CN1326824A - distortion correcting method and device for plane body - Google Patents
distortion correcting method and device for plane body Download PDFInfo
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- CN1326824A CN1326824A CN 01120816 CN01120816A CN1326824A CN 1326824 A CN1326824 A CN 1326824A CN 01120816 CN01120816 CN 01120816 CN 01120816 A CN01120816 A CN 01120816A CN 1326824 A CN1326824 A CN 1326824A
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Abstract
The present invention provides a method to efficiently manufacture a plane body of a high precision by efficiently straightening the plane body. By comparing a plane suitable for straightening (hereunder, expressed as straitening objective plane) a plane section 1a or an outer peripheral part 1b, etc., of a base plate 1 with a reference plane, a strain quantity at a prescribed position of the base plate is deduced. Based on the strain value, dies for straightening are constituted of straightening pins 7 for respective base plates. Against the die for straightening, the base plate 1 is pressed by the pressing pin 8 with prescribed force, required plastic deformation is generated to a required section of the straightening objective plane. Straightening is conducted to a whole of the straightening objective plane all at once, a straightening work is completed in a fixed time regardless of a difference in an area of a plane section, a straightening position, and a straightening quantity of respective works.
Description
The present invention relates to be used for effectively and operationally correct the method and the device of the distortion of plane body.
Fig. 5 illustrates the substrate 1 of a hard disk drive (HDD).When substrate 1 is when making with die casting mold, in the motlten metal cooling of aluminium, zinc or analog and the process of solidifying, may produce distortion in the substrate 1.In addition, before being assembled into each part in the substrate 1,, importantly, remove the distortion in the substrate 1 for the precision that improves subsequent job and the precision of finishing die product.Owing to this reason, the distortion on the planar section 1a of die casting mold substrate 1, the neighboring part 1b etc. is all corrected with plastic hammer is manual by the skilled worker, has high-precision substrate thereby provide.
But, the needs to HDD significantly increase now, and further require to supply HDD in more cheap mode, become satisfying the obstacle of these requirements thereby make to correct by hand to be out of shape.In addition, be difficult to guarantee the skilled worker.In this case, necessarily require effective answer to them.
The present invention makes in view of the above problems.One object of the present invention is for providing a kind of method and a kind of device, and they make it and might carry out the straightening operation in the planar section of plane body in high efficiency mode, thereby makes plane body with high accuracy.Plane body includes but not limited to the substrate of hard disk drive (HDD).
At the distortion correcting method that is used for plane body according to a first aspect of the present invention, the target surface that will correct and the predefined standard surface of workpiece are compared, deflection with the precalculated position on the target surface of determining to correct, form the most preferred mould that is exclusively used in each workpiece and can on the target surface that will correct, produces desired amount of plastic deformation successively in desired part, and workpiece is pressed on the mould, with simultaneously on the target surface that will correct integral body correct.
In the present invention,,, standard surface and target surface are compared mutually, on the precalculated position of workpiece, determine deflection, be formed for the rectification mould of each workpiece then according to the deflection on the precalculated position each workpiece in order to correct target surface.After, just workpiece is pressed in the rectification mould that is used for each workpiece with predetermined power, thus, just on the desired part of the target surface that will correct, produce desired amount of plastic deformation for each workpiece.And this rectification can be integrally and side by side is applied on the target surface that will correct, thereby can finish rectification work by preset time, and with the area of the target surface of each workpiece, correct position and correct amount difference irrelevant.
At the distortion correcting method that is used for plane body according to a second aspect of the present invention, mould is formed by this way, promptly can change the front position of a plurality of rectification pins that contact with the target surface that will correct of workpiece.
In the present invention, the rectification mould is configured to not adopt continuous surface, but adopts the rectification pin of desired point on a plurality of workpiece that can pressurize.Therefore, might easily change the shape of mould.
At the distortion correcting method that is used for plane body according to a third aspect of the present invention, a plurality of contact elements contact with the target surface that will correct, to obtain the contact point that a plurality of contact element is contacted, a plane is by three some regulations choosing arbitrarily from a plurality of contact points, and another point of each contact point just can be by cognition with the position relation on this plane, repeat said process, with deformation position and the deflection on the target surface that will correct of determining workpiece, and on deformation position and deflection, add magnitude of recruitment based on predetermined parameters, to determine to correct the position of pin.
