CN1153194C - Objective driver with auxiliary magnetic support - Google Patents
Objective driver with auxiliary magnetic support Download PDFInfo
- Publication number
- CN1153194C CN1153194C CNB021036179A CN02103617A CN1153194C CN 1153194 C CN1153194 C CN 1153194C CN B021036179 A CNB021036179 A CN B021036179A CN 02103617 A CN02103617 A CN 02103617A CN 1153194 C CN1153194 C CN 1153194C
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- Prior art keywords
- permanent magnet
- iron core
- magnetic
- objective lens
- present
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- Expired - Fee Related
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000000153 supplemental effect Effects 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 abstract description 14
- 238000013016 damping Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 2
- 239000003302 ferromagnetic material Substances 0.000 abstract 1
- 239000000725 suspension Substances 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000007659 motor function Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- -1 this Chemical group 0.000 description 1
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Abstract
The present invention relates to an objective lens drive device with magnetic auxiliary support, which comprises a movable component, a fixed component and four linear elastic support components connected with the two components, wherein an objective lens and servo drive coils are arranged on the movable component, and a permanent magnet is arranged on the fixed component. The present invention is characterized in that an iron core made by ferromagnetic materials is also arranged on the movable component, and the iron core is arranged on a central axis of magnetic acting force of the permanent magnet; the present invention can also interchange the installation positions of the drive coils and the iron core and the position of the permanent magnet. Compared with the prior art, the present invention is additionally provided with the magnetic iron core, interattraction is formed between the iron core and the permanent magnet so as to generate additionally auxiliary support force, and thus, the present can increase damping of the movable component; the present invention effectively overcomes additional vibration force generated by an optical head because of vibration, and thus, the present invention has better vibration resistant performance; the objective lens drive device with four elastic support can be normally operated and used in the occasion of strong vibration.
Description
Technical field
The present invention relates to the objective lens device that uses in a kind of optical recording/dubbing system of CD.Be particularly related to a kind of structural design of the objective lens for optical pickup drive unit with supplemental support.
Background technology
Usually, in the optical recording/dubbing system of CD, the light beam that optical head focuses on the CD should be accurately, and object lens should be adjusted focal position in the direction along optical axis for this reason, and this driving object lens are called focusing along the servo adjustment of optical axis direction.Simultaneously, be imaged on light beam on the optical disc information face and should follow the tracks of session on the CD exactly, thisly radially drive object lens and be called tracking so that light beam is correctly followed the tracks of the servo adjustment of session.Therefore, optic probe unit should have the motor function that realize to focus on and follow the tracks of on this two-dimentional servo direction.For making object lens have the freedom of motion of this two-dimensional directional, object lens supporting way commonly used is to use four elastic yarns that objective holder is connected with the optical head firm banking, and the movable part that is about to be equipped with object lens is connected with fixed part.
In application number is 99107438.6 patent of invention a kind of objective lens device with two-dimentional servo function is disclosed, as shown in Figure 1.The object lens 11 that are fixed on the movable part 1 are connected on the fixed part 2 by four elastic support members 31,32 (being elastic filament).These four isometric elastic support members will have along the degree of freedom that focuses on and the tracking both direction moves the object lens 11 on the movable part 1, and can guarantee that when carrying out servo adjustment object lens 11 can be supported on a stable equilibrium position.
But in some use occasions, optical head will be subjected to stronger mechanical vibration.As the CD public address system on the automobile, will be subjected to vibration force along with travelling of automobile during work.The supporting way of this four elasticity suspensions is when optical head is vibrated, and the objective holder that will cause suspension to support also certainly leads to additional vibration.This additional vibration will destroy the operate as normal of optical head.Therefore, the optical head of four general elasticity suspension supporting way is difficult in the occasion work of judder.
Summary of the invention
The objective of the invention is on the basis of existing technology, propose a kind of objective lens device that has the magnetic supplemental support,, improve anti-seismic performance to reach the increase damping.
The objective of the invention is to be achieved through the following technical solutions:
A kind of objective lens device that has the magnetic supplemental support, include a movable part and a fixed part, and four elastic support members that connect these two parts, be equiped with object lens and servo driving coil on the said movable part, said fixed part is provided with permanent magnet, it is characterized in that also being provided with the iron core of being made by ferrimagnet on the said movable part, this iron core is arranged on the central axis of permanent magnet magnetic acting force.
In the above-mentioned objective lens device, servo driving coil and iron core installation site can with exchange with magnet, that is: a kind of objective lens device that has the magnetic supplemental support, include a movable part and a fixed part, and four elastic support members that connect these two parts, said movable part is provided with object lens and permanent magnet, said fixed part is provided with the servo driving coil, it is characterized in that also being provided with the iron core of being made by ferrimagnet on the said fixed part, described iron core is arranged on the central axis of permanent magnet magnetic acting force.
On the basis of such scheme, in order further to improve the accuracy of alignment of iron core, promptly iron core is positioned on the central shaft of permanent magnet magnetic acting force all the time when static state, at described permanent magnet on the one side of coil, its magnetic pole is divided into 2 half, and half is the N utmost point, and half is the S utmost point; Or when permanent magnet magnetization, on the one side of coil, the cross curve of its magnetic pole by the center is divided into four at permanent magnet, two diagonal angles be the N utmost point, two diagonal angles is the S utmost point in addition.
