore, the flow of air that generates dynamic pressure is blocked by the seal layer of the magnetic fluid 111 as is apparent from the figure.
For this reason, depending on the accuracy of the bearing portion, the conditions for using the bearing, and the quality of the sealing member used, the sealing layer of the magnetic fluid 111 may be broken by the inflowing air, and the magnetic fluid 111 may be scattered.

As another problem, when the peripheral speed of the rotating member in the portion sealed by the magnetic fluid 111 is increased to a certain degree or more, the viscous resistance of the magnetic fluid 111 filled between the fixed member and the rotating member becomes a problem. . When the viscous resistance increases, the rotational torque increases, and as a result, the power consumption increases. Furthermore, the heat generated by the frictional resistance between the magnetic fluids 111 breaks the seal layer of the magnetic fluid 111, and the magnetic fluid 1
11 may be scattered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is directed to an air bearing which rotates in a non-contact manner. To provide a structure to escape to the fixing member side. It is another object of the present invention to provide a conduction mechanism that suppresses mechanical loss due to contact of a conductor at the beginning of startup and has excellent wear resistance.

[0012]

An air bearing suitable for practicing the present invention is a circle which is a thrust air bearing having a conductive groove provided on a base plate and having a spiral groove on an upper surface immediately above the base plate. A plate is further provided, an inner ring serving as a radial air bearing is fixed above the support, and an outer ring of the radial air bearing is fixed inside a conductive hub serving as a rotary drive unit. One end of the elastic member made of the body is brought into contact with the center of rotation of the hub, and the other end of the elastic member is locked at the center of the upper portion of the support.

The elastic member may be a flexible curved tongue or a flexible ring. One end of the elastic member is in contact with the center of rotation of the hub, and the other end is in the center of the upper part of the support. Lock.

According to a second aspect of the present invention, the elastic member of the first aspect for discharging static electricity charged on the rotating member during rotation to the fixed member side is replaced by another means. In other words, a predetermined distance from the bottom of the blind hole is provided in the blind hole provided at the tip of the strut so that the headed pin having a spherical contact at the tip can move following the behavior of the rotating hub. It is inserted and urged by an elastic body so that the tip of the headed pin contacts the center of rotation of the hub. The elastic body is preferably a coil spring made of a conductor.

According to a third aspect of the present invention, the elastic member of the first aspect for discharging static electricity charged on the rotating member during rotation to the fixed member side is replaced with another means. In other words, the conductive fiber bundled and fixed inside the center of rotation of the hub is inserted into the blind hole provided at the tip of the support column so that it can move following the behavior of the rotating hub. It is stored at a predetermined distance from the bottom.

According to a fourth aspect of the present invention, the elastic member of the first aspect, which discharges static electricity charged on the rotating member during rotation to the fixed member side, is replaced by another means. In other words, the sleeve is fixed inside the center of rotation of the hub, and the spindle is guided by the sleeve, reaches a stepped portion provided at the tip of the column, and has a dynamic pressure groove on the outer periphery and has a spherical contact at the tip, The spindle is moored by stretching a stranded wire of conductive fibers fixed to the bottom of the step.

Preferably, the conductive fiber used in the third or fourth invention is boron, carbon monofilament, or tungsten.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to release static electricity charged on a rotating member to a fixed member side through contact between conductors, it is necessary to solve the following technical problems. First, the rotation torque of the hub is not increased by the contact of the conductor. Increasing the rotational torque not only causes an increase in power consumption, but also causes problems such as abrasion of contact points, transfer of abrasion points due to scattering of abrasion powder, and generation of unnecessary frictional heat. In addition, the hub, which becomes a rotating member by contact with the conductor, must not prevent the hub from floating by the action of the dynamic pressure groove of the thrust air bearing.

In particular, when the lower end of the outer ring of the radial air bearing is in contact with the disk of the thrust air bearing at the time of stop,
It is necessary to avoid an increase in starting torque due to contact between the conductors. For that purpose, it is preferable that the contacts of the conductor are separated at the time of starting. Furthermore, when assembling the rotating member and the fixed member, it is not desirable to induce misalignment due to the conductor. If the misalignment is induced via the conductor after the assembly, the gap of the radial air bearing will be uneven and smooth rotation will be hindered.

