CN1311446C - Objective driving device and optical disc device - Google Patents
Objective driving device and optical disc device Download PDFInfo
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- CN1311446C CN1311446C CNB2004100476692A CN200410047669A CN1311446C CN 1311446 C CN1311446 C CN 1311446C CN B2004100476692 A CNB2004100476692 A CN B2004100476692A CN 200410047669 A CN200410047669 A CN 200410047669A CN 1311446 C CN1311446 C CN 1311446C
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- coil
- object lens
- outer circumferential
- circumferential side
- coil unit
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Abstract
Provided is an objective lens driver which can tilt an objective lens in the same direction as the direction of the warpage of an optical disk without entailing the degradation in thrust and an increase in components. A focusing coil to be operated in a direction where the objective lens is brought near to or apart from the optical disk is made into a duplex type dividing the coil sections to the inner peripheral side and outer peripheral side of the optical disk such that the overall length of the coil wire facing a magnetic circuit in the coil section on the outer peripheral side of the focusing coil is made greater than the overall length of the coil wire facing the magnetic circuit in the coil section on the inner peripheral side of the focusing coil.
Description
Technical field
The present invention relates in the CD of information on the record surface of playback record at CD or recorded information, drive objective lens device, further relate to the laser head and the optical disc apparatus that have it object lens of optical convergence on the record surface of CD.
Background technology
Recorded information on the recording medium of plate-like, perhaps read the also optical disc apparatus of the information of playback of recorded, because can be at disc recording than relatively large information, again, medium also are the processing that is easy to of rigidity, so can be as the external record device of computing machine and the pen recorder of video/audio.
In this optical disc apparatus, going up the device that drives the object lens of optical convergence on the record surface on the CD at focus direction (approaching/away from the direction of cd side) and tracking direction (radial direction of dish) is objective lens device.Generally, objective lens device by the mobile unit that comprises object lens, support the holding components of this mobile unit and the magnetic circuit of forming by deflection coil and permanent magnet to constitute.Focusing coil and tracking coil are installed on mobile unit, by in focusing coil, adding drive current, on focus direction, drive mobile unit by this drive current and the electromagnetic force that generates from the magnetic flux effect of permanent magnet, equally by adding drive current in tracking coil, the electromagnetic force that is generated by this drive current and magnetic flux effect from permanent magnet drives mobile unit on tracking direction.
Here, because crooked when producing on CD, when the inclined light shaft ground of object lens fixing disc, the light of being assembled by object lens produces the comet aberration during by optic disc base board broadens convergent point, so generation can not correctly be write down or the problem of playback information.Therefore, need and tilt correspondingly to adjust the mechanism of the inclination of object lens with the bending of CD.
The position of CD and object lens relation is, when making CD up, object lens below the time, in the crooked upward situation of CD, CD is away from object lens, in the crooked downwards situation of CD, CD is near object lens.At this moment,, object lens are moved upward, object lens are moved downwards downwards for crooked CD for crooked upward CD for the focus that makes object lens overlaps with CD.
Here, if when object lens object lens when the top of focus direction is mobile oblique to interior all inclinations of CD, when object lens object lens when the below of focus direction is mobile tilt to the outer circumferential side of CD, then can reduce the influence of CD bending.
As the example of the existing structure of objective lens device, the central point that can enumerate the Mobility Center point that makes coil and magnetic with the rectangular direction of the optical axis of object lens on dispose the example of magnetic isolator.Again, the spring rate that can change the elastomeric element that the object lens holding components that position ground will support object lens and fixed part link up is documented in the 2001-93178 patent gazette of Japanese calendar year 2001 announcement for the different example of the left and right sides of objective lens optical axis.
In above-mentioned prior art, the magnetic center is disposed isolator for hub of a spool, but this has obtained thrust has reduced efficient.Again, the spring rate that exists elastomeric element has increased the kind of parts for the left and right sides difference of objective lens optical axis, makes the management of parts and disposes complicated such problem.
Summary of the invention
The purpose of this invention is to provide and do not reduce thrust, parts are increased and complex managementization, can make object lens at the objective lens device that tilts with the bending of CD and the identical direction that tilts, provide with this objective lens device, recording of information and good laser head and the optical disc apparatus of reproducing characteristics.
The present invention has following formation in order to achieve the above object.
