CN1713284A - Driver of optical pickup - Google Patents
Driver of optical pickup Download PDFInfo
- Publication number
- CN1713284A CN1713284A CN 200410025364 CN200410025364A CN1713284A CN 1713284 A CN1713284 A CN 1713284A CN 200410025364 CN200410025364 CN 200410025364 CN 200410025364 A CN200410025364 A CN 200410025364A CN 1713284 A CN1713284 A CN 1713284A
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- spring
- light picker
- tracking servo
- drive unit
- lens carrier
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Abstract
A driving device of light pickup consists of lens support; movable unit including a pair of tilt and focus coils, servo coil, magnetic yoke and fixed PCB; supporting unit including spring and damping frame. The invented device points center of elastic constant on driving center of tracking servo coil so shaking of lens support can be avoided when device is operated under resonant condition.
Description
(1) technical field
The invention relates to the light picker drive unit, refer in particular to about a kind of light picker drive unit of the inclination composition that produces when being controlled at resonance operation is arranged in drive installation in the middle of pair driver of the lens carrier of thing lens.
(2) background technology
Recently, along with the development rapidly of disk medium, read on the CD canned data and constantly developed with drive unit at the light picker of cd-rom recording of information.
Light picker generally will be installed on the lens carrier the thing lens with drive unit, when the upper and lower, left and right direction moves the said lens support, carry out the focusing operation/tracking operation of said lens.Carry out the upper and lower, left and right direction and move in the common magnetic field space that constitutes of magnet and yoke in order to drive the said lens support, focusing coil and tracking coil are set, utilize Lorentz force to come mobile said lens support according to the Fu Laiming lefft-hand rule.
Fig. 1 a and Fig. 1 b are the structural plan sketch map and the front sketch map of two axial brake devices used of existing light picker.
With reference to Fig. 1 a and Fig. 1 b, existing light picker comprises with drive unit: the lens carrier 13 to thing lens 11 is installed, magnet 15, yoke 17, tracking coil 19, focusing coil 21, spring 23, fixedly PCB25 and damping support 27.
To be elaborated to this below.Existing light picker is with being provided with lens carrier 13 in the drive unit, this support can move by a plurality of springs, and lens carrier 13 is provided with thing lens 11.That is, the center of said lens support 13 is provided with thing lens 11, is wound with focusing coil 21 around this lens carrier 13, and the dimetric tracking coil 19 that has wound line is installed then at an upper portion thereof.The both sides that tracking coil 19 and focusing coil 21 are not installed of said lens support 13 are provided with fixedly PCB25.Fixing spring 23 on the definite part of said fixing PCB25, and above-mentioned spring 23 is connected on the dampening bracket 27.In addition, on the symmetrical position of said lens support 13 yoke 17 is set, yoke 17 is fixed on the light picker substrate, is the front ends that are fixed on above-mentioned yoke 17 and apply magnet 15 that magnetic force produces electromagnetic force for tracking coil 19 and focusing coil 21.
Below, will be elaborated to the operation of existing light picker with above-mentioned formation with drive unit.
If carry electric current to the focusing coil 21 that places magnetic field, will produce electromagnetic force in the above-mentioned focusing coil.This electromagnetic force drives along upper and lower moving part (lens carrier 13 combinations) to (focus direction among Fig. 1 b).Identical, if carry electric current to tracking coil 19, moving part will move along left and right direction (tracking direction among Fig. 1 a).
According to aforesaid operations, the CD reflection face that records signal just can maintain in the depth of focus of the laser that the thing lens are penetrated, thereby can carry out the tracking servo operation of CD.
But, the high capacity requirement of the medium-CD that writes down and play along with information recently, the densification of CD is carried out.Corresponding to such high density compact disc, for the recorded information that can read this type of CD or read information on this type of CD, the light beam (hot spot) that just needs will gather on the CD diminishes.Like this for hot spot being diminished, just need short wavelength's laser and have large aperture (NumericalAperture) to the thing lens.
The diameter of general hot spot is to calculate by following mathematical expression 1.
The diameter of hot spot=0.82* λ/N.A.
The spot diameter that above-mentioned mathematical expression 1 occurs is directly proportional with wavelength (λ), and (N.A.) is inversely proportional to the aperture, so, just need to shorten wavelength (λ) and amplify aperture number in order to dwindle spot diameter.
In addition, the tilt tolerance of the control device of disc drives (Tilt Margin: be restricted by the characteristic of the inscape of optical instrument the ability that allows the inclination composition).Tilt tolerance is calculated by following mathematical expression 2.