FIG. 1 is a sectional view of an air bearing having a conduction mechanism according to the first invention in which an air bearing is arranged on an upper stage and a spindle motor is arranged on a lower stage. FIG. 1A shows a case where a flexible curved tongue piece 10a is used as an elastic member made of a conductor.
(B) a flexible ring 1 is attached to an elastic member made of a conductor;
0b was used. In FIG. 1A, the upper-stage air bearing has a conductive column 2 standing on a base plate 1 and a disk 3 serving as a thrust air bearing having a spiral groove 3a on the upper surface immediately above the base plate 1.
Is provided as a guide. Further, an inner ring 4 serving as a radial air bearing is fixed to the column 2, and an outer ring 6 of the radial air bearing is fixed inside a conductive hub 5 serving as a rotation driving unit so as to be rotatably coaxial with the inner ring 4.

In the lower spindle motor, a coil 8 is wound around a stator 7 which extends radially and integrally from the body of the base plate 1, and a rotor magnet 9 is provided inside the skirt portion 5 a of the hub 5 in opposition to the coil 8. Are located. In the spindle motor configured as described above, a rotating driving force is generated by an alternating current supplied to the coil 8 of the stator 7, and the hub 5 rotates. Due to this rotation, a dynamic pressure is generated in a gap between the outer ring 6 of the radial air bearing and the opposed inner ring 4, and at the same time, the inner ring 4 forming the thrust air bearing is formed.
Disk 3 having a lower end surface 6a and a spiral groove 3a on the upper surface
, A dynamic pressure is generated in the gap, and the rotating member and the fixed member of the air bearing rotate without contact.

Therefore, unless the conduction mechanism shown in section X is provided, the static electricity charged in the hub 5 on the rotating member side gradually accumulates, and discharge between the magnetic disk fixed to the hub 5 and the magnetic head side. May occur and damage these devices.

Therefore, in FIG. 1A of the first invention,
The tip of a flexible curved tongue piece 10a made of a conductor is brought into contact with the center of rotation inside the hub 5, and the other end is a rivet 11
Alternatively, it is moored at the center of the upper part of the column 2 by means such as a drive screw. With this configuration, the hub 5
Is discharged from the tongue piece 10a to the column 2 via the rivet 11 during rotation or stoppage. The tongue piece 10a may be a thin flat spring steel, and is set to a mounting load that is lighter than the weight of the entire rotating member including the magnetic disk. The spring constant of the tongue piece 10a may be a small one that assists the rotating member that is stopped when the lower end surface 6a of the outer race 6 is in contact with the disk 3 to float, and has a mounting load equal to its own weight of the entire rotating member. If set, the lower end surface 6a of the outer race 6 and the disk 3 can be kept in non-contact during stop. As a result, torque loss due to frictional resistance between the outer ring 6 and the disk 3 at the time of startup can be eliminated.

FIG. 1B shows the tongue piece 10 of FIG.
a is replaced by a flexible ring 10b made of a conductor, and its operation and effects are the same as those described with reference to FIG.

In the conduction mechanism of the first invention, since the contact point of the tongue piece 10a or the ring 10b, which is a conductor, is located at the center of rotation of the hub 5, there is no fear of torque loss, wear and heat generation. Since the tongue piece 10a or the ring 10b is merely in contact with the inside of the hub 5 at the time of assembling, there is no danger of inducing misalignment between the rotating member and the fixed member. If the mounting load of the tongue piece 10a or the ring 10b is set to be equal to the weight of the entire rotating member, torque loss due to frictional resistance at the time of starting can be eliminated.

Next, FIG. 2 shows a second aspect of the air bearing shown in FIG. 1 in which the conduction mechanism shown in section X is replaced with another embodiment. FIG. 2A shows a basic type of the second invention, and FIG. 2B shows a modified type of the second invention.

In FIG. 2A, reference numeral 5 denotes a hub serving as a rotating member. An inner ring 4 of a radial air bearing is fixed to an outer periphery of a support member 2 which is a fixing member and made of a conductor. An outer ring 6 of a radial air bearing is fixed inside the hub 5 facing the inner ring 4. The rotation of the hub 5 configured as described above via an air bearing by a spindle motor provided in the lower stage is the same as in FIG.

In the second invention, the following conduction mechanism is provided in order to release the static electricity charged in the hub 5 to the fixing member. A headed pin 13 made of a conductor having a spherical contact at a tip thereof is inserted into a blind hole 12 at the tip of the column 2 so as to be movable following the behavior of the rotating hub. It is inserted into the hub 12a at a predetermined interval, and is urged by a coil spring 14 made of a conductor so that the tip of the pin 13 with the head comes into contact with the center of rotation inside the hub 5. One end of the coil spring 14 abuts under the neck of the headed pin 13 and the other end abuts a counterbore hole 15 provided at the tip of the support column 2 for centering.

