CN1133164C

CN1133164C - Counter balance disc spacer for hard disc drives

Info

Publication number: CN1133164C
Application number: CN998160857A
Authority: CN
Inventors: N·吉伊拉皮帕纳库; M·J·C·托; B·W·奎克; C·S·洛
Original assignee: Seagate Technology LLC
Current assignee: Seagate Technology LLC
Priority date: 1999-02-09
Filing date: 1999-07-02
Publication date: 2003-12-31
Anticipated expiration: 2019-07-02
Also published as: JP2002536780A; GB0119189D0; GB2364165B; GB2364165A; DE19983924T1; CN1342311A; KR20010102020A; WO2000048181A1; KR100433708B1

Abstract

An information handling system, such as a disc drive (100), including a base (112), a disc stack rotatably attached to the base, and an actuator assembly movably attached to the base. The disc stack assembly (200) includes a spindle hub (133) rotatably coupled to the disc drive. The disc stack assembly also includes a clamp, a disc spacer (210), and a disc coupled to a spindle hub. The disc spacer is asymmetrical and positioned to counter balance a mass offset in the disc stack assembly. The asymmetrical disc spacer also includes a registration surface (212).

Description

The disc spacer that contends with that is used for hard disk drive

Technical field

The present invention relates to relate to the field of high capacity storage device.Particularly, the present invention relates to the disk packs assembly of gimbal around a disk spindle line that rotates.

Background technology

A place that critical component is a storage data of any computer system.Computing machine has many different, places that can storage data.A common place of the storage mass data in the computer system is a disc driver.The basic part of disc driver is a rotating disk, makes sensor move to an actuator of the diverse location on the disk, and is used for disk is write circuit with sense data.Disc driver also comprises the circuit to the data coding, thereby can successfully read and write magnetic disk surface.The operation of the major part of one system controlled by computer disc driver, and allow data return required computing machine and in required computing machine, take out data to be stored in the disk.

The information storage of expression data is on the surface of memory disk.The information that disk drive system will be stored in the memory disk magnetic track is read or writing information.Be fixed on the slide block and the sensor that is positioned at the both sides of memory disk is read on memory disk and writing information when it accurately is located on one of the track of the lip-deep appointment of memory disk with the W head form.Sensor also moves to target track.When memory disk rotates and W head when accurately being positioned on the target track, W head can store the data on the track by the mode that the information that will represent data writes memory disk.Same, sense data can realize by the data that W head are positioned on the target track, read storage from memory disk from the memory disk.In order to write or sense data on different tracks, the W head critical path is to moving across track, so that arrive selected target track.Data are disperseed or are gathered in orbit.In some disc drivers, track is many concentric circular tracks.In other disc driver, a continuous helix is a track in a disc driver one side.Servo feedback information is used to make sensor accurately to locate.Actuator moves to the position that needs, and read or the write operation process in utilize servo-information very accurately to keep locating.

Sensor is placed in the slide block usually.And slide block is a little ceramic block, and it becomes sensing relation ground to pass through on disk with disk.Little ceramic block also is called slide block, and it generally according to the aerodynamic principle design, therefore can fly on disk.Most of slide blocks have air-supported surface (ABS), and it comprises track and the hole between track.When disk rotated, air was pulled between track, and magnetic disk surface produces pressure, and this power forces magnetic head to leave disk.Meanwhile, produce a negative pressure region through the air of the depression in the air-supported surface rapidly.This negative pressure or suction are offset the pressure that produces at interorbital.Slide block also is fixed on the loading spring, and it produces the power towards magnetic disk surface on slide block.The mutual balance of various power, thus slide block is flown on magnetic disk surface on desirable especially flying height.Flying height is the thickness of air lubrication film or the distance between magnetic disk surface and the transducing head.This film prevents friction and consequent wearing and tearing, if this wearing and tearing will take place when transducing head and disk Mechanical Contact in the disk rotation process.In some disc driver, slide block passes through one deck lubricant, rather than flies at magnetic disk surface.