A kind of objective lens device, have with optical convergence the object lens on the record surface of CD and as be used to make above-mentioned object lens near or away from the direction of CD on the focusing coil and the permanent magnet of the driver part that moves, it is characterized in that: with above-mentioned focusing coil is that the center is divided at two coil units of interior all sides of CD and outer circumferential side and with two coil units and is connected in series with object lens, makes in the coil unit of outer circumferential side the length with the opposed winding wire of above-mentioned permanent magnet longer than the length with the opposed winding wire of above-mentioned permanent magnet in the coil unit in interior all sides.
In formation as described above, when the force rate that produces in the coil unit that makes at the outer circumferential side of focusing coil when generation power is big in the coil unit of interior all sides of above-mentioned focusing coil, when object lens from the reference position when moving near the direction of CD, object lens are oblique to interior all inclinations of CD, when object lens from the reference position when moving away from the direction of CD, object lens tilt to the outer circumferential side of CD.So, for having crooked CD, when object lens when focus direction moves, object lens tilt at the crooked equidirectional with CD, thus can access the record and the reproducing characteristics of good information, and, can not reduce thrust, also can not increase the kind of parts.
A kind of objective lens device, have the object lens of optical convergence on the record surface of CD, with as be used to make above-mentioned object lens near or away from the direction of CD on the focusing coil and the permanent magnet of the driver part that moves, it is characterized in that: with above-mentioned focusing coil is that the center is divided at two coil units of interior all sides of CD and outer circumferential side and with two coil units and is connected in series with object lens, make in the coil unit of outer circumferential side with the length of the winding wire of each circle of the opposed coil of permanent magnet with in the coil unit of interior all sides with the equal in length of the winding wire of each circle of the opposed coil of permanent magnet, make in the number of turns of the coil unit of outer circumferential side more than the number of turns at the coil unit of interior all sides.
A kind of objective lens device, have with optical convergence the object lens on the record surface of CD and as be used to make above-mentioned object lens near or away from the direction of CD on the focusing coil and the permanent magnet of the driver part that moves, it is characterized in that: with above-mentioned focusing coil is that the center is divided at interior all sides of CD and two coil units of outer circumferential side with object lens, the shape of these two coil units and the number of turns equate, make in the resistivity of the coil unit of outer circumferential side forr a short time than the resistivity at the coil unit of interior all sides, two coil units are connected in parallel.
A kind of optical disc apparatus, the information of playback CD or record information on the CD is characterized in that: have technique scheme 1 any one described objective lens device in the technical scheme 3.
Description of drawings
Fig. 1 is the stravismus assembly drawing of an embodiment of the objective lens device relevant with the present invention,
Fig. 2 is the oblique view with optical disc apparatus of objective lens device shown in Figure 1,
Fig. 3 is the block scheme of the driver element of optical disc apparatus shown in Figure 2,
Fig. 4 is the figure of the principle of work of exponent mirror drive to Fig. 5,
Fig. 6 to Fig. 8 be the objective lens device relevant with the present invention other embodiment oblique view and above figure.
Embodiment
We use the description of drawings embodiments of the invention.
Fig. 1 is the exploded perspective view of the formation of the expression objective lens device relevant with the embodiment of optical disc apparatus of the present invention, Fig. 2 and Fig. 3 represent that with the laser head of objective lens device of the present invention and the figure of optical disc apparatus Fig. 4 is the figure of the principle of work of expression objective lens device of the present invention.In Fig. 1, the direction of x axle is the tangential direction of unillustrated CD among the figure, and the direction of y axle is the tracking direction as the radial direction of CD, and the direction of z axle is the focus direction as the CD direction of object lens 1.
Here, object lens 1, lens carrier 2, focusing coil 3, tracking coil 4 and be connected substrate 21a, 21b and constitute mobile unit.
With direction of magnetization become the axial permanent magnet 11a of x among the figure, 11b, 11c, the both sides of 11d the is mounted and fixed on lens carrier 2 parallel with tracking direction, on the extrinsic deflection coil 9 as the deflection coil part that constitutes by magnetic.
Make the inner deflecting coil 10a, the 10b that extend out from the bottom surface of extrinsic deflection coil 9 be positioned at being configured medially of focusing coil 3a, 3b.Therefore, form the magnetic circuit that the magnetic flux from permanent magnet 11a～11d passes through to extrinsic deflection coil 9 from inner deflecting coil 10a, 10b.
As shown in Figure 2, optical disc apparatus 100 connecting gear that has Spindle Motor 120, the laser head 110 that makes CD rotation and laser head 110 is moved at the radial direction of CD.