With this configuration, the hub 5
The static electricity charged to the pole 2 from the headed pin 13 via the coil spring 14 regardless of whether it is rotating or stopped.
Escaped to the side. The spring constant of the coil spring 14 is
The rotating member that is stopped when the lower end surface 6a of the outer ring 6 is in contact with the disk 3 may be a small one that assists in floating, and if the mounting load is set to be equal to the weight of the entire rotating member, the outer ring can be stopped. It is also possible to keep the lower end surface 6a of the disk 6 and the disk 3 out of contact. As a result, torque loss due to frictional resistance between the outer ring 6 and the disk 3 at the time of startup can be eliminated.

In FIG. 2B, the configurations of the air bearing and the spindle motor are the same as in FIG. The same applies to the form of the blind hole 12 and the pin 13 with the head, and the coil spring 14 of the elastic body is housed between the bottom 12 a of the blind hole 12 and the end face of the pin 13 with the head. The static electricity charged in the hub 5 is transmitted to the support column 2 via the headed pin 13 slidably supported with a small gap in the blind hole 12 regardless of whether the hub 5 is rotating or stopped. Escaped.

In the conduction mechanism according to the second aspect of the present invention, since the contact point of the headed pin 13 which is a conductor is located at the center of rotation of the hub 5, there is no fear of torque loss, abrasion and heat generation. At the time of assembling, the headed pin 13 is merely in contact with the inside of the hub 5, so that there is no danger of inducing misalignment between the rotating member and the fixed member. If the mounting load of the coil spring 14 is set to be equal to the weight of the entire rotating member, torque loss due to frictional resistance at the time of startup can be eliminated.

Next, FIG. 3 shows a third invention in which, in the air bearing shown in FIG. 1, the conduction mechanism shown in the X section is replaced with another embodiment. 3, the configurations of the air bearing and the spindle motor are the same as those in FIG.

In the third aspect, the following conduction mechanism is provided in order to release the static electricity charged in the hub 5 to the fixing member. Counterbore 16 inside the center of rotation of hub 5
Is provided, and the conductive fibers 17 are bundled and fixed with an anaerobic adhesive or the like which is cured by ultraviolet rays, and a predetermined space is provided in the blind hole 12 provided at the tip of the column 2 with respect to the bottom portion 12a. And store it. The material of the bundled fibers 17 made of a conductor is preferably boron, carbon monofilament, tungsten, or the like.

If the outer diameter of the bundled fibers 17 is set smaller than the inner diameter of the blind hole 12 while the spindle motor is stopped, the lower end of the outer ring 6 of the radial air bearing is seated on the disc 3 of the thrust air bearing when the spindle motor is stopped. Even if it is a structure that has been done, the bundled fiber 17 and the inner diameter of the blind hole 12 are not in contact,
The starting torque is not added and the power consumption is not increased. Of course, it does not prevent the hub 5 from floating by the action of the dynamic pressure groove of the thrust air bearing.

Since the outer diameter of the bundled fibers 17 is set smaller than the inner diameter of the blind hole 12 at the time of assembly,
There is no danger of inducing misalignment between the rotating member and the fixed member.
Also, even if the tip of the bundled fibers 17 and the inner diameter of the blind hole 12 may come into contact, the fibers 17 have sufficient flexibility,
Prevents abrasion of contact points and generation of unnecessary frictional heat. If the tip of the bundled fibers 17 and the inner diameter of the blind hole 12 are in contact with each other during the stop, the static electricity charged in the hub 5 is transferred to the support 2 via the fibers 17 regardless of whether the hub is rotating or stopped. Escaped.

Usually, the number of rotations of the HDD is 12000 to 1
Since the rotation speed of the hub 5 is 8000 rpm, the tip of the conductive fiber 17 opens like an umbrella by centrifugal force during rotation of the hub 5, and the static electricity charged on the hub 5 by lightly touching the inner diameter of the blind hole 12 is: It escapes to the support column 2 side via the fiber 17. All of the fibers 17 listed above have excellent heat resistance and abrasion resistance, have a melting point of 2300 ° C. or more, and are resistant to frictional heat generated by the tip of the fiber 17 being in contact with the inner diameter of the blind hole 12. Can withstand enough.