When disk was worked, disk rotated with quite high rotations per minute (RPM) usually.At present, common rotating speed is 7200RPM.The rotating speed of high-performance magnetism disk drive is up to 10,000RPM.High rotational speed is a developing direction.This high rotating speed allows the short access time.In other words, disk rotates soon, and the performance of disc driver just obtains improving, and this is because the needed time of information of the specific part on the access drive has shortened.The short access time is the deviser and the constant target of fabricator of disc driver.

High rotational speed also makes disc driver vibrate because of unbalanced rotational parts.As a result, assembling process comprises also that usually the part to rotating carries out balance in disc driver.Main rotational parts in disc driver is the disk packs assembly.The disk packs assembly is one or several disks that are fastened on the spindle hub.Utilize disc spacer and disk folder that disk is fixed in spindle hub.One spindle drive motor is used to rotating spindle hub and disk packs assembly.

It is highly important that because uneven condition will cause occurring many problems in the disc driver, so should have the disk packs of a balance.A problem relevant with uneven disk packs is that it can vibrate and produce noise.A unbalanced disk packs also makes at the rotating part of spindle hub and the bearing between the main shaft and is in stress.Stressed bearing has the short life-span, and it may be less than the guideline lives of disc driver.Unbalanced disk packs also produces unsettled velocity variations between the track of sensing head and disk.This velocity variations may cause read/write errors.The plane of magnetic disk surface and axial vibration also may cause head crash.

In addition, the plane vibration or the vibration of propagating in the plane on data in magnetic disk surface make the track of the sensing head difficulty that becomes.In other words, when disk packs when in-plane vibrates, tracked track will laterally pass through the tracking direction of sensing head.This problem will enlarge owing to track is very close to one another.In the disc driver of today, the track density of 10,000 tracks of per inch is common.Article six, track is equivalent to a hair.As time goes on, people will need higher track density, and this problem only can be more serious.In other words, the performance of disc driver will by make track more crypto set improve.A disk has high more density, and the storable data of representative information are just many more.In addition, if mode of vibration has a frequency, and this frequency is higher than the frequency of the servo sector that is read out, and magnetic head may be across the track several times between servo sector.

Imagination previous, that solve uneven disk packs problem comprises disk and spindle hub design and manufactures close tolerance, so that obtain closely cooperating between the external diameter of the internal diameter of disk and spindle hub, thereby the pivot center that makes the relative disk pack unit of rotating mass is at the center.This will cause non-equilibrium state, because the impossible disk that obtains perfectly cooperation and same balance.In order to obtain preferable balance, once used gimbal.Gimbal is increased or reduce material by complicated accurate equipment to obtain balance preferably, but it is to be assembled into cost with the rapid disk packs of multistep more.

The United States Patent (USP) of authorizing Van Der Giessen has been introduced the precision machined inwall and a centering device of disk center pit for the 4th, 358, No. 803, and this element cooperates with at least one inwall and makes disk at the center.In No. the 4th, 224,648, the United States Patent (USP) of authorizing Roling, centering centers by the steel in disk packs that ball carries out, and this ball that centers has towards the semispherical surface of a main shaft cup.Relatively the disk inwall center do not guarantee the most relatively disk of disk rotating mass at the center, and the rotating mass of disk is almost completely outside the inwall of disk.The external diameter of disk may be not concentricity well with the internal diameter of disk.Like this, relatively the disk internal diameter center need be before disk be fixed on spindle hub high-precision alignment disk, and ignore some unbalanced main cause.

Disk is centered and fasteningly also causes particulate to produce with the said method that forms a disk packs, and this will reduce the performance of disc driver, even may produce head crash.United States Patent (USP) the 4th, 358, is designed to slidably such as steel ball and main shaft cup in No. the 4th, 224,648, the inwall of the processing of disk center pit and centering device and the United States Patent (USP) at the matching surface in No. 803, and withstanding pressure simultaneously is until cooperating.This slip produces does not wish the particulate that occurs.