In Fig. 3, in laser head 110, the light that penetrates from the semiconductor laser 111 as light source is focused on the CD 101 by collimation lens 112, prism 113, object lens 1.Reflected light from CD 101 incides photodetector 115 by object lens 1, prism 113, detection lens 114.From the signal that obtains by photodetector 115, generate replay signal, focus error signal and tracking error signal.Focus error signal and tracking error signal become focus drive signal and follow the tracks of drive signal by focusing driving circuit 106, tracking driving circuit 107 respectively, to focusing coil 3 and tracking coil 4 supplying electric currents.By the electric current and the electromagnetic force that generates from the magnetic flux effect of permanent magnet 11a～11d that are added in the focusing coil 3, on focus direction, drive mobile unit, on tracking direction, drive mobile unit with the electromagnetic force that generates from the magnetic flux effect of permanent magnet 11a～11d by the electric current that is added in the tracking coil 4.
Here, make in the coil unit 3b of CD outer circumferential side with the total length of the opposed winding wire of permanent magnet of magnetic circuit than among the coil unit 3a in interior all sides with the total length of the opposed winding wire of permanent magnet of magnetic circuit reel longways above-mentioned focusing coil 3a, 3b.Specifically, as shown in Figure 1 and Figure 4, the number of turns of the coil unit 3b of outer circumferential side is reeled with Duoing than the number of turns of the coil unit 3a of interior all sides.
In such formation, as shown in Figure 4, when flowing through electric current in focusing coil, the power F2 that takes place in the coil unit 3b of outer circumferential side is bigger than the power F1 that takes place among the coil unit 3a in interior all sides.Therefore, around the support center C that determines by 4 holding components 6a, 6b, 6c, 6d, produce moment M.By this moment M the mobile unit that comprises object lens 1 is tilted around the support center C.When object lens 1 were moved upward, object lens 1 were oblique to interior all inclinations of CD, and when object lens 1 were mobile downwards, object lens 1 tilted to the outer circumferential side of CD.
The relation of the position of the bending of expression CD 101 and object lens 1 in Fig. 5.Fig. 5 (b) is that object lens 1 are in the figure of reference position when not having bending in the CD 101.In contrast, when CD 101 was crooked upward, for the focus that makes object lens 1 overlaps with CD 101, the outer circumferential side at CD 101 made object lens be moved upward more more as Fig. 5 (a).At this moment, because object lens 1 are oblique to interior all inclinations of CD 101, so can make the same direction that is tilted in of the bending of CD 101 and object lens 1.And for example when CD 101 was crooked downwards, the outer circumferential side at CD 101 made object lens 1 move downwards to Fig. 5 (c) more more like that.At this moment, because object lens 1 tilt to the outer circumferential side of CD 101, so at this moment also can make the same direction that is tilted in of the bending of CD 101 and object lens 1.
Here, the tiltangle of object lens is represented by following formula (1).
Δ z is the amount of movement of the focus direction of object lens 1, and b is the distance from the support center C to the place of application of force that is produced by focusing coil, and L is from supporting the distance of center C to each holding components.
Try to achieve for predetermined amount of movement from formula (1), obtain desired pitch angle and the thrust F1 of needs and the ratio of F2 for focus direction.
For example, b is 4mm if make, and L is 6mm, and the amount of movement Δ z of focus direction is 0.3mm, and is then best, and when tilting as tiltangle 0.1 ° the time, making F2 is 1.1 times of F1, and when tilting 0.2 ° the time, making F2 is 1.2 times of F1.
So, in the present embodiment, for example, when being 0.3mm, tilting 0.1 ° as tiltangle for amount of movement Δ z when focus direction, the number of turns of coil unit 3b that preferably makes the outer circumferential side of focusing coil is 1.1 times of the number of turns of the coil unit 3a of interior all sides.
Like this, by constituting objective lens device, when having bending on the promptly convenient CD, also can write down well or playback information.
At this moment, because can with in the permanent magnet configuration in effect magnetic field on the focusing coil on optimal position, so thrust is reduced for focusing coil.Again, because holding components can the identical parts of operating characteristic, so also can not increase the kind of parts.
In addition, as shown in Figure 1 and Figure 4, because in the coil unit 3a of interior all sides of focusing coil, the few shape of the number of turns by the coil layer outside forming, can make the height of coil unit 3a and 3b identical, so can make the space of the focusing coil 3 that is mounted on the lens carrier 2 identical with 3b for coil unit 3a.Thereby, because can make interior all side and the outer circumferential side symmetry of lens carrier 2, so be difficult to produce vibration not at CD.Again, different with shape among the 3b because it is poor to produce the section of coil layer in the coil unit 3a of interior all sides at coil unit 3a, so add apparent difference easily, can reduce wrong mistakenly possibility of taking coil unit when assembling.