[mathematical expression 2]
Tilt tolerance ∝ λ/N.A.
3
As implied above, tilt tolerance is directly proportional with wavelength, is inversely proportional to 3 powers of aperture value.
CD density is high more, and tilt tolerance is just more little.So little tilt tolerance will produce because the mortality influence of the control device that the crooked or mechanical race of CD causes from (run out).
Therefore, for the stable servo operation in the middle of the driver of realizing record/broadcast high density compact disc, just need drive unit (actuator) to follow the trail of the inclination composition of CD.
Therefore, a lot of researchists begin to be devoted to the research and development to the drive unit (actuator) of the inclination composition that can follow the trail of CD.
With reference to Fig. 2 an embodiment in this is described below.
Fig. 2 a is the structural drawing of existing light picker with triaxial driving apparatus.Fig. 2 b is the ordered state figure of existing light picker with the magnetic loop of triaxial driving apparatus.
With reference to Fig. 2 a and Fig. 2 b, existing light picker comprises with triaxial driving apparatus: the lens carrier 33 to thing lens 31 is installed, magnet 35, yoke 37, tracking servo coils 39, inclination dual-purpose focusing coil 41, spring 43a, 43b, 43c, fixedly PCB45 and damping support 47.
To be elaborated to this below.Existing light picker is provided with pair of angled dual-purpose focusing coil 41 with drive unit about the front of lens carrier 33.Between above-mentioned pair of angled dual-purpose focusing coil 41, tracking servo coils 39 is set.Here, it should be noted that the above-mentioned pair of angled dual-purpose of the ratio focusing coil 41 that above-mentioned tracking servo coils 39 will be provided with is higher relatively.
Generally, need be arranged on the top inner face of lens carrier 33, and give prominence to a part forward thing lens 31.Like this, the mass centre of said lens support 33 definite part that moved up from the center of lens carrier.
Like this, when tracking servo coils 39 is set, need the driving center of above-mentioned tracking servo coils 39 consistent with the mass centre of said lens support 33.
If the inconsistent words of mass centre of the driving center of above-mentioned tracking servo coils 39 and said lens support 33, lens carrier the swag phenomenon of relative central shaft will occur when carrying out resonance operation.This rocking (ROLLING) phenomenon will cause the generation of other resonant frequency, thereby control performance is caused fatal influence.
Therefore, the mass centre of said lens support 33 needs consistent with the center of tracking coil 39, just can not produce swag phenomenon like this when resonance operation, thereby can guarantee stable servo operation.In addition, the driving center of above-mentioned mass centre and above-mentioned tracking servo coils 39 is consistent, can prevent that also radius that the inertia to spring and movable member (parts of lens carrier 33) causes from rocking the influence of the vibration of pattern.
In addition, with above-mentioned coil (tracking servo coils 39, the inclination dual-purpose focusing coil 41) yoke 37 that is provided with spaced apart.The front end of above-mentioned yoke 37 is provided with magnet 35.Here, above-mentioned magnet 35 also can use one and have dipolar magnet, not so, also homopolar magnet can be used in combination.In addition, for can be more effective, the following edge lengths of above-mentioned inclination dual-purpose focusing coil 41 also can be provided with the corresponding position of lower length that be above-mentioned inclination dual-purpose focusing coil 41 with yoke 49.
The fixedly PCB45 that the two sides of said lens support 33 are provided with goes up each side 3 spring 43a, 43b, 43c is set.Above-mentioned spring 43a, 43b, 43c are fixed on the above-mentioned dampening bracket 47, are used for supporting said lens support 33.
At this moment, above-mentioned three spring 43a, the 43b, the 43c that are arranged between said fixing PCB45 and the above-mentioned dampening bracket 47 keep certain intervals, and be arranged in parallel (Fig. 3).Here, in the spring that connects between said fixing PCB45 and the above-mentioned dampening bracket 47, upper-lower position is tracking spring and focusing spring 43a, 43c, and the above-mentioned tracking spring that is arranged on upper-lower position is used spring 43b with focusing on being connected in the middle of spring 43a, the 43c to tilt to monitor.
Like this, three spring 43a, 43b, 43c are according to after uniformly-spaced being connected to said fixing PCB45 and going up, and the central point of the elastic constant (k) that above-mentioned spring 43a, 43b, 43c form is located in the middle position of said lens support 33.But, the setting that is inclined upwardly from the driving center of above-mentioned tracking servo coils 39, on the contrary, the central point of elastic constant (k) that is fixed on spring 43a, 43b, the 43c of said fixing PCB45 is positioned at the central authorities of said lens support 33, therefore, during resonance operation,, therefore will produce rotation along with moving of said lens support 33 will produce the inclination composition.That is, the central point of the elastic constant of spring 43a, 43b, 43c (k) must be consistent with the driving center of tracking servo coils 39, can not produce the inclination composition when resonance operation, thereby can guarantee stable resonance operation.
