US20010029806A1 - Vibration-reducing device for high-speed rotational body - Google Patents
Vibration-reducing device for high-speed rotational body Download PDFInfo
- Publication number
- US20010029806A1 US20010029806A1 US09/285,840 US28584099A US2001029806A1 US 20010029806 A1 US20010029806 A1 US 20010029806A1 US 28584099 A US28584099 A US 28584099A US 2001029806 A1 US2001029806 A1 US 2001029806A1
- Authority
- US
- United States
- Prior art keywords
- vibration
- reading device
- hanging means
- weight body
- reducing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002184 metal Substances 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 description 7
- 239000007769 metal material Substances 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 6
- 238000013016 damping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
- G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
- G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
- G11B33/08—Insulation or absorption of undesired vibrations or sounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2121—Flywheel, motion smoothing-type
- Y10T74/2131—Damping by absorbing vibration force [via rubber, elastomeric material, etc.]
Definitions
- the present invention relates to a vibration-reducing device for high-speed rotational body, more particularly, to a vibration-reducing device, by which the data reading/writing device such as CDROM has less vibration and better data accessing stability.
- the conventional vibration-reducing device generally uses elastomer such as rubber or silicon rubber as hanging means between a weight body and the reading device to be suppressed vibration.
- the hanging means made of such elastomer has large variation in characteristics due to the difficulty in controlling the hardness and elastic constant (Young's modulus) of the elastomer materials. Therefore, the vibration-reducing effect is degraded and fail to meet the specifically-designed requirement.
- the mechanical properties of the elastomer, such as elastic constant, hardness and damping ratio are highly thermal dependent. The designed parameters of the hanging means even has great variation over an ordinary environment (5° C. ⁇ u60° C.), thus degrades the vibration-reducing effect.
- the mechanical properties of metal materials have a great similarity over the different batches of product such that metal materials are advantageous to use as hanging means between the weight body and the reading device.
- the mechanical properties of metal materials are less thermal sensitive in ordinary environment (5° C. ⁇ 60° C.), thus provides enhanced stability.
- FIG. 1 shows the model of spring-mass system for the present invention
- FIG. 2 shows the relationship between vibrational displacement and the angular speed of the optical disk to be accessed
- FIG. 3 is the perspective view of the invention
- FIG. 4 is the perspective view of the first embodiment of hanging means in the present invention.
- FIG. 5 is the perspective view of the second embodiment of hanging means in the present invention.
- FIG. 6 is the perspective view of the third embodiment of hanging means in the present invention.
- FIG. 7 is the perspective view of the fourth embodiment of hanging means in the present invention.
- FIG. 1 the principle of the vibration-reducing device of the present invention can be explained with reference a model of spring-mass system, wherein A denotes the housing of the reading device, m1 the reading device, m2 the weight body, k 1 , C 1 the elastic constant and damping constant of the hanging means between the reading device and the housing, k 2 , C 2 the elastic constant and damping constant of the hanging means between the reading device and the weight body.
- F 0 the centrifugal force of the reading device and ⁇ the angular speed of the disk.
- the high-speed CDROM is generally designed to operate in constant angular speed and k 2 /m 2 is designed to be square of the angular speed, i.e.
- the vibration of the reading device caused by the acentric disk will transfer to the weight body (m2) at the designed angular speed.
- the vibration of the reading device will be reduced by the transferring action.
- the vibration X 1 is very sensitive to ⁇ / ⁇ 22 . The vibration-reducing effect will be degraded and the vibration is seriously increased, even w slightly deviates from ⁇ 22 .
- the present invention uses the fact that metal materials have stable thermal properties to keep k 2 at constant value for mass production.
- the present invention comprises a reading device, 10 and a weight body 20 , wherein the reading device 10 comprises at least one disk rotating means 11 and the weight body can be any object with sufficient weight above or under the reading device.
- the present invention is characterized in that the conventional elastomer is replaced by metal wire or metal plate to function as hanging means between the reading device 10 and the weight body 20 .
- the hanging means 30 can be fixed between the reading device 10 and the weight body 20 by screw 40 .
- the hanging means 30 of the present invention is made of metal wire and can be bent to desired shape. Both ends of the hanging means 30 are bent to form loop 31 such that the hanging means 30 can be fixed between the reading device 10 and the weight body 20 by screw 40 .
- the hanging means 30 of the present invention is made of metal plate and can be bent to desired shape. Both ends of the hanging means 30 are bent to on loop 31 such that the hanging means 30 can be fixed between the reading device 10 and the weight body 20 by screw 40 .