Again, in the present embodiment, even if focusing coil 3 is divided into 2 coil units, also can focusing driving circuit of identical usefulness with prior art, so can constitute control system simply.
Secondly, other embodiments of the invention have been represented among Fig. 6.As mentioned above, in order to reduce the influence of CD bending, preferably make the power that produces among the coil unit 3a of force rate that in the coil unit 3b of the outer circumferential side of focusing coil 3, produces big in interior all sides.So, in the situation that does not have the such vibration problem of the 1st embodiment, can adopt the shape of focusing coil shown in Figure 63.
In Fig. 6 (a), make the number of turns of the coil unit 3b of outer circumferential side be mostly same as the previously described embodiments than the number of turns of the coil unit 3a of interior all sides, in order to change the number of turns, the height of the coil unit 3b of outer circumferential side is increased.
In Fig. 6 (b), make the width of tracking direction of coil unit 3b of outer circumferential side bigger than the coil unit 3a of interior all sides.Therefore, because the length with the opposed part of permanent magnet of the coil unit 3b of outer circumferential side is elongated, so can increase the power that in the coil unit 3b of outer circumferential side, produces.
In Fig. 6 (c), make the length of the tracking direction of coil unit 3b of outer circumferential side and vertical direction bigger than the coil unit 3a of interior all sides.Therefore, because the coil unit 3b of outer circumferential side with the opposed part of permanent magnet near permanent magnet, so can increase the power that in the coil unit 3b of outer circumferential side, produces.
Secondly, represented other other embodiment of the present invention among Fig. 7.Fig. 7 is the coil unit 3a of all sides in expression is reeled with separately winding wire and the coil unit 3b of outer circumferential side, and the figure that they are connected in parallel.At this moment, make the resistance value of coil unit 3b of outer circumferential side littler than the resistance value of the coil unit 3a of interior all sides.For example, preferably the wire rod as the coil unit 3b of outer circumferential side uses the resistivity material littler than the coil unit 3a of interior all sides, makes the size of coil unit identical with the number of turns.Specifically, the coil unit 3b with copper cash making outer circumferential side makes the coil unit 3a of interior all sides of aluminum steel.Again, when promptly box lunch uses the coil of identical material, the line of coil that also can be by making outer circumferential side directly than in the line footpath of coil of all sides thick, make the size of coil unit identical with the number of turns.
Like this, the resistance value of coil unit 3b by making outer circumferential side is littler than the coil unit 3a of interior all sides, and they are connected in parallel, can make the current ratio of the coil unit 3b that flows through outer circumferential side flow through in the electric current of coil unit 3a of all sides big, can increase the power that in the coil unit 3b of outer circumferential side, produces.Therefore because when object lens object lens when the top of focus direction is mobile oblique to interior all inclinations of CD, when object lens object lens when the below of focus direction is mobile tilt to the outer circumferential side of CD, so can reduce the influence of CD bending.
More than, Fig. 6, focusing coil 3 shown in Figure 7, because permutation ground any one coil unit of reeling easily, so have the effect of easy manufacturing.
Secondly, the formation of having represented the objective lens device relevant among Fig. 8 with other embodiment in addition of the present invention.In the present embodiment, object lens 51 are installed in the end of lens carrier 52.Focusing coil is made of 2 coil unit 53a, 53b being divided on tracking direction, is installed in altogether on the lens carrier 52 with tracking coil 54a, 54b.Inboard at 2 coil unit 53a, 53b of focusing coil disposes permanent magnet 61a, 61b respectively, clamps focusing coil and the tracker wire configuration permanent magnet 61c that encloses the land.
The end that object lens is configured in mobile unit is different with embodiment so far, but this point of 2 coil unit 53a, 53b that focusing coil is divided on tracking direction is identical.Even if in the present embodiment in order to reduce the influence of CD bending, also make the power the earth that produces among the coil unit 53a of force rate that in the coil unit 53b of the outer circumferential side of focusing coil, produces constitute focusing coil in interior all sides.As its shape, also can have any formation of so far stating that the number of turns of the coil unit 53b that makes outer circumferential side is Duoed etc. than the number of turns of the coil unit 53a of interior all sides.
In such formation, be identical because reduce the effect of the influence of CD bending, can cut down the number of tracking coil and the number of permanent magnet, so can reach the purpose that reduces cost.
If according to the present invention, then can provide and not reduce thrust, be not accompanied by again parts are increased and complex managementization, the objective lens device that object lens are tilted in the direction identical with inclination with the bending of CD, by using this objective lens device, provide good laser head of recording of information and reproducing characteristics and optical disc apparatus.