The United States Patent (USP) of authorizing people such as Schmidt discloses the another kind of disk packs assemble method that uses in the disc driver for the 4th, 683, No. 505.At United States Patent (USP) the 4th, 683, in No. 505, disk packs have around a main shaft pivot center, alternately, along all disks of diametric(al) skew.These disks are located with the variation of their outer ledge, and like this, the queuing of that replace, opposite outer ledge is outer ledges at the nominal diameter disk at center as them.This causes the increase of the axial node quantity of potential unbalanced moments, and reduces the amplitude of relevant vibration.Disc spacer also be around main-shaft axis alternately along diametric(al) skew, like this, paired identical parts trends towards mutual balance, thus with the possible vibration degree that minimizes.The problem of this scheme is that this disk packs needs the disk of even number.In addition, this scheme can not be worked in the disk packs that has only a disk, because there is not another disk unique disk that contends with.The work period that many other schemes need be grown, this is disadvantageous for manufacturing.

Therefore, need the method and apparatus that a kind of balance has only the disk packs of single disk.Also need a kind of method that can assemble easily and make.Need a kind of method that can not produce particulate again.

Summary of the invention

A kind of information handling system, such as a disc driver, it comprises that a base, is installed in rotation on disk packs and on the base and is installed in rotation on actuator on the base.The disk packs assembly comprises that one is rotatably connected to the spindle hub on the disc driver.Spindle hub has a pivot center, and the disk packs assembly rotates around it.Spindle hub comprises a column part.The disk packs assembly also comprises a clip, a disc spacer and is connected a disk on the spindle hub.Disc spacer has a hole, the column part of its size receivability spindle hub.Disc spacer is asymmetric, and is installed into the mass shift that can compensate in the disk packs assembly.Asymmetric disc spacer also comprises a locating surface.This locating surface is on the periphery of disc spacer.Disc spacer has the mass centre of the longitudinal center line that departs from the hole.Disc spacer is used to offset the mass shift center of disk packs assembly.Usually, the balance of disk packs assembly is needed the side of the mass centre of partition at the pivot center of spindle hub, and the mass centre of disk packs assembly is at the opposite side of the pivot center of spindle hub.The plane surface of asymmetric half disk (AHD) partition is such location, the plane of this plane surface with by the longitudinal center line of disk packs assembly and any Plane intersects of forming relevant with the mass shift of disk pack unit.Preferably, asymmetric disc spacer can be used to the disk packs that balance has only a disk.In addition, the asymmetric half disk (AHD) partition also can be used to the disk packs that balance has many disks.This method is easy to use.It is assembling and manufacturing easily.This method also produces the particulate of minimum level, because form in the locating surface process at balancing processing with in flat side, the disk folder is not processed.It is a kind of simple but valid approach so that the instrument that allows to carry out the disc spacer skew meshes, makes partition alignment automatically on required orientation simultaneously on this surface that flat side provides.The asymmetric half disk (AHD) partition also makes material consumption reduce to minimum level, and this will reduce cost of parts.

Description of drawings

Fig. 1 has many disk packs and is used for from the parts explosion of magnetic disk surface unload sensor with a disc driver of the ramp assembly that parks this sensor;

Fig. 2 is the side view of a spindle hub, and it has many fixing disks and many disc spacers, and they form a disk packs assembly;

Fig. 3 is the side view of a spindle hub, and it has a single fixing disk and a disc spacer, and they form a disk packs assembly;

Fig. 4 is the stereographic map of disc spacer ring;

Fig. 5 is the vertical view of asymmetric partition ring;

Fig. 6 is along the cut-open view that analyse and observe, asymmetric partition ring of the 6-6 line among Fig. 5;

Fig. 7 is the stereographic map that has a spindle hub of fixing disk, and they form a disk packs assembly;

Fig. 8 is the process flow diagram that carries out the method for disk packs balance;

Fig. 9 is the synoptic diagram of a computer system.

Embodiment

In the preferred embodiment that is described in detail below, label is presented in the accompanying drawing as a part of the present invention, and accompanying drawing utilizes the enforceable specific embodiment of the present invention to show.Should be understood that the embodiment that under the situation that does not exceed the scope of the invention, also can use other and can carry out structural change.

The invention that the application describes can be used in the mechanical realization of all disc drivers with rotation or linear actuating.In addition, the present invention also can be used for all types of disc drivers, comprises hard disk drive, the driver of floppy disk and any other type, wherein, requires to go up unload sensor and park this sensor from a surface.Fig. 1 is a kind of parts explosion with disc driver 100 of a rotational actuator.Disc driver 100 comprises a housing or base 112, and a lid 114.Base 112 and lid 114 form a jacket.Be rotatably mounted on the actuator shaft 118 of base 112 is actuator 120.Actuator 120 comprises a comb shape structure 122, and it has many arms 123.Be fixed on all arms that separates 123 of comb shape structure 122 is all load beam or all loading springs 124.Load beam or loading spring also are called cantilever.What be fixed on each loading spring 124 end is slide block 126, and it carries a Magnetic Sensor 150.Slide block 126 with sensor 150 is called magnetic head many time.Should be understood that many slide blocks have a sensor 150, promptly as shown in the figure.It will also be appreciated that the present invention equally also can be used for having a slide block with upper sensor, they are called MR or magnetoresistive head, and one of them sensor 150 is commonly used to read, and another is commonly used to write.At actuator arm assembly 120 relative loading springs 124 and slide block 126 opposite sides are voice coil loudspeaker voice coils 128.

Be fixed in the base 112 is pair of magnet 130.This is critical parts of voice coil motor to magnet 130 and voice coil loudspeaker voice coil 128, and it provides power for actuator 120, so that it is rotated around actuator shaft 118.Be installed in the spindle drive motor that also has on the base 112.Spindle drive motor comprises the rotating part that is called spindle hub 133.In this concrete disc driver, spindle drive motor is in spindle hub.In Fig. 1, many disks 134 are fixed on the spindle hub 133.In other disc driver, the disk of individual disk or varying number can be fixed on the spindle hub.The disc driver that the present invention described here can be used for having the disc driver of many disks equally and has individual disk.

Fig. 2 is the side view of spindle hub 133, and it has many fixing disks 134 and many disc spacers 210, and they form disk packs assembly 200.Disk packs assembly 200 also comprises disk folder 220, and it is fixed on disk 134 and partition 210 on the spindle hub 133.Spindle hub 133 comprises a mounting flange 233.At first partition 210 is placed on the mounting flange 233.Then disk 134 is placed on the spindle hub 133.Be positioned over spindle hub 133 in case will select the disk 134 and the partition 210 of quantity, utilize the disk folder that disk and disc spacer are applied an axial load, and be fixed on the spindle hub 133.In this specific embodiment, disk folder 220 is spiral disk folders.As shown in Figure 2, disc spacer 210 comprises a plane surface 212.Plane surface 212 in manufacture process as a tool positioned surface or be used for the instrument of balance disk packs assembly 200.Plane surface 212 also makes partition ring 210 asymmetric in appearance.As shown in Figure 2, partition ring 210 can be used for comprising many disks disk packs assembly 200.

Fig. 3 is the side view of a spindle hub 133, and it has single disk 134 and the single disc spacer 210 that is fixed on the spindle hub 133.Disk packs assembly 200 shown in Figure 3 has shown that partition 210 can be used for having the disc driver of single disk 134.Disk 134 can be placed on the spindle hub 133 and abut against the mounting flange 233 of spindle hub 133.Then, be placed on partition 210 on the disk 134 and around spindle hub 133.Then, utilize disk folder 220 that disk 134 and disc spacer 210 are clamped on the spindle hub, thereby disc spacer 210 and spindle hub 133 are applied an axial force.Use asymmetric partition 210 to be very beneficial for to comprising that single disk, as shown in Figure 3 the disk packs of disk packs carry out balance.

Fig. 4 is the stereographic map with disc spacer ring 210 of plane surface 212.Disc spacer 210 comprises an annulus main body 400 and an antelabium 402.Annulus main body 400 comprises an internal diameter 410 and an external diameter 412.Annulus main body 400 also has a longitudinal center line 420.Plane surface 212 is that the part by the antelabium 402 of partition 210 forms.Preferably, plane surface is extensible and form a plane on the external diameter 412 of annulus main body 400.The position of plane surface 212 can require the longitudinal center line skew of mass centre or the relative disk of center of gravity how far to change according to the deviser.Side-play amount will depend on the part that uses in the design of disc driver and the disk packs assembly 200.

