CN2906819Y - Voice coil motor device - Google Patents
Voice coil motor device Download PDFInfo
- Publication number
- CN2906819Y CN2906819Y CN 200620057639 CN200620057639U CN2906819Y CN 2906819 Y CN2906819 Y CN 2906819Y CN 200620057639 CN200620057639 CN 200620057639 CN 200620057639 U CN200620057639 U CN 200620057639U CN 2906819 Y CN2906819 Y CN 2906819Y
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- CN
- China
- Prior art keywords
- coil
- magnet
- magnetic
- voice coil
- coil motor
- Prior art date
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- Expired - Fee Related
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Abstract
The utility model relates to a sound ring motor, which is used to drive a magnetic head assembly with a coil, comprising a base plate under the coil and a top plate above the coil. A pair of magnetic iron are arranged under and above the coil, wherein one magnetic iron is fixed at the top plate and the other one is fixed at the base plate; and the upper magnetic and the lower magnetic iron are arranged symmetrically.
Description
[technical field]
The utility model relates to a kind of voice coil motor, specifically relates to the voice coil motor that a kind of balance drives the magnetic head head stack.
[background technology]
Along with the increase of information processing capacity, traditional information recode and reproducer such as CD and tape can not satisfy growing high capacity demand, so hard disk drive (HDD) has become more and more universal as a kind of memory storage.Hard disk drive comprises the disk that is used for record data and be used for writing magnetic head with sense data between it and this disk.Magnetic head comprises as the magnetic head element of thin-film component and has the slider pad of having arranged magnetic head element in its surface.This magnetic head element comprises according to the data that will be recorded on the disk and converts the electrical signal to the write element in magnetic field and will convert the read element of electric signal from the magnetic field that this disk provides to.Usually, write element and read element are formed in the thin-film component.
Please refer to Fig. 1, traditional hard disk drive also comprises head stack, is used for magnetic head is moved to desirable position on the disk.This head stack one side is provided with a coil 50 ', and the coil 50 ' of energising is subjected to Lorentz force action in magnetic field, and drives the head stack rotation.Head stack is driven by voice coil motor (VCM) and rotates around pivot, moves radially magnetic head above the disk of rotation, magnetic head can be conducted interviews to predetermined magnetic track, thereby finish reading and writing data.
In order to form magnetic field, traditional voice coil motor comprises the top board 10 ' that is positioned at driver coil both sides about in the of 50 ' and base plate 20 ' and is fixed on magnet 40 ' on the base plate 20 '.For the assembly that reduces hard disk drive, alleviate hard disk drive weight and save cost, traditional voice coil motor only is provided with a magnet 40 ', magnet 40 ' is with the top board 10 ' magnetization of coil 50 ' top, the magnetic line of force passes coil 50 '.
Please refer to Fig. 2, but, tradition voice coil motor formed magnetic field between magnet 40 ' and top board 10 ', the magnetic line of force at magnet 40 ' middle part perpendicular to magnet 40 ' and top board 10 ', but at magnet 40 ' edge, the closed magnetic line of force is rendered as arc-shaped bend, and with respect to magnet 40 ' and top board 10 ' inclination and offset.According to the Lorentz force principle, under the situation of magnet 40 ' the middle part magnetic line of force perpendicular to coil 50 ', suffered Lorentz force is converted to the torque to head stack fully; But under the situation of magnet 40 ' edge magnetic line of force curved incline, a suffered Lorentz force part is converted to the torque to head stack, another part then is converted to the moment of torsion to head stack, make head stack that twisting or inclination also take place except rotation around the shaft, influence magnetic head from disk read/write data.
[summary of the invention]
The purpose of this utility model is to propose the voice coil motor that a kind of balance drives the magnetic head head stack.
The technical scheme that realizes above-mentioned purpose is: a kind of voice coil motor, be used for driving a head stack with coil, and comprise that a base plate, that is positioned at the coil below is positioned at the top board of coil top.Pair of magnet is arranged on the upper and lower of described coil, and wherein a magnet is fixed on the top board, and another magnet is fixed on the base plate, and described coil is between two magnet.
Described upper magnet and bottom magnet are and are symmetrical arranged.
The utility model adopts technique scheme, its beneficial technical effects is: 1) the utility model voice coil motor forms the magnetic field that drives the head stack coil by a pair of magnet of symmetry in opposite directions is set, the vertical evenly setting of the magnetic line of force by coil, make the direction of the suffered Lorentz force of coil perpendicular to magnetic line of force direction, coil is not subjected to the external force of other decomposition except the torque that is subjected to Lorentz force and is transformed.2) pair of magnet of the present utility model is provided with in the coil symmetria bilateralis, makes in a wider context all parallel to each other and plane that determine perpendicular to coil by the magnetic line of force of coil.