Claims (4)
1. objective lens device, have with optical convergence the object lens on the record surface of CD and as be used to make above-mentioned object lens near or away from the direction of CD on the focusing coil and the permanent magnet of the driver part that moves, it is characterized in that:
With above-mentioned focusing coil is that the center is divided at two coil units of interior all sides of CD and outer circumferential side and with two coil units and is connected in series with object lens, makes in the coil unit of outer circumferential side the length with the opposed winding wire of above-mentioned permanent magnet longer than the length with the opposed winding wire of above-mentioned permanent magnet in the coil unit in interior all sides.
2. objective lens device, have with optical convergence the object lens on the record surface of CD and as be used to make above-mentioned object lens near or away from the direction of CD on the focusing coil and the permanent magnet of the driver part that moves, it is characterized in that:
With above-mentioned focusing coil is that the center is divided at two coil units of interior all sides of CD and outer circumferential side and with two coil units and is connected in series with object lens, make in the coil unit of outer circumferential side with the length of the winding wire of each circle of the opposed coil of permanent magnet with in the coil unit of interior all sides with the equal in length of the winding wire of each circle of the opposed coil of permanent magnet, make in the number of turns of the coil unit of outer circumferential side more than the number of turns at the coil unit of interior all sides.
3. objective lens device, have with optical convergence the object lens on the record surface of CD and as be used to make above-mentioned object lens near or away from the direction of CD on the focusing coil and the permanent magnet of the driver part that moves, it is characterized in that:
With above-mentioned focusing coil is that the center is divided at interior all sides of CD and two coil units of outer circumferential side with object lens, the shape of these two coil units and the number of turns equate, make in the resistivity of the coil unit of outer circumferential side forr a short time than the resistivity at the coil unit of interior all sides, two coil units are connected in parallel.
4. optical disc apparatus, the information of playback CD or record information on the CD is characterized in that: have any one described objective lens device in the claim 1 to 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003204227A JP2005050414A (en) | 2003-07-31 | 2003-07-31 | Objective lens driver and optical disk system |
| JP204227/2003 | 2003-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1581315A CN1581315A (en) | 2005-02-16 |
| CN1311446C true CN1311446C (en) | 2007-04-18 |
Family
ID=34263289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100476692A Expired - Fee Related CN1311446C (en) | 2003-07-31 | 2004-05-28 | Objective driving device and optical disc device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005050414A (en) |
| CN (1) | CN1311446C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4537309B2 (en) | 2005-03-29 | 2010-09-01 | 富士通株式会社 | Optical pickup |
| CN100401399C (en) * | 2005-03-29 | 2008-07-09 | 富士通株式会社 | Optical pickup |
| JP4564944B2 (en) | 2006-08-08 | 2010-10-20 | 株式会社日立メディアエレクトロニクス | Optical pickup |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10162417A (en) * | 1996-11-27 | 1998-06-19 | Mitsumi Electric Co Ltd | Optical pickup |
| JPH11191236A (en) * | 1997-10-06 | 1999-07-13 | Toshiba Corp | Objective lens driving device |
| JPH11238262A (en) * | 1998-02-23 | 1999-08-31 | Ricoh Co Ltd | Manufacture of optical disk |
| CN1379401A (en) * | 2001-04-12 | 2002-11-13 | 三星电子株式会社 | Light collecting device and method of installing said light collecting device |
-
2003
- 2003-07-31 JP JP2003204227A patent/JP2005050414A/en active Pending
-
2004
- 2004-05-28 CN CNB2004100476692A patent/CN1311446C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10162417A (en) * | 1996-11-27 | 1998-06-19 | Mitsumi Electric Co Ltd | Optical pickup |
| JPH11191236A (en) * | 1997-10-06 | 1999-07-13 | Toshiba Corp | Objective lens driving device |
| JPH11238262A (en) * | 1998-02-23 | 1999-08-31 | Ricoh Co Ltd | Manufacture of optical disk |
| CN1379401A (en) * | 2001-04-12 | 2002-11-13 | 三星电子株式会社 | Light collecting device and method of installing said light collecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005050414A (en) | 2005-02-24 |
| CN1581315A (en) | 2005-02-16 |
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Address after: Tokyo, Japan Co-patentee after: Hitachi Audio-visual Media Co., Ltd. Patentee after: Hitachi Ltd. Address before: Tokyo, Japan Co-patentee before: Hitachi electronic audio-visual media Patentee before: Hitachi Ltd. |
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Granted publication date: 20070418 Termination date: 20130528 |