- the mechanical properties of metal materials have a great similarity over the different batches of product such that metal materials are advantageous to use as hanging means between the weight body and the reading device. Moreover, the mechanical properties of metal materials are less thermal sensitive in ordinary environment (5° C. ⁇ 60° C.), thus provides enhanced stability.
Abstract
Description
- The present invention relates to a vibration-reducing device for high-speed rotational body, more particularly, to a vibration-reducing device, by which the data reading/writing device such as CDROM has less vibration and better data accessing stability.
- As the accessing speed of CDROM increases, the vibration problem due to acentric and high speed rotation thereof. As a result, the data accessing s influence and the user will feel uncomfortable. Therefore, a vibration-reducing device is required for the high-speed CDROM.
- The conventional vibration-reducing device generally uses elastomer such as rubber or silicon rubber as hanging means between a weight body and the reading device to be suppressed vibration. However, the hanging means made of such elastomer has large variation in characteristics due to the difficulty in controlling the hardness and elastic constant (Young's modulus) of the elastomer materials. Therefore, the vibration-reducing effect is degraded and fail to meet the specifically-designed requirement. Moreover, the mechanical properties of the elastomer, such as elastic constant, hardness and damping ratio, are highly thermal dependent. The designed parameters of the hanging means even has great variation over an ordinary environment (5° C. ˜u60° C.), thus degrades the vibration-reducing effect.
- It is an object of the invention to provide a vibration-reducing device, wherein metal wire or metal plate is used to replace the elastomer member as hanging means between the weight body and the reading device. The mechanical properties of metal materials have a great similarity over the different batches of product such that metal materials are advantageous to use as hanging means between the weight body and the reading device. Moreover, the mechanical properties of metal materials are less thermal sensitive in ordinary environment (5° C. ˜60° C.), thus provides enhanced stability.
- The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
- FIG. 1 shows the model of spring-mass system for the present invention;
- FIG. 2 shows the relationship between vibrational displacement and the angular speed of the optical disk to be accessed;
- FIG. 3 is the perspective view of the invention;
- FIG. 4 is the perspective view of the first embodiment of hanging means in the present invention;
- FIG. 5 is the perspective view of the second embodiment of hanging means in the present invention;
- FIG. 6 is the perspective view of the third embodiment of hanging means in the present invention; and
- FIG. 7 is the perspective view of the fourth embodiment of hanging means in the present invention.
- As shown in FIG. 1, the principle of the vibration-reducing device of the present invention can be explained with reference a model of spring-mass system, wherein A denotes the housing of the reading device, m1 the reading device, m2 the weight body, k1, C1 the elastic constant and damping constant of the hanging means between the reading device and the housing, k2, C2 the elastic constant and damping constant of the hanging means between the reading device and the weight body. F0 the centrifugal force of the reading device and ω the angular speed of the disk.
- The high-speed CDROM is generally designed to operate in constant angular speed and k2/m2 is designed to be square of the angular speed, i.e.
- ω2=k2/m2
- The vibration of the reading device caused by the acentric disk will transfer to the weight body (m2) at the designed angular speed. The vibration of the reading device will be reduced by the transferring action.
-
- wherein ω11 2=k1/m1, and ω22 2=k2/m2 The vibration of the reading device is zero when the angular speed of the disk is the designed value, i.e., ω/ω22=ωdisk/ω22=1. FIG. 2 shows the variation of X1k1/F0 with ω/107 22 and provided that u=m2/m1=0.2 and ω22/ω11=1.0. As shown in this figure, the vibration X1 is very sensitive to ω/ω22. The vibration-reducing effect will be degraded and the vibration is seriously increased, even w slightly deviates from ω22. In other word, the parameters k2 and m2, should be well controlled to ensure the quantity ω22(={square root}{square root over (k2/m2)}). The present invention uses the fact that metal materials have stable thermal properties to keep k2 at constant value for mass production.
- As shown in FIG. 3, the present invention comprises a reading device,10 and a
weight body 20, wherein thereading device 10 comprises at least one disk rotating means 11 and the weight body can be any object with sufficient weight above or under the reading device. The present invention is characterized in that the conventional elastomer is replaced by metal wire or metal plate to function as hanging means between thereading device 10 and theweight body 20. The hanging means 30 can be fixed between thereading device 10 and theweight body 20 byscrew 40. - As shown in FIGS.4 to 6, the hanging means 30 of the present invention is made of metal wire and can be bent to desired shape. Both ends of the hanging means 30 are bent to form
loop 31 such that the hangingmeans 30 can be fixed between thereading device 10 and theweight body 20 byscrew 40. - As shown in FIG. 7, the hanging means30 of the present invention is made of metal plate and can be bent to desired shape. Both ends of the hanging means 30 are bent to on
loop 31 such that the hangingmeans 30 can be fixed between thereading device 10 and theweight body 20 byscrew 40. - In the present invention, the mechanical properties of metal materials have a great similarity over the different batches of product such that metal materials are advantageous to use as hanging means between the weight body and the reading device. Moreover, the mechanical properties of metal materials are less thermal sensitive in ordinary environment (5° C. ˜60° C.), thus provides enhanced stability.
- Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/285,840 US6334372B2 (en) | 1999-04-02 | 1999-04-02 | Vibration-reducing device for high-speed rotational body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/285,840 US6334372B2 (en) | 1999-04-02 | 1999-04-02 | Vibration-reducing device for high-speed rotational body |
Publications (2)
Publication Number | Publication Date |
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US20010029806A1 true US20010029806A1 (en) | 2001-10-18 |
US6334372B2 US6334372B2 (en) | 2002-01-01 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/285,840 Expired - Lifetime US6334372B2 (en) | 1999-04-02 | 1999-04-02 | Vibration-reducing device for high-speed rotational body |
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US (1) | US6334372B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7032227B2 (en) | 2000-08-14 | 2006-04-18 | Twin Communications Of America, Inc. | Portable operating environment for information devices |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8144431B2 (en) * | 2007-04-04 | 2012-03-27 | Hitachi Global Storage Technologies, Netherlands B.V. | Flex cable assembly for vibration reduction in HDD applications |
DE102010055437B4 (en) * | 2010-12-21 | 2014-04-03 | Multivac Sepp Haggenmüller Gmbh & Co. Kg | Mounting plate for a machine base |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3854347A (en) * | 1973-08-15 | 1974-12-17 | J Hellerich | Dynamic balancing device for a computer disc memory |
JPS5792469A (en) * | 1980-12-01 | 1982-06-09 | Hitachi Ltd | Magnetic disk storage device |
US4491888A (en) * | 1982-06-28 | 1985-01-01 | Atasi Corporation | Memory storage apparatus having vibration-dampened base plate arrangement |
US4598328A (en) * | 1983-05-09 | 1986-07-01 | Xerox Corporation | Mechanical damper for disk drives having band drive actuators |
US4683505A (en) * | 1984-12-24 | 1987-07-28 | International Business Machines Corporation | Alternately centered disk pack assembly and method |
JPS62112273A (en) * | 1985-11-12 | 1987-05-23 | Matsushita Electric Ind Co Ltd | Head shifting damper device |
JPS6390061A (en) * | 1986-10-02 | 1988-04-20 | Seiko Epson Corp | Magnetic recording device |
US5130870A (en) * | 1990-12-21 | 1992-07-14 | Seagate Technology, Inc. | Information storage disc balance weight |
DE4108331C2 (en) * | 1991-03-14 | 1994-11-10 | Digital Equipment Int | Apparatus and method for releasably attaching a stack of disks to a hub / shaft device of a disk store, and disk stores with such a device |
US5167167A (en) * | 1991-11-18 | 1992-12-01 | United Technologies Corporation | Rotor trim balancing |
JP2508955B2 (en) * | 1992-04-20 | 1996-06-19 | ソニー株式会社 | Sliding magnetic head for magneto-optical recording |
US5422776A (en) * | 1993-12-27 | 1995-06-06 | Maxtor Corporation | Improvement in a magnetic disk drive for balancing a disk pack assembly |
US5598306A (en) * | 1994-07-29 | 1997-01-28 | International Business Machines Corporation | Damping post for reducing acoustic noise in a disk drive |
US5555144A (en) * | 1995-01-12 | 1996-09-10 | Seagate Technology, Inc. | Balancing system for a disc drive disc assembly |
TW327474U (en) * | 1997-01-09 | 1998-02-21 | Lite On Technology Corp | Compact disk supporting device |
KR19990008845A (en) * | 1997-07-04 | 1999-02-05 | 윤종용 | VCM damper on hard disk drive |
US5907452A (en) * | 1997-10-20 | 1999-05-25 | International Business Machines Corporation | Apparatus and method to dampen flex cable vibration to disk drive actuator |
KR100267368B1 (en) * | 1998-04-11 | 2000-10-16 | 윤종용 | Cover apparatus for hard disk drive |
-
1999
- 1999-04-02 US US09/285,840 patent/US6334372B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7032227B2 (en) | 2000-08-14 | 2006-04-18 | Twin Communications Of America, Inc. | Portable operating environment for information devices |
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US6334372B2 (en) | 2002-01-01 |
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Owner name: LITE-ON TECHNOLOGY CORP., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KUO, LIH-HWA;TSAI, JENN-SHING;REEL/FRAME:009882/0448 Effective date: 19990326 |
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