In the present invention, will select in advance in a plurality of positions in order to the point of the flatness of the target surface that will correct of cognitive workpiece, and these points to be measured with contact element contacts and with it.From with the point of contact element contacts select any three points, thereby stipulate a plane.Then, by the position relation of cognitive another contact point with respect to this plane, with regard to cognizable at another contact point place the deflection with respect to this plane.By repeating this process, change selected point simultaneously, just can be accurately the deflection of cognitive reservations office on the target surface that will correct.After this, add that on deformation position and deflection the magnitude of recruitment based on predetermined parameters (for example considers the workpiece material characteristic, make it to change into from the elastic deformation area reliably the correct amount of plastically deforming area), correct pin with the location, and be configured to the rectification mould of each workpiece.
At the distortion correcting method that is used for plane body according to a fourth aspect of the present invention, said process can repeat repeatedly where necessary.Even can not obtain also will repeating correcting process under the situation of sufficient correct amount, do the element precision of desired rectification and raising workpiece by a correcting process.
At the distortion correcting method that is used for plane body according to a fifth aspect of the present invention, workpiece is a plane die-cast product.This plane die-cast product may produce distortion on its planar section in the process that motlten metal cools off and solidifies.But, the method has improved operating efficiency in the straightening operation that is used for this product.
At the distortion correcting method that is used for plane body according to a sixth aspect of the present invention, the plane die-cast product is used as the HDD substrate, and is being used for HDD substrate deformation rectification work, and operating efficiency is improved.
The deformation correcting device that is used for plane body according to a seventh aspect of the present invention comprises fixing point supporting arrangement, the transfer device that is used for workpiece, the measurement mechanism with a plurality of contact elements that is used for workpiece, apparatus for correcting and the calculation element with rectification pin and loaded pins, and be designed to carry out sequenced operation, wherein:
Be bearing in the target surface that to correct of the workpiece on the fixing point supporting arrangement with the measurement mechanism measurement;
Determine on the desired part of the target surface that will correct, to produce the optimum position and the optimum pressurized power of desired amount of plastic deformation according to measurement result;
Pin is corrected in the location, to provide plus-pressure in this position;
With transfer device workpiece is transferred on the apparatus for correcting from measurement mechanism;
With correcting pin and loaded pins clamping work pieces, so that the target surface that will correct is whole and corrected simultaneously.
According to the present invention, be contained in the target surface that to correct of the workpiece on the fixing point supporting arrangement that is used for workpiece with the measurement mechanism measurement, and this measurement always carries out on fixing position with respect to each workpiece, thereby measurement environment is stablized.Determine on the desired part of the target surface that will measure, to produce the optimum position and the optimum pressurized power of desired amount of plastic deformation according to measurement result, and pin is corrected in the location, to provide plus-pressure, so that be formed for the mould that is used to correct workpiece of each workpiece in this position.That is to say, form successively be exclusively used in each workpiece and corresponding to may be with workpiece the mould of different deflection.
Correct the mould structure and do not have continuous surface, but be designed to the needed part of pressurization on workpiece.Therefore, the shape of mould can easily be changed.Workpiece is transferred on the apparatus for correcting from measurement mechanism with transfer device, and workpiece is clamped with correcting pin and loaded pins, with whole on the target surface that will correct and correct simultaneously, can be according to each workpiece and variant thereby can carry out rectification work at short notice.
At the deformation correcting device that is used for plane body according to eighth aspect present invention, measurement mechanism makes a plurality of contact elements contact with the target surface that will correct, to obtain the contact point that contact element is contacted, calculation element uses from a plurality of contact points optional three points to stipulate a plane, the position on another and this plane in the cognitive contact point concerns, repeat these steps, with deformation position and the deflection on the target surface that will correct of determining workpiece, and on deformation position and deflection, add magnitude of recruitment based on predetermined parameters, to determine to correct the position of pin.
In the present invention, determine relevant point, and contact these contact points and measured with measurement mechanism in order to the flatness of the target surface that will correct of cognitive workpiece.In calculation element, from the point of contact element contacts select any three points, and stipulate a plane with this.Then, by the position relation of cognitive another contact point, with regard to the deflection of cognizable another contact point with respect to this plane with respect to this plane.By repeating this process, change selected point again simultaneously, with regard to deformation position and the deflection on the cognizable whole target surface that will correct.After this, (for example on deformation position and deflection, add based on the magnitude of recruitment of predetermined parameters, consider the workpiece material characteristic, make it to change into from the elastic deformation area reliably the correct amount of plastically deforming area), correct pin with the location, and be configured to the mould that is used to correct workpiece of each workpiece.
At the deformation correcting device that is used for plane body according to a ninth aspect of the present invention, above-mentioned sequenced process can repeat where necessary.Even, do desired rectification, to improve the element precision of workpiece not obtaining also will repeating correcting process under the situation of sufficient correct amount by a correcting process.
At the deformation correcting device that is used for plane body according to a tenth aspect of the present invention, workpiece is a plane die-cast product.May produce on its planar section in the straightening operation of the plane die-cast product that is out of shape in the process that motlten metal cools off and solidifies, operating efficiency is improved.
At the deformation correcting device that is used for plane body according to a eleventh aspect of the present invention, the plane die-cast product is a HDD substrate.Be used for HDD substrate deformation rectification work, operating efficiency is improved.
In the accompanying drawings:
Fig. 1 is a schematic diagram, and it shows the deformation correcting device that is used for plane body according to one embodiment of the present of invention;
Fig. 2 is a schematic diagram, and it illustrates the major part of the straightening equipment that is used for plane body shown in Figure 1;
Fig. 3 (a) is a key diagram to 3 (e), and they illustrate adopts the correcting device that is used for plane body shown in Figure 1 to correct the order of the distortion on the substrate;
Fig. 4 (a) is a key diagram to 4 (b), and they show the order of determining position L shown in Figure 3; And
Fig. 5 is a perspective view, and it illustrates a HDD substrate basically.
A preferred embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 schematically shows the deformation correcting device that is used for plane body according to embodiments of the invention.As in Fig. 2 by shown in the mode of amplifying, as its major part, this deformation correcting device 2 comprises that transfer device 4, that a fixing point supporting arrangement 3, that is used for substrate 1 is used for substrate 1 has the measurement mechanism 6 of a plurality of contact elements 5, has an apparatus for correcting 9 and a calculation element (not shown) of correcting pin 7 and loaded pins 8.This device further comprises a unshowned operation panel.
The fixing point supporting arrangement 3 that is used for substrate 1 for example adopts a plate jig, to be located at clamping device on the platen of deformation correcting device 2 etc., and the fixing point of supporting arrangement supporting substrates 1 is constant so that keep the posture of substrate 1.Under the situation that fixing point supporting arrangement 3 is made of plate jig, transfer device 4 comprises plate jig,, and is made of moving substrates 1 such as this arm and transporter, together with plate jig with the part as conveying arrangement an arm a, transporter etc.Under the situation that fixing point supporting arrangement 3 is made of the clamping device on the platen, adopt arm etc., this arm is sent into substrate 1 in the clamping device that is arranged on measurement mechanism 6 and the apparatus for correcting 9.
A plurality of rectification pins 7 of apparatus for correcting 9 are arranged to and can be contacted with a certain position, and this preliminary site selection becomes to be suitable for and can correct distortion from the target surface that will correct of substrate 1.Apparatus for correcting 9 is provided with drive unit, power-actuated actuator etc. for example, and it can realize accurate localization.Front position by pin 7 is corrected towards the direction change of the target surface that will correct of substrate 1 in the edge just can produce desired amount of plastic deformation on the desired part of the target surface that will correct.That is to say that pin 7 is as mould.
The loaded pins 8 of apparatus for correcting 9 is positioned to face rectification pin 7 separately, accompanies substrate 1 betwixt.One drive unit is set, and it can control plus-pressure exactly when substrate 1 is clamped at loaded pins 8 and corrects between the pin 7, and hydraulic cylinder, power-actuated actuator etc. all is suitable for use as drive unit.
In addition, unshowned calculation element is identified for producing in desired position the optimum position and the optimum pressurized power of desired amount of plastic deformation on the target surface that will correct according to the measurement result that is obtained by measurement mechanism 6, and send a location to the drive unit of correcting pin 7 and correct the instruction of selling, so that on this position, exert pressure.Equally, loaded pins 8 is also sent an instruction that applies predetermined pressure.
With reference now to Fig. 3 and 4, order with the distortion on the target surface that will correct of deformation correcting device 2 rectification substrates 1 is described.
At first, shown in Fig. 3 (a), a plurality of contact elements 5 are contacted, with the target surface that will correct (planar section 1a or neighboring part 1b) of the substrate 1 of a supporting arrangement 3 supportings that are fixed so that obtain contact element 5 each position for the some contact.Then, with transfer device substrate 1 is transferred on the apparatus for correcting 9 from measurement mechanism 6.In this moves, measurement result according to measurement mechanism 6, calculation element is determined optimum position L that each corrects pin 7 and the optimum pressurized power that will be applied by loaded pins 8, so that produce desired amount of plastic deformation on the desired part of the target surface that will correct.
Be used for determining that from the measurement result of measurement mechanism 6 order of position L is as follows: shown in Fig. 4 (a), measurement mechanism 6 at first selects to be used for the some A to F of the flatness of the target surface that cognition will correct, and by making contact element 5 be in contact with it the position of measuring these points.After, with regard to available from the contact point of contact element plane of optional three somes regulation.
For example, by some A, B and the F regulation planar S of measurement point, and the some C on the cognitive neighboring part 1b is with respect to the position relation of planar S.There is distortion, a C is offset under the situation of a C ' shown in Fig. 4 (b), point C ' just can obtain owing to the comparative result between the some C of measurement point C ' and standard surface with respect to the deflection of a C, and this standard surface is the planar section of the benchmark workpiece of measurement in advance.After this, with regard to the deflection of cognizable some C ' with respect to planar S.By repeating this process, change selected point simultaneously, just can accurately determine deformation position and deflection on the whole target surface that will correct.
In addition, (for example on the deformation position of the target surface that will correct and deflection, add based on the magnitude of recruitment of predetermined parameters, consider the material behavior of substrate, make it to change into from the elastic deformation area reliably the correct amount of plastically deforming area), thus obtain being used on the target surface that will correct, applying the optimum position of the rectification pin 7 of desired correct amount.In addition, the number of the point of measuring with contact element 5 changes according to the area of planar section 1a that becomes the target surface that will correct and neighboring part 1b, shape etc.
Shown in Fig. 3 (b), the front position of correcting pin 7 is positioned on the position L that is determined by calculation element.Locate on L by the front position that so will correct pin 7, just can be configured for correcting the mould of substrate 1 each workpiece.
Then, shown in Fig. 3 (c), action loaded pins 8 rises substrate 1, corrects between pin 7 and the loaded pins 8 so that substrate 1 is clamped at.And then shown in Fig. 3 (d), the pressure of control loaded pins 8, so that on substrate 1, apply with plus-pressure needed, that determine by calculation element, thereby on the target surface that will correct, produce such distortion, change the plastically deforming area into from the elastic deformation area reliably with activation.Like this, the target surface that correct just can wholely also side by side be corrected.
The distortion of the target surface of correcting is corrected by said sequence, thereby can obtain having the substrate 1 of high flatness shown in Fig. 3 (e).If can not obtain sufficient correct amount with a correcting process, then the process of Fig. 3 (a) to 3 (d) will repeat twice or more times on demand, to improve the element precision of workpiece.
The effect and the effect that are obtained by the embodiments of the invention that as above constitute can be summarized as follows: in the present embodiment, in order to correct the distortion of substrate 1, all standard surface and the target surface that will correct are compared to each other for each substrate, determine the deflection of substrate on the precalculated position, be formed for the rectification pin of each substrate then according to the deflection on the precalculated position with rectification pin 7.After this, on the rectification mould, press substrates 1 with predetermined power, thereby can on the desired part of the target surface that will correct, produce desired amount of plastic deformation each substrate with loaded pins 8.Therefore, can obtain having high-precision substrate.
In addition, become on the planar section of the target surface that will correct 1a or the neighboring part 1b owing to correct wholely also side by side to be applied to, so rectification work can finish in the constant time, and no matter the area of the planar section that can become with each workpiece, how correct position and correct amount.Therefore, according to the distortion correcting method and the device of embodiments of the invention, might make expeditiously and have high-precision substrate 1.
Above-mentioned rectification mould is to constitute by the front position that changes a plurality of rectification pins 7, and this rectification pin will contact with the surface that will correct of substrate 1.Have discontinuous surface still has the rectification pin of a plurality of desired points that can pressurize on the target surface that will correct rectification mould by formation, can easily change the shape of mould.Therefore, might easily constitute a special-purpose mould that is suitable for each substrate, this substrate needs different separately correct amounts in different separately rectification positions.
In addition, when constitute correcting mould, from contact point that contact element 5 contact select three points arbitrarily, to stipulate planar S, and be recycled and reused for cognitive another position relation, so that deformation position and deflection on the target surface of determining exactly to correct with respect to planar S.After this, on deformation position and deflection, add magnitude of recruitment, correct pin 7 with the location based on predetermined parameters.This just makes it to be configured for exactly the rectification mould of each substrate 1.
Even can not obtain sufficient correct amount, also to repeat twice or more times from the process of Fig. 3 (a) to 3 (d), thereby make substrate 1 be subjected to desired rectification by a correcting process.
In an embodiment of the present invention, the apparatus for correcting 9 of deformation correcting device 2 will so design, so that correct the top that pin 7 is arranged in substrate 1, loaded pins 8 then is arranged in the below of substrate 1.But, also can adopt opposite layout.In addition, it is not necessary vertically clamping substrates with rectification pin 7 and loaded pins 8.(see figure 5) under the situation that the rigid balancing of substrate 1 is mainly served as by neighboring part 1b, the rectification of substrate 1 can by and in the rectification pin 7 of many contact elements 5 that measurement mechanism 6 is set on the position of the outer peripheral portion 1b of substrate 1 and apparatus for correcting 9 and loaded pins 8 and more effectively carry out.In addition, the target workpiece that correct is not limited to substrate 1, and can be can eliminate any plane body that the material of distortion is done with plastic deformation with those, and it can obtain effect same as described above and effect.
The present invention who so consists of has following effect:
The distortion correcting method that is used for plane body according to a first aspect of the present invention might have Effect ground carries out the straightening operation of plane body, and does not rely on skilled worker's handwork. Therefore, might provide in the mode of cheapness the plane body product that has in a large number high flatness.
According to the distortion correcting method that is used for plane body of a second aspect of the present invention, can be easy Ground consists of the mould that is suitable for each plane body, effectively to carry out the straightening operation of plane body. In addition, according to the distortion correcting method that is used for plane body of a third aspect of the present invention, can carry The high precision that is used for the mould of each plane body, thus can carry out with high accuracy the change of plane body The shape rectification work.
According to the distortion correcting method that is used for plane body of a fourth aspect of the present invention, even pass through A correcting process can not obtain sufficient correct amount, also can repeatedly repeat on demand correcting process, Thereby improve the flatness of plane body and improve element precision.
According to the distortion correcting method that is used for plane body of a fifth aspect of the present invention, might Increase work efficiency in the straightening operation of plane die-cast product, thus can be in the mode of cheapness The die-cast product that has in a large number high flatness is provided. According to being used for of a sixth aspect of the present invention The distortion correcting method of plane body might provide in the mode of cheapness to have in a large number high plane The HDD substrate of degree.
The deformation correcting device that is used for plane body according to a seventh aspect of the present invention might have Effect ground carries out the straightening operation of plane body and does not rely on skilled worker's handwork. Therefore, The plane body product that has in a large number high flatness might be provided from the mode of cheapness.
The deformation correcting device that is used for plane body according to a eighth aspect of the present invention might have Effect ground carries out the straightening operation of plane body with high accuracy, thereby production has high-precision effectively The plane body of degree.
According to the deformation correcting device that is used for plane body of a ninth aspect of the present invention, even can not Obtain sufficient correct amount by a correcting process, but can repeatedly repeat on demand to correct Process, thus improve the flatness of plane body and make the plane body with high element precision.
According to the deformation correcting device that is used for plane body of a tenth aspect of the present invention, might Increase work efficiency in the straightening operation of plane die-cast product, thereby carry in the mode of cheapness For a large amount of plane die-cast products with high flatness. According to a eleventh aspect of the present invention Straightening equipment, can have mode with cheapness that a large amount of high flatnesses that have are provided The HDD substrate.
Claims (11)
1. be used for the distortion correcting method of plane body, it comprises the following steps:
The target surface that will correct and the predefined standard surface of workpiece are compared, with the deflection in the precalculated position on the target surface of determining to correct;
According to form the mould that is exclusively used in each workpiece and can on the target surface that will correct, produces desired amount of plastic deformation at the deflection on the precalculated position in desired part;
Under predetermined pressure, workpiece is pressed on the mould, integrally on the target surface that will correct, to correct simultaneously.