[description of drawings]
Below by embodiment also in conjunction with the accompanying drawings, the utility model is described in further detail:
Fig. 1 is the three-dimensional exploded view of conventional hard disc drive voice coil motor.
Fig. 2 is the magnetic line of force distribution plan of conventional hard disc drive voice coil motor.
Fig. 3 is the three-dimensional exploded view of the utility model voice coil motor.
Fig. 4 is the magnetic line of force distribution plan of the utility model voice coil motor.
[embodiment]
A kind of voice coil motor is used for driving the head stack 50 with coil.
Described head stack 50 comprises a bearing 51 and is assembled in some actuating arms 53 of bearing.Described head stack 50 bearings 51 centers have a screw.The screw of described head stack 50 bearings 51 is accommodated one and is fixed in the back shaft (not indicating) of base, thereby described head stack 50 rotations are fixed on the base of hard disk drive.One end of described bearing 51 connects the coil 57 of an induced magnetism.Four actuating arms 53 that are installed in bearing 51 are formed two pairs of magnetic head groups in opposite directions, interval one separator (figure does not show) between each relative magnetic head group.Each actuating arm 53 connects a loading beam 55.Each loading beam 55 terminal magnetic head 56 that hang read/write data.After magnetic head 56 reading of data, data are sent to a nearest signal amplification circuit that is installed in head stack 50, the signal that reads is amplified.Amplifying signal is sent to a control circuit board that is installed in hard disk drive base below by a flexible circuit board 58 that links hard disk drive base contact maker 59 and carries out data processing.
Described voice coil motor comprises that top board 10 and that a base plate 20, that is positioned at coil 57 belows is positioned at coil 57 tops is fixed in the magnet 40 of the bottom of base plate 20, fix a upper magnet 30 with respect to bottom magnet 40 on the described top board 10, after the hard disk drive assembling was finished, described coil 57 was between upper magnet 30 and bottom magnet 40.By this is set in opposite directions upper magnet and bottom magnet 30,40 are formed the magnetic field that drives head stack coil 57, because the vertical evenly distribution of the magnetic line of force by coil 57, make the direction of coil 57 suffered Lorentz forces perpendicular to magnetic line of force direction, coil 57 is not subjected to the external force of other decomposition except the torque that is subjected to Lorentz force and is transformed.Because described upper magnet 30 and bottom magnet 40 in coil 57 both sides in opposite directions and be and be symmetrical arranged, make in a wider context all parallel to each other and plane that determine perpendicular to coil 57 by the magnetic line of force of coil 57.
During head stack work, the coil 57 of energising is subjected to the moment of long-range navigation taste power generation perpendicular to the magnetic line of force under magnetic field, and moment drives actuating arm 53 simultaneously and rotates, and head stack 50 cue head 56 under the control of hard disk drive servo-drive system is finished and sought rail.When the voice coil motor of head stack 50 drives actuating arm 53 magnetic head 56 is positioned at the needed radial position of some disks of canned data, the end that magnetic head 56 is suspended on head stack 50 loading beams 55 carries out read to the disk of hard disk drive.
Claims (2)
1, a kind of voice coil motor, be used for driving a head stack with coil, comprise that a base plate, that is positioned at the coil below is positioned at the top board of coil top, it is characterized in that: pair of magnet is arranged on the upper and lower of described coil, wherein a magnet is fixed on the top board, another magnet is fixed on the base plate, and described coil is between two magnet.
2, voice coil motor according to claim 1 is characterized in that: described upper magnet and bottom magnet are and are symmetrical arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620057639 CN2906819Y (en) | 2006-04-07 | 2006-04-07 | Voice coil motor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620057639 CN2906819Y (en) | 2006-04-07 | 2006-04-07 | Voice coil motor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2906819Y true CN2906819Y (en) | 2007-05-30 |
Family
ID=38115460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620057639 Expired - Fee Related CN2906819Y (en) | 2006-04-07 | 2006-04-07 | Voice coil motor device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2906819Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345069B (en) * | 2007-07-09 | 2011-09-14 | 新科实业有限公司 | Voice coil motor and disk drive unit with the same |
-
2006
- 2006-04-07 CN CN 200620057639 patent/CN2906819Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345069B (en) * | 2007-07-09 | 2011-09-14 | 新科实业有限公司 | Voice coil motor and disk drive unit with the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070530 Termination date: 20140407 |