Further, in the air bearing shown in FIG.
FIG. 4 shows a fourth invention in which the conduction mechanism shown in the section is replaced with another embodiment. 4, the configurations of the air bearing and the spindle motor are the same as those in FIG.

In the fourth invention, the following conduction mechanism is provided in order to release the static electricity charged in the hub 5 to the fixing member. Counterbore 16 inside the center of rotation of hub 5
Is provided, and the sleeve 18 is fixed here. Sleeve 18
Then, a spindle 19 having a dynamic pressure groove 19a on the outer periphery and having a spherical contact at the tip is inserted into the stepped portion 21 provided at the tip of the column 2 guided by the guide. A stranded wire 20 made of a conductive fiber is extended from the bottom 12a of the blind hole 12 having the stepped portion 21, and the spindle 19 is moored. It is preferable that the fiber material of the stranded wire 20 made of a conductor is boron, carbon monofilament, tungsten, or the like.

With this configuration, the hub 5
Is discharged from the spindle 19 to the support 2 via the stranded wire 20 regardless of whether it is rotating or stopped. The outer diameter of the stopped spindle 19, which extends from the bottom 12a of the blind hole 12 and is moored by the stranded wire 20, is guided by one of the inner diameters of the sleeve 18, and the stranded wire 20 is loosened by its own weight. Since the hub 5 is seated on the attachment portion 21, static electricity charged on the hub 5 is discharged from the spindle 19 guided by the sleeve 18 to the stranded wire 2.
It is released to the support column 2 via the contact portion of the stepped portion 21 which is seated at 0 or seated.

When the hub 5 rotates at a high speed, the spindle 1
The sleeve 9 is moved from the seated position by the action of a dynamic pressure groove 19 a formed on the outer periphery of the spindle 19.
8 rises by S within the slack of the stranded wire 20 and comes into contact with the hub 5. At this time, the rotation torque of the spindle 19 is absorbed by the stranded wire 20. Then, the static electricity charged in the hub 5 intermittently comes into contact with the outer periphery of the spindle 19 guided by the sleeve 18, and is discharged to the column 2 via the stranded wire 20.

In the conduction mechanism according to the fourth aspect of the present invention, since the contact point at the tip of the spindle 19, which is a conductor, is located at the center of rotation of the hub 5, there is no risk of torque loss, wear and heat generation. At the time of assembly, if the gap between the outer diameter of the spindle 19 and the inner diameter of the stepped portion 21 is set to be larger than the gap between the inner ring 4 and the outer ring 6 of the radial air bearing, there is no danger of inducing misalignment between the rotating member and the fixed member. . Further, the floating of the hub 5 by the action of the dynamic pressure groove of the thrust air bearing is not prevented.

Although the first to fourth inventions have been described as being applied to the air bearing shown in FIG. 1 as a basic type, even if the thrust bearing is a magnetic bearing instead of an air bearing, the same effects can be obtained. It goes without saying that it plays.

[0043]

According to the first aspect of the present invention, a flexible curved tongue or ring made of a conductive material is provided at the center of rotation of the hub as a conduction mechanism for guiding static electricity charged on the hub serving as the rotating member to the fixed member. Abut. In the second invention, a pin with a head having a spherical contact is urged by an elastic body to abut on the center of rotation of the hub. In the third invention, the bundled fibers of the conductor are fixed inside the rotation center of the hub, and are housed in the blind holes of the fixing member. In the fourth invention, the sleeve is fixed inside the center of rotation of the hub, and the spindle is guided by the sleeve, reaches a stepped portion provided at the tip of the support column, and has a dynamic pressure groove on the outer circumference and a spherical contact at the tip. Then, the stranded wire made of the conductive fiber fixed to the bottom of the stepped portion is stretched to anchor the spindle.

According to these structures, the power consumption is suppressed without increasing the rotational torque due to the contact of the conductor, the wear of the contact points, the transfer of the wear portion due to the scattering of the wear powder, and the unnecessary frictional heat are reduced. Generation can be prevented. Further, the hub serving as the rotating member by contact with the conductor does not hinder the floating by the action of the dynamic pressure groove of the thrust air bearing. further,
There is no induction of misalignment due to the conductor when assembling the rotating member and the fixed member.

In the first and second aspects of the present invention, by selecting the mounting load of the elastic member and the coil spring, torque loss due to frictional resistance at the time of start-up can be achieved even when the thrust bearing is in contact during stoppage. Can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an air bearing having a conduction mechanism according to a first invention.