2. the distortion correcting method that is used for plane body as claimed in claim 1 is characterized by, and constitutes mould by the front position that changes a plurality of rectification pins that contact with the target surface that will correct of workpiece.
3. the distortion correcting method that is used for plane body as claimed in claim 2, it comprises the following steps:
A plurality of contact elements are contacted, to obtain the contact point that a plurality of contact elements contact with it with the target surface that will correct;
Stipulate a plane by from a plurality of contact points, selecting three points arbitrarily;
The position relation on cognitive another contact point and this plane;
Repeat these steps, with deformation position and the deflection on the target surface that will correct of determining workpiece;
On deformation position and deflection, add magnitude of recruitment, to determine to correct the position of pin based on predetermined parameters.
4. as each the distortion correcting method that is used for plane body of claim 1 to 3, it is characterized by, above-mentioned steps can repeat repeatedly on demand.
5. as each the distortion correcting method that is used for plane body of claim 1 to 4, it is characterized by, workpiece is a plane die-cast product.
6. the distortion correcting method that is used for plane body as claimed in claim 5 is characterized by, and the plane die-cast product is a HDD substrate.
7. the deformation correcting device that is used for plane body, it comprises fixing point supporting arrangement, the transfer device that is used for workpiece, the measurement mechanism with a plurality of contact elements that is used for workpiece, apparatus for correcting and the calculation element with rectification pin and loaded pins, and carry out sequenced operation, wherein:
Be bearing in the target surface that to correct of the workpiece on the fixing point supporting arrangement with the measurement mechanism measurement;
Determine on the desired part of the target surface that will correct, to produce the optimum position and the optimum pressure of desired amount of plastic deformation according to measurement result;
Pin is corrected in the location, to apply plus-pressure in this position;
With transfer device workpiece is moved to apparatus for correcting from measurement mechanism;
With correcting pin and loaded pins clamping work pieces, so that the target surface that will correct is whole and corrected simultaneously.
8. the deformation correcting device that is used for plane body as claimed in claim 7, it is characterized by, measurement mechanism makes a plurality of contact elements contact with the target surface that will correct, to obtain the contact point that a plurality of contact elements are in contact with it, calculation element uses from a plurality of contact points optional three points to stipulate a plane, the position relation on cognitive another contact point and this plane, repeat these steps, with deformation position and the deflection on the target surface of determining to correct, on deformation position and deflection, add magnitude of recruitment, to determine to correct the position of pin based on predetermined parameters.
9. as the deformation correcting device that is used for plane body of claim 7 or 8, it is characterized by, sequential process can repeat on demand.
10. as each the deformation correcting device that is used for plane body of claim 7 to 9, it is characterized by, workpiece is a plane die-cast product.
11. the deformation correcting device that is used for plane body as claim 10 is characterized by, the plane die-cast product is a HDD substrate.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP158444/2000 | 2000-05-29 | ||
| JP2000158444 | 2000-05-29 | ||
| JP315016/2000 | 2000-10-16 | ||
| JP2000315016A JP2002059216A (en) | 2000-05-29 | 2000-10-16 | Method and apparatus for straightening plane body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1326824A true CN1326824A (en) | 2001-12-19 |
| CN1246099C CN1246099C (en) | 2006-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01120816 Expired - Fee Related CN1246099C (en) | 2000-05-29 | 2001-05-29 | Distortion correcting method and device for plane body |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2002059216A (en) |
| CN (1) | CN1246099C (en) |
| MY (1) | MY128593A (en) |
| SG (1) | SG90774A1 (en) |
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|---|---|---|---|---|
| JP2553316B2 (en) * | 1993-03-02 | 1996-11-13 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Data storage disk drive device |
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2000
- 2000-10-16 JP JP2000315016A patent/JP2002059216A/en active Pending
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2001
- 2001-05-11 SG SG200102789A patent/SG90774A1/en unknown
- 2001-05-15 MY MYPI20012281 patent/MY128593A/en unknown
- 2001-05-29 CN CN 01120816 patent/CN1246099C/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2002059216A (en) | 2002-02-26 |
| MY128593A (en) | 2007-02-28 |
| CN1246099C (en) | 2006-03-22 |
| SG90774A1 (en) | 2002-08-20 |
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