The present invention compared with prior art, owing to increased a magnetive cord, attract each other between iron core and permanent magnet, produce additional supplemental support power, so can increase the damping of movable part, effectively overcome because therefore the extraneous vibration power that sharp pounding produces optical head have better anti-seismic performance, thereby made have the objective lens device of four resiliency supported having strong vibrations occasion energy operate as normal and use.
Description of drawings
Fig. 1: the structural representation that uses the objective lens device of four elastic support members in the expression prior art.
Fig. 2 represents a kind of embodiment of the present invention, promptly increases the structural representation of the objective lens device of magnetic supplemental support power.
Fig. 3 is the side view of Fig. 2.
Fig. 4 is illustrated in permanent magnet on the one side of coil, and magnetic pole is divided into upper and lower two-part synoptic diagram.
Fig. 5 is illustrated in permanent magnet on the one side of coil, and magnetic pole is divided into the synoptic diagram of 4 parts.
Embodiment
Below with reference to accompanying drawing the specific embodiment of the present invention is described in further detail:
Fig. 2, Fig. 3 represent the structural representation of a kind of embodiment objective lens device of the present invention.Be equiped with two permanent magnets 9 of symmetric arrangement on the fixed part 4, permanent magnet is fixed on the yoke 8.Movable part 5 is coupled together by four elastic support members 7 (4 metal suspensions) and fixed part 4.Be equiped with object lens 6 on the movable part 5, servo driving coil 10 is bonded on the movable part 5, the iron core of being made by ferrimagnet 11 is bonded on the drive coil 10, iron core 11 fixedly becomes one by coil 10 and movable part 5 like this, and locus upper core 11 is positioned on the central axis of permanent magnet 9.During servo adjustment, by the servocontrol electric current, coil 10 drives movable part 5 and object lens 6 and moves under the effect of electric current electromagnetic force in the drive coil 10.In servo move, be fixed on the attractive force that iron core 11 on the movable part 5 will be subjected to permanent magnet 9, increased the kinetic damping of movable part 5 like this, thereby increased the performance of antidetonation.
Fig. 4 represents a kind of structure of permanent magnet 9, in its one side towards coil, can be divided into 2 half during magnetization, and half is the N utmost point, and half is the S utmost point, can improve the accuracy of alignment of iron core like this, and iron core is positioned on the central shaft of permanent magnet magnetic acting force all the time when promptly static.
Fig. 5 represents the another kind of structure of permanent magnet 9, in its one side towards coil, also can be divided into four by the cross curve by the center during magnetization, two diagonal angles be the N utmost point, in addition two diagonal angles is the S utmost point.Can further improve the accuracy of alignment of iron core so equally.
Claims (6)
1. objective lens device that has the magnetic supplemental support, comprise a movable part and a fixed part, and four elastic support members that connect these two parts, be equiped with object lens and servo driving coil on the said movable part, be equiped with permanent magnet on the said fixed part, it is characterized in that also being provided with the iron core of being made by ferrimagnet on the said movable part, described iron core is arranged on the central axis of permanent magnet magnetic acting force.
2. according to the described a kind of objective lens device that has the magnetic supplemental support of claim 1, it is characterized in that at described permanent magnet the magnetic pole of its permanent magnet is divided into 2 half on the one side of servo driving coil, half is the N utmost point, and half is the S utmost point.
3. according to the described a kind of objective lens device of claim 1, it is characterized in that at described permanent magnet on the one side of drive coil, the magnetic pole of its permanent magnet is divided into four by the cross curve by the center, two diagonal angles be the N utmost point, in addition two diagonal angles is the S utmost point.
4. objective lens device that has the magnetic supplemental support, include a movable part and a fixed part, and four elastic support members that connect these two parts, said movable part is provided with object lens and permanent magnet, said fixed part is provided with the servo driving coil, it is characterized in that also being provided with the iron core of being made by ferrimagnet on the said fixed part, described iron core is arranged on the central axis of permanent magnet magnetic acting force.
5. according to the objective lens device that has the magnetic supplemental support as claimed in claim 4, it is characterized in that at permanent magnet its magnetic pole is divided into 2 half on the one side of drive coil, half is the N utmost point, and half is the S utmost point.
6. according to the described objective lens device that has the magnetic supplemental support of claim 4, it is characterized in that at permanent magnet on the one side of coil, the magnetic pole of its permanent magnet is divided into four by the cross curve by the center, two diagonal angles be the N utmost point, in addition two diagonal angles is the S utmost point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021036179A CN1153194C (en) | 2002-01-29 | 2002-01-29 | Objective driver with auxiliary magnetic support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021036179A CN1153194C (en) | 2002-01-29 | 2002-01-29 | Objective driver with auxiliary magnetic support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1371095A CN1371095A (en) | 2002-09-25 |
| CN1153194C true CN1153194C (en) | 2004-06-09 |
Family
ID=4739838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021036179A Expired - Fee Related CN1153194C (en) | 2002-01-29 | 2002-01-29 | Objective driver with auxiliary magnetic support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1153194C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011021414A (en) * | 2009-07-17 | 2011-02-03 | Nifco Inc | Assist device for movable body |
-
2002
- 2002-01-29 CN CNB021036179A patent/CN1153194C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1371095A (en) | 2002-09-25 |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |