CN1351748A - Method and apparatus for balancing a spindle in a hard disk drive - Google Patents
Method and apparatus for balancing a spindle in a hard disk drive Download PDFInfo
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- CN1351748A CN1351748A CN 00807980 CN00807980A CN1351748A CN 1351748 A CN1351748 A CN 1351748A CN 00807980 CN00807980 CN 00807980 CN 00807980 A CN00807980 A CN 00807980A CN 1351748 A CN1351748 A CN 1351748A
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- disk
- signal
- reference field
- balance
- analysis instrument
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
- G11B5/59627—Aligning for runout, eccentricity or offset compensation
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- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
- Rotational Drive Of Disk (AREA)
Abstract
An apparatus for balancing and centering a disk comprising a sensor that produces a signal indicative of the disk's deviation from a desired dimension and a movable reference surface that moves the disk in response to the signal from the sensor. The apparatus may include a microprocessor connected to a balance analyzer. Feedback from the balance analyzer can be used to compensate for setup errors, thermal drift, and tool wear.
Description
Related application
The application requires the temporary patent application No.60/131 of proposition on April 29th, 1999,554 right of priority.
Technical field
The present invention relates to a kind of basic method and apparatus that is used on the balancing shaft for circular dish.More particularly, the present invention relates to a kind of hard disk drive of balance computer employed on axle one or more magnetic recording disk and the method and apparatus of spaced ring.
Background technology
Folded formula disk pack unit (disk stack assembly) is the critical piece of many computer hard disc drivers (DSA).One DSA generally includes a plurality of magnetic recording disk and spaced rings that alternately are installed on the axle.One driving motor can make DSA center on turning axle high speed rotating (revolution or " RPM " with per minute represents usually) usually.If the center of gravity of DSA not on its turning axle, then can cause a kind of unbalanced state.This state will produce vibration and the noise that the people is accepted, and they can make the bearing premature failure of motor, and reduce user's satisfaction.
A kind of method that partly solves imbalance problem comprises the use counterbalance weight.These counterbalance weights can increase or reduce the weight of DSA at key position, to correct unbalanced state.The problem that this method produces is that counterbalance weight can occupy the packaged inner space of driver.Because the size of driver is made every effort to not increase by the manufacturer of disc driver when increasing the data storage capacity of disk, so this problem is considerable always.So, need a kind of balance method that need not to disperse counterbalance weight, make the deviser more effectively use operational encapsulation volume by this.
Another problem that produces with counterbalance weight balance DSA is that this method needs complicated and tediously long installation process.The application of counterbalance weight needs manufacturer usually: (1) is as far as possible accurately with mechanical stopping piece centering ring and disk; (2) with spaced ring and disc clamp on axle; (3) any unbalanced state is tested; (4) increase necessary counterbalance weight; And (5) test DSA once more, with the check driver whether within its regulation.Therefore, the method that needs a kind of faster, simpler balance DSA.
Another kind of partly solution is to manage to make the external diameter of DSA (OD) to become the cylindrical shape concentric with turning axle.For each disk and spaced ring, this method is used the retainer of two rigidity and the retainer of an elastic load usually.Rigid stop member position each other is roughly 120 degree, and carries out mechanical positioning with the size of nominal OD.The problem that this method produces is could turn round well when all disks among the DSA have identical OD.Another problem that this method produces is the scope that the dimensional tolerence of disk OD is allowed greater than the balancing technique standard usually.As a result, the tolerance of OD has hindered accurately to neutral equilibrium.When the driver industry increased its running speed, it is more sharp-pointed that this problem will become.
Obviously, need a kind of cheapness, general in the neutral equilibrium device, this device can be eliminated the impropriety of some existing systems, produces accurate result, and has the lower turnaround time (" TAT ").
Summary of the invention
The present invention relates to a kind of method and apparatus that is used for the folded formula disk pack unit of balance disc driver, this method and apparatus compensates near the unbalance mass, that is positioned at the turning axle with the offset some small amount of magnetic recording disk.The fact that these embodiment utilized is to compare with the internal diameter (" ID ") of disk, more close its external diameter in the position of most of disk quality (" OD "), also utilized any specific unbalance mass, all with the direct proportional material facts of radial distance of it and turning axle.
Therefore, one embodiment of the invention comprise that one produces the sensor of signal, the deviation of at least one disk of this signal indication and ideal dimensions, and this embodiment also comprises a portable reference field, this movable type reference field moves at least one disk in response to the signal that sensor produces.This embodiment can comprise a microprocessor that links to each other with equilibrium analysis instrument, sensor and portable reference field.The feedback of equilibrium analysis instrument becomes error when can be used for the spaced ring of centering not or other directional error, unbalanced driving motor and wearing and tearing or other and compensates.
Some embodiments of the present invention can be used for balance and fold a plurality of disks and the spaced ring that assembles in the formula disk pack unit.This embodiment folds the formula disk pack unit to the major general and is divided into two groups.This embodiment moves the disk in every group according to the deviation of disk and ideal or nominal size.This embodiment can be used for obtaining single face (" static state ") balance or two-sided (" coupling " or " dynamically ") balance.
Another embodiment of the present invention comprises a pressing piece, and this pressing piece is suitable at least one the disk application of force in a plurality of disks, makes it to be resisted against the disk reference field; One is used to produce the sensor of signal, the deviation of each disk of this signal indication and ideal dimensions; And positioning piece, this keeper moves the disk reference field in response to the signal that sensor produces, by this folded formula disk pack unit of balance.
Another aspect of the present invention is the method for the disk on a kind of balancing shaft.One embodiment of this method comprises: produce a kind of signal, and the deviation of this signal indication disk and ideal dimensions, and in response to described signal, disk is moved.This method also can comprise a portable reference field is set, and to the disk application of force, make it to be resisted against portable reference field.
Another aspect of the present invention is the method that the external diameter of a kind of balance and disk member changes irrelevant folded formula disk pack unit.One embodiment of this method comprises a plurality of portable reference fields is set, to a plurality of disk application of forces, make it to be resisted against a plurality of portable reference fields, produce a kind of signal of representing the deviation of a plurality of disks and nominal size, and, a plurality of disks are moved in response to described signal.
Two additional aspect of the present invention are the method for the disk on one of the centering and folded formula disk pack unit with at least one uneven place.The embodiment of the method for centering disk comprises a portable reference field is set, and to the disk application of force, makes it to be resisted against portable reference field, produces a kind of signal of representing the deviation of disk and ideal dimensions, and in response to described signal, disk is moved.The embodiment of folded formula disk pack unit comprises axle and is rotatably connected in the skew disk of axle.Skew disk in the present embodiment can compensate at least one uneven place.
Another aspect of the present invention is the method for the disk on one of the centering, an one embodiment comprises a portable reference field is set, to the disk application of force, make it to be resisted against portable reference field, produce a kind of signal of representing the deviation of disk and ideal dimensions, and, disk is moved in response to described signal.
One of the features and advantages of the present invention are that mobile magnetic recording disk comes balance DSA, no longer need the position of design and installation counterbalance weight, can save the volume space of the internal drive of encapsulation.Another feature of the present invention is to compensate directional error and wearing and tearing.This feature will increase the degree of accuracy of equilibrium process.In conjunction with following instructions, claims and accompanying drawing, these and other feature, aspect and advantage of the present invention will be understood better.
Description of drawings
Fig. 1 is the vertical view that the present invention is used for an embodiment of disk centering;
Fig. 2 A is the vertical view that has the embodiment among Fig. 1 of nominal disk;
Fig. 2 B is the vertical view that has the embodiment among Fig. 1 of actual disk;
Fig. 3 A is the vertical view that the present invention is used for an embodiment of the folded formula disk pack unit of balance;
Fig. 3 B is the side view of the embodiment among Fig. 3 A, shows a plurality of planar pressing spares;
Fig. 3 C is the front view of the embodiment among Fig. 3 A.