Therefore, need drive by resonance operation under the situation of said lens support 33, the words that said lens support 33 rocks, will cause to see through the above-mentioned laser beam that thing lens 31 are penetrated and can not shine the position that needs on the CD accurately, thus can not be accurately from the optical disk reading breath of winning the confidence.
Therefore, just need a solution realize the connection of spring, thus the inclination composition that spring produces with the parallel connection of identical distance can control owing to resonance operation the time.
(3) summary of the invention
The present invention proposes in order to address the above problem, and the object of the present invention is to provide a kind of light picker drive unit, the inclination composition that produces when being used for controlling resonance operation.
Another object of the present invention is to provide the spring method of attachment of a kind of light picker with drive unit, utilizes three drivings to control the generation of inclination composition with spring at light picker in drive unit.
To achieve these goals, the light picker of the present invention embodiment of drive unit is characterized in that comprising:
Lensed lens carrier is installed; Movable device, about the two sides of described lens carrier, pair of angled dual-purpose focusing coil is set, and between the described pair of angled dual-purpose focusing coil therefrom on the mind-set a distance tracking servo coils is set, on relative position, the front of described pair of angled dual-purpose focusing coil and tracking servo coils, yoke is set, be used for producing the magnet of magnetic force in the medial surface setting of described yoke, on the certain position of the other both sides of described lens carrier, fixedly PCB is set, forms movable device; Supportive device, be used for realizing that an end of three shaft-driven springs is respectively fixed to described fixedly PCB, and make one in the middle of being positioned in the described spring to be obliquely installed, the other end of described spring is affixed on the dampening bracket respectively, and dampening bracket just is being arranged on the described supportive device.
Here, the spring that is positioned at described centre also can be parallel with superposed spring and near its setting.
The spring of She Zhiing like this, the central point of elastic constant will be consistent with the driving center of tracking servo coils.In addition, the central point of above-mentioned elastic constant can pass through pitch angle (θ), and at least more than one is adjusted in the point of fixity of spring thickness (Φ) or spring.
Light picker in the middle of an alternative embodiment of the invention is with in the spring method of attachment of drive unit, and spring comprises the focus servo spring, and tracking servo is used spring and tilted the monitoring spring.Described focus servo is set at the upper-lower position of described fixedly PCB with spring and tracking servo with spring, and with being provided with the monitoring spring between the spring, monitor with spring to being obliquely installed by described inclination with spring and tracking servo for described focus servo.
Here, described inclination monitoring is set at apart near the described fixedly PCB the superposed spring with spring, simultaneously can be the closer to described dampening bracket side more to lower tilt.
With in the spring method of attachment of drive unit, spring comprises the focus servo spring according to the light picker in the middle of the embodiments of the invention, and tracking servo is used spring and tilted the monitoring spring.Described focus servo is set at the upper-lower position of described fixedly PCB with spring with spring and tracking servo, described focus servo is used spring with spring and tracking servo with being provided with between the spring to tilt to monitor, described inclination monitoring uses spring near superposed spring, and in parallel.
Effect of the present invention:
Have above-mentioned formation and carry out the light picker drive unit of the present invention of operation as mentioned above, be obliquely installed the monitoring spring, the central point of elastic constant is consistent with the driving center of tracking servo coils, thereby can limit the inclination composition, thereby realize horizontal stable ground mobile lens support.
In addition, when being obliquely installed above-mentioned inclination monitoring with spring, there is certain distance in the side that the inclination that is fixed on dampening bracket is monitored with spring with the spring that is arranged on top, thereby can prevent to occur when carrying out welding operation unworkable problem.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 a and Fig. 1 b are structural plan sketch map and the front sketch map of existing light picker with two axial brake devices;
Fig. 2 a is the structural drawing of existing light picker with triaxial driving apparatus;
Fig. 2 b is the ordered state figure of existing light picker with the magnetic loop of triaxial driving apparatus;
Fig. 3 is provided with view for existing light picker with the coil of triaxial driving apparatus;
Fig. 4 is the spring method of attachment key diagram of the light picker in the middle of the embodiment of the invention in the drive unit;
Fig. 5 is the spring method of attachment key diagram of the light picker of another one embodiment of the present invention with triaxial driving apparatus.
(5) embodiment
Below with reference to accompanying drawings the embodiment of light picker of the present invention with drive unit is elaborated.
Fig. 4 is the spring method of attachment key diagram of the light picker in the middle of the embodiment of the invention in the drive unit.Three light pickers of the present invention with the formation critical piece of drive unit with that the position relation is set is identical with Fig. 2, so below will omit explanation to component parts.
Light picker of the present invention is with in the triaxial driving apparatus because the thing lens are installed in the top of lens carrier, so light picker of the present invention with the mass centre of triaxial driving apparatus above the center of lens carrier moves on to.Therefore, during resonance operation, lens carrier will produce and rock (rolling) phenomenon.In order to prevent the generation of above-mentioned swag phenomenon, need the driving center of tracking servo coils is consistent with mass centre.Like this, light picker triaxial driving apparatus of the present invention, in the two sides of lens carrier, the tracking servo coils setting that is arranged between the pair of angled monitoring dual-purpose focus servo coil must be than above-mentioned pair of angled monitoring dual-purpose focus servo coil height.The tracking servo coils of She Zhiing just can be consistent with the mass centre of its driving center and lens carrier like this, thereby can prevent the swag phenomenon of the lens carrier that produces when resonance operation.
In addition, in the middle of the prior art, being arranged on light picker is to keep the same intervals secured in parallel on the fixing PCB with three springs of triaxial driving apparatus.Generally, the tracking servo in three springs is arranged on the upper-lower position of said fixing PCB with spring with spring and focus servo, and the monitoring of tilting is arranged between tracking servo spring and the focus servo spring with spring.Here, one in tracking servo spring and the focus servo spring is arranged on top, and another one is arranged on the bottom, with this sequence independence.
Like this, if three springs be arranged in parallel with identical distance, the central point of the elastic constant that above-mentioned spring forms is positioned at the central authorities of lens carrier, thus during resonance operation along with moving of lens carrier will produce the inclination composition, and then lens carrier will carry out incorrect rocking.
In order to prevent such inclination composition in advance, above-mentioned pair of angled monitoring should be the driving center consistent location of tracking servo coils with the setting of spring.
As previously mentioned, light picker of the present invention, is arranged on tracking servo coils on the lens carrier central authorities definite part in order to make the driving center of the mass centre of lens carrier and tracking servo coils consistent with triaxial driving apparatus.
Like this, upwards rising along with the driving center of tracking servo coils from lens carrier central authorities, for can the elastic constant of the driving center of above-mentioned tracking servo coils and spring is consistent, as shown in Figure 4, preferably can will tilt to monitor with the spring 63 close springs 61 that are arranged on top, and setting in parallel.
As shown in Figure 4, because the monitoring of will tilting with spring 63 near the springs 61 that are arranged on top, so just can allow the central point of elastic constant of three springs 61,63,65 from the mediad rising of lens carrier.
Like this because the monitoring of will tilting with spring 63 near the springs 61 that are arranged on top, so, even resonance operation drive lens carrier can the run-off the straight composition yet, so just can keep lens carrier not rock, and the level of just keeping moves.
In addition, as shown in Figure 4, to tilt to monitor near the springs 61 that are arranged on top with spring 63, and words horizontally disposed with it, during resonance operation, though can move horizontally lens carrier, when but the monitoring of will tilting is combined on the dampening bracket 69 with spring 63, with the interval of the spring 61 that is arranged on top will very little (seeing shown in the A position among Fig. 4), so just be difficult to carry out welding operation, thereby will produce the low problem of productibility, the B among Fig. 4 is the other end fixed position of monitoring with spring 63 that tilt.
With reference to Fig. 5 the method for head it off is described below.
Fig. 5 is the spring method of attachment key diagram of the light picker of another one embodiment of the present invention with 3 axial brake devices.
Light picker drive unit of the present invention comprises: lens carrier is equipped with lens; Movable device, about the two sides of described lens carrier, pair of angled dual-purpose focusing coil respectively is set, and between the described pair of angled dual-purpose focusing coil therefrom on the mind-set a distance tracking servo coils is set, on relative position, the front of described pair of angled dual-purpose focusing coil and tracking servo coils, yoke is set, be used for producing the magnet of magnetic force in the medial surface setting of described yoke, on the certain position of the other both sides of described lens carrier, fixedly PCB68 be set; Supportive device, be used for realizing that an end of three shaft-driven springs 61,65,67 is respectively fixed to described fixedly PCB68, and make the middle spring 67 that is positioned in the described spring be obliquely installed, the other end of described spring is affixed to respectively on the dampening bracket 69 that is arranged on the supportive device.