FIG. 2 is a sectional view of a conduction mechanism according to a second invention.

FIG. 3 is a sectional view of a conduction mechanism according to a third invention.

FIG. 4 is a sectional view of a conduction mechanism according to a fourth invention.

FIG. 5 is a cross-sectional view of a conventional conduction mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base plate 2 Prop 3 Disk 3a Spiral groove 4 Inner ring 5 Hub 6 Outer ring 7 Stator 8 Coil 9 Rotor magnet 10a Tongue piece 10b Ring 11 Rivet 12 Bore hole 13 Headed pin 14 Coil spring 15, 16 Counterbore hole 17 Fiber 18 Sleeve 19 Spindle 20 Twisted wire 21 Stepped part

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 11/00 H02K 11/00 Q (72) Inventor Kaoru Murabe 1-1-1, Kunyokita, Itami-shi, Hyogo Sumitomo F-term (reference) in Itami Works 3J011 AA20 BA02 BA08 CA02 EA10 5H607 AA04 BB01 BB09 BB14 BB17 CC01 DD01 DD02 DD03 DD08 DD14 FF12 GG01 GG02 GG09 GG12 GG14 5H611 AA03 BB01 BB08 PG08

Claims (8)

[Claims] 1. A conductor support is erected on a base plate,
Immediately above the base plate, a disk serving as a thrust air bearing having a spiral groove on the upper surface is provided, and an inner ring serving as a radial air bearing is fixed above the support, and inside a hub of a conductor serving as a rotation drive unit. In an air bearing in which an outer ring of a radial air bearing is fixed, one end of an elastic member made of a conductor is brought into contact with the center of rotation of a hub, and the other end of the elastic member is locked at the center of the upper portion of a column. An air bearing having a conduction mechanism. 2. The elastic member is a flexible curved tongue, one end of the tongue is in contact with the center of rotation of a hub, and the other end of the tongue is locked at the upper center of a column. An air bearing having the conduction mechanism according to claim 1. 3. The elastic member comprises a flexible ring,
The air bearing having a conduction mechanism according to claim 1, wherein one end of the ring is brought into contact with the center of rotation of the hub, and the other end of the ring is locked at the center of the upper part of the column. 4. A conductive column is erected on a base plate,
Immediately above the base plate, a disk serving as a thrust air bearing having a spiral groove on the upper surface is provided, and an inner ring serving as a radial air bearing is fixed above the support, and inside a hub of a conductor serving as a rotation drive unit. In an air bearing in which an outer ring of a radial air bearing is fixed, a headed pin having a spherical contact at a tip thereof can be moved in a blind hole provided at the tip of the column by following the behavior of a rotating hub. ,
An air bearing having a conduction mechanism, wherein the air bearing is inserted into the bottom of the blind hole at a predetermined interval and urged by an elastic body so that the tip of the headed pin contacts the center of rotation of the hub. 5. An air bearing having a conduction mechanism according to claim 4, wherein said elastic body is a coil spring made of a conductor. 6. A conductive column is erected on a base plate,
Immediately above the base plate, a disk serving as a thrust air bearing having a spiral groove on the upper surface is provided, and an inner ring serving as a radial air bearing is fixed above the support, and inside a hub of a conductor serving as a rotation drive unit. In an air bearing in which an outer ring of a radial air bearing is fixed, conductive fibers bundled and fixed inside the center of rotation of the hub follow the behavior of the rotating hub in blind holes provided at the tip of the column. An air bearing having a conduction mechanism, wherein the air bearing is housed at a predetermined distance from the bottom of the blind hole so as to be movable. 7. A conductive column is erected on a base plate,
Immediately above the base plate, a disk serving as a thrust air bearing having a spiral groove on the upper surface is provided, and an inner ring serving as a radial air bearing is fixed above the support, and inside a hub of a conductor serving as a rotation drive unit. In an air bearing in which the outer ring of a radial air bearing is fixed, a sleeve is fixed inside the center of rotation of the hub, the step is guided by the sleeve, reaches a stepped portion provided at the tip of the column, and has a dynamic pressure groove on the outer periphery. An air bearing having a conduction mechanism, wherein a spindle having a spherical contact at its tip is inserted and a stranded wire made of a conductive fiber fixed to the bottom of the stepped portion is stretched to anchor the spindle. . 8. The air bearing having a conduction mechanism according to claim 6, wherein the fibers of the conductor are boron, carbon monofilament, or tungsten.