Embodiment
Fig. 1 shows the embodiment of the device 10 that is used for balance rotating axle 13 one or more disk 12 on every side.Each disk 12 has roughly cylindrical circular inside surface 14, and this inside surface forms a central opening 15; Two surfaces that roughly are the plane, each surface (at least partially) forms a magnetic recording face 16; An and roughly cylindrical circular outer rim 20.Outer rim 20 forms a girth with external diameter (OD), and this external diameter is different from (for example nominal) value of required or appointment.Device 10 comprises two portable cylindrical reference fields 24 and 26 and one portable pressing piece 28, and each in them all invests slidingtype base 30,32 and 34 respectively admittedly.Device 10 also comprises a position transducer 36, and this position transducer comprises that a sensing element 38, one mounting brackets 40 are attached to slidingtype base 34 with described sensor.One electric connector 42 makes position transducer 36 link to each other with microprocessor 41.
Measuring and during positioning disk 12, portable reference field 24 and 26 and pressing piece 28 disk is fixed. Reference field 24 and 26 should be made by the relatively large material of hardness, and this material has mar proof, corrosion resistivity and lower thermal expansivity preferably. Suitable reference field 24 and 26 example are cylinders of being made by nickel-plated steel.Since it can be during clamping with disk with spaced ring is fixing goes up in position, so this embodiment is comparatively desirable.That is to say that when through the axle collar, a threaded axle collar or other suitable method of preheating disk and spaced ring being clamped in the wheel hub of motor with one, these disks and spaced ring can move axially slightly.So, because columniform reference field 24 and 26 and the pressing piece 28 on plane allow disks and spaced ring to move axially, and can not change their center, therefore described reference field and pressing piece are comparatively desirable.Yet, make or reference field 24 and 26 with other shape and direction all is within the scope of the present invention by other material.
Referring to Fig. 2 A-2B, will set forth the method for using embodiments of the invention the OD of disk 12 to be centered in the turning axle 13 of DSA below.It is R that Fig. 2 A shows radius
0The nominal disk, turning axles 13 are aimed at its OD center 52.When pressing piece 28 was pushed into reference field 24 and 26 with nominal disk 12, position transducer 36 can be measured the distance X between the outer rim 20 (or back side 40 of pressing piece 28) of sensing element 38 and disk 12
0Fig. 2 B shows the disk 12 that radius is R, and this radius is slightly larger than desirable radius R
0When pressing piece 28 is pushed into reference field 24 and 26 with disk 12, a segment distance " d " will be moved from turning axle 13 in its actual OD center 50.Displacement in the present embodiment " d " can use formula d=2 * s/3 to calculate, and " s " wherein is the actual disk measured of position transducer 36 and the variable in distance between the nominal disk.Yet, when post 24 and 26 and the interval of pressing piece 28 be not 120 when spending, should use other formula.Two reference fields 24 and 26 and the face 38 thereby can move along " X " axle of exerting pressure are so that eliminate displacement " d ".That is to say, can be positioned at along on the position of turning axle 13 until its actual OD center 50 by mobile disk 12.
At present, some hard disks are designed to: be provided with some disks in the folded formula disk pack unit, and separate with spaced ring.Folded formula disk collectively carries out balance and centering.Can adopt several method to realize this process.A kind of suitable method is to use the described process of Fig. 2 A-2B that each disk is positioned in the folded formula disk.Because it is will move each disk respectively, so this method is very effective, but comparatively complicated and time-consuming.Second method is the displacement d according to average computation, and all disks 12 in the folded formula disk are moved.When the axial height of disk groups during less than disk radius (i.e. " depth-width ratio is lower "), this method will form single face (or " static state ") balance, and become a kind of solution of reality.The third method will be used in the bigger disk groups of depth-width ratio (group that for example has four or more disks 12) shown in Fig. 3 A-3C.In this method, suitably locate many group magnetic recording disks along the total length of turning axle, carry out the process of balance and centering.This inertia (quality) axle in position fixing process and rotating shaft parallel and consistent, it is called as coupling (or " dynamically ") balance.