A spring that is obliquely installed 67 in the middle of described being positioned at is set near the described fixedly PCB68 of the superposed spring of distance, simultaneously can be the closer to described dampening bracket 69 sides more to lower tilt.
Below said structure of the present invention is elaborated.
As shown in Figure 5, if be obliquely installed monitoring, will prevent the low problem of productibility that when carrying out welding operation, produces with spring 67.
Promptly, to be fixed on inclination monitoring on the fixing PCB68 with the close spring 61 (the B position among Fig. 5) that is arranged on top of a side of spring 67, the monitoring of will tilting then is obliquely installed with spring 67, the spring 61 that the inclination monitoring that is fixed on dampening bracket 69 was arranged on and was arranged at top with the other side of spring 67 keeps on the fulcrum of certain intervals (seeing shown in the A position among Fig. 5), and the spring 67 in the middle of described being positioned at is grown than other spring 61,65.
Be fixed on above-mentioned dampening bracket 69 spring 61,65,67 be provided with best equally with prior art, be provided with according to identical distance.Certainly, even being fixed on the spring 61,65,67 of above-mentioned dampening bracket 69 is provided with not according to identical distance, the monitoring of tilting needs only when carrying out welding operation with spring 67, keep certain interval with above-mentioned spring 61, it is just passable not exert an influence, that is, the position of the described spring that is positioned at above-mentioned centre is provided with, and makes that the driving center of the central point of elastic constant and described tracking servo coils is consistent.
Be arranged near spring 61 the driving centers on top for the tracking servo coils consistent with the mass centre of described lens carrier
As mentioned above, because tilt to monitor with spring 67 (middle spring) near the spring 61 that is arranged on top, so the driving center of the central point of elastic constant and tracking servo coils is consistent.
Certainly, the pitch angle (θ) of spring 67 is used in an inclination monitoring that is obliquely installed in the middle of utilizing, in the point of fixity of spring thickness (Φ) or spring at least one (promptly, A, B point), adjust elastic constant K, thereby can make the driving center of the central point of elastic constant and tracking servo coils consistent simply accurately.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (6)
1, a kind of light picker drive unit is characterized in that comprising:
Lens carrier is equipped with lens;
Movable device, about the two sides of described lens carrier, pair of angled dual-purpose focusing coil respectively is set, and between the described pair of angled dual-purpose focusing coil therefrom on the mind-set a distance tracking servo coils is set, on relative position, the front of described pair of angled dual-purpose focusing coil and tracking servo coils, yoke is set, be used for producing the magnet of magnetic force in the medial surface setting of described yoke, on the certain position of the other both sides of described lens carrier, fixedly PCB be set;
Supportive device, be used for realizing that an end of three shaft-driven springs is respectively fixed to described fixedly PCB, and make one in the middle of being positioned in the described spring to be obliquely installed, the other end of described spring is affixed to respectively on the dampening bracket that is arranged on the supportive device.
2, light picker drive unit as claimed in claim 1 is characterized in that:
Spring in the middle of described being positioned at is the monitoring spring that tilts.
3, light picker drive unit as claimed in claim 1 is characterized in that:
Spring in the middle of described being positioned at is longer than other described two springs, and is fixed on the described fixedly PCB.
4, light picker drive unit as claimed in claim 3 is characterized in that:
The position of described spring in the middle of being positioned at is provided with, and makes that the driving center of the central point of elastic constant and described tracking servo coils is consistent.
5, light picker drive unit as claimed in claim 4 is characterized in that:
The central point of described above-mentioned elastic constant can be by the pitch angle of the spring in the middle of described being positioned at, and at least more than one is adjusted in the point of fixity of spring thickness or spring.
6, light picker drive unit as claimed in claim 1 is characterized in that:
Described tracking servo coils the position is set, make that the mass centre of the driving center of tracking servo coils and described lens carrier is consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025364 CN1713284A (en) | 2004-06-23 | 2004-06-23 | Driver of optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025364 CN1713284A (en) | 2004-06-23 | 2004-06-23 | Driver of optical pickup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1713284A true CN1713284A (en) | 2005-12-28 |
Family
ID=35718857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410025364 Pending CN1713284A (en) | 2004-06-23 | 2004-06-23 | Driver of optical pickup |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1713284A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388226B (en) * | 2007-09-14 | 2012-01-11 | 索尼株式会社 | Optical pickup device and disk driving device |
-
2004
- 2004-06-23 CN CN 200410025364 patent/CN1713284A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388226B (en) * | 2007-09-14 | 2012-01-11 | 索尼株式会社 | Optical pickup device and disk driving device |
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