Referring now to Fig. 5 and 6,, they have shown the biasing between the longitudinal center line of center of gravity or mass centre and disc spacer 210.Fig. 5 is the vertical view of asymmetric partition ring 210.Fig. 6 is the cut-open view along the 6-6 line among Fig. 5.The center of gravity of disc spacer ring 210 or mass centre represent with label 500.Can see that center of gravity or mass centre 500 depart from the longitudinal center line 420 of disc spacer 210, the center of gravity 500 that makes disc spacer 210 is along leaving the direction of plane surface 212 from longitudinal center line 420 asymmetric skews.Like this, the asymmetric skew that also provides mass centre or center of gravity to leave the longitudinal center line of disc spacer 210 of this physics.This can be called and has produced a mass shift direction, or makes quality leave the longitudinal center line skew of disc spacer 210.The direction of mass shift is left the planar section 212 of disc spacer 210.

Fig. 7 has shown the stereographic map of the spindle hub 133 that has fixing disk 134, and they form disk packs assembly 200.For the sake of clarity, the part of disk 134 is cut, thereby can be clear that mounting flange 233, spindle hub 133, disc spacer 210 and disk folder 220.Spindle assemblies 200 also has a longitudinal center line 720.Usually, longitudinal center line 720 is corresponding to the pivot center of spindle hub 133 or whole magnetic disk pile component 200.

Fig. 7 has also shown first offset direction 700 and second offset direction 710.First offset direction 700 is relevant with the quantity that the longitudinal center line 420 on the disc spacer is left at the center 500 of gravity.In other words, first offset direction 700 is directions that center of gravity 500 has been offset disc spacer 210.Second offset direction 710 is center of gravity skews from the axial centre of disk packs 200, it is to be caused by the intrinsic imbalance of the part that forms disk packs 200, and second offset direction also can be considered to the imbalance of disk 134, spindle hub 133 and disk folder 220.Imbalance during these part assemblings makes the center of gravity of disk packs assembly 200 be offset to second offset direction 710 from longitudinal center line 720.

From Fig. 7, can see 710 facedowns, first offset direction 700, second offset direction.From another angle, the imbalance of disk packs assembly 200 is by the imbalance compensation of disc spacer 210.In the disc driver that uses a disc spacer, imbalance will be compensated by the mass shift center on 210 li on single partition ring.Provide the another kind of mode of this compensation to be, mass unbalance or from be used to contend with the similar skew of the center of gravity of center line 420 skew 200 li of disk packs assemblies.As shown in Figure 7, the mass shift that disc spacer 210 contends with 200 li of disk packs assemblies is set.

If the formation of plane surface 210 makes this plane surface comprise the internal diameter of disc spacer or the tangent line of external diameter, will form some interesting relations, it may be useful in the equilibrium process that this pass ties up to.In case the mass shift of spindle assemblies is determined, can form the plane of the center of gravity of the center line 720 that comprises disk packs assembly 200 and disk packs assembly.Disc spacer 210 is moved to the position of the mass centre of disk pack unit and the mass shift center in the disc spacer ring contending with, will cause plane surface 212 and the Plane intersects that forms by the longitudinal center line 720 of disk packs assembly 200 and the point relevant with the mass shift of disk packs assembly 200.If plane surface comprises and the internal diameter of disc spacer ring 212 or the tangent line of external diameter, plane surface will be in fact perpendicular to by the central axis of disk packs assembly 200 with comprise the plane that the point of the mass shift of disk packs assembly forms.

Fig. 8 is a process flow diagram of making the method for disk packs assembly 200 and balance disk packs assembly 200.During operation, the machine that is used for assembling disk packs is at first with partition 210, be placed on disk 134 on the spindle hub 133 then, and represents with

label

800 and 810 respectively.Utilize automation to be placed on the orientation very, represent with label 820 near the disc spacer 210 of its final orientation.Disk 200 is placed on the top of partition 210 by automation.One biasing apparatus that is installed on the automation biases to first direction with the plane surface of disc spacer 210, represents with label 830.This biasing apparatus disk 134 of also setovering is in the opposite direction represented with label 840.Because biasing apparatus promotes the plane surface of disc spacer 210, disc spacer 210 aligns with optimal orientation automatically.This will setover partition 210 and disk 134.Disk folder 220 is installed then, is represented with label 850.After being clamped in disk 134 and partition 210 on the spindle hub 133, carry out balance check, represent with label 860.