Fig. 3 A-3C is used for balance to have two or the bowing of the embodiment of the DSA of a plurality of independent disks 12, side and front view.Device 10 comprises a sensing element 38 and an associating pressing piece 28 that is used for each disk 12.Disk 12 is divided into " top group " 60 and " bottom group " 62.Each group 60 and 62 self reference field 24 and 26 is attached to the slidingtype base 30 and 32 of himself.As mentioned above, second method is used to each group 60 and 62 of balance, makes them obtain the coupling balance.Abundant balance at motor and/or spaced ring self obtains under the situation of desirable balance whole DSA, move retainer along directions X, making the disk 12 in each group is the center with turning axle 13, and the amount of movement of described retainer is the average displacement amount d of the disk 12 in this group.
Each group 60 and 62 among this embodiment has the disk 12 of equal number, or Duos a disk to adapt to the situation with various number disks than another group.The displacement of each group 60 and 62 calculates all disks 12 that comprise in this group.Although present embodiment uses two groups of disks, yet skilled person in the art will be recognized: will fold the group that the formula disk is divided into any amount and all be within the scope of the present invention.A large amount of groups can produce more accurate result, but needs extra hardware and complexity is increased.Skilled person in the art will recognize that also this method can be used for the disk groups that balance comprises any amount of disk 12.
The present invention also can carry out the skew of right quantity from turning axle 13 by making magnetic recording disk 12, comes compensating for periodic imbalance (for example out-of-alignment spaced ring).Because the weight of spaced ring only be about 1/10th of hard disk weight, therefore can be with the method that the is offset disk 12 balance spaced ring of centering not easily.That is to say,, spaced ring is not carried out accurately centering with regard to not needing if a certain member is identical with the anglec of rotation with the residing distance of the spaced ring in the adjacent members.Spaced ring with respect to this constant of turning axle but recursive misaligning can compensate by making hard disk make a constant but less deviation at 180 degree at imbalance place.Therefore, embodiment at first will use an equilibrium analysis device (not shown) to measure unbalanced angle and quantity, for example Bowenet al. (" Bowen ") is at the U.S. Patent application 09/505 of proposition on February 16th, 2000, that is disclosed in 033 is such, will be in conjunction with it in full as a reference at this.So device 10 will use collected information of equilibrium analysis instrument and well-known mathematical formulae to calculate suitable disk side-play amount, and in view of the above disk will be offset.For example, at 93 degree places the disk of 50gm is carried out the degree of unbalancedness of rectifiable 273 0.5gm-mm of degree place of skew of 0.01mm.See Fig. 2 A-2B, as discussed previously, another embodiment will adopt the OD that measures spaced ring in a like fashion.So can calculate the mean radius d of spaced ring.Take into account the d of spaced ring and their associating quality, and disk and/or ring are offset.
In the application that some is had relatively high expectations, the unbalancedness of motor also may become important, a recurrent factor of the overall unbalancedness of driver.As tackling the not spaced ring of centering, the present invention can carry out the skew of right quantity to disk 12 at the 180 degree places at imbalance place, remedies the unbalancedness (amplitude and angle) of known motor.In one embodiment, use a standard equilibrium analysis instrument, such as a pair of calibrating signal transducer that can detect the vibration that is produced when motor moves, or, measure the amplitude and the angle of motor unbalancedness with respect to permanently being positioned at a raadable mark (" Index mark ") on the axle at the equilibrium analysis instrument described in the patent of aforementioned " Bowen ".In assembling process (usually before disk and ring are installed), this equilibrium analysis instrument can be placed on any local easily.The data that the equilibrium analysis instrument is obtained offer microprocessor 41, and use well-known mathematical formulae to calculate the side-play amount of disk.
Provide the company of motor to use the equilibrium analysis instrument to obtain the balancing technique condition of its motor itself usually.Therefore, if electric motor manufacturer provides the equilibrium criterion of each motor, just can exempt the expense that motor equilibrium analysis instrument is installed on the DSA assembly line.Therefore, an embodiment with a kind of machine formula readable tag (for example bar code) so that each special motors is associated with its corresponding unbalanced data.Owing to exempted the equilibrium process in the DSA assembly line, so this embodiment is comparatively desirable.
When also can remedying, the present invention becomes error, for example wearing and tearing and thermal drift.The data that one embodiment obtains the equilibrium analysis instrument are recorded in the computer-readable medium, come to the time become and to detect.Then, this embodiment compares the average displacement amount of some disk groups of making recently and the average displacement amount of some previous disk groups of making.Yet other embodiment can use more complicated statistical technique the variation of data is discerned and to be quantized.Discerned in case change, microprocessor 41 can calculate suitable disk skew, and described skew will remedy variation.Change parts and/or recalibrate " stop time " that device 10 is produced owing to can reduce, so this feature is comparatively desirable, can make manufacture process more simple and reliable.
The invention provides the many known disk balance and advantages of centralising device of surpassing.For example, the device 10 that is disclosed can be measured the OD size of each independent disk 12 in the disk groups before centering.This method can obtain the four corner of the OD size in the disk groups, can also obtain the balance of height.In addition, because magnetic recording disk is used as counterbalance weight, so the present invention no longer needs to add the instrument of (or shifting out) counterbalance weight.This advantage has reduced fund, labour cost and TAT.In addition, the centralising device that is disclosed only needs the feedback of the single poising tool in the assembly line.Thereby no longer need second equilibristat and can save extra fund cost, labour and productive capacity.
Although the present invention has carried out detailed narration in conjunction with its specific embodiment, still have some modification.For example, although the embodiment shown in Fig. 1-3 is that skilled person in the art should be realized that: the described principle of this announcement can be applied to along many arbitrary axis mobile disks 12 along " X " direction mobile disk 12. Reference field 24 and 26 also can other angle be staggered, and also can increase auxiliary reference field.In addition, the present invention can be applicable to multiple in the neutral equilibrium process except that hard disc of computer.
Therefore, skilled person in the art should be realized that: embodiments of the invention, feature and member thereof are described and illustrated to drawing and description.Be used for fastening, installation, attached or be connected to form the relevant apparatus of the member of the present invention of overall setup, unless clear and definite description is arranged, otherwise these devices will comprise traditional securing member, for example machine screw, nuts and bolt web member, machine threaded connector, split ring, screw clamp, rivet, nuts and bolt, toggle, pin and similar device.If suitable, the method connecting elements of also available welding, soft soldering, hard solder, friction force assembling, bonding or distortion.Unless clear and definite announcement or indication are arranged, otherwise the material of making member of the present invention can select from suitable material, for example metal, metal alloy, fiber, condensate and similar material; And can use suitable manufacturing or production method, comprise casting, extruding, mold pressing and machining.In addition, for the ease of narration, can be as a reference with front view and rear view, right view and left view, top and bottom perspective views and top view and backplan, and be not limited to any position of the present invention or its member or the view of direction in space.Therefore, need carry out in all directions consideration to embodiment described here, rather than restriction, also need to determine scope of the present invention with reference to appended claim.
Claims (24)
1. one kind is used for device of going up at least one disk of balance, and it comprises:
One sensor, described sensor links to each other with at least one described disk, produces a kind of signal, the deviation of described signal indication and ideal dimensions; And
One portable reference field, described reference field moves at least one described disk in response to the described signal that described sensor produces.
2. device as claimed in claim 1 also comprises:
Pressing piece, described pressing piece makes it to be resisted against described portable reference field at least one described disk application of force.
3. device as claimed in claim 1, it also comprises a plurality of described disks that are arranged in the folded formula disk pack unit.
4. device as claimed in claim 3 is characterized in that,
Described folded formula disk pack unit is divided at least two groups; And
Described portable reference field is according to the mean deviation of ideal dimensions each group at least two groups being moved.
5. device as claimed in claim 3 is characterized in that, described portable reference field moves a plurality of described disks, to obtain single plane balancing.
6. device as claimed in claim 3 is characterized in that, described portable reference field moves a plurality of described disks, to obtain the coupling balance.
7. device as claimed in claim 1 also comprises:
One microprocessor, described microprocessor links to each other with described portable reference field with described sensor.
8. device as claimed in claim 7 also comprises:
One equilibrium analysis instrument, described equilibrium analysis instrument links to each other with described microprocessor, is used to produce the unbalanced signal of a kind of expression.
9. device as claimed in claim 8 is characterized in that, the circulating imbalance of signal indication that described equilibrium analysis instrument produces.
10. device as claimed in claim 8 is characterized in that, the unbalanced spaced ring of signal indication that described equilibrium analysis instrument produces.
11. device as claimed in claim 8 is characterized in that, the unbalanced motor of signal indication that described equilibrium analysis instrument produces.
12. device as claimed in claim 8 is characterized in that, the signal indication device that described equilibrium analysis instrument produces has error.
13. device as claimed in claim 8 is characterized in that, the signal list that described equilibrium analysis instrument produces is shown with wearing and tearing.
14. device as claimed in claim 8 is characterized in that, the signal list that described equilibrium analysis instrument produces is shown with thermal drift.
15. device as claimed in claim 8 is characterized in that, described microprocessor uses and derives from the signal that the equilibrium analysis instrument produces and calculate the disk side-play amount, and described side-play amount is arranged on a plurality of described disk in the described folded formula disk pack unit with mobile equilibrium.
16. device as claimed in claim 1 is characterized in that, at least one described disk comprises an outside surface, and described outside surface forms an external diameter, and ideal dimensions is described external diameter.
17. the balance device of a folded formula disk pack unit, it comprises:
One pressing piece, described pressing piece are suitable at least one the disk application of force in a plurality of disks, make it to be resisted against a disk reference field;
One is used to produce the sensor of signal, the deviation of each disk of described signal indication and ideal dimensions;
Positioning piece, described keeper moves the disk reference field in response to the signal that described sensor produces, by this folded formula disk pack unit of balance.
18. the method for the disk on one of the balance, it comprises:
Produce a kind of signal, the deviation of described signal indication disk and ideal dimensions; And
In response to described signal, disk is moved.
19. method as claimed in claim 18, it also comprises:
One portable reference field is set; And
To the described disk application of force, make it to be resisted against described portable reference field.
20. method as claimed in claim 18 is characterized in that, described disk comprises an outside surface, and described outside surface forms an external diameter, and ideal dimensions is described external diameter.
21. the method for the folded formula disk pack unit of balance, the external diameter of described method and disk member changes irrelevant, and this method comprises:
A plurality of portable reference fields are set;
To a plurality of disk application of forces, make it to be resisted against a plurality of described portable reference fields;
Produce a kind of signal, the mean deviation of a plurality of disks of described signal indication and nominal size; And
In response to described signal, a plurality of disks are moved.
22. method as claimed in claim 21, it also comprises:
A plurality of described disks are divided into two groups at least;
Produce a kind of signal, first group mean deviation in described signal indication at least two groups; And
Signal in response to representing first group mean deviation moves first group.
23. the method for the disk on one of the centering, it comprises:
One portable reference field is set;
To the disk application of force, make it to be resisted against portable reference field;
Produce a kind of signal, the deviation of described signal indication disk and ideal dimensions; And
In response to described signal, disk is moved.
24. one has the folded formula disk pack unit at least one uneven place, it comprises:
One; And
One skew disk, described disk are rotatably connected in described axle, with the skew disk at least one uneven place are compensated by this.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13155499P | 1999-04-29 | 1999-04-29 | |
| US60/131,554 | 1999-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1351748A true CN1351748A (en) | 2002-05-29 |
Family
ID=22449957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00807980 Pending CN1351748A (en) | 1999-04-29 | 2000-04-28 | Method and apparatus for balancing a spindle in a hard disk drive |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2002543549A (en) |
| CN (1) | CN1351748A (en) |
| AU (1) | AU4680700A (en) |
| WO (1) | WO2000067253A1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100500235B1 (en) | 2002-12-24 | 2005-07-11 | 삼성전자주식회사 | Disc centering device |
| KR100983992B1 (en) * | 2009-02-25 | 2010-09-28 | 에버테크노 주식회사 | Disk Centering Apparatus |
| US9779780B2 (en) | 2010-06-17 | 2017-10-03 | Teradyne, Inc. | Damping vibrations within storage device testing systems |
| US8687349B2 (en) | 2010-07-21 | 2014-04-01 | Teradyne, Inc. | Bulk transfer of storage devices using manual loading |
| US9001456B2 (en) | 2010-08-31 | 2015-04-07 | Teradyne, Inc. | Engaging test slots |
| US9459312B2 (en) | 2013-04-10 | 2016-10-04 | Teradyne, Inc. | Electronic assembly test system |
| CN105699670A (en) * | 2014-11-27 | 2016-06-22 | 广明光电股份有限公司 | Drive apparatus of biological detection disc |
| US10845410B2 (en) | 2017-08-28 | 2020-11-24 | Teradyne, Inc. | Automated test system having orthogonal robots |
| US10948534B2 (en) | 2017-08-28 | 2021-03-16 | Teradyne, Inc. | Automated test system employing robotics |
| US11226390B2 (en) | 2017-08-28 | 2022-01-18 | Teradyne, Inc. | Calibration process for an automated test system |
| US10725091B2 (en) | 2017-08-28 | 2020-07-28 | Teradyne, Inc. | Automated test system having multiple stages |
| US10983145B2 (en) | 2018-04-24 | 2021-04-20 | Teradyne, Inc. | System for testing devices inside of carriers |
| US10775408B2 (en) | 2018-08-20 | 2020-09-15 | Teradyne, Inc. | System for testing devices inside of carriers |
| US11899042B2 (en) | 2020-10-22 | 2024-02-13 | Teradyne, Inc. | Automated test system |
| US11754596B2 (en) | 2020-10-22 | 2023-09-12 | Teradyne, Inc. | Test site configuration in an automated test system |
| US11953519B2 (en) | 2020-10-22 | 2024-04-09 | Teradyne, Inc. | Modular automated test system |
| US11754622B2 (en) | 2020-10-22 | 2023-09-12 | Teradyne, Inc. | Thermal control system for an automated test system |
| US11867749B2 (en) | 2020-10-22 | 2024-01-09 | Teradyne, Inc. | Vision system for an automated test system |
| US12007411B2 (en) | 2021-06-22 | 2024-06-11 | Teradyne, Inc. | Test socket having an automated lid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0211964B1 (en) * | 1985-07-22 | 1989-01-18 | Carl Schenck Ag | Process and device for determining the angle between the position of an unbalance and a reference position |
| JP2532471Y2 (en) * | 1990-07-05 | 1997-04-16 | 株式会社豊田自動織機製作所 | Rotation detection mechanism in oscillating swash plate compressor |
-
2000
- 2000-04-28 WO PCT/US2000/011614 patent/WO2000067253A1/en active Application Filing
- 2000-04-28 JP JP2000616015A patent/JP2002543549A/en active Pending
- 2000-04-28 AU AU46807/00A patent/AU4680700A/en not_active Abandoned
- 2000-04-28 CN CN 00807980 patent/CN1351748A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002543549A (en) | 2002-12-17 |
| AU4680700A (en) | 2000-11-17 |
| WO2000067253A1 (en) | 2000-11-09 |
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