More convenient is that available asymmetric disc spacer comes balance only to have the disk packs of a disk.In addition, asymmetric disc spacer can also be used to the disk packs that balance has many disks.This method is easy to use.It makes assembling and manufacture process become easy.This method also produces the particulate of minimum level, because processing of disk folder and plane surface are not formed a locating surface in equilibrium process.Plane surface provides a simple but valid approach promptly to allow to make instrument and this surface engaged of disc spacer biasing, and partition is automatically alignd with desirable orientation.The asymmetric half disk (AHD) partition also drops to minimum level with the consumption of material, and this will reduce cost of parts.

Fig. 9 is the synoptic diagram of a computer system.Preferably, the present invention is applicable to computer system 1000.Computer system 1000 also can be called electronic system or information handling system, and it comprises a center processor, a storer and a system bus.Information handling system comprise a center processor 1004, a random access memory 1032 with one with center processor 1004 system bus 1030 that 1032 communications are connected with random access memory.Information handling system 1002 comprises a magnetic disk drive apparatus, and it comprises ramp recited above (ramp).Information handling system 1002 also can comprise an input/output bus 1010, and plurality of peripheral equipment, can be fixed on the input/output bus 1010 such as 1012,1014,1016,1018,1020 and 1022.Peripherals can comprise hard disk drive, MO drive (Magneto Optical drive), floppy disk, watch-dog, keyboard and other peripherals.The disc driver of any kind can use has surface-treated slide block discussed above.

Should be understood that above-mentioned introduction is just in order to illustrate rather than to retrain.For those skilled in the art, many other embodiment can also be arranged after having studied above-mentioned introduction.Therefore, the four corner of the equivalent that should be mentioned by appended claims and claims of scope of the present invention limits.

Claims

1. disk packs assembly that is used for disc driver, described disk packs assembly rotates in disc driver, and described disk packs assembly comprises:

Spindle hub, it is rotatably connected on the disc driver, so that an axis is provided, allows the disk packs assembly rotate around this axis, and described hub comprises a column part;

One clip;

One asymmetric disc spacer, it has a hole, the column part of its size receivability spindle hub, described hole has a longitudinal center line, the asymmetric shape of disc spacer produces the mass centre of disc spacer and the skew of longitudinal center line, asymmetric shape is a plane surface, and this plane surface comprises a string of the periphery of disc spacer; And

One is connected the disk on the hub, and the mass shift of shifting balance in the disk packs assembly that described disc spacer makes the mass centre of disc spacer is installed.

2. the disk packs assembly that is used for disc driver as claimed in claim 1 is characterized in that described asymmetric half disk (AHD) partition comprises a locating surface.

3. the disk packs assembly that is used for disc driver as claimed in claim 1, it is characterized in that, disk packs has a longitudinal center line, the described plane surface of described asymmetric half disk (AHD) partition is configured to and a Plane intersects, and described plane comprises the mass shift of the longitudinal center line and the disk packs of disk packs assembly.

4. the disk packs assembly that is used for disc driver as claimed in claim 1, it is characterized in that, disk packs has a disk packs longitudinal center line, the described plane surface of described asymmetric half disk (AHD) partition is vertical with a plane, and described plane comprises the disk packs longitudinal center line of disk packs assembly and the mass shift of disk.

5. the disk packs assembly that is used for disc driver as claimed in claim 1 is characterized in that, the asymmetric half disk (AHD) partition is configured to the mass shift of contending with disk.

6. disc driver as claimed in claim 1 is characterized in that, the mass centre of partition is in a side of the pivot center of hub, and the mass centre of the other parts of disk packs assembly is at the opposite side of the pivot center of hub.

7. disc driver as claimed in claim 2 is characterized in that, locating surface is used to make disc spacer location, makes the contend with mass centre's skew of other parts of disk packs assembly of the mass centre of disc spacer.

8. disc driver as claimed in claim 7 is characterized in that, also comprises many disc spacers.

9. disc driver as claimed in claim 8 is characterized in that, also